Product Design & Development

Cam And Follower Mechanisms | 10 Unconventional Knowledge About Cam And Follower That You Can’t Learn From Books.

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 12:26:00 +0000

What is the purpose of a cam and follower?

Cam and follower mechanisms are profiled shapes that are placed on a shaft and are responsible for the movement of a lever or follower. In order to transform rotational motion into linear (reciprocating) motion, cams are employed. The follower rises and falls in response to the rotation of the cam, which is referred to as reciprocating motion

When two links are linked together either along a line or at a point, the connection is referred to as a higher pair. A whole cam and follower system will be comprised of two upper pair devices of this kind. A higher pair mechanism is referred to as a cam and follower mechanism.

Because the smooth operation of a cam and follower mechanism is critical to its efficiency, it is critical that the follower move smoothly without needing excessive input power, which implies that the follower should not jam during its movement.

What does a cam and follower look like in practice?

A cam and follower is an integral part of a cam. Despite the fact that cams may be found in a variety of applications (dishwashers, sprinklers, and so on), the most well-known is the camshaft used in automobiles. In order to transform rotational motion into linear motion, a cam must be used.

All of these timing actions may be readily set by using cam and follower mechanisms in an IC engine since the valves must be maintained open at first, then closed and remained closed. As an example, we may look at planar links, two-dimensional linkages, and other types of connections.

What is the difference between the cam and the follower?

Cams are reciprocating, oscillating, or rotating bodies that are in touch with another body, known as the follower, and which impart reciprocating or oscillating motion to the follower while in contact with it. Because of the cam's own motion, the necessary motion of the follower, and the form of the contact face of the follower, the shape of the cam is determined by these factors.

Then we'll talk about the many kinds of Cam.

CAMs are classified into the following categories:

There are many different kinds of cams available, which are mentioned below:

• Disc or Plate Cam

• Cylindrical Cam

• Translating Cam

• Radial Cam

• Wedge Cam

• Spiral cam

• Heart shaped cam

• Conjugate cam

• Globoidal cam

• Spherical cam

Disc or Plate Cam:

An axial disc or plate cam is a kind of cam in which the follower travels radially outward from the cam's rotational center, as opposed to a radial plate cam. These cams are very popular because of their simple design and small size, which allows them to be installed in distant locations. Disc or Plate Cams are used in IC engines and machine tools, to name a few examples.

In order to give a particular motion to the follower, the disc (or plate) cam is designed with an uneven shape. The follower spins on a plane that travels in the direction of the camshafts axis of rotation, and it is held in touch with the cam by either springs or gravity.

Cylindrical Cam

A cylindrical cam is a kind of cam in which the cylinder rotates around its axis and has a circumferential groove contour carved into the surface of the cylindrical body during the rotation process of the cylinder. They are also classified into two types: the first kind has a circumferential groove carved into the surface of the cam and the roller, and it has a positive oscillating action which is parallel to the axis of rotation of the cylinder. As in the second type, a cylindrical surface may be used as a working surface. When using this kind of cam, the follower is spring-loaded and moves along the parallel axis with the spinning cylinder.

Translating Cam

The kind of cam in which the cam may move in a horizontal plane is made up of a curved plate with grooves or contours that slides on a guiding surface is known as a translating cam. The follower should oscillate or reciprocate is also connected, and the motion of the follower is restricted with the aid of the spring. Groove or contour cams, in which the follower motion is accomplished without the need of a spring, are often employed.

Radial Cam:

This is a cam that rotates along a radial axis. If the input link, also known as the cam, rotates as angular motion, then the cam has rotational or angular motion, and we refer to it as a radial cam.

The cam is the name given to this profiled body. A revolute pair connects the foundation to the fixed link, which is also known as the fixed link. Cam is the pivotal link in the chain. The fixed link and cam are connected by a revolute pair, and the follower is connected to the output link via the follower. If this cam rotates in accordance with the profile or form of the cam, the follower will experience translatory motion in conjunction with this prismatic pair between the fixed link and the follower, as shown in the illustration.

As a result, the oscillation of the follower and guide will be caused by the uniform rotational motion of this cam.

Wedge Cam:

If the cam moves in a linear way, it is referred to as a wedge cam. The wedge cam features a four-link system, the first of which is the fixed link, and the other of which is the cam that looks like a wedge. According to the profile of this wedge, when this cam oscillates in the horizontal direction, the follower will oscillate in the vertical direction, along with this prismatic pair or this guide, depending on the configuration of this wedge.

The wedge cam has an inclined flat regular shape that imparts a particular motion to the follower when it is in the closed position.

Spiral Cam:

When the spiral cam is used to form the Grooved contour, it comprises of a semicircular or a spiral that travels in a reciprocating motion while the follower moves perpendicular to the cam's axis.

Cam with a heart-shape:

This kind of cam has the appearance of an asymmetric heart. It is mostly used to return a shaft to a predetermined position in order to keep the cam in that place due to the pressure exerted by a roller.

Conjugate Cam:

A cam profile is formed by connecting two discs to each other and shifting the axes of the discs apart by a predetermined distance from one another. Two rollers on the follower make surface contact with the cam profile of the follower. As the cam spins, followers move in lockstep with it.

Globoidal Cams:

A globoidal cam is a shaft with a circumference that is either concave or convex. A groove is created by machining on the surface of the follower, and this groove is used to provide movement to the follower. An oscillating follower around a fixed point is achieved using a globoidal cam.

What is the definition of a Follower?

A follower is a mechanical component that moves in the same direction as the cam. It may be either translating or oscillating. It may be in contact with the cam's surface profile or it might be spring-loaded. It may move with uniform velocity or with uniform acceleration motion, depending on the situation. With the assistance of the follower motion, it is possible to create complicated output motion.

Followers may be classified into the following categories:

There are many distinct types of surface contact between the cam and follower, and they are categorized as follows based on the kind of surface contact:

• Movement-based follower types

• Shape-based follower types

• Follower types based on movement direction

Movement-based follower types

The relative motion and movement between the cam and follower are categorized as follows.

1) Translatory Motion

Translational motion is achieved by the follower in this case, meaning that the cam is rotating and the follower reciprocates between the guide ways. Followers of this kind include the knife edge follower, the roller follower, the flat follower, and the spherical follower, to name a few examples.

2) Oscillatory Motion

When using this kind of follower, the follower moves in an oscillating manner. The cam rotates, and the follower moves in accordance with the cam profile, but the follower is fixed at the position around which the follower oscillates. The oscillatory motion type follower is the name given to this kind of follower.

Shape-based follower types

The following are the four distinct kinds of followers:

Linear followers
Oscillating followers
Knife edge followers
Roller followers
Followers with a flat face or a mushroom form
Followers with a spherical face

Linear follower

It is known as a translating follower if the follower moves linearly rather than angularly. When it comes to the translating follower, which is defined as the axis of that prismatic pair passing through the cam center, we refer to it as radially translating follower. When the follower axis crosses through the center of the camshaft, the follower is referred to as a radial translating follower. The term "offset translating follower" refers to the fact that the axis of the translation of the follower does not cross through the center of the cam.

Oscillating follower

The cam continues to spin in the same manner as previously, but because of the form of the cam, the follower experiences oscillatory motion, and the follower is hinged at the place where the cam is hinged. As a result, this is referred to as an oscillating follower.

Knife-edge follower

If the follower only has a knife-edge contact with the cam, it is referred as as a knife-edge follower. Because of the very high wear rate, the knife-edge is merely theoretical due to the fact that the knife-edge follower is never utilized. There will be a great deal of contact stress. This kind of follower makes direct touch with the cam and has a sharp contact area. T hese types of followers are not often used in the event of rapid application.

Roller follower

When a follower is hinged to a roller, and the roller comes into contact with the cam, the follower is known as a roller follower. This is the cam that rotates, and the follower that is hinged here oscillates in response to the rotation of the cam. It is used when a significant amount of force must be transferred, such as in stationary IC engines.

There must be sufficient space to accommodate a large roller because the pin must be large enough to transmit the force between the cam and the follower and the roller must be at least twice as large as the pin. If there is insufficient space for a large roller, the pin must be made substantially larger than the roller.

Because it makes a smooth touch with the surface, this kind of follower is mostly used in high-speed operations. When compared to the other types of followers, this kind of follower experiences less wear and tear.

Flat face follower:

The flat face follower is the name given to the follower surface that comes into contact with the cam and is in the shape of a flat surface. As an alternative to a flat surface, the follower surface may alternatively have a curved shape. Because it is the cam that rotates and the follower that is hinged here that oscillates, this is referred to as curved-face motion. Using a flat face follower, assuming space is limited and the force involved is not too great (like in the case of cars), may be an effective solution.

This kind of follower has the appearance of a flat surface with an uneven cam, as seen in the illustration. This kind of cam is utilized when there is a limited amount of space available and the follower must withstand greater side thrust. It is also possible to utilize this follower in a critical situation.

Spherical Follower

This kind of follower features a bent yet normal follower, as well as a cam, which makes it quite versatile. This is a variation on the flat-faced follower design.

Follower types based on movement direction

1) Radial Follower

A follower with a center line of movement is one that is located directly in the middle of the camshaft. The majority of the time, the follower's movement is in sync with the leader. The follower is in the midst of a reciprocating movement.

2) Offset Follower

If you have this kind of follower, the movement of the follower's axis is not colinear with the movement of the cam axis.

Nomenclature for the Cam and Follower:

The following is the terminology used in the context of Cam and Follower:

• Trace Point

• Base Circle

• Prime Circle

• Pitch Curve

• Pressure Angle

Trace point:

A trace point is a point on the follower that is used to explain the movement of the follower. It is the center of the roller in the case of a roller follower. In this case, the trace point is the roller centre, which implies that the follower's movement will be described in terms of the motion of the roller center.

We utilize the tracepoint of a flat face follower when the follower is at one of the extreme positions, when follower is nearest to the cam center. If the follower has a curved face, we use the tracepoint of a point on the follower's face that is in contact with the cam surface when the follower has a flat face.

Base circle

We refer to this circle as a base circle because it's the smallest circle that can be formed with the cam center as the center and contacting the cam profile; this circle is the smallest of all the circles that can be drawn. As a result, the radius of the base circle we designate Rb is referred to as the base circle radius.

Pitch curve

Consider the concept of kinematic inversion while defining the pitch curve. This is a four bar-link mechanism, consisting of a fixed link, a cam, a roller, and a follower, as seen in the kinematic inversion.

This link is fixed in this four-link mechanism, however it is not fixed in the kinematic chain if we do a kinematic inversion while keeping the cam fixed. If the location of the center of the roller is parallel to the cam profile, a curve will be generated by the roller.

After kinematic inversion with the cam fixed, this is the location of the trace point or roller center, as shown in the diagram.

Prime circle

A prime circle is the smallest circle that can be formed with the cam center as the center and with the pitch curve as the tangent to it. The center of this circle is located on the camshaft axis and it is tangential to the pitch curve. This circle is referred to as the prime circle. If the base circle radius is Rb and the roller radius is Rr, then the prime circle radius is Rp = Rb + Rr.

Pressure angle:

The global normal between the roller and the cam passes through the center of the roller and is perpendicular to the cam profile.

Assuming we ignore friction, the force that the cam puts on the rollers is in the direction of this standard normal. This is the direction of force between the cam and roller when there is no friction between these two components. However, since the roller is being pushed in this way in the vertical plane, the angle should not be too great. So the pressure angle is defined as the angle between these two directions, which is the normal contact force and the direction of the follower movement. This angle is represented by the symbol "φ".

Obviously, in order to ensure smooth movement of the follower, the maximum value of φmax should be smaller than the φ value that is permitted. The value of φ varies based on the cam profile, and for a translating roller follower, the maximum value of φ should be less than 30 in most instances. While resisting the spring force, the pressure angle should be kept as low as possible, and this positive offset guarantees that the pressure angle decreases during the motion. While the follower is going down, it compresses the spring and increases the force applied to it.

Working Principle of the Cam and Follower:

A normal force acts in the X direction, and a normal force acts in the Y direction, and the cocking moment, which is the moment owing to this force Fn, is balanced by these two normal forces.

Because of this vertical motion, the friction force that will attempt to resist it will be three times the usual force. If we consider the normal force to be N, then this friction force will be μN. In order for the follower to go higher, it must not only resist these two friction forces, but it must also overcome the spring force.

It is necessary to have a large Fn in order to overcome the friction force, and the vertical component of the Fn will overcome both of these friction forces as well as the spring force. However, when the follower is moving downward, the spring force assists the follower in coming down, resulting in a smaller contact force.

In this case, Fn cos φ will be the vertical component, and if the value of φ is extremely high, then the vertical component will be decreased. Therefore, during the the upward movement, the pressure angle should be modest, while during the return movement, φ may be big, making φmax more important during the uphill movement than during the return movement.

When constructing a cam and follower system, it is important to ensure that the translating follower does not jam in the prismatic guide. The likelihood of the oscillating follower's movement being restricted is greatly reduced.

Benefits of Cam and Follower

There are many benefits to using a cam and follower.

• Cam and follower bearing are that they always distribute evenly, regardless of the configuration of the unit.

• When it comes to linear movements, cams and followers provide a broad variety of options.

• Cam and followers have the ability to absorb more stress than usual while also reducing distortion.

• They are very flexible.

• Cam and followers have the ability to absorb more stress than usual while also reducing distortion.

Disadvantages of using a cam and follower:

The following are some of the drawbacks of using Cam and Follower:

• The backlash between the cam and follower and the cam is measured in microns.

• This must be halted immediately in order to avoid extensive damage in the case of a machine accident.

• More costly to produce and machine because of the higher level of accuracy required.

• It is not feasible to have a negative radius of curvature.

Application of a cam and follower:

The following are examples of CAM and FOLLOWER applications:

• The feed mechanism of a lathe machine is an important part of the machine.

• The inlet and exhaust valves of an IC engine are have cam and follower.

• These are utilized in the manufacture of wall clocks.

• These are used in the automated lathe machine's feed mechanism.

• Screw machines and other items of equipment together.

• Gear-Cutting Machineries are a kind of machine that cuts gears.

• In printing machinery, this device aids in the printing process by assisting the screen. The push aids in obtaining the location in which the printing will take place, and the pull aids in printing on that position.

• The primary mechanism in hydraulic systems is the piston.

• The Cam and Follower mechanism, which is also found in textile types of equipment, aids in the stitching of clothing by a push and pull to move.

• In this instance, the mechanism is reliant on the fluid pressure. Different types of equipment, such as cams and followers, are used in the production of various components that are automated in motion.

FAQs in Cam and Follower

What exactly are the terms cam and follower?

What is a Cam Mechanism, and how does it work?

A cam is a revolving or sliding component that is part of a mechanical linkage that is used to convert rotational motion into linear motion, in particular. An eccentric wheel (for example, an eccentric shaft) is a revolving wheel or shaft that hits a lever at one or more places along its circular route, usually near the end of the wheel or shaft (for example, an irregular cylinder).

What is the Follower Mechanism, and how does it work?

Cam and follower mechanisms are profiled shapes that are placed on a shaft and are responsible for the movement of a lever or follower. In order to transform rotational motion into linear (reciprocating) motion, cams are employed. It is either via the force of gravity or a spring that the follower maintains contact with the cam.

What exactly is Cam?

A cam is a rotating device that, via direct contact with the follower, which is another part of this machine, provides oscillating or reciprocating motion to it.

What is the definition of a Follower?

A follower is a spinning or oscillating component of a machine that follows the motion of a cam by making direct contact with the cam itself.

What is the function of a cam and follower in your system?

The intake and exhaust valves of an I C engine are operated by a cam and a follower, which are both extensively utilized. These are utilized in the manufacture of wall clocks. All of them are used in the automated lathe Machine's feed mechanism. These are used in paper-cutting machines, among other things.

NVH Terms | NVH Terminology | Popular NVH Glossary List In 21st Century

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 12:17:00 +0000

NVH Terminology / NVH Glossary

NVH Terms is a term for the interpretation of vehicle noise, vibration and harshness contributing to varying degrees of discomfort what the people can hear and feel as they drive along, including wind noise, road noise, suspension bumps, engine vibrations.

Continuation is available in the following post:

NVH Terms | Popular NVH Terminology | NVH Glossary

Audible Range of Sound – NVH Terminology

Sounds that are in the range of 20 to 20,000 Hertz (Hz).

VH Terminology – Audible range of sound – Pitch intensity sound – Soundwaves – NVH noise level

Amplitude

The vertical measurement between the top and bottom of a wave. Also see magnitude.

Amplitude Sound Cycle – NVH Terminology

Vibration amplitude – Sound waves – Vibration level

Beat

An NVH concern produced by two sounds that is most noticeable when the frequency difference is 1 to 6 Hz.

Bead Seating

The process of seating the tire to the rim. If properly lubricated the bead seating occurs when the tire and wheel are assembled.

Compelling Force

A vibrating object acting upon another object that causes the other object to vibrate.

Cycle

The path a wave travels before the wave begins to repeat the path again.

Dampen

To reduce the magnitude of a noise or vibration.

Dampers

A component used to dampen a noise or vibration. Foam and rubber are commonly used to dampen vibrations.

Dynamic Balance

A procedure that balances a tire and wheel assembly in two planes. Dynamic balance removes radial and lateral vibrations.

Droning, High-Speed

A long duration, non-directional humming noise that is uncomfortable to the ears and has a range of 50 mph (80.5 kph) and up.

Droning, Low-Speed

A long duration, low-pitched noise that is non-directional and has a range of up to 30 mph (48 kph).

Droning, Middle-Speed

A long duration, low-pitched noise that is non-directional and has a range of 30 to 50 mph (48 to 80.5 kph).

Electronic Vibration Analyzer

An electronic NVH diagnostic tool that measures frequency and amplitude.

Frequency

The number of complete cycles that occurs in a given period of time.

Harshness

An aggressive suspension feel or lack of give in response to a single input.

Hertz

The unit of frequency measurement in seconds (a vibration occurring 8 times per second would be an 8 Hz vibration).

Hiss

Steady, high-frequency noise. Vacuum leak sound.

Hoot

A steady, low-frequency tone, sounds like blowing over a long neck bottle.

Howl

A mid-range frequency noise between drumming and whine. Also described as a hum.

Intensity

The physical quality of sound that relates to the amount and direction of the flow of acoustic energy at a given speed.

Lateral Run out

A condition where a rotating component does not rotate in a true plane. The component moves side-to-side (wobbles) on its rotational axis.

Magnitude (Amplitude) – NVH Terminology

The amount of force or the intensity of the vibration. The magnitude or strength of a vibration is always greatest at the point of resonance.

Medium

Provides a path for sound waves to travel through.

Natural Frequency

The frequency that a component will vibrate the easiest. Normally, the larger the mass, the lower its natural frequency.

Engine block (2-4 Hz)
Tire and wheel assemblies (1-15 Hz) – proportional to vehicle speed
Suspension (10-15 Hz
Driveline (20-60 Hz)
Differential components (120-300 Hz)

Noise

The unpleasant or unexpected sound created by a vibrating object.

Order

The number of disturbances created in one revolution of a component.

NVH | Noise Vibration And Harshness | NVH Basics | NVH Analysis | Noise Vibration And Harshness Introduction

Phase

The position of a vibration cycle relative to another vibration cycle in the same hertz rate (time frame).

NVH Terms | Popular NVH Terminology | NVH Glossary

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 12:15:00 +0000

NVH Terms / NVH (Noise, Vibration and Harshness) Terminology

NVH is the research and alteration of the noise and vibration characteristics of cars and trucks in particular. While it's simple to quantify noise and vibration, but harshness is a subjective attribute and is assessed by "bench" tests, or through analytical instruments that can yield results that match human sensations.

Part – 1 NVH Terminologies available in the following link. Check it.

NVH Terms | NVH Terminology | Popular NVH Glossary List In 21st Century

Pitch

The physical quality of sound that relates to the frequency of the wave.

Pitch – Belt Squeaking creates high frequency – Pitched noise roller bearing makes low frequency

Camber

The wheel to the road at the vertical angle. The negative camber implies an inner tilt on top of the wheel and is often used to maximise the cornering power of tire at speed with independent suspension.

Radial Force Variation (RFV)

A measurement of the tire's uniformity, under load, in regards to the variation of the load acting towards the center of the tire; commonly referred to as the tire's sidewall variation.

NVH terms – Lateral run out – Number of disturbances – Vibration order

NVH | Noise Vibration And Harshness | NVH Basics | NVH Analysis | Noise Vibration And Harshness Introduction

Radial Run out – NVH Terms

A condition where a rotating component does not rotate in a true plane. The component moves up and down on its rotational axis.

Resonance

The tendency of a system to respond increasingly to a compelling force oscillating at, or near, the natural frequency of the system. This causes a sudden and large vibration.

Vibration – Compelling force – Beat bead seating – Reliability analysis – Durability analysis

Road Noise

A noise that occurs while driving on gravel or roughly paved roads at all vehicle speeds, or when a vehicle is coasting.

Harshness – NVH Harshness – Lack of suspension feel

Shake, Lateral

A side-to-side vibration of the body, seats, and steering wheel.

Shake, Vertical

An up and down vibration of the body, seats, and steering wheel.

Vehicle Shake – Steering wheel shake – Vibration in steering wheel – Vertical shake – Lateral shake

Shimmy, High-Speed – NVH Terms

A vibration that causes the steering wheel to oscillate when driving on smooth roads at high speeds.

Shimmy, Low-Speed

A vibration that causes the steering wheel to oscillate when driving across a bump at low speeds.

Shimmy steering wheel to oscillate – High speed shimmy – Low speed shimmy due to roughness of road

Source Component

The component that is diagnosed as being the root cause of a vibration or noise concern.

Sound – NVH Terms

The result of a vibrating disturbance of an object, which produces waves that transmit out from the source.

Noise – NVH Noise – Types of noise – Unexpected sound

Static Balance

The method of balancing a tire and wheel assembly in a single plane. Static balancing removes only the lateral (side to side, wobble) imbalance and the tire and wheel assembly could possibly have a radial (up and down) vibration.

Torque Sensitive Vibration or Noise

A vibration or noise that is sensitive to different loads and torque, applied to the drive train of a vehicle. The vibration or noise changes when the throttle position or transmission gearing is used, during a road test, to change the torque applied to the drive train.

Vibration – NVH Terms

The repetitive motion of an object, back and forth or up and down, which may be felt or heard.

Automotive NVH – Brake Squeal – Vehicle NVH – Brake Squeal analysis – Finite element analysis – Vibration analysis

Wheel Diameter

The dimension of a wheel measured on the inside of the wheel at the bead seat area.

Opto Electronics | Fiber Optics Technology | Opto electronic Sensors | 6 Types Of Optoelectronics And Its Introduction: What No One Is Talking About

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 12:08:00 +0000

Opto Electronics Devices and its Applications

Optical techniques have always been used for a large number of automotive, metrological and sensing applications. Fiber- and integrated- optics technologies were primarily developed for telecommunication applications. However, the advances in the development of high quality and competitive price opto electronic components and fibers have largely contributed to the expansion of guided wave technology for sensing as well.

Types of Opto Electronic Devices

This post addresses the fundamentals of opto-electronics, with a short photon presentation. In addition various opto electronics instruments, including lamps, LEDs, photodiodes, resistors and laser diodes, will be addressed.

The word optoelectronics is a modern electronics specialization which focuses on light-emitting or light-detecting equipment.

The electromagnetic radiation (i.e., lighting) can be produced by light emitters using voltage and current. These light emitters are also used for lighting purposes or as indicator lights.

Opto Electronics Devices and its electronics applications – Lamps – LED – Photo resistors – Solar cells

In comparison, electromagnetic energy obtained by light detectors is transformed in electric current or voltage, for example by photo transistors. For light sensing and communication, light sensor instruments may be used. Examples include the switches and remote controls that are triggered by the darkness. Lighting detectors are typically used to trigger binding electrons onto the semiconductor material by using photons.

What is Opto Electronics?

Opto electronics – Optics Technology – Opto Electronics Tech systems sensor technology

It is the branch of electronics dealing with devices that generate, transform, transmit, or sense optical, infrared or ultraviolet radiation, as solar cells and lasers.

Opto electronic devices are used to activate or deactivate an electronic circuit based on the intensity of light. Besides this general purpose, opto electronics devices are used in telecommunication, surveillance systems, capturing solar energy etc. Solid state opto electronic components are used as sensors for detecting visible light, Laser Infrared rays, Ultraviolet rays etc.

Rain Sensors | Light Sensors | Optoelectronic Sensors | Passive Light Sensor

What is Opto Electronic Sensors?

Laser technology – Fiber Optics – Fiber Optics technology – Opto electronics and advanced materials

An opto electronic sensors is a device that is capable of producing an electrical signal that is proportional to the amount of light incident on the active area of the device.

Integrated opto electronic sensors are designed to recognize fundamental stimuli such as patterns, images, motion and intensity and colour.

Opto Electronics materials

Optoelectronics is based on semi-conductive materials in large part. Indirect band gaps like silicone and germanium are normally sufficient, such as in a photodetector, to exploit absorption processes, but are usually less suitable for light emitting. This is a major problem for silicone photonics, but different forms of solutions have been identified.

Nevertheless, emissions devices such as laser diodes are largely based on materials from direct band gaps, particularly III-V form – gallium arsenide and indium phosphide, for example.

Types of Opto electronic Sensors:

Opto electronic Sensor Type	Description
Light to voltage converters	Convert linear output voltage proportional to light intensity
Light to frequency converters	Convert light intensity to digital format for direct connection to microcontroller or Digital signal processor
Ambient light sensors	Measure what the human eye sees
Linear sensor arrays	Measure spatial relationships and light intensity
Colour sensors	RGB filtered sensors for colour discrimination, determination and measurement
Reflective light sensors	Convert reflective light intensity to voltage output

Opto electronic Devices with Applications

Opto-electronics is a connectivity between optics and electronics, involving the research, design and manufacturing of a hardware system that transforms electrical energy into light and light through semiconductors into energy. It consists of solid crystalline materials lighter than metals and heavier than isolation system.

Opto-electronics device is primarily a light-related electronic device. In many opto-electronic applications such as military, telecommunications, automated access control, and medical devices, the system can be identified.

The area of studies encompasses a broad variety of instruments, including LEDs and components, image collectors, displays of information, optical communications systems, optical storages and remote sensing systems, etc. E.g., telecommunication laser, blue laser, optical fibre, LED lamps, photodiodes and solar cells are the examples of optoelectronic equipment.

Why Is Everyone Talking About Optoelectronics? | 5 Awesome Things You Can Learn From Semiconductor Materials and Semiconductor Devices

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 12:07:00 +0000

Components of Optoelectronics

Contents [show]

The term optoelectronics is a specific discipline of electronics that focuses on light-emitting or light-detecting devices. These are the communication mediums between optics and electronics which includes the study, design and manufacture of a hardware device that converts electrical energy into light or light into energy through semiconductors. Light emitting devices use voltage and current to produce electromagnetic radiation i.e. light. The device is made from solid crystalline materials which are lighter than metals and heavier than insulators. Such light emitting devices are commonly used for purposes of illumination or as indicator lights.

In contrast, light detecting devices such as phototransistors, are designed to convert received electromagnetic energy into electric current or voltage. Light detecting devices can be used for light sensing and communications. Examples are darkness activated switches, remote controls etc. This device can be found in many opto-electronics applications like military services, telecommunications, automatic access control systems and medical equipments.

Types of Optoelectronics Devices

Opto-electronics are classified into different types such as:

Photodiode – A photodiode is a semiconductor light sensor that generates a voltage or current when light falls on the junction.
Solar cells – A solar cell or photo voltaic cell is an electronic device that directly converts sun's energy into electricity. When sunlight falls on a solar cell, it produces both current and voltage to produce electrical power.
Light Emitting Diodes – Light Emitting Diode is a P-N Semiconductor diode in which the recombination of electrons and holes yields a photon. When a voltage is applied to the leads of the LED, the electrons recombine with the holes within the device and release energy in the form of photons.
Optical fiber – An optical fiber is a plastic and transparent fiber either made of plastic or glass. It is somewhat thicker than a human hair. It can function as a light pipe or wave guide to transmit light between the two ends of the fiber.
Laser Diodes – LASER (Light Amplification by Stimulated Emission of Radiation) is a source of highly monochromatic, coherent and directional light. It operates under stimulated emission condition. The function of a laser diode is to convert electrical energy into light energy like infrared diodes or LEDs.

Tandem Wipers | The Ultimate Guide to Windshield Wiper Blades | 10 Fundamentals About Electronic Wiper Control

Opto-electronics Semiconductor materials:

Elemental semiconductors-Silicon, Germanium

Binary semiconductors-Aluminium, gallium, indium, phosphorus, arsenic, antimony

Ternary semiconductors-Aluminum, Gallium, Arsenic

Quaternary Semiconductors-Indium, Gallium, Phosphorous, Arsenic

Why semiconductor devices requiring emission or absorption of light?

Most LED chips are categorized as absorbing substrate devices, where the substrate material has a narrow band gap and absorbs all emission having energy greater than the band gap. Therefore, light traveling toward the sides or downward is absorbed, and such chips can only emit light through their top surfaces.

Why Opto-electronics sensor system used:

The sensors used in an automotive environment must be reliable
Produce exactingly accurate results
Require little maintenance
Help reduce overall system cost and extend the life of the system or sub system unit
Integrated opto-electronics sensors are non-contact sensors, that is, they are able to perform their sensing or measurement functions without the need for physical contact with other parts of the system or sub-system

Advantages of Optoelectronics:

Reducing the number of required components
Improving the reliability of the system or sub-system
Improving the styling, aesthetics and ergonomics of the overall vehicle through better utilization of the available space
Improving the manufacturability of the vehicle by reducing the number of sensors that need to be positioned during production
It is similar to human eye
Output current easily obtainable

Disadvantages of Optoelectronics:

They are not giving any direct feedback
Contains Cadmium, a prohibited RoHS substance
Small output current, so an amplifier required
Poor temperature characteristics

Ambient Light Sensor | LED Lighting Technology | Opto Electronic Sensor

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 12:05:00 +0000

Ambient light sensor:

Ambient light sensors automatically adjust the back lighting of the instrument panel and various other displays in the vehicle according to the varying available or ambient-light conditions. It also served in electronic equipment's like Laptop's, cell phones and LCD TV's to bring natural lighting solutions. In addition to cell phones, ambient light sensors can be used in a variety of LCD-equipped portable products including PDAs, notebook PCs, digital cameras, video players, GPS-based navigation systems, and more.

Ambient light sensors are also called illuminance or illumination sensors, optical sensors, brightness sensors or simply light sensors. In portable electronic products, reducing the power consumption to provide the user with increased battery life is one of today's critical design considerations. The liquid crystal display (LCD) and its associated backlighting are among the more (and frequently the most) power hungry loads in portable products. As a result, the use of an ambient light sensor to optimize the operation of the backlight LEDs under a variety of environmental lighting situations is increasing while, at the same time, the preferred technology choices available to designers for sensing have shifted towards more integrated solutions.

Working Principle of Ambient Light Sensor?

An Ambient Light Sensor is a specific version of a photodiode. A photodiode is a type of photo detector capable of converting light into a voltage or current, this depends on the mode of operation. A photodiode is a PN juntion or PIN structure. Light enters the top of the photodiode, a thin top P-type layer allows most photons to pass into the depletion region were electron-hole pairs are formed. The electric field across the depletion region due to the built in diode potential causes electrons to be swept into the N-layer, holes into the P-layer.

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Actually, electron-hole pairs may be formed in any of the semiconductor regions. However, those formed in the depletion region are most likely to be separated into the respective N and P regions. Many of the electron-hole pairs formed in the P and N regions recombine. Only a few do so in the depletion region. Thus, a few electron-hole pairs in the N and P regions, and most in the depletion region contribute to photocurrent, that current resulting from light falling on the photodiode.

The special thing about Ambient Light Sensors is that they perceive brightness in the same way as human eyes do. Standard photo detectors have a spectral response ranging from 1100nm right down to 350nm with the peak sensitivity around 880nm. Human eyes, however, detect a much narrower wavelength range, namely from 400 nm to 700 nm with the peak sensitivity at 560 nm.

Purpose of Ambient Light Sensor Technology

Saving Battery Power – These sensors are used as a low cost power saving solution for hand-held electronic devices. Examples, are: PDA's, Cell phones and Notebook PC's
Saving energy – These sensors can help saving energy by dimming lamps of office buildings, exterior lightings and traffic signals
Automatic dimming of flat panel displays – These sensors are used in LCD and LED screens and their goal is to maintain the same display appearance under all light conditions
Automatic dimming of instruments in automobiles to ensure relaible visibility under all circumstances
Headlamp control in cars improves road safety by automatically turning on the light in twilight or by entering a tunnel

Cabin backlight control:

For cabin backlight control LED lighting's are used. A LED lighting technology significantly improves in cabin lighting systems. LEDS are indeed useful for spot beam applications, where light can be focused directly where it is needed, in a range of color's and without disturbance to other passengers, in a word – control. But this is only the beginning, and LEDs are quite capable of providing much, much more.

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LEDS can provide colour wash to surfaces, creating sophisticated ambient and indirect lighting effects. It can do this by employing a range of colour LEDs singly or in combination or by employing tunable colour LEDs. This can be done with great precision, providing sophisticated control over colour, tone and brightness to generate an infinite variety of mood, brand or corporate effects.

Features of LED:

Soft warm light – very comfortable on the eyes
Intensity – brighter than most halogens used
Very Low power consumption – Uses only 20% of the power of standard cabin light bulbs
Low glare – great for reading
No harmful UV emissions – easy on the eyes
Built in dimmer logic works with most standard dimmers or our optional mini-dimmer

Ambient light sensor in LCD TV's, Laptops and Cell Phones:

It is a sensor that detects light so if it's dark your screen monitor brightness will dim down. So you're not looking at one source of extreme bright light, when its bright the screen monitor will go up to compensate for the extra light around you, so you can still see the monitor comfortably.

Bright Room

Dark Room

Dimly Light Room

In addition to providing a pleasant-looking display, ambient light sensors also help reduce power dissipation and maximize the life of the backlighting system.

Ambient light sensors are included in many laptops and cell phones to sense the environment lighting conditions, allowing for adjustment of the screen's backlight to comfortable levels for the viewer. The range of "comfortable levels" is dependent on the room's light.

Understandably, a screen's brightness needs to increase as the ambient light increases. What is less obvious is the need to decrease the brightness in lower light conditions-for comfortable viewing and to save battery life. In a cell phone, the ambient light sensors are located under a protective cover glass. Because of this protection, most of the ambient light is obstructed. The obstruction reduces the amount of light to be measured, requiring a solution with low light accuracy. For the accuracy needed in low-light conditions, the best sensor choice is the integrated photodiode with an ADC.

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Tandem Wipers | The Ultimate Guide to Windshield Wiper Blades | 10 Fundamentals About Electronic Wiper Control

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 12:01:00 +0000

Tandem Wipers

A wiper motor, cranks, wiper arms, and wiper blades make up a full wiper unit. An electric pump, hoses, container washer fluid, and nozzles make up the washing system. These two mechanisms work together to provide a successful cleaning system.

Wind Shield Tandem Wipers System Specifications

The following criteria must be fulfilled by the wiper system:
Snow and water removal
Dirt removal
Activity at high (up to +80 degrees Celsius) and low temperatures (upto -30 Degrees Celsius)
Tolerance to acids, alkalis, salts, and ozone corrosions
For a passenger vehicle, the service life is 1.5 million wipe cycles.

Windshield Wipers:

Conventional wiper drives have only one direction of rotation, and the direction of wiping is changed mechanically. The new electronically controlled motor reverses its direction of rotation at the turning point of the wiper – therefore, the mechanical components require less space.

The electronic controller ensures a maximum visibility area at all times, irrespective of wiping speed, coefficient of friction or wind force. Through exact adherence to the wiping angle, it is possible to reduce the tolerance distance to the edge of the windscreen to a minimum and thus to enlarge the swept area. The controller can detect obstacles such as packed snow at the reversing points and automatically reduces the swept area to prevent the system from blocking. The speed of the motor is reduced before reversal to ensure quiet running.

The electronic speed controller is also very practical in conjunction with a rain sensor: depending on the quantity of water on the windshield, the drive unit can be operated at a continuously variable wiping speed.

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The electronically controlled wiper motor also allows the use of two-motor wiper systems. Each wiper arm is moved by its own drive unit, and the electronic controller is responsible for the coordination of the movements.

History of Wind – Shield Wipers

The first windshield wiper was invented around 10 years after the first car was built. The idea of a windshield wiper came about when the president of Trico drived his vehicle on a rainy day in the United States. Sadly, he hit a kid due to his failure to properly see the lane. The boy wasn't seriously injured and in rainy weather he decided to deal with the issue of poor view. This prompted the windshield wipers to be born. In 1917 the windshield wiper blade was invented by Trico, also known as the tri-continental company.

The first wiping design was made by a rubber blade rotated manually on the windshield. Obviously this was a disappointment, and a vacuum-driven wiper mechanism quickly substituted it. However, the fact that its operating speed has changed with the speed of the vehicle threatened this design.

This malfunction ultimately causes an electric motor to be attached to the wiper arm. This is primarily the design still in use. The new study focuses on the use of synthetic rubber rather than natural rubber.

Types of Windshield Cleaning Mechanisms

Tandem Wipers
Opposed Wipers
Tandem Wipers with aerodynamic characteristics
Single arm wipers (No control)
Single arm wipers (Controlled)

Tandem Wipers Blade Material

The rubber compound consists of three different combinations:

Natural rubber
Synthetic rubber
Two elements that are either synthetic-synthetic or natural-synthetic-synthetic

For the wiping quality at different temperatures, the rubber properties are significant. And when they get cold, the lowest temperature are the harder to get a decent wiping consistency. Tests showed that in low temperatures, natural rubber is the most effective.

Advantages of Tandem Wipers:

This system requires no connecting rods
Reduced space requirements and
Lower weight.

Features & Benefits of Tandem Wipers:

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An extended parking position is available as an additional function: this means that when the wipers are switched off, the wiper arms are parked under the trailing edge of the bonnet. This improves the aerodynamics of the vehicle. Driving noise is reduced and the driver's field of vision is enlarged. At the same time, the risk of injury is reduced in the event of accidents with pedestrians and two-wheeled traffic.

Rain Sensors | Light Sensors | Optoelectronic Sensors | Passive Light Sensor

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 11:59:00 +0000

Rain Sensors

Optoelectronic Light and rain sensors, which transform light of different wavelengths into electrical signals, which are known as optoelectronic sensors. The light therefore causes electrons to be released from a semiconductor or metal surface, and if there is an external electric field, the free charge carriers that are produced as a consequence of this result in a photometric current that is proportional to the light's intensity.

Rain sensors systems:

Opto electronic sensors are used in a reflective mode in rain sensor systems to detect the presence of water on the windshield so that the windshield wipers can be controlled automatically. In-vehicle safety and comfort are considerably improved thanks to the rain sensor, which relieves driver fatigue by automatically activating the windshield wiper system when it rains and thus significantly enhancing in-vehicle safety and comfort. The rain sensor first appeared in automobiles in the mid-1990s, and it has since become an indispensible component of contemporary car electronics.

An LED emits light in such a way that when the windshield is dry almost the entire amount of light is reflected onto a light sensor. When the windshield is wet, the reflective behavior changes: the more water there is on the surface, the less light is reflected. In the new rain sensors, infrared light is used instead of conventional visible light. This means that the sensor can be mounted in the black area at the edge of the windshield and cannot be seen from outside.

Working Operation of Rain sensors:

An infrared beam is reflected off the outer windshield surface back to the infrared sensor array. When moisture strikes the windshield, the system detects a reflection to its infrared beam. Advanced analogue and digital signal processing determines the intensity of rain. The sensor communicates to the wiper control module, which switches on the wiper motor and controls the wipers automatically, according to the moisture intensity detected.

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Depending on the quantity of rain detected, the sensor controls the speed of the wiper system. In conjunction with electronically controlled wiper drive units, the wiping speed can be continuously adjusted in intermittent operation. In the event of splash water – as when overtaking a truck – the system switches immediately to the highest speed.

The new rain sensors offers further options. For example, it can be used to close windows and sunroofs automatically if the vehicle is parked and it starts to rain. It can even be fitted with an additional light sensor to control the headlights – at night or at the entrance to a tunnel, the lights can be switched on without any intervention by the driver.

For Windshield wipers working operation Click this Link.

Light Sensors:

Automatic lighting of the headlights is controlled by a passive light sensor. It measures available light using a set of photo-electric cells.

The light sensor comprises three lenses that focus the light onto three photo-electric cells. This allowed "the luminous space" surrounding the vehicle into several zones through the directivity of each basic lens cell pair.

Lens 1: Measure total ambient light
Lens 2: Intersect Front source of light
Lens 3: Distinguish Road Condition (Like brighter sunny weather condition or Dark tunnel)

By comparing the information gathered by these three devices, the system computer determines the situation with which the vehicle is confronted and commands the headlights in consequence. An optoelectronic detector is used to measure the illumination conditions outside the vehicle. The sensor captures certain wavelengths using an upstream filter glass in order to differentiate between artificial light and natural light, according to the manufacturer. Two sensors, each of which operates independently of the other, are used to measure the ambient light and the front-end illumination.

In order to do this, the receiver properties of the sensor must be tailored to the specific installation scenario. In addition to using sensor data, a special algorithm incorporates information from the vehicle electronics to detect various lighting conditions (day, night, sunset or when passing through a tunnel or bridge) and turns on or off the daytime running light in response to the detected lighting conditions.

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Electro Chromatic Auto Dimming Mirror | Opto Electronic Sensor Uses In Glare Free Rear View Mirror And Side View Mirror | Smart Glass With SPD Technology

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 11:57:00 +0000

The advantages of Electro Chromatic Auto Dimming Mirror

These Electro Chromatic Auto Dimming mirrors are sometimes known as auto dimming rear view mirrors, which accurately describes what this technology achieves. When headlights reflect on the mirror's surface, it dims automatically, reducing glare and discomfort. They do, however, dim in proportion to the amount of light shining on them.

As a result, with brighter headlights or when those headlights are closer to your automobile, the mirror will dim more. The following are some of the benefits:

For nighttime driving, there is no need to manually adjust the mirror.
Auto dimming technology guarantees that the appropriate level of dimming is maintained at all times.

A vision that is clearer than what is achievable with standard rearview mirror technology

As you can see, an Electro Chromatic Auto Dimming Mirror option may be worth considering if you need a new rear view mirror, and it may be preferable to rear view mirror repair if your current mirror is broken. This technology is also available on side view mirrors, however upgrading a car may be expensive.When purchasing a new automobile, most OEMs (Original Equipment Manufacturers) provide electrochromatic side view mirrors as part of higher-end packages.

Electro-chromatic mirrors system:

Electro chromatic mirrors / Auto dimming mirrors use a combination of opto electronic sensors and complex electronics (sensors, circuit boards, micro-controllers, etc.) that constantly monitor ambient light and the intensity of light shining directly on the mirror. As soon as sensors detect glare, the electro chromatic surface of the mirror becomes darker to protect driver's eyes and their concentration.

The electro chromatic technology usually is applied to the inside rearview mirror / Side view mirror, where it basically saves you the trouble of flipping the mirror manually if blinded by the light which increases driving safety.

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Working operation of Electro Chromatic Auto Dimming Mirror:

This auto dimming rearview mirror is installed on higher end vehicles. It consists of two lenses that sandwich an electro chromic (electronic color changing) gel. The inside sides of the lenses are coated with a transparent conductive layer coating and the deepest lens has a reflective coating.

This gel, when charged with electricity darkens, then clear once the glare is no longer detected. The mirror uses a forward sensor which measures the outside ambient light, and a rearward sensor to look for glare. When dark enough, it sends current to the electrostatic gel, darkening it a rate which is related to the level of ambient darkness and rearward glare. When the outside ambient light increases, the current decreases, until the gel is clear again at daylight light levels.

Types of Electro Chromatic Auto Dimming Mirror

What are auto dimming mirrors?

Auto dimming mirrors are a sort of rear view mirror that has the capacity to reduce the light that reflects off of its surface. These mirrors greatly decrease the glare of light from following cars, decreasing driver tiredness. Naturally, such mirrors come in handy while driving at night on busy routes with a lot of traffic. This sort of rear view mirror may be found on both the inside and outside of a car. Auto dimming mirrors were first introduced in the late 1950s, according to history. Their commercial application, on the other hand, began after 1980. Gentex is one of the most well-known auto dimming mirror manufacturers.

Why to use auto dimming mirrors?

While driving at night on a busy road, the glare of the light from behind that reflects from the mirror annoys the driver greatly. It also has a negative impact on visibility. Long-term exposure to such light causes considerable strain in the eyes of the driver. According to scientific research, a glare like this nearly doubles the driver's reaction time, increasing the likelihood of an accident. To avoid such incidents, auto dimming mirrors are used by manufacturers. These mirrors are rapidly gaining favour in the automotive sector.

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Advantages of Electro Chromatic Auto Dimming Mirror:

It improves nighttime visibility, which is otherwise impeded by glare from other vehicles' lights.
Because of the increased visibility, it improves safety.
It decreases eye strain and tiredness in drivers.

Smart Glass with SPD (Suspended Particle Devices)

Managing light is a universal need for survival, and it is also an important component of art. Traditional techniques of controlling the amount of light that enters rooms and vehicles have their limits. Blinds, curtains, and shades reduce incoming sunshine, but they also reduce the amount of visible light. Tinted glass may be problematic since it can block too much light at times and not enough at others. Making the most of natural light and energy efficiency while utilizing these conventional techniques is a difficult task.

Using SPD Smart Glass, you may achieve the world's most comprehensive answer to the problem of being connected to the outside world while simultaneously regulating incoming light, glare, and heat. SPD Smart Technology, which is a key component of daylight harvesting methods, has the potential to decrease energy consumption while simultaneously improving the well-being of building occupants and vehicle passengers. It serves as an inspiration for architectural, automotive, aeronautical, and maritime projects by encouraging innovation and beautiful design.

Strength of SPD Glass:

SPD Smart glass windows are extremely robust and durable making them suitable for overhead vitrages, children's rooms, bedrooms, conservation areas, gymnastics centres, swimming pools etc.

Protection Against Noise:

When compared to conventional insulated glass units, the level of protection is much higher.

SPD Smart glass has a number of advantages.

Light control that is both instantaneous and accurate
Cost savings on cooling and lighting due to energy conservation
Environmentally friendly
The elimination of the necessity for costly window dressings such as electronic louvers, blinds, and shades utilized in architectural applications as a result of the exceptional optical characteristics that minimize glare and eye strain.
High durability, solid state technology, with no moving components to wear out or break
Large sizes of any form may be manufactured with no limitations on production capacity.
Color qualities that remain stable over the life of the unit
There is a wide temperature range of – 30 to + 90 degrees Celsius, making it suitable for outdoor applications.
Controlling the temperature of the surrounding environment
Appealing in terms of appearance
Material that is hygienic and requires less maintenance
Improved public perception of the company and its employees
Wide light transmission ranges are available
Reducing fading of carpets and furniture, in addition to safeguarding priceless artwork
Protecting the skin from the sun's harmful ultraviolet rays
Excellent UV stability
Excellent contrast at every viewing angle and under any light level
Reasonably priced.
Long service life – tested to withstand more than 100,000 cycles.

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10 Unexpected Ways Belt Conveyor Can Make Your Life Better | Belt Conveyor Design | Belt Conveyor Parts | Belt Conveyor Rollers

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 11:53:00 +0000

Belt Conveyor

Basically, a belt conveyor system is made up of a continuous belt of durable material that is linked between two flat pulleys and is moved by spinning one of the pulleys with an electric motor attached to it. Usually the opposite end pulley (driven pulley) feeds the material onto the belt. With its self-weight as well as its pay load, the moving belt that transports the material towards the driver pulley would most likely sagging between the two end pulleys.

As a result, a number of rollers, referred to as idlers, are used to support the belt on both the carrying and the return sides of the conveyor. The belt is susceptible to elongation since it is always under stress, causing it to hang loose over the pulleys and causing it to lose tension and power. Because of this, the system includes some kind of mechanism for tightening the belt. The take up arrangement is the name given to this tensioning mechanism. The system is, by its very nature, extremely simple.

A number of excellent characteristics of belt conveyors, such as their economy and safety of operation, their dependability, and their ability to perform virtually any processing function while maintaining a continuous flow of material between operations, have helped them to achieve a dominant position in bulk material transportation. When compared to other modes of transportation, belt conveyors have significant advantages in terms of labour and energy needs. Belt conveyors' dependability has been proven over decades and in a wide range of industrial applications.

When compared to other modes of transportation, belt conveyors have a lower environmental impact. They do not contaminate the air or cause deafening noise in the surrounding area. Belt conveyors are capable of carrying a broad range of commodities at a pace that is far in excess of any practical need. Belt conveyors have the ability to transport goods over long distances and across a wide range of terrains, including rough terrain.

Essential components of a belt conveyor:

Belt conveyors consists of a driving pulley at the head end, and take up pulley at the tail end, both being accommodated in a steel frame. An endless belt connects the two pulleys on both runs and supported by suitable roller type supports, called the idlers. At the upper side of the conveyor also called the carrying side, because the pay load is carried on this side, the belt is supported by idler.

At the other side also called the return side because usually there is no pay load, the belt is supported by idlers. In some designs the belt is supported by a stationery runway instead of idlers. In some special installations both the upper and lower sides transport loads (usually unit load) simultaneously in opposite directions. The driving pulley receives its rotation from drive unit.

The material to be transported is put onto the conveyor belt via one or more feed hoppers that are installed above the conveyor belt line and are typically located on the tail end side of the conveyor belt line. The load carried by the moving belt is released into the discharge spout by passing through the driving pulley. By using specific discharge devices, it is possible to arrange for discharge to occur at any point along the conveying route.

A device known as the take up arrangement is connected to the take up pulley on the tail end side of the belt in order to maintain the belt under the utmost strain and prevent the belt from slipping over the pulleys as a result of the belt's length expansion. Belt cleaning is used to remove material that has adhered to the outside of the belt face. In most cases, it is situated near the driving pulley.

Belt Conveyor design and construction

Belts are made up of one or more layers of different materials. It is usual for belts to have three layers: a top cover, a carcass, and a bottom cover, with the top cover serving as the outermost layer. In certain cases, however, more levels may be required depending on the nature of the items being transported on the conveyor system. The carcass's primary function is to give strength and form to the conveyor system, and it is often made of woven or metal cloth with a warp and weft pattern.

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In belting, the warp is a term that refers to longitudinal cords that determine the running characteristics of the belt owing to the fact that it is responsible for the degree of resistance and flexibility of the belt. In this case, the weft symbolizes the whole set of transversal wires, and it allows the belt to be very resistant to cuts, rips, and impacts while simultaneously being extremely flexible to guarantee that the system does not break easily.

Steel, polyester, nylon, cotton, and aramid are the most often used carcass materials, while the covers are typically made of a variety of rubber or plastic compounds that are determined by the use of the belt. The usage of steel conveyor belts, which have a high strength and improved longevity, is recommended when the conveyor system is transporting large loads. Steel conveyor belts are constructed of steel cords, as opposed to lower-class strength conveyor belts that are constructed of polyester, nylon, and cotton fibers.

The lower the strength of the material utilized or the smaller the capacity of the conveyor system installed, the less energy will be required for operation, while simultaneously improving the product life and boosting productivity. Among the most important components of a conveyor system for ensuring smooth operation is the Drive Arrangement, which is composed of Gear Boxes, Drive Motors, and the related couplings. On top of that, there are a variety of components that may be used or that are required for a well working conveyor system.

Scrapes are used to clean the belt, chutes are used to regulate the discharge direction, and skirts are used to keep the discharge contained on the receiving belt, among other things. Take-up assembly for "tensioning" the belt, as well as Technological Structures such as Stringer, Short Post, Drive Frames, and Pulley Frames, make up the balancing components that combine to form a complete belt conveying system that is fully operational.

Conveyors made of a blue material are used in the food manufacturing sector. This implies that they may be washed, also known as non – greasy, in order to meet with food-handling hygiene regulations.

Application of belt conveyor:

Belt conveyors are employed to convey a great variety of bulk materials and also unit loads along a horizontal or gently inclined paths. Such duties can be performed within the factory shed or in outdoor work. Within the factory shed belt conveyors are also employed to carry articles of light weight in line production from one operation to another. Belt conveyors are used to mechanize material handling operations in foundries to distribute moulding sand, mould cores and cast articles. Belt conveyors are used for carrying coal, ores, and minerals in power plants, mining industries, and metallurgical process plants. For handling food grains and building materials belt conveyors are frequently employed.

Capacities of a belt conveyor system may range from 500 to 5000 m³ / Hr. and more. The distance covered for a belt conveyor system may be as small as 50m (for indoor work) to 5 Km for supplying raw material from mine area.

Belt Conveyor Rollers or Idler Rollers

Conveyor rollers, also known as idler rollers, are a major element of any conveyor system's operation. It is their job to run along beneath the belt, assisting with material weight support and impact absorption, among other things. Steel and plastic are two of the most used often materials, but which is the best choice for your needs and circumstances?

Steel rollers (especially mild steel and stainless steel) appear to be the most popular option for many businesses that use conveyor systems. Plastic, on the other hand, may be a suitable option in some circumstances.

When choosing whether to use steel or plastic rollers for your belt conveyor system, there are a number of essential variables to consider. These factors include the types of commodities typically handled, the environment in which your belt conveyor system works, the scale of your activities, and the expenses associated with them, among other things.

Transported Materials in Belt Conveyor Rollers

The type of material that your conveyor system carries is an essential consideration when choosing whether to use steel or plastic as a construction material. When the materials are heavy and/or big in size, steel rollers are more effective in withstanding the weight and impact force of the materials. Plastic rollers are better suited to lighter weight materials than steel rollers since they are not as durable as steel.

Corrosive materials, on the other hand, may cause mild steel rollers to wear out and fail prematurely. Because stainless steel and aluminum steel rollers are more corrosion resistant than mild steel, they are a good alternative to mild steel. Plastic rollers are another alternative that is resistant to corrosives.

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Environmental Factors when selecting Belt conveyor rollers

Plastic rollers may also be damaged by high-temperature environments (particularly ones found in the desert). Steel rollers are capable of withstanding very high temperatures, both in terms of the working environment and the temperature of the materials carried.

As exposed to high temperatures, plastic exhibits a higher degree of thermal expansion when compared to steel. When utilizing plastic rollers, the working temperature must be carefully examined; otherwise, the rollers may fail due to warping and fail prematurely.

Operational Capacity of Belt Conveyor Roller

The constrained durability and strength of plastic belt conveyor rollers makes them more suitable for smaller conveyor activities, such as those used in the food manufacturing industry. However, many food manufacturing companies are increasingly choosing stainless steel rollers over plastic rollers because of their food-grade standard, as well as the fact that they are corrosion-free and simple to clean.

Steel rollers are preferable for bigger operations, such as those in the mining sector, since they are usually larger in size, have a greater capacity, and have a longer life span than other materials.

Costs of Belt Conveyor roller

When it comes to manufacturing costs, steel rollers are nearly always less expensive than plastic rollers. Steel rollers have been the industry standard for many years in the mining sector, and they are produced in large quantities to take advantage of economies of scale. Over the years, the production process has been continually refined and modified to the point that it is now considered a fine art form.

Plastic rollers are still a relatively new product, and there is still much room for improvement in terms of innovation.

Aspects Design of idler roller

Plastic is a basic material that is not as strong or durable as steel, and as a result, plastic rollers are inherently weaker than steel rollers in terms of strength and durability. Plastic rollers, on the other hand, have the benefit of not inflicting damage to the belt.

Steel rollers are utilized beyond their operational life, resulting in the roller shell being worn through and exposing the side plates. W It's like a pizza cutting wheel when the side plates are exposed, and the upright edge cuts into and damages the conveyor belt while it's operating.

Plastic belt conveyors are often softer in texture than rubber conveyor belts. In this case, the plastic rollers are too soft to harm the belt.

The Top 4 Idler in the Belt Conveyor Business

Idlers are installed at various points along the belt conveyor, depending on the function for which they are being used. There is a vast range of idlers available; nevertheless, the four most popular idlers each have their own set of advantages over the others. Some of these advantages include impact absorption, support for both the carry and return sides of the belt, and the ability to keep the belt traveling in the proper direction.

1. Trough Idlers

A trough idler is the most typically recognized type of carry idler. Trough idlers are usually built with 3 to 5 idler rollers and are installed on the conveyor belt's carry side. The 5 roller idler has a more uniform cross section, which results in a higher net carrying capacity. The 3 roller idler design features a center idler roll as well as wing idlers on each side of the center idler roller.

Using trough idlers has the advantage of ensuring that the load-bearing capacity of the conveyor is consistent over its entire length, which is beneficial in many situations. Material that has reached its maximum capacity at the loading point will not fall off the belt as a result of more equal load distribution.

2. Idlers with a flat return

They are the most frequent kind of idler on the return side of a conveyor, and they are made of single steel that is placed on two drop brackets. Although flat return idlers are most often manufactured with a single roller design, they may also be manufactured with two rollers.

The aim of employing a flat return idler is to provide support for the conveyor belt from the return side in order to avoid stretching, sagging, and failure of the belt, thus increasing the service life of the conveyor belt and reducing maintenance costs.

3. Impact Idlers

When material is being loaded onto the belt, impact idlers are used to prevent belt damage from occurring as a result of the falling material and constant collisions. Impact rollers are designed to absorb impact forces, thus reducing the likelihood of damage to the conveyor belt, idler frame, and surrounding structure.

The primary advantage of employing impact idlers is that they avoid damage to the belt, which is advantageous since belts are expensive to repair and replace. As a result, they contribute to increased production while decreasing maintenance expenses.

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4. Training Return Idlers

Training Return Idlers a djust the belt misalignment in order to ensure that the belt tracks properly at the tail end of the conveyor while it is running during operations.

A misaligned belt that drags against a permanent structure such as the head chute or a conveyor component may cause significant damage to the belt and everything else it comes into touch with, including the structure itself. As a result, employing a training return idler helps to minimize belt damage and subsequent maintenance costs for the belt, structure, and components.

Types of Idler Rollers

Idler rollers, or more often referred to as conveyor rollers, are cylindrical-shaped bars that travel alongside and under the surface of a belt conveyor. Idler rollers are available in a variety of configurations and with a variety of purposes.

Idler rollers are often used to assist in the sustaining of the weight and impact of the items being carried down a belt conveyor. Moreover, they contribute to the smooth and continuous flow of the material down the belt conveyor.

Self-aligning idler rollers may aid in the maintenance of belt tracking by assisting in the alignment of the rollers. Depending on the construction and form of the conveyor belt, the rollers are typically positioned inside a metal frame, which is referred to as an idler set, and are connected together.

1. Idler Roller Options That Can Be Customized

Idler rollers may be customized to meet the needs of almost any conveyor application. Bearing brand, bearing size, bearing diameter or bearing series, wall thickness, seal type, and material type are only a few of the factors to consider. Various variables may be chosen and customized to meet the requirements and specifications of your application's standards and specifications.

Idler rollers are employed in a variety of operations, and some of the variables that influence their selection include the material type, specific gravity of the material, and lump size.

2. Plain Idler Roller

Plain rollers are the most popular type of idler roller used in several applications. Conveyor belt supports and shapes are provided by these devices. Plain rollers may be installed on the load side of a belt in trough, tracking, and transition frames, among other configurations. In addition, they may be installed on the belt's return side as an option.

3. Tapered Idler Rollers

The tapered idler roller may be placed on either the load or the return side of the belt, depending on the application. In the event that they are placed in a tracking frame, they may help in belt conveyor tracking.

4. Idler Rollers with a Rubber Coating

The term "rubber coating over the idler roller" comes from the rubber that is vulcanized directly to the roller, which gives the roller its rubber coating. The tear, impact, and friction resistance of rubber coated idler rollers makes them more durable than non-coated idler rollers. As a result, they have a longer service life.

5. Idler Rollers with a Rubber Disc

A idler roller with rubber disk is comprised of resilient rubber discs that are spaced at regular intervals throughout the length of the roller. Rubber discs are packed together on the two ends of the roller to give additional support for the conveyor belt edge on both ends of the roller.

The rubber disks are placed in a dispersed manner in order to separate any carry-backs (leftover materials adhered to the belt after a scraper has performed its cleaning function). This aids in reducing material build-up on the exterior of the roller, which is a frequent cause of belt mistracking and belt sticking on obstacles.

6. Rubber Screw Idler Rollers

Rubber screw idler rollers have an anti-tear rubber covering applied in a continuous screw pattern throughout the roller's length to prevent wear and tear. The screw design aids in the removal of material build-up on the belt as well as the maintenance of belt trackability and tracking accuracy.

7. Screw Idler Rollers made of steel

These rollers are similar in appearance to rubber screw idler rollers, with the same continuous screw-patterned covering running the whole length of the roller. However, steel is used as a component rather than rubber in this case.

The screw design aids in the removal of material build-up on the belt as well as the maintenance of belt trackability and tracking accuracy. Due to the fact that steel screws scrub more effectively than rubber screws, steel screw idler rollers are more efficient in situations when there is a lot of carry back.

A mobile plant conveyor, for example, is an example of an application where a steel screw idler may be useful since scrapers cannot be utilized to clean the belt. It is not feasible to install a scraper on a mobile plant conveyor because there is insufficient space. Another example is a folding conveyor, which may make it impossible to attach such devices to the conveyor.

Belt Conveyor Belt Specification | Belt Conveyor Standards | Selection Of Belt Drive | Belt Conveyor Selection

noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 11:51:00 +0000

Selection of Conveyor belt:

To select the correct conveyor belt for your application involves a large number of considerations. Final selection may very well represent a compromise between what is desired and what is available.

To assist you in obtaining the proper information required to select a proper belt construction, the following check list is provided.

Material Conveyed

a. General description
b. Density, pounds per cubic foot (pcf)
c. Lump size
d. Presence of oils or chemicals, if any
e. Maximum temperature of load, if hot
f. Requirements of fire resistance

Maximum loading rate or required maximum capacity, tons (2000) lbs. per hour (tph)
Belt

a. Belt width, inches
b. Belt speed, feet per minute ((fpm)
c. Belt Type
d. Thickness of Top and Bottom Cover (inch)

Drive

a. Type
b. Voltage
c. Frequency
d. Motor power
e. Motor Speed

Center of center distance (length) of Belt
Profile of Conveyor

a. Profile distance along conveyor path
b. Elevations
c. Locations of all vertical curves and angle of slope

Drive

a. Single-pulley or two-pulley
b. If two-pulley, geared tandem or dual-drive
c. If dual-drive, distribution of total motor horsepower at primary and secondary drive pulleys
d. Angle of belt warp on drive pulley(s)
e. Location of drive
f. Pulley surface, bare or lagged. Type of lagging
g. Type of starting to be employed

Pulley

a. Head Pulley Type
b. Drive Drum Diameter
c. Tail Diameter
d. Snab pulley Diameter
e. Angle of Wrap on drive Pulley

Take-up

a. Type
b. Location
c. Take up Pulley Diameter
d. Bend pulley Diameter
e. Take up movement

Idlers

a. Idler Trough Angle (30 Deg)
b. Type of Carrying Idler, Type of Return Idler, Type of Impact Idler, Type of Training Idler
c. Carrying Idler Diameter, Return Idler Diameter
d. Spacing, including transition distance at head and tail
e. Carrying Idler Pitch, Return idler pitch

Type of loading arrangement

a. Chutes
b. Free-fall distance, lumps to belt
c. Skirt board length

Lowest cold weather operating temperature anticipated, if applicable
Type of belt splice to be used
Design Conditions

a. Altitude (example.18m)
b. Material (Ex. Iron Ore Pellets)
c. Bulk Density (Ex. 2.1 t/m3)
d. Angle of Repose (Ex. 30 Degree)
e. Ambient Temperature (Ex. 38 deg. Celsius)
f. Material Characteristics (Ex. Very abrasive)
g. Rated capacity (Ex.1800 t/h)
h. Design Capacity (Ex. 2100 t/h)
i. Conveyor Slope Angle (Ex. 9.5 Degree)
j. Belt conveyor horizontal length (Ex.200 m)
k. Belt conveyor lift length (Ex. 35 m)
l. Belt conveyor length (Centers of Head & Tail) (Ex. 200 m)

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noreply@blogger.com (Geetha) — Sun, 10 Oct 2021 11:48:00 +0000

Belt Conveyor Types:

Whether gravity or motorized, these belt conveyor types are frequently used to transport bulk or unit loads regularly or periodically, unidirectionally, from one location to another along a set route. The main purpose of the belt conveyor types of equipment are the conveyance of material with the assistance of the movement of various sections and components of the equipment.

When most people hear the word "conveyor," the first thing that comes to mind is "conveyor belt" for them. Conveyor belts, which are also among the most popular kinds of conveyors, are straightforward in their technique of transporting goods from one place To end place – and they are also cheap in cost.

Some of the Belt Conveyor types are listed below:

Troughed belt conveyor
Flat belt conveyor
Closed Belt Conveyor
Metallic belt conveyor
Portable belt conveyor
Telescopic belt conveyor

In this articles, a few belt conveyor types are explained

The Components of a Belt Conveyor

(a) Conveyor belts are a kind of belt that is used to transport goods.

(b) Idlers:

A belt's active side as well as its return side are supported by idlers, which are rollers that are spaced at certain intervals along the belt's length. Idlers that are precisely manufactured, firmly mounted, and properly maintained are essential for the smooth and effective operation of a belt conveyor types.

Construction of the idler:

To make idlers, steel tubes complying to IS 9295:1983, which have been evenly machined all over their outer diameters and at both ends of their inner diameters, are often used. All of the tubes are supported by anti-friction bearings that are attached on a fixed steel spindle. In order to allow for fast installation in slots in the idler structure, the spindle ends are flat cut to standard specifications. Heavy steel tubes may be used for the idlers under harsh service conditions (such as in the material loading section), or cast iron may be used in corrosive environments (handling coke etc.).

In addition, at each of the two ends of a belt conveyor types, a big diameter pulley is placed against which the belt rotates and changes direction. These pulleys are referred to as terminal pulleys or bend pulleys.

(d) Drives for Belt Conveyors:

Belt conveyors are typically driven at the head end pulley, which is where the material is released from the conveyor.

(e) Take-ups or Belt Tensioning Devices:

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It is necessary to tighten the endless conveyor belt after it has been threaded over the full length of the conveyor in order to provide adequate frictional force between the driving pulley and the belt in order to move the belt.

(f) Loading and unloading devices:

For free flowing material, a chute may be used to transport it straight from a hopper, bin or storage pile to a receiving area, with the rate of delivery regulated by a regulating gate located at the hopper / bin output.

(g) Belt Cleaners:

A wiper or scraper blade is used to clean the outside surface of the belt of any dry particles that have adhered to it. When cleaning wet or sticky objects, a rotary brush type cleaner is utilized. A scraper is positioned at the end of the return run before the tail end pulley in order to clean the inner surface of the belt if it is necessary.

(h) Training idlers:

For a variety of causes, such as eccentric loading, material adhering to the belt or idlers, and so on, the belt may tend to wander off of the center line, which is especially problematic for long-center conveyors. It is necessary to employ belt training idlers in order to avoid this propensity since they automatically maintain belt alignment.

(i) Conveyor structure:

The structure that supports the pulleys and idlers is made up of channel stringers of appropriate size that are connected to the main structure or floor by supporting legs.

(j) Transfer terminals:

The direction of a long-center conveyor is changed at a transfer terminal, which is where materials from one conveyor are moved into another conveyor, in a long-center conveyor. When compared to the first conveyor, the second conveyor is set out at a particular angle (usually 90°). The discharge from the first conveyor occurs at a higher position, and the materials are guided to the second conveyor, which is located at a lower height, via a transfer chute that is appropriately formed and proportioned for the job.

Troughed belt conveyor | Belt Conveyor Types

The troughed belt conveyor is one of the most frequently used and well-known belt conveyor types of designs among all sorts of belt conveyor types, and it is arguably the most common. The troughed belt conveyor has proved to be a dependable and flexible conveyor in a wide range of applications, and it is probably more tolerant than most other kinds of conveyors when subjected to poor operating circumstances than most other forms of conveyor.

The development of robust technology to assist in the design of conveyor systems, as well as advancements in design optimization and a better knowledge of the dynamics that exist in conveyor belts while in operation, have propelled troughed belt conveyors into a wider range of applications and higher conveying capacity.

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Troughed belt conveyor: a functional description

Uninterrupted, rubberized flat belts are hung between pulleys at each end of a troughed belt conveyor's length and supported throughout its whole length by a series of revolving idler rollers. It is typically a head pulley that drives the belt, and it is a sliding pulley that maintains the tension in the belt that is connected to a gravity take-up unit that drives the belt.

An apron-loading chute loads material onto the conveyor from the tail end, and it is carried along its carrying side to the head end, where it empties into a discharge chute that directs the product to the downstream equipment.

It is necessary to have impact idlers installed at the loading point to sustain the belt when a load is dropped down the loading chute and hits onto the belt. The return belt, which is directed back to the tail pulley by return idlers, is used to release the material from the carrying belt once it has been unloaded from it.

There is a distinct difference in the spacing between the impact, carrying, and return idlers. The mass of the belt plus the load carried on the carrying side is larger than the mass to be sustained on the return side, and as a result, the idler spacing is chosen in accordance with the tension in the conveyor belt. It is thus necessary to construct the'sag' in the belt between the carrying and return idler sets on the basis of the highest weight that will be transported by the conveyor.

It is possible to integrate snub pulleys into the design of a conveyor system in order to enhance the angle at which the belt is wound around the driving pulley. As the belt travels around the drive pulley without slipping, the higher wrap angle of the pulley enables for more power to be supplied into the system. Thus, on longer conveyors or conveyors carrying heavy conveying loads, fewer drives are required.

Troughed belt conveyor is that in which the belt forms a trough on the carrying side while running over idler rollers which are either in set of 5 rolls, 3 rolls or 2 rolls. The troughing angle adopted are: 15°, 20° , 25° , 30° , 35° , 40° , 45° . Return idlers are usually straight roller type.

Transverse flexibility or rigidity of the belt is another significant consideration. It is important that the belt trough properly. The empty conveyor belt must make sufficient contact with the center roll in order to track properly.

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Troughed belt conveyors are used for higher capacity, higher speed requirement, and for handling bulk material of large lump size. It suitable for inclined or declined type conveyors.

Transition distance is defined as the distance from the center line of the first fully troughed idler roll to the center line of either the head or tail pulley. The distance from the pulley to the top of the wing idler is certainly greater than the distance from the pulley to the center roll of the troughing set. If the transition distance is too short, the edge of the belt can be over stretched. This will adversely affect the load support and belt life.

Troughed belt conveyors have a wide range of applications.

Troughed belt conveyors are widely utilized in the bulk materials handling sector, and examples of applications where this kind of conveyor is frequently employed are given below.

Horizontal and inclined short plant conveyors are available.
Long overland conveyors may be either straight or curved in their path across the landscape.
Transporter with the ability to reverse direction.
Slewable boom conveyors with a stacker and a mounting base
Mining conveyors that are incline.
Conveyors that can be shifted.
Conveyors with trippers conveyors mounted on gantries at an elevated height
Conveyors that operate in both directions.

Flat belt conveyor | Belt Conveyor Types

Flat belt conveyor is one of belt conveyor types is that in which the belt runs flat on the carrying side over straight roller type idler or a set of idlers.

Generally speaking, flat belt conveyor systems are utilized for the transportation of all kinds of packing or loose goods. A grip surface for inclines or a low friction quality, depending on the product's intended usage, may be obtained by finishing the belt with rubber, PVC or other suitable materials. There are a variety of materials available for frame construction, including mild steel with a powder coating or zinc coating, as well as stainless steel and aluminum.

Plastic boxes or cardboard, mattresses, electrical components, coiled wire, waste paper, chemicals, motors, and other items are among the products that are often transported on belts. It is possible to obtain a fixed or variable speed via the use of an externally mounted end drive unit or a motorized drum assembly. In order to provide reversing capability, a centrally placed underslung engine in combination with forward and reverse controls would be used.

Flat belt conveyors are suitable for lower capacity, low speed requirement and for handling unit goods or bulk material of small lump size and higher angle of repose. Declination is undesirable.

Belt Conveyor Layout | Horizontal Belt Conveyor | Inclined Belt Conveyor | Declined Belt Conveyor

noreply@blogger.com (Geetha) — Tue, 05 Oct 2021 06:56:00 +0000

Conveyor layouts:

Belt conveyors can be designed for practically any desired path of travel. It should be noted that transfer between conveyors should be avoided where possible due to additional wear on the belts at the loading points. Some of the profiles shown below:

Horizontal Conveyor

Decline Conveyor

Inclined Conveyor

Overland Conveyor

Belt Conveyor Idlers | Carrying Idlers | Return Idlers | Idler Spacing

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noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 09:22:00 +0000

Belt Conveyor parts:

The belt conveyor parts are explained below in this article. The belt support, the pulley, and the driving unit are the three major parts of belt conveyor. Each component is critical to the functioning of the conveyor unit and must be carefully selected. Despite the fact that all conveyor systems include these components, designs differ in terms of the materials used in construction and the location of each component.

The desirable properties of an ideal belt material are:

High Strength,
Low self weight,
Small specific elongation,
High Flexibility,
High resistivity to ply separation
Low hygroscopic
Long service life

What is a Conveyor System, and how does it work?

Loading and unloading conveyor systems are a kind of mechanical handling equipment used to transport materials from one location to another. Conveyors make it simple to move large or bulky items, which is particularly useful in applications such as material transportation.

Materials are transported quickly and efficiently using conveyor systems, which are available in a number of configurations. These are very useful in situations where there is a requirement to handle materials and move packing items on a consistent basis. It is common to see these at supermarkets and airports, and they often have user oriented transport applications.

Nowadays, there is a diverse range of conveying systems accessible to see and use, each tailored to the specific requirements of various sectors. Belt conveyors and chain conveyors are the most popular types of conveyors used in industrial settings. So let us have a look at the most important components of the conveyor system.

Belt Conveyor Parts

Belt Conveyors are made up of three components, which are as follows:

The belt as a support
The pulley system
The driving unit

1. The Belt as a Support

When it comes to conveyor systems, belt support is a component that enables the belt to travel smoothly and without any limitations.

It is possible for the belt to fail if the support unit is not solid, especially if a large item is placed on top of it. As a result, the belt will not travel as smoothly or as quickly as it should. The employment of support units helps to ensure that the belt stays tight and travels effectively.

2. Pulley System

The belt speed is controlled by this external component, which is called the pulley system. Each unit is equipped with two pulleys, one of which is powered by electricity and the other which is not. Furthermore, contemporary conveyor systems may have additional rotors across the whole frame.

3. The driving Unit

The drive unit is responsible for moving or operating the conveyor system. It is equipped with a counter bearing, which efficiently holds the moving components in place. For certain systems, it also allows for the movement of the belt in the opposite direction as well as the management of the frequent changes in the direction.

Conveyor System Types

There are many different types of conveyor systems and the Conveyor systems are classified into the following categories:

Ball transfer conveyor
Baggage conveyor
Belt conveyor
Bucket conveyor
Chain conveyor
Coal mine conveyor
Chute conveyor
Magnetic conveyor
Overhead conveyor
Pneumatic or vacuum conveyor
Powered roller conveyor
Roller conveyor
Screw or Auger conveyor
Slat or apron conveyor
Vertical conveyor
Vibrating conveyor
Wheel conveyor

1. Ball Transfer Conveyor

Ball transfer conveyors are made up of a number of ball rollers that enable the product to be transported in many directions at the same time. At packaging and assembly lines, when the product must be moved in more than one direction, they are used.

The usage of several conveyor lines in conjunction with one another is used to transfer goods from one location to another. This conveyor is capable of accommodating a variety of different sizes and load carrying capabilities. Ball transfer conveyors are not self-driven, and additional forces are required to move the product down the conveyor.

2. Baggage Conveyor

In bagging handling systems, these kinds of conveyors are utilized to move the bags from one location to another. It is likely that if you have gone to an airport, you are familiar with the fact that there are baggage claims where you may store your belongings.

You place your belongings on one side of the luggage conveyor, and they are collected on the other side once they have been checked. This causes the bags to travel in a circle. A conveyor belt is more likely to be seen at a shop or at an airport, among other places.

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3. Belt conveyor.

In transportation, a belt conveyor seems to be a carrying material that transports goods in a straight line or across changes in height or direction by use of a continuous belt. A conveyor belt is made up of two end pulleys that are looped over a lengthy stretch of thick material that is both strong and long-lasting.

The belt travels between the two as the motor in the pulley spins at the same speed and in the same direction as the belt goes between the two. For further support when carrying large or bulky goods or when transporting them over long distances, rollers may be placed on the sides of the conveyor belt to provide additional support.

A belt conveyor is the cheapest kind of conveyor, as well as the most straightforward to build and operate. It is used to transport bulk commodities such as grain, ore, coal, sand, and other similar items.

4. Bucket conveyor

A bucket conveyor is also referred to as a grain leg in certain circles. There are many types of conveyors that may be used to transport flowable bulk material vertically in an assembly line. It transports goods or commodities by use of multi-sided containers that are linked by cables, belts, or chains.

These conveyors are composed of an interlinked loop of buckets that stay flat as they travel from a horizontal to a vertical position in order to prevent their items from falling. These conveyors are simple to move, have a large carrying capacity, and need little maintenance. It is used in the food, agricultural, pharmaceutical, chemical, and glass sectors, among others.

5. Chain Conveyor

An automated chain conveyor is a material handling device that is connected to moving elements (such as a chain or cable) and is usually used to transport goods through manufacturing lines. A chain conveyor is made up of a succession of gears that are linked together to form a continuous system by a chain.

Typically, each gear includes teeth that allow it to rotate freely along the chain while it is being used. In addition to providing great load capacity, chain conveyors offer the capability of moving items that are very broad or lengthy in length. Chain conveyors are mostly used in the movement or transportation of large unit loads.

6. Coal mine conveyor.

Using these conveyors to carry huge amounts of coal over very long distances is a highly efficient method of transportation. Because of its low power usage, coal conveyor equipment may help you save money on your operating expenses.

Coal conveyors are more efficient than truck or rail systems in traversing steep terrain, and they have the added advantage of providing continuous transportation. It is appropriate for installation for coal handling at an inclination of up to 20° from horizontal, depending on the application.

7. Chute Conveyor

Chute conveyors are one of the most costly modes of material transportation available. When they transfer the goods from one level to another over smooth surfaces, they rely on gravity to do it. Chute conveyors are used to enhance the amount of space available for shipment.

A spiral chute may be used to transport items between levels while taking up the least amount of space possible. A low coefficient of dynamic friction is achieved via the use of certain materials, which allows the product or material to glide smoothly. It may be used in scrap handling, packing, and postal processing, among other things.

8. Magnet Conveyor

Ferrous material is moved vertically or in the opposite direction using these kinds of conveyor systems, which feature either a magnetic slider bed or a magnetic pulley as their primary moving components.

Magnets on the bed of this conveyor keep ferrous, or iron-containing components in place, and it should be able to operate on any industrial conveyor system. All of the magnets are properly positioned, resulting in precise magnetic holding power for these components. When ferrous chips are removed from machining centers, magnetic conveyors are utilized to do it.

9. Overhead Conveyors

An overhead conveyor is made up of a single track that may be operated manually or by a motor. These are utilized in work locations to carry out transporting and loading duties for employees. They are connected to the ceiling with the help of a trolley or carrier that is dragged by chains or cables to the desired location.

Conveyors of this kind are intended to move in a continuous route, and they may shift directions from horizontal to vertical or vice versa. This may allow you to make greater use of your floor space, transport goods in bulk, and send boxes or packing to your customers. The conveyor is mainly used in the inspection and/or processing of assembly line components.

10. Pneumatic or Vacuum conveyors

Unlike any other dry material transport system, a pneumatic vacuum conveyor is completely dust-free and requires no human intervention. A pneumatic conveyor operates on the premise that bulk goods may be transported via pipes using compressed air.

When this blowing air strikes the bulk material, it creates a propulsive force that propels the material through the conveying line. They need less maintenance and thus provide greater safety as well as reduced leakage and duct leaking. For example, burner feeders, metal powder carriers, and recycling all make use of pneumatic conveyors.

11. Powered or Live Roller Conveyor

These are the kinds of roller conveyors that transport goods or materials by using motorized rollers to move them. Conveyor rollers are powered by belts, chains, or O-rings, depending on the weight of the material being transported. Their effectiveness in horizontal transportation over vast distances is well documented.

The speed of the conveyor and the process can be readily regulated, and the danger of damage is minimized since the components never come into contact while in operation. They are mostly employed in the food processing, steel manufacturing, and packaging sectors.

12. Roller Conveyor

Roller conveyors are constructed with parallel rollers that are attached to the frame and are used to transport products by gravity or manually. Such rollers really aren't self-powered and instead rely on gravity to move the item, or on the user's physical assistance if they are placed horizontally.

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It is possible to install these kinds of conveyors in a straight or curved configuration based on the intended usage and available floor space. Because they are constructed with a range of sensors and technology, they are a highly quick and safe load transportation method. In the loading dock, baggage handling, or on the assembly line, it is utilized in a variety of situations.

13. Screw or Auger Conveyor

A screw conveyor is a device that moves or transfers fluid or granular material conveniently. It consists of a spinning helical screw blade connected to a uniform tube. Depending on the screw type and rotational orientation, it comprises of a helical screw or steel auger that spins inside a shaft, pushing the workpiece.

In this case, the rate of volume transfer is the same as the rate at which the shaft rotates. Conveyors of this kind are capable of handling huge amounts of material at varying speeds from sluggish to rapid flow. Among the items they transport are food waste, wood chips, cereal grains, animal feed, boiler ash, meat, and bone meal, to name a few examples.

14. Slat or Apron Conveyor

The slat conveyor transports items from one end of the conveyor to the other by use of a chain-driven loop of slats. A slat conveyor is a system that comprises of a slat and chain system that is used to move components down an assembly line.

The steel panels are linked in series by means of specific chain connectors, and the chain is driven by an electric motor and gearbox, as shown in the illustration. This enables a broad range of heavy-load conveyor applications to be implemented. In the heat drying process, a slat conveyor may transport hot, greasy components or objects through the process.

15. Vertical Conveyor

A vertical conveyor is a conveying equipment that automatically moves goods from one level to another by using rotary or linear vibration to move the products. They are capable of transporting products from one elevation to another, as well as increasing and decreasing the load in the supply line at different points along the way.

Vertical conveyors are placed between two horizontal conveyors and have the ability to keep the movement steady by using a vertical offset to keep the movement stable. Depending on the application, it may offer a variety of sizes and weight capabilities. Vertical conveyors are utilized in a variety of applications, including shrinking floor area, bundling several floors together, vertical accumulation systems, and many more.

16. Vibrating Conveyor

When a solid conveying surface is rotated sideways, the result is a trough, which is what a vibrating conveyor is used to transport. They are capable of transferring both static and dynamic forces to the structures that support them, depending on their design.

It is possible to transport materials downhill or horizontally on these conveying devices as well as up to 10 degrees of slope. Vibrating conveyors have smoother surfaces that are easier to clean and need less maintenance than other kinds of conveyors. They are used to transport dry, bulk commodities such as aggregate, gravel, coal, and other similar materials to their final destination.

17. Wheel Conveyor

An item is transported manually or by gravity on a wheel conveyor, which is supported by a frame and is made up of a succession of wheels. Depending on the weight requirements and application, a certain set of wheels and wheel spacing is used to construct this conveyor.

Wheel conveyors are utilized in a variety of applications such as item or package handling. They are often used for loading and unloading vehicles, as well as for transporting packages, pallets, and other items.

In general Reinforced Rubber Belts meet these requirements better than any other material.

In general, a conveyor belt consists of three elements:

Top cover
Carcass
Bottom Cover

Carcass | Belt Conveyor Parts

The carcass is the reinforcing element and takes up the tensile forces necessary in starting and moving the loaded belt, absorbs the impact energy of material during loading. The carcass may be of either textile reinforcement or steel cords. In case of textile reinforcement the carcass is normally built up of a number of plies of textile fabric. These plies may be made from rough woven cotton fabric and are connected by vulcanization with natural or synthetic rubber.

Sometimes the plies are made of extra strong synthetic fabrics like:

Capron,
Pernol
Nylon etc

The strength of fabric and the number of plies in the carcass of the belt may be varied together to suit the strength requirement. However if the belt is too tough, troughing of the belt and bending it round the terminal pulleys will be very difficult. Therefore the belt with lesser number of plies with stronger fabric is generally preferred because it is more flexible. Steel cord belting is used when good trough ability, small specific elongation and higher operating tensile forces are required. PVC belting is generally selected for underground mining applications where fire hazard exists.

Belts cover grades:

The primary purpose of the covers is to protect the belt carcass against damage and any special deteriorating factors that may be present in the operating environment. Rubber or rubbers like compounds are used for the top and bottom covers of conveying belting. Various chemicals are mixed with these compounds to achieve the desired physical properties necessary for service conditions. The properties needed for the cover of belt include resistance to cutting, gauging, tearing, abrasion, aging, moisture absorptions and in some cases resistance to oil, chemical and heat. Different qualities of cover material are designated by different grades. The cover grade is determined by the characteristics of the material to be handled.

Some cover grades are:

Grade M24:

Natural rubber compound offering superior resistance to cutting, gauging and abrasion wear

Grade N17:

Compounded rubber with improved flex life for moderately abrasive material, high abrasion resistance, resistance to cutting and gauging is inferior to M24

Grade HR:

Suitable for handling Alumina, ash, chemical etc at temperatures over 65 deg Celsius up to 120 deg Celsius.

Grade 'Betaplus':

Recommended for handling materials like foundry sand, cement clinker, coke wharf, sinter ore at temperature range 65 °C to 180° C for coarse and fine materials.

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Grade FR:

Suitable for underground mining and for equipment and materials requiring fire resistant and antistatic charge properties.

Grade OR:

Suitable for best possible resistance to mineral, vegetable and animal oil

Designation of Belts:

Belts are designated to denote the full thickness tensile strength per meter width and the number of reinforcing plies of synthetic textile. Examples: 500/3 belt indicates a belt having a minimum guaranteed full thickness tensile strength of 500 KN/m, incorporating 3 plies of textile reinforcement. For all synthetic fabric reinforced conveyor belting usually a factor of safety of 10 is applied to obtain the maximum working tension with vulcanized splicing.

Steel cord belting is designated by the prefix "ST" followed by the minimum full thickness tensile strength in kN/m.

Belt Splicing:

The two ends of a belt are joined directly on the conveyor either by vulcanizing or hinged metal belt fasteners of different designs. Vulcanization is the most reliable method of splicing. Vulcanization technique is a specialized job and expensive, but yields the best result. Mechanical fasteners are often used for connecting flat belting.

FAQ's

What are the different components of a conveyor belt?

When it comes to conveyor systems, there are three major components: the belt support, the pulley, and the driving unit. Each component is critical to the functioning of the conveyor unit and must be carefully selected. Despite the fact that all conveyor systems include these components, designs differ in terms of the materials used in construction and the location of each component.

What is the operation of a conveyor belt?

A conveyor belt operates by using two motorized pulleys that loop over a lengthy stretch of thick, sturdy material to complete the looping process. Whenever the motors in the pulleys run at the same speed and spin in the same direction, the belt is able to travel back and forth between them.

When it comes to a belt conveyor, which component is directly accountable for the material it transports?

One or both of the pulleys are driven, which causes the belt and the material on the belt to move forward as a result of this. The drive pulley is the one that is driven, while the idler pulley is the one that is not powered.

What kind of motor is used in a conveyor belt?

When it comes to conveyor systems that run constantly in one direction, AC induction motors are the best choice. There is a broad variety of AC motors with power-off triggered electromagnetic brakes available for conveyor systems in which the load should always be kept in place or for vertical applications.

What is the maximum speed of a conveyor belt?

Conveyors move packages at a pace that is comparable to that of a person who carries them. This is approximately 65 feet per minute (or around 3/4 mile per hour).

What exactly does "vulcanizing a belt" imply?

Hot vulcanizing is a technique of belt restoration that involves applying both heat and pressure to repair materials in order to attach them to the damaged portions of the belt. Before beginning, the belt must be well cleaned and clear of any oily or greasy particles.

How can I raise the speed of my conveyor belt?

The capacity of the belt may be enhanced by the following methods:

1. Increasing the breadth of the belts

2. Increasing the pace of the belts

3. Making use of idler geometry with increased capacity.

4. Making use of rubber with low rolling resistance; and

5. Increasing the strength of the belt.

What exactly is cold vulcanization?

A conveyor belt may be repaired using the cold vulcanising technique, which makes use of vulcanized material (chemical agents) such as patches and strips , which induce a chemical reaction to fuse the two belt ends combined.

What is the designation of belts?

V-belts, on the other hand, are specified with a nominal inside length. Each kind of belt segment has a power rating that is specific to it.

What is the definition of belt splicing?

Conveyor belt splicing is the technique of connecting two sections of conveyor belts together in one piece. The majority of the time, this is done in order to either lengthen the original conveyer belt or to repair a ripped or broken conveyor belt.

For high-temperature applications, what grade of belt cover is used?

Ultra heat resistant T3 Grade conveyor belts are intended for controlled high temperature applications. They are suited for continuous service at temperatures up to 180 degrees centigrade on the belt surface and 220 degrees centigrade for the material being transported.

What is the conveyor belt grade M24 designation?

M24 (24MPa) Conveyor Belts are abrasion resistant, as well as being very resistant to cuts and claw marks. Cement, steel, and stone crushing industries, among others, are major users of these materials in mining and process industries.

What kind of material is utilized in the construction of conveyor belts?

Rubber, PVC, Urethane, Neoprene, Nylon, Nitrile, Polyester, leather, and other materials are often used in the production of these belts. The material used to construct industrial conveyor belts is constructed in layers of several layers. The majority of material-transporting belts are constructed of two layers.

When a conveyor belt driving unit fails, what are some of the potential causes?

Uneven idler spacing, seized or worn rollers, a misaligned frame, material accumulation on any section of the conveyor, excessive belt tensioning, and a worn or broken belt are all potential reasons of mistracking, to mention a few of them.

Belt Conveyor Idlers | Carrying Idlers | Return Idlers | Idler Spacing

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Idlers:

Conveyor belts are usually supported on idler rollers. In some cases they are supported by solid wood or runway of steel sheet or a combination support comprising of the two types of supports placed alternatively.

There are two basic types of idlers:

Carrying idlers
Return idlers

Carrying Idlers:

The most commonly used type of carrying idlers used for handling bulk load consist of three in line idler rolls of equal length. The three equal length roll troughing idlers form the belt into the best troughed shape to carry a maximum load cross section.

For handling unit load or for handling nominal bulk load, or for supporting belt in return side, straight idlers are used, positioned between brackets attached directly to the conveyor frame. Another type of carrying idlers is used at the loading points where the lump size and the weight of the material ma seriously damage the belt if the belt were rigidly supported. Such idlers are called impact idlers. The most frequently used type of impact idlers consist of a three roll assembly, each roll being made of spaced resilient discs. These idlers are also known as cushion idlers.

Return idlers:

The return idlers which carry the weight of the empty belt in the return side or the lower side of the conveyor are mostly single roller straight idler. The main dimensions of the idler are the diameter and length. The diameters in millimeters of carrying and return idlers shall be selected from the following:

63.5, 76.1, 88.9, 101.6, 108, 114.3, 127, 133, 139.7, 152.4, 168.3, 193.7.

Idler spacing:

The spacing of idlers on the loaded run of the conveyor, carrying bulk material, depends on the belt width, the specific weight of the bulk material, the type of the idler. The spacing of the idlers in the loading zone of the belt is about half the normal spacing of idlers in the carrying side.

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A set of self aligning idler or training idler should be provided at the carrying side and return side at an interval of 15m on the carrying run and 30m at the return run. It consists of an ordinary troughed three roller idler mounted on swivel frame which is free to swivel within a limit about a vertical pivot. When the belt shifts off the crane the edge contacts on actuating roller with a slight pressure and this makes the idler take a skewed position when a force acts which tends to steer the belt back to its central position. As the belt returns to its central position, it automatically returns the idler to its initial position.

The idlers along the carrying and return side offer rolling resistance to the motion of the belt. It is taken into account by an artificial coefficient of friction, dimensionless, comprising of rolling resistance of the idlers along the carrying and return sides of belt and the belt advancement resistance. This coefficient of friction has a basic value of 0.02 for normally aligned belt conveyors and the same has a basic value of 0.012 for downhill conveyor requiring a brake motor.

The basic value of 0.02 of the coefficient of friction is only applicable to installations used at 70% to 110% of their nominal capacity, equipped with three roll carrying idlers for the upper side of the belt, a 30° side troughing angle, belt speed of about 5 m/s, surrounding temperature of about 20°C, and 108 to 159 mm diameter carrying idlers with ball bearing and labyrinth grease seals, together with idler spacing of 1.0 to 1.5m for the carrying side and 3 m for the return side of the belt.

Under favourable conditions, such as properly aligned installations with properly lubricated ball bearings, the value of the coefficient of friction may be as low as 0.016. For unfavourable conditions, such as poorly aligned belt conveyors with old bearings 'f' may be as high as 0.03.

Belt Conveyor Drive Arrangement | Belt Conveyor Design Calculation

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 09:19:00 +0000

Drive arrangement:

In belt conveyors the driving power is transmitted to the belt by the driving pulley which is rotated by an electric motor. The basic mechanism of transmission of power from the pulley to the belt is based on the theory of friction drive.

The fundamental equation for a belt conveyor drive is given by: (The Euler's equation)

T₁ ≤ T₂.e^µα

Where,

T₁ and T₂ are the tight side and slack side tensions of the belt at the driving pulley

α = wrap angle of the belt in radiation

e = Naperian base

µ = Friction factor

The peripheral effective pull T_E from a driving pulley, neglecting losses on the driving pulley due to belt stiffness is determined from the following reaction:

T_e= T₁ – T₂

T_2min > T _{E Max} (1 / (e^µα -1))

Where,

T _{E Max}is the maximum effective peripheral pull in N, which often occurs when starting up or when braking the completely loaded conveyor.

In other conditions T_e is the average effective pull. Maximum effective pull is usually 20% to 50% more than the average effective pull, depending on the type of motor starter and coupling.

Table: Coefficient of friction between driving pulley and rubber belting type of pulley lag

Operating conditions	Smooth bare steel pulley	Rubber lagging with herring bone grooves	Polyurethane lagging with Herring bone grooves	Ceramic lagging with Herring bone grooves	PVC belt
Dry	0.35 to 0.4	0.4 to 0.45	0.35 to 0.4	0.4 to 0.45	0.25 to 0.35
Clean wet (Water)	0.1	0.35	0.35	0.35 to 0.4	0.15 to 0.3
Wet and dirty ( Clay or Loam)	0.05 to 0.1	0.25 to 0.3	0.2	0.35	Less than 0.25

The value of α depends on the particular drive system selected and may range from 180° to maximum 440°.

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Minimum belt tension

T = 4.2 P_c ( W_b + W_m )

Where,

P_c = idler spacing on the carrying side

Types Of Belt Conveyor Drives | Belt Conveyor Drive Arrangement

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 09:17:00 +0000

Types of Belt Conveyor Drives:

Single Unsnubbed Bare / Lagged pulley Drive
Snubbed Bare / Lagged Pulley Drive
Tandem Drive
Special Drives

Single Unsnubbed Bare / Lagged Pulley Drive:

This is the simplest drive arrangement consisting of a steel pulley connected to a motor and the belt wrapped round it on an arc of 180°. This can be used for low capacity short center conveyors handling non-abrasive material. The pulley may be lagged to increase the coefficient of friction.

Snubbed Bare / Lagged Pulley Drive:

Here the angle of wrap is increased from 180° to 210° or even up to 230°, by providing a snub pulley to the driving pulley. In majority of medium to large capacity belt conveyors, handling mild abrasive to fairly abrasive materials, 210° snub pulley drive with load pulley lagged with hard rubber is adopted.

Tandem drive:

Here belt tension estimated to be high; the angle of wrap is increased by adopting tandem drives. Both of tandem pulleys are driven. The tandem drive with arc of contact from 300° to 480° or more can operate with one or two motors. The location of such drive is usually determined by the physical requirements of the plant and structural constraints.

Special Drive:

Special drives with snub pulleys and pressure belts used in heavy and long conveyors.

Pulley | Belt Conveyor Pulley | Belt Conveyor Pulley Types | Belt Conveyor Power Calculationv

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 09:14:00 +0000

Pulley Belt Conveyor

Pulley:

The diameters of standard pulleys are: 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1400 and 1600 mm. pulley may be straight faced or crowned. The crown serves to keep the belt centered. The height of the crown is usually 0.5% of the pulley width, but not less than 4 mm. The pulley diameter D_p depends on the number of plies of belt and may be also be determined from the formula:

D_p > K.i (mm)

Where

K = a factor depending on the number of plies (125 to 150)
i = no of plies

The compound value should be rounded off to the nearest standard size. While selecting the pulley diameter it should be ascertained that the diameter selected is larger than the minimum diameter of pulley for the particular belt selected.

The drive pulley may be lagged by rubber coating whenever necessary, to increase the coefficient of friction. The lagging thickness shall vary between 6 to 12 mm. The hardness of rubber lagging of the pulley shall be less than that of the cover rubber of the running belt.

Pulley types:

Pulleys are manufactured in a wide range of sizes, consisting of a continuous rim and two end discs fitted with hubs. In most of the conveyor pulleys intermediate stiffening discs are welded inside the rim. Other pulleys are self cleaning wing types which are used as the tail, take-up, or snub pulley where material tends to build up on the pulley face. Magnetic types of pulleys are used to remove tramp iron from the material being conveyed.

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Typical welded steel pulley-Drum conveyor pulley

Spun end curve crown pulley

Spiral drum conveyor pulley

Welded steel pulley with diamond grooved lagging

Welded steel pulley with grooved Lagging

Spiral Wing Conveyor pulley

Power calculation for the drive unit:

The horse power required at the drive of a belt conveyor is derived from the following formula:

H.P = T_e . V

Where

T_e is the effective tension in the belt in N
V = velocity of the belt in m/s

The required effective tension T_e on the driving pulley of a belt conveyor is obtained by adding up all the resistances.

Conveyor Take Up Arrangement | Take Up Pulley | Screw Take Up Conveyor | Quick Take Up Master Cylinder

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 09:09:00 +0000

Conveyor Take up Arrangement:

All belt conveyors require the use of some form of take-up device for the following reasons:

To ensure adequate tension of the belt leaving the drive pulley so as to avoid any slippage of the belt
To ensure proper belt tension at the loading and other points along the conveyor
To compensate for changes in belt length due to elongation
To provide extra length of belt when necessary for splicing purpose.

Conveyor Take Up Types

Usually there are two types of Conveyor take up arrangements.

Fixed take up device that may be adjusted periodically by manual operation
Automatic take up devices for constant load type

Why Conveyor take up assembly required?

Conveyor take up is the tensioning of a conveyor belt. This avoids damage to the conveyor belt and other equipment as well as premature component wear.

This component is designed to regulate the tension of a conveyor belt. The design of this component varies depending on the conveyor system, but typically, it consists of a metal frame that connects to the conveyor frame, and one or more adjustment screws that move one or more cylinders.

Chain Conveyor Take Up

The conveyor take up may also be used to alter the tension of a drive system chain. As the chain stretches or wears from frequent usage, it must be adjusted.

Taking a link out of the chain may modify the conveyor take up, however it may create uneven wear or incorrect chain length. The conveyor pick up component adds or releases pressure on a chain guide pulley.

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Take Up pulley Belt Conveyor

When using the take up component to modify the belt tension, several units may be utilized. Each unit will be placed on each end of a customized take-up pulley. When the conveyor take up bolt is rotated one way, more tension is applied to one side of the pulley, and when it is moved the other way, less tension is added.

Belt Conveyor Take up system is used for tensioning the belt

The belt tension may be adjusted on either side of the pulley. To maximize adaptability, the pulley is typically placed out of line with the other cylinders or pulleys.

Advantages of Conveyor Take Up

Using a conveyor take up may prevent several kinds of harm. A belt that is overly tight may break or wear out prematurely, causing system failure. If it's too loose, it'll slide on the cylinders, preventing efficient belt movement. A slack belt may cause excessive wear and can become trapped in other conveyor components.

Conveyor Take Up pulley is used to adjust to new position

Conveyor Take up Bearings

In a screw take up system the take up pulley rotates in two bearing blocks which may slide on stationery guide ways with the help of two screws. The tension is created by the two screws which are tightened and periodically adjusted with a spanner. It is preferable to use screws with trapezoidal thread t decrease the effort required to tighten the belt.

Conveyor Take up system

The main problem with the use of manual take-up is that it requires a vigilant and careful operator to observe when take up adjustment is required. Perfect tension adjustment with this system is also not possible. For this reason these devices are used only in case of short conveyors of up 60 m length and light duty.

Automatic Take Up arrangements

In automatic take up arrangement the take up pulley is mounted on slides or on a trolley which is pulled backwards by means of a steel rope and deflecting pulleys. The carriage travels on guide ways mounted parallel to the longitudinal axis of the conveyor, i.e., horizontally in horizontal conveyors and at an incline in inclined conveyors. Hydraulic, pneumatic and electrical take up devices are also used.

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Automatic take-up has the following features:

It is self adjusting and automatic
Greater take-up movement is possible

Screw Conveyors | Screw Conveyor Working Principle And It’s Critical Components | Basic Screw Conveyor Systems Design

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 09:03:00 +0000

Screw Conveyors

Screw conveyors were used as low height lift pump to irrigate the lands. It comprises of an inclined rotating casing with an internal helical screw thread, called flight. When such a casing is rotated with its lower end submerged in water, the water entrained in the pockets, formed by the pitches, is raised. The performance of such screws is limited by the angle of inclination of the casing.

A modified version of such screws have been tried with a rotating shaft having helical screw thread moving inside a stationery casing for lifting fluids like sewage sludge. But due to various limitations the process achieved limited success in the field of transportation of liquid. However when a rotating screw shaft in a stationery casing is used to convey solids, it has commendable success.

History of Screw Conveyors

What Archimedes invented early in history remains one of the best most flexible methods accessible to processors for transferring materials in a confined environment. Moreover, Archimedes' screw serves as the basis for systems that transport a wide variety of goods, ranging from dry as well as free-flowing to moist, sticky, and viscous. Although it may move items horizontally, vertically, or at an incline, the vast variety of configurations, components, and construction materials available on this conveyor allow it to handle even the most difficult materials and application requirements. Due to its flexibility, screw conveyors are the most frequently used mechanical bulk solids conveyors on the market.

Screw Conveyor Hanger Bearing

Essentially, bulk materials are fed into the screw conveyor via the bottom of the housing, where they are sheared and moved ahead with each rotation, bringing the product closest to its desired location. A conventional screw conveyor comprises of flights placed on a pipe inside an enclosed housing, which is supported by bearings. Although U-shaped housings are the most popular, some applications may necessitate the use of tubular troughs. One or more screw pieces may be used in an installation to cover the required distance. Hanger bearings hanging from the top of the trough may hold numerous screws between each segment of a longer conveyor.

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Increasing the pipe diameter or allowing the screws to ride in a specific liner placed in the housing are the two additional methods of covering greater distances without experiencing excessive deflection. The screw conveyor's intrinsic architecture allows for the provision of numerous input and discharge locations, if necessary, depending on the application.

Screw Conveyors fabrication

Screw conveyors are completely covered with trough covers to ensure the safety of the operator and the containment of material. The most successful method of obtaining a tight seal on a screw conveyor is to use a flanged cover fastened on 12-in. (or closer) centers in conjunction with a high-quality compressible gasket between the trough and the cover. Gasket material is offered in two colors: black for normal applications and white for hygienic applications such as chemical, food, and other sanitary environments.

The cover is made of stainless steel or carbon steel to match the materials used in the trough's construction; the thickness of the steel used in the cover, as well as its turned-down edges, offer stiffness, which improves the cover's capacity to close the trough. Thick coverings that offer extra stiffness may be required for situations that are very dusty.

Industries which uses a Screw Conveyors

There are numerous applications, including numerous ones in the chemical manufacturing industry, that necessitate the use of screw conveyors with specialized configurations and structural materials in order to reduce maintenance requirements, operating costs, and the incidence of sudden and unexpected equipment failure.

Floor mill industry was probably the first to employ horizontal screw conveyor to convey corn and flour. These screws were made by fitted wood blades to a central shaft rotating inside a cylindrical casing. Even now such screw conveyors enjoy popularity in agro based industries, handling grains and flours, because of low friction, negligible cohesive strength of the material.

Screw Conveyors Design

Screw Conveyors consists of a steel tube in the design of a U – shape. For transporting to the discharge stage, two or more tubes may be joined together.

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A screw conveyor consists essentially of a shaft mounted screw rotating in a trough and a drive unit for running the shaft. The material is moved forward along the axis of the trough by the thrust of screw thread or flight. The trough is usually of the U-shape.

A helical blade is attached to a drive shaft which is coupled to a drive unit. The shaft is supported by two end bearings and intermediate bearings. The U-shaped trough has a cover plate with an opening for loading the conveyor. A discharge opening is provided at the bottom of the trough. The loading and discharging points can be located anywhere along the trough. More than one feed hopper and discharge hopper may be fitted according to the necessity.

Evaluating the demand load based on the material properties and choosing the right screw conveyors (trough, pipe, flights, shafts, bearings, and motor – driven controls) is critical for an accurate screw conveyor design. A screw conveyor that has been correctly built and constructed should be able to meet the demands of any demanding application for many years.

Screw conveyors, like many other kinds of rotating equipment, need precise alignment in order to operate well and for an extended period of time. The most straightforward method of checking alignment is to use a string. Fasten the string line to one end of the screw conveyor at the trough-end centerline, and then draw the string line tight to the other end of the screw conveyor to complete the installation. The misalignment of the trough portions will be seen as a result of this.

The screw conveyor's whole length must be aligned, both horizontally and vertically, to ensure proper operation. Every five feet, you should use a measuring tape to check for misalignment in both the horizontal and vertical directions. In the horizontal direction, taking a horizontal measurement from the string line to the edge of the trough reveals that the screw conveyor is out of alignment in that direction. In a similar vein, measuring the distance between the string line and the bottom of the trough flange yields the vertical misalignment.

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Each horizontal and vertical measurement should be documented. The relative discrepancies in the measurements show how far each trough section has to be moved in order to ensure appropriate alignment with the others.

Screw conveyors that are longer than, say, 25 feet may cause a typical misalignment issue with numerous hanger bearing positions, which is a prevalent difficulty in the manufacturing industry. Because the screw is locked at the bearing sites, misalignment results in the application of bending loads at the hanger positions, which are promptly reversed with each rotation. Misalignment results in the application of bending loads at the bearing locations. When these cyclical pressures are applied, the result is comparable to the effect of repeatedly twisting a paperclip until it snaps in half. Cyclical loading identifies the screw's weakest zone, which is often located near to the hanger bearings and in the screw bushing region, and places it under tension.

The principle of material movement along the trough is similar to the sliding motion of a nut along a rotating screw when the nut is not allowed to rotate. The weight of the material and the friction of the material against the wall prevent the load from rotating with the screw.

10 Fundamentals About Screw Conveyor Working | The Complete Beginner’s Guide to Screw Conveyor Applications | Screw Conveyor Pdf

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 08:57:00 +0000

Screw conveyor Working and Applications:

Screw Conveyor applications are required in Food, Pharmaceuticals, Chemical industries, Packaging industries, salt, cement, coal, biomass, agriculture, gypsum and other industries where there is a need for industrial duty equipment to convey free-flowing bulk materials. Screw Conveyors are used in a wide variety of applications to efficiently convey dry, free-flowing, semi-fluid and sticky bulk materials. These conveyors are employed for handling a great variety of materials which have relatively good flowability. Sticky and stingy materials are unsuitable for screw conveying.

Screw conveyors have a few favourable points to its credit for recommending its application in different industries. Simplicity of design, easy construction and maintenance, are the few points which are often mentioned in favour of its application. But material characteristics often dictate the choice of its selection.

Dusty, hot materials or materials having foul odour are often conveyed by this type of conveyor systems, because it can be easily made dust-proof by jacketing the trough.

Typical applications include grain storage plants, feed mills, cereal processing plants, chemical plants, and sand preparation shop of a foundry for delivery of clay to the mixing machines.

Screw conveyors are very suitable for being adopted as a device to control the volume of materials flow from the bottom of bins, hoppers, storage silos etc. when screw-conveyors are used for this purpose they are termed as screw feeders. Screw feeders have wide applications for the operation of processing units like driers, hammer mills, oil expellers and other innumerable mills.

History of the Screw Conveyor

Archimedes designed the first screw-conveyor in the third century B.C. It was used for removing water from ships and for irrigating farmland. The device consisted of a hollow cylinder with a center shaft and a spiral fixed to the inner wall of the cylinder and center shaft. As the assembly rotated, water was conveyed and lifted from one location to another. The spiral design is based on the theory of the inclined plane.

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The screw-conveyor began to evolve in the late 1800s and was used as a means of increasing feed and grain production to serve the needs of the rapidly growing American population. The first feed mills utilized screw-conveyors throughout the process. Even the most modern feed mills today depend on screw-conveyors for many of their material handling requirements. The screw-conveyor has evolved to modern times. It is now used in almost every major industry.

Screw Conveyor Operation

The flexible screw-conveyor operation begins with product entering the sealed tube as the auger rotates. The shape, design style, size, and length of the auger are factors selected for each application. The screw-conveyor is typically mounted to a hopper for easy loading of material. A single motor drives the auger rotation allowing the material to be pulled through the enclosed tube. The helicoid design of the auger effectively conveys a wide range of materials from powder, to granular, to larger particles.

Screw conveyor rotation- Screw conveyor rate

Screw-conveyors may be used to convey materials which can be subjected to thermal operation during transit. The conveyor trough is provided with jacket through which the heating or cooling medium may be circulated to effect the thermal operation.

Screw-conveyors may be operated horizontally, on an incline, or vertically. Often inclined conveyors can solve a transportation problem effectively, but otherwise a combination of horizontal and vertical units should be installed. The angle of inclination of inclined conveyors is usually 10° to 20°. Vertical conveyors are usually complex in design and should be run at faster speed.

Screw-conveyors do not always get favourable consideration due to high friction of the material against screw and trough, probability of material degradation due to crushing of material and due to higher power consumption resulting from higher friction. Therefore screw-conveyors have limitation in capacity and distance of conveying. They are suitable for low and medium capacities for short distance. Capacity may be as high as 100m³/hr and distance of conveying is of the order of 30 to 40m typically.

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Screw conveyor Applications:

Screw conveyors are bulk material transporting devices capable of handling great variety of materials which have relatively good flow ability. This characteristic is important in screw-conveyor operation as the screw helix mounted on a central pipe or shaft, rotates within a fix trough or tube, pushes the material along the bottom and sides, sharing the material in the radial clearance between the helix and trough and causing the material to tumble upon itself as the moving face of the helical flight tends to lift the material.

Screw Conveyor Applications Gallery:

Bag-dump-station-screw-feeder-for-mixer-filling

Big-bag-discharge-station-screw-conveyor

Continuous-feeding-by-screw-conveyor

Silo-discharge-and-powder-process-feeding-screw-conveyor

Screw Conveyor Advantages:

The screw-conveyor has many advantages over other types of bulk material handling equipment. Some of the advantages are:

Screw-conveyors are capable of handling a great variety of bulk materials from sluggish to free-flowing.
Screw-conveyors can have multiple inlets and discharge points. Bulk materials can be conveyed and distributed to various locations as required. Slide gates or valves can be added to control the flow into and out of a screw conveyor.
When a screw conveyor is used as a metering device, it is considered a screw feeder. Screw feeders are used to initiate a material process by metering product from a bin or hopper.
Screw-conveyors are very compact and adaptable to congested locations. Screw conveyors do not have a return similar to a belt or drag conveyor.
Screw conveyors are totally enclosed to contain the product and prevent spillage. Screw conveyors can be utilized in the horizontal, vertical or any inclined position depending upon the characteristics of the product being conveyed.
Screw conveyors can be used for mixing various products together and for breaking up large lumps.
Screw conveyors can be designed without a center pipe. This type of conveyor is called a shaftless screw conveyor and is designed for conveying wet, sticky, sluggish products such as industrial sludges and biosolids.
Screw conveyors can be used to cool, heat or dry products in transit. Depending on the heat transfer requirements, a screw conveyor can be jacketed, or a hollow-flight design utilized to provide the necessary heat transfer for the application.
Screw conveyors can be designed to be vapor-tight or hold an internal pressure. This is very important when conveying toxic or hazardous products such as those in the chemical industry.
Screw conveyors can provide an airlock between upstream and downstream equipment.

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8 Go-To Resources About Screw Conveyor Flight Types | Helicoid Screw Flight | Ribbon Flight Conveyor System: It’s Not as Difficult as You Think

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 08:51:00 +0000

Screw Conveyor Flight Types

The screw of the conveyor flight may be right hand or left hand, the right hand type being the usual design. The threads of the screw may be single, double or triple.

The flight of the screws may be made in either of the two ways:

1. As Helicoids
2. As Sectional flight

Helicoids Flight | Screw conveyor Flight types:

They are formed from a flat bar or strip into a continues helix. The threads are thinner at the outer edge and thicker at the inner edge.

Sectional flights | Screw conveyor Flight types:

Sectional flights are formed from a flat disc and the thickness of the thread is uniform throughout. A continuous helix is made by joining a number of sectional flights together on a piece of pipe and butt welded them. Various styles of screw flights are in use, depending on the service required.

Some of the typical configurations in screw conveyor Flight types are:

1. Short pitch or continuous flight | Screw conveyor Flight types:

If the conveyor is required to handle dry granular or powdered materials that do not pack, this style of flight may be selected. It is of regular construction and recommended for inclined conveyors having a slope of 20 or more, including vertical conveyors. This style is extensively used as feeder screw.

2. Ribbon flight | Screw conveyor Flight types:

If the conveyor is to handle lumpy, clinging, sticky, gummy or viscous substances, this type flight may be selected. It consists of continuous helical flight formed from steel bar and secured to the pipe by supporting lugs.

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3. Cut Flight | Screw conveyor Flight types:

In this type of flight screws have notches cut in the periphery of the flight. These notches supplement the conveying with moderate mixing action. They are recommended for conveyors required to handle light, fine, granular or flaky materials.

4. Cut and folded flights | Screw Conveyor Flight Types:

This type of flight is characterized by notches as in cut flight, together with folded segments. This type of flight creates agitation and aeration resulting in better mixing. This type of flight is used to handle light or medium weight materials having fine, granular or flaky materials.

5. Some screw conveyors have cut flight with paddles mounted at regular intervals. The paddles counteract the flow of material past the flight resulting in greater agitation and mixing.

6. Sometimes screws are made of stainless steel to suit special requirements, like the sanitation requirements for handling food, drugs and other hygienic materials.

7. Standard Screw conveyor flight | Screw conveyor Flight types – Screws sectional flight with a pitch spacing equal to the diameter are considered standard and are suitable for most screw conveyors of conventional horizontal design.

Standard-screw-conveyor-flight-design

8. Screw conveyor tapered flight | Screw Conveyor Flight types – Tapered flight spirals provide a continuous incremental change in swept volume of the screw conveyor auger. This promotes even draw down in a full hopper situation. Tapered flights leave residual material in the screw conveyor unless the casing is tapered to suit.

Screw-conveyor-tapered-flight

9. Screw conveyor short pitch flight | Screw Conveyor Flight Types – Short pitch screws are used in inclined screw conveyors. They are also used to control the feed at the inlet and to reduce flushing of free flowing materials. The shorter the pitch the more efficient is the screw augers.

Screw-conveyor-short-pitch-flight

10. Screw conveyor paddles | Screw Conveyor Flight Types – Paddles are set in a helical form around a square or round center tube to form a segmented spiral. They are used in mixers and pug mills to mix and condition dry products when liquid is added during the process.

Screw-conveyor-paddles

11. Variable pitch flights | Screw Conveyor Flight Types – The screw conveyor with Variable pitch flights are used to control the amount of material drawn down along the length of a hopper. By increasing the pitch at each flight along a screw you can incrementally increase the volume of product that is allowed to enter the screw.

Variable-pitch-flights

12. Screw conveyor double start flight | Screw Conveyor Flight Types – The screw auger conveyor with Double start flights are used to accelerate the conveying process at the conveyor inlet and even out the pulsing effect at the outlet. They are also typically used in drilling and post-hole augers to equalize the torsional forces on the screw auger.

Screw-conveyor-double-start-flight

13. Screw conveyor notched and folded flights – The screw augers with Notched and folded flights provide a more aggressive mixing action where material that passes through the notch is lifted and mixed with the trailing material. They can also be used for aerating or cooling materials.

Screw-conveyor-notched-and-folded-flights

14. Screw Conveyor Notched Flight – The screw conveyors with Notched flights are used to provide a gentle mixing action. Notched flights are useful in blending different materials during the conveying process.

Screw-conveyor-notched-flight

15. Screw Conveyor Center-less Flights (Shaft-less) – The Screw conveyor Center-less flights (Shaft-less) are used for extremely sticky or fibrous materials that tend to wrap around or build up on a center pipe.

Screw-conveyor-centreless-flights-shaftless

16. Screw conveyor hollow spiral flight – The screw conveyor with Hollow spiral flights are used to pass heating or cooling liquids around the helix. Typically both the hollow center pipe and the hollow spiral flight are used as a heat exchanger to cool, heat or thaw the material being conveyed.

Screw-conveyor-hollow-spiral-flight

17. Screw conveyor ribbon flight – The screw conveyor with Ribbon flights with integral support legs are used for sticky or cohesive materials that tend to build up on the flight-pipe interface.

Screw-conveyor-ribbon-flight

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18. Screw conveyor Coned flight | Screw Conveyor Flight Types – The screw conveyor conical flight centers provide a continuous incremental change in swept volume of the screw. This promotes even draw down in a full hopper situation. Combined with variable pitch the coned screw provides the best possible solution to even hopper draw down. Standard troughs can be used with coned flights.

Screw-conveyor-coned-flight

Design of Screw Conveyor | 40 Ways To Eliminate Your Fears and Doubts About Size of Screw Conveyor | Screw Conveyor Capacity Calculation | Screw Conveyor Design Calculation

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 08:45:00 +0000

Design of Screw Conveyor:

The size of screw conveyor depends on two factors

1. The capacity of the conveyor

2. The lump size of the material to be conveyed (Maximum dimensions of the particle)

For the transportation and dispensing of bulk materials, screw conveyors are one of the most often used machinery. The size of a screw conveyor must be calculated in numerous projects in order to attain the required capacity. An existing screw conveyor's capacity might need to be checked in the event that material handling or capacity requirements change. From this brief engineering reference, some few formulas are explained.

Screw conveyors are a convenient, economical, and extremely efficient means of transporting the goods, when the conveyor is properly constructed or designed, according to the consumer requirements. Material flow rate, material dispensing, and overworking of the motor are all governed by the screw conveyor's design and construction. Consider the following methods and techniques for screw conveyor design, in more detail.

Screw Conveyors Have a Long History

The screw conveyor was invented by Archimedes in the 3rd century B.C. The first screw conveyor was used to irrigate crops and remove water from ships. Spiral flights were attached to the inner wall of a hollow cylinder and were powered by a central shaft in the initial model. Water was transported and raised from one point to the next as the assembly revolved. The spiral project is focused on the inclined plane principle. In contemporary times, the screw conveyor has evolved and is currently utilised in virtually every major sector.

Selection of Screw Conveyor

Screw conveyors are constructed with a central shaft encircled by screw flights as its fundamental design. This mechanism is enclosed by an enclosure that is open on both ends, allowing materials to be collected and discharged from it. While screw conveyors and screw feeders have a similar architecture, screw conveyors are intended to move material from one area of the process to another, while screw feeders are intended to measure the material as it passes through the process.

Internal Parts of Screw Conveyor

Many different screw conveyor designs are available for customization. The following are a few examples of how screw conveyor designs may be tailored to meet the specific requirements of a particular application or material. Please keep in mind that this is not a comprehensive list; there are additional methods to modify the screw conveyor to suit your specific material handling requirements.

Pitch is the distance between the screw flights on a given screw.
Shaft refers to the size of the central shaft, or the lack of a central shaft.
Construction: the materials used to construct the enclosure, shaft, flights, and other components.
Capacity is measured by the amount of material that can be moved via a screw conveyor in a given amount of time.
The speed at which the screw conveyor travels is referred to as the screw conveyor speed.
The conveyor's entire length is referred to as its length.
Incline: whether or not the conveyor must travel a vertical distance, and how much distance it must travel.

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There are many reasons and applications which require variation to standard screw conveyors. These are just some of the factors and conditions that will influence the design and construction of a screw conveyor.

What material will be conveying?
What are the material characteristics?
What is the bulk density of the material?
What through put capacity is the screw to be designed for and at what housing loading?
Where will the material be coming from?
Is the screw to be a feeder or a conveyor?
Is the screw horizontal, incline or vertical?
Is the screw reversing?
How long will the screw be centreline of the inlet to the centerline of the discharge?
Are intermediate hanger bearings for the screw acceptable?
Housing construction information
- Material of construction
- Dust tight construction
- Pressure tight construction (i.e. Will the housing have to hold pressure)
- Will the housing requires a 'code stamp'?
- Will the equipment be in wash down service?
- Hinged covers?
- Tubular or "U" trough housing?
- Type of shaft seals?
- Food grade polish
- Welding requirements
- How is the housing supported?
What is the inlet size that we are connecting to and how many inlets are there?
What is the discharge size that we are to connect to?
Is the discharge a drop out, injector style or positive feed?
Is there more than one discharge called out and do they have slide gates?
What style are the slide gates and how are they operated?
Is the screw service continuous, 8 hour a day, 24 hour a day, batching, intermittent etc?
If there is more than one screw to a housing, how many drives?
Is the screw to be portable?
Will the screw be required to dewater or drain product?
Will the screw be required to mix product while conveying?
Will the product be abrasive?
What material of construction in product contact?
What type of welding in product contact?
What finish or polish is required in product contacts?

Components of a Screw Conveyor

Material Characteristics of Screw Conveyors

The properties of the materials being carried have a major effect on the design of the screw conveyor. Various material qualities may have an effect on the design in a variety of ways, the most significant of which are listed below:

Flowability

Materials that flow smoothly will need less energy to move and will move more quickly. The power required to move materials that are thick and sluggish will be greater, and the materials will move more slowly.

Corrosive

It is possible for corrosive elements to eat away at a screw, shaft, and trough enclosure when they're not constructed from a resistant material. When dealing with corrosive compounds, some stainless steel grades or nickel alloys are the best options available.

Abrasive

Friction may eventually wear out at the screw, shaft, and enclosure as a result of the use of abrasive materials. Screw conveyors will benefit from the use of abrasion-resistant metals, which will assist to strengthen them.

The Angle of Repose

At different inclination levels, the angle of repose has an effect on the flow of the material. This will be especially essential if the screw conveyor is responsible for delivering goods across a vertical and horizontal range of distances.

Features that distinguish them from the other Material properties

Many specific features, such as levels of moisture or oil, agglomeration, toxicity, adhesion, dustiness, flammability, explosiveness, and other attributes, may have an impact on the functioning and design of a screw conveyor.

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Flight Pitch, Number, Paddles, and Other Details

Pitch on the screw conveyor flights is an essential factor to take into account. Assuming the feeder is fully extended, the distance between each flight is equal to the diameter of the feeder. When the pitch is half pitch, the distance between the flights is equal to half the diameter of the feeder's diameter. If the pitch of the flights is the same throughout the board, pressure may build up towards the end of the conveyor's length. The pitch may also have an effect on how much material flows through the feeder at any one time.

There are a variety of options for customizing the screw conveyor pitch in order to accommodate the material properties, including the options listed below:

Types of Screw Flights

Progressive or Variable Pitch

A progressive or variable pitch is usually used for pulling items out of a hopper in an even and consistent manner. It is necessary in this situation to extend the distance between the flights in order to pull the material out of the hopper.

Double flight

A double flight is an additional spiral-shaped component that is added around the shaft to enhance the conveying power or quantity even more. Double flight screw conveyors are also available in progressive or variable pitch configurations.

Paddles

The use of paddles between screw flights may aid in the creation of a more gentle mixing and conveying action on the screw. This is particularly beneficial for materials that are brittle or fibrous, as well as those that cluster easily.

Ribbon flight

The difference between a normal screw flight and a ribbon flight is that a typical screw flight is solid all the way through, while a ribbon flight contains gaps between the flight and the shaft. This makes it easier for sticky or viscous items to pass through the screw conveyor with less difficulty.

Screw conveyor design may be tailored to your specific needs to help prevent material from being trapped in the conveyor, avoid overworking the motor, and prolong the conveyor's usable life. Consider your materials, processes, and facility layout before collaborating with a seasoned manufacturer to create the perfect screw conveyor for your application.

Usually there are three ranges of lump sizes which are considered for selection of screw size. These are:

· A mixture of lumps and fines in which not more than 10% are lumps ranging from maximum size to one half of the maximum, and 90% are lumps smaller than one half of the maximum size.
· A mixture of lump and fines in which not more than 25% are lumps ranging from the maximum size to one half of the maximum, and 75% are lumps smaller than one half of the maximum size.
· A mixture of lump only in which 95% or more are lumps ranging from maximum size to one half of the maximum size and 5% or less are lumps less than one tenth of the maximum size.

The allowable size of a lump in a screw conveyor is a function of the radial clearance between the outside diameter of the central pipe and the radius of the inside of the screw trough, as well as the proportion of the lumps in the mixture.

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The lump size of the material affects the selection of screw diameter which should be at least 12 times larger than the lump size of a sized material and four times larger than the largest lumps of an un-sized material.

Example, if screw diameter is 250mm means radial clearance is 105mm, & Maximum lump size is 60mm of 10% lumps.

Capacity of Screw Conveyor:

The capacity of a screw conveyor depends on the screw diameter, screw pitch, speed of the screw and the loading efficiency of the cross sectional area of the screw. The capacity of a screw conveyor with a continuous screw:

Q = V. ρ

Q = 60. (π/4).D².S.n.ψ.ρ.C

Where,

Q = capacity of a screw conveyor

V = Volumetric capacity in m³/Hr

ρ = Bulk density of the material, kg/m³

D = Nominal diameter of Screw in m

S = Screw pitch in m

N = RPM of screw

Ψ = Loading efficiency of the screw

C = Factor to take into account the inclination of the conveyor

Design of Screw Pitch for Screw Conveyor:

Commonly the screw pitch is taken equal to the diameter of the screw D. However it may range 0.75 – 1.0 times the diameter of the screw.

Design of Screw Diameter for Screw Conveyor:

Nominal Size D	Trough height from center of screw shaft to upper edge of the trough	Trough width C	Thickness of Tough	Tubular shaft (d1 * Thickness)	Outside diameter of solid shaft	Coupling diameter of shaft
Heavy Duty	Medium Duty	Light Duty
100	63	120	–	2	1.6	33.7*2.5	30	25
125	75	145	–	2	1.6	33.7*2.5	30	25
160	90	180	5	3.15	1.6	42.4*2.5	35	40
200	112	220	5	3.15	2	48.3*3.5	40	40
250	140	270	5	3.15	2	60.3*4	50	50
315	180	335	5	3.15	–	76.1*5	60	50
400	224	420	5	3.15	–	76.1*5	60	75
500	280	530	5	3.15	–	88.9*5	70	75

RPM of Screw:

The usual range of RPM of screw is 10 to 165. It depends on the diameter of screw and the type of material (Max RPM of screw conveyor is 165)

Loading efficiency:

The value of loading efficiency should be taken large for materials which are free flowing and non abrasive, while for materials which are not free flowing and or abrasive in nature, the value should be taken low:

Ψ = 0.12 to 0.15 for abrasive material

= 0.25 to 0.3 for mildly abrasive material

= 0.4 to 0.45 for non abrasive free flowing materials

Inclination Factor:

The inclination factor C is determined by the angle of screw conveyor with the horizontal.

Angle of screw with the horizontal	0°	5°	10°	15°	20°
Value of factor C	1	0.9	0.8	0.7	0.65

Internal Resources:

Screw Conveyor Power Calculation | Screw Conveyor Capacity Calculation | Does Your Screw Conveyor Design Pass The Test? 7 Things You Can Improve On Today

noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 08:41:00 +0000

Screw Conveyor Power Calculation / Screw Conveyor Capacity calculation

The weight or volume per hour is known as the capacity of a bulk material which can be transported safely and easily using a screw conveyor through that screw conveyor power calculation is made.

What is Screw Conveyor?

Screw conveyors are one of the most common transportation and delivery systems for bulk solids. Screw conveyors are commonly used to transport bulk materials, depending on the material characteristics of the particular bulk material, at 15, 30 or 45 % trough loading. In general, 45 % trough loading may be used for bulk materials that are lightweight, free flow or non-abrasive. For denser, lenient and abrasive bulk materials, trough loadings of 15 and 30% are usually used.

Screw conveyors are one of the most reliable and cost-effective methods for conveying bulk materials. Due to their versatility, screw conveyors can convey a wide variety of bulk materials ranging from dry, free-flowing portland cement to wet, sluggish dewatered biosolids.

Screw conveyors can be designed to operate in almost any position, from horizontal to vertical. Inclined screw conveyors are used to convey and elevate bulk materials from one level to another. Depending upon the bulk material and the objective, proper design and construction of an inclined screw conveyor will provide many years of uninterrupted service and productivity. The purpose of this article is to help the reader understand the basics of inclined screw conveyor design for various applications.

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History of Screw Conveyors

Archimedes designed the screw conveyor in the third century B.C. The first screw was used for removing water from ships and for irrigating farmland. The original device consisted of spiral flights fixed to the inner wall of a hollow cylinder driven by a center shaft. As the assembly rotated, water was conveyed and lifted from one location to another. The spiral design is based on the theory of the inclined plane. The screw conveyor has evolved in modern times and is now used in almost every major industry.

Power requirement of Screw Conveyors or Screw Conveyor Power Calculation

Screw Conveyor design calculation – Screw conveyor power calculation – Screw Conveyor efficiency

It must be noted that those formula aim at giving an idea of the size of the screw conveyor (which means its diameter) and the speed at which it will operate, based on some assumptions and some design decisions (choice of screw pitch, inclination). The formula can also be used to roughly check the capacity of an existing screw conveyor power calculation.

The driving power of the loaded screw conveyor is given by:

P = P_H + P_N + P_st

Where,

P_H = Power necessary for the progress of the material

P_N = Driving power of the screw conveyor at no load

P_st= Power requirement for the inclination of the conveyor

Power necessary for the progress of the material P_H: / Screw Conveyor power calculation

For a length L of the screw conveyor (feeder), the power PH in kilo watts is the product of the mass flow rate of the material by the length L and an artificial friction coefficient λ, also called the progress resistance coefficient.

P_H = I_m.L. λ.g / 3600 (kilowatt)

= I_m.L. λ / 367 (kilowatt)

Where,

I_m = Mass flow rate in t/hr

λ = Progress resistance coefficient

Each material has its own coefficient λ. It is generally of the order of 2 to 4. For materials like rock salt etc, the mean value of λ is 2.5. For gypsum, lumpy or dry fine clay, foundry sand, cement, ash, lime, large grain ordinary sand, the mean value of λ is 4.0.

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In this connection it should be noted that the sliding of the material particles against each other gives rise to internal friction. Other resistance due to grading or shape of the output discharge pattern contributes to the resistance factor. That is why the parameter λ is always higher than that due to pure friction.

Drive power of the screw conveyor at no load, P_N: / Screw Conveyor Power calculation

This power requirement is very low and is proportional to the nominal diameter and length of the screw.

P_N = D.L / 20 (Kilowatt)

Where,

D = Nominal diameter of screw in meter

L = Length of screw conveyor in meter

Power due to inclination: P_st

This power requirement will be the product of the mass flow rate by the height H and the acceleration due to gravity g.

P_st = I_m.H.g / 3600

= I_m.H / 367

H should be taken positive for ascending screws and will be negative for descending screws.

Total power calculation requirement of screw conveyor

The total power requirement of screw conveyor power calculation is the sum total of the above items

P = (I_m (λ.L + H) / 367) + (D.L /20) (Kilowatt)

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noreply@blogger.com (Geetha) — Sat, 02 Oct 2021 08:37:00 +0000

Vertical screw conveyors:

Vertical screw conveyors

A vertical screw conveyors conveys material upward in a vertical path. It requires less space than some other types of elevating conveyors. Vertical screw conveyors are also referred as 'Lifts' or 'Elevators'. Vertical screw conveyor can handle most of the bulk materials provided there is no large lump. The maximum height is usually limited to 30m.

The vertical screw conveyors system is a great solution to many material handling problems by providing a cost effective elevating action with minimum space requirements. The vertical is fed by a horizontal feed screw which is synchronized with by speed and feed rate. Both the feed screw and the vertical are driven by independent screw conveyor drives.

A vertical screw conveyors consists of a screw rotating in a vertical casing. The top bearing for the screw shaft must be designed to stand against radial and thrust loads. A suitable inlet port at the lower end and a discharge port at the upper end of the casing are provided. Feeding a vertical screw conveyors deserves careful consideration. Most materials are fed to the vertical conveyor by a straight or offset horizontal feeder conveyor. The ideal operation of a vertical screw conveyor is to have a controlled and uniform volume of material feeding.

Uneven feeding and start stop operation may adversely affect the performance of the vertical screw conveyors in terms of speed, capacity and horse power.

Schematic layout of vertical screw conveyor

Discharge Arrangement in Vertical Screw Conveyors

Discharge of material in a vertical screw is achieved through an opening similar to that of a horizontal conveyor. The discharge spout may be connected to an elbow or other type of discharge to move material into a subsequent conveyor or process.

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To ensure positive discharge of material, vertical screws are often affixed with "kicker paddles", other flat paddle‐type or reverse flights to foster complete discharge of the material. Even so, there are times when it is advisable to provide a safety overflow. This is usually an opening diametrically opposite and above the discharge spout, arranged to spill the material if the discharge spout becomes clogged and unable to handle the normal material flow.

Hanger or Stabilizer Bearings in Vertical Screw Conveyors

Intermediate hanger or stabilizer bearings usually are necessary in vertical screw conveyors when extended heights of lift are required, to eliminate excessive screw deflection and "whip." These hanger or stabilizer bearings are positioned between the sections of the screw and are supported between the housing flanges. The particular kind of hanger or stabilizer bearing to use is determined by the characteristics of the material being handled.

Some materials travel upward in a mass and would experience obstruction by an intermediate stabilizer or hanger bearing. One such material is cottonseed. With it, hanger bearings are not used. Certain other materials tend to center the screw within the housing, thus eliminating the need for stabilizer bearings. Some lighter duty materials can also allow for wear‐shoe made out of a material such as UHMW; this is simply a flight that extends slightly past the O.D. of the screw to assist in centering and eliminating "whip."

Vertical Screw Conveyors Construction Materials

Carbon Steel
Abrasion resistant steel
Stainless steel

Average capacities and speeds of Vertical Screw Conveyors

Nominal diameter of screw in mm	Capacities in m³/hr	Speed of screw
150	10	Up to 400 RPM
250	35	300 RPM
300	75	250 RPM
400	170	200 RPM

What are the things you need to consider to put up a Vertical conveyor system?

1.) Lump Size – Material with large variance in particle size, or excessively large lumps tend not to properly convey in a vertical screw. In general, free‐flowing material that does not degrade will work suitably in a vertical screw. Friable material along with extremely fine powders that aerate will often have issue working properly in a vertical screw.
2.) Extremely Dense Material – Very dense material that has little to no compressive capability may not convey properly due to the fully loaded condition and speed at which a vertical screw operates.
3.) Abrasive Materials – Due to the high speeds and full contact of the material to the screw, abrasive materials may rapidly degrade components, along with prematurely wearing seals and drive components.

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Vertical screw conveyors or some special design of vertical screw conveyor finds wide application in ship unloading.

Vertical screw conveyor-vertical screw pump

Practical experience with these conveyors has shown that the resistance factor for vertical conveyors is higher than those of the horizontal conveyors. Resistance factor λ may be taken as 5.5 to 7.5 for grains. 6.5 to 8.3 for salt.

Design of Vertical Screw Conveyors

The driving power of the loaded screw conveyor is given by:

P = P_H + P_N + P_st

Where,

P_H = Power necessary for the progress of the material

P_N = Driving power of the screw conveyor at no load

P_st= Power requirement for the inclination of the conveyor

Power necessary for the progress of the material P_H:

P_H = I_m.L. λ.g / 3600 (kilowatt)

= I_m.L. λ / 367 (kilowatt)

Where,

I_m = Mass flow rate in t/hr

λ = Progress resistance coefficient

Drive power of the Vertical screw conveyor at no load, P_N:

This power requirement is very low and is proportional to the nominal diameter and length of the screw.

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P_N = D.L / 20 (Kilowatt)

Where,

D = Nominal diameter of screw in meter

L = Length of screw conveyor in meter

Power due to inclination: P_st

This power requirement will be the product of the mass flow rate by the height H and the acceleration due to gravity g.

P_st = I_m.H.g / 3600

= I_m.H / 367

H should be taken positive for ascending screws and will be negative for descending screws.

Total power requirement of Vertical Screw Conveyor:

The total power requirement is the sum total of the above items

P = (I_m (λ.L + H) / 367) + (D.L /20) (Kilowatt)

Advantages of Vertical Screw Conveyor

Efficient design
Easy of installation
Requires less space
More cost effective
Can be dust tight
Material discharge in any direction

Disadvantages of Vertical Screw Conveyor

If the rotation of the vertical screw is stopped, the conveyor will be full of materials. It is also true that if the vertical screw is left turning but the feed of material ceases, the vertical screw conveyor will not empty itself, some of the material will be left in the housing in an amount depending on the material characteristics. It is important to realize, however, that material left over from previous operations will be the first to discharge when the vertical screw conveyor is restarted.
The ideal operation of a vertical screw conveyor is to have a controlled and uniform volume of material fed to the unit. Uneven or surge loads and start, stop operations can affect specifications of speed, capacity and horsepower. Some granular or pelletized materials can roll to the bottom of the vertical section after stopping and will then create a starting problem.

Applications of Vertical Screw Conveyor

Animal feed
Pet food
Food processing
Ice
Bulk powders
Bio solids
Pellets
Bone and Blood meal