MEC-302 Term Paper

8/2/2019 MEC-302 Term Paper

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TERM PAPERDynamics of Machines (MEC-302)

Belt Conveyor System

SUMITTED BY : Vardhan Mahendru

Roll No : B15

Section : M3R06

SUMITTED TO : Ms. Sumit Shoor

DOS : 04/04/2012


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Index

1. Acknowledgements 32. Conveyor System 43. Whats a Conveyor Belt? 44. Conveyor Belt Construction 55. Belt Conveyor Systems 12

6.

Working of a Belt Conveyor System

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7. Applications 148. References 15


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Acknowledgements

I avail this opportunity to convey my sincere thanks to Mr. Sumit Shoor our MEC-302

teacher who helped me to use my skill in the right way by giving me and by rendering all

the possible help from all the sides.

Without his kind co-operation and noble assistance this project would not have been

concluded. Therefore, from the nucleus of my heart, I express gratitude to my worthy

teacher for devoting his worthless time and helping me in this project.

I also feel acknowledged to my parents and my friends who encouraged me to work and

complete the project .There have been others also who have motivated; corrected or

customized my thoughts and I would be grateful to them from the interior of my heart.

Thanking You

Vardhan Mahendru


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Conveyor system

A conveyor system is a common piece of

mechanical handling equipment that

moves materials from one location to

another. Conveyors are especially useful

in applications involving the

transportation of heavy or bulky

materials. Conveyor systems allow quick

and efficient transportation for a wide

variety of materials, which make them

very popular in the material handling and

packaging industries. Many kinds of

conveying systems are available, and areused according to the various needs of

different industries. There are chain

conveyors (floor and overhead)as well.

Chain conveyors consist of enclosed

tracks, I-Beam, towline, power & free,

and hand pushed trolleys.

Types of conveyor systems

Gravity roller conveyor Gravity skate wheel conveyor Belt conveyor Wire mesh conveyors Plastic belt conveyors Bucket conveyors Flexible conveyors Vertical conveyors Spiral conveyors Vibrating conveyors Pneumatic conveyors Belt driven live roller conveyors Line shaft roller conveyor Chain conveyor Screw conveyor Chain driven live roller conveyor Overhead conveyors Dust proof conveyors Pharmaceutical conveyors Automotive conveyors

Well be focusing our study on Belt

Conveyors only.

Whats a Conveyor Belt?

A conveyor belt (or belt conveyor)

consists of two or more pulleys, with a

continuous loop of material - the

conveyor belt - that rotates about them.

One or both of the pulleys are powered,

moving the belt and the material on the

belt forward. The powered pulley is

called the drive pulley while theunpowered pulley is called the idler.

There are two main industrial classes of

belt conveyors; those in general material

handling such as those moving boxes

along inside a factory and bulk material

handling such as those used to transport

industrial and agricultural materials, such

as grain, coal, ores, etc. generally in

outdoor locations. Generally companies

providing general material handling type

belt conveyors do not provide the

conveyors for bulk material handling. In

addition there are a number of

commercial applications of belt

conveyors such as those in grocery stores.

The belt consists of one or more layers of

material. They can be made out of rubber.

Many belts in general material handling

have two layers. An under layer of

material to provide linear strength and

shape called a carcass and an over layer

called the cover. The carcass is often a

cotton or plastic web or mesh. The cover

is often various rubber or plastic

compounds specified by use of the belt.

Covers can be made from more exotic

materials for unusual applications such as


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silicone for heat or gum rubber when

traction is essential.

Material flowing over the belt may be

weighed in transit using a beltweigher.Belts with regularly spaced partitions,

known as elevator belts, are used for

transporting loose materials up steep

inclines. Belt Conveyors are used in self-

unloading bulk freighters and in live

bottom trucks. Conveyor technology is

also used in conveyor transport such as

moving sidewalks or escalators, as well

as on many manufacturing assemblylines. Stores often have conveyor belts at

the check-out counter to move shopping

items. Ski areas also use conveyor belts

to transport skiers up the hill.

A wide variety of related conveying

machines are available, different as

regards principle of operation, means and

direction of conveyance, including screw

conveyors, vibrating conveyors,pneumatic conveyors, the moving floor

system, which uses reciprocating slats to

move cargo, and roller conveyor system,

which uses a series of powered rollers to

convey boxes or pallets.

Conveyor Belt Construction

Conveyor belts generally are composed

of three main components:

1. Carcass2. Skims3. Covers (carry cover and pulley

cover)

Carcass

The reinforcement usually found on the

inside of a conveyor belt is normally

referred to as the carcass. In a sense,

the carcass is the conveyor belt since it

must:

Provide the tensile strengthnecessary to move the loaded belt.

Absorb the impact of the impingingmaterial being loaded onto the

conveyor belt.

Provide the bulk and lateral stiffnessrequired for the load support.

Provide adequate strength for properbolt holding and/or fastener holding.

The carcass is normally rated by the

manufacturer in terms of maximum

recommended operating tension

permissible ( pounds per inch i.e., ppi).

Similarly, the manufacturer rates the

finished belt in terms of maximum

recommended operating tension per inch

of width (which is the total of the

preceding, multiplied by the number of

plies in the belt construction) i.e., 4 plies

of 110# fabric = a 440 pound per inch of

width (PIW) working tension belt.

The manufacturer determines the

maximum recommended operatingtension per inch of width with

considerations given to:

Stretch characteristics of the belt. Fastener/bolt holding capability. Load characteristics. Stiffness. Impact resistance of the belt

construction.


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There is a relationship between the

recommended maximum operating

tension per inch of width of the belt and

the ultimate tensile strength (breaking

strength) of the belt which will be

explained later.

Carcass Design

Multi-Plies + Elastomer = Plylok

Supreme Plylok, PHR and PRL

The most common carcass design is

made up of layers or plies of woven

fabrics bonded together (see Illustrationbelow). This conventional plied belt

construction, generally employs a plain

weave or twill weave carcass which is

built up into as many layers as is required

to provide the necessary belt

strengthusually bound together with

rubber.

In the plain weave, the warp yarns

(lengthwise yarns) and the fill yarns

(crosswise yarns) pass over and under

each other. This means that both

members are crimped (Essentially,

each assumes a sine-wave-like

configuration). This fact, plus the basic

characteristics of the fiber used give the

belt its stretch characteristics.

Conventional plied carcass belts havebeen used for decades. Consequently,

they are the most common belt design

used today. Most conveyor engineers and

millwrights are familiar with

conventional plied belting constructions

and their characteristics. Virtually, all

belting mechanics know how to splice

conventional plied belts. This familiarity

with the belts characteristics and the

ease of endlessing gives the

conventional plied belting design its

broad customer acceptance.

When cotton and similar materials were

widely used as carcass components inplied belts, a breaker strip, an additional

layer of open weave fabric was added

between the carcass and the top cover for

heavy abuse constructions, helping

absorb the loading impact. The switch to

modern synthetic carcass materials (like

polyester and nylon) has essentially

eliminated the need for the breaker strip.

Today, breaker strips are seldom found inplied belt constructions except in extreme

impact applications.

Conventional plied belting constructions,

employing all synthetic carcasses and

elastomer covers appropriate to the end

use, are particularly recommended for:

1) Hard Rock Mininga) Aggregate, sand and ore

2) General purpose applications3) Forest products4) Soft Minerals

a) Coalb) Potash, Phosphatesc) Grain

5) Unit Handlinga) Parcelsb) Baggagec) Mail

Skims

The rubber, PVC or urethane between

plies is called a skim. Skims are

important contributors to internal belt

adhesions, impact resistance, and play a

significant role in determining belt load

support and troughability.


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Improper or marginal skims can

adversely affect belt performance in

general and can lead to ply separation

and/or idler junction failure.

Straight Warp Wearlock,

Kordlok, PVK, PHR.

The straight warp carcass design yields a

carcass construction wherein the basic

lengthwise (warp) yarns are essentially

uncrimped. These are the main load-

carrying tension yarns. Fill yarns are then

laid transversely and alternately, aboveand below the main tension yarns. This

construction gives greater dimensional

stability to the belt, and does employ a

beam" effect for better load support and

transverse rigidity.

The yarns used are much thicker than

yarns in conventional fabrics. Further,

they are locked together by means of

another series of lengthwise yarns,known as the binder warp system. The

binder warp system locks the tension and

fill cords tightly together, creating a belt

which is unusually tough and which has

exceptional tear and impact resistance, as

well as good fastener and bolt holding

ability.

The straight warp configuration for the

basic tension yarns essentially eliminates

geometric stretch and results in a

conveyor belt construction with a

minimum stretch characteristic. . .a

significant advantage in most conveyor

belt applications.

Straight Warp constructions are used

for:

1) Hard Rock Mininga) Aggregate, sand and oreb) High impact applications

2) General purpose applications3) Soft Minerals

a) Coalb) Potash, Phosphatec) Grain

4) Unit Handlinga) Parcelsb)

Baggage

c) MailThe solid woven design can be

considered an extension of the straight

warp concept. Polyester filament yarns,

as well as spun polyester staple yarns, are

coupled in a highly complex fabric

construction, which is somewhat similar

to the straight warp. However, because of

the high performance requirements ofthese constructions, more than one layer

of basic, warp yarns are used. The whole

is interlocked and tied into one single

mass by means of a uniquely designed

binder warp system. Spun polyester

staple yarns protect the two faces of the

carcass construction and combined with

the high performance PVC, form the

working surface of the belt itself.

PolyVinylok, a single-ply conveyor and

elevator belting construction, has found

wide acceptance in:

A broad range of industrial applications

Agricultural equipment Food processing; Grain handling (conveyor and

elevator);


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Underground mining, such as coal,potash, and other soft minerals;

Forest products.

Steel Cord + Rubber

Steel Cord-type constructions utilize a

single layer of uniformly tensioned steel

cords as strength members; encased in

rubber. Steel cord belts are generally

found in high tension applications

ranging from 600 PIW to 5,000 PIW

and/or where extremely low stretch is anecessity. Typical elongation for steel

cord conveyor belting is less

than 1/3 of 1%. Steel cord belts must be

manufactured to width.

Strength Designations

In the past, when cotton was the primary

fabric for carcass construction, all fabrics

were designated by the weight of a piece

of fabric 42" X 36", i.e., in cotton 28 oz.,

32 oz. Duck, etc. As new carcass

materials were developed that varied in

strengths and weights, new methods of

designation were required. As a general

rule, current fabrics in use are designated

by the working tension or strength of the

fabric, shown in pounds per inch of width

(PIW), i.e.25, 45, 80, 110, 125,150, 200,

250 and 300 pound fabrics, etc.

When dealing with carcass fabrics, we

work with two separate strength

measurements. The first is the Maximum

Working Tension or strength of

the belt. This is the highest tension

occurring in any portion of the belt on the

conveyor system, under normal operating

conditions. This is the strength

measurement used to determine the

proper belt for the system. The second

measurement is the Ultimate Tensile

Strength of the belt. The ultimate tensile

strength of a belt is the point at which

that belt will rupture and fail due to

excessive tension.

The difference between the maximum

working tension and the ultimate tensile

strength of the belt is often referred to as

the service factor. On top quality

domestic conveyor belting, this servicefactor is 8-10 to 1. Most Georgia Duck

belting has a 10 to 1 service factor. This

means that if the maximum working

tension is 200 PIW, the ultimate tensile

strength would be 2,000 PIW. Belting

utilizing nylon constructions generally

has a service factor of more than 10 to 1.

This higher service factor is necessary to

overcome some of the inherent properties

of nylon, such as excessive elongation.

Most conveyor belt fabrics are produced

today with polyester warps (lengthwise

yarns) and nylon fills (widthwise yarns).

This combines the best properties of both

textiles offering high strength, low stretch

conveyor belt with excellent impact

resistance, troughability, load support,

and fastener and/or bolt-holding ability.

Materials - Fibers

Carcass materials used in belt

manufacture in recent years are listed as

follows. Given is the common name, the

composition and some general comments

about each material. (Please note their

characteristics and current position in the

market place)


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Cotton Natural Cellulose Composition

Only natural fiber used to any great extent in belting manufacture.Increases in strength when wet. High moisture absorption - consequently,

poor dimensional

stability. Susceptible to mildew attack. At one time represented 80% of theraw fiber input into belt manufacture. Currently, something less than 5%.

Rayon Regenerated Cellulose CompositionSlightly stronger than cotton, but tensile strength is lowered by water.

Chemical resistance similar to cotton. High moisture absorption -

consequently, poor dimensional stability. Susceptible to mildew attack.

Almost nonexistent in conveyor belt today.

Glass Glass

Very high strength compared to rayon. Low elongation. Mainly used inhigh temperature applications. Poor flex life. Limited use in belt

manufacture currently.Nylon Polyamide

High strength, high elongation, good resistance to abrasion, fatigue andimpact. While moisture absorption not as high as cotton, it will absorb up

to 10% of its own weight in moisture. Consequently, poor dimensionalstability. High resistance to mildew. At one time, nylon represented 40% of

the raw material input into belt manufacturing. Today, it is something less

than 20%.

Polyester PolyesterHigh strength, exceptionally good abrasion and fatigue resistance.

Extremely low moisture absorption. . .consequently good dimensional

stability. Unaffected by mildew. Georgia Duck selected polyester as its

fabric of choice in 1960. Polyester usage in the manufacture of belting

has grown from 0% in 1960 to something in the range of 70-75% today.

(See Georgia Duck technical data bulletin Polyester, The Fiber ofChoice).

Steel SteelUsed where high strength and extremely low stretch are a necessity. A

small amount of woven steel carcass is found in todays market. However,

more steel is used in steel cord-like belt constructions. Kevlar Aramid

Aramid (the material used in flak jackets and bullet-proof vests) has twice

the strength of steel, with stretch characteristics roughly halfway betweensteel and polyester. It is significantly lower in weight than steel and willnot rust.

Kevlar Aramid

Aramid (the material used in flak jackets and bullet-proof vests) has twice

the strength of steel, with stretch characteristics roughly halfway between

steel and polyester. It is significantly lower in weight than steel and will

not rust.


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Covers

Covers are used in conveyor belt

constructions in order to protect the base

conveyor belt carcass and, if possible, to

extend its service life. In addition, covers

do provide the finished belt with a wide

variety of desirable properties, including

the following:

Textureso To increase frictiono To increase inclinationo To control product

Cleanability A specific coefficient of friction A specific color Cut resistance Enhanced impact resistance, etc. Hardness Fire Resistance, Oil & Chemical

Resistance

Cover type, quality and thickness are

matched to the service life of the belt

involved. A specific cover formulation

used in an individual belt construction is

determined by the material to be carried

and the environment in which the belt

will operate.

Historic belt constructions were highlysusceptible to moisture and chemical

attack because of their cotton carcass

components. Accordingly, it was

common to extend the belt covers over

the edges of the belt in what is known as

the molded edge construction. This

type of manufacturing can be expensive

because of the additional labor and

machine time involved.

Modern day belt constructions, with their

high adhesion levels and synthetic

carcasses, are considerably less

susceptible to moisture and chemical

attack, and do not require edge

protection. They make possible the slit-

edge belt distribution programs

currently used in the Belting Industry.

Costs are minimized since an 84" slit-

edge belt can be manufactured about as

quickly (if not more so) as a 24" molded

edge construction. Further, the labor

involved is somewhat less.

Georgia Duck uses an extremely wide

variety of polymers for our cover needs,

including: Polyvinylchloride, natural

rubber, various synthetic rubbers and

urethane - -to meet individual customer

needs. Quality competitors offer covers

made of similar polymers although their

individual recipe may be somewhat

different. Individual cover formulations

are usually blends consisting of one

principal polymer and assorted modifiers,

such as other polymers, antioxidants,

accelerators, curatives, pigments,

extending and reinforcing fillers,

plasticizers, etc.

Specific conveyor belt applications

seldom require the belt cover to satisfy

one or two conditions. More usually, a

broad variety of required and desired

properties are encountered. The specific

cover formulation is quite likely to be a

compromise, which seeks to meet the

customers criteria and still remain cost

effective. For many applications, the

blending of polymers adds properties that

could not be obtained in a single polymer

compound.


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The Georgia Duck Chemical Resistance

Chart lists characteristics of many belt

covers offered by Georgia Duck. Specific

compound properties are detailed as is

chemical resistance. This list is an

important assist in selecting proper cover

compounds.

In addition to selecting proper

compounds for cover material, it is also

necessary to determine the proper cover

thickness. The thickness of a cover is

influenced by the amount of abuse and

wear the belt will receive. The cover isusually the lowest cost component of the

belt.

The severity of the wear depends on the

nature of the material and on the size,

weight, shape and trip rate of the material

conveyed. Sharp edges, particularly on

large pieces, can quickly cut a cover

badly. On the other hand, if loading

conditions are ideal, with the materialbeing loaded in the direction of travel of

the belt, and with only a slight impact

onto the belt, even very sharp material

may not seriously cut or wear the belt

surface. Cover wear is also influenced by

the loading area being on the horizontal

compared to loading a conveyor belt on

an incline which will result in the product

bouncing around more before the load

settles down. This increased product

movement will adversely affect cover

wear.

Wearability of rubberlike compounds can

be characterized by PICO abrasion test.

This test assigns wearability level or

abrasion numbers to various

elastomers. The higher the number, the

more durable the elastomer. For example,

Grade I rubber normally will test out at a

PICO rating of 135, while a Grade II

rubber will yield a PICO of 100, and

PVC a PICO of 50. The Taber abrasion

test more directly relates to sliding wear (

slider beds, side loading, etc.) and is

therefore used more frequently in

measuring belts used in unit handlingsystems.

Fillers and additives added to a given

recipe can affect the PICO adversely. It is

not uncommon, for example, for an oil

resistant, MSHA, rubber elastomer to

yield a PICO in the 50s or60s.


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Belt conveyor systems

Conveyor belts are basically very widebelts attached in a loop to two or more

turning rotors driven by motors. The loop

is the actual conveyor belt, and is

generally made of two or more layers of

rubber, one layer to give shape and

structure to the belt and one to allow it to

transport its load safely. This conveyor

loop is generally attached to two wheels,

called rotors, which are spun by motors.The conveyor belt has enough friction

between it and the rotor that it sticks to

this rotor. Conveyors are durable and

reliable components used in automated

distribution and warehousing. In

combination with computer controlled

pallet handling equipment this allows for

more efficient retail, wholesale, and

manufacturing distribution. It is

considered a labor saving system that

allows large volumes to move rapidly

through a process, allowing companies to

ship or receive higher volumes with

smaller storage space and with less labor

expense.

Rubber conveyor belts are commonly

used to convey items with irregular

bottom surfaces, small items that would

fall in between rollers (e.g. a sushi

conveyor bar), or bags of product that

would sag between rollers. Belt

conveyors are generally fairly similar in

construction consisting of a metal frame

with rollers at either end of a flat metal

bed. The belt is looped around each of the

rollers and when one of the rollers is

powered (by an electrical motor) the

belting slides across the solid metal frame

bed, moving the product. In heavy use

applications the beds which the belting is

pulled over are replaced with rollers. The

rollers allow weight to be conveyed as

they reduce the amount of friction

generated from the heavier loading on the

belting. Belt conveyors can now be

manufactured with curved sections which

use tapered rollers and curved belting to

convey products around a corner. These

conveyor systems are commonly used in

postal sorting offices and airport baggage

handling systems. A sandwich belt

conveyor uses two conveyor belts, face-to-face, to firmly contain the item being

carried, making steep incline and even

vertical-lift runs achievable.

Belt conveyors are the most commonly

used powered conveyors because they are

the most versatile and the least expensive.

Product is conveyed directly on the belt

so both regular and irregular shaped

objects, large or small, light and heavy,

can be transported successfully. These

conveyors should use only the highest

quality premium belting products, which

reduces belt stretch and results in less

maintenance for tension adjustments. Belt

conveyors can be used to transport

product in a straight line or through

changes in elevation or direction. In

certain applications they can also be usedfor static accumulation or cartons.

On the Time Scale

Primitive conveyor belts were used since

the 19th century. In 1892, Thomas

Robins began a series of inventions

which led to the development of a


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conveyor belt used for carrying coal, ores

and other products. In 1901, Sandvik

invented and started the production of

steel conveyor belts. In 1905 Richard

Sutcliffe invented the first conveyor belts

for use in coal mines which

revolutionized the mining industry. In

1913, Henry Ford introduced conveyor-

belt assembly lines at Ford Motor

Company's Highland Park, Michigan

factory. In 1972, the French society REI

created in New Caledonia the then

longest straight-belt conveyor in the

world, at a length of 13.8 km. HyacyntheMarcel Bocchetti was the concept

designer.[citation needed] In 1957, the B.

F. Goodrich Company patented a

conveyor belt that it went on to produce

as the Turnover Conveyor Belt System.

Incorporating a half-twist, it had the

advantage over conventional belts of a

longer life because it could expose all of

its surface area to wear and tear. Mbiusstrip belts are no longer manufactured

because untwisted modern belts can be

made more durable by constructing them

from several layers of different materials.

In 1963-64, First Indian Small Scale

Industrial Unit with Japanese Plant for

Rubber Belts for Conveyor / Elevator /

Transmission was installed near National

Capital Territory of Delhi and its Mr.

Belts Conveyor Belting has been widely

used in Steel, Cement, Fertilizer, Thermal

Power, Sponge Iron Plants and Coal /

Mineral establishments / Mines, Port

Trusts and similar material handling

applications of Industry for the last over 4

decades.

Working of a Belt Conveyor

System

The Movement of a Conveyor Belt

As a rotor turns, the conveyor belt will

turn as well due to the intense friction

between the rotor wheel and the belt.

This turning motion of the rotor causes

one side of the belt to move in one

direction, while the other moves in the

opposite direction. This means that bothwheels must always be moving in

relatively the same direction, either

clockwise or counter-clockwise. If the

two rotor wheels moved in opposite

directions, the conveyor belt would not

travel at all.

The Transportation Along a Conveyor

The word convey means to send or

transmit; therefore, a conveyor is

something that sends or transmits.

Conveyor belts, mostly used in industry,

convey products or raw materials through

the use of either friction or mounts on the

belt meant to hold the product in place as

the belt moves. As the conveyor belt

moves its product, the product staysaround one place on the conveyor. Many

times, twists or turns are put in

conveyors; these are facilitated by cone

shaped rotors or wheels, which allow the

conveyor to turn.


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Applications

Manufactured with the best quality steel

such as EN 9, EN 8 and EN 24, our

Portable Belt Conveyor has found a

number of applications in cement,

agriculture and paper industries. Ideal to

be used for medium and heavy weight,

our Belt Conveyor System is found in a

number of dimensions to meet the

specific requisites of the clients. Today,

we are counted among the leading Flat

Belt Conveyor Manufacturers and

Suppliers.

Flat Belt Conveyor:

This is normally used for light and

medium weight loads between

operations, departments, levels, and

buildings. It is imperative in places where

incline or decline is included in the

conveyor path. The belt is generally of

roller or slider bed supported for smalland irregularly shaped material.

Portable Belt Conveyor:

The portable belt conveyors are suitable

for light to medium loads and offer

flexible conveying path such as

inclination, curve, long term

dependability and low operational cost.

Our range is used for transport industrialand agricultural materials, such as grain,

coal, ores and many more.

Features:

Consists of rollers mounted on selfaligning frames.

Bearing are incorporated in therollers to minimize the mechanical

losses.

Gantry are provided for stiffeningavailable up to 2000mm width

&infinite length

Walkway is provided on one/ bothsides of conveyor in order to

maintain the conveyor Drive as given

through rubberized rollers andtension is adjusted through gravity

and screw.

Belt Conveyor Systems are

Commercially used in:

Agriculture Construction - heavy building

materials.

Food and beverage processing. Forestry - logging, sawmill, paper

pulp, etc.

Mining and quarrying. Factory production line. Airports.


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References: -

Bulk Material Handling by ConveyorBelt by M. A. Alspaugh

Automation, Production Systems,and Computer-Integrated

Manufacturing by Mikell P. Grover

Theory of Machines by S.S. Ratan R. S. Khurmi Theory of Machines

Websites: -

http://www.ehow.com/how-does_4922797_conveyor-belt-

work.html

http://en.wikipedia.org/wiki/Conveyor_systems

http://garlockrubber.com/primary/products/heavy-duty-conveyor-

belts/hdcb-resources/conveyor-belt-

components/

http://en.wikipedia.org/wiki/Belt_conveyor
http://www.ehow.com/how-does_4922797_conveyor-belt-work.htmlhttp://www.ehow.com/how-does_4922797_conveyor-belt-work.htmlhttp://www.ehow.com/how-does_4922797_conveyor-belt-work.htmlhttp://www.ehow.com/how-does_4922797_conveyor-belt-work.htmlhttp://en.wikipedia.org/wiki/Conveyor_systemshttp://en.wikipedia.org/wiki/Conveyor_systemshttp://en.wikipedia.org/wiki/Conveyor_systemshttp://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://en.wikipedia.org/wiki/Belt_conveyorhttp://en.wikipedia.org/wiki/Belt_conveyorhttp://en.wikipedia.org/wiki/Belt_conveyorhttp://en.wikipedia.org/wiki/Belt_conveyorhttp://en.wikipedia.org/wiki/Belt_conveyorhttp://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://garlockrubber.com/primary/products/heavy-duty-conveyor-belts/hdcb-resources/conveyor-belt-components/http://en.wikipedia.org/wiki/Conveyor_systemshttp://en.wikipedia.org/wiki/Conveyor_systemshttp://www.ehow.com/how-does_4922797_conveyor-belt-work.htmlhttp://www.ehow.com/how-does_4922797_conveyor-belt-work.htmlhttp://www.ehow.com/how-does_4922797_conveyor-belt-work.html

MEC-302 Term Paper

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