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 the unpowered 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 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 assembly lines. 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.
Belt conveyor systems
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 used for static accumulation or cartons.
Long belt conveyors
The longest conveyor system in an Airport is the Dubai International Airport baggage handling system at 92 km. It was installed by Siemens and commissioned in 2008, and has a combination of traditional belt conveyors and tray conveyors.
The longest single belt conveyor runs from Meghalaya in India to Sylhet in Bangladesh. It is about 17 km long and conveys limestone and shale at 960 tons/hr, from the quarry in India to a cement factory in Bangladesh (7 km long in India and 10 km long in Bangladesh). The conveyor was engineered by AUMUND France and Larsen & Toubro. The conveyor is actuated by 3 synchronized drive units for a total power of about 1.8 MW (2 drives at the head end in Bangladesh and 1 drive at the tail end in India). The conveyor belt was manufactured in 300-meter lengths on the Indian side and 500-meter lengths on the Bangladesh side, and was installed onsite by NILOS India. The idlers, or rollers, of the system are unique in that they are designed to accommodate both horizontal and vertical curves along the terrain. Dedicated vehicles were designed for the maintenance of the conveyor, which is always at a minimum height of 5 meters above the ground to avoid being flooded during monsoon periods.
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 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. Hyacynthe Marcel Bocchetti was the concept designer. 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. Möbius strip 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 MrBelts 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;
- Chain conveyor
- Conveyor systems
- Lineshaft roller conveyor
- Moving walkway
- Thermohaline circulation
- ^ "Conveyor". Webb Conveyor. http://www.jervisbwebb.com/Categories/Conveyors.aspx?cid=2. Retrieved 27 October 2011.
- ^ Alspaugh, Mark, Bulk Material Handling By Conveyor Belt 7, p83 id = ISBN 0-87335-260-2
- ^ http://pid.adb.org/pid/PsView.htm?projNo=31911&seqNo=01&typeCd=4 Asian Development Bank description of the Lafarge Surma project
- ^ http://www.minesandcommunities.org/article.php?a=5590
- ^ "Robins, Thomas". Encyclopedia Americana. 1920.
- ^ Hounshell, David A. (1984), From the American System to Mass Production, 1800-1932: The Development of Manufacturing Technology in the United States, Baltimore, Maryland, USA: Johns Hopkins University Press, ISBN 978-0-8018-2975-8, LCCN 83-016269 .
- ^ http://www.daviddarling.info/encyclopedia/M/Mobius_band.html
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Look at other dictionaries:
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conveyor belt — ► NOUN ▪ a continuous moving band used for transporting objects from one place to another … English terms dictionary
conveyor belt — [[t]kənve͟ɪə(r) belt[/t]] conveyor belts 1) N COUNT A conveyor belt or a conveyor is a continuously moving strip of rubber or metal which is used in factories for moving objects along so that they can be dealt with as quickly as possible. The… … English dictionary
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conveyor-belt — ̷ ̷ˈ ̷ ̷ ̷ ̷| ̷ ̷ adjective Etymology: conveyor belt : of, relating to, or characteristic of mass production conveyor belt uniformity conveyor belt shoddiness Roy Lewis & Angus Maude … Useful english dictionary
conveyor belt — con veyor ,belt noun count a machine with a flat wide belt used for moving objects from one place to another, especially in a factory a. used in a negative way to refer to situations in which people are treated as if they are products in a… … Usage of the words and phrases in modern English
conveyor belt — con veyor belt n a long continuous moving band of rubber, cloth, or metal, used in a place such as a factory or airport to move things from one place to another ▪ We lifted our baggage from the conveyor belt … Dictionary of contemporary English
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conveyor belt — noun a moving belt that transports objects (as in a factory) • Syn: ↑conveyer belt, ↑conveyer, ↑conveyor, ↑transporter • Derivationally related forms: ↑transport (for: ↑transporter), ↑ … Useful english dictionary
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