Conveyor belt  From Wikipedia, the free encyclopedia
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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,fines,and lumps material.   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
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