This article is about industrial conveyor belts. Point of contact between a power transmission belt and its pulley. A conveyor belt uses a wide belt and pulleys and is supported by rollers or a flat pan belt conveyor pdf download its path. One or both of the pulleys are powered, moving the belt and the material on the belt forward.
Belt conveyors are generally fairly similar in construction consisting of a metal frame with rollers at either end of a flat metal bed. 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. 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. Primitive conveyor belts were used since the 19th century. In 1972, the French society REI created in New Caledonia the longest straight-belt conveyor in the world, at a length of 13.
Hyacynthe Marcel Bocchetti was the concept designer. 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. Louisiana-based company, registered the first patent for all plastic, modular belting. It is common for belts to have three layers: a top cover, a carcass and a bottom cover.
The purpose of the carcass is to provide linear strength and shape. The warp refers to longitudinal cords which characteristics of resistance and elasticity define the running properties of the belt. The weft represents the whole set of transversal cables allowing to the belt specific resistance against cuts, tears and impacts and at the same time high flexibility. The covers are usually various rubber or plastic compounds specified by use of the belt. Steel conveyor belts are used when high strength class is required.