精选优质文档-倾情为你奉上原文： CONVEYOR SYSTEMS Conveyors are used when material must be moved in relatively large quantities between specific locations over affixed path. The fixed path is implemented by a track system, which may be in-the-floor, above-the-floor, or overhead. Conveyors divide into two basic categories: (1) powered and (2) no-powered. In powered conveyors, the power mechanism is contained in the fixed path, using chains, belts, rotating rolls, or other de
