The belt conveyor is mainly composed of two end rollers and a closed conveyor belt tightly covered thereon. The roller that drives the conveyor belt to rotate is called the driving roller (drive roller); the other roller that only lies in changing the moving direction of the conveyor belt is called the redirecting roller. The driving roller is driven by a motor through a speed reducer, and the conveyor belt is dragged by the friction between the driving roller and the conveyor belt. Drive rollers are generally installed at the discharge end to increase traction and facilitate dragging. The material is fed from the feeding end, falls on the rotating conveyor belt, and is conveyed to the discharging end by the friction of the conveyor belt.