Roller types: Spherical roller conveyor for adjusting the deviation, resin rollers, to prevent hunting, resin roller model, to ensure the stable operation of the conveyor belt. Forward curved trough-aligning roller also played for the role. Buffer roller mounted below the feed section of the conveyor by the resin roller plant, reducing the impact on the conveyor belt to extend the belt life. Roller works: roller driven by friction between the belt and the idler roller tube, the bearing and the bearing outer ring, ring rotary motion, and the conveyor belt and to achieve together with its transport logistics. Roller factors: roller radial runout (the indicators directly affect the stability of the material transport).