Roller conveyor is the device used to support the conveyor belt and the material loaded on the conveyor belt, to ensure the stable operation of the conveyor belt. It is an importantpart of belt conveyor, accounting for about 35% of the total cost of a belt conveyor. The idle drives the idler tube body, bearing seat and bearing outer ring and sealing ring through the friction force between the conveyor belt and the idler, and then conveys the material with the conveyor belt.