Roller, is an important part of the belt conveyor, many types, large number, can support the conveyor belt and material weight. It accounts for 35% of the total cost of a belt conveyor and generates more than 70% of the resistance, so the quality of the idlers is particularly important. It comes in steel and plastic.

The role of the roller is to support the conveyor belt and the weight of the material. Roller operation must be flexible and reliable. Reducing the friction between the conveyor belt and the roller plays a key role in the life of the conveyor belt, which accounts for more than 25% of the total cost of the conveyor. Although the roller is a small part in the belt conveyor, the structure is not complicated, but the manufacture of high-quality roller is not easy.

There are the following criteria to judge the quality of the roller: radial runout of the roller; Idler flexibility; Axial channeling momentum.