The roller is an important part of the belt conveyor, with many types and large quantities. It accounts for 35% of the total cost of a conveyor and generates more than 70% resistance, so the quality of the roller is particularly important.

The role of the conveyor roller is to support the weight of the conveyor belt and the material. The operation of the roller must be flexible and reliable. The function is to support the belt, reduce the running resistance of the belt, and make the verticality of the belt not exceed a certain limit to ensure the smooth running of the belt. Reducing the friction between the conveyor belt and the idler 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 idler is a small part in the belt conveyor, the structure is not complicated, but it is not easy to make a high-quality idler.

The basic types of rollers:

(1) The rollers are classified into self-aligning rollers, buffer rollers, trough rollers, and parallel rollers according to their uses. The function of the self-aligning roller is to correct the deviation of the belt of the belt conveyor. Usually, a rotary groove-shaped self-aligning roller is installed on the heavy-duty section of the conveyor, and a parallel self-aligning roller is installed on the no-load section. The buffer roller is applied to the tailstock of the machine according to the actual situation. When receiving the material, it can reduce the impact of the material on the belt, which is beneficial to the service life of the long belt. The trough-shaped roller is generally composed of two side rollers and a flat roller. The groove angle is generally 30 degrees. For a detachable belt conveyor, the three rollers of the trough-shaped roller are hinged to each other, so Called hinged roller. The parallel roller is generally a long roller, which is installed at the lower end under pressure, so it is called the lower roller.

(2) The rollers are divided into two types: steel rollers and plastic rollers. There are three types of bearing seats for rollers: cast iron, stamped steel plate and phenolic plastic.