Rollers are important components of belt conveyors, with a wide variety and large quantity. It accounts for 35% of the total cost of a belt conveyor and bears more than 70% of the resistance, so the quality of the rollers is particularly important.
The function of the idler is to support the weight of the conveyor belt and materials. The operation of the roller must be flexible and reliable. Reducing the friction between the conveyor belt and the idler roller plays a crucial role in the lifespan of the conveyor belt, which accounts for over 25% of the total cost of the conveyor. Although the idler roller is a small component in a belt conveyor and its structure is not complex, manufacturing high-quality idlers is not an easy task.
There are several criteria for judging the quality of the idler: radial runout of the idler; Flexibility of rollers; Axial displacement.
The influence of radial runout of rollers on belt conveyors:
Within the range of the jumping amount specified by the state, the belt conveyor can be kept running smoothly, otherwise it will cause resonance jumping of the belt conveyor, resulting in material spillage and environmental pollution. The higher the belt speed, the smaller the radial jumping amount, which is more advantageous. The national standard in our country specifies a measurement of 0.7 millimeters, while the Japanese JIS standard specifies a measurement of 0.5 millimeters.
The influence of roller flexibility on belt conveyors:
During the operation of a belt conveyor, the flexibility of the rollers is very important. If the flexibility of the rollers is poor and the coefficient of rotational resistance is high, the entire belt conveyor system will have to exert greater power, consume more electricity, and sometimes cause belt tearing, motor burnout, and in more serious cases, fire. Therefore, selecting rollers with low rotational resistance coefficient (preferably below 0.020) is an important aspect of the design and selection of belt conveyors.