Selection and use of roller in belt conveyor

The roller is an important part of the belt conveyor, diverse and large quantities. It accounts for 35% of the total cost of a belt conveyor, with more than 70% resistance, so the quality of the roller is particularly important.
The role of the roller is to support the conveyor belt and material weight,The roller operation must be flexible and reliable.Reducing the frictional force of the conveyor belt with the roller is critical to the life of the conveyor belt above 25% of the conveyor assembly.Although the roller is a smaller part in the belt conveyor, the structure is not complicated, but it is not easy to create a high quality roller.
The maintenance costs of the rollers are an important part of the operating costs of the belt conveyor.So ask the roller: the structure is reasonable, durable, low resistance coefficient of rotation, reliable sealing, gray Dust, coal can not enter the bearing, so that the conveyor running resistance is small, save energy and extend the service life.

The roller is divided into steel roller and plastic roller.Steel roller is made of seamless steel pipe. The diameter of the roller roller is related to the width of the conveyor belt.General fixed conveyor standard design, the bandwidth B is 800mm below the conveyor, the choice of roller diameter φ89mm.Bandwidth 1000-1400mm Selection of roller diameter φ108mm.The idler can be divided into slotted rollers, flat rollers, buffer rollers and aligning rollers.In order to improve the productivity, transporting bulk material, supporting the conveyor belt heavy section of the upper roller generally used groove roller;The upper roller of the conveyor belt, the upper roller of the preferred conveyor belt of the coal preparation plant, and the lower roller which supports the conveyor belt back to the empty section are used.
The angle between the tilting roller and the horizontal roller axis in the slot roller is called the groove angle. The slot size is an important parameter for determining the transport material. China’s past belt conveyor, slot angle is generally 20 °.TD75 series design, slot angle with 30 °, also used 35 ° and 45 °. In the same bandwidth conditions, the groove angle from 20 ° to 30 °, conveyor conveyor bulk material cross-sectional area increased by 20%, traffic can be increased by 13%, and in the operation to reduce the material spilled.

The idler is a conveyor belt for belt conveyors and a carrier support device.The idler rotates with the operation of the conveyor belt to reduce the operating resistance of the conveyor. The quality of the roller depends on the quality of the belt conveyor, especially the service life of the conveyor belt. The sag between the adjacent belts of the conveyor belts generally does not exceed 2.5% of the pitch of the rollers.
Under the roller spacing is generally taken 3000mm or the upper roller spacing of 2 times; at the receiving material, the roller spacing of 300 to 600mm.The distance between the upper and lower rollers is 1/2 of the pitch of the horizontal section.The distance from the center line of the head of the conveyor head to the first set of troughs is generally 1 to 1.3 times the pitch of the upper rollers, and the distance from the tail roller to the first set of rollers is not less than the distance between the upper rollers. At the receiving material of the conveyor belt, a buffer roller shall be provided to reduce the impact and protect the conveyor belt;The construction of the cushion roller is basically the same as that of the general roller,Standard design using rubber and spring plate type two.Rubber factor is in the tube outside the package of a number of rubber ring;The spring plate is the bearing of the roller with elasticity to cushion the impact of the material.