The diversity of conveyor rollers plays an important role in the conveying process. The roller consists of one or more rollers, each containing one or more bearings to ensure free rolling. The function in the conveyor is to support the entire conveyor belt to prevent it from stretching, ensure stable material operation of the conveyor belt, and reduce friction between the conveyor belt and the supporting rollers.

The roller can operate in harsh environments such as high humidity, extremely high or low temperatures. Different types of idlers can be used in different industries. What are the types of conveyor idlers in belt conveyor ? Through the following text, you will learn about different types of idlers in belt conveyor and their applications.

Different types of idlers

Idler is an important component of belt conveyors, with a wide variety and large quantity, which can support the weight of conveyor belts and materials. Different types of idlers in belt conveyor are applied in different industries, and the following are the types of conveyors.

Grooved roller

Trough type idlers are one of the most commonly used idlers for conveyor operation. The groove angle is usually 30 ℃ and is installed in the groove frame on the load side of the conveyor belt, often conveying bulk materials. The groove type roller is equipped with plastic sealing rings at both ends, which prevent grease leakage and ensure a fully sealed operation, allowing for long-term operation of the rolling shaft.

In addition, the use of groove rollers can reduce belt wear, extend the service life of the belt, and reduce operation and maintenance costs.

When using grooved idlers, the following precautions should be taken:

  • Prevent the conveyor belt from starting under load
  • Belt deviation, timely correction
  • To prevent the conveyor belt from being blocked by the frame, pillars, or block materials, and to prevent damage and tearing. When the bucket elevator detects local damage to the conveyor belt, artificial cotton should be repaired in a timely manner to avoid expansion.

Impact roller

The impact roller adopts a rubber ring design mainly used in the impact area of belt damage, providing buffering and absorbing impact force in the material impact area, reducing the downtime and maintenance costs caused by belt damage. Commonly used in quarries and mining industries.

Parallel idler

Parallel idlers are one of the important components of belt conveyors. It is a long roller and can be divided into two types: parallel upper roller and lower roller.

The parallel upper support roller is used for branch transportation of goods, and the lower support roller under pressure is called the lower support roller.

Centering roller

The aligning roller can be divided into parallel aligning roller and aligning roller, which are mainly used to adjust belt deviation.

Cushion roller

Buffer roller, installed below the conveyor, is mainly used to reduce the impact of falling materials on the conveyor belt at the receiving area and extend the service life of the conveyor belt.

When selecting buffer idlers, the following points should be noted:

  • Radial runout of the supporting roller
  • Roller flexibility
  • Axial displacement
  • Dust prevention performance of roller
  • Waterproof performance
  • Axial bearing performance of roller
  • Impact resistance performance of idlers

Carrying roller

The supporting conveyor belt carries the supporting rollers of the branch.

Return roller

The return idler is used to support the lower conveyor belt. There are parallel, V-shaped, and reverse V-shaped rollers. V-shaped rollers and anti V-shaped rollers can reduce the possibility of conveyor belt deviation. When V-shaped and anti V-shaped are used together to form a diamond cross-section, it can effectively prevent belt deviation.

What are the factors that affect the rollers?

  • The radial runout of the roller directly affects the stability of material transportation
  • The axial displacement directly affects the service life of the roller
  • Flexibility affects the service life of the roller and the tape, as well as the driving power of the entire machine
  • Waterproof performance affects the service life of the roller
  • Dust prevention performance affects the service life of the roller
  • Axial bearing capacity affects the service life of the roller
  • Impact resistance affects the service life of the roller
  • Rotating resistance affects the service life of the tape


  • The normal service life of the roller is over 20000 hours and generally does not require maintenance. However, according to the location of use and the size of the load, corresponding maintenance dates should be established, timely cleaning and oil injection maintenance should be carried out, and floating coal should be cleaned in a timely manner. Replace the rollers that have abnormal sounds and do not rotate in a timely manner.
  • When replacing bearings, it is necessary to make the opening of the bearing cage outward. After installing the bearing into the supporting roller, appropriate clearance should be maintained and it should not be crushed.
  • The labyrinth seal should be made of original accessories, and should be separately installed into the supporting rollers during assembly, and should not be assembled together.
  • When using the supporting roller, it is necessary to strictly prevent heavy objects from hitting the supporting roller tube.
  • To ensure the sealing performance and usability of the roller, it is prohibited to disassemble the roller at will.

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