+86 18920794106
0102030405
China Suppliers Factory Impact Idler Roller - Corrosion-Resistant Rubber Buffer for Belt Conveyors
Performance and Advantages
The buffer roller is lightweight and has low rotational inertia. The specialized polymer material for rollers is lightweight, with a specific gravity of one seventh that of steel. Rollers made from this material weigh about half of ordinary rollers, have low rotational inertia, and low friction between rollers and belts.
Purpose
Buffer rollers are installed below the receiving section of the conveyor to reduce the impact of materials on the conveyor belt during material dropping, thereby extending the service life of the conveyor belt. The spacing between buffer rollers is generally 100–600 millimeters.
Standard Diameter Parameters
According to the Chinese national conveyor industry standards, there are four standard types of buffer roller diameters for belt conveyors with a belt width of 500mm–1400mm:
✦ ⌀89mm ✦ ⌀108mm ✦ ⌀133mm ✦ ⌀159mm
With the emergence of wide belt conveyors, the diameter of buffer rollers has also shown an increasing trend.
Installation and Selection
In terms of installation, the buffer roller is designed to increase the density of installation. It is also important to regularly inspect and replace damaged rollers in a timely manner. For conveyor belts with large drop heights, it is recommended to install buffer air locks and replace the buffer rollers with buffer beds.
In terms of purchasing, the following precautions should be taken based on the characteristics of the buffer roller:
✔ Radial runout of the roller
✔ Flexibility of the roller
✔ Axial displacement
✔ Dust and water resistance of the roller
✔ Axial bearing capacity of the roller
✔ Impact resistance of the roller
✔ Flexibility of the roller
✔ Axial displacement
✔ Dust and water resistance of the roller
✔ Axial bearing capacity of the roller
✔ Impact resistance of the roller
Protection
1
Buffer Roller Temperature Protection
When the temperature of the belt conveyor drum exceeds the limit due to friction with the belt, the detection device installed closely to the drum sends an overtemperature signal. After receiving the signal, the receiver delays for 3 seconds, causing the execution part to act, cutting off the power supply to the motor, and the conveyor automatically stops running, providing temperature protection.
2
Roller Group Speed Protection
If the conveyor malfunctions — such as the motor burning out, the mechanical transmission part being damaged, the belt or chain being pulled apart, or the belt slipping — the magnetic switch in the accident sensor SG installed on the driven part cannot be closed or cannot be closed at normal speed. At this time, the control system will follow the inverse time characteristic and after a certain delay, the speed protection circuit will take effect, causing the executing part to act and cutting off the power supply to the motor to avoid the accident from expanding.
3
Buffer Roller Coal Bunker Coal Level Protection
There are two coal level electrodes in the coal bunker — high and low. When there is no empty car in the bunker, the coal level will gradually rise. When the coal level reaches the high level electrode, the coal level protection will be activated. Starting from the first belt conveyor, each conveyor will stop one by one due to the stacking of coal at the tail of the machine.
Frequently Asked Questions (FAQ)
Q
What is a buffer roller and what is it used for?
A buffer roller (also known as an impact idler) is installed below the receiving section of a belt conveyor. Its primary purpose is to absorb and reduce the impact force of falling materials on the conveyor belt, thereby protecting the belt and significantly extending its service life.
Q
What are the main advantages of buffer rollers made from polymer materials?
Polymer-based buffer rollers offer several key advantages: they are lightweight (approximately half the weight of standard steel rollers), have a specific gravity about one-seventh that of steel, exhibit low rotational inertia, and produce minimal friction between the roller and the conveyor belt — all of which contribute to energy savings and reduced wear.
Q
What are the standard diameter sizes for buffer rollers?
According to Chinese national conveyor industry standards, the four standard buffer roller diameters for belt conveyors with belt widths of 500mm to 1400mm are: ⌀89mm, ⌀108mm, ⌀133mm, and ⌀159mm. Larger diameters are increasingly used with wide belt conveyor systems.
Q
What should be considered when selecting buffer rollers for purchase?
When purchasing buffer rollers, key selection criteria include: radial runout of the roller, rotational flexibility, axial displacement tolerance, dust and water resistance, axial bearing capacity, and overall impact resistance. These factors directly affect the performance and durability of the roller under operational conditions.
Q
What is the recommended spacing between buffer rollers during installation?
The spacing between buffer rollers is generally between 100mm and 600mm. For conveyor systems with large material drop heights, it is advisable to install buffer air locks and consider replacing buffer rollers with buffer beds to better absorb impact forces.
Q
What protection mechanisms are associated with buffer roller systems?
Buffer roller conveyor systems typically incorporate three key protection mechanisms: (1) Temperature protection — automatically shuts down the motor if drum temperature exceeds safe limits; (2) Speed protection — detects abnormal speed conditions caused by belt slippage or mechanical failure and cuts power accordingly; (3) Coal level protection — monitors coal bunker levels and sequentially stops conveyors to prevent overflow and coal stacking.