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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.
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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.
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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:
- Ø 89mm
- Ø 108mm
- Ø 133mm
- Ø 159mm
With the emergence of wide belt conveyors, the diameter of buffer rollers has also shown an increasing trend.
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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.
Key purchasing considerations: radial runout of the roller • flexibility of the roller • axial displacement • dust and water resistance • axial bearing capacity • impact resistance
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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, mechanical transmission parts being damaged, the belt or chain being pulled apart, or 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 follows the inverse time characteristic and, after a certain delay, the speed protection circuit takes 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.
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Frequently Asked Questions
Q
What makes buffer rollers lighter than standard steel rollers?
Buffer rollers are made from a specialized polymer material with a specific gravity of only one-seventh that of steel. As a result, rollers made from this material weigh approximately half as much as ordinary steel rollers, significantly reducing rotational inertia and belt friction.
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Where are buffer rollers installed on a conveyor system?
Buffer rollers are installed below the receiving section of the conveyor belt, directly beneath the material loading or drop point. Their purpose is to absorb the impact force of falling materials and protect the conveyor belt from damage.
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 widths of 500mm–1400mm are: Ø 89mm, Ø 108mm, Ø 133mm, and Ø 159mm. Larger diameters may be used for wide belt conveyor applications.
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What is the recommended spacing between buffer rollers?
The spacing between buffer rollers is generally 100 to 600 millimeters, depending on the conveyor configuration, material weight, and drop height requirements.
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What protective functions does a buffer roller system provide?
Buffer roller systems include three main protection mechanisms: temperature protection (shuts down the conveyor when drum temperature exceeds limits), speed protection (detects abnormal roller speed caused by mechanical failures), and coal bunker coal level protection (automatically stops conveyors when the coal level reaches the high-limit electrode).
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What should be considered when purchasing buffer rollers?
Key factors to evaluate when selecting buffer rollers include: radial runout accuracy, roller flexibility, axial displacement tolerance, dust and water resistance rating, axial bearing capacity, and overall impact resistance. These characteristics directly affect the roller's durability and the conveyor belt's service life.
Boao Rubber
