Impact rollers are used at the feeding point of belt conveyors to reduce the impact of falling materials on the conveyor belt. They are mainly developed for corrosive environments such as coal washing plants, coking plants, and chemical plants.
They have more than 10 times the toughness of ordinary metals and a lifespan five times that of traditional column shoes. They are corrosion-resistant, flame-retardant, anti-static, and lightweight, and are widely used in mining. The polymer material specifically designed for the roller body has mechanical properties similar to bronze, excellent wear resistance, and good self-lubricating performance, without damaging the belt. The impacting roller has superior anti-corrosion performance. The roller body and sealing components are made of polymer materials, which are corrosion-resistant. When used in corrosive environments, the service life can reach more than 5 times that of ordinary rollers.
The following are the three protective functions of the impact roller:
(1) Impact 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 over temperature 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, the belt slipping, etc., the magnetic switch in the accident sensor SG installed on the driven part of the conveyor 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) Impact 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.
The impact 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. In terms of installation, the impact roller is designed to increase the density of installation.The second is to regularly inspect and replace damaged rollers in a timely manner. For conveyor belts with large drop heights, it is recommended to install impact air locks and replace the impact rollers with impact beds.
