For equipment such as bucket elevators and inclined belt conveyors that require loading to stop and reverse, the supporting Flanders reducer will be equipped with a backstop. Once the backstop fails, it will cause the conveyor belt to reverse and slip material, or even cause a major safety accident in which the equipment overturns. When repairing a backstop failure, there are several key points that are easily overlooked.
1. The most common backstop failure is failure and slippage, which cannot prevent the equipment from reversing. In many cases, problems will still occur after replacing a new backstop. In fact, the root cause is that the input shaft or mounting seat is not processed to the correct size. The inner ring of the backstop and the shaft are an interference fit. If the fit gap is too large, the inner ring will rotate with the shaft when the backstop is working, and the outer ring will slip if it does not rotate, and it will not function as a backstop at all. When replacing the backstop, you must measure the size of the shaft. If the shaft is worn and the size is too small, you must first repair the size of the shaft and then install a new backstop, otherwise it will be useless no matter how many times you replace it.
2. Another problem is that the rotation direction is reversed during installation. The backstop can only stop in one direction. If it is installed backwards, it will definitely not work. Before installation, be sure to confirm the rotation direction according to the equipment manual. After installation, you must manually test the rotation to confirm that the forward rotation is flexible and the reverse rotation locking is OK before installing the machine. In addition, the backstop needs regular lubrication. Many users neglect lubrication during maintenance. The rollers or wedges inside the backstop will be short of oil for a long time and will wear and become stuck, causing them to lock up during normal operation and burn out the motor and input shaft. The backstop with a grease nozzle must be filled with the corresponding grease as required every three months. Do not add more or less grease. Filling it full will cause the backstop to heat up and fail. If the backstop is seriously overheated, it is generally due to poor lubrication or internal wear. It should be disassembled and inspected in time. If it is severely worn, it should be replaced directly. Do not operate it when it is sick to avoid causing greater safety accidents.
