Repair and management analysis of compressor bearing wear

In order for the production and development of enterprises to be better, equipment maintenance and management personnel must understand the wear and tear patterns of equipment, understand the structure and principles of equipment, know how to maintain equipment regularly, know how to install and repair equipment, scientifically and reasonably determine the time for major and medium repairs of equipment, use spare parts of equipment reasonably, and plan maintenance to restore equipment performance, in order to improve the ability of equipment technical management.

The main shaft and motor shaft of operating equipment such as compressors, fans, and centrifugal pumps are generally not easily worn or damaged, unless there is a large deviation in the alignment of the coupling, the locking nut of the bearing is not tightened, the tightening degree of the anchor bolt does not meet the requirements and loosens during equipment operation, or the assembly of the motor bearing is not in compliance with requirements, which will cause shaft wear and damage.

The damaged position of the shaft due to wear is usually on the bearing position, which is caused by the clearance between the bearing and the shaft, causing the equipment to not operate normally. The outer ring of the rolling bearing is the reference shaft, and the bearing seat hole that fits with it, some use the reference hole size, and some use the transition fit made by the base shaft; The inner circle of the rolling bearing is the reference hole, and the shaft that matches it is fitted with a small interference fit of the reference hole. The outer ring and bearing seat hole of rolling bearings are generally rarely worn, even for clearance fit bearings, the wear of the bearing seat hole is very slight. The abnormal operation of the equipment often results in heavy wear on the shaft bearings. If the bearing position is worn down, there will be a gap between the inner ring of the rolling bearing and the shaft, causing the bearing to run out of the inner circle. This requires repairing the bearing position of the shaft to achieve its original size.

There are three common methods for repairing bearing positions: one is to drill a dense "foreign hole" in the bearing position of the shaft, so that the inner ring of the bearing does not fit loose with the shaft, but the bearing position cannot be coaxial with the main shaft, and can only be temporarily repaired. Another method is to weld the bearing position, ensuring that the shaft does not deform as much as possible during welding. After welding, it is processed on the lathe. This repair can ensure the normal operation of the shaft, but the repair work is more complex. Another method is to apply metal repair agent on the worn bearing position, dry the repair agent, and manually repair it with a file, sandcloth, polishing machine, ruler, vernier caliper, etc. Due to manual repair, it is impossible to ensure that the repaired bearing position is coaxial with the main shaft, and there is also a deviation in diameter. During the test run, the equipment vibrates greatly, and some equipment cannot operate normally.