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How to inspect and measure bearings and common maintenance methods

by:JNSN     2021-12-22
1. Preparations before installing the bearing 1) Preparation of the bearing Since the bearing has been rust-proofed and packaged, do not open the package before the installation. Secondly, check whether the size, shape and processing quality of the shaft and the housing can fit the drawing. 2) Before the bearing of the inspection device of the shaft and the housing, apply mechanical oil to the mating surfaces of the shaft and the housing that have passed the inspection. In addition, the anti-rust oil coated on the bearing has good smoothness, and the bearings for common use or the bearings filled with smooth grease can be used directly without cleaning. However, for instrument bearings or bearings used for high-speed rotation, use clean cleaning oil to wash away the anti-rust oil. At this time, the bearings are easy to rust and should not be left for a long time. Clean the bearing and housing, and confirm that there are no scars or burrs left by machining. Abrasives (SiC, Al2O3, etc.) molding sand, cutting chips, etc. must not be inside the shell. 2. How to install the bearing. In most cases, we find the possible causes. Generally speaking, one third of bearing damage is caused by fatigue damage, the other third is caused by poor smoothness, and the other three are caused by fatigue. One part is due to pollutants entering the bearing or improper disposal of the device. In order to reduce bearing damage, the bearing must pay attention to the following points: 1. When using the device, the device must be carefully and accurately installed. As with other device bearings, it is not allowed to press hard, and it is not allowed to hit the bearing directly with a hammer, and it is not allowed. The pressure is transmitted through the rolling elements 2. As the saying goes, no sand should be rubbed in the eyes, and the bearing and its surrounding environment should also be kept clean. Needless to say, you know what's going on. Even if dust that is invisible to the naked eye enters the bearing, it will wear out the bearing. 3. Use appropriate and accurate equipment and tools as much as possible to use special tools, and try to prevent the use of cloth and short fibers. 4. When picking up the bearing by hand, wash away the sweat from your hands and apply high-quality mineral oil before stopping the operation. Pay special attention to rust prevention during the rainy season and summer.  We all know that the bearing is a fine part. It is requested to be quite cautious, that is, the use of high-performance bearings, if used improperly, the expected performance results will not be achieved, and the bearings are likely to be damaged. Most of the bearings are broken due to many reasons-beyond the original estimated load, ineffective sealing, too small bearing clearance caused by tight fit, etc. Any of these elements has its own special type of damage and will leave special damage marks. 3. There are several types of normal bearing maintenance 1. Regular maintenance: In order to ensure the normal operation of the main engine, according to the request of the main engine and the design theory and application experience of the bearing, a maintenance period is set and regular maintenance is performed. 2. Fault maintenance: When the bearing is faulty, shut down for inspection and maintenance. 3. Early-warning maintenance: applying advanced bearing fault diagnosis technology, real-time monitoring of the bearing's operating status, warnings before bearing faults, and stopping maintenance. During the operation of the bearing, there must be sound, temperature, and vibration. Therefore, with regard to the maintenance of the bearing in operation, abnormal changes in the bearing can be found by listening, touching, observing, and using bearing fault diagnostic equipment, and judging whether the bearing is in a normal working state according to the changed state.
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