In order to keep the original performance of bearings in good condition for as long as possible, maintenance and overhaul are needed to prevent accidents before they occur, ensure the reliability of operation, improve productivity and economy. Regular maintenance shall be carried out in accordance with the operating standards for the operating conditions of the machinery. The contents include monitoring the running state, supplementing or replacing lubricating oil, and periodic disassembly inspection. As maintenance items in the operation process, there are bearing rotating noise, vibration, temperature, lubrication state and so on.
Bearing inspection and judgment
In order to determine whether the removed bearing can be used, please check the bearing after cleaning. Check the state of raceway surface, rolling surface, mating surface, cage wear, increase in bearing clearance and damage related to reduced dimensional accuracy, as well as abnormal conditions. For non-detachable ball bearings, support the inner ring horizontally with one hand and turn the outer ring to ensure that it is smooth.
Separate bearings, such as tapered roller bearings, can examine the rolling element of the outer ring and the raceway surface separately. As large bearings cannot be rotated by hand, please check the appearance of rolling elements, raceway surfaces, cages, ribs, etc. The higher the importance of bearings, the more careful the inspection. The purpose of bearing lubrication: the purpose of rolling bearing lubrication is to reduce the internal friction and wear of bearings and prevent combustion.
The lubrication effect is as follows:
1. Reduce friction and wear, prevent metal contact, reduce the friction and wear of contact parts such as rings, rolling elements and cages that constitute bearings.
2. Prolong fatigue life. In the process of rotation, if the rolling contact surface is well lubricated, the rolling fatigue life of the bearing will be prolonged. On the contrary, the oil viscosity is low, the lubricating oil film thickness is not good, so it is shortened.
3. Discharge friction heat, cooling, circulating oil method, etc., can use oil to emit heat generated by friction or heat transferred from the outside, and cooling. Prevent bearing overheating and lubricant aging.
4. In addition, it also has the function of preventing foreign bodies from entering the bearing interior, or preventing rust and corrosion.
Lubrication method: the lubrication method of bearings is divided into grease lubrication and oil lubrication. In order to make the bearing good performance, first of all, it is necessary to choose the lubrication method suitable for the use conditions and purposes. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication can simplify the structure around bearings and compare the advantages and disadvantages of grease lubrication and oil lubrication.
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