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Excessive bearing temperature is a common and harmful fault of mining machinery. If the cause is unknown and the treatment is improper, the work will be doubled, which will reduce the service life of the bearing, increase the overhaul cost, and even cause the bearing burned out. Therefore, judging the cause of the fault quickly and taking appropriate measures to solve it are the guarantee of the equipment continuous and safe operation.
Reasons for excessive bearing temperature
There are many reasons why the bearing temperature is too high.
1. Poor lubrication.
Lubrication has an important influence on the service life, friction, wear and vibration of bearings. Good lubrication is the necessary condition to ensure the normal operation of bearings. According to statistics, about 40% of the bearing damage is related to poor lubrication.
The effect of lubrication on bearings mainly includes:
1) prevent metal corrosion.
2) prevent foreign matter from intruding and play a sealing role.
3) discharge friction heat to prevent excessive temperature rise of bearing.
4) reduce friction and wear and prolong bearing life.
The factors that usually cause poor lubrication of bearings are:
1) lack of lubricating oil (grease).
2) the lubricating oil pipe is blocked by foreign matter.
3) the quality of lubricating oil (grease) is defective.
4) did not add lubricating oil (grease) on time.
5) lubricating oil (grease) contains impurities.
2. Bearing wear
As an important part, bearings are used in all kinds of large and small machinery, and some machinery (such as crushers) work in a dusty environment. When some fine dust enters the high-speed operation of the bearing seat, resulting in deterioration of lubricating oil or grease in the bearing seat, poor lubrication, and then bearing wear.
Bearings continue to operate under wear condition, because of the increase in friction, heat increase, resulting in the bearing temperature rise.
3. Improper installation
Improper installation is another important reason for bearing heating. Because the correctness of the bearing installation has a direct impact on its life and the accuracy of the main engine, it is necessary to overlap the center line of the shaft and the bearing hole.
If the bearing is not installed correctly, low precision, bearing deflection, rotation will produce torque, causing bearing heating or wear. In addition, the bearing will also generate vibration, and the increase of noise will also increase the temperature.
4, insufficient cooling
Insufficient cooling usually manifests as blockage of pipes, improper selection of coolers and poor cooling effect.
Scaling and clogging of coolers in lubricating pipelines will lead to poor cooling effect, especially in summer production. Individual manufacturers do not hesitate to increase or even connect series cooler to enhance the cooling effect.
Cooler fouling is serious, bearing temperature too high frequency alarm will be encountered in many production sites, the more effective treatment is to carry out acid cleaning of the cooler before summer every year.
5. Great vibration.
For example, the coupling alignment process does not meet the requirements, rotor dynamic and static imbalance, poor foundation rigidity, foot virtual, rotating stall and surge.
Some rotors in the course of operation due to corrosion or solid impurities wear, or shaft bending, will lead to unbalanced centrifugal force, so that bearing heating, vibration, raceway serious wear, until damage.


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