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What is the problem of the bearing temperature being too high? Collect these solutions quickly

What is the problem of the bearing temperature being too high? Collect these solutions quickly

Excessive bearing temperature is a common and harmful failure of rotating equipment. If the cause is not clear and the treatment is improper, it will often reduce the service life of the bearing, increase the maintenance cost, and even burn the bearing. Therefore, quickly determining the cause of the excessively high bearing temperature and adopting appropriate solutions are the guarantee for the continuous and safe operation of the equipment.

There are many reasons that cause the bearing temperature to be too high, the common ones are as follows.

1. Poor lubrication

Lubrication has an important impact on the service life of the bearing and friction, wear, vibration, etc. Good lubrication is a necessary condition to ensure the normal operation of the bearing. According to statistics, about 40% of bearing damage is related to poor lubrication. The main effects of lubrication on the bearing include: preventing metal corrosion; preventing foreign matter from intruding and playing a sealing role; dissipating frictional heat to prevent excessive temperature rise of the bearing; reducing friction and wear and prolonging the life of the bearing.

The factors that usually cause poor bearing lubrication are: insufficient lubricating oil (grease), lubricating oil pipe blocked by foreign matter, etc., the quality of lubricating oil (grease) is problematic, and the lubricating oil (grease) and lubricating oil (grease) are not added on time. Contains impurities.

2. Bearing wear

Bearings, as an important part, are used in various large and small machines. Some machines (such as crushers) have a lot of dust in the working environment. When part of the fine dust enters the high-speed bearing housing, the lubricating oil or grease in the bearing housing will deteriorate. , Poor lubrication, and then wear and tear on the bearing. Bearings continue to run in a worn state, due to increased friction and heat increase, resulting in an increase in the temperature of the bearing.

3. Improper installation


Improper installation is another important reason for bearing heating. Whether the bearing is installed correctly or not has a direct impact on its life and the accuracy of the main engine. Therefore, the center line of the shaft and the bearing hole must be coincident during installation. If the bearing is installed incorrectly, the accuracy is low, and the bearing has deflection, torque will be generated during rotation, which will cause the bearing to heat up or wear. In addition, the bearing will generate vibration, increase the noise, and increase the temperature rise.

Four, insufficient cooling

Insufficient cooling is usually manifested as: pipeline blockage, improper selection of cooler, poor cooling effect, etc. The fouling and clogging of the cooler of the lubrication pipeline will cause the cooling effect to deteriorate, especially in summer production, this problem is especially common. Individual manufacturers do not hesitate to increase or parallel series coolers to enhance the cooling effect. The cooler has serious fouling and frequent alarms for excessive bearing temperature are encountered in many production sites. A more effective solution is to pickling and descaling the cooler before the beginning of summer each year.

Five, inspection and replacement are not timely

If the bearing is found to be severely fatigued, peeling, oxidized, rusted, worn pits, cracks, or excessive noise that cannot be adjusted, if it is not replaced in time, it will cause the bearing to generate heat, abnormal noise, vibration, etc., which will affect the normal Production. In addition, the vibration caused by improper disassembly of the bearing and the loosening of equipment anchor bolts can also cause indentations on the bearing raceways and rolling elements, and cracks in the inner and outer races of the bearing. During the operation of the bearing, the inspection should be carried out according to the specified period.

6. Poor bearing quality

Rolling bearing parts work for a long time under high alternating contact stress in the form of point contact or line contact. The accuracy, life and reliability of the main engine are largely determined by the bearing. Therefore, it is necessary to pay attention to the inspection during the purchase and acceptance of the bearing, and use qualified and high-quality products from regular manufacturers.

When the bearing temperature is high, the problem should be solved from the following aspects.

1. When the amount of lubrication is improper, the lubricating grease is too much or too little, the bearing box should be refueled regularly according to the requirements of the work. High temperature sometimes occurs after the bearing is refueled, mainly due to excessive refueling. At this time, the phenomenon is that the temperature continues to rise, and after reaching a certain point (usually about 10°C to 15°C higher than the normal operating temperature), it will remain unchanged, and then gradually drop.

2. When the added grease does not meet the requirements or is contaminated: the selection of lubricating grease is not suitable, it is not easy to form a uniform lubricating oil film, it is impossible to reduce the internal friction and wear of the bearing, the lubrication is insufficient, and the bearing temperature rises. When different types of grease are mixed, a chemical reaction may occur, causing the grease to deteriorate, agglomerate, and reduce the lubricating effect. Contaminated lubricating grease will also increase the temperature of the bearing. Dust will fall into the grease process, causing grease pollution, resulting in the deterioration of the grease inside the bearing box, which will damage the lubrication of the bearing and increase the temperature.

Therefore, appropriate grease should be selected, the bearing box and bearings should be cleaned during maintenance, and the fueling pipeline should be inspected and dredged. Different types of greases are not allowed to be mixed; if replacing other types of grease, the original grease should be cleaned first; operation and maintenance are in progress Grease is added regularly, and the grease should be properly kept for moisture and dust prevention measures.

When the cooling is insufficient, check whether the pipeline is blocked, whether the inlet oil temperature and the return water temperature exceed the standard. If the cooler is not properly selected and the cooling effect is poor, and cannot meet the requirements of use, it should be replaced in time or a new cooler should be installed in parallel. The axial flow induced draft fan should also check the insulation and tightness of the core tube.

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