Excessive bearing temperature is a common and harmful failure of mining machinery. If the cause is unknown and improper handling, it will often get twice the result with half the effort, which will reduce the service life of the bearing, increase the maintenance cost, and even cause the bearing to burn out. Therefore, quickly judging the cause of the failure and taking appropriate measures to solve it is the guarantee for the continuous and safe operation of the equipment.
First, the reason why the crusher bearing temperature is too high
There are many reasons for the overheating of bearings. The editor sorted out several common problems for you.
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.
2. Bearing wear Improper installation Insufficient cooling Large vibration Untimely inspection and replacement Bad bearing quality Improper bearing selection
When selecting a bearing, attention should be paid to the limit speed and load capacity of the bearing, and it should not be used in excess of the speed or load. This will only shorten the service life of the bearing, and the gain outweighs the gain.
Second, There are coups for cooling the crusher bearings
When the bearing temperature is high, the problem should be solved from the following aspects first.
1. When the amount of refueling is improper, too much or too little lubricating grease:
The bearing box should be oiled regularly according to the requirements of the work. After the bearing is refueled, sometimes the temperature is high, mainly because of too much refueling. At this time, the phenomenon is that the temperature continues to rise, and after reaching a certain point (generally about 10°C~15°C higher than the normal operating temperature), it will remain unchanged, and then gradually decrease.
2. When the added oil does not meet the requirements or is polluted:
If the lubricating grease is not selected properly, it is difficult to form a uniform lubricating oil film, and it cannot reduce the internal friction and wear of the bearing. Insufficient lubrication will cause the temperature of the bearing to rise. When different types of grease are mixed, a chemical reaction may occur, causing the grease to deteriorate, agglomerate, and reduce the lubricating effect. Contaminated grease will also increase the temperature of the bearing. Dust will fall into the grease during the process of adding grease, causing grease pollution, causing the grease inside the bearing box to deteriorate, destroying the bearing lubrication, and increasing the temperature.
Therefore, appropriate grease should be selected. During maintenance, the bearing box and bearing should be cleaned, and the refueling pipeline should be checked and cleared. Different types of grease are not allowed to be mixed; if other types of grease are replaced, the original grease should be cleaned first; during operation and maintenance Add grease regularly, and the grease should be kept properly for moisture-proof and dust-proof measures.
3. When the cooling is insufficient:
Check whether the pipeline is blocked, whether the oil inlet temperature and return water temperature exceed the standard.
If the cooler is not selected properly, the cooling effect is poor, and it cannot meet the requirements of use, it should be replaced in time or a new cooler should be installed side by side. The axial flow induced draft fan should also check the heat preservation and sealing of the core cylinder.
4. When there are no problems in the above aspects, check the coupling:
The alignment of the coupling must meet the process standards. When aligning axial-flow induced draft fans and hydraulic couplings, etc., the thermal expansion of equipment during operation should also be considered.
The impeller side of the induced draft fan expands due to heat, and the bearing box rises; when the temperature rises during the operation of the hydraulic coupler, the bearing box expands and the bearing rises, so the motor should be higher when aligning, and the reserved amount depends on the characteristics of the equipment and It depends on the temperature parameters in operation.
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