Bearing heating caused by improper installation of bearings in running motor
1. Design bearing fever caused by insufficient expansion
This situation is more likely to occur on long-axis equipment such as large wind turbines and crushers, which is also a relatively easy part of equipment design, manufacturing, installation and maintenance personnel.
Typical case CX company's rotary kiln rear exhaust fan has experienced intense heat generation at the free end of the fan at the initial stage of production. Because of the thermal expansion of the rotor main shaft and the bearing end cover after the thermal expansion of the rotor main shaft, the high temperature generated in a short period of time The bearing end cap and the rotor main shaft end face are welded together.
Therefore, when installing and accepting the new fan, it is necessary to pay attention to whether the axial clearance of the free end bearing can meet the expansion requirement of the working condition.
2, the bearing caused by the skew caused by the fever
If the bearing is installed in a skewed position, the ball will not roll in the correct position of the bearing raceway, or even cause a large axial end force of the ball end face and the inner race of the bearing seat and the outer race stop, causing the bearing to overheat.
If the bearing is not correct, it will take a lot of effort to check. The LY company's limestone crusher bearing heat is the case. The solution is to suck the dial indicator on the shaft, and the needle hits the end face of the bearing outer ring to check the end face jump. The end face runout value is controlled within 0.05. It is also possible to directly check the clearance on the left and right sides of the bearing with a feeler gauge.
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