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Treatment of motor bearing and rotating shaft failure

wallpapers Tech 2020-05-27
Generally, after the motor is operated for 3 to 5 years, the bearing may be damaged. Therefore, when the motor is disassembled and overhauled, the bearing must be carefully inspected and repaired.
After the bearing is damaged, the motor will overheat the bearing during operation, and emit abnormal noise. In severe cases, the motor cannot run. When inspecting the internal defects of the bearing, quickly push the periphery by hand, and it can be roughly judged according to its rotation. If it is stable when turning. There is no vibration, sway or backward phenomenon, the rolling sound is slight, the finger feels greasy, and it gradually slows down and stops on its own, indicating that the bearing is good. If it makes a noise and vibrates and sways when turning, it stops suddenly like a brake when it stops, or even reverses and reverses, indicating that the bearing is defective and can no longer be used.
 
When the bearing is damaged, it can be repaired as follows:
 ① Clean the bearing.
 ② Remove rust spots. Available if there are rust spots on the outer surface of the bearing. Wipe with an emery cloth, then clean it with gasoline. If there is a slight rust on the ball or raceway, you can ignore it; if the rust is serious, you can immerse it in kerosene for l ~ 2 h, and then slide the outer ring of the bearing in the positive and negative directions by hand multiple times. The friction between the slide rails removes the rust spots, then cleans them in kerosene, and then turns the outer ring of the bearing by hand multiple times until the rust spots are completely removed.
 ③When the inner and outer rings of the bearing are not parallel, the stop should be cleaned, and all end cover bolts should be screwed into the screw holes of the machine base and tightened by a symmetrical synchronization method.
④When the inner and outer ring ends of the bearing are not on the same plane, if the outer ring protrudes outward, the inner cover of the bearing can be shortened; if the outer ring protrudes inward, the inner cover of the bearing can be lengthened. () -Shaped gaskets can be used for reinforcement.
⑤ The requirements for the axial clearance between bearing rings are shown in Table 4-13. When the allowable value is exceeded, a new bearing should be replaced.
⑥When the bearing is out of repair, such as out-of-round, cracked or severely worn, it should be replaced with a new bearing.

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Tag: motor bearin