Analysis and Disposal of Bearing Faults in Cement Machinery (3)

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Analysis and Disposal of Bearing Faults in Cement Machinery (3)

Source: China Bearing Network Time: 2013-03-26
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(7) Corrosion. Red or brown stains appear on the raceway of the raceway, steel ball, cage and the inner ring; indicate that the bearing is corroded due to exposure to corrosive liquids or gases. It will cause oscillations to increase. Large, increased wear, radial clearance, preload reduction; and fatigue failure under extreme conditions. The solution is to discharge the liquid from the bearing or add the entire and external seal of the bearing.
2 The cause and problem of the bearing problems of the fan are not completely counted; the abnormal rate of the vibration of the fan in the cement plant is 58.6%; the oscillation will form the imbalance of the working of the fan. In the meantime, the adjustment of the bearing set is improperly adjusted. Will cause abnormal temperature rise and oscillation of the bearing.
For example, a cement plant replaces the fan blades at the time of equipment repair. The fixed sleeves on both sides of the bucket are fixedly coupled with the bearing of the bearing housing. The test of the free end of the bearing from the beginning of the test is high; the oscillation value is high.
Disassemble the upper cover of the bearing seat; manually reverse the fan; find the bearing roller in a certain orientation of the shaft; also roll over in the non-load area; thus it can be concluded that the bearing working gap changes too high and the device gap can be lacking According to the measurement, the internal clearance of the bearing is only 0. 04mm, and the deflection of the shaft is 0. 18mm.
Because the left and right bearing span is large; it is difficult to prevent the deflection of the rotating shaft or the error of the bearing device; therefore, the large fan uses a spherical roller bearing that can be adjusted by the active centering. However, when the internal clearance of the bearing is lacking; Constrained by the movement space; its active centering function is affected; the oscillation value will increase instead. The internal clearance of the bearing decreases with the increase of the cooperation tightness. The 薹ㄐ 蠡湍ぃ fan 蠡湍ぃ 敝岢 敝岢 敝岢 敝岢 湎 蛭The law of drip 闶 诵 诵 攘 攘 攘 攘 攘 . . . . . . . . . . . 攘 攘 攘 攘 攘 攘 . . . . . . . . . . . . . . . . .. The tight cooperation with the shaft is the reason for the abnormal high temperature of the bearing work in this example.
When disposing; retract the adapter sleeve; adjust the cooperation tightness between the shaft and the inner ring from the beginning; take the gap after replacing the bearing to take 0. 10mm. Start the fan from the end of the head device; the bearing oscillation value and working temperature are all normal.
The internal clearance of the bearing is too small or the manufacturing accuracy of the parts is the main cause of the high working temperature of the bearing; to facilitate the installation, disassembly and protection of the fan equipment; usually, the inner ring of the tapered sleeve bearing is selected in the drawing. Bearing housing bearings. But it is also easy to cause problems due to negligence in the program; especially the adjustment of proper clearance. The internal clearance of the bearing is too small, the working temperature rises rapidly, and the inner ring cone of the bearing cooperates with the adapter sleeve too loosely; It is easy to burn out in the short term due to the loosening of the cooperation surface.
3 Conclusion In summary, bearing faults; should pay attention to the description, protection of smooth handling, operation and other aspects. This can reduce the repair costs of mechanical equipment; extend the working rate and service life of mechanical equipment.
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