Fan bearing fault causes and treatment methods

According to incomplete statistics, cement plant fan abnormal vibration of 58 was achieved the highest failure rate. 6%, due to the vibration will cause imbalance of the fan operation. Among them, the improper adjustment bearing set fit, will lead to abnormal temperature rise of bearing and the vibration. As a cement plant during the period of equipment maintenance to replace the fan blades. Blades with sleeve and bearing seat is fixed on both sides to cooperate. To test occurs free end bearing high temperature, vibration value is on the high side of failure. Disassemble the bearing cover, manual slow rotary fan, found in the axis of a particular position of bearing roller, in the load section rolling condition, which can determine the bearing running clearance changes on the high side and installation clearance may be insufficient. Measured, bearing internal clearance is only 0. 4 mm, eccentric shaft of 0. 18mm。 To avoid, because of the large bearing span around a shaft deflection or bearing installation Angle error is more difficult, so large fan used can be adjusted automatically central spherical roller bearing. But when insufficient bearing internal clearance, bearing internal rolling movement due to space restrictions, the function of the automatic ecg, vibration value will rise. Bearing internal clearance decreases with increasing with the tightness, unable to form oil film, when bearing internal clearance due to the high temperature drop to zero, if the heat generated by the bearing running is still greater than the heat dissipation, bearing temperature will quickly climb. At this time, if you don't stop in time, the bearing will be burning. The bearing inner ring and the shaft with a tight is in this case, bearing the cause of the abnormal high temperature operation. Treatment failure, step down tight sleeve, readjust the matching of the shaft and the inner ring tightness, replace the bearing after the clearance from 0. 1mm。 Reinstall the fan starting, bearing vibration value and temperature back to normal. Bearing internal clearance is too small or poor parts design and manufacture of precision, the main reason is bearing operating temperature on the high side, for the convenience of the fan equipment installation, repairing and maintenance, generally in the design, use the set set of the bearing pedestal bearing bearing inner ring with tapered bore. But also easily because of the negligence of the installation program problems, especially the appropriate clearance adjustment. Bearing internal clearance is too small, and operating temperature rise sharply; Tapered bore the bearing inner ring is too loose and set fit, the bearing easily due to the loose fitting surface occurred fault loss in a short time.