(1) December 12, 1995 of a catalytic B-302/3 Motor excessive vibration, the disintegration of grease deterioration was found, bearing damage, the fan-side bearing and the rotor shaft adhesion. The main reason is not replenish grease replacement, lubrication caused damage, bearing wear heat.

(2) January 2, 1996 liquefied gas J-3 # (JB0400S-12132kW) compressor motor bearing wear, gap, replace the new bearing, the bearing operation sound bad, noisy. 3 # lithium grease because the use of low viscosity, poor lubrication, resulting in noisy.

Cause Analysis

(1) rolling bearings rated load and speed limits are under the assumption that the conditions determined by the appropriate lubrication, and lubrication appropriate means to choose the right lubricant, the appropriate dose. I plant motors are used 3 # Lithium Grease, did not choose to use the appropriate grade of grease according to the working condition of the bearing. Such as: low-speed electric motor, 3 # Lithium Grease lower viscosity, can not form a good film, resulting in poor lubrication, bearing wear failure.

(2) flameproof motors used in our factory, most do not stop machine grease injection device makes it impossible to replenish, replace the grease, leading to insufficient grease, deterioration, so that lubrication damage, bearing wear failure.

(3) Since the Xinjiang large temperature difference between the temperature of a serious impact on the viscosity of grease, poor lubrication of the bearing. Summer temperatures up to 37 degrees, significantly reducing the viscosity grease, while winter temperature of minus 30 degrees to increase the viscosity of the grease, even agglomeration, so both can not form a good film, the bearing lubrication damage, wear failure.

other

The presence of defects (1) bearing itself, the quality problems affecting bearing life. Quality problems caused by the bearing itself, it is also more common in premature failure. Common are: bearing material defects, have a sandwich or slag; adverse material heat treatment, lack of surface hardness, which is mainly caused by the bearing inner ring wear, fatigue damage and deformation. Inadequate cage and the pin holding strength and other defects caused mainly premature rupture at the site of operation of punching machine load effect, the bearing failure. Since the bearing complex manufacturing process, manufacturing precision materials and processing are higher, lower pass rate bearing domestic bearing pass rate was about 30%, while incoming inspection of our plant bearing only their vibration, noise, etc. testing, analysis and other materials not be, can not guarantee the quality of use of the bearing, which is caused by one of the main bearing failure.

(2) the effect on the working conditions of the motor bearings also very large. Center deviation motor and its associated equipment, the motor foot loose rotor balancing bad or shaft bending etc. can cause abnormal vibration, bearing an excessive impact force, the bearing raceway surface and cage fatigue prematurely etc. damaged, and the motor inverter control, poor job or motor ventilation, lack of timely heating of the motor cooling at low frequencies, so that the bearing operating temperature and failure.