A thermal power plant, the row of the motor power with powder machine for 220 kW, the voltage is 6 kV. Motor shaft stretched by the 2322 E cylindrical roller bearing, the shaft by 6322 the stretch deep groove ball bearing. In 2004, the motor in the operation, the shaft bearing temperature out there the dramatic increase in oil, bearing cover becomes angry, and by the smoke appeared anxious burnt flavour. Running the officer on duty after downtime examination revealed that the motor shaft bearing burned down the stretch, and motor rotor lock.
1. The accident investigation
After the accident, maintenance staff to check the disintegration of the motor, and found that:
(1) the motor shaft bearing burned down the stretch, bracket, roller badly worn, fall off, bearing outer ring local into blue;
(2) bearing room has obvious wear traces, and accompanied by deep crack;
(3) rotor shaft and inner and outer side cover oil where, at deep grinding mark;
(4) motor shaft bearing inner side and outside the stretch oil cover burned.
After disintegration of inspection, and check the motor maintenance records, found in 2 years ago has motor replacing bearing on both ends. In the replacement of bearing, it was found that the motor shaft bearings and bearing the stretch room tolerance matching problem, bearing a slightly go round the phenomenon, but not for processing. Replace bearing, the motor only in February 2004 added come on time, in addition, there are no maintenance record.
2. The cause analysis
(1) maintenance staff not to go round the defects of bearing processing, the lead to bearing in a long period running fever, burned to the ground.
(2) timely maintenance staff to motor bunkering maintenance.
According to the instruction, the motor cycle for 2000 h added come on; Cleaning bearing, change the cycle of grease for 1 year. But in more than two years of operation, adding only come on time, and has not changed grease. Due to the motor running environment is bad, and long-term operation, make the qualitative change of poor, oil bearing oil, cause bearing burned.
(3) the motor bearing oiling, squarely in winter, and the temperature is low, lubricating oil increase hardness. Because refueling operation method is undeserved, cause fat can't fully into the bearing internal, not a good lubrication, cause bearing burned.
(4) operation personnel found in motor with fever after phenomenon, is not in situ in accident emergency service button fault equipment, but first report to the leader, and service equipment, prolong the accident treatment time, cause an accident to expand.
3. Prevention measures and countermeasures
(1) change motor shaft bearings, stretched out on both ends the bearing rooms and the inner and outer side oil cover, and to wear the motor rotor shaft to be repaired.
(2) make the motor bearing oiling maintenance regulations, to clear and emphasize motor bearing added come on and overhaul cycle.
(3) organization maintenance staff further study motor maintenance procedures, improve business skills. Strengthening the management of equipment maintenance. At the same time requirements, in winter to operation equipment added come on, should be appropriate to motor bearing heating oil cover, in order to make new grease can fully into the bearings inside.
(4) in the operation of equipment management, asked to appear unusual (fever, has a strange sound and vibration) strengthen the equipment operation monitoring, and timely service of equipment maintenance.



Other News:
How to prevent high voltage motor bearing not being burned
Greek parties vow bailout changes as votes come in
Running for President?How Embarrassing!
Striking new tone, Chris Christie says education reform is led by GOP
Mr Lang's beat Mr Sarkozy won the election
Seau's friends didn't see any warning signs
Lawyer: Edwards knew money was for his benefit
Wall Street set for flat open as retailers weigh