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The motor shaft extension bearing burns down

The power of the motor equipped with the powder discharging machine in a thermal power plant is 220 kW and the voltage is 6 kV. Motor shaft extension uses 2322E cylindrical roller bearings, non-shaft extension uses 6322 deep groove ball bearings. In the operation of the motor in 2004, the temperature of the shaft end bearing rose sharply, the bearing oil cover changed color, and the burnt smoke appeared. Operation on duty after the shutdown of the inspection found that the motor shaft extension bearing burned, and the motor rotor locked.

1 Accident Investigation

After the accident, maintenance personnel disassembled the motor and found that:

(1) The motor shaft extension bearing is burned, the bearing frame and roller are severely worn and fall off, and the outer ring of the bearing is partially blue;

(2) There are obvious wear marks and deep cracks in the bearing chamber;

(3) There are many deep wear marks at the joint of the rotor shaft and the inner and outer oil cover;

(4) The oil cover inside and outside the motor shaft extension bearing is burned.

After the disassembly inspection, the maintenance records of the motor were checked and it was found that the bearings at both ends of the motor had been replaced two years ago. When replacing the bearing, it was found that there was a problem in the tolerance match between the motor shaft extension bearing and the bearing chamber, and the bearing slightly went out of circle, but it was not dealt with. After replacing the bearing, the motor was refueled only once in February 2004, and there was no maintenance record.

2 Cause Analysis

(1) The maintenance personnel did not deal with the defect of the outer circle of the bearing, resulting in heating and burning of the bearing after long-term operation.

(2) The maintenance personnel failed to fuel the motor in time.

According to the requirements of the regulations, the refueling cycle of this motor is 2 000 h; The cycle of cleaning bearings and replacing grease is 1 year. However, in more than 2 years of operation, only one refueling, and no grease replacement. Due to the poor operating environment of the motor and long-term operation, the oil quality deteriorates and the bearing lacks oil, causing the bearing to burn out.

(3) When the motor bearing is refueled, it is just in winter, the temperature is low, and the hardness of lubricating oil increases. Due to the improper operation method of refueling, the grease can not fully enter the bearing interior, and can not play a good lubrication role, resulting in the bearing burning.

(4) After finding the motor heating phenomenon, the operator did not immediately stop the faulty equipment with the local accident button, but reported to the leader first and then stopped the equipment, which prolonged the accident handling time and caused the accident to expand.

3. Preventive measures and countermeasures

(1) Replace the bearings at both ends of the motor, the bearing chamber at the shaft extension and the inner and outer oil caps, and repair the worn rotor shaft of the motor.

(2) Formulate "Regulations on Motor Bearing Refueling and Maintenance work", redefine and emphasize the supplementary refueling and overhaul period of motor bearings.

(3) Organize maintenance personnel to further learn motor maintenance procedures and improve their business skills. Strengthen the organization and management of equipment maintenance. At the same time, it is required that when refueling the operating equipment in winter, the motor bearing oil cover should be properly heated so that the new grease can fully enter the bearing interior.

(4) In the operation management of the equipment, it is required to strengthen the operation monitoring of the equipment with abnormal conditions (fever, abnormal sound, vibration), and timely maintenance of the equipment outage.


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