A certain power plant 2 a a fan motor drive end bearing abrasion situation investigation and analysis

A certain power plant 2 a fan motor drive end bearing wear a survey analysis of 2020 - 06 - 19 a fan motor technical data the occurrence of the incident: on January 30, 2017, 00 at 11 points, electrical maintenance tally researchers found 2 a fan motor drive end bearing has a different sound, and sound blunt, but temperature and vibration value conforms to the standard operation, to give its oil, voice of abating, observations for a week, bearing voice is not normal, open the small cover at the bottom of the oil box, smacked a bearing grease was found to contain a large number of yellow copper powder, preliminary judgment bearing wear serious, copper powder for bearing brass cage after wear and tear drops. Report the leaders agreed to after, through the coordination, on February 6, 2017, 20 electrical maintenance staff to a disintegration of fan motor inspection 2 a. Found: 1, in the drive end bearing models for NU234 cylindrical roller bearing wear, clearance is too large. 2, the spring gasket between the two plates bearing a little wear and tear. 3, remove the bearing NU234, pearl particles within the cage all fall off. 4, cage wear serious, has reached the bottom line. 5, motor drive the small cover in the end, and the big cover, bearing chamber, the oil baffle plate, stop ring, lock plate no wear conditions. Bearing wear characteristics: 1, the cylindrical particle surface has lost its luster, serious wear and tear. 2, cage outside diameter direction have obvious wear, pocket hole edge visible extrusion deformation, circular convex card slot have wear squeeze into oval, rivets have been broken off. Part 3, grease carbon black. After carbonization oil box remnants of oil residue, mix in residues have many brass scraps, chip brass plate shaped. Cause analysis: 1, keep on rolling bearing plays a equidistance isolation and prevent fall roller, roller guide and drive roller rotation. Rolling bearing at work, heat and wear caused by sliding friction bearing, especially under the condition of high speed, due to the effect of centrifugal force, accelerate the friction and wear with fever. 2, NU234 bearing for cylindrical guide bearing, when high speed motor, because of the bearing itself, plus the radial load, cylindrical cage and coat of the bearing in the circle into friction, as a direct result of cage wear. 3, after bearing cage wear will produce large amounts of copper scrap, copper scrap in resulting in bearing grease bead particle wear, after adding grease, produce copper scrap will be left outside into the small oil box cover. Bearing wear will produce motor vibration, but a fan motor weight is about 8 tons, the bearing vibration on the impact is not big, in the daily inspection, almost all motor vibration wire in 4 m ( Amplitude) Less than, after the maintenance staff to the grease can only maintain the balance of a period of time, when copper scrap wear into the slide again, will directly cause the damage of the oil film, listening to the voice of external blunt using sound, still in a state of lack of oil. 4, initially identified as bearing itself quality problem, 2 a) a fan motor assembly to now only for half a year, two plates bearing drive end, fan side a plate bearing, NU234 bearing wear serious, just drive on the cage were on the brink of apart. （ FAG bearings manufacturer, please participate in this paper analyzes the reasons of bearing wear, find out the problem, rooting out) Corrective and preventive measures: 1, strengthen patrol check, maintenance and repair work. Especially for large high voltage motor, detailed maintenance, maintenance plan. 2, the four sets of other equipment to conduct a comprehensive inspection, to reduce the motor equipment safety hidden trouble. 3, improve the electric motor repair procedures, assembly process of lean. 4, bearing in the assembly process to clean, position to put in place, savage homework is prohibited. 5, before the bearing installation, check the bearing appearance, by method of measuring the clearance of lead wire, can be used after qualified. Advice: 1, this unit in the process of bearing assembly, cleaning bearing internal cleansing agents, the bearing is a kind of hurt, because the bearing is # 45 steel is qualitative, cleaner have corrosion on its function, and cleaner less volatile. In view of this unit maintenance staff used to clean with kerosene, kerosene more impurities ( Kerosene after cleaning, reoccupy cleaner) The problem. Suggested motor bearing cleaning maintenance clean with gasoline, gasoline as the national standards, less impurities, decontamination capability, volatile, not easy to remain. When used to strict monitoring. 2, in strict accordance with the motor for oil cycle of motor for oil, and make records. 3, found the problem report in a timely manner, timely processing, will be treated as hidden dangers in the bud. 4, equipment maintenance in strict accordance with the assembly process, do maintenance, by an electric motor start-up is a new installation state. （ Source: web)