Bearing line failure of nine typical cases, attached to the bearing fault diagnosis method

For as long as possible to maintain the performance of the bearing, necessary care, testing and maintenance regularly, in order to prevent accidents from already, to ensure the bearing running strong. For long-term operation of the equipment, the usual test track is particularly important to detect the rotation of the project including the bearing state of sound, vibration, temperature, smooth agent, such as equipment maintenance personnel can accurately distinguish the problem points, early prevention and treatment plan. Bearing failure of nine typical condition 1. Dirt, foreign body, sand, or other contaminants into the box. Countermeasures: bearing box to clean clean, to change the new oil seal. 2. Water, acid, paint or other corrosive substances into the bearing housing. Countermeasures: device a maintainability dust cover, improve the oil seal. 3. Bearing in the hole is not round, distortions, the bearing surface. Action: check the bearing box, adjust the bearing surface, the adjusting shim. 4. Trunnion or set set of lock. Countermeasures: detection of trunnion, choose appropriate amount, lock tight sleeve again. 5. Unbalanced load, large hole clearance, outer ring hole slippage in box. Countermeasures: changing the aperture of bearing box comply with the design request. 6. Two or more bearing coupling, produce the axis line deflection Angle and bias. Countermeasures: readjust gaskets, make the axis of the coupling in line with constantly. 7. Incorrect installation, use hammer knock on the bearing directly. Countermeasures: standard unit bearings. 8. Bearing clearance is too large. Countermeasures: to adjust bearing clearance. 9. The equipment vibration. Countermeasures: find out the reason for the vibration, the corresponding treatment. Bearing fault diagnosis method 1) Abnormal sound analysis diagnosis of abnormal sound detection analysis is turn by the method of auscultation, bearing working condition to stop monitoring measures for the analysis of common tools is a long wooden handle screw whorls, also can use hard plastic tube diameter is about 20 mm. Relatively, using electronic stethoscope stop monitoring, more conducive to progress monitoring of sex. When the normal work of the bearing, stable running, light, no stagnation phenomenon, the onset of noise and without noise, can be heard on average and continuous 'sound' sound, or lower 'rumbling' sound. Bearing abnormal sound is a reflection of the problem are as follows: ( 1) Average bearing noise and continuous 'hissing' sound, the sound is produced by the outer ring, roller rotation and, contains a metal has nothing to do with the speed of irregular vibration noise. Ordinary performance for bearing inner fatliquoring lack of quantity, should stop. If the equipment downtime is too long, especially during the winter low temperature conditions, bearing during operation sometimes rustling 'hissing sound, with the bearing radial clearance to smaller and smaller work smooth grease penetration. The solution: should properly adjust bearing clearance, a change in penetration bigger new smooth fat. （ 2) Bearing in successive 'sound' sound of average cyclical 'wow' sound, the sound is due to the rolling body and inner and outer ring raceway scars, grooves, rust spot and provoked. Sound cycle is proportional to the speed of the bearing. The solution: dealing with bearing stop switch. （ 3) Bearing of irregular and uneven 'scrape' sound, the sound is due to the bearing inner into iron, sand and other impurities and provoked. Sound intensity is small, and the revolution did not contact. Stop cleaning the solution: dealing with bearing, to add fat or oil change. （ 4) Bearing a continuous and irregular 'rustling' sound, the sound normal and bearing inner ring and shaft fits too loose or outer ring and bearing hole fits too loose. The solution: sound intensity bigger, bearing the coordination relationship stop inspection, found that the problem timely repair. 2) Analysis of vibration signal of bearing vibration diagnosis is sensitive to bearing damage, such as peeling, indentation, rust, crack and wear will be reflected in the bearing and the vibration measurement. So, through the use of special bearing vibration zhangs gauge ( Frequency profiler, etc. ) Can measure the size of the vibration, through frequency distribution can infer the abnormal condition in detail. Rolling bearing fault detection diagnosis technology has a lot of kinds, such as vibration signal detection, smooth the oil analysis detection, temperature detection, acoustic emission testing, etc. Among various kinds of diagnostic methods, based on vibration signal of diagnosis technology application is the most common, the technology can be divided into simple diagnosis method and fine diagnosis method two kinds. Simple diagnostic application of the various parameters of the vibration signal waveform, form factor, crest factor, such as amplitude probability density, kurtosis coefficient, etc. , as well as a variety of demodulation technology of bearing stop preliminary discriminant to confirm whether the present problem; Careful diagnosis is used in all kinds of discrimination in modern signal disposal measures to diagnosis is thought to be presented bearing fault type and cause of the trouble. Related maintenance personnel demand control bearing failure of many possible reasons, makes the bearing of maintenance and improvement can be more scientific and reasonable, to ensure that the bearing is not due to any damage to shorten the use fixed number of year, and according to different failure mode in time to take some improvement measures, invent more economic benefits for the enterprise.