Bearing the failure of nine typical symptoms, attached to the bearing fault diagnosis methods - bearing knowledge

For as long as possible to maintain the performance of the bearing, must be regular maintenance, testing and maintenance, in order to prevent accident arrangement to ensure the reliability of the bearing operation. For long-term running equipment, tracking detection is particularly important at ordinary times, the rotation of the test items include bearing the sound, vibration, temperature, the state of the lubricants, such as equipment maintenance personnel can accurately judge the problem points, early prevention and solution. 1 bearing the failure of nine typical symptoms. Dirt, foreign body, sand, or other contaminants into the box. Countermeasures: bearing box to clean clean, replace the new oil seal. 2. Water, acid, paint or other corrosive substances into the bearing housing. Install a protective countermeasures: dust cover, improved 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, choosing the right amount, to lock tight sleeve. 5. Unbalanced load, large hole clearance, outer ring hole slippage in box. Countermeasures: replacement meets the design requirements of aperture bearing box. 6. Coupling of two or more bearing, axis linear deviation and angular deviation. Countermeasures: readjust gaskets, make the axis of the coupling in a straight line. 7. Incorrect installation, use the hammer knock on the bearing directly. Countermeasures: specification bearing installation. 8. Bearing clearance is too large. Countermeasures: to adjust bearing clearance. 9. The equipment vibration. Action: find out the vibration reason, do the corresponding processing. Bearing fault diagnosis method 1) Abnormal sound analysis in the diagnosis of abnormal sound detection analysis is turn by auscultation method on the analysis of the bearing condition monitoring method, commonly used tools are long wooden handle screw whorls, can also use the hard plastic tube diameter is about 20 mm. Relatively, the use of electronic stethoscope monitoring, more conducive to improve the reliability of monitoring. When the normal work of the bearing, stable running, light, no stagnation phenomenon, the sound of harmony and no noise, can be heard even and continuous 'sound' sound, or lower 'rumbling' sound. Bearing abnormal sound is a reflection of the failure are as follows: ( 1) Bearing a homogeneous and continuous 'hissing' sound, the sound is produced by the outer ring, roller rotation and that contains a metal has nothing to do with the speed of irregular vibration noise. General performance for the bearing inner fatliquoring quantity is not enough, should be added. If the equipment downtime is too long, especially during the winter low temperature circumstances, bearing during operation sometimes rustling 'hissing sound, with the bearing radial clearance to smaller and smaller work grease penetration. The solution: should be appropriately adjust bearing clearance, replacement penetration bigger new grease. ( 2) Bearing in successive 'sound' sound issued a uniform periodic 'wow' sound, the sound is due to the rolling element and the inner and outer ring raceway there scars, grooves, rust spot. Sound cycle is proportional to the speed of the bearing. Solution: bearing for replacement. ( 3) Bearing a irregular and uneven 'scrape' sound, the sound is due to the bearing inner into scrap iron, sand and other impurities. Sound intensity is small, is not connected with the revolution. Solution: cleaning should be made for bearing with fat or oil change again. ( 4) Bearing a continuous and irregular 'rustling' sound, the sound general and bearing inner ring and shaft fits too loose or outer ring and bearing hole fits too loose. Solution: sound intensity bigger, bearing the coordination relationship between check to repair in time when problems found. 2) Vibration signal analysis in the diagnosis of bearing vibration is sensitive to bearing damage, such as peeling, indentation, rust, crack and wear will be reflected in the bearing and the vibration measuring. So, through the use of special bearing vibration tester ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency distribution can infer the abnormal situation. Rolling bearing fault detection diagnosis technology has a lot of kinds, such as vibration signal detection, lubrication oil analysis detection, temperature detection, acoustic emission testing, etc. Among various kinds of diagnostic methods, based on the vibration signal of diagnosis technology most widely used, the technology can be divided into simple diagnosis method and precise diagnosis method two kinds. Simple diagnosis using 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 for bearing a preliminary judgment to confirm whether a failure; Precise diagnosis with various kinds of modern signal processing method to judge the simple diagnosis is considered a failure of bearing failure type and reason. Related to the maintenance personnel need to master the various possible failure modes of the bearing, which makes the maintenance and improvement of bearing more scientific and reasonable, to ensure that the bearing is not due to accidental damage to shorten the use fixed number of year, and according to different failure forms certain improvement measures in time, create more economic benefits for the enterprise.