TIMKEN bearing common damage forms and basic elimination method

Check the actual load and rotating speed of the TIMKEN bearing whether there is a discrepancy with the original design, selection of the bearing is correct; Know the damage and damage near the end of the anomalies, especially the emergence of the noise and fever status and evolution; Check the power supply as well as the bearing of the adjacent in the presence of abnormal phenomena during mechanical components. Analysis of noise type, high and low tones, the interference frequency rhythm: pay attention to the temperature when the sudden increase in and so on, to write down the power supply and other parts; Figure out the configuration characteristics of bearing in the host and cooperate with the characteristics of judge whether configure it properly, write down the ring relative to the location of the shell and the position in relation to the direction of the load; The shaft by hand turned a few rounds with damaged bearing test to experience heavy degree, and then along the axial shaft driving back and forth a few times to experience the elastic axis along the axial degree, with the necessity of measuring the deflection of shaft; Check the TIMKEN bearing parts, lubrication; Check whether there is have an effect on bearing vibration source. Debris or particle source pollution sources, water, or fluid, can through the bearing current source; According to the inspection situation, can be used as a basis to judge the TIMKEN bearing of the damage was due to micro corrosion, abrasion, corrosion, or electric erosion. A, bearing fault diagnosis methods and key points for bearing condition monitoring and fault diagnosis of vibration analysis is practical method. Must pay attention to the signal acquisition is accurate, true and practical in the need to pay attention to choose the location of the measuring point and sampling method. To be truthful and accurate reflect the TIMKEN bearing vibration state. So to where the nearest bearing arrangement of measuring points, the motor fan cover after generally have free end, the selecting the fan cover screw has good monitoring effect. In addition must pay attention to many times of the vibration signal acquisition and analysis, comprehensive to match. Ability to get accurate conclusion. Second, bearing the characteristics of the normal operation of the bearing in the process of its use and practical diagnosis techniques showed strong regularity, temporary production condition monitoring. And the repeatability is very good. Normal quality TIMKEN bearings, at the beginning of the use of vibration and noise are relatively small, but there are some scattered of spectrum amplitude is small, may be due to some defects in the process of manufacturing, such as appearance burr. Maintain a certain level of vibration and noise, movement after a period of time. Spectrum is very single, only one or two times the frequency. More than three times the power frequency spectrum, seldom appears bearing condition is very stable, steady working period. After the bearing vibration and noise began to increase, continue to run late into use. Sometimes a different tone, but the change of vibration increase is relatively slow, at this point, the bearing kurtosis value began suddenly reaches a certain value. Think, this time the TIMKEN bearing is expressed as the early failure. Requires that the bearing is closely monitoring, at this time. Pay close attention to the change. Then, bearing kurtosis value began falling fast, and is close to normal, and significant increase in vibration and noise, it began to accelerate, increasing when vibration exceeds standard ( Such as ISO2372 specification) Its bearing kurtosis value also began to increase rapidly, when both beyond specification, vibration and kurtosis value is beyond normal, Available kurtosis relative standard) When that has entered the late bearing fault, should be timely maintenance equipment, replace the bearing. The equipment capacity, the greater the bearing fault feature late expressed to the severe fault ( For bearing damage, such as holding shaft commonly, burns, sand spallation, raceway, wear beads, etc. ) Most of time not more than a week. The faster the speed, the shorter the time interval. In actual bearing fault diagnosis, therefore, once found late fault characteristics, should be decisive judgment is bearing fault, arrange inspection as soon as possible. Three, bearing abnormal flow operation characteristics and diagnostic techniques and the bearing serious fault is often caused by sudden catastrophic such as bearing adhere to sudden rupture, bearing inner and outer circle deflagration fracture, etc. , now because of counterfeit bearings will inevitably enter the enterprises and equipment. These failures will cause the rotor shaft, the person that weigh cause rotor or scrapping. I practice in recent years, often encounter such a situation. Actual monitoring and diagnosis, therefore, necessary to diagnose the bearing as soon as possible state of good or bad, and change in time and inferior bearings, to prevent big accidents. A lot of this kind of accident, also accumulated some practical skills, is this kind of bearing in the early part of the device after operation, monitoring the status of vibration, spectrum analysis was carried on. Found bearing at the beginning of the run, and its frequency spectrum has its unique characteristics, namely the equipment power frequency is generally not of ingredient. But the vibration value is not big, with the vibration standard ( Such as ISO2372 specification) Determine vibration is qualified to cause me alert, at this time. This state indicates that the defects in TIMKEN bearing components, etc. , its failure is often very fast and very suddenly. In case that in two hours after measuring the figure rotor shaft.