Correct judgment of rolling bearing operation law knowledge and fault - bearing
Rolling bearing in the use process showed a strong regularity, and the repeatability is very good.
The normal high quality bearing (
, 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 surface caused by burrs, etc.
Movement after a period of time, maintain a certain level of vibration and noise, frequency 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.
Continue to run into the use of late, after rolling bearing vibration and noise began to increase, sometimes a different sound, but the change of vibration increase is relatively slow, at this point, the bearing kurtosis value began suddenly reaches a certain value.
We believe that the rolling bearing is characterized by the early failure.
At this point, requires close monitoring of the rolling bearing, pay close attention to the change.
Since then, bearing kurtosis value began falling fast, and is close to normal, and significant increase in vibration and noise, it began to accelerate the increase, when the vibration more than standard (
Such as ISO2372 standard)
, its bearing kurtosis value also began to increase rapidly, when more than vibration standard, and kurtosis value is more than normal (
Available kurtosis relative standard)
When we think of bearing fault has entered the late production, should be timely maintenance equipment, change of rolling bearing.
Late fault character of rolling bearing to 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 bigger the equipment capacity, the faster the speed, the shorter the time interval.
Therefore, in the actual fault diagnosis of rolling bearing, once found late fault characteristics, should be decisive judgment is bearing fault, arrange inspection as soon as possible.