First, the method and key points of rolling bearing fault diagnosis
A practical method for condition monitoring and fault diagnosis of rolling bearings is vibration analysis.
In practice, you need to pay attention to the location and acquisition method of the measuring point. In order to accurately and accurately reflect the vibration state of the rolling bearing, it must be noted that the collected signal is accurate and true. Therefore, the measuring point should be arranged in the nearest place to the bearing. Generally, there is a rear fan cover at the free end of the motor, and the measuring point is selected in the fan cover fixing screw. Good monitoring results. In addition, it is necessary to pay attention to the multiple acquisition and analysis of the vibration signal, and comprehensively compare. To get an accurate conclusion.
Second, the characteristics of rolling bearings normal operation and practical diagnostic techniques
In the long-term production status monitoring, we found that the rolling bearing showed strong regularity during its use and the repeatability was very good. Normal high-quality bearings are relatively small in vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.
After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the bearing status is very stable and enters a stable working period.
After continuing to run, the bearing vibration and noise begin to increase, and sometimes abnormal sounds occur, but the vibration increase changes slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that the bearing is an initial failure at this time.
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