Bearing Detection by Vibration measuring instrument
In the operation of INA imported bearings, although the ISO2372 standard judges whether the vibration exceeds the standard by vibration velocity, special attention should be paid to the change of bearing acceleration in the field practice. Most of the bearing damage process is fatigue damage, which is generally manifested as the obvious increase of acceleration. With the development of fatigue, the vibration velocity and displacement increase gradually, which indicates that the bearing has fatigue failure. When testing bearings, we should pay careful attention to whether the vibration value has unstable wobble (it is suggested to use analog pointer instrument, which can be observed very obviously). If there is wobble, it indicates that there is an unstable wobble. With the unstable vibration signal, the acceleration is also large, especially the speed increases at the same time, it is very likely that there is a bearing "sleeve" fault.
For the new equipment, although the vibration is very small and conforms to the national standard, there is a small amplitude vibration swing phenomenon in the bearing part, and after eliminating the bearing matching problem (playing sleeve), it is very likely that there are problems in the geometric size of the bearing, such as the bearing steel ring ellipse, when the rolling body passes through the elliptical long shaft position, it may be caused by the reduction of the clearance that the rolling body will be stuck to death in an instant, and the subsequent rolling body will continue to extrude. The sliding friction of the rolling body is caused, and each rolling body will appear sliding friction here, resulting in unstable signal. This problem is encountered in the detection of Shanxi 220KW new motor, disassembly probe, test bearing, prove that the judgment is complete. Correct.
In bearing testing, do not ignore the change of bearing acceleration value. Acceleration can predict the failure of rolling bearing at an early stage.