Simple diagnosis means that in the vibration detection, the size of some vibration parameters is generally tested, and the state of the imported bearings is judged by comparison with the standard value (threshold value). In the simple diagnosis of the imported bearings of the locomotive, the time domain is mainly selected. The KV acceleration RMS parameter Xrms of the wave kurtness coefficient parameter is used as the fault judgment parameter. The kurtosis index KV is a dimensionless parameter, which is sensitive to the early fault of the imported bearing and is not sensitive to the operating conditions. When the bearing is imported When the working surface of the tooth surface is faulty, the impact pulse at the working surface defect will be generated every revolution. The larger the fault, the larger the amplitude of the impact response, the faster the KV value rises, but the KV is deteriorated with the late stage of the imported bearing failure. The value is reduced, while the opposite is the opposite. It is not sensitive enough to the early failure, but it rises with the failure of the imported bearing failure and the stability is better. In short, it is appropriate to obtain a reliable diagnosis of simple diagnosis, and it is appropriate to apply the kurtosis coefficient and the comparison value. It takes into account the sensitivity and stability of the diagnostic parameters. Traction motor imported bearing ground detection threshold Dongfeng 4 locomotive axlebox imported bearing top wheel detection threshold simple diagnosis has a better side, but there are also many shortcomings, when the imported bearing for simple diagnosis, the following will occur Several situations;
(1) The value of the imported bearing parameters is faulty, but the fault location cannot be determined.
(2) The imported bearing itself has no fault but is caused by failure during assembly (such as rotor dynamic imbalance, shaft misalignment, etc.).
(3) When the sensor is placed in the machine base, the measured fault signal is strong and weak (the inner ring is the smallest, the roller is strong, and the outer ring is large), so the error is judged according to the parameters. Through the analysis of the above three cases, the simple diagnosis does not determine the method of the failure of the imported bearing components, and can not solve the problem of "depending on the situation". Therefore, it is not enough to diagnose the fault of the imported bearing only by simple diagnosis, and it is necessary to carry out precise diagnosis.
When there is a problem with the imported bearings, the first idea should be to check the repairs, not to replace them. Today, we introduce the common types of repairs for the world's top imported bearings.
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