C&K MOSAIC , https://www.cnkmosaictile.com
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>The occurrence of tumbling bearing problems and the diagnosis method 2 The cause of rolling bearing problems and the diagnosis method 2
3 The detection of bearing faults is currently diagnosed in China. There are roughly methods for measuring temperature, noise and vibration parameters. The method of measuring temperature and noise is simpler; but it lacks useful preventive effect; once the bearing temperature is over during operation High and high noise; usually think that the locomotive bearings have reached a relatively serious degree of damage. The method of measuring vibration parameters is used; when the locomotive is in the middle and small repairs, the bearings are tested; because it is convenient to obtain and collect information in the test. Abbreviation; compared to the application of the middle section to promote the use; is a simple and useful detection method. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
3.1 The diagnosis of locomotive bearings There are two main methods for locomotive bearings: (1) simple diagnosis of locomotive bearings; (2) locomotive bearing resonance demodulation spectrum analysis skills ---- fine diagnosis.
3.1.1 Simple diagnosis; that is, in the vibration detection, it is usually through the test of certain vibration parameters.锒 锒 锒 锒 锒 锒 锒 锒 锒 锒 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ 虿ㄇ K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K K The working condition is not sensitive; when the bearing tooth surface operation appearance is faulty; the impact pulse of the running surface defect will occur every revolution; the larger the fault; the larger the impact response amplitude; the faster the KV value rises; but the bearing fault In the later period, the KV value is reduced, while the KV value is lower; the opposite is true; it is not sensitive to early problems; but it rises with the bearing defects; the stability is better. Totally; It is appropriate to use the kurtosis coefficient and the comparison value together; it co-ordinates the sensitivity and stability of the diagnosis parameters.
Traction motor bearing ground detection threshold Spring Wind 4 locomotive axle box bearing top wheel detection threshold is easy to diagnose and has a better side; but there are also many shortcomings; when the bearing is easily diagnosed; the following conditions will be presented (1) bearing parameter value is faulty; but can not determine its fault location; (2) the bearing itself is not faulty but because of the problems formed 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 larger); thus the error is judged according to the parameters. The above three conditions are analyzed; Simple diagnosis does not determine the method of bearing component problems; can not solve the problem of "discriminatory repair"; therefore, bearing diagnosis is only impossible by simple diagnosis to determine whether there is any problem; it is necessary to carry out fine diagnosis.
3.1.2 Fine diagnosis When the bearing is damaged, such as fatigue peeling, partial wear, surface corrosion, etc.; bearing and rolling rotation will take turns to crush these external damage; high-speed inner ring rotation will make this kind of grinding The impact of the impact wave; the longitudinal wave caused by this fault is emitted outward at the speed of sound before the data is deformed; it has a steep frontal waveform and an extremely rich spectrum; followed by the internal damping effect of the data; the longitudinal wave of the impact is sharply attenuated; The sensor receives the impact pulse signal. The impact pulse waveform is approximately rectangular; the error frequency of the rectangular pulse is extremely wide; and the natural frequency of the bearing system and various types of sensors is very low; therefore, the bearing system and various types of communication room sense The natural frequency of the device is masked by the frequency of the impact pulse; the frequency of the fault provokes the resonance of the bearing system and various types of sensors; the use of the passband filter to filter out unwanted low and high frequency noise (such as various types of noise such as mechanical vibration) only makes The fault shock pulse provokes the bearing outer ring or the sensor resonance echo waveform to pass; and the low frequency fault signal is expanded Progress and echoes the vibration damping system of higher frequency vibration; envelope demodulation of the higher frequency echoes will be further expanded to open the low-frequency signal; by converting a low frequency spectrum analyzing instrument; spectrum is demodulated.
4 Cases of locomotive bearing diagnosis The following example is the case of the left side axle box bearing detected by the 4th spring wind 7D0034 locomotive on January 27, 2002; the bearing type 752732. It is tested by JL-501 bearing test bench; the speed is 500 rev / Minute.
The time domain waveform detected the diagnostic parameters; the kurtosis coefficient is 6.6, and the high kurtosis is also severely overrun; thus the test result is unqualified. Together with the refinement spectrum, the peak of the demodulation spectrum is 60HZ; The peak distances of 1, 2, and 3 are 60HZ; the frequency of bearing faults is calculated according to the hook of the locomotive bearing fault frequency table: 500×0. 12=60HZ; the faulty part is found from the table as the bearing outer ring; in the subsequent differentiated bearing Found that the outer ring raceway is a little eroded and crushed.
Recommend to friends comments close window Bearing related knowledge Bearing use - metal exercise and processing
KOYO cylindrical roller bearing distinguishes the authenticity of NSK bearing. Details of the iron spectrum analysis of the rolling bearing. The noise characteristics and countermeasures of the motor bearing
This article links to http://
Please indicate the bearing network http://
Previous:General bearing code under the code: FAG bearing separate device problem elimination method
The cause of rolling bearing problems and the diagnosis method 2
Source: China Bearing Network Time: 2018-06-19