TIMKEN bearings a wide range of applications on the device, directly related to the rotation of the bearing device running, especially in continuous production enterprises, widely used in large rotating equipment vital parts and, therefore, actual production made TIMKEN bearing condition monitoring and fault diagnosis is important part of improving maintenance and management of equipment. Our long-term practice and trial and error, a backlog of bearing fault diagnosis of actual practical skills.
1, TIMKEN bearing fault diagnosis approach and points
TIMKEN bearing condition monitoring and fault diagnosis method of vibration analysis.
In the practical need to pay attention to the location of the measuring point and acquisition methods. To be true and accurate reflect the TIMKEN bearing vibration, care must be taken to capture the signal accurate real, therefore the bearing nearest local arrangements of measured points, the motor fan cover after the free end, measuring points selected in the fan cover fixing screws have better monitoring effect. Many times also must note on vibration signal acquisition and analysis, comprehensive comparisons. To get an accurate conclusion.
2, TIMKEN bearing characteristics of normal operation and practical diagnostic skills
We found in the long-term production status monitoring, TIMKEN bearing in its demonstrated uses a high level of regularity, and repeatability is very good. Normal quality bearings when used at the beginning, vibration and noise are small, but some scattered spectrum, amplitude is small, probably due to some defects in the manufacturing process, such as Burr on the surface.
Movements over time, maintaining a certain level of vibration and noise, spectrum is single, only Yi、erbei. Rarely occur more than three times times the frequency spectrum, bearing is very stable and entered a phase of steady work.
Continued to run into use later, bearing vibration and noise began to increase, sometimes abnormal noise, vibration increases more slowly, at this point, bearing kurtosis value suddenly reaches a certain value. In our view, when the bearing is in the form of the initial fault.
At this point, would require close monitoring of the bearing, pay close attention to the changes. Thereafter, bearing towering degrees value and began quickly declined, and close to normal, and vibration and noise began significantly increases, its increased significantly began accelerated, dang vibration over vibration standard Shi (as ISO2372 standard), its bearing towering degrees value also began quickly increases, dang both over vibration standard, and towering degrees value also over normal value (available towering degrees relative standard) Shi, we believes that bearing has entered advanced fault etc, needed timely maintenance equipment, replaced TIMKEN bearing.
Advanced features to the serious defect in the performance of the bearing (usually bearing damage such as axle crack, burn, sand, Raceway, wear beads and so on) most of the time not more than a week, larger capacity, faster speeds, shorter intervals. Therefore, actual TIMKEN bearings fault diagnosis, advanced fault features once they are discovered, there should be decisive judgment bearing failures, as soon as possible repair.
3, TIMKEN bearing characteristics of abnormal operation and diagnosis techniques
Now fake bearing will inevitably enter the enterprise and equipment, and these movements bearing serious fault is often caused by sudden, disastrous. Inner and outer rings of the bearing and bearing cage suddenly break, burn bursting fracture, which will cause the rotor axle, causing rotors or equipment scrap. In recent years, we often encounter such situations in practice. Therefore, in the actual monitoring and diagnosis must be diagnosed with TIMKEN bearings State as soon as possible, and to replace the counterfeit bearings to avoid accidents. We are in a large number of such incidents, also gained some practical tips is that the bearings in the early running after installation, monitoring their vibration, and spectral analysis. We found bearing in the early running, its spectrum has its own unique characteristics, frequency are generally not the main ingredients of that equipment. Vibration total value of much vibration standards (such as ISO2372) determine the vibration is qualified.
At this point, our vigilance, this State is characterized by inadequacies of the bearing components such as, failure is often very fast and very suddenly. Cases in this measurement on rotor axle two hours after.
In the diagnosis of these fake bearing failure, accumulated to take the usual spectrum of high quality bearings in the normal operation of the equipment and vibration time-domain situation, facilitate this kind of exception occurs when spectrum can determine bearing fault in time, prevent accidents.
4 rapid diagnosis of TIMKEN bearings, practical skills
In our actual condition monitoring, often simply judge the TIMKEN bearings, how long, and sophisticated analysis and diagnosis of fault diagnosis of bearings in a part are often little practicality. Practical precision in diagnosis of the condition and other factors, often can't find the TIMKEN bearings correspond to the characteristic frequency. Although in recent years the development of a total number of fast Wavelet analysis and vibration analysis of demodulation technology more accurate, but the equipment required a substantial investment in, still needs to be more analysis, onsite troubleshooting personnel typically have fewer applications. We take on the practical diagnosis of dimensional parameters and binding judgment of dimensionless parameters for fast fault diagnosis of bearings, which frequency spectral analysis of vibration velocity, a comprehensive diagnosis of bearing with kurtosis value. When both conditions are when the standard is exceeded, our judgment bearing failure.
This method of judging after three years of practice, prove on TIMKEN bearings fault diagnosis is very practical. Judge speed, accuracy, accuracy over 90%. Fault diagnosis of bearings are at an advanced stage, with very good economic benefits.
In addition, when it comes to monitoring to the TIMKEN bearing low-frequency vibrations are very large, excluding unit misalignment, imbalance, loose structure, after the structural factors underlying resonance, even without bearing characteristic frequency, decisive judgment TIMKEN bearing fault maintenance.
TIMKEN bearings 5, practical spectral analysis and diagnosis techniques
Data collectors now use has become more widespread. But note in the practical skills. Little vibration, bearing kurtosis less vibration signal spectrum complex, difficult to judge at the scene when there is trouble-free, vibration signal acquisition we will come back, spread to computer precision analysis. At this point, the first general analysis, check whether the vibration velocity spectra and bearing kurtosis near, then the power spectral investigation on vibration energy over whether, if power spectrum is unlikely, observation of frequency components in the spectrum. If spectral lines corresponding to frequency frequency multiple, you should focus on finding fault in the unit structure; if frequency several times, frequency of occurrence more decimal places, you should focus on finding bearing offerings often, if so, the bearing failure, if not, exclude other parts requiring vigilance after a failure to strengthen monitoring. Actually found a lot of vibration is not exceeded, bearing failures and examples. Frequency characteristics of bearing once or close to the bearing characteristics of frequency spectrum, you should determine bearing faulty, then depending on the size amplitude, trend analysis or arrangements could be made for inspection.

 


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