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Analysis of NTN imported bearings
Source: China Bearing Network Time: 2014-08-28
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It is necessary to pay attention to the accurate and accurate collection of signals; in the usefulness, it is necessary to pay attention to the selection of the orientation and collection method of the measuring points. In order to accurately reflect the oscillation condition of the NTN imported bearings, it is necessary to organize the measuring points from the local bearing; the motor is usually free Rear fan cover; its measuring point is selected in the electric fan cover fixing screw has a better monitoring function. Others must pay attention to the repeated collection and analysis of the oscillating signal; induction is compared. Talent is finely determined.
Second, NTN imported bearings normal operation characteristics and useful diagnosis Tuen Mun NTN imported bearings in their application process showed a strong regularity; temporary production status monitoring found. And repeatability is very good. Normal high-quality bearings at the beginning of use; Oscillation and noise are comparable. The lamp is smashed 18. The ring is smashed and smashed. The beggar is smashed.
The oscillation and noise are kept at a certain level; after a period of motion, the spectrum is very simple; only one or two times the frequency is present. The spectrum of three times more power frequency is rarely presented; the bearing condition is very stable;
Bearing oscillation and noise start increase; after continuous operation, it enters the late stage of operation. Sometimes it shows an abnormal sound; but the change of oscillation increases slowly; at this moment; the bearing kurtness value starts to reach a certain value. It is thought that the bearing is the initial fault. .
The bearing is closely monitored for demand; at this time, close attention is paid to its change. Thereafter, the bearing kurtosis value is rapidly decreased at the beginning; and is close to the normal value; and the oscillation and noise start are significantly increased; When the oscillation crosses the oscillation specification (such as the ISO 2372 specification), its bearing kurtosis value also starts to increase rapidly; when it crosses the oscillation specification; and the kurtosis value also crosses the normal value (available kurtosis relative specification); that the bearing has entered Late disease production; need to repair equipment in time; replace NTN imported bearings.
The greater the capacity of the equipment; the bearing indicates the late-stage fault characteristics to the serious problem (usually bearing damage such as shaft, burn, sand frame spalling, raceway, bead wear, etc.) is not over one week. The faster the speed; The shorter the interval is. Therefore, the theoretical NTN imported bearing defects are diagnosed; once the late fault characteristics are found; the bearing should be judged to be faulty;
Third, NTN imported bearings abnormal operating characteristics and diagnosed tricks and the serious problems caused by these active bearings are often sudden and catastrophic, such as bearing cracks, cracks, internal and external ring cracking, etc.; now because of counterfeit and inferior bearings will inevitably enter Companies and equipment. These problems will form the rotor holding shaft; the heavy ones cause the rotor or equipment to be invalid. In recent years, I have often encountered such conditions in theory. Therefore; theoretical monitoring and diagnosis; must be diagnosed quickly NTN imported bearings in good condition Bad; and replace shoddy bearings in time; avoid major incidents. Many of these kinds of things; also piled up some useful tips; that is, such bearings in the initial operation of the equipment; monitor its oscillation; and spectrum analysis. Found that the bearing At the beginning of the operation; its spectrum has its common features; that is, the power frequency of the equipment usually does not occupy the primary component. However, the total value of the oscillation is not large; it is necessary to discriminate the oscillation with the oscillation specification (such as the ISO2372 specification), which is causing me to be alert; The condition indicates that there are defects in the bearing parts, etc.; the failure is often very fast and very violent. The above example is after the measurement of the figure two The rotor axle.
It is necessary to pay attention to the spectrum and oscillation time domain of the normal operation of the multi-pile normal bearing on the equipment; when these fake and shoddy bearing problems are diagnosed, it is convenient to identify the bearing fault in the case of presenting such anomalous spectrum; avoid equipment troubles.
Fourth, the useful NTN imported bearings quickly diagnosed the trick often only need to judge the quality of NTN imported bearings; theoretical situation monitoring. How long can be used; and fine analysis and diagnosis of a certain part of the bearing diagnosis is often not useful. The use of fine diagnosis is affected by factors such as working conditions; the characteristic frequency corresponding to NTN imported bearings is often not found. Although the wavelet analysis developed in recent years is more accurate than the rapid co-oscillation demodulation and analysis skills; Larger; more analysis is needed; the diagnosis of on-site defects is usually less used. The use of dimensional parameters and dimensionless parameters in the diagnosis of useful diagnosis is used to determine the diagnosis of bearing disease; that is, the frequency oscillation speed in spectrum analysis is used; The bearing kurtosis value is inductively diagnosed. When both conditions cross the specification; the bearing is faulty.
It proves that the diagnosis of NTN imported bearings is very useful for discriminating speed and accuracy; this method of judging through three years of theory. The accuracy rate exceeds 90%. The bearings that are diagnosed are basically in the late period; very good Economic benefits.
When monitoring the low-frequency oscillation of the NTN imported bearings is very large; other. sweeping the unit is not centered, unbalanced, loose layout, after the fundamental resonance layout elements; even if there is no NTN imported bearing characteristic frequency; should judge the NTN imported bearing problems Overhaul.
V. Useful spectrum analysis of NTN imported bearings and the kurtosis of the diagnosis of the door bearing; the data collector application has been widely used. However, it is useful to pay attention to the trick. The oscillation signal is not large. The spectrum is disorderly. When there is no problem; collect the oscillating signal; pass it to the computer for fine analysis. At this moment; first perform routine analysis; check whether the oscillation velocity spectrum and bearing kurtosis can be close to the specification; then use the power spectrum to investigate whether the oscillation energy can be overrun; The power spectrum is not large; investigate the various frequency components in the spectrum. If the spectral line corresponds to the frequency of the power frequency, it should focus on finding the faults in the layout of the unit. If it is a power frequency fraction, it will present more decimal frequencies. Focus on finding the frequency of the bearing; if there is; then there is a problem with the bearing; if not; need to be alert after sweeping other parts; strengthen monitoring. The theory finds that many oscillations do not overspend; and present a bearing fault case. Once the bearing characteristic frequency or near bearing Characteristic frequency spectrum; it should be judged that the bearing is faulty; then according to the amplitude value.
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