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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Rolling bearing fault diagnosis Rolling bearing fault diagnosis
The use of rolling bearings in equipment is very extensive; the condition of rolling bearings is directly related to the operation of rotating equipment, especially in the production of large continuous production; many are used in important parts of large rotating equipment; therefore; the production of rolling bearings is monitored and faulty in practice. Confirmation of diagnosis is an important part of equipment repair and handling. We have practiced and explored through long-term practice; we have accumulated some useful tips for the diagnosis of rolling bearings. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
First, the method of diagnosis of rolling bearing problems and the key to the conditional monitoring of rolling bearings and the diagnosis of fault diagnosis is a vibration analysis.
In the usefulness, it is necessary to pay attention to the selection of the orientation and collection method of the measuring point. In order to accurately reflect the oscillation condition of the rolling bearing, it is necessary to pay attention to the accurate and accurate collection of the signal; therefore, it is necessary to organize the measuring point in the local area with high bearing ratio; Rear fan cover; its measuring point is selected in the electric fan cover fixing screw has a better monitoring function. Others need to pay attention to the repeated collection and analysis of the oscillation information; induction is compared.
Second, the characteristics of the normal operation of rolling bearings and useful diagnosis of the door we found in the long-term production monitoring; rolling bearings in their use of the process shows a strong regularity; and repeatability is very good. Normal high-quality bearings at the beginning use; oscillation And the noise is comparable. The lamp is smashed 18. The ring is slashed and smashed. The beggar is smashed.
After a period of motion; the oscillation and noise remain at a certain level; the spectrum is very single, only one or two times the frequency. It rarely shows three times the frequency above the power frequency; the bearing condition is very stable; enter the stable operation period.
After the continuous operation, the use is late; the bearing oscillation and the noise start increase; sometimes the abnormal sound is present; but the change of the oscillation increase is slower; at this moment; the bearing kurtness value starts to reach a certain value. We think that the bearing is the initial Faulty.
At this time; the bearing should be closely monitored; pay close attention to its change. After that; the bearing kurtosis value starts to decrease rapidly; and it is close to the normal value; and the oscillation and noise start increase obviously; it increases the undulation and starts to accelerate; When the oscillation exceeds the oscillation specification (such as the ISO 2372 specification); its bearing kurtosis value also starts to increase rapidly; when it exceeds the oscillation specification; and the kurtosis value also exceeds the normal value (available kurtosis relative specification); we think that the bearing Has entered the late stage of disease; need to repair equipment in time; replace the rolling bearing.
Bearings exhibit late-stage fault characteristics to present severe problems (usually bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) that do not exceed one week at all times; the larger the equipment capacity; the faster the speed; The shorter the interval, thus; in the world of rolling bearing fault diagnosis; once the late fault characteristics are found; should determine the bearing fault; quickly organize maintenance.
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Rolling bearing fault diagnosis
Source: China Bearing Network Time: 2018-07-05