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Ways to deal with the problems in bearing protection skills
Source: China Bearing Network Time: 2014-04-04
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First, the problem of bearing protection skills:
The two major clutters about bearing protection skills are: 1. When to change the oil. 2. How much oil should be changed. If the oil is too little, the bearing will be scrapped early. If the oil is too much, the bearing will be in trouble or long. Time damage power coils and coils.
Second, the bearing protection skills:
The resolution of what time is smooth and what time to stop the oil injection is very simple: the preparation of a bottom line, the preparation of the survey schedule and the timing of oil injection for monitoring.
1. It is proposed that the bottom line of a bottom line bearing is reflected in normal operation; no visual fault; the decibel strength under smooth conditions is satisfied.
Three ways to draw a bottom line:
1), analogy method: if there are multiple bearings of the same type; these bearings can be placed on a year-on-year basis. Use the same test method or investigate each bearing from the same viewpoint. Analyze the decibel strength and sound quality. If there is no essence The difference (less than 8 decibels); we can set it to the base decibel strength of each bearing.
2) Set the bottom line when adding smooth oil: When adding smooth oil; Listen to the intensity of the sound; When the sound intensity drops and then rise again. At this time; Do not add too much smooth oil; and set it as the bottom line .
3) Historical records: investigate the decibel strength of the bearing; record it every day; then compare the recorded results for 30 days. If the decibel strength is changed little or no change (less than 8 decibels); we can set this as the bottom line; The comparison of the results of future investigations.
2. Setting the survey timetable If the equipment criticality associated with total production, environmental results, and operational results is the main factor in selecting and setting up the evaluation mechanical system. When the root survey line is drafted, it is necessary to test once a month. Those high-decibel bearings that are smooth; should be detected more frequently; this will be able to investigate the changes that may occur. If a bearing is about to be destroyed, then the smooth oil can only temporarily cover the fault. However, the decibel strength will It quickly rises to reveal the existence of fault. In some cases, this appearance will appear in a few minutes; while others will take several days.
3. When it is smooth, if the decibel of a bearing exceeds the bottom line by 8 decibels; we think that the bearing demand is smooth. When we realize that the bearing demand is smooth; then know what time to stop the oil injection will avoid excessive smoothness. Can follow the following Three steps to complete:
1), based on the guidance of the bearing manufacturer to calculate the amount; then write smooth oil; not too much. This process is very one-sided; has nothing to do with ultrasound; and this process has never failed.
2) When the smooth oil is written, the smooth technician uses the ultrasonic instrument to detect the bearing. Gradually fill the oil until the decibel strength drops to the bottom line.
3) If there is no bottom line as a guide; the amount of smooth oil should be stopped when the sound drops and then rises. At this time; the skill should stop using smooth oil.
4. Ultrasonic bearing observation Ultrasonic observation or monitoring is the most reliable way to detect the initial (most beginning) of bearing damage. When the temperature rises or the sensation intensity of low frequency is strengthened, the ultrasonic wave will be the first to sound. When the bearing is over-utilized The initial stage of damage; when there is a shortage of smooth oil or smooth oil; it is useful to use this method of observing the bearing.
5. The signal that the loss is detected is like the spherical bearing with the same metal on the track; if the roller or ball bearing is over used at the beginning; it will have a slender deformation. This will result in an irregular appearance; Ultrasonic addition. Changes in the amplitude obtained from the initial readings indicate a clear one to two cases: early loss or shortness of smooth oil and initial bearing failure. If the ultrasonic wave exceeds the bottom line by eight decibels; there will be continued impact noise; The noise indicates a smooth oil loss (dull bearing appearance). If the ultrasonic reading exceeds the expected reading; when it reaches 12 decibels, there will be broken noise; this noise can be assumed that the bearing is now beginning to enter the lost form.
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