Matters needing attention in working bearing inspection

Source: China Bearing Network Time: 2018-05-26

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It is increasingly important to look at the situation of the transfer in the work and to complete the full inspection plan in advance. In the meantime, the bearing is the focus; because it is the most important rotating part of all the transfer; situation monitoring is an important one to avoid protection. Ring. Early detection of bearing damage to avoid non-planned equipment stops due to bearing damage.
Especially in important machines or in harsh environments, the bearings should be viewed frequently; the market has presented quite a number of systems and instruments; used to monitor bearings; most of these instruments are based on oscillation measurements.
However, not all instruments are equipped with these leading instruments. In this case, it is necessary for the transfer staff or protection engineer to maintain a high degree of vigilance against the "error signal" of the bearing; for example, noise, temperature and oscillation. "Listen" , "Contact" and "Investigation" are three important methods. The following views can be used as your reference.
1. Listening to the use of hearing to identify irregular work is a very general approach. For example, using electronic stethoscopes and mechanical listening needles to detect abnormal noise of a part is often experienced by the staff. Being in an excellent work situation will announce a low snoring; if a sharp voice, voice, and other irregular sounds are announced; it generally indicates that the bearing is in poor working condition.
Sharp å±å± noise can be caused by improper smoothness; improper bearing clearances can constitute metal sounds. The dents on the outer ring of the bearing can cause oscillations and form a smooth and loud sound. The knocking of the scar will also cause noise; this noise will be different from the bump of the bearing speed. If there is intermittent noise, it means that the rolling part can be damaged; this sound is the attack when the damaged surface is crushed and expired. If there are pollutants in the bearing, it often causes arpeggio. Severe bearing damage will cause irregular and grand noise.
Damage to the bearing can of course be detected by hearing; however, it is now generally the time when the bearing needs to be replaced immediately; so a better example is to use an electronic condition monitoring instrument; pre-diagnosing the working condition of the bearing.
Compared with the old method (use a wooden stick or screwdriver to the bearing housing; the other end is attached to the ear); using the leading instrument can more accurately predict the bearing situation.
2, contact with high temperature often indicates that the bearing is in an abnormal situation. High temperature is also harmful to the smoothing agent inside the bearing. Sometimes the bearing overheating can be attributed to the smoothing agent of the bearing; if the bearing works for a long time beyond the temperature of 125 Â° C (260H); The lifespan of the bearing is reduced; the reasons for the high temperature of the bearing are: smooth lack or over-fire, smooth impurities in the smoothing agent, excessive load, bearing damage, lack of clearance and high conflict of oil seal attack.
Therefore, it is necessary to continuously monitor the bearing temperature; whether it is to measure the bearing itself or other important parts. If it is in the same working conditions; any temperature changes can indicate that the problem has occurred.
The timing measurement of the bearing temperature can be relied on by the thermometer; the bearing temperature can be accurately measured.
Bearings of importance; meaning that when they are damaged; they will constitute a stop of the equipment; therefore, the best of such bearings should be equipped with a temperature detector.
Under normal conditions; the bearing will have a natural temperature rise just after smoothing or smoothing back and continue for one or two days.
3. Investigate the bearing if it is outstandingly smooth and can ensure proper insulation and moisture; it indicates that the oil seal should be free of wear. However, when the bearing housing is turned over, the bearing is visually inspected and the oil seal is regularly viewed. Seal the oil seals to ensure they are sufficient to avoid hot liquid or corrosive liquids or gases entering the bearing along the axis. The retaining ring and the labyrinth oil seal should be greased to ensure a lot of protection. If the oil seal has worn out, it should be replaced quickly.
The function of the oil seal is to prevent the impurities from entering the bearing; the other function is to stick the smoothing agent in the bearing housing. If there is oil leakage in the oil seal, you should immediately check whether the oil seal is worn or damaged or the oil plug is loose. The oil leakage can also cause the cause. The mixing of the bearing housing is loose or because of the excessive increase of the smoothing agent, the mixing and oil leakage appearance. Check the active smooth system to ensure that the oil or grease enters the bearing correctly; and ensure the correct increase; together; the smoothing agent is discolored Or blackening; if this appearance; generally indicates that the smoothing agent is metamorphosed or rich in impurities; it should be replaced immediately.

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