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Detailed analysis: "bearing in work" should pay attention to matters
Source: China Bearing Network Time: 2013-03-09
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Viewing the condition of the machine at work and preparing a complete view is now more and more serious. In the meantime, the bearing is the focus; because it is the most important rotating part of all machines. Condition monitoring is an important part of avoiding protection. Early detection of bearing damage to avoid equipment failure due to bearing damage caused by non-schema protection time. However; not everything and its equipped with this leading instrument. In this case; machine operator or protection engineer It is necessary to maintain a high degree of vigilance against the "missing signal" of the bearing; the following views can be used as your reference.
Contact with high temperature often indicates that the bearing is in an abnormal condition. High temperature is also harmful to the smoothing agent in 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 degrees Celsius; the bearing life will be reduced; The reason for the high temperature bearing is rich: smooth lack or overheating; smoothing agent is rich in impurities; excessive load; bearing damage; lack of clearance; and high temperature conflict of oil seal attack, etc. Therefore, continuous monitoring of bearing temperature is Necessary; whether measuring the bearing itself or other important parts. If the working conditions are not changed; any temperature changes can indicate that the problem has occurred.
Investigate the bearing to obtain outstanding smooth and correct insulation and moisture; it indicates that the oil seal should be free of wear; however; the best when opening the bearing housing; visually check the bearing and check the oil seal timing; check the oil seal near the bearing The situation is to ensure that they are sufficient to avoid hot liquid or corrosive liquid or gas entering the bearing along the axis. The retaining ring and the labyrinth oil seal should be greased to ensure maximum protection. If the oil seal is worn, it should be replaced quickly. The function of the oil seal is avoided. The magazine enters the bearing; another function is to keep the smoothing agent in the bearing housing. If the oil seal has an oil leakage, it should immediately check whether the oil seal is worn or damaged or the oil plug is loose. The appearance of the oil leakage can also be caused by the bearing box joint. Loose surface or the appearance of mixing and oil leakage due to excessive increase in smoothing agent; check the active smoothing system to ensure correct increase; together check whether the smoothing agent can change color or blacken; if there is such an appearance; generally indicate smoothing agent Rich in magazines.
Listening to the use of hearing to identify irregular work is a very general approach. For example, using an electronic stethoscope to view abnormal noise of a part is experienced by the operator. The bearing will be declared low if it is in outstanding work conditions. The sound of the humming sound. If a sharp voice is announced; the voice and other irregular sounds; generally indicate that the bearing is in poor working condition. The sharp noise can be caused by improper smoothness. Inappropriate bearing The gap can also constitute a metal sound. The dent on the outer ring of the bearing will cause oscillation; and it will form a smooth and loud sound. If the knocking damage caused by the device will also cause noise, this noise will follow the unevenness of the bearing speed. Not the same. If there is intermittent noise, it means that the rolling parts can be damaged. This sound is the attack when the damaged surface is overburdened; if there are pollutants in the bearing, it often causes squeaking. Severe bearing damage will not occur. Rules and grand noise.
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