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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge> Five major issues need to be paid attention to in bearing work Five major issues need to be paid attention to in bearing work
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-planned protection time. However; not everything and its equipped with this leading instrument. In this case; machine operator or protection engineer It is necessary to be highly vigilant about the “missing signal†of the bearing; for example, noise, temperature and oscillation. “Listeningâ€, “contact†and “survey†are three important elements. The following views can be used as your reference. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
First, the 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 number of causes of high temperature bearings is rich: smooth lack or overheating; smoothing agent is rich in impurities; excessive load; bearing damage; lack of voids; and high temperature conflicts of oil seals, etc. It is necessary; whether it is measuring the bearing itself or other important parts. If it is not working conditions; any temperature changes can indicate that the problem has occurred.
The timing measurement of the bearing temperature can be based on the thermometer; the bearing temperature can be accurately measured and expressed in degrees Celsius. The importance of the bearing; meaning that when it is damaged; it will constitute the stop of the equipment; therefore, the most suitable type of such a bearing should be equipped with a temperature detector. Under normal conditions; the bearing will have a natural temperature rise after smoothing or smoothing and continue for one or two days.
Second, investigate the bearing if it is outstanding smooth and correct insulation and moisture; it indicates that the oil seal should not wear; but; the best when turning the bearing box; visually check the bearing and check the oil seal timing; see the proximity bearing The oil seal is used to ensure that they are sufficient to prevent hot liquid or corrosive liquid or gas from entering the bearing along the axis. The retaining ring and 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 In addition to avoiding the magazine entering the bearing; another 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 appearance of the oil leakage can also be caused by the bearing. The mixing surface of the box is loose or because of the excessive increase of the smoothing agent; the active smoothing system is checked to ensure the correct amount of increase; together, the smoothing agent can be discolored or blackened; if there is such an appearance; Smoothing agents are rich in magazines.
Third, listening to the use of hearing to identify irregular work is a very general approach. For example, using an electronic stethoscope to view the abnormal noise of a part is experienced by the operator. Bearings will be declared if they are in outstanding work conditions. Low humming sound. If a sharp voice is announced; voices and other irregular sounds; generally indicate that the bearing is in poor working condition. Sharp squeaky noise can be caused by improper smoothness. Inappropriate The bearing clearance 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 bearing speed. The bump is different. If there is intermittent noise, it means that the roll can be damaged. This sound is attacked when the damaged surface is overburdened; if there are pollutants in the bearing, it often causes squeaking. Severe bearing damage will occur. Unruly and loud noise.
Bearing damage can of course be detected by hearing; however, it is generally necessary to replace the bearing at the moment. Therefore, better methods such as the use of electronic condition monitoring equipment; pre-determined bearing work.
Compared to the old method (use a wooden stick or screwdriver to the bearing housing; the other end is attached to the ear); the use of leading instruments can more accurately estimate the bearing situation.
Fourth, the smoothness of smooth grease bearing is the best time to implement the equipment in the program; and make up for it regularly. Clear the old grease together or remove the old grease through the drain plug. Scrub clean. If the bearing box does not have a device for the grease nipple; then open the bearing box cover or end cap to remove the old grease; then make up the same fresh grease.
5. When the oil is smooth to check the oil level of the bearing; it should be ensured that the oil type used can be correct and the vent hole of the oil level device can be blocked.
Take a small amount of oil as a sample and compare it to fresh oil. If the sample looks cloudy, then it can be mixed with water; it should be replaced. If the sample is darkened or thick, it can indicate the beginning of the oil. Carbonization. All old oil should be replaced; if it is possible; use fresh oil to wash the bearings. The replacement of the oil should ensure that the oil type replaced is the same; and make up for the required oil level.
There is a more reliable way to resolve the oil condition; it is to analyze the sample; if the oil is contaminated, it should replace the oil seal or think about the filter.
Use oil bath type smooth system; if the operating temperature does not exceed 50-60 degrees Celsius; and the oil is not contaminated; then replace the oil once a year. If the operating temperature is 100 degrees Celsius; then replace the oil 4 times a year; if it is operation The temperature is 120 degrees Celsius; replace the oil every month; if the operating temperature is 130 degrees Celsius, replace the oil every week.
Proper device protection is an important factor in promoting the longest service life of bearings. It is necessary to pay attention to the cleanliness of bearings; the correctness of bearing selection and the selection of appropriate equipment and protection. Bearings need to avoid pollutants and moisture. Pollution; it is necessary to have the correct device and the smooth description of the bearing arrangement; the condition of the oil seal; the type of smoothing agent and the smooth cycle; so that the special protection plays an important role.
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Source: Bearing network time: 2014-09-21