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Matters needing attention in working bearings
Source: China Bearing Network Time: 2014-03-23
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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.
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.
Observe the bearing if it is outstandingly smooth and correct to isolate debris 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.
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.
The smoothest smoothness of the grease smooth bearing is the time of the equipment in the program; and the time to make up. Clear the old grease together or the old grease through the drain plug. Once the new oil has been used, the nozzle should be cleaned. If the bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease; then make up the same fresh grease.
When the oil is smooth to check the oil level of the bearing; it should be ensured that the oil type used is 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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