Machine check operation status and prepare a thorough inspection program has become more and more serious. The bearing the focus of attention, because it isthe most important of all the rotating parts in a machine. Condition monitoring is an important part of preventive maintenance. Early detection of bearing failure in order to avoid the bearing damage caused by non planned maintenanceequipment downtime. However, not all and are equipped with the advancedinstruments. In this case, the machine operator or maintenance engineers havebearing on the "fault" remain vigilant, such as noise, vibration and temperature."Listen", "touch" and "observation" are 3 important factors. The following views can be provided for your reference.
A, touch
High temperature often bearings in unusual circumstances. High temperatures may also be harmful to the bearing lubricant. Sometimes overheated bearings can be attributed to the bearing lubricant, if bearing long-term operation at temperatures over 125 degrees Celsius, will reduce bearing life, the cause of high temperature bearings include: insufficient or excessive lubrication lubrication, lubricant contains impurities, heavy load, bearing damage, lack of space, and oil have high temperature friction etc.. Therefore continuity bearing temperature monitoring is necessary, both the measurement of the bearing itself or other important parts of the. If the condition in operation conditions, any temperature changes are likely to express the failure has occurred.
Regular measurement of bearing temperature can be assisted by a thermometer,can accurately measure the bearing temperature and in accordance with thedegrees Celsius display. The importance of the bearing, meaning when it is damaged, will cause the equipment downtime, so this type of bearing is bestequipped with temperature detector. Under normal circumstances, bearinglubrication and lubrication in or after a natural rise in temperature and for a day or two.
Two, observation
Bearing lubrication and the right of the barrier debris and moisture, oil seal should not wear, however, it is best to open the bearing box, by visual inspection ofbearing and regularly check the oil seal, check near the bearing oil seal status to ensure that they are adequate to prevent hot liquid or corrosive liquid or gasinfiltration along the axis of the bearing. Protection ring and a labyrinth seal should be coated with grease to ensure maximum protective effect. Oil seal ruoyi wear should be replaced as soon as possible. Seal the functions in addition to preventing the magazine into the bearing, another function is the lubricant in the bearing box. If there is leakage of oil seal oil seal should immediately checkwhether have wear failure or oil plug loose. Oil leakage phenomenon also can be caused by the bearing box joint loosening or because the lubricant to the formation of excessive mixing and leakage phenomenon, check the automatic lubrication system to ensure that the correct amount of added, at the same time examinelubricant is discolored or black, if there is such a phenomenon, usually the lubricant contains magazine.
Three, listen
Use hearing to identify irregular running is a very common method. For example, by means of electronic stethoscope to check whether a part of abnormal noise is composed of experienced operator to use method. If the functioning of bearings in good condition will make a low humming sound. If a sharp hissing sound, squeaky voice and other irregular sound, usually bearing in undesirable operating condition.A sharp creak noise may be due to inadequate lubrication. Bearing clearanceinappropriate may cause a metallic sound. Bearing outer track of the dent willcause vibration, resulting in smooth crisp sound. If due to the installation of thepercussion scars will produce noise, this noise will increase with the bearing speed vary. If intermittent noise, said rolling element may be damaged. This sound iswhen the damage occurred in the surface of rolling bearing date, if contaminants often causes hissing. Serious damage to the bearing will produce irregular and loud noise.
Bearing damage is by listening to perceptible, but often this time already arrivedbearing must be replaced immediately not. So, better methods such as the use of such as electronic monitoring instruments, pre operation diagnosis of bearing.
Compared with the old method (using a stick or screwdriver against the bearing box, the other end to his ear), the use of advanced equipment to accurately estimate the bearing condition.
Four, grease lubrication
And lubrication of bearings is best stop during the implementation of the plan of equipment, and regular supplement. At the same time the old grease removed or through the oil drain plug the old grease agent. Prior to joining the new oil to clean the nozzle. If the bearing box without feeding nozzle device, you should open the housing lid or cover to remove the old grease, and then add the same freshgrease.
Five, oil lubrication
Examine the bearing level, should ensure that the vent oil type used properly and the oil level is whether there is obstruction.
Remove a small amount of oil as the sample and the fresh oil comparison. If the sample looks like cloud, it may be mixed with water to results, should be replaced. If the sample is darker colors or thick, so may indicate that the oil began tocarbonization. The old engine oil should be replaced, if possible, use fresh oil to flush the bearing. At the same time replacing the oil should be replaced to ensure the oil type must be the same, and added to the level required.
There is a more reliable method to determine oil, is the analysis of samples, if the oil pollution should replace the seal or consider filter.
Lubrication system oil bath type, if the operating temperature is not high.
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