Through the failure and deterioration of imported bearings, performance state parameters to judge and predict the reliability and performance of bearings, the part of the abnormal situation, the cause and the degree of danger to identify and judge, decide to repair and improve the method of comprehensive technology. Therefore, bearing fault diagnosis technology is not pure fault detection (or monitoring) technology, also is not pure point inspection instrumentation. Correct, rapid and effective signal acquisition, data processing, manual or automatic identification and judgement. In order to determine the scientific repair cycle, should also be based on the mechanism of various types of failure, fatigue, wear life of the necessary tests and estimates. Judge the degree of bearing damage in use can be used to determine the degree of a hearing, two touch, three observation method.

1, listen: the use of hearing to identify irregularities in the operation of a very common method. Such as a screwdriver or electronic stethoscope to detect a streamlined non-normal noise is a certain experience of the operator and maintenance personnel often use. Bearing if it is a good running condition will send out low whine sound, such as SKF bearings issued by the sharp hissing sound, squeak and other irregular sound, it is possible that the imported bearings have been in a bad state of operation.

2, touch: high temperature often indicates that imported bearings have been in an abnormal situation, high temperature is also harmful to the lubricant in the bearing, but the bearing some times of high temperature caused by the lubricant in the imported bearings, if the bearing in the temperature of more than 120 ℃ long term operation will reduce the life of the bearing. Causes of high temperature bearings have insufficient lubricant or excessive lubrication, lubricant contains impurities, excessive load, bearing damage, clearance and oil seals produced by the friction. Under normal circumstances, the bearing in just lubricated or in the lubrication will have a natural temperature rise and will last for one to two days.

3、Observation: If the bearings are well lubricated and there is no debris and moisture into the bearings, indicating that the oil seals are not worn, if the original imported bearings after opening the box, the bearings should be visually inspected and regularly check the oil seals. Check the condition of the oil seals near the bearings to ensure that they are sufficient to prevent hot liquids, corrosive liquids and gases from penetrating into the bearings along the centre of the shaft, and replace the seals as soon as possible if they are damaged. Check the automatic lubrication system to ensure that the oil or grease enters the imported F bearings, and to ensure that the correct amount of additive at the same time to check whether the lubricant is discoloured or blackened, if there is such a situation usually indicates that the lubricant contains impurities, such a situation on the use of the bearings is also harmful!