“When the equipment is regularly inspected, inspected, and replaced, it is judged whether the removed bearing can be used again. It is necessary to carefully investigate and record the appearance of the bearing. In order to clarify and investigate the remaining amount of lubricant, after sampling, Better cleaning the bearings." Check the condition of the raceway surface, the rolling surface and the mating surface, and the wear state of the cage for damage and abnormalities.
In addition, consider the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc., and then determine whether the bearing can be reused or replaced. If the bearing is found to be damaged or abnormal, find out the cause and develop countermeasures. If there are several defects, the bearing can no longer be used and a new bearing needs to be replaced.
1) Any one of the inner and outer rings, the rolling elements, and the cage has cracks and fragments.
2) Any one of the inner and outer rings and the rolling elements are peeled off.
3) There are significant jams on the raceway surface, ribs and rolling elements.
4) The wear of the cage is severe or the rivet is loose.
5) The raceway surface, rolling elements are rusted and flawed.
6) There are significant indentations and marks on the rolling surface and the rolling elements.
7) There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
8) The heat is discolored.
9) The seal ring and dust cover of the grease seal bearing are severely damaged.
The inspection items in operation include the rolling sound, vibration, temperature, and lubrication status of the bearing. The details are as follows:
First, the rolling sound of the bearing
The sounder is used to check the size and sound quality of the rolling sound of the running bearing. Even if the bearing is slightly peeled off, abnormal sounds and irregular sounds are emitted, which can be distinguished by the sounder.
Second, the vibration of the bearing
Bearing vibration is very sensitive to bearing damage. For example, peeling, indentation, rust, crack, wear, etc. are reflected in the bearing vibration measurement. Therefore, vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.). The size, by frequency, infers the specifics of the anomaly. The measured values vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
Third, the temperature of the bearing
Usually the temperature of the bearing rises slowly as the operation begins, and reaches a steady state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions. The thermal sensor can be used to monitor the working temperature of the bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the burning shaft accident.
