How to check the lubrication status of bearings during operation?

Inspection items during operation include rolling sound, vibration, temperature, lubrication status of the bearing, etc. The specific conditions are as follows:

1. The rolling sound of bearings

Use a sound detector to check the size and sound quality of the rolling sound of the running bearing. Even if the bearing is slightly damaged such as peeling, it will emit abnormal sounds and irregular sounds, which can be distinguished with a sound detector.

2. Vibration of bearings

Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, rust, cracks, wear, etc., which will be reflected in the bearing vibration measurement. Therefore, the size of the vibration can be measured by using a special bearing vibration measuring instrument. The specific circumstances of the anomaly cannot be inferred. The measured values vary depending on the operating conditions of the bearing or the installation position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment criteria.

3. Bearing temperature

The temperature of the bearing can generally be estimated from the temperature outside the bearing chamber. It would be more appropriate if the oil hole can be used to directly measure the temperature of the bearing outer ring. Usually, the temperature of the bearing begins to rise slowly with operation and reaches a stable state after 1-2 hours. The normal temperature of bearings varies depending on the machine's heat capacity, heat dissipation, rotation speed and load.

If the lubrication and mounting parts are appropriate, the bearing temperature will rise sharply and abnormally high temperatures will occur. At this time, the operation must be stopped and necessary preventive measures must be taken. Thermal sensors can be used to monitor the operating temperature of the bearing at any time, and automatically alarm the user or stop when the temperature exceeds the specified value to prevent shaft burning accidents.