Vibration and temperature of bearing

1. Vibration of bearing

Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, corrosion, crack, wear, etc., which will be reflected in bearing vibration measurement. Therefore, the vibration can be measured by using special bearing vibration measuring instrument (frequency analyzer, etc.), and the specific abnormal situation can not be inferred through frequency division. The measured values are different due to the service 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 standard.

2. Bearing temperature

The bearing temperature can be inferred from the temperature outside the bearing chamber. If the oil hole can be used to directly measure the temperature of the bearing outer ring, the bit is more appropriate.

Generally, the temperature of the bearing starts to rise slowly with the operation of the bearing and reaches a stable 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 appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.

The thermal sensor can 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 occurrence of combustion shaft accident.

High temperature often indicates that the bearing is in an abnormal condition. High temperatures are also harmful to bearing lubricants. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing can be reduced. The causes of high temperature bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.

Therefore, it is necessary to continuously monitor the bearing temperature, whether it is measuring the bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.

The periodic measurement of bearing temperature can be carried out with the help of thermometer, such as SKF digital thermometer, which can accurately measure the bearing temperature and display it in units of ℃ or Fahrenheit.

Important bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind of bearing should be equipped with temperature detector.

Under normal circumstances, the bearing will have a natural temperature rise after just lubrication or re lubrication and last for one or two days.