1. Vibration of the bearing Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, rust, cracks, wear, etc. will be reflected in the bearing vibration measurement, so the vibration can be measured by using a special bearing vibration measuring device (frequency analyzer, etc.) The size of the abnormality cannot be inferred from the frequency. The measured value differs depending on the service conditions of the bearing or the installation position of the sensor, etc., so it is necessary to analyze and compare the measured value of each machine in advance to determine the judgment standard. 2. Bearing temperature The temperature of the bearing can generally be inferred from the temperature outside the bearing chamber. If the temperature of the outer ring of the bearing can be directly measured through the oil hole, it is more appropriate. Usually, the temperature of the bearing starts to rise slowly with the operation of the bearing, 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 lubricating and mounting parts are suitable, the bearing temperature will rise sharply and abnormally high temperature will appear. At this time, the operation must be stopped and necessary preventive measures must be taken. The thermal sensor can be used to monitor the working temperature of the bearing at any time, and realize automatic alarm or stop when the temperature exceeds the specified value to prevent the occurrence of shaft combustion accidents. High temperature often indicates that the bearing is in abnormal condition. High temperatures are also detrimental to bearing lubricants. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the bearing is continuously rotated at a temperature exceeding 125°C for a long time, the life of the bearing will be reduced. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricant. It contains impurities, the load is too large, the bearing ring is damaged, the clearance is insufficient, and the high friction caused by the 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 are constant, any temperature change may indicate that a malfunction has occurred. The regular measurement of the bearing temperature can be done with the aid of a thermometer, such as the skf digital thermometer, which can accurately measure the bearing temperature and display it in ℃ or Fahrenheit. The important bearing means that when it is damaged, it will cause the shutdown of the equipment, so it is best to install a temperature detector on this type of bearing. Under normal circumstances, the bearing will have a natural temperature rise after lubrication or relubrication and last for one or two days.  

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