Bearing Maintenance
Bearing Maintenance
2022年3月16日
Lubrication Methods, Advantages and Disadvantages of Rolling Bearings
Lubrication Methods, Advantages and Disadvantages of Rolling Bearings
2022年3月17日

Vibration and Temperature Inspection of Bearing

1. Vibration of bearing:Vibration and Temperature Inspection of Bearing

Bearing vibration is very sensitive to bearing damage, such as peeling, indentation, corrosion, crack, wear, etc., which will be reflected in the bearing vibration measurement deepen and turn black.. 

Therefore, the vibration can be measured by using a special bearing vibration meter (frequency analyzer, etc.), and the specific situation of abnormality can not be inferred by 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.Vibration and Temperature Inspection of Bearing

2. Temperature of bearing:Vibration and Temperature Inspection of Bearing

The temperature of the bearing can generally be inferred from the temperature outside the bearing chamber. It is more appropriate if the oil hole can be used to directly measure the temperature of the outer ring of the bearing.

Usually, 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.Vibration and Temperature Inspection of Bearing

High temperature often indicates that the bearing is in an abnormal condition. High temperature is also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant  temperature exceeds  of the bearing. If the temperature of the bearing exceeds 125 ℃ for a long time, the service life of the bearing will 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 bearing temperature can be measured regularly with the help of thermometer, such as SKF digital thermometer, which can accurately measure the bearing temperature and display it in ℃ 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.these substances increases with the extension of working time.

Vibration and Temperature Inspection of Bearing

In order to keep the above material factors affecting bearing life in a good state, it is first necessary to control the original structure of the steel before quenching.Vibration and Temperature Inspection of Bearing

The technical measures that can be taken are:the insoluble carbides austenitizing at high temperature (1050 ℃), rapid cooling to 630 ℃ isothermal normalizing to obtain pseudo eutectoid fine pearlite structure, or cooling to 420 ℃ isothermal treatment to obtain bainite structure. It can also be rapidly annealed by forging and rolling waste heat to obtain fine-grained pearlite structure, so as to ensure the fine and uniform distribution of carbides in the steel. When the original structure in this state is austenitized by quenching and heating, in addition to the carbides dissolved in austenite, the insoluble carbides will aggregate into fine particles.