NTN thrust ball bearing vibration and temperature of the bearing damage - bearing knowledge

by:Waxing     2020-05-26
A, the vibration NTN bearing thrust ball bearing vibration is sensitive to bearing damage, such as peeling, indentation, rust, crack and wear will be reflected in the bearing vibration measurement, therefore, through the use of special bearing vibration tester ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation. Measured values for NTN thrust ball bearing and sensor installation position and different using conditions, thus requiring prior to each machine is analyzed by the measured value of the determined after judgment standard. Second, NTN bearing temperature, the temperature of thrust ball bearing, generally have a bearing on the surface of the outdoor temperature can be predicted, if using the oil hole can directly measure temperature, NTN thrust ball bearing outer ring is more appropriate. Usually, NTN thrust ball bearing temperature as bearing operation began to rise slowly, 1 - After 2 hours to reach steady state. NTN thrust ball bearing normal temperature due to the heat capacity of the machine, heat dissipating capacity, rotational speed and load. If the appropriate lubrication, installation department, the bearing temperature will rise sharply, appear unusually high temperature, must stop at this moment, take the necessary precautions. Using thermal device can monitor temperature of NTN thrust ball bearing, and implement e. automatic alarm when the temperature exceeds or stop to prevent the shaft accidents. In high temperature often is in abnormal situation. High temperature is also harmful to NTN thrust ball bearing lubricant. Sometimes overheated bearings can be classified to the bearing lubricant. If the bearing temperature for a long time even the transfer of more than 125 ℃ lower bearing life. The causes of high temperature bearing include: lubrication inadequate or excessive lubrication, the lubricant. Contains impurities, heavy load, NTN thrust ball bearing damage of ring, clearance, high friction and oil seal and so on. So the continuity of NTN thrust ball bearing temperature monitoring is necessary, whether measured bearing itself or other important parts. If it is on the basis of the operating conditions, the temperature change of any fault has occurred. NTN thrust ball bearing temperature measurement can be regularly with the aid of thermometer, digital thermometer, for example, can accurate bearing temperature measurement and display by ℃ or Fahrenheit units. The importance of NTN thrust ball bearing, means that when the damage cause of equipment downtime, so this type of bearings shall be equipped with best temperature probe. Under normal circumstances, NTN thrust ball bearing in the lubrication or lubrication after there will be a natural temperature rise and the last one to two days.
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