The installation of NTN import bearings and vibration detection method

( 1) In NTN import bearings prior to installation, use the appropriate measuring tools according to the provisions of the technical requirements on the design drawing check the shaft and hole and machining quality of parts ( Such as dimensional accuracy and shape accuracy and surface roughness, etc. ) 。 ( 2) Shaft and hole assembly there such as bruising, burr, rust stain on the surface or solid particles ( Such as abrasive dust, sand, clay) Such as existence, not only can make the bearing installation difficulties and make the installation position is not correct, and solid particles such as falling into NTN import bearings grinding effect, when imports NTN bearing rotating grinding or bruising bearing surface of the work, so must be carefully checked before the installation, if found to have the above defects, should be revised. For example using oil file to remove burrs, bump touch mark, rusty spot, with fine abrasive cloth lighting, and like a clean solid particles, dirt, etc. ( 3) Should be assembled with clean the surface of the gasoline, kerosene, toluene and xylene solution washing clean, with dry clean duster cloth, and then coated with a thin layer of lubricating oil, it can make the operation more convenient installation. ( 4) When installed in the open NTN import bearings encapsulation, put it into the liquids such as gasoline with handle gently gently turning, to ensure the cage, encapsulated oil on the surface of the rolling element and raceway thoroughly washed clean. ( 5) When cleaning a lot of NTN import bearings, with the first temperature is 90 ~ 100 ℃ heat oil pour hot to melt encapsulated oil, and there is no edge and does not use net exfoliation tools to dig all the old oil, then pour hot a few minutes, then rinse with kerosene oil, clean with gasoline last again. After washing clean, the bearing on film gloves should be worn in the workbench of dry clean cloth or paper. ( 6) Note with sealed NTN import bearings do not clean with this law, the seal of the internal cleaning should remain the same. 1, the vibration of the NTN import bearings NTN import bearings 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 NTN import bearings vibration tester ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation. Measured values of bearing or 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. 2, the temperature of the NTN import bearings NTN import bearings temperature, usually have a bearing on the surface of the outdoor temperature can be predicted, if using the oil hole can directly measure temperature of bearing outer ring, is more appropriate. Usually, NTN import bearings temperature with bearing operation began to slowly rise, 1 - After 2 hours to reach steady state. The normal temperature of bearing for machine heat capacity, 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 the working temperature of NTN import bearings, and realizes e. automatic alarm when the temperature exceeds or stop to prevent the shaft accidents. With high temperature often said bearing is in abnormal situation. High temperature is also bad for NTN bearing lubricants imports. 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 import NTN bearing life. The causes of high temperature bearing include: lubrication inadequate or excessive lubrication, the lubricant. Contains impurities, heavy load, NTN import bearings damage ring, clearance, high friction and oil seal and so on. So the continuity of bearing temperature monitoring is necessary, whether it is measuring NTN import bearings itself or other important parts. If it is on the basis of the operating conditions, the temperature change of any fault has occurred. Importance of NTN import bearings, 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 import bearings in just after the grease or lubricant will be a natural temperature rise and the last one or two days.