In General for transition fit bearings and shaft, washer and bearing bore fit is generally a clearance fit shaft in double direction bearings should be fixed on the shaft, to prevent scroll relative to the axis. If installed backwards, bearing not only is not working properly, and all the mating surfaces are subjected to severe wear. Tank shell holes more deeply, it can also be used to lengthen the micrometer head overhaul. Bearing installation methods axis is the case under most normal circumstances, walls to win combined with inner ring and shaft, combined with clearance fit of the bearing and bearing housing.
Large machinery cannot be rotated manually, so no load starting immediately after cutting off power, machinery idle, check for vibrations, noise, contact rotating parts, and so on, after confirmed without exception, into the power running.
Power operation, starting from no-load speed, slowly raised to the conditions set forth in the rated operation. Things to check for in the commissioning, any unusual changes in sound, bearing temperatures, lubricant leakage or discoloration, and so on. If exceptions are found, should immediately suspend the operation, check the mechanical and, if necessary, to remove the bearings check.
Bearing temperature, generally according to the external temperature housings speculated. But the temperature measurement of bearing outer ring with holes directly is more accurate. Bearing temperature, from a running start rising, typically temperature-stable after 1-2 hours. Poor if the bearings are mounted, the temperature rises dramatically, unusual high temperatures. The reason such as excessive lubricant, bearing clearance is too small, poor installation, sealing device too much friction. High speed rotation, bearing structure, lubrication of choice is also the cause of the error.
Ordinary bearing outside of room temperature can be speculations, the bearing temperature. If the oil hole can directly measure the bearing outer ring temperature, is more appropriate. Fro, bearing temperature running start gradually rising, 1-2 hours to the same form. Normal temperature of the bearings from mechanical heat capacity, heat dissipation, speed and load differences. If smooth, install appropriate, bearing temperature quick rise, rendering abnormal high temperature when required to suspend operation, bearings, accepted the need for precautions. Because the temperature from the effect of smoothing, speed, load, and only disclose the approximate temperature of the performance limits in the table. Using heat sensors can monitor the task of bearing temperature at any time, and complete the temperature across the active alarm when households, or abort the rule value to avoid burning shaft shock
In addition, between the bearing ring and the housing bore should have a 0.2-0.5mm gap to compensate parts, installation errors caused by inaccurate, when running in the bearing ring Central offset, this gap ensures that automatically adjust, avoid touching the friction so that its normal functioning. Bearing installation when accurate, seat it can automatically adapt to move the body to move, make sure your move is up and down ring road. When mounting bearings, maintenance shaft and verticality of the axis of the center line. Otherwise, the bearing caused by severe injuries. Way is to dial fixed on the tank shell surface, touch the top of the table top rolling bearings the bearing ring raceway, observe the indicator pointer, pointer to swing about shaft and shaft center line is not vertical.

 


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