2013年8月14日星期三

The method of thermal loading



Large vibrating screen bearings, press-fitting takes a lot of force, it is difficult to push. Thus, the bearing will be heated in an oil, so that the expansion, and the thermal loading on the shaft is widely used method. Using this method, can be increased without undue force to the bearing, in a short time operation.
Second, the installation of tapered bore clutch bearing
  Tapered bore bearings are fixed directly to the inner tapered shaft, or use an adapter sleeve, remove the sleeve mounted to the cylinder axis. Aligning bearing shaker large multi-purpose hydraulic installation.
3, running checks
Vibrating screen bearings after installation, in order to check for proper installation, operation to be checked, small machinery can be rotated by hand to confirm whether rotate smoothly. Check the project due to foreign bodies, scars, indentations caused by dysfunctional due to poor installation, poor mount processing uneven rotational torque generated by the clearance is too small, the installation errors caused by seal friction torque, etc. .
Due to large machinery can not be manually rotated so no load power off immediately after startup for coasting to check for vibration, sound, whether there is contact with rotating parts, etc., confirming that no abnormalities after entering the power running.
Power running, never load low speed and slowly increase to the conditions set rated operation. Commissioning checks matters as whether there is abnormal sound, bearing temperature shift, lubricant leakage and discoloration fishing and so on.
Check the bearing temperature shaker general appearance from the housing speculation seen. But the use of the hole, the direct measurement of the bearing outer ring temperature, more accurate. Start of operation of the bearing temperature rises gradually, without exception, typically 1 to 2 hours after stabilization. If the installation due to bad bearings or bearing temperature will rise sharply. The case of high-speed rotation, the bearing lubrication method of choice is the cause of the error.

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