After the bearing is installed, in order to check wheth […]
After the bearing is installed, in order to check whether the installation is correct, check the operation. Small machinery can be rotated by hand to confirm whether the rotation is smooth. Check the project due to foreign body, scars, indentation caused by poor operation, due to poor installation, the mounting base processing instability caused by the instability of the torque, due to clearance is too small, installation error, sealing friction caused by excessive torque Wait. If there is no abnormality you can start the power running.
Large-scale machinery can not be manually rotated, so no-load power immediately after cutting off the power, the machine idling, check for vibration, noise, rotating parts are in contact, etc., to confirm no abnormalities, into the power running.
Power running, from no-load low-speed start slowly raised to the rated conditions of the rated operation. Test run to check whether there is abnormal sound, bearing temperature changes, lubricant leakage or discoloration and so on. If abnormal, should immediately stop running, check the machine, if necessary, remove the bearing inspection.
Bearing temperature, generally based on the external temperature of the housing estimated. However, the use of direct measurement of oil hole bearing outer ring temperature more accurate. Bearing temperature, gradually increased from the start of operation, usually 1 to 2 hours after the temperature stability. If the bearing is not installed properly, the temperature will rise sharply, with abnormally high temperature. The reasons such as excessive lubricant, bearing clearance is too small, poor installation, sealing device friction is too large. High-speed rotation of the occasion, the bearing structure, the choice of lubrication error is also the reason.
Rotating sound of the bearing is checked with a stethoscope, etc., and there is a strong metal noise, abnormal sound, irregular sound, etc., indicating abnormalities. The reasons for poor lubrication, poor precision shaft or bearing, bearing damage, invasion of foreign bodies.