After the end of the bearing installation, in order to check the installation is correct, the operation checks. Small mechanical rotate by hand, to determine whether the rotation is smooth. Inspection items nick, indentation caused by dysfunctional torque instability, arising due to poor installation, mount processing bad due to the clearance is too small, installation errors, and seal friction torque and so on. If there is no exception, you can start the power operation.
Large machinery can not be manually rotated so cut off the power immediately after the no-load start, idle machinery, check for vibration, noise, rotating parts in contact to confirm that no abnormality, the power operation.
Power operation, start from no-load low-speed, slowly increased to the conditions stipulated in the rated operation. Test run to check the matters, whether there is abnormal sound, bearing temperature changes, lubricant leakage or discoloration. If abnormal, should be immediately discontinued operation, check the mechanical, if necessary, to remove the bearing check.
Bearing temperature, and can be speculated that the external temperature of the bearing. However, the use of hole directly measuring the temperature of the bearing outer ring is more accurate. Bearing temperature gradually increased from the operation, usually 1 to 2 hours after temperature stabilization. If the bearing is bad installation, the temperature will soar, and abnormal high temperature. The reason lubricant such as excessive bearing clearance is too small, poor installation, and sealing devices friction is too large. Occasions of high-speed rotation, the bearing structure, the lubrication mode select error is also the reason.
Bearings turn the sound check with a stethoscope and other strong metal noise, abnormal sound, irregular, the sound of exception. The reason is poor lubrication, poor shaft or bearing accuracy, bearing damage, dust and debris.
Bearing the following common faults:
1, tile surface corrosion: the spectra showed abnormal concentration of non-ferrous metal elements; many non-ferrous metal composition of submicron wear particles in the iron spectrum; excessive lubricant moisture, acid value exceeded.
2, the journal surface strain: iron cutting abrasive or black oxide particles in the iron spectrum, the metal surface tempering color.
3, the journal of surface corrosion: the spectra showed abnormal iron concentration and iron content in the sub-micron particles in the iron spectrum, excessive lubricating water or acid value exceeded.
4, the surface strain: cutting abrasive, abrasive ingredients for non-ferrous metals.
5, tile back fretting wear: spectra showed abnormal concentration of iron, the iron spectrum many iron content in the sub-micron wear particles, oil water and acid value exception.
Conditions of liquid lubrication, sliding surface lubricant to separate without the risk of direct contact, but also can greatly reduce the friction loss and surface wear; the film also has certain vibration absorption ability