2013年7月10日星期三

Quality check bearing operation tips

Bearings should be checked after installation, you should ensure that the bearing in place, rotating flexible cable wiring, improper installation, such as bearings, bearing temperature will rise quickly and damage, and even death card bearing fracture or other serious accidents.
First, the rotation of the bearing sounds with a stethoscope and other tests, there is a strong metal noise, abnormal sound, irregular sound, etc. Exceptions. The reasons are poor lubrication, shaft or bearing bad precision, bearing damage, foreign invasion and so on.
Secondly, bearing temperature, and can be based on speculation bearing the external temperature. But the use of direct measurement of the bearing outer ring hole temperature is more accurate. Bearing temperature gradually increased from the start of operation, typically 1 to 2 hours after the temperature to stabilize. If the bearing bad installation, the temperature will soar, abnormal high temperature. The reason such as too much lubricant, bearing clearance is too small, poor installation, seal friction and too big. The case of high-speed rotation, the bearing structure, the choice of lubrication is the cause of the error.
Third, small machinery can be rotated by hand to verify rotate smoothly. Check the project due to nick, indentation caused by dysfunctional, because poor installation, mount the torque generated by poor processing unstable, because clearance is too small, the installation error, seal friction torque caused by too large and so on. Without exception, you can begin powering.
Fourth, the large machinery can not be manually rotated so cut off the power immediately after starting load, machine idle to check for vibration, noise, etc. in contact with the rotating member is to confirm no abnormality, into the power running.

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