First is according to the needle bearing imported rolling voice recognition and review. We are able to use measuring apparatus, the size of needle roller bearings imported rolling sound in operation and sound to stop check. Because of needle injury, such as import bearings even with slight detachment also emits an exception and irregular, and thus with the sound of the measuring device can stop, tell the play the role of early prevention.
Second needle imports bearing vibration to identify the inspection in the work
Needle imports bearing vibration is very sensitive to bearing damage. Such as peeling, indentation, rust, crack and wear will be in needle roller bearing imports reflected in vibration measurement, therefore, through the use of special needle roller imported bearing vibration zhangs ephah profiler (frequency, etc.) can measure the size of the vibration, through frequency points cannot deduce the abnormal condition in detail. Measured values due to the use of imported bearing conditions or sensor installation position and different, and thus needs prior to measurement value of each machine stop after certain discriminant analysis compare specifications.
Finally according to the temperature of the needle bearing import to check
Needle roller bearing imported temperature, average according to the needle imported bearings of the outdoor temperature can fathom out, if used oil hole can directly import bearing outer ring temperature measurement, are more appropriate.
In general, the temperature of the needle bearing import with running start gradually rise, 1 to 2 hours to reach a steady state. Normal temperature of the needle roller bearing import for machine heat capacity, heat dissipating capacity, rotational speed and load. If smooth, device is appropriate, imported bearing temperature will rise sharply, can present abnormal high temperature, then must stop and take the necessary precautions. On the basis of a large number of test data, table 4-1 lists the various kinds of machinery import bearing outer temperature uniform values at work, for your reference. Because the temperature is smooth, speed, load, the influence of the environment, temperature range of values in the table only said roughly. Using thermal device can monitor the imported bearing operating temperature, and completes the temperature value beyond rules automatic alarm or stop to avoid burning shaft accident attack.
