Let us briefly introduce the rolling sound of the bearing. The size of the rolling sound and the sound quality should be checked by the sounder to check the rolling needle roller bearing in operation. The advanced tools will accurately determine the problem. Where, even if the bearing has slight peeling damage, it will emit abnormal sounds and irregular sounds, which can be distinguished by the sounder.
Then press the outer ring needle roller bearing vibration check to see if the bearing damage is very sensitive, whether the peeling, indentation, rust, crack, wear, etc. will be reflected in the bearing vibration measurement, so by using a special bearing vibration measuring device (Frequency analyzer, etc.) can measure the magnitude of the vibration, and the specific situation of the abnormality cannot be inferred by the frequency division. However, the value measured by each machine differs depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
1. Measurement of shaft vibration
The measurement of the axial vibration of the drawn cup needle roller bearing can be measured by contact. A Wujin contact surface is used to directly press the surface of the journal with a spring. The Wujin is rigidly coupled to an extended metal rod and passes through the bearing shell. The gold surface is closely attached to the surface of the rotor. Therefore, the vibration of the Wujin surface directly reflects the axial vibration, and the vibration of the extension rod rigidly connected with the Wujin surface reflects the axial vibration. The use of an eddy current sensor to measure the vibration of the metal extension rod avoids interference with the bearing vibration measurement due to the coil outlet current passing through the excitation current.
2, the treatment of the axial vibration of the rear bearing, in order to ensure the degree of shafting in the field, the bearing height of the drawn cup needle roller bearing or the exciter is often raised, so that the side contact phenomenon of the rear bearing is serious, thus causing the rear bearing The vibration is large. The rear bearing is preset to be inclined so that the bearing bush and the journal are in better contact, which not only ensures the contact of the bearing bush, but also conforms to the inclination of the shafting, and has received good results. At the same time, the spherical surface of the shaft must be well grounded, and the self-positioning function of the bearing bush can be well played. In addition, the tightening force of the bearing bush is properly adjusted, and the foot screw cannot be loosened. Thus, the problem of large axial vibration of the rear bearing is basically Can be handled properly.
3, the rotor disturbance power processing
When there is neither the error of axial vibration measurement nor the problem of large axial vibration caused by the contact of the rear axle, the axial vibration exceeds the standard after analysis and it is true, and when the vibration is the power frequency, it can pass the high speed in the field. Dynamic balance improves vibration, as long as the method is right, basically one balance can be successful, up to 2 times.