Aug 08

The number of gears on the decanter centrifuge is relatively large. If one of them has a problem, it will affect the use of the entire decanter centrifuge. According to the experience analysis of the decanter centrifuge manufacturer, several common faults in the decanter centrifuge gear can be Basically summarized as the following.

     Usually, the common faults of decanter centrifuge gears include tooth surface wear, tooth surface gluing and scratches, tooth surface contact fatigue, bending fatigue and broken teeth. The causes include manufacturing errors, poor assembly, poor lubrication, overload, and operating errors. Due to the characteristics of the structure and working principle of the gear, the vibration signal is very complicated, and the vibration fault diagnosis of it needs to be analyzed in the time domain and frequency domain at the same time. Regardless of whether the gear is in a normal or abnormal state, the change frequency of the gear meshing stiffness always exists. Therefore, the gearbox should be diagnosed according to the gear meshing frequency component. Because the gear signal is more complex, the fault has a lot of influence on the vibration signal, especially due to the effect of amplitude modulation and frequency modulation, there are many sideband structures in the gear vibration spectrum, which requires specific analysis of it during analysis and diagnosis. The components of the gearbox can accurately diagnose the fault of the gearbox.

The fault characteristic frequency of the decanter centrifuge gear is as follows:

1. The normal frequency spectrum shows the 1X and meshing frequencies of all rotating shafts. There are speed sidebands on both sides of the gear meshing frequency, and the peak value is small.

2, gear wear. The natural frequency of the gear appears, and there is a sideband of the rotational speed of the shaft where the worn gear is located. When the wear is obvious, a sideband with a higher peak will appear near the meshing frequency.

3. The centrifuge gear is eccentric. There are sidebands with higher amplitude near the meshing frequency, indicating that the gear is eccentric or the shaft is not parallel, and the peak meshing frequency increases with the increase of the load.

4. Misalignment of centrifuge gears. Almost always arouse the vibration of the second or higher harmonics of the meshing frequency, and the peak of the 2X or 3X meshing frequency spectrum is larger, and there are side frequencies separated by the speed frequency.

written by Decanter Centrifuge


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