KMbalancer Pro Multifunctional Mechanical Status Vibration Analyzer For Yonghe Heavy Industry Technology Co., Ltd. To Provide Mill Vibration Detection Services

The main vibration faults of rotating machinery include unbalance, misalignment, friction and loosening, etc., but the induced factors are various. Today, we will introduce how to deal with abnormal vibration of coal mill.When adding, the amount of coal and air does not match, when the coal mill to a certain amount of coal, the air volume is too small, can not be taken away from the mill in time, with the continuous accumulation of coal, the pulverized coal accumulated by the mill more and more, resulting in the vibration of the mill.When the air volume is too large, the pulverized coal of the mill is less and less, and the final grinding roller has a large jumping amplitude, and the vibration is larger to a certain extent, which affects the normal production. What should be done about this situation?

The technicians of Yonghe Heavy Industry Technology Co., Ltd decided to seek the help of KM Company to help to carry out vibration detection services for the mill. After detection, the frequency and harmonic amplitude of the drive shaft of the reducer are not obvious, indicating that there is no dynamic balance and centering problem of the coupling. There are obvious periodic impact signals in the time domain diagram of the reducer, but due to the small amplitude and velocity VEL amplitude <4.5mm/s, the abnormal condition of the gear surface of the reducer is not obvious.The amplitude of gear meshing frequency appearing in the spectrum of each measuring point on the envelope diagram is relatively increased, indicating that the first and second gear of the reducer have wear. There is no obvious bearing defect frequency in the spectrum of each measuring point on the envelope diagram, indicating that the bearing of the reducer does not show spalling and other phenomena. However, according to the fact that 2GMF1 is much larger than 1GMF1, the gear shaft has a eccentricity, and the corresponding bearing may have certain wear. On the speed VEL spectrum, it can be seen that the frequency of the first-stage meshing frequency of 215hz and the first-stage meshing frequency of 52.5 and their harmonics appear, and there is no side frequency band with wide distribution on both sides of the meshing frequency, indicating that there are no cracks, broken teeth and other phenomena on the tooth surface of the reducer.

According to this detection phenomenon, our vibration analyst analyzed the reason: the coal mill bites the coal abnormally, especially during the initial period of operation and exit, less coal is fed into the mill disc, and the mill roller cannot evenly roll the coal on the mill disc, resulting in vibration of the mill body. When the loading force failure occurs in the normal operation of the coal grinding system, when the loading force pressure fluctuation is large, the output of the mill changes greatly, the thickness of the coal seam is too thin or too thick, and the fluctuation amplitude of the mill roller is too large, which will cause the vibration of the mill.

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