Material Level Measurement in Ball Mill Based on the Analysis of Sound Signals

The measurement of material level in ball mill is a difficult problem for enterprise production. The ball mill should keep appropriate amount of material to achieve high energy efficiency and work efficiency. In order to effectively measure the material level in the mill, we collect the sound signals when the mill is working (mill sound for short). Characteristic frequency band of mill sound is selected by analyzing collected data. Wavelet analysis technique is used to obtain the signal power of characteristic frequency band which reflects material level. The experiment result shows that the proposed scheme can accurately detect the material level of the mill so as to make it work in best load condition.