Study on a New Vibration Method for Measuring the Fill Level of the Ball Mill

The vibration signals of the ball mill shell and the bearing housings with different coal feeder cases were collected in experiment. The original vibration signals were filtered by the designed filter based on the relation between the mill vibration and the fill level. At the same time, the vibration signals of the mill shell were compared with the vibration signals of the bearing housing according to reflecting the sensitivity of the fill level change. And the result of this comparison reveals that the vibration signals of the mill shell present a higher sensitivity to the changes on the fill level, which provides a reliable basis for the accurate measurement of the fill level.