Study on the Method for Collecting Vibration Signals from Mill Shell Based on Measuring the Fill Level of Ball Mill

Table 2

Vibration frequency of mill shell caused by impact of each layer balls.

The serial number of balls layer	Frequency at first mode of vibration (Hz)	Frequency at 15th mode of vibration (Hz)	Scope of vibration frequency of mill shell (Hz)
1	460	6900	460~6900
2	474	7110	474~7110
3	488	7320	488~7320
4	504	7560	504~7560