Dependence Between the Percussion Centre and the Uniformity …
355
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.04
0.02
0
0.02
0.04
Temp (s)
Amplitude
Fig. 2 Signal in the time domain. Well-balanced rotor
50
100
150
200
250
300
350
400
450
500
0
0.001
0.002
0.003
0.004
0.005
Amplitude
Frequency (Hz)
Fig. 3 Frequency spectrum. Well-balanced rotor
In the case of the hammers mill, it is unavoidable the rapid wear of the hammers,
case appearing difficult problems of balance.
If the rotor, from the dynamic point of view, is considered balanced, because of the
percussion interactions between hammer and material, the rotor becomes unbalanced
(it does not respect the percussive centre).
355
0
0.005
0.01
0.015
0.02
0.025
0.03
0.035
0.04
0.04
0.02
0
0.02
0.04
Temp (s)
Amplitude
Fig. 2 Signal in the time domain. Well-balanced rotor
50
100
150
200
250
300
350
400
450
500
0
0.001
0.002
0.003
0.004
0.005
Amplitude
Frequency (Hz)
Fig. 3 Frequency spectrum. Well-balanced rotor
In the case of the hammers mill, it is unavoidable the rapid wear of the hammers,
case appearing difficult problems of balance.
If the rotor, from the dynamic point of view, is considered balanced, because of the
percussion interactions between hammer and material, the rotor becomes unbalanced
(it does not respect the percussive centre).