| 摘要 |
Comminuting apparatus includes a grinding drum, means for rotating the drum, grinding teeth mounted within the drum and a stationary grinding device extending into the drum and having complementary grinding surfaces coactive with the teeth. The drum is in the form of a rotor having a perforated peripheral wall through which comminuted material is centrifugally displaced into a chamber about the same, with impeller means on the rotor about the periphery thereof for creating a suction of air outwardly from within the rotor in the comminuting rotation of the rotor. Means are provided for automatically stopping the rotor when a foreign metal particle lodges across a gap between conductive surfaces connected to the rotor and the housing.
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