| 主权项 |
1. An impact mill comprising a frame (1′) defining a milling chamber (1) containing a rotor (2) provided with hammers (4) uniformly arranged on its periphery, and at least one impact screen (5, 6) which, by way of its top end, is mounted pivotably on an articulation (7, 8) connected to the frame (1′) of the mill, so as to be able to pivot with the aid of a respective adjusting jack (9, 10) in order to move the bottom end of the impact screen (5, 6) toward or away from the rotor (2) so as to define, between the bottom end of the impact screen and the free end of one of the hammers (4), a spacing (R) which determines a given particle size, the mill additionally comprising a device for positioning the rotor (2) that comprises indexing means (21, 22) for positioning the end of one of the hammers in a position in which it is as close as possible to the impact screen (5) for the purpose of adjusting said spacing, wherein said positioning device comprises a geared motor (11) driving a pinion (12) capable of engaging with a toothed wheel (13) arranged at one of the ends of the shaft (3) of the rotor (2) and fixed in rotation to the latter in order to rotate the rotor from a rest state to said position in which one of the hammers (4) is as close as possible to said impact screen (5). |
