Patent ID: 9289771
Filing Date: 2016-03-22
CPC Classification: B02C

Claim Text:
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 ).