IMPACT MILL FOR GRINDING LOOSE MATERIAL

The impact mill (1) for grinding loose material, comprises: a first body (2) defining a grinding chamber (3) inside which is housed at least one main rotor (4) moveable in rotation around a first axis (X); a second body (10) defining an inlet chamber (11) of the material to be ground communicating with the grinding chamber (3) and inside which is housed at least one secondary rotor (12) moveable in rotation around a second axis (Y), the secondary rotor (12) being adapted to send the material to be ground inside the grinding chamber (3); the inlet chamber (11) and the grinding chamber (3) being delimited by at least two side walls (5, 13) arranged substantially transversely to the first and second axis (X, Y) respectively, and by at least one connecting wall (6, 14) interposed between the respective side walls (5, 13) to surround at least partly the relevant rotor (4, 12), the first and second axis (X, Y) being arranged substantially horizontal and parallel to each other; wherein the inlet chamber (11) is arranged laterally to the grinding chamber (3) and they communicate to each other by means of a connecting opening (16) defined on the respective connecting walls (6, 14),the connecting opening (16) being arranged at the lower portion of the inlet chamber, so that the material sent from the secondary rotor (12) is directed from the bottom of the inlet chamber towards the grinding chamber (3) and the connecting wall (14) of the inlet chamber (11) having at least one adjustable portion (14a) moveable in rotation, during use, around an axis of adjustment (Z) to vary the inlet direction of the material to be ground inside the grinding chamber (3).