The device comprises a vertical cylindrical milling chamber (7), inside which is located a limiter (11) of its working volume, shaped as a body of revolution of charging cross-section, provided with vertical ribs (12) oriented tangentially to its generatrix. The lower base of a hopper (6) connecting the milling chamber (7) to a feed bin (2) is located in the immediate vicinity of the upper edges of the ribs (12) of the limiter (11)
