Mill for producing uniform grain sizes

摘要

A double screen cone mill includes a cylindrical screen (18) and a conical screen (23) attached to an upper casing (3). A rotary blade 12 is arranged within an annular space (15) having a nearly V-shaped section between the cylindrical screen (18) and the conical screen (23) so as to rotate keeping a desired gap relative to the respective screen surfaces. Since the annular space (15) having the nearly V-shaped section is circumferentially spaced from the shaft (11), the rotary blade (12) rotates at a high circumferential speed even in the bottom portion of the annular space (15).