Grinding mill

DETAILED DESCRIPTION The mill comprises a frame including an upright support member 6 and a horizontal plate member 10 which together are interconnected and support an external rotary cone 1 having helical internal ribs 1a, and an internal cone 2 also having helical ribs 2a.
The ribs 1a extend in the reverse direction to the ribs 2a.
The ribs 1a, for example, may form a right-hand screw/thread whereas the ribs 2a form a left-hand screw/thread.
The cone 2 is maintained in a non-rotatable position on toothed support 5 so that during rotation of the cone 1 a sheering effect is produced and a substance passing downwardly between the two cones is ground increasingly finer as the walls of the two cones converge.
The toothed support 5 does not rotate and neither does the cone 2 but by means of the support 5 and the shaft 9 the cone 2 is adjustable to different positions relative to the cone 1 as discussed in more detail hereinafter.
The external cone 1 rotates on an abutment 3 by means of toothed wheel or gear 4 which mates with a toothed portion of the abutment.
The cone 1 is suitably supported by bearing means from the frame.
A suitable motor with reduction gearing may couple to toothed wheel 4 for driving the cone 1.
The upper portion of the cone 1 has a feed inlet 7 which rotates with the cone 1.
Screw elements 18 (see FIG.
1) are fastened to the internal walls of the inlet 7.
These elements are disposed about a portion of the circumference of the inlet 7, as indicated in FIG.
1, and these elements have a helical configuration similar to the ribs 1a of cone 1.
Because the inlet 7 rotates with the cone 1, the elements 18 also are rotatable therewith.
Screw elements 8 are carried by a shaft 13 which extends coaxially of the internal cone 2 and includes means for fastening the cone 2 and shaft 13 in fixed relationship.
The elements 8 have a helical shape which corresponds to that of the ribs 2a on the internal cone.
The shaft 13 may be freely guided from above or may be constrainedly guided by the use of a frame (not shown) connected to the general fixed frame