METHOD OF CONTINUOUS GRINDING DRY SMALL MATERIALS, FOR EXAMPLE, GRAINS, BETWEEN TWO GRINDSTONES INTO POWDER OR INTO FLOUR Russian patent published in 2017 - IPC B02C7/00 

FIELD: technological processes.

SUBSTANCE: materials are ground and comminuted in the gap between the outer surface of the rotating lower grindstones and the inner surface of the opposite rotating upper grindstone, which is made in the form of a truncated cone with cross-cutting central stepped-diameter hole or channel containing four steps, while the lower grindstone is specified a rotation frequency of not less than 100 rpm clockwise and the upper grindstone - not less than 10 rpm in the opposite direction. The first step of the upper grindstone is cylindrical, the second and third ones - are conical with an increasing cone diameter in each step from top to bottom, and the fourth - one is in the form of a flat horizontal ring. While the lower grindstone is made in the form of a truncated cone with a large base, set horizontally, parallel and coaxial to the larger base of the upper grindstone, forming a gap between the large bases, and in the center of this base, a stationary mill grater is upright and rigidly installed coaxially the grindstones, in the form of a stepped cone of three steps, where the first upper one is conical, with an inclination angle to the axis of 15°, the second step cone has an inclination angle of 45°, and the third step cone - 75°.

EFFECT: continuous grinding of dry small materials.

6 dwg