TUBULAR HELICAL MILL Russian patent published in 2009 - IPC B02C17/00 

FIELD: technological processes.

SUBSTANCE: invention is related to procedure of hard materials grinding. Tubular helical mill comprises loading, unloading journals, drive and drum made of tetrahedral or octahedral elements joined to each other, creating a helical column. Drum is assembled out of sections made of eight, ten, twelve and other even number of equilateral triangles joined to each other by two lateral sides. Sections are joined to each other by free third sides of triangles with creation of helical drum, on perimeter of which there are four, five, six and more broken right and left helical lines directed opposite to each other, and is equipped with internal four, five, six and more helical grooves directed opposite to each other with identical pitch.

EFFECT: increased frequency of motion and collision of ground materials particles to each other.

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