GRATE Russian patent published in 2014 - IPC B07B1/22 

FIELD: construction.

SUBSTANCE: grate contains the sifting surface, drive, loading and unloading accessory devices. Sifting surface is made of sections with formation of three or more broken right and left helical lines directed to each other along the inner perimeter, as well as internal three or more helical grooves with the same pitch. Sections are mounted from two subsections, designed of three or more isosceles perforated trapezoids and isosceles perforated triangles serially joined inter se by lateral sides, the bases of which are disposed in different directions in subsection. Sections are joined inter se by large bases of perforated trapezoids. Subsections are joined in section so that the bases of isosceles perforated triangles of one subsection are attached to the upper base of isosceles perforated trapezoids of the second subsection, and the bases of isosceles perforated triangles of the second subsection are attached to the upper base of isosceles perforated trapezoids of the first subsection. Waveform spring with flat section of coils, which is equipped with device for changing the pitch of coils by stretching or compressing, is mounted along the entire length of sifting surface.

EFFECT: increased intensity of grating, improved productivity.

5 dwg