PASS SCREEN Russian patent published in 2012 - IPC B07B1/22 

FIELD: process engineering.

SUBSTANCE: invention relates to screening rocks and construction materials, crushing and sorting jobs, and screen sizing of construction materials. Pass screen comprises sieving surface, drive, loading and unloading devices. Proposed plant comprises driven drum made up of three and more variable-width concave strips, folded in vertical plane in transverse direction and bended along the notches, and having walls skewed in crosswise-lengthwise direction and arranged in pairs at angle to each other to make variable-pitch zigzag screw lines and surfaces. Helical spring with device to vary turn pitch by spring compression or expansion is arranged along container length.

EFFECT: higher efficiency, screen self-cleaning.

7 dwg