VIBRATORY SCREEN FOR SIZING CONSTRUCTION MATERIALS Russian patent published in 2013 - IPC B07B1/22 

FIELD: process engineering.

SUBSTANCE: invention relates to loose material classification and may be used in metallurgy, construction, chemical industry, etc. Proposed screen comprises screening surface, loader and unloader, and drive. Screening barrel-like surface is composed of sections to expand toward center, first from loader to screening surface medium point and connected in turns by one equilateral trapezoid, two identical inequilateral perforated trapezoids with height smaller than of first trapezoid. Lower bases of said perforated trapezoids are equal and smaller than equal top bases to square at faces of said sections. Square of every nest section is turned relative to square of previous section through 180 degrees. Note here that every connected section has bottom base square sides equal to those of top base square. Screening surface, from center to unloader, is composed of interconnected one equilateral perforated trapezoid, two identical inequilateral perforated trapezoids and second perforated equilateral trapezoid. Lower bases of said perforated trapezoids are equal and larger than equal top bases to square at faces of said sections. Square of every nest section is turned relative to square of previous section through 180 degrees. Note here that every connected section has bottom base square sides equal to those of top base square. Screening surface is mounted on the frame suspended by rubber cord air cylinders at the bed.

EFFECT: expanded performances and higher efficiency.

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