SPIRAL DRUM SCREEN FOR SIZING CONSTRUCTION MATERIALS Russian patent published in 2013 - 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. Proposed screen comprises trough closed on all sides with helical hollow drums arranged in tiers, one above the other, vibroexciters and elastic elements, loose material loaders and unloaders. Every drum is composed of, at least, one perforated strip bent in straight lines equally spaced apart at equal angles to perforated strip lengthwise edges to make identical perforated parallelograms located thereon behind the bend to alternate in opposite directions. Said perforated strip is Every drum is composed of, at least, one perforated strip bent in straight lines equally spaced apart at equal angles to perforated strip lengthwise edges to make identical perforated parallelograms located thereon behind the bend to alternate in opposite directions.

EFFECT: expanded performances and higher efficiency.

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