COMPLEX FOR SIZING CRUSHED UNDERSIZE PRODUCTS IN PRODUCTION OF NONMETALLIC CONSTRUCTION MATERIALS Russian patent published in 2012 - IPC B07B4/00 

FIELD: process engineering.

SUBSTANCE: invention relates to equipment intended for production on nonmetallic construction materials and may be used for production of gravel and sand from grinding-sorting plants processing igneous rocks. Proposed complex comprises rock feed vibrating screen with solid sheet secured to its underscreen frame, chamber with separation walls provided with rotary appliances and accumulation funnels for sixing rocks, compressed air feed source to feed compressed air into said chamber at acute angle to screen surface, suction branch pipe arranged at chamber top and communicated via pipeline with compressed air source suction branch pipe. Compressed air source is made up of two blower or one compressor. Separation walls are made up of tubes consisting of two vertical sections arranged on sides of the chambers and end horizontal section arranged at their top part and provided with lengthwise slot-like cutout and web at its center. Slot-like cutout is directed from sieve. Tube top horizontal and vertical sections are interconnected via detachable curved branch pipes provided with flanges. Identical branch pipes are arranged under tube vertical sections and articulated to complex frame to allow tube to turn in vertical plane. Every tube is covered by sheet on sieve side secured on vertical sections. Sheet top section represents inclined nose covering in plan the tube horizontal section. Nose inclination angle α to horizon is taken to exceed angle of rock mass friction against node outer surface. Separation wall height h decreases as walls move off from sieve at pitch I. Every tube with complex frame is articulated by tie rods with hinged and screw coupling while, on both sides, it is connected by corrugated branch pipes and airflow control valves with blower pressure tubes. All separation walls in initial position are inclined from screen at angle β defined by size of target fraction. First separation wall top edge is arranged under screen discharge edge.

EFFECT: higher efficiency and accuracy of fractionation.

3 dwg