STONE SEPARATING MACHINE FOR GRAIN CLEANING Russian patent published in 2006 - IPC B07B9/00 B07B9/02 B07B4/00 B04C9/00 

FIELD: grain cleaning equipment, in particular, stone separating machines with recirculation of main air flow, may be used in milling and groats producing industry for cleaning of grain from mineral mixture.

SUBSTANCE: stone separating machine has housing incorporating working deck, sucking collector located in upper part of housing and pressure collector located in lower part of housing, feeding and distributing apparatus, motor-vibrators for imparting vibrations to housing, and air recirculation system. Recirculation system consists of settling device for carried-away material, radial fan, and sluice gate for discharging of carried-away material, and is connected to housing upper and lower parts through air ducts. Settling device for carried-away material is made in the form of spiral settler with inlet and outlet branch pipes, settler horizontal branch pipe and cylindrical baffle-type grid, with horizontal branch pipe and baffle-type grid being arranged within settler. Inlet branch pipe of settler is connected to sucking collector of housing of stone separating machine. External branch pipe of settler is connected to sucking opening of radial fan, in axially aligned relation to baffle-type grid. Horizontal cyclone is connected to spiral settler via single horizontal slit. Horizontal cyclone consists of external housing and internal branch pipe. Cyclone internal branch pipe is connected via air duct to horizontal branch pipe of settler. External housing of cyclone is choked at the side adjoining air duct and is equipped with spiral arranged at opposite side and connected through gravity-flow pipeline with slice gate. Throttling device arranged within spiral of horizontal cyclone is made in the form of cone movable axially of horizontal cyclone for allowing slot between cone and internal branch pipe of cyclone to be adjusted. Pressure collector is equipped with air distributing rotating gates.

EFFECT: stabilized operation of stone separating machine with recirculation air flow owing to increased efficiency in catching of light admixtures within settling device for carried-away materials to thereby increase efficiency in separating of mineral admixtures.

3 cl, 2 dwg