Novel air flow screening machine

The utility model belongs to a novel air flow screening machine of the field of separation. The utility model is mainly characterized in that a cylindrical screen and a conical table on which a helical blade is arranged are coaxially arranged on a bottom frame in a body of the cylinder type screening machine, a fine powder discharging pipe is arranged under a bottom frame between the cylindrical screen and the body, a coarse powder discharging pipe nozzle is arranged below the bottom frame in the cylindrical screen, and a double-pipe feeding spiral casing is arranged on the body of the cylinder type screening machine. The utility model makes use of a screening principle to slickly and organically combine a net screening technical mode and a no-net screening technical mode together and has the advantages of high classification efficiency, small classification grain diameter, energy saving, high efficiency, broad application, simple operation, easy repair and maintenance, etc.