SCREW DRUM SCREEN Russian patent published in 2015 - IPC B07B1/22 

FIELD: mining.

SUBSTANCE: screw drum screen includes a drum, a drive, and loading and unloading devices. A drum is made along the perimeter in the form of a multi-turn screw perforated screening surface with screw grooves inside the screening surface in the form of pockets of a curved shape with centres of curvature of the pockets of the curved shape of the screw perforated screening surface, which are located inside its cross section. It is made of three and more similar perforated strips of a rectangular shape, which are twisted in longitudinal direction relative to the longitudinal axis and bent along a screw line in cross direction on a cylindrical mandrel, with formation along the screening surface perimeter of three and more internal curved perforated surfaces of a convex shape with curvature centres inside the screening surface and formation inside it of overlaps in the form of screw blades throughout the length of the screening surface from an inlet hole to an outlet hole. Throughout the length of the screening surface there mounted is a spring of a wave-like shape with a flat section of turns, which is equipped with a device for changing of a pitch of turns by its tension or compression.

EFFECT: increasing screening intensity and improving efficiency.

7 dwg