CONCRETE MIXER Russian patent published in 2014 - IPC B28C5/00 

FIELD: process engineering.

SUBSTANCE: invention relates to production of mortars. In compliance with first version, mixer drum perimetre is composed of multistart helical surface with screw grooves inside and outside said drum at the angle 5°-30° to rotational axis of the drum in the form of curved pockets with centers of curvature of said pockets arranged alternately inside and outside drum cross-section. Said drum is composed of at least one coiled strip with turns connected along lengthwise equal-width edges. Said strip is bent in wavy manner at flexure lines to make aforesaid unilateral helical surfaces in the form of curved pockets along outer and inner surfaces at the angle 5°-30° to the drum rotational axis. Said pockets can vary in both shape and sixe along perimetre of rods-rolls. Distance between flexure lines equals the sum of perimetres of pockets of inner and outer surfaces. In compliance with second version, mixer drum perimetre is composed of multistart helical surface with screw grooves inside and outside said drum at the angle 5°-30° to rotational axis of the drum in the form of curved pockets with centers of curvature of said pockets arranged alternately inside the drum cross-section. Said drum is composed of one equal-width strip coiled in helical turns interconnected along lengthwise edges and bent in wavy manner over crease lines located at the angle thereto. It makes screw grooves and screw surfaces inside and outside said drum at the angle 5°-30° to rotational axis of the drum in the form of curved pockets with centers of curvature of said pockets arranged alternately inside the drum cross-section. Said pockets can vary in both shape and sixe along perimeter of rods-rolls. Note here that distance between flexure lines equals the sum of inner perforated surface pocket perimetres.

EFFECT: higher efficiency.

2 cl, 12 dwg