CONCRETE MIXER (VERSIONS) Russian patent published in 2012 - IPC B28C5/20 

FIELD: process engineering.

SUBSTANCE: invention relates to production of construction materials. Concrete mixer tapered case with screw lines made on side surface and loading-unloading appliances. In compliance with first version, case perimetre consists of three and more strips twisted along spiral in lengthwise direction and bent in crosswise direction on tapered mandrel of trapezoidal shape and different widths. Said strips increase along case length from loading side to unloading side to form three and more screw grooves and screw lines with variable increasing pitch from loading side to unloading side as well as inner curvilinear concave surfaces with centres of curvature located outside of the case. In compliance with second version, said case is made up of three and more trapezoidal screw strips interconnected along the case length. Sizes of said strips increase over the width from loading side to unloading side to form three and more inner curvilinear convex surfaces inside the case and to form screw blade lap joints inside the case from loading side to unloading side.

EFFECT: expanded operating performances, simplified design.

2 cl, 14 dwg