Conveying and mixing arrangement, particularly for powdered and/or particulate masses

Claim 1

An arrangement for conveying and mixing at least two different dry particulate components and including for each such component a container and a conveyor driven by a power source, said conveyors being arranged to bring together from their respective containers such components into a driven mixing screw having a feed-in end and a feed-out end; a first conveyor for a first component being a screw conveyor joined with and changing into the feed-in end of said mixing screw, said first conveyor having a smaller pitch and smaller diameter than said mixing screw; said first conveyor and said mixing screw being substantially enclosed by a common casing having a substantially constant inner width; said first conveyor and mixing screw having a common shaft of constant diameter; a second conveyor for a second component being arranged to discharge and to feed the mixing screw above the feed-in end of the mixing screw, the screw surface of the mixing screw being continuous and imperforate between the shaft and a peripheral outer edge at a constant radial distance from the shaft, a radius to said screw surface having an angle of inclination relative to a plane perpendicular to the lengthwise direction of said shaft and inclining away from said plane in a direction towards the feed-out end of the mixing screw, the mixing screw having its diameter, pitch, r.p.m. and angle of inclination relative to a horizontal plane so mutually adapted to the voLume of the components brought together that said components only partly fill said mixing screw and are imparted a rolling, tumbling movement on their way towards the feed-out end of the mixing screw, thus causing an effective dry mixing of the components.