Mix A transport device, comprising a main conveyor system with a pipe (1) includes and at least one in the conduit (1) according to the longitudinal direction mounted auxiliary conveying screw (2) and means (3) for driving the auxiliary conveying screw (2), characterized in that the main conveyor a shaftless main conveyor screw (4) which is mounted in the longitudinal direction of the conduit (1) and which the auxiliary conveying screw (2) surrounds and means (5) for driving the main conveyor screw (4) so that they have a transmission in the opposite sense of the transport caused by the auxiliary conveying screw (2).
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