Two-stage screw conveyor for shield

The utility model discloses a two-stage screw conveyor for shield tunneling, which relates to the technical field of conveyors of shield tunneling machines and comprises a mounting frame and a connecting pipe. Three conveying pipelines, namely an inclined material pipe, a bent pipe and a transverse material pipe, are fixed on the mounting frame; the axis of the inclined material pipe and the axis of the transverse material pipe form an included angle smaller than 180 degrees, and the bent pipe is located between the adjacent ends of the inclined material pipe and the transverse material pipe; the number of the connecting pipes is two, the connecting pipes are arranged among the three conveying pipelines respectively, the two ends of the two connecting pipes are rotationally connected with the corresponding ends of the three conveying pipelines respectively, and the connecting pipes and the conveying pipelines are combined into a continuous sealed pipeline; spiral conveying rods matched with the inclined mater