Powder return pipeline device of 3D printing equipment

The utility model discloses a powder return pipeline device of 3D printing equipment, which comprises a tank body and a powder return pipeline, a conical hopper is welded in an inner cavity of the tank body, a through feeding connecting pipe is welded on the side surface of the conical hopper, a filter bag dust remover is fixedly mounted at an upper port of the tank body, and the filter bag dust remover comprises a rectangular box body; a first partition plate and a second partition plate are fixedly installed in an inner cavity of the box body, a plurality of through round pipes are welded tothe first partition plate, a cylindrical filter bag is connected to the upper ends of the round pipes, a plurality of round holes are distributed in the second partition plate, and a through air suction connecting pipe is welded to the upper side of the box body. The centrifugal fan is used for exhausting air, so that negative pressure is generated in the box body and the tank body, rotational flow sedimentation of dust