Conveying screw of spiral concrete sprayer for building construction

The utility model discloses a conveying screw of a spiral concrete sprayer for building construction, and belongs to the field of concrete conveying. A hopper is fixedly connected to the upper portion of the peripheral side face of the barrel, a plurality of supporting frames are fixedly connected to the lower portion of the peripheral side face of the barrel, the peripheral side face of the barrel is fixedly connected with a first installation block and a second installation block respectively, a driving motor is fixedly installed on the upper surface of the first installation block, and the output end of the driving motor is in transmission connection with a transmission rod. The output end of the transmission rod is fixedly connected with a driving belt wheel, a belt is arranged on the circumferential side face of the driving belt wheel, and the left side face of the barrel is in threaded connection with a rear cover rotationally connected with a worm. Through the arrangement of the rear cover, the worm an