Large-diameter shell gas closing ring assembling mechanism

The utility model discloses a large-diameter shell gas check ring assembling mechanism which comprises a thrust cylinder and a shell body ejector. The thrust cylinder is a cylindrical piece with an opening in the lower end, and a threaded hole is formed in the center of the end face of the closed end of the thrust cylinder. The bottom of the projectile body ejector is a supporting circular plate with a plane lower surface, and a transmission screw rod is vertically fixed on the upper surface of the supporting circular plate; the thrust cylinder is connected to the side wall of the rear end of ammunition in a sleeving mode, the lower surface of a supporting circular plate of the ammunition body ejector is supported on the end face of the rear end of the ammunition, and a transmission screw of the ammunition body ejector is in threaded connection into a threaded hole in the closed end of the thrust cylinder to control the thrust cylinder to rotate relative to the ammunition body ejector. And the thrust cylinder