Cannonball belt press-fitting device

The utility model discloses a shell belt press-fitting device and belongs to the technical field of shell production. A hydraulic oil cylinder is arranged on a workbench, a piston is arranged in the hydraulic oil cylinder, a piston rod extending out of the hydraulic oil cylinder is arranged on the piston, a plurality of stand columns are arranged on the top of the hydraulic oil cylinder, the tops of the stand columns are connected with a supporting plate, and an eight-petal die is arranged on the supporting plate. The eight-petal mold is in a circular truncated cone shape, all petals of the eight-petal mold can horizontally and centripetally move on the supporting plate, the top of the piston rod is fixedly connected with a fixing plate, the top of the fixing plate is connected with an outer mold through a connecting plate, a cavity matched with the side wall of the eight-petal mold is formed in the center of the outer mold and abuts against the side wall of the eight-petal mold, and a containing cavity is fo