Cold spinning device used for steel seamless gas cylinder

The invention discloses a cold spinning device used for a steel seamless gas cylinder. The cold spinning device comprises a core rod stretching in a cylinder blank to machine the inner surface, a connecting assembly connected to the end of the core rod, and a spinning wheel assembly located outside the cylinder blank. The spinning wheel assembly comprises a spinning wheel support, a spinning shaft rotationally arranged on the spinning wheel support in a matched manner, and spinning wheels arranged on the spinning shaft in a sleeving manner and abutting against the outer surface of the cylinder blank. One end of the spinning shaft stretches in a spinning wheel box body fixed to the spinning wheel support, and the other end of the spinning shaft stretches in an outer supporting sleeve fixed to the spinning wheel support. The end, in the outer supporting sleeve, of the spinning shaft is further sleeved with a supporting lining. Double rows of 6314 bearings are arranged between the supporting lining and the outer supporting sleeve. The part, stretching in the spinning wheel box body, of the spinning shaft is divided into a first shaft section, a second shaft section and a third shaft section, wherein the shaft diameter of the first shaft section, the shaft diameter of the second shaft section and the shaft diameter of the third shaft section are gradually decreased, the first shaft section is sleeved with a non-standard bearing, the second shaft section is sleeved with a thrust roller bearing and the third shaft section is sleeved with a tapered roller bearing. The connecting assembly comprises a connecting piece installed on a drive device and a butt joint located between the connecting piece and the core rod.