Steel cylinder bottom ring pressing welding mechanism

The utility model discloses a steel cylinder bottom ring pressing welding mechanism which comprises a base, an installation box, a rotating shaft, a supporting block, a welding device, a placing block and a conveying device, the top of the supporting block is fixedly connected with an air cylinder, the output end of the air cylinder is fixedly connected with a junction box, and a main shaft outer positioning piece is fixedly installed at the bottom of the junction box. The main shaft, the spring mounting frame, the second spring and the limiting block are matched for use, so that in the welding process of the seal head and the first bottom ring, the positioning mold can always press the first bottom ring through the matched use of the spring mounting frame and the second spring, and the welding quality is improved. During welding, the first bottom ring is always attached to the end socket, the whole circle of a welding seam is uniform and does not protrude or sink, and therefore the welding quality is guarant