Locomotive welding automatic locating platform

The invention belongs to the field of locomotive machining, and particularly discloses a locomotive welding automatic locating platform. A first transverse rod, a vertical rod and a second transverserod are arranged on a rack. The upper end of the vertical rod is in sliding connection to the first transverse rod. The lower end of the vertical rod is in sliding connection to the second transverserod. A cold pressing block, a welding head and a hot pressing block are sequentially and fixedly connected to the second transverse rod. A ball screw is fixedly connected to the end of the second transverse rod and is in threaded connection with a nut. A cam is fixedly connected to the nut. A piston barrel is fixedly connected to the rack, a piston is in sliding connection in the piston barrel, apiston rod is fixedly connected to the piston, and the piston rod and the cam are in sliding fit. A vortex tube is arranged on the rack and comprises an air inlet end, a cold air outlet end and a hotair outlet end. The air inle