Clamping and centering mechanism for steel rail welding

The utility model discloses a clamping and centering mechanism for steel rail welding. The clamping and centering mechanism comprises a clamping seat, a contact block and a clamping piston rod, the contact block is arranged at the end part of the clamping piston rod, the clamping seat is provided with a piston cavity, the clamping piston rod is arranged in the piston cavity, and the clamping device is characterized in that the clamping seat is straddled on a steel rail to be welded, and the contact block is driven by the clamping piston rod to realize centering and clamping of the acting edge of the steel rail to be welded; the problem of effective and reliable clamping of the steel rail in narrow space during turnout steel rail welding (especially a welding seam at the heel end of a frog and a switch rail) is effectively solved; the technical problem that at present, various steel rail welding machines at home and abroad cannot achieve reliable clamping in related narrow and small spaces is solved. 本实用新型公开了一