Civil air defense equipment door frame welding device

The civil air defense equipment door frame welding device comprises a placing table and a workbench fixedly arranged on the placing table, a plurality of positioning mechanisms used for fixing cross beams are arranged on the workbench, and a clamping mechanism used for fixing two longitudinal beams is arranged on the workbench; a first rodless cylinder is fixedly arranged on the placing table, and the first rodless cylinder is horizontally arranged; a piston of the first rodless cylinder is fixedly provided with a second rodless cylinder, and the second rodless cylinder is vertically arranged; a third rodless air cylinder is fixedly arranged on a piston of the second rodless air cylinder, and the third rodless air cylinder is horizontally arranged and is perpendicular to the length direction of the first rodless air cylinder. And a mounting block is rotationally arranged on the third rodless air cylinder, a welding device for welding the connecting joint of the cross beam and the longitudinal beam is arranged