Air cylinder for automobile welding equipment

The air cylinder for the automobile welding equipment comprises a cylinder barrel, a rodless cylinder cover, an installation block and a sealing block, the installation block is installed on the inner wall of the rodless cylinder cover, a fixing plate is installed on the inner wall of the installation block, a long-strip-shaped spring is installed on the inner bottom wall of a cavity, a supporting rod is installed on the top of the long-strip-shaped spring, and the sealing block is installed on the supporting rod. A clamping block is mounted at the top of the supporting rod, a clamping groove is formed in the inner wall of the cylinder barrel, and a motor is mounted on the inner wall of the mounting block. According to the utility model, the long-strip spring, the mounting block and the clamping block are mounted, the clamping block is extruded and contracted into the mounting block by the cylinder barrel, and when the clamping groove is positioned at the top of the clamping block, the clamping block is sprun