Automatic mounting tool for negative pressure cap of large cylindrical battery

An automatic mounting tool for a large cylindrical battery negative pressure cap comprises a square bottom plate, and a plurality of bottom plate through holes are formed in the bottom plate; a vertical side plate is arranged on the edge of the bottom plate; a square tool cover plate is connected to the upper portion of the bottom plate through supporting columns, a plurality of cover plate through holes vertically corresponding to the bottom plate through holes are formed in the tool cover plate, a spring mechanism unit is contained in each cover plate through hole, and an external negative pressure cap is arranged at the upper end of each spring mechanism unit. In the working process, the negative pressure cap is manually arranged on the spring mechanism unit, the spring mechanism unit is pushed to ascend through an external air cylinder below the negative pressure cap, the negative pressure cap is installed in the large cylindrical battery, and the spring mechanism unit is reset through a spring. By unifor