Flexible automatic welding positioning tool for tubular cross beam

The invention discloses a flexible automatic welding positioning tool for a tubular cross beam. The flexible automatic welding positioning tool comprises a tool base, a left servo centering mechanism, a right servo centering mechanism, a left displacement air cylinder, a right displacement air cylinder, a front air cylinder clamping mechanism, a rear air cylinder clamping mechanism and an up-down servo positioning mechanism, the left and right servo centering mechanisms are used for centering the tubular cross beam; the left-right displacement cylinder is used for adapting to the length change of the tubular cross beam; the front-back air cylinder clamping mechanism is used for limiting the freedom degree of the tubular cross beam in the front-back direction. And the up-down servo positioning mechanism is used for adapting to the size change of the tubular cross beam in the height direction. According to the positioning tool, it can be guaranteed that the positioning tool is universal for tubular cross beams