Large spacecraft cabin friction stir welding circular seam welded junction gap on-line clamping device

A friction stir welding circular seam welded junction gap online clamping device for a large spacecraft cabin is characterized in that through holes of a guide column and a locking rod are formed in one end of an upper pressing plate and one end of a lower pressing plate, and a guide column connecting shaft and a locking rod connecting shaft both penetrate into the side face of the upper pressing plate; the guide column penetrates through the lower pressing plate, one end of the guide column is connected with the guide column connecting shaft, the other end of the guide column is a free end, and the upper pressing plate and the guide column are connected into an integral rigid structure through the guide column connecting shaft. The locking rod penetrates through the lower pressing plate, one end of the locking rod is hinged to the locking rod connecting shaft, the other end of the locking rod is a free end, and a locking nut is arranged at the joint of the locking rod and the lower pressing plate and used fo