Determining device for analyzing and designing flaw detection welding seam position of pressure vessel

The invention relates to a weld joint position determining device for analyzing and designing flaw detection of a pressure vessel, which effectively solves the problem of easy missing detection. According to the technical scheme, the device comprises a circular ring capable of moving up and down, a sliding block moving along the circular ring is arranged on the circular ring, a square rod is fixed to the end, close to the center of the circular ring, of the sliding block, the square rod is sleeved with a square pipe moving in the length direction of the square rod, and the end, away from the square rod, of the square pipe is closed; the end, away from the square rod, of the square pipe is hinged to a shell with an opening facing the center of the circular ring, the left side and the right side of the opening end of the shell are each hinged to a shell, and springs are arranged at the ends, away from the center of the circular ring, of every two adjacent shells. Each shell is provided with a walking mechanism,