Low-temperature wind tunnel contraction section shell assembling device and contraction section shell assembling method

The invention provides a low-temperature wind tunnel contraction section shell assembling device and a contraction section shell assembling method. A circular positioning plate is installed at the center of the upper surface of a positioning platform and coincides with the center of the positioning platform; the circular ring plate is mounted on the periphery of the upper surface of the positioning platform and is concentric with the circular positioning plate; the circular tube is vertically mounted in the middle of the circular positioning plate; the multiple layers of circumferential ribs are arranged on the inner circumferential wall of the contraction section shell at intervals in the direction of the central axis of the contraction section shell and are perpendicular to the central axis. Each group of supporting structures is mounted in the cavity of the corresponding layer of circumferential ribs, one end of each group of supporting structures is connected to the outer circumferential wall of the circu