Replacement structure of nozzle ring assembly

The utility model discloses a nozzle ring assembly replacement structure, which comprises an adjusting ring plate, a positioning plate is arranged in the middle of the lower surface of the adjusting ring plate, lifting plates are symmetrically arranged at two ends of the side wall of the positioning plate through auxiliary replacement assemblies and oppositely move, and the bottom of the adjusting ring plate is rotatably connected with a plurality of groups of crossheads through quick replacement assemblies. Through the design that the multiple sets of second gears are all connected with the first gear in a meshed mode, when the first gear is rotated, the multiple sets of second gears can be driven to rotate, the second gears rotate to drive the threaded rod to rotate, and the threaded rod drives the second gears to do lifting motion; then, the crosshead can be made to be close to the mounting position of a screw for fixing the nozzle ring, then the first gear is pressed and rotated, multiple screws can be mo