Novel quick dismounting and replacing mechanism with accurate positioning and locking functions

The utility model relates to a novel quick dismounting and replacing mechanism with accurate positioning and locking functions. The quick dismounting and replacing mechanism comprises a quick dismounting upper support and a quick dismounting lower support. The quick dismounting and replacing mechanism further comprises a blind rivet and a locking shaft. The pop-rivet is installed on the quick-release upper support, an annular groove is formed in the pop-rivet, the pop-rivet is a lock neck, and the part, located below the lock neck, of the pop-rivet is a lock head; the locking shaft is installed in the quick-release lower support and rotationally connected with the quick-release lower support, a column groove for the lock head to stretch in is formed in the locking shaft, an opening is formed in the side wall of the locking shaft, and the opening right faces and is communicated with the column groove. The distance between the openings is larger than the size of the lock neck and smaller than the size of the lo