A tapered cone sleeve is added to the original coupling, and the coupling and shaft are matched together through the intermediate cone sleeve. The inner surface of the taper sleeve is matched with the shaft, the taper of the outer surface is 1: 10 (the taper is the same as the inner surface of the corresponding coupling), the end surface is drilled with threaded holes and bolt holes, the taper sleeve is machined with a keyway, and the shaft and the coupling are connected through the taper sleeve and the key.