Expanding coupling sleeve type high-rigidity coupling

The utility model discloses an expanding coupling sleeve type high-rigidity coupling. The expanding coupling sleeve type high-rigidity coupling comprises a middle body, a left flange sleeve and a right flange sleeve, wherein the left flange sleeve and the right flange sleeve can be respectively and fixedly connected with the middle body, a through hole is formed in the center of the middle body, a left taper sleeve and a right taper sleeve are coaxial with the through hole and are arranged on two sides of the middle body, and tapered through holes corresponding to the left taper sleeve and the right taper sleeve are formed in the left flange sleeve and the right flange sleeve. According to the expanding coupling sleeve type high-rigidity coupling, the taper of the middle body and the taper of the flange sleeves are redesigned, the distribution of deformation stress generated by an expanding coupling sleeve is more even when the coupling enables a pressurized bolt to be screwed, a mandrel can be effectively he