Taper sleeve structure for coupler

The utility model provides a taper sleeve structure for a coupler, which is characterized in that the taper sleeve structure comprises an inner disc (11) and a taper sleeve (12), the inner disc (11) is internally provided with a mounting hole (112), the taper sleeve (12) comprises a cover body (121) and a sleeve body (122) fixed at the bottom of the cover body, the sleeve body (122) extends into the mounting hole (112), and the taper sleeve (12) is fixedly connected with the inner disc (11) through a fixing piece (13). A spline hole (1211) is formed in the taper sleeve (12), a spline is arranged on the inner wall of the spline hole (1211), and a spline shaft (7) extends into the spline hole (1211) and is connected with the spline of the taper sleeve (12); an inner disc in the prior art is replaced by a structure combining the inner disc and the taper sleeve in the scheme, only the corresponding taper sleeve needs to be matched according to the spline shaft, the manufacturing types of the inner disc are reduce