The present utility model discloses a connection structure between a screw and a transmission shaft of an injection blow molding machine, comprising a transmission shaft and a screw. One end of the transmission shaft is provided with a screw insertion hole, a first key groove is axially arranged on the wall of the screw insertion hole, and a plurality of screw positioning holes communicating with the middle of the screw insertion hole are radially arranged on the transmission shaft. The connection end of the screw is inserted into the screw insertion hole, a second key groove corresponding to the first key groove is arranged on the connection end of the screw, and a transmission key is arranged in the space formed by the first key groove and the second key groove. Positioning grooves corresponding to the screw positioning holes one-to-one are also arranged on the connection end of the screw inserted into the screw insertion hole, and screw stoppers with one end inserted into the positioning grooves are arranged in the screw positioning holes. The screw stoppers replace the half clamping ring for axial positioning of the screw, eliminating the need to machine an annular groove at the connection end of the screw, thus not greatly reducing the strength of the screw.

Country Code: CN

Application Number: CN201720005127.1