Connecting device for door shaft of air door

The utility model discloses an air door shaft connecting device which comprises a door shaft, the door shaft is matched with a door shaft sleeve, a torsion spring is embedded in the inner wall of the door shaft sleeve, a connecting base is installed at the bottom of an inner cavity of the door shaft sleeve and comprises a rotating shaft, one end of the rotating shaft is installed at the bottom of the inner cavity of the door shaft sleeve through a bearing, and an inverted-cone-shaped groove is formed in the top end of the other end of the rotating shaft. The inverted-cone-shaped groove is formed in the direction perpendicular to the axis of the rotating shaft and matched with the top end of the door shaft. According to the air door shaft connecting device, the door shaft and the door shaft sleeve are convenient to align in the installation process through the slope design of the door shaft sleeve opening and the cone design of the top end of the door shaft; the rotating shaft is mounted at the bottom of the c