Mechanical collapsible winding drum

The utility model discloses a mechanical collapsible winding drum, which relates to the technical field of winding and unwinding equipment, and comprises a collapsible driving motor, a main shaft bearing, a winding drum main shaft, a collapsible screw rod, a collapsible sliding sleeve and a collapsible gland, the collapsible driving motor and the main shaft bearing are relatively fixed, the rear end of the winding drum main shaft is rotatably arranged in the main shaft bearing in a penetrating manner, and the other end of the winding drum main shaft extends forwards; the expansion screw rod is rotatably arranged in the winding drum main shaft in a penetrating mode, the rear end of the expansion screw rod is in transmission connection with the expansion driving motor, the expansion sliding sleeve is arranged outside the winding drum main shaft in a sleeving mode, the expansion sliding sleeve synchronously rotates along with the winding drum main shaft and can slide in the axial direction, and the expansion gla