Cold air cooling type film blowing machine convenient to overhaul

The utility model discloses a cold air cooling type film blowing machine convenient to overhaul, which comprises a base, and a main machine body protection device is fixedly arranged on the upper end face of the base. The main machine body protection device comprises two main machine body protection shells, a protection shell connecting plate, a connecting shaft, a rectangular block, a connecting groove, a spring movable groove, a spring, a rectangular fixed block, a movable shaft, a rotating shaft, an internal thread groove, a screw, a fixed internal thread sleeve and a limiting plate, the number of the main machine body protection shells is two, and the main machine body protection shells are connected with the base through the rotating shaft; four rotating shafts are arranged on one side of the inner wall of the main machine body protection shell, four connecting shafts are arranged on one side of the inner wall of the main machine body protection shell, rectangular blocks are fixedly arranged at the other