Quick-release air knife of package thermal-shrinking oven

A quick-release air knife of a package thermal-shrinking oven, comprising:

• at least one fixing ring, the fixing ring being formed, in an interior thereof, with at least through hole, a periphery of the through hole being formed with at least one pair of notches and fixing holes, the notches being in communication with the through hole;
• at least one pair of fixing elements, which have upper ends combined with and fixed to a bottom portion of a hot airflow combination box arranged on a top portion of a package thermal-shrinking oven and lower ends correspondingly extending into the fixing holes of the fixing ring and connected to and fixed to the fixing holes;
• a plurality of air knife tubes, each of the air knife tubes having a top portion that is formed with a connecting portion and at least one pair of fitting blocks, wherein the connecting portion and the fitting blocks of the air knife tube respectively correspond to and match with the through hole and the notches of the fixing ring, and the top portion of the air knife tubes is upward movable to pass through the through hole and the notches and then rotated by an angle to have the fitting blocks fit to a top surface of the fixing ring and to have the connecting portion of the air knife tube connected to the bottom portion of the hot airflow combination box for introducing a hot airflow into the air knife tube;
• and
• a plurality of air knife blades, each of the air knife blades being combined to outside of the air knife tube, the air knife blade guiding a discharging direction and path of the hot airflow discharged from the air knife tube.