The invention discloses a pressurized blow pin mechanism for blow molding machines, including a blow pin main body, a blow pin head, an air pipe, a sleeve and a pressurized elastic ring. A pressurized elastic ring is installed at the joint between the blow pin head and the air pipe. During operation, cold medium is introduced through the inner pressure port of the blow pin head, and high-pressure air from hollow plastic containers is introduced through the outer pressure port. The high-pressure cold medium compresses the outer flanged edge of the elastic ring to enhance contact pressure and sealing performance between the ring and the air pipe. Truncation angles are arranged at the upper and lower sides of the elastic ring to strengthen local compression and deformation, expand the contact area, and further optimize tightness. This structure solves the leakage problem of cold medium at the joint, which adversely affects cooling speed and cooling effect.
Country Code: CN
Application Number: CN202111287757.X
