The present invention discloses an air blowing mandrel mechanism, relating to the technical field of blow molding machines. It comprises an electric push rod, a two-stage telescopic mechanism and an inner mandrel; the inner mandrel is arranged in the two-stage telescopic mechanism, driven by the electric push rod, and drives the two-stage telescopic mechanism to expand when the electric push rod outputs power. The inner mandrel is of a hollow structure, connected with a cold air inlet hole through a communication hole formed thereon, and a pressure stabilizing mechanism is also installed in the inner mandrel for adjusting the cold air pressure; an air outlet hole is formed on the two-stage telescopic mechanism, and when the inner mandrel drives the two-stage telescopic mechanism to expand, the air outlet hole remains communicated with the inner mandrel. The beneficial effects of the present invention are: the inner mandrel is located inside the two-stage telescopic mechanism, which does not affect the normal expansion and contraction of the inner mandrel, and can also form good protection for the inner mandrel. Especially, the design of the pressure stabilizing mechanism enables cold air to be discharged from the air outlet hole at a stable pressure, and its structure is integrated with the inner mandrel without the need for additional devices such as a pressure stabilizing valve outside.
Country Code: CN
Application Number: CN201910986646.4
