Air blowing mandrel mechanism and hollow blow molding machine

The invention discloses an air blowing mandrel mechanism, and relates to the technical field of blow molding machines. The air blowing mandrel mechanism comprises an electric push rod, a two-stage telescopic mechanism and an inner mandrel, wherein the inner mandrel is arranged in the two-stage telescopic mechanism and driven by the electric push rod, and when the electric push rod outputs power, the two-stage telescopic mechanism is driven to be unfolded; the inner mandrel is of a hollow structure and connected with a cold air inlet hole through a communication hole formed in the inner mandrel; a pressure stabilizing mechanism is further mounted in the inner mandrel and used for adjusting the pressure of cold air; an air outlet hole is formed in the two-stage telescopic mechanism, and whenthe inner mandrel drives the two-stage telescopic mechanism to be unfolded, the air outlet hole is kept communicated with the inner mandrel; and the air blowing mandrel mechanism has the advantages that the inner mandrel is