Abstract: In order to make the doubleposition extrusion hollow blow molding more smoothly with more accurate location and easier operation, the buffer hydrocylinder, hydraulic circuit, bottle blow control method, and the air blow equipment were improved. After the improvement was accomplished, the safety, production efficiency, and product qualification rate of the machine was greatly increased.

Key words: double position plastics extrusion hollow blow molding machine, buffer hydrocylinder, buffer hydraulic circuit, bottle blow control method, air blow equipment