Abstract: A hydraulic systems for upper cavity lifting and down cavity lifting was designed for the out-side decoration equipment of mold on the basis of the process principle. The hydraulic system includes a variable capacity pump-hydraulic cylinder volumetric speed control loop, and a dual master cylinder directional control valve in a series of interlocking circuits. Meanwhile, a pre-directional control valve was adopted to make the master cylinder reverse smoothly after the cavity pressure was released. A pneumatic system for upper blank holder lifting and heating mechanism moving was designed by use of electromagnetism directional valves to control the out-side decoration system of molds. An AMESim software was employed to simulate this hydraulic system, and the result confirmed a high accuracy for the hydraulic system designed in this work.

Key words: ou-tside decoration equipment, hydraulic system, pneumatic system, loop, electromagnetism directional valve