Scientific and technological advances, plastics in all areas of the national economy has become an indispensable material, plastic injection molding machine is to achieve a major plastics processing machinery and equipment. Injection molding cycle generally consists of four parts: the injection time, cooling time, mold opening and closing times, the auxiliary time. Wherein the auxiliary time including product ejection time and Choucha core time. For medium-sized complex molds, auxiliary time about 10% to 15% of the molding cycle. In the injection molding production process, the various stages of operation of the injection molding cycle sequence relation exists, there is overlapping relationship, thereby allowing shortening the molding cycle. But each operation is limited overlapping relationship, and therefore can not be efficiently shorten the molding cycle. Existing vertical injection molding machines are generally used to improve the hydraulic proportional technology, double pumps, accumulators, mechanical, electro-hydraulic proportional control technology, servo motor, external hydraulic control to improve the production cycle, but with these methods are relatively high cost. Therefore, based on the original vertical injection molding machine. critical to the entire injection molding machines for the plastics industry
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