Abstract
Abstract. Parison wall thickness electro-hydraulic control system is the core of parison wall thickness control for large scale blow molding machine. In order to ensure the equalization of the wall thickness for the hollow products and to save material, in this paper analyzed the project of the parison wall thickness electro-hydraulic control system for blow molding machine and designed the parison wall thickness electro-hydraulic positional closed-loop control system which adopted the high performance proportional valve. Through simulation analysis and experiment, it was proved that through positional feedback control of the core of high performance proportional valve, the response frequency of the electro-hydraulic proportional valve can be improved so as to improve the dynamic quality of the system, achieved the requirement for higher control precision and dynamic response and satisfied the requirement for fast speed and control precision for plastic extrusion-blow hollow molding machine. It can be seen that it is effective to adopt the closed-loop control strategy for Parison wall thickness electro-hydraulic control system and more important, it has operation significance for improving the quality and ensure the precision of the products.
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