基于PLC的注塑机液压系统的控制设计

Design of Hydraulic Control System for Injection Molding Machine Based on PLC

通过分析注塑机液压系统的工作过程,设计了基于PLC的电气控制系统,设计包括硬件和软件设计.采用先进的顺序控制设计法进行程序设计,在画出顺序功能图SFC的基础上,利用通用的PLC编程元件及起保停电路的编程方式进行模块化编程,程序具有简洁明了、调试简单、修改容易、通用性强的优点,适用于任意型号的PLC.实践表明:采用PLC改造的电气控制系统大大提高了注塑机的工作性能和稳定性,提升了注塑产品的质量和生产效率,且系统维护方便.

The working principle about hydraulic system of injection molding machine and the working requirement are introduced,then the electrical control system including hardware and program based on the PLC is designed.The programming way of Start-Retention-Stop Electric Circuit to modular programming is employed.After drawing sequential function chart,modularized programming is achieved by using PLC programming components,therefore the program is concise,simple debugging,easy to modify,and has strong versatility,which is suitable for any type of PLC.The finding shows that：the modified electrical control system can greatly improve the production precision,working performance,maintenance and stability of injection molding machine,improve the quality and production efficiency of the products.