伺服电动机直接驱动定量泵液压系统在精密注塑中的应用及其控制策略  

Application and Control Strategy of Servo Motor Driven Constant Pump Hydraulic System in Precision Injection Molding

作　　者：彭勇刚[1] 韦巍[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《机械工程学报》2011年第2期173-179,共7页Journal of Mechanical Engineering

基　　金：国家科技支撑计划(2007BAF13B03);浙江省教育厅(Y201009953)资助项目

摘　　要：精密和节能是注塑工业的两大发展趋势。针对传统液压系统注塑机注塑过程的高能耗、低响应的特点,设计一种伺服电动机直接驱动定量泵的闭环液压控制系统,实现注塑过程的精密节能控制。该液压系统采用伺服电动机驱动定量泵及压力传感器来代替原注塑液压系统中的普通电动机驱动定量泵及压力、流量比例阀,构成一种节能、响应快速、易于实现精确闭环控制的注塑液压系统。基于上述液压系统,提出一种基于模糊滑模控制的压力、速度控制策略,达到了注塑过程液压系统压力、流量的精确控制。并根据注塑过程中压力、流量耦合的特点,提出一种压力、速度切换控制策略。试验表明采用该模糊滑模控制方法及压力、速度切换控制策略的伺服电动机直接驱动液压系统注塑机响应迅速,压力、速度控制精度高,节能效果好。Precision and energy-saving are development tendencies of injection molding industry.In view of the high energy consumption and low response of the traditional hydraulic system for injection molding machine,a servo motor driven constant pump hydraulic system is designed for precision injection molding process,which uses servo motor,constant pump and pressure sensor instead of common motor,constant pump,pressure and flow proportion valve.This hydraulic system has the advantages of energy saving,quick response easy and accurate control.Then a pressure and speed control strategy based on fuzzy sliding mode control is proposed for accurate control of pressure and flow of hydraulic system in the injection molding process.Moreover,according to the characteristics of pressure/flow coupling in the injection molding process,a control strategy for pressure/speed switching is proposed.Test results show that this hydraulic system features quick response,high-accuracy control of pressure and speed,and good energy-saving effect.

关 键 词：伺服驱动 精密注塑 滑模控制 液压系统 节能 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]