基于变频调速的全液压矫直机双独立闭环研究  

Research on Double Independent Closed-loop of Full-hydraulic Leveler Based on Variable Frequency Speed Control

作　　者：和东平 黄庆学[1] 韩贺永[1] 王晶[1] 马丽楠[1] 王君[1] 

机构地区：[1]太原科技大学重型机械教育部工程研究中心,山西太原030024

出　　处：《机床与液压》2017年第3期134-138,122,共6页Machine Tool & Hydraulics

基　　金：国家青年科学基金项目(51505315);校青年科技研究基金项目(20133002)

摘　　要：为了实现全液压矫直机的多参数调节与控制,提高液压系统的工作效率和控制精度,提出了一种基于变频调速的独立位置闭环和压力闭环的控制方法。用变频电机取代普通三相异步电动机驱动定量泵实现对液压系统流量的在线实时无级改变,用比例溢流阀取代电磁溢流阀实现全液压矫直机的恒压力控制,同时也可以根据不同的板厚实现在线压力的无级改变,用内置磁致伸缩位移传感器来实时反馈液压缸活塞杆的位移实现对液压缸位置的精确控制。建立了全液压矫直机位置闭环和压力闭环双环独立控制模型,并在AMESim软件中通过仿真证明了该控制方法的正确性,最后在现场十一辊全液压矫直机上验证了该控制方法的可行性和实用性。A control method was presented based on variable frequency speed control for the independent position closed-loop and pressure closed-loop in order to realize the multi parameter adjustment and control of the full-hydraulic leveler and to improve the work- ing efficiency and control precision of hydraulic system. The online real time stepless change of the hydraulic system flow was realized by using frequency conversion motor instead of ordinary three phase induction motor to drive the fixed volume pump, the constant pres- sure control of the full-hydraulic leveler was realized by using the proportional relief valve instead of the electromagnetic relief valve, the on-line pressure of the stepless change could be realized according to different plate thickness, and the accurate control of the hy- draulic cylinder position was realized by using a built-in magnetostrictive displacement sensor to real-time feedback displacement of the hydraulic cylinder piston rod. A double loop control model of the position closed-loop and pressure closed-loop of the full-hydraulic lev- eler was established, and the correctness of the control method was proved by simulation in AMESim software. Finally the feasibility and practicability of the control method is verified by the eleven roll full-hydraulic leveler in the production.

关 键 词：全液压矫直机 双独立闭环 变频电机 比例溢流阀 

分 类 号：TH137[机械工程—机械制造及自动化]