具有变超越负载的液压调平系统负载口独立控制方法  

Independent Metering Control Method of Hydraulic Leveling System with Variable Over-running Load

作　　者：魏列江[1,2] 都志航 李娜娜[1,2] 王琳 路全锋[1,2] WEI Liejiang;DU Zhihang;LI Nana;WANG Lin;LU Quanfeng(Energy and Power Engineering College,Lanzhou University of Technology,Lanzhou,Gansu 730050;Key Laboratory of Advanced Pumps,Valves and Fluid Control System of the Ministry of Education,Lanzhou University of Technology,Lanzhou,Gansu 730050)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学特种泵阀及流控系统教育部重点实验室,甘肃兰州730050

出　　处：《液压与气动》2024年第8期1-10,共10页Chinese Hydraulics & Pneumatics

基　　金：国家重点研发计划(2022YFB3403003)。

摘　　要：液压调平系统平台回落过程中存在超越负载,且随着负载重心偏移和平台倾角变化,作用于支腿液压缸的负载力也会随之变化。传统液压系统中负载控制阀或平衡阀在平衡变超越负载时速度控制效果差,容易发生速度抖动。为解决这一问题,采用负载口独立控制技术,针对平台回落时液压缸存在的变超越负载工况,提出对液压调平系统中液压缸有杆腔进行压力控制,无杆腔进行流量控制的压力-流量复合控制方法,建立其数学模型,并进行AMESim和Simulink联合仿真验证。结果表明,在负载力发生突变时,液压缸有杆腔压力和无杆腔流量均可在0.2 s内恢复至控制值,平衡掉系统变超越负载的同时,能够满足系统的速度控制需求。The platform of hydraulic leveling system exists over-running load during back down process,and with the load center of gravity shift and platform tilt changes,the load force acting on the outrigger hydraulic cylinder will also change.The traditional hydraulic system load control valve or counterbalance valve in the balance variable over-running load speed control effect is poor,easy to speed jitter.In order to solve this problem,the independent metering control technology is adopted,and for the variable over-running load condition of the hydraulic cylinder when the platform is falling back,the pressure-flow composite control method is proposed to control the hydraulic cylinder rod chamber in the hydraulic leveling system,and the flow control in the rodless chamber,and the mathematical model is established and verified by the joint simulation of AMESim and Simulink.The results show that,in the event of a sudden change in the load force,the hydraulic cylinder rod chamber pressure and rodless chamber flow can be restored to the control value within 0.2 s,balancing out the system variable beyond the load at the same time,to meet the system speed control requirements.

关 键 词：液压调平系统 负载口独立 压力-流量复合控制 变超越负载 

分 类 号：TH137[机械工程—机械制造及自动化]