摘要
液压挖掘机由于上车回转平台转动惯量大、工作中高频次起制动,导致大量的制动动能转化为控制阀阀口热能浪费掉。为此,提出双马达主被动复合驱动挖掘机回转系统,主动系统采用阀口独立回路,应用泵阀复合、压力流量匹配控制策略抑制回转平台起动过程的节流和溢流损失,利用阀口独立回路多自由度控制的优点解决制动阶段转台冲击和反转问题;被动系统采用液压马达-蓄能器组合,回收利用回转平台制动动能;在空载制动过程中,通过增压缸向蓄能器补充油液。建立回转系统机电液联合仿真模型,并对所提系统的运行特性与能量特性进行分析。结果表明:满载和空载制动阶段蓄能器能量回收率分别为79%和72%,利用增压缸解决了蓄能器油液回收不足问题,较传统回转系统能耗降低54.3%。
Due to the large moment of inertia of the rotary platform on the excavator,the braking starts at high frequency,a large amount of braking kinetic energy is converted into heat energy at the valve port of the control valve and wasted.A double-motor active and passive combined drive excavator rotary system was put forward.The valve port independent control was adopted in active system,and pump-valve combination and pressure-flow matching control strategy were used to restrain throttling and overflow loss.The advantages of valve port independent control with multiple degrees of freedom were used to solve the impact and reversal problems in braking stage.The hydraulic motor-accumulator combination in passive system was adopted to recycle the braking kinetic energy of the rotary platform.During no-load braking,oil was replenished to the accumulator by booster cylinder.The electro-hydraulic co-simulation model of rotary system was established,and the operation and energy characteristics were analyzed.The results show that the energy recovery rate of the accumulator is 79% and 72% in full-load and no-load braking stages,respectively.The problem of insufficient oil recovery of the accumulator is solved by the booster cylinder,and the energy consumption of the accumulator is reduced by 54.3% compared with that of the traditional rotary system.
作者
王帆
黄伟男
权龙
郝云晓
刘灿杰
WANG Fan;HUANG Weinan;QUAN Long;HAO Yunxiao;LIU Canjie(Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education,Taiyuan University of Technology,Taiyuan Shanxi 030024,China;Jiangsu Advanced Construction Machinery Innovation Center Ltd.,Xuzhou Jiangsu 221004,China)
出处
《机床与液压》
北大核心
2023年第19期134-139,共6页
Machine Tool & Hydraulics
基金
国家重点研发计划(2020YFB2009804)
国家自然科学青年科学基金项目(52105067)。
关键词
回转系统
主被动驱动
阀口独立控制
能量回收
Swing system
Active and passive drive
Independent control of load port
Energy recovery
