变转速非对称泵直驱液压挖掘机斗杆试验研究

发布时间：2018-04-02 02:34

本文选题：非对称泵　切入点：四象限运行　出处：《机械工程学报》2017年16期

【摘要】：由于结构紧凑,易于并行驱动多执行器等优点,阀控液压缸系统被广泛应用于工业和工程自动化装备,存在问题是节流损失大,能量效率低。为了降低液压系统能耗,有效的方法是采用直接泵控技术,消除节流损失。但传统进出口流量对称型液压泵驱动非对称液压缸系统,需要附加复杂的回路补偿非对称液压缸面积差,并且当液压缸负载方向频繁变化时,控制腔交替变化,液压缸运行平稳性差。针对上述问题,提出一种能够匹配非对称液压缸面积差的非对称泵控缸闭式系统方案,并将其应用于控制具有四象限工作特性的液压挖掘机斗杆。为了验证新提出方案的可行性,在前期仿真研究基础上,构建非对称泵控液压挖掘机斗杆试验系统,对采用新方案后斗杆的运行和能效特性进行研究。测试结果表明,新系统具有良好的控制特性,可消除负载方向改变造成的速度波动,与采用泵阀复合进出口独立控制系统相比,一个工作循环降低能耗达57.0%。
[Abstract]:Because of the advantages of compact structure and easy to drive multiple actuators in parallel, valve-controlled hydraulic cylinder system is widely used in industrial and engineering automation equipment. The existing problems are large throttling loss and low energy efficiency. In order to reduce the energy consumption of hydraulic system, valve-controlled hydraulic cylinder system is widely used in industrial and engineering automation equipment. The effective method is to use direct pump control technology to eliminate throttling loss, but the traditional hydraulic pump with symmetrical inlet and outlet flow rate drives asymmetric hydraulic cylinder system, which needs complicated circuit to compensate the area difference of asymmetric hydraulic cylinder. And when the load direction of the hydraulic cylinder changes frequently, the control cavity alternates and the cylinder runs smoothly. In view of the above problems, a closed system scheme of the asymmetric pump control cylinder which can match the area difference of the asymmetric hydraulic cylinder is put forward. In order to verify the feasibility of the new scheme, an asymmetric pump-controlled hydraulic excavator hopper test system is constructed on the basis of previous simulation research. The operation and energy efficiency characteristics of the hopper rod after adopting the new scheme are studied. The test results show that the new system has good control characteristics and can eliminate the velocity fluctuation caused by the change of load direction. Compared with the independent control system of compound inlet and outlet of pump valve, the energy consumption of one working cycle is reduced to 57.0.
【作者单位】：太原理工大学新型传感器及智能教育部实验室;
【基金】：国家自然科学基金(51575374) NSFC-山西煤基低碳联合基金(U1510206) 国家科技支撑计划(2014BAF08B06)资助项目
【分类号】：TH137;TU621

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