• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (20): 213-219.doi: 10.3901/JME.2018.20.213

• 工程车辆 • 上一篇    下一篇

液电混合驱动液压挖掘机动臂特性及能效研究

李泽鹏, 权龙, 葛磊, 夏连鹏, 郝云晓   

  1. 太原理工大学新型传感器与智能控制教育部和山西省重点实验室 太原 030024
  • 收稿日期:2018-03-20 修回日期:2018-08-30 出版日期:2018-10-20 发布日期:2018-10-20
  • 通讯作者: 权龙(通信作者),男,1959年出生,博士,教授,博士研究生导师。主要研究方向为电液伺服及比例控制技术。E-mail:quanlong@tyut.edu.cn
  • 作者简介:李泽鹏,男,1993年出生,博士研究生。主要研究方向为工程机械液压系统节能控制振动控制。E-mail:tyutlizepeng@qq.com
  • 基金资助:
    国家自然科学基金(51875385U1510206)和中德国际科技合作(2015DFA70210)资助项目。

Research on Characteristics and Energy Efficiency of Hydraulic-electric Combined Driving Hydraulic Excavator Boom

LI Zepeng, QUAN Long, GE Lei, XIA Lianpeng, HAO Yunxiao   

  1. Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024
  • Received:2018-03-20 Revised:2018-08-30 Online:2018-10-20 Published:2018-10-20

摘要: 液压挖掘机作业时,动臂频繁升降,举升过程中工作装置集聚的大容量重力势能,在下降时经控制阀转换为热能耗散掉,不仅造成非常大的能量损失,也使油液温度快速升高,需附加额外的冷却装置进行散热,油温的升高也常常引发液压系统故障。为此,提出电动缸为主、液压缸-蓄能器组合为辅的液电混合动臂驱动解决方案。动臂下降时,工作装置的重力势能转化为液压能存储在蓄能器中;动臂举升时,存储在蓄能器的液压能驱动液压缸辅助电动缸驱动动臂,电动缸仅需驱动惯性载荷和物料重力。在研究中,建立了液电混合驱动动臂的试验样机,对其运行特性和能效特性进行了试验测试。结果表明,较无重力势能回收的进出口独立控制系统,相同工况下,液电混合驱动方式降低能耗达72.7%,显著提升了挖掘机动臂举升系统的能量效率。

关键词: 电动缸, 节能, 液电混合驱动, 液压挖掘机

Abstract: When the hydraulic excavator works, its boom lifts and lowers frequently. During the lowering process, a large amount of working device's gravitational potential energy accumulated during the lifting process is converted into heat energy and dissipated through the control valve. That not only causes large energy loss, but also causes the oil temperature to rise rapidly. The temperature rising of the oil often causes hydraulic system failure and additional cooling equipment is required for heat dissipation. To solve the above issues, a hydraulic-electric combined driving scheme for boom is proposed. In the scheme, electric cylinder is set as main driving unit and hydraulic cylinder-accumulator combination is set as auxiliary driving unit. When the boom lowers, the gravitational potential energy of the working device is converted into the hydraulic energy and stored in the accumulator. When the boom lifts, the hydraulic energy stored in the accumulator can be directly used to drive the hydraulic cylinder to assist to drive the boom, and the electric cylinder only needs to drive the inertial load and the load of goods. In this paper, a test prototype of the hydraulic-electric combined driving system was established, and the operating characteristics and energy efficiency of the system were tested. The test results show that, compared with the independent meter-in and meter-out control system without potential energy recovery function, the hydraulic-electric combined driving system reduces the energy consumption by 72.7% under the same working conditions and the energy efficiency of excavator boom system is significantly improved.

Key words: electric cylinder, energy saving, hydraulic excavator, hydraulic-electric combined driving

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