中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (10): 23-31.doi: 10.16265/j.cnki.issn1003-3033.2021.10.004

• 安全工程技术 • 上一篇    下一篇

液压支架抗冲击双级安全阀参数耦合特性研究*

王慧1 教授, 周国强**1, 宋宇宁2, 赵国超1   

  1. 1 辽宁工程技术大学 机械工程学院,辽宁 阜新 123000;
    2 营口理工学院 机械与动力工程系,辽宁 营口 115000
  • 收稿日期:2021-07-17 修回日期:2021-09-11 出版日期:2021-10-28 发布日期:2022-04-28
  • 通讯作者: ** 周国强(1996—),男,辽宁铁岭人,博士研究生,研究方向为机械设计及理论。E-mail:ZGQ7618@163.com。
  • 作者简介:王 慧 (1960—),男,辽宁凌源人,博士,教授,博士生导师,主要从事煤矿井下液压支架无件及特性等方面的研究。E-mail:wanghui9955@163.com。
  • 基金资助:
    国家自然科学基金资助(51574140)。

Study on parametric coupling characteristics of anti-impact two-stage safety valve for hydraulic supports

WANG Hui1, ZHOU Guoqiang1, SONG yuning2, ZHAO Guochao1   

  1. 1 School of Mechanical Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;
    2 Department of Mechanical and Power Engineering, Yingkou Institute of Technology, Yingkou Liaoning 115000, China
  • Received:2021-07-17 Revised:2021-09-11 Online:2021-10-28 Published:2022-04-28

摘要: 安全阀是液压支架的重要保护元件,为提高液压支架的抗冲击性能,首先提出一种额定压力为50 MPa、流量为1 000 L/min的液压支架双级安全阀,建立双级安全阀的数学模型;然后通过Matlab数值仿真模拟研究二级进口横截面积、二级差动面积、外弹簧刚度、外弹簧预压缩量等耦合作用对双级安全阀动态特性的影响,获得最佳匹配参数;最后搭建动载冲击试验台,试验验证其动态特性。研究结果表明:二级差动面积减小、外弹簧刚度增大,双级安全阀的压力超调量、压力稳定时间和卸荷时间均减小,最佳匹配参数是二级差动面积为863 mm2和外弹簧刚度为119 286 N/m,试验获得双级安全阀的压力、流量稳定值分别为49.2 MPa、1 050 L/min,卸荷时间为0.02 s,仿真模拟结果与试验结果基本一致。

关键词: 液压支架, 双级安全阀, 参数耦合, 动态特性, 冲击试验

Abstract: As safety valve is an important protection component of hydraulic supports, in order to improve impact resistance of the latter, a two-stage safety valve with a rated pressure of 50 MPa and a flow of 1 000 L/min was proposed, before a mathematical model of the valve was established. Then, coupling effects of structural parameters, such as cross-sectional area of secondary inlet, secondary differential area, stiffness and pre-compression of external spring and others, on the valve's dynamic characteristics were studied through Matlab numerical simulation, and the best matching parameters were obtained. Finally, a dynamic impact test platform was established to test and verify its dynamic features. The results show that when two-stage differential area decreases, and outer spring's stiffness increases, the pressure overshoot, pressure stabilization time and unloading time of the two-stage safety valve are all reduced. The best matching parameters come as 863 mm2 for a second-stage differential area and 119 286 N/m for outer spring stiffness, while the pressure and flow stability values are 49.2 MPa and 1 050 L/min, respectively, and the unloading time is 0.02 s. Moreover, simulation and test results are generally consistent.

Key words: hydraulic support, two-stage safety valve, parameter coupling, dynamic characteristics, impact test

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