Study on the fast fluid supply and return scheme of hydraulic support column in fully mechanized working face
-
摘要: 液压支架自动跟机控制应具备高支护、快速移架、大推移距离等性能，其中在保障采场安全的前提下，缩短工作面空顶时间是一个极为关键的问题。但目前液压支架自动跟机控制存在动作时间长、较手动操作效率低、控制参数凭经验设定等问题，导致综采工作面推移速度慢、液压系统压力与流量匹配不佳等问题。为减少液压支架动作时间，提高综采工作面推移速度，建立了液压支架阀控缸单元液压缸伸出动作瞬态过程的流量-压力数学模型，分析认为液压缸伸缩瞬间压力主要与供回液压力有关，且与时间呈二次方关系。基于上述结论，提出了立柱供液阀直供、二级控制+立柱快速供液阀、电液控换向阀直供3种立柱快速供回液方案，详细介绍了3种方案的工作原理。在AMESim软件中建立了基于3种方案的液压支架仿真模型，通过分析不同方案下液压支架在执行降柱-移架-升柱循环动作时液压缸无杆腔、有杆腔瞬态压力及动作时间，对比了3种方案的稳定性和快速性，结果表明：3种方案下液压支架执行降柱-移架-升柱循环动作时液压缸无杆腔、有杆腔压力曲线变化趋势基本一致，认为3种方案的稳定性基本相同；电液控换向阀直供方案下液压支架执行降柱-移架-升柱循环动作的总时间最短，为9.35 s，较传统方案缩短22.1%，因此得出电液控换向阀直供方案为最佳方案。Abstract: The hydraulic support automatic follow-up control should have the performance of high support, fast support moving, large moving distance, etc.Among these performance, under the premise of ensuring stope safety, shortening the time of working face empty roof is an extremely critical issue.However, the current hydraulic support automatic follow-up control has problems such as long action time, lower efficiency than manual operation, control parameters set by experience and other problems, resulting in the slow moving speed of the fully mechanized working face, and poor matching of hydraulic system pressure and flow.In order to reduce the action time of the hydraulic support and improve the moving speed of the fully mechanized working face, the flow-pressure mathematical model of the hydraulic support valve-controlled cylinder unit in hydraulic cylinder extension action transient process is established.The analysis shows that the instantaneous pressure of the hydraulic cylinder extension is mainly related to the supply and return hydraulic pressure, and has a quadratic relationship with time.Based on the above conclusions, three schemes for column fast fluid supply and return named direct supply by column liquid supply valve, two-level control + column fast liquid supply valve, and direct supply by electro-hydraulic controlled reversing valve are presented.The working principles of the three schemes are introduced in detail.The simulation models of hydraulic support based on the three schemes are established in AMESim software, and the stability and rapidity of the three schemes are compared by analyzing the transient pressure and action time of the rod cavity and rodless cavity of hydraulic cylinder when the hydraulic support executes the cycle of column lowering-support moving-column lifting under different schemes.The results show that the pressure curves of the rod cavity and rodless cavity of hydraulic cylinder are basically the same when the hydraulic support executes the cycle of column lowering-support moving-column lifting under the three schemes.It is considered that the stability of the three schemes is basically the same.The total time for the hydraulic support to perform the cycle of column lowering-support moving-column lifting under the direct supply by electro-hydraulic controlled reversing valve is the shortest, which is 9.35 s and is 22.1% shorter than the traditional scheme.Therefore, it is concluded that the direct supply scheme by electro-hydraulic controlled reversing valve is the best scheme.
-
-
[1] 李昊.智能化综采工作面液压支架自适应跟机关键技术研究[D].北京:中国矿业大学(北京),2020. LI Hao.Research on the key technology of hydraulic support machine-following adaptive control in intelligent fully mechanized mining face[D].Beijing:China University of Mining and Technology(Beijing),2020. [2] 张霖.液压支架自主跟机关键技术研究[D].徐州:中国矿业大学,2017. ZHANG Lin.Research on key technologies of autonomous following mining machine for hydraulic support[D].Xuzhou:China University of Mining and Technology,2017.
[3] 白永胜,牛剑峰.液压支架电液控制通信网络系统透明化设计[J].煤炭科学技术,2018,46(9):183-187. BAI Yongsheng,NIU Jianfeng.Design of transparency of communication network system for electronic-hydraulic control system of hydraulic support[J].Coal Science and Technology,2018,46(9):183-187.
[4] WANG Guofa,PANG Yihui.Surrounding rock control theory and longwall mining technology innovation[J].International Journal of Coal Science & Technology,2017,4(4):301-309.
[5] 王国法,范京道,徐亚军,等.煤炭智能化开采关键技术创新进展与展望[J].工矿自动化,2018,44(2):5-12. WANG Guofa,FAN Jingdao,XU Yajun,et al.Innovation progress and prospect on key technologies of intelligent coal mining[J].Industry and Mine Automation,2018,44(2):5-12.
[6] 王国法,杜毅博.智慧煤矿与智能化开采技术的发展方向[J].煤炭科学技术,2019,47(1):1-10. WANG Guofa,DU Yibo.Development direction of intelligent coal mine and intelligent mining technology[J].Coal Science and Technology,2019,47(1):1-10.
[7] 王国法,刘峰,孟祥军,等.煤矿智能化(初级阶段)研究与实践[J].煤炭科学技术,2019,47(8):1-36. WANG Guofa,LIU Feng,MENG Xiangjun,et al.Research and practice on intelligent coal mine construction(primary stage)[J].Coal Science and Technology,2019,47(8):1-36.
[8] 殷英.大流量电液换向阀的动态特性及流场特性仿真[D].太原:太原理工大学,2016. YIN Ying.Simulation on dynamic and flow field characteristics of large flow electro-hydraulic directional valve[D].Taiyuan:Taiyuan University of Technology,2016. [9] 李骏,林福严.跟机自动化中采煤机自动控制方法研究[J].工矿自动化,2014,40(2):1-4. LI Jun,LIN Fuyan.Research of automatic control method of shearer in machinery-tracked automation[J].Industry and Mine Automation,2014,40(2):1-4.
[10] 于玲,贾春强.综采工作面支架液压系统仿真研究[J].煤矿机械,2014,35(2):56-58. YU Ling,JIA Chunqiang.Simulation research on hydraulic system of powered support in fully mechanized face[J].Coal Mine Machinery,2014,35(2):56-58.
[11] 刘宝龙.液压支架推移装置参数优化与移架速度研究[D].太原:太原理工大学,2010. LIU Baolong.Research on advancing velocity and parameter optimization of passage device of hydraulic support[D].Taiyuan: Taiyuan University of Technology,2010.
[12] 黄蕾.大采高液压支架快速移架与姿态控制研究[D].太原:太原科技大学,2017. HUANG Lei.Research on rapid transplanting and attitude control of large mining height hydraulic support[D].Taiyuan:Taiyuan University of Science and Technology,2017.
[13] 周如林,李首滨,韦文术,等.跟机液压系统压力流量耦合机理研究[J].煤炭科学技术,2020,48(5):129-136. ZHOU Rulin,LI Shoubin,WEI Wenshu,et al.Study on coupling mechanism of pressure and flow in following hydraulic system of mining face[J].Coal Science and Technology,2020,48(5):129-136.
[14] 吴根茂,邱敏秀,王庆丰,等.新编实用电液比例技术[M].杭州:浙江大学出版社,2010. WU Genmao,QIU Minxiu,WANG Qingfeng,et al.Newly-compiled practical electricity proportion technology[M].Hangzhou:Zhejiang University Press,2010. -
期刊类型引用(0)
其他类型引用(4)
计量
- 文章访问数: 145
- HTML全文浏览量: 11
- PDF下载量: 23
- 被引次数: 4
下载:
