基于离散元技术的胶带端部采样器设计参数优化
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摘要
基于离散元仿真技术对输煤胶带端部的采样运动参数进行研究。通过改变端部采样切割斗在4×30个直径为50 mm颗粒料流模型中的运动速度,研究收集的颗粒粒子种类和数量。结果显示,随着切割斗运动速度从1 m/s升到2 m/s,收集的颗粒总数从2 006个降至958个,相当于胶带中部采样宽度从835 mm降至399 mm。将横截面为4×30个颗粒的料流水平分为30种颗粒的模型中,采样斗收集颗粒的标准差与切割速度无关,在切割速度1. 5 m/s时标准差最大,为3. 69,切割速度为1 m/s时标准差最小,为2. 43;将横截面为4×30个颗粒的料流垂直分为4种颗粒的模型,采样斗收集颗粒的标准差与切割速度呈弱线性相关,切割速度1 m/s时的标准差最大,为84. 98,切割速度1. 7m/s时的标准差最小,为53. 19。不同切割速度下,切割斗对远端和底层的采集效果较差,在设计中应向胶带方向加大采样斗进料口长度,提高对底层煤粒的收集效果。
Based on the discrete element simulation technology,the sampling motion parameters at the end of coal conveying belt were studied.By changing the moving speed of the end sampling and cutting bucket in the material flow model of 50 mm diameter particles with cross section of 4×30,the kinds and quantities of particles collected were counted.The results show that with the increase of the moving speed of the cutting bucket from 1 m/s to 2 m/s,the total number of particles collected decreased from 2 006 to 958,which is equivalent to the sampling width of 835 mm to 399 mm in the middle of the belt.In the model of dividing 4×30 material flow into 30 kinds of particles horizontally,there is no correlation between the standard deviation of particles collected by sampling bucket and cutting speed.The standard deviation of particles collected by sampling bucket is the largest at cutting speed of 1.5 m/s,which is 3.69,and the smallest at cutting speed of1 m/s,which is 2.43.In the model of dividing 4×30 material flow vertically into 4 kinds of particles,the standard deviation of particles collected by sampling bucket is weakly linear with cutting speed.The maximum standard deviation is 84.98 at cutting speed of 1 m/s and 53.19 at cutting speed of 1.7 m/s.The results show that the effect of the primary sampler at the end of belt on the end of sampling direction and the bottom is not ideal at different cutting speed.In the design,the length of the inlet and outlet of sampling hopper should be increased in the direction of belt to improve the effect of collecting coal particles at the bottom.
Based on the discrete element simulation technology,the sampling motion parameters at the end of coal conveying belt were studied.By changing the moving speed of the end sampling and cutting bucket in the material flow model of 50 mm diameter particles with cross section of 4×30,the kinds and quantities of particles collected were counted.The results show that with the increase of the moving speed of the cutting bucket from 1 m/s to 2 m/s,the total number of particles collected decreased from 2 006 to 958,which is equivalent to the sampling width of 835 mm to 399 mm in the middle of the belt.In the model of dividing 4×30 material flow into 30 kinds of particles horizontally,there is no correlation between the standard deviation of particles collected by sampling bucket and cutting speed.The standard deviation of particles collected by sampling bucket is the largest at cutting speed of 1.5 m/s,which is 3.69,and the smallest at cutting speed of1 m/s,which is 2.43.In the model of dividing 4×30 material flow vertically into 4 kinds of particles,the standard deviation of particles collected by sampling bucket is weakly linear with cutting speed.The maximum standard deviation is 84.98 at cutting speed of 1 m/s and 53.19 at cutting speed of 1.7 m/s.The results show that the effect of the primary sampler at the end of belt on the end of sampling direction and the bottom is not ideal at different cutting speed.In the design,the length of the inlet and outlet of sampling hopper should be increased in the direction of belt to improve the effect of collecting coal particles at the bottom.
引文
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[13]王阳阳.基于离散元的旋转缩分器仿真方法研究[J].煤矿机械,2015,36(11):80-81.WANG Yangyang.Research of spinning split device based on discrete element method[J]. Coal Mine Machinery,2015,36(11):80-81.
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[15]毛君,刘歆妍,陈洪月,等.基于EDEM的采煤机滚筒工作性能的仿真研究[J].煤炭学报,2017,42(4):1069-1077.MAO Jun,LIU Xinyan,CHEN Hongyue,et al.Simulation research of shearer drum cutting performance based on EDEM[J].Journal of China Coal Society,2017,42(4):1069-1077.
[16]徐婵,王义亮,谢嘉成,等.离散元方法在滚筒采煤机装煤仿真中的应用[J].计算机辅助工程,2017,26(1):70-74.XU Chan,WANG Yiliang,XIE Jiacheng,et al.Application of discrete element method in coal-loading simulation of drum shearer[J].Computer Aided Engineering,2017,26(1):70-74.
[17]包建华,王阳阳,张悦.基于离散元的双滚筒采煤机截割过程仿真分析[J].煤矿机械,2018,39(7):60-62.BAO Jianhua,WANG Yangyang,ZHANG Yue.Simulation analysis of working process for double drum-type shearer via discrete element method[J].Coal Mine Machinery,2018,39(7):60-62.
[2]郑雪纬.国内部分港口铁矿石采样工艺及设备现状综述[J].港工技术,2008(3):9-12.ZHENG Xuewei.Discussions on present status of iron ore sampling equipment in ports of China[J]. Port Engineering Technology,2008(3):9-12.
[3]孙刚,方全国,郑凤轩,等.煤炭采样重要理论问题的分析[J].煤炭学报,2013,38(7):1283-1286.SUN Gang,FANG Quanguo,ZHENG Fengxuan,et al. Analysis of main theoretical problems on coal sampling[J].Journal of China Coal Society,2013,38(7):1283-1286.
[4]刘金国.宽胶带大流量移动煤流自动化采制样技术[J].煤炭学报,2008,33(6):690-693.LIU Jinguo. Automatic sampling technology in wide belt conveyor with big volume of coal flow[J]. Journal of China Coal Society,2008,33(6):690-693.
[5]姚元书.胶带端部采制样系统研制的可行性分析[J].煤质技术,2015(1):34-36.YAO Yuanshu.Feasibility analysis of the research of belt end sampling system[J].Coal Quality Technology,2015(1):34-36.
[6]姚元书.胶带端部采制样技术研究[J].煤质技术,2015(2):16-18,30.YAO Yuanshu. Technological research on sampling and sample preparation on belt end[J]. Coal Quality Technology,2015(2):16-18,30.
[7]王国强,郝万军,王继新.离散单元法及其在EDEM上的实践[M].西安:西北工业大学出版社,2010.
[8]蒋金泉,曲华,谭云亮.综放顶煤放出规律与放煤步距的离散元仿真研究[J].岩石力学与工程学报,2004,23(18):3070-3075.JIANG Jinquan,QU Hua,TAN Yunliang. Numerical simulation by distinct element code on drawing law and interval of fully-mechanized coal mining with caving method[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(18):3070-3075.
[9]谢广祥,黄金桥.顶煤放出规律计算机可视化仿真[J].煤炭学报,2002,27(3):264-267.XIE Guangxiang,HUANG Jinqiao. Computer visualization simulation of top coal drainage law[J]. Journal of China Coal Society,2002,27(3):264-267.
[10]武建文.急倾斜水平分段放顶煤顶煤放出规律研究[D].西安:西安科技大学,2006.
[11]李洪昌,李耀明,唐忠,等.基于EDEM的振动筛分数值模拟与分析[J].农业工程学报,2011,27(5):117-121.LI Hongchang,LI Yaoming,TANG Zhong,et al. Numerical simulation and analysis of vibration screening based on EDEM[J].Transactions of the CSAE,2011,27(5):117-121.
[12]沈宏明.基于EDEM的煤炭采制样初采器仿真模拟与分析[J].煤质技术,2015(2):28-30.SHEN Hongming.Numerical simulation and analysis of coal sampler via EDEM[J].Coal Quality Technology,2015(2):28-30.
[13]王阳阳.基于离散元的旋转缩分器仿真方法研究[J].煤矿机械,2015,36(11):80-81.WANG Yangyang.Research of spinning split device based on discrete element method[J]. Coal Mine Machinery,2015,36(11):80-81.
[14]曲芳,沈斌,赵丽坤.基于EDEM的井下挖掘装载一体机主车体设计研究[J].工业仪表与自动化装置,2016(4):13-17.QU Fang,SHEN Bin,ZHAO Likun.Design and research of underground mining loader's main body based on EDEM[J].Industrial Instrumentation&Automation,2016(4):13-17.
[15]毛君,刘歆妍,陈洪月,等.基于EDEM的采煤机滚筒工作性能的仿真研究[J].煤炭学报,2017,42(4):1069-1077.MAO Jun,LIU Xinyan,CHEN Hongyue,et al.Simulation research of shearer drum cutting performance based on EDEM[J].Journal of China Coal Society,2017,42(4):1069-1077.
[16]徐婵,王义亮,谢嘉成,等.离散元方法在滚筒采煤机装煤仿真中的应用[J].计算机辅助工程,2017,26(1):70-74.XU Chan,WANG Yiliang,XIE Jiacheng,et al.Application of discrete element method in coal-loading simulation of drum shearer[J].Computer Aided Engineering,2017,26(1):70-74.
[17]包建华,王阳阳,张悦.基于离散元的双滚筒采煤机截割过程仿真分析[J].煤矿机械,2018,39(7):60-62.BAO Jianhua,WANG Yangyang,ZHANG Yue.Simulation analysis of working process for double drum-type shearer via discrete element method[J].Coal Mine Machinery,2018,39(7):60-62.
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