刮板输送机中部槽冲击特性研究
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摘要
为了研究煤料、刮板及刮板链对刮板输送机中部槽的冲击特性,首先基于赫兹接触理论,对煤料冲击中部槽过程中的法向冲击载荷和冲击能量进行了理论分析;然后采用EDEM仿真软件模拟了采煤工况下煤料对中部槽的冲击过程,得到了不同链速、不同采煤高度下中部槽所受的法向冲击载荷曲线,以及中部槽中板所受的冲击力分布;最后在空载工况下对刮板及刮板链对中部槽中板的冲击载荷进行了现场试验。研究结果表明:在不同链速和采煤高度下,煤料对刮板输送机中部槽的法向冲击载荷均先迅速增大,然后减小至一定区间内波动,且法向冲击载荷随链速和采煤高度的增大而增大;煤料对中部槽中板的冲击力主要集中在两链道处;刮板及刮板链对中部槽的冲击载荷呈周期性阶跃变化,且采煤侧链道处、采空侧链道处、非链道处的冲击载荷依次减小。
In order to research impact characteristics of coal materials,scraper and scraper chain on middle trough of scraper conveyor,normal impact load and impact energy during process of coal materials impacting on middle trough were theoretically analyzed firstly based on Hertz contact theory.Then impact process of coal materials on middle trough under mining condition was simulated by use of EDEM simulation software,and curves of normal impact loads on middle trough under different chain speeds and different mining heights were obtained as well as impact force distribution on mid-plate of middle trough.Finally,impact loads of scraper and scraper chain on the mid-plate were tested in the field under no-load condition.The research results show that under different chain speeds and mining heights,normal impact loads of coal materials on middle trough increase rapidly at first,then decrease to a certain range of fluctuation,which increase with the increase of chain speed or mining height.Impact force of coal materials on the mid-plate mainly concentrates in two chain parts.Impact loads of scraper and scraper chain on the mid-plate show periodical step change,and impact loads at mining side chain,goaf side chain and non-chain decrease in turn.
In order to research impact characteristics of coal materials,scraper and scraper chain on middle trough of scraper conveyor,normal impact load and impact energy during process of coal materials impacting on middle trough were theoretically analyzed firstly based on Hertz contact theory.Then impact process of coal materials on middle trough under mining condition was simulated by use of EDEM simulation software,and curves of normal impact loads on middle trough under different chain speeds and different mining heights were obtained as well as impact force distribution on mid-plate of middle trough.Finally,impact loads of scraper and scraper chain on the mid-plate were tested in the field under no-load condition.The research results show that under different chain speeds and mining heights,normal impact loads of coal materials on middle trough increase rapidly at first,then decrease to a certain range of fluctuation,which increase with the increase of chain speed or mining height.Impact force of coal materials on the mid-plate mainly concentrates in two chain parts.Impact loads of scraper and scraper chain on the mid-plate show periodical step change,and impact loads at mining side chain,goaf side chain and non-chain decrease in turn.
引文
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[4]蔡柳,王学文,李博,等.刮板输送机中部槽运输效率及其运输过程中的应力和变形分析[J].机械设计与制造,2016(12):172-176.CAI Liu,WANG Xuewen,LI Bo,et al.Analysis on conveying efficiency and stress and deformation of middle pan during conveying process[J].Machinery Design&Manufacture,2016(12):172-176.
[5]高俊峰.刮板输送机中部槽失效原因及耐磨堆焊技术研究[J].煤矿现代化,2018(6):195-197.GAO Junfeng.Failure reason of middle groove of mine scraper machine and research on wear-resisting surfacing welding technology[J].Coal Mine Modernization,2018(6):195-197.
[6]张东升,于海洋,蒋家宁,等.刮板输送机中部槽连接体系力学分析与仿真研究[J].机械强度,2018,40(2):477-482.ZHANG Dongsheng,YU Haiyang,JIANG Jianing,et al.Machanical analysis and simulation study on the middle groove connection system of scraper conveyor[J].Journal of Mechanical Strength,2018,40(2):477-482.
[7]王胜男,仲花维,张健.基于MSC.Nastran的重型刮板输送机中部槽强度分析[J].煤炭工程,2013,45(增刊2):120-121.
[8]郝勇,于鸿斐,刘征,等.刮板输送机中部槽力学计算与分析[J].煤炭科学技术,2014,42(11):67-72.HAO Yong,YU Hongfei,LIU Zheng,et al.Mechanics calculation and analysis on middle pan of scraper conveyor[J].Coal Science and Technology,2014,42(11):67-72.
[9]季顺迎,樊利芳,梁绍敏.基于离散元方法的颗粒材料缓冲性能及影响因素分析[J].物理学报,2016,65(10):168-180.JI Shunying,FAN Lifang,LIANG Shaomin.Buffer capacity of granular materials and its influencing factors based on discrete element method[J].Acta Physica Sinica,2016,65(10):168-180.
[10]黄鹏鹏,李成,胡明亮.基于响应曲面法与离散元法的破碎过程能耗仿真分析[J].机械设计与制造,2016(10):78-82.HUANG Pengpeng,LI Cheng,HU Mingliang.Simulation and analysis on process of crushing energy consumption based on the response surface methodology and discrete element method[J].Machinery Design&Manufacture,2016(10):78-82.
[11]杨茗予.刮板输送机中部槽内散体负载动态特性研究[D].太原:太原理工大学,2017.
[12]梁绍伟.散煤料对中部槽冲击与摩擦作用的研究[D].太原:太原理工大学,2017.