刨煤机煤岩刨削破碎数值模拟研究
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摘要
为研究刨煤机刨刀刨削煤岩的破碎过程及其影响因素,采用数值模拟方法对刨削过程进行分析,鉴于煤岩为非均匀介质,对煤岩图像进行识别,采用图像重构方法建立煤岩三维模型,增加了模拟的准确性,为有限元的非均匀物质三维建模提供新的理论和方法,得到更准确的模拟仿真数据。通过模拟不同工况下刨刀的破煤过程,得到刨刀与模拟煤壁的接触力。研究结果表明:随着刨削深度的增加,刨刀受力增加,受力逐渐趋于稳定,但由于煤质的变化,力在一个稳定值附近上下波动;刨削速度对刨刀载荷的影响不大;煤岩坚固性系数越大,刨刀模拟载荷越大。
In order to study the crushing process and its influencing factors of the coal rock ploughing and planing by the plough cutters,the planing process is analyzed by numerical simulation, in view of the fact that coal and rock are heterogeneous media, coal rock images are identified, the three-dimensional model of coal rock is established by image reconstruction method, the accuracy of simulation is increased, it provides a new theory and method for three-dimensional finite element modeling of heterogeneous materials, and obtains more accurate simulation data. Through the simulation of coal crushing process under different conditions of plow bit,get contact force plow bit and simulation of coal wall. The results show that:with the increase of planing depth, plow bit stress force increase, the stress gradually stabilized,but because of the change of the coal quality, the forces fluctuate up and down near a steady value;planing speed has little effect on the plane load;coal rock firmness coefficient is larger,the greater the load simulation tool.
In order to study the crushing process and its influencing factors of the coal rock ploughing and planing by the plough cutters,the planing process is analyzed by numerical simulation, in view of the fact that coal and rock are heterogeneous media, coal rock images are identified, the three-dimensional model of coal rock is established by image reconstruction method, the accuracy of simulation is increased, it provides a new theory and method for three-dimensional finite element modeling of heterogeneous materials, and obtains more accurate simulation data. Through the simulation of coal crushing process under different conditions of plow bit,get contact force plow bit and simulation of coal wall. The results show that:with the increase of planing depth, plow bit stress force increase, the stress gradually stabilized,but because of the change of the coal quality, the forces fluctuate up and down near a steady value;planing speed has little effect on the plane load;coal rock firmness coefficient is larger,the greater the load simulation tool.
引文
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[2] 郝志勇.刨煤机刨刀刨削煤岩力学特性研究及其优化设计[D].阜新:辽宁工程技术大学.2014:1-2.HAO ZhiYong.Plow bit planing on mechanical properties of coal and its optimization design [D].Fuxin:Liaoning Technical University.2014:1-2(In Chinese).
[3] 毛君,张瑜,宋秋爽,等.斜切工况下刨煤机动态特性研究及运行参数优化设计[J].机械强度,2017,39(03):500-504.MAO Jun,ZHANG Yu,SONG QiuShuang,et al.Dynamic characteristics of plough head under contact-impact with clearances[J].Journal of Mechanical Strength,2017,39(03):500-504 (In Chinese).
[4] 赵丽娟,何景强,李发泉,等.刨煤机刨刀破煤过程的数值模拟[J].煤炭学报.2012,37(5):878-883.ZHAO LiJuan,HE JingQiang,LI FaQuan,et al.Numerical value of coal blasting processSimulation [J].Journal of China Coal Society.2012,37 (5):878-883(In Chinese).
[5] 赵丽娟,陈磊,田震.刨煤机不同位置刨刀的载荷模拟研究及其强度验证[J].机械强度,2017,39(1):79-84.ZHAO LiJuan,CHEN Lei,TIAN Zhen.Study on loadsimulation and strength verification of planer with different position [J].Journal of Mechanical Strength,2017,39 (1):79-84(In Chinese).
[6] 张玉舜.煤岩破碎分级与破岩效率数值仿真分析[D].青岛:中国石油大学(华东),2013:69-71.ZHANG YuShun.Numerical simulation analysis of coal rock classification and rock breaking efficiency[D].Qingdao:China University of Petroleum,2013:69-71.(In Chinese).
[7] 付伟丽.滑行式刨煤机刨头随机刨削载荷谱研究[D].阜新:辽宁工程技术大学.2011:10-12.FU WeiLi.Research on random load spectrum of planing head of sliding plow [D].Fuxin:Liaoning Technical University,2011:10-12(In Chinese).
[8] 郭辰光,李源,胡迪,等.刨刀刨削煤岩特性数值模拟研究[J].煤炭科学技术.2017,45(2):141-145.GUO ChenGuang,LI Yuan,HU Di,et al.Numericalsimulation of rock and roll characteristics of planer [J].Coal Science and Technology.2017,45 (2):141-145(In Chinese).
[9] Hudson J P,Harrison.Engineering rock mechanics:an introduction to the principles and applications[M].Nederland:Elsevier Science,1997:3-4.
[10] Evans.Basic Mechanics of the Point Attack Pick[J].Colliery Guardian,1984,109(2):11-15.
[11] Ulrich Paschedag.Advanced plow systems,considers longwall mining of medium and thin seams[J].Glückauf,2005(7):6-8.