不同攻击角下镐型截齿线性切削破岩特性  

Linear cutting rock-breaking characteristics of conical pick at various attack angles

作　　者：石鑫垒 KAPEND Yav Jonathan 王少锋[1] SHI Xinlei;KAPEND Yav Jonathan;WANG Shaofeng(School of Resources and Safety Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源与安全工程学院,长沙410083

出　　处：《有色金属（矿山部分）》2024年第6期133-140,共8页NONFERROUS METALS(Mining Section)

基　　金：国家自然科学基金项目(52474168,52174099);湖南省自然科学基金项目(2021JJ30842)。

摘　　要：深入探讨不同攻击角下镐型截齿线性切削破岩特性,以期优化截齿参数设计,提升破岩效率,降低能耗。构建镐型截齿破岩MatDEM数值模型,开展不同攻击角下线性切削破岩数值模拟,获得截齿力、裂纹扩展模式以及破岩效率等关键参数。结果显示,截齿平均切削力、法向力均表现出随着截齿攻击角度增加而增大;岩石破坏模式随着截齿攻击角的增加由张拉破坏为主转变为压剪破坏为主;在切削深度为12 mm时,岩石破碎效率的最优攻角为40°,在切削深度为15 mm时,岩石破碎效率的最优攻角在55°~60°。不同的攻击角会导致截齿与岩石之间产生不同的破坏模式,进而影响破岩过程中的能量转换与效率。本文研究结论可为镐型截齿的结构参数优化设计提供参考依据,提高悬臂式掘进机的采掘效率。To thoroughly investigate the rock-breaking characteristics of conical pick under various attack angles in linear cutting,aiming to optimize conical pick parameters,enhance rock-breaking efficiency,and reduce energy consumption.Constructing matDEM numerical model for rock breaking by conical pick,a series of linear cutting numerical simulations were designed based on varying attack angles,to obtain key parameters such as conical pick force,crack propagation patterns and cutting efficiency.The results show that the average cutting force and the normal force of the conical pick increased with the increase of the attack angle of the conical pick.The main mode of rock failure changed from tensile failure to shear failure with the increase of the attack angle.The optimal attack angle for rock fragmentation efficiency was 40°at a cutting depth of 12 mm,and it was between 55°-60°at a cutting depth of 15 mm.Different attack angles lead to distinct failure modes between the conical pick and the rock,thus affecting the energy conversion and efficiency during the rock-breaking process.The conclusions of this study can provide a reference basis for the optimization of structural parameters in conical pick design,thereby enhancing the mining efficiency of cantilever roadheaders.

关 键 词：镐型截齿 切削力 法向力 攻击角 裂纹扩展 破岩比能 

分 类 号：TD421.5[矿业工程—矿山机电]