基于DEM的矿用滚轴筛优化设计研究.pdf

工程硕士专业学位论文 基于 DEM 的矿用滚轴筛优化设计研究 Optimal Design of Mining Roller Screen Based on DEM 作者余涛宏 导师赵啦啦 副教授 中国矿业大学 二〇一九年十一月 万方数据 学位论文使用授权声明学位论文使用授权声明 本人完全了解中国矿业大学有关保留、使用学位论文的规定，同意本人所撰 写的学位论文的使用授权按照学校的管理规定处理 作为申请学位的条件之一， 学位论文著作权拥有者须授权所在学校拥有学位 论文的部分使用权，即①学校档案馆和图书馆有权保留学位论文的纸质版和电 子版，可以使用影印、缩印或扫描等复制手段保存和汇编学位论文；②为教学和 科研目的，学校档案馆和图书馆可以将公开的学位论文作为资料在档案馆、图书 馆等场所或在校园网上供校内师生阅读、浏览。另外，根据有关法规，同意中国 国家图书馆保存研究生学位论文。 （保密的学位论文在解密后适用本授权书） 。 作者签名 导师签名 年 月 日 年 月 日 万方数据 中图分类号 TD452 学校代码 10290 UDC 621 密 级 公开 中国矿业大学 工程硕士专业学位论文 基于 DEM 的矿用滚轴筛优化设计研究 Optimal Design of Mining Roller Screen Based on DEM 作 者 余涛宏 导 师 赵啦啦 副教授 申请学位 工程硕士专业学位 培养单位 机电工程学院 学科专业 机械工程 研究方向 筛分设备及理论 答辩委员会主席 王洪欣 评 阅 人 赵永志、江海深 二○一九年十一月 万方数据 致致 谢谢 光阴荏苒，不知不觉两年多时光过去了，我也即将离开母校，怀揣梦想去闯 出一番新天地。 在此论文完成之际，我衷心地感谢我的导师赵啦啦副教授，是赵老师陪着我 走完了这一段路程，尽管路上有许多坎坷，但赵老师都鼓励着我勇敢地将困难克 服。赵老师诲人不倦、舍己为人的品质深深地打动了我，是我学习的榜样。赵老 师在滚轴筛的建模、筛分过程的模拟、数据的处理分析和论文的写作与修改等方 面都给予了我很大的帮助。再次对赵老师悉心的指导表示由衷的感谢 感谢曹海岗硕士、施韬硕士、赵金凯硕士在滚轴筛的三维建模、模拟参数设 置和数据处理等方面提供的帮助。 感谢与我一同度过这美好的两年多时光的师兄、师姐、师弟、师妹们，大家 的互相勉励、团结互助是我前进的不竭动力。 感谢新疆天池能源有限责任公司对本课题的资助， 为本课题的顺利完成提供 了有力支持。 感谢我的父母和亲人，是他们一直以来的嘘寒问暖、理解和支持支撑着我完 成了这篇学位论文。 最后，向在百忙之中评阅本论文的各位专家表示诚挚的谢意。 万方数据 I 摘摘 要要 滚轴筛是一种无振动、处理量大、结构简单的筛分设备，在千万吨级大型煤 炭生产企业中具有广泛的应用前景， 对滚轴筛进行优化设计具有重要的工程实际 意义。因此，本文基于 DEM（discrete element ）对滚轴筛的筛分过程进行 了数值模拟，所得结果可为滚轴筛的优化设计提供参考。主要研究成果如下 开展了直线筛面滚轴筛的筛分过程 DEM 模拟研究，分析了筛轴转速、筛面 倾角和黏附能量密度对球形颗粒和非球形颗粒的筛分过程影响规律。结果表明， 筛轴转速对筛分效率的影响略大于筛面倾角， 而筛轴转速和筛面倾角对筛分速度 的影响均不明显。当筛轴转速和筛面倾角分别为 60 r/min 和 6时，筛分效果最 佳，筛分效率和颗粒群运动速度分别为 94.6和 1.45 m/s。黏附能量密度对球形 颗粒的筛分过程无明显的影响， 而非球形颗粒的筛分效率随着黏附能量密度的增 大有所降低。 利用分段筛面实现了滚轴筛的等厚筛分， 模拟研究了 4 组分段式筛面滚轴筛 的筛分过程，并与同条件下的直线筛面滚轴筛进行了比较，探究了颗粒形状、筛 轴转速和黏附能量密度对分段筛面滚轴筛的筛分过程的影响规律。结果表明，当 采用筛面倾角为 0 -3 -6 -9 -12 的五段式筛面，筛轴转速为 60 r/min 时，筛分效 果最佳。颗粒形状和黏附能量密度对筛分速度无明显影响，并且当颗粒形状为非 球形、黏附能量密度较小时，筛分效率较大。 基于 Hertz-Mindlin with Archard Wear 模型和 Relative Wear 模型，研究了渐 开线形盘片的累积接触能量和磨损深度， 分析了盘片滚齿顶端的切向累积接触力 和法向累积接触力， 并比较了渐开线形、 梅花形和三角形盘片滚轴筛的筛分过程， 以及盘片滚齿顶端的磨损深度。结果表明，滚齿顶端的磨损程度最大，且磨损主 要来源于切向接触力。当采用渐开线形盘片时，筛分效果最佳，且滚齿顶端的磨 损深度较小，仅为 1.94 mm。 该论文有图 45 幅，表 28 个，参考文献 142 篇。 关键词关键词滚轴筛；离散元法；数值模拟；优化设计 万方数据 II Abstract Roller screen is a kind of non-vibration, large processing capacity, simple structure screening equipment. It has a wide application prospects in tens of millions of tons of large-scale coal production enterprises. It has important engineering practical significance to optimize the design of roller screen. Therefore, based on DEM discrete element , this paper simulates the screening process of roller screen, and the results can provide some reference for the optimal design of roller screen. The main research results are as follows The DEM simulation of the screening process of roller screen with straight screen surface was carried out. The influence of screening shaft speed, inclination angle of screen surface and adhesion energy density on screening process of spherical and aspherical particles was analyzed. The results show that the influence of screening shaft speed on screening efficiency is slightly greater than that of inclination angle of screen surface, while the influence of screening shaft speed and inclination angle of screen surface on screening speed is not obvious. When screening shaft speed and inclination angle of screen surface are 60 r/min and 6 degrees respectively, the screening effect is the best. The screening efficiency and particle swarm velocity are 94.6 and 1.45 m/s, respectively. Adhesion energy density has no obvious influence on the screening process of spherical particles, but the screening efficiency of aspherical particles decreases with the increase of adhesion energy density. The equal thickness screening of roller screen is realized by using segmented screening surface. The screening process of four groups of roller screen with segmented screening surface is simulated. Compared with the roller screen of straight screening surface under the same conditions. The influence of particle shape, screening shaft speed and adhesion energy density on the screening process of the roller screen with segmented screening surface is explored. The results show that the screening effect is the best when inclination angle of screen surface is 0 -3 -6 -9 -12, and screening shaft speed is 60 r/min. Particle shape and adhesion energy density have little effect on screening speed, and the screening efficiency is higher when particle shape is aspherical and adhesion energy density is small. Based on Hertz-Mindlin with Archard Wear model and Relative Wear model, the cumulative contact energy and wear depth of involute disc were studied, and the tangential cumulative contact force and normal cumulative contact force at the top of 万方数据 III hobbing were analyzed. The screening process of roller screen with involute, plum and triangular discs and the wear depth at the top of hobbing are compared. The results show that the wear degree of hobbing top is the greatest, and the wear mainly comes from tangential contact force. When involute disc is used, the screening effect is the best, and the wear depth of hobbing top is only 1.94 mm. 45 figures, 28 tables and 142 references are included in this work. Keywords Roller screen; Discrete element ; Numerical simulation; Optimal design 万方数据 IV 目目 录录 摘摘 要要.............................................................................................................................. I 目目 录录........................................................................................................................... IV 图清单图清单...................................................................................................................... VIII 表清单表清单...................................................................................................................... XIII 变量注释表变量注释表 ............................................................................................................ XVII 1 绪论绪论............................................................................................................................ 1 1.1 研究背景与意义 .................................................. 1 1.2 滚轴筛设备的发展与应用 .......................................... 2 1.3 筛分过程模拟技术的应用与发展 .................................... 5 1.4 结构可靠性的应用与发展 .......................................... 8 1.5 课题研究内容 ................................................... 12 2 DEMDEM 原理及其在滚轴筛筛分过程中的应用原理及其在滚轴筛筛分过程中的应用 ........................................................... 13 2.1 DEM 的基本原理 ................................................. 13 2.2 滚轴筛的设计 ................................................... 20 2.3 滚轴筛的筛分过程模拟 ........................................... 23 2.4 本章小结 ....................................................... 29 3 滚轴筛筛分过程的影响因素分析滚轴筛筛分过程的影响因素分析 ......................................................................... 30 3.1 转速对滚轴筛筛分过程的影响 ..................................... 30 3.2 筛面倾角对滚轴筛筛分过程的影响 ................................. 34 3.3 黏结颗粒对滚轴筛筛分过程的影响 ................................. 36 3.4 本章小结 ....................................................... 38 4 基于非球形颗粒的滚轴筛筛分过程模拟研究基于非球形颗粒的滚轴筛筛分过程模拟研究 ..................................................... 39 4.1 EDEM 中非球形颗粒模型的建立 .................................... 39 4.2 转速对非球形颗粒筛分过程的影响 ................................. 40 4.3 筛面倾角对非球形颗粒筛分过程的影响 ............................. 42 4.4 黏附能量密度对非球形颗粒筛分过程的影响 ......................... 44 4.5 本章小结 ....................................................... 45 5 分段筛面滚轴筛的筛分过分段筛面滚轴筛的筛分过程模拟研究程模拟研究 ................................................................. 46 5.1 分段筛面的选择 ................................................. 46 万方数据 V 5.2 转速对分段筛面筛分系统的影响 ................................... 49 5.3 黏附能量密度对分段筛面筛分系统的影响 ........................... 51 5.4 本章小结 ....................................................... 53 6 筛轴盘片的磨损分析及其优化筛轴盘片的磨损分析及其优化 ............................................................................. 54 6.1 EDEM 中磨损分析模型的建立 ...................................... 54 6.2 筛轴盘片的磨损分析 ............................................. 55 6.3 盘片形状对滚轴筛筛分过程的影响 ................................. 60 6.4 本章小结 ....................................................... 61 7 结论与展望结论与展望 ............................................................................................................. 62 7.1 结论 ........................................................... 62 7.2 展望 ........................................................... 63 参考文献参考文献 ..................................................................................................................... 64 作者简历作者简历 ..................................................................................................................... 72 学位论文原创性声明学位论文原创性声明 ................................................................................................. 73 学位论文数据集学位论文数据集 ......................................................................................................... 74 万方数据 VI Contents Abstract ........................................................................................................................ II Contents ..................................................................................................................... VI Lists of Figures ....................................................................................................... VIII Lists of Tables ......................................................................................................... XIII Lists of Variables ................................................................................................... XVII 1 Introduction ............................................................................................................... 1 1.1 Background and Significance .................................................................................. 1 1.2 Development and Application of Roller Screen ...................................................... 2 1.3 Application and Development of Screening Process Simulation Technology ......... 5 1.4 Application and Development of Structural Reliability ........................................... 8 1.5 Research Contents .................................................................................................. 12 2 The Principle of DEM and Its Application in the Screening Process of Roller Screen .......................................................................................................................... 13 2.1 The Principle of DEM ............................................................................................ 13 2.2 Design of Roller Screen ......................................................................................... 20 2.3 Simulation of Screening Process of Roller Screen ................................................ 23 2.4 Summary ................................................................................................................ 29 3 Analysis of Influencing Factors in Screening Process of Roller Screen ............. 30 3.1 The Influence of Screening Shaft Speed on Screening Process of Roller Screen . 30 3.2 The Influence of Inclination Angle of Screen Surface on Screening Process of Roller Screen ........................................................................................................................... 34 3.3 The Influence of Cohesive Particles on Screening Process of Roller Screen ........ 36 3.4 Summary ................................................................................................................ 38 4 Simulation Study on Screening Process of Roller Screen Based on Aspherical Particles ....................................................................................................................... 39 4.1 Establishment of Aspherical Particles Model in EDEM ........................................ 39 4.2 The Influence of Screening Shaft Speed on the Screening Process of Aspherical Particles ...................................................................................................................... 40 4.3 The Influence of Inclination Angles of Screen Surface on the Screening Process of Aspherical Particles ..................................................................................................... 42 万方数据 VII 4.4 The Influence of Adhesion Energy Densities on the Screening Process of Aspherical Particles ........................................................................................................................ 44 4.5 Summary ................................................................................................................ 45 5 Simulation Study on Screening Process of Roller Screen with Segmented Screening Surface ....................................................................................................... 46 5.1 Selection of Segmented Screening Surface ........................................................... 46 5.2 The Influence of Screening Shaft Speed on Screening System of Segmented Screening Surface ........................................................................................................ 49 5.3 The Influence of Adhesion Energy Density on Screening System of Segmented Screening Surface ........................................................................................................ 51 5.4 Summary ................................................................................................................ 53 6 Wear Analysis and Optimization of Screening Shaft Disc .................................. 54 6.1 Establishment of Wear Analysis Model in EDEM ................................................. 54 6.2 Wear Analysis of Screening Shaft Disc ................................................................. 55 6.3 The Influence of Disc Shape on Screening Process of Roller Screen ................... 60 6.4 Summary ................................................................................................................ 61 7 Conclusions and Expectations ............................................................................... 62 7.1 Conclusions ............................................................................................................ 62 7.2 Expectations ........................................................................................................... 63 References ................................................................................................................... 64 Author’s Resume .................