多点冲击式截割滚筒工作性能研究.pdf

全日制全日制硕士学位论文硕士学位论文 多点冲击式截割滚筒工作性能研究 Study on the Perance of Multi-point Impact Cutting Drum 作者姓名张旭 导师姓名张强 教授 学科专业机械工程 研究方向机械设计及理论 完成日期2020 年 8 月 11 日 辽宁工程技术大学 Liaoning Technical University 万方数据 学位论文书脊样式学位论文书脊样式 多 点 冲 击 式 截 割 滚 筒 工 作 性 能 研 究 张 旭 辽 宁 工 程 技 术 大 学 万方数据 关于学位论文使用授权的说明关于学位论文使用授权的说明 本学位论文作者及指导教师完全了解 辽宁工程技术大学辽宁工程技术大学 有关保 留、使用学位论文的规定，同意 辽宁工程技术大学辽宁工程技术大学 保留并向国家有关 部门或机构送交论文的复印件和磁盘，允许论文被查阅和借阅，学校可 以将学位论文的全部或部分内容编入有关数据库进行检索，可以采用影 印、缩印或扫描等复制手段保存、汇编本学位论文。 保密的学位论文在解密后应遵守此协议。 学位论文作者签名导师签名 年月日年月日 万方数据 中图分类号TD421学校代码10147 UDC621密级公 开 辽宁工程技术大学 全日制全日制硕士学位论文硕士学位论文 多点冲击式截割滚筒工作性能研究 Study on the Perance of Multi-point Impact Cutting Drum 二○二○年八月 作者姓名张 旭学号471720059 导师姓名张强（教授）副导师姓名（教授） 申请学位工学硕士培养单位机械工程学院 学科专业机械工程研究方向机械设计及理论 万方数据 致致 谢谢 路漫漫其修远兮，求学路如此，科研之路更是如此。一转眼我在辽宁工程技术大学 的日子已经过去了七年之久，感谢我的母校为我提供如此优渥的学习环境，如此肥沃的 成长土壤，让那个初入大学校园的我成长为如今能为社会贡献一份力量的青年。 同时，感谢在这七年中指导我成长的各位老师，是你们将自己所学孜孜不倦的传授 于我，教我读书教我实践，更是教我如何做一个有用之人。感谢我的老师们的“传道受 业解惑”。在众多老师中，尤其要感谢的是我的导师张强教授，在我这三年研究生学习 生活中无论是学习上还是科研方面对我的帮助，张老师一直对我们言传身教，在科研之 路上做我们的指路明灯，教会我们想要科研有所突破，学习有所收获，就要保证学习的 时间和学习的效率，只有肯花时间和精力在自己所在领域才能取得进步。感谢我的导师 为我们付出的心血，感谢导师教授的知识与道理。 最后，还要感谢在我成长求学道路上关心和帮助我的朋友和同学，特别感谢实验室 课题组的师兄弟姐妹们的一路陪伴，在我遇到困难时的热心关心与鼎力相助。更要感谢 我的亲人们，尤其我的父母对我读书求学的一路支持与理解，无论什么时候在我最需要 你们的时候你们一直都在我身后，是我最坚实的护盾。 最后的最后，再次感谢你们的一路相伴，感谢 万方数据 I 摘摘要要 煤炭在未来几十年仍会在我国能源体系中占绝对的主导地位，由于优质煤层不断被 大量开采，煤炭资源必须向更深处探索，深部开采将成为煤炭开采的主流状态，这就意 味着地质条件也会随之复杂，煤岩硬度也将不断增加。近年来针对硬质煤岩的开采技术 与理论正逐步完善，而与之密切相关的开采设备发展较为缓慢。本文为解决这一问题基 于神华神东企业“液压辅助冲击截齿项目”研究成果液压辅助冲击截齿破煤技术， 介绍了一种高效破煤装备多点冲击式滚筒，对于煤炭开采装备的发展与提升以及非 优质煤层的开采效率提高具有一定的理论和实际意义。 本文分析了目前国内外关于采煤机截割滚筒结构方面的研究新成果以及采煤机滚筒 工作性能参数，对煤岩破碎方法及其本构模型进行简单概述，对比传统截割滚筒与冲击 式滚筒破煤岩形式与原理，构建多点冲击式滚筒破煤岩力学模型，分析了破煤岩效率影 响因素及工作性能评价指标，确定数值模拟参数与方案。采用 CATIA 软件建立简化的 采煤机截割滚筒的几何模型， 根据煤岩介质物理力学特性在 EDEM 中建立相似结构离散 元模型，依据滚筒工作过程构建多点冲击式截割滚筒工作数值模拟模型，利用控制变量 法与正交试验法探究单因素与多因素作用下多点冲击式截割滚筒在截割不同介质、采用 不同冲击频率、不同滚筒转速条件下的工作载荷、截割比能耗等变化规律。结果表明 以破煤率为评价指标，影响因素主次顺序为ACB（煤壁硬度滚筒转速冲击频率）， 最优方案组合为 A2B1C3（煤壁硬度为 f5，冲击频率 f4Hz，滚筒转速 n40r/min）；以 截割比能耗为评价指标影响因素主次顺序为CAB（滚筒转速煤壁硬度冲击频率）， 最优方案组合为 A2B1C3（煤壁硬度为 f5，冲击频率 f4Hz，滚筒转速 n40r/min）。进 一步引入矩阵分析法计算可得各个因素对正交试验的指标值影响的主次顺序为 CAB滚筒转速煤壁硬度冲击频率，因素 A2、B1、C3的权重最大，因而最佳方案为 A2B1C3即煤壁硬度为 f5，冲击频率为 f4Hz，滚筒转速为 40r/min。 最后经对照组对照，同等条件下，多点冲击式滚筒落煤量即截落颗粒数目较高为 29131 个较无冲击式滚筒落煤数提高了 24.86；有冲击式滚筒截割比能耗为 0.7423kWh/m3，相较于无冲击式滚筒节约了 0.2053 kWh/m3。因此，本文所得多点冲击 式滚筒最优参数组合合理，且性能优于传统无冲击滚筒。 该论文有图 38 幅，表 20 个，参考文献 107 篇。 关键词关键词多点冲击；滚筒；硬质煤壁；离散元；破煤模型；正交试验；矩阵分析 万方数据 II Abstract Coal will still occupy an absolute dominant position in Chinas energy system in the next few decades, but with the depletion of high-quality coal seam reserves, the depth of coal mining in China will continue to increase, deep mining will become the normal in the development of coal resources, the geological conditions will be more complex in the future, and the hardness of coal and rock will continue to increase. In recent years, the mining technology and theory of hard coal and rock are being improved gradually, but the development of mining equipment is relatively slow. In order to solve this problem, based on the research result of “hydraulic-aided impact cutting tooth project“ in Shenhua Shendong enterprise, this paper introduces a multi-point impact cutting drum for high-efficiency coal breaking equipment. It is of theoretical and practical significance for the development and upgrading of coal mining equipment and the improvement of mining efficiency of non-quality coal seam. This paper analyzes the new research achievements and the perance parameters of shearers drum, briefly summarizes the coal-rock crushing and its constitutive model, compares the traditional cutting drum with the rock-breaking principle, constructs the multi-point impact-type rock-breaking model, analyzes the influence factors and perance uation index of coal-breaking efficiency, and determines the numerical simulation parameters and scheme. The simplified geometric model of shearer cutting drum is established by CATIA software, the similar structure discrete element model is established in EDEM according to the physical and mechanical characteristics of coal and rock medium, and the multi-point impact cutting drum working numerical simulation model is constructed according to the working process of the drum. The results show that Taking the coal drop rate as the uation index, the main order of influencing factors isACBcoal wall hardnessdrum rotation speedimpact frequency, and the optimal scheme combination is A2B1C3coal wall hardnessf5, impact frequency f4Hz, drum rotation speed n40r/min. Taking the energy consumption of cutting ratio as the uation index, the main and secondary order of the influencing factors are CABdrum rotation speed coal wall hardness impact frequency, and the optimal scheme combination is A2B1C3coal wall hardness f5, impact frequency f4Hz, drum speed n40r/min .Further introduction of matrix analysis, the primary and secondary order of the influence of each factor on the index value of orthogonal test is C A B drum rotation speed coal wall hardness impact frequency, and the weight of factor A2, B1and C3 万方数据 III is the largest, so the best scheme is A2B1C3, that is, the hardness of coal wall is f5, the impact frequency is f 4Hz, and the drum speed is 40r/min. At last, number of falling particles of multi-point impact drum is 29131 higher than that of non-impact drum 24.86 under the same conditions,the energy consumption of the impact-free drum cutting ratio is 0.7423 kWh/m3, which saves 0.2053 kWh/m3compared to the impact-free drum. Therefore, the optimal parameter combination of multi-point impact roller is reasonable, and the perance is better than that of traditional impact-free roller. Keywords multi-point impact; drum;hard coal wall; discrete element ; coal breaking model; orthogonal test; matrix analysis 万方数据 IV 目目录录 摘要摘要................................................................................................................................................. I I 目录目录................................................................................................................................................. I I 图清单图清单........................................................................................................................................... VIVI 表清单表清单........................................................................................................................................... XIXI 变量注释表变量注释表...............................................................................................................................XIIIXIII 1 1 绪论绪论............................................................................................................................................. 1 1 1.1 研究目的和意义..................................................................................................................... 1 1.2 国内外研究现状..................................................................................................................... 1 1.3 主要研究内容与技术路线..................................................................................................... 7 2 2 采煤机截割部工作性能参数分析采煤机截割部工作性能参数分析..............................................................................................9 9 2.1 煤体物理机械性质概述.......................................................................................................... 9 2.2 截割滚筒破煤岩形式及过程................................................................................................ 11 2.3 冲击式滚筒性能参数分析.................................................................................................... 21 2.4 模拟方案确定........................................................................................................................ 23 2.5 本章小结................................................................................................................................ 24 3 3 单因素对多点冲击式截割滚筒工作性能的影响单因素对多点冲击式截割滚筒工作性能的影响....................................................................2525 3.1 截割滚筒破煤岩数值模型建立............................................................................................ 25 3.2 截割介质物理力学参数对多点冲击式截割滚筒工作性能的影响.................................... 34 3.3 冲击频率对多点冲击式截割滚筒工作性能的影响............................................................ 38 3.4 滚筒转速对多点冲击式截割滚筒工作性能的影响............................................................ 43 3.5 本章小结................................................................................................................................ 48 4 4 多因素对多点冲击式截割滚筒工作性能的影响多因素对多点冲击式截割滚筒工作性能的影响....................................................................5050 4.1 正交试验方案设计................................................................................................................ 50 4.2 多点冲击式截割滚筒工作过程分析.................................................................................... 50 4.3 多因素对多点冲击式截割滚筒工作性能的影响分析........................................................ 53 4.4 本章小结................................................................................................................................ 62 5 5 多点冲击与无冲击条件下滚筒工作性能对比分析多点冲击与无冲击条件下滚筒工作性能对比分析................................................................6767 万方数据 V 5.1 无冲击条件下滚筒破煤岩数值模拟研究............................................................................ 67 5.2 多点冲击与无冲击条件下滚筒工作性能对比分析............................................................ 67 5.3 本章小结................................................................................................................................ 69 6 6 结论与展望结论与展望............................................................................................................................... 7171 6.1 主要结论................................................................................................................................ 71 6.2 工作展望................................................................................................................................ 72 参考文献参考文献.......................................................................................................................................7373 作者简历作者简历.......................................................................................................................................7979 学位论文原创性声明学位论文原创性声明...................................................................................................................8181 学位论文数据集学位论文数据集...........................................................................................................................8282 万方数据 VI Contents Abstract...........................................................................................................................................I Contents...........................................................................................................................................I List of Figures..............................................................................................................................VI List of Tables................................................................................................................................XI List of Variables........................................................................................................................XIII 1 Introduction.................................................................................................................................1 1.1 Purpose and significance of the study ......................................................................................1 1.2 Research status at home and abroad ........................................................................................1 1.3 Main research contents and technical route .............................................................................7 2 Analysis of Perance Parameters of Shearers Cutting Parts ........................................9 2.1 Overview of physical and mechanical properties of coal bodies .............................................9 2.2 The and process of coal-rock breaking by cutting drum ...............................................11 2.3 Analysis of Perance Parameters of Impact Roller ......................................................... 21 2.4 Simulation programme determination ...................................................................................23 2.5 Summary of this chapter ........................................................................................................24 3 Effect of Single Factor on Perance of Multi-point Impact Cutting Drum ................25 3.1 Establishment of numerical model of cut-out coal and rock in cutting drum ........................25 3.2 Effect of Physical and Mechanical Parameters on the Perance of Multi-point Impact Cutting Drum ...............................................................................................................................34 3.3 Impact frequency on perance of multi-point impact cutting drum ................................ 38 3.4 Effect of roller rotation speed on perance of multi-point impact cutting drum .............43 3.5 Summary of this chapter ........................................................................................................48 4 Effect of Multi-factor on Perance of Multi-point Impact Cutting Drum ..................50 4.1 Design of orthogonal test scheme ..........................................................................................50 4.2 Analysis on the Working Process of Multi-point Impact Cutting Drum ...............................50 4.3 Analysis of the Influence of Multi-factor on the Perance of Multi-point Impact Cutting Drum ...............................................................................................................................53 4.4 Summary of this chapter ........................................................................................................62 万方数据 VII 5 Comparative Analysis on the Perance of Rollers under the Conditions of Multi-point Impact and No Impact ..........................................................................................67 5.1 Numerical simulation study of coal-rock broken by drum without impact ...........................67 5.2 Comparative Analysis on the Perance of Rollers under the Conditions of Multi-point Impact and No Impact ..................................................................................................................67 5.3 Summary of this chapter ........................................................................................................69 6 Summary of this chapter ........................................................................................................71 6.1 Main conclusions ................................................................................................