【作者】 李洋；

【导师】 孙俊奇；

【作者基本信息】 吉林大学 ， 高分子化学与物理， 2012， 博士

【摘要】 悬臂式掘进机主要用于巷道的掘进，由于其工作环境恶劣，截割机构受力复杂，且工作过程中载荷波动范围比较大，振动较大，振动产生冲击载荷，冲击机器零件的强度。为大幅度提高掘进机的生产效率和机械化程度，对掘进机提出了更高的要求，需要掘进机对工作环境有更好的适应性和更高的稳定性。本论文以EBH360型悬臂式掘进机的截割臂为研究对象。掘进机在向前掘进时，截割臂受力复杂，主要包括法向阻力、切向阻力和顶推阻力等，且法向阻力的方向不定，此外还有动载荷的影响，截割臂的合理结构决定掘进机器的工作性能及整机的稳定性，如果截割臂的结构强度和刚度不满足要求，将会使得掘进机的整体性能下降和疲劳破裂，甚至造成事故。论文对截割臂的各组成部分进行应力分析，然后进行强度校核，对应力集中或者危险区域进行优化设计和结构改进，具体内容如下：（1）分析了掘进机的工作过程及原理，确定出截割头的工况载荷，用于结构件静强度计算。通过分析，确定出四种危险工况，分别为截割臂处于水平位置、垂直力最大位置、最高位置和最低位置。（2）建立了截割臂的三维实体模型，并利用有限元分析软件ANSYS对以上四种工况进行了有限元分析，经过分析发现掘进机在工作过程中容易发生损坏的零部件包括外筒、轴套以及后座板。（3）根据有限元分析的结果，针对最大应力出现的具体位置，对各个件进行了改进设计，然后建立修改后的有限元模型，选择截割臂处于水平位置工况进行分析，结果表明，经过修改后的模型应力明显降低，满足设计要求。更多还原

【Abstract】 Roadheader, whose development improves the tunneling speed and efficiency of minetunnels greatly, is commonly used equipment in drifting tunnel. In the adverse workingenvironment, the load fluctuation range of cutting mechanism that with complexity of stressis large during working process. Meanwhile the large vibration has an impact to the strengthof the machine parts. For the production efficiency and mechanization degree couldimprove greatly, better adaptability and higher stability for working environment is neededto boring machine.This paper study on EBH360cantilevered boring machine’s cutting arm. During workingprocess, the cutting arm is forced by various resistances, such as tangential resistance,incremental launching resistance, normal resistance whose direction is uncertain, and thedynamic load. The work performance and the stability of the whole machine are determinedby the rational structure of boring machine. And deficient structure strength and stiffnesswill decrease the cutting performance and cause fatigue break. With stress analysis andstrength check of components of cutting arm, this paper optimized the design and improvedthe structure for stress concentration and hazardous areas. Details are as follows:1) The work process and the principles of the boring machine were analyzed to determinethe condition load that use to calculate static strength of structural components. Accordin tothe analysis, four dangerous condition were determined which are the cutting arm in theposition of the horizontal, the vertical force maxium, the highest, the lowest, respectively.2) Pro/e is a3D modeling software that was used to establish three-dimensional solidmodel of cutting arm. And the ANSYS, a finite element analysis software, was used in thefinite element analysis of above mentioned conditions. The analysis suggests that duringworking the parts that easy to damage include the outer cylinder, the axle sleeve and thebackseat plate.3) According to the result of finite element analysis, for the specific position of the maximum stress, various parts were designed and modified. Then the finite element analysismodel that was modified was established. The analysis of the condition that cutting arm inthe horizontal position suggests that the stress of the modified model decreased significantly,which meets the design requirements.更多还原