采煤机摇臂的动力响应及优化分析
发布时间：2018-07-23 13:40
【摘要】：随着我国经济建设对煤炭需求的增长,大功率采煤机的普及势在必行,而采煤机能否安全可靠地连续工作就成为人们日益关注的课题。摇臂是采煤机的重要组成部分之一,在工作过程中受到各种复杂的动载荷作用,摇臂能否正常工作,对整个采煤机起到相当重要的作用。本文以J71A型薄煤层大功率采煤机摇臂为研究对象,运用数值模拟方法,系统研究了摇臂的动力学特性,并在此基础上进行了优化分析,取得了以下主要成果:(1)通过对J71A型薄煤层大功率采煤机摇臂进行研究分析,建立了摇臂的三维实体模型;(2)根据采煤机实际工作情况,对摇臂进行力学分析得到了摇臂的负载信息,为后面的研究提供了理论依据;(3)建立了摇臂的刚柔耦合分析模型,进行了运动学仿真,验证了摇臂齿轮系统的传动比,研究了摇臂在不同工况下的应力变形规律,得到了采煤机摇臂工作过程中的危险工况;(4)针对危险工况,对摇臂进行了模态分析,得到了危险工况下摇臂的模态信息,结合采煤机井下实测数据对摇臂进行了瞬态动力学分析,得到了摇臂的动态响应,对响应过程中的最大等效应力和最大位移进行了分析,得到了摇臂工作过程中的危险时刻,对危险时刻摇臂的受力和变形进行分析,得到了摇臂的危险部位;(5)以摇臂危险部位为研究对象,建立了摇臂的优化模型,得到了摇臂壳体的合理厚度和肋板的合理高度。优化后的摇臂结构应力集中现象得以改善,摇臂质量得以减轻。研究成果可为类似机械系统的运动学分析、动力学分析及优化设计提供参考。该论文有图55幅,表19个,参考文献92篇。
[Abstract]:With the increasing demand for coal in China's economic construction, the popularization of high-power shearer is imperative, and whether the shearer can work in a safe and reliable manner has become a growing concern. The rocker arm is one of the important parts of the shearer. It is very important for the whole shearer to be subjected to various complicated dynamic loads in the process of work, and whether the rocker arm can work normally. In this paper, the dynamic characteristics of the rocker arm of J71A thin coal seam high power shearer are systematically studied by using numerical simulation method, and on the basis of this, the optimization analysis is carried out. The main achievements are as follows: (1) by studying and analyzing the rocker arm of J71A high power shearer in thin coal seam, the 3D solid model of rocker arm is established; (2) according to the actual working condition of shearer, The load information of rocker arm is obtained by mechanical analysis. (3) the rigid-flexible coupling analysis model of rocker arm is established and the kinematics simulation is carried out to verify the transmission ratio of rocker arm gear system. The stress and deformation laws of rocker arm under different working conditions are studied, and the dangerous working conditions of the rocker arm of coal mining machine are obtained. (4) the modal analysis of rocker arm is carried out in the light of dangerous working conditions, and the modal information of rocker arm under dangerous working condition is obtained. The transient dynamic analysis of the rocker arm is carried out in combination with the measured data of the coal mining machine, and the dynamic response of the rocker arm is obtained. The maximum equivalent stress and the maximum displacement in the response process are analyzed, and the dangerous moment in the working process of the rocker arm is obtained. The stress and deformation of rocker arm at dangerous moment are analyzed, and the dangerous position of rocker arm is obtained. (5) taking the dangerous part of rocker arm as research object, the optimization model of rocker arm is established, and the reasonable thickness of rocker shell and the reasonable height of rib plate are obtained. After optimization, the stress concentration of rocker arm structure is improved and the quality of rocker arm is reduced. The research results can provide reference for kinematics analysis, dynamic analysis and optimization design of similar mechanical systems. There are 55 pictures, 19 tables and 92 references.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6
本文编号：2139588
[Abstract]:With the increasing demand for coal in China's economic construction, the popularization of high-power shearer is imperative, and whether the shearer can work in a safe and reliable manner has become a growing concern. The rocker arm is one of the important parts of the shearer. It is very important for the whole shearer to be subjected to various complicated dynamic loads in the process of work, and whether the rocker arm can work normally. In this paper, the dynamic characteristics of the rocker arm of J71A thin coal seam high power shearer are systematically studied by using numerical simulation method, and on the basis of this, the optimization analysis is carried out. The main achievements are as follows: (1) by studying and analyzing the rocker arm of J71A high power shearer in thin coal seam, the 3D solid model of rocker arm is established; (2) according to the actual working condition of shearer, The load information of rocker arm is obtained by mechanical analysis. (3) the rigid-flexible coupling analysis model of rocker arm is established and the kinematics simulation is carried out to verify the transmission ratio of rocker arm gear system. The stress and deformation laws of rocker arm under different working conditions are studied, and the dangerous working conditions of the rocker arm of coal mining machine are obtained. (4) the modal analysis of rocker arm is carried out in the light of dangerous working conditions, and the modal information of rocker arm under dangerous working condition is obtained. The transient dynamic analysis of the rocker arm is carried out in combination with the measured data of the coal mining machine, and the dynamic response of the rocker arm is obtained. The maximum equivalent stress and the maximum displacement in the response process are analyzed, and the dangerous moment in the working process of the rocker arm is obtained. The stress and deformation of rocker arm at dangerous moment are analyzed, and the dangerous position of rocker arm is obtained. (5) taking the dangerous part of rocker arm as research object, the optimization model of rocker arm is established, and the reasonable thickness of rocker shell and the reasonable height of rib plate are obtained. After optimization, the stress concentration of rocker arm structure is improved and the quality of rocker arm is reduced. The research results can provide reference for kinematics analysis, dynamic analysis and optimization design of similar mechanical systems. There are 55 pictures, 19 tables and 92 references.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6
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