【摘要】：隨著我國經(jīng)濟(jì)建設(shè)對煤炭需求的增長,大功率采煤機(jī)的普及勢在必行,而采煤機(jī)能否安全可靠地連續(xù)工作就成為人們?nèi)找骊P(guān)注的課題。搖臂是采煤機(jī)的重要組成部分之一,在工作過程中受到各種復(fù)雜的動載荷作用,搖臂能否正常工作,對整個采煤機(jī)起到相當(dāng)重要的作用。本文以J71A型薄煤層大功率采煤機(jī)搖臂為研究對象,運(yùn)用數(shù)值模擬方法,系統(tǒng)研究了搖臂的動力學(xué)特性,并在此基礎(chǔ)上進(jìn)行了優(yōu)化分析,取得了以下主要成果:(1)通過對J71A型薄煤層大功率采煤機(jī)搖臂進(jìn)行研究分析,建立了搖臂的三維實(shí)體模型;(2)根據(jù)采煤機(jī)實(shí)際工作情況,對搖臂進(jìn)行力學(xué)分析得到了搖臂的負(fù)載信息,為后面的研究提供了理論依據(jù);(3)建立了搖臂的剛?cè)狁詈戏治瞿Ｐ?進(jìn)行了運(yùn)動學(xué)仿真,驗(yàn)證了搖臂齒輪系統(tǒng)的傳動比,研究了搖臂在不同工況下的應(yīng)力變形規(guī)律,得到了采煤機(jī)搖臂工作過程中的危險(xiǎn)工況;(4)針對危險(xiǎn)工況,對搖臂進(jìn)行了模態(tài)分析,得到了危險(xiǎn)工況下?lián)u臂的模態(tài)信息,結(jié)合采煤機(jī)井下實(shí)測數(shù)據(jù)對搖臂進(jìn)行了瞬態(tài)動力學(xué)分析,得到了搖臂的動態(tài)響應(yīng),對響應(yīng)過程中的最大等效應(yīng)力和最大位移進(jìn)行了分析,得到了搖臂工作過程中的危險(xiǎn)時(shí)刻,對危險(xiǎn)時(shí)刻搖臂的受力和變形進(jìn)行分析,得到了搖臂的危險(xiǎn)部位;(5)以搖臂危險(xiǎn)部位為研究對象,建立了搖臂的優(yōu)化模型,得到了搖臂殼體的合理厚度和肋板的合理高度。優(yōu)化后的搖臂結(jié)構(gòu)應(yīng)力集中現(xiàn)象得以改善,搖臂質(zhì)量得以減輕。研究成果可為類似機(jī)械系統(tǒng)的運(yùn)動學(xué)分析、動力學(xué)分析及優(yōu)化設(shè)計(jì)提供參考。該論文有圖55幅,表19個,參考文獻(xiàn)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.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD421.6

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