本文選題：采煤機 + 搖臂��； 參考：《中國礦業(yè)大學》2015年碩士論文

【摘要】：搖臂作為采煤機的重要組成部分,其工作性能的高低直接影響采煤機的效率。在復雜的采煤工作環(huán)境中,搖臂不僅受到由截割煤巖產(chǎn)生的截割阻力和軸向作用力,還因傳動系統(tǒng)摩擦產(chǎn)熱導致溫度升高,與此同時還受到煤塵水霧的污染和侵襲以及散熱條件差等因素影響,其中,搖臂發(fā)熱問題是采煤機實際工作過程中普遍存在的問題。而關于溫度對搖臂結構強度影響的有關研究相對較少。因此,本文從理論分析和數(shù)值模擬兩個方面,基于傳熱理論對搖臂進行熱平衡分析,并利用ABAQUS軟件對采煤機搖臂三維溫度場分布、熱膨脹變形和熱-力耦合變形等進行數(shù)值模擬研究。主要取得了如下研究成果:(1)依據(jù)熱傳導理論和對流換熱理論,對采煤機搖臂進行了產(chǎn)熱和散熱分析,并根據(jù)能量守恒定律列出熱平衡方程,得到了搖臂高速傳動軸的溫升曲線。對比有無水冷系統(tǒng),搖臂內部安裝冷卻水管是保證搖臂正常工作的重要途徑之一。(2)利用Pro/E軟件建立搖臂力學模型,并基于ABAQUS軟件對其進行瞬態(tài)溫度場仿真模擬,得到了搖臂殼體和傳動齒輪的溫升曲線,以及不同擺角下?lián)u臂溫升的變化規(guī)律,并以此作為了隨后數(shù)值模擬的已知條件。(3)在瞬態(tài)溫度場模擬的基礎上,對搖臂受熱膨脹和熱-力耦合作用數(shù)值模擬,得到了搖臂殼體各傳動軸處的應力應變規(guī)律,以及不同擺角下?lián)u臂最大應力點和最大位移點的變化規(guī)律,并對比熱膨脹和熱-力耦合作用下?lián)u臂的應力應變結果大小,表明溫度是影響搖臂應力大小的主要因素,載荷是影響搖臂位移大小的主要因素。研究成果可為控制搖臂箱體內部溫升、調整搖臂擺角和截煤深度等,以確保搖臂能夠正常工作提供理論依據(jù)。
[Abstract]:As an important part of shearer, the performance of rocker directly affects the efficiency of shearer. In the complex coal mining environment, the rocker arm is not only subjected to cutting resistance and axial force caused by cutting coal and rock, but also caused by the temperature rising due to friction heat of transmission system. At the same time, it is also affected by the pollution and invasion of coal dust and water mist, and the poor heat dissipation conditions. Among them, the problem of rocker arm heating is a common problem in the actual working process of shearer. However, there are few studies on the effect of temperature on the strength of rocker arm. Therefore, based on the theory of heat transfer, the thermal balance of rocker arm is analyzed from two aspects of theoretical analysis and numerical simulation, and the three-dimensional temperature field distribution of the rocker arm of shearer is analyzed by using ABAQUS software. Thermal expansion deformation and thermo-mechanical coupling deformation are studied numerically. According to the heat conduction theory and the convection heat transfer theory, the heat production and heat dissipation of the rocker arm of the shearer are analyzed, and the heat balance equation is listed according to the law of conservation of energy, and the temperature rise curve of the rocker arm high speed drive shaft is obtained. Comparing with the water-cooling system, the installation of cooling water pipe in the rocker arm is one of the important ways to ensure the normal operation of the rocker arm. The mechanical model of the rocker arm is established by using Pro/E software, and the transient temperature field is simulated based on the ABAQUS software. The temperature rise curve of the rocker arm shell and transmission gear and the variation law of the rocker arm temperature rise under different swing angles are obtained, which is regarded as the known condition of subsequent numerical simulation. (3) on the basis of transient temperature field simulation, By numerical simulation of thermal expansion and thermal-mechanical coupling of rocker arm, the stress-strain law of each transmission shaft of rocker arm shell and the variation law of maximum stress point and maximum displacement point of rocker arm under different pendulum angles are obtained. The results of stress and strain of rocker arm under thermal expansion and thermal-mechanical coupling are compared. The results show that temperature is the main factor affecting the stress of rocker arm, and load is the main factor affecting the displacement of rocker arm. The research results can provide a theoretical basis for controlling the temperature rise inside the rocker box, adjusting the rocker arm swing angle and coal cutting depth, and ensuring the rocker arm can work normally.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD421.6

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