温度对采煤机摇臂结构强度的影响研究

发布时间：2018-05-31 18:23

本文选题：采煤机 + 摇臂　；参考：《中国矿业大学》2015年硕士论文

【摘要】：摇臂作为采煤机的重要组成部分,其工作性能的高低直接影响采煤机的效率。在复杂的采煤工作环境中,摇臂不仅受到由截割煤岩产生的截割阻力和轴向作用力,还因传动系统摩擦产热导致温度升高,与此同时还受到煤尘水雾的污染和侵袭以及散热条件差等因素影响,其中,摇臂发热问题是采煤机实际工作过程中普遍存在的问题。而关于温度对摇臂结构强度影响的有关研究相对较少。因此,本文从理论分析和数值模拟两个方面,基于传热理论对摇臂进行热平衡分析,并利用ABAQUS软件对采煤机摇臂三维温度场分布、热膨胀变形和热-力耦合变形等进行数值模拟研究。主要取得了如下研究成果:(1)依据热传导理论和对流换热理论,对采煤机摇臂进行了产热和散热分析,并根据能量守恒定律列出热平衡方程,得到了摇臂高速传动轴的温升曲线。对比有无水冷系统,摇臂内部安装冷却水管是保证摇臂正常工作的重要途径之一。(2)利用Pro/E软件建立摇臂力学模型,并基于ABAQUS软件对其进行瞬态温度场仿真模拟,得到了摇臂壳体和传动齿轮的温升曲线,以及不同摆角下摇臂温升的变化规律,并以此作为了随后数值模拟的已知条件。(3)在瞬态温度场模拟的基础上,对摇臂受热膨胀和热-力耦合作用数值模拟,得到了摇臂壳体各传动轴处的应力应变规律,以及不同摆角下摇臂最大应力点和最大位移点的变化规律,并对比热膨胀和热-力耦合作用下摇臂的应力应变结果大小,表明温度是影响摇臂应力大小的主要因素,载荷是影响摇臂位移大小的主要因素。研究成果可为控制摇臂箱体内部温升、调整摇臂摆角和截煤深度等,以确保摇臂能够正常工作提供理论依据。
[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.
【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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