双齿辊破碎机工作参数与破碎机理数值模拟研究

发布时间：2018-04-24 22:31

本文选题：双齿辊破碎机 + 离散元方法　；参考：《吉林大学》2017年硕士论文

【摘要】：双齿辊破碎机是一种重要的矿山机械,与其他破碎设备相比,具有功耗低,生产率高、排料粒度均匀等突出优势,符合机械产品节能高效的发展方向。为使双齿辊破碎机结构参数与工作参数更加合理,就必须对现有设备进行持续的改进与优化。双齿辊破碎机等大型矿山机械设备的传统研发与优化需要在实物样机上进行大量试验,不仅需要耗费大量人力物力,而且时效性低。离散元法是一种新型的数值模拟方法,将基于离散元法的工程应用仿真软件EDEM应用于双齿辊破碎机等机械产品的优化与研发,可以有效减少研发成本和时间,对实现机械产品结构优化和工作性能改进具有重要意义。本文通过查阅国内外相关文献,论述了离散元法在双齿辊破碎机研究领域中的应用,介绍了双齿辊破碎机的研究背景及国内外应用现状、主要结构以及破碎原理,分析了双齿辊破碎机生产能力和有用功率等性能参数的计算方法。本文重点研究了双齿辊破碎机的结构参数和工作参数对其工作性能的影响,并应用离散元和有限元耦合的方法对齿辊的强度和磨损规律进行了研究,为双齿辊破碎机的结构优化提供了参考。利用离散元法,建立双齿辊破碎机仿真模型,并选取齿辊转速、齿辊间距和齿牙螺旋角为变量建立离散元仿真组。分别提取了仿真过程中双齿辊破碎机的生产能力、有用功率和物料颗粒的运动受力情况,且有用功率的仿真结果与理论公式计算结果之间的差别在合理范围之内,从而验证了仿真结果的正确性。总结了齿辊转速、齿牙螺旋角以及齿辊间距对产量、能耗和产品粒度的影响规律,确定了一定齿辊转速范围内的双齿辊破碎机齿牙螺旋角和齿辊间距的最佳值。基于EDEM-Workbench耦合方法对双齿辊破碎机齿辊的应力和变形情况进行了研究,得出了相应的应力分布及位移数据,为双齿辊破碎机齿环和齿牙的优化提供了参考。并通过分析齿辊能量积累分布云图,总结出齿牙顶部和齿牙侧面接近齿尖处两个位置发生磨损的主要原因是法向磨损,而齿牙侧面发生磨损的主要原因是切向磨损。本文通过对不同的结构参数与工作参数的双齿辊破碎机的仿真分析,得到了双齿辊破碎机工作和结构参数对其破碎效果的影响;并基于离散元与有限元耦合的方法初步探究了双齿辊破碎机的磨损规律,对提高双齿辊破碎机的生产效益和经济效益都具有积极的促进作用。
[Abstract]:Double-toothed roller crusher is an important mining machinery. Compared with other crushing equipment, it has the advantages of low power consumption, high productivity, uniform grain size and so on, which is in line with the development direction of energy saving and high efficiency of mechanical products. In order to make the structural parameters and working parameters more reasonable, the existing equipment must be continuously improved and optimized. The traditional research and development and optimization of large mining machinery such as double-toothed roller crusher need a large number of experiments on the physical prototype, which not only need a lot of manpower and material resources, but also have low timeliness. The discrete element method is a new numerical simulation method. Applying the engineering application simulation software EDEM based on the discrete element method to the optimization and development of mechanical products such as double-tooth roller crusher can effectively reduce the cost and time of research and development. It is of great significance to realize the structure optimization and performance improvement of mechanical products. In this paper, the application of discrete element method in the research field of double tooth roller crusher is discussed by consulting relevant documents at home and abroad. The research background, application status, main structure and crushing principle of double tooth roller crusher are introduced. The calculation method of performance parameters such as productive capacity and useful power of double tooth roller crusher is analyzed. In this paper, the influence of the structure parameters and working parameters of the double-tooth roller crusher on its working performance is mainly studied, and the strength and wear law of the tooth roller are studied by using the coupling method of discrete element and finite element. It provides a reference for the structure optimization of double tooth roller crusher. The simulation model of double-tooth roller crusher was established by using discrete element method, and the discrete element simulation group was established by selecting the rotation speed of tooth roll, the distance between tooth rollers and the spiral angle of tooth teeth as variables. The productive capacity, the useful power and the moving force of the material particle are extracted respectively during the simulation process, and the difference between the simulation results of the useful power and the calculation results of the theoretical formula is within a reasonable range. The correctness of the simulation results is verified. The effects of the rotation speed of the tooth roller, the spiral angle of the tooth tooth tooth and the distance between the teeth rollers on the output, energy consumption and product granularity are summarized. The optimum values of the tooth spiral angle and the tooth roll spacing of the double-tooth roller crusher in a certain range of rotational speed of the tooth roll are determined. Based on the EDEM-Workbench coupling method, the stress and deformation of the tooth roller of the double tooth roller crusher are studied, and the corresponding stress distribution and displacement data are obtained, which provides a reference for the optimization of the tooth ring and tooth tooth of the double tooth roller crusher. By analyzing the energy accumulation and distribution of tooth roller, it is concluded that normal wear is the main cause of wear at the top and side of tooth near the cusp, and tangential wear is the main cause of wear on the side of tooth. Through the simulation analysis of the double-tooth roller crusher with different structure parameters and working parameters, the influence of the working and structure parameters of the double-tooth roller crusher on its crushing effect is obtained. Based on the coupling method of discrete element and finite element, the wear law of double-tooth roller crusher is preliminarily explored, which can promote the production benefit and economic benefit of double-tooth roller crusher.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD451

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