盘磨机磨区流场模拟及磨盘齿型优化的研究

发布时间：2018-02-02 18:32

本文关键词： 制浆造纸盘磨机磨盘结构 CFD CAM　出处：《陕西科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：造纸用盘磨机作为过程流体机械的代表性设备,已广泛应用于制浆造纸领域,人们对其磨盘的材料、制造工艺、磨盘失效(磨损)机理、磨齿排列方式等方面进行了广泛研究,磨盘齿型的设计、选择合理与否,将直接影响盘磨机打浆的质量和能效。本文基于三维建模软件SOLIDWORKS建立了制浆造纸用盘磨机常用的5种不同齿型的磨盘模型,并使用计算流体力学(CFD)软件Flow Simulation对这5种磨盘进行了内部流场模拟和分析。通过只改变磨盘齿型排列的方式,对磨盘磨区内浆料流速、流态以及磨齿表面受力的情况进行模拟和分析,发现这5种齿型结构所产生的磨浆效果差异明显,各有优劣,并在此研究的基础上提出了一种新型磨盘,最后通过数控雕刻机将磨盘加工成型,以便后来研究者对盘磨机磨盘磨浆过程做进一步的研究。本文的具体工作如下:(1)综述了国内外盘磨机磨盘设计理论及磨盘内部流场数值模拟分析的研究现状,磨盘齿型和排列结构设计理论及其对磨浆过程的影响因素等。建立了盘磨机齿型设计参数及磨盘内部流场计算机模拟的依据,并阐述了本文研究的内容及意义。(2)从浆料动力学原理的角度,对纸浆在磨盘齿槽内的流动机理进行了深入分析。明确了在复杂作用力的合力下,浆料在磨齿沟槽中的运动趋势,为解释磨浆过程计算机模拟结果以及新磨盘齿型结构设计提供了依据。(3)使用计算流体力学软件Flow Simulation,采用单因素法,对目前常用的5种不同齿型结构的盘磨机磨盘内部以15%工作浓度的浆料进行模拟分析,得到其内部流场流速、流迹线和磨齿表面剪应力的分布,横向对比了这5种不同齿型结构的磨盘优缺点,探讨了影响浆料流动状态的规律。(4)基于前文研究结果,通过演化传统磨盘齿型排列的方法,提出了一种新齿型磨盘。对新型磨盘内部流场进行计算机模拟,将模拟结果与前文中的5种常用磨盘进行对比。新型磨盘内部流场流动顺畅,流速均匀,磨齿表面受力良好,达到了改进提高的目的。(5)借助ArtCAM与Mach Mill辅助制造工具,使用CNC系统,以无色透明有机玻璃为材料,对上述磨盘进行了加工制造,为后期搭建可配合高速摄影机观察磨浆过程的小型试验平台打下了基础。
[Abstract]:As the representative equipment of process fluid machinery, disk mill for paper making has been widely used in pulping and papermaking fields. The arrangement of grinding teeth has been extensively studied, the design of grinding disk tooth profile, the selection of reasonable or not. Based on the 3D modeling software SOLIDWORKS, the paper establishes five kinds of different tooth type grinding disk models used in pulping and papermaking disc mill. The internal flow field of the five kinds of discs was simulated and analyzed by using the computational fluid dynamics (CFD) software Flow Simulation. Through the simulation and analysis of slurry flow velocity, flow state and the force on the surface of grinding teeth in the grinding area, it is found that the grinding effect of these five kinds of tooth structures is obviously different, and each of them has its own merits and demerits. On the basis of this research, a new type of grinding disc is proposed. Finally, the grinding disk is machined and shaped by numerical control engraving machine. In order to do further research on the grinding process of disc mill. The specific work of this paper is as follows: 1). The design theory of disc mill at home and abroad and the research status of numerical simulation analysis of internal flow field of disc mill are summarized. The design theory of tooth profile and arrangement structure of disc and its influence factors on the grinding process are discussed. The design parameters of tooth profile of disc mill and the basis of computer simulation of the flow field inside the disc are established. The content and significance of this paper are expounded. (2) from the angle of slurry dynamics principle, the flow mechanism of pulp in grinding disk slot is analyzed in depth, and the resultant force of complex force is defined. Movement trend of slurry in Grinding Groove. In order to explain the results of computer simulation of grinding process and the structure design of new grinding disk tooth shape, the single factor method was used to explain the results of computer simulation of the grinding process and the computational fluid dynamics software Flow simulation. The flow field velocity, flow trace line and shear stress distribution on the surface of five kinds of disc grinders with different tooth structure were simulated and analyzed with the slurry of 15% working concentration. The flow velocity, the flow trace and the shear stress distribution on the surface of the grinding teeth were obtained. The advantages and disadvantages of the five kinds of different tooth structure are compared and the rule of influencing the flow state of the slurry is discussed. Based on the results of the previous study, the traditional method of tooth shape arrangement of the grinding disc is evolved. In this paper, a new type of grinding disc is proposed. The flow field inside the new type disc is simulated by computer, and the simulation results are compared with the five kinds of commonly used grinding discs mentioned above. The flow field in the new type disc is smooth and the flow velocity is uniform. The surface of grinding teeth has good force, and the purpose of improvement and improvement is achieved. (5) with the aid of ArtCAM and Mach Mill, CNC system is used and colorless transparent plexiglass is used as the material. The grinding disc is manufactured, which lays the foundation for setting up a small test platform for observing the slurry process with high speed camera in the later stage.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS73

【参考文献】