锤片式粉碎机筛网结构设计与实验研究

发布时间：2018-03-20 13:50

本文选题：锤片式粉碎机　切入点：筛网结构参数　出处：《内蒙古科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：通过对新型筛分原理锤片式粉碎机样机的筛分效果试验研究发现，筛网作为主要的排料设备，与筛分物料直接接触，其结构合理与否直接影响粉碎机筛分效率。课题主要从筛孔形状、筛孔排列和筛网安装角度三个方面对不同粒度大小的物料在不同筛网结构参数下的筛分效率进行了研究首先，论文对新型筛分原理粉碎机的工作原理、课题组前期工作成果进行了介绍，论述了锤片式粉碎机筛分效率研究的背景与意义，并就关于筛分效率的国内外研究现状及不足之处进行了补充说明。其次，确定影响筛分效率的筛网结构参数因素（筛孔形状、筛网安装角度和筛孔排列方式）。在现有的颗粒透筛概率理论的基础上，分析了上述各个筛面结构参数对筛分效率影响的一般规律，，并以此为依据对粉碎机的筛网进行设计，加工。再次，以筛分效率为实验指标，对影响筛分效率的筛网结构参数进行实验研究。以粉碎机样机结构参数为依据，设计模拟透筛装置，并搭建了透筛实验台。应用设计的新筛网在筛分实验台上进行模拟实验。通过考查筛孔形状、筛网安装倾角（筛网倾角）、筛孔排列方式和气流速度四个因素对不同粒度物料筛分效率的影响，找到了适合各粒度级颗粒筛分的粉碎机工作参数和筛网机构参数。实验结果表明，对不同粒度的颗粒筛分，气流速度和筛网安装倾角对筛分效率的影响规律一致，即随着气流速度的增大，筛分效率呈先增后减的趋势，并且颗粒粒度越小，变化越显著；筛孔形状对筛分效率的影响较大，且对不同粒度的颗粒筛分，长方孔筛网都表现出了良好的筛分性能，六角孔筛比正方孔筛筛分效率高，圆孔筛网的筛分效率最低；筛孔的排列方式对筛分效率的影响比较小，相比U型排列的筛网，T型排列的筛网筛分效果较好。最后，对锤片式粉碎机分离装置内颗粒的筛分过程进行了仿真分析。先使用三维建模软件PRO/E建立了锤片式粉碎机分离装置实体模型，然后导入流体分析软件FLUENT中对分离流道内气流场进行了数值模拟，得到收敛的流场分析结果，为FLUENT-EDEM仿真分析提供流场模型，再用FLUENT-EDEM（气流场-颗粒）耦合模块就各实验因素水平对粉碎机筛分过程进行仿真，最后模拟结果与实验进行了对比分析，得出了结论。对比结果显示，模拟结果与实验结果基本吻合，相对误差不超过4％。并以此为依据，确定了筛网结构参数和气流参数的最佳组合。为锤片式粉碎机针对不同粒度的粉碎颗粒选择不同的工作参数提供试验和理论依据。
[Abstract]:Through the experimental study on the screening effect of the new type screening principle hammer crusher prototype, it is found that as the main material discharging equipment, the screen mesh is in direct contact with the screening material. Whether the structure is reasonable or not has a direct effect on the screening efficiency of pulverizer. The screening efficiency of materials with different size and size under different screen structure parameters is studied from three aspects: the shape of sieve hole, the arrangement of sieve holes and the angle of screen mesh installation. First of all, the paper introduces the working principle of the new screening principle pulverizer and the preliminary work results of the research group, and discusses the background and significance of the research on the screening efficiency of the hammer mill. The present situation and deficiency of screening efficiency are also explained. Secondly, the factors affecting the screening efficiency are determined, such as the shape of the sieve hole, the angle of the mesh installation and the arrangement of the sieve hole. On the basis of the existing probability theory of particle permeation, The general law of the influence of the structural parameters of each screen surface on the screening efficiency is analyzed, and the screen screen of the pulverizer is designed and processed. Thirdly, taking the screening efficiency as the experimental index, the structural parameters of the screen screen which affect the screening efficiency are studied experimentally. Based on the structural parameters of the pulverizer prototype, the simulated screening device is designed. The new screen screen was used to simulate the screen test bench. The shape of the sieve hole was examined. The influence of four factors, such as the inclination angle of screen mesh, the arrangement of sieve holes and the velocity of airflow, on the screening efficiency of materials of different granularity, The working parameters of pulverizer and the parameters of screen mesh mechanism are found. The experimental results show that the influence of airflow velocity and installation angle of screen mesh on screening efficiency is consistent with that of particle sieving with different particle sizes. That is, with the increase of airflow velocity, the screening efficiency increases first and then decreases, and the smaller the particle size is, the more obvious the change is. The screening efficiency of hexagonal sieve is higher than that of square sieve, and the screening efficiency of round hole sieve is the lowest, and the influence of the arrangement of sieve holes on the screening efficiency is relatively small. Compared with U-type mesh and T-type mesh, the screening effect is better. Finally, the particle sieving process in the hammer mill separator is simulated and analyzed. Firstly, the solid model of the hammer mill separation device is established by using the 3D modeling software PRO/E. Then the numerical simulation of the flow field in the separation channel is carried out in the fluid analysis software FLUENT, and the convergent flow field analysis results are obtained, which provide the flow field model for the FLUENT-EDEM simulation analysis. Then the screening process of pulverizer is simulated by using FLUENT-EDEM (airflow field-particle) coupling module. Finally, the simulation results are compared with the experimental results, and the conclusion is drawn. The simulation results are in good agreement with the experimental results, and the relative error is not more than 4. The optimum combination of the structural parameters and the airflow parameters of the screen is determined, which provides the experimental and theoretical basis for the hammer mill to select different working parameters for different particle sizes.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S817.122

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