本文選題：錘片式粉碎機　切入點：篩網結構參數　出處：《內蒙古科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：通過對新型篩分原理錘片式粉碎機樣機的篩分效果試驗研究發(fā)現(xiàn)，篩網作為主要的排料設備，與篩分物料直接接觸，其結構合理與否直接影響粉碎機篩分效率。課題主要從篩孔形狀、篩孔排列和篩網安裝角度三個方面對不同粒度大小的物料在不同篩網結構參數下的篩分效率進行了研究 首先，論文對新型篩分原理粉碎機的工作原理、課題組前期工作成果進行了介紹，論述了錘片式粉碎機篩分效率研究的背景與意義，并就關于篩分效率的國內外研究現(xiàn)狀及不足之處進行了補充說明。 其次，確定影響篩分效率的篩網結構參數因素（篩孔形狀、篩網安裝角度和篩孔排列方式）。在現(xiàn)有的顆粒透篩概率理論的基礎上，分析了上述各個篩面結構參數對篩分效率影響的一般規(guī)律，，并以此為依據對粉碎機的篩網進行設計，加工。 再次，以篩分效率為實驗指標，對影響篩分效率的篩網結構參數進行實驗研究。以粉碎機樣機結構參數為依據，設計模擬透篩裝置，并搭建了透篩實驗臺。應用設計的新篩網在篩分實驗臺上進行模擬實驗。通過考查篩孔形狀、篩網安裝傾角（篩網傾角）、篩孔排列方式和氣流速度四個因素對不同粒度物料篩分效率的影響，找到了適合各粒度級顆粒篩分的粉碎機工作參數和篩網機構參數。實驗結果表明，對不同粒度的顆粒篩分，氣流速度和篩網安裝傾角對篩分效率的影響規(guī)律一致，即隨著氣流速度的增大，篩分效率呈先增后減的趨勢，并且顆粒粒度越小，變化越顯著；篩孔形狀對篩分效率的影響較大，且對不同粒度的顆粒篩分，長方孔篩網都表現(xiàn)出了良好的篩分性能，六角孔篩比正方孔篩篩分效率高，圓孔篩網的篩分效率最低；篩孔的排列方式對篩分效率的影響比較小，相比U型排列的篩網，T型排列的篩網篩分效果較好。 最后，對錘片式粉碎機分離裝置內顆粒的篩分過程進行了仿真分析。先使用三維建模軟件PRO/E建立了錘片式粉碎機分離裝置實體模型，然后導入流體分析軟件FLUENT中對分離流道內氣流場進行了數值模擬，得到收斂的流場分析結果，為FLUENT-EDEM仿真分析提供流場模型，再用FLUENT-EDEM（氣流場-顆粒）耦合模塊就各實驗因素水平對粉碎機篩分過程進行仿真，最后模擬結果與實驗進行了對比分析，得出了結論。對比結果顯示，模擬結果與實驗結果基本吻合，相對誤差不超過4％。并以此為依據，確定了篩網結構參數和氣流參數的最佳組合。為錘片式粉碎機針對不同粒度的粉碎顆粒選擇不同的工作參數提供試驗和理論依據。
[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.
【學位授予單位】：內蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S817.122

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本文編號：1639353