【摘要】：概率篩裝有多層篩網(wǎng),能夠通過一次篩分作業(yè)而得到多個級別粒徑的物料。在工業(yè)水平不斷提升的大背景之下,由于工程施工等相關(guān)應(yīng)用領(lǐng)域的規(guī)模不斷擴大,篩分機械的需求量也不斷提升,其中以概率篩的表現(xiàn)尤為突出。與此同時,大量的工程實踐表明,篩分作業(yè)當中出現(xiàn)的顆粒堵孔現(xiàn)象是非常普遍的,又因為作業(yè)過程的復雜程度,因此堵孔問題的發(fā)生很難徹底消除,而本文就是針對概率篩使用過程中的堵孔問題展開深入探討。首先介紹了概率篩的一般結(jié)構(gòu)形式以及設(shè)備的作業(yè)機理,對概率篩各方面特性有一個較系統(tǒng)的分析。研究分析了概率篩的篩分性能及其作業(yè)參數(shù),如設(shè)備振動幅值、作業(yè)頻率、篩網(wǎng)作業(yè)面積、篩機作業(yè)效果等,以及各個參數(shù)的取值影響因素及其求解公式。其次研究了顆粒的堵孔概率及其影響因素,從篩分過程中顆粒的運動與受力狀態(tài)的分析入手,在現(xiàn)有理論的基礎(chǔ)上建立顆粒堵孔概率的數(shù)學模型,同時分析影響堵孔的因素,最后選取一些主要的因素展開試驗,得出各因素對堵孔的影響規(guī)律,根據(jù)試驗數(shù)據(jù)繪制關(guān)系曲線。然后針對篩網(wǎng)的清理作業(yè)進行探討,分析清理過程中堵孔顆粒的受力狀態(tài),并在此基礎(chǔ)上得出影響堵孔顆粒脫孔的因素及規(guī)律,同時選取最主要的因素開展清理試驗,根據(jù)試驗數(shù)據(jù)繪制關(guān)系曲線。最后分析并總結(jié)了振動篩分作業(yè)中減少物料顆粒堵孔的方法以及對篩網(wǎng)進行清理作業(yè)的方法,并對不同方法進行分析比較得出各自的優(yōu)缺點。重點對振動軌跡為直線型以及圓型的作業(yè)設(shè)備進行了分析,得出這兩種振動方式機型的最佳清理時機。根據(jù)以上分析結(jié)果,為概率篩的后續(xù)優(yōu)化設(shè)計提出一些合理建議,對未來的深入研究提供有益的指導。
[Abstract]:The probabilistic sieve is equipped with a multilayer screen, which can obtain multiple particle sizes through a single sieving operation. Under the background of continuous upgrading of industrial level, the demand for screening machinery is also increasing because of the continuous expansion of engineering construction and other related application fields, especially the performance of probability sieve. At the same time, a large number of engineering practices show that the phenomenon of particle plugging in screening operations is very common, and because of the complexity of the operation process, it is very difficult to completely eliminate the problem of pore plugging. This paper is aimed at probabilistic sieve in the use of the problem of hole plugging in depth. Firstly, the general structure of the probability screen and the operation mechanism of the equipment are introduced, and the characteristics of the probability screen are analyzed systematically. The sieving performance and operating parameters of the probabilistic sieve, such as the vibration amplitude of the equipment, the operating frequency, the working area of the screen, the operation effect of the screen machine, and the influence factors of each parameter and its solution formula are studied and analyzed. Secondly, the pore plugging probability and its influencing factors are studied. The mathematical model of particle plugging probability is established on the basis of the existing theories, and the factors that affect the pore plugging are analyzed based on the analysis of particle movement and force state in the process of screening. Finally, some main factors are selected to carry out the experiment, and the influence of each factor on the hole plugging is obtained, and the relationship curve is drawn according to the test data. Then the cleaning operation of screen mesh is discussed, and the stress state of the plugged particles in the cleaning process is analyzed. On the basis of this, the factors and rules that affect the removal of the pore plugging particles are obtained, and the most important factors are selected to carry out the cleaning test at the same time. Draw the curve according to the test data. Finally, the methods of reducing material particle plugging and cleaning the screen are analyzed and summarized, and the advantages and disadvantages of different methods are analyzed and compared. The working equipment with linear and circular vibration trajectory is analyzed, and the optimal cleaning time of these two vibration modes is obtained. Based on the above analysis results, some reasonable suggestions are put forward for the further optimization design of the probabilistic sieve, which provides useful guidance for further research in the future.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ051.72

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