振動給料機偏心振動下物料顆粒運動分析與糾偏研究
發(fā)布時間：2018-08-05 13:49
【摘要】：在轉底爐直接還原工藝中,爐膛上含碳球團的厚度和分布效果對海綿鐵的品質和生產效率有直接的影響。國內外學者通過研究,設計出了一類新型的振動給料機,可實現(xiàn)爐膛周向和徑向上的等厚度布料。但由于振動給料機存在偏心,爐膛上的料層會出現(xiàn)厚度不均勻現(xiàn)象,達不到工藝要求。有鑒于此,本文以振動給料機為研究對象,對偏心造成的布料不均勻問題進行了系統(tǒng)的研究,從偏心狀態(tài)下振動給料機的振動及物料顆粒運動特性兩方面探究這一現(xiàn)象產生的機理,并尋找解決方案。 在深入分析振動給料機的結構、原理及振動特性的基礎上,將質心與激振力作用線不重合的現(xiàn)象定義為偏心,建立了振動給料機的五自由度振動模型,通過振型疊加法求解出了不同偏心狀態(tài)下的穩(wěn)態(tài)響應；并利用MATLAB進行數(shù)值計算,得到偏心與穩(wěn)態(tài)振動幅值的關系曲線,分析了偏心對振動給料機穩(wěn)態(tài)振動特性的影響。 推導了直線振動條件下振動給料機中物料顆粒的運動理論,以此為基礎,建立了一種適合于球團顆粒運動仿真的摩擦力模型；并通過FORTRAN77編寫用戶子程序將其嵌入到ADAMS中,對復雜振動條件下球團顆粒的運動進行了仿真,分析了偏心引起的振動變化對振動給料機中物料顆粒運動的影響。 結合振動給料機的偏心振動特性及球團顆粒運動規(guī)律,分析了偏心對布料效果的影響,闡釋了偏心造成振動給料機布料不均勻現(xiàn)象的內在機理；進而對偏心狀態(tài)下的振動給料機進行多球團顆粒運動仿真,找到了偏心與振動臺面上球團顆粒的分布狀況之間的聯(lián)系；以此為基礎,提出了兩種糾偏方案,并通過布料試驗進行了驗證。 結果表明,水平方向上的偏心是造成振動給料機布料不均勻現(xiàn)象的根本原因；糾偏后,振動給料機的布料效果得到明顯改善,證明了理論分析的正確性。
[Abstract]:In the direct reduction process of rotary bottom furnace, the thickness and distribution of carbon-bearing pellets on the furnace have a direct effect on the quality and production efficiency of sponge iron. A new type of vibrating feeder has been designed by scholars at home and abroad, which can realize the distribution of equal thickness in the circumference and radial direction of the furnace. However, due to the eccentricity of vibrating feeder, the thickness of the material layer on the furnace will be uneven, which can not meet the requirements of the process. In view of this, this paper takes the vibrating feeder as the research object, and makes a systematic study on the uneven distribution caused by eccentricity. In this paper, the mechanism of this phenomenon is explored from the vibration of the vibrating feeder under eccentric condition and the motion characteristics of the material particles, and the solution is found. Based on the deep analysis of the structure, principle and vibration characteristics of the vibrating feeder, the phenomenon that the action line between the center of mass and the exciting force does not coincide is defined as eccentricity, and the vibration model of the vibration feeder with five degrees of freedom is established. The steady state response in different eccentricity states is solved by mode superposition method, and the relation curve between eccentricity and steady vibration amplitude is obtained by using MATLAB, and the influence of eccentricity on steady state vibration characteristic of vibrating feeder is analyzed. In this paper, the motion theory of material particles in vibrating feeder under linear vibration is derived. Based on this theory, a friction force model suitable for pellet motion simulation is established, and embedded in ADAMS by user subprogram written by FORTRAN77. The movement of pellets under complex vibration conditions is simulated and the effect of eccentricity on the movement of particles in vibrating feeder is analyzed. Combined with the eccentric vibration characteristics of vibrating feeder and the movement law of pellets, the influence of eccentricity on the distribution effect is analyzed, and the internal mechanism of uneven distribution caused by eccentricity is explained. Then, the motion simulation of multi-pellet particles is carried out on the vibrating feeder in eccentric state, and the relation between eccentricity and the distribution of pellet particles on the vibrating table is found, and two kinds of rectifying schemes are put forward. It is verified by cloth test. The results show that the eccentricity in the horizontal direction is the fundamental cause of the uneven distribution of the vibrating feeder, and the distribution effect of the vibrating feeder is obviously improved after rectifying the deviation, which proves the correctness of the theoretical analysis.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH237.1
本文編號：2165985
[Abstract]:In the direct reduction process of rotary bottom furnace, the thickness and distribution of carbon-bearing pellets on the furnace have a direct effect on the quality and production efficiency of sponge iron. A new type of vibrating feeder has been designed by scholars at home and abroad, which can realize the distribution of equal thickness in the circumference and radial direction of the furnace. However, due to the eccentricity of vibrating feeder, the thickness of the material layer on the furnace will be uneven, which can not meet the requirements of the process. In view of this, this paper takes the vibrating feeder as the research object, and makes a systematic study on the uneven distribution caused by eccentricity. In this paper, the mechanism of this phenomenon is explored from the vibration of the vibrating feeder under eccentric condition and the motion characteristics of the material particles, and the solution is found. Based on the deep analysis of the structure, principle and vibration characteristics of the vibrating feeder, the phenomenon that the action line between the center of mass and the exciting force does not coincide is defined as eccentricity, and the vibration model of the vibration feeder with five degrees of freedom is established. The steady state response in different eccentricity states is solved by mode superposition method, and the relation curve between eccentricity and steady vibration amplitude is obtained by using MATLAB, and the influence of eccentricity on steady state vibration characteristic of vibrating feeder is analyzed. In this paper, the motion theory of material particles in vibrating feeder under linear vibration is derived. Based on this theory, a friction force model suitable for pellet motion simulation is established, and embedded in ADAMS by user subprogram written by FORTRAN77. The movement of pellets under complex vibration conditions is simulated and the effect of eccentricity on the movement of particles in vibrating feeder is analyzed. Combined with the eccentric vibration characteristics of vibrating feeder and the movement law of pellets, the influence of eccentricity on the distribution effect is analyzed, and the internal mechanism of uneven distribution caused by eccentricity is explained. Then, the motion simulation of multi-pellet particles is carried out on the vibrating feeder in eccentric state, and the relation between eccentricity and the distribution of pellet particles on the vibrating table is found, and two kinds of rectifying schemes are put forward. It is verified by cloth test. The results show that the eccentricity in the horizontal direction is the fundamental cause of the uneven distribution of the vibrating feeder, and the distribution effect of the vibrating feeder is obviously improved after rectifying the deviation, which proves the correctness of the theoretical analysis.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TH237.1
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