本文選題：茶園 + 撒肥裝置��； 參考：《江蘇大學》2016年碩士論文

【摘要】：目前茶園中尚無專用的施肥裝備,而傳統(tǒng)的大田撒肥裝置不適于在窄行距的茶園中作業(yè);茶園中常用的施肥方式主要依靠人力,勞動效率低、強度高。因此,研制一種茶園專用的高效施肥裝置,具有重要的實際意義。本論文在農(nóng)業(yè)部公益性行業(yè)(農(nóng)業(yè))科研專項“茶園綜合作業(yè)機械化技術與裝備研究”項目資助下,基于離心撒肥裝置的工作過程及其結構分析,在測定肥料顆粒力學參數(shù)及分析其運動的基礎上,對撒肥過程進行仿真;然后通過臺架試驗研究優(yōu)化撒肥工作參數(shù),并進行了田間驗證。主要研究內(nèi)容與結果如下:(1)茶樹專用肥料顆粒力學參數(shù)測定為了建立準確真實的肥料顆粒模型,以茶園中茶樹需求量最大的專用肥料尿素和復合肥為研究對象,分別對其的碰撞恢復系數(shù)、三軸尺寸、密度、剛度系數(shù)、摩擦系數(shù)等參數(shù)進行了測量。測量結果為:尿素顆粒與復合肥的碰撞恢復系數(shù)分別為0.39和0.41;尿素和復合肥的平均長度分別為3.80 mm和3.42 mm,平均寬度分別為3.57 mm和3.21 mm,厚度的均值分別為3.59 mm和3.19 mm,等效直徑的均值分別為3.64 mm和3.27 mm,兩種肥料顆粒球形度均大于93%;尿素和復合肥的顆粒密度分別為顆粒密度為1.61g/cm3和1.10 g/cm3,堆積密度分別為0.75 g/cm3和0.90 g/cm3;肥料顆粒的剛度系數(shù)分別為132.88 N/mm和85.51 N/mm;兩者的靜摩擦系數(shù)為0.59和0.55,動摩擦系數(shù)為0.54和0.41;含水率分別為0.37%和1.10%。(2)撒肥裝置總體設計與肥料顆粒運動分析對茶園撒肥裝置的結構進行總體設計,其中主要包括機架、肥料箱、仿蹄形下料口和葉片位置傾角可調(diào)的偏置式離心盤等部件,同時建立了肥料顆粒在離心盤上和脫離離心盤后的兩種動力學模型,并分析了茶園撒肥的工作過程。其中,仿蹄形下料口既能緩沖肥料顆粒流的速度,又可以避免肥料顆粒的過多的集中于離心盤的中心;離心盤活動葉片既方便調(diào)整來改變?nèi)龇蕦挿?又能夠提高撒肥的均勻性;機架的結構與尺寸根據(jù)手扶拖拉機前端結構尺寸確定,將撒肥裝置固定于手扶拖拉機的前端,在撒肥的同時可使手扶拖拉機后置的旋耕機將所撒肥料覆于土中。(3)離心撒肥過程仿真根據(jù)肥料顆粒的力學參數(shù),建立肥料顆粒的球形模型和撒肥裝置的幾何模型,并確定肥料顆粒的接觸模型和最優(yōu)時間步長;為滿足0.8 m的合適撒肥寬幅,經(jīng)試驗測試知,與之對應的離心盤轉(zhuǎn)速約為300 rpm;通過EDEM仿真茶園撒肥裝置的撒肥過程,初步分析了撒肥裝置行走速度、離心盤葉片個數(shù)、葉片偏置角度等單一因素對顆粒分布變異系數(shù)的影響,同時對肥料顆粒的群體分布、單顆粒速度變化、受力變化情況和位移變化情況進行分析。仿真結果表明:當行走速度為0.6 m/s、偏置角度為30°和葉片個數(shù)為4片時,變異系數(shù)較小,均具有較好的撒肥效果;由肥料顆粒群體分布情況分析可知,撒肥過程中肥料顆粒分布的縱向均勻性較好,橫向均勻性較差;通過肥料顆粒速度、受力及位移變化分析可知,肥料顆粒在通過仿蹄形下料口時,速度急劇減小,受力變大,位移變化緩慢,說明撒肥裝置的下料口起到了緩沖肥料顆粒流速的作用,避免了高速肥料顆粒流對離心盤的沖擊。(4)撒肥效果試驗及工作參數(shù)優(yōu)化由仿真分析可知,當行走速度為0.6 m/s、偏置角度為30°和葉片個數(shù)為4片時,變異系數(shù)均較小,但為探究這三個因素的交互作用對撒肥均勻性的影響以及最優(yōu)的工作參數(shù),采用三因素三水平的二次回歸正交旋轉(zhuǎn)中心組合設計試驗方法進行臺架試驗;根據(jù)試驗數(shù)據(jù)分析的結果,建立起葉片個數(shù)、偏置角度和行走速度關于分布變異系數(shù)的回歸模型;在各因素范圍的約束條件下,對目標函數(shù)進行優(yōu)化;并利用田間試驗對臺架試驗的最優(yōu)結果進行了檢驗。優(yōu)化結果為:葉片個數(shù)為5、偏置角度為15.72o、行走速度為0.61 m/s,此時分布變異系數(shù)達到最小值,為10.30%。田間驗證試驗表明:在最優(yōu)作參數(shù)下,茶園撒肥裝置的撒肥均勻性較好,實測值與理論預測值的平均相對誤差為10.15%,最大相對誤差為22.14%。與未優(yōu)化的撒肥裝置相比,優(yōu)化后的工作參數(shù)對撒肥的均勻性有了顯著提升。本論文設計并研制了一種茶園專用撒肥裝置,并優(yōu)化了其工作參數(shù);臺架與田間試驗表明,該離心撒肥裝置在優(yōu)化的工作參數(shù)下,撒肥均勻性較好,可用于茶園施肥。
[Abstract]:There is no special fertilizer equipment in the tea garden at present, but the traditional field dressing device is not suitable to work in the narrow distance tea garden. The common method of fertilization in the tea garden is mainly dependent on manpower, low labor efficiency and high intensity. Therefore, it is of great practical significance to develop a kind of high efficiency fertilization device for tea garden. This paper is in the public welfare of the Ministry of agriculture. Under the support of the project of "mechanization technology and equipment research of Tea Garden comprehensive operation", based on the analysis of the working process and structure of the centrifugal fertilizer plant, the process is simulated on the basis of determining the mechanical parameters of the fertilizer particles and analyzing the movement of the fertilizer. The main contents and results are as follows: (1) the determination of the mechanical parameters of the special fertilizer for tea tree in order to establish an accurate and true fertilizer particle model, the research object of the special fertilizer urea and compound fertilizer, which have the largest demand for tea trees in the tea garden, and the coefficient of the collision recovery, the size of the three axis, the density and the stiffness system respectively. The results are as follows: the impact recovery coefficient of urea and compound fertilizer is 0.39 and 0.41, respectively, the average length of urea and compound fertilizer is 3.80 mm and 3.42 mm respectively, the average width is 3.57 mm and 3.21 mm respectively, the mean thickness is 3.59 mm and 3.19 mm respectively, the mean diameter of the equivalent is 3.64, respectively. The sphericity of two kinds of fertilizer particles in mm and 3.27 mm is more than 93%. The particle density of urea and compound fertilizer is 1.61g/cm3 and 1.10 g/cm3, respectively, the density is 0.75 g/cm3 and 0.90 g/cm3, respectively. The stiffness coefficient of fertilizer particles is 132.88 N/mm and 85.51 N/mm, respectively, and the static friction coefficient is 0.59 and 0.55, and the dynamic friction coefficient is 0.5. 4 and 0.41, the overall design of the fertilizer plant and the particle motion analysis of the 1.10%. (2) fertilizer, respectively, are designed for the structure of the tea garden fertilizer plant, including the frame, the fertilizer box, the imitating hoof shape and the offset centrifugal disc with adjustable angle of the blade position, and the fertilizer particles are established on the centrifuge disk. The two dynamic models were separated from the centrifuge disc, and the working process of the tea plantation was analyzed. Among them, the imitating hoof shaped cutting mouth can not only buffer the velocity of the fertilizer particle flow, but also avoid the excessive concentration of the fertilizer particles in the center of the centrifuge disk; the active blade of the centrifugal disc can be easily adjusted to change the width of the fertilizer and increase the fertilizer. The structure and size of the frame are determined according to the size of the front structure of the walking tractor, and the fertilizer device is fixed to the front end of the walking tractor, and the fertilizer can be covered with the soil. (3) the process of centrifugation is used to simulate the mechanical parameters of the fertilizer particles and to establish the ball of fertilizer particles. The geometric model and the geometric model of the fertilizer plant are used to determine the contact model of the fertilizer particles and the optimal time step. In order to meet the suitable width of 0.8 m, the rotational speed of the centrifugal disc is about 300 rpm. The walking speed of the fertilizer plant and the centrifugal disc leaf are preliminarily analyzed through the EDEM simulation of the fertilizer passing through the tea garden. The influence of single factor, blade bias angle and single factor on the variation coefficient of particle distribution was analyzed. At the same time, the population distribution of the fertilizer particles, the change of single particle velocity, the change of force and the change of displacement were analyzed. The simulation results show that the coefficient of variation is smaller when the walking speed is 0.6 m/s, the bias angle is 30 degrees and the number of the blade is 4. According to the analysis of the distribution of fertilizer particles, it is known that the vertical uniformity of the fertilizer particle distribution is better and the lateral uniformity is poor during the fertilization process. Through the analysis of the velocity of the fertilizer particle, the change of force and displacement, the velocity of the fertilizer particles decreases rapidly, the force becomes larger and the displacement is larger. The change slows slowly, which indicates that the feeding port of the fertilizer plant has the effect of buffering the flow velocity of the fertilizer particles, avoiding the impact of the high speed fertilizer particle flow on the centrifugal disc. (4) the experiment of the effect of the fertilizer and the optimization of the working parameters show that the coefficient of variation is smaller when the walking speed is 0.6 m/s, the bias angle is 30 and the number of the blade is 4. In order to explore the effect of the interaction of the three factors on the uniformity of fertilization and the optimal working parameters, a bench test was carried out by using the two regression orthogonal rotation center combination design test method with three factors and three levels, and the number of leaves, the bias angle and the walking velocity were established on the basis of the results of the test data. The regression model of number is used to optimize the target function under the constraints of various factors, and the optimal results are tested by field test. The optimization results are as follows: the number of leaves is 5, the bias angle is 15.72o, the walking speed is 0.61 m/s, and the distribution variation coefficient reaches the minimum value at this time, which is 10.30%. field test. It is shown that the fertilizer uniformity of the tea plantation device is better under the optimal parameters. The average relative error of the measured value and the predicted value is 10.15%. The maximum relative error is 22.14%. compared with the non optimized fertilizer plant. The optimized working parameters have improved the uniformity of the fertilizer. This paper has designed and developed a tea garden special. The working parameters of a fertilizer plant were used and its working parameters were optimized, and the bench and field experiments showed that the centrifuge dressing device had better uniformity and could be applied to the tea garden under the optimized working parameters.

【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：S224.2

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