【摘要】：針對目前現(xiàn)有的煙稈拔取裝置體積結(jié)構(gòu)較大、功能單一、聯(lián)合作業(yè)及對南方煙區(qū)地形地貌適應(yīng)性不強等問題,研究設(shè)計了一種結(jié)構(gòu)緊湊、操作方便、聯(lián)合作業(yè)較強、適合南方煙區(qū)的煙草拔稈切蔸裝置。該裝置是實現(xiàn)南方煙草生產(chǎn)全程機械化的重要組成部分,對提高生產(chǎn)效率、降低勞動強度及成本具有重要意義。本文對南方煙區(qū)地形地貌、煙草種植農(nóng)藝要求進行了研究,對成熟期的煙稈物理力學(xué)特性進行了測量與測試,得出了其平均高度、直徑、質(zhì)量、夾持部位平均直徑、切蔸部位平均直徑、煙稈夾持部位軸向拉斷力與抗拉強度、煙稈夾持部位徑向壓潰力與抗壓強度、煙稈切蔸部位彎曲力與彎曲強度及煙稈與鋼的摩擦系數(shù)。提出了夾持拉拔與切割相結(jié)合的拔稈切蔸方案,并用PRO/E軟件建立了虛擬樣機模型,對其關(guān)鍵部件的結(jié)構(gòu)進行了設(shè)計計算,同時建立了裝置在拔稈切蔸過程中的運動學(xué)與動力學(xué)模型。本文利用ADAMS軟件建立了煙稈-拔稈切蔸裝置虛擬樣機模型,對煙稈夾持拔取與切蔸過程進行了物流過程虛擬試驗分析,得到了裝置在虛擬作業(yè)過程中,煙稈夾持點位移、速度、加速度、煙稈夾持力的變化特征及圓鋸切刀刀刃位移、速度、加速度、動靜軌跡變化規(guī)律,得到了圓鋸切刀在切蔸過程中與煙稈切割作用力的變化規(guī)律。通過前期試驗驗證,對拔稈切蔸裝置發(fā)現(xiàn)的問題進行了改進。在改進的基礎(chǔ)上進行單因素與多因素正交試驗,確定了影響裝置拔稈切蔸效果的各因素水平的最優(yōu)組合,即雙排夾持輸送鏈速度為0.8m/s、機器前進速度為0.6m/s、夾持間隙為12mmm時,煙稈拔稈切蔸效果最佳。
[Abstract]:Aiming at the problems of large volume structure, single function, combined operation and weak adaptability to topography and geomorphology of the existing tobacco culm extraction device, a compact structure, convenient operation and strong joint operation are studied and designed. Tobacco stalk cutting plant suitable for southern tobacco area. The device is an important part of realizing the whole process mechanization of tobacco production in southern China. It is of great significance to improve the production efficiency and reduce the labor intensity and cost. In this paper, the topographic features and agronomic requirements of tobacco planting in southern tobacco region were studied, and the physical and mechanical properties of tobacco stalk in mature stage were measured and tested. The average height, diameter, mass and mean diameter of holding position were obtained. The mean diameters of the stump, the axial tensile force and tensile strength of the tobacco stalk holding position, the radial crushing force and the compressive strength of the tobacco stalk clamping part, the bending force and the bending strength of the tobacco stalk cutting stump and the friction coefficient between the tobacco stalk and steel. The scheme of culm cutting with clamping drawing and cutting is put forward, and the virtual prototype model is established with PRO/E software, and the structure of its key components is designed and calculated. At the same time, the kinematics and dynamics model of the device in the process of culm cutting was established. In this paper, the virtual prototype model of tobacco-culm-cutting plant was established by using ADAMS software, and the virtual test of the process of culm pulling and stump cutting was carried out, and the displacement and speed of the holding point of tobacco culm in the process of virtual operation were obtained. The variation characteristics of the acceleration, the holding force of tobacco stalk and the displacement, velocity, acceleration, dynamic and static track of the cutting edge of the circular sawing cutter are obtained, and the variation law of the cutting force between the circular saw cutter and the tobacco stalk in the process of cutting the stalk is obtained. The problems found in the plant of culm cutting and stump cutting were improved through early test and verification. On the basis of the improvement, the orthogonal experiment of single factor and multi-factor was carried out, and the optimum combination of factors affecting the effect of culm cutting was determined, that is, the speed of double row gripping transport chain was 0.8m / s, the speed of machine advance was 0.6m / s, When the holding gap was 12mmm, the best cutting effect was obtained when culm was pulled out.
【學(xué)位授予單位】：湖南農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S225.99

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1 楊彪;煙草拔稈機拔稈切蔸裝置試驗研究[D];湖南農(nóng)業(yè)大學(xué);2015年

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本文編號：2327441