本文選題：割刀傳動 + 行星齒輪機構(gòu)�。� 參考：《西北農(nóng)林科技大學(xué)》2011年碩士論文

【摘要】：割刀傳動機構(gòu)是聯(lián)合收割機的重要部件,其工作性能直接影響著聯(lián)合收割機作業(yè)的質(zhì)量和效率。目前國內(nèi)的聯(lián)合收割機上大多采用的是曲柄連桿機構(gòu)、擺環(huán)機構(gòu)。其共同缺點是:刀桿受到垂直或水平方向的分力,導(dǎo)致刀桿易造成斷裂。而行星齒輪式傳動機構(gòu)的結(jié)構(gòu)特點是刀桿頭不受垂直方向的分力和前后水平分力作用,因而磨損小,振動也小,結(jié)構(gòu)緊湊,工作可靠。至今,世界上只有Deutz-Fahr聯(lián)合收割機上的割刀采用了行星齒輪傳動機構(gòu),對其研究、設(shè)計極少。因此,設(shè)計、研究行星齒輪割刀傳動就十分必要。 針對割刀的擺環(huán)傳動機構(gòu)使刀桿受到垂直分力的作用,導(dǎo)致刀桿受到振動和易斷裂的缺點,本文利用優(yōu)化設(shè)計的手段,設(shè)計了聯(lián)合收割機行星齒輪傳動機構(gòu),并對所設(shè)計的機構(gòu)的合理性與工作可靠性進行了分析與驗證。 應(yīng)用Matlab軟件的優(yōu)化工具箱,對聯(lián)合收割機行星齒輪傳動機構(gòu)進行優(yōu)化設(shè)計;以所得的優(yōu)化參數(shù)用三維機械設(shè)計軟件Pro/E完成了虛擬裝配和運動學(xué)仿真;再把模型導(dǎo)入到有限元分析軟件ANSYS中,按照行星齒輪傳動機構(gòu)的特點和實際工作條件,對行星齒輪進行了彎曲靜力分析,求證設(shè)計的合理性。 全文的研究內(nèi)容和結(jié)果如下: (1)以東方紅4LZ-2.5聯(lián)合收割機的割刀傳動機構(gòu)為例,分析了現(xiàn)有的擺環(huán)箱傳動機構(gòu)的運動規(guī)律,同時分析行星齒輪傳動機構(gòu)的運動特性,得到了行星齒輪傳動機構(gòu)要滿足割刀的往復(fù)直線運動,各零部件尺寸要滿足的條件。 (2)以體積最小為目標函數(shù),以滿足能實現(xiàn)割刀運動的尺寸條件、滿足行星齒輪設(shè)計過程中的尺寸條件、滿足額定承載能力條件等為約束條件,建立行星齒輪傳動機構(gòu)優(yōu)化設(shè)計的數(shù)學(xué)模型。 (3)采用基于Matlab的遺傳算法工具箱對目標函數(shù)進行優(yōu)化,得到行星齒輪傳動機構(gòu)的幾何參數(shù)的最佳組合,根據(jù)實際情況圓整優(yōu)化結(jié)果。 (4)在Pro/E軟件中,完成行星齒輪傳動機構(gòu)3D造型和虛擬裝配,檢驗零件尺寸的正確性。運用Pro/E軟件的運動仿真功能,對設(shè)計的行星齒輪機構(gòu)執(zhí)行接近實際狀況的運動仿真測試,得到割刀的運動曲線,和東方紅4LZ-2.5聯(lián)合收割機現(xiàn)有傳動系統(tǒng)下的割刀運動做比較,驗證設(shè)計的合理性。 (5)根據(jù)行星齒輪傳動機構(gòu)處于低速重載工況條件,針對優(yōu)化設(shè)計后的齒輪進行彎曲強度有限元分析,驗證優(yōu)化設(shè)計結(jié)果的正確性。 研究結(jié)果表明:本文所優(yōu)化設(shè)計的行星齒輪機構(gòu),經(jīng)Pro/E軟件運動仿真的檢驗知,與東方紅4LZ-2.5聯(lián)合收割機現(xiàn)有傳動機構(gòu)的運動相近,得出其設(shè)計尺寸可行;經(jīng)有限元彎曲應(yīng)力的分析,知所設(shè)計的齒輪滿足強度要求。繼一系列的CAD,CAE技術(shù)的設(shè)計、檢驗之后,知本文所設(shè)計聯(lián)合收割機的行星齒輪傳動機構(gòu)提高了工作性能和可靠性。從而從根本上改善了收割機割刀的受力狀況,解決了刀桿斷裂問題,提高了聯(lián)合收割機的工作效率。
[Abstract]:Cutter drive mechanism is an important part of combine harvester, and its working performance directly affects the quality and efficiency of combine harvester operation. At present, crank linkage mechanism and pendulum ring mechanism are mostly used in combine harvester in our country. The common disadvantage is that the pole is easily broken by vertical or horizontal force. The structure of the planetary gear-type transmission mechanism is characterized by the fact that the blade head is not subjected to vertical and horizontal forces, so the wear is small, the vibration is small, the structure is compact, and the work is reliable. Up to now, only the cutter of Deutz-Fahr combine machine adopts planetary gear transmission mechanism. Therefore, it is necessary to design and study the planetary gear cutter transmission. Aiming at the shortcoming that the shimmy ring drive mechanism of cutting tool causes the cutter rod to be subjected to vertical force, which leads to the vibration and breakage of the cutter rod, this paper designs the planetary gear transmission mechanism of combine harvester by means of optimization design. The rationality and reliability of the designed mechanism are analyzed and verified. The optimal design of planetary gear transmission mechanism of combine harvester is carried out by using the optimization toolbox of Matlab software, and the virtual assembly and kinematics simulation are completed by using 3D mechanical design software Pro/E. Then the model is introduced into the finite element analysis software ANSYS. According to the characteristics of the planetary gear transmission mechanism and the actual working conditions, the bending static analysis of the planetary gear is carried out, and the rationality of the design is verified. The research contents and results are as follows: Taking the cutter drive mechanism of Dongfanghong 4LZ-2.5 combine harvester as an example, this paper analyzes the motion law of the existing swing ring box transmission mechanism, and analyzes the motion characteristics of the planetary gear transmission mechanism at the same time. The conditions that the planetary gear transmission mechanism should meet the reciprocating straight motion of the cutter and the dimensions of each component should be satisfied are obtained. (2) taking the minimum volume as the objective function, to satisfy the size condition which can realize the movement of the cutter, to satisfy the dimension condition in the design process of the planetary gear, and to satisfy the condition of the rated bearing capacity, etc. A mathematical model for optimal design of planetary gear transmission mechanism is established. 3) the objective function is optimized by genetic algorithm toolbox based on Matlab, and the optimal combination of geometric parameters of planetary gear transmission mechanism is obtained. In Pro/E software, the 3D modeling and virtual assembly of planetary gear transmission mechanism are completed, and the correctness of the dimensions of the parts is verified. Using the motion simulation function of Pro/E software, the kinematic simulation test of the designed planetary gear mechanism is carried out, and the motion curve of the cutter is obtained, which is compared with the movement of the cutting tool under the existing drive system of the Dongfanghong 4LZ-2.5 combine harvester. Verify the rationality of the design. 5) according to the condition that the planetary gear transmission mechanism is in low speed and heavy load condition, the bending strength of the gear after optimized design is analyzed by finite element method, and the correctness of the optimized design result is verified. The results show that the planetary gear mechanism optimized in this paper is close to the motion of the existing drive mechanism of Dongfanghong 4LZ-2.5 combine harvester by Pro/E software motion simulation, and the design size is feasible. Through the finite element analysis of bending stress, it is known that the designed gear meets the strength requirement. After a series of design and inspection of CAE technology, it is known that the planetary gear transmission mechanism of the combine harvester designed in this paper has improved the working performance and reliability. Thus, the mechanical condition of the cutter is improved fundamentally, the problem of cutter pole fracture is solved, and the working efficiency of combine harvester is improved.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH132.41

【引證文獻】

相關(guān)碩士學(xué)位論文 前1條

1 楊夫勇;回轉(zhuǎn)耕耘機變速箱主要零件的有限元分析及優(yōu)化設(shè)計[D];西北農(nóng)林科技大學(xué);2012年

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本文編號：1861714