本文選題：精密播種 + 前后分置��； 參考：《吉林農(nóng)業(yè)大學》2017年碩士論文

【摘要】：隨著我國玉米種植技術(shù)和精密播種技術(shù)的迅速發(fā)展,精密播種機械各工作部件的設計和完善變得尤為重要,新裝置、新原理在精密播種機具上的應用和開發(fā)也更加迫切。精密播種不僅需要排種器投種精確,在株距、行距、單粒播種方面達到精度要求,同時也要求影響種子分布均勻性以及播種深度一致性的覆土器在結(jié)構(gòu)和性能方面滿足要求,有利于種子初期的生長發(fā)育和后期的水肥汲取、光和作用等,有利于提高作物產(chǎn)量。基于降低覆土過程中土壤對種子的沖擊、減小種子的位移、提高種子分布均勻性和覆土厚度一致性的目的,本文設計了一種前后分置圓盤式新型覆土器,使兩組圓盤的覆土量等同于傳統(tǒng)一組圓盤的覆土量,避免了一次性覆土量過大使種子產(chǎn)生較大位移的弊端,前端的一組小覆土盤先用少量潮濕土壤覆蓋于種子表面,完成第一次覆土,再由后端的大覆土盤完成第二次覆土。由于第一次覆土時覆土量小,對種子沖擊小,因而種子位移變化量小,而二次覆土過程中只會對一次覆土完成后形成的土壤表面產(chǎn)生沖擊,種子不會發(fā)生位移,既滿足了覆土厚度要求又改善了覆土質(zhì)量,為種子萌發(fā)提了供良好的土壤環(huán)境,更適于精密播種的技術(shù)要求。本文運用SolidWorks軟件建立了前后分置圓盤式覆土器的三維模型,利用有機玻璃等材料完成了覆土器實體的加工制作。按照均勻試驗設計方法進行了前后分置圓盤式覆土器的土槽試驗,通過對土槽試驗的數(shù)據(jù)分析得出前后分置圓盤式覆土器的最優(yōu)結(jié)構(gòu)參數(shù)以及覆土厚度和種子位移的回歸方程Y1和Y2:Y_1=58.5+0.4A+1.28B+0.7C+0.15D+0.15AB-0.44AC-0.25AD-0.42BC+0.18BD-0.21CD+0.3A~2-0.34B~2-0.009625C~2-0.6D~2Y_2=4.39+1.03A+0.25B+0.14C+0.14AB-0.22AC+0.0075BC-0.095A~2+0.047B~2+0.075C~2回歸方程Y1中A、B、C、D分別代表小圓盤直徑、大圓盤直徑、覆土偏距、圓盤張角,回歸方程Y2中A、B、C分別代表小圓盤直徑、大圓盤直徑、圓盤張角。本文運用EDEM離散元軟件對最優(yōu)覆土器的覆土過程進行仿真分析,仿真分析結(jié)果與土槽試驗結(jié)果基本一致,驗證了利用離散元軟件進行覆土過程仿真分析的可行性,為精密播種機研究與設計提供了新方法,進一步豐富了精密播種技術(shù)與理論。
[Abstract]:With the rapid development of maize planting technology and precision seeding technology in China, the design and improvement of the working parts of precision seeding machinery becomes particularly important, and the application and development of new equipment and new principles in precision planter are more urgent. Precision seeding requires not only the precision of seeding device, but also the structure and performance of mulch, which affects the uniformity of seed distribution and sowing depth, and meets the requirements of precision in plant spacing, row spacing and single seeding. It is beneficial to the initial growth and development of seed, the absorption of water and fertilizer, light and effect, and the increase of crop yield. In order to reduce the impact of soil on seeds, reduce the displacement of seeds, and improve the uniformity of seed distribution and the consistency of soil thickness, a new type of soil cladding device was designed in this paper. The amount of soil covered by two groups of disks is equal to that of a traditional group of disks, which avoids the drawback that the amount of soil covering over the ambassadorial seed produces a large displacement at one time, and a group of small soil covers in the front end cover the surface of the seed with a small amount of wet soil first. Complete the first soil cover, and then the back end of the large earth cover plate to complete the second soil cover. Because of the small amount of soil covering and the small impact on the seed during the first time, the change of the displacement of the seed is small. However, in the process of the second soil covering, the surface of the soil formed after the completion of the first cover will only be impacted, and the seed will not shift. It not only meets the requirements of covering soil thickness but also improves the quality of soil covering. It provides a good soil environment for seed germination and is more suitable for precision seeding. In this paper, SolidWorks software is used to set up the three-dimensional model of the front and rear dissected disc cladding, and the processing and manufacture of the earth-cladding entity is accomplished by using organic glass and other materials. According to the uniform test design method, the soil trough test of the front and rear dissected disc cladding device was carried out. The optimum structural parameters and the regression equations Y1 and Y2:Y_1=58.5 0.4A 1.28B 0.7C 0.15D 0.15AB-0.44AC-0.25AD-0.42BC 0.18BD-0.21CD 0.3A~2-0.34B~2-0.009625C~2-0.6D~2Y_2=4.39 1.03A 0.25B 0.14C 0.14AB-0.22AC 0.0075BC-0.095A~2 0.047B~2 0.075C~2 regression equation Y1 and Y2:Y_1=58.5 0.4A 1.28B 0.7C 0.15D 0.15AB-0.44AC-0.25AD-0.42BC 0.18BD-0.21CD 0.3A~2-0.34B~2-0.009625C~2-0.6D~2Y_2=4.39 1.03A 0.25B 0.14C regression equation Y1 are obtained by analyzing the data of soil trough test. The diameter of the small disk is represented by the Agna Bu Con D, which is the diameter of the small disc. Large disc diameter, overlying offset, disc angle, and A _ (B) C in regression equation Y _ 2 represent small disc diameter, large disc diameter and disc angle respectively. In this paper, the EDEM discrete element software is used to simulate and analyze the soil overburden process of the optimal overburden. The simulation results are basically consistent with the results of the soil trough test, which verifies the feasibility of the simulation analysis of the soil covering process using the discrete element software. It provides a new method for the research and design of precision planter and further enriches the technology and theory of precision seeding.
【學位授予單位】：吉林農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：S223.2

【參考文獻】

相關期刊論文 前10條

1 黃閃閃;李江;朱瑞祥;付作立;翟長遠;時永;;膜上移栽機穴覆土機構(gòu)設計[J];農(nóng)機化研究;2016年07期

2 紀超;陳學庚;陳金成;王士國;赫鵬亮;;玉米免耕精量播種機排種質(zhì)量監(jiān)測系統(tǒng)[J];農(nóng)業(yè)機械學報;2016年08期

3 方自強;胡國明;李婉婉;劉麗萍;;挖掘機鏟斗挖掘過程的DEM仿真分析[J];工程機械;2016年03期

4 崔紅梅;陳福德;杜文亮;;可調(diào)窩眼式玉米精密排種器排種性能試驗研究[J];農(nóng)機化研究;2014年04期

5 崔紅梅;陳福德;杜文亮;;氣吸式玉米精密排種器排種性能試驗研究[J];農(nóng)機化研究;2014年03期

6 崔濤;劉佳;楊麗;張東興;張瑞;藍薇;;基于高速攝像的玉米種子滾動摩擦特性試驗與仿真[J];農(nóng)業(yè)工程學報;2013年15期

7 吉俊寶;樊啟洲;張衍林;;基于微型開溝機的施肥覆土裝置設計[J];華中農(nóng)業(yè)大學學報;2013年04期

8 隋華;;玉米精密播種技術(shù)[J];天津農(nóng)林科技;2013年03期

9 張繼成;陳海濤;歐陽斌林;紀文義;;基于光敏傳感器的精密播種機監(jiān)測裝置[J];清華大學學報(自然科學版);2013年02期

10 胡軍;馬旭;;基于ADAMS的精密播種機的運動仿真研究[J];中國農(nóng)機化;2012年03期

相關博士學位論文 前4條

1 王景立;精密播種機覆土與鎮(zhèn)壓過程對種子觸土后位置控制的研究[D];吉林大學;2012年

2 齊濤;中國玉米國際競爭力研究[D];西北農(nóng)林科技大學;2011年

3 周海波;水稻秧盤育秧精密播種機的關鍵技術(shù)研究與應用[D];吉林大學;2009年

4 張銳;基于離散元細觀分析的土壤動態(tài)行為研究[D];吉林大學;2005年

相關碩士學位論文 前8條

1 姜珊珊;基于離散元法的開溝器試驗研究[D];吉林農(nóng)業(yè)大學;2014年

2 心男;基于EDEM-FLUENT耦合的氣吹式排種器工作過程仿真分析[D];吉林大學;2013年

3 李海燕;基于EDEM的垂直螺旋輸送機性能參數(shù)仿真研究[D];太原科技大學;2011年

4 錢立彬;基于離散元法的開溝器的數(shù)字化設計方法研究[D];吉林大學;2008年

5 常在;土的顆粒力學理論及數(shù)值模擬[D];清華大學;2008年

6 鄭送軍;精密播種機排種器自動監(jiān)測系統(tǒng)研究[D];西北農(nóng)林科技大學;2007年

7 潘力;提升吉林省玉米產(chǎn)業(yè)競爭力的對策研究[D];中國農(nóng)業(yè)科學院;2007年

8 金漢學;基于高速攝像技術(shù)的水稻芽播精密排種器研究[D];吉林大學;2004年

，

本文編號：1978619