六行寬窄行插秧機(jī)栽植機(jī)構(gòu)設(shè)計(jì).docx

六行寬窄行插秧機(jī)栽植機(jī)構(gòu)設(shè)計(jì)該題目來(lái)源于國(guó)家科技支撐計(jì)劃課題，六行寬窄行插秧機(jī)總體設(shè)計(jì)需根據(jù)課題任務(wù)的要求進(jìn)行設(shè)計(jì)，外觀可觀，符合設(shè)計(jì)要求即可。abstracttransplanting of seedlings is a labor intensive operation in the cultivation of rice. it is also a skilled job and involves working with a stooping posture in a puddled field. there exists a need to mechanize this operation. for this purpose the design of a mechanism was carried out following the method of analytical synthesis. a planar four-bar linkage with coupler extension was selected as the basic design. the path generated by the mechanism was plotted on a computer screen. by varying the dimensions of various links in the mechanism different paths of output motion of the coupler point were obtained. the potential link dimensions were identified based on the suitability of the path for picking, conveying and planting of seedlings as well as the return motion. a four-row self-propelled transplanter using the above mechanism and an optimized-planting finger was then developed and tested. the machine transplanting system was found to be technically viable.1. introductionindia is predominantly an agricultural country with rice as one of its main food crop. it produces about 80 million tons rice annually, which is about 22% of the world rice production. culturally, transplanting of young seedlings of 2035 days age in water-inundated field is preferred over direct seeding. the former leads to better yield due to better crop management practices that are possible in a transplanted crop. the operation of transplanting requires large amount of manpower (about 400 man-hour/ha) and the task is very laborious involving working in a stooping posture and moving in muddy field. hence, this is considered as an activity that needs mechanization. mechanization of transplanting facilitates mechanization of subsequent activities also in the production of the crop. the machines that are already successful in japan and korea could not be adopted in india because of economic cost constraints and due to the prevailing cultural practices of this country.n the present investigation a mechanism is designed for the purpose of transplanting rice seedlings. the mechanism is driven at about 40 rpm by an engine. the same engine drives the ground wheels of the transplanter. the velocity ratio between the ground wheel and the crank of the planting mechanism decides the spacing between the plants.1.1. design of planting mechanisms used in power operated transplantersanon. 1 states that most of the planting devices of power operated transplanters can be classified as crank and rocker mechanisms of four-bar linkage. a planting finger, which is a part of the coupler link of the mechanism, separates the seedlings from the seedling tray and places them in the soil. the curve traced by the planting finger may have an influence on the stability of the planted seedlings. the kinematic analysis of the planting mechanisms is considered essential for an understanding of its operation and its further improvements.1.2. design of mechanismerdman and sandor state most mechanism tasks require a single input to be transferred to a single output. therefore, single-degree-of-freedom mechanisms are the forms used most frequently. shigley states that grublers criterion is concerned with the nu mechanism and with the number and kinds of kinematic pairs. it can be used for determining the degree of freedom of a mechanism. erdman and sandor 2 state that analysis techniques can be used to replace costly and time consuming building and testing of physical prototypes in a trial and error design process. analysis techniques generally form a basic part of most synthesis methods. norton 4 states that the four-bar linkage should be among the first solutions to motion control problems to be investigated. the fewest parts that can do the job will usually give the least expensive and most reliable solution. norton states that the grashof condition can be used as a very simple relationship, which predicts the behavior of a four-bar linkage, based on the link lengths. zimmerman states that a four-bar mechanism is physically impossible if one of the links has a length greater than the sum of the other three. hirschhorn states that in a four-bar linkage distinct types of mechanisms could be obtained by inversion. a crank-rocker mechanism is obtained by fixing one of the two links paired with the shortest link. paul suggested that newtonraphson method could used be used to solve the non-linear equations developed for solving the four-bar linkage position problem. zimmermanstates that one basic mechanism design problem for which the four-bar chain can provide solutions is that of finding a point of the coupler of a four-bar mechanism, which describes a path closely approximating the desired one.步行式插秧機(jī)分插機(jī)構(gòu)的優(yōu)化設(shè)計(jì) 彭濤 東北農(nóng)業(yè)大學(xué) 2013-06-01 碩士 80 分享 分享到2錐齒輪斜置式步行寬窄行插秧機(jī)分插機(jī)構(gòu)的分析、設(shè)計(jì)及試驗(yàn)研究 羅華 浙江理工大學(xué) 2011-12-13 碩士 101 分享 分享到3插秧機(jī)后插旋轉(zhuǎn)式寬窄行分插機(jī)構(gòu)設(shè)計(jì)與優(yōu)化 俞高紅; 馬成穩(wěn); 孫良; 裘利鋼; 趙勻 農(nóng)業(yè)機(jī)械學(xué)報(bào) 2012-08-25 期刊 3 90 分享 分享到4斜齒外嚙傾斜式寬窄行插秧機(jī)分插機(jī)構(gòu)的設(shè)計(jì) 張?jiān)驶? 遲立軍; 趙勻; 徐洪廣; 朱藝媛 農(nóng)業(yè)工程學(xué)報(bào) 2012-04-01 期刊 2 142 分享 分享到5步行式偏心變位齒輪行星輪系寬窄行分插機(jī)構(gòu)運(yùn)動(dòng)分析 趙勻; 羅華; 蔣鵬鵬; 李殿波; 張?jiān)驶? 張國(guó)鳳; 代麗 農(nóng)業(yè)工程學(xué)報(bào) 2012-05-01 期刊 5 142 分享 分享到6基于d-h變換矩陣的寬窄行分插機(jī)構(gòu)運(yùn)動(dòng)特性分析與設(shè)計(jì) 孫良; 趙勻; 俞高紅; 姚佳明 農(nóng)業(yè)工程學(xué)報(bào) 2012-03-01 期刊 1 110 分享 分享到7非勻速空間行星輪系寬窄行分插機(jī)構(gòu)分析與優(yōu)化 孫良; 趙勻; 姚佳明; 鄭建; 俞高紅; 祝宇 農(nóng)業(yè)機(jī)械學(xué)報(bào) 2012-10-25 期刊 2 88 分享 分享到8組合機(jī)構(gòu)在插秧機(jī)分插機(jī)構(gòu)設(shè)計(jì)中的應(yīng)用 李德威; 溫兆麟 華南農(nóng)業(yè)大學(xué)學(xué)報(bào) 2001-04-30 期刊 4 108 分享 分享到9行距可調(diào)插秧機(jī)移箱機(jī)構(gòu)的設(shè)計(jì)與仿真研究 葛俊 安徽農(nóng)業(yè)大學(xué) 2012-06-01 碩士 77 分享 分享到10交錯(cuò)軸斜齒輪外嚙合傾斜式寬窄行分插機(jī)構(gòu)的設(shè)計(jì)與研究 張?jiān)驶?浙江理工大學(xué) 2011-12-13 碩士 52 分享 分享到11斜齒行星輪系后插旋轉(zhuǎn)式寬窄行分插機(jī)構(gòu)的設(shè)計(jì)與試驗(yàn)研究 馬成穩(wěn) 浙江理工