六行宽窄行插秧机栽植机构设计.docx

六行宽窄行插秧机栽植机构设计该题目来源于国家科技支撑计划课题，六行宽窄行插秧机总体设计需根据课题任务的要求进行设计，外观可观，符合设计要求即可。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.步行式插秧机分插机构的优化设计 彭涛 东北农业大学 2013-06-01 硕士 80 分享 分享到2锥齿轮斜置式步行宽窄行插秧机分插机构的分析、设计及试验研究 罗华 浙江理工大学 2011-12-13 硕士 101 分享 分享到3插秧机后插旋转式宽窄行分插机构设计与优化 俞高红; 马成稳; 孙良; 裘利钢; 赵匀 农业机械学报 2012-08-25 期刊 3 90 分享 分享到4斜齿外啮倾斜式宽窄行插秧机分插机构的设计 张允慧; 迟立军; 赵匀; 徐洪广; 朱艺媛 农业工程学报 2012-04-01 期刊 2 142 分享 分享到5步行式偏心变位齿轮行星轮系宽窄行分插机构运动分析 赵匀; 罗华; 蒋鹏鹏; 李殿波; 张允慧; 张国凤; 代丽 农业工程学报 2012-05-01 期刊 5 142 分享 分享到6基于d-h变换矩阵的宽窄行分插机构运动特性分析与设计 孙良; 赵匀; 俞高红; 姚佳明 农业工程学报 2012-03-01 期刊 1 110 分享 分享到7非匀速空间行星轮系宽窄行分插机构分析与优化 孙良; 赵匀; 姚佳明; 郑建; 俞高红; 祝宇 农业机械学报 2012-10-25 期刊 2 88 分享 分享到8组合机构在插秧机分插机构设计中的应用 李德威; 温兆麟 华南农业大学学报 2001-04-30 期刊 4 108 分享 分享到9行距可调插秧机移箱机构的设计与仿真研究 葛俊 安徽农业大学 2012-06-01 硕士 77 分享 分享到10交错轴斜齿轮外啮合倾斜式宽窄行分插机构的设计与研究 张允慧 浙江理工大学 2011-12-13 硕士 52 分享 分享到11斜齿行星轮系后插旋转式宽窄行分插机构的设计与试验研究 马成稳 浙江理工