【作者】 司明理；

【导师】 杨宛章；

【作者基本信息】 新疆农业大学 ， 农业机械化工程， 2007， 硕士

【摘要】 本文分析了目前残膜回收及残膜回收机的现状及存在的主要问题,在气吹式春播前残地膜回收机研究的基础之上,运用可视化虚拟设计、有限元分析、优化、仿真等技术手段,针对机具的核心部件一捡膜弹齿和输送风道进行理论分析和研究,并辅以试验测试验证,为气吹式春播前残地膜回收机的结构工艺及参数设计提供技术依据。为此本课题主要从以下几方面进行了研究:1.通过对机具主要工作部件捡膜弹齿的特性分析,建立了捡膜弹齿工作过程中的运动学和动力学方程,以及捡膜弹齿在捡拾耕层6cm内不漏捡的情况下捡膜弹齿的排列方式;2.通过制作试验台架并进行试验验证,确定了捡拾机构的前排捡膜弹齿后弯,转速1000r/min,后排采用圆盘机构,转速600r/min的较优结构形式,为机具的设计提供了条件;3.运用Msc.Nastran和Msc.Fatigue有限元分析软件,对春播前残地膜回收机的主要工作部件捡膜弹齿进行了静应力、模态和疲劳寿命分析,得到捡膜弹齿的应力云图和疲劳寿命云图,通过仿真分析找出了捡膜弹齿在工作中折断和变形的原因,并进行了优化,为设计提供理论基础;4.通过对输送风道CFD计算流体力学仿真,找道了使气流不顺畅的原因,风道的仰角不能太大,并对模型进行了改进设计;通过以上几方面的内容研究旨在探寻捡膜弹齿和输送风道的最佳结构参数,为气吹式春播前残地膜回收机的研究工作提供重要理论依据。更多还原

【Abstract】 In this paper, the present conditions and the main problems of the existences of the plastic film residue collecting and its collector machine are analyzed. Based on the study of a type of air blast plastic film collector before spring sowing, the study on the key work parts of the spring tooth collection plastic and wind path applying visualized virtual design, finite element analysis, optimization and simulation technologies are conducted. Field investigation has been carried out to provide important references for the structure techniques and parameter design of the type of air blast plastic film collector before spring sowing. For these purposes, mainly study from the following several aspects are conducted in this paper.1. By means of characteristic analysis of the main working parts—spring tooth, the equation of kinematics and dynamics are established, which operates in the cause of collection film; and spring tooth’ arrangement mode which can not leak collection continuously 6cm under the ground.2. By means of execution experiment rack and experiment confirmation, ascertain the better structural shape of spring tooth which front row spring tooth is back curve ,rotate speed is 1000 round per minute and back row is disk, rotate speed is 600 round per minute, all these provide conditions to the machinery design.3. Applying MSC.Nastran and MSC.Fatigue finite element analysis software, this paper analyzed spring tooth with stress, mode and fatigue life analysis, then received stress and fatigue life nephogram. From simulation analysis, we find the causation of the disjunction and distortion of the spring tooth and optimize it, all these provide the theory support to spring tooth’s design.4. Through studying wind path with CFD computational fluid dynamic simulation, we found the reason that air current is not smooth and the air path’ elevation can not too be big, then optimize the model.Through several aspects research, we aim to explore more reasonable structure parameters of the spring tooth and wind path, in order to provide important theory gist to the air blast plastic film collector before spring sowing’ research work.更多还原