乘坐式高速插秧机后桥机构的研究与设计

发布时间：2018-05-11 01:39

本文选题：高速水稻插秧机 + 齿轮传动　；参考：《山东理工大学》2015年硕士论文

【摘要】：乘坐式高速插秧机采取四轮驱动,后桥工作状况的好坏将直接影响到整个插秧机的行走速度和田间作业质量。齿轮动力学研究的目的是为了优化整个齿轮传动系统,通过动力学方程的模拟更准确的掌握齿轮传动过程中的动力学特性,从而为优化设计、提高齿轮的承载能力和安全性提供有效的理论参考。本文在简单的分析比较国内外水稻插秧机发展过程的基础上,依据机构学原理,采用理论分析与仿真分析相结合的方法,对后桥整体结构和关键部件进行了优化设计。本文主要研究内容及结论如下:(1)在简单的分析比较当前国内外齿轮动力学研究的基础上,利用瑞利法原理推导出了齿轮与轴装配时的等效质量计算公式,并研究探讨了动力学模型建立过程中的相关参数:等效刚度、等效阻尼等。最后通过计算给出了矩阵形式的单级齿轮副动力学模型。对齿轮传动系统进行了深入研究。后桥齿轮传动系统由十个齿轮组成,为保证传动可靠性,对齿轮传动系统关键部件进行了动力学研究,分析了大负荷工况下传动系统受力情况,为设计可靠的齿轮传动系统提供了设计依据。(2)设计了后桥轮边离合器减速制动系统,利用该系统能够完成插秧机左右轮的非同步制动,从而完成插秧机的原地转向,而且可以解决田间工作时动力不足的问题。(3)对本文研究设计的后桥行走系统的关键零部件进行了三维建模和虚拟装配,并对建立的后桥齿轮传动系统进行了ADAMS运动学仿真,通过分析各级齿轮间啮合力的大小、各齿轮的角速度曲线,计算得该齿轮传动系统的传动效率,进一步验证后桥齿轮传动系统设计的合理性。(4)为了了解插秧机后桥齿轮传动过程中,齿轮的振动情况,采用ANSYS有限元分析软件对插秧机后桥齿轮传动系统中的关键齿轮进行模态分析,通过研究其固有频率,并与插秧机田间作业时的实际工况下振动情况相比较,验证了小齿轮设计的可行性,为后桥齿轮传动系统中齿轮的结构优化设计提供理论依据。
[Abstract]:The riding high speed transplanter adopts four wheel drive, and the working condition of the rear axle will directly affect the walking speed of the whole transplanter and the quality of the field operation. The purpose of the gear dynamics research is to optimize the whole gear transmission system, to master the dynamic characteristics of the gear transmission process more accurately through the simulation of the dynamic equation, so as to optimize the design. Improve the bearing capacity and safety of gears to provide an effective theoretical reference. On the basis of simple analysis and comparison of the development process of rice transplanter at home and abroad and according to the principle of mechanism, this paper optimizes the design of the whole structure and key components of the rear axle by combining theoretical analysis with simulation analysis. The main contents and conclusions of this paper are as follows: (1) on the basis of simple analysis and comparison of the current research on gear dynamics at home and abroad, the equivalent mass calculation formula for gear and shaft assembly is derived by using the Rayleigh principle. The parameters such as equivalent stiffness, equivalent damping and so on are discussed. Finally, the dynamic model of single stage gear pair in matrix form is given by calculation. The gear transmission system is studied deeply. The rear axle gear transmission system is composed of ten gears. In order to ensure the transmission reliability, the dynamics of the key parts of the gear transmission system is studied, and the mechanical condition of the transmission system under the heavy load condition is analyzed. This paper provides a design basis for designing reliable gear transmission system. (2) the rear axle wheel side clutch deceleration braking system is designed. The system can be used to complete the non-synchronous braking of the left and right wheels of the transplanter and thus complete the in-situ steering of the transplanter. The key parts of the rear axle walking system studied and designed in this paper are modeled and virtual assembled, and the ADAMS kinematics simulation of the rear axle gear transmission system is carried out. The transmission efficiency of the gear transmission system is calculated by analyzing the meshing force between different gears and the angular velocity curve of each gear. Further verify the rationality of the design of rear axle gear transmission system in order to understand the vibration of the gear during the transmission process of the rear axle gear of the rice transplanter, The modal analysis of the key gears in the rear axle gear transmission system of rice transplanter was carried out by using ANSYS finite element analysis software. The natural frequency of the gear was studied and compared with the vibration under the actual working conditions of the transplanter in the field operation. The feasibility of pinion design is verified, which provides a theoretical basis for the optimization design of gear structure in rear axle gear transmission system.
【学位授予单位】：山东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S223.91

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