给定6R闭链的八杆机构四位置综合

发布时间：2018-01-03 06:01

本文关键词：给定6R闭链的八杆机构四位置综合　出处：《农业机械学报》2016年09期 　论文类型：期刊论文

【摘要】：在给定6R闭链上添加2个RR杆形成32种单自由度八杆机构。首先依据扩展布氏曲线理论求出解曲线,在解曲线上添加2个RR杆得到了所要综合的八杆机构。由于解曲线上的每一点都可以作为添加RR杆的点,因此可以得到无穷多解。通过把解曲线进行变换可以得到表示无穷多解的解平面,称为解域。根据闭链上添加的两个RR杆是否相关,把解域分为2类。采用杆组法对机构进行分类并进行运动分析。根据机构是否能顺序通过给定闭链的4个位置判断机构是否有缺陷,去掉解域中有缺陷的机构就得到了机构的可行解域。在可行解域中,根据机构的原动件可转动的角度范围,将原动件为曲柄和非曲柄的机构进行区分。解域综合方法可使设计者能更直观、准确地选择满足要求的机构,提高了设计效率。最后,通过一个八杆机构的综合示例具体说明了该类四位置综合的过程及结果。
[Abstract]:32 kinds of single-degree-of-freedom eight-bar mechanisms are formed by adding two RR rods to a given 6R closed chain. Firstly, the solution curve is obtained according to the theory of extended Brinell curve. Two RR rods are added to the solution curve to obtain the eight bar mechanism to be synthesized, since each point on the solution curve can be used as the point of adding RR bar. By transforming the solution curve, we can get the solution plane representing the infinite solution, which is called solution domain. According to the correlation of the two RR rods added on the closed chain, we can get the infinite solution. The solution domain is divided into two categories. The mechanism is classified and analyzed by pole group method. According to whether the mechanism can be sequentially passed through the four positions of the given closed chain, the mechanism is judged whether it has defects or not. The mechanism with defects in the solution domain is removed and the feasible solution domain is obtained. In the feasible solution domain, according to the angle range of rotation of the original moving part of the mechanism. The original movement is divided into crank and non-crank mechanism. The solution domain synthesis method can make the designer choose the mechanism that meets the requirements more intuitively and accurately, and improve the design efficiency. Finally. A synthesis example of eight bar mechanism is given to illustrate the process and result of this kind of four-position synthesis.
【作者单位】：北京科技大学机械工程学院;
【基金】：国家自然科学基金项目(51275034)
【分类号】：TH112
【正文快照】： 引言平面四杆机构位置综合问题[1-4]已经得到较多研究,四杆机构及其演化形式在生产实践中也得到了广泛应用。但是,随着科学技术的发展,机构综合研究水平的提高,多杆机构的应用研究亦日益增多,例如,Watt-Ia型六杆转向机构、单自由度的六杆和八杆机构手指的应用可能性研究[5-7],

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