新型双啮合针齿凸轮分度机构研究

发布时间：2018-10-13 18:12

【摘要】：分度凸轮机构是实现自动化机械生产中所需的间歇运动的常用机构,其在食品、药品、印刷等行业得到广泛的应用。为适应自动机械对高速化、大分度数分度运动的要求,本文提出了新型双啮合针齿凸轮分度机构。该机构可实现较大的分度数而且结构紧凑具,有广阔的应用前景。首先,本文对新型双啮合针齿凸轮分度机构的传动原理进行了阐述,定义了主要设计参数,设计了机构的结构形式。并建立了凸轮、内摆线轮廓线的方程,利用Matlab绘制了凸轮、内摆线轮廓线。讨论主要参数对凸轮廓线的影响。并在上述研究的基础上,应用三维设计软件Pro/e,通过计算出的凸轮、内摆线轮曲线坐标点,完成机构主要部件的三维建模。同时应用Pro/e Mechanism模块对机构进行运动仿真与分析,验证其传动原理的可行性。其次,对针齿与凸轮、内摆线轮之间的受力进行了分析。建立变形协调条件,对针齿在啮合点处作用力的力臂进行分析。结合凸轮与针齿的啮合状态,利用Matlab计算了在任意时刻凸轮、内摆线轮的压力角和针齿啮合点处的作用力大小。对一些参数对压力角及机构受力的影响进行了一定的分析。并计算了针齿与凸轮、内摆线轮之间的接触应力,为本机构的机构设计和相关参数的选取提供了理论依据。最后,设计本机构样机的具体结构。在综合考虑前面工作结论的基础上确定样机的参数,设计全部零件,并在Pro/e中进行了虚拟装配,对整体机构进行干涉检查,便于及时发现设计缺陷。对整机进行平衡设计,推导平衡配重的计算公式,实现惯性力(矩)的平衡。应用Adams对机构进行了仿真求得机构输出速度曲线与理论一致。最后,对样机进行加工试制,并进行了运转。
[Abstract]:Indexing cam mechanism is commonly used to realize intermittent motion in automatic mechanical production. It is widely used in food, medicine, printing and other industries. In order to meet the requirements of high speed and large degree indexing of automatic machinery, a new double meshing needle cam indexing mechanism is proposed in this paper. This mechanism can achieve a large degree and compact structure, and has a broad application prospect. Firstly, this paper describes the transmission principle of the new double engagement needle cam indexing mechanism, defines the main design parameters, and designs the structure of the mechanism. The equations of cam and cycloid contour are established, and the cam and inner cycloid contour are plotted by Matlab. The influence of main parameters on the profile of the cam is discussed. On the basis of the above research, the 3D modeling of the main components of the mechanism is completed by using the 3D design software Pro/e, by calculating the coordinate points of the cam and the curve of the cycloid wheel. At the same time, the Pro/e Mechanism module is used to simulate and analyze the mechanism to verify the feasibility of its driving principle. Secondly, the force between the needle tooth and the cam and the inner cycloid wheel is analyzed. The deformation coordination condition is established and the force arm of the needle teeth acting on the meshing point is analyzed. Combined with the meshing state of the cam and the needle tooth, the pressure angle of the cam and the pressure angle of the cycloid wheel and the force at the engagement point of the needle tooth at any time are calculated by Matlab. The influence of some parameters on pressure angle and mechanical force is analyzed. The contact stress between the needle tooth and the cam and the inner cycloid wheel is calculated, which provides a theoretical basis for the mechanism design and the selection of the related parameters. Finally, the structure of the prototype is designed. On the basis of synthetically considering the conclusions of the previous work, the parameters of the prototype are determined, all the parts are designed, and virtual assembly is carried out in Pro/e to check the interference of the whole mechanism so as to find the design defects in time. The balance design of the whole machine is carried out, and the calculation formula of balance and counterweight is deduced to realize the balance of inertia force (moment). The output velocity curve of the mechanism obtained by Adams simulation is in agreement with the theory. Finally, the prototype was manufactured and operated.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH112.2

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