一种新型凸轮—连轩组合分度机构的设计与研究
发布时间：2018-11-01 11:02
【摘要】：本文围绕自动化机械实现高速分度的工程需求，提出一种新型的凸轮-连杆组合分度机构。该机构在输入轴回转一周过程中，输出轴可实现多次分度；并且采用输入、输出同轴的五杆机构与共轭凸轮封闭组合的结构形式，使得该机构具有结构紧凑的特点，从而该类机构具有广阔的应用前景。本文针对提出的新型分度机构做了以下研究： 在分度机构创新设计方面，基于颜氏机械装置的创造性设计方法，以前接式凸轮连杆分度机构为原机构，分析了该类分度机构的拓扑结构特点，构造了该类分度机构的一般化链图谱，经过特定化后得到了多种具有相同结构形式的新构型方案，为该类分度机构的创新设计提供了借鉴。 在分度机构尺度综合方面，在系统分析了分度机构结构与传动原理的基础上，建立了分度机构的几何特性及传力特性约束方程；分析了机构的结构参数对几何及传力特性的影响规律；以传力特性最优为目标，提出了该种机构运动学设计的一般方法；建立了新型分度机构的虚拟样机模型，进行了运动仿真，验证了新型分度机构的有效性。 在运动学分析方面，，采用多刚体笛卡尔运动学分析方法，建立了新型分度机构的运动学分析模型，得到了分度机构位移、速度及加速度运动规律，为后续的动力学分析奠定了基础，并且运动学分析的方法可为同类机构的运动学分析提供借鉴。 在动力学分析方面，基于作用线增量法，建立了输出轴转角误差与凸轮和滚子的运动副间隙的对应关系，在此基础上，采用“接触-分离”两状态间隙模型，建立了考虑凸轮与滚子间隙的多刚体动力学模型，得到了一个分度周期内凸轮与滚子间作用力的变化规律，研究了当选取不同凸轮运动规律时，接触力的变化规律，此分析可为凸轮运动规律的选取提供依据。
[Abstract]:In this paper, a new type of cam-connecting rod combined indexing mechanism is proposed to meet the engineering requirements of automatic machinery to realize high speed indexing. The output shaft of the mechanism can be indexed several times during the rotation of the input shaft for one week. The structure form of the input and output coaxial five-bar mechanism combined with the conjugate cam is adopted, which makes the mechanism have the characteristics of compact structure, so this kind of mechanism has a broad application prospect. In this paper, the following research has been done on the new indexing mechanism: in the innovative design of indexing mechanism, based on the creative design method of Yan's mechanical device, the former connecting cam linkage indexing mechanism is the original mechanism. In this paper, the topological characteristics of this kind of indexing mechanism are analyzed, and the generalized chain diagram of this kind of indexing mechanism is constructed. After being specified, a variety of new configuration schemes with the same structural form are obtained. It provides a reference for the innovative design of this kind of indexing mechanism. In the aspect of scale synthesis of indexing mechanism, on the basis of systematically analyzing the structure and transmission principle of indexing mechanism, the constraint equations of geometric characteristic and force transfer characteristic of indexing mechanism are established. The influence of structural parameters on geometry and force transfer characteristics is analyzed, and a general method for kinematic design of the mechanism is proposed. The virtual prototype model of the new indexing mechanism is established and the motion simulation is carried out to verify the effectiveness of the new indexing mechanism. In kinematics analysis, the kinematics analysis model of a new indexing mechanism is established by using the multi-rigid Cartesian kinematics analysis method, and the displacement, velocity and acceleration of the indexing mechanism are obtained. The method of kinematics analysis can be used as a reference for kinematics analysis of similar mechanisms. In the aspect of dynamic analysis, based on the action line increment method, the corresponding relationship between the angular error of the output shaft and the clearance of the cam and roller is established. On the basis of this, the "contact-separation" two-state clearance model is adopted. The dynamic model of multi-rigid body considering the clearance between cam and roller is established, and the law of force variation between cam and roller in a indexing period is obtained, and the law of contact force is studied when different cam motion laws are selected. This analysis can provide the basis for the selection of cam motion law.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH122
[Abstract]:In this paper, a new type of cam-connecting rod combined indexing mechanism is proposed to meet the engineering requirements of automatic machinery to realize high speed indexing. The output shaft of the mechanism can be indexed several times during the rotation of the input shaft for one week. The structure form of the input and output coaxial five-bar mechanism combined with the conjugate cam is adopted, which makes the mechanism have the characteristics of compact structure, so this kind of mechanism has a broad application prospect. In this paper, the following research has been done on the new indexing mechanism: in the innovative design of indexing mechanism, based on the creative design method of Yan's mechanical device, the former connecting cam linkage indexing mechanism is the original mechanism. In this paper, the topological characteristics of this kind of indexing mechanism are analyzed, and the generalized chain diagram of this kind of indexing mechanism is constructed. After being specified, a variety of new configuration schemes with the same structural form are obtained. It provides a reference for the innovative design of this kind of indexing mechanism. In the aspect of scale synthesis of indexing mechanism, on the basis of systematically analyzing the structure and transmission principle of indexing mechanism, the constraint equations of geometric characteristic and force transfer characteristic of indexing mechanism are established. The influence of structural parameters on geometry and force transfer characteristics is analyzed, and a general method for kinematic design of the mechanism is proposed. The virtual prototype model of the new indexing mechanism is established and the motion simulation is carried out to verify the effectiveness of the new indexing mechanism. In kinematics analysis, the kinematics analysis model of a new indexing mechanism is established by using the multi-rigid Cartesian kinematics analysis method, and the displacement, velocity and acceleration of the indexing mechanism are obtained. The method of kinematics analysis can be used as a reference for kinematics analysis of similar mechanisms. In the aspect of dynamic analysis, based on the action line increment method, the corresponding relationship between the angular error of the output shaft and the clearance of the cam and roller is established. On the basis of this, the "contact-separation" two-state clearance model is adopted. The dynamic model of multi-rigid body considering the clearance between cam and roller is established, and the law of force variation between cam and roller in a indexing period is obtained, and the law of contact force is studied when different cam motion laws are selected. This analysis can provide the basis for the selection of cam motion law.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH122
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