多间隙铰链印刷机递纸机构动力学特性研究

Research on the Dynamic Characteristics of the Gripper Mechanism with Multi Clearance Joints for Printing Machines

递纸机构的动力学特性对印刷机的印刷速度、套准精度以及印品质量具有重要影响。递纸机构大多由凸轮机构和连杆机构串联而成,不可避免地存在铰链间隙;铰链间隙的存在将降低机构稳定性、工作效率,缩短寿命。以凸轮连杆机构为研究对象,建立含多间隙铰链的机构动力学模型,分析了不同间隙尺寸、间隙铰链位置、间隙铰链数量对机构动态响应的影响。结果表明,上述因素均对递纸机构的传动精度和稳定性产生影响,其中,多间隙铰链之间的相互作用对机构动力学特性的影响显著。为含间隙铰链印刷机的结构优化设计提供了参考。

The printing speed,registration accuracy and print quality of the printing machine are deeply affected by the dynamic characteristics of the gripper mechanism.The gripper mechanism is mostly composed of a cam mechanism and some connecting rods,where joint clearances inevitably exist.The stability,work efficiency and lifespan of the mechanism would be reduced by the joint clearances.Taking a cam-linkage mechanism as the research object,a dynamic model of the mechanism with multiple clearance joints was established.The effects of different clearance sizes,clearance joint positions,and the number of the clearance joints on the dynamic responses of the mechanism were analyzed.The results indicate that all the above factors have an impact on the transmission accuracy and stability of the gripper mechanism,and the interaction between multi clearance joints has a significant impact on the dynamic characteristics of the mechanism.This study provides reference for the structural optimization design of printing machines with clearance joints.