硬质夹层三明治结构预制体缝合装置换针机构分析

Analysis of needle changing mechanism of prefabrication stitching device of hard sandwich structure

带预刺功能硬质夹层三明治结构预制体缝合装置以碳纤维为缝合线,选用优化Tufting缝合工艺进行缝合。在缝合过程中,换针机构以气缸为动力源进行摆动,实现缝合针与预刺针的切换。为使换针摆动过程稳定,将换针机构简化为摆动导杆机构,选用拉格朗日法对其进行动力学建模。通过MATLAB对动力学方程进行求解,得到换针机构各构件随时间变化的运动曲线。运用机械系统动力学仿真分析软件(ADAMS)建立缝合装置虚拟样机模型进行仿真,将仿真分析结果与理论分析结果进行比较,证明了换针机构动力学分析的准确性。实体样机实验验证了优化Tufting缝合工艺的有效性,换针机构满足工作要求,为后续硬质夹层三明治结构预制体缝合装置机构完善以及控制系统设计奠定基础。

The carbon fiber is used as the suture line in the suture device of sandwich structure with pre-punch function,and the optimized Tufting suture process is selected for suture.During the suture process,the needle change mechanism swings with the cylinder as the power source to realize the switch between the suture needle and the pre-punch needle.In order to make the swing process of the needle change stable,the needle change mecha⁃nism is simplified as a swing guide rod mechanism,and chose the method of Lagrange dynamics modeling.MTALAB was used to solve the dynamic equation,and the motion curves of each part of the needle exchange mechanism with time variation were obtained.Use of mechanical system dynamics simulation analysis software(ADAMS)built the virtual prototype model of suture device simulation.The theoretical analysis results were compared with the simula⁃tion results,then the accuracy of dynamic analysis of needle changing mechanism was proved.The experiment of solid prototype verified the effectiveness of the optimized Tufting suture process,and the needle changing mechanism met the working requirements,it establishes a theoretical basis for the improvement of the suture device and control system design of the prefabricated body suture device of sandwich structure with hard interlayer.