目的 研发设计塑料瓶吹灌封一体机最关键的合模机构，通过有限元数值仿真方法，分析验证合模机构设计的合理性，为持续进行高强度的合模作业提供保障。方法 通过对合模机构进行结构设计，使其具备吹、灌、封一体化功能;采用有限元数值仿真方法，对设计的合模机构组件的力学强度及运行过程的位移进行分析。结果 合模机构的支撑轴接触部位应力过大，通过将材料2Cr13变更为3Cr13，可提高支撑轴的强度;同时优化合模支撑轴的结构改善接触部位的应力分布。有限元数值仿真结果显示，支撑轴接触部位最大等效应力为394.13 MPa，比原模型最大等效应力下降36.95%，满足结构强度要求。结论 合模机构中部合模支撑轴与中间定位板横向接触位置应力集中，是结构设计的薄弱环节;采用有限元数值仿真方法可快速准确地分析合模机构的结构强度，并通过迭代优化设计，确保合模机构作业的可靠性与稳定性;设计的合模机构精度高、运行稳定，满足设计要求。

The work aims to develop and design a clamp mechanism, the key part in blowing, filling and sealing integrated machine for plastic bottles and analyze and verify the design rationality of the clamping mechanism, so as to provide support for high-intensity clamping operation. The clamping mechanism was designed to meet the integrated functions of blowing, filling and sealing. The finite element numerical simulation method was used to analyze the mechanical strength and displacement of the designed clamping mechanism components during operation. The stress at the contact part of the support shaft of the clamping structure was large, and the strength of the support shaft was improved by changing the material 2Cr13 to 3Cr13. At the same time, the structure of the clamping support shaft was optimized to improve the stress distribution at the contact part. The finite element numerical simulation results showed that the maximum equivalent stress at the contact part of the support shaft was 394.13 MPa, which was 36.95% lower than that of the original model, and met the structural strength requirements. The stress concentration at the transverse contact part between the clamping support shaft and the middle positioning plate in the middle of the clamping mechanism is the weak link in structural design. The finite element numerical simulation method can quickly and accurately analyze the structural strength of the clamping mechanism, and improve the design through iterative optimization to ensure the reliability and stability of the clamping mechanism. The designed clamping mechanism has high precision and stable operation, which meets the design requirements.