Optimization Design of Clamping Mechanism for Plastic Bottles Based on Finite Element Method

ZHOU Lijun; DING Xiaofeng; JIANG Fubo; WANG Dong; LI Zhiwei; HUANG Lijun; SUN Xudong; GAN Liang; CHEN Shaojian; XU Bin; WANG Changpeng

doi:10.19554/j.cnki.1001-3563.2025.21.025

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (21) : 231-238. DOI: 10.19554/j.cnki.1001-3563.2025.21.025

Automatic and Intelligent Technology

Optimization Design of Clamping Mechanism for Plastic Bottles Based on Finite Element Method

ZHOU Lijun¹, DING Xiaofeng^1*, JIANG Fubo¹, WANG Dong¹, LI Zhiwei¹, HUANG Lijun¹, SUN Xudong¹, GAN Liang¹, CHEN Shaojian¹, XU Bin², WANG Changpeng²

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Abstract

The work aims to simulate and calculate the designed clamping structure through finite element simulation modeling and numerical analysis, to find the weak position of the structural design, analyze the stability of the force of the clamping mechanism, and provide stability and strength guarantee for the continuous high-strength plastic bottle clamping forming process of the equipment. Through the structural design of the clamping mechanism of the equipment, the station was enabled to meet the integrated functions of forming, filling and sealing of plastic bottles. Based on the finite element modeling and simulation method, the actual driving force loading curve was used to simulate and analyze the designed clamping mechanism for structural optimization design and verify the rationality of structural design. The stress at the contact part of the main mold driving connecting rod and the mutation part of the main mold boom structure of the clamping mechanism was too large. After the structural optimization design, the clamping force of the main mold was reduced to 55 078 N, which was reduced by 0.9 %, and the clamping force of the auxiliary mold was reduced to 26 769 N, which was reduced by 6.8%. The maximum equivalent stress was reduced from 523.3 MPa to 323.9 MPa after the structural improvement of the structural mutation site of the main mold boom, with a decrease of 11.71%. The stress distribution of these two parts was improved by structural optimization. The stress concentration at the contact part of the main mode drive connecting rod and the sudden change part of the main mode boom structure of the clamping mechanism is the weakest point in the structural design of the whole clamping mechanism. With the help of finite element numerical simulation method, the simulation calculation and analysis of the clamping mechanism can be effectively and accurately carried out, and then the structure can be optimized and improved to ensure the strength and stability of the clamping mechanism in the plastic bottle forming process.

Key words

finite element / clamping mechanism / static strength / optimization iteration

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ZHOU Lijun, DING Xiaofeng, JIANG Fubo, WANG Dong, LI Zhiwei, HUANG Lijun, SUN Xudong, GAN Liang, CHEN Shaojian, XU Bin, WANG Changpeng. Optimization Design of Clamping Mechanism for Plastic Bottles Based on Finite Element Method[J]. Packaging Engineering. 2025, 46(21): 231-238 https://doi.org/10.19554/j.cnki.1001-3563.2025.21.025

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