Elliptical-circular Planetary Gear Train Box-taking Mechanism Design and Trajectory Analysis for Automatic Cartoning Machines

doi:10.3901/JME.2018.11.172

Abstract

Abstract: A planetary gear train box-taking mechanism continuously rotates in automatic cartoning machines and shows a better performance than the pendulum box-taking mechanism due to its smaller trajectory and higher speed. Based on the movement requirements of hypocycloid trajectory and variable transmission ratio character of a non-circular gear train, a new type of box-taking mechanism of planetary gears using elliptical-circular gear is developed instead of circular planetary gears. The extremity movement trajectory of the box taking is also optimised. Thereafter, the kinematic models of circular and elliptical-circular planetary gears are established, and the work principle and movement characteristics of the two mechanisms are analysed. Moreover, the simulated trajectory and movement characteristics of the mechanisms are solved, and the influence of the main parameters on movement trajectory and characteristics are analysed. Using the man-machine interactive optimisation method, the parameters of the elliptical-circular planetary gear train box-taking machine are optimised, and a group of superior structural parameters is identified. In addition, a three-dimensional simulation model is developed using the main structural parameters. Finally, the movement characteristics of the elliptical-circular gear are compared with those of the circular planetary gear. The change in velocity reduced by 14.3% at the box-taking and box-putting stations, while the maximum acceleration decreased by 9.9%. This study can provide a theoretical basis for the design of planetary gear train box-taking mechanism.

Key words: automatic cartoning machine, box-taking mechanism, man-machine interaction, non-circular gear, planetary gear train

CLC Number:

TH13

TONG Junhua, TANG Ququ, WU Chuanyu, LOU Haifeng, CHENG Peilin, LI Xiang. Elliptical-circular Planetary Gear Train Box-taking Mechanism Design and Trajectory Analysis for Automatic Cartoning Machines[J]. Journal of Mechanical Engineering, 2018, 54(11): 172-179.

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