Design and optimization of weeding mechanism with complex motion trajectory gear train
LIU Jiaodi
YAO Zhijie
ZHONG Chunyan
CHEN Qingli
ZHANG Xiaolong
QUAN Longzhe
Abstract：[Objective]To address the current challenges in achieving effective inter-plant weeding trajectories with peanut weeding mechanisms,which often result in root injury or unavoidable weeding blind zones,a method that combined the weeding rod with a second-order complex gear train structure was proposed.The unequal-speed transmission characteristics of the end linkage,caused by large-scale transmission ratio changes of the second-order elliptical gear,were utilized to achieve a periodic inter-plant weeding motion.[Methods]Firstly,The second-order non-circular gear pendulum weeding mechanism was simplified to an open-chain 2R mechanism,and its forward kinematic model was established.Secondly,the graphical user interface(GUI)in Matlab software was used to develop auxiliary analysis and optimization software for the simplified open-chain 2R weeding mechanism to explore the effects of key structural and kinematic parameters on the weeding trajectory.Thirdly,response surface methodology was applied to analyze the interaction of multiple factors on the trajectory.The boundary conditions of the mechanism parameters were determined based on agronomic requirements.Finally,the parameters of the gear train pendulum mechanism were optimized using a genetic algorithm to meet the agronomic weeding requirements.[Results]Adams software simulation results show that the complex trajectory aligns with that of the theoretical model,verifying the feasibility of the gear train pendulum mechanism design.
Keywords：Peanut weedingSecond-order non-circular planetary gear trainGear train pendulum mechanism
Publication Date：2026-04-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：11( 56-66 )