Simulation Analysis and Optimization Design of the Cutting Mechanism for a Small Leafy Vegetable Harvester
To meet the design requirements of high efficiency,energy saving,and low cost for small leafy vegetable harvesters,this research is based on the agronomic needs of cultivation and uses SolidWorks for the whole machine's three-dimensional modeling.To ensure the cutting mechanism meets the requirements of small harvesters,this paper utilizes RecurDyn multibody dynamics software,EDEM discrete element simulation software,and ANSYS Workbench finite element simulation software for joint simulation and data coupling to conduct the simulation analysis.The simulation results show that the cutting mechanism of the small leafy vegetable harvester employs linear bearings to fixedly support the shovel components,which are driven by a crank connecting rod mechanism.This mechanism's movement trajectory can effectively cut the leafy vegetables and ensure the stubble is neat.During the cutting process,when the harvester's forward speed is V=1 m/s,the optimal driving speed of the cutting mechanism's drive motor is R=5 r/s,at which point the shovel mechanism's relative ground speed is greater than 0m/s.The main external load the shovel mechanism bears during the working process is the working resistance of the soil against the shovel,with the maximum resistance at the shovel mechanism's fastest relative ground speed being 15.4438 N.With the external load and constraints on the shovel mechanism determined,a finite element static analysis is conducted on the shovel.The analysis reveals that the maximum stress(σmax)the shovel endures during operation is 14.5MPa,with stress concentration occurring at the rear position of the shovel and shovel bracket.The maximum strain is 3.3481e-10mm,occurring on the flanks of the shovel.This research can provide a reference for the struc-tural optimization of the shovel-type cutting mechanism of small leafy vegetable harvesters.
万方数据
维普
