| As a mechanical equipment for transplanting crops,transplanting machines are widely used in my country’s agricultural production.However,in terms of flue-cured tobacco production,some scientific and technological workers innovated and proposed a new type of flue-cured tobacco planting agronomy(namely,well cellar transplanting agronomy),which was quickly promoted and applied nationwide.However,when adopting new agronomic practices to grow flue-cured tobacco,traditional transplanting machines(such as duckbill,hanging basket,and ditch transplanting machines,etc.)cannot produce wells that conform to the new agronomics,and thus cannot be realized.Tobacco seedlings are planted with deep roots;in addition,traditional transplanters mostly use wheeled walking chassis,which not only has the problem of large structural size and weight,but also has poor maneuverability and steering performance,making it difficult to adapt to the complex mountain and hilly terrain environment.Southwestern provinces.Therefore,designing a self-propelled seedling transplanter that can adapt to well cellar transplanting agronomy and complex mountain and hilly terrain is of great significance for promoting the mechanization of flue-cured tobacco planting in Southwest my country.This paper comprehensively uses software platforms such as Solid Works,Hyper Mesh/Opti Struct,Hyper Study,Recur Dyn,FEMFAT and MATLAB to carry out detailed design and research on the self-propelled seedling transplanter.The main research contents are summarized as follows:(1)The planting environment of flue-cured tobacco,the characteristics of tobacco seedlings and the agronomic parameters of cellar transplanting in southwestern China were investigated,and the basic data required for designing seedling transplanters were obtained,and the self-propelled seedling transplanters were calculated in detail based on the basic data.The parameters of the key components of the walking chassis and the transplanting platform.(2)Lightweight research was carried out on the frame of seedling transplanter.The finite element model of the frame is established with finite element software,and its dynamic and static characteristics are analyzed.On this basis,combined with multidisciplinary optimization software,the lightweight research of the frame is carried out.(3)The driving ability of seedling transplanter was studied.The multi-rigid body dynamics simulation model of the seedling transplanter was established by the multi-body dynamics software,combined with the theoretical derivation results,to verify the accuracy of the simulation model.Based on this model,the ability of the seedling transplanter to drive straight,maneuver and cross obstacles was studied..(4)The driving comfort of the seedling transplanter was studied.Use the finite element software to make the frame flexible,and import it into the multi-body dynamics software to establish the rigid-flexible coupling dynamics simulation model of the seedling transplanter,and then import the three-dimensional road data into the model to establish the road-machine-human vibration System simulation model,based on which the ride comfort of seedling transplanter is studied.(5)The fatigue strength of the seedling transplanter frame was studied.Based on the simulation results of the road-machine-human vibration system,the dynamic stress time history of the frame is extracted,and the random vibration fatigue of the frame is studied from the perspective of time domain analysis. |
