Optimization Design And Experimental Study On Transplating Mechanism Of Sweet Potato Seed Seedlings

China is a large grain producer country,the main crops include rice,sorghum,peanut and sweet potato.The output of sweet potato crops accounts for about 80% of the world’s total output,and the total planting area reaches 60% of the world.In the process of sweet potato production,transplanting mechanization can improve work efficiency,reduce costs,and increase farmers’ income.Therefore,research and design of sweet potato seedling transplanting mechanism have important scientific significance and design application value for promoting the sustainable development of my country’s sweet potato industry and improving the level of agricultural mechanization.In this paper,based on the problems of the low transplanting efficiency,complex structure,missing seedlings,and low success rate of existing sweet potato transplanting mechanisms in the domestic and foreign markets,this paper has compiled an auxiliary analysis and optimal design program,through which the analysis and optimization of mechanism parameters are realized.According to the structural parameters obtained after parameter optimization,structural design and three-dimensional modeling are carried out,and the three-dimensional model is used for simulation test while exporting two-dimensional diagrams for processing and assembly and physical prototype bench test.The main research contents and results of this article are as follows:1)According to the agronomic requirements and design requirements of transplanting naked sweet potato seedlings on membranes,a rear-insertion rotary transplanting mechanism with an elliptical gear planetary gear train is proposed for kinematic modeling.2)The program for auxiliary analysis and optimization of the transplanting mechanism’s structural parameters was written using VB6.0 software.Through this program,the structural parameters of the transplanting and transplanting mechanism were analyzed and the movement trajectory of the claw tip of the seedling was optimized.A set of structural parameters that the transplanting mechanism meets the agronomic requirements of sweet potato transplanting.3)Carry out the structural design of the transplanting mechanism components according to the obtained structural parameters,and then establish a three-dimensional model and assemble.Import the three-dimensional model into ADAMS to modify the material properties,add constraints and driving forces for simulation,and obtain the simulation trajectory of the gripping claw point.The trajectory is compared with the trajectory obtained in the optimization program.The results are basically the same,which proves the correctness of the kinematics model.4)In order to verify whether the actual transplanting effect of the transplanting mechanism meets the agronomic requirements,the three-dimensional model is derived from the two-dimensional drawing for processing and assembly.At the same time,a test bench is set up for the transplanting mechanism idling test and the sweet potato naked seedling transplanting test,and the idling test recorded with a camera and imported into Photoshop software to draw the trajectory of the gripping claw point,the real trajectory obtained is basically consistent with the theoretical trajectory and the simulated trajectory.The results of the transplanting test of naked sweet potato seedlings show that the mechanism can basically achieve the agronomic requirements for transplanting naked sweet potato seedlings when the motor speed is 45 r/min.