Design And Experiment Of Planting Mechanism For Tomato Automatically Transplanting

At present,the mechanization degree of tomato transplanting is not high,the efficiency of planting is low,the quality of transplanting can not be guaranteed.The main methods of transplanting tomato are mainly artificial and the cost of labor is high,which is not conducive to the development of tomato planting.In order to meet the requirements of high speed automatic transplanting and improve the quality of transplanting and production efficiency,a planting mechanism of tomato automatic transplanting machine was designed in this paper,and a field experiment was carried out.The main contents are as follows:（1）The overall structure design of tomato automatic transplanter was carried out.First of all,it analyzes the common standard seedling plate seedling plate,determines the size of the seedling plate used in the cultivation of tomato seedlings,and provides the data base for the whole design.Then,based on the structure of the automatic tomato transplanter at the present stage,through the innovation of the function and the optimization of details,the overall design scheme of the tomato automatic transplanting machine is established.According to its functional requirements,the basic structure of each transplanting machine and the working principle of each functional component are determined.（2）The structural design and parameter design of the five bar planting mechanism.First,the structure function and advantages and disadvantages of the existing t ransplanter planting mechanism are analyzed,and the duckbill multi pole planting mechanism is determined as the initial model of this paper.Then the structure design and the parameter design of the five connecting rod mechanism,the duck beak planter and the cam press rod are designed.Finally,according to the"zero speed vaccine",the original model is designed.According to the SolidWorks software,the virtual prototype model is established,and the simulated motion curve is obtained through Motion.The optimization of the planting track and performance parameters is realized,and the structural parameters of the five bar planting mechanism are finally determined.（3）The finite element analysis and kinematics simulation of key parts of planting mechanism were carried out.On the basis of ADAMS,the kinematic simulation analysis of the virtual prototype of five bar planting mechanism is carried out.When the spindle speed is60r/min and the translation speed is 0.3m/s,the motion parameters curve and track line of the planting point are obtained.Through the analysis of the velocity displacement curve,it is concluded that when the planting point runs to the lowest position,the horizontal direction velocity is 0.The structure and size parameters of the five bar mechanism meet the design requirements.Based on ANSYS,the static finite element analysis of the hole punter on the duckbill planter is carried out.The effective pressure of the acupoint is estimated according to the soil condition.The maximum stress of the acupoint is calculated after the addition of constraints and loads is 6.02MPa,the maximum strain is 3.59×10^-5 at the upper bend of the acupoint at the top of the acupoint,and the data is calculated by the analysis results.Checking and checking the mechanical properties of the hole opener finally verifies the rationality of its structural design.（4）Complete the prototype machining,installation and commissioning,and carry out prototype field test to verify the feasibility of the design of the planting mechanism.The field test data show that when the speed of the transplanter is 0.95km/h and the planting frequency is 120/min,the fine degree is up to 96.1%,which can meet the agronomic requirements of tomato transplanting.