| The deep application of liquid fertilizer is a technique to apply the liquid fertilizer to the soil layer near the root of the crop by deep-fertilizer applicator of the liquid fertilizer.It can effectively improve the absorption of the fertilizer,improve the grain yield and quality,and reduce the environmental pollution caused by the volatilization of the fertilizer,which is in line with the national strategic goal of the agriculture sustainable ecological.The oblique type pricking hole mechanism is the key component of applicator,used to pricking hole in soil and apply liquid fertilizer deeply.At the same time,it is necessary to ensure the smaller hole and mechanical damage of the crop.However,there will be vibration in the operation process because of the interaction between machine and soil,it will make the trajectory of needle tip fluctuate and affect the quality of fertilization.In view of the above problems,this paper focuses on the dynamics study of the oblique type pricking hole mechanism is the key component of applicator,used to pricking hole in soil and apply liquid fertilizer based on ANSYS/LS-DYNA,establishes an accurate and reliable finite element numerical simulation model,explores the coupling mechanism between mechanism and soil,optimizes its structural parameters and working parameters,and provides reliable technical support for the deep application of liquid fertilizer efficiently and high quality.In this paper,the coupling mechanism between the soil and the spray fertilizer needle is studied.The dynamic model is set up,and the virtual simulation of coupling between the needle and the soil is studied by ANSYS/LS-DYNA software,and the soil disturbance,stress change and the formation of the acupoint during the process in the working condition are analyzed.On this basis,the dynamic test bench of the oblique type pricking hole mechanism is set up independently,the dynamic optimization test is carried out,analyze the influence of various factors on the mechanical and the working quality,and the optimal working parameters combination is obtained,so as to provide a new method and new idea for the optimization of the inclined ligation mechanism.The main contents are as follows:(1)The dynamic analysis of the oblique type pricking hole mechanism is carried out.Taking the mechanism as the research carrier,the operation principle and the agronomic requirements are expounded,and the dynamic analysis of the components is carried out.The dynamic equilibrium equations of the solar gear axis,the sun gear,the middle gear,the planetary gear and the spray fertilizer needle are established respectively,and the relationship of the interaction between the mechanism and the soil is analyzed and the influence of working quantity and efficiency quality of the mechanism is also analyzed.(2)The dynamic simulation and analysis of coupling effect between soil and the needle are studied based on ANSYS/LS-DYNA,and the feasibility of using it to study the coupling between soil and needle is discussed.Combined with the soil characteristics of the deep application of liquid fertilizer in Northeast China,the typical soil constitutive model and the material parameters of key components are studied to determine the accurate simulation parameters.On this basis,the kinematic analysis software ADAMS is used to obtain the trajectory and attitude of the needle tip of the injection needle in the process of ligation,so as to obtain the theoretical basis for the subsequent coupling mechanism analysis with the change of the actual displacement with time(3)The coupling mechanism analysis between the spray fertilizer needle and soil is carry out.the finite element model of the spray fertilizer needle and the soil are established by using the Pro/E,the reasonable boundary conditions and load are set,and then,the virtual simulation test research is carry out.In the process of observation,the relationship between the needle and the soil was related,and the soil disturbance,the change of soil stress,the formation process and the change of the acupoint with the needle body movement were analyzed.Simulation experiments under different working parameters were carried out to analyze the effect of soil on the action of the needle under different working conditions.The results show that the soil disturbance decreases first and then increases with the increase of the planetary frame speed and the working speed,and the soil disturbance gradually decreases with the increase of the oblique angle.(4)The dynamic optimization test of oblique type pricking hole mechanism is studied,and the dynamic test bench is set up independently.The force of the spray fertilizer needle is defined as the tensile force and the bending force.The test factors are the forward speed,the planetary frame speed and the oblique angle,and the test indexes are the tensile and bending force of the spray fertilizer needle.The multi-factor dynamic test was carried out to compare the dynamic stress curve in the test and the virtual simulation.The main reasons for the mechanical change under various working conditions were analyzed,and the better work of the mechanism and the combination of structural parameters were obtained.The test results show that under the working speed is 0.52m/s and the rotation speed is 70r/min and the oblique angle is 28 °,the working quality of the mechanism is the best,the tensile force of the needle is 22.06 N,and the bending force is 56.87 N. |
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