Research And Design Of Key Components Of Orchard Spraye

Orchard production and planting will reduce production every year due to pests and diseases,which has always troubled fruit farmers.Orchard plant protection is an important part of planting production,which can effectively eliminate diseases,insects,weeds and other harmful organisms,and is an important link in agricultural and forestry production.Orchards have different requirements for sprayers due to different planting patterns and environments.At present,there are mainly small manual sprayers and mechanical traction sprayers on the market.Traction sprayers are huge and difficult to work in orchards with limited space.Large-flow covering spraying method is adopted,and the amount of pesticides is large,which affects the control effect and is not suitable for low and loose orchards.Small sprayer is simple in structure,easy to operate and difficult to adjust its height,which leads to incomplete spraying.Aiming at the shortcomings of manual and mechanical spraying in orchard,a small orchard sprayer assisted by airflow was designed.Solve the problems of spray height,distance and spray amplitude,and improve the spray range and control effect.On the basis of orchard investigation,the overall design scheme of sprayer is determined.Aiming at the problems existing in the garden spraying,the chassis structure and spraying device of the sprayer are designed,and the whole machine is modeled by Solidworks software,and the parameters of the main components are determined,and the components such as motor,diaphragm pump,medicine box and sneezer are selected.The finite element static analysis of the frame model is carried out by Ansys software,and the displacement and stress of the frame under bending and torsion conditions are simulated by analyzing the bearing capacity of the chassis of the spraying machine under two conditions.The free mode analysis of the chassis frame is also carried out to avoid resonance caused by overlapping excitation frequencies.For the strength analysis of spray support,the design of key components meets the strength requirements.Flunet simulation is used to simulate the internal and external spray fields.It is verified that the parameter design of spray tube and fan blade meets the requirements.Through the simulation and comparative analysis of droplet dispersion under different pressures and wind speeds,it is found that the effect of droplet dispersion is good and there is no wind when the airflow is assisted,and the coverage and diffusion of spray area are the best spray settings when the airflow auxiliary speed is 10m/s and the spray pressure is 1MPa.Finally,after the parts were processed and assembled,the performance of the prototype was spray tested in cherry orchard in greenhouse.The penetration and attachment of droplets under different spray pressures,different wind speeds and distances are analyzed,and the feasibility of fluid simulation is verified.The experimental results show that the airflow-assisted liquid medicine is atomized and distributed on the leaf surface and the back of the leaf,and the penetration ability and utilization rate of droplets are improved,and the prototype achieves the spraying operation effect.