Design And Experimental Research Of Greenhouse High-Pressure Atomization System

In the context of increasing the level of agricultural mechanization and intelligence,it has become an inevitable trend to develop special plant protection equipment suitable for the spatial structure characteristics of greenhouses and crop growing patterns in China.At present,domestic greenhouse plant protection is still based on the traditional way of administering medicine,low operating efficiency,high labor intensity,low utilization of pesticides,and enclosed spraying environment is prone to problems such as soil contamination and operator poisoning.In this paper through field research and reference literature,a system of greenhouse high-pressure atomization was developed.Through theoretical research and experimental analysis,the system construction,control system design,and greenhouse atomization effect test was completed.The main research content of this thesis included the following points:(1)According to the operating environment and functional requirements of the greenhouse,the overall scheme design of the system was completed,and the fixed ceiling-type high-pressure fogging application and cooling scheme was determined.Design and machining of physical prototypes through theoretical analysis and SolidWorks modeling.The characteristics of the spray nozzle atomization field are simulated and analyzed by the CFD technique.The spray morphology of different aperture nozzles under different pressure is investigated.The main components of the system are calculated and selected theoretically,and the system is constructed as a whole.(2)Siemens S7-200 SMART PLC as the control core and WECON touch screen as the operation core.Develop the control scheme according to the functions to be realized by the system,and complete the system control program design by programming software and configuration software.The system can carry out automatic spraying or cooling operation of the greenhouse and realize the separation of humans and medicine.Control system operation through the touch screen and monitor system running parameters in real-time,enabling friendly human-computer interaction.(3)An experimental study was conducted on the operating parameters of the greenhouse high-pressure atomization system.Taking atomized fog droplet distribution uniformity as evaluation index,atomizing pressure,atomizing nozzle aperture,atomizing time as test factors,carrying out single factor test.The results show that the atomization pressure and nozzle aperture have a significant effect on the system atomization effect.The orthogonal regression test was designed based on a single-factor test.The optimal operating parameters of the system were determined by analyzing the experimental data.System in high-pressure atomization pressure 4MPa,atomization nozzle aperture 0.4mm parameters under the operation of better results.Field tests have shown that the system operates under these parameters to meet the requirements of greenhouse atomization spraying and atomization cooling functions.