Research On The Mechanism And Equipment Of Greenhouse Cucumber Application Based On Ultrasonic Pneumatic Atomization Technology

With the tremendous development of the facility agriculture in China recently,supporting facilities and equipment can not meet the needs of agricultural production The traditional methods of pesticide application in facility agriculture are mainly manual spraying,maneuverable backpack spraying and suspension spraying,which are inefficient,poor adaptability and expensive,and it is easy to cause poisoning incidents in the process of application.At present,the commonly used methods of pesticide application in facility agriculture are generally large-scale application with the same standard.without targeting crop characteristics,contrary to agronomic requirements,resulting in a large amount of pesticide waste and environmental pollution.Targeted application is a safe,efficient and agronomic application method,which maximizes the utilization of application equipment and pesticides,reduces resource waste and environmental pollution,and improves production efficiency.In this project,the application mechanism and equipment of greenhouse cucumber are studied based on ultrasonic aerosol atomization technology.Through the analysis of greenhouse cucumber plant characteristics and characteristics of diseases and insect pests,combined with ultrasonic atomization technology,the control strategies for diseases and insect pests of greenhouse cucumber are proposed to improve the control efficiency.This project comes from Yangzhou City School Cooperation Project in 2016.According to the spatial and temporal variation of Whitefly in greenhouse cucumber,this paper mainly analyzes the spatial distribution parameters and time series changes of Whitefly in Cucumber greenhouse.The reason of whitefly aggregation is analyzed by regression equation.The theoretical sampling number is determined and the sequential sampling model is established.From the biological point of view,it provides a theoretical basis for the pest control strategy of cucumber Whitefly in greenhouse to ensure that the outbreak trend can be curbed before the outbreak of whitefly,and the loss can be prevented in time during the outbreak of whitefly.In this paper,the principle of ultrasonic atomization is discussed,and the relationship between surface wave theory and micro-shock wave theory is obtained.At the same time,the atomization angle,droplet size and initial velocity of ultrasonic pneumatic atomization are obtained.The movement of droplets after ultrasonic pneumatic atomization is simulated by MATLAB.The movement law of droplets under different droplet size and initial velocity is analyzed,and the droplet velocity variation curve and two-dimensional sitting are obtained.The trajectory curve provided the basic theoretical parameters for the design of the prevention and control robot.In this paper,based on the theory of droplet movement after ultrasonic aerosol atomization,a crawler-type walking chassis which can walk in a Cucumber Greenhouse with a row spacing of 60-70cm is designed to realize stepless speed change of 0-1.25m/s and remote control function.Two 1.8m high aluminium alloy spray rods are designed with 12-18 sprinklers.In order to meet the needs of ultra-low dosage application of ultrasonic aerodynamic atomization and the actual situation of greenhouse cucumber pests and diseases,other atomization devices such as ultrasonic nozzles,ultrasonic generators,air pumps and water pumps are selected.After the preparation of the prevention and control robot,the basic experiments on droplet spray angle,droplet size and uniformity are carried outIn this paper,the field experiment is carried out on the basis of the practical application performance of the self-propelled prevention and control robot in the greenhouse.The spray angle and the spraying distance are taked as variables,the aerosol droplet coverage rate of the upper and lower leaves of cucumber plants is taken as the main parameters,and the atomization performance is tested and analyzed.The results show the upper and middle parts need upward application angle,while the lower and middle parts need downward application angle,and the effect of application distance is very small.On this basis,the sprinkler angle is rearranged,and the biological characteristics of whitefly obtained in the previous paper are tested from the 7th day of the outbreak of whitefly.Comparing with manual spraying and sprinkler angle unchanged spraying method,more reasonable sprinkler layout of the machine has achieved the best control effect.