Development And Experimental Study Of Solar Greenhouse Inter-row Spray Machine

In the growing process of vegetables in solar greenhouse,pesticide spraying should be carried out for many times in order to effectively control diseases and insect pests.The degree of automation of existing domestic greenhouse spraying equipment is generally low and the spraying efficiency is low too.Due to the relatively occlusive greenhouse environment,it is difficult to achieve the separation of human and medicine due to the long contact time between fog drops and operators after spraying,which will cause harm to human health.Due to the intensive planting of greenhouse vegetables and the high randomness of artificial spraying,the coverage uniformity and effective deposition of pesticides are low,and the actual utilization rate of pesticides is usually lower than 30%,which not only causes resource waste but also pollutes the environment.In order to improve the automation level of greenhouse plant protection machinery,increase the effective deposition amount of pesticide spraying,enhance the penetration of droplets in the height direction of plants,and reduce the manpower used in the greenhouse plant protection process,a solar greenhouse inter-row sprayer was designed.The sprayer consists of a two-track suspension positioning system and a spray host.The inter-row sprayer in the solar greenhouse provides two spray modes,a boom lift and a boom fixed,which respectively implement an inter-row spray and a common spray.The main research contents of this paper include:the overall design plan of"double track suspension positioning system+spray main engine"is put forward;the subsystems of the solar greenhouse inter-row spray machine are designed,and the key components parameters of each system are determined,including the design of the double track suspension positioning system,the design of the self-propelled system,the boom design,the spray system design and the control system design.The main parameters of self-propelled motor and lifting motor and the matching frequency converter are determined,the parameters of sprinkler head and the reasonable installation space of sprinkler are determined,the demand of spray system for spray pressure and flow is analyzed,the parameters and types of booster pump are determined,the type of the relevant sensor is determined according to the automatic detection requirements of each system,and the 3D model of the whole machine is established by using SolidWorks.Based on the ADAMS virtual prototyping technology,the dynamic simulation analysis of the inter row spray process of the boom lifting system is carried out.The design scheme of the boom in the boom lifting system is determined.Based on the functional requirements of the whole system,the human-machine interaction interface is designed by using MCGS software,and the manual settings of spray mode and spray parameters are realized.The prototype was processed and tested,and the tomato in the middle and late growth period was used as the test object.The effects of two spray modes on droplet deposition,deposition uniformity and droplet penetration were studied.The results showed that when the spray boom lifting mode was used,the average droplet deposition per unit area on both sides of tomato leaves was 1.77?L?cm^-2 and 0.817?L?cm^-2,and the average variation coefficient of droplet deposition was 7.3%and 19.53%,respectively.When the spray boom fixed mode was used,the average droplet deposition per unit area on both sides of tomato leaves was 1.12?L?cm^-2and 0.086?L?cm^-2,and the average coefficient of variation of droplet deposition was 33.2%and 74.7%,respectively.The boom lifting mode greatly increases the amounts of droplets deposited on the reverse side of the middle and lower leaves of the plant,and makes the droplet deposition on both sides of the leaves of the plant more uniform.