Design And Experimental Study On Small Electric Self-propelled Striping Boom Sprayer

Corn and soybean strip compound planting technology is one of the important measures for national implementation of soybean revitalization.So far,it has become an important technical means to increase soybean planting area and output and ensure national food security.However,the whole-course mechanization is the bottleneck of popularization and application of this planting model,and mechanized plant protection is the weakest link.At this stage,most of the crop field plant protection machinery is only suitable for a single crop,and cannot meet the agronomic needs of different regions of the soybean and corn strip compound planting model.Therefore,based on the mechanized plant protection needs of the soybean and corn strip compound planting mode,this study designed and developed a small electric self-propelled split boom sprayer to solve the mechanized field management problems of this mode and provided equipment support for the promotion of this mode.The main research contents are as follows:1)Determined the performance indicators and overall design plan of this equipment against the agronomic requirements of soybean and corn strip planting and the actual operating environment.According to the 2:2-4 strip planting mode of soybean and corn,this equipment adopts four-wheel electric drive,adjustable wheelbase of 1～1.3m,Ackerman steering.And the drive motor model and power supply parameters are calculated and selected.2)Completed the chassis structure design of the sprayer,and analyzed finite element.And the stress and displacement distribution diagrams of the chassis under both bending and torsion conditions were drawn.The maximum stress of the sprayer chassis is 87.18Mpa,and the maximum displacement is 0.44mm,which are both less than the yield limit of the material.The modal analysis of the chassis was carried out,and the natural frequency(5.46～62.59 Hz)and mode shape of the first six orders were obtained.At the same time,the maximum external excitation frequency was calculated to be 9.38 Hz.The analysis results showed that the chassis structure design meets the working requirements.3)A composite multifunctional spray bar is designed to meet the medicine spraying requirements of different plant heights of soybean and corn in different growth periods in terms of the agronomic requirements of soybean and corn strip planting.The design of a dual variable spray system can meet the spraying requirements of soybean and corn at the same time.The system hardware selection mainly includes nozzles,drug pumps,flow sensors,pressure sensors,speed sensors,electric proportional valves,Arduino MEGA2560 development boards,USART HMI touch screens,etc.Based on the Arduino IDE development environment,the control system was written by the Arduino programming language,to determine the basic control structure,and complete the program development of the variable spray system.Based on the USART HMI development environment software,the human-computer interaction system is compiled by calling ASCII string format to mainly design the operation interface,add buttons,set action instructions,etc.4)The performance of the prototype was tested.The minimum turning radius of the prototype is 1.98m,the climbing performance meets the slope of 25°,the battery endurance is 2.94h,the spray device has no leakage,and the spray variation coefficient is up to 3.98%.All these parameters meet the national standard NY/T1925-2010"Technical Specification for Quality Evaluation of Boom Sprayers in Use".The test results show that the performance parameters of the electric self-propelled split boom sprayer basically meets the design requirements.