| With the rapid development of modern agricultural technology,modern plant protection machinery is developing in terms of efficiency,intelligence,versatility,and extensive use of hydraulic technology to meet the needs of different operations.Therefore,it has been carried out in this paper that the design and research of the hydraulic system for the sprayer in Southern China.Through extensive readings of hydraulics,plant protection machinery and other related literature,and books,in-depth understanding of the application technology,the optimization of areas and deficiencies of hydraulic systems,combining the mechanical structure features of the sprayer in this paper,the research contents were determined and some results were achieved.Taking the high-gap self-propelled sprayer as the research object,considering the technical features of the traveling hydraulic system,those are described in the paper the technical features of the traveling hydraulic system.The schematic diagram and pipeline layout were designed using AutoCAD software,and the selection calculations of the walking pump and the walking motor were completed based on the kinematics and dynamics analysis of the walking system.At the same time,the control system and characteristics of the walking system were analyzed.Based on the operation requirements of the sprayer,a variety of steering modes were determined.Kinematics and dynamics analysis were performed based on the Ackermann principle and the mechanical properties of the steering system;At the same time,the steering hydraulic system of the sprayer was designed,the steering system was programmed and the steering angle control was analyzed and studied.Based on the characteristics of the mechanical structure and valve control system,the wheelbase adjustment and the frame lifting system scheme were designed and the main component selection calculations were completed.At the same time,the mathematical model of the valve control cylinder system was established and AMESim was applied to the simulation of valve-controlled cylinder system.The relationship was analyzed between thecontrol current of the proportional control valve and the displacement of the hydraulic cylinder.Based on the characteristics of the hydraulic synchronization system,the causes of the unsynchronized walking were analyzed;the synchronization scheme of the walking system was designed;the mathematical model and simulation model of the walking system were established,and simulation analysis of the traveling system with no diverter valve and diverter valve were made using AMESim.The models verified the feasibility of the diverter valve synchronization scheme,solving the unsynchronization of the walking system.Through the experimental research on the sprayer,taking the principle and mechanical structure of the hydraulic system of the whole machine in consideration,the experimental scheme of the walking and steering system was designed;Finally,the whole machine was tested.The results show that the synchronization accuracy of the walking system is controlled within 4%,and the results are basically consistent with the simulation datas.The maximum actual torques of the walking and steering motors are respectively 1711N·m and180N·m.The dynamic performance of the hydraulic system is verified. |
