Design And Analysis Of The Highland Self-propelled Sprayer With Full Hydraulic Four-wheel Steering System

Highland self-propelled agricultural sprayer is a new agricultural plant protection machinery, the steering system performance directly affects the operational efficiency of the sprayer, the life of the tire. At present, the domestic self-propelled agricultural sprayers are mostly hydraulic steering wheel, rear wheel drive by servo steering lever, its turning radius is large and steering precision is low.When agricultural sprayer for steering radius is small, for pesticide sprayer efficiency have a serious impact, while the sprayer repeatedly forward,backwards, so that crops were rolling, affect crop yields.Taking a gap Heights self-propelled agricultural sprayer for the study, is not flexible for its steering, steering radius is too large and coincide with low degree of problem, devised a novel full hydraulic four-wheel steering system.The paper analyse the full hydraulic steering system works,and according to the requirements of the overall design of the sprayer to determine the steering gear, power steering cylinder, steering pumps and other hydraulic components relevant parameters after the simulation of the theoretical basis of the analysis.Secondly,building the main hydraulic components of the steering system mathematical model, and establishing semi-physical model of a steering hydraulic system based on the AMESim, and steering performance of dynamic simulation analysis at a different speed and load conditions steering.Turning radius is too large for the sprayer, front and rear track of different issues, the use of ADAMS software with automated optimization method, in VIEW module trapezoidal model parameterization process, and through the establishment of an objective function to determine the constraints on Trapezium to optimize such a steering system prototype was better meet ackerman steering principle;On the basis of it, the ADAMS/VIEW module to establish a physical prototype model sprayers by adding the appropriate drive torque simulation sprayer steady shift in the tire, its turning circle come from the trajectories can be found sprayers almost exactly coincide with a high degree of front and rear wheels, the turning radius is also greatly reduced, improving the sprayer steering sensitivity, steering mechanism to verify the optimization is valid. Finally, through the hydraulic steering system and steering track sprayer was tested and analyzed to verify the correctness of design and op timization this paper.