| China is a large agricultural production country,where the development of agriculture is extremely important.In the development of agricultural machinery,the Highland Gap Planters with functions such as fertilization and spraying are extremely popular.With a wide range of applications,high operational efficiency,and the ability to spray a wide range of crops,the Highland Gap Planters are highly economical and are ideal among agricultural machinery.Chemical control is the most important kind of crop control,Highland Gap Planters can fertilize and spray crops,with its development having a very significant significance to the development of agriculture in China.In this paper,the steering system in the upland gap planters is studied.As the steering system of the four-cylinder control steering system is too costly and the synchronization of the steering mechanism is not good enough,the steering mechanism of the laboratory’s generation upland gap planters is analyzed and optimized and the steering hydraulic system is redesigned.As for the design of the steering mechanism,Solid Works2016 was used to model the3WP-750 upland gap planters,and the motion analysis of its steering mechanism was carried out,with the displacement and speed of the steering cam handle and push rod connection point simulated using MATLAB software,the simulation concluded that the synchronization problem of the steering mechanism was difficult to solve,hereby Design-exper software was used in combination with box-behnken response surface analysis to optimize the length of the steering mechanism and the mounting position of the cylinder to better meet the synchronization of the front and rear wheels.In combination with the operating environment and test of the upland gap planters,the optimized design of the previous four-cylinder steering system was found to be difficult to solve the steering system synchronization problem,and the double-cylinder tandem steering hydraulic system was redesigned and optimized,which was found to basically meet the synchronization of the left and right cylinders through the experiment.The simulation model of the two-cylinder tandem steering hydraulic system was established,and the simulation of the main components,such as the steering gear,was completed based on the AMESIM software simulation.By adding different friction forces to the steering cylinders to simulate the load conditions under various environments,the steering cylinder feeds 43.87 bar and returns 12.19 bar in concrete and 112.2 bar and returns7.46 bar in mud.Analyzing the hydraulic steering system under different steering wheel speeds and different load conditions,the two-cylinder tandem steering hydraulic system meets the design synchronization requirements,with good synchronization of the left and right cylinders.Finally,the 3WP-750 upland gap planters were tested for steering performance and synchronization in concrete and paddy fields respectively.Basically,the cylinder flow rate was around 22L/min,which was basically similar to its simulation results,resulting in good steering performance and synchronization accuracy within 3%,with high synchronization accuracy.The steering system of the plant protection machine is stable and reliable,which not only verifies the accuracy of the simulation,but also validates the correctness and rationality of the design of this paper,with reference significance for the research of the steering system of the plant protection machine. |
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