Design Of Soybean Profiling Header And Control System For Multi-crop Crawler Combine Harvester

As the main type of harvester in Huang-Huai-Hai Region,crawler combine harvester has excellent passability and field adaptability.In order to achieve soybean harvest,it is necessary to install soybean header on the existing crawler combine harvester.In view of the problems in the process of soybean harvesting,such as the mismatch between the header height and the height of soybean bottom pod,the limited profiling range of the traditional soybean header,and the unreal-time adjustment of reel’s horizontal position according to the field environment,this paper designs a soybean profiling header and control system based on the multi-crop crawler combine harvester,which realizes the adaptive control of the header height and the adjustment of reel’s horizontal position,effectively reduces the loss of the soybean header,and further improves the level of soybean mechanical harvesting.The main research works are as follows:(1)Based on the original rice-wheat rigid header,the structure of soybean profiling header is designed and improved,and the floating cutter is used to achieve the small range mechanical profiling.The simulation analysis of the floating cutter is carried out by using the multi-body dynamics simulation software Recur Dyn.The simulation result shows that the floating cutter has good ground profiling effect.The finite element static analysis of header hanging frame and spring plate of the soybean profiling header is carried out by using the finite element analysis software ANSYS Workbench,and the results can meet the design requirements of strength and stiffness.(2)Based on the method of sectional profiling,combined with mechanical profiling device and hydraulic profiling device,a soybean header profiling system with larger profiling range,stronger environmental adaptability is built.Through the detection of the header heigh,the automatic control of header height is realized.The simulation analysis of the device to detect the header height is carried out by using Recur Dyn.The main parameters of the reset torsion spring is determined and the problems of subsidence and pulsation of the profiling plate in the working process is solved.Through the analysis of the geometric relationship of the soybean header,the relationship between the variation of header height ΔH and the variation of the proportional valve opening time ΔT is derived,the soybean header profiling system based on the grey prediction adaptive fuzzy control method is established,and the automatic control of header height is realized.The control effect of the header profiling system is simulated and verified by using Simulink.(3)A control system is designed to adjust horizontal position of reel.The real-time adjustment of reel’s horizontal position is realized by combining the electric cylinder with the slider-crank mechanism.The original transmission mode of reel is changed.The limitation of the original belt transmission mode in adjustment process of reel’s horizontal position is solved by the combination of the hydraulic motor and the worm reduction gear.The optimal working speed of reel under different forward speeds is determined by analyzing the trajectory and speed of reel.The main technical parameters of the electric cylinder are determined through the force analysis of reel’s horizontal position adjustment device.The finite element static analysis of the right axis seat of reel is carried out by using ANSYS Workbench,and the verification results show that the device can meet the design requirements of strength and stiffness.(4)The trial production of soybean profiling header is carried out.The influence of working parameters of soybean header on working performance is analyzed by response surface experiments.The optimal working parameters combination of soybean header is obtained by response surface model,and the experimental verification is carried out.The changes of soybean cutting height under different conditions are compared,and the results show that the designed soybean header profiling system has better profiling effect than the traditional mechanical profiling device.