关键词: 玉米秸秆, 捡拾器, 刀具排列方式, EDEM-RecurDyn耦合仿真, 正交试验, 多体动力学建模

Abstract: In order to improve the utilization rate of corn straw, the 4JQH-120 straw collection machine was taken as the research object. Three kinds of pickers that can work with it were designed by selecting different tools and arrangements. All pickers used “Y” shaped knives and adopted the double helix arrangement. The first type of picker consisted solely of “Y”shaped knives, while the second type combined hammer claws and “Y”shaped knives in a mixed arrangement. The third type of picker featured a symmetrical mixture of hammer claws and “Y”shaped knives. Through the modal analysis of the three pickers using ANSYS, the natural frequency of the lowest order was determined to be 186.09 Hz, which was not within the design frequency of 31.67-38.33 Hz and did not resonate. The three factors of picker type, picker speed, and travel speed were selected, and the threefactor and threelevel orthogonal experimental design was carried out. EDEMRecurDyn was used to jointly simulate the pickup device part to clarify the mechanism of straw being picked up and broken. The simulation results showed that no stress deformation occurred in any of the pickers. Equipped with a DC picker, the straw picking rate was the highest at a speed of 2 300 r/min and a travel speed of 0.6 m/s, achieving a rate of 81.85%.This study can provide reference for the optimization of corn straw collector and other crop pickers.

Key words: corn stalk, picker, tool arrangement, EDEM-RecurDyn coupling simulation, orthogonal test, mutibody dynamics modeling