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

摘要： 为提升玉米秸秆的利用率，以4JQH-120型号秸秆收集机为研究对象，通过选择不同刀具和排列方式设计三种能够与之搭配工作的捡拾器，分别是刀具都为“Y”型刀，采用双螺旋排布；刀具为锤爪和“Y”形刀依次混装，采用双螺旋排布；刀具为锤爪和“Y”形刀对称混装，采用双螺旋排布。通过ANSYS分别对三种捡拾器进行模态分析，仿真结果表明：最低阶数的固有频率为186.09 Hz，不在设计频率31.67~38.33 Hz内，不会产生共振。选定捡拾器种类、捡拾器转速和行驶速度3个因素，进行三因素三水平正交试验，利用EDEM-RecurDyn对捡拾装置部分进行联合仿真，明确秸秆被捡拾、破碎的机理。仿真结果表明：各捡拾器均不会发生应力变形；搭载DC捡拾器，在转速为2 300 r/min、行驶速度为0.6 m/s时，秸秆捡拾率最高，达81.85%。该研究可以为玉米秸秆收集机以及其他作物捡拾器的优化提供参考。

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