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| 1 | 花生联合收获青贮机秧捆包膜装置设计与试验显示文摘针对我国花生秧蔓包膜青贮设备自动化程度低、无法实现花生果秧联合收获的问题,在4HB2A型花生联合收获机的基础上,增设了固定式秧捆包膜装置。选择宽25 cm、厚25μm的聚乙烯拉伸膜,通过分析其拉长率和包膜重叠率,确定秧捆包膜时拉伸膜拉长率和包膜重叠率均为50%。根据拉伸膜拉长率的要求设计导膜机构,通过导膜机构受力分析得出扭转弹簧扭转角大于68°,导膜辊绕膜角大于108°。基于对秧捆规格、拉伸膜横向收缩率及包膜重叠率的分析,确定装置旋转和秧捆自转的角速度比为18,通过对包膜装置传动配合关系和承载滚筒的设计,使装置旋转和秧捆自转的角速度比达到预期值。基于ASAMS对包膜装置气压缸推动提升角度进行仿真,确定装置提升角为66°。样机田间性能试验表明,所设计的固定式包膜装置拉伸膜拉长率为51.4%,包膜2、4、6层的包膜效率分别为10.5、8.4、7.6 s/层,均匀性变异系数分别为12.20%、7.70%和4.70%,各项指标均符合标准要求,包膜质量满足花生秧蔓青贮要求。 | 杨然兵 王政增 尚书旗 陈明东 王婕 王志超 | 2020 | 农业机械学报2020，51，8： | 4 |
| 2 | Contact parameter analysis and calibration in discrete element simulation of rice straw显示文摘Discrete element method was used to study and analyze the interaction between rice straws and between rice straw and agricultural machinery parts,thereby providing a scientific basis for post-harvest paddy field processing.Calibrations of rice straw-rice straw,rice straw-agricultural machinery part contact parameters(collision recovery coefficient,static friction coefficient and rolling friction coefficient)constitute an important prerequisite for the discrete element research process.In this study,the collision recovery coefficients of rice straw-steel and rice straw-rice straw were 0.230 and 0.357,respectively,which were calibrated by the collision method.The static friction coefficient and rolling friction coefficient of rice straw-steel were 0.363 and 0.208 respectively,which were calibrated by the inclined plate method and the slope method.The static friction coefficient and rolling friction coefficient of rice straw-rice straw were 0.44 and 0.07,respectively,which were calibrated by the split cylinder method.The paired t-test showed insignificant differences between calibration parameter simulation results and the physical test values(p>0.05).Taking the angle of repose that reflecting rice straw flow and friction characteristics as the evaluation index,the verification tests of the above calibration values indicated that the simulated angle of repose has no significant difference from the physical test value(p>0.05).The side plate lifting test on rice straw of different lengths showed no significant difference between the simulated angle of repose and the physical test value(p>0.05).This study can provide a basis for contact parameters choice in discrete element simulation analysis with rice straw-rice straw and rice straw-agricultural machinery parts as the research object.The calibration method can provide a reference for the contact parameter calibration of other crop straws. | Honglei Jia Jiayu Deng Yanling Deng Tianyou Chen Gang Wang Zaijin Sun Hui Guo | 2021 | International Journal of Agricultural and Biological Engineering2021，14，4： | 2 |
| 3 | Design and parameter optimization of spiral-dragon type straw chopping test rig显示文摘In order to address the problems of large chop length,high energy consumption and poor chopping effect that were associated with a horizontal total mixed rations(TMR)mixer,a straw chopping device was designed;further,its structure and working principle were analyzed.In this study,wheat straw was chosen as the test object.The number of processing times,number of fixed blades,cutting speed,number of tooth plates and the inclined angle of the box were considered as the test factors.The standard straw length rate and average power were used as evaluation indices for conducting the orthogonal rotation combination experiment with five factors and five levels of quadratic regression.The experimental results denoted that the order of influencing factors on the standard straw length rate can be given as follows:the number of processing times,number of fixed blades,cutting speed,number of tooth plates and inclined angle of the box.The order of the influence of each factor on the average power can be given as follows:the cutting speed,number of fixed blades and number of tooth plates.Further,the optimum structural and working parameters of the device can be determined as follows:linear cutting speed of 17-20 m/min,box inclined angle of 70°-80°,20-23 fixed blades,5-6 processing times and 4-7 tooth plates.Under such a circumstance,the standard straw length rate reached up to 70.5%-77.4%and the average power was low at 5.8-7 kW.The results can be used as reference for designing a chopping device for a TMR mixer. | Pengbo Ma Liqiao Li Baoqin Wen Yunheng Xue Za Kan Jingbin Li | 2020 | International Journal of Agricultural and Biological Engineering2020，13，1： | 1 |
| 4 | Developments of crawler steering gearbox for combine harvester straight forward and steering in situ显示文摘Soil compaction and accumulation are caused by crawler steering.Soil characteristics would affect the ability of crawler straight forward and steering in situ.This paper studied the principle of straight forward steering and steering in situ mode of traditional unilateral brake steering gearbox of a crawler combine harvester.Then a positive and negative steering gearbox model was developed and processed.The performance of positive and negative steering gearbox was analyzed by performing two steering modes on soil compaction effect.Results showed that the positive and negative steering gearboxes can achieve three operating modes,such as straight forward,unilateral brake steering,and positive and negative steering in situ.The positive and negative steering in situ was smooth and without soil accumulation phenomenon.When the crawlers center distance,crawler grounding length,crawler width were 1150 mm,1620 mm and 450 mm respectively,the rolling area and the scratch free area of positive and negative steering gearbox were 5.37 m2 and 0.36 m2 respectively.However,the rolling area and the scratch free area produced by unilateral brake steering gearbox were 13.92 m2 and 1.88 m2 respectively,which was 8.55 m2 larger than that of positive and negative steering gearbox.The crawler with positive and negative steering gearbox has minor damage to paddy soil.This research can provide a theoretical basis for the smooth steering in situ and structural optimization of the crawler steering gearbox. | Zhong Tang Haotian Zhang Hongchang Li Yaoming Li Zhao Ding Jinsong Chen | 2020 | International Journal of Agricultural and Biological Engineering2020，13，1： | 1 |
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