检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:付乾坤 付君 陈志[2,3] 任露泉[1,2] FU Qiankun;FU Jun;CHEN Zhi;REN Luquan(Key Laboratory of Bionic Engineering,Ministry of Education,Jilin University,Changchun 130022,China;College of Biological and Agricultural Engineering,Jilin University,Changchun 130022,China;Chinese Academy of Agricultural Mechanization Sciences,Beijing 100083,China)
机构地区:[1]吉林大学工程仿生教育部重点实验室,长春130022 [2]吉林大学生物与农业工程学院,长春130022 [3]中国农业机械化科学研究院,北京100083
出 处:《农业机械学报》2020年第4期60-68,共9页Transactions of the Chinese Society for Agricultural Machinery
基 金:国家自然科学基金项目(51705193);吉林大学研究生创新基金项目(101832018C008)。
摘 要:为探究刚柔耦合结构在玉米摘穗中的减损作用及机理,以板式摘穗机构和具有缓冲弹簧的轮式摘穗机构为2种基本结构,以刚性触穗表面和柔性触穗表面为2种基本表面,构建4种摘穗机构作为研究对象,进行摘穗速度下的玉米果穗碰撞试验,分析碰撞参数和籽粒损失情况。结果显示,刚柔耦合结构可有效改变碰撞参数,并降低果穗籽粒损失。缓冲弹簧可缩短果穗的碰撞时间,当轮式摘穗机构触穗表面分别为刚性、柔性材料时,碰撞时间比板式摘穗机构分别缩短62.2%、67.3%,碰撞冲量降低60.6%、76.0%,掉粒质量降低14.4%、25.6%。柔性触穗表面可降低果穗受到的冲击力,在板式和轮式摘穗机构上,柔性触穗表面的果穗碰撞时间比刚性触穗表面分别延长78.4%、53.8%,最大冲击力降低45.1%、55.2%,碰撞冲量降低19.9%、51.2%,掉粒质量降低34.1%、42.8%。本研究可为玉米摘穗割台的减损设计提供理论依据。A wheel type rigid-flexible coupling snapping device was designed to reduce kernel loss on corn head. There were two forms of rigid-flexible coupling structure in the device,namely,buffer spring and flexible contacting surface. The buffer spring was fixed to play a cushioning role when the snapping rolls were impacted by corn ear,and the flexible contacting surface was fixed on the snapping rolls to decrease hardness. In order to explore the different roles that two kinds of rigid-flexible coupling structure played in loss reducing of the designed snapping device,impact experiments of corn ear were conducted to study the mechanisms. The experiments were carried out on the widely used corn head with deck plates and the corn head with wheel type rigid-flexible coupling snapping device respectively. Each of the snapping devices was equipped with steel surface and flexible contacting surface composed of silicon rubber. The impact velocity was determined according to the typical working conditions of corn harvester.The impact parameters,including impact time,peak acceleration and impulse as well as the mass of detached kernels were collected. The result showed that buffer spring could shorten the impact time.Compared with snapping device equipped with deck plates,the impact time of corn ear on wheel type rigid-flexible coupling snapping device were shortened by 62. 2% and 67. 3%,corresponding to steel surface and flexible surface,respectively. Moreover,the impulse was decreased by 60. 6% and 76. 0%,and the detached kernels mass was decreased by 14. 4% and 25. 6%. On the other hand,flexible surface could reduce the ear’s impact force by prolonging impact time. Compared with the steel surfaces,impact time of corn head with flexible contacting surfaces were prolonged by 78. 4% and 53. 8% corresponding to corn head with deck plates and the one with wheel type rigid-flexible coupling snapping devices,respectively,which caused the declines of peak impact force by 45. 1% and 55. 2%,impulse reduction by 19. 9% and 51. 2%,re
分 类 号:S225.51[农业科学—农业机械化工程]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.222