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獼猴桃采摘機器人末端執(zhí)行器設(shè)計與試驗
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國家自然科學(xué)基金資助項目(61175099)


Development and Experiment of End-effector for Kiwifruit Harvesting Robot
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    摘要:

    進行了棚架式栽培模式自然生長條件下簇生獼猴桃無損采摘機器人末端執(zhí)行器的研究?;诠麑嵟c果柄的分離特性,提出面向機器人的果實采摘方法和簡化幾何模型,,進行了果實與果柄分離試驗的可行性驗證;基于果實采摘方法設(shè)計了從底部接近,、旋轉(zhuǎn)包絡(luò)分離毗鄰果實并抓取,、向上運動分離果實的末端執(zhí)行器,并試制樣機,,進行了現(xiàn)場評價試驗,。結(jié)果表明,采摘模型能夠?qū)崿F(xiàn)果實與果柄的分離,,末端執(zhí)行器解決了毗鄰果實分離問題,,能夠?qū)崿F(xiàn)單個果實穩(wěn)定抓取、無損采摘和采后抓持,,成功率達到96.0%,,平均單果耗時22s。

    Abstract:

    Fruit nondestructive picking is one of the key technologies of developing harvesting robot. A nondestructive picking end-effector of kiwifruit was studied. Firstly, based on the artificial way of kiwifruit picking and the biology characteristics of kiwifruit stem, a fruit picking method for robot was proposed, which need to separate the fruit from stem and hold the fruit to prevent it dropping. Then, the picking method was verified by a special designed separation test of fruit and its stem. After that, an end-effector was designed and manufactured based on the fruit picking method, which approached a fruit from the bottom, and enveloped and grabbed the fruit from two sides, and then rotated up to separate the fruit from stem. In the end, the performance of end effector prototype was tested on the most common cultivar ‘Hayward’ at the Meixian Kiwifruit Experimental Station of Northwest A&F University. The results showed that the proposed picking method could separate the fruit successfully with the least force of 1.3N when the angle between fruit and stem was set as 60°, which is not significantly different from the manual picking of which the angle between fruit and stem is approximately to 90° in normal. The end effector was tested on 68 samples (28 in the morning, 25 in the noon, and 15 in the night). All of them were successfully picked and held by the end-effector. Among them, two samples were picked with stem which might be caused by the reason of that the fruit is not ripe enough to be harvested. All the picked fruit were free of damage until ripen for eating. In all, the end effector could effectively solve the problems of separating the adjacent fruits, grab a single fruit with an accuracy of 100%, and pick and hold it nondestructively. The success rate of picking was 96.0% and the average picking time was 22s.

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傅隆生,張發(fā)年,槐島芳德,李 楨,王 濱,崔永杰.獼猴桃采摘機器人末端執(zhí)行器設(shè)計與試驗[J].農(nóng)業(yè)機械學(xué)報,2015,46(3):1-8. Fu Longsheng, Zhang Fanian, Gejima Yoshinori, Li Zhen, Wang Bin, Cui Yongjie. Development and Experiment of End-effector for Kiwifruit Harvesting Robot[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(3):1-8.

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  • 收稿日期:2014-12-10
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  • 在線發(fā)布日期: 2015-03-10
  • 出版日期: 2015-03-10
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