猕猴桃采摘机器人末端执行器设计与试验
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国家自然科学基金资助项目(61175099)


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

    进行了棚架式栽培模式自然生长条件下簇生猕猴桃无损采摘机器人末端执行器的研究。基于果实与果柄的分离特性,提出面向机器人的果实采摘方法和简化几何模型,进行了果实与果柄分离试验的可行性验证;基于果实采摘方法设计了从底部接近、旋转包络分离毗邻果实并抓取、向上运动分离果实的末端执行器,并试制样机,进行了现场评价试验。结果表明,采摘模型能够实现果实与果柄的分离,末端执行器解决了毗邻果实分离问题,能够实现单个果实稳定抓取、无损采摘和采后抓持,成功率达到96.0%,平均单果耗时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,张发年,槐岛芳德,李 桢,王 滨,崔永杰.猕猴桃采摘机器人末端执行器设计与试验[J].农业机械学报,2015,46(3):1-8.

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  • 收稿日期:2014-12-10
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  • 在线发布日期: 2015-03-10
  • 出版日期: 2015-03-10