Design and Experiment of Two-degree-of-freedom Canopy Shaking Equipment Based on 5R Parallel Mechanism

DU Xiaoqiang, HAN Xintao, SHEN Tengfei, LI Songtao, HE Leiying

Abstract

Vibratory harvesting is an efficient form of mechanized harvesting of tree fruits. In the existing excitation form, non-circular excitation can produce effective vibrations in fruit trees, which can achieve an overall harvesting effect. In order to further improve the harvesting efficiency of fruits, the trajectories of different types of cycloid in non-circular excitation were researched in depth. Fruit tree flexible body models were built through SolidWorks, ANSYS, ADAMS and other software. The cycloid displacement loads of different trajectory parameters were imported into ADAMS, being applied to the excitation point of fruit tree model. By comparing the responses of the tree model to the cycloid displacement loads of different trajectories, the 3-branch No. 1 epitrochoid trajectory E was determined as the optimal excitation trajectory. According to the optimal excitation trajectory, a two-degree-of-freedom canopy shaking equipment driven by a 5R parallel mechanism was designed. The Camellia oleifera-tree was used as the shaking object, and the excitation frequency of 6Hz and amplitude of 90mm were determined. An experiment prototype was designed and built. Experimental results showed that the shaking rod layout with 7×7 staggered distribution was the optimal layout, and the average synthetic acceleration of the canopy under this layout was 22.38m/s2. The excitation acceleration transmission efficiency under the shaking rod layout was 77.63%, which verified the effectiveness of the two-dimensional excitation trajectory.


Keywords: vibrating harvester, cycloid trajectory, 5R mechanism, excitation trajectory, shaking rod layout, acceleration transmission efficiency

 

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LIN Huan,SUN Leihou,WANG Erhua. Development and application status and prospect of forest fruit vibratory harvester in China[ J]. Jiangsu Agricultural Sciences, 2021 ,49( 1 ) ; 36 -42. (in Chinese)

LIU Yang, WANG Honghong,LIU Ying,et al. Research progress on mechanical harvesting and sorting of forest fruits [ J]. World Forestry Research, 2020,33(3) :20 -25. (in Chinese)

FU Wei,GUI Jian, ZHANG Huiming,et al. Research and progress of mechanized harvesting technology of forest fruit [ J ]. Journal of Agricultural Mechanization Research, 2016 ,38 ( 12) ;264 -268. (in Chinese)

LIU Jinnan. Research status and development trend of harvesting machine based on vibration mechanism[ J ]. Agricultural Technology and Equipment, 2018(3) :84 —85. (in Chinese)

ZHENG Dongchen, SONG Xin, JI Pengfei, et al. Design of landing forest fruit harvesting robot J ]. Journal of Tianjin Agricultural University, 2020,27(4) ;68 -72. (in Chinese)

CHEN Zebin. Research status of vibratory forest fruit harvesting technology[ J ]. Mechanical Engineer, 2021 ( 1 ) :21 -24. ( in Chinese)

ZHOU Yuanhang,KAN Za,LI Chengsong,et al. Research and progress on fruit picking technology of landing forest fruit[ J ] - Journal of Agricultural Mechanization Research, 2017 ,39 ( 1 ) : 256 -263. (in Chinese)

SONG Shumin,ZHAN Xiaomei.PANG Youlun. Analysis on the development status and trend of orchard management machinery J]. Modern Agricultural Equipment, 2010(7) :58 -59. (in Chinese)

SAN Xunlong,YANG Huimin,WANG Xuenong,et al. Dynamic response of apricot fruit shedding during vibratory harvesting [ J]. Transactions of the CSAE, 2018 ,34( 18 ) : 68 - 75. (in Chinese)

DUAN JieIi,LU Huazhong, WANG Weizu,et al. Present situation and development of the fruit harvesting machinery [ J ]. Guangdong Agricultural Sciences, 2012 ,39 ( 16) : 189 - 192. (in Chinese)

ARISTIZABAL T I D, 0L1VER0S T С E, ALVAREZ M F. Mechanical harvest of coffee applying circular and multidirectional vibrations[ J]. Transactions of the ASAE, 2003, 46(2) :205.

BENTAHER H, HADDAR M, FAKHFAKH T, et al. Finite elements modeling of olive tree mechanical harvesting using different shakers [ J]. Trees-Structure and Function, 2013, 27(6) ; 1537 - 1545.

LENKER D H, HEDDEN S L. Optimum shaking action for citrus fruit harvesting[ J ]. Transactions of the ASAE, 1968, 11(3) : 347 -349.

XU Nannan. Design and experiment on vibratory fruit harvesting meclianism with three-dimensional excitation[D ]. Hangzhou; Zhejiang Sci-Tech University, 2018. (in Chinese)

ERDOGAN D, GUNER M, DURSUN E, et al. Mechanical harvesting of apricots [ J]. Biosystems Engineering, 2003, 85 ( 1 ) : 19 -28.

SUMNER H R, HEDDEN S L. A tractor-drawn rake for oranges[ J]. Transactions of the ASAE, 1981 , 24(6) ; 1396 - 1399.

LIU Lei,NIU Changhe, LIU Xuanfeng, et al. Development status and analysis of sea buckthorn harvester [ J ]. Xinjiang Agricultural Mechanization, 2010( 1 ) ;35 -37. (in Chinese)

WANG Yecheng,CHEN Haitao,FU Wei. Study on the physical and mechanical properties of blackcurrants [ J] . Journal of Northeast Agricultural University, 2009,40(3) ; 110 - 114. (in Chinese)

WU Delin, ZHAO Enlong, JIANG Shan, et al. Optimization and experiment of canopy vibration parameters of Camellia oleifera based on energy transfer characteristics [ J ]. Transactions of the Chinese Society for Agricultural Machinery, 2022, 53 (8) :23 - 33. (in Chinese)


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