Design and Experiment of High-acid Apple Vibrating Picker

SHANG Shuqi, LI Chengpeng, HE Xiaoning, WANG Dongwei, WANG Haiqing, YANG Shuai

Abstract

In order to solve the problems of low efficiency, low fruit picking rate and large damage rate in the harvesting process of high-acid apples, a hydraulically controlled high-acid apple vibration picking machine was developed according to the actual harvesting needs of high-acid apples in Qingdao, China. Based on the working principle of vibrating picker, the structural design of vibrating picking device, excitation device and hydraulic control system was completed, and the clamping force of the clamping pliers on the trunk was calculated and analyzed to be 7254N, and the clamping height range of the clamping pliers was 12~103cm. The dynamic model of fruit-branch pendulum of high-acid apple was established, the fruit shedding conditions were analyzed, the differential equation of fruit vibration was obtained, and the vibration frequency, amplitude and clamping height were determined as the main influencing factors of picking effect. ANSYS software was used to simulate the free modal response and harmonic response of the fruit tree model, and the results showed that when the vibration frequency was 9~12Hz,the amplitude was 1~2cm, and the clamping height was 40~70cm, the displacement of the third-order and second-level branches was the most obvious. In order to determine the optimal working parameters of the picker, a three-factor three-level combination field experiment was carried out to obtain a regression model of fruit picking net rate and fruit damage rate, and the test data and regression model response surface were analyzed and optimized by Design-Expert software, when the vibration frequency was 10.0Hz, the amplitude was 1.6cm and the clamping height was 58.7cm, the fruit picking net rate was 95.9% and the fruit damage rate was 1.3%, which met the quality requirements of high-acid apple harvesting.


Keywords: high-acid apples, vibrating harvesting, hydraulic control, pendulum model

 

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LI Hongying, ZHANG Lei, ZHANG Xiaoyu, et al. Comprehensive quality evaluation of high-acid apples in northern China [C ] Proceedings of the 34th Annual Meeting of the Chinese Meteorological Society SI2 to Improve the Level of Meteorological Science and Technology and Ensure Agricultural Disaster Reduction and Efficiency ,2017; 1 -2. (in Chinese)

ZHU Qianfeng, LU Rongjie, LI Fengshun. Research status and development trend of apple picking machinery [ J ]. Forestry Machinery and Woodworking Equipment, 2021 ,49(5) :4 -9,15. (in Chinese)

LIU Jinbao. Design and analysis of forest fruit picking machine based on trunk vibration mechanism [ D]. Urumqi: Xinjiang Agricultural University,2014. (in Chinese)

WANG Changqin, XU Linyun, ZHOU Hongping, et al. Development and test of eccentric forest fruit vibratory harvester[ J ] . Transactions of the CSAE,2012 ,28( 16) ; 10 - 16. (in Chinese)

WU Delin, ZHAO Enlong, JIANG Shan, et al. Optimization and experiment of vibration parameters of Camellia oleifera fruit canopy based on double pendulum model [ J ]. Transactions of the Chinese Society for Agricultural Machinery ,2021 ,52( 12) : 96 -104. ( in Chinese)

WHITNEY J D, CHURCHILL D B, HEDDEN S L, et al. Trunk shakers for citrus harvesting. Part I; measured trunk shaker and tree trunk motion [ J]. Applied Engineer in Agriculture, 1988 ,4 ( 2 ) : 93 - 101.

W HITNEY J D, SMERAGE G H, BLOCK W A. Dynamic analysis of a trunk shaker-post system [ J ]. Transactions of the ASAE, 1990, 33(4) ; 1066 - 1070.

CASTRO-GARCIA S, BLANCO-ROLDAN G L, GIL-RIBES J A, et al. Dynamic analysis of olive trees in intensive orchards under forced vibration[ J]. Trees-structure and Function ,2008 ,22(6) ;795 -802.

WANG Yecheng, CHEN Haitao, LIN Qing. Optimization of parameters of blackcurrant harvesting deviee[J]. Transactions of the CSAE,2009,25(3) :79 -83. (in Chinese)

LANG Z. A fruit tree stability model for static and dynamic loadingfj]. Biosystems Engineering,2003 ,85(4) ;461 -466.

LANG Z. Dynamic modelling structure of a fruit tree for inertial shaker system design [ J ]. Biosystems Engineering, 2006, 93( 1 ) : 35 -44.

LANG Z. A one degree of freedom damped fruit tree model [j]. Transactions of the ASABE, 2008,51(3) : 823 -829.

AMIRANTE P, CATALANO P, GIAMETTA F, et al. Vibration analysis of an olives mechanical harvesting system [ J ]. Agricultural Engineering International ,2007 ,9 ( 7 ) :1 - 10.

ZHANG Hejun,WANG Junwei. Calculation and analysis of eccentric moments and excitation forces of several commonly used eccentric blocks[J]. Mining Machinery, 1999(6) ;68. (in Chinese)

FU Han, DUAN Jieli, CHEN Du, et al. Study on local target vibration harvesting method of fresh apple suitable for trellis tree shape [j]. Transactions of the Chinese Society for Agricultural Machinery ,2017 ,48 ( Supp. ) ;1 -7. (in Chinese)

YIN Xunchun. Design and optimization of vibrating walnut picking machine [ D ]. Harbin : Harbin University of Commerce, 2020. (in Chinese)

GAO Zicheng, ZHAO Kaijie, LI Lijun, et al. Design and experiment of suspended vibratory Camellia oleifera fruit picking mechanism [ J ]. Transactions of the CSAE ,2019 ,35 (21 ) :9 - 17. (in Chinese)

ZHENG Jiahong, LIU Mengfei, GAO Jing. Design and optimization of eccentric block structure in walnut picking machine J I . Journal of Chinese Agricultural Mechanization ,2014 ,35 ( 4 ) :44 -47. (in Chinese)

YANG Huimin, SAN Xunlong, CHEN Yifei, et al. Effects of different vibration characteristic parameters on vibration response of apricot trees [ J ]. Transactions of the CSAE ,2019 ,35 (2) ; 10 — 16. (in Chinese)


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