Mechanism and experimental study on the fruit detachment of Chinese wolfberry through reciprocating vibration

Song Mei, Jinpeng Wang, Zhiyu Song, Dunbing Tang, Cheng Shen

Abstract


In order to realize the efficient and high-quality mechanical picking for Chinese wolfberry, firstly, the forcedreciprocating vibration picking principle of the Chinese wolfberry branch was studied, and the mechanical model of vibrationpicking was established based on the simplified cantilever model, and the response analysis and solution of all positions for thebranch were carried out. At the same time, the critical mechanical model of fruit detachment under the condition of fruithanging on branches was established, and the theoretical values of inertia force for each component of the branch wereobtained. Secondly, through actual measurement and finite element modeling, the natural frequency and forced vibrationresponse simulation for each component of the branch of Chinese wolfberry terminal branch model were both studied, and therelationship between single-point periodic excitation force and high-quality fruit shedding parameters was obtained. Thirdly,according to the conclusion of the picking model, a test bench with many groups of adjustable parameters was built. Finally, thelast branch of fruit-hanging Chinese wolf berry for Ningqi No.1 was taken as the experimental object, a four-level orthogonalexperiment was designed with three factors: frequency, amplitude and entrance angle. Meanwhile, the net picking rate, damagerate and false picking rate were taken as the evaluating indicators, referring to the comprehensive scores of the three factors. Itwas concluded that the primary and secondary relations of factors affecting the picking effect are frequency, amplitude andentrance angle, and the best operation parameters are frequency of 20 Hz, amplitude of 15 mm, and entrance angle of 45°, then,a hand-held vibration picker with setting parameters was trial-produced, and the optimal parameter combination was verified inthe Chinese wolfberry planting base of the National Chinese wolfberry Engineering and Technology Research Center. Theresults showed that the net picking rate of ripe Chinese wolfberry was 96.13%, the damage rate of fruit was 1.13%, and thefalse picking rate was 3.23%, mechanized picking efficiency was 30.28 kg/h, which is 6.65 times that of manual picking. Theexperimental results are consistent with the simulation results. The research results can provide an important basis for thecreation and operation standards of large-scale Chinese wolfberry vibration harvesting equipment.
Keywords: Chinese wolfberry branches, reciprocating vibration, inertial force, orthogonal experiment
DOI: 10.25165/j.ijabe.20241702.8482

Citation: Mei S, Wang J P, Song Z Y, Tang D B, Shen C. Mechanism and experimental study on the fruit detachment ofChinese wolfberry through reciprocating vibration. Int J Agric & Biol Eng, 2024; 17(2): 47–58.

Keywords


Chinese wolfberry branches, reciprocating vibration, inertial force, orthogonal experiment

Full Text:

PDF

References


Amagase H, Farnsworth N R. A review of botanical characteristics, phytochemistry, clinical relevance in efficacy and safety of Lycium barbarum fruit (Goji). Food research international, 2011; 44(7): 1702–1717.

Ma J W. Research status and prospect of the mechanized technology of picking wolfberry in China. Mechanical Research & Application, 2017; 30(4): 151–153. (in Chinese)

Cao L, Zhang A L. Study on present situation development stages and trends of Chinese wolfberry industry. Forest Resources Management, 2015; 2: 4–8, 30. (in Chinese)

Li Q, Ye L Q, An W. The suitable working of wolfberry harvest machine. Journal of Agricultural Mechanization Research, 2009; 6: 126–128. (in Chinese)

Shi Z G, Xiao H R, Wan R, Zhang Z, Wang Y J, Mei S, et al. Research progress of Chinese wolfberry picking machine. Agricultural Science & Technology and Equipment, 2016; 263(5): 53–56. (in Chinese)

Li C, Xing J J, Xu L M, He S L, Li S J. Design and experiment of wine grape threshing mechanism with flexible combing striping monomer. Transactions of the CSAE, 2015; 31(6): 290–296. (in Chinese)

Ye L Q, Li Q, Chen J Y, An W. Study on picking performance of portable wolfberry picker. Ningxia Journal of Agriculture and Forestry Science and Technology, 2009; 4: 4–5, 56. (in Chinese)

Zhao Y, Xiao H R, Wang X J, Shi Z G, Mei S, Ding W Q. Design and fruit drop experiment of 4GQB-3300 Lycium L. harvester based on standardized planting mode. Journal of Chinese Agricultural Mechanization, 2019; 40(6): 43–51. (in Chinese)

Li C S, Gao Z J, Kan Z, Wang L H, Yuan P P, Wang Z. Experiment of fruit-pedicle vibration separation of wine grape. Transactions of the CSAE, 2015; 31(9): 39–44. (in Chinese)

Wang C Q, Xu L Y, Zhou H P, Cui Y M, Cui H. Development and experiment of eccentric-type vibratory harvester for forest-fruits. Transactions of the CSAE, 2012; 28(16): 10–16. (in Chinese)

Song Z Y, Mei S, Xiao H R, Shi Z G, Wang J P, Zhao Y, et al. Comparative test and analysis on the harvesting methods of Chinese wolfberry fruit. Journal of Chinese Agricultural Mechanization, 2019; 40(10): 110–116. (in Chinese)

Wang J P, Mei S, Xiao H R, Zhao Y, Zhou H P. Research on mechanized harvesting methods of Chinese wolfberry Fruit. IFAC-PapersOnLine, 2018; 51(17): 223–226.

Zhang Z, Xiao H R, Ding W Q, Mei S. Mechanism simulation analysis and prototype experiment of Chinese wolfberry harvest by vibration mode. Transaction of the CSAE, 2015; 31(10): 20–28. (in Chinese)

Xu L M, Chen J W, Wu G, Yuan Q C, Ma S, Yu C C, et al. Design and operating parameter optimization of comb brush vibratory harvesting device for wolfberry. Transactions of the CSAE, 2018; 34(9): 75–82. (in Chinese)

Hu M M, Wan F X, Du X L, Huang X P. Design of vibrating wolfberry picking machine. Journal of Chinese Agricultural Mechanization, 2018; 39(7): 25–29. (in Chinese)

Mei S, Xiao H R, Shi Z G, Jiang Q H, Zhao Y, Ding W Q. Design and test of low-loss Lycium barbarum harvesting technology and equipment based on reciprocating vibration method. Journal of Chinese Agricultural Mechanization, 2019; 40(11): 100–105, 208. (in Chinese)

Zhang Z. The design and experiment of Lycium barbarum harvesting mechanism by vibration mode. Nanjing: Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture Affairs, 2016. (in Chinese)

Zhang Y M. Mechanical vibrations (Second edition). Beijing: Tsinghua University Press, 2017. (in Chinese)

Bao Y D. Research on vibration characteristics and numerical simulation of blueberry mechanization harvesting. Northeast Forestry University, 2015. (in Chinese)

Cooke J R, Rand R H. Vibratory fruit harvesting: A non-linear fruit-stem dynamics. J Agric Engng Res, 1970; 15(4): 347–363.

Zhao J. Key technologies of vibrating and comb brushing harvesting for Lycium barbarum L. Northwest A&F University, 2022. (in Chinese)

Peng Y, Zhang Z Y, Liu Y, Xu T S, Wang R J. Design and experiment of accurate clamping vibration wolfberry harvesting machine. Mechanical Research & Application, 2018; 31(6): 123–129, 132. (in Chinese)

Zhang W Q, Zhang M M, Zhang J X, Li W. Design and experiment of vibrating wolfberry harvester. Transactions of the CSAM, 2018; 49(7): 97–102. (in Chinese)

Zhang W Q, Li Z Z, Tan Y Z, Li W. Optimal design and experiment on variable pacing combing brush picking device for Chinese wolfberry. Transactions of the CSAM, 2018; 49(8): 83–90. (in Chinese)




Copyright (c) 2024 International Journal of Agricultural and Biological Engineering

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

2023-2026 Copyright IJABE Editing and Publishing Office