Optimization Design and Experiment of Reciprocating Tea Vibrating-sifting Machine

WANG Xiaoyong, YU Zhi, NI Dejiang


Tea is a kind of global beverage, the mechanized tea refining operation is an important part of the entire tea mechanization process. Vibrating-sifting is an integral part of tea refining, which directly affects the purity of tea. In view of the unclear mechanism of vibrating-sifting in the process of tea vibrating-sifting, there are problems such as broken tea and hanging mesh, which affect the vibrating-sifting efficiency. The motion law of tea on the screen bed was researched, the dynamic model of the three-stage screening process of tea moving up and down along the screen bed was established, which was thrown up from the screen surface and colliding after falling to the screen hole, combined the motion law of tea on the screen bed, a simulation model of tea screen bed was established through EDEM, and the speed and force of tea on the screen bed were analyzed. The best parameters were crank radius, rotating speed of the crank and the inclined angle of the screen surface. Finally, through the orthogonal test of three factors and three levels, the software Design-Expert was used to analyze and optimize the experimental data and determine the optimal parameters. The significance order of each factor on the error screening rate and productivity was obtained. The order of significance for the error-sifting rate was the inclination angle of sifting bed, crank speed and crank radius, while the significant order of the productivity was the inclination angle of sifting bed, crank speed and crank radius. When the crank speed was 247.99r/min, the inclination angle of the sieve bed was 2.60°, the crank radius was 23.11mm, the error screening rate and productivity were 5.3% and 440kg/(m2·h), respectively, compared with the optimization result, the error was within the allowable range. The research result had a significant reference value for improving the screening efficiency of vibrating-shifting machine for tea.

Keywords: tea vibrating-sifting machine, vibrating-sifting mechanism, EDEM  orthogonal test


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LIU Qi,OUYANG Jian,LIU Changwei,et al. Research progress of tea quality evaluation technology[ J ]. Journal of Tea Science, 2022,42(3) :316 -330. (in Chinese)

WANG Huajie,HUA Jinjie,YU Qinyan,et al. Widely targeted metabolomic analysis reveals dynamic changes in non-volatile and volatile metabolites during green tea processing [J] . Food Chemistry ,2021 , 363:130131.

XU Qiang,YANG Yi,HU Kelin,et al. Economic, environmental, and emergy analysis of China’s green tea production [ J ]. Sustainable Production and Consumption,2021 ,28;269 -280.

HORABIK J, MOLENDA M. Parameters and contact models for DEM simulations of agricultural granular materials: a review [J] . Biosystems Engineering,2016,147 :206 -225.

FENG Xin,GONG Zhenpin,WANG Lijun,et al. Behavior of maize particle penetrating a sieve hole based on the particle centroid in an air-screen cleaning unit [J ]. Powder Technology,2021 ,385( 10) ;501 -516.

WANG Lijun,CHAI Jin, WANG Housheng,et al. Design and performance of a countersunk screen in a maize cleaning device [J] . Biosystems Engineering,2021 ,209;300 -314.

NING Xinjie,JIN Chengqian, LIU Peng,et al. Research on screening performance of double layer vibrating screen for soybean harvester based on discrete element method [J]. American Journal of Agricultural Research ,2019 ,68 (4) :1 - 17.

WEI Zhongcai, LI Hongwen,MAO Yijin,et al. Experiment and analysis of potato-soil separation based on impact recording technology [J] . International Journal of Agricultural and Biological Engineering ,2019 ,12 ( 5 ) ;7 1 -80.

YEOUN G P, SANG H K. Transport velocity of perilla grain on oscillating sieve in elliptical motion! J j. Journal of Biosystems Engineering,2018 ,43 ( 3 ) : 194 - 201.

SIIANMUGAM В К, VARDHAN H, RAJ M G,et al. Investigation on the operational parameters of screening coal in the vibrating screen using Taguchi L27 technique[ J ]. International Journal of Coal Preparation and Utilization ,2021 ,42( 11 ) :3282 - 3291.

MONCADA M M. RODRIGUEZ С G. Dynamic modeling of a vibrating screen considering the ore inertia and force of the ore over the screen calculated with discrete element method [J] . Shock and Vibration ,2018,12:1 - 13.

ZHAO Lala,ZHAO Yuemin,LIU Chusheng,et al. Simulation of the screening process on a circularly vibrating screen using 3D - DEM[ J]. Min. Sci. Technol. ,2011,21(5) :677 -680.

ZIIAO Zhangfeng,ZHU Hejia,CHEN Guoda,et al. Analysis of influence factors on the sieving efficiency in tea vibration sieving J . Agriculture Research,2019 ,8(2) ;279 -286.

HUANG Jianhong,CHENG Bin,JIANG Xiaoliang,et al. Automated production line technology applied on refined tea screening [J]. China Tea Processing,2016(6) :56 —61. (in Chinese)

XIE Jun,ZHANG Xiaoqing, WANG Chengjun. Tea sieving based on three translation parallel mechanism [ J ]. Transactions of the Chinese Society for Agricultural Machinery ,2012 ,43( 10) : 101 - 104. ( in Chinese)

WANG Chengjun,ZHANG Tianyu,ZHENG Yan,et al. Simulation study on the screening of the reciprocating roller screen with

two degrees of freedom for tea [ J ]. Journal of Tea Science,2016 ,36( 6) : 613 -620. (in Chinese)

ZHANG Kaixing,WANG Wenzhong, ZHAO Xiuyan,et al. Design and experiment of drum-type hot air re-dryer for tea [ J]. Transactions of the Chinese Society for Agricultural Machinery ,2020 ,5 1 ( 5 ) : 377 -386. (in Chinese)

LI Bing, LI Weining,BAI Xuanhing,et al. Research on screening rate of fresh tea leaves classifier based on EDEM[ J], Journal of Tea Science,2019,39(4) ;484 -494. (in Chinese)

L0 Haowei,WU Chuanyu,TU Zheng,et al. EDEM-based optimization of classification parameters of machine-picked tea fresh leaf vibratory classi(ier[ J ]. Journal of Tea Science,2022,42( 1 ) ; 120 — 130. (in Chinese)

QIN Kuan,BU Kunting,SHEN Zhougao,et al. Optimization design and experiment of continuous compound tea leaf barber [J] . Transactions of the Chinese Society for Agricultural Machinery, 2023,54(3) :382 -393. (in Chinese)

W ANG Lijun,CUI Youqiang,ZHENG Zhaohui,et al. Effect of different motion forms of vibrating screen on screening of particle group [J]. Transactions of the Chinese Society for Agricultural Machinery ,2019 ,50 (6) ; 119 — 129. (in Chinese)

FENG Xin,WANG Lijun,YU Kunmeng,et al. Design and experiment of mechanism of wave screen for maize grain cleaning [J] .Transactions of the Chinese Society for Agricultural Machinery ,2023 ,54 (4) : 142 - 154. (in Chinese)

W ANG Lijun,YU Yongtao,ZHANG Shuai,et al. Motion characteristics of maize mixture on bionic screen based on earthworm motion characteristics [ J ]. Transactions of the Chinese Society for Agricultural Machinery, 2022, 53 ( 3 ) : 158 - 166. (in Chinese)


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