Movement law of the threshing material in threshing and cleaning machine for plot-bred wheat

Fei Dai, Xuefeng Song, Ruijie Shi, Wenjuan Guo, Yiming Zhao, Feng Wang, Wuyun Zhao

Abstract


In order to clarify and enhance the work performance of the threshing and cleaning machine for plot-bred wheat and further reduce the grain retention in all working areas in the machine, in this study, a discrete element model for the threshing material of plot-bred wheat and a gas-solid coupling simulation model for the machine were established by ensuring all the harvesting criteria for the machine. Then numerical simulation was completed on the movement process of the threshing material in the threshing and cleaning machine for plot-bred wheat, the movement law and motion trajectory of all components of the threshing material were explored, and the impact forms of unreasonable work parameters on the separating and cleaning process were analyzed. First, four working areas were divided in the threshing and cleaning machine for plot-bred wheat. Under gas-solid flow coupling effect, the number variation of threshing material in each working area was analyzed under the effect of gas-solid coupling, and the operation characteristics of “no retained seeds and convenient cleaning” of the threshing machine for plot-bred wheat were further improved. The verification test results showed that, when the feeding amount of wheat was 0.30 kg/s, the rotation speed of the shaft of the tooth-type threshing cylinder was set to 1350 r/min, the rotation speed of the winnower was set to 500 r/min, the rotation speed of the residue absorption fan was set to 1000 r/min, the average total loss rate in threshing of the sample machine was 0.56%, and average impurity rate of the threshing material was 5.26%, average damage rate in threshing was 0.68%. In the test, the status of material discharged from the residue absorption fan outlet and bottom of the cyclone separator was similar to that of the simulation results, showing that it was feasible to use the method of gas-solid coupling to simulate the movement law of threshing material in the threshing and cleaning machine for plot-bred wheat.
Keywords: plot-bred wheat, threshing and cleaning machine, computational fluid mechanics, discrete element, numerical simulation, test
DOI: 10.25165/j.ijabe.20221503.7194

Citation: Dai F, Song X F, Shi R J, Guo W J, Zhao Y M, Wang F, et al. Movement law of the threshing material in threshing and cleaning machine for plot-bred wheat. Int J Agric & Biol Eng, 2022; 15(3): 100–106.

Keywords


plot-bred wheat, threshing and cleaning machine, computational fluid mechanics, discrete element, numerical simulation, test

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References


Zhu M, Chen H J, Li Y L. Investigation and development analysis of seed industry mechanization in China. Transactions of the CSAE, 2015; 31(14): 1–7. (in Chinese)

Shang S Q, Yang R B, Yin Y Y, Guo P Y, Sun Q. Current situation and development trend of mechanization of field experiments. Transactions of the CSAE, 2010; 26(Supp.1): 5–8. (in Chinese)

Dai F, Song X F, Zhao W Y, Han Z S, Zhang F W, Zhang S L. Motion simulation and test on threshed grains in tapered threshing and transmission device for plot wheat breeding based on CFD-DEM. Int J Agric & Biol Eng, 2019; 12(1): 66–73.

Fu J, Chen Z, Tian L Q, Han L J, Ren L Q. Review of grain threshing theory and technology. Int J Agric & Biol Eng, 2018; 11(3): 12–20.

Dai F, Zhao W Y, Han Z S, Li X K, Gao A M, Liu X L. Improvement and experiment on 4GX-100 type wheat harvester for breeding plots. Transactions of the CSAM, 2016; 47(S1): 196–202. (in Chinese)

Chang J G, Liu X B, Ye T, Du M J. Agricultural plot field trial breeding status and development of machinery. Journal of Agricultural Mechanization Research, 2011; 33(2): 238–241. (in Chinese)

Dai F, Zhang F W, Gao A M, Han Z S. Optimization of key operating parameters in 4GX-100 type cropland plot wheat seed combine harvester. Transactions of the CSAE, 2012; 28(Supp.2): 53–58.

Bart L, Bart M, Josse D B, Wouter S. LiDaR sensing to monitor straw output quality of a combine harvester. Computers and Electronics in Agriculture, 2012; 85(1): 40–44.

Wei L J. The design of plot wheat breeding threshing machine and research on it's low damage characteristics. Lanzhou: Gansu Agricultural University, 2016; 69p. (in Chinese)

Jin X, Du X W, Gan BX, Ji J T, Dong X, Wang G X. Cleaning performance experiment of cyclone separating system in miniature combine harvester. Transactions of the Chinese Society for Agricultural Machinery, 2016; 47(5): 99–105. (in Chinese)

Dai F, Song X F, Guo W J, Zhao W Y, Zhang F W, Zhang S L. Simulation and test on separating cleaning process of flax threshing material based on gas-solid coupling theory. Int J Agric & Biol Eng, 2020; 13(1): 73–81.

Li H C, Li Y M, Gao F, Zhao Z, Xu Li Z. CFD-DEM simulation of material motion in air-and-screen cleaning device. Computers and Electronics in Agriculture, 2012; 88(6): 111–119.

He Y, Bayly A E, Hassanpour A L. Coupling CFD-DEM with dynamic meshing: A new approach for fluid-structure interaction in particle-fluid flows. Powder Technology, 2018; 325: 620–631.

Ma L C, Wei L B, Pei X Y, Zhu X S, Xu D R. CFD-DEM simulations of particle separation characteristic in centrifugal compounding force field. Powder Technology, 2019; 343: 11–18.

Wang S Y, Li H L, Wang R C, Wang X, Tian R C, Sun Q J. Effect of the inlet angle on the performance of a cyclone separator using CFD-DEM. Advanced Powder Technology, 2019; 30(2): 227–239.

Jiang E C, Sun Z F, Pan Z Y, Wang L J. Numerical simulation based on CFD-DEM and experiment of grain moving laws in inertia separation chamber. Transactions of the CSAM, 2014; 45(4): 117–122. (in Chinese)

Liu L Y, Hao S Y, Zhang M, Liu D M, Jia F G, Quan L Z. Numerical simulation and experiment on paddy ventilation resistance based on CFD-DEM. Transactions of the CSAM, 2015; 46(8): 27–32. (in Chinese)

Oldal I, Safranyik F. Extension of silo discharge model based on discrete element method. Journal of Mechanical Science & Technology, 2015; 29(9): 3789–3796.

Dai F, Song X F, Shi R J, Zhao W Y, Guo W J, Zhang Y. Migration law of flax threshing materials in double channel air-and-screen separating cleaner. Int J Agric & Biol Eng, 2021; 14(3): 92–102.

Tong S G, Shen Q, Tang N, Jia Y P, Cong F Y, Gu W. Numerical simulation and optimization experiment of mixed flow field on longitudinal axial flow cleaning device. Transactions of the CSAM, 2016; 47(7): 135–142. (in Chinese)




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