Experiment and method of maize ear threshing under airflow mixed impact

Authors

  • Yanan Li College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China
  • Xinping Li College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China
  • Jiarui Hou College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China
  • Junyi Wang College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China
  • Bin Peng College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China
  • Ruizhe Sun College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China

Keywords:

High velocity airflow, Low velocity airflow, Coupling, Impact, Corn threshing

Abstract

This study addresses the high breakage rates in the traditional mechanical processing of maize kernels. This paper examines force transfer and consumption within longitudinal and transverse force chain networks by integrating high-speed low-flow and low-speed high-flow methodologies. A mathematical model was developed, incorporating the concept of contact force. Using factors such as airflow impact angle, direction, and regions of maize ears as test variables, three-dimensional force values and threshing quantities were analyzed as key performance indicators. The investigation explored the relationship between three-dimensional forces, destructive forces, and these test factors while examining changes in primary impact forces. High-speed photography was employed to validate the established threshing rules and trajectories. Results indicated that contact forces among different regions of a maize ear were approximately equal. Under specified conditions, transverse threshing was more efficient than longitudinal threshing. The magnitude of the three-dimensional forces followed the order of Z-direction > Y-direction > X-direction, indicating that the predominant impact occurs primarily along the Z-axis. For the force values in each direction and region, the large sections exhibited the highest forces, followed by the middle sections, while the small sections displayed the lowest overall forces. Additionally, longitudinal three-dimensional force values exceeded those measured transversely. The destructive force resulting from longitudinal chain network fractures was greater than that from transverse chain network fractures. Furthermore, within each region, the destructive force was inversely proportional to the number of threshing rows. In contrast, across different regions, this value was positively correlated with the number of threshing rows. The rate of change in force values within each region directly correlated with the impact angle. High-speed photography revealed that the transverse threshing process follows a spiral trajectory, whereas the longitudinal threshing trajectory aligns with the axial direction. The movement trajectories of maize kernels are all similar to parabolic movements. This study fills a gap in the study of airflow threshing for high water-content maize.

Keywords: high velocity airflow, low velocity airflow, coupling, impact, maize threshing

DOI: 10.25165/j.ijabe.20261901.961110

Citation: Li Y N, Li X P, Hou J R, Wang J Y, Peng B, Sun R Z. Experiment and method of maize ear threshing under airflow mixed impact. Int J Agric & Biol Eng, 2026; 19(1): 11–20.

References

[1] Zhu X, Chi R J, Ma Y Q. Effects of corn varieties and moisture content on mechanical properties of corn. Agronomy, 2023; 13（2）: 545.

[2] Xie R Z, Ming B, Gao S, Wang K R, Hou P, Li S K. Current state and suggestions for mechanical harvesting of corn in China. Journal of Integrative Agriculture, 2022; 21（3）: 892–897.

[3] Li X P, Zhang W T, Xu S D, Du Z, Ma Y D, Ma F L, et al. Low-damage corn threshing technology and corn threshing devices: A review of recent developments. Agriculture, 2023; 13（5）: 1006.

[4] Xu J, Meng J H, Quackenbush L J. Use of remote sensing to predict the optimal harvest date of corn. Field Crops Research, 2019; 236: 1–13.

[5] Gu R L, Huang R, Jia G Y, Yuan Z P, Ren L S, Li L, et al. Effect of mechanical threshing on damage and vigor of maize seed threshed at different moisture contents. Journal of Integrative Agriculture, 2019; 18（7）: 1571–1578.

[6] Feng X, Wang L J, Bi S Y, Wang B, Ma Z, Gao Y. Effects of threshing devices, maize varieties and moisture content of grains on the percentage of maize grains broken in harvesting. Agronomy, 2023; 13（6）. DOI: 10.3390/agronomy13061615

[7] Zhang C, Geng D Y, Xu H, Li X, Ming J R, Li D X, et al. Experimental study on the influence of working parameters of centrifugal fan on airflow field in cleaning room. Agriculture, 2023; 13（7）. DOI: 10.3390/agriculture13071368

[8] Wang K R, Xie R Z, Ming B, Hou P, Xue J, Li S K. Review of combine harvester losses for maize and influencing factors. Int J Agric & Biol Eng, 2021; 14（1）: 1–10.

[9] Ma Z, Han M, Li Y M, Yu S C, Qian D A, Chandio F A. Comparing kernel damage of different threshing components using high-speed cameras. Int J Agric & Biol Eng, 2020; 13（6）: 215–219.

[10] Wang Y Z, Li L L, Gao S, Guo Y N, Zhang G Q, Ming B, et al. Evaluation of grain breakage sensitivity of maize varieties mechanically-harvested by combine harvester. Int J Agric & Biol Eng, 2020; 13（5）: 8–16.

[11] Dong W X, Wu Y S, Liu F, Hu H T, Yan J G, Bai H B, et al. Design and experiment of a harvesting header for wide-narrow-row corn. Applied Sciences-Basel, 2024; 14（3）: 14.

[12] Fu Q K, Fu J, Chen Z, Cui S B, Ren L Q. Experimental study on lodged corn harvest loss of small harvesters. Int J Agric & Biol Eng, 2022; 15（4）: 123–129.

[13] Zhang Z L, Geng A J. Development and evaluation of low-damage maize snapping mechanism based on deformation energy conversion. Applied Sciences-Basel, 2021; 11（24）: 17.

[14] Basuki M, Aprilyanti S, Azhari, Madagaskar. Design of corn thresher. Journal of Physics. Conference Series, 2020; 1500（1）. DOI: 10.1088/1742-6596/1500/1/012075

[15] Yang L, Cui T, Qu Z, Li K H, Yin X W, Han D D, et al. Development and application of mechanized maize harvesters. Int J Agric & Biol Eng, 2016; 9（3）: 15–28.

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

[17] Hussain S Z, Naik H R, Rather A H, Khan J. Comparative evaluation of horizontal maize cob sheller with traditional methods of maize shelling. Research on Crops, 2009; 10（1）: 168–170.

[18] Wang X F, Wang Y J, Zhao H B, Tao H T, Gao W, Wu Z Z, et al. Influence of hot-air drying on the starch structure and physicochemical properties of two corn cultivars cultivated in East China. Journal of Cereal Science, 2023; 114: 103796.

[19] Ghafori H, Hemmat A, Borghaee A M, Minaei S. Physical properties and conveying characteristics of corn and barley seeds using a suction-type pneumatic conveying system. African Journal of Agricultural Research, 2011; 6（27）: 5972–5977.

[20] Zhang C L, Zhang X Y, Zheng Z H, Xie X D, Liu L C, Chen L Q. Numerical simulation and test of the disturbance air suction garlic seed metering device. Machines, 2022; 10（12）: 1127.

[21] Zhao J L, Zhao H N, Tang H, Wang X G, Yu Y J. Bionic threshing component optimized based on MBD-DEM coupling simulation significantly improves corn kernel harvesting rate. Computers and Electronics in Agriculture, 2023; 212: 108075.

[22] Zhang H M, Chen B, Li Z J, Zhu C H, Jin E, Qu Z. Design and simulation analysis of a reverse flexible harvesting device for fresh corn. Agriculture, 2022; 12（11）: 1953.

[23] Yang F, Du Y F, Fu Q F, Li X Y, Li Z, Mao E R, et al. Design and testing of seed maize ear peeling roller based on Hertz theory. Biosystems Engineering, 2021; 202: 165–178.

[24] Dong J Q, Zhang D X, Yang L, Cui T, Zhang K L, He X T, et al. Discrete element method optimisation of threshing components to reduce maize kernel damage at high moisture content. Biosystems Engineering, 2023; 233: 221–240.

[25] Steponavičius D, Pužauskas E, Špokas L, Jotautienė E, Kemzūraitė A, Petkevičius S. Concave design for high-moisture corn ear threshing. Mechanics, 2018; 24（1）: 80–91.

[26] Zhang K, Cao S K, Chen X S, Cao C, Wu C Z. Design of longitudinal axial flow threshing and separating device of maize grain combine harvester. Applied Mechanics and Materials, 2017; 863: 251–254.

[27] Bakharev D, Pastukhov A, Volvak S, Kovalev S. Study of seed corn threshing process. Proceedings of the 19th International Scientific Conference Engineering for Rural Development, 2020.

[28] Fernando S D, Hanna M A. Design and development of a threshing chamber and pneumatic conveying and cleaning units for soybean harvesting. Transactions of the ASAE, 2005; 48（5）: 1681–1688.

[29] Pastukhov A G, Bakharev D N, Parnikova T V. Differentiated threshing of seed corn with minimal grain crushing. IOP Conference Series: Earth and Environmental Science, 2021; 659（1）: 012095.

[30] Li X P, Li Y N, Peng B, Xu S D, Wang J Y, Sun R Z, et al. Characteristics and numerical simulation of maize ear threshing under mixed airflow. Int J Agric & Biol Eng, 2025; 18（3）: 278–288.

[31] Li X P, Wang J Y, Li Y N, Xu S D, Hou J R. Fracture regularity of corn kernel and stalk based on fractal theory. Int J Agric & Biol Eng, 2025; 18（3）: 37–43.

[32] Li X P, Wu K, Jin X, Gao C Y, Gao L X. Analysis on discrete process of kernels caused by beak pecking corn ear by simulating threshing. Transactions of the CSAE, 2015; 31（18）: 34–40.

[33] Li X P, Ma L, Geng L X, Wang S S, Pang J, Ji J T. Performance test and parameter optimization of corn seed bionic thresher. Transactions of the CSAE, 2017; 33（5）: 62–69.

[34] Li X P, Zhang W T, Xu S D, Ma F L, Du Z, Ma Y D, et al. Calibration of collision recovery coefficient of corn seeds based on high-speed photography and sound waveform analysis. Agriculture, 2023; 13（9）. DOI: 10.3390/agriculture13091677

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Published

2026-03-16

How to Cite

(1)
Li, Y.; Li, X.; Hou, J.; Wang, J.; Peng, B.; Sun, R. Experiment and Method of Maize Ear Threshing under Airflow Mixed Impact. Int J Agric & Biol Eng 2026, 19.

Issue

Vol. 19 No. 1 (2026): IJABE

Section

Applied Science, Engineering and Technology

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