Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1923-1933.doi: 10.13229/j.cnki.jdxbgxb20190467

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Design and test of corn flexible threshing cylinder element

Duan-yang GENG1(),De-lei TAN1,Xing-rui YU1,Guo-liang SU1,Qian WANG1,Xiu-feng LU2,Cheng-qian JIN1   

  1. 1.School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
    2.College of Mechanical and Electrical Engineering, Shandong Career Development College, Jining 272000, China
  • Received:2019-05-17 Online:2020-09-01 Published:2020-09-16

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Abstract:

In order to solve the problem of high damage rate of maize kernels and high un-threshing rate during the corn harvest in Huang-Huai-Hai region, a transverse axial flow corn threshing test system is designed, which uses flexible tooth and elastic short rasp bar as the threshing elements. The flexible tooth material is polyurethane, which has high abrasion performance, and the elastic short rasp uses torsion springs as auxiliary elements so that can mitigate the force between the corn ear and rasp bar. With reasonable hypothesis, based on the Hertz contact theory, the stress equation of corn ear under the flexible nail tooth collision is established. Based on the rigid flexible coupling system theory, the force equation of the elastic short stripe and corn ear collision is established. The above analysis indicates that flexible tooth and elastic rasp bar have real potential as new threshing elements to mitigate the force between the corn ear and threshing elements. Through image processing, the corn ear contour map is established. Discrete element analysis software is applied to improve parameters design of elastic short rasp. Simulation experiments were carried out in accordance with the feeding volume of 10 kg/s, and the simulation results improve the device design. Finally, single factor test and optimum parameter combination contrast test were carried out with the rotational speed of cylinder, concave clearance and feeding rate as the test factors. The test results show that the device is superior to the conventional threshing device. It lays the foundation for the next field experiment.

Key words: agriculture engineering, corn, flexible threshing, mechanics analysis, DEM analysis, contrast experiment

CLC Number: 

  • S225.5

Fig.1

Structure of corn flexible threshing test bench for transverse flow"

Fig.2

Flexible cylinder structure and threshingelement arranged expanded view"

Fig.3

Schematic diagram of relationshipbetween concave sieve and roller"

Fig.4

Sketch of impact contacting between flexibletooth and corn ear"

Fig.5

Elastic rasp bar rigid-flexible coupling system"

Fig.6

Flow of corn ear modeling"

Fig.7

Discrete element simulation process"

Fig.8

Analysis of normal contact force between elastic rasp bar and fixed rasp bar"

Fig.9

Analysis of tangential contact force betweenelastic rasp bar and fixed rasp bar"

Table 1

Corn parameters in experiment"

参 数数值
平均果穗长度/mm145.6
平均大端直径/mm50.2
平均小端直径/mm45.6
籽粒含水率/%27.6~28.5

Fig.10

Threshing element"

Fig.11

Test scene photos"

Table 2

Results of different cylinder speed"

滚筒转速/(r·min-1)破碎率/%未脱净率/%
3005.572.80
3504.892.40
4003.471.20
4503.410.67
5004.590.58
5506.480.60

Table 3

Variance analysis at different cylinder speed"

试验指标平方和自由度均方F值P值显著性
破碎率12.84652.56921.4820.001*
未脱净率9.68351.937192.3781*

Table 4

Results of different concave clearance"

凹板间隙/mm破碎率/%未脱净率/%
206.121.69
304.781.21
403.181.30
502.371.80
602.182.40

Table 5

Variance analysis at different concave clearance"

试验指标平方和自由度均方F值P值显著性
破碎率22.73845.685244.1826×10-6*
未脱净率1.79640.44920.4510.002*

Table 6

Results of different feed rates"

喂入量破碎率/%未脱净率/%
5.04.370.79
6.53.891.78
8.03.212.08
9.53.983.36
11.05.344.21

Table 7

Variance analysis at different feed rate"

试验指标平方和自由度均方F值P值显著性
破碎率4.88941.22243.5244×10-4*
未脱净率14.53443.633240.3087×10-6*

Table 8

Validation and contrast test of optimal parameter"

试验序号试验指标最优组合常规
1籽粒破碎率/%2.647.19
未脱净率/%0.620.98
2籽粒破碎率/%3.116.92
未脱净率/%0.510.45
3籽粒破碎率/%2.507.98
未脱净率/%0.641.02
4籽粒破碎率/%3.418.12
未脱净率/%0.270.98
平均籽粒破碎率/%2.916.03
未脱净率/%0.510.86

Fig.12

Kernel damaged rate optimal combination verification and contrast test"

Fig.13

Un-threshed rate optimal combination verification and contrast test"

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