Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (1): 351-360.doi: 10.13229/j.cnki.jdxbgxb20190826

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Effect of motion parameters of cleaning screen on corn cob blocking law

Chao CHENG1,2(),Jun FU1,2(),Fu-ping HAO3,Zhi CHEN2,3,De-yi ZHOU2,Lu-quan REN1,2   

  1. 1. Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China
    2. College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China
    3. Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China
  • Received:2019-08-20 Online:2020-01-01 Published:2020-02-06
  • Contact: Jun FU E-mail:chengchao17@mails.jlu.edu.cn;fu_jun@jlu.edu.cn

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Abstract:

Screen blocking during cleaning operation of combine by corn cob seriously affects the yield of corn grain. Amplitude, vibration frequency and vibration angle of the screen are three key motion parameters. In order to explore the influence of three key motion parameters on screen blocking, single-factor test, orthogonal test and verification test were carried out by self-made vibration test bench and modified combine prototype respectively. The change rules of acceleration and mass of blocked corn cob with the increase of motion parameters were revealed through single factor test. The regression model of the influence of three motion parameters on screen blocking was established through orthogonal test. Then the optimal combination of three motion parameters was amplitude of 50 mm, vibration frequency of 7 Hz, direction angle of 55°. The validation test showed that the average mass of blocked corn cob was 10.39 g, the grain impurity rate was 0.9%, and the cleaning loss rate was 1.09%. The optimal combination of motion parameters has good screening performance and meets the production requirements of grain cleaning in combine.

Key words: agricultural mechanization engineering, corn combine, screen motion parameters, corn cob, screen blocking law

CLC Number: 

  • S225.5

Fig.1

Schematic diagram of collision motion between cleaning screen and corn cob"

Fig.2

"

Fig.3

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Fig.4

Structural characteristics of corn cob"

Fig.5

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Fig.6

Collect blocking corn cobs"

Fig.7

Effect of amplitude on cleaning screen blocking law caused by corn cob"

Fig.8

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Fig.9

Effect of vibration frequency on cleaning screen blocking law caused by corn cob"

Fig.10

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Fig.11

Effect of direction angle on cleaning screen blocking law caused by corn cob"

Fig.12

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Table 1

Coding of test factors"

编码 因素
振幅x 1/mm 振频x 2/Hz 方向角x 3/（°）
r 50.0 8.0 60.0
1 48.5 7.7 57.1
0 45.0 7.0 50.0
-1 41.5 6.3 42.9
-r 40.0 6.0 40.0

Table 2

Orthogonal test scheme and results"

试验编号 试验因素 堵塞玉米芯轴质量y/g
x 1 x 2 x 3
1 1 1 1 9.40
2 1 1 -1 11.60
3 1 -1 1 6.68
4 1 -1 -1 11.48
5 -1 1 1 8.91
6 -1 1 -1 11.84
7 -1 -1 1 13.19
8 -1 -1 -1 14.29
9 r 0 0 6.31
10 -r 0 0 11.23
11 0 r 0 7.94
12 0 -r 0 13.31
13 0 0 r 8.67
14 0 0 -r 13.19
15 0 0 0 6.97
16 0 0 0 8.79
17 0 0 0 7.45
18 0 0 0 7.57

Fig.13

"

Fig.14

Verification test prototype"

Table 3

Verification test results"

序号 堵塞玉米芯轴质量/g 籽粒含杂率/% 清选损失率%
1 10.36 0.89 1.09
2 10.25 0.88 1.11
3 10.41 0.91 1.08
4 10.51 0.93 1.06
5 10.43 0.90 1.10
平均值 10.39 0.90 1.09

Fig.15

Changing curve of mass of blocked corn cob with time"

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