# A Study of the Distribution of the Threshed Mixture by a Double Longitudinal Axial Flow Corn Threshing Device

^{*}

## Abstract

**:**

## 1. Introduction

## 2. Materials and Methods

#### 2.1. Structure of the Double Longitudinal Axial Flow Threshing Device

#### 2.2. Experimental Material

#### 2.3. Experimental Method

## 3. Results and Discussion

#### 3.1. Effect of Drum Speed on the Mass Distribution of the Threshed Mixture

#### 3.1.1. Effect of Drum Speed on the Kernel Mass Distribution of Maize

#### 3.1.2. Effect of Drum Speed on the Cob Mass Distribution of Maize

#### 3.2. Effect of Concave Clearance on the Mass Distribution of the Threshed Mixture

#### 3.2.1. Effect of Concave Clearance on the Kernel Mass Distribution of Maize

#### 3.2.2. Effect of Concave Clearance on the Cob Mass Distribution of Maize

#### 3.3. Effect of the Feed Rate on the Mass Distribution of the Threshed Mixture

#### 3.3.1. Effect of the Feed Rate on the Kernel Mass Distribution of Maize

#### 3.3.2. Effect of the Feed Rate on the Cob Mass Distribution of Maize

#### 3.4. Discussion

^{2}refers to the correlation coefficient of the regression equation. p < 0.05 means significant, and p < 0.001 means extremely significant.

_{0}+ a

_{1}x

^{1}+ a

_{2}x

^{2}+ a

_{3}x

^{3}+ a

_{4}x

^{4}+ a

_{5}x

^{5}+ a

_{6}x

^{6}+ a

_{7}x

^{7}+ a

_{8}x

^{8}+ a

_{9}x

^{9}. In conclusion, this paper obtained the regularities of distribution of the threshed mixture of the double longitudinal axial flow corn threshing device by a single-factor experiment, which provides a design basis for the structural improvement of the double longitudinal axial flow corn threshing device and the distribution of the fan air volume in the cleaning system so as to reduce the impurity rate and loss rate of the threshers.

## 4. Conclusions

- (1)
- The mass distribution of mixed maize discharge exhibits non-uniform patterns along both the axial and radial directions of the drum. In the axial direction, the mass of maize grains initially increases and then decreases, concentrating primarily in the front 1/3 of the drum, while the mass of maize cob axis continues to increase, particularly after the 1/3 point of the drum, showing a trend that is consistent with the discharge pattern of a single longitudinal axial flow corn threshing device along the axial direction. In the radial direction, maize grains exhibit a “W”-shaped distribution with accumulation in the middle and on both sides, where the middle has the highest mass. Meanwhile, the maize cob axis shows a wave-like distribution, with the highest mass on both sides.
- (2)
- The degree of influence of each experimental factor on the distribution of the discharge mixture along the axial and radial directions varies, with the drum speed having the most significant impact. The experiments indicate that a slower drum speed, a larger threshing clearance, and a smaller feed rate result in a more uniform distribution of the discharged mixture. Combining the grain breakage rate and unthreshed rate, the optimal operational parameter combination for the double longitudinal axial flow threshing device is determined to be a drum speed of 400 r/min, a feed rate of 16 kg/s, and a concave clearance of 50 mm. These findings provide a valuable reference for the structural design optimization of the double longitudinal axial flow threshing device, as well as the cleaning system.

## Author Contributions

## Funding

## Institutional Review Board Statement

## Data Availability Statement

## Conflicts of Interest

## References

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**Figure 2.**Structure diagram of the distribution of the material box along the axial (

**a**) and radial (

**b**) directions.

**Figure 5.**Three-dimensional distribution of the weight. (

**a**) Mass distribution pattern of the corn kernels. (

**b**) Mass distribution pattern of the corn cobs.

**Figure 6.**Mass distribution of the threshed mixture for different drum speeds. Mass distribution curves in the axial and radial directions of (

**a**,

**b**) corn kernels; (

**c**,

**d**) corn cobs.

**Figure 7.**Mass distribution of the threshed mixture for different concave clearances. Mass distribution curves in the axial and radial direction of (

**a**,

**b**) corn kernels; (

**c**,

**d**) corn cobs.

**Figure 8.**Mass distribution of the threshed mixture for different feed rates. Mass distribution curves in the axial and radial direction of (

**a**,

**b**) corn kernels; (

**c**,

**d**) corn cobs.

**Figure 9.**The fitting curves of the axial distribution of the threshed mixture along the drum. (

**a**) Regression equation of the axial distribution of corn kernels along the drum. (

**b**) Regression equation of the radial distribution of corn kernels along the drum. (

**c**) Regression equation of the axial distribution of corn cobs along the drum. (

**d**) Regression equation of the radial distribution of corn cobs along the drum.

Structural Parameter | Value |
---|---|

Threshing drum length/mm | 3330 |

Threshing drum diameter/mm | 550 |

Concave clearance/mm | 30–70 |

Concave plate covering corner/(°) | 153 |

Threshing element | nail tooth |

Flow guide plate angle/(°) | 30 |

Numbers | Factors | Values | Condition |
---|---|---|---|

1–5 | Drum speed (r/min) | 300, 350, 400, 450, 500 | Concave clearance = 50 mm Feed rate = 16 kg/s |

6–10 | Concave clearance (mm) | 40, 45, 50, 55, 60 | Drum speed = 400 r/min Feed rate = 16 kg/s |

11–15 | Feed rate (kg/s) | 14, 15, 16, 17, 18 | Drum speed = 400 r/min Concave clearance = 50 mm |

Drum Direction | Name | Regression Equation | R^{2} | p |
---|---|---|---|---|

axial | corn kernels | ${\mathrm{y}}_{1}=\frac{2360.015+209.089x}{1-0.322x+0.38{x}^{2}}$ | 0.97 | <0.001 |

radial | corn kernels | ${y}_{2}=4871.563-5766.879{x}_{1}+4480.413{x}_{2}-1810.679{x}_{3}\phantom{\rule{0ex}{0ex}}+358.640{x}_{4}-22.760{x}_{5}-2.856{x}_{6}+0.569{x}_{7}\phantom{\rule{0ex}{0ex}}-0.034{x}_{8}$ | 0.99 | <0.05 |

axial | corn cobs | ${y}_{3}=340.967-\frac{330.146}{1+{\left(\frac{x}{17.285}\right)}^{5.632}}$ | 0.99 | <0.001 |

radial | corn cobs | ${y}_{4}=-320.402+1166.137{x}_{1}-711.969{x}_{2}+218.923{x}_{3}\phantom{\rule{0ex}{0ex}}-42.860{x}_{4}+6.162{x}_{5}-0.660{x}_{6}+0.047{x}_{7}\phantom{\rule{0ex}{0ex}}-0.001{x}_{8}$ | 0.94 | <0.05 |

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**MDPI and ACS Style**

Yue, D.; Wang, Q.; He, Q.; Li, D.; Yu, Q.; Geng, D.; Li, M.
A Study of the Distribution of the Threshed Mixture by a Double Longitudinal Axial Flow Corn Threshing Device. *Agriculture* **2024**, *14*, 166.
https://doi.org/10.3390/agriculture14020166

**AMA Style**

Yue D, Wang Q, He Q, Li D, Yu Q, Geng D, Li M.
A Study of the Distribution of the Threshed Mixture by a Double Longitudinal Axial Flow Corn Threshing Device. *Agriculture*. 2024; 14(2):166.
https://doi.org/10.3390/agriculture14020166

**Chicago/Turabian Style**

Yue, Dong, Qihuan Wang, Qinghao He, Duanxin Li, Qiming Yu, Duanyang Geng, and Mingrui Li.
2024. "A Study of the Distribution of the Threshed Mixture by a Double Longitudinal Axial Flow Corn Threshing Device" *Agriculture* 14, no. 2: 166.
https://doi.org/10.3390/agriculture14020166