Design and test of a pneumatic type of high-speed maize precision seed metering device

Tang, Han; Xu, Fudong; Guan, Tianyuan; Xu, Changsu; Wang, Jinwu

doi:10.1016/j.compag.2023.107997

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…where ρ a is the air density, kg/m 3 ; v a is the airflow velocity, m/s; and C is the coefficient of fluid resistance of peanut pods [8,15,16].…”

Section: Analysis Of the Process Of Fruit-soil Separatingmentioning

confidence: 99%

Design and Parameter Optimization of a Negative-Pressure Peanut Fruit-Soil Separating Device

Qin,

Jin,

Cao

et al. 2023

Agronomy

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This study proposes a negative-pressure fruit-soil separating device for peanuts cultivated in hilly and mountainous areas after combined harvesting, and the mechanism of the movement of the material in the process of material screening, fruit-soil separating, and pneumatic conveying of the device was analyzed. In addition, a four-factor, three-level Box-Behnken regression design test was used to explore the optimum operating parameters of the peanut fruit-soil separation device. The results showed that the best fruit-soil separation effect was achieved when the wind speed of the blower was 13.58 m/s, the height of the suction nozzle from the screen surface was 27 mm, the length of the suction port was 64 mm, and the feeding rate was 600 kg/h. Validation tests demonstrated that the impurity rate of 0.16% and the peanut pod loss rate of 0.2% exceeded the industry standard, indicating superior performance.

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“…where ρ a is the air density, kg/m 3 ; v a is the airflow velocity, m/s; and C is the coefficient of fluid resistance of peanut pods [8,15,16].…”

Section: Analysis Of the Process Of Fruit-soil Separatingmentioning

confidence: 99%

Design and Parameter Optimization of a Negative-Pressure Peanut Fruit-Soil Separating Device

Qin,

Jin,

Cao

et al. 2023

Agronomy

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“…To address the problem of poor quality high-speed operation of the air-suction seedmetering device, domestic scholars have carried out in-depth research. Tang Han et al [6] designed a pneumatic type of high-speed maize precision seed-metering device through a theoretical analysis and bench test, and it is verified that the designed seed catheter can effectively reduce the coefficient of variation. Gao Xiaojun et al [7,8] designed an air-suction seed dispenser with a new working principle, through theoretical analysis and design, to meet the requirements of high-speed and accurate sowing.…”

Section: Introductionmentioning

confidence: 99%

Design and Experiment of Air-Suction Maize Seed-Metering Device with Auxiliary Guide

Ding,

Yuan,

Dou

et al. 2024

Agriculture

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Due to the irrational design of the seed discharge plate and the vacuum chamber, the high-speed seed filling effect of the air-suction maize precision seed-metering device is poor. Therefore, an air-suction maize seed-metering device with an auxiliary guide is designed to realize high-speed precision seed discharging. An auxiliary guide filling theory is put forward, and the design of the seed plate type hole charging structure is formulated. Fluent 2022 software is used to analyze nine kinds of vacuum chamber structures; the optimal vacuum chamber structure parameters were determined by polar analysis. In order to investigate the changes of negative pressure and flow speed under the dynamic flow field, a slip grid was used to analyze the dynamic flow field with three different operating speeds and negative pressures. It found that the size of negative pressure did not affect the flow field distribution, and the pressure and flow speed gradually decreased as the distance from the inlet was farther away; meanwhile, the negative pressure distribution and air speed distribution were almost unchanged when the holes at different rotational speeds were at the same position. Finally, bench tests were carried out, and three indexes, namely, the qualified index, the multiple index and the missing index, were selected, with operating speed and negative pressure as factors, two-factor five-level orthogonal test was carried out, and the optimal parameter combinations at 6.0, 7.5, 9.0, 10.5, and 12 km/h forward velocity were derived and verified by regression equations. The results showed that the designed seed-metering device was repeated five times when the pressure of the vacuum chamber was −3.5 kPa and the rotational speed of the seed-metering device was 23 r/min, the average grain spacing qualified index was 95.8%, the missing index was 1.6%, the multiple index was 2.6%, and the indexes met the requirements of precision sowing. It is of great significance for our country’s seeder to develop in the direction of high-speed and precision.

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“…For high-density planting of maize, cotton, and sunflower, an intermittent seed meter with a left seed disc and a right seed disc was invented [18]. To increase the working speed in the precision planting of maize, the method of positive pressure air flow and inclined seed disc is used to improve the seed falling speed of the seed meter, and the research proved that the high-speed positive pressure air flow can improve the uniformity of the seed spacing [19]. Seed and meter structure are the main factors affecting sowing accuracy, and some scientists have carried out related research.…”

Section: Introductionmentioning

confidence: 99%

Influence of Shaped Hole and Seed Disturbance on the Precision of Bunch Planting with the Double-Hole Rice Vacuum Seed Meter

Qian,

He,

Qin

et al. 2024

Agronomy

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The double-hole rice vacuum seed meter is critical equipment for the planting precision of rice direct seeding. The effects of shaped holes and seed disturbance on the precision of rice bunch planting were investigated to improve the precision of bunch planting with the double-hole rice vacuum seed meter. A test bench with the rice vacuum seed meter was set up to analyze the trends in the quality of feed index, miss index, and multiple index of seed meters with different shaped holes at different speeds and vacuum pressures. Based on the optimal hole structure, different seed disturbance structures were designed to investigate the influence of the seed disturbance structure on the precision of bunch planting. A multiple linear regression model was established for the relationship between the disturbance structure, vacuum pressure, rotational speed, and the precision of bunch planting. Discrete element numerical simulation experiments were carried out to analyze the effect of disturbance structures on seeds. The planting precision of the seed meter with the shaped hole was significantly higher than that of the seed meter without the shaped hole while the shaped hole B was the optimum structure. Disturbance structure affects the quality of feed index, multiple index rate, and miss index. The planting precision of the seed disturbance structure II was better than the other structures. At a speed of 60 rpm and vacuum pressures of 2.0 kPa, 2.4 kPa, and 2.8 kPa, the qualities of feed index of seed disturbance structure II were 90%, 91.11%, and 89.17%, respectively, and the miss indexes were 2.96%, 1.94%, and 1.57%, respectively. At high rotational speeds, the precision of rice bunch planting with the seed disturbance structure is better than that without the seed disturbance structure. In the simulation test, the seed velocity and total force magnitude of the meter without disturbance structures were less than those with the disturbed structure. Simulation experiments showed that the seed disturbance structure breaks up the stacked state of seeds. Research has shown that the shaped hole holds the seed in a stable suction posture, which helps to increase the seed-filling rate. Seed disturbance improves seed mobility, thereby enhancing the precision of bunch planting.

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Design and test of a pneumatic type of high-speed maize precision seed metering device

Cited by 19 publications

References 15 publications

Design and Parameter Optimization of a Negative-Pressure Peanut Fruit-Soil Separating Device

Design and Parameter Optimization of a Negative-Pressure Peanut Fruit-Soil Separating Device

Design and Experiment of Air-Suction Maize Seed-Metering Device with Auxiliary Guide

Influence of Shaped Hole and Seed Disturbance on the Precision of Bunch Planting with the Double-Hole Rice Vacuum Seed Meter

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