The influence of a seed drop tube of the inside-filling air-blowing precision seed-metering device on seeding quality

Tang, Han; Xu, Fudong; Xu, Changsu; Zhao, Jiale; Wang, Yijia

doi:10.1016/j.compag.2022.107555

Cited by 34 publications

(14 citation statements)

References 22 publications

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“…Based on the working requirements of the leaf gas suction head, appropriate solution parameters were set. The control equation was discretized using the finite volume method, and a standard turbulence model [22,23] was selected with the pressure-based SIMPLE separation algorithm used for solving.…”

Section: Single-factor Simulation Testmentioning

confidence: 99%

Design and Experimental Study of Flexible Adsorption and Localization Mechanism for Vegetable Grafting Machines

Li,

Wang,

et al. 2023

Preprint

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Because of the lack of good seedling positioning during vegetable grafting, there are issues such as high labor costs and long grafting time. This article proposes a negative pressure suction seedling positioning method for seed leaves based on the characteristic parameters of cucumber spike wood, and designs a flexible adsorption positioning mechanism for spike wood. Firstly, the ventral surface curve trajectories of cucumber cotyledons were extracted using Matlab software, and then a shape-adaptive design was applied to the attachment surface of the flexible suction positioning mechanism, and a computational fluid dynamics model of the airflow field was established. By combining Fluent simulation analysis with orthogonal experiments, the effect of suction hole diameter, vacuum negative pressure value, suction hole quantity, and suction hole depth on the adsorption effect of the suction head was analyzed, the main and secondary factors and operational indicators that affect the adsorption effect are evaluated. The optimal parameter combination: suction hole diameter of 1.5mm, vacuum negative pressure value of 2kPa, suction hole quantity of 42, and suction hole depth of 2mm, has been found. A verification experiment was conducted on a test bench, and the experimental results show that the success rate of leaf absorption using the optimal parameter combination is 98.33%, which indicates that the suction head is designed reasonably and meets the requirements of grafting.

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Section: Single-factor Simulation Testmentioning

confidence: 99%

Design and Experimental Study of Flexible Adsorption and Localization Mechanism for Vegetable Grafting Machines

Li,

Wang,

et al. 2023

Preprint

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“…Gao Xiaojun et al [14] designed a high-speed seed metering unit device using centrifugal force for seeding, cleaning, and air movement, achieving efficient and stable single-grain seeding. Tang Han et al [15] designed an internally charged air-assisted precise seed metering unit device, achieving accurate seeding. In most of these studies, optimized cleaning mechanisms and multiple cleanings were used to improve the cleaning effect of the seed meter.…”

Section: Introductionmentioning

confidence: 99%

Research on the Flexible Gradual Seed-Cleaning Method of the Brush-Type Single-Seed Soybean Planter

Li,

Zhao,

Yang

et al. 2024

Agriculture

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In response to the poor cleaning effect of the brush-type soybean seeder, a lightweight mechanism of the brush-type soybean seeder was optimized and designed. We proposed a progressive seed-cleaning method. Firstly, mechanical analysis was conducted on the soybean seeding process to prevent excessive clearing of individual soybean seeds initially filled into the orifices by the seeding brush. A formula for expressing the force exerted by the seeding brush on stabilizing individual soybean seeds in the orifice was derived. Secondly, an analysis of the progressive seeding principle was performed, and theoretical calculations were carried out for the progressive seeding curves within the x-y plane and along the direction of the z-axis. The progressive seeding curves were determined. Factors affecting the seeding efficiency were analyzed, including the plate’s speed, the initial angle of the seeding brush, and the initial distance between the seeding brush and the seeding plate. Based on the Box–Behnken central composite design theory, using the seeding tray’s rotational speed, the initial angle of the seeding brush, and the initial distance between the seeding brush and the seeding tray as experimental factors, orthogonal experiments were conducted with the leakage rate and the over-cleaning rate as the indicators for the evaluation, and the working parameters were optimized. Validation experiments showed that with a plate speed of 29 rpm, an initial angle of the seeding brush of 54°, and an initial distance between the seeding brush and the seeding plate of 11 mm, the results were as follows: a skip-seeding rate of 1.23% and an over-seeding rate of 0.66%, indicating a significant improvement in seeding performance. A comparative experiment was conducted with non-progressive cleaning brushes, and the test results showed that the progressive cleaning brush reduced the leakage rate by more than 1% and the over-cleaning rate by more than 0.5%.

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“…The working process of the inside-filling, air-blowing, seed-metering device was simulated based on CFD and the discrete element method (DEM) to optimize the structure of the seed-metering device [25]. The movement of maize seed in the airflow-assisted seed-dropping device was simulated by CDF and DEM to investigate the influence of the structural parameters of the seed drop tube on the seeding accuracy [26]. A numerical simulation based on CFD-DEM of a vegetable seed meter was carried out to analyze the changes in the flow field and seed movement law, and bench tests were carried out to determine the optimum operating parameters of the seed meter [27].…”

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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The influence of a seed drop tube of the inside-filling air-blowing precision seed-metering device on seeding quality

Cited by 34 publications

References 22 publications

Design and Experimental Study of Flexible Adsorption and Localization Mechanism for Vegetable Grafting Machines

Design and Experimental Study of Flexible Adsorption and Localization Mechanism for Vegetable Grafting Machines

Research on the Flexible Gradual Seed-Cleaning Method of the Brush-Type Single-Seed Soybean Planter

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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