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Purpose <p>To achieve precise wheat seeding by improving seed delivery stability and uniformity through the design of a novel airflow-assisted device.</p> Methods <p>A precision wheat seeder with an annular gap airflow-assisted seed delivery device was developed. A CFD-DEM coupled numerical model was established based on the characteristic dimensions of wheat seeds, using a Box-Behnken experimental design. The effects of annular gap outlet width, gap length, and tube orifice distance on seed transportation performance were analyzed. High-speed camera experiments were conducted to observe seed posture, and bench tests were performed to evaluate seed delivery performance.</p> Results <p>The average time interval between two adjacent seeds leaving the guide tube was 0.031 ± 0.005&#xa0;s. Optimal performance was achieved when the outlet width was 1.7&#xa0;mm, the gap length was 33.3&#xa0;mm, and the outlet distance was 7.2&#xa0;mm, resulting in a coefficient of variation of 21.07% for seed intervals. Bench tests showed that at a seed injection pressure of 4000&#xa0;Pa and frequency of 35&#xa0;Hz, the coefficients of variation for seed position and velocity were 12.56% and 5.44%, respectively, representing significant improvements compared to conventional seed tubes.</p> Conclusion <p>The proposed annular gap airflow-assisted seed delivery device improves seed spacing uniformity and delivery stability, providing a promising approach for achieving high-precision wheat seeding.</p>

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Design and Research of Annular-Gap Airflow Auxiliary Seeds Delivery Device for Wheat Precision Metering Device

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Jitong Xu,
  • Shuaihua Hao,
  • Xuan Jia,
  • Chengtian Zhu,
  • Yalong Li,
  • Songbao Guo,
  • Juxin Huo,
  • Cailing Liu

摘要

Purpose

To achieve precise wheat seeding by improving seed delivery stability and uniformity through the design of a novel airflow-assisted device.

Methods

A precision wheat seeder with an annular gap airflow-assisted seed delivery device was developed. A CFD-DEM coupled numerical model was established based on the characteristic dimensions of wheat seeds, using a Box-Behnken experimental design. The effects of annular gap outlet width, gap length, and tube orifice distance on seed transportation performance were analyzed. High-speed camera experiments were conducted to observe seed posture, and bench tests were performed to evaluate seed delivery performance.

Results

The average time interval between two adjacent seeds leaving the guide tube was 0.031 ± 0.005 s. Optimal performance was achieved when the outlet width was 1.7 mm, the gap length was 33.3 mm, and the outlet distance was 7.2 mm, resulting in a coefficient of variation of 21.07% for seed intervals. Bench tests showed that at a seed injection pressure of 4000 Pa and frequency of 35 Hz, the coefficients of variation for seed position and velocity were 12.56% and 5.44%, respectively, representing significant improvements compared to conventional seed tubes.

Conclusion

The proposed annular gap airflow-assisted seed delivery device improves seed spacing uniformity and delivery stability, providing a promising approach for achieving high-precision wheat seeding.