1、 Working principle: Collaborative design of optics and fluid mechanics

The seed cleanliness workbench achieves impurity separation through a transparent inclined working surface and a controllable airflow system. Its core principle includes three mechanisms:

Gravity stratification: Seeds and impurities naturally stratify on a tilted table (usually tilted at an angle of 5 ° -15 °) due to density differences, with heavy impurities (such as stones) sinking and light impurities (such as chaff) floating up;

Airflow assistance: The bottom fan generates a vertical upward airflow (wind speed of 0.5-2m/s) to blow light impurities away from the seed layer while avoiding blowing the seeds;

Optical enhancement: The built-in LED ring light source provides uniform and shadowless illumination, combined with a transparent acrylic tabletop, making the color and shape differences between impurities and seeds more prominent, making it easier for manual or image recognition systems to distinguish.

2、 Structural composition and functional modules

Main frame: made of stainless steel or aluminum alloy material to ensure corrosion resistance and stability;

Tilting worktable: The surface is sandblasted to reduce reflection, and the edges are equipped with baffles to prevent seeds from slipping off;

Airflow control system: The variable frequency fan is paired with a wind speed regulating valve to accurately control the airflow intensity;

Lighting module: Cold light source LED strip (color temperature 5000-6500K) to avoid heat affecting seed activity;

Dust collection device: detachable dust collection box equipped with HEPA filter to prevent secondary pollution.

3、 Practical Steps and Key Techniques

Sample pretreatment: Mix the seed sample evenly and take a representative sub sample (usually 100-500g);

Parameter settings: Adjust the tilt angle (such as 5 ° for wheat and 10 ° for cotton) and wind speed (0.8m/s for chaff and 1.5m/s for broken leaves) according to the seed type;

Layered operation: Slowly pour the sample onto the workbench and use a soft bristled brush to assist in separating light impurities;

Multiple screening: Repeat the initial separation of seeds 2-3 times to ensure a purity of ≥ 98%;

Data recording: Use an electronic balance to weigh impurities and clean seeds, and calculate the percentage of cleanliness.

4、 Application scenarios and selection suggestions

Laboratory testing: Choose an intelligent workbench with image analysis function, which can automatically identify impurities and generate reports;

Seed processing line: using high flow (>500kg/h) industrial grade equipment, combined with vibrating feeders to achieve continuous operation;

Field inspection: Portable workbench (foldable design, weight<10kg) meets outdoor usage needs.