Briefly describe the air screen cleaner and destoner.

Both air-screen cleaners and destoners are key pieces of equipment in grain processing, their core function being to remove impurities and improve material purity.

The function of an air-screen cleaner: Utilizing a combination of airflow and a screen, it separates light impurities (such as dust, straw, and leaf debris) from grains into larger impurities (such as stones, clods of earth, and weed roots).

It grades the grains by size, selecting uniform particles that meet requirements and removing excessively large or small materials.

This preliminary purification of the material lays the foundation for subsequent processing (such as milling and destoner) and reduces equipment wear.

The function of a destoner: Specifically designed to separate heavy impurities such as stones and metal pieces that are similar in size to grain particles but have different specific gravities, based on their density.

It prevents stones from entering subsequent processing stages, preventing equipment damage (such as wear on grinding rollers and screen breakage).

It ensures the safety and quality of the finished grain, avoiding potential safety hazards during consumption or processing.

Applications of Air Screen Cleaners:

**Post-harvest Grain Processing:** Processes raw grains such as wheat, rice, and corn, removing mixed impurities such as straw, broken leaves, dust, and clods of soil mixed in during harvest.

**Seed Processing:** Screens qualified seeds, removing shriveled, broken, and impurity grains to ensure seed purity and uniformity.

**Feed Processing:** Processes soybean meal, wheat bran, and grain raw materials, removing light impurities and missized particles to improve feed quality.

**Food Processing Pretreatment:** Preliminary purification before processing grains and oilseeds (peanuts, rapeseed) to reduce the burden on subsequent processing.

Applications of Destoners:

**Before Grain Refining:** Removes heavy impurities such as stones and metal shavings similar in size to grain grains before wheat milling, rice whitening, and corn deep processing.

**Seed Selection:** Removes heavier impurities from seeds to prevent damage to agricultural machinery during sowing or affecting germination rates.

Oilseed Processing: Before pressing peanuts, sesame seeds, rapeseed, etc., stones are removed to prevent wear and tear on oil press parts and to avoid stone chips being mixed into the oil residue.

Grain Purification: In the processing of finished grains such as millet, red beans, and mung beans, hidden heavy impurities are removed to ensure food safety.