Application of Drum Sieve Pre-Cleaner with Circulating Air Aspiration in Pre-Drying Rice Processing
The drum sieve pre‑cleaner (also called a cylinder pre‑cleaner) is a rotary double‑layer screen that removes coarse impurities (stalks, stones, large debris) through the inner drum and fine impurities (sand, broken grains) through the outer drum, based on particle size. However, it cannot effectively separate light contaminants such as husks, chaff, and dust that are similar in size to the grain. This is where the circulating air aspiration system comes in: it applies an airflow stream to the falling grain, lifting and carrying away lightweight materials, while the air is recirculated in a closed loop to reduce dust emissions and energy use.
Freshly harvested paddy rice contains a wide range of impurities—straw, stones, dust, husks, empty grains, and soil clods—which can clog dryers, create fire hazards, reduce drying efficiency, and compromise grain quality. Effective pre‑cleaning is therefore essential before drying.
The drum sieve pre‑cleaner (also called a cylinder pre‑cleaner) is a rotary double‑layer screen that removes coarse impurities (stalks, stones, large debris) through the inner drum and fine impurities (sand, broken grains) through the outer drum, based on particle size. However, it cannot effectively separate light contaminants such as husks, chaff, and dust that are similar in size to the grain. This is where the circulating air aspiration system comes in: it applies an airflow stream to the falling grain, lifting and carrying away lightweight materials, while the air is recirculated in a closed loop to reduce dust emissions and energy use.
Together, these two stages form a powerful combined cleaning system. The drum sieve handles size‑based separation, while the air aspiration targets specific‑weight differences. The result is comprehensive impurity removal that protects downstream drying equipment, improves airflow uniformity, speeds up drying, lowers energy consumption, reduces fire risks, and enhances final grain quality.
This integrated solution is widely used in large rice mills and storage depots, typically positioned at the intake before the dryer. Industry practice confirms that this approach effectively solves the challenges of high impurity and moisture content during peak harvest periods.
In short, pairing a drum sieve pre‑cleaner with a circulating air aspirator is a proven, efficient, and cost‑effective strategy for preparing rice for drying—delivering tangible benefits in safety, quality, and operational economy.
