Grain cleaning equipment is used to remove impurities from grains and to perform fine selection and grading. It is mainly used in the grain handling stages before and after processing. It separates impurities based on differences in physical properties such as particle size, specific gravity, shape, and airflow characteristics. Common types include reciprocating vibrating screens, cylindrical screens (separating by size), gravity destoners (separating by specific gravity), spiral separators and drum separators (separating by shape), large-scale high-efficiency vibrating screens, large-scale high-efficiency gravity grading and destoners, and circulating air gravity grading and destoners. Some equipment combines airflow suspension (such as mobile air-separated grain cleaners) or magnetic adsorption to improve efficiency. Combined equipment (such as a combination of a primary screening box and an air-separated box) integrates multiple screening functions, optimizing the process and reducing energy consumption, suitable for small and medium-sized processing plants.
Related equipment uses a multi-layer screen structure, driven by a vibrating motor and supporting adjustment of excitation force, vibration direction, and screen tilt angle. It can separate impurities such as stones, sand, and lint from grains such as wheat, corn, and beans. Production enterprises integrate cleaning, grading, and fine selection modules, along with dust removal and conveying systems.