DRY STONE SEPARATOR WITH AIR RECIRCULATION SYSTEM

Closed-circuit air-recycling stone separation system

An eco-friendly, highly energy-saving, next-generation engineering solution for removing stones, glass, metal and high-density foreign matter on grain and pulse processing lines. This refined system works with near-zero waste ejection and maximum stone-separation precision on all granular products — wheat, barley, maize, chickpea, bean, anise, thyme, sesame, rice and hazelnut.

WORKING PRINCIPLE

Built-in fan and cyclone — closed-circuit air circulation: owing to a dedicated fan and high-efficiency cyclone mounted on the machine, the air used for separation is continuously recycled; light particles (dust and straw) are carried by the air stream into the cyclone, separated from the air there and discharged. Clean-air return and fluidising — fluidised bed on regenerated air: the air cleaned in the cyclone is fed back into the stoner without loss via a dedicated return channel; this regenerated stream lightens the product’s specific gravity on the special woven steel mesh and forms a flawless fluidised-bed curtain on the screen. Vibratory, density-based separation — bidirectional flow and discharge: in the body driven by twin vibro-motors, the lightened kernels flow down under gravity and the screen’s incline, while dense stones settle onto the screen surface; the special weave geometry of the steel wire delivers upward mechanical impacts to the stones, making them climb against the product flow and be ejected from the system.

KEY ADVANTAGES

• 100% eco-friendly and energy-thrifty: Because the air is not exhausted outside but circulated internally in a closed circuit, the load on the plant’s central aspiration and filter system drops to zero — delivering major energy savings and a clean working environment.

• Versatile industrial solution: Across a broad product range (grains, pulses, oilseeds, nuts) it removes even the toughest stones without losses, detecting precise density differences.

• Transparent process management (plexiglass): High-strength transparent inspection windows let the operator watch the product motion on the screen and the fluidising balance live, easily setting the air flow and vibration level.

• Flexible capacity and model options: Different industrial types and capacity options are available to suit plants’ capacity needs and factory design.

ENGINEERING NOTE

Whereas traditional stoners continuously draw warm, clean air from the plant and exhaust it outside, the air-recycling dry stoner keeps the air within itself. This closed-circuit ecosystem not only improves flour quality but also permanently lowers the plant’s overall HVAC, heating and ventilation costs.