Automatic Rice Destoner Machine

Our Automatic Destoner Machine is specially engineered to efficiently remove stones, soil, and other impurities from sesame, beans, quinoa, coffee beans, and similar seed crops. With a stoning efficiency of up to 99.5%, it delivers highly precise separation by utilizing the density difference between grains and stones, combined with adjustable air pressure and vibration frequency.

Equipped with an inverter control system, the machine allows fine adjustments for maximum performance. It offers processing capacities of 10 tons per hour and 5–7 tons per hour, and supports customized voltage options to meet different market requirements. A control box with motor protection ensures enhanced durability and long-term stable operation, making it an ideal solution for grain processing facilities seeking both efficiency and reliability.

Model	SL-10	SL-7.5
Size L×W×H	2550*2000*1600 mm	2000*1560*1855 mm
Weight	950 kg	750 kg
Capacity	10 T/H	5-7T/H
Cleaning rate	≥99.5%	≥99.5%
Voltage	380V(220V/440V need customized) 50/60hz 3 phase	380V(220V/440V need customized) 50/60hz 3 phase
Screen dimension	2000*1800 mm	1500*1800 mm
Power	7.7 kw	6.6 kw

The Automatic Rice Destoner Machine is designed to efficiently separate stones from grains by making use of the density difference between crops and impurities. It is equipped with a high-precision multi-blade fan that adjusts air pressure to suspend lighter grains, while the heavier stones settle onto the stainless-steel mesh surface. By fine-tuning the vibration frequency of the working table, the separation process becomes accurate and reliable.

With its inverter control system, the machine allows precise adjustments, ensuring effective stone removal even when the density difference between grains and stones is minimal. This makes it an ideal solution for rice mills and grain processing plants seeking high efficiency and clean output.

The process begins as wheat is fed through the hopper into the thresher for initial threshing. From there, the material is transferred via the bucket elevator into the pre-cleaner, where oversized and undersized impurities are quickly removed. The cleaned seeds then fall into the air-screen chamber, which effectively removes dust and light impurities. A large air-screen chamber ensures maximum cleaning efficiency.

Next, the material enters the gravity separator, where damaged, immature, insect-infested, or diseased seeds are carefully removed. After gravity separation, the seeds move on to the two-in-one vibrating sifting box, which eliminates both large and small impurities.

For customers requiring more advanced sorting, the system can be equipped with a four-layer sifting box, which not only removes impurities but also classifies seeds into three grades-large, medium, and small-according to size. This flexible configuration ensures higher purity and more precise grading, meeting the needs of different seed processing operations.

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