A rice huller is a grain processing machine used to remove the husk of paddy rice and produce brown rice. Its purpose is to strip the outer husk while minimizing grain breakage and surface damage to maintain as much kernel integrity as possible.
The rubber roller assembly is the core transmission mechanism of a rice huller and plays a decisive role in the dehusking process. The working principle is that two rubber rollers rotate in opposite directions at different speeds, creating squeezing and tearing forces as the grain passes between them, effectively removing the husk.
Rice hullers typically adopt a dual-speed roller drive system, where one motor drives both the fixed and moving rollers at different speeds. This ensures a stable dehusking rate while reducing operator workload.
The rubber roller and related mechanical components have high rotational inertia. Therefore, rapid energy dissipation must be considered during fast stop or emergency stop conditions. A common DC bus configuration is highly suitable for this scenario. The technological process of a rice huller generally includes feeding and flow control, dehusking, separation of mixture materials, husk extraction by airflow, and final discharge.
Among these steps, dehusking is the most critical stage—when paddy rice enters the nip between the fast and slow rollers, the linear speed difference generates strong tearing force. Under the combined effect of this force and roller pressure (applied by pneumatic or spring mechanisms), the husk is torn and removed, outputting a mixture of brown rice, partially hulled grains, broken husks, and a small amount of bran.
GTAKE’s control solution for rice huller rubber rollers is composed of two GK620 frequency inverters sharing a common DC bus, motors, an HMI, and PROFINET industrial communication. The control system topology is shown on the left.
GK620 is a general-purpose AC drive with V/Hz and sensor-less vector control. It’s powerful in performance, reliable in quality and optimized in structure. GK620 is widely used in various applications including air compressor, crane & lift, metal processing, mining, mills, food and beverage processing, packaging, conveyor, textile, plastics, fan & pump, etc.
