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Rice Grain U-Shaped Screw Conveyor is a continuous conveyor system used in grain processing, storage, and transshipment. It is primarily designed for horizontal and low-angle conveying of various rice materials, including paddy rice, brown rice, and polished rice. It is a core component of grain and oil processing production lines. The machine features a U-shaped open trough with a screw conveyor structure, which, unlike conventional tubular conveyors, is more suitable for conveying granular and easily scattered materials like rice. It can achieve an inclination angle of up to 45° and a horizontal length of up to 30 meters. It is available in 304 and 316 stainless steel and can be customized to meet specific customer requirements.
The Rice Grain U-Shaped Screw Conveyor boasts a compact and streamlined structure. The main body is a U-shaped trough made of food-grade stainless steel, with a smooth, burr-free surface to prevent scratching the rice and leaving material residue. The core conveying components are the screw shaft and screw blades. The supporting power system includes a geared motor and coupling, providing stable power with speeds adapted to grain conveying needs. Other components include an inlet, outlet, sealing cover, support frame, and bearing seats. The sealing cover prevents dust leakage, the support frame stabilizes the machine body, and the bearing seats are wear-resistant and durable. The entire system is easy to disassemble and clean.
Compared to traditional belt conveyors and bucket elevators, the Rice Grain U-Shaped Screw Conveyor offers irreplaceable core advantages for rice conveying. It achieves low-breakage conveying throughout the process. The specially designed arc-shaped screw blades, combined with a gentle pushing mode, significantly reduce rice grain breakage and hulling rates, ensuring the quality and yield of the finished rice. The U-shaped trough offers moderate sealing, effectively reducing dust leakage and impurity contamination during rice conveying, while preventing material accumulation in dead corners. Furthermore, the machine boasts stable and adjustable conveying efficiency, matching the rhythm of the entire rice milling production line. It supports multi-point feeding and discharging, is moisture-resistant, wear-resistant, and corrosion-resistant, making it suitable for the typical operating conditions of grain processing plants.
The Rice Grain U-Shaped Screw Conveyor operates based on helical propulsion mechanics. Its core relies on a motor driving a reducer to rotate the helical shaft. The helical blades rotate synchronously, applying axial thrust to the rice material within the trough. The friction generated by the rice material's own weight and the U-shaped trough walls prevents the material from moving in a circular motion with the blades, forcing it to move in a uniform linear motion along the bottom of the U-shaped trough, achieving directional conveying from the inlet to the outlet.
| Specification | Main technical performance | drive unit | drive unit | Weight (kg) | |||
| diameter | length (m) | Output (cement) t/h | speed(min) | reducer | electric motor | ||
| model | speed ratio | Power(kw) | |||||
| U 200 | -10 | 9 | 60 | ZQ250 | 23.34 | 1.1 | 726 |
| U 200 | -20 | 9 | 60 | ZQ250 | 23.34 | 1.5 | 1258 |
| U 250 | -10 | 15.6 | 60 | ZQ250 | 23.34 | 2.2 | 960 |
| U 250 | -20 | 15.6 | 60 | ZQ250 | 23.34 | 3 | 1750 |
| U 300 | -10 | 21.2 | 60 | ZQ350 | 23.34 | 3 | 1373 |
| U 300 | -20 | 21.2 | 60 | ZQ350 | 23.34 | 4 | 2346 |
| U 400 | -10 | 51 | 60 | ZQ400 | 23.34 | 5.5 | 1911 |
| U 400 | -20 | 51 | 60 | ZQ500 | 23.34 | 11 | 2049 |
| U 500 | -10 | 87.5 | 60 | ZQ400 | 23.34 | 7.5 | 2381 |
| U 500 | -20 | 87.5 | 60 | ZQ650 | 23.34 | 18.5 | 5389 |
| U 600 | -10 | 134.2 | 45 | ZQ750 | 23.34 | 22 | 3880 |
| U 600 | -10 | 134.2 | 45 | ZQ850 | 23.34 | 55 | 7090 |
To meet the diverse conveying needs of the rice processing industry, we offer several different types of Rice Grain U-Shaped Screw Conveyors for customers to choose from. The core models are divided into two main categories: shafted and shaftless. Each model has its own strengths and can perfectly adapt to different material characteristics, conveying scenarios, and production capacity requirements.
Shaped U-Shaped Screw Conveyor: This is the most commonly used standard model in rice mills. It features a built-in central screw shaft with continuous screw blades, a robust structure, and high load-bearing capacity. It is suitable for conveying dry, pure, and impurity-free rice materials, such as the transfer of polished rice and clean brown rice within the workshop and for warehousing. This machine offers high conveying efficiency, stable operation, and is suitable for long-distance, high-volume operations. The screw shaft has good support, preventing shaking and deviation during operation, resulting in a longer service life. It is relatively affordable and offers excellent value for money, making it the preferred model for most standardized rice mill production lines.
Shaftless U-shaped screw conveyor: Eliminating the traditional central shaft design, it uses shaftless screw blades to directly push materials. The open, unobstructed internal space is specifically designed for conveying wet or raw rice containing small amounts of husks, straw, and impurities, completely solving the problems of tangling and jamming common in shafted conveyors. For conveying freshly harvested grains with high impurity content, the shaftless design effectively prevents husks and weeds from entangled in the screw shaft, reducing downtime for cleaning. Simultaneously, less material remains at the bottom of the trough, allowing for more thorough cleaning and preventing rice from molding or spoiling.
A large rice mill faced high rice breakage rates and severe dust pollution with its existing conveyor equipment. Replacing the conveyor with a custom-designed shafted U-shaped screw conveyor, using multiple units in series (each 25 meters long, 300mm diameter stainless steel), completely resolved the dust problem in the fully enclosed workshop. The daily production capacity of a single production line is now consistently meeting targets. The equipment has completely solved the problems of raw grain impurities entanglement and material blockage. It supports 24-hour continuous operation and is perfectly compatible with the normal operation of the production line.
When selecting a Rice Grain U-Shaped Screw Conveyor, we first consider the material characteristics. For pure dry polished rice and brown rice, shafted models are preferred; for mixed grains and wet paddy, shaftless models are recommended to avoid clogging and tangling. Secondly, we determine the conveying parameters. Based on the workshop distance and average daily conveying volume, we select the appropriate trough diameter and conveying length. Conventional rice mills commonly use 200mm and 300mm diameter models. Small-capacity mills choose short-distance, small-scale models, while large-scale production lines choose long-distance, high-capacity models. We also pay attention to the installation angle; horizontal conveying is preferred, and small-angle conveying should be controlled within 15° to avoid affecting conveying efficiency. Material requirements must also be considered. For high-standard food-grade workshops, 304 stainless steel is selected; for normal operating conditions, thickened carbon steel is chosen. Additionally, we match the motor power and speed control function to ensure synchronization with the entire production line. If necessary, we can contact the manufacturer to customize the model.
The starting price for a complete Rice Grain U-Shaped Screw Conveyor is $400. Specific pricing requires calculation based on several key parameters, including model differences, machine material, conveyor length, and trough specifications. Additional configurations such as motor power, whether variable frequency speed control, dustproof sealing, and customized inlet/outlet ports will also directly affect the final price. The manufacturer supports customized solutions, taking into account the customer's conveying capacity, workshop conditions, and export standards to calculate costs item by item. This ensures a balance between meeting the basic conveying budget of small rice mills and adapting to the high-end customization needs of large grain and oil production lines, balancing cost-effectiveness and adaptability.
Dahan Machinery possesses mature Rice Grain U-Shaped Screw Conveyor production technology and customization capabilities, and is a long-term cooperative supplier for rice mills and grain and oil processing enterprises. The manufacturer boasts standardized production workshops and a professional R&D team, strictly adhering to grain industry hygiene and quality standards. Customized services are available, with specifications tailored to customer workshop layouts and production capacity needs. Free on-site surveys, solution design, and factory commissioning are provided – a one-stop service. After-sales support includes warranty, ample spare parts supply, and rapid response, avoiding future maintenance challenges.
The Rice Grain U-Shaped Screw Conveyor, a core conveying equipment in rice mills, offers advantages such as low breakage, high efficiency, and easy maintenance. It is suitable for the entire rice conveying process, with both shafted and shaftless models to cover different material conditions.
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