The water circulation U-shaped screw conveyor is a high-performance, integrated cooling and conveying solution engineered for high-temperature bulk solids and powders. By continuously circulating cooling water through the jacketed U-shaped trough, this system actively reduces material temperature during transport, effectively preventing issues like caking, degradation, or combustion. Ideal for processes requiring precise thermal management, our screw conveyor enhances product quality, ensures downstream process stability, and minimizes material waste—all in a single, reliable unit.
The working principle of the water circulation U-shaped screw conveyor is similar to that of the ordinary screw conveyor. The high-temperature material is pushed forward by the rotation of the screw. The material enters the conveying trough of the U-shaped auger screw conveyor from the feed port. When the screw starts to rotate, the material moves along the conveying trough with the rotation of the screw, and the cooled material is discharged through the discharge port, which can be directly conveyed to the next processing stage or storage equipment.
Compared with other types of screw conveyors, the U-shaped screw conveyor has some unique advantages in design. First, its head and tail bearings are moved outside the shell, and the hanging bearing adopts a sliding bearing with a dustproof sealing device, which improves the reliability and service life of the equipment. Secondly, the suspension shaft and the screw shaft are connected by a slider, which makes maintenance more convenient. These designs make the U-shaped screw conveyor extremely convenient in installation and maintenance, and also improve work efficiency.
The operation of the water circulation U-shaped screw conveyor follows a synchronized process of mechanical conveying and heat exchange:
Material Feeding & Propelling: Material enters the U-shaped trough via the feed port. Driven by the motor, the rotating screw blade continuously pushes the material forward along the trough.
Active Cooling: Simultaneously, cooling water is pumped through the external jacket and/or internal hollow screw shaft. As the material advances, heat is continuously transferred to the water, achieving the desired cooling effect.
Controlled Discharge: The cooled material reaches the discharge port and is released, ready for packaging, storage, or the next production stage.
Key Technical Parameters (Typical Range):
| Parameter | Specification / Range |
| Screw Diameter | 200 mm – 800 mm |
| Trough Length | 2 m – 20 m (customizable) |
| Motor Power | 2.2 kW – 45 kW |
| Cooling Water Temperature | 5°C – 25°C (depending on chiller system) |
| Cooling Capacity | Up to ~20°C – 30°C temperature drop per pass (material-dependent) |
| Conveying Capacity | 1 – 50 tons/hour (adjustable via variable frequency drive) |
1. U-shaped trough: It has a U-shaped structure, contains materials, and guides the materials to move forward along the spiral blades. The material is usually stainless steel or wear-resistant material.
2. Spiral blade: It is installed on the spiral shaft and maintains a certain gap with the inner wall of the U-shaped trough. The blade can be customized according to the characteristics of the material, such as solid blades, belt blades, etc.
3. Spiral shaft: It is connected to the motor to drive the spiral blade to rotate. The material is usually carbon steel or stainless steel, with sufficient strength and rigidity.
4. Drive device: It is usually a motor to provide power for the spiral shaft. The frequency converter can be optionally equipped to achieve stepless speed regulation.
5. Bearing: Support the spiral shaft, reduce friction, and ensure the smooth operation of the equipment.
6. Sealing device: Prevent material leakage and ensure the cleanliness of the working environment.
7. Water circulation system: It includes water pumps, pipes, nozzles, etc., to provide circulating water in the U-shaped trough to achieve cooling and cleaning of materials.
To meet diverse industry requirements, our water circulation U-shaped screw conveyors are available in a variety of materials and configurations. Please refer to the table below for standard options:
| Component | Material Options | Key Feature / Benefit |
| U-shaped Trough |
Stainless Steel (304/316L): For food, pharmaceutical, or corrosive material handling. Carbon Steel: Cost-effective for general industrial use. |
Anti-corrosion, wear-resistant, and easy to clean. |
| Screw Blade |
Hardfaced Carbon Steel: For highly abrasive materials. Stainless Steel: For hygiene-critical applications. |
Extended service life; can be customized in solid, ribbon, or paddle form. |
| Cooling Jacket |
Full Jacket: Covers the entire trough bottom and sides for maximum cooling. Half-Coil Jacket: For applications requiring more controlled or targeted cooling. |
Optimized heat transfer efficiency based on cooling needs. |
| Sealing System |
PTFE Packing Seal: Standard for dust prevention. Mechanical Seal: For gas-tight or high-sanitation environments. |
Prevents leakage and ensures a clean working area. |
While the integration of a water circulation system adds functional complexity, our design effectively addresses potential operational challenges:
Challenge: System Maintenance: The additional pumps and piping require regular upkeep.
Our Solution: We incorporate quick-release couplings and a self-draining pipeline design, enabling rapid cleaning and simplified maintenance procedures, significantly reducing downtime.
Challenge: Material Contamination Risk: Improper water quality may contaminate sensitive materials.
Our Solution: We offer optional integrated water treatment units (filtration and UV sterilization) to ensure circulating water meets purity standards, preventing any secondary contamination of your product.
Challenge: Increased Energy Consumption: Operating the water pump adds to energy costs.
Our Solution: Our systems are engineered with energy-efficient pumps and a recirculation tank. This reduces fresh water consumption and optimizes overall energy usage, making the system cost-effective over its lifecycle.
The water circulation U-shaped screw conveyor is a versatile solution deployed across various sectors to solve critical thermal and material handling challenges:
Cement & Building Materials: It is used to transport hot clinker, gypsum, and other raw materials. The cooling effect prevents premature setting and protects downstream grinding equipment from thermal stress, ensuring consistent final product quality.
Chemical Industry: Ideal for conveying easily oxidizable catalysts, plastic pellets, and synthetic resins. The controlled cooling environment minimizes the risk of thermal degradation, maintains material chemical stability, and enhances operator safety.
Food & Feed Processing: Perfect for gently cooling roasted coffee beans, nuts, seeds, and extruded pet food. The system preserves flavor, aroma, and texture while ensuring the product is at a safe temperature for packaging, thereby extending shelf life.
Mining & Metallurgy: Used for conveying ores, concentrates, and smelting by-products. The robust construction and active cooling system handle abrasive materials at high temperatures, improving downstream handling and storage conditions.
Waste-to-Energy & Recycling: Plays a crucial role in conveying hot ash, slag, and carbon black powder from incinerators. It efficiently cools these residues, reducing dust emissions and preparing them for safe disposal or further processing.
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