GL Series Tubular Screw Conveyor
The GL Series Tubular Screw Conveyor is a completely enclosed material handling system designed for dust-tight conveying of powders, granules, and small particle materials. Featuring seamless steel tubing and precision-engineered helical flights, our tubular screw conveyors provide zero-emission transfer while maintaining maximum material integrity. Ideal for food processing, pharmaceutical, chemical, and mineral industries where contamination control is critical.
- 100% Dust-Free Operation
- Multi-Directional Flexibility
- Sanitary Construction
- Low Maintenance
- High-Efficiency Drive
- Explosion-Proof Options
- Custom Configurations
Industry-Leading HL Series Bucket Elevator Manufacturer
As a leading manufacturer of GL Series Tubular Screw Conveyors, DARKO combines over a decade of material handling expertise with cutting-edge engineering to deliver fully enclosed, dust-tight conveying solutions for industries worldwide. Our ISO-certified systems, exported to 30+ countries, provide reliable powder and granule handling for cement, mining, food processing, chemical, and construction applications—ensuring high-capacity, energy-efficient, and contamination-free material transfer.
Reliable Material Transportation Solutions
Heavy-duty chain drive for high-temperature materials (up to 250°C)
Gentle plate-chain design minimizes material breakage (ideal for fragile goods).
Quiet belt operation with 15% lower energy consumption (best for lightweight materials).
- Technical Specifications
- Key Advantages
- Applications
| Parameter | GL-150 | GL-200 | GL-250 | GL-300 | GL-400 |
|---|---|---|---|---|---|
| Pipe Diameter (mm) | Φ159 | Φ219 | Φ273 | Φ325 | Φ426 |
| Screw Diameter (mm) | Φ146 | Φ194 | Φ245 | Φ295 | Φ395 |
| Standard Pitch (mm) | 120-150 | 150-200 | 200-250 | 250-300 | 300-400 |
| Capacity (m³/h) | 5-15 | 10-30 | 20-50 | 30-80 | 50-120 |
| Speed Range (rpm) | 40-120 | 40-100 | 30-80 | 30-60 | 20-50 |
| Motor Power (kW) | 1.5-3.0 | 2.2-5.5 | 3.0-7.5 | 5.5-11 | 7.5-22 |
| Max. Length (m) | 20 | 25 | 30 | 30 | 30 |
| Allowable Inclination | 0-30° (Standard) | 0-30° (Standard) | 0-30° (Standard) | 0-30° (Standard) | 0-30° (Standard) |
| 30-90° (Custom) | 30-90° (Custom) | 30-90° (Custom) | 30-90° (Custom) | 30-90° (Custom) | |
| Working Pressure (MPa) | ≤0.6 | ≤0.6 | ≤0.6 | ≤0.6 | ≤0.6 |
| Material Temp. Limit | ≤200°C | ≤200°C | ≤200°C | ≤200°C | ≤200°C |
| High-Temp. Version | ≤400°C (Custom) | ≤400°C (Custom) | ≤400°C (Custom) | ≤400°C (Custom) | ≤400°C (Custom) |
| Noise Level (dB) | ≤75 | ≤78 | ≤80 | ≤82 | ≤85 |
| Weight (kg/m) | 45-60 | 65-85 | 85-110 | 110-140 | 140-180 |
Key Notes:
✔ 100% Dust-Free & Leak-Proof – Hermetically sealed for zero product loss and no cross-contamination
✔ Multi-Directional Flexibility – Handles horizontal, inclined (up to 30°), and vertical configurations
✔ High Capacity (5–120 m³/h) – Optimized for powders, granules, and small-particle materials
✔ Energy Efficient – 15–30% lower power consumption vs. traditional conveyors
✔ Hygienic & Corrosion-Resistant – Available in 304/316L stainless steel (FDA/USDA compliant) or wear-resistant carbon steel
✔ Low Maintenance – Bearing-less design reduces wear points and downtime
1. Cement & Building Materials
Sealed transfer of raw meal, cement, fly ash, and slag
2. Food & Grain Processing
Hygienic conveying of flour, sugar, starch, milk powder, and additives
3. Chemical & Pharmaceutical
Contamination-free handling of powders, granules, and API intermediates
4. Mining & Minerals
Abrasion-resistant transport of silica sand, alumina, and ores
5. Battery & Specialty Materials
Precision conveying of lithium battery anode/cathode powders
Working Principle of GL Series Tubular Screw Conveyors
The GL Series Tubular Screw Conveyor moves materials through a sealed pipe using a rotating helical screw. As the screw turns, its blades generate axial thrust to push powders or granules forward while centrifugal force presses material against the pipe wall, preventing clogging. The fully enclosed design ensures dust-free transport for horizontal, inclined (≤30°), or custom vertical applications. Material enters via the inlet, is conveyed along the pipe, and discharges at the outlet—all with minimal breakage thanks to precise blade-pipe clearance (≤5mm). Speed-adjustable drives optimize flow rates from 5-120 m³/h.
Related Products
Why Choose the GL Series Tubular Screw Conveyor?
1. 100% Dust-Free & Leak-Proof
Fully sealed design prevents material loss and contamination—ideal for food, pharma, and hazardous powders.
IP65 protection for outdoor or humid environments.
2. Multi-Directional Flexibility
Handles horizontal, inclined (up to 30°), and vertical (custom up to 90°) layouts in one system.
Compact footprint saves 30% space vs. belt conveyors.
3. Gentle Material Handling
Low-speed rotation (20–120 rpm) minimizes product degradation (e.g., fragile granules).
<5mm blade-pipe gap reduces crushing risk vs. traditional screw conveyors.
4. Energy Efficient
15–30% lower power consumption than pneumatic systems.
Variable frequency drive (VFD) optimizes speed for demand-based operation.
5. Low Maintenance
No external bearings—only maintenance-free internal bushings.
Quick-access hatches for easy cleaning and inspection.
6. Customizable for Tough Applications
Material options: 304/316L stainless steel (food-grade), carbon steel, or wear-resistant coatings.
Special designs: ATEX explosion-proof, high-temperature (up to 400°C), or CIP/SIP washdown.
7. Proven Reliability
10,000+ installations in cement, food, chemicals, and lithium battery production.
ISO 9001 & CE certified with 2-year warranty.
Ideal for various powders, granules, and small-particle materials including:
Powders: Cement, flour, pharmaceutical powders, pigments (bulk density 0.2-2.5t/m³)
Granules: Plastic pellets, fertilizers, grains (particle size ≤1/3 pipe diameter)
Specialty Materials: Slightly sticky, fragile, or explosive materials (custom designs available)
Key comparison:
| Feature | GL Tubular | U-Trough |
|---|---|---|
| Containment | 100% sealed, dust-free | Open design, dust leakage |
| Angle Range | Horizontal/incline/vertical | Limited to ≤15° incline |
| Cleanability | Quick-open design | Dead zones hard to clean |
| Footprint | 30% space saving | Requires more space |
Standard vertical models: Up to 10m (reinforced custom designs available)
Efficiency by angle:
0-15°: 100% capacity
30°: 85-90% efficiency
90° vertical: 60-70% efficiency (requires reduced speed + increased power)