Screw Conveyor
Conveying Equipment
Screw Conveyor
Professional Process Equipment Supplier
1. Product Overview
The screw conveyor is a continuous conveying device that uses rotating helical screw blades to push bulk materials along the axial direction within an enclosed housing. It is widely used for horizontal, inclined, or short-distance vertical conveying of powdery, granular, and small-lump materials in chemical, building materials, grain, metallurgy, and power industries. Featuring compact structure, excellent sealing, multi-point loading/unloading capability, and easy operation and maintenance, the screw conveyor is an ideal solution for enclosed bulk material handling. Based on screw blade types and arrangements, screw conveyors are available in solid flight, ribbon flight, and paddle flight variants. Conveying capacity typically ranges from 1 to 500 m³/h, with conveying lengths up to 30 meters.
2. Working Principle
The working principle is based on the axial thrust generated by the rotating screw: the motor drives the screw shaft to rotate within the enclosed housing via a gear reducer. As the screw rotates, the blades push material forward along the axial direction. Due to gravity and housing wall friction, the material does not rotate with the blades but slides forward to the discharge port. For horizontal conveying, material moves solely by blade thrust; for inclined conveying, the gravitational component must be overcome, so capacity depends on the inclination angle; vertical screw conveyors rely on centrifugal force and friction to lift material upward. Inlet and outlet ports can be flexibly positioned for multi-point loading or unloading.
3. System Classification
3.1 Classification by Screw Blade Type
| Type | Blade Form | Applicable Materials | Features |
|---|---|---|---|
| Solid Flight Conveyor | Full-section solid blades | Powdery, granular materials | High thrust, high fill rate |
| Ribbon Flight Conveyor | Ribbon-type blades | Sticky, caking materials | Anti-clogging, easy cleaning |
| Paddle Flight Conveyor | Paddle-type blades | Materials requiring mixing | Conveying + mixing function |
3.2 Classification by Layout
| Type | Layout | Max Length | Application |
|---|---|---|---|
| Horizontal | Horizontal installation | ≤30m | Most common type |
| Inclined | Inclined ≤20° | ≤15m | Elevation difference |
| Vertical | Vertical installation | ≤5m | Short-distance lifting |
4. Detailed Technical Parameters
4.1 Material of Product Contact Parts
| Component | Material | Surface Treatment | Characteristics |
|---|---|---|---|
| Housing | Q235/SS304/316L | Internal polishing | Corrosion-resistant, sealed |
| Screw Blade | 16Mn/SS304 | Weld overlay/polished | Wear-resistant, high thrust |
| Screw Shaft | 45# steel/SS304 | Quenched & tempered | High strength, rigidity |
| Hanger Bearing | Wear-resistant alloy | Precision machined | Self-lubricating, long life |
| Seals | PTFE/felt | — | Dust-proof, leak-proof |
| Liner | UHMWPE/ceramic | — | Reduce wear, lower noise |
4.2 Specification Parameters
| Parameter | Small Type | Medium Type | Large Type |
|---|---|---|---|
| Screw Diameter | 100~250mm | 250~500mm | 500~1250mm |
| Capacity | 1~30m³/h | 30~150m³/h | 150~500m³/h |
| Screw Speed | 40~150rpm | 30~100rpm | 20~60rpm |
| Conveying Length | ≤10m | 10~20m | 20~30m |
| Motor Power | 0.75~5.5kW | 5.5~30kW | 30~75kW |
| Fill Coefficient | 0.25~0.45 | 0.25~0.40 | 0.20~0.35 |
4.3 Performance Indicators
| Indicator | Parameter Value | Test Conditions |
|---|---|---|
| Capacity Deviation | Within ±5% | Continuous rated operation |
| Material Residual Rate | ≤1% | After cleaning |
| Noise Level | ≤75dB(A) | Measured at 1m |
| Bearing Temperature Rise | ≤40°C | 4-hour continuous operation |
| Housing Sealing | No dust emission | Rated load operation |
| MTBF | ≥8000 hours | Normal conditions |
4.4 Electrical Parameters
| Item | Parameter |
|---|---|
| Power Supply | 3P+N+PE, AC380V±10%, 50Hz |
| Control System | PLC/VFD control |
| Motor | YE3 high-efficiency/IP55 |
| Reducer | SEW/Guomao helical gear |
| Sensors | Level/clog detection |
| Safety | E-stop, overload protection |
| Communication | RS485/Modbus |
Note: Electrical brands configurable per request.
5. Core Component Selection
| Component | Brand | Model | Function |
|---|---|---|---|
| Reducer | SEW/NORD | R-series helical | Drive screw shaft |
| Motor | ABB/Siemens | YE3/IP55 | Power source |
| Coupling | KTR/Falk | Elastic coupling | Connect motor & reducer |
| Bearing | NSK/SKF | Spherical roller | Support screw shaft |
| Seal | John Crane | Mechanical/packing | Shaft end sealing |
| Housing | Custom | Q235/SS304/316L | Material channel |
Note: Brands configurable per customer specification.
6. Typical Application Fields
Chemical Industry: Conveying soda ash, salt, fertilizer, pesticide powders. Sealed housing prevents dust.
Building Materials: Conveying cement, fly ash, gypsum powder. Wear-resistant liners extend housing life.
Grain Industry: Conveying wheat, corn, soybeans, flour. Food-grade stainless steel meets hygiene requirements.
Metallurgy: Conveying mineral powder, coal dust, coke fines. Large-diameter high-power models.
Power Industry: Conveying fly ash, limestone powder. Integrated with dust collection systems.
7. Design Standards & Certification
| Category | Standard No. | Standard Name |
|---|---|---|
| International | ISO 9001:2015 | Quality Management System |
| International | CE | EU Machinery Directive 2006/42/EC |
| China | JB/T 7670-2008 | Screw Conveyors |
| China | GB/T 10595-2017 | Belt Conveyors (reference) |
| China | GB/T 5226.1-2019 | Electrical Safety of Machinery |
| China | GB/T 15706-2012 | Safety of Machinery |
8. Customization Options
| Option | Description | Application |
|---|---|---|
| Wear-Resistant Liner | UHMWPE/ceramic liner | Abrasive materials |
| Water Cooling Jacket | External water cooling | High-temperature materials |
| VFD Speed Control | Variable frequency drive | Flow rate adjustment |
| Explosion-Proof | ExdIIBT4 motor | Flammable materials |
| Multi-Port | Multiple inlets/outlets | Multi-station batching |
| Weighing Module | Online weighing | Batching systems |
9. Warranty Terms
| Warranty Item | Warranty Content |
|---|---|
| Machine Warranty | 12 months from acceptance |
| Core Components | Reducer/motor/bearing: 18 months |
| Wear Parts | Blade/liner/seal: 6 months |
| Training | Free training during installation |
| Response | Phone within 2h, on-site within 24h |
| Spare Parts | 5 years after discontinuation |
Note: Free repair during warranty for quality issues.
10. Packaging & Delivery
| Item | Description |
|---|---|
| Packaging | Moisture-proof film + wooden crate |
| Crate | Fumigation-free export plywood crate |
| Moisture Protection | Desiccant included |
| Transport | Truck/railway/ocean |
Lead time: 30~45 working days after contract.
11. Inquiry Information Required
To receive an accurate quotation, please provide the following information:
Material name and properties
Required capacity
Conveying length and inclination
Inlet/outlet positions
Material corrosiveness and hygiene
Installation space constraints
Power supply specifications
Explosion-proof required?
Other special requirements