Large Bore Helical Flight – High-Performance Conveying Solution

Product Overview

The Large Bore Helical Flight is a critical component in screw conveyors and auger systems, designed for heavy-duty bulk material handling applications. Manufactured by Jiahe Conveying Equipment Technology Co., Ltd, these helical flights are engineered to provide superior strength, durability, and efficiency in demanding industrial environments.

Featuring an enlarged central bore for accommodating larger shafts, our helical flights ensure enhanced structural stability while maintaining optimal material flow characteristics. Available in continuous, sectional, and variable-pitch configurations, they are widely used in industries requiring high-capacity material transport with minimal maintenance.

Key Features

1. Robust Construction for Heavy-Duty Applications

• Large central bore (50–300mm standard, up to 500mm custom) for increased shaft compatibility

• Manufactured from high-grade materials (carbon steel, stainless steel 304/316, or wear-resistant alloys)

• Precision-formed helical geometry for consistent pitch accuracy (±0.5mm tolerance)

2. Optimized Material Flow & Efficiency

• Smooth helical profile minimizes material buildup and bridging

• Customizable pitch & flight thickness for different material characteristics (powders, granules, sludge, etc.)

• Surface finishes (Ra ≤ 3.2μm standard, with optional coatings for reduced friction)

3. Enhanced Durability & Wear Resistance

• Hardened edges available for abrasive materials (e.g., minerals, cement, ores)

• Wear-resistant overlays (tungsten carbide, Hardox, or chrome plating)

• Corrosion-resistant stainless steel options for food, chemical, and marine applications

4. Flexible Installation & Maintenance

• Bolt-on or welded attachment for easy assembly and replacement

• Segmented design allows partial repairs without full disassembly

• Compatible with various shaft connections (keyed, splined, or flanged)

Technical Specifications

Performance Characteristics

• High Load Capacity: Supports axial loads up to 50kN and torsional moments exceeding 2000Nm

• Balanced Operation: Dynamic balancing (G6.3 grade) for high-speed applications (up to 300 RPM)

• Temperature Resistance: Operates in -40°C to +450°C environments

• Extended Service Life: 3–5 times longer than standard helical flights in abrasive applications

Applications

1. Mining & Mineral Processing

• Ore & aggregate conveying

• Tailings & slurry transport

• Mineral concentrate handling

2. Cement & Construction Materials

• Raw meal & clinker transport

• Fly ash & gypsum conveying

• Bulk cement screw feeders

3. Chemical & Petrochemical Industry

• Plastic pellet & powder handling

• Fertilizer & granule transport

• Hazardous material conveying (ATEX-compliant options available)

4. Food & Agriculture

• Grain, flour, and sugar transport

• Animal feed processing

• Biomass & agricultural waste handling

5. Waste & Recycling

• Municipal solid waste (MSW) conveying

• Sludge & dewatering systems

• Scrap metal & recycling material transport

Customization Options

Jiahe Conveying provides tailored solutions for specialized applications:

• Material Selection:

• Carbon steel (Q235, Q345) – General-purpose applications

• Stainless steel (304, 316L, 2205 duplex) – Corrosion resistance

• Abrasion-resistant alloys (Hardox, NM series) – Extended wear life

• Surface Enhancements:

• Hard chromium plating (0.05–0.15mm) – Reduced friction

• Tungsten carbide overlay (3–8mm) – Extreme abrasion resistance

• Rubber lining (5–15mm) – Noise reduction & impact absorption

• Special Geometries:

• Variable pitch flights – For mixing & controlled discharge

• Tapered flights – For compacting applications

• Notched edges – Prevents material sticking

• Connection Systems:

• Keyed, splined, or flanged shafts

• Locking mechanisms (set screws, clamping collars)

Quality Assurance & Testing

All Large Bore Helical Flights undergo stringent quality checks:

✔ Material Certification (MTC, chemical composition analysis)
✔ Dimensional Inspection (CMM for critical tolerances)
✔ Non-Destructive Testing (NDT) – Ultrasonic (UT), Magnetic Particle (MT), or Dye Penetrant (PT)
✔ Load Testing – Proof-tested to 150% of rated capacity
✔ Surface Roughness Verification – Ensures smooth material flow

Installation & Maintenance Guidelines

Installation Best Practices

1. Shaft Alignment: Ensure concentricity (<0.1mm TIR per meter)

2. Proper Fastening: Apply recommended torque for bolted connections

3. Gradual Start-Up: Conduct trial runs with incremental speed increases

4. Lubrication (if applicable): Use high-temperature grease for shaft interfaces

Maintenance Recommendations

• Quarterly inspections for abrasive applications

• Vibration monitoring (should not exceed 4.5mm/s RMS)

• Wear measurement at designated checkpoints

• Flight replacement when thickness reduces below minimum safety limits

Why Choose Jiahe Conveying?

✅ 25+ Years of industry expertise in helical flight manufacturing
✅ ISO 9001:2015 Certified production facilities
✅ Custom Engineering Support for unique applications
✅ Global Supply Network with reliable lead times
✅ Comprehensive After-Sales Service

For technical consultation or custom solutions, contact our engineering team today!