The QD Heavy Duty Double Girder Overhead Crane is engineered for demanding industrial environments, offering robust lifting capabilities, precision control, and compliance with international safety standards. Designed for applications requiring high-frequency operation and heavy-load handling, it is widely used in steel mills, ports, foundries, and logistics hubs.
High Lifting Capacity:
5–800 tons, with dual-hook configurations (e.g., 16/3.2t, 50/10t, 200/50t) for simultaneous handling of primary and auxiliary loads.
Supports A5–A8/M5–M8 work duty classes (heavy to extreme duty cycles).
Structural Design:
Double box-girder bridge for superior rigidity and load distribution.
Reduced self-weight (15–30% lighter than traditional models) and lower wheel pressure (10–35% reduction), minimizing structural demands on buildings.
Performance Specifications:
Hoisting: 0.15–63 m/min (dual-speed options for precision).
Trolley Travel: 10–63 m/min.
Crane Travel: 16–110 m/min (frequency inverter control optional).
Span: 10.5–40.5 meters (customizable up to 34m for ultra-heavy models).
Lifting Height: 12–60 meters (adjustable for specific workflows).
Speeds:
Safety & Compliance:
Overload protection, emergency stops, and anti-collision systems.
Complies with FEM, DIN, and IEC standards for global interoperability.
Control Options:
Cabin, remote, or ground control.
PLC automation and variable frequency drives (VFDs) for smooth operation.
| Parameter | Standard Range | Example Models |
|---|---|---|
| Capacity | 5–800 tons | 20/5t, 50/10t, 200/50t |
| Span | 10.5–40.5m | 31.5m (common for workshops) |
| Lifting Height | 12–60m | 16m (main hook), 22m (aux.) |
| Work Duty | A5–A8 (ISO 4301-1) | A5 (medium), A7 (severe) |
| Power Supply | 380V, 50Hz, 3-phase | 55.6kW (for 20t/10.5m span) |
| Electrical Components | Schneider, CHINT | HRB bearings, forged hooks |
Steel Mills: Handling molten metal, coils, and heavy machinery.
Ports & Shipyards: Loading/unloading containers, bulk cargo, and ship components.
Warehouses: High-volume material stacking with dual-hook efficiency.
Power Stations: Assembly and maintenance of turbines and generators.
Automotive Plants: Moving large assemblies (e.g., chassis, engines).
Space Efficiency: Compact trolley design maximizes vertical workspace.
Cost Savings: Reduced energy consumption and lower building modification costs.
Durability: High-quality carbon steel (Q235B/Q345B) construction ensures longevity.
Customization: Configurable for high-temperature, explosion-proof, or insulated environments.
| Feature | QD Double Girder | Single Girder |
|---|---|---|
| Max Capacity | 800 tons | 20 tons |
| Work Duty | A3–A8 (heavy/severe) | A1–A5 (light/moderate) |
| Span | Up to 40.5m | Up to 31.5m |
| Cost | Higher upfront investment | Lower initial cost |
Selection and Maintenance Suggestions
Selection and Configuration
Span > 22m: H-beam main girder is preferred to enhance torsional resistance.
High-frequency usage scenarios: Upgrade to A6 working level, extending the service life of steel wire rope by 40%.
Customization requirements: Dual cab (bidirectional operation across the factory building) or magnetic levitation track (zero friction loss) are available as options. Installation and maintenance
Track installation: Straightness error ≤ 2mm/10m, fixed with embedded bolts (not welded).
Lubrication cycle: Replace the lubricating oil in the gearbox every 3 months, and check the broken wire rate of the steel wire rope weekly (replace if it exceeds 10%).
Electrical inspection: Test insulation resistance monthly (≥ 1MΩ), and clean the dust off the inverter radiator every quarter.
Yes, because the working condition are different, all our products are customized depending on detail requirement! So all your products will be specially designed by our engineers according to your workshop conditions.
Yes, all kinds of certification are available, if you have doubt, you can come to our factory and test it by yourself,or you can let some third-partied to do the inspection for you.
Yes, we have. But we only have the standard-sized products, if you need customized products, then it will take some time to manufacture it.
It depends on your products quantity and products data you given, but we will try our best to deliver your products as soon as possible.
We will sent you the detail installation manual or if you are needing, our installation engineers can come to your workshop to guide the installation.
You can come to our factory anytime when you are convenient. We will make arrangement to pick you up.
