✅ 20T Double Girder Semi-Gantry Crane – Product Overview
The 20-ton double girder semi-gantry crane is a heavy-duty material handling equipment designed for both indoor and outdoor use. It features a unique asymmetric structure: one side runs on ground rails via a supporting leg, while the other side is mounted on an elevated runway beam of a workshop or structure. This configuration optimizes space utilization, especially in environments with limited layout or where only one side of the factory supports a runway.
With its box-type double-girder structure and open winch trolley, the crane offers high load capacity, excellent stability, and long service life. It is widely used in industries such as steel fabrication, heavy machinery, mold assembly, shipbuilding, logistics, and power generation.
📐 Technical Specifications
| Item | Specification |
|---|---|
| Crane Type | Double Girder Semi-Gantry Crane |
| Rated Lifting Capacity | 20 tons |
| Span (Rail Gauge) | 18m / 21m / 24m / 26m / 30m (customizable) |
| Lifting Height | 6m / 9m / 10.5m / 12m (customizable) |
| Main Beam Type | Box-type double girders |
| Support Structure | One ground leg + one elevated track rail |
| Hoisting Mechanism | Open winch trolley (double drive / central drive) |
| Lifting Speed | 3.5 – 5 m/min (dual speed / VFD optional) |
| Trolley Traveling Speed | 20 – 30 m/min (VFD optional) |
| Crane Traveling Speed | 20 – 40 m/min (VFD optional) |
| Control Mode | Pendant control / Remote control / Cabin control |
| Duty Class (Working Grade) | A5 – A6 (medium to heavy duty) |
| Power Supply | 3-phase AC 380V 50Hz (customizable) |
| Power Transmission | Festoon cable / Cable reel / Busbar system |
| Protection Grade | IP54 / IP55 (according to site requirements) |
| Braking System | Electromagnetic brake with fail-safe function |
| Safety Devices | Limit switches, buffers, anti-wind anchor, E-stop |
| Operating Temperature | -20°C ~ +40°C (optional cold-weather/ex-proof) |
| Paint Coating | Primer + Epoxy/Polyurethane top coat ≥120μm |
⭐ Key Features & Advantages
Strong Load Capacity: Double girder design ensures high rigidity and stability under heavy loads.
Space-Efficient Structure: Ideal for workshops with only one side of overhead runway available.
Smooth Operation: High-performance motors and gearboxes with optional VFD drive.
Flexible Control Options: Multiple control modes to suit diverse operation needs.
Comprehensive Safety Protection: Equipped with overload limiters, travel limits, wind protection, etc.
Customizable Design: Span, lifting height, control system, and other parameters can be tailored.
🔧 Optional Features
PLC smart control system
Wireless load monitoring system (black box integration)
Explosion-proof electrical configuration
Remote diagnostics and maintenance interface
Anti-wind and anti-slip mechanisms for outdoor use
📎 We provide complete documentation for export use, including 3D models, CAD drawings, foundation diagrams, user manuals, CE/ISO certificates, and electrical schematics upon request.
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