MG Double Girder Gantry Crane with Hook: Structure, Specs & Applications
An MG double girder gantry crane with hook is a heavy-duty, outdoor lifting solution built for high-capacity, long-span operations in steel, precast, shipyards, construction, power, and logistics yards. With a box-girder double-beam structure, precision hook block, and configurable hoisting/gantry drives, MG gantry cranes deliver rigidity, stability, and throughput where bridge cranes or rubber-tyred solutions are not feasible.
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Table of Contents
1.What Is an MG Double Girder Gantry Crane with Hook
2.Structure & Main Components
3.How It Works (Hoisting, Traveling & Controls)
4.Safety & Reliability Features
5.Typical Applications
6.Specs & Configurations (Ranges)
7.Selection Checklist (RFQ)
8.FAQs
1) What Is an MG Double Girder Gantry Crane with Hook
MG refers to a double-girder gantry crane running on ground rails. The two box-girder main beams form a rigid portal supported by A-type or U-type legs. A hook block is used as the primary lifting attachment, making MG suitable for a wide variety of loads—from steel coils, billets, slabs, molds to precast segments and equipment modules.
Key value vs. lighter gantries: higher capacity, longer spans, reduced deflection, and better load distribution for long or heavy pieces.
2) Structure & Main Components
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Double Box Girders: Welded box sections provide stiffness and low deflection for precise handling at long spans.
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Trolley & Hoisting Mechanism: Wire-rope hoist (open winch or compact hoist) with hook block, sheaves, and overload protection.
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Portal & Legs (A- or U-type): Optimized for site access, wind resistance, and ground clearance.
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End Carriages & Rail Wheels: Gantry travel bogies with drive/brake/encoder; options for wheel-slip monitoring and rail cleaning.
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Power & Cabling: Festoon, cable reel, or busbar; protection for outdoor environments.
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Controls: Cab control, pendant, or radio remote; VFDs for smooth acceleration and precise positioning.
3) How It Works (Hoisting, Traveling & Controls)
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Hoisting: The trolley winch reduces the swing Angle and improves the placement accuracy through VFD variable frequency speed regulation, point operation and anti-sway logic.
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Trolley Travel: Cross travel along the double girders ensures accurate load positioning across the span.
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Gantry Travel: Long-travel drives move the crane along ground rails to serve multiple bays or storage rows.
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Controls & Automation: From basic radio remote to semi-auto positioning, data logging, and maintenance diagnostics—tailored to duty class and safety standards.
4) Safety & Reliability Features
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Overload limiter & torque protection
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Anti-sway control and smooth VFD motion on all axes
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Upper/lower limiters, travel limit switches, and emergency stop circuits
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Wind-proofing: rail clamps, storm locks, anemometer alarms for outdoor sites
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Over-speed & over-heat protection for motors/gearboxes
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Electrical protection: phase loss/reversal detection, IP-rated enclosures, surge protection
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Predictive maintenance hooks: run-time counters, fault logs, greasing/inspection reminders
5) Typical Applications
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Steel & Metals: coils, billets, slabs, plates—hook, C-hook, and spreader beams
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Precast & Construction: girders, box segments, molds, rebar cages
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Shipyard & Marine: blocks, equipment modules, out-of-gauge cargo
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Power & Heavy Industry: turbines, generators, transformers
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Logistics Yards: heavy equipment, tooling, oversized crates
6) Specs & Configurations (Ranges)
All ranges are customizable. Final parameters depend on duty class, load geometry, wind area, ground bearing, and workflow.
| Parameter | Typical Range / Options |
|---|---|
| Rated Capacity | 10–320 t (custom higher available) |
| Span | 10–40 m (beyond on request) |
| Hook Lift (H) | 6–30 m (application-specific) |
| Duty Class | ISO/FEM classes (e.g., A5–A8), matched to cycles/hour |
| Hoisting Speed | Multi-speed or VFD, e.g., 0.5–10 m/min (range-based) |
| Trolley Speed | VFD, e.g., 2–40 m/min |
| Gantry Speed | VFD, e.g., 4–40 m/min |
| Legs | A-type or U-type; portal clearance per load/vehicle envelope |
| Controls | Cab / pendant / radio; optional semi-auto positioning |
| Power Supply | Cable reel / busbar; outdoor-rated electrics |
| Environment | -20°C to +40°C typical (low-temp/corrosion packages available) |
Common Options: dual-hook sync lifting, fine-positioning mode, storm locks, rail sweeps, load display, black-box recorder, maintenance platform, corrosion class upgrades.
7) Selection Checklist (RFQ)
Prepare these details to speed up engineering and quotation:
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Max / typical load (t) and load type/geometry (coil, slab, girder, mold, crate)
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Span (m), hook lift (m), and required portal clearance
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Duty profile (picks/hour, shifts/day), wind zone, ambient conditions
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Rail gauge & runway length, ground bearing, approach aisles
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Controls (cab/remote), automation (anti-sway, inching, positioning)
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Power (cable reel/busbar), on-site voltage/frequency
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Delivery window, installation & training needs
Conclusion – Ensure Reliable Operation with SLKJCrane
Expert in Overhead Crane/Gantry Crane/Jib Crane/Crane Parts Solutions
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