MGH Gantry Crane

What is an MGH Gantry Crane?

An MGH Gantry Crane is a self-supporting, floor-mounted overhead crane. Unlike bridge cranes that run on elevated runways attached to a building, a gantry crane travels on wheels along rails or tracks embedded in or laid on the workshop floor. It has a fixed or adjustable span supported by legs (either one or two, depending on type). It is a versatile solution for outdoor applications or buildings where installing a runway structure is impossible or too costly.

 

Why Choose an MGH Gantry Crane? Advantages

No Building Dependency: Does not transfer loads to the building structure. Ideal for old buildings, temporary sites, or outdoor yards.

Cost-Effective Installation: Often lower initial cost than a top-running bridge crane, as it requires no heavy runway beams and columns.

Maximum Floor Coverage: Can serve a large rectangular area without obstructions. Can be designed with cantilevers to extend reach beyond the legs.

Mobility & Flexibility: Can be relocated if needed (though not easily). Some designs allow for transfer cars to move gantries between parallel tracks.

High Capacity & Span: Engineered for very heavy loads (100+ tons) and wide spans (up to 50m+ for large gantries).

 

Disadvantages & Considerations

Consumes Floor Space: The legs and runway take up valuable floor/ground area that could be used for storage or traffic.

Ground Requirements: Requires a very level, stable, and load-bearing foundation for the rails. Ground settlement can cause major alignment issues.

Lower Lifting Height: Lifting height is limited by the leg height, whereas bridge cranes can use the full building height up to the roof.

Slower Travel Speeds: Generally moves slower than bridge cranes due to stability concerns and larger moving mass.

Maintenance Access: Components like the end trucks are at ground level but can be harder to access than a centralized workshop crane.

 

Comparison: MGH Gantry vs. Top-Running Bridge Crane

Feature	MGH Gantry Crane	Top-Running Bridge Crane
Support Structure	Self-supporting legs on floor	Supported by building columns/runway
Floor Space	Uses floor space for legs/runway	Uses overhead space only
Installation Cost	Lower (no building steel)	Higher (requires reinforced runway)
Lifting Height	Limited by leg height	Maximizes building height
Ideal For	Outdoor yards, weak buildings, clear spans	Indoor factories with strong structure, high lifts
Mobility	Can be relocated (difficult)	Fixed location

 

Lifting Capacity 320 tons
Span (Width) 3 - 12 meters (adjustable)
Lifting Height 3 - 10 meters
Working Class A3-A5 (light to medium duty)
Hoisting Speed 0.5 - 8 m/min (variable)
Main Beam Type Single/double girder (box-type)
Power Supply 220V/380V 3-phase or manual
Control Mode Pendant control/wireless remote
Hoist Type Electric chain hoist/wire rope hoist
Travel Drive Manual push or motorized
Corrosion Protection Hot-dip galvanized or marine-grade paint
Wind Resistance Up to Beaufort scale 6 (for outdoor use)
Operating Temp -20°C to +50°C

The MGH Gantry Crane is a double-girder gantry crane equipped with an electric hoist trolley, designed for medium to heavy-duty lifting operations in factories, warehouses, and outdoor yards. Its structure combines the advantages of double-girder strength and hoist trolley efficiency.

 

1. Double Box Main Girders

Two welded box-type girders forming the bridge structure

High rigidity and excellent load-bearing capacity

Designed with camber to reduce deflection

Rail mounted on the top or inside for hoist trolley travel

2. Gantry Legs (Support Structure)

Rigid steel legs supporting the main girders

Can be A-frame or rigid leg + flexible leg design

Transfer loads directly to ground rails or concrete foundation

Equipped with maintenance ladders and platforms (optional)

3. End Carriages / Ground Traveling Mechanism

End beams connected to gantry legs

Forged or cast-steel wheels with bearings

Travel motors, reducers, and brakes

Enable smooth long-distance crane travel on ground rails

 

4. Electric Hoist Trolley

The core lifting unit mounted between the double girders.

Includes:

Electric wire rope hoist (CD / MD / European hoist type)

Hoist motor and reducer

Wire rope drum and shaft

Hook block and pulley system

Trolley traveling motor and gearbox

Brake system

 

 

5. Crane Traveling Mechanism

Driving motors and reducers for crane movement

Couplings, shafts, and wheel assemblies

Frequency inverter (VFD) optional for smooth acceleration

6. Electrical Control System

Main electrical control cabinet

Power distribution and protection devices

Wiring for hoist, trolley, and crane travel

Optional PLC control and frequency conversion

7. Control Devices

Pendant control

Wireless remote control

Operator cabin (optional for higher capacity models)

8. Power Supply System

Cable festoon system

Conductor bar (busbar) system

Main isolator and grounding system

 

 

 

9. Safety Protection Devices

Overload limiter

Lifting height limit switch

Trolley and crane travel limit switches

Emergency stop button

Rail sweeper and buffer

Anti-collision device (optional)

Wind alarm and rail clamp (for outdoor use)

10. Auxiliary & Optional Components

Walkways and handrails

Maintenance platforms

Anti-sway control system

Lighting system

Weatherproof covers for motors and hoist

SKETCH

 

Main technical

 

Advantages of MGH Gantry Crane

1. High Load Capacity & Structural Strength

Double-girder box structure provides excellent rigidity and stability.

Suitable for medium to heavy lifting operations.

2. Greater Lifting Height

Electric hoist trolley runs between the double girders, maximizing lifting height.

Ideal for workshops and yards with limited headroom.

3. Stable & Smooth Operation

Reduced deflection and vibration compared to single-girder gantry cranes.

Smooth lifting and traveling performance improves safety and efficiency.

4. Cost-Effective Double Girder Solution

Uses an electric hoist trolley instead of a winch trolley.

Lower cost and lighter weight than traditional heavy-duty gantry cranes.

5. Flexible Design & Customization

Span, lifting height, travel speed, and control method can be customized.

Can be designed with rigid leg + flexible leg for thermal expansion.

6. Easy Installation & Maintenance

Modular structure simplifies transportation and installation.

Easy access to hoist and electrical components reduces maintenance time.

7. Multiple Control Options

Pendant control

Wireless remote control

Operator cabin (optional for higher capacities)

8. High Safety Standards

Equipped with overload protection, limit switches, emergency stop, rail sweepers, and buffers.

Optional wind alarms and rail clamps for outdoor use.

Applications of MGH Gantry Crane

The MGH gantry crane is suitable for indoor and outdoor material handling, especially where overhead runway beams are not available.

1. Factories & Manufacturing Plants

Handling machinery parts, molds, and heavy components

Assembly and maintenance operations

2. Warehouses & Logistics Centers

Loading and unloading heavy goods

Efficient material transfer in storage yards

3. Steel & Metal Processing

Handling steel plates, coils, pipes, and profiles

Fabrication and processing workshops

4. Construction & Infrastructure Projects

Lifting precast beams, concrete components, and building materials

Bridge, tunnel, and equipment installation projects

5. Outdoor Storage Yards

Material handling in open yards where buildings are not suitable

Ideal for ports, freight yards, and equipment storage areas

6. Power Plants & Equipment Maintenance

Installation and maintenance of generators, transformers, and heavy equipment

7. Railway & Shipyard Auxiliary Operations

Handling components, tools, and maintenance equipment

Loading and unloading tasks in repair areas

The MGH Gantry Crane is a double-girder gantry crane with electric hoist trolley, manufactured under strict quality-control standards to ensure high strength, stable performance, and long service life.

 

1. Raw Material Selection & Inspection

High-quality structural steel (Q235B / Q345B) selected

Verification of material certificates and specifications

Ultrasonic testing for internal defects

Shot blasting or surface cleaning before fabrication

 

2. CNC Cutting & Plate Preparation

CNC plasma or laser cutting of girder plates, stiffeners, and diaphragms

Precision beveling of welding edges

All components marked for traceability and assembly accuracy

 

3. Double Girder Fabrication

3.1 Girder Assembly

Box-type girder formed with web plates, flange plates, and diaphragms

Assembly using special jigs to ensure dimensional accuracy

3.2 Automatic Welding

Submerged arc welding or CO₂ gas-shielded welding for main seams

Uniform weld quality with deep penetration

3.3 Stress Relief & Straightening

Vibration or heat stress relief treatment

Mechanical straightening to correct camber and deflection

3.4 Non-Destructive Testing

Ultrasonic testing (UT)

Magnetic particle testing (MT)

Visual inspection of weld seams

 

4. Gantry Leg & End Carriage Manufacturing

Welding of gantry legs (rigid and flexible leg structures)

CNC machining of wheel mounting surfaces

Installation of wheels, bearings, shafts

Assembly of motors, reducers, and brakes

Alignment and travel accuracy checks

 

5. Electric Hoist Trolley Assembly

Assembly of electric wire rope hoist (CD / MD / European type)

Installation of:

Hoist motor and reducer

Wire rope drum

Hook block and pulley system

Assembly of trolley traveling mechanism

Brake and safety device installation

 

6. Electrical System Production

Assembly of electrical control cabinet

Installation of contactors, relays, PLC, VFD (optional)

Wiring of power, control, and signal circuits

Installation of:

Overload limiter

Limit switches

Emergency stop system

Electrical testing and insulation resistance checks

 

7. Surface Treatment & Painting

7.1 Shot Blasting

All steel structures blasted to Sa2.5 standard

7.2 Painting System

Epoxy zinc-rich primer

Epoxy intermediate coating

Polyurethane topcoat

Total paint thickness customized according to environment

 

8. Pre-Assembly & Factory Testing

Assembly of girders, gantry legs, end carriages, and hoist trolley

Installation of power supply system (busbar or festoon cable)

No-load test for lifting and traveling

Static load test (125% rated load)

Dynamic load test (110% rated load)

Safety device function testing

 

9. Packing & Transportation

Electrical parts packed in wooden cases

Hoist trolley protected with steel frame

Girders and legs wrapped with waterproof materials

Shipment by container or bulk cargo

 

10. On-Site Installation & Commissioning

Installation of ground rails and crane structure

Assembly of hoist trolley and electrical wiring

Rail alignment and calibration

Final load testing and commissioning

Operator training and safety instruction

 

11. Final Inspection & Acceptance

Performance inspection and documentation

Issuance of quality certificates and manuals

Warranty and after-sales support provided

 

Workshop view:

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.