MG Type Double Beam Girder Gantry Cranes

Key Features of MG Type Double Girder Gantry Cranes:

Double Girder Design

Provides higher lifting capacity (typically 5 to 550 tons) compared to single girder cranes.

Offers better stability and load distribution.

Gantry Structure

Moves on rails or wheels along the ground, eliminating the need for overhead runway beams.

Can be semi-gantry (one leg supported by a building structure) or full gantry (both legs ground-supported).

Hoisting Mechanism

Equipped with an electric hoist or trolley that travels along the girders.

Can include single or double hoists for different lifting needs.

Applications

Heavy industries (steel plants, shipyards, foundries).

Ports & logistics (container handling, bulk material movement).

Construction sites (prefabricated structure assembly).

Power plants & large workshops.

Customizable Options

Span & Lifting Height: Adjustable based on workspace requirements.

Control Systems: Pendant control, remote control, or cabin-operated.

Special Features: Explosion-proof, high-temperature resistance, or outdoor use with weather protection.

 

Advantages of MG Double Girder Gantry Cranes:

✔ Higher load capacity than single girder models.
✔ Greater span and lifting height capabilities.
✔ More stable and durable for heavy-duty operations.
✔ Can be used both indoors and outdoors.

Comparison with Other Gantry Cranes:

Feature	MG Double Girder	Single Girder Gantry	Rubber-Tired Gantry (RTG)
Capacity	5–550+ tons	1–20 tons	30–100+ tons
Span	10–35m+	5–25m	Adjustable
Mobility	Rail-mounted	Rail or wheels	Rubber tires (port use)
Cost	Higher	Lower	Very high

 

Core Components：Bearing, Gear, Gearbox, Motor

Place of Origin：Henan, China

Warranty：1 Year

Weight (KG)：2000 kg

Video outgoing-inspection：Provided

Machinery Test Report：Provided

Keywords：gantry crane

Color: Customized

Size: Customized

Design: computer optimization design

Safety: High flexible flat cable power

Application: construction industrial,workshop,warehouse

Working class: A3-A8

Certification: ISO,CE,BV,S GS,TUV

Power Source: 380~480V,customized

 

 

MG Type Double Beam Girder Gantry Crane – Main Components
MG Type Double Girder Gantry Cranes consist of several key structural and mechanical components that work together to ensure safe and efficient lifting operations. Below is a detailed breakdown:

1. Bridge (Main Girders)
Function: The primary load-bearing structure that spans the work area.

Design: Two parallel girders (box-type or truss-style) made of high-strength steel.

Features:

Supports the trolley and hoist.

Designed for high rigidity to prevent deflection under heavy loads.

 

 

2. End Carriages (Legs & Supports)
Function: Supports the bridge and allows movement along the runway rails.

Components:

Vertical legs (fixed or adjustable height).

End trucks with wheels for movement.

Buffers & bumpers to absorb shocks.

Types:

Full gantry: Both legs run on ground rails.

Semi-gantry: One leg runs on a rail, while the other is supported by a building structure.

 

 

3. Trolley & Hoisting Mechanism
Function: Moves along the girders to lift and transport loads.

Components:

Electric hoist (wire rope or chain).

Trolley frame with drive motors.

Drum, hook, and pulley system.
 

Options:

Single/double hoist configurations.

Variable speed control for precision lifting.

4. Runway System (Rails & Beams)
Function: Provides a track for the gantry crane to move.

Components:

Steel rails (mounted on the ground or elevated beams).

Rail clamps & fasteners for stability.

Crane travel drives (motors, gearboxes, wheels).

 

5. Electrical & Control System
Function: Powers and controls crane operations.

Components:

Main control panel (PLC/VFD for smooth operation).

Limit switches (overload, height, travel limits).

Control methods: Pendant, remote, or cabin-operated.

Power supply: Festoon system (cable reels or conductor bars).

.

6. Safety & Auxiliary Components
Safety Features:

Overload protection (load cells/limiters).

Emergency stop buttons.

Anti-collision systems (for multiple cranes).

Wind-resistant brakes (for outdoor use).

Auxiliary Components:

Cabin (operator's cabin for better visibility).

Lighting & warning alarms.

Summary of Key Components

Component	Function	Key Parts
Bridge Girders	Main load-bearing structure	Double steel beams
End Carriages	Supports & mobility	Legs, wheels, buffers
Trolley & Hoist	Lifting mechanism	Hoist, motor, hook, drum
Runway System	Movement track	Rails, drive motors
Electrical System	Power & control	Control panel, limit switches
Safety Devices	Prevents accidents	Overload limiter, E-stop

 

SKETCH

 

Main technical

 

Advantages of MG Double Girder Gantry Cranes

1. High Load Capacity & Stability

Designed with two parallel girders (box-type or truss-style), these cranes can handle 5 to 550+ tons, making them ideal for heavy-duty lifting.

The double girder structure distributes weight more evenly, reducing deflection and improving stability compared to single-girder models.

2. Greater Span & Lifting Height

Suitable for wide workspaces (spans up to 35m+) and high lifting requirements (e.g., shipyards, power plants).

Adjustable end carriages allow customization for different runway heights.

3. Durability & Long Service Life

Made from high-strength steel with precision welding to minimize deformation and stress.

Corrosion-resistant coatings and weatherproof designs make them suitable for outdoor use (e.g., ports, construction sites).

4. Advanced Control & Safety Features

Equipped with variable frequency drives (VFDs) for smooth operation and PLC-based automation for precise load handling.

Safety mechanisms include overload limiters, emergency brakes, and anti-collision systems.

5. Customizable for Specialized Needs

Options include explosion-proof motors, high-temperature resistance, and specialized trolleys (e.g., magnet, grab bucket).

Can be designed as full gantry (ground rails) or semi-gantry (one leg on a building structure).

Key Applications

1. Shipbuilding & Ports

Used in shipyards for assembling large ship sections (e.g., hull blocks) due to their high lifting capacity.

In container terminals, they handle heavy cargo loading/unloading.

2. Heavy Industry & Steel Plants

Lift steel coils, castings, and machinery in foundries and rolling mills.

Truss girder designs (like double-girder-truss cranes) are used in large-scale industrial projects.

3. Power Plants & Hydropower Stations

Install turbines, generators, and large components in hydroelectric and thermal power plants.

Some models feature high-strength bolted connections for quick assembly in remote sites.

4. Construction & Infrastructure

Lift prefabricated concrete segments and bridge girders in large-scale projects.

Rail-mounted variants ensure precise positioning in confined spaces.

5. Warehousing & Logistics

Move heavy pallets, machinery, and bulk materials in large storage yards.

 

 

1. Design and Engineering

Requirement Analysis

Understand the client's specifications (load capacity, span, height, working environment, etc.).

Determine operational parameters: lifting height, travel speed, working frequency, etc.

Preliminary Design

Create conceptual designs and 3D models.

Choose materials based on strength and environmental conditions.

Detailed Engineering

Develop detailed engineering drawings (structural components, mechanisms, electrical systems).

Perform stress and fatigue analysis to ensure safety.

2. Material Procurement

Source high-quality materials, including:

Steel plates and profiles for structural components.

Motors, gearboxes, and other mechanical parts.

Electrical systems and control components.

Inspect materials to ensure compliance with quality standards.

3. Fabrication

Structural Component Fabrication

Cut, weld, and assemble the steel structures (main girder, cantilever arms, legs, etc.).

Ensure precise alignment and dimensions.

Perform surface treatment (e.g., shot blasting, painting) for corrosion protection.

Mechanical Assembly

Assemble mechanical parts (trolley, hoist, wheels, etc.).

Install motors, gearboxes, and drive systems.

Electrical Assembly

Install electrical components (control panels, cables, sensors).

Wire and connect the system to ensure functionality.

4. Quality Inspection

Material Inspection

Verify material certification and conduct tests (e.g., tensile tests).

Structural Inspection

Inspect weld quality (e.g., ultrasonic testing).

Ensure dimensional accuracy and surface finishing.

Assembly Inspection

Check alignment and functionality of all parts (mechanical and electrical).

Load Testing

Conduct static and dynamic load tests to ensure safe operation.

5. Factory Acceptance Testing (FAT)

Conduct a comprehensive trial run, including:

Full load and overload tests.

Functionality of all safety devices (e.g., limit switches, emergency brakes).

Smooth operation of trolley, hoist, and crane travel.

Document results and obtain client approval.

6. Disassembly and Packing

Disassemble the crane into transportable sections.

Pack components securely to prevent damage during transportation.

Label and prepare a packing list for efficient reassembly.

7. Transportation

Deliver the crane components to the installation site using appropriate transportation methods.

8. Installation and Commissioning

On-Site Assembly

Assemble structural components and mechanical systems.

Install electrical systems and control panels.

Calibration and Testing

Recalibrate the crane system for site-specific conditions.

Perform on-site load testing to verify performance.

9. Handover

Provide training to the client's personnel on safe operation and maintenance.

Deliver technical documentation (user manual, maintenance guide, certificates).

Obtain final approval and acceptance from the client.

10. After-Sales Support

Offer warranty services and maintenance support.

Provide spare parts and technical assistance as needed.

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%.