Outdoor Double Gantry Crane

 

Types of MG Gantry Cranes:

Rail-Mounted MG Gantry Crane – Runs on fixed tracks for high precision.

Rubber-Tired Gantry (RTG) Crane – Mobile version for ports and container handling.

Semi-Gantry Crane – One side supported by a leg, the other by a runway beam.

 

Comparison: Rail-Mounted vs. Rubber-Tired Outdoor Gantry Cranes

Feature	Rail-Mounted Gantry	Rubber-Tired Gantry (RTG)
Mobility	Fixed path (rails)	Moves freely on ground
Stability	Very stable	Requires outriggers
Installation Cost	Higher (needs rails)	Lower (no rails needed)
Maintenance	Less tire wear	Tires need replacement
Best For	Permanent outdoor yards	Ports, temporary sites

 

Key Features of MG-Type Gantry Cranes:

Double-Girder Design

Uses two main girders (beams) for enhanced strength and stability.

Suitable for heavy-duty lifting (typically 5 tons to over 500 tons).

High Lifting Height

Can be designed with fixed or adjustable lifting heights depending on the application.

Travel Mechanism

Moves on rails or wheels (rubber-tired for outdoor use, steel wheels for rail-mounted).

Can be manual, electric, or hydraulic-powered.

Hoisting Mechanism

Equipped with an electric hoist (wire rope or chain hoist).

May include trolley movement along the girders for precise load positioning.

Applications

Factories & Workshops – Handling heavy machinery, steel coils, etc.

Shipyards & Ports – Loading/unloading cargo.

Power Plants – Moving large equipment like turbines.

Construction Sites – Erecting prefabricated structures.

 

Lifting Capacity: 5 metric tons

Span (Width): Typically 5m to 30m (customizable)

Lifting Height: 6m to 20m (adjustable)

Travel Speed: 10–30 m/min (adjustable)

Power Supply: 380V/50Hz (3-phase) or customized

Control: Pendant, remote, or cabin-operated

1. Main Structural Components

A. Gantry Beams (Bridge Girders)

Two parallel double girders (box-type or truss-type) that span the working area.

Made of high-strength steel for durability and load-bearing capacity.

Supports the trolley and hoist that move along the girders.

 

 

B. Legs (Support Columns)

Fixed or adjustable legs provide vertical support.

Can be A-frame, L-type, or U-type for stability.

Some models have height-adjustable legs for uneven terrain.

C. End Carriages (Travel Units)

Located at the base of each leg, allowing the crane to move along rails or ground.

Includes wheels, drive motors, and braking systems.

Rail-mounted: Steel wheels run on fixed tracks.

Rubber-tired: Equipped with heavy-duty tires for mobility on flat surfaces.

 

2. Lifting & Movement Components

A. Hoist & Trolley

Electric wire rope hoist (common for heavy loads) or chain hoist (for lighter loads).

Trolley assembly moves along the girders for horizontal load positioning.

May include variable speed control for precision lifting.

B. Crab Unit (Trolley Drive)

Motorized system that moves the trolley along the girders.

Includes gearbox, wheels, and brakes.

C. Travel Drive System

Motors & gearboxes for longitudinal movement (along rails/ground).

Rail-mounted: Uses steel wheels on tracks.

Rubber-tired: Uses pneumatic or solid rubber wheels with optional rail guidance.

3. Electrical & Control Systems

A. Power Supply

Cable reeling system (for rail-mounted cranes).

Diesel generator (for mobile rubber-tired gantries).

Festoon system (for power supply to the trolley).

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B. Control System

Pendant control (wired remote) for manual operation.

Radio remote control for wireless operation.

Frequency inverter for smooth acceleration/deceleration.

C. Safety Devices

Limit switches (to prevent over-travel).

Anti-collision system (for multiple cranes).

Anemometer & windproof brakes (for outdoor wind resistance).

Overload protection (load limiter).

4. Additional Features for Outdoor Use

A. Weatherproofing

Corrosion-resistant paint (epoxy coating).

Stainless steel components in coastal/salty environments.

Covered electrical panels (IP65 rating for dust/water resistance).

B. Rail System (If Rail-Mounted)

Fixed rails embedded in concrete.

Rail clamps to prevent movement in high winds.

C. Outriggers/Stabilizers (For Rubber-Tired)

Extendable supports for added stability during lifting.

SKETCH

Main technical

 

1. High Load Capacity & Durability

Handles 20 to 500+ tons, making them ideal for heavy industries like steel, shipbuilding, and construction.

Double-girder design provides better structural integrity than single-girder cranes.

Made from weather-resistant steel with anti-corrosion coatings for long-term outdoor use.

2. Wide Span & Customizable Height

Span ranges from 10m to 50m+, covering large work areas.

Adjustable lifting height (up to 30m or more) for tall structures like wind turbines or ship hulls.

3. Mobility & Flexibility

Rail-mounted for precise movement on fixed tracks (ideal for shipyards, steel plants).

Rubber-tired (RTG) for mobile applications (ports, construction sites).

Some models feature crawler tracks for rough terrain.

4. Enhanced Safety Features

Anti-sway technology for stable load control.

Wind-resistant design (brakes, anemometers for storm conditions).

Overload protection & limit switches to prevent accidents.

5. Low Maintenance & Long Service Life

Sealed bearings & corrosion-resistant parts reduce wear.

Modular design allows easy component replacement.

6. Energy Efficiency (Electric & Hybrid Options)

Electric rail-mounted cranes use regenerative braking.

Diesel-electric hybrid RTGs save fuel in ports.

 

1. Ports & Container Terminals

Rubber-tired gantry (RTG) cranes for stacking and moving shipping containers.

Rail-mounted gantry (RMG) cranes for intermodal freight yards.

2. Shipbuilding & Repair Yards

Lifting ship engines, hull sections, and heavy machinery (up to 500+ tons).

Used in dry docks for vessel assembly.

3. Steel & Metal Industries

Handling steel coils, slabs, and beams in rolling mills.

Loading/unloading heavy metal castings in foundries.

4. Power Plants & Heavy Machinery

Installing turbines, generators, and transformers.

Maintenance of hydroelectric and nuclear plants.

5. Wind Energy Sector

Assembling wind turbine blades and towers.

Used in onshore & offshore wind farm construction.

6. Construction & Precast Concrete

Moving precast concrete segments for bridges and buildings.

Erecting heavy structural steel frameworks.

7. Mining & Heavy Logistics

Transporting large mining equipment (crushers, excavators).

Used in open-pit mines and bulk material handling.

 

 

1. Design and Planning

Demand Analysis: According to customer needs and usage scenarios, a detailed demand analysis is carried out to determine the specifications, load, span, lifting height, etc. of the crane.

Engineering Design: Engineers use CAD and other design software to carry out detailed design, including structural, mechanical, electrical and other aspects to ensure that the design meets relevant standards and specifications.

2. Material Procurement

Material Selection: Select appropriate steel, motors, control systems and other components according to design requirements.

Supplier Screening: Screen suppliers of materials and components to ensure the quality and reliability of materials.

3. Processing and Manufacturing

Cutting and Forming: Cut, weld, bend and other processes on steel to form main beams, end beams and other structural components.

Machining: Precision machining of key components, such as turning, milling, drilling, etc., to ensure that the size and accuracy meet the design requirements.

Surface Treatment: Spray, galvanize or rust-proof metal parts to enhance corrosion resistance and aesthetics.

4. Assembly

Component Assembly: Assemble the main beam, end beam, trolley, lifting mechanism and other components to form a complete crane structure.

Installation of electrical system: Install electrical equipment such as motors, control cabinets, sensors, limit switches, etc. to ensure the normal operation of the electrical system.

5. Debugging and testing

Preliminary debugging: Carry out preliminary debugging of the crane to check the coordination and operation of each component.

Load test: Carry out load test to ensure the safety and stability of the crane under rated load, and test the functions of safety devices such as overload protection and limit switches.

Performance test: Test the performance indicators of the crane such as lifting speed, running speed, braking effect, etc. to ensure that they meet the design requirements.

6. Quality inspection

Quality inspection: Carry out a comprehensive quality inspection of the crane, including appearance, size, performance, etc., to ensure compliance with relevant standards.

Safety assessment: Carry out safety assessment to ensure the normal operation of all safety devices and systems.

7. Delivery and installation

Packaging and transportation: Pack qualified cranes and prepare them for transportation to the customer site.

On-site installation: Carry out on-site installation according to customer requirements, including basic production and equipment debugging.

Training and handover: Train operators to ensure that they master the operation methods and safety precautions of the equipment and complete the handover work.

 

 

 

 

 

 

 

Material Inspection

Quality Inspection: Strict quality inspection is carried out on the purchased raw materials to ensure that they meet the design requirements and national standards.

Material Storage: Qualified materials are stored according to classification to prevent corrosion or damage.

Cutting and Forming

Steel Cutting: Use plasma cutting, laser cutting or flame cutting and other technologies to cut the steel according to the size of the design drawing.

Forming Processing: Form the steel plate through bending, rolling, welding and other processes to manufacture the main beam, end beam and other structural parts.

Welding

Component Welding: The cut and formed steel parts are welded into the main structures such as the main beam, end beam and trolley. The welding process needs to be strictly controlled to ensure the structural strength and welding quality.

Weld Inspection: Use non-destructive testing technology (such as ultrasonic testing, radiographic testing) to inspect the welds to ensure that there are no cracks or other defects.

Machining

Precision Machining: Precision machining is performed on the key components of the crane, such as wheel sets, bearing seats, pulleys, etc., to ensure their dimensional accuracy and surface quality.

Assembly of the whole machine

General assembly: On the basis of pre-assembly, the overall assembly of the crane is carried out, including the final installation of the main beam, end beam, lifting mechanism, walking mechanism, etc.

Commissioning and testing

Under dynamic conditions, the operating performance of the crane is tested, including the testing of lifting, walking, steering and other functions. The overall size of the assembled bridge crane is checked to ensure that all dimensions meet the design requirements.

Spraying and anti-corrosion treatment

Surface treatment Rust removal: Rust removal on the surface of the crane, common methods include sandblasting, pickling, etc. Primer spraying: Spray anti-corrosion primer on the treated surface to prevent metal oxidation and corrosion. Topcoat spraying Color spraying: Spray topcoat according to customer requirements or industry standards to give the crane a protective and decorative effect. Marking: After spraying, mark the crane's identification information in accordance with the specifications, such as model, rated load, etc.

Factory and installation

Packaging and transportation

Packaging protection: Protectively package the key components of the crane to prevent damage during transportation. Transportation arrangement: According to the equipment size and transportation conditions, select a suitable transportation method to transport the crane to the customer's site.

Acceptance and delivery

Customer acceptance

On-site acceptance: The customer conducts on-site acceptance of the crane according to the contract requirements and technical specifications to check the performance and quality of the equipment.

Problem rectification: If any problems are found, the manufacturer needs to rectify them in time to ensure that the equipment fully meets the customer's requirements. Delivery and use Operation training: The manufacturer usually trains the customer's operators to ensure that they can operate the crane correctly and safely.

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