Electric Double Beam Gantry Crane

Key Features:

Double Girder Design

Provides higher lifting capacity (typically 5 to 550 tons) compared to single-beam gantry cranes.

Offers better stability and reduced deflection under heavy loads.

Electric Hoist or Trolley System

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

The trolley moves horizontally along the girders for precise load positioning.

Gantry Structure

Supported by rigid legs (fixed or adjustable height).

Can be semi-gantry (one side supported by a building column) or full gantry (self-supported on both sides).

Mobility Options

Rail-mounted: Moves on embedded tracks for heavy-duty applications.

Wheel-mounted (rubber-tired): Portable for outdoor or temporary use.

Control Systems

Pendant control (wired handheld remote).

Radio remote control for flexible operation.

Cabin-operated for high-precision tasks.

Customizable Configurations

Span length (typically 10–35 meters, extendable).

Lifting height (adjustable based on requirements).

Weatherproof or explosion-proof variants for harsh environments.

 

Comparison with Single Beam Gantry Crane:

Feature	Double Beam	Single Beam
Load Capacity	Higher (up to 550T)	Lower (up to 20T)
Span	Wider (suitable for large areas)	Smaller spans
Stability	More rigid, less deflection	Less rigid
Cost	Higher initial investment	More economical

 

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

 

An Electric Double Beam Gantry Crane consists of several key components that work together to ensure efficient and safe lifting operations. Below is a detailed breakdown of its major parts:

 

1. Main Girders (Bridge Beams)

Function: Primary load-bearing structure that spans the working area.

Design: Two parallel steel box girders or I-beams for high strength and rigidity.

Features:

Reinforced to minimize deflection under heavy loads.

May include walkways for maintenance (in larger cranes).

2. End Carriages (Legs & Wheels)

Function: Supports the girders and enables movement along the runway rails.

Components:

Legs: Vertical structures (fixed or adjustable height).

Wheels & Buffers:

Rail-mounted: Steel wheels for track movement.

Rubber-tired: Mobile cranes without rails.

Buffers: Shock absorbers to prevent collisions.

Drive Mechanism: Electric motors for gantry travel (may be single or dual drive).

 

3. Hoist & Trolley System

Function: Handles vertical lifting and horizontal movement of loads.

Components:

Electric Hoist:

Wire rope hoist (for heavy loads).

Chain hoist (for lighter, precise lifting).

Trolley Frame: Moves along the girders via motorized wheels.

Lifting Hook/Grab: Attaches to the load (can be customized for special applications).

 

4. Runway System

Function: Provides the path for gantry movement.

Types:

Embedded Rails: Fixed tracks for heavy-duty applications.

Surface-Mounted Rails: Easier to install, used in workshops.

Rubber-Tired (No Rails): For mobile gantry cranes.

 

5. Electrical & Control Systems

Components:

Motors:

Hoist motor (for lifting).

Trolley motor (for cross-travel).

Gantry travel motors (for longitudinal movement).

Control Panel: Houses contactors, relays, and overload protectors.

Operator Controls:

Pendant Control: Wired handheld remote.

Radio Remote: Wireless operation.

Operator Cabin: For high-precision or frequent use.

Safety Devices:

Limit switches (to prevent over-travel).

Overload protection (cuts power if capacity is exceeded).

Emergency stop (E-stop) button.

6. Braking System

Types:

Mechanical Brakes: Spring-loaded failsafe brakes.

Regenerative Braking: Recovers energy in modern cranes.

Function: Ensures smooth stopping and holds loads securely.

 

 

7. Miscellaneous Components

Cabin (Optional): Enclosed operator station for better visibility.

Lighting & Alarms: Warning signals for safe operation.

Anti-Sway System (Optional): Reduces load swing for precision lifting.

Festoon/Cable Reel: Manages power and control cables.

 

Key Considerations When Selecting Components:

Load Capacity & Span: Determines girder size and motor power.

Duty Cycle: Frequent use requires heavy-duty motors and brakes.

Environment: Corrosive or explosive areas need special coatings/fixtures.

Power Supply: Typically 3-phase AC (380V, 480V, etc.).

SKETCH

 

Main technical

 

Electric Double Beam Gantry Cranes are widely used in heavy industries due to their superior strength, stability, and versatility. Here are the key advantages:

1. High Load Capacity (Up to 550+ Tons)

Designed for heavy-duty lifting, making them ideal for steel plants, shipyards, and construction.

More rigid than single-beam cranes, reducing deflection under extreme loads.

2. Wider Span Coverage (10–35+ Meters)

Suitable for large workspaces like warehouses, ports, and manufacturing halls.

Can be customized for extra-wide spans with reinforced girders.

3. Enhanced Stability & Durability

Double girders distribute weight evenly, minimizing sway and vibration.

Robust steel construction ensures long-term performance in harsh environments.

4. Greater Lifting Height

Accommodates taller loads compared to single-beam cranes.

Adjustable girder height for specialized applications.

5. Precise & Smooth Operation

Equipped with variable-speed controls for accurate load positioning.

Anti-sway technology available for delicate operations.

6. Flexible Mobility Options

Rail-mounted: Best for fixed indoor/outdoor installations.

Rubber-tired: Portable for temporary job sites.

7. Safety Features

Overload protection, limit switches, emergency brakes, and fail-safe locking.

Optional cabin or remote control for operator safety.

8. Low Maintenance & Long Service Life

High-quality components reduce wear and tear.

Easy access for inspections and repairs.

These cranes are essential in industries requiring heavy lifting, precision handling, and wide coverage. Common applications include:

1. Steel & Metal Industry

Handling steel coils, plates, and castings.

Loading/unloading in rolling mills and foundries.

2. Shipbuilding & Ports

Assembling ship sections.

Moving containers and heavy cargo in docks.

3. Construction & Infrastructure

Lifting precast concrete beams and bridge segments.

Transporting heavy machinery on-site.

4. Power Plants

Installing turbines, generators, and transformers.

Maintenance of boilers and heavy equipment.

5. Railway & Aerospace

Assembling train carriages.

Handling aircraft components in hangars.

6. Mining & Heavy Machinery

Moving large mining equipment like crushers and excavators.

7. Warehousing & Logistics

Stacking heavy pallets in large storage facilities.

 

The production process of a 200-ton mobile boat/marine lift crane involves several stages, from design and engineering to fabrication, assembly, and testing. Below is a detailed breakdown of the typical production process:

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1. Design & Engineering

Conceptual Design: Engineers create initial sketches and 3D models based on load capacity (200 tons), reach, mobility, and environmental conditions (marine use).

Structural Analysis: Finite Element Analysis (FEA) ensures the crane can handle dynamic loads, wind, and wave forces.

Hydraulic & Electrical Systems: Design of hydraulic cylinders, winches, and control systems for smooth lifting operations.

Material Selection: High-strength steel (e.g., ASTM A514) for corrosion resistance in marine environments.

Regulatory Compliance: Meets standards like DNV-GL, ABS, or Lloyd's Register for marine cranes.

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2. Material Procurement

Steel Plates & Beams: Sourced for the boom, chassis, and structural framework.

Hydraulic Components: Pumps, cylinders, hoses, and valves from certified suppliers.

Electrical Systems: Motors, sensors, and control panels (often waterproof for marine use).

Wire Ropes & Sheaves: High-grade steel cables for lifting.

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3. Fabrication

A. Structural Fabrication

Cutting & Shaping: CNC plasma/laser cutting for precision parts.

Welding: Automated and manual welding (Submerged Arc Welding for thick sections).

Boom Construction: Lattice or telescopic design for strength and mobility.

Chassis & Outriggers: Reinforced for stability during lifts.

B. Hydraulic & Mechanical Assembly

Hydraulic System: Installation of pumps, cylinders, and hoses.

Winches & Drums: Mounted for lifting and lowering operations.

Slewing Mechanism: Allows 360° rotation (if applicable).

C. Electrical & Control Systems

Control Cabin: Waterproof operator station with joysticks/sensors.

Load Monitoring: Load cells and limit switches for safety.

Power Supply: Diesel engine or electric motor (marine-grade).

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4. Assembly & Integration

Boom Installation: Mounted onto the chassis with pivot points.

Counterweights: Added for balance (if required).

Final Wiring & Plumbing: Connecting hydraulic and electrical systems.

Painting & Coating: Anti-corrosion paint (epoxy or zinc coatings).

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5. Testing & Quality Control

Load Testing: Lifting 200 tons (+25% overload test, per standards).

Functional Tests: Checking hydraulic movements, rotation, and stability.

Environmental Tests: Salt spray tests for marine durability.

Safety Checks: Emergency stop systems, overload alarms.

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6. Delivery & Commissioning

Transport: Disassembled for shipping or delivered as a mobile unit.

On-Site Assembly: Reassembled at the dock or shipyard.

Operator Training: Handling and safety protocols.

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%.