Rtg Rubber Tyred Mobile Gantry Crane

Key Features of RTG Cranes:

Rubber-Tyred Mobility

Runs on rubber tires (often with multiple axles for stability).

Can be diesel-powered, electric (with cable reel or battery), or hybrid.

Gantry Structure

Features a high-spanning gantry frame that allows it to straddle containers, trucks, or cargo.

Lifting mechanism (spreader/hook) moves along the gantry beam.

Applications

Container Handling: Commonly used in ports and intermodal yards for stacking and moving shipping containers.

Heavy Industry: Used in steel plants, construction sites, and large warehouses.

Logistics & Warehousing: For loading/unloading heavy cargo.

Advantages Over RMGs

Flexibility: Can be repositioned without fixed rails.

Cost-Effective: Lower infrastructure requirements compared to rail-mounted systems.

Maneuverability: Can operate in tighter spaces with proper steering systems.

Disadvantages

Requires a well-paved surface for smooth operation.

May need outriggers or stabilizers for heavy lifts.

Higher maintenance for tires compared to rail systems.

 

Comparison with Other Gantry Cranes

Feature	RTG	RMG (Rail-Mounted)	Overhead Crane
Mobility	High (rubber tires)	Limited (fixed rails)	Limited (fixed runway)
Infrastructure Cost	Low (no rails)	High (requires tracks)	Medium (needs support beams)
Flexibility	Can relocate easily	Fixed to rails	Fixed to building structure
Outdoor Use	Yes	Yes	Rarely
Automation Potential	Yes (AS-RTG)	Yes (ARMG)	Limited

 

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

 

A Rubber-Tyred Mobile Gantry Crane (RTG) consists of several key structural, mechanical, and electrical components that enable its mobility, lifting capacity, and operational efficiency. Below is a breakdown of its major components:

 

1. Structural Components

A. Gantry Frame

Main Gantry Beams – The primary horizontal beams that span the working area, supporting the trolley and hoist.

Legs (Supports) – Vertical columns that provide height and stability to the crane.

Cross Beams & Bracing – Reinforcements to ensure rigidity and prevent swaying.

 

B. Boom (Optional)

Some RTGs have an extendable or luffing boom for additional reach.

C. Spreader (For Container Handling)

A specialized lifting attachment (twistlock mechanism) for securing and moving shipping containers.

 

2. Mobility & Chassis Components

A. Rubber-Tyred Undercarriage

Wheels & Tires – Heavy-duty pneumatic or solid rubber tires for smooth movement.

Axles & Suspension – Multiple axles (typically 4–16 wheels) distribute load and improve stability.

Steering System – Hydraulic or electronic steering for maneuverability (crab, 90°, or coordinated steering).

 

B. Drive System

Diesel Engine (for diesel-powered RTGs) or Electric Motors (for E-RTGs).

Transmission & Gearboxes – Transfer power to the wheels.

Braking System – Disc or drum brakes with anti-slip control.

C. Outriggers/Stabilizers (Optional)

Extendable supports to enhance stability during lifting operations.

3. Lifting & Hoisting Mechanism

A. Hoist Unit

Electric or Hydraulic Hoist – Provides vertical lifting power.

Wire Rope & Sheaves – For lifting and lowering loads.

Hook Block or Spreader – The load-handling device.

B. Trolley System

Moves horizontally along the gantry beam to position the load.

Trolley Frame & Wheels – Guided by rails on the gantry beam.

Drive Motors – Electric or hydraulic motors for trolley movement.

 

 

4. Power & Control Systems

A. Power Source

Diesel Generator (for conventional RTGs).

Electric Power (E-RTG) – From a cable reel, conductor bar, or battery.

Hybrid Systems – Combine diesel and electric power.

B. Control Cabin

Operator cabin with joysticks, touchscreens, and safety controls.

May include remote control or automated operation (semi/full-auto RTGs).

C. Electrical & Hydraulic Systems

PLC (Programmable Logic Controller) – Manages crane operations.

Sensors & Limit Switches – Prevent overloading and collisions.

Hydraulic Pumps & Cylinders – For steering, braking, and stabilizers.

 

5. Safety & Auxiliary Components

A. Safety Devices

Anti-Collision System – Laser or radar-based to avoid obstacles.

Load Moment Indicator (LMI) – Prevents overloading.

Emergency Stop & Anti-Sway System – Ensures safe operation.

B. Lighting & Warning Systems

LED Work Lights – For night operations.

Horns & Alarms – Alert workers during movement.

C. Anchoring System (Optional)

Used in high-wind conditions to secure the crane.

 

6. Optional Advanced Features

Automated Stacking (AS-RTG) – GPS-guided positioning.

Regenerative Braking – Recovers energy in electric models.

Tire Pressure Monitoring – Ensures optimal tire performance.

SKETCH

 

Main technical

 

1. High Mobility & Flexibility

No fixed rails required (unlike Rail-Mounted Gantry Cranes – RMGs).

Can be easily repositioned for different work areas.

Suitable for temporary worksites where permanent infrastructure is not available.

2. Versatile Applications

Can handle containers, heavy machinery, steel coils, and bulk cargo.

Used in ports, intermodal yards, construction sites, and warehouses.

3. Cost-Effective Operation

Lower infrastructure costs compared to RMGs (no need for rail tracks).

Diesel, electric, or hybrid power options for different budgets and environmental needs.

4. High Efficiency & Productivity

Fast movement between stacking lanes.

Automated options (AS-RTGs) for optimized container handling.

5. Adaptability to Different Environments

Can operate outdoors (unlike overhead cranes).

Some models have all-terrain capabilities for rough surfaces.

6. Better Space Utilization

Can stack containers 4–6 high, maximizing yard space.

Adjustable span width to fit different working areas.

7. Reduced Downtime

No rail maintenance (unlike RMGs).

Modular design allows for quick repairs.

1. Ports & Container Terminals

Stacking and moving shipping containers in storage yards.

Loading/unloading from trucks and rail cars.

Intermodal operations (transfer between ships, trucks, and trains).

2. Logistics & Freight Yards

Warehouse cargo handling for heavy materials.

Cross-docking operations (transferring goods between transport modes).

3. Industrial & Manufacturing Plants

Steel plants (handling coils, plates, and heavy machinery).

Construction material yards (precast concrete, pipes, beams).

4. Heavy Equipment Handling

Power plants (moving turbines and generators).

Shipbuilding yards (positioning large components).

5. Temporary & Project-Based Sites

Construction projects (bridge building, large-scale assembly).

Disaster recovery (lifting debris and heavy materials).

 

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%.