Single-Girder Electric Rubber-Tired Gantry Crane

Key Features

Mobility

Equipped with rubber tires (often pneumatic or solid) for easy movement without fixed rails.

Suitable for outdoor/indoor use on flat surfaces like concrete or asphalt.

Lifting Mechanism

Single-girder design (lighter and more cost-effective than double-girder).

Electric hoist (e.g., 5-ton capacity) with dual-speed options (e.g., 5 m/min full load, 0.8 m/min precision).

Optional manual or motorized trolley for lateral movement.

Control & Safety

Pendant control or radio remote for operator flexibility.

Limit switches, overload protection, and anti-collision devices.

Schneider/KC electric components (common in premium models).

Power Supply

Standard: 380V/50Hz/3-phase AC (adjustable for regional standards).

Alternative: Diesel generator for remote locations.

Comparison with Alternatives

Case Studies & Innovations

Place of Origin:Henan, China

Warranty:2 years

Weight (KG):60000 kg

Video outgoing-inspection:Provided

Machinery Test Report:Provided

Application:warehouses,factory and other place

Crane type:box type gantry crane

Travelling speed:20m/min

Lifting mechanism:Electric Hoist

Control method:Ground Control+ Remote Control (customized)

Working duty:A5

Working Temperature:-20~+40℃

Industrial voltage:380V50HZ3Phanse or other

Color:Customised

Customization:Accepted

A Single-Girder Electric Rubber-Tired Gantry Crane (RTG) consists of several key components that work together to ensure safe and efficient lifting operations. Below is a detailed breakdown of its main parts:

1. Main Girder (Bridge Beam)
Function: The primary horizontal beam that supports the trolley and hoist.

Material: Typically made of welded steel (box-type construction for strength).

Design: Single-girder (lighter than double-girder, suitable for ≤20-ton loads).

2. End Trucks (Legs & Wheels)
Function: Support the girder and enable mobility via rubber tires.

Components:

Rubber Tires: Pneumatic (for shock absorption) or solid (for durability).

Wheels & Axles: 4–8 wheels with motorized travel drives.

Steering System: Manual or motorized (for directional control).

3. Electric Hoist
Function: Lifts and lowers loads vertically.

Types:

Wire Rope Hoist: Common for heavy-duty lifting (5-ton capacity).

Chain Hoist: Lighter and more compact.

Features:

Dual-speed lifting (e.g., 5 m/min full load, 0.8 m/min precision).

Overload protection and thermal safety switches.

4. Trolley
Function: Moves the hoist horizontally along the girder.

Types:

Manual Trolley: Hand-pushed (for light use).

Motorized Trolley: Electric-driven (for precise control).
 

5. Power & Control System
Components:

Electric Panel: Houses contactors, relays, and circuit breakers.

Control Methods:

Pendant Control: Wired handheld unit.

Radio Remote: Wireless operation (up to 100m range).

Power Supply: 380V/50Hz/3-phase AC (or regional equivalents).

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6. Safety Devices
Limit Switches: Prevent over-travel of hoist/trolley.

Anti-Collision System: Sensors for multi-crane environments.

Emergency Stop: Instantly cuts power.

Load Indicator: Displays real-time weight.

7. Miscellaneous Components
Bumpers: Rubber pads on end trucks to absorb impacts.

Lighting: LED work lights for night operations.

Outriggers: Optional stabilizers for added safety during lifts.

Sketch

Main technical

Advantages

Mobility & Flexibility

Unlike rail-mounted gantry cranes (RMG), RTGs can freely transfer between work areas due to rubber tires, making them ideal for dynamic environments like ports and warehouses.

No need for fixed tracks, reducing infrastructure costs.

Energy Efficiency (Electric Models)

Electric RTGs (E-RTGs) powered by grid electricity (e.g., via cable reels or sliding lines) consume significantly less energy (e.g., 1.8 kWh per container) compared to diesel-powered RTGs (2.2 liters of diesel per container).

Eliminates diesel emissions, reducing noise (4–5 dB lower) and pollution (zero smoke).

Cost-Effectiveness

Lower operational costs due to reduced fuel consumption and maintenance (no diesel engines).

Lightweight design (60% lighter than traditional RTGs) decreases ground pressure, cutting foundation construction costs.

Compact & Space-Saving

Single-girder designs are lighter and narrower than double-girder cranes, suitable for small to medium-sized workshops or stacked container yards.

Automation & Safety

Modern E-RTGs integrate automated power collection systems (e.g., sliding lines or quick-connect plugs), reducing manual intervention and improving safety.

Features like load limiters, anti-collision sensors, and remote controls enhance operational safety.

Ports & Container Terminals

Handling 20ft/40ft containers in stacking yards, with flexibility to move between zones.

Used in hybrid systems with RMGs for optimized energy use and mobility.

Warehouses & Logistics Centers

Transporting heavy machinery, steel coils, or bulk goods in indoor/outdoor storage areas.

Manufacturing & Workshops

Assembly line support, especially in automotive or aerospace industries requiring precise load positioning.

Construction Sites

Temporary lifting of prefabricated structures or materials, leveraging mobility for site adaptability.

Specialized Environments

Cold storage facilities: Electric RTGs avoid diesel exhaust issues.

Small-scale yards: Compact designs fit limited spaces.

1. Requirement Analysis & Technical Design
Client Consultation: Understand the customer's specific needs (load capacity, span, lifting height, working environment, control system, safety features).
Site Assessment: Evaluate the installation site, environmental conditions, and any special constraints.
Engineering Design:
Develop detailed 3D CAD drawings and structural calculations for the girder, end carriages, trolley, hoist, and electric systems.
Customize components such as motors, brakes, control panels, and safety devices based on project specifications.
Ensure compliance with international standards (ISO, FEM, CMAA, etc.).
2. Material Procurement
Steel Structure Materials: Source high-quality steel plates, beams, and profiles (Q235B/Q355B or equivalent) for the girder and frame.
Electrical & Mechanical Components: Purchase motors, gearboxes, brakes, hoists, control panels, limit switches, cables, and other electrical components from approved suppliers.
Specialty Items: Order additional customized parts (e.g., explosion-proof motors, stainless steel components, or corrosion-resistant finishes if needed).
3. Steel Structure Fabrication
Cutting: Use CNC cutting machines or laser cutters to process steel plates and profiles according to design specifications.
Beveling: Perform edge preparation for welding using beveling machines.
Welding:
Weld the main girder, end carriages, and other structural components according to certified welding procedures.
Conduct weld inspections (visual inspection, ultrasonic or X-ray testing if required).
Straightening: Use hydraulic presses to ensure the girder and frame are straight and dimensionally accurate.
Machining: Machine key connection points (e.g., wheel bases, trolley rails) for precise assembly.
4. Surface Treatment
Sandblasting/Shot Blasting: Remove rust, scale, and surface impurities from the steel structure to achieve SA2.5 or better surface grade.
Painting/Coating:
Apply primer and finishing coats based on the environmental working conditions (e.g., marine-grade paint for outdoor cranes).
Optional: Apply anti-corrosion, anti-static, or explosion-proof coatings depending on the client's requirements.
5. Component Assembly
Hoist & Trolley Assembly:
Assemble the electric hoist and trolley system, including motors, gear reducers, wire ropes or chains, and hook blocks.
Pre-install limit switches, brakes, and cable reels.
End Carriage Assembly:
Install traveling wheels, bearings, buffers, and drives onto the end carriages.
Electrical Wiring:
Pre-wire key components (e.g., hoist motor, trolley motor) in accordance with the electrical layout.
Install control systems, power supply cables, festoon systems, or cable carriers.
6. Pre-Assembly & Trial Fitting
Pre-assemble the girder, end carriages, hoist, trolley, and electrical system at the factory to ensure proper fit and alignment.
Conduct tolerance checks on critical dimensions (e.g., span, wheelbase, and diagonal measurements).
7. Factory Testing (Pre-Delivery Inspection)
Mechanical Testing: Perform no-load and partial-load tests on hoisting, trolley travel, and crane travel systems to verify smooth and reliable operation.
Electrical Testing: Verify proper functioning of motors, control panels, limit switches, alarms, and safety devices.
Safety Inspection:
Overload protection testing.
Emergency stop and brake system verification.
Check for proper function of sound and light alarms.
Note: A third-party inspection can be arranged if required by the client.
8. Disassembly & Packaging
Disassemble major components (girder, trolley, hoist, end carriages) for transport.
Protect all surfaces with anti-corrosion oil or protective wraps.
Use reinforced wooden crates or steel frames for sensitive components like motors, control systems, and electrical parts.
9. Delivery & Logistics
Organize transportation (by truck, rail, or sea) to the customer's site.
Provide detailed installation manuals, electrical diagrams, and operation guides along with the shipment.

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%.