High Performance Double Girder Gantry Crane

A double girder gantry crane is a heavy-duty lifting machine where the crane bridge is supported by legs running on ground-level rails or wheels, allowing it to operate outdoors or in large open spaces. The high performance version is engineered for enhanced load capacity, precision, durability, and advanced control.

 

Core Components：Engine, Bearing, Gearbox, Motor, Gear

Place of Origin：Henan, China

Warranty：2 years

Weight (KG)：50000 kg

Video outgoing-inspection：Provided

Machinery Test Report：Provided

Application：Outdoor

Keywords：Gantry Crane

Rated Loading Capacity：50Ton

Cross travelling speed：44.6m/min

Long travelling speed：47.1m/min

Control way：cabin

Power supply：Cable reel

Steel track：QU80

Power：3-phase AC 50HZ 380V

 

 

1.Main beam

Structure Type:
Welded box girder or European-style girder with high torsional rigidity.

Material:
High-strength structural steel such as Q345B or equivalent, ensuring durability and strength.

Manufacturing Process:

Steel plates are cut by CNC laser or plasma cutting machines for precision.

Plates are assembled and welded using full-penetration submerged arc welding (SAW) to ensure strong, fatigue-resistant joints.

The girder undergoes stress relief and non-destructive testing (NDT) such as ultrasonic or magnetic particle inspection to detect defects.

2.Lifting System

The lifting system is the core mechanism that handles the vertical lifting and lowering of loads. In a high-performance double girder gantry crane, the lifting system is designed for heavy capacity, smooth operation, and precise load control under demanding industrial conditions.

3.End carriage

Material:
High-quality structural steel (typically Q235B or Q345B) with welded box-type or lattice-frame construction for strength and rigidity.

Construction:
Fabricated from welded steel plates and sections, designed to withstand dynamic loads, torsion, and bending stresses.

4.Crane travelling mechanism

The crane traveling mechanism enables the entire gantry crane to move longitudinally along the ground rails, allowing it to cover the working area. In a high-performance double girder gantry crane, this mechanism is designed for smooth, reliable, and controlled movement under heavy loads and frequent operation.

5.Trolley travelling mechanism

The trolley traveling mechanism allows the trolley (which carries the hoist) to move horizontally along the length of the double girders. This mechanism is crucial for positioning the load precisely and efficiently over the work area.

7.Crane Hook

The hook is a vital lifting component that connects the load to the hoisting mechanism. In high-performance double girder gantry cranes, the hook assembly is designed to ensure maximum strength, safety, and reliability for heavy-duty lifting tasks.

8.Motor

The motor is a critical component that powers the crane's movements-lifting, trolley traveling, and crane traveling. In high-performance double girder gantry cranes, motors are designed to deliver high torque, smooth operation, and durability under heavy industrial use.

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9.Sound and light alarm system & limit switch

Sound and Light Alarm System
The sound and light alarm system is crucial for alerting nearby personnel of crane movements and operational status, enhancing workplace safety.
Limit Switches
Limit switches are safety devices designed to prevent crane components from exceeding safe travel or lifting limits.

10.Safety Devices

Overload Protection Device:Prevents lifting loads exceeding the crane's rated capacity by monitoring load weight and cutting power or alerting operator.
Limit Switches:Stops crane or trolley travel and hoisting at predefined safety boundaries (upper/lower hoist, trolley and crane travel limits).
Emergency Stop (E-Stop):Instantly stops all crane operations when activated, located on pendant, cabin, and remote controls for quick access.
Anti-Collision System：Uses sensors (radar, ultrasonic, laser) to detect obstacles or other cranes and automatically slows or stops movement to avoid collisions.
Slack Rope Detector：Detects slack in the hoist wire rope to prevent entanglement or sudden load drops.
Brake Monitoring System：Ensures brakes are functioning correctly and alerts for maintenance if wear or failure is detected.

11.Control Mode

The control mode defines how operators command the crane's movements - including lifting, trolley traveling, and crane traveling. High-performance double girder gantry cranes offer flexible control options to optimize safety, precision, and efficiency in various working environments.

12.Sketch

 

Main technical

 

 

1.High Load Capacity

The double girder structure supports very heavy loads, often from 5 tons up to 500+ tons, ideal for demanding industrial lifting.

2.Wide Span and Large Working Area

Suitable for long spans (often 30–50 meters or more), enabling coverage of wide outdoor yards or large factory spaces.

3.Enhanced Structural Rigidity and Stability

Box-type or European-style girders reduce deflection and sway, ensuring stable, precise operation even with heavy or awkward loads.

4.Durable and Robust Construction

Heavy-duty steel construction and quality welding ensure long service life in harsh environments like ports, steel mills, and shipyards.

5.Versatile Control Options

Supports pendant, wireless remote, cabin, semi-automatic, and fully automated control modes to match various operational needs.

6.Advanced Safety Features

Equipped with overload protection, limit switches, emergency stops, anti-collision systems, and alarms for safe operation.

7.Smooth and Precise Operation

Variable Frequency Drives (VFDs) enable fine speed control, smooth starting/stopping, and reduced load swing.

 

Steel Industry:Handling steel coils, slabs, billets, plates in yards and fabrication shops.
Shipbuilding:Lifting and assembling large ship sections and heavy equipment.
Ports and Containe:Yards Loading/unloading containers, heavy cargo handling.
Construction:Moving large precast concrete elements, steel beams, and materials.
Heavy Machinery Manufacturing:Transporting and assembling heavy machinery parts and large components.
Power Plants:Maintenance and installation of turbines, transformers, and generators.

 

1. Design & Engineering
Requirement Analysis: Gather client specifications-capacity, span, working environment, control preferences.

Structural & Mechanical Design: Use CAD and FEM software to design main girders, end carriages, trolley, hoist, and control systems.

Component Selection: Choose motors, gearboxes, electrical parts, and safety devices.

Client Approval: Finalize and approve design drawings and technical specs.

2. Material Procurement
Purchase high-quality steel plates and profiles (e.g., Q345B).

Source electrical components from certified suppliers.

Inspect all incoming materials for quality and standards compliance.

3. Fabrication
Cutting: CNC laser/plasma cutting of steel plates.

Welding: Full-penetration submerged arc welding (SAW) for main girders and structural parts.

Machining: Precision machining of connection points, wheel hubs, shafts, and hoist parts.

Assembly: Pre-assembly of subcomponents like end carriages and trolley frames.

4. Surface Treatment
Cleaning: Sandblasting to remove rust and scale.

Coating: Primer, epoxy, and polyurethane topcoat applied for corrosion resistance.

Inspection: Coating thickness and adhesion tested according to standards.

5. Electrical & Control System Installation
Install wiring, control panels, motors, limit switches, and alarms.

Integrate PLC, VFDs, and human-machine interfaces.

Test electrical continuity, safety circuits, and control functions.

6. Final Assembly
Assemble main girders onto end carriages.

Mount trolley, hoist, and control systems.

Install hooks, wire ropes, and safety devices.

7. Testing & Quality Assurance
No-Load Tests: Verify movement and control of crane, trolley, and hoist without load.

Load Tests: Perform rated load and overload tests to confirm lifting capacity and safety systems.

Functional Tests: Check limit switches, alarms, brakes, emergency stops, and safety interlocks.

Alignment & Calibration: Ensure smooth travel and precise load positioning.

8. Packing & Delivery
Disassemble as necessary for transport.

Protect components with corrosion inhibitors and secure packaging.

Arrange shipment to customer site.

9. Installation & Commissioning (On-Site)
Assemble crane on runway beams or rails.

Connect power and control systems.

Perform final commissioning tests and operator training.

10. After-Sales Support
Provide maintenance manuals and spare parts.

Offer technical support, periodic inspections, and preventive maintenance services.

1. Design & Engineering
Customer requirements gathered (load capacity, span, lifting height, environment).

Structural, mechanical, and electrical design using CAD and FEM analysis.

Preparation of technical drawings and production plans.

Material selection and procurement planning.

2. Material Preparation
Steel plates, profiles, and sections cut to size by CNC machines.

Quality inspection of raw materials (chemical composition, mechanical properties).

3. Fabrication of Main Components
Main Beams: Welding of box girders or H-beams, including reinforcement.

Gantry Legs & End Carriages: Steel fabrication and assembly.

Trolley Frames & Hoist Parts: Machining and welding.

4. Surface Treatment
Sandblasting to remove rust and impurities.

Application of primer and anti-corrosion paint coats.

Curing and drying under controlled conditions.

5. Assembly of Mechanical Parts
Installation of rails on main beams.

Mounting of wheels, motors, gearboxes on end carriages and trolley.

Assembling of hoisting mechanism (drum, wire rope, hook block).

6. Electrical System Installation
Wiring of control panels, motors, limit switches, alarms, and sensors.

Integration of control modes (pendant, remote, cabin).

Testing of electrical components and safety devices.

7. Quality Control & Testing
Dimensional inspection and alignment check.

Load testing (static and dynamic) to verify lifting capacity.

Functional testing of all motions: hoisting, trolley travel, crane travel.

Safety system verification (alarms, limit switches, brakes).

8. Packaging & Delivery
Disassembly of components if required for shipment.

Protective packaging to prevent damage during transport.

Loading and dispatch to customer site.

9. On-site Installation & Commissioning
Assembly of crane structure on site.

Alignment and rail installation.

Electrical connection and system calibration.

Final load testing and operator training.

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%.