China Double Girder Gantry Crane Supplier

As a leading double girder gantry crane supplier in China, we specialize in the design, manufacturing, and global supply of high-performance lifting equipment tailored to meet the most demanding industrial requirements. With decades of experience, advanced production facilities, and a strong engineering team, we provide reliable, cost-effective solutions for customers worldwide.

Who We Are

We are a certified manufacturer and exporter of gantry cranes, overhead cranes, and customized lifting solutions, serving clients in steel manufacturing, shipbuilding, logistics, construction, power generation, and other heavy industries. Our cranes are designed in compliance with ISO, CE, FEM, and GB standards, ensuring global quality assurance.

Our Product Focus: Double Girder Gantry Cranes

Our Double Girder Gantry Cranes are engineered for heavy-duty lifting, offering:

Load capacities from 5 tons to 300+ tons

Customized spans, lifting heights, and duty classes

Precision control systems including VFDs and remote operation

Robust construction suitable for both indoor and outdoor environments

Optional features like anti-sway systems, automation, and explosion-proof components

Why Choose Us?

✅ Advanced Manufacturing Facilities – CNC machining, robotic welding, and high-precision assembly

✅ Strong R&D Team – Custom design capabilities for unique project requirements

✅ Reliable Quality Control – 100% load testing and international certifications

✅ Competitive Pricing – Direct factory sales with no middlemen

✅ Global Service – Fast delivery, technical support, and after-sales services in over 60 countries

Industries We Serve

Steel mills and foundries

Ports and shipyards

Container yards

Heavy equipment manufacturing

Infrastructure and civil engineering

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.Double Main Girders

Function: The primary load-bearing beams that support the trolley and hoist system.

Structure: Welded box or H-beam type, made from high-strength steel.

Customization: Designed to meet specific span and load capacity requirements.

Hoisting Trolley (or Open Winch System)

Function: Lifts and lowers the load while traveling horizontally along the girders.

Includes:

Electric hoist or winch

Drum, wire rope, and hook block

Trolley frame and travel mechanism

3.End Carriages (Legs & Wheels)

Function: Support the crane and allow movement along the ground rail.

Structure: Rigid welded steel legs (A-type or U-type design), with bolted or welded connections to the girders.

Travel System: Equipped with motorized wheels (rubber or steel) powered by motors and gearboxes.

4.Crane Driving Mechanism

Function: Moves the crane along the rails.

System:

Motors and gearboxes (SEW, Siemens, or China-made brands)

Soft start or VFD for smooth acceleration

Travel limiters and safety bumpers

5.Trolley travelling mechanism

(1) Drive System (Motor & Gearbox Assembly)
High-performance motor: Typically uses a three-phase asynchronous motor for stable power.
Gearbox with hardened gears: Provides smooth and efficient torque transmission.
Variable Frequency Drive (VFD) optional: Enables soft start, adjustable speed control, and energy savings.
(2) Wheel System
High-strength forged steel wheels (65Mn, 42CrMo) for wear resistance and long service life.
Mounted on precision bearings to reduce friction and ensure smooth rolling motion.
Runs on machined rail tracks fixed on the main beams.
(3) Rail & Guidance System
Moves on steel rails mounted on the double girders.
Equipped with guide rollers to maintain straight movement.
Anti-skew detection system for accurate positioning.
(4) Braking System
Electromagnetic or hydraulic brakes ensure instant stopping when needed.
Emergency braking system prevents uncontrolled movement in case of failure.
Automatic brake holding function when the motor is off.
(5) Safety Features
Overload protection to prevent excessive weight stress.
Travel limit switches to stop movement at pre-set points.
Anti-collision sensors to avoid crashes with end stops.
Speed control system for precise and safe movement.

6.Crane wheel

1)Overview
The crane wheels of a double girder steel gantry crane are essential components that support and guide the movement of the crane along the rails. These wheels are designed to withstand heavy loads, high impact forces, and continuous operation, ensuring smooth and stable crane travel.
2)Types of Crane Wheels
Single-Flange Wheels – Used for guided rail systems to prevent derailment.
Double-Flange Wheels – Provides extra stability, commonly used in outdoor gantry cranes.
No-Flange Wheels – Used with guiding rollers or special track designs.

7.Crane Hook

1)Types of Crane Hooks
Single Hook – Suitable for light to medium loads (5T–50T), offering simple operation and flexibility.
Double Hook – Used for heavy-duty lifting (50T–500T), providing better load balance and stability.
C-Type Hook – Designed for coils or rolls, ensuring secure handling of specialized loads.
Rotating Hook (Swivel Hook) – Equipped with 360° rotation, allowing for precise load positioning.
2)Material & Manufacturing Process
Forged Carbon Steel (20Mn, 34CrMo4, 42CrMo) for high strength and durability.
Heat Treatment:
Quenching & tempering to increase hardness and impact resistance.
Surface hardening (HRC 35-45) for wear resistance.
Load Testing: Hooks are tested with 125% to 150% of rated load capacity to ensure safety.

8.Motor

Types of Motors
(1) Hoisting Motor
Type: Asynchronous AC motor
Purpose: Drives the hoisting mechanism, responsible for lifting and lowering loads.
Power Rating: Typically ranges from 2.2kW to 200kW, depending on crane capacity.
Features:
High torque for heavy lifting.
Variable speed control for smooth load handling.
Built-in overload protection for safety.
(2) Trolley Traveling Motor
Type: Asynchronous AC motor or DC motor (depending on crane type)
Purpose: Drives the movement of the trolley along the girder.
Power Rating: Usually between 1.5kW to 50kW.
Features:
Smooth acceleration and deceleration.
Regulated speed control (with variable frequency drive, VFD).
Compact design to fit within the crane's trolley assembly.
(3) Crane Traveling Motor
Type: Asynchronous AC motor or DC motor
Purpose: Responsible for the horizontal movement of the entire crane along the rails.
Power Rating: Can range from 5kW to 150kW, depending on the size of the crane.
Features:
High torque to move heavy structures.
Precise speed control for accurate positioning.
Heavy-duty protection to prevent overheating and wear.

.

Sound and light alarm system & limit switch

1)Sound and Light Alarm System
The Sound and Light Alarm System is designed to warn operators and nearby workers of the crane's movements, abnormal conditions, or potential hazards. It is essential for safety, communication, and accident prevention in busy industrial environments.
2)Limit Switch
A limit switch is a safety device that automatically stops or limits the movement of the crane when it reaches a pre-set position or an unsafe limit. Limit switches are essential for preventing over-travel or overload situations that could damage the crane or cause accidents.

10.Safety Devices

(1) Overload Protection Device
Purpose: Prevents the crane from lifting loads that exceed the rated load capacity.
(2) Limit Switches
Purpose: Automatically stops or limits the crane's movement when it reaches a pre-set boundary or unsafe position.
(3) Emergency Stop System
Purpose: Quickly halts crane operation in the event of an emergency to avoid accidents or damage.
(4) Anti-Collision System
Purpose: Prevents collisions between cranes or between the crane and obstacles in the work area.
(5) Swing Limit Device
Purpose: Prevents the crane hook from swinging uncontrollably, which can cause load instability.
(6) Emergency Power-off Device
Purpose: Disconnects the crane from its power source in the event of an emergency, preventing further movement and protecting both the crane and the workers.
(7) Warning Lights and Audible Alarms
Purpose: Alerts nearby personnel to crane operations, ensuring safe movement and load handling.

11.Control Mode

1)Cabin Control (Operator Cabin Control Mode)
Overview:
In this mode, the crane is operated from an operator cabin attached to the crane structure, typically located at the top of the gantry frame. The cabin provides the operator with a comprehensive view of the crane's operation and the work area.
2)Pendant Control (Wired Control Mode)
Overview:
In pendant control, the crane is operated via a wired controller (pendant) that is connected to the crane's control system through a cable. The pendant is typically handheld and used by the operator from the ground.
3)Radio Remote Control (Wireless Control Mode)
Overview:
In radio remote control, the crane is operated via a wireless control unit using radio frequency (RF) signals. This mode offers greater flexibility compared to pendant control since it does not require a physical connection.
4)Automatic or Fully Automated Control
Overview:
Automated control is used in highly advanced double girder steel gantry cranes where specific operations are controlled by a computerized system with minimal human intervention.

12.Sketch

Main technical

1. Cost-Effective without Compromising Quality

Chinese manufacturers offer competitive pricing due to large-scale production, efficient supply chains, and in-house fabrication.

Adheres to international standards (ISO, CE, FEM, GB) ensuring performance and safety.

2. High Load Capacity and Wide Span

Double girder design allows lifting capacities from 5 tons to over 300 tons.

Longer spans and higher lifting heights are possible, suitable for wide working areas and large equipment handling.

3. Customization Options

Fully tailored design based on:

Site layout

Lifting requirements

Working environment (indoor/outdoor, corrosive, explosion-proof)

Duty cycle (light to heavy use)

Custom options for hoist type, control system, trolley configuration, and more.

4. Advanced Control and Automation

Integration of VFDs, PLCs, and wireless remote control systems for smooth, energy-efficient operation.

Available with anti-sway technology, load monitoring, and IoT-based remote diagnostics.

5. Strong After-Sales Service & Global Support

Many leading Chinese suppliers provide:

On-site installation and commissioning

Spare parts supply

Training and maintenance support

Remote troubleshooting services

6. Durable & Reliable Construction

High-strength steel fabrication with professional welding and inspection.

Long service life with low maintenance requirements.

Corrosion-resistant coatings suitable for outdoor use or coastal environments.

7. Fast Production and Delivery

Efficient production lines and high manufacturing capacity reduce lead time.

Export-ready packaging and global shipping logistics in place.

8. Proven Track Record in Global Projects

Successfully used in ports, shipyards, railways, power plants, steel mills, and large-scale infrastructure projects across Asia, Europe, Africa, and the Americas.

1)Manufacturing & Heavy Industry
Application: Lifting and moving heavy components in factories and production facilities.
2)Construction Industry
Application: Handling construction materials at building sites, bridges, and infrastructure projects.
3)Shipbuilding & Marine Industry
Application: Moving heavy ship components, engines, and hull sections in dockyards and shipyards.
4)Railway & Transportation Industry
Application: Lifting rail components, train carriages, and containers in railway yards and depots.
5)Ports & Logistics Warehouses
Application: Handling cargo, shipping containers, and bulk materials in ports, harbors, and warehouses.
6)Power Plants & Energy Sector
Application: Moving turbine components, transformers, and generators in hydropower, nuclear, and thermal plants.

1. Raw Material Preparation
Purpose: Ensure high-quality steel and materials for the crane's components.
Key Steps:
Selection of high-strength steel plates and profiles.
Material cutting using CNC plasma cutting, laser cutting, or flame cutting.
Quality inspection of raw materials to ensure structural integrity and compliance with standards.
2. Main Girder & Structure Fabrication
Purpose: Construct the core structure of the crane.
Key Steps:
Welding and assembly of the double girder beams.
Bending and shaping steel plates for precise girder dimensions.
Weld inspection using ultrasonic or X-ray testing to ensure structural strength.
Surface treatment (e.g., sandblasting, rust removal, primer coating).
3. End Carriage & Trolley Fabrication
Purpose: Manufacture and assemble the components for crane movement.
Key Steps:
Cutting and welding of end carriage frames.
Precision machining of wheelsets and end carriage components.
Installation of trolley frame, wheels, and travel mechanisms.
Quality check for dimensional accuracy and alignment.
4. Hoisting & Lifting Mechanism Assembly
Purpose: Install the hoist system for lifting operations.
Key Steps:
Mounting of electric hoist or winch on the trolley.
Motor, gearbox, and brake system installation.
Fitting of wire rope drum, pulleys, and hook block.
Load and operational tests for smooth lifting function.
5. Electrical & Control System Installation
Purpose: Ensure seamless operation with automated controls.
Key Steps:
Installation of motors, limit switches, sensors, and safety devices.
Electrical wiring and connection to the control panel.
Configuration of remote control, pendant control, or cabin control.
Testing of electrical circuits and emergency stop functions.
6. Surface Treatment & Painting
Purpose: Protect the crane from corrosion and environmental damage.
Key Steps:
Sandblasting and surface cleaning.
Application of anti-corrosion primer.
Final painting with industrial-grade coatings.
Marking and labeling of safety signs and load capacity indicators.
7. Assembly & Pre-Delivery Testing
Purpose: Ensure the crane meets operational and safety standards.
Key Steps:
Full assembly of the crane structure.
Load testing to check lifting capacity and stability.
Operational testing of all mechanical and electrical components.
Fine-tuning and quality inspection before shipment.
8. Packing & Delivery
Purpose: Secure components for safe transport.
Key Steps:
Disassembly (if required) for transportation.
Packaging of motors, control panels, and electrical components.
Loading onto trucks or containers for delivery to the customer.
Providing installation and maintenance manuals for customer reference.

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%.