High Quality Double Girder Gantry Crane 150 Tons Capacity

A High Quality Double Girder Gantry Crane is a heavy-duty material handling solution designed for outdoor or indoor use where overhead crane systems are not feasible. It features two main girders supported by legs that move on ground rails, and is ideal for large-span and high-capacity lifting applications.

 

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

Materials and Fabrication
Material: High-strength structural steel such as Q235B / Q345B / Q355B

Type:

Welded box girders (common for large capacity cranes)

H-beams (for smaller or medium cranes)

Process:

CNC cutting of steel plates

Assembly & welding

Stress relief treatment

Sandblasting & anti-corrosion painting

Rail and walkway installation

2.Lifting System

The lifting system is the core operating unit of the gantry crane, responsible for raising, lowering, and positioning heavy loads. It is typically installed on a trolley that travels along the two main girders of the gantry structure.

3.End carriage

The end carriages are horizontal steel structures located at both ends of the gantry crane. They support the main beams (girders) and house the traveling mechanism, allowing the whole crane to move back and forth along its working area.

4.Crane travelling mechanism

The crane traveling mechanism is responsible for moving the entire gantry crane (including the gantry frame, trolley, and load) horizontally along ground-mounted rails. It ensures the crane can transport loads over long distances across the work area.

5.Trolley travelling mechanism

The trolley traveling mechanism enables the lifting trolley-which carries the hoist and hook assembly-to move horizontally along the top of the two main girders. This movement allows precise positioning of loads across the crane's working span.

7.Crane Hook

The hook is the primary load-handling component of the lifting system. It directly engages with slings, chains, or lifting tools to raise and lower loads. In a double girder gantry crane, the hook is typically mounted on a trolley hoist that moves along the main girders.

8.Motor

The motor system is the powerhouse of a lifting double girder gantry crane, driving its hoisting, trolley traveling, and crane traveling functions. Each movement typically has a dedicated motor, specially selected based on capacity, duty cycle, and required precision.

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9.Sound and light alarm system & limit switch

Sound and Light Alarm System & Limit Switches
(For Lifting Double Girder Gantry Crane)
These systems serve as essential safety devices, helping prevent accidents, signal danger or operation, and ensure that the crane's movements remain within safe boundaries.
1)Sound and Light Alarm System
Purpose:
Warn nearby personnel of crane movement or lifting operations

Enhance visibility and safety in noisy, outdoor, or hazardous environments

Alert in case of emergency stops, overloads, or limit switch activation
2)Limit Switches
Purpose:
Limit switches prevent mechanical overrun, protect structural components, and ensure safety by stopping motion at preset points.

10.Safety Devices

1)Overload Protection Device
Function: Prevents the crane from lifting loads beyond its rated capacity.

Working Principle: A load sensor or mechanical overload limiter cuts off the hoist circuit when overload is detected.

Display: Often includes a digital display showing real-time load weight.

2)Emergency Stop Button
Location: Control pendant, cabin, or remote controller.

Function: Immediately shuts down all crane operations in emergencies.

Design: Large, red, and easy to access; latches in "off" position.

3)Sound and Light Alarm System
Function: Audible and visual warning before crane movement.

Installation: Mounted on the gantry frame or trolley.

4)Overheat / Overcurrent Protection (Electrical)
Installed in the motor, inverter, and control panel

Shuts down the system to prevent electrical fires or damage
5)Anti-Derailment Devices
Guide rollers or clamps keep wheels aligned on the rail.

Essential for cranes operating on long or uneven tracks.

11.Control Mode

1)Pendant Control
Description: A handheld control device connected to the crane via a cable.

Features:

Simple and intuitive buttons or joysticks.

Allows operator to walk close to the load for precise control.

Limited by cable length.

Use Cases: Indoor environments with manageable distances and good visibility.

2)Wireless Remote Control
Description: A wireless handheld transmitter that communicates with the crane's receiver.

Features:

Provides freedom of movement without cable restrictions.

Typically uses radio frequency (RF) communication.

Includes safety features like dead-man switch and emergency stop.

Use Cases: Outdoor sites, large yards, or areas where cables can be hazardous.

3)Operator Cabin Control
Description: Enclosed cabin mounted on the crane structure (often on the gantry leg or trolley).

Features:

Provides operator with a panoramic view of the work area.

Equipped with joysticks, pedals, and control panels.

Climate-controlled for comfort.

Use Cases: Large, complex sites needing high precision and long operating hours.

4)Ground Control with Touchscreen Panels
Description: Fixed control panels on-site or mobile operator stations with advanced interfaces.

Features:

Integrated with modern PLC or CNC controllers.

Can include touchscreen displays, cameras, and diagnostics.

Use Cases: Automated or semi-automated crane systems.

12.Sketch

 

Main technical

 

 

1. High Load Capacity
The double girder design provides stronger structural support, enabling the crane to lift heavier loads (typically from 5 tons up to 500+ tons).

2. Longer Span & Larger Working Area
Two main girders allow for longer spans, covering wide workspaces efficiently.

Ideal for large outdoor yards, shipyards, and industrial plants.

3. Better Stability & Reduced Deflection
The double girder structure reduces beam deflection under heavy loads, improving lifting accuracy and safety.

4. Higher Lifting Height
Allows the trolley to be mounted between the two girders, increasing available lifting height compared to single girder cranes.

5. Flexible Configuration
Supports various hoisting devices: wire rope hoists, grab buckets, magnets, and double trolley systems.

Adaptable to multiple industrial applications.

6. Enhanced Safety Features
Designed to integrate advanced safety devices like overload protection, limit switches, and anti-collision systems.

7. Durability & Reliability
Built from high-quality materials with robust welding and surface treatment ensuring long service life even in harsh environments.

8. Smooth Operation & Precise Control
Equipped with modern motors and control systems (VFD, remote control) for smooth and precise movement of load, trolley, and crane travel.

 

1. Steel Industry
Handling heavy steel coils, plates, beams, and structural components.

Loading/unloading materials in steel mills and fabrication shops.

Supporting rolling mills and casting operations.

2. Shipyards & Ports
Lifting and moving heavy ship parts, containers, and cargo.

Assembly and maintenance of ship sections.

Container stacking and transportation in container yards.

3. Construction Sites
Handling large precast concrete segments, steel structures, and equipment.

Bridge construction and heavy infrastructure projects.

Moving materials over wide open areas.

4. Power Plants & Energy Sector
Installation and maintenance of turbines, generators, and heavy equipment.

Handling transformers and power station components.

5. Logistics & Warehousing
Loading/unloading and stacking of heavy cargo.

Supporting large distribution centers and freight yards.

6. Manufacturing Plants
Assembly lines requiring heavy lifting and precise material handling.

Automotive, aerospace, and heavy machinery industries.

7. Mining and Metallurgy
Transporting ore, heavy mining equipment, and smelting materials.

Handling bulk materials and large components.

8. Railway Yards
Loading and maintenance of locomotives and freight cars.

Handling track components and heavy rail infrastructure.

 

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%.