50 Tons Mg Double Girder Gantry Crane
Products Description
The 50 tons MG double girder gantry crane is a heavy-duty lifting solution designed for outdoor or indoor industrial applications where overhead crane systems are not feasible. "MG" stands for "Motor-driven Gantry", and this type of crane features two main girders supported by legs that move on rails embedded in the ground. It provides a stable and robust lifting structure ideal for handling large, heavy loads.
This crane model is especially suitable for construction yards, precast beam handling, shipyards, container yards, and fabrication shops, where strong lifting capacity, wide spans, and high lifting height are essential.
Key Features:
Rated Load Capacity: 50 tons
Crane Span: Customizable (typically 18–35 meters)
Lifting Height: Up to 12 meters or customized
Working Duty: A5–A6 (medium to heavy duty)
Control Methods: Cabin control, pendant control, or wireless remote control
Power Supply: Cable reel or busbar system
Structural Design:
Double Girder Configuration: Two parallel girders provide excellent load distribution and structural rigidity.
Rigid Box-Type Construction: Welded steel structure ensures long-term durability and resistance to deformation.
Legs: Either A-type or U-type legs, depending on operational and clearance requirements.
Applications:
Steel yards
Precast beam and concrete segment handling
Large fabrication shops
Ports and logistics terminals
Shipbuilding and heavy equipment assembly
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
Pictures & Components
1.Main Girders
Type: Welded box-type double girders
Function: Support the trolley and distribute the lifted load across the span
Material: High-strength structural steel
Feature: Equipped with a rail on top for trolley movement
Legs (Support Frames)
Design: A-frame or U-frame (customizable)
Function: Connect main girders to the end carriages and support the structure
Feature: One leg often includes a flexible connection to allow for rail misalignment tolerance
2.Crane Trolley with Hoist
Type: Electric trolley with hoisting mechanism
Lifting Mechanism: Wire rope hoist or winch-type hoist
Function: Performs vertical lifting and horizontal movement along the girders
Feature: Includes motor, gearbox, drum, wire rope, and hook block
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3.End Carriages (End Beams)
Function: Support the main girders and house the crane travel wheels
Feature: Equipped with motorized wheels for crane movement along ground rails
Drive Type: Motorized with soft-start inverter or traditional rotor motor
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4.Crane Traveling Mechanism
Function: Moves the entire gantry crane along the runway rails
Drive System: Motor + gearbox + brake + wheels
Features: Smooth acceleration/deceleration, anti-skewing control
5.Trolley travelling mechanism
1) Structural composition
Trolley frame: The frame is typically made of high-strength steel to support the load and withstand the stresses during operation.
Wheel set: The trolley is equipped with wheels that run on the rails of the main girder. These wheels are often made of hardened steel or cast steel to ensure durability and wear resistance.
Drive device: Electric motors are commonly used to provide the necessary power for the trolley's movement A gearbox is used to control the speed and torque of the trolley's movement.Couplings connect the motor to the gearbox and ensure smooth transmission of power to the wheels.
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2) Function of the trolley operating mechanism
Horizontal Movement: The primary function of the trolley traveling mechanism is to move the trolley horizontally across the length of the main girders. This movement allows the crane to position the hoist over a desired load location.
Load Handling: By moving along the main girders, the trolley helps in positioning the hoist system accurately above the load, which is necessary for lifting and transferring goods efficiently.
Power Transmission: The traveling mechanism typically uses electric motors and gear systems to provide the necessary torque and speed for the trolley's movement. The motors can be either AC or DC, depending on the design and requirements of the crane.
Rails and Wheels: The trolley runs on rails that are mounted on the main girders. The wheels on the trolley are designed to travel along these rails, ensuring smooth and stable movement. The wheels may be fitted with flanges to prevent lateral movement and maintain alignment.
Safety Mechanisms: The traveling mechanism is equipped with safety features such as limit switches, braking systems, and overload sensors to prevent accidents and ensure the safe operation of the crane.
6.Crane wheel
1) Function of wheels
Load Bearing: In a double main girder gantry crane, each wheel supports a significant portion of the crane's load. The wheels must be engineered to handle both the static and dynamic loads imposed during lifting operations.
Material Handling and Safety: The design of crane wheels must ensure safe operation, especially when handling heavy or oversized loads. The wheels should be engineered to minimize noise and vibrations during operation.
Rail Compatibility: Crane wheels are designed to run on specific rail types (e.g., flat or curved tracks). The size and shape of the wheel flange must match the rail profile to ensure proper fit and smooth operation.
2) Design requirements
Material and Design: Crane wheels are typically made of high-strength steel or cast iron to withstand the heavy loads and stresses associated with lifting and transporting materials. The design often includes a flange to ensure proper alignment and prevent the wheels from derailing off the tracks.
7.Crane Hook
The crane hook of a double main girder gantry crane is an essential component used for lifting and transporting heavy loads.
Design and Structure
Material: Typically made of high-strength steel to withstand heavy loads and provide durability.
Shape: The hook often has a C-shape or a pointed end for securely holding lifting slings or chains.
Size and Capacity: It is designed to match the lifting capacity of the crane, which can range from a few tons to several hundred tons for large industrial cranes.
Types of Hooks
Single Hook: Common in standard applications, used for lifting a load from a single point.
Double Hook: Utilized when a more balanced load is needed, often in double main girder designs for higher lifting capacities.
Crab Hook: In gantry cranes, the hook may be mounted on a trolley or crab that runs along the girders.
Motor
The motor of a double main girder gantry crane is an essential component that provides the power necessary for lifting, traveling, and sometimes rotating the crane's hoist or trolley system.The motor's power rating must match the crane's capacity and the load it needs to lift. Typically, these motors range from a few kilowatts up to hundreds of kilowatts, depending on the lifting and traveling requirements.
Motors can be equipped with variable frequency drives (VFDs) for smooth speed adjustments and energy savings.Safety and control systems like overload protection, braking systems, and emergency stops are incorporated for safe operation.
The motor should be compatible with the electrical supply available at the operating site, which can vary (e.g., 380V/50Hz, 480V/60Hz).The motor in a double main girder gantry crane is used for operations such as lifting heavy loads, moving the crane along the tracks (longitudinal travel), and sometimes lateral movement (cross travel) of the hoist or trolley.
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Sound and light alarm system & limit switch
1) Sound and light alarm system
A double main girder gantry crane, commonly used in heavy-duty operations, often incorporates safety mechanisms like sound and light alarm systems to ensure safe operations.
Sound Alarm (Horns/Buzzers): These are typically loud, audible devices that emit a distinctive sound to alert people in and around the working area. The sound level is designed to be high enough to be heard over operational noise.
Light Alarm (Flashing Lights/Beacons): Visual signals, such as flashing lights or rotating beacons, help alert personnel visually, especially in noisy environments where sound alarms may be insufficient.
2) Limit switch
A limit switch on a Double Main Girder Gantry Crane is a safety device used to prevent the crane from moving beyond a designated range. This ensures the protection of both the crane and its surroundings, as well as any loads being lifted.
Key Functions of Limit Switches:
Position Control: The limit switch helps monitor and control the position of the crane's trolley, hoist, and gantry to prevent over-travel and collisions.
Safety Shutdown: If the crane moves past its allowed limits, the limit switch signals the control system to stop the motor and prevent damage or hazardous situations.
Emergency Stop: It can act as an emergency cutoff to shut down the crane when it approaches the limits of its track or rail, preventing it from derailing or causing accidents.
Types of Limit Switches Used:
Mechanical Limit Switches: Activated by physical contact, often using a lever or cam that triggers the switch when moved by the crane's motion.
Electronic Limit Switches: Use sensors (e.g., inductive, capacitive, or optical sensors) for non-contact detection, providing higher durability and reducing wear and tear.
Rotary Limit Switches: Typically used in applications where rotational motion needs to be monitored, such as in hoists.
Linear Limit Switches: Used for applications where linear travel is monitored, commonly found in the movement of the trolley.
10.Safety Devices
1) 1. Overload Protection Device
Function: Prevents the crane from lifting loads that exceed its rated capacity.
2. Limit Switches
Function: Prevents the crane from moving beyond a set range during operations.
3. Emergency Stop Button
Function: Allows operators to quickly shut down the crane in case of an emergency.
4. Anti-Collision Device
Function: Prevents collisions between the crane and other structures or equipment.
5. Load Sway Control
Function: Reduces load sway during operations, which can be dangerous if uncontrolled.
6. Brake Systems
Function: Ensures that the crane remains in a stationary position when not in motion.
7. Safety Interlocks
Function: Prevents the operation of the crane if certain safety conditions are not met.
8. Warning Alarms and Signal Lights
Function: Alerts personnel in the vicinity of the crane's movement.
9. Anti-Tipping Device
Function: Protects against crane tipping due to uneven load distribution or excessive loading.
10. Cooling System for Motors
Function: Prevents motors from overheating during extended use.
11. Remote Control Systems
Function: Allows operators to control the crane from a safe distance.
12. Crane Monitoring Systems
Function: Provides real-time monitoring of operational parameters such as load weight, speed, and position.
13. Lighting and Visibility Aids
Function: Ensures that the operator has clear visibility, especially in low-light conditions.
11.Control Mode
1)1. Pendant Control
Description: The crane operator uses a wired control pendant to manage the movement of the crane and hoist.
Advantages: Simple to use, cost-effective, and provides direct control from a safe distance.
Usage: Commonly used in stationary or semi-stationary operations where the operator can be close to the crane.
2. Radio Remote Control
Description: Operators use a wireless control unit, which communicates with the crane via radio signals.
Advantages: Offers more flexibility as the operator can control the crane from a greater distance and access hard-to-reach areas.
Usage: Ideal for more complex operations and environments where operator mobility is essential.
3. Cabin Control
Description: The operator sits in a cabin on the crane itself and controls it using a combination of joysticks, buttons, or other controls.
Advantages: Provides a better view of the working area and greater precision in controlling the crane.
Usage: Suitable for heavy-duty operations or when a higher level of control is needed for positioning and maneuvering.
4. Automated Control (Semi-Automatic and Fully Automated)
Description: The crane can be controlled by programmed commands or integrated with automated systems for autonomous operation.
Advantages: Reduces human intervention, improves precision, and enhances safety for repetitive tasks.
Usage: Often used in large-scale operations where high efficiency and continuous operation are necessary.
5. Hybrid Control
Description: Combines manual operation (using pendant, remote, or cabin control) with automated features that can be engaged as needed.
Advantages: Offers versatility for operators who need to switch between manual and automated modes for specific tasks.
Usage: Common in systems designed to be adaptable to various operational requirements.
12.Sketch
Main technical
Advantages
The 50 tons MG double girder gantry crane offers numerous operational and structural advantages, making it a highly efficient and reliable solution for heavy-duty material handling across a wide range of industries.
🔧 1. High Load Capacity and Stability
The double girder design ensures excellent load distribution and structural rigidity, allowing it to handle up to 50 tons safely.
Suitable for frequent heavy lifting tasks with enhanced operational durability.
🏗️ 2. Versatile Span and Height Options
Customizable span (typically 18–35 meters) and lifting height allow the crane to adapt to various worksite layouts and lifting requirements.
Ideal for large-scale outdoor projects or areas with no overhead runway structure.
🚛 3. Efficient Material Handling
Equipped with a trolley and hoist system that moves along the girder, offering precise positioning of heavy loads.
Enables simultaneous horizontal and vertical movement, increasing handling efficiency.
⚙️ 4. Strong Mechanical Performance
Driven by independent motors and gearboxes for hoisting, trolley travel, and crane movement.
Optional frequency converters (VFD) provide smooth start/stop and reduce mechanical stress.
🧱 5. Rugged Construction
Manufactured with high-strength structural steel and welded box girders for maximum durability.
Resistant to harsh environmental conditions, especially in outdoor yards, construction sites, or shipyards.
🛡️ 6. Comprehensive Safety Features
Equipped with overload limiters, emergency stop buttons, travel limit switches, and anti-collision systems.
Ensures operator safety and equipment longevity.
🎮 7. Flexible Control Options
Available with cabin, pendant, or wireless remote control, improving adaptability and operator comfort.
Cabin control includes heating or air conditioning for year-round usability.
💡 8. Easy Maintenance and Long Service Life
Modular design allows quick access to components for maintenance.
High-quality parts reduce downtime and extend operational lifespan.
💰 9. Cost-Effective for Large-Scale Applications
Eliminates the need for overhead crane support structures, reducing infrastructure investment.
Especially cost-efficient in open yards or construction zones.
Application
50 Tons MG Double Girder Gantry Crane Application
The 50 tons MG double girder gantry crane is widely used in various industries for lifting and transporting heavy loads in environments where overhead cranes are impractical or unavailable. Its high capacity, robust design, and operational flexibility make it ideal for both indoor and outdoor heavy-duty applications.
🏗️ 1. Construction and Infrastructure
Precast concrete yard: Lifting and moving precast beams, girders, and columns.
Bridge construction: Handling large structural components such as deck segments and box girders.
Tunnel and subway projects: Transporting and placing heavy concrete segments.
🛳️ 2. Shipbuilding and Marine Yards
Moving heavy ship parts such as hull blocks, engines, and equipment.
Lifting and assembling steel plates and modules during ship fabrication.
Suitable for dockside lifting and logistics support.
🧱 3. Steel and Fabrication Plants
Handling long and heavy steel sections, coils, plates, and fabricated assemblies.
Used in heavy machinery assembly lines for transporting large components between workstations.
🚛 4. Logistics and Freight Yards
Loading and unloading heavy cargo containers or machinery.
Ideal for container yards, rail terminals, and open storage facilities.
⚙️ 5. Power and Energy Sector
Handling transformers, generators, turbines, and pipelines in power plants or substations.
Used in wind turbine and hydroelectric equipment assembly yards.
🏭 6. Mining and Heavy Industry
Transporting ore bins, crushers, and other heavy mining equipment.
Supporting installation and maintenance in large mining or mineral processing facilities.
🛠️ 7. Manufacturing Workshops
Moving molds, dies, and other heavy production tools or components.
Especially useful in automotive, aerospace, and industrial machinery manufacturing.
🧊 8. Outdoor Storage Yards
Efficient for moving bulky or oversized materials that are stored outdoors.
Operates independently of building structures, offering high flexibility.
Crane production procedure
1. Design and Engineering
Blueprint and Structural Design: Engineering teams design the crane based on specifications, considering the weight, span, lifting capacity, and working environment.
Component Specifications: Detailed specifications for components such as the main girders, end beams, hoist system, trolley, and electrical components are prepared.
2. Material Selection and Procurement
Steel Material Selection: High-strength steel materials are chosen for the main girders, columns, and other critical parts.
Procurement: Materials, such as steel plates, sections, bolts, and electrical components, are sourced and inspected for quality.
3. Cutting and Pre-Fabrication
Cutting and Shaping: Steel components are cut, shaped, and welded into preliminary forms according to the design specifications.
Pre-Fabrication Assembly: Components such as beams and girders are pre-assembled to verify that they fit together properly.
4. Welding and Structural Assembly
Welding: Main girders, columns, and other structural components are welded to create a sturdy framework. Specialized welding techniques are used to ensure strength and durability.
Structural Assembly: The main girders and end beams are assembled, ensuring precise alignment for balanced load distribution.
Quality Control: Welding seams and joints are inspected using non-destructive testing (e.g., ultrasonic or X-ray testing) for any structural defects.
5. Machining and Finishing
Machining of Parts: Critical parts such as the wheels, trolley components, and hoists undergo machining for proper fitting and smooth operation.
Surface Treatment: Steel parts are cleaned and subjected to surface treatments like sandblasting and coating to prevent rust and enhance durability.
Painting and Coating: Protective coatings are applied for weather resistance, with a primer followed by top coats.
6. Assembly of Crane Components
Main Girder Assembly: The two main girders are mounted and aligned.
End Beam Installation: End beams are fixed to the main girders, forming the frame of the crane.
Hoist and Trolley Installation: The hoist mechanism and trolley are mounted on the main girder rails and tested for alignment and operational smoothness.
7. Electrical and Control Systems Installation
Wiring and Cabling: Electrical wiring is installed for power supply, control circuits, and safety systems.
Control Panel and Safety Features: The control panel is mounted, with safety features such as limit switches, emergency stops, and overload protection integrated and tested.
Control System Programming: The crane's control system is programmed and tested for correct operation.
8. Testing and Quality Assurance
Load Testing: The crane is subjected to load tests to ensure it can handle its rated capacity without issues.
Operational Testing: Functional tests are performed to check movements, responsiveness, braking systems, and electrical operations.
Inspection and Certification: The crane undergoes final inspections to verify compliance with safety regulations and standards. Certification may be issued by relevant authorities.
9. Final Adjustments and Delivery Preparation
Final Adjustments: Any minor adjustments are made to ensure smooth operation.
Documentation: Operation manuals, maintenance guidelines, and certification documents are prepared for delivery.
Packaging and Shipping: The crane is packaged securely for shipment, ensuring all parts are protected during transit.
10. Installation and Commissioning (at Site)
On-site Assembly: The crane is assembled at the customer's location if required.
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%.
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