Customized Electric Motor Driven Double Girder Gantry Crane

 

Introduction to Customized Electric Motor Driven Double Girder Gantry Crane

A Customized Electric Motor Driven Double Girder Gantry Crane is a high-performance lifting solution designed for demanding industrial applications that require precision, power, and adaptability. Featuring two parallel girders and a motorized travel system, this crane type is engineered for heavy-duty material handling, offering superior load capacity, span, and operational stability.

This crane is custom-built to meet specific project or site requirements, including variations in span length, lifting height, load capacity, travel speed, and control systems. It is commonly used in large-scale industries such as steel production, construction, shipbuilding, and logistics.

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Key Features:

Double Girder Structure: Provides enhanced strength and load distribution for lifting medium to extra-heavy loads.

Electric Motor Drive System: Powers all movement-hoisting, trolley travel, and crane travel-ensuring smooth, precise, and efficient operation.

Customization: Fully tailored to meet project-specific parameters (e.g., span, capacity, lifting height, working class, environment).

Advanced Controls: Options include remote control, cab operation, and PLC automation with safety interlocks and load monitoring.

Mobility Options: Can be mounted on rails or rubber wheels, depending on site requirements.

Weatherproof and Outdoor-Ready: Designed to operate in harsh conditions, with optional wind-proof devices, rain covers, and IP-rated electrical systems.

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Typical Applications:

Heavy manufacturing plants – For handling machinery, tools, and fabricated components.

Shipyards and ports – For lifting ship blocks, engines, and cargo.

Steel and metal industries – For moving large steel coils, plates, and profiles.

Construction and precast yards – For transporting concrete segments and structural components.

Power generation facilities – For assembling and maintaining turbines and heavy generators.

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Benefits:

High efficiency and precision in operations due to electric motor control.

Reduced manual labor and improved workplace safety.

Custom-built configuration optimizes workflow and space utilization.

Long service life with minimal maintenance when properly used and maintained.

 

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 Girders (Main Beams)

Two parallel horizontal beams forming the backbone of the crane.

Made of high-strength structural steel, often with a box-type or I-beam design.

Support the trolley and allow it to travel across the span.

 

Electric Hoist & Trolley System

Mounted on the double girders, the trolley moves horizontally and carries the hoisting mechanism.

Electric motor-driven hoist with either wire rope or chain for lifting loads.

Equipped with geared motors, brakes, and drum mechanisms for controlled lifting.

 

 

3.End Carriages / Gantry Legs

Vertical or angled structures that support the main girders.

Connect the girders to the travel wheels and drive mechanisms.

Can be A-frame, box-type, or custom-built to suit clearance and load requirements.

4.Crane Travel Mechanism (Electric Motor Driven)

Provides longitudinal movement of the entire crane structure along rails or wheels.

Includes:

Motorized wheels (rail-mounted or rubber-tired for mobile models)

Gear reducers

Brakes

Drive shafts (if synchronized on both sides)

 

5.Trolley travelling mechanism

1. Motorized Drive System
Electric Motors: The trolley is powered by electric motors that drive the wheels along the girder tracks. These motors are typically high-efficiency AC motors.
Speed Control: The motor is often equipped with a variable frequency drive (VFD) or an adjustable speed drive, allowing precise speed control for the trolley, making it suitable for different operational requirements.
2. Trolley Wheels and Bearings
High-Load Bearing Wheels: The wheels are designed to handle the load of the crane and the trolley itself. Made from hardened steel, they are capable of bearing heavy loads and ensuring smooth motion.
Self-Aligning Bearings: Bearings are used to reduce friction between the wheels and the tracks. Self-aligning bearings help maintain proper alignment between the wheels and rails, preventing wear and tear.
3. Track System (Girder Rails)
Beam Structure: The trolley moves along the top flanges of the double girder crane's main beams, which form the rail system. The girder design helps distribute the load evenly and provides high structural integrity.
Rail Guides: These guide rails help the trolley travel along the girder and ensure that it does not deviate from its track, improving stability during movement.
4. Load Hook and Hoist Mechanism
Hoist Travel Mechanism: The trolley is typically coupled with the hoisting mechanism, allowing it to travel with the hook in a horizontal direction. This enables precise positioning of the load.
Crane Hook Block: The load hook or hook block is mounted on the trolley, which moves the load across the span of the crane. The trolley and hoist work together to lift and place heavy items in various locations.

6.Crane wheel

1)Wheel Material & Construction
High-Strength Alloy Steel: Made from materials like 42CrMo4 or AISI 4140, which provide high wear resistance and durability.
Heat Treatment: Hardened surfaces (induction or flame hardened) to resist wear and increase service life.
Precision Machining: Ensures accurate rolling and reduces friction, improving efficiency and longevity.
2)Wheel Types
Double Flanged Wheels: Prevent the crane from derailing by providing guidance along the rail.
Single Flanged Wheels: Used in some designs where external guidance is provided.
Flat Wheels: Suitable for certain track systems where guidance comes from the rail.

7.Crane Hook

1)Hook Material & Construction
High-Strength Alloy Steel: Typically made from forged carbon steel or alloy steel such as DIN 17200 C45, 34CrMo4, or AISI 4140, ensuring high strength and toughness.
Heat-Treated for Durability: The hook is quenched and tempered to improve hardness and wear resistance, preventing deformation under heavy loads.
Precision Machining: Ensures a smooth surface and uniform strength distribution.
2)Hook Types
Single Hook: Used for lighter loads and general lifting operations.
Double Hook: Used for more stable and heavy-duty lifting, reducing load swing and increasing safety.
Forged Hook: Provides high strength and impact resistance compared to cast hooks.
3)Load Capacity & Safety Factor
Rated for 40 Tons: Specifically designed to lift and support a maximum safe working load (SWL) of 40,000 kg.
Safety Factor: Typically 4:1 or 5:1, meaning the hook can handle 4 to 5 times the rated load before failure.

Motor

Key Features of Gantry Crane Motors
1)High Efficiency & Power
Three-phase asynchronous motors are used for high power efficiency.
Designed for continuous operation in demanding industrial environments.
2)Variable Frequency Drive (VFD) Control
Provides smooth acceleration and deceleration, reducing mechanical stress.
Allows precise speed adjustments for lifting and traveling motions.
Reduces power consumption and enhances energy efficiency.
3)Heavy-Duty Design for Harsh Environments
IP55 or higher protection rating (dustproof and waterproof).
Class F or H insulation to withstand high temperatures.
Shock and vibration-resistant construction for durability.
4)Overload Protection & Safety Features
Thermal protection to prevent overheating.
Torque limiter to prevent excessive force on the gearbox.
Brake system integration to ensure load security.

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Sound and light alarm system & limit switch

1)Sound and Light Alarm System
Purpose and Function
Provides audible and visual warnings to alert workers about crane movements.
Ensures safety by warning people in the vicinity of crane operation, load movement, or emergencies.
Required by OSHA, FEM, ISO, and other safety standards for heavy industrial cranes.
2)Limit Switch System
Purpose and Function
Prevents the crane and trolley from exceeding their designed travel limits.
Enhances safety by stopping motion at pre-set endpoints.
Protects mechanical components from damage due to over-travel.

10.Safety Devices

1)Overload Protection Device
Function: Prevents lifting loads beyond the crane's rated capacity (40 tons).
2)Limit Switches
Hoisting Limit Switch: Stops the hook at the maximum lifting height to prevent over-winding.
Trolley Travel Limit Switch: Prevents the trolley from overrunning the girder.
Crane Travel Limit Switch: Stops the crane before it reaches the end of the rails.
Overload Limit Switch: Detects excessive weight and prevents lifting beyond safe limits.
Emergency Stop Limit Switch: Allows immediate shutdown in case of emergencies.
3)Anti-Collision System
Function: Prevents collisions between multiple cranes or between a crane and surrounding structures.
4)Emergency Stop System
Function: Provides an instant shutdown during critical situations.
5)Braking System
Electromagnetic Brakes
Engages automatically when the motor stops to prevent unintended movement.
Hydraulic Brakes
Used for heavy-duty applications to ensure smooth and controlled stopping.
Fail-Safe Brakes
Automatically applies brakes in case of power loss or motor failure.

11.Control Mode

1)Cabin Control (Driver's Cabin)
Operator sits inside the cabin for full manual control.
2)Wireless Remote Control
Operates crane from a safe distance via radio signals.
3)Pendant Control (Wired Controller)
Operator controls crane via a hanging push-button panel.
4)Automated / Semi-Automatic Control
Pre-programmed movements for efficiency and accuracy.

12.Sketch

 

Main technical

 

 

 

Advantages of a Customized Electric Motor Driven Double Girder Gantry Crane

1. High Lifting Capacity

The double girder structure allows for significantly higher load ratings-ideal for handling heavy and oversized materials, often exceeding 50 tons.

Suitable for demanding industrial applications like steel plants, shipyards, and construction sites.

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2. Fully Customizable Design

Engineered to meet specific site conditions, such as:

Lifting height

Span length

Travel speed

Environmental exposure (indoor/outdoor, high temperature, explosion-proof zones)

Enables perfect integration into existing workflows and facilities.

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3. Electric Motor-Driven Efficiency

All crane movements-hoisting, trolley travel, and crane travel-are powered by electric motors, offering:

Smooth and precise motion

High energy efficiency

Reduced operator fatigue

Fast response and control

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4. Wide Span and Extended Coverage

Double girders support longer spans, allowing the crane to cover larger working areas.

Optional cantilever extensions allow the trolley to travel beyond the support legs.

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5. Enhanced Stability and Rigidity

The twin-girder design ensures greater structural integrity and reduced deflection, even under full load.

Ideal for critical lifting where minimal sway and vibration are essential.

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6. Reliable and Safe Operation

Equipped with modern safety systems:

Overload protection

Limit switches

Emergency stop

Anti-collision sensors

Can include automated diagnostics and fault detection systems for proactive maintenance.

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7. Flexible Installation & Mobility

Can be mounted on fixed rails or designed as rubber-tyred mobile gantries, allowing use in:

Temporary work zones

Outdoor yards

Sites without overhead support structures

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8. Reduced Construction Costs

Eliminates the need for overhead crane runways or building reinforcements.

Especially cost-effective for outdoor or semi-permanent applications.

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9. Operator-Friendly Controls

Supports multiple control modes:

Remote control (radio/wireless)

Cabin control

Pendant control

Optional PLC automation and VFDs provide intelligent speed control and process automation.

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10. Long Service Life with Low Maintenance

Designed using durable, high-quality components.

Electric drives require less maintenance compared to hydraulic or manual systems.

Modular components make servicing and replacement easy and cost-effective.

 

 

Applications of Customized Electric Motor Driven Double Girder Gantry Crane

A Customized Electric Motor Driven Double Girder Gantry Crane is widely used in industries that require heavy lifting, high precision, and adaptable configurations. Thanks to its fully customizable nature and motorized control, it can be tailored to meet a broad range of operational demands.

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1. Heavy Manufacturing Industries

Application: Lifting and transporting heavy machine components, molds, dies, and fabricated structures.

Industries: Heavy machinery, automotive, aerospace, power equipment manufacturing.

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2. Steel and Metal Processing Plants

Application: Handling large steel coils, plates, billets, pipes, and structural steel elements.

Features: High-temperature resistance, rugged build, optional magnetic lifters or clamps.

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3. Shipbuilding and Marine Engineering

Application: Transporting ship blocks, engines, hull sections, and large components across the assembly yard.

Features: Long-span girders, high capacity, outdoor protection (IP-rated enclosures, wind-locking).

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4. Precast Concrete and Construction Yards

Application: Lifting precast beams, slabs, girders, and columns in precast plants or construction zones.

Features: Mobile setup, adjustable span, customized lifting attachments.

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5. Ports and Logistics Hubs

Application: Handling containers, bulk cargo, and heavy equipment in open yards or terminals.

Features: Equipped with spreader beams, rubber tires or rail-mounted systems, and weather protection.

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6. Power and Energy Sector

Application: Maintenance and assembly of turbines, generators, transformers, and heavy electrical equipment.

Industries: Thermal power plants, hydroelectric stations, nuclear facilities, wind farms.

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7. Railway and Metro Infrastructure

Application: Lifting rails, sleepers, tunnel segments, and bridge sections during track laying and tunnel construction.

Features: Mobile configurations with synchronized lifting systems for tandem operations.

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8. Mining and Mineral Processing

Application: Moving ore containers, crushers, processing equipment, and maintenance tools.

Features: Rugged design with high load capacity and resistance to abrasive environments.

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9. Aerospace Industry

Application: Transporting aircraft components, fuselage segments, and engines within assembly hangars.

Features: Precise motion control, anti-sway systems, and high lifting accuracy.

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10. Defense and Military Logistics

Application: Moving armored vehicles, missiles, or modular shelters in depots and defense manufacturing units.

Features: Secure control systems, explosion-proof options, and custom clearance heights.

 

 

1. Design & Engineering
Customized Design: Based on customer requirements (span, height, lifting speed, etc.), engineers create detailed drawings and designs, ensuring compliance with safety standards and load capacity.
Structural Analysis: The design is subjected to structural analysis using engineering software to confirm strength, stability, and proper load distribution.
2. Material Procurement
Raw Materials: High-strength steel plates and sections are ordered for the crane's frame, girders, and other critical components.
Component Selection: Mechanical and electrical components such as motors, gearboxes, hoists, and control systems are sourced from trusted suppliers.
3. Fabrication of Crane Components
Girder Fabrication: The main girders (upper and lower) are fabricated by cutting, welding, and assembling steel sections. This involves creating trusses or box girders for maximum strength.
Frame and Cross Girders: The main frame and cross girders are welded and assembled. These structures support the hoist and other components.
Assembly of Hoist and Trolley: The hoist mechanism (which lifts the load) and the trolley (which moves the hoist along the gantry) are assembled and tested separately.
4. Mechanical and Electrical Assembly
Assembly of the Crane Structure: The gantry frame is assembled on-site, where the upper and lower girders, cross beams, and end beams are joined together.
Installation of Hoisting Mechanism: The hoisting mechanism, including the hoist drum, motor, and gearbox, is integrated into the crane structure.
Trolley and Rail System Setup: The trolley system is mounted to the top girder, and the rail system is set up to guide the trolley's movement along the crane.
5. Electrical & Control System Installation
Wiring and Control Panel: Electrical wiring is installed, connecting the crane's motors, sensors, and control systems. The control panel is set up to manage all crane operations (movement, hoisting, speed control).
Safety Systems: Safety features, such as overload protection, limit switches, anti-collision systems, and emergency stops, are integrated into the control system.
6. Testing & Quality Control
Pre-Assembly Testing: Before full assembly, individual components (motors, hoists, control systems) are tested for performance.
Load Testing: The crane is tested under controlled conditions to ensure it can safely lift the rated 40 tons. This includes both static load tests (testing the crane with weights) and dynamic load tests (testing under actual operational conditions).
Final Inspection: A thorough quality check is performed to inspect welds, joints, and mechanical connections to ensure they meet the required standards.
7. Painting & Corrosion Protection
Surface Preparation: The crane structure is cleaned, and any rough areas are smoothed to ensure proper paint adhesion.
Painting: The crane is painted using high-quality industrial paint to protect against corrosion and environmental factors, ensuring durability in outdoor environments.
Anti-Corrosion Coating: If required, additional anti-corrosion coatings (like hot-dip galvanizing) are applied to key components.
8. Final Assembly & Testing
Complete Assembly: After all components are prepared, the crane is fully assembled and the electrical systems are connected.
Operational Testing: The crane undergoes final operational testing, including all functions (lifting, lowering, trolley movement, etc.), and is calibrated to ensure precision.
Safety Verification: Safety features (limit switches, emergency stop functions, etc.) are verified for full compliance with regulations.
9. Shipping & Installation
Disassembly for Transport: For large cranes, parts may be disassembled for easier transport to the installation site.
On-Site Installation: At the customer's location, the crane is reassembled and installed on-site. The installation team ensures the crane is properly mounted on the rails, and all electrical systems are connected.
Final Site Testing: The crane is tested on-site to ensure that it works as expected, with final adjustments made as needed.
10. Handover & Training
Customer Training: Operators are trained on how to use the crane safely, including control operations and safety procedures.
Documentation: The customer receives the crane's manual, maintenance schedule, and warranty details.

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%.