15m Span Double Girder Gantry Crane

15m Span Double Girder Gantry Crane – Introduction

A 15-meter span double girder gantry crane is a heavy-duty lifting system designed for material handling in outdoor yards, factories, and construction sites. With its robust double-girder structure, this crane provides high strength, stable lifting performance, and excellent load distribution across the 15m span. It is commonly equipped with a trolley hoist running on the upper rails of the girders, enabling precise vertical and horizontal load movement. This crane is suitable for medium to heavy lifting tasks and can be customized with various lifting capacities, lifting heights, and operational controls.

Main Components

Double Girders – Rigid welded beams providing strong support and stability across the 15m span.

Crane Trolley / Hoist – Electric hoist or trolley with lifting mechanism traveling along the girders.

Gantry / Legs – Vertical steel supports connecting the girders to the ground-running end carriages.

End Carriages & Wheels – Powered wheel assemblies ensuring smooth travel along the ground rails.

Rail System – Ground tracks enabling long-distance movement of the entire crane.

Electrical System – Includes power supply cable, control panel, conductor system, and safety devices.

Control Options – Pendant control, wireless remote control, or cabin operation (optional).

Safety Devices – Overload limiter, travel limit switches, emergency stop, buffers, anti-collision systems.

Advantages

High Load Capacity & Structural Strength – Double-girder design supports heavier loads with minimal deflection.

Wide Working Range – 15m span offers efficient coverage for large material handling areas.

Flexible Configuration – Can be customized with different hoists, lifting speeds, and control systems.

Stable Traveling Performance – Strong legs and end carriages ensure smooth, vibration-free operation.

Reliable Outdoor Operation – Weather-resistant design with protective coatings for long service life.

Excellent Precision – Accurate positioning due to smooth trolley and gantry travel mechanisms.

Low Maintenance Cost – Durable structural components and easy-access drive systems.

Applications

Manufacturing Workshops – Handling heavy components, molds, and assemblies.

Precast Concrete Yards – Moving concrete panels, beams, and blocks.

Steel Structure & Fabrication Plants – Lifting steel plates, frames, and fabricated modules.

Marble/Stone Processing Yards – Transporting stone slabs and blocks.

Logistics Yards & Warehouses – Loading/unloading heavy cargo.

Construction Sites – Supporting structural lifting and material distribution.

Shipyards & Ports – Handling parts, equipment, and containers (for moderate capacity).

Core Components: Gearbox, Motor

Place of Origin: Henan, China

Warranty: 2 years

Weight (KG) : 22600 kg

Video outgoing-inspection: Provided

Machinery Test Report: Provided

Application: Widely

cantilever length : 0-15m

Trolley running speed: 20-40M/MIN

Working system: A5-A7

Lifting speed: 5-15M/MIN

Crane running speed: 30-50M/MIN

Control method: cabin control/wire rope remote control

Color: Request

1.Double Main Girders

Two parallel welded steel girders forming the main load-bearing structure.

Provide high strength and low deflection across the 15m span.

The main beam of a ceiling mounted gantry crane plays a pivotal role in its structural integrity and operational efficiency. Here are its key aspects:

1)Core Functionality: Serves as the primary support structure, ensuring safe and effective load distribution.

2)Materials Used: Constructed from high-tensile steel or aluminum to handle heavy-duty operations while maintaining lightweight efficiency for certain applications.

3)Single Girder: Suitable for light to medium loads, offering cost-effective solutions.

4)Double Girder: Designed for heavy-duty lifting with enhanced stability and higher load capacities.

5)Reinforcement Features: Includes bracing and stiffeners to minimize deflection and ensure consistent performance under stress.

6)Maintenance-Friendly: Engineered for easy inspection and servicing to maintain operational reliability over time.

Crane Trolley / Hoist

Electric wire rope hoist or trolley hoist mounted on top of the girders.

Includes lifting motor, drum, wire rope, hook block, and safety devices.

Ceiling Support Structure:The system of ceiling mounted gantry crane is suspended from the building's ceiling or overhead structural elements (e.g., beams, trusses, or columns).This eliminates the need for floor-mounted supports, freeing up valuable floor space for other activities.The ceiling structure must be able to support the weight of the crane system and the loads it will lift, often requiring reinforcement depending on the load capacity.

2) Rail and Trolley System:The crane travels along rail tracks mounted on the ceiling. These tracks guide the movement of the hoist and trolley along a horizontal path, enabling load movement within a designated area.The hoist is mounted on a trolley, which can move along the ceiling tracks, typically in one or two directions, depending on the configuration of the rails.

3) Hoist Mechanism:The hoist is responsible for lifting and lowering the load. It can be powered either electrically or manually.The lifting capacity of the hoist, and the crane system overall, depends on the type of hoist (e.g., electric chain hoists, wire rope hoists) and the materials used in its construction.

4) Control Mechanism:Ceiling-mounted gantry cranes are usually operated via a pendant control or remote control, allowing operators to manipulate the movement of the crane and hoist from a safe distance.Controls allow for precise operation, ensuring that loads are moved efficiently and safely.

3.End Carriages

Horizontal frames assembled at both ends of the girders.

Equipped with wheels and drive motors for long-travel movement.

1) Support and Movement:The end carriage supports the crane's trolley and hoist system, allowing them to move along the ceiling tracks (rails). It is designed to travel along the tracks while carrying the load, providing smooth horizontal motion.

2) Structural Base:The end carriage forms the foundation of the crane's travel mechanism. It houses the wheels or rollers that run along the ceiling rails. These wheels or rollers are designed to handle the loads and stresses exerted during crane movement.

3) Guide and Stability:The end carriage helps keep the crane system aligned and stable, ensuring the hoist and trolley remain on the tracks during operation. It prevents the crane from derailing or misaligning as it moves along the ceiling rails.

4) Load Distribution:The end carriage distributes the load between the two end supports (usually located at the building's walls or ceiling beams). This ensures that the load is lifted evenly and that the crane operates safely under heavy loads.

4.Crane travelling mechanism

1)Manual Traveling Mechanism:For lighter-duty or smaller ceiling mounted gantry cranes, the traveling mechanism may be manually operated. In this case, the operator uses a hand chain or a push/pull system to move the crane along the tracks.Manual systems are simpler and less expensive but require physical effort from the operator to move the crane, making them suitable for lighter and less frequent lifting tasks.

2)Motorized (Powered) Traveling Mechanism:In most industrial applications, the crane's traveling mechanism is powered by an electric motor. The motorized system is more efficient and provides greater control over the crane's movement, particularly for heavy-duty operations.A motorized crane traveling system can move heavier loads faster, with precise speed control and the ability to stop and start quickly and smoothly.Motorized systems typically include a geared drive, where the motor turns a gear to move the crane's wheels along the tracks. The geared drive mechanism helps in achieving controlled and consistent speeds.

3)Variable-Speed Mechanism:In more advanced or automated systems, a variable-speed drive can be integrated into the crane traveling mechanism. This allows the crane to change speeds smoothly during operation, which is particularly useful for applications requiring precision or speed adjustments.

5.Trolley travelling mechanism

1)Manual Trolley:In manual trolley systems, the trolley is moved by hand, often using a hand chain, pull cord, or crank system. This is common in light-duty applications where precise positioning isn't required, and load capacities are smaller.Manual trolleys are simpler and more cost-effective but require physical effort from the operator, limiting their use in larger, heavier operations.

2)Electric (Motorized) Trolley:Electric trolleys are powered by electric motors and are more common in industrial settings due to their speed, precision, and ease of use. They can be powered by a single-phase or three-phase motor, depending on the load and application.

The electric drive system allows for more precise control over speed and direction, enabling efficient and reliable horizontal movement of heavy loads.

3)Variable-Speed Trolley:Some trolley systems feature variable-speed drives, allowing the operator to adjust the speed of the trolley as needed. This is especially useful in applications requiring precise load handling, such as assembly lines, heavy machinery installation, or in environments where the load is delicate and requires careful movement.

4)Dual-Speed Trolley:Dual-speed trolleys offer two preset speeds for moving the trolley: a fast speed for long-distance travel and a slow speed for precise positioning near the load or destination.

This type of system is commonly used in environments that require both quick and precise movements.

6.Crane wheel

1)Wheel Hub: The hub is the central part of the wheel that holds the axle and connects the wheel to the end carriage or trolley. The hub must be strong enough to handle the forces involved in moving the crane.Tread: The outer part of the wheel that comes into contact with the rail. The tread must match the rail profile to ensure smooth and safe operation.Bearings: Bearings are used inside the wheel hub to reduce friction and allow the wheel to rotate smoothly. Proper bearing selection is critical for ensuring the smooth operation of the crane wheels.Flange: Some crane wheels have a flange, which is a raised part on the outer edge of the wheel. The flange helps keep the wheel properly aligned with the rail, preventing the crane from derailing.

2)Wheel Material and Design Considerations:

Strength and Durability: Crane wheels are designed to bear heavy loads without deforming or wearing out too quickly. For heavy-duty cranes, solid steel or forged steel wheels are typically used for their strength and durability.Wear Resistance: Crane wheels experience continuous friction as they roll along the rails, so material wear resistance is crucial. Steel and cast steel wheels are designed to minimize wear, while rubber-coated wheels can wear down more quickly in heavy-duty environments.Noise and Vibration: Wheels made of rubber or polyurethane are typically quieter than steel wheels, making them ideal for environments where noise reduction is important

7.Crane Hook

1)Function of the Hook:The hook's primary function is to lift and secure the load by attaching to the lifting sling, chain, or hook block that is connected to the load.

It is located at the bottom of the crane's hoist mechanism and moves vertically along the lifting height as the crane performs lifting and lowering operations.The hook must maintain a secure connection with the load throughout the operation to prevent accidents, slippage, or dropping of the load.

2)Hook Dimensions:The size and dimensions of the hook depend on the weight of the load being lifted, the lifting height, and the overall design of the crane system.Hook throat opening: The throat is the space through which the load sling or chain passes. The size of the throat must be large enough to accommodate the lifting equipment while providing a secure grip on the load.Hook length and capacity: The length and overall size of the hook are determined by the crane's lifting capacity and the size of the typical load being lifted. The hook's load-bearing capacity must match or exceed the weight of the heaviest load to be lifted.

8.Motor

1)Function of the Motor:Hoisting Motor: The motor used for lifting and lowering the load is typically located in the hoist unit and is responsible for driving the drum or winch to wind and unwind the rope or chain that raises and lowers the hook.Travelling Motor: Motors are also used to drive the end carriage and trolley movement along the rails, allowing the crane to move horizontally along the gantry. The crane travel motor powers the crane's movement along the ceiling-mounted track or gantry rails, while the trolley motor drives the horizontal movement of the hoist.Rotation Motor: If the crane features a swivel or rotating hook, there may also be a motor that controls the rotational movement of the load.

2)Motor Power and Capacity:The power rating of the motor is essential for determining the crane's lifting capacity and the speed at which it can operate. Higher-power motors are required for heavy-duty cranes that move larger and heavier loads.Hoisting Motor: The power rating of the hoisting motor is based on the weight of the load being lifted and the speed of hoisting required. The motor needs enough torque to lift the load efficiently while maintaining safe operational limits.

Travelling Motors: These motors are rated for the speed and load conditions associated with the crane's horizontal movement. For high-speed operations, more powerful motors may be needed to ensure the crane can move swiftly along the gantry tracks.

3)Motor Control Systems:Variable Frequency Drive (VFD): To provide adjustable speed control, cranes often use a VFD system that adjusts the frequency of the electrical supply to the motor. VFD allow precise control of motor speeds for hoisting, traveling, and positioning, which is crucial in applications requiring careful load placement.Soft Starters: These devices limit the inrush current when the motor is started, providing smoother acceleration and reducing wear on the motor and other components. Soft starters are commonly used in crane systems to extend the lifespan of the motor.Reversing Starter: To change the direction of crane movement , a reversing starter is used. This control allows the motor to run in both directions depending on the load and crane's movement requirements.

4)Motor Speed Control:Hoisting Speed: The hoisting motor must provide enough torque to lift the load at the required speed. In some cases, a dual-speed motor or multi-speed hoisting system may be used to allow operators to adjust the speed depending on the load's weight or lifting requirements.

Travel Speed: The travel speed of the gantry crane is also controlled by the motors. The speed of the crane and trolley movement is often adjusted depending on the load size, work environment, and safety regulations.

Cooling Systems:Motors used in gantry cranes, particularly those in heavy-duty applications, often include cooling systems to prevent overheating during extended use. This is especially critical in applications where the crane

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9.Sound and light alarm system & limit switch

1)Warning for Movement:When the crane is in motion, the alarm system can alert people in the vicinity that the crane is operating. This reduces the likelihood of accidents, especially in busy or crowded work environments.The alarm system can be activated when the crane begins moving horizontally or vertically (hoisting or traveling).

2)Load Overload Warning:If the crane's load exceeds a predetermined weight limit (based on the crane's rated capacity), the system can trigger an alarm to alert the operator and prevent overloading, which could damage the crane or cause safety hazards.

3)Limit Position Warning:If the crane approaches its travel limit or hoisting limit (i.e., the maximum height or horizontal movement), the alarm system can signal the operator to stop before reaching a dangerous point, thus avoiding damage to the crane or load.

4)Malfunction and Fault Warning:In case of a malfunction or failure in one of the crane's key components (e.g., the motor, brakes, or lifting mechanism), the alarm system can alert the operator to take immediate action or stop the crane for safety inspection.

5)Emergency Warning:In the event of an emergency or safety incident, the sound and light alarm system can activate to provide a clear signal for evacuation or to draw attention to the problem, ensuring quick action is taken to mitigate risks.

10.Safety Devices

1)Overload Protection System Function: The overload protection system ensures that the crane does not exceed its rated load capacity, preventing mechanical failure and damage to the crane or load.

Components:Load Cells: These sensors measure the weight of the load being lifted and provide feedback to the control system.

Overload Limit Switches: These switches activate when the load exceeds the crane's safe operating capacity, stopping further lifting operations.Warning Signals: An alarm or visual signal (light or sound) alerts the operator when the crane is nearing or has exceeded the maximum load limit.Benefits:Protects the crane's structural components (hoist, motor, brakes) from being damaged by excessive loads.Increases safety by preventing overloading incidents, which can lead to crane failure or accidents.

2)Limit Switches:Function: Limit switches are used to prevent the crane from exceeding its maximum travel or hoisting range. They ensure the crane operates within safe boundaries and prevent over extension of the hoist or trolley.

Types:Vertical Limit Switches (Hoisting Limit): Prevent the hook or load from being lifted beyond a specified height.

Horizontal Limit Switches (Travel Limit): Stop the crane from traveling past its designated rails or work area.Trolley Limit Switches: These stop the trolley from moving beyond its designated travel path.

Benefits:Prevents mechanical damage from over-travel or over-hoisting.Ensures the crane doesn't interfere with other machinery or structures by limiting its range of movement.Enhances the safety of the operation by ensuring the crane only moves within the designated safe zones.

11.Control Mode

1) Manual Control Mode:Description: In manual control mode, the crane is operated by the crane operator using physical controls like joysticks, push buttons, or switches. This mode provides direct, hands-on control over the crane's movements.Control Components:Joystick/Control Levers: Used to control the movement of the hoist (up/down), trolley (left/right), and crane (longitudinal travel).Push Buttons/Switches: For turning the crane on/off, activating specific functions, or controlling speed and direction.Pendant Control: A remote control unit that allows the operator to control the crane from a distance, typically used for precise load handling or when operating in tight or hazardous spaces.

2) Radio Remote Control Mode:Description: Radio remote control mode allows the crane operator to control the crane remotely using a wireless control system. This mode is typically used in situations where the operator needs to control the crane from a safe distance,

3) Cabin Control Mode:Description: In this mode, the operator controls the crane from a cabin located on the crane's bridge or trolley. The cabin is equipped with a range of controls, and the operator can monitor the load and environment directly while operating the crane.

12.Sketch

Main technical

Advantages

1. High Load-Bearing Capacity

The double-girder structure provides excellent strength, allowing the crane to handle heavier loads with minimal deflection and superior stability compared to single-girder designs.

2. Wide Working Range

A 15-meter span offers a broad coverage area, improving material handling efficiency in workshops, yards, and construction sites.

3. Smooth and Stable Operation

Equipped with robust end carriages, precision wheel assemblies, and reliable drive systems to ensure smooth trolley movement and crane travel.

4. Flexible Configuration

Supports various hoist types, lifting speeds, travel speeds, and control methods (remote, pendant, cabin), enabling customization for different industries.

5. Long Service Life

Made with high-grade steel, corrosion-resistant coatings, and industrial-grade electrical components suitable for continuous operation.

6. High Precision Positioning

The double-girder design allows for precise lifting and lateral movement, ideal for handling delicate or heavy materials.

7. Easy Maintenance

Key components such as hoist, motors, electrical panel, and wheels are accessible for servicing, reducing downtime and maintenance costs.

8. Excellent Outdoor Performance

Can be equipped with rail clamps, storm brakes, rain covers, and anti-wind devices, ensuring safe operation in outdoor environments.

9. Enhanced Safety

Built with overload protection, emergency stops, limit switches, and anti-collision systems, reducing operational risks.

Applications

1. Manufacturing Workshops

Used for lifting molds, machinery parts, heavy components, and assembly materials within medium to heavy-duty production lines.

2. Steel Structure & Fabrication Plants

Suitable for handling steel plates, structural beams, welded assemblies, and large metal frames.

3. Precast Concrete Yards

Ideal for moving concrete slabs, beams, columns, and other precast components.

4. Marble & Stone Processing Yards

Used for lifting and transporting stone blocks, slabs, and heavy raw materials between cutting and storage areas.

5. Logistics & Storage Yards

Supports loading/unloading of large cargo, pallets, containers, and heavy equipment in open yards.

6. Construction Sites

Assists in lifting building materials, large formwork, steel structures, and equipment, especially in infrastructure and industrial projects.

7. Rail & Vehicle Maintenance Depots

Used for handling engines, bogies, vehicle components, and heavy tools during repairs or assembly.

8. Shipbuilding & Marine Engineering

Handles ship parts, metal plates, and marine components in mid-sized shipyards or repair areas.

9. Power Plants & Heavy Utilities

Used for installing or maintaining turbines, transformers, and other heavy equipment.

1. Design stage: Understand the specific needs of customers, including load-bearing capacity, span, height and use environment. Carry out preliminary design according to the needs and draw scheme drawings, including structural design, power system and control system design. Carry out structural strength, stability and dynamic analysis to ensure that the design meets relevant standards and specifications.

2. Material preparation: Select suitable materials according to design requirements, such as high-strength steel, aluminum alloy, etc., to ensure good mechanical properties and durability. Purchase the required raw materials and components according to the design drawings, including motors, reducers, hooks, control systems, etc.

3. Processing and manufacturing: Cut the steel and process the main beam, end beam and other structural parts according to the design dimensions. Connect the cut parts by welding to form the main structural frame of the crane. Finish the welded components, including drilling, turning and milling, to ensure the matching accuracy of each component.

4. Assembly: Preliminary assembly of the processed components to check the stability and matching of the structure. Install the lifting mechanism, trolley running mechanism and trolley running mechanism to ensure that all moving parts can run smoothly.

5. Electrical system installation: Install motors, inverters, control panels and other electrical components to ensure that the electrical system is connected correctly. Arrange the cable lines reasonably to ensure safety and beauty, and reduce interference and wear.

6. Commissioning and testing: Test the various functions of the crane, including lifting, moving, braking and alarm systems, to ensure that all functions are normal. Carry out safe load tests to ensure that the crane operates stably under maximum load and meets safety standards.

7. Inspection and quality control: Carry out quality inspections on each link of production to ensure that all components meet design and standard requirements. Carry out qualification certification according to relevant regulations to ensure that the equipment meets national and industry standards.

8. Delivery and installation: Transport the manufactured crane to the customer site. Install it at the customer site, including fixing the foundation, commissioning and connecting the power supply. Provide operation training to customers to ensure that they can use the equipment safely and effectively, and officially deliver it for use.

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%.