15t Double Girder Rail Mounted Gantry Crane

 

A 15-ton Double Girder Rail Mounted Gantry Crane (RMG) is a medium-duty lifting device engineered for precise and efficient handling of moderately heavy loads in outdoor or semi-outdoor work environments. Featuring two robust main girders and rail-guided movement, this crane type offers enhanced lifting capacity, greater stability, and wider operational spans compared to single-girder models.

Key Features:

Rated Capacity: 15 tons, ideal for medium-heavy lifting tasks.

Structure: Double-girder design provides higher strength, stability, and better load distribution.

Mobility: Travels along fixed rails for efficient material handling over large areas.

Span Range: Typically between 10 to 30 meters, customizable to project needs.

Lifting Height: Configurable depending on site and operational requirements.

Components: Includes a hoisting trolley, electric drive systems, end carriages, control cabin (or remote control), and various safety devices.

Applications:

Handling materials in fabrication yards, warehouses, and construction sites.

Lifting steel structures, mechanical parts, molds, or prefabricated components.

Loading and unloading tasks in logistics centers, ports, and railway yards.

Supporting assembly and maintenance operations in medium-sized industrial plants.

Advantages:

Strong and reliable lifting performance.

High operational efficiency and smooth movement in three directions.

Reduced structural stress thanks to double-girder design.

Customizable to meet specific working conditions.

Equipped with modern safety and control systems for secure, precise operations.

Working Principle: The crane lifts the load vertically via the hoisting mechanism, moves the load horizontally along the two girders with the trolley, and travels longitudinally along the ground rails, achieving flexible three-dimensional movement within the working area.

 

Core Components：PLC, Engine, Gear, Motor, Trolley

Place of Origin：Henan, China

Warranty：1.5 years

Weight (KG)：125000 kg

Video outgoing-inspection：Provided

Machinery Test Report：Provided

Application：Outdoor/Factory

Working class：A5

Lifting Weight： 20-450 Ton

Steel track：43kg/m QU70

Voltage：3-Phase A.C.50HZ 380V

Lifting mechanism：Trolly

Crane type：Heavey Duty Gantry Crane

Lifting speed：0.48~4.8m/min

Travelling speed：3~30m/min

Steel material：Q355B

 

 

1.Double Main Girders

Two strong steel beams forming the main structure.

Carry the trolley and distribute the load evenly across the crane.

Built for high stability and minimal deflection under load.

 

Hoisting Trolley

Mounted on the main girders and moves horizontally.

Consists of:

Hoisting Mechanism: Motor, gearbox, brake, wire rope drum, and lifting hook.

Trolley Frame: Supports the hoisting mechanism.

Trolley Travel System: Motors and wheels enabling side-to-side movement across the span.

 

 

3.End Carriages and Legs

Connect the main girders to the traveling system on the rails.

Legs support the structure - they can be designed as A-type, U-type, or straight-type legs depending on clearance needs.

End beams link the legs and house the traveling wheels.

 

4.

Crane Traveling Mechanism

Allows the entire gantry crane to move along the ground rails.

Driven by electric motors with gearboxes.

Uses steel wheels, often double-flanged for stable guidance.

5.Trolley travelling mechanism

1) Structural composition

Trolley frame: The trolley frame serves as the main structural component that houses all the parts of the trolley. It is typically made of steel to handle the stresses and loads. The frame supports the hoist unit and is designed to be strong yet lightweight enough to move efficiently.

Wheels: The trolley is mounted on wheels, which run along rails positioned on the gantry structure. These wheels are typically made of hardened steel to withstand wear and tear.

Drive device: The drive mechanism consists of an electric motor or hydraulic system, depending on the crane's design. The motor is connected to the reduction gear system, which reduces the speed while increasing the torque required to move the trolley.

2) Function of the trolley operating mechanism

Drive System: It typically involves an electric motor connected to a gearbox, which powers the trolley's movement along a set of rails or tracks mounted on the crane's structure. The motor can be controlled to move the trolley in both directions, providing flexibility and control in positioning the load.

Load Positioning: The trolley can move the load across the length of the crane's beam, allowing operators to place loads in precise locations, often over long distances. This is especially useful for tasks such as loading and unloading materials from trucks or containers.

Horizontal Movement: The trolley traveling mechanism enables the crane to move the hoist horizontally along the beam or girder of the crane. This allows the crane to position the load accurately over a specific area.

Crane wheel

A crane wheel is an essential component of a Fixed Gantry Crane, which is a type of crane used for lifting and transporting heavy loads. The crane wheel is specifically designed to allow the gantry crane to move along a track or rail system, either within a fixed area or along a specific route.

1) Function of wheels

The wheels are designed to run along specific rails or tracks, which can be fixed to the ground or part of a larger moving system. The track's design must match the wheel's size and alignment for optimal performance.The crane wheels help evenly distribute the weight of the gantry crane and the loads it carries, ensuring stability during lifting and travel.

2) Design requirements

These wheels are designed with a strong tread surface to ensure traction and smooth movement along the crane rail system. The design often includes grooves to help maintain the alignment of the crane on the track.The crane wheel is typically made from high-strength steel or alloy material to withstand the heavy loads and continuous stress during operation.Crane wheels come in various sizes depending on the crane's load capacity and the specific application. Larger wheels are used for higher-capacity cranes and longer travel distances.

7.Crane Hook

The crane hook of a fixed gantry crane plays a crucial role in lifting and moving loads.The hook is typically made from high-strength steel to withstand the load-bearing forces during lifting operations.It is designed with a curved shape to securely hold the load by either a chain, rope, or sling.It may have a latch or safety mechanism to prevent the load from slipping off during lifting.

A fixed gantry crane has a stationary or rigid structure that supports the crane's lifting mechanisms. The crane hook is mounted at the end of a trolley, which moves along the crane's horizontal track.The crane hook's position is controlled by a hoisting mechanism, allowing it to raise and lower loads at specific locations.

The crane hook is designed to lift heavy materials such as construction beams, containers, or other large items.It works in conjunction with the crane's hoist, which raises and lowers the hook, allowing it to precisely handle and position heavy loads.

A latch or safety pin may be incorporated into the crane hook to prevent the load from disengaging during movement.Anti-rotation features may also be present to ensure the hook does not spin or swing uncontrollably.

Motor

The motor of a fixed gantry crane plays a crucial role in driving the crane's movements. Fixed gantry cranes are large, heavy-duty machines typically used for lifting and transporting materials over fixed, defined areas. These cranes consist of a hoist, trolley, gantry, and a motorized drive system.

The motors in a fixed gantry crane are typically electric motors.Common types include AC induction motors for simplicity, efficiency, and reliability, or DC motors for more precise speed control.Typically, the motor is located on the crane's trolley, or sometimes on the gantry frame, depending on the crane's design.

The motor powers the hoist, which is responsible for lifting and lowering the load.The motor drives the trolley (for horizontal movement) along the rail system.Some gantry cranes, particularly those with rotating capability, use motors to rotate the crane structure (if applicable) for precise load positioning.The motor's power is determined by the weight capacity of the crane. Larger gantry cranes, designed for heavier loads, will use more powerful motors.The motor's speed can be controlled using variable frequency drives (VFDs), allowing precise movement control.

The motor of a fixed gantry crane is the key component that drives the lifting, movement, and positioning of heavy loads. The type and power of the motor depend on the crane's design and operational requirements, and proper motor maintenance is essential for safe and efficient crane operation.

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Sound and light alarm system & limit switch

1) Sound and light alarm system

A sound and light alarm system for a fixed gantry crane is an essential safety feature that ensures the well-being of workers, nearby equipment, and the surrounding environment. Such systems are designed to alert personnel of potential hazards, operational status, or malfunctioning of the crane.

Sound Alarms (Audible Signals):Buzzers/Alarm Horns: High-decibel sound emitters alert people about specific conditions (e.g., crane movement, lift in progress, emergency shutdown).Alarm Tones: Different sounds can correspond to different situations (e.g., continuous siren for an emergency, intermittent beep for general operation).Volume Control: Ensures the alarm is audible across the worksite, even in noisy environments.

Light Signals (Visual Indicators):Flashing Lights: High-intensity flashing lights (typically red, yellow, or green) are used to visually signal the crane's operation status. For example:

Red Flashing Light: Indicates emergency or dangerous conditions.

Yellow Flashing Light: Signals that the crane is in operation or moving.

Green Light: Can indicate that the crane is idle or that it is safe to approach.

2) Limit switch

A limit switch on a fixed gantry crane is a safety device used to prevent the crane's movement from exceeding a predetermined limit. It helps ensure that the crane's components (like the hoist, trolley, or gantry) do not move too far in any direction, preventing mechanical damage, accidents, or unsafe operations.

Functions of the Limit Switch:Position Limiting: The limit switch detects when the crane's trolley, hoist, or gantry has reached the end of its travel range and cuts off power to prevent further movement.Safety: It acts as a fail-safe mechanism to prevent the crane from operating outside safe boundaries.Prevents Overtravel: Ensures that the crane's lifting mechanism does not go beyond the safe limits, avoiding damage to the crane or load.Load Protection: Prevents the crane from lifting or lowering a load too far, ensuring load integrity and preventing accidents.

Mechanical Limit Switches: These are physically actuated by the movement of the crane parts. They can be either roller-type, lever-type, or plunger-type switches.Electrical Limit Switches: These use sensors or electrical circuits to detect the position of the crane components.

10.Safety Devices

1) Overload protection device:Prevents the crane from lifting loads that exceed its rated capacity, reducing the risk of structural failure or tipping.

2) Limit Switches (Travel and Hoist Limits):Ensures that the crane's trolley, hoist, or gantry does not move beyond a certain predefined position, preventing damage to the crane structure or surrounding equipment.

3) Emergency Stop Button: Provides an immediate means to stop the crane in case of an emergency.

4) Anti-Sway Control: Minimizes the swaying or swinging of the load, which can lead to accidents or damage.

5) Load Moment Indicator (LMI):Provides real-time data on the crane's stability by measuring the moment or force exerted by the load.

6) Horn and Warning Lights: Alert workers in the vicinity of the crane to its operation, especially when it's moving heavy loads or in restricted areas.

11.Control Mode

1) Manual control: The crane is operated manually by an operator using a control panel or joystick to control the movements of the crane. This is the simplest mode, where the operator has direct control over the hoist, trolley, and gantry motion.

2) Semi-Automatic Control:The crane can be operated in semi-automatic mode where certain movements (such as hoisting or trolley movement) are automated, but the operator still has some manual control over other functions.

3) Fully Automatic Control:In fully automated mode, the crane is controlled by an onboard computer system, with minimal or no human intervention. These systems can manage complex lifting, loading, and unloading operations based on pre-programmed instructions or real-time sensor data.

4)Radio Remote Control: This mode allows the crane to be controlled remotely using a handheld radio transmitter. It provides flexibility for operators to work from different points, improving safety and productivity in environments where the crane is operating over large or hazardous areas.

5) Joystick Control:This is often used in manual or semi-automatic modes, where the operator uses a joystick to control the crane's movements. It allows for precise control of the lifting load, especially for tasks requiring fine movements or in restricted spaces.

 

12.Sketch

 

 

 

Main technical

 

 

 

Advantages of 15-ton Double Girder Rail Mounted Gantry Crane

Strong Load Capacity

The double-girder structure allows the crane to handle 15 tons safely and steadily, making it ideal for moderately heavy lifting tasks across various industries.

High Structural Stability

With two girders, the crane offers better load distribution, higher rigidity, and minimized structural deformation, even during intensive operations.

Wide Span and Large Coverage

Rail-mounted design enables long spans and wide work areas, allowing efficient movement of loads over large outdoor or semi-outdoor spaces.

Efficient Three-Dimensional Movement

Provides full movement along three axes - up/down (hoisting), left/right (trolley movement), and forward/backward (crane travel) - for flexible and precise handling.

Enhanced Safety

Equipped with comprehensive safety features, including overload protection, limit switches, emergency stop functions, and windproof anchoring for outdoor use.

Energy-Efficient and Smooth Operation

Modern drive systems (such as Variable Frequency Drives, VFDs) allow for smooth acceleration and deceleration, reducing energy consumption and mechanical wear.

Customizable Design

Span, lifting height, working speeds, and control modes (cabin, pendant, remote) can be tailored to specific project or site requirements.

Reduced Labor and Faster Handling

Mechanized lifting significantly cuts down manual labor needs and speeds up material handling processes, leading to better productivity.

Durable and Low Maintenance

Made with high-quality steel structures, weather-resistant paint, and reliable electrical systems, ensuring long service life with minimal maintenance requirements.

Cost-Effective for Medium-Duty Applications

Compared to heavier cranes like 100-ton models, a 15-ton crane provides excellent performance for medium-duty applications at a much lower total cost (purchase, installation, and maintenance).

 

 

Applications of 15-ton Double Girder Rail Mounted Gantry Crane

Steel Fabrication Yards

Handling steel plates, beams, pipes, and assembled structures.

Assisting in production and assembly processes for industrial components.

Precast Concrete Plants

Lifting and transporting precast concrete elements like slabs, columns, beams, and wall panels.

Supporting storage and loading operations.

Logistics Centers and Warehouses

Moving heavy pallets, large equipment, and packaged goods.

Facilitating the loading and unloading of trucks or rail wagons.

Construction Sites

Lifting and positioning construction materials such as steel frames, rebar bundles, and prefabricated building modules.

Used in bridge construction, industrial building erection, and infrastructure projects.

Machinery Manufacturing Plants

Handling medium-weight machine parts, molds, and heavy assemblies.

Supporting production lines and assembly workshops.

Railway Yards

Moving rails, sleepers (railroad ties), and maintenance equipment.

Used for building or repairing rail tracks and components.

Shipyards and Marine Terminals

Assisting in handling medium-sized components like marine engines, ship sections, and shipbuilding materials.

Moving equipment and cargo in port operations.

Mining and Mineral Processing

Handling heavy parts and maintenance equipment for mining machinery.

Transporting materials like pipes, maintenance frames, and tooling.

Energy Sector

Used in wind power, hydroelectric, and thermal power projects to move medium-sized generators, turbines, and transformers.

Supports plant maintenance and assembly work.

Aerospace and Defense

Handling structural parts for aircraft assembly and maintenance.

Moving heavy aerospace components requiring precise positioning.

 

 

Specification Requirements: Understand the specific requirements for the crane, such as load capacity, span, lifting height, and environmental factors (indoor/outdoor, temperature, etc.).Structural Design: Design the crane structure, including the gantry frame, lifting mechanism, and foundation, using CAD software to ensure strength, stability, and safety.Mechanical Design: Design the trolley, hoist, and other mechanical systems required for crane operation.Electrical Design: Design the electrical components, including control panels, motors, and safety systems.

Steel Plates and Sections: High-quality steel is ordered for the crane's structural components (columns, beams, etc.).Motors and Components: Motors for the trolley, hoist, and other control systems are procured from suppliers.Welding Electrodes, Bolts, and Fasteners: Necessary consumables for welding and assembly.Control Systems: Electrical components such as switches, relays, and sensors are acquired for the crane's control systems.

Cutting and Shaping: Steel plates and sections are cut to the required dimensions using cutting machines, plasma cutters, or water jets.Welding: The steel components are welded together to form the gantry structure. This is done in parts: the base frame, legs, cross beams, and other elements.Machining: If necessary, machining operations (drilling, milling) are performed on parts to ensure accurate fitments.Surface Treatment: Components are cleaned and treated (such as shot blasting and painting) to prevent rusting and improve durability, especially if the crane will be used in outdoor environments.

Assembling the Gantry Frame: The base, legs, and cross beams are assembled into a complete gantry structure. This step may take place in a large workshop or on-site, depending on the crane's size and location.Mounting the Rails: The tracks for the crane's trolley are mounted onto the gantry beams. This is crucial for ensuring smooth operation.Hoist and Trolley Installation: The hoist, motor, and trolley assembly are mounted onto the rails. The hoist mechanism is integrated with the lifting chain or rope, and the motor is connected to the drive system.Electrical Installation: Wiring, control panels, switches, and safety systems are installed, ensuring the crane can be operated remotely and safely.

Mechanical Testing: Verify all mechanical systems are operating correctly, including the hoist, trolley, and gantry movement.Electrical Testing: Check the electrical components for functionality, including the control system, motors, and emergency stop features.Load Testing: Perform load testing to ensure the crane can lift the specified capacity without issues. This may involve loading the crane with test weights and running it through various motions.Safety Features Check: Ensure all safety systems, including limit switches, overload sensors, and emergency braking, function properly.

On-site Assembly (if necessary): For large cranes, parts may be transported to the installation site, where final assembly and setup are done.Final Adjustments: Any adjustments to the crane's alignment, wiring, or safety systems are made as necessary. Operator Training: If needed, operators are trained on how to use the crane safely and effectively, covering operation, maintenance, and safety procedures.

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%.