Trussed Gantry Crane

 

A trussed gantry crane is a type of overhead crane that features a truss structure, typically used in heavy-duty lifting and material handling applications. The trussed design, as opposed to a solid frame, offers a combination of strength and reduced weight, providing better efficiency and cost-effectiveness.

A Trussed Gantry Crane is a highly efficient lifting solution designed for heavy lifting tasks in a variety of industrial settings. Featuring a robust truss frame construction, this crane is capable of handling large and heavy loads while maintaining stability, strength, and durability in demanding work environments.

The crane's frame is designed with a truss construction, which allows for a lighter structure while still maintaining high load-bearing capacity.The trussed design enhances stability and reduces material costs.These cranes are built to handle heavy loads, often used in environments such as shipyards, railways, construction sites, and factories.Load capacities can vary, ranging from several tons to hundreds of tons, depending on the application.

Trussed gantry cranes can be used for a wide range of tasks, from lifting large components and equipment to moving materials over long distances.They can be designed with adjustable spans, lifting heights, and specialized hoisting mechanisms to meet specific requirements.

The truss frame minimizes the risk of deformation, making it ideal for outdoor use in challenging conditions like wind or seismic activity.Trussed gantry cranes can be either fixed or mobile, offering flexibility in various applications.Mobile versions often come with wheels or rails for easy transportation across large areas, which is particularly beneficial in construction or shipbuilding yards.

Core Components :Gearbox, motor, Gear

Place of Origin: Henan, China

Warranty :1 Year

Weight (KG): 10000 kg

Video outgoing-inspection: Provided

Machinery Test Report: Provided

Application :Outdoor, workshop, etc.

Color : Customer Requirements

Main electrical parts : Schnider, SIMENS or as request

Duty Class : A3-A8

Speed: Single speed, double speed , or stepless speed

Temperature : -25°C~+40°C

Motor : Chinese famous brand or ABM

Voltage: 380V, 50Hz, 3-phase AC or as request

Control way: Pendent control, radio control, cabin control

Lifting mechanism : Electric winch

 

 

1.Main beam

The main beam of a trussed gantry crane is a critical structural component that forms the primary horizontal support for the crane's lifting mechanism. It is designed to carry the loads from the hoist, trolley, and any additional loads that the crane is lifting, as well as the forces from the crane's movement.

The main beam is often made up of a trussed structure, which means it has a triangular framework for strength and rigidity.Trusses are usually composed of steel beams or other high-strength materials, designed to efficiently distribute the load and minimize material use while maximizing strength.

The main beam is commonly constructed from steel, though other materials like aluminum may be used for lighter-duty cranes.Steel is favored for its durability, strength, and ability to withstand heavy loads.

 

Lifting System

The lifting system of a trussed gantry crane consists of several key components that work together to lift and move heavy loads. Trussed gantry cranes are commonly used in construction, manufacturing, and heavy industries, providing a stable structure for lifting operations.

Hoist Mechanism：The hoist is the primary lifting device on the gantry crane. It includes a drum or spool that holds the lifting rope or cable, which is wound or unwound to raise or lower the load.The hoist mechanism typically includes an electric motor that drives the drum and a system of gears and brakes to control the lifting speed, stop positions, and load stability.Some gantry cranes may feature hydraulic hoists for certain applications requiring precise lifting capabilities.

Lifting Trolley：The trolley is a movable part of the crane that carries the hoist along the length of the gantry. It is typically mounted on a rail system that runs parallel to the gantry structure.The trolley can move along the horizontal plane, allowing the hoist to cover the entire length of the crane span. This gives the crane its range of motion to lift loads in different positions.

Hook or Lifting Attachment：At the end of the hoisting rope or cable is a hook, lifting beam, or other attachment device. The hook is used to connect to the load being lifted.The hook is often designed to rotate or swivel to ensure proper load handling and to minimize the risk of load misalignment or damage during lifting.

Motors and Controls：The hoist motor and trolley motor are typically electric and controlled via a control panel or remote control.The control system allows the operator to adjust the lifting speed, movement of the trolley, and even fine-tune the load position, ensuring smooth and safe operations.

Steel Cables or Chains：The lifting mechanism is powered by steel cables or chains that carry the load. These cables are strong enough to support heavy weights but also need regular maintenance to prevent wear, fraying, or damage.

 

3.End carriage

The end carriage of a trussed gantry crane is a key component of the crane's structure that supports the crane's wheels and allows it to move along the rails. Trussed gantry cranes are typically used for heavy lifting applications, such as in shipyards, construction sites, or large industrial settings.

Frame Structure: The end carriage has a trussed frame, which is designed to support the weight of the crane and the load being lifted. This frame is usually made from welded steel to ensure strength and rigidity.

Wheels: The end carriage includes wheels (typically rubber-tired or steel wheels) that run along a track or rail. These wheels are powered either manually or by a motor, depending on the design of the crane.

Drive Mechanism: In many trussed gantry cranes, one or both end carriages may be powered by a motor, which drives the wheels to move the crane along its track. This can be accomplished with electric motors and gear systems.

Bearings and Axles: The wheels are mounted on axles, and the bearings ensure smooth movement along the rails. Proper lubrication and maintenance of these components are essential for optimal performance.

Braking System: End carriages typically include brakes to stop or slow down the movement of the crane. These brakes could be mechanical, hydraulic, or electrical, depending on the crane's design.

Functions of the End Carriage:

Mobility: The end carriage allows the gantry crane to travel along the rails, positioning the crane over different parts of a work area.

Stability: It provides the necessary stability for the crane to function under heavy loads.

Load Distribution: It plays a crucial role in distributing the load across the crane structure, ensuring safety during operation.

 

4.Crane travelling mechanism

The traveling mechanism of a trussed gantry crane consists of the motor, gearbox, end carriages with wheels, and the tracks. The system provides the necessary movement for the crane to traverse long distances, allowing it to position itself over the load and transport it efficiently. The design of the traveling mechanism must take into account factors such as load weight, speed, track layout, and environmental conditions.

The traveling drive system consists of the motor, gearbox, and associated components that convert rotational energy into linear motion to move the crane.

Wheel rotation driven by the motor allows the crane to travel along the rails, with the speed controlled by the motor's output.

The rails are mounted on the ground or elevated structure, depending on the application. The crane moves along these rails, typically using a standard railway track design or custom-built industrial tracks.The tracks must be level and aligned to ensure smooth travel and prevent undue wear or malfunction.The wheels or rollers are mounted on the end carriages. They are typically made of steel and are designed to run along the rails or tracks.The design of the wheels often includes flanges to ensure they stay aligned on the tracks during crane movement.

The traveling mechanism is powered by electric motors, typically AC motors or DC motors, that drive the movement of the crane along the rails or track system. The motors are mounted on the crane's end carriages or on the main gantry frame, depending on the design.The motors are connected to gearboxes that reduce the motor speed to an appropriate value for crane travel.

 

5.Trolley travelling mechanism

Key Components:

Trolley:The trolley is the part that moves horizontally along the crane beam. It supports the hoist or load-lifting device.It can move from one end of the gantry crane to the other, allowing the crane to cover a wide working area.

Travelling Rails (or Track System):The trolley travels along a pair of parallel rails or tracks mounted on the crane's cross beam.The rails can either be part of the crane structure itself or an external track system, depending on the design.

Motors and Drives:Electric motors or sometimes hydraulic systems power the trolley's movement.The motor is usually connected to a gear system, such as a reduction gear or drum drive, to provide controlled movement.The motor could drive wheels mounted on the trolley or directly on the track, depending on the design.

Wheels and Bearings:The trolley typically moves on wheels, which are mounted on the rails.These wheels are made from high-strength materials (such as steel) to handle the weight and wear during operation.Bearings reduce friction and allow smooth movement.

Control System:The trolley travelling mechanism is controlled either manually or automatically, with a remote control or a local operator cabin.

Working Principle:

The trolley is moved by the drive system, which is usually powered by an electric motor. The motor transfers power to the trolley's wheels, which are mounted on tracks or rails.The trolley is guided by the rails along the crane's beam, enabling precise positioning over a large area.The movement of the trolley is controlled by the crane's operator, who can regulate speed and direction using a control pendant or remote.In a trussed gantry crane, the added strength of the trussed frame helps support the heavy load and provides stability during the trolley's operation.

 

 

6.Crane wheel

A crane wheel for a single girder truss type gantry crane is a critical component in the crane's movement mechanism.

Typically made from high-strength materials like forged steel (e.g., 42CrMo or 45# steel) for durability and resistance to wear and tear.

The wheel tread is designed to match the rail specifications, ensuring smooth and efficient movement. Common profiles are flat or slightly crowned to reduce wear. The wheels often have flanges to guide the crane along the rails and prevent derailment.Heat-treated for hardness and resistance to deformation under heavy loads.

7.Crane Hook

A crane hook in a trussed gantry crane is an essential component used for lifting and moving heavy loads.

Purpose and Function

The crane hook connects the lifting mechanism (like a wire rope or chain) to the load being lifted.It ensures a safe and efficient transfer of the load.

Design

Typically made of high-strength forged steel or alloy steel for durability and safety.Comes in various shapes: single hook for lighter loads or double hook for heavier loads.

Features

Rotational Capability: Some crane hooks can rotate to provide flexibility during operations.

Safety Latch: Prevents the load from slipping off the hook.

Load Capacity: The size of the crane hook is determined by the crane's maximum lifting capacity.

Standardization: Hooks are manufactured according to international standards like DIN, ISO, or ASME.

Motor

The motor of a trussed gantry crane is a critical component that drives the crane's movement and lifting operations. Trussed gantry cranes are often used for outdoor applications, where lightweight and high-strength designs are essential.

Motor Types

Hoisting Motor: Powers the hoist mechanism to lift and lower the load.

Trolley Motor: Moves the hoist along the girder (cross travel).

Travel Motor: Drives the entire crane along the rails (long travel).

Specifications

Power Rating: Depends on the crane's load capacity (e.g., 5-ton, 10-ton, etc.). Larger capacities require higher-powered motors.

Voltage: Commonly 380V/400V AC, three-phase for industrial use.

Speed: Variable speed motors (with inverters) are often used for smooth operation.

Duty Cycle: Generally high-duty motors, rated for continuous or intermittent operation.

Protection: Motors usually have an IP55 or higher rating for dust and water protection, especially for outdoor cranes.Features

High Efficiency: Designed to handle heavy-duty operations while conserving energy.

Durability: Built to withstand harsh environments and fluctuating weather conditions.

Low Maintenance: High-quality motors require minimal maintenance and offer long service life.

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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 trussed gantry crane is designed to enhance safety by providing both audible and visual warnings in case of potential hazards or malfunctions. These alarms can help operators, maintenance personnel, and bystanders stay aware of crane operations, reducing the likelihood of accidents.

Sound Alarm (Audible Warning)

Horn or Siren: A loud horn or siren is used to alert operators and nearby personnel of dangerous or critical situations. It is designed to be heard over the normal operating noise of the crane and surrounding environment.

Types of Sounds: Different sounds can be used for various conditions-continuous for immediate danger, intermittent for a warning or caution, or a series of beeps to indicate the crane is nearing a specific limit.

Volume Control: The sound level should be adjustable and loud enough to be heard from a significant distance, especially in noisy industrial environments.

Light Alarm (Visual Warning)

Flashing Lights: These are typically mounted on the crane or nearby structures. They flash or blink in varying patterns (e.g., strobe or rotating lights) to visually signal a warning or danger.

Color Indicators: Different colors are used to signify different warnings:

Red: Critical alarm, immediate stop or action required.

Yellow/Amber: Warning or caution (e.g., overload, nearing end of travel limit).

Green: Safe condition or operational status (could be used for operational confirmation or when the crane is in a standby condition).

2) Limit switch

A limit switch in a trussed gantry crane is a safety and operational device used to control and monitor the movement of the crane, ensuring it operates within safe boundaries. It is typically mounted at the end of the travel path of the crane, either on the horizontal (lateral) or vertical movement axes, to prevent the crane's moving parts from going beyond their designed limits.

Key Functions of the Limit Switch in a Trussed Gantry Crane:

Horizontal Travel: The limit switch can stop the crane's trolley from moving beyond the safe travel limit along the rail system.

Vertical Travel: It ensures the hoisting mechanism doesn't exceed its safe range, preventing over-lifting or over-lowering of the load.

Safety Mechanism:If the crane is nearing the end of its travel path (either in the horizontal or vertical direction), the limit switch is triggered, activating the brake system or cutting off power to the motors to stop further movement. This prevents the risk of mechanical failure or damage.

Automation & Control:Limit switches can be integrated into the crane's control system to automatically stop the crane at preset positions, helping to maintain precision during operations.

Preventing Collisions:In cranes with multiple moving parts (e.g., hoist, trolley, bridge), the limit switch can ensure that no part of the crane collides with another by stopping movement at critical points.

10.Safety Devices

1. Overload Protection Device

Prevents the crane from lifting a load heavier than its rated capacity, which could cause structural damage or failure. It typically includes load cells or a weight sensor that triggers an alarm or stops the crane when the load exceeds safe limits.

2. Limit Switches

These devices are used to stop the movement of the crane when it reaches its maximum or minimum travel limits.They can be installed on the hoist, trolley, and bridge to ensure the crane doesn't exceed its operational boundaries.

3. Emergency Stop Button (E-Stop)

Provides an immediate stop to the crane in the event of an emergency.Typically placed on the crane control panel and at strategic points on the crane for quick access.

4. Safety Hooks and Latches

These mechanisms prevent the load from accidentally detaching from the crane hook during operation. Latches or automatic safety hooks that engage when the load is securely attached.

5. Wind Speed Indicators

Measures the wind speed around the crane. In high winds, especially when lifting heavy loads, it can trigger a warning or stop operation to prevent accidents. Commonly used in outdoor gantry cranes, especially for large or exposed construction sites.

6. Over-travel Protection

Prevents the crane from traveling beyond its safe range of movement.Limit switches or sensors that stop the motion of the crane if it goes beyond its designated travel area.

7. Brake System

The crane's braking system ensures that it stops safely during operation or in case of an emergency.This includes emergency brakes, parking brakes, and holding brakes that engage when the crane is not in use.

8. Anti-sway System

Prevents the load from swinging excessively during lifting or traveling.Includes sensors and control systems that adjust the crane's speed or movement to reduce sway.

9. Crane Monitoring Systems

Advanced systems monitor key parameters of the crane, such as load weight, speed, and operating status.These systems can provide alerts, generate reports, and ensure that the crane operates within safe limits. Some systems can automatically shut down the crane if unsafe conditions are detected.

 

11.Control Mode

1. Manual Control Mode

In manual mode, the crane is operated by an operator using a handheld control pendant or a joystick. The operator controls all movements of the crane, including hoisting, lowering, traveling, and swiveling.

2. Semi-Automatic Control Mode

Semi-automatic mode is a combination of manual control and automated features. The operator can control certain movements manually, but the crane may also be able to perform some functions autonomously (e.g., traveling along predefined routes).

3. Automatic Control Mode

In automatic mode, the crane operates with minimal input from the operator. Pre-programmed instructions or a computer system control the crane's movements, and sensors can be used to guide the crane and avoid obstacles. The system might use advanced technologies like GPS or laser guidance.

4. Remote Control Mode

A remote control mode uses a wireless controller to operate the crane from a distance. This mode is typically used for cranes that need to be operated from a safe distance or where manual control from a fixed position is not feasible.

5. Driverless (Autonomous) Control Mode

In this mode, the crane is fully autonomous. It uses a combination of sensors, AI, and machine learning to navigate the worksite and perform tasks like loading, unloading, and traveling with no human intervention. This is most common in fully automated ports or large industrial complexes.

6. PLC (Programmable Logic Controller) Control

PLC-based control involves a centralized controller that integrates various inputs (sensors, buttons, switches) to automate the crane's movements based on pre-set commands or inputs from the operator. It may be part of an industrial automation system.

12.Sketch

Main technical

 

 

1. Increased Load Capacity: The trussed design is more robust and can support heavier loads compared to conventional solid-frame cranes. This is especially beneficial for lifting large, heavy, or bulky materials.The trussed design effectively distributes the weight and forces across the structure, allowing for higher load-bearing capacities.

2. Reduced Weight of Crane: Trussed cranes use less material than solid-frame cranes for the same strength, making them lighter. This reduction in weight can lead to.lower operational loads on the foundation and tracks, as well as reduced overall construction costs.

3. Improved Stability: The triangular shape of the trusses offers superior resistance to lateral (sideways) forces, such as wind or seismic loads, which enhances the crane's overall stability.The trussed structure is less likely to deform under extreme stress, contributing to the crane's long lifespan.

4. Cost-Effective: Trussed gantry cranes typically require fewer materials to achieve the same strength, resulting in reduced material costs. This makes them a more cost-effective choice for large-scale or heavy-duty applications.The design and strength of trussed gantry cranes also result in less wear and tear, leading to fewer repairs and maintenance over time.

5. Flexibility in Design and Application: Trussed gantry cranes can be designed with different spans and heights to fit specific operational needs, whether it's for container handling, construction, or other specialized tasks.The structure's resistance to environmental factors like high winds or seismic activity makes trussed gantry cranes ideal for use in difficult conditions.

6. Efficient Space Utilization: Trussed gantry cranes are typically designed with an open, clear span, offering more usable space beneath the crane for movement of materials and machinery.

 

 

1. Shipbuilding and Shipyards

Heavy lifting of ship parts: Trussed gantry cranes are used to transport large, heavy ship components, such as hull sections, engines, or other components, across different areas of a shipyard.

Launching and dry-docking ships: The cranes are also essential for moving ships in and out of dry docks, helping with the maintenance or construction of vessels.

2. Construction Sites

Heavy materials handling: Trussed gantry cranes are used in construction to lift heavy materials like steel beams, concrete panels, or large machinery and equipment.

Precise positioning: These cranes are ideal for placing construction materials in difficult-to-reach areas.

3. Steel Mills and Foundries

Material handling: Trussed gantry cranes help move heavy steel slabs, ingots, or molten metal ladles within steel mills or foundries.

Support for loading/unloading: They are often used to load raw materials into furnaces and unload finished products.

4. Railway and Transport Yards

Rail car maintenance: In transport yards, trussed gantry cranes can be used for lifting and maintaining railway cars or containers, especially in large rail freight yards.

Load and unload freight: These cranes can also handle containers in container terminals, facilitating the loading/unloading of cargo from trains to trucks.

5. Power Plants

Generator and turbine handling: Trussed gantry cranes are often used in power plants for moving large components such as turbines, generators, or heavy electrical equipment.

Plant maintenance: During plant shutdowns, these cranes help remove and replace large parts for maintenance or upgrades.

 

 

1. Design and Engineering

The process begins with understanding the specifications and requirements, such as the crane's load capacity, span, lifting height, and operating environment (indoor or outdoor).Engineers perform a detailed structural analysis to determine the required materials and dimensions for the crane's components, including the truss beams, legs, and cross members.Create CAD drawings for all crane components, including the gantry frame, lifting mechanism, electrical systems, and any other specialized features.Ensure the design meets local safety standards and international crane standards (such as EN 13001 or ISO 4301).

2. Material Procurement

Based on the design, materials are sourced, typically steel plates, I-beams, truss elements, and steel bars for the crane structure. High-quality materials are essential to ensure the crane can handle the specified loads.Other parts such as wheels, electrical components, motors, gearboxes, and control systems are procured from suppliers.

3. Fabrication of Components

Raw materials are cut into specified shapes and sizes. For the trussed gantry crane, the truss beams will be cut and shaped to form the main structural components.The individual steel pieces are welded together to form the trusses, gantry frame, and other structural parts. Special attention is given to ensuring the welds are strong and meet quality standards. Some components may require additional machining, such as drilling holes for bolts or attaching mounting points for wheels and motors. The fabricated parts are often treated to prevent corrosion, such as through hot-dip galvanizing or painting.

4. Assembly of the Crane

The trussed frame is assembled by joining the main structural elements, such as the top girder, lower girder, and truss supports.The legs are attached to the main frame. Depending on the crane design, these legs might be designed for adjustable height or for specific track configurations (rail-mounted or rubber-tired).Install the wheels on the gantry legs, ensuring they are aligned and able to move smoothly along the tracks or rail system.The hoisting system, which includes the hoist, trolley, and gantry crane motor, is installed on the crane structure.The electrical components, including wiring, motors, and control panels, are installed and integrated.

5. Testing and Quality Control

Before the crane is shipped or put into service, it undergoes load testing to ensure it can safely handle its maximum rated load. This may include lifting test loads and checking stability and performance.The crane's operational systems are tested, including the lifting mechanism, electrical controls, and movement along the tracks. Any issues with alignment or operation are corrected at this stage.Conduct thorough safety checks to ensure that emergency systems, limit switches, brakes, and other safety features function correctly.

6. Finishing and Packaging

If necessary, the crane is painted for aesthetic purposes or to provide additional corrosion resistance.Create operational and maintenance manuals, load charts, and compliance certificates for the crane.

Packing for Delivery: After final inspections, the crane is disassembled for shipping (if required), with parts carefully packaged for transport.

7. Installation and Commissioning

If not already assembled, the crane is reassembled on-site, often requiring a crane or other heavy lifting equipment for the final setup.The crane is tested on-site to ensure everything operates as intended, including load tests, functionality checks, and safety testing.

Operator Training: If required, operators are trained on how to use the crane safely, including how to perform maintenance tasks.

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%.