Clamshell Grab Bucket Bridge Cranes

 

The clamshell grab bucket bridge crane is a specialized type of  crane designed for efficient and precise handling of materials, particularly in bulk material handling operations such as foundries, recycling facilities, and ports. This crane is characterized by its grab attachment, which is used to pick up, transport, and release loose or bulk materials.

Product Features

Grab Attachment: The most distinctive feature of the clamshell grab bucket bridge crane is its grab attachment. This mechanism resembles a giant clamshell and is designed to scoop up and release bulk materials such as sand, grains, ore, and scrap metal.

Heavy-Duty Design: These cranes are built to handle heavy loads and operate in demanding environments. They typically have robust structures, powerful hoisting mechanisms, and durable materials to withstand the rigors of industrial use.

3.In summary, clamshell grab bucket bridge cranes are specialized equipment designed for efficient and safe handling of bulk materials in a range of industrial settings. Their robust construction, versatile mobility, and precision control make them invaluable tools for streamlining material handling operations.

 

 

Max. Lifting Height:30m

Warranty of core components:3 years

Warranty:2 Years

Weight (KG):10000 kg

Rated Lifting Moment:/

Max. Lifting Load:30ton

Span:10.5~31.5m

trolley travelling:40-50m/min

Lifting height:12m 16m 30m

Working System:A7-A8

Power Source：3 Phase 380V 50hz

Grab volume：2-12m3

Total power：36-152 Kw

1.Main beam

1The main beam of a clamshell grab bucket bridge crane is a key component that supports the lifting mechanism and carries the load during operation. This component is designed to withstand the weight and stresses of heavy lifting, ensuring the stability and safety of the crane.

2.Structure and Design

Material: The main beam is typically made of high-strength steel or other durable materials to withstand the weight of the load and the forces generated during lifting.

Cross-Section: The cross-section of the main beam is designed to distribute the load evenly across its surface, reducing stress concentrations and increasing its overall strength.

Beam Span: The span of the main beam determines the crane's lifting capacity and working range. The span can vary depending on the application, but it is typically between 20 meters and 60 meters.

Support Structure: The main beam is supported by a sturdy structure, including beams, columns, and girders, which provide additional support and stability.

3.In summary, the main beam of a clamshell grab bucket bridge crane is a critical component that determines the crane's lifting capacity, stability, and safety. Its design must consider factors such as material strength, cross-sectional shape, span length, support structure, and truss system to ensure that it can safely and efficiently handle heavy loads in various industrial applications.

 

Lifting System

The lifting system of a clamshell grab bucket bridge crane is responsible for hoisting and lowering loads, as well as controlling the opening and closing of the grab. This system is crucial for the crane's functionality and safety, as it directly interacts with the load being handled.

Components

Hoisting Motor: The hoisting motor provides the power needed to lift and lower the grab. It is typically an electric motor, though some older or specialized cranes may use hydraulic systems.

Drum(s) or Sheaves: The drum or sheaves are used to wind and unwind the wire rope, which in turn raises and lowers the grab. Drums are rotating cylinders around which the wire rope is wound, while sheaves are pulley-like wheels that guide the rope.

Wire Rope: The wire rope, also known as hoisting cable or hoist rope, connects the hoisting mechanism to the grab. It must be strong enough to handle the maximum load capacity of the crane.

Operation

Lifting: When the hoisting motor is activated, it rotates the drum or moves the sheaves, winding the wire rope and raising the grab.

Lowering: Reversing the motor's direction releases the wire rope from the drum or sheaves, allowing gravity to assist in lowering the grab.

Grab Control: The grab's opening and closing are controlled by a separate mechanism, often pneumatically or hydraulically powered, which is integrated into the crane's hoisting system.

3..In summary, the lifting system of a clamshell grab bucket bridge crane is a complex but essential assembly of components that work together to safely and efficiently handle heavy loads. Its design emphasizes strength, precision, and safety, making it a reliable tool for various industrial applications.

 

3.End carriage

1.The end carriage of a clamshell grab bucket bridge crane is the component that supports the crane's lifting mechanism and carries the load during operation. This component is typically located at the end of the crane's boom, providing a stable platform for the hoisting motor, drum, and other lifting components.

2.Structure and Design

Material: The end carriage is typically made of high-strength steel or other durable materials to withstand the weight and stresses of heavy lifting.

Cross-Section: The cross-section of the end carriage is designed to distribute the load evenly across its surface, reducing stress concentrations and increasing its overall strength.

Beam Span: The span of the end carriage determines the crane's lifting capacity and working range. The span can vary depending on the application, but it is typically between 20 meters and 60 meters.

Support Structure: The end carriage is supported by a sturdy structure, including beams, columns, and girders, which provide additional support and stability.

3.In summary, the end carriage of a clamshell grab bucket bridge crane is a critical component that determines the crane's lifting capacity, stability, and safety. Its design must consider factors such as material strength, cross-sectional shape, span length, support structure, and truss system to ensure that it can safely and efficiently handle heavy loads in various industrial applications.

4.Crane travelling mechanism

1.The traveling mechanism of a clamshell grab bucket bridge crane is responsible for moving the crane along its rail or track, allowing it to cover a larger work area. This mechanism is crucial for positioning the crane accurately and efficiently, as it directly affects the crane's mobility and versatility.

2.Components

Travel Wheels or Bogies: The travel wheels or bogies are mounted on the bottom of the crane and run along the top of the crane rail or track. They support the weight of the crane and provide stability during movement.

Drive Unit: The drive unit consists of one or more electric motors that power the travel wheels or bogies. These motors can be mounted directly on the wheels or connected through gearboxes or shafts.

Gearbox: In some cranes, a gearbox is used to transmit power from the motor to the wheels, providing the necessary torque and speed reduction for smooth and controlled movement.

Operation

Moving: When the drive unit is activated, it turns the travel wheels or bogies, propelling the crane along the rail or track.

Steering: Some cranes have steering mechanisms that allow for precise positioning and alignment, ensuring accurate load placement.

Speed Control: The speed of the traveling mechanism can be adjusted based on operational needs and safety considerations.

3.In summary, the traveling mechanism of a clamshell grab bucket bridge crane is a complex but essential assembly of components that work together to provide the crane with mobility and positioning capabilities. Its design emphasizes reliability, safety, and efficiency, making it a valuable asset in various industrial applications.

5.Trolley travelling mechanism

1.The trolley traveling mechanism of a clamshell grab bucket bridge crane is responsible for moving the hoisting mechanism and grab along the bridge or beam of the crane. This allows the crane to position the grab accurately in both longitudinal and transverse directions, enhancing its versatility and efficiency.

2.Components

Travel Wheels: The travel wheels are mounted on the bottom of the trolley and run along the top of the crane's bridge or beam. These wheels support the weight of the hoisting mechanism and grab while allowing smooth movement.

Drive Unit: The drive unit typically consists of one or more electric motors that power the travel wheels. These motors can be mounted directly on the wheels or connected through gearboxes or shafts.

Gearbox: In some cranes, a gearbox is used to transmit power from the motor to the wheels, providing the necessary torque and speed reduction for controlled movement.

Operation

Moving: When the drive unit is activated, it turns the travel wheels, propelling the trolley along the bridge or beam.

Steering: Some cranes have steering mechanisms that allow for precise positioning and alignment, ensuring accurate load placement.

Speed Control: The speed of the trolley traveling mechanism can be adjusted based on operational needs and safety considerations.

3.In summary, the trolley traveling mechanism of a clamshell grab bucket bridge crane is a crucial component that enables precise positioning of the hoisting mechanism and grab. Its design emphasizes reliability, safety, and efficiency, making it an essential part of the crane's operational capabilities.

6.Crane wheel

1.The crane wheel of a clamshell grab bucket bridge crane is a crucial component that allows the crane to move along its rail or track. These wheels are specifically designed to support the weight of the crane and its load while providing smooth and stable movement.

2.Design

Size and Shape: Crane wheels are typically large in diameter to ensure stability and evenly distribute the load over a wide area. The shape is usually circular with a thick rim and hub.

Material: Crane wheels are made from high-strength materials such as steel or cast iron to withstand the heavy loads and stresses during operation. The wheel surface may be hardened to reduce wear and tear.

Bearings: High-quality bearings are used in the wheel assembly to ensure smooth rotation and minimize friction. These bearings are critical for supporting the crane's weight and allowing it to move along the rail or track efficiently.

3.In summary, the crane wheel of a clamshell grab bucket bridge crane is a vital component that ensures the crane's mobility and stability. Proper design, material selection, and maintenance are crucial for safe and efficient crane operation.

 

7.Crane Hook

1.The crane hook of a clamshell grab bucket bridge crane is a critical component that connects the lifting cable or chain to the grab bucket. It plays a vital role in lifting, lowering, and moving the grab bucket to capture, transport, and release materials.

2.Design

Shape: The crane hook is typically designed with a curved shape, allowing it to securely attach to the grab bucket's lifting lugs or points.

Material: Crane hooks are made from high-strength materials such as steel or alloy steel to ensure they can withstand the heavy loads and stresses during operation.

Size: The size of the crane hook must be appropriate for the capacity of the crane and the size of the grab bucket. It should have sufficient strength to lift the maximum load without deformation or failure.

3.In summary, the crane hook of a clamshell grab bucket bridge crane is a crucial component that ensures the safe and efficient operation of the crane. Proper design, material selection, and maintenance are essential for reliable performance and the safety of personnel and equipment.

 

 

Motor

The motor of a clamshell grab bucket bridge crane is a critical component that provides the power necessary for hoisting and moving the grab bucket. The motor's primary function is to convert electrical energy into mechanical energy, which drives the crane's various mechanisms, including the hoisting mechanism and the trolley traveling mechanism.

Features of Crane Motors

Power: The motor must have sufficient power to lift and move the grab bucket and its load. The power requirement depends on the crane's capacity and operational demands.

Speed Control: Cranes require motors that can operate at different speeds for hoisting and lowering the grab bucket accurately and safely

Torque: The motor must provide enough torque to handle the initial load when starting to lift the grab bucket and its load.

Durability: Crane motors are designed to withstand the rigors of continuous operation in harsh environments. They must be robust and durable.

Efficiency: Efficient motors reduce energy consumption and operating costs.

In summary, the motor of a clamshell grab bucket bridge crane is a vital component that powers the crane's operations. Electric motors, especially those with adjustable speed drives, are commonly used for their efficiency and controllability. Proper maintenance is crucial for ensuring the reliable performance and safety of crane motors.

Sound and light alarm system & limit switch

1.The sound and light alarm system and limit switches are essential safety features of clamshell grab bucket bridge cranes. These components help to enhance the safety of the crane operators, surrounding personnel, and the equipment itself. Here's an overview of these two components：

2.Sound and Light Alarm System

The sound and light alarm system is designed to alert personnel in the vicinity of the crane about its operational status and potential hazards. This system typically includes visual and audible signals that are activated under certain conditions to improve safety and awareness.

3.Limit Switches

Limit switches are electronic devices used to detect the position of the crane's various moving parts and restrict their movement within safe limits. They play a crucial role in preventing physical damage to the crane and surrounding structures, as well as ensuring the safety of personnel.

Calibration to adjust the trigger points if necessary due to wear or adjustments in the crane's operation.

In summary, the sound and light alarm system and limit switches are vital safety features of clamshell grab bucket bridge cranes. They help to prevent accidents and ensure the safe operation of the crane by alerting personnel to potential hazards and restricting the crane's movement within safe limits. Proper maintenance and regular testing are essential to ensure these components remain effective and reliable.

10.Safety Devices

Load Cells and Load Meters

Used to measure the weight of the load being lifted, helping to prevent overloading and ensuring that the crane operates within its rated capacity.

Limit Switches

As mentioned earlier, limit switches are electronic devices that restrict the movement of the crane within predefined safe limits to avoid collisions, excessive hoisting, or dropping of the grab bucket.

Overload Protection Devices

These devices automatically stop the crane from lifting if the load exceeds the crane's maximum capacity, preventing structural damage and potential accidents.

Emergency Stop Systems

Consist of buttons or switches that can be activated in case of an emergency to immediately stop all crane movements. They are often red and easily accessible.

Sound and Light Alarm Systems

Alert nearby personnel with audible alarms and visual signals when the crane is in operation or in a potentially hazardous situation.

Anti-collision Systems

Designed to prevent the crane from colliding with other cranes operating in the same area or with obstacles in its path.

Travel Blocks

Physical stops or electronic limit switches that prevent the crane from traveling beyond the end of its rails or girders.

Brakes

Highly reliable mechanical or electronic brakes that secure the crane's hook, trolley, and bridge in position when not moving and can be applied in case of emergencies.

Interlocks

Devices that prevent unauthorized or unsafe operation of the crane by ensuring that certain operational sequences are followed.

Level Limit Indicators

Indicate whether the grab bucket is level when hoisting or lowering, reducing the risk of load spillage or imbalance.

11.Control Mode

Manual Control

In manual control mode, the crane is operated by human effort using levers, wheels, or push-button controls. This mode requires skilled operators who can manually control the hoisting, lowering, opening, and closing of the grab bucket, as well as the movement of the trolley and bridge. Manual control is less common in modern cranes due to the development of more advanced control systems.

Semi-Automatic Control

Semi-automatic control systems combine manual input with automated functions. The operator controls basic movements through switches or levers but complex actions like grab bucket opening and closing are automated. This reduces operator workload and improves efficiency and precision.

Fully Automatic Control

Fully automatic cranes are equipped with programmable logic controllers (PLCs) that automate most of the crane's operations. The operator inputs commands via a user interface, and the PLC executes the commands while ensuring safety and operational limits are maintained. This mode enhances productivity and consistency while reducing human error.

Remote Control

Remote control allows the operator to control the crane from a distance using radio signals or wired connections. This can be beneficial in environments where the operator needs to be distant from hazardous materials or conditions. Remote control can be either manual or automated.

Computer Control

Computer control systems use advanced software to manage the crane's operations. They can optimize the crane's performance based on parameters such as load characteristics and environmental conditions. Computer control systems often include user-friendly interfaces and can integrate with other industrial automation systems.

Joystick Control

Joystick control systems provide a more intuitive way for operators to control the crane. Similar to operating a video game controller, joysticks can be used for precise control of the grab bucket's movements and operations. This mode is commonly used in conjunction with other control systems like PLCs.

Wireless Control

Wireless control systems use radio frequencies to transmit commands from a remote control unit to the crane. This eliminates the need for physical connection cables between the control station and the crane. Wireless control can offer increased flexibility and mobility for the operator.

 

12.Sketch

 

 

 

1. Space-Saving

One of the most significant advantages of overhead cranes is their space-saving design. The crane operates by hanging from a beam or track installed on the factory or warehouse ceiling, which means it does not occupy valuable floor space. Compared to ground-based lifting equipment like forklifts, overhead cranes free up more floor space for other uses, improving overall spatial efficiency.

2. High Lifting Capacity

Overhead cranes typically have a high lifting capacity, able to lift heavy items ranging from several hundred kilograms to hundreds of tons. This makes them extremely suitable for use in heavy industries such as steel, construction, and shipbuilding.

3. Flexible Movement

Overhead cranes can move along a fixed track or beam, providing flexibility in moving loads within a specific area. They can transport goods from one place to another quickly and efficiently, especially in production lines where materials need to be moved between different processing stations.

4. Improved Working Efficiency

Using an overhead crane can significantly improve working efficiency. Once installed, operators can control the crane to quickly and准确地 move materials to the desired location, reducing manual handling and waiting times.

5. Reduced Labor Intensity

With an overhead crane, workers no longer need to manually lift heavy objects, reducing physical labor and the associated risks of injury. This not only protects worker health but also reduces potential safety incidents.

6. Low Maintenance Costs

Compared to other lifting equipment, overhead cranes have relatively simple structures and low maintenance costs. Regular inspections and timely replacement of worn parts can ensure long-term stable operation of the crane.

7. High Safety

Overhead cranes are typically equipped with various safety devices, such as overload protection, limit switches, etc. These devices ensure operational safety, preventing accidents due to overloading or out-of-range movement.

 

 

Versatility

Clamshell grab buckets can handle various types of loose materials efficiently. They are designed to grab, lift, transport, and release materials with minimal spillage, making them ideal for use in ports, mining operations, and other industrial sites where bulk materials need to be moved.

High Lifting Capacity

These cranes are capable of lifting heavy loads, typically ranging from a few tons to hundreds of tons. This makes them suitable for large-scale industrial operations where heavy materials need to be moved over significant distances.

Efficiency

The grab bucket's design allows for quick and precise grabbing of materials, which, combined with the crane's bridge movement, results in efficient operation. This efficiency translates into increased productivity and lower operational costs.

Reduced Labor Requirements

Automated control systems and advanced features minimize the need for manual labor, reducing the risk of workplace injuries and improving working conditions for operators.

Environmental Considerations

Clamshell grab bucket bridge cranes can help reduce environmental impact by minimizing dust emissions and spillage during material handling. Their enclosed grabbing mechanism helps contain materials effectively.

Space Saving

The bridge design of these cranes allows them to operate in a defined area above the material storage or processing site, saving space compared to ground-running equipment.

Improved Safety

Modern clamshell grab bucket bridge cranes are equipped with numerous safety features such as limit switches, emergency stop systems, and load meters that protect both the operators and the surrounding personnel and equipment.

Easy Maintenance

Many clamshell grab bucket bridge cranes are designed with maintenance in mind, featuring accessible components and modular designs that simplify inspection and repair work.

 

 

• 1. Design and Engineering

  Detailed Engineering: Develop detailed engineering drawings and specifications, including the main beam, hoist, trolley, end carriages, and other components.

  Simulation and Modeling: Use computer-aided design (CAD) and simulation tools to model the crane's performance and optimize its design.

   

• 2. Material Selection

  Material Specifications: Select high-quality materials that meet the requirements for strength, durability, and heat resistance. Common materials include high-strength steel, alloys, and specialized coatings.

  Procurement: Source materials from approved suppliers, ensuring they meet the necessary quality and certification standards.

   

• 3. Component Fabrication

  Cutting and Shaping: Cut and shape raw materials into the required components, such as beams, columns, and brackets. This may involve processes like plasma cutting, laser cutting, and machining.Welding and Assembly: Weld components together to form the crane's structural elements. This includes welding the main beam, end carriages, and other load-bearing parts.

   

• 4. Assembly

  Sub-Assembly: Assemble individual components, such as the hoisting system, trolley, and end carriages, into sub-assemblies. This involves fitting parts together and ensuring proper alignment.Main Assembly: Combine sub-assemblies to construct the complete crane structure. This includes mounting the hoist and trolley on the main beam, attaching the end carriages, and installing the control systems.

   

• 5. Integration of Systems

  Electrical Systems: Install electrical components, including motors, control panels, wiring, and sensors. Ensure that the crane's electrical systems are properly integrated and tested.

  Control Systems: Implement and configure control systems, such as programmable logic controllers (PLCs), remote controls, and safety devices. Verify that the control systems function correctly and are calibrated.

   

• 6. Testing and Quality Assurance

  Pre-Operational Testing: Conduct pre-operational tests to check the crane's functionality, including load testing, operational testing of the lifting and traveling mechanisms, and control system checks.

  Safety Testing: Verify that safety features, such as limit switches, alarms, and emergency stops, are working correctly and meet safety standards.

  Inspection: Perform a detailed inspection of the crane's structure and components to ensure compliance with design specifications and quality standards.

   

• 7. Final Adjustments and Calibration

  Fine-Tuning: Make any necessary adjustments to optimize the crane's performance and ensure smooth operation. This may include calibrating sensors, adjusting controls, and fine-tuning the lifting system.

  Documentation: Prepare and review documentation, including operation manuals, maintenance guides, and safety instructions.

   

• 8. Delivery and Installation

  Transport: Arrange for the transport of the crane to the installation site, ensuring that it is handled and shipped safely to prevent damage.

  Installation: Oversee the installation of the crane at the customer's facility, including assembly, alignment, and connection to power sources and control systems.

  Training: Provide training for operators and maintenance personnel to ensure they are familiar with the crane's operation and safety procedures.

   

• 9. Commissioning and Handover

  Commissioning: Conduct final commissioning tests to verify that the crane operates correctly under real-world conditions and meets performance specifications.

  Handover: Officially hand over the crane to the customer, providing all necessary documentation, including certificates of compliance, warranty information, and maintenance schedules.

 

 

 

 

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.

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