Customized Design 20 Ton 30 Ton Double Girder Gantr Crane  

Introduction

A Customized Design 20 Ton 30 Ton Double Girder Gantr Crane is a heavy-duty lifting solution designed for handling large and heavy materials like marble slabs, blocks, and other stone products. This type of crane is widely used in stone processing plants, quarries, warehouses, and construction sites where precise and safe material handling is required.

Key Features & Specifications

1. Lifting Capacity & Span

Capacity: 20 tons 30tons (can be customized for higher loads)

Span: Typically 10m to 30m (adjustable based on workspace requirements)

Lifting Height: 6m to 20m (customizable)

2. Structural Design

Double Girder Configuration: Provides higher strength and stability compared to single-girder designs.

Box-Type or Truss-Type Girders: Ensures rigidity and minimizes deflection under heavy loads.

End Carriages: Equipped with high-quality wheels for smooth travel along rails.

3. Hoisting Mechanism

Main Hoist: Electric wire rope hoist (e.g., 60-ton capacity with dual motors for reliability).

Auxiliary Hoist (Optional): Additional 5-20 ton hoist for secondary lifting tasks.

Lifting Speed: Adjustable (typically 0.5-8 m/min for precision handling).

4. Traveling Mechanism

Crane Travel: Motor-driven along rails (sealed for outdoor use if needed).

Trolley Travel: Smooth movement along the girders for precise positioning.

Control System: Variable Frequency Drive (VFD) for smooth acceleration/deceleration.

5. Safety & Control Features

Overload Protection: Prevents lifting beyond rated capacity.

Limit Switches: For hoisting and travel limits.

Emergency Stop: Instantly halts operations in case of danger.

Anti-Sway System (Optional): Reduces load swing for safer marble handling.

Remote Control / Cabin Operation: Flexible control options.

6. Applications

Marble & Granite Processing: Lifting and moving large stone blocks.

Quarries & Stone Yards: Loading/unloading raw marble slabs.

Warehouses & Factories: Transporting finished stone products.

Construction Sites: Installing heavy stone elements.

Advantages

✔ High Load Capacity – Suitable for heavy marble blocks.
✔ Sturdy & Durable – Reinforced steel construction for long-term use.
✔ Precision Handling – Smooth movement to prevent damage to marble.
✔ Customizable – Adjustable span, height, and speed based on needs.

Conclusion

The Customized Design 20 Ton 30 Ton Double Girder Gantr Crane is an ideal solution for the marble and stone industry, offering strength, reliability, and safety for heavy lifting operations. Its robust design and advanced controls ensure efficient material handling in demanding environments.

Would you like additional details on power supply, installation, or customization options?

 

Rated Loading Capacity：5 ton, 10 TON, 100 ton, customized, 16/3.2 ton, 20/5 ton, 32/5 ton, 50/10 ton

Max. Lifting Height：40m, customized

Span：35m or clients' demands

Warranty：1 Year

Weight (KG)：20000 kg

Core Components：PLC, Engine, Bearing, Gearbox, Motor, Pressure vessel, Gear, Pump

Control way：Cab, wireless remote control or customized

 

 

 

1.Main Structural Components

A. Girders (Bridge Beams)

Double Box Girders: Made of high-strength steel (Q235B/Q345B) for rigidity and minimal deflection.

Reinforced Welding: Ensures structural integrity under heavy loads (60+ tons).

End Connections: Bolted or welded to end carriages for stability.

B. End Carriages (Legs/Supports)

Steel Fabrication: Heavy-duty construction to support the girder and load.

Wheel Assemblies: Equipped with double-flanged wheels for smooth rail movement.

Buffers: Shock-absorbing devices to prevent collision impacts.

C. Cross Beams & Braces

Horizontal & Diagonal Bracing: Enhances crane stability during operation.

Anti-Deflection Design: Prevents girder bending under full load.

 

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Lifting Mechanism Components

A. Main Hoist (20-30-Ton Capacity)

Electric Wire Rope Hoist (e.g., 60-ton capacity with dual motors).

Drum & Rope System: High-grade steel wire rope (ISO-certified) with a durable drum.

Hook Block: Forged steel hook with safety latch for secure marble lifting.

B. Trolley (Hoist Carrier)

Trolley Frame: Moves along the girders via motorized wheels.

Travel Motors: Geared for smooth and precise positioning.

Braking System: Electromagnetic or hydraulic brakes for secure stopping.

C. Auxiliary Hoist (Optional, 5-20 Tons)

Secondary hoist for lighter loads or assisting in slab rotation.

 

 

 

3.End carriage

1.The end carriage of an industrial gantry crane is a critical component that connects the crane to the runway beam or rail on which it travels.

2.Here are the key features and functions of the end carriage:

Structure and Functionality

Rollers or Wheels: The end carriage typically has several rollers or wheels that ride along the top of the runway beam or rail. These are designed to minimize friction and allow for smooth movement of the crane.

Bearings and Axles: To support the weight and movement, the rollers or wheels are mounted on axles with bearings that ensure they can rotate freely without excessive wear.

Locking Mechanism: Some end carriages may include locking mechanisms that can secure the crane in a fixed position when not in use or during maintenance.

Adjustment Mechanisms: There may be adjustment mechanisms to fine-tune the alignment and ensure that the crane moves straight along the runway beam without deviation.

3.The end carriage is vital for the stable and reliable operation of the gantry crane. It ensures that the crane can move smoothly and efficiently along the runway beam, carrying out its hoisting and transporting functions with precision. Proper maintenance and inspection of the end carriage are crucial to prevent issues that could affect the crane's performance or lead to safety hazards.

4.Traveling Mechanism

A. Crane Travel (Longitudinal Movement)

Travel Motors: AC/DC motors with gearboxes for rail movement.

Rail System: Heavy-duty steel rails (QU80/QU100) for smooth travel.

Wheel & Axle Assembly: Heat-treated wheels for durability.

B. Trolley Travel (Transverse Movement)

Drive Units: Motorized trolley wheels for side-to-side movement.

Guide Rollers: Keep the trolley aligned on the girders.

 

5.Trolley travelling mechanism

1.The trolley traveling mechanism of an industrial gantry crane is responsible for moving the hoist or lifting mechanism horizontally along the crane's main beam or gantry. This allows the crane to position the load precisely in the transverse direction.

2.The trolley traveling mechanism consists of several key components:

Components of the Trolley Traveling Mechanism

Drive Unit: Typically an electric motor, the drive unit provides the power to move the trolley. The size and capacity of the motor depend on the crane's lifting capacity and the required speed of the trolley.

Gearbox: The gearbox reduces the high speed of the motor output to a lower speed suitable for the trolley's travel. It also increases the torque, which is necessary to move the hoist mechanism and any attached load.

Wheels or Rollers: The trolley rides on wheels or rollers that are mounted on axles. These wheels or rollers travel along the flanges or tracks on the main beam, allowing the trolley to move back and forth.

Brake System: A braking system is integrated into the trolley to control its movement and to hold it in position when needed. This can be a mechanical brake, an electromechanical brake, or a dynamic braking system.

3.The trolley traveling mechanism is crucial for precise positioning of the load in the transverse direction. It allows the crane to place loads accurately at different points along the length of the gantry. Proper maintenance and regular inspections are essential to ensure that the trolley mechanism operates smoothly and safely. Any issues with this mechanism can significantly impact the crane's operational efficiency and safety, making it vital to address any problems promptly.

 

6.Crane wheel

1.The crane wheel of an industrial gantry crane is a critical component that allows the crane to move along its runway beams or rails. These wheels are designed to support the weight of the crane, its load, and any additional dynamic forces generated during operation.

2.Here are the key features and functions of crane wheels:

Features of Crane Wheels

Material: Crane wheels are typically made from high-strength materials such as steel or cast iron to ensure they can withstand the heavy loads and stresses involved in lifting operations.

Size and Configuration: The size of the wheels varies depending on the capacity and design of the crane. They can be larger for heavier cranes to distribute the load more evenly. The number of wheels per axle and the number of axles per crane can also vary based on design requirements.

3.Crane wheels play a vital role in the mobility and stability of industrial gantry cranes. They are responsible for transferring the weight of the crane and its load to the runway beams or rails while allowing for smooth travel. The durability and efficiency of the crane's movement largely depend on the quality and condition of these wheels.

4.Proper maintenance of crane wheels, including regular inspections and timely replacement of worn components, is crucial for the safe and reliable operation of the crane. Neglecting wheel maintenance can lead to increased downtime, reduced efficiency, and potential safety hazards.

 

7.Crane Hook

1.The crane hook of an industrial gantry crane is a critical component that allows the crane to lift and move various loads. The hook is the point of contact between the crane's hoisting mechanism and the load, making it a crucial interface for safe and efficient operations.

2.Here are the key features and functions of crane hooks:

Features of Crane Hooks

Material: Crane hooks are typically made from high-strength steel or alloy steel to ensure they can withstand the heavy loads involved in lifting operations. The material is chosen for its durability and resistance to wear and tear

Design: The design of the hook includes an opening at the top where it attaches to the hoist rope, chain, or other lifting device. The bottom part of the hook has a curved shape that allows it to securely engage with lifting points on the load.

Safety Latch: Many hooks are equipped with a safety latch or locking mechanism to prevent the load from accidentally slipping off. This latch must be manually opened to release the load at the desired location.

Load Ratings: Each hook is rated for specific maximum loads, and it is essential to use hooks that are rated for the intended loads to ensure safety and compliance with regulations.

 

Motor

The motor of an industrial gantry crane is a critical component that provides the power necessary for lifting and moving loads. Motors in gantry cranes are typically electric and can be categorized into two main types based on their function: the hoisting motor and the travelling (or traversing) motor.

The hoisting motor is responsible for lifting and lowering the hook or grab that engages with the load. This motor's primary function is to control the vertical movement of the crane's loading mechanism.

Crane motors are the powerhouse of industrial gantry cranes, providing the energy required for both lifting and moving operations. The performance, reliability, and safety of the crane are heavily dependent on the motors' efficiency and durability. Proper selection, maintenance, and regular inspections of these motors are crucial for ensuring the crane operates smoothly and safely. Any issues with the motors can lead to operational inefficiencies, increased downtime, and potential safety risks, making prompt attention to motor problems essential.

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Sound and light alarm system & limit switch

1.Industrial gantry cranes are equipped with a sound and light alarm system and limit switches to enhance safety and operational efficiency. These components play crucial roles in preventing accidents and ensuring that the crane operates within its designated parameters.

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. This system is particularly important in environments where the crane operates in close proximity to workers or where visibility is limited.

3.Limit Switches

Limit switches are electronic devices that serve as critical safety features on industrial gantry cranes. They detect the position of the crane or its components and cut off power when the crane reaches its operational limits, preventing potential accidents and damage.

4.Both the sound and light alarm system and limit switches are integral to the safe operation of industrial gantry cranes. The alarm system ensures that personnel are aware of the crane's movements and operational status, reducing the risk of collisions or other hazards. Limit switches, on the other hand, automate safety by physically preventing the crane from operating beyond its design limits. Together, these systems contribute to a safer workplace and protect both the crane equipment and the personnel working around it. Proper maintenance and regular testing of these systems are essential to ensure they function reliably and effectively.

10.Safety Devices

Overload Protection Devices

Overload protection devices are designed to prevent the crane from operating beyond its safe working load limits. These devices monitor the load being lifted and will either send an alert or shut down the crane if the load exceeds the specified limit. This is crucial for preventing structural damage to the crane and avoiding accidents that can occur due to overloading.

Limit Switches

As mentioned earlier, limit switches automatically stop the crane when it approaches the end of its travel range or when any of its components reach their operational limits. These switches are essential for preventing the crane from exceeding its physical boundaries, which could result in damage to the structure or collision with obstacles.

Anti-Collison Devices

Anti-collison devices are particularly important in environments where multiple cranes operate in close proximity or where there is significant ground traffic. These devices use sensors, cameras, or other technologies to detect the presence of other objects in the crane's path and either alert the operator or automatically halt the crane's movement to prevent a collision.

Emergency Stop Buttons

Emergency stop buttons are manually operated controls that allow the crane operator or any authorized personnel to immediately stop all crane operations in case of an emergency. These buttons are strategically placed within easy reach of the operator and are often red and highly visible.

Brake Systems

Brake systems on industrial gantry cranes are designed to hold the load securely in place when not in motion and to provide controlled stopping during operations. These brakes can be mechanical, electrical, or a combination of both, and they are critical for preventing unexpected load movements that could lead to accidents.

Levelness Indicators

Levelness indicators are used to ensure that the crane is level during operation, especially when lifting precise or delicate loads. Uneven lifting can cause loads to shift, potentially leading to loss of control and accidents. These indicators help operators maintain the crane's balance and stability.

Safe Working Load Indicators

Safe working load indicators clearly mark the maximum safe load capacity for the crane. This information is vital for operators to ensure that the crane is not overloaded and operates within its design specifications.

 

11.Control Mode

1.Manual Control

Direct Intervention: The crane operator directly controls the hoisting and traveling movements of the crane using handwheels, levers, or push buttons. This mode requires skilled operators who can manually synchronize the movements to achieve the desired positioning of the load.

Simple Mechanisms: Manual control systems are generally simpler in design and may be less prone to complex failures.

Limited Precision: The precision of the crane's movements is limited to the operator's skill and experience.

2.Semi-Automatic Control

Assisted Operation: The crane operator uses control devices such as joysticks or paddle switches to command the crane, but the system includes automated features that assist in controlling speed and synchronization.

Enhanced Safety: Semi-automatic systems often include safety features like automatic stops at load limits or travel limits.

Improved Efficiency: These systems can improve operational efficiency by reducing the need for highly skilled operators.

3.Fully Automatic Control

Programmable Logic Controller (PLC): The crane's operations are governed by a PLC, which can be programmed to perform specific sequences of operations automatically.

Precise Control: Fully automatic systems offer precise control over the crane's movements, allowing for complex maneuvers to be executed consistently.

Reduced Human Error: Automated systems reduce the potential for human error, enhancing safety and reliability.

Remote Operation: In some cases, fully automatic cranes can be operated remotely, removing the operator from potentially hazardous environments.

4.Radio Control

Wireless Operation: The crane operator uses radio transmitters to control the crane from a distance, which can be particularly useful in environments where visual contact with the crane is limited.

Increased Flexibility: Radio control allows operators to move freely around the work area while maintaining control of the crane.

Safety Considerations: Proper frequency management and security measures must be in place to prevent interference or unauthorized operation of the crane.

5.Computer Control

Advanced Systems: Some gantry cranes may employ computer systems that integrate advanced features such as machine vision, artificial intelligence, and data analysis to optimize operations.

Data Collection: Computer-controlled cranes can collect operational data, which can be used for maintenance planning and operational optimization.

Interface Options: Operators may interact with the crane through touch screens or other advanced interfaces, providing detailed feedback and control options.

 

12.Sketch

 

 

 

 

1. High Load Capacity & Stability

✔ 30-ton lifting capacity – Can handle massive marble blocks and slabs with ease.
✔ Double girder design – Provides superior strength and rigidity compared to single-girder cranes.
✔ Minimal deflection – Ensures smooth and safe lifting even at full load.

2. Precise & Controlled Handling

✔ Variable Frequency Drive (VFD) control – Enables smooth acceleration/deceleration for delicate marble positioning.
✔ Anti-sway technology (optional) – Reduces load swing, preventing damage to fragile marble surfaces.
✔ Dual-speed hoisting – Allows both fast lifting and slow, precise placement.

3. Durability & Long Service Life

✔ High-grade steel construction (Q345B/Q235B) – Resists deformation under heavy loads.
✔ Corrosion-resistant coatings – Protects against moisture and harsh environments (important for outdoor quarries).
✔ Low-maintenance components – Sealed bearings, hardened wheels, and durable wire ropes reduce downtime.

4. Safety Features for Heavy Loads

✔ Overload protection system – Prevents lifting beyond rated capacity.
✔ Emergency stop & fail-safe brakes – Ensures immediate stopping in critical situations.
✔ Limit switches – Prevents over-hoisting and over-travel accidents.
✔ Anti-collision system (optional) – Essential when multiple cranes operate in the same area.

5. Customizable for Marble Handling

✔ Specialized lifting attachments – C-hooks, slab lifters, or vacuum lifters for secure marble handling.
✔ Adjustable span & height – Can be tailored to fit different workshop or quarry layouts.
✔ Indoor/outdoor use – Can be designed with weatherproofing for outdoor marble yards.

6. Cost-Effective & Efficient Operation

✔ Reduces manual labor – Minimizes worker fatigue and injury risks.
✔ Faster material handling – Increases productivity in marble processing and loading/unloading.
✔ Energy-efficient motors – Lowers operational costs compared to traditional lifting methods.

 

 

Applications of Customized Design 20 Ton 30 Ton Double Girder Gantr Crane

Customized Design 20 Ton 30 Ton Double Girder Gantr Crane is an indispensable material handling solution for various marble-related operations. Here are its key applications:

1. Marble Quarry Operations

Block Extraction: Lifting massive raw marble blocks (20-30 tons) from quarry pits

Loading/Unloading: Transferring blocks from mining sites to trucks/trailers

Block Rotation: Precise positioning for cutting and inspection

2. Marble Processing Plants

Slab Handling: Moving cut slabs (3m×2m or larger) between cutting and polishing stations

CNC Machine Feeding: Positioning blocks/slabs on processing equipment

Sorting & Grading: Organizing finished slabs by quality and size

3. Stone Warehouses & Distribution Centers

Storage Operations: Stacking slabs in vertical storage racks

Loading for Shipment: Placing packaged slabs into containers/trucks

Slab Flipping: Safe rotation for inspection and packaging

4. Fabrication Workshops

Monument Production: Handling large memorial stones and sculptures

Countertop Manufacturing: Moving thick slab materials (3cm-10cm)

Custom Stonework: Precise positioning for engraving and detailing

5. Construction & Installation Sites

Cladding Projects: Lifting and positioning large marble facade panels

Monument Installation: Placing heavy memorial stones at cemeteries

Interior Stonework: Installing marble staircases, columns, and features

6. Port & Logistics Operations

Ship Loading/Unloading: Transferring marble blocks between vessels and docks

Railway Handling: Moving slabs between trains and storage areas

Export Packaging: Lifting crated marble for secure shipping

Specialized Marble Handling Features

Non-Marking Lifters: Vacuum or rubber-coated attachments prevent surface damage

Slab Rotation Systems: 90°/180° turning devices for inspection

Dust-Resistant Components: Protected electrical systems for stone processing environments

 

 

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.

 

 

 

Material Inspection

Quality Inspection: Strict quality inspection is carried out on the purchased raw materials to ensure that they meet the design requirements and national standards.

Material Storage: Qualified materials are stored according to classification to prevent corrosion or damage.

Cutting and Forming

Steel Cutting: Use plasma cutting, laser cutting or flame cutting and other technologies to cut the steel according to the size of the design drawing.

Forming Processing: Form the steel plate through bending, rolling, welding and other processes to manufacture the main beam, end beam and other structural parts.

Welding

Component Welding: The cut and formed steel parts are welded into the main structures such as the main beam, end beam and trolley. The welding process needs to be strictly controlled to ensure the structural strength and welding quality.

Weld Inspection: Use non-destructive testing technology (such as ultrasonic testing, radiographic testing) to inspect the welds to ensure that there are no cracks or other defects.

Machining

Precision Machining: Precision machining is performed on the key components of the crane, such as wheel sets, bearing seats, pulleys, etc., to ensure their dimensional accuracy and surface quality.

Assembly of the whole machine

General assembly: On the basis of pre-assembly, the overall assembly of the crane is carried out, including the final installation of the main beam, end beam, lifting mechanism, walking mechanism, etc.

Commissioning and testing

Under dynamic conditions, the operating performance of the crane is tested, including the testing of lifting, walking, steering and other functions. The overall size of the assembled bridge crane is checked to ensure that all dimensions meet the design requirements.

Spraying and anti-corrosion treatment

Surface treatment Rust removal: Rust removal on the surface of the crane, common methods include sandblasting, pickling, etc. Primer spraying: Spray anti-corrosion primer on the treated surface to prevent metal oxidation and corrosion. Topcoat spraying Color spraying: Spray topcoat according to customer requirements or industry standards to give the crane a protective and decorative effect. Marking: After spraying, mark the crane's identification information in accordance with the specifications, such as model, rated load, etc.

Factory and installation

Packaging and transportation

Packaging protection: Protectively package the key components of the crane to prevent damage during transportation. Transportation arrangement: According to the equipment size and transportation conditions, select a suitable transportation method to transport the crane to the customer's site.

Acceptance and delivery

Customer acceptance

On-site acceptance: The customer conducts on-site acceptance of the crane according to the contract requirements and technical specifications to check the performance and quality of the equipment.

Problem rectification: If any problems are found, the manufacturer needs to rectify them in time to ensure that the equipment fully meets the customer's requirements. Delivery and use Operation training: The manufacturer usually trains the customer's operators to ensure that they can operate the crane correctly and safely.

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