In the heart of China’s industrial landscape, the double girder overhead crane stands as a testament to innovation and engineering excellence. These cranes, equipped with powerful electric hoists, are the backbone of various industries, from steel production and shipbuilding to chemical plants and power stations. Their ability to handle heavy loads and span extensive distances makes them indispensable in modern manufacturing.

This in-depth guide delves into the world of double girder overhead cranes in China, exploring their structural nuances, operational capabilities, and the advancements that have made them competitive with international standards. Readers will gain insights into the different types of double girder cranes, such as the LH and QD models, and how they are customized to meet specific industrial needs. You will learn about the key features, including lifting capacities ranging from 5 to 550 tons, advanced control systems, and the benefits of their robust yet efficient designs.

Whether you are an industry professional seeking to upgrade your facility’s lifting solutions or an enthusiast interested in

Double Girder Overhead Crane with Electric Hoist

Guide to Double Girder Overhead Cranes

Introduction

Double girder overhead cranes are robust and versatile lifting solutions designed for handling heavy loads in various industrial environments. Here is a comprehensive guide to help you understand the key features, benefits, and considerations when selecting a double girder overhead crane.

Structure and Operation

Girders and Runways

• A double girder overhead crane consists of two parallel girders that form the bridge, which moves along the runways built into the building’s support structure. These girders are typically box-shaped for high strength, rigidity, and stability[3][5].

End Trucks and Movement

• The girders are supported by end trucks at each end, which enable the crane to move forward and backward along the length of the runways as a single unit[5].

Trolley and Hoist

• The trolley and hoist usually run on top of the girders, allowing for higher hook heights compared to single girder cranes. This setup is particularly beneficial for lifting taller and longer objects[1][5].

Benefits

Load Capacity

• Double girder overhead cranes are designed to handle heavy loads, often ranging from 20 tons to over 500 tons. They are ideal for applications requiring frequent lifting of heavy loads[3][5].

Improved Hook Height

• The top-running trolley and hoist configuration provides a higher hook height, which is essential for lifting objects in areas with limited headroom[1][5].

Span and Coverage

• These cranes can span longer distances compared to single girder cranes, making them suitable for larger workspaces and industrial areas[1][3].

Multiple Lifting Points

• It is possible to add additional hoists to individual girders, providing multiple lifting points and enhancing the crane’s versatility[1].

Applications

Industrial Environments

• Double girder overhead cranes are widely used in various industries such as manufacturing, metal smelting, steel plants, power plants, and warehouses. They are essential for tasks like handling ladles, steel pipes, coils, and other heavy materials[2][3].

Specific Use Cases

• In manufacturing, they are used for lifting heavy equipment and components.
• In metal smelting, they handle ladles, slabs, and other heavy loads in high-temperature environments[3].

Features and Customizations

Performance and Efficiency

• Double girder overhead cranes are designed for high-speed operation and efficient production, making them ideal for demanding environments. They offer reliable performance, simple operation, and lower maintenance costs[2][3].

Additional Features

• Features such as maintenance platforms, crab units with walkways, and auxiliary hoists can be easily implemented to meet specific application needs[4].

Automation

• These cranes can be fully automated, making them suitable for unmanned factories and warehouses[2].

Selection and Installation Considerations

Weight Capacity

• The primary consideration is the maximum weight the crane needs to lift. Ensure the crane’s capacity exceeds the maximum load to provide a safety margin[3][5].

Span and Lifting Height

• Measure the distance between the crane’s runway beams (span) and the height from the ground to the highest point the crane needs to lift (lifting height). These measurements will determine the crane’s coverage area and operational capabilities[3][5].

Hook Approach

• Consider the hook approach, which is the distance from the centerline of the runway to the extreme hook position. Double girder cranes have a smaller hook approach compared to single girder cranes, affecting floorspace utilization[5].

Installation and Structural Impact

• Double girder overhead cranes require more material and place greater strain on the building structure and foundation. Ensure that the building can support the added deadweight and consider additional support columns or tie-backs if necessary[5].

Manufacturer and Support

• Choose a manufacturer that offers comprehensive services, including design, engineering, and post-sales support. This ensures that you receive a crane that is tailored to your specific needs and that any issues can be promptly addressed[5].

By carefully considering these factors, you can select a double girder overhead crane that meets your lifting requirements, enhances operational efficiency, and provides reliable performance in your industrial environment.

Overhead Crane 20t load

Given that the specific website you mentioned is not accessible in the search results, I will create a comprehensive guide based on the general information available from other reliable sources on the topic of double girder overhead cranes, including their features, benefits, and considerations.

Double Girder Overhead Cranes: A Comprehensive Guide

What is a Double Girder Overhead Crane?

A double girder overhead crane is a type of bridge crane that features two parallel girders that form the bridge. These girders are supported by end trucks that move along the runways built into the building’s support structure. The trolley and hoist typically run on top of these girders, enabling the crane to lift and move heavy loads efficiently.

Key Components and Features

Girders

• Double girder cranes use two large beams (girders) that provide horizontal support and can bear both dynamic and static loads[1][3][5].

Trolley and Hoist

• The trolley and hoist are usually placed on top of the girders, which increases the hook height compared to single girder cranes. This design allows for lifting taller and longer objects[3][5][4].

End Trucks

• End trucks are located at the ends of each girder and are responsible for moving the girders and the hoist along the runways[3][4].

Runways

• The runways are built into the building’s support structure and provide the path for the end trucks to move the crane[3][4].

Benefits of Double Girder Overhead Cranes

Greater Hook Height

• Double girder cranes offer an extra 18-36 inches of hook height because the trolley and hoist are placed on top of or between the girders, allowing for the lifting of taller loads[3][5][4].

Higher Load Capacity

• These cranes are designed for frequent lifting of heavy loads, often exceeding 20 tons, making them ideal for heavy-duty applications[1][4][5].

Longer Span

• Double girder cranes can span longer distances due to the combined strength of the two girders, which is greater than that of a single girder[3][4].

Additional Features

• They can incorporate additional features such as service walkways, maintenance platforms, lights, cabs, and multiple hoists on each girder, enhancing their functionality and safety[1][3][5].

Applications and Use Cases

Heavy-Duty Industries

• Double girder cranes are commonly used in industries such as mining, iron and steel production, railyards, shipping ports, and other heavy manufacturing environments[1][5].

Custom and Specialized Needs

• They can be customized for unique applications, including aerospace, military sites, and nuclear fuel facilities, where heavy-duty lifting is required[1].

Considerations for Selection

Weight Capacity

• The primary consideration is the weight of the loads to be lifted. Double girder cranes are suitable for loads exceeding 20 tons[4].

Span and Hook Approach

• The span of the crane (the distance between the runways) and the hook approach (the distance the hook can reach) are crucial factors. Double girder cranes can span longer distances but may have a smaller hook approach compared to single girder cranes[4].

Installation and Support Structure

• The installation process and the building’s support structure must be carefully evaluated. Double girder cranes may require additional tie-backs or support columns due to their greater weight and load capacity[5].

Top Running vs. Under Running

• Double girder cranes can be either top-running or under-running. Top-running cranes provide more overhead room and greater hook height but may have a smaller hook approach[4][5].

Advantages and Disadvantages

Advantages

• Greater hook height
• Higher load capacity
• Longer span capabilities
• Ability to incorporate additional features like service walkways and multiple hoists
• Suitable for frequent and heavy-duty lifting operations[3][4][5].

Disadvantages

• More expensive due to added material costs and complex components
• Higher costs related to freight and installation
• Greater strain on the building’s support structure
• Smaller hook approach, especially for top-running cranes[5].

Conclusion

Double girder overhead cranes are robust and versatile lifting solutions ideal for heavy-duty applications. They offer superior load capacity, greater hook height, and the ability to span longer distances. While they are more expensive and complex compared to single girder cranes, their benefits make them a valuable investment for industries requiring frequent and heavy lifting operations. Careful consideration of the crane’s design, weight capacity, span, and installation requirements is essential to ensure the crane meets the specific needs of the application.

20 Ton Double Girder Overhead Crane

Guide to 20 Ton Double Girder Overhead Cranes

Introduction

Double girder overhead cranes are robust and versatile lifting solutions commonly used in various industrial settings. Here is a comprehensive guide to the 20 ton double girder overhead crane, covering its key features, advantages, and applications.

Key Parameters

Load Capacity

• The load capacity of a 20 ton double girder overhead crane can range from 5 tons to 500 tons, although the specific model in question is rated for 20 tons[1].

Crane Span

• The crane span can vary from 4.5 meters to 31.5 meters, and can be customized to meet specific requirements[1].

Lifting Height

• The lifting height ranges from 3 meters to 30 meters and can also be customized[1].

Hoist Unit

• These cranes can be equipped with either wire rope hoists or chain hoists[1].

Working Duty

• The working duty classification for these cranes is A4~A8, indicating their suitability for various levels of operational intensity[1].

Power Source

• The power source can be tailored to match the user’s existing power supply infrastructure[1].

Design Advantages

Beehive Beam Design

• The first beehive beam design of double girder overhead cranes offers light weight, large loading capacity, and strong wind-resistant performance[1].

Steel Pin Connection

• The unique steel pin connection ensures a firm and reliable structure while reducing assembly time[1].

Flexible Supporting Leg

• The flexible supporting leg allows for easy transportation by dividing the site into single pieces[1].

Minimum Installed Capacity

• The design minimizes installed capacity, addressing the challenge of power consumption in field construction[1].

Differences Between Single and Double Girder Overhead Cranes

Structure

• Single girder overhead cranes have a simpler structure, are lighter, and easier to install and maintain. Double girder overhead cranes have a more complex structure, are heavier, and require more complicated installation and maintenance[1].

Production Costs

• Single girder cranes are less expensive due to shorter spans and lower material consumption. Double girder cranes are more costly because of their larger spans, higher material consumption, and advanced technical content[1].

Operation Modes

• Single girder cranes can be operated from the ground via remote control or manually. Double girder cranes typically require workers to control them directly[1].

Mechanical Properties

• Single girder cranes have lower stability and working levels compared to double girder cranes, which offer higher stability, heavier rated lifting weights, and higher working levels[1].

Operating Environment

• Single girder cranes are suitable for short spans, lighter lifting weights, and smaller construction sites. Double girder cranes are ideal for long spans, heavier lifting, and larger operational areas[1].

Applications

Double girder overhead cranes are widely used in various industrial settings due to their robustness and versatility:
– Manufacturing and Assembly Lines: For heavy material handling and precise positioning.
– Construction Sites: For lifting and moving heavy construction materials.
– Loading and Unloading Shipping Containers: Efficiently handling heavy cargo.
– Transporting Heavy Machinery and Equipment: In machine shops, warehouses, and fabricating plants.
– Maintenance and Repair Operations: For lifting and positioning heavy components during maintenance[2][4].

Components and Features

Bridge Girder

• The double girder bridge provides increased stability and load-bearing capacity[2].

End Trucks

• Supported by end trucks for smooth movement along the runway rails[2].

Hoist Unit

• Equipped with wire rope or chain hoists for vertical lifting and horizontal positioning[1].

Control System

• Advanced control systems ensure precise and safe operation, with various lifting speeds and control options available[2].

Safety Features

• Include end stops and bumpers to enhance safety during crane operation[2].

Power Supply

• Festoon systems or cable reels provide continuous power supply to the crane[2].

Installation and Maintenance

• Installation: While more complex than single girder cranes, double girder cranes can be customized and designed for efficient installation.
• Maintenance: Regular maintenance is crucial due to the complex structure. However, the design features such as the steel pin connection and flexible supporting leg can simplify some aspects of maintenance[1].

Conclusion

The 20 ton double girder overhead crane is a powerful and reliable lifting solution for heavy-duty industrial applications. Its advanced design, robust construction, and customizable features make it an ideal choice for various operational needs. Understanding the key parameters, design advantages, and differences between single and double girder cranes can help in selecting the right equipment for specific business requirements.

120+40t Double Girder Overhead Crane

Since the provided URL does not lead to a specific page that can be accessed, I will create a comprehensive guide based on the general information about double girder overhead cranes from the other sources.

Guide to Double Girder Overhead Cranes

Introduction

Double girder overhead cranes are a type of bridge crane that consists of two girders (the bridge) running between two overhead runways built into the building’s support structure. These cranes are designed for heavy-duty lifting and offer several advantages over single girder cranes.

Key Components and Structure

Main Girders

• Double girder cranes feature two main girders, typically box-shaped or structural girders, which provide high strength, rigidity, and stability for heavy-duty lifting[1][4][5].

End Trucks

• Located at the ends of each girder, end trucks move the girders and the hoist forward and backward along the length of the runways[5].

Hoist and Trolley

• The trolley and hoist usually run along the top of the girders. Various types of hoists, such as wire rope hoists or electric hoists, can be used depending on the application[1][3][5].

Advantages

Greater Hook Height

• Double girder cranes offer higher hook heights compared to single girder cranes, providing more overhead room and greater versatility in lifting operations[5].

Unlimited Span and Capacity

• There are no limits to the maximum span or lifting capacity of double girder cranes, making them ideal for large workspaces and heavy loads[5].

Customization and Accessories

• These cranes can be fitted with various accessories such as service walkways, maintenance platforms, lights, cabs, and other specialized equipment[5].

Specifications and Considerations

Weight Capacity

• Double girder overhead cranes are designed for frequent lifting of heavy loads, typically starting from 20 tons and going up to 500 tons or more[1][5].

Span

• The span of the crane, which is the distance between the crane’s runway beams, can vary widely but is often necessary for spans over 60 feet[5].

Lifting Height

• The lifting height is the distance from the ground to the highest point the crane needs to lift, including the distance between the crane’s hook and the load’s lifting point[1].

Speeds

• Double girder cranes can operate at high speeds for both long and cross travel, as well as trolley and crane running speeds[1][2].

Work Duty Classification

• Cranes are classified according to their work duty, ranging from Class A (infrequent or standby) to Class F (continuous severe service). Choosing the correct classification is crucial for the crane’s longevity and performance[5].

Types of Double Girder Overhead Cranes

General Type (AQ-QD)

• Features a robust box-shaped double main beam design, ideal for high-speed operation and efficient production in demanding environments. This type is generally more cost-effective than European standard cranes[1].

European Standard (AQ-QDX)

• Adopting a lightweight European standard design, these cranes offer a compact structure with low wheel pressure and reduced boundary size. They are equipped with frequency conversion motors for enhanced safety and reliability[1].

With Hoist (AQ-LH)

• Designed for lighter loads and less demanding material handling tasks, these cranes are suitable for A3 and A4 work duty classifications[1].

Applications and Industries

Heavy Industry

• Double girder cranes are commonly used in heavy industries such as steel, manufacturing, and power plants where high hook lift and heavy service are required[4].

Large Workspaces

• These cranes are ideal for large workspaces where wide spans and high lifting capacities are necessary[2][4].

Specialized Tasks

• They can be used for precise placement of large equipment, handling large coils, and loading heavy machinery onto rail cars[4].

Maintenance and Safety

Motor and Gearbox

• Cranes often feature double or triple reduction parallel shaft, helical/spur reducers for dependable service and longer life. Thermal detectors and other safety features are integrated to prevent overload and ensure compliance with safety standards[3].

Structural Integrity

• Built with structural steel girders that meet or exceed CMAA design specifications, OSHA, and ANSI standards, ensuring a minimum deflection and a built-in safety factor[3].

Conclusion

Double girder overhead cranes are versatile and powerful tools designed for heavy-duty lifting operations. By considering factors such as weight capacity, span, lifting height, work duty classification, and the specific needs of your industry, you can select the right double girder overhead crane to optimize your production and ensure safe and efficient operations.

China EOT Cranes Manufacturer Tavol Brand Double …

Guide to Tavol Brand Double Beam Bridge Cranes

Overview

Tavol Brand Double Beam Bridge Cranes, also known as double girder overhead cranes or double girder bridge cranes, are designed for various industrial applications requiring heavy-duty lifting and moving of loads. Here is a comprehensive guide to these cranes.

Structure and Components

Main Components

• Double Girder Beam: The crane consists of two girder beams that make up the bridge, supported by an end truck on each side.
• Lifting Trolley: The electric hoist trolley runs on a rail installed above the bridge girders.
• Crane Traveling Mechanism: This includes the end trucks and the rails along which the crane travels.
• Electrical System: Includes the control system, motors, and electrical parts.

Specifications

Capacity

• Load capacities range from 3 tons to 200 tons, with common models including 5 tons, 10 tons, 15 tons, 20 tons, 32 tons, and heavier capacities like 50 tons and 200 tons[1][3][5].

Span

• The span of the crane can vary from 6 meters to 42 meters, with some models offering customized spans[1][3][5].

Lifting Height

• Lifting heights can range from 3 meters to 60 meters, depending on the model and application[1][3][5].

Work Duty

• The work duty of these cranes can be classified as A4/M4, A5/M5, A6/M6, and A7/M7, indicating their suitability for light to heavy-duty applications[1][3][5].

Control Methods

• Control methods include remote control and pendant control, with some heavy-duty models offering cabin control[1][3][5].

Electrical and Mechanical Parts

• Electrical parts are from reputable brands such as CHINT or Schneider.
• Motors are from Chinese famous brands or international brands like Boneng.
• Bearings are from the Chinese famous brand “HRB”[1][3][5].

Product Features

Cost Efficiency

• These cranes help in reducing the cost of building and maintaining plant and workshop facilities by optimizing space and improving production efficiency[1].

Production Efficiency

• They enhance production efficiency by enabling quick and precise movement of heavy loads[1].

Versatility

• Suitable for various operating conditions and provide one-stop solutions for different industrial needs[1].

Maintenance

• Designed to reduce daily maintenance requirements, ensuring smooth and continuous operation[1].

Safety and Performance

• Equipped with safety features such as forged hooks with safety locks and high-performance electrical and mechanical components[1].

Applications

Industrial Use

• Widely applicable in multiple fields including:
• Pre Engineered Steel Building
• Steel Plant
• Steel Product Maker
• Oil Industry
• Plastic Plant
• Cement Plant
• Power Plant
• Mine Industry
• Food Industry
• Chemical Industry
• Cable Plant
• Machine Tools
• Car/Truck Industry
• Transport Company
• Construction Company
• Electrical Company
• Shipyard
• Stone Yard
• Installation and Maintenance[1][3][5].

Operating Parameters

Lifting Speed

• Lifting speeds range from 0-8 meters per minute to 0-10 meters per minute, depending on the model[1][3][5].

Cross Travel Speed

• Cross travel speeds can be up to 20 meters per minute or 30 meters per minute for heavier duty models[1][3][5].

Long Travel Speed

• Long travel speeds can be up to 20 meters per minute or 80 meters per minute for heavy-duty applications[1][3][5].

Variable Frequency Drives

• Optional variable frequency drives for precise speed control[1][3].

Packaging and Shipping

Packaging

• Electric parts are packed in high-quality plywood crates to prevent distortion.
• Main beams and end beams are packed in plastic woven cloth to reduce abrasion.
• The whole set of the overhead crane is shipped by container or bulk[1][3][5].

After-Sales Service and Warranty

Warranty

• Typically comes with a 1-year to 2-year warranty, depending on the model and supplier[2][5].

After-Sales Service

• Suppliers offer after-sales service, including overseas installation support, free spare parts within the warranty period, and 24/7 online service[5].

Conclusion

Tavol Brand Double Beam Bridge Cranes are robust, versatile, and highly efficient lifting solutions suitable for a wide range of industrial applications. Their design ensures high working efficiency, smooth movement, and convenient maintenance, making them a valuable asset in various industries.

Overhead Crane – Gantry Crane | China Heavy Crane …

Guide to Overhead and Gantry Cranes: Selection, Components, and Applications

Introduction

Overhead and gantry cranes are essential pieces of equipment in various industrial settings, including manufacturing, construction, and cargo handling. These cranes are designed to handle and transport heavy loads efficiently and safely. Here is a comprehensive guide to help you understand the components, types, and applications of overhead and gantry cranes.

Overhead Cranes

Components of Overhead Cranes

Overhead cranes are composed of several key components:

Bridge

• The bridge is the main structure of the overhead crane, consisting of the main beam, end beams, and a walking platform.
• The main beam is typically a box-shaped structure, and the end beams are connected at both ends of the main beam.
• A walking platform with safety railings is installed outside the main beams[4].

Lifting Mechanism

• The lifting mechanism includes a motor, reducer, drum, and brake.
• The motor is connected to the reducer, which in turn is connected to the drum wound with a steel wire rope.
• For cranes with a lifting capacity of 15 tons and above, there are often two sets of lifting mechanisms: the main hook and the auxiliary hook[4].

Crane Travelling Mechanism

• This mechanism allows the crane to move longitudinally along the runway beams.
• It consists of a motor, transmission shaft, reducer, wheel, and brake.
• There are centralized and separate driving modes[4].

Trolley Travelling Mechanism

• The trolley moves laterally along the main beam, driven by a motor and reduction gearbox.
• The trolley frame includes the trolley running mechanism and the lifting mechanism[4].

Control Room

• The control room houses the control devices for the crane and trolley mechanisms, lifting mechanisms, and safety protection devices.
• The cab can be fixed at one end of the main beam or mounted below the trolley[4].

Types and Configurations

Overhead cranes come in various configurations to suit different facility conditions and lifting requirements:

Single Girder

• Single girder overhead cranes have one main girder and are suitable for lighter loads and simpler applications.

Double Girder

• Double girder overhead cranes have two main girders and offer stronger bearing capacity and larger spans.

Top Running

• Top running overhead cranes have the crane bridge running on top of the runway beams.

Underhung

• Underhung overhead cranes have the crane bridge suspended from the runway beams[2].

Selection Criteria

To select the right overhead crane for your application, consider the following:
– Rated Load: The maximum weight the crane needs to lift.
– Span of the Crane: The distance between the runway beams.
– Lifting Height: The maximum height the crane needs to lift loads.
– Type of Load or Material: The nature of the loads being lifted.
– Crane Working Environment: Indoor or outdoor, and any specific environmental conditions.
– Operating Hours: How many hours the crane will be in operation per day.
– Travel Distance: How many meters the crane will travel[2].

Gantry Cranes

Components of Gantry Cranes

Gantry cranes are variations of bridge cranes with support legs installed under the main beam:

Metal Structure

• The metal structure includes the main beam, end beams, support legs, and lower beams.
• It can be a box-shaped or truss structure[3].

Lifting Mechanism

• The lifting mechanism is typically an electric hoist with a hook, grab bucket, or electromagnetic chuck to handle various materials[3].

Running Mechanism

• The running mechanism includes the trolley running mechanism and the crane running mechanism, both driven by motors and reduction gearboxes[3].

Safety Protection System

• Includes lifting limiter, overload limiter, stroke limiter, bumper, and wind-resistant anti-skid device[3].

Types of Gantry Cranes

Gantry cranes are classified based on their structure and application:

Gantry Frame Structure

• Full Gantry Crane: Both ends of the main beam have support legs.
• Semi Gantry Crane: Only one end of the main beam has a support leg.
• Cantilever Gantry Crane: The main beam extends beyond the support legs on one or both sides[3][5].

Main Beam Structure

• Single Beam Gantry Crane: One girder beam, often used for loads below 20 tons.
• Double Beam Gantry Crane: Two girder beams, offering stronger bearing capacity and larger spans[5].

Main Beam Types

• Box-Type: High safety and rigidity.
• Truss Type: Low cost, light weight, and good wind resistance[5].

Applications

Gantry cranes are used in various applications:

General Gantry Crane

• Versatile and can handle various materials or loads up to several hundred tons.

Shipbuilding Gantry Crane

• Used for assembling hulls, often with two lifting trolleys.

Container Gantry Crane

• Used for stacking and transporting containers at container terminals.

Gantry Crane for Hydropower Station

• Used for lifting, opening, and closing gates, and installation work[5].

Selection Criteria

When selecting a gantry crane, consider the following:
– Rated Load Capacity: The maximum weight the crane needs to lift.
– Span of the Crane: The distance between the support legs.
– Lifting Height: The maximum height the crane needs to lift loads.
– Material or Load to be Lifted: The nature of the loads being lifted.
– Crane Working Environment: Indoor or outdoor, and any specific environmental conditions.
– Operating Hours: How many hours the crane will be in operation per day.
– Travel Distance: How many meters the crane will travel[3][5].

After-Sales Service and Support

Both overhead and gantry cranes require comprehensive after-sales service to ensure optimal performance and safety:
– Installation and Commissioning: Professional installation and commissioning of the crane.
– Staff Training: Training for operators to ensure safe and efficient use of the crane.
– Free Technical Consultation: Ongoing technical support to address any issues or questions.
– Maintenance and Repair: Regular maintenance and repair services to extend the crane’s lifespan[1].

By understanding the components, types, and selection criteria for both overhead and gantry cranes, you can make informed decisions to enhance the efficiency and safety of your industrial operations.

1 Ton to 50 Ton Overhead Cranes in China, Types …

Guide to Overhead Cranes: Types and Specifications

Introduction to Overhead Cranes

Overhead cranes are essential components in various industrial settings, including factories, warehouses, and workshops. They are designed to handle heavy loads efficiently and safely. Here is a comprehensive guide to the types and specifications of overhead cranes.

Types of Overhead Cranes

Single Girder Overhead Cranes

Characteristics

• Capacity: Typically ranges from 1 to 20 tons[2][3][5].
• Span: Usually spans between 7.5 to 31.5 meters[1][2][3].
• Lifting Height: Can vary from 6 to 30 meters[1][2].
• Lifting Speed: Generally ranges from 0.8 to 5 meters per minute[2].
• Trolley Speed: Usually between 2 to 20 meters per minute[2].
• Crane Speed: Can range from 3 to 30 meters per minute[2].

Advantages

• Lighter and less expensive compared to double girder cranes.
• Easier installation and maintenance.
• Suitable for lighter to medium-duty applications.

Double Girder Overhead Cranes

Characteristics

• Capacity: Ranges from 5 to 450 tons, depending on the model[1][2][5].
• Span: Typically spans between 10.5 to 31.5 meters[1][2].
• Lifting Height: Can range from 6 to 24 meters[1][2].
• Lifting Speed: Generally between 2.1 to 11.5 meters per minute[2].
• Trolley Speed: Usually between 27 to 40 meters per minute[2].
• Crane Speed: Can range from 42 to 75 meters per minute[2].

Advantages

• Higher lifting capacities and longer spans.
• Increased headroom due to the placement of the hoist between the two girders.
• Suitable for heavy-duty applications.

Top Running and Under Running Cranes

Top Running Cranes

• Mounting: Mounted on top of the runway beams, which can be part of the building structure or a freestanding system[3][5].
• Benefits: Greater lifting height and easier installation and service[3][5].

Under Running Cranes

• Mounting: Mounted below the runway beams, often used when headroom is limited[3][5].
• Benefits: Suitable for facilities with low ceilings, though it offers less lifting height compared to top running cranes.

Box Girder Cranes

Characteristics

• Capacity: Mono box girder cranes typically handle 3 to 15 tons, while double box girder cranes handle 5 tons and greater capacities[4].
• Span: Can span up to 100 feet or more[4].
• Benefits: Free-standing, space-saving, and offers the highest hook height and capacity. The hollow box structure provides extra strength for longer spans[4].

Gantry Cranes

Characteristics

• Capacity: Can range from small to very large capacities, with the largest gantry cranes capable of lifting massive loads[5].
• Span: Varies widely, with some gantry cranes spanning over 100 feet[5].
• Benefits: Can be used in outdoor or indoor settings, and are particularly useful where overhead cranes cannot be installed[5].

Jib Cranes

Characteristics

• Capacity: Typically up to 5 tons[4][5].
• Mounting: Can be floor-mounted or wall-mounted[5].
• Benefits: Maximizes floor space, offers up to 360-degree rotation, and is ideal for precise load positioning in limited spaces[4][5].

Specifications and Parameters

Capacity and Span

• The capacity of an overhead crane is a critical specification, ranging from a few tons for single girder cranes to hundreds of tons for double girder and gantry cranes.
• The span of the crane, which is the distance between the runway beams, can vary significantly depending on the type and application of the crane.

Lifting Height and Speed

• Lifting height is another important parameter, with cranes capable of lifting loads from a few meters to over 30 meters.
• Lifting speed, trolley speed, and crane speed are also crucial for determining the efficiency and suitability of the crane for specific tasks.

Work Duty and Temperature

• Overhead cranes are classified into different work duty classes (e.g., A3 to A7), which indicate their usage frequency and load intensity[1][2].
• Temperature range is also a specification, with some cranes designed to operate in extreme temperatures (e.g., -20 to +60 degrees Celsius)[2].

Customization

• Many manufacturers offer customized services to tailor the crane specifications to the user’s specific needs, including adjustments in height, span, and lifting capacity[1][2].

Installation and Maintenance

Installation Considerations

• The installation of an overhead crane involves careful planning, including ensuring the building structure can support the crane’s weight and loads[4].
• Top running and under running configurations have different installation requirements, with top running cranes generally easier to install and service[3][5].

Maintenance Requirements

• Regular maintenance is crucial for the longevity and safety of overhead cranes. This includes routine inspections, lubrication, and replacement of worn-out parts[4].

Conclusion

Overhead cranes are versatile and indispensable tools in industrial settings, offering a range of capacities, spans, and functionalities. Understanding the different types and specifications of overhead cranes is essential for selecting the right crane for your specific needs and ensuring efficient and safe operation. Whether you require a single girder crane for lighter duties or a double girder crane for heavy-duty applications, each type has its unique advantages and requirements.

5 Ton Double Girder Overhead Crane Manufacturers and …

Guide to 5-Ton Double Girder Overhead Cranes

Introduction

Double girder overhead cranes are robust and versatile material handling solutions, often used in heavy-duty applications. Here is a comprehensive guide to 5-ton double girder overhead cranes, covering their specifications, types, and key features.

Specifications of 5-Ton Double Girder Overhead Cranes

Lifting Capacity

• The primary specification of a 5-ton double girder overhead crane is its lifting capacity, which is 5 tons[1][3][5].

Span Length

• The span length of these cranes typically ranges from 7.5 meters to 31.5 meters, allowing for wide coverage in various industrial settings[1][3][5].

Lifting Height

• The lifting height can be customized according to the client’s requirements but generally ranges from 6 meters to 16 meters or more, depending on the installation and application[1][3][4].

Lifting Speed

• The lifting speed for a 5-ton double girder crane usually ranges from 0.8 to 5 meters per minute, with some models offering dual speeds for faster and slower operations[1][2][5].

Trolley Speed

• The trolley speed, which is the speed at which the trolley moves along the crane’s girder, typically ranges from 2 to 20 meters per minute[2][5].

Crane Speed

• The crane speed, or the speed at which the entire crane moves along the runway, can range from 3 to 30 meters per minute[2][5].

Work Duty

• These cranes are often classified under work duty A5, indicating they are suitable for medium to heavy-duty applications[1][2][5].

Types of Double Girder Overhead Cranes

QD Series

• The QD series is a popular type of double girder overhead crane, known for its open winch trolley and robust design. It is suitable for capacities ranging from 5 tons to 320 tons and is often used in heavy-duty industrial environments[1][3].

NLH Series

• The NLH series is an advanced European-style double girder overhead crane with a hoist trolley. It features a compact structure and low headroom design, making it ideal for workshops with limited space. The capacity of NLH cranes typically goes up to 80 tons[1][3].

QE Double Trolley Series

• The QE series is designed for handling long and large loads, featuring synchronized control and separate operation of two trolleys. This series is available for capacities ranging from 2.5 tons to 200 tons[3][5].

Key Features and Advantages

High Safety and Reliability

• Double girder overhead cranes are designed with high safety and reliability in mind. They are equipped with advanced safety features such as dual braking systems and robust structural components[1][3].

Customization

• These cranes can be customized to meet specific client requirements, including lifting height, span length, and other technical parameters. This flexibility makes them adaptable to a wide range of industrial applications[1][3][4].

Heavy-Duty Applications

• Double girder cranes are particularly suited for heavy-duty material handling due to their sturdy construction and high lifting capacities. They can handle loads that single girder cranes cannot, making them ideal for heavy industries such as steel mills and construction sites[1][3][4].

Advanced Design and Technology

• European-style double girder cranes, such as the QDX and NLH series, feature advanced designs with frequency conversion and double speed lifting, ensuring stable and efficient operations[1][3].

Installation and Maintenance

Installation Considerations

• The installation of a double girder overhead crane requires careful planning and execution. Factors such as the crane’s span, lifting height, and the structure of the building must be considered to ensure safe and effective operation[1][3].

Maintenance Requirements

• Regular maintenance is crucial to ensure the longevity and performance of double girder overhead cranes. This includes routine inspections, lubrication of moving parts, and replacement of worn-out components[1][3].

Conclusion

Double girder overhead cranes, particularly the 5-ton models, are indispensable in various industrial settings due to their robust design, high lifting capacity, and customizable features. Understanding their specifications, types, and key features is essential for selecting the right crane for your material handling needs. By choosing the appropriate double girder overhead crane, you can enhance the efficiency and safety of your operations.

China Customized Double Girder Overhead Crane With …

Double Girder Overhead Crane: A Comprehensive Guide

Introduction

Double girder overhead cranes are robust and versatile lifting solutions designed for heavy-duty material handling. These cranes are characterized by their two girder beams, which provide the structural integrity needed to handle heavy loads and long spans.

Key Components and Design

Main Girders

• Double girder overhead cranes feature two main girders that form the crane’s bridge. These girders are typically box-typed and welded, optimized by computer design for high performance and light weight[2][5].

End Trucks/End Carriages

• The main girders are supported by end trucks or end carriages on each side, allowing the crane to travel along the runway beams.

Hoist Trolley or Open Winch Trolley

• The hoist trolley or open winch trolley runs on a rail or track installed on top of the overhead girders. This configuration is known as a top running crane setup[1][3].

Specifications

Lifting Capacity

• Double girder overhead cranes have a lifting capacity ranging from 5 tons to 320 tons, with some customized models capable of lifting up to 500 tons[1][3][4].

Span

• The span of these cranes can vary from 7.5 meters to 42 meters, depending on the specific model and application[1][3][5].

Lifting Height

• The lifting height is customizable and can range from 6 meters to 30 meters or more, depending on the requirements of the facility[2][3].

Working Class

• Double girder overhead cranes are classified under different working classes, such as A3 to A8, indicating their duty cycle and operational intensity[1][3].

Types of Double Girder Overhead Cranes

QD General Type

• This type is a standard double girder overhead crane with a lifting capacity of 5-450 tons, spans of 10.5-31.5 meters, and lifting heights of 6-24 meters[3].

QDX European Standard

• These cranes feature a compact structure and advanced design, with capacities up to 320 tons and spans of 10.5-31.5 meters. They are known for their frequency conversion and double speed lifting capabilities[1][3].

NLH European Standard

• This series includes cranes with a hoist trolley, compact structure, and low headroom design. They have capacities up to 80 tons and spans of 10.5-31.5 meters[1][3].

Applications

Manufacturing Industry

• Double girder overhead cranes are crucial in heavy industries for moving large and heavy materials, components, and equipment throughout a facility[3].

Warehouses and Distribution Centers

• These cranes are ideal for large warehouses and distribution centers where they efficiently lift and move heavy goods and materials[3].

Additional Features and Accessories

Below-the-Hook Lifting Devices

• Double girder overhead cranes can be equipped with various below-the-hook lifting devices such as grabs, tongs, magnets, spreader beams, and C hooks to handle different types of loads[1][3].

Special Installation Alternatives

• These cranes can be adapted to planned or existing buildings through various special installation alternatives, ensuring flexibility in different environments[4].

Additional Options for Productivity and Safety

• Features like maintenance platforms, crab units with walkways, and auxiliary hoists can be added to enhance productivity and safety[5].

Installation and Maintenance

Installation Process

• The installation involves several steps including main girder connection, guardrail installation, bridge platform installation, end beam connection, ladder installation, and trolley installation. Many manufacturers offer comprehensive installation services and 3D instructional videos to guide the process[3].

Maintenance

• Regular maintenance is crucial to ensure the crane’s high functionality and longevity. This includes periodic inspections, lubrication, and replacement of worn-out parts.

Conclusion

Double girder overhead cranes are powerful tools for heavy-duty material handling, offering high lifting capacities, long spans, and versatile configurations. Their robust design, advanced features, and adaptability make them indispensable in various industrial settings. By understanding the specifications, types, and applications of these cranes, users can make informed decisions to meet their specific lifting needs.

Dongqi Crane: Overhead Crane Hoist Manufacturer and …

Overview of DQCRANES

Company Profile

DQCRANES, also known as HENAN DONGQI MACHINERY CO., LTD, is a leading crane manufacturer and supplier based in China. The company is a Sino-New Zealand joint venture established on advanced European technology research and development.

History and Experience

With over 20 years of rich technical experience, DQCRANES has built a reputation for providing high-quality crane services and products. The company is committed to innovation and technological advancement in the design and production of cranes and other lifting equipment.

Manufacturing Capabilities

Factory and Facilities

• DQCRANES’ factory is located in Dongqi Industry Park in Changyuan, Henan, known as the “Cradleland of Cranes.”
• The factory spans 240,000 square meters and employs over 3600 employees, including 500 technicians and more than 70 senior engineers.
• The facility is equipped with over 2000 sets of advanced manufacturing and detection devices, ensuring precision, cost-efficiency, and high-quality production[2].

Production Capacity

• DQCRANES has the capacity to produce over 10,000 sets of cranes and hoists annually.
• The comprehensive annual output value of the company reached 15 billion RMB in 2014[2][3].

Workforce

• The company takes pride in its skilled and experienced workforce, including certified fabrication craftsmen, welders, electricians, and other specialists.
• Employees undergo various training programs to enhance their professional skills[2].

Research and Development

R&D Center

• DQCRANES has a state-of-the-art Research & Development Center that provides advanced technology support.
• The R&D Center includes specialized design rooms for gantry cranes, bridge cranes, hoists, electric apparatus, and craft design.
• More than 60 medium and superior project technicians are dedicated to meeting specific material handling requirements[2].

Product Range

Types of Cranes

• DQCRANES manufactures a variety of cranes, including:
• Overhead cranes (European-style Bridge cranes)
• Gantry cranes
• Jib cranes
• Port cranes and Container cranes
• European electric hoists[3][4].

Customized Solutions

• The company offers customized crane services to meet the specific material handling needs of various industries.
• Products are designed and manufactured strictly according to European standards, ensuring performance that meets or exceeds international advanced levels[3][4].

Quality and Certifications

International Standards

• DQCRANES adheres to national and international standards, having passed certifications such as ISO9001 for quality management, ISO14004 for environmental management, and OHSAS18001 for occupational health and safety management[3].

Collaborations

• The company collaborates with renowned European machinery manufacturers like Britain SZW, German NORD, and SIEMENS, ensuring the use of high-quality components[3].

Global Presence

International Distribution

• DQCRANES products are distributed globally, covering regions such as Southeast Asia, East Europe, the Middle East, Africa, and countries including the United States, Australia, Canada, and many others[3].

Customer Base

• The company serves a diverse range of industries, including steel, electric power, petrochemical, machine building, war industry, warehouse logistics, and papermaking[4].

Conclusion

DQCRANES is a formidable player in the crane manufacturing industry, known for its commitment to technological innovation, high-quality products, and customized solutions. With a robust manufacturing infrastructure, a skilled workforce, and adherence to international standards, DQCRANES continues to meet the material handling needs of clients worldwide.

Frequently Asked Questions (FAQs)

What are the key components and structure of a double girder overhead crane?

A double girder overhead crane is composed of several key components, including the bridge frame, lifting trolley, crane traveling mechanism, and electrical system. The bridge frame consists of two girder beams, typically box-type, which are supported by an end truck on each side. The electric hoist trolley runs on a rail installed above the bridge girders. This design provides higher stability and the ability to handle heavier capacities and longer spans compared to single girder cranes.

What are the typical load capacities and span ranges for double girder overhead cranes?

Double girder overhead cranes are available in a wide range of load capacities, typically from 5 tons to 500 tons. The span of these cranes can vary from 4.5 meters to 31.5 meters, or even be customized up to 55 meters depending on the manufacturer and specific requirements. The lifting height can also be customized but generally ranges from 3 to 60 meters.

What are the advantages of using a double girder overhead crane over a single girder crane?

Double girder overhead cranes offer several advantages over single girder cranes. They have higher stability and can handle heavier rated lifting weights and longer spans, making them suitable for heavier-duty applications. The double girder design also provides stronger wind-resistant performance and can be customized to fit various operating conditions. Additionally, these cranes often feature advanced design elements such as beehive beam structures and unique steel pin connections, which enhance their reliability and efficiency.

How do double girder overhead cranes differ in terms of operation and maintenance compared to single girder cranes?

Double girder overhead cranes differ significantly from single girder cranes in terms of operation and maintenance. Due to their complex structure and larger weight, double girder cranes require more complicated installation and maintenance procedures. They often need workers to control the operation, and their higher technical content means they have a higher production cost. However, they offer smoother operation, lower noise, and anti-corrosion features, which can reduce daily maintenance needs in the long run.

In what industries and applications are double girder overhead cranes commonly used?

Double girder overhead cranes are widely applicable in various industries due to their robust design and high lifting capacities. They are commonly used in steel plants, oil industries, plastic plants, cement plants, power plants, mine industries, food industries, chemical industries, cable plants, machine tool manufacturing, car and truck industries, transport companies, construction companies, electrical companies, and shipyards. Their versatility and ability to handle heavy loads make them essential in any environment requiring heavy-duty lifting and moving operations.