When choosing a crane for your factory, one of the most critical decisions is selecting the right and matching overhead crane. Among them, single vs double girder crane offer unique advantages and features, and understanding these differences will help ensure you choose the most efficient, cost-effective, and safe solution for your lifting needs. Next, this article will delve into the comparison between single vs double girder crane, so that you can choose the lifting equipment suitable for your production environment.
What is a Single Girder Crane?
A single girder crane is a type of lifting equipment with a single main girder as its primary load-bearing structure. It is typically equipped with an electric hoist as the lifting mechanism, and is used to lift and transport materials horizontally. Its simple structure, light weight, easy installation and maintenance, and low manufacturing and transportation costs make it suitable for lifting small and medium-sized tonnages and moderate spans. It is widely used in factories, warehouses, and repair shops, offering a cost-effective and practical lifting solution.
Structure and Design
A single girder crane is mainly composed of a main beam, two end beams, a running mechanism, a trolley or an electric hoist, and other components. The main beam is a box beam or I-beam, which has high strength and rigidity. The two end beams are connected to both ends of the main beam to form a bridge structure. The trolley or electric hoist travels along the girder to lift and move loads.
Advantages and Features
Simple Structure: Lightweight, Low requirements structure for factory.
Low Cost: Lower manufacturing and transportation costs make it an economical choice.
Space-Saving: Requires no floor space and does not conflict with ground equipment.
Easy Installation and Maintenance: Simple structure and few parts make subsequent inspection and maintenance easier.
Small Footprint: Low overall height makes it suitable for space-constrained workshops or warehouses.
Wide Application: Suitable for lifting capacities from 1 to 32 tons and spans from 6 to 30 meters, meeting small to medium-sized material handling needs.
Diverse Control Options: Available with Remote Control, Ground Control, or cab control.
Safe and Reliable: Equipped with safety features such as limiters, buffers, and an anti-derailment device.
Disadvantages
Limited Lifting Capacity: Generally suitable for applications ranging from 1 to 32 tons, not suitable for heavy-duty work.
Working Class Low: Not suitable for frequent, high-intensity, or continuous heavy-load operations.
Poor Expandability: Cannot be configured with double hoist mechanisms or other complex accessories.
What is a Double Girder Crane?
A double girder crane is a type of overhead crane with two main beams as its primary load-bearing structure. A trolley runs above the main beams, working in conjunction with the lifting mechanism to lift and transport materials. Compared to single girder crane, double girder crane offer greater strength and rigidity, can carry greater loads and span longer distances, and offer more stable and reliable operation. They are suitable for applications requiring high tonnage and high-frequency operations, such as steel mills, machinery manufacturing, and energy.
Structure and Design
A double girder crane primarily consists of two main beams, two end beams, overhead running mechanism, trolley travel mechanism a lifting mechanism, and an electrical system, and other parts. The main beams are often welded box-shaped structures, offering high strength and rigidity. The trolley runs above the main beam rails, providing high load capacity and excellent stability. The lifting mechanism, typically a winch or wire rope hoist, can meet the demands of large-tonnage and long-span operations.
Advantages and Features
Large Lifting Capacity: With a lifting capacity ranging from 5 tons to 500 tons and even higher, it's suitable for lifting large and heavy materials.
Wide Coverage: With a span of up to 37.5 meters, it offers a wide operating area.
High Rigidity: The dual-girder design provides a sturdy structure with strong overall rigidity and stability.
High Operating Precision: The trolley runs on the main girder top rails, ensuring uniform force distribution and accurate positioning.
High Adaptability: It can be used with a variety of lifting spreader, including electromagnetic chucks, grabs, and hooks.
High Operating Performance: It can withstand high-intensity, frequent, and continuous operations, meeting the standards of demanding working conditions.
Strong Safety: Equipped with multiple safety devices such as anti-collision devices, limiters, and overload protection.
Excellent Scalability and Adaptability: It supports automated control and intelligent management.
Disadvantages
Site Requirements: Utilizing two main beams and a more robust structural design, High requirements are placed on the load-bearing capacity of the factory building and the tracks.
Higher Energy Consumption: Drive power and operating energy consumption are high, compared with a single girder crane, operating costs will increase.
Higher Initial Cost: Due to their more complex design and construction, double girder cranes typically have a higher initial cost compared to single girder cranes.
More Complex Installation: The installation process for double girder cranes is usually more time-consuming and complex than that of single girder cranes.
Increased Maintenance: With more components, double girder cranes may require more maintenance and upkeep than single girder cranes.
Key Differences Comparison
Load Capacity
Single girder cranes are generally used for small to medium-sized loads of 1-32 tons and have limited load capacity. Double girder cranes can lift loads from 5 tons to 500 tons or even higher, meeting the needs of heavy-duty work.
Span and Height
Double girder cranes generally offer a greater lifting height and span than single girder cranes. This is because the trolley and hoist system can be positioned between the two girders, allowing for more vertical space for lifting. Single girder cranes, on the other hand, have the trolley and hoist system mounted below the girder, limiting the available lifting height.
Cost and Installation
Single girder cranes usually have a lower initial cost, as well as a simpler and faster installation process. Double girder cranes more expensive and complex to install, provide greater capabilities and flexibility for heavy-duty applications.
Functional Scalability
Single girder cranes are typically equipped with an electric hoist, which has limited functionality. Double girder cranes can be equipped with a variety of lifting devices, including grab buckets, electromagnetic suction cups, and rotating hooks, offering more comprehensive functionality and greater adaptability.
Selection Recommendations
When choosing a single girder crane or double girder crane, you can consider a combination of factors such as working conditions, lifting capacity, plant conditions, and budget. The following are the selection recommendations listed by Minecranes for you:
Lifting Capacity: If your material handling needs are below 20 tons and the working class is low, a single girder crane can meet the needs. When the lifting capacity exceeds 25 tons, a double girder crane is more suitable.
Span and Lifting Height: Assess the vertical and horizontal space available in your factory, as well as the required scope of work.
Budget: Consider your budget constraints and weigh the initial cost against the long-term benefits and capabilities of each type of crane.
Installation and Maintenance: Consider the complexity of installation and ongoing maintenance.
Note: Specialized models are required for hazardous environments (explosion-proof, high-temperature, etc.). It is advisable to consult Minecranes teams for detailed guidelines and quotations.
Summarize
The above content introduces the single vs double girder crane, as well as its advantages, price. Companies should carefully consider and clearly define their lifting needs when selecting an overhead crane. If high lift capacities, large spans, and high lift heights are required, a double-girder overhead crane is a preferred solution, but the upfront costs may be higher. For applications requiring lower load capacities and lift heights and spans, single-girder cranes offer a cost-effective alternative, improving production or assembly efficiency and safety.
At Minecranes, we are a leading manufacturer of overhead cranes in China, with over 30 years of experience. We provide customized overhead crane solutions, ranging from light to heavy cranes, as well as European overhead cranes, suspension underhung cranes, and more. If you're interested in receiving a quote on an overhead crane or want to know its parameter information, contact us now.
