A double girder overhead crane operates through a series of interconnected systems and components that work together to facilitate the lifting, lowering, and movement of heavy loads. The systems and components include: power supply, control system, bridge and trolley, hoist mechanism, lifting hooks and slings, safety devices etc.. The operation of a double girder overhead crane involves a complex interaction of mechanical, electrical, and safety systems, all controlled by the operator to perform lifting and material handling tasks efficiently and safely.
What Are The Two Basic Types Of Overhead Cranes?
Single-beam overhead crane
Single-beam bridge Overhead cranes are generally used in places with small spans and light lifting weights, and the working environment of single-beam bridge cranes is often relatively small.
Double-beam overhead crane
Double-beam bridge Overhead cranes have large spans, heavier lifting weights, brighter workplaces, and higher working levels.
Comparison of the differences between single-beam and double-beam bridge cranes
· Single-beam bridge Overhead cranes are generally used in places with small spans and light lifting weights, and the working environment of single-beam bridge cranes is often relatively small. Double-beam bridge Overhead cranes have large spans, heavier lifting weights, brighter workplaces, and higher working levels. Compared with single-beam Overhead cranes, double-beam bridge cranes are more widely used.
· Single-beam bridge Overhead cranes are lighter in weight, simpler in structure, and easier to install and disassemble. Double-beam bridge Overhead cranes have complex structures, large weights, and are relatively complex to install.
Single-beam bridge Overhead cranes have lower costs and use less materials. The cost is mainly determined by their span. Single-beam bridge Overhead cranes have smaller spans, one lifting beam, smaller lifting weight, shorter spans, and use less production materials and accessories, so single-beam bridge Overhead cranes are cheaper and have lower costs.
Double-beam bridge Overhead cranes have higher production costs, use more materials, and are time-consuming and labor-intensive. Double-beam bridge Overhead cranes have two lifting beams, larger lifting weight, larger spans, more materials and accessories, higher technical content, and more complicated production, so double-beam bridge Overhead cranes are more expensive and have higher production costs.
THE ADVANTAGES OF DOUBLE GRIDER OVERHAED CRANES
Increased Load Capacity: Double girder cranes are designed to handle heavier loads compared to single girder cranes. They are capable of lifting weights that can exceed several tons, making them ideal for heavy-duty applications.
Greater Rigidity and Stability: The double girder design provides increased rigidity and stability, which is essential for maintaining the crane's structural integrity when lifting heavy loads. This reduces the risk of deformation or failure under stress.
Enhanced Safety Features: Double girder cranes often come with advanced safety features such as overload protection systems, limit switches, and anti-collision devices that enhance the safety of the lifting operations.
Extended Hook Height: The double girder design allows for a higher hook height, which is beneficial for lifting loads to greater heights without the need for additional vertical space.
Durability and Longevity: Due to their robust construction, double girder cranes are built to last and can withstand the rigors of continuous heavy use, reducing the need for frequent replacements or repairs.
Versatility: These cranes can be customized with various types of hoists, trolleys, and lifting accessories to suit a wide range of lifting needs, making them highly adaptable to different work environments.
Improved Lifting Speed and Accuracy: Double girder cranes often have high-precision hoist systems that allow for smooth and accurate load control, which is crucial for operations that require precise placement of heavy loads.
Reduced Maintenance Costs: While the initial cost of a double girder crane is higher, their durability and reliability can lead to lower maintenance costs over time compared to less robust alternatives.
Higher Tolerance for Misalignment: Double girder cranes can better tolerate misalignment in the runway system, which can be a common issue in industrial settings, thus reducing the need for frequent adjustments.
Selection of crane type
The span, height, component weight and lifting project volume of the structure;
Construction site conditions;
The existing lifting equipment conditions of the company and the region;
Construction period requirements;
Construction cost requirements. In general, crawler cranes are suitable for ordinary single-layer prefabricated structures with large lifting projects, because crawler cranes do not have high requirements for the road surface, are easy to change and travel, and can travel under load. Truck cranes are less destructive to the road surface, and can be driven to the lifting site quickly and conveniently.
They are suitable for lifting prefabricated structures located in urban areas or with small project volumes.
For hoisting projects in remote areas, or with long distances or poor road conditions, simple lifting machinery such as single-leg pull-out poles, herringbone pull-out poles, and mast cranes can often be used to start work early, meet progress requirements, and have low costs.
For multi-story prefabricated structures, due to the high installation height of the upper components, large-capacity crawler cranes or ordinary tower cranes (rail-mounted or fixed) are often used.
