Double Girder Gantry Crane Introduction

What is a double girder gantry crane?

A double girder gantry crane is a heavy-duty lifting equipment widely used in heavy industries. Its main girder is composed of two box-shaped or truss beams, supported on the ground rails by legs, resembling a "gate", and is capable of lifting and transporting operations in three-dimensional space above a rectangular site. Known for its stability, efficiency, and strong lifting capacity, it is suitable for large-scale projects such as ports, railways, shipyards, and steel plants.

Components of double girder gantry cranes

A double girder gantry crane is composed of main gantry frame, operating and lifting mechanism, and electrical control system. Each of these three metal mechanism, there are some other components as below.

• Main gantry frame

The main gantry frame is the main framework that forms the shape of the gantry crane and bears all the loads.

Main girder: It is the main load-bearing and force-transmitting component of the double girder gantry crane. The double-girder gantry crane has two parallel main beams that directly support the lifting trolley. It has two structural styles - box girder and truss girder. The advantage of box girder is high rigidity, good stability, mature manufacturing process, suitable for various working environments. The advantage of truss girder is light weight and low wind resistance, and is often used in large-span and outdoor environments where strict requirements are imposed on the self-weight.

Outriggers: It supports the main girder of gantry crane and transfer all the loads to the ground rail.

Ground beam: It connects the bottoms of the two outriggers to form a stable frame for the gantry.

End beam: It locates at both ends of the main beam, it is used to securely connect or interlock the main beam with the supporting legs.

Crane cab: It is the working space for the gantry crane operator. It is usually suspended below or on one side of the main beam, and requires good visibility, safety and comfort.

Walkway platform: The passageways and guardrails set along the main beams facilitate the safe passage of maintenance and repair personnel.

• Operating and Lifting mechanism

Lifting system: The lifting system realizes the vertical lifting and lowering of heavy objects, which is the most fundamental and crucial mechanism of a double girder gantry crane. The lifting system is equipped with hoist trolley or winch trolley. Either hoist trolley or winch trolley is composed of drive motor, reducer, drum, wire rope, pulley block assembly, hook assembly, and brake.

Trolley travel mechanism: It drives the lifting trolley to move laterally (perpendicular to the direction of the main girder track) along the track of the main girder to adjust the position of the hook in the width direction. It includes trolley frame, wheels, drive motor, reducer, brake, etc.

Crane trolley running mechanism: It drives the entire gantry crane to move longitudinally along the ground rail, covering the entire working area.

• Electrical control system

The electrical control system supplies current to the entire double-girder gantry crane, providing power and also responsible for safety protection. It is usually composed of a power introduction device, a control core, and a safety protection system. The power introduction device typically uses sliding wires or cables. Sliding wires are the most commonly used power supply devices on double-girder gantry cranes, and they draw power from the bare copper wires laid along the track using collectors. Cables are usually used in situations with short moving distances or special conditions. The control core is usually operated by the driver's cab or remote controller to control the operation of the gantry crane, using resistance boxes to regulate speed and limit starting current, and using PLCs for logical control, fault diagnosis, and protection. At the same time, a frequency converter is used as a key component to achieve soft start, soft stop, and stepless speed regulation of the motor, making the operation extremely smooth and significantly reducing mechanical shock. The safety protection system usually includes overload limiters, travel limiters, buffers and end stop blocks, wind protection devices, and emergency stop switches, etc to keep safe.

What are the advantages of double girder gantry cranes?

1. Superior Lifting Capacity

The double girder gantry crane adopts a double girder design, enabling it to handle extremely heavy loads compared to single girder cranes. This structure ensures balanced stress distribution and supports lifting capacities that can exceed hundreds of tons, making it an ideal choice for large industrial applications.

2. Excellent Structural Stability

Double girders provide enhanced rigidity and resistance to deformation. Even under continuous high-intensity operation, the double girder gantry crane maintains outstanding stability. This feature ensures safety, reliability, and minimal vibration during lifting and moving heavy objects.

3. Larger Span and Coverage

The double girder gantry crane supports wide spans, enabling it to cover larger working areas. This flexibility allows enterprises to handle oversized loads, manage complex workflows, and reduce the need for multiple smaller cranes, ultimately improving space utilization and efficiency.

4. Enhanced Safety Features

Equipped with advanced control systems, overload protection, anti-collision devices, and emergency stop mechanisms, the gantry crane ensures safe operation. Its robust design reduces risks in demanding environments such as steel plants, construction sites, and shipyards.

5. High Efficiency and Productivity

With smooth hoisting mechanisms and precision controls, the gantry crane improves working speed while reducing downtime. Its ability to handle bulk materials and oversized components efficiently results in significant cost savings for enterprises.

6. Durability and Low Maintenance

Built with high-strength steel and advanced manufacturing techniques, the MGO double girder gantry crane delivers long service life. Its durable design minimizes wear and tear, while accessible components make routine maintenance easier and less costly.

7. Versatile Applications

From port container handling to heavy machinery assembly, the MGO gantry crane adapts to diverse operational requirements. Its versatility makes it a preferred choice across industries requiring both lifting power and precision.

8. Cost-Effectiveness in the Long Term

Although initial investment may be higher than smaller cranes, the MGO double girder gantry crane provides better performance, lower operational risks, and reduced equipment redundancy. Over time, this translates into substantial savings and greater return on investment.

Compare with single girder gantry crane

According to the structure, gantry crane could be divided into single girder gantry crane and double girder gantry crane. To knowing about the difference between them better, here is a form of listing the difference as below.  

Reference list of double girder gantry crane cases

• 1 set 70 ton double girder semi gantry crane for sale to Kenya

• 2 sets 20 ton MGO type double girder gantry cranes for sale to the United Arab Emirates

• 2 sets 25/5 ton MGO type double girder gantry cranes for sale to the United Arab Emirate

• 2 sets 90 ton double girder gantry cranes for sale to Iraq

• 1 set 25/10 ton MGO type double girder gantry crane for sale to Kazakhstan

• 1 set 32 ton double girder gantry crane for sale to 1 Albania

• 3 sets 32 ton double girder gantry cranes for sale to Uzbekistan

• 1 set 30 ton European type double girder semi gantry crane for sale to Uzbekistan

• 2 sets 32/5 ton and 50/12 ton double girder gantry cranes for sale to Uzbekistan

• 1 set 32/10 ton double girder gantry crane for sale to Uzbekistan

How to select one suitable double girder gantry crane for the warehouse?

To select one suitable double girder gantry crane, the key parameters need to be provided to the crane manufacturer.

Lifting capacity: the rated lifting capacity of the main hook / auxiliary hook

Span: the distance between the center lines of the two rails

Lifting height: the vertical distance between the upper and lower limit positions of the hook

Working class: determined based on the frequency of use and load rate (A1 - A8)

Operating speed: speed of the crane trolley, the winch trolley, and the lifting mechanism

Operating environment: indoor/outdoor, temperature, humidity, whether there are special requirements such as explosion-proof or anti-corrosion

Rail model: the required rail specifications to be compatible

Summary

Henan Dejun Industrial Co., Ltd. attaches great importance to safety in the design and manufacture of double-girder gantry cranes. Safety is not just a slogan; it is achieved through our dozens of specific technologies and designs, aiming to enable your production to achieve maximum efficiency while maintaining absolute safety. If you have any questions, please feel free to contact us at any time.