MGB Double-Girder Semi-Gantry Crane for High-Capacity Lifting

The MGB double-girder semi-gantry crane features a double-girder load-bearing structure. Compared with a single-girder semi-gantry crane, its two main girders distribute the trolley and lifted loads across both girders, providing higher load capacity and greater structural rigidity for medium-to-heavy material handling.

Equipped with a winch trolley as the lifting mechanism, the crane is suitable for intermittent and repetitive handling of equipment and materials. Compared with full gantry cranes with support legs on both sides, the double-girder semi-gantry design reduces ground-leg and rail occupation, making it well suited for existing workshop upgrades.

MGB Double-Girder Semi-Gantry Crane Advantages and Disadvantages

• Double-girder structure for higher loads: The double-girder design provides more stable load support and higher lifting capacity for medium-to-heavy loads, heavy equipment, and larger-span lifting operations.
• Flexible control options: Supports multiple control methods, including cabin control, pendant control, wireless remote control, and PLC interlocking control, to suit different operating distances and material-handling requirements.
• Multiple lifting device options: The MGB double-girder semi-gantry crane can be configured with hooks, grabs, electromagnetic lifting magnets, and other lifting devices to meet the lifting and transfer requirements of different material types.
• Optional cantilever structure: A cantilever can be added outside the supporting leg to transfer materials between the inside and outside of the crane span and expand the crane's working coverage. It can also be omitted where site space is limited.

MGB Double-Girder Semi-Gantry Crane Core Components

Open Winch Trolley

The open winch trolley runs between the two main girders for vertical lifting and cross travel. Its hoisting components can be configured according to capacity, lifting height, and duty class, with either single or main-and-auxiliary hoisting mechanisms available.

• Suitable for medium- and heavy-duty lifting: The hoisting mechanism can be configured according to load requirements, enabling the crane to handle higher capacities, greater lifting heights, and more demanding operating conditions.
• Greater configuration flexibility: Drum dimensions, reeving ratios, lifting speeds, and duty classes can be adjusted to suit different loads and operating cycles.
• Suitable for various industrial conditions: Configurations are available for outdoor, corrosion-resistant, explosion-proof, high-temperature, and specialized lifting applications, expanding the crane's application range.
• Convenient inspection and maintenance: The drum, wire rope, pulley system, brake, and transmission components are clearly arranged for easier inspection, maintenance, and replacement, supporting reliable long-term crane operation.

Crane Travel Wheel

The crane and trolley travel mechanisms of the MGB double-girder semi-gantry crane use wheels manufactured through a combined forging and rolling process. Crane dead weight, lifted loads, and operating forces are transferred to the rails through these wheels, so their material strength, manufacturing precision, and wear resistance directly affect the stability and reliability of heavy-duty operation.

• Withstand heavy wheel loads: The combined forging and rolling process helps compact the material structure, refine the grains, and reduce the effect of internal porosity on wheel strength, enabling the wheels to withstand loads generated during crane and trolley travel.
• Maintain product quality: The wheels are manufactured on an automated production line covering blank cutting, heating, forging, rolling, cooling, and inspection. This standardized process reduces manual and batch-to-batch variations while improving consistency in dimensions, forming quality, and material properties.
• Reduce operating wear: The combined forming process improves tread material properties and contact-fatigue resistance, reducing tread deformation and wear under heavy loads. This helps limit abnormal wear on both the wheels and rails and supports reliable long-term crane operation.

MGB Double-Girder Semi-Gantry Crane Selection Guide

The MGB double-girder semi-gantry crane is suitable for projects requiring greater lifting capacity and a semi-gantry runway arrangement. Confirm the following conditions when selecting the crane:

• The required lifting capacity, span, or duty class exceeds the available single-girder configuration.
• The project requires an upper-running winch trolley, a project-specific hoisting configuration, or optional main and auxiliary hoisting mechanisms.
• A suitable elevated workshop runway is available on one side, with sufficient space for a ground rail on the other side.

Case: MGB Double-Girder Semi-Gantry Crane Exported to Israel

An Israeli client needed to lift and transfer 16-ton loads indoors, requiring equipment covering a 10-meter span and a 6.65-meter lifting height, adaptable to repetitive daily operations. Larger loads generate more significant inertia during start-up, stopping, and lowering; therefore, the project needed to meet not only the rated lifting capacity but also operational control and the mechanism’s working capacity.

Based on these requirements, we provided a 16-ton MGB double-girder semi-gantry crane, configured to A5 overall machine duty class and M5 lifting mechanism duty class, supporting the project’s required load and work cycles. The equipment features fast and slow lifting speeds and adjustable trolley and crane travel speeds, maintaining handling efficiency during normal transfers and reducing speed as it approaches the target location for more controllable start-up, operation, and lowering.