MG Double-Girder Gantry Crane

MG Double Girder Gantry Crane

• Lifting Capacity: 5-800 ton
• Span: 18-35 Meters
• Lifting Height: 10-12 Meter
• Hoisting Mechanism: Electric Trolley
• Certificate: CE/ISO
• Warranty: 3-5 years

MG double girder gantry crane is a rail-mounted portal crane with two parallel main girders and an A-shaped leg structure, rated for 5–800 ton lifting capacity, 18–35 m span, and 10–12 m lifting height at working grade A5 (ISO 4301). It serves three primary sectors: general manufacturing, logistics and warehousing, and outdoor heavy-industry yards. Every unit carries CE certification under Machinery Directive 2006/42/EC and conforms to ISO 9001:2015.

MG double girder gantry crane is a rail-mounted portal lifting machine that uses two parallel box-section main girders supported by an A-shaped rigid leg structure on both sides. The A-type leg geometry distributes lateral wind and seismic loads more evenly than straight-leg designs, making this configuration the standard choice for outdoor yards and open-bay facilities exposed to variable weather.

The crane travels on ground-level rails; the electric trolley runs along the top flange of both main girders. As a result, the hook can access the full working width of the span — from 18 m to 35 m — without any blind zones. The 5–800 ton capacity range covers everything from moderate workshop lifts to heavy outdoor equipment handling.

For very large spans beyond 35 m or ultra-heavy marine applications, see U-Type Gantry Crane, which uses a wider leg spacing designed for shipyard and offshore berth conditions.computer technology and sensor systems to improve positioning accuracy. That optimize load handling processes, and enhance overall safety.

Engineering Features of A-type Gantry Crane

A-shaped leg structure — the angled leg geometry increases lateral moment of inertia by approximately 30% compared with straight-leg equivalents, improving resistance to wind and horizontal crane travel forces per GB/T 3811.

Box-section double main girders — FEA-verified before fabrication; deflection stays within L/1000 at rated load per EN 13001, ensuring electric trolley rails remain geometrically aligned across the full span.

Working grade A5 (ISO 4301) — designed for moderate to heavy duty cycles, covering typical outdoor yard operations of 8–12 working hours per day under varying load spectra.

Inverter-controlled electric trolley — smooth acceleration and deceleration reduce dynamic shock on slings and lifted components; positioning accuracy reaches ±15 mm in standard mode.

Pendant, wireless remote, and optional cabin control — operators choose the control method that best matches safe viewing angle and distance from the lift.

Anti-corrosion coating to ISO 12944-5 category C3/C4 — standard for outdoor and mildly corrosive industrial environments; C5-M marine grade available on request.

Wind load resistance — rated to 20 m/s operating wind speed and 35 m/s storm-lock condition per GB/T 3811, with rail clamps engaging automatically on anemometer signal.

The A5 duty class and 5–800 ton range make this crane a versatile workhorse across four sectors:

General Manufacturing and Fabrication

Machine tool builders, pressure vessel fabricators, and structural steel shops use A-type double girder gantry cranes for inter-process material transfer, sub-assembly staging, and finished product dispatch. The 18–35 m span covers most single-bay factory layouts. Moreover, the double-girder construction allows the trolley to travel below the top rail, maximising usable hook height within a given building height.

Logistics, Warehousing, and Rail Terminals

Outdoor freight terminals and rail container yards specify A-type gantry cranes for heavy pallet and bulk-goods handling. The cantilever extension variant reaches railcar side doors and truck flatbeds simultaneously, reducing repositioning cycles. As a result, dwell time per lift falls significantly compared with mobile crane alternatives.

Infrastructure and Precast Concrete Production

Precast yards producing bridge beams, retaining wall panels, and tunnel segments use A-type gantry cranes to move freshly cast elements from the mould bed to the curing yard and onto transport vehicles. The 800 ton upper capacity covers the heaviest precast bridge beam segments in current production. to explore related civil and infrastructure crane solutions.

Power Generation and Heavy Equipment Assembly

Generator manufacturers, transformer builders, and wind turbine assembly contractors use A-type double girder cranes for rotor and stator assembly, core stacking, and finished unit dispatch. In this context, the dual-hoisting-point variant handles asymmetric loads — transformer cores, rotor shafts — that a single trolley cannot balance safely.