QDX Type European Standard Double-Girder Bridge Crane

The QDX European Standard Double-Girder Bridge Crane is Kelude Heavy Industry's flagship overhead crane, developed to meet FEM/DIN international standards. Featuring an optimized European-style box-type twin main girder design with a compact trolley, it is equipped with a European Standard trolley hoist (two-speed/VFD), offering a lifting capacity range of 5–320t and spans up to 35m. Compared to the QD Type, the dead weight is reduced by 25–35%, significantly lowering wheel loads. For the same capacity, this can cut the cost of the factory building steel structure and foundation by 25–40%. This series has been widely deployed in heavy-duty lifting applications across heavy machinery manufacturing, metallurgy and steelmaking, hydropower stations, shipbuilding sections, and large mold workshops, with over 600 units delivered to date.

Q: How do I choose between the QDX, LHX, and QD double-girder bridge cranes?

A: Three decision factors — ① Lifting capacity: ≤80t → choose LHX (hoist-type, most cost-effective); >80t → QDX or QD (winch-type) is required. ② Duty intensity: A3–A5 → LHX or QDX; A6–A7 heavy duty → QDX or QD is required. ③ Infrastructure/energy optimization: For new plants or export projects, prioritize European-standard models (QDX with optimized main girder, LHX with compact hoist); for existing plants with budget sensitivity, QD is a solid choice. In short: light-to-medium duty + new plant → LHX; heavy duty + frequent operation → QDX; budget-sensitive + existing plant → QD.

Q: What's the fundamental difference between the QDX winch-type trolley and the LHX hoist-type?

A: The winch-type trolley combines a rope drum, independent reducer, and independent brake as separate components; the hoist-type integrates the drum, reducer, brake, and motor into a single compact unit. Key differences: ① Capacity ceiling — the hoist type is limited by internal gear and drum dimensions, with an economic ceiling around 80t; the winch type has independently designed components and can reach 320t and above. ② Reliability — the hoist type's high integration means repairs typically require full-unit replacement; the winch type allows each component to be serviced or replaced independently. ③ Auxiliary hook — the hoist type generally doesn't support an auxiliary hook; the winch type can integrate both main and auxiliary hooks on a single trolley (significantly improving operational efficiency). ④ Duty classification — the hoist type tops out at A5; the winch type can achieve A7 (metallurgical grade).

Q: Can the QDX be used for metallurgical crane applications (molten steel ladle handling)?

A: Yes, but it requires metallurgical crane-specific configuration: ① Duty classification upgraded to A6 or A7 (meeting GB/T 3811-2008 metallurgical crane requirements); ② A second brake added to the hoisting mechanism (dual-brake redundancy — if either brake fails, the other can independently stop the load); ③ Electrical system upgraded with over-temperature protection, high-temperature cables, and a positive-pressure explosion-proof operator cabin (optional); ④ Load-bearing structure designed with a 1.5× safety factor (higher than the 1.25× for general-purpose cranes). The QDX metallurgical configuration has passed Type Testing at the National Quality Supervision and Inspection Center for Hoisting and Transport Machinery, and complies with AQ 7011-2018 "Safety Regulations for Hoisting of High-Temperature Molten Metal."

Q: What are the lead times and technical support arrangements?

A: Standard models ship in 35–50 days; metallurgical/nuclear-grade special configurations add 15–25 days. Kelude Heavy Industry provides full life-cycle support: ① Engineering design — including steel structure load analysis, crane runway foundation drawings, power supply capacity calculations, and wind/seismic resistance verification; ② Manufacturing supervision — customer on-site inspection or third-party inspection (CCS/DNV/BV, etc.) can be arranged; ③ Installation & commissioning — certified professional installation team, covering crane runway rail installation, precision alignment, PLC programming, load testing, and Type Testing; ④ Warranty — 18 months on the complete crane, 30 months on critical components (reducers/brakes/motors); ⑤ Lifetime technical support with 24-hour after-sales response. The QDX series has been exported to 20+ countries across Southeast Asia, the Middle East, Africa, and South America.