European Electric Double-Girder Crane QDhs
The QDhs European-Style Electric Double-Girder Crane covers a lifting capacity range of 10–100t with a maximum span of 31.5m. Built on a compact European design philosophy, the crane achieves a 20–35% reduction in dead weight compared to conventional QD-type double-girder bridge cranes. It is equipped with a purpose-built European hoisting mechanism (integrating the hoisting motor, gearbox, and brake into a single unit), and both the trolley and crane bridge come standard with inverter drives for smooth operation and precise positioning. Kelude Heavy Industry has delivered over 300 units of this series, widely used for material handling in steel, metallurgy, machinery manufacturing, warehousing, and logistics industries.
The QDhs European-Style Electric Double-Girder Crane is a next-generation electric double-girder bridge crane developed by Kelude Heavy Industry, building on advanced European crane technology adapted to the actual operating conditions of domestic industrial facilities. By incorporating the compact design principles of European lifting equipment, modular design methods, and FEA optimization, the crane achieves significant lightweighting without compromising structural strength — the dead weight is reduced by 20–35% and the maximum wheel load by 15–25% compared to conventional QD-type double-girder bridge cranes, effectively lowering the load requirements on the crane runway girders.
Compared to traditional QD-type double-girder bridge cranes, the QDhs European-Style Electric Double-Girder Crane offers outstanding advantages including low headroom, lightweight design, maintenance-free operation, and a low failure rate. Components can be sourced from reputable domestic brands or imported options (ABM motors from Germany, SEW-Eurodrive gearboxes, Danfoss frequency inverters, etc.), providing excellent flexibility. This crane model is widely used in steel mills, power plants, machining workshops, warehousing and logistics centers, with a lifting capacity of 10–100t, a maximum span of 31.5m, and multiple operation modes including cab operation, radio remote control operation, and pendant control.
Core Advantages of the QDhs European-Style Electric Double-Girder Crane Hoisting Mechanism
The hoisting mechanism of the QDhs European-Style Electric Double-Girder Crane features a compact European design that integrates the hoisting motor, gearbox, brake, and drum into a single unit. Compared to conventional split-type hoisting mechanisms, it delivers the following core advantages:
Compact design maximizes working space: The overall height of the hoisting mechanism is reduced by 20–30% compared to conventional designs, minimizing the distance from the hook to the rail surface and providing greater effective lifting height within the same workshop height. This is particularly critical for retrofit projects in existing factory buildings with limited headroom — higher lifting requirements can be met without raising the roof.
Low-vibration, quiet operation: The hoisting motor is a squirrel-cage asynchronous motor (synchronous speed 3,000 rpm) with precision dynamic balancing, achieving a vibration level of ≤0.5 mm/s and noise of ≤72 dB(A) — well below the ≤85 dB(A) required by GB/T 14405.
Fast-response braking system: The electromagnetic disc brake is integrated with the motor, delivering a braking response time of ≤0.15s and a braking torque of ≥1.8× the rated torque, effectively preventing load slipping. The brake pads feature a self-adjusting design with automatic wear compensation; when pad thickness becomes insufficient, the control system triggers an automatic alarm for replacement. Brake pads have a normal service life of no less than 1,000,000 cycles and support at least 500 emergency braking events. The friction lining is asbestos-free and environmentally friendly.
Lifetime-lubricated gearbox: The gearbox uses hardened tooth flank ground gears (Grade 6 accuracy, 20CrMnTi carburized and quenched), pre-filled with long-life synthetic lubricating oil at the factory, requiring no maintenance under normal operating conditions. The specially designed rope guide ensures proper wire rope spooling and extends rope service life by over 50%.
Frequent inching protection: The control system includes built-in intelligent inching detection that continuously monitors operator usage patterns. When the interval between two inching operations is ≤0.5 seconds (i.e., inching too frequently), the system automatically extends the interval to approximately 2 seconds to protect the motor from overheating and burnout. This user-friendly design is especially valuable for hoisting applications that require frequent fine positioning.
Hoisting Motor Technical Features
The hoisting motor of the QDhs European-Style Electric Double-Girder Crane uses either a European-standard conical-rotor brake motor or a disc brake motor, with the following key technical characteristics:
| technology Indicator | Parameter/characteristics |
|---|---|
| Motortype | squirrel cageasynchronous motor(Synchronization Rotational speed3,000rpm) |
| Speed controlmode | Two-Speedor Frequency conversion Stepless control(1:10Speed controlratio) |
| Duty Classification | heavy duty, duty cycle60%ED |
| Braketype | electromagnetic disc brake, self-adjusting brake shoe, Wearself-compensating |
| Brakedesign | normally closed, and Motorintegrated design, Synchronization Braking |
| Braking torque | ≥1.8times rated Torque |
| brake lining life | normal service≥1,000,000 cycles, emergency Braking≥500times |
| Protection Rating (IP) | IP55, Fclass insulation |
| eco-friendly features | asbestos-free Friction lining, Sealing Dustproofdesign |
Technical Review by Kelude Heavy Industry
"The QDhs European-style electric double-girder crane has demonstrated outstanding adaptability in the steel industry. In a continuous casting bay project for a major steel mill, we supplied six 32t/28m QDhs European-style double-girder cranes featuring imported SEW drives and Schneider electrics. Compared with a conventional QD-type solution, the dead weight per unit was reduced from 28.5t to 19.8t (a 30.5% reduction), which in turn lowered the civil construction cost of the crane runway girders by approximately 15%. Operational data shows that the inverter drive solution delivers roughly 25% energy savings over fixed-speed operation, saving about RMB 12,000 per crane annually. The hoisting mechanism's frequent inching protection has performed exceptionally well in ladle handling applications, with over 18 months of zero-fault operation to date."
— Zhang, Senior Engineer, Kelude Heavy Industry Technical Department
QDhs European-Style Electric Double-Girder Crane Specifications
The QDhs European-style electric double-girder crane offers a lifting capacity range of 10 to 100 tons (larger capacities available on request) and spans from 9 to 31.5 meters (customizable). Operation modes include cab operation, radio remote control operation, or pendant control. Kelude Heavy Industry provides complimentary site surveys and engineering design services to deliver the optimal configuration based on your specific operating conditions.
Standard Lifting Capacity Series: 10T, 16T, 20T, 25T, 32T, 40T, 50T, 63T, 80T, 100T
Standard Span Series: 9M, 10M, 12M, 13M, 16M, 19M, 20M, 22M, 25M, 28M, 30M, 31.5M
Standard Lifting Heights: 6M, 9M, 12M, 16M, 20M, 30M (custom heights available)
Work Duty / Classification: A5–A7 (ISO 4301 Cranes — Classification)
QDhs European-Style Electric Double-Girder Crane Selection Parameter Table
| Lifting Capacity (t) | recommended spanrange (m) | Standard Span (m) | Lifting Height (m) | Lifting Speed (m/min) | Long Travel Speed (m/min) | complete machine Power (k W) | complete machine Dead Weight (t) |
|---|---|---|---|---|---|---|---|
| 10 | 7.5~25.5 | 10.5/16.5/22.5 | 6/9/12/16 | 5/0.8 Two-Speed | 3~30 Frequency conversion | 12.7~14.9 | 6.3~21.3 |
| 16 | 7.5~28.5 | 10.5/16.5/22.5/25.5 | 6/9/12/16 | 4/0.6 Two-Speed | 3~30 Frequency conversion | 20.0~22.9 | 7.3~26.3 |
| 20 | 7.5~28.5 | 10.5/16.5/22.5/25.5 | 6/9/12/16 | 4/0.6 Two-Speed | 3~30 Frequency conversion | 21.4~23.0 | 7.9~28.0 |
| 25 | 9.0~31.5 | 13/19/22.5/28 | 6/9/12/16/20 | 4/1 Two-Speed | 3~30 Frequency conversion | 27.4~29.0 | 8.5~29.5 |
| 32 | 9.0~31.5 | 13/19/22.5/28 | 9/12/16/20 | 3/0.8 Two-Speed | 3~30 Frequency conversion | 29.0~31.0 | 10.7~33.3 |
| 40 | 10.0~31.5 | 13/19/22.5/28/31.5 | 9/12/16/20 | 4/0.7 Two-Speed | 3~30 Frequency conversion | 47.0~52.0 | 11.5~35.6 |
| 50 | 10.0~31.5 | 13/19/22.5/28/31.5 | 9/12/16/20 | 3.2/0.5 Two-Speed | 2~20 Frequency conversion | 50.0~53.0 | 13.4~43.1 |
| 63 | 10.0~31.5 | 13/19/22.5/28/31.5 | 9/12/16/20 | 2.4/0.4 Two-Speed | 2~20 Frequency conversion | 55.0~59.0 | 15.2~48.1 |
| 80 | 10.0~31.5 | 13/19/22.5/28/31.5 | 9/12/16/20 | 2.4/0.4 Two-Speed | 2~20 Frequency conversion | 60.0~69.0 | 18.0~51.2 |
| 100 | 12.0~31.5 | 16/19/22.5/28/31.5 | 9/12/16/20 | 1.5/0.3 Two-Speed | 1.5~15 Frequency conversion | 72.0~85.0 | 22.0~62.0 |
| 125 | 12.0~31.5 | 16/19/22.5/28/31.5 | 9/12/16/20 | 1.5/0.3 Two-Speed | 1.5~15 Frequency conversion | 88.0~98.0 | 27.0~72.0 |
| 150 | 13.0~31.5 | 16/19/22.5/28/31.5 | 9/12/16/20 | 1.0/0.2 Two-Speed | 1.5~12 Frequency conversion | 105.0~125.0 | 32.0~85.0 |
| 200 | 13.0~31.5 | 16/19/22.5/28/31.5 | 9/12/16/20 | 0.8/0.15 Two-Speed | 1.5~10 Frequency conversion | 140.0~180.0 | 42.0~110.0 |
Note: The data in the table above are reference values for standard configurations. Actual parameters vary depending on span, lifting height, and configuration. For lifting capacities ≥100t, the QD-type hoisting trolley structure (rather than the electric hoist solution) is recommended. For precise parameters and customized solutions, please contact the Kelude Heavy Industry technical department.
Four Core Advantages of European-Style Double Girder Cranes
1. Compact Design — Maximizing Space Utilization: Advanced design philosophy gives the QDhs European-style double-girder crane a lightweight structure and outstanding performance. By optimizing the main girder cross-section and end carriage structure, the hook's extreme travel distance (the limit distance from the hook to both sides of the crane rail) is reduced by 15–25% compared to conventional models, effectively improving space utilization. The compact structural design also allows customers to reduce factory building investment — under the same lifting capacity and span conditions, workshop height can be lowered by 0.5–1m, and runway beam load-bearing requirements are reduced by 20–30%.
2. Variable Frequency Drive — Fast and Smooth Material Handling: Standard configuration includes variable-frequency speed control for both the trolley and crane bridge, with a speed ratio of 1:10 and adjustable acceleration/deceleration (0.15–0.5m/s²). The VFD drive ensures smooth, shock-free crane operation with fast and precise positioning. Combined with the optional electrical anti-sway control, load sway is kept within ±50mm, significantly improving loading/unloading efficiency and safety. Dedicated VFDs with pre-set parameters designed specifically for crane applications make commissioning simple.
3. Maintenance-Free Design — Lowering Lifecycle Costs: Advanced technology is applied from design and material selection through to manufacturing processes. The hoisting gearbox is lubricated for life and requires no oil changes; the brake features a dustproof design with automatic adjustment and a safe service life exceeding 1 million cycles; drive gears are precision-machined with hardened and ground tooth surfaces (Grade 6 accuracy), ensuring long-term trouble-free operation. The overall design life of the crane is ≥20 years, and under normal operating conditions, annual maintenance costs are only 40–60% of those for conventional models.
4. Multiple Safety Protections: Standard features include an overload limiter (110% pre-alarm, 125% cuts off the hoisting up circuit), travel limit switches for all mechanisms (hoisting height limiter + crane bridge/trolley travel limits), emergency stop button, phase sequence protection, overload protection, and phase loss protection. Cab-operated models are equipped with additional safety devices such as an anemometer, walkway interlock switches, and an audible warning bell.
Applicable Industries and Selection Recommendations
Steel & Metallurgy Industry: The 32–80t QDhs model is suitable for ladle handling, billet transfer, and finished product loading/unloading in steelmaking shops, continuous casting bays, rolling mills, and billet yards. Optional configurations include heat-resistant type (ambient temperature ≤80°C) and metallurgical type (heat shield + dual brake + high-temperature resistant motor).
Machinery Manufacturing Industry: The 10–50t QDhs model is suitable for workpiece hoisting and process flow in heavy machinery workshops, assembly workshops, and mold shops. The variable frequency creep-speed configuration (infinitely adjustable lifting speed of 0.5–5m/min) is recommended for precise positioning and installation of large workpieces.
Warehousing & Logistics Industry: The 20–50t QDhs model, paired with C-hooks, plate lifting spreaders, or coil clamps, is suitable for loading/unloading operations in steel warehouses, coil yards, and port storage areas. Custom configurations for extra-high lifting heights (≥20m) are available.
Power & Energy Industry: The 50–100t QDhs model is suitable for generator installation and maintenance in hydroelectric power stations, nuclear power plants, and thermal power plants. Customized anti-corrosion coating systems (C4–C5 grade, EN ISO 12944) and explosion-proof configurations are available.
Frequently Asked Questions
Q: What are the main differences between the QDhs European-style double-girder crane and the conventional QD-type double-girder bridge crane?
A: The core difference lies in the design philosophy and component system. The QDhs model features a European-style compact design, achieving lightweight construction through FEA optimization (dead weight reduced by 20–35%), and is paired with a dedicated European-style hoisting mechanism (integrated motor + gearbox + brake). In contrast, the conventional QD type uses a split hoisting mechanism, which is heavier but easier to service. In simple terms: for the same 10t/22.5m specification, the QDhs model has a total dead weight of approximately 8.5t, while the conventional QD type weighs about 12t — a difference of roughly 30%. Kelude Heavy Industry can provide a detailed comparison and selection report for both options.
Q: What is the delivery lead time for European-style double-girder cranes, and how long does installation and commissioning take?
A: For standard specifications (lifting capacity ≤50t, span ≤25m), the delivery lead time is 25–30 working days. The installation and commissioning period is approximately 7 working days in total: 2 days for main girder and end carriage hoisting, 1 day for hoisting mechanism installation, 2 days for electrical system commissioning, 1 day for no-load and load testing, and 1 day for TSG inspection. Kelude Heavy Industry provides free on-site installation and commissioning for domestic projects, and for export projects, our technical team can be dispatched overseas for on-site guidance.
Q: Does the QDhs European-style double-girder crane require special equipment registration?
A: According to the Special Equipment Catalog and TSG 08-2017 standard, bridge cranes with a lifting capacity ≥3t are classified as special equipment and must be registered and subject to periodic inspection. The entire QDhs series (10–100t lifting capacity) falls within the scope of special equipment supervision. Kelude Heavy Industry provides the Factory Acceptance Test Report, Certificate of Conformity, and Type Test Report with the equipment, and assists customers in completing TSG installation supervision inspection and registration procedures.
Q: What is the price difference between imported and domestic configurations for European-style double-girder cranes?
A: The imported configuration (German ABM hoisting motor + SEW-Eurodrive gearbox + Danfoss VFD + Schneider electrics) is 15–25% more expensive overall than the domestic configuration (Jiangte/Huali motor + Guomao gearbox + Inovance VFD + Chint electrics). Kelude Heavy Industry recommends a "hybrid" approach — using imported brands for core transmission components (hoisting motor, gearbox) and domestic brands for the electrical system, keeping costs within a reasonable range while ensuring reliability. The specific price difference varies by capacity and configuration — please contact us for a detailed quotation.
The Kelude Heavy Industry QDhs European-style electric double-girder crane, with its compact design, lightweight structure, and excellent overall cost-performance ratio, is the preferred alternative to conventional QD-type double-girder bridge cranes. Whether for new factory construction or retrofit and upgrade of existing workshops, this model delivers significant value to customers by reducing civil construction investment and improving operational efficiency.
Further Reading: LHhs European-Style Electric Hoist Double Girder Crane | LX Type European Electric Single-Girder Suspension Crane
European Electric Single-Girder Suspension Crane
