QD/QB Type Double Girder Overhead Crane 5t-500t Heavy Duty Workshop Crane, Electric Hook Overhead Crane

The QD/QB double-girder bridge crane is the mainstream lifting equipment in heavy-duty industrial scenarios. It adopts a double-main-girder box-type structure and is equipped with a special lifting trolley and a winch-type lifting mechanism. It runs along the track on the top of the factory building to achieve precise three-dimensional lifting of heavy-duty materials. Compared with single-girder models, it has stronger rigidity, greater load-bearing capacity and higher stability. It is specially designed for heavy-load, large-span, and high-frequency operations from 5t to 500t. It is widely used in heavy-load conditions such as steel metallurgy, machinery manufacturing, mold processing, papermaking, port warehouses, and power station construction. It is an efficient and safe core lifting equipment for heavy-duty workshops.

 

Key Advantages 

- Heavy Duty & High Strength: Integrated welding of double box-type main beams, Q345B high-quality steel, high strength, anti-eccentric load, anti-deformation, rated lifting capacity of 5t-500t, suitable for lifting ultra-heavy materials.

- Super Stability & Precision: The double-girder structure has excellent rigidity, the cart/trolley runs smoothly, the lifting weight swings small, and the positioning accuracy is high. It is suitable for precision operations such as precision assembly and mold handling.

- Long Service Life: Key components are annealed to eliminate internal stress, high-quality wear-resistant parts, and the entire machine is treated with anti-rust and anti-corrosion treatment to adapt to high-frequency continuous operations. The service life is more than 30% longer than that of a single beam.

- Safety & Multi-Protection: Standard overload limit, rise and fall limit, stroke limit, buffer, windproof anchor, electrical overload/short circuit/phase loss protection, emergency braking,

- Flexible Control & Customization: Supports cab control, wireless remote control, and ground buttons; can customize special functions such as frequency conversion speed regulation, explosion-proof, insulation, electromagnetic, grab, and double trolleys.

 

Main Structure 

- Double Main Girders: Box-type structure, automatic welding, overall annealing, high strength and high rigidity, ensuring no deformation under long-term heavy load.

- End Beams: Rigidly connected to the main beam, using a three-in-one drive motor, with smooth operation, low noise, reliable braking, and long life.

- Hoist Trolley: winch-type lifting mechanism, double drum/single drum, cast steel pulley, wear-resistant steel wire rope, suitable for heavy-load, high-frequency, high-lifting height operations.

- Lifting Mechanism: Hard tooth surface reducer, brake motor, safety brake, smooth lifting, reliable braking, and easy maintenance.

- Electrical Control System: PLC programmable control, optional variable frequency speed regulation (VFD), smooth operation, accurate positioning, complete protection, and low failure rate.

- Cabin & Control: Enclosed driver's cab, equipped with seats, air conditioner, fan, lighting, and linkage console, with wide field of view and comfortable operation.

 

Item	Standard Range	Customizable
Lifting Capacity	5t/10t/16t/20t/32t/50t/75t/100t–500t	1t–800t
Span	6m–36m	3m–50m
Lifting Height	6m–20m	3m–50m
Lifting Speed	0.5–10m/min	Variable frequency adjustable
Trolley Speed	10–40m/min	Variable frequency adjustable
Crane Travel Speed	15–45m/min	Variable frequency adjustable
Duty Class	A5–A7 (FEM 2M–4M)	A8 (Extra heavy duty)
Power supply	380V 50Hz 3P	220V/415V/440V/60Hz
Working Temperature	-20℃ ~ +40℃	-40℃ ~ +60℃

 

Applications 

- Steel & Metallurgy Plants: Lifting and transporting steel billets, steel products, and molten iron ladles

- Heavy Machinery & Mold Factories: handling of large equipment, molds, and castings

- Paper & Sugar Mills: paper rolls, sugar packets, heavy material lifting

- Power Plants & Hydropower Stations: generator sets, gates, equipment installation

- Ports & Logistics Warehouses: Containers, heavy cargo handling

- Automobile & Shipbuilding: car body, hull components, heavy-duty tool lifting

 

Optional Configurations 

- Lifting Devices: hooks, electromagnetic suckers, grab buckets, hanging beams, container spreaders

- Control System: Variable frequency speed regulation VFD, PLC control, remote monitoring, linkage console

- Safety Devices: anti-collision sensor, anemometer, limiter, overload protection, safety brake, sound and light alarm

- Special Types: explosion-proof type, insulating type, metallurgical type, double trolley, low headroom, high temperature resistance

- Cabin Accessories: air conditioners, fans, heaters, seats, intercoms, video surveillance

- Surface Treatment: Epoxy zinc-rich paint, polyurethane paint, hot-dip galvanizing, heavy anti-corrosion coating

 

Packaging & Delivery 

- Packaging: The main beam/end beam is installed bare + rainproof cloth; electrical components, motors, and reducers are made of exported plywood wooden boxes; accessories are treated with waterproof and moisture-proof treatment.

- Transport: sea/land transportation, 20ft/40ft/40HQ container or bulk carrier, suitable for long-distance international transportation.

- Delivery Time: 15–30 days for standard type; 30–45 days for customized/heavy duty; expedited production is available.