Hoist Double Girder Overhead Crane

A Hoist Double Girder Overhead Crane is a heavy-duty lifting solution where a hoist trolley moves across two bridge girders to lift, lower, and transport loads across large spans.
It's widely used in factories, workshops, warehouses, power plants, and steel production lines.

 

Key Characteristics:

Lifting Capacity: Standard models range from 5T to 550T, with custom designs exceeding 1000T.

Span: Typically 7.5m–35m, extendable for large facilities.

Lifting Height: Up to 30m (higher with customized drum systems).

Hoist Types:

Electric Wire Rope Hoist: Common for heavy loads (e.g., 10T–550T).

Chain Hoist: For lighter loads or compact spaces.

Explosion-Proof Hoist: For hazardous environments (e.g., oil refineries).

 

Advantages Over Single-Girder Cranes

Feature	Double Girder with Hoist	Single Girder
Load Capacity	5T–550T+	1T–20T
Lifting Height	Up to 30m+	Limited by underhung design
Precision	±1mm positioning (with VFD)	±5mm typical
Duty Cycle	FEM M5–M8 (A6–A8)	FEM M3–M4 (A3–A5)
Lifespan	25–30 years (with maintenance)	15–20 years

 

Core Components：Bearing, Gearbox, Motor, Pump

Place of Origin：Henan, China

Warranty：1 Year

Weight (KG)：2000 kg

Video outgoing-inspection：Provided

Machinery Test Report：Provided

Design：Double beam

Effectiveness：high efficiency

Operating speed：High speed operation

Stability：Anti-swing function

Color：Optional

Power Source：110V/220V/230V/380V/440V,customized

Span：7.5-31.5m

 

 

A Hoist Double Girder Overhead Crane is a heavy-duty lifting solution where a hoist trolley moves across two bridge girders to lift, lower, and transport loads across large spans.
It's widely used in factories, workshops, warehouses, power plants, and steel production lines.

1. Double Main Girders

Two strong horizontal beams (bridge) that support the hoist trolley and distribute the lifted load across a wide area.

2. End Carriages (End Trucks)

Located at both ends of the crane; contain the travel wheels and motors for crane movement along runway rails.

3. Hoist Trolley

Compact lifting unit that travels along the girders; houses the hoisting mechanism (motor, gearbox, drum, rope, and hook).

 

4. Lifting Mechanism (Hoist)

Motorized system inside the trolley, including the motor, brake, gearbox, drum, wire rope, and hook assembly, responsible for raising and lowering the load.
5. Trolley Travel Mechanism

Motors, gearboxes, and wheels that drive the hoist trolley horizontally across the double girders.

 

 

6. Crane Travel Mechanism

Motors and gearboxes installed on end trucks that move the entire crane along the building's runway rails.
7. Electrical System

Supplies and controls electrical power for lifting, traveling, and crane motion; includes power distribution panels, control circuits, and festoon/cable systems.

 

8. Operator Control

Options include pendant control, wireless radio remote control, or a driver's cabin with joysticks.
9. Power Supply System

Power transmission through festoon system, cable reel, or conductor bars depending on crane design.

10. Hook Block

Final lifting component attached to the rope; engages with the load via hooks or specialized lifting attachments.
11. Safety Devices

Overload limiters, emergency stop buttons, lifting limit switches, travel limit switches, anti-collision devices, and alarms.

 

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12. Braking System

High-performance brakes installed on lifting and traveling motors to ensure immediate and safe stopping.
13. Buffers and End Stops

Shock-absorbing devices installed at the ends of crane and trolley travel paths to prevent accidents.

 

SKETCH

Main technical

 

 

Advantages of Hoist Double Girder Overhead Crane

Higher Lifting Capacity – Can handle heavier loads (typically 10 tons to 500+ tons) compared to single girder cranes.

Increased Span & Hook Height – Provides better coverage in large workshops and higher lifting clearance.

Greater Stability & Durability – Double girders distribute weight evenly, reducing deflection and ensuring smoother operation.

Versatility – Supports various lifting attachments (hooks, magnets, grabs) for different industrial needs.

Better Load Control – Equipped with precise hoisting and trolley mechanisms for safer material handling.

Longer Service Life – Robust construction reduces wear and tear, lowering maintenance costs.

Customization Options – Can be designed with additional features like automation, remote control, or explosion-proofing.

 

Applications of Double Girder Overhead Cranes

Steel & Metal Industry – Handling heavy steel coils, sheets, and molten metal in foundries.

Power Plants – Lifting turbines, generators, and heavy machinery during maintenance.

Automotive Manufacturing – Moving car chassis, engines, and large assembly parts.

Construction & Heavy Engineering – Transporting pre-fabricated structures and heavy construction materials.

Shipbuilding & Ports – Assembling ship components and loading/unloading cargo.

Aerospace Industry – Handling large aircraft parts during manufacturing and assembly.

Warehousing & Logistics – Managing bulky or heavy inventory in large storage facilities.

Mining & Cement Plants – Moving raw materials, crushers, and heavy equipment.

 

 

The production procedure for a 50-ton double beam overhead crane involves several key stages, from design to final testing. Below is a step-by-step outline of the typical manufacturing process:

1. Design & Engineering
Requirements Analysis: Determine client specifications (span, lifting height, duty cycle, power supply, etc.).

CAD Modeling: Create 3D models and detailed drawings for structural and mechanical components.

Load Calculations: Verify strength, deflection, and stability under dynamic/static loads.

Regulatory Compliance: Ensure adherence to standards (ISO, FEM, DIN, ANSI, or CMAA).

2. Material Procurement
Main Beams: Steel plates (Q235B/Q345B) for welded box girders or rolled sections.

End Carriages: Fabricated from steel profiles for rigidity.

Hoist & Trolley: Procure or manufacture components (gearbox, motor, wire rope, hooks, brakes).

Electricals: Motors, control panels, festoon/cable reels, limit switches.

3. Fabrication of Main Components
A. Double Girder Fabrication
Cutting & Welding: Steel plates are cut (laser/plasma) and welded into box girders.

Annealing: Stress-relieving to prevent distortion.

Machining: Drilling holes for connections and machining rail surfaces.

B. End Carriages
Assembly: Wheels, buffers, and drive mechanisms are mounted.

Alignment: Ensure parallel tracks for smooth movement.

C. Hoist & Trolley
Assembly: Gearbox, motor, drum, and brake systems are integrated.

Load Testing: Pre-testing of hoisting mechanism.

4. Surface Treatment
Shot Blasting: Clean surfaces for paint adhesion.

Priming & Painting: Anti-corrosion coatings (epoxy/zinc-rich).

5. Electrical System Installation
Wiring: Install power/signal cables along the crane bridge.

Control Panel: Fit VFDs (for variable speed), overload protectors, and PLCs (if automated).

Safety Devices: Limit switches, emergency stop, and overload protection.

6. Assembly & Integration
Erection: Girders are joined to end carriages; trolley and hoist are mounted.

Alignment: Verify wheel track parallelism and rail clearances.

Lubrication: Apply grease to gears, bearings, and moving parts.

7. Testing & Inspection
A. Factory Acceptance Tests (FAT)
No-Load Test: Run trolley/hoist across full span at all speeds.

Load Test:

Static Test: 125% rated load (50 ton → 62.5 ton) for 10 minutes.

Dynamic Test: 110% load (55 ton) with repeated lifts/movements.

Safety Checks: Verify brakes, limit switches, and emergency stops.

B. Final Inspection
Dimensional accuracy, weld quality, and electrical safety.

8. Disassembly & Packaging
Labeling: Mark components for easy onsite reassembly.

Protection: Waterproof wrapping for shipping.

9. Onsite Installation & Commissioning
Rail Alignment: Ensure runway rails are level and parallel.

Reassembly: Erect girders, install electricals, and calibrate.

Final Testing: Repeat load tests under client supervision.

10. Documentation & Handover
Manuals: Operation, maintenance, and parts manuals.

Certificates: Test reports, material certifications, and compliance documents.

 

Workshop view:

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.