50t Double Girder Overhead Crane

 

 

A 50t Double Girder Overhead Crane is a heavy-duty lifting solution designed for industrial applications requiring high load capacity, precision, and durability. Below are its key features, components, and typical applications:

Key Features:
Capacity: 50 metric tons (can be customized for higher loads).

Double Girder Design: Two main girders provide enhanced strength and stability compared to single-girder cranes.

Span: Adjustable (typically 10–35 meters, depending on workshop requirements).

Lifting Height: Customizable (usually 6–30 meters).

Duty Class: A5 (Moderate) to A6 (Heavy Duty) for frequent use in demanding environments.

Control Options: Pendant control, radio remote control, or cabin-operated.

Safety Features: Overload protection, limit switches, emergency stop, and anti-collision systems.

 

 

Comparison: QD Double Girder vs. Single Girder

Feature	Double Girder	Single Girder
Capacity	5–550+ tons	1–20 tons
Span	Up to 35m+	Up to 15m
Hook Height	Higher	Lower
Cost	Higher initial cost	More economical
Durability	Heavy-duty	Light to medium-duty

 

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 50ton double girder overhead crane is a heavy-duty lifting system used in industrial settings like steel plants, shipyards, and large manufacturing facilities. Here are its key components:

1. Bridge Structure
Main Girders (2 Nos.) – Primary load-bearing beams (box or truss type) supporting the crane's total load.

End Trucks (2 Nos.) – Steel frames with wheels that allow the crane to move along the runway rails.

Cross Beams – Provide lateral stability between the girders.

2. Hoisting Mechanism
Hoist Motor – Powers the lifting operation (typically AC or DC).

Wire Rope & Drum – Lifts and lowers the load (may include multiple falls for 50T capacity).

Hook Block – Heavy-duty lifting hook with pulley system.

Braking System – Ensures safe load control (disc or drum brakes).

3. Trolley Mechanism
Trolley Frame – Moves horizontally along the bridge girders.

Trolley Motor & Drive – Facilitates cross-travel motion.

Wheels & Rail – Guides trolley movement.

 

4. End Trucks & Runway System
Wheels (4 or more) – Run on the crane runway rails.

Buffers / Bumpers – Absorb impact at travel limits.

Runway Beams – Support the crane's movement (mounted on columns or building structure).

5. Electrical System
Control Panel / Cabin / Pendant – Operator interface (radio remote or cabin control).

Festoon / Conductor Bars – Power and signal transmission.

Limit Switches – Prevent over-travel of hoist and trolley.
 

 

 

 

6. Safety Components
Overload Limiter – Prevents lifting beyond 50T capacity.

Emergency Stop (E-Stop) – Instantly cuts power in emergencies.

Anti-Collision System – Used in multi-crane setups.

Anemometer (if outdoors) – Monitors wind speed for safe operation.

 

 

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7. Additional Features (Optional)
Crane Weigh Scale – Integrated load measurement.

Variable Frequency Drives (VFDs) – Smooth acceleration/deceleration.

Magnetic or Grab Attachments – For specialized lifting.

 

 

50t Double Girder Overhead Crane is designed with multiple safety components to ensure safe and reliable operation, complying with European standards (EN 13001, EN 14492, FEM, and others). Below are the key safety components typically included:

 

1. Load Limiting Devices
Overload Limit Switch – Prevents crane operation if the load exceeds the rated capacity.

Load Cell / Weighing System – Monitors the load in real-time to prevent overloading.

2. End Limit Switches
Hoisting Upper/Lower Limit Switch – Stops the hoist when the hook reaches the maximum or minimum safe height.

Trolley & Bridge Travel Limit Switches – Prevents the crane from over-traveling at the ends of the runway.

3. Emergency Stop (E-Stop)
Push-Button Emergency Stop – Installed on the pendant control or cabin for immediate shutdown in emergencies.

4. Anti-Collision System
Laser/Ultrasonic Sensors – Detects obstacles or other cranes to prevent collisions (used in multi-crane systems).

RFID/Zoning Systems – Ensures safe working zones in automated environments.

5. Braking Systems
Fail-Safe Brakes (Mechanical & Electromagnetic) – Automatically engage in case of power failure.

Hoist Holding Brake – Prevents unintended lowering of the load.

6. Electrical Safety Components
Undervoltage Protection – Prevents unexpected restart after power failure.

Phase Sequence & Power Loss Protection – Ensures correct power supply phasing.

Short-Circuit & Overcurrent Protection – Circuit breakers and relays for electrical safety.

7. Mechanical Safety Features
Buffer & Bumper Devices – Absorbs impact at the end of travel.

Rail Clamps / Anchoring Devices – Secures the crane when not in use (for outdoor cranes).

8. Operator Safety Features
Cabin with Safety Interlocks – Ensures safe entry/exit and operation.

Pendant Control with Enclosed Buttons – Prevents accidental activation.

Non-Slip Walkways & Guardrails – For safe maintenance access.

9. Monitoring & Alarms
Warning Horn & Beacon Lights – Alerts personnel before crane movement.

Crane Monitoring System (CMS) – Tracks performance and detects faults.

10. Redundancy in Critical Systems
Dual Braking System – Backup brakes for hoisting mechanisms.

Secondary Rope Retainer – Prevents rope slippage in case of failure.

 

 

SKETCH

Main technical

 

 

 

A 50ton double girder overhead crane is a heavy-duty lifting solution designed for industrial applications requiring high capacity, precision, and durability. Here are its key advantages:

1. High Load Capacity (50 Tons & Beyond)
Designed to handle heavy loads (50 tons or more) efficiently, making it ideal for steel plants, foundries, shipyards, and heavy machinery industries.

Can be customized for even higher capacities if needed.

2. Enhanced Stability & Durability
Double girder design provides superior strength and rigidity compared to single girder cranes.

Better load distribution, reducing stress on the crane structure.

Built with high-quality steel for long-term reliability in harsh environments.

3. Greater Hook Height & Lifting Range
The double girder design allows for higher hook height, maximizing vertical workspace.

Ideal for applications requiring deep lifting (e.g., in foundries or large fabrication shops).

4. Advanced Control & Precision Handling
Equipped with variable frequency drives (VFD) for smooth acceleration/deceleration, minimizing load swing.

Precision positioning for delicate or high-value loads.

Options for remote control & automation for safer and more efficient operations.

5. Customizable Features
Multiple hoisting mechanisms (single/double hoist).

Specialized hooks, grabs, or magnets for different materials (steel, scrap, containers).

Explosion-proof, heat-resistant, or corrosion-resistant variants for extreme conditions.

6. Reduced Maintenance & Long Service Life
Robust construction reduces wear and tear.

Sealed bearings & high-grade components minimize downtime.

Easy access for inspection and maintenance.

7. Safety Features
Overload protection to prevent accidental overloading.

Limit switches & emergency stop for safe operation.

Anti-collision systems (for multiple cranes in the same bay).

8. Cost-Effective for Heavy Industries
Higher initial cost than single girder cranes, but offers better ROI due to durability, efficiency, and reduced downtime.

Ideal Applications:
Steel & metal processing

Shipbuilding & offshore industries

Power plants & heavy machinery

Large-scale construction & logistics

Conclusion:
A 50-ton double girder overhead crane is a powerhouse for heavy lifting, offering strength, precision, and reliability in demanding industrial environments. Its high load capacity, stability, and customization options make it a top choice for heavy-duty applications. 

 

 

A 50ton Double Girder Overhead Crane is a heavy-duty lifting solution designed for industrial applications requiring high load capacity, precision, and durability. Below are its key applications, features, and benefits:

Applications:
Steel & Metal Industry

Handling steel coils, plates, and heavy molds.

Loading/unloading raw materials in foundries.

Power Plants

Lifting turbines, generators, and heavy machinery during maintenance.

Shipbuilding & Ports

Moving large ship components and containers.

Heavy Machinery Manufacturing

Assembling large equipment like presses, mining machinery, and hydraulic systems.

Automotive Industry

Transporting heavy vehicle parts, presses, and assembly lines.

Construction & Infrastructure

Handling precast concrete segments, bridge components, and structural beams.

Mining & Cement Plants

Moving bulk materials, crushers, and kiln parts.

 

 

The production procedure for a 50ton Double Girder Overhead Crane involves several key stages, from design and material procurement to assembly and testing. Below is a detailed step-by-step overview of the manufacturing process:

1. Design & Engineering
Customer Requirements Analysis: Determine span, lifting height, duty class (FEM/ISO), and operational environment.

CAD Modeling: Create 3D designs for the bridge girders, end carriages, hoist, and trolley.

Structural Calculations: Verify load capacity, deflection limits, and compliance with standards (ISO, DIN, FEM, or CMAA).

Electrical & Control System Design: Plan motor power, wiring, and safety features (limit switches, overload protection).

2. Material Procurement
Main Beams: High-quality steel plates (Q235B/Q345B) for box girders or rolled sections.

End Carriages: Fabricated from steel with welded or bolted construction.

Hoist & Trolley: Procure gearboxes, motors, wire ropes, hooks, and brakes.

Electrical Components: Motors, control panels, festoon systems, and sensors.

3. Fabrication of Key Components
A. Double Girder Fabrication
Cutting & Welding: CNC plasma cutting of steel plates, followed by submerged arc welding (SAW) for girders.

Precision Machining: Drill holes for connections and runway beams.

Shot Blasting & Painting: Surface treatment for corrosion resistance (primer + topcoat).

B. End Carriages
Welded Assembly: Fabricate wheel blocks, buffers, and connection points.

Wheel Installation: Mount forged steel wheels with bearings.

C. Trolley & Hoist
Frame Construction: Build trolley frame to support the 50t hoist.

Hoist Integration: Install wire rope drum, motor, gearbox, and hook block.

4. Assembly
Bridge Assembly: Join two girders with end carriages using high-strength bolts or welding.

Trolley Mounting: Place the trolley on the bridge rails; ensure smooth movement.

Electrical Wiring: Install power supply (festoon or conductor bars), control panels, and safety devices.

5. Testing & Quality Control
Load Testing:

No-load Test: Check motor, brake, and movement functions.

Static Load Test: 125% of SWL (62.5t) to verify structural integrity.

Dynamic Load Test: 110% of SWL (55t) for operational performance.

Safety Checks: Inspect limit switches, emergency stops, and overload protection.

Certification: Issue test reports (per ISO 9001 or local regulations).

6. Disassembly & Packaging
Dismantle crane for shipping (if required).

Protect components with anti-rust coatings and sturdy packaging.

7. Installation & Commissioning
On-site Assembly: Reassemble girders, install runway beams, and align rails.

Final Testing: Verify smooth operation under load at the customer's facility.

Training: Train operators on controls and maintenance.

 

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%.