Traveling Overhead Crane

Advantages

Space Optimization

Utilizes overhead space, keeping floor area clear

Minimal footprint compared to mobile cranes

Precision Handling

Smooth load positioning (±10mm accuracy)

Ideal for delicate or high-value loads

Workflow Efficiency

Reduces material handling time by 50-70%

Enables just-in-time manufacturing processes

Safety Features

Fail-safe brakes

Overload protection

Emergency stop systems

Anti-collision systems (for multiple cranes)

 

Operational Characteristics

Load Capacity: 1 ton to 500+ tons

Span: Typically 10-35 meters (custom spans available)

Lifting Height: Up to 30+ meters

Travel Speeds:

Bridge: 10-60 m/min

Trolley: 5-30 m/min

Hoist: 0.5-10 m/min

A traveling overhead crane consists of multiple integrated components that work together to provide safe and efficient material handling. Here's a detailed breakdown of all major components and their functions:

1. Primary Structural Components

Bridge Structure

Main Girder(s) - Single or double box-type beams that span the work area

Single girder: For lighter loads (up to 20 tons)

Double girder: For heavier loads (20-500+ tons)

End Trucks - Steel frames with wheels that move along runway rails

Include drive motors, brakes, and wheel assemblies

Anti-derailment devices standard

 

Runway System

Runway Beams - Heavy steel I-beams or box beams supporting the crane

Top-running (most common) or underhung configurations

Runway Rails - Precision steel tracks (usually ASCE or DIN standards)

Support Columns - Structural steel posts or building columns

May include seismic bracing in earthquake zones

2. Lifting Mechanism

Hoist Unit

Electric Hoist (most common):

Geared motor with drum or disc brakes

Wire rope or chain lifting medium

Rated for specific duty cycle (H3-H4 common)

Hydraulic Hoist (for heavy loads):

Cylinder-based lifting system

Used in steel mills and foundries

Trolley Assembly

Motorized Trolley:

Drive motor with speed reducer

Travel wheels with flanges

Guide rollers for smooth movement

Manual Trolley (light duty only)

 

3. Motion Systems

Bridge Drive System

Drive Motors (typically 2-4 motors)

AC or DC powered

Common power: 3-phase 415V 50Hz or 480V 60Hz

Speed Reducers - Gearboxes with proper ratio

Wheel Assemblies - Forged steel wheels with replaceable treads

Trolley Drive System

Similar components to bridge drive but smaller scale

May include anti-sway technology

4. Control & Electrical Systems

Power Delivery

Festoon System - Cable management for moving power

Conductor Bars - Enclosed power rails (for heavy duty)

Bus Bar System (for very large cranes)

 

Control Devices

Pendant Control Station:

IP65 rated for industrial environments

Emergency stop, speed control

Radio Remote Control:

2.4GHz frequency hopping technology

Safety-rated systems available

Cabin Control (for very large cranes)

5. Safety Components

Load Monitoring

Load Cells - For weight measurement

Overload Limit Switch - Prevents >110% rated load

Movement Safety

Buffer & Bumper Systems - End-of-travel protection

Anti-Collision Systems - For multiple cranes

Limit Switches - All axes of movement

Emergency Systems

Fail-Safe Brakes - Spring-applied, electrically released

Emergency Stop Circuits - Redundant systems

Undervoltage Protection

6. Optional Components

Specialty Features

Crane Scales - Integrated weighing

Automation Packages - PLC control, positioning

LED Work Lights - For low-light areas

Heating Systems - For cold environments

Special Environment Packages

Explosion-Proof - For hazardous areas

Corrosion-Resistant - Marine environments

High-Temperature - Foundry applications

Sketch

Main technical

 

 

Traveling overhead cranes offer numerous benefits for industrial and commercial applications, making them indispensable in material handling operations. Here are the key advantages:

1. High Load Capacity & Precision Handling

Capacity Range: From 1 ton to 500+ tons, suitable for both light and extremely heavy loads.

Precision Control: Smooth operation with ±10mm positioning accuracy, ideal for delicate or high-value loads.

2. Optimal Space Utilization

No Floor Obstruction: Operates overhead, keeping ground space free for other operations.

Full Coverage: Moves along runways to cover the entire length and width of a workspace.

3. Improved Efficiency & Productivity

Faster Material Handling: Reduces manual labor and speeds up workflows by 50-70%.

Automation-Ready: Can integrate with PLC controls, RFID tracking, and robotic systems.

4. Enhanced Safety Features

Overload Protection: Prevents lifting beyond rated capacity.

Anti-Collision Systems: Ensures safe operation when multiple cranes are used.

Fail-Safe Brakes: Spring-applied brakes engage during power loss.

5. Durability & Low Maintenance

Robust Construction: Made from high-grade steel with corrosion-resistant coatings.

Long Service Life: Properly maintained cranes can last 25-30+ years.

Modular Design: Easy to repair or upgrade components.

6. Customizable for Specific Needs

Adjustable Span & Height: Can be tailored to fit different facility layouts.

Specialized Configurations: Available for hazardous, high-temperature, or corrosive environments.

7. Cost-Effective Operation

Lower Labor Costs: Reduces reliance on forklifts and manual labor.

Energy-Efficient Motors: Modern VFD-controlled drives minimize power consumption.

 

 

Traveling overhead cranes are used across various industries due to their versatility and efficiency. Below are the most common applications:

1. Manufacturing & Assembly Plants

Automotive Industry: Lifting car frames, engines, and heavy molds.

Machinery Manufacturing: Handling large CNC machines and industrial equipment.

2. Warehousing & Logistics

Loading/Unloading: Moving heavy pallets, containers, and storage racks.

Just-in-Time (JIT) Systems: Efficiently positioning materials for production lines.

3. Steel & Metal Processing

Steel Mills: Transporting coils, slabs, and molten metal ladles.

Foundries: Handling castings and dies in high-heat environments.

4. Power Generation & Heavy Industry

Turbine Installation: Lifting and positioning massive generators and rotors.

Nuclear Plants: Handling radioactive materials with specialized cranes.

5. Aerospace & Defense

Aircraft Assembly: Moving wings, fuselage sections, and engines.

Shipbuilding: Installing large ship components in dry docks.

6. Construction & Infrastructure

Prefab Concrete Handling: Transporting large precast segments.

Bridge Construction: Positioning steel girders and heavy materials.

7. Mining & Heavy Machinery

Excavator & Crusher Maintenance: Lifting massive mining equipment.

Mineral Processing: Handling ore and bulk materials.

 

The production procedure for a 45-ton Double Girder Overhead Crane involves several key stages, from design to final testing. Below is a detailed step-by-step overview:

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1. Design & Engineering

Load & Span Calculation: Determine crane capacity (45 tons), span (distance between rails), lifting height, and duty cycle (FEM/ISO classification).

Structural Design:

Main girders (box-type or truss design)

End carriages (for movement along rails)

Hoist and trolley mechanism

Electrical & Mechanical Design:

Motor power, gearbox, brakes, and control system

Wiring, pendant/radio remote control, or cabin operation

Software & Simulation: Finite Element Analysis (FEA) for stress testing.

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2. Material Procurement

Steel Plates & Profiles: High-quality Q235B/Q345B steel for girders.

Electrical Components: Motors (hoist/travel), brakes, limit switches, and control panels.

Mechanical Parts: Wheels, gears, wire ropes, hooks, and bearings.

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3. Fabrication of Main Components

A. Double Girder Fabrication

Cutting & Welding: CNC plasma cutting for precision; automatic submerged arc welding (SAW) for girders.

Assembly: Align and weld girders with end carriages.

Shot Blasting & Painting: Anti-rust treatment (primer + topcoat).

B. Hoist & Trolley Assembly

Hoist Mechanism:

45-ton electric wire rope hoist (or chain hoist).

Drum, motor, gearbox, and brake assembly.

Trolley Frame: Fabrication and mounting of wheels, motors, and rails.

C. End Carriages

Frame Construction: Welded steel with wheel assemblies.

Buffers & Bumpers: Installation for collision protection.

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4. Electrical System Installation

Wiring & Controls:

Power supply (3-phase AC)

Variable Frequency Drives (VFDs) for smooth operation

Pendant/remote control system

Safety Devices:

Overload limiter

Limit switches (upper/lower travel)

Emergency stop

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5. Assembly & Integration

Erection of Girders: Mount double girders onto end carriages.

Trolley & Hoist Installation: Position trolley between girders; secure hoist.

Rail Alignment: Ensure runway rails are level and parallel.

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6. Testing & Quality Control

A. Factory Testing (Before Shipment)

No-Load Test: Run crane without load to check movement, brakes, and controls.

Load Test:

Static Test: 1.25 × rated load (56.25 tons) for 10 mins.

Dynamic Test: 1.1 × rated load (49.5 tons) with movements.

Safety Checks: Verify limit switches, emergency stop, and overload protection.

B. On-Site Testing (After Installation)

Re-run load tests under customer supervision.

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7. Painting & Corrosion Protection

Final Coating: Weather-resistant paint (e.g., epoxy zinc-rich primer).

Markings: Labels for load capacity, warnings, and manufacturer info.

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8. Packaging & Delivery

Disassembly (if needed): For easy transport.

Packaging: Waterproof wrapping for sea/land shipping.

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9. Installation & Commissioning (On-Site)

Runway Beam Inspection: Ensure proper alignment and strength.

Crane Assembly: Reassemble girders, hoist, and electrical systems.

Final Testing: Conduct load tests and operator training.

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%.