5t LDA Type Overhead Crane

 

The LDA type overhead crane is a standardized single-girder electric overhead traveling crane with specific components designed for efficient material handling. Here's a detailed breakdown of its key components:

1. Main Structural Components

Main Girder (Single)

Typically made of rolled steel I-beam or welded box girder

Designed with optimized cross-section for strength and weight balance

Includes reinforcement plates at stress concentration points

End Trucks (End Carriages)

Steel frame structures with integrated drive mechanisms

Contain wheel assemblies for movement along runway rails

Feature anti-derailment safety devices

2. Hoisting Mechanism

Electric Hoist Unit

Standard configurations use CD/MD type wire rope hoists

Includes:

Hoist motor (dual-speed options available)

Gear reducer

Drum assembly with wire rope

Hook block with safety latch

Upper/lower limit switches

Trolley Frame

Steel construction with rollers for girder travel

May include manual or motorized traverse mechanism

Equipped with buffer devices at both ends

3. Traveling Mechanism

Bridge Drive System

Two driving wheels (one per end truck)

Equipped with:

Travel motors (typically 0.4-3.0kW)

Brake systems

Gear reducers

Coupling devices

Runway System

Includes crane rails (usually P24/P38 standard)

Rail clamps for parking security

Conductors or festoon systems for power supply

4. Electrical System

Power Supply Components

Sliding collector system or cable festoon arrangement

Main circuit breaker and control panel

Overload and short-circuit protection

Control System

Pendant control station (standard IP54 protection)

Control buttons for:

Hoist up/down

Bridge left/right travel

Trolley forward/backward (if motorized)

Emergency stop button

5. Safety Devices

Standard Safety Features

Overload limiter (mechanical or electronic)

Double-limit switches for hoisting

Travel limit switches for bridge movement

Warning devices (buzzer/horn)

Phase protection relay

Optional Safety Upgrades

Anti-collision system for multiple cranes

Voltage protection device

Infrared protection for work area

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6. Auxiliary Components

Buffers and Bumpers

Rubber or spring-type buffers at bridge ends

Trolley end stops

Maintenance Features

Inspection platforms (on larger models)

Lubrication points with centralized system options

7. Optional Customizations

Special Configurations

Explosion-proof components (motors, electricals)

Stainless steel construction for corrosive environments

Variable frequency drives for smoother operation

Remote control systems (radio/wireless)

 

Sketch

 

Main technical

 

1. Cost-Effective Solution

Lower initial investment compared to double girder cranes

Reduced installation and foundation costs

Minimal maintenance requirements

2. Space-Saving Design

Compact structure ideal for facilities with height limitations

Requires less headroom than double girder cranes

Optimal for workshops with limited space

3. Energy Efficient Operation

Lower power consumption

Energy-saving motor options available

Reduced operational costs

4. Easy Installation & Maintenance

Simple modular design for quick assembly

Standardized components for easy replacement

Accessible maintenance points

5. Versatile Performance

Smooth operation with precise load positioning

Adaptable to various lifting requirements

Suitable for diverse industrial environments

6. Reliable Safety Features

Standard overload protection

Dual-limit switches for hoisting

Emergency stop functionality

Anti-collision options available

 

1. Manufacturing Facilities

Assembly line operations

Machine part handling

Production material transfer

2. Warehousing & Logistics

Loading/unloading goods

Pallet and container handling

Storage management

3. Automotive Industry

Engine and component handling

Vehicle assembly support

Parts warehouse operations

4. Construction Material Handling

Steel beam positioning

Prefabricated part movement

Building material distribution

5. Light Industrial Applications

Food processing plants

Packaging facilities

Small-scale production lines

6. Maintenance & Repair Shops

Equipment installation

Machinery servicing

Facility maintenance tasks

 

1. Design & Engineering
Requirement Analysis: Confirm load capacity, span, lift height, automation level, control mode, and safety features based on customer needs.

Structural Design: Design the single girder main beam, end carriages, trolley, and hoist assembly using CAD software.

Electrical & Control Design: Develop control system schematics including PLC programming, motor selection, VFDs, sensors, alarms, and safety interlocks.

Simulation & Validation: Use FEA (Finite Element Analysis) for structural integrity and dynamic simulation for motion control.

2. Material Procurement
Source high-quality steel (Q345B or equivalent) for main beam and components.

Acquire motors, hoists, VFDs, PLCs, limit switches, and alarm systems from trusted suppliers.

Ensure all components meet relevant certifications and standards (ISO, CE, GB).

3. Main Beam Fabrication
Cutting: Steel plates cut to size using CNC flame/plasma cutting machines.

Forming: Roll or shape plates into the I-beam or box girder profile.

Welding: Perform welding of flanges, web, and stiffeners following welding procedure specifications (WPS).

Heat Treatment: Stress relief if necessary to reduce welding deformation.

Machining: Drill holes for end carriage and trolley mounting; machine crane rails if integrated.

Inspection: Check weld quality (X-ray or ultrasonic), dimensions, and surface finish.

4. End Carriage & Trolley Assembly
Frame Fabrication: Cut and weld end carriage frames and trolley frames.

Wheel Assembly: Mount wheels and fit bearings; assemble drive motor and gearbox.

Installation: Attach wheels to frames and mount brakes and limit switches.

Testing: Static and dynamic tests on wheels and brakes for smooth rotation and load bearing.

5. Hoist Assembly
Assemble wire rope or chain hoist on the trolley.

Install hook block, safety latch, load limiter, and load sensors.

Connect hoist motor, gearbox, brake, and encoders.

Conduct functional tests on hoisting speed, lifting capacity, and braking.

6. Electrical Wiring & Control System
Install motor cables, control cables, and communication lines.

Mount PLC, VFDs, contactors, and safety relays in the control cabinet.

Wire limit switches, alarms, emergency stop, and sensors.

Program PLC with automated control logic, safety interlocks, and diagnostics.

7. Surface Treatment
Cleaning: Remove rust, oil, and debris from all steel parts.

Primer Coating: Apply anti-corrosion primer.

Final Paint: Spray high-durability industrial paint to protect against wear and corrosion.

Curing: Allow proper drying time to ensure finish quality.

8. Pre-Installation Testing
No-Load Tests: Run crane, trolley, and hoist without load to verify movement, speed, and control.

Load Test: Perform rated load test per standards to ensure lifting capacity and structural integrity.

Safety Device Check: Verify operation of overload limiter, limit switches, emergency stop, and alarms.

Automation Validation: Test automated sequences, positioning accuracy, and sensor feedback.

9. Packing & Shipping
Disassemble parts if necessary for transport.

Protect components with rust-proofing, padding, and secure packing.

Prepare documentation including user manuals, maintenance guides, and test certificates.

10. Installation & Commissioning (On-Site)
Reassemble crane components at customer site.

Align crane rails and secure runway structure.

Connect power and control wiring.

Calibrate sensors and test automated control functions.

Train operators and maintenance personnel.

Hand over documentation and certification.
 

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%.