Ldp Type Double Beam Overhead Crane

Overview

Type: LDP (typically refers to a specific design or series by a manufacturer).

Structure: Double girder (two main load-bearing beams).

Operation: Overhead (moves along runway beams mounted on building structures or freestanding supports).

Capacity: Generally ranges from 5 tons to over 500 tons, depending on design.

Span: Customizable to facility needs (typically 5m to 35m).

Lifting Height: Adjustable (standard is 6m–30m).

 

Advantages

High Capacity: Double girders provide greater strength for heavy loads.

Durability: Robust construction for harsh environments (e.g., steel mills, foundries).

Precision: Smooth lifting and positioning (critical for manufacturing/assembly).

Customization: Adaptable span, height, and control options.

Space Efficiency: Maximizes vertical space compared to floor-mounted cranes.

 

Comparison with Other Crane Types

Feature	LDP Double Beam Crane	Single Girder Crane	Gantry Crane
Max Capacity	500+ tons	20 tons	300+ tons
Span Flexibility	5–35m+	3–25m	5–50m+
Floor Space Use	None (overhead)	None (overhead)	Requires leg space
Precision	High (anti-sway)	Moderate	Moderate
Cost	Higher (heavy-duty)	Lower (light-duty)	Medium

 

parameter

Capacity 5t–500t+
Span 5m–35m
Lifting Height 6m–30m
Work Duty A5–A8 (ISO/FEM standards)
Power Supply 380V/415V, 50/60Hz
Ambient Temp. -20°C to +40°C

An LDP Type Double Beam Overhead Crane is a heavy-duty lifting system designed for industrial applications requiring high capacity, precision, and durability. Below is a detailed breakdown of its key components:

 

1. Main Load-Bearing Structure

A. Double Girders (Main Beams)

Box Girder Design (welded steel construction for heavy loads).

Truss Girder Design (lighter but strong, used for long spans).

Capacity Range: Typically 5–500+ tons.

Span: Adjustable (usually 5–35m).

B. End Trucks (End Carriages)

Wheel Assemblies – Steel wheels with bearings for smooth runway movement.

Drive Motors – Power longitudinal travel (along the runway).

Buffers/Bumpers – Absorb impact at travel limits.

2. Hoisting & Trolley System

A. Hoist Unit

Electric Wire Rope Hoist (common for heavy-duty use).

Chain Hoist (for lower capacities or hazardous environments).

Drum & Rope/Chain – High-strength lifting medium.

B. Trolley Assembly

Trolley Frame – Moves horizontally across the girders.

Trolley Drive Motor – Powers transverse (cross-girder) movement.

Guide Rollers – Ensure alignment on the girders.

3. Runway System

Runway Beams – Supported by building columns or freestanding frames.

Rail Tracks – Precision-aligned for smooth crane movement.

Crane Rail Clamps – Secure the crane when not in use (safety feature).

4. Power & Control Systems

A. Control Options

Pendant Control (wired or wireless handheld remote).

Cabin Control (operator cab mounted on the crane).

Automated Control (PLC-based for smart factories).

B. Electrical Components

Festoon System – Manages power/signal cables along the crane.

Variable Frequency Drive (VFD) – Ensures smooth acceleration/deceleration.

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

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5. Safety Components

Overload Limiter – Blocks operation if load exceeds capacity.

Limit Switches – Prevent hoist/trolley over-travel.

Anti-Sway System – Minimizes load swing (for precision lifting).

Anemometer (for outdoor cranes) – Detects high wind speeds.

6. Optional Features

Weighing System – Integrated load measurement.

Remote Monitoring – IoT-enabled diagnostics.

LED Work Lights – For low-visibility areas.

Cabin HVAC – For operator comfort in extreme environments.

Sketch

Main technical

 

 

1. High Load Capacity & Durability

Handles 5–500+ tons, ideal for heavy industries like steel mills and shipyards.

Double girders provide superior strength compared to single-girder cranes.

2. Long Span & Customizable Design

Supports 5–35m spans, suitable for wide workshops.

Adjustable lifting height (up to 30m) and modular components for flexibility.

3. Precision & Stability

Anti-sway systems ensure smooth load positioning.

Stiff double-beam structure minimizes deflection under heavy loads.

4. Enhanced Safety Features

Overload protection, limit switches, emergency brakes, and anti-collision systems.

Fail-safe mechanisms for critical operations (e.g., molten metal handling).

5. Low Maintenance & Long Lifespan

Robust construction reduces wear and tear.

Easy access for inspections and part replacements.

6. Automation & Smart Control Options

Can integrate with PLC, remote monitoring, and IoT for Industry 4.0 applications.

Variable Frequency Drives (VFDs) ensure smooth speed control.

7. Space Efficiency

Uses overhead space, freeing up floor area for operations.

No need for ground obstructions like gantry crane legs.

 

1. Steel & Metal Industry

Handling steel coils, slabs, ladles, and molten metal.

Used in rolling mills, foundries, and forging plants.

2. Power Plants & Heavy Machinery

Lifting turbines, generators, and transformers.

Maintenance of large equipment in hydro/nuclear plants.

3. Shipbuilding & Ports

Moving ship sections, containers, and heavy cargo.

Dockyards and dry docks for assembly and repairs.

4. Automotive & Aerospace

Transporting engine blocks, fuselage parts, and heavy molds.

Used in assembly lines and production halls.

5. Mining & Cement Industry

Handling large crushers, kilns, and bulk materials.

Heavy-duty operations in harsh environments.

6. Warehousing & Logistics

Lifting heavy pallets, machinery, and oversized loads.

Used in large storage facilities and distribution centers.

7. Construction & Infrastructure

Precast concrete handling (beams, columns, bridge sections).

Heavy material movement in large construction sites.

1. Design and Engineering
Confirm technical specifications (load capacity, span, lifting height).

Structural design of main beams, end carriages, trolley, and hoisting system using CAD and FEA software.

Electrical and control system layout design.

Compliance checks with relevant standards (ISO, FEM, OSHA).

2. Material Procurement
Source high-quality steel plates, structural steel sections, motors, electrical components, limit switches, and safety devices.

Verify material certifications and quality standards.

3. Fabrication of Main Components
Cutting & Shaping: Use CNC plasma cutting or laser cutting for steel plates.

Welding: Assemble main beams, end carriages, trolley frames using precise welding techniques.

Heat Treatment: Stress relief welding distortion by heat treatment if required.

Machining: Machine wheel seats, bearing seats, shaft holes, and motor mounting points.

Surface Treatment: Sandblasting and applying primer, then coating with anti-corrosion paint.

4. Assembly of Mechanical Parts
Assemble main beams with end carriages.

Install wheelsets and axle assemblies.

Mount trolley frame and hoisting mechanism (drum, wire rope, hook block).

Install brakes and gearbox on motors.

5. Electrical System Installation
Install motors (hoist, trolley, bridge travel).

Mount electrical panels, control cabinets.

Wire all sensors, limit switches, alarms, and control devices.

Connect power cables and control cables.

6. Quality Control & Testing
Non-destructive testing (NDT): Weld inspections by ultrasonic or magnetic particle methods.

Dimensional inspection: Check critical dimensions and tolerances.

Electrical tests: Insulation resistance, continuity, and control circuit tests.

Load testing: Perform static and dynamic load tests at 100% and 125% rated load.

Functional testing: Test all crane movements, alarms, safety devices, and control systems.

7. Painting and Finishing
Final painting for corrosion resistance and aesthetics.

Apply safety markings and labels.

8. Packaging and Delivery
Disassemble components if needed for transport.

Secure packaging to avoid damage during shipment.

Prepare manuals, certificates, and test reports.

9. Installation and Commissioning (On-site)
Assemble crane components on-site.

Align rails and fix end stops.

Connect power supply and control system.

Conduct on-site testing and operator training.

Final acceptance and handover.

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%.