Double Girder Crabe Trolley

Industrial Double Girder Crane Trolley Overview

Definition:

A double girder crane trolley is the lifting and traveling mechanism mounted on top of two parallel bridge girders in an overhead crane system. It includes the hoisting mechanism (electric wire rope hoist or winch) and the cross-travel mechanism, allowing it to move along the crane bridge and lift heavy loads.

Key Technical Features

Construction Components

1. Main Hoisting Motor

   • High-torque motor for lifting heavy loads

2. Wire Rope Drum

   • Precision-grooved for rope alignment

3. Gearbox

   • Heavy-duty reduction gears

4. Brake System

   • Electromagnetic or hydraulic brake for load holding

5. Trolley Frame

   • Welded steel structure housing all components

6. Wheel Assemblies

   • Forged steel wheels for rail travel

7. Limit Switches

   • For upper/lower hoist and trolley travel limits

8. Load Block & Hook

   • Forged hook with safety latch

Advantages of Double Girder Trolley

• Higher lifting height (since hoist sits on top of girders, not below)

• Greater load capacity

• Robust and durable design

• Customizable for specific spans, environments, and loads

• Ideal for long-span or high-lift applications

Safety & Standards

• Must comply with:

  • FEM / DIN / CMAA / ISO standards

• Optional safety features:

  • Overload protection

  • Anti-collision devices

  • Sway control systems

  • Explosion-proof designs (for hazardous environments)