Main technical parameters of 50-ton double-girder gantry crane

I. Core Parameters

1. Rated Lifting Capacity
   • Main Hook: 50 tons (standard operating conditions). Some models are equipped with an auxiliary hook (e.g., a 20-ton auxiliary hook) for dual-hook coordinated operation.
   • The design complies with the national standard GB/T14406-1993, and the structural strength is optimized for a 50-ton load.
2. Span and Boom
   • Span Range: Customizable from 5 to 35 meters, with common spans of 21.5 meters and 28 meters. The outrigger position is adjustable (e.g., 12 meters, 18 meters, and 28 meters).
   • Boom Length: The effective boom is typically 5 meters, meeting the lateral movement requirements of ballast buckets or large components.
3. Lifting Height
   • Standard height: 6 to 30 meters (above ground level), with special designs reaching 40 meters (including 30-meter-deep pits).
   • The maximum hook position is determined by the main beam structure and wire rope length, making it suitable for applications such as ports and underground projects.
4. Working Class
   • Generally A5 or A6 (medium-to-high intensity), suitable for frequent lifting or heavy-load operations.

II. Structural Design

1. Main Beam and Outriggers
   • Double-beam box-type structure: Made of Q345 high-strength steel, the honeycomb beam design reduces deadweight and enhances wind resistance.
   • Outrigger Type: A combination of rigid and flexible outriggers ensures gantry stability; the outriggers are removable for easy transportation and site adjustments.
2. Operating Mechanism
   • Trolley Drive: Separately driven, with a track center distance of 21.5 meters (example), ensuring smooth operation.
   • Trolley Mechanism: Variable frequency control, with a lifting speed of 1.2 to 12 m/min (main hook), high precision, and anti-sway.

III. Performance and Configuration

1. Electrical System
   • Operation Mode: Available with cab or wireless remote control, supporting variable frequency speed regulation and overload protection.
   • Conduction Type: Powered by cable or busbar, suitable for outdoor and humid environments.
2. Environmental Adaptability
   • Operating Temperature: -20°C to +40°C. Metal components are designed for a maximum stress of 150.8 MPa, ensuring low-temperature toughness.
   • Wind Resistance: The honeycomb beam structure reduces wind resistance, making it suitable for open-air sites.

IV. Customization Options

• Span Adjustment: Variable span designs are available (e.g., continuously adjustable from 21 to 27 meters). Outrigger interfaces are pre-set for easy modification.
• Expandable Functionality: Specialized lifting equipment such as grabs and electromagnetic chucks can be added.

V. Reference Standards and Certification

• Manufacturing Standard: GB/T14406-1993 “General Gantry Crane.”
• A special equipment manufacturing license is required. Main beam deflection is strictly controlled (mid-span accuracy affects safety).