Comprehensive Technical Parameter Report of 20-ton Single-Girder Gantry Crane

I. Basic Parameters

1. Rated Lifting Capacity: 20 tons (main hook), some models are equipped with auxiliary hooks (e.g., 5-ton auxiliary hook).
2. Working Class: A3-A6, commonly A3 (medium-busy work).
3. Span: Customizable, standard range is 10-35 meters, common specifications are 17 meters, 18 meters, and 20 meters.
4. Lifting Height: Standard 6-12 meters, special requirements can be customized up to 30 meters.

II. Operating Performance

1. Lifting Speed:
   • Main Hook: 8-9.8 m/min (electric hoist driven).
   • Auxiliary Hook (if present): Speed ​​slightly higher than main hook.
2. Trolley Travel Speed: 30-36 m/min (rail model P38/QU80).
3. Trolley Travel Speed: 15-32 m/min.

III. Structural Design

1. Main Beam Type:
   • Single main beam design (L-type or MH-type), mostly made of Q345B high-strength steel, lightweight, low wheel pressure. Box-type structure (MH type), with good overall rigidity.
2. Rail requirements:
   • Rail height difference ≤ 12 meters, levelness must be guaranteed.
   • Main trolley rail model P38 or QU80.

IV. Electrical and Control

1. Power supply: Three-phase four-wire 380V/50Hz, power supply method is sliding contact line or cable reel.
2. Operation method: Mainly ground control (ground operation), optional driver’s cab operation or wireless remote control.
3. Safety devices: Limit switches, heavy load protection, emergency braking system.

V. Environmental adaptability

1. Operating temperature: -20℃ to +40℃, suitable for open freight yards, railway lines, etc.
2. Wind protection measures: Some models require rail clamps or anchoring devices (for outdoor use).

VI. Customization options

1. Span and lifting height: Adjusted according to user needs, factory dimensions or operating scenario data are required.
2. Additional functions:
   • Dual-purpose design of electromagnetic chuck or hook.
   • Extended boom (for special working conditions).

VII. Compliance Standards

The design shall comply with the following specifications:

• * Crane Design Code* (GB3811-2008).
• *Safety Regulations for Lifting Machinery* (GB6067-2009).
• Special Equipment Manufacturing Permit (certification required for lifting capacity ≥ 3 tons).

Summary

The technical parameters of a 20-ton single-girder gantry crane need to be customized according to the actual application scenario (e.g., freight yard, railway, factory), with a focus on span, lifting height, working class, and operation method. It is recommended to further confirm details (e.g., windproof and corrosion-resistant design) with the manufacturer based on specific needs.