Comprehensive technical parameters of QZ grab bridge crane

I. Main Technical Parameters

1. Rated Lifting Capacity
   • Standard Range: 5-50 tons (common models are 5t, 10t, 16t, and 20t, etc.), including the grab bucket’s deadweight.
   • Capacity can be expanded to 100 tons for special needs, but mainstream models are concentrated in the 5-50 ton range.
2. Span
   • Standard span: 10.5-31.5 meters (e.g., 10.5m, 13.5m, 16.5m, etc.), with a maximum span of 50 meters.
   • Span selection should be based on the actual track layout. For example, QZ16t-18m indicates a rated capacity of 16 tons and a span of 18 meters.
3. Lifting Height
   • Conventional height: 6-30 meters, with 20 meters being the most common configuration.
   • Underwater or special operations require custom designs and may require waterproofing equipment.
   • Working Class: Typically A5 (light duty) or A6 (heavy duty), suitable for applications involving frequent handling of bulk materials (such as metallurgy and cement plants).

II. Operating Speed ​​and Motor Configuration

1. Speed ​​Parameters
   • Hoisting/Opening/Closing Speed: 37.4-45.7 m/min (e.g., 40.26 m/min for the QZ16t model).
   • Trolley Operating Speed: 43.2-45.9 m/min (wheel diameter φ350-φ400).
   • Trolley Operating Speed: 87.3-112.5 m/min (wheel diameter φ600).
2. Motor Model
   • Hoisting Motor: YZR Series (e.g., YZR280M-10/45kW, YZR315M-10/90kW).
   • Trolley Operating Motor: YZR132M-6 (3.7-5.5kW).
   • Trolley Operating Motor: YZR200L-8/15kW (dual motor drive).

III. Grab Bucket Configuration

1. Type and Capacity
   • The standard double-drum, four-rope grab features a simple and reliable structure and can be opened and closed at any height. Light-duty grabs (such as the U155): have a capacity of 10 m³ and are suitable for materials with densities ≤ 1 t/m³ (e.g., coal).
   • Medium-duty grabs (such as the U151/152): have a capacity of 6 m³ and are suitable for materials with densities between 1 and 1.7 t/m³ (e.g., iron ore).
   • Grabs with teeth are required for particles larger than 200 mm, and special designs are required for underwater operations.
2. Grab Weight
   • Grabs for 5-20 ton models weigh approximately 2-10 tons (e.g., a 16 ton model weighs approximately 9,812 kg).

IV. Structure and Other Parameters

• Girder and Deadweight
  • For a box-type bridge design, the geometric characteristics of the main beam cross-section must be considered for load calculation (e.g., the QZ16t main beam cross-section area is 258 cm²).
  • Ground Weight: Approximately 12 to 33 tons for 5-50 ton models (e.g., the QZ16t weighs 33,100 kg).
• Power Supply and Environmental Compatibility
  • Power supply: Three-phase AC 380V/50Hz.
  • A rain cover is required for outdoor use. Customized protection is required for special environments (e.g., corrosive environments).

V. Applicable Industries and Selection Recommendations

• Typical Applications: Bulk material handling (e.g., ore, coal sand, coke) in metallurgy, cement plants, chemical plants, docks, warehouses, etc.
• Selection Key Points:
  • Material density determines the grab type (light/medium).
  • Span and lifting height must match site conditions.

A6 duty class is preferred for frequent operations. The above parameters can be adjusted and customized according to actual needs. For example, special spans, speeds or grab configurations need to be designed in combination with specific working conditions.