Detailed Description
Heavy Duty vs Standard — What Makes It "Heavy"
| Standard Overhead Crane Cable | Heavy Duty Overhead Crane Cable | |
|---|---|---|
| Lift capacity | 1–50 tons | 50–500+ tons |
| Power cross-section | 4–50 mm² | 16–240 mm² |
| Tensile core | 10–20 kN | 20–60 kN |
| Core construction | Standard concentric | Reinforced high-density + PET fleece |
| Drum D/d | 10:1 | 12:1 minimum |
| Reeling cycles | >50 000 | >150 000 |
| Jacket thickness | 1.0–1.5 mm | 2.0–4.0 mm |
| Optional features | Control cores | Control + fiber optic + MV option |
The physical difference is visible: the Heavy Duty cable is approximately 20–40% larger in outside diameter for the same copper cross-section, because of the oversized tensile core, thicker jacket, and reinforced internal construction.
The Heavy Lift Duty Cycle
A 300-ton ladle crane in a steel mill performs 5–10 heavy lifts per hour — each lift moving a ladle of molten steel from the BOF to the continuous caster. The duty cycle is:
- Hoist up (90 seconds): Full load, cable under maximum tension — the steel core carries the combined ladle + cable weight
- Bridge travel (2–5 minutes): Moderate tension, long drum travel — cable winds and unwinds on the motorized drum
- Hoist down (60 seconds): Load tension decreases as the ladle descends — cable unspools, drum tension reverses
- Return (5–8 minutes): Empty ladle return — light load, faster travel, more reeling cycles
Why Choose Yichi Heavy Duty Overhead Crane Cable?
- Oversized tensile core: We calculate the steel wire diameter for your maximum lift weight + cable weight — not a catalog standard
- Reinforced core construction: PET fleece inter-layer separation + high-density stranding — prevents the internal cable damage that precedes visible jacket failure
- PUR or CR jacket: Match the jacket to your environment — CR for indoor steel mills (MSHA + flame), PUR for outdoor and specialty applications
- MV option: 3.6/6 kV with semiconductive screens for large crane motors — avoid running two separate cables
- Fiber optic integration: Crane CMS, load monitoring, and anti-sway control — in one cable with the power conductors