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Spreader Bar Cable Application: What is a spreader bar? Container crane context: Gantry crane positioned at dock Overhead hoist mechanism: Winch + trolley system Spreader bar: Attachment point below hoist Function: Grips container corners, distributes load, tilts container for placement Spreader bar structure: Framework: Steel tubes/beams forming rectangular frame Lifting points: 4 corner attachment rings (one per container corner) Electrical system: Motor-driven locks, position sensors, lighting Cables: Power supply for motors + control signals for locking mechanism Cable location (spreader bar): Vertical run (primary): From crane hoist (top) down 20–40 m to spreader bar (bottom) Function: Supply power for: - Corner lock solenoids (release container locks) - Position feedback sensors (confirm locks engaged) - Optional: Spreader bar lighting (visibility during operation) Simultaneous function: Act as partial mechanical support (share load with main hoist cable) Horizontal distribution (on spreader bar): From entry point distributed across spreader frame Supply all four corner lock motors Branching: May split into smaller branches (4× circuits to corners) Mechanical load: Cable must withstand: Static tension: Weight of container payload (20–40 tons distributed) Dynamic loads: Jerking during load acceleration, swinging in wind Thermal: Tropical port environment, direct sun, saltwater spray Abrasion: Rubbing against spreader frame during operation Cable design philosophy: Dual function (unique): Electrical function: Deliver 300/500V power for locking system Mechanical function: Share load-bearing (not primary structure, but support role) Different from: Pure electrical cables (festoon, lifting): Electrical function only Pure mechanical ropes: Mechanical function only BASKET SPREADER 730: Both functions integrated Speed specification rationale: 160 m/min (relatively slow): Container crane cycle time: ~45–60 seconds per lift Descent distance: 20–40 m Descent speed: 20–40 m ÷ 45–60 sec = 0.33–0.9 m/s = 20–54 m/min Average speed: ~30 m/min (loading) + 20 m/min (discharge) = 25 m/min 160 m/min specification: 6–8× safety margin on speed Design: Allows for fast emergency ascent if needed Why not higher speed? Mechanical load constraint: Heavy cable (4000 N = ~400 kg equivalent) Inertia: Accelerating 400 kg + spreader bar + container inertia takes time Structural: Crane frame limits acceleration rates (safety interlocks) Result: 160 m/min is practical maximum for loaded spreader bar
Technical Department
on18/06/2026

什么是 RS-(N)TSCGEWOEU-TUNNELFLEX-TX from 3,6/6 to 12/20kV：无抗扭保护中压隧道移动设备电缆技术解析

RS-(N)TSCGEWOEU-TUNNELFLEX-TX 是一种面向隧道移动设备供电的中压柔性动力电缆，覆盖 3,6/6kV、6/10kV、8,7/15kV 和 12/20kV 电压等级。它的核心应用场景是高机械损伤风险环境下的移动设备供电：设备移动、卷筒收放、拖曳摩擦、冲击挤压、泥水污染、低温运行和多层卷绕散热同时存在。资料中特别注明 WITHOUT ANTITWISTING PROTECTION，这意味着工程选型时必须清楚地区分“高柔性卷筒/移动供电能力”和“抗扭保护能力”之间的边界。