In modern cable manufacturing, achieving uniform lay length, consistent tension, and superior conductor quality is essential for overhead transmission lines, power cables, and specialty applications. The RLB Cage Type Stranding Machine (models 500 and 630) is a robust, high-performance solution designed for 100% back-twist stranding of steel core aluminum stranded wires (ACSR), aluminum clad steel, bare copper, bare aluminum, power optical cables, and multi-core control cables (up to 19/37 cores).
With flexible 6B to 24B configurations, automatic tension compensation, and optional filling devices, this cage strander delivers exceptional productivity, cable roundness, and long-term reliability in high-volume production environments.
Key Features & Operational Advantages
- 100% Back-Twist Movement: Eliminates internal stress in conductors, ensuring excellent flexibility, roundness, and electrical performance.
- Precision Constant Tension System: Magnetic hysteresis tension controllers with automatic bobbin diameter detection feed real-time data to the PLC, maintaining stable tension from full to empty bobbin.
- Advanced Drive & Control: DC main motor with ground shaft or individual AC servo motors per cage section; MMI+PLC system for pre-setting stranding pitch, direction, automatic tension control, and full synchronization with traction and take-up.
- Flexible Configurations: Supports up to 24 filling devices; compatible with loading-crane or loading-car for fast, safe bobbin handling.
- Heavy-Duty Capacity: Large payoff (PN500/PND500) and take-up reels (up to PN2500), with maximum stranded conductor OD up to Φ50 mm.
These features translate into higher output, lower scrap rates, and consistent high-quality stranded conductors compared to traditional planetary or tubular systems.
Technical Specifications
| Model |
Single Wire Diameter (mm) |
Max. Stranded Conductor OD (mm) |
Max. Rotating Speed (rpm) |
Max. Pulling Speed (m/min) |
Payoff Reel in Cage |
Center Payoff Reel |
Take-up Reel |
| 500 |
Copper: Φ1.5–3.0 Aluminum: Φ1.8–4.0 Insulated: Φ3.0–8.0 |
Φ45 |
6B: 100 12B: 100 18B: 70 24B: 62 |
51 |
PN500/PND500 |
PN800/PN1600 |
PN1600/PN2500 |
| 630 |
Copper: Φ1.5–5.0 Aluminum: Φ1.8–5.0 Insulated: Φ3.0–10.0 |
Φ50 |
6B: 70 12B: 70 18B: 62 24B: 50 |
42 |
PN500/PND500 |
PN800/PN1600 |
PN1600/PN2500 |
Stranding lay length is step-less and fully adjustable. Central height: 1000 mm.
Primary Applications
- Steel core aluminum stranded conductors (ACSR) and aluminum clad steel wires
- Bare copper and bare aluminum conductors for power cables
- Power optical cables and composite overhead ground wires (OPGW)
- 19/37-core control and instrumentation cables
- Steel wire armoring cables and specialty stranded products
The RLB cage type strander can be seamlessly integrated with online filling, taping, or armoring equipment to create complete multi-layer cable production lines.
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