Tubular Stranding Machine 630/1+6 For High Tensile Prestressed PC Steel Wire

Product Overview
Tubular strander · Model TG-630/1+6 · For 1×7 prestressed concrete steel strand and 1+6 wire rope

The Tubular Stranding Machine 630/1+6 is a high-speed, torsion-free stranding system designed for manufacturers of prestressed concrete (PC) steel strand per ASTM A416 / A779, EN 10138, GB/T 5224 and ISO 6934-3. It lays six outer wires (wound on 630 mm bobbins carried inside the rotating tube) around a stationary central wire, producing the standard 1×7 strand structure used in post-tensioned and pre-tensioned concrete construction.

Because the pay-off reels rotate with the tube rather than counter-rotating, the machine imparts zero reverse twist to the individual wires. The result is a strand with uniform lay pitch, consistent diameter, low relaxation and excellent bond performance with concrete — the three properties that determine whether a strand passes tensile and stress-relaxation testing.

Key Features
Six design decisions that decide strand quality at 1000+ rpm

True Tubular, Torsion-Free Kinematics
Six 630 mm bobbins housed inside a dynamically balanced steel tube. Wires pay off without reversing, so no residual twist, no "spring" in the finished strand, no wire damage.

Hardened & Ground Gearing
Change-gear set for lay pitch selection, plus stepless variant on request. Pitch accuracy ≤ ±1%, repeatable reel-to-reel and batch-to-batch.

Individual Wire Tensioning
Magnetic-powder or servo-controlled pay-off tension, 5–60 N per wire, drift ≤ ±5% over 8 h. Eliminates loose outer wires and diameter fluctuation.

Full-Length Safety Tube
Rotating tube enclosed by a stationary steel guard with interlocking access doors, zero-speed door release and dual-channel emergency stop (ISO 13849-1, Cat. 3).

High-Speed Capability
Cage speed up to 1200 rpm (product and balance-dependent). Double-bearing support, ISO 21940 G6.3 dynamic balancing, vibration ≤ 2.8 mm/s at full speed.

PLC + HMI Control
Real-time rpm, lay pitch, line speed, metre count, tension and alarm display. 50 product recipes, Ethernet/Modbus TCP, OPC-UA optional for MES linkage.

Applications

• Where 1×7 PC strand is specified — and where this machine is installed
• Prestressed concrete & civil engineering
• Post-tensioned bridge decks, beams and box girders
• Pre-tensioned railway sleepers, poles and concrete pipes
• Nuclear containment, LNG tanks, silos and industrial floors
• Stay cables for cable-stayed bridges and masts
• Ground anchors, rock bolts and slope stabilisation
• Wire rope & industrial strands
• 1+6 galvanised steel wire rope (crane, hoist, guy lines)
• Aircraft & stainless steel 1×7 strands
• Spring wire, brush wire and ACSR-type conductors
• Fencing, hanger and stay wire
• High-carbon steel, stainless and alloy wire (Φ1.5–5.0 mm)

Parameter  / Specification

• Machine type    Tubular stranding machine (torsion-free), model TG-630/1+6
• Stranding structure    1+6 (1×7 standard); 1+3 and 1+9 / 1+12 cages on request
• Bobbin size    PN630 (630 × 355 × 80 mm per IEC 60264)
• Bobbin load capacity    ≤ 600 kg per reel
• Wire diameter (single)    Φ1.5 – 5.0 mm (high-carbon, galvanised or stainless steel)
• Finished strand diameter    Φ9.53 / 12.70 / 15.24 mm (3/8", 1/2", 0.6" PC strand); up to Φ18 mm on request
• Cage speed    0 – 1200 rpm, AC vector drive with regenerative braking
• Lay pitch    50 – 350 mm, set by change gears (stepless option)
• Max. stranding speed    35 – 120 m/min (dependent on strand diameter and pitch)
• Pay-off tension    5 – 60 N per wire, ±5% stability
• Pitch tolerance    ≤ ±1%
• Capstan    Dual-roller or wheel type, rubber-lined, servo-synchronised
• Take-up    PN1250 / PN1600 portal or double-disc, programmable traverse, auto slow-down
• Installed power    approx. 45 kW (cage 30 kW + capstan 11 kW + auxiliaries)
• Noise level    ≤ 85 dB(A) at 1 m (enclosed)
• Dimensions (L×W×H)    approx. 22.0 × 3.6 × 2.2 m (single tube section)
• Standards    EN 60204-1, EN ISO 12100, ISO 13849-1 Cat. 3, CE declaration

• Factory Acceptance Test (FAT)
• No-load run ≥ 2 h at 1200 rpm, vibration ≤ 2.8 mm/s
• Lay pitch accuracy ≤ ±1% over 100 m
• Tension stability ≤ ±5% over 8 h
• Strand diameter within ±0.15 mm, no ovality > 3%
• Safety circuit test per ISO 13849-1, Cat. 3
• Documentation & support
• GA drawing, P&ID, electrical schematic, terminal list
• Operation & maintenance manual (EN / CN / RU / ES)
• Parts list with OEM codes, tooling list, CE declaration
• On-site installation, commissioning and operator training
• 12 months warranty, 72 h spare-part dispatch from stock
• Remote diagnostics via VPN / TeamViewer