Double-twist stranding machines, high-performance twisting machines

Double Twist Stranding Machineare effective, compact production units primarily for use in the manufacture of highly flexible braids, bundled braids, for stranding pairs of wires, triples, quadruple designs …

The machine concept differs from the single-twist system in that one rotor turn generates two cable twists / turn. The braid is given the first twist at the stranding point of the system feed. At this point, the stranding material still has twice the length of lay of the desired final geometry. The final braid length of lay with the second stranding twist is only completed at the second turning point, before being introduced back into the static coil former.

BOW DOUBLE TWIST STRANDING MACHINE

Application for:

Multistrand 7 or 19 copper wire, aluminum wire, tinned copper conduct etc. Also multistrand insulated conduct for power cable, data cable, control cable etc. Laying up of 2/3/4 cores of small size building wires.

Bow Double Twist Stranding Machine Description:

Payoff

Double twist stranding machine

PLC control system with color touch screen

Advanced function (Optional):

1:Motorized payoff or back-twist payoff, tension keep stable from start to end.

2:Bow material : carbon fibre

3:Brake: serve motor

4:Motorized driven capstan. Lay length set on touch screen, no need to change gear mechanically.

5:Auto lubrication system: regularly lubricate important parts to prolong machine service life.

COMPUTER SIMULATION OF AN INDUSTRIAL WIRE DRAWING PROCESS

Wire Stranding Machine is an important industrial process. Wires are reduced in diameter through a series of die/capstan combinations which provide the desired reduction steps. Typical wire drawing machines within BICC Cables Ltd use up to twenty-one dies in one line and it is necessary to optimise the die drafting for each machine and final wire diameter to obtain good machine efficiency and high quality product. An important aspect in the manufacturing process is to avoid wire breakages with the resultant loss of production due to short final lengths and the associated time required to restring the drawing machine. In order to optimise the conditions for each machine and wire size, computer simulations of the process are used to predict performance by estimating factors such as the ratio of drawing stress to ultimate tensile stress, drawing force, back tension and heat generated.

A computer simulation of the multi-line wire drawing process for copper wire has been modelled by the Wrexham Technology Centre of BICC Cables Ltd using a bulk model. The redundant work during the drawing process was included by formulation and equations for the redundant deformation were derived that were in good agreement with published experimental work.

A new computer simulation has been developed to predict the performance of wire drawing process. The model uses a one dimensional explicit finite difference method to determine the plastic deformation in the dies. The redundant work formulation was used as in the previous simulation. This paper describes the numerical methods used and compared the results from the new computer simulation with the previous bulk model. Significant differences are predicted in the stress ratios, drawing force and heat generated for process predictions. The new simulation of the plastic deformation in the dies also indicated optimum semi-die angles away from the traditional eight degrees.

7 Wire Tubular Type Stranding Machine

Owing to the vast industry experience and in depth knowledge of this domain, we are offering a huge collection of high quality 7 Wire Tubular Type Stranding Machine. These products are manufactured using optimum quality raw material. These products are easy to install and requires low maintenance. Customers can avail these products from us at market-leading prices

Basket Type Stranding Machine

Basket Type Stranding Machine is mainly used to strand not only copper/aluminum conductor for the electric wire and cable but also the cable core, steel core, and steel rope. Machine’s make-up: pay-off, driving part, cylindrical part, hydraulic brake device, wire –bobbin frame, die-holder, haul-off device, spindle-type take-up/traversing (Φ50 bar traversing) and an electrical control part, etc.

Rigid Stranding Machine

The Rigid Stranding Machine is used for stranding CU, Al wires, and conductors. Stranding unilay and reverse concentric, round, compressed, compacted or sector-shaped ( straight or spiraled) as per customer requirements.

Main features:

Self-supporting rigid rotor design with 1 6 12 18 24 30 36 Bobbin Cage

High efficiency and speed

Bobbins mounted on pintles

A line drive by A.C. or D.C. motors with electronic or mechanical synchronization between line components.

Different braking device for bobbins

Centralized lubricating system for bearing

Disk type Pneumatic brake for Cage.

Machines with or without back twist

MMI /PLC Equipped, optional

Easy Lay Setting

High Speed Tubular Stranding Machine

High Speed Tubular Stranding Machine with back twist, for 1+6 Bobbin copper / aluminum round & compact conductors and steel wire stranding. This strander is for manufacturing high carbon & low carbon steel wire rope, copper & aluminum conductor

Bow Type Stranding Machine

The Bow Type Stranding Machine is suitable for a wide range of productions, obtained with high speed and productivity; the back twist process gives high quality products. The Bow stranders use components made with most modern materials, like carbon fiber for the bows, tungstene carbide for bushes, hardened steel for rollers.The control of tension of the cores is assured with electro-mechanical or pneumatic self compensated brake, with set up by control panel.The safe use is assured with control of bearing temperatures and supports vibration.The machine is protected with a soundproof cover, with pneumatic open, inside fans and lights.Is possible the bobbins side loading with a motorized trolley, that avoids the use of bridge cranes and reduces dramatically the total loading time of the line.

For Cables Industry:

Stranding of conductors made with copper, aluminium, aluminium alloy, aluminium steel reinforced or supported;

Laying up of 2 – 7 round insulated cores for low and medium voltage;

Laying up of 2 – 7 straight sector shaped insulated cores, with the rotating cradles version;

Possible application of fillers and tapes of every type.

Tubular stranding Machine

The Tubular Stranding machine consists of bearing stands made of welded steel for the tube bearings. Up to reel size of 630mm .The stranding rotor is built up from welded tubes with wire guidings outside the tube. The reels are held in cradles, which are positioned inside the tube. A light beam along the complete length of the machine monitors, if the pneumatically (optional)operated reel-pintles are securely closed and the cradles are in safe condition. The machine is equipped with wire break detectors for each segment, pneumatic disk-breaks and individual drives for the Stranding Rotor, the Capstan and the Take-Up. The operator’s desk gives full control over parameters like Rotor-speed, lay-length and production length.

Main Features:

• Machine placed on a Rigide steel frame with rotor support, fixed on the floor for an easy installation

• Tube rotating on encircling bearings or rollers

• Machine able to work in torsion or total back twist with the possibility of partial back twist

• Wire back tension kept constant from full to empty spool payoff

• Wire/strand break detector for each payoff unit(optional)

• Spool loading/unloading by crane

• Pneumatic pintles equipped with safety locking system

• Independent driving motors for tube, capstans and takeup units

• A.C. motors with flux vector control inverter