FR2467909A2 - METHOD AND INSTALLATION FOR CONTINUOUS WIRING OF TORONFORM PRODUCTS OF LARGE CROSS SECTION - Google Patents

Abstract

at. Installation according to the main patent, in which the bundle of conductors 50 is stretched and stored over a short distance l between a first wiring connection 53 and a second wiring point 58 by means of holding and displacement 55, 56. b. Characterized in that the distance between the end of the retainer 56 and the second wiring point being an integer multiple of the storage length l, the cable passing through a wrapping installation 57 before the second wiring point, and the harness to cable being provided with a winding tape for retaining the wires before wiring. vs. Process applicable to the cabling of strands of conductors with a large cross section and / or flexible strands made up of braided wires.

Description

The main patent relates to a method and an installation for realizing

  continuous wiring, with alternating winding direction, solid electrical cables or conductors or strands formed of individual conductors and of very large cross-section.

  In this process, the strands are unrolled individually.

  plurality of supply coils arranged at a fixed station, are brought and bundled into a first wiring point and then, during the course of a predetermined distance which is limited by a second wiring point,

  wired in tense states within this predetermined path.

  Inside this path, along a shorter defined path, the product is kept in a tight state, and the beam, after leaving the first wiring point, is forcibly surrounded on all sides and maintained, while the portion

  between the first point of wiring and that point of

  the cable portion is then wired and free of rotation during the course of this holding section, before being brought after release of

  their maintenance of the wired strands at the second point of wiring.

  "Wiring point" here means the transition point between a stationary system, for example a strand reserve placed at a fixed station and a rotary system, constituted here by the wiring device, or conversely the transition between a system. rotary device (wiring device) and a stationary system, for example a unwinding device or a drum

  winding arranged in a fixed position.

  In this way, it is possible to use, even for elements with a very large cross section and thus with extremely high resistance torque, the so-called SZ wiring, which has been used for a long time in the manufacture of telecommunications cables, as well as in the technical field. of

strong current conductors.

  The disadvantage, however, is that cable cores manufactured according to the main patent sometimes have a ripple of the strand bundle, which does not, in fact, affect the reliability of the cable and its safety. but which is frequently the cause of a

  unsightly exterior appearance of the cable.

  The object of the invention is to improve the process of

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  main patent, allowing to manufacture without difficulty

  cables from strands of very large cross-section

  dirty, without having to give up economic wiring type SZ.

  For this purpose, the method of the present invention is characterized in that the distance between the ends of the holding device and the second wiring point is an integer multiple of the storage length and amounts to at least

twice that length.

  The invention is based on the knowledge that a cable bundle in the SZ manner from strands of very large section

  cross-section receives, through the wiring process, with the

  positive cable storage, a corrugation towards its longitudinal axis when, at the exit of the storage device, a fixed wiring point is placed too much

short distance.

  The operating principle of a cabling machine with storage of a length of cable with periodic reversal of the direction of rotation of the storage, comprises a double twist of the strands, the first when entering the wiring storage and the second when leaving the storage. While the first twist is possible without side effects, the second twist, which takes place on an already wired beam, shows that the strand wiring that is needed for shortening the lengths of each wiring does occur

  more in the case of strands with a large cross-section only

  inside the cable bundle, but also on the bundle itself. This second twist consequently produces a ripple on the beam. Regardless of its external appearance, this undulation can make it difficult to insert the

  cable in channels. It can also sometimes make it neces-

  for example, straightening the cable and influencing the

  its winding on drums or coils.

  If however, the second twist occurs on a length t with the complete sequence of steps S and Z, this length

  -ô corresponding to twice the storage length, the defor-

  resultant torsion on this length is mathematically

  only that, for example, the portion that has been wired to S disappears again in the wired portion.

  Z. Undesirable corrugation of the beam with the length considered

  then it is reduced to a minimum. If we then increase

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  the length Qt targeted in S and Z, according to the invention, a multiple of this length, the ripple on the beam

becomes null.

  In the application of the invention, he consequently

  It has been found particularly advantageous to provide that the wired harness, after leaving the holding device, passes through an envelope device before reaching the second wiring point. During the crossing of this envelope, we apply judiciously on

  the bundle cabled, by extrusion, at least the inner envelope

  which produces the round shape of the beam. Of course, it is also possible, along this route, to perform

  other additional work operations. It was notably

  found advantageous to provide the cabled bundle, before the extrusion of the inner casing, of a band

  wound of usual shape for its maintenance. But he is also

  a characteristic marking of the cable by the measurements in accordance with the invention, before the bundle

  cable reached the second wiring point.

  For the application of the method according to the present invention, it is possible to adopt the cable installation provided in the main patent comprising one or more jaws or clamps arranged along the storage path, surrounding the bundle of strands, and accompanying the product in its displacement in the axial direction. During this course, these elements revolve around the longitudinal axis. In this case, the first and the last jaw or chuck, perform the wiring between them and the wiring point, and continuously provide this wiring function on the next section, then again on the next, while the jaws or tongs that were first of all first and then

  second, etc., ensure a continuous maintenance of the

  bucket, for torsion-free guiding through the path

storage.

  According to another characteristic of the invention, however, it has proved advantageous to provide that the maintenance and wiring of the beam, formed of strands of very large cross section, are provided by means of two sets of clamps or clamping jaws arranged following each other in the direction of walking, turning in the same direction

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  and at the same speed. According to the invention, these clamps or clamping jaws are fixed on chains and form together with them, on each side of the beam a caterpillar with links. In each pair of clamps or jaws, one of the clamps or jaws is provided on the rotational circle with one axis, and the other which is associated therewith is provided with a recess corresponding to the size of the This measurement ensures a synchronism of operation between the carriages in which the clamps or jaws are arranged; in such a way that the beam is gripped simultaneously on all sides and can be guided without

  risk of false twist during wiring.

  However, in the case where the elements to be wired

  consist of strands of very large cross-section

  dirty but composed of individual sons, that is to say

  which are themselves "flexible", or elements which, because of a particular structure, have a very low rigidity compared to solid conductors, it is possible to overcome, in the realization of wiring steps, certain difficulties due to the fact that the cabled elements do not fit

  always in the divided position in the cable structure.

  To obviate this difficulty, and according to another characteristic of the invention, it is provided that the conductors or strands which are grouped into a beam in a first wiring point are continuously surrounded with one or

  several holding windings. The application of these coils

  (n) and torsion occur simultaneously.

  ment, so that the holding winding is wound on a

  Twisted bundle of conductors which is thus fixed.

  The wrapping band around wired strands is known per se and is then made after wiring the individual elements to hold them together. By cons, with this feature of the method of the invention according to the main patent, it is to fix and immobilize the structure of a beam during the twisting conductors

  individually by means of a holding winding band.

  For this entourage of the beam with a holding winding, it is possible to implement different materials

  usual insulators in the technique of cable construction.

  The winding may be in the form of a flat strip or any other profile, but preferably of small thickness. In the case of particularly severe conditions relating to tensile strength, it is possible to

  suitable materials, for example poly-tetra-

  fluorethylene, polyamide or the like. A particularly suitable choice in this respect consists of an interlaced or woven web, for example a mesh fabric made of these materials, then cut into strips that are wrapped around the bundled bundle

of drivers.

  For the application of this method, according to the invention, provision is made between a first wiring point

  and the traction device which carries out the wiring, a winding

  their rearward shape is flat and of short construction length, which makes it possible to maintain a minimum distance between the first point of wiring (wiring connection) and the

  rotary traction device which carries out the wiring.

  The wiring or twisting of the individual elements may, as described in the main patent, be carried out at

  means of traction devices with rotary clamps. Special Package

  For strands of flexible conductors, it can be

  It is advantageous to adapt a rotary belt or tape

  articulated lions, such as that described above.

  It is furthermore advantageous, particularly from the point of view of making a compact mechanical installation, to have in the same single casing the device for raising the unwound conductors of fixed position coils, the wiring connection forming the first point of wiring. as well as the winding winding or holding tape. It is also advisable to mount the dressing device so that it can slide longitudinally on the wiring connection, which has a decisive positive effect on the wiring process inside the fitting. We thus obtain a

  optimum adaptation of the entry angle of the indi-

vidual.

  The invention is explained below with the help of examples

  embodiments with reference to the figures of the accompanying drawings in which:

  - Figure 1 is a diagram of the whole of the

  wiring installation according to the method of the invention.

  FIG. 2 is a view on a larger scale and

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  detailed cable traction devices.

  - Figure 3 shows an installation for wiring conductors of large cross section, for example, the strands of a low voltage splitter cable, with operating voltage of the order of 1 kilovolt. The strands 50, for example in the form of sectors of a power transmission cable, which must be wired are extracted from reserve magazines arranged in a fixed position. By means of guide rollers 52, which serve at the same time to train the insulated strands 50 (roller dressers), they are fed to the wiring connector 53, in which strands are united in a bundle and they are brought to

  cabling device 54 mounted later in the direction of advance-

  products. This wiring device 54 consists essentially of a set of traction clamps, or, as shown in FIG. 1, by two sets of

successive clamps 55 and 56.

  Figure 2 shows in detail these traction devices and driving the bundle of strands. The grippers or jaws of these traction devices surround and grip, as shown in FIG. 2, the grouped bundle of strands, and they are rotated simultaneously in an inverted direction of rotation at certain time intervals, so that the beam length between the connector 53 and the first set of jaws or jaws 55 of the traction device is wired. During the continuous rotation process, of the SZ type, the following grippers or jaws of the pulling device 55 seize the cabled beam one after the other, and finally the set of grippers 56 transmits it free of false twist across the path. storage formed by both

traction devices.

  In order to ensure that the products thus obtained can then be processed without any inconvenience and in particular do not undergo any undulation during the wiring operation, it is provided, in accordance with the present invention, following the set of traction clamps. 56, a device in the form of envelope 57. The latter can be constituted for example by a device providing a winding of tape on the cable,

  and an extruder to apply on it the envelope of

  inside envelope and a cooling channel

  ment. This casing assembly 57 is followed by a last traction device 58, for example in the form of a traction track mounted at a stationary position. This device constitutes at the same time the second wiring point of the installation. By an appropriate choice of the distance equal to at least 2 n. lsp (where n is an integer and the length of the storage sp), the waviness of the wired bundle 59 tends to zero, even in the case of these very large cross sections of conductors. The product provided with an inner envelope is then guided on the pulley 60 to be wound on the drum 61. Of course, it is possible to connect to the crawler traction device final 58, other work processes unwinding continuous, for example the installation of a shield and, directly afterwards, the extrusion of an envelope

  mechanically resistant exterior.

  FIG. 2 shows a jaw or jaw traction device on an enlarged scale with respect to FIG. 1. This device essentially consists of several gripper carrying carriages 62 which are fastened to the chains 64 by means of FIG. struts 63 driven by two motors 66, to move the bundle of conductors to be wired 67. In order to ensure, in the application of the invention, a synchtonism between the clamp carriages 62 of the two chains 64, essential for safety of operation of the device, there is provided a coupling by form engagement between the two pairs of chains. This coupling is effected by means of an elastic axis 68, for example made of hard polyethylene, provided on each carriage of one of the pairs of chains which is on the revolution circuit 69 of the two pairs of pincushions, and which engages, during rotation, in a recess

  70, each of the carriages of the other pair of chains.

  Since the clip carriages are attached to the catkins by means of fishplates 63, it is necessary that the form engagement coupling between the chains be on the outer radial extension of the transverse center axis of the fishplates 71. elastic axis 68 and the recess 70 are in principle constituent elements of the chain mechanism

  and form a kind of drive teeth.

  The synchronous movement of the chains obtained by this coupling replaces, in its simplicity, a mechanism that would be mounted laterally, and thus allows an identical lateral structure of all the carriages on the gripper traction device. In addition, it allows a parallel connection of the rotors of the two drive motors 66 and the realization

  a relatively simple electronic control of these engines.

  The invention thus achieves, with an installation expense

  mechanics and electronics as small as possible, the syn-

  chronism of circulation of the two chain mechanisms of a

  gripper pulling device for the bundle to be wired.

  Figure 3 is a diagram of an installation con-

  form to the other feature of the invention, for example for the wiring of low voltage splitter cables. The strands consist for example of individual wires wired together to form multi-wire sector conductors, which thus form "flexible" wiring elements in the usual sense of the term. These strands 50 are extracted in number provided for the finished product from reserve coils, not shown,

  and are fed to a wiring connector 53 through a device

  Dressing roller 52, and another device 3 said pre-wiring. The usual core inserts with such cables, as well as the drive clamping devices can also be fed with the strands to the connection of

wiring 53.

  Directly after the wiring connection 53, that is

  that is, while the process of wiring the individual strands

  duels still in progress, the beam is surrounded

  two holding windings 6 by means of the rear winder 5 of flat construction. Then, the bundled cable formed of the wired strands, provided with the winding, is introduced into the tweezers 55 rotating in an alternating direction of rotation (S Z). During the journey between the wiring connector 53 and the first device of

  pulling clamps 55, the wire harness is twisted.

  After abandoning the rotary gripper pulling device 55, the wire bundle composed of the strands 50 passes through a wrapping installation 8 in which it receives, for example, an inner sheath and an outer sheath. The wired harness is then twisted by the pliers 55 to a

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  the traction track 58 of the wrapping course, which avoids a second twisting, which would give rise to a waviness of the piece of cable. After the traction caterpillar 58, the cabled and wrapped beam, now constituting the cable 11, is wound on the drum 61.

Claims (4)

A method for continuous wiring with alternating pitch direction reversal, according to the main patent, of cables and electrical conduits made of strands of very large cross-section, which are solid or composed of individual wires, in which process the strands are individually extracted from reserves arranged at a fixed station, are bundled in a first wiring point (53), and then are wired in the stretched state during the course of a determined distance limited by a second wiring point (58) the beam being stored in a stretched state for a defined short distance (tQ, after leaving the first wiring point, and being on a length which is only a fraction of the length stored, clamped and held on all sides, the beam being wired during the maintenance of the beam section between the first wiring point and the holding members (55, 56), and this portion wired wire being further maintained, while traversing the storage length, in its wired condition without the possibility of stripping, before, after the wired strands are released from the holding device, these are brought to the second cabling point characterized in that the distance between the end of the holder (56) and the second wiring point (58> is an integer multiple of the storage length (t), i.e. at least equal to double of it.   20) A method according to claim 1, characterized in that the cabled bundle, after leaving the holding device passes through a wrapping installation (57) before   to reach the second cabling point.   Process according to Claim 2, characterized   in that, during the crossing of the envelope installation   extruded, on the cable bundle, at least the envelope   interior giving the cable its round shape.   4) Method according to one of claims 2 and   3, characterized in that the cabled bundle is provided for the maintenance of the group of conductors constituting a winding   of tape before extrusion of the inner envelope.    A method according to claim 1, characterized in that the strands which are bundled in a bundle in the first wiring point are, directly after leaving the wiring point as a bundle, surrounded in common with a wiring harness 2467909   or several holding windings.   Process according to Claim 5, characterized in that the holding windings are constituted by profile strips.   70) A method according to claim 5, characterized in that the holding windings are constituted by webs of fabric, including mesh fabric of insulating material with high mechanical resistance.   8) Installation for the application of the method according to claim 1, characterized in that the holding and the wiring are carried out by means of traction devices rotary tongs or jaws.   ) Installation according to claim 8, characterized in that the maintenance and the wiring are carried out by means of two traction devices with clamps or jaws arranged one behind the other in the direction of the crossing,   turning in the same direction and with the same speed.    ) Installation according to claim 9, characterized in that the diaricts carrying clamps or clamping jaws are fixed on chains and together with them form a chain or caterpillar links on each side of the beam, and on each pair of carriages with tongs or jaws, one of the carriages of this chain is provided with an axis intended to cooperate, during the march, with a recess of the same   dimension provided on each of the carriages of the other chain.   ) Installation for the application of the method according to claim 5, characterized in that, between the first point of wiring and a traction device ensuring the wiring, is arranged a rear band winder, of   flattened and compact construction of short length.   ) Installation according to any one of the   1 to 11, characterized in that a conductor forming device, the cable entry fitting and the holding tape reel, are mounted in a housing. unique.   Installation according to Claim 12, characterized in that the conductor-forming device is mounted in the housing so that it can slide longitudinally on the connection wiring.