FR2545972A1 - FLEXIBLE ELECTRICAL CABLE FOR TRANSMITTING SIGNALS ON MOVING BODIES, PROCESS FOR MANUFACTURING AND DEVICE FOR CARRYING OUT THE PROCESS - Google Patents

Abstract

THE INVENTION CONCERNS A FLEXIBLE ELECTRIC CABLE12 FOR THE TRANSMISSION OF SIGNALS ON MOVING BODIES, A PROCESS FOR ITS MANUFACTURING AND A DEVICE FOR CARRYING OUT THE PROCESS. THE CABLE12 OF THE INVENTION CONSISTS OF AT LEAST ONE, PREFERREDLY, OF TWO ELECTRICAL CONDUCTORS14 ESSENTIALLY PARALLETED AND INSULATED BY A VARNISH15, THESE CONDUCTORS14 BEING COATED A LITTLE NEAR THE CENTER AND OVER THE ENTIRE LENGTH OF A TRACTION UNIT DIFFERENT BEARING BEAMS16 CONSTITUTES OF MANY THIN INDIVIDUAL YARNS. THE CABLE12 OF THE INVENTION IS USED FOR GUIDING FLYING BODIES.

Description

Flexible electric cable for the transmission of si nals on g

He is moving process

  for its manufacture and device for the

process.

  The invention relates to a flexible electrical cable for transmitting signals over

  moving bodies, a process for its manufacture

  and a device for carrying out the method.

  Strands or flexible electrical cables for transmitting signals between a

  command post and a body moving fast-

  particularly, a flying body, are known.

  for example, according to the patent of the Federal Republic of Germany 17 65 133 In this case, two parallel copper wires insulated with a varnish are glued to each other and are passed through the center of the wire. polyester support of the traction member held by a covering made of natural silk, this support wire being assembled in at least three bundles of individual support wires,

  such conductors allow the transmission of

  on flying bodies that travel up to speeds of about 260 m /

range of about 4,000 meters.

  For reasons of motion kinematics

  The driver's reserve for the transmission of signals in the moving body must be driven in the form of one or more coils. The static and dynamic stresses of the driver during unwinding, in particular during the flight of the flying body, are important to litters and

  desired flight speeds and, independently of

  significantly different during the start-up and running phase, they must remain as reproducible and

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  course of flight time. For this purpose, the different windings

  coils with multiple layers of

  ments must, when they are carried out, that is,

  say when winding, be glued together so that in addition to a uniform gluing

  for each winding, there are forces of col-

  as identical as possible for each coil

  independently of the above-mentioned differences in

  the starting and walking phase of the flying body.

  Defects occurring in the manufacture of these coils have a direct influence on the unwinding properties of the coils during their use

  in flying bodies An irre-

  For example, the faulty one leads, for example, to a detachment of several layers simultaneously, which gives rise, during the unwinding during the flight, to what is known as the formation of hulls on the

  electrical conductors, however, according to the

  acquired, these hulls break during the

  next shock, so that the transmission of

  In addition, these bundles of loose layers are exposed to a particular extent to the mechanical and thermal stresses both during start-up and during so-called walking of these flying bodies which

  are usually operated by a jet of hot gas.

  As is known, during the start-up phase, such a flying body must be accelerated from the zero speed to its running speed and, therefore, the cable is exposed, on the one hand, to a very strong dynamic loading by the rapid increase of the speed of unwinding and, on the other hand, to solicitations

  thermal by the immediate vicinity of the gas jet.

  During the walking phase, the cable is

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  uncontrollably quoted by particles

  which stand out from an illuminated composition.

  constantly present and associated with the flying body When they affect the bundles of detached layers, these particles have a particular action.

  particularly destructive and completely independent

  because of their greater surface area, layer bundles may be more

  easily reached that an individual winding

pear-shaped tree.

  While manufacturing the drivers, the various manufacturing steps

  can be controlled by processes and

  In this way, it is difficult, if not impossible, for bobbins to wind the bobbins because, when the adhesion force actually present between them is checked, they can be reproducibly reproducible. different windings, these must be detached from the coil and therefore the latter

  destroyed, the manufacture of these bobbins

  can only be checked by sampling, so

  that one can only detect the tendency to defect

  In order to make a coil with

  Unwinding properties as uniform as possible, the person in charge of the winding machine must, therefore, have great skill Such a state of things not only goes against all modern methods of manufacture, but it is not

  nor is it cost-effective in terms of time.

  Another factor of insecurity lies in the fact that it is necessary to provide the natural silk fibers whose specific properties fluctuate strongly and, consequently, vary from one charge to another with regard to the impregnation power.

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and hence the adhesion force.

  Similarly, it is always more difficult to obtain natural silk Therefore, for a long time, it is desirable to replace the natural silk by other materials that can be manufactured with properties constantly equal and are available at any time in any

  This raises the problem of choice and adaptation.

  tation of these materials and manufacturing processes

  for such cables because, in addition to the electrical conductors

  still need support fibers which,

  together with the fastening agent> must always

  days to be in appropriate ratios relative to each other with regard to breaking length, elasticity, elongation at break and coefficients of expansion In addition, greater speeds of unwinding are sought and larger spans, so that it is necessary to provide fibers having breaking lengths as large as possible Finally, together with the copper conductors still isolated from varnish and having a diameter of the order of magnitude of approximately 0.07 mm and an elongation at break equal to or greater than 25%, the treatment of these fibers presents great difficulties.

  uniform electrical properties throughout the

  of such a line called conductive signals, these fibers must have a geometric disposition

  as uniform as possible in relation to the

  ports and wrapping fixing the position of the different

  components, so that, as a result of this

  tion, the unwinding properties of the line of conductive signals are strongly influenced by the coil of conductive wire in the body

to lead.

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  As a result, it is highly necessary

  to have a strand or cable as far as possible to meet all the requirements

  and even during long periods of manufacturing

  can be made with properties also

  uniform as possible, while being stuck uniformly

  and more easily than so far in the transfer in what is called a coil of wire

  driver and while also having properties.

  uniform unwinding after a long period of conservation. While using the extrusion process known from the patent application of the Republic

  Federal Republic of Germany DE-AS 26 38 763 for the manufacture

  the invention is to provide a new flexible electrical cable, a method for its manufacture and a device for carrying out the method, device

  whose structure and implementation make it possible

  electrical cables for the transmission of conductive signals without having to use natural silk fibers, these targets making it possible to reach large spans and high unwinding speeds while, despite the great length of these cables,

  the uniformity of the geometric arrangement of

  electric wires, support wires and

  in conjunction with the outside diameter

  of the cable is not altered along the length of the cable, while at the same time allowing easier and better bonding, in a reproducible manner, during the winding of the coils of conducting wire, the

  risk of destruction of the conductors under the

  fluence of heat being also reduced.

  According to the invention, for such cables, this object is realized because the conductors

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  electrically insulating lacquers are preferably bonded to one another and are held inside the support wires by a first extrusion layer fixing the position in the space of the support wires and the electrical conductors, while this first extrusion layer is surrounded by a second extrusion layer forming a uniform surface and conferring on the cable a

  cross section roughly circular.

  The method of the invention is characterized

  in that at least two, and preferably three, bundles of support wires are conveyed to the at least one electrical conductor (s), and on these bundles of of the conductors, a first extrusion layer is applied which fixes the position in the space and on which a second extrusion layer is then applied which contains conductors, support wires and the first extrusion layer at its center. forming a

  circular cross-section and a single surface

form.

  The device of the invention is characterized

  in that the cabling machine has a tamper

  unwind drum rotatable on a horizontal axis

  zontal and comprising spool holders suspended to the gimbal for the coils supporting the support son,

  as well as a distribution plate that can also

  turn on a horizontal axis and whose opening

  Central crossing lanes for drivers are

  arranged horizontally; the extruders are dis-

  placed one behind the other with dies also directed horizontally and located at the same

  level as the passage openings for the con-

  electrical conductors of the wiring machine and distribution plate; downstream of the last

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  extrusion industry, extends a zone of cooling

  It is also located at the same level, while a winding device is provided that unwinds both the conductors and the support wires and pulls them through the extrusion dies. The embodiment of the flexible cable according to the invention makes it possible to avoid, for the first time

  time, all wrapping and ensures, all along the

  the cable, a geometrical configuration con-

  In the same way, by using fibers of an aromatic polyamide (organic aramid fibers) as support wires, the latter, together with the metallic conductors, can be treated much more simply than up to

  present, since with regard to the subsequent application

  of the outer casing in the process

  of extrusion, tolerances must be maintained in order to

  brication much lower when feeding

  Directed conduction of conductors and support wires;

  by the extrusion process, both the

  It is also possible to use the metal bundles which the bundles of support wires hold in their center are fixed permanently in place. Since the second extrusion die also acts as a sizing die, a diameter is obtained.

  consistently uniform and high quality

  of the outer envelope.

  most of the difficulties caused by the natural-or synthetic silk Similarly, it avoids the difficulties associated with the extraction of the necessary solvent during the treatment with varnishes The varnish solutions used until now during

  the manufacture of such strands has a content of

  from about 20% to 40% maximum,

  the amount of solvent to be extracted is 60-80%.

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  Therefore, in particular, the bundles of

  Ports are no longer influenced by solvent residues Up to now, the solvent residues risked in particular to penetrate the bundles of support wires which subsequently became rigid, thus considerably altering the properties of the

  uncoiling the cable when used later.

  As demonstrated by tests, such a cable can also stick in windings

  remarkably and reproducibly during

  subsequent stroke because on the outer extrusion layer

  higher, an adhesive can be applied in a manner and to a degree that can be

  which the extrusion layers of winding layers

  juxtaposed elements adhering to the

  carriers / support wires are assembled to each other

  with a constantly equal grip force.

  In this way, we can also consider

  automated series production of such bobbins

  of conductive wires having permanent properties

  equal, which has a remarkably favorable influence on both price and reliability.

  flying bodies equipped with them.

  The extrusion layers surrounding

  The bundles of conductors / support wires are sufficiently elastic to follow elastic elongation stresses without being damaged or even destroyed. In addition, the extrusion layers make it possible to produce these cables with a smaller diameter and weight than previously, if although we can reach longer lengths

  than before, thus exerting an influence

  this favorable on the range of the conductive systems while also leading to greater reach for the same volume of windings Thanks to the weight

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  reduced cable, lower forces are also

  necessary to ensure the compensation of

  traction forces acting on the body to be steered.

  Finally, from now on, such cables can also be used without difficulty for underwater body conductor systems, since both the extrusion double layer prevents any penetration.

some water.

  Since polyether sulfones

  used in this case are extraordinarily

  fires, the additional benefit is that no flame retardants are to be used.

  special when making cables.

  The invention will be described with reference to an exemplary embodiment illustrated schematically in the accompanying drawings in which: FIG. 1 represents the cable during flight;

  Figure 2 illustrates, with a view of

  on a greatly enlarged scale, the structure

the cable;

  Figure 3 illustrates a manufacturing schema

  cable shown in Figure 2, and Figure 4 illustrates the layout of

  principle for the manufacture of a cable according to

  vention. In FIG. 1, the reference numeral 10 denotes a reaction-propelled flying body to which, starting from a stationary or mobile guiding station 11, guiding signals are conveyed via a strand or a

  flexible electrical cable 12 connecting the gui-

  and the body flying to each other.

  The cable 12 consists of two electrical wires

  conductor bars 14 with a diameter of about 0.07 mm made from electrolytic copper also pure

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  As far as possible from a high elongation at break (equal to or greater than 25%) before coating them in the support wires 16, by means of a varnishing process known per se, the stripped copper conductors 14 each receive an insulation 15, the application of the varnish taking place in several layers until a thickness of varnish is reached

  about 24 to 30 Å After the hardening of the iso-

  15, in another phase of work and using the same varnish that is constituted by the insulation 15, the individual copper conductors

  14 are glued parallel to each other to take

  the form shown in Figure 20

  As shown in Figure 2, the drivers

  Copper rods 14 bonded parallel to one another are in the center of a bundle of support wires 16 made of polyester or polyamide fibers.

presenting a slight commettage.

  In order to obtain the central position of the copper conductors bonded parallel to each other inside the bundle of support wires

  16 and over the entire length of the cable before it

  the wire bundle is divided into at least two, preferably three, bundles of support wires of the same dimension, each of these bundles of support wires having a diameter of about 14 and consisting, for example, of

elementary fibers.

  To fix the combination of the central copper conductors and the beams of

  support wires, a first layer of

  On this extrusion layer 18, it is

  another extrusion layer 19.

  With reference to FIG. 4, a device for the manufacture of the cable 2545972 will now be described.

illustrated in Figure 2.

  The electrical conductors 14 serving for the transmission of signals are unwound from a coil 40 shown schematically in FIG. 4 and, via a conductive device 41 comprising the guide tubes 42, 43 and 44, they are conveyed horizontally to a machine. of wiring 45 and they pass through a horizontal opening 47 of a

  unwinding drum 48 rotatable on a hinge axis

  rizontal The unwinding drum is driven by a

  adjustable electric motor 49 Moreover, the

  14 pass through a central opening (which is only sketched) of a distribution plate which can also rotate on a horizontal axis and which is firmly connected, by means of a stirrup 51, to the frame 52 of the machine wiring 45 so that the central opening is located at the same

  level that the central opening 47 of the drum

their.

  On the unwinding drum, by means of pa-

  Gimbalers 54 located in the marginal zone are mounted on coils 54 having the possibility of rotating on vertical axes relative to the axis of rotation of the unwinding drum and on which the support wires 16 are wound in two halves. preferably, in three bundles which have already been mentioned The bundles of support son are unwound from the coils 54 and they are also guided on the distribution plate 50 and, in fact, on openings distributed uniformly near the periphery ( also sketched) and inclined towards the central opening passage towards the latter through which the conductors 14 pass In this way, the conductors 14 passing through the central opening are locked in the center by

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  the bundles of support wires conveyed by the

marginal openings.

  Downstream of the distribution plate 50 are arranged two extruders E1 and E2, the dies 56 and 57 of which serve to expel the extrusion layers 18 and 19 are also located at the same level as the aforementioned passage openings of the

  Unwinder drum and dispensing plate.

  Downstream of the extruder E 2 there is provided a cooling zone 60 which is also at the same level. Finally, a winding device is provided.

  by which the forces of

  for conductors 14 and wire bundles

  supports 16 and by which also takes place the bobbin

  swimming of the cable definitely extruded.

  The unwinding forces are determined

  in a manner known per se by means of brakes (not shown

  here) being applied, for example, to the bearings of the coils 40 and 54. The speed of rotation of the unwinding drum driven by means of the motor 49 is adjusted according to the winding device 70 also driven by a motor (not shown here). )

  in such a way that taking into account the rate of extrusion

  In the bundles of support wires, a constant commissure length of about 3 to 6 is obtained.

  commits per meter of conductor length.

  Thanks to the cardan assembly of the coils 54 on the

  drum 48, it is possible to compensate for irregularities

  inevitable unwinding weeds As has already been explained, the distribution plate 50 serves to route the bundles of rotating support son on the conductors 14 (the latter being coated

  in the center), while at the same time

  determined, the bundle of conductors / wires

  supports in the entrance of the first extruder El.

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  In the present embodiment, the extruder die 56 has a diameter of 0.32 mm

  and it ensures a fixation of the conductor beam.

  The conductors / support wires without hollow intermediate space, the conductors thus remaining in the central position as well.

preferably, a polycarbonate.

  The extruder die 57 not only applies the second extrusion layer 19, but at the same time serves as a calibration die, thereby obtaining a circular cross section of the cable 12 and, at the same time, a high quality superficial This feature is favored because in the second extruder

  E 2, as an extrusion material, a polyamide is used.

  To be more complete, it will be mentioned again that the mentioned brakes (not shown)

  are regulated in such a way that both the

  14 that the bundles of support wires are unwound by the winding device to a voltage

traction of about ION.

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Claims (5)

  1 flexible electrical cable for transmitting signals between a guiding station and a body moving rapidly, this cable consisting of at least one, preferably, two essentially parallel electrical conductors and insulated by a varnish, these conductors being coated and almost at the center and over the entire length of a traction member formed of different carrier beams made up of numerous   thin individual threads, characterized in that the   lacquer-insulating electrical conductors (14) are preferably bonded to each other and are held inside the support wires (16) by a first extrusion layer (18) fixing the position in the space of the support wires (16) and the electrical conductors (14), while this first extrusion layer (18) is surrounded by a second layer   extrusion device (19) forming a uniform surface and   cable, a cross section roughly circular. Cable according to Claim 1, characterized in that the bundles of support wires (16) consist of aromatic polyamide fibers with an elongation at break of 2.4 to 4%; the copper conductors (14) bonded parallel to one another have a diameter of about 0.07 mm; the first extrusion layer (10) consists of a polycarbonate and the second extrusion layer (19) of a polyamide,   while the cable diameter (12) is equal to or less than 0.45 mm.   3 A method of manufacturing a flexible electrical cable for transmitting signals between a guiding station and a rapidly moving body, this cable consisting of at least one, preferably two, parallel electrical conductors glued together   to the other and isolated by a varnish, these drivers   so much wrapped basically in the center and on any 2545972   the length of a tensile member formed of different individual bundles of support wires consisting of numerous thin individual wires, characterized in that, at (x) electric conductors (14), the   almost at the center, at least two and, preferably,   three beams of support wires (16) and,   on these bundles of support wires (16) of the   conductors, a first extrusion layer (18) is applied which fixes the position in the space and on which a second extrusion layer (19) is then applied, at its center, conductors (14),   support wires (16) and the first extrusion layer   sion (18) while forming a cross-section circular and a uniform surface.   4. Process according to claim 3, characterized   in that the electrical conductors (14) are guided approximately horizontally with a tensile stress of 1 ON; the bundles of support wires (16) are rotated around the conductors (14) at a rate of 3 to 6 counts per meter and with a voltage of   traction del ON; the conductors (i 4) and the wires   ports (16) which are turned around are fixed in place in the desired direction by the first extrusion layer (18) with practically no cavities and then, by means of the second extrusion layer (19), the section thereof is determined cross-section and the outer diameter, after which the cable (12) thus formed is passed   through a cooling device and it is rolled.   Process according to any one of the claims   cations 3 and 4, characterized in that, as   electric wires, iso-   lacquered, glued parallel to one another and having a diameter of 0.07 mm; as the support yarns, polyamide fibers with an elongation at break of 2.4 to 3% are used; As the first extrusion material, a polycarbonate is used and, as 162545972   second extrusion material, a polyamide is used.   6 Device for carrying out the method   according to any one of claims 3 to 5 in   using a curing machine with electrical conductors routed to the center, characterized in that   the cabling machine (45) has a tumbler drum   bearing (48) rotatable on a horizontal axis and having gimballed spool holders (49) for the spools (54) supporting the support wires   - (16), as well as a distribution plate (50) for   also turn on a horizontal axis and   the central passage openings (47) for the con-   drivers (14) are arranged horizontally; the former   trudeuses (El, E 2) are arranged one behind the other   with channels (56,57) also directed horizontally   located at the same level as the openings   of passage for the electrical conductors of the   China wiring and distribution board; downstream of the last extrusion die (57), extends a cooling zone (60) also located at the same level, while a device is provided   winding (70) uncoiling the conductors   that the wire supports and pulls them through extrusion dies.