FI69529B - FLERLEDARSTARKSTROEMSKABEL OCH DESS FRAMSTAELLNINGSFOERFARANDE - Google Patents

Description

69529

The present invention relates to a multi-conductor high-current power cable or wire, in particular for a low voltage 5, the insulated conductors of which are spaced at intervals in a variable helical direction (SZ).

Telecommunication cables have long been manufactured to varying degrees. Using SZ repetition. In this case, the individual repeat elements are known to be repeated 10 so that the direction of the thread varies from sector to sector.

This method of repetition allows the use of fixed unloading and rewinding devices and completely uninterrupted repetition. This repetition is also already used in the manufacture of high-current cables and similar wires. Thus, for example, it is already known (DOS 2 202 643) to repeat high-current cables in which the direction of the thread or the length of the thread at the ends of the gaps varies. This is also the case when the number of individual conductors is larger. Reverse repetition of conductors has also already been used for higher energy transfer and thus for larger cross sections of conductors. In this case, the cable conductors are first bundled, after which they pass as a bundle of Pingo-25 as they pass over a predetermined distance, which is limited by another repetition point, and are repeated with each other within this predetermined travel and transit time (DOS 2 742 662).

In all these methods, the starting point for the repetition is the repetition elements already in the form of conductors, i.e. electrical conductors with electrically insulated conductors. These conductors are manufactured in separate work steps before repetition. This manufacture therefore also involves winding and unwinding or winding steps, 2 69529 storage, etc. This applies in particular to all cases in which the conductors do not have the shape of a solid strand but are made of single wires.

The invention is based on the known possibilities of SZ-repetition of cables and wires used in the transmission area-5a. The object of the invention is to further simplify the manufacture of cables and wires based on SZ-repetition technology and thus to save manufacturing costs.

According to the invention, this object is solved in such a way that the insulated conductors consist of multicore conductors, the individual wires of which are likewise stranded in the varying helical direction of the gaps. Such a cable meets the requirements of its electrical properties and guarantees good flexibility. If, in accordance with a further embodiment of the invention, the insulation is applied immediately on top of the multi-wire conductor, the secure retention of the individual wires in the bond is guaranteed in a simple manner.

In order to produce a cable or conductor according to the invention, it is expedient to proceed in front of a known SZ-repetition of conductors with a repetition of individual wires drawn from fixed-bearing stocks of conductors according to SZ-repetition, followed by simultaneous insulation of conductor elements in an extruder. eg multi-nozzle head. This simultaneous insulation is a prerequisite for the next work step, but in the same work cycle, to repeat the insulated conductors at intervals in a variable helical direction and to finally place the outer sheath in place, possibly using a rounded inner sheath or winding. This manufacturing process, which, starting from the fabrication of the conductor 35, comprises all subsequent fabrication steps in a single continuous cycle, enables high fabrication speeds. Winding and unwinding equipment, as well as the preparation times required so far, can be further saved, and there is no need to reserve storage space for prefabricated conductor lengths.

Depending on the respective conductor material, it can sometimes be advantageous in the further development of the idea of the invention that the conductor wires twisted with a thread of varying direction are provided with a strip, i.e. a conductive or insulating tape is wound around them. This measure may already be appropriate when the distance between the rewinder and the insulating extruder has to be so great due to the machines that there is a risk 15 that the twisted individual yarns will unwind. If, on the other hand, the reeling device and the extruder can be placed so close to each other that the insulation can take place immediately after reeling, the yarns will certainly remain bonded due to the extruded plastic mass 20, which is e.g. based on polymeric raw materials.

In the method according to the invention, it is further essential that the insulation of the conductors takes place simultaneously. For this purpose, several single extruders connected in parallel, depending on the number of conductors 25, can be used. Sometimes, however, it may be more advantageous, especially in view of the control of the units, to use a known extruder with a multi-press head for the simultaneous insulation of all conductors.

The quality of the conductors, in particular also in larger diameter conductor elements, can be improved in an embodiment of the invention in which the individual wires of the conductor elements multiplied by a thread of varying direction are compressed before their simultaneous insulation. For this purpose, for example, a traction nipple or a correspondingly functioning pair of rollers can be arranged before the insulating extruder or presses of each conductor element.

5 The individual wires of the conductor elements can all be wound together at the same time, in which case reeling devices known per se can be used. However, the individual conductors of the conductor can be repeated in layers, for example on top of the core wire, using the method of twisting insulated conductors known from tele-10 cable technology.

Another possibility, which further reduces the risk of unwinding before insulation, i.e. improves the stability of an uninsulated conductor, according to a further embodiment of the invention, is to combine the individual wires of the conductor into bundles and to twist the conductor elements of these bundles in a variable thread. These bundles are then twisted into multi-wire conductors, whereby the twisting into multi-wire conductors in the same way takes place with a thread of varying direction.

The invention will be explained in more detail in connection with the method of manufacturing multiconductor high-current power lines shown in Fig. 1 as an exemplary embodiment.

From the fixed bearings 25 not shown, the individual wires 1 of each conductor are fed to a winding device known per se, e.g. a rotating perforated plate, where they are wound at intervals in an alternating helical direction into conductor elements 3. These conductor elements, e.g.

30 here are four, fed to a four-extruder 4, where they are insulated, so that an insulated conductor 5 is obtained.

5 69529 The core thus prepared is then fed to the inner jacket extruder 7 and finally to the outer jacket extruder 8. After passing through the cooling channel 9, the finished wire 10 is wound on a fixed bearing winding drum 11. leads to high manufacturing speeds. Hitherto, the necessary winding and unwinding steps have been avoided in the manufacture.

10 Any known method and apparatus can be used for the SZ repetition itself. However, the device known from telecommunication cable technology (DOS 2,411,151 and DE patent publication 2,615,275) has proved to be particularly advantageous for SZ-twisting of clear, i.e. uninsulated conductor-15 wires. This consists essentially of a fixed perforated plate and a rotating bearing, used perforated plate, with a smooth-surfaced tube fitted between these plates. This tube is further surrounded by another concentric tube, the inner diameter of which is so large that the holes in the perforated plate and thus also in the corresponding holes in the guide plate are located inside this outer tube. The perforated plate is also provided with a peripheral edge surrounding it, through the holes of which the part passing outside the outer tube of the collecting elements passed through the respective holes of the guide plate can be passed. In this case, the individual wires of the conductor can be superimposed on top of each other in two layers, whereby the direction of the thread varies in both layers. Of course, the invention is not limited to this particular type of SZ repetition. Other known methods and devices can also be used depending on the quality and cross-section of the conductor elements.

Claims (8)

1. Multi-part strong current cable or line, especially for low voltage, whose insulated conductors are twisted with spaced alternating direction (SZ), characterized in that the insulated conductors consist of multistable conductors, whose single wires are also twisted with spaced alternating direction. . 2. A cable or conduit according to claim 1, characterized in that the insulation is applied immediately to the multi-wire conductors. 3. A method for producing a cable or conduit according to claim 1 or 2, wherein the twisting of the conductors and the application of the additional layers to the final sheath takes place in a continuous working process, characterized in that the sealing is connected before this working process. the single threads in the conductors are pulled off from the permanently stored stock which are twisted according to the SZ twist and immediately thereafter an extruder for simultaneously applying the insulation to all the conductors is applied, so that the SZ twist of the isolated conductors takes place after the isolation in a connection work operation but in the same work process and that external men are finally applied, possibly under the application of a rounded inner sheath or winding. 4. A method according to claim 3, characterized in that the conductor wires twisted in a reversing manner are provided with strips before their insulation. 30 5. A method according to claim 3, characterized in that the simultaneous isolation of all conductors takes place in an extruder with a multiple-spray head. li