WO2008049146A1 - Method for producing twisted cable from sector-shaped cables - Google Patents

Abstract

In a method for producing, in particular, sector-shaped twisted cable with an alternating direction of lay from single cable cores (2) along a twisting axis, the single cable cores are aligned in an inlet region (3), anchored to prevent torsion, and bundled to form a cable strand (4) at a first twisting point (5). The cable strand (4) is twisted between the first twisting point (5) and a second twisting point (8) about the twisting axis, and the cable strand (4) is again anchored after the second twisting point (8) to prevent torsion. Since the cable strand (4) is twisted and then not twisted at intervals between the twisting points (5, 8), while being continuously fed along the twisting axis, a twisted cable strand (4) can be produced in which the distance between two reversing points is twice as long as the length of the storage section between the two twisting points (5, 8).

Description

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Method of producing sector-shaped cable wounds

ladders

The invention relates to a method for producing in particular sector-shaped Kabelversilungen with alternating direction of impact of individual cable cores along a stranding, in which the individual cable cores aligned in an inlet region, held against rotation and bundled in a stranding strand to a strand, the strand between the first Verseilpunkt and a second Verseilpunkt is twisted in the stranding axis and the strand after the second Verseilpunkt is again held against rotation.

For producing such Kabelversilungen it is known, individual wires, strands, cores, etc., the outside isolated and possibly already stranded bundles of individual wires or strands, by twisting devices, such as rotating discs, lead and in the SZ process to strand. These stranding methods are not suitable for SZ stranding of sector-shaped wires.

In a generic method described in EP 7473 A, cable cores are first bundled in a stranding nipple. Subsequently, the cable bundle is fed to two rotors, which form a strand store between them. With the help of the two rotors, the bundled strand is twisted in the stranding axis. With the aid of this device, although cables can be made of sector-shaped wires, but there is the further disadvantage that the turning points of the stranding always represent a limitation of the bending behavior in the stranded cable especially for very stiff wires or cables. In addition, rejects occur after a product change or other business interruption, if in the course of this work a stretched, i. non-stranded product is drawn into the storage section.

The invention is therefore based on the object to provide a method for producing a Kabelversilung available, which avoids these problems or at least reduced. This object is achieved according to the invention with a method comprising the method steps of claim 1.

An advantage of the method according to the invention is that after passing through the storage section, a finished stranded product always enters the withdrawal line after the storage line. This is not the case with the method of EP 7473 A, since the strand during the starting process, eg after a product change or another business interruption, can not enter the storage section in a pre-stretched manner, but is inevitably stranded at the two stranding points during the running process. The resulting incorrect lay length over the length of the storage line is lost as waste.

Another effect is the virtual doubling of the available. Storage section ^' in an embodiment of the invention, when the strand is stranded in alternating direction of rotation and stopping the rotors alternately at the two stranding points. This results in a stranded strand, in which the distance between two turning points is twice as long as the length of the storage path. As a result, the number of turning points in the product can be halved. Since these turning points always represent a weak point with regard to the flexibility of a cable construction, on the other hand, the plant length is subject to structural restrictions, this type of reduction of turning points on the product is very advantageous.

With the stopping of the rotors for the passage of a memory track length can also be achieved in the following rotation of the rotors in one direction also the advantage that when starting the line no drop in the length of the storage path is formed. This embodiment of the method also makes use of the fact that with the change of the stranding points, with the direction of rotation of the rotors remaining the same, the direction of impact is also changed.

Preferred embodiments of the invention are subject of the dependent claims.

Further features and advantages of the method according to the invention will become apparent from the following description of preferred embodiments of the method according to the invention with reference to the accompanying drawings. 1 to 6 show a first embodiment of the invention and FIGS. 7 to 11 show a second embodiment of the invention.

A device with which the method according to the invention can be carried out, as known per se from EP 7473 A, for example stationary coil runs 1, of which the sector-shaped wires 2 run to a stationary guide means 3. In the guide device 3, the sector-shaped cores 2 are brought together according to their geometry in the first stranding nipple to form a strand 4. By the guide device 3, the strand 4 is held simultaneously against rotation. That is to say that it does this by means of a first rotor 6 arranged after a first stranding point 5 _

generated torque and the consequent plastic deformation of the sectoral cores 2 intercepts, without causing damage to the core insulation occurs.

At a certain distance from the first rotor 6, a second rotor 7 is arranged, which is preferably synchronously, ie with the same direction of rotation and the same speed as the first rotor, 6 driven. After the second rotor 7, a second stranding point 8 is arranged and after this second stranding point 8, a take-off device 9, which is preferably designed as a caterpillar take-off. The caterpillar take-off 9 captures the torque exerted by the second rotor 7 on the strand 4 and the consequent plastic deformation of the sector-shaped cores 2, without damaging the core insulation. The two rotors 6, 7 are preferably designed as non-driven belt rotors which tightly surround the strand 4, but without damaging the core insulation. One or both band rotors 6, 7 can also be driven if necessary. In addition, other known prior art devices may be used instead of tape rotors to twist the strand 4 to make the stranding.

A yarn or band winder 10 can be provided between the two rotors 6, 7, with which the stranded cores 2, in particular in the region in which they pass from the extended region into the twisted region, are prevented from being turned up or turning back. This function can e.g. Also take a rotating roller bar with correspondingly shaped, opposite pressure rollers or a similar construction. This device for preventing untwisting or reverse rotation is particularly advantageous if the wires 2 are themselves already stranded bundles of individual wires or strands, since they are substantially more elastic than solid wires 2, which are largely plastically deformed.

The distance between the two stranding points 5, 8, which are preferably designed as Verseilnippel, forms the storage stretch for stranding in the same direction and the same impact long. After the strand 4 has passed through the first stranding point 5, there is a change in the rotational speed and / or the direction of rotation of the two rotors 6, 7. From the prior art (EP 7473 A) it is known that in a change in the direction of rotation in the second Verseilpunkt strike in alternating direction of impact (SZ beat) as well as a halving of the strike length arise. At a speed range _

tion without reversing the direction of rotation is also achieved a changing direction of impact.

In the method according to the invention, however, are always after the

Passing through a length of the strand 4, which corresponds to the length of the storage line, both rotors 6, 7 stopped and after the

Passing through another length of the strand 4 driven again and so on.

FIGS. 1 to 6 schematically show a first embodiment of the method according to the invention in successive steps. In the first step, the bunched strand entering the stranding point between the stranding points 5 and 8 in the stranding point 5 is twisted by the two rotors 6, 7 rotating to the right, for example (FIG. 1), until the entire storage stretch passes through in this way a right-handed strand is filled (Fig. 2).

In the second step, the two rotors 6, 7 are stopped, while the strand continues to be withdrawn at a constant speed through the tape draw 9. The strand stranded or twisted to the right thus passes through the second stranding point 8 without being further twisted. At the same time, a stretched, that is not twisted, strand runs through the first stranding point 5 into the storage stretch until the previously twisted strand has completely run out of the storage stretch and the stretched strand has reached the second stranding point 8 (FIG. 3).

In the third step (FIG. 4), the two rotors 6, 7 are driven again, in the opposite direction of rotation, ie to the left. The previously stretched strand, now passing through the second stranding point 8, is now also twisted in the second stranding point 8, a strand with clockwise rotation still being generated by the rotor 7 turning to the left in the stranding point 8.

In the end, therefore, a twisted or stranded strand is produced in which the length with a uniform direction of rotation or impact twice as long as the storage section.

While the two rotors have been rotated 6.7 in the third step to the left and the stretched strand has leaked out of the storage line, subsequently a strand has run through the first stranding point 5 in the storage path, which through the - -

Left turn of the rotor 6 has received a left turn. At the moment in which the strand has reached the second stranding point 8 with this left-hand rotation, the rotors 6, 7 are stopped again. Since from the stranding point 8 a strand leaked with clockwise rotation and the stranding point 8 has reached a strand with left rotation, a turning point has arisen in this point.

The rotors 6, 7 are then stopped again in the fourth step (FIG. 5), so that the strand turned to the left runs out of the storage path and a stretched strand enters the storage path.

The rotors 6, 7 are subsequently rotated to the right in the fifth step (FIG. 6), which functionally corresponds to the first step (FIGS. 1 and 2), so that the strand passing through the second stranding point 8 likewise undergoes a left turn, thus altogether again a stranded strand section is generated, which has a left turn over the length of the double storage path.

By again stopping and then turning the rotors 6,7 is then again, as described above, generated by a turning point separate strand section with clockwise rotation. With reference to Figures 7 to 11, a second embodiment of the method according to the invention will be described in which the rotors 6, 7 are alternately driven and stopped at substantially equal intervals of time as in the embodiment described with reference to Figures 1 to 6 become. However, the difference lies in the fact that the rotors 6, 7 are always driven in the same direction, that is, either to the left or to the right. This has the consequence that the length of the strand between two turning points corresponds to the length of the storage path between the two stranding points 5 and 8. Specifically, again in the first method step (FIGS. 7 and

8), the two rotors 6, 7 synchronously in a rotational direction, for example, to the right, rotated, so that in the memory section, a strand is rotated to the right. In the second process step (Fig.

9), the two rotors are stopped 6.7, so that the twisted to the right strand from the storage line expires and a stretched

Strand runs into the storage line. In the third method step (FIG. 10), the two rotors 6, 7 are again rotated in the same direction as in the first method step, so that a left-rotated strand is produced in the second stranding point 8. At the same time in the storage section in the first stranding point 5 again - -

produced twisted strand on the right, which enters the storage section and in the fourth step (Fig. 11) expires again at the stopped rotors 6,7 unaffected by the stranding 8 from the storage section. In principle, it can be noted for all embodiments of the invention that, as a rule, the rotational speed of the rotors 6, 7 will also be constant at a constant take-off speed of the strand 4. However, it is also possible to change the lay length or the number of strokes per unit length of the finished strand strand 4 over larger or smaller sections within an interval by the rotational speed of the rotors 6, 7 is changed in correspondingly long or short periods. It is also possible for the two rotors 6, 7 not always to run synchronously, but they can be driven temporarily with different speeds and / or rotational directions within individual intervals.

Claims

- -Claims 1. A method for producing in particular sector-shaped Kabelversilungen with alternating direction of impact from individual cable cores (2) along a stranding, in which the individual cable cores (2) aligned in an inlet region (3), held against rotation and in a first stranding point (5) a strand (4) are bundled, the strand (4) between the first stranding point (5) and a second stranding point (8) is twisted in the stranding axis and the strand (4) after the second stranding point (8) is again held against rotation , characterized in that the strand (4), while continuing to run continuously in the stranding axis, is rotated at intervals between the stranding points (5, 8) and is not twisted. 2. The method according to claim 1, characterized in that the strand (4) alternately rotated in intervals in one direction, not twisted and then rotated in the other direction. 3. The method according to claim 1, characterized in that the strand (4) is alternately rotated at intervals always in the same direction and stopped. 4. The method according to claim 1, characterized in that the strand (4) by means of two synchronously driven rotors (6, 7), preferably band rotors, which are arranged at a distance from each other, is rotated. 5. The method according to any one of claims 1 to 4, characterized in that the wires (2) between the two stranding points (5, 8), in particular between the two rotors (6, 7), are prevented from being turned on or jerking. 6. The method according to claim 5, characterized in that the cores (2) between the two stranding points (5, 8), in particular between the two rotors (6, 7), are wrapped around the cores (2) at the turning or Prevent turning back. 7. The method according to any one of claims 1 to 6, characterized in that the duration of an interval corresponds to that time in which the strand (4) passes through the path between the two stranding points (5, 8).