EP3775367A1

EP3775367A1 - Stranding machine

Info

Publication number: EP3775367A1
Application number: EP19715079.0A
Authority: EP
Inventors: Jürgen Kohl; Mathias Schmidt; Helmut Lämmermann; Andreas Kraus
Original assignee: Maschinenfabrik Niehoff GmbH and Co KG
Current assignee: Maschinenfabrik Niehoff GmbH and Co KG
Priority date: 2018-04-12
Filing date: 2019-04-01
Publication date: 2021-02-17
Also published as: DE102018205566A8; MX2020006332A; CN111655926A; CN111655926B; JP7396994B2; DE102018205566A1; JP2021517934A; WO2019197193A1; US11946200B2; US20210001390A1

Abstract

The invention relates to a stranding machine for producing a cord (1) from a plurality of wires, preferably metal wires. The stranding machine has a stranding device for stranding the wires, comprising at least one rotatably mounted deflecting roller (9) for deflecting the cord (1) and at least one guide device (8) for guiding the cord (1). The guide device (8) is arranged in such a way that the cord (1) can be guided on a straight line from the guide device (8) to the deflecting roller (9) in such a way that the cord (1) is pressed against a first flank (9a) of the deflecting roller (9). As the cord is deflected by the deflecting roller (9), the cord (1) moves from the first flank (9a) into the roller base (9b) of the deflecting roller (9). At the same time, if the first flank (9a) is chosen accordingly, the cord (1) moves with the torsion produced by the stranding process, whereby the twist and the tendency of the cord to "curl" are reduced.

Description

114692P22PC

bunching machine

Description

Hereby, the entire contents of the priority application DE 10 2018 205 566.1 by reference is part of the present application.

The present invention relates to a Verlitzmaschine for producing a strand of a plurality of, preferably metallic, wires. In the Verlitzmaschine several such wires are twisted together by twisting, d. H. processed into a stranded wire. The wires are preferably made of a copper alloy, particularly preferably of a copper-magnesium or copper-tin alloy, for example with a proportion of 0.2 or 0.3% of magnesium or tin, or preferably also of a copper alloy. silver alloy.

A Verlitzmaschine of the type considered has a Verlitzvorrichtung for wire entanglement.

Preferably, the Verlitzvorrichtung has a rotating rotor, which has an elongated, radially outwardly curved and rotatably mounted at its two ends rotor bracket. The majority of the wires are fed to the rotor and routed over the rotor yoke, thereby twisting the wires at one or more lug points. Preferably, the Verlitzmaschine a rotatably mounted pulley for removing the wire from the Verlitzvorrichtung. Preferably, the pulley is driven to generate the required tension to pull the strand.

After removing the strand from the Verlitzvorrichtung the strand is preferably wound by means of a suitable winding device on a spool or processed directly. If the strand is wound onto a spool, it generally has a cylindrical spool core for winding with the stranded wire and a disk-shaped flange at the two ends of the spool core in order to prevent the windings from slipping off the spool core. During winding with the strand, the coil generally rotates about the longitudinal axis of the spool core (hereinafter referred to as "coil axis" for short).

In particular, in Verlitzmaschinen the type described above with a rotor yoke, which are operated as a double-stroke Verlitzmaschinen, possibly the pulley and possibly also the winding device and the coil for winding the strand preferably within the rotational volume of the rotor yoke, d. H. within the space around which the rotor bar rotates. Therefore, there is only a limited space available for the pulley, the winding device and / or the coil. The coil axis may be arranged substantially at right angles to the rotor axis, substantially parallel to the rotor axis or in another angular position relative to the rotor axis. The strand preferably emerges from the rotor along the rotor axis.

The problem with the produced strand is that it can have a twist. In addition, the strand in the unloaded state tends to bend, to "wrinkle" and to "rollovers", ie loops. This is problematic in the further processing of the strand, especially when winding on a coil, during assembly and crimping, ie when clamping connectors to the strand. This further complicates the extrusion, ie the casting of the strand with a plastic insulation in an extrusion process. In particular, the phenomena mentioned in extrusion hinder the use of so-called bag runs, which operate continuously, instead of rotating tangential runs, which do not operate continuously and only allow a significantly lower feed rate of the strand.

Finally, the swirl and the tendency of the strand to "curl" reduce the possible number of bending cycles, i. H. the number of bending cycle cycles that can be performed without material fatigue or failure.

It is therefore an object of the present invention to provide a Verlitzmaschine and a method for producing a strand, so that the strand produced at most a small swirl and a low tendency to "wrinkle" having.

This object is achieved by the Verlitzmaschine and the method for producing a strand according to the independent claims. Advantageous embodiments of the invention are contained in the dependent subclaims.

The invention is based on the observation that the twist and the inclination of the strand to "curl", by a movement in the direction of the stranding caused by the stranding, hereinafter called "Verlitztorsion", preferably in conjunction with a stretching the strand, ie a stretch, which leads to a plastic deformation of the strand, can be reduced. In the stranding machine according to the invention and the method according to the invention for producing a strand, therefore, at least one measure is implemented which takes this observation into account.

An inventive Verlitzmaschine has at least one rotatably mounted pulley for deflecting the strand and at least one guide means for guiding the strand, wherein the guide means is arranged such that the strand can be guided in a straight line from the guide means to the pulley, that the Litz is pressed against a first edge of the pulley.

The deflection roller has a conventional structure, wherein the running surface for the strand on the end face of the deflection roller has a wedge-shaped depression in cross-section. This wedge-shaped depression has a first and a second flank, directed obliquely radially inwardly toward the center plane of the deflection roller. The area near the inner edges of the two flanks, where the radius of the tread is the smallest, is referred to as the roll bottom.

During the deflection by the deflection roller, the strand moves on its way from the entry point to the exit point from the first edge of the deflection roller into the roller base. To put it clearly, the strand slips down into the bottom of the roll on the first flank. The strand undergoes a movement, which takes place with or against the Verlitztorsion. By correspondingly selecting the first flank from the two flanks of the running surface of the deflecting roller, it is possible to achieve that the movement of the strand takes place with the twisting of the strand, whereby the tendency of the strand to "curl" is reduced.

In a preferred embodiment of the invention, a pulling device is additionally arranged in the direction of movement of the strand behind the deflection roller, which is suitable for exerting a tensile force on the strand running from the deflection roller. This results in a stretching of the strand, ie a Elongation, which leads to a plastic deformation of the strand, whereby the tendency of the strand to "curl" is also reduced.

Preferably, the pulling device is a winding device. Such a winding device is already provided in many Verlitzmaschinen already to wind the strand produced. By the winding device, the desired tensile force can be exerted on the running of the pulley strand, in particular by a driven coil axis in the winding device. In a further preferred embodiment of the invention is a

Litzenberührungspunkt on the guide device, of which the strand can be performed in a straight line to the pulley so that the strand is pressed against the first edge of the pulley, offset from the median plane of the pulley. As a result, the strand runs eccentrically on the guide roller and is pressed in this way by itself against the first edge of the guide roller, without a further pressing device is required.

In a further preferred embodiment of the invention, the guide device is arranged such that the strand can be guided in a straight line from the guide device to the deflection roller such that the strand is pressed against a second edge of the deflection roller which is different from the first edge. The strand can thus be selectively pressed against the first or against the second edge of the deflection roller. This selection can be made depending on the direction of impact of the strand, ie the direction in which the individual wires are twisted together during stranding and on which also the twisting of the strand depends. A distinction is made here between the so-called S-beat, in which the wires are wound around each other in the counterclockwise direction, and the so-called Z-beat, in which the wires are wound around each other in a clockwise direction, this characteristic being invariant with respect to the direction in which the strand is stranded is looked at. Preferably, the guide device is movable relative to the deflection roller, in particular substantially perpendicular to the central plane of the deflection roller movable. In this way, the strand touch point on the guide device can be adjusted accurately relative to the deflection roller. Further preferably, this also the edge of the deflection roller, against which the strand is to be pressed, select.

Additionally or alternatively, the selection of that edge of the deflection roller against which the strand is to be pressed can also be made by guiding the strand on different sides of the guide device.

In a further preferred embodiment of the invention, the guide device is a rotatably mounted guide roller. As a result, the friction of the strand against the guide device can be reduced.

The invention further relates to a method for producing a strand of a plurality of, preferably metallic, wires for execution on a Verlitzmaschine invention. In the method, the wires are stranded in the Verlitzvorrichtung, the strand is guided from the Verlitzvorrichtung to the guide device, the strand is guided in a straight line from the guide device to the guide roller, that the strand is pressed against the first edge of the guide roller, the strand is deflected by the pulley, and the strand is led away from the pulley.

In this case, the strand preferably moves during the deflection by the deflection roller from the first edge into the roller base of the deflection roller.

By virtue of the guidance of the strand, due to the mechanisms described above, the twist and the inclination of the strand to "curl" are reduced. An advantageous embodiment of the invention is illustrated in the accompanying drawings in conjunction with the following description. Showing:

Fig. 1 is a perspective view of a section of a Verlitzmaschine invention with the course of the strand.

In Fig. 1, the course of the strand 1 is represented by a Verlitzmaschine invention, which is preferably a double-stroke Verlitzmaschine in the embodiment. The Verlitzmaschine has a Verlitzvorrichtung, in which a rotor with a rotor bracket (not shown) rotates. Inside the rotation volume of the rotor yoke, a housing 2 is suspended at its left and at its right end by means of two rotor shaft bearing housings on two separate rotor shaft sections (both not shown).

The strand 1 passes through an opening 3 in the housing 2 through to a driven pulley 4, which subtracts the strand 1 by applying a tensile stress from the Verlitzvorrichtung. The take-off disk 4 as well as a removal roller 5 arranged above the take-off disk 4 and parallel to it each have a plurality of running grooves through which the strand 1 is guided alternately so that the strand 1 alternately passes through the take-off disk 4 and the removal roller 5 in total. The take-off disk 4 and the unloading roller 5 act as a first torsion lock.

Then, the strand 1 passes through two pulleys 6 and 7 and is deflected a total of 270 degrees. In this case, the guide roller 7 is easily employed, so that the running of the guide roller 7 strand does not collide with the run-up on the guide roller 6 strand.

Thereafter, the strand 1 runs on a - in the embodiment on the left - side of a rotatable guide roller 8 along whose axis is approximately perpendicular. The guide roller 8 causes the stranded wire 1 to be easily removed from its path is deflected and does not run in the middle of the following guide roller 9, but against a - seen in the embodiment against the left in the direction of the strand 1 - flank 9a of the guide roller 9 is pressed. The position of the guide roller 8 relative to the guide roller 9 can be accurately adjusted by a vernier 12. With the help of the vernier 1 2, the axis of the guide roller 8 can be reciprocated substantially orthogonal to the center plane of the guide roller 9.

The strand 1 wraps around the deflection roller 9 slightly less than 180 degrees. On its way from the entry point to the deflection roller 9 on the left flank 9a to the exit point, the strand 1 moves from the flank 9a into the roll base 9b. The strand 1 thereby moves with the Verlitztorsion, whereby the above-described tendency of the strand to "wrinkle", is reduced. The Verlitzmaschine further comprises a laying device 16 with the other guide rollers 10 and 1 1, which along a laying axis on a spindle (not shown) is movable. The spindle is mounted in two (shown in Fig. 1 shown cut) bearings 13, 14 and is driven by a (also cut shown) drive wheel 15. The spindle runs parallel to the spool axis of the winding spool of a winding device

(also not shown).

The strand 1 runs parallel to the spindle of the laying device 16 from the guide roller 9 and thus runs, regardless of the displacement position of the laying device 16, always at the same angle to the guide roller 10 of

Laying device 16 on. By the pulleys 10 and 1 1, the strand 1 is again deflected to finally led to a winding device and there on a reel spool (both not shown) to be at the predetermined by the displacement position of the laying device 16 axial position of the reel spool wound on this. In this case, the driven reel spool exerts a tensile force on the stranded wire 1, whereby the stranded wire 1, preferably with a high contact pressure, is pressed against the deflection roller 9 and thus slightly stretched between the deflection roller 9 and the reel spool, typically by 2 to 3%. In this way, the helix structure that the strand undergoes by stranding is further minimized or even completely removed. The guide roller 9 acts in this respect as a (second) torsion barrier.

LIST OF REFERENCE NUMBERS

1 strand

2 housings

3 opening

4 pulley

5 unloading roller

6, 7 pulleys

8 leadership role

9 pulley

9a first flank

9b roll reason

10, 1 1 pulleys

12 vernier

13, 14 bearings

15 drive wheel

16 laying device

Claims

claims

1. Verlitzmaschine for producing a stranded wire (1) of a plurality of, preferably metallic, wires which a Verlitzvorrichtung for

Having at least one rotatably mounted deflection roller (9) for deflecting the stranded wire (1) and at least one guide means (8) for guiding the stranded wire (1), wherein the guide means (8) is arranged such that the stranded wire (1) on a straight line from the guide means (8) to the

Guide roller (9) can be performed so that the strand (1) against a first edge (9a) of the guide roller (9) is pressed.

2. Verlitzmaschine according to claim 1, characterized in that in the direction of movement of the strand (1) behind the deflection roller (9) has a

Pulling device is arranged, which is adapted to exert on the running of the guide roller (9) strand (1) a tensile force.

3. Verlitzmaschine according to claim 2, characterized in that the pulling device is a winding device.

4. Verlitzmaschine according to any one of the preceding claims, characterized in that a Litzenberührungspunkt on the guide means (8) from which the strand (1) on a straight line to the deflection roller (9) can be performed such that the strand

(1) is pressed against the first flank (9a) of the guide roller (9), relative to the center plane of the guide roller (9) is offset.

5. Verlitzmaschine according to any one of the preceding claims, characterized in that the guide means (8) is arranged such that the stranded wire (1) on a straight line so of the Guiding device (8) can be guided to the deflection roller (9) that the stranded wire (1) against a second, of the first edge (9a) different edge of the deflection roller (9) is pressed.

Verlitzmaschine according to any one of the preceding claims, characterized in that the guide device (8) relative to the deflection roller (9) is movable, in particular substantially perpendicular to the center plane of the deflection roller (9) movable.

Verlitzmaschine according to any one of the preceding claims, characterized in that the guide means is a rotatably mounted guide roller (9).

Method for producing a stranded wire (1) from a plurality of, preferably metallic, wires for use on a stranding machine according to one of the preceding claims, wherein the wires in the Verlitzvorrichtung are stranded, the stranded wire (1) from the Verlitzvorrichtung to the guide device (8 ), the stranded wire (1) is guided in a straight line from the guide device (8) to the deflection roller (9) such that the stranded wire (1) is pressed against the first flank (9a) of the deflection roller (9), the strand (1) is deflected by the deflection roller (9) and the strand (1) is guided away from the deflection roller (9).

Method for producing a stranded wire (1) according to claim 8, characterized in that during the deflection by the deflection roller (9) the strand (1) moves from the first flank (9a) into the roller base (9b) of the deflection roller (9) ,