EP1612325B1 - Flyer bow for a wire stranding or cabling machine - Google Patents

Abstract

The flyer bow (1), for wire manufacturing machines, has a tube (7) along the center of its inner flank (4) of a wear-resistant metal or transparent plastics material as an integrated wire guide. The flyer bow has a profile (1a-1h) with a concave inner flank, a flat outer flank (5), and rounded transits (6',6") between them.

Description

The invention relates to a rotor bracket for Drahtverlitzungs- or Drahtverseilmaschinen.

In such machines known from the prior art, the separate wire strands provided on individual coils are first brought together, so that a bundle of several parallel wires is obtained. This bundle of parallel wires is then drawn along the inside flank of a stirrup rotating about a horizontally or vertically arranged axis (rotor hoop, often also referred to as a flyer bow). The rotation of the bracket, the originally parallel wires are twisted together when entering the bracket, and twisted when running off the bracket a further time with each other. The twisted wire running off the bracket is wound up on a spool. For productivity reasons, it is desirable to work with as high a rotational speed as possible. The rotor yokes are exposed to a strong load on the one hand by the centrifugal force and on the other hand by the friction of the wire, because by the centrifugal force during rotation of the wire strand is pressed according to a cable characteristic against the inner edge of the bracket.

It is known to manufacture rotor yokes for the machines described above from carbon fibers or glass fiber reinforced plastics (CFRP or GFRP). Originally, bars with a rectangular profile were used. However, streamlined (aerodynamic) profiles have been developed to reduce aerodynamic drag during rotation. For the guidance of the wires along the curvature of the bracket, a guide groove or groove lined with a metal sheet acting as wear protection, preferably made of a substantially abrasion-resistant hard metal, is embedded in the surface of the inner flank of the rotor bracket, and distributed over the length of the Drahtführungsnut are several Drahtführungsösen appropriate. Conventionally, these eyelets are screwed into the rotor yoke. Wire guidance over eyelets of the prior art has some significant disadvantages. Thus, the protruding from the inner edge of the rotor bracket eyelets disturb the aerodynamic shape of the rotor yoke, this leads to an increase in air resistance during rotation. The replacement of worn eyelets is relatively time-consuming, and the necessary for screwing the eyelets holes represent mechanical weaknesses of the rotor bracket. To overcome this disadvantage was in the patent US 6,289,661 proposed to form the eyelets for the wire guide so that they are attached to the rotor bracket and clasp it laterally. Another improvement is after US 5,809,763 in that instead of using semicircular eyelets with flattened circumference, which better adapt to the streamlined shaped profile of the rotor yoke.

Alternative solutions for wire guidance have also been proposed. For example disclosed US 6,223,513 a rotor bar with wing-shaped profile. This is traversed by a provided with a spring-loaded wire guide inner channel. The channel is enclosed by the (in relation to the axis of rotation) inner and the outer edge of the bracket and is in contact with the ambient air via a plurality of bores which traverse the inner or outer edge of the bracket. During the rotation of the rotor yoke, a pressure difference forms between its inner edge and its outer edge, therefore an air flow from the inner edge, at which the pressure is higher, flows through the holes on the inner edge into the wire guide channel and through the holes on the outer edge again out. As a result, the resulting in the wire guide channel material abrasion should be removed. The problem with this variant of rotor yokes is the relatively complicated shape with the channel lying in the interior. Such a rotor yoke can be made of two parts, which surround the wire guide channel and are connected to each other, but then the connecting seam is a potential weak point. If the rotor yoke, however, are made in one piece, so are relatively complicated molds with placeholders for the im Inside the workpiece lying wire guide channel required.

The patent EP 0 525 856 B1 also discloses a rotor yoke with airfoil-shaped profile. The rotor yoke consists of an inner core having a rectangular profile of a load-bearing material, eg carbon fibers, and a shell of a synthetic material extruded over this core, which does not necessarily have to be load-bearing. The jacket is designed to give the bow a wing-shaped profile. The wire is guided by a, in the axis of rotation facing the surface of the core embedded, coated with hard metal groove, which is covered by the core enclosing jacket. Preferably, a plurality of holes are provided in the portion of the shell covering the wire guide groove to facilitate insertion of the wire. In a first embodiment, the sheath is tightly and firmly on the surface of the core. However, a second embodiment is also disclosed which is intended to permit rapid replacement of the jacket. This unspecified variant is after FIG. 2 the patent mentioned so designed that the Mantle is wider than the dimensions of the rectangular core in the profile, so that the inside of the shell does not rest flat on the core, but it touches linear only at the edges. Certainly, in this less massive design, the sheath can easily be detached from the core, for example by cutting the sheath lengthwise and simply stripping it off laterally from the core. Thereafter, however, a new jacket would have to be extruded over the core, and this can not be done on-site at the wire manufacturer or processor because of the equipment needed for that purpose. Therefore, the replacement of worn sheaths or the renewal of the hard metal coating of Drahtführungsnut also appears relatively complex in this variant.

In the patent application WO 2004/011354 discloses a rotor yoke which allows a reduction in the frictional force between the yoke and wire passing thereover as well as a reduction in the tension on the wire. This is achieved by transporting the wire over an endless conveyor belt moved by a drive means. The conveyor belt moves along the inner edge of the rotor yoke in the wire running direction, is deflected at the front end of the rotor yoke in the wire running direction on a olle on the outer edge of the rotor yoke, runs along the outer edge of the otorbügel back and is there via another role back to the inner edge of the rotor yoke diverted. Along the outer edge of the rotor yoke, the conveyor belt is guided by eyelets, along the inner edge by a recessed channel, which is provided with a cover. The speed of the conveyor belt is adjusted to the speed of the wire passing over the rotor bar so as to avoid friction between the wire and the conveyor belt and reduce the wire tension. However, this great advantage is a relatively complex structure of the device and in operation additional control effort for the synchronization of the rotational speed of the conveyor belt with the wire speed compared.

From the document CH 618 486 is a Doppelschlagverilmaschine known whose shackle is equipped with a guide tube for the guidance of the cable, wherein the guide tube has a branch, to which a supply line for a fluid is connected. The fluid may be an emulsion of a liquid in air or in another gas or an airborne oil mist. The tube is received in a groove, which is incorporated in the inside of the sheet. The pipe can be fastened by clips in U-shape. The diameter of the guide tube is chosen so that the cable passes inside with sufficient clearance. Thanks to the fluid, the resistance exerted by the cable is reduced to a minimum. Next the reduction in motor torque and hence power consumption results in a reduction in abrasion wear on the outsides of the insulation of conductors and in the elongation to which the wires are subjected. The mixture of oil and air also causes the cooling of the cable and the discharge of dust and dirt that can be deposited on the cable.

The object of the present invention is to make the cross section of the groove (fillet), which receives the Drahtfühnmgsrohr so that the wire guide tube on the one hand easily bring into the groove and as possible also take out again, but on the other hand is held securely during the rotation process , The solution to the problem consists in the formation of the groove cross-section according to claim 1 or 2.

Further details, advantages and variants of the invention are explained in the following description and with reference to the figures.

Figur 1

verschiedene Profilgestaltungen des Rotorbügels mit eingelegter Drahtführungsröhre

Figur 2a und b

verschiedene Gestaltungen des Querschnitts der Nut für die Aufnahme der Drahtführungsröhre an einem beispielhaften Bügelprofil

Figur 3

einen Schnitt durch ein Mehrfach-Formwerkzeug für die simultane Herstellung mehrerer Rotorbügel

The figures show:

FIG. 1

various profile designs of the rotor bracket with inserted wire guide tube

FIGS. 2a and b

various configurations of the cross section of the groove for receiving the wire guide tube on an exemplary bracket profile

FIG. 3

a section through a multiple mold for the simultaneous production of multiple rotor yokes

The body of the rotor yoke, for example, made of carbon fibers or reinforced with glass fibers plastic. There are also known Rotorbügelkörper with a mixed structure of both materials. At the inner edge of the bracket, i. on the side facing the axis of rotation flank, a longitudinal groove for receiving the wire guide tube is centrally embedded. The wire guide tube used is a tube inserted in the groove, for example a metal tube, or a tube clamped in the groove, for example a transparent plastic tube. The inner diameter of the wire guide tube is suitably 1.5 to 28 mm.

The wire guide through a tube is not tied to a specific rotor yoke profile. When designing the profile of the rotor yoke different aspects have to be considered such as the air resistance, the minimum strength required for the strength of the material, the centrifugal forces occurring during the rotation, the embedding of the wire guide tube in the inner edge of the rotor yoke and a trouble-free wire guidance during the rotation.

With the known from the prior art airfoil-shaped profile can be minimized air resistance and thus save drive energy for the rotation. If the wire guide to be combined by a wire guide tube with an airfoil-shaped bracket profile, the groove to be provided for receiving the wire guide tube on the inner edge of the bracket is suitably designed so that the wire guide tube is largely sunk in the bracket surface to the aerodynamically optimized profile of the bracket not to interfere.

However, it has been found by the inventors that the high lift that forms on wing-shaped rotor yokes during rotation places a significant burden on the rotor

Bearings in which the rotor bracket is attached at its ends, causes. Therefore, it is desirable to find a compromise between aerodynamic drag and bearing load when designing the profile of the rotor yoke.

In FIG. 1 For example, some preferred profiles 1a to 1h of the Rotorbügelkörpes 1 are shown. The profiles 1a and 1b can be considered as a further development of the previously used rectangular profile, wherein the corners of the rectangle were rounded to reduce the air resistance. These curves are marked on the profiles 1a and 1b as 2 ', 2 ", 2''', 2 ''''.

In a further variant, the corners of the rectangle are chamfered, so that a profile 1c or 1d corresponding to a flattened octagon is obtained. The chamfers are in the profiles 1 c and 1 d as 3 ', 3 ", 3' '', 3" "marked.

In the inner, i. to the axis of rotation-facing edge 4 of the rotor yoke 1 is the center of the wire guide tube 7 is inserted.

However, the profiles 1e to 1h have proven to be particularly advantageous, whose flank 4, which is oriented towards the axis of rotation, has a convex curvature, while the outwardly facing flank 5 is flattened. The transitions 6 'and 6 "between the domed inner flank 4 and the flattened outer flank 5 are rounded to reduce drag, and such profiles have a negative buoyancy, unlike the airfoil-shaped profile of the beach of the art The profiles 1g and 1h are particularly preferred because the wire guide tube 7 here is almost completely submerged in the inner edge 4 and so in contrast to that from the surface of the Inner edge 4 outstanding wire guide tube 7 in the variants 1e and 1f hardly affects the aerodynamic behavior of the bracket.

A symmetrical profile of the rotor bracket according to the in FIG. 1 illustrated variants 1a to 1h is also advantageous in contrast to the airfoil-shaped profile, because its orientation when installed in the machine is independent of the direction of rotation. This avoids assembly errors.

For receiving the wire guide tube 7, a longitudinally extending groove is centrally provided on the inner edge 4 of the rotor yoke. It can be provided a groove which extends over the entire length of the inner temple edge 4 and opens at the ends of the bracket in the end faces in each case in an open cross-section. In another variant, the groove is designed so that it flattened towards the ends of the bow down to the height of the surface of the Ironing edge 4, so that the inserted wire guide tube 7 emerges at the flattened ends of the groove to the surface of the ironing inside edge 4. The emerging pipe ends are cut off so that the pipe mouths are flush with the surface of the inner edge 4.

The cross-section of the groove is designed so that the wire guide tube 7 on the one hand easily bring into the groove and as possible also take out again, but on the other hand is held securely during the rotation process. This can be achieved in different ways. For example, the groove can be designed so that its width W has a slight undersize relative to the outer dimensions of the tube or tube to be inserted. When pushing into the groove, the tube or hose is slightly compressed. When inserted, the tube or hose completely fills the space available in the groove, in turn presses against the wall of the groove and is held in this way. Alternatively, the groove can be designed so that its opening is narrower than the outer diameter of the tube to be inserted, but the groove cross-section widens away from the opening so far that it can receive the wire guide tube. In this arrangement, the wire guide tube is covered by the narrowing towards the opening groove cross-section and thus held in the groove.

In FIG. 2 By way of example, two embodiments 8 'and 8 "of the groove provided for receiving the wire guide tube are shown for the rotor yoke profiles 1a and 1b It should be noted, however, that the groove cross sections are not bound to this bracket profile, but rather these groove cross sections can be combined with any bracket profiles ,

In FIG. 2a a groove 8 'is provided with a U-shaped cross section whose width W is smaller than the outer dimensions of the tube or the tube in the non-pressed state. The cross-section of the tube or tube to be inserted into the U-shaped groove 8 'may be circular or oval, it is crucial that its outer dimensions are greater than the width W of the groove and that the tube or hose are deformable to the extent that they are press into the groove and adjust to its dimensions.

Another variant is accordingly FIG. 2b to provide a groove 8 "with a cross-section in the form of a truncated circle, wherein the diameter D of this circle corresponds to the outer diameter of the pipe to be taken in. By" truncated circle "is meant here the larger of the two parts of a circle formed by a chord in two Such a structure is bounded on the one hand by the straight line of the gate and on the other hand by a circular arc which sweeps over an angle of more than 180.degree .. The opening 9 of the groove 8 "is defined by the straight cut of the gate Circle is formed and is therefore narrower than the diameter D of the circle. Preferably, the groove 8 "is designed so that the circular arc describes an angle between 180.1 ° and 240 ° The opening 9 of the groove 8" is narrower than the diameter D of the circular arc, and consequently also narrower than the outer diameter of the tube to be inserted , From the opening 9 away, however, the cross section of the groove widens to the outer diameter of the male wire guide tube.

The existing of a slightly elastic material wire guide tube is pressed under narrowing through the narrow opening 9 in the groove 8 "in, so to speak clicked, but then widens back to its original diameter, so that it completely fills the groove and connects close to the wall If the "click" into the groove is not possible due to lack of elasticity of the tube material, the wire guide tube is threaded from one end of the bracket into the open end (the mouth) of the groove and then with a suitable guide tool fed lengthwise into the groove.

The inserted wire guide tube is covered by the opening towards the groove walls 10 ', 10 "and thus held in the groove.

A particular advantage of the invention is the relatively easy interchangeability of the wire guide tube subject to wear. This can be done in different ways depending on the design of the groove and handling of the hose or pipe material. For example, the hose can be gripped on its protruding from the groove wall with a suitable tool, such as a pair of pliers and compressed to a thickness which is smaller than the width of the groove, so that it can be removed from the groove. Another variant is to introduce a suitable lever tool between wire guide tube and groove wall, with this tool to underpin the wire guide tube and lift out of the groove.

Less easily deformable hoses or pipes or wire guide tubes buried very deep in the ironing surface can be pulled lengthwise through one of the open ends of the groove by means of a suitable tool which is inserted into an opening of the pipe and acts on its inner wall.

The essential criterion for the selection of the material of the wire guide tube is the wear resistance. It has been shown that in addition to pipes made of metallic materials Also hoses made of different plastics have a sufficient wear resistance for use as a wire guide tube.

Hoses or pipes are preferably used as wire guide tubes made of materials which have a slight plastic or elastic deformability, and taking advantage of this deformability in a groove which has a slight undersize compared to the outer dimensions of the wire guide tube to be inserted or an opening which is narrower than the outer diameter the wire guide tube, can be brought into. Particularly suitable for this purpose are flexible hoses whose cross-section is deformable and can thus adapt to the surrounding groove wall. Suitable hoses e.g. Plastic materials are commercially available from a variety of manufacturers.

In addition, the wire guide tube is preferably formed of a transparent material, such as a transparent, wear-resistant plastic. The transparent design of the wire guide tube facilitates process control and troubleshooting in the event of faults. Suitable materials for the production of such transparent tubes are, for example, polyethylene, polypropylene, polyoxymethylene and polyurethane.

Alternatively, tubes made of metal can be used, the advantage of which is higher abrasion resistance and therefore longer operating time.

The advantages of the rotor yoke according to the invention over the prior art consist in the reliable, durable bond between the rotor yoke and the wire guide tube with at the same time easy exchangeability of the wire guide tube.

A particular advantage of the continuous wire guide through a tube against a discontinuous wire guide through eyelets or the like. consists in the uniform load over the entire length of the wire. In the conventional wire guide through eyelets, the wire rests on the individual eyelets when starting up the stranding machine, before it is pressed against the inner flank of the rotor hoop during the stranding process due to the centrifugal force. At the points lying on the eyelets in each case the wire is more heavily loaded due to the friction on the eyelets than in the areas located between the eyelets. When guiding the wire through a tube, the wire rests on the wall of the wire guide tube 7 facing the axis of rotation when approaching over its entire length thereby evenly loaded before it is again pressed during the stranding process by the centrifugal force to the remote from the axis of rotation pipe wall.

In principle, all techniques which are suitable for the production of molded parts from fiber-reinforced composite materials can be used to manufacture the rotor bracket according to the invention. Preferably, such techniques are used, which allow near-net shape production. Thus, a better utilization of the relatively expensive fiber-reinforced composite material can be achieved compared to a material-removing shaping by working out the workpiece from a solid block of material. Typical techniques known to those skilled in the art include i.a. Hand lamination, compression molding and Resin Transfer Molding (RTM).

Preferably, a multiple mold 11 is correspondingly FIG. 3 uses comprehensively a lower tool 11 a with a plurality of cavities and a corresponding ram 11 b, so that a plurality of rotor yokes can be formed simultaneously with a pressure. The cavities reproduce exactly the contours of the rotor bracket to be produced, so that a final contact-type production takes place. In the in FIG. 3 exemplified tool for the production of rotor bars with the profile 1g is on the bottom of each cavity a bead 12 ', 12 ", 12''', 12 ''', whose cross section corresponds to the cross section of the groove on the inner edge of the rotor yoke, is provided These beads act as placeholders for the grooves Alternatively, a more simple shaped tool without the beads 12 ', 12 ", 12''', 12 '''' can be used with interchangeable inserts as placeholders for the grooves. Thus, by changing the inserts a tool for rotor yoke with different groove geometries can be used. The inserts can be made of metal, for example aluminum, or of a plastic which is stable under the conditions of the shaping process and does not connect to the plastic matrix of the CFRP or GFRP of the rotor bar body. Furthermore, for example, a hose filled with compressed air of suitable diameter can be used as a placeholder for the groove.

Finally, the wire guide tube itself can be inserted into the tool so that the rotor yoke is formed directly around the wire guide tube. In order to prevent the wire guide tube from being undesirably deformed during the molding process, it can also be stabilized by filling with compressed air. The aforementioned exemplary manufacturing methods are not limited to a specific bracket profile, they can also be applied, for example, for wing-shaped rotor yoke with wire guide tube. The cavities in the tool are then designed according to the desired bracket profile.

Claims (12)

1. A flyer bow for a wire stranding or cabling machine, in which flyer bow a longitudinally extending wire guiding tube (7) made of wear-resistant material is embedded centrally in a longitudinal groove (8') along the flyer bow's (1) flank (4) located on the inner side with respect to the rotational axis,
   characterized in
   that the width of the longitudinal groove (8') has an undersize with respect to the outer dimensions of the wire guiding tube (7) to be embedded in the longitudinal groove (8').
2. The flyer bow for a wire stranding or cabling machine, in which flyer bow a longitudinally extending wire guiding tube (7) made of wear-resistant material is embedded centrally in a longitudinal groove (8") along the flyer bow's (1) flank (4) located on the inner side with respect to the rotational axis,
   characterized in that
   the cross-section of the longitudinal groove (8") has the shape of a circle cut by a chord, the diameter (D) of which circle corresponds to the outer diameter of the wire guiding tube (7) to be inserted, wherein the arc of the cut circle comprises an angle between 180.1 and 240°, and the straight-cut section forms the opening (9) of the longitudinal groove (8") so that the inserted wire guiding tube (7) is engaged from behind with the groove walls (10', 10") projecting toward the opening.
3. The flyer bow according to claim 1 or claim 2, characterized in that the flyer bow body (1) consists of a plastic reinforced with glass fibers or carbon fibers or of a mixed structure of a plastic reinforced with carbon fibers and glass fibers.
4. The flyer bow according to claim 1 or claim 2, characterized in that the wire guiding tube (7) consists of metal or plastic.
5. The flyer bow according to claim 1 or claim 2, characterized in that the wire guiding tube (7) consists of a plastically or elastically deformable material.
6. The flyer bow according to claim 1 or claim 2, characterized in that the wire guiding tube (7) is formed by a plastic hose.
7. The flyer bow according to claim 1 or claim 2, characterized in that the wire guiding tube (7) consists of a transparent material.
8. The flyer bow according to claim 1 or claim 2, characterized in that the wire guiding tube (7) has an inner diameter between 1.5 and 28 mm.
9. The flyer bow according to claim 1 or claim 2, characterized in that the flyer bow (1) has a wing-shaped profile.
10. The flyer bow according to claim 1 or claim 2, characterized in that the flyer bow (1) has a profile in the form of a rectangle with rounded corners (1 a, 1 b) or of a flattened octagon (1 c, 1 d).
11. The flyer bow according to claim 1 or claim 2, characterized in that the flyer bow (1) has a profile (1e, 1f, 1g, 1h), the flank (4) of which located on the inner side with respect to the rotational axis has a convex curvature and the outer flank (5) of which is flat, wherein the transitions (6', 6") between the inner and the outer flank are rounded.
12. The flyer bow according to claim 1, characterized in that the longitudinal groove (8'), which is embedded on the flyer bow's inner flank (4) and the width (W) of which has an undersize with respect to the outer dimensions of the wire guiding tube (7) to be embedded in the longitudinal groove (8'), has a U-shaped cross-section.

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