EP2556518B1 - Flyer bow and method for the production thereof - Google Patents

Description

The present invention relates to a rotor yoke for a machine for processing elongated strand material, wherein the rotor yoke is designed such that it can be rotatably mounted in the machine and wherein the rotor yoke is used for twisting the strand material. Furthermore, the invention relates to a method for producing such a rotor yoke.

Machines with a rotatably mounted rotor bar for processing elongated extrudates are known from the prior art. Such machines are used for processing ladders, veins, threads or cords to cables or ropes and referred to as stranding or Verlitzmaschinen, in principle, a distinction is made between einschtagigen or doppelschlagigen machines. In the following, the invention will be described using the example of a Doppelschlagverlitzmaschine, but it should be noted that the invention also relates to all other types of machinery, in which a rotor yoke is used in the manner described.

All known Ausführungsfortnen of Doppelschlagverlitzmaschinen agree to the extent that the leadership of the elongated strand runs over a rotor or Verseilbügel that two Verlitzpunkte are provided and twice as many Verlitzschläge as Rotorbügelumdrehungen be generated. In this regard is on the EP 1 441 063 A1 and the WO 95/04185 directed.

The principle of operation of the double-twist machines described provides that the rotor yoke rotates about an axis. Double weft-stranding machines are mainly used for the production of mass-produced goods, such as electrical cables for the automotive industry, and accordingly have an extremely high processing speed. Along with this, the rotational speed of the rotor yoke is high and sometimes amounts to several thousand revolutions per minute.

Doppelschlagverlitzmaschinen are often involved in production lines, ie in the so-called in-line production. In this type of processing the Doppelschlagverlitzmaschine are before and / or downstream production steps for the production of the final product necessary. In the manufacture of an electric cable, for example, insulating the cable is downstream of the stranding. If only one link in the production chain fails during in-line production, the entire production line comes to a standstill and high downtime costs arise. Therefore, the reliability of a Doppelschlagverlitzmaschine extraordinary requirements.

So far rotatably mounted rotor yokes are used in Doppelschlagverlitzmaschinen, which often consist of a high-strength metallic material, or rotor yoke, which are designed as a very complex hollow body profile, as for example in the US 2006/0196163 A1 is disclosed. From the US 2006/0196163 A1 It is also known to manufacture rotor yokes, also as a solid profile, from a fiber reinforced composite material, such as carbon fiber reinforced plastic, with a plurality of individual wire guide liners held in line in a recessed channel in the rotor yoke.

From the US 3,945,182 a rotor yoke for a Verlitzmaschine is known with a longitudinal groove for guiding the strand material, which is preferably made of glass fiber fabric with epoxy resin in a vacuum container molding process.

Furthermore, from the US 5,809,763 a rotor bracket for a Verlitzmaschine with a wing profile in cross-section known, which is also made of a fiber-reinforced plastic.

The object of the invention is to provide a rotor yoke for a machine for processing elongated extrudates, wherein the rotor yoke is designed such that it can be rotatably mounted in the machine and wherein the rotor yoke is used for twisting the strand, which ensures the functional reliability of the machine increases as well as a method for producing a rotor yoke according to the invention.

This object is achieved by the processing of elongate extruded material wherein the rotor yoke is designed such that it can be rotatably mounted in the machine and wherein the rotor yoke for twisting the strand material according to claim 1 and by a method for producing such a rotor yoke according to claim 10 , The features of the dependent claims relate to preferred developments of the machine according to the invention.

The rotatably mounted rotor yoke serves to twist the strand material and extends starting from a cross-sectional area in the direction of a longitudinal axis. The rotor yoke extends at least partially bent in the direction of this longitudinal axis. The rotor yoke has in this direction a substantially perpendicular to this cross-sectional area extending longitudinal groove.

This longitudinal groove is at least partially covered by at least one guide element. In this rotor yoke, the extruded material is guided movably in the direction of the longitudinal axis.

The rotor yoke according to the invention consists essentially of plastic with fiber reinforcement.

The cross-sectional area of the rotor yoke is to be understood as an area which is arranged essentially perpendicular to the longitudinal axis of the rotor yoke and describes the cross section of the rotor yoke at least in sections. The rotor yoke extends at right angles to its cross-sectional area. The cross-sectional area may vary along the longitudinal axis of the rotor yoke.

A rotor yoke is to be understood as meaning an elongated, partially bent component. The bending of the rotor yoke may be caused by individual kinks, wherein the rotor yoke is straight or bent between two consecutive kinks. Under a kink is a bend with a relatively small bending radius, preferably r <100 mm to understand. The rotor yoke can have a continuous bend in one area in the direction of the longitudinal axis and run without bending in another area, in which case the radius of the bend can be variable. By the described shaping of the rotor yoke, the twisting of the elongated strand material is made possible. The rotor yoke is preferably rotatably mounted in the region of its ends and thus in particular rotatable about an axis of rotation.

A longitudinal groove is to be understood as meaning a recess in this rotor yoke which runs essentially in the direction of the longitudinal axis. The longitudinal groove is intended to guide the elongated strand material in the direction of the longitudinal axis of the rotor yoke.

A guide element is to be understood as meaning a component which at least partially covers this longitudinal groove. A guide element is provided to securely guide the elongate strand material in the longitudinal groove.

A plastic with fiber reinforcement is to be understood as meaning a material which has at least one proportion of matrix material and one portion of reinforcing fibers.

In this case, the reinforcing fibers of inorganic materials such as basalt, boron, glass, ceramic or silica; made of metallic materials such as steel, aluminum or titanium, as well as of metallic alloys; Made of natural materials such as wood, flax, hemp or sisal or preferably made of organic materials such as aramid, carbon, polyester, nylon, polyethylene or Plexiglas.

The reinforcing fibers used can have different fiber lengths. Preferably short fibers are used with a fiber length of 0.1 to 1 mm, these reinforcing fibers can be used advantageously in particular when the rotor yoke is produced in an injection molding process. Long fibers with a length of 1 mm to 50 mm are particularly preferably used, in particular in combination with a thermoset matrix material. Long fibers in particular lead to an increase in the strength and rigidity of the plastic with fiber reinforcement. Very particular preference is given to using continuous fibers having a length of more than 50 mm. continuous fibers are used in particular in the form of rovings or fabrics. A plastic with fiber reinforcement by continuous fibers meets the highest demands, in particular on the strength and rigidity.

By aligning the reinforcing fibers in the matrix material, in particular the deformation behavior and / or the strength of the plastic can be influenced with fiber reinforcement. The reinforcing fibers are preferably arranged randomly, multidirectionally in the matrix material. Thus, an almost uniformly rigid and / or solid plastic with fiber reinforcement results in almost all spatial directions. Preferably, the reinforcing fibers are aligned according to known stresses of the rotor yoke. This results in particular in a multidirectionally directed or preferably unidirectional orientation of the reinforcing fibers, so that the rotor hoop has a predeterminable deformation behavior in its main stress direction.

The matrix material of a fiber-reinforced plastic preferably has as a constituent a thermoplastic such as polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polysulfone (PSU), polyether imide (PEI) or polytetrafluoroethene (PTFE) or preferably a thermosetting plastic such as epoxy resin (EP), unsaturated polyester resin (UP), vinyl ester resin (VE), phenol-formaldehyde resin (PF), diallyl phthalate resin (DAP), methacrylate resin (MMA), polyurethane (PUR) or amino resin.

The volume fraction of reinforcing fibers to matrix material is preferably adapted to the expected stress and the allowable deformation of the rotor yoke. In particular, a high proportion of longer fibers leads to an increase in rigidity and strength. A fiber-reinforced plastic preferably has a fiber content of from 3 to 95% by volume, preferably from 60 to 80% by volume and particularly preferably from 65 to 70% by volume.

According to the invention the rotor yoke is designed as a solid profile, d. H. he has no closed cavities.

Furthermore, the cross-sectional area of the rotor yoke according to the invention has an elliptical basic shape.

In a preferred embodiment, the cross-sectional area of the rotor yoke has a first and a second axis. Preferably, these first and second axes are perpendicular to each other. Preferably, the cross-sectional area is substantially symmetrical with respect to the first axis and / or to the second axis. A rotor bracket according to the invention has essentially the same coefficient of air resistance due to its cross-sectional area, in particular in both directions at right angles to the direction of the longitudinal axis, and thus can be independent of the direction of rotation be used. As a result, the risk of errors when using the rotor yoke is lowered and thus in particular increases the reliability of Doppelschlagverlitzmaschine.

According to the invention, the rotor yoke has a longitudinal groove. The shape of this longitudinal groove is determined in part by a longitudinal groove cross-sectional area which is preferably in a common plane with the cross-sectional area of the rotor yoke. Starting from this longitudinal groove cross-sectional area, the longitudinal groove extends in the direction of the longitudinal axis of the rotor yoke. Preferably, the longitudinal groove cross-sectional area intersects the first axis of the cross-sectional area of the rotor yoke and in particular is symmetrical with respect to the second axis of this cross-sectional area. In particular, by this embodiment, the elongated extruded material is protected during the rotational movement, it is particularly exposed to external stresses, such as air currents, only slightly. Through this protection of the strand material, in particular the reliability of the Doppelschlagverlitzmaschine is increased.

In a preferred embodiment, the surface of this longitudinal groove at least partially on a coating. Preferably, the longitudinal groove is at least partially provided with a wear-reducing and / or friction-increasing coating. By increasing the friction to μ> 0.1 at the longitudinal groove surface is achieved in particular that on the surface of the longitudinal groove a sliding material can be secured against slipping. Due to the anti-slip fastening, in particular the functional reliability of the double-tucked glittering machine is increased. Preferably, the surface of the longitudinal groove is at least partially provided with a wear and / or friction-reducing coating. The friction-reducing coating achieves, in particular, that the elongate extruded material with a coefficient of friction of μ <0.1 can slide in the longitudinal groove. Due to this low coefficient of friction, the reliability of Doppelschlagverlitzmaschine is increased.

In a further preferred embodiment, the surface of the longitudinal groove is provided with no coating.

In another preferred embodiment, the surface of this longitudinal groove is provided with a sliding plate. In particular, the sliding plate consists of a friction and / or wear-reducing material. Preferably, this sliding plate lowers the coefficient of friction between the elongated extrudate and the sliding plate to μ <0.1.

Preferably, the sliding plate is made of a metallic material. By a sliding plate is in particular prevents that caused by the sliding of the elongated winding material wear damages the structure of the rotor yoke and thus reduces the component strength. By a sliding plate thus in particular the reliability of Doppelschlagverlitzmaschine is increased.

In a preferred embodiment, a Doppelschlagverlitzmaschine a rotor bracket with a guide element made of a wear and / or friction-reducing material. Preferably, this guide element is made of a metallic or preferably of a ceramic material. In particular, a guide element has at least a proportion of silicon carbide, preferably of aluminum oxide and particularly preferably of zirconium oxide. By a wear-resistant and friction-reducing guide element in particular the reliability of a Doppelschlagverlitzmaschine is increased because, in particular, the elongated Stranggut only slightly heated when sliding through the guide element. Another advantage of this embodiment over others is that the tow is less stressed and stretched.

In a preferred embodiment, a guide element with a fastening element on this rotor bracket is releasably attached. Preferably, the guide element is fastened by a pin, preferably by a rivet and more preferably by a screw. Preferably, a guide element is fastened with 1 to 4 fastening elements, preferably with 2 to 3 and particularly preferably with 2 fastening elements such as a screw connection. Due to the detachable connection between the guide element and the rotor yoke, the guide element can be easily and safely replaced and thus prevents this from being used despite heavy wear. As a result, the reliability of Doppelschlagverlitzmaschine is increased. In another embodiment of the invention, the guide element is integrally connected to the rotor yoke.

In a preferred embodiment, the guide element partially overlaps the longitudinal groove so that an overall cross-sectional area with a substantially closed strand guide recess arises in this covered area. By this expression of the strand guide recess can be prevented that the strand unscheduled leaking from the longitudinal groove. In particular, by the safe guidance of the strand in the longitudinal groove, the reliability of Doppelschlagverlitzmaschine is increased.

In a preferred embodiment, at least one of the attachment means does not protrude beyond the overall cross-sectional area. Preferably, a fastening means is introduced by the guide member in the rotor yoke and no longer protrudes beyond the attachment of the guide member beyond this. Preferably, the fastening element is a screw and the guide element has a recess for receiving a fastening means. The arrangement of the recess in the guide element of the rotor yoke is less weakened than in an arrangement of the recess in the rotor yoke. The rotor yoke thus has a less reduced component strength.

Preferably, a fastening means is inserted through the rotor bracket into the guide element and, after the fastening of the guide element has been completed, no longer projects beyond the rotor bracket. In a preferred embodiment, the fastening means is a screw and the rotor bracket has a recess for receiving the screw head and the guide element has a threaded portion. In particular, by the high strength of the guide element so creates a special viable screw connection and the reliability of Doppelschlagverlitzmaschine is increased.

In a further preferred embodiment, the guide elements are positioned so that the strand is deflected at least on two successive guide elements by the same angle, in particular to follow the course of the longitudinal groove. Preferably, a plurality of but at least two guide elements are claimed substantially equal by this type of attachment of the guide elements. Preferably, the same stress on identical guide elements causes a similar wear, so that inferred by the control of a guide element on the state of wear of several guide elements and thus their replacement can be simplified. In particular, by the simplified replacement of the guide elements, the reliability of Doppelschlagverlitzmaschine is increased. By this type of positioning of the guide elements, it is possible to use fewer guide elements, thereby reducing the number of wear parts on the one hand, on the other hand extends the free, not covered route between the guide elements. When the elongated strand material slides through the longitudinal groove and / or through a guide element, particles can detach from the extruded material and / or from the sliding surfaces and deposit on the rotor yoke, in particular copper or tin dust deposits on the rotor yoke. The air flow generated by the rotational movement can in advantageously remove these particles on the free uncovered sections of the rotor yoke. Thus, the functional reliability of the Doppelschlagverlitzmaschine is increased by the described type of positioning of the guide elements.

In a method according to the invention for producing a rotor yoke, in particular for use in a double-twist extruder, a rotor yoke according to the invention is first produced from a plastic, in particular with fiber reinforcement, on which a guide element is subsequently attached.

In a preferred embodiment of the production method, this has in particular the steps of prototyping and curing or cooling of this rotor yoke. In particular, under prototypes is the introduction of plastic with fiber reinforcement in a mold, which is preferably substantially a negative form of the rotor yoke to understand. Preferably, the matrix material and the reinforcing fibers are introduced together, in particular by injection molding, in the negative mold. The matrix material and the reinforcing fibers are preferably introduced into the negative mold separately from one another.

By hardening or cooling, it is to be understood that the rotor yoke has substantially the desired mechanical properties, in particular with regard to its rigidity and strength, especially after completion of this process.

By attaching a guide element is to be understood that this is positively connected to the rotor bracket, for example by a fastener or that this is materially connected to the rotor yoke. Preferably, a fastener is a rivet or a screw to understand. Preferably, a guide element is fastened with two fastening elements on the rotor yoke, particularly preferably with two screws.

Fig. 1

einen Rotorbügel 1 zum Einsatz in einer Doppelschlag-Verlitzmaschine, wobei dieser einige Führungselemente 2 aufweist,

Fig. 2

die Querschnittsfläche 4 eines Rotorbügels 1 mit einer ersten Achse 5 und einer zweiten Achse 6,

Fig. 3

die Gesamtquerschnittsfläche 4 mit einer Stranggutführungs-Ausnehmung 6, wobei der Längsrillen-Querschnitt 10 ein Teil dieser ist und zwei Befestigungselemente 15.

Further advantages, features and applications of the present invention will become apparent from the following description taken in conjunction with the figures. It shows:

Fig. 1

a rotor yoke 1 for use in a double-stroke Verlitzmaschine, wherein this has some guide elements 2,

Fig. 2

the cross-sectional area 4 of a rotor yoke 1 with a first axis 5 and a second axis 6,

Fig. 3

the total cross-sectional area 4 with a strand guide recess 6, wherein the longitudinal groove cross-section 10 is a part of this and two fastening elements 15th

In Fig. 1 a rotor yoke 1 for use in a Doppelschlagberützmaschine is shown. On the rotor bracket 1 guide elements 2 are attached. The rotor yoke 1 extends in the direction of the longitudinal axis 3, at right angles to its cross-sectional area 4 (not shown) and has a bend in the middle region. The rotor yoke 1 is rotatably mounted in the region of its ends 14 and can rotate about the axis of rotation 13.

In Fig. 2 is the cross-sectional area 4 of the rotor yoke 1 shown. The cross-sectional area 4 has a first axis 5 and a second axis 6. For these two axes 5 and 6, the cross-sectional area 4 is symmetrical. The illustrated cross-sectional area 4 essentially has an elliptical basic shape. As can be seen from the cross-sectional area 4, the rotor yoke 1 is designed as a solid-body profile, ie it has no closed cavities.

In Fig. 3 is the total cross-sectional area of the rotor yoke shown, which is composed of the cross-sectional area 4 of the rotor yoke and the cross-sectional area of the guide element 2. The guide element 2 covers in the plane shown the longitudinal groove cross-sectional area 10, so that a closed strand guide recess 12 is formed. The surface of the longitudinal groove 11 is partially covered with a sliding plate 8. The guide element 2 has two threaded portions 7 for receiving the fastening screws 15. The fastening screws 15 are inserted through the rotor yoke 1 in the guide element 2 and connected thereto, while the heads of the fastening screws 15 are substantially received in recesses 9 in the rotor yoke 1. The Längsrülen cross-sectional area 10 intersects the first axis 5 and is symmetrical to the second axis 6. By this expression of the longitudinal groove cross-sectional area 10 is the strand material (not shown) in the rotational movement well protected from external influences, such as air currents, in the longitudinal groove.

Claims (11)

1. A rotor bow (1) for a machine for processing elongate strand stock,
   wherein the rotor bow (1) is constructed such that it can be rotatably mounted in the machine, and wherein rotor bow (1) serves to twist the strand stock, with:

   an extension substantially along a longitudinal axis (3), at least sections of which are curved;

   a cross-section described by a cross-sectional area (4) and extending substantially right-angled to the longitudinal axis (3);

   a longitudinal groove extending substantially parallel to the longitudinal axis (3) and having its cross-section described by a longitudinal groove cross-sectional area (10), wherein the strand stock can be movably guided in the direction of the longitudinal axis (3) in said longitudinal groove of the rotor bow (1);

   wherein the rotor bow (1) consists of plastic reinforced with fibers and is formed as a solid body profile, characterized in that at least one guide element (2) is provided which covers at least portions of said longitudinal groove and which is adapted for guiding the strand stock;
   and that said cross-sectional area (4) has an elliptical basic form.
2. The rotor bow (1) according to claim 1, characterized in that portions of the longitudinal groove cross-sectional area (10) are intersected by a first semi-axis (5) of the elliptical basic form and is in particular symmetrical to a second semi-axis (6) of the elliptical basic form.
3. The rotor bow (1) according to one of the preceding claims, characterized in that at least portions of the surface (11) of the longitudinal groove are provided with a coating, wherein said coating is composed of a wear-reducing and/or friction-reducing material.
4. The rotor bow (1) according to claim 1 or 2, characterized in that at least portions of the surface (11) of the longitudinal groove are provided with a slide plate (8), wherein at least sections of same consist of a wear-reducing and/or friction-reducing material.
5. The rotor bow (1) according to one of the preceding claims, characterized in that at least sections of the at least one guide element (2) consists of a wear-reducing and/or friction-reducing material, particularly a ceramic material.
6. The rotor bow (1) according to one of the preceding claims, characterized in that the at least one guide element (2) is detachably affixed on the rotor bow (1) by means of at least one fixing element (15).
7. The rotor bow (1) according to claim 6, characterized in that a total cross-sectional area having a circumferentially closed strand stock guiding recess (12) is formed in the covered area.
8. The rotor bow (1) according to claim 6 or 7, characterized in that the at least one fixing element (15) is substantially disposed within the total cross-sectional area.
9. The rotor bow (1) according to one of the preceding claims, characterized in that the rotor bow (1) has at least two guide elements (2) which are positioned such that the angle of deflection by which the strand stock is deflected at a guide element (2), particularly in order to follow the path of the longitudinal groove, is the same at two consecutive guide elements (2).
10. A method of manufacturing a rotor bow (1) according to one of claims 1 to 9 for a rotatably mounting in a machine for processing elongate strand stock, wherein
    the rotor bow (1), which serves to twist the strand stock, comprises:

    an extension substantially along a longitudinal axis (3), at least sections of which are curved;

    a cross-section described by a cross-sectional area (4) and extending substantially right-angled to the longitudinal axis (3);

    a longitudinal groove extending substantially parallel to the longitudinal axis (3) and having its cross-section described by a longitudinal groove cross-sectional area (10), wherein the strand stock can be movably guided in the direction of the longitudinal axis (3) in said longitudinal groove of the rotor bow (1);

    at least one guide element (2) which covers at least portions of said longitudinal groove and which is adapted for guiding the strand stock;

    wherein the rotor bow (1) with the longitudinal groove is manufactured from plastic reinforced with fibers as a solid body profile, wherein the cross-sectional area (4) has an elliptical basic form, and wherein the at least one guiding element (2) is connected to the rotor bow (1).
11. A machine for processing elongate strand stock comprising a rotor bow (1) according to at least one of the claims 1 to 9.

Images