WO2015082030A1 - Braiding or stranding machine having a rotor yoke and transport device - Google Patents

Abstract

A braiding or stranding machine for braiding or stranding a strand-shaped material (2) comprises a rotor yoke curved radially outward and rotatably around an axis of rotation, the two ends of which lie on or near the axis of rotation and the strand-shaped material (2) is moved along the longitudinal direction thereof during operation of the braiding or stranding machine. The rotor yoke comprises a transport device (1) for the strand-shaped material (2), which is equipped to contact the strand-shaped material (2) on only one part of the longitudinal extension of the rotor yoke and to move at the contact surface with the strand-shaped material (2) in the same direction as that of the strand-shaped material (2). In this way, the contact surface between the transport device (1) and the strand-shaped material (2), and thus the extension of the transport device (1) itself, can be reduced, by which means the aeroynamic drag of the transport device (1) also decreases.

Description

 Verlitz- or stranding machine with rotor bracket and transport device

Description

Hereby, the entire content of the priority application DE 20 2013 010 960.2 by reference is part of the present application.

The invention relates to a stranding or stranding machine for stranding stranded material. The strand-like material may be, for example, a metallic material such as a copper, steel or aluminum wire or a metallic conductor with different alloying components or a non-metallic material such as a natural or plastic fiber, wherein a plurality of strands of such a wire or such Fiber twisted together by twisting, d. H. to be processed into a stranded wire. However, the strand-like material may for example be such a strand, in which case several strands of such a strand also twisted together by twisting, d. H. be processed into a cable or a rope.

For the sake of simplicity, the invention will be described below with reference to a Verlitzmaschine. However, this is not a limitation. The invention can also be applied to a stranding machine.

In a Verlitzmaschine of the presently considered type, the stranding takes place by a rotating rotor, which usually has one or more radially outwardly curved rotor yoke, which at its two Axial ends are mounted on a single or multi-part rotor shaft and rotate about the axis of rotation of the rotor. At least two strands of the strand-like material (of the same or different type) are fed to the rotor and passed over a rotor yoke, whereby the strands are twisted.

The strand-like material is usually guided along the inside of one of the curved rotor yokes, for example, by passing it through a plurality of eyelets fastened at specific distances to this rotor yoke so that it does not slip off the rotating rotor yoke. Since the strand-like material is pressed by the centrifugal force against the inside of the rotor yoke, this is often provided with a friction and / or wear-reducing coating or insert, for example in the form of a slide made of hard metal.

The strand produced in the manner described is then removed again from the rotor yoke.

Both the strand-like material to be stranded and the strand made therefrom are provided to the Verlitzmaschine on coils or wound up again on a spool. In order to achieve different forms of twisting of the strand-like material, the coils for the strand-like material or the coil for the strand produced can either stand still or rotate at the same speed and in the same direction as the rotor. The coils can be arranged inside the Verlitzmaschine, in particular between the axial ends of the rotor, or outside the Verlitzmaschine. By means of various suitable arrangements of the coils, so-called single impact, double impact or other multiple impact Verlitzmaschinen can be realized.

The invention will be described below with reference to a Verlitzmaschine with a single rotor bracket. Again, this is not a limitation. The invention is also applicable to Verlitzmaschinen with multiple rotor hoops.

As described above, the strand-like material is pressed against the inside of the rotor yoke, resulting in increased sliding friction between the moving strand material and the rotor yoke. As a result, a tensile force acts on the strand-shaped material during the forwarding along the rotor yoke, which is opposite to the tensile force in the direction of propagation, which is generated, for example, by a rotating take-up reel for the stranded wire produced.

The resulting mechanical stress on the strand-like material can lead to quality problems in the strand produced. In particular, when the strand-like material is a wire, it may be solidified by the stress caused by the stress, and its elongation values may be deteriorated. This problem occurs especially at high speeds of the rotor yoke of the Verlitzmaschine. To solve this problem, transport devices for the strand-like material are proposed in the prior art. Under a transport device according to the present invention, a device is understood, which is arranged on or on the rotor yoke and adapted to touch the strand-like material and to move at the contact surface with the strand-like material in the same direction as the strand-like material. Rollers arranged on or on the rotor yoke, in particular deflection rollers, or combinations of such rollers are expressly not understood as such transport means.

WO 2004/01 1354 A2 proposes as a transport means a movable, driven by a drive mechanism conveyor strip, which is located in Moves longitudinally of the rotor yoke along the path of the strand material, with a speed which is preferably close to the speed at which the strand-like material moves along its path on the rotor yoke. The conveyor strip has the shape of a revolving endless belt, which runs on the inside of the rotor yoke in one direction and on the outside of the rotor yoke in the reverse direction and is thereby deflected and driven via two arranged at the outer ends of the rotor yoke guide rollers. Due to the approximately same speed of the strand-shaped material and the rotor yoke, the sliding friction between these two components and thus also the unwanted elongation of the strand-like material is largely eliminated.

The present invention is based on the object to provide an improved transport device for a stranding or stranding machine.

This object is achieved by a stranding or stranding machine according to claim 1. Further advantageous embodiments of the invention are contained in the dependent subclaims.

The invention relates to a Verlitzmaschine for stranding a strand-like material having a rotatable about a rotation axis, radially outwardly curved rotor yoke whose both ends are at or near the axis of rotation and along the longitudinal direction, the strand-shaped material moves during operation of the Verlitzmaschine, wherein the rotor yoke comprises a strand material transport means adapted to contact the strand material and to move at the interface with the strand material in the same direction as the strand material.

The invention is based on the recognition that a transport device for the strand-shaped material, in particular at higher rotational speeds of the rotor yoke can have a considerable air resistance. While the rotor bracket itself can be made sufficiently small and / or aerodynamic by a corresponding profiling in conjunction with a suitable material, the same can be achieved only with difficulty for the transport device, in particular for their moving parts. Increased air resistance of the rotor yoke, however, leads to greater heating, greater energy consumption, higher noise and a stronger vibration excitation of the Verlitzmaschine and should therefore be avoided. On the other hand, the load on the strand-like material is not uniform on its way along the radially outwardly curved rotor yoke. Rather, to the above-mentioned tensile force due to the friction between the strand-like material and the inside of the rotor yoke substantially on the seen in the direction of movement second half of the longitudinal extent of the rotor yoke still adds a component of the centrifugal force. This force component acts on the strand-like material on its way along the rotor yoke from a radially outward lying to a radially further inward point opposite to the direction of movement. As a result, the elongation of the strand-shaped material is enhanced. This effect is stronger, the greater the angle between the tangent of the rotor yoke at a certain point on the rotor yoke and the axis of rotation of the rotor yoke. By contrast, a component of the centrifugal force in the direction of movement of the strand-shaped material acts essentially on the first half of the longitudinal extent of the rotor yoke seen in the direction of movement, whereby the elongation of the strand-shaped material is reduced.

According to the invention it is therefore provided that the transport device is adapted to touch the strand-like material only on a part of the longitudinal extent of the rotor yoke. This part is smaller than the entire longitudinal extent of the rotor yoke. Thus, the contact surface between the transport device and the strand-like material and thus the extent of the transport device itself may be preferably limited to a region of the rotor yoke, in which the strand-like material is again used against the action of the centrifugal force radially inward in the direction of the axis of rotation.

Preferably, the transport device is adapted to continuously contact the strand-like material at least in the direction of movement of the strand-shaped material second half of the rotor yoke.

In contrast, in a region in which the strand-like material moves radially outward away from the axis of rotation and is even assisted by the centrifugal force, the transport device is not absolutely necessary. Such a region preferably includes at least a portion of the first half of the rotor yoke seen in the direction of movement of the strand material.

Depending on the structural boundary conditions of the Verlitzmaschine the proportion of the longitudinal extent of the rotor yoke, in which the transport means contacts the strand-like material, can be varied. Here, the specific advantages and disadvantages of the transport device in terms of their air resistance, their weight, etc., on the one hand and their quality-increasing effect on the stress of the strand-like material on the other hand be weighed against each other. The transport device is preferably set up to touch the strand-shaped material to 20 to 80%, more preferably to 30 to 70%, even more preferably to 40 to 60% of the longitudinal extent of the rotor yoke.

In a further preferred embodiment of the invention, the transport device is adapted to the strand-like material only on one side, in particular on a radially outer side, of the strand-like Touching materials. In this way, the force acting on the strand-like material centrifugal force can be targeted counteracted.

In a further preferred embodiment of the invention, the transport device is adapted to contact the strand-like material on at least two sides, in particular on a radially outer side and on a radially inner side, of the strand-like material. In this way, the strand-like material can be performed very safe and, for example, slippage of the strand material from the rotor yoke or its jamming with parts of the transport device can be prevented.

Of course, it is additionally possible to guide and thereby guide the strand material through eyelets secured to the rotor yoke, both in a part of the rotor yoke in which the transport means does not contact the strand material, and in a part of the rotor yoke in which the transport means contacts the strand-like material. In the latter part of the rotor yoke, the eyelets preferably have a sufficiently large diameter in order to pass both the strand-shaped material and the parts of the transport device, which are provided for contacting the strand-like material, through the eyelets.

In a further preferred embodiment of the invention, the transport device is arranged such that the parts of the transport device which are provided for contacting the strand-like material move during operation of the Verlitzmaschine substantially at the same speed as the strand-like material. Due to the low relative speed between these parts of the transport device and the strand-shaped material, the strand-shaped material can then be performed very secure. In a further particularly preferred embodiment of the invention, the transport device is a belt conveyor. Under a belt conveyor while a means for moving a strand-like material with a movable, in particular endless, flat, elongated conveying element, preferably a belt, a belt or a belt, understood, wherein the strand-like material and the surface of the conveying element aligned substantially parallel are and touch each other, so that the strand-like material is moved substantially by the static friction with the surface of the conveying element. The conveying element of the belt conveyor is preferably deflected at the two outer ends of the belt conveyor by a respective deflection roller.

In a further preferred embodiment of the invention, the rotor yoke is arranged with the transport device in a closed space which is filled with a medium having a density lower than the density of the ambient air. This medium is preferably air at a lower pressure than the ambient pressure or a gas at a lower density than air, preferably helium. In the case of air with a lower pressure than the ambient pressure, this is preferably generated by a vacuum pump.

By this medium, in turn, the disadvantage of increased air resistance of the transport device can be at least partially compensated. In this way, it may be practicable to arrange the transport device over a longer portion of the longitudinal extent of the rotor yoke than in a normal air density environment. The advantages and disadvantages of the transport device on the one hand and the effort to set up a closed space with a medium of lower density than the density of the ambient air can be weighed against each other in the construction of the Verlitzmaschine again.

In a further preferred embodiment of the invention, the rotor yoke in that part of its longitudinal extent in which the transport device is not is adapted to touch the strand-like material, preferably only in this part of the rotor yoke, a friction and / or wear-reducing coating or liner, in particular a diamond-like carbon coating, on.

As a result, the friction between the rotor yoke and the strand-like material is greatly reduced in this part of the rotor yoke. At the same time, the coating or insert can be limited to this part of the rotor yoke, thereby saving costs, design complexity and weight.

Diamond-like carbon is usually a mixture of sp ³ and sp ² -hybridized carbon with an amorphous structure, which has some of the typical properties of diamond Diamond-like carbon has very good friction and wear-reducing properties Therefore, this embodiment of the invention can preferably also be combined with the embodiment in which the rotor yoke is arranged in a closed space with a medium of lower density, in particular air with a lower air pressure.

Further advantageous embodiments of the invention are illustrated in the accompanying schematic drawings in conjunction with the following description. Showing:

1 shows a first embodiment of a one-sided transport device according to the invention;

2 shows a second embodiment of a two-sided transport device according to the invention;

3 shows a drive arrangement for a transport device according to the invention. Fig. 1 shows a transport device 1 according to the invention for a (not shown) radially outwardly curved rotor yoke. The rotor yoke may have Coriolis-cleaned sidewalls. Along the longitudinal extent of the rotor yoke, a wire 2 is moved in a direction 3.

The one-sided transport device 1 in the embodiment according to FIG. 1 extends along approximately two thirds of the longitudinal extent of the rotor yoke, namely, as seen in the direction of movement 3 of the wire 2, approximately from the end of the first third to the end of the rotor yoke.

On the rotor yoke, a plurality of guide rollers 5, a deflection and guide roller 8, a deflection and drive roller 7 and a tension roller 6 are rotatably mounted around which an endless belt 4 along the rotor yoke approximately at the same speed as the moving speed of the wire 2 rotates. The tension roller 6 is mounted transversely to its axis of rotation radially inwardly and outwardly displaceable and can thus be pressed against the endless belt 4 to tension it. The wire 2 is pressed by the centrifugal force from radially inward to the endless belt 4 and taken away from it by stiction. For this purpose, the wire 2 contacting side of the endless belt 4 may be provided with a friction-increasing coating. The endless belt 4 is a flat, flexible steel belt, and the rollers 5, 6, 7, 8 have smooth surfaces. However, the endless belt 4 may also be a toothed belt and the rollers 5, 6, 7, 8 may be corresponding toothed belt wheels, in which case the smooth, the tooth side facing away from the toothed belt points outwards and entrains the wire 2.

Fig. 2 shows a transport device 1 according to the invention, which has two separate, continuous endless belts 41, 42. The outer endless band 41 is guided over rollers 5, 6, 7, 8 on the outer side of the wire 2 as in the embodiment of FIG. The inner endless belt 42 is guided in mirror image to the outer endless belt 41 on the inner side of the wire 2 by corresponding rollers 5, 6, 7, 8.

2 begins, seen in the direction of movement 3 of the wire 2, just before half of the rotor yoke. The endless belts 41, 42 move at the same speed in the direction of movement 3 of the wire 2 and clamp the wire 2 between them from both sides so that the wire 2 inside the transporting device can no longer move to the side.

In order to achieve an exact guidance of the wire 2 on the endless belt 41 or on the endless belts 41 and 42, this or these can be provided, for example, with a circumferential groove in the longitudinal direction for receiving the wire 2.

Fig. 3 shows schematically a drive arrangement for a transport device according to the invention. Here, a ring gear 9 with the deflection and drive roller 7 coaxial and rigid. The ring gear 9 meshes with a drive pinion 10 and together with this forms a Hypoidgetriebe. The drive pinion 10 is in turn driven via a shaft and two intermeshing bevel gears 11 by a motor 12 which is arranged coaxially with the axis of rotation about which the rotor yoke rotates with the transport device 1. Due to the coaxial arrangement of the motor 12 with the axis of rotation can be an imbalance largely avoided by the relatively large mass of the motor 12. LIST OF REFERENCE NUMBERS

1 transport device

 2 wires

 3 direction of movement of the wire

 4 endless belt

 41 Outer endless belt

 42 Inner endless band

 5 leadership role

 6 tension roller

 7 deflection and drive roller

 8 deflecting and guiding roller

 9 ring gear

 10 drive pinions

 1 1 bevel gear

 12 engine

Claims

Patent claims Twisting or stranding machine for stranding or stranding a strand-shaped material (2), which has a rotor bracket that can be rotated about an axis of rotation and is curved radially outwards, the two ends of which lie on or near the axis of rotation and along the longitudinal direction of which the strand-shaped material (2) is located Operation of the stranding or stranding machine moves, the rotor bracket having a transport device (1) for the strand-shaped material (2), which is set up to touch the strand-shaped material (2) and is located on the contact surface with the strand-shaped material (2). in the same direction as the strand-shaped material (2), characterized in that the transport device (1) is set up to touch the strand-shaped material (2) only on part of the longitudinal extent of the rotor bow. Twisting or stranding machine according to claim 1, characterized in that the transport device (1) is set up to transport the strand-shaped material (2) at least in the direction of movement of the strand-shaped material (2) Seen to touch the second half of the rotor bracket continuously. 3. Twisting or stranding machine according to claim 1, characterized in that the transport device (1) is set up to touch the strand-shaped material (2) to 20 to 80% of the longitudinal extent of the rotor bracket. 4. Twisting or stranding machine according to one of the preceding claims, characterized in that the transport device (1) is set up to touch the strand-shaped material (2) to 30 to 70% of the longitudinal extent of the rotor bracket. 5. Twisting or stranding machine according to one of the preceding claims, characterized in that the transport device (1) is set up to touch the strand-shaped material (2) to 40 to 60% of the longitudinal extent of the rotor bracket. 6. Twisting or stranding machine according to one of the preceding claims, characterized in that the transport device (1) is set up to transport the strand-shaped material (2) only on one side, in particular on a radially outer side, of the strand-shaped material (2). to touch. 7. Twisting or stranding machine according to one of claims 1 to 5, characterized in that the transport device (1) is set up to transport the strand-shaped material (2) on at least two sides, in particular on a radially outer side and on a radially inner side lying side of the strand-shaped material (2). 8. Twisting or stranding machine according to one of the preceding claims, characterized in that the transport device (1) is set up so that the parts of the transport device (1) which are intended to touch the strand-shaped material (2) are in operation Move the stranding or stranding machine at essentially the same speed as the strand-shaped material (2). 9. Twisting or stranding machine according to one of the preceding claims, characterized in that the transport device (1) is a belt conveyor. Twisting or stranding machine according to one of the preceding claims, characterized in that the rotor bracket with the transport device (1) is arranged in a closed space which is filled with a medium with a lower density than the density of the ambient air. Twisting or stranding machine according to one of the preceding claims, characterized in that the rotor bow in that part of its longitudinal extent in which the transport device (1) is not set up to touch the strand-shaped material (2), preferably only in this part of the rotor bow , a friction and/or wear-reducing coating or insert, in particular a carbon-containing layer such as a diamond-like carbon coating.