EP2931967A2

EP2931967A2 - Braiding or stranding machine

Info

Publication number: EP2931967A2
Application number: EP13810889.9A
Authority: EP
Inventors: Hubert Reinisch
Original assignee: Maschinenfabrik Niehoff GmbH and Co KG
Current assignee: Maschinenfabrik Niehoff GmbH and Co KG
Priority date: 2012-12-11
Filing date: 2013-12-09
Publication date: 2015-10-21
Also published as: BR112015011984A2; WO2014090391A2; US20150275426A1; JP2016503839A; CN104769180A; DE102012024232A1; RU2015119540A; MX2015007059A; WO2014090391A3

Abstract

The invention relates to a braiding or stranding machine 1 for braiding or stranding a cord-shaped material, for example a wire, having a rotor which is mounted on a single or multiple part rotor shaft 5, 6, 22, which is driven by at least one motor 8, 8a, 8b. The braiding or stranding machine 1 is arranged at least partially in an enclosed space 2 which is filled with a medium with a density less than the density of the ambient air. Because of the lesser air resistance on the rotor, this leads to a lower energy consumption, less noise development and a lower excitement of vibrations. According to the invention, the rotor shaft 5, 6, 22 is arranged fully inside the envelope 3 of the enclosed space 2 or the rotor shaft 5, 6 has at least one section of a smaller diameter and at least one section of a larger diameter and only penetrates the envelope 3 of the enclosed space 2 in the at least one section of smaller diameter. This means that air seals 14 with parts in contact with each other and rotating contrary to each other are avoided - at least those of large diameters, or even at all - as is the development of heat particularly at high rotational speeds associated with such seals and the high wear of such seals 14.

Description

Verlitz- or stranding machine

Description

Hereby, the entire content of the priority application DE 10 2012 024 232.8 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, in which case several strands of such a fiber by twisting together heels, 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 Verlitzma- machine. 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 rotor yokes, which are mounted at its two axial ends on a single or multi-part rotor shaft. The rotor will be at least two Strands of the strand-like material (the same or different type) fed and passed over a rotor yoke, whereby a twisting of the strands takes place. The strand made in this way is then removed again from the rotor yoke.

Both the strand-like material to be stranded and the strand produced therefrom are provided to the Verlitzmaschine on coils or wound on a reel. In order to achieve different forms of twisting of the strand-like material, the spools for the strand-like material or the spool 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 a suitable arrangement 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 double-twist Verlitzmaschine with a single rotor bracket, in which the coils for the strand-like material outside the machine are arranged stationary and the coil for the strand produced within the machine is mounted on the rotor and not with this rotates. Again, this is not a limitation. The invention is also applicable to Verlitzmaschinen with other coil and / or Rotorbügelanordnungen.

In conventional Verlitzmaschinen the Rotorbügel rotates at high speed within the existing even in the interior of the machine ambient air. The rotor and possibly also the strand-shaped material - if this does not run inside the rotor yoke or in a tube - must therefore constantly overcome the air resistance. The mechanical power required for this depends u. A. from the density of the air and the web speed of the rotor yoke, the power increases quadratically with the speed. Therefore, high require Verlitzgeschwindigkeiten and thus high speeds of the rotor yoke also a correspondingly high performance, which is converted to a large extent in frictional heat due to air friction and consuming must be removed from the Verlitzmaschine. Increases in productivity can therefore only be achieved with great effort.

Another problem with high rotor speeds are increased noise emissions and a stronger vibration excitation of the rotor yoke, which has its cause in that during the rotation of the rotor yoke, the flow boundary conditions between the rotor yoke and adjacent machine parts change periodically.

In order to avoid these problems, in particular the generation of heat and noise during the operation of a Verlitzmaschine, DE 22 41 826 proposes to carry out at least a part of the Verlitzvorgangs within a closed space in which at least a partial vacuum has been generated. Due to the reduced air friction less noise and less frictional heat are generated in the partial vacuum through the rotor yoke. Likewise, the reduced air resistance leads to a lower energy consumption of the extrusion machine.

For economic reasons, DE 22 41 826 envisages only to arrange certain parts of the Verlitzmaschine in a substantially hermetically sealed space has been deducted from the air. In the exemplary embodiments, the two outer sections of the rotor shaft with the rotary heads arranged thereon are mounted in end openings of a cylindrical, airtight housing, wherein the airtightness is produced at these points by annular air seals. The present invention is based on the object to provide an improved Verlitzmaschine with low energy consumption, low noise and low vibration excitation. This object is achieved by a Verlitzmaschine according to claim 1. Further advantageous embodiments of the invention are contained in the subclaims.

The invention is based on the recognition that the annular air seals used in the prior art, with which the shaft sections are sealed to the housing and which have contacting and rotating parts, can become very hot at high rotor speeds, thereby resulting in faster wear and tear whereby the operating personnel of the Verlitzmaschine is exposed to a risk of burns when touching the seals. In addition, the resulting friction energy and is therefore not economical. "Non-contact" sealing systems, however, are expensive.

Furthermore, the heat development caused by such an air seal and its wear increase with the diameter of the air seal, as it also increases the peripheral speed at the outer edge of the rotating part, so that the relative speed of the parts of the air seal against each other and thus the resulting frictional heat.

In a Verlitzmaschine invention, at least such air seals with large diameters or even such air seals can be avoided at all.

The invention is based on a stranding machine for stranding a strand-like material, which has a rotor with a one-part or multi-part rotor shaft, which is driven by at least one motor, wherein the Verlitzmaschine is at least partially arranged in a closed space, the is filled with a medium having a density lower than the density of the ambient air. In such a Verlitzmaschine invention provides that the rotor shaft is disposed entirely within the enclosure of the enclosed space or that the rotor shaft has at least a portion of smaller diameter and at least a portion of larger diameter and the enclosure of the enclosed space only in the at least one section of smaller diameter penetrates.

In this way, air seals with touching and rotating parts with large diameters and the resulting high heat development and the great wear of the air seals during operation of the Verlitzmaschine can be avoided.

In particular, it is therefore provided in a Verlitzmaschine invention that the rotor shaft does not penetrate the enclosure of the enclosed space at a point at which the rotor shaft has its largest diameter.

In a particularly preferred embodiment of the invention, the rotor shaft does not penetrate the enclosure of the enclosed space at all. Thus, the problems mentioned with the air seals at least with respect to the rotor shaft are completely avoided.

In a further particularly preferred embodiment of the invention, the Verlitzmaschine has no seals for sealing the closed space relative to the environment with touching and against each other rotating parts. In this case, the aforementioned problems with such seals for the entire Verlitzmaschine be completely avoided.

The following sets out a number of constructive measures that can be taken to achieve these objectives: In a particularly preferred embodiment of the invention, the rotary drive of the rotor takes place only at one axial end of the rotor. As a result, a drive at the other axial end of the rotor, in particular a motor and / or a torque transmission device, saved. The waiver of a two-sided drive of the rotor is made possible by the fact that the rotor yoke can be designed with a larger cross-section because of the lower air resistance without this leading to a significant increase in the energy consumption of the Verlitzmaschine. The rotational movement of the non-driven axial end of the rotor is then transmitted via the - correspondingly more stable - rotor bracket itself.

In this embodiment of the invention, the rotor preferably has at least one rotor yoke, which is reinforced in the region of at least one of its axial ends with respect to its central region, in particular by an enlargement of its cross section. As a result, the rotor yoke is selectively reinforced at those points where it is loaded by the largest torque.

Preferably, in this embodiment of the invention, the rotor has at least two rotor yokes. This results in a distribution of the torque occurring during operation to a plurality of preferably identical components. The at least two rotor yokes are preferably arranged with respect to the axis of rotation of the rotor at equal angular intervals to each other, d. h., If, for example, exactly two rotor yokes are provided, they are diametrically opposite with respect to the axis of rotation of the rotor. Again, there is not a significant increase in the energy consumption of the Verlitzmaschine due to the reduced air resistance.

In a further preferred embodiment of the invention, the rotor shaft is driven at both axial ends of the rotor by a respective motor. As a result, a uniform drive of the entire rotor can be achieved without the two axial ends of the motor must be connected by moving parts. In a further preferred embodiment of the invention, the rotor shaft is driven by exactly one motor, the motor being coupled to the two axial ends of the rotor by mechanical torque transfer means and the drive acting on both axial ends of the rotor shaft, the mechanical torque transfer means being wholly or partially engaged partially disposed within the enclosed space. As a result, a speed-synchronized drive of the rotor shaft at its two axial ends can be achieved with simple means. At the same time, the arrangement of the mechanical torque transmission means makes it possible to dispense, in whole or in part, with further air seals with parts which touch and rotate with respect to one another, in particular with such air seals with large diameters. In a preferred variant of this embodiment of the invention, the mechanical torque transmission means comprise at least one toothed belt and / or at least one shaft. As a result, a slip-free torque transmission and thus a speed-synchronized drive of the rotor shaft at its two axial ends can be realized in a simple manner.

In a further preferred embodiment of the invention, the geometric axes of the drive shaft of the at least one motor and the rotor shaft coincide. In this arrangement, the drive shaft of the motor and the rotor shaft can be rigid or connected via a possibly flexible intermediate piece or even made in one piece, whereby further mechanical drive elements are largely superfluous.

In a preferred variant of this embodiment of the invention, the at least one motor has a hollow shaft, wherein the stator of the motor is preferably carried out integrated into the housing, or the motor is flanged to the housing supporting the rotor shaft. In both cases results in a compact and stable arrangement of the motor and an equally compact and stable connection with the rotor shaft.

The medium with a density lower than the density of the ambient air with which the closed space is filled can be produced in various ways:

Preferably, this medium is air with a lower density than the density of the ambient air. This is preferably generated by a vacuum pump, which sucks air from the enclosed space and thus generates at least a partial vacuum there. Even taking into account the energy requirement of the vacuum pump, this results overall in a significant energy saving due to the reduced air resistance of the rotor yoke, resulting in a lower energy loss due to frictional heat.

The medium may also be a gas which has a lower density than air at the same pressure and temperature. In particular, this helium is suitable, which has only a density of 0.1785 kg / m ³ , in contrast to air with a density of 1, 293 kg / m ³ , in each case under standard conditions (0 ° C and atmospheric pressure) measured. For this purpose, for example, contaminated helium, which can no longer be used for other technical processes, for example in the semiconductor sector, and therefore is available at low cost, is sufficient. Of course, both media can be combined, that is, for example, a helium-air mixture can be used, or it can be metered in a partial vacuum in the closed space, for example, helium. The enclosed space can have different dimensions and thus also include a different number of components of the Verlitzmaschine: In a preferred embodiment of the invention, the enclosed space extends substantially only around the rotor. As a result, the volume to be evacuated can be kept particularly small. In a further preferred embodiment of the invention, the enclosed space extends substantially around the entire Verlitzmaschine around. Its enclosure may preferably be identical to the machine housing, the machine housing being sealed airtight. As a result, then no obstructions arise through the enclosure of the enclosed space when loading and unloading the Verlitzmaschine.

Along with the advantages already mentioned, such as energy savings, lower noise development and lower vibration excitation, the stranding machine according to the invention can also be operated at relatively high rotational speeds and thus at higher feed rates of the strand-like material. In particular, the lower vibration excitation and thus the smoother running of the rotor bracket also lead to an improved quality of the strand produced. Further advantageous embodiments of the invention are illustrated in the accompanying, partially schematic drawings in conjunction with the following description. Showing:

1 shows a first embodiment of a Verlitzmaschine invention with two concentric with the rotor shaft arranged motors.

2 shows a second embodiment of a Verlitzmaschine invention with a concentric with the rotor shaft and a parallel to the rotor shaft arranged motor.

3 shows a third embodiment of a Verlitzmaschine invention with a motor which drives both axial ends of the rotor shaft. 4 shows a fourth embodiment of a Verlitzmaschine invention with a motor which drives only one axial end of the rotor shaft; Fig. 5: a modification of the embodiment of FIG. 4;

Fig. 6: a rotor bracket of the prior art and a rotor bracket according to the invention in a development. In a wire stranding machine according to the invention as shown in FIG. 1 with a machine housing or a machine stand 7, several wires are unwound from a respective spool (not shown) and introduced into a wire bore 12 in a central bore of an inlet-side section 5 of a rotor shaft into the machine. The wires run in the bore until shortly before the other end of the inlet-side rotor shaft section 5, where they are led out through an opening from the rotor shaft and passed over a deflection roller 15 on a curved rotor bracket 4. The wiring of the wires by twisting together takes place inter alia in the axial bore of the inlet-side section 5 of the rotor shaft.

On the inlet-side end of the inlet-side section 5 of the rotor shaft, an electric transmission unit 21 is furthermore arranged. This serves to transmit electrical energy to the rotating parts of the rotor, for example for driving a take-up reel (not shown). The current is transmitted via slip rings with carbon brushes.

The rotor yoke 4 rotates about the axis of the rotor shaft 5, 6 and takes along the stranded wire, which is pressed by the centrifugal force against the inside of the rotor yoke 4 and guided there for example by a guide groove and by eye-shaped guide elements (not shown) on the rotor yoke 4th is held. The opposite end of the rotor yoke 4 is mounted on the deflection-side section 6 of the rotor shaft. The sections 5 and 6 of the rotor shaft are each rotatably supported by one or more bearings 20, preferably roller bearings, relative to the machine housing 7. The two sections 5 and 6 of the rotor shaft are not rigid, but only connected to each other via the partially flexible rotor yoke 4.

The stranded wire is fed to the deflection-side section 6 of the rotor shaft via a deflection roller 16, which is rotatably mounted on the deflection-side section 6 of the rotor shaft, a take-up reel (not shown). Once the take-up reel is filled, the machine housing 7 is opened and the full take-up reel replaced with an empty reel.

Furthermore, the entire Drahtverlitzmaschine 1 in a soundproof cabin (not shown) may be arranged.

In the illustrated wire-stranding machine 1 is a so-called double-beat Verlitzmaschine. The structure of the wire-stranding machine 1 described hitherto is also substantially the same in all of the exemplary embodiments described below and will not be described again there as far as no changes are made with respect to this structure. In principle, it is also possible to apply the invention to Verlitzmaschinen with other designs. In addition, of course, features of various embodiments described below - as far as technically possible - can be combined.

Likewise, the rotor of the wire-stranding machine 1, which essentially has the sections 5 and 6 of the rotor shaft and the rotor yoke 4, is arranged in all the embodiments described below in a closed space 2 in which a partial vacuum has been produced by a vacuum pump (not shown) , As already described above, resulting from the lower air friction between the very fast, for example, with 4500 revolutions per minute, rotating stirrups 4 and the remaining air in the closed space 2 less heat and noise and a lower vibration excitation and thus smoother running of the rotor yoke 4. As also described above, the same advantages can also be obtained by dosing a gas of lower density than air, such as helium, or by a mixture of air and such a gas. Due to the lower noise may possibly be completely dispensed with the aforementioned soundproof cabin.

In the embodiment of Fig. 1, the upstream side portion 5 and the deflecting side portion 6 of the rotor shaft are each driven by a separate motor 8a, 8b, the stator units 9a, 9b of the motors 8a, 8b being integrated into the machine housing 7 and the rotor units 10a , 10b of the motors 8a, 8b are concentrically and rigidly connected to the respective rotor shaft section 5, 6. The motors 8a, 8b are housing-integrated hollow shaft motors in whose motor shafts the respective section 5, 6 of the rotor shaft can be inserted.

Alternatively, they may also be motors 8a, 8b, which consist of mounting kits, wherein the stator units 9a, 9b and the rotor units 10a, 10b are supplied as separate parts. In this case, the rotor units 10a, 10b are first pushed onto the sections 5, 6 of the rotor shaft and then mounted together with these in the machine housing 7 with the stator units 9a, 9b.

Because of the lack of mechanical coupling between the rotor shaft sections 5, 6 or between the two motors 8a, 8b, the two motors 8a, 8b, for example, by a common control electronics must be exactly synchronized speed in this embodiment, to a To avoid excessive load or even damage to the rotor yoke 4 as a result of different speeds.

The use of two separate motors 8a, 8b for the two sections 5, 6 of the rotor shaft requires no further mechanical components for driving the rotor shaft. In particular, the rotor shaft is arranged with their areas of greatest diameter within the closed space 2, so that no air seals with large diameters between the closed space 2 and the environment at the implementation sites of the rotor shaft are needed.

Only at the inlet end of the inlet-side section 5 of the rotor shaft, an air seal 14 is provided, with which the implementation site of this rotor shaft section 5 is sealed by the enclosure 3 of the closed space 2. The air seal 14 has a fixed outer and an inner part rotating with the rotor shaft, which abut each other for the purpose of sealing. However, the portion of the rotor shaft in the region of the air seal 14 only serves to supply the wire and can have a correspondingly small diameter. As a result, the air seal 14 has only a small diameter and generates accordingly little friction heat.

Alternatively, it is also possible to dispense altogether on the outermost portion of smaller diameter of the rotor shaft protruding from the closed space 2 and to allow the rotor shaft to end inside the enclosed space 2 at the point of its diameter increase. The wires are introduced in this case by a fixed die and / or a sleeve in the closed space 2 and passed only in the interior of the rotor shaft, which can be completely dispensed with the air seal 14 with mutually movable parts. The die and / or the sleeve should have the largest possible length and at the same time the smallest possible gap in the bore for the gap around the wire around. Thereby, the flow resistance for the misaligned air in the gap becomes so great that the vacuum pump can compensate for an increase in the pressure in the closed space 2 by the inflowing air that enters through the "leak" caused by the sleeve.

Of course, at the wire inlet 13 and a spatially fixed, not co-rotating wire feedthrough, as shown in Fig. 4, with the machine versions of FIG. 1 to 3 are combined. 2 differs from that of FIG. 1 only by the drive of the two rotor shaft sections 5, 6. Again, the rotor shaft sections 5, 6 driven by two separate motors 8 a, 8 b, which, however, as a separate , in each case encapsulated in a separate housing components are arranged in the closed space 2 and fixed to the machine housing or stand 7.

The drive motor 8b for the deflection-side section 6 of the rotor shaft is flanged to the deflection-side end face of the machine housing 7 such that its shaft 11b engages concentrically in the deflection-side section 6 of the rotor shaft. By contrast, the drive motor 8a for the inlet-side section 5 of the rotor shaft is fastened to the machine stand 7 in such a way that its shaft 11a runs parallel to the rotor shaft. The torque transmission between the motor 8a and the inlet-side section 5 of the rotor shaft takes place via a toothed belt drive with two toothed belt pulleys 17a and a toothed belt 18a. Both motors 8a and 8b are completely disposed in the closed space 2. Again, the two motors 8a and 8b are exactly synchronized speed. Also in this embodiment, only a single air seal 14 of smaller diameter at the wire inlet 12 is necessary, which in use a die or a sleeve to the wire inlet is in turn completely unnecessary.

In the case of the wire-stranding machine 1 according to the invention in the exemplary embodiment according to FIG. 3, only one drive motor 8 is provided. This drives via two toothed belt drives, each with two toothed belt wheels 17a, 17b and in each case one toothed belt 18a, 18b both the inlet-side section 5 and the deflection-side section 6 of the rotor shaft. The arrangement of the motor 8 and of the first toothed belt drive for the inlet-side section 5 of the rotor shaft is essentially identical to the arrangement in FIG. 2. The second toothed belt drive for the deflection-side section 6 of the rotor shaft is relative to a vertical center axis of the wire-stranding machine 1 in FIG Essentially mirrored. The connection between the second belt drive and the motor 8 is effected by a countershaft 19. This is arranged parallel to the rotor shaft and forms an extension of the shaft 1 1 of the motor 8. In this way, the two belt drives and thus the two sections of the rotor shaft run with the same speed.

The enclosed space 2 in this case extends only around the two toothed belt drives around, but not around the motor 8 and the countershaft 19, whereby the volume of the closed space 2 can be kept small. As a result, the effort for the production and sealing of the enclosure 3 of the closed space 2 is correspondingly small, and it can be a vacuum pump low power can be used.

In this embodiment, two air seals 14 at the implementation points of the shaft 1 1 of the motor 8 and the countershaft 19 through the enclosure 3 of the closed space 2 are present. Due to the small diameter of the two shafts 1 1 and 19, however, the air seals 14 have a small diameter. The sealing of the wire inlet 12 again takes place in accordance with one of the possibilities described above. Alternatively, in this embodiment, the enclosed space

2 are so far extended that both the motor 8 and the countershaft 19 are arranged completely therein (shown in phantom in Fig. 3). In this case, the two air seals 14 can then be completely eliminated.

In the wire-stranding machine 1 according to the invention in the embodiment of FIG. 4, in turn, only a single drive motor 8 is provided for the rotor shaft. This is flanged from outside the enclosure 3 of the closed space 2 to the machine stand 7. However, the motor 8 is encapsulated in this case in an airtight housing, so that the implementation of the motor shaft 1 1 need not be sealed extra by the enclosure 3 of the closed space 2. The motor 8 drives similarly as in Fig. 2 and

3 via a toothed belt drive with two toothed belt wheels 17 and a toothed belt 18 to the inlet-side section 5 of the rotor shaft.

In contrast to the previous embodiments, no deflection-side section of the rotor shaft is provided in the embodiment of FIG. 4 at all, so that no drive must be provided on the deflection side. Instead, the guide roller 16 is rotatably supported only in a housing 22 by two bearings 23a and 23b, preferably two rolling bearings, about the geometric axis of the rotor shaft and is entrained by the rotor bracket 4 attached thereto and set in rotation. Here, the outer bearing 23a serves to support the housing 22 relative to the machine housing 7 and the inner bearing 23b for supporting the housing 22 against a non-co-rotating, to the rotor shaft coaxially arranged intermediate piece 24 between the housing 22 and the inlet-side section 5 of the rotor shaft. At the intermediate piece 24, for example, a coil carrier can be fastened in the interior of the rotor in other machine variants. The construction without deflection-side drive of the rotor is essentially made possible by virtue of the fact that the rotor yoke 4, due to the partial vacuum in the closed space 2, also has an enlarged cross section and thus can be made more stable without significantly increasing the air resistance of the rotor yoke 4. To increase the stability of the construction, a second, the first rotor yoke 4 in the plane of rotation diametrically opposite rotor yoke can be provided, which also results in a more uniform mass distribution and thus a lower imbalance in the rotation of the rotor.

By dispensing with a deflection-side drive of the rotor, a compact and simple construction of the wire-stranding machine 1 with a significantly reduced number of mechanical components is achieved. Also in this embodiment, the wire stranding machine 1 no air seals with touching and mutually movable parts are required. The wire inlet 12 is in turn realized in one of the variants already described above several times. In Fig. 4 for this purpose a wire inlet sleeve 13 is provided, whereby no such air seal is required at the wire inlet 12.

Fig. 5 illustrates a modification of the embodiment of FIG. 4, in which the inlet-side section 5 of the rotor shaft and the housing 22 for the guide roller 16 via two belt drives with two toothed belt wheels 17 a, 17 b and one toothed belt 18 a, 18 b connected to each other and so that they are speed-synchronized.

Such a drive at both ends of the rotor shaft may be expedient if the inlet-side section 5 of the rotor shaft and the housing 22 during operation of the Verlitzmaschine 1 have too much torsion against each other in the operation of the Verlitzmaschine 1 ,

In Fig. 6, finally, a plurality of rotor yokes are shown in a development, ie the surface of the rotor yoke was cut along the longitudinal axis and unwound in the plane of the drawing. Fig. 6a shows an unreinforced rotor bracket of the prior art, which has a constant width over its entire length and therefore results in a rectangle in the settlement. FIG. 6b shows a reinforced rotor bracket 4 for use in a wire stranding machine 1 according to the exemplary embodiment in FIG. 4, the axial ends of which are greatly widened. The straight center part 25 of the rotor yoke 4 merges into conical end pieces 25, the cross-sectional enlargement of the rotor yoke 4 being clearly visible on the end pieces 25 in the unwound representation at the greatly elongated vertical outer edges. As a result, the rotor yoke 4 is substantially warp ungssteifer and ensures a particularly rigid connection to the housing 22 for the guide roller 15 to take this in its rotation. The settlement can also have other contours, which lead to particularly advantageous Schnittkraftverläufen and / or Schnittmomentenverläufen in the rotor yoke 4 according to the strength calculation.

LIST OF REFERENCE NUMBERS

1 Verlitzmaschine

2 locked room

3 serving of the enclosed space

4 rotor yokes

5 inlet side section of the rotor shaft

6 Deflection-side section of the rotor shaft

7 Machine housing / machine stand

8, 8a, 8b engine

9a, 9b stator unit of the motor

10a, 10b Rotor unit of the motor

11, 1 1 a, 11 b motor shaft

12 wire inlet

13 wire inlet sleeve

14 air seal

15 pulley at the inlet end of the rotor shaft

16 pulley at the deflecting end of the rotor shaft 17, 17a, 17b toothed belt pulley

18, 18a, 18b toothed belt

19 countershaft

20 bearings for the rotor shaft

21 Electric transmission unit

22 Housing for the pulley

23a, 23b bearing for the pulley

24 intermediate piece

25 Middle part of the rotor bracket

26 end pieces of the rotor bracket

Claims

claims

A stranding or stranding machine (1) for stranding or stranding a strand material comprising a rotor having a one or more rotor shaft (5, 6, 22) driven by at least one motor (8, 8a, 8b) the stranding or stranding machine (1) is at least partially disposed in a closed space (2) filled with a medium having a density less than the density of the ambient air, characterized in that

- The rotor shaft (5, 6, 22) completely within the enclosure (3) of the enclosed space (2) is arranged or that

- The rotor shaft (5, 6) has at least a smaller diameter portion and at least a larger diameter portion and the enclosure (3) of the closed space (2) penetrates only in the at least one portion of smaller diameter.

Stranding or stranding machine (1) according to claim 1, characterized in that the rotor shaft (5, 6, 22) does not penetrate the sheath (3) of the enclosed space (2).

Stranding or stranding machine (1) according to at least one of the preceding claims, characterized in that the stranding or stranding machine (1) has no seals for sealing the closed space (2) with respect to the environment with contacting and rotating parts. Lacing or stranding machine (1) according to at least one of the preceding claims, characterized in that the rotational drive of the rotor takes place only at one axial end of the rotor.

Stranding or stranding machine (1) according to claim 4, characterized in that the rotor has at least one rotor bar (4) which is reinforced in the region of at least one of its axial ends (26) relative to its central part (25), in particular by an enlargement of its section.

Lacing or stranding machine (1) according to claim 4 or 5, characterized in that the rotor has at least two rotor yokes (4).

Stranding or stranding machine (1) according to at least one of claims 1 to 3, characterized in that the rotor shaft (5, 6) at both axial ends of the rotor by a respective motor (8a, 8b) is driven.

Stranding or stranding machine (1) according to at least one of claims 1 to 3, characterized in that the rotor shaft (5, 6) by exactly one motor (8) is driven, wherein the motor (8) with the two axial ends of the rotor is coupled by mechanical torque transmitting means (17a, 17b, 18a, 18b, 19) and the drive acts on both axial ends of the rotor shaft (5, 6), the mechanical torque transmitting means (17a, 17b, 18a, 18b, 19) being wholly or partly are arranged within the enclosed space (2).

Stranding or stranding machine (1) according to claim 8, characterized in that the mechanical torque transmission means (17a, 17b, 18a, 18b, 19) comprise at least one toothed belt (18a, 18b) and / or at least one shaft (19).

10. stranding or stranding machine (1) according to at least one of the preceding claims, characterized in that the geometric axes of the drive shaft (1 1 a, 1 1 b) of the at least one motor (8 a, 8 b) and the rotor shaft (5, 6 ) coincide. 11. Verlitz- or stranding machine (1) according to claim 10, characterized in that the at least one motor (8a, 8b) has a hollow shaft or to which the rotor shaft (5, 6) overlapping housing (7) is flanged.

Stranding or stranding machine (1) according to at least one of the preceding claims, characterized in that the medium is air with a lower density than the density of the ambient air.

Stranding or stranding machine (1) according to at least one of the preceding claims, characterized in that the medium is a gas which at the same pressure and temperature has a lower density than air, in particular helium or a helium-air mixture.

14. Verlitz- or stranding machine (1) according to at least one of the preceding claims, characterized in that the closed space (2) extends substantially only around the rotor.

15. Verlitz- or stranding machine (1) according to any one of claims 1 to 13, characterized in that the closed space

(2) extends substantially around the entire stranding or stranding machine (1).