EP0563586B1 - Method and device for producing high-strength steel cord - Google Patents

Abstract

The invention is based on the problem of developing a high-productivity double-twist stranding machine on the in-out principle, by means of which machine steel cords having a core wire can also be produced in the appropriate quality and the requirement of the user industry to accomplish multi-machine operation is satisfied. The said problem is solved in that the run-off bobbins (3) are each assigned a specially designed wire-pull brake (2), a conically shaped deflecting roller (6) is arranged in the region of the first deflection point, and the common stranding point (8) for the first and second stranding twist is arranged between the run-off bobbins (3) and deflecting roller (6). The sector of use of the invention is primarily in the field of stranding-out double-twist stranding machines (in-out). <IMAGE>

Description

The invention relates to a method and an apparatus for manufacturing high-strength steel wire strands, especially of steel cord, which in The preamble of claims 1 and 6 respectively indicated Smoothing.

Double twist stranding machines e.g. according to DE-OS 24 62 092 since several years also used for the stranding of steel wires. In In this machine, the individual winding spools are aligned one behind the other each arranged between gear stands. Every single one Wire is fed around the coils into the center of the axis by roller systems Rotor and from there through a bearing pin to the next coil frame where it is connected with the wires to be added in the previous described way is forwarded. The wires are at the rotor end via a deflection roller that rotates synchronously with the rotor in the opposite direction deflected and in a sinusoidal curve around the coils in each case out the other end of the rotor. Outside of the stranding system are one Over-twist device to eliminate the twisted twist large torsional stresses present in the strand as well as a deduction and Rewinder arranged. The first stranding point lies in the area of the first Deflection pulley and the second stranding point for realizing the double lay is located at the end of the stranding machine. With this highly productive However, the machine can only manufacture hollow strands in accordance with quality will. This machine is used for the production of strands with core wire not suitable, since the core wire approximates its length during the stranding maintains and is therefore longer than the wires of the top layer, the is shortened by the second stranding twist and the result is a disadvantageous Deformation of the strand causes. It also requires rewinding the finished steel wire strand a high operating effort because a constant Spool change of the take-up spool by the operator is necessary. The Spool volume of all payout spools is usually a multiple of Spool volume of the take-up spool.

DE-OS 1510091 describes a method for transmitting a rotary movement from one to the other other outer part of a thread-like element with two different ones around the axes measured speeds as well as a machine for stranding elements after the mentioned methods have been disclosed. These as both out-in and as Stranding machine designed in-out has several stranding stations, each with one rotary driven stranding bracket, which is rotatably mounted on both sides

The drain or take-up spools are stored in a cradle within the stranding bracket. To the The desired twisting of the rope can be realized by a large number of guide elements on the Stranded brackets arranged to exert a force component on the thread-like element. to twist the rope around its longitudinal axis as it passes through the stranding bracket, the arcuate rope parts have a minimal arc radius. The executive bodies are "inclined" to the longitudinal direction of the rope and can be pivoted via bearing blocks on the stranding bracket arranged and designed as diabolo-shaped rolls.

They are theoretically suitable with a correspondingly inclined arrangement on the stranding bracket. To transfer rotary movements to the rope. To the required small arc radius however, it is necessary to realize it. many individual management bodies from roles and bearing blocks as Arrange row of roles on the stranding bracket, the looping of the rope on each role very is low.

This leads to the fact that the force component additionally twisting the rope is very small, so that due to the bearing friction in particular, neither a rotation of the rollers nor an advantageous one Rope twist can be expected. For a quality production of strands with This machine is not suitable for core wire, especially high-strength steel wire strands. Furthermore, the wire guides can be assessed as complex and fragile.

Acceptable ironing speeds are also not achievable due to the large "rotating" masses.

The invention is based, a highly productive double twist stranding machine to develop in-out according to the principle Help also steel wire strands with core wire quality and without that Disadvantages of the prior art can be produced.

This object is achieved according to the invention in the claims 1 (Method) or 6 (device) specified features solved.

The advantages achieved with the invention are that a wide Production program including steel wire strands with core wire in line with quality can be manufactured and the requirements of the user industry after simple operation also several stranding machines by one Operator can be satisfied by constantly changing the take-up reels (Removal, loading) during the entire stranding process, i.e. the continuous stranding of the stranded material of the pay-off spools can be.

Since the second twist with high-strength steel wire in the area of Flight curve can not be easily realized, according to the invention the stranding concentrates on a point in the area in front of the first deflection roller, the management of the bandage or the strands designed in this way is that the entire dressing rotates about its longitudinal axis, at twice the speed of the rotor. The stranding has already in the area between the payout spool and the pulley twice the speed (stranding speed) of the rotor, so that the stranding already immediately after the Deflection pulley has its final twist speed (double) and on the way to the second pulley is only guided and maintained. An essential means here is the conically shaped pulley.

Advantageous embodiments of the invention are in claims 2 to 5 and 7 to 10.

Fig. 1:

eine komplette Verseileinrichtung in schematischer Seitenansicht;

Fig. 2:

eine dem Verseilpunkt in der Verseileinrichtung nach Fig. 1 nachgeordnete Umlenkrolle in Draufsicht;

Fig. 3:

schematisch eine Drahtzugbremse für einen von einer Ablaufspule abgezogenen Draht;

Fig. 4:

schematisch einen Doppelscheibenabzug für die Litze in Seitenansicht;

Fig. 5:

schematisch einen Aufwickler mit mehreren Spulenaufnahmen;

Fig. 6:

ein Überführungselement des Aufwicklers nach Fig. 5.

In the following an embodiment of the invention will be described with reference to the drawing. Show it:

Fig. 1:

a complete stranding device in a schematic side view;

Fig. 2:

a deflection roller downstream of the stranding point in the stranding device according to FIG. 1 in plan view;

Fig. 3:

schematically shows a wire pull brake for a wire drawn from a payout spool;

Fig. 4:

schematically a double disc trigger for the strand in side view;

Fig. 5:

schematically a rewinder with several reel seats;

Fig. 6:

a transfer element of the rewinder according to FIG. 5.

The stranding device shown in Fig. 1 contains a double twist stranding machine 1, in the rotating system of which several spools 3 one wire brake 2 each mounted in a common coil frame 1a are. The coil frame 1a is around the end hollow pin 1b, 1c Center axis M rotatably mounted, but rotates due to its own weight not during the stranding process. The stranding machine 1 are one Double disc take-off 4 and a winding station with a laying device 5 subordinate.

In the machine axis M is on or in a possibly hollow pivot conical deflection roller 6 mounted, the longitudinal axis of which is substantially vertical runs to the central axis M. This deflection roller 6 forms a first Deflection point for the stranded material drawn off together by the run-off rollers 3, that - as shown in Fig. 2 - runs on its largest diameter part and during the deflection on their jacket to the narrower end part slides down by twisting. Due to the effect of the conical pulley 6 experiences that formed by the individual running wires 7 Stranded a complete stranding, the first and second stranding twist be united in a stranding point 8. As shown in Fig. 1 each wire drawn from the respective payout spool 3 is over each have a radially inner roller and from this via a radially inner one Actuating roller 2a of the band tension brake shown in detail in FIG. 3 2 out, so that all running wires in the illustrated embodiment at a small lateral distance to the central axis M, to the stranding point 8 and then as a strand in the central axis M through the hollow Pins extend through to the wider end part of the conical deflection roller 6.

A flyer 10a and 10b is mounted at each end of the coil frame la, which each have a conical holder with one arranged on its edge Deflection or guide element 11a, 11b in the form of a roller or a nipple exhibit. The pulled off from the narrower end part of the deflection roller 6, now in its structure finished steel wire strand 9 runs to the guide element 11a of the first flyer 10a and from this in a free flight arch the guide element 11b of the second flyer 10b to one in the bearing journal of the second flyers 10b transverse to the central axis M deflection roller 11c. The Both flyers 10a, 10b are sent together via suitable gears, e.g. Timing belt drives, driven synchronously by a drive unit, not shown, the being in or on the hollow journal of the first flyer 10a mounted conical deflection roller 6 together with the flyer 10a around the Center axis M rotates.

The wire pull brake 2 shown in FIG. 3 is a so-called dancer-controlled Brake executed and contains a two-armed pivot lever 2b, on the one arm the operating roller 2b wrapped in the running wire 7 is mounted and engages a spring 2c at the other end. The the Actuating roller 2a carrying lever arm is connected to a push rod with a lever-like brake shoe 14 connected, the brake pad 16 against the braking surface 15 a brake disc attached to the shaft of the payout spool 3 13 presses. The braking surface 15 is preferably chrome-plated, ground and polished and has a roughness of less than 3.2 pm. The braking or The friction lining 16 of the pivotable brake shoe 14 suitably consists of tetrafluoroethylene with a carbon content of about 25%. Through this training the brake can fluctuate the wire tensile force by a maximum of 5% can be realized over the entire coil filling.

The one that was already structured when it entered the first flyer 10a Strand 9 remains in its structure in the area of the free flight curve receive the two flyers 10a and 10b and will leave the stranding machine 1 of the deflecting roller 11c rotating around the central axis M in introduced the double disc trigger 4. This is shown in detail in FIG. 4 Double disc trigger 4 contains two axially parallel with spacing mounted rollers 4a, 4b, of which at least one roller 4a with circumferential grooves 4c can be provided. At least one of these roles has one Level 4d. As shown, the steel wire strand 9 runs in several orderly loops around the two rollers 4a and 4b and experienced by the jump caused by level 4c from the smaller to the larger roll diameter a defined increase in tractive force due to the torsional stresses be dismantled in the strand. For further complete dismantling of internal tension is at least between the two rollers 4a, 4b a post-forming device 17 is provided which has at least one row of Straightening rolls arranged one behind the other with mutual dislocation has, their mutual transfer according to the respective product and Operating conditions can be set. The steel wire strand 9 runs in a wavy path over the rollers, and through the resulting Bending and flexing effects result in stress relief and position corrections of the stranded wires.

Then the steel wire strand 9 is the laying device 5 of the Winding device supplied, which is shown in Fig. 5 in detail and includes a rotatably driven and laterally movable coil package 18. Since the spool volume of the payout spools 3 is many times larger than the spool volume of a take-up spool 19 is in the spool package 18 so many take-up reels 19 axially arranged side by side that their total volume corresponds at least to the total coil volume of the supply coils 3. 5 and 6 are arranged axially one behind the other Take-up spools 19 deflection and centering disks 20 arranged, whose outer diameter is larger than that of the coil flanges 21. The Deflection and centering disks 20 have slightly conical recesses 22 Bracket each on a coil flange 21.

The take-up spools 19 and the deflecting and centering disks 20 are through an axis 24 freely protruding through its central bores, the each end with a support flange 23 and screw connections 25 at the end is provided.

Both ends of the axis 24 represent the counterparts of the rewinder receptacle 26 are arranged in a frame 27 and with a rotary drive and a displacement device are connected.

Furthermore, 20 are even over the circumference of the deflection and centering distributed transfer elements 28 for the steel wire strand to be wound up 9 arranged. The transfer elements 28 are sawtooth-like and limited execution.

Depending on the size of the coil package 18, this is as required entire coil package 18 by a pair of idlers 12 against an impermissible Deflected supported.

• Die Verlegeeinrichtung 5 hält die aufzuwickelnde Stahldrahtlitze 9 jeweils senkrecht zur jeweiligen Spulenachse, wobei im Bereich des äußeren Spulenflansches 21 eine der beiden äußeren Aufwickelspulen 19, in bekannter Weise beginnend, aufgewickelt wird,
• entsprechend der Anzahl der axial nebeneinander angeordneten Aufwickelspulen 19 wird jeweils nach Füllen der in Arbeitsstellung befindlichen Aufwickelspule 19 die Verseilmaschine 1, einschließlich des Spulenpaketes 18, angehalten und das Spulenpaket 18 axial verschoben, so daß die nächste Aufwickelspule 19 sich in der Arbeitsstellung befindet, wobei die Stahldrahtlitze 9 über den Spulenflansch 21 der vorhergehenden Aufwickelspule 19, über eine zwischen den Aufwickelspulen 19 angeordnete Abweis- und Zentrierscheibe 20 und den Spulenflansch 21 der nachfolgenden Aufwickelspule 19 geführt wird,
• während des Anfahrens der Verseilmaschine 1, einschließlich des Spulenpaketes 18, wird die Stahldrahtlitze 9 von einem der auf dem Umfang der Abweis- und Zentrierscheibe 20 gleichmäßig verteilten Überführungselemente 25 erfaßt und auf die Spulennabe aufgelegt, so daß das Auflegen der Stahldrahtlitze 9 in unmittelbarer Nähe des Spulenflansches 21 erfolgt.

The finished steel wire strand 9 is laid and wound up as follows:

• The laying device 5 holds the steel wire strand 9 to be wound in each case perpendicular to the respective coil axis, one of the two outer winding spools 19 being wound in a known manner in the area of the outer coil flange 21,
• According to the number of winding spools 19 arranged axially next to each other, after filling the winding spool 19 in the working position, the stranding machine 1, including the spool package 18, is stopped and the spool package 18 is moved axially, so that the next winding spool 19 is in the working position, the Steel wire strand 9 is guided over the coil flange 21 of the preceding take-up reel 19, over a deflecting and centering disk 20 arranged between the take-up reels 19 and over the coil flange 21 of the following take-up reel 19,
• during the start-up of the stranding machine 1, including the coil package 18, the steel wire strand 9 is gripped by one of the transfer elements 25 distributed uniformly on the circumference of the deflecting and centering disc 20 and placed on the spool hub, so that the laying of the steel wire strand 9 in the immediate vicinity of the Coil flange 21 takes place.

Claims (10)

1. Method for producing high-strength steel wire strands, in which the wires are drawn off brakable pay-off reels arranged within a reel frame and are stranded using the double-twist principle and in which the steel wire strand is wound by means of a laying device onto reels which in each case have a substantially smaller receiving capacity than the pay-off reels,
      characterized

   in that the wires (7) drawn off the pay-off reels (3) at a constant tensile force run onto the greatest diameter of a conical deflection roller (6) arranged at the first deflection point of the stranding stock and during their deflection slide down on the deflection roller (6) towards the smaller diameter and are thereby set in rotation,

   in that the wires (7) between deflection roller (6) and pay-off reels (3) undergo the first and second stranding twist at a single stranding point (8) and are stranded to form the steel wire strand (9) having a finished structure,

   in that the steel wire strand (9) having a finished structure, in order to preserve the stranding structure, is guided from the first flyer (10a), arranged in front of the reel frame (1a), in a free flight curve to the second flyer (10b), arranged behind it, and is rotated about itself at twice the rotational speed of the flyers (10a; 10b) and

   in that the steel wire strand (9) is subjected to a post-forming operation and a defined increase in tensile force before being wound, in order to relieve its internal torsional stresses.
2. Method according to Claim 1,
      characterized
      in that the internal torsional stresses of the steel wire strand (9) are relieved in a double-capstan withdrawal device (4) having a jump in the diameter to the larger one and in post-forming devices (17), and in that the steel wire strand (9) free from torsional stresses is fed via the laying device (5) to a rotationally driven and laterally movable reel assembly (18) comprising a plurality of take-up reels (19) arranged axially side by side.
3. Method according to Claim 1 or 2,
      characterized
      in that the take-up reels (3) are braked, in order to achieve the approximately constant tensile force, by in each case one dancer-roller-controlled wire tension brake (2) whose brake disc (13) has a chromium-plated, ground and polished brake surface (15) with a roughness of < 3.2 µm and whose brake shoe (14), actuated by the dancer-roller arrangement (2a, 2b), has a friction lining (16) made of tetrafluoroethylene with a 25% carbon content, so that a maximum variation of 5% in the wire tensile force over the entire reel filling is achieved.
4. Method according to one of Claims 1 to 3,
      characterized by the following method steps

   the laying device (5) holds the steel wire strand (9), to be wound, in each case perpendicularly to the respective reel axis, the steel wire strand (9) being wound onto one of the two outer take-up reels (19) initially in the region of the outer reel flange (21),

   in accordance with the number of take-up reels (19) arranged axially side by side, after filling of the take-up reel (19) located in the working position, the stranding machine (1), including.the reel assembly (18), is in each case stopped and the reel assembly (18) axially displaced so that the next take-up reel (19) is located in the working position, the steel wire strand (9) being guided via the reel flange (21) of the preceding take-up reel (19), via a deflecting and centring disc (20) arranged between the take-up reels (19), and via the reel flange (21) of the following take-up reel (19),

   during the approach of the stranding machine (1) and of the reel assembly (18), the steel wire strand (9) is grasped by one of the transfer elements (25) evenly distributed over the periphery of the deflecting and centring disc (20) and is put onto the reel hub, so that the putting-on of the steel wire strand (9) takes place in the immediate vicinity of the reel flange (21).
5. Method according to one of Claims 1 to 4,
      characterized
      in that the laying device (5) and the displacement of the reel assembly (18) are controlled by means of a computer system such that the winding process always begins directly at the reel flange (21) adjacent to the last-filled take-up reel (19).
6. Apparatus for producing high-strength steel wire strands comprising

   a double-twist stranding machine (1) with a plurality of pay-off reels (3) mounted in the reel frame (la) and braked by in each case one wire tension brake (2),

   a downstream strand withdrawal device and

   a rotationally driven and laterally movable reel assembly (18) with interchangeable take-up reels (19) and a laying device (5),

   characterized

   in that a conically shaped deflection roller (6) is arranged in the region of the first deflection point of the stranding stock on the centre axis M,

   a common stranding point (8) for the first and second stranding twist is arranged in the region between pay-off reels (3) and deflection roller (6),

   a flyer (10a; 10b) with in each case one guiding member (11a; 11b) for the steel wire strand (9) running from the smaller diameter of the conically shaped deflection roller (6) is rotatably mounted at each end face of the reel frame (la), the steel wire strand being guided in a free flight curve between the two flyers (10a; 10b) and

   a device (4; 17) for relieving the torsional stresses in the steel wire strand (9) is arranged between the second flyer (10b), arranged on the discharge side, and the reel assembly (18).
7. Apparatus according to Claim 6,
      characterized

   in that each wire tension brake (2) has a brake shoe (14), which is coupled to the pivot lever (2b) of a dancer roller (2a) and has a friction lining (16) made of tetrafluoroethylene with 25% carbon, and also a brake disc (13) which is connected in a rotationally fixed manner to the pay-off reel (3) and whose chromium-plated, ground and polished brake surface (15) has a roughness of < 3.2 µm, in that the device for relieving torsional stresses is designed as a double-capstan withdrawal device (4) with a jump in the diameter to the larger one and with post-forming devices (17) and

   in that the take-up arrangement is constructed to receive a rotationally driven and laterally movable reel assembly (18) comprising a plurality of take-up reels (19) arranged axially side by side, and the entire reel assembly (18) is supported by supporting rollers (12) against impermissible deflection.
8. Apparatus according to Claim 7,
      characterized
      in that the reel volume of all the take-up reels (19) corresponds to the reel volume of all the pay-off reels (3.
9. Apparatus according to Claim 7 or 8,
      characterized
      in that the take-up reels (19) arranged axially side by side are separated from one another by deflecting and centring discs (20) whose outside diameter is greater than that of the reel flanges (21), in that recesses (22) having the diameter of the reel flanges (21) are made in the deflecting and centring discs (20), and in that the take-up reels (19) and the deflecting and centring discs (20) are braced by an axle (24), arranged freely in their bores and provided at the end faces with in each case one supporting flange (23), with screw-connection elements (25), and both ends of the axle (24) constitute the counterparts of the receptacle (26) of the take-up.
10. Apparatus according to one of Claims 7 to 9,
       characterized
       in that, for example, sawtooth-like and crossed transfer elements (28) for the steel wire strand (9) to be wound are arranged in an even distribution over the periphery of the deflecting and centring discs (20).

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