DE2314254B2 - METHOD OF MANUFACTURING WIRE ROPES WITH A CORE WIRE STRAND AND A LAY OF SEVERAL WIRE STRANDS SURROUNDING THIS - Google Patents

Description

30th

The invention relates to a method with the features of the preamble of the main claim.

Wire ropes with a core wire strand and a surrounding layer of several wire strands such as for example 7x7 ropes or 6x7 rope ropes previously mechanically on simple stranding machines such as a tubular stranding machine or cage stranding machine manufactured, which work slowly, however, the manufacturing costs with small rope dimensions are also high.

It is also known to run wire ropes on a double twist twisting machine in which the individual wire strands are twisted together at the first stranding point and are further twisted together under tension at the second stranding point (US-PS 23 31 648). Double twist stranding machines work at a higher speed than simple stranding machines, however, it has been shown that wire ropes made on such machines with a core wire strand and a surrounding layer of several wire strands are often defective because the Core wire braids in relation to the wire strands of the surrounding layer are longer and periodically between the Wire strands of the outer layer is pushed out. Such errors cannot occur if the Stranding process is only carried out at a single point or if the wire rope does not have a core wire strand having. Therefore, up to now, double twist stranding machines have not been used for the production of wire ropes with one Core wire strand and a surrounding layer of several wire strands used, although the production also such wire ropes on a double twist stranding machine from the above. Reasons economic Offers advantages.

The object of the invention is to create the possibility of making wire ropes with a core wire strand and a surrounding layer of several wire strands in perfect and uniform To be able to produce quality on double wire stranding machines.

According to the invention, this object is achieved by a method having the features of the main claim solved Advantageous developments of the invention are the subject matter of claims 2 and 3.

According to the invention, at the first stranding point a core wire strand formed from several wires and several each also made from several wires twisted together and an outer layer forming wire strands brought together and with the same direction Twisted twist, whereby the wires of the core wire strand are twisted more tightly together shorten their lay length a little, and the wires of the outer wire strands are twisted up a little to increase their lay length, whereupon all wire strands at the second stranding point in the same direction are further twisted together, so that a further shortening of the lay of the core wire strand and one further extension of the lay of the wires of the outer wire strands while at the same time shortening the Impact of these individual outer wire strands occurs. The additional one that takes place at the second stranding point The shortening of the lay length of the core wire strand is at least as great as that on this second one Additional shortening of the lay length of the strand formed from individual wire strands outer layer of the wire rope.

Each wire strand of the wire ropes produced according to the invention consists of two or more individual wires. The number and size of the wires of the stranded core wire can vary with the number and size of the wires of the die Correspond or differ from the wire strands surrounding the core wire strand. The length of the lay can also be the core wire strand and the outer wire strand be the same or different before twisting. In all In some cases, however, the lay direction of the core wire harness is important opposite to the lay direction of the outer wire strands.

If the outer wire strands have a lay running to the right, the lay is the core wire strand to the left. In this case, the outer wire strands are at the first stranding point of the double-wire stranding machine laid with left-hand lay around the core wire strand, which means that these wire strands are twisted slightly will. The left lay wires of the core wire strand are twisted together more tightly at the same time and twisted together with the outer wire strands to increase the lay length of the core wire strand shorten.

At the first stranding point, the strands are only subject to the relatively low braking tension of the Reels from which the individual wire strands run off. The wire strands are made circular with the help of The arranged guides are correctly aligned and the guide in the middle groups the wire strands together to form a pre-twisted wire rope, which consists of a core wire harness and a layer surrounding it for example, has six wire strands. The partially finished wire rope thus formed then runs to the second stranding point of the double twist stranding machine, where the wire rope is finally twisted together. In this second stranding process, the lay of the outer wire strands is shortened, but the lay of the individual wires of the outer wire strands are extended. The lay of the wires becomes the core wire strand also shortened. This additional stranding at the second stranding point leads to the core wire strand

is shortened at least as much as the entire shortening of the outer wire strands, if in these outer wire strands a shortening should occur. This avoids the risk that the core wire strand throws itself and can be pushed out between the surrounding wire strands. An embodiment of the invention is explained below with reference to the drawing, namely shows

Fig. 1 is a partially sectioned side view of the essential parts of a double twist stranding machine on which wire ropes according to the invention Processes can be produced,

2 shows an enlarged section of an inventive manufactured wire rope,

3 shows a partial view of an outer wire strand the processing to a wire rope according to F i g. 2,

FIG. 4 is a partial view of the wire strand from FIG. 3, from which the final lay length of the wires after processing into a wire rope according to F i g. 2 can be seen,

F i g. 5 shows a partial view of the core wire strand before processing into a wire rope according to FIG. 2 and

F i g. 6 is a partial view of the core wire strand showing the final shortened lay length after processing the core wire strand to the wire rope according to FIG. 2 can be seen

The in F i g. 1 shown Doppeldrallverseii.naschi _n e is for performing the method of the invention particularly suitable. However, it is also possible to use the pay-off reels for the individual wire strands and the receiving mechanism in exactly the opposite direction as in FIG. 1 to be arranged. In both cases, wire ropes can be produced by the method according to the invention.

The double twist stranding machine from FIG. 1 has a housing with end walls 2 and 4. In the end wall 2 is arranged a same penetrating bearing in which a hollow shaft 8 is rotatably mounted. These Hollow shaft 8 has an extension 10. On the free end of which a bearing 12 is attached which has a plate-like shape circular frame 14, which is shown in FIG. 1 can only be seen in side view. This frame 14 supports several reels 16 on one side and several reels 18 on the opposite side. At the upper end 20 of the frame 14 is cut off, while it carries counterweights 22 at the lower end, so that it gets stuck in the position shown, even if the hollow shaft 8 and thus its extension 10 is rotated.

On the left end of the hollow shaft 8 sits a gear 24 with a drive (not shown) connected is. On the in F i g. 1 seen on the right side of the bearing 6, the hollow shaft 8 carries a dynamic balanced arm 26 with a small pulley 28 attached to one end thereof. Another Roller 30 is mounted in a recess in the hollow shaft 8, so that one of the roller 28 of the roller 30 The supplied wire rope passes into an axial passage 32 of the hollow shaft 8.

The other end wall 4 contains a bearing 34 in which a shaft 36 is rotatably mounted. At the right end of the shaft 36 there is a gear 38 which is connected to a drive (not shown). On in Fig. 1, a dynamically balanced arm 40 is also arranged on the left end of the shaft 36, which arm carries a roller 42 at one end. Another roller is mounted in the shaft 36 in such a way that a wire rope can run over it, which is fed from the axially arranged stranding sleeve 46 of the first stranding parts A.

The drive of the parts explained above is selected in such a way that the hollow shaft 8 and the shaft 36 are rotated at the same speed, as are the arms 26 and 40 associated with these shafts, the are aligned radially with one another, as shown in FIG. 1 thus shows the hollow shaft 8 and the shaft 36 rotating together with arms 26 and 40 at the same speed when the drives concerned are actuated, while the frame 14, which is supported on the extension 10 and carrying the reels 16 and 18 stop

The reels 16 and 18 carry the supply for the wire strands from which the wire rope is made. A total of seven reels are required for the present exemplary embodiment. A wire strand runs from the respective reel 18 via a guide roller 48 assigned to it to a centrally arranged roller 15, from where this wire strand is guided to the stranding sleeve 46. In a similar way, wire strands run from the reels 16 via guide rollers 54 to a roller 56 and from there through guides 52 and then together with the wire strands brought from the reels 18 to the stranding sleeve 46.

The frame 14 with the reels 16 and 18 stored in the same forms together with the associated guide rollers 48 and 54 and the rollers 50 and 56 the usual construction of a double twist stranding machine. so that a more detailed description of the construction of the same is superfluous.

From the reels stored in the frame 14, a plurality of wire strands are fed through eye-like guides 52 to the stranding sleeve 46, where a first stranding or first twisting together takes place because of the continuous rotation of the shaft 36. The partially stranded or twisted wire strands, which now form a loosely twisted rope, run over the roller 44. the roller 42 and the roller 28 to the roller 30 and from there in the axial direction through the passage 32 of the hollow shaft 8 to a holding roller 58, which holds the outer end of the advancing rope when this is finally twisted together by the rotary movements of the arm 26 at the second adjustment point B.

The take-up mechanism, which takes the wire strands continuously from reels 16 and 18 through the Machine pulls up to the holding roller 58 and finally to the cable take-up drum, is a common design and therefore not shown

The first twisting or stranding takes place at the stranding sleeve 46 of the first stranding point A between the guides 52 and the roller 44, while the second twisting or stranding takes place at the second stranding point B between the roller 30 and the holding roller 58. The number of rotations per unit length exerted on the wire strands at the first stranding point A is the same as the rotations exerted on the wire rope at the second stranding point β. In the illustrated embodiment, the wire rope has six outer wire strands, each formed from at least two wires, and one core wire strand, which also consists of at least two wires. The individual wires of the outer wire strands are laid to the right. The lay of the individual wires of the core wire strand runs to the left and thus opposite to the lay of the wires of the outer wire strands. The core wire strand in one

The six outer wire strands surrounding the layer are laid around the core wire strand with the lay running to the left. In the wire strands running off the reels 16 and 18, the lay length of the individual wires of the core wire strand can expediently, but not necessarily, be longer than the lay length of the individual wires of the outer wire strands, but runs in the opposite direction. Since the outer wire strands and the core wire strand are temporarily twisted together at the stranding point A , the lay of the individual wires of the core wire strand is shortened, while the lay of the individual wires of the outer wire strand increases somewhat at the same time, because the direction of rotation is the same as the direction of lay of the core wire strand, whereby the individual wires of the outer wire strands twist up a little.

Details of the wire rope produced according to the present embodiment are shown in FIGS. 2 to 6 The lay length of the core wire strand laid to the left, which it has at the first stranding point A , is denoted by X , while the lay length of the individual wires laid to the right of the outer wire strands, which it has at the first stranding point A , is denoted by Y is designated. The core wire strand 60 is twisted together from four wires 62, 64, 66 and 68 with the lay direction to the left, the lay length of the wires of the core wire strand being shortened at the first stranding point A by a distance C and at the second stranding point B further by a distance C ″ The exact shortening of the lay of the wires of the core wire strand is a function of the number of turns the wire rope experiences at the two stranding points.

The layer 70 surrounding the core wire strand 60 consists in the illustrated embodiment of six wire strands 72, 74, 76, 78, 80 and 82, each of these wire strands being formed from four wires which are preferably, but not necessarily, the same size as the wires of the core wire strand 60 have. The wire strands 72 to 82 fed to the first stranding point A preferably all have the same lay length. To simplify the illustration, the lay length of the individual wires of all wire strands, ie both the core wire braid 60 and the outer wire strands 72 to 82 surrounding it, is drawn to be the same size, ie the lay length A 'is shown to be equal to the lay length Y. In practice, the lay length X is shown but preferably greater than the lay length Y. In the finished wire rope shown in FIG. 2, the six outer wire strands have a lay length Z the lay length of the four individual wires of each outer wire strand in the finished wire rope is Y + O '+ O ", where O' is the dimension for the extension of the run at the first adjustment point A and O "is the dimension for the additional extension at the second adjustment point B.

From the above explanation it follows that with a double twist stranding machine with six reels, from which identical wire strands with wires laid on the right run off, and a further reel from which one is preferred, but not necessary. a wire strand of the same size, but with single wires laid on the left, runs off a wire rope that is twisted at the first stranding point A , whereby the lay of the core wire strand is shortened to length XC . At the first stranding point A , all of the wire strands are only under low tensile stress, which is generated, for example, by brakes, not shown, of the reels 16 and 18. By bringing the wire strands together and temporarily twisting them together in the area of the first stranding point A , the outer wire strands 72 to 82 form a layer surrounding the core wire strand 60 and hold the core wire strand in the central position, while the semi-finished wire rope produced in this way is transferred from the roller 44 over the rollers 42 , 28 and 30 to the second stranding point B and to the holding roller 58

When turning at the second stranding point B , the core wire strand 60 is held over the entire twisting length by the wire strands 72 to 82 surrounding it. Thus, at the second stranding point B, the core wire strand 60 is shortened by an additional distance C " which is at least as great as the total shortening of the outer wire strands 72 to 82. There is therefore no possibility that the core wire strand 60 of the finished wire rope between the outer wire strands outwards printed, which would damage the rope or render it unusable.

The net shortening of the outer wire strands is brought about by the fact that they are additionally twisted, this twist being less than the untwisting of the individual wires of the outer wire strands at the stranding points A and B, so that. like F i g. 2 and 4 show that the stroke is extended to Y + O '+ O "

For example, the shortening of the lay of the wires of the core wire strand is a sixth at stranding point A, while the further shortening of the lay at stranding point B results in the lay length of the core wire strand in the finished wire rope being only two thirds of the original lay length. The outer wire strands are twisted together with the core wire strand, the lay length of the same being shortened to the distance Z , as shown in FIG. 2 shows while the lay of the individual wires of the outer wire strands is increased by a distance which is more or less equal to the shortening of the lay length of the core wire strand. Therefore, the core wire strand behind the wide stranding point B has been shortened at least as much as the outer wire strands. This type of two-stage or double stranding prevents the core wire strand in the finished wire rope from being longer than the layer of outer wire strands surrounding it, so that the core wire strand cannot throw itself out or bulge.

So, with the invention, you are in a position to do so. Wire ropes with a core wire rope and one of these surrounding layer made of several wire strands on a double twist stranding machine, the Size of the core wire strand with the size of the surrounding wire strands or also deviate from this kana With double twist stranding machines wire ropes can be made at double speed as with known cage stranding machines at the same rotational speed.

For this purpose 2 sheets of drawings

Claims (3)

Patent claims: 1. A method for producing wire ropes with a core wire strand and a surrounding wire rope Layer of several wire strands with the individual wire strands at the first stranding point twisted together on a double twist stranding machine and under tension at the second stranding point of the double twist stranding machine are twisted together, characterized that around the core wire strand wire strands with a lay direction of the individual wire ^ to the of the individual wires of the core wire strand is opposite, are laid with a lay direction that is the same as the lay direction of the individual wires of the core wire strand 2. The method according to claim 1, characterized in that the wire rope with a core wire strand and outer wire strands are produced, the lay lengths of which are the same before twisting. 3. The method according to claim 1, characterized in that the wire rope with outer wire strands is produced whose lay length before twisting with the core wire strand of the lay length the core wire strand deviates.