EP1029974B1 - Sheathed synthetic fibre rope - Google Patents

Abstract

The cable, of twisted plastics strands, has anchor elements (13) twisted into the outermost twisted strand layers (11), bonded to the outer mantle (14). The anchor elements (13) and/or the outer mantle (14) are of materials which can be welded or vulcanized. The anchor element is at least one anchor strand (13) in at least one outer strand layer (11) with carrier strands (9). Or it is an anchor fiber twisted with the carrier strands at the outermost twisted strand layer. An Independent claim is included for a cable manufacturing process where the anchor element (13) is twisted in place so that, when the outer mantle (14) is fitted, a mol. bond is formed between them. Preferred Features: The anchor strand (13) is heated to its melting temp. before the mantle (14) is extruded over the twisted cable so that it is welded to the anchor. The anchors (13) are treated chemically before the mantle shrouding is in place, for the mantle and anchors to be vulcanized together.

Description

The invention relates to a sheathed synthetic fiber rope, preferably made of aromatic polyamide, according to the preamble of claim 1 and a method for its production the preamble of claim 8.

Running ropes are in conveyor technology, especially at Elevators, in crane building and mining, an important strong stressed machine element. It is particularly complex Stress on driven or over rope pulleys deflected ropes, such as those used in elevator construction and can be used for cable cars. There are big ones Ropes are necessary and it is for energy reasons the demand for the smallest possible masses. high-strength Synthetic fiber ropes, for example made from aromatic polyamides or aramids with highly oriented molecular chains meet these requirements better than steel cables.

Such a sheathed synthetic fiber rope is known from EP 0 672 781 A1 has become known to the applicant. There is the Plastic coating applied in a pressure spray process so that a large holding surface is formed towards the strands. However, the strands lead to the bending of the rope on the Pulley or pulley under certain conditions Compensatory movements by leading to relative movements of the strands different strand layers can lead. These movements are the largest in the outermost strand layer and can especially if the drive torque is frictionally locked over the each over the wrap angle on the sheave adjacent rope sheath section is stamped on the rope cause the casing to lift off prematurely and Upsets forms. Such a change in rope construction is undesirable because it has a short lifespan Rope can lead. The same applies to drums coiled ropes as used in elevator construction.

The invention has for its object a coated Synthetic fiber rope with a longer service life and a method for Manufacture to specify such.

According to the invention, this object is achieved with a synthetic fiber rope solved the features specified in claim 1. A solution to Manufacturing a synthetic fiber rope is characterized by the characteristics of Claim 8 given.

The advantages achieved by the invention are one permanent anchoring of the sheathing in the extreme Strand. In addition to the previous adhesive bond the largest possible contact area of the outermost Stranded layer, the sheathing is according to the invention with Anchoring means connected above the structural Structure are anchored in the outermost strand layer. The Binding forces between the casing and the Anchoring means correspond in particular to one one-piece connection of the material strength of the Anchoring means and thus exceed conventional ones Adhesive forces many times over. Are the anchoring means then positively connected to the outermost strand layer a detachment of the casing only with damage to the Aramid fiber strands possible.

Another advantage of incorporating the anchoring means in the rope structure of the outer strand layer combined with the one-piece connection, for example by gluing, to the Sheathing the anchoring means follow the movement or the Deformation of the outermost strand layer when the rope runs over the traction sheave. With a corresponding choice of material with suitable elastic deformability can in the Aramid fiber layer and the due to the bending load in the Sheathing forces mutually equalized and thus relative movements between the casing and Strand position can be prevented.

In a further development of the invention, the anchoring means and the casing made of weldable or vulcanizable materials educated. This choice of materials enables the Anchoring means and the sheathing without additional Binder. At the same time, the joint is permanent, shows same material behavior as the joining partners themselves and comes as a one-piece formation of anchoring means and sheathing the same. The is particularly homogeneous Joining point when the anchoring means and the sheath are made identical material are formed. The present Uniform material parameters simplify connection with uniform molecular connection of the parts to be joined.

In addition to the functional advantages achieved with the invention, the manufacture according to the invention is more encased Synthetic fiber ropes simple and with little adjustment conventional stranding machines. In a known way The inside of the rope is made in the outermost strand layer load-bearing fiber strands stranded with anchoring agents. Latter are then thermally or chemically pretreated before the Plastic coating is applied and go one molecular connection with the anchoring means. Apart from adjustment work is conventional Stranding machines retrofitting a pre-treatment station already sufficient.

The anchoring means and the sheathing together welded, is essentially a heater for Heating the anchoring means to provide it when Extrude the sheath into a permanent fusion of the cover with the anchoring means.

Another preferred method variant provides that Vulcanize sheathing on the outermost strand layer. at this version is made using a suitable pretreatment station a substrate is applied to the anchoring means, which etches them and thus for molecular networking with the extruded casing prepared.

The anchoring means are preferred Embodiment of the invention in the form of one or more Anchor strands formed, which together with load-bearing Aramid fiber strands are stranded to the outermost strand layer. By turning the strands helically around each other results from the twisted rope construction on simple Form a positive connection of the anchoring strand in the outermost Strand. The sheathing can be anchored by the number of the stranded wires stranded in the outer layer can be set. A particularly good form fit is at this embodiment achieved when the anchoring strands a smaller diameter than the load-bearing aramid fiber strands exhibit. The anchoring strand is in the circumferential direction each between two larger diameter aramid fiber strands pinched and thereby anchored in the strand layer. Prefabricated anchor strands can be used together with the Aramid fiber strands processed by the same stranding machine become.

The anchoring means can also be in the form of Anchoring fibers can be formed, which with aramid fibers load-bearing strands for the outermost strand layer with each other are twisted and fixed. The anchoring fibers are in the outermost fiber layer of the strands are arranged and in turn in one piece with the subsequently extruded casing connected. With a variety of such anchoring fibers results there is a large total connection area between the sheathing and anchoring them, which strengthens the connection and again the rope life increases. Furthermore, the thin Anchoring fibers in a short time and with comparative low energy expenditure can be heated to the melting temperature, which is why this embodiment has advantages in continuous Extruding the rope sheath offers.

The synthetic fiber rope according to the invention offers, for example Elevator systems benefits where there is one cabin frame in one Elevator shaft guided cabin with a counterweight combines. To lift and close the cabin and counterweight lower, the rope runs over a traction sheave by one Drive motor is driven. When running over the traction sheave takes place in the inventive synthetic fiber rope between the Rope sheath and the outermost strand layer no relative movement instead of.

Figur 1,

eine perspektivische Darstellung eines ersten Ausführungsbeispiels des erfindungsgemässen Treibseils mit Verankerungslitzen,

Figur 2,

eine Querschnittsansicht eines zweiten Ausführungsbeispiels des erfindungsgemässen Treibseils mit Umhüllung der Litzen,

Figur 3,

eine Querschnittsansicht eines dritten Ausführungsbeispiels der Erfindung mit Verankerungsfasern.

Further details of the invention are described below with reference to the three embodiments of the invention shown in the drawing. Show it:

Figure 1,

1 shows a perspective illustration of a first exemplary embodiment of the drive cable according to the invention with anchoring strands,

Figure 2,

2 shows a cross-sectional view of a second exemplary embodiment of the drive cable according to the invention with the strands being covered,

Figure 3,

a cross-sectional view of a third embodiment of the invention with anchoring fibers.

Figure 1 shows a first embodiment of a Rope covered according to the invention 1. The rope 1 is constructed from a core strand 2, around which in a first lay direction 3 five identical synthetic fiber strands 4 of a first strand layer 5 are helical, and with which ten Synthetic fiber strands 4, 6 a second strand layer 7 in Parallel strike under a balanced ratio between Fiber and strand lay twist are stranded. The number of stranded strands can meet the respective requirements be chosen accordingly differently and is not on that of this embodiment set. For the rope 1 load-bearing synthetic fiber strands 2,4,6,9 are used individual aramid fibers twisted or beaten and with a die Aramid fiber protective impregnating agent, for example treated with polyurethane solution.

An intermediate sheath 12 made of polyurethane or surrounds the cable core 8 Polyester on which an outermost strand layer 11 is stranded. The intermediate sheath 12 is immediately before the stranding outermost strand layer 11 extruded onto the rope core 8. He prevents contact between the outermost strand layer 11 and the second strand layer 7 and thus wear the Synthetic fiber strands 4, 6 and 9 by rubbing against each other when the rope 1 runs over the traction sheave and thereby Relative movement of the synthetic fiber strands 4, 6, 9 among themselves. In addition, the intermediate jacket 12 serves the inner Torque transmission between rope core 8 and outermost Strand layer 11.

The outermost strand layer 11 is in the first lay direction 3 stranded opposite second lay direction 10. She builds under longitudinal load of the rope 1 to that of parallel stranded rope core 8 oppositely directed Torque on.

A sheath 14 made of polyurethane envelops the outermost one Strand layer 11 and ensures the desired coefficient of friction Traction sheave. Furthermore, the polyurethane is so resistant to abrasion that no damage when the rope 1 runs over the traction sheave occur. The casing 14 is in one piece with Anchoring strands 13 made of polyurethane, for example Welding, vulcanizing or bonding. The Anchor strands 13 are form-fitting in the outermost one Strand layer 11 anchored. For example, here are nine of them Polyurethane strands 13 alternating with nine aramid fiber strands 9, in each case between two adjacent aramid fiber strands 9 stranded together to form the outermost strand layer 11.

In Figure 1, the aramid fiber strands 9 and Polyurethane strands 13 shown the same thickness, but can Form fit of the polyurethane strands 13 with the outermost Strand layer 11 can be further improved if the Polyurethane strands 13 are thinner than the aramid fiber strands 9. The thinner polyurethane strands 13 are in the circumferential direction between the adjacent larger diameter aramid fiber strands 9 clamped and in the radial direction on the Intermediate jacket 12 depressed.

The casing 14 is passed to the outermost Strand layer 11 extruded. With the spray printing process, this is flowable plastic material in all gaps of the Surface of the outermost strand layer, so that a large adhesive surface is formed. Before extruding the Sheathing 14, the polyurethane strands 13 on Melting temperature heated so that when extruding the Jacket 14 and the polyurethane strands 13 together be welded. The permanent created by it one-piece connection gives the casing 14 permanent fastening on the high-strength rope 1 over the improved form locking of the polyurethane strands with the outermost strand layer 11.

The cable sheath 14 can also be extruded in two layers. The above description then applies identically to the first applied coat layer. Figure 2 shows one Cross-sectional view of a second embodiment of a according to the invention sheathed rope 20. The rope core 21 and the Intermediate jacket 22 firmly adhering to it correspond with regard to function and structure corresponding parts of the First embodiment described above. On the Cable sheath 22 is an outermost strand layer 23 from seventeen Aramid fiber strands 24 stranded. Each individual aramid fiber strand 24 is made with a separate, all-round wrapping 25 Provided with polyurethane. The so far described Aramid fiber rope 20 is covered with a sheath 26. The Sheath 26 is made like sheath 25 of aramid fiber strands 24 made of thermoplastic polyurethane and is in one piece along the respective outer surface of the Cover 25 welded to the cover strand layer 23. About these permanent molecular connections is the sheath 26 positively connected to the aramid fiber strand 24. Also at In this embodiment, anchoring means are first in Form of the envelope 25 in the rope structure form-fitting anchored and immediately prior to extruding the sheath 26 by heating, gluing or etching or vulcanizing permanently connected to the casing 26.

In Figure 3 is a third embodiment of the invention an aramid fiber rope 30 is shown. The construction of the rope core 31, the this enveloping intermediate jacket 32 and the number of Synthetic fiber strands 33 of the outermost strand layer 34 are again same as for the two described above Embodiments. A cable sheath 37 surrounds the outermost one Strand 34 with which he is positively connected. Polyurethane fibers 35 are in the outermost fiber layer together with aramid fibers 36 arranged, i.e. on the outer surface of the jacket Synthetic fiber strands 33. Since the synthetic fiber strands 33 are wound helically around the intermediate jacket 32, it is ensured that the polyurethane fibers 35 at least in sections on the one adjacent to the casing 37 Surface come to rest. The polyurethane fibers 35 are just before extruding the jacket 37 and heated merge with the tightly pressed casing 37. As The polyurethane fibers are part of the synthetic fiber strands 33 35 form-fitting with the strand structure of the outermost Strand layer 34 connected. Consequently, it is also in one piece the sheath 37 connected to the polyurethane fibers 35 via a A large number of such polyurethane fibers 35 via this positive connection permanently anchored to the aramid fibers 36. The described embodiments of the invention can also can be combined with each other to create a desired one Form fixation of the jacket.

Claims (10)

1. Synthetic-fiber rope composed of load-bearing synthetic-fiber strands (2, 4, 6, 9, 24, 33) which are laid together and arranged in several layers, with a sheath (14, 26, 37) which is joined to and surrounds an outermost layer of strands (11, 23, 34) characterized in that
   the outermost layer of strands (11, 23, 34) has anchoring means (13, 25, 35) which are permanently fastened to the sheath (14, 26, 37) and which sheath (14, 26, 37) can only be separated from the outermost layer of strands (11, 23,34) by damaging the synthetic-fiber strands (9, 24, 33).
2. Synthetic-fiber rope according to Claim 1,
   characterized in that
   the anchoring means (13, 25, 35) and the sheath (14, 26, 37) are joined together in one piece.
3. Synthetic-fiber rope according to Claim 1 or 2,
   characterized in that
   the anchoring means (13, 25, 35) and the sheath (14, 26, 37) are made of materials which can be welded or vulcanized.
4. Synthetic-fiber rope according to one of Claims 1 to 3,
   characterized in that
   the anchoring means (13, 25, 35) are bonded with form fit to the outermost layer of strands (11, 23, 34).
5. Synthetic-fiber rope according to Claim 1 or 4,
   characterized in that
   the anchoring means take the form of at least one anchoring strand (13) laid in the outermost layer of strands (11) with load-bearing synthetic-fiber strands (9).
6. Synthetic-fiber rope according to Claim 1 or 4,
   characterized in that
   the anchoring means take the form of a jacket (25) which surrounds at least one synthetic-fiber strand (24) of the outermost layer of strands (23).
7. Synthetic-fiber rope according to Claim 1 or 4,
   characterized in that
   the anchoring means take the form of at least one anchoring fiber (35) which in the outermost layer of strands (34) is laid together with aramid fibers (36) to form load-bearing synthetic-fiber strands (33), the anchoring fiber (35) being arranged on at least some sections of the surface adjoining the sheath (37).
8. Process for manufacturing a synthetic-fiber rope composed of load-bearing synthetic-fiber strands (2, 4, 6, 9, 24, 33) which are laid together and arranged in several layers, with a sheath (14, 26, 37) which is joined to and surrounds an outermost layer of strands (11, 23, 34), characterized in that
   the synthetic-fiber strands (9, 24, 33) of the outermost layer of strands are laid with anchoring means (13, 25, 35), that the anchoring means (13, 25, 35) are pre-treated and when the sheath (14, 26, 37) is applied they enter into a molecular bond by which they are permanently bonded to the sheath (14, 26, 37), which sheath (14, 26, 37) can only be separated from the outermost layer of strands (11, 23, 34) by damaging the synthetic-fiber strands (9, 24, 33).
9. Process according to Claim 8,
   characterized in that
   the anchoring means (13, 25, 35) are heated to melting temperature before the sheath (14, 26, 37) is extruded onto, and welded to, the anchoring means (13, 23, 34).
10. Process according to Claim 8,
    characterized in that
    the anchoring means (13, 25, 35) are chemically pre-treated before the sheath (14, 26, 37) is vulcanized onto the outermost layer of strands (11, 23, 34).

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