Non-rotating wire rope, method for producing same, and lifting device comprising a drum drive

Abstract

The invention relates to a non-rotating wire rope (1; D1', D2'), in particular a non-rotating round wire rope, which has a core cable (2) and outer wires (4) which surround the core cable, said outer wires forming a single outer wire layer (3). Advantageously, the core cable (2) comprises multiple core cable inner wires (5, 6) which are introduced into a plastic matrix (9) and which are surrounded by core cable outer wires (8) that form a core cable outer layer (7). Advantageously, a relative movement of the core cable wires can be carried out in the longitudinal direction as well as in the circumferential direction. The invention additionally relates to a method for producing a non-rotating wire rope and to a lifting device comprising a drum drive which has a non-rotating wire rope according to the invention, said wire rope being designed as a running cable.

Description

[0001] Description:

[0002] “Rotation-resistant wire rope, method for its manufacture and lifting device with a

[0003] drum drive"

[0004] The invention relates to a rotation-resistant wire rope, in particular a rotation-resistant round strand rope, which has a core rope and outer strands surrounding the core rope, which form a single outer strand layer.

[0005] Furthermore, the invention relates to a method for producing a rotation-resistant wire rope and to a lifting device with a drum drive, which has a rotation-resistant wire rope according to the invention, wherein this rope is designed as a running rope.

[0006] A hammered, non-rotation-resistant wire rope is known from DE 20 2013 102 594 U1. Rotation-resistant wire ropes are known from DE 39 37 588 A1, CH 545881 A, DE 29 49 754 C2, and "Special Wire Ropes / / Spezialdrahtseile / The Premium Line" (available on September 25, 2024, at https: / / www.casar.de / Portals / 0 / Documents / Product-Specs / powerplast.pdf). Each of these known wire ropes has a core rope that is completely embedded in a plastic matrix, meaning its core strands are completely surrounded by the plastic of the matrix.

[0007] In order to create the plastic matrix, it is also known from the prior art, in particular from DE 39 37 588 A1, that incomplete strands form a core rope. Incomplete means that individual strand wires were omitted during the production of the strands, creating a channel through which a plastic forming a plastic matrix can flow into the core rope during core rope production and completely surround the core rope strands.

[0008] Whether a wire rope is rotation-resistant can be determined by a standardized test described in ISO 21669 (“Steel wire ropes - Determination of rotation properties”; version: 02 / 2005):

[0009] A wire rope with a length of 1000 xd (d = nominal diameter of the wire rope) is subjected to a tensile load by a force F, where the force F is 20% of a minimum breaking force (= F min) of the wire rope. A rotation angle (p of the wire rope is determined, through which the wire rope rotates around its longitudinal axis under the specified load. For a rotation-resistant wire rope, the following applies: - 360° < (p < 360°.

[0010] The invention is based on the object of creating a particularly stable, rotation-free wire rope of the type mentioned above with a long service life.

[0011] Furthermore, the invention is based on the object of creating a device with a drum drive that is particularly low-maintenance.

[0012] According to the invention, the object is achieved in that the core rope comprises a plurality of core rope inner strands which are introduced into a plastic matrix and which are surrounded by core rope outer strands which form a core rope outer strand layer.

[0013] Because only the core rope inner strands are fully embedded in the plastic matrix in one circumferential direction, they do not directly abut one another and are therefore movable relative to one another when a rotation-resistant wire rope according to the invention is loaded, for example, when used as a running wire rope in a device with a drum drive, such as a crane. Advantageously, when loaded, a relative movement of adjacent core rope inner strands can occur both in a longitudinal direction and in a circumferential direction.

[0014] The inventor has found that by using a core rope of the type mentioned, despite a relatively low core rope fill factor, a rotation-resistant wire rope with a particularly high actual breaking force F mis created. According to the state of the art, the higher the fill factor, the more fracture-resistant a wire rope is. The fill factor is the ratio of the wire cross-section of all wires forming the wire rope to the wire rope cross-section.

[0015] For example, a fill factor of 0.70 means that a wire rope cross-section consists of 70% wires forming the wire rope.

[0016] In particular, the inventor has surprisingly found that a wire rope according to the invention with a core rope of the type mentioned has a higher actual breaking force F despite a lower core rope filling factor. m than a wire rope of the same design with a higher core rope fill factor. Overall, the inventor has overcome the technical prejudice that a high fill factor means high breaking strength, which corresponds to the actual breaking force F m expressed is required.

[0017] The actual breaking force Fm is a general term for a wire rope property known to the expert and can be determined according to DIN EN 12385-3 (version: 01 / 2009), section 6.4).

[0018] Wire ropes are classified into so-called rope strength classes, whereby a rope strength class is for ropes with a certain actual breaking force F m To ensure a high actual breaking force F m To achieve this, the wires forming the wire rope must achieve certain tensile strengths defined in standards. Since high-tensile wires are brittle, wire ropes with a high actual breaking force F m usually have low fatigue strength. Due to the fact that a rotation-resistant wire rope according to the invention with a core rope of the type mentioned has a higher actual breaking force F mthan a comparable rotation-resistant wire rope with a core rope known from the prior art, the wire rope according to the invention can be manufactured using wires with lower tensile strength, while still achieving the required higher rope strength class. Such wires with lower tensile strength are less brittle, so that a rotation-resistant wire rope according to the invention with particularly good fatigue strength under bending stress and simultaneously high actual breaking force F m is created.

[0019] Elastomers or thermoplastics are particularly suitable as plastics for forming the plastic matrix, especially polyethylene (PE) or polypropylene (PP).

[0020] For practical purposes, only the several core rope inner strands of the core rope are completely inserted into the plastic matrix.

[0021] The inventor has recognized that in order to produce a particularly durable wire rope, the entire core rope does not have to be inserted into a plastic matrix, but surprisingly it is already sufficient if the core rope inner strands are completely surrounded by plastic and embedded in the plastic matrix.

[0022] Advantageously, a simple-to-manufacture, fatigue-resistant wire rope is created, which is particularly suitable for use as a running wire rope in a device with a drum drive. In one embodiment of the invention, the core rope outer strands, which are only partially embedded in the plastic matrix, lie directly against the outer strands with the core rope outer strand regions facing away from the core rope inner strands.

[0023] The inventor has found that core rope inner strands fully embedded in the plastic matrix and core rope outer strands partially embedded in the plastic matrix already result in an improvement in mechanical properties. This is surprising, since it is known from the prior art that a core rope must be fully embedded in a plastic matrix in order to achieve high fatigue strengths when used as a running wire rope.

[0024] Because the core rope outer strand areas facing the core rope inner strands are surrounded by plastic, they are movable in a rope longitudinal direction relative to the core rope inner strands and do not lie directly against each other.

[0025] Surprisingly, the inventor discovered that high fatigue strength, which is expressed, for example, in a high number of bending cycles until the rope is ready for discard, is possible even though the outer strands of a rotation-resistant wire rope according to the invention are in direct contact with the core rope's outer strands. This is surprising because the prior art teaches that a plastic intermediate layer is required between the core rope and the outer strands to prevent direct contact between adjacent wires, thus reducing wear and extending the service life of the wire rope.

[0026] Advantageously, the core rope outer strands of the core rope are only inserted into the plastic matrix with the core rope outer strand regions facing the core rope inner strands, and the core rope outer strand regions facing away from the core rope inner strands are not inserted into the plastic matrix.

[0027] Partially embedding the core rope into the plastic matrix ensures that the core rope's outer strands are movable relative to the core rope's inner strands. At the same time, the outer strands are in direct contact with the core rope's outer strands.

[0028] It has been found to be advantageous for high fatigue strength when the core rope outer strands are embedded in the plastic matrix with at least half of their base surface facing the core rope inner strands.

[0029] The inventor has surprisingly discovered that it is advantageously not necessary to incorporate all core rope strands into a plastic matrix in order to achieve better properties. Furthermore, a rotation-resistant rope is created that can be manufactured using less plastic. In one embodiment of the invention, adjacent core rope outer strands are separated from one another by the plastic matrix, which extends from the core rope inner strands in the radial direction of the wire rope to the core rope outer strands. The plastic matrix extends in the radial direction of the core rope only far enough that the core rope outer strand regions facing away from the core rope inner strands are not incorporated into the plastic matrix.

[0030] It has been found to be advantageous for high fatigue strength when the core rope outer strands are embedded in the plastic matrix with at least half of their base surface facing the core rope inner strands.

[0031] Advantageously, adjacent core rope strands in the radial or circumferential direction are not directly adjacent to one another. This ensures particularly good relative mobility of the core rope strands, even though the outer core rope strands are only partially embedded in the plastic matrix in their circumferential direction.

[0032] In one embodiment of the invention, the core rope is compacted.

[0033] Preferably, only the core rope is compacted, not the entire wire rope. A compacted core rope differs from a core rope made from compacted strands in that the compaction only takes place after the core rope has been manufactured. Compaction takes place before an outer strand layer is applied to the core rope. The core rope is preferably hammered. Other compaction processes are conceivable. Compacting the core rope also creates a flat and smooth core rope surface. An outer strand layer, which is applied to the core rope to form the wire rope, can, for example, be applied directly to the flat and smooth surface. Damage caused by individual wires of core rope outer strands touching outer strands of the rotation-resistant wire rope can be advantageously prevented.

[0034] Another advantage is that the outer strands of the wire rope are movable relative to the core rope, meaning they can slide along the flat and smooth core rope surface when the wire rope is loaded. This prevents stress conditions that could damage the wires.

[0035] It is understood that core rope strands, in particular core rope inner strands and / or core rope outer strands, can already be compacted. For this purpose, each of the strands forming the core rope can be compacted before being stranded into the core rope, and the core rope itself can be further compacted after its manufacture. In a further embodiment of the invention, the outer strands are applied directly to the core rope.

[0036] A further increase in mechanical properties, in particular an increase in fatigue strength, is possible when the core rope is additionally compacted.

[0037] This finding is surprising, since the prior art teaches that break-resistant and fatigue-resistant wire ropes for use as running wire ropes can only be created if friction between wires of adjacent strands is largely prevented. This can be achieved, for example, by a plastic layer between the core rope and the outer strand layer. However, this is not required according to the invention; rather, the outer strand layer can be applied directly to the core rope in such a way that adjacent wires of the core rope's outer strands and the outer wires of the outer strands are in direct contact with one another in the radial direction.

[0038] The inventor has recognized that by applying an outer strand layer directly to the core rope, a rotation-free wire rope is created that is particularly break-resistant.

[0039] Advantageously, the wire rope has a sheath between the core rope and the outer strand layer, preferably made of a plastic, which has no connection to the plastic matrix.

[0040] The sheath surrounds the core rope in the form of a sheath, which can be produced in particular by an additional process step, and into which the core rope is inserted.

[0041] No connection means that a clear separation is possible between the plastic surrounding the core rope's inner strands and the plastic sheath, which has no connection to the plastic matrix. This is made possible, in particular, by a separation plane formed between the plastic matrix and the plastic sheath. This separation plane creates a sliding plane that allows relative mobility of the outer strands to the core rope in a longitudinal direction of the rope.

[0042] The inventor has found that such a sheathing further improves the relative mobility of the core rope to the outer strand layer, whereby such a rotation-resistant wire rope according to the invention is particularly durable, even under high loads, for example winding and unwinding from a wire rope drum.

[0043] Although not absolutely necessary, it is conceivable that a plastic matrix surrounding the core rope inner strands is formed from a different plastic than the core rope sheath formed from a plastic. In a further embodiment of the invention, the core rope outer strands of the core rope are embedded in the plastic matrix with the core rope outer strand regions facing the core rope inner strands, and the core rope outer strand regions facing away from the core rope inner strands are inserted into a sheath formed from a plastic and arranged between the core rope and the outer strand layer, wherein the sheath has no connection to the plastic matrix and completely surrounds the core rope in a circumferential direction.

[0044] The sheath surrounding the core rope, which in particular has no connection to the plastic matrix, forms a separation plane, thereby creating a sliding plane that enables relative mobility of the outer strands to the core rope in a rope longitudinal direction.

[0045] Advantageously, a particularly fatigue-resistant, in particular bending-fatigue-resistant wire rope is created, which is particularly suitable for use as a running wire rope.

[0046] Conveniently, the core rope is a parallel lay rope.

[0047] In a parallel lay rope, all the wires from which the parallel lay rope is made are stranded in a single process step to form parallel lay strands, which in turn are stranded to form the parallel lay rope.

[0048] In a parallel lay rope, the core outer strands of a core rope are arranged between circumferentially adjacent outer strands of a first outer strand layer due to the manufacturing process.

[0049] The inventor has discovered that a core rope with a 1+8+8 design results in a particularly fracture-resistant and fatigue-resistant rotation-resistant wire rope, with mechanical properties between 30% and 60% better than those of known rotation-resistant wire ropes. A core rope with a 1+8+8 design is a wire rope in which the core rope has eight core rope inner strands (first "+8") surrounding an innermost core rope inner strand ("1"), which are surrounded by eight core rope outer strands (second "+8").

[0050] For other core rope types, surprisingly comparable high strength properties were found, for example for a

[0051] Filler rope of the type 1 + n + n F+ 2n, where n= 3, 4, 5 ... and nF is a number of so-called filler wires, or for a

[0052] Warrington rope of the type 1 + n + (n + n), where n= 3, 4, 5 ..., or for a

[0053] Seale rope of the type 1 + n + n, where n= 3, 4, 5, ..., or for a

[0054] Warrington-Seale rope of type 1 + n + (n + n) + 2n, where n = 3, 4, 5 ... An overview of the aforementioned types and details are described in VDI Guideline 2358 (version: 12 / 2012) in Chapter 6.2.1.2.

[0055] In a further embodiment of the invention, the rotation-resistant wire rope has an actual breaking force F m which is between 3% and 45% higher than the actual breaking force F m a wire rope of the same design in which the core rope inner strands are not embedded in a plastic matrix.

[0056] A wire rope of the same construction means that the two ropes being compared have a core rope of the same construction and an outer strand layer of the same construction. It goes without saying that the rope diameter is also the same.

[0057] The actual breaking force F m of a wire rope increases or decreases linearly with its wire rope cross-sectional area, whereby this relationship applies in particular for a wire rope nominal diameter between 10 mm and 60 mm.

[0058] The inventor has surprisingly found that the actual breaking force F m by means of core rope inner strands which are embedded in a plastic matrix, whereby only the core rope inner strands are completely embedded in the plastic matrix, the values ​​mentioned can be increased in comparison to a comparable wire rope without core rope inner strands embedded in a plastic matrix.

[0059] To determine the percentage increase, an actual breaking force F m1 for a first wire rope Di with a diameter d without core rope inner strands embedded in a plastic matrix, this value being the actual breaking force F m1 of the first wire rope Di is 100% and is a reference value. After that, an actual breaking force F m2 for a second wire rope D2 with a diameter d, this wire rope D2 having core rope inner strands embedded in a plastic matrix. The value for the actual breaking force F m2 of the second rope D2 in relation to the actual breaking force F mi of the first rope Di. This ratio is the relative actual breaking strength.

[0060] According to the invention, the ratio F m2 / F mi between 1.03 and 1.45.

[0061] In one embodiment of the invention, the wire rope has a nominal tensile stress o z of 127 N / mm 2 + / - 10 N / mm 2 a service life in bending cycles that is between 3% and 40% higher than the service life of a wire rope of the same design in which the core rope inner strands are not embedded in a plastic matrix. The nominal tensile stress o z , which is also called rope tension, is defined as a rope tension force S divided by a metallic cross-section, ie the sum of cross-sections of all wires forming the wire rope (source: FEYRER: Drahtseile, K. Feyrer, K.-H. Wehking, 3rd edition, SpringerVieweg, 2018, ISBN: 978-3-642-54295-4, there p. 71 ).

[0062] A service life is defined as the number of bending cycles until a wire rope breaks.

[0063] The so-called 100% discard limit is the number of bending cycles a wire rope can withstand before it can no longer be safely used. Once this discard limit is reached, the wire rope must be replaced.

[0064] The number of bending cycles required to reach 100% discard is always less than the wire rope's service life. The longer the service life and the higher the discard, the greater the wire rope's resistance to bending cycles.

[0065] To determine the fatigue life, a test setup was used according to R. Verreet and J.-M. Teissier's "A new and innovative wire rope bending fatigue machine" (2005, freely available at https: / / www.ropetechnology.com / downloads / brochures / bro_a-new-and-innovative-wire-rope- bending-fatigue-machine.pdf; last accessed on January 24, 2023). A wire rope is guided over a total of five sheaves under a load with a selected nominal tensile stress until the wire rope breaks (see ibid., Figs. 6 to 8).

[0066] The advantage of this test setup is that the broken wire rope has areas that are less severely worn, allowing values ​​such as a specific degree of wear (20%, 40%, 60%, 80%, 100%) to be determined for the broken wire rope (see ibid. in Fig. 9). Thus, the test determines the number of bending cycles for each wire rope area, allowing further safety-relevant parameters of the wire rope, such as a degree of wear, e.g., 100% wear.

[0067] An evaluation of the fatigue strength is carried out according to DIN ISO 4309 (version: 06 / 2013).

[0068] The inventor has surprisingly discovered that the service life and a certain degree of discard maturity can be increased by the aforementioned values ​​by core rope inner strands embedded in a plastic matrix, with only the core rope inner strands being completely embedded in the plastic matrix, compared to a wire rope of the same design without core rope inner strands embedded in a plastic matrix.

[0069] To determine the percentage increase, the discard age AT and the service life Li are determined using the above-mentioned test for a first wire rope Di with a diameter d without core rope inner strands embedded in a matrix, whereby these determined values ​​for the discard age Ai and the service life Li of the first wire rope Di each correspond to 100% and are each a reference value.

[0070] The discard age A2 and service life L2 are then determined using the aforementioned test for a second wire rope D2 with a diameter d, this wire rope D2 having core rope inner strands embedded in a plastic matrix. The values ​​for the discard age A2 and service life L2 of the wire rope D2 are then related to the respective values ​​for the discard age Ai and service life Li of the first rope Di. These relationships correspond to the relative service life and the relative discard age.

[0071] According to the invention, the ratio L2 / LI is between 1.03 and 1.40.

[0072] Similar increases were found for the discard age, i.e. the ratio A2 / AT is also between 1.03 and 1.40.

[0073] Discard maturity A b A2 can be a 100% discard status or a lower level of discard status.

[0074] The rotation-resistant wire rope preferably has an actual breaking force F m which is between 15% and 50% higher than the actual breaking force F m a wire rope of the same design whose core rope is not compacted.

[0075] The inventor has recognized that a compaction of the core rope results in an increase in the actual breaking force F m causes.

[0076] In one embodiment of the invention, the rotation-resistant wire rope has the rotation-resistant wire rope at a nominal tensile stress o z of 127 N / mm 2 + / - 10 N / mm 2 has a service life L and / or a discard age A that is between 3% and 45% higher than the service life L and / or discard age A of a wire rope of the same design whose core rope is not compacted.

[0077] The inventor has found that compaction of the core rope results in an increase in the service life L and the discard age A.

[0078] The core rope's inner strands and outer strands are expediently designed as complete strands, with no wire omitted to create a cavity for accommodating the plastic forming the plastic matrix. This advantageously creates a wire rope with high fatigue strength that also has a particularly high fill level compared to rotation-resistant wire ropes known from the prior art.

[0079] A method according to the invention for producing a rotation-resistant wire rope, in which a first core rope inner strand is surrounded by a plastic sheath and is stranded at a stranding point of a stranding device with further core rope inner strands and core rope outer strands to form a core rope in such a way that only the core rope inner strands are introduced into a plastic matrix, is characterized in that outer strands are stranded with the core rope to form the rotation-resistant wire rope.

[0080] The plastic sheath is designed in such a way that the additional core rope inner strands are completely inserted into it in a circumferential direction at the stranding point, i.e., embedded. The plastic sheath of the first core rope inner strand forms the plastic matrix in a manufactured core rope.

[0081] In one embodiment of the method according to the invention, the core rope is compacted before being stranded with the outer strands to form the rotation-resistant wire rope.

[0082] A lifting device according to the invention with a drum drive, in particular a crawler crane, has a rotation-free wire rope according to the invention, which is designed as a running rope.

[0083] A running rope is a rope which, when used as intended, for example as a load rope for a lifting device, is deflected by rope pulleys or is wound onto or unwound from a rope drum.

[0084] The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings relating to the exemplary embodiments. They show:

[0085] Fig. 1 ad Several embodiments of a rotation-resistant wire rope according to the invention in cross section,

[0086] Fig. 2 a, b relative actual breaking force, relative service life and relative discard date for different wire ropes D D2, D r and D2. A rotation-resistant wire rope 1, shown schematically in cross-section in Fig. 1 a, is designed as a round-strand rope and comprises a core rope 2 designed as a parallel lay rope and a single outer strand layer 3 having sixteen outer strands 4, wherein the outer strands 4 are applied directly to the core rope 2.

[0087] The core rope is designed as a 1+8+8 wire rope and has a first, innermost core rope inner strand 5, which is surrounded by eight additional core rope inner strands 6. A core rope outer strand layer 7 comprises a total of eight core rope outer strands 8.

[0088] The core rope inner strands 5, 6 and the core rope outer strands 8 are compacted in this embodiment.

[0089] The core rope inner strands 5, 6 are inserted into a plastic matrix 9 made of polypropylene (PP) in such a way that all core rope inner strands 5, 6 are completely surrounded by the plastic matrix 9 in the circumferential direction.

[0090] The core rope outer strands 8 are inserted into the plastic matrix 9 with the core rope outer strand regions 10 facing the core rope inner strands 5, 6, i.e., they are inserted only in certain regions. The core rope outer strand regions 101 facing away from the core rope outer strands 8 are not inserted into the plastic matrix 9.

[0091] For reasons of simplified representation, the core rope outer strand areas 10, 101 are separated from each other by a dashed circular line 102 in the exemplary embodiments.

[0092] A rotation-resistant wire rope 1, shown schematically in cross-section in Fig. 1 b, differs from the one shown in Fig. 1 a in that it comprises a sheath 11 made of a plastic material, which completely encloses the core rope 2 in a core rope circumferential direction, like a sleeve. An outer strand layer 3 is applied directly to the sheath 11.

[0093] The sheath 11 can be designed as a further plastic matrix which encloses the core rope outer strand regions 101 facing away from the core rope inner strands 5, 6 and into which the outer strand regions of the outer strands 4 facing the core rope 2 are introduced.

[0094] In the wire rope 1 shown in Fig. 1b, the dashed circular line 102 simultaneously forms a separation plane along which the plastic matrix 10 and the sheath 11 are separated from each other, i.e., they rest loosely against each other without being connected. The core rope 2 of the wire ropes 1 shown in Figs. 1a and 1b is not compacted.

[0095] A rotation-resistant wire rope 1 shown schematically in cross-section in Fig. 1c differs from that shown in Fig. 1a in that a core rope 2 is compacted, creating a smooth and flat core rope surface 12.

[0096] A rotation-resistant wire rope 1 shown schematically in cross-section in Fig. 1d differs from that shown in Fig. 1b in that a core rope 2 is compacted, creating a smooth and flat core rope surface 12.

[0097] For reasons of clarity, not all outer strands 4, core rope inner strands 6, core rope outer strands 8 and core rope outer strand regions 10 facing the core rope inner strands 5, 6 and core rope outer strand regions 101 facing away from the core rope inner strands 5, 6 are provided with a reference symbol in Fig. 1 ad.

[0098] The rotation-resistant wire ropes 1 shown in Fig. 1 a to 1 d are particularly suitable for use as running ropes in a lifting device with a drum drive, in particular a crane such as a crawler crane, a mobile crane, a deck crane of a ship, a ship unloading crane or a tower crane.

[0099] Reference is now made to Fig. 2, where identical or equivalent parts are designated by the same reference number as in Fig. 1 and the letter a is added to the relevant reference number.

[0100] All wire ropes D used to determine the wire rope properties shown in Fig. 2 a, b b D2, D r and D2 have a core rope of construction type 1 + 8 + 8, with the core rope's inner strands and outer strands being compacted prior to stranding to form the core rope. A single outer strand layer comprises 16 outer strands of construction type 1 + 6, i.e., a single core wire ("1") is stranded with six wires ("+6") surrounding the core wire to form the outer strand.

[0101] To form the respective wire rope D D2, D r and D2, the respective core rope and the 16 outer strands are stranded. One rope diameter of each wire rope D 1 ; D2, D r and D2 is 22 mm in this embodiment.

[0102] All core rope strands were compacted into a core rope before being stranded.

[0103] The D2 wire rope differs from the DT wire rope in that one core rope of the D2 wire rope is compacted. Neither of the Di and D2 wire ropes has core rope inner strands embedded in a plastic matrix.

[0104] The wire rope D r differs from the wire rope DT in that only core rope inner strands of a core rope of the wire rope D r are embedded in a plastic matrix. None of the wire ropes DT and D r has a compacted core rope.

[0105] The D2 wire rope differs from the D2 wire rope in that only the inner core strands of the D2 wire rope are embedded in a plastic matrix. Both D2 and D2 wire ropes have a compacted core rope.

[0106] None of the wire ropes D rand D2, core rope outer strands are completely inserted into the plastic matrix in which the core rope inner strands are embedded, but only core rope outer strand regions facing the core rope inner strands are surrounded by plastic in the manner shown in Fig. 1 a, c.

[0107] Outer strands are applied directly to the core rope, i.e. the core rope outer strands and the outer strands lie directly next to each other.

[0108] In a diagram shown in Fig. 2a, the relative actual breaking force for the four wire ropes D b D2, DT and D2 shown.

[0109] The breaking force of the wire rope DT is F m1 , that of the wire rope D2 is F m2 , that of the wire rope D r is F mV and that of the wire rope D2 is F m2 .

[0110] The relative actual breaking force for the wire rope DT is 100% (= ratio F m1 to F m1), i.e. a reference value.

[0111] To determine the relative breaking strength of the wire rope D2, the ratio F m2 to F m1 formed.

[0112] To determine the relative breaking strength of the wire rope D r the ratio F m1 to F m1 To determine the relative breaking strength of the wire rope D2, the ratio F m2 to F m1 formed.

[0113] By embedding core rope inner strands, i.e. only core rope inner strands, in a plastic matrix, an increase in the actual breaking force F mV of the wire rope D r by 8% compared to that of the wire rope DT (F m1) is possible. Surprisingly, the inventor has discovered that, contrary to the teachings of the prior art, complete embedding of a core rope in a plastic matrix is ​​not necessary, but rather complete embedding of the core rope's inner strands is sufficient.

[0114] By compacting the core rope, the actual breaking force F m2 of the wire rope D2 by 31% compared to that of the wire rope DT (F m1 ) possible.

[0115] By using core rope inner strands embedded in a plastic matrix, whereby only the core rope inner strands are completely embedded in the plastic matrix, in combination with a compaction of the core rope, an increase in the actual breaking force F m2 of the wire rope D2 by 41% compared to that of the wire rope Di (F m i) possible.

[0116] In a diagram shown in Fig. 2b, the relative service life and the relative discard age for the four wire ropes D b D2, Di, and D2 are shown. In this example, the discard condition is the so-called 100% discard condition, meaning the wire rope must be replaced for the continued safe operation of a device guiding the wire rope.

[0117] The service life of the wire rope Di is L, that of the wire rope D2 is L2, that of the wire rope D r is L r and that of the wire rope D2 is L2.

[0118] The 100% discard maturity of the DT wire rope is A b that of the wire rope D2 is A2, that of the wire rope D r is A r and that of the wire rope D2 is A2.

[0119] The relative service life of wire rope Di is 100%, while its relative 100% discard age A is 80%. These are reference values ​​obtained by forming the ratios AT to AT or LT to LI. To determine the relative service life of wire rope D2, the ratio L2 to LT is calculated. The relative service lives of the other wire ropes are determined analogously with reference to the service life LT of wire rope D.

[0120] To determine the relative 100% discard age of wire rope D2, the ratio A2 to Ai is calculated. The relative 100% discard age of the other wire ropes is determined in an analogous manner with respect to the 100% discard age AT of wire rope D^.

[0121] For the wire rope D r an increase in the service life L r by 6% compared to that of the wire rope DT, while an increase in the 100% discard maturity A r from 80% to 84%.

[0122] For the wire rope D2, an increase in the service life L2 of 13% compared to that of the wire rope DT was determined, while an increase in the 100% discard maturity A2 from 80% to 90% was determined.

[0123] For the wire rope D2, an increase in service life L2 of 38% compared to that of the wire rope DT was determined, while an increase in the discard period A2 from 80% to 110% was determined.

[0124] Overall, the wire ropes D r and D2a significant increase in relative actual breaking strength, relative fatigue life and relative 100% discard life.

[0125] Surprisingly, despite the increase in the actual breaking force F m A significant increase in service life and 100% discard rate was observed. This is contrary to the expectations of the rope technology expert, since an increase in the actual breaking force F musually leads to a reduction in service life and a reduction in the 100% discard age.

[0126] It was also found that a further improvement of the above-mentioned properties is possible if the wire rope additionally has a sheath surrounding the core rope which has no connection to a plastic matrix in which only the core rope inner strands are embedded.

Claims

Patent claims: 1 . Rotation-resistant wire rope (1 ; D r , D 2 ), especially rotation-free Round strand rope comprising a core rope (2) and outer strands (4) surrounding the core rope, which outer strands form a single outer strand layer (3), characterized in that the core rope (2) comprises a plurality of core rope inner strands (5, 6) which are introduced into a plastic matrix (9) and which are surrounded by core rope outer strands (8) which form a core rope outer strand layer (7).

2. Rotation-free wire rope according to claim 1, characterized in that only the plurality of core rope inner strands (5, 6) of the core rope (2) are completely introduced into the plastic matrix (9).

3. Rotation-free wire rope according to claim 1 or 2, characterized in that the core rope outer strands (8), which are only partially embedded in the plastic matrix (10), lie directly against the outer strands (4) with the core rope outer strand regions (101) facing away from the core rope inner strands (5, 6).

4. Rotation-free wire rope according to one of claims 1 to 3, characterized in that the core rope outer strands (8) of the core rope (2) are introduced into the plastic matrix (9) only with the core rope outer strand regions (10) facing the core rope inner strands (5, 6), and the core rope outer strand regions (101) facing away from the core rope inner strands (5, 6) are not introduced into the plastic matrix.

5. Rotation-free wire rope according to one of claims 1 to 4, characterized in that adjacent core rope outer strands (8) are separated from one another by the plastic matrix (9) which extends from the core rope inner strands (5, 6) in the radial direction of the wire rope (1) to the core rope outer strands (8), wherein the plastic matrix (10) extends in the radial direction of the core rope only so far that the core rope outer strand regions (101) facing away from the core rope inner strands (5,6) are not incorporated into the plastic matrix.

6. Rotation-free wire rope according to one of claims 1 to 5, characterized in that the core rope (2) is compressed.

7. Rotation-free wire rope according to one of claims 1 to 6, characterized in that the outer strands (4) are applied directly to the core rope (2).

8. Rotation-free wire rope according to one of claims 1 to 7, characterized in that the wire rope (1; D r , D2 ) between the core rope (2) and the outer strand layer (4) has a sheath (11) made of a plastic, which has no connection to the plastic matrix (10).

9. Rotation-free wire rope according to one of claims 1 to 8, characterized in that core rope outer strands (8) of the core rope (2) are embedded in the plastic matrix with the core rope outer strand regions (10) facing the core rope inner strands (5, 6) and with the core rope outer strand regions (101) facing away from the core rope inner strands (5, 6) are introduced into a sheath (11) formed from a plastic and arranged between the core rope (2) and the outer strand layer (4), wherein the sheath (11) has no connection to the plastic matrix (10) and completely surrounds the core rope (2) in a circumferential direction.

10. Rotation-free wire rope according to one of claims 1 to 9, characterized in that the core rope (2) is a parallel lay rope. 11 . Rotation-free wire rope according to one of claims 1 to 10, characterized in that the rotation-free wire rope (1 ; D r , D 2 ) an actual breaking force F m which is between 3% and 45% higher than the actual breaking force F m a wire rope (D b D 2 ) of the same design, in which the core rope inner strands are not embedded in a plastic matrix.

12. Rotation-free wire rope according to one of claims 1 to 11, characterized in that the rotation-free wire rope (1; D r , D 2 ) at a nominal tensile stress o z of 127 N / mm 2 + / - 10 N / mm 2 has a service life L and / or a discard age A in bending cycles that is between 3% and 40% higher than the service life L and / or discard age A of a wire rope (D b D 2) of the same design, in which the core rope inner strands are not embedded in a plastic matrix.

13. Rotation-free wire rope according to one of claims 1 to 12, characterized in that the rotation-free wire rope (1 ; D 2 ) an actual breaking force F m which is between 15% and 50% higher than the actual breaking force F m a wire rope (Di ) of the same design, the core rope of which is not compacted.

14. Rotation-free wire rope according to one of claims 1 to 13, characterized in that the rotation-free wire rope (1; D 2 ) at a nominal tensile stress o z of 127 N / mm 2 + / - 10 N / mm 2 has a service life L and / or a discard age A which is between 3% and 45% higher than the service life L and / or discard age A of a wire rope (Di ) of the same design, the core rope of which is not compacted.

15. Rotation-free wire rope according to one of claims 1 to 14, characterized in that the core rope inner strands (5, 6) and the core rope outer strands (8) are designed as complete strands in which no wire is omitted to create a cavity for receiving plastic forming the plastic matrix (10).

16. Method for producing a rotation-resistant wire rope (1 ; D r , D 2 ), in particular a rotation-resistant round strand rope, in which a first Core rope inner strand (5) is surrounded by a plastic sheath and is stranded at a stranding point of a stranding device with further core rope inner strands (6) and core rope outer strands (8) to form a core rope (2) in such a way that only the core rope inner strands (6) are introduced into a plastic matrix, characterized in that outer strands (4) for forming the rotation-resistant wire rope (1; D r , D 2) be stranded with the core rope (2).

17. Method according to claim 16, characterized in that the core rope (2) is twisted before being twisted with the outer strands (4) to form the rotation-resistant wire rope (1; D r , D 2 ) is compressed.

18. Lifting device with a drum drive, in particular a crawler crane, which has a rotation-free wire rope (1 ; D r , D 2 ) according to one of claims 1 to 15, wherein the rotation-free wire rope (1 ; Di , D 2 ) is designed as a running rope.

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