Elevator ropes and their manufacturing methods

Abstract

Provided is a rope for an elevator that suspends a car in the elevator, comprising: a steel core composed of a stranded wire formed by twisting a plurality of steel wires or a single steel wire; a first fiber layer composed of high-strength synthetic fibers disposed on the outer periphery of the steel core; and a first steel wire layer formed by winding a plurality of stranded wires formed by twisting a plurality of steel wires or a single steel wire around the outer periphery of the first fiber layer. According to this rope for an elevator, it is possible to easily manufacture a rope for an elevator that includes high-strength synthetic fibers and has a low ovality.

Description

Technical Field

[0001] The present disclosure relates to an elevator rope for suspending a car in an elevator and a method for manufacturing the same. Background Art

[0002] With the high-rise of buildings, the high-lift of elevators has been continuously developed. In high-lift elevators, since the diameter and length of the elevator ropes used become larger, lightweight and high-strength ropes are required. Therefore, a method of using a light and strong high-strength synthetic fiber in the core of an elevator rope is known.

[0003] In Patent Document 1, a method for manufacturing an elevator rope is disclosed in which a fiber core made of a high-strength synthetic fiber is arranged at the center and a steel strand is wound around the outer periphery thereof.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: International Publication No. 2017 / 064808 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, in the manufacture of a fiber core made of a high-strength synthetic fiber, for example, a large number of high-strength fiber yarns obtained by bundling a plurality of high-strength synthetic fibers having a diameter of several μm to several tens of μm are arranged, bundled, or twisted to form a fiber core, and the overall cross-sectional shape thereof is made circular. At this time, in order for the fiber core to sufficiently bear the tensile load applied to the elevator rope during elevator operation, the high-strength fiber yarns are twisted slightly loosely. However, since the high-strength fiber yarns are thin and soft, the shape is likely to be distorted during loose twisting, and it is not easy to produce a circular core material, and there is a case of ovalization. If the ovality of the core material is high, the ovality of the rope with a steel strand wound around its outer periphery also becomes high, and if the ovality is high, the life of the rope may be shortened.

[0009] Therefore, an object of the present disclosure is to provide an elevator rope and a method for manufacturing the same, which have a structure capable of easily manufacturing an elevator rope having a low ovality and containing a high-strength synthetic fiber.

[0010] Means for Solving the Problems

[0011] The elevator rope of the present disclosure includes: a steel core composed of a steel strand formed by twisting a plurality of steel wires or a single steel wire; a first fiber layer composed of high-strength synthetic fibers disposed on the outer periphery of the steel core; and a first steel wire layer formed by winding a plurality of steel strands formed by twisting a plurality of steel wires or a single steel wire around the outer periphery of the first fiber layer.

[0012] The manufacturing method of the elevator rope of the present disclosure includes the following steps: disposing a plurality of fiber bundles made of high-strength synthetic fibers on the outer periphery of a steel core composed of a stranded wire formed by twisting a plurality of steel wires or a single steel wire to form a first fiber layer; and winding a plurality of stranded wires formed by twisting a plurality of steel wires or a single steel wire on the outer periphery of the first fiber layer to form a first steel wire layer.

[0013] Advantages of the Invention

[0014] According to the elevator rope and its manufacturing method of the present disclosure, an elevator rope containing high-strength synthetic fibers and having a low ovality can be easily manufactured. Description of the Drawings

[0015] Figure 1 It is a cross-sectional view perpendicular to the length direction of the elevator rope of the first embodiment.

[0016] Figure 2 It is a side view showing the state after sequentially cutting through the layers of the elevator rope of the first embodiment.

[0017] Figure 3 It is a cross-sectional view perpendicular to the length direction of the elevator rope of a modified example of the first embodiment.

[0018] Figure 4 It is a side view showing the state after sequentially cutting through the layers of the elevator rope of the first modified example of the first embodiment.

[0019] Figure 5 It is a side view showing the state after sequentially cutting through the layers of the elevator rope of the second modified example of the first embodiment.

[0020] Figure 6 It is a cross-sectional view perpendicular to the length direction of the elevator rope of the second embodiment.

[0021] Figure 7 It is a cross-sectional view perpendicular to the length direction of the elevator rope of a modified example of the second embodiment.

[0022] Figure 8 It is a cross-sectional view perpendicular to the length direction of the elevator rope of the third embodiment.

[0023] Figure 9 It is a cross-sectional view perpendicular to the length direction of the elevator rope of the first modified example of the third embodiment.

[0024] Figure 10 It is a cross-sectional view perpendicular to the length direction of the elevator rope of the second modified example of the third embodiment.

[0025] Figure 11It is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope of the fourth embodiment.

[0026] Figure 12 It is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope of a modified example of the fourth embodiment.

[0027] Figure 13 It is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope of the fifth embodiment.

[0028] Figure 14 It is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope of a modified example of the fifth embodiment.

[0029] Figure 15 It is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope of the sixth embodiment.

[0030] Figure 16 It is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope of a modified example of the sixth embodiment. Detailed Embodiments

[0031] [First Embodiment]

[0032] Hereinafter, the elevator rope 100 of the first embodiment will be described. Figure 1 It is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of the elevator rope 100. Figure 2 It is a side view showing the state after sequentially cutting through the respective layers of the elevator rope 100.

[0033] As Figure 1 and Figure 2 shown, the elevator rope 100 has a steel core 11 and a first fiber layer 12 made of high-strength synthetic fibers disposed on the outer periphery of the steel core 11. Further, a first steel wire layer 13 formed by winding a plurality of first steel strands 13n is provided on the outer periphery of the first fiber layer 12.

[0034] The steel core 11 is composed of a steel strand formed by twisting a plurality of steel wires. The steel core 11 is composed of a core wire 11a and six side wires 11b wound around the outer periphery of the core wire 11a. Both the core wire 11a and the side wires 11b are made of steel wires.

[0035] The first fiber layer 12 is a layer made of high-strength synthetic fibers disposed on the outer periphery of the steel core 11. The first fiber layer 12 is formed by twisting a plurality of fiber bundles, and each fiber bundle is made of high-strength synthetic fibers. As the high-strength synthetic fibers, for example, carbon fiber, glass fiber, poly(p-phenylene benzobisoxazole) (PBO) fiber, aromatic polyamide fiber, polyarylate fiber, or basalt fiber is used. Each fiber bundle can be, for example, a fiber bundle integrated by curing with a resin such as epoxy resin or polyurethane resin, or a fiber bundle coated with a resin.

[0036] The first steel wire layer 13 is formed by winding a plurality of first stranded steel wires 13n, which are formed by twisting a plurality of steel wires, around the outer periphery of the first fiber layer 12. In Figure 1 the example shown, eight first stranded steel wires 13n are wound around the outer periphery of the first fiber layer 12. Each first stranded steel wire 13n has a core wire 13a, nine first side wires 13b wound around the outer periphery of the core wire 13a, and nine second side wires 13c wound around the outer periphery of the first side wires 13b. The core wire 13a, the first side wires 13b, and the second side wires 13c are all made of steel wires. In the first embodiment, the first steel wire layer 13 is located on the outermost layer of the elevator rope 100 and is exposed to the outside.

[0037] When manufacturing the elevator rope 100, first, a plurality of fiber bundles made of high-strength synthetic fibers are arranged around the outer periphery of a steel core 11 formed of a stranded steel wire made of twisting a plurality of steel wires to form a first fiber layer 12. Specifically, a plurality of fiber bundles are twisted in a manner along the outer peripheral surface of the steel core 11 to form the first fiber layer 12. At this time, in order to enable the first fiber layer 12 to fully bear the tensile load applied to the elevator rope, the plurality of fiber bundles are twisted slightly loosely. However, since the steel core 11 is used as the core material, the shape during twisting is not easily distorted, and the first fiber layer 12 is easily formed. After that, a plurality of first stranded steel wires 13n formed by twisting a plurality of steel wires are wound around the outer periphery of the first fiber layer 12 to form the first steel wire layer 13.

[0038] As described above, the elevator rope 100 includes: a steel core 11; a first fiber layer 12 formed of high-strength synthetic fibers arranged around the outer periphery of the steel core 11; and a first steel wire layer 13 formed by winding a plurality of stranded steel wires around the outer periphery of the first fiber layer 12. Thereby, the first fiber layer 12 can be easily formed with the steel core 11 as the core material, and an elevator rope with a low ovality and containing high-strength synthetic fibers can be easily manufactured.

[0039] In addition, the higher the lifting height of the elevator, the more preferably a weight compensation rope (or chain) is provided in the elevator. However, according to the elevator rope 100, by including high-strength synthetic fibers, weight reduction can be achieved, so the number or mass of the weight compensation rope (or chain) can be further reduced or completely removed.

[0040] In addition, in the above first embodiment, the case where the first fiber layer 12 is formed by twisting a plurality of fiber bundles around the outer periphery of the steel core 11 has been described. However, as an alternative, the first fiber layer 12 may be formed by weaving a plurality of fiber bundles, or may be formed by arranging a plurality of fiber bundles substantially parallel and bundling them.

[0041] In addition, in the above-described first embodiment, the structure of the stranded wire constituting the steel core 11 (the number of steel wires, arrangement, etc.) can be appropriately changed. In addition, the number of the first stranded wires 13n constituting the first wire layer 13 and the structure of each first stranded wire 13n (the number of steel wires, arrangement, etc.) can be appropriately changed.

[0042] [First Modification of the First Embodiment]

[0043] Hereinafter, an elevator rope 101 as a first modification of the first embodiment will be described. Figure 3 It is a cross-sectional view showing a cross-section of the elevator rope 101 perpendicular to the length direction. Figure 4 It is a side view showing a state after sequentially cutting each layer of the elevator rope 101.

[0044] As Figure 3 and Figure 4 shown, the elevator rope 101 is different from the first embodiment in that it has a resin-coated layer 18 as the outermost layer. That is, in the elevator rope 100 of the first embodiment, the first wire layer 13 is exposed to the outside as the outermost layer of the elevator rope 100. In contrast, in the elevator rope 101 of this modification, the outer periphery of the first wire layer 13 is covered with the coating layer 18. As a result, the wear resistance of the elevator rope 101 is improved, and the durability is improved. The coating layer 18 enters between adjacent first stranded wires 13n. As the material of the coating layer 18, in order to ensure the traction ability between the rope and the sheave, a resin having a sufficient friction coefficient is used, such as an elastomeric resin, polyurethane, or the like.

[0045] In addition, the higher the lifting height of the elevator, the more preferably a weight compensation rope (or chain) is provided in the elevator. However, according to the elevator rope 101, by including high-strength synthetic fibers, weight reduction can be achieved, and by increasing the friction coefficient between the rope and the sheave, slipping between the rope and the sheave can be suppressed, and stable power transmission can be performed. As a result, the number or mass of the weight compensation ropes (or chains) can be further reduced or completely eliminated.

[0046] [Second Modification of the First Embodiment]

[0047] Hereinafter, an elevator rope 102 as a second modification of the first embodiment will be described. Figure 5 It is a cross-sectional view showing a cross-section of the elevator rope 102 perpendicular to the length direction. The elevator rope 102 is different from the first embodiment in that buffer layers made of resin are provided between the steel core 11 and the first fiber layer 12, and between the first fiber layer 12 and the first wire layer 13, respectively. In the following description, this difference will be described, and the description of the same structure as the first embodiment will be omitted.

[0048] As Figure 5 shown, the elevator rope 102 has a first buffer layer 19a made of resin between the steel core 11 and the first fiber layer 12. Thereby, it is possible to suppress the wear of the first fiber layer 12 caused by the direct contact between the steel core 11 and the first fiber layer 12. In addition, a second buffer layer 19b made of resin is provided between the first fiber layer 12 and the first steel wire layer 13. Thereby, it is possible to suppress the wear of the first fiber layer 12 caused by the direct contact between the first fiber layer 12 and the first steel wire layer 13. As the materials of the first buffer layer 19a and the second buffer layer 19b, resins having wear resistance and low friction, such as polyethylene and polypropylene, are used.

[0049] In addition, in the second modification of the first embodiment, the case where buffer layers made of resin are provided at both places between the steel core 11 and the first fiber layer 12 and between the first fiber layer 12 and the first steel wire layer 13 has been described. However, as an alternative, a buffer layer may be provided at only any one of them. Thereby, it is possible to suppress the wear of the first fiber layer 12 at the portion where the buffer layer is provided. That is, it is sufficient to provide a buffer layer at at least one of the positions between the steel core 11 and the first fiber layer 12 and between the first fiber layer 12 and the first steel wire layer 13.

[0050] [Second Embodiment]

[0051] Hereinafter, the elevator rope 200 of the second embodiment will be described. Figure 6 is a cross-sectional view showing a cross-section of the elevator rope 200 perpendicular to the longitudinal direction. The elevator rope 200 is different from the first embodiment in that the steel core 21 is composed of a single steel wire. In contrast, in the first embodiment, the steel core 11 is composed of a stranded wire formed by twisting a plurality of steel wires. Since it is the same as the first embodiment in other aspects, the description thereof is omitted here.

[0052] In addition, in this second embodiment, a buffer layer may be provided at at least one of the positions between the steel core 21 and the first fiber layer 12 and between the first fiber layer 12 and the first steel wire layer 13.

[0053] [Modification of the Second Embodiment]

[0054] Hereinafter, the elevator rope 201 as a modification of the second embodiment will be described. Figure 7 is a cross-sectional view showing a cross-section of the elevator rope 201 perpendicular to the longitudinal direction. As Figure 7As shown, the elevator rope 201 is different from the second embodiment in that it has a resin coating layer 28 as the outermost layer. That is, in the elevator rope 200 of the second embodiment, the first steel wire layer 13 is exposed to the outside as the outermost layer of the elevator rope 200. In contrast, in the elevator rope 201 of this modification, the outer periphery of the first steel wire layer 13 is covered with the coating layer 28. Thereby, the wear resistance of the elevator rope 201 is improved, and the durability is improved.

[0055] The coating layer 28 enters between adjacent first steel strands 13n. As the material of the coating layer 28, in order to ensure the traction ability with the rope sheave, a resin having a sufficient coefficient of friction is used, such as an elastomer resin, polyurethane, or the like.

[0056] [Third Embodiment]

[0057] Hereinafter, the elevator rope 300 of the third embodiment will be described. Figure 8 It is a cross-sectional view showing a cross-section of the elevator rope 300 perpendicular to the longitudinal direction.

[0058] As Figure 8 shown, the elevator rope 300 has a steel core 31 and a first fiber layer 32 composed of high-strength synthetic fibers arranged on the outer periphery of the steel core 31. In addition, a first steel wire layer 33 formed by winding a plurality of first steel strands 33n is provided on the outer periphery of the first fiber layer 32. Further, a second fiber layer 34 composed of high-strength synthetic fibers arranged on the outer periphery of the first steel wire layer 33 is provided. In addition, a second steel wire layer 35 formed by winding a plurality of second steel strands 35n is provided on the outer periphery of the second fiber layer 34.

[0059] The steel core 31 is composed of a steel strand formed by twisting a plurality of steel wires. The steel core 31 is composed of a core wire and six side wires wound around the outer periphery of the core wire. Both the core wire and the side wires are composed of steel wires.

[0060] The first fiber layer 32 is a layer composed of high-strength synthetic fibers arranged on the outer periphery of the steel core 31. The first fiber layer 32 is formed by twisting a plurality of fiber bundles, and each fiber bundle is composed of high-strength synthetic fibers. As the high-strength synthetic fibers, for example, carbon fiber, glass fiber, poly(p-phenylene benzobisoxazole) (PBO) fiber, aromatic polyamide fiber, polyarylate fiber, or basalt fiber is used. Each fiber bundle can be, for example, a fiber bundle solidified and integrated with a resin such as epoxy resin or polyurethane resin, or a fiber bundle coated with a resin.

[0061] The first steel wire layer 33 is formed by winding a plurality of first steel strands 33n formed by twisting a plurality of steel wires on the outer periphery of the first fiber layer 32. In Figure 8In the example shown, 12 first steel strands 33n are wound around the outer periphery of the first fiber layer 32. Each first steel strand 33n is composed of a core wire and 6 side wires wound around the outer periphery of the core wire. Both the core wire and the side wires are made of steel wires.

[0062] The second fiber layer 34 is a layer composed of high-strength synthetic fibers disposed on the outer periphery of the first steel wire layer 33. The second fiber layer 34 is formed by twisting a plurality of fiber bundles, and each fiber bundle is composed of high-strength synthetic fibers. As the high-strength synthetic fibers, for example, carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aromatic polyamide fibers, polyarylate fibers, or basalt fibers are used. Each fiber bundle can be, for example, a fiber bundle integrated by curing with a resin such as an epoxy resin or a polyurethane resin, or a fiber bundle coated with a resin.

[0063] The second steel wire layer 35 is formed by winding a plurality of second steel strands 35n obtained by twisting a plurality of steel wires around the outer periphery of the second fiber layer 34. In Figure 8 the example shown, 12 second steel strands 35n are wound around the outer periphery of the second fiber layer 34. Each second steel strand 35n has a core wire, 9 first side wires wound around the outer periphery of the core wire, and 9 second side wires wound around the outer periphery of the first side wires. The core wire, the first side wires, and the second side wires are all made of steel wires. In the third embodiment, the second steel wire layer 35 is located on the outermost layer of the elevator rope 300 and is exposed to the outside.

[0064] When manufacturing the elevator rope 300, first, a plurality of fiber bundles composed of high-strength synthetic fibers are disposed on the outer periphery of a steel core 31 composed of a steel strand obtained by twisting a plurality of steel wires to form a first fiber layer 32. Specifically, a plurality of fiber bundles are twisted in a manner along the outer peripheral surface of the steel core 31 to form the first fiber layer 32. At this time, in order to enable the first fiber layer 32 to sufficiently bear the tensile load applied to the elevator rope, the plurality of fiber bundles are twisted slightly loosely. However, since the steel core 31 is used as the core material, the shape during twisting is not easily distorted, and the first fiber layer 32 is easily formed. After that, a plurality of first steel strands 33n obtained by twisting a plurality of steel wires are wound around the outer periphery of the first fiber layer 32 to form a first steel wire layer 33.

[0065] After that, a plurality of fiber bundles composed of high-strength synthetic fibers are disposed on the outer periphery of the first steel wire layer 33 to form a second fiber layer 34. Specifically, a plurality of fiber bundles are twisted in a manner along the outer peripheral surface of the first steel wire layer 33 to form the second fiber layer 34. After that, a plurality of second steel strands 35n obtained by twisting a plurality of steel wires are wound around the outer periphery of the second fiber layer 34 to form a second steel wire layer 35.

[0066] As described above, the elevator rope 300 includes: a steel core 31; a first fiber layer 32 composed of high-strength synthetic fibers disposed on the outer periphery of the steel core 31; and a first steel wire layer 33 formed by winding a plurality of steel strands around the outer periphery of the first fiber layer 32. Thus, the first fiber layer 32 can be easily formed with the steel core 31 as the core material, and an elevator rope with low ovality and containing high-strength synthetic fibers can be easily manufactured. In addition, the elevator rope 300 further includes: a second fiber layer 34 composed of high-strength synthetic fibers disposed on the outer periphery of the first steel wire layer 33; and a second steel wire layer 35 formed by winding a plurality of steel strands around the outer periphery of the second fiber layer 34. That is, two fiber layers are provided. Thus, the use amount of high-strength synthetic fibers can be increased to achieve weight reduction.

[0067] In addition, the higher the lifting height of the elevator, the more preferably a weight compensation rope (or chain) is provided in the elevator. However, according to the elevator rope 300, by using multiple fiber layers to contain more high-strength synthetic fibers, weight reduction can be achieved compared with conventional elevator ropes, and the number or mass of the weight compensation ropes (or chains) can be further reduced or completely removed.

[0068] In addition, in the above-described third embodiment, the case where the first fiber layer 32 and the second fiber layer 34 are formed by twisting a plurality of fiber bundles around the outer periphery of the steel core 31 has been described. However, as an alternative, the first fiber layer 32 and the second fiber layer 34 may be formed by braiding a plurality of fiber bundles, or may be formed by arranging a plurality of fiber bundles substantially parallel and bundling them.

[0069] In addition, in the above-described third embodiment, the structure of the steel strands constituting the steel core 31 (the number of steel wires, configuration, etc.) can be appropriately changed. In addition, the number of the first steel strands 33n constituting the first steel wire layer 33 and the structure of each first steel strand 33n (the number of steel wires, configuration, etc.) can be appropriately changed. In addition, the number of the second steel strands 35n constituting the second steel wire layer 35 and the structure of each second steel strand 35n (the number of steel wires, configuration, etc.) can be appropriately changed.

[0070] In addition, in the above-described third embodiment, a buffer layer made of resin can be provided at least at one of the positions between the steel core 31 and the first fiber layer 32, between the first fiber layer 32 and the first steel wire layer 33, between the first steel wire layer 33 and the second fiber layer 34, and between the second fiber layer 34 and the second steel wire layer 35. Thus, wear of the first fiber layer 32 or the second fiber layer 34 can be suppressed at the portion where the buffer layer is provided. At this time, as the material of the buffer layer, a resin having abrasion resistance and low friction, such as polyethylene and polypropylene, can be used.

[0071] [First Variation of the Third Embodiment]

[0072] Next, the elevator rope 301 as a modification of the third embodiment will be described. Figure 9 It is a cross-sectional view showing a cross-section of the elevator rope 301 perpendicular to the longitudinal direction. As Figure 9 shown, the elevator rope 301 is different from the third embodiment in that it has a resin coating layer 38 as the outermost layer. That is, in the elevator rope 300 of the third embodiment, the second steel wire layer 35 is exposed to the outside as the outermost layer of the elevator rope 300. In contrast, in the elevator rope 301 of this modification, the outer periphery of the second steel wire layer 35 is covered with the coating layer 38. As a result, the wear resistance of the elevator rope 301 is improved, and the durability is improved.

[0073] The coating layer 38 enters between adjacent second steel strands 35n. As the material of the coating layer 38, in order to ensure the traction ability with the sheave, a resin having a sufficient coefficient of friction is used, such as an elastomer resin, polyurethane, or the like.

[0074] In addition, the higher the lifting height of the elevator, the more preferably a weight compensation rope (or chain) is provided in the elevator. However, according to the elevator rope 301, by containing more high-strength synthetic fibers in the plurality of fiber layers, it is possible to achieve weight reduction compared with conventional elevator ropes, and it is possible to suppress slipping with the sheave by increasing the coefficient of friction with the sheave, and stable power transmission can be performed. As a result, the number or mass of the weight compensation ropes (or chains) can be further reduced or completely eliminated.

[0075] [Second Modification of the Third Embodiment]

[0076] Next, the elevator rope 302 as a modification of the third embodiment will be described. Figure 10 It is a cross-sectional view showing a cross-section of the elevator rope 302 perpendicular to the longitudinal direction. As Figure 10 shown, the elevator rope 302 is different from the third embodiment in that it has a resin coating body 39 that covers each first steel strand 33n of the first steel wire layer 33, and there is no substantial difference in other aspects. As a result, it is possible to suppress the wear of the first fiber layer 32 caused by the direct contact between the first fiber layer 32 and the first steel wire layer 33. In addition, it is possible to suppress the wear of the second fiber layer 34 caused by the direct contact between the first steel wire layer 33 and the second fiber layer 34. As the material of the coating body 49, a resin having wear resistance and low friction, such as polyethylene or polypropylene, is used.

[0077] [Fourth Embodiment]

[0078] Next, the elevator rope 400 of the fourth embodiment will be described. Figure 11FIG. 0 is a cross-sectional view showing a cross-section of the elevator rope 400 perpendicular to the longitudinal direction. The elevator rope 400 is different from the third embodiment in that the steel core 41 is composed of a single steel wire. In contrast, in the third embodiment, the steel core 31 is composed of a stranded wire formed by twisting a plurality of steel wires. Since other aspects are the same as those of the third embodiment, the description thereof is omitted here.

[0079] [Modification of the Fourth Embodiment]

[0080] Hereinafter, an elevator rope 401 as a modification of the fourth embodiment will be described. Figure 12 FIG. 8 is a cross-sectional view showing a cross-section of the elevator rope 401 perpendicular to the longitudinal direction. As Figure 12 shown, the elevator rope 401 is different from the fourth embodiment in that it has a resin coating layer 48 as the outermost layer. That is, in the elevator rope 400 of the fourth embodiment, the second steel wire layer 35 is exposed to the outside as the outermost layer of the elevator rope 400. In contrast, in the elevator rope 401 of this modification, the outer periphery of the second steel wire layer 35 is covered with the coating layer 48. Thereby, the wear resistance of the elevator rope 401 is improved and the durability is improved.

[0081] The coating layer 48 enters between adjacent second stranded wires 35n. As the material of the coating layer 48, in order to ensure the traction ability between the rope and the sheave, a resin having a sufficient friction coefficient, such as an elastomer resin, polyurethane, etc., is used.

[0082] [Fifth Embodiment]

[0083] Hereinafter, an elevator rope 500 of the fifth embodiment will be described. Figure 13 FIG. 21 is a cross-sectional view showing a cross-section of the elevator rope 500 perpendicular to the longitudinal direction.

[0084] As Figure 13 shown, the elevator rope 500 has: a steel core 51; a first fiber layer 52 composed of high-strength synthetic fibers disposed on the outer periphery of the steel core 51; and a first steel wire layer 53 formed by winding a plurality of first stranded wires 53n around the outer periphery of the first fiber layer 52. In addition, it has: a second fiber layer 54 composed of high-strength synthetic fibers disposed on the outer periphery of the first steel wire layer 53; and a second steel wire layer 55 formed by winding a plurality of second stranded wires 55n around the outer periphery of the second fiber layer 54. Moreover, it has: a third fiber layer 56 composed of high-strength synthetic fibers disposed on the outer periphery of the second steel wire layer 55; and a third steel wire layer 57 formed by winding a plurality of third stranded wires 57n around the outer periphery of the third fiber layer 56.

[0085] The steel core 51 is composed of a steel strand formed by twisting multiple steel wires. The steel core 51 is composed of a core wire and six side wires wound around the outer periphery of the core wire. Both the core wire and the side wires are composed of steel wires.

[0086] The first fiber layer 52 is a layer composed of high-strength synthetic fibers disposed on the outer periphery of the steel core 51. The first fiber layer 52 is formed by twisting multiple fiber bundles, and each fiber bundle is composed of high-strength synthetic fibers. As the high-strength synthetic fibers, for example, carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aramid fibers, polyarylate fibers, or basalt fibers are used. Each fiber bundle can be, for example, a fiber bundle integrated by curing with a resin such as epoxy resin or polyurethane resin, or a fiber bundle coated with a resin.

[0087] The first steel wire layer 53 is formed by winding multiple first steel strands 53n, each formed by twisting multiple steel wires, around the outer periphery of the first fiber layer 52. In Figure 13 the example shown, 12 first steel strands 53n are wound around the outer periphery of the first fiber layer 52. Each first steel strand 53n is composed of a core wire and six side wires wound around the outer periphery of the core wire. Both the core wire and the side wires are composed of steel wires.

[0088] The second fiber layer 54 is a layer composed of high-strength synthetic fibers disposed on the outer periphery of the first steel wire layer 53. The second fiber layer 54 is formed by twisting multiple fiber bundles, and each fiber bundle is composed of high-strength synthetic fibers. As the high-strength synthetic fibers, for example, carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aramid fibers, polyarylate fibers, or basalt fibers are used. Each fiber bundle can be, for example, a fiber bundle integrated by curing with a resin such as epoxy resin or polyurethane resin, or a fiber bundle coated with a resin.

[0089] The second steel wire layer 55 is formed by winding multiple second steel strands 55n, each formed by twisting multiple steel wires, around the outer periphery of the second fiber layer 54. In Figure 13 the example shown, 20 second steel strands 55n are wound around the outer periphery of the second fiber layer 54. Each second steel strand 55n has a core wire, nine first side wires wound around the outer periphery of the core wire, and nine second side wires wound around the outer periphery of the first side wires. The core wire, the first side wires, and the second side wires are all composed of steel wires.

[0090] The third fiber layer 56 is a layer composed of high-strength synthetic fibers disposed on the outer periphery of the second steel wire layer 55. The third fiber layer 56 is formed by twisting a plurality of fiber bundles, and each fiber bundle is composed of high-strength synthetic fibers. As the high-strength synthetic fibers, for example, carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aramid fibers, polyarylate fibers, or basalt fibers are used. Each fiber bundle can be, for example, a fiber bundle solidified and integrated with a resin such as epoxy resin or polyurethane resin, or a fiber bundle coated with a resin.

[0091] The third steel wire layer 57 is formed by winding a plurality of third stranded steel wires 57n formed by twisting a plurality of steel wires around the outer periphery of the third fiber layer 56. In Figure 13 the example shown, 15 third stranded steel wires 57n are wound around the outer periphery of the third fiber layer 56. Each third stranded steel wire 57n has a core wire, nine first side wires wound around the outer periphery of the core wire, and nine second side wires wound around the outer periphery of the first side wires. The core wire, the first side wires, and the second side wires are all composed of steel wires. In the fifth embodiment, the third steel wire layer 57 is located on the outermost layer of the elevator rope 500 and is exposed to the outside.

[0092] When manufacturing the elevator rope 500, first, a plurality of fiber bundles composed of high-strength synthetic fibers are disposed on the outer periphery of a steel core 51 formed by twisting a plurality of steel wires to form a first fiber layer 52. Specifically, a plurality of fiber bundles are twisted along the outer peripheral surface of the steel core 51 to form the first fiber layer 52. At this time, in order to enable the first fiber layer 52 to sufficiently bear the tensile load applied to the elevator rope, the plurality of fiber bundles are twisted slightly loosely. However, since the steel core 51 is used as the core material, the shape during twisting is not easily distorted, and the first fiber layer 52 is easily formed. After that, a plurality of first stranded steel wires 53n formed by twisting a plurality of steel wires are wound around the outer periphery of the first fiber layer 52 to form a first steel wire layer 53.

[0093] After that, a plurality of fiber bundles composed of high-strength synthetic fibers are disposed on the outer periphery of the first steel wire layer 53 to form a second fiber layer 54. Specifically, a plurality of fiber bundles are twisted along the outer peripheral surface of the first steel wire layer 53 to form the second fiber layer 54. In addition, a plurality of second stranded steel wires 55n formed by twisting a plurality of steel wires are wound around the outer periphery of the second fiber layer 54 to form a second steel wire layer 55.

[0094] After that, a plurality of fiber bundles composed of high-strength synthetic fibers are disposed on the outer periphery of the second steel wire layer 55 to form a third fiber layer 56. Specifically, a plurality of fiber bundles are twisted along the outer peripheral surface of the second steel wire layer 55 to form the third fiber layer 56. In addition, a plurality of third stranded steel wires 57n formed by twisting a plurality of steel wires are wound around the outer periphery of the third fiber layer 56 to form a third steel wire layer 57.

[0095] As described above, the elevator rope 500 includes: a steel core 51; a first fiber layer 52 composed of high-strength synthetic fibers disposed on the outer periphery of the steel core 51; and a first steel wire layer 53 formed by winding a plurality of steel strands around the outer periphery of the first fiber layer 52. Thus, the first fiber layer 52 can be easily formed with the steel core 51 as a core material, and an elevator rope containing high-strength synthetic fibers can be easily manufactured. In addition, the elevator rope 500 further includes: a second fiber layer 54 composed of high-strength synthetic fibers disposed on the outer periphery of the first steel wire layer 53; and a second steel wire layer 55 formed by winding a plurality of steel strands around the outer periphery of the second fiber layer 54. In addition, it further includes: a third fiber layer 56 composed of high-strength synthetic fibers disposed on the outer periphery of the second steel wire layer 55; and a third steel wire layer 57 formed by winding a plurality of steel strands around the outer periphery of the third fiber layer 56. That is, three fiber layers are provided. Thus, the use amount of high-strength synthetic fibers can be increased to achieve weight reduction.

[0096] In addition, the higher the lifting height of the elevator, the more preferably a weight compensation rope (or chain) is provided in the elevator. However, according to the elevator rope 500, by using multiple fiber layers to contain more high-strength synthetic fibers, weight reduction can be achieved compared with conventional elevator ropes, and the number or mass of the weight compensation ropes (or chains) can be further reduced or completely eliminated.

[0097] In addition, in the above-described fifth embodiment, the case where the first fiber layer 52 and the second fiber layer 54 are formed by twisting a plurality of fiber bundles on the outer periphery of the steel core 51 has been described. However, as an alternative, the first fiber layer 52 and the second fiber layer 54 may be formed by braiding a plurality of fiber bundles, or may be formed by arranging a plurality of fiber bundles substantially parallel and bundling them.

[0098] In addition, in the above-described fifth embodiment, the structure of the steel strands constituting the steel core 51 (the number of steel wires, the arrangement, etc.) can be appropriately changed. In addition, the number of the first steel strands 53n constituting the first steel wire layer 53 and the structure of each first steel strand 53n (the number of steel wires, the arrangement, etc.) can be appropriately changed. In addition, the number of the second steel strands 55n constituting the second steel wire layer 55 and the structure of each second steel strand 55n (the number of steel wires, the arrangement, etc.) can be appropriately changed. In addition, the number of the third steel strands 57n constituting the third steel wire layer 57 and the structure of each third steel strand 57n (the number of steel wires, the arrangement, etc.) can be appropriately changed.

[0099] In addition, in the above-mentioned fifth embodiment, a buffer layer made of resin may also be provided between the first fiber layer 52 and the first steel wire layer 53. Thereby, the wear of the first fiber layer 52 caused by the direct contact between the first fiber layer 52 and the first steel wire layer 53 can be suppressed. For the same reason, a buffer layer made of resin may also be provided between the first steel wire layer 53 and the second fiber layer 54, and between the second fiber layer 54 and the second steel wire layer 55. In addition, a buffer layer made of resin may also be provided between the second steel wire layer 55 and the third fiber layer 56, and between the third fiber layer 56 and the third steel wire layer 57. Additionally, as the material of the buffer layer, a resin having abrasion resistance and low friction, such as polyethylene, polypropylene, etc., can be used.

[0100] In addition, in the above-mentioned fifth embodiment, a buffer layer made of resin may be provided at least at one location between the steel core 51 and the first fiber layer 52, between the first fiber layer 52 and the first steel wire layer 53, between the first steel wire layer 53 and the second fiber layer 54, between the second fiber layer 54 and the second steel wire layer 55, between the second steel wire layer 55 and the third fiber layer 56, and between the third fiber layer 56 and the third steel wire layer 57. Thereby, the wear of the first fiber layer 52, the second fiber layer 54, or the third fiber layer 56 can be suppressed at the portion where the buffer layer is provided. At this time, as the material of the buffer layer, a resin having abrasion resistance and low friction, such as polyethylene, polypropylene, etc., can be used.

[0101] [Modification of the Fifth Embodiment]

[0102] Hereinafter, an elevator rope 501 as a modification of the fifth embodiment will be described. Figure 14 is a cross-sectional view showing a cross-section of the elevator rope 501 perpendicular to the longitudinal direction. As Figure 14 shown, the elevator rope 501 is different from the fifth embodiment in that it has a resin coating layer 58 as the outermost layer. That is, in the elevator rope 500 of the fifth embodiment, the third steel wire layer 57 is exposed to the outside as the outermost layer of the elevator rope 500. In contrast, in the elevator rope 501 of this modification, the outer periphery of the third steel wire layer 57 is covered with the coating layer 58. Thereby, the abrasion resistance of the elevator rope 501 is improved and the durability is improved.

[0103] The coating layer 58 enters between adjacent third steel strands 57n. As the material of the coating layer 58, in order to ensure the traction ability with the rope pulley, a resin having a sufficient friction coefficient, such as an elastomer resin, polyurethane, etc., is used.

[0104] [Sixth Embodiment]

[0105] Hereinafter, an elevator rope 600 of the sixth embodiment will be described.Figure 15 It is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of the elevator rope 600. The elevator rope 600 is different from the fifth embodiment in that the steel core 61 is composed of a single steel wire. In contrast, in the fifth embodiment, the steel core 51 is composed of a stranded wire formed by twisting a plurality of steel wires. Since it is the same as the fifth embodiment in other aspects, the description thereof is omitted here.

[0106] [Modification of the Sixth Embodiment]

[0107] Hereinafter, the elevator rope 601 as a modification of the sixth embodiment will be described. Figure 16 It is a cross-sectional view showing a cross-section perpendicular to the longitudinal direction of the elevator rope 601. As Figure 16 shown, the elevator rope 601 is different from the sixth embodiment in that it has a resin coating layer 68 as the outermost layer. That is, in the elevator rope 600 of the sixth embodiment, the third steel wire layer 57 is exposed to the outside as the outermost layer of the elevator rope 600. In contrast, in the elevator rope 601 of this modification, the outer periphery of the third steel wire layer 57 is covered with the coating layer 68. Thereby, the wear resistance of the elevator rope 601 is improved and the durability is improved.

[0108] The coating layer 68 enters between the adjacent third stranded wires 57n. As the material of the coating layer 68, in order to ensure the traction ability with the rope pulley, a resin having a sufficient friction coefficient is used, such as an elastomer resin, polyurethane, etc.

[0109] In the above embodiments, the case where the number of fiber layers is 1, 2, or 3 has been described, but the number of fiber layers can be appropriately increased according to the degree of increase in the outer diameter of the elevator rope. At this time, it is preferable to provide a steel wire layer on the outer periphery of each fiber layer.

[0110] Reference Numeral Explanation

[0111] 11, 21, 31, 41, 51, 61: Steel core;

[0112] 11a, 13a: Core wire;

[0113] 11b: Side wire;

[0114] 13b: First side wire;

[0115] 13c: Second side wire;

[0116] 12, 32, 52: First fiber layer;

[0117] 13, 33, 53: First steel wire layer;

[0118] 13n, 33n, 53n: First stranded wire;

[0119] 18, 28, 38, 48, 58, 68: Coating layer;

[0120] 19a: First buffer layer;

[0121] 19b: Second buffer layer;

[0122] 34, 54: Second fiber layer;

[0123] 35, 55: Second steel wire layer;

[0124] 35n, 55n: Second steel strand;

[0125] 39: Coating body;

[0126] 56: Third fiber layer;

[0127] 57: Third steel wire layer;

[0128] 57n: Third steel strand;

[0129] 100, 101, 200, 201, 300, 301, 400, 401, 500, 501, 600, 601: Elevator ropes.

Claims

1. An elevator rope, comprising: A steel core composed of a stranded wire formed by twisting multiple steel wires or a single steel wire; A first fiber layer composed of high-strength synthetic fibers disposed on the outer periphery of the steel core; A first steel wire layer formed by winding multiple stranded wires formed by twisting multiple steel wires or a single steel wire around the outer periphery of the first fiber layer; A second fiber layer composed of high-strength synthetic fibers disposed on the outer periphery of the first steel wire layer; and A second steel wire layer formed by winding multiple stranded wires formed by twisting multiple steel wires or a single steel wire around the outer periphery of the second fiber layer.

2. The elevator rope according to claim 1, wherein: A buffer layer made of resin is provided at least at one of the positions between the steel core and the first fiber layer and between the first fiber layer and the first steel wire layer.

3. The elevator rope according to claim 1, wherein: A buffer layer made of resin is provided at least at one of the positions between the first steel wire layer and the second fiber layer and between the second fiber layer and the second steel wire layer.

4. The elevator rope according to claim 1, wherein: The elevator rope further comprises: A third fiber layer composed of high-strength synthetic fibers disposed on the outer periphery of the second steel wire layer; and A third steel wire layer formed by winding multiple stranded wires formed by twisting multiple steel wires or a single steel wire around the outer periphery of the third fiber layer.

5. The elevator rope according to claim 3, wherein: The elevator rope further comprises: A third fiber layer composed of high-strength synthetic fibers disposed on the outer periphery of the second steel wire layer; and A third steel wire layer formed by winding multiple stranded wires formed by twisting multiple steel wires or a single steel wire around the outer periphery of the third fiber layer.

6. The elevator rope according to claim 4, wherein: A buffer layer made of resin is provided at least at one of the positions between the second steel wire layer and the third fiber layer and between the third fiber layer and the third steel wire layer.

7. The elevator rope according to claim 5, wherein: A buffer layer made of resin is provided at least at one of the positions between the second steel wire layer and the third fiber layer and between the third fiber layer and the third steel wire layer.

8. The elevator rope according to any one of claims 1 to 7, wherein: The elevator rope has a resin coating layer as the outermost layer.

9. A method for manufacturing an elevator rope, comprising the following steps: Disposing multiple fiber bundles composed of high-strength synthetic fibers on the outer periphery of a steel core composed of a stranded wire formed by twisting multiple steel wires or a single steel wire to form a first fiber layer; Winding multiple stranded wires formed by twisting multiple steel wires or a single steel wire around the outer periphery of the first fiber layer to form a first steel wire layer; Disposing multiple fiber bundles composed of high-strength synthetic fibers on the outer periphery of the first steel wire layer to form a second fiber layer; and Winding multiple stranded wires formed by twisting multiple steel wires or a single steel wire around the outer periphery of the second fiber layer to form a second steel wire layer.

10. The manufacturing method of the elevator rope according to claim 9, wherein, the manufacturing method of the elevator rope further includes the following steps: arranging a plurality of fiber bundles made of high-strength synthetic fibers on the outer periphery of the second wire layer to form a third fiber layer; and winding a plurality of stranded steel wires formed by twisting a plurality of steel wires or a single steel wire on the outer periphery of the third fiber layer to form a third wire layer.

11. The manufacturing method of the elevator rope according to claim 9 or 10, wherein, the manufacturing method of the elevator rope further includes the following step: covering a covering body made of resin to form a covering layer as the outermost layer.

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