Rope for elevator and elevator device

Abstract

In this elevator rope, a core wire has: an inner layer; a plurality of fiber outer strands disposed on the outer periphery of the inner layer; and a plurality of sub-strand assemblies disposed on the outer periphery of the inner layer. Each outer-layer strand is disposed between adjacent inner-layer strands on the outer periphery of the inner layer. Each sub-strand assembly has a plurality of fiber sub-strands arranged along the same circumference centered on the center of the inner layer. Each of the sub-strand assemblies is disposed between adjacent outer strands.

Description

Technical Field

[0001] The present disclosure relates to an elevator rope and an elevator device. Background Art

[0002] In the conventional steel wire rope, a plurality of steel strands are twisted around the outer periphery of a core wire. The core wire has three core strands and three auxiliary strands. Each core strand is formed by bundling a plurality of synthetic fibers (for example, refer to Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-170323 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the conventional steel wire rope as described above, there are many gaps between the outer periphery of the core wire and the layer of the plurality of steel strands. Therefore, the shape of the cross section perpendicular to the longitudinal direction of the steel wire rope is easily deformed.

[0008] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide an elevator rope and an elevator apparatus capable of further stabilizing the shape of a cross section of a core wire perpendicular to the longitudinal direction.

[0009] Means for solving problems

[0010] The elevator rope disclosed in the present invention comprises: a core wire; and a plurality of steel strands twisted around the outer circumference of the core wire, the core wire having: an inner layer formed by bundling a plurality of inner layer strands made of fibers; a plurality of outer layer strands made of fibers arranged around the outer circumference of the inner layer; and a plurality of sub-strand assemblies arranged around the outer circumference of the inner layer, when observing a cross section of the core wire perpendicular to the length direction, each outer layer strand is arranged between adjacent inner layer strands on the outer circumference of the inner layer, each sub-strand assembly having a plurality of fiber sub-strands, the plurality of fiber sub-strands being arranged along the same circumference centered on the center of the inner layer, and each sub-strand assembly being arranged between adjacent outer layer strands.

[0011] Effects of the Invention

[0012] According to the present disclosure, the shape of the cross section of the core wire perpendicular to the longitudinal direction can be further stabilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic configuration diagram showing the elevator apparatus according to the first embodiment.

[0014] Figure 2 It is along Figure 1A cross-sectional view of the main rope of the II-II line.

[0015] Figure 3 This is a cross-sectional view of the main rope according to the second embodiment.

[0016] Figure 4 This is a cross-sectional view of the main rope according to the third embodiment.

[0017] Figure 5 This is a cross-sectional view of a main rope according to the fourth embodiment. DETAILED DESCRIPTION

[0018] Hereinafter, embodiments will be described with reference to the drawings.

[0019] Implementation method 1.

[0020] Figure 1 This is a schematic structural diagram showing an elevator apparatus according to Embodiment 1. In the figure, a machine base 2 is fixed to the top of a hoistway 1. A traction machine 3 is provided on the machine base 2.

[0021] The hoisting machine 3 has a driving sheave 4, a hoisting machine motor 5, and a hoisting machine brake (not shown). The hoisting machine motor 5 rotates the driving sheave 4. The hoisting machine brake keeps the driving sheave 4 stationary. In addition, the hoisting machine brake brakes the rotation of the driving sheave 4.

[0022] A plurality of main ropes 6 serving as elevator ropes are respectively hung around the driving sheave 4. Figure 1 In the figure, only one main rope 6 is shown. A plurality of sheave grooves (not shown) are provided on the outer periphery of the driving sheave 4. Each main rope 6 is inserted into a corresponding sheave groove.

[0023] A first rope end assembly 7 and a second rope end assembly 8 are provided at the top of the hoistway 1. Each main rope 6 has a first end 6a and a second end 6b. Each first end 6a is connected to the first rope end assembly 7. Each second end 6b is connected to the second rope end assembly 8.

[0024] The car 9 and the counterweight 10 are suspended in the hoistway 1 by means of a plurality of main ropes 6. In addition, the car 9 and the counterweight 10 are raised and lowered in the hoistway 1 by rotating the drive sheave 4.

[0025] A pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown) are provided in the hoistway 1. The pair of car guide rails guide the raising and lowering of the car 9. The pair of counterweight guide rails guide the raising and lowering of the counterweight 10.

[0026] A first car hanging pulley 11a and a second car hanging pulley 11b are provided at the lower portion of the car 9. A counterweight hanging pulley 12 is provided at the upper portion of the counterweight 10.

[0027] The plurality of main ropes 6 are sequentially wound around the first car hanging sheave 11a, the second car hanging sheave 11b, the driving sheave 4, and the counterweight hanging sheave 12 from the first rope end assembly 7. That is, the roping method of the elevator apparatus of Embodiment 1 is a 2:1 roping method.

[0028] Figure 2 It is along Figure 1 2 is a cross-sectional view of the main rope 6 taken along line II-II, showing a cross section of the main rope 6 perpendicular to the length direction.

[0029] The main rope 6 includes a core wire 21 and a plurality of steel strands 22. The plurality of steel strands 22 are twisted around the outer periphery of the core wire 21. In this example, twelve steel strands 22 are used. The diameter of each steel strand 22 is smaller than that of the core wire 21.

[0030] Each steel strand 22 has a plurality of steel wires, including a central wire 23 , a plurality of middle wires 24 , and a plurality of outer wires 25 .

[0031] The center wire 23 is arranged at the center of the cross section perpendicular to the longitudinal direction of the steel strand 22. A plurality of intermediate wires 24 are twisted around the outer periphery of the center wire 23. In this example, nine intermediate wires 24 are used.

[0032] A plurality of outer layer wires 25 are twisted around the outer periphery of the intermediate layer composed of a plurality of intermediate wires 24. In this example, nine outer layer wires 25 are used. That is, in each steel strand 22, the number of intermediate wires 24 and the number of outer layer wires 25 are the same.

[0033] The diameter of each intermediate element wire 24 is smaller than the diameter of the central element wire 23. In addition, the diameter of each intermediate element wire 24 is smaller than the diameter of each outer layer element wire 25. The diameter of each outer layer element wire 25 is the same as the diameter of the central element wire 23.

[0034] Furthermore, when the loads of the car 9 and the counterweight 10 actually act on the main ropes 6 , each steel strand 22 is pressed against the outer periphery of the core wire 21 .

[0035] The core wire 21 includes an inner layer 26 , a plurality of outer layer strands 27 made of fibers, and a plurality of sub-strand assemblies 28 .

[0036] The inner layer 26 is arranged at the center of the cross section of the core wire 21 perpendicular to the longitudinal direction of the core wire 21. In addition, the inner layer 26 is formed by bundling a plurality of inner layer strands 29 made of fibers. The plurality of inner layer strands 29 are twisted together and bundled. In this example, the number of the plurality of inner layer strands 29 is three.

[0037] The cross-sectional shape of each inner layer strand 29 in a state where no load acts on the main rope 6 is circular.

[0038] The plurality of outer layer strands 27 are arranged on the outer periphery of the inner layer 26. The plurality of outer layer strands 27 are twisted on the outer periphery of the inner layer 26. In this example, the number of the plurality of outer layer strands 27 is the same as the number of the plurality of inner layer strands 29, that is, three.

[0039] The cross-sectional shape of each outer layer strand 27 in a state where no load acts on the main rope 6 is circular.

[0040] When observing the cross section perpendicular to the longitudinal direction of the core wire 21, each outer layer strand 27 is arranged between adjacent inner layer strands 29 on the outer periphery of the inner layer 26. That is, each outer layer strand 27 partially enters a recessed portion formed between adjacent inner layer strands 29 on the outer periphery of the inner layer 26 and contacts the outer peripheries of two adjacent inner layer strands 29.

[0041] The plurality of sub-strand assemblies 28 are arranged on the outer periphery of the inner layer 26. In addition, the plurality of sub-strand assemblies 28 are twisted on the outer periphery of the inner layer 26. In this example, the number of the plurality of sub-strand assemblies 28 is the same as the number of the plurality of inner layer strands 29, that is, 3. The plurality of outer layer strands 27 and the plurality of sub-strand assemblies 28 are alternately arranged on the outer periphery of the inner layer 26.

[0042] Each strand assembly 28 has a plurality of fiber strands 30. In this example, the number of the plurality of strands 30 in each strand assembly 28 is three.

[0043] The cross-sectional shape of each strand 30 in a state where no load acts on the main rope 6 is circular.

[0044] When the cross section of the core wire 21 perpendicular to the longitudinal direction is viewed, the plurality of strands 30 of each strand assembly 28 are arranged along the same circumference centered on the center of the inner layer 26 .

[0045] When the cross section perpendicular to the longitudinal direction of the core wire 21 is viewed, each sub-strand assembly 28 is disposed between adjacent outer layer strands 27. That is, each sub-strand assembly 28 is filled between adjacent outer layer strands 27.

[0046] Each inner layer strand 29, each outer layer strand 27, and each sub-strand 30 is formed by twisting a plurality of yarns.

[0047] When the twist shrinkage of each inner layer strand 29 is X1, the twist shrinkage of each outer layer strand 27 is X2, and the twist shrinkage of each sub-strand 30 is X3, X1>X2>X3 holds true. The twist shrinkage is the ratio of the length reduction by twisting the strands. Specifically, the twist shrinkage is the ratio of the length L of the strand before twisting to the length L0 of the strand in the rope length direction after twisting, and is calculated according to X=(L-L0) / L. Therefore, the smaller the twist shrinkage, the smaller the reduction.

[0048] The diameters of all the inner strands 29 are the same. The diameters of all the outer strands 27 are the same. The diameters of all the sub-strands 30 are the same. When the diameter of each inner strand 29 is d1, the diameter of each outer strand 27 is d2, and the diameter of each sub-strand 30 is d3, d1≥d2>d3 holds. In addition, the diameter d1 is smaller than the diameter of each steel strand 22.

[0049] In such a main rope 6, when observing the cross section perpendicular to the length direction of the core wire 21, each outer layer strand 27 is arranged between adjacent inner layer strands 29 on the outer periphery of the inner layer 26. In addition, each sub-strand assembly 28 is arranged between adjacent outer layer strands 27. In addition, each sub-strand assembly 28 has a plurality of sub-strands 30 arranged along the same circumference centered on the center of the inner layer 26.

[0050] Therefore, the gap inside the core wire 21 and the gap between the outer periphery of the core wire 21 and the layer of the plurality of steel strands 22 can be reduced. As a result, the shape of the cross section perpendicular to the length direction of the core wire 21 can be made more stable, and the fatigue performance of the main rope 6 can be improved. In addition, the manufacturing stability of the main rope 6 can be improved.

[0051] In addition, the plurality of inner layer strands 29 are twisted and bundled together, so that the gap inside the inner layer 26 is reduced, and deformation of the inner layer 26 during long-term use can be suppressed.

[0052] In addition, the plurality of outer layer strands 27 and the plurality of sub-strand assemblies 28 are twisted around the outer periphery of the inner layer 26. Therefore, the gap inside the inner layer 26 is further reduced, and deformation of the inner layer 26 during long-term use can be suppressed.

[0053] In addition, the main rope 6 is bent every time it passes through the driving sheave 4. In response to this, the plurality of inner layer strands 29 are twisted together, and the plurality of outer layer strands 27 and the plurality of sub-strand assemblies 28 are twisted around the outer periphery of the inner layer 26. Therefore, the main rope 6 of the first embodiment is resistant to repeated bending and has high fatigue performance.

[0054] Furthermore, the twist rate X3 of each sub-strand 30 is smaller than the twist rate X2 of each outer layer strand 27, and the twist rate X2 of each outer layer strand 27 is smaller than the twist rate X1 of each inner layer strand 29. Therefore, when tension is applied to the main rope 6, the radial contraction of the outer periphery of the core wire 21 is suppressed from being greater than the radial contraction of the center of the core wire 21.

[0055] Thus, when tension is applied to the main rope 6, the loads of the inner strands 29, the outer strands 27, and the sub-strands 30 can be more evenly distributed. Therefore, the elongation of the main rope 6 can be suppressed and the breaking strength of the main rope 6 can be increased.

[0056] Furthermore, the diameter d3 of each sub-strand 30 is smaller than the diameter d2 of each outer layer strand 27, and the diameter d2 of each outer layer strand 27 is less than the diameter d1 of each inner layer strand 29. Therefore, it is possible to further reduce the gap in the core wire 21. In addition, it is possible to suppress the elongation of the main rope 6 when tension is applied to the main rope 6, and to improve the breaking strength of the main rope 6.

[0057] Here, the core wire of a general elevator rope is composed of three core wire strands. Therefore, a general core wire manufacturing device is configured to twist three core wire strands.

[0058] In contrast, in the core wire 21 of the first embodiment, the number of the plurality of inner layer strands 29 is three, and the number of the plurality of outer layer strands 27 is three. Therefore, the inner layer 26 can be easily manufactured using an existing manufacturing device, and the plurality of outer layer strands 27 can be easily arranged on the outer periphery of the inner layer 26. Thus, an increase in manufacturing cost can be suppressed.

[0059] Furthermore, the number of the plurality of sub-strand assemblies 28 is three. Therefore, the plurality of sub-strand assemblies 28 can be easily arranged on the outer periphery of the inner layer 26 using an existing manufacturing apparatus. Thus, an increase in manufacturing cost can be suppressed.

[0060] Furthermore, when the diameter d1 of each inner layer strand 29 is equal to the diameter d2 of each outer layer strand 27, a plurality of inner layer strands 29 and a plurality of outer layer strands 27 can be manufactured by the same manufacturing device and under the same manufacturing conditions. This can suppress an increase in manufacturing cost.

[0061] Each inner layer strand 29 and each outer layer strand 27 are required to contain rope oil, that is, rope grease, to withstand the load applied from the plurality of steel strands 22 when tension is applied to the main rope 6 , and to ensure the rigidity of the core wire 21 .

[0062] On the other hand, the main functions required of each strand 30 are to fill the gaps between the core wires 21 and to increase the fiber density in the core wires 21. Therefore, the degree of freedom in selecting the material of each strand 30 is higher than that of each inner layer strand 29 and each outer layer strand 27.

[0063] For example, by forming each of the strands 30 with a yarn cheaper than the yarn forming each of the inner layer strands 29 and each of the outer layer strands 27 , the cost of the main rope 6 can be reduced.

[0064] Implementation method 2.

[0065] Next, Figure 31 is a cross-sectional view of the main rope 6 of Embodiment 2, showing a cross section perpendicular to the longitudinal direction of the main rope 6. The main rope 6 of Embodiment 2 has a core wire coating 31 made of resin in addition to the core wire 21 and a plurality of steel strands 22. The core wire coating 31 covers the outer periphery of the core wire 21.

[0066] A plurality of steel strands 22 are twisted around the outer periphery of the core wire 21 via the core wire coating 31 .

[0067] The other structures of the second embodiment are the same as those of the first embodiment.

[0068] In such a main rope 6, since the outer periphery of the core wire 21 is covered with the core wire covering body 31, it is possible to suppress the change in the cross-sectional shape of the core wire 21, and the performance of the main rope 6 can be further stabilized.

[0069] Furthermore, since the core wire 21 does not come into direct contact with the plurality of steel strands 22 , wear and damage to the core wire 21 can be suppressed.

[0070] Implementation method 3.

[0071] Next, Figure 4 1 is a cross-sectional view of the main rope 6 of Embodiment 3, showing a cross section perpendicular to the length direction of the main rope 6. The main rope 6 of Embodiment 3 has, in addition to the core wire 21 and the plurality of steel strands 22, an inner layer coating 32 made of resin, a plurality of outer layer strand coatings 33 made of resin, and a plurality of sub-strand coatings 34 made of resin.

[0072] The inner layer 26 is covered with an inner layer covering body 32. Each outer layer strand 27 is covered with an outer layer strand covering body 33. Each sub-strand assembly 28 is covered with a sub-strand covering body 34.

[0073] The other structures of the third embodiment are the same as those of the first embodiment.

[0074] In such a main rope 6 , each outer layer strand 27 is covered with an outer layer strand covering body 33 , and each sub-strand assembly 28 is covered with a sub-strand covering body 34 .

[0075] Therefore, the adjacent inner layer strands 29 are suppressed from directly contacting the outer layer strands 27. Furthermore, the adjacent inner layer strands 29 are suppressed from directly contacting the sub-strands 30. Furthermore, the adjacent outer layer strands 27 are suppressed from directly contacting the sub-strands 30.

[0076] This can suppress the wear of each inner layer strand 29, each outer layer strand 27, and each sub-strand 30. In addition, the gap in the core wire 21 can be further reduced.

[0077] In addition, the inner layer 26 is covered with the inner layer covering body 32. Therefore, it is more reliably suppressed that the adjacent inner layer strands 29 and the outer layer strands 27 come into direct contact. In addition, it is more reliably suppressed that the adjacent inner layer strands 29 and the sub-strands 30 come into direct contact.

[0078] Implementation method 4.

[0079] Next, Figure 5 This is a cross-sectional view of the main rope 6 of Embodiment 4, showing a cross section perpendicular to the length direction of the main rope 6. In the main rope 6 of Embodiment 1, the impregnation resin 35 is impregnated into each inner layer strand 29, each outer layer strand 27, and each sub-strand 30 and cured.

[0080] The other structures of the fourth embodiment are the same as those of the first embodiment.

[0081] In such a main rope 6, the impregnation resin 35 is impregnated into each inner layer strand 29, each outer layer strand 27, and each sub-strand 30. Therefore, even when the main rope 6 is bent, the relative positions of the fibers can be fixed, and the inter-fiber space ratio can be maintained low.

[0082] In Embodiments 1 to 4, natural fibers or synthetic fibers commonly used can be used as fibers constituting the core wire 21, but fibers with higher strength can also be used to increase the breaking strength and mass specific strength of the main rope 6. This can further increase the load that the core wire 21 can withstand, and can increase the breaking strength of the main rope 6 as a whole.

[0083] Furthermore, when it is desired to improve the mass specific strength even if the breaking load is slightly reduced with the same diameter of the main rope 6, the cross-sectional area of ​​each steel strand 22 may be reduced while the cross-sectional area of ​​the core wire 21 may be increased.

[0084] The cross-sectional structure of the main rope 6 as a whole is not limited to the structure of Embodiments 1 to 4. For example, the number of steel strands 22, the cross-sectional structure, etc. may be changed. The number of inner strands 29, the number of outer strands 27, and the number of sub-strands 30 may also be changed.

[0085] Furthermore, the diameter d1 of each inner layer strand 29 may be equal to or larger than the diameter of each steel strand 22 .

[0086] Furthermore, one or more layers of steel strands may be added outside the layer of the steel strands 22 .

[0087] Furthermore, when manufacturing each steel strand 22, each steel strand 22 may be compressed from the radially outer side by a die, thereby deforming the cross-sectional shape of each steel strand 22. Thus, the cross-sectional shape of each steel strand 22 can be made circular, the contact surface pressure between the main rope 6 and the bottom surface of the sheave groove is reduced, and the fatigue performance of the main rope 6 is improved.

[0088] In Embodiments 1 to 4, the overall layout of the elevator device is not limited to Figure 1 For example, the roping method may also be a 1:1 roping method.

[0089] In addition, the elevator device may be an elevator device with a machine room, a double-deck elevator, a single-shaft multi-car type elevator device, etc. The single-shaft multi-car type is a type in which an upper car and a lower car arranged directly below the upper car are independently raised and lowered in a common shaft.

[0090] The elevator rope may be an elevator rope other than the main rope 6, such as a compensating rope or a speed-limiting rope. In addition, in an elevator belt having a plurality of ropes embedded in an outer layer resin, at least one rope may be the elevator rope of the present disclosure.

[0091] Description of symbols

[0092] 6: Main rope (elevator rope); 21: Core wire; 22: Steel strand; 26: Inner layer; 27: Outer strand; 28: Sub-strand assembly; 29: Inner strand; 30: Sub-strand; 31: Core wire sheath; 33: Outer strand sheath; 34: Sub-strand sheath; 35: Impregnated resin.

Claims

1. An elevator rope, wherein: The elevator rope comprises: Core wire; and A plurality of steel strands twisted around the outer periphery of the core wire, The core wire has: An inner layer, which is formed by bundling a plurality of inner layer strands made of fibers; a plurality of outer layer strands made of fiber, which are arranged on the outer periphery of the inner layer; and A plurality of sub-strand assemblies are arranged on the outer periphery of the inner layer, When observing the cross section of the core wire perpendicular to the length direction, Each of the outer layer strands is arranged between adjacent inner layer strands at the outer periphery of the inner layer, Each of the sub-strand assemblies has a plurality of fiber-made sub-strands, and the plurality of fiber-made sub-strands are arranged along the same circumference centered at the center of the inner layer. Each of the sub-strand assemblies is arranged between adjacent outer layer strands.

2. The elevator rope according to claim 1, wherein: The plurality of inner layer strands are twisted together and bundled.

3. The elevator rope according to claim 2, wherein: The plurality of outer layer strands and the plurality of sub-strand assemblies are twisted around the outer periphery of the inner layer, respectively.

4. The elevator rope according to any one of claims 1 to 3, wherein: Each of the inner layer strands, each of the outer layer strands, and each of the sub-strands is formed by twisting a plurality of yarns. When the twist shrinkage rate of each inner layer strand is X1, the twist shrinkage rate of each outer layer strand is X2, and the twist shrinkage rate of each sub-strand is X3, X1>X2>X3 holds.

5. The elevator rope according to any one of claims 1 to 4, wherein: The number of the plurality of inner layer strands is 3, The number of the plurality of outer layer rope strands is 3.

6. The elevator rope according to any one of claims 1 to 5, wherein: When the diameter of each inner layer rope strand is d1, the diameter of each outer layer rope strand is d2, and the diameter of each sub-rope strand is d3, d1≥d2>d3 holds.

7. The elevator rope according to any one of claims 1 to 6, wherein: The elevator rope further includes a core wire coating body made of resin, wherein the core wire coating body covers the outer circumference of the core wire. The plurality of steel strands are twisted around the outer periphery of the core wire via the core wire coating.

8. The elevator rope according to any one of claims 1 to 6, wherein: The elevator rope further comprises: A plurality of outer strand covering bodies made of resin; and A plurality of sub-strand covering bodies made of resin, Each of the outer layer strands is covered by the outer layer strand covering body, Each of the sub-strand assemblies is covered by the sub-strand covering body.

9. The elevator rope according to any one of claims 1 to 7, wherein: Each of the inner layer strands, each of the outer layer strands, and each of the sub-strands is impregnated with an impregnation resin.

10. An elevator device, wherein: The elevator device includes the elevator rope according to any one of claims 1 to 9.

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