Elevator ropes and elevator equipment

Abstract

Provided is a rope for an elevator, wherein a core rope has: an inner layer; a plurality of outer layer strands which are made of fibers and which are disposed on the outer periphery of the inner layer; and a plurality of substrand groups disposed at the circumference of the inner layer. The outer layer strands are each disposed between adjacent inner layer strands, on the outer periphery of the inner layer. The substrand groups each have a plurality of substrands made of fibers, which are arranged along the circumference of the same circle the center of which is the center of the inner layer. The substrand groups are each disposed between adjacent outer layer strands.

Description

[Technical field]

[0001] The present disclosure relates to elevator ropes and elevator devices. [Background technology]

[0002] In conventional wire ropes, multiple steel strands are twisted around a core rope. The core rope has three core rope strands and three sub-strands. Each core rope strand is made of a number of bundled synthetic fibers (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-170323 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional wire ropes described above, there are many gaps between the outer periphery of the core rope and the layers of the multiple steel strands, which makes the cross-sectional shape perpendicular to the longitudinal direction of the wire rope easily deformed.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide an elevator rope and an elevator apparatus that can more stabilize the cross-sectional shape perpendicular to the longitudinal direction of the core rope. [Means for solving the problem]

[0006] The elevator rope according to the present disclosure comprises a core rope and a plurality of steel strands twisted around the outer periphery of the core rope, the core rope having an inner layer constituted by bundling a plurality of inner layer fiber strands, a plurality of outer layer fiber strands arranged on the outer periphery of the inner layer, and a plurality of substrand assemblies arranged on the outer periphery of the inner layer, and when viewed in a cross section perpendicular to the longitudinal direction of the core rope, each outer layer strand is arranged between adjacent inner layer strands on the outer periphery of the inner layer, each substrand assembly has a plurality of fiber substrands arranged along the same circumference centered on the center of the inner layer, and each substrand assembly is arranged between adjacent outer layer strands. Effect of the Invention

[0007] According to the present disclosure, the cross-sectional shape perpendicular to the longitudinal direction of the core rope can be made more stable. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing an elevator device according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the main rope taken along line II-II in FIG. [Diagram 3] FIG. 11 is a cross-sectional view of a main rope according to a second embodiment. [Figure 4] FIG. 11 is a cross-sectional view of a main rope according to embodiment 3. [Diagram 5] FIG. 11 is a cross-sectional view of a main rope according to embodiment 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1 Fig. 1 is a schematic configuration diagram showing an elevator device according to embodiment 1. In the figure, a machine base 2 is fixed to the top of a hoistway 1. A hoisting machine 3 is installed on the machine base 2.

[0010] The hoist 3 has a drive sheave 4, a hoist motor 5, and a hoist brake (not shown). The hoist motor 5 rotates the drive sheave 4. The hoist brake keeps the drive sheave 4 stationary. The hoist brake also brakes the rotation of the drive sheave 4.

[0011] A plurality of main ropes 6, which are elevator ropes, are wound around the drive sheave 4. Only one main rope 6 is shown in FIG. 1. A plurality of sheave grooves (not shown) are provided on the outer periphery of the drive sheave 4. Each main rope 6 is inserted into a corresponding sheave groove.

[0012] At the top of the hoistway 1, a first cleat 7 and a second cleat 8 are provided. Each main rope 6 has a first end 6a and a second end 6b. Each first end 6a is connected to the first cleat 7. Each second end 6b is connected to the second cleat 8.

[0013] The car 9 and the counterweight 10 are suspended in the hoistway 1 by a plurality of main ropes 6. The car 9 and the counterweight 10 move up and down in the hoistway 1 by rotating the drive sheave 4.

[0014] A pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown) are installed in the hoistway 1. The pair of car guide rails guide the ascent and descent of the car 9. The pair of counterweight guide rails guide the ascent and descent of the counterweight 10.

[0015] A first car sheave 11a and a second car sheave 11b are provided below the car 9. A counterweight sheave 12 is provided above the counterweight 10.

[0016] The multiple main ropes 6 are wound around, in order from the first cleat 7 side, the first car sheave 11a, the second car sheave 11b, the drive sheave 4, and the counterweight sheave 12. That is, the roping system of the elevator apparatus in the first embodiment is a 2:1 roping system.

[0017] FIG. 2 is a cross-sectional view of the main rope 6 taken along line II-II in FIG.

[0018] The main rope 6 has a core rope 21 and a plurality of steel strands 22. The plurality of steel strands 22 are twisted around the outer periphery of the core rope 21. In this example, twelve steel strands 22 are used. The diameter of each steel strand 22 is smaller than the diameter of the core rope 21.

[0019] Each steel strand 22 has a plurality of steel wires. The plurality of steel wires includes a central wire 23, a plurality of intermediate wires 24, and a plurality of outer layer wires 25.

[0020] The central wire 23 is disposed at the center of a 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 central wire 23. In this example, nine intermediate wires 24 are used.

[0021] The multiple outer layer wires 25 are twisted around the outer periphery of an intermediate layer consisting of multiple 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.

[0022] The diameter of each intermediate strand 24 is smaller than the diameter of the central strand 23. The diameter of each intermediate strand 24 is also smaller than the diameter of each outer layer strand 25. The diameter of each outer layer strand 25 is the same as the diameter of the central strand 23.

[0023] When the load of the car 9 and the counterweight 10 actually acts on the main ropes 6 , each steel strand 22 is pressed against the outer periphery of the core rope 21 .

[0024] The core rope 21 has an inner layer 26, a plurality of outer layer strands 27 made of fiber, and a plurality of sub-strand assemblies 28.

[0025] The inner layer 26 is disposed at the center of the core rope 21 in a cross section perpendicular to the longitudinal direction of the core rope 21. The inner layer 26 is formed by bundling a plurality of inner layer strands 29 made of fibers. The inner layer strands 29 are twisted together and bundled. In this example, the number of the inner layer strands 29 is three.

[0026] When no load is applied to the main rope 6, the cross-sectional shape of each inner layer strand 29 is circular.

[0027] The multiple outer layer strands 27 are disposed on the outer periphery of the inner layer 26. In addition, the multiple outer layer strands 27 are twisted around the outer periphery of the inner layer 26. In this example, the number of the multiple outer layer strands 27 is the same as the number of the multiple inner layer strands 29, i.e., three.

[0028] When no load is applied to the main rope 6, the cross-sectional shape of each outer layer strand 27 is circular.

[0029] When viewed in a cross section perpendicular to the longitudinal direction of the core rope 21, each outer layer strand 27 is disposed between adjacent inner layer strands 29 on the outer periphery of the inner layer 26. In other words, each outer layer strand 27 partially enters a recess 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.

[0030] The plurality of substrand assemblies 28 are disposed on the outer periphery of the inner layer 26. The plurality of substrand assemblies 28 are also twisted together on the outer periphery of the inner layer 26. In this example, the number of the plurality of substrand assemblies 28 is the same as the number of the plurality of inner layer strands 29, i.e., three. The plurality of outer layer strands 27 and the plurality of substrand assemblies 28 are disposed alternately on the outer periphery of the inner layer 26.

[0031] Each substrand assembly 28 has a plurality of fibrous substrands 30. In this example, the number of the plurality of substrands 30 in each substrand assembly 28 is three.

[0032] When no load is applied to the main rope 6, the cross-sectional shape of each sub-strand 30 is circular.

[0033] When viewed in a cross section perpendicular to the longitudinal direction of the core rope 21 , the multiple substrands 30 in each substrand assembly 28 are arranged along the same circumference centered on the center of the inner layer 26 .

[0034] When looking at a cross section perpendicular to the longitudinal direction of the core rope 21, each substrand assembly 28 is disposed between adjacent outer layer strands 27. In other words, each substrand assembly 28 is filled between adjacent outer layer strands 27.

[0035] Each of the inner layer strands 29, each of the outer layer strands 27, and each of the sub-strands 30 is formed by twisting together a plurality of yarns.

[0036] If 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, then X1>X2>X3 holds. The twist shrinkage is the rate at which the length is reduced by twisting a strand. Specifically, the twist shrinkage is the ratio between the length L of the strand before twisting and the length L0 of the strand in the longitudinal direction of the rope after twisting, and is calculated as X=(L-L0) / L. For this reason, the smaller the twist shrinkage, the smaller the amount of reduction.

[0037] All of the inner layer strands 29 have the same diameter. All of the outer layer strands 27 have the same diameter. All of the sub-strands 30 have the same diameter. If the diameter of each inner layer strand 29 is d1, the diameter of each outer layer strand 27 is d2, and the diameter of each sub-strand 30 is d3, then d1 ≧ d2 > d3 holds. Furthermore, the diameter d1 is smaller than the diameter of each steel strand 22.

[0038] In such a main rope 6, when viewed in a cross section perpendicular to the longitudinal direction of the core rope 21, each outer layer strand 27 is disposed between adjacent inner layer strands 29 on the outer periphery of the inner layer 26. Also, each substrand assembly 28 is disposed between adjacent outer layer strands 27. Also, each substrand assembly 28 has a plurality of substrands 30 arranged along the same circumference centered on the center of the inner layer 26.

[0039] This makes it possible to reduce the gaps within the core rope 21 and the gaps between the outer periphery of the core rope 21 and the layers of the multiple steel strands 22. This makes it possible to further stabilize the cross-sectional shape perpendicular to the longitudinal direction of the core rope 21, thereby improving the fatigue performance of the main ropes 6. In addition, the manufacturing stability of the main ropes 6 can be improved.

[0040] Furthermore, the inner layer strands 29 are twisted together and bound together, which reduces gaps inside the inner layer 26 and suppresses deformation of the inner layer 26 over time.

[0041] Additionally, the multiple outer layer strands 27 and the multiple sub-strand assemblies 28 are each twisted around the outer periphery of the inner layer 26. This further reduces gaps inside the inner layer 26, making it possible to suppress deformation of the inner layer 26 over time.

[0042] Furthermore, the main rope 6 is bent each time it passes through the drive sheave 4. In contrast, the multiple inner layer strands 29 are twisted together, and the multiple outer layer strands 27 and the multiple sub-strand assemblies 28 are twisted around the outer periphery of the inner layer 26. For this reason, the main rope 6 of the first embodiment is resistant to repeated bending and has high fatigue performance.

[0043] Furthermore, the twist shrinkage rate X3 of each sub-strand 30 is smaller than the twist shrinkage rate X2 of each outer layer strand 27, which in turn is smaller than the twist shrinkage rate X1 of each inner layer strand 29. For this reason, when tension is applied to the main rope 6, the radial shrinkage is prevented from becoming greater on the outer periphery than at the center of the core rope 21.

[0044] This makes it possible to more uniformly distribute the load among the multiple inner layer strands 29, the multiple outer layer strands 27, and the multiple sub-strands 30 when tension is applied to the main rope 6. This makes it possible to suppress the elongation of the main rope 6 and to increase the breaking strength of the main rope 6.

[0045] 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 equal to or smaller than the diameter d1 of each inner layer strand 29. This makes it possible to further reduce the gaps in the core rope 21. Furthermore, the elongation of the main rope 6 when tension is applied to the main rope 6 can be suppressed, and the breaking strength of the main rope 6 can be increased.

[0046] Here, the core rope of a typical elevator rope is composed of three core rope strands, and therefore a typical core rope manufacturing device is configured to twist the three core rope strands together.

[0047] In contrast, in the core rope 21 of the first embodiment, the number of the multiple inner layer strands 29 is three, and the number of the multiple outer layer strands 27 is three. Therefore, the inner layer 26 can be easily manufactured using existing manufacturing equipment, and the multiple outer layer strands 27 can be easily arranged on the outer periphery of the inner layer 26. This makes it possible to suppress an increase in manufacturing costs.

[0048] Furthermore, the number of the sub-strand assemblies 28 is three. Therefore, the sub-strand assemblies 28 can be easily disposed on the outer periphery of the inner layer 26 using existing manufacturing equipment. This makes it possible to suppress an increase in manufacturing costs.

[0049] Furthermore, when the diameter d1 of each inner layer strand 29 and the diameter d2 of each outer layer strand 27 are made the same, the inner layer strands 29 and the outer layer strands 27 can be manufactured using the same manufacturing equipment and under the same manufacturing conditions, thereby preventing an increase in manufacturing costs.

[0050] Each inner layer strand 29 and each outer layer strand 27 is required to have the following functions: contain rope oil, i.e., rope grease; withstand the load received from the multiple steel strands 22 when tension is applied to the main rope 6; and maintain the rigidity of the core rope 21.

[0051] On the other hand, the main functions required for each sub-strand 30 are to fill the gaps in the core rope 21 and to improve the fiber density within the core rope 21. For this reason, the degree of freedom in selecting materials for each sub-strand 30 is greater than the degree of freedom in selecting materials for each inner layer strand 29 and each outer layer strand 27.

[0052] For example, by forming each sub-strand 30 from a yarn that is less expensive than the yarn that forms each inner layer strand 29 and each outer layer strand 27, the cost of the main rope 6 can be reduced.

[0053] Embodiment 2 3 is a cross-sectional view of a main rope 6 according to a second embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 6. The main rope 6 of the second embodiment has a resin core rope covering body 31 in addition to a core rope 21 and a plurality of steel strands 22. The core rope covering body 31 covers the outer periphery of the core rope 21.

[0054] A plurality of steel strands 22 are twisted around the outer periphery of the core rope 21 via a core rope covering body 31 .

[0055] Other configurations in the second embodiment are similar to those in the first embodiment.

[0056] In such a main rope 6, the outer periphery of the core rope 21 is covered by the core rope covering body 31, so that changes in the cross-sectional shape of the core rope 21 can be suppressed, and the performance of the main rope 6 can be made more stable.

[0057] In addition, since the core rope 21 does not come into direct contact with the multiple steel strands 22, wear and damage to the core rope 21 can be suppressed.

[0058] Embodiment 3 Next, Fig. 4 is a cross-sectional view of a main rope 6 according to a third embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 6. The main rope 6 of the third embodiment has, in addition to a core rope 21 and a plurality of steel strands 22, a resin inner layer covering body 32, a plurality of resin outer layer strand covering bodies 33, and a plurality of resin sub-strand covering bodies 34.

[0059] The inner layer 26 is covered by an inner layer covering 32. Each outer layer strand 27 is covered by an outer layer strand covering 33. Each sub-strand assembly 28 is covered by a sub-strand covering 34.

[0060] Other configurations in the third embodiment are similar to those in the first embodiment.

[0061] In such a main rope 6 , each outer layer strand 27 is covered by an outer layer strand covering 33 , and each sub-strand assembly 28 is covered by a sub-strand covering 34 .

[0062] This prevents adjacent inner layer strands 29 and outer layer strands 27 from coming into direct contact with each other. In addition, this prevents adjacent inner layer strands 29 and sub-strands 30 from coming into direct contact with each other. In addition, this prevents adjacent outer layer strands 27 and sub-strands 30 from coming into direct contact with each other.

[0063] This makes it possible to suppress wear of the inner layer strands 29, the outer layer strands 27, and the sub-strands 30. In addition, the gaps within the core wire 21 can be further reduced.

[0064] Moreover, the inner layer 26 is covered with the inner layer covering body 32. This more reliably prevents adjacent inner layer strands 29 and outer layer strands 27 from coming into direct contact with each other. Furthermore, it more reliably prevents adjacent inner layer strands 29 and sub-strands 30 from coming into direct contact with each other.

[0065] Embodiment 4 Next, Fig. 5 is a cross-sectional view of the main rope 6 according to the fourth embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 6. In the main rope 6 of the first embodiment, each of the inner layer strands 29, each of the outer layer strands 27, and each of the sub-strands 30 is impregnated with an impregnating resin 35 and cured.

[0066] Other configurations in the fourth embodiment are similar to those in the first embodiment.

[0067] In such a main rope 6, each of the inner layer strands 29, each of the outer layer strands 27, and each of the sub-strands 30 are impregnated with an impregnating resin 35. Therefore, even when the main rope 6 is bent, the relative positions of the fibers can be fixed, and a low inter-fiber space ratio can be maintained.

[0068] In the first to fourth embodiments, commonly used natural or synthetic fibers may be used as the fibers constituting the core rope 21, but higher strength fibers may be used to increase the breaking strength and strength to mass ratio of the main ropes 6. This allows the load that the core rope 21 can bear to be increased, and the breaking strength of the main ropes 6 as a whole to be increased.

[0069] Furthermore, if it is desired to increase the strength to mass ratio even at the expense of a slight reduction in the breaking load for 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 rope 21 is increased.

[0070] Furthermore, the cross-sectional configuration of the entire main rope 6 is not limited to that of the first to fourth embodiments. For example, the number and cross-sectional configuration of the steel strands 22 may be changed. Furthermore, the number of inner layer strands 29, the number of outer layer strands 27, and the number of sub-strands 30 may be changed.

[0071] Furthermore, the diameter d 1 of each inner layer strand 29 may be equal to or greater than the diameter of each steel strand 22 .

[0072] Additionally, one or more layers of steel strands may be added outside the layer of steel strands 22 .

[0073] Furthermore, when manufacturing each steel strand 22, the cross-sectional shape of each steel strand 22 may be deformed by compressing each steel strand 22 from the radially outer side using a die. This makes it possible to make the cross-sectional shape of each steel strand 22 circular, reduce the contact surface pressure between the main rope 6 and the bottom surface of the sheave groove, and improve the fatigue performance of the main rope 6.

[0074] Furthermore, in the first to fourth embodiments, the layout of the entire elevator apparatus is not limited to the layout in Fig. 1. For example, the roping system may be a 1:1 roping system.

[0075] The elevator system may be an elevator system having a machine room, a double-deck elevator, a one-shaft multi-car system elevator system, etc. The one-shaft multi-car system is a system in which an upper car and a lower car arranged directly below the upper car independently ascend and descend in a common elevator shaft.

[0076] The elevator rope may also be an elevator rope other than the main rope 6, for example, a compensating rope or a governor rope. In an elevator belt in which multiple ropes are embedded in the outer layer resin, at least one rope may be the elevator rope of the present disclosure. [Explanation of symbols]

[0077] 6 Main rope (elevator rope), 21 Core rope, 22 Steel strand, 26 Inner layer, 27 Outer layer strand, 28 Sub-strand assembly, 29 Inner layer strand, 30 Sub-strand, 31 Core rope coating, 33 Outer layer strand coating, 34 Sub-strand coating, 35 Impregnating resin.

Claims

1. Core rope, and A plurality of steel strands twisted together around the outer periphery of the core rope Equipped with The core rope is an inner layer formed by bundling a plurality of inner layer strands made of fibers; a plurality of fibrous outer layer strands disposed around the outer periphery of the inner layer; a plurality of sub-strand assemblies disposed on an outer periphery of the inner layer; It has When viewed in a cross section perpendicular to the longitudinal direction of the core rope, Each of the outer layer strands is disposed between adjacent inner layer strands on an outer periphery of the inner layer, Each of the sub-strand assemblies includes a plurality of fibrous sub-strands arranged along the same circumference about a center of the inner layer; Each of the sub-strand assemblies is disposed between adjacent outer layer strands.

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

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

4. 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 together, 4. The elevator rope according to claim 1, wherein the relationship X1 > X2 > X3 holds true, where X1 is a twist shrinkage rate of each of the inner layer strands, X2 is a twist shrinkage rate of each of the outer layer strands, and X3 is a twist shrinkage rate of each of the sub-strands.

5. The number of the inner layer strands is three, 4. The elevator rope according to claim 1, wherein the number of the outer layer strands is three.

6. 4. The elevator rope according to claim 1, wherein d1 ≧ d2 > d3 is satisfied, where d1 is a diameter of each of the inner layer strands, d2 is a diameter of each of the outer layer strands, and d3 is a diameter of each of the sub-strands.

7. A resin core wire covering body that covers the outer periphery of the core wire Further equipped with 4. The elevator rope according to claim 1, wherein the plurality of steel strands are twisted around the outer periphery of the core rope via the core rope covering.

8. A plurality of resin outer strand coverings; and Multiple resin substrand sheath Further equipped with Each of the outer layer strands is covered by the outer layer strand covering, 4. The elevator rope according to claim 1, wherein each of the sub-strand assemblies is covered by the sub-strand covering.

9. 4. The elevator rope according to claim 1, 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 apparatus comprising the elevator rope according to any one of claims 1 to 3.

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