Elevator wire rope and elevator device

Abstract

In the elevator wire rope, each outer strand has a central wire and at least one wire layer arranged around the central wire. The at least one wire layer includes an outer layer that contacts the outer periphery of the rope core. The outer layer has a plurality of outer layer wires. When viewed in a cross section perpendicular to the longitudinal direction of each outer strand, the wire filling rate, which is the ratio of the total cross-sectional area of ​​all wires included in each outer strand to the area of ​​the circumscribed circle of each outer strand, is 85% or more.

Description

[Technical Field]

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

[0002] In conventional elevator wire ropes, multiple steel side strands are arranged around the outer periphery of the rope core, and multiple steel auxiliary strands are arranged around the outer periphery of the layer made up of multiple side strands (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-237908 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional elevator wire ropes described above, multiple auxiliary strands are added to extend the service life. Furthermore, each of the outer layer wires in each auxiliary strand is deformed. This results in a complicated structure and a complicated manufacturing process.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an elevator wire rope that has a simple configuration and can achieve a long life, and an elevator device using the same. [Means for solving the problem]

[0006] The elevator wire rope according to the present disclosure comprises a rope core and a plurality of steel outer strands arranged on the outer periphery of the rope core, each outer strand having a central wire and at least one wire layer arranged on the outer periphery of the central wire, the at least one wire layer including an outer layer in contact with the outer periphery of the rope core, the outer layer having a plurality of outer layer wires, and when viewed in a cross section perpendicular to the longitudinal direction of each outer strand, the wire filling rate, which is the ratio of the total cross-sectional area of ​​all wires included in each outer strand to the area of ​​the circumscribed circle of each outer strand, is 85% or more. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to extend the life of an elevator wire rope with a simple configuration. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing an elevator apparatus according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the main rope of FIG. 1. [Figure 3] 10 is a graph showing the results of an experiment in which the bending fatigue life of each of a plurality of main ropes with different wire filling rates in the outer circumferential strands was investigated. [Figure 4] FIG. 10 is a cross-sectional view of a main rope according to a second embodiment. [Figure 5] FIG. 5 is an enlarged cross-sectional view of the outer peripheral strand of FIG. 4. [Figure 6] FIG. 10 is a cross-sectional view of a main rope according to a third embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a main rope according to a fourth embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a main rope according to a fifth embodiment. [Figure 9] FIG. 20 is a cross-sectional view of a main rope according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1 1 is a schematic configuration diagram showing an elevator apparatus according to embodiment 1. The elevator apparatus of embodiment 1 is a machine room-less elevator of a 2:1 roping system.

[0010] In the drawing, a support beam 12 is provided at the top of a hoistway 11. A hoisting machine 13 is supported on the support beam 12. The hoisting machine 13 has a drive sheave 14, a hoisting machine motor (not shown), and a hoisting machine brake (not shown).

[0011] The hoist motor rotates the drive sheave 14. The hoist brake holds the drive sheave 14 stationary. The hoist brake also brakes the rotation of the drive sheave 14.

[0012] A plurality of main ropes 15 are wound around the drive sheave 14. Only one of the plurality of main ropes 15 is shown in FIG. 1. Each main rope 15 is the elevator wire rope in the first embodiment.

[0013] The car 16 and the counterweight 17 are suspended within the hoistway 11 by a plurality of main ropes 15. The car 16 and the counterweight 17 move up and down within the hoistway 11 by rotating the drive sheave 14.

[0014] A pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown) are installed in the hoistway 11. The pair of car guide rails guide the rising and falling of the car 16. The pair of counterweight guide rails guide the rising and falling of the counterweight 17.

[0015] FIG. 2 is a cross-sectional view of the main rope 15 of FIG. 1, showing a cross section perpendicular to the longitudinal direction of the main rope 15.

[0016] The cross section shown in Fig. 2 is a design cross section of the main rope 15. That is, the cross section shown in Fig. 2 is a cross section of the main rope 15 in an unused state before it is actually used in an elevator apparatus. The cross sections shown in Fig. 4 and Figs. 6 to 9 relating to the following embodiments 2 to 6 are also design cross sections of the main rope 15.

[0017] The main rope 15 has a rope core 21 and a plurality of steel outer strands 22. Fiber is used as the material of the rope core 21. That is, the rope core 21 of the first embodiment is a fiber core (FC). Although natural fibers may be used as the fiber, it is preferable to use long synthetic fibers. As the synthetic fiber, polyester multifilament is particularly preferable in terms of mechanical properties and manufacturing costs.

[0018] The plurality of outer circumferential strands 22 are arranged on the outer periphery of the rope core 21. The plurality of outer circumferential strands 22 are also directly twisted around the outer periphery of the rope core 21. The number of outer circumferential strands 22 is eight.

[0019] Each of the outer circumferential strands 22 has a central wire 23 and at least one wire layer. Each of the outer circumferential strands 22 in the first embodiment has at least one wire layer, which is an outer layer 24 and an inner layer 25. That is, each of the outer circumferential strands 22 in the first embodiment has two wire layers.

[0020] The central wire 23 is disposed at the center of the outer strand 22. The outer layer 24 is disposed on the outer periphery of the central wire 23. The outer layer 24 is in contact with the outer periphery of the rope core 21. The inner layer 25 is disposed between the central wire 23 and the outer layer 24.

[0021] The outer layer 24 has a plurality of outer layer wires 26. The plurality of outer layer wires 26 are twisted together on the outer periphery of the inner layer 25. In this example, the number of outer layer wires 26 is 13.

[0022] The inner layer 25 has a plurality of inner layer wires 27. The plurality of inner layer wires 27 are twisted around the outer periphery of the central wire 23. In this example, the number of inner layer wires 27 is 13, the same as the number of outer layer wires 26.

[0023] The diameter of the central wire 23 is larger than that of each of the outer layer wires 26. The diameter of each of the inner layer wires 27 is smaller than that of each of the outer layer wires 26. The cross-sectional configuration of each outer strand 22 is an 8×S(27) sealed type (EUROPIAN STANDARD notation: 8×27S S: Seale Construction).

[0024] The tensile strength of each outer layer wire 26 is 1770 N / mm 2 For example, 1620N / mm 2 Grade or 1770N / mm 2 It is a grade.

[0025] The tensile strength of the central wire 23 and the tensile strength of each inner layer wire 27 are 2000 N / mm 2 For example, 2160N / mm 2 Grade or 2360N / mm 2 That is, the tensile strength of the central wire 23 and the tensile strength of each of the inner layer wires 27 are each about 1.2 times the tensile strength of each of the outer layer wires 26.

[0026] When viewed in a cross section perpendicular to the longitudinal direction of each peripheral strand 22, the wire filling rate of each peripheral strand 22 is 85% or more. The wire filling rate is the ratio of the total cross-sectional area of ​​all the wires included in each peripheral strand 22 to the area of ​​the circumscribing circle of each peripheral strand 22 in a cross section perpendicular to the longitudinal direction of each peripheral strand 22. Hereinafter, the circumscribing circle of each peripheral strand 22 will also be referred to as the virtual outer diameter circle.

[0027] More specifically, the wire filling rate ρs in each outer strand 22 in the first embodiment is calculated by the following formula.

[0028] ρs=Aw / As×100

[0029] Aw=[1×d1 2 +N2×d2 2 / sinθ2+N3×d3 2 / sinθ3]×π / 4

[0030] As=d s 2 ×π / 4

[0031] Aw: total cross-sectional area of ​​wires in the outer strand 22 As: Area of ​​the outer diameter imaginary circle of the outer strand 22 d s : Diameter of the outer diameter imaginary circle of the outer strand 22 d1: diameter of central wire 23 d2: diameter of inner layer wire 27 d3: diameter of outer layer wire 26 N2: Number of inner layer wires 27 N3: Number of outer layer wires 26 θ2: twist angle of inner layer wire 27 θ3: twist angle of outer layer wires 26

[0032] In each main rope 15 in such an elevator system, a plurality of steel outer strands 22 are arranged on the outer periphery of a rope core 21. Each outer strand 22 has a center wire 23, an outer layer 24 in contact with the outer periphery of the rope core 21, and an inner layer 25. The outer layer 24 has a plurality of outer layer wires 26. The inner layer 25 has a plurality of inner layer wires 27.

[0033] Therefore, the configuration of each outer circumferential strand 22 is simple, and no special manufacturing process is required, so that the main rope 15 can be easily manufactured using existing manufacturing equipment.

[0034] When viewed in a cross section perpendicular to the longitudinal direction of each outer circumferential strand 22, the wire filling rate of each outer circumferential strand 22 is 85% or more.

[0035] Figure 3 is a graph showing the results of an experiment to examine the bending fatigue life of several main ropes with different wire filling rates in the outer strands. The bending fatigue life is the number of times the main rope is repeatedly bent and straightened before it needs to be replaced.

[0036] From the results of our own experiments shown in Figure 3, it was discovered that the bending fatigue life increases dramatically when the wire filling rate is set to 85% or more.

[0037] Therefore, according to the first embodiment, a simple configuration can be used to extend the life of each main rope 15. This allows the replacement cycle of the main ropes 15 to be extended, reducing the effort required for maintenance work and reducing life cycle costs.

[0038] Furthermore, ten or more outer layer wires 26 are used in each outer strand 22 of the main rope 15 in the first embodiment. This makes it possible to more reliably increase the wire filling rate of each outer strand 22, easily extending the life of each main rope 15. Furthermore, the contact surface pressure between the main rope 15 and the drive sheave 14 can be reduced.

[0039] In addition, in each outer strand 22, an inner layer 25 is disposed between the central wire 23 and the outer layer 24. This allows the strength of each outer strand 22 to be increased while keeping the diameter of the central wire 23 small.

[0040] In addition, the cross-sectional configuration of each outer strand 22 is a sealed type, which allows the main rope 15 to be easily manufactured using existing manufacturing equipment.

[0041] Furthermore, by making the number of outer peripheral strands 22 six or more, the cross-sectional shape of the main rope 15 can be stabilized.

[0042] Furthermore, the outer circumferential strands 22 are not subjected to a deforming process that compresses the outer circumferential strands 22 from the outside in the radial direction, which makes the outer circumferential strands 22 easy to manufacture.

[0043] The tensile strength of each outer layer wire 26 is 1770 N / mm 2 The tensile strength of the central wire 23 and the tensile strength of each inner layer wire 27 are 2000 N / mm or less. 2 As a result, the breaking load of the main rope 15 can be increased more reliably while suppressing wear on the main rope 15 and the drive sheave 14.

[0044] Furthermore, the strength of each main rope 15 can be increased, and even with the same safety factor as before, it can support a high tensile load, and the cost of equipment can be reduced by reducing the number of main ropes 15. Furthermore, the diameter of the drive sheave 14 and other pulleys can be reduced.

[0045] Embodiment 2 Next, Fig. 4 is a cross-sectional view of the main rope 15 according to the second embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 15. Fig. 5 is a cross-sectional view showing an enlarged view of the outer peripheral strand 22 of Fig. 4.

[0046] In the second embodiment, the number of outer layer wires 26 in each outer strand 22 is 15. The number of inner layer wires 27 in each outer strand 22 is the same as the number of outer layer wires 26, that is, 15. The cross-sectional configuration of each outer strand 22 is a sealed shape of 8×S(31).

[0047] Other configurations in the second embodiment are the same as those in the first embodiment.

[0048] With this configuration, the same effects as those of the first embodiment can be obtained.

[0049] Embodiment 3 Next, FIG. 6 is a cross-sectional view of the main rope 15 according to the third embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 15. As shown in FIG.

[0050] Each outer strand 22 in the third embodiment is provided with only an outer layer 24 as at least one wire layer, and does not have an inner layer 25. That is, the cross-sectional configuration of each outer strand 22 in the third embodiment is a single lay type.

[0051] Each outer layer wire 26 is directly twisted around the outer periphery of the central wire 23. The number of outer layer wires 26 in each outer strand 22 is ten.

[0052] Other configurations in the third embodiment are the same as those in the first embodiment.

[0053] Even with this configuration, it is possible to obtain the same effects as in embodiment 1. Furthermore, since the configuration of each outer circumferential strand 22 is simplified, the outer circumferential strand 22 can be easily manufactured.

[0054] In each outer strand 22 of the main rope 15 of the third embodiment, the diameter of the central wire 23 is large, but if the diameter of the main rope 15 is small, the cross-sectional configuration of the third embodiment is applicable.

[0055] Embodiment 4 Next, FIG. 7 is a cross-sectional view of the main rope 15 according to the fourth embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 15. As shown in FIG.

[0056] The main rope 15 of the fourth embodiment has a rope core 31 and a plurality of outer strands 22. The rope core 31 of the fourth embodiment is formed by twisting together a plurality of steel strands. That is, the rope core 31 of the fourth embodiment is a steel rope core (IWRC: Independent Wire Rope Core).

[0057] The number of outer layer wires 26 in each outer strand 22 is 11. The number of inner layer wires 27 in each outer strand 22 is the same as the number of outer layer wires 26, 11.

[0058] Other configurations in the fourth embodiment are the same as those in the first embodiment.

[0059] With this configuration, the same effects as those of the first embodiment can be obtained.

[0060] Embodiment 5. Next, FIG. 8 is a cross-sectional view of the main rope 15 according to the fifth embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 15. As shown in FIG.

[0061] The main rope 15 of the fifth embodiment has a rope core 41 and a plurality of outer strands 22. The rope core 41 of the fifth embodiment has a steel core strand 42 and a synthetic fiber covering body 43. The core strand 42 is disposed at the center of the rope core 41. The covering body 43 covers the outer periphery of the core strand 42. In other words, the rope core 41 of the fifth embodiment is a composite core.

[0062] The number of outer layer wires 26 in each outer strand 22 is 12. The number of inner layer wires 27 in each outer strand 22 is the same as the number of outer layer wires 26, that is, 12.

[0063] Other configurations in the fifth embodiment are the same as those in the first embodiment.

[0064] With this configuration, the same effects as those of the first embodiment can be obtained.

[0065] Embodiment 6 Next, FIG. 9 is a cross-sectional view of the main rope 15 according to the sixth embodiment, showing a cross section perpendicular to the longitudinal direction of the main rope 15. As shown in FIG.

[0066] The rope core 41 of the sixth embodiment has a steel core strand 42 and a resin covering 44. The covering 44 is provided on the outer periphery of the core strand 42 by, for example, extrusion molding.

[0067] The number of outer layer wires 26 in each outer strand 22 is 14. The number of inner layer wires 27 in each outer strand 22 is the same as the number of outer layer wires 26, that is, 14.

[0068] Other configurations in the sixth embodiment are the same as those in the fifth embodiment.

[0069] With this configuration, the same effects as those of the first embodiment can be obtained.

[0070] In the first to sixth embodiments, the number of outer layer wires 26 in each outer strand 22 is not limited to the above example, but the number of outer layer wires 26 in each outer strand 22 is preferably 10 or more.

[0071] Furthermore, in the first to sixth embodiments, the number of the peripheral strands 22 is not limited to eight. However, the number of the peripheral strands 22 is preferably six or more.

[0072] Furthermore, the main ropes 15 of the first to sixth embodiments may be used in a newly installed elevator system, but may also be used in place of the main ropes of an existing elevator system.

[0073] Furthermore, the layout of the entire elevator apparatus is not limited to the layout shown in Fig. 1. For example, the roping system may be a 1:1 roping system.

[0074] The elevator system may also be a machine room-less elevator, a double-deck elevator, a one-shaft multi-car elevator system, etc. The one-shaft multi-car system is a system in which an upper car and a lower car located directly below the upper car independently ascend and descend in a common elevator shaft.

[0075] The elevator wire rope may also be an elevator wire rope other than the main rope 15, such as a compensating rope or a governor rope. [Explanation of symbols]

[0076] 15 Main rope (elevator wire rope), 16 Cage, 21, 31, 41 Rope core, 22 Outer strand, 23 Center wire, 24 Outer layer (wire layer), 25 Inner layer (wire layer), 26 Outer layer wire, 27 Inner layer wire.

Claims

1. Rope heart, and a plurality of steel outer strands disposed around the outer periphery of the rope core; Equipped with Each of the peripheral strands is a central wire; at least one strand layer disposed on the outer periphery of the central strand; It has the at least one wire layer includes an outer layer in contact with an outer periphery of the rope core, and an inner layer disposed between the central wire and the outer layer, The outer layer has a plurality of outer layer wires, The inner layer has a plurality of inner layer wires, Each of the outer circumferential strands has a sealed cross-sectional configuration; An elevator wire rope in which, when viewed in a cross section perpendicular to the longitudinal direction of each of the outer strands, a wire filling rate, which is the ratio of the total cross-sectional area of ​​all wires included in each of the outer strands to the area of ​​a circumscribed circle of each of the outer strands, is 85% or more.

2. Rope heart, and a plurality of steel outer strands disposed around the outer periphery of the rope core; Equipped with Each of the peripheral strands is a central wire; at least one strand layer disposed on the outer periphery of the central strand; It has the at least one wire layer is only an outer layer in contact with the outer periphery of the rope core, The outer layer has a plurality of outer layer wires, An elevator wire rope in which, when viewed in a cross section perpendicular to the longitudinal direction of each of the outer strands, a wire filling rate, which is the ratio of the total cross-sectional area of ​​all wires included in each of the outer strands to the area of ​​a circumscribed circle of each of the outer strands, is 85% or more.

3. Rope heart, and a plurality of steel outer strands disposed around the outer periphery of the rope core; Equipped with Each of the peripheral strands is a central wire; at least one strand layer disposed on the outer periphery of the central strand; It has the at least one wire layer includes an outer layer in contact with an outer periphery of the rope core, The outer layer has a plurality of outer layer wires, When a cross section of each of the outer strands is viewed perpendicular to the longitudinal direction, a wire filling rate, which is the ratio of the total cross-sectional area of ​​all the wires included in each of the outer strands to the area of ​​the circumscribed circle of each of the outer strands, is 85% or more, An elevator wire rope in which each of the outer circumferential strands is not subjected to a deforming process that compresses each of the outer circumferential strands from the outside in the radial direction.

4. Rope heart, and a plurality of steel outer strands disposed around the outer periphery of the rope core; Equipped with Each of the peripheral strands is a central wire; at least one strand layer disposed on the outer periphery of the central strand; It has the at least one wire layer includes an outer layer in contact with an outer periphery of the rope core, The outer layer has a plurality of outer layer wires, When a cross section of each of the outer strands is viewed perpendicular to the longitudinal direction, a wire filling rate, which is the ratio of the total cross-sectional area of ​​all the wires included in each of the outer strands to the area of ​​the circumscribed circle of each of the outer strands, is 85% or more, The elevator wire rope has each of the outer strands being a round wire.

5. 5. The elevator wire rope according to claim 1, wherein the number of the outer layer wires in each of the outer strands is 10 or more.

6. 5. The elevator wire rope according to claim 1, wherein the number of the outer circumferential strands is six or more.

7. baskets, and The main rope that suspends the cage Equipped with 5. An elevator apparatus, wherein the main rope is an elevator wire rope according to any one of claims 1 to 4.

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