Elevator rope and elevator belt using the same

Abstract

An elevator rope according to the present invention comprises a fiber core and a plurality of steel strands. The fiber core includes a plurality of synthetic fiber filaments. The plurality of steel strands are arranged around the periphery of the fiber core. The plurality of synthetic fiber filaments include a plurality of differently shaped filaments. The cross-sectional shape of each differently shaped filament is shaped such that the spaces between the fibers are smaller than the spaces between the fibers when the cross-sectional shape is circular.

Description

Technical Field

[0001] The present disclosure relates to an elevator rope and an elevator belt using the same.

Background Art

[0002] In a conventional hybrid rope, a plurality of side strands are twisted around the outer periphery of a high-strength synthetic fiber core. The high-strength synthetic fiber core has a high-strength synthetic fiber rope. The high-strength synthetic fiber rope has a plurality of high-strength synthetic fiber bundles. Each high-strength synthetic fiber bundle is composed of a plurality of high-strength synthetic fiber filaments (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an elevator with a long lifting and lowering stroke, since the total length of the elevator rope also increases, when a conventional hybrid rope is used as the elevator rope, the influence of elastic elongation becomes large, and the vibration of the car when passengers get on and off may become large. In addition, the influence of rope elongation over time also becomes large.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain an elevator rope capable of suppressing elongation during use and an elevator belt using the same.

Means for Solving the Problems

[0006] The elevator rope according to this disclosure comprises a fiber core containing a plurality of synthetic fiber filaments, and a plurality of steel strands arranged on the outer circumference of the fiber core, wherein the plurality of synthetic fiber filaments include a plurality of irregularly shaped filaments, and the cross-sectional shape of each irregularly shaped filament is irregularly shaped such that the interfiber gap is reduced compared to the interfiber gap in a circular cross-section. [Effects of the Invention]

[0007] The elevator rope and elevator belt using the same described herein can suppress elongation during use. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view showing an elevator according to Embodiment 1. [Figure 2] This is a cross-sectional view of the main rope in Figure 1. [Figure 3] Figure 2 is a cross-sectional view showing the first example of the cross-sectional structure of a fiber core. [Figure 4] Figure 2 is a cross-sectional view showing a second example of the cross-sectional structure of a fiber core. [Figure 5] This is a cross-sectional view showing the cross-sectional structure of a fiber core according to an comparative example. [Figure 6] This is a cross-sectional view showing a first modified example of the main rope of Embodiment 1. [Figure 7] This is a cross-sectional view showing a second modified example of the main rope of Embodiment 1. [Figure 8] This is a cross-sectional view of the main rope according to Embodiment 2. [Figure 9] This is a cross-sectional view of the main rope according to Embodiment 3. [Figure 10] This is a cross-sectional view of the main rope according to Embodiment 4. [Figure 11] This is a cross-sectional view of the belt according to Embodiment 5. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. Embodiment 1. FIG. 1 is a side view showing an elevator according to Embodiment 1. In FIG. 1, a machine room 2 is provided above a hoistway 1. A hoisting machine 3 and a deflecting sheave 6 are installed in the machine room 2.

[0010] The hoisting machine 3 has a hoisting machine main body 4 and a drive sheave 5. The hoisting machine main body 4 has a hoisting machine motor (not shown) and a hoisting machine brake (not shown). The hoisting machine motor rotates the drive sheave 5. The hoisting machine brake holds the drive sheave 5 in a stationary state. Further, the hoisting machine brake brakes the rotation of the drive sheave 5.

[0011] A plurality of main ropes 7 are wound around the drive sheave 5 and the deflecting sheave 6. Each of the plurality of main ropes 7 is an elevator rope.

[0012] The car 8 and the counterweight 9 are suspended in the hoistway 1 by a plurality of main ropes 7. Further, the car 8 and the counterweight 9 move up and down in the hoistway 1 by rotating the drive sheave 5.

[0013] In the hoistway 1, a pair of car guide rails 10 and a pair of counterweight guide rails 11 are installed. In FIG. 1, only one side of the car guide rail 10 and one side of the counterweight guide rail 11 are shown.

[0014] The pair of car guide rails 10 guides the movement of the car 8 up and down. The pair of counterweight guide rails 11 guides the movement of the counterweight 9 up and down.

[0015] The car 8 has a car frame 12 and a car compartment 13. A plurality of main ropes 7 are connected to the car frame 12. The car compartment 13 is supported by the car frame 12.

[0016] FIG. 2 is a cross-sectional view of the main rope 7 in FIG. 1, showing a cross-section perpendicular to the length direction of the main rope 7. The main rope 7 of Embodiment 1 is an 8×S(19) type rope conforming to JIS G 3525.

[0017] The main rope 7 has a fiber core 21 and a plurality of steel strands 22. In this example, eight steel strands 22 are arranged on the outer periphery of the fiber core 21. Further, the eight steel strands 22 are twisted together on the outer periphery of the fiber core 21.

[0018] The fiber core 21 is arranged at the center in a cross-section perpendicular to the length direction of the main rope 7. Further, the fiber core 21 is formed by twisting together a plurality of fiber core strands 23. In this example, three fiber core strands 23 are used. That is, the fiber core 21 of Embodiment 1 is a so-called three-strand rope.

[0019] Each steel strand 22 has a plurality of steel wire elements. The plurality of steel wire elements include a center wire element 24, a plurality of intermediate wire elements 25, and a plurality of outer layer wire elements 26.

[0020] The center wire element 24 is arranged at the center in a cross-section perpendicular to the length direction of the steel strand 22. The plurality of intermediate wire elements 25 are twisted together on the outer periphery of the center wire element 24. In this example, nine intermediate wire elements 25 are used.

[0021] The plurality of outer layer wire elements 26 are twisted together on the outer periphery of an intermediate layer composed of the plurality of intermediate wire elements 25. In this example, nine outer layer wire elements 26 are used. That is, in each steel strand 22, the number of intermediate wire elements 25 is the same as the number of outer layer wire elements 26.

[0022] The diameter of each outer layer wire element 26 is smaller than the diameter of the center wire element 24. The diameter of each intermediate wire element 25 is smaller than the diameter of each outer layer wire element 26.

[0023] When the loads of the basket 8 and the counterweight 9 actually act on the main rope 7, each steel strand 22 is pressed against the outer periphery of the fiber core 21.

[0024] Here, each fiber core strand 23 is composed of multiple yarns twisted together. Each yarn is an aggregate of multiple synthetic fiber filaments. That is, the fiber core 21 contains multiple synthetic fiber filaments. Furthermore, the fiber core 21 is composed of bundles of multiple synthetic fiber filaments.

[0025] Figure 3 is a cross-sectional view showing a first example of the cross-sectional structure of the fiber core 21 in Figure 2. Figure 4 is a cross-sectional view showing a second example of the cross-sectional structure of the fiber core 21 in Figure 2. Figures 3 and 4 show enlarged views of a portion of the cross-section of the fiber core 21 perpendicular to the longitudinal direction of the fiber core 21.

[0026] Multiple synthetic fiber filaments include multiple irregularly shaped filaments 27. In Embodiment 1, all of the multiple synthetic fiber filaments are irregularly shaped filaments 27.

[0027] In the first example shown in Figure 3, the cross-sectional shape of each irregularly shaped filament 27 is triangular. In this example, the cross-sectional shape of each irregularly shaped filament 27 is an equilateral triangle.

[0028] In the second example shown in Figure 4, the cross-sectional shape of each irregularly shaped filament 27 is hexagonal. In this example, the cross-sectional shape of each irregularly shaped filament 27 is a regular hexagon.

[0029] Figure 5 is a cross-sectional view showing the cross-sectional structure of the fiber core according to the comparative example. In the comparative example, the cross-sectional shape of each fiber filament 28 is circular.

[0030] As can be seen by comparing Figures 3 and 4 with Figure 5, the cross-sectional shape of each deformed filament 27 is deformed from a circular shape so that the interfiber voids are reduced compared to the interfiber voids in a circular cross-section.

[0031] In other words, in the comparative example, adjacent fiber filaments 28 are in point contact or line contact with each other, resulting in more interfiber voids than in the first and second examples. In contrast, in the first and second examples, the areas of surface contact between adjacent irregularly shaped filaments 27 increase, resulting in fewer interfiber voids than in the comparative example.

[0032] Furthermore, high-strength synthetic fiber filaments are used for each of the irregularly shaped filaments 27. High-strength synthetic fiber filaments are synthetic fiber filaments with a tensile strength of 20 cN / dtex or more and a tensile modulus of elasticity of 500 cN / dtex or more.

[0033] Furthermore, the material used for each irregularly shaped filament 27 may be, for example, aramid fiber, PBO (poly-paraphenylenebenzobisoxazole) fiber, or carbon fiber.

[0034] In such a main rope 7, the fiber core 21 contains multiple irregularly shaped filaments 27. Furthermore, the cross-sectional shape of each irregularly shaped filament 27 is modified so that the interfiber voids are smaller than those in a circular cross-section.

[0035] Therefore, when the main rope 7 is in use, the fiber core 21 is subjected to a compressive force from the radially outward direction, and the contraction of the diameter of the fiber core 21 is suppressed. This suppresses the elongation of the main rope 7 during use. As a result, vibrations of the car 8 when passengers board and alight can be suppressed.

[0036] Furthermore, it is possible to suppress the elongation of the main rope 7 over time, thereby reducing the effort required for maintenance and inspection.

[0037] Furthermore, the cross-sectional shape of each irregularly shaped filament 27 is more preferably polygonal, and the elongation of the main rope 7 during use can be suppressed by the simple configuration. Moreover, the cross-sectional shape of each irregularly shaped filament 27 is even more preferably a regular polygon with 6 or fewer vertices.

[0038] Furthermore, each of the irregularly shaped filaments 27 is made of high-strength synthetic fiber filament, which has a tensile strength of 20 cN / dtex or more and a tensile modulus of elasticity of 500 cN / dtex or more. As a result, a lightweight, high-strength main rope 7 can be obtained, and the main rope 7 can be easily applied to elevators with high lifting heights.

[0039] Figure 6 is a cross-sectional view showing a first modified example of the main rope 7 of Embodiment 1. In the first modified example, each steel strand 22 is compressed from the radially outer side, so that the cross-sectional shape of each steel strand 22 perpendicular to the longitudinal direction is made circular. That is, the cross-sectional shape of each steel strand 22 is deformed.

[0040] The same effects as in Embodiment 1 can be obtained with the main rope 7 according to this first modified example.

[0041] Furthermore, the number of steel strands 22 is not limited to eight.

[0042] Figure 7 is a cross-sectional view showing a second modified example of the main rope 7 of Embodiment 1. In the second modified example, twelve steel strands 22 are used. Furthermore, the cross-sectional shape of each steel strand 22 is modified, similar to the first modified example.

[0043] The same effects as in Embodiment 1 can be obtained with the main rope 7 according to this second modified example.

[0044] Embodiment 2. Next, Figure 8 is a cross-sectional view of the main rope 7 according to Embodiment 2, showing a cross-section perpendicular to the longitudinal direction of the main rope 7. The main rope 7 of Embodiment 2 has a core coating 35 in addition to a fiber core 21 and a plurality of steel strands 22. The core coating 35 covers the outer circumference of the fiber core 21. That is, the core coating 35 is interposed between the fiber core 21 and the plurality of steel strands 22.

[0045] A thermoplastic resin can be used as the material for the core coating 35. Specifically, for example, polyethylene, polypropylene, polyvinyl chloride, polyamide, or polyurethane elastomer can be used as the material for the core coating 35.

[0046] Furthermore, the core coating 35 is applied to the outer circumference of the fiber core 21 by a manufacturing process similar to that used for applying coatings to cables. Specifically, the core coating 35 is applied to the outer circumference of the fiber core 21 by extrusion molding that passes through the fiber core 21.

[0047] Other configurations in Embodiment 2 are the same as those in Embodiment 1.

[0048] In this type of main rope 7, the three gaps between adjacent fiber core strands 23 on the outer circumference of the fiber core 21 are each filled by the core coating 35. As a result, the gaps within the fiber core 21 can be reduced, and the elongation of the main rope 7 can be further suppressed.

[0049] Furthermore, since the fiber core 21 does not come into direct contact with the multiple steel strands 22, wear and damage to the fiber core 21 can be suppressed.

[0050] Furthermore, the main rope 7 of the first modified example shown in Figure 6 may be provided with a core coating 35.

[0051] Furthermore, the main rope 7 of the second modified example shown in Figure 7 may be provided with a core coating 35.

[0052] Embodiment 3. Next, Figure 9 is a cross-sectional view of the main rope 7 according to Embodiment 3, showing a cross-section perpendicular to the longitudinal direction of the main rope 7. In the main rope 7 of Embodiment 3, the outer circumference of the layer consisting of multiple steel strands 22 as in the second modified example shown in Figure 7 is covered with an outer layer coating 36.

[0053] A thermoplastic resin can be used as the material for the outer layer coating 36. Specifically, an ether-based thermoplastic polyurethane elastomer is preferred as the material for the outer layer coating 36 from the viewpoint of high friction, abrasion resistance, and hydrolysis resistance. The outer layer coating 36 may also contain a flame retardant. This makes the outer layer coating 36 flame-retardant.

[0054] Other configurations in Embodiment 3 are the same as those in the second modified example.

[0055] In this type of main rope 7, since the multiple steel strands 22 do not come into direct contact with the drive sheave 5, wear and damage to the multiple steel strands 22 can be suppressed.

[0056] Furthermore, the main rope 7 of Embodiment 1 shown in Figure 2 may be provided with an outer layer coating 36.

[0057] Furthermore, the main rope 7 of the first modified example shown in Figure 6 may be provided with an outer layer coating 36.

[0058] Furthermore, the main rope 7 of Embodiment 2 shown in Figure 8 may be provided with an outer layer coating 36.

[0059] Embodiment 4. Next, Figure 10 is a cross-sectional view of the main rope 7 according to Embodiment 4, showing a cross-section perpendicular to the length direction of the main rope 7. In the main rope 7 of Embodiment 4, the fiber core 21 in the second modified example shown in Figure 7 is composed of 19 fiber core strands 23. In addition, the outer circumference of the fiber core 21 is covered with a core coating 35.

[0060] Other configurations in Embodiment 4 are the same as those in the second modified example.

[0061] Thus, the fiber core 21 may be composed of a large number of fiber core strands 23, and the same effects as in Embodiment 1 can be obtained.

[0062] In addition, the main rope 7 of Embodiment 4 may be provided with an outer layer coating 36.

[0063] Furthermore, the core coating 35 in Embodiment 4 may be omitted.

[0064] Embodiment 5. Next, Figure 11 is a cross-sectional view of the belt according to Embodiment 5, showing a cross-section perpendicular to the length direction of the belt. In Figure 11, the belt 41 can be used in place of the main elevator rope 7 shown in Figure 1. The belt 41 also has multiple elevator ropes 42 and a rope covering 43.

[0065] Multiple elevator ropes 42 are arranged at equal intervals from each other in the width direction of the belt 41. The width direction of the belt 41 is the left-right direction in Figure 11. In Embodiment 5, four elevator ropes 42 are used.

[0066] The configuration of each elevator rope 42 is the same as that of the main rope 7 in Embodiment 1 shown in Figure 2. The multiple elevator ropes 42 function as structural members.

[0067] The rope covering 43 covers the entire group of elevator ropes 42. In other words, multiple elevator ropes 42 are integrated together by the rope covering 43.

[0068] A thermoplastic resin is used as the material for the rope covering 43. Specifically, an ether-based thermoplastic polyurethane elastomer is preferred as the material for the rope covering 43 from the viewpoint of high friction, abrasion resistance, and hydrolysis resistance. The rope covering 43 may also contain a flame retardant. This makes the rope covering 43 flame-retardant.

[0069] Even with such a belt 41, the elongation of each elevator rope 42 during use can be suppressed. As a result, vibrations of the elevator car 8 when passengers get on and off can be suppressed.

[0070] Furthermore, it is possible to suppress the elongation of the elevator rope 42 over time, thereby reducing the effort required for maintenance and inspection.

[0071] The number of elevator ropes 42 included in the belt 41 is not particularly limited and may be three or fewer, or five or more.

[0072] Furthermore, the configuration of each elevator rope 42 included in the belt 41 may be the same as that of the first modified example shown in Figure 6, the second modified example shown in Figure 7, the second embodiment shown in Figure 8, the third embodiment shown in Figure 9, or the fourth embodiment shown in Figure 10.

[0073] Furthermore, the belt 41 may include multiple types of elevator ropes 42, each having at least one difference in configuration and diameter.

[0074] Furthermore, the belt 41 may include elevator ropes that do not contain the irregularly shaped filaments 27. That is, it is sufficient that at least one of the multiple elevator ropes 42 included in the belt 41 contains the irregularly shaped filaments 27.

[0075] Furthermore, in embodiments 1 to 5, only a portion of all the synthetic fiber filaments contained in the fiber core 21 may be made into irregularly shaped filaments 27.

[0076] Furthermore, in embodiments 1 to 5, the cross-sectional shape of each irregularly shaped filament 27 is not limited to a polygon.

[0077] Furthermore, in embodiments 1 to 5, multiple types of irregularly shaped filaments 27 having different cross-sectional shapes may be combined.

[0078] Furthermore, in embodiments 1 to 5, the number of fiber core strands 23 contained in the fiber core 21 is not particularly limited.

[0079] Furthermore, in embodiments 1 to 5, the overall layout of the elevator is not limited to the layout shown in Figure 1. For example, the roping method may be a 2:1 roping method.

[0080] Furthermore, the elevator may be a machine-room-less elevator, a double-deck elevator, or a single-shaft multi-car elevator. In a single-shaft multi-car elevator, the upper car and the lower car, located directly below the upper car, each move independently up and down a common hoistway.

[0081] Furthermore, the elevator rope may be another elevator rope besides the main rope 7, such as a compensator rope or a governor rope. Also, the belt may be, for example, a compensator belt used in place of a compensator rope, or a governor belt used in place of a governor rope. [Explanation of Symbols]

[0082] 7 Main rope (elevator rope), 21 Fiber core, 22 Steel strand, 27 Irregular filament (synthetic fiber filament), 41 Belt, 42 Elevator rope, 43 Rope sheath.

Claims

1. A fiber core containing multiple synthetic fiber filaments, and Multiple steel strands arranged on the outer circumference of the aforementioned fiber core Equipped with, The aforementioned plurality of synthetic fiber filaments include a plurality of irregularly shaped filaments, An elevator rope in which the cross-sectional shape of each of the aforementioned irregularly shaped filaments is modified such that the interfiber voids are reduced compared to the interfiber voids in a circular cross-section.

2. The elevator rope according to claim 1, wherein the cross-sectional shape of each of the aforementioned irregularly shaped filaments is polygonal.

3. The elevator rope according to claim 1, wherein each of the aforementioned irregularly shaped filaments is a high-strength synthetic fiber filament having a tensile strength of 20 cN / dtex or more and a tensile modulus of elasticity of 500 cN / dtex or more.

4. Multiple elevator ropes arranged at intervals from each other, The resin rope covering that covers the aforementioned multiple elevator ropes Equipped with, An elevator belt in which at least one of the plurality of elevator ropes is an elevator rope according to any one of claims 1 to 3.

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