Rope and belt made from it

Abstract

In this rope, a fiber core (21) comprises a first layer (31) and a second layer (32) disposed on an outer circumference of the first layer (31). The first layer (31) includes at least one first fiber core strand (33). The second layer (32) includes a plurality of second fiber core strands (34). Each first fiber core strand (33) is formed by rigidifying a first stranded wire made of synthetic fibers with a first resin. Each second fiber core strand (34) is formed by rigidifying second stranded wire made of synthetic fibers with a second resin. The elastic modulus of the first resin is higher than the elastic modulus of the second resin.

Description

Technical Field

[0005]

[0001] The present disclosure relates to a rope and a 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. The diameter of each high-strength synthetic fiber filament is several μm to several tens of μm. (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 the conventional rope as described above, a plurality of high-strength synthetic fiber bundles are twisted together to produce a high-strength synthetic fiber core. At this time, the cross-sectional shape of the high-strength synthetic fiber core is circular. Also, in order to sufficiently bear the tensile load by the high-strength synthetic fiber core, a plurality of high-strength synthetic fiber bundles are twisted loosely.

[0005] However, since each high-strength synthetic fiber bundle is thin and soft, when a plurality of high-strength synthetic fiber bundles are loosely twisted, the cross-sectional shape of the high-strength synthetic fiber core is likely to collapse, and the cross-sectional shape of the high-strength synthetic fiber core may become elliptical instead of circular. In that case, the cross-sectional shape of the rope also becomes elliptical, and the life of the rope may be reduced.

[0006] In contrast, there is a known technique of solidifying twisted wires, which are made by twisting high-strength fiber yarns together, with resin, such as in fiber-reinforced plastics. However, simply solidifying twisted wires with resin makes it difficult for the cross-sectional shape of the twisted wires to change. Therefore, when the structure of the high-strength synthetic fiber core described above is made up of multiple twisted wires arranged in multiple layers, gaps tend to form between the twisted wires, making it difficult to sufficiently increase the amount of high-strength synthetic fiber filling, which may result in the inability to adequately withstand tensile loads.

[0007] This disclosure is made to solve the above-mentioned problems and aims to provide a rope and a belt using the same that can stabilize the cross-sectional shape of the fiber core while ensuring a sufficient amount of synthetic fibers to fill the fiber core. [Means for solving the problem]

[0008] The rope according to this disclosure comprises a fiber core and a plurality of steel strands arranged on the outer circumference of the fiber core, the fiber core having a first layer and a second layer arranged on the outer circumference of the first layer, the first layer having at least one first fiber core strand, and the second layer having a plurality of second fiber core strands, each first fiber core strand being constructed by solidifying a first twisted wire made of synthetic fiber with a first resin, and each second fiber core strand being constructed by solidifying a second twisted wire made of synthetic fiber with a second resin, the modulus of elasticity of the first resin being higher than the modulus of elasticity of the second resin. [Effects of the Invention]

[0009] According to this disclosure, it is possible to stabilize the cross-sectional shape of the fiber core while ensuring a sufficient amount of synthetic fibers filling the fiber core. [Brief explanation of the drawing]

[0010] [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]This is a cross-sectional view of the main rope according to Embodiment 2. [Figure 4] This is a cross-sectional view of the main rope according to Embodiment 3. [Figure 5] This is a cross-sectional view of the main rope according to Embodiment 4. [Figure 6] This is a cross-sectional view of the main rope according to Embodiment 5. [Figure 7] This is a cross-sectional view of the main rope according to Embodiment 6. [Figure 8] This is a cross-sectional view of the belt according to Embodiment 7. [Modes for carrying out the invention]

[0011] The embodiments will be described below with reference to the drawings. Embodiment 1. Figure 1 is a side view showing an elevator according to Embodiment 1. In Figure 1, a machine room 2 is provided above the hoistway 1. A hoisting machine 3 and a deflector wheel 6 are installed in the machine room 2.

[0012] The hoisting machine 3 comprises a hoisting machine body 4 and a drive sheave 5. The hoisting machine body 4 comprises 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 maintains the drive sheave 5 in a stationary state. The hoisting machine brake also brakes the rotation of the drive sheave 5.

[0013] Multiple main ropes 7 are wound around the drive sheave 5 and the deflector wheel 6. Each of the multiple main ropes 7 is an elevator rope.

[0014] The cage 8 and counterweight 9 are suspended within the hoistway 1 by multiple main ropes 7. The cage 8 and counterweight 9 move up and down within the hoistway 1 by rotating the drive sheave 5.

[0015] Inside 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.

[0016] The pair of car guide rails 10 guide the ascending and descending of the car 8. The pair of counterweight guide rails 11 guide the ascending and descending of the counterweight 9.

[0017] 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.

[0018] 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.

[0019] 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. Also, the eight steel strands 22 are twisted together on the outer periphery of the fiber core 21.

[0020] The fiber core 21 is arranged at the center in a cross-section perpendicular to the length direction of the main rope 7. Also, the fiber core 21 has a first layer 31 and a second layer 32. The first layer 31 in Embodiment 1 is composed of one first fiber core strand 33.

[0021] The first fiber core strand 33 is arranged at the center of the fiber core 21 in a cross-section perpendicular to the length direction of the fiber core 21. The shape of the first fiber core strand 33 in a cross-section perpendicular to the length direction of the fiber core 21 is circular.

[0022] The second layer 32 is arranged on the outer periphery of the first layer 31. The second layer 32 has multiple second fiber core strands 34. In Embodiment 1, eight second fiber core strands 34 are twisted together on the outer periphery of the first fiber core strand 33. Thus, the structure of the fiber core 21 is a two-layer twisted structure.

[0023] Each first fiber core strand 33 is constructed by solidifying a first twisted wire made of synthetic fiber with a first resin. Each second fiber core strand 34 is constructed by solidifying a second twisted wire made of synthetic fiber with a second resin. The elastic modulus of the first resin is higher than that of the second resin.

[0024] Each of the first and second strands is composed of multiple yarns twisted together in a single-sided manner. At least some of the yarns constituting the first and second strands are high-strength synthetic fiber yarns. The high-strength synthetic fiber yarn in Embodiment 1 is a synthetic fiber yarn with a tensile strength of 20 cN / dtex or more and a tensile modulus of elasticity of 500 cN / dtex or more. Embodiment 1 Therefore, all the yarns constituting the first and second strands are the high-strength synthetic fiber yarns described above.

[0025] Each steel strand 22 has multiple steel wires. These multiple steel wires include a central wire 24, multiple intermediate wires 25, and multiple outer layer wires 26.

[0026] The central strand 24 is positioned at the center of a cross-section perpendicular to the length of the steel strand 22. Multiple intermediate strands 25 are twisted together around the outer circumference of the central strand 24. In this example, nine intermediate strands 25 are used.

[0027] Multiple outer layer wires 26 are twisted together around the outer circumference of an intermediate layer consisting of multiple intermediate wires 25. In this example, nine outer layer wires 26 are used. That is, in each steel strand 22, the number of intermediate wires 25 and the number of outer layer wires 26 are the same.

[0028] The diameter of each outer layer strand 26 is smaller than the diameter of the central strand 24. The diameter of each intermediate strand 25 is smaller than the diameter of each outer layer strand 26.

[0029] Furthermore, when the loads of the cage 8 and the counterweight 9 are actually applied to the main rope 7, each steel strand 22 is pressed against the outer circumference of the fiber core 21.

[0030] In this type of main rope 7, the first fiber core strand 33 is constructed by hardening a first strand of synthetic fiber with a first resin. In addition, each second fiber core strand 34 is constructed by hardening a second strand of synthetic fiber with a second resin.

[0031] Furthermore, the elastic modulus of the first resin is higher than that of the second resin. In other words, each of the first fiber core strands 33 is less prone to deformation than each of the second fiber core strands 34.

[0032] Therefore, the cross-sectional shape of the fiber core can be stabilized, and the overall cross-sectional shape of the main rope 7 can be made close to a perfect circle. This helps to suppress the reduction in the lifespan of the main rope 7.

[0033] Furthermore, each second fiber core strand 34 is more easily deformed than the first fiber core strand 33. Therefore, each second fiber core strand 34 can deform to some extent to conform to the outer circumference of the first fiber core strand 33, and even in the two-layer fiber core structure 21, gaps are less likely to form between each second fiber core strand 34 and the first fiber core strand 33. Also, gaps are less likely to form between adjacent second fiber core strands 34.

[0034] Therefore, a sufficient amount of synthetic fiber filling can be ensured in the fiber core 21, and the fiber core 21 can adequately bear the tensile load.

[0035] Thus, according to the main rope 7 of Embodiment 1, it is possible to ensure a sufficient amount of synthetic fiber filling in the fiber core 21 while stabilizing the cross-sectional shape of the fiber core 21.

[0036] Furthermore, because the fiber core 21 has a two-layer twisted structure, the first fiber core strand 33 and each of the second fiber core strands 34 can be twisted more loosely compared to a three-strand fiber core. This allows the fiber core 21 to bear tensile loads more effectively.

[0037] Furthermore, the first layer 31 is composed of a single first fiber core strand 33. This simplifies the construction of the first layer 31 and facilitates its manufacture.

[0038] Furthermore, at least some of the yarns constituting the first and second strands are high-strength synthetic fiber yarns. As a result, a lightweight, high-strength main rope 7 can be obtained, and the main rope 7 can be easily applied to high-lift elevators.

[0039] Embodiment 2. Next, Figure 3 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.

[0040] In Embodiment 2, the first layer 31 is constructed by twisting together three first fiber core strands 33. That is, the first layer 31 in Embodiment 2 is a three-strand rope. The cross-sectional shape of the three-strand rope in a cross section perpendicular to the length direction of the fiber core 21 is circular.

[0041] Other configurations in Embodiment 2 are the same as those in Embodiment 1.

[0042] In this type of main rope 7, a three-strand rope is used as the first layer 31. Therefore, the diameter of the first layer 31 can be increased, which in turn increases the diameter of the fiber core 21. This also allows the overall diameter of the main rope 7 to be increased.

[0043] Furthermore, when manufacturing the three-strand rope in Embodiment 2, it is desirable to twist the three first strands together and then solidify them with the first resin. When each first strand is solidified with the first resin and then the three first strands are twisted together, the cross-sectional shape of each first strand is less likely to deform, the amount of voids in the three-strand rope increases, and the amount of synthetic fiber filling decreases by the amount of voids.

[0044] Embodiment 3. Next, Figure 4 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.

[0045] The main rope 7 of Embodiment 3 has a fiber core 21 and a plurality of steel strands 22, in addition to a resin fiber core covering 35. The fiber core covering 35 covers the outer circumference of the fiber core 21. The plurality of steel strands 22 are arranged on the outer circumference of the fiber core 21 via the fiber core covering 35. That is, the fiber core covering 35 is interposed between the fiber core 21 and the plurality of steel strands 22.

[0046] The material for the fiber core covering 35 can be resin or rubber. Specifically, for example, polyethylene, polypropylene, polyvinyl chloride, polyamide, or polyurethane elastomer can be used as the material for the fiber core covering 35.

[0047] Furthermore, the fiber core coating 35 is provided on the outer circumference of the fiber core 21 by a manufacturing process similar to the process of providing coating to cables. That is, the fiber core coating 35 is provided on the outer circumference of the fiber core 21 by extrusion coating molding with the fiber core 21 running through the center.

[0048] Other configurations in Embodiment 3 are the same as those in Embodiment 1.

[0049] In this type of main rope 7, a fiber core covering 35 is interposed between the fiber core 21 and multiple steel strands 22. This suppresses wear and damage to the fiber core 21, thereby extending the lifespan of the main rope 7.

[0050] In addition, a fiber core covering 35 may be provided on the outer circumference of the fiber core 21 in Embodiment 1.

[0051] Embodiment 4. Next, Figure 5 is a cross-sectional view of the main rope 7 according to Embodiment 4, showing a cross-section perpendicular to the longitudinal direction of the main rope 7.

[0052] In Embodiment 4, each steel strand 22 is compressed from the radially outer side, thereby deforming the cross-sectional shape of each outer layer wire 26 perpendicular to the longitudinal direction of each steel strand 22. As a result, the cross-sectional shape perpendicular to the longitudinal direction of each steel strand 22 is made circular.

[0053] Other configurations in Embodiment 4 are the same as those in Embodiment 3.

[0054] The same effects as in Embodiment 3 can be obtained with the main rope 7 according to this Embodiment 4.

[0055] Note that each steel strand 22 in Embodiments 1 to 3 may be the same as the steel strand 22 in Embodiment 4.

[0056] Embodiment 5. Next, Figure 6 is a cross-sectional view of the main rope 7 according to Embodiment 5, showing a cross-section perpendicular to the longitudinal direction of the main rope 7.

[0057] In Embodiment 5, twelve steel strands 22 are used.

[0058] Other configurations in Embodiment 5 are the same as those in Embodiment 4.

[0059] In such a main rope 7, the cross-sectional area of ​​the fiber core 21 can be made relatively larger than the total cross-sectional area of ​​all the steel strands 22. This makes the main rope 7 even lighter and stronger.

[0060] Embodiment 6. Next, Figure 7 is a cross-sectional view of the main rope 7 according to Embodiment 6, showing a cross-section perpendicular to the longitudinal direction of the main rope 7.

[0061] The main rope 7 of Embodiment 6 has a fiber core 21, a plurality of steel strands 22, and a fiber core covering 35, in addition to a resin outer covering 36. The outer covering 36 covers the outer periphery of the steel strand layer made up of the plurality of steel strands 22.

[0062] An elastomer is used as the material for the outer periphery coating 36. Furthermore, an ether-based thermoplastic polyurethane elastomer is preferred as the elastomer from the viewpoint of high friction, abrasion resistance, and hydrolysis resistance. The outer periphery coating 36 may also contain a flame retardant. This makes the outer periphery coating 36 flame-retardant.

[0063] Other configurations in Embodiment 6 are the same as those in Embodiment 5.

[0064] 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. In addition, wear and damage to the drive sheave 5 and other pulleys that come into contact with the main rope 7 can also be suppressed.

[0065] In addition, the main rope 7 of embodiments 1 to 5 may be provided with an outer covering 36.

[0066] Embodiment 7. Next, Figure 8 is a cross-sectional view of the belt according to Embodiment 7, showing a cross-section perpendicular to the length direction of the belt. In Figure 8, the belt 41 can be used in place of the main rope 7 of the elevator shown in Figure 1. The belt 41 also has multiple ropes 42 and a rope covering 43.

[0067] Multiple 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 8. In Embodiment 7, six ropes 42 are used.

[0068] The configuration of each rope 42 is the same as that of the main rope 7 in Embodiment 5 shown in Figure 6. The multiple ropes 42 function as reinforcing members.

[0069] The rope covering 43 covers the entire group of ropes 42. That is, all the ropes 42 are integrated by the rope covering 43.

[0070] The rope covering 43 is made of an elastomer. From the viewpoint of high friction, abrasion resistance, and hydrolysis resistance, an ether-based thermoplastic polyurethane elastomer is preferred. The rope covering 43 may also contain a flame retardant. This makes the rope covering 43 flame-retardant.

[0071] In this type of belt 41, the amount of synthetic fiber filling in the fiber core 21 of each rope 42 is sufficiently ensured, while stabilizing the cross-sectional shape of each rope 42. As a result, the belt 41 as a whole can adequately bear tensile loads and its lifespan can be extended.

[0072] The number of ropes 42 included in the belt 41 is not particularly limited and may be 5 or fewer, or 7 or more.

[0073] Furthermore, the configuration of each rope 42 included in the belt 41 may be the same as in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 6.

[0074] Furthermore, the belt 41 may include multiple types of ropes 42, each having at least one difference in composition and diameter.

[0075] Furthermore, the belt 41 may include ropes other than those shown in Embodiments 1 to 6.

[0076] Furthermore, in embodiments 1 to 7, the structure of each fiber core 21 may be a multilayer twisted structure of three or more layers. In that case, if the elastic modulus of the first resin used in the first fiber core strand of the first layer, which is one of the multiple layers, is higher than the elastic modulus of the second resin used in the second fiber core strand of the second layer adjacent to the outside of the first layer, the same effect as described above can be obtained.

[0077] Alternatively, each fiber core strand placed in the outermost layer of the fiber core 21 may be a three-strand rope.

[0078] Furthermore, in embodiments 1 to 7, the number of steel strands 22 arranged on the outer circumference of each fiber core 21 can be changed as appropriate and is not limited to 8 or 12.

[0079] Furthermore, in embodiments 1 to 7, 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] The rope may also be another elevator rope besides the main rope 7, such as a compensator rope or governor rope. The belt may also be, for example, a compensator belt used in place of a compensator rope, or a governor belt used in place of a governor rope.

[0082] Furthermore, the rope is not limited to elevator ropes; it may also be a rope used for other purposes, such as a crane rope used in a lifting device. Similarly, the belt may be, for example, a crane belt used in a lifting device. [Explanation of Symbols]

[0083] 7 Main rope, 21 Fiber core, 22 Steel strand, 31 First layer, 32 Second layer, 33 First fiber core strand, 34 Second fiber core strand, 35 Fiber core covering, 36 Outer covering, 41 Belt, 42 Rope, 43 Rope covering.

Claims

1. Fiber core, and Multiple steel strands arranged on the outer circumference of the aforementioned fiber core Equipped with, The fiber core has a first layer and a second layer disposed on the outer periphery of the first layer. The first layer has at least one first fiber core strand, The aforementioned second layer has multiple second fiber core strands, Each of the first fiber core strands is constructed by solidifying a first twisted wire made of synthetic fiber with a first resin. Each of the aforementioned second fiber core strands is constructed by solidifying a second twisted wire made of synthetic fiber with a second resin. A rope in which the elastic modulus of the first resin is higher than that of the second resin.

2. The rope according to claim 1, wherein the first layer is located at the center of the fiber core in a cross section perpendicular to the longitudinal direction of the fiber core, and is composed of a single strand of the first fiber core.

3. The rope according to claim 1, wherein the first layer is positioned at the center of the fiber core in a cross section perpendicular to the longitudinal direction of the fiber core, and is formed by twisting together three strands of the first fiber core.

4. The rope according to any one of claims 1 to 3, wherein at least a portion of the yarns constituting the first strand and the second strand are high-strength synthetic fiber yarns, which are synthetic fiber yarns having a tensile strength of 20 cN / dtex or more and a tensile modulus of elasticity of 500 cN / dtex or more.

5. A resin fiber core covering that covers the outer circumference of the fiber core. Furthermore, The rope according to any one of claims 1 to 3, wherein the plurality of steel strands are arranged on the outer circumference of the fiber core via the fiber core covering.

6. A resin outer covering covers the outer periphery of the steel strand layer, which consists of the aforementioned plurality of steel strands. The rope according to any one of claims 1 to 3, further comprising the above.

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

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