JP7195483B1 - Rope and belt using it - Google Patents

Abstract

The rope has a core and a plurality of steel strands. A plurality of steel strands are twisted around the outer circumference of the cord. The core includes sheath-core fiber filaments. A core-sheath structure fiber filament has a filament core and a sheath body. The sheath body covers the outer circumference of the filament core. The filament core is composed of a first material. The sheath body is made of the second material. The second material is a material different from the first material.

Description

TECHNICAL FIELD The present disclosure relates to a rope and a belt using the same.

In conventional hybrid ropes, multiple side strands are twisted around a high-strength synthetic fiber core. The high strength synthetic fiber core has high strength synthetic fiber ropes. A high-strength synthetic fiber rope has a plurality of high-strength synthetic fiber bundles. Each high-strength synthetic fiber bundle consists of a plurality of high-strength synthetic fiber filaments (see, for example, Patent Document 1).

Japanese Patent No. 5478718

In the conventional hybrid rope as described above, when the high-strength synthetic fiber core is repeatedly bent and stretched over time, the plurality of high-strength synthetic fiber filaments are repeatedly rubbed against each other. This causes the plurality of high-strength synthetic fiber filaments to wear or break, reducing the strength of the high-strength synthetic fiber core.

The present disclosure has been made to solve the problems described above, and an object thereof is to obtain a rope and a belt using the same that can suppress deterioration in the strength of the core rope over time.

A rope according to the present disclosure includes a core rope and a plurality of steel strands twisted around the outer circumference of the core rope, the core rope including a sheath-core fiber filament, the sheath-core fiber filament comprising: , a filament core, and a sheath covering the outer periphery of the filament core, wherein the filament core is made of a first material, and the sheath is made of a second material different from the first material. there is

Advantageous Effects of Invention According to the present disclosure, it is possible to obtain a rope and a belt using the same that can suppress deterioration in the strength of the core rope over time.

1 is a side view showing an elevator according to Embodiment 1; FIG. Figure 2 is a cross-sectional view of the main rope of Figure 1; 3 is a cross-sectional view of a core-sheath structure fiber filament included in the core strand of FIG. 2; FIG. FIG. 4 is a cross-sectional view showing a first modification of the main rope of Embodiment 1; FIG. 5 is a cross-sectional view showing a second modification of the main rope of Embodiment 1; FIG. 5 is a cross-sectional view of a main rope according to Embodiment 2; FIG. 8 is a cross-sectional view of a main rope according to Embodiment 3; FIG. 11 is a cross-sectional view of a main rope according to Embodiment 4; FIG. 11 is a cross-sectional view of a belt according to Embodiment 5;

Embodiments will be described below with reference to the drawings.
Embodiment 1.
1 is a side view showing an elevator according to Embodiment 1. FIG. In FIG. 1, a machine room 2 is provided above the hoistway 1 . A hoist 3 and a deflector 6 are installed in the machine room 2 .

The hoist 3 has a hoist body 4 and a drive sheave 5 . The hoist main body 4 has a hoist motor (not shown) and a hoist brake (not shown). The hoist motor rotates the drive sheave 5 . The hoist brake keeps the drive sheave 5 stationary. Also, the hoist brake brakes the rotation of the drive sheave 5 .

A plurality of main ropes 7 are wound around the drive sheave 5 and the deflector wheel 6 . Each of the plurality of main ropes 7 is an elevator rope.

A car 8 and a 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 .

A pair of car guide rails 10 and a pair of counterweight guide rails 11 are installed in the hoistway 1 . In FIG. 1, only one car guide rail 10 and one counterweight guide rail 11 are shown.

A pair of car guide rails 10 guides the car 8 to move up and down. A pair of counterweight guide rails 11 guide the lifting and lowering of the counterweight 9 .

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

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

The main rope 7 has a core rope 21 and a plurality of steel strands 22 . In this example, eight steel strands 22 are twisted around the core rope 21 .

The core 21 is centrally located in a cross-section perpendicular to the length of the main rope 7 . The core rope 21 is constructed by twisting a plurality of core rope strands 23 together. In this example, three core strands 23 are used. That is, the core rope 21 of Embodiment 1 is a so-called three-strand rope. The core 21 may be impregnated with grease or oil.

Each steel strand 22 has a plurality of steel strands. The plurality of steel strands includes a center strand 24, a plurality of intermediate strands 25, and a plurality of outer layer strands 26. As shown in FIG.

The center strand 24 is arranged at the center of the cross section perpendicular to the length direction of the steel strand 22 . A plurality of intermediate strands 25 are twisted around the center strand 24 . In this example, nine intermediate strands 25 are used.

A plurality of outer layer strands 26 are twisted around the outer periphery of an intermediate layer composed of a plurality of intermediate strands 25 . In this example, nine outer layer strands 26 are used. That is, in each steel strand 22, the number of intermediate strands 25 and the number of outer layer strands 26 are the same.

The diameter of each outer layer strand 26 is smaller than the diameter of the center strand 24 . The diameter of each intermediate strand 25 is smaller than the diameter of each outer layer strand 26 .

When the load of the cage 8 and the counterweight 9 actually acts on the main rope 7 , each steel strand 22 is pressed against the outer circumference of the core rope 21 .

Here, each core strand 23 is constructed by twisting a plurality of yarns. Each yarn is an assembly of multiple fiber filaments. All of the plurality of fiber filaments are core-sheath structure fiber filaments 30 as shown in FIG. That is, the core rope 21 of Embodiment 1 includes a plurality of core-sheath structure fiber filaments 30 .

It should be noted that only some of all the fiber filaments included in the core rope 21 may be used as the core-sheath structure fiber filaments 30 .

FIG. 3 shows a cross section perpendicular to the length direction of the core-sheath structure fiber filament 30 . In FIG. 3, the core-sheath structure fiber filament 30 has a filament core 31 and a cylindrical sheath body 32 . The sheath body 32 covers the outer circumference of the filament core 31 .

The filament core 31 is made of the first material. The sheath body 32 is made of the second material. The second material is a material different from the first material.

The elastic modulus of the first material is higher than the elastic modulus of the second material. The tensile strength of the first material is higher than the tensile strength of the second material. The wear resistance of the second material is higher than the wear resistance of the first material. The first material is, for example, polyarylate resin. The second material is polyester resin, for example. As the polyester resin, polyethylene terephthalate is particularly preferred.

The diameter of the core-sheath structure fiber filament 30 is several μm or more and several hundred μm or less. Moreover, a plurality of types of core-sheath structure fiber filaments 30 having different diameters may be used.

In such a main rope 7 , the core rope 21 includes a plurality of core-sheath structure fiber filaments 30 . In each core-sheath structure fiber filament 30, the filament core 31 is made of the first material, and the sheath body 32 is made of the second material.

Therefore, it is possible to select the first material suitable for the filament core 31 and the second material suitable for the sheath 32, respectively, so that deterioration in the strength of the core rope 21 over time can be suppressed. As a result, it is possible to suppress a decrease in the load applied to the core rope 21 over a long period of time.

Also, the elastic modulus of the first material is higher than the elastic modulus of the second material. Therefore, the filament core 31 can sufficiently support the load.

Also, the wear resistance of the second material is higher than the wear resistance of the first material. Therefore, even if the main rope 7 is repeatedly bent and stretched, the wear and breakage of each core-sheath structure fiber filament 30 can be more reliably suppressed.

Moreover, by using a polyarylate resin as the first material, the load can be supported more reliably by the filament core 31 .

Moreover, by using a polyester resin as the second material, the wear resistance of each core-sheath structure fiber filament 30 can be more reliably improved.

Further, since the core rope 21 made of fiber and the plurality of steel strands 22 are combined, the mass-specific strength of each main rope 7 can be increased.

FIG. 4 is a cross-sectional view showing a first modification of the main rope 7 of Embodiment 1. As shown in FIG. In the first modification, each steel strand 22 is compressed from the outside in the radial direction so that the cross-sectional shape of each steel strand 22 perpendicular to the length direction is circular. That is, the cross-sectional shape of each steel strand 22 is deformed.

With the main rope 7 according to the first modification, the same effects as those of the first embodiment can be obtained.

The number of the core strands 23 included in the core rope 21 is not limited to three.

Also, the number of steel strands 22 is not limited to eight.

FIG. 5 is a cross-sectional view showing a second modification of the main rope 7 of Embodiment 1. As shown in FIG. In a second variant, twelve steel strands 22 are used. Also, the cross-sectional shape of each steel strand 22 is deformed as in the first modification.

With the main rope 7 according to the second modification, the same effects as those of the first embodiment can be obtained.

Embodiment 2.
Next, FIG. 6 is a cross-sectional view of the main rope 7 according to Embodiment 2, showing a cross section perpendicular to the length direction of the main rope 7. As shown in FIG. The main rope 7 of Embodiment 2 has a core coating 35 in addition to the core 21 and the plurality of steel strands 22 . A core wire coating 35 covers the outer circumference of the core wire 21 . That is, the core coating 35 is interposed between the core 21 and the plurality of steel strands 22 .

Resin or rubber can be used as the material for the cord coating 35 . Specifically, polyethylene, polypropylene, polyvinyl chloride, polyamide, or polyurethane elastomer can be used as the material of the core coating 35, for example.

Moreover, the core wire coating 35 is provided on the outer periphery of the core wire 21 by the same manufacturing process as that for coating the cables. That is, the core wire coating 35 is applied to the outer periphery of the core wire 21 by extrusion coating the core wire 21 through the center.

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

In such a main rope 7 , three gaps between adjacent core rope strands 23 on the outer circumference of the core rope 21 are filled with core rope coatings 35 . Therefore, the gap in the core rope 21 can be reduced, and unnecessary elongation of the main rope 7 can be suppressed.

Moreover, since the core rope 21 does not come into direct contact with the plurality of steel strands 22, wear and damage to the core rope 21 can be suppressed.

It should be noted that the main rope 7 of the first modified example shown in FIG. 4 may be provided with a core cord coating 35 .

Also, the core rope coating 35 may be provided on the main rope 7 of the second modification shown in FIG.

Embodiment 3.
Next, FIG. 7 is a cross-sectional view of the main rope 7 according to Embodiment 3, showing a cross section perpendicular to the length direction of the main rope 7. As shown in FIG. In the main rope 7 of Embodiment 3, the outer circumference of the layer composed of the plurality of steel strands 22 in the second modification shown in FIG. 5 is covered with the outer layer coating 36 .

Elastomer is used as the material of the outer layer coating 36 . As the elastomer, an ether-based thermoplastic polyurethane elastomer is preferable from the viewpoint of high friction, abrasion resistance, and hydrolysis resistance. In addition, the outer layer coating 36 may contain a flame retardant. Thereby, the outer layer coating 36 can be made flame-retardant.

Other configurations in the third embodiment are the same as those in the second modification.

In such a main rope 7, the plurality of steel strands 22 do not come into direct contact with the drive sheave 5, so wear and damage of the plurality of steel strands 22 can be suppressed.

An outer layer coating 36 may be provided on the main rope 7 of the first embodiment shown in FIG.

Also, an outer layer coating 36 may be provided on the main rope 7 of the first modification shown in FIG.

Further, an outer layer coating 36 may be provided on the main rope 7 of the second embodiment shown in FIG.

Embodiment 4.
Next, FIG. 8 is a sectional view of the main rope 7 according to Embodiment 4, showing a section perpendicular to the length direction of the main rope 7. As shown in FIG. In the main rope 7 of Embodiment 4, the core rope 21 in the second modified example shown in FIG. Also, the outer circumference of the core wire 21 is covered with a core wire coating 35 .

Other configurations in the fourth embodiment are the same as those in the second modification.

In this way, the core 21 may be composed of a large number of core strands 23, and the same effect as in the first embodiment can be obtained.

An outer layer coating 36 may be provided on the main rope 7 of the fourth embodiment.

Also, the core cord coating 35 of the fourth embodiment may be omitted.

Embodiment 5.
Next, FIG. 9 is a sectional view of the belt according to Embodiment 5, showing a section perpendicular to the longitudinal direction of the belt. In FIG. 9 the belt 41 can be used in place of the main rope 7 of the elevator shown in FIG. The belt 41 also has a plurality of ropes 42 and a rope covering 43 .

The plurality of ropes 42 are arranged at regular intervals in the width direction of the belt 41 . The width direction of the belt 41 is the horizontal direction in FIG. In Embodiment 5, four ropes 42 are used.

The structure of each rope 42 is the same as that of the main rope 7 of Embodiment 1 shown in FIG. The multiple ropes 42 function as strength members.

A rope covering 43 covers the entire group of all ropes 42 . That is, the multiple ropes 42 are integrated by the rope covering 43 .

Elastomer is used as the material of the rope covering 43 . As the elastomer, an ether-based thermoplastic polyurethane elastomer is preferable from the viewpoint of high friction, abrasion resistance, and hydrolysis resistance. In addition, the rope covering 43 may contain a flame retardant. Thereby, the rope covering 43 can be made flame-retardant.

In such a belt 41 as well, deterioration in strength of the core rope 21 of each rope 42 over time can be suppressed. As a result, the strength of the belt 41 as a whole can be suppressed from being lowered over a long period of time.

The number of ropes 42 included in the belt 41 is not particularly limited, and may be 3 or less or 5 or more.

4, the second modification shown in FIG. 5, the second embodiment shown in FIG. 6, and the embodiment shown in FIG. It may be similar to Embodiment 3 or Embodiment 4 shown in FIG.

Moreover, the belt 41 may include a plurality of types of ropes 42 that differ from each other in at least one of configuration and diameter.

The belt 41 may also include a rope that does not include the sheath-core structure fiber filaments 30 . That is, at least one of the plurality of ropes 42 included in the belt 41 should include the core-sheath structure fiber filament 30 .

Further, in the first to fifth embodiments, the layout of the entire elevator is not limited to the layout shown in FIG. For example, the roping scheme may be a 2:1 roping scheme.

Further, the elevator may be a machine room-less elevator, a double-deck elevator, a one-shaft multi-car elevator, or the like. The one-shaft multi-car system is a system in which an upper car and a lower car placed directly below the upper car independently ascend and descend a common hoistway.

The ropes may also be elevator ropes other than the main ropes 7, such as compen ropes or governor ropes. The belt may also be, for example, a compen belt used in place of a compen rope, or a governor belt used in place of a governor rope.

Moreover, the rope is not limited to an elevator rope, and may be a rope used for other purposes, such as a crane rope used in a lifting device. The belt may also be, for example, a crane belt used in a lifting device.

7 main rope, 21 cord, 22 steel strand, 30 core-sheath structure fiber filament, 31 filament core, 32 sheath, 41 belt, 42 rope, 43 rope covering.

Claims (4)

a core cord, and a plurality of steel strands twisted around the circumference of the core cord;
The core has core strands,
The core strand is configured by twisting a plurality of yarns,
each said yarn is an assembly of a plurality of fiber filaments,
All or part of the plurality of fiber filaments are core-sheath structure fiber filaments ,
The core-sheath structure fiber filament has a filament core and a sheath covering the outer circumference of the filament core,
The filament core is composed of a first material,
The sheath body is made of a second material different from the first material,
The modulus of elasticity of the first material is higher than the modulus of elasticity of the second material,
The rope , wherein the abrasion resistance of the second material is higher than the abrasion resistance of the first material . 2. The rope according to claim 1 , wherein said first material is polyarylate resin. 3. The rope according to claim 1 , wherein said second material is a polyester resin. a plurality of ropes spaced from one another and a rope jacket covering the plurality of ropes;
A belt in which at least one of the plurality of ropes is the rope according to any one of claims 1 to 3 .

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