JP7279267B2 - Composite strands, methods of manufacture thereof, ropes, belts, and elevators - Google Patents

Description

The present disclosure relates to composite strands, methods of making same, ropes, belts, and elevators.

In conventional elevator ropes, multiple steel strands are twisted around the outer periphery of the rope core. The rope core has a load-bearing portion and a covering portion made of synthetic fiber. The covering portion covers the outer circumference of the load-bearing portion. The load-bearing portion is composed of a fiber assembly. The load-bearing portion is impregnated with a flexible resin and hardened. The load-bearing part has a role of sharing the load and reducing the load applied to the plurality of steel strands when a tensile load is applied to the elevator rope (see Patent Document 1, for example).

International Publication No. 2017/138228

In conventional elevator ropes such as those described above, a plurality of steel strands are arranged around the outer periphery of a fiber rope core. Therefore, repeated bending during use may damage the rope core and reduce the strength of the rope as a whole.

The present disclosure has been made to solve the above problems, and provides a composite strand that can suppress damage to a strand core member due to repeated bending, a method for manufacturing the same, a rope, a belt, and an elevator. With the goal.

The method for producing a composite strand according to the present disclosure includes a first step of forming a core intermediate body by impregnating a high-strength fiber bundle with an uncured matrix resin, and after the first step, a plurality of strands are formed on the outer periphery of the core intermediate body. a second step of twisting the steel peripheral wire members; and a third step of, after the second step, curing the matrix resin to form the core intermediate into a strand core member made of fiber-reinforced plastic.
The composite strand according to the present disclosure includes a strand core member made of fiber-reinforced plastic and a plurality of steel peripheral wire members twisted around the outer periphery of the strand core member. A plurality of grooves are provided, and in a cross section perpendicular to the longitudinal direction of the strand core member, a part of each outer peripheral line member is inserted into the corresponding groove, and the shape of the inner surface of each groove is the same as that of each outer peripheral line. It is a shape along the outer peripheral surface of the member.

According to the present disclosure, damage to the strand core member due to repeated bending can be suppressed.

1 is a perspective view showing an elevator according to Embodiment 1; FIG. 2 is a cross-sectional view of the suspension of FIG. 1; FIG. 3 is an enlarged sectional view showing the composite strand of FIG. 2; FIG. 4 is a cross-sectional view showing only the strand core member of FIG. 3; FIG. FIG. 4 is a cross-sectional view showing an enlarged part of the strand core member of FIG. 3; FIG. 2 is an explanatory diagram showing the first step of the method for manufacturing a composite strand according to Embodiment 1; FIG. 4 is an explanatory diagram showing a second step of the method for manufacturing a composite strand according to Embodiment 1; 4 is an explanatory view showing the third step of the method for manufacturing the composite strand according to Embodiment 1; FIG. It is explanatory drawing which shows the modification of a 3rd process. It is explanatory drawing which shows the modification which a 1st process and a 2nd process are continuously implemented. It is explanatory drawing which shows the modification which a 2nd process and a 3rd process are continuously implemented. It is explanatory drawing which shows the modification which a 1st process, a 2nd process, and a 3rd process are continuously implemented. FIG. 4 is a cross-sectional view of a composite strand according to Embodiment 2; FIG. 14 is a cross-sectional view showing a modification of the composite strand of FIG. 13; FIG. 8 is a cross-sectional view of a suspension body according to Embodiment 3; FIG. 11 is a cross-sectional view of a suspension body according to Embodiment 4; FIG. 11 is a cross-sectional view of a suspension body according to Embodiment 5; FIG. 11 is a cross-sectional view of a suspension according to Embodiment 6; FIG. 11 is a cross-sectional view of a suspension according to Embodiment 7; FIG. 11 is a cross-sectional view of a suspension according to Embodiment 8; FIG. 14 is a cross-sectional view of a suspension according to Embodiment 9; FIG. 20 is a cross-sectional view of a suspension according to Embodiment 10;

Embodiments will be described below with reference to the drawings.
Embodiment 1.
1 is a perspective view showing an elevator according to Embodiment 1. FIG. In the figure, 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 cylindrical drive sheave 5 . The hoist 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 .

The drive sheave 5 rotates about a horizontal axis of rotation. A plurality of suspension bodies 7 are wound around the driving sheave 5 and the deflection wheel 6 . However, only one suspension body 7 is shown in FIG. A plurality of suspension bodies 7 are wound around the outer peripheral surface of the drive sheave 5 at intervals in the axial direction of the drive sheave 5 .

A car 8 is connected to a first longitudinal end of each suspension 7 . A counterweight 9 is connected to a second longitudinal end of each suspension 7 . The car 8 and counterweight 9 are suspended within the hoistway 1 by suspensions 7 . Further, the car 8 and the counterweight 9 move up and down in the hoistway 1 by rotating the drive sheave 5 .

In the hoistway 1, a first car guide rail 10a, a second car guide rail 10b, a first counterweight guide rail (not shown), and a second counterweight guide rail (not shown) are installed. The first car guide rail 10a and the second car guide rail 10b guide the car 8 to move up and down. The first counterweight guide rail and the second counterweight guide rail guide the lifting and lowering of the counterweight 9 .

A compensating body 11 is suspended between the lower part of the car 8 and the lower part of the counterweight 9 . The compensating body 11 compensates for the effects of changes in the weight balance of the suspension 7 due to movement of the car 8 . As the compensating body 11, a flexible string-like member such as a rope or a chain is used.

FIG. 2 is a cross-sectional view of the suspension 7 of FIG. The suspension 7 of Embodiment 1 is a rope. Further, the suspension body 7 of Embodiment 1 is composed only of the rope body 20 . The rope body 20 has a core rope 21 and multiple composite strands 22 as multiple rope strands.

The core rope 21 is configured as a three-strand rope formed by twisting three core rope strands together. Each core strand is configured by bundling a large number of fibers.

A plurality of composite strands 22 are twisted around the outer circumference of the core rope 21 . In the example of FIG. 2, eight composite strands 22 are used.

FIG. 3 is an enlarged cross-sectional view of the composite strand 22 of FIG. 2 and shows a cross section perpendicular to the longitudinal direction of the composite strand 22 . The composite strand 22 has a fiber-reinforced plastic strand core member 23 and a plurality of steel peripheral members 24 . The strand core member 23 is arranged continuously over the entire longitudinal direction of the composite strand 22 .

A plurality of outer peripheral wire members 24 are twisted around the outer periphery of the strand core member 23 . In FIG. 3, 14 outer peripheral members 24 are used. Each outer peripheral member 24 is arranged continuously over the entire longitudinal direction of the composite strand 22 .

A single steel wire, that is, a steel wire is used as each outer peripheral member 24 . The diameter of each outer peripheral member 24 is smaller than the diameter of the strand core member 23 . In a cross section perpendicular to the longitudinal direction of the composite strand 22, each peripheral member 24 has a circular shape.

In a cross section perpendicular to the longitudinal direction of the strand core member 23 , the cross-sectional area of the strand core member 23 is desirably larger than the total cross-sectional area of all the outer peripheral line members 24 . More desirably, the cross-sectional area of the strand core member 23 is 60% or more of the cross-sectional area of the entire composite strand 22 in a cross section perpendicular to the longitudinal direction of the composite strand 22 .

FIG. 4 is a cross-sectional view showing only the strand core member 23 of FIG. 3, with all the outer peripheral wire members 24 removed from FIG. A plurality of grooves 23 a are provided on the outer peripheral surface of the strand core member 23 . The number of grooves 23 a is the same as the number of outer peripheral members 24 .

In a cross section perpendicular to the longitudinal direction of the strand core member 23, a part of each outer peripheral member 24 is inserted into the corresponding groove 23a. In the cross section perpendicular to the longitudinal direction of the strand core member 23 , the shape of the inner surface of each groove 23 a is a shape along the outer peripheral surface of each outer peripheral member 24 .

Therefore, each outer peripheral member 24 is partially fitted in the corresponding groove 23a, as shown in FIG. Each outer peripheral member 24 is in surface contact with the entire inner surface of the corresponding groove 23a.

FIG. 5 is a cross-sectional view showing an enlarged part of the strand core member 23 of FIG. The strand core member 23 has high-strength fiber bundles 25 and matrix resin 26 . The high-strength fiber bundle 25 is configured by bundling a plurality of high-strength fiber filaments 27 . The diameter of each high-strength fiber filament 27 is in the range of several μm to several tens of μm.

At least one material selected from the group consisting of carbon fiber, polyparaphenylenebenzoxazole (PBO) fiber, aramid fiber, polyarylate fiber, polyethylene fiber, glass fiber, and basalt fiber is used as the material of the high-strength fiber filament 27. High strength fibers are used. Moreover, two or more kinds of high-strength fibers may be mixed and used.

A flexible resin is preferably used as the matrix resin 26 in order to secure the flexibility of each composite strand 22 and the flexibility of the suspension 7 as a whole. Epoxy resin or urethane resin is preferably used as the flexible resin. These flexible resins can be easily bent without breaking when subjected to an external force.

The epoxy resin as the matrix resin 26 is a solid obtained by mixing a liquid main agent with a mixture and hardening it. The main agent is selected from the group consisting of epoxy compounds and epoxidized polybutadiene. The molecule of the epoxy compound contains one or more selected from the group consisting of polyoxyalkylene bonds and urethane bonds, and two or more epoxy groups. A molecule of epoxidized polybutadiene contains two or more epoxy groups.

When a urethane resin is used as the matrix resin 26, it is preferable to use an ether-based urethane resin from the viewpoint of hydrolysis resistance. Ether-based urethane resins include those obtained by curing ether-based polyols with various polyisocyanate compounds. Polytetramethylene ether glycol, polypropylene glycol and the like are used as the ether-based polyol.

Adhesion to the high-strength fiber filament 27 can be enhanced by using such an epoxy resin or urethane resin. In addition, sufficient flexibility after curing can be ensured.

Next, a method for manufacturing the composite strand 22 will be described. The manufacturing method of composite strand 22 according to Embodiment 1 includes a first step, a second step, and a third step.

6A and 6B are explanatory views showing the first step of the method for manufacturing the composite strand 22 according to Embodiment 1. FIG. The first step is to form a core intermediate 28 by impregnating a high-strength fiber bundle 25 with an uncured matrix resin 26 .

The high-strength fiber bundle 25 is delivered from the first delivery device 101 and wound up by the first winding device 102 as the core intermediate 28 . An impregnation bath 103 is provided between the first delivery device 101 and the first winding device 102 . The impregnation bath 103 contains an uncured, ie liquid matrix resin 26 . By passing the high-strength fiber bundle 25 through the impregnation bath 103 , the high-strength fiber bundle 25 is impregnated with the liquid matrix resin 26 .

In the first step, a high-strength fiber bundle 25 in which a plurality of high-strength fiber filaments 27 are twisted together is used. In this case, since the cross-sectional shape of the high-strength fiber bundle 25 is less likely to collapse, the cross-sectional shape of the composite strand 22 can also be easily made close to a perfect circle. Moreover, it is possible to obtain the strand core member 23 that is flexible and bendable.

Also, in the first step, a high-strength fiber bundle 25 formed by bundling a plurality of high-strength fiber filaments 27 without being twisted together may be used. In this case, the strength and elastic modulus in the longitudinal direction of the strand core member 23 can be increased.

7A and 7B are explanatory diagrams showing the second step of the method for manufacturing the composite strand 22 according to Embodiment 1. FIG. The second step is performed after the first step. The second step is a step of twisting a plurality of outer peripheral wire members 24 around the outer periphery of the core intermediate 28 .

The core intermediate 28 is delivered from the second delivery device 104 and wound up by the second winder 105 . A twisting device 106 is provided between the second feeder 104 and the second winder 105 . By passing the core intermediate 28 through the twisting device 106 , a plurality of outer peripheral wire members 24 are twisted around the outer periphery of the core intermediate 28 .

The matrix resin 26 in the composite strand 22 wound by the second winder 105 is in an uncured state.

The second step is performed while the core intermediate 28 is under tension. Thereby, the tensile strength of the composite strand 22 can be improved. The tension applied to the core intermediate 28 is preferably 30% or less of the breaking strength of the high-strength fiber bundle 25 . More preferably, the tension applied to the core intermediate 28 is 5% or more and less than 15% of the breaking strength of the high-strength fiber bundle 25 .

8A and 8B are explanatory diagrams showing the third step of the method for manufacturing the composite strand 22 according to Embodiment 1. FIG. The third step is performed after the second step. The third step is a step of forming the core intermediate 28 into the strand core member 23 by curing the matrix resin 26 .

Composite strand 22 containing uncured matrix resin 26 is delivered from third delivery device 107 and passed through heating furnace 108 . The uncured matrix resin 26 is cured by being heated within the heating furnace 108 . The composite strand 22 containing the cured matrix resin 26 is wound by the third winder 109 .

As the heating furnace 108, a high-frequency induction heating furnace is preferably used. That is, the third step preferably includes a high frequency induction heating step. According to the high-frequency induction heating process, the plurality of peripheral wire members 24 can be heated to a high temperature in a short time. Therefore, heat can be transferred to the core intermediate 28 in contact with the plurality of peripheral wire members 24 in a short period of time. Thereby, the manufacturing speed of the composite strand 22 can be increased.

In the composite strand 22, its manufacturing method, the suspension 7, and the elevator, the shape of the inner surface of each groove 23a in the cross section perpendicular to the longitudinal direction of the strand core member 23 is the same as the outer peripheral surface of each outer peripheral member 24. It is a shape that follows. Therefore, each outer peripheral line member 24 is in surface contact with the strand core member 23 rather than in point contact.

Therefore, the contact surface pressure of each outer peripheral line member 24 with respect to the strand core member 23 is reduced, and the strand core member 23 is less likely to be rubbed. Thereby, damage to the strand core member 23 due to repeated bending can be suppressed.

A plurality of outer peripheral wire members 24 are twisted around the outer periphery of the strand core member 23 made of fiber-reinforced plastic. Therefore, the weight of the composite strand 22 can be reduced and the strength can be increased.

Therefore, the suspension 7 of Embodiment 1 can also be applied to an elevator in which the ascending/descending stroke of the car 8 is 75 meters or more. Compared with the conventional elevator rope, the weight saving effect of the suspension 7 of Embodiment 1 increases as the elevator stroke of the car 8 increases.

Further, since the suspension body 7 having a high mass-to-mass strength ratio and a high friction coefficient with respect to the driving sheave 5 can be obtained, the mass of the compensating body 11 can be reduced. For example, the mass of compensating body 11 can be less than half the total weight of all suspension bodies 7 . Also, depending on the lifting stroke of the car 8, the compensating body 11 can be completely removed.

Further, since each strand core member 23 is protected by a plurality of outer peripheral members 24, even if the suspension body 7 is repeatedly bent, the strand core members 23 of the adjacent composite strands 22 do not rub against each other.

Further, abrasion due to repeated bending of the suspension body 7 occurs between the outer peripheral wire members 24 arranged on the outer periphery of each composite strand 22 . Therefore, maintenance of the suspension body 7 can be easily performed by visually confirming the breakage of the outer peripheral member 24 or by detecting it with a dedicated device.

Moreover, in a cross section perpendicular to the longitudinal direction of the strand core member 23 , the cross-sectional area of the strand core member 23 is larger than the total cross-sectional area of all the outer peripheral line members 24 . Therefore, a lightweight and high-strength suspension 7 can be obtained.

Moreover, by selecting the high-strength fibers as described above as the material of the high-strength fiber filaments 27, the composite strand 22 that is lightweight and has high strength can be obtained.

Further, in the method for manufacturing the composite strand 22 of Embodiment 1, the core intermediate 28 is formed by impregnating the high-strength fiber bundle 25 with the uncured matrix resin 26, and the outer periphery of the core intermediate 28 is provided with a plurality of outer peripheries. The wire members 24 are twisted together and the matrix resin 26 is cured. Therefore, the shape of the inner surface of each groove 23 a can be easily made to follow the outer peripheral surface of each outer peripheral member 24 .

In addition, since the high-strength fiber bundle 25 is tightened by the plurality of peripheral wire members 24, the packing density of the fibers can be increased.

In addition, you may implement a 3rd process not only once but twice or more.

Moreover, FIG. 9 is explanatory drawing which shows the modification of a 3rd process. In this example, a heat retaining device 110 is provided downstream of the heating furnace 108 , that is, between the heating furnace 108 and the third winder 109 . The heat retaining device 110 maintains the temperature of the composite strand 22 by heating with hot air. Thus, after the core intermediate 28 is heated to a desired temperature by the high-frequency induction heating process, the temperature may be maintained by heating with hot air.

Also, as shown in FIG. 10, the first step and the second step may be performed continuously.

Also, as shown in FIG. 11, the second step and the third step may be performed continuously.

Moreover, as shown in FIG. 12, the first step, the second step, and the third step may be performed continuously.

Embodiment 2.
Next, FIG. 13 is a cross-sectional view of composite strand 22 according to Embodiment 2, showing a cross section perpendicular to the longitudinal direction of composite strand 22 . In Embodiment 2, a plurality of outer strands 31 are twisted around the outer periphery of the strand core member 23 as a plurality of outer peripheral wire members. Each perimeter strand 31 includes a plurality of steel strands 32 that are twisted together.

In this example, each outer strand 31 is composed of seven wires 32 . The seven strands 32 include a center strand arranged at the center of the outer strand 31 and six outer strands twisted around the center strand. The shape of the inner surface of each groove 23 a is a shape along the outer peripheral surface of each outer strand 31 .

The configuration and manufacturing method of the composite strand 22 are the same as those of the first embodiment, except that a plurality of outer perimeter strands 31 are used. Also, the structure of the suspension body 7 and the structure of the elevator are the same as those of the first embodiment.

Here, when the outer diameter of the composite strand 22 is increased, the outer diameter of each outer peripheral member is also increased. When the outer diameter of the outer peripheral wire member 24 of Embodiment 1 is increased, the flexibility may decrease. On the other hand, the peripheral strand 31 of the second embodiment is less likely to lose its flexibility even if the outer diameter is increased, compared to the peripheral wire member 24 .

Therefore, according to the composite strand 22 of Embodiment 2, the outer diameter of the composite strand 22 can be increased while ensuring flexibility. Thereby, the outer diameter of the suspension body 7 can also be increased.

In addition, as shown in FIG. 14, each outer peripheral strand 31 may be subjected to compression processing from the outer periphery, that is, deformation processing. In FIG. 14, the shape of the cross section perpendicular to the longitudinal direction of each outer strand 31 is deformed into a circular shape. Thereby, the strand core member 23 can be further prevented from being scratched.

In addition, not all the outer strands 31 need to be deformed, and at least one outer strand 31 may be deformed. That is, the outer strands 31 that have been deformed and the outer strands 31 that have not been deformed may be mixed.

Moreover, the outer peripheral wire member 24 of the first embodiment and the outer peripheral strand 31 of the second embodiment may be mixed.

Embodiment 3.
Next, FIG. 15 is a cross-sectional view of suspension 7 according to Embodiment 3, showing a cross section perpendicular to the longitudinal direction of suspension 7 . In Embodiment 3, a composite strand 22 is arranged at the center of the suspension 7 instead of the core rope 21 . Six composite strands 22 are twisted around the composite strand 22 arranged in the center.

The structure of the suspension 7 and the structure of the elevator are the same as those of the first embodiment except that the composite strand 22 is arranged at the center of the suspension 7 . Also, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

In such a suspension 7, since the composite strand 22 is also arranged in the center, the weight of the suspension 7 can be further reduced, and the strength of the suspension 7 can be further increased.

Embodiment 4.
Next, FIG. 16 is a cross-sectional view of suspension 7 according to Embodiment 4, showing a cross section perpendicular to the longitudinal direction of suspension 7 . The rope body 20 of the fourth embodiment has a resin strand covering 33 in addition to the configuration of the rope body 20 of the third embodiment. A strand covering 33 covers the outer circumference of at least one composite strand 22 . In this example, the strand covering 33 covers the outer periphery of the composite strand 22 located at the center of the suspension 7 .

The structure of the suspension 7 and the structure of the elevator are the same as those of the third embodiment except that the strand covering 33 is added. Moreover, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

In such a suspension 7 , the outer periphery of the composite strand 22 arranged at the center of the suspension 7 is covered with a strand covering 33 . Therefore, each outer peripheral member 24 of the composite strand 22 arranged at the center of the suspension 7 is prevented from coming into contact with the outer peripheral members 24 of the other composite strands 22 . As a result, damage to each outer peripheral member 24 is suppressed, and the service life of the suspension 7 can be extended.

As the material of the strand covering 33, polyethylene or polypropylene is preferable from the viewpoint of wear resistance and low friction.

Moreover, the outer peripheries of two or more composite strands 22 may be covered with the strand covering 33 respectively.

Embodiment 5.
Next, FIG. 17 is a cross-sectional view of suspension 7 according to Embodiment 5, showing a cross section perpendicular to the longitudinal direction of suspension 7 . The rope body 20 of Embodiment 5 has a core rope 30 , a resin intermediate covering 34 , and an outer strand layer 35 . The configuration of the core rope 30 is the same as the configuration of the rope body 20 of the fourth embodiment.

The intermediate covering 34 covers the outer circumference of the core rope 30 . The material of the intermediate covering 34 is the same as the material of the strand covering 33 .

An outer strand layer 35 is provided around the outer periphery of the intermediate covering 34 . Also, the outer strand layer 35 is composed of a plurality of composite strands 22 . In FIG. 17, the outer strand layer 35 is made up of twelve composite strands 22 . A plurality of composite strands 22 forming the outer strand layer 35 are each twisted around the outer circumference of the intermediate covering 34 .

In Embodiment 5, all the composite strands 22 included in the rope body 20 have the same cross-sectional configuration. Also, all composite strands 22 included in the rope body 20 have the same outer diameter.

The construction of the suspension 7 and the construction of the elevator are the same as in the fourth embodiment, except that an intermediate covering 34 and an outer strand layer 35 are added. Moreover, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

In such a suspension 7, multiple composite strands 22 are arranged in multiple layers. Therefore, the strength of the suspension 7 can be further increased.

In suspension body 7 of Embodiment 5, two or more types of composite strands 22 having different cross-sectional configurations may be mixed.

Moreover, in the suspension body 7 of Embodiment 5, two or more types of composite strands 22 having different outer diameters may be mixed.

Embodiment 6.
Next, FIG. 18 is a cross-sectional view of suspension 7 according to Embodiment 6, showing a cross section perpendicular to the longitudinal direction of suspension 7 . In the suspension 7 of Embodiment 6, the composite strand 22 at the center of the suspension 7 of Embodiment 4 shown in FIG. 16 is replaced with the composite strand 22 shown in FIG.

The outer diameter of the central composite strand 22 is larger than the outer diameters of the other multiple composite strands 22 .

Except for the configuration of the central composite strand 22, the configuration of the suspension 7 and the configuration of the elevator are the same as in the fourth embodiment. Moreover, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

In such a suspension 7, the outer diameter of the suspension 7 can be increased without increasing the total number of composite strands 22 as compared with the fourth embodiment.

Embodiment 7.
Next, FIG. 19 is a cross-sectional view of suspension 7 according to Embodiment 7, showing a cross section perpendicular to the longitudinal direction of suspension 7 . In the suspension 7 of the seventh embodiment, the multiple composite strands 22 included in the outer strand layer 35 of the fifth embodiment shown in FIG. 17 are replaced with the composite strands 22 shown in FIG. there is

Except for the configuration of the multiple composite strands 22 included in the outer strand layer 35, the configuration of the suspension 7 and the configuration of the elevator are the same as those of the fifth embodiment. Moreover, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

In this way, two or more types of composite strands 22 having different cross-sectional configurations may be used as rope strands, and the degree of freedom in designing the suspension 7 can be improved.

Note that the composite strands 22 shown in FIGS. 3, 13, and 14 may be appropriately mixed in one rope.

Embodiment 8.
Next, FIG. 20 is a cross-sectional view of suspension 7 according to Embodiment 8, showing a cross section perpendicular to the longitudinal direction of suspension 7 . The suspension 7 of the eighth embodiment has a resin outer layer covering 36 in addition to the rope body 20 of the fifth embodiment shown in FIG. The outer layer covering 36 covers the outer circumference of the rope body 20 over the entire longitudinal direction of the rope body 20 .

The outer layer coating 36 is required to have high wear resistance and a high coefficient of friction. Therefore, it is desirable to use a thermoplastic polyurethane elastomer as the material for the outer layer covering 36 . In particular, it is desirable to use an ether-based thermoplastic polyurethane elastomer having high hydrolysis resistance.

In addition, it is desirable that the outer layer coating 36 contain a flame retardant. Thereby, the flame retardancy of the suspension 7 can be ensured.

The structure of the suspension body 7 and the structure of the elevator are the same as those of the fifth embodiment except that the rope body 20 is covered with the outer layer covering 36 . Moreover, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

In such a suspension 7, the outer circumference of the rope body 20 is covered with the outer layer covering 36. As shown in FIG. Therefore, the multiple composite strands 22 included in the outer strand layer 35 are prevented from coming into direct contact with the drive sheave 5 . Thereby, abrasion of the multiple composite strands 22 included in the outer strand layer 35 can be suppressed. Also, the wear of the drive sheave 5 can be suppressed.

Moreover, the friction coefficient of the suspension 7 with respect to the drive sheave 5 can be increased, and the suspension 7 can be applied to the drive sheave 5 having a smaller diameter.

The outer layer covering 36 may be provided on the outer circumference of the rope body 20 shown in the first, third, fourth, sixth, and seventh embodiments and on the outer circumference of the rope body 20 having other cross-sectional configurations.

Further, in Embodiments 1 to 8, each peripheral wire member 24 and each peripheral strand 31 may be plated. Thereby, corrosion of each outer peripheral wire member 24 and each outer peripheral strand 31 can be suppressed.

Further, in Embodiments 1, 3 to 8, all rope strands are composite strands 22 . However, it is sufficient that the composite strand 22 is used as at least one of the plurality of rope strands.

Embodiment 9.
Next, FIG. 21 is a cross-sectional view of suspension 7 according to Embodiment 9, showing a cross section perpendicular to the longitudinal direction of suspension 7 . The suspension 7 of Embodiment 9 is a belt. Further, the suspension body 7 of the ninth embodiment has a plurality of composite strands 22 as a belt wire member and a belt cover 37 made of resin.

Composite strands 22 are arranged in a line spaced apart from each other in the width direction of suspension 7 when viewed in a cross section perpendicular to the longitudinal direction of suspension 7 . As each composite strand 22, the composite strand 22 of Embodiment 2 shown in FIG. 14 is used. Also, in FIG. 21, six composite strands 22 are used.

The belt covering 37 covers the multiple composite strands 22 over the entire length of the suspension 7 . A thermoplastic polyurethane elastomer is preferably used as the material of the belt covering 37 . In particular, it is desirable to use an ether-based thermoplastic polyurethane elastomer having high hydrolysis resistance.

Moreover, the belt covering 37 preferably contains a flame retardant. Thereby, the flame retardancy of the suspension 7 can be ensured.

The structure of the elevator is the same as that of the first embodiment except that the suspension 7 is a belt. Also, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

Such a suspension 7 can be applied to a drive sheave 5 having a smaller diameter while ensuring the same strength as when a rope is used as the suspension 7 .

In the ninth embodiment, all belt wire members are composite strands 22 . However, it is sufficient that the composite strand 22 is used as at least one of the plurality of belt wire members.

Also, two or more types of composite strands 22 different in at least one of the cross-sectional configuration and the outer diameter may be appropriately mixed in one belt. For example, the composite strands 22 shown in FIGS. 3, 13, and 14 may be appropriately mixed in one belt.

Also, the intervals between adjacent composite strands 22 may include three or more different intervals.

Embodiment 10.
Next, FIG. 22 is a cross-sectional view of suspension 7 according to Embodiment 10, showing a cross section perpendicular to the longitudinal direction of suspension 7 . The suspension 7 of Embodiment 10 is a belt. Further, the suspension 7 of Embodiment 10 has a plurality of ropes as belt wire members and a belt covering 37 .

Each rope is composed of the rope body 20 of Embodiment 5 shown in FIG. The plurality of rope bodies 20 are arranged in a line at intervals in the width direction of the suspension 7 when viewed in a cross section perpendicular to the longitudinal direction of the suspension 7 . Also, in FIG. 22, six rope bodies 20 are used.

The belt covering 37 covers the plurality of rope bodies 20 over the entire length of the suspension 7 .

The structure of the elevator is the same as that of the first embodiment except that the suspension 7 is a belt. Also, the manufacturing method of each composite strand 22 is the same as that of the first embodiment.

Such a suspension 7 can be applied to a drive sheave 5 having a smaller diameter while ensuring the same strength as when a rope is used as the suspension 7 .

Moreover, the strength of the suspension 7 can be increased compared to the case where the composite strand 22 is used as each belt wire member.

In the tenth embodiment, all belt wire members are ropes. However, it suffices that a rope including the composite strand 22 is used as at least one of the plurality of belt wire members.

In addition, two or more types of ropes different in at least one of cross-sectional configuration and outer diameter may be appropriately mixed in one belt.

Also, the intervals between adjacent ropes may include three or more different intervals.

Also, the elevator type is not limited to the type shown in FIG. 1, and may be, for example, a 2:1 roping system.

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.

Further, in Embodiments 1 to 10, ropes or belts are used as suspensions 7 for suspending the car 8 . However, the uses of ropes and belts are not limited to this. For example, the ropes and belts can also be applied to elevator governor ropes or compensating bodies. Ropes and belts can also be applied to devices other than elevators, such as crane devices.

3 hoist, 5 drive sheave, 7 suspension (rope, belt), 8 cage, 9 counterweight, 11 compensating body, 20 rope body (belt wire member), 22 composite strand (rope strand, belt wire member), 23 strand core member, 23a groove, 24 outer wire member, 25 high-strength fiber bundle, 26 matrix resin, 27 high-strength fiber filament, 28 core intermediate, 31 outer strand (peripheral wire member), 32 wire, 33 strand covering, 36 outer layer covering, 37 belt covering.

Claims (20)

A first step of forming a core intermediate by impregnating a fiber bundle composed of a plurality of fiber filaments with an uncured matrix resin;
After the first step, a second step of twisting a plurality of steel peripheral wire members around the outer circumference of the core intermediate body; a third step of making the body a strand core member made of fiber reinforced plastic;
At least one fiber selected from the group consisting of carbon fiber, polyparaphenylenebenzoxazole fiber, aramid fiber, polyarylate fiber, polyethylene fiber, glass fiber, and basalt fiber is used as the material of the plurality of fiber filaments. and
In the first step, the matrix resin is introduced between the plurality of fiber filaments,
The third step is a composite strand manufacturing method including a high-frequency induction heating step. 2. The method for producing a composite strand according to claim 1 , wherein the fiber bundle obtained by twisting the plurality of fiber filaments is used in the first step. 2. The method for producing a composite strand according to claim 1 , wherein the first step uses the fiber bundle in which the plurality of fiber filaments are bundled without being twisted together. 4. The method for producing a composite strand according to any one of claims 1 to 3 , wherein the second step is performed while applying tension to the core intermediate. A strand core member made of fiber-reinforced plastic, and a plurality of steel peripheral wire members twisted around the outer periphery of the strand core member,
A plurality of grooves are provided on the outer peripheral surface of the strand core member,
In a cross section perpendicular to the longitudinal direction of the strand core member,
A part of each outer peripheral member is inserted into the corresponding groove,
The shape of the inner surface of each of the grooves is a shape along the outer peripheral surface of each of the outer peripheral line members,
The strand core member includes a plurality of fiber filaments and a matrix resin made of a flexible resin,
At least one fiber selected from the group consisting of carbon fiber, polyparaphenylenebenzoxazole fiber, aramid fiber, polyarylate fiber, polyethylene fiber, glass fiber, and basalt fiber is used as the material of the plurality of fiber filaments. and
The matrix resin enters between the plurality of fiber filaments,
A composite strand in which an epoxy resin or a urethane resin is used as the flexible resin. A strand core member made of fiber-reinforced plastic, and a plurality of steel peripheral wire members twisted around the outer periphery of the strand core member,
A plurality of grooves are provided on the outer peripheral surface of the strand core member,
In a cross section perpendicular to the longitudinal direction of the strand core member,
A part of each outer peripheral member is inserted into the corresponding groove,
The shape of the inner surface of each of the grooves is a shape along the outer peripheral surface of each of the outer peripheral line members,
The strand core member includes a plurality of fiber filaments and a matrix resin made of a flexible resin,
At least one fiber selected from the group consisting of carbon fiber, polyparaphenylenebenzoxazole fiber, aramid fiber, polyarylate fiber, polyethylene fiber, glass fiber, and basalt fiber is used as the material of the plurality of fiber filaments. and
The matrix resin enters between the plurality of fiber filaments,
An epoxy resin is used as the flexible resin,
The epoxy resin is a solid obtained by mixing a liquid main agent with an admixture and curing it,
The main agent is selected from the group consisting of epoxy compounds and epoxidized polybutadiene,
The molecule of the epoxy compound contains one or more selected from the group consisting of polyoxyalkylene bonds and urethane bonds, and two or more epoxy groups,
A composite strand in which the molecule of said epoxidized polybutadiene contains two or more epoxy groups. In a cross section perpendicular to the longitudinal direction of the strand core member,
7. A composite strand according to claim 5 or claim 6 , wherein the cross-sectional area of said strand core member is greater than the sum of the cross-sectional areas of all said perimeter members. At least one of the peripheral wire members is a peripheral strand,
8. The composite strand of any one of claims 5-7 , wherein the perimeter strand comprises a plurality of steel strands that are twisted together. 9. The composite strand of claim 8 , wherein the cross-sectional shape perpendicular to the longitudinal direction of at least one of said perimeter strands is deformed into a circular shape. 10. The composite strand according to any one of claims 5 to 9 , wherein each peripheral member is plated. comprising a rope body having a plurality of rope strands,
A rope using the composite strand according to any one of claims 5 to 10 as at least one of the plurality of rope strands. 12. The rope according to claim 11 , wherein said rope body further comprises a resin strand covering that covers the outer periphery of at least one of said composite strands. 13. The rope according to claim 11 or 12 , wherein two or more types of composite strands having different cross-sectional configurations are used as the rope strands. 14. The rope according to any one of claims 11 to 13 , further comprising a resin outer layer covering covering the outer periphery of the rope body. 15. The rope according to claim 14 , wherein said outer layer coating contains a flame retardant. A plurality of belt wire members arranged at intervals in the width direction when viewed in a cross section perpendicular to the longitudinal direction, and a resin belt covering covering the plurality of belt wire members. ,
A belt using the composite strand according to any one of claims 5 to 10 as at least one of the plurality of belt wire members. A plurality of belt wire members arranged at intervals in the width direction when viewed in a cross section perpendicular to the longitudinal direction, and a resin belt covering covering the plurality of belt wire members. ,
A belt using the rope according to any one of claims 11 to 15 as at least one of the plurality of belt wire members. 18. A belt according to claim 16 or 17 , wherein the belt covering contains a flame retardant. An elevator comprising a rope according to any one of claims 11-15 . An elevator comprising a belt according to any one of claims 16-18 .

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