WO2019180783A1

WO2019180783A1 - Elevator rope

Info

Publication number: WO2019180783A1
Application number: PCT/JP2018/010808
Authority: WO
Inventors: 晋也内藤; 肥田　政彦; 史也村田; 道雄村井
Original assignee: 三菱電機株式会社
Priority date: 2018-03-19
Filing date: 2018-03-19
Publication date: 2019-09-26
Also published as: JP6414370B1; DE112018007311T5; KR20200119295A; KR102486074B1; CN111867960B; CN111867960A; JPWO2019180783A1

Abstract

When a bend in an elevator rope is loosened, some core materials may remain displaced. Further application of a load on these materials in the tensile direction may not be smooth. The present invention is characterized by being provided with: a rope core (2) that is configured by a plurality of core materials being integrated without being twisted; and strands that are arranged on the outer periphery of the rope core.

Description

Elevator rope

This invention relates to an elevator rope.

The structure of an elevator rope is generally such that a rope core is disposed at the center of the elevator rope, and steel strands, which are a plurality of steel strands, are twisted around the outer periphery of the rope core. Rope cores are made of various materials such as steel and fibers, and are formed by twisting the core material. When the rope core is a fiber, the core material is a fiber bundle. This fiber bundle is generally made by twisting general fibers such as hemp or synthetic fibers.

The elevator rope is loaded with the weight of the car, the weight of the counterweight, and the weight of the elevator rope itself. In a high-rise building, the lift distance of the car is long, so the length of the elevator rope used is also long. As the length of the elevator rope becomes longer, the influence of the weight of the elevator rope itself becomes larger, so the maximum lifting distance of the car is limited by the strength of the rope and the weight of the rope. That is, in order to increase the lifting distance of the car, a light and high strength rope having a higher mass specific strength (strength / weight per unit length) is required. As a means for obtaining a light and high-strength rope, there is a case in which a tensile load is shared by a rope core made of a lightweight synthetic fiber.

Also, the elevator rope is generally used with a load that is 10% or less of the breaking strength of the elevator rope. At this time, the elongation of the elevator rope in the tensile direction is less than 1%. Therefore, it is important for elevator ropes to generate higher loads during small elongations, such as less than 1% elongation.

Since the steel strand of the elevator rope is made of steel, the elevator rope can generate a high load even during a small elongation such as an elongation of less than 1% in the tensile direction of the elevator rope. However, when the rope core is made of fiber, the twisted fiber is likely to be stretched and contracted by the amount of twist, so it is difficult to generate a high load while the rope core is stretched as small as less than 1%. .

When considering the strength of the entire elevator rope, it is important to load the rope core. In other words, it is important that the rope core generates a higher load during a small elongation such as less than 1% in the tensile direction. Therefore, in order to further reduce the twist of the rope core of the elevator rope, it is conceivable to bundle the fiber bundle of the core material without twisting to form the rope core. Cited Document 1 discloses that a large number of fiber yarns are bundled in parallel as a core material.

Japanese Patent Publication No. 10-140490

When the rope core is bundled without twisting the core material, when the elevator rope is bent, the core materials may be shifted due to a difference in curvature between the inside and outside of the bend. When the bending of the elevator rope in this state is loosened, the deviation of some core materials may not return. When a load is applied again to the core material in which the deviation has not returned, the core material is less likely to be loaded. Since the shifted core material cannot bear the load, the other core material is excessively loaded. As a result, there exists a problem that the intensity | strength as the whole elevator rope will fall.

In order to solve the above problems, the present invention is characterized by comprising a rope core integrated without twisting a plurality of core members, and a strand disposed on the outer periphery of the rope core.

According to the present invention, in an elevator rope having a rope core having a core material that is not twisted, there is an effect that it is possible to suppress a decrease in strength due to the bending back of the elevator rope.

It is sectional drawing of an elevator rope with a rope core formed by bundling fiber bundles. It is a figure of a rope core formed by bundling fiber bundles. It is a figure of the fiber bundle which comprises the rope core formed by bundling the fiber bundle. It is a conceptual diagram of the relationship between elongation and load when a synthetic fiber rope is pulled. It is a figure showing an example of the relationship between elongation and load when the fiber rope from which a twist shrinkage differs is pulled. 1 is a sectional view of an elevator rope according to a first embodiment. FIG. 3 is a diagram illustrating a rope core according to the first embodiment. It is sectional drawing of the elevator rope of Embodiment 2. It is a figure which shows the rope core of Embodiment 2. FIG. It is a figure which shows the fiber bundle which comprises the rope core of Embodiment 2. FIG. It is sectional drawing of the elevator rope of Embodiment 3. It is a figure showing the performance value of the measured elevator rope of each elevator rope from which conditions differ. It is a figure which shows an example at the time of an elevator rope being attached to the elevator.

Hereinafter, an elevator rope according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
First, the structure of the elevator rope 1 having the rope core 2 formed by bundling a plurality of fiber bundles 4 that are core materials without twisting them will be described. After that, the strength of the elevator rope 1 having the rope core 2 formed by bundling the fiber bundle 4 without twisting will be described, and the features of the present invention will be described.

FIG. 1 is a cross-sectional view of an elevator rope 1 having a rope core 2 formed by bundling fiber bundles 4 as core materials. The elevator rope 1 according to the first embodiment has a plurality of steel strands 3 (eight in this example) made of stranded wires arranged on the outer periphery of the rope core 2 and twisted together. The elevator rope 1 has a structure in which eight steel strands 3 are wound around a rope core 2, for example, 8 × S (19), 8 × W (19), or 8 × Fi defined in JIS G3525. This is the structure of (25). Although the elevator rope 1 of this Embodiment is made from the steel strand 3, what is necessary is just a strand, and a material is not limited.

FIG. 2 is a view showing a rope core 2 in which fiber bundles 4 are bundled. FIG. 2 includes a cross-sectional view and a perspective view of the rope core 2. The rope core 2 has a configuration in which a plurality of (7 in this example) fiber bundles 4 that are core materials are bundled without being twisted. The fiber bundle 4 as the core material is made of synthetic fiber. As shown in FIG. 2, the rope core 2 formed by bundling a plurality of pieces means a single rope core 2 formed by superposing a plurality of fiber bundles 4 approximately in parallel. In other words, the rope core 2 is configured by collecting a plurality of fiber bundles 4 so as to be approximately parallel.

In the present embodiment, the core material is a synthetic fiber, but it may be a general fiber, and the material of the core material is not limited. The core material may be anything as long as it is fibrous. Since each fiber is too thin in a general elevator rope, a plurality of fibers are twisted to form a fiber bundle 4, and the rope core 2 is often generated therefrom.

FIG. 3 is a view showing a fiber bundle 4 constituting the rope core 2. It is the figure which looked at the fiber bundle 4 from diagonally. FIG. 3 is an enlarged view of one of the seven fiber bundles 4 in FIG. 2. The fiber bundle 4 is obtained by twisting hundreds to tens of thousands of synthetic fibers having an outer diameter of several μm to several tens of μm.

Here, the configuration in which a plurality of core materials are bundled without being twisted does not have to be bundled without twisting all the core materials in the fiber bundle 4 that is a twisted core material. For example, nine of the ten core materials are twisted together, but only one is not twisted. In addition, two sets of 10 core members are twisted to form 5 sets, and the 5 sets may be arranged in parallel. “Not twisting the core material” is not limited to the state in which all the core materials are not twisted in this way, but also includes a case where a part of the core material is not twisted, and is not limited.

Further, the configuration in which a plurality of core materials are bundled without being twisted is a concept including the case where the core materials themselves are not twisted. For example, the case where the core material is formed without twisting the fibers of the core material and the core materials are twisted, the case where the core material is not twisted, and the core materials are not twisted is also conceivable. That all the core members are bundled without being twisted means a state in which each fiber bundle 4 is arranged substantially parallel to the longitudinal direction.

The fiber material constituting the fiber bundle 4 is preferably composed of fibers having high tensile strength and tensile modulus. It is preferable that the fiber has a tensile strength of 20 cN / dtex or more and a tensile modulus of 500 cN / dtex or more. Specifically, one or more of para-type aramid fiber, meta-type aramid fiber, carbon fiber, polyarylate fiber, and polyparaphenylene benzoxazole fiber are used. Next, in order to explain the strength of the elevator rope 1 having the rope core 2 in which the fiber bundle 4 is not twisted but bundled, the strength of a general elevator rope will be explained first.

As mentioned above, in general, in order to increase the strength of the elevator rope, the rope core needs to generate a larger load with a smaller strain such as a strain of less than 1%. For that purpose, it is important to reduce the structural elongation described later. In order to increase the strength of the elevator rope, it is also important that all the fibers are pulled evenly so that the load is not biased to a specific fiber bundle of the rope core. In other words, it is important to increase the strength utilization rate. Here, the strength utilization rate means a value represented by actual strength / theoretical strength × 100, where the strength of the fiber bundle used × the number of the fiber bundles used is the theoretical strength.

Moreover, the mass specific strength of the entire elevator rope can be increased by making the rope core lighter and stronger. Although it is conceivable that the material of the rope core is made of steel, the strength tends to increase, but the mass increases. Therefore, the rope core 2 is light like a fiber and preferably has a higher strength. In this embodiment, since a synthetic fiber is assumed as a rope core, the strength of a general synthetic fiber rope will be described. The synthetic fiber rope described here refers to a synthetic fiber rope that is twisted.

FIG. 4 is a diagram showing a conceptual diagram of the relationship between elongation and load when a general synthetic fiber rope is pulled. As shown in FIG. 4, the elongation of the synthetic fiber rope can be divided into structural elongation and material elongation. Structural elongation occurs at the beginning of the process of pulling the synthetic fiber rope. The twisted fibers that make up the synthetic fiber rope are pulled in a state where they are not in close contact with each other. This occurs in the process where the fibers come into close contact with each other while tightening toward the center of the rope. For this reason, while the structural elongation occurs, the influence of the material of the fiber does not appear and a load is hardly generated.

When the tension continues to grow and the fiber becomes sufficiently close, the material becomes stretched. The material elongation is caused by the elongation of the fibers constituting the synthetic fiber rope, and the load begins to increase. In other words, by reducing the structural elongation, the synthetic fiber rope generates a high load with a smaller elongation.

In order to reduce the structural elongation, it is necessary to reduce the elongation due to twisting, so it is necessary to reduce the twist reduction ratio of the fiber. Here, the twist reduction ratio is expressed by a value of (Lb−La) / Lb, where La is the length of the twisted fiber and Lb is the length of the fiber untwisted from the length of La. The

FIG. 5 is a view showing an example of the relationship between elongation and load when pulling synthetic fiber ropes having different twist shrinkage rates. In general, elevator ropes are used with an elongation in the tensile direction of less than 1%, so it is important to generate a large load with an elongation of less than 1%. According to FIG. 5, it can be seen that when the twist reduction ratio is 15%, the load at an elongation of 1% is high, and the load at an elongation of 1% or less is high at a twist reduction ratio of 15% or less. Conversely, when the twist reduction ratio is higher than 15%, the load at an elongation of 1% or less decreases.

From this, when considering that the load of the elevator rope is shared by the rope core of the synthetic fiber rope, it is required that the load is increased when the elongation is 1% or less, and therefore it can be said that the twist reduction rate is preferably 15% or less. . In this embodiment, since each fiber bundle is twisted, when the length of each fiber bundle 4 is Ly, and the length of the fiber obtained by untwisting the fiber bundle 4 of Ly length is Lf, (Lf−Ly) / Lf is the twist reduction ratio of the fiber bundle 4. When the length of the rope core 2 in which the fiber bundle 4 is bundled without being twisted is Lc, the values of Lc and Ly are the same value, so the value of (Lf−Lc) / Lf is (Lf−Ly) ) / Lf and the same value.

That is, when the rope core 2 is formed by bundling the fiber bundle 4 without twisting, and the fiber bundle 4 that is a plurality of core members is a twisted core material, the twist reduction ratio of each fiber bundle 4 is It can be equated with the twist reduction ratio of the entire rope core 2. Since the rope core 2 formed by bundling the fiber bundle 4 having a twist reduction ratio of 15% or less without being twisted can be regarded as the above-described synthetic fiber rope having a twist reduction ratio of 15% or less, the twist reduction ratio of the fiber bundle 4 By setting the ratio to 15% or less, an elevator rope with higher strength can be obtained. Moreover, since the load of an elevator rope can be shared with the lighter rope core 2 like a synthetic fiber, the mass ratio intensity | strength of an elevator rope will be raised.

The twist shrinkage of the fiber bundle 4 is more preferably 10% or less. When twisted at a twist reduction ratio (Lf−Ly) / Lf higher than 15%, the structural elongation becomes large, and the load applied to the elevator rope 1 can hardly be shared by the rope core 2.

Also, as described above, in order to increase the strength of the elevator rope 1, it is also important that the strength utilization rate is increased. In other words, it is ideal that the twist reduction rate is the same for all the fiber bundles 4. Thereby, all the fiber bundles 4 can be pulled uniformly, and the strength utilization rate can be increased. Therefore, when the fiber bundles 4 are bundled without being twisted, the twist reduction rate of each fiber bundle 4 is 15% or less, and the strength of the entire elevator rope 1 can be further increased by making the fiber bundles 4 equal. . In general, it is known that when fibers are twisted together, the strength of the fibers becomes weaker than that of the original fibers. The strength can be increased by not twisting together.

The elevator rope 1 formed by combining the rope core 2 having the above-described configuration and the steel strand 3 has 8 × S (19) and 8 × W (19) having a conventional three-ply synthetic fiber rope as a rope core. ) Or 8 × Fi (25) rope, the breaking load is high. The mass specific strength (kN / kg / m) obtained by dividing the breaking load (kN) of the elevator rope by the mass per unit length (kg / m) is 160 kN / kg / m or more, preferably 180 kN / kg / m or more. is there. Next, features of the present invention will be described. The present invention has the following features.

FIG. 6 is a cross-sectional view of the elevator rope 5 according to the first embodiment. The elevator rope 5 of Embodiment 1 shows a state in which the fiber bundle 4 is fixed and integrated with a resin 9. As shown in FIG. 6, the fiber bundles 4 that are a plurality of core materials are integrated with each other through a resin 9. The elevator rope 5 has a plurality (eight in this example) of steel strands 3 made of stranded wires arranged on the outer periphery of a rope core 6 integrated with a resin 9 and twisted together.

FIG. 7 shows the rope core 6 of the first embodiment. FIG. 7 shows a rope core 6 in which fiber bundles 4 of an elevator rope 1 having a rope core 2 formed by bundling the fiber bundles 4 that are the core materials described in FIGS. FIG. 7 includes a cross-sectional view and a side view of the rope core 6. It differs from the elevator rope 1 in that it is fixed and integrated by the resin 9 of the fiber bundle 4. Here, the integration means that the relative position in the longitudinal direction between adjacent fiber bundles 4 does not change irreversibly. As long as the relative positions of the fiber bundles 4 do not change irreversibly, the fiber bundles 4 are not necessarily fixed and integrated by the resin 9, and the way of integration is not limited. In the case of integration through the resin 9, it is preferable that the resin enters between the fiber bundles 4 and the fiber bundles 4 are integrated through the resin 9, but the present invention is not limited to this.

When the fiber bundle 4 is integrated with the resin 9, when the elevator rope 5 is bent on the sheave, the relative position in the longitudinal direction between adjacent fiber bundles 4 temporarily changes reversibly. At this time, the temporary change in the relative position in the longitudinal direction between adjacent fiber bundles 4 is due to elastic deformation of the resin 9. Therefore, when the elevator rope passes through the sheave and returns to the linear shape from the state where the elevator rope is bent, the resin 9 recovers from the elastic deformation state, and the relative position in the longitudinal direction of the fiber bundles 4 passes through the sheave. Return to the same position as before.

Further, the type of the resin 9 is not limited, but for example, a flexible resin having high wear resistance such as a thermoplastic resin is preferable. Specifically, it is selected from polyethylene, polypropylene, and polyurethane, but not limited thereto. The resin 9 covers the outer periphery of the fiber bundle 4, thereby preventing direct contact between the steel strand 3 and the fiber bundle 4 and suppressing the damage of the fiber bundle 4 during use of the elevator rope 5.

The present invention integrates the fiber bundle 4 that is a core material that is bundled without twisting, so that when the elevator rope 5 is bent and the bending returns, the fiber bundles 4 that are the core material are displaced from each other. Can be suppressed. If the fiber bundle 4 is displaced, the load on some of the fiber bundles 4 may be biased due to the displacement. Since each fiber bundle 4 cannot receive the load evenly distributed, the strength when viewed as a whole of the elevator rope is lowered.

By integrating the fiber bundle 4 that is the core material, even in a mechanism in which the fiber bundles 4 are bundled, a decrease in the strength of the elevator rope 5 due to the deviation between the fiber bundles 4 due to the bending back of the elevator rope 5 can be suppressed. effective. Moreover, since the rope core 6 can be formed in a state where the fiber bundle 4 as the core material is bundled without being twisted by the mechanism of the present invention, a high load is borne by the rope core 6 and the strength of the entire elevator rope is increased. Can give. Moreover, since the rope core 6 is a synthetic fiber, the mass specific strength can be further increased.

Since a large load can be borne by the rope core 6, the ratio of the cross-sectional area of the steel strand 3 to the cross-sectional area of the elevator rope 5 can be reduced, thereby further reducing the weight of the entire elevator rope 5 and The mass specific strength can be improved. Moreover, it becomes easy to pull each fiber bundle 4 equally by integrating adjacent fiber bundles 4 mutually. As a result, the strength utilization factor of the rope core 6 formed by bundling the fiber bundle 4 can be increased, and the strength of the elevator rope can be further increased.

Embodiment 2. FIG.
In the present embodiment, the outer periphery of each of the fiber bundles 4 as the core material is covered with the core material coating material 8 as the resin, and the coated core material 12 covered with the core material coating material 8 is bundled. This is different from the first embodiment in that the rope core 11 is integrated. Even in this embodiment, the material of the core material is not limited. This embodiment will be described using a fiber bundle 4 as a core material.

FIG. 8 is a sectional view of the elevator rope 10 according to the second embodiment. Similarly to the first embodiment, the elevator rope 10 according to the second embodiment includes a plurality of (8 in this example) steel strands 3 made of twisted wires arranged on the outer periphery of the rope core 11 and twisted together. have. The rope core 11 is covered with a rope core covering material 7. Each of the fiber bundles 4, which are a plurality of core materials, is coated with the resin of the core material coating material 8 to form a coated core material 12. As shown in FIG. 8, the coated core members 12 are integrated with each other through a resin.

.
FIG. 9 is a view showing the rope core 11 of the second embodiment. FIG. 9 includes a cross-sectional view and a side view of the rope core 11. In FIG. 9, the rope core covering material 7 is not shown. In the present embodiment, the outer periphery of the rope core 11 in which the coated core material 12 is bundled and integrated is covered with the rope core coating material 7 that is a resin. However, the present invention is not limited to this. There may be no coating surrounding 11 and it is not limited.

The rope core covering material 7 has a role of preventing direct contact between the steel strand 3 and the fiber bundle 4 and suppressing damage of the fiber bundle 4 during use of the elevator rope 10. The rope core covering material 7 is preferably a twisted or knitted synthetic fiber or a resin formed by extrusion.

In the case of a synthetic fiber, a synthetic fiber having high wear resistance is preferable, and is selected from, for example, para-type aramid fiber, meta-type aramid fiber, polyarylate fiber, and polyester fiber, but is not limited thereto.

The resin for forming the rope core covering material 7 by extrusion molding is preferably a flexible resin having high wear resistance and is selected from, for example, polyethylene, polypropylene, and polyurethane, but is not limited thereto. However, a resin molded at a temperature lower than the melting point of the resin used in the fiber bundle 4 is preferable. This is because when the resin molded at a temperature higher than the melting point of the resin used in the fiber bundle 4 is used, the fiber bundle 4 may be melted and damaged by heat during molding. As the extrusion molding method, a method similar to the method of coating a linear object such as an electric wire with a resin can be applied.

The covering of the rope core may be a double or more structure. For example, the outer periphery of the rope core 11 formed by bundling the fiber bundle 4 may be knitted and covered with synthetic fiber, and the outer periphery may be further covered with a resin by extrusion molding. The rope core covering material 7 can prevent direct contact between the fibers of the rope core 11 and the steel strands 3, and can suppress damage to the fibers of the rope core 11 during use of the elevator rope.

FIG. 10 is a view showing a coated core material 12 constituting the rope core 11 of the second embodiment. FIG. 10 includes a cross-sectional view and a side view of the coated core material 12. Each of the coated core materials 12 is coated. The rope core 11 is integrated by bundling the coated core material 12. Here, the term “integrated” refers not only to the case where the core material covering materials 8 are fixed and integrated, but also the case where the core material covering materials 8 are integrated by friction between the core material covering materials 8 being bundled. included. The definition of integration is as described in the first embodiment.

The core material covering material 8 can be applied by a method similar to the method of covering a linear object such as an electric wire with a thermoplastic resin by extrusion molding. The resin used for the core material covering material 8 has high wear resistance and is preferably a flexible resin, and is selected from, for example, polyethylene, polypropylene, and polyurethane, but is not limited thereto. However, a resin molded at a temperature lower than the melting point of the resin used for the coated core material 12 is preferable. This is because, when using a resin that is molded at a temperature higher than the melting point of the resin used for the coated core material 12, the fiber bundle 4 may be melted and damaged by heat during molding.

In this embodiment, the covering core material 12 coated with resin is integrated by bundling, but the way of integration is not limited. For example, as described above, the coated core materials 12 may not be fixed to each other and may be integrated by frictional force, or the core material coating materials 8 may be fixed to be integrated. The core material covering material 8 is preferably made of a material having a high frictional force. When the core material covering material 8 is made of a thermoplastic resin, it can be integrated with higher frictional force.

As a method of fixing the coated core materials 12, the coated core materials 12 may be integrated by, for example, thermally fusing the resins of the core material coated material 8 of the coated core material 12. The coated core material 12 is heated to the melting point of the core coating material 8 or higher than the melting point and lower than the melting point of the fiber bundle 4, and the core coating material 8 of the plurality of coated core materials 12 is heat-sealed. There is a way to integrate. If the core material covering material 8 is a thermoplastic resin, it is suitable for easy thermal fusion. Accordingly, the core material covering material 8 between the coated core materials 12 can be fixed without using an adhesive or the like.

Further, the resins of the core material covering material 8 of the coated core material 12 may be integrated by bonding with an adhesive. As a method of bonding the core material coating materials 8 of the coated core material 12, the core material coating materials 8 of the plurality of coated core materials 12 are in close contact with each other with the adhesive applied to the outer periphery of the core material coating material 8. There is a method of integrating them. In the present embodiment, as a method of fixing, heat fusion and adhesion using an adhesive have been described. However, the method is not limited to this method, and the method of fixing is not limited. As another fixing method, for example, pressure may be applied to the coated core members 12 by applying pressure to each other.

In the present embodiment, parts different from the first embodiment have been described. The other parts are the same as those in the first embodiment. Generally, the more fibers are bundled, the more difficult it is to pull all the fibers evenly. However, the fibers can be pulled evenly by bundling the covering core material 12 together. As a result, the strength utilization factor of the rope core 11 in which the covering core material 12 is bundled and integrated can be increased, and the strength of the elevator rope 10 can be increased. By making the core material into the fiber bundle 4, the mass specific strength can be further increased.

Furthermore, since the core material covering material 8 prevents direct contact between the steel strand 3 and the fiber bundle 4, damage to the fiber bundle 4 can be suppressed. Moreover, by having a rope core coating | cover, the damage of the fiber bundle 4 which generate | occur | produces during use of the elevator rope 10 can be suppressed further, and the lifetime of the elevator rope 10 can be achieved.

Embodiment 3 FIG.
The present embodiment is different from the first and second embodiments in that the number of steel strands 16 disposed on the outer periphery of the rope core 11 is twelve.

FIG. 11 is a sectional view of the elevator rope 15 according to the third embodiment. In FIG. 11, it is a figure at the time of the rope core 11 of Embodiment 2 being applied. The rope core 11 of the second embodiment has a fiber bundle 4 as a core material, and a coated core material 12 in which the fiber bundle 4 is coated with a core material coating material 8. The rope core 11 is coated with the rope core coating material 7. The In this embodiment, the rope core 11 is applied, but the present invention is not limited to this, and any rope core having a higher mass specific strength may be used. The

rope cores

2 and 6 described in the first and second embodiments are also included.

In the elevator rope 15 of the third embodiment, compared to the structure in which the eight steel strands 3 shown in the first and second embodiments are wound, the breaking of the steel strand 16 with respect to the cross-sectional area of the elevator rope 15 is reduced. The area ratio is low, and the weight of the elevator rope is reduced. Specifically, when 8 steel strands 3 are used, the cross-sectional area ratio of the steel strands 3 is 46%, and when 12 steel strands 16 are used, the cross-sectional area ratio is 36%. is there.

Note that the sectional area of the elevator rope 15 is calculated from the nominal diameter of the elevator rope 15. In the present embodiment, the parts different from the first and second embodiments have been described. The other parts are the same as in the first and second embodiments.

In this way, the diameter of the rope core 11 can be increased even with an elevator rope having the same diameter as the ratio of the cross-sectional area of the steel strand 16 is reduced, and the shared load of the rope core 11 can be increased. . As a result, the weight of the elevator rope 15 can be reduced without reducing the strength, and the mass specific strength of the elevator rope 15 can be further improved.

In addition, although the example which used 12 steel strands 16 was shown in Embodiment 3, the ratio of the cross-sectional area of steel strands is further reduced using 13 or more steel strands, and the rope core 11 is used. It is also possible to further increase the diameter of the elevator rope 15 and further reduce the weight of the elevator rope 15.

The configurations of the first to third embodiments can be applied to elevator ropes having any outer diameter. Further, the outer diameter of the rope core is appropriately set with respect to the outer diameter of the elevator rope. Further, the number of bundles of fiber bundles and the number of fibers included in the fiber bundles are also appropriately set according to the set outer diameter of the rope core. Furthermore, the wire configuration of each steel strand is not particularly limited.

Furthermore, the steel of the present invention can be applied not only to the main rope that suspends the car and the suspension weight but also to the compen- sion rope that is suspended from the cage and the suspension weight. Next, effects related to the first to third embodiments will be described based on comparison of measurement results of different types of elevator ropes.

FIG. 12 is a diagram showing performance values for each type of elevator rope measured for each of the elevator ropes having different conditions. Here, the performance value means mass per unit length (kg / m), load at 0.5% elongation (kN), breaking load (kN), mass specific strength (kN / kg / m), bending fatigue test The post-high residual rate (%). First, the ropes 1 to 4 of the rope type shown in FIG. 12, the fiber core rope, and the steel core rope will be described in detail.

The rope 1 is a rope that is twisted using 28 polyoctylate fibers Vectran HT (manufactured by Kuraray Co., Ltd.) 1670 dtex (configuration of 300 fibers) to form a fiber bundle. The strand shrinkage (Lf−Ly) / Lf of this fiber bundle is 9%. Seven prepared fiber bundles were arranged in the longitudinal direction without twisting to prepare a rope core having an outer diameter of about 7 mm.

8 Steel strands were wound around the outer periphery of the rope core in a state where a load of 50 kgf was applied to the rope core, and an 8 × S (19) elevator rope having an outer diameter of 12 mm was produced as the rope 1. In this way, the rope 1 is an elevator rope that bundles fiber bundles without twisting to form a rope core.

The rope 2 is a rope that is twisted by using 21 strands of polyarylate fiber Vectran HT (manufactured by Kuraray) 1670 dtex (configuration of 300 fibers) to form a fiber bundle. The strand shrinkage (Lf−Ly) / Lf of this fiber bundle is 9%. Seven prepared fiber bundles were arranged in the longitudinal direction without twisting, and the outer periphery was covered with polyethylene resin Novatec HB530 (manufactured by Nippon Polyethylene Co., Ltd.) by extrusion to produce a rope core having an outer diameter of about 7 mm.

8 Steel strands were wound around the outer periphery of the rope core in a state where a load of 50 kgf was applied to the rope core, and an 8 × S (19) elevator rope having an outer diameter of 12 mm was produced as the rope 2. In this way, the rope 2 is an elevator rope in which fiber bundles are bundled without twisting to form a rope core, and the rope core is further covered with a resin.

The rope 3 is a rope formed by twisting 21 pieces of polyarylate fiber Vectran HT (manufactured by Kuraray Co., Ltd.) 1670 dtex (configuration of 300 fibers) into a fiber bundle. The strand shrinkage (Lf−Ly) / Lf of this fiber bundle is 9%. The outer periphery of the produced fiber bundle was covered with polyethylene resin Novatec HB530 (manufactured by Nippon Polyethylene Co., Ltd.) by extrusion molding. Seven coated fiber bundles were arranged in the longitudinal direction without twisting, and after pressure-contacting at 150 ° C., cooling was performed to produce a rope core having an outer diameter of about 7 mm.

8 Steel strands were wound around the outer periphery of the rope core in a state where a load of 50 kgf was applied to the rope core, and an 8 × S (19) elevator rope having an outer diameter of 12 mm was produced as the rope 3. In this way, the rope 3 is an elevator rope that covers and bundles each of the fiber bundles to form an integrated rope core.

The rope 4 is a rope that is twisted by using 28 poly acrylate fiber Vectran HT (manufactured by Kuraray Co., Ltd.) 1670 dtex (configuration of 300 fibers) to form a fiber bundle. The strand shrinkage (Lf−Ly) / Lf of this fiber bundle is 9%. The outer periphery of the produced fiber bundle was covered with polyethylene resin Novatec HB530 (manufactured by Nippon Polyethylene Co., Ltd.) by extrusion molding. Seven coated fiber bundles were arranged in the longitudinal direction without twisting, and after pressure-contacting at 150 ° C., cooling was performed to produce a rope core having an outer diameter of about 8 mm.

12 steel strands were wound around the outer periphery of the rope core with a load of 50 kgf applied to the rope core, and a 12 × S (19) elevator rope having an outer diameter of 12 mm was produced as the rope 4. In this way, the rope 4 increases the number of strands of the rope core integrated by covering and bundling each of the fiber bundles, increasing the number of the strands to 12 and reducing the total cross-sectional area of the steel strands. If the diameters are the same, there is room for increasing the outer diameter of the rope core, so the elevator rope has an outer diameter increased from 7 mm to 8 mm.

The fiber core rope is an 8 × S (19) elevator rope with an outer diameter of 12 mm, using a three-strand hemp fiber rope as the rope core, and 8 steel strands wrapped around a rope core with an outer diameter of about 7 mm. is there. This elevator rope is generally used.

The steel core rope is a general elevator with an 8xS (19) rope core with an outer diameter of 12 mm, wrapped with 8 steel strands of IWRC (Independent Wire Rope Core), whose rope core is a steel core. It is a rope.

Compare the measured values of each performance value for ropes 1 to 4, fiber core rope, and steel core rope. The fiber core rope is a general conventional elevator rope, and the steel core rope is a general IWRC rope. It can be seen that the ropes 1 to 4 of the present invention have higher mass specific strength than these.

When comparing the fiber core rope and the ropes 1 to 3, the ropes 1 to 4 are stretched 0.55 despite the same outer diameter of the rope core, the number of steel strands, and the outer diameter of the elevator rope. % Load is high. As a result, it can be seen that the rope core formed by bundling the fiber bundle without twisting like the ropes 1 to 3 can share the load at the beginning of the elongation of the elevator rope, that is, the elongation is 0.5%.

When comparing rope 1 and rope 2, rope 1 has a higher breaking load. This is because the rope 2 has the same outer diameter of the rope core as the rope 1 and the amount of polyarylate fibers in the fiber bundle is reduced from 28 to 21 in the rope 1 in order to provide the rope core coating. Presumed to be due. On the other hand, the residual strength rate after the bending fatigue test is higher in the rope 2. This is presumably because the fiber core damage can be suppressed in the bending fatigue test by providing the rope core coating.

When comparing rope 2 and rope 3, rope 3 has a higher breaking load. The difference between the rope 2 and the rope 3 is whether the outer periphery of the rope core is covered with a resin or whether each fiber bundle is covered with a resin and integrated. It can be seen that the breaking load increases when each of the fiber bundles is coated and integrated with a resin.

This is presumably because all the fiber bundles are evenly pulled by coating each of the fiber bundles with a resin, and the strength utilization rate of the fibers contained in the rope core can be increased. The fact that all fiber bundles can be pulled evenly is also assumed that there is no deviation between the fiber bundles. Further, the difference in weight between the rope 2 and the rope 3 is not large, and therefore the mass specific strength is greatly increased.

比較 When rope 3 and rope 4 are compared, rope 3 has a higher breaking load. This is presumably because the total cross-sectional area of the eight steel strands of the rope 3 is larger than the total cross-sectional area of the twelve steel strands of the rope 4.

Since the mass per unit length is lighter as the total cross-sectional area of the steel strand is smaller, the mass specific strength is higher in the rope 4 than in the rope 3. The outer diameter of the rope core of the rope 4 is larger, and the cross-sectional area of the rope core of the rope 4 is larger than the cross-sectional area of the rope core of the rope 3, but the rope core is made of light synthetic fiber. The rope 4 has a higher mass specific strength.

It can be seen that it is effective to reduce the cross-sectional area of the steel strand and make the rope core thicker when it is desired to increase the mass specific strength even if the breaking load is slightly reduced with the same outer diameter of the elevator rope.

FIG. 13 is a diagram showing an example when the elevator rope 5 of the present invention is attached to an elevator. In FIG. 13, the elevator rope 5 is connected to a general elevator cage 17. The elevator rope 5 is pulled through the sheave 18 when the elevator rod 17 moves up and down. When the elevator rope passes through the sheep 18, the elevator rope 5 is bent, and after passing, the bending returns.

FIG. 13 is an example, and the way the elevator rope 5 is connected is not limited. The method of connecting the elevator rope 5 is not limited as long as it is directly and indirectly connected to the kite 17 and can be raised and lowered. Although the elevator rope 5 according to the first embodiment is illustrated in FIG. 13, the elevator rope 5 is not limited thereto, and may be the

elevator ropes

10 and 15 described in the second and third embodiments.

1, 5, 10, 15: Elevator rope, 2, 6, 11: Rope core, 3, 12, 16: Steel strand, 4: Fiber bundle, 9: Resin, 8: Core material covering material, 12: Coated core Material

Claims

A rope core integrated without twisting a plurality of cores;
A strand disposed on the outer periphery of the rope core;
An elevator rope characterized by comprising:
The elevator rope according to claim 1, wherein each of the plurality of core members is integrated with the rope core via a resin.
The elevator according to claim 1, wherein each of the plurality of core materials is coated with a resin to form a coated core material, and the coated core materials are integrated with each other via the resin. rope.
The elevator rope according to claim 3, wherein the resin of the coated core material is bonded and integrated with the rope core.
The elevator rope according to claim 3, wherein the rope core is integrated by heat-sealing the resins of the coated core material.
The elevator rope according to any one of claims 1 to 5, wherein each of the plurality of core members is a twisted core member.
The strand is a steel strand made of steel,
The elevator rope according to claim 6, wherein a twist reduction ratio of the rope core is 15% or less.
The strand is a steel strand made of steel,
The elevator rope according to claim 6, wherein each of the plurality of core members has a twist reduction ratio equal to or less than 15%.