KR102486074B1 - elevator rope - Google Patents

Abstract

When the bending of the elevator rope is loosened, the displacement of some core materials may not return. When a load is applied again in the tensile direction to the core material from which this displacement has not returned, it becomes difficult to apply the load to the core material. The present invention is characterized by comprising a rope core (2) in which a plurality of core materials are integrated without twisting them, and a strand disposed on the outer periphery of the rope core.

Description

elevator rope

The present invention relates to an elevator rope.

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

The weight of the car, the weight of the counterweight, and the weight of the elevator rope itself are applied to the elevator rope. In a high-rise building, since the lifting distance of the car is also long, the length of the elevator rope used is also long. As the length of the elevator rope increases, the effect of the weight of the elevator rope itself increases, so the maximum lifting distance of the car is limited by the strength and weight of the rope. That is, in order to increase the lifting distance of the car, a lightweight and high-strength rope with a higher mass ratio (strength/weight per unit length) was required. As a means of obtaining a lightweight and high-strength rope, a method of distributing the tensile load to a rope core made of lightweight synthetic fibers may be taken.

In addition, it is common that an elevator rope is 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 becomes important for elevator ropes to generate higher load bearing capacity during small elongations, such as less than 1% elongation.

Since the steel strand of the elevator rope is steel, the elevator rope can generate a high load bearing capacity even during a small elongation, such as less than 1% of the elongation in the tension direction of the elevator rope. However, when the rope core is made of fiber, it is difficult to generate a high load bearing capacity during a small elongation such as less than 1% of the elongation of the rope core, since the twisted fiber is easily stretched as much as the twisted fiber.

In the case of considering increasing the strength of the entire elevator rope, it is important to apply a load to the rope core as well. That is, during a small elongation, such as less than 1% elongation in the tension direction, it becomes important for the rope core to develop a higher load bearing capacity. Then, in order to further reduce the twisting of the rope core of the elevator rope, it is considered to bind the fiber bundles of the core material without twisting them to form a rope core. In Citation Document 1, there is a disclosure about the effect of tying a plurality of fiber yarns in parallel as a core material.

Japanese Unexamined Patent Publication No. Hei 10-140490

When core materials are bundled without twisting to form a rope core, when the elevator rope is bent, the core materials may shift 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 displacement of some of the core materials may not return. When a load is applied again in the tensile direction to the core material from which this displacement has not returned, it becomes difficult to apply the load to the core material. To the extent that the shifted core material cannot bear the load, an excessive load is applied to the other core material. As a result, there is a problem that the strength of the elevator rope as a whole is lowered.

In order to solve the above problems, the present invention is characterized by providing a rope core in which a plurality of core materials are integrated without twisting them, and a strand disposed on the outer circumference of the rope core.

According to the present invention, in an elevator rope having a rope core having an untwisted core material, there is an effect of suppressing a decrease in strength due to bending of the elevator rope.

1 is a cross-sectional view of an elevator rope having a rope core formed by bundling fiber bundles.
Fig. 2 is a view of a rope core formed by bundling fiber bundles.
Fig. 3 is a diagram of fiber bundles constituting a rope core formed by bundling fiber bundles.
Fig. 4 is a conceptual diagram of the relationship between elongation and load bearing capacity when the synthetic fiber rope is stretched.
Fig. 5 is a diagram showing an example of the relationship between elongation and load bearing capacity when fiber ropes having different twist ratios are tensioned.
6 is a sectional view of the elevator rope of Embodiment 1.
Fig. 7 is a diagram showing a rope core of Embodiment 1;
8 is a sectional view of an elevator rope in Embodiment 2.
Fig. 9 is a view showing a rope core of Embodiment 2;
Fig. 10 is a diagram showing fiber bundles constituting the rope core of Embodiment 2;
11 is a sectional view of an elevator rope in Embodiment 3.
12 is a diagram showing performance values of measured elevator ropes for each elevator rope under different conditions.
13 is a diagram showing an example of a case where an elevator rope is attached to an elevator.

EMBODIMENT OF THE INVENTION Below, the elevator rope which concerns on embodiment of this invention is demonstrated in detail based on drawing. In addition, this invention is not limited by this embodiment.

Embodiment 1.

First, the structure of the elevator rope 1 having the rope core 2 formed by bundling a plurality of fiber bundles 4 as core material without twisting will be described. After that, the strength of the elevator rope 1 having the rope core 2 formed by tying the fiber bundles 4 together without twisting them will be described, and the features of the present invention will be explained.

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. Elevator rope 1 of Embodiment 1 has a plurality of (in this example, eight) steel strands 3 composed of twisted wires disposed on the outer periphery of rope core 2 and twisted together. 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× defined in JISG3525 This is the structure of Fi(25). Although the elevator rope 1 of this embodiment is made into the steel strand 3, if it is a strand, any material is not limited.

Fig. 2 is a view showing a rope core 2 formed by bundling fiber bundles 4. Figure 2 consists of a cross-sectional and perspective view of the rope core (2). The rope core 2 has a structure in which a plurality of (in this example, seven) fiber bundles 4 as a core material are bundled without twisting. The core material, the fiber bundle 4, is made of synthetic fibers. The rope core 2 formed by bundling a plurality of fibers means a rope core 2 formed by overlapping a plurality of fiber bundles 4 substantially in parallel, as shown in FIG. 2 . In other words, the rope core 2 is constituted by gathering a plurality of fiber bundles 4 so as to be substantially parallel.

In this embodiment, although the core material is a synthetic fiber, a general fiber may be sufficient, and the material of a core material is not limited. Any core material may be used as long as it is fibrous. In general elevator ropes, since each fiber is too thin, a plurality of fibers are twisted together to form a fiber bundle 4, and the rope core 2 is often produced therefrom.

FIG. 3 is a view showing the fiber bundle 4 constituting the rope core 2. It is a view of the fiber bundle 4 viewed obliquely. It 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 obtained by bundling a plurality of core materials without twisting does not necessarily mean that all of the core materials among the fiber bundles 4, which are twisted core materials, are bundled without twisting. For example, a case where 9 out of 10 core materials are twisted together, but only 1 core material is not twisted together is considered. Moreover, with respect to 10 core materials, the case where 5 sets are comprised by twisting 2 at a time, and these 5 sets are arrange|positioned in parallel is considered. Not twisting the core material is a concept that includes not only the state in which all core materials are not twisted together in this way, but also the case where some core materials are not twisted with each other, and is not limited thereto.

In addition, the configuration formed by bundling a plurality of core materials without twisting is a concept including the case where the core material itself is not twisted. For example, a case where the core material is constituted without twisting the fibers of the core material and the core materials are twisted together, or a case where neither the core material is twisted nor the core materials are twisted is considered. The fact that all the core materials are bundled without twisting refers to a state in which the fiber bundles 4 are arranged substantially parallel to each other in the longitudinal direction.

The fiber material constituting the fiber bundle 4 is preferably composed of fibers having high tensile strength and high tensile elastic modulus. It is preferable that the tensile strength of the fiber is 20 cN/dtex or more and the tensile modulus is 500 cN/dtex or more. Specifically, 1 type or 2 or more types are used from para-aramid fiber, meta-aramid fiber, carbon fiber, polyarylate fiber, and polyparaphenylene benzoxazole fiber. Next, in order to explain the strength of the elevator rope 1 having the rope core 2 in which the fiber bundles 4 are bundled without twisting, first, the strength of a general elevator rope will be described.

As mentioned above, in order to increase the strength of the elevator rope in general, the rope core needs to generate a greater load bearing capacity with a smaller deformation, such as less than 1% deformation. To this end, it is important to reduce the structural elongation described later. In addition, in order to increase the strength of the elevator rope, it is also important that all fibers are evenly tensioned so that the load is not biased to a specific fiber bundle of the rope core. That is, it is also important to increase the strength utilization rate. Here, the strength utilization factor refers to a value represented by actual strength/theoretical strength x 100 when the strength of the fiber bundle being used x the number of fiber bundles being used is the theoretical strength.

Moreover, the mass ratio strength of the whole elevator rope can be raised by making a rope core lighter and stronger. It is also possible to force the material of the rope core, but in that case, the strength tends to increase, but the mass increases. Therefore, it is preferable that the rope core 2 is light as a fiber and has higher strength. Since synthetic fiber is assumed as a rope core in this embodiment, the intensity|strength of a general synthetic fiber rope is demonstrated. The synthetic fiber rope in the description herein refers to a twisted synthetic fiber rope.

4 is a diagram showing a conceptual diagram of the relationship between elongation and load bearing capacity when a general synthetic fiber rope is tensioned. As shown in Figure 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 stretching the synthetic fiber rope, and the twisted fibers constituting the synthetic fiber rope are stretched in a state where they are not in sufficient contact with each other, so that the fibers move toward the center of the synthetic fiber rope. It occurs in the process of the fibers reaching a state of close contact with each other as they are being tightened. For this reason, while the structural elongation occurs, the effect of the material of the fiber does not appear, and the load bearing capacity does not occur in most cases.

When the tension continues and the elongation increases, and the fibers are in a sufficiently close contact state, the material elongation occurs. Material elongation is caused by elongation of the fibers constituting the synthetic fiber rope, and the load bearing capacity begins to increase. That is, by making the structural elongation small, the synthetic fiber rope generates a high load-bearing capacity 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 fiber contraction rate. Here, the twist ratio is represented by a value of (Lb-La)/Lb when the length of the twisted fiber is La and the length of the fiber obtained by twisting the fiber having the length of La is Lb.

Fig. 5 is a diagram showing an example of the relationship between elongation and load bearing capacity when synthetic fiber ropes having different contraction rates are stretched. Generally, elevator ropes are used with an elongation in the tensile direction of less than 1%, so it becomes important to generate a large load bearing capacity at an elongation of less than 1%. According to FIG. 5, it turns out that when the contraction rate reached 15%, the load bearing capacity at an elongation of 1% increased, and the load bearing capacity at an elongation of 1% or less increased at a contraction rate of 15% or less. Conversely, when the contraction ratio is higher than 15%, the load bearing capacity at less than 1% elongation decreases.

From this, when considering sharing the load of the elevator rope to the rope core of the synthetic fiber rope, it is required that the load bearing capacity is increased at an elongation of 1% or less, so it can be said that a twist ratio of 15% or less is preferable. 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 bundle 4 of the length of Ly is Lf, (Lf- Ly)/Lf is the contraction ratio of the fiber bundle 4. When the length of the rope core 2 in which the fiber bundle 4 is not twisted and tied is Lc, the values of Lc and Ly are the same, so the value of (Lf-Lc)/Lf is (Lf-Ly)/Lf is automatically equal to the value of

That is, in the case where the rope core 2 is formed by tying the fiber bundles 4 together without twisting them, and the core material is a core material in which a plurality of fiber bundles 4, which are a plurality of core materials, are twisted, the twist rate of each fiber bundle 4 is calculated as the total length of the rope core 2. It can be simultaneous with the contraction rate of Since the rope core 2 formed by tying the fiber bundles 4 having a shrinkage rate of 15% or less without twisting them together can be the same as the above-mentioned synthetic fiber rope having a shrinkage rate of 15% or less, the shrinkage rate of the fiber bundles 4 By setting the to 15% or less, an elevator rope with higher strength can be obtained. Moreover, since the load of the elevator rope can be shared with the rope core 2 which is lighter like a synthetic fiber, the mass ratio strength of the elevator rope is increased.

As for the shrinkage rate of the fiber bundle 4, 10% or less is more preferable. When twisted with a twist ratio higher than 15% ((Lf-Ly)/Lf), the structural elongation becomes large, and most of the load applied to the elevator rope 1 cannot be shared by the rope core 2.

In addition, as mentioned above, in order to increase the strength of the elevator rope 1, it is also important that the strength utilization rate is increased. That is, it is ideal that this contraction rate is the same in all fiber bundles 4. This makes it possible to uniformly stretch all of the fiber bundles 4, so that the strength utilization rate can be increased. Therefore, when the fiber bundles 4 are bundled without twisting, the strength of the elevator rope 1 as a whole can be further increased by equalizing the shrinkage ratio of each fiber bundle 4 to 15% or less. In addition, it is generally known that when fibers are twisted together, the strength of the original fibers becomes weaker. By not twisting, the strength can be increased.

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

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

Fig. 7 is a diagram showing the rope core 6 of Embodiment 1. 7 is a rope core 6 in which fiber bundles 4 of an elevator rope 1 having a rope core 2 formed by bundling fiber bundles 4 as a core material described in FIGS. 1 and 2 are hardened with resin 9; to be. 7 consists of a sectional view and a side view of the rope core 6. It is different from the elevator rope 1 in that it is fixed and integrated by the resin 9 of the fiber bundle 4. Here, integration means that the relative positions of adjacent fiber bundles 4 in the longitudinal direction do not change irreversibly. As long as the relative positions of the fiber bundles 4 do not change irreversibly, they do not necessarily need to be fixed and integrated by the resin 9, and the method of integration is not limited. In the case of integration via the resin 9, it is preferable that the resin is introduced between the fiber bundles 4 and the fiber bundles 4 are integrated via the resin 9, but is not limited thereto.

When the fiber bundles 4 are integrated with the resin 9, when the elevator rope 5 is bent on a sheave, the relative positions of adjacent fiber bundles 4 in the longitudinal direction are temporarily reversible. It changes. At this time, the temporary change in the relative positions of adjacent fiber bundles 4 in the longitudinal direction is due to elastic deformation of the resin 9. Therefore, when the elevator rope passes through the sheave and the elevator rope returns to a straight shape from the bent state, the resin 9 recovers from the elastically deformed state, and the relative position of the fiber bundles 4 in the longitudinal direction is changed to the sheave. It returns to the same position as before passing through .

In addition, although the kind of resin 9 is not limited, For example, a highly wear-resistant and flexible resin like a thermoplastic resin is preferable. Specifically, it is selected from polyethylene, polypropylene, and polyurethane, but is not limited thereto. The resin 9 prevents direct contact between the steel strands 3 and the fiber bundles 4 by covering up to the outer circumference of the fiber bundles 4, so that the fiber bundles 4 are damaged during use of the elevator rope 5 It also has a deterrent effect.

In the present invention, by integrating the fiber bundles 4, which are core materials that are bundled without twisting, when the elevator rope 5 is bent and then the bending returns, the fiber bundles 4, which are core materials, can be prevented from shifting. If the fiber bundles 4 are shifted, the load on the fiber bundles 4 may be biased due to the shift. Since each fiber bundle 4 cannot evenly distribute and receive the load, then the strength when viewed as the whole elevator rope will decrease.

By integrating the fiber bundles 4 as the core material, even in the structure formed by bundling the fiber bundles 4, the elevator rope 5 due to the deviation between the fiber bundles 4 due to the bending and returning of the elevator rope 5 There is an effect that can suppress the decrease in strength. In addition, since the rope core 6 can be formed in a state in which the fiber bundles 4, which are core materials, are bundled without twisting according to the structure of the present invention, a high load is applied by the rope core 6, thereby increasing the strength of the entire elevator rope. can give In addition, since the rope core 6 is a synthetic fiber, a higher mass ratio strength can be given.

Since the rope core 6 can bear a large load, 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 overall weight of the elevator rope 5 and The improvement of the mass ratio strength can be aimed at. In addition, by integrating adjacent fiber bundles 4 with each other, it is easy to equally pull each fiber bundle 4. As a result, the utilization rate of the strength of the rope core 6 formed by bundling the fiber bundles 4 can be increased, and the strength of the elevator rope can be further increased.

Embodiment 2.

In this embodiment, each outer periphery of the fiber bundle 4 as the core material is covered with the core material covering material 8 which is resin, and the coated core material 12 covered with the core material covering material 8 is bundled, so that the rope core ( 11) is different from Embodiment 1 in that it is integrated. Also in this embodiment, the material of the core material is not limited. This embodiment is explained with the fiber bundle 4 as a core material.

8 is a sectional view of the elevator rope 10 of Embodiment 2. Elevator rope 10 of Embodiment 2, as in Embodiment 1, has a plurality of (in this example, eight) steel strands 3 made of twisted wires disposed on the outer periphery of the rope core 11 and twisted together. there is. The rope core 11 is covered by the 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 covering material 8 to form the coated core material 12. As shown in Fig. 8, the coated core materials 12 are integrated with each other via resin.

Fig. 9 is a diagram showing the rope core 11 of Embodiment 2. 9 consists of a sectional view and a side view of the rope core 11. In FIG. 9, the rope core covering material 7 is not shown. In this embodiment, although the outer periphery of the rope core 11 to which the covering core material 12 is bundled and integrated is covered with the rope core covering material 7 made of resin, it is not limited thereto, and the rope core 11 is surrounded by The covering may be absent and is not limited.

The rope core covering material 7 has a role of preventing direct contact between the steel strands 3 and the fiber bundles 4 and preventing the fiber bundles 4 from being damaged during use of the elevator rope 10 . The rope core covering material 7 is preferably a twisted or woven synthetic fiber or a resin molded by extrusion molding.

In the case of synthetic fibers, synthetic fibers having high abrasion resistance are preferred, and examples thereof include, but are not limited to, para-aramid fibers, meta-aramid fibers, polyarylate fibers, polyester fibers, and the like.

The resin in the case of molding the rope core covering material 7 by extrusion molding is preferably a flexible resin having high abrasion 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 a 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 linear objects such as electric wires with resin can be applied.

The coating of the rope core may have a double or more structure. For example, the outer periphery of the rope core 11 formed by bundling the fiber bundles 4 may be woven and coated with synthetic fibers, and the outer periphery may be further covered with resin by extrusion molding. With the rope core covering material 7, direct contact between the fibers of the rope core 11 and the steel strand 3 can be prevented, and damage to the fibers of the rope core 11 during use of the elevator rope can be suppressed.

Fig. 10 is a diagram showing the coated core material 12 constituting the rope core 11 of the second embodiment. 10 consists of a sectional view and a side view of the covering core material 12. As shown in FIG. As for the covering core material 12, each is covered. In addition, the rope core 11 is integrated by bundling the coated core material 12. Integration here includes not only the case where the core material covering materials 8 are adhered and integrated, but also the case where the core material covering materials 8 are integrated by friction between the core material covering materials 8 by being bundled together. The definition of integration is as described in Embodiment 1.

The core covering material 8 is extruded, and the method similar to the method of covering linear objects, such as an electric wire, with a thermoplastic resin can be applied. The resin used for the core covering material 8 is preferably a resin that has high abrasion resistance and is flexible, 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 covering core material 12 is preferable. This is because when a resin molded at a temperature higher than the melting point of the resin used in the covering core material 12 is used, the fiber bundle 4 may be melted and damaged by heat during molding.

In this embodiment, although the covering core material 12 covered with resin is integrated by bundling, the method of integrating is not limited. For example, as premised, the covering core materials 12 may be integrated by frictional force without adhering to each other, or the core covering materials 8 may be adhered to and integrated. The core covering material 8 is preferably made of a material with high frictional force. By using a thermoplastic resin as the core cover material 8, it can be integrated by giving more frictional force.

As a method of adhering the covering core materials 12 to each other, for example, the covering core materials 12 may be integrated with each other by heat-sealing the resins of the core material covering materials 8 of the covering core material 12 to each other. The core material covering material 12 is heated to the melting point of the core material covering material 8 or above the melting point and below the melting point of the fiber bundle 4, and the core material covering material 8 of the plurality of covered core materials 12 is thermally fused to each other, There is a way to unify it. If the core covering material 8 is a thermoplastic resin, it is easy to heat-seal and is preferable. This makes it possible to fix the core material covering material 8 of the covering core material 12 to each other without using an adhesive or the like.

Alternatively, the resins of the core covering material 8 of the covering core material 12 may be bonded to each other with an adhesive to integrate them. As a method of bonding the core material covering materials 8 of the covering core material 12 to each other, in a state where an adhesive is applied to the outer periphery of the core material covering material 8, the core material covering materials 8 of the plurality of covering core materials 12 are brought into close contact with each other. There is a way to unify it. In the present embodiment, as a method of fixing, thermal fusion and adhesion by an adhesive have been described, but it is not limited to this method, and the method of fixing is not limited. As another bonding method, you may make it crimp by applying pressure to the covering core material 12 mutually, for example.

In addition, in this embodiment, a different part from Embodiment 1 was demonstrated. Other parts are the same as in Embodiment 1. In general, as the number of bundled fibers increases, it becomes difficult to uniformly pull all the fibers. As a result, the strength utilization rate of the rope core 11 in which the coated core material 12 is bundled and integrated can be increased, and the strength of the elevator rope 10 can be increased. By using the core material as the fiber bundle 4, the mass ratio strength can be further increased.

In addition, since the core covering material 8 also prevents direct contact between the steel strands 3 and the fiber bundles 4, damage to the fiber bundles 4 can be suppressed. In addition, by having the rope core coating, damage to the fiber bundle 4 occurring during use of the elevator rope 10 can be further suppressed, and the life span of the elevator rope 10 can be improved.

Embodiment 3.

This embodiment differs from Embodiments 1 and 2 in that the number of steel strands 16 disposed on the outer periphery of the rope core 11 is 12.

11 is a sectional view of the elevator rope 15 of Embodiment 3. In FIG. 11, it is a figure in the case where the rope core 11 of Embodiment 2 is applied. The rope core 11 of Embodiment 2 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 covering material 8, and the rope core 11 is a rope core covering material ( 7) is covered. In this embodiment, although the rope core 11 is applied, it is not limited to this, Any rope core with a higher mass ratio strength may be used. The rope cores 2 and 6 described in Embodiment 1 are also included.

In the elevator rope 15 of Embodiment 3, compared to the structure in which eight steel strands 3 are wound, shown in Embodiments 1 and 2, the cross-sectional area of the steel strand 16 relative to the cross-sectional area of the elevator rope 15 The ratio is low, and the elevator rope is light. Specifically, when using 8 steel strands 3, the ratio of the cross-sectional area of the steel strand 3 is 46%, and when using 12 steel strands 16, the ratio of the cross-sectional area is 36%.

In addition, the cross-sectional area of the elevator rope 15 shall be calculated from the nominal diameter of the elevator rope 15. In addition, in this embodiment, a different part from Embodiment 1 and 2 was demonstrated. Other parts are the same as in Embodiments 1 and 2.

In this way, as the ratio of the cross-sectional area of the steel strands 16 is lowered, the diameter of the rope core 11 can be increased even with an elevator rope of the same diameter, and the load sharing 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 of the elevator rope 15, and the mass ratio strength of the elevator rope 15 can be further improved.

Further, in Embodiment 3, an example using 12 steel strands 16 was shown, but by using 13 or more steel strands, the ratio of the cross-sectional area of the steel strands was further reduced, and the diameter of the rope core 11 was further increased And, it is also possible to further lighten the weight of the elevator rope (15).

In addition, the configurations of Embodiments 1 to 3 can be applied to elevator ropes of all outer diameters. Also, the outer diameter of the rope core is appropriately set with respect to the outer diameter of the elevator rope. Further, along the outer diameter of the rope core to be set, the number of bundled fiber bundles and the number of fibers included in the fiber bundles are appropriately set. In addition, the wire configuration of each steel strand is not particularly limited.

In addition, the steel of the present invention can be applied not only to the main rope for hanging the car and the counterweight, but also to the compensating rope suspended from the car and the counterweight. Next, the effects related to Embodiments 1 to 3 will be described based on comparison of measurement results of elevator ropes of different types.

Fig. 12 is a diagram showing performance values for each rope type of the measured elevator rope of each elevator rope under different conditions. Here, the performance value is mass per unit length (kg/m), load at 0.5% elongation (kN), breaking load (kN), mass ratio strength (kN/kg/m), strength remaining after bending fatigue test (% ) says First, the ropes 1 to 4, the fiber core rope, and the steel core rope of the rope type in Fig. 12 will be described in detail.

Rope 1 is a rope obtained by twisting 28 polyarylate fibers of Vectran HT (manufactured by Kuraray) 1670 dtex (consisting of 300 fibers) into a fiber bundle. The stretching ratio ((Lf-Ly)/Lf) of this fiber bundle was 9%. Seven of the fabricated fiber bundles were arranged in the longitudinal direction without twisting to prepare a rope core having an outer diameter of about 7 mm.

An elevator rope of 8×S (19) with an outer diameter of 12 mm was produced as rope 1 by winding 8 steel strands around the outer circumference of this rope core with a load of 50 kgf applied to the rope core. Rope 1 is an elevator rope made into a rope core by tying together fiber bundles without twisting them in this way.

Rope 2 is a rope obtained by twisting 21 polyarylate fibers of Vectran HT (manufactured by Kuraray) 1670 dtex (consisting of 300 fibers) into a fiber bundle. The stretching ratio ((Lf-Ly)/Lf) of this fiber bundle was 9%. Seven of the produced fiber bundles were arranged in the longitudinal direction without twisting, and the outer periphery was coated with polyethylene resin Novatec HB530 (manufactured by Japan Polyethylene Co., Ltd.) by extrusion molding to prepare a rope core having an outer diameter of about 7 mm.

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

Rope 3 is a rope obtained by twisting 21 polyarylate fibers of Vectran HT (manufactured by Kuraray) 1670 dtex (consisting of 300 fibers) into a fiber bundle. The stretching ratio ((Lf-Ly)/Lf) of this fiber bundle was 9%. The outer periphery of the produced fiber bundle was coated with polyethylene resin Novatec HB530 (manufactured by Japan Polyethylene Co., Ltd.) by extrusion molding. Seven coated fiber bundles were arranged in the longitudinal direction without twisting, pressurized and adhered at 150°C, and then cooled to prepare a rope core having an outer diameter of about 7 mm.

An 8×S (19) elevator rope with an outer diameter of 12 mm was produced as rope 3 by winding 8 steel strands around the outer circumference of this rope core with a load of 50 kgf applied to the rope core. Rope 3 is an elevator rope made of a rope core obtained by coating and bundling each of the fiber bundles as described above.

Rope 4 is a rope obtained by twisting 28 polyarylate fibers of Vectran HT (manufactured by Kuraray) 1670 dtex (consisting of 300 fibers) into a fiber bundle. The stretching ratio ((Lf-Ly)/Lf) of this fiber bundle was 9%. The outer periphery of the produced fiber bundle was coated with polyethylene resin Novatec HB530 (manufactured by Japan Polyethylene Co., Ltd.) by extrusion molding. Seven coated fiber bundles were arranged in the longitudinal direction without twisting, pressurized and adhered at 150°C, and then cooled to prepare a rope core having an outer diameter of about 8 mm.

An elevator rope of 12×S (19) with an outer diameter of 12 mm was produced as rope 4 by winding 12 steel strands around the outer circumference of this rope core with a load of 50 kgf applied to the rope core. In the rope 4, the number of strands of the rope core integrated by coating and bundling each of the fiber bundles is increased to 12 to reduce the cross-sectional area of the total steel strand, and if the outer diameter of the elevator rope is the same, the outer diameter of the rope core is increased Since there is room to do so, the outer diameter of the rope core is 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 in which 3 hemp fiber ropes are used for the rope core and 8 steel strands are wound around a rope core with an outer diameter of about 7 mm. This elevator rope is generally used.

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

The measured values of each performance value for the ropes 1 to 4, the fiber core rope, and the steel core rope are compared. The fiber core rope is a general conventional elevator rope, and the steel core rope is a general IWRC rope. It is found that the ropes 1 to 4 in the present invention have a higher mass ratio strength than these.

In addition, when the fiber core rope and the ropes 1 to 3 are compared, the ropes 1 to 3 have a higher load at 0.5% elongation, even though the outer diameter of the rope core, the number of steel strands, and the outer diameter of the elevator rope are the same. From this, it can be seen that, like the ropes 1 to 3, the rope core side formed by tying the fiber bundles without twisting can further share the load at the initial stage of elongation of the elevator rope, which is 0.5% elongation.

When rope 1 and rope 2 are compared, the breaking load of rope 1 is higher. This is estimated to be due to the fact that the rope 2 has the same outer diameter of the rope core as the rope 1, and the amount of polyarylate fibers used in the fiber bundle is reduced from 28 to 21 in the rope 1 in order to provide a rope core sheath. On the other hand, the strength retention rate after the bending fatigue test is higher for the rope 2. This is presumed to be because fiber damage in the bending fatigue test can be suppressed by providing the rope core coating.

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

This is presumed to be because, by coating each of the fiber bundles with a resin, all the fiber bundles are evenly stretched, and the strength utilization rate of the fibers included in the rope core can be increased. It is also assumed that when all the fiber bundles are equally stretched, no displacement between the fiber bundles occurs. Also, the difference in weight between rope 2 and rope 3 is not large, and therefore, the mass ratio is also greatly increased.

When rope 3 and rope 4 are compared, the breaking load is higher for rope 3. It is estimated that this is because the cross-sectional area of the total of 8 steel strands of rope 3 is larger than the cross-sectional area of the total of 12 steel strands of rope 4.

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

With the outer diameter of the same elevator rope, it can be seen that it is effective to reduce the cross-sectional area of the steel strand and make the rope core thicker if the strength to mass ratio is to be increased even if the breaking load is slightly lowered.

13 is a view showing an example of a case where the elevator rope 5 of the present invention is attached to an elevator. In FIG. 13, the elevator rope 5 is connected to the car 17 of a common elevator. When the elevator car 17 goes up and down, the elevator rope 5 is tensioned through the sheave 18. When the elevator rope passes through the sheave 18, the elevator rope 5 is bent, and after passing through, the bending returns.

13 is an example, and the connection method of the elevator rope 5 is not limited. The connection method of the elevator rope 5 is not limited as long as it is directly or indirectly connected to the car 17 and can move the car 17 up and down. Although it is set as the elevator rope 5 of Embodiment 1 in FIG. 13, it is not limited to this, The elevator ropes 10 and 15 demonstrated by Embodiment 2 and Embodiment 3 may be sufficient.

1, 5, 10, 15: elevator rope 2, 6, 11: rope core
3, 16: forced strand 4: fiber bundle
9: resin 8: core covering material
12: coated core material

Claims (8)

A rope core in which a plurality of fibers are twisted together to form a core material and the plurality of core materials are integrated without twisting each other;
A strand disposed on the outer circumference of the rope core,
The rope core is characterized in that the outer periphery of each of the plurality of core materials is coated with resin to become a coated core material, and the coated core materials are integrated through the resin.
elevator rope. According to claim 1,
Characterized in that the rope core is covered by a rope core covering material
elevator rope. According to claim 1,
The rope core is characterized in that the resins of the coated core material are bonded to each other by an adhesive and integrated.
elevator rope. According to claim 1,
The rope core is characterized in that the resins of the coated core material are thermally fused to each other to be integrated.
elevator rope. According to claim 1,
The strand is a forced strand,
Characterized in that the twist rate of the rope core is 15% or less
elevator rope. According to claim 1,
The strand is a forced strand,
Characterized in that the shrinkage rate of each of the plurality of core materials is 15% or less and is equal
elevator rope. delete delete

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