Rope and belt using same

Abstract

In this rope, a fiber core (21) has a first layer (31) and a second layer (32) disposed on the outer periphery of the first layer (31). The first layer (31) has at least one first fiber core strand (33). The second layer (32) has a plurality of second fiber core strands (34). Each of the first fiber core strands (33) is configured by reinforcing a first twisted thread made of synthetic fiber with a first resin. Each of the second fiber core strands (34) is configured by reinforcing a second twisted thread made of synthetic fiber with a second resin. The elastic modulus of the first resin is higher than that of the second resin.

Description

Technical Field

[0001] The present disclosure relates to a rope and a belt using the rope. Background Art

[0002] In a conventional hybrid rope, a plurality of side strands are twisted around the outer periphery of a high-strength synthetic fiber core. The high-strength synthetic fiber core has a high-strength synthetic fiber rope. The high-strength synthetic fiber rope has a plurality of high-strength synthetic fiber bundles. Each high-strength synthetic fiber bundle is composed of a plurality of high-strength synthetic fiber filaments. The diameter of each high-strength synthetic fiber filament is several μm to several tens of μm. (For example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent No. 5478718 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the conventional rope as described above, a plurality of high-strength synthetic fiber bundles are twisted to manufacture a high-strength synthetic fiber core. At this time, the cross-sectional shape of the high-strength synthetic fiber core is circular. In addition, in order for the high-strength synthetic fiber core to sufficiently bear the tensile load, a plurality of high-strength synthetic fiber bundles are loosely twisted.

[0008] However, since each high-strength synthetic fiber bundle is thin and soft, if a plurality of high-strength synthetic fiber bundles are loosely twisted, the cross-sectional shape of the high-strength synthetic fiber core is likely to be deformed, and the cross-sectional shape of the high-strength synthetic fiber core is sometimes not circular but elliptical. In this case, the cross-sectional shape of the rope also becomes elliptical, and the life of the rope may be reduced.

[0009] On the other hand, for example, there is also known a technique of reinforcing a twisted yarn obtained by twisting high-strength fiber yarns with resin like a fiber-reinforced plastic. However, if only the twisted yarn is reinforced with resin, it is difficult to change the cross-sectional shape of the twisted yarn. Therefore, in the case where the structure of the high-strength synthetic fiber core as described above is a structure in which a plurality of twisted yarns are arranged in multiple layers, voids are likely to be generated between the twisted yarns, and the filling amount of the high-strength synthetic fiber cannot be sufficiently increased, and the tensile load may not be sufficiently borne.

[0010] The present disclosure has been made to solve the above-described problems, and an object thereof is to obtain a rope that can sufficiently ensure the filling amount of synthetic fibers in a fiber core and stabilize the cross-sectional shape of the fiber core, and a belt using the rope.

[0011] Means for Solving the Problems

[0012] The rope of the present disclosure includes: a fiber core; and a plurality of steel strands disposed on the outer periphery of the fiber core. The fiber core has a first layer and a second layer disposed on the outer periphery of the first layer. The first layer has at least one first fiber core strand, and the second layer has a plurality of second fiber core strands. Each first fiber core strand is formed by reinforcing a first twisted yarn made of synthetic fiber with a first resin, and each second fiber core strand is formed by reinforcing a second twisted yarn made of synthetic fiber with a second resin. The elastic modulus of the first resin is higher than that of the second resin.

[0013] Advantages of the Invention

[0014] According to the present disclosure, it is possible to sufficiently ensure the filling amount of synthetic fiber in the fiber core and stabilize the cross-sectional shape of the fiber core. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view showing an elevator according to Embodiment 1.

[0016] Figure 2 is Figure 1 a cross-sectional view of the main rope.

[0017] Figure 3 It is a cross-sectional view of the main rope according to Embodiment 2.

[0018] Figure 4 It is a cross-sectional view of the main rope according to Embodiment 3.

[0019] Figure 5 It is a cross-sectional view of the main rope according to Embodiment 4.

[0020] Figure 6 It is a cross-sectional view of the main rope according to Embodiment 5.

[0021] Figure 7 It is a cross-sectional view of the main rope according to Embodiment 6.

[0022] Figure 8 It is a cross-sectional view of the belt according to Embodiment 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Hereinafter, the embodiments will be described with reference to the drawings.

[0024] Embodiment 1.

[0025] Figure 1 It is a side view showing an elevator according to Embodiment 1. In Figure 1 it, a machine room 2 is provided above a hoistway 1. A traction machine 3 and a deflector pulley 6 are provided in the machine room 2.

[0026] The traction machine 3 has a traction machine main body 4 and a drive sheave 5. The traction machine main body 4 has a traction machine motor (not shown) and a traction machine brake (not shown). The traction machine motor rotates the drive sheave 5. The traction machine brake maintains the drive sheave 5 in a stationary state. In addition, the traction machine brake brakes the rotation of the drive sheave 5.

[0027] A plurality of main ropes 7 are wound around the drive sheave 5 and the deflector sheave 6. The plurality of main ropes 7 are elevator ropes respectively.

[0028] The car 8 and the counterweight 9 are suspended in the hoistway 1 by a plurality of main ropes 7. In addition, the car 8 and the counterweight 9 move up and down in the hoistway 1 by rotating the drive sheave 5.

[0029] A pair of car guide rails 10 and a pair of counterweight guide rails 11 are provided in the hoistway 1. In Figure 1 only one side of the car guide rail 10 and one side of the counterweight guide rail 11 are shown.

[0030] A pair of car guide rails 10 guide the up and down movement of the car 8. A pair of counterweight guide rails 11 guide the up and down movement of the counterweight 9.

[0031] The car 8 has a car frame 12 and a car cabin 13. A plurality of main ropes 7 are connected to the car frame 12. The car cabin 13 is supported by the car frame 12.

[0032] Figure 2 is Figure 1 A cross-sectional view of the main rope 7 shows a cross-section perpendicular to the length direction of the main rope 7. The main rope 7 of Embodiment 1 is a rope of 8×S(19) type according to JIS G 3525.

[0033] The main rope 7 has a fiber core 21 and a plurality of steel strands 22. In this example, eight steel strands 22 are arranged on the outer periphery of the fiber core 21. In addition, the eight steel strands 22 are twisted on the outer periphery of the fiber core 21.

[0034] The fiber core 21 is arranged at the center of the cross-section of the main rope 7 perpendicular to the length direction. In addition, the fiber core 21 has a first layer 31 and a second layer 32. The first layer 31 in Embodiment 1 is composed of one first fiber core strand 33.

[0035] The first fiber core strand 33 is arranged at the center of the fiber core 21 in the cross-section of the fiber core 21 perpendicular to the length direction. The shape of the first fiber core strand 33 in the cross-section of the fiber core 21 perpendicular to the length direction is circular.

[0036] The second layer 32 is disposed on the outer periphery of the first layer 31. The second layer 32 has a plurality of second fiber core strands 34. In Embodiment 1, eight second fiber core strands 34 are twisted around the outer periphery of the first fiber core strand 33. Thus, the structure of the fiber core 21 is a double-twist structure.

[0037] The first fiber core strand 33 is formed by reinforcing a first twisted yarn made of synthetic fiber with a first resin. Each second fiber core strand 34 is formed by reinforcing a second twisted yarn made of synthetic fiber with a second resin. The elastic modulus of the first resin is higher than that of the second resin.

[0038] The first twisted yarn and the second twisted yarn are each formed by single-twisting a plurality of yarns. At least a part of the plurality of yarns constituting the first twisted yarn and the second twisted yarn is a high-strength synthetic fiber yarn. The high-strength synthetic fiber yarn in Embodiment 1 is a synthetic fiber yarn having a tensile strength of 20 cN / dtex or more and a tensile elastic modulus of 500 cN / dtex or more. In Embodiment 1, all the yarns constituting the first twisted yarn and the second twisted yarn are the above-mentioned high-strength synthetic fiber yarns.

[0039] Each steel strand 22 has a plurality of steel single wires. The plurality of steel single wires include a center single wire 24, a plurality of intermediate single wires 25, and a plurality of outer single wires 26.

[0040] The center single wire 24 is disposed at the center of the cross section of the steel strand 22 perpendicular to the length direction. The plurality of intermediate single wires 25 are twisted around the outer periphery of the center single wire 24. In this example, nine intermediate single wires 25 are used.

[0041] The plurality of outer single wires 26 are twisted around the outer periphery of the intermediate layer formed by the plurality of intermediate single wires 25. In this example, nine outer single wires 26 are used. That is, in each steel strand 22, the number of intermediate single wires 25 is the same as the number of outer single wires 26.

[0042] The diameter of each outer single wire 26 is smaller than the diameter of the center single wire 24. The diameter of each intermediate single wire 25 is smaller than the diameter of each outer single wire 26.

[0043] In addition, when the loads of the car 8 and the counterweight 9 actually act on the main rope 7, each steel strand 22 is pressed against the outer periphery of the fiber core 21.

[0044] In such a main rope 7, the first fiber core strand 33 is formed by reinforcing a first twisted yarn made of synthetic fiber with a first resin. In addition, each second fiber core strand 34 is formed by reinforcing a second twisted yarn made of synthetic fiber with a second resin.

[0045] Moreover, the elastic modulus of the first resin is higher than that of the second resin. That is, the first fiber core strand 33 is more difficult to deform than each second fiber core strand 34.

[0046] Therefore, it is possible to stabilize the cross-sectional shape of the fiber core and make the cross-sectional shape of the entire main rope 7 close to a perfect circle. Thereby, it is possible to suppress a reduction in the life of the main rope 7.

[0047] In addition, each second fiber core strand 34 is more easily deformed than the first fiber core strand 33. Therefore, each second fiber core strand 34 can be deformed to a certain extent along the outer periphery of the first fiber core strand 33, and it is difficult to generate a gap between each second fiber core strand 34 and the first fiber core strand 33 even in the double-layer structure fiber core 21. In addition, it is also difficult to generate a gap between adjacent second fiber core strands 34.

[0048] Therefore, it is possible to sufficiently ensure the filling amount of the synthetic fiber in the fiber core 21, and the fiber core 21 can sufficiently bear the tensile load.

[0049] In this way, according to the main rope 7 of Embodiment 1, it is possible to sufficiently ensure the filling amount of the synthetic fiber in the fiber core 21 and stabilize the cross-sectional shape of the fiber core 21.

[0050] In addition, since the structure of the fiber core 21 is a double-layer twisted structure, the first fiber core strand 33 and each second fiber core strand 34 can be twisted loosely compared with a three-strand structure fiber core. Thereby, the fiber core 21 can bear the tensile load more sufficiently.

[0051] In addition, the first layer 31 is composed of one first fiber core strand 33. Therefore, the structure of the first layer 31 can be simplified, and the first layer 31 can be easily manufactured.

[0052] In addition, at least a part of the plurality of yarns constituting the first twisted yarn and the second twisted yarn is a high-strength synthetic fiber yarn. Therefore, a lightweight and high-strength main rope 7 can be obtained, and the main rope 7 can be easily applied to a high-lift elevator.

[0053] Embodiment 2.

[0054] Next, Figure 3 is a cross-sectional view of the main rope 7 of Embodiment 2, showing a cross-section perpendicular to the length direction of the main rope 7.

[0055] The first layer 31 in Embodiment 2 is formed by twisting three first fiber core strands 33. That is, the first layer 31 in Embodiment 2 is a three-strand rope. The cross-sectional shape of the three-strand rope in the cross-section of the fiber core 21 perpendicular to the length direction is circular.

[0056] Other structures of Embodiment 2 are the same as those of Embodiment 1.

[0057] In such a main rope 7, a three-strand rope is used as the first layer 31. Therefore, it is possible to increase the diameter of the first layer 31 and the diameter of the fiber core 21. As a result, it is also possible to increase the diameter of the entire main rope 7.

[0058] In addition, in the case of manufacturing the three-strand rope in Embodiment 2, it is preferable to reinforce the three first twisted yarns with a first resin after twisting the three first twisted yarns together. In the case where each first twisted yarn is reinforced with the first resin and then the three first twisted yarns are twisted together, the cross-sectional shape of each first twisted yarn is difficult to deform, there are more voids in the three-strand rope, and the filling amount of the synthetic fiber decreases by an amount corresponding to the voids.

[0059] Embodiment 3.

[0060] Next, Figure 4 is a cross-sectional view of the main rope 7 of Embodiment 3, showing a cross-section of the main rope 7 perpendicular to the length direction.

[0061] The main rope 7 of Embodiment 3 further includes a resin fiber core covering 35 in addition to the fiber core 21 and the plurality of steel strands 22. The fiber core covering 35 covers the outer periphery of the fiber core 21. The plurality of steel strands 22 are arranged on the outer periphery of the fiber core 21 with the fiber core covering 35 interposed therebetween. That is, the fiber core covering 35 is interposed between the fiber core 21 and the plurality of steel strands 22.

[0062] As the material of the fiber core covering 35, resin or rubber can be used. Specifically, as the material of the fiber core covering 35, for example, polyethylene, polypropylene, polyvinyl chloride, polyamide, or polyurethane elastomer can be used.

[0063] In addition, the fiber core covering 35 is provided on the outer periphery of the fiber core 21 through the same manufacturing process as the process of providing a covering on a cable. That is, the fiber core covering 35 is provided on the outer periphery of the fiber core 21 by extrusion coating molding in which the fiber core 21 passes through the center.

[0064] Other structures of Embodiment 3 are the same as those of Embodiment 1.

[0065] In such a main rope 7, the fiber core covering 35 is interposed between the fiber core 21 and the plurality of steel strands 22. Therefore, it is possible to suppress wear and damage of the fiber core 21 and to achieve a longer life of the main rope 7.

[0066] In addition, a fiber core covering 35 may be provided on the outer periphery of the fiber core 21 in Embodiment 1.

[0067] Embodiment 4.

[0068] Next, Figure 5It is a cross-sectional view of the main rope 7 of Embodiment 4, showing a cross-section of the main rope 7 perpendicular to the longitudinal direction.

[0069] In Embodiment 4, by compressing each steel strand 22 from the radially outer side, the cross-sectional shape of each outer single wire 26 perpendicular to the longitudinal direction of each steel strand 22 is made non-circular. As a result, the cross-sectional shape of each steel strand 22 perpendicular to the longitudinal direction becomes circular.

[0070] Other configurations of Embodiment 4 are the same as those of Embodiment 3.

[0071] With the main rope 7 of Embodiment 4 configured in this way, the same effects as those of Embodiment 3 can also be obtained.

[0072] In addition, each steel strand 22 in Embodiments 1 to 3 can also be the same steel strand 22 as that in Embodiment 4.

[0073] Embodiment 5.

[0074] Next, Figure 6 It is a cross-sectional view of the main rope 7 of Embodiment 5, showing a cross-section of the main rope 7 perpendicular to the longitudinal direction.

[0075] In Embodiment 5, twelve steel strands 22 are used.

[0076] Other configurations of Embodiment 5 are the same as those of Embodiment 4.

[0077] In such a main rope 7, the cross-sectional area of the fiber core 21 can be made relatively large with respect to the total cross-sectional area of all the steel strands 22. As a result, the main rope 7 can be made further lightweight and high-strength.

[0078] Embodiment 6.

[0079] Next, Figure 7 It is a cross-sectional view of the main rope 7 of Embodiment 6, showing a cross-section of the main rope 7 perpendicular to the longitudinal direction.

[0080] The main rope 7 of Embodiment 6 further includes a resin outer sheath 36 in addition to the fiber core 21, the plurality of steel strands 22, and the fiber core sheath 35. The outer sheath 36 covers the outer periphery of the steel strand layer composed of the plurality of steel strands 22.

[0081] As the material of the outer sheath 36, an elastomer is used. In addition, as the elastomer, an ether-based thermoplastic polyurethane elastomer is preferably used from the viewpoints of high friction, wear resistance, and hydrolysis resistance. Further, the outer sheath 36 may contain a flame retardant. Thereby, the outer sheath 36 can be made difficult to burn.

[0082] Other configurations of Embodiment 6 are the same as those of Embodiment 5.

[0083] In such a main rope 7, a plurality of steel strands 22 do not come into direct contact with the drive sheave 5, so that wear and damage of the plurality of steel strands 22 can be suppressed. In addition, wear and damage of the drive sheave 5 and other pulleys in contact with the main rope 7 can also be suppressed.

[0084] In addition, an outer peripheral covering 36 may be provided on the main rope 7 of Embodiments 1 to 5.

[0085] Embodiment 7.

[0086] Next, Figure 8 is a cross-sectional view of the belt of Embodiment 7, showing a cross-section perpendicular to the length direction of the belt. In Figure 8 it, the belt 41 can be used in place of Figure 1 the main rope 7 of the elevator shown. In addition, the belt 41 has a plurality of ropes 42 and a rope covering 43.

[0087] The plurality of ropes 42 are arranged at equal intervals from each other in the width direction of the belt 41. The width direction of the belt 41 is Figure 8 the left-right direction of. In Embodiment 7, six ropes 42 are used.

[0088] The structure of each rope 42 is the same as that of the main rope 7 of Embodiment 5 shown in Figure 6 The plurality of ropes 42 function as strength members.

[0089] The rope covering 43 covers the entire group composed of all the ropes 42. That is, all the ropes 42 are integrated by the rope covering 43.

[0090] As the material of the rope covering 43, an elastomer is used. In addition, as the elastomer, an ether-based thermoplastic polyurethane elastomer is preferably used from the viewpoints of high friction, wear resistance, and hydrolysis resistance. In addition, the rope covering 43 may contain a flame retardant. Thereby, it is possible to make the rope covering 43 difficult to burn.

[0091] In such a belt 41, the filling amount of the synthetic fiber in the fiber core 21 of each rope 42 is sufficiently ensured, and the cross-sectional shape of each rope 42 is stabilized. Thereby, as the entire belt 41, it is possible to sufficiently bear the tensile load and to achieve a long life.

[0092] In addition, the number of ropes 42 included in the belt 41 is not particularly limited, and may be five or less or seven or more.

[0093] In addition, the structure of each rope 42 included in the belt 41 may also be the same as that of Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 6.

[0094] In addition, the belt 41 may also include a plurality of ropes 42 having different structures and diameters or at least one of them being different.

[0095] In addition, the belt 41 may also include ropes other than those shown in Embodiments 1 to 6.

[0096] In addition, in Embodiments 1 to 7, the structure of each fiber core 21 may also be a multi-layer twisted structure of three or more layers. In this case, if the elastic modulus of the first resin used for the first fiber core strand, which is the first layer of any layer in the multi-layer, is higher than the elastic modulus of the second resin used for the second fiber core strand of the second layer adjacent to the outside of the first layer, the same effect as described above can be obtained.

[0097] In addition, each fiber core strand of the layer disposed on the outermost side of the fiber core 21 may be a three-strand rope.

[0098] In addition, in Embodiments 1 to 7, the number of steel strands 22 disposed on the outer periphery of each fiber core 21 can be appropriately changed and is not limited to eight or twelve.

[0099] In addition, in Embodiments 1 to 7, the overall layout of the elevator is not limited to Figure 1 the layout shown. For example, the rope winding method may also be a 2:1 rope winding method.

[0100] In addition, the elevator may also be a machine-roomless elevator, a double-deck elevator, an elevator in a single hoistway and multi-carriage mode, etc. The single hoistway and multi-carriage mode is a mode in which the upper carriage and the lower carriage disposed directly below the upper carriage move up and down independently in a common hoistway.

[0101] In addition, the rope may also be an elevator rope other than the main rope 7, such as a compensating rope or a governor rope. In addition, the belt may also be, for example, a compensating belt used in place of the compensating rope, or a governor belt used in place of the governor rope.

[0102] In addition, the rope is not limited to elevator ropes and may also be ropes for other uses, such as crane ropes for lifting devices. In addition, the belt may also be, for example, a crane belt for lifting devices.

[0103] Reference Numeral Explanation

[0104] 7: Main rope, 21: Fiber core, 22: Steel strand, 31: First layer, 32: Second layer, 33: First fiber core strand, 34: Second fiber core strand, 35: Fiber core coating, 36: Outer peripheral coating, 41: Belt, 42: Rope, 43: Rope coating.

Claims

1. A rope, comprising: a fiber core; and a plurality of steel strands disposed on the outer periphery of the fiber core, the fiber core having a first layer and a second layer disposed on the outer periphery of the first layer, the first layer having at least one first fiber core strand, the second layer having a plurality of second fiber core strands, each of the first fiber core strands being formed by reinforcing a first twisted yarn made of synthetic fiber with a first resin, each of the second fiber core strands being formed by reinforcing a second twisted yarn made of synthetic fiber with a second resin, the first resin having a higher elastic modulus than the second resin.

2. The rope according to claim 1, wherein the first layer is disposed at the center of the fiber core in a cross-section perpendicular to the length direction of the fiber core and is formed by one of the first fiber core strands.

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

4. The rope according to any one of claims 1 to 3, wherein as at least a part of the plurality of yarns constituting the first twisted yarn and the second twisted yarn, a high-strength synthetic fiber yarn is used, which is a synthetic fiber yarn having a tensile strength of 20 cN / dtex or more and a tensile elastic modulus of 500 cN / dtex or more.

5. The rope according to any one of claims 1 to 4, wherein the rope further comprises a resin fiber core covering covering the outer periphery of the fiber core, the plurality of steel strands being disposed on the outer periphery of the fiber core with the fiber core covering therebetween.

6. The rope according to any one of claims 1 to 5, wherein the rope further comprises a resin outer covering covering the outer periphery of the steel strand layer formed by the plurality of steel strands.

7. A belt, comprising: a plurality of ropes disposed at intervals from each other; and a rope covering covering the plurality of ropes, at least any one of the plurality of ropes being the rope according to any one of claims 1 to 6.

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