Elevator arrangement and method for retrofitting an elevator arrangement

Abstract

In an elevator apparatus, a hoisting machine is designed to hoist a car via a plurality of old ropes wound around a drive sheave before being replaced by a plurality of new ropes. The tensile strength of each new rope is higher than that of each old rope. The difference between the unit mass of each new rope and that of each old rope, and the difference between the diameter of each new rope and that of each old rope, are each within a range in which the hoisting machine does not need to be replaced in conjunction with the replacement of the ropes.

Description

Technical Field

[0001] This disclosure relates to elevator devices and their modification methods. Background Technology

[0002] In existing elevator cables, multiple steel side strands are arranged around the outer periphery of the core. Multiple steel auxiliary strands are arranged around the outer periphery of a layer composed of multiple side strands (for example, see Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2014-237908

[0004] In existing elevator cables as described above, multiple auxiliary strands are added to achieve long service life and high strength, resulting in a high steel wire content and increased unit mass. Therefore, if the goal is to replace an existing cable without auxiliary strands with one that does have them, it would also require replacing peripheral equipment such as the traction machine, making it difficult to improve cable performance. Summary of the Invention

[0005] This disclosure was made to solve the problems mentioned above, and its purpose is to obtain an elevator device and a method for modifying the same that can easily improve the performance of cables.

[0006] The elevator device disclosed herein comprises: multiple new cables; a car suspended in a shaft by the multiple new cables; and a traction machine having a drive sheave with the multiple new cables wound around it, thereby raising and lowering the car via the multiple new cables. The traction machine is designed to raise and lower the car via cables wound around the drive sheave before being replaced with the multiple new cables, i.e., multiple old cables. The tensile strength of each new cable is higher than that of each old cable, and the difference between the unit mass of each new cable and the unit mass of each old cable, as well as the difference between the diameter of each new cable and the diameter of each old cable, are within the range that does not require replacement of the traction machine along with the replacement of the cables.

[0007] The elevator modification method disclosed herein includes a rope replacement process of replacing multiple old cables wound around the drive sheave of the traction machine with multiple new cables. The tensile strength of each new cable is higher than that of each old cable. The difference between the unit mass of each new cable and the unit mass of each old cable, as well as the difference between the diameter of each new cable and the diameter of each old cable, are within the range that does not require replacement of the traction machine along with the rope replacement.

[0008] According to this disclosure, the performance of the cable can be easily improved. Attached Figure Description

[0009] Figure 1 This is a simplified structural diagram of the elevator device according to Embodiment 1.

[0010] Figure 2 yes Figure 1 A cross-sectional view of the new cable.

[0011] Figure 3 This is a cross-sectional view of the old cable in Implementation Method 1.

[0012] Figure 4 This is a cross-sectional view showing a first modified example of the new cable according to Embodiment 1.

[0013] Figure 5 This is a cross-sectional view showing a second variation of the new cable according to Embodiment 1.

[0014] Figure 6 This is a cross-sectional view showing a third variation of the new cable according to Embodiment 1.

[0015] Figure 7 This is a cross-sectional view showing a fourth variation of the new cable according to Embodiment 1.

[0016] Figure 8 This is a cross-sectional view showing the fifth variation of the new cable according to Embodiment 1.

[0017] Figure 9 This is a cross-sectional view showing the sixth variation of the new cable according to Embodiment 1. Detailed Implementation

[0018] The embodiments will now be described with reference to the accompanying drawings.

[0019] Implementation Method 1

[0020] Figure 1 This is a simplified structural diagram showing the elevator device according to Embodiment 1. Figure 1 In the hoistway 1, a machine room 2 is installed above the hoistway 1. A traction machine 3 and guide wheels 6 are installed in the machine room 2.

[0021] The traction machine 3 includes a traction machine motor 4, a traction mechanism brake (not shown), and a drive sheave 5. The traction machine motor 4 rotates the drive sheave 5. The traction mechanism brake keeps the drive sheave 5 stationary. Additionally, the traction mechanism brakes the rotation of the drive sheave 5.

[0022] Multiple new cables 7 are wound around the drive pulley 5 and guide pulley 6. Figure 1 In the image, only one new cable 7 is shown.

[0023] The car 8 and counterweight 9 are suspended within the hoistway 1 by multiple new cables 7. Furthermore, the car 8 and counterweight 9 are raised and lowered within the hoistway 1 by rotating the drive sheave 5. In other words, the traction machine 3 raises and lowers the car 8 and counterweight 9 via multiple new cables 7.

[0024] A pair of car guide rails 10 and a pair of counterweight guide rails 11 are installed inside the hoistway 1. Figure 1 The image shows only one side of the car guide rail 10 and one side of the counterweight guide rail 11.

[0025] A pair of car guide rails 10 guide the lifting and lowering of the car 8. A pair of counterweight guide rails 11 guide the lifting and lowering of the counterweight 9.

[0026] The car 8 has a car frame 12 and a car compartment 13. Multiple new cables 7 are connected to the car frame 12. The car compartment 13 is supported by the car frame 12.

[0027] Figure 2 yes Figure 1 A cross-sectional view of the new cable 7 shows a section perpendicular to the length direction of the old cable. The new cable 7 is an 8×S (21) type rope. The new cable 7 has a new core 31 and multiple new steel strands 32.

[0028] Natural fibers can be used as the material for the new rope core 31, but long synthetic fibers are preferred. From the perspective of mechanical properties and manufacturing costs, polyester multifilaments are particularly preferred as synthetic fibers.

[0029] There are 8 new stock lines 32. Multiple new stock lines 32 are arranged around the outer periphery of the new rope core 31. In addition, multiple new stock lines 32 are twisted around the outer periphery of the new rope core 31.

[0030] Each new strand 32 has a first center wire 33, a first outer layer 34, and a first inner layer 35. The first outer layer 34 is disposed on the outer periphery of the first center wire 33, separated from the first inner layer 35. Furthermore, the first outer layer 34 is located at the outermost periphery of each new strand 32 and contacts the outer periphery of the new core 31. The first inner layer 35 is disposed between the first center wire 33 and the first outer layer 34.

[0031] The first outer layer 34 is composed of multiple first outer layer wires 36. The multiple first outer layer wires 36 are twisted together around the outer periphery of the first inner layer 35. The number of first outer layer wires 36 in each new strand 32 is preferably 10 or more and 15 or less. In this example, the number of first outer layer wires 36 in each new strand 32 is 10.

[0032] The first inner layer 35 is composed of multiple first inner layer wires 37. These multiple first inner layer wires 37 are twisted around the outer periphery of the first center wire 33. Each new strand 32 contains 10 first inner layer wires 37. The diameter of each first inner layer wire 37 is smaller than the diameter of each first outer layer wire 36. Thus, the cross-sectional structure of each new strand 32 is a Sear configuration.

[0033] The elevator modification method of Implementation Method 1 includes a rope replacement process. The rope replacement process involves replacing multiple old cables wound around the drive sheave 5 with multiple new cables 7. The multiple old cables are the cables wound around the drive sheave 5 before being replaced with the multiple new cables 7.

[0034] The traction machine 3 is designed to raise and lower the car 8 and counterweight 9 via multiple old cables. In embodiment 1, the traction machine 3, which is used before the rope replacement process, is still used after the rope replacement process.

[0035] The drive pulley 5 is equipped with multiple rope slots into which old cables are inserted. Each new cable 7 is inserted into the corresponding rope slot among the multiple rope slots.

[0036] Figure 3 This is a cross-sectional view of the old cable of Embodiment 1, showing a section perpendicular to the length direction of the old cable. The old cable 20 is an 8×S (19) type rope conforming to JIS G 3525. In addition, it is marked as 8×19S in the EN region.

[0037] The old cable 20 has an old rope core 21 and multiple old steel strands 22. Natural fibers are used as the material for the old rope core 21.

[0038] There are 8 old strands 22. That is, the number of new strands 32 is the same as the number of old strands 22. Multiple old strands 22 are arranged around the outer periphery of the old rope core 21. In addition, multiple old strands 22 are twisted around the outer periphery of the old rope core 21.

[0039] Each old strand 22 has a second center wire 23, a second outer layer 24, and a second inner layer 25. The second outer layer 24 is disposed on the outer periphery of the second center wire 23, separated from the second inner layer 25. Furthermore, the second outer layer 24 is located at the outermost periphery of each old strand 22 and contacts the outer periphery of the old core 21. The second inner layer 25 is disposed between the second center wire 23 and the second outer layer 24.

[0040] The second outer layer 24 is composed of multiple second outer layer wires 26. The multiple second outer layer wires 26 are twisted together around the outer periphery of the second inner layer 25. The number of second outer layer wires 26 in each strand 22 is 9.

[0041] The second inner layer 25 is composed of multiple second inner layer wires 27. The multiple second inner layer wires 27 are twisted around the outer periphery of the second central wire 23. The number of second inner layer wires 27 in each strand 22 is 9.

[0042] The tensile strength of each new cable 7 is higher than that of each old cable 20. The difference between the unit mass of each new cable 7 and the unit mass of each old cable 20, and the difference between the diameter of each new cable 7 and the diameter of each old cable 20, are all within the range where the traction machine 3 does not need to be replaced along with the replacement of the cables.

[0043] That is, the difference between the percentage of steel wire in each new cable 7 and the percentage of steel wire in each old cable 20 is within tolerance, and the difference between the unit mass of each new cable 7 and the unit mass of each old cable 20 is within tolerance. In addition, the difference between the diameter of each new cable 7 and the diameter of each old cable 20 is also within tolerance.

[0044] The difference between the unit mass of the new rope core 31 and the unit mass of the old rope core 21, and the difference between the tensile strength of each first outer layer wire 36 and the tensile strength of each second outer layer wire 26, are all within tolerance ranges. The tensile strength of each first outer layer wire 36 is 1770 N / m² or less, for example, 1620 N / mm² or 1770 N / mm².

[0045] The tensile strength of the first center wire 33 is higher than that of the second center wire 23. The tensile strength of each first inner layer wire 37 is higher than that of each second inner layer wire 27.

[0046] The number of first outer layer wires 36 in each new stock line 32 is greater than the number of second outer layer wires 26 in each old stock line 22. The number of first inner layer wires 37 in each new stock line 32 is greater than the number of second inner layer wires 27 in each old stock line 22.

[0047] The tensile strength of the first center wire 33 and the tensile strength of each of the first inner layer wires 37 are approximately 1.5 times the tensile strength of the second center wire 23 and the tensile strength of each of the second inner layer wires 27. That is, the tensile strength of the first center wire 33 and the tensile strength of each of the first inner layer wires 37 are both 2000 N / m² or higher, for example, 2300 N / mm² or 2400 N / mm².

[0048] The diameter of each first outer layer wire 36 is smaller than the diameter of each second outer layer wire 26. In addition, the cross-sectional area ratio of the multiple first outer layer wires 36 in each new strand 32 is lower than the cross-sectional area ratio of the multiple second outer layer wires 26 in each old strand 22.

[0049] Typically, when the difference in unit mass between the original and replacement cables reaches a certain level, the mass balance between the car and counterweight sides changes before and after the replacement. Consequently, the existing traction machine motor and brakes become unusable. Additionally, traction losses may sometimes occur.

[0050] Therefore, cables with a different unit mass than those used previously will be used in newly installed elevator systems. However, as a result of cable demand, a significant proportion of cables are used in the replacement of existing elevator systems during maintenance.

[0051] Another method to increase rope strength without changing the unit mass is to use high-strength fibers in the rope core material. However, high-strength fibers are usually expensive, making the overall cable costly.

[0052] Another method to simply increase cable strength is to upgrade the cable's strength grade by one level. However, if the tensile strength of each strand is increased to achieve higher cable strength, the stiffness of each strand also increases. Therefore, the contact pressure between the cable and the drive pulley increases, leading to problems such as premature wear of the drive pulley.

[0053] In contrast, in the elevator device and its modification method of Embodiment 1, the tensile strength of each new cable 7 is higher than the tensile strength of each old cable 20. Furthermore, the difference between the unit mass of each new cable 7 and the unit mass of each old cable 20 is within the range where it is not necessary to replace the traction machine 3 along with the cable replacement. Additionally, the difference between the diameter of each new cable 7 and the diameter of each old cable 20 is within the range where it is not necessary to replace the traction machine 3 along with the cable replacement.

[0054] Therefore, without replacing peripheral equipment including the traction machine 3, the interchangeability of the old cable 20 and the new cable 7 can be ensured, making it easy to improve the performance of the cable suspending the car 8. As a result, the maintenance and replacement cycle of the new cable 7 can be extended, and the life cycle cost can be reduced.

[0055] Furthermore, the new cable 7 can be used in both existing and newly installed elevator systems. Therefore, it allows for increased production of the new cable 7, improved production efficiency, and a reduction in the types of ropes required.

[0056] Furthermore, by making the strength of the new cable 7 higher than that of the old cable 20, it is sometimes possible to have fewer strands of the new cable 7 than the old cable 20 in a newly installed elevator. In this case, the number of rope grooves in the drive sheave of the newly installed traction machine can be reduced, thus achieving a thinner traction machine. Additionally, the guide sheaves can also be made thinner.

[0057] Furthermore, by continuing to use the traction machine 3, which was used before the rope replacement process, after the rope replacement process, the modification project can be made easier.

[0058] Furthermore, the tensile strength of the first center wire 33 is higher than that of the second center wire 23. Additionally, the number of first outer layer wires 36 in each new strand 32 is greater than the number of second outer layer wires 26 in each old strand 22. Furthermore, the difference between the unit mass of the new core 31 and the unit mass of the old core 21 is within tolerance. Additionally, the difference between the tensile strength of each first outer layer wire 36 and the tensile strength of each second outer layer wire 26 is also within tolerance.

[0059] Therefore, the hardness of each first outer layer wire 36 in contact with the drive pulley 5 in the new cable 7 remains unchanged compared to the hardness of each second outer layer wire 26. Thus, rope strength can be improved while ensuring interchangeability with the old cable 20, and premature damage to the new cable 7 or premature wear of the drive pulley 5 can be prevented.

[0060] Furthermore, the tensile strength of each first inner layer wire 37 is higher than that of each second inner layer wire 27. Additionally, the number of first inner layer wires 37 in each new strand 32 is greater than the number of second inner layer wires 27 in each old strand 22. Therefore, interchangeability with the old cable 20 can be more reliably ensured, while simultaneously increasing rope strength.

[0061] Furthermore, the tensile strength of each first center wire 33 and the tensile strength of each first inner layer wire 37 are both 2000 N / m² or higher. Therefore, the breaking load of the new cable 7 can be improved more reliably. In addition, the upper limit of tensile strength that can be achieved in the steel wire used in elevator equipment without increasing costs is approximately 2500 N / mm².

[0062] Furthermore, the tensile strength of each of the first outer layer wires 36 is below 1770 N / m². Therefore, damage to the new cable 7 and wear on the drive pulley 5 can be suppressed more reliably.

[0063] Furthermore, the number of new strands 32 is the same as the number of old strands 22. Additionally, the number of first outer layer wires 36 in each new strand 32 is 10 more than the number of second outer layer wires 26 in each old strand 22. Therefore, interchangeability with the old cable 20 can be more reliably ensured, while suppressing contact surface pressure between the new cable 7 and the drive pulley 5, and more reliably suppressing damage to the new cable 7 and wear on the drive pulley 5.

[0064] In addition, the new rope core 31 is made of long synthetic fibers. This enables the overall longevity of the new cable 7.

[0065] Furthermore, the cross-sectional structure of each new strand 32 is a simple Shell-type. Therefore, the new cable 7 can be easily manufactured using the same manufacturing apparatus as the old cable 20, and the manufacturing cost can be kept to the same level as that of the old cable 20.

[0066] Furthermore, the diameter of the cable in the elevator system is generally in the range of 8mm to 12mm. In such cables, the more the number of strands that make up the strands increases, the thinner the strands become. Moreover, if the number of strands exceeds 30, the equipment for manufacturing the strands is limited, thus increasing the manufacturing cost. Therefore, the number of strands in the first outer layer 36 is preferably 15 or less.

[0067] In addition, by setting the number of new strands 32 to 6 or more, the cross-sectional shape of the new cable 7 can be stabilized.

[0068] Figure 4 This is a cross-sectional view showing a first variation of the new cable 7 according to Embodiment 1. In the first variation, the number of first outer layer wires 36 in each new strand 32 is 11. In addition, the number of first inner layer wires 37 in each new strand 32 is also 11. That is, the new cable 7 in the first variation is an 8×S (23) type rope.

[0069] Figure 5 This is a cross-sectional view showing a second variation of the new cable 7 according to Embodiment 1. In the second variation, the number of first outer layer wires 36 in each new strand 32 is 12. In addition, the number of first inner layer wires 37 in each new strand 32 is also 12. That is, the new cable 7 in the second variation is an 8×S (25) type rope.

[0070] Figure 6 This is a cross-sectional view showing a third variation of the new cable 7 according to Embodiment 1. In the third variation, the number of first outer layer wires 36 in each new strand 32 is 13. In addition, the number of first inner layer wires 37 in each new strand 32 is also 13. That is, the new cable 7 in the thirty-sixth variation is an 8×S (27) type rope.

[0071] Figure 7 This is a cross-sectional view showing a fourth variation of the new cable 7 according to Embodiment 1. In the fourth variation, the number of first outer layer wires 36 in each new strand 32 is 14. In addition, the number of first inner layer wires 37 in each new strand 32 is also 14. That is, the new cable 7 in the fourth variation is an 8×S (29) type rope.

[0072] Figure 8 This is a cross-sectional view showing a fifth variation of the new cable 7 according to Embodiment 1. In the fifth variation, the number of first outer layer wires 36 in each new strand 32 is 15. In addition, the number of first inner layer wires 37 in each new strand 32 is also 15. That is, the new cable 7 in the fifth variation is an 8×S (31) type rope.

[0073] pass Figures 4-8The structure shown can also obtain the same Figure 2 The new cable 7 achieves the same effect. Furthermore, the increased contact area between the new cable 7 and the drive pulley 5 reduces the contact surface pressure. This allows for a further increase in the lifespan of the new cable 7.

[0074] Figure 9 This is a cross-sectional view showing a sixth variation of the new cable 7 according to Embodiment 1. In this sixth variation, each new strand 32 consists only of a first center wire 33 and a first outer layer 34. The first outer layer 34 is in direct contact with the outer periphery of the first center wire 33, rather than being separated by a first inner layer 35. That is, the new strand 32 in the sixth variation is a single-laytype. The number of first outer layer wires 36 in each new strand 32 is 13.

[0075] pass Figure 9 The structure shown can also obtain the same Figure 2 The new cable 7 has the same effect.

[0076] Furthermore, the diameter of the first center wire 33 in the single-layer type is larger than the diameter of the first center wire 33 in the Sil type. Therefore, the new cable 7 of the sixth modification is suitable for applications in elevator devices with small cable diameters.

[0077] In addition, the number of strands in both the new cable 7 and the old cable 20 is not limited to 8.

[0078] In addition, the structure of the new cable 7 can also be applied to cables other than those suspending the car 8, such as balance ropes or speed controller ropes.

[0079] In addition, the overall layout of the elevator system is not limited to Figure 1 The layout. For example, the rope ratio can also be 2:1.

[0080] In addition, elevator systems can also be machine-room-less elevators, double-decker elevators, or single-shaft multi-car elevator systems. A single-shaft multi-car system is a system where the upper car and the lower car, located directly below the upper car, move independently in a shared shaft.

[0081] Explanation of reference numerals in the attached figures

[0082] 3…traction machine; 5…drive pulley; 7…new cable; 8…car; 20…old cable; 21…old core; 22…old strand; 23…second center wire; 24…second outer layer; 25…second inner layer; 26…second outer layer wire; 27…second inner layer wire; 31…new core; 32…new strand; 33…first center wire; 34…first outer layer; 35…first inner layer; 36…first outer layer wire; 37…first inner layer wire.

Claims

1. An elevator device, characterized in that, have: Several new cables; The car, suspended within the hoistway by the aforementioned new cables; and The traction machine has a drive pulley on which the plurality of new cables are wound, thereby raising and lowering the car via the plurality of new cables. The traction machine is designed to raise and lower the car via cables, i.e., multiple old cables, that are wound around the drive pulley before being replaced with the multiple new cables. The tensile strength of each of the new cables is higher than the tensile strength of each of the old cables. The difference between the unit mass of each new cable and the unit mass of each old cable, and the difference between the diameter of each new cable and the diameter of each old cable, are all within the range where the traction machine does not need to be replaced along with the cable replacement.

2. The elevator device according to claim 1, characterized in that, Each of the new cables has a new core and multiple new steel strands arranged around the outer periphery of the new core. Each of the aforementioned new stock lines has: First center wire; and The first outer layer is composed of multiple outer layer wires and is arranged around the outer periphery of the first central wire. Each of the aforementioned used cables has a used rope core and multiple used steel strands disposed around the outer periphery of the used rope core. Each of the aforementioned old stock lines has: Second center wire; and The second outer layer, composed of multiple outer layer wires, is arranged around the outer periphery of the second central wire. The tensile strength of the first center wire is higher than that of the second center wire. The number of the first outer layer wires in each of the new stock lines is greater than the number of the second outer layer wires in each of the old stock lines. The difference between the unit mass of the new rope core and the unit mass of the old rope core, and the difference between the tensile strength of each of the first outer layer wires and the tensile strength of each of the second outer layer wires, are all within tolerance ranges.

3. The elevator device according to claim 2, characterized in that, Each of the aforementioned new stock lines also has a first inner layer, which is composed of multiple first inner layer wires and is disposed between the first central wire and the first outer layer. The aforementioned old stock lines also have: Second center wire; and The second inner layer, composed of multiple inner layer wires, is positioned between the second central wire and the second outer layer. The tensile strength of each of the first inner layer wires is higher than the tensile strength of each of the second inner layer wires. The number of the first inner layer wires in each of the new stock lines is greater than the number of the second inner layer wires in each of the old stock lines.

4. The elevator device according to claim 3, characterized in that, The tensile strength of the first center wire and the tensile strength of each of the first inner layer wires are both above 2000 N / m².

5. The elevator device according to any one of claims 2 to 4, characterized in that, The tensile strength of each of the first outer layer wires is less than 1770 N / m².

6. The elevator device according to any one of claims 2 to 5, characterized in that, The number of new stock lines is the same as the number of old stock lines. The number of the first outer layer wires in each of the aforementioned new stock lines is more than 10 and less than 15.

7. The elevator device according to any one of claims 2 to 6, characterized in that, The new rope core is made of long fibers of synthetic fiber.

8. A method for modifying an elevator device, characterized in that, This includes the rope replacement process, which involves replacing multiple old cables wound around the drive sheave of the traction machine with multiple new cables. The tensile strength of each of the new cables is higher than the tensile strength of each of the old cables. The difference between the unit mass of each new cable and the unit mass of each old cable, and the difference between the diameter of each new cable and the diameter of each old cable, are all within the range where the traction machine does not need to be replaced along with the cable replacement.

9. The method for modifying an elevator device according to claim 8, characterized in that, The traction machine used before the rope replacement process is still used after the rope replacement process.

10. The method for modifying an elevator device according to claim 8 or 9, characterized in that, The number of new cables is less than the number of old cables.

11. The method for modifying an elevator device according to any one of claims 8 to 10, characterized in that, Each of the new cables has a new core and multiple new steel strands arranged around the outer periphery of the new core. Each of the aforementioned new stock lines has: First center wire; and The first outer layer is composed of multiple outer layer wires and is arranged around the outer periphery of the first central wire. Each of the aforementioned used cables has a used rope core and multiple used steel strands disposed around the outer periphery of the used rope core. Each of the aforementioned old stock lines has: Second center wire; and The second outer layer, composed of multiple outer layer wires, is arranged around the outer periphery of the second central wire. The tensile strength of the first center wire is higher than that of the second center wire. The number of the first outer layer wires in each of the new stock lines is greater than the number of the second outer layer wires in each of the old stock lines. The difference between the unit mass of the new rope core and the unit mass of the old rope core, and the difference between the tensile strength of each of the first outer layer wires and the tensile strength of each of the second outer layer wires, are all within tolerance ranges.

12. The method for modifying an elevator device according to claim 11, characterized in that, Each of the aforementioned new stock lines also has a first inner layer, which is composed of multiple first inner layer wires and is disposed between the first central wire and the first outer layer. The aforementioned old stock lines also have: Second center wire; and The second inner layer, composed of multiple inner layer wires, is positioned between the second central wire and the second outer layer. The tensile strength of each of the first inner layer wires is higher than the tensile strength of each of the second inner layer wires. The number of the first inner layer wires in each of the new stock lines is greater than the number of the second inner layer wires in each of the old stock lines.

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