Elevator device and its modification method

Abstract

This repair method for an elevator device includes: a rail shortening step for lowering the height of a pair of balance weight guide rails from a bottom section of a hoistway when compared to the height before a repair; a hoisting machine installation step for supporting a repaired hoisting machine with at least one of the pair of balance weight guide rails at a location higher than the raising / lowering stroke of a balance weight; and a winding step for winding a suspended body so that the movement speed of the balance weight with respect to the rotation speed of a drive sheave is lower than the movement speed of the car with respect to the rotation speed of the drive sheave.

Description

Technical Field

[0001] The present disclosure relates to an elevator device and a method for modifying the same.

Background Art

[0002] In a conventional method for modifying a machine-roomless elevator, a new hoisting machine is installed at the top of the hoistway without removing the existing hoisting machine. The existing hoisting machine is installed in the pit of the hoistway and is used as a counterweight after the modification (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional method for modifying a machine-roomless elevator as described above, a new hoisting machine is installed at the top of the hoistway. Therefore, a vertical space for installing the new hoisting machine is required at the top of the hoistway, and it is difficult to carry out the modification work in a building where space cannot be secured.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain an elevator device and a method for modifying the same that can easily secure an installation space for a hoisting machine in the hoistway regardless of the space at the top of the hoistway.

Means for Solving the Problems

[0006] The elevator device according to the present disclosure is provided in a hoistway and has a hoisting machine having a drive sheave, a suspension body wound around the drive sheave, a pair of car guide rails installed in the hoistway, a pair of counterweight guide rails installed in the hoistway, a car suspended by the suspension body and moving up and down in the hoistway guided by the pair of car guide rails as the drive sheave rotates, and a counterweight suspended by the suspension body and moving up and down in the hoistway guided by the pair of counterweight guide rails as the drive sheave rotates. The moving speed of the counterweight with respect to the rotational speed of the drive sheave is lower than the moving speed of the car with respect to the rotational speed of the drive sheave. The height of the pair of counterweight guide rails from the bottom of the hoistway is lower than the height of the pair of car guide rails from the bottom. The hoisting machine is supported by at least one of the pair of counterweight guide rails above the lifting and lowering stroke of the counterweight. The method for modifying the elevator device according to the present disclosure includes a rail shortening step of making the height of the pair of counterweight guide rails from the bottom of the hoistway lower than the height before modification, a hoisting machine installation step of supporting the hoisting machine after modification by at least one of the pair of counterweight guide rails above the lifting and lowering stroke of the counterweight, and a winding step of winding the suspension body so that the moving speed of the counterweight with respect to the rotational speed of the drive sheave is lower than the moving speed of the car with respect to the rotational speed of the drive sheave.

Advantages of the Invention

[0007] According to the present disclosure, the installation space of the hoisting machine can be easily secured in the hoistway regardless of the space at the top of the hoistway.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1. FIG. 1 is a schematic perspective view showing the elevator device before modification. FIG. 2 is a plan view showing the elevator device in FIG. 1.

[0010] In the figure, a hoisting machine 2 before modification is installed at the bottom of the hoistway 1. The hoisting machine 2 has a hoisting machine body 3 and a drive sheave 4.

[0011] The hoisting machine body 3 has a hoisting machine motor (not shown) and a hoisting machine brake (not shown). The hoisting machine motor rotates the drive sheave 4. The hoisting machine brake holds the drive sheave 4 in a stationary state. Further, the hoisting machine brake brakes the rotation of the drive sheave 4.

[0012] In the hoistway 1, a first car guide rail 5 and a second car guide rail 6 are installed as a pair of car guide rails. Also, in the hoistway 1, a first counterweight guide rail 7 and a second counterweight guide rail 8 are installed as a pair of counterweight guide rails.

[0013] A car 9 is disposed between the first car guide rail 5 and the second car guide rail 6. The car 9 is guided by the first car guide rail 5 and the second car guide rail 6 and moves up and down in the hoistway 1.

[0014] Between the first counterweight guide rail 7 and the second counterweight guide rail 8, the counterweight 10 before modification is arranged. The counterweight 10 is guided by the first counterweight guide rail 7 and the second counterweight guide rail 8 and moves up and down in the hoistway 1.

[0015] Viewing the hoistway 1 from directly above, the first counterweight guide rail 7, the second counterweight guide rail 8, and the counterweight 10 are arranged on the same side of the car 9 as the second car guide rail 6 and on the opposite side of the first car guide rail 5.

[0016] At the lower part of the car 9, a first car hoist 11 and a second car hoist 12 are provided. At the upper part of the counterweight 10, a counterweight hoist 13 is provided.

[0017] At the top of the hoistway 1, a top beam 14 is provided. The top beam 14 is installed between the upper ends of the first counterweight guide rail 7 and the second counterweight guide rail 8. On the top beam 14, a first return pulley 15 and a second return pulley 16 are provided.

[0018] The suspension body 17 before modification is wound around the drive sheave 4. In FIG. 2, only a part of the suspension body 17 is shown. As the suspension body 17, a plurality of ropes or a plurality of belts are used.

[0019] The suspension body 17 has a first end and a second end. At the top of the hoistway 1, a first rope fixing device (not shown) is provided. The first end of the suspension body 17 is connected to the first rope fixing device. On the top beam 14, a second rope fixing device (not shown) is provided. The second end of the suspension body 17 is connected to the second rope fixing device.

[0020] Also, the suspension body 17 is wound around the first car hoist 11, the second car hoist 12, the second return pulley 16, the drive sheave 4, the first return pulley 15, and the counterweight hoist 13 in order from the first end side.

[0021] The car 9 and the counterweight 10 are each suspended by a suspension 17 in a 2:1 roping system. Also, the car 9 and the counterweight 10 move up and down in the hoistway 1 as the drive sheave 4 rotates.

[0022] Each of the first counterweight guide rail 7 and the second counterweight guide rail 8 is composed of a plurality of rail members 20 joined together in the vertical direction. Each rail member 20 is fixed in the hoistway 1 via a plurality of rail brackets (not shown).

[0023] FIG. 3 is a schematic perspective view showing an elevator apparatus after being modified by the modification method of Embodiment 1. FIG. 4 is an enlarged perspective view showing a main part of the elevator apparatus of FIG. 3. FIG. 5 is a plan view showing the elevator apparatus of FIG. 4. FIG. 6 is a side view showing the top of the hoistway 1 of FIG. 4.

[0024] In Embodiment 1, both the elevator apparatus before modification and the elevator apparatus after modification are machine-room-less elevators.

[0025] In the elevator apparatus after modification, the heights of the first counterweight guide rail 7 and the second counterweight guide rail 8 from the bottom of the hoistway 1 are lower than those before modification. Thereby, the heights of the first counterweight guide rail 7 and the second counterweight guide rail 8 from the bottom of the hoistway 1 are lower than the heights of the first car guide rail 5 and the second car guide rail 6 from the bottom of the hoistway 1.

[0026] A machine table 21 is installed at the upper ends of the first counterweight guide rail 7 and the second counterweight guide rail 8. A modified hoisting machine 22 is installed on the machine table 21. That is, the hoisting machine 22 is supported by the first counterweight guide rail 7 and the second counterweight guide rail 8 via the machine table 21.

[0027] The hoisting machine 22 has a hoisting machine main body 23 and a drive sheave 24. The hoisting machine main body 23 has a hoisting machine motor (not shown) and a hoisting machine brake (not shown). The hoisting machine motor rotates the drive sheave 24. The hoisting machine brake holds the drive sheave 24 in a stationary state. Further, the hoisting machine brake brakes the rotation of the drive sheave 24.

[0028] As the hoisting machine 22, a thin-type hoisting machine is used. The thin-type hoisting machine is a hoisting machine whose axial dimension is smaller than the dimension in the direction perpendicular to the axial direction.

[0029] Between the first counterweight guide rail 7 and the second counterweight guide rail 8, the modified counterweight 25 is arranged. The counterweight 25 is guided by the first counterweight guide rail 7 and the second counterweight guide rail 8 and moves up and down in the lifting path 1. The hoisting machine 22 is arranged above the lifting and lowering stroke of the counterweight 25.

[0030] On the upper part of the counterweight 25, a first counterweight suspension carriage 26 and a second counterweight suspension carriage 27 are provided. On the machine base 21, a return pulley 28 is provided.

[0031] When looking directly down at the lifting path 1, each of the rotation axes of the first counterweight suspension carriage 26, the second counterweight suspension carriage 27, and the return pulley 28 is inclined by the same angle in the same direction with respect to the straight line connecting the centers of the first and second counterweight guide rails 7, 8.

[0032] The former first cage guide rail 5, the former second cage guide rail 6, and the former cage 9 are still used as they are after the modification.

[0033] The modified suspension body 29 is wound around the drive sheave 24. In FIG. 5, only a part of the suspension body 29 is shown. Also, in FIG. 6, the suspension body 29 is omitted. As the suspension body 29, a plurality of ropes or a plurality of belts are used.

[0034] The suspension body 29 has a first end and a second end. The first end of the suspension body 29 is connected to the first wire stop. The machine base 21 is provided with a second wire stop (not shown). The second end of the suspension body 29 is connected to the second wire stop.

[0035] Also, the suspension body 29 is wound around, in order from the first end side, the first cage hoist 11, the second cage hoist 12, the drive sheave 24, the first counterweight hoist 26, the return pulley 28, and the second counterweight hoist 27.

[0036] The cage 9 is suspended by the suspension body 29 in a 2:1 roping system. The counterweight 25 is suspended by the suspension body 29 in a 4:1 roping system.

[0037] The cage 9 and the counterweight 25 move up and down in the hoistway 1 when the drive sheave 24 rotates. The moving speed of the counterweight 25 with respect to the rotational speed of the drive sheave 24 is lower than the moving speed of the cage 9 with respect to the rotational speed of the drive sheave 24.

[0038] The lifting and lowering stroke of the modified counterweight 25 is half of the lifting and lowering stroke of the pre-modification counterweight 10. The mass of the modified counterweight 25 is larger than the mass of the pre-modification counterweight 10. The lowest position during the lifting and lowering of the modified counterweight 25 is the same as the lowest position during the lifting and lowering of the pre-modification counterweight 10.

[0039] Figure 7 is a schematic process diagram showing the modification method of Embodiment 1. The modification method of Embodiment 1 includes a weight lifting process S101, a rail shortening process S102, a winch installation process S103, a counterweight installation process S104, a winding process S105, and a winch removal process S106.

[0040] In the weight lifting process S101, a weight lifting device (not shown) is installed at the top of the hoistway 1, and the cage 9 is lifted by the weight lifting device. Then, the pre-modification suspension body 17, the pre-modification counterweight 10, the top beam 14, the first return pulley 15, and the second return pulley 16 are removed. As the weight lifting device, for example, a chain block is used.

[0041] The rail shortening step S102 is a step of making the heights of the first counterweight guide rail 7 and the second counterweight guide rail 8 from the bottom of the hoistway 1 lower than the heights before the modification.

[0042] Specifically, the heights of the first counterweight guide rail 7 and the second counterweight guide rail 8 are made lower by removing at least the uppermost rail member 20 from each of the first counterweight guide rail 7 and the second counterweight guide rail 8.

[0043] The hoisting machine installation step S103 is a step of supporting the modified hoisting machine 22 by the first counterweight guide rail 7 and the second counterweight guide rail 8 above the lifting stroke of the modified counterweight 25.

[0044] Specifically, a machine base 21 is installed at the upper ends of the first counterweight guide rail 7 and the second counterweight guide rail 8. Then, the modified hoisting machine 22 is installed on the machine base 21.

[0045] In the counterweight installation step S104, the modified counterweight 25 is installed between the first counterweight guide rail 7 and the second counterweight guide rail 8.

[0046] The winding step S105 is a step of winding the modified suspension body 29 so that the moving speed of the counterweight 25 with respect to the rotational speed of the drive sheave 24 is lower than the moving speed of the car 9 with respect to the rotational speed of the drive sheave 24.

[0047] Specifically, a return car 28 is installed on the machine base 21. Then, the suspension body 29 is wound around the first car suspension 11, the second car suspension 12, the drive sheave 24, the first counterweight suspension 26, the return car 28, and the second counterweight suspension 27. Also, the first end of the suspension body 29 is connected to the first wire stop, and the second end of the suspension body 29 is connected to the second wire stop.

[0048] As a result, the cage 9 is suspended by the suspension body 29 in a 2:1 roping system. Also, the counterweight 25 is suspended by the suspension body 29 in a 4:1 roping system.

[0049] Operations on the first counterweight guide rail 7, the second counterweight guide rail 8, the machine base 21, the overhauled hoist 22, the return car 28, etc. are performed from above the cage 9 with the cage 9 lifted by the hoisting device.

[0050] The hoist removal step S106 is a step of removing the pre-overhaul hoist 2 installed at a position lower than the overhauled hoist 22 from the hoistway 1.

[0051] In such an overhauled elevator device, the moving speed of the counterweight 25 with respect to the rotational speed of the drive sheave 24 is lower than the moving speed of the cage 9 with respect to the rotational speed of the drive sheave 24. Also, the heights of the first counterweight guide rail 7 and the second counterweight guide rail 8 from the bottom of the hoistway 1 are lower than the heights of the first cage guide rail 5 and the second cage guide rail 6 from the bottom of the hoistway 1. Also, the hoist 22 is supported by the first counterweight guide rail 7 and the second counterweight guide rail 8 above the lifting and lowering stroke of the counterweight 25.

[0052] Therefore, regardless of the space at the top of the hoistway 1, the installation space for the hoist 22 can be easily secured within the hoistway 1.

[0053] Also, even if the bottom of the hoistway 1 is flooded by chance, the hoist 22 can be prevented from getting wet.

[0054] Also, when viewed from directly above the hoistway 1, the rotation axes of the first counterweight hoist 26 and the second counterweight hoist 27 are each inclined in the same direction with respect to the straight line connecting the centers of the first and second counterweight guide rails 7 and 8. Therefore, without changing the positions of the first and second counterweight guide rails 7 and 8 from before the modification, the first counterweight hoist 26 and the second counterweight hoist 27 can be installed on the counterweight 25, and the roping method on the counterweight 25 side can be changed.

[0055] Also, the lowest position during the lifting and lowering of the counterweight 25 after the modification is the same as the lowest position during the lifting and lowering of the counterweight 10 before the modification. Therefore, in the elevator apparatus before the modification, if a counterweight buffer (not shown) is installed at the bottom of the hoistway 1, the counterweight buffer can be reused as it is even after the modification.

[0056] Also, in the method for modifying the elevator apparatus according to Embodiment 1, the heights of the first counterweight guide rail 7 and the second counterweight guide rail 8 are made lower than the heights before the modification. Also, the winch 22 after the modification is supported by the first counterweight guide rail 7 and the second counterweight guide rail 8 above the lifting and lowering stroke of the counterweight 25. Also, the suspension body 29 is looped around so that the moving speed of the counterweight 25 with respect to the rotational speed of the drive sheave 24 is lower than the moving speed of the car 9 with respect to the rotational speed of the drive sheave 24.

[0057] Therefore, regardless of the space at the top of the hoistway 1, the installation space for the winch 22 can be easily secured within the hoistway 1.

[0058] Also, in the rail shortening step S102, at least the rail member 20 located at the uppermost position is removed from each of the first counterweight guide rail 7 and the second counterweight guide rail 8. Therefore, while reusing the first counterweight guide rail 7 and the second counterweight guide rail 8 before the modification, the heights of the first counterweight guide rail 7 and the second counterweight guide rail 8 can be easily lowered. Thereby, the modification construction period can be shortened.

[0059] Also, in the hoist removal process S106, the hoist 2 before renovation is removed. Therefore, the space in the hoistway 1 can be effectively utilized.

[0060] In addition, the car 9 before renovation, the first car guide rail 5 before renovation, and the second car guide rail 6 before renovation are reused as they are after renovation. Therefore, the renovation period can be shortened. Further, the car 9 before renovation can be lifted along the first car guide rail 5 before renovation and the second car guide rail 6 before renovation, and renovation work can be performed from above the car 9.

[0061] Also, work on the first counterweight guide rail 7 and the second counterweight guide rail 8 is performed from above the car 9 with the car 9 lifted by the hoisting device. Thereby, work on the first counterweight guide rail 7 and the second counterweight guide rail 8 can be easily performed.

[0062] In the first embodiment, the roping method on the car 9 side after renovation is the 2:1 roping method, and the roping method on the counterweight 25 side after renovation is the 4:1 roping method. However, if the moving speed of the counterweight 25 with respect to the rotational speed of the drive sheave 24 is lower than the moving speed of the car 9 with respect to the rotational speed of the drive sheave 24, each roping method is not limited to the above example.

[0063] That is, when the car 9 is suspended by the m:1 roping method and the counterweight 25 is suspended by the n:1 roping method, m may be a positive integer and n may be a positive number greater than m.

[0064] Also, the hoist 22 after renovation may be supported by only one of the first counterweight guide rail 7 and the second counterweight guide rail 8.

[0065] Also, the hoist 22 after renovation does not necessarily have to be a new hoist. That is, the hoist 2 before renovation may be moved and used as the hoist after renovation.

[0066] Also, the order of the repair work can be changed as appropriate and is not limited to the order in FIG. 7. For example, immediately after the suspension body 17 before repair is removed, the hoist 2 before repair may be removed.

Explanation of Signs

[0067] 1 hoistway, 2 hoist before repair, 4 drive sheave, 5 first car guide rail, 6 second car guide rail, 7 first counterweight guide rail, 8 second counterweight guide rail, 9 car, 10 counterweight before repair, 17 suspension body before repair, 20 rail member, 22 hoist after repair, 24 drive sheave, 25 counterweight after repair, 26 first counterweight hoist, 27 second counterweight hoist, 29 suspension body after repair.

Claims

1. A hoisting machine provided in an elevator shaft and having a drive sheave, A suspension body wound around the drive sheave, A pair of car guide rails installed in the elevator shaft, A pair of counterweight guide rails installed in the elevator shaft, A car suspended by the suspension body and moving up and down in the elevator shaft guided by the pair of car guide rails when the drive sheave rotates, and A counterweight suspended by the suspension body and moving up and down in the elevator shaft guided by the pair of counterweight guide rails when the drive sheave rotates Comprising, The car is suspended in a 2:1 roping system, The counterweight is suspended in a 4:1 roping system, The height of the pair of counterweight guide rails from the bottom of the elevator shaft is lower than the height of the pair of car guide rails from the bottom, A machine base is installed at the upper ends of the pair of counterweight guide rails, On the machine base, the hoisting machine and the return pulley are installed, In the car, a first car suspension pulley and a second car suspension pulley are provided, In the counterweight, a first counterweight suspension pulley and a second counterweight suspension pulley are provided, An elevator apparatus in which the suspension body is wound around the first car suspension pulley, the second car suspension pulley, the drive sheave, the first counterweight suspension pulley, the return pulley, and the second counterweight suspension pulley in this order.

2. The elevator apparatus according to claim 1, wherein when viewed from directly above the elevator shaft, the rotation axes of the first counterweight suspension pulley and the second counterweight suspension pulley are inclined in the same direction with respect to a straight line connecting the centers of the pair of counterweight guide rails.

3. A method for modifying an elevator apparatus with a 2:1 roping system, comprising: A rail shortening step of making the height of a pair of counterweight guide rails from the bottom of the elevator shaft lower than the height before modification, A hoisting machine installation step of supporting the modified hoisting machine above the lifting and lowering stroke of the counterweight by at least one of the pair of counterweight guide rails, and A winding step of winding the suspension body so that the roping system on the car side after modification is a 2:1 roping system and the roping system on the counterweight side after modification is a 4:1 roping system A method for modifying an elevator apparatus including.

4. In the rail shortening step, the height of the pair of counterweight guide rails is reduced by removing at least the uppermost rail member among the plurality of rail members constituting each counterweight guide rail. The method for modifying an elevator apparatus according to claim 3.

5. A hoist removal step of removing a pre-modification hoist installed at a position lower than the post-modification hoist The method for modifying an elevator apparatus according to claim 3 or claim 4, further including this.

6. The method for modifying an elevator apparatus according to claim 3 or claim 4, wherein the pre-modification car and the pair of pre-modification car guide rails are also reused after modification.

7. The method for modifying an elevator apparatus according to claim 6, wherein the work on the pair of counterweight guide rails is performed from above the car with the car lifted by a hoisting device.

Images