Elevator hoist sheave extraction method and hoist sheave extraction jig

Abstract

To provide a method for extracting an elevator hoist sheave, capable of preventing damage to the hoist. [Solution] In a first plate mounting step of an elevator hoist sheave extraction method according to an embodiment, a first plate is mounted to the hoist via hoist-side bolts. In a second plate mounting step, a second plate is mounted to an engagement structure engaged with a sheave groove of the hoist sheave via sheave-side bolts. The second plate is positioned farther from the hoist than the first plate. In a first extraction step, the second plate is moved in a direction away from the hoist to move the hoist sheave relative to the sheave shaft. In the first extraction step, the first plate presses against the sheave shaft.

Description

[Technical Field]

[0001] The embodiments relate to a method for extracting an elevator hoist sheave and a hoist sheave extraction jig. [Background technology]

[0002] A traction machine sheave is connected to the elevator traction machine. When replacing the traction machine sheave, a special tool is used to pull the traction machine sheave out of the sheave shaft connected to the traction machine shaft.

[0003] However, there is a problem that the sheave shaft moves together with the hoist sheave at the moment the hoist sheave comes off the sheave shaft, which may damage the hoist. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-51791 [Patent Document 2] Japanese Patent Application Publication No. 2023-150366 Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments aim to provide a method for extracting an elevator hoist sheave and a hoist sheave extraction jig that can prevent damage to the hoist.

[0006] The embodiment is a hoist sheave extraction method for extracting a hoist sheave from a sheave shaft connected to an elevator hoist. The hoist sheave extraction method includes an engagement step of engaging an engagement structure with the sheave groove of the hoist sheave, a bolt installation step of attaching one end of a plurality of hoist-side bolts, each extending in the axial direction of the sheave shaft, to the hoist and attaching one end of a plurality of sheave-side bolts, each extending in the axial direction, to the engagement structure, a first plate installation step of attaching a first plate to the other end of each hoist-side bolt and passing each sheave-side bolt through the first plate, and a first plate installation step of attaching a first plate to the other end of each sheave-side bolt. The method includes a second plate attaching step of attaching a second plate that is positioned farther from the hoist than the rate, a first extraction step of moving the second plate in a direction away from the hoist to move the hoist sheave together with the engagement structure relative to the sheave shaft, a first plate moving step of moving the first plate in a direction away from the hoist, and a second extraction step of moving the first plate and the second plate in a direction away from the hoist to extract the hoist sheave together with the engagement structure from the sheave shaft. In the first extraction step, the first plate presses against the sheave shaft.

[0007] The embodiment is a hoist sheave extraction jig for extracting a hoist sheave from a sheave shaft connected to an elevator hoist. The hoist sheave extraction jig includes an engagement structure that engages with the sheave groove of the hoist sheave, a first plate facing the engagement structure and capable of pressing the sheave shaft, a second plate facing the first plate and arranged on the opposite side of the engagement structure from the first plate, a plurality of hoist-side bolts having one end attached to the hoist and the other end attached to the first plate, and a plurality of sheave-side bolts having one end attached to the engagement structure and the other end attached to the second plate, the plurality of sheave-side bolts penetrating the first plate. [Brief explanation of the drawings]

[0008] [Figure 1]FIG. 1 is a perspective view showing a hoist sheave connected to an elevator hoist. [Figure 2] FIG. 2 is a perspective view showing an elevator hoisting machine sheave extraction jig according to an embodiment. [Figure 3] 3(a) is a partial cross-sectional view showing the engagement structure shown in FIG. 2, FIG. 3(b) is a plan view showing the engagement plate, and FIG. 3(c) is a plan view showing the adapter plate. [Figure 4] FIG. 4 is a perspective view for explaining an engaging step and a bolt attaching step in the elevator hoisting machine sheave extraction method according to the embodiment. [Figure 5] FIG. 5 is a perspective view for explaining a first plate attaching step in the elevator hoisting machine sheave extraction method according to the embodiment. [Figure 6] FIG. 6 is a perspective view for explaining a second plate attaching step in the elevator hoisting machine sheave extraction method according to the embodiment. [Figure 7] FIG. 7 is a side view for explaining a first extraction step in the elevator hoisting machine sheave extraction method according to the embodiment. [Figure 8] FIG. 8 is a side view illustrating the first drawing step following FIG. [Figure 9] FIG. 9 is a side view for explaining a first plate moving step in the elevator hoisting machine sheave extraction method according to the embodiment. [Figure 10] FIG. 10 is a side view for explaining a second extraction step in the elevator hoisting machine sheave extraction method according to the embodiment. [Figure 11] FIG. 11 is a perspective view illustrating the second drawing step following FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An elevator hoist sheave extraction jig and hoist sheave extraction method according to an embodiment will be described below with reference to the drawings. First, the hoist and the hoist sheave will be described with reference to FIG.

[0010] As shown in Fig. 1, a sheave shaft 2 is connected to a hoisting machine 1. The sheave shaft 2 may be formed integrally with a shaft (not shown) of the hoisting machine 1. A hoisting machine sheave 3 is fitted onto the sheave shaft 2. The hoisting machine sheave 3 is attached to the sheave shaft 2 using a key 4 so as to rotate synchronously with the sheave shaft 2.

[0011] A plurality of sheave grooves 5 are formed on the outer peripheral surface of the hoisting machine sheave 3. A main rope (not shown) is wound around the sheave groove 5. When the hoisting machine 1 is driven, the hoisting machine sheave 3 rotates and the main rope is wound up. This causes the car and counterweight (not shown) to rise and fall in the hoistway.

[0012] Next, an elevator hoist sheave extraction jig according to this embodiment (hereinafter referred to as hoist sheave extraction jig 10) will be described with reference to Figs. 2 and 3. The hoist sheave extraction jig 10 is a jig for extracting the hoist sheave 3 from the sheave shaft 2 connected to the hoist 1.

[0013] As shown in Figure 2, the hoist sheave extraction jig 10 includes an engagement structure 20, a first plate 30, a second plate 40, a plurality of hoist side bolts 50, and a plurality of sheave side bolts 60.

[0014] As shown in Figures 2 and 3(a), the engagement structure 20 is configured to engage with the sheave groove 5 of the hoist sheave 3. As shown in Figure 3(a), the engagement structure 20 may include a plurality of engagement plates 21 and a plurality of adapter plates 22. The engagement plates 21 and the adapter plates 22 may be alternately stacked.

[0015] Each engagement plate 21 is configured to be able to engage with a corresponding sheave groove 5 of the hoisting machine sheave 3. As shown in Fig. 3(b), the engagement plate 21 may be formed in a circular ring shape. The engagement plate 21 may engage with one sheave groove 5, and may enter and engage with the sheave groove 5 over substantially the entire circumference of the sheave groove 5.

[0016] Each engagement plate 21 may include a first engagement plate member 23 and a second engagement plate member 24. When viewed in the axial direction D of the sheave shaft 2, the first engagement plate member 23 is inserted into the sheave groove 5 from one side, and the second engagement plate member 24 is inserted into the sheave groove 5 from the other side. In the example shown in FIG. 3( b), the first engagement plate member 23 is inserted into the sheave groove 5 from above, and the second engagement plate member 24 is inserted into the sheave groove 5 from below. The first engagement plate member 23 and the second engagement plate member 24 may each be formed in a semicircular ring shape. The first engagement plate member 23 and the second engagement plate member 24 may be positioned 180° apart from each other when viewed in the axial direction D. The first engagement plate member 23 and the second engagement plate member 24 may be combined to form a circular ring-shaped engagement plate 21.

[0017] Engagement plate through holes 25, through which sheave-side bolts 60 pass, are formed in the first engagement plate member 23 and the second engagement plate member 24. A plurality of engagement plate through holes 25 are formed in each of the first engagement plate member 23 and the second engagement plate member 24. The engagement plate through holes 25 are arranged at equal angular pitches when viewed as the engagement plate 21.

[0018] As shown in FIG. 3(a), the adapter plate 22 is interposed between two adjacent engagement plates 21. The adapter plate 22 does not engage with the sheave groove 5 of the hoisting machine sheave 3, but faces a portion of the outer circumferential surface of the hoisting machine sheave 3 between two adjacent sheave grooves 5. As shown in FIG. 3(c), the adapter plate 22 may be formed in a circular ring shape. The inner diameter of the adapter plate 22 may be larger than the inner diameter of the engagement plate 21. The outer diameter of the adapter plate 22 may be equal to the outer diameter of the engagement plate 21.

[0019] Each adapter plate 22 may include a first adapter plate member 26 and a second adapter plate member 27. The first adapter plate member 26 and the second adapter plate member 27 may be arranged at positions offset by 180° from each other when viewed in the axial direction D. When viewed in the axial direction D, the first adapter plate member 26 moves from one side toward the outer peripheral surface of the hoist machine sheave 3, and the second adapter plate member 27 moves from the other side toward the outer peripheral surface of the hoist machine sheave 3. The first adapter plate member 26 and the second adapter plate member 27 may be combined to form a circular ring-shaped adapter plate 22.

[0020] As shown in Figures 3(b) and 3(c), the first adapter plate member 26 and the second adapter plate member 27 are formed with adapter plate through holes 28 through which the sheave-side bolts 60 pass. The first adapter plate member 26 and the second adapter plate member 27 each have a plurality of adapter plate through holes 28 formed therein. The adapter plate through holes 28 are arranged at equal angular pitches when viewed as the adapter plate 22. The engagement plate 21 and the adapter plate 22 are overlapped so that the adapter plate through holes 28 overlap the engagement plate through holes 25.

[0021] The engagement plate 21 and the adapter plate 22 may be overlapped with a circumferential offset according to the angular pitch of the engagement plate through holes 25 and the adapter plate through holes 28. In this embodiment, the engagement plate 21 has eight engagement plate through holes 25 and the adapter plate 22 has eight adapter plate through holes 28, so the engagement plate 21 and the adapter plate 22 may be overlapped with a circumferential offset of 45°, for example. However, the angle of the circumferential offset is arbitrary.

[0022] As shown in FIG. 2, the first plate 30 faces the engagement structure 20 in the axial direction D. When the hoist sheave extraction jig 10 is set on the hoist sheave 3, the first plate 30 is disposed on the opposite side of the engagement structure 20 from the hoist 1, and is disposed at a position farther from the hoist 1 than the engagement structure 20. The first plate 30 is capable of coming into contact with the end face of the sheave shaft 2 and is capable of pressing against the end face of the sheave shaft 2. The first plate 30 may be formed in a circular shape.

[0023] The first plate 30 may be configured to be connectable to the sheave shaft 2. For example, the first plate 30 may include a shaft connecting bolt through-hole 31 (see FIG. 5 ) through which a shaft connecting bolt 71 that connects the sheave shaft 2 and the first plate 30 passes. As shown in FIG. 4 , an adapter 70 may be interposed between the first plate 30 and the sheave shaft 2. The adapter 70 may be connected to the sheave shaft 2 using a bolt or the like. The first plate 30 is connected to the adapter 70 using the shaft connecting bolt 71. The adapter 70 may have any configuration, and may be configured by stacking a plurality of plate-like members.

[0024] 5, the first plate 30 includes a plurality of hoisting machine side bolt through holes 32 through which the hoisting machine side bolts 50 pass. In the present embodiment, the first plate 30 includes four hoisting machine side bolt through holes 32. When viewed in the axial direction D, the four hoisting machine side bolt through holes 32 are arranged at 90° intervals.

[0025] The first plate 30 includes a plurality of first sheave side bolt through holes 33 through which the sheave side bolts 60 pass. In this embodiment, the first plate 30 includes eight first sheave side bolt through holes 33. When viewed in the axial direction D, the eight first sheave side bolt through holes 33 are arranged at 45° intervals.

[0026] Eyebolt screw holes 34 for attaching eyebolts 72 may be formed on the outer peripheral surface of the first plate 30. The eyebolts 72 may be used to lift up the first plate 30. The eyebolt screw holes 34 may be located at the top (or upper portion).

[0027] As shown in Fig. 6, the second plate 40 faces the first plate 30 in the axial direction D. The second plate 40 is disposed on the opposite side of the first plate 30 from the engagement structure 20. When the hoist sheave extraction jig 10 is set on the hoist sheave 3, the second plate 40 is disposed at a position farther from the hoist 1 than the first plate 30.

[0028] The second plate 40 includes second sheave side bolt through holes 41 through which the sheave side bolts 60 pass. In the present embodiment, the second plate 40 includes eight second sheave side bolt through holes 41. When viewed in the axial direction D, the eight second sheave side bolt through holes 41 are arranged at 45° intervals.

[0029] 2, one end of the hoisting machine side bolt 50 is attached to the hoisting machine 1, and the other end is attached to the first plate 30. The hoisting machine side bolt 50 extends in the axial direction D.

[0030] More specifically, the hoist-side bolt 50 may include a hoist-side end 51 arranged on the side of the hoist 1, and a first plate-side end 52 arranged on the opposite side of the hoist-side end 51. Male threads may be formed on the hoist-side end 51 and the first plate-side end 52. An intermediate portion between the hoist-side end 51 and the first plate-side end 52 may not be formed with a male thread, but may have a male thread.

[0031] The hoist-side end 51 is fastened to a screw hole (not shown) formed in the hoist 1. The screw hole of the hoist 1 is not particularly limited, but may be, for example, a screw hole for attaching an outer cover (not shown) of the hoist 1. The hoist-side bolt 50 may be fastened to the screw hole by removing the outer cover. The hoist-side end 51 is fastened to the screw hole of the hoist 1 using a nut N1, but a washer or the like may also be used in this case.

[0032] The first plate side end portion 52 passes through the above-mentioned hoist-machine side bolt through-hole 32 (see FIG. 5) of the first plate 30. The first plate side end portion 52 is fastened to nuts N2 arranged on both sides of the first plate 30. A washer or the like may or may not be interposed between the nuts N2 and the first plate 30.

[0033] 2, one end of the sheave-side bolt 60 is attached to the engagement structure 20, and the other end is attached to the second plate 40. The sheave-side bolt 60 extends in the axial direction D.

[0034] More specifically, the sheave-side bolt 60 may include a sheave-side end 61 arranged on the side of the hoist sheave 3, and a second plate-side end 62 arranged on the opposite side of the sheave-side end 61. Male threads may be formed on the sheave-side end 61 and the second plate-side end 62. An intermediate portion between the sheave-side end 61 and the second plate-side end 62 may not be formed with a male thread, but may be formed with a male thread.

[0035] The sheave-side end 61 passes through the multiple engagement plates 21 and the multiple adapter plates 22 that constitute the engagement structure 20. More specifically, the sheave-side end 61 passes through the engagement plate through-hole 25 of the engagement plate 21 (see FIG. 3(b)) and the adapter plate through-hole 28 of the adapter plate 22 (see FIG. 3(c)). The sheave-side end 61 is fastened to nuts N3 arranged on both sides of the engagement structure 20. In this way, the sheave-side end 61 is fixed to the engagement structure 20. A washer or the like may or may not be interposed between the nut N3 and the engagement structure 20.

[0036] A hoisting plate 73 may be attached to the sheave side end portions 61 of at least two sheave side bolts 60. In the hoisting plate 73 according to this embodiment, the hoisting plate 73 is attached to two sheave side end portions 61 adjacent to each other in the circumferential direction. The hoisting plate 73 is attached to the sheave side end portions 61 of the two sheave side bolts 60 arranged at the top. The hoisting plate 73 may be interposed between the engagement structure 20 and the nut N3. The sheave side end portions 61 may pass through a hole (not shown) in the hoisting plate 73. A hoisting hole 74 for hoisting the hoisting machine sheave 3 is formed in the hoisting plate 73.

[0037] The second plate side end portion 62 passes through the second sheave side bolt through-hole 41 (see FIG. 6) of the second plate 40. The second plate side end portion 62 is fastened to nuts N4 arranged on both sides of the second plate 40. In this way, the second plate side end portion 62 is fixed to the second plate 40. A washer or the like may or may not be interposed between the nut N4 and the second plate 40.

[0038] The sheave-side bolt 60 passes through the first plate 30. More specifically, an intermediate portion between the sheave-side end portion 61 and the second-plate-side end portion 62 passes through the first sheave-side bolt through-hole 33 of the first plate 30 (see FIG. 5).

[0039] Next, we will explain the hoisting machine sheave extraction method according to this embodiment, which uses the hoisting machine sheave extraction jig 10 configured as described above. The hoisting machine sheave extraction method is a method for extracting the hoisting machine sheave 3 from the sheave shaft 2 connected to the elevator hoisting machine 1.

[0040] The hoist sheave extraction method may include an engaging step, a bolt attaching step, a first plate attaching step, a second plate attaching step, a first extraction step, a first plate moving step, a second extraction step, and a jig removing step, and each step may be performed in this order.

[0041] First, in the engagement step, as shown in Fig. 4, the engagement structure 20 is engaged with the sheave groove 5 (see Fig. 3(a)) of the hoisting machine sheave 3. Each engagement plate 21 constituting the engagement structure 20 is engaged with the corresponding sheave groove 5 and overlapped.

[0042] More specifically, when viewed in the axial direction D, the first engagement plate member 23 is inserted into the sheave groove 5 from one side, and the second engagement plate member 24 is inserted into the sheave groove 5 from the other side. When viewed in the axial direction D, the first adapter plate member 26 is moved from one side toward the outer peripheral surface of the hoist machine sheave 3, and the second adapter plate member 27 is moved from the other side toward the outer peripheral surface of the hoist machine sheave 3. The engagement plates 21 and the adapter plates 22 are alternately overlapped so that the engagement plate through holes 25 (see Figure 3(b)) and the adapter plate through holes 28 (see Figure 3(c)) overlap.

[0043] Next, in the bolt installation step, a plurality of hoist side bolts 50 and a plurality of sheave side bolts 60 are installed as shown in FIG. 4. More specifically, the hoist side ends 51 of the hoist side bolts 50 extending in the axial direction D are installed to the hoist 1. In this case, the hoist side ends 51 of the hoist side bolts 50 are fastened to threaded holes (not shown) of the hoist 1 using nuts N1 or the like. In addition, the sheave side ends 61 of the sheave side bolts 60 extending in the axial direction D are installed to the engagement structure 20. In this case, the sheave side ends 61 pass through the engagement plate through-holes 25 and the adapter plate through-holes 28, and are fastened using nuts N3 or the like arranged on both sides of the engagement structure 20. A lifting device plate 73 may be installed to the sheave side ends 61 of the two sheave side bolts 60. A force in the lifting direction may be applied to the lifting tool plate 73 in a first extracting step, a first plate moving step, and a second extracting step, which will be described later.

[0044] 4, in the bolt attachment step, an adapter 70 may be attached to the end surface of the sheave shaft 2. The adapter 70 may be fastened to the end surface of the sheave shaft 2 with a bolt.

[0045] Next, in the first plate attaching step, as shown in Fig. 5 , the first plate 30 is attached to the first plate side end portions 52 of each hoisting machine side bolt 50. More specifically, the first plate side end portions 52 of the hoisting machine side bolts 50 pass through the hoisting machine side bolt through holes 32 of the first plate 30 and are fastened using nuts N2 or the like arranged on both sides of the first plate 30. Also, in the first plate attaching step, each sheave side bolt 60 is passed through the first plate 30. The sheave side bolts 60 pass through the first sheave side bolt through holes 33 of the first plate 30. The first plate 30 is arranged in a position farther from the hoisting machine 1 than the engagement structure 20.

[0046] In the first plate attaching step, the first plate 30 abuts against the sheave shaft 2. The first plate 30 may abut against the end face of the sheave shaft 2 via the above-mentioned adapter. In the present embodiment, the first plate 30 may be connected to the sheave shaft 2 via the adapter. In this case, the shaft connecting bolt 71 passes through the shaft connecting bolt through-hole 31 of the first plate 30 and is fastened to the adapter 70.

[0047] Next, in the second plate mounting step, as shown in Fig. 6, the second plate 40 is mounted to the second plate side end portions 62 of the sheave side bolts 60. More specifically, the second plate side end portions 62 of the sheave side bolts 60 pass through the second sheave side bolt through holes 41 of the second plate 40 and are fastened using nuts N4 or the like arranged on both sides of the second plate 40. The second plate 40 is arranged at a position farther from the hoisting machine 1 than the first plate 30.

[0048] Next, in the first withdrawal step, as shown in Figures 7 and 8, the second plate 40 is moved in a direction away from the hoisting machine 1, and the hoisting machine sheave 3 together with the engagement structure 20 is moved relative to the sheave shaft 2. As a result, the gap between the hoisting machine sheave 3 and the hoisting machine 1 may increase to δ shown in Figure 9. In the first withdrawal step, the first plate 30 presses against the sheave shaft 2 and does not move relative to the hoisting machine 1.

[0049] For example, the second plate 40 may be moved using a hydraulic jack 75. In this case, as shown in Fig. 7, the hydraulic jack 75 is attached between the second plate 40 and the first plate 30 to apply pressure to the second plate 40. This allows the second plate 40 to move in a direction away from the hoisting machine 1 relative to the first plate 30, as shown in Fig. 8.

[0050] The first plate 30 also receives pressure from the hydraulic jack 75. This allows the first plate 30 to press the end face of the sheave shaft 2 via the adapter 70. This makes it possible to prevent the sheave shaft 2 from moving while moving the second plate 40, as shown in FIG.

[0051] In the first withdrawal step, the hoist sheave 3 is not withdrawn from the sheave shaft 2. More specifically, the amount of movement of the second plate 40 corresponds to the amount of movement of the hoist sheave 3, and may be an amount of movement that does not cause the hoist sheave 3 to be withdrawn from the sheave shaft 2.

[0052] Next, in the first plate moving step, as shown in FIG. 9, the first plate 30 is moved in a direction away from the hoisting machine 1. In this case, first, the hydraulic jack 75 used in the first extraction step is removed. Next, the first plate 30 is removed from the hoisting machine-side bolts 50 by removing the nuts N2 and the like. The shaft connecting bolts 71 (see FIG. 5) described above are also removed from the first plate 30. Thereafter, the first plate 30 is moved so that it abuts against the second plate 40. The first plate 30 may be abutted against the nuts N4 that fasten the sheave-side bolts 60. The first plate 30 may be moved in a state where a force in a lifting direction is applied to the eye bolts 72 attached to the first plate 30.

[0053] Next, in the second withdrawal process, as shown in Figures 10 and 11, the first plate 30 and the second plate 40 are moved in a direction away from the hoisting machine 1, and the hoisting machine sheave 3 together with the engagement structure 20 is withdrawn from the sheave shaft 2.

[0054] For example, the first plate 30 and the second plate 40 may be moved using a hydraulic jack 75. In this case, as shown in FIG. 10, the hydraulic jack 75 is attached between the first plate 30 and the adapter 70 to apply pressure to the first plate 30. Meanwhile, the sheave shaft 2 also receives pressure from the hydraulic jack 75 via the adapter 70. This allows the first plate 30 and the second plate 40 to be moved in a direction away from the hoisting machine 1 relative to the sheave shaft 2, as shown in FIG. 11, and the hoisting machine sheave 3 can be pulled out from the sheave shaft 2. The hydraulic jack 75 is not shown in FIG. 11.

[0055] Next, in a jig removal process, the hoist sheave removal jig 10 is removed from the hoist 1 and the hoist sheave 3. More specifically, the second plate 40 is removed from the sheave-side bolts 60, and the first plate 30 is removed from the hoist-side bolts 50. The sheave-side bolts 60 are removed from the engagement structure 20, and the engagement structure 20 is removed from the hoist sheave 3. In addition, the hoist-side bolts 50 are removed from the hoist 1.

[0056] As described above, according to this embodiment, in the first extraction step, the second plate 40 is moved in a direction away from the hoisting machine 1, and the hoisting machine sheave 3 is moved together with the engagement structure 20 relative to the sheave shaft 2. In the first extraction step, the first plate 30 presses the sheave shaft 2. This makes it possible to prevent the sheave shaft 2 from moving relative to the hoisting machine 1 along with the hoisting machine sheave 3. As a result, damage to the hoisting machine 1 can be prevented.

[0057] Furthermore, according to this embodiment, in the first withdrawal step, the first plate 30 does not move relative to the hoisting machine 1. As a result, the first plate 30 can press the sheave shaft 2 so as not to move, and the sheave shaft 2 can be effectively prevented from moving relative to the hoisting machine 1.

[0058] Furthermore, according to this embodiment, in the first extraction step, the first plate 30 abuts against the sheave shaft 2 via the adapter 70. This allows the first plate 30 to press the sheave shaft 2 while avoiding interference with the nut N3 that fastens the sheave-side bolt 60 to the engagement structure 20. Furthermore, even when the hoist sheave 3 is moved in a direction away from the hoist 1 in the first extraction step, interference of the nut N3 with the first plate 30 can be avoided, and a movement allowance for the hoist sheave 3 can be secured.

[0059] Furthermore, according to this embodiment, the first plate 30 is connected to the sheave shaft 2. This prevents the first plate 30 from separating from the sheave shaft 2, and allows the first plate 30 to effectively press the sheave shaft 2.

[0060] Furthermore, according to this embodiment, the hoisting tool plates 73 are attached to the sheave-side ends 61 of at least two sheave-side bolts 60. This allows the hoisting machine sheave 3 to be lifted via the hoisting tool plates 73, or a force in the lifting direction to be applied to the hoisting tool. This improves the work efficiency when the hoisting machine sheave 3 is pulled out from the sheave shaft 2.

[0061] Moreover, according to this embodiment, the engagement structure 20 includes a plurality of engagement plates 21 that can engage with the sheave grooves 5 of the hoisting machine sheave 3. In the engagement process, each engagement plate 21 is engaged with the corresponding sheave groove 5 and overlapped. In the bolt installation process, the sheave-side end portion 61 of the sheave-side bolt 60 penetrates the plurality of engagement plates 21. This allows the engagement structure 20 to engage with the plurality of sheave grooves 5 of the hoisting machine sheave 3. Therefore, when the second plate 40 is moved in a direction away from the hoisting machine 1, a pulling force can be transmitted to the hoisting machine sheave 3 via the engagement structure 20. As a result, the hoisting machine sheave 3 can be effectively pulled out from the sheave shaft 2.

[0062] Furthermore, according to this embodiment, the engagement structure 20 includes an adapter plate 22 interposed between two adjacent engagement plates 21. This increases the rigidity of the engagement structure 20, which is made up of the engagement plates 21 and the adapter plate 22. Furthermore, the engagement plates 21 and the adapter plate 22 can be formed in flat plate shapes. This simplifies the structure of the engagement structure 20 and reduces manufacturing costs.

[0063] Furthermore, according to this embodiment, the engagement plate 21 includes, when viewed in the axial direction D, a first engagement plate member 23 inserted into the sheave groove 5 from one side, and a second engagement plate member 24 inserted into the sheave groove 5 from the other side. This allows the engagement plate 21 to engage with the sheave groove 5 over the entire circumference of the sheave groove 5. Therefore, when the second plate 40 is moved in a direction away from the hoisting machine 1, a pulling force can be transmitted to the hoisting machine sheave 3 via the engagement structure 20. As a result, the hoisting machine sheave 3 can be effectively pulled out from the sheave shaft 2.

[0064] According to the embodiment described above, damage to the hoisting machine 1 can be prevented.

[0065] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0066] 1: hoist, 2: sheave shaft, 3: hoist sheave, 5: sheave groove, 10: hoist sheave extraction jig, 20: engagement structure, 21: engagement plate, 22: adapter plate, 23: first engagement plate member, 24: second engagement plate member, 30: first plate, 40: second plate, 50: hoist side bolt, 51: hoist side end, 52: first plate side end, 60: sheave side bolt, 61: sheave side end, 62: second plate side end, 70: adapter, 73: lifting tool plate, D: axial direction

Claims

1. A hoist sheave extraction method for extracting a hoist sheave from a sheave shaft connected to an elevator hoist, an engaging step of engaging an engaging structure with a sheave groove of the hoisting machine sheave; a bolt attaching step of attaching one end of a plurality of hoist-side bolts, each extending in the axial direction of the sheave shaft, to the hoist and attaching one end of a plurality of sheave-side bolts, each extending in the axial direction, to the engagement structure; a first plate attaching step of attaching a first plate to the other end of each of the hoist-side bolts and passing each of the sheave-side bolts through the first plate; a second plate attaching step of attaching a second plate to the other end of each of the sheave-side bolts, the second plate being disposed at a position farther from the hoist than the first plate; a first extraction step of moving the second plate in a direction away from the hoist to move the hoist sheave together with the engagement structure relative to the sheave shaft; a first plate moving step of moving the first plate in a direction away from the hoist; a second withdrawal step of moving the first plate and the second plate in a direction away from the hoist to withdraw the hoist sheave together with the engagement structure from the sheave shaft; Equipped with In the first drawing step, the first plate presses the sheave shaft. A method for extracting an elevator hoisting machine sheave.

2. In the first pulling-out process, the first plate does not move relative to the hoist. The method for extracting an elevator hoist sheave according to claim 1.

3. In the first plate attaching step, the first plate presses the sheave shaft via an adapter.

3. The method for extracting an elevator hoist sheave according to claim 1 or 2.

4. In the first plate attaching step, the first plate is connected to the sheave shaft.

3. The method for extracting an elevator hoist sheave according to claim 1 or 2.

5. In the bolt attaching step, a lifting tool plate is attached to the one end of at least two of the sheave-side bolts.

3. The method for extracting an elevator hoist sheave according to claim 1 or 2.

6. the engagement structure includes a plurality of engagement plates engageable with the corresponding sheave grooves of the hoist sheave, In the engaging step, each of the engaging plates is engaged with the corresponding sheave groove and overlapped with each other; In the bolt attaching step, the one end of the sheave-side bolt penetrates the plurality of engagement plates.

3. The method for extracting an elevator hoist sheave according to claim 1 or 2.

7. The engagement structure includes an adapter plate interposed between two adjacent engagement plates, The one end of the sheave-side bolt penetrates the plurality of engagement plates and the adapter plate. The method for extracting an elevator hoisting machine sheave according to claim 6.

8. When viewed in the axial direction of the sheave shaft, the engagement plate includes a first engagement plate member inserted into the sheave groove from one side and a second engagement plate member inserted into the sheave groove from the other side. The method for extracting an elevator hoisting machine sheave according to claim 6.

9. A hoist sheave extraction jig for extracting a hoist sheave from a sheave shaft connected to an elevator hoist, an engagement structure that engages with the sheave groove of the hoisting machine sheave; a first plate facing the engagement structure and capable of pressing the sheave shaft; a second plate facing the first plate and disposed on an opposite side of the first plate from the engagement structure; a plurality of hoist-side bolts, one end of which is attached to the hoist and the other end of which is attached to the first plate; a plurality of sheave-side bolts, one end of which is attached to the engagement structure and the other end of which is attached to the second plate, the plurality of sheave-side bolts penetrating the first plate; An elevator hoisting machine sheave extraction jig equipped with the above.

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