Method for removing elevator hoisting machine sheaves and hoisting machine sheave removal jig

Abstract

This invention provides a method for removing elevator hoist sheaves that can prevent damage to the hoisting machine. [Solution] In the first plate mounting step of the elevator hoisting machine sheave extraction method according to the embodiment, the first plate is attached to the hoisting machine via hoisting machine side bolts. In the second plate mounting step, the second plate is attached to an engagement structure that engages with the sheave groove of the hoisting machine sheave via sheave side bolts. The second plate is positioned further away from the hoisting machine than the first plate. In the first extraction step, the second plate is moved away from the hoisting machine to move the hoisting machine sheave relative to the sheave shaft. In the first extraction step, the first plate is pressing against the sheave shaft.

Description

Technical Field

[0001] The embodiments relate to a method for pulling out a hoist sheave of an elevator and a hoist sheave pulling tool.

Background Art

[0002] A hoist sheave is connected to the hoist of an elevator. When replacing the hoist sheave, a dedicated tool is used to pull out the hoist sheave from the sheave shaft connected to the shaft of the hoist.

[0003] However, there is a problem that at the moment when the hoist sheave comes off the sheave shaft, the sheave shaft is pulled along by the hoist sheave and moves. In this case, the hoist may be damaged.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the embodiments is to provide a method for pulling out a hoist sheave of an elevator and a hoist sheave pulling tool that can prevent damage to the hoist.

[0006] The embodiment is a method for removing a hoisting machine sheave from a sheave shaft connected to an elevator hoisting machine. The hoisting machine sheave removal method includes an engagement step of engaging an engagement structure with the sheave groove of the hoisting machine sheave; a bolt attachment step of attaching one end of a plurality of hoisting machine side bolts, each extending in the axial direction of the sheave shaft, to the hoisting machine, and attaching one end of a plurality of sheave side bolts, each extending in the axial direction, to the engagement structure; a first plate attachment step of attaching a first plate to the other end of each hoisting machine side bolt and passing each sheave side bolt through the first plate; and attaching a first plate to the other end of each sheave side bolt. The system includes a second plate mounting step of mounting a second plate positioned further away from the hoisting machine than the plate; a first withdrawal step of moving the second plate away from the hoisting machine and moving the hoisting machine sheave together with the engagement structure relative to the sheave shaft; a first plate moving step of moving the first plate away from the hoisting machine; and a second withdrawal step of moving the first plate and the second plate away from the hoisting machine and withdrawing the hoisting machine sheave together with the engagement structure from the sheave shaft. In the first withdrawal step, the first plate presses against the sheave shaft.

[0007] The embodiment is a hoisting machine sheave extraction jig for extracting a hoisting machine sheave from a sheave shaft connected to an elevator hoisting machine. The hoisting machine sheave extraction jig comprises 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 positioned on the opposite side of the engagement structure from the first plate; a plurality of hoisting machine side bolts, one end of which is attached to the hoisting machine and the other end of which is attached to the first plate; and 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, and which penetrate the first plate. [Brief explanation of the drawing]

[0008] [Figure 1]Figure 1 is a perspective view showing a hoisting machine sheave connected to an elevator hoisting machine. [Figure 2] Figure 2 is a perspective view showing an elevator hoisting machine sheave extraction jig according to an embodiment. [Figure 3] Figure 3(a) is a partial cross-sectional view showing the engagement structure shown in Figure 2, Figure 3(b) is a plan view showing the engagement plate, and Figure 3(c) is a plan view showing the adapter plate. [Figure 4] Figure 4 is a perspective view illustrating the engagement process and the bolt installation process in an elevator hoisting machine sheave extraction method according to an embodiment. [Figure 5] Figure 5 is a perspective view illustrating the first plate mounting step in the elevator hoisting machine sheave extraction method according to an embodiment. [Figure 6] Figure 6 is a perspective view illustrating the second plate installation step in the elevator hoisting machine sheave extraction method according to an embodiment. [Figure 7] Figure 7 is a side view illustrating the first extraction step in the elevator hoisting machine sheave extraction method according to an embodiment. [Figure 8] Figure 8, following Figure 7, is a side view illustrating the first drawing process. [Figure 9] Figure 9 is a side view illustrating the first plate movement step in the elevator hoisting machine sheave extraction method according to an embodiment. [Figure 10] Figure 10 is a side view illustrating the second extraction step in the elevator hoisting machine sheave extraction method according to an embodiment. [Figure 11] Figure 11, following Figure 10, is a perspective view illustrating the second drawing process. [Modes for carrying out the invention]

[0009] The following describes an elevator hoisting machine sheave extraction jig and hoisting machine sheave extraction method according to an embodiment, with reference to the drawings. First, the hoisting machine and hoisting machine sheave will be described using Figure 1.

[0010] As shown in Figure 1, a sheave shaft 2 is connected to the hoisting machine 1. The sheave shaft 2 may be integrally formed with the 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 in sync with the sheave shaft 2.

[0011] Multiple sheave grooves 5 are formed on the outer surface of the hoisting machine sheave 3. A main rope (not shown) is wound around the sheave grooves 5. When the hoisting machine 1 is driven, the hoisting machine sheave 3 rotates and the main rope is wound up. As a result, the elevator car and counterweight (not shown) move up and down within the elevator shaft.

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

[0013] As shown in Figure 2, the hoisting machine sheave extraction jig 10 includes an engagement structure 20, a first plate 30, a second plate 40, a plurality of hoisting machine 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 hoisting machine 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 adapter plates 22 may be stacked alternately.

[0015] Each engagement plate 21 is configured to be engaged 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 substantially over 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. The first engagement plate member 23 is inserted into the sheave groove 5 from one side when viewed in the axial direction D of the sheave shaft 2, 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 the upper side, and the second engagement plate member 24 is inserted into the sheave groove 5 from the lower side. The first engagement plate member 23 and the second engagement plate member 24 may each be formed in a semi-circular ring shape. The first engagement plate member 23 and the second engagement plate member 24 may be arranged at positions shifted from each other by 180° when viewed in the axial direction D. A circular ring-shaped engagement plate 21 may be formed by combining the first engagement plate member 23 and the second engagement plate member 24.

[0017] Engagement plate through holes 25 through which the 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 an equal angular pitch 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 and faces a portion between two adjacent sheave grooves 5 on the outer peripheral surface of the hoisting machine sheave 3. 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 shifted from each other by 180° when viewed in the axial direction D. 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 hoisting machine sheave 3, and the second adapter plate member 27 is moved from the other side toward the outer peripheral surface of the hoisting machine sheave 3. A circular ring-shaped adapter plate 22 may be formed by combining the first adapter plate member 26 and the second adapter plate member 27.

[0020] As shown in Figs. 3(b) and 3(c), adapter plate through holes 28 through which the sheave side bolts 60 penetrate are formed in the first adapter plate member 26 and the second adapter plate member 27. A plurality of adapter plate through holes 28 are formed in each of the first adapter plate member 26 and the second adapter plate member 27. The adapter plate through holes 28 are arranged at an equal angular pitch 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, since the engagement plate 21 has eight engagement plate through holes 25 and the adapter plate 22 has eight adapter plate through holes 28, for example, the engagement plate 21 and the adapter plate 22 may be overlapped with a circumferential offset of 45° each. However, the angle of the circumferential offset is arbitrary.

[0022] As shown in Figure 2, the first plate 30 faces the engagement structure 20 in the axial direction D. When the hoisting machine sheave extraction jig 10 is set on the hoisting machine sheave 3, the first plate 30 is positioned on the opposite side of the engagement structure 20 from the hoisting machine 1, and is located further away from the hoisting machine 1 than the engagement structure 20. The first plate 30 is capable of contacting the end face of the sheave shaft 2 and 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 Figure 5) through which a shaft connecting bolt 71 connecting the sheave shaft 2 and the first plate 30 passes. An adapter 70 may be interposed between the first plate 30 and the sheave shaft 2, as shown in Figure 4. The adapter 70 may be connected to the sheave shaft 2 using bolts or the like. The first plate 30 is connected to the adapter 70 using the shaft connecting bolt 71. The configuration of the adapter 70 is arbitrary, but it may be constructed by stacking multiple plate-shaped members.

[0024] As shown in Figure 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 this 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 a 90° pitch.

[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 a 45° pitch.

[0026] An eyebolt screw hole 34 for attaching an eyebolt 72 may be formed on the outer circumferential surface of the first plate 30. The eyebolt 72 may be used to lift the first plate 30. The eyebolt screw hole 34 may be located at the top (or upper part).

[0027] As shown in Figure 6, the second plate 40 faces the first plate 30 in the axial direction D. The second plate 40 is positioned on the opposite side of the engagement structure 20 from the first plate 30. When the hoisting machine sheave extraction jig 10 is set on the hoisting machine sheave 3, the second plate 40 is positioned further away from the hoisting machine 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 this 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 a 45° pitch.

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

[0030] More specifically, the hoisting machine side bolt 50 may include a hoisting machine side end 51 located on the side of the hoisting machine 1, and a first plate side end 52 located on the opposite side from the hoisting machine side end 51. Male threads may be formed on the hoisting machine side end 51 and the first plate side end 52. Male threads may or may not be formed in the intermediate portion between the hoisting machine side end 51 and the first plate side end 52.

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

[0032] The first plate side end 52 passes through the hoisting machine side bolt through hole 32 (see Figure 5) of the first plate 30. The first plate side end 52 is fastened to nuts N2 located on both sides of the first plate 30. Washers or the like may or may not be interposed between the nuts N2 and the first plate 30.

[0033] As shown in Figure 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 located on the side of the hoisting machine sheave 3 and a second plate-side end 62 located 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. Male threads may or may not be formed in the intermediate portion between the sheave-side end 61 and the second plate-side end 62.

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

[0036] Lifting plates 73 may be attached to the sheave-side ends 61 of at least two sheave-side bolts 60. In this embodiment, the lifting plates 73 are attached to two circumferentially adjacent sheave-side ends 61. The lifting plates 73 are attached to the sheave-side ends 61 of two sheave-side bolts 60 located at the top. The lifting plates 73 may be interposed between the engagement structure 20 and the nut N3. The sheave-side ends 61 may pass through holes (not shown) in the lifting plates 73. The lifting plates 73 have lifting holes 74 formed therein for lifting the hoisting machine sheave 3.

[0037] The second plate end portion 62 passes through the second sheave-side bolt through-hole 41 (see Figure 6) of the second plate 40. The second plate end portion 62 is fastened to nuts N4 located on both sides of the second plate 40. In this way, the second plate 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, the intermediate portion between the sheave-side end 61 and the second plate-side end 62 passes through the first sheave-side bolt through-hole 33 (see Figure 5) of the first plate 30.

[0039] Next, a method for extracting a hoisting machine sheave according to this embodiment, using the hoisting machine sheave extraction jig 10 configured in this way, will be described. The hoisting machine sheave extraction method is a method for extracting a hoisting machine sheave 3 from a sheave shaft 2 connected to an elevator hoisting machine 1.

[0040] The hoisting machine sheave extraction method may include an engagement step, a bolt installation step, a first plate installation step, a second plate installation step, a first extraction step, a first plate movement step, a second extraction step, and a jig removal step. Each step may be performed in this order.

[0041] First, in the engagement process, as shown in Figure 4, the engagement structure 20 is engaged with the sheave groove 5 of the hoisting machine sheave 3 (see Figure 3(a)). Each engagement plate 21 constituting the engagement structure 20 is engaged with the corresponding sheave groove 5 and is also superimposed on it.

[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 circumferential surface of the hoisting machine sheave 3, and the second adapter plate member 27 is moved from the other side toward the outer circumferential surface of the hoisting machine sheave 3. The engagement plate 21 and the adapter plate 22 are alternately overlapped such that the engagement plate through hole 25 (see Figure 3(b)) and the adapter plate through hole 28 (see Figure 3(c)) overlap.

[0043] Next, in the bolt installation process, as shown in Figure 4, multiple hoisting machine side bolts 50 and multiple sheave side bolts 60 are installed. More specifically, the hoisting machine side end 51 of the hoisting machine side bolt 50 extending in the axial direction D is attached to the hoisting machine 1. In this case, the hoisting machine side end 51 of the hoisting machine side bolt 50 is fastened to a screw hole (not shown) of the hoisting machine 1 using a nut N1 or the like. Also, the sheave side end 61 of the sheave side bolt 60 extending in the axial direction D is attached to the engagement structure 20. In this case, the sheave side end 61 passes through the engagement plate through hole 25 and the adapter plate through hole 28 and is fastened using a nut N3 or the like placed on both sides of the engagement structure 20. Lifting device plates 73 may be attached to the sheave side ends 61 of the two sheave side bolts 60. The lifting plate 73 may be subjected to an upward force during the first extraction process, the first plate movement process, and the second extraction process, which will be described later.

[0044] In the bolt installation process, as shown in Figure 4, the adapter 70 may be attached to the end face of the sheave shaft 2. The adapter 70 may be bolted to the end face of the sheave shaft 2.

[0045] Next, in the first plate mounting process, as shown in Figure 5, the first plate 30 is attached to the first plate end 52 of each hoisting machine side bolt 50. More specifically, the first plate side end 52 of the hoisting machine side bolt 50 passes through the hoisting machine side bolt through hole 32 of the first plate 30 and is fastened using nuts N2 or the like which are placed on both sides of the first plate 30. Also in the first plate mounting process, each sheave side bolt 60 is passed through the first plate 30. The sheave side bolt 60 passes through the first sheave side bolt through hole 33 of the first plate 30. The first plate 30 is positioned further away from the hoisting machine 1 than the engagement structure 20.

[0046] In the first plate mounting 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 adapter described above. In this 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 process, as shown in Figure 6, the second plate 40 is attached to the second plate end 62 of each sheave-side bolt 60. More specifically, the second plate end 62 of the sheave-side bolt 60 passes through the second sheave-side bolt through hole 41 of the second plate 40 and is fastened using nuts N4 or the like which are placed on both sides of the second plate 40. The second plate 40 is positioned further away 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 away from the hoisting machine 1, and the hoisting machine sheave 3 is moved relative to the sheave shaft 2 together with the engaging structure 20. As a result, the gap between the hoisting machine sheave 3 and the hoisting machine 1 may increase to δ as shown in Figure 9. In the first withdrawal step, the first plate 30 is pressing 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 Figure 7, the hydraulic jack 75 is installed between the second plate 40 and the first plate 30 to pressurize the second plate 40. This allows the second plate 40 to be moved away from the hoisting machine 1 relative to the first plate 30, as shown in Figure 8.

[0050] The first plate 30 also receives pressure from the hydraulic jack 75. As a result, the first plate 30 can press against 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 Figure 8.

[0051] In the first withdrawal process, the hoisting machine 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 hoisting machine sheave 3, and may be an amount of movement such that the hoisting machine sheave 3 is not withdrawn from the sheave shaft 2.

[0052] Next, in the first plate moving step, as shown in Figure 9, the first plate 30 is moved away from the hoisting machine 1. In this case, first, the hydraulic jack 75 used in the first withdrawal step is removed. Subsequently, the first plate 30 is removed from the hoisting machine side bolt 50 by removing the nut N2, etc. Also, the shaft connecting bolt 71 (see Figure 5) mentioned above is removed from the first plate 30. After that, the first plate 30 is moved to come into contact with the second plate 40. The first plate 30 may also come into contact with the nut N4 that fastens the sheave side bolt 60. The first plate 30 may be moved while an upward force is applied to the eye bolt 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 away from the hoisting machine 1, and the hoisting machine sheave 3 is withdrawn from the sheave shaft 2 together with the engaging structure 20.

[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 Figure 10, the hydraulic jack 75 is installed between the first plate 30 and the adapter 70 to pressurize the first plate 30. Meanwhile, the sheave shaft 2 also receives pressure from the hydraulic jack 75 via the adapter 70. As a result, as shown in Figure 11, the first plate 30 and the second plate 40 can be moved away from the hoisting machine 1 relative to the sheave shaft 2, and the hoisting machine sheave 3 can be pulled out from the sheave shaft 2. In Figure 11, the hydraulic jack 75 is not shown.

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

[0056] As described above, according to this embodiment, in the first withdrawal step, the second plate 40 is moved away from the hoisting machine 1, and together with the engaging structure 20, the hoisting machine sheave 3 is moved relative to the sheave shaft 2. In the first withdrawal step, the first plate 30 is pressing against the sheave shaft 2. This prevents the sheave shaft 2 from being pulled along with the hoisting machine sheave 3 and moving relative to the hoisting machine 1. Therefore, damage to the hoisting machine 1 can be prevented.

[0057] Furthermore, according to this embodiment, in the first extraction process, the first plate 30 does not move relative to the hoisting machine 1. As a result, the first plate 30 can press against the sheave shaft 2 to prevent it from moving, and effectively prevent the sheave shaft 2 from moving relative to the hoisting machine 1.

[0058] Furthermore, according to this embodiment, in the first extraction step, the first plate 30 is in contact with the sheave shaft 2 via the adapter 70. This allows the first plate 30 to press against the sheave shaft 2 while avoiding interference with the nut N3 that fastens the sheave-side bolt 60 to the engagement structure 20. Also, even if the hoisting machine sheave 3 is moved away from the hoisting machine 1 in the first extraction step, interference between the nut N3 and the first plate 30 can be avoided, and the movement range of the hoisting machine 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 the first plate 30 can effectively press against the sheave shaft 2.

[0060] Furthermore, according to this embodiment, lifting 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 lifting plates 73, or a force in the lifting direction to be applied to the lifting device. Therefore, the work efficiency when pulling the hoisting machine sheave 3 from the sheave shaft 2 can be improved.

[0061] Furthermore, 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 61 of the sheave-side bolt 60 passes through the plurality of engagement plates 21. As a result, the engagement structure 20 can engage with the plurality of sheave grooves 5 of the hoisting machine sheave 3. Therefore, when the second plate 40 is moved away from the hoisting machine 1, the 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 composed of the engagement plates 21 and the adapter plate 22. In addition, the engagement plates 21 and the adapter plate 22 can be formed in a flat plate shape. Therefore, the structure of the engagement structure 20 can be simplified and manufacturing costs can be reduced.

[0063] Furthermore, according to this embodiment, the engagement plate 21 includes 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 when viewed in the axial direction D. This allows the engagement plate 21 to be engaged with the sheave groove 5 around its entire circumference. Therefore, when the second plate 40 is moved away from the hoisting machine 1, the 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 embodiments described above, damage to the hoisting machine 1 can be prevented.

[0065] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents. [Explanation of symbols]

[0066] 1: Hoisting machine, 2: Sheave shaft, 3: Hoisting machine sheave, 5: Sheave groove, 10: Hoisting machine sheave extraction jig, 20: Engaging structure, 21: Engaging plate, 22: Adapter plate, 23: First engaging plate member, 24: Second engaging plate member, 30: First plate, 40: Second plate, 50: Hoisting machine side bolt, 51: Hoisting machine side end, 52: First plate side end, 60: Sheave side bolt, 61: Sheave side end, 62: Second plate side end, 70: Adapter, 73: Lifting device plate, D: Axial direction

Claims

1. A method for removing a hoisting machine sheave from a sheave shaft connected to an elevator hoisting machine, The engagement step involves engaging the engagement structure with the sheave groove of the hoisting machine sheave, A bolt mounting step in which one end of each of the multiple hoisting machine side bolts extending in the axial direction of the sheave shaft is attached to the hoisting machine, and one end of each of the multiple sheave side bolts extending in the axial direction is attached to the engagement structure, A first plate mounting step involves attaching a first plate to the other end of each of the hoisting machine side bolts and passing each of the sheave side bolts through the first plate, A second plate mounting step involves attaching a second plate, which is positioned further away from the hoisting machine than the first plate, to the other end of each of the sheave-side bolts. A first withdrawal step involves moving the second plate away from the hoisting machine, thereby moving the hoisting machine sheave together with the engagement structure relative to the sheave shaft, A first plate moving step involves moving the first plate in a direction away from the hoisting machine, A second withdrawal step involves moving the first plate and the second plate away from the hoisting machine, thereby withdrawing the hoisting machine sheave from the sheave shaft together with the engagement structure, Equipped with, In the first extraction step, the first plate presses against the sheave shaft. Method for removing the sheave from an elevator hoisting machine.

2. In the first extraction step, the first plate does not move relative to the hoisting machine. A method for extracting an elevator hoist sheave according to claim 1.

3. In the first plate mounting step, the first plate presses against the sheave shaft via an adapter. A method for extracting an elevator hoist sheave according to claim 1 or 2.

4. In the first plate mounting step, the first plate is connected to the sheave shaft. A method for extracting an elevator hoist sheave according to claim 1 or 2.

5. In the bolt installation process, attach the lifting plate to one end of at least two of the sheave-side bolts. A method for extracting an elevator hoist sheave according to claim 1 or 2.

6. The engagement structure includes a plurality of engagement plates that can engage with the corresponding sheave grooves of the hoisting machine sheave, In the engagement step, each of the engagement plates is engaged with the corresponding sheave groove and superimposed. In the bolt installation process, one end of the sheave-side bolt penetrates the plurality of engagement plates. A 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 hoist sheave according to claim 6.

8. The engagement plate includes, when viewed in the axial direction of the sheave shaft, 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 hoist sheave according to claim 6.

9. A hoisting machine sheave extraction tool for extracting a hoisting machine sheave from a sheave shaft connected to an elevator hoisting machine, An engaging structure that engages with the sheave groove of the hoisting machine sheave, A first plate facing the engagement structure, the first plate capable of pressing the sheave shaft, A second plate facing the first plate, the second plate being positioned on the opposite side of the first plate from the engagement structure, A plurality of hoisting machine side bolts, one end of which is attached to the hoisting machine 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, wherein a plurality of sheave-side bolts pass through the first plate, An elevator hoisting machine sheave extraction jig equipped with [a specific feature].

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