Elevator balance weight sheave replacement jig and balance weight sheave replacement method

Abstract

To provide a jig for replacing a balancing weight sheave of an elevator, which can eliminate the need to install a suspension point in a hoistway and can easily replace the balancing weight sheave. [Solution] In one embodiment, a pair of first arms of an elevator counterweight device are rotatable from a first closed position in which the first sheave is located in a space between main ropes extending upward from a counterweight sheave and the first sheave abuts the main ropes from the inside to a first open position in which the main ropes are spread apart. The rope separating mechanism is configured to move the main ropes downward and separate them from the counterweight sheaves when the first arms are in the first open position. The rope holding mechanism is configured to hold the main ropes separated from the counterweight sheaves.

Description

[Technical Field]

[0001] The embodiments relate to an elevator balancing weight sheave replacement jig and a balancing weight sheave replacement method. [Background technology]

[0002] An elevator system is known in which a car and a counterweight are connected via a main rope, and the car is raised and lowered by winding up the main rope. The main rope may be wound around a car sheave attached to the car and also around a counterweight sheave attached to the counterweight.

[0003] When replacing the balance weight sheave, the car is positioned at the same height as the balance weight, and work is performed from the car's ceiling. In this case, a lifting machine is hung from a lifting point installed at the top of the hoistway or on the connecting plate of the guide rail, and the car and the balance weight's weight support frame are lifted. This releases tension from the main rope, allowing the balance weight sheave to be replaced.

[0004] However, in this type of replacement work, if the height position of the counterweight during the replacement work is far from the lifting machine, it is possible that the work will be affected by the expansion and contraction of the lifting rope, which may reduce workability. In addition, there is the problem that it takes time to install the suspension point on the connecting plate of the guide rail, and further, depending on the position of the connecting plate, there is the problem that the lifting rope may interfere with other equipment in the hoistway. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-51733 Summary of the Invention [Problem to be solved by the invention]

[0006] The present embodiment aims to provide an elevator balancing weight sheave replacement jig and balancing weight sheave replacement method that eliminates the need to install a suspension point in the elevator shaft and allows for easy replacement of the balancing weight sheave. [Means for solving the problem]

[0007] An elevator counterweight sheave replacement jig according to an embodiment is a jig for replacing a counterweight sheave around which a main rope is wound, and is removably attached to a counterweight support device including a counterweight support frame constituting the elevator counterweight and a counterweight sheave support frame attached to the counterweight support frame and supporting a counterweight sheave. The counterweight sheave replacement jig includes a pair of first arms rotatable about first fulcrums on the counterweight sheave support frame, a pair of first sheaves rotatably attached to the tip ends of the corresponding first arms, a first drive unit that rotates the pair of first arms, a rope separating mechanism, and a rope holding mechanism. The pair of first arms are rotatable from a first closed position in which the first sheaves are located in the space between the main ropes extending upward from the counterweight sheaves and the first sheaves abut against the main ropes from the inside to a first open position in which the main ropes are spread apart by driving the first drive unit. The rope separating mechanism is configured to move the main rope downward and away from the counterweight sheave when the first arm is in the first open position, and the rope holding mechanism is configured to hold the main rope spaced away from the counterweight sheave.

[0008] An elevator counterweight sheave replacement method according to an embodiment is a method for replacing a counterweight sheave, which is supported by a counterweight sheave support frame attached to a counterweight support frame that constitutes an elevator counterweight, and on which a main rope is wound. The counterweight sheave replacement method includes the steps of: attaching a pair of first arms to the counterweight sheave support frame so that they can rotate about first supports, and attaching a pair of first sheaves to tip ends of the corresponding first arms so that they can rotate; rotating the pair of first arms from a first closed position, in which the first sheaves are located in spaces between the main ropes extending upward from the counterweight sheaves and abut against the main ropes from the inside, to a first open position to spread the main ropes apart; moving the main ropes downward while the first arms are in the first open position to separate them from the counterweight sheave; holding the main ropes separated from the counterweight sheave; and replacing the counterweight sheave while holding the main ropes. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing an elevator apparatus according to a first embodiment. [Figure 2] FIG. 2 is a front view showing the counterweight shown in FIG. [Figure 3] FIG. 3 is a front perspective view showing the balancing weight sheave replacing jig according to the first embodiment. [Figure 4] FIG. 4 is a schematic diagram showing a state in which the first sheave is positioned at the first closed position in the method for replacing the balance weight sheave according to the present embodiment. [Figure 5] FIG. 5 is a schematic diagram illustrating a state in which the first arm is positioned at the first open position, following FIG. [Figure 6] FIG. 6 is a schematic diagram showing a state in which the second sheave is positioned at the second closed position, following FIG. [Figure 7] FIG. 7 is a schematic diagram showing a state in which the second arm is positioned at the second open position, following FIG. [Figure 8] FIG. 8 is a schematic diagram showing a state in which the third arm is installed, following FIG. [Figure 9] FIG. 9 is a schematic diagram showing a state in which the first arm and the first sheave are removed, following FIG. [Figure 10] FIG. 10 is a schematic diagram showing a state in which the second arm and the second sheave are removed, following FIG. [Figure 11] FIG. 11 is a schematic diagram showing a modification of the balancing weight sheave replacing jig shown in FIG. [Figure 12] FIG. 12 is a schematic diagram showing the fourth arm in an extended state in the balancing weight sheave replacing jig according to the second embodiment. [Figure 13] FIG. 13 is a schematic diagram showing the fourth arm in a contracted state. [Figure 14] FIG. 14 is a schematic diagram showing a balancing weight sheave replacing jig according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] (First embodiment) Hereinafter, an elevator balancing weight sheave replacement jig and a balancing weight sheave replacement method according to this embodiment will be described with reference to the drawings. First, an elevator apparatus according to this embodiment will be described.

[0011] As shown in FIG. 1, an elevator apparatus 1 includes a car 3 and a counterweight 4 disposed in a hoistway 2. The car 3 and the counterweight 4 are connected via a main rope 5. The main rope 5 is wound around a traction sheave 6a and a camber sheave 7 provided on a hoisting machine 6. The main rope 5 is wound around a car sheave 8 provided on the car 3, and is also wound around a counterweight sheave 9 provided on the counterweight 4. The hoisting machine 6 winds up the main rope 5, causing the car 3 and the counterweight 4 to rise and fall. The hoisting machine 6 is installed in a machine room 10 provided above the hoistway 2. A control panel 11 is installed in the machine room 10. The control panel 11 is a device that controls the entire elevator apparatus 1, including the hoisting machine 6. For example, the control panel 11 controls the operation of the hoisting machine 6 in response to hall calls and car calls, and makes the car 3 land at the hall of the floor for which the call is registered.

[0012] The elevator system 1 is not limited to the configuration shown in Fig. 1. For example, it may be a so-called machine room-less elevator system. In other words, the machine room 10 may not be provided, and the hoisting machine 6 and the control panel 11 may be provided above the hoistway 2, etc.

[0013] 2, the counterweight 4 includes a counterweight support device 12, a plurality of counterweights 13, and a counterweight holder 14. The counterweight support device 12 includes a counterweight support frame 15 and a counterweight sheave support frame 16.

[0014] The weight support frame 15 is formed in a rectangular frame shape and is configured to support a plurality of weights 13. A guide portion (not shown) such as a guide roller is attached to the weight support frame 15, and the counterweight 4 can be raised and lowered along a weight guide rail (not shown) installed in the hoistway 2. The weight support frame 15 includes a lower beam 15a, a pair of vertical beams 15b, and an upper beam 15c. A plurality of weights 13 are stacked and supported by the lower beam 15a. The plurality of weights 13 are held down by a weight holder 14 attached to the vertical beam 15b.

[0015] The weight sheave support frame 16 is attached to the upper beam 15c of the weight support frame 15. The weight sheave support frame 16 extends upward from the upper beam 15c. A counterweight sheave 9 is rotatably supported by the weight sheave support frame 16. The weight sheave support frame 16 includes two plate-shaped members spaced apart in the front-to-rear direction, and the counterweight sheave 9 is disposed between these members. In this embodiment, one counterweight sheave 9 is attached to the counterweight 4.

[0016] In the following description, the left-right direction of the counterweight 4 shown in Fig. 2 is referred to as the lateral direction, and the direction perpendicular to the plane of the paper in Fig. 2 is referred to as the front-rear direction. The up-down direction in Fig. 2 is the direction perpendicular to the lateral direction and the front-rear direction.

[0017] Next, an elevator balancing weight sheave replacement jig according to this embodiment (hereinafter simply referred to as balancing weight sheave replacement jig 20) will be described. The balancing weight sheave replacement jig 20 is removably attached to the counterweight support device 12. The balancing weight sheave replacement jig 20 is a jig for replacing the balancing weight sheave 9 around which the main rope 5 is wound.

[0018] The balance weight sheave replacing jig 20 includes a pair of first arms 21, a pair of first sheaves 22, a first drive unit 23 (see FIG. 4), a rope separating mechanism 30, and a rope holding mechanism 40.

[0019] The first arm 21 is rotatable about a first fulcrum 21o on the weight sheave support frame 16. The first arm 21 is attached to the weight sheave support frame 16 via a first bearing member 24. As shown in FIG. 4, the first fulcrum 21o is located on a central axis CL that passes through the rotation center 9o of the balance weight sheave 9 and extends in the up-down direction when viewed in the front-to-rear direction. In this embodiment, the first fulcrum 21o is located above the rotation center of the balance weight sheave.

[0020] As shown in Fig. 3, each first arm 21 includes a pair of first arm members 21a. The pair of first arm members 21a are arranged on both sides of the weight sheave support frame 16 in the front-rear direction and are spaced apart. The first arm member 21a arranged in the front of one first arm 21 and the first arm member 21a arranged in the front of the other first arm 21 are arranged in different positions in the front-rear direction so as not to interfere with each other. The first arm member 21a arranged in the rear of one first arm 21 and the first arm member 21a arranged in the rear of the other first arm 21 are arranged in different positions in the front-rear direction so as not to interfere with each other.

[0021] The first arm member 21a is formed to extend in a direction from the first fulcrum 21o toward the corresponding first sheave 22. The base portion of the first arm member 21a is rotatably attached to the first bearing member 24 described above. The first sheave 22 is rotatably attached to the tip portion of the first arm member 21a. The first arm member 21a is formed with a first slinging portion 21b. The first slinging portion 21b may include an attachment hole. The first slinging portion 21b is arranged between the base portion and the tip portion of the first arm member 21a.

[0022] The first sheave 22 is rotatably attached to the tip of the corresponding first arm 21. The first sheave 22 is configured so that the main rope 5 is wound around it. The first sheave 22 is disposed between a pair of first arm members 21a that constitute the corresponding first arm 21.

[0023] The first driving unit 23 is configured to rotationally drive the pair of first arms 21. By driving the first driving unit 23, the first arms 21 rotate from the first closed position (see FIG. 4) to the first open position (see FIG. 5).

[0024] As shown in Fig. 4, the first drive unit 23 according to this embodiment includes a pair of chain blocks 23a. The chain blocks 23a are configured to rotate the corresponding first arms 21. The chain blocks 23a are attached to the upper beam 15c of the weight support frame 15. A chain 23b extending from the chain blocks 23a is connected to the corresponding first arms 21. The chains 23b are hooked to mounting holes of first slings 21b formed in the first arm members 21a of the corresponding first arms 21 using shackles or the like (not shown).

[0025] When the chain block 23a winds up the chain 23b, the first arm 21 rotates from the first closed position to the first open position.

[0026] As shown in FIG. 4 , the first closed position is a position where the first sheaves 22 are located in the space between the main ropes 5 extending upward from the counterweight sheaves 9, and the first sheaves 22 abut against the main ropes 5 from the inside. In this case, each first sheave 22 is disposed between two portions of the main ropes 5 extending from the counterweight sheave 9, and abuts against the corresponding portions from the inside. When the first arms 21 are located in the first closed position, the spacing between the main ropes 5 may be equal to the diameter of the counterweight sheaves 9, as in normal operation. The angle formed by the pair of first arms 21 located in the first closed position may be, for example, about 30 degrees, but this angle is arbitrary.

[0027] As shown in Fig. 5, the first open position is a position where the main ropes 5 are spread apart. In this case, the first sheave 22 abuts against the main ropes 5 from the inside, pressing the main ropes 5 outward. When the first arms 21 are positioned in the first open position, the spacing between the main ropes 5 is wider than when they are positioned in the first closed position. The angle formed by the pair of first arms 21 positioned in the first open position may be, for example, about 150 degrees, but this angle is arbitrary as long as the main ropes 5 can be spread apart.

[0028] As shown in Fig. 3, the rope spacing mechanism 30 is configured to move the main rope 5 downward and separate it from the counterweight sheave 9 when the first arm 21 is located at the first open position. The rope spacing mechanism 30 according to this embodiment includes a pair of second arms 31, a pair of second sheaves 32, and a second drive unit 33 (see Fig. 6).

[0029] The second arm 31 is rotatable about a second fulcrum 31o on the weight sheave support frame 16. The second arm 31 is attached to the weight sheave support frame 16 via a second bearing member 34. As shown in FIG. 6 , the second fulcrum 31o is located on a central axis CL that passes through the rotation center 9o of the balance weight sheave 9 and extends in the up-down direction when viewed in the front-to-rear direction. In this embodiment, the second fulcrum 31o is located below the rotation center 9o of the balance weight sheave 9.

[0030] As shown in Fig. 3, each second arm 31 includes a pair of second arm members 31a. The pair of second arm members 31a are arranged on both sides of the weight sheave support frame 16 in the front-rear direction and are spaced apart. The second arm member 31a arranged in the front of one second arm 31 and the second arm member 31a arranged in the front of the other second arm 31 are arranged in different positions in the front-rear direction so as not to interfere with each other. The second arm member 31a arranged in the rear of one second arm 31 and the second arm member 31a arranged in the rear of the other second arm 31 are arranged in different positions in the front-rear direction so as not to interfere with each other.

[0031] The second arm member 31a is formed to extend in a direction from the second fulcrum 31o toward the corresponding second sheave 32. A base portion of the second arm member 31a is rotatably attached to the second bearing member 34 described above. The second sheave 32 is rotatably attached to the tip portion of the second arm member 31a. A second slinging portion 31b is formed on the second arm member 31a. The second slinging portion 31b may include an attachment hole. The second slinging portion 31b is arranged between the base portion and tip portion of the second arm member 31a.

[0032] The second arm 31 is disposed at a different position in the front-rear direction from the first arm 21 described above. This prevents interference between the first arm 21 and the second arm 31. In this embodiment, the two first arm members 21a disposed at the front of the first arm 21 are disposed forward of the two second arm members 31a disposed at the front of the second arm 31. The two first arm members 21a disposed at the rear of the first arm 21 are disposed rearward of the two second arm members 31a disposed at the rear of the second arm 31.

[0033] The second sheave 32 is rotatably attached to the tip of the corresponding second arm 31. The second sheave 32 is configured so that the main rope 5 is wound around it. The second sheave 32 is disposed between a pair of second arm members 31a that constitute the corresponding second arm 31.

[0034] The second driving unit 33 is configured to rotate the pair of second arms 31. By driving the second driving unit 33, the second arms 31 rotate from the second closed position (see FIG. 6) to the second open position (see FIG. 7).

[0035] As shown in Fig. 6, the second drive unit 33 according to this embodiment includes a pair of chain blocks 33a. The chain blocks 33a are configured to rotate the corresponding second arms 31. The chain blocks 33a are attached to the upper beam 15c of the weight support frame 15. A chain 33b extending from the chain blocks 33a is connected to the corresponding second arms 31. The chains 33b are hooked to mounting holes of second slings 31b formed in the second arm members 31a of the corresponding second arms 31 using shackles or the like (not shown).

[0036] When the chain block 33a winds up the chain 33b, the second arm 31 rotates from the second closed position to the second open position.

[0037] 6, the second closed position is a position where the second sheaves 32 are located in the spaces between the main ropes 5 when the first arms 21 are located in the first open position, and the second sheaves 32 abut against the main ropes 5 from the inside. In this case, each second sheave 32 is disposed between two portions of the main ropes 5 extending from the counterweight sheave 9, and abuts against the corresponding portions from the inside. The angle formed by the pair of second arms 31 located in the second closed position is arbitrary.

[0038] 7, the second open position is a position where the main ropes 5 are moved downward and away from the counterweight sheave 9. In this case, the second sheave 32 abuts against the main ropes 5 from above, pressing the main ropes 5 downward. The angle formed by the pair of second arms 31 positioned in the second open position may be, for example, about 150 degrees, but this angle is arbitrary as long as the main ropes 5 can be moved away from the counterweight sheave 9.

[0039] As shown in FIG. 3, the rope holding mechanism 40 is configured to hold the main rope 5 spaced apart from the counterweight sheave 9. The rope holding mechanism 40 according to this embodiment includes a pair of third arms 41 and a pair of third sheaves 42.

[0040] The third arm 41 is attached to the upper beam 15c of the weight support frame 15. The third arm 41 extends upward from the upper beam 15c. The pair of third arms 41 are arranged on both sides of the counterweight sheave 9 in the lateral direction.

[0041] Each third arm 41 includes a pair of third arm members 41a. The pair of third arm members 41a are arranged on both sides of the weight support frame 15 in the front-rear direction and are spaced apart. The third arm member 41a arranged in the front is attached to abut against the front surface of the upper beam 15c of the weight support frame 15. The third arm member 41a arranged in the rear is attached to abut against the rear surface of the weight support frame 15. The pair of third arm members 41a may be connected by a connecting member 43 extending in the front-rear direction.

[0042] 8, a pair of third arms 41 may be connected to each other by a connecting beam 44. Third arm members 41a arranged in the front may be connected to each other by a connecting beam 44 arranged in the front, and a pair of third arm members 41a arranged in the rear may be connected to each other by a connecting beam 44 arranged in the rear, although not shown.

[0043] 3, the third sheave 42 is rotatably attached to the upper end of the corresponding third arm 41. The third sheave 42 is configured so that the main rope 5 is wound around it. The third sheave 42 is disposed between a pair of third arm members 41a that constitute the corresponding third arm 41.

[0044] 8, the third sheave 42 is configured to abut against the main ropes 5 from above when the second arm 31 is in the second open position. In this way, the third sheave 42 can press the main ropes 5 downward, and holds the main ropes 5 spaced apart from the counterweight sheave 9. Therefore, the third sheave 42 can maintain the main ropes 5 spaced apart downward from the counterweight sheave 9.

[0045] Next, the operation of this embodiment configured as described above will be described. Here, a method for replacing a balancing weight sheave using the balancing weight sheave replacing jig 20 shown in Fig. 3 will be described with reference to Figs. 4 to 10.

[0046] First, as shown in Figure 4, a pair of first arms 21 are attached to the counterweight sheave support frame 16 of the counterweight 4, and a first sheave 22 is attached to the tip of each first arm 21. The first arms 21 are positioned in the first closed position, and the first sheave 22 is disposed in the space between the main ropes 5 extending upward from the counterweight sheave 9. The first sheave 22 abuts against the main ropes 5 from the inside. In addition, a pair of chain blocks 23a constituting the first drive unit 23 are attached to the upper beam 15c of the counterweight support frame 15, and the chains 23b extending from each chain block 23a are connected to the first sling units 21b (see Figure 3) of the corresponding first arms 21.

[0047] Next, each chain block 23a of the first drive unit 23 is driven to rotate the first arm 21 from the first closed position to the first open position. As a result, the first arm 21 is positioned at the first open position, as shown in Fig. 5. At this time, the first sheave 22 pushes the main ropes 5 apart, widening the gap between the main ropes 5.

[0048] Next, as shown in FIG. 6, a pair of second arms 31 constituting the rope spacing mechanism 30 are attached to the weight sheave support frame 16, and a second sheave 32 is attached to the tip of each second arm 31. The second arms 31 are positioned in the second closed position, and the second sheave 32 is disposed in the space between the main ropes 5. The second sheave 32 abuts against the main ropes 5 from the inside. In addition, a pair of chain blocks 33a constituting the second drive unit 33 are attached to the upper beam 15c of the weight support frame 15, and a chain 33b extending from each chain block 33a is connected to each second sling unit 31b (see FIG. 3) of the corresponding second arm 31.

[0049] Next, the second drive unit 33 drives each chain block 33a to rotate the second arm 31 from the second closed position to the second open position. As a result, the second arm 31 is positioned at the second closed position, as shown in Fig. 7. At this time, the second sheave 32 spreads the main ropes 5 and moves the main ropes 5 downward. As a result, the main ropes 5 move downward away from the counterweight sheave 9, and the tension on the main ropes 5 is released from the counterweight sheave 9.

[0050] Next, as shown in Fig. 8, a pair of third arms 41 constituting the rope holding mechanism 40 are attached to the upper beam 15c of the counterweight support frame 15, and a third sheave 42 is attached to the upper end of each third arm 41. The third sheave 42 is disposed above the main ropes 5 and abuts against the main ropes 5 from above. As a result, the third sheave 42 holds the main ropes 5 spaced apart from the counterweight sheave 9.

[0051] Next, the first arm 21 is rotated from the first open position toward the first closed position to move the first sheave 22 away from the main rope 5. Then, as shown in Fig. 9, the pair of first arms 21 and the pair of first sheaves 22 are removed. At this time, the pair of chain blocks 23a that constitute the first drive unit 23 may also be removed.

[0052] Next, the second arm 31 is rotated from the second open position toward the second closed position to move the second sheave 32 away from the main rope 5. Then, as shown in Fig. 10, the pair of second arms 31 and the pair of second sheaves 32 are removed. At this time, the pair of chain blocks 33a that constitute the second drive unit 33 may also be removed.

[0053] Next, the counterweight sheave 9 is replaced in the state shown in Fig. 10. At this time, the main rope 5 is separated from the counterweight sheave 9, so the tension of the main rope 5 is released from the counterweight sheave 9. The counterweight sheave 9 is replaced while the main rope 5 separated from the counterweight sheave 9 is held.

[0054] After replacing the counterweight sheave 9, the main rope 5 is wound around the counterweight sheave 9. In this case, the work may be performed in the reverse order of the procedure described above with reference to Figures 4 to 10, but the work procedure for winding the main rope 5 around the counterweight sheave 9 is arbitrary.

[0055] According to this embodiment, the pair of first arms 21, which are rotatable about the first fulcrum 21o on the counterweight sheave support frame 16, rotate from a first closed position in which the first sheave 22 is located in the space between the main ropes 5 extending upward from the counterweight sheave 9 to a first open position in which the main ropes 5 are spread apart by driving the first drive unit 23. With the first arms 21 located in the first open position, the rope separating mechanism 30 moves the main ropes 5 downward to separate them from the counterweight sheave 9. The rope holding mechanism 40 holds the main ropes 5 separated from the counterweight sheave 9. This allows the tension of the main ropes 5 to be released from the counterweight sheave 9, facilitating the replacement of the counterweight sheave 9. This eliminates the need to install a suspension point in the hoistway 2, and allows the counterweight sheave 9 to be easily replaced.

[0056] Furthermore, according to this embodiment, the first fulcrum 21o of the first arm 21 is disposed above the rotation center 9o of the counterweight sheave 9. This makes it possible to spread the main rope 5 while preventing the first arm 21 from becoming too long. This makes it possible to prevent the first arm 21 and the first sheave 22 from interfering with other equipment such as the counterweight guide rail.

[0057] According to this embodiment, the rope spacing mechanism 30 includes a pair of second arms 31 rotatable about second fulcrums 31o on the counterweight sheave support frame 16, a pair of second sheaves 32 rotatably attached to the tip ends of the corresponding second arms 31, and a second drive unit 33 that drives the pair of second arms 31 to rotate. The pair of second arms 31 are in a second closed position where the second sheaves 32 are located in the space between the main ropes 5 when the first arms 21 are in the first open position, and the second sheaves 32 abut against the main ropes 5 from the inside. By driving the second drive unit 33, the pair of second arms 31 are rotated from the second closed position to the second open position where the main ropes 5 are moved downward and separated from the counterweight sheave 9. This allows the main ropes 5 to be easily separated from the counterweight sheave 9.

[0058] Furthermore, according to this embodiment, the second fulcrum 31o of the second arm 31 is disposed below the rotation center 9o of the counterweight sheave 9. This allows the main ropes 5 to be easily moved downward, and the main ropes 5 can be easily separated downward from the counterweight sheave 9. Furthermore, the second arms 31 can be prevented from being inverted downward when they are in the second open position. That is, if the angle formed by the second arms 31 becomes too large (for example, about 180 degrees), the second arms 31 may be subjected to the tension of the main ropes 5 and point diagonally downward. In this case, the pair of second arms 31 may be rotated downward in a closing direction due to the tension of the main ropes 5, thereby narrowing the gap between the main ropes 5. However, according to this embodiment, the second fulcrum 31o of the second arms 31 is disposed below the rotation center 9o of the counterweight sheave 9. Therefore, even when the second arm 31 is positioned in the second open position, the angle of the second arm 31 can be prevented from becoming too large, and the second arm 31 can be prevented from being inverted downward.

[0059] Furthermore, according to this embodiment, the rope holding mechanism 40 includes a pair of third arms 41 and a pair of third sheaves 42. The third arms 41 are attached to the weight support frame 15 and extend upward from the weight support frame 15. The third sheaves 42 are disposed on both sides of the counterweight sheave 9 and are rotatably attached to the upper ends of the corresponding third arms 41. The third sheaves 42 abut against the main ropes 5 from above when the second arms 31 are positioned in the second open position. This makes it possible to easily hold the main ropes 5 separated from the counterweight sheave 9. This allows the tension on the main ropes 5 to be released from the counterweight sheave 9, making it easy to replace the counterweight sheave 9.

[0060] Furthermore, according to this embodiment, the first drive unit 23 includes a pair of chain blocks 23a that rotate the corresponding first arms 21, and a chain 23b extending from each chain block 23a is connected to the corresponding first arm 21. When each chain block 23a winds up the chain 23b, the first arm 21 rotates from the first closed position to the first open position. This allows the first arms 21 to rotate easily, and the main ropes 5 to be easily spread apart.

[0061] In the above-described embodiment, an example has been described in which the first fulcrum 21o is disposed above the center of rotation 9o of the balance weight sheave 9. However, the embodiment is not limited to this. For example, as shown in FIG. 11 , the first fulcrum 21o may be disposed below the center of rotation 9o of the balance weight sheave 9. The first fulcrum 21o may be disposed at the same position as the second fulcrum 31o of the second arm 31 when viewed in the front-to-rear direction. However, although not shown, the first fulcrum 21o may be disposed below the center of rotation 9o of the balance weight sheave 9 and above the second fulcrum 31o.

[0062] In the above-described embodiment, an example has been described in which the first arm 21 and the first sheave 22 are removed first after the rope holding mechanism 40 has held the main rope 5 separated from the counterweight sheave 9. However, the embodiment is not limited to this. For example, the second arm 31 and the second sheave 32 may be removed first after the rope holding mechanism 40 has held the main rope 5.

[0063] (Second embodiment) Next, an elevator balancing weight sheave replacing jig and a balancing weight sheave replacing method according to a second embodiment will be described with reference to FIGS.

[0064] The second embodiment shown in Figures 12 and 13 differs mainly in that a pair of fourth arms constituting the rope spacing mechanism can be contracted from an extended state in which the fourth sheave is located in the space between the main ropes to a contracted state in which the main ropes are moved downward, but the other configurations are substantially the same as those of the first embodiment shown in Figures 1 to 11. Note that in Figures 12 and 13, the same parts as those in the first embodiment shown in Figures 1 to 11 are given the same reference numerals and detailed explanations will be omitted.

[0065] As shown in FIGS. 12 and 13, the rope spacing mechanism 30 according to the present embodiment includes a pair of fourth arms 51, a pair of fourth sheaves 52, a connecting beam 53, and a fourth drive unit 54.

[0066] The fourth arm 51 is attached to the upper beam 15c of the weight support frame 15. The fourth arm 51 extends upward from the upper beam 15c. The pair of fourth arms 51 are arranged on both sides of the counterweight sheave 9 in the lateral direction. The fourth arms 51 are configured to be extendable and retractable in the vertical direction.

[0067] Each fourth arm 51 includes a pair of fourth arm members 51a. The pair of fourth arm members 51a are arranged on both sides of the weight support frame 15 in the front-to-rear direction and are spaced apart. The fourth arm member 51a arranged in the front is attached to abut against the front surface of the upper beam 15c of the weight support frame 15. The fourth arm member 51a arranged in the rear is attached to abut against the rear surface of the upper beam 15c of the weight support frame 15.

[0068] The fourth arm member 51a may include a base 51b attached to the upper beam 15c and an extension 51c that is movable in the up-down direction relative to the base 51b. The extension 51c moves in the up-down direction relative to the base 51b, thereby allowing the fourth arm member 51a to extend and contract in the up-down direction.

[0069] The pair of fourth arms 51 are connected to each other by a connecting beam 53. The pair of fourth arm members 51a arranged in the front may be connected to each other by a connecting beam 53 arranged in the front. Although not shown, the pair of fourth arm members 51a arranged in the rear may be connected to each other by a connecting beam 53 arranged in the rear. The connecting beam 53 may connect the extensions 51c of the corresponding pair of fourth arm members 51a to each other. A slinging portion (not shown) is formed on the connecting beam 53. The slinging portion may be configured similarly to the first slinging portion 21b, etc. The bases 51b of the pair of fourth arm members 51a may be connected to each other by a connecting member (not shown) such as the connecting member 43 shown in FIG. 3.

[0070] The fourth sheave 52 is rotatably attached to the upper end of the corresponding fourth arm 51. The fourth sheave 52 is configured so that the main rope 5 is wound around it. The fourth sheave 52 is disposed between a pair of fourth arm members 51a that constitute the corresponding fourth arm 51.

[0071] The fourth driving unit 54 is configured to contract the fourth arm 51. The fourth driving unit 54 according to the present embodiment extends or retracts the fourth arm 51 by moving the connecting beam 53 downward. By driving the fourth driving unit 54, the connecting beam 53 and the extension portion 51c of the fourth arm member 51a move downward, and the fourth arm 51 contracts from an extended state to a contracted state.

[0072] The fourth drive unit 54 according to this embodiment includes a pair of chain blocks 54a. The chain blocks 54a are configured to move the connecting beam 53 downward. As shown in FIG. 12, the chain blocks 54a are attached to the upper beam 15c of the weight support frame 15. A chain 54b extending from the chain blocks 54a is connected to the connecting beam 53. The chains 54b are hooked to slings formed on each connecting beam 53 using shackles or the like (not shown).

[0073] When the chain block 54a winds up the chain 54b, the fourth arm 51 contracts from the extended state to the contracted state.

[0074] 12, the extended state is a state in which the first arm 21 is in the first open position, the fourth sheave 52 is located in the space between the main ropes 5, and the fourth sheave 52 abuts against the main ropes 5 from above. In this case, the extension portion 51c of the fourth arm member 51a constituting the fourth arm 51 has a relatively long extension length from the base portion 51b. Each fourth sheave 52 is disposed between two portions of the main ropes 5 extending from the counterweight sheave 9, and abuts against the corresponding portion from the inside.

[0075] 13, the contracted state is a state in which the main ropes 5 are moved downward and separated from the counterweight sheaves 9. In this state, the extensions 51c of the fourth arm members 51a constituting the fourth arms 51 are retracted into the bases 51b, and the length of extension from the bases 51b is relatively short. Each fourth sheave 52 abuts against the main ropes 5 from above, pressing the main ropes 5 downward.

[0076] The tension of the chain 54b described above allows the connecting beam 53 to maintain the fourth arm 51 in a contracted state. This allows the fourth arm 51 to hold the main rope 5 spaced apart from the counterweight sheave 9, thereby enabling the rope holding mechanism 40 to function. That is, the rope separating mechanism 30 according to this embodiment also serves as the rope holding mechanism 40, and can hold the main rope 5 spaced apart from the counterweight sheave 9 when the fourth arm 51 is in a contracted state.

[0077] When replacing the counterweight sheave 9, the pair of first arms 21 and the pair of first sheaves 22 are removed while the fourth arm 51 is in the contracted state. At this time, the pair of chain blocks 23a that constitute the first drive unit 23 may also be removed. This allows the counterweight sheave 9 to be replaced.

[0078] As described above, according to the present embodiment, the rope spacing mechanism 30 includes a pair of fourth arms 51 attached to the weight support frame 15 and extending upward from the weight support frame 15, the pair of fourth arms 51 being arranged on both sides of the counterweight sheave 9 and being vertically extendable and contractible, a pair of fourth sheaves 52 rotatably attached to the upper ends of the corresponding fourth arms 51, and a fourth drive unit 54 that contracts the fourth arms 51. The pair of fourth arms 51 are in an extended state in which the fourth sheave 52 is located in the space between the main ropes 5 when the first arms 21 are positioned in the first open position, and the fourth sheave 52 abuts against the main ropes 5 from above. By driving the fourth drive unit 54, the pair of fourth arms 51 contract to a contracted state in which the main ropes 5 are moved downward and separated from the counterweight sheave 9. This makes it possible to easily separate the main ropes 5 from the counterweight sheave 9 and to easily hold the main ropes 5 separated from the counterweight sheave 9. Therefore, the tension of the main rope 5 can be released from the counterweight sheave 9, and the counterweight sheave 9 can be easily replaced.

[0079] Furthermore, according to this embodiment, the rope separating mechanism 30 also serves as the rope holding mechanism 40, and can hold the main rope 5 separated from the balance weight sheave 9 when the fourth arm 51 is in a contracted state. This makes it possible to reduce the number of arms and simplify the configuration of the balance weight sheave replacing jig 20.

[0080] (Third embodiment) Next, an elevator balancing weight sheave replacing jig and a balancing weight sheave replacing method according to a second embodiment will be described with reference to FIG.

[0081] The third embodiment shown in Figure 14 is different mainly in that the first drive unit includes a hydraulic jack that rotates the pair of first arms, and other configurations are substantially the same as those of the first embodiment shown in Figures 1 to 11. In Figure 14, the same parts as those of the first embodiment shown in Figures 1 to 11 are designated by the same reference numerals, and detailed description thereof will be omitted.

[0082] 14, the first driving unit 23 according to the present embodiment includes a hydraulic jack 60. The hydraulic jack 60 is connected to the pair of first arms 21, and is configured to rotate the pair of first arms 21 from a first closed position to a first open position. The pair of first arm members 21a located in the front may be connected to each other by the hydraulic jack 60, and the pair of first arm members 21a located in the rear may be connected to each other by another hydraulic jack 60.

[0083] As described above, according to the present embodiment, the first driving unit 23 includes the hydraulic jack 60 connected to the pair of first arms 21. This allows the pair of first arms 21 to be rotated from the first closed position to the first open position by the hydraulic jack 60. Therefore, the first arms 21 can be easily rotated, and the main ropes 5 can be easily spread apart.

[0084] According to the embodiment described above, it is possible to eliminate the need to install a suspension point in the hoistway, and the counterweight sheave can be easily replaced.

[0085] 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]

[0086] 4: counterweight, 9: counterweight sheave, 9o: center of rotation, 12: counterweight support device, 15: counterweight support frame, 16: counterweight sheave support frame, 20: counterweight sheave replacement jig, 21: first arm, 21o: first fulcrum, 22: first sheave, 23: first drive unit, 23a: chain block, 23b: chain, 30: rope separating mechanism, 31: second arm, 31o: second fulcrum, 32: second sheave, 33: second drive unit, 40: rope holding mechanism, 41: third arm, 42: third sheave, 51: fourth arm, 52: fourth sheave, 54: fourth drive unit, 60: hydraulic jack

Claims

1. A counterweight sheave replacement jig for replacing a counterweight sheave around which a main rope is wound, the counterweight sheave replacement jig being detachably attached to a counterweight support device including a counterweight support frame constituting a counterweight of an elevator and a counterweight sheave support frame attached to the counterweight support frame and supporting a counterweight sheave, a pair of first arms rotatable about a first fulcrum on the weight sheave support frame; a pair of first sheaves rotatably attached to the tip ends of the corresponding first arms; a first drive unit that drives the pair of first arms to rotate; a rope spacing mechanism; a rope retention mechanism; Equipped with the pair of first arms are in a first closed position in which the first sheave is located in a space between the main ropes extending upward from the counterweight sheave, and are capable of rotating from the first closed position in which the first sheave abuts against the main ropes from inside to a first open position in which the main ropes are spread apart by driving the first drive unit; the rope spacing mechanism is configured to move the main rope downward and away from the counterweight sheave when the first arm is positioned at the first open position, the rope retention mechanism is configured to retain the main rope spaced from the counterweight sheave. Elevator balancing weight sheave replacement jig.

2. The first fulcrum is disposed above the rotation center of the balance weight sheave. The elevator balancing weight sheave replacement jig according to claim 1.

3. The rope spacing mechanism includes: a pair of second arms rotatable about a second fulcrum on the weight sheave support frame; a pair of second sheaves rotatably attached to the tip ends of the corresponding second arms; a second drive unit that drives the pair of second arms to rotate; Including, The pair of second arms are capable of rotating from a second closed position in which the second sheave is positioned in a space between the main ropes when the first arms are positioned at the first open position and the second sheave abuts against the main ropes from the inside to a second open position in which the main ropes are moved downward and separated from the counterweight sheave by driving the second drive unit. The elevator balancing weight sheave replacement jig according to claim 1 or 2.

4. The second fulcrum is disposed below the rotation center of the balance weight sheave. The elevator balancing weight sheave replacement jig according to claim 3.

5. The rope holding mechanism includes: a pair of third arms attached to the weight support frame and extending upward from the weight support frame, the pair of third arms being disposed on both sides of the counterweight sheave; a pair of third sheaves rotatably attached to upper ends of the corresponding third arms, the pair of third sheaves abutting against the main rope from above when the second arms are positioned at the second open position and holding the main rope spaced apart from the counterweight sheave; Including, The elevator balancing weight sheave replacement jig according to claim 3.

6. The first fulcrum is disposed below the rotation center of the balancing weight sheave. The elevator balancing weight sheave replacement jig according to claim 1.

7. The rope spacing mechanism includes: a pair of fourth arms attached to the weight support frame and extending upward from the weight support frame, the pair of fourth arms being disposed on both sides of the counterweight sheave and being extendable and contractible in the vertical direction; a pair of fourth sheaves rotatably attached to upper ends of the corresponding fourth arms; a fourth drive unit that retracts the fourth arm; Including, the pair of fourth arms are in an extended state in which the fourth sheave is located in a space between the main ropes when the first arms are located at the first open position, and can be contracted from the extended state in which the fourth sheave abuts against the main ropes from above to a contracted state in which the main ropes are moved downward and separated from the counterweight sheave by driving the fourth drive unit, The rope separating mechanism also serves as the rope holding mechanism and is capable of holding the main rope separated from the counterweight sheave when the fourth arm is in a contracted state. The elevator balancing weight sheave replacement jig according to claim 1 or 2.

8. the first driving unit includes a pair of chain blocks that rotate the corresponding first arms, a chain extending from each of the chain blocks is connected to the corresponding first arm; When each of the chain blocks winds up the chain, the first arm rotates from the first closed position to the first open position. The elevator balancing weight sheave replacement jig according to claim 1 or 2.

9. the first driving unit includes a hydraulic jack connected to the pair of first arms and rotating the pair of first arms; The elevator balancing weight sheave replacement jig according to claim 1 or 2.

10. A method for replacing a counterweight sheave, which is supported by a counterweight sheave support frame attached to a counterweight support frame constituting a counterweight of an elevator, and on which a main rope is wound, comprising: a step of attaching a pair of first arms to the weight sheave support frame so that they can rotate about a first fulcrum, and attaching a pair of first sheaves to tip ends of the corresponding first arms so that they can rotate; a step of rotating the pair of first arms from a first closed position in which the first sheave is located in a space between the main ropes extending upward from the counterweight sheave and the first sheave abuts against the main ropes from inside to a first open position, thereby spreading the main ropes apart; moving the main rope downward and away from the counterweight sheave with the first arm in the first open position; maintaining the main rope spaced from the counterweight sheave; replacing the counterweight sheave while holding the main rope; The method for replacing an elevator counterweight sheave is provided with the steps.

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