Elevator counterweight sheave replacement jig and counterweight sheave replacement method

Abstract

This invention provides an elevator counterweight sheave replacement jig that eliminates the need to install a suspension point in the hoistway and allows for easy replacement of the counterweight sheave. [Solution] The pair of first arms of the elevator counterweight device according to the embodiment are rotatable from a first closed position in which the first sheave is located in the space between the counterweight sheave and the main rope extending upward from the counterweight sheave, and the first sheave is in contact with the main rope from the inside, to a first open position in which the main rope is pushed open. The rope separation mechanism is configured to move the main rope downward when the first arms are in the first open position, thereby separating it from the counterweight sheave. The rope holding mechanism is configured to hold the main rope that has been separated from the counterweight sheave.

Description

Technical Field

[0001] The embodiments relate to a balance weight sheave replacement jig for an elevator and a balance weight sheave replacement method.

Background Art

[0002] An elevator device is known in which a car and a balance weight 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 wound around a balance weight sheave attached to the balance weight.

[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 ceiling of the car. In this case, a hoist is hung on a suspension point installed on the top of the hoistway or the connecting plate of the guide rail, and the car and the weight support frame of the balance weight are lifted. This makes it possible to remove the tension applied to the main rope and replace the balance weight sheave.

[0004] However, in such replacement work, if the height position of the balance weight during the replacement work of the balance weight sheave is far from the hoist, the workability may be reduced due to the expansion and contraction of the hoisting rope. In addition, there is a problem that it takes time to install the suspension point on the connecting plate of the guide rail. Furthermore, depending on the position of the connecting plate, there is also a problem that the hoisting rope may interfere with other devices in the hoistway.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The embodiment aims to provide an elevator counterweight sheave replacement jig and counterweight sheave replacement method that eliminates the need to install a suspension source in the hoistway and allows for easy replacement of the counterweight sheave. [Means for solving the problem]

[0007] The elevator counterweight sheave replacement jig according to this embodiment is a jig for replacing the counterweight sheave around which the main rope is wound, and is detachably attached to a counterweight support device which includes a counterweight support frame that constitutes the elevator's counterweight and a counterweight sheave support frame attached to the counterweight support frame that supports the counterweight sheave. The counterweight sheave replacement jig comprises a pair of first arms that are rotatable about a first pivot point on the counterweight sheave support frame, a pair of first sheaves rotatably attached to the tips of the corresponding first arms, a first drive unit that rotates the pair of first arms, a rope separation 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 rope extending upward from the counterweight sheave and the first sheaves abut the main rope from the inside, to a first open position in which the main rope is pushed open by driving the first drive unit. The rope separation mechanism is configured to move the main rope downward while the first arm is in the first open position, thereby separating it from the counterweight sheave. The rope holding mechanism is configured to hold the main rope that has been separated from the counterweight sheave.

[0008] The method for replacing the counterweight sheave of an elevator according to this embodiment is a method for replacing a counterweight sheave that is supported by a counterweight sheave support frame attached to a counterweight support frame that is attached to a counterweight support frame that constitutes the counterweight of an elevator, and around which the main rope is wound. The method for replacing the counterweight sheave includes the steps of: attaching a pair of first arms to the counterweight sheave support frame so as to be rotatable around a first pivot point, and attaching a pair of first sheaves so as to be rotatable to the tips of the corresponding first arms; rotating the pair of first arms from a first closed position, in which the first sheaves are located in the space between the counterweight sheave and the main rope extending upward from the main rope, and in which the first sheaves abut the main rope from the inside, to a first open position to spread the main rope apart; moving the main rope downward while the first arms are in the first open position to separate it from the counterweight sheave; holding the main rope that has been separated from the counterweight sheave; and replacing the counterweight sheave while holding the main rope. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic diagram showing an elevator device according to the first embodiment. [Figure 2] Figure 2 is a front view showing the counterweight shown in Figure 1. [Figure 3] Figure 3 is a front perspective view showing a counterweight sheave replacement jig according to the first embodiment. [Figure 4] Figure 4 is a schematic diagram showing the state in which the first sheave is positioned in the first closed position in the counterweight sheave replacement method according to this embodiment. [Figure 5] Figure 5 is a schematic diagram showing the state in which the first arm is positioned in the first open position, following Figure 4. [Figure 6] Figure 6 is a schematic diagram showing the second sheave positioned in the second closed position, following Figure 5. [Figure 7] Figure 7 is a schematic diagram showing the second arm positioned in the second open position, following Figure 6. [Figure 8] Figure 8 is a schematic diagram showing the state after the third arm has been installed, following Figure 7. [Figure 9] Figure 9 is a schematic diagram showing the state after removing the first arm and the first sheave, following Figure 8. [Figure 10] Figure 10 is a schematic diagram showing the state after removing the second arm and the second sheave, following Figure 9. [Figure 11] Figure 11 is a schematic diagram showing a modified example of the counterweight sheave replacement jig shown in Figure 3. [Figure 12] Figure 12 is a schematic diagram showing the extended state of the fourth arm in a counterweight sheave replacement jig according to the second embodiment. [Figure 13] Figure 13 is a schematic diagram showing the contracted state of the fourth arm. [Figure 14] Figure 14 is a schematic diagram showing a counterweight sheave replacement jig according to a third embodiment. [Modes for carrying out the invention]

[0010] (First Embodiment) The counterweight sheave replacement jig and counterweight sheave replacement method for the elevator in this embodiment will be described below with reference to the drawings. First, the elevator device according to this embodiment will be described.

[0011] As shown in Fig. 1, the elevator device 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 provided on a hoisting machine 6 and a deflecting sheave 7. The main rope 5 is wound around a car sheave 8 provided on the car 3 and a counterweight sheave 9 provided on the counterweight 4. When the hoisting machine 6 winds up the main rope 5, the car 3 and the counterweight 4 move up and down. 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 device 1 including the hoisting machine 6. For example, the control panel 11 controls the operation of the hoisting machine 6 in response to landing calls and car calls, and lands the car 3 at the landing on the floor where the call is registered.

[0012] Note that the elevator device 1 is not limited to the form shown in Fig. 1. For example, it may be a so-called machine-roomless elevator device. That is, without providing the machine room 10, the hoisting machine 6 and the control panel 11 may be provided in the upper part of the hoistway 2 or the like.

[0013] As shown in Fig. 2, the counterweight 4 includes a weight support device 12, a plurality of weight bodies 13, and a weight retainer 14. The weight support device 12 includes a weight support frame 15 and a weight 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 weight bodies 13. A guide portion (not shown) such as a guide roller is attached to the weight support frame 15, and the counterweight 4 is configured to be movable up and down 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 weight bodies 13 are stacked and supported on the lower beam 15a. The plurality of weight bodies 13 are pressed by the weight retainer 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 balance weight sheave 9 is rotatably supported by the weight sheave support frame 16. The weight sheave support frame 16 includes two plate-like members spaced apart in the front-rear direction, and the balance weight sheave 9 is disposed between these members. In the present embodiment, one balance weight sheave 9 is attached to the balance weight 4.

[0016] In the following description, the left-right direction of the balance weight 4 shown in FIG. 2 is defined as the lateral direction, and the direction perpendicular to the plane of FIG. 2 is defined as the front-rear direction. The up-down direction in FIG. 2 is a direction orthogonal to both the lateral direction and the front-rear direction.

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

[0018] The balance weight sheave replacement 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 separation mechanism 30, and a rope holding mechanism 40.

[0019] The first arm 21 is rotatable about a first fulcrum 21o with respect to 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 disposed on a central axis CL that extends in the vertical direction passing through the rotation center 9o of the balance weight sheave 9 when viewed in the front-rear direction. In the present embodiment, the first fulcrum 21o is disposed above the rotation center of the balance weight sheave.

[0020] As shown in Figure 3, each first arm 21 includes a pair of first arm members 21a. The pair of first arm members 21a are positioned on both sides of the weight sheave support frame 16 in the front-rear direction and are spaced apart. The first arm member 21a positioned at the front of one first arm 21 and the first arm member 21a positioned at the front of the other first arm 21 are positioned at different positions in the front-rear direction so as not to interfere with each other. The first arm member 21a positioned at the rear of one first arm 21 and the first arm member 21a positioned at the rear of the other first arm 21 are positioned at 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 toward the corresponding first sheave 22 from the first pivot point 21o. The base 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 of the first arm member 21a. The first lifting portion 21b is formed on the first arm member 21a. The first lifting portion 21b may include a mounting hole. The first lifting portion 21b is located between the base and tip of the first arm member 21a.

[0022] The first sheave 22 is rotatably mounted on the tip of the corresponding first arm 21. The first sheave 22 is configured around which the main rope 5 is wound. The first sheave 22 is positioned between a pair of first arm members 21a that make up the corresponding first arm 21.

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

[0024] As shown in Figure 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. Chains 23b extending from the chain blocks 23a are connected to the corresponding first arms 21. The chains 23b are hooked onto mounting holes of the first lifting portions 21b formed on each of the first arm members 21a of the corresponding first arms 21 using shackles or the like (not shown).

[0025] As 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] The first closed position is the position in which the first sheave 22 is located in the space between the main rope 5 extending upward from the counterweight sheave 9, as shown in Figure 4, and the first sheave 22 is in contact with the main rope 5 from the inside. In this case, each first sheave 22 is positioned between two portions of the main rope 5 extending from the counterweight sheave 9 and is in contact with the corresponding portions from the inside. When the first arm 21 is in the first closed position, the spacing of the main rope 5 may be equal to the diameter of the counterweight sheave 9, as in normal operation. The angle formed by the pair of first arms 21 positioned in the first closed position may be, for example, about 30 degrees, but this angle is arbitrary.

[0027] The first open position is the position in which the main rope 5 is spread apart, as shown in Figure 5. In this case, the first sheave 22 is in contact with the main rope 5 from the inside and is pressing the main rope 5 outwards. When the first arm 21 is in the first open position, the spacing between the main ropes 5 is wider than when it is 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 it can spread the main ropes 5 apart.

[0028] As shown in Figure 3, the rope separation mechanism 30 is configured to move the main rope 5 downward while the first arm 21 is in the first open position, thereby separating it from the counterweight sheave 9. The rope separation 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 Figure 6).

[0029] The second arm 31 is rotatable on the counterweight sheave support frame 16 around a second pivot point 31o. The second arm 31 is attached to the counterweight sheave support frame 16 via a second bearing member 34. As shown in Figure 6, the second pivot point 31o is located on the central axis CL that extends vertically through the rotation center 9o of the counterweight sheave 9 when viewed in the front-rear direction. In this embodiment, the second pivot point 31o is located below the rotation center 9o of the counterweight sheave 9.

[0030] As shown in Figure 3, each second arm 31 includes a pair of second arm members 31a. The pair of second arm members 31a are positioned on both sides of the weight sheave support frame 16 in the front-rear direction and are spaced apart. The second arm member 31a positioned at the front of one second arm 31 and the second arm member 31a positioned at the front of the other second arm 31 are positioned at different positions in the front-rear direction so as not to interfere with each other. The second arm member 31a positioned at the rear of one second arm 31 and the second arm member 31a positioned at the rear of the other second arm 31 are positioned at 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 toward the corresponding second sheave 32 from the second pivot point 31o. The base 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 of the second arm member 31a. The second arm member 31a has a second lifting portion 31b formed thereon. The second lifting portion 31b may include a mounting hole. The second lifting portion 31b is positioned between the base and tip of the second arm member 31a.

[0032] The second arm 31 is positioned at a different location 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 positioned in front of the first arm 21 are positioned in front of the two second arm members 31a positioned in front of the second arm 31. The two first arm members 21a positioned in rear of the first arm 21 are positioned in rear of the two second arm members 31a positioned in rear of the second arm 31.

[0033] The second sheave 32 is rotatably mounted on the tip of the corresponding second arm 31. The second sheave 32 is configured around which the main rope 5 is wound. The second sheave 32 is positioned between a pair of second arm members 31a that constitute the corresponding second arm 31.

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

[0035] As shown in Figure 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 chain 33b is hooked onto mounting holes of the second lifting portion 31b formed on each second arm member 31a of the corresponding second arms 31 using a shackle or the like (not shown).

[0036] As 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] The second closed position, as shown in Figure 6, is the position in which the second sheave 32 is located in the space between the main ropes 5 with the first arm 21 in the first open position, and the second sheave 32 is in contact with the main ropes 5 from the inside. In this case, each second sheave 32 is positioned between two portions of the main rope 5 that extend from the counterweight sheave 9, and is in contact with the corresponding portions from the inside. The angle formed by the pair of second arms 31 positioned in the second closed position is arbitrary.

[0038] The second open position is the position where the main rope 5 is moved downward and separated from the counterweight sheave 9, as shown in Figure 7. In this case, the second sheave 32 is in contact with the main rope 5 from above and is pressing the main rope 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 rope 5 can be separated from the counterweight sheave 9.

[0039] As shown in Figure 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 positioned 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 positioned on both sides of the weight support frame 15 in the front-rear direction and spaced apart. The third arm member 41a positioned at the front is mounted in contact with the front surface of the upper beam 15c of the weight support frame 15. The third arm member 41a positioned at the rear is mounted in contact with 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] As shown in Figure 8, a pair of third arms 41 may be connected to each other by a connecting beam 44. Two third arm members 41a located at the front may be connected by a connecting beam 44 located at the front, and although not shown, a pair of third arm members 41a located at the rear may be connected by a connecting beam 44 located at the rear.

[0043] As shown in Figure 3, the third sheave 42 is rotatably mounted on the upper end of the corresponding third arm 41. The third sheave 42 is configured around which the main rope 5 is wound. The third sheave 42 is positioned between a pair of third arm members 41a that make up the corresponding third arm 41.

[0044] As shown in Figure 8, the third sheave 42 is configured to contact the main rope 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 rope 5 downward and hold the main rope 5 separated from the counterweight sheave 9. Therefore, the third sheave 42 can maintain the state in which the main rope 5 is separated downward from the counterweight sheave 9.

[0045] Next, the operation of this embodiment, which has the above configuration, will be described. Here, the method of replacing the counterweight sheave using the counterweight sheave replacement jig 20 shown in Figure 3 will be explained with reference to Figures 4 to 10.

[0046] First, as shown in Figure 4, a pair of first arms 21 are attached to the weight 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 sheaves 22 are positioned in the space between the main rope 5 extending upward from the counterweight sheave 9. The first sheaves 22 are in contact with the main rope 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 weight support frame 15, and the chains 23b extending from each chain block 23a are connected to the respective first lifting portions 21b (see Figure 3) of the corresponding first arms 21.

[0047] Next, the chain blocks 23a of the first drive unit 23 are 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 in the first open position, as shown in Figure 5. At this time, the first sheave 22 pushes the main rope 5 apart, widening the gap between the main ropes 5.

[0048] Next, as shown in Figure 6, a pair of second arms 31 constituting the rope separation 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 sheaves 32 are placed in the space between the main ropes 5. The second sheaves 32 are in contact with 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 the chains 33b extending from each chain block 33a are connected to the corresponding second lifting portions 31b (see Figure 3) of the second arms 31.

[0049] Next, the chain blocks 33a of the second drive unit 33 are driven 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 in the second closed position, as shown in Figure 7. At this time, the second sheave 32 pushes the main rope 5 apart and moves the main rope 5 downward. As a result, the main rope 5 moves downward away from the counterweight sheave 9, and the tension on the main rope 5 is released from the counterweight sheave 9.

[0050] Next, as shown in Figure 8, a pair of third arms 41 constituting the rope holding mechanism 40 are attached to the upper beam 15c of the weight support frame 15, and a third sheave 42 is attached to the upper end of each third arm 41. The third sheave 42 is positioned above the main rope 5 and is in contact with the main rope 5 from above. In this way, the third sheave 42 holds the main rope 5 which is separated from the counterweight sheave 9.

[0051] Next, the first arm 21 is rotated from the first open position to the first closed position to separate the first sheave 22 from the main rope 5. Then, as shown in Figure 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 to the second closed position to separate the second sheave 32 from the main rope 5. Then, as shown in Figure 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 Figure 10. At this time, the main rope 5 is separated from the counterweight sheave 9, so the tension on the main rope 5 is released from the counterweight sheave 9. The counterweight sheave 9 is replaced while holding the main rope 5 which is separated from the counterweight sheave 9.

[0054] After replacing the counterweight sheave 9, the main rope 5 is wrapped around the counterweight sheave 9. In this case, the procedure may be reversed from the procedure described above using Figures 4 to 10, but the procedure for wrapping the main rope 5 around the counterweight sheave 9 is optional.

[0055] As described above, according to this embodiment, a pair of first arms 21, which are rotatable on the counterweight sheave support frame 16 around a first pivot point 21o, rotate from a first closed position, where the first sheave 22 is located in the space between the counterweight sheave 9 and the main rope 5 extending upward, to a first open position, where the main rope 5 is spread apart, by driving the first drive unit 23. The rope separation mechanism 30 moves the main rope 5 downward while the first arms 21 are in the first open position, separating it from the counterweight sheave 9. The rope holding mechanism 40 holds the main rope 5 that has been separated from the counterweight sheave 9. This allows the tension of the main rope 5 to be released from the counterweight sheave 9, making it easy to replace the counterweight sheave 9. For this reason, it is not necessary to install a suspension point in the hoistway 2, and the counterweight sheave 9 can be easily replaced.

[0056] Furthermore, according to this embodiment, the first support point 21o of the first arm 21 is positioned above the rotation center 9o of the counterweight sheave 9. This prevents the first arm 21 from becoming too long while still allowing the main rope 5 to be spread apart. As a result, the first arm 21 and the first sheave 22 can be prevented from interfering with other equipment such as the counterweight guide rail.

[0057] Furthermore, according to this embodiment, the rope separation mechanism 30 includes a pair of second arms 31 that are rotatable on the counterweight sheave support frame 16 around a second pivot point 31o, a pair of second sheaves 32 that are rotatably attached to the corresponding tips of the second arms 31, and a second drive unit 33 that rotates the pair of second arms 31. The pair of second arms 31 rotate from a second closed position, where the second sheaves 32 are located in the space between the main ropes 5 with the first arm 21 in a first open position and the second sheaves 32 are in contact with the main ropes 5 from the inside, to a second open position, where the second drive unit 33 is driven to move the main ropes 5 downward and separate them from the counterweight sheave 9. This makes it easy to separate the main ropes 5 from the counterweight sheave 9.

[0058] Furthermore, according to this embodiment, the second pivot point 31o of the second arm 31 is positioned below the rotation center 9o of the counterweight sheave 9. This allows the main rope 5 to be easily moved downward, and the main rope 5 to be easily separated downward from the counterweight sheave 9. In addition, it prevents the second arm 31 from reversing downward when it is in the second open position. That is, if the angle formed by the second arm 31 becomes too large (for example, to about 180 degrees), it is possible that the second arm 31 will be angled downward due to the tension of the main rope 5. In this case, the pair of second arms 31 may rotate downward in the closing direction due to the tension of the main rope 5, potentially narrowing the distance between the main ropes 5. However, according to this embodiment, the second pivot point 31o of the second arm 31 is positioned below the rotation center 9o of the counterweight sheave 9. Therefore, even when the second arm 31 is positioned in the second open position, it is possible to prevent the angle of the second arm 31 from becoming too large and to prevent the second arm 31 from reversing downwards.

[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 positioned 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 contact the main rope 5 from above when the second arm 31 is in the second open position. This makes it easy to hold the main rope 5 when it is separated from the counterweight sheave 9. As a result, the tension of the main rope 5 can be released from the counterweight sheave 9, and the counterweight sheave 9 can be easily replaced.

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

[0061] In the embodiment described above, an example was described in which the first pivot point 21o is positioned above the rotation center 9o of the counterweight sheave 9. However, this embodiment is not limited to this. For example, as shown in Figure 11, the first pivot point 21o may be positioned below the rotation center 9o of the counterweight sheave 9. The first pivot point 21o may be positioned at the same location as the second pivot point 31o of the second arm 31 when viewed in the front-rear direction. However, although not shown, the first pivot point 21o may be positioned below the rotation center 9o of the counterweight sheave 9 and above the second pivot point 31o.

[0062] Furthermore, in the above-described embodiment, an example was described in which the rope holding mechanism 40 holds the main rope 5 separated from the counterweight sheave 9, and then the first arm 21 and the first sheave 22 are removed first. However, this 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 holds the main rope 5.

[0063] (Second Embodiment) Next, with reference to Figures 12 and 13, a second embodiment of the elevator counterweight sheave replacement jig and counterweight sheave replacement method will be described.

[0064] In the second embodiment shown in Figures 12 and 13, the main difference is that the pair of fourth arms constituting the rope separation mechanism can be retracted from an extended state in which the fourth sheave is positioned in the space between the main ropes to a contracted state that moves the main ropes downward. The other configurations are substantially the same as those of the first embodiment shown in Figures 1 to 11. In Figures 12 and 13, the same reference numerals are used for parts that are the same as those in the first embodiment shown in Figures 1 to 11, and detailed descriptions are omitted.

[0065] As shown in Figures 12 and 13, the rope separation mechanism 30 according to this 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 positioned on both sides of the counterweight sheave 9 in the lateral direction. The fourth arm 51 is 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 positioned on both sides of the weight support frame 15 in the front-rear direction and spaced apart. The front fourth arm member 51a is mounted in contact with the front surface of the upper beam 15c of the weight support frame 15. The rear fourth arm member 51a is mounted in contact with 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 vertically relative to the base 51b. By moving the extension 51c vertically relative to the base 51b, the fourth arm member 51a is configured to be extendable and retractable in the vertical direction.

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

[0070] The fourth sheave 52 is rotatably mounted on the upper end of the corresponding fourth arm 51. The fourth sheave 52 is configured around which the main rope 5 is wound. The fourth sheave 52 is positioned between a pair of fourth arm members 51a that make up the corresponding fourth arm 51.

[0071] The fourth drive unit 54 is configured to retract the fourth arm 51. In this embodiment, the fourth drive unit 54 extends and retracts the fourth arm 51 by moving the connecting beam 53 downward. By driving the fourth drive unit 54, the connecting beam 53 and the extension portion 51c of the fourth arm member 51a move downward, and the fourth arm 51 retracts from the extended state to the retracted 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 Figure 12, the chain blocks 54a are attached to the upper beam 15c of the weight support frame 15. Chains 54b extending from the chain blocks 54a are connected to the connecting beams 53. The chains 54b are attached to the lifting sections formed on each connecting beam 53 using shackles or the like (not shown).

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

[0074] In the extended state, as shown in Figure 12, the first arm 21 is in the first open position and the fourth sheave 52 is positioned in the space between the main ropes 5, and the fourth sheave 52 is in contact with the main ropes 5 from above. In this case, the extension portion 51c of the fourth arm member 51a that constitutes the fourth arm 51 has a relatively long extension length from the base portion 51b. Each fourth sheave 52 is positioned between two portions of the main rope 5 that extend from the counterweight sheave 9, and contacts the corresponding portions from the inside.

[0075] The contracted state, as shown in Figure 13, is a state in which the main rope 5 is moved downward and separated from the counterweight sheave 9. In this case, the extension 51c of the fourth arm member 51a that constitutes the fourth arm 51 is pulled into the base 51b, and the length extending from the base 51b is relatively short. Each of the fourth sheaves 52 is in contact with the main rope 5 from above and is pressing the main rope 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. As a result, the fourth arm 51 can hold the main rope 5 that is separated from the counterweight sheave 9, and the rope holding mechanism 40 can perform its function. In other words, the rope separation mechanism 30 in this embodiment also serves as the rope holding mechanism 40, and can hold the main rope 5 that is separated from the counterweight sheave 9 in the contracted state of the fourth arm 51.

[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 retracted 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 this embodiment, the rope separation mechanism 30 includes a pair of fourth arms 51 attached to the counterweight support frame 15 and extending upward from the counterweight support frame 15, the pair of fourth arms 51 being arranged on both sides of the counterweight sheave 9 and being extendable and retractable in the vertical direction, a pair of fourth sheaves 52 rotatably attached to the upper ends of the corresponding fourth arms 51, and a fourth drive unit 54 for retracting the fourth arms 51. The pair of fourth arms 51 are in an extended state where the fourth sheaves 52 are positioned in the space between the main ropes 5 when the first arm 21 is in a first open position, and the fourth sheaves 52 are in contact with the main ropes 5 from above. By driving the fourth drive unit 54, the main ropes 5 are moved downward and separated from the counterweight sheave 9. This makes it easy to separate the main ropes 5 from the counterweight sheave 9 and to easily hold the main ropes 5 that have been separated from the counterweight sheave 9. Therefore, the tension on 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 separation mechanism 30 also serves as the rope holding mechanism 40, and can hold the main rope 5 separated from the counterweight sheave 9 when the fourth arm 51 is retracted. As a result, the number of arms can be reduced, and the configuration of the counterweight sheave replacement jig 20 can be simplified.

[0080] (Third embodiment) Next, with reference to Figure 14, a second embodiment of the elevator counterweight sheave replacement jig and counterweight sheave replacement method will be described.

[0081] In the third embodiment shown in Figure 14, the main difference is that the first drive unit includes a hydraulic jack for rotating a pair of first arms; the other configurations are substantially the same as those of the first embodiment shown in Figures 1 to 11. In Figure 14, the same reference numerals are used for parts identical to those of the first embodiment shown in Figures 1 to 11, and detailed descriptions are omitted.

[0082] As shown in Figure 14, the first drive unit 23 according to this embodiment includes a hydraulic jack 60. The hydraulic jack 60 is connected to a 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 positioned at the front are connected to each other by the hydraulic jack 60, and the pair of first arm members 21a positioned at the rear may be connected to each other by another hydraulic jack 60.

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

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

[0085] 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]

[0086] 4: Counterweight, 9: Counterweight sheave, 90: Rotation center, 12: Weight support device, 15: Weight support frame, 16: Weight sheave support frame, 20: Counterweight sheave replacement jig, 21: First arm, 210: First pivot point, 22: First sheave, 23: First drive unit, 23a: Chain block, 23b: Chain, 30: Rope release mechanism, 31: Second arm, 310: Second pivot point, 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, on which a main rope is wound, which is detachably attached to a counterweight support device including a counterweight support frame that constitutes the counterweight of an elevator, and a counterweight sheave support frame attached to the counterweight support frame that supports a counterweight sheave, The weight sheave support frame is provided with a pair of first arms that can rotate around a first pivot point, A pair of first sheaves rotatably attached to the tip of the corresponding first arm, A first drive unit that rotates the pair of first arms, Rope separation mechanism, Rope holding mechanism, Equipped with, The pair of first arms are rotatable from a first closed position, in which the first sheave is located in the space between the main rope extending upward from the counterweight sheave, and in a first open position, in which the main rope is pushed outwards, by driving the first drive unit. The rope separation mechanism is configured to move the main rope downward while the first arm is in the first open position, thereby separating it from the counterweight sheave. The rope holding mechanism is configured to hold the main rope when it is separated from the counterweight sheave. A jig for replacing the counterweight sheave in an elevator.

2. The first pivot point is located above the center of rotation of the counterweight sheave. The elevator counterweight sheave replacement jig according to claim 1.

3. The aforementioned rope separation mechanism is The aforementioned weight sheave support frame includes a pair of second arms that can rotate around a second pivot point, A pair of second sheaves rotatably attached to the tip of the corresponding second arm, A second drive unit that rotates the pair of second arms, Includes, The pair of second arms are rotatable from a second closed position, in which the second sheave is located in the space between the main ropes when the first arm is in the first open position, and the second sheave is in contact with the main rope from the inside, to a second open position, in which the main rope is moved downward and separated from the counterweight sheave by driving the second drive unit. The elevator counterweight sheave replacement jig according to claim 1 or 2.

4. The second pivot point is located below the center of rotation of the counterweight sheave. The elevator counterweight sheave replacement jig according to claim 3.

5. The rope holding mechanism is A pair of third arms attached to the weight support frame, extending upward from the weight support frame, the pair of third arms positioned on both sides of the counterweight sheave, A pair of third sheaves rotatably mounted on the upper end of the corresponding third arm, the pair of third sheaves contacting the main rope from above when the second arm is in the second open position and holding the main rope separated from the counterweight sheave, including, The elevator counterweight sheave replacement jig according to claim 3.

6. The first pivot point is located below the center of rotation of the counterweight sheave. The elevator counterweight sheave replacement jig according to claim 1.

7. The aforementioned rope separation mechanism is A pair of fourth arms attached to the weight support frame, extending upward from the weight support frame, the pair of fourth arms positioned on both sides of the counterweight sheave and being extendable and retractable in the vertical direction, A pair of fourth sheaves rotatably mounted on the upper end of the corresponding fourth arm, A fourth drive unit that retracts the fourth arm, Includes, The pair of fourth arms are able to contract from an extended state in which the fourth sheave is positioned in the space between the main ropes when the first arm is in the first open position, and in an extended state in which the fourth sheave is in contact with the main rope from above, to a contracted state in which the main rope is moved downward and separated from the counterweight sheave by driving the fourth drive unit. The rope separation mechanism also serves as the rope holding mechanism, and is capable of holding the main rope that has separated from the counterweight sheave when the fourth arm is retracted. The elevator counterweight sheave replacement jig according to claim 1 or 2.

8. The first drive unit includes a pair of chain blocks that rotate the corresponding first arm, Each chain extending from the chain block is connected to the corresponding first arm. As 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 counterweight sheave replacement jig according to claim 1 or 2.

9. The first drive unit includes a hydraulic jack connected to the pair of first arms, which rotates the pair of first arms. The elevator counterweight sheave replacement jig according to claim 1 or 2.

10. A counterweight sheave supported by a counterweight sheave support frame attached to a counterweight support frame constituting the counterweight of an elevator, and a method for replacing a counterweight sheave around which the main rope is wound, The process involves rotatably attaching a pair of first arms to the weight sheave support frame around a first pivot point, and rotatably attaching a pair of first sheaves to the corresponding tips of the first arms, The process of rotating a pair of first arms from a first closed position, where the first sheave is located in the space between the main rope extending upward from the counterweight sheave and the first sheave abuts the main rope from the inside, to a first open position, thereby spreading the main rope apart, The process involves moving the main rope downward while the first arm is in the first open position, thereby separating it from the counterweight sheave. A step of holding the main rope that is separated from the counterweight sheave, The process of replacing the counterweight sheave while holding the main rope, A method for replacing the counterweight sheave of an elevator, equipped with [a specific feature / feature].

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