Elevator rope clamping fixture

Abstract

To provide a rope sandwiching tool capable of improving work efficiency when a main rope is collected in exchange work of the main rope for an elevator.SOLUTION: There is a sandwiching tool 40 for sandwiching a main rope 12 to collect the main rope 12 for an elevator 10, the sandwiching tool comprising: a pair of lever arms 41, 42; a support shaft 43 which rotates and supports the pair of lever arms 41, 42; and a pair of sandwich pieces 44 which are provided at the pair of lever arms 41, 42, respectively and sandwich the main rope 12 by closing the pair of lever arms 41, 42. At least one lever arm 42 is removable from the support shaft 43.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rope clamping jig used when retrieving a main rope during replacement work of an elevator main rope. [Background technology]

[0002] An elevator is a passenger transport device that carries passengers in a car and raises and lowers the car in a hoistway according to the passengers' requests. To raise and lower the car in the hoistway, a main rope is attached to the car and suspended in the hoistway by a pulley or the like, and the main rope is moved in the hoistway using a hoist or the like. The main rope is driven by the hoistway via the pulley or the like, and therefore wears out and is replaced during maintenance inspections and model changes.

[0003] Patent Document 1 discloses a procedure for replacing an elevator main rope. The procedure for replacing the main rope involves fixing the car to a frame on the ceiling side with a chain block, supporting a counterweight with a pipe support, connecting a new main rope to the old main rope, and having a worker on the top floor manually retrieve the old main rope so that the new main rope is stretched over the elevator pulley, etc. When retrieving the old main rope, the worker uses a clamping tool to hold the old main rope in order to pull it.

[0004] A conventional clamping jig 50 will be described with reference to Figures 8 and 9. Figure 8 is a plan view showing the clamping jig 50. Figure 9 is a side view showing the clamping jig 50.

[0005] As shown in Figs. 8 and 9, the clamping jig 50 is a jig that clamps the old main rope 12 in order to pull it when recovering the old main rope 12. In the following, the clamping jig 50, in which the old main rope 12 is simply referred to as the main rope 12, has two lever arms 51 and 52 on the left and right, the rear ends of which are rotatably supported by a support shaft 53. The front ends of the pair of lever arms 51 are fixed to a gripping portion 51B. Similarly, the rear ends of the pair of lever arms 52 are fixed to a gripping portion 52B. Pipe portions 51A and 52A are fixed to the pair of lever arms 51 and 52, and the main rope 12 can be clamped and fixed by these pipe portions 51A and 52A. The worker closes the pair of lever arms 51 and 52 to clamp the main rope 12 with the pair of pipe portions 51A and 52A, and pulls the main rope 12 to recover the main rope 12. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6231248 Summary of the Invention [Problem to be solved by the invention]

[0007] However, since the main rope 12 is sandwiched between the pipe sections 51A and 52A from above and below, the above-mentioned clamping jig 50 cannot be removed from the main rope 12 during the operation of retrieving the main rope 12. Therefore, the worker cannot release his / her hands from the clamping jig 50 during the operation of retrieving the main rope 12, which reduces the work efficiency.

[0008] An object of the present invention is to provide a rope clamping jig that can improve the work efficiency when retrieving a main rope during replacement work of an elevator main rope. [Means for solving the problem]

[0009] The rope clamping jig of the present invention is a rope clamping jig that clamps the main rope so that an operator can pull it when retrieving the main rope during replacement work of the main rope of an elevator, and is equipped with a pair of lever arms, a support shaft that supports the pair of lever arms in a rotatable manner, and a pair of clamping pieces that are provided on each of the pair of lever arms and clamp the main rope by closing the pair of lever arms, and at least one of the lever arms is formed with a guide portion that guides the support shaft to the outside of the lever arm.

[0010] In the rope clamping jig of the present invention, an engagement portion is formed in the clamping piece with which the main rope engages when the clamping piece clamps the main rope, and the engagement portion is formed in a V-shape when viewed in cross section perpendicular to the pulling direction of the main rope.

[0011] In the rope clamping jig of the present invention, when viewed in a cross-section parallel to the pulling direction of the main rope, the engaging portion is continuously formed into a shape in which the rear side in the pulling direction is perpendicular to the pulling direction and the rear side in the pulling direction is inclined with respect to the pulling direction. Effect of the Invention

[0012] According to the rope clamping jig of the present invention, it is possible to improve the work efficiency when retrieving the main rope during the replacement work of the main rope of an elevator. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing an elevator in which a rope clamping jig according to an embodiment is used. [Diagram 2] FIG. 1 is a schematic diagram illustrating the replacement work of a main rope of an elevator in which a rope clamping jig according to an embodiment is used. [Diagram 3] FIG. 2 is a plan view showing a clamping jig as an example of an embodiment. [Figure 4] FIG. 2 is a side view showing a clamping jig according to an embodiment; [Diagram 5] This is view A in Figure 3. [Figure 6]FIG. 4 is a cross-sectional view of FIG. [Figure 7] 3C is a cross-sectional view taken along line CC in FIG. [Figure 8] FIG. 13 is a plan view showing a conventional clamping jig. [Figure 9] FIG. 13 is a side view showing a conventional clamping jig. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] An example of an embodiment of the present invention will be described in detail below. In the following description, specific shapes, materials, directions, values, etc. are merely examples for the purpose of facilitating understanding of the present disclosure, and can be appropriately changed according to the application, purpose, specifications, etc.

[0015] An elevator 10 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing the elevator 10.

[0016] As shown in Fig. 1, elevator 10 is a machine room-less elevator, and is a passenger transport device that places passengers in a car 11 and raises and lowers the car 11 in a hoistway 30 according to the passengers' requests. Hoistway 30 is a space that runs vertically through a building, has entrances corresponding to each floor landing of the building, and has a pit 31 at the bottom. In Fig. 1, a lowest floor landing 32 and a top floor landing 33 are shown as the respective floor landings.

[0017] The hoistway 30 accommodates the main rope 12 that moves to raise and lower the car 11, and the counterweight 13 whose weight is set to balance with the car 11. The hoistway 30 also accommodates car hoisting wheels 14, 15 as driven sheaves rotatably supported on the underside of the car 11, return wheels 16, 18 as driven sheaves rotatably suspended and fixed to the ceiling of the hoistway 30 with a gap therebetween, and a weight hoisting wheel 19 as a driven sheave provided at the upper end of the counterweight 13.

[0018] The pit 31 houses a drive sheave 17 that winds up or pays out the main rope 12 to raise and lower the car 11, a hoist 20 that drives the drive sheave, and a control panel 21 that controls the rotation direction and speed of the motor of the hoist 20.

[0019] The main rope 12 is an elevator rope that moves under the drive control of the hoisting machine 20, and the car 11 moves up and down in the hoistway 30 by the movement of the main rope 12. One end of the main rope 12 is fixed to the ceiling side, and is suspended from the car hoisting pulleys 14 and 15, the return pulley 16, the drive sheave 17, the return pulley 18, and the weight hoisting pulley 19, and the other end is fixed to the ceiling side.

[0020] A steel rope made of multiple stranded steel wires is used for the main rope 12. The total length of the main rope 12 is about four times the lifting stroke of the car 11, assuming that the length from the driving sheave 17 to the car hoist 14 or car hoist 15 located on the top floor is the lifting stroke of the car 11. The outer diameter and number of the main ropes 12 are determined by the specifications of the car 11, such as the mass, lifting stroke, and lifting speed.

[0021] The procedure for replacing the main rope 12 in the elevator 10 according to the embodiment will be described with reference to FIG.

[0022] In replacing the main ropes 12, first, one end of each of the chain blocks 35 is fixed to the ceiling wall of the hoistway 30 at a position corresponding to above the car 11. In addition, a work pulley 36 is suspended from the ceiling wall of the hoistway 30 at a position corresponding to above the vicinity of the boarding / alighting entrance of the top floor landing 33. Furthermore, a work pulley 37 is suspended from the ceiling wall of the hoistway 30 at a position corresponding to above the counterweight 13.

[0023] Next, the control panel 21 sets the operation mode of the elevator 10 to the maintenance mode, and moves the car 11 to the top floor so that the counterweight 13 is supported by the pipe support 38. The control panel 21 sets the operation mode of the elevator 10 to the safety mode, and stops driving the motor of the hoist 20 so that the elevator 10 does not move until the safety mode is released. Then, the other ends of the chain blocks 35 are connected to the frame on the ceiling side of the car 11 to fix the position of the car 11. At this time, the main rope 12 suspended in the elevator 10 becomes slightly slack.

[0024] For example, if there are three main ropes 12, the rope replacement work is performed a total of three times for each rope. Since the content of each rope replacement work is the same, the following describes the rope replacement work for replacing one old main rope 12 with one new main rope 12'.

[0025] First, one end of the new main rope 12' is pulled out and passed over the work pulley 37. Then, the other end of the old main rope 12 is cut near the ceiling wall, and the other end of the old main rope 12 and one end of the new main rope 12' are connected with a connecting jig. Next, one end of the old main rope 12 is cut near the ceiling wall, and one end of the old main rope 12 is passed over the work pulley 36, and the worker retrieves the old main rope 12 using the clamping jig 40 described later.

[0026] The old main rope 12 is pulled from the elevator shaft 30 to the top floor landing 33 via the work pulley 36, the car hoisting sheaves 14 and 15, the return sheave 16, the drive sheave 17, the return sheave 18, the weight hoisting sheave 19, and the work pulley 37. Accordingly, the new main rope 12' is suspended from the work pulley 37, the weight hoisting sheave 19, the return sheave 18, the drive sheave 17, the return sheave 16, the car hoisting sheaves 14 and 15, and the work pulley 36.

[0027] A clamping jig 40 as an example of an embodiment will be described with reference to Fig. 3 to Fig. 5. Fig. 3 is a plan view showing the clamping jig 40. Fig. 4 is a side view showing the clamping jig 40. Fig. 5 is a view taken along the arrow A in Fig. 3.

[0028] As described above, the clamping jig 40 is a jig that clamps the old main rope 12 so that a worker can pull the main rope 12 when recovering the old main rope 12 during the replacement work of the main rope 12 of the elevator 10. The clamping jig 40 can improve the work efficiency when recovering the old main rope 12 during the replacement work of the main rope 12 of the elevator 10, as will be described in detail later. In the following, the old main rope 12 will be simply referred to as the main rope 12. In the following, the clamping jig 40 will be described assuming that the direction in which the main rope 12 is clamped and pulled by the clamping jig 40 is the pulling direction, and the main rope 12 is pulled from the back side to the front side in the pulling direction. Also, the direction perpendicular to the above-mentioned pulling direction in the clamping jig 40 is the width direction.

[0029] As shown in Figures 3 and 4, the clamping jig 40 comprises a pair of left and right lever arms 41, 42 whose rear ends are rotatably supported by a support shaft 43, and a pair of clamping pieces 44 that clamp the main rope 12 by closing the pair of lever arms 41, 42 together.

[0030] The lever arm 41 has a rectangular body 41A formed in an L-shape with the short side facing downward in a side view, a connecting portion 41B connecting the left and right bodies 41A to each other, and an upper gripping portion 41C connecting the bodies 41A to each other at the front side and to be gripped by an operator. One of the clamping pieces 44 described later is provided on the connecting portion 41B.

[0031] On the other hand, lever arm 42 has a similar configuration to lever arm 41, and includes rectangular main body 42A formed in an L-shape with the short side facing downward in side view, connecting portion 42B connecting left and right main bodies 42A to each other, and lower gripping portion 42C connecting main bodies 42A to each other on the front side and gripped by an operator. Connecting portion 41B is provided with the other of clamping pieces 44 described later (see FIG. 7).

[0032] The pair of left and right lever arms 41, 42 are pivotally supported at approximately the center of the short sides of the main bodies 41A and 42A by a support shaft 43 so that the L-shaped short sides of the main bodies 41A and 42A face each other. As a result, by bringing the gripping portions 41C, 42C of the pair of lever arms 41, 42 close to each other and closing the left and right lever arms 41, 42 together, the pair of clamping pieces 44 can be closed with a large force by the principle of leverage, and the main rope 12 can be firmly clamped.

[0033] 5, a guide portion 42G that guides the support shaft 43 to the outside of the main body 42A is formed on the main body 42A of the lever arm 42. A guide portion 42G is formed on each of the left and right main bodies 42A. This makes it possible to remove the lever arm 42 from the lever arm 41 and the support shaft 43 by guiding the support shaft 43 from the main body 42A of the lever arm 42 to the outside of the main body 42A.

[0034] As a result, during the operation of recovering the main rope 12, the clamping jig 40 can be removed from the main rope 12 by removing the lever arm 42 of the clamping jig 50 from the lever arm 41 and the support shaft 43. Therefore, the worker does not need to continuously perform the recovery operation using the clamping jig 40 during the operation of recovering the main rope 12, and can release his / her hands from the clamping jig 50, thereby improving the work efficiency.

[0035] The lever arms 41, 42 are metal parts, preferably made of aluminum, which allows the weight of the clamping jig 40 to be reduced and the efficiency of the operation of retrieving the main rope 12 to be improved.

[0036] The support shaft 43 rotatably supports the left and right lever arms 41, 42. More specifically, each of the pair of support shafts 43 rotatably supports approximately the center of the L-shaped short sides of the main bodies 41A, 42A of the left and right lever arms 41, 42 at both ends in the width direction on the rear side of the clamping jig 40. The support shaft 43 may be formed of, for example, a bolt and a nut.

[0037] The support shaft 43 in this example is not present in the center in the width direction of the clamping jig 40. As a result, when the main rope 12 is clamped by the clamping jig 40, the support shaft 43 does not interfere with the main rope 12, and the efficiency of the recovery work of the main rope 12 can be improved.

[0038] The clamping piece 44 is provided at the center in the width direction of the connecting parts 41B, 42B of the left and right lever arms 41, 42, and clamps the main rope 12. An engagement part 44A with which the main rope 12 engages when the clamping piece 44 clamps the main rope 12 is formed on the surface of the clamping piece 44 facing the other clamping piece 44.

[0039] The engaging portion 44A of the clamping piece 44 will be described in detail with reference to Fig. 6 and Fig. 7. Fig. 6 is a cross-sectional view taken along line BB in Fig. 3. Fig. 7 is a cross-sectional view taken along line CC in Fig. 3.

[0040] 6, the engaging portion 44A is formed in a V-shape in a cross section perpendicular to the pulling direction. The depth of the engaging portion 44A is preferably smaller than the radius of the main rope 12 having the smallest diameter among the main ropes 12 recovered by the clamping jig 40.

[0041] As a result, even if the diameters of the main ropes 12 to be recovered by the clamping jig 40 are different, the engaging portions 44A can engage with the main ropes 12 of each diameter, and the main ropes 12 can be grasped by the pair of clamping pieces 44.

[0042] 7, the engaging portion 44A is formed in a sawtooth shape in a cross section parallel to the pulling direction. More specifically, the engaging portion 44A is formed in a plurality of continuous shapes in which the rear side in the pulling direction in a cross section parallel to the pulling direction is formed as an inclined portion 44C that is inclined with respect to the pulling direction, and the front side in the pulling direction is formed as a vertical portion 44D that is approximately perpendicular to the pulling direction. In addition, an acute angle portion 44E is formed by the inclined portion 44C and the vertical portion 44D.

[0043] In other words, in a cross-sectional view parallel to the pulling direction, the engaging portion 44A has a plurality of consecutive triangular shapes each having an acute angle portion 44E whose oblique side is formed on the far side in the pulling direction.

[0044] As a result, when the clamping jig 40 moves in the pulling direction relative to the main rope 12, the acute angle portion 44E gets caught on the main rope 12, making it difficult for the engaging portion 44A to slip relative to the main rope 12, and the clamping piece 44 tightly meshes with the main rope 12. Therefore, when an operator retrieves the main rope 12 with the clamping jig 40, the main rope 12 can be tightly clamped by the clamping jig 40. This improves the efficiency of the work of retrieving the main rope 12.

[0045] Furthermore, when the clamping jig 40 moves relative to the main rope 12 in the direction opposite to the pulling direction (direction from the front side to the back side), the inclined portion 44C of the engaging portion 44A makes it easier for the clamping piece 44 to slip relative to the main rope 12. Therefore, when the worker moves the clamping jig 40 from the front side to the back side along the main rope 12 to clamp the main rope 12 with the clamping jig 40, the clamping jig 40 does not get caught on the main rope 12. This improves the efficiency of the operation of retrieving the main rope 12.

[0046] It should be noted that the present invention is not limited to the above-described embodiment and its modified examples, and various modifications and improvements are possible within the scope of the matters described in the claims of this application. [Explanation of symbols]

[0047] 10 elevator, 11 car, 12 main rope, 12´ new main rope, 13 counterweight, 14 car hoist, 15 car hoist, 16 return wheel, 17 drive sheave, 18 return wheel, 19 weight hoist, 20 hoist, 21 control panel, 30 elevator, 31 pit, 32 bottom floor landing, 33 top floor landing, 35 chain block, 36 work pulley, 37 work pulley, 38 pipe support, 40 clamping jig, 41 lever arm, 41A main body, 41B connecting part, 41C gripping part, 42 lever arm, 42A main body, 42B connecting part, 42C gripping part, 42G guide part, 43 support shaft, 44 clamping piece, 44A engagement part, 44C Inclined portion, 44D vertical portion, 44E acute angle portion, 50 clamping jig, 51 lever arm, 51A pipe portion, 52 support shaft

Claims

1. A rope clamping tool for clamping a main rope of an elevator in order to retrieve the main rope, A pair of lever arms including a pair of strips arranged parallel to the main rope, a gripping portion that connects one end side of each of the strips, is arranged perpendicular to the main rope, and is gripped by an operator, and a pair of connecting shafts that are arranged perpendicular to the main rope and connect the middle portions of each of the strips; A support shaft that is arranged perpendicular to the main rope and that rotatably supports the other end sides of the rectangular portions of the pair of lever arms; A pair of clamping pieces that are provided on the connecting shafts and clamp the main rope by closing the pair of lever arms; Equipped with At least one of the lever arms is removable from the support shaft. Rope clamping tool.

2. The rope clamping jig according to claim 1, The clamping piece is formed with an engagement portion with which the main rope engages when the clamping piece clamps the main rope, The engagement portion is formed in a V-shape in a cross-sectional view perpendicular to the pulling direction of the main rope. Rope clamping tool.

3. The rope clamping jig according to claim 1 or 2, The clamping piece is formed with an engagement portion with which the main rope engages when the clamping piece clamps the main rope, In a cross-sectional view parallel to the pulling direction of the main rope, the engaging portion has a shape in which the front side of the pulling direction is perpendicular to the pulling direction and the rear side of the pulling direction is inclined with respect to the pulling direction. Rope clamping tool.

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