JPH04243787A - Tail cord damping device for elevator - Google Patents

Abstract

PURPOSE:To apply a braking force to the relatively low position of a tail cord, and prevent the damage of the tail cord or the like, even when the upward overrun of a cage takes place. CONSTITUTION:In an elevator tail cord damping device provided on the tower of an elevator to apply a braking force to the curved bottom of a tail cord 9 suspended between the tower and a cage, there is provided a cord 17 with one end connected to the tail cord 9, a cylindrical body 18 so housing the other end of the cord 17 as to be movable and mounted on the aforesaid elevator tower, and a counterweight 18 connected to the other end of the cord 17 for applying tension thereto. The aforesaid construction can be easily applied to an existing elevator without any need of a substantial modification.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tail cord vibration damping device for an elevator.

0002

[Prior Art] Generally, in elevators, a so-called tail cord, which is a cord made by bundling and braiding wiring such as control lines and power lines, is provided between the elevator tower and the car, and the length of the cord is the same as the elevator stroke of the elevator car. It is set to be slightly longer than half. This tail cord is attached to the car and the elevator tower at both ends, and is suspended in a curved manner with the middle portion toward the bottom of the elevator tower. In such a tail cord, the natural frequency during rocking is small because the tension applied to the tail cord is small compared to the main rope or weight compensation rope that is under tension due to a large load. Therefore, when a building shakes due to an earthquake or typhoon, for example, it resonates with the natural frequency of the building and the first-order or higher-order modes, making it likely to shake with a low frequency and large amplitude.As a result, the middle part of the tail cord will move up and down. There is a concern that they may collide with the walls of the tower or become entangled with equipment or members within the tower, and this tendency is particularly noticeable in the case of elevators for skyscrapers. As mentioned above, when the middle part of the tail cord becomes entangled with equipment or members inside the elevator tower, moving the car up and down in that state will damage the tail cord, equipment, and members, leading to a major accident. This is a concern.

FIG. 4 is a vertical cross-sectional view showing the overall configuration of a general elevator, and FIGS. 5 to 7 show the car in FIG. It is a figure explaining the hanging state of a tail cord at a certain time. Generally, as shown in FIG. 4, an elevator consists of a car 2 and a counterweight 3 that move up and down in an elevator tower 1, a main rope 4 to which the car 2 and the counterweight 3 are attached at both ends, and a main rope 4 that is connected to the main rope 4. a hoisting machine 5 around which the intermediate portion is wound;
This hoisting machine 5 is installed in the machine room floor 6 formed at the top of the lifting tower 1 and at the bottom of the lifting tower 1, and the car 2
, buffers 7 and 8 that receive the counterweight 3, a tail cord 9 provided between the car 2 and the elevator tower 1, and a car side support part 10 that is attached to the bottom of the car 2 and supports one end of the tail cord 9. , a tower-side support part 11 that is attached to the wall surface of the elevator tower 1 and supports the other end of the tail cord 9, and both ends are attached between these support parts 10 and 11, and the middle part is the outer layer coating of the tail cord 9. Steel cord 12 inside the material
, a junction box 13 that is attached to the wall at approximately the middle height of the elevator tower 1 and to which the other end of the tail cord 9 is connected, and a control panel 14 that is installed on the floor 6 of the machine room. ing. The steel cord 12 described above is a strength member for supporting the weight of the tail cord 9, and although not shown, is housed in the outer covering material of the tail cord 9 together with the electric wire. Further, electric wires (not shown) are wired from the above-mentioned junction box 13 to the machine room where the control panel 14 is installed. For example, in the case of an elevator for a high-rise building, the outer covering material of the tail cord 9 is cut out at point A on the other end side, and the other end side of the steel cord 12 is stretched out to the outside of the tail cord 9 to support the tower side. The weight of the tail cord 9 is often supported by tying it to the section 11. On the other hand, in the case of elevators for medium- and low-rise buildings, the tail cord 9 is wrapped around the tower side support part 11 and tied with the outer covering material still attached.
Sometimes it supports its own weight. In addition, here, we are focusing on the dynamic behavior of the tail cord 9's swing, and the tower side support part 11 of the tail cord 9 substantially supports the weight of the tail cord 9. In this example, it is assumed that the tail cord 9 is not restrained from swinging in the horizontal plane. Furthermore, when the above-mentioned car 2 ascends in the elevator tower 1 at high speed, it may overrun the top floor position, so as a safety measure to decelerate and stop the car 2, the so-called top clearance is set above the top floor position. It is set in.

As described above, the tail cord 9 is suspended in a U-shape at the middle part by supporting both ends, and the amplitude of vibration during rocking is maximum at the curved bottom part of the U-shape. . It can be confirmed by a simple experiment that the amplitude of vibration increases as the distance from the support point increases. The reason for this can be easily understood theoretically by recognizing the vibration during rocking as a propagation phenomenon of wave energy. In addition, the wave propagation speed of wave energy is tail code 9
Since the wavelength is approximately proportional to the square root of the tension in the strip, the wavelength is also proportional to the square root of the tension. When the tail cord 9 is suspended in the vertical direction and only its own weight acts, the tension is maximum at the support parts 10 and 11, and on the other hand,
The tension is zero at the U-shaped curved bottom. Therefore, the wavelength is large at the support point, but becomes extremely small at the U-shaped curved bottom. Since the wave energy of each propagating wave does not change during the propagation process, for example, as the wavelength becomes shorter, the amplitude increases, and the amplitude of the deflection of the tail cord 9 reaches its maximum at the bottom of the U-shaped curve. Become. For this reason, when attempting to suppress vibration by directly applying a braking force to the tail cord 9, it is more advantageous to do so at a position where the amplitude of the deflection of the tail cord 9 is large than at a position where the amplitude is small. For example, as shown in FIG. 5, when the car 2 is in the middle position of its lifting stroke, it is advantageous to apply the braking force to a location B1 located below the tower support 11 by a distance d1. Similarly, Figure 6
When the car 2 is at the top floor position as shown in FIG. Further, as shown in FIG. 7, when the car 2 overruns in the upward direction and the counterweight 3 hits the buffer 8, the tail cord 9 is lifted in a J-shape. At this time, in order to prevent excessive tension from acting between the support part 11 and the tail cord 9, an allowance is provided for the length of the tail cord 9, and the height position of the support part 11 is set slightly higher. It is desirable to apply the braking force to a location B3 located below the side support portion 11 by a distance d3. Here, there is a relationship of dimension d1>dimension d2>dimension d3. In addition, when trying to connect the tail cord vibration damping device that exerts a braking force on the tail cord 9 directly to the point B3 of the tail cord 9, even if the car 2 overruns, the above point B3
However, when the car 2 descends to the position shown in FIG. There is a problem in that the damping effect for code 9 is impaired.

[0005] Conventionally, for example, Japanese Patent Application No. 63-2548
No. 15, as shown in Japanese Unexamined Patent Publication No. 2-106587,
The height position of the tower side support part of the tail cord is set sufficiently higher than the height position where the tail cord can be restrained and supported on the tower side,
The tail cord vibration damper of an elevator is equipped with a device that makes the rocking displacement of the tail cord relatively large in the vicinity of this restraint-supportable height position, and that applies a relatively weak braking force to the rocking motion. A device has been proposed by the applicant.

[0006]

[Problems to be Solved by the Invention] However, in the above-described conventional tail cord vibration damping device for an elevator, the height position of the tower side support portion of the tail cord is set to be sufficiently higher than the height position where the tail cord can be restrained and supported on the tower side. Therefore, depending on various conditions such as the structure of the building and the overall length of the elevator tower, the height position of the tower side support part of the tail cord may be set as shown above. The problem was that it was difficult to do so. In particular, since application to existing elevators requires large-scale modification, it has not been possible to use the conventional tail cord vibration damping device for such existing elevators.

The present invention has been made in view of the actual situation in the prior art, and its purpose is to be able to apply braking force to a position relatively below the tail cord, and to prevent the car from moving above the top floor position. To provide a tail cord vibration damping device for an elevator capable of preventing damage to the tail cord even in the case of overrun.

[0008]

[Means for Solving the Problems] In order to achieve this object, the present invention provides a tail cord of an elevator that is installed in a lifting tower of an elevator and applies a braking force to a tail cord that is suspended between the elevator tower and a car. In the cord vibration damping device, a cable body whose one end is connected to the tail cord, a storage body which movably stores the other end side of the cable body and is attached to the elevator tower, and the cable body The cable is connected to the other end and includes an operating body that applies tension to the cable body.

[0009]

[Operation] Since the present invention is constructed as described above, when the car is between the lowest floor position and the highest floor position in the elevator tower, the cable body connected to the tail cord is connected to the cable body other than the cable body. The end side is stored in the storage body, and the cable body brakes the tail cord under tension applied by the operating body. If the car overruns further above the top floor position in the elevator tower and most of the tail cord is pulled up, the cable connected to the tail cord is also pulled up against the above tension. It is pulled out from the storage body. Thereby, braking force can be applied to a position relatively below the tail cord, and even if the car overruns above the top floor position, damage to the tail cord etc. can be prevented.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tail cord vibration damping device for an elevator according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of the tail cord vibration damping device for an elevator according to the present invention, and FIG. 2 is an explanatory diagram of the tail cord vibration damping device of FIG. 1 viewed from the direction indicated by arrow X0. Note that in FIGS. 1 and 2, parts equivalent to those shown in FIG. 4 described above are given the same reference numerals. That is, 9 is a tail cord, 11 is a tower side support part, and 12 is a steel cord.

The tail cord vibration damping device of this embodiment shown in FIG. an actuating body, for example, the weight 18, and the above-mentioned FIG.
A storage body, for example, a cylindrical body 19, which is erected in the elevator tower 1 and movably stores the other end of the cable body 17, and this cylindrical body 19.
It is provided with a bracket 20 for attaching to the lifting tower 1, and a sliding plate 21 which is fixed to the lifting tower 1 and engages with the tail cord 9. The end of the steel cord 12 is connected to the tail cord 9
The round bar 11a of the tower side support part 11 is taken out at point A.
At the same time, it is clamped with a clip 15. The above tail cord 9 is connected to the tower side support part 11
One end of the string 17 is connected at a location B2 which is located below by a predetermined dimension, for example, the dimension d2 shown in FIG. has been done. A weight 18 is inserted into the cylindrical body 19, and the weight 18 is configured to slide vertically within the cylindrical body 19, and the frictional force against the sliding movement of the weight 18 and the frictional force during sliding. They are made of vinyl chloride, for example, in order to reduce noise. The upper end of this cylinder 19 is arranged slightly below the upper end of the sliding plate 21, as shown in FIG. The above part B2 is
As shown in FIG. 6, it is located near the curved bottom of the tail cord 9 that is formed when the car 2 is at an intermediate position on the elevator tower 1.

In this first embodiment, the car 2 shown in FIG. If there is,
As shown in FIG. 2, the part B2 of the tail cord 9
The string 17 is placed at the same height as the upper end of the cylinder body 19 and is connected to the above-mentioned point B2. It is housed within the body 19. Since tension is applied to this string 17 by a weight 18, the mantle 16 of the tail cord 9 is drawn and pressed against the sliding plate 21. Then, the tail cord 9 is connected to the sliding plate 21.
When swinging in the longitudinal direction, that is, in the x-axis direction in Fig. 1,
Since the mantle 16 rubs against the sliding plate 21, the tail cord 9 is braked by the frictional resistance between the mantle 16 and the sliding plate 21. Next, when the tail cord 9 swings in the front-rear direction with respect to the sliding plate 21, that is, in the y-axis direction in FIG. As a result, the tail cord 9 is braked. In the unlikely event that the value of the frictional resistance as described above is excessive, it will be impossible for the mantle body 16 to move even if the tail cord 9 swings, that is, it will be impossible to brake the tail cord 9. become unable. In order to obtain a predetermined value of such frictional resistance, the weight of the weight 18 is set to an appropriate value. Similarly, as shown in FIG.
Even when the vehicle is at the top floor of the elevator tower 1, the tail cord 9 is braked as described above. On the other hand, if the car 2 overruns further above the top floor position, most of the tail cord 9 is pulled up as shown in FIG.
Since point B2 also rises in the z-axis direction in FIG. As a result, the string 17 is pulled up and let out from within the cylindrical body 19, thereby preventing damage to the tail cord 9 and the like. In the event that the string 17 breaks, the weight 18 will be subject to air resistance as if it were a piston in a cylinder, so the falling speed of the weight 18 is limited. This will prevent it from falling.

In the first embodiment configured as described above, braking force can be applied to a relatively lower position of the tail cord 9, that is, a location B2 that is lower than the tower side support part 11 by the dimension d2, and Even if the car 2 overruns above the top floor position, damage to the tail cord 9 etc. can be prevented because the above-mentioned portion B2 can be raised. In this embodiment, the location B2 is provided below the tower side support part 11 by the dimension d2, but the present invention is not limited to this, and the location with the string 17 is provided below the dimension d1 shown in FIG. It can be provided anywhere up to the dimension d2 shown in FIG. If the part with the string 17 is provided further below, the vibration damping effect of the tail cord 9 can be improved, but when the part of the tail cord 9 is set further below in this way, It is necessary to set the let-out length of the string 17 relatively large. For example, when connecting the string 17 at point B1 shown in FIG. Because of this, the durability of the string 17 must be improved. On the other hand, as illustrated in this embodiment, when the string 17 is connected at the location B2 shown in FIG. The durability can be set relatively low. In this case, the question is whether the above set dimensions are sufficient to obtain a good vibration damping effect, but since ordinary high-speed elevators have sufficient top clearance against overruns, It can be said that there is virtually no problem even if the dimension is set to d2. Further, in this embodiment, a weight 18 is provided as an operating body that applies tension to the string 17, but instead of this weight 18, a take-up reel or a take-up spring may be provided. Further, in this embodiment, only one tail cord vibration damping device is provided, but a plurality of tail cord vibration damping devices may be provided along the tail cord 9 if necessary. When a plurality of tail cord vibration damping devices are installed together in this way, even if the tail cord 9 is pulled up greatly, at least some of the strings 17 of the tail cord vibration damping devices are not let out to a large extent, so that the tail Braking of code 9 can be performed more reliably.

FIG. 3 is a perspective view showing a second embodiment of the tail cord vibration damping device for an elevator according to the present invention. Note that in FIG. 3, parts equivalent to those shown in FIG. 1 described above are given the same reference numerals. That is, 9 is a tail cord, 11 is a tower side support part, 12 is a steel cord, 15 is a clip,
16 is a mantle, 17 is a string, 18 is a cylinder, and 19 is a weight.

In this embodiment shown in FIG. 3, the lower end of the cylindrical body 18 is rotatably supported by a bracket 23 whose both ends are fixed to the lifting tower 1 shown in FIG. 4 described above. This cylinder 18
An air damper 24 having an air chamber configured in a bellows shape is provided at the upper end of the cylinder 18, which is arranged along the rotational direction of the cylinder 18, that is, along the x-axis direction in FIG. The tip of this air damper 24 faces a bracket 25 fixed to the elevator tower 1, and a small breathing hole (not shown) is formed at the end of the air chamber of this air damper 24.

Even in this second embodiment, if the car 2 shown in FIG. 4 is located between the bottom floor and the top floor of the elevator tower 1,
The tail cord 9 is braked in the same manner as in the first embodiment described above. And in this example,
When the tail cord 9 swings in the longitudinal direction of the bracket 23, that is, in the x-axis direction in FIG. 3, the cylindrical body 18 rotates about its lower end. At this time, since the tip of the air damper 24 hits the bracket 25, the air pressure inside the air damper 24 changes as the air damper 24 expands and contracts, and as a result, air flows in and out through the breathing hole of the air damper 24. By consuming the swinging energy of the tail cord 9, the tail cord 9 is braked.

The second embodiment configured as described above can also provide the same effects as the first embodiment described above. Furthermore, in this second embodiment, the tail cord 9
When the tail cord 9 swings in the x-axis direction in FIG. 3, the air damper 24 can dampen the tail cord 9 more effectively.

[0018]

As the present invention is constructed as described above, it is possible to apply a braking force to a relatively lower position of the tail cord, and even when the car overruns above the top floor position, the tail cord can be easily controlled. It is possible to prevent damage to the cords, etc., and there is no need to set the height position of the tower side support part of the tail cord sufficiently higher than the height position at which the tail cord can be restrained and supported on the tower side. The height position of the tower side support portion of the tail cord can be set regardless of various conditions such as the structure of the tower and the overall length of the elevator tower. Further, it can be easily applied to existing elevators without requiring large-scale modification.

[Brief explanation of the drawing]

FIG. 1: A first tail cord vibration damping device for an elevator according to the present invention.
It is a perspective view showing an example of this.

FIG. 2 is an explanatory diagram of the tail cord vibration damping device of FIG. 1 viewed from the direction indicated by arrow X0.

FIG. 3: A second tail cord vibration damping device for an elevator according to the present invention.
It is a perspective view showing an example of this.

FIG. 4 is a longitudinal sectional view showing the overall configuration of a general elevator.

FIG. 5 is a diagram illustrating a suspended state of the tail cord when the car in FIG. 4 is at an intermediate height position in its lifting/lowering stroke.

FIG. 6 is a diagram illustrating a suspended state of the tail cord when the car in FIG. 4 is at the top floor position.

7 is a diagram illustrating a suspended state of the tail cord when the car shown in FIG. 4 is in an overrun state in an upward direction; FIG.

[Explanation of symbols]

9 Tail code 11 Tower side support part 16 Mantle body 17 String (cord body) 18 Weight (operating body) 19 Cylindrical body (storage body) 21　Suribane 23, 25 bracket 24 Air damper

Claims (1)

[Claims] Claim 1: A tail cord vibration damping device for an elevator, which is installed in a lifting tower of an elevator and exerts a braking force on a tail cord suspended between the elevator tower and a car, one end of which is connected to the tail cord. A storage body movably stores a cable body and the other end of the cable body, and is connected to a storage body attached to the elevator tower and the other end of the cable body, and applies tension to the cable body. A tail cord vibration damping device for an elevator, characterized by comprising an operating body.