JPH0223186A - Damping device for tail code of elevator - Google Patents

Abstract

PURPOSE:To make it possible to effectively perform damping in the two dimensional direction by providing a floating suspension mechanism having damping function only in the one dimensional direction, and in addition by contactedly sliding a tail code on slide protecting fittings for damping in the direction crossing this direction. CONSTITUTION:When a building is shaked by an earthquake or a typhoon, a tail code 4 is shaked through a supporting point and its shaking grows gradually. At this time, the shaking in the Y-axis direction is effectively damped with a floating suspension mechanism 7 provided on the cage 2 side. Besides, shaking energy in the X-axis direction is consumed by frictional resistance of contacted sliding between slide protecting fittings 13 and the tail code, 4 and sufficient damping can be obtained in practical use.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration damping device for a tail cord of an elevator.

However, the term "elevator" as used in this specification is not limited to elevators in the narrow sense stipulated by construction-related laws and regulations, but refers to all equipment in which cages are raised and lowered vertically, and naturally includes mine lifts, etc. .

[Conventional technology]

It is necessary to wire control cables, power lines, etc. between the cage that goes up and down and the elevator tower, and the cables made by bundling and braiding these wires are connected to the cage for the length of the elevator's lifting stroke plus alpha. It is suspended between the tower and the tower and is called the tail cord.

This tail cord is supported at both ends by the cage side of the elevator and the tower side fulcrum, and hangs down due to its own weight in the narrow and high hoistway, but the main rope and weight compensation are held taut at both ends with strong tension. Since the tension of the tail cord is weaker than that of a rope, the natural frequency of the oscillation is low, and when the building shakes due to an earthquake or typhoon, it resonates with the natural frequency of a skyscraper, and it tends to sway with low frequency and large amplitude.

As a result, the tail cord oscillates greatly and collides with the wall of the hoistway, and at this time it tends to become entangled with other equipment or members, and there is a problem in that the tail cord is likely to operate the elevator with the tail cord entangled and easily raise itself up.

In order to prevent this accident, a controlled operation system is generally adopted in which elevator operation is stopped from the time an earthquake occurs until the vibration of the tail cord has attenuated. Since it takes a long time for the natural decay of the elevator, there is a problem in that the stopping time of the elevator must be set to be correspondingly long.

Many inventions and ideas have already been filed for solutions to these problems, but one of them is the invention for which the present inventor previously filed a patent application entitled "Horizontal floating of the cage side fulcrum of ropes and tail cords". There is a support method, that is, a method for installing a floating suspension mechanism on the side of the strip.

Its publication number is as follows.

``Vibration damping device using vertically suspended flexible wires'' ``Vibration damping device using suspended strips'' This method has been tested for practical use to demonstrate its effectiveness in suppressing the response magnification during resonance of the tail cord to a low level and its effectiveness in suppressing earthquakes. Although it was confirmed that the effect of shortening the natural decay time when excitation was stopped after the excitation was completed was significant, it was also found that there were the following drawbacks.

1. Building vibrations caused by earthquakes, typhoons, etc. can occur in any direction within the horizontal plane, so in response to this, the support point on the gutter side of the tail cord should be aligned with the X-axis orthogonal within the horizontal plane.

If an attempt is made to support the cage so that it can swing in both directions of the Y axis, the mechanism for this will become complicated, and if this mechanism is attached to the cage, the weight of the cage that moves up and down will increase.

2. As a countermeasure to the above problem, there is a plan to adopt a floating suspension mechanism at the support point on the tower side of the tail cord, but the mechanism for floatingly suspending the support point on the tower side in a two-dimensional direction tends to be complicated.

On the other hand, the floating suspension mechanism at the support point on the tower side must be installed in a narrow space surrounded by the elevator trajectory of the cage and the inner wall surface of the elevator tower, and a complicated mechanism for floating suspension in two dimensions cannot be accommodated. It is often difficult.

3. As a recent trend, ultra-high speed elm/<-'a(7)II
It is common to attach streamlined capsules to both the top and bottom ends of the cage to prevent L-cutting noise, but the tailcoat's cage-side fulcrum can be swung in both directions of the orthogonal X- and Y-axes in the horizontal plane. If a large hole is not made in the part where the tail cord penetrates the capsule, the tail cord and capsule will collide if the tail cord swings. Providing a large hole in the capsule is not desirable because it not only reduces the soundproofing effect of the capsule but also makes the wind noise even louder due to the whistling effect.

These problems can be solved by reducing the swingable direction of the floating suspension mechanism of the tail cord from two dimensions to one dimension, but vibration control in the two-dimensional directions of both the X and Y axes cannot be achieved as is.

Under these circumstances, the inventor of the present invention conducted repeated research and experiments with the aim of putting a floating rack mechanism into practical use.However, in order to damp the vibration of the tail cord, it is difficult to suppress the vibration when the tail cord and the wall of the elevator tower slide observed that friction plays a major role.

[Problem to be solved by the invention]

The present invention utilizes the advantage of a simple floating suspension mechanism that only has a one-dimensional vibration damping function, and damps vibrations in a direction perpendicular to this by the sliding contact between the tail cord and the wall surface. This was done with the aim of obtaining a structure that can effectively suppress vibrations in practice.

[Means to solve the problem]

The present invention has a structure in which the fulcrum of the tail cord on the cage side is suspended horizontally by a floating suspension mechanism and a restoring force is applied to the tail cord in parallel to the inner slope of the elevator tower side in a plan view. Equipped with sliding protection equipment.

The direction parallel to this sliding protector is the X-axis, and the direction of the straight line connecting the fulcrum on the elevator tower side and the fulcrum on the cage side is the Y-axis. The arrangement of the fulcrum is determined, a floating suspension device that swings only in the Y-axis direction is provided on the main side, and a tail cord is suspended from the fulcrum on the tower side;
This invention provides a vibration damping device for a tail cord of an elevator, characterized in that the sliding protector is arranged so that the tail cord is in contact with the tail cord without swinging in the Y-axis direction. [Function] Earthquakes and typhoons When the building shakes, the tail cord also shakes via the fulcrum, and the shaking of the tail cord gradually increases.

In the device configured as claimed in the present invention, the swinging motion in the Y-axis direction is effectively suppressed by the floating suspension mechanism provided on the cage side.

The swinging energy in the Y-axis direction is consumed by the frictional resistance of sliding contact between the sliding protector and the tail cord, and the vibration is suppressed sufficiently for practical use.

〔Example〕

In the embodiment shown in the figure, 1 is a lifting tower, 2 is a cage, 3 is a main rope, 4 is a tail cord, 5 is a tower side junction box, 6 is a cage side junction box, 7 is a steel cord, and 8 is a cage side tail Cord end, 9 is shuttle,
10 is a roller, 11 is a shuttle guide rail surface, 12 is a shuttle guide rail, and 13 is a tail cord sliding protector.

A tail cord generally has a structure in which a plurality of multicore cables and a plurality of steel cords are included in an exterior sheathing material.

The steel cord is a reinforcement material to support the weight of the tail cord.

On the tower side, the outer covering of the tail cord was torn at point A, and the steel cord was exposed.

The end portion 7 of the tail cord is the remainder after stripping off the steel cord 7 at point A, and is made up of a plurality of multicore cables, which are connected to the junction box 5.

The above steel cord is connected to the shuttle and supports the weight of the tail cord.

Therefore, no tension is applied to the end of the tail cord, and it is left slack.

One end of this tail cord is fixed with a junction box, but the other end, point A, can swing horizontally.

Therefore, when the tail cord 4 swings horizontally, the end portion of the tail cord is elastically deformed.

Specifically, the tail cord end is a multi-core cable made by twisting a large number of insulated wires together, and the energy loss due to internal friction during deformation is large.In other words, the hysteresis of deformation resistance is large.

As described above, when the tail cord makes a swinging motion, the tail cord end exerts a braking force against this motion, thereby consuming the vibration energy.

Furthermore, the elasticity of the end of the tail cord also acts to exert a restoring force against the horizontal swinging displacement at point A.

The shuttle is guided by rails via rollers.

The longitudinal direction of the rail is arranged in the X-axis direction in the figure, that is, in a direction parallel to the wall surface of the elevator tower.

The longitudinal direction of the rail is arranged in the Y-axis direction in the figure, that is, in a direction perpendicular to the wall surface of the elevator tower.

The guide rail surface is not horizontal in the longitudinal direction. The center portion is slightly concave, and the force of gravity acting on the tail cord generates a force to return the tail cord to the center portion, that is, a restoring force, so the center portion becomes the neutral position of rocking.

The guide rail surface has a downwardly convex arc shape, but the radius of curvature of this arc is extremely large, so it cannot be shown.

The above configuration, similar to the previously filed known example, uses the support point of the rope and tail cord as a floating fulcrum instead of a fixed fulcrum, so that even if the basket swings, this swing will not be directly transmitted to the ropes. This idea is based on the idea of locating the support point at the antinode of the vibration of the rope, rather than at the node, and by applying a weak braking force to this antinode position, the idea is to actively attenuate the vibration.

Generating an appropriate braking force is an essential requirement for exhibiting the vibration damping effect of the present invention, but the means for generating the braking force is based on the frictional resistance of the floating suspension mechanism itself and the deformation of the tail cord. Since the actual internal loss may be sufficient, it is not a requirement of the present invention to provide an independent component called a damper.

In the above embodiment, a member made of a rod bent into a U-shape was attached to the wall of the hoistway as a sliding protector. The bigger you go, the bigger you go.

With such a configuration, it is possible to correct the fact that the contact force between the tail cord and the sliding protector becomes smaller below the tail cord.

In the scope of the present invention, it is a constituent feature that the sliding protector is arranged so as to be in contact with the tail cord suspended from the tower-side fulcrum.

This does not necessarily mean a geometrical condition that the tower side protector is located vertically below the tower side fulcrum of the tail cord.

The significance lies in the presence or absence of a mechanical effect in which a frictional force is exerted in the X-axis direction when the tail cord lightly slides into contact with the protective equipment and when the tail cord swings.

If a tail cord with high bending rigidity is used, the lower part of the U-shape will swell, resulting in an inverted Ω-shape, that is, an octopus pot shape.

In this case, it is clear that the perpendicular line hanging vertically from the tower-side fulcrum of the tail cord does not necessarily have to geometrically interfere with the sliding protector.

In the embodiment, a member made by bending a rod into a U-shape is attached to the wall on the tower side as the sliding protector, but this may also be the wall of the hoistway itself.

〔Effect of the invention〕

In the configuration shown in the example, even if only the one-dimensional floating suspension mechanism is used, the friction between the tail cord and the sliding protector can be used to
This has the effect of realizing a vibration damping effect in two-dimensional directions.

This improves the problem of the floating suspension mechanism that acts in two dimensions as mentioned at the beginning, and brings about the following effects.

1) The horizontal swinging suspension mechanism of the tail cord attached to the cage side is configured to work only in one dimension rather than two-dimensionally in the horizontal plane, so the swinging suspension mechanism can be avoided from becoming complicated. It is possible to avoid an increase in the weight of the basket that is lifted and lowered.

2) It is necessary to design the suspension mechanism for horizontal swinging of the tail cord and its support frame with sufficient rigidity to avoid tilting due to distortion and maintain accurate horizontal accuracy at all times, but compared to two-dimensional swinging, It is easy to design a one-dimensional swing force type that satisfies this condition.

3) The tail cord penetration hole provided in the capsule to prevent wind noise does not need to be a round hole with a large diameter because the direction of deflection of the tail cord is restricted to one dimension, and it can be a slit-shaped hole, which prevents wind noise. function will not deteriorate much.

[Brief explanation of the drawing]

The figure is a perspective view showing an embodiment of the present invention. 1... Lifting tower, 2... Basket, 3... Main rope, 4...
...Tail cord, 5...Tower side junction box, 6...1■ side junction box, 7...Steel coat, 8...1 side tail cord end, 9...
- Shuttle, 10. Roller, 11. Shuttle guide rail surface, 12.. Shuttle guide rail, 13.. Tail cord sliding protector.

Claims (1)

[Claims] (1) In the present invention, the fulcrum of the tail cord on the cage side is suspended horizontally by a floating suspension mechanism, and a righting force is applied, so that the fulcrum of the tail cord is parallel to the inner slope of the elevator tower side in a plan view. When a tail cord sliding protector is provided, the direction parallel to this sliding protector is the X-axis, and the direction of the straight line connecting the fulcrum of the tail cord on the tower side and the fulcrum on the cage side is the Y-axis. The fulcrums are arranged so that the X- and Y-axes are perpendicular, and a floating suspension device that swings only in the Y-axis direction is installed on the cage side, and a tail cord and sliding protector are suspended from the fulcrum on the tower side. A vibration damping device for a tail cord of an elevator, characterized in that the tail cord and the tail cord are arranged so as to be in contact with each other in a state where the tail cord is not swinging in the Y-axis direction.