JPH0223187A - Damping device for tail code of elevator - Google Patents

Abstract

PURPOSE:To let the shaking energy of a tail code to be consumed due to contact between the tail code and a wall surface of an elevator tower so as to generate damping effect, by instituting the centering force characteristic of a device unsymmetry in both sides looking from a neutral position, by which the centering force is affected to a supporting point for floating of a floating suspension mechanism. CONSTITUTION:When the shaking of a tail code due to a big earthquake becomes larger than a certain value and operation of an elevator is necessary to be stopped with operation control, the center value of a shaking amplitude of the tail code 4 is moved to the side wall 1 of an elevator tower from a neutral position. By this function, the tail code 4 is contacted with the wall surface 1 of the elevator tower, before the shaking of the tail code 4 becomes large, and the shaking energy of the tail code 4 is consumed by friction and collision. Thus, growth to a large amplitude of the tail code 4 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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. It will be done.

[Conventional technology]

It is necessary to wire control lines, power lines, etc. between the cage that goes up and down and the elevator tower, and these wires are bundled and braided and the cord is connected to the cage for the length of the elevator's ascent and descent stroke plus alpha. It is suspended between towers and is called a tail cord.

This Q) K cord is supported at both ends by the 1st side of the elevator and the tower side fulcrum, and hangs down due to the weight of the tail cord in the narrow and high hoistway. Compared to weight compensating ropes, the tension of the tail cord is weaker, so the natural frequency of oscillation is lower, and when the building shakes due to an earthquake or typhoon, it resonates with the natural frequency of a skyscraper.
Low period.

Easy to swing with large amplitude.

As a result, the tail cord oscillates greatly and collides with the wall of the hoistway, where 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, causing an accident.

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 swinging of the tail cord has attenuated. Since it takes a long time for the vibrations to naturally decay, there is a problem in that the elevator stop time must be set for a correspondingly long time.

Many inventions and ideas have already been filed for solutions to these problems, but one of them is "Horizontal floating of the cage-side fulcrum of ropes and tail cords," which the present inventor previously filed a patent application for. In other words, there is a "supporting method", that is, a "part-side installation method of a floating suspension mechanism of the strip".

Its publication number is as follows.

"Vibration damping device for vertically suspended flexible wires" JP-A-Sho! 57-
124148 "Vibration damping device for hanging strips" Through prototype testing for practical use, this method has the effect of suppressing the response magnification during resonance of the tail cord to a low level, and the effect of suppressing the natural response when the vibration is stopped after an earthquake. It was confirmed that the effect of shortening the decay time was significant.

The inventor of the present invention has repeatedly conducted research and testing with the aim of putting this floating suspension mechanism to practical use, but the collision and friction that occur when the tail cord comes into contact with the wall of the elevator tower play a major role in damping the swinging of the tail cord. I observed what was happening.

When the tail cord collides with the hoistway wall, the collision itself does not consume much kinetic energy, but the collision changes the waveform of the tail cord's deflection, causing the waveform of the low-order mode to disappear and become replaced by a high-order mode. It becomes a small waveform of the next mode.

Since this small fluctuation of the waveform tends to be naturally attenuated by the internal loss of the tail cord itself, the collision between the tail cord and the wall surface is effective in damping the vibration of the tail cord.

However, on the other hand, it is important to ensure the safety of elevator operation that even if the tail cord swings a little, it does not collide with the wall of the elevator tower. From this standpoint, it is preferable that the gap between the tail cord and the wall of the elevator tower be large.

In particular, the part of the tail cord suspended in a U-shape with both ends supported by the car-side fulcrum and the tower-side fulcrum moves up and down at the same speed as the car, so it must not come into contact with the wall of the elevator tower while the elevator is operating. is strongly requested.

For this reason, the cage-side fulcrum of the tail cord is designed to be located as close to the center of the hoistway cross section as possible.

It has been generally thought that a large gap between the tail cord and the shaft wall is preferable because it makes it difficult for the tail cord to collide with equipment attached to the shaft wall.

However, on the other hand, the larger the interval, the larger the swing amplitude of the tail cord during a major earthquake is allowed to grow, and when the tail cord collides with equipment, the impact can damage both. It becomes easier to do.

From the perspective of wasting vibration energy due to friction and collisions, it is preferable for the tail cord to be placed close to the hoistway wall, but this is not desirable from the perspective of safe elevator operation, which is a contradiction that can be avoided. do not have.

[Problem to be solved by the invention]

It is an object of the present invention to solve the above-mentioned contradiction with a simple configuration and to realize a vibration damping device in two-dimensional direction that has sufficient practical effects.

[Means to solve the problem]

The present invention is capable of floating in the horizontal direction and suspends a tail cord on a floating fulcrum on which a resting force acts on the floating fulcrum. When viewed from the neutral position, both sides are asymmetrical, and the vertical wall of the elevator tower is placed beside the tail cord, so that when the amplitude of the tail cord's oscillation becomes large, the oscillation of the tail cord is reduced. The present invention provides a vibration damping device for a tail cord of an elevator, characterized in that the median value of the displacement is configured to automatically move toward the wall surface of the hoistway from the above-mentioned neutral position.

[Effect]

When a building shakes due to an earthquake or typhoon, the tail cord also shakes via the fulcrum, and the shaking of the tail cord gradually increases.

In the event of a weak earthquake, the vibration damping effect of a known floating suspension mechanism is utilized.

At this time, the swinging of the tail cord is suppressed to a minute amplitude around the neutral position, so the elevator can be operated up and down even though the building is shaking.

In the device configured as claimed in the present invention, the righting force characteristics of the device that exerts the righting force on the floating fulcrum of the floating suspension mechanism are asymmetrical.

For this reason, if further progress is made and the swing of the tail cord becomes large enough to exceed a certain level and elevator operation needs to be stopped by controlled operation, the center of the amplitude of the tail cord swing will be automatically adjusted. The value moves from the neutral position towards the wall of the lift tower.

Due to this action, the swinging of the tail cord comes into contact with the wall surface before reaching a large amplitude, and the swinging energy of the tail cord is consumed by friction and collision, thereby preventing the tail cord from growing to a large amplitude.

〔Example〕

In the embodiment shown in FIG. 1, 1 is the shaft wall, 2 is the cage, 3 is the main rope, 4 is the tail cord, 5 is the tower side junction box, 6 is the 1st side junction box, 7
is the steel cord, 8 is the end of the tail cord on the 1st side, 9 is the shuttle, 10 is the roller, 11 is the shuttle guide rail surface,
12 is a shuttle guide rail.

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 7 is a reinforcing material for supporting the weight of the tail cord 4. At point A, the outer covering of the tail cord is torn and the steel cord 7 is exposed.

At the end 8 of the tail cord, this steel cord 7 is connected at point A.
This is what remains after stripping out the cable, and is made up of multiple multi-core cables, which are connected to the first side junction box 5.

The steel cord 7 mentioned above is connected to the shuttle 9 and supports the weight of the tail cord.

Therefore, no tension is applied to the tail cord end 8, and it is left slack.

One end of this tail cord end 8 is fixed by a junction box, but the other end, point A, can swing horizontally.

Therefore, when the tail cord 4 swings horizontally, the tail cord end 8 is elastically deformed.

Specifically, the tail cord end is a multi-core cable made by twisting together a large number of insulated wires, and energy loss due to internal friction during deformation is large. In other words, the hysteresis of the 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 9 is guided by rails via rollers 10.

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 so large that it cannot be illustrated in FIG.

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. The idea is to position the support point at the antinode of the vibration of the rope, rather than at the node, and apply a weak braking force to this antinode position to actively attenuate the vibration.

Next, FIG. 2 is a front view of the locus of the shuttle guide rail surface 11.

Point B is the lowest point of the rail trajectory, and when the tail cord is not swinging, the shuttle, which is the fulcrum of the tail cord, automatically returns to this position due to the restoring force generated by the action of gravity.

This position is the neutral position referred to in this specification.

R-work and R2 are the radius of curvature of the rail trajectory, and have the following relationship.

R> Rz When the swing amplitude of the tail cord is small, the shuttle swings left and right around this neutral position.

When the swing of the tail cord becomes large and it is largely displaced to the right, the roller 10 rides on the side with a small radius of curvature and is therefore subjected to a strong righting force.

On the other hand, it is relatively easy to shift to the left.

Because of this configuration, the swing amplitude center position of the shuttle 11 moves to the left, and the tail cord 4 approaches the shaft wall 1, making it easier to collide with and come into contact with the wall.

As is clear from Figure 1, the tail cord is suspended in the hoistway in a U-shape with one end supported on the section side and the other end on the tower side.
Originally, the left half of the U-shape, the tower side, was naturally close to the wall of the elevator tower.

However, the right half of the U-shape, the cage side, is far away from the wall of the elevator tower.

In the configuration shown in the embodiment, this portion approaches the wall surface of the elevator tower and tends to collide with it.

In the embodiments described above, the shuttle guide surface was made into a downwardly convex curved surface as a means for obtaining the centering force, but a configuration in which the centering force is provided by a spring is also possible. In this case, a spring with nonlinear characteristics may be used.

In addition, in the above embodiment, the floating suspension mechanism of the tail cord is
I have shown what is a dimensional floating method.

Application of the present invention is not limited to one-dimensional floating suspension systems.

It is also possible to apply the present invention to a floating suspension mechanism that floats in orthogonal two-dimensional directions within a horizontal plane.

Further, although the above embodiment shows a case in which a floating suspension mechanism is adopted as a fulcrum on the side of the tail cord, it is also possible to apply the present invention by adopting it on the tower side.

〔Effect of the invention〕

By making the restoring force characteristics of the device that exerts the restoring force on the floating fulcrum of the floating suspension mechanism asymmetrical on both sides when viewed from the neutral position, the tail cord automatically returns to the neutral position when the swing of the tail cord increases beyond a certain level. Since the tail cord approaches the wall of the elevator tower, it comes into contact with the wall, and the swinging energy of the tail cord is consumed by friction and collision, producing a vibration damping effect.

This prevents the swinging amplitude of the tail cord from spreading greatly to both the left and right ends of the elevator tower, and in the event of a large earthquake, the tail cord will not collide with the equipment installed inside the elevator tower with a large amplitude, causing trouble. can be prevented.

From the perspective of wasting vibration energy due to friction and collisions, it is preferable for the tail cord to be placed close to the hoistway wall, but this is undesirable from the perspective of safe elevator operation, which is a contradiction in terms. With the configuration of the invention, the problem can be solved by combining it with an earthquake control system.

As a result, the earthquake control operation device can shorten the downtime even when the operation is stopped.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a front view of the trajectory of the shuttle guide rail. 1... Hoistway wall surface, 2... Cage, 3... Main rope,
4... Tail cord, 5... Section side junction box, 6... Tower side junction box, 7...
・Steel cord, 8...Tail cord end, 9...
- Shuttle, 1o...Roller, 11...Shuttle guide rail surface, 12...Shuttle guide rail. Ip Procedural amendment (method) % formula % Indication of the case Patent application No. 171858/1983 Name of the invention Person who corrects the damping device for the tail cord of an elevator Relationship with the case Applicant 1, Kanda Nishiki-cho, Chiyoda-ku, Tokyo Hitachi Elevator Service Co., Ltd. Representative Hiroo Hirayo

Claims (1)

[Claims] (1) In a device that can float horizontally and suspends the tail cord on a floating fulcrum that exerts a resting force to a neutral position, the righting force characteristics of the device that exerts a righting force on this floating fulcrum are defined as the centering force neutral. A vibration damping device for a tail cord of an elevator, characterized in that both sides are asymmetrical when viewed from the position, and the vertical wall surface of an elevator tower is placed beside the tail cord.