JPH05201652A - Liquid damper for elevator - Google Patents

Abstract

PURPOSE:To provide a liquid damper for an elevator which maintains the damper effect similar to that in the installation initial state by installing a cover having the structure for preventing the flow outside a cylinder of the liquid which is caught by the connecting rod of a piston and adheres. CONSTITUTION:A recessed part 24 is formed on a cover 21 which covers so that dust, etc., does not intrude into a cylinder 11. A liquid 13 which is caught by a connecting rod 15 fixed on a piston 14 and flows upward from the cover 21 is allowed to stay in the recessed part 24, and the outside flow-out is prevented, and the liquid is returned into the cylinder 11 from a through-hole 26 in which the connecting rod 15 at the center of the cover 21 is freely inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator liquid damper, and more particularly, to a vibration of a rope holding device for holding a main rope for suspending a lifting body such as an elevator car.
The present invention relates to an improvement in the structure of a liquid damper lid that is damped by the viscosity of a liquid.

[0002]

2. Description of the Related Art As a conventional rope holding device of this type,
The technique disclosed in JP-A-57-44593 can be mentioned.

FIG. 6 is a sectional view showing a state in which a conventional liquid damper for an elevator is attached to a rope holding device disclosed in Japanese Patent Publication No. 57-44593. In the figure, 1a is a pair of upper beams arranged in a car as a lifting body of an elevator, 2 is a rope stopper plate fixed between the lower surfaces of both upper beams 1a, and 2a is a rope stopper plate 2. Through holes 3 formed at appropriate intervals, an upper spring receiver in which a protrusion on the upper surface is loosely fitted in the through hole 2 a, 4 is a lower spring receiver arranged to face the upper spring receiver 3, and 5 is an upper spring receiver 3 and A compression coil spring as a compression elastic body in which the upper and lower ends are loosely fitted between the opposing protrusions of the lower spring receiver 4, 6 is a support plate disposed in contact with the lower surface of the lower spring receiver 4, and 6a is a support. Through holes formed in the plate 6 at positions communicating with the central hole of the upper spring receiver 3 and the central hole of the lower spring receiver 4, and 7 is the upper spring receiver 3
, A compression coil spring 5, a lower spring holder 4, and a well-known rope holder 8 loosely inserted in the through hole 6a of the support plate 6.
Is a nut screwed to the male screw at the lower end of the rope holder 7, and 9 is held at the upper end of the rope holder 7 at one end and is wound around a drive sheave (not shown) to be the car. It is the main rope of the elevator that suspends and supports.

Reference numeral 10 is a liquid damper, and 11 is a cylinder of a liquid damper having a tubular shape extending in the vertical direction, which is the direction of expansion and contraction of the compression coil spring 5. The cylinder 11 has a support plate 6 with an opening portion arranged above. It has been placed. 12 is a nut for fixing the cylinder 11 to the support plate 6, 13 is the cylinder 1
1 is a high-viscosity liquid, 14 is a piston fitted into the cylinder 11 through an appropriate gap, 14a is the upper surface of the piston 14, 14b is the lower surface of the piston 14, and 15 is projected from the upper surface 14a of the piston 14. The connecting rod has a diameter smaller than the diameter of the piston 14. The connecting rod 15 is provided on the lower surface 1 of the piston 14 when the compression coil spring 5 is contracted.
4b is adjusted so as not to collide with the bottom of the cylinder 11 and the upper surface 14a of the piston 14 is not exposed above the liquid 13 when the compression coil spring 5 is extended. It is screwed and fixed to the plate 2. 16 is a flat lid that covers the opening of the cylinder 11;
Reference numeral a is a through hole formed at the center of the lid 16 for loosely inserting the connecting rod 15.

Next, the operation of the conventional liquid damper for an elevator constructed as described above will be described. The car is suspended and supported by the main rope 9 via the compression coil spring 5, the upper spring receiver 3, the lower spring receiver 4, and the rope holder 7. Further, the compression coil spring 5 and the liquid damper 10 prevent the vibration generated by the elevator drive device (not shown) from being transmitted to the car via the main rope 9. Since the length of the connecting rod 15 of the liquid damper 10 is adjusted to the above-mentioned predetermined length, even when there is no load in the car and the compression coil spring 5 reaches the maximum length, the upper surface 14a of the piston 14 is in the liquid state. It is not exposed above 13. Further, even when the maximum load weight within the allowable load range is loaded on the car and the compression coil spring 5 has the minimum length, the lower surface 14b of the piston 14 does not collide with the bottom of the cylinder 11. Therefore, when the compression coil spring 5 expands and contracts due to the weight of the load on the car, the piston 14 smoothly moves up and down according to the expansion and contraction amount of the compression coil spring 5. Further, the opening of the cylinder 11 has a through hole 1 into which the connecting rod 15 is loosely inserted.
Since the flat lid 16 having 6a is provided, foreign matter such as dust does not enter the cylinder 11.

[0006]

Since the conventional liquid damper of the elevator is constructed as described above, when the maximum load weight is loaded in the car, the piston 14 causes the bottom of the cylinder 11 in the cylinder 11 due to its weight. Descent close. Also,
When the car is moved up and down and all the loaded items are unloaded from the car at the destination floor, the piston 14 instantly rises in the cylinder 11 by the pushing force of the compression coil spring 5. At this time, the high-viscosity liquid 13 in the cylinder 11 is entangled and attached to the connecting rod 15, passes through the through hole 16 a of the lid 16, and the cylinder 1
Go out of 1. Next, when the maximum loaded weight is newly loaded in the car within a short time, the piston 14 descends again inside the cylinder 11 to near the bottom due to the weight. At this time, since the compression coil spring 5 is not guided in the lateral direction, the compression coil spring 5 bends in the vertical direction due to the loading of the load in the car, and at the same time, the compression coil spring 5 also deflects in the lateral direction to cause a positional deviation, and together with the support plate 6, the cylinder 11 To move horizontally. Therefore, the connecting rod 15 moves downward while contacting the peripheral edge of the through hole 16a of the lid 16, as shown by the chain double-dashed line in FIG. As a result, the liquid 13 entangled and attached to the connecting rod 15 is scraped off by the peripheral edge of the through hole 16a of the lid 16 and stays on the upper surface of the lid 16, and most of the liquid 13a travels along the outer periphery of the cylinder 11. It will fall. As a result, when the elevator is operated in a short time and the load is moved up and down by the car, the liquid 13 in the cylinder 11 flows out of the cylinder 11 and its amount decreases below the initial set amount, and finally There is a possibility that the piston 14 is exposed above the liquid surface of the liquid 13 and the damper effect cannot be obtained.

In view of this, the present invention provides a liquid damper for an elevator capable of maintaining the same damper effect as in the initial installation state by obtaining a lid having a structure in which the liquid entangled with the piston connecting rod does not flow out of the cylinder. Is to be provided.

[0008]

According to a first aspect of the present invention, there is provided a liquid damper for an elevator, wherein a cylinder having an opening at an upper end for enclosing a liquid is fixed to a support plate in parallel with a direction in which a compression elastic body extends and contracts. At the same time, a piston is fitted in the cylinder, the upper end of a connecting rod having a diameter smaller than that of the piston is fixed to the lifting body, the lower end is fixed to the piston, and a through hole for loosely inserting the connecting rod is provided. Then, the opening of the cylinder is covered with a lid formed in a concave shape that opens upward.

The elevator liquid damper according to a second aspect of the present invention is such that the lid of the first aspect of the invention is provided with a slit extending outward from the through hole.

[0010]

According to the first aspect of the invention, the piston moves up and down in the liquid in the cylinder with the loading and unloading of the load to and from the lifting body to exert a damper effect. At this time, when the cylinder and the connecting rod are laterally displaced relative to each other when the connecting rod moves in and out of the through hole, the liquid entangled and adhering to the peripheral surface of the connecting rod will be stuck to the peripheral edge of the through hole of the lid. It is scraped off, leaks to the outside of the cylinder, and stays on the top surface of the lid. However, the liquid on the top surface of the lid is prevented from flowing out by the concave lid,
It is returned from the through hole into the cylinder.

According to the second aspect of the present invention, the liquid staying in the concave lid is dropped from the slit directly into the cylinder and returned, so that the time for which the liquid stays in the lid can be shortened.

[0012]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a front view showing a mounted state of a liquid damper of an elevator according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a plan view showing details of the lid of the liquid damper device for an elevator according to the first embodiment of the present invention. FIG. 4 shows B of FIG.
It is a -B line sectional view.

It should be noted that, in the drawings, the same reference numerals and symbols as those of the conventional example indicate the same or corresponding parts as those of the conventional example, and therefore, redundant description will be omitted. In FIG. 1, 1 is a car supported by the upper beam 1a, 20
Is a liquid damper of the first embodiment interposed between the rope stopper plate 2 and the support plate 6. 2 to 4, 21 is a lid of the liquid damper 20, 22 is a substantially disc-shaped bottom wall, 23 is erected on the peripheral edge of the bottom wall 22, and the outer surface is tightly fitted to the inner surface of the upper end portion of the cylinder 11. A substantially cylindrical side wall, 24 is a concave portion that is formed by the upper surface of the bottom wall 22 and the inner surface of the side wall 23 and that opens upward, and 25 is a flange-shaped support portion that extends outward from the upper edge of the side wall 23. Numeral 26 is a substantially circular through hole into which the connecting rod 15 is loosely inserted, which is bored substantially at the center of the bottom wall 22. The lid 21 of the liquid damper 20 of the elevator of the first embodiment covers the opening at the upper end of the cylinder 11 by the bottom wall 22 and the side wall 23, and is placed and supported on the upper end of the cylinder 11 via the support portion 25. As a result, the lid 21 prevents the liquid 13 in the cylinder 11 from leaking to the outside and prevents foreign matter such as dust from entering the cylinder 11 from the outside. In addition, the connecting rod 15 has a through hole 26 in the lid 21.
And the piston 14 can move up and down in the liquid 13 of the cylinder 11.

Next, the operation of the liquid damper 20 of the elevator of the first embodiment constructed as described above will be explained. First, when the load is transferred from the car 1 to the main rope 9 via the rope holder 7 as the load 1 is loaded / unloaded on / from the car 1 and the car 1 is lifted / lowered, between the rope stop plate 2 and the support plate 6. The interposed compression coil spring 5 expands and contracts to absorb the vibration generated between the car 1 and the main rope 9. On the other hand, the liquid damper 20, which is also interposed between the rope stopper plate 2 and the support plate 6, is
The piston 14 at the lower end of the connecting rod 15 moves up and down in the liquid 13 to damp and absorb the vibration generated between the car 1 and the main rope 9. This prevents vibration from being transmitted to the car 1. At this time, when the compression coil spring 5 flexes in the lateral direction, a relative positional deviation occurs in the lateral direction between the cylinder 11 and the connecting rod 15. Then, for example, when the piston 14 descends from the position shown by the chain double-dashed line in FIG. 2 to the position shown by the solid line, if a relative positional deviation occurs laterally between the cylinder 11 and the connecting rod 15, The liquid 13 entangled and attached to the peripheral surface of the connecting rod 15 is scraped off by the peripheral edge of the through hole 26 of the lid 21 as the connecting rod 15 descends, and a small amount of the liquid 13a stays in the recess 24 of the lid 21. The liquid 13a is blocked by the side wall 23 of the recess 24 even when the cylinder 11 vibrates in the lateral direction, and the cylinder 11
It does not flow out to the outside, flows on the surface of the bottom wall 22 of the recess 24 into the through hole 26, and drops from the through hole 26 into the cylinder 11 and is returned.

As described above, in the liquid damper 20 of the elevator according to the first embodiment, the cylinder 11 having the opening at the upper end and containing the liquid 13 is mounted on the support plate 6 in parallel with the expansion / contraction direction of the compression coil spring 5. In addition to being fixed, the cylinder 11
The piston 14 is fitted into the cylinder 1, the upper end of the connecting rod 15 having a diameter smaller than that of the piston 14 is fixed to the car 1, and the lower end is fixed to the piston 14,
The lid 21 that covers the opening of the No. 1 has a substantially disc-shaped bottom wall 22.
And a substantially cylindrical side wall 23 which is provided upright on the peripheral edge of the bottom wall 22 and whose outer surface is tightly fitted to the inner surface of the upper end portion of the cylinder 11, and the side wall 2
3 is formed by a flange-shaped support portion 25 protruding outward from the upper edge of the bottom wall of the bottom wall 22 and the side wall 23.
A recess 24 that opens upward is formed by the inner surface of the bottom wall 2
2 has a substantially circular through hole 26 into which the connecting rod 15 is loosely inserted in the approximate center thereof.
Is drilled.

Therefore, in the first embodiment, the piston 14 moves up and down in the cylinder 11 as the load 1 is loaded and unloaded on the car 1 and the car 1 is moved up and down, thereby exerting a damper effect. At this time, when the cylinder 11 and the connecting rod 15 are relatively displaced laterally when the connecting rod 15 moves in and out of the through hole 26, the liquid 13 entangled and attached to the peripheral surface of the connecting rod 15 is It is scraped off around the through hole 26 of the lid 21, leaks to the outside of the cylinder 11, and stays on the surface of the bottom wall 22 of the lid 21. However, the liquid 13a is prevented from flowing out to the outside by the side wall 23 of the concave portion 24 of the lid 21, is guided to the through hole 26 along the surface of the bottom wall 22, and is returned from the through hole 26 into the cylinder 11. Be done. as a result,
The amount of the liquid 13 in the cylinder 11 does not decrease below the initial set amount, and when the piston 14 is maximally raised, there is no risk of being exposed above the liquid surface of the liquid 13 and impairing the damper effect. The amount of liquid quickly returns to the initial set amount, and a good damper effect can be exhibited.

Next, a second embodiment according to the present invention will be described below. In the second embodiment, only the differences from the first embodiment will be described, and the same components as those in the first embodiment will be designated by the same reference numerals in the drawings and the description thereof will be omitted.
FIG. 5 is a plan view showing details of a lid of a liquid damper device for an elevator according to a second embodiment of the present invention.

In the figure, reference numeral 27 denotes a plurality of slits radially formed on the bottom wall 22 with the through hole 26 of the lid 21 as the center. In the elevator liquid damper of the second embodiment, eight slits 27 are formed at substantially equal angles, and each slit 27 is formed so as to extend from the through hole 26 in the radial direction to the middle of the side wall 23 in substantially the same length. It That is, in the first embodiment described above, the liquid 13a accumulated in the recess 24 is not covered with the lid 21.
Although the liquid 13a is returned from the through hole 26 in the cylinder 11 in the second embodiment,
Is returned to the inside of the cylinder 11 via the slit 27 in addition to the through hole 26.

Therefore, in the liquid damper of the elevator of the second embodiment, the liquid 13a retained in the recess 24 of the lid 21 falls back not only through the through hole 26 but also through each slit 27 into the cylinder 11 directly. Liquid 13a
It is possible to shorten the time that the stagnation stays in the recess 24 of the lid 21. As a result, the amount of the liquid 13 in the cylinder 11 returns to the initial set amount more quickly, and a good damper effect can be exhibited. In particular, since the slit 27 extends in the radial direction of the bottom wall 22, the liquid 13 passes through the through hole 26 of the bottom wall 22.
The liquid 13 is scraped off along the peripheral edge and extends in the falling direction, so that the liquid 13 efficiently drops into the cylinder 11. By the way, the recess 24 in each of the above-described embodiments is composed of a disk-shaped bottom wall 22 and a cylindrical side wall 23, but the present invention is not limited to this and is not limited to this. Hole 2
The liquid 13 scraped from the connecting rod 15 with
Anything that functions to block the flow out of the cylinder 11 may be used. For example, forming a substantially hemispherical recess,
It is also possible to adopt another shape such as a concave portion that is inclined downward from the outer periphery toward the through hole.

The slit 27 of the second embodiment is
Although it is formed so as to extend in the radial direction with the through hole 26 as the center, it may be any one that extends outwardly from the through hole 26 in a direction other than the radial direction, and for example, may be formed so as to extend spirally. It is also possible to adopt. Also,
The slits 27 may have different lengths, or only one slit 27 may be formed. Alternatively, the liquid damper of the elevator of the present invention can be embodied as a counterweight 20 as a lifting body.

[0021]

As described above, in the liquid damper for an elevator according to the first aspect of the present invention, the cylinder having the opening at the upper end for enclosing the liquid is fixed to the support plate in parallel with the expansion and contraction direction of the compression elastic body. At the same time, insert the piston into the cylinder,
The connecting rod having a diameter smaller than that of the piston is fixed to the elevating body at the upper end, and the lower end is fixed to the piston. The connecting rod has a through hole for loose insertion, and is formed in a concave shape opening upward. The lid covers the opening of the cylinder. Therefore, the piston moves up and down in the liquid of the cylinder as the load is loaded and unloaded on the lifting body, thereby exerting a damper effect. At this time, when the cylinder and the connecting rod are laterally displaced relative to each other when the connecting rod moves in and out of the through hole, the liquid entangled and adhering to the peripheral surface of the connecting rod will be stuck to the peripheral edge of the through hole of the lid. It is scraped off, leaks to the outside of the cylinder, and stays on the top surface of the lid. However, the liquid on the upper surface of the lid is prevented from flowing out by the concave lid and is returned to the inside of the cylinder through the through hole. As a result, the amount of liquid in the cylinder does not decrease below the initial set amount, and when the piston rises to the maximum, there is no danger of being exposed above the liquid level of the liquid and impairing the damper effect. The amount can be quickly returned to the initial set amount and a good damper effect can be exhibited.

A liquid damper for an elevator according to a second aspect of the present invention is such that the lid according to the first aspect of the present invention is provided with a slit extending outward from the through hole. Therefore, the liquid staying on the concave lid is dropped back from the slit directly into the cylinder and returned, so that the time for which the liquid stays on the lid can be shortened. As a result, the amount of liquid in the cylinder can be returned to the initial set amount more quickly, and a good damper effect can be exhibited.

[Brief description of drawings]

FIG. 1 is a front view showing a mounted state of a liquid damper of an elevator according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing details of the lid of the liquid damper of the elevator according to the first embodiment of the present invention.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a plan view showing details of a lid of a liquid damper device for an elevator according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a state in which a conventional liquid damper for an elevator is attached to a rope holding device disclosed in Japanese Patent Laid-Open No. 57-44593.

[Explanation of symbols]

 1 Car (elevating body) 5 Compression coil spring (compression elastic body) 6 Support plate 7 Rope holder 9 Main rope 11 Cylinder 13 Liquid 14 Piston 15 Connecting rod 21 Lid 26 Through hole 27 Slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoo Shimoaki 1 Hishimachi, Inazawa City, Aichi Prefecture Inazawa Works, Mitsubishi Electric Corporation

Claims (2)

[Claims] 1. A main rope for suspending a lifting body that is raised and lowered in a hoistway; one end is fixed to the main rope and the other end extends vertically so as to be loosely inserted into the lifting body and projected. A rope holding device comprising a rope holder, a support plate provided at the other end of the rope holder, and a compression elastic body interposed between the support plate and the lifting body, wherein the compression elastic body is provided. A cylinder that is fixed to the support plate in parallel with the expansion and contraction direction and has an opening at the upper end to enclose liquid, a piston that is fitted into the cylinder, and an upper end that is fixed to the lifting body and a lower end that The connecting rod having a diameter smaller than the diameter of the piston fixed to the piston, and a through hole that is formed in a concave shape that opens upward and through which the connecting rod is loosely inserted, Having a lid to cover Liquid damper elevator characterized. 2. The liquid damper for an elevator according to claim 1, wherein a slit extending outward from the through hole is formed in the recess of the lid.