JPH09105442A - Vibration control support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively support a vibration source in a vibration control condition, such as an elevation power mechanism for an elevator. SOLUTION: An elevation power mechanism 6 for an elevator is supported in a vibration control condition on the frame body 8 of a floor 4 by a vibration insulation structure 2. The vibration control support structure 2 comprises a plate-form member 10; a first vibration control rubber unit group 12 to support the plate-form member 10; and a second vibration control rubber unit group 14 to support the elevation power mechanism 6 on the plate-form member 10. The first natural frequency of a vibration system comprising formed of the masses of the first vibration control rubber unit group 12 and the plate-form member 10 supported by the first vibration control rubber unit group 12 is set to 5-7Hz. The second vibration control rubber unit group 14 is mounted on a steel product 15 in a U-shape in cross section mounted on the plate-form member 10. The second natural frequency of a vibration system formed of the masses of the second vibration control rubber unit group 14 and an elevation power mechanism 6 supported by the second vibration control rubber unit group 14 is set to 8-10Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a vibration source such as a lifting power mechanism for an elevator in a vibration-proof manner.

[0002]

2. Description of the Related Art Conventionally, for example, when a lift power mechanism for an elevator is installed on the floor of a machine room, a so-called single vibration isolation support is provided in which a vibration damping material is installed on the floor and the lift power mechanism is installed thereon. The structure is taken. In general, in order to provide the vibration-proof support structure with a high degree of vibration insulation performance, it is desirable to use a soft vibration-proof material such as a metal spring or an air spring that can reduce the spring constant. However, if a soft anti-vibration material such as a metal spring or an air spring is used for the anti-vibration support structure of the elevator power mechanism, the following problems will occur.

[0003]

That is, when the elevator is switched on, the rotation of the lifting power mechanism changes from a stop (rotation speed 0) to a predetermined rotation speed, so that the natural vibration of the vibration system of the anti-vibration support structure. Be sure to pass through several resonance regions. And when a metal spring or an air spring is used for the anti-vibration support structure,
Since the loss of the vibration isolator itself is small, the increase in amplitude due to resonance at the natural frequency is large. Therefore, the elevator itself and the pipes connected to the lifting power mechanism are greatly shaken each time the lifting power mechanism is operated, and there is a concern about the durability of the piping and the pipe connection portion.

Further, in an elevator, a load variation of 40 to 60 kg occurs for one person due to a plurality of persons coming in and out, and it is desirable that the change in deflection of the vibration isolator at that time is small. Also,
It is desirable to quickly damp vibrations when the load changes.

For these reasons, metal springs and air springs, which are advantageous in terms of high level vibration isolation, cannot be used in the vibration isolating support structure of the elevator powering mechanism of the elevator. However, there is a limit, and it is the current situation that no living room is provided near the machine room in which the elevator power mechanism is installed. The present invention has been devised in view of the above circumstances, and an object of the present invention is to effectively support an anti-vibration source such as a lifting power mechanism of an elevator.
Another object of the present invention is to provide a vibration-proof support structure that allows a living room to be provided near a machine room in which a lifting power mechanism for an elevator is installed.

[0006]

In order to achieve the above-mentioned object, the present invention has a structure in which a vibration source, in which the frequency of the generated vibration changes from zero to a predetermined frequency, is supported on a support in a vibration-proof manner. A first protection member that is disposed between the support body and the intermediate mass body that has rigidity and has a mass larger than that of the vibration source, and that supports the intermediate mass body on the support body. A vibration damping rubber unit group; and a second vibration damping rubber unit group disposed between the intermediate mass body and the vibration source to support the vibration source on the intermediate mass body,
A first natural frequency which is a natural frequency of a vibration system formed by the first anti-vibration rubber unit group and the mass of the intermediate mass body supported by the first anti-vibration rubber unit group; 2 Set to a value different from the second natural frequency which is the natural frequency of the vibration system formed by the vibration damping rubber unit group and the mass of the vibration source supported by the second vibration damping rubber unit group It is characterized by being.

Further, the present invention is characterized in that the vibration source is an elevator lifting power mechanism. In addition, the present invention is characterized in that the support is a floor forming a part of a skeleton of a building in which an elevator is installed. Further, the present invention is characterized in that one of the first natural frequency and the second natural frequency is set to 5 to 7 Hz, and the other is set to 8 to 10 Hz. Further, the present invention is characterized in that the mass of the intermediate mass body is set to be approximately twice or more the mass of the vibration source. Further, the present invention is characterized in that the intermediate mass body is constituted by a flat plate-shaped member extending horizontally.

According to the present invention, the double vibration isolating support structure having two natural frequencies is used, so that rubber is used as the vibration isolator when the natural frequency is passed, especially in the frequency region where noise is a problem. The increase in the amplitude of can be suppressed to a small level, and a sufficient vibration damping effect (attenuation amount) can be obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view of an anti-vibration support structure according to the embodiment, FIG. 2 is a front view of the same part, FIG. 3 is a plan view of the same, FIG. 4 is a detailed view of a first anti-vibration rubber unit, and FIG. 5 is a stopper. The front view of a structure is shown. Reference numeral 2 denotes an anti-vibration support structure. The anti-vibration support structure 2 anti-vibrates and supports an elevator lifting / lowering power mechanism 6 (a hydraulic power unit in the embodiment) which is a vibration source on the floor 4. In the embodiment, as shown in FIG. 2, four steel members 802 having a U-shaped cross section are formed into a rectangular frame body 8 with its concave portion facing outward, and the frame body 8 is bolted to the floor 4. It is fixed, and the vibration-proof support structure 2 is installed on this frame 8. The anti-vibration support structure 2 includes a plate-shaped member 10 arranged between the frame 8 and the lifting power mechanism 6, and a first anti-vibration rubber unit group that supports the plate-shaped member 10 on the frame 8. 12 and a second anti-vibration rubber unit group 14 that supports the lifting power mechanism 6 on the flat plate-shaped member 10, and is a so-called double anti-vibration support structure.

As shown in FIGS. 2 and 3, the flat plate-shaped member 10 has four steel members 2002 each having a U-shaped cross section, and the recesses of the steel members 2002 facing outward are substantially the same as the outline of the frame body 8. A rectangular base frame 20 is formed, a steel plate 2004 is attached to the bottom surface of the base frame 20, and an open concave portion defined by the base frame 20 and the steel plate 2004 is filled with concrete 2006.
The plate-shaped member 10 corresponds to the intermediate mass body. The plate-shaped member 10 has sufficient rigidity so that the entire plate-shaped member 10 can vibrate integrally. The thickness of the flat member 10 is set to 100 to 200 mm or more,
In the embodiment, it is set to about 200 mm. Further, the mass of the flat plate-shaped member 10 is at least larger than the mass of the lifting power mechanism 6, and is preferably twice or more, and in this embodiment, it is set to about 2 to 3 times the mass of the lifting power mechanism 6. . It should be noted that a plurality of steel plates may be stacked on the upper surface of the flat plate-like member 10 to be attached to increase the weight.

As shown in FIG. 3, the first anti-vibration rubber unit group 12 is composed of ten first anti-vibration rubber units 12A arranged between the frame body 8 and the base frame 20. Body 8
The flat plate-shaped member 10 is supported horizontally above, that is, on the floor 4. Each first anti-vibration rubber unit 1
As shown in FIGS. 4 (A) to 4 (C), 2A is a base 1202 made of synthetic resin, four cylindrical vibration-damping rubbers 1204 placed on the base 1202, and four vibration-proofs. Rubber 120
4 and a pad 1206 that holds the No. 4 pad. First
Anti-vibration rubber unit group 12 and the first anti-vibration rubber unit group 1
The first natural frequency which is the natural frequency of the vibration system formed by the mass of the flat plate-shaped member 10 supported by 2 is 4
10 to 10 Hz, preferably 5 to 7 Hz, and set to 5 to 7 Hz in this embodiment.

In the embodiment, in order to prevent excessive horizontal displacement and vertical displacement of the flat plate-shaped member 10, the frame body 8 and the flat plate-shaped member 10 are connected by a stopper structure 22 as shown in FIG. . The stopper structure 22 is the lower piece 2 of the base frame 20.
Bolt 22 inserted from 010 into the upper piece 810 of the frame body 8
02, a nut 2204 screwed to the bolt 2202 below the upper piece 810, and four washer spring washers 22 inserted into the bolt 2202 between the lower piece 2010 and the upper piece 810.
06, two nuts 2208, rubber washers 2210,
Rubber bush 221 with washer placed on the lower piece 2010
2 and the like.

In the embodiment, the second anti-vibration rubber unit group 14 is mounted on a steel material 15 having a U-shaped cross section attached to a flat plate-shaped member 10 as shown in FIGS. ing. The steel materials 15 are arranged at positions corresponding to both sides of the bottom plate 601 of the lifting power mechanism 6, and the second anti-vibration rubber unit group 14 is provided.
Is composed of four second anti-vibration rubber units 14A respectively arranged between the corners of the bottom plate 601 and both ends of each steel material 15. As shown in FIG. 6, each second anti-vibration rubber unit 14A is composed of a single cylindrical anti-vibration rubber 1402, and the anti-vibration rubber 1402 is attached from the bottom plate 601 to the center of the anti-vibration rubber 1402. Bolt 1404
And the nut 1 screwed to the bolt 1404 on the steel material 15 side.
406. Also, the steel material 15 and the bottom plate 60
In order to prevent an excessive horizontal displacement and a vertical displacement of the lifting power mechanism 6, it is connected to 1 and 1 by a stopper structure similar to the stopper structure 22 shown in FIG. The second natural frequency, which is the natural frequency of the vibration system formed by the second anti-vibration rubber unit group 14 and the mass of the lifting power mechanism 6 supported by the first anti-vibration rubber unit group 14, is It is a value different from one natural frequency and is 4 to 20 Hz, preferably 8 to 10 Hz, and is set to 8 to 10 Hz in this embodiment.

Next, the operation will be described. In the conventional single-vibration support structure of the lifting power mechanism 6, a resonance phenomenon occurs due to the natural frequency of the system determined by the spring and the mass of the lifting power mechanism 6, but in the double anti-vibration support structure 2 as in the embodiment. A first natural frequency which is a natural frequency of a vibration system formed by the first vibration-proof rubber unit group 12 and the mass of the flat plate-shaped member 10 supported by the first vibration-proof rubber unit group 12; , Second
Anti-vibration rubber unit group 14 and the first anti-vibration rubber unit group 1
Two natural frequencies, that is, the second natural frequency, which is the natural frequency of the vibration system formed by the mass of the lifting / lowering power mechanism 6 supported by 4, and two natural frequencies of the vibration system appear. . Further, because of the double anti-vibration support structure as described above, a large amount of attenuation can be obtained in the frequency range where solid noise (sound radiated as noise from vibration) is a problem. Further, since the vibration damping rubber is used as the vibration damping material while the natural vibration frequencies of the double vibration damping support structure are made different, an increase in the amplitude at the natural vibration frequency can be suppressed to a small level. In particular, in the anti-vibration support structure 2 of the lifting power mechanism 6 of the elevator, the natural frequency of the anti-vibration support structure 2 inevitably passes while the frequency of the generated vibration increases from zero to a predetermined frequency. However, according to the configuration of the embodiment, since the amplitude at the natural frequency can be suppressed to be small, there is no fear that a large force acts on the pipes connected to the lifting power mechanism 6 to shorten the life.

FIG. 7 is a diagram showing the vibration-proof performance characteristics of the vibration-proof support structure described above. In FIG. 7, the horizontal axis represents frequency and the vertical axis represents vibration transmission attenuation amount. The curve (b) in the figure is supported by the first anti-vibration rubber unit group 12 and the first anti-vibration rubber unit group 12. Shows the vibration damping performance characteristics of the vibration system composed of the mass of the flat plate-shaped member 10 and the curve (C) is supported by the second vibration damping rubber unit group 14 and the second vibration damping rubber unit group 14. The vibration isolation performance characteristics of the vibration system including the mass of the lifting power mechanism 6 are shown. Therefore, the peak of the curve (b) is the above-mentioned first natural frequency (for example, 7 Hz), and the peak of the curve (c) is the above-mentioned second frequency.
It is a natural frequency (for example, 9 Hz). The characteristic of the anti-vibration support structure of the preferred embodiment of the present invention is shown by a curve (a) which is a combination of the curves (b) and (c), and as shown in the figure, two natural frequencies around 6 Hz and around 10 Hz. Have. FIG.
Therefore, the peak amplitude at any natural frequency is small, and the area where the vibration isolation effect can be obtained (2 ^{1/2 of} the second natural frequency)
It can be seen that a sufficient vibration damping effect (attenuation amount) can be obtained at (more than twice). Therefore, the solid sound radiated as noise from the vibration can be reduced.

FIGS. 8 and 9 show the results of comparison of the sound pressure level between the conventional single vibration isolation support structure and the double vibration isolation support structure 2 according to the embodiment. 9 shows a case where the elevator is descending. 8 and 9
In the figure, the horizontal axis represents the center frequency and the vertical axis represents the sound pressure level. In the figure, NC-20 to NC-70 each represent an NC curve, and the dotted line (D) indicates the conventional single-vibration support structure. The test result is shown, and the solid line (e) shows the test result of the double anti-vibration support structure according to the example. As is clear from FIGS. 8 and 9, the conventional single-vibration support structure does not have complete insulation of vibration, and has a solid sound and is close to NC-30 at 250 Hz. In Structure 2, it was reduced by 8 dB and became NC-20 or less.

Therefore, according to this embodiment, the vibration damping support structure 2 having a large vibration damping effect can be obtained, and since the rubber is used as the vibration damping material, the increase in the amplitude at resonance at the natural frequency is small. The effect of vibrations on the lifting power mechanism 6 and peripheral devices can be reduced, which is advantageous for the safety of the elevator. Further, it is possible to provide a living room near the machine room where the lifting power mechanism of the elevator is installed. It is most suitable as a vibration isolation support structure for the lifting power mechanism. Further, since the constituent members of the vibration isolation support structure 2 according to the embodiment, that is, the first and second vibration isolation rubber unit groups 12 and 14 and the flat plate-shaped member 10 have a simple structure, the vibration isolation support structure 2 will be described. It can be manufactured at low cost.

[0018]

As is clear from the above description, the present invention
The frequency of the vibration to be generated is a structure for supporting a vibration source that changes between zero and a predetermined frequency on a support, and an intermediate mass body having rigidity and having a mass larger than that of the vibration source, A first anti-vibration rubber unit group, which is disposed between the support and the intermediate mass and supports the intermediate mass on the support, and an arrangement between the intermediate mass and the vibration source. A second anti-vibration rubber unit group that is provided to support the vibration source on the intermediate mass body;
A first natural frequency, which is a natural frequency of a vibration system formed by the vibration damping rubber unit group and the mass of the intermediate mass body supported by the first vibration damping rubber unit group, and the second vibration isolation. It is set to a value different from the second natural frequency which is the natural frequency of the vibration system formed by the rubber unit group and the mass of the vibration source supported by the second anti-vibration rubber unit group. . Therefore, in the present invention, by adopting the double anti-vibration support structure using the anti-vibration rubber having two different natural frequencies, the peak amplitude at any natural frequency can be suppressed to a small level and a sufficient anti-vibration effect (damping) can be obtained. It is also possible to provide a living room in the vicinity of the machine room where the elevator lifting mechanism is installed, and it is possible to manufacture at low cost. In particular, in the anti-vibration support structure of the elevator powering mechanism, the natural frequency of the anti-vibration support structure inevitably passes while the frequency of the generated vibration increases from zero to a predetermined frequency. However, according to the present invention, since the amplitude at the natural frequency can be suppressed to be small, a large force does not act on the pipes connected to the lifting power mechanism, which is optimal for the vibration isolation support structure of the lifting power mechanism of the elevator. is there.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an anti-vibration support structure.

FIG. 2 is a front view of a main part of a vibration-proof support structure.

FIG. 3 is a plan view of an anti-vibration support structure.

4A, 4B, and 4C are a plan view, a front view, and a side view of a first anti-vibration rubber unit.

FIG. 5 is a front view of a stopper structure.

FIG. 6 is an enlarged front view of a second anti-vibration rubber unit portion.

FIG. 7 is a diagram showing vibration damping performance characteristics of a double vibration damping support structure according to an example.

FIG. 8 is a diagram showing a comparison result of sound pressure levels of the conventional single vibration isolation support structure and the double vibration isolation support structure according to the example when the elevator is elevated.

FIG. 9 is a diagram showing a comparison result of sound pressure levels of the conventional single vibration isolation support structure and the double vibration isolation support structure according to the example when the elevator is descending.

[Explanation of symbols]

 2 Anti-vibration support structure 4 Floor 6 Lifting power mechanism 8 Frame 10 Flat member 12 First anti-vibration rubber unit group 12A First anti-vibration rubber unit 14 Second anti-vibration rubber unit group 14A Second anti-vibration rubber unit 15 Steel 22 Stopper structure

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Sugimoto 2-6-2 Otemachi, Chiyoda-ku, Tokyo Sanryo Electric Building Techno Service Co., Ltd.

Claims (6)

[Claims] 1. A structure in which a vibration source in which a frequency of generated vibration changes from zero to a predetermined frequency is vibration-isolated and supported on a support, and the structure has rigidity and has a larger mass than the vibration source. An intermediate mass body, a first anti-vibration rubber unit group arranged between the support body and the intermediate mass body to support the intermediate mass body on the support body, the intermediate mass body and the vibration source A second anti-vibration rubber unit group that is disposed between the first anti-vibration rubber unit group and the first anti-vibration rubber unit group and that supports the vibration source on the intermediate mass body. The first natural frequency, which is the natural frequency of the vibration system formed by the mass of the intermediate mass body, and the second vibration-proof rubber unit group and the second vibration-proof rubber unit group are supported. And the mass of the vibration source Vibration isolating support structure is set to a value different from the second natural frequency is a frequency, that said. 2. The anti-vibration support structure according to claim 1, wherein the vibration source is an elevator power mechanism. 3. The anti-vibration support structure according to claim 2, wherein the support body is a floor forming a part of a skeleton of a building in which an elevator is installed. 4. One of the first natural frequency and the second natural frequency is set to 5 to 7 Hz, and the other is 8 to 10 Hz.
The anti-vibration support structure according to claim 2 or 3, wherein 5. The antivibration support structure according to claim 1, wherein the mass of the intermediate mass body is set to be at least twice the mass of the vibration source. 6. The antivibration support structure according to claim 1, wherein the intermediate mass body is composed of a horizontally extending flat plate member.