JP3022681B2 - Vibration isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator applied to a table or the like on which a support having a high center of gravity is installed. The present invention relates to a vibration isolation device that can reliably protect a support.

[0002]

2. Description of the Related Art Conventionally, as a so-called computer room for installing devices such as computers, a double floor structure is constructed by constructing an upper floor above a floor, and a plurality of vibration isolation mechanisms are provided on the floor. An arrangement is known in which the upper floor is arranged to support the upper floor, and the upper floor is isolated from vibrations such as earthquakes (for example, Japanese Utility Model Publication No. 57-25942).

[0003] With respect to the vertical vibration, this vibration isolator produces a long-period vibration system by providing a vertical spring, and produces a vibration-isolating effect by greatly deviating from the natural period of the building. A hydraulic damper is provided vertically to form a damping system for damping vertical vibration.

On the other hand, with regard to horizontal vibration, a horizontal spring is provided, and a base constituting a base part of a damping vibration system for vertical vibration, a sliding plate fixed to the floor surface, and a gap between the sliding plate surface are provided. The horizontal vibration is attenuated by a plate member made of a low friction material arranged at a distance from each other to achieve vibration isolation.

Further, in this vibration isolator, the load imposed on the upper floor is received by the main body cover, and the load supported by the main body cover is 90%.
% Is shared by a vertical spring and the remaining 10% is shared by a shaft disposed in the center of the inside of the main body cover via a stopper. At this time, the stopper is interposed in a state of being pulled by a tension spring. Then, when the stopper comes off due to the tensile force of the tension spring due to vertical vibration due to an earthquake or the like, the support of the main body cover is shifted to the elastic suspension by the vertical spring, and the vibration isolation effect is exhibited.

[0006]

However, in the above-described vibration isolating device, the vibration isolating effect is not exerted unless the vibration energy is large enough to operate the tension spring. There has been a demand for functioning even when the vibration energy is small, that is, even for a small earthquake or the like.

Here, regarding the damping vibration system of the vertical vibration,
By setting the vertical spring and hydraulic damper appropriately, it is possible to cope with low-energy vibration.However, the damping vibration system of horizontal vibration is not easy to set because it is a system based on sliding friction, and some measures are required. I was

Accordingly, a vibration isolator capable of exhibiting a vibration isolating effect even with a smaller vibration energy has been proposed (for example, see Japanese Patent Application Laid-Open No. 3-183864). In this vibration isolator, a supporting member provided on the lower floor supports the upper floor at a distance in a height direction to form a double floor structure, and a sliding type vibration isolating mechanism is provided between the lower floor and the supporting member. Is provided. That is, this sliding type vibration isolating mechanism is provided with a sliding plate on a lower floor for slidingly supporting a supporting member so as to be movable in a horizontal direction, and a coat layer made of a low-friction polymer material between the sliding plate and the supporting member. Is interposed. As a result, the dynamic friction coefficient μD can be reduced to about 0.06.

The vibration-absorbing performance of the low-friction type vibration-absorbing floor constructed as described above has a starting acceleration of 70 to 80 gal and a maximum response acceleration of about 100 gal, which is no problem as a vibration-isolating floor for protecting a computer. It has vibration characteristics.

However, since only the sliding type vibration isolating mechanism is used, the acceleration at which the sliding starts is at a relatively large acceleration level, and the movement at the low acceleration level lacks smoothness.

Further, when starting at a low acceleration level is required, the range of reducing the dynamic friction coefficient μD is limited in a vibration-isolated floor using only a sliding-type vibration-isolating mechanism. May not always be able to answer.

Further, when the present invention is applied to a heavy object having a center of gravity higher than the bottom area, for example, a floor for installing a lantern, a power transmission insulator or the like, a rotational component is induced during an earthquake.
Along with sufficient starting at low acceleration levels, it is desirable to also avoid the generation of rotational components.

The present invention has been made in view of such a background, and a horizontal vibration damping vibration system can exhibit a vibration isolation effect even with a small vibration energy.
In particular, it is an object of the present invention to provide a vibration isolator that can start sufficiently at a low acceleration level and can also suppress generation of a rotation component for a heavy object having a high center of gravity such as a lantern or a power transmission insulator.

[0014]

In order to achieve the above object, a vibration isolator according to the present invention comprises a double floor structure in which an upper floor is arranged on a lower floor at an interval in a height direction. a vibration isolation apparatus having a plurality of vibration-isolating mechanism for vibration noodles vertical vibration and horizontal oscillation between the lower floor and the top floor, the vibration-isolating mechanism
However, the upper floor slides on the lower floor so that it can move horizontally.
Slip-type vibration isolation mechanism to be supported and the above
Rolling type that supports the floor so that it can move horizontally.
And a parallel link mechanism interposed between the lower floor and the upper floor and restraining rotation of the upper floor is provided in parallel with the vibration isolation mechanism.

[0015]

[0016]

According to the present invention, since the rotation of the upper floor can be restrained by the parallel link mechanism, it is possible to reliably prevent the rotation component from acting on the supported member due to an earthquake or the like, and it is possible to prevent the sliding type. By using both the vibration isolating mechanism and the rolling type vibration isolating mechanism, the above-mentioned problem can be solved by utilizing the advantages of each mechanism synergistically.

Regarding the synergistic effect of the two types of vibration isolating mechanisms, it is possible to secure the damping by using the sliding bearing by the sliding type vibration isolating mechanism and to use the rolling bearing by the rolling type vibration isolating mechanism. Dynamic friction coefficient μD
Can be further reduced, and the movement of the vibration-isolated floor at a low acceleration level can be made smooth. The limit of the dynamic friction coefficient μD is about 0.06 in the sliding type vibration isolation mechanism, whereas the dynamic friction coefficient μD is limited in the rolling type vibration isolation mechanism.
Can be set to a value significantly smaller than 0.06. For example, when the same number of sliding type vibration isolating mechanisms and rolling type vibration isolating mechanisms are arranged, the overall dynamic friction coefficient μD between the upper floor and the lower floor can be set to about 0.04. There is no need for a damper.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic side configuration of the vibration isolator according to the present embodiment, FIG. 2 shows a plan configuration of the vibration isolator, and FIGS. 3 and 4 show a side configuration and a cross-sectional configuration, respectively.

Basically, the vibration isolator of the present embodiment forms a double floor structure by arranging an upper floor 2 on a lower floor 1 at an interval in a height direction, and forming a double floor structure between the lower floor 1 and the upper floor 2. A plurality of anti-vibration mechanisms for vertical and horizontal vibration isolation are provided between them. As a vibration isolation mechanism, a sliding type in which the upper floor 2 is slidably supported on the lower floor 1 so as to be movable in the horizontal direction. A vibration isolating mechanism 4 and a rolling type vibration isolating mechanism 5 that supports the upper floor 2 on the lower floor 1 so that the upper floor 2 can move in the horizontal direction, and the lower floor 1 and the upper floor 2
And a parallel link mechanism 6 for restricting the rotation of the upper floor 2 is provided between them.

In this embodiment, as shown in FIG. 1, a supported body, for example, a lantern 7, which is a heavy object having a high center of gravity relative to the bottom area, is placed and supported on the upper floor 2. The lantern 7 has a height of, for example, 5 to 6 m and a weight of about 13 tons. The sliding type anti-vibration mechanism 4 and the rolling type anti-vibration mechanism 5 that support the lantern 7 via the upper floor 2 have a total of four units of the same type and two units of the same type facing each other on a diagonal line. Have been.

The configuration of each of the anti-vibration mechanisms 4 and 5 is substantially the same except that the horizontal support type is different between the sliding type and the rolling type. Only the details will be described, and only the differences between the sliding type vibration isolating mechanism 4 will be briefly described.

The rolling type vibration isolating mechanism 5 is shown in FIGS.
As shown in the figure, the upper base 8 and the lower base 9 having, for example, a quadrangular plate-like shape are vertically arranged at intervals, and the vertical vibration isolators disposed between the corners of the upper foundation 8 and the lower foundation 9 are provided. And a support column 10 as a member. The support column 10 includes a vertical vibration-isolating rod 11, a resilient means 12 provided with a vertically extending coil spring disposed around the rod, and a cover 13 for covering the resilient means 12. Have been.

The rolling-type vibration isolating mechanism 5 has a horizontal rolling means 14 which projects from the lower surface of the lower foundation 9 and comes into contact with the upper surface of the lower floor 1. This rolling means 14
For example, it is constituted by a roller support mechanism or a free bearing, and is in rolling contact with the surface of the lower floor 1.
Is set to about 0.02.

Here, the sliding type vibration isolating mechanism 4 will be described. The upper and lower foundations, which are substantially the same as the rolling type vibration isolating mechanism 5, and a vertical vibration isolating member disposed between these corners. And sliding means for slidingly contacting the lower floor 1 in the horizontal direction. Although this sliding means is not shown, for example, a plate made of a material having low frictional resistance is slidably mounted on a stainless steel sliding plate provided on the lower floor 1. Note that a coat layer of a low-friction polymer material may be provided on the upper surface of the slide plate. Further, a low-friction lubricating film material may be interposed between the sliding plate provided with the coating layer and the plate so as to be superposed on the upper surface of the coating layer. As the coating layer, for example, a fluororesin or polyethylene is used.

A parallel link mechanism 6 for restricting the rotation of the upper floor 2 is provided in association with the vibration isolation mechanism 5 (4). The parallel link mechanism 6 includes an upper foundation 8 and a lower foundation 9.
And a horizontal link 16 whose both ends are pivotally supported between the support links 15. The horizontal link 16 is a peripheral side of the upper foundation 8 and the lower foundation 9. A total of four are installed along.

In addition to the parallel link mechanism 6, two extension coil springs 17 are provided at each corner of the lower foundation 9 along the extending direction of the horizontal link 16.
Are connected at one end. The other end of the tension coil spring 17 is connected to a bracket 18 fixed to the lower floor 1, whereby each lower foundation 9 is supported by the lower floor 1 with a constant elastic force in a tensioned state around the lower floor 1.

According to the present embodiment, the advantages of the sliding bearing and the rolling bearing and the parallel link mechanism can be used synergistically during an earthquake or the like.

That is, the use of the sliding bearings ensures the damping, the use of the rolling bearings further reduces the dynamic friction coefficient, and smoothes the movement (sliding) of the base at low acceleration levels. In addition, a vibration isolation base system that does not require a damper can be realized. As a result of the experiment, the dynamic friction coefficient as a whole was about 0.04, and it was confirmed that the starting acceleration of the vibration-isolated floor could be reduced (50 to 60 ga).
1), vibration damping effect occurs at 60 gal). In particular, the motion of the vibration-isolated floor at low acceleration levels became smooth.

Further, by using a parallel link mechanism 6 between the upper foundation 8 on which the lantern 7 is installed and the lower foundation 9 which slides in the event of an earthquake, the rotation of the upper foundation 8 is restrained, and the rotation above the lantern 7 This makes it possible to suppress the response amount due to the lantern, and it becomes suitable as a lantern vibration isolation basic system.

[0030]

As described in detail in the above embodiments, according to the present invention, the configuration having both the sliding bearing and the rolling bearing enables smooth movement at a low acceleration level, for example, low-energy horizontal vibration. In addition to the above, excellent effects are obtained, such as the generation of a rotational component by the parallel link mechanism and the prevention of tilting of a supported body having a high center of gravity with respect to the bottom area.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a vibration isolator according to the present invention.

FIG. 2 is a plan view showing the vibration isolator shown in FIG.

FIG. 3 is a side view of the same.

4 is a cross-sectional view partially cut along the line AA in FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 lower floor 2 upper floor 4 sliding type anti-vibration mechanism 5 rolling type anti-vibration mechanism 6 parallel link mechanism

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masataka Kaneko 4-640 Shimoseito, Kiyose-shi, Tokyo Inside the Obayashi Corporation Technical Research Institute (72) Inventor Joe Yasui 4-640 Shimoseito Shimoseito, Tokyo, Tokyo Inside the Technical Research Institute (72) Inventor Yukio Okuda 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Kazuhisa Kanada 2-3-3 Kandaji-cho, Chiyoda-ku Tokyo In-house (56) References JP-A-4-34188 (JP, A) JP-A-61-106864 (JP, A) JP-B-1-28256 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04H 9/02 331

Claims (1)

(57) [Claims] A plurality of upper floors are arranged on a lower floor at an interval in a height direction to form a double floor structure, and a vertical vibration and a horizontal vibration are isolated between the lower floor and the upper floor. A vibration isolation device provided with a vibration isolation mechanism of
Sliding the upper floor so that it can be moved horizontally on the floor
And the upper floor is placed horizontally on the lower floor.
Rolling-type vibration-isolation mechanism that supports rolling so that it can move in two directions
And a parallel link mechanism interposed between the lower floor and the upper floor and restraining rotation of the upper floor is provided in parallel with the vibration isolation mechanism.