JPS62278335A - Seismic isolation device - Google Patents

Abstract

PURPOSE:To obtain a high vibration proofing effect by supporting an equipment mounting frame on a support member such as a floor with a sliding means, providing a vertical vibration absorbing damper between this support member and the frame, and providing an attitude control means moved horizontally symmetrically in conjunction with the vertical vibration. CONSTITUTION:A vibration isolator is inserted between a frame 2 mounted with a protected equipment or the like and a support body such as a frame 1 vibrated by external vibration and protects the various precise protected equipment against vertical vibration such as an earthquake. In this case, a vertical sliding means constituted of a spline shaft 3 and a ball spline 4 is provided. A support means such as a coil spring 6 supporting the tare weight of an object mounted on a vertical vibration isolator and a vibration absorbing means such as a vibration absorbing damper 5 absorbing vertical vibration to an optional value are provided. Furthermore, an attitude control device 7 controlled horizontally symmetrically in conjunction with vertical vibration to keep the protected equipment horizontal is provided.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Technical Field The present invention provides a vertical vibration system that can completely protect magnetic disk drives and various other precision protected equipment from vertical vibrations caused by earthquakes, etc. It relates to a dynamic seismic isolation device, in particular, a vertical sliding means such as a ball spline, a supporting means such as a coil spring, a vibration absorbing means such as a vibration absorbing damper,
By using posture control means that is configured to operate symmetrically with respect to vertical vibrations, vertical vibrations transmitted from the building floor etc. can be damped and absorbed, thereby reducing the vulnerability to vibrations. As for protection equipment, the present invention relates to a vertical motion seismic isolation device that can completely protect its functions.

In general, so-called seismic protection devices that protect various equipment from disasters caused by vibrations such as earthquakes are broadly classified into two types.

First, development is progressing from the viewpoint of strength, which is how to make protected equipment strong.

That is, the question of what seismic intensity an earthquake protection device can withstand is always a question, and the current situation is that the effect of vibration on the function of protected equipment during an earthquake is not taken into account.

Therefore, when using this type of seismic protection device,
Even if the protected equipment does not suffer damage such as falling over due to an earthquake, there is no guarantee that the functions of the protected equipment, which is vulnerable to vibration, will be reliably protected. is left behind.

The second method focuses on protecting protected equipment that is susceptible to vibrations, and a safety device is provided at the functional center of the equipment where vibrations are averse.

In the event of a major earthquake, the system is designed to stop functioning due to vibrations greater than -.

By installing this type of safety device, it is possible to protect protected equipment that is vulnerable to vibrations. However, it does not protect the functions in the event of an earthquake.

There was an inconvenience that the function would inevitably stop.

As a way to solve these inconveniences, the inventors of the present invention first attempted to prevent the protected equipment from suffering damage such as falling over, but also to ensure that the harmful vibrations caused by earthquakes, etc. We are proposing a seismic isolation device that prevents vibrations from being transmitted and maintains its full functionality even in the case of equipment that is susceptible to vibrations. No. 60-206113).

With the previously proposed seismic isolation device, it is possible to completely protect protected equipment against vibrations in the lateral direction, that is, the horizontal direction.

The vertical motion seismic isolation device of this invention completely protects protected equipment against vibrations in the vertical direction, that is, in the vertical direction.If both are used in combination, it can also protect against vibrations in the vertical direction. It becomes possible to completely protect the protected equipment even against lateral vibrations.

First, we will provide an overview of the previously proposed seismic isolation device.

FIG. 3 is a longitudinal sectional view showing in detail the internal structure of the previously proposed seismic isolation device. In the drawing, 11 is the case body, 12 is a bottom hole, 13 is a column for mounting the frame, 14 is a hole for floor fixing, 15 is a vibration absorption board, 16 is an annular case, 17 is a fixture for the annular case 16, and 18 is a fixing device for the annular case 16. ball bearing, 19
indicates the ball bearing mounting plate.

To briefly describe the structure of the seismic isolation device proposed earlier, the case body 11 and bottom plate 12 shown in FIG.
Composed of metal, resin, etc.

The support column 13 is made of metal, resin, etc., and in the case of Fig. 3, a screw groove is provided on its outer periphery so that a support frame on which the protected equipment is placed can be easily attached. However, it is not necessarily necessary to provide a screw groove for support.

The vibration absorption plate 15, which will be explained in detail later with reference to FIG. 4, is disk-shaped and can absorb lateral vibrations.
It has a damping function and is made of a relatively soft rubber material.

The annular case 16 has a shape that surrounds the circumference of the disk-shaped vibration absorbing disk 15, and is made of metal.

This annular case 16 functions to prevent deformation of the circumference of the vibration absorbing board 15 made of a relatively soft rubber material, and is also configured to be firmly attached to the inside of the case body 11 using a fixture 17. act.

The ball bearing mounting plate 19 and a large number of ball bearings 18 arranged concentrically on the lower surface thereof are attached to the lower part of the vibration absorption board 15 and are movable in response to arbitrary vibrations in the lateral direction. It constitutes a sliding means.

By using such a lateral sliding means consisting of the ball bearing 18 and the ball bearing mounting plate 19, the friction between the ball bearing 18 and the bottom plate 12 is reduced against any vibration in the lateral direction, that is, the horizontal direction. .

Next, the operation of the previously proposed seismic isolation device when an earthquake occurs will be explained.

The ball bearing mounting plate 19 reduces the frictional resistance with the bottom plate 12 against lateral vibrations, regardless of the strength thereof, and the vibration absorption plate 15 against impulsive vibrations.
It is attenuated and absorbed by

As a result, harmful lateral shocks and vibrations are not transmitted to the protected equipment supported by this seismic isolation device.

The following Figures 4 (1) to (3) are diagrams showing the detailed structure of the vibration absorption board 15 used in the previously proposed seismic isolation device.
(1) is a top view, (2) is a side view, and (3) is an AA sectional view. Reference numerals in the drawings are the same as in FIG. 3, and 15a indicates a through hole in the support.

In the previously proposed seismic isolation device, a vibration absorption board 15 as shown in FIG. 4 has an extremely important function for the safety of protected equipment.

That is, the vibration absorbing board 15 has a disc shape made of an elastic material such as rubber, and has a plurality of circular through holes symmetrical with respect to the center through which the pillars pass and substantially concentrically arranged. ing.

In this way, by providing a plurality of circular through holes on a concentric circle, it is possible to significantly lower the natural frequency to, for example, a fraction of a hertz. Moreover, since the vibration absorbing plate 15 is made of an elastic material such as soft rubber as a spring, a response spectrum can be obtained by deforming the vibration absorbing plate 15.

Therefore, it is possible to eliminate the directionality of lateral vibrations, and it is possible to absorb vibration energy with the same performance from earthquakes from any direction.

Thus, according to the seismic isolation device proposed earlier.

Protected equipment can be completely protected against lateral vibrations.

However, the previously proposed seismic isolation devices do not take any particular measures against vertical vibration.
Therefore, the vertical motion seismic isolation device of the present invention is suitable for use in combination with conventional seismic protection devices, especially the previously proposed seismic isolation device. The purpose is to prevent harmful vibrations such as vertical vibrations caused by earthquakes from being transmitted to protected equipment, so that even if the equipment is sensitive to vibrations, its functions can be maintained completely.

For this reason, the vertical motion seismic isolation device of the present invention has a pedestal for mounting the protected equipment, etc., and a pedestal, floor surface, and other supports that vibrate due to vibrations from the outside. In a seismic isolation device installed between a member and a member, a vertical sliding means such as a ball spline that interlocks with minimal frictional resistance without causing any vertical locking, and a seismic isolation device that absorbs vertical vibration. - supporting means such as a coil spring that supports the weight of the object on the pedestal for mounting the protected equipment mounted on the device, vibration absorbing means such as a vibration damper that absorbs vertical vibration up to an arbitrary value, and Attitude control means configured to operate symmetrically with respect to vibrations is provided.

Next, an embodiment of the vertical motion seismic isolation device of the present invention will be described in detail with reference to the drawings.

Figures 1 (1) and (2) are structural diagrams showing one embodiment of the vertical motion seismic isolation device of the present invention, (1) is a side view of the main part, (2)
In drawing 0, which is a top view, 1 is a pedestal.

1a is a support member for the spline shaft 3, 2 is a stand for mounting the protected device, 3 is the spline shaft, 4 is a ball spline, 5 is a vibration absorbing damper, 6 is a coil spring, 7 is a posture control device, and 8 is a protected device. 9 indicates the horizontal seismic isolation device, and 10 indicates the floor.

As shown in FIG. 1, the vertical motion seismic isolation device of the present invention comprises a protected equipment mounting pedestal 2 on which protected equipment is placed, and a pedestal 1 and a floor that vibrate due to external vibrations. Side 1
0 In a seismic isolation device provided between the support body and other supports, firstly, there is a vertical sliding means, such as one composed of a spline shaft 3 and a ball spline 4, and secondly, a means for absorbing vertical vibrations. Also, supporting means such as a coil spring 6 that supports the weight of the object mounted on the vertical motion seismic isolation device.

Thirdly, a vibration absorbing means such as a vibration absorbing damper 5 that absorbs vibrations up to an arbitrary value with respect to vertical vibrations, and fourthly, vibration absorbing means such as a vibration absorbing damper 5 that absorbs vibrations up to an arbitrary value, and fourthly, Attitude control means, such as an attitude control device 7, for maintaining the attitude control device 8 in a horizontal state are provided.

The first means, a vertical sliding means such as a ball spline that interlocks with minimal frictional resistance without causing vertical locking, is the spline shaft of the ball spline 4 that moves the mounting frame 2 up and down. 3, it functions to perform positioning.

The supporting means such as the coil spring 6, which is the second means, functions to absorb vertical vibrations and support the weight of the mounted object.

The vibration absorbing means such as the vibration absorbing damper 5, which is the third means, absorbs and damps energy against vertical motion and supports the weight of the protected equipment 8.

The absorption damper functions to absorb and attenuate large amplitudes.

Attitude control means such as the attitude control device 7, which is the fourth means, are as follows:
It is configured to work symmetrically with respect to vertical vibration,
It functions to balance the center of gravity with respect to the tilt caused by the center of gravity of the protected device 8.

The horizontal seismic isolation device 9 is a seismic isolation device that has been proposed previously, as already explained in connection with FIGS. 3 and 4, and has a function of completely absorbing and damping lateral vibrations. do.

The following FIGS. 2(1) and 2(2) are side views of essential parts for explaining the operation of the attitude control device 17 provided in the vertical motion seismic isolation device of the present invention shown in FIG. 1. The symbols in the drawing are the same as in FIG. 1, 2a and 2a' are fixed members provided on the mounting frame 2, 7a and 7a' are fixed shafts of the attitude control device 7, 7b and 7b' are crank members, 7c is a connecting rod connecting one end of crank members 7b and 7b'; 7d and 7;
d' indicates a rod-shaped piece attached between the other end of the crank member 7b and the fixing members 2a and 2a' of the mounting frame 2, and arrows X-Z indicate the moving direction of each part of the attitude control device 7. show.

In FIG. 2(1), the mounting frame 2 is held horizontally in a normal state.

FIG. 2 (2) shows a state in which the mounting frame 2 has moved downward.

In this case, the fixing member 2a provided on the mounting frame 2
, the rod-shaped piece 7d to which one end is attached moves in the direction of arrow X.

As the rod-like piece 7d moves downward, the crank member 7b, to which one end is connected, rotates to the right as indicated by the arrow Y about the fixed shaft 7a.

Therefore, the connecting rod 7c is also moved to the right, and the crank member 7b' connected to the other end is rotated in the direction of arrow Z.

Due to the rotational movement of the crank member 7b', the rod-shaped piece 7d' attached to the other end also moves downward, and the mounting frame 2
is moved downward and becomes horizontal again.

In this way, the posture control device 7 always functions to restore the mounting pedestal 2 to the horizontal state even when the mounting pedestal 2 begins to tilt due to vibrations in the vertical direction.

Therefore, the protected device 8 placed on the mounting frame 2
is always maintained in a horizontal state against vertical vibrations.

In addition, in the above embodiment, the case where the vertical motion seismic isolation device of the present invention is installed on the pedestal 1 supported by the horizontal seismic isolation device 9 proposed previously was explained. but,
Such a horizontal seismic isolation device 9 and mount l are not necessarily necessary, and even if they are installed directly on the floor 10, etc., harmful vertical vibration components can be completely absorbed and attenuated. it is obvious.

As explained in detail above, the vertical motion seismic isolation device of the present invention has a mechanism for interlocking the device with minimal frictional resistance without causing vertical locking, etc., when the protected equipment mounting frame 2 vibrates in the vertical direction. , a vertical sliding means composed of a spline shaft 3 and a ball spline 4, a supporting means such as a coil spring 6 that absorbs vertical vibration and supports the weight of the mounted object, and vibration up to an arbitrary value with respect to vertical vibration. vibration absorbing means such as a vibration absorbing damper 5 that absorbs the vibration, and
Attitude control device 7 that is controlled to operate symmetrically with respect to vertical vibration and maintains protected equipment 58 in a horizontal state.
．． It is equipped with

Therefore, according to the vertical motion seismic isolation device of the present invention, when an earthquake or the like occurs, vertical vibration transmitted from the floor surface of a building, etc.
That is, since harmful vibration components of vertical vibration can be completely attenuated and absorbed, it is possible to completely protect the functions of protected equipment that is particularly vulnerable to vibration.

In addition, as explained in the embodiment, when used in combination with the previously proposed seismic isolation device, that is, the horizontal seismic isolation device 9, harmful vibration components can be removed even from vibrations transmitted from the lateral direction. can be completely attenuated and absorbed.

Moreover, the structure is relatively simple, it is extremely easy to relocate, and there is no need for special maintenance, so many excellent effects can be obtained, such as being advantageous in terms of cost.

[Brief explanation of the drawing]

Figures 1 (1) and (2) are structural diagrams showing one embodiment of the vertical motion seismic isolation device of the present invention, (1) is a side view of the main part, (2)
is a top view; FIGS. 2(1) and 2(2) are side views of essential parts for explaining the operation of the attitude control device 7 provided in the vertical motion seismic isolation device of the present invention shown in FIG. 1; Figure 3 is a vertical cross-sectional view showing the internal structure of the previously proposed seismic isolation device in detail, and Figures 4 (1) to (3) are vibration absorption panels used in the previously proposed seismic isolation device. This figure shows the detailed structure of (1
) is a top view, (2) is a side view, and (3) is a sectional view taken along line A-A. In the drawing, 1 is a frame, and 1a is its spline shaft 3.
2 is a support member for mounting protected equipment, 3 is a spline shaft, 4 is a ball spline, 5 is a vibration absorption damper,
6 is a coil spring, 7 is an attitude control device, 8 is a protected device,
9 is a horizontal seismic isolation device. 10 is the floor. Geo 1 i(2) 2nd figure r+A shi◆A God 4 已

Claims (1)

[Claims] A seismic isolation device installed between a pedestal for mounting protected equipment, etc., and a pedestal, floor, or other support member that vibrates due to external vibrations, is designed to prevent vertical vibrations. On the other hand, a vertical sliding means such as a ball spline that interlocks vertically with minimal frictional resistance without causing any locking, etc., and a vertical sliding means that absorbs vertical vibration and the weight of the object on the pedestal for mounting the protected equipment. A supporting means such as a coil spring that supports the vibration absorbing means such as a vibration absorbing damper that absorbs up to an arbitrary value of vibration against vertical vibration, and a posture control means configured to operate symmetrically with respect to vertical vibration. , and a vertical motion seismic isolation device.