JPH0433481Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vibration isolation and seismic isolation device used for machine foundations and structure foundations such as buildings.

[Conventional technology]

As such vibration isolation and seismic isolation devices, there is an oil damper that has a damper function and is used in combination with an air spring or laminated rubber that supports an object to be vibration-isolated or seismically isolated.

This oil damper utilizes a well-known hydraulic cylinder, and its damping action is limited only to the direction in which the piston moves. Therefore, it has been impossible to deal with both horizontal vibration and vertical vibration with only one oil damper.

As a solution to these shortcomings, Jitsuganaki
A shock absorbing device such as No. 55-22133 (Japanese Utility Model Application Publication No. 56-124338) has been proposed.

This is because a magnetic liquid with a permanent magnet supported in a floating field is
It is enclosed in an airtight container and is constructed by integrally connecting a rod inserted through the airtight container to a permanent magnet. The rod is inserted.

In this way, even if an impact load is applied to the rod, the impact is alleviated by the action of the permanent magnet in the magnetic liquid, and the repulsion force is inversely proportional to the unbalanced value of the permanent magnet due to the load, even for small rods. It can provide a large buffering effect.

[The problem that the idea aims to solve]

However, this Utility Application No. 55-22133 (Utility Application No. 56-
124338), there is only one three-dimensional permanent magnet in the magnetic liquid sealed in the sealed container, and the magnetic force is limited.

In addition, since the top surface of the airtight container is a bendable surface, the magnetic liquid can move up and down relatively freely, and when subjected to vertical vibrations such as traffic vibrations or earthquakes, permanent magnets and rods are damaged along with the magnetic liquid. There is also a risk that it will sway significantly up and down.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
When combined with spring materials such as air springs and laminated rubber, it can provide effective vibration isolation not only against large horizontal displacement vibrations caused by earthquakes, but also against vertical vibrations such as traffic vibrations. The object of the present invention is to provide a vibration isolation and seismic isolation device that has a simple structure and can be manufactured at low cost.

[Means to solve the problem]

In order to achieve the above object, the present invention fills a non-magnetic box with a magnetic fluid, and in this magnetic fluid, a large number of small pieces of permanent magnetic force are arranged radially with the same poles facing each other, and the surrounding area is A magnetic braking plate covered with a synthetic resin material such as acrylic is floatingly arranged, and leg-shaped supporting members that support a table-shaped supporting member are placed around the magnetic braking plate in the circumferential direction of the magnetic braking plate as appropriate. A plurality of inner lids are provided protruding at intervals, and an inner lid is placed above the magnetic braking plate in the magnetic fluid. The main idea is that it is attached to a non-magnetic box so as not to interfere with the

[Effect]

According to the present invention, the vertical vibration of the object on the support member is transmitted to the magnetic fluid, but the strong force of the magnetic fluid in the narrow area between the magnetic damping plate and the bottom of the box body and between the magnetic damping plate and the inner lid. The viscosity acts on the magnetic brake plate,
The vertical vibration of the magnetic braking plate is damped, and the magnetic braking plate 4
Provides vibration isolation and seismic isolation for objects connected to At this time,
The inner lid is fixed to the box body by its fixing fittings, and has the role of suppressing the magnetic fluid interposed between the inner lid and the magnetic braking plate, and the magnetic fluid flows against the magnetic braking plate due to vibration. Prevents the acting viscosity from decreasing.

Furthermore, in the case of large displacement vibrations in the horizontal direction caused by earthquakes, etc., the magnetic damping plate uses a large number of small permanent magnets arranged radially with the same poles facing each other, so that the magnetic force is evenly distributed outward. , and always tries to return to the center position.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a longitudinal sectional side view showing one embodiment of the vibration isolation and seismic isolation device of the present invention. indicates a box made of a non-magnetic hard material filled with a magnetic fluid 3 to be described later.

4 in the figure is a magnetic braking plate, in which a large number of permanent magnetic pieces 6 are arranged radially with the same polarity facing each other in order to obtain a strong magnetic force, and the surrounding area is made of synthetic resin material such as acrylic. It is coated and molded into a disk.

A plurality of leg-shaped supporting members 7 are provided around the magnetic braking plate 4 at appropriate intervals in the circumferential direction of the magnetic braking plate 4 to support the supporting member 1. It is housed in the magnetic fluid 3 of the box 1 in a floating state.

Further, an inner cover 5 is provided above the magnetic braking plate 4, and this is set at a position where it is inserted into the magnetic fluid 3, and its fixing fittings 8 are attached to the support member from the inner cover 5 to the box body 2. 7 so as not to obstruct the movement of the magnetic braking plate 4.

Next, in terms of usage and operation, the vibration isolation and seismic isolation device of the present invention is used in combination with air springs, laminated rubber, etc. for machine foundations and structure foundations such as buildings. is placed horizontally, and an object for vibration isolation and seismic isolation is placed on the upper surface of the support member 1. The load of the object to be vibration-proofed and seismically isolated is mainly handled by separately provided spring materials, etc.

When the box body 2 receives vertical vibrations due to traffic vibrations or earthquakes, the vertical vibrations of the object on the support member 1 are transmitted to the magnetic fluid 3. The strong viscosity of the magnetic fluid in the narrow area between the inner lids 5 acts on the magnetic braking plate 4 to damp the vertical vibration of the magnetic braking plate 4, thereby providing vibration isolation and isolation for the object connected to the magnetic braking plate 4. Shake. At this time, the inner lid 5 is fixed to the box body 2 by its fixing fittings 8, and serves to suppress the magnetic fluid 3 interposed between the inner lid 5 and the magnetic braking plate 4, so that the magnetic fluid 3 This prevents the viscosity acting on the magnetic braking plate 4 from decreasing due to the flow caused by vibration. Furthermore, the magnetic braking plate has a large number of permanent magnet pieces arranged radially with the same poles facing each other, so that the magnetic force is evenly distributed outward and always tries to return to the center position.

In addition, since an inner cover is provided above the magnetic fluid at narrow intervals, the magnetic fluid acts as a particularly strong braking force, and also eliminates even minute vibrations in the vertical direction. It's something you can shake.

Furthermore, when the box body 2 receives large horizontal vibrations such as an earthquake, the object begins to shake horizontally, and the horizontal vibrations are transmitted to the magnetic fluid 3 via the magnetic braking plate 4, but the strong viscosity of the magnetic fluid 3 causes a magnetic force. It acts on the brake plate 4 to damp horizontal vibrations.

[Effects of the invention] As stated above, the vibration isolation and seismic isolation device of the present invention has the following effects:
Since magnetic fluid is used instead of oil in the oil damper, there are no restrictions on directionality.

In addition, it is sufficiently effective against not only horizontal vibrations but also vertical vibrations, and can cope with a variety of vibrations, from small vibrations such as traffic vibrations and small earthquakes to violent lateral vibrations such as large earthquakes.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional side view showing one embodiment of the vibration damping and seismic isolation device of the present invention, FIG. 2 is a plan view of the magnetic braking plate, and FIG. 3 is a cross-sectional plan view of the entire same. DESCRIPTION OF SYMBOLS 1...Supporting member, 2...Box, 3...Magnetic fluid, 4...Magnetic braking plate, 5...Inner lid, 6...Permanent magnet piece, 7...Supporting member, 8...Fixing metal fittings.

Claims (1)

[Scope of utility model registration request] A non-magnetic box is filled with magnetic fluid, and within this magnetic fluid, a large number of small pieces of permanent magnetic force are arranged radially with the same polarity facing each other, and the surrounding area is covered with a synthetic resin material such as acrylic. A magnetic braking plate is floatingly arranged, and a plurality of leg-shaped supporting members for supporting a table-shaped supporting member are protruded from the periphery of the magnetic braking plate at appropriate intervals in the circumferential direction of the magnetic braking plate. An inner cover is placed above the brake plate and placed in the magnetic fluid, and the inner cover is inserted into a non-magnetic box by passing between the support members using a fixing fitting so as not to obstruct the movement of the magnetic brake plate. A vibration-proof and seismic isolation device that is characterized by being installed.