JPH10292848A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device having a fluctuation preventive function to prevent the fluctuation of an isolated and damping structure by the wind and the like. SOLUTION: An accepter 1 and a slider 3 moving relatively are furnished, a magnetic fluid 2 is input to the accepter 1, the slider 3 is soaked and housed to the fluid, a permanent magnet 6 is provided around the magnetic fluid 2, the slider 3 is braked normally by its magnetic force, and an electromagnet 7 which detects the amount of the vibration when a vibration is generated, and generates the line of magnetic force in the direction to deny the line of magnetic force of the permanent magnet 6 depending on the detected result, is provided, so as to compose this vibration control device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control device having a function of preventing seismic isolation and vibration of a vibration damping structure due to wind or the like.

[0002]

2. Description of the Related Art Conventionally, a structure for vibration isolation and seismic isolation supported by a combination of a bearing support mechanism and a damping device has a sufficient damping force when vibration is generated. There was a possibility that the upper structure of the bearing would move undesirably due to wind force, traffic vibration, or the like.
Therefore, it was necessary to provide a swing prevention function. On the other hand, a damper device that adjusts the damping force by utilizing the fact that the viscosity of a magnetic fluid changes by applying a magnetic field is also known (JP-A-55-112440, JP-A-1-229134). Reference). However, it must be actively operated with a constant current flow.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a device which functions as a damping device by performing an anti-oscillation function under normal conditions and automatically energizing when a certain vibration level is reached. It is assumed that.

[0004]

According to the present invention, there is provided a receiver and a slider which move relative to each other, and a fluid containing a magnetic component is contained in the receiver, and the slider is immersed in the fluid. Then, a permanent magnet is arranged around the fluid containing the magnetic substance component, the slider is always controlled by the magnetic force, the magnitude of vibration is detected when vibration occurs, and based on the detected result, And an electromagnet which generates a magnetic line of force in the direction of canceling the magnetic line of force of the permanent magnet with a magnitude corresponding to the magnitude of the vibration.

[0005] Such a device of the present invention is usually provided with a rocking prevention mechanism by connecting the receiver to the base portion side of the seismic isolation device and connecting the slider side to the structure side supported by the seismic isolation mechanism. When the vibration above the level occurs in the structure, the trigger mechanism is released to function as a damping device.

The fluid containing the magnetic substance component is, for example, a fluid in which fine powder of iron oxide is dispersed in a liquid containing a surfactant, and is a free-flowing fluid. When a magnet is brought close to such a fluid, the magnetic substance powder is attracted to the magnet and the flow of the fluid is reduced.

The present invention has the following effects by incorporating such a fluid into its structure. That is, since the slider is immersed and contained in a fluid containing a magnetic component and a permanent magnet is arranged around the fluid, the magnetic component of the fluid is always attracted by the magnetic force of the permanent magnet, and Increase the viscosity and stop the movement of the slider. When a vibration exceeding a predetermined level such as an earthquake occurs, the amount is detected and current is sent to the electromagnet surrounding the permanent magnet to generate a magnetic field line in a direction to cancel the magnetic field line of the permanent magnet.
Attraction of the magnetic component to the permanent magnet is released, and the fluid is fluidized. Then, the slider can move in the viscous fluid. Therefore, if the slider and the receiver are connected to the base portion side of the seismic isolation device and the side of the structure supported by the seismic isolation mechanism, respectively, the vibrations are attenuated. By controlling the size and location of the permanent magnet, the ability of the electromagnet, and the like, the viscosity of the fluid containing the magnetic component can be controlled, and the damping function can be adjusted.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a magnetic receiver (iron pipe or the like) in which a slider 3 is inserted so as to be able to move relative to the receiver 1. A guide rod 4 is attached to the slider 3 and protrudes out of the receiver 1. The guide rod 4 is connected to an arbitrary seismic isolation structure, for example, a structure S. The receiver 1 is connected to the base part B of the base isolation structure. The space between the inner surface of the receiver 1 and the sliding surface of the slider 3 contains a magnetic fluid 2 as a fluid containing a magnetic component. The left and right of FIG. 1 communicate with each other through the gap. An arbitrary number of permanent magnets 6, 6,... Are arranged in the slider 3, and yoke 5 is arranged on both sides thereof. Opposing poles of adjacent permanent magnets 6 are arranged to be the same. An electromagnet 7 is arranged around each permanent magnet 6. The wiring 11 is connected to the electromagnet 7 through the hollow portion of the guide rod 4. The vibration of the structural part S of the seismic isolation structure is detected by the detector M, and the electric current is supplied to the electromagnet 7 through the wiring 11. In such an arrangement, in a normal state, the lines of magnetic force (solid lines) pass from the N pole through the yoke 5, the gap, and the receiver 1 in the normal state since the permanent magnets 6 are of the same pole opposition, as shown in FIG. , Return to S pole. At this time, the viscosity of the magnetic fluid 2 in the gap is sufficiently increased by the magnetic force,
To the braking force. Therefore, the seismic isolation structure does not move due to wind or traffic vibration. When a vibration of a certain magnitude or more occurs due to an earthquake or the like, the magnitude of the vibration of the structure S is detected by the detector M, and the electromagnet 7 is energized through the wiring 11.
Since the magnetic force lines of the electromagnet 7 are set to generate the magnetic force lines in the direction of the dotted line in FIG. By doing so, the viscosity of the magnetic fluid 2 is adjusted. Therefore, in the event of an earthquake, the appropriate damping force required for the slider 3 for the seismic isolation effect can be instantaneously adjusted by energizing the electromagnet 7.

FIG. 4 shows another embodiment, in which (a) is a front view,
(B) is an AA sectional view of (A). 1 will be described with the same reference numerals. Numeral 1 denotes a receiver which contains a magnetic fluid 2 therein, in which a lower part of a slider 3 is immersed. The slider 3 is attached and suspended at the center of the inside of the gate stand 8, and wheels 9 are attached to both lower ends of the gate stand 8 so as to run on a rail 10 parallel to the receiver 1. Permanent magnet 6 between receiver 1 inside gate 8
And the electromagnet 7 are arranged, and the wiring 11 is connected to the electromagnet 7. The basic operation of the permanent magnet 6 and the electromagnet 7 is the same as in FIG.

[0011]

According to the present invention, in the normal state, the swing caused by the wind or traffic vibration is automatically prevented by the magnetic force of the permanent magnet. A device that cancels out the magnetic force of the magnet and functions as a damping device is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation of the present invention.

FIG. 3 is an explanatory diagram of an operation of the present invention during an earthquake.

FIG. 4 is an explanatory diagram of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receptor 2 Magnetic fluid 3 Slider 4 Guide rod 5 Yoke 6 Permanent magnet 7 Electromagnet 8 Gate preparation 9 Wheel 10 Rail 11 Wiring

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Minoru Okai 3-5-3 Tatsumi Koto-ku, Tokyo Mitsubishi Steel Corporation Environmental Engineering Division (72) Inventor Toshio Komi 3-5-3 Tatsumi Koto-ku, Tokyo 3 Mitsubishi Steel Corporation Environmental Engineering Division (72) Inventor Daisuke Yaguchi 3-5-3 Tatsumi Koto-ku, Tokyo Mitsubishi Steel Corporation Environmental Engineering Division (72) Inventor Takafumi Fujita 575 Nakano Hisagi, Nagareyama City, Chiba Prefecture −28

Claims (2)

[Claims] 1. It has a relatively moving receiver and a slider,
A fluid containing a magnetic component is placed in the receiver, and a slider provided with a permanent magnet and an electromagnet is immersed in the fluid, and a permanent magnet is arranged around the fluid containing the magnetic component, The slider always brakes by the magnetic force, detects the magnitude of the vibration when the vibration occurs, and, based on the detection result, changes the magnetic line of force in the direction of canceling the magnetic line of the permanent magnet to a magnitude corresponding to the magnitude of the vibration. A vibration control device comprising an electromagnet generated in the vibration control device. 2. The vibration control device according to claim 1, wherein a permanent magnet and an electromagnet are arranged on one of the receiver and the slider, and a trigger value is set in a normal state.