JP2008232335A - Electric control device for base isolation plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a base isolation plate from moving in contact with a person in a normal state by using a lock mechanism, and to quickly release the lock mechanism in an earthquake. <P>SOLUTION: A latching solenoid with a built-in permanent magnet electrically controls the base isolation plate fixed in a normal state, and the lock mechanism to be quickly released into a base isolated condition in an earthquake. The permanent magnet built in the latching solenoid normally operates the lock mechanism even in an electric failure after the earthquake. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

    The present invention relates to a seismic isolation device that protects important items from the impact of an earthquake.

    Conventionally, a base isolation table that has a shock absorbing mechanism such as a spring force and moves on a flat surface to reduce vibration has been developed. However, a base isolation table that interlocks with electrical control and earthquake early warning has not been developed.

However, the conventional seismic isolation table has a deficiency that makes a shock-absorbing mechanism work when a person comes into contact with it at normal times, and an important article placed on the mechanism moves and becomes dangerous.

In the present invention, a movable floor of an actuator represented by a solenoid installed on a fixed base is pushed up to the movable floor to fix the movable floor to the fixed base during normal times, and the movable floor moves by human contact or the like. In the event of an earthquake, the solenoid is pulled downward by the detection signal of the seismic sensor to release the restraint relationship with the fixed base of the movable floor, and the movable floor can be moved freely under a buffer mechanism such as a spring. This provides a seismic isolation device that prevents damage to important articles installed on the movable floor at low cost.
Furthermore, the self-holding solenoid in which a permanent magnet is included in the solenoid can be used to maintain its seismic isolation state even when the power is shut off after an earthquake.

The seismic isolation table to which electric control according to the present invention is added prevents the danger of shaking just by touching people during normal times, and when an earthquake occurs, the seismic sensor switches to the seismic isolation state in a very short time, and an earthquake early warning signal is input. The seismic isolation function can be maximized because the seismic isolation can be performed before a large earthquake strikes. Furthermore, since the seismic isolation state can be maintained even during a power outage immediately after an earthquake, there is an advantage that damage to surrounding people and articles can be minimized. Also, the power supply control to the actuator is only for a very short time at the time of suction and return, and usually only the LED current indicating the operating state and the idling current of the control circuit, and the power consumption and heat generation are very small and reliable. High device can be configured.

FIG. 1 shows a basic configuration of the present invention. Reference numeral 1 denotes a movable floor which can move on a plane by disposing a ball bearing 2 at the bottom thereof. Reference numeral 3 denotes a box-shaped fixing base, in which a solenoid 4 is fixed at one or a plurality of positions, and when the movable iron core 5 of the solenoid moves up and down by energization and moves up. Functions to regulate the movement of the movable floor 1 on a plane by entering a hole 7 provided at a specific location of the movable floor 1, and the movable iron core 4 is pulled downward by energization control. In this case, the movable floor 1 is configured to be freely movable on a plane. The fixed base 3 and the movable floor 1 are coupled to each other by a plurality of springs 6 on a plane, and normally the movable floor 1 functions so as to be centered with respect to the fixed base 3 by the balance of these springs. .

Reference numeral 8 denotes a vibration detection sensor, which is fixed to a part of the fixed base 3. When vibration such as an earthquake is detected, the solenoid 4 is energized and the movable iron core 5 is sucked downward to move the movable floor 1. It is configured to be able to move on the fixed base by the ball bearing 2 while being restricted by the pulling force of the spring 6.

  FIG. 2 shows that, by detecting the vibration of the seismic sensor 8, the fixed iron core 5 of the solenoid is pulled downward and separated from the hole 7 provided in the movable floor 1, whereby the movable floor is controlled in the tensile force of the spring 6. The state of moving on the fixed base in the plane direction is shown.

  FIG. 3 shows the structure of a solenoid used in the present invention. In the conventional suction type solenoid, the movable iron core is pulled upward by the spring force when no current is supplied, and the movable iron core is drawn to a position where it is attracted to the fixed iron core only when the current is supplied. The monostable latching solenoid 4 used in the present invention shown in FIG. 3 has a permanent magnet 10 disposed therein, and has two coils, a suction coil 12 and a return coil 11.

First, in an initial state, the movable iron core 5 protrudes upward by a spring 9 attached to the movable iron core 5. When the seismic sensor 8 detects vibration, the coil 12 for suction is energized for a short time, and the movable iron core is pulled downward against the spring 9 and is closed by a permanent magnet when it is attracted to the fixed iron core 13. The movable iron core 5 maintains its position even when the current is lost due to the magnetic circuit configuration. When the return coil 11 is energized for a short time, the coil is wound in the opposite direction to the attracting coil 12, so that a force repelling the holding force of the magnetic circuit is generated, and the movable iron core 5 is instantaneously moved from the fixed iron core 13. After that, the movable iron core 5 is pulled upward by the force of the spring 9.

With this configuration, even when the movable iron core 5 is pulled out upward, it is possible to hold the position without power even at the position where the movable iron core 5 is pulled down and attracted to the fixed iron core 13, especially immediately after an earthquake. The function of the base isolation table can be demonstrated even in the event of a power failure. Moreover, even if the movable iron core 5 protrudes upward and the power is removed, the movable floor 1 does not move in the horizontal direction, so no problem occurs even during temporary transportation.
Similarly, a bistable solenoid that can incorporate a permanent magnet inside and can hold the movable iron core at both the protruding and retracting positions without power supply without an external spring can also be used in the present invention.

FIG. 4 is a block diagram of a control circuit for operating the present invention, and FIG. 5 is a timing diagram of the control circuit.
The seismic sensor 8 can use a simple detector composed of two electrodes and a metal sphere. When a metal ball rolls due to vibration such as an earthquake and the two electrodes are short-circuited, the set input terminal S bar of the flip-flop 14 becomes the ground potential (hereinafter abbreviated as L), and the output Q of the flip-flop 14 is the power supply potential. (Hereinafter abbreviated as H), and L is input to the timer IC 1 through the inverter 16.

At this time, the red light emitting diode 17 is turned on to indicate the seismic isolation state. Alternatively, a red light emitting diode 17 can be blinked by adding a simple multivibrator circuit.

When L is input to the timer IC, the output is inverted to H for a fixed time determined by an external capacitor and resistor, the transistor 1 is turned on, and the suction coil 12 is energized. This energization time depends on the characteristics of the solenoid, but it is reasonable to be between 100ms and 1000ms. With this energization, the movable iron core 5 is attracted against the force of the spring 9, and when the tip contacts the fixed iron core 13, the movable iron core 5 maintains its position by the permanent magnet 10 even when the energization is terminated. Keep equipment seismically isolated. In an earthquake, a small aftershock usually occurs after the main shock, so it is necessary for the protection of important items on the base isolation table to maintain the base isolation state. In addition, since power outages often occur after severe earthquakes, the solenoid with this configuration can maintain a seismic isolation state even when the power is shut off.

After the aftershock is over, if the reset switch 15 provided on the operation panel of the base isolation table is operated, the input R bar of the flip-flop 14 becomes L, the output Q bar is inverted, and the second timer IC 2 is externally attached. The output is inverted to H for a fixed time determined by the capacitor and the resistance, the transistor 2 is turned on, and the return coil 12 is energized. As a result, the movable iron core 5 is detached from the fixed iron core 13, and the movable iron core 5 is pulled upward together with the repulsive force of the spring 9, and the movable floor 1 returns to a state where it is restrained with respect to the fixed base 3. At this time, the green light emitting diode 18 is turned on by the Q bar output of the flip-flop 14.

In the above embodiment, the earthquake is detected by the mechanical contact by the seismic sensor, but the output of the earthquake early warning device delivered to the contractor by the Japan Meteorological Agency is also a mechanical contact method by the relay and can be similarly connected.

FIG. 5 shows the operation of the control circuit on the time axis. When the seismic vibration is detected by the seismic sensor 8, the set input terminal S bar of the flip-flop 14 becomes the ground potential, and the suction coil 12 is energized for the time set in the timer IC1. As described above, when the movable iron core 5 is attracted and comes into contact with the fixed iron core 13, the movable iron core is held while being attracted to the fixed iron core even when energization of the suction coil 12 is terminated by the permanent magnet in the solenoid. The With this structure, even if the power supply is cut off immediately after the earthquake, the base isolation table can maintain the base isolation state and can protect important items installed thereon.

After the aftershock is over, the flip-flop 14 is reversed by operating the reset switch 15 by the administrator, the return coil is energized for a certain time by the timer IC2 by the Q bar output, and the movable iron core 5 is fixed to the fixed iron core 13. When detached from the movable core 5, the movable core 5 moves upward due to the repulsive force of the spring 9 provided near the movable core 5 and enters the holding hole 7 provided in the movable floor 1. To be restrained.

  FIG. 6 shows a configuration in which a timer circuit for automatically restraining the movable floor 1 to the fixed base 3 again after vibration due to an earthquake is provided. In this circuit, three timer circuits are used in place of the flip-flop of the application example to constitute the whole. When the seismic sensor 8 detects vibration, the first timer IC1 energizes the suction coil for approximately 100ms to 1000ms determined by the external capacitor and resistance to make it seismic isolation. At the same time, the second timer IC2 is started by reversing the output of the first timer IC1, this time setting is set from several minutes to several tens of minutes, the third timer IC3 is started after this set time has elapsed, and approximately 100 ms to 1000 ms The return coil is energized for a period of time.

By using this method, it is possible to automatically return to the original seismic isolation state after the end of the earthquake confusion. Also in this case, if a strong earthquake comes again, the seismic sensor 8 can realize the seismic isolation state every time.

The seismic isolation table using the present invention is expected to cause tremendous damage due to earthquakes such as high precision measuring instruments, machine tools, computers, bio-research, medical sites, tropical fish tanks, wine storages as well as arts and crafts. Available for most fields.

It is a whole block diagram of the seismic isolation apparatus concerning this invention, and the state which the movable floor is locked. It is a whole block diagram of the seismic isolation apparatus concerning this invention, and the state which the movable floor is free. Example of solenoid incorporating a permanent magnet used in the present invention Block diagram of control circuit used in the present invention Timing chart for driving the solenoid when an earthquake is detected in the present invention Block diagram for realizing automatic return according to claim 2 of the present invention

Explanation of symbols

1. Movable floor 2. Ball bearing Fixed base 4. Solenoid 5. 5. Moving iron core of solenoid Balance spring7. 7. Holding hole provided on the movable floor 8. Seismic sensor Spring provided on solenoid 10. 10. Permanent magnet built in solenoid Return coil 12. Return coil 13. Fixed iron core 14. Flip-flop 15. Reset switch 16. Inverter 17. Red light emitting diode 18. Green light emitting diode

Claims (4)

A movable floor that can move freely on a fixed base using ball bearings and a return to the original position that returns the movable floor to the predetermined initial position by a spring or a damper cushioning mechanism. The movable floor and fixed base by moving the movable part by the electrical control and spring force to the actuator fixed at an angle etc. to the structure and the fixed base, and entering the fixed position provided at the origin position of the movable floor The movable part of the actuator is fixed on the basis of the actuator mechanism that holds the positional relationship on the plane against the external force, the output of the seismic sensor that detects the vibration applied to the entire device, or the signal of the earthquake early warning that is distributed It consists of a control circuit that releases the restraint in the plane direction of the movable floor and the fixed base, and has a permanent magnet inside the actuator And the energization MenShindai of the electric control unit which is movable in a freely plane on under the control of the movable floor cushioning mechanism even when the cut-off under the influence of such an earthquake to the control circuit. In the control circuit, the movable part of the actuator is sucked in the direction of the fixed base by the output of the seismic sensor, the restraint in the plane direction of the movable floor and the fixed base is released, and the movable part is automatically moved after a certain time. An electric control circuit for the base isolation table that raises and restrains the positional relationship between the movable floor and the fixed base on the plane. In the control circuit, the movable part of the actuator is sucked in the direction of the fixed base by the output of the seismic sensor, and after releasing the restraint in the plane direction of the movable floor and the fixed base, the warning light is turned on or blinked. The movable part is lifted by the operation of the reset button provided on the operation panel, the positional relationship on the plane of the movable floor and the fixed base is restored and held, and at the same time, the illumination for the alarm is turned off and illumination for displaying normal operation is provided. The electric control circuit of the seismic isolation base to be lit. Even when the power supply to the coil is interrupted by the control circuit, a permanent magnet that retains the position of the movable part is held inside, so that even when the power supply to the control circuit is interrupted during the suction operation, An electric control device for a seismic isolation table that uses an actuator with a built-in coil that can hold the position and individually controls the protrusion and suction of the movable iron core.