JP5538577B2 - Electromagnetic force open / close type electromagnetic shield door system - Google Patents

Description

  The present invention relates to an electromagnetic shield door system using electromagnetic force for entering and exiting an electromagnetic shield room.

  The conventional electromagnetic shield door opening and closing structure in the electromagnetic shield room has a predetermined electromagnetic shielding performance by installing a conductive material on the contact surface between the door body and the door frame and bringing them into close contact with each other by a pressing mechanism. It is a configuration.

  For example, in the electromagnetic shield door seal structure according to Patent Document 1, the pressing mechanism is driven by an automatic operation using a motor or a manual operation using a handle, and the rod rod is moved from the top, bottom, left, and right of the door body toward the door frame. By protruding and rotating the conductive material eccentrically, a pressing force is generated on the principle of the lever and is brought into close contact with the door frame.

JP 11-101074 A

  Since the conventional electromagnetic shield door is configured as described above, when high electromagnetic shielding performance is required to counter electromagnetic wave eavesdropping and electromagnetic attack that has been attracting attention as a new threat in recent years, inevitably It is necessary to increase the pressing force. As a result, it is possible to ensure long-term conductivity by reducing the ease of use due to an increase in the burden of opening and closing the door, and by reducing the pressing force on the contact surface between the door body and the door frame due to accelerated wear of the parts constituting the pressing mechanism. There was a problem that it would be difficult.

  In addition, the conductive material on the contact surface between the door body and door frame attracts deposits such as iron powder and charged dust, but conventionally it is removed only during maintenance. The decrease in the thickness was also a problem that cannot be ignored from the viewpoint of ensuring conductivity.

  The present invention has been made to solve the above-described problems, and maintains an electromagnetic shield having a required shielding performance for a long period of time and a force for opening and closing the electromagnetic shield door regardless of a dynamic pressing mechanism. It is an object of the present invention to provide an electromagnetic shield door system that can open and close the electromagnetic force.

An electromagnetic force open / close type electromagnetic shield door system according to the present invention includes an electromagnet layer composed of a plurality of electromagnets installed on an inner peripheral surface of a door frame, an outer surface of the electromagnetic shield door, and a door when the opening is closed. An electromagnet layer composed of a plurality of electromagnets that abuts the electromagnet layer of the frame, a conductive material layer composed of a conductive material installed side by side on the electromagnet layer of the door frame, and an electromagnet layer of the electromagnetic shield door arranged side by side and opened. A conductive material layer made of a conductive material that abuts the conductive material layer of the door frame when the part is closed, a radio wave absorption material layer made of a radio wave absorption material installed side by side on the conductive material layer of the door frame, and an electromagnetic An electromagnetic wave absorbing material layer made of an electromagnetic wave absorbing material, an electromagnetic layer of the door frame, and an electromagnetic magnet of the electromagnetic shield door, which are installed side by side on the conductive material layer of the shield door and come into contact with the electromagnetic wave absorbing material layer of the door frame when the opening is closed. Coil excitation of layer The polarity in which a control unit that changes according to the opening and closing operation of the electromagnetic shield door.

  According to the present invention, since the polarity of coil excitation of the electromagnet layer of the door frame and the electromagnet layer of the electromagnetic shield door is changed according to the opening / closing operation of the electromagnetic shield door, the electromagnetic force of the electromagnet layer causes the electromagnetic shield door to Electromagnetic force that can hold the electromagnetic shield for a long time without reducing the pressing force due to wear because it can reduce the burden of opening and closing operation as a force to open and close, and no mechanical pressing mechanism is required An open / close electromagnetic shield door system can be provided.

It is a perspective view which shows the structure of the electromagnetic force opening / closing type electromagnetic shielding door system which concerns on Embodiment 1 of this invention. It is the perspective view which expanded the electromagnetic shielding door structure shown in FIG. It is sectional drawing which cut | disconnected the electromagnetic shield door structure of the closed state along the AA line shown in FIG. It is the figure which expanded a part of sectional drawing shown in FIG. It is a top view which shows the structure of the surface contact | abutted to the door frame of an electromagnetic shielding door. It is a figure which shows an example of the opening / closing detection structure which detects the opening / closing state of an electromagnetic shielding door. It is a flowchart which shows the operation example of the interlock control panel 6 which controls the open / close state of an electromagnetic shielding door. It is a time chart which shows operation | movement of the electromagnetic force opening / closing type electromagnetic shielding door system which concerns on Embodiment 1 of this invention. It is sectional drawing which showed the modification of the electromagnetic shielding door system which concerns on Embodiment 1, and cut | disconnected in the position corresponded to the AA line shown in FIG.

Embodiment 1 FIG.
The electromagnetic force open / close type electromagnetic shield door system shown in FIG. 1 includes an electromagnetic shield room 1 in which conductors are provided on the door, wall surface, floor surface, and ceiling surface, and doors, wall surfaces, floors provided as entrances and exits thereof. Door frame 3a electrically joined to the front chamber 2 in which a conductor is applied to the surface and the ceiling surface, the opening that communicates the electromagnetic shield room 1 and the front chamber 2, and the opening that communicates the front chamber 2 and the outside. , 3b, electromagnetic shield doors 4a and 4b for physically and electromagnetically closing and sealing each opening, and transceivers 5a-1 and 5a- used for detecting the electromagnetic shield performance of each electromagnetic shield door 4a and 4b 2, 5b-1, 5b-2, an interlock control panel 6 for controlling the opening and closing of each electromagnetic shield door 4a, 4b, and a central management terminal for controlling and monitoring the electromagnetic shielding performance of each electromagnetic shield door 4a, 4b ( Control unit) 7. Further, the interlock control panel 6 and the door frames 3a and 3b, and the interlock control panel 6 and the central management terminal 7 are connected by wire. Similarly to the normal door, door closers 8a and 8b are attached to the upper part of the suspension base of the electromagnetic shield doors 4a and 4b, and opening / closing handles 9a and 9b are attached to one side. In the illustrated example, the opening / closing handles 9a and 9b are attached to one side of each of the electromagnetic shield doors 4a and 4b.

  Since the electromagnetic shield door structure including the door frame 3a and the electromagnetic shield door 4a and the electromagnetic shield door structure including the door frame 3b and the electromagnetic shield door 4b illustrated in FIG. An electromagnetic shield door structure including the door frame 3a and the electromagnetic shield door 4a will be described as an example. FIG. 3 is a cross-sectional view taken along line AA in a state where the door frame 3a and the electromagnetic shield door 4a shown in FIG. 2 are closed, and a part thereof is enlarged and shown in FIG. FIG. 5 shows a partially enlarged plan view of the surface of the electromagnetic shield door 4a that contacts the door frame 3a.

  The electromagnet layer 10, the dust pocket layer 20, and the conductive material layer 30 are arranged in parallel at each portion where the inner periphery of the door frame 3 a and the outer periphery of the electromagnetic shield door 4 a abut. In the illustrated example, the conductive material layer 30, the dust pocket layer 20, and the electromagnet layer 10 are arranged in the arrangement order from the outer peripheral side to the inner peripheral side of the door frame 3a, but other arrangement orders may be used.

  In the electromagnetic shield door structure of the first embodiment, an electromagnet is used for the opening / closing mechanism. An electromagnet has a structure in which a coil of a predetermined number of turns is wound around a core material (for example, an iron core) of a magnetic material. By switching on / off the energization of the coil, magnetic force is generated and stopped. Can be controlled. Further, by changing the direction of coil energization, the magnetic poles of the electromagnets facing each other can be made the same or opposite. Furthermore, the force generated in the electromagnet is proportional to the number of turns of the coil and the current flowing through the coil (applied current value), and the stronger the magnetic permeability and cross-sectional area of the core material of the magnetic material, the stronger the magnetic force is generated. Can do.

  The electromagnet used in the first embodiment uses a latching (self-holding) solenoid. The general-purpose electromagnet has the above-described features, but it needs to be energized at all times. Therefore, the coil temperature easily rises and the current consumption is large. On the other hand, the latching solenoid has the same features as the general-purpose electromagnet and has a built-in permanent magnet in addition to the core around which the coil is wound. After that, there is a feature that a holding force can be obtained without energization. Therefore, compared with a general-purpose electromagnet, the temperature rise of the coil is small and current consumption can be suppressed. Further, the energization polarity differs between attraction and separation, and the core material can be separated from the permanent magnet by changing the direction of energization. Since a known latching solenoid may be used, detailed description is omitted.

The latching solenoid type electromagnets 11 are arranged facing each other on the electromagnet layer 10 of the door frame 3a and the electromagnet layer 10 of the electromagnetic shield door 4a. For example, in accordance with the opening / closing operation of the opening / closing handle 9a, the polarity of the coil excitation of the attracting surface 12 is changed by operating the direction of the passing current of the electromagnet 11 of both the door frame 3a and the electromagnetic shield door 4a, so that the electromagnet layer 10 is made uniform. The electromagnetic shield door 4a is opened and closed by the attractive force / repulsive force of the electromagnetic force of the electromagnet 11 that acts.
In addition, as for each electromagnet 11, the electromagnet 11 for normal use and the electromagnet 11 for preliminary use shall be arranged by turns. Hereinafter, the electromagnet for normal use is referred to as an electromagnet 11, and the electromagnet for preliminary use is referred to as a reserve electromagnet 11.

  Due to the airflow generated by the opening / closing operation of the electromagnetic shield door 4a or the pressure difference due to air conditioning, the surface of the conductive material layer 30 adheres to the surface of the conductive material layer 30 such as iron powder and charged dust which may impair the electromagnetic sealing performance. . Therefore, a C-shaped cross-section steel 21 is attached to each of the dust pocket layer 20 of the door frame 3a and the dust pocket layer 20 of the electromagnetic shield door 4a, and a movable lid is attached to the opening 22 to form a dust pocket. A general-purpose electromagnet (not shown) is installed inside the C-shaped cross section steel 21 to attract and remove the attracted matter attracted to the contact surfaces of the door frame 3a and the electromagnetic shield door 4a. . However, it is not always necessary to provide the dust pocket layer 20 on both the door frame 3a and the electromagnetic shield door 4a. If the dust pocket layer 20 is provided on at least one of the door frame 3a and the electromagnetic shield door 4a, the deposits can be removed. Moreover, although the dust pocket layer 20 is composed of the C-shaped cross-section steel 21, the material is not limited to steel, such as hard plastic, friction and impact by repeated opening and closing, and external impact (for example, impact of a load), etc. Any material that satisfies the strength and shape workability to such an extent that it is not easily damaged may be used.

Note that a vacuum cleaner (not shown) may be connected to the C-shaped cross-section steel 21 instead of the general-purpose electromagnet. When a general-purpose electromagnet or vacuum cleaner is used, the movable lid attached to the opening 22 is opened inward so as not to open except for the sweeping force, and is opened with the sweeping force and closed with a biasing force such as a spring after the sweep is released. Thus, the deposits attracted and removed in the opening 22 are structured not to flow backward.
Alternatively, a permanent magnet (not shown) may be installed on the C-shaped cross-section steel 21 instead of the general-purpose electromagnet. In this case, a permanent magnet having a magnetic force that does not affect the opening / closing control by the electromagnetic force of the electromagnet layer 10 is used and may be open.
Furthermore, a permanent magnet may be installed on the C-shaped cross-section steel 21 of the door frame 3a, and a general-purpose electromagnet may be installed on the C-shaped cross-section steel 21 of the electromagnetic shield door 4a. Also in this case, the deposits that hinder the conductivity of the conductive material layer 30 can be efficiently removed.

By placing conductive materials facing each other on the conductive material layer 30 of the door frame 3a and the conductive material layer 30 of the electromagnetic shield door 4a, and electrically adhering to each other by the attractive force of the electromagnet layer 10 Generate an electromagnetic shield line.
The conductive material constituting the conductive material layer 30 is coated with a non-conductive foamable core material with a conductive material, and has excellent flexibility, elasticity and resilience, and can flexibly respond to bending and compression. A shield gasket having characteristics, or a finger gasket having a characteristic excellent in spring characteristics obtained by processing a conductive material into a spring shape is used.

  The door closer 8a attached to the upper part of the suspension frame of the door frame 3a and the electromagnetic shield door 4a is hydraulic so that the opening / closing speed of the electromagnetic shield door 4a by the polarity operation of the electromagnet layer 10 is less than the opening / closing speed calculated by, for example, the Ministry of Construction notification. Control by adjustment. The opening / closing handle 9 a detects an open position or a closed position, and outputs an open position detection signal and a closed position detection signal to the interlock control panel 6.

The transceivers 5a-1 and 5a-2 are attached to the same positions on the front and back surfaces of the electromagnetic shield door 4a. For the transceivers 5a-1 and 5a-2, for example, a specific display power saving radio or the like, a compatible display radio equipment (a radio equipment with a so-called technical suitability mark) that can be operated without receiving a radio station license based on the Radio Law. Use it.
In the transceivers 5a-1 and 5a-2, a unique channel (frequency) is set for each pair so that there is no fear of interference when there are a plurality of electromagnetic shield doors 4a and 4b. When the electromagnetic shield door 4a is closed, radio waves are transmitted and received, and when the electromagnetic shield door 4a is open, transmission and reception are suspended. The frequency set in the transceivers 5a-1 and 5a-2 is determined with reference to the set frequency of the information equipment handled in the electromagnetic shield room 1.

The configuration of the electromagnetic shield door structure described above is the same as that of the electromagnetic shield door structure including the door frame 3b and the electromagnetic shield door 4b, and thus the description thereof is omitted.
The shielding performance of the electromagnetic shield doors 4a and 4b is determined by the conductive material facing each other by the attraction force of the electromagnets 11 disposed on the electromagnet layer 10 of the door frames 3a and 3b and the electromagnet layer 10 of the electromagnetic shield doors 4a and 4b. This is exhibited by an electromagnetic shield line generated by bringing the layers 30 into electrical contact with each other at a predetermined pressure. The shielding performance is adjusted by adjusting the attracting force of each electromagnet 11, and this attracting force is adjusted by adjusting the number of installed electromagnets 11, the number of operations, the number of coil turns, and the applied current value. Do. The number of installations is determined in advance when the door frames 3a and 3b and the electromagnetic shield doors 4a and 4b are installed, but the number of operations can be adjusted by returning the pre-use electromagnet 11 from the resting state, and the number of coil turns is predetermined. Adjustment is possible by providing a plurality of electrodes in the middle of the coil, selecting the position of the contact electrode, and applying a current.

  An interlock control panel 6 is installed in the front chamber 2 and controls opening and closing of the electromagnetic shield doors 4a and 4b according to a preset control program. In this example, the interlock control panel 6 outputs an operation disable signal so that when one of the electromagnetic shield doors is open, the other electromagnetic shield door is closed, whereby both electromagnetic shield doors 4a and 4b are output. The electromagnetic shield state of the electromagnetic shield room 1 is always maintained regardless of whether the electromagnetic shield doors 4a and 4b are opened or closed.

Here, the open / close detection structure of the electromagnetic shield doors 4a and 4b will be described. FIG. 6 is a view showing an example of an open / close detection structure for detecting the open / closed state of the electromagnetic shield door 4a.
The opening / closing handle 9a detects the open position or the closed position as described above, and outputs an open position detection signal and a closed position detection signal to the interlock control panel 6. Moreover, the magnet sensor 13a attached to the opposing position of the electromagnetic shield door 4a and the door frame 3a detects the position of the electromagnetic shield door 4a to confirm the open / closed state, and interlocks the open state detection signal and the closed state detection signal. Output to the control panel 6. With this magnet sensor 13a, it can be confirmed whether or not the electromagnetic shield door 4a is completely closed.

Further, the electric lock 14a locks and unlocks the electromagnetic shield door 4a by the operator's locking and unlocking operation or according to the locking instruction of the interlock control panel 6, and outputs the locking signal and unlocking signal to the interlock control panel. 6 is output. Moreover, the display board 15a is installed in the front and back both sides of the electromagnetic shielding door 4a, respectively, and the operation enabled / disabled state of the electromagnetic shielding door 4a is represented by the lighting color of the surface. In addition, a fingerprint authentication function, a non-contact card reader function and the like are added to the display panel 15a, and the display panel 15a and the central management terminal 7 cooperate to authenticate a person who can operate the electromagnetic shield door 4a. May be.
In addition, although illustration is abbreviate | omitted, the magnet sensor 13b which has the same function, the electric lock 14b, and the display board 15b shall be installed also in the electromagnetic shielding door 4b.

  FIG. 7 shows a flowchart of opening and closing control of the electromagnetic shield doors 4a and 4b by the interlock control panel 6. The interlock control panel 6 has an open / closed position detection signal output from the opening / closing handles 9a and 9b and an open / closed state detection signal output from the magnet sensors 13a and 13b for the electromagnetic shield doors 4a and 4b, respectively. Based on the unlocking / locking signal output from the electric locks 14a, 14b, the presence / absence of the opening / closing operation is confirmed (step ST1).

  The electromagnetic shield door 4a will be described as an example. The interlock control panel 6 determines that the electromagnetic shield door 4a can be operated when both the electromagnetic shield doors 4a and 4b are not opened / closed (step ST1 “operation possible”). The display board 15a is lit in green (step ST2). When the display panel 15a receives an instruction for fingerprint authentication or card authentication from the operator when the green light is on, the display panel 15a causes the central management terminal 7 to collate (step ST3). Subsequently, when the authenticated operator opens the electromagnetic shield door 4a (step ST4 “YES”), the open / close handle 9a, the magnet sensor 13a, and the electric lock 14a are opened position detection signals, opened state detection signals, and unlocked. Since the signals are output, the interlock control panel 6 receives these signals (hereinafter referred to as door operation in-progress signals), and outputs an operation impossible signal to the other electromagnetic shield door 4b (step ST5). When the electromagnetic shield door 4b receives the operation impossible signal, the electric lock 14b is locked and the display panel 15b is lit in orange (corresponding to step ST8). If there is no opening operation within a certain time after the authentication (step ST4 “NO”), the interlock control panel 6 cancels the authentication and resets the state.

  When the electromagnetic shield door 4a is closed following the opening operation ("YES" in step ST6), the opening / closing handle 9a, the magnet sensor 13a, and the electric lock 14a output a closed position detection signal, a closed state detection signal, and a locking signal. Therefore, the interlock control panel 6 receives these door operation in-progress signals, confirms that the electromagnetic shield door 4a is completely closed (step ST6 “YES”), and outputs an operation disable signal to the electromagnetic shield door 4b. Stop (step ST7). When the electromagnetic shield door 4a includes the electric lock 14a, the interlock control panel 6 outputs a signal for instructing locking to the electric lock 14a. This refers to the state where the lock is applied. When the electromagnetic shield door 4a does not include the electric lock 14a, the closing operation detection signal of the opening / closing handle 9a (or from the energization of the electromagnet layer 10 to the next energization through the non-energized state) and the magnet sensor 13a This indicates a state where the interlock control panel 6 has received both signals of the closed position detection signal.

  On the other hand, if the electromagnetic shield door 4b is being opened / closed and an operation disable signal is output, the interlock control panel 6 lights the display panel 15a in orange to inform the operator that the electromagnetic shield door 4a cannot be operated. Notification is made (step ST8). If a failure or abnormality has occurred when checking the open / close state of the electromagnetic shield door 4a, the interlock control panel 6 lights the display panel 15a in red to notify the operator of the occurrence of the failure or abnormality (step ST9). .

  The interlock control panel 6 outputs the signals output from the opening / closing handles 9a and 9b, the magnet sensors 13a and 13b, and the electric locks 14a and 14b in order to detect the opening / closing of the electromagnetic shield doors 4a and 4b (steps ST4 and ST6). Although the configuration to be used has been described as an example, the combination of signals is not limited to this. For example, the signals of the opening / closing handles 9a and 9b and the magnet sensors 13a and 13b are used, the magnet sensors 13a and 13b, and the electric lock 14a. , 14b may be used. Further, the display boards 15a and 15b may not be provided with a function of fingerprint authentication or card authentication, and may simply display a status indicating whether operation is possible.

A central management terminal 7 is installed in the electromagnetic shield room 1, and a pair of transceivers 5a-1, 5a-2 and a pair of transceivers 5b-1, 5b attached to the front and back surfaces of the electromagnetic shield doors 4a, 4b. -2 signal reception level is measured. The central management terminal 7 compares each measured signal reception level with a preset threshold value based on the measured value at the time of completion of maintenance, and the electromagnetic shields of the door frames 3a and 3b and the electromagnetic shield doors 4a and 4b. Monitor performance.
Moreover, the central management terminal 7 adjusts the applied current value to the electromagnet layer 10 on the inner periphery of the door frames 3a and 3b and the electromagnet layer 10 on the outer periphery of the electromagnetic shield doors 4a and 4b based on the monitoring result of the electromagnetic shield performance, and the preliminary use. Controls such as return of the electromagnet 11 from the rest state, display of an abnormal signal of each device, simultaneous release of electromagnetic force in an emergency, etc.

  Further, the central management terminal 7 determines whether or not a current is applied to each electromagnet layer 10 based on the door operation signal from the electromagnetic shield doors 4 a and 4 b received via the interlock control panel 6. The electromagnetic shield doors 4a and 4b are opened and closed by generating electromagnetic force by controlling. Moreover, when the dust pocket layer 20 is comprised from the general purpose electromagnet or the vacuum cleaner, the central management terminal 7 operates the dust pocket layer 20 when the electromagnetic force of each electromagnet layer 10 is cancelled | released.

  Next, the operation of the electromagnetic force open / close electromagnetic shield door system will be described with reference to the time chart shown in FIG. FIG. 8A shows an operation related to an electromagnetic shield door structure including the door frame 3a and the electromagnetic shield door 4a, and FIG. 8B illustrates an operation related to an electromagnetic shield door structure including the door frame 3b and the electromagnetic shield door 4b.

During the opening operation of the electromagnetic shield door 4a, the central management terminal 7 receives a door operation signal indicating the opening operation from the electromagnetic shield door 4a via the interlock control panel 6 (step ST11), and the door frame 3a and the electromagnetic Current applied to the coils of the electromagnet layers 10 installed on both the shield doors 4a is supplied in the same direction (step ST12). Then, the polarity of coil excitation of the electromagnet layer 10 of the door frame 3a and the electromagnet layer 10 of the electromagnetic shield door 4a becomes the same, and a repulsive force acts on the attracting surfaces 12 to open the electromagnetic shield door 4a.
Further, when the interlock control panel 6 receives a door operating signal from the electromagnetic shield door 4a (step ST11), the interlock control panel 6 outputs an operation impossible signal to the electromagnetic shield door 4b to lock the electromagnetic shield door 4b so as not to open. (Step ST13).

  The central management terminal 7 stops the current applied to the coil and releases the electromagnetic force until the next closing operation is performed after the electromagnetic shield door 4a is opened (step ST12). Further, after the electromagnetic shield door 4a is opened, the central management terminal 7 excites the electromagnetic force to the general-purpose electromagnet inside the dust pocket layer 20 or activates the vacuum cleaner connected to the inside in accordance with the release of the electromagnetic force. As a result, the attracted matter attracted to the surface of the conductive material layer 30 is attracted and removed, and the electromagnetic sealing property of the contact surface is maintained (step ST14). In addition, this process is unnecessary when a permanent magnet is installed in the dust pocket layer 20.

  On the other hand, the central management terminal 7 compares the signal reception levels of the transceivers 5b-1 and 5b-2 with the threshold values for the electromagnetic shield door 4b in the closed state that is attracted by the action of the permanent magnet built in the electromagnet 11, If the reception level is equal to or lower than the threshold value, it is determined that the electromagnetic shielding performance is normal. On the other hand, if the signal reception level exceeds the threshold value, it is determined that the electromagnetic shielding performance is degraded (step ST15). When the deterioration of the electromagnetic shielding performance is detected, the central management terminal 7 energizes the pre-used electromagnet 11 installed as the additional tightening of the electromagnetic shielding door 4b to return from the resting state, and increases the adsorption force to increase the electromagnetic force. Improve shield performance. In addition to or instead of this, the central management terminal 7 increases the number of coil turns of the electromagnet 11 and the applied current value, and increases the attractive force to improve the electromagnetic shielding performance.

  When the electromagnetic shield door 4a is closed, the central management terminal 7 receives a door operation signal indicating the closing operation from the electromagnetic shield door 4a via the interlock control panel 6, and both the door frame 3a and the electromagnetic shield door 4a. The electric current applied to the coil of each electromagnet layer 10 installed in is passed in the opposite direction (step ST16). Then, the polarities of coil excitation of the electromagnet layer 10 of the door frame 3a and the electromagnet layer 10 of the electromagnetic shield door 4a are reversed, and an attracting force acts on the attracting surfaces 12 to close the electromagnetic shield door 4a.

After the electromagnetic shield door 4a is completely closed, the central management terminal 7 stops the current applied to the coil to make it non-energized and continues the electromagnet 11 of the electromagnet layer 10 until the next opening operation is performed. By the action of the permanent magnet built into the door, the attracting state between the electromagnet layers 10 of the door frame 3a and the electromagnetic shield door 4a is maintained (step ST17).
Further, after the electromagnetic shield door 4a is completely closed, the interlock control panel 6 stops the output of the operation disable signal to the electromagnetic shield door 4b so that the electromagnetic shield door 4b can be operated.

On the other hand, when the electromagnetic shield door 4b is opened, when the electromagnetic shield door 4b is opened, the central management terminal 7 indicates that the central shield terminal 7 is opened from the electromagnetic shield door 4b as in step ST11. Is received via the interlock control panel 6 (step ST18), and the current applied to the coils of the electromagnet layers 10 installed on both the door frame 3b and the electromagnetic shield door 4b is caused to flow in the same direction (step ST19). . Then, the polarity of coil excitation of the electromagnet layer 10 of the door frame 3b and the electromagnet layer 10 of the electromagnetic shield door 4b becomes the same, and a repulsive force acts on the attracting surfaces 12 to open the electromagnetic shield door 4b.
When the interlock control panel 6 receives a door operating signal from the electromagnetic shield door 4b (step ST18), the interlock control panel 6 outputs an operation impossible signal to the electromagnetic shield door 4a to lock the electromagnetic shield door 4a so as not to open. (Step ST20).
Since the following operations are also the same as the electromagnetic shield door structure including the door frame 3a and the electromagnetic shield door 4a, the description thereof is omitted.

  As described above, according to the first embodiment, the electromagnetic shield door system is electrically joined to each opening provided to enter and exit the electromagnetic shield room 1 and the front chamber 2 surrounded by the electromagnetic shield surface. Door frames 3a and 3b, electromagnetic shield doors 4a and 4b made of a conductor to physically and electromagnetically close each opening, and a plurality of doors 3a and 3b installed on the inner peripheral surface of the door frames 3a and 3b. An electromagnet layer 10 made of a plurality of electromagnets 11 and an electromagnet layer made of a plurality of electromagnets 11 that are installed on the outer peripheral surfaces of the electromagnetic shield doors 4a and 4b and abut against the electromagnet layers 10 of the door frames 3a and 3b when the openings are closed. 10 and the conductive material layer 30 made of a conductive material arranged side by side on the electromagnet layer 10 of the door frames 3a and 3b, and arranged side by side on the electromagnet layer 10 of the electromagnetic shield doors 4a and 4b, and when each opening is closed Of door frames 3a and 3b The polarity of coil excitation of the conductive material layer 30 made of a conductive material in contact with the conductive material layer 30, the electromagnet layer 10 of the door frames 3a and 3b and the electromagnet layer 10 of the electromagnetic shield doors 4a and 4b is set to the electromagnetic shield door. The central management terminal 7 is configured to change according to the opening / closing operations 4a and 4b. For this reason, a repulsive force can be generated between the electromagnet layers 10 during the opening operation, and an attractive force can be generated during the closing operation to control the opening and closing of the electromagnetic shield doors 4a and 4b. Compared with the case of a typical pressing mechanism, the burden of opening and closing operations can be greatly reduced. Further, in the conventional mechanical pressing mechanism, the contact surface is loosened due to wear of the component parts and the shielding performance is deteriorated. However, according to the configuration of the first embodiment, the mechanical pressing mechanism is unnecessary. Therefore, it is possible to ensure conductivity over a long period of time.

  Moreover, according to Embodiment 1, the pair of transceivers 5a-1 and 5a-2 and the transceivers 5b-1 and 5b-2 installed on the front and rear surfaces of the electromagnetic shield doors 4a and 4b are provided. When the signal reception level of the pair of transceivers 5a-1, 5a-2 and the transceivers 5b-1, 5b-2 exceeds a preset threshold, the central management terminal 7 The electromagnetic shielding doors 4a and 4b are configured to increase the attractive force of the electromagnet layers 10 of the doors 4a and 4b. At this time, the central management terminal 7 changes the electromagnet layer 10 of the door frames 3a and 3b and the electromagnetic shield door 4a, by changing at least one of the number of coil turns, the applied current value, and the number of operations of the electromagnet 11. The conductive material layers 30 were brought into close contact with each other with a predetermined pressure by adjusting the attractive force between the electromagnet layers 10 of 4b. For this reason, the conductive material layer 30 can hold an electromagnetic shield line having a required shielding performance, and long-term conductivity can be ensured.

  According to the first embodiment, each electromagnet 11 of the electromagnet layer 10 uses a latching solenoid with a built-in permanent magnet, and the central management terminal 7 has an electromagnetic wave of each electromagnet layer 10 when the electromagnetic shield doors 4a and 4b are closed. Force excitation was stopped and the close contact state between the conductive material layers 30 was held by the attractive force of the permanent magnet. For this reason, the adsorbed state of the electromagnetic shield doors 4a and 4b and the door frames 3a and 3b can be held without energization. As a result, it is possible to suppress current consumption (cost) and damage due to coil temperature rise. It becomes.

In addition, according to the first embodiment, the dust pocket layer 20 that is installed side by side on the conductive material layer 30 of the door frames 3a and 3b and in which the electromagnets inside attract the deposits of the conductive material layer 30, and the electromagnetic shield It is installed side by side on the conductive material layer 30 of the doors 4a and 4b, and the electromagnets inside attract the deposits of the conductive material layer 30. When the openings are closed, they contact the dust pocket layers 20 of the door frames 3a and 3b. The central management terminal 7 stops the excitation of the electromagnetic force of each electromagnet layer 10 and excites the electromagnetic force of the electromagnet of each dust pocket layer 20 when the electromagnetic shield doors 4a and 4b are opened. Configured. For this reason, the cleaning of the contact surface, which was conventionally performed only during maintenance, is automated to attract deposits that may impair the electromagnetic seal, such as iron powder and charged dust attracted to the contact surface. And can be removed. As a result, long-term conductivity can be ensured.
Even if the electromagnet in the dust pocket layer 20 is replaced with a permanent magnet, or a vacuum cleaner is connected, the same effect can be obtained.

  In addition, in the said Embodiment 1, although demonstrated using the example which installs an electromagnetic shielding door structure in two places, it is not limited to this, The installation place may be one place or three places or more. . Even when three or more places are installed, the interlock control panel 6 always maintains the shield state of the electromagnetic shield room 1 by locking one electromagnetic shield door to the other electromagnetic shield door for opening and closing operations.

  Moreover, in the said Embodiment 1, although the central management terminal 7 which is a control part which controls the electromagnetic force excitation of door frame 3a, 3b and electromagnetic shielding door 4a, 4b was installed in the electromagnetic shielding room 1, it is limited to this. It may be installed in the front chamber 2 or outside.

  Further, although the attracting force by the built-in permanent magnet of the latching solenoid after the electromagnetic force of the electromagnet layer 10 is released is constant, the built-in permanent magnet is utilized by utilizing the high magnetic flux density generated when the electromagnet layer 10 is tightened by the preliminary use electromagnet 11. By exciting the magnet and increasing the attractive force, it is possible to achieve a tightening effect with respect to the built-in permanent magnet after the electromagnetic force is released.

  Further, this tightening is performed when the signal reception levels of the transceivers 5a-1, 5a-2, 5b-1, and 5b-2 installed in the electromagnetic shield doors 4a and 4b do not exceed the threshold value and are normal. Alternatively, it may be periodically executed by the central management terminal 7. Similarly, the central management terminal 7 periodically excites the coil of the pre-use electromagnet 11, increases the number of coil turns (position of the contact electrode), increases the applied current, and so on. The magnetic flux density may be increased. By increasing the magnetic flux density of the electromagnet layer 10 in this way, the built-in permanent magnet of the latching solenoid can be periodically excited to maintain the magnetic force of the built-in permanent magnet.

  Further, the tightening pattern or the maintenance pattern (required frequency, number of coil turns, applied current) is determined by the central management terminal 7 according to the signal reception level of the transceivers 5a-1, 5a-2, 5b-1, 5b-2. You may make it judge from learning from a monitoring result.

  In the first and second embodiments, the conductive material layer 30 is provided with one conductive material. However, the present invention is not limited to this, and in addition to the conductive material layer 30, a radio wave absorbing material is used. The electromagnetic wave absorbing material layer 40 may be added to form a composite material layer composed of the conductive material layer 30 and the electromagnetic wave absorbing material layer 40. A sectional view showing this modification is shown in FIG. By combining the conductive material layer 30 as the radio wave blocking layer with the radio wave absorption material layer 40 as the radio wave absorption layer, an electromagnetic shield line can be more reliably generated by a synergistic effect. The characteristics of the radio wave absorbing material layer 40 are set with reference to the set frequency of the information equipment installed inside the electromagnetic shield room 1.

  In the first and second embodiments, one conductive material layer 30 is provided as shown in FIG. 4, and in the modification shown in FIG. 9, one conductive material layer 30 and a radio wave absorbing material layer 40 are provided. Although one layer is provided, the present invention is not limited to this, and the conductive material layer 30 and the radio wave absorption material layer 40 may have a multilayer structure according to desired shield line performance.

  1 Electromagnetic shield room, 2 Front room, 3a, 3b Door frame, 4a, 4b Electromagnetic shield door, 5a-1, 5a-2, 5b-1, 5b-2 Transceiver, 6 Interlock control panel, 7 Central management terminal (Control part), 8a, 8b Door closer, 9a, 9b Open / close handle, 10 electromagnet layer, 11 electromagnet, 12 adsorption surface, 13a magnet sensor, 14a electric lock, 15a display panel, 20 dust pocket layer, 21 C section steel, 22 openings, 30 conductive material layers, 40 radio wave absorbing material layers.

Claims (2)

A door frame electrically connected to an opening provided to enter and exit an electromagnetic shield room surrounded by an electromagnetic shield surface, and a conductor to physically and electromagnetically close the opening. In an electromagnetic force open / close type electromagnetic shield door system comprising an electromagnetic shield door,
An electromagnet layer comprising a plurality of electromagnets installed on the inner peripheral surface of the door frame;
An electromagnet layer comprising a plurality of electromagnets, which is installed on the outer peripheral surface of the electromagnetic shield door and abuts on the electromagnet layer of the door frame when the opening is closed;
A conductive material layer made of a conductive material installed side by side on the electromagnet layer of the door frame;
A conductive material layer made of a conductive material, arranged side by side on the electromagnet layer of the electromagnetic shield door, abutting on the conductive material layer of the door frame when the opening is closed,
A radio wave absorption material layer made of radio wave absorption material installed side by side on the conductive material layer of the door frame;
A radio wave absorption material layer made of a radio wave absorption material, which is installed side by side on the conductive material layer of the electromagnetic shield door and abuts on the radio wave absorption material layer of the door frame when the opening is closed,
An electromagnetic force open / close type electromagnetic shield door, comprising: a control unit that changes the polarity of coil excitation of the electromagnet layer of the door frame and the electromagnet layer of the electromagnetic shield door according to an opening / closing operation of the electromagnetic shield door. system.   The control unit generates a repulsive force between the electromagnetic layer of the door frame and the electromagnetic layer of the electromagnetic shield door when the electromagnetic shield door is opened, and generates an attractive force when the electromagnetic shield door is closed. An electromagnetic force opening / closing electromagnetic shielding door system according to claim 1.

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