JP2008042128A - Magnetic shielding room apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic shielding room apparatus capable of being moved to a plurality of points from place to place, and being readily used without receiving an adverse affect by an environmental magnetic field particular to a floor surface of each point. <P>SOLUTION: In a large magnetic shielding room 3 having an internal space surrounded by a high-permeability material, a plurality of members 20 for keeping an isolation distance consist of a non-magnetic material projecting a necessary length for preventing leakage magnetic field, and is provided at a plurality of downside points of a lower member 6 of the magnetic shielding room 3 with being directed to downside. A hollow tire 28 is provided at each lower part of the members 20 for keeping an isolation distance, so that rotational locomotion on a floor surface is possible, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a magnetic shield room apparatus having an entrance through which a human can enter and exit and a sufficient internal space through which a human can enter, and more specifically, the internal space in the magnetic shield room is surrounded by a high permeability material. The present invention relates to a magnetic shield room device that is shielded from an external magnetic field.

  As shown in FIG. 4, the conventional magnetic shield room 3 includes an upper member 4 (also referred to as a ceiling member) 4 and a side peripheral member (also referred to as a wall member). 5) and a lower member (also referred to as a floor member) 6 to block the internal space 10 from an external environmental magnetic field and create a low magnetic field in the internal space 10. And the equipment required for the low magnetic field of the internal space 10 is brought in, and the operation | work which measures a weak magnetic field is performed (for example, refer patent document 1).

However, when an object (for example, an arbitrary machine, a steel shelf, a cabinet, or the like) made of a magnetic material exists in the vicinity of the magnetic shield room 3, the magnetic material 33 constituting the object has a magnetic effect on the magnetic shield room 3. . That is, as is well known, a magnetic material such as iron emits or sucks magnetic lines of force, and sucks or plays magnetic lines of magnetic force such as external geomagnetism.
Therefore, when an object 33 made of a magnetic material exists in the vicinity of the magnetic shield room 3 as shown in FIG. 4, the flow of the magnetic lines 35 flowing through the high permeability material surrounding the magnetic shield room 3 is disturbed, and the room This causes the magnetic field 34 to leak.
As a countermeasure against the leakage magnetic field 34 for the room 10, a local environmental magnetic field measurement survey is performed at the design stage to avoid adverse effects in advance.
However, if a weak leakage magnetic field 34 is generated locally in the room 10 due to unexpected circumstances, avoid the location of the leakage magnetic field 34 in the room and place equipment in a place where the influence of the leakage magnetic field 34 is small. The target measurement work is being performed.

JP-A-9-289393

By the way, if you want to use one magnetic shield room 3 in multiple places, for example, in a university, and want to use the magnetic shield room 3 for your own research in multiple laboratories, One magnetic shield room 3 must be relocated to a plurality of points.
However, as a first point, the large magnetic shield room 3 that can be put into the room 10 by a person who operates the equipment and the equipment is heavy, and there is a problem in that the transportation is difficult.

Furthermore, a big problem as the second point is a problem that accompanies different environmental magnetic fields related to the installation surface at the transfer destination.
In many cases, the floors of university laboratories are usually made of reinforced concrete. Therefore, structural reinforcing bars (rebars are made of a magnetic material) are arranged vertically and horizontally at fine pitches at a depth of about 20 to 30 mm from the floor surface. These bar arrangements are embedded in the floor in a hidden state that cannot be seen from the surface.
Therefore, even if one magnetic shield room 3 is simply brought into one laboratory and installed, the magnetic shield room 3 is magnetically composed of structural reinforcing bars (magnetic material) embedded in the floor. Will be strongly affected.
The magnetic influence of the structural reinforcing bars (magnetic material) can be easily imagined from the turbulence diagram of the magnetic field 34 in FIG. 4, and the floor member 6 of the magnetic shield room 3 is embedded in the laboratory floor. Since it is close to the reinforcing steel (magnetic material), a part of the magnetic flux passing through the floor member 6 becomes a large leakage magnetic field toward the room 10.
Under such circumstances, it is necessary to investigate the location of the leakage magnetic field 34 in the room. Even if the location of the leakage magnetic field 34 is specified as a result of the investigation, if the leakage magnetic field 34 is large and spread over a wide area, it is avoided and the equipment is arranged in a place where the influence of the leakage magnetic field 34 is less affected. There arises a problem that the measurement work cannot be performed.

The purpose of this application is to respond to the request even when there is a request to use one magnetic shield room from a plurality of locations. It is an object of the present invention to provide a magnetic shield room device that can be used immediately without being adversely affected by a specific environmental magnetic field.
Another object is to provide a plurality of separation distance maintaining members made of a non-magnetic material in a state in which the lower member 6 of the magnetic shield room protrudes long downwards at a plurality of positions on the lower side of the lower member 6. Each of the separation distance maintaining members is used as a mounting portion of the hollow tire, and the magnet can be used for the convenience of moving the magnetic shield room and also for preventing the vibration of the magnetic shield room. A shield room device is to be provided.
Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.

  The magnetic shield room device according to the present invention includes an internal space surrounded by an upper member 4, a side peripheral member 5, and a lower member 6, each of which is made of a high magnetic permeability material. Magnetic shield room device configured in a large internal space 10 in which a person can enter, and the magnetic shield room device 3 includes a doorway 7 through which a human can enter and exit the internal space 10. 1, a plurality of spaces made of a non-magnetic material in a state of projecting a length necessary for preventing a leakage magnetic field toward the lower side at a plurality of positions on the lower side of the lower member 6 of the magnetic shield room 3. A distance maintaining member 20 is provided, and a hollow tire 28 is provided at a lower portion of each of the plurality of separation distance maintaining members 20 so as to be able to rotate and move on the floor surface.

As described above, the present invention is provided with a plurality of separation distance maintaining members 20 made of a non-magnetic material in a state of projecting long downwards at a plurality of positions on the lower side of the lower member 6 of the magnetic shield room 3. Because it
Even when there is a request to use one magnetic shield room 3 from multiple laboratories, in response to the request, one magnetic shield room 3 is moved to several locations, and the floor surface specific to each location is unique. There is an advantage in use that can be used immediately without being adversely affected by the environmental magnetic field.
That is, the structures of the reinforcing bars 32 embedded in the floor, such as the depth, thickness, and pitch, are different from each other at the destinations, and the environmental magnetic fields are also different from each other. However, the magnetic shield room 3 of the present invention is sufficiently downward from the lower member 6 of the magnetic shield room 3 so as not to be affected by the environmental magnetic field that is uniquely generated by the reinforcing bars 32 embedded in the floor surface. Since the separation distance maintaining member 20 that can be formed long is provided, the influence of the environmental magnetic field that the reinforcing bar 32 on the floor inherently generates regardless of the movement location of the magnetic shield room 3 is provided. There is an effect that the magnetic shield room 3 can be used immediately after moving.

Moreover, in the present invention,
Since each hollow tire 28 is provided in a state in which it can freely rotate on the floor surface in each lower part in each separation distance maintaining member 20, the appearance state in each separation distance maintaining member 20 is Even if a plurality of separation distance maintaining members 20 are long projected from the lower member 6 of the magnetic shield room 3 to the lower side, the appearance will be as if a general moving wheel is attached. There is also an effect that it is allowed to project in a long manner in appearance for each of the plurality of separation distance maintaining members 20 without being uncomfortable.

Furthermore, in the present invention,
Since a plurality of separation distance maintaining members 20 made of a nonmagnetic material projecting long downward are provided at a plurality of positions on the lower side of the lower member 6 of the magnetic shield room 3, respectively. There is an effect that the separation distance maintaining member 20 can be used as a mounting portion of the hollow tire 28.
In this way, by using the separation distance maintaining member 20 that protrudes downward from the lower member 6 of the room 3, the distance between the ground contact surface 31 of the tire 28 and the lower member 6 of the magnetic shield room 3. Can be increased.
Therefore, the presence of the hollow tire 28 makes it easy to move the heavy magnetic shield room 3 to the destination one after another, and there is a large convex obstacle in the passage during the movement. However, there is also an effect that the magnetic shield room 3 can be easily moved over it.

Furthermore, in the present invention, when used at the destination, there is an effect that it is possible to prevent the magnetic shield room 3 from vibrating and contribute to the measurement of a weak environmental magnetic field.
Normally, very weak vibrations caused by the passage of trains and cars are repeatedly transmitted to buildings, and weak vibrations are repeatedly transmitted to the magnetic shield room 3 installed in the buildings.
However, in the present invention, as described above, the hollow tires 28 are provided at the lower portions of the plurality of separation distance maintaining members 20, respectively. Absorbing the “vibration” to weaken the transmission, preventing the magnetic shield room 3 from vibrating and preventing the disturbance of the magnetic field in the room in advance.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view of the magnetic shield room apparatus 1 as seen from an obliquely upward direction so that the front, side, and plane with the entrance 7 can be seen. 2 and 3 are partially broken enlarged views for explaining the configuration relating to the separation distance maintaining member 20 appearing in the lower part of the magnetic shield room 3 of FIG. 1 and the tire attached thereto. FIG. 2 shows a state in which the reinforcing bar 32 is placed on a concrete floor 31 where the reinforcing bars 32 are arranged. FIG. 4 is a diagram for explaining the relationship between the magnetic shield room 3, an arbitrary structure 33 made of a magnetic material, and the magnetic field 34.

As is generally known, the magnetic shield room 3 in the magnetic shield room apparatus 1 constitutes a low magnetic field in the internal space 10 and is used for the work of bringing in necessary equipment indoors and measuring a weak magnetic field. Yes.
As is well known, the internal space 10 surrounded by the upper member 4, the side peripheral member 5, and the lower member 6 each formed of a high magnetic permeability material is formed. There are various sizes of the space 10, for example, height: 1000-2400 mm × depth: 1500-2500 mm × width: 600-1500 mm. In addition, the weight ranges from 200 kg to 800 kg. In the present case, the magnetic shield room 3 having a large and heavy structure with a large internal space 10 that can be entered by a human being is intended. The illustrated magnetic shield room 3 includes an entrance 7 through which a human can enter and exit the internal space 10, and an opening / closing door 8 for closing the entrance 7. 8a indicates a hinge for an open / close door, 9 indicates a door handle, and 15 indicates a signal line through hole. Of course, the members indicated by reference numerals 8a, 9, and 15 are made of a known non-magnetic hard material. In this case, permalloy (JIS C 2531 PC) is used as a high permeability material.

The plurality of lower portions of the floor material 6 exemplified as the lower member 6 of the magnetic shield room 3 are each made of a nonmagnetic material in a state of projecting to the lower side for the length necessary for preventing a leakage magnetic field. A plurality of separation distance maintaining members 20 are provided.
The plurality of locations on the lower side of the flooring 6 are, for example, three or more support points, preferably a separation distance maintaining member so that four or more stable support points can be obtained over the four corners as can be understood from the drawing. It means that 20 is arranged.
The separation distance maintaining member 20 shown in FIGS. 1, 2, and 3 is made of a nonmagnetic material (for example, any nonmagnetic hard material such as stainless steel SUS304 or aluminum).
In FIG. 2, 21a indicates a base that is in contact with the lower member 6 of the shield room 3 in a wide and stable state, and 21 indicates a contact surface on the base side. Reference numeral 22 denotes a lower portion of the separation distance maintaining member 20, and an axle 26 in the tire mechanism 25 is fixedly (or freely rotatable) attached to a shaft attachment portion 23 (for example, a shaft hole) provided here. Reference numeral 24 denotes a bolt formed of a non-magnetic material (for example, stainless steel SUS304), which is used for firmly fixing the base 21 a to the lower member 6 of the shield room 3.

In the separation distance maintaining member 20, a section indicated by reference numeral 20 a, that is, a section of a portion where the magnetic material below the contact surface 21 on the base side in FIG. 2 exists (a portion of the uppermost portion 27 a of the wheel 27), Whether the portion where the magnetic material is present (the portion of the uppermost portion 27a of the wheel 27) greatly affects the inner space 10 of the lower member 6 of the shield room 3 or does not substantially affect the effect. This is a section that greatly affects the problem. The section 20a indicates the length necessary for preventing the leakage magnetic field in the vertical direction as the separation distance maintaining member 20. The length necessary for preventing the leakage magnetic field in the vertical direction (section 20a) as the separation distance maintaining member 20 here may be 120 mm or more, preferably 150 mm or more, as is apparent from the following experimental example.
The member as the separation distance maintaining member 20 exemplifies a member from the abutting surface 21 to the lower portion 22 for providing the shaft attachment portion 23 as a structural material for supporting the tire mechanism 25. The separation distance maintaining member 20 as a non-magnetic member required for the above is not limited to the entire region, but may be in the range of the section 20a.

Next, an actual measurement example of the leakage magnetic field will be described with reference to FIG. When an object 33 (for example, a cabinet) made of a magnetic material is in contact with the side peripheral member 5 of the shield room 3, for example, according to actual measurement values, the leaked magnetic field 34 is 100 μT, which is a very large value, and the gap 36 is At about 25 mm, the leaked magnetic field 34 is still 10 μT, which is still in a state of having a great adverse effect.
As the gap 36 is increased to 50 mm and 100 mm, the leaked magnetic field 34 becomes extremely small, 1 μT and 0.07 μT, and the adverse effect on the internal space 10 of the magnetic shield room 3 is extremely reduced.
Further, as the gap 36 becomes wider as 120 mm, the leaked magnetic field 34 becomes extremely small, and the adverse effect on the internal space 10 is substantially eliminated, 0.02 μT. Further, as the gap 36 becomes wider to 150 mm, the leaked magnetic field 34 is 0.008 μT, and the adverse effect on the internal space 10 is eliminated.
For this reason, the length necessary for preventing the leakage magnetic field in the vertical direction as the separation distance maintaining member 20 is 120 mm or more, preferably 150 mm or more in the section 20a in FIGS.

Next, tire mechanisms 25 are attached to the lower portions of the plurality of separation distance maintaining members 20, 20,.
The tire mechanism 25 may have any known configuration as long as the hollow tire 28 having elasticity as shown in FIGS. 2 and 3 is provided in a state that allows rotation and movement on the floor 31. Good. Reference numeral 26 denotes an axle, 27 denotes a wheel rotatably supported by the axle 26, and 28 denotes a hollow pneumatic rubber tire mounted around the wheel 27. As the hollow rubber tire 28, a plurality of heavy magnetic shield rooms 3 are supported, and are used when the magnetic shield room 3 is moved. What is necessary is just to use the structure which can endure the impact at the time of movement. As the size of the hollow rubber tire 28, a hollow rubber tire having a diameter of about 250 mm is used in this embodiment.

  Furthermore, as described above, weak vibrations generated by passage of trains and automobiles are repeatedly transmitted to the building, and weak vibrations are repeatedly transmitted to the magnetic shield room 3 installed in the building. Vibration is transmitted to the magnetic shield room 3, and the magnetic shield room 3 vibrates as is well known, thereby disturbing the magnetic field in the internal space 10 and adversely affecting weak measurement. However, if each of the plurality of separation distance maintaining members 20, 20,... 20 is elastically supported by the hollow pneumatic rubber tire 28 as described above, the pneumatic rubber tire absorbs vibration and the magnetic shield room 3 is absorbed. Is effective in blocking the transmission of vibration to the magnetic shield room 3, preventing the magnetic shield room 3 from vibrating, and preventing the disturbance of the magnetic field in the internal space 10 thereof.

The magnetic shield room apparatus 1 having the above-described configuration used at a specific place is moved to various places, and the use in a specific environmental magnetic field at each place will be described. At the time of movement, as shown in FIG. 1, the heavy magnetic shield room 3 is lightly moved toward the destination by utilizing the presence of a plurality of hollow tires 28 existing below the magnetic shield room 3. . In this case, the vehicle height becomes sufficiently large because the vehicle height becomes the dimension obtained by adding the dimension 20b (about 300 mm in this embodiment) to the dimension 20a described above.
In many cases, the installation location is determined on the concrete floor 31. In many cases, reinforcing bars 32 are arranged below the concrete floor 31.
However, in the magnetic shield room device 1 configured as described above, as shown in FIGS. 2 and 3, the length necessary to prevent the leakage magnetic field from the lower side of the lower member 6 toward the lower side. Since a plurality of separation distance maintaining members 20 made of a nonmagnetic material in a protruding state are provided, the magnetic shield room can be provided even if there is a magnetic field disturbance due to the presence of the rebar 32. 3 is not affected, and can be immediately used for research while the magnetic shield room 3 is carried.
In addition, even when a small vibration occurs on the floor 31 during the use for research, the tire 28 absorbs the vibration, so that no adverse effect due to the vibration is felt.
After the magnetic shield room 3 is installed, tire stopping means or braking means may be applied as usual to prevent the tire 28 from rotating.

Next, FIG. 3 showing an example different from the tire mechanism 25 of FIG. 2 in the configuration related to the separation distance maintaining member 20 will be described.
The structure shown in FIG. 3 makes the shape of the horizontal plane of the separation distance maintaining member 20 bulky and strong enough to withstand high strength, and the orientation of the pneumatic rubber tire 28 of the tire mechanism is freely oriented 360 degrees. An example configured to be converted is shown.
In FIG. 3, parts that are considered to have the same or equivalent configuration in function, property, feature, etc. as those in FIGS. .

In FIG. 3, the separation distance maintaining member 20 which is a base is made of a nonmagnetic material (for example, any nonmagnetic hard material such as stainless steel SUS304 or aluminum). The length (120 mm to 150 mm or more) necessary for preventing the magnetic field is formed to a dimension obtained between the contact surface 21 and the lower end 22.
Reference numerals 22a and 29 denote auxiliary members formed in a dish shape and a rotation frame. These are well-known configurations and may be non-magnetic materials, but in many cases, they are formed of any hard material such as steel materials related to ordinary magnetic materials. The auxiliary member 22a is firmly fixed to the base 20 with an arbitrary fixing means, for example, a bolt 24 of a nonmagnetic material (for example, stainless steel SUS304).
In the rotating frame 29, 29a indicates an upper frame, and 29b indicates a support frame extending downward from both sides of the upper frame. 29c shows the holding part of the support shaft 26 which rotatably supports the wheel 27 of the pneumatic rubber tire 28. 29e indicates a bearing interposed between the dish-shaped auxiliary member 22a and the upper frame 29a, and as is well known, the upper frame 29a is rotatable in a horizontal plane with respect to the auxiliary member 22a. is there. Thereby, the direction of the pneumatic rubber tire 28 can be rotated in any direction of 360 degrees.
The planned separation effect cannot be obtained by reducing the nature, configuration, and thickness of the non-magnetic material of the separation distance maintaining member 20, and the corresponding position of the separation distance maintaining member 20 in the room 10 is very slight. A leakage magnetic field 34 may appear. However, since this leakage magnetic field 34 is a place at the corner of the room 10, the place where it is generated is fixed, and it is extremely weak, it is practically practical if equipment for research is arranged avoiding this place. It does not have a big influence on.

The perspective view of a magnetic shield room apparatus. The partially broken enlarged view for demonstrating the structure regarding a magnetic shield room, the separation-distance maintenance member attached to the lower part, and a tire. The partially broken enlarged view for demonstrating the structure concerning a magnetic shield room, the separation distance maintenance member of the different example attached to the lower part, and a tire. The schematic diagram for demonstrating the condition of the leakage magnetic field by the positional relationship of a magnetic shielding room and the magnetic material put on the side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Magnetic shield room apparatus, 3 ... Magnetic shield room, 4 ... Upper member, 5 ... Side member, 6 ... Lower member, 7 ... Entrance / exit, 8 ... Entrance / exit Opening and closing doors, 10 ... indoor space, 20 ... separation distance maintaining member, 20a ... separation size, 21 ... contact surface, 21a ... base, 22 ... lower part, 22a ..Auxiliary member (dish-shaped), 23... Axis mounting part, 24... Bolt, 25 .. Tire mechanism, 26 .. Axle, 27. Tire, 29 ... rotating frame, 29a ... upper frame, 29b ... support frame, 29c ... bearing, 29e ... bearing, 31 ... floor surface, 32 ... structural Reinforcing bars, 33 ... an object made of a magnetic material, 34 ... a leaked magnetic field.

Claims (1)

Each has an internal space surrounded by an upper member, a side peripheral member, and a lower member each made of a high magnetic permeability material, and the size of the space is configured as a large internal space that can be entered by humans. In a magnetic shield room device, the magnetic shield room device has an entrance / exit through which a human can enter and exit the internal space.
The lower portions of the lower member of the magnetic shield room are provided with a plurality of separation distance maintaining members made of a non-magnetic material in a state protruding toward the lower side to a length necessary for preventing a leakage magnetic field. A magnetic shield room device in which a hollow tire is provided at a lower portion of each of the plurality of separation distance maintaining members so as to be capable of rotating on the floor surface.

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