Electromagnetic pulse shielding door

Abstract

The invention discloses an electromagnetic pulse shielding door, which relates to the shielding door technology and comprises a shielding door body with an observation window opening. A glass end positioning module is fixed to the side wall of the observation window opening and comprises a glass end abutting frame fixedly connected with the inner side wall of the observation window opening, and a glass limiting side plate extending in the center direction of the observation window opening is fixedly arranged on one side of the glass end abutting frame. The glass is installed at the observation window opening, and the end of the glass abuts against the glass end abutting frame. The end of the shielding sealing press-fit strip abuts against the glass end abutting frame, and the buckling extrusion frame clamps and fixes the glass and the shielding sealing press-fit strip to the inner side of the glass limiting side plate. The part, making contact with the glass, of the shielding sealing press-fit strip is a closed side, and the part, abutting against the inner side of the glass limiting side plate, of the shielding sealing press-fit strip is a clamping positioning side. The window has an electromagnetic pulse shielding function, and internal conditions can be observed by observing the glass at the window opening.

Description

Technical Field

[0001] The invention relates to the technical field of shielding doors, in particular to an electromagnetic pulse shielding door. Background Art

[0002] With the rapid development of information technology and the widespread application of electronic equipment, the problem of electromagnetic pulse interference and damage to electronic equipment and systems has become increasingly prominent. Electromagnetic pulses may come from natural phenomena such as lightning and solar wind, or from artificial electromagnetic weapons or the operation of high-power electronic equipment. These electromagnetic pulses can penetrate conventional materials and cause instantaneous high voltage and high current shocks to the circuits and components inside electronic equipment, resulting in equipment damage, data loss, and even system paralysis. Therefore, the research and development of electromagnetic pulse protection technology, especially electromagnetic pulse shielding doors, is particularly important.

[0003] In order to deal with the hazards of electromagnetic pulses, electromagnetic shielding technology came into being. Electromagnetic shielding refers to the ability to block or absorb electromagnetic waves using appropriate materials or structures. Electromagnetic shielding technology can be divided into three categories according to the principle: electric field shielding, magnetic field shielding, and electromagnetic shielding. Among them, electromagnetic shielding is mainly used to prevent electromagnetic induction at high frequencies. It isolates the mutual coupling of variable electromagnetic fields by utilizing the reflection of electromagnetic waves on the surface of the conductor and the sharp attenuation of propagation in the conductor, thereby preventing interference from high-frequency electromagnetic fields.

[0004] Although the electromagnetic pulse shielding doors currently on the market have met the protection needs to a certain extent, they still have some shortcomings. For example, the current shielding doors are generally integrated structures, and after closing, the situation inside the shielding room cannot be observed from the outside.

[0005] Therefore, it is urgent to design an electromagnetic shielding door that has electromagnetic pulse shielding function and is conducive to observing the internal situation. Summary of the invention

[0006] The purpose of the present invention is to provide an electromagnetic pulse shielding door to solve the problems existing in the above-mentioned prior art, which has an electromagnetic pulse shielding function and can observe the internal situation through the glass at the observation window.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides an electromagnetic pulse shielding door, comprising:

[0009] The shielding door body; the shielding door body is provided with an observation window opening, a glass end positioning module is fixed to the side wall of the observation window opening, the glass end positioning module comprises a glass end abutment frame fixedly connected to the inner side wall of the observation window opening, and a glass limiting side plate extending toward the center direction of the observation window opening is fixed on one side of the glass end abutment frame;

[0010] The glass is made of Flint glass (leaded glass) and has a radiation protection function to ensure that radiation does not leak to the outside; the glass is installed at the opening of the observation window, and the end of the glass is abutted against the glass end abutment frame;

[0011] A shielding sealing pressing strip, an end of which abuts against the glass end abutting frame, an outer side of the shielding sealing pressing strip abuts against an inner side of the glass limiting side plate, a buckling extrusion frame is fixedly installed on one end of the glass end positioning module away from the glass limiting side plate, the buckling extrusion frame presses against the glass, and clamps and fixes the glass and the shielding sealing pressing strip on the inner side of the glass limiting side plate; the portion of the shielding sealing pressing strip in contact with the glass is a closed side, the cross section of the closed side is a semicircular arc shape, the portion of the shielding sealing pressing strip abutting against the inner side of the glass limiting side plate is a clamping positioning side, and the closed side and the clamping positioning side are an integrated molding structure;

[0012] A sound insulation sheet, fixedly arranged on the inner side of the shielding door body;

[0013] The ventilation mechanism includes a ventilation fan fixedly arranged on the inner side of the shielding door body, the air inlet of the ventilation fan is sealedly connected with an air exchange duct, the end of the air exchange duct is connected with a solenoid valve, when the solenoid valve is turned on, the air exchange duct can communicate with the space outside the shielding door body, when the solenoid valve is turned off, the air exchange duct can communicate with the space inside the shielding door body.

[0014] Optionally, the solenoid valve comprises:

[0015] A valve body, one end of which is provided with a gas communication port, the valve body is provided with an outer airflow channel communicating with the outer space of the shielding door body, the outer airflow channel can communicate with the gas communication port, and the end of the gas communication port is sealed and communicated with an end of the air exchange duct away from the ventilation fan;

[0016] A valve core, comprising an iron column and an iron core, wherein the iron column is movably arranged in the valve body and is located below the gas communication port of the valve body, the iron core is arranged below the iron column, and the upper part of the iron core is located in the valve body, the inner wall of the bottom of the valve body is sealed with the outer wall of the upper part of the iron core, and the bottom of the iron core is provided with an inner air flow channel communicating with the inner side of the shielding door body;

[0017] The outer shell is arranged outside the valve body, the top of which is sealed and connected with the clamping groove on the valve body, and the bottom of which is clamped with the middle groove of the outer wall of the middle part of the iron core;

[0018] The electromagnetic part is arranged on the outside of the valve body. When the electromagnetic part is energized, the iron column moves to the first position, at which time the gas connecting port and the outer air flow channel are connected; when the electromagnetic part is de-energized, the iron column moves away from the first position, at which time the outer air flow channel and the gas connecting port are not connected, and the gas connecting port is connected to the inner air flow channel.

[0019] Optionally, an axial through hole is opened in the middle of the closed side; a wear-resistant layer is provided on the outer surface of the closed side, a waterproof layer is glued to the inner layer of the wear-resistant layer, and a corrosion-resistant layer is glued to the outer surface of the clamping and positioning side; a plurality of axially equidistantly distributed reinforcing rods are integrated in the axial through hole.

[0020] Optionally, the iron core is fixedly arranged below the iron column, and a sealing piece is movably provided in the iron core, and the sealing piece can close the inner airflow channel at the bottom of the iron core, and a first spring is abutted on the top of the sealing piece, and one end of the first spring away from the sealing piece is fixedly abutted on the bottom of the boss on the inner wall of the iron core, and a second spring is fixedly abutted on the top of the boss on the inner wall of the iron core, and the top of the second spring is connected to the bottom of the iron column, and the iron column can move away from the valve body after the electromagnetic part is energized.

[0021] Optionally, the glass end abutment frame of the glass end positioning module is composed of metal ribs located on the upper, lower, left and right sides of the observation window opening respectively; the interior of the shielding door body is provided with a first metal mesh layer and a second metal mesh layer, and the shielding door body is provided with metal mesh sealing strips around it.

[0022] Optionally, the first metal mesh layer is woven from copper wires.

[0023] Optionally, the second metal mesh layer is woven from copper wires.

[0024] Optionally, an arc-shaped groove is provided at a position where the glass is connected to the shielding sealing pressing strip, and the closed side is fixedly clamped in the arc-shaped groove.

[0025] Optionally, closed ends are provided at both ends of the clamping and positioning side, and a strip suction cup-like structure is formed between the two closed ends, which can be fixedly adsorbed on the glass limiting side plate.

[0026] Optionally, the metal mesh sealing strip is woven from copper wire and nylon wire.

[0027] Compared with the prior art, the present invention has achieved the following technical effects:

[0028] The present invention provides glass on the shielding door body, which ensures the electromagnetic shielding effect while facilitating observation of the situation behind the door; the glass and the shielding sealing pressing strip are positioned and clamped by the glass end positioning module and the buckle extrusion frame, and a uniform sealing clamping force can be applied to ensure better sealing effect and electromagnetic shielding effect, and is easy to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of the structure of the electromagnetic pulse shielding door of the present invention;

[0031] Figure 2 It is a cross-sectional schematic diagram of the observation window opening of the electromagnetic pulse shielding door of the present invention;

[0032] Figure 3 It is a schematic diagram of the glass end abutment frame of the electromagnetic pulse shielding door of the present invention;

[0033] Figure 4 This is a schematic diagram of the electromagnetic valve of the present invention being energized and the ventilation fan being connected to the outer space of the shield door body;

[0034] Figure 5 This is a schematic diagram of the electromagnetic valve of the present invention being powered off and the ventilation fan being connected to the inner space of the shield door body;

[0035] Figure 6 It is a schematic diagram of the connection between the ventilation fan and the air exchange duct of the present invention.

[0036] In the figure: 1-shielding door body, 2-glass end positioning module, 201-glass end abutment frame, 202-glass limiting side plate, 3-second spring, 4-snap-in extrusion frame, 5-sound insulation plate, 6-observation window opening, 7-glass; 8-ventilation fan, 9-air exchange duct, 10-valve body, 11-electromagnetic coil, 12-iron column, 13-first spring, 14-iron core, 15-housing, 16-blocking piece, 17-inner air flow channel, 18-gas connecting port, 19-outer air flow channel, 20-pin plug. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The purpose of the present invention is to provide an electromagnetic pulse shielding door to solve the problems existing in the above-mentioned prior art, which has an electromagnetic pulse shielding function and can observe the internal situation through the glass at the observation window.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the present invention provides an electromagnetic pulse shielding door, including a shielding door body 1, which is installed at the door frame of a shielding room. The specific structures of the shielding room and the door frame, and the connection and installation method of the shielding door body 1 and the door frame belong to the prior art, so the present invention will not be repeated; when the shielding door body 1 is closed, in order to realize the observation of the interior of the shielding room, the present invention is unique in that an observation window opening 6 is provided on the shielding door body 1, and a glass end positioning module 2 is fixed at the side wall of the observation window opening 6, and the glass end positioning module 2 includes a glass end abutment frame 201 fixedly connected to the inner wall of the observation window opening 6, and a glass limiting side plate 202 extending toward the center direction of the observation window opening 6 is fixed on one side of the glass end abutment frame 201; glass is provided at the observation window opening 6, and the glass is made of Flint glass (lead-containing glass) and has a radiation protection function to ensure that radiation will not leak to the outside.

[0041] During installation, the glass 7 is placed at the observation window opening 6, and the four ends of the glass 7 are abutted against the glass end abutment frame 201 at the corresponding positions; in order to achieve the electromagnetic shielding effect and sealing effect at the installation position of the glass 7, a shielding sealing pressing strip is designed in this embodiment, and a metal sheet layer is provided inside the shielding sealing pressing strip. The end of the shielding sealing pressing strip is abutted against the glass end abutment frame 201, and the outer side surface of the shielding sealing pressing strip is abutted against the inner side surface of the glass limiting side plate 202. The glass end positioning module 2 is fixedly installed with a snap-fit ​​extrusion frame 4 at one end away from the glass limiting side plate 202. The snap-fit ​​extrusion frame 4 is pressed against the glass to clamp the glass 7 and the shielding sealing pressing strip on the inner side of the glass limiting side plate 202.

[0042] In a preferred embodiment, the present invention designs a ventilation mechanism, The ventilation mechanism includes a fixed device arranged on the shielding door Ventilation fan inside the main body 1 8. The air inlet of the ventilation fan 8 is sealed and connected with an air exchange duct 9, and the end of the air exchange duct 9 is connected with a solenoid valve. When the solenoid valve is turned on, the air exchange duct 9 can be connected with the space outside the shielding door body 1 to realize ventilation between indoor and outdoor spaces. When the solenoid valve is disconnected, the air exchange duct 9 can be connected with the space inside the shielding door body 1 to realize self-circulation of air in the indoor space. The ventilation fan 8 can always be in the open stage, and ventilation with the outdoors or self-circulation of air in the room can be achieved by controlling the solenoid valve.

[0043] The solenoid valve of this embodiment includes a valve body 100, a gas communication port 18 is provided at the upper end of the valve body 100, an outer air flow channel 19 is opened at one end of the valve body 100 close to the gas communication port 18, and a communication port is provided between the outer air flow channel 19 and the gas communication port 18; the lower part of the valve body 10 is similar to a cylindrical structure with an opening at the bottom, in which a valve core is provided, and the valve core includes an iron column 12 and an iron core 14, the iron column 12 is provided inside the valve body 10, the iron core 14 is provided at the bottom of the iron column 12, and the upper part of the iron core 14 is located in the valve body 10, and The inner wall at the bottom of the valve body 10 and the outer wall at the top of the iron core 14 are sealed and connected by a sealing ring or other structure to prevent air leakage. The middle and lower parts of the iron core 14 are located outside the valve body 10; the valve body 10 is provided with an electromagnetic part, and the electromagnetic part is provided with a shell 15. The shell 15 of the present invention is an iron shell, the top of which is sealed and connected with the card groove on the valve body 10, and the bottom of which is carded with the middle groove 18 of the outer wall of the middle part of the iron core 14. The bottom of the iron core 14 is provided with an inner airflow channel 17, and a plugging member 16 is movably provided in the iron core 14. The plugging member 1 6 can close the inner air flow channel 17 at the bottom of the iron core 14 so that it is not connected to the inside of the iron core 14. The top of the blocking member 16 is abutted with the first spring 13. One end of the first spring 13 away from the blocking member 16 is fixedly abutted against the bottom of the boss on the inner wall of the iron core 14. The top of the boss on the inner wall of the iron core 14 is fixedly abutted with the second spring 3. The top of the second spring 3 is connected to the bottom of the iron column 12. The electromagnetic part includes an electromagnetic coil 11. One end of the electromagnetic coil 11 is connected to a pin pin 20. The pin pin 20 is used for external power supply. The electromagnetic coil 11 is located outside the valve body 10. After the electromagnetic coil 11 is energized, under the action of electromagnetic induction, the iron column 12 can move up and down in the electromagnetic coil 11 along the center line of the valve body 10. When the electromagnetic coil 11 is energized, the iron column 12 moves downward to the first position. At this time, the gas connecting port 18 is connected to the outer air flow channel to achieve ventilation with the outside. The iron column 12 moves downward and squeezes the second spring 3. The outer air flow channel 19 is connected to the gas connecting port 18. At this time, it is the first position of the iron column 12.

[0044] When the electromagnetic coil 11 is powered off, the iron column 12 moves upward to the second position, at which time the outer air flow channel is closed, and the gas connecting port is connected to the inner air flow channel to realize the self-circulation of indoor gas; the electromagnetic coil 11 is powered off, and the electromagnetic force on the iron column 12 disappears. At this time, under the action of the restoring force of the second spring 3, the iron column 12 is pushed upward until the outer air flow channel 19 and the gas connecting port are closed, so that the two are no longer connected. Under the suction action of the ventilation fan, the gas enters from the inner air flow channel 17 at the lower end of the iron core 14, deforming the top of the first spring 13, and the blocking member 16 moves upward to open the inner air flow channel 17. The gas flows from the iron core 14 into the channel where the first spring 13 and the second spring 3 are located, and flows from the channel opening at the top of the iron core 14 into the gap between the iron column 12 and the valve body 10, and enters the gas connecting port 18 through the gap between the outer wall of the iron column 12 and the inner wall of the valve body 10. At this time, it is the second position.

[0045] In a preferred embodiment, the portion of the shielding seal pressing strip that contacts the glass is the closed side. The cross section of the closed side in this embodiment is a semicircular arc shape, which can be closely connected with the glass to ensure the sealing effect. In order to further achieve the sealing function, an arc groove is provided at the position where the glass and the shielding seal pressing strip are connected, and the closed side is fixedly clamped in the arc groove, which has a good fixed sealing effect. The portion of the shielding seal pressing strip that abuts against the inner side of the glass limiting side plate 202 is the clamping and positioning side. The closed side and the clamping and positioning side are an integrated molding structure for easy fixation. In one embodiment, closed ends are provided at both ends of the clamping and positioning side, and a strip suction cup-shaped structure is formed between the two closed ends, which can be fixedly adsorbed on the glass limiting side plate 202 to achieve a fixed and sealed connection with the glass limiting side plate 202. In another embodiment, the cross section of the clamping and positioning side can be designed as an elliptical structure with a smooth outer wall, which can be fixedly abutted against the glass limiting side plate 202, and can also achieve a sealing effect.

[0046] In a preferred embodiment, a sound insulation sheet 5 is provided on the inner side of the shielding door body 1. The sound insulation sheet 5 is a 2 mm thick fiberboard and can play a good sound insulation role.

[0047] The shielding seal pressing strip in this embodiment can completely fill the gap between the inner side of the shielding door body 1 and the glass 7, thereby achieving a better electromagnetic shielding effect. In addition, the glass end positioning module 2 and the snap-fit ​​extrusion frame 4 are used to position and clamp the glass and the shielding seal pressing strip, which can ensure that a uniform sealing clamping force is applied to the glass 7 and the shielding seal pressing strip, ensuring a better sealing shielding effect, and the installation of the glass and the shielding seal pressing strip is very convenient.

[0048] In this embodiment, the outer surface of the closed side is provided with a wear-resistant layer, the inner layer of the wear-resistant layer is glued with a waterproof layer, and the outer surface of the clamping and positioning side is glued with a corrosion-resistant layer. The outer layer of the wear-resistant layer is treated with a nickel-copper layer by vacuum electroplating; the wear-resistant layer is a 0.2mm thick silver paste layer.

[0049] Preferably, an axial through hole is provided in the middle of the closed side, and a plurality of axially equidistantly distributed reinforcing rods are integrally provided inside the axial through hole. By providing an axial through hole in the middle of the closed side, the weight of the closed side can be effectively reduced, materials can be saved, and costs can be further reduced; by providing a plurality of axially equidistantly distributed reinforcing rods in the middle of the axial through hole, the structural strength of the through hole can be effectively ensured.

[0050] In order to facilitate disassembly and assembly, the glass end positioning module 2 is respectively located on the upper side, lower side, left side and right side of the observation window opening 6, and its structure includes a glass end abutment frame 201 composed of four metal ribs spliced ​​together, and a glass limit side plate 202 is fixedly provided on the glass end abutment frame 201. There is a small splicing gap between the metal ribs, and the metal ribs are provided with positioning threaded holes, so that the glass end positioning module 2 can be fixed on the shielding door body 1 by threaded connection. Similarly, the buckle extrusion frame 4 is composed of four metal pressure strips respectively located on each side of the glass, and corresponding threaded holes are set on the metal pressure strips and metal ribs, and the metal pressure strips can be fixed to the metal ribs by threaded connection, which is convenient for installation and disassembly.

[0051] In order to achieve the electromagnetic shielding effect, the shielding door body 1 of this embodiment is provided with a first metal mesh layer and a second metal mesh layer inside, and a metal mesh cloth sealing strip is provided around the shielding door body 1. The outer side of the shielding door body 1 is galvanized for protection, and the outer side of the shielding door body 1 is a 0.8mm galvanized layer, which can make the shielding door body 1 not easily damaged.

[0052] In a preferred embodiment, the first metal mesh layer is woven from copper wires, the second metal mesh layer is woven from copper wires, and the metal mesh sealing strip is woven from copper wires and nylon wires.

[0053] The present invention adopts a shielding door body 1 with electromagnetic shielding function and is installed on the door frame of the shielding room. Glass is provided on the shielding door body 1 to ensure the electromagnetic shielding effect while facilitating observation of the situation behind the door. The glass and the shielding sealing pressing strip are positioned and clamped by the glass end positioning module 2 and the snap-fit ​​extrusion frame 4, and a uniform sealing clamping force can be applied to ensure better sealing effect and electromagnetic shielding effect, and it is easy to disassemble and assemble.

[0054] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An electromagnetic pulse shielding door, characterized in that: include: The shielding door body; the shielding door body is provided with an observation window opening, a glass end positioning module is fixed to the side wall of the observation window opening, the glass end positioning module comprises a glass end abutment frame fixedly connected to the inner side wall of the observation window opening, and a glass limiting side plate extending toward the center direction of the observation window opening is fixed on one side of the glass end abutment frame; Glass, the glass is installed at the opening of the observation window, and the end of the glass abuts against the glass end abutment frame; A shielding sealing pressing strip, an end of which abuts against the glass end abutting frame, an outer side of the shielding sealing pressing strip abuts against an inner side of the glass limiting side plate, a buckling extrusion frame is fixedly installed on one end of the glass end positioning module away from the glass limiting side plate, the buckling extrusion frame presses against the glass, and clamps and fixes the glass and the shielding sealing pressing strip on the inner side of the glass limiting side plate; the portion of the shielding sealing pressing strip in contact with the glass is a closed side, the cross section of the closed side is a semicircular arc shape, the portion of the shielding sealing pressing strip abutting against the inner side of the glass limiting side plate is a clamping positioning side, and the closed side and the clamping positioning side are an integrated molding structure; A sound insulation sheet, fixedly arranged on the inner side of the shielding door body; The ventilation mechanism includes a ventilation fan fixedly arranged on the inner side of the shielding door body, the air inlet of the ventilation fan is sealed and connected with an air exchange duct, the end of the air exchange duct is connected with a solenoid valve, when the solenoid valve is powered off, the air exchange duct can be connected with the space outside the shielding door body, when the solenoid valve is disconnected, the air exchange duct can be connected with the space inside the shielding door body.

2. The electromagnetic pulse shielding door according to claim 1, characterized in that: The solenoid valve comprises: A valve body, one end of which is provided with a gas communication port, the valve body is provided with an outer airflow channel communicating with the outer space of the shielding door body, the outer airflow channel can communicate with the gas communication port, and the end of the gas communication port is sealed and communicated with an end of the air exchange duct away from the ventilation fan; A valve core, comprising an iron column and an iron core, wherein the iron column is movably arranged in the valve body and is located below the gas communication port of the valve body, the iron core is arranged below the iron column, and the upper part of the iron core is located in the valve body, the inner wall of the bottom of the valve body is sealed with the outer wall of the upper part of the iron core, and the bottom of the iron core is provided with an inner air flow channel communicating with the inner side of the shielding door body; The outer shell is arranged outside the valve body, the top of which is sealed and connected with the clamping groove on the valve body, and the bottom of which is clamped with the middle groove of the outer wall of the middle part of the iron core; The electromagnetic part is arranged on the outside of the valve body. When the electromagnetic part is energized, the iron column moves to the first position, at which time the gas connecting port and the outer air flow channel are connected; when the electromagnetic part is de-energized, the iron column moves away from the first position, at which time the outer air flow channel and the gas connecting port are not connected, and the gas connecting port is connected to the inner air flow channel.

3. The electromagnetic pulse shielding door according to claim 1, characterized in that: An axial through hole is opened in the middle of the closed side; a wear-resistant layer is arranged on the outer surface of the closed side, a waterproof layer is glued to the inner layer of the wear-resistant layer, and a corrosion-resistant layer is glued to the outer surface of the clamping and positioning side; a plurality of axially equidistantly distributed reinforcing rods are integrated in the axial through hole.

4. The electromagnetic pulse shielding door according to claim 2, characterized in that: The iron core is fixedly arranged below the iron column, and a sealing piece is movably provided in the iron core, and the sealing piece can close the inner airflow channel at the bottom of the iron core, and a first spring is abutted on the top of the sealing piece, and one end of the first spring away from the sealing piece is fixedly abutted on the bottom of the boss on the inner wall of the iron core, and a second spring is fixedly abutted on the top of the boss on the inner wall of the iron core, and the top of the second spring is connected to the bottom of the iron column, and the iron column can move away from the valve body after the electromagnetic part is energized.

5. The electromagnetic pulse shielding door according to claim 1, characterized in that: The glass end abutment frame of the glass end positioning module is composed of metal ribs located on the upper, lower, left and right sides of the observation window opening; the inside of the shielding door body is provided with a first metal mesh layer and a second metal mesh layer, and the shielding door body is provided with metal mesh sealing strips around it.

6. The electromagnetic pulse shielding door according to claim 5, characterized in that: The first metal mesh layer is woven from copper wires.

7. The electromagnetic pulse shielding door according to claim 5, characterized in that: The second metal mesh layer is woven from copper wires.

8. The electromagnetic pulse shielding door according to claim 1, characterized in that: An arc-shaped groove is provided at the position where the glass is connected to the shielding sealing pressing strip, and the closed side is fixedly clamped in the arc-shaped groove.

9. The electromagnetic pulse shielding door according to claim 1, characterized in that: The two ends of the clamping and positioning side are provided with closed ends, and a strip suction cup-like structure is formed between the two closed ends, which can be fixedly adsorbed on the glass limiting side plate.

10. The electromagnetic pulse shielding door according to claim 5, characterized in that: The metal mesh sealing strip is woven from copper wire and nylon wire.

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