A signal shielding control method

Abstract

The present application relates to a kind of signal shielding control methods, including door leaf and door frame, when door leaf is closed, air pump is inflated to shielding piece, shielding piece is filled in the round recess of annular arrangement in door frame reinforcing rib after being inflated;When the air pressure of shielding piece reaches the predetermined pressure value, controller closes air path and air pump, and shielding piece enters the pressure maintaining stage;When the controller receives the opening door signal, the controller controls the opening of shielding piece exhaust valve and enters the pressure relief opening stage.The present application provides a kind of signal shielding door control method capable of realizing automatic, intelligent, reliable control, with state monitoring, fault diagnosis, automatic maintenance and emergency backup capability, ensuring the long-term stability and safety of the electromagnetic shielding environment of nuclear magnetic resonance room.

Description

Technical Field

[0001] This invention relates to the field of signal shielding door technology, and more particularly to the field of electromagnetic shielding door technology. Background Technology

[0002] Equipment such as magnetic resonance imaging (MRI) generates strong static magnetic fields and radio frequency signals during operation, and its sophisticated internal detection systems are extremely sensitive to external electromagnetic interference. Therefore, MRI rooms must be equipped with highly efficient electromagnetic shielding to prevent internal signal leakage and external interference intrusion. The shielding door, as a key moving component of this sealed shielded room, directly determines the integrity of the entire room when closed. Traditional MRI room shielding doors primarily rely on mechanical clamping methods to achieve electrical contact sealing between the door leaf and the frame, such as using multiple clamping points or elastic metal gaskets.

[0003] However, such solutions have obvious drawbacks in practical applications: 1. Uneven and inconsistent sealing pressure: Multi-point mechanical clamping makes it difficult to ensure completely uniform contact pressure at all points around the door leaf, which may lead to poor local contact and form a "gap antenna" for electromagnetic leakage. This problem will be further aggravated by mechanical deformation of the door or wear of the gasket over a long period of time, and the shielding effectiveness will decrease.

[0004] 2. Inconvenient and uncertain operation: Some gas-sealed systems rely on manual control or simple electrical switches for inflation, making precise synchronization with door status impossible. Operators may forget to inflate or deflate, resulting in the door operating in an incompletely sealed state, or causing significant resistance or even damage to the seals when opening due to insufficient pressure relief.

[0005] 3. Lack of intelligent status monitoring and self-recovery capabilities: Existing solutions generally lack real-time monitoring and closed-loop control of sealing status (such as internal pressure). Once gas leakage occurs due to aging, minor damage, or accidental factors, the system cannot automatically detect it and replenish the pressure in time. The shielding effectiveness will continue to decline unnoticed, posing a safety hazard. At the same time, the system also lacks the ability to diagnose faults in the inflation circuit itself.

[0006] 4. Long-term maintenance difficulties and performance degradation: Dust, debris, and other contaminants easily accumulate on the contact surfaces between the shielding components (especially inflatable sealing strips) and the door frame channels during long-term use. These contaminants not only scratch the surface of the seals, accelerating their aging, but also create tiny gaps on the contact surfaces, severely weakening the shielding effect for high-frequency signals. Traditional maintenance requires frequent manual cleaning, a cumbersome process that may affect the normal operation of the equipment.

[0007] 5. Lack of emergency response and fault handling mechanisms: When the main sealing system (such as the inflation air circuit) fails, the existing equipment usually lacks an effective backup sealing mechanism, which may force the shielded room to shut down, affecting the order of diagnosis and treatment. In addition, in cases such as blockage of the pressure relief and exhaust passage, the door may not be able to open normally, causing operational problems. Summary of the Invention

[0008] In response to the aforementioned technical bottlenecks, there is an urgent need in this field for a signal shielding door control method that can achieve automatic, intelligent, and reliable control, and possesses the capabilities of status monitoring, fault diagnosis, automatic maintenance, and emergency backup, so as to fundamentally solve the above problems and ensure the long-term stability and safety of the electromagnetic shielding environment in the nuclear magnetic resonance chamber.

[0009] A method for controlling a signal shielding device, the signal shielding device including a door leaf and a door frame, includes the following steps: (1) Closing and pressurizing stage: When the door is closed, the sensor set at the corresponding position of the door and the door frame is turned on, and the turn-on signal is sent to the controller. The controller controls the air pump and the air passage of the shield set in the circumferential direction of the door to open. At the same time, the air pump starts. After the air pump inflates the shield, the shield is filled in the rounded groove set in the door frame reinforcing rib in the circumferential direction. The air is inflated until the air pressure of the shield reaches the predetermined pressure value. (2) Pressure holding stage: When the air pressure of the shielding component reaches the predetermined pressure value, the controller shuts off the air circuit and the air pump, and the shielding component enters the pressure holding stage; (3) Pressure relief opening stage: When the controller receives the door opening signal, the controller controls the shielding component to open the exhaust valve to enter the pressure relief opening stage.

[0010] Specifically, in the signal shielding device control method, in step (1), the air pump inflates the shielding component through multiple air paths in stages: First, the controller controls the air path one between the air pump and the shielding component to open, and starts the air pump to inflate the shielding component in the first stage. When the air pressure of the shielding component reaches the first pressure value, the air path one is closed, and at the same time, the air path two between the air pump and the shielding component is opened. The air pump inflates the shielding component in the second stage. When the air pressure of the shielding component reaches the second pressure value, the air path two and the air pump are closed, and the pressure holding stage is entered.

[0011] Specifically, in the signal shielding device control method, during the multi-channel graded inflation process, after the inflation pump and the shielding component's air path one is opened, a timer is started. If the air pressure of the shielding component does not reach the first pressure value within a first time threshold, air path one is determined to be faulty, and air path one is closed, triggering a low-level inflation warning signal. Simultaneously, the inflation pump and the shielding component's air path two is opened and a timer is started. If the air pressure of the shielding component does not reach the second pressure value within a second time threshold, air path two is determined to be faulty. At this time, if the system has not issued a low-level inflation warning signal, air path two is closed, and air path one is opened for inflation until the air pressure value reaches the second pressure value. If the system has already issued a low-level inflation warning signal, air path two is closed, and a high-level inflation warning signal is triggered.

[0012] Specifically, in the signal shielding device control method, when a high-level inflation warning signal is activated, the controller controls the electric telescopic component to start, and the shielding component fills the rounded groove under the drive of the electric telescopic component.

[0013] Specifically, the signal shielding device control method, after entering the pressure holding stage, when the detected pressure is lower than the second pressure value, turns on the air pump and air circuit two, so that the pressure value rises to the second pressure value and then shuts off, and activates a low-level inflation warning signal.

[0014] Specifically, in the signal shielding device control method, in step (3), when the controller receives the door opening signal, the controller sends a signal to open the shielding component exhaust valve, and the high-pressure gas in the shielding component is discharged at high speed from the nozzle of the exhaust component along the same direction to the circular groove via the exhaust valve.

[0015] Specifically, in the signal shielding device control method, in step (3), after the shielding component and the exhaust valve of the exhaust component are opened, the timing is recorded. If the air pressure does not reach the third pressure value within the third time threshold, the exhaust component is determined to be faulty, a low-level venting warning signal is activated, and the air circuit three of the air pump and the exhaust component is opened at the same time.

[0016] Specifically, in the signal shielding device control method, in step (3), after the shielding component and the exhaust valve of the exhaust component are opened, a timer is run. If the air pressure does not reach the fourth pressure value within the fourth time threshold, a high-level venting warning signal is activated, and the backup exhaust port is opened to release pressure.

[0017] Specifically, in the signal shielding device control method, the third time threshold is less than the fourth time threshold, and the third pressure value is greater than the fourth pressure value.

[0018] Specifically, in the signal shielding device control method, in step (2), the controller controls the signal detector to operate, and when a signal leakage is detected, a leakage warning signal is activated.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. Ensure uniform sealing pressure and improve shielding effectiveness. The shielding component uses air pressure to fill the rounded groove to achieve sealing, significantly increasing the sealing area. Compared with traditional mechanical pressure points, it can achieve continuous and uniform pressure in the circumferential direction of the door leaf, effectively eliminating local leakage points caused by uneven pressure, thereby obtaining higher and more stable overall electromagnetic shielding effectiveness.

[0020] 2. Achieve fully automatic and highly reliable sealing and opening. The shielding component uses a three-stage closed-loop control of "pressure boosting-pressure holding-pressure releasing" and is automatically linked with the door status (sensor) and user commands (door opening signal), completely eliminating the uncertainty and risk of forgetting in manual operation, ensuring that the door reaches the standard shielding state every time it is closed, and that the door opens easily and smoothly every time it is opened.

[0021] 3. Achieve a smooth and controllable pressure build-up process. The shielding component adopts multi-channel staged inflation (such as low pressure first and then high pressure), which avoids the impact damage that may be caused to the shielding component by instantaneous high pressure inflation in a single air channel. This allows the shielding component to expand more smoothly and gently and fit into the groove, extending the service life of the seal.

[0022] 4. Possesses online fault diagnosis and early warning capabilities for the inflation system. By setting time and pressure thresholds for each stage of the inflation process, the shielding component allows the system to automatically determine whether there are blockages, leaks, or pump malfunctions in air circuit one and air circuit two. The tiered activation of low-level and high-level warning signals provides maintenance personnel with clear fault location and urgency assessment, enabling predictive maintenance; furthermore, air circuit one and air circuit two are mutually reinforcing, and the shielding function can be temporarily maintained even if either one fails.

[0023] 5. Ensures the accuracy of pressure setting. The shielding component is inflated in stages, with preset pressure values ​​(first pressure value, second pressure value) as switching and termination points, ensuring that the final sealing pressure is accurate and controllable, and avoiding damage from insufficient inflation or overpressure.

[0024] 6. Provides emergency backup in case of main sealing system failure. When a high-level inflation failure (such as complete gas line failure) is detected, the electric expansion joint automatically activates as a backup mechanical seal, and the temporary support shield forms a seal. This mechanism ensures that the shielded room can maintain basic shielding function or safely complete the current inspection in the event of a main system failure, avoiding interruption of diagnostic and treatment activities due to sudden failures.

[0025] 7. Achieve dynamic maintenance of sealing pressure and self-compensation for leakage. The shielding component continuously monitors the pressure during the pressure holding phase. If the pressure drops below the standard value (second pressure value) due to slow leakage, the system can automatically initiate the pressure replenishment process. This constitutes a dual insurance mechanism of "initial pressure sealing + continuous monitoring and pressure replenishment," effectively combating pressure decay caused by material penetration or minor damage, and maintaining shielding reliability in the long term.

[0026] 8. Automatic cleaning of the sealing interface using depressurized gas. When the door is opened to release pressure, the discharged high-pressure gas is directed to the nozzle of the exhaust component to blow away the contact surface between the shielding component and the rounded groove. This effectively removes accumulated dust and debris, keeps the contact surface clean, thus stabilizing the shielding performance over the long term and significantly reducing the frequency and workload of subsequent manual maintenance.

[0027] 9. Forming an air film reduces door opening resistance. The gas discharged from the contact surface of the exhaust component forms a thin air layer in the gap, which plays a role in lubrication and resistance reduction. This prevents the shielding component from shrinking and deforming in time during prolonged inflation, thus affecting door opening and improving user experience and the smoothness and reliability of equipment operation.

[0028] 10. Enhanced cleaning performance and door opening assistance. When the exhaust system cannot meet the needs of cleaning and door opening, the air pump can be controlled to supply additional air to the exhaust system, forcibly increasing the airflow and pressure, further improving the cleaning effect, and more effectively assisting in opening the door.

[0029] 11. Possesses fault diagnosis and emergency handling capabilities for the pressure relief and exhaust channels. By monitoring the pressure drop rate and time during the pressure relief process of the shielding component (third / fourth time threshold, third / fourth pressure value), the system can intelligently determine whether the exhaust nozzle is blocked (low-level warning) or whether the exhaust channel has a serious fault (high-level warning). In the event of a serious fault, the system automatically activates the backup exhaust port to directly relieve pressure, fundamentally preventing serious operational accidents such as "the door being sucked in and unable to be opened" due to the inability to relieve pressure, thus ensuring the basic operability of the equipment.

[0030] 12. Provides direct verification of final shielding effectiveness. During the pressure holding phase, the operation of the signal detector for leak detection is the final verification of the entire sealing system from a functional perspective. Once a leak is detected, an alarm is triggered immediately, providing the most reliable safety net and ensuring that any potential seal failure (even under normal pressure but with material defects) is detected promptly.

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. Attached Figure Description

[0032] Figure 1 : Structural diagram of the invention; Figure 2 : Cross-sectional view of the present invention (AA); Figure 3 Detailed drawing I; Figure 4 : Schematic diagram of reinforcing ribs; Figure 5 Cross-sectional view of the shielding component; Figure 6 Airbag illustration Figure 1 ; Figure 7 : Schematic diagram of exhaust components; Figure 8 Flowchart of graded inflation and troubleshooting; Figure 9 Flowchart for pressure relief activation and fault handling; Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0033] Example 1: Basic Control Flow The signal shielding device of this embodiment is a shielding door for a nuclear magnetic resonance imaging (MRI) room, mainly including a door leaf 100, a door frame 200, a shielding component 300, sensors, a controller, and a pneumatic system. The door leaf 100 is circumferentially fitted with an inflatable shielding component 300. The shielding component 300 has an internal airbag structure 301 and an external double-layer copper mesh conductive sleeve 302. A groove 201 with a rounded (arc-shaped) cross-section is provided on the door frame 200 at a position corresponding to the shielding component 300. This groove 201 is located within the circumferential reinforcing ribs 202 of the door frame and is used to accommodate the expanded shielding component 300. Sensors (such as proximity switches or magnetic sensors) are located at corresponding positions on the door leaf 100 and the door frame 200 to detect whether the door leaf is fully closed.

[0034] The controller, as the core of the control system, can be implemented using a PLC, a microcontroller, or a dedicated control circuit. Its signal input terminal is connected to a sensor, and its control output terminal is connected to the air circuit system and the air pump. The air circuit system includes the air pump, the air circuit (which can be further subdivided into multiple stages), the air inlet valve located at the air inlet end of the shield 300, and the air outlet valve located at the air outlet end.

[0035] The signal shielding device control method of this embodiment includes the following stages: S1: Closing and Pressurization Stage. When the door leaf 100 closes to the door frame 200, the sensor is triggered, generating a closing signal and sending it to the controller. The controller then issues a control command: start the air pump and open the air inlet valve of the shield 300, opening the air passage (while ensuring the exhaust valve is closed). The gas generated by the air pump enters the cavity of the shield 300 through the opened air passage, causing it to gradually expand. After the shield 300 is inflated, its outer surface tightly fills and adheres to the rounded groove 201 on the door frame 200, forming a continuous and uniform circumferential sealed contact, thereby achieving electromagnetic signal shielding.

[0036] S2: Pressure Holding Stage. During the closed pressurization stage, the controller monitors the air pressure inside the shield 300 in real time or intermittently (via a pressure sensor). When the air pressure reaches the predetermined pressure value, the controller issues a command to first close the air inlet valve to cut off the air path, and then stop the air pump. At this time, the shield 300 maintains the predetermined pressure value in the sealed cavity, entering the pressure holding stage and maintaining a stable shielding state.

[0037] S3: Pressure Relief and Opening Phase. When the door needs to be opened, the operator triggers the door opening button (sending an opening signal) or the controller receives other door opening instructions. The controller first controls the exhaust valve of the shielding component 300 to open. The high-pressure gas inside the shielding component 300 is quickly discharged through the exhaust valve, its volume shrinks, and it disengages from the rounded groove 201. After the gas pressure drops to a safe value, the door 100 can be easily opened, completing a full closing-shielding-opening cycle.

[0038] Example 2: Staged inflation and fault diagnosis As a further optimization of Example 1, this example focuses on explaining the multi-channel staged inflation control and fault diagnosis logic during the closed-loop pressurization stage.

[0039] The airbag structure 301 is specifically configured as an outer airbag 301a and an inner airbag 301b. The air circuit system is specifically configured to include two parallel inflation branches: air circuit one and air circuit two, which are respectively connected to the outer airbag 301 and the inner airbag 301b. Each branch is controlled by an independent valve (a first valve and a second valve, respectively). The diameter of air circuit one can be designed to be larger for initial rapid inflation; the diameter of air circuit two is smaller for subsequent low-speed inflation to reach the rated pressure. The controller is connected to a pressure sensor and an air circuit fault alarm.

[0040] The closed-loop boosting phase specifically includes: Closed-loop pressurization stage S11: First-stage inflation. After the inflation pump starts, the controller only opens the first valve (air path one) and closes the second valve (air path two). The inflation pump inflates the outer airbag 301 of the shield 300 through air path one. The controller starts timing simultaneously (T1).

[0041] Closed-loop pressurization phase S12: First-stage pressure judgment and fault diagnosis. The controller continuously compares the air pressure with the first pressure value P1 (closed-loop pressurization phase P1 < closed-loop pressurization phase P2). If the air pressure reaches P1 before or after the timer reaches the first time threshold T1_th, the process proceeds smoothly to step S13. If the timer has exceeded T1_th and the air pressure has not yet reached P1, the controller determines that there is a fault in air circuit one (possibly a blockage or leak). The controller then closes the first valve and activates a low-level inflation warning signal (such as a flashing yellow indicator light) to prompt maintenance personnel to check air circuit one. At the same time, the process proceeds to inflation step S13.

[0042] Closed pressurization stage S13: Secondary inflation. The controller closes the first valve and simultaneously opens the second valve (air path two). Inflation then proceeds through air path two, and the inflation pump inflates the airbag 301b inside the shield 300 through air path two.

[0043] Closed pressurization phase S14: Secondary inflation and fault diagnosis. Simultaneously with opening air path two, the controller resets and starts a new timer (T2). The controller continuously compares the air pressure with the second pressure value P2 (predetermined pressure value). If the air pressure reaches P2 before or at the second time threshold T2_th, the system smoothly enters the pressure holding phase S2. If the timer has exceeded T2_th and the air pressure has not yet reached P2, the controller determines that air path two is faulty or has a serious leak. At this time, if no low-level inflation warning signal is issued in step S12, it indicates that air path one is working normally. The controller closes the second valve, opens the first valve, and the inflation pump inflates the outer airbag 301 to P2 through air path one. If a low-level inflation warning signal is issued in step S12, it indicates that both air path one and air path two are faulty. The controller then closes the second valve, stops the inflation pump, and activates a high-level inflation warning signal (such as a continuous red indicator light), while simultaneously executing step S15.

[0044] Closed pressurization phase S15: Activate the backup seal. Upon receiving a high-level inflation warning signal, the controller immediately activates the electric telescopic component (such as a miniature electric push rod), causing the shield 300 to be pressed into the rounded groove 201 under mechanical force, thus realizing a temporary backup mechanical seal. This ensures basic shielding function in the event of a failure of the current inflation system, buying time for maintenance.

[0045] Example 3: Pressure Holding, Pressure Replenishment, and Pressure Relief Cleaning This embodiment further optimizes the maintenance function during the pressure holding stage and the additional function during the pressure relief opening stage, based on embodiment 2.

[0046] The system includes an exhaust component 400, which comprises a pipe with a nozzle 401 and an air passage three (controlled by a third valve). The outlet of the exhaust valve can be selectively connected to the air inlet of the exhaust component 400. A signal detector is also connected to the controller.

[0047] Supplementary procedures during the pressure holding stage: Pressure holding phase S21: Continuous pressure monitoring. During the pressure holding phase, the controller continues to periodically monitor the air pressure within the shield 300.

[0048] Pressure holding phase S22: Leakage detection and automatic pressure replenishment. If a pressure drop is detected and falls below the second pressure value P2 (e.g., below 95% of P2), the controller determines that a slow leak exists. At this time, the controller automatically restarts the air pump and opens the second valve (air path two) to replenish the pressure.

[0049] Pressure holding phase S23: Pressure replenishment complete. Once the air pressure returns to P2, the controller closes the second valve and stops the air pump, restoring the pressure holding state. This process achieves dynamic maintenance and self-repair of the sealing pressure.

[0050] Pressure Holding Stage S24: Final Shielding Verification (Optional). Upon entering the pressure holding stage, the controller can activate the signal detector to scan the area around the door seam. If electromagnetic signal leakage exceeding the threshold is detected, the controller will activate a leakage warning signal regardless of whether the pressure value is normal, indicating a possible abnormality such as physical damage to the shielding components.

[0051] The specific procedures for the pressure relief initiation phase are as follows: Pressure Relief Opening Phase S31: Triggering and Pressure Relief. When the controller receives an opening signal, it controls the exhaust valve to open, connecting its outlet to the pipeline of the exhaust component 400. The high-pressure gas inside the shield 300 is not directly discharged to the atmosphere, but is guided through the exhaust valve to the exhaust component 400, and ejected at high speed from its nozzle 401. The nozzle 401 is designed to align in the same direction with the contact area between the shield 300 and the rounded groove 201.

[0052] Effects during the pressure relief and opening phase: The high-speed airflow effectively blows away dust and impurities adhering to the contact surface. Simultaneously, the air film formed between the contact surfaces acts as a lubricant, significantly reducing opening resistance.

[0053] Pressure relief opening phase S32: Exhaust fault diagnosis. The controller starts timing (T3) after opening the exhaust passage and monitors the air pressure value. A third pressure value P3 and a third time threshold T3_th (higher P3, shorter T3_th) are set to determine minor blockages.

[0054] Pressure Relief Opening Phase S33: If the pressure characteristic reaches P3 within T3_th during the pressure relief opening phase, it indicates that the venting is unobstructed and the venting device is working normally. Continue depressurizing until completion. If the pressure characteristic is greater than P3 at T3_th during the pressure relief opening phase, it is determined that the venting device may be slightly blocked, and the controller activates a low-level venting warning signal (such as an indicator light). At this time, enhanced auxiliary cleaning and door opening are achieved. That is, while opening the venting valve, the controller opens the third valve (air path three) and starts the air pump. The gas provided by the air pump also flows into the venting device 400 through air path three, enhancing the flow rate and pressure of the cleaning airflow, further improving the cleaning effect and assisting in opening the door. Simultaneously, proceed to step S34.

[0055] Pressure Relief Opening Phase S34: Emergency Response to Severe Exhaust Failure. A fourth pressure value P4 and a fourth time threshold T4_th are set (P4 is lower, T4_th is longer, and pressure relief opening phase T3_th < pressure relief opening phase T4_th, pressure relief opening phase P3 > pressure relief opening phase P4) to determine severe failures. If the pressure characteristic reaches P4 within T4_th, pressure relief continues until completion. If, during the longer T4_th, the pressure characteristic still fails to reach the lower P4 during the pressure relief opening phase, a severe exhaust path failure is determined. The controller activates a high-level venting warning signal (such as an audible and visual alarm). Simultaneously, the controller immediately controls the opening of a backup vent (such as an emergency valve directly connected to the atmosphere) for direct venting, forcibly and quickly expelling the gas within the shielding component 300, ensuring that the door 100 can be opened promptly under any circumstances, preventing "locking" due to poor venting.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for controlling a signal shielding device, the signal shielding device comprising a door leaf and a door frame, comprising the following steps: (1) Closing and pressurizing stage: When the door is closed, the sensor set at the corresponding position of the door and the door frame is turned on, and the turn-on signal is sent to the controller. The controller controls the air pump and the air passage of the shield set in the circumferential direction of the door to open. At the same time, the air pump starts. After the air pump inflates the shield, the shield is filled in the rounded groove set in the door frame reinforcing rib in the circumferential direction. The air is inflated until the air pressure of the shield reaches the predetermined pressure value. (2) Pressure holding stage: When the air pressure of the shielding component reaches the predetermined pressure value, the controller shuts off the air circuit and the air pump, and the shielding component enters the pressure holding stage; (3) Pressure relief opening stage: When the controller receives the door opening signal, the controller controls the shielding component to open the exhaust valve to enter the pressure relief opening stage.

2. The signal shielding device control method according to claim 1, characterized in that: In step (1), the air pump inflates the shielding component through multiple air paths in stages: First, the controller controls the air path one between the air pump and the shielding component to open, and starts the air pump to inflate the shielding component in the first stage. When the air pressure of the shielding component reaches the first pressure value, the air path one is closed, and at the same time, the air path two between the air pump and the shielding component is opened. The air pump inflates the shielding component in the second stage. When the air pressure of the shielding component reaches the second pressure value, the air path two and the air pump are closed, and the pressure holding stage begins.

3. The signal shielding device control method according to claim 2, characterized in that: During the multi-channel staged inflation process, after the inflation pump and shielding component's air channel one is opened, a timer is started. If the shielding component's air pressure does not reach the first pressure value within the first time threshold, air channel one is determined to be faulty, and air channel one is closed, triggering a low-level inflation warning signal. Simultaneously, the inflation pump and shielding component's air channel two is opened and a timer is started. If the shielding component's air pressure does not reach the second pressure value within the second time threshold, air channel two is determined to be faulty. At this point, if the system has not issued a low-level inflation warning signal, air channel two is closed, and air channel one is opened for inflation until the air pressure value reaches the second pressure value. If the system has already issued a low-level inflation warning signal, air channel two is closed, and a high-level inflation warning signal is triggered.

4. The signal shielding device control method according to claim 3, characterized in that: When the high-level inflation warning signal is activated, the controller activates the electric telescopic component, and the shielding component fills the rounded groove under the drive of the electric telescopic component.

5. The signal shielding device control method according to claim 1, characterized in that: After entering the pressure holding stage, when the detected pressure is lower than the second pressure value, the air pump and air circuit two are turned on to raise the pressure value to the second pressure value and then shut off, and a low-level inflation warning signal is activated.

6. The signal shielding device control method according to claim 1, characterized in that: In step (3), when the controller receives the door opening signal, the controller sends a signal to open the shield exhaust valve. The high-pressure gas in the shield is discharged at high speed from the nozzle of the exhaust component along the same direction into the circular groove through the exhaust valve.

7. A signal shielding device control method according to claim 1 or 6, characterized in that: In step (3), after the shield and the exhaust valve of the exhaust component are opened, the timer is started. If the air pressure does not reach the third pressure value within the third time threshold, the exhaust component is determined to be faulty, a low-level venting warning signal is activated, and the air circuit three of the air pump and the exhaust component is opened at the same time.

8. The signal shielding device control method according to claim 7, characterized in that: In step (3), after the shield and exhaust valve of the exhaust component are opened, the timer is started. If the air pressure does not reach the fourth pressure value within the fourth time threshold, a high-level venting warning signal is activated and the backup exhaust port is opened to release pressure.

9. A signal shielding device control method according to claim 8, characterized in that: The third time threshold is less than the fourth time threshold, and the third pressure value is greater than the fourth pressure value.

10. A signal shielding device control method according to claim 1, characterized in that: In step (2), the controller controls the signal detector to run, and when a signal leakage is detected, a leakage warning signal is activated.

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