Electromagnetic shielding effectiveness test box device

Abstract

The utility model discloses a kind of electromagnetic shielding effectiveness test box body devices, including shielding box, PLC controller fixedly connected on shielding box, mounting box fixedly connected in shielding box inside, clamping assembly installed on mounting box, module plug installed on mounting box.The utility model can quickly replace wave-absorbing plate and module plug of different material, adapt multiple frequency bands, multiple types test demand, without overall reconstruction equipment;Push out assembly and vice door assembly simplify the operation process of measured piece installation, assembly replacement, greatly shorten test preparation time, improve test efficiency, replace assembly through magnetic attraction mode fixed wave-absorbing plate, reduce electromagnetic interference in combination with copper foil protective layer, clamping assembly ensures that module plug connection is stable, sealing assembly is realized efficient sealing by annular sealing air bag, three synergies reduce electromagnetic leakage and external interference, guarantee test environment stability, improve the accuracy and reliability of test data.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic shielding effectiveness testing chamber technology, and specifically to an electromagnetic shielding effectiveness testing chamber device. Background Technology

[0002] Electromagnetic shielding effectiveness testing chambers are key testing equipment used to accurately evaluate the electromagnetic shielding performance of various electronic devices or components. Their performance directly affects the accuracy and reliability of the test results, playing an irreplaceable role in fields with extremely high electromagnetic compatibility requirements, such as electronic communications, aerospace, and defense industries. In existing technologies, the working principle of electromagnetic shielding effectiveness testing chambers is roughly as follows: A chamber with a suitable volume is selected based on the size of the device under test and the specific testing requirements. This chamber is generally made of materials with certain electromagnetic absorption properties; common materials include cold-rolled steel plates with absorbing pads, absorbing foam boards, and multi-layer composite absorbing boards. Different materials have different absorption efficiencies for electromagnetic waves in different test frequency bands, enabling targeted handling of electromagnetic interference in specific frequency bands.

[0003] During testing, the device under test (DUT) is securely placed inside the enclosure, and then the enclosure is connected to external equipment via a specialized connector. A signal source emits electromagnetic signals of specific frequency and intensity, which are transmitted through the enclosure to the DUT. Upon receiving the electromagnetic signals, the DUT will exhibit different reactions, such as reflection, absorption, or transmission. Monitoring instruments then meticulously detect and analyze these reactions to ultimately determine the DUT's electromagnetic shielding effectiveness.

[0004] However, existing technical solutions have several problems that urgently need to be addressed. First, electromagnetic shielding testing requires precise selection of the corresponding absorbing material based on the test frequency band of the device under test (DUT). However, current test enclosures clearly lack flexibility in structural design and material compatibility. When dealing with different DUTs, it is difficult to quickly and conveniently adjust the absorbing material; when the test frequency band changes and the absorbing material needs to be replaced, the operation is cumbersome and time-consuming. This not only significantly increases the preparation time and operational difficulty of the test but also severely limits the versatility and compatibility of the test. This results in extremely low testing efficiency and makes it impossible to meet diverse testing needs.

[0005] Secondly, as a critical connection component between the test enclosure and external equipment, the connector's lack of modular design directly undermines the core logic of "signal adaptation, absorption optimization, and convenient maintenance." Non-modular connectors often require customized design and installation for specific devices when connecting different equipment. This means that every time a device is replaced, a new connector needs to be redesigned and manufactured. This not only significantly increases production and operating costs but also necessitates complex reconnection operations during equipment replacement or maintenance. Sometimes, it may even require damaging the original structure to complete the connection. This not only leads to poor test compatibility but may also affect the absorption effect of the absorbing material on electromagnetic waves due to improper connection, thus compromising shielding effectiveness.

[0006] Furthermore, airtightness is a crucial factor for electromagnetic shielding test chambers to prevent electromagnetic leakage and maintain the stability of the test environment. In existing technologies, the sealing design of some test chamber devices has significant flaws. Poor sealing directly undermines the core function of "shielding and isolation." During testing, if electromagnetic leakage occurs, the shielding effectiveness will fail, resulting in severely distorted test data that cannot accurately reflect the true electromagnetic shielding performance of the device under test. Simultaneously, electromagnetic leakage may also interfere with or even damage external equipment, affecting the stability of the test environment. This impact persists throughout the entire testing process, significantly jeopardizing the accuracy and reliability of the test. Utility Model Content

[0007] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide an electromagnetic shielding effectiveness testing chamber device that allows for quick replacement of absorbing plates and module plugs made of different materials, adapting to multi-frequency bands and various testing needs without requiring overall equipment modification. The introduction of the component and the secondary door component simplifies the operation process of installing the test device and replacing components, significantly shortening the test preparation time and improving test efficiency. The replacement component fixes the absorbing plate by magnetic attraction, and the copper foil protective layer reduces electromagnetic interference. The snap-fit ​​component ensures a stable connection of the module plug, and the sealing component achieves efficient sealing through an annular sealing airbag. The three components work together to reduce electromagnetic leakage and external interference, ensure a stable test environment, and improve the accuracy and reliability of test data.

[0008] The purpose of this utility model is achieved by the following technical solution: an electromagnetic shielding effectiveness testing chamber device, including a shielding box, a PLC controller fixedly connected to the shielding box, an installation box fixedly connected to the inside of the shielding box, a snap-fit ​​assembly installed on the installation box, a module plug installed on the installation box, an ejection assembly installed on the shielding box, a sliding frame installed on the ejection assembly, a replacement assembly installed on the shielding box, a wave-absorbing plate installed on the replacement assembly, a sealing assembly installed on the shielding box, a cabinet door installed on the sealing assembly, and a secondary door assembly and a cover plate installed on the secondary door assembly are provided on the shielding box; The snap-fit ​​assembly is used to secure the replacement module plug; the push-out assembly is used to push the sliding frame out or pull it back into the shielding box; the replacement assembly is used to replace the absorber plate of different materials; the sealing assembly is used to control the cabinet door to close and seal the shielding box; and the secondary door assembly allows for easy operation of the snap-fit ​​assembly and replacement assembly inside the shielding box by opening and closing the cover.

[0009] In one optional embodiment, the replacement component includes a fixed plate fixedly connected to the mounting box, a spring fixedly connected to one end of the fixed plate, an I-shaped plate fixedly connected to the other end of the spring, and arc-shaped clamping plates fixedly connected to both ends of the I-shaped plate. The I-shaped plate is provided with a sliding groove, and the I-shaped plate is slidably connected to the fixed plate through the sliding groove. The module plug is slidably connected to the mounting box.

[0010] In one alternative implementation, when the I-beam slides, the arc-shaped clamp will move closer to or further away from the module plug, and the module plug will be fixed or unfixed.

[0011] In one optional embodiment, the ejection assembly includes an electric push rod fixedly connected to the shielding box, a connecting rod with one end fixedly connected to the output end of the electric push rod, and a placement clamp mounted on the sliding frame. The other end of the connecting rod is fixedly connected to the sliding frame, and the placement clamp is fixedly connected to the sliding frame by bolts. The electric push rod is used to push the connecting rod to slide.

[0012] In one alternative implementation, when the sliding frame moves away from the mounting box, it will push the placement clamp out of the shielding box; when the sliding frame moves closer to the mounting box, it will push the placement clamp back into the shielding box.

[0013] In one optional embodiment, the replacement component includes several magnets 1 fixedly connected to the inside of the shielding box and several magnets 2 fixedly connected to the wave-absorbing plate. The magnets 1 and 2 have opposite magnetic properties and their surfaces are both covered with a copper foil protective layer.

[0014] In one optional embodiment, the secondary door assembly includes quick-release clamps fixed to both ends of the shielding box and latches fixedly connected to both ends of the cover plate, with the quick-release clamps rotatably connected to the shielding box.

[0015] In one optional embodiment, the sealing assembly includes a fixed base fixedly connected to the shielding box, an electric push rod II rotatably connected to the fixed base, an air pump fixedly connected to the cabinet door, an annular sealing airbag fixedly connected to the cabinet door and surrounding its groove, and a connecting block with one end rotatably connected to the output end of the electric push rod II. The other end of the connecting block is fixedly connected to the cabinet door, and the cabinet door is rotatably connected to the shielding box. The electric push rod II is used to push the cabinet door on the connecting block to rotate on the shielding box. When the cabinet door is away from the shielding box, the shielding box is in the open state. When the cabinet door gradually approaches and fits against the shielding box, the air pump will fully inflate the annular sealing airbag to fit against the inner wall of the shielding box to form a seal.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Different materials of absorbing plates and module plugs can be quickly replaced to adapt to multi-frequency band and multi-type test requirements without the need for overall equipment modification; the introduction of components and sub-door components simplifies the operation process of installing the test device and replacing components, greatly shortens the test preparation time, and improves test efficiency.

[0017] 2. The replacement component uses magnetic attraction to fix the absorbing plate, combined with a copper foil protective layer to reduce electromagnetic interference. The snap-fit ​​component ensures a secure connection of the module plug, and the sealing component achieves efficient sealing through a ring-shaped sealing airbag. The three work together to reduce electromagnetic leakage and external interference, ensure a stable testing environment, and improve the accuracy and reliability of test data. Attached Figure Description

[0018] Figure 1 A perspective view of an electromagnetic shielding effectiveness testing chamber device; Figure 2 This is a three-dimensional view of an electromagnetic shielding effectiveness testing chamber from another angle. Figure 3 A schematic diagram of the structure of the component being launched; Figure 4 A structural diagram for replacing components; Figure 5 A structural diagram of the replacement component; Figure 6 This is a schematic diagram of the sealing assembly.

[0019] In the diagram: 1. Shielding box; 21. Mounting box; 22. Fixing plate; 23. Spring; 24. I-beam plate; 25. Arc-shaped clamping plate; 26. Module plug; 27. Connecting rod; 28. Electric push rod one; 29. ​​Placement clamp; 210. Quick clamp; 211. Cover plate; 212. Buckle; 213. Sliding frame; 214. Magnet one; 215. Wave-absorbing plate; 216. Magnet two; 31. Fixing base; 32. Electric push rod two; 33. Connecting block; 34. Cabinet door; 35. Annular sealing airbag; 36. Inflation pump; 4. PLC controller. Detailed Implementation

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, the internal connection of two elements, or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0024] Please refer to Figure 1-6An electromagnetic shielding effectiveness testing chamber device includes a shielding box 1, a PLC controller 4 fixedly connected to the shielding box 1, a mounting box 21 fixedly connected to the inside of the shielding box 1, a snap-fit ​​assembly mounted on the mounting box 21, a module plug 26 mounted on the mounting box 21, an ejection assembly mounted on the shielding box 1, a sliding frame 213 mounted on the ejection assembly, a replacement assembly mounted on the shielding box 1, a wave-absorbing plate 215 mounted on the replacement assembly, a sealing assembly mounted on the shielding box 1, a cabinet door 34 mounted on the sealing assembly, and a secondary door assembly and a cover plate 211 mounted on the secondary door assembly. The snap-fit ​​assembly is used to fix the replacement module plug 26, the push-out assembly is used to push out or pull back the sliding frame 213 into the shielding box 1, the replacement assembly is used to replace the absorber plate 215 of different materials, the sealing assembly is used to control the cabinet door 34 to close and seal the shielding box 1, and the secondary door assembly facilitates the operation of the snap-fit ​​assembly and replacement assembly inside the shielding box 1 by opening and closing the cover plate 211. The shielding box 1 provides a closed environment for testing, and the PLC controller 4 realizes automated control to reduce human operation errors. The snap-fit ​​assembly, replacement assembly, push-out assembly, sealing assembly and secondary door assembly have clear division of labor and work together to meet the component replacement needs of multi-scenario testing, and ensure the sealing performance of the shielding box 1, thereby improving the versatility and practicality of the device.

[0025] In a preferred embodiment of this utility model, the replacement component includes a fixing plate 22 fixedly connected to the mounting box 21, a spring 23 fixedly connected to the fixing plate 22 at one end, an I-shaped plate 24 fixedly connected to the other end of the spring 23, and an arc-shaped clamping plate 25 fixedly connected to both ends of the I-shaped plate 24. The I-shaped plate 24 has a sliding groove, and the I-shaped plate 24 is slidably connected to the fixing plate 22 through the sliding groove. The module plug 26 is slidably connected to the mounting box 21. The fixing plate 22 provides a stable mounting base for the clamping component. The spring 23 and the I-shaped plate 24 cooperate to achieve elastic clamping of the arc-shaped clamping plate 25. The replacement and fixing of the module plug 26 can be completed without complicated tools. The operation is convenient and the fixing effect is stable, avoiding the module plug 26 from loosening during the test and affecting signal transmission.

[0026] In a preferred embodiment of this utility model, when the I-beam plate 24 slides, the arc-shaped clamping plate 25 will move closer to or further away from the module plug 26, and the module plug 26 will be fixed or unfixed. The sliding of the I-beam plate 24 drives the arc-shaped clamping plate 25 to accurately move closer to or further away from the module plug 26, the switching process is smooth, and different specifications of module plugs 26 can be quickly adapted, improving the efficiency of component replacement, while ensuring the stability of the module plug 26 after installation and ensuring the continuity of test signal transmission.

[0027] In a preferred embodiment of this utility model, the component includes an electric push rod 28 fixedly connected to the shielding box 1, a connecting rod 27 with one end fixedly connected to the output end of the electric push rod 28, and a placement clamp 29 mounted on the sliding frame 213. The other end of the connecting rod 27 is fixedly connected to the sliding frame 213, and the placement clamp 29 is fixedly connected to the sliding frame 213 by bolts. The electric push rod 28 is used to push the connecting rod 27 to slide. The electric push rod 28 provides stable power, and the connecting rod 27 has precise transmission, which can drive the sliding frame 213 to smoothly enter and exit the shielding box 1. The placement clamp 29 is fixed by bolts, which is convenient to adjust or replace according to the size of the test piece, ensuring that the test piece is installed firmly and avoiding positional displacement due to vibration during the test.

[0028] In a preferred embodiment of this utility model, when the sliding frame 213 moves away from the mounting box 21, the sliding frame 213 will push the placement clamp 29 out of the shielding box 1. When the sliding frame 213 moves closer to the mounting box 21, the sliding frame 213 will push the placement clamp 29 back into the shielding box 1. The movement of the sliding frame 213 in and out enables convenient picking and placing of the test piece without requiring the operator to go deep into the shielding box 1. This improves operational safety, avoids touching internal components and affecting the testing environment, and shortens the time for installing and removing the test piece, thus improving the smoothness of the testing process.

[0029] In a preferred embodiment of this utility model, the replacement component includes several magnets 214 fixedly connected to the inside of the shielding box 1 and several magnets 216 fixedly connected to the absorbing plate 215. The magnets 214 and 216 have opposite magnetic properties and their surfaces are covered with a copper foil protective layer. The magnetic attraction connection between the magnets 214 and 216 allows the absorbing plate 215 to be replaced without tools, making the operation quick and without damaging the structure of the shielding box 1. The copper foil protective layer can reduce the interference of the magnets on electromagnetic signals, ensure the absorption effect of the absorbing plate 215, and at the same time enhance the corrosion resistance of the magnets and extend the service life of the component.

[0030] In a preferred embodiment of this utility model, the secondary door assembly includes quick-release clamps 210 fixed to both ends of the shielding box 1 and buckles 212 fixedly connected to both ends of the cover plate 211. The quick-release clamps 210 are rotatably connected to the shielding box 1. The quick-release clamps 210 and buckles 212 cooperate to realize the quick opening and closing of the cover plate 211. No complex locking structure is required, which makes it convenient for operators to maintain or replace the snap-fit ​​components and replacement components inside the shielding box 1, and improves the ease of maintenance of the device.

[0031] Please refer to Figure 6In a preferred embodiment of this utility model, the sealing assembly includes a fixed base 31 fixedly connected to the shielding box 1, an electric push rod 32 rotatably connected to the fixed base 31, an air pump 36 fixedly connected to the cabinet door 34, an annular sealing airbag 35 fixedly connected to the cabinet door 34 and surrounding its groove, and a connecting block 33 with one end rotatably connected to the output end of the electric push rod 32. The other end of the connecting block 33 is fixedly connected to the cabinet door 34, and the cabinet door 34 is rotatably connected to the shielding box 1. The electric push rod 32 is used to push the cabinet door 34 on the connecting block 33 onto the shielding box 1. When the cabinet door 34 moves away from the shielding box 1, the shielding box 1 is in the open state. As the cabinet door 34 gradually approaches and fits against the shielding box 1, the air pump 36 will fully inflate the annular sealing airbag 35 to fit against the inner wall of the shielding box 1 and form a seal. The electric push rod 32 drives the cabinet door 34 to precisely fit against the shielding box 1. After the annular sealing airbag 35 is inflated, it forms an all-round seal. The sealing effect is far superior to the traditional sealing structure, effectively blocking electromagnetic leakage and external interference. The air pump 36 automatically controls the inflation process, with a high degree of automation, reducing manual intervention and ensuring the consistency and reliability of the seal.

[0032] When working, first set the relevant test parameters through PLC controller 4, and then operate the auxiliary door assembly: rotate the quick clamps 210 at both ends of the shield box 1 to disengage the latch 212 and open the cover 211 to facilitate subsequent operation of the internal components.

[0033] Replace the appropriate absorbing plate 215 according to the test frequency band requirements: Utilizing the opposite magnetic properties of magnet 1 214 and magnet 216 of the replacement component, remove the original absorbing plate 215 from the inside of the shielding box 1 and replace it with an absorbing plate 215 of the corresponding material. The copper foil protective layer on the surface of the magnet can reduce electromagnetic interference, ensuring that the absorbing plate 215 is firmly attached and does not affect the shielding performance.

[0034] Replace the compatible module plug 26: The I-shaped plate 24 on the sliding mounting box 21 slides along the groove of the fixing plate 22, the spring 23 is compressed, the arc-shaped clamping plate 25 moves away from the module plug 26, the original module plug 26 is released from the fixation, after taking it out, the new module plug 26 is inserted, the I-shaped plate 24 is released, the spring 23 rebounds and drives the arc-shaped clamping plate 25 to approach and clamp the module plug 26, and the fixation is completed.

[0035] When the ejection assembly is activated, the PLC controller 4 controls the electric push rod 28 to extend, which in turn drives the sliding frame 213 away from the mounting box 21 via the connecting rod 27. The placement fixture 29 on the sliding frame 213 then slides out of the shielding box 1, fixing the test piece onto the placement fixture 29. Then, the electric push rod 28 is controlled to retract, causing the sliding frame 213 and the placement fixture 29 to retract back into the shielding box 1.

[0036] Close the cover plate 211 and lock the quick clamp 210. Start the sealing assembly: PLC controller 4 controls electric push rod 32 to push connecting block 33, causing cabinet door 34 to rotate towards and fit against shielding box 1. Then, air pump 36 starts, inflating the annular sealing airbag 35 on cabinet door 34, ensuring it completely fits against the inner wall of shielding box 1 to form a seal. After sealing, connect external testing equipment via module plug 26 to conduct electromagnetic shielding effectiveness testing. After testing, remove the tested component, replace the component, or shut down the equipment following the reverse process.

[0037] Although only certain components and embodiments of this application have been illustrated and described, many modifications and alterations will be apparent to those skilled in the art without actually departing from the scope and spirit of the claims, such as variations in the size, dimensions, structure, shape and proportion of the various elements, installation arrangement, material use, color, orientation, etc.

[0038] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An electromagnetic shielding effectiveness test chamber apparatus, characterized by: Includes a shielding box (1), a PLC controller (4) fixedly connected to the shielding box (1), a mounting box (21) fixedly connected to the inside of the shielding box (1), a snap-fit ​​assembly installed on the mounting box (21), a module plug (26) installed on the mounting box (21), an ejection assembly installed on the shielding box (1), a sliding frame (213) installed on the ejection assembly, a replacement assembly installed on the shielding box (1), a wave-absorbing plate (215) installed on the replacement assembly, a sealing assembly installed on the shielding box (1), a cabinet door (34) installed on the sealing assembly, a secondary door assembly provided on the shielding box (1), and a cover plate (211) installed on the secondary door assembly; The snap-fit ​​assembly is used to fix the replacement module plug (26), the push-out assembly is used to push out or pull back the sliding frame (213) into the shielding box (1), the replacement assembly is used to replace the wave-absorbing plate (215) of different materials, the sealing assembly is used to control the cabinet door (34) to close and seal the shielding box (1), and the secondary door assembly facilitates the operation of the snap-fit ​​assembly and replacement assembly inside the shielding box (1) by opening and closing the cover plate (211).

2. The electromagnetic shielding effectiveness test chamber apparatus of claim 1, wherein, The replacement components include a fixed plate (22) fixedly connected to the mounting box (21), a spring (23) fixedly connected to the fixed plate (22) at one end, an I-shaped plate (24) fixedly connected to the other end of the spring (23), and an arc-shaped clamping plate (25) fixedly connected to both ends of the I-shaped plate (24). The I-shaped plate (24) has a sliding groove, and the I-shaped plate (24) is slidably connected to the fixed plate (22) through the sliding groove. The module plug (26) is slidably connected to the mounting box (21).

3. The electromagnetic shielding effectiveness test chamber apparatus of claim 2, wherein, When the I-shaped plate (24) slides, the arc-shaped clamp (25) will move closer to or further away from the module plug (26), and the module plug (26) will be fixed or unfixed.

4. The electromagnetic shielding effectiveness test chamber apparatus of claim 1, wherein, The launching component includes an electric push rod (28) fixedly connected to the shielding box (1), a connecting rod (27) fixedly connected at one end to the output end of the electric push rod (28), and a placement clamp (29) mounted on the sliding frame (213). The other end of the connecting rod (27) is fixedly connected to the sliding frame (213), and the placement clamp (29) is fixedly connected to the sliding frame (213) by bolts. The electric push rod (28) is used to push the connecting rod (27) to slide.

5. The electromagnetic shielding effectiveness test chamber apparatus of claim 4, wherein, When the sliding frame (213) moves away from the mounting box (21), the sliding frame (213) will push the placement clamp (29) out of the shielding box (1). When the sliding frame (213) moves close to the mounting box (21), the sliding frame (213) will push the placement clamp (29) back into the shielding box (1).

6. The electromagnetic shielding effectiveness test chamber apparatus of claim 5, wherein, The replacement components include several magnets (214) fixedly connected to the inside of the shielding box (1) and several magnets (216) fixedly connected to the wave-absorbing plate (215). Magnets (214) and magnets (216) have opposite magnetic properties and their surfaces are covered with a copper foil protective layer.

7. The electromagnetic shielding effectiveness test chamber apparatus of claim 1, wherein, The secondary door assembly includes quick-release clamps (210) fixed at both ends of the shielding box (1) and buckles (212) fixedly connected to both ends of the cover plate (211). The quick-release clamps (210) are rotatably connected to the shielding box (1).

8. The electromagnetic shielding effectiveness test chamber apparatus of claim 1, wherein, The sealing assembly includes a fixed base (31) fixedly connected to the shielding box (1), an electric push rod two (32) rotatably connected to the fixed base (31), an air pump (36) fixedly connected to the cabinet door (34), an annular sealing airbag (35) fixedly connected to the cabinet door (34) and surrounding its groove, and a connecting block (33) rotatably connected at one end to the output end of the electric push rod two (32). The other end of the connecting block (33) is fixedly connected to the cabinet door (34), and the cabinet door (34) is rotatably connected to the shielding box (1). The electric push rod two (32) is used to push the cabinet door (34) on the connecting block (33) to rotate on the shielding box (1). When the cabinet door (34) moves away from the shielding box (1), the shielding box (1) is in the open state. When the cabinet door (34) gradually approaches and fits against the shielding box (1), the air pump (36) will make the annular sealing airbag (35) fully inflated and fit against the inner wall of the shielding box (1) to form a seal.

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