Modular assembled electromagnetic shielding test box

Abstract

This invention discloses a modular, assembled electromagnetic shielding test chamber for electromagnetic shielding testing. During drawer closure, a vertical plate triggers a pry plate to rotate, pushing the plate to press against the intermediate layer, ensuring a tight fit between the beryllium copper alloy anti-leakage layer and the shielding chamber surface. This compensates for the deficiency in shielding effectiveness caused by insufficient contact pressure between the anti-leakage layer and the shielding chamber surface in the top area of ​​the drawer due to large gaps in the shielding chamber. Simultaneously, a built-in thin-film pressure sensor in the intermediate layer monitors the uniformity of the pressing pressure in real time, monitoring the tightness of contact between the anti-leakage layer and the shielding chamber, improving the reliability and efficiency of test results. Through homogenization and adjustment modules, the protrusion of the vertical plate can be flexibly adjusted according to the thinning of the intermediate layer due to aging, ensuring a tight contact between the anti-leakage layer and the shielding chamber surface.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding testing, and in particular to a modular assembled electromagnetic shielding test box. Background Technology

[0002] Modular electromagnetic shielding test chambers, also known as electromagnetic shielding boxes, are primarily used to isolate internal and external electromagnetic interference. This prevents external radiation from affecting the testing of internal precision equipment and also prevents internal signal leakage. Its modular design facilitates quick installation, disassembly, and expansion, making it suitable for R&D laboratories, production lines, or temporary field testing. By providing a controlled shielded environment, it effectively ensures the accuracy and reliability of electronic equipment debugging, RF measurements, and electromagnetic compatibility testing.

[0003] Patent application CN202121977550.0 discloses an impact-resistant drawer-type electromagnetic shielding box. The drawer shielding door and the sliding plate are flexibly connected, thereby reducing the impact and vibration when the drawer shielding door is opened or closed, making the impact-resistant drawer-type electromagnetic shielding box safer and more reliable.

[0004] The patent document with application number CN202121982275.1 discloses a flip-up drawer-type electromagnetic shielded box. When the power source drives the sliding plate to move away from the door panel, the buffer limiter and the slider connecting seat come into contact with each other. It is suitable for testing large-sized products and is also beneficial for cooperating with robotic arms, reducing the difficulty of the robotic arm to bypass obstacles.

[0005] In operation, the aforementioned drawer-type electromagnetic shielding box uses beryllium copper alloy springs installed on the drawer panel surface to ensure the overall conductivity of the shielding box when the drawer panel is closed, preventing electromagnetic leakage during testing. However, in practical operation, to accommodate the testing requirements of large-sized products, especially vehicle-related products, larger openings need to be made on the surface of the shielding box to allow for the smooth passage of large products. Because the connection point between the drawer panel and the mechanism that drives its extension and retraction is located near the lower part of the drawer panel, the adhesion between the beryllium copper alloy springs on the surface of the drawer panel and the surface of the shielding box gradually weakens from bottom to top when the drawer is closed, affecting the overall closure of the shielding box. Therefore, this design needs to be improved. Summary of the Invention

[0006] The core of this invention lies in using the upright plate to trigger the rotation of the pry plate during the drawer closing process, which pushes the plate to squeeze the intermediate layer, making the beryllium copper alloy anti-leakage layer tightly adhere to the surface of the shielding box. This solves the problem in the prior art where the contact pressure between the drawer plate and the surface of the shielding box is uneven due to the large size gap, especially the insufficient contact pressure in areas far from the fixture plate. At the same time, through the homogenization module and the adjustment module, the protrusion degree of the upright plate can be flexibly adjusted according to the thinning of the intermediate layer due to aging, ensuring the tightness of the contact between the anti-leakage layer and the surface of the shielding box.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A modular assembled electromagnetic shielding test box includes a shielding box with a notch on one side surface, a frame installed at the bottom of the shielding box, a cylinder installed inside the frame, and a constraint slider installed at the bottom of the shielding box. A horizontal plate is slidably connected inside the constraint slider, and a drawer plate is fixedly connected to one end of the horizontal plate. A fixture plate is fixed to the surface of the drawer plate. Four sets of auxiliary components are installed on the surface of the shielding box. The auxiliary components include a vertical plate located outside the notch, a movable groove opened inside the drawer plate, and a vertical block fixed to the surface of the drawer plate. A self-resetting shaft is rotatably installed on the surface of the vertical block, and a pry plate is rotatably installed on the surface of the self-resetting shaft. A push plate is installed through the inside of the drawer plate, and the end of the push plate is movably connected to the end of the pry plate through multiple hinge balls. An intermediate layer is installed on the surface of the drawer plate near the shielding box, and a leakage-proof layer is installed on the surface of the intermediate layer away from the surface of the drawer plate. When the self-resetting shaft is arranged horizontally, the distance between it and the surface of the shielding box is less than the distance between the surface of the vertical plate and the surface of the shielding box.

[0009] Furthermore, the width of the active groove is greater than the thickness of the pry plate, and the pushing plate is the same length as the intermediate layer.

[0010] Furthermore, the leak-proof layer is made of beryllium copper alloy spring sheet, the middle layer is made of elastic material, and the surface of the drawer panel is equipped with protrusions with the same cross-sectional area as the notch. The middle layer and the surface of the drawer panel are bonded together by a conductive adhesive layer.

[0011] Furthermore, a measuring component is installed on the inner wall of the shielding box. The measuring component includes two guide rods installed on the inner wall of the shielding box. The surfaces of the two guide rods are slidably connected to guide rods, and the surfaces of the guide rods are slidably fitted with fixing blocks and fixedly fitted with positioning blocks. The bottom of the fixing blocks is connected to a robotic arm, and the surface of the robotic arm is equipped with a camera and a test antenna.

[0012] Furthermore, the top and one side surfaces of the frame are open, and one end of the horizontal plate is connected to the power end of the cylinder component.

[0013] Furthermore, a feedback system is installed on the surface of the shielding box. The feedback system includes a display screen installed on the surface of the shielding box, and a thin-film pressure sensor connected to the display screen signal is arranged between the intermediate layer and the leak-proof layer.

[0014] Preferably, the feedback system further includes an adjustment module, and the adjustment module includes an internal frame embedded in the surface of the shielding box, a base block embedded in the surface of the shielding box, an adjustment rod connected internally to the base block, an insertion rod connected to the end of the adjustment rod through a bushing, the insertion rod being connected to the upright plate, and the internal frame being slidably inserted into the upright plate.

[0015] Furthermore, the feedback system also includes a homogenization module, which includes a homogenization plate with the same cross-sectional shape as the push plate. The surface of the homogenization plate is movably connected to the surface of the prying plate through a hinge ball. The homogenization plate and the push plate are connected by a connecting cable made of non-elastic material, and a homogenization medium is filled between the homogenization plate and the push plate.

[0016] Furthermore, the length values ​​of both the push plate and the homogenizing plate in the top view are greater than the effective pushing value of the pry plate, and the homogenizing medium is silicone oil.

[0017] Compared with the prior art, the advantages of this invention are: (1) This solution uses a cylinder to drive the drawer plate to extend and retract, enabling the test piece to automatically enter and exit the shielding box while avoiding electromagnetic interference from the cylinder working inside the test box that could affect the test results. In addition, during the closing process of the drawer plate, the upright plate triggers the pry plate to rotate, pushing the plate to squeeze the intermediate layer so that the beryllium copper alloy anti-leakage layer is tightly bonded to the surface of the shielding box. This compensates for the defect of insufficient contact pressure between the anti-leakage layer and the surface of the shielding box in the top area of ​​the drawer plate due to the large gap size of the shielding box, which would damage the shielding effectiveness of the shielding box. At the same time, the thin film pressure sensor built into the intermediate layer can monitor the uniformity of the extrusion pressure in real time, which is used to monitor the tightness of the contact between the anti-leakage layer and the shielding box, thereby improving the reliability and efficiency of the test results.

[0018] (2) This solution uses a homogenization module to ensure that the intermediate layer ages and deforms as uniformly as possible under stress. Then, through the sliding connection between the built-in frame and the upright plate, and the linkage drive between the internal thread adjustment rod and the insertion rod, the protrusion degree of the upright plate can be flexibly adjusted according to the thinning of the intermediate layer. When the membrane pressure sensor detects that the compressive force is uniform but decays overall, rotating the adjustment rod will push the upright plate outward, so that the drawer plate will trigger the pry plate to rotate earlier when closing. This will compensate for the pressure loss caused by the deformation of the intermediate layer, ensure a tight contact between the leak-proof layer and the surface of the shielding box, and extend the effective service life of the intermediate layer and the leak-proof layer, reducing the maintenance frequency and replacement cost. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the shielding box of the present invention; Figure 3 This is a schematic diagram of the internal structure of the frame of the present invention; Figure 4 This is a partial top view of the leak-proof layer, intermediate layer, drawer panel, upright panel, prying plate, and push plate of the present invention. Figure 5 This is a schematic diagram showing the arrangement of the drawer panel and movable groove of the present invention; Figure 6This is a schematic diagram of the working state of the pry plate of the present invention; Figure 7 This is a top view of the shielding box, base block, adjusting rod, insert rod, and upright plate of the present invention. Figure 8 This is a schematic diagram of the jig plate, notch, and adjustment modules arranged around the perimeter of the present invention; Figure 9 This is a schematic diagram of the homogenization module of the present invention; Figure 10 This is a top view of the homogenization module of the present invention.

[0020] Explanation of the labels in the diagram: 1. Shielding box; 101. Cylinder component; 102. Constraint slider; 2. Drawer plate; 201. Movable slot; 202. Leakage prevention layer; 203. Intermediate layer; 3. Vertical plate; 301. Pry plate; 302. Self-resetting rotating shaft; 303. Push plate; 304. Homogenization plate; 305. Connecting cable; 4. Fixture plate; 5. Measuring component; 501. Guide rod; 502. Guide rod; 503. Fixing block; 6. Internal frame; 7. Base block; 8. Adjusting rod; 9. Insert rod. Detailed Implementation

[0021] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0022] First implementation method: Please see Figures 1-5 A modular assembled electromagnetic shielding test box includes a shielding box 1 with a notch on one side. A frame is installed at the bottom of the shielding box 1, and a cylinder 101 is installed inside the frame. A constraint slider 102 is installed at the bottom of the shielding box 1. A horizontal plate is slidably connected inside the constraint slider 102. A drawer plate 2 is fixedly connected to one end of the horizontal plate, and a fixture plate 4 is fixed to the surface of the drawer plate 2. Four sets of auxiliary components are installed on the surface of the shielding box 1. The auxiliary components include a vertical plate 3 located outside the notch. A movable groove 201 is opened inside the drawer plate 2, and a vertical block is fixed to the surface of the drawer plate 2. A self-resetting shaft 302 is rotatably mounted on the surface of the drawer panel 2, and a pry plate 301 is rotatably mounted on the surface of the self-resetting shaft 302. A push plate 303 is installed through the interior of the drawer panel 2, and the end of the push plate 303 is movably connected to the end of the pry plate 301 through multiple hinge balls. An intermediate layer 203 is installed on the surface of the drawer panel 2 near the shielding box 1, and a leak-proof layer 202 is installed on the surface of the intermediate layer 203 away from the surface of the drawer panel 2. When the self-resetting shaft 302 (achieved by a spiral spring, which is the prior art) is arranged horizontally, the distance between it and the surface of the shielding box 1 is less than the distance between the surface of the upright plate 3 and the surface of the shielding box 1.

[0023] Please see Figures 4-5The width of the active groove 201 is greater than the thickness of the pry plate 301, and the push plate 303 is the same length as the intermediate layer 203.

[0024] The leak-proof layer 202 is made of beryllium copper alloy spring sheet, the middle layer 203 is made of elastic material, and the surface of the drawer plate 2 is equipped with protrusions with the same cross-sectional area as the notch. The middle layer 203 is bonded to the surface of the drawer plate 2 by a conductive adhesive layer.

[0025] Please see Figure 2 The inner wall of the shielding box 1 is equipped with a measuring component 5. The measuring component 5 includes two guide rods 501 installed on the inner wall of the shielding box 1. The surfaces of the two guide rods 501 are slidably connected to guide rods 502. The surfaces of the guide rods 502 are slidably sleeved with fixing blocks 503 and fixedly sleeved with positioning blocks. The bottom of the fixing block 503 is connected to a robotic arm, and the surface of the robotic arm is equipped with a camera and a test antenna.

[0026] Please see Figure 3 The top and one side surfaces of the frame are open, and one end of the horizontal plate is connected to the power end of the cylinder component 101.

[0027] A feedback system is installed on the surface of the shielding box 1. The feedback system includes a display screen installed on the surface of the shielding box 1. A thin-film pressure sensor connected to the display screen signal is arranged between the intermediate layer 203 and the anti-leakage layer 202.

[0028] Specifically, to facilitate the placement of large-sized test pieces into the shielding box 1, the notch is relatively large. When the cylinder 101 moves the fixture plate 4 (which has a fixing component connected to the test piece, existing technology, and will not be described in detail here) into the shielding box 1, the contact position between the horizontal plate and the drawer plate 2 is close to the bottom of the drawer plate 2. When the cylinder 101 moves the drawer plate 2 to close, the upper area of ​​the anti-leakage layer 202 is less tightly closed with the shielding box 1 than the lower area, which damages the shielding performance of the shielding box 1. Therefore, when performing electromagnetic shielding tests, attention should be paid to the tightness of the contact between the anti-leakage layer 202 and the shielding box 1, and the cross-sectional area of ​​the drawer plate 2 should be larger than the cross-sectional area of ​​the anti-leakage layer 202.

[0029] In this application, the intermediate layer 203, the push plate 303, the pry plate 301, and the drawer plate 2 are all made of conductive materials. The intermediate layer 203 may be made of conductive silicone, the push plate 303 and the pry plate 301 and the hinge ball connecting them may be made of stainless steel, and the drawer plate 2 may be made of galvanized steel.

[0030] Please see Figure 6Before performing electromagnetic shielding testing on the component to be tested (hereinafter referred to as the test piece), the cylinder 101 is used to push the horizontal plate to move, so that the drawer plate 2 can move outward and drive the fixture plate 4 away from the inside of the shielding box 1. Then the test piece is placed on the surface of the fixture plate 4. Subsequently, the cylinder 101 closes, driving the fixture plate 4 back into the inside of the shielding box 1. As the drawer plate 2 is about to close, the pry plate 301, which was originally horizontally arranged (viewed from above), gradually approaches the vertical plate 3 until the end of the pry plate 301 contacts the front surface of the vertical plate 3. The pry plate 301 tilts (viewed from above), driving the push plate 303 to squeeze the intermediate layer 203, thereby strengthening the tightness of the contact between the anti-leakage layer 202 and the surface of the shielding box 1 and the shielding performance of the shielding box 1 during testing. When the fixture plate 4 leaves the notch, the pry plate 301 returns to a horizontal state under the action of the self-resetting rotating shaft 302 (viewed from above).

[0031] When the prying plate 301 is prying, it tilts when viewed from above. The width of the movable groove 201 is designed so that the prying plate 301 can tilt smoothly and then drive the push plate 303 to press vertically against the surface of the intermediate layer 203, thereby strengthening the tightness of the contact between the leak-proof layer 202 and the shielding box 1.

[0032] After placing the device under test (DUT) into shielded enclosure 1, the test is initiated, and a test command is sent to the DUT. Upon receiving the command, the DUT transmits a wireless signal at a specific frequency and power. At this time, the test antenna on the robotic arm inside shielded enclosure 1 captures the wireless signal emitted by the DUT and then transmits it to the integrated test instrument located outside shielded enclosure 1 to analyze its transmission power, frequency accuracy, and other indicators. The DUT's surface status lights or the working status of other related equipment are viewed through a camera (the signal is transmitted via fiber optic cable to avoid interference from the electronic camera to the electromagnetic shielding test, and a wave-absorbing material coating, such as ferrite or wedge-shaped wave-absorbing sponge, is added to the surface of the robotic arm and camera housing to reduce its impact on the test results), making the process more intuitive and reliable.

[0033] In addition, the design of the frame allows the cylinder 101 that drives the jig plate 4 to extend and retract to be located outside the test area of ​​the shielded box 1, thereby preventing the cylinder 101 from causing unnecessary electromagnetic interference to the test piece being tested when it is working.

[0034] During measurement, one of the guide rods 501 is a lead screw. Inside the shielding box 1, a housing made of shielding material (aluminum or other electromagnetic shielding materials can be used, selected by those skilled in the art based on actual usage requirements) is installed. A drive motor is installed inside the housing, and its output end is connected to the end of the guide rod 501, driving the guide rod 502 to move. An electric actuator and a shielding telescopic cover located outside the electric actuator are mounted on the surface of the positioning block. The shielding telescopic cover has a corrugated tube-like structure made of stretchable conductive fabric or elastic conductive material. The power end of the electric actuator and the tail end of the shielding telescopic cover are connected to the surface of the fixed block 503, driving the fixed block 503 to move, indirectly driving the movement of the robotic arm and the test antenna and camera on its surface. To achieve automated movement and adjustment of the test antenna and camera, other methods can also be used, selected by those skilled in the art based on actual usage requirements.

[0035] The drive motor and electric push rod inside the housing and the shielded telescopic cover are all electrical structures. Through the external shielding design, the electrical interference generated during their operation can be prevented from affecting the test results.

[0036] When the drawer plate 2 is closed, the push plate 303 indirectly pushes the intermediate layer 203, thereby strengthening the tightness of the contact between the anti-leakage layer 202 and the surface of the shielding box 1. During this process, the thin film pressure sensor can be used to detect whether the pressure encountered by the intermediate layer 203 is uniform. If it is not uniform, it indicates that the intermediate layer 203 has malfunctioned and needs to be repaired and replaced.

[0037] Second implementation method: Please see Figures 7-8 The feedback system also includes an adjustment module, which includes an internal frame 6 embedded in the surface of the shielding box 1. A base block 7 is embedded in the surface of the shielding box 1. An adjustment rod 8 is threadedly connected inside the base block 7. The end of the adjustment rod 8 is connected to a plug rod 9 through a bushing. The plug rod 9 is connected to the upright plate 3, and the internal frame 6 is slidably inserted into the upright plate 3.

[0038] Specifically, in the first embodiment, as the elasticity of the intermediate layer 203 gradually weakens, after the intermediate layer 203 undergoes uniform aging, and with the degree of protrusion of the upright plate 3 remaining unchanged, the pushing action of the prying plate 301 driving the pushing plate 303 is insufficient to maintain the tight contact between the leak-proof layer 202 and the surface of the shielding box 1 in the initial state. This will lead to a decrease in the shielding effectiveness of the shielding box 1.

[0039] To address this issue, this implementation method is adopted. After the intermediate layer 203 has aged uniformly, the pressure changes detected by the thin-film pressure sensor indicate that although the detected pressure values ​​are uniform, they are all lower than the initial pressure values. At this time, the adjusting rod 8 rotates out of the base block 7, driving the insert rod 9 to move synchronously, thereby causing the upright plate 3 to bulge outward. This allows the drawer plate 2 to contact the end of the pry plate 301 in advance when it is closed, increasing the inclination of the pry plate 301 when the cylinder 101 is closed, thereby increasing the pressing distance of the pushing plate 303, thus ensuring the pressing effect on the leak-proof layer 202, and also extending the service life of the intermediate layer 203.

[0040] Alternatively, by adjusting the contact position between the self-resetting rotating shaft 302 and the pry plate 301, the lever arm of the pry plate 301 can be adjusted, thereby effectively supplementing the pushing distance of the push plate 303 without changing the degree of protrusion of the upright plate 3.

[0041] The third implementation method: Please see Figures 9-10 The feedback system also includes a homogenization module, which includes a homogenization plate 304 with the same cross-sectional shape as the push plate 303. The surface of the homogenization plate 304 is movably connected to the surface of the pry plate 301 through a hinge ball. The homogenization plate 304 and the push plate 303 are connected by a connecting cable 305 made of non-elastic material. The space between the homogenization plate 304 and the push plate 303 is filled with a homogenization medium.

[0042] The length values ​​of the push plate 303 and the homogenizing plate 304 in the top view are both greater than the effective pushing maximum value of the pry plate 301. The homogenizing medium is silicone oil (it can also be replaced with silicone grease or conductive lubricant, which is a semi-solid design to reduce the risk of leakage). Spring-shaped conductive wires are arranged inside the connecting cable 305 to connect the push plate 303 and the homogenizing plate 304. An insulating layer is arranged on the outside of the conductive wires so that the push plate 303 and the homogenizing plate 304 maintain conductive continuity with the electromagnetic shielding of the shielding box 1). The connecting cable 305 is in a relaxed state in the compressed state. The length value in the initial state is the same as the distance value between the push plate 303 and the homogenizing plate 304.

[0043] Specifically, in the second embodiment, the method of adjusting the protrusion of the upright plate 3 is used to adapt to the thinning of the intermediate layer 203. However, in actual operation, because the length of the push plate 303 is greater than the length of the pry plate 301, even if the cross-section of the push plate 303 and the intermediate layer 203 are the same, the thinning degree of the intermediate layer 203 is not exactly the same, which limits the use of the second embodiment.

[0044] To improve the above-mentioned phenomenon, this embodiment is adopted. In this embodiment, the silicone oil is incompressible, so after filling the cavity of the homogenizing plate 304 and the pushing plate 303, the force on the homogenizing plate 304 can be effectively transmitted, making the squeezing action of the pushing plate 303 uniform. In addition, when the homogenizing plate 304 is reset, the pushing plate 303 can be driven to reset synchronously under the action of the connecting cable 305 made of non-elastic material.

[0045] Finally, conductive sealing rings are arranged on the surfaces of the push plate 303 and the homogenizing plate 304 that are close to each other. With the length design of the push plate 303 and the homogenizing plate 304, when the push plate 303 pushes and squeezes the intermediate layer 203 to the maximum value, part of the push plate 303 is still located inside the drawer plate 2, which avoids the loss of the homogenizing medium and ensures the sealing performance.

[0046] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A modular assembled electromagnetic shielding test box, comprising a shielding box (1) with a notch on one side surface, characterized in that: The bottom of the shielding box (1) is fitted with a frame, inside which a cylinder (101) is installed. A constraint slider (102) is also fitted at the bottom of the shielding box (1). A horizontal plate is slidably connected inside the constraint slider (102). A drawer plate (2) is fixedly connected to one end of the horizontal plate, and a fixture plate (4) is fixed to the surface of the drawer plate (2). Four sets of auxiliary components are installed on the surface of the shielding box (1). The auxiliary components include a vertical plate (3) located outside the notch. A movable groove (201) is opened inside the drawer plate (2), and a vertical block is fixed to the surface of the drawer plate (2). A self-rotating mechanism is rotatably mounted on the surface of the vertical block. A reset pivot (302) is installed on the surface of the self-resetting pivot (302), and a pry plate (301) is rotatably mounted on the surface of the self-resetting pivot (302). A push plate (303) is installed through the inside of the drawer plate (2), and the end of the push plate (303) is movably connected to the end of the pry plate (301) through multiple hinge balls. An intermediate layer (203) is installed on the surface of the drawer plate (2) near the shielding box (1). A leak-proof layer (202) is installed on the surface of the intermediate layer (203) away from the surface of the drawer plate (2). When the self-resetting pivot (302) is arranged horizontally, the distance between it and the surface of the shielding box (1) is less than the distance between the surface of the upright plate (3) and the surface of the shielding box (1).

2. The modular assembled electromagnetic shielding test box according to claim 1, characterized in that: The width of the active groove (201) is greater than the thickness of the pry plate (301), and the push plate (303) is the same length as the intermediate layer (203).

3. The modular assembled electromagnetic shielding test box according to claim 1, characterized in that: The leak-proof layer (202) is made of beryllium copper alloy spring sheet, the intermediate layer (203) is made of elastic material, and the surface of the drawer plate (2) is equipped with a protrusion with the same cross-sectional area as the notch. The intermediate layer (203) and the surface of the drawer plate (2) are bonded together by a conductive adhesive layer.

4. The modular assembled electromagnetic shielding test box according to claim 1, characterized in that: The inner wall of the shielding box (1) is equipped with a measuring component (5). The measuring component (5) includes two guide rods (501) installed on the inner wall of the shielding box (1). The surfaces of the two guide rods (501) are slidably connected to guide rods (502), and the surfaces of the guide rods (502) are slidably sleeved with a fixing block (503) and fixedly sleeved with a positioning block. The bottom of the fixing block (503) is connected to a robotic arm, and the surface of the robotic arm is equipped with a camera and a test antenna.

5. The modular assembled electromagnetic shielding test box according to claim 1, characterized in that: The top and one side surfaces of the frame are open, and one end of the horizontal plate is connected to the power end of the cylinder component (101).

6. The modular assembled electromagnetic shielding test box according to claim 1, characterized in that: The surface of the shielding box (1) is equipped with a feedback system, which includes a display screen installed on the surface of the shielding box (1). A thin-film pressure sensor connected to the display screen is arranged between the intermediate layer (203) and the anti-leakage layer (202).

7. A modular assembled electromagnetic shielding test box according to claim 6, characterized in that: The feedback system also includes an adjustment module, and the adjustment module includes an internal frame (6) embedded in the surface of the shielding box (1). A base block (7) is embedded in the surface of the shielding box (1). An adjustment rod (8) is threadedly connected inside the base block (7). An insertion rod (9) is connected to the end of the adjustment rod (8) through a bushing. The insertion rod (9) is connected to the upright plate (3), and the internal frame (6) is slidably inserted into the upright plate (3).

8. A modular assembled electromagnetic shielding test box according to claim 7, characterized in that: The feedback system also includes a homogenization module, which includes a homogenization plate (304) with the same cross-sectional shape as the push plate (303). The surface of the homogenization plate (304) is movably connected to the surface of the pry plate (301) by a hinge ball. The homogenization plate (304) and the push plate (303) are connected by a connecting cable (305) made of non-elastic material. The space between the homogenization plate (304) and the push plate (303) is filled with a homogenization medium.

9. A modular assembled electromagnetic shielding test box according to claim 8, characterized in that: The length values ​​of the push plate (303) and the homogenization plate (304) in the top view are both greater than the effective pushing value of the pry plate (301), and the homogenization medium is silicone oil.

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