An anti-jamming fixture for electromagnetic compatibility testing

Abstract

This utility model discloses an anti-interference fixture for electromagnetic compatibility testing, comprising a base plate, two guide blocks fixed to the upper part of the base plate, a slider slidably disposed on the inner wall of the guide blocks, a movable plate fixed to the upper part of the slider, an L-shaped block fixed to the upper part of the movable plate, two cylinders fixed to the upper part of the base plate, a fixing block fixed to the lower part of the movable plate, a control mechanism disposed on the upper part of the base plate, a shielding plate disposed between the two movable plates, a PCB board placed on the upper part of the shielding plate, a stop block fixed to the upper part of the shielding plate, cylindrical slots evenly distributed on the upper part of the shielding plate, a limiting mechanism inserted into the inner wall of the cylindrical slots to limit the movement of the PCB board, protrusions fixed to both sides of the shielding plate, a shielding mechanism placed simultaneously on the upper parts of the two movable plates, and an anti-interference mechanism mounted on the shielding mechanism. This utility model has the advantages of accurate positioning, stable clamping, and excellent electromagnetic shielding performance.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic compatibility testing technology, specifically to an anti-interference fixture for electromagnetic compatibility testing. Background Technology

[0002] In the design and certification process of electronic devices, electromagnetic compatibility testing is a key step to ensure that the device can work normally in a complex electromagnetic environment without generating excessive electromagnetic interference. During testing, the device under test, such as a printed circuit board, needs to be securely mounted on the test platform and a reliable connection between it and the test system needs to be established.

[0003] In the existing technology, there are many types of fixtures used to fix printed circuit boards and other devices under test. Some conventional test fixtures usually adopt simple mechanical clamping structures, such as direct fixation by screws or clips. However, the positioning stability of such fixtures is limited in application. When clamping, especially when repeatedly clamping devices under test of different sizes, the lack of effective guidance and positioning reference can easily cause structural displacement of the device under test. This slight positional change can significantly affect the accuracy of the relative position between the antenna and the device under test, thus introducing test errors. Secondly, conventional fixtures often lack anti-interference design. During the test, external electromagnetic waves in the environment and electromagnetic radiation generated by the device under test itself can interfere with each other. Ordinary metal fixtures themselves may also become reflection or conduction paths for interference signals. Although some improved fixtures are equipped with local shielding plates, such shielding is often open or incomplete, and cannot form a closed electromagnetic isolation space. As a result, the test results cannot truly reflect the electromagnetic compatibility performance of the device under test itself. This problem is particularly prominent when conducting high-sensitivity, high-frequency tests.

[0004] Therefore, there is an urgent need for a new type of electromagnetic compatibility test fixture that can achieve rapid and accurate positioning and stable clamping of printed circuit boards, and can effectively shield internal and external electromagnetic interference through a shielding structure, thereby ensuring the accuracy and reliability of test data. Utility Model Content

[0005] The purpose of this invention is to provide an anti-interference fixture for electromagnetic compatibility testing, which has the advantages of accurate positioning, stable clamping and excellent electromagnetic shielding performance, thus solving the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An anti-interference fixture for electromagnetic compatibility testing includes a base plate, two guide blocks fixed to the upper part of the base plate, a slider slidably disposed on the inner wall of the guide blocks, a movable plate fixed to the upper part of the slider, an L-shaped block fixed to the upper part of the movable plate, two cylinders fixed to the upper part of the base plate, a fixing block fixed to the lower part of the movable plate, a control mechanism disposed on the upper part of the base plate, a shielding plate disposed between the two movable plates, a PCB board placed on the upper part of the shielding plate, a stop block fixed to the upper part of the shielding plate, cylindrical slots evenly distributed on the upper part of the shielding plate, a limiting mechanism inserted into the inner wall of the cylindrical slots to limit the movement of the PCB board, protrusions fixed to both sides of the shielding plate, a shielding mechanism placed on the upper part of the two movable plates, and an anti-interference mechanism mounted on the shielding mechanism. The upper end of the base plate is provided with a first groove, and a power supply mechanism is provided on the inner wall of the first groove. The power supply mechanism is electrically connected to the PCB board through an anti-interference mechanism. The output shafts of the two cylinders are respectively fixed to the ends of the two fixed blocks that are far apart from each other. The moving plate has a U-shaped structure, with the side wall of the protrusion and the inner wall of the recess of the moving plate fitting together. The ends of the stop block and the PCB board that are close to each other fit together.

[0007] Preferably, the control mechanism includes a vertical block fixed to the upper part of the base plate, a support plate fixed to the upper part of the side wall of the vertical block, and a controller placed on the upper part of the support plate.

[0008] It is worth noting that the control mechanism provides a robust support platform through the stable combination of the stand and the support plate, which ensures that the controller is protected from vibration and external interference during electromagnetic compatibility testing. It also enables precise control of the cylinder, thereby adjusting the position of the moving plate and facilitating the rapid installation and fixation of the PCB board.

[0009] Preferably, the shielding mechanism includes a shielding frame placed on the upper part of both movable plates and a shielding cover plate placed on the upper part of the shielding frame. The shielding cover plate has a T-shaped cross section, and the lower part of the side wall of the shielding cover plate is attached to the inner wall of the shielding frame. The height of the shielding frame is higher than the height of the L-shaped block.

[0010] It is worth noting that the shielding mechanism uses a combination of a shielding frame and a shielding cover to form a complete electromagnetic shielding structure, effectively isolating the PCB board from external electromagnetic interference. The T-shaped shielding cover ensures a tight fit with the shielding frame, reducing signal leakage caused by gaps. The design of the shielding frame being higher than the L-shaped block avoids structural interference and allows for unobstructed operation, thus achieving an efficient electromagnetic compatibility testing environment.

[0011] Preferably, the anti-interference mechanism includes a third shielding shell that is fixed to the side wall of the shielding frame and a power supply that is opened on the upper part of the base plate. The power supply is L-shaped, with one end of the power supply communicating with the first slot, and the lower side wall of the third shielding shell being attached to the upper part of the inner wall of the power supply.

[0012] It is worth noting that the anti-interference mechanism provides a shielded power supply through the integration of the third shielding shell and the L-shaped power supply, which effectively reduces the intrusion of electromagnetic interference during transmission and ensures that the PCB board receives stable power support. The tight fit between the third shielding shell and the inner wall of the power supply forms a continuous shielding path, reducing the risk of signal contamination.

[0013] Preferably, the power supply mechanism includes an L-shaped groove fixed to the inner wall of the power supply near the first groove, a first shielding shell fixed to the side wall of the L-shaped groove, and a second shielding shell fixed to the side wall of the first shielding shell. The L-shaped groove and the first shielding shell are internally interconnected, and the second shielding shell is electrically connected to the PCB board in sequence through the first shielding shell, the L-shaped groove, the power supply, and the third shielding shell.

[0014] It is worth noting that the power supply mechanism adopts a multi-layer shielding structure, including an L-shaped groove, a first shielding shell, and a second shielding shell, which together form an efficient electromagnetic protection network to ensure that the power transmission path from the source to the PCB board is free from interference. The internal interconnection design ensures the continuity of electrical connections, while the multi-layer shielding can effectively attenuate conducted and radiated interference.

[0015] Preferably, the lower part of one end of the two L-shaped blocks that are close to each other is attached to both sides of the PCB board, and the upper end of the PCB board is attached to the lower end of the upper half of the L-shaped blocks.

[0016] It is worth noting that the tight fit design between the L-shaped block and the PCB board achieves multi-point contact fixation, ensuring the mechanical stability of the PCB board during testing and preventing measurement errors caused by vibration or displacement. This structure enhances overall support and reduces the risk of PCB board wobbling through the fit between the top, bottom, and sides.

[0017] Preferably, the limiting mechanism includes a first limiting post inserted into the inner wall of a plurality of cylindrical grooves and a first limiting block fixed to the upper end of the plurality of first limiting posts, wherein the ends of the first limiting block and the PCB board that are close to each other are in contact with each other.

[0018] It is worth noting that this limiting mechanism, through a simple combination of a first limiting post and a first limiting block, provides reliable positional constraint for the PCB board, ensuring it maintains a fixed posture during testing and preventing lateral movement. This design is simple in structure, reduces manufacturing costs, and facilitates quick installation and adjustment.

[0019] Preferably, the limiting mechanism includes a second limiting post inserted into the inner wall of a plurality of cylindrical grooves, a second limiting block fixed to the upper end of the plurality of second limiting posts, at least two springs fixed to the end of the second limiting block facing the PCB board, and a third limiting block fixed to the end of the at least two springs facing the PCB board, wherein the ends of the third limiting block and the PCB board that are close to each other are in contact with each other.

[0020] It is worth noting that the second embodiment of the limiting mechanism achieves adaptive limiting through the elastic design of the spring and the third limiting block. It can flexibly adapt to PCB boards of different thicknesses or sizes, ensuring a tight fit without causing damage. The spring can provide a buffering effect, reducing impact and vibration during testing, protecting the PCB board and improving measurement accuracy.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model achieves rapid and accurate positioning and multi-directional clamping of PCB boards by setting a movable plate driven by a cylinder and sliding along a guide block, and an L-shaped block fixed on it, in conjunction with the stop block on the shielding plate. In use, the cylinder pushes the movable plate to move in opposite directions, so that the L-shaped block presses the PCB board from above and the side at the same time, and together with the stop block and the limiting mechanism, it forms a stable limiting system, which effectively prevents any displacement and shaking of the PCB board during the test, solves the problem of test error caused by unstable positioning of conventional fixtures, and ensures the repeatability and accuracy of the test. 2. This utility model achieves efficient electromagnetic isolation of the test area by setting up a complete shielding structure consisting of a shielding frame, a shielding cover, and an anti-interference mechanism. The shielding frame works in conjunction with the moving plate for support, and the T-shaped shielding cover tightly engages with it, forming a closed shielding space that effectively isolates the PCB board from ambient electromagnetic waves. At the same time, the anti-interference mechanism and power supply mechanism adopt a multi-layer shielding shell design, ensuring the purity of the power signal in the transmission path, significantly reducing internal and external electromagnetic crosstalk, solving the test inaccuracy problem caused by incomplete open shielding, and providing a reliable environment for high-sensitivity testing. 3. This utility model enhances the versatility and adaptability of the fixture by setting a limiting mechanism containing elastic elements. The limiting mechanism pushes the third limiting block with a spring, which can adaptively press the edge of PCB boards of different thicknesses or sizes. While providing reliable limiting, it avoids device damage that may be caused by hard contact. This elastic buffer design not only simplifies the clamping operation and improves efficiency, but also further enhances the installation stability of the PCB board under complex test conditions, thereby ensuring the reliability of the test results. Attached Figure Description

[0022] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model; Figure 2 The diagram shown is a three-dimensional structural schematic of the movable plate of this utility model; Figure 3 The diagram shown is a three-dimensional structural schematic of the shielding plate of this utility model. Figure 4 The diagram shown is a three-dimensional structural schematic of the first embodiment of the limiting mechanism of this utility model; Figure 5The diagram shown is a three-dimensional structural schematic of the second embodiment of the limiting mechanism of this utility model; Figure 6 The diagram shown is a three-dimensional cross-sectional view of the shielding mechanism of this utility model. Figure 7 The diagram shown is a three-dimensional structural schematic of the power supply mechanism of this utility model. Figure 8 The diagram shown is a three-dimensional cross-sectional view of the third shielding shell of this utility model.

[0023] Reference numerals: 1. Base plate; 2. Guide block; 3. Moving plate; 31. Fixed block; 4. Slider; 5. L-shaped block; 6. Cylinder; 7. Shielding plate; 71. Protrusion; 72. Stop block; 73. Cylindrical groove; 731. First limiting block; 732. First limiting post; 733. Second limiting block; 734. Second limiting post; 735. Spring; 736. Third limiting block; 8. Vertical block; 9. Bearing plate; 10. Controller; 11. PCB board; 12. Shielding frame; 13. Shielding cover plate; 14. First groove; 15. L-shaped groove; 16. First shielding shell; 17. Second shielding shell; 18. Power supply; 19. Third shielding shell. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] To address the limitations of existing technologies, such as the limited positioning accuracy of conventional fixtures leading to testing errors, and the lack of comprehensive electromagnetic shielding design causing test results to be affected by internal and external electromagnetic interference, the following technical solutions are proposed. Please refer to [link / reference]. Figures 1-8 ; An anti-interference fixture for electromagnetic compatibility testing includes a base plate 1, two guide blocks 2 fixed to the upper end of the base plate 1, a slider 4 slidably disposed on the inner wall of the guide block 2, a movable plate 3 fixed to the upper end of the slider 4, an L-shaped block 5 fixed to the upper end of the movable plate 3, two cylinders 6 fixed to the upper end of the base plate 1, a fixing block 31 fixed to the lower end of the movable plate 3, a control mechanism disposed on the upper end of the base plate 1, a shielding plate 7 disposed between the two movable plates 3, a PCB board 11 placed on the upper end of the shielding plate 7, a stop block 72 fixed to the upper end of the shielding plate 7, cylindrical grooves 73 evenly distributed on the upper end of the shielding plate 7, a limiting mechanism inserted into the inner wall of the cylindrical grooves 73 to limit the movement of the PCB board 11, protrusions 71 fixed to both sides of the shielding plate 7, a shielding mechanism placed on the upper ends of the two movable plates 3, and an anti-interference mechanism mounted on the shielding mechanism. A first groove 14 is provided at the upper end of the base plate 1. A power supply mechanism is provided on the inner wall of the first groove 14. The power supply mechanism is electrically connected to the PCB board 11 through an anti-interference mechanism. The output shafts of the two cylinders 6 are respectively fixed to the ends of the two fixed blocks 31 that are far apart from each other. The moving plate 3 has a U-shaped structure. The side wall of the protrusion 71 and the inner wall of the recess of the moving plate 3 are in contact with each other. The end of the stop block 72 and the PCB board 11 that are close to each other are in contact with each other.

[0026] In use, the cylinder 6 is activated to move the fixed block 31, which in turn moves the movable plate 3. The PCB board 11 is then placed on the upper end of the two movable plates 3. The cylinder 6 is then activated to bring the two movable plates 3 closer together, thus pressing and fixing the PCB board 11 between the two L-shaped blocks 5. The shielding mechanism is then placed on the upper end of the two movable plates 3 to shield the PCB board 11. The power supply mechanism is electrically connected to the PCB board 11 through the anti-interference mechanism to power the PCB board 11. By deploying a spectrum analyzer at a suitable external location, the electromagnetic interference conducted outward from the circuit board can be analyzed.

[0027] In this embodiment, the control mechanism specifically includes a vertical block 8 fixed to the upper end of the base plate 1, a support plate 9 fixed to the upper part of the side wall of the vertical block 8, and a controller 10 placed on the upper end of the support plate 9.

[0028] In this embodiment, specifically: the shielding mechanism includes a shielding frame 12 placed on the upper end of the two movable plates 3 and a shielding cover plate 13 placed on the upper end of the shielding frame 12. The shielding cover plate 13 has a T-shaped cross section. The lower part of the side wall of the shielding cover plate 13 is attached to the inner wall of the shielding frame 12. The height of the shielding frame 12 is higher than the height of the L-shaped block 5.

[0029] In this embodiment, specifically: the anti-interference mechanism includes a third shielding shell 19 that is fixed to the side wall of the shielding frame 12 and a power supply 18 that is opened at the upper end of the base plate 1. The power supply 18 is L-shaped, and one end of the power supply 18 is connected to the first groove 14. The lower side wall of the third shielding shell 19 is attached to the upper part of the inner wall of the power supply 18.

[0030] In this embodiment, specifically: the power supply mechanism includes an L-shaped groove 15 fixed to the inner wall of the power supply 18 near the first groove 14, a first shielding shell 16 fixed to the side wall of the L-shaped groove 15, and a second shielding shell 17 fixed to the side wall of the first shielding shell 16. The L-shaped groove 15 and the first shielding shell 16 are interconnected. The second shielding shell 17 is electrically connected to the PCB board 11 in sequence through the first shielding shell 16, the L-shaped groove 15, the power supply 18, and the third shielding shell 19.

[0031] In this embodiment, specifically: the lower part of one end of the two L-shaped blocks 5 that are close to each other is attached to both sides of the PCB board 11, and the upper end of the PCB board 11 is attached to the lower end of the upper half of the L-shaped blocks 5.

[0032] Example 1: In this example, the limiting mechanism specifically includes a first limiting post 732 inserted into the inner wall of multiple cylindrical slots 73 and a first limiting block 731 fixed to the upper end of the multiple first limiting posts 732. The first limiting block 731 and the PCB board 11 are close to each other and fit together. The cylindrical slots 73 provide a stable installation base for the first limiting posts 732. The first limiting posts 732 provide a firm support for the first limiting block 731. The close fit between the first limiting block 731 and the PCB board 11 can accurately limit the lateral displacement of the PCB board 11, avoiding positional deviation of the PCB board 11 during testing and affecting the test accuracy. The overall structure is simple and easy to operate. The limiting and fixing of the PCB board 11 can be completed without complicated debugging, which can improve the clamping efficiency of the PCB board 11 and meet the needs of rapid positioning of the PCB board 11 in electromagnetic compatibility testing.

[0033] Example 2: In this example, specifically: the limiting mechanism includes second limiting posts 734 inserted into the inner wall of multiple cylindrical grooves 73, second limiting blocks 733 fixed to the upper ends of the multiple second limiting posts 734, at least two springs 735 fixed to the end of the second limiting blocks 733 facing the PCB board 11, and a third limiting block 736 fixed to the end of the at least two springs 735 facing the PCB board 11. The third limiting block 736 and the end of the PCB board 11 that are close to each other are in contact with each other. The cylindrical grooves 73 provide a stable assembly reference for the second limiting posts 734. The positioning post 734 provides a stable support for the second limiting block 733, which in turn provides a reliable mounting carrier for the spring 735. The spring 735 can flexibly extend and retract to drive the third limiting block 736 to adapt to different sizes of PCB boards 11. This not only ensures the positioning stability of the PCB board 11 through the third limiting block 736, but also avoids the limiting structure from causing squeezing damage to the PCB board 11 with the buffering effect of the spring 735. This solves the positioning offset problem when repeatedly clamping PCB boards 11 of different sizes, and greatly improves the adaptability of the fixture to various specifications of PCB boards 11.

[0034] Working principle: The operator first starts the two cylinders 6 through the controller 10. The output shaft of the cylinder 6 retracts and drives the fixed block 31 fixed to it to move outward. The fixed block 31 then drives the moving plate 3 to slide outward along the slider 4 in the guide block 2, so that the two moving plates 3 move away from each other. The PCB board 11 to be tested is then placed on the shielding plate 7, so that one side of it is in contact with the stop block 72. If the limiting mechanism in Embodiment 1 is used, the first limiting block 731 fixed to its top is tightly attached to the edge of the PCB board 11 by inserting multiple first limiting posts 732 into the corresponding cylindrical grooves 73, thereby achieving the initial rigid lateral limiting of the PCB board 11. If the limiting mechanism in Embodiment 2 is used, the second limiting block 734 is inserted into the corresponding cylindrical groove 73, and the second limiting block 733 fixed to its top pushes the third limiting block 736 to adaptively press the edge of the PCB board 11 through the spring 735 at its end, thereby achieving preliminary elastic lateral limiting. Then, control the cylinder 6 again so that its output shaft pushes the fixed block 31 and the moving plate 3 to move towards each other. The L-shaped block 5 at the top of the moving plate 3 then approaches and finally fits tightly against the PCB board 11 from the top and side at the same time, thus firmly clamping it between the two L-shaped blocks 5 and the stop block 72. Next, place the shielding frame 12 on the top of the two movable plates 3 so that it completely covers the PCB board 11. Then, fasten the shielding cover plate 13 onto the shielding frame 12. Its T-shaped cross-section structure fits tightly with the inner wall of the shielding frame 12 to form a complete electromagnetic shielding space. At this time, the lower end of the third shielding shell 19 in the anti-interference mechanism installed on the shielding frame 12 is attached to the upper part of the inner wall of the L-shaped power supply 18 at the upper end of the base plate 1. The power wires provided by the second shielding shell 17 in the power supply mechanism are transmitted to the PCB board 11 to supply power through the first shielding shell 16, L-shaped groove 15, power supply 18 and third shielding shell 19 in sequence. Throughout the testing process, the shielding system, consisting of the shielding frame 12, the shielding cover 13, the anti-interference mechanism, and the power supply mechanism, effectively isolates internal and external electromagnetic interference, thereby ensuring that the spectrum analyzer can accurately analyze the electromagnetic interference conducted outward from the PCB board 11 through the power lines and signal lines at external locations.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. An anti-interference fixture for electromagnetic compatibility testing, characterized in that: It includes a base plate (1), two guide blocks (2) fixed to the upper end of the base plate (1), a slider (4) slidably disposed on the inner wall of the guide block (2), a moving plate (3) fixed to the upper end of the slider (4), an L-shaped block (5) fixed to the upper end of the moving plate (3), two cylinders (6) fixed to the upper end of the base plate (1), a fixing block (31) fixed to the lower end of the moving plate (3), a control mechanism disposed on the upper end of the base plate (1), and a mechanism disposed between the two moving plates (3). The shielding plate (7), the PCB board (11) placed on the upper end of the shielding plate (7), the stop block (72) fixed to the upper end of the shielding plate (7), the columnar grooves (73) evenly distributed on the upper end of the shielding plate (7), the limiting mechanism inserted into the inner wall of the columnar groove (73) to limit the PCB board (11), the protrusions (71) fixed to both sides of the shielding plate (7), the shielding mechanism placed on the upper end of the two movable plates (3) at the same time, and the anti-interference mechanism installed on the shielding mechanism; The upper end of the base plate (1) is provided with a first groove (14), and the inner wall of the first groove (14) is provided with a power supply mechanism. The power supply mechanism is electrically connected to the PCB board (11) through an anti-interference mechanism. The output shafts of the two cylinders (6) are respectively fixed to the ends of the two fixed blocks (31) that are far apart from each other. The moving plate (3) has a U-shaped structure. The side wall of the protrusion (71) and the inner wall of the recess of the moving plate (3) are attached together. The end of the stop block (72) and the PCB board (11) that are close to each other are attached together.

2. The anti-interference fixture for electromagnetic compatibility testing according to claim 1, characterized in that: The control mechanism includes a vertical block (8) fixed to the upper end of the base plate (1), a support plate (9) fixed to the upper part of the side wall of the vertical block (8), and a controller (10) placed on the upper end of the support plate (9).

3. The anti-interference fixture for electromagnetic compatibility testing according to claim 1, characterized in that: The shielding mechanism includes a shielding frame (12) placed on the upper end of two movable plates (3) and a shielding cover plate (13) placed on the upper end of the shielding frame (12). The shielding cover plate (13) has a T-shaped cross section. The lower part of the side wall of the shielding cover plate (13) is attached to the inner wall of the shielding frame (12). The height of the shielding frame (12) is higher than the height of the L-shaped block (5).

4. The anti-interference fixture for electromagnetic compatibility testing according to claim 3, characterized in that: The anti-interference mechanism includes a third shielding shell (19) that is fixed to the side wall of the shielding frame (12) and a power supply (18) that is opened on the upper end of the base plate (1). The power supply (18) is L-shaped, and one end of the power supply (18) is connected to the first slot (14). The lower side wall of the third shielding shell (19) is attached to the upper part of the inner wall of the power supply (18).

5. The anti-interference fixture for electromagnetic compatibility testing according to claim 4, characterized in that: The power supply mechanism includes an L-shaped groove (15) fixed to the inner wall of the power supply (18) near the first groove (14), a first shielding shell (16) fixed to the side wall of the L-shaped groove (15), and a second shielding shell (17) fixed to the side wall of the first shielding shell (16). The L-shaped groove (15) and the first shielding shell (16) are interconnected. The second shielding shell (17) is electrically connected to the PCB board (11) in sequence through the first shielding shell (16), the L-shaped groove (15), the power supply (18), and the third shielding shell (19).

6. The anti-interference fixture for electromagnetic compatibility testing according to claim 1, characterized in that: The lower part of one end of the two L-shaped blocks (5) that are close to each other is attached to the two sides of the PCB board (11), and the upper end of the PCB board (11) is attached to the lower end of the upper half of the L-shaped blocks (5).

7. The anti-interference fixture for electromagnetic compatibility testing according to claim 1, characterized in that: The limiting mechanism includes a first limiting post (732) inserted into the inner wall of multiple cylindrical grooves (73) and a first limiting block (731) fixed to the upper end of the multiple first limiting posts (732). The first limiting block (731) and the PCB board (11) are close to each other and fit together.

8. The anti-interference fixture for electromagnetic compatibility testing according to claim 1, characterized in that: The limiting mechanism includes a second limiting post (734) inserted into the inner wall of a plurality of cylindrical slots (73), a second limiting block (733) fixed to the upper end of the plurality of second limiting posts (734), at least two springs (735) fixed to the end of the second limiting block (733) facing the PCB board (11), and a third limiting block (736) fixed to the end of the at least two springs (735) facing the PCB board (11). The third limiting block (736) and the end of the PCB board (11) that are close to each other are in contact with each other.

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