Anti-interference circuit board with shielding structure

Abstract

The invention discloses an anti-interference circuit board with a shielding structure, and belongs to the field of circuit boards, the anti-interference circuit board with the shielding structure comprises a grounding layer, and the top of the grounding layer is provided with a signal layer; the shielding frame is mounted on the outer side of the signal layer on the top of the grounding layer and used for forming a shielding structure on the outer side of the signal layer; the shielding cover is installed on the inner side of the top end of the shielding frame and used for being combined with the shielding frame to form a complete shielding structure, and heat dissipation fins are fixed to the top of the shielding cover; the positioning pieces are installed at the end corner positions of the shielding frame and used for limiting the position of the shielding cover at the top of the shielding frame, the shielding frame can be adjusted according to the specific size through cooperation of the grounding layer, the shielding frame, the positioning pieces, the shielding cover and the heat dissipation fins, meanwhile, the heat dissipation effect of the shielding cover is improved through the heat dissipation fins, and the heat dissipation effect of the shielding cover is improved. The signal layer is shielded through the combination of the shielding frame and the positioning member, and the assembly of the shielding cover on the shielding frame is limited through the positioning member.

Description

Technical Field

[0001] This invention relates to the field of circuit boards, and more specifically, to a circuit board with an anti-interference shielded structure. Background Technology

[0002] As electronic devices evolve towards higher frequencies, higher speeds, higher densities, and miniaturization, electromagnetic interference (EMI) and radio frequency interference (RFI) issues on circuit boards are becoming increasingly prominent. Especially when high-frequency processors, RF modules, clock generators, and mixed-signal circuits are integrated on the board, the electromagnetic compatibility between these components becomes crucial in determining product performance and stability. Currently, the most common method for partial shielding of circuit boards is using a shielding can. A traditional shielding can is typically a cover plate stamped from a thin metal sheet, fixed to the grounding copper foil of the circuit board by welding or snap-fitting, forming a closed or semi-closed cavity that isolates sensitive circuits or components.

[0003] For example, patent (CN222564246U) discloses an anti-interference circuit board with a shielding structure, including a circuit board body and circuit elements; the circuit elements are provided at the top of the circuit board body, and a heat dissipation structure is provided at the middle position of the top of the circuit board body; connecting posts are provided at the corners of the top of the circuit board body, and the tops of the connecting posts are all provided with shielding structures. This utility model, by providing a shielding structure, allows the connecting posts to be placed inside the sliding groove during installation for guidance and positioning. When the snap-fit ​​plate slides inside the snap-fit ​​groove, the inclined surface of the snap-fit ​​groove causes the snap-fit ​​plate to move towards the isolation plate side. When it reaches the designated position, the top of the snap-fit ​​plate is suspended and then moved to both sides by the spring force to achieve positioning. Furthermore, the shielding layer can effectively shield and protect the circuit board, thus achieving the purpose of easy installation and effective protection of the circuit board. When using the above technology, the following technical problems were found in the existing technology: the shape and size of the existing shielding structure are determined in the design stage. Once the circuit board layout changes or a chip of a different size needs to be replaced, the original shielding cover cannot be used and must be re-molded and manufactured. At the same time, it is not convenient to open and debug. To this end, we designed an anti-interference shielded circuit board to provide another technical solution to the above technical problems. Summary of the Invention

[0004] 1. Technical problems to be solved To address the problems existing in the prior art, the purpose of this invention is to provide an anti-interference shielded circuit board. It can achieve the following: by cooperating with a ground layer, a shielding frame, a positioning component, a shielding cover, and heat dissipation fins, the shielding frame can be adjusted according to specific dimensions. At the same time, the heat dissipation fins increase the heat dissipation effect of the shielding cover. Furthermore, the combination of the shielding frame and the positioning component achieves a shielding effect on the signal layer. Meanwhile, the positioning component limits the assembly of the shielding cover on the shielding frame.

[0005] 2. Technical Solution To solve the above problems, the present invention adopts the following technical solution.

[0006] An anti-interference shielded circuit board, comprising: A grounding layer, on top of which a signal layer is provided; A shielding frame is installed on the outside of the signal layer at the top of the grounding layer to form a shielding structure on the outside of the signal layer; A shielding cover is installed on the inner side of the top of the shielding frame to form a complete shielding structure when combined with the shielding frame. A heat dissipation fin is fixed on the top of the shielding cover, and a sealing ring is provided on the outer side of the bottom of the shielding cover. Positioning components are installed at the corners of the shielding frame to limit the position of the shielding cover at the top of the shielding frame.

[0007] Furthermore, an insulating layer is sprayed on top of the grounding layer and at the bottom of the signal layer.

[0008] Furthermore, the shielding frame includes four corner plates, two first intermediate plates, and two second intermediate plates. The four corner plates are located at the four corners respectively. The two corner plates at the same end are connected by the second intermediate plates, and the two corner plates on the same side are connected by the first intermediate plates. The side of the corner plate closest to the second intermediate plate and the side of the corner plate closest to the first intermediate plate are both fixed with mounting plates. The mounting plates are slidably connected to the first intermediate plates and to the second intermediate plates.

[0009] Furthermore, a second splicing plate is fixed to the outer center of the top of the first intermediate plate, a third splicing plate is fixed to the outer center of the top of the second intermediate plate, and a first splicing plate is fixed to the outer side of the top of the corner plate. The first splicing plate and the first intermediate plate, as well as the first splicing plate and the second intermediate plate, are detachably connected. Connecting bolts are provided inside both ends of the first splicing plate, and the connecting bolts are threadedly connected to the first intermediate plate and to the second intermediate plate.

[0010] Furthermore, a limiting component for connecting the shielding frame is installed on the top of the grounding layer. The limiting component includes a first connecting block and a second connecting block. The first connecting block is fixed at the top of the grounding layer and at a position corresponding to the first intermediate plate. The first connecting block is slidably connected to the first intermediate plate. The second connecting block is fixed at the top of the grounding layer and at a position corresponding to the second intermediate plate. The second connecting block is slidably connected to the second intermediate plate. Positioning blocks are slidably connected to both ends inside the first connecting block and both sides inside the second connecting block. A compression spring is fixed between the two positioning blocks. An inclined surface is opened on the top of the positioning block away from the compression spring.

[0011] Furthermore, a connecting groove is provided inside the bottom end of both the first intermediate plate and the second intermediate plate, and a positioning groove is provided inside the first intermediate plate and the second intermediate plate at the position corresponding to the positioning block, and the connecting groove and the positioning groove are connected.

[0012] Furthermore, the positioning component includes an extrusion plate and positioning bolts. Each of the first splicing plates has a positioning bolt threaded inside its top end. The extrusion plate is detachably connected to the outside of the positioning bolt. Extrusion slopes are formed on all four sides of the bottom of the extrusion plate.

[0013] Furthermore, a brake bolt is connected to the internal thread at one end of the positioning bolt, and a brake hole is symmetrically opened inside the top of the extrusion plate at a position corresponding to the brake bolt.

[0014] A processing device for preparing a circuit board with an anti-interference shielding structure as described above.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of this invention are: (1) This solution can adjust the shielding frame according to the specific size by combining the grounding layer, shielding frame, positioning component, shielding cover and heat dissipation fins. At the same time, the heat dissipation effect of the shielding cover is increased by the heat dissipation fins. Then, the shielding effect of the signal layer is achieved by the combination of the shielding frame and positioning component. At the same time, the positioning component limits the assembly of the shielding cover on the shielding frame.

[0017] (2) By cooperating with the corner plate, the first intermediate plate and the second intermediate plate, the size of the second intermediate plate and the first intermediate plate can be changed according to the required size, so as to adapt to different sizes. At the same time, positioning can be achieved by the staggered arrangement of the first splicing plate and the second splicing plate or the third splicing plate, and the connection can be made stable by connecting bolts.

[0018] (3) By cooperating with the first connecting block, the second connecting block and the connecting groove, the shielding frame can be assembled and then connected with the first connecting block and the second connecting block to achieve the assembly effect between the shielding frame and the grounding layer.

[0019] (4) By combining the extrusion plate, positioning bolt and braking bolt, the rotation of the extrusion plate can be squeezed by the extrusion inclined surface to make the positioning part and the shielding frame firmly assembled. At the same time, it is easy to remove the positioning part to realize the debugging of the signal layer. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 For the present invention Figure 2 A bottom view; Figure 4 This is a schematic diagram of the structure of the insulating layer of the present invention; Figure 5 This is a schematic diagram of the internal structure of the connecting block of the present invention; Figure 6 This is a schematic diagram of the shielding frame of the present invention; Figure 7 This is a schematic diagram of the structure of the first splicing plate of the present invention; Figure 8 This is a schematic diagram of the structure of the intermediate plate of the present invention; Figure 9 A schematic diagram of the structure of the connecting groove for the invention; Figure 10 A schematic diagram of the structure of the brake hole for the invention. Figure 11 This is a schematic diagram of the structure of the extrusion plate for the invention.

[0021] Explanation of the labels in the diagram: 1. Grounding layer; 2. Shielding frame; 3. Positioning component; 4. Shielding cover; 5. Heat dissipation fins; 6. Sealing ring; 7. Signal layer; 8. First connecting block; 9. Second connecting block; 10. Positioning block; 11. Compression spring; 12. Inclined surface; 13. Angle plate; 14. First intermediate plate; 15. Second intermediate plate; 16. Connecting bolt; 17. First splicing plate; 18. Assembly plate; 19. Second splicing plate; 20. Third splicing plate; 21. Assembly groove; 22. Connecting groove; 23. Positioning groove; 24. Insulation layer; 25. Extrusion plate; 26. Extrusion inclined surface; 27. Positioning bolt; 28. Brake hole; 29. ​​Brake bolt. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Example 1:

[0024] Please see Figures 1-11 ,include: Grounding layer 1, with a signal layer 7 on top of grounding layer 1, is used to support the bottom of signal layer 7 through grounding layer 1, and at the same time, grounding layer 1 serves as a shielded contact bottom surface; Preferably, an insulating layer 24 is sprayed on the top of the grounding layer 1 and at the bottom of the signal layer 7. The insulating layer 24 is made of polyimide or FR-4 material.

[0025] In other embodiments, an embedded metal shielding mesh can be provided inside the insulating layer 24. The shielding mesh is formed by etching copper foil and is honeycomb or grid-like. It is electrically connected to the ground layer 1 through metallized vias to form a local shielding area.

[0026] The shielding frame 2 is installed on the outside of the signal layer 7 at the top of the grounding layer 1 to form a shielding structure on the outside of the signal layer 7. The shielding frame 2 includes four corner plates 13, two first intermediate plates 14, and two second intermediate plates 15. The four corner plates 13 are located at the four corners. The two corner plates 13 on the same end are connected by the second intermediate plates 15, and the two corner plates 13 on the same side are connected by the first intermediate plates 14, so that the four corner plates 13, the two first intermediate plates 14, and the two second intermediate plates 15 form a rectangle. The side of the corner plate 13 near the second intermediate plate 15 and the side of the corner plate 13 near the first intermediate plate 14 are both fixed with mounting plates 18. The mounting plates 18 are slidably connected to the first intermediate plates 14 and to the second intermediate plates 15, so that the assembled corner plates 13, the first intermediate plates 14, and the second intermediate plates 15 cannot be detached in a straight up-down manner. Preferably, the interior of both ends of the first intermediate plate 14 and the interior of both sides of the second intermediate plate 15 are provided with assembly grooves 21, so that the first intermediate plate 14 and the assembly plate 18, and the second intermediate plate 15 and the assembly plate 18 are connected by the assembly grooves 21.

[0027] A second splicing plate 19 is fixed to the center of the outer side of the top of the first intermediate plate 14. The top of the two first intermediate plates 14, located between the two second splicing plates 19, is a blank space. A third splicing plate 20 is fixed to the center of the outer side of the top of the second intermediate plate 15, leaving a blank space at the top of the second intermediate plate 15 and between the two third splicing plates 20. A first splicing plate 17 is fixed to the outer side of the top of the corner plate 13. The first splicing plate 17 is detachably connected to both the first intermediate plate 14 and the second intermediate plate 15, allowing the corner plate 13 to be assembled with either the first intermediate plate 14 or the second intermediate plate 15, with the first splicing plate 17 positioned on top of the first intermediate plate 14. At both ends of 9, the first splicing plate 17 is located on the top of the second intermediate plate 15 and on both sides of the second splicing plate 19. The corner plate 13 and the first splicing plate 17 are both L-shaped, and the inner side of the first splicing plate 17 leaves a blank space at the top of the corner plate 13. The interior of both ends of the first splicing plate 17 is provided with connecting bolts 16. The connecting bolts 16 are threadedly connected to the first intermediate plate 14 and to the second intermediate plate 15. Thus, the connection of the connecting bolts 16 can restrict the translational separation between the first splicing plate 17 and the first intermediate plate 14 and between the first splicing plate 17 and the second intermediate plate 15, and can form a shielding layer between the corner plate 13, the first intermediate plate 14 and the second intermediate plate 15. In other embodiments, the corner positions of the first splicing plate 17 can be made into polygons, and the lengths of the corner plate 13, the first intermediate plate 14 and the second intermediate plate 15 can be adaptively modified as needed.

[0028] A limiting assembly for connecting the shielding frame 2 is installed on the top of the grounding layer 1. The limiting assembly includes a first connecting block 8 and a second connecting block 9. The first connecting block 8 is fixed at the top of the grounding layer 1 at a position corresponding to the first intermediate plate 14. The first connecting block 8 is slidably connected to the first intermediate plate 14, allowing the first intermediate plate 14 to be assembled by lowering it from the outside of the first connecting block 8. The second connecting block 9 is fixed at the top of the grounding layer 1 at a position corresponding to the second intermediate plate 15. The second connecting block 9 is slidably connected to the second intermediate plate 15, allowing the second intermediate plate 15 to be assembled by lowering it from the outside of the second connecting block 9. Positioning blocks 10 are slidably connected to both ends inside the first connecting block 8 and both sides inside the second connecting block 9, allowing the positioning blocks 10 to... The positioning block 10 can be slid into the interior of the first connecting block 8 or the second connecting block 9. A compression spring 11 is fixed between the two positioning blocks 10. When the positioning block 10 enters the interior of the first connecting block 8 or the second connecting block 9, it drives the compression spring 11 to compress. The top of the positioning block 10 away from the compression spring 11 has an inclined surface 12. When the first intermediate plate 14 or the second intermediate plate 15 descends, the inclined surface 12 presses against the corresponding positioning block 10, so that the positioning block 10 is completely inserted into the interior of the first connecting block 8 or the second connecting block 9. When the first intermediate plate 14 or the second intermediate plate 15 is completely outside the first connecting block 8 or the second connecting block 9, the positioning block 10 is then inserted into the interior of the first intermediate plate 14 or the second intermediate plate 15 to achieve positioning after connection. Preferably, a connecting groove 22 is provided inside the bottom end of both the first intermediate plate 14 and the second intermediate plate 15, and a positioning groove 23 is provided inside the first intermediate plate 14 and the second intermediate plate 15 at the position corresponding to the positioning block 10. The connecting groove 22 and the positioning groove 23 are connected, so that after the first connecting block 8 enters the interior of the connecting groove 22 on the first intermediate plate 14 or the second connecting block 9 enters the interior of the connecting groove 22 on the second intermediate plate 15, it enters the corresponding positioning groove 23 through the positioning block 10. This makes the first connecting block 8 and the first intermediate plate 14, and the second connecting block 9 and the second intermediate plate 15, inseparable after assembly.

[0029] The shielding cover 4 is installed on the inner side of the top of the shielding frame 2 and is used to combine with the shielding frame 2 to form a complete shielding structure. The top of the shielding cover 4 is fixed with heat dissipation fins 5. The heat dissipation fins 5 are made of aluminum or copper, which can increase the heat dissipation effect when the heat dissipation fins 5 come into contact with the outside air, and thus increase the heat dissipation of the shielding cover 4 through the heat dissipation fins 5. The bottom outer side of the shielding cover 4 is provided with a sealing ring 6. Specifically, the sealing ring 6 is a conductive rubber sealing ring, which is used to realize the dual functions of electromagnetic sealing and dust prevention between the shielding frame 2 and the shielding cover 4 through the sealing ring 6. In other embodiments, an elastic conductive spring can also be provided on the inner side of the shielding frame 2 to form a reliable electrical connection when in contact with the shielding cover 4, ensuring the continuity of shielding.

[0030] Positioning component 3 is installed at the end corner of the shielding frame 2 to limit the position of the shielding cover 4 at the top of the shielding frame 2; The positioning component 3 includes a pressing plate 25 and positioning bolts 27. Each first splicing plate 17 has a positioning bolt 27 threadedly connected to its internal top end, allowing the positioning bolts 27 to be installed at the corner positions of the top of the first splicing plate 17. This results in four positioning bolts 27 located at the four corner positions of the top of the first splicing plate 17, and their threaded connection to the first splicing plate 17 allows the positioning bolts 27 to be adjusted in height at the top of the first splicing plate 17 when rotated. The pressing plate 25 is detachably connected to the outside of the positioning bolts 27, allowing the pressing plate 25 to be positioned at the top of the first splicing plate 17. The positioning bolt 27 is rotated and adjusted around the center. When the four pressing plates 25 are adjusted to the top position of the shielding cover 4, they can press the shielding cover 4 on the top of the shielding frame 2. When the four pressing plates 25 are adjusted to the top position of the shielding cover 4, the shielding cover 4 can be separated from the shielding frame 2. The four sides of the bottom of the pressing plate 25 are provided with pressing slopes 26, so that when the pressing plate 25 rotates around the positioning bolt 27, the pressing slopes 26 can press the shielding cover 4 at the top of the shielding frame 2 by tilting, so that the shielding cover 4 drops at the top of the shielding frame 2. A brake bolt 29 is connected to the internal thread at one end of the positioning bolt 27, allowing the brake bolt 29 to be adjusted in height by the threaded connection with the positioning bolt 27 during rotation. Brake holes 28 are symmetrically opened inside the top of the extrusion plate 25 at positions corresponding to the brake bolt 29, so that the extrusion plate 25 can press the shielding cover 4 after rotating 180 degrees around the positioning bolt 27. At this time, the brake bolt 29 enters one of the brake holes 28 for braking. When the extrusion plate 25 rotates 180 degrees around the positioning bolt 27 again, it can stop contacting the shielding cover 4. At this time, the brake bolt 29 enters the other brake hole 28 for braking.

[0031] In use: Depending on the length and width of signal layer 7, the first intermediate plate 14 and the second intermediate plate 15 are replaced. The second intermediate plate 15 is assembled between the two end corner plates 13 using corresponding mounting plates 18. The first intermediate plate 14 is assembled between the two side corner plates 13 using corresponding mounting plates 18. The first splicing plate 17 at the top of the corner plate 13 is positioned on top of the first intermediate plate 14 and the second intermediate plate 15. The first splicing plate 17 is then connected to the first intermediate plate 14 or the second intermediate plate 15 using connecting bolts 16. This forms a shielding frame 2 between the corner plates 13, the first intermediate plate 14, and the second intermediate plate 15. The shielding frame 2 is then installed on top of the grounding layer 1. The first intermediate plate 14 and the second intermediate plate 15 are lowered, positioned outside the first connecting block 8 and the second connecting block 9, respectively. As the first intermediate plate 14 and the second intermediate plate 15 lower, the inclined surface 12 presses against the positioning block 10, causing the positioning block... After the positioning block 10 enters the interior of the first connecting block 8 or the second connecting block 9, it compresses the compression spring 11. When the positioning block 10 corresponds to the position of the positioning groove 23, the positioning block 10 rebounds due to the compression of the compression spring 11, allowing the positioning block 10 to enter the corresponding positioning groove 23. At this time, the first intermediate plate 14 and the first connecting block 8, and the second intermediate plate 15 and the second connecting block 9 are inseparable. Then, the shielding cover 4 is installed on the inner side of the top of the shielding frame 2, and the heat dissipation effect is increased by the heat dissipation fins 5. Then, the extrusion plate 25 is rotated so that the extrusion plate 25 rotates around the positioning bolt 27 as the center, allowing the extrusion plate 25 to press the top of the shielding cover 4 through the extrusion slope 26 at the bottom, so that the shielding cover 4 is installed firmly inside the shielding frame 2. Then, the positioning bolt 27 is rotated so that the positioning bolt 27 descends to press the position of the extrusion slope 26. At the same time, the brake bolt 29 is rotated so that the brake bolt 29 enters the corresponding brake hole 28 to restrict the rotation of the positioning bolt 27.

[0032] Example 2:

[0033] The present invention is based on the above embodiment one, and differs from embodiment one in that: A wave-absorbing material layer is coated on the bottom of the shielding cover 4. The wave-absorbing material layer is a ferrite coating or conductive foam, which can absorb high-frequency radiation and further improve the anti-interference capability.

[0034] The inner side of the shielding frame 2 is also coated with a wave-absorbing material layer, which is a ferrite coating or conductive foam, thereby absorbing high-frequency radiation and further improving the anti-interference capability. At the same time, it can dissipate the heat generated by the signal layer 7 through the heat dissipation fins 5.

[0035] Example 3:

[0036] The present invention is based on the above embodiment one, and differs from embodiment one in that: Multiple metallized grounding via arrays can be set at the edge of signal layer 7 to form a "Faraday cage" effect and prevent edge electromagnetic leakage.

[0037] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A circuit board with an anti-interference shielded structure, characterized in that: include: Grounding layer (1), and a signal layer (7) is provided on top of the grounding layer (1); The shielding frame (2) is installed on the outside of the signal layer (7) on top of the grounding layer (1) to form a shielding structure on the outside of the signal layer (7); The shielding cover (4) is installed on the inner side of the top of the shielding frame (2) to form a complete shielding structure with the shielding frame (2). The top of the shielding cover (4) is fixed with heat dissipation fins (5), and the outer side of the bottom of the shielding cover (4) is provided with a sealing ring (6). Positioning element (3) is installed at the corner of the shielding frame (2) to limit the position of the shielding cover (4) at the top of the shielding frame (2).

2. The circuit board with an anti-interference shielding structure according to claim 1, characterized in that: An insulating layer (24) is sprayed on top of the grounding layer (1) and at the bottom of the signal layer (7).

3. The circuit board with an anti-interference shielded structure according to claim 1, characterized in that: The shielding frame (2) includes four corner plates (13), two first intermediate plates (14) and two second intermediate plates (15). The four corner plates (13) are located at the four corners respectively. The two corner plates (13) at the same end are connected by the second intermediate plates (15), and the two corner plates (13) on the same side are connected by the first intermediate plates (14). The side of the corner plate (13) near the second intermediate plate (15) and the side of the corner plate (13) near the first intermediate plate (14) are both fixed with mounting plates (18). The mounting plates (18) are slidably connected to the first intermediate plates (14) and to the second intermediate plates (15).

4. The circuit board with an anti-interference shielded structure according to claim 3, characterized in that: A second splicing plate (19) is fixed to the outer center of the top of the first intermediate plate (14), a third splicing plate (20) is fixed to the outer center of the top of the second intermediate plate (15), and a first splicing plate (17) is fixed to the outer side of the top of the corner plate (13). The first splicing plate (17) and the first intermediate plate (14) and the first splicing plate (17) and the second intermediate plate (15) are detachably connected. The first splicing plate (17) is provided with connecting bolts (16) inside both ends. The connecting bolts (16) and the first intermediate plate (14) and the connecting bolts (16) and the second intermediate plate (15) are threadedly connected.

5. The circuit board with an anti-interference shielding structure according to claim 3, characterized in that: The top of the grounding layer (1) is equipped with a limiting component for connecting the shielding frame (2). The limiting component includes a first connecting block (8) and a second connecting block (9). The first connecting block (8) is fixed at the top of the grounding layer (1) and at the position corresponding to the first intermediate plate (14). The first connecting block (8) is slidably connected to the first intermediate plate (14). The second connecting block (9) is fixed at the top of the grounding layer (1) and at the position corresponding to the second intermediate plate (15). The second connecting block (9) is slidably connected to the second intermediate plate (15). Positioning blocks (10) are slidably connected to both ends inside the first connecting block (8) and both sides inside the second connecting block (9). A compression spring (11) is fixed between the two positioning blocks (10). An inclined surface (12) is opened on the top of the positioning block (10) away from the compression spring (11).

6. The circuit board with an anti-interference shielded structure according to claim 5, characterized in that: The bottom ends of the first intermediate plate (14) and the second intermediate plate (15) are provided with connecting grooves (22), and the interiors of the first intermediate plate (14) and the second intermediate plate (15) are provided with positioning grooves (23) at positions corresponding to the positioning block (10), and the connecting grooves (22) and the positioning grooves (23) are connected.

7. The circuit board with anti-interference shielding structure according to claim 4, characterized in that: The positioning component (3) includes an extrusion plate (25) and a positioning bolt (27). The top of each of the first splicing plates (17) is threaded with a positioning bolt (27). The outer side of the positioning bolt (27) is detachably connected to the extrusion plate (25). The four sides of the bottom of the extrusion plate (25) are provided with extrusion slopes (26).

8. The circuit board with anti-interference shielding structure according to claim 7, characterized in that: The positioning bolt (27) has an internal threaded connection to a brake bolt (29) at one end. A brake hole (28) is provided inside the top of the extrusion plate (25) at a position symmetrical to the brake bolt (29).

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