A production method of a stepped PCB board and a PCB board adapted thereto

Abstract

The application belongs to the technical field of PCB board, and particularly relates to a production method of a stepped PCB board and a matched PCB board, which comprises a stepped PCB female board, a stepped PCB male board, a golden finger connecting plate and a locking module. Through the structural design of the locking module, after the stepped PCB female board is connected with the stepped PCB male board, the stepped PCB female board is preliminarily limited through the clamping strip and the elastic strip. When the stepped PCB female board is installed, the clamping strip is limited through the first screw, and then the stepped PCB male board is fixed, so that the stability between the stepped PCB female board and the stepped PCB male board is improved. Through the structural design of the extension piece, when the component is welded on the stepped PCB female board or the stepped PCB male board, if the size of the component is too large and the component needs to be protected, the extension piece is installed on the reserved through hole. If the height of the added elastic extension rod does not exceed the height of the component, a new elastic extension rod can be added again to protect the component which is too high, so that the safety of the component is ensured and damage is avoided.

Description

Technical Field

[0001] This invention belongs to the field of PCB board technology, specifically relating to a method for producing a stepped PCB board and a compatible PCB board. Background Technology

[0002] PCB, or Printed Circuit Board, is an important electronic component. It serves as the support for electronic components and the carrier for their electrical interconnections. Because it is manufactured using electronic printing techniques, it is called a "printed" circuit board.

[0003] There is currently no clear definition in the industry for stepped printed circuit boards (PCBs). A common definition is that during the PCB manufacturing process, local areas of the PCB are formed with varying heights (grooves or steps) through lamination, milling, or other methods. However, traditional stepped PCB designs employ either an integrated or separate design. Integrated designs result in low PCB material utilization and high costs, while separate designs are prone to unstable electrical performance. Summary of the Invention

[0004] The purpose of this invention is to provide a method for producing a stepped PCB board and a compatible PCB board, which can effectively fix and connect a stepped PCB board with a split design, improve the stability of the connection, and at the same time, protect the slots from oxidation before splicing, prevent oxidation of the contacts inside the slots, and ensure the stability of electrical performance.

[0005] The specific technical solution adopted by this invention is as follows:

[0006] A stepped PCB board, comprising:

[0007] A stepped PCB motherboard, wherein multiple slots are provided on the stepped PCB motherboard;

[0008] A stepped PCB public board is provided in multiple ways. One end of each of the multiple stepped PCB public boards is provided with a plug that is compatible with a slot. The plug is inserted into the inside of the slot, and the multiple stepped PCB public boards are electrically connected to the stepped PCB mother board.

[0009] A gold finger connecting board, one end of which is inserted into the inside of a slot, and the gold finger connecting board is electrically connected to the stepped PCB motherboard;

[0010] The locking module is provided in multiple ways. All locking modules are installed on the stepped PCB motherboard and near the slot. The locking module is used to fasten the stepped PCB male board and the gold finger connecting board to the stepped PCB motherboard.

[0011] The expansion components are provided in multiple ways. The stepped PCB mother board and the stepped PCB male board have multiple through holes inside. The multiple expansion components are respectively disposed inside the multiple through holes. The expansion components are used to protect the components on the stepped PCB mother board and the stepped PCB male board.

[0012] As a preferred embodiment of the stepped PCB board described in this invention, the locking module includes a locking strip, an elastic strip, a limiting strip, and a first screw;

[0013] The card strip is slidably connected inside the slot of the stepped PCB motherboard. The elastic strip is fixed on the side of the card strip near the inner wall of the slot. The limiting strip is fixed on the side of the card strip near the elastic strip. Through slots are provided at both ends of the slot inside the stepped PCB motherboard and near the limiting strip. The first screw passes through the through slot and contacts the limiting strip.

[0014] As a preferred embodiment of the stepped PCB board of the present invention, a matching slot is provided on the surface of the plurality of stepped PCB public boards and gold finger connecting boards near the position of the card strip.

[0015] In a preferred embodiment of the stepped PCB board of the present invention, when the stepped PCB male board or gold finger connecting board is inserted into the slot of the stepped PCB female board, the elastic strip is deformed by force, and the locking strip is engaged with the slot. When fixing the stepped PCB female board, the first screw passes through the through slot to limit the stepped PCB female board, and at the same time, the first screw limits the limiting strip to prevent the locking strip from detaching from the slot.

[0016] In a preferred embodiment of the stepped PCB board of the present invention, the distance between the two through slots near the two ends of the plug is equal to the length of the plug plus the width of the two retaining strips, and the distance between the two through slots near the two ends of the gold finger connecting plate is equal to the length of the gold finger connecting plate plus the width of the two retaining strips.

[0017] As a preferred embodiment of the stepped PCB board of the present invention, the locking module includes a locking block, an elastic hook, and a second screw. The locking block is slidably connected inside the stepped PCB motherboard and near the slot. The elastic hook is fixed inside the locking block. A through slot is also provided inside the stepped PCB motherboard and near the locking block. The second screw passes through the through slot and contacts the locking block.

[0018] As a preferred embodiment of the stepped PCB board of the present invention, the extension component includes a protruding rod, an elastic extension rod, a locking rod, and a ring;

[0019] The protruding rod passes through the through hole, the locking rod is inserted into the inside of the protruding rod, the elastic extension rod is fixed to the end of the locking rod away from the protruding rod, and the ring is slidably connected to the outside of the elastic extension rod, and the ring is slidably connected to the protruding rod.

[0020] In a preferred embodiment of the stepped PCB board described in this invention, the ring and the protrusion are interference fit.

[0021] In a preferred embodiment of the stepped PCB board described in this invention, the protruding rod is made of rubber.

[0022] A method for manufacturing a stepped PCB board, used in the aforementioned stepped PCB board, comprises the following steps:

[0023] Step 1: Hold the blade and measure the distance between the blade tip and the pressure foot pad;

[0024] Step 2: Measure the blade length and perform compensation;

[0025] Step 3: Move to the PCB board surface and compensate for the distance between the blade tip and the pressure feet.

[0026] Step 4: Perform deep milling;

[0027] Step 5: Drill holes in the blank areas of the PCB board to create pre-reserved through holes;

[0028] Step 6: Create multiple slots on the PCB board;

[0029] Step 7: Install locking modules at both ends of the slot;

[0030] Step 8: Create through slots at both ends of the multiple slots on the PCB board, near the locking module.

[0031] The technical effects achieved by this invention are as follows:

[0032] The present invention, through the structural design of the locking module, initially restricts the connection between the stepped PCB motherboard and the stepped PCB maleboard by means of a locking strip and an elastic strip. When the stepped PCB motherboard is installed, the locking strip is restricted by the first screw, thereby fixing the stepped PCB maleboard and improving the stability between the stepped PCB motherboard and the stepped PCB maleboard.

[0033] This invention, through the structural design of the extension component, addresses the issue of excessively large components exceeding the height of the steps when soldering components onto a stepped PCB motherboard or stepped PCB public board, requiring protection. The extension component is installed in a pre-drilled through-hole. If the height of the added elastic extension rod does not exceed the height of the component, a new elastic extension rod can be added again. This protects the excessively tall components, ensuring their safety and preventing damage. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is an exploded view of the present invention;

[0036] Figure 3 This is a schematic diagram showing the structure where the stepped PCB motherboard and the locking module are separated;

[0037] Figure 4 This is a cross-sectional view of a stepped PCB motherboard;

[0038] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0039] Figure 6 This is a schematic diagram of the second type of locking module separated from the gold finger connecting plate of the present invention;

[0040] Figure 7 This is a schematic diagram of the connection between the second type of locking module and the gold finger connecting plate;

[0041] Figure 8 This is a cross-sectional view of the second type of locking module;

[0042] Figure 9 This is a partial cross-sectional view of the extension component of the present invention;

[0043] Figure 10 This is a schematic diagram of the structure of the first anti-oxidation strip separated from the insert rod in this invention;

[0044] Figure 11 This is a schematic diagram of the connection between the gold finger connecting plate and the stepped PCB motherboard of the present invention;

[0045] Figure 12 This is a schematic diagram of the connection between the gold finger connecting plate and the protection module of the present invention;

[0046] Figure 13 This is the present invention. Figure 8 Enlarged view of point B in the middle.

[0047] The attached diagram lists the components represented by each number as follows:

[0048] 1. Stepped PCB motherboard; 2. Stepped PCB maleboard; 3. Gold finger connecting board; 11. Clip; 12. Elastic strip; 13. Limiting strip; 14. First screw; 21. Clip block; 22. Elastic hook; 23. Second screw; 31. Protruding rod; 32. Elastic extension rod; 33. Clip rod; 34. Ring; 41. Insert rod; 42. First anti-oxidation strip; 51. Second anti-oxidation strip; 52. Connecting rod; 53. Slider; 54. Spring; 55. Elastic card. Detailed Implementation

[0049] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0050] Implementation 1

[0051] like Figures 1 to 3 As shown, a stepped PCB board includes a stepped PCB mother board 1, a stepped PCB male board 2, a gold finger connecting board 3, and a locking module. The stepped PCB mother board 1 has multiple slots. Multiple stepped PCB male boards 2 are provided, and each of the multiple stepped PCB male boards 2 has a plug adapted to the slot at one end. The plug is inserted into the inside of the slot, and the multiple stepped PCB male boards 2 are electrically connected to the stepped PCB mother board 1. One end of the gold finger connecting board 3 is inserted into the inside of the slot and is electrically connected to the stepped PCB mother board 1. Multiple locking modules are provided, and the multiple locking modules are installed on the stepped PCB mother board 1 near the slot. The locking modules are used to fasten the stepped PCB male board 2 and the gold finger connecting board 3 to the stepped PCB mother board 1.

[0052] In use, when the stepped PCB public board 2 or the gold finger connecting board 3 is inserted into the slot, the locking module provides initial fixation, thereby limiting the stepped PCB public board 2 or the gold finger connecting board 3 and fixing it onto the stepped PCB mother board 1. When installing the stepped PCB mother board 1, the locking module provides installation and fixation, and simultaneously fixes the stepped PCB public board 2 or the gold finger connecting board 3 to the stepped PCB mother board 1 again, improving the stability of the connection between the stepped PCB public board 2 or the gold finger connecting board 3 and the stepped PCB mother board 1.

[0053] like Figure 4 and Figure 5 As shown, the locking module includes a locking strip 11, an elastic strip 12, a limiting strip 13, and a first screw 14;

[0054] The clip 11 is slidably connected inside the slot of the stepped PCB motherboard 1. The elastic strip 12 is fixed to the side of the clip 11 near the inner wall of the slot. The limiting strip 13 is fixed to the side of the clip 11 near the elastic strip 12. Through slots are provided at both ends of the slot inside the stepped PCB motherboard 1 and near the limiting strip 13. The first screw 14 passes through the through slot and contacts the limiting strip 13.

[0055] Furthermore, matching slots are provided on the surfaces of multiple stepped PCB public boards 2 and gold finger connecting boards 3 near the position of the card strip 11, so as to facilitate the card strip 11 to be engaged and limited with the stepped PCB public board 2 or the gold finger connecting board 3.

[0056] It should be noted that when the stepped PCB male board 2 or the gold finger connecting board 3 is inserted into the slot of the stepped PCB female board 1, the elastic strip 12 is deformed by force, and the locking strip 11 is engaged in the slot. When fixing the stepped PCB female board 1, the first screw 14 passes through the through slot to limit the stepped PCB female board 1. At the same time, the first screw 14 limits the limiting strip 13 to prevent the locking strip 11 from disengaging from the slot. By limiting the stepped PCB female board 1 for the first time during insertion, the position of the stepped PCB male board 2 or the gold finger connecting board 3 can be easily adjusted or replaced. When installing the stepped PCB female board 1, the locking strip 11 is further limited by the fixing of the first screw 14 and the limitation of the limiting strip 13 by the first screw 14 to prevent the stepped PCB male board 2 or the gold finger connecting board 3 from disengaging from the stepped PCB female board 1.

[0057] It is worth mentioning that the distance between the two through slots near the two ends of the plug is equal to the length of the plug plus the width of the two retaining strips 11, and the distance between the two through slots near the two ends of the gold finger connecting plate 3 is equal to the length of the gold finger connecting plate 3 plus the width of the two retaining strips 11. At the same time as the first screw 14 limits the limit strip 13, the first screw 14 limits the position of the retaining strip 11, preventing the retaining strip 11 from moving laterally inside the slot and ensuring the stability of the fixation.

[0058] Specifically, when the stepped PCB male board 2 or the gold finger connecting board 3 is inserted into the slot of the stepped PCB female board 1, the elastic strip 12 is compressed by force, and the locking strip 11 is engaged in the slot. The elasticity of the elastic strip 12 initially limits the stepped PCB male board 2 or the gold finger connecting board 3, which facilitates the adjustment and replacement of the stepped PCB male board 2 or the gold finger connecting board 3. When the stepped PCB female board 1 is installed on the chassis or control cabinet, the first screw 14 passes through the through slot and connects to the chassis or control cabinet to fix the stepped PCB female board 1. At the same time, the first screw 14 limits the limiting strip 13 and the locking strip 11 to prevent displacement of the limiting strip 13 and the locking strip 11 and improve the stability of the fixation.

[0059] Example 2

[0060] Please see the appendix Figures 6 to 8 As shown, this is the second embodiment of the present invention. This embodiment is a further improvement on the first embodiment, and the difference between it and the first embodiment lies in the different locking modules.

[0061] like Figures 6 to 8 As shown, the locking module includes a locking block 21, an elastic hook 22, and a second screw 23. The locking block 21 is slidably connected inside the stepped PCB motherboard 1 and near the slot. The elastic hook 22 is fixed inside the locking block 21. A through slot is also provided inside the stepped PCB motherboard 1 and near the locking block 21. The second screw 23 passes through the through slot and contacts the locking block 21.

[0062] Furthermore, matching slots are provided on the surfaces of multiple stepped PCB public boards 2 and gold finger connecting boards 3 near the elastic hooks 22, so that the elastic hooks 22 can be engaged with the stepped PCB public boards 2 or gold finger connecting boards 3.

[0063] Specifically, when the stepped PCB public board 2 or the gold finger connecting board 3 is inserted into the slot, the moving block 21 moves the elastic hook 22 to the upper part of the stepped PCB public board 2 or the gold finger connecting board 3. The elastic hook 22 engages with the stepped PCB public board 2 or the gold finger connecting board 3 for initial fixation. When the stepped PCB mother board 1 is installed on the chassis or control cabinet, the second screw 23 passes through the through slot and connects to the chassis or control cabinet to fix the stepped PCB mother board 1. At the same time, the first screw 14 engages with the moving block 21. The locking mechanism is designed to prevent the elastic hook 22 from separating from the slot, thereby improving the stability of the fixation and preventing the stepped PCB public board 2 or gold finger connecting board 3 from falling out of the slot. When disassembling the stepped PCB public board 2 or gold finger connecting board 3, the second screw 23 is rotated to remove the locking block 21, the elastic hook 22 is moved to separate it from the stepped PCB public board 2 or gold finger connecting board 3, and then the locking block 21 is moved to move the elastic hook 22 away from the stepped PCB public board 2 or gold finger connecting board 3 to remove the locking mechanism, thus allowing for disassembly.

[0064] like Figure 10 As shown, the slot is equipped with multiple anti-oxidation modules. The anti-oxidation modules are used to prevent oxidation of the slot surface. The anti-oxidation modules include two insert rods 41 and a first anti-oxidation strip 42. The two insert rods 41 are rotatably connected to the surface of the stepped PCB motherboard 1 and are located at both ends of the slot. The first anti-oxidation strip 42 is inserted into the end of the insert rod 41 away from the stepped PCB motherboard 1.

[0065] It should be noted that a circular groove is provided inside the first anti-oxidation strip 42 and near the insertion rod 41. The insertion rod 41 is inserted into the inside of the circular groove. The diameter of the circular groove is smaller than the diameter of the insertion rod 41. This can increase the friction between the two when the insertion rod 41 is inserted into the inside of the first anti-oxidation strip 42, and ensure the stability of the connection between the insertion rod 41 and the first anti-oxidation strip 42.

[0066] Specifically, when the slot is not in use, the first anti-oxidation strip 42 is rotated so that it adheres to the conductive contact inside the slot, reducing the contact area with oxygen and thus reducing the oxidation time. At the same time, when the conductive contact inside the slot is oxidized, the first anti-oxidation strip 42 is moved away from the insertion rod 41 to separate it from the insertion rod 41. The first anti-oxidation strip 42 is then used to wipe the oxidized area of ​​the conductive contact to remove the oxide layer.

[0067] like Figures 11 to 13 As shown, a protective module is provided on the surface of the gold finger connecting plate 3. The protective module includes a second anti-oxidation strip 51, two connecting rods 52, two sliders 53, two spring pieces 54, and multiple elastic cards 55. The two sliders 53 are slidably connected to both ends of the gold finger connecting plate 3. The two connecting rods 52 are rotatably connected to the ends of the two sliders 53 away from the gold finger connecting plate 3. The two spring pieces 54 are fixed inside both ends of the gold finger connecting plate 3 and close to the sliders 53. The second anti-oxidation strip 51 is snapped between the two connecting rods 52. The multiple elastic cards 55 are all fixed to the ends of the second anti-oxidation strip 51 away from the connecting rods 52.

[0068] Specifically, when the gold finger connecting plate 3 is not in use, the second anti-oxidation strip 51 is rotated so that it adheres to the conductive contact of the gold finger connecting plate 3, reducing the contact area with oxygen. This allows the elastic card 55 to engage with the gold finger connecting plate 3. Simultaneously, the slider 53 presses against the spring 54. The elastic force generated when the spring 54 is pressed causes the slider 53 to move away from the elastic card 55, ensuring that the elastic card 55 adheres tightly to the gold finger connecting plate 3. This improves the stability of fixing the second anti-oxidation strip 51. When the gold finger connecting plate 3 is in use... Move the elastic card 55 to separate it from the gold finger connecting plate 3. Rotate the second anti-oxidation strip 51 to separate it from the conductive contact of the gold finger connecting plate 3, so that the gold finger connecting plate 3 can be plugged in. When the conductive contact of the gold finger connecting plate 3 is oxidized, the connecting rod 52 can be moved out from the inside of the second anti-oxidation strip 51, so that the second anti-oxidation strip 51 is separated from the connecting rod 52. Use the second anti-oxidation strip 51 to wipe the oxidized area of ​​the conductive contact to remove the oxide layer.

[0069] Example 3

[0070] Please see the appendix Figure 9 As shown, this is the third embodiment of the present invention. This embodiment provides a stepped PCB board and also includes multiple expansion components. Multiple through holes are opened inside the stepped PCB mother board 1 and the stepped PCB male board 2. The multiple expansion components are respectively disposed inside the multiple through holes. The expansion components are used to protect the components on the stepped PCB mother board 1 and the stepped PCB male board 2.

[0071] Specifically, when protecting components that exceed the height of the stepped PCB motherboard 1 or the stepped PCB public board 2, the extension components are installed in the through holes to protect the components. If the height of one extension component is insufficient for protection, two extension components are stacked on top of each other to increase the height and protect the components. Multiple extension components can be stacked on top of each other as needed.

[0072] In a preferred embodiment, please refer to the appendix. Figure 9 As shown, the extension includes a protruding rod 31, an elastic extension rod 32, a locking rod 33, and a ring 34;

[0073] The protruding rod 31 passes through the through hole, the locking rod 33 is inserted into the inside of the protruding rod 31, the elastic extension rod 32 is fixed at the end of the locking rod 33 away from the protruding rod 31, and the ring 34 is slidably connected to the outside of the elastic extension rod 32, and the ring 34 is slidably connected to the protruding rod 31.

[0074] It should be noted that the protruding rod 31 is made of rubber. The deformable properties of rubber make it easy for the locking rod 33 to be inserted into the protruding rod 31, reducing the difficulty of insertion.

[0075] It is worth mentioning that the ring 34 and the protruding rod 31 are interference fit, which increases the friction between the ring 34 and the protruding rod 31, enhances the stability of the connection between the ring 34 and the protruding rod 31, and can limit the locking rod 33 inside the protruding rod 31, preventing the locking rod 33 from easily falling out of the protruding rod 31, and ensuring the stability of the connection between the protruding rod 31 and the locking rod 33.

[0076] Specifically, when soldering components onto the stepped PCB motherboard 1 or stepped PCB maleboard 2, if the component's size is too large and exceeds the height of the step, requiring protection, the protruding rod 31 passes through the pre-drilled through hole inside the stepped PCB motherboard 1 or stepped PCB maleboard 2, and the locking rod 33 is inserted into the protruding rod 31. The moving ring 34 is positioned on the outside of the protruding rod 31 near the elastic extension rod 32, thus fixing the locking rod 33 inside the protruding rod 31. If the height of the added elastic extension rod 32 does not exceed the height of the component, a new elastic extension rod 32 can be added again, and the installation can be performed in the above manner to protect the excessively tall component, ensuring its safety and preventing damage.

[0077] The working principle of this invention is as follows: When the stepped PCB public board 2 or the gold finger connecting board 3 is inserted into the slot, it is initially fixed by the locking module, which limits the stepped PCB public board 2 or the gold finger connecting board 3, thus fixing the stepped PCB public board 2 or the gold finger connecting board 3 onto the stepped PCB mother board 1. When installing the stepped PCB mother board 1, it is installed and fixed by the locking module. At the same time, the locking module fixes the stepped PCB public board 2 or the gold finger connecting board 3 to the stepped PCB mother board 1 again, improving the stability of the connection between the stepped PCB public board 2 or the gold finger connecting board 3 and the stepped PCB mother board 1. When protecting components that exceed the height of the stepped PCB mother board 1 or the stepped PCB public board 2, the expansion piece is installed in the through hole to protect the component. If the height of one expansion piece is insufficient for protection, two expansion pieces are stacked to increase the height and protect the component. Multiple expansion pieces can be stacked according to practical needs to ensure the safety of the component and avoid damage.

[0078] This invention also discloses a method for manufacturing a stepped PCB board, specifically including the following steps:

[0079] Step 1: Hold the blade and measure the distance between the blade tip and the pressure foot pad;

[0080] Step 2: Measure the blade length and perform compensation;

[0081] Step 3: Move to the PCB board surface and compensate for the distance between the blade tip and the pressure feet.

[0082] Step 4: Perform deep milling;

[0083] Step 5: Drill holes in the blank areas of the PCB board to create pre-reserved through holes;

[0084] Step 6: Create multiple slots on the PCB board;

[0085] Step 7: Install locking modules at both ends of the slot;

[0086] Step 8: Create through slots at both ends of the multiple slots on the PCB board, near the locking module.

[0087] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A stepped PCB board, characterized by: The utility model relates to a kind of stepped PCB female board (1), the PCB female board (1) is opened with multiple slots; Stepped PCB male board (2) are provided with multiple, the one end of multiple stepped PCB male board (2) is provided with the plug compatible with slot, the plug is inserted in the inside of slot, and multiple stepped PCB male board (2) are electrically connected with stepped PCB female board (1); Gold finger connecting plate (3), one end of the gold finger connecting plate (3) is inserted in the inside of slot, and the gold finger connecting plate (3) is electrically connected with stepped PCB female board (1); Locking module is provided with multiple, multiple locking module is installed on stepped PCB female board (1) and is close to the position of slot, and the locking module is used to make stepped PCB male board (2) and gold finger connecting plate (3) fasten on stepped PCB female board (1); Expansion piece is provided with multiple, the inside of stepped PCB female board (1) and stepped PCB male board (2) is opened with multiple through holes, multiple expansion pieces are respectively arranged in multiple through holes, and the expansion piece is used to protect the component on stepped PCB female board (1) and stepped PCB male board (2); Wherein, the locking module includes clamping strip (11), elastic strip (12), limiting strip (13) and first screw (14); The clamping strip (11) is slidably connected in the slot of the stepped PCB female board (1), the elastic strip (12) is fixed to the side of the clamping strip (11) close to the inner wall of the slot, the limiting strip (13) is fixed to the side of the clamping strip (11) close to the elastic strip (12), both ends of the slot of the stepped PCB female board (1) and close to the position of the limiting strip (13) are provided with a through slot, and the first screw (14) penetrates the through slot and contacts the limiting strip (13), Or the locking module includes clamping block (21), elastic clamping hook (22) and second screw (23), the clamping block (21) is slidably connected in the inside of the stepped PCB female board (1) and close to the position of the slot, the elastic clamping hook (22) is fixed in the inside of the clamping block (21), the inside of the stepped PCB female board (1) and close to the position of the clamping block (21) is also provided with a through slot, and the second screw (23) penetrates the through slot and contacts the clamping block (21); Wherein, the expansion piece includes protruding rod (31), elastic extension rod (32), clamping rod (33) and circular ring (34);The protruding rod (31) penetrates the through hole, the clamping rod (33) is inserted in the inside of the protruding rod (31), the elastic extension rod (32) is fixed to the end of the clamping rod (33) away from the protruding rod (31), the circular ring (34) is slidably connected to the outside of the elastic extension rod (32), and the circular ring (34) is slidably connected with the protruding rod (31). The surface of multiple stepped PCB male board (2) and gold finger connecting plate (3) and close to the position of clamping strip (11) is opened with matching clamping groove.

2. The stepped PCB board of claim 1, wherein: ​ 3. The stepped PCB board of claim 1, wherein: When the stepped PCB public board (2) or the golden finger connecting board (3) is inserted into the slot of the stepped PCB female board (1), the elastic strip (12) is deformed under force, the clamping strip (11) is clamped on the clamping groove, and when the stepped PCB female board (1) is fixed, the first screw (14) penetrates through the through slot to limit the stepped PCB female board (1), and the first screw (14) limits the limiting strip (13), so that the clamping strip (11) is separated from the clamping groove.

4. The stepped PCB board of claim 1, wherein: The distance between the two through slots near the two ends of the plug is equal to the length of the plug plus the width of the two clamping strips (11), and the distance between the two through slots near the two ends of the golden finger connecting board (3) is equal to the length of the golden finger connecting board (3) plus the width of the two clamping strips (11).

5. The stepped PCB board of claim 1, wherein: The circular ring (34) and the convex rod (31) are in interference fit.

6. The stepped PCB board of claim 1, wherein: The material of the convex rod (31) is rubber.

7. A method for producing a stepped PCB board according to any one of claims 1 to 6, characterized by, The steps are as follows: Step 1: hold the knife and measure the distance between the knife tip and the pressure foot pad; Step 2: measure the blade length and compensate; Step 3: move to the PCB surface and compensate the distance between the knife tip and the pressure foot pad Step 4: perform deep milling; Step 5: drill holes in the blank area of the PCB surface to form reserved through holes; Step 6: a plurality of slots are formed on the PCB; Step 7: install the locking module at both ends of the slot; Step 8: a through slot is formed at both ends of the plurality of slots on the PCB, near the locking module.

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