A circuit board that facilitates precise drilling positioning

Abstract

This utility model discloses a circuit board for easy and precise drilling positioning, including a circuit board body, with L-shaped protective plates installed at each of the four corners of the circuit board body. The upper surface of the protective plate has a first positioning hole, and the bottom of the protective plate has a positioning plate. One end of the positioning plate is located on the outer side of the protective plate away from the circuit board body and has a second positioning hole. The bottom of the protective plate has a limiting groove for the positioning plate to be oriented and accommodated. The protective plate is detachably connected to a locking component for locking the positioning plate to the protective plate. The upper surface of the horizontal section of the protective plate is rotatably connected to a connecting ring, and the outer side of the vertical section of the protective plate has a clearance slot for the connecting ring to be rotated 90° and inserted. The bottom of the clearance slot has a sliding groove, and an anti-rotation component for fixing the connecting ring slides up and down in the sliding groove. The upper end of the anti-rotation component is inserted into the connecting ring, and the lower end is connected to the bottom of the sliding groove by a compression spring. The whole has the advantages of high drilling positioning accuracy, high applicability, and good protection.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit board processing, and more specifically, it relates to a circuit board that facilitates precise positioning and drilling. Background Technology

[0002] Circuit boards, also known as PCBs, are essential components of various electronic devices. They are generally used to integrate circuits, miniaturize and visualize circuits, and play an important role in the mass production of fixed circuits and the optimization of electrical appliance layout. In the processing and production of PCBs, drilling is an indispensable operation. For example, multiple mounting holes are drilled near the corners of the circuit board. If the mounting hole positions are not correct, the circuit board cannot be installed. Therefore, it is necessary to fix it in the designated position on the workbench before drilling.

[0003] In current market applications, common circuit board (PCB) positioning during drilling typically involves using tape or positioning screws to splice and fix one or more PCBs to be drilled onto the worktable. However, tape is often ineffective, easily causing PCBs to shift or separate from each other, resulting in poor positioning or splicing. This affects drilling accuracy, increases scrap rates, and raises production costs. Furthermore, since the positions of positioning screws on most drilling machines are fixed, and the distance between adjacent screws in the same group is also fixed, existing PCBs usually only have one set of positioning holes with a specific distance to match the screws. Consequently, smaller PCBs cannot be positioned on worktables where the distance between adjacent screws is greater than the length or width of the PCB, resulting in low applicability. Additionally, the lack of protective structures on the four corners of existing PCBs makes them highly susceptible to breakage during transportation and splicing before drilling. This not only affects the product's appearance but may also impact drilling accuracy. Overall, the problem lies in low drilling accuracy, low applicability, and poor protection. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a circuit board that facilitates precise drilling positioning, and has the advantages of high drilling positioning accuracy, high applicability and good protection.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A circuit board for precise drilling positioning includes a circuit board body. Each of the four corners of the circuit board body has an L-shaped protective plate. The upper surface of the protective plate has a first positioning hole for a positioning screw to pass through. The bottom of the protective plate has a positioning plate. One end of the positioning plate is located on the outer side of the protective plate away from the circuit board body and has a second positioning hole for the positioning screw to pass through. The bottom of the protective plate has a limiting groove for the positioning plate to be oriented and accommodated. The protective plate is detachably connected to a locking assembly for locking the positioning plate to the protective plate. A connecting ring is rotatably connected to the upper surface of the horizontal section of the protective plate. The outer side of the vertical section of the protective plate has a clearance slot for the connecting ring to rotate 90° and insert. The bottom of the clearance slot has a sliding groove. An anti-rotation component for fixing the connecting ring slides up and down within the sliding groove. The upper end of the anti-rotation component is inserted into the inner ring hole of the connecting ring, and a compression spring is connected between the lower end and the bottom of the sliding groove.

[0007] Further configuration: The anti-rotation component includes a positioning post, with connecting rods detachably connected to both sides of the bottom of the positioning post; the top end of the compression spring is connected to the bottom end of the positioning post; a clearance groove is provided at the bottom of the vertical section of the protective plate, and a circular plate is provided inside the clearance groove; a through hole communicating with the clearance groove is provided at the bottom of the sliding groove; the bottom end of the connecting rod passes through the through hole and the circular plate in sequence, and is connected to a limit block; the depth of the sliding groove is greater than the sum of the thickness of the positioning post and the minimum compression thickness of the compression spring.

[0008] Further configuration: The connecting ring includes an annular portion, a connecting rod portion, and a rotating shaft portion whose axial direction is parallel to the thickness direction of the circuit board body. One end of the connecting rod portion is rotatably connected to the upper end face of the horizontal section of the protective plate through the rotating shaft portion. The outer side of the annular portion is integrally formed with the other end of the connecting rod portion. A guide slider is connected to the side of the positioning post. Guide grooves are provided on the inner side of the slide groove and the inner side of the annular portion for the guide slider to pass through.

[0009] Further configuration: The protective plate includes a first cover plate portion arranged in an inverted U-shape and a flat plate portion arranged in an L-shape. The first cover plate portion is detachably connected to the vertical section of the flat plate portion. The upper end face of the vertical section of the flat plate portion and the bottom of the first cover plate portion form the clearance slot. The upper end face of the horizontal section of the flat plate portion is detachably connected to a second cover plate portion for protecting the connecting ring. The second cover plate portion has a clearance through hole to facilitate the exposure of the locking assembly and the rotation of the connecting ring. The first cover plate portion and the second cover plate portion are integrally formed to form a top cover portion. The connecting rod portion is provided with a limiting post that slides up and down. The upper end face of the connecting rod portion has a recessed groove. The top of the limiting post is connected to a baffle. The bottom of the recessed groove and the bottom of the baffle are connected to a first tension spring. The upper end face of the horizontal section of the flat plate portion has a limiting groove for the limiting post to pass through.

[0010] Further configuration: The upper surface of the circuit board body has cross grid lines for drilling positioning etched on all four sides of the non-wiring area. The upper surface of the annular part has four correction grooves arranged in a cross shape. The distance between the midpoint of the cross grid lines and the axis of the rotating shaft is equal to the distance between the center of the annular part and the axis of the rotating shaft. At least two limiting posts are provided, one of which is located between the rotating shaft and the cross grid lines.

[0011] Further configuration: A rotating shaft is connected between the other end of the positioning plate and the top wall of the limiting through groove, and the axial direction of the rotating shaft is parallel to the thickness direction of the circuit board body; after the positioning plate rotates 90° around the rotating shaft outward of the limiting through groove, it is arranged perpendicularly to the limiting through groove, and one side of the other end of the positioning plate contacts a short side wall of the limiting through groove; a plurality of second positioning holes are provided, and they are evenly arranged along the line connecting the two ends of the positioning plate.

[0012] Further configuration: The locking assembly includes a limiting rod and a stop block. The top of the limiting rod is fixedly connected to the bottom of the stop block. A groove is provided on the upper surface of the horizontal section of the protective plate. A second tension spring is connected between the bottom of the groove and the bottom of the stop block. A limiting hole for the limiting rod to pass through is provided in the middle of the groove. Two insertion slots for the limiting rod to pass through are provided on the upper surface of the other end of the positioning plate. The centers of the two insertion slots are respectively perpendicular to the line connecting the center of the rotating shaft. The distances between the centers of the two insertion slots and the center of the rotating shaft, and the distance between the center of the limiting hole and the center of the rotating shaft are all equal.

[0013] Further features: sliders are provided on both sides of the positioning plate, sliding grooves are provided on both sides of the limiting groove for the sliders to slide back and forth along the width of the protective plate, and a scale groove is provided on one side of the upper end face of the positioning plate.

[0014] Further configuration: The locking assembly includes a limiting rod and a stop block. The top of the limiting rod is fixedly connected to the bottom of the stop block. A groove is provided on the upper surface of the horizontal section of the protective plate. A second tension spring is connected between the bottom of the groove and the bottom of the stop block. A limiting hole for the limiting rod to pass through is provided in the middle of the groove. Several insertion slots for the limiting rod to pass through are provided on the upper surface of the positioning plate along the width direction of the protective plate.

[0015] Further configuration: Each of the protective plates has a positioning plate, a limiting groove and a locking component at the bottom of the horizontal and vertical sections, and the limiting groove and the sliding groove on the same side are arranged in a staggered manner.

[0016] Further configuration: Each of the protective plates has only one positioning plate and one limiting through groove, and both are located at the bottom of the horizontal or vertical section of the protective plate.

[0017] In summary, this utility model uses four L-shaped protective plates to protect the four corners of the circuit board body, preventing the corners from cracking due to impact. Through the use of anti-rotation components, compression springs, slides, connecting rings, clearance slots, and circular plates, only one circuit board body needs to be pulled down to lower the circular plate, causing the anti-rotation component to descend from the clearance slot into the slide. Then, the connecting ring of the other circuit board is rotated and inserted into the clearance slot of the first circuit board. Finally, the circular plate is released, allowing the anti-rotation component to move upwards into the clearance slot until the circuit board... The upper end of the anti-rotation component is inserted into the inner ring hole of the connecting ring, which enables the rapid assembly of two adjacent circuit board bodies. Through the first positioning hole, positioning plate, locking component and second positioning hole, users can choose the first positioning hole or the second positioning hole to match the positioning screw with the corresponding size and distance according to the positioning screw of different sizes and distances on different worktables, so as to improve the applicability of the overall use. The limiting through groove is used to store the positioning plate, reduce the area occupied by the positioning plate, and prevent the positioning plate from protruding from the protective plate and affecting the assembly of the circuit board.

[0018] This utility model integrates the functions of rapid assembly of multiple circuit boards, locking after assembly, and corner protection. By setting a positioning plate, a first positioning hole, and a second positioning hole on the protective plate, it not only enables a single-size circuit board to be compatible with positioning screws of various sizes and distances, but also eliminates the need to drill positioning holes on the circuit board, avoiding damage to the integrity of the circuit board due to excessive drilling. It solves the problem of affecting drilling positioning accuracy due to circuit board positioning misalignment, separation of spliced ​​circuit boards, or breakage of four sides and corners. Overall, it has the advantages of high drilling positioning accuracy, high applicability, and good protection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the circuit board after assembly according to Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a single circuit board according to Embodiment 1 of this utility model;

[0021] Figure 3 This is a partial structural diagram of the protective plate in Embodiment 1 of this utility model;

[0022] Figure 4 This is a partial cross-sectional view of the anti-rotation component and connecting ring after removing the top cover in Embodiment 1 of this utility model;

[0023] Figure 5This is a partial exploded view of Embodiment 1 of the present invention;

[0024] Figure 6 This is a top view of Embodiment 2 of the present invention;

[0025] Figure 7 This is an exploded view of the protective plate in Embodiment 2 of this utility model;

[0026] Figure 8 This is a schematic diagram of the overall structure of Embodiment 3 of this utility model;

[0027] Figure 9 This is a bottom view of Embodiment 3 of the present invention;

[0028] Figure 10 This is a structural schematic diagram of Embodiment 4 of the present utility model.

[0029] In the diagram: 1. Circuit board body; 2. Protective plate; 3. First positioning hole; 4. Positioning plate; 5. Second positioning hole; 6. Limiting through groove; 7. Locking assembly; 8. Connecting ring; 9. Clearance slot; 10. Slide groove; 11. Compression spring; 12. Positioning post; 13. Connecting rod; 14. Clearance groove; 15. Through hole; 16. Circular plate; 17. Annular part; 18. Connecting rod part; 19. Rotating shaft part; 20. Guide slider; 1. Guide groove; 22. Cross grid lines; 23. Correction groove; 24. Limiting post; 25. Sinking groove; 26. Baffle; 27. First tension spring; 28. Limiting groove; 29. ​​Rotating shaft; 30. Limiting rod; 31. Stop block; 32. Groove; 33. Second tension spring; 34. Limiting hole; 35. Insertion groove; 36. Sliding block; 37. Sliding groove; 38. Limiting block; 39. Top cover; 40. Flat plate. Detailed Implementation

[0030] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. It should be noted that the terms "upper" and "lower" used in the following description refer to the attached drawings. Figure 1 and 6 The direction in the middle, the words "bottom" and "top" refer to the attached Figure 1 and 6 The direction of the center of a specific component's geometry, and the "thickness of the positioning post" throughout the text, are as follows: Figure 6 The vertical distance d1 between the upper and lower end faces of the positioning post shown, and the "compression thickness of the compression spring" are as follows: Figure 6 The compression spring shown is defined as follows: the vertical distance d2 between the two ends of the compressed spring after compression; the "depth of the groove" is the vertical distance h between the groove opening and the groove bottom; additionally, it should be noted that the "horizontal section" and "vertical section" of the protective plate described throughout the text refer to sections such as... Figure 6The protective panel should be in the shape of a positive "L" with horizontal and vertical sections, not as shown in the attached image. Figure 8 The image shows three types of protective plates, each arranged in a forward "L" shape, rotated 90°, 180°, and 270° around the center point of the circuit board body, with a horizontal and vertical section respectively.

[0031] The most crucial concept of this utility model lies in the fact that the protective plate 2 enhances the overall protection. By setting the positioning plate 4, the first positioning hole 3, and the second positioning hole 5 on the protective plate 2, it not only allows a circuit board of one size to be positioned by positioning screws of various sizes and distances, but also eliminates the need for positioning drilling on the circuit board, avoiding damage to the integrity of the circuit board due to excessive drilling. Combined with the anti-rotation component, the clearance slot 9, and the compression spring 11, it enables the rapid fixed assembly of multiple circuit boards while preventing the circuit boards from accidentally separating after assembly. Overall, it avoids situations where the drilling positioning accuracy is affected by circuit board positioning misalignment, separation of interconnected circuit boards, or breakage of the four sides and corners. It has the advantages of high drilling positioning accuracy, high applicability, and good protection.

[0032] Please refer to Figures 1 to 5 As shown, the first embodiment of this utility model is as follows: a circuit board for easy and precise positioning of drilling, including a circuit board body 1, with L-shaped protective plates 2 installed at each of the four corners of the circuit board body 1. The upper surface of the protective plate 2 has a first positioning hole 3 for the positioning screw to pass through, and a positioning plate 4 is provided at the bottom of the protective plate 2. One end of the positioning plate 4 is located on the outer side of the protective plate 2 away from the circuit board body 1, and has a second positioning hole 5 for the positioning screw to pass through. The bottom of the protective plate 2 has a limiting space for the positioning plate 4 to be oriented and moved. The protective plate 2 is detachably connected to a locking assembly 7 for locking the positioning plate 4 to the protective plate 2; a connecting ring 8 is rotatably connected to the upper end face of the horizontal section of the protective plate 2; a clearance slot 9 is provided on the outer side of the vertical section of the protective plate 2 for the connecting ring 8 to rotate 90° and be inserted; a sliding groove 10 is provided at the bottom of the clearance slot 9; an anti-rotation component for fixing the connecting ring 8 is slidably connected up and down in the sliding groove 10; the upper end of the anti-rotation component is inserted into the inner ring hole of the connecting ring 8, and a compression spring 11 is connected between the lower end and the bottom of the sliding groove 10.

[0033] As described above, when drilling is required for assembling multiple circuit boards, firstly, the connecting ring 8 of the protective plate 2 of one circuit board body 1 is rotated and inserted into the clearance slot 9 of the adjacent protective plate 2 of another circuit board body 1 through the protective plate 2, connecting ring 8, and clearance slot 9, which serves to initially limit the assembly of the two adjacent circuit board bodies 1; then, through the anti-rotation component, compression spring 11, and slide groove 10, a downward force is first manually applied to the anti-rotation component of one of the protective plates 2 of the other circuit board body 1 until the anti-rotation component moves completely downward to the slide groove 10. Inside the slot 10, the connecting ring 8, which has been inserted into the relief slot 9, is rotated towards the position where the slide groove 10 is located, until the connecting ring 8 is rotated directly above the slide groove 10. At this time, the inner hole of the connecting ring 8 is connected to the slide groove 10. The protective plate 2 is released, and under the action of the rebound force of the compression spring 11, the anti-rotation component slides upward in the slide groove 10 until the upper end of the anti-rotation component is inserted into the inner ring hole of the connecting ring 8, which can prevent the connecting ring 8 from continuing to rotate in the relief slot 9, and play the role of fixing and assembling the two adjacent circuit board bodies 1 again.

[0034] After assembling multiple circuit boards, the first positioning hole 3, the positioning plate 4, and the second positioning hole 5 allow users to select either the first positioning hole 3 or the second positioning hole 5 to match the positioning screws of different sizes and distances on different workbenches for positioning. That is, when the distance between adjacent positioning screws on the same side of the workbench is equal to the distance between adjacent first positioning holes 3, the first positioning hole 3 is used for the positioning screw to pass through for positioning. When the distance between adjacent positioning screws on the same side of the workbench is greater than a certain value, the second positioning hole 5 of the positioning plate 4 can be used. This allows a circuit board of one size to be used with positioning screws of various sizes and distances for positioning, thereby improving the overall applicability. The limiting through groove 6 is used to store the positioning plate 4, preventing the positioning plate 4 from protruding from the protective plate 2 and affecting the assembly between adjacent circuit board bodies 1, while also reducing the area occupied by the positioning plate 4. The locking component 7 facilitates locking the positioning plate 4 in the open or closed state. In addition, the protective plate 2 protects the four corners of the circuit board body 1, preventing the four corners of the circuit board from being broken after being impacted.

[0035] Furthermore, the anti-rotation component includes a positioning post 12, with connecting rods 13 detachably connected to both sides of the bottom of the positioning post 12. The top of the compression spring 11 is connected to the bottom of the positioning post 12. A clearance groove 14 is provided at the bottom of the vertical section of the protective plate 2. A circular plate 16 is provided inside the clearance groove 14. A through hole 15 communicating with the clearance groove 14 is provided at the bottom of the sliding groove 10. The bottom of the connecting rod 13 passes through the through hole 15 and the circular plate 16 in sequence and is connected to a limit block 38. The depth of the sliding groove 10 is greater than the sum of the thickness of the positioning post 12 and the minimum compression thickness of the compression spring 11.

[0036] In addition, to facilitate the assembly and disassembly of the anti-rotation component, the detachable connection between the top of the connecting rod 13 and the bottom of the positioning post 12 can be a threaded connection, not limited to the above-mentioned detachable connection method. Other detachable connection methods that can remove the connecting rod 13 and the circular plate 16 from the positioning post 12 (such as snap-fit ​​or plug-in connection) are also acceptable. The clearance groove 14 is provided to prevent the circular plate 16 from protruding from the bottom of the vertical section of the protective plate 2. To facilitate the gripping of the circular plate 16, a structure that facilitates gripping can be provided on the circular plate 16 (not shown in the figure).

[0037] Furthermore, the connecting ring 8 includes an annular portion 17, a connecting rod portion 18, and a rotating shaft portion 19 whose axial direction is parallel to the thickness direction of the circuit board body 1. One end of the connecting rod portion 18 is rotatably connected to the upper end face of the horizontal section of the protective plate 2 through the rotating shaft portion 19. The outer side of the annular portion 17 is integrally formed with the other end of the connecting rod portion 18. The side of the positioning post 12 is connected to a guide slider 20. The inner side of the slide groove 10 and the inner side of the annular portion 17 are both provided with guide grooves 21 for the guide slider 20 to pass through.

[0038] The guide slider 20 and guide groove 21 are set to ensure that the positioning column 12 moves upward or downward while further limiting the annular part 17, so as to prevent the annular part 17 and the positioning column 12 from rotating due to the misalignment of the two protective plates 2 to be spliced, and further ensure the assembly stability.

[0039] Furthermore, the protective plate 2 includes a first cover plate portion arranged in an inverted U-shape and a flat plate portion 40 arranged in an L-shape. The first cover plate portion is detachably connected to the vertical section of the flat plate portion 40. A clearance slot 9 is formed between the upper end face of the vertical section of the flat plate portion 40 and the bottom of the first cover plate portion. A second cover plate portion for protecting the connecting ring 8 is detachably connected to the upper end face of the horizontal section of the flat plate portion 40. The second cover plate portion has a clearance through hole (not shown in the figure, but the same applies throughout the text) to facilitate the rotation of the connecting ring 8 and the exposure of the locking assembly. The first cover plate portion and the second cover plate portion are integrally formed to form a top cover portion 39. The connecting rod portion 18 slides up and down and is provided with a limiting post 24. A groove 25 is provided on the upper end face of the connecting rod portion 18. A baffle 26 is connected to the top of the limiting post 24. A first tension spring 27 is connected between the bottom of the groove 25 and the bottom of the baffle 26. A limiting groove 28 for the limiting post 24 to pass through is provided on the upper end face of the horizontal section of the flat plate portion 40.

[0040] The first cover plate is detachably connected to the flat plate 40 to facilitate the assembly and disassembly of the anti-rotation component. The second cover plate is provided to prevent the connecting ring 8 from being exposed when not in use, making the protective plate 2 more aesthetically pleasing. The limiting post 24, the recess 25, the baffle 26, the first tension spring 27, and the limiting groove 28 are used to lock the connecting ring 8 to the upper end face of the flat plate 40. When it is necessary to release the locking effect on the connecting ring 8, simply grasp the baffle 26 manually, lift the baffle 26 upwards, and move the limiting post 24 upwards until the bottom of the limiting post 24 is completely away from the limiting groove 28, thus releasing the locking effect of the limiting post 24 on the connecting ring 8. At this time, the connecting ring 8 is in a rotatable state. When the connecting ring 8 and the locking assembly need to work, the through hole facilitates manual locking or unlocking of the locking assembly, or manual rotation of the connecting ring 8.

[0041] Furthermore, a rotating shaft 29 is connected between the other end of the positioning plate 4 and the top wall of the limiting through groove 6. The axial direction of the rotating shaft 29 is parallel to the thickness direction of the circuit board body 1. After the positioning plate 4 rotates 90° outward around the rotating shaft 29 toward the limiting through groove 6, it is arranged perpendicularly to the limiting through groove 6. One side of the other end of the positioning plate 4 contacts a short side wall of the limiting through groove 6. Several second positioning holes 5 are provided and are evenly arranged along the line connecting the two ends of the positioning plate 4. By setting multiple second positioning holes 5 in this way, multiple positioning holes with different vertical distances from the first positioning hole 3 can be used to meet the needs of positioning screws with different standard distance dimensions. Here, the different distances refer to the distance between two adjacent positioning screws on the same side in the same group of positioning screws.

[0042] Furthermore, the locking assembly 7 includes a limiting rod 30 and a stop block 31. The top of the limiting rod 30 is fixedly connected to the bottom of the stop block 31. A groove 32 is provided on the upper surface of the horizontal section of the protective plate 2. A second tension spring 33 is connected between the bottom of the groove 32 and the bottom of the stop block 31. A limiting hole 34 for the limiting rod 30 to pass through is provided in the middle of the groove 32. Two insertion slots 35 for the limiting rod 30 to pass through are provided on the upper surface of the other end of the positioning plate 4. The centers of the two insertion slots 35 are respectively perpendicular to the line connecting the center of the rotating shaft 29. The distance between the center of the two insertion slots 35 and the center of the rotating shaft 29, and the distance between the center of the limiting hole 34 and the center of the rotating shaft are all equal.

[0043] As described above, when the locking assembly 7 is in the locked state, under the downward pulling force of the second tension spring 33, the bottom of the stop block 31 abuts against the upper end face of the horizontal section of the protective plate 2, the second tension spring 33 is completely located in the groove 32, and the bottom of the limiting rod 30 is inserted into one of the insertion slots 35 of the positioning plate 4. When the locking assembly 7 is in the locked state, the bottom of the stop block 31 leaves the upper end face of the horizontal section of the protective plate 2 when the external force pulls the stop block 31 upward, and the upper end of the second tension spring 33 leaves the groove 32 and is in a stretched state. When the bottom of the limiting rod 30 is completely separated from the insertion groove 35, the positioning plate 4 is located in the limiting through groove 6, that is, in the closed state. At this time, the insertion groove 35 communicating with the limiting hole 34 is a locking insertion groove 35, and the bottom of the limiting rod 30 is inserted into the insertion groove 35 and locked. Similarly, when the positioning plate 4 is rotated 90° outward from the limiting through groove 6, that is, when the positioning plate 4 is in the open state, the other insertion groove 35 communicating with the limiting hole 34 is an opening locking insertion groove 35, and the bottom of the limiting rod 30 is inserted into this insertion groove 35 and locked.

[0044] Furthermore, each protective plate 2 has only one positioning plate 4 and one limiting groove 6, and both are located at the bottom of the horizontal or vertical section of the protective plate 2.

[0045] Workflow: When drilling holes for assembling multiple circuit boards, first, take one circuit board and pull down its circular plate 16, causing the limiting block 38 and connecting rod 13 to move downwards within the through hole 15, thereby causing the corresponding positioning post 12 to move downwards completely away from the clearance slot 9 and into the slide groove 10. Then, rotate the adjacent connecting ring 8 of the other circuit board by 90° until the connecting ring 8 is inserted into the slide groove 10 above the clearance slot 9 of the previous circuit board. Then, release the circular plate 16. Under the action of the rebound force of the compression spring 11, the upper end of the positioning post 12 moves upwards away from the slide groove 10 until the upper end of the positioning post 12 passes through the inner ring hole of the connecting ring 8. The upper end of the guide slider 20 moves into the guide groove 21 of the connecting ring 8, so that the two adjacent circuit boards can be quickly assembled and locked.

[0046] Afterwards, if the distance between adjacent positioning screws on the same side of the workbench is equal to the distance between adjacent first positioning holes 3, the first positioning hole 3 is directly selected for the positioning screw to pass through for positioning; if the distance between adjacent positioning screws on the same side of the workbench is large, find the two or four sides of the circuit board that are not assembled, pull up the blocks 31 on these sides, and drive the limit rod 30 to move upward in the limit hole 34 until the bottom of the limit rod 30 completely leaves the insertion slot 35 used for locking the positioning plate 4, then the locking state of the positioning plate 4 can be released. Then rotate the positioning plate 4 90° outward towards the limit through slot 6, release the block 31, and under the action of the rebound force of the second tension spring 33, the limit rod 30 moves down into another insertion slot 35 of the positioning plate 4, and the open positioning plate 4 can be locked. Select the second positioning hole 5 on the positioning plate 4 with the corresponding standard distance size and cooperate with the positioning screw for positioning. When it is necessary to close the positioning plate 4, the steps are reversed.

[0047] Example 2 differs from Example 1 in that, as Figure 6 and Figure 7 As shown, both sides of the positioning plate 4 are provided with slider parts 36, and both sides of the limiting through groove 6 are provided with sliding grooves 37 for the slider parts 36 to slide back and forth along the width direction of the protective plate 2. A scale groove is provided on one side of the upper end surface of the positioning plate 4 (not shown in the figure, the same throughout the text); the locking assembly 7 includes a limiting rod 30 and a stop block 31. The top of the limiting rod 30 is fixedly connected to the bottom of the stop block 31. A groove 32 is provided on the upper end surface of the horizontal section of the protective plate 2. A second tension spring 33 is connected between the bottom of the groove 32 and the bottom of the stop block 31. A limiting hole 34 is provided in the middle of the groove 32 for the limiting rod 30 to pass through. Several insertion grooves 35 for the limiting rod 30 to pass through are provided on the upper end surface of the positioning plate 4 along the width direction of the protective plate 2.

[0048] As described above, when the distance between adjacent positioning screws on the same side of the workbench is large, i.e., when positioning plate 4 is required, locate the two or four sides of the unassembled circuit board, pull up the stops 31 on these sides, causing the limiting rod 30 to move upwards within the limiting hole 34 until the bottom of the limiting rod 30 is completely away from the insertion slot 35 on the positioning plate 4 that is furthest from its circuit board body 1. This releases the locking state of the positioning plate 4. Then, pull the positioning plate 4 outwards toward the limiting through slot 6 until the value displayed in the scale slot is the distance dimension of the positioning screw to be matched and positioned. Release the stops 31, and proceed to the second... Under the rebound force of the tension spring 33, the limiting rod 30 moves down into the insertion groove 35 on the positioning plate 4 that communicates with the limiting hole 34, thus locking the positioning plate 4 after tension adjustment. The second positioning hole 5 on the positioning plate 4, which corresponds to the standard distance size, is then matched with the positioning screw for positioning. When it is necessary to close the positioning plate 4, the locking component 7 is re-engaged to lock the positioning plate 4 into the limiting through groove 6. The slider part 36 and the sliding groove 37 are designed to ensure the stability of the sliding connection of the positioning plate 4 in the limiting through groove 6 and to prevent the positioning plate 4 from shaking and affecting the subsequent drilling positioning effect.

[0049] Example 3 differs from Examples 1 and 2 in that, as follows: Figure 8 As shown, each protective plate 2 has a positioning plate 4 and a limiting groove 6 at the bottom of the horizontal and vertical sections. The limiting groove 6 on the same side is staggered with the sliding groove 10. In addition, when the circuit board is installed on the object that needs the circuit board, the second positioning hole 5 on the positioning plate 4 can also be used as a mounting hole to meet the special case where the distance between adjacent screw holes of the object that needs the circuit board (when the distance meets the standard distance corresponding to the second positioning hole) is greater than the adjacent mounting hole on the circuit board, thus avoiding the need to re-drill holes in the object to be installed with the circuit board.

[0050] Example 4 differs from Example 1 in that, as Figure 9 As shown, the upper surface of the circuit board body 1 has cross grid lines 22 etched on all four sides of the non-wiring area for drilling positioning. The upper surface of the annular part 17 has four correction grooves 23 arranged in a cross shape. The distance between the midpoint of the cross grid line 22 and the axis of the rotating shaft part 19 is equal to the distance between the center of the annular part 17 and the axis of the rotating shaft part 19. At least two limiting posts 24 are provided, one of which is a limiting groove 28 located between the rotating shaft part 19 and the cross grid line 22.

[0051] As described above, the cross grid lines 22 are used to mark the center of the mounting hole to be drilled, which initially improves the positioning accuracy of subsequent drilling. The correction groove 23 of the annular part 17 can be used to check whether the position of the cross grid lines 22 etched on the circuit board body 1 is accurate, thus doubly ensuring the positioning accuracy of the mounting hole to be drilled. The inspection procedure is as follows: before assembly, rotate the connecting ring 8 90° towards the inside of the protective plate 2 (i.e., towards the circuit board body 1). At this time, the annular part of the connecting ring 8... Part 17 is located directly above the nearest cross grid line 22. The limiting post 24 is inserted into the limiting groove 28 between the rotating shaft part 19 and the cross grid line 22 to lock the connecting ring 8. If the horizontal or vertical line of the cross grid line 22 is significantly offset from the horizontal or vertical segment of the correction groove 23, it means that the etching position of the cross grid line 22 is inaccurate. The operator can rework the circuit board and re-etch it, or when drilling this hole, the drill bit can be offset to the center of the annular part 17 to ensure the accuracy of the drilling.

[0052] In summary, compared with the prior art, this utility model has the advantages of high drilling positioning accuracy, high applicability, and good protection; the protective plate 2 provides protection for the four sides and corners of the circuit board body 1; the anti-rotation component, compression spring 11, slide groove 10, connecting ring 8, clearance slot 9, and round plate 16 are used to splice and lock adjacent protective plates 2 between two circuit board bodies 1, preventing the spliced ​​circuit board from being accidentally separated and affecting the subsequent drilling positioning accuracy; by setting the first positioning hole 3, positioning plate 4, locking component 7, and second positioning hole 5 on the protective plate 2, it prevents... This design allows users to easily use positioning screws of different sizes and distances on different workbenches, enabling a single-size circuit board to accommodate positioning screws of various sizes and distances, thus improving overall usability. It also eliminates the need for drilling positioning holes on the circuit board, avoiding damage to the board's integrity due to excessive drilling. Furthermore, it solves the problem of drilling positioning accuracy being affected by circuit board positioning misalignment, separation of spliced ​​circuit boards, or breakage at the four corners. The limiting through-slot 6 is used to accommodate the positioning plate 4, reducing its footprint and preventing it from protruding from the protective plate 2 and affecting circuit board assembly.

[0053] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A circuit board for easy and precise positioning of drill holes, characterized in that: The circuit board includes a circuit board body, with L-shaped protective plates installed at each of its four corners. The upper surface of each protective plate has a first positioning hole for a positioning screw to pass through, and a positioning plate is located at the bottom of the protective plate. One end of the positioning plate is located on the outer side of the protective plate away from the circuit board body and has a second positioning hole for the positioning screw to pass through. The bottom of the protective plate has a limiting groove for the positioning plate to be oriented and accommodated. The protective plate is detachably connected to a locking assembly for locking the positioning plate to the protective plate. A connecting ring is rotatably connected to the upper surface of the horizontal section of the protective plate, and a clearance slot is provided on the outer side of the vertical section of the protective plate for the connecting ring to rotate 90° and insert. A sliding groove is provided at the bottom of the clearance slot, and an anti-rotation component for fixing the connecting ring slides up and down within the sliding groove. The upper end of the anti-rotation component is inserted into the inner ring hole of the connecting ring, and a compression spring is connected between the lower end and the bottom of the sliding groove.

2. The circuit board of claim 1, wherein: The anti-rotation component includes a positioning post, with connecting rods detachably connected to both sides of the bottom of the positioning post. The top of the compression spring is connected to the bottom of the positioning post. A clearance groove is provided at the bottom of the vertical section of the protective plate, and a circular plate is provided inside the clearance groove. A through hole communicating with the clearance groove is provided at the bottom of the sliding groove. The bottom of the connecting rod passes through the through hole and the circular plate in sequence, and is connected to a limit block. The depth of the sliding groove is greater than the sum of the thickness of the positioning post and the minimum compression thickness of the compression spring.

3. A circuit board facilitating accurate positioning of a drill hole according to claim 2, characterized in that: The connecting ring includes an annular portion, a connecting rod portion, and a rotating shaft portion whose axial direction is parallel to the thickness direction of the circuit board body. One end of the connecting rod portion is rotatably connected to the upper end face of the horizontal section of the protective plate through the rotating shaft portion. The outer side of the annular portion is integrally formed with the other end of the connecting rod portion. A guide slider is connected to the side of the positioning post. Guide grooves are provided on the inner side of the slide groove and the inner side of the annular portion for the guide slider to pass through.

4. The circuit board of claim 3, wherein: The protective plate includes a first cover plate portion arranged in an inverted U-shape and a flat plate portion arranged in an L-shape. The first cover plate portion is detachably connected to the vertical section of the flat plate portion. The upper end face of the vertical section of the flat plate portion and the bottom of the first cover plate portion form the clearance slot. The upper end face of the horizontal section of the flat plate portion is detachably connected to a second cover plate portion for protecting the connecting ring. The second cover plate portion has a clearance through hole to facilitate the exposure of the locking assembly and the rotation of the connecting ring. The first cover plate portion and the second cover plate portion are integrally formed to form a top cover portion. The connecting rod portion is provided with a limiting post that slides up and down. The upper end face of the connecting rod portion has a recessed groove. The top of the limiting post is connected to a baffle. The bottom of the recessed groove and the bottom of the baffle are connected to a first tension spring. The upper end face of the horizontal section of the flat plate portion has a limiting groove for the limiting post to pass through.

5. The circuit board of claim 4, wherein: The upper surface of the circuit board body has cross grid lines etched on all four sides of the non-wiring area for drilling positioning. The upper surface of the annular part has four correction grooves arranged in a cross shape. The distance between the midpoint of the cross grid line and the axis of the rotating shaft is equal to the distance between the center of the annular part and the axis of the rotating shaft. At least two limiting posts are provided, one of which is located between the rotating shaft and the cross grid line.

6. The circuit board of claim 1, wherein: The other end of the positioning plate is connected to the top wall of the limiting groove by a rotating shaft, the axis of which is parallel to the thickness direction of the circuit board body; after the positioning plate rotates 90° outward around the rotating shaft, it is arranged perpendicularly to the limiting groove; one side of the other end of the positioning plate contacts a short side wall of the limiting groove; a plurality of second positioning holes are provided and are evenly arranged along the line connecting the two ends of the positioning plate.

7. A circuit board for easy and precise positioning of drill holes according to claim 6, characterized in that: The locking assembly includes a limiting rod and a stop. The top of the limiting rod is fixedly connected to the bottom of the stop. A groove is provided on the upper surface of the horizontal section of the protective plate. A second tension spring is connected between the bottom of the groove and the bottom of the stop. A limiting hole for the limiting rod to pass through is provided in the middle of the groove. Two insertion slots for the limiting rod to pass through are provided on the upper surface of the other end of the positioning plate. The centers of the two insertion slots are respectively perpendicular to the line connecting the center of the rotating shaft. The distance between the centers of the two insertion slots and the center of the rotating shaft, and the distance between the center of the limiting hole and the center of the rotating shaft are all equal.

8. The circuit board of claim 1, wherein: Both sides of the positioning plate are provided with sliders, and both sides of the limiting groove are provided with sliding grooves for the sliders to slide back and forth along the width direction of the protective plate. A scale groove is provided on one side of the upper end face of the positioning plate.

9. The circuit board of claim 8, wherein: The locking assembly includes a limiting rod and a stop. The top of the limiting rod is fixedly connected to the bottom of the stop. A groove is provided on the upper surface of the horizontal section of the protective plate. A second tension spring is connected between the bottom of the groove and the bottom of the stop. A limiting hole for the limiting rod to pass through is provided in the middle of the groove. Several insertion slots for the limiting rod to pass through are provided on the upper surface of the positioning plate along the width direction of the protective plate.

10. The circuit board of claim 1, wherein: Each of the protective plates has only one positioning plate and one limiting groove, and both are located at the bottom of the horizontal or vertical section of the protective plate.

Images