A circuit board drilling positioning device

Abstract

The utility model discloses a circuit board drilling positioning device, including base, punch mechanism, positioning mechanism and air outlet mechanism. Punch mechanism contains placing rack and movable drilling head, and placing rack is connected to base, and drilling head is located placing rack top, positioning mechanism is connected to placing rack, is used for fixed circuit board, air outlet mechanism includes air pump, air outlet plate body and mesh enclosure, and air pump fixed mounting is in placing rack side, and air outlet plate body is connected to placing rack one side near positioning mechanism, and is set up with a plurality of air hole towards positioning mechanism on it, and mesh enclosure is detachably connected to placing rack and covers air hole setting. The present application prevents air hole blockage through detachable mesh enclosure, improves the effect of cleaning the debris, reduces equipment maintenance cost and downtime, has gas flow switching function simultaneously, improves the practicability and reliability of the device.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit board processing equipment, and in particular to a circuit board drilling positioning device. Background Technology

[0002] During circuit board drilling, air vents are typically used to blow away drilling debris using air pressure, keeping the work area clean. However, existing air vents have several problems: larger debris can easily enter the vents, causing blockages, affecting the air vent's normal operation, and reducing debris removal efficiency. Once the vents are blocked, frequent cleaning and maintenance of the air vent are required, increasing equipment maintenance costs and downtime. Furthermore, debris accumulation can affect circuit board positioning and drilling quality. Summary of the Invention

[0003] This utility model aims to at least partially solve one of the problems in related technologies. Therefore, one objective of this utility model is to provide a circuit board drilling positioning device to solve the problem of existing venting plates having their vent holes easily blocked by large debris, thereby improving the working efficiency of the venting plate and reducing equipment maintenance costs and downtime.

[0004] A circuit board drilling positioning device, the circuit board drilling positioning device comprising: Base; A drilling mechanism, comprising a mounting frame and a movable drill head, wherein the mounting frame is connected to the base and the drill head is positioned above the mounting frame; A positioning mechanism, connected to the placement frame, is used to fix the circuit board; The air outlet mechanism includes an air pump, an air outlet plate body, and a mesh cover. The air pump is fixedly installed on the side of the placement frame. The air outlet plate body is connected to the side of the placement frame near the positioning mechanism. The air outlet plate body has several air holes facing the positioning mechanism. The mesh cover is detachably connected to the placement frame and covers the air holes.

[0005] Furthermore, the side of the air outlet plate body is provided with a mounting flange, the mounting flange is provided with a mounting hole, the edge of the mesh cover is provided with a connecting part that cooperates with the mounting flange, a fastener is installed on the connecting part, and the mesh cover is fixed to the air outlet plate body by the fastener passing through the mounting hole.

[0006] Furthermore, the mesh cover is made of stainless steel.

[0007] Furthermore, the mesh size of the mesh cover is smaller than the aperture of the air pores.

[0008] Furthermore, the mesh of the mesh cover is circular, square, or rhomboid in shape.

[0009] Furthermore, the air outlet plate body also includes a reverse air outlet pipe and a movable baffle. The air inlet end of the reverse air outlet pipe is connected to the side of the air outlet plate body, and the air inlet end extends to the side of the mesh cover away from the air outlet plate body. The movable baffle is movably disposed in the air outlet plate body so that gas can flow to the air hole or the reverse air outlet pipe.

[0010] Furthermore, the air outlet plate body also includes a movable rod, and the movable baffle includes a first blocking part and a second blocking part, the first blocking part and the second blocking part are arranged vertically, the first blocking part and the second blocking part are respectively arranged corresponding to the air inlet end of the reverse air outlet pipe and the air hole, the top of the air outlet plate body is provided with a movable groove, one end of the movable rod is provided outside the air outlet plate body, and the other end is movably inserted through the movable groove and connected to the movable baffle, the movable rod is moved to drive the first blocking part and the second blocking part to move within the air outlet plate body.

[0011] Furthermore, the second shielding part is foldable.

[0012] Furthermore, the air outlet plate body has two movable slots, which are symmetrically arranged along the length of the air outlet plate body. There are also two movable rods and two movable baffles, with one movable rod and one movable baffle corresponding to one movable slot.

[0013] Furthermore, the air outlet mechanism also includes a waste collection trough, which is located below the mesh cover.

[0014] Compared with the prior art, the technical solution provided in this application has the following advantages: By setting a detachable mesh cover on the surface of the air outlet plate, this application can effectively block larger debris from entering the air holes, prevent air hole blockage, ensure the normal operation of the air outlet plate, and improve the debris cleaning effect. The mesh cover adopts a detachable design, so when a lot of debris accumulates on the mesh cover, it can be easily removed for cleaning, and then reinstalled after cleaning. The operation is simple and quick, reducing equipment maintenance costs and downtime. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a circuit board drilling positioning device according to an embodiment of the present application; Figure 2 This is a schematic diagram of the air outlet mechanism in one embodiment of the circuit board drilling positioning device of this application; Figure 3 This is a schematic diagram of the air outlet mechanism from another perspective in one embodiment of the circuit board drilling positioning device of this application. Figure 4 This is an exploded structural diagram of the air outlet mechanism in one embodiment of the circuit board drilling positioning device of this application; Figure 5 This is a cross-sectional structural schematic diagram of the air outlet mechanism in one state in another embodiment of the circuit board drilling positioning device of this application. Figure 6 This is a cross-sectional structural schematic diagram of another state of the air outlet mechanism in another embodiment of the circuit board drilling positioning device of this application; Figure 7 This is a schematic diagram of another embodiment of the air outlet mechanism in the circuit board drilling positioning device of this application.

[0018] Figure label: 1. A circuit board drilling and positioning device; 10. Base; 20. Drilling mechanism; 21. Placement frame; 23. Drill head; 30. Positioning mechanism; 40. Air outlet mechanism; 41. Air pump; 42. Air outlet plate body; 421. Air hole; 422. Mounting flange; 4221. Mounting hole; 423. Reverse air outlet pipe; 424. Movable baffle; 4241. First shielding part; 4242. Second shielding part; 425. Movable rod; 426. Movable groove; 43. Mesh cover; 431. Connecting part; 432. Fastener; 44. Waste collection trough. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] like Figure 1 - Figure 3 As shown, the circuit board drilling positioning device 1 provided in this application includes: Base 10; A drilling mechanism 20, comprising a mounting frame 21 and a movable drill head 23, wherein the mounting frame 21 is connected to the base 10 and the drill head 23 is disposed above the mounting frame 21; Positioning mechanism 30, which is connected to the placement frame 21, is used to fix the circuit board; The air outlet mechanism 40 includes an air pump 41, an air outlet plate body 42, and a mesh cover 43. The air pump 41 is fixedly installed on the side of the placement rack 21. The air outlet plate body 42 is connected to the side of the placement rack 21 near the positioning mechanism 30. The air outlet plate body 42 has a plurality of air holes 421, which are arranged facing the positioning mechanism 30. The mesh cover 43 is detachably connected to the placement rack 21 and covers the air holes 421.

[0022] The base 10 supports the overall structure, the drilling mechanism 20 performs the drilling function, the positioning mechanism 30 fixes the circuit board, and the air outlet mechanism 40 cleans up debris. These four modules work together to form a complete workflow from positioning to drilling to cleaning, ensuring the continuity and efficiency of circuit board drilling. This is based on the functional description and connection relationship of each module. For example, the placement frame 21 connects to the base 10 and supports the drill head 23, the positioning mechanism 30 is fixed to the placement frame 21, and the positions of the air pump 41, the air outlet plate body 42, and the mesh cover 43 of the air outlet mechanism 40 are all arranged around the positioning mechanism 30.

[0023] In the air outlet mechanism 40, the mesh cover 43 covers the air holes 421 and is detachably connected. This design effectively prevents larger debris from entering the air holes 421, thus preventing clogging. When debris accumulates on the mesh cover 43, it can be disassembled for cleaning, ensuring the normal operation of the air outlet plate body 42 and improving the debris cleaning effect. This is based on the covering and detachable connection of the mesh cover 43, as well as the layout of the air holes 421 facing the positioning mechanism 30, allowing the airflow to be directly blown towards the debris-generating area, while the mesh cover 43 acts as a filter.

[0024] Furthermore, such as Figure 4 As shown, the air outlet plate body 42 has a mounting flange 422 on its side, and the mounting flange 422 has a mounting hole 4221. The edge of the mesh cover 43 is provided with a connecting part 431 that cooperates with the mounting flange 422. A fastener 432 is installed on the connecting part 431. The mesh cover 43 is fixed to the air outlet plate body 42 by the fastener 432 passing through the mounting hole 4221.

[0025] The mounting flange 422 and mounting hole 4221 on the side of the air outlet plate body 42 form a stable mechanical connection structure with the connecting part 431 and fastener 432 on the edge of the mesh cover 43. By using the fastener 432 through the mounting hole 4221 and connecting hole, the mesh cover 43 can be firmly fixed to the air outlet plate body 42, ensuring that it will not fall off due to airflow impact or vibration during use. When cleaning the mesh cover 43, simply loosen the fastener 432 to remove it; the operation is simple and quick. Based on the specific structural description and matching relationship of the mounting flange 422, mounting hole 4221, connecting part 431, and fastener 432, this design conforms to the principle of mechanical connection reliability while also taking into account the convenience of disassembly.

[0026] The detachable connection makes cleaning the mesh cover 43 easy, eliminating the need to disassemble the entire air outlet mechanism 40, thus reducing maintenance workload and downtime. This is crucial for the continuous operation of the production line, effectively improving equipment utilization and production efficiency. This is based on the design purpose of the connection structure, which is to solve the problem of frequent maintenance due to clogging of the existing air outlet plate vents 421, shortening maintenance time through convenient disassembly.

[0027] Furthermore, the mesh cover 43 is made of stainless steel.

[0028] Stainless steel possesses excellent corrosion resistance, resisting the erosion of cutting fluid, oil, and other substances that may be generated during circuit board drilling, thus extending the service life of the mesh cover 43. Simultaneously, stainless steel has high strength and hardness, capable of withstanding the impact of airflow and the collision of debris, and is not easily deformed or damaged, ensuring that the mesh cover 43 stably and effectively blocks debris over a long period. This choice of material is based on the physical and chemical properties of stainless steel, as well as the corrosive substances and mechanical forces present in the circuit board drilling environment, enabling it to adapt to harsh working conditions.

[0029] Because the stainless steel mesh cover 43 is not easily damaged or corroded, the frequency of replacing the mesh cover 43 is reduced, thereby lowering equipment maintenance costs. At the same time, the smooth surface of stainless steel does not easily accumulate debris and is easy to clean, further improving maintenance efficiency. This is based on the reduced replacement frequency and ease of cleaning resulting from the material's durability, which aligns with the technical objective of reducing maintenance costs.

[0030] Furthermore, the mesh size of the mesh cover 43 is smaller than the aperture of the air hole 421.

[0031] The mesh size of the mesh cover 43 is smaller than the aperture of the air vent 421, effectively blocking larger debris from entering the air vent 421 and preventing clogging. At the same time, the mesh size design does not excessively obstruct gas flow, ensuring that the air outlet plate body 42 can generate sufficient airflow to blow away debris. This size matching satisfies the anti-clogging requirement while ensuring the working efficiency of the air outlet plate body 42, achieving functional optimization. This is based on the filtration effect of the mesh and air vent 421 size relationship on airflow and debris. Through reasonable size design, a balance is achieved between the two, ensuring that the air outlet mechanism 40 can effectively clean debris without affecting airflow performance due to the mesh cover 43.

[0032] The unblocked vent 421 maintains a stable airflow, promptly blowing away drilling debris and preventing its accumulation in the working area, thus ensuring the positioning accuracy of the circuit board and the drilling quality. Simultaneously, a stable airflow also helps improve drilling efficiency and reduces processing interruptions or quality issues caused by debris. This is based on the direct impact of the air outlet mechanism 40's function on drilling; a clean working environment is a crucial factor in ensuring processing quality and efficiency.

[0033] Furthermore, the mesh shape of the mesh cover 43 is circular, square, or rhomboid.

[0034] Circular, square, or rhomboid mesh shapes possess different geometric characteristics, enabling them to adapt to the blocking requirements of debris of varying shapes and sizes. For example, circular meshes are simple to manufacture and distribute force evenly; square meshes are more regularly arranged, facilitating the calculation of mesh size and density; and rhomboid meshes may offer advantages in airflow guidance. By selecting an appropriate mesh shape, the blocking effect of the mesh cover 43 on different types of debris can be improved, enhancing the adaptability of the device. This is based on the geometric characteristics of different mesh shapes and their impact on debris blocking and airflow. Choosing a suitable mesh shape, based on the types of debris that may be generated during actual processing, can optimize the performance of the mesh cover 43.

[0035] Circles, squares, and rhombuses are all common geometric shapes. In their manufacturing, mold design and production processes are relatively mature, reducing the manufacturing cost of the mesh cover 43. Furthermore, the arrangement and combination of these mesh shapes follow certain regularities, facilitating standardized production, improving production efficiency, and thus reducing the overall manufacturing cost of the device. This is based on the ease of processing common geometric shapes and the advantages of standardized production, which aligns with the technological requirements of cost reduction and increased production efficiency.

[0036] Furthermore, such as Figure 5 , Figure 6 As shown, the air outlet plate body 42 also includes a reverse air outlet pipe 423 and a movable baffle 424. The air inlet end of the reverse air outlet pipe 423 is connected to the side of the air outlet plate body 42, and the air inlet end extends to the side of the mesh cover 43 opposite to the air outlet plate body 42. The movable baffle 424 is movably disposed inside the air outlet plate body 42 to allow gas to flow to the air hole 421 or the reverse air outlet pipe 423.

[0037] By moving the baffle 424 within the exhaust plate body 42, the gas flow path can be altered, allowing the gas to either flow out from the vent 421 or from the reverse exhaust pipe 423. This design gives the exhaust plate body 42 more functions. For example, when cleaning debris accumulated on the surface of the mesh cover 43, the gas can be switched to the reverse exhaust pipe 423. Airflow is then directed from the side of the mesh cover 43 away from the exhaust plate body 42 towards the mesh cover 43, blowing away the debris and achieving a self-cleaning function for the mesh cover 43. This eliminates the need to disassemble the mesh cover 43, further improving the convenience of equipment maintenance. Based on the structural design and working principle of the reverse exhaust pipe 423 and the moving baffle 424, the movement of the moving baffle 424 can block or open different gas channels, thereby switching the flow direction. This functional expansion meets the needs of the equipment under different operating conditions.

[0038] The gas flow direction switching function allows the gas outlet mechanism 40 to not only clean debris from the circuit board surface but also clean the mesh cover 43, reducing manual maintenance workload and improving the equipment's usability. Simultaneously, this design reflects a degree of intelligent thinking, enabling automatic or manual switching of functions according to different work requirements, thus enhancing the overall performance of the device. This is based on the increased usability resulting from functional expansion and the technological trend of reducing manual intervention and increasing automation.

[0039] Furthermore, such as Figure 5 , Figure 6As shown, the air outlet plate body 42 also includes a movable rod 425, and the movable baffle 424 includes a first blocking part 4241 and a second blocking part 4242. The first blocking part 4241 and the second blocking part 4242 are arranged vertically. The first blocking part 4241 and the second blocking part 4242 are respectively arranged corresponding to the air inlet end of the reverse air outlet pipe 423 and the air hole 421. The top of the air outlet plate body 42 is provided with a movable groove 426. One end of the movable rod 425 is located outside the air outlet plate body 42, and the other end is movably inserted through the movable groove 426 and connected to the movable baffle 424. Moving the movable rod 425 can drive the first blocking part 4241 and the second blocking part 4242 to move within the air outlet plate body 42.

[0040] The connection between the movable rod 425 and the movable baffle 424, and the arrangement of the first blocking part 4241 and the second blocking part 4242 corresponding to the reverse gas outlet pipe 423 and the air hole 421 respectively, enable the movable rod 425 to accurately block or open the corresponding gas passage when it is moved. For example, when the movable rod 425 blocks the air inlet of the reverse gas outlet pipe 423 with the first blocking part 4241, the gas can only flow out from the air hole 421; when the second blocking part 4242 blocks the air hole 421, the gas flows out from the reverse gas outlet pipe 423. This structural design ensures the accuracy of gas flow direction switching, avoids airflow leakage or flow confusion, and ensures that the gas outlet mechanism 40 can work normally in different functional modes. Based on the structural cooperation and working principle of the movable rod 425, the movable baffle 424, the first blocking part 4241 and the second blocking part 4242, precise control of the gas passage is achieved through mechanical connection and positional correspondence. This design conforms to the principle of accuracy in mechanical control.

[0041] The movable lever 425 is located outside the gas outlet plate body 42, allowing operators to easily switch the gas flow direction by moving the lever 425. The operation is simple and intuitive. Furthermore, this mechanical structure design offers high reliability, is less prone to failure, and can operate stably for extended periods, ensuring the stability and reliability of the device during use. This is based on the ease of manual intervention in the operation method and the enhanced reliability resulting from the stability of the mechanical structure, which is crucial for the daily use and maintenance of the equipment.

[0042] Furthermore, such as Figure 5 , Figure 6 As shown, the second shielding part 4242 is foldable.

[0043] The movable lever 425 is located outside the gas outlet plate body 42, allowing operators to easily switch the gas flow direction by moving the lever 425. The operation is simple and intuitive. Furthermore, this mechanical structure design offers high reliability, is less prone to failure, and can operate stably for extended periods, ensuring the stability and reliability of the device during use. This is based on the ease of manual intervention in the operation method and the enhanced reliability resulting from the stability of the mechanical structure, which is crucial for the daily use and maintenance of the equipment.

[0044] The smooth movement of the movable baffle 424 ensures rapid gas flow direction switching, avoiding delays or incomplete switching due to excessive resistance. This is particularly important for applications requiring frequent gas flow direction switching, improving the efficiency of the outlet mechanism 40 and ensuring the stability of the switching process, preventing issues from affecting the normal operation of the device. This is based on reducing the impact of resistance on moving parts, thereby improving the overall efficiency and stability of the mechanism—a common performance enhancement technique in mechanical design.

[0045] When it is necessary to switch the gas flow direction, the operator controls the movable lever 425 to move the movable baffle 424. First, by pushing the movable lever 425, the first blocking part 4241 and the second blocking part 4242 connected to the movable lever 425 begin to move within the gas outlet plate body 42. As the movable lever 425 continues to be pushed, the first blocking part 4241 gradually moves away from the air inlet end of the reverse gas outlet pipe 423, while the second blocking part 4242 simultaneously moves closer to the air hole 421. When the first blocking part 4241 accurately and completely opens the air inlet end of the reverse gas outlet pipe 423, gas flows out from there; at the same time, when the second blocking part 4242 moves to the position of the air hole 421, if it is in a folded state, it will gradually unfold as it moves until it completely covers the air hole 421, thereby realizing the switching process of gas flowing out from the air hole 421 to flowing out from the reverse gas outlet pipe 423. After the gas flow direction is switched, the function of the gas outlet plate body 42 changes. The airflow originally blowing out from the vent 421 to clean debris from the circuit board surface is now blown out through the reverse vent pipe 423. The airflow blows from the side of the mesh cover 43 away from the vent plate body 42 towards the mesh cover 43, effectively blowing off the debris accumulated on the surface of the mesh cover 43, thus achieving the self-cleaning function of the mesh cover 43. In this process, the foldable design of the second shielding part 4242 ensures that the moving baffle 424 can quickly and stably complete the gas flow direction switching action, avoiding switching failure or delay caused by structural obstruction, and greatly improving the working efficiency and stability of the device.

[0046] When it is necessary to switch the gas flow back to the outlet 421, the operator pulls the movable rod 425 in the opposite direction. The second shield 4242 folds again as it moves away from the outlet 421 to facilitate smooth movement. As the movable rod 425 is pulled, the first shield 4241 gradually approaches the air inlet of the reverse outlet pipe 423, while the second shield 4242 gradually moves away from the outlet 421, eventually returning to its initial state. Gas is then blown out of the outlet 421 again to clean debris from the circuit board surface.

[0047] Furthermore, such as Figure 5 , Figure 6 As shown, the number of movable slots 426 on the air outlet plate body 42 is two, and the two movable slots 426 are symmetrically arranged along the length direction of the air outlet plate body 42. The number of movable rods 425 and movable baffles 424 are two, and one movable rod 425 and one movable baffle 424 are respectively provided for one movable slot 426.

[0048] Two movable slots 426 are symmetrically arranged along the length of the air outlet plate body 42. The corresponding two movable rods 425 and movable baffles 424 control the gas channels on both sides, ensuring uniform airflow and pressure on both sides of the air outlet plate body 42. This is particularly important for the large-area air outlet plate body 42, ensuring that debris in the entire working area is blown off evenly, avoiding debris accumulation in some areas due to uneven airflow, and improving the effectiveness and consistency of debris removal. This is based on the application of symmetrical structures in fluid control; symmetrical arrangement balances the fluid parameters on both sides, ensuring airflow uniformity, which conforms to the basic principles of fluid mechanics.

[0049] The arrangement of two movable levers 425 and movable baffles 424 allows for more flexible control of the air outlet plate body 42 along its length, making it suitable for processing circuit boards of different sizes. Simultaneously, the symmetrical structure provides better mechanical balance; when the movable levers 425 are moved, the movable baffles 424 on both sides move synchronously, reducing vibration or deformation caused by uneven force distribution and improving the stability and reliability of the device. This is based on the mechanical balance and control flexibility brought about by the structural symmetry, which can adapt to different working requirements and environments, enhancing the overall performance of the device.

[0050] Furthermore, such as Figure 7 As shown, the air outlet mechanism 40 also includes a waste collection trough 44, which is located below the mesh cover 43.

[0051] The waste collection trough 44 is located below the mesh cover 43. When the airflow blows debris down, the debris falls into the waste collection trough 44, achieving centralized collection of the debris. This prevents debris from scattering to various corners of the work area, maintaining a clean working environment, and also facilitates subsequent unified waste treatment, reducing the workload of waste cleaning. Based on the location and functional description of the waste collection trough 44, its cooperation with the mesh cover 43 and the air outlet plate body 42 forms a complete closed loop for debris cleaning, improving the efficiency of waste treatment from blowing down debris to collecting it.

[0052] Centralized waste collection reduces airborne debris, lowers dust concentration in the work environment, improves environmental friendliness, and protects operator health. Simultaneously, preventing debris accumulation inside equipment or in work areas reduces equipment malfunctions and safety hazards caused by debris, thus improving the safety and reliability of the equipment. This is based on the positive impact of centralized waste collection on the work environment and equipment safety, which aligns with the environmental and safety requirements of modern industrial production.

[0053] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A circuit board drilling positioning device, characterized in that, include: Base; A drilling mechanism, comprising a mounting frame and a movable drill head, wherein the mounting frame is connected to the base and the drill head is positioned above the mounting frame; A positioning mechanism, connected to the placement frame, is used to fix the circuit board; The air outlet mechanism includes an air pump, an air outlet plate body, and a mesh cover. The air pump is fixedly installed on the side of the placement frame. The air outlet plate body is connected to the side of the placement frame near the positioning mechanism. The air outlet plate body has several air holes facing the positioning mechanism. The mesh cover is detachably connected to the placement frame and covers the air holes.

2. The circuit board drilling positioning device according to claim 1, characterized in that, The air outlet plate body has a mounting flange on its side, and the mounting flange has a mounting hole. The edge of the mesh cover has a connecting part that mates with the mounting flange. Fasteners are installed on the connecting part. The mesh cover is fixed to the air outlet plate body by the fasteners passing through the mounting hole.

3. The circuit board drilling positioning device according to claim 1, characterized in that, The mesh cover is made of stainless steel.

4. The circuit board drilling positioning device according to claim 1, characterized in that, The mesh size of the mesh cover is smaller than the aperture of the air pores.

5. A circuit board drilling positioning device according to claim 1, characterized in that, The mesh of the mesh cover is circular, square, or diamond-shaped.

6. The circuit board drilling positioning device according to claim 1, characterized in that, The air outlet plate body also includes a reverse air outlet pipe and a movable baffle. The air inlet end of the reverse air outlet pipe is connected to the side of the air outlet plate body, and the air inlet end extends to the side of the mesh cover away from the air outlet plate body. The movable baffle is movably disposed in the air outlet plate body so that gas can flow to the air hole or the reverse air outlet pipe.

7. A circuit board drilling positioning device according to claim 6, characterized in that, The air outlet plate body also includes a movable rod. The movable baffle includes a first blocking part and a second blocking part, which are arranged vertically. The first blocking part and the second blocking part are respectively arranged corresponding to the air inlet end of the reverse air outlet pipe and the air hole. A movable groove is opened on the top of the air outlet plate body. One end of the movable rod is located outside the air outlet plate body, and the other end is movably inserted through the movable groove and connected to the movable baffle. Moving the movable rod can drive the first blocking part and the second blocking part to move within the air outlet plate body.

8. A circuit board drilling positioning device according to claim 7, characterized in that, The second shielding part is foldable.

9. A circuit board drilling positioning device according to claim 7, characterized in that, The air outlet plate body has two movable slots, which are symmetrically arranged along the length of the air outlet plate body. There are also two movable rods and two movable baffles, with one movable rod and one movable baffle corresponding to one movable slot.

10. A circuit board drilling positioning device according to claim 1, characterized in that, The air outlet mechanism also includes a waste collection trough, which is located below the mesh cover.

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