PCB cleaning apparatus

Abstract

The present application relates to the technical fields of circuit board manufacturing, and especially relates to a PCB cleaning device, which comprises a rack, a swing shaft applied to the rack, a supporting assembly arranged on the rack and used for limiting the PCB, the supporting assembly comprising a supporting frame movably arranged thereon, a cleaning assembly arranged on the swing shaft and used for cleaning the PCB, the cleaning assembly comprising two clamping plates symmetrically arranged on the swing shaft and slidably, an airflow assembly arranged in the clamping plate and used for cleaning the PCB, and a plurality of probes arranged in the clamping plate at equal distances and in a rectangular shape, wherein when the clamping plates move relatively, the probes enter the holes of the PCB according to the diameters of the holes and clean the holes, so that the cleaning quality of the device is further improved and the waste is prevented from being adsorbed during the cleaning, so that the waste cannot be completely cleaned.

Description

Technical Field

[0001] This invention relates to the field of circuit board manufacturing technology, and in particular to a PCB board cleaning device. Background Technology

[0002] In the production of printed circuit boards (PCBs), holes are typically drilled into the boards. During drilling, the high-speed rotating drill bit generates a large amount of metal dust and resin debris due to friction with the substrate. Because of electrostatic adsorption and mechanical compression during drilling, this dust easily adheres to the inner surface of the hole walls, especially in multilayer boards and small-diameter deep holes, where dust retention is particularly problematic. If it is not thoroughly removed before subsequent processes, it will directly lead to poor hole metallization, decreased interlayer connectivity reliability, and even open or short circuit defects.

[0003] Currently, the industry mainly uses high-pressure jetting combined with vacuum adsorption to clean dust from through-holes, creating a through-flow airflow through "blowing from above and suction from below." However, existing equipment generally suffers from the following problems: First, the airflow parameters are fixed and cannot be adaptively adjusted according to the hole size. This results in small holes being incompletely cleaned due to airflow short-circuiting, while large holes have dust residue due to insufficient airflow. Second, continuous airflow is insufficient to break down the fine dust adsorbed by electrostatics on the hole wall surface, especially for holes with a relatively large diameter. The airflow penetration is insufficient, and the blowing and suction airflow easily forms eddies inside the hole, causing dust to stagnate in the middle section of the hole and not be completely discharged, resulting in reduced equipment cleaning efficiency and effectiveness. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a PCB board cleaning device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: Including the frame, and the swing shaft applied on the frame. It also includes a support assembly mounted on the rack for limiting the PCB board, the support assembly including a support frame movably mounted on it; A cleaning assembly for cleaning PCB boards is mounted on a swing axis. The cleaning assembly includes two clamping plates that are slidably and symmetrically mounted on the swing axis. An airflow assembly for cleaning PCB boards is provided inside the clamping plates. The airflow assembly includes multiple probes that are equidistantly and rectangularly slidably mounted inside the clamping plates. When the clamping plates move relative to each other, the probes enter the holes according to the diameter of the holes in the PCB board to clean the holes.

[0006] Preferably, the support assembly further includes two lead screws rotatably mounted on the frame, the two lead screws being connected in a transmission manner, the support frame being threadedly connected to the lead screws, a first gear being installed at the end of one of the lead screws, a drive motor being mounted on the frame, and an intermittent gear and a cam being provided at the output end of the drive motor that intermittently meshes with the first gear.

[0007] Preferably, the cleaning assembly further includes an air supply unit disposed on the frame, and the air supply unit is in communication with the two clamping plates respectively. When the intermittent gear rotates, it intermittently drives the air supply unit to generate airflow.

[0008] Preferably, the air supply unit includes a piston cylinder fixedly mounted on the frame, and the piston cylinder communicates with two clamping plates respectively. A piston rod is slidably mounted inside the piston cylinder, and the end of the piston rod is in contact with a cam. A first spring is sleeved on the cam.

[0009] Preferably, the probe is hollow and open at one end, a second spring is sleeved on the probe, a sealing plate is provided inside the clamping plate that is in movable contact with the end of the probe, and multiple air holes are provided on the probe.

[0010] Preferably, the clamping plate is provided with a flow control component for adjusting the gas flow frequency.

[0011] Preferably, the flow control assembly includes a gas chamber fixedly disposed within a clamping plate, the gas chamber communicating with the top of the clamping plate, an adjusting plate rotatably disposed on the lower side of the gas chamber, and a driving part disposed within the clamping plate for driving the adjusting plate to open intermittently.

[0012] Preferably, the drive unit includes guide rods symmetrically slidably disposed on the clamping plate, and an intermittent rack is fixedly disposed at the end of the guide rod, and a second gear is movably meshed on the rack. The second gear is disposed outside the gas chamber via a rotating shaft, the adjusting plate is fixedly disposed on the rotating shaft, and a return torsion spring is disposed on one side of the rotating shaft.

[0013] Preferably, a porous hydrophobic hollow fiber membrane is provided in the gas chamber, and a sealing sleeve for sealing is provided on the lower side of the clamping plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes multiple independently sliding hollow probes, automatically determining the number of probes entering the hole based on the hole diameter. This achieves adaptive adjustment, increasing the cleaning air volume for larger holes and decreasing it for smaller holes, enabling efficient and precise cleaning of through-holes of different diameters on PCBs. It avoids wasted air or insufficient cleaning. Furthermore, an intermittent rack and pinion drive adjustment plate, combined with a cam-driven piston air supply system, creates high-frequency pulse jets in the airflow entering the probes. This enhances the airflow impact force and effectively removes deposits from the hole walls, significantly improving cleaning effect and efficiency. During the cleaning process, positive pressure jetting and negative pressure suction are respectively set on the upper and lower clamping plates, creating a directional airflow from one end to the other within the hole. This prevents eddies from forming inside the hole, thus avoiding dust retention and achieving thorough, penetrating cleaning of the through-hole. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the front structure proposed in this invention; Figure 2 This is a schematic diagram of the right-side structure proposed in this invention; Figure 3 This is a schematic diagram of the rear structure proposed in this invention; Figure 4 This is a schematic diagram of the internal structure from a local lower viewpoint proposed in this invention; Figure 5 This is a schematic diagram of the partial frontal view cross-sectional structure proposed in this invention; Figure 6 This is a schematic diagram of the partial rear-view cross-sectional structure proposed in this invention; Figure 7 This is a schematic diagram of the internal structure from a partial frontal view proposed in this invention; Figure 8 This is a schematic diagram of the workflow proposed in this invention.

[0016] In the diagram: 1. Frame; 2. Swing shaft; 3. Support assembly; 31. Support frame; 32. Lead screw; 33. First gear; 34. Intermittent gear; 35. Cam; 36. Drive motor; 4. Cleaning assembly; 41. Clamping plate; 42. Air supply unit; 43. First spring; 5. Airflow assembly; 51. Probe; 52. Second spring; 53. Sealing plate; 54. Air hole; 6. Flow control assembly; 61. Gas chamber; 62. Adjusting plate; 63. Second gear; 64. Rack; 65. Guide rod; 7. Porous hydrophobic hollow fiber membrane; 8. Sealing sleeve. Detailed Implementation

[0017] 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.

[0018] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0019] Reference Figures 1-8 A PCB board cleaning device includes a frame 1 and a swing shaft 2 applied on the frame 1. It also includes a support assembly 3 mounted on the rack 1 for limiting the PCB board position. The support assembly 3 includes a support frame 31 movably mounted on the rack. A cleaning assembly 4 for cleaning the PCB board is mounted on the swing shaft 2. The cleaning assembly 4 includes two slidably symmetrically mounted clamping plates 41 on the swing shaft 2. An airflow assembly 5 for cleaning the PCB board is installed within each clamping plate 41. The airflow assembly 5 includes multiple probes 51 equidistantly and rectangularly slidably mounted within the clamping plates 41. When the clamping plates 41 move relative to each other, the probes 51 enter the holes in the PCB board according to their diameter, cleaning the holes. A support frame 31 provides limiting support for the PCB board, allowing it to move between the two clamping plates 41. The relative movement of the two clamping plates 41 is controlled so that they cover the holes in the PCB board. As the two clamping plates 41 move relative to each other, the multiple probes 51 on one of the clamping plates 41 gradually contact one side of the PCB board, and... As the clamping plate 41 descends, some probes 51 will pass through the holes, while the excess probes 51 will rise under pressure. In other words, the number of probes 51 entering the holes matches the diameter of the holes. When the probes 51 enter the holes, gas is ejected through the probes 51 to clean the holes. That is, the more probes 51 enter the holes, the more gas is ejected, and vice versa. This allows the equipment to control the amount of gas used for cleaning according to the diameter of the holes. When the probes 51 descend, the gas will clean the inner diameter of the holes from top to bottom, preventing the airflow from forming eddies on the surface and inside of the plate. This improves the cleaning effect of the equipment and also avoids filamentous foreign objects getting stuck in the holes, which would reduce the cleaning efficiency.

[0020] Preferred, Reference Figure 2 and Figure 3The support assembly 3 also includes two lead screws 32 rotatably mounted on the frame 1. The two lead screws 32 are connected by a transmission, and the support frame 31 is threadedly connected to the lead screws 32. A first gear 33 is installed at the end of one of the lead screws 32. A drive motor 36 is mounted on the frame 1, and the output end of the drive motor 36 is provided with an intermittent gear 34 that intermittently meshes with the first gear 33 and a cam 35. After the plate is placed on the support frame 31, the drive motor 36 is controlled to drive the intermittent gear 34 and the cam 35 to rotate. When the teeth on the intermittent gear 34 mesh with the first gear 33, the first gear 34 will rotate. When wheel 33 engages, it drives screw 32 to rotate, which in turn drives support frame 31 to move. In other words, support frame 31 moves plate to clamping plate 41. By swinging swing shaft 2, the position of clamping plate 41 is adjusted so that the two clamping plates 41 are located on the upper and lower sides of the plate. Finally, by controlling the relative movement of the two clamping plates 41, the plate can be wrapped and cleaned. After cleaning, intermittent gear 34 engages with first gear 33 again, causing screw 32 to rotate continuously, thereby moving the cleaned plate to the outside of frame 1 for further processing.

[0021] Preferred, Reference Figure 3 The cleaning assembly 4 also includes an air supply unit 42 disposed on the frame 1, and the air supply unit 42 is in communication with the two clamping plates 41 respectively. When the intermittent gear 34 rotates, it intermittently drives the air supply unit 42 to generate airflow. When the cam 35 rotates, the cam 35 is provided with multiple protrusions. Therefore, when the protrusions squeeze the air supply unit 42, the air supply unit 42 will generate airflow. The airflow acts on the surface of the plate through the clamping plate 41, thereby thoroughly cleaning the plate.

[0022] Preferred, Reference Figure 2 The air supply unit 42 includes a piston cylinder fixedly mounted on the frame 1, and the piston cylinder is in communication with two clamping plates 41 respectively. A piston rod is slidably mounted inside the piston cylinder, and the end of the piston rod is in contact with the cam 35. A first spring 43 is mounted on the cam 35. Since the cam 35 is provided with multiple protrusions, it will intermittently contact the piston rod. When the piston rod is squeezed, it will form an exhaust and intake situation on the two clamping plates 41. At this time, the gas acts on the surface of the plate, which can form an intake and exhaust effect on the upper and lower sides of the plate hole, reducing the generation of eddies, and effectively cleaning the plate at the same time. The action of the first spring 43 can effectively drive the piston rod to reciprocate.

[0023] Preferred, Reference Figure 6 and Figure 7The probe 51 is hollow and open at one end. A second spring 52 is fitted on the probe 51. A sealing plate 53 is provided inside the clamping plate 41, which is in contact with the end of the probe 51. The probe 51 has multiple air holes 54. When the probe 51 contacts the plate, the probe 51 that enters the plate hole will not be forced to move because the middle of the plate hole is hollow. However, the probe 51 that does not enter the plate hole will move due to the pressure of the plate. When the moving probe 51 contacts the sealing plate 53, the sealing plate 53 can effectively seal the probe 51. The airflow enters the plate hole through the unsealed probe 51. During the movement of the probe 51, the gas enters the probe 51 through the end of the probe 51 and then exits through the air holes 54, forming a path for cleaning the plate hole. The airflow exiting from the air holes 54 is more concentrated and has a greater impact force, thus ensuring the cleaning effect of the plate hole. At the same time, the cleaning airflow can be controlled according to the number of probes 51 entering the plate hole to ensure the cleaning effect of the equipment.

[0024] Preferred, Reference Figure 5 and Figure 6 The clamping plate 41 is equipped with a flow control component 6 for adjusting the gas flow frequency. By opening and closing the flow control component 6, the gas flow is controlled, so that the gas is sprayed intermittently, ensuring the impact effect of the airflow and thus improving the cleaning efficiency of the equipment.

[0025] Preferred, Reference Figure 5 The flow control assembly 6 includes a gas chamber 61 fixedly disposed within the clamping plate 41. The gas chamber 61 communicates with the top of the clamping plate 41. An adjusting plate 62 is rotatably disposed on the lower side of the gas chamber 61. A driving part is disposed within the clamping plate 41 to drive the adjusting plate 62 to open intermittently. Through the intermittent opening of the adjusting plate 62, the airflow is intermittently flowed, so that when it enters the probe 51, it will form an intermittent jet, thereby improving the cleaning efficiency of the equipment and ensuring the cleaning quality of the equipment.

[0026] Preferred, Reference Figure 5The drive unit includes guide rods 65 symmetrically slidably disposed on clamping plates 41, and an intermittent rack 64 fixedly disposed at the end of the guide rods 65. A second gear 63 is movably meshed on the rack 64. The second gear 63 is disposed outside the gas chamber 61 via a rotating shaft. An adjusting plate 62 is fixedly disposed on the rotating shaft, and a return torsion spring is disposed on one side of the rotating shaft. When the two clamping plates 41 move relative to each other, the guide rods 65 on the clamping plates 41 will contact the plates. At this time, the guide rods 65 will move upward. When the guide rods 65 move upward, the rack 64 moves synchronously. Due to the rack 64's... The gear teeth are intermittent, so when the rack 64 drives the second gear 63 to rotate, the adjusting plate 62 will open synchronously. When the second gear 63 disengages from the rack 64, a torsion spring is sleeved on the rotating shaft. One end of the torsion spring is fixed on the rotating shaft, and the other end is fixed on the inner wall of the clamping plate 41. Therefore, the torsion spring will drive the adjusting plate 62 to reverse, so that the adjusting plate 62 seals the gas chamber 61. By repeatedly opening and closing the adjusting plate 62, the gas entering the probe 51 forms an intermittent air intake effect, ensuring the cleaning efficiency of the equipment, while increasing the impact force of the airflow and ensuring the impact cleaning effect of the equipment.

[0027] Preferred, Reference Figure 6 A porous hydrophobic hollow fiber membrane 7 is provided inside the gas chamber 61. A sealing sleeve 8 is provided on the lower side of the clamping plate 41 for sealing. When the clamping plate 41 is in contact with the plate, the sealing sleeve 8 can effectively seal the bottom of the clamping plate 41, ensuring the sealing effect between the clamping plate 41 and the plate. At the same time, when the airflow passes through the porous hydrophobic hollow fiber membrane 7, the porous hydrophobic hollow fiber membrane 7 can effectively wet the gas, so that the gas sprayed by the probe 51 is a humid gas. The humid gas can effectively eliminate static electricity and prevent the powder from adhering to the plate hole due to static electricity, which would prevent it from being fully cleaned. Working principle The PCB board to be cleaned is placed on the support frame 31. The drive motor 36 starts, driving the intermittent gear 34 and cam 35 to rotate synchronously. When the teeth of the intermittent gear 34 mesh with the first gear 33, the drive screw 32 rotates, causing the support frame 31 and the PCB board on it to move towards the clamping plate 41 until the board is located between the upper and lower clamping plates 41. Subsequently, the swing shaft 2 drives the two clamping plates 41 to move relative to each other, so that the sealing sleeve 8 at the bottom of the clamping plate 41 fits tightly against the surface of the PCB board, forming a sealed space.

[0028] The clamping plates 41 continue to move towards each other, with multiple probes 51 on them contacting the PCB board surface. When a probe 51 aligns with a hole, it smoothly enters the hole; probes 51 that are not aligned with the hole are pushed up by the PCB board surface, overcoming the elastic force of the second spring 52, and slide upwards until their ends contact the sealing plate 53 inside the clamping plate 41, thus sealing the air passage of that probe 51. The number of probes 51 entering the hole is directly proportional to the hole diameter: the larger the hole, the more probes 51 enter, and the more probes 51 can be cleaned with air jets; the smaller the hole, the fewer probes 51 enter, and the air jet volume decreases accordingly.

[0029] As the clamping plates 41 move towards each other, the guide rod 65 contacts the edge of the PCB board and is pushed upwards. The guide rod 65 drives the intermittent rack 64 to move upwards, and the intermittent rack 64 drives the second gear 63, which meshes with it, to rotate intermittently. The second gear 63 drives the adjusting plate 62 to intermittently open and close the gas chamber 61 via a rotating shaft. When the rack 64 disengages, the reset torsion spring drives the adjusting plate 62 to reset and close, so that the airflow in the gas chamber 61 enters the probe 51 in a pulse.

[0030] When the cam 35 rotates, its multiple protrusions intermittently squeeze the piston rod, pushing it to reciprocate within the piston cylinder. This reciprocating motion causes the piston cylinder to alternately generate positive and negative pressure, which is transmitted through pipes to the gas chambers 61 within the two clamping plates 41. Positive pressure gas passes through the gas chamber 61, the open regulating plate 62, and the porous hydrophobic hollow fiber membrane 7 (wetting gas to eliminate static electricity) into the unsealed probe 51. It enters from the end of the probe 51 and exits through the side wall vents 54, performing high-pressure pulse purging on the inner wall of the hole. Simultaneously, under negative pressure, the other clamping plate 41 draws in dust and impurities from the other end of the hole through its probe 51, creating a coordinated upward and downward convection cleaning effect that effectively prevents eddy currents.

[0031] After cleaning, the intermittent gear 34 meshes with the first gear 33 again, driving the lead screw 32 to continue rotating, so that the support frame 31 moves the cleaned PCB board out of the clamping plate 41 area and enters the next process. Beneficial effects This invention utilizes multiple independently sliding hollow probes 51, automatically determining the number of probes 51 entering the hole based on the hole diameter. This achieves adaptive adjustment, where larger holes require more cleaning air and smaller holes require less, enabling efficient and precise cleaning of through-holes of different diameters on PCBs. This avoids wasted air or insufficient cleaning. Simultaneously, an intermittent rack and pinion 64 and gear-driven adjustment plate 62 are used to intermittently open and close, in conjunction with a piston air supply system driven by a cam 35. This creates a high-frequency pulse jet of airflow entering the probes 51, increasing the airflow impact force and effectively removing deposits from the hole walls, significantly improving cleaning effect and efficiency. During the cleaning process, positive pressure jetting and negative pressure suction are respectively set on the upper and lower clamping plates 41, forming a directional airflow from one end to the other within the hole. This prevents eddies from forming inside the hole, thus avoiding dust retention and achieving thorough, penetrating cleaning of the through-hole.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A PCB board cleaning device, comprising a frame (1) and a swing shaft (2) applied on the frame (1): characterized in that, It also includes a support assembly (3) disposed on the frame (1) for limiting the PCB board, the support assembly (3) including a support frame (31) movably disposed on it. A cleaning assembly (4) for cleaning PCB boards is set on the swing shaft (2). The cleaning assembly (4) includes two clamping plates (41) slidably and symmetrically arranged on the swing shaft (2). An airflow assembly (5) for cleaning PCB boards is set inside the clamping plates (41). The airflow assembly (5) includes multiple probes (51) equidistantly and rectangularly slidably arranged inside the clamping plates (41). When the clamping plates (41) move relative to each other, the probes (51) enter the holes according to the diameter of the holes in the PCB board and clean the holes.

2. The PCB board cleaning equipment according to claim 1, characterized in that, The support assembly (3) also includes two lead screws (32) rotatably mounted on the frame (1), the two lead screws (32) being connected in a transmission manner, the support frame (31) being threadedly connected to the lead screws (32), a first gear (33) being installed at the end of one of the lead screws (32), a drive motor (36) being installed on the frame (1), and an intermittent gear (34) being provided at the output end of the drive motor (36) intermittently meshing with the first gear (33) and a cam (35).

3. The PCB board cleaning equipment according to claim 2, characterized in that, The cleaning assembly (4) also includes an air supply unit (42) disposed on the frame (1), and the air supply unit (42) is in communication with the two clamping plates (41) respectively. When the intermittent gear (34) rotates, it intermittently drives the air supply unit (42) to generate airflow.

4. The PCB board cleaning equipment according to claim 3, characterized in that, The air supply unit (42) includes a piston cylinder fixedly mounted on the frame (1), and the piston cylinder is in communication with two clamping plates (41) respectively. A piston rod is slidably mounted inside the piston cylinder, and the end of the piston rod is in contact with the cam (35). A first spring (43) is mounted on the cam (35).

5. A PCB board cleaning device according to claim 4, characterized in that, The probe (51) is hollow and has an open end. A second spring (52) is fitted on the probe (51). A sealing plate (53) is provided inside the clamping plate (41) and is in contact with the end of the probe (51). Multiple air holes (54) are provided on the probe (51).

6. The PCB board cleaning equipment according to claim 5, characterized in that, The clamping plate (41) is provided with a flow control component (6) for adjusting the gas flow frequency.

7. A PCB board cleaning device according to claim 6, characterized in that, The flow control assembly (6) includes a gas chamber (61) fixedly disposed in the clamping plate (41). The gas chamber (61) is connected to the top of the clamping plate (41). An adjustment plate (62) is rotatably disposed on the lower side of the gas chamber (61). A driving part is disposed in the clamping plate (41) for driving the adjustment plate (62) to open intermittently.

8. A PCB board cleaning device according to claim 7, characterized in that, The drive unit includes a guide rod (65) symmetrically slidably disposed on the clamping plate (41), and an intermittent rack (64) is fixedly disposed at the end of the guide rod (65), and a second gear (63) is movably meshed on the rack (64). The second gear (63) is disposed outside the gas chamber (61) through a rotating shaft. The adjusting plate (62) is fixedly disposed on the rotating shaft, and a reset torsion spring is disposed on one side of the rotating shaft.

9. A PCB board cleaning device according to claim 8, characterized in that, A porous hydrophobic hollow fiber membrane (7) is provided inside the gas chamber (61), and a sealing sleeve (8) for sealing is provided on the lower side of the clamping plate (41).

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