Printed circuit board surface treatment equipment and treatment method

Abstract

The invention provides printed circuit board surface treatment equipment and a treatment method. The equipment comprises a mounting frame, a conveying assembly, a lifting adjusting part and a cleaning part, the conveying assembly is installed on the installation frame and used for conveying the printed circuit boards to the position below the cleaning piece one by one. The lifting adjusting part is mounted at the top of the mounting frame, and is used for adjusting the height of the cleaning part and driving the cleaning part to be in contact with the printed circuit board located below the cleaning part for cleaning and drying; the cleaning part is fixedly arranged on the lifting adjusting part, and the cleaning part is used for carrying out oil stain cleaning on the printed circuit board and carrying out air flow drying after oil stain cleaning. The cleaning and drying device can clean and dry the printed circuit boards one by one, oil stains on the surfaces of the printed circuit boards can be comprehensively cleaned and removed, the subsequent anti-corrosion process of the printed circuit boards can be smoothly carried out, and the cleaning and drying device has the advantages of being simple in structure and convenient and fast to operate.

Description

Technical Field

[0001] This invention relates to the field of circuit board surface treatment technology, and specifically to a printed circuit board surface treatment device and method. Background Technology

[0002] After circuit board manufacturing, copper pads and traces are highly susceptible to oxidation in air, forming a non-conductive or difficult-to-solder oxide layer. This severely impacts the soldering quality of subsequent components and the reliability of the circuit board. Therefore, surface treatment is a crucial step in PCB manufacturing. Its main purpose is to cover the exposed copper surface with a protective coating or metal layer, serving multiple functions: preventing copper oxidation and corrosion, ensuring the pads remain fresh and solderable before soldering; providing good solderability, allowing molten solder to effectively wet the pads and form strong and reliable solder joints; and for certain processes, providing excellent electrical contact performance and abrasion resistance. Furthermore, it protects the pads from environmental factors for a certain period.

[0003] Currently, there are several mainstream surface treatment processes, each with its unique characteristics and applicable scenarios. Among them, organic solderability preservative (OSP) is an environmentally friendly and economical process. It coats a very thin organic protective film (usually based on benzimidazole compounds) onto a clean copper surface. This film can isolate air and prevent oxidation at room temperature, while it can rapidly decompose at the high temperatures of soldering, allowing molten solder to directly bond with the underlying clean copper. OSP offers excellent surface smoothness, simple process, low cost, and is environmentally friendly with no heavy metals. Its disadvantages include a transparent protective film that is difficult to detect, a relatively short protection period, limited heat resistance, and solder joint strength that directly depends on the copper substrate itself.

[0004] However, when applying organic solderable protective agents to printed circuit boards, the presence of oil on the surface of the printed circuit board can easily cause the coating of the organic solderable protective agent film to fail, affecting subsequent soldering operations of the printed circuit board, which is a certain defect.

[0005] In view of the above, this application is hereby submitted. Summary of the Invention

[0006] The purpose of this invention is to provide a surface treatment device and method for printed circuit boards to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0008] Embodiments of the present invention provide a surface treatment device for printed circuit boards, including a mounting frame, a conveying assembly, a lifting adjustment component, and a cleaning component;

[0009] The conveying assembly is mounted on the mounting frame and is used to convey printed circuit boards one by one to the area below the cleaning component.

[0010] The lifting adjustment component is installed on the top of the mounting frame. The lifting adjustment component is used to adjust the height of the cleaning component and drive the cleaning component to contact the printed circuit board located below it for cleaning and drying.

[0011] The cleaning component is fixedly mounted on the lifting adjustment component. The cleaning component is used to clean oil stains from the printed circuit board and to perform airflow drying after the oil stains are cleaned.

[0012] Furthermore, the conveying assembly includes a conveyor frame, a transmission roller, a transmission conveyor bar, and a drive motor;

[0013] Two conveyor frames are arranged in parallel, and the two conveyor frames are fixedly mounted on the mounting frame;

[0014] The transmission rollers are provided in two parts, and the two transmission rollers are respectively rotatably mounted at both ends of the conveyor frame. The cross-section of the transmission rollers is a regular polygon.

[0015] The transmission conveyor bar is connected to the two transmission rollers, and the transmission conveyor bar is used to convey printed circuit boards one by one;

[0016] The drive motor is fixedly installed on the side of the conveyor frame, and the drive motor is connected to one of the transmission rollers.

[0017] Furthermore, the transmission conveyor bar includes a connecting bar and a connecting shaft;

[0018] The connecting strips are arranged in multiple sets in parallel, and each set of the connecting strips can be detachably provided with a carrier frame, and the carrier frame is used to install the printed circuit board to be cleaned.

[0019] The connecting shaft is disposed between two adjacent sets of connecting strips, and the connecting shaft is rotatably connected to the two adjacent sets of connecting strips.

[0020] Furthermore, the load-bearing space frame includes a supporting space frame, a connecting frame, and a connecting knob;

[0021] The connecting frame is disposed at both ends of the supporting grid frame. The connecting frame has an inverted "U" shaped structure and is sleeved on the connecting strip.

[0022] The connecting knob is disposed on the connecting frame and is used for threaded connection with the connecting strip.

[0023] Furthermore, the lifting adjustment component includes a drive bar, an adjustment screw, a mounting platform, and an adjustment motor;

[0024] Two drive bars are symmetrically arranged, and the two drive bars are slidably disposed on the top of the mounting frame;

[0025] The adjusting screw is rotatably mounted on the mounting bracket, and the adjusting screw is threadedly connected to the drive bar;

[0026] The mounting platform is movably connected to the two drive bars via a connecting rod, and the mounting platform is adjusted in height by opening and closing the connecting rod;

[0027] The adjusting motor is fixedly mounted on the mounting bracket, and the adjusting motor is connected to the adjusting lead screw via a transmission.

[0028] Furthermore, the regulating motor is a servo motor.

[0029] Furthermore, a splash guard is fixedly provided on the edge of the mounting platform, and the splash guard has an openable window.

[0030] Furthermore, the cleaning component includes an installation pipe, a water storage tank, a rotating panel, and a cleaning brush;

[0031] The installation pipe is fixedly mounted on the installation platform;

[0032] The water storage cylinder is fixedly installed at the end of the installation pipe, and the water storage cylinder is connected to the installation pipe;

[0033] The rotating panel is rotatably mounted on the water storage tank, and the rotating panel is provided with a fluid drive channel. The rotating panel rotates by water flow or air flow.

[0034] The cleaning brush is mounted on the rotating panel and is used to clean the surface of the printed circuit board.

[0035] Furthermore, multiple fluid drive channels are provided, and the fluid drive channels are evenly distributed circumferentially on the rotating panel, and the fluid drive channels are arranged in an inclined manner.

[0036] This invention also discloses a method for surface treatment of printed circuit boards, employing the aforementioned surface treatment equipment for printed circuit boards, comprising:

[0037] Loading: Place the printed circuit board to be cleaned onto the support frame and use the conveyor assembly to transport the printed circuit board to be cleaned to the bottom of the cleaning unit;

[0038] Cleaning: Cleaning fluid is introduced into the installation pipe. The rotating panel is driven to rotate under the impact of the flowing cleaning fluid, and the printed circuit board to be cleaned is cleaned using a cleaning brush.

[0039] Drying: Lift the rotating panel and introduce high-pressure airflow into the installation pipe. Use the high-pressure airflow to drive the rotating panel to rotate and perform airflow drying on the printed circuit board to be dried.

[0040] Feeding: The cleaned and dried printed circuit boards are transported to the outside of the splash guard using the conveyor assembly, while the inside of the splash guard is loaded.

[0041] The above solution of the present invention includes at least the following beneficial effects:

[0042] This invention utilizes a conveying assembly to transport printed circuit boards one by one to a cleaning unit, and coordinates with a lifting adjustment component to adjust the height of the cleaning unit, thereby achieving the cleaning operation of the printed circuit boards. Simultaneously, after the printed circuit boards are cleaned, the cleaning solution on the boards can be dried by airflow, reducing water stains left on the boards and facilitating the uniform coating of subsequent organic solderable protective films, thus improving the surface treatment quality of the printed circuit boards.

[0043] Furthermore, the printed circuit boards are conveyed one by one, and with the help of lifting and adjusting components and cleaning components, continuous cleaning and drying operations of the printed circuit boards can be achieved, which greatly improves the cleaning efficiency of the printed circuit boards. Attached Figure Description

[0044] Figure 1 A schematic diagram of the overall structure of a printed circuit board surface treatment device provided by the present invention;

[0045] Figure 2 A bottom view of the structure of a printed circuit board surface treatment device provided by the present invention;

[0046] Figure 3 A schematic diagram of the transmission conveyor bar structure of a printed circuit board surface treatment device provided by the present invention;

[0047] Figure 4 A schematic diagram of the cleaning component structure of a printed circuit board surface treatment device provided by the present invention;

[0048] Figure 5 This is a flowchart of a printed circuit board surface treatment method provided by the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Mounting frame; 2. Conveyor frame; 3. Drive roller; 4. Drive conveyor bar; 5. Drive motor; 6. Connecting bar; 7. Connecting shaft; 8. Bearing frame; 9. Support frame; 10. Connecting frame; 11. Connecting knob; 12. Drive bar; 13. Adjusting screw; 14. Mounting platform; 15. Adjusting motor; 16. Connecting rod; 17. Anti-splash frame; 18. Mounting pipe; 19. Water storage tank; 20. Rotating panel; 21. Cleaning brush; 22. Fluid drive channel. Detailed Implementation

[0051] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0052] Example 1:

[0053] like Figures 1 to 4 As shown, an embodiment of the present invention provides a surface treatment device for printed circuit boards, including a mounting frame 1, a conveying assembly, a lifting adjustment component, and a cleaning component.

[0054] Specifically, the conveying assembly is mounted on the mounting frame 1, and the conveying assembly is used to convey printed circuit boards one by one to the area below the cleaning component.

[0055] The lifting adjustment component is installed on the top of the mounting bracket 1. The lifting adjustment component is used to adjust the height of the cleaning component and drive the cleaning component to contact the printed circuit board located below it for cleaning and drying.

[0056] The cleaning component is fixedly mounted on the lifting adjustment component. The cleaning component is used to clean oil stains from the printed circuit board and to perform airflow drying after the oil stains are cleaned.

[0057] In this embodiment, the printed circuit boards (PCBs) to be cleaned are placed on the conveying assembly and conveyed one by one to the area below the cleaning unit. Then, the lifting adjustment unit adjusts the height of the cleaning unit so that the cleaning end of the cleaning unit contacts the surface of the PCBs to be cleaned. Subsequently, the cleaning unit cleans the surface of the PCBs to be cleaned, and after cleaning, the surface of the PCBs is dried with airflow, effectively reducing the formation of water stains on the PCB surface. Finally, the conveying assembly continues to convey the PCBs to be cleaned below the cleaning unit, while simultaneously outputting the cleaned PCBs.

[0058] It should be noted that the surface treatment equipment is suitable for cleaning and removing oil stains from single-sided printed circuit boards. When performing the oil stain cleaning and removal operation, the cleaning surface of the printed circuit board should face the part to be cleaned.

[0059] Furthermore, the conveying assembly includes a conveyor frame 2, a transmission roller 3, a transmission conveyor bar 4, and a drive motor 5.

[0060] Specifically, there are two conveyor frames 2 arranged in parallel, and the two conveyor frames 2 are fixedly mounted on the mounting frame 1.

[0061] Two drive rollers 3 are provided, and the two drive rollers 3 are respectively rotatably disposed at both ends of the conveyor frame 2. The cross-section of the drive rollers 3 is a regular polygon.

[0062] The transmission conveyor bar 4 is connected to the two transmission rollers 3, and the transmission conveyor bar 4 is used to convey printed circuit boards one by one.

[0063] The drive motor 5 is fixedly installed on the side of the conveyor frame 2, and the drive motor 5 is connected to one of the transmission rollers 3.

[0064] The transmission conveyor bar 4 includes connecting bars 6 and connecting shafts 7. Multiple sets of connecting bars 6 are arranged in parallel, and each set of connecting bars 6 is detachably equipped with a support frame 8, which is used to mount the printed circuit board to be cleaned. The connecting shaft 7 is located between two adjacent sets of connecting bars 6 and is rotatably connected to the two adjacent sets of connecting bars 6.

[0065] When cleaning printed circuit boards, the printed circuit boards to be cleaned are placed in the carrier frame 8. Then, driven by the drive motor 5, the printed circuit boards located in the carrier frame 8 are transported one by one to the bottom of the cleaning unit. With the help of the lifting adjustment component, the cleaning and drying operation of the printed circuit boards to be cleaned can be realized, which greatly improves the cleaning quality and cleaning efficiency of the printed circuit boards.

[0066] In one specific embodiment, the supporting space frame 8 includes a supporting space frame 9, a connecting frame 10, and a connecting knob 11. The connecting frame 10 is disposed at both ends of the supporting space frame 9, and the connecting frame 10 has an inverted "U" shape structure, and the connecting frame 10 is sleeved on the connecting strip 6. The connecting knob 11 is disposed on the connecting frame 10, and the connecting knob 11 is used for threaded connection with the connecting strip 6.

[0067] For printed circuit boards of different sizes and specifications, a matching support frame 9 can be selected. Then, the connecting frame 10 at the end of the support frame 9 is fitted onto the connecting strip 6, and the connecting knob 11 is used to tighten and fix the connecting frame 10 to complete the installation of the load-bearing frame 8.

[0068] Furthermore, the lifting adjustment component includes a drive bar 12, an adjusting screw 13, a mounting platform 14, and an adjusting motor 15.

[0069] Specifically, two drive bars 12 are symmetrically arranged, and the two drive bars 12 are slidably disposed on the top of the mounting bracket 1.

[0070] The adjusting screw 13 is rotatably mounted on the mounting bracket 1, and the adjusting screw 13 is threadedly connected to the drive bar 12.

[0071] The mounting platform 14 is movably connected to the two drive bars 12 via a connecting rod 16, and the mounting platform 14 is adjusted in height by opening and closing the connecting rod 16.

[0072] The adjusting motor 15 is fixedly installed on the mounting bracket 1, and the adjusting motor 15 is connected to the adjusting lead screw 13 through a worm gear transmission.

[0073] In this embodiment, the adjusting screw 13 is a synchronous screw. The threads at both ends of the synchronous screw turn in opposite directions, which can drive the drive bar to synchronously close or separate. When the height of the cleaning component needs to be adjusted, the adjusting motor 15 is turned on, and the adjusting screw 13 rotates together with the adjusting motor 15 under the drive of the adjusting motor 15. However, the drive bar 12, which is threadedly connected to the adjusting screw 13, cannot rotate with the adjusting screw 13 due to the restriction of the mounting bracket 1; the drive bar 12 can only close or separate along the length direction of the adjusting screw 13.

[0074] When the two drive bars 12 are closed, the angle between the connecting rod 16 and the vertical plane decreases, and the mounting platform 14 moves downward. When the two drive bars 12 are separated, the angle between the connecting rod 16 and the vertical plane increases, and the mounting platform 14 moves upward. These two actions work together to adjust the height of the cleaning component. The lifting and lowering of the cleaning component is controlled by adjusting the forward or reverse rotation of the motor 15.

[0075] In one specific embodiment, the adjusting motor 15 is a servo motor. The servo motor 15 allows for precise adjustment of the height of the cleaning component. Simultaneously, the self-locking action of the worm gear ensures the cleaning component is stably maintained at the adjusted height, thereby enabling stable cleaning of the printed circuit board.

[0076] In addition, a splash guard 17 is fixedly provided on the edge of the mounting platform 14, and the splash guard 17 has an openable window. When the mounting platform 14 is lowered to the cleaning state, the splash guard 17 can form a barrier around the printed circuit board to be cleaned, reducing the splashing of cleaning fluid.

[0077] Furthermore, the cleaning component includes an installation pipe 18, a water storage tank 19, a rotating panel 20, and a cleaning brush 21.

[0078] Specifically, the installation pipe 18 is fixedly installed on the mounting platform 14.

[0079] The water storage cylinder 19 is fixedly installed at the end of the installation pipe 18, and the water storage cylinder 19 is connected to the installation pipe 18.

[0080] The rotating panel 20 is rotatably mounted on the water storage cylinder 19, and the rotating panel 20 is provided with a fluid drive channel 22. The rotating panel 20 rotates by water flow or air flow.

[0081] The cleaning brush 21 is mounted on the rotating panel 20 and is used to clean the surface of the printed circuit board.

[0082] In this embodiment, multiple fluid drive channels 22 are provided, and the fluid drive channels 22 are evenly distributed on the rotating panel 20 in a circular manner, and the fluid drive channels 22 are arranged in an inclined manner.

[0083] During the cleaning process, when the cleaning fluid flows out from the fluid drive channel 22, the thrust generated by the cleaning flow drives the rotating panel 20 to rotate. During this process, the cleaning fluid is sprayed onto the printed circuit board in a spiral shape, and at the same time, the cleaning brush 21 can effectively clean and remove oil stains from the surface of the printed circuit board.

[0084] After the printed circuit board is cleaned, airflow is introduced through the installation pipe 18 to remove the residual cleaning solution on the printed circuit board, reducing the formation of water stains on the printed circuit board and ensuring the quality of the circuit board surface treatment.

[0085] Example 2:

[0086] like Figure 5 As shown, the present invention also discloses a method for surface treatment of printed circuit boards, employing the aforementioned surface treatment equipment for printed circuit boards, comprising:

[0087] Loading: Place the printed circuit board to be cleaned onto the carrier frame 8, and use the conveying assembly to transport the printed circuit board to be cleaned to the bottom of the cleaning part;

[0088] Cleaning: Cleaning fluid is introduced into the installation pipe 18. The rotating panel 20 is driven to rotate under the impact of the flowing cleaning fluid, and the printed circuit board to be cleaned is cleaned by the cleaning brush 21.

[0089] Drying: Lift the rotating panel 20 and introduce high-pressure airflow into the mounting pipe 18. Use the high-pressure airflow to drive the rotating panel 20 to rotate and perform airflow drying on the printed circuit board to be dried.

[0090] Feeding: The cleaned and dried printed circuit boards are transported to the outside of the splash guard 17 using the conveying assembly, while the inside of the splash guard 17 is loaded.

[0091] Unlike existing technologies, the present invention has at least the following beneficial effects:

[0092] This invention utilizes a conveying assembly to transport printed circuit boards one by one to a cleaning unit, and coordinates with a lifting adjustment component to adjust the height of the cleaning unit, thereby achieving the cleaning operation of the printed circuit boards. Simultaneously, after the printed circuit boards are cleaned, the cleaning solution on the boards can be dried by airflow, reducing water stains left on the boards and facilitating the uniform coating of subsequent organic solderable protective films, thus improving the surface treatment quality of the printed circuit boards.

[0093] Furthermore, the printed circuit boards are conveyed one by one, and with the help of lifting and adjusting components and cleaning components, continuous cleaning and drying operations of the printed circuit boards can be achieved, which greatly improves the cleaning efficiency of the printed circuit boards.

[0094] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A surface treatment device for printed circuit boards, characterized in that: It includes a mounting frame, a conveying component, a lifting adjustment component and a cleaning component; The conveying component is installed on the mounting frame, and the conveying component is used to convey printed circuit boards one by one under the cleaning component; The lifting adjustment component is installed on the top of the mounting frame. The lifting adjustment component is used to adjust the height of the cleaning component and drive the cleaning component to contact the printed circuit board below it and perform cleaning and drying; The cleaning component is fixedly arranged on the lifting adjustment component. The cleaning component is used to clean the oil stains on the printed circuit board and perform air drying after the oil stain cleaning.

2. The printed circuit board surface treatment equipment according to claim 1, characterized in that: The conveying component includes a conveying frame, a driving roller, a driving conveying strip and a driving motor; There are two conveying frames arranged in parallel, and the two conveying frames are fixedly arranged on the mounting frame; There are two driving rollers, and the two driving rollers are respectively rotatably arranged at both ends of the conveying frame. The cross section of the driving roller is a regular polygon; The driving conveying strip is drivingly connected to the two driving rollers, and the driving conveying strip is used to convey printed circuit boards one by one; The driving motor is fixedly installed on the side of the conveying frame, and the driving motor is drivingly connected to one of the driving rollers.

3. The printed circuit board surface treatment equipment according to claim 2, characterized in that: The driving conveying strip includes a connecting strip and a connecting rotating shaft; There are multiple groups of connecting strips arranged in parallel. A carrying wire frame can be detachably arranged on each group of connecting strips, and the carrying wire frame is used to install the printed circuit board to be cleaned; The connecting rotating shaft is arranged between adjacent groups of connecting strips, and the connecting rotating shaft is rotatably connected to the adjacent groups of connecting strips.

4. The printed circuit board surface treatment equipment according to claim 3, characterized in that: The carrying wire frame includes a support wire frame, a connecting frame and a connecting knob; The connecting frame is arranged at both ends of the support wire frame. The connecting frame has an inverted "U" - shaped structure, and the connecting frame is sleeved on the connecting strip; The connecting knob is arranged on the connecting frame, and the connecting knob is used to be threadedly connected to the connecting strip.

5. The printed circuit board surface treatment equipment according to claim 1, characterized in that: The lifting adjustment component includes a driving strip, an adjustment screw rod, a mounting table and an adjustment motor; There are two symmetrically arranged driving strips, and the two driving strips are slidably arranged on the top of the mounting frame; The adjustment screw rod is rotatably installed on the mounting frame, and the adjustment screw rod is threadedly connected to the driving strip; The mounting table is movably connected to the two driving strips through connecting rods, and the mounting table performs lifting adjustment through the opening and contraction of the connecting rods; The adjustment motor is fixedly installed on the mounting frame, and the adjustment motor is drivingly connected to the adjustment screw rod.

6. The printed circuit board surface treatment equipment according to claim 5, characterized in that: The adjustment motor uses a servo motor.

7. The printed circuit board surface treatment equipment according to claim 5, characterized in that: A splash - proof frame body is fixedly arranged on the edge of the mounting table, and a movable window is opened on the splash - proof frame body.

8. The printed circuit board surface treatment equipment according to claim 5, characterized in that: The cleaning component includes an installation pipe, a water storage cylinder, a rotating panel and a cleaning brush; The installation pipe is fixedly arranged on the mounting table; The water storage cylinder is fixedly arranged at the end of the installation pipe, and the water storage cylinder is communicated with the installation pipe; The rotating panel is rotatably installed on the water storage cylinder, and a fluid driving channel is arranged on the rotating panel. The rotating panel rotates through water flow or air flow; The cleaning brush is installed on the rotating panel, and the cleaning brush is used to clean the surface of the printed circuit board.

9. The printed circuit board surface treatment equipment according to claim 8, characterized in that: The fluid drive channels are provided in multiple ways, and are evenly distributed in a circular pattern on the rotating panel. The fluid drive channels are arranged at an angle.

10. A method for surface treatment of a printed circuit board, employing a surface treatment apparatus for a printed circuit board as described in any one of claims 1-9, characterized in that, include: Loading: Place the printed circuit board to be cleaned onto the support frame and use the conveyor assembly to transport the printed circuit board to be cleaned to the bottom of the cleaning unit; Cleaning: Cleaning fluid is introduced into the installation pipe. The rotating panel is driven to rotate under the impact of the flowing cleaning fluid, and the printed circuit board to be cleaned is cleaned using a cleaning brush. Drying: Lift the rotating panel and introduce high-pressure airflow into the installation pipe. Use the high-pressure airflow to drive the rotating panel to rotate and perform airflow drying on the printed circuit board to be dried. Feeding: The cleaned and dried printed circuit boards are transported to the outside of the splash guard using the conveyor assembly, while the inside of the splash guard is loaded.

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