PCB board etching liquid continuous cleaning equipment

Abstract

This invention belongs to the field of PCB board processing technology, and in particular, it relates to a continuous PCB board etching solution cleaning device. Addressing the problems of wasted etching solution and inconsistent nozzle-PCB board spacing caused by existing dry ice particle cleaning methods, the invention proposes the following solution: A cleaning chamber is included, with a partition fixed inside. The cleaning chamber contains a cleaning chamber and a descaling chamber formed by the partition. The partition has a connecting port, and the cleaning chamber and descaling chamber are connected through this port. The cleaning chamber and descaling chamber are respectively equipped with a first conveying component and a second conveying component for conveying the PCB board from the descaling chamber to the cleaning chamber. This invention can remove and collect the etching solution adhering to the PCB board surface before dry ice particle cleaning, avoiding waste. Furthermore, during the subsequent dry ice particle cleaning process, the distance between the nozzle below the lifting pipe and the top of the PCB board is maintained at all times, thus enabling effective and comprehensive cleaning of the PCB board.

Description

Technical Field

[0001] This invention relates to the field of PCB board processing technology, and in particular to a continuous cleaning device for PCB board etching solution. Background Technology

[0002] PCB etching uses chemical solutions to remove excess copper conductors, forming the desired circuit pattern. After etching, the board surface must be cleaned to remove any residual etching solution to prevent corrosion of the circuitry and ensure the quality of the circuit pattern.

[0003] The existing technology still has the following shortcomings in the process of cleaning PCB boards with etching solution: 1. In the prior art, dry ice particle cleaning machines are generally used to clean the etching solution on PCB boards. However, when cleaning with dry ice particles, the etching solution attached to the PCB board sublimates and vaporizes with the dry ice particles, resulting in waste of the etching solution. 2. When cleaning with dry ice particles, the distance between the nozzle and the PCB board is in the range of 10-20 mm. However, the thickness of the PCB board is not uniform, which leads to the distance between the nozzle and the PCB board being too large or too small during subsequent cleaning, affecting the cleaning effect of the PCB board.

[0004] To address the aforementioned issues, this invention proposes a continuous cleaning device for PCB board etching solution. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of waste of etching solution and inconsistent spacing between nozzles and PCB boards caused by existing ice particle cleaning methods, and to propose a continuous PCB board etching solution cleaning device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A continuous cleaning device for PCB board etching solution includes a cleaning tank, a partition fixed inside the cleaning tank, a cleaning chamber and a liquid removal chamber formed by the partition inside the cleaning tank, a communication port provided inside the partition, and the cleaning chamber and the liquid removal chamber connected by the communication port, and a first conveying component and a second conveying component respectively provided in the cleaning chamber and the liquid removal chamber for conveying the PCB board from the liquid removal chamber to the cleaning chamber. It also includes a first vent pipe and a second vent pipe located in the liquid removal chamber, used to blow away the residual etching liquid at the top and bottom of the PCB board. The cleaning chamber is equipped with a fixed pipe and a lifting pipe for cleaning the top and bottom of the PCB board. The blowing structure, located inside the liquid removal chamber, is used to thoroughly blow away the residual etching solution on the PCB board. An adjustment mechanism, located inside the cleaning chamber, is used to control the distance between the lifting tube and the PCB board.

[0007] In one possible design, the first conveying component consists of multiple second rotating rollers, all of which rotate within the cleaning chamber. The second conveying component includes multiple first rotating rollers, all of which rotate within the descaling chamber. A conical conveying cylinder is fixedly fitted onto the outer wall of each of the first rotating rollers. The diameter of the conical conveying cylinder gradually decreases from one end to the other, allowing the PCB board to be conveyed at an incline. A first limiting plate is fixedly fitted onto the outer wall of the smaller diameter end of the conical conveying cylinder. A second limiting plate is fixedly fitted onto the outer wall of the second rotating roller corresponding to the first limiting plate. Both the second and first limiting plates are used to limit the movement of the PCB board during transport. The cleaning box has inlets on both sides, which are respectively connected to the cleaning chamber and the descaling chamber. The conical conveying cylinder conveys the PCB board within the descaling chamber, and its design allows the PCB board to be tilted at a certain angle, causing the etching solution on it to converge towards the lower end, facilitating subsequent initial removal and recovery of the etching solution.

[0008] In one possible design, the blowing structure includes two connecting brackets sliding on the inner wall of the top of the liquid removal chamber. The bottom ends of both connecting brackets are fixedly connected to the top of the first air outlet pipe. A nut block located between the two connecting brackets is fixed to the top of the first air outlet pipe. A first threaded rod threadedly connected to the nut block is rotatably connected inside the liquid removal chamber. Multiple first jet components are provided at the bottom of the first air outlet pipe for spraying compressed air toward the top of the PCB board. A U-shaped frame is slidably connected to the inner wall of the bottom of the liquid removal chamber. A second threaded rod is rotatably connected inside the liquid removal chamber and threadedly connected to the U-shaped frame. Multiple first connecting plates are fixed to the top of the U-shaped frame. Each of the multiple first connecting plates has an elastic structure, and the first connecting plates are fixedly connected to the second air outlet pipe through the elastic structure, for making the second air outlet pipe conform to the bottom of the conical conveying cylinder. The U-shaped frame and the second threaded rod are both located below the conical conveying cylinder. Multiple second jet components are provided at the top of the second air outlet pipe for... Compressed air is sprayed onto the bottom of the PCB board. One end of both the second and first threaded rods extends to one side of the cleaning chamber and is connected by a synchronous pulley and synchronous belt. A drive motor is fixed to the side of the cleaning chamber away from the synchronous pulley and synchronous belt via a frame. The output shaft of the drive motor is fixedly connected to one end of the second threaded rod via a coupling. The drive motor drives the first and second threaded rods to rotate via the synchronous pulley and synchronous belt. The first and second air outlets move synchronously. An external air compressor delivers air to the first and second air outlets through a first three-way pipe and sprays it onto the top and bottom of the PCB board through the first and second nozzles. This blows the etching solution on the PCB board towards the lower end of the PCB board. Since the first and second nozzles are arranged at a certain angle, the etching solution on the PCB board can flow along the inclined surface of the PCB board, initially removing the etching solution. The etching solution falls into the liquid removal chamber for easy reuse later.

[0009] In one possible design, the elastic structure includes a lifting groove disposed on one side of the first connecting plate, a fixed column fixedly disposed within the lifting groove, and a connecting arm slidably sleeved on the outer wall of the fixed column and fixedly connected to the second vent pipe. A first spring is fixed to the bottom of the connecting arm and the bottom inner wall of the lifting groove, and the first spring is sleeved on the outer wall of the fixed column. The cooperation between the first spring and the connecting arm causes the second vent pipe to fit against the bottom of the conical conveying cylinder. When the conical conveying cylinder conveys the PCB board, the etching solution on the PCB board will adhere to the surface of the conical conveying cylinder and accumulate into droplets at the bottom of the conical conveying cylinder. The second threaded rod drives the U-shaped frame and the second vent pipe to move to one side. Under the elastic force of the first spring, the second vent pipe touches the bottom of the conical conveying cylinder to scrape off the etching solution that has accumulated into droplets at the bottom of the conical conveying cylinder, thus preventing excessive etching solution from adhering to the conical conveying cylinder and re-adhering to the PCB board.

[0010] In one possible design, the adjustment structure includes multiple second connecting plates fixed to the bottom of the lifting tube. Each of the second connecting plates has a horizontal plate fixed to its bottom end. Each horizontal plate has a rubber wheel rotatably connected to its bottom via a base. The rubber wheel engages with the PCB board to push the lifting tube up and down. Both ends of the lifting tube are slidably connected to the inner walls of the cleaning chamber on both sides. The lifting tube and the fixed tube are located above and below the second rotating roller, respectively. Multiple nozzles are fixed to the sides of the lifting tube and the fixed tube that are close to each other, for blowing dry ice particles towards the top and bottom of the PCB board. A second three-way tube runs through the cleaning chamber. Two ends of the second three-way tube are connected to the fixed tube and the lifting tube, respectively. The other end of the second three-way tube is connected to an external dry ice particle cleaning machine. Limiting blocks located below the lifting tube are fixed to the inner walls of the cleaning chamber on both sides that are far apart, for limiting the movement of the lifting tube. The second rotating roller moves the PCB board to one side. Upon delivery, the PCB board engages with rubber wheels, propelling the horizontal plate and lifting tube upwards a certain distance. The distance between the nozzle at the bottom of the lifting tube and the top of the PCB board is controlled to ensure the dry ice particles effectively impact and clean the PCB surface. This avoids excessively close contact, which could cause localized low temperatures and damage, or excessive distance, which could result in poor cleaning. During PCB cleaning, an external dry ice cleaning machine uses the lifting tube, fixed tube, and nozzles to clean the top and bottom of the PCB board. The dry ice particles, under high-speed spray, come into contact with etching solution residues on the PCB board. The dry ice particles rapidly absorb heat and sublimate into gaseous carbon dioxide, generating a strong impact force. This impact force, combined with the low-temperature embrittlement effect of the dry ice, rapidly breaks down and peels off the etching solution residues. The peeled residues are carried away with the gas generated by the sublimation of the dry ice, leaving no residue. This comprehensively and effectively completes the PCB board cleaning process.

[0011] In one possible design, the top of the cleaning chamber is equipped with an air intake fan via an exhaust duct. A gas collection box is fixed to the top of the cleaning chamber, and one side of the gas collection box is connected to the exhaust duct via a first flexible hose for injecting gas from the cleaning chamber into the gas collection box. A second flexible hose is provided on the side of the gas collection box away from the first flexible hose. A mounting bracket is slidably connected inside the gas collection box, with its top extending above the gas collection box. A HEPA air filter is fixed inside the mounting bracket for filtering fine particles in the gas. During cleaning in the cleaning chamber, dry ice cleaning generates carbon dioxide, which is then transported to the gas collection box via the air intake fan. The HEPA air filter filters out fine particles in the gas, preventing these particles from being emitted into the outside air and polluting it.

[0012] In one possible design, the multiple rubber wheels located at the bottom of the horizontal plate correspond to the positions of the corresponding second rotating rollers, and the lifting tube and the fixed tube are located between two adjacent second rotating rollers.

[0013] In one possible design, the first jetting component and the second jetting component are positioned opposite each other and are both located between two adjacent conical conveying cylinders. The first jetting component consists of two first nozzles, and the second jetting component consists of two second nozzles. The first nozzles and the second nozzles are arranged at an angle of 15°-20° to blow the etching solution attached to the PCB board toward the lower end of the PCB board. Multiple first connecting plates are located between two adjacent conical conveying cylinders.

[0014] In one possible design, a first tee pipe runs through the cleaning chamber, with two ends of the first tee pipe connected to a first air outlet pipe and a second air outlet pipe, respectively, and the other end of the first tee pipe connected to an external air compressor for supplying compressed air to the first air outlet pipe and the second air outlet pipe.

[0015] In one possible design, the bottom inner wall of the connecting port is provided with multiple circular grooves, and each of the multiple circular grooves is slidably connected with a lifting rod. The bottom end of each of the multiple lifting rods is fixed with a second spring, and the bottom end of the second spring is fixed to the bottom inner wall of the corresponding circular groove. The top end of each of the multiple lifting rods is provided with a ball bearing for supporting the PCB board. The height of the multiple lifting rods gradually decreases along the axial direction of the conical conveying cylinder. The conical conveying cylinder conveys the PCB board through the connecting port into the cleaning chamber. During the conveying process, the lifting rods and the ball bearings support the PCB board under the action of the second spring. When the PCB board completely detaches from the conical conveying cylinder and moves onto the second rotating roller, the PCB board tilts and falls onto the second rotating roller. The cooperation of the lifting rods and the second spring can buffer the impact between the PCB board and the second rotating roller, thus ensuring the safety of the PCB board.

[0016] Beneficial effects: In this invention, the bottom ends of both connecting frames are fixedly connected to the top of the first air outlet pipe. The bottom of the first air outlet pipe is provided with multiple first jet components. The bottom inner wall of the liquid removal chamber is slidably connected with a U-shaped frame. The top of the U-shaped frame is fixed with multiple first connecting plates. The multiple first connecting plates are fixedly connected to the second air outlet pipe through an elastic structure. The top of the second air outlet pipe is provided with multiple second jet components. The diameter of the conical conveying cylinder gradually decreases from left to right from one end to the other. The first air outlet pipe and the second air outlet pipe move synchronously, spraying the top and bottom of the PCB board through the first nozzle and the second nozzle. With the design of the conical conveying cylinder, the etching liquid on the PCB board can flow along the inclined surface of the PCB board and be initially removed. The etching liquid falls into the liquid removal chamber for easy reuse in the later stage. In this invention, a lifting groove is provided on one side of the first connecting plate, and a fixed column is fixed in the lifting groove. A connecting arm that is fixedly connected to the second air outlet is slidably sleeved on the outer wall of the fixed column. A first spring is fixed to the bottom inner wall of the lifting groove. When the conical conveying cylinder conveys the PCB board, the etching liquid on the PCB board will adhere to the surface of the conical conveying cylinder and accumulate into droplets at the bottom of the conical conveying cylinder. The second threaded rod drives the U-shaped frame and the second air outlet to move to one side. Under the elastic force of the first spring, the second air outlet touches the bottom of the conical conveying cylinder to scrape off the etching liquid that has accumulated into droplets at the bottom of the conical conveying cylinder, so as to avoid excessive etching liquid adhering to the conical conveying cylinder and re-adhering to the PCB board. In this invention, a horizontal plate is fixed to the bottom of the lifting tube via a second connecting plate. A rubber wheel is rotatably connected to the bottom of the horizontal plate. The two ends of the lifting tube are slidably connected to the inner walls of the two sides of the cleaning chamber. The lifting tube and the fixed tube are located above and below the second rotating roller, respectively. Multiple nozzles are fixed on the sides of the lifting tube and the fixed tube that are close to each other. When the second rotating roller conveys the PCB board to one side, the PCB board cooperates with the rubber wheel and pushes the horizontal plate and the lifting tube to move upward a certain distance. The distance between the nozzle at the bottom of the lifting tube and the top of the PCB board is controlled to ensure that the dry ice particles can effectively impact and clean the surface of the PCB board.

[0017] In this invention, the etching solution adhering to the PCB board surface can be removed and collected before dry ice particle cleaning, avoiding waste of the etching solution. Furthermore, during the subsequent dry ice particle cleaning process, the distance between the nozzle below the lifting pipe and the top of the PCB board can be maintained at all times, thereby enabling effective and comprehensive cleaning of the PCB board. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention; Figure 2 This is a three-dimensional cross-sectional view of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention; Figure 3 This is a cross-sectional view of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention. Figure 4 This is a three-dimensional cross-sectional view of the partition, second rotating roller, and conical conveying cylinder of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention. Figure 5 This is a three-dimensional structural diagram of the first air outlet pipe, the second air outlet pipe, and the first nozzle of a PCB board etching solution continuous cleaning device provided in Embodiment 1 of the present invention. Figure 6This is a three-dimensional structural diagram of the second air outlet pipe and the conical conveying cylinder of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention; Figure 7 This is a three-dimensional exploded structural diagram of the first connecting plate and the fixing column of a PCB board etching solution continuous cleaning device provided in Embodiment 1 of the present invention. Figure 8 This is a three-dimensional structural diagram of the lifting pipe, fixing pipe, and rubber wheel of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention; Figure 9 This is a three-dimensional cross-sectional view of the gas collection box of a continuous cleaning device for PCB board etching solution provided in Embodiment 1 of the present invention. Figure 10 This is a three-dimensional structural diagram of the partition, lifting rod, second rotating roller and conical conveying cylinder of a continuous cleaning device for PCB board etching solution provided in Embodiment 2 of the present invention. Figure 11 This is a three-dimensional exploded view of the lifting rod and partition of a continuous cleaning device for PCB board etching solution provided in Embodiment 2 of the present invention.

[0019] In the diagram: 1. Cleaning box; 2. Partition; 3. Connecting port; 4. Cleaning chamber; 5. Liquid removal chamber; 6. Material inlet; 7. First rotating roller; 8. Conical conveyor cylinder; 9. First limiting plate; 10. Connecting frame; 11. First air outlet pipe; 12. Nut block; 13. First threaded rod; 14. First nozzle; 15. First tee pipe; 16. U-shaped frame; 17. Second threaded rod; 18. First connecting plate; 19. Second air outlet pipe; 20. Second nozzle; 21. Lifting trough; 22. Fixed column; 23. Connecting... 24. Arm; 25. First spring; 26. Fixed tube; 27. Nozzle; 28. Lifting tube; 29. ​​Limiting block; 20. Second connecting plate; 31. Horizontal plate; 32. Rubber wheel; 33. Second tee tube; 34. Suction fan; 35. Air collection box; 36. First hose; 37. Mounting bracket; 38. HEPA air filter; 39. Second hose; 40. Circular groove; 41. Lifting rod; 42. Second spring; 43. Ball bearing; 44. Second rotating roller; 45. Second limiting plate; 46. Drive motor. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Example 1: Refer to Figures 1-3The cleaning equipment relates to the field of PCB board processing technology. The equipment includes a cleaning box 1, inside which a partition 2 is fixedly installed. The partition 2 divides the internal space of the cleaning box 1 into two independent parts: a cleaning chamber 4 and a dehydration chamber 5. At the same time, a connecting port 3 is provided in the partition 2, so that the cleaning chamber 4 and the dehydration chamber 5 can be connected to each other through the connecting port 3.

[0022] Reference Figures 2-4 Within the cleaning chamber 4 and the descaling chamber 5, a first conveying component and a second conveying component are respectively provided for conveying the PCB board within these two chambers. Specifically, the first conveying component consists of multiple second rotating rollers 43, all of which are rotatably mounted within the cleaning chamber 4. The second conveying component comprises multiple first rotating rollers 7, all of which are rotatably mounted within the descaling chamber 5. In particular, a conical conveying cylinder 8 is fixedly fitted onto the outer wall of each first rotating roller 7. The diameter of this conical conveying cylinder 8 gradually decreases from one end to the other. This design allows the PCB board to be tilted during conveying, which helps in the collection and removal of the etching solution.

[0023] Reference Figure 4 A first limiting plate 9 is fixedly sleeved on the outer wall of the smaller diameter end of the conical conveyor cylinder 8, while a second limiting plate 44 is fixedly sleeved on the outer wall of one end of the second rotating roller 43, which corresponds to the first limiting plate 9. The two limiting plates work together to limit the PCB board during transportation and prevent it from shifting during the transportation process.

[0024] Reference Figure 3 In addition, there are material inlets 6 on both sides of the cleaning box 1. These two material inlets 6 are connected to the cleaning chamber 4 and the liquid removal chamber 5 respectively, which facilitates the entry and exit of the PCB board.

[0025] Reference Figure 2 , Figure 3 and Figure 5Within the liquid removal chamber 5, a dispersing structure is also provided to thoroughly disperse the residual etching solution on the PCB board. This dispersing structure includes two connecting brackets 10, which are slidably mounted on the top inner wall of the liquid removal chamber 5 and fixedly connected at their bottom to the top of the first air outlet pipe 11. A nut block 12 is also fixedly fixed to the top of the first air outlet pipe 11, and this nut block 12 is threadedly engaged with a first threaded rod 13 rotatably connected within the liquid removal chamber 5. Multiple first jet components are provided at the bottom of the first air outlet pipe 11 for spraying compressed air onto the top of the PCB board. Simultaneously, a U-shaped frame 16 is slidably connected to the bottom inner wall of the liquid removal chamber 5. Multiple first connecting plates 18 are fixed to the top of this U-shaped frame 16, each containing an elastic structure, and fixedly connected to a second air outlet pipe 19 through this elastic structure. This design allows the second air outlet pipe 19 to fit tightly against the bottom of the conical conveyor cylinder 8. Multiple second jet components are provided at the top of the second air outlet pipe 19 for spraying compressed air onto the bottom of the PCB board. Specifically, one end of both the first threaded rod 13 and the second threaded rod 17 rotatably extends to one side of the cleaning box 1 and is connected by a synchronous pulley and a synchronous belt. On the side of the cleaning box 1 away from the synchronous pulley and the synchronous belt, a drive motor 45 is fixed by a frame, and the output shaft of this drive motor 45 is fixedly connected to one end of the second threaded rod 17 by a coupling.

[0026] Specifically, when the drive motor 45 starts, it drives the first threaded rod 13 and the second threaded rod 17 to rotate synchronously via the synchronous pulley and synchronous belt, thereby driving the first air outlet pipe 11 and the second air outlet pipe 19 to move synchronously. At this time, an external air compressor delivers air through the first three-way pipe 15 to the first air outlet pipe 11 and the second air outlet pipe 19, and sprays it onto the top and bottom of the PCB board through the first nozzle 14 and the second nozzle 20. This blows the etching solution on the PCB board towards the lower end of the PCB board and makes it flow along the inclined surface of the PCB board, achieving preliminary removal of the etching solution. The removed etching solution falls into the liquid removal chamber 5 for later reuse.

[0027] Reference Figure 6 and Figure 7 The elastic structure includes a lifting groove 21 provided on one side of the first connecting plate 18, and a fixing post 22 is firmly fixed inside the lifting groove 21. A connecting arm 23 is slidably sleeved on the outer wall of the fixing post 22, and the connecting arm 23 is firmly fixedly connected to the second air outlet pipe 19. A first spring 24 is fixed between the bottom of the connecting arm 23 and the bottom inner wall of the lifting groove 21, and the first spring 24 is also sleeved on the outer wall of the fixing post 22.

[0028] This structure allows the second vent pipe 19 to fit tightly against the bottom of the conical conveyor cylinder 8 under the elastic force of the first spring 24. When the conical conveyor cylinder 8 conveys the PCB board, the etching solution on the PCB board adheres to the surface of the conical conveyor cylinder 8 and accumulates into droplets at its bottom. At this time, the U-shaped frame 16 and the second vent pipe 19 are moved to one side by the second threaded rod 17. Due to the elastic force of the first spring 24, the second vent pipe 19 will come into close contact with the bottom of the conical conveyor cylinder 8, thereby scraping off the accumulated etching solution droplets and effectively preventing excessive etching solution adhering to the conical conveyor cylinder 8 from re-adhering to the PCB board.

[0029] Reference Figure 2 , Figure 3 and Figure 8 Inside the cleaning chamber 4, a fixed tube 25 and a lifting tube 27 are installed for cleaning the top and bottom of the PCB board. An adjustment structure is also provided to control the distance between the lifting tube 27 and the PCB board to ensure effective cleaning. The adjustment structure includes multiple second connecting plates 29 fixed to the bottom of the lifting tube 27, each with a horizontal plate 30 securely fixed to its bottom end. At the bottom of the horizontal plate 30, rubber wheels 31 are rotatably connected to a base. These rubber wheels 31 cooperate with the PCB board to push the lifting tube 27 up and down. Both ends of the lifting tube 27 are slidably connected to the inner walls of both sides of the cleaning chamber 4, ensuring smooth up-and-down movement. The lifting tube 27 and the fixed tube 25 are located above and below the second rotating roller 43, respectively, and multiple nozzles 26 are fixed to their adjacent sides to blow dry ice particles towards the top and bottom of the PCB board. A second three-way pipe 32 runs through the cleaning chamber 1. Two ends of the second three-way pipe 32 are connected to the fixed pipe 25 and the lifting pipe 27, respectively, and the other end is connected to the external dry ice particle cleaning machine. Limiting blocks 28 are fixed on both sides of the inner wall of the cleaning chamber 4. These limiting blocks 28 are located below the lifting pipe 27 and are used to limit the movement of the lifting pipe 27.

[0030] Specifically, when the second rotating roller 43 conveys the PCB board to one side, the PCB board cooperates with the rubber wheel 31 to push the horizontal plate 30 and the lifting tube 27 upward a certain distance, thereby controlling the distance between the nozzle 26 at the bottom of the lifting tube 27 and the top of the PCB board. This ensures that the dry ice particles can effectively impact and clean the surface of the PCB board, while avoiding damage to the PCB board due to excessively low local temperatures caused by being too close, or poor cleaning effect due to being too far away. When cleaning the PCB board, the external dry ice particle cleaning machine uses the lifting tube 27, the fixed tube 25, and the nozzle 26 to clean the top and bottom of the PCB board. Under high-speed jetting, the dry ice particles come into contact with the etching solution residue on the PCB board, quickly absorb heat, and sublimate into gaseous carbon dioxide, generating a strong impact force. This impact force, combined with the low-temperature embrittlement effect of dry ice, causes the etching solution residue to quickly disintegrate and peel off. The peeled residue is carried away with the gas generated by the sublimation of dry ice, thus comprehensively and effectively completing the cleaning operation of the PCB board.

[0031] Reference Figure 1 , Figure 2 , Figure 3 and Figure 9 At the top of the cleaning chamber 1, an air intake fan 33 is installed via an exhaust duct to extract gas from the cleaning chamber 4. Simultaneously, a gas collection box 34 is securely fixed to the top of the cleaning chamber 1. One side of the gas collection box 34 is connected to the exhaust duct via a first flexible hose 35, used to inject gas from the cleaning chamber 4 into the gas collection box 34. A second flexible hose 38 is provided on the side of the gas collection box 34 away from the first flexible hose 35 for discharging filtered gas. Inside the gas collection box 34, a mounting bracket 36 is slidably connected, with its top extending above the gas collection box 34 for easy removal and replacement. Inside the mounting bracket 36, a HEPA air filter 37 is fixed for filtering fine particles in the gas.

[0032] Specifically, during cleaning in the cleaning chamber 4, the carbon dioxide gas formed after dry ice cleaning is transported to the air collection box 34 through the intake fan 33, while the HEPA air filter 37 can effectively filter the tiny particles in the gas, preventing these tiny particles from being emitted to the outside and causing air pollution.

[0033] Reference Figure 3 and Figure 8 At the bottom of the horizontal plate 30 inside the cleaning box 1, we installed multiple rubber wheels 31. The positions of these rubber wheels 31 are specially designed to correspond to the positions of the corresponding second rotating rollers 43 to ensure the stability and continuity of the PCB board during the conveying process. In addition, the lifting tube 27 and the fixing tube 25 are cleverly placed between two adjacent second rotating rollers 43 to accommodate the conveying and cleaning needs of the PCB board.

[0034] Reference Figure 3 and Figure 5 The first and second jetting components are designed to be positioned opposite each other and located between two adjacent conical conveying cylinders 8. The first jetting component consists of two first nozzles 14, while the second jetting component consists of two second nozzles 20. These nozzles are designed to be arranged at an angle of 15°-20°, which effectively blows the etching solution adhering to the PCB board towards the lower end of the PCB board, thereby achieving continuous removal of the etching solution. Simultaneously, multiple first connecting plates 18 are also placed between two adjacent conical conveying cylinders 8 to further support the stable operation of the jetting components.

[0035] Reference Figure 5 We inserted a first T-connector 15 through the cleaning chamber 1. Two ends of the first T-connector 15 are connected to the first exhaust pipe 11 and the second exhaust pipe 19, respectively, while the other end is connected to an external air compressor. In this way, the air compressor can deliver compressed air to the first exhaust pipe 11 and the second exhaust pipe 19 through the first T-connector 15, thereby providing the necessary power to the jet components.

[0036] Through the above design, this equipment can achieve continuous cleaning of PCB board etching solution, which not only improves cleaning efficiency, but also helps to recycle the etching solution and reduce production costs.

[0037] Example 2: Reference Figure 10 and Figure 11 Multiple circular grooves 39 are provided on the bottom inner wall of the connecting port 3. Lifting rods 40 are slidably connected within each of these grooves 39. A second spring 41 is fixed to the bottom end of each lifting rod 40, and the bottom end of the second spring 41 is fixed to the bottom inner wall of the corresponding circular groove 39. Ball bearings 42 are provided at the top of each lifting rod 40, and these ball bearings 42 are used to support the PCB board. Specifically, we designed the height of the multiple lifting rods 40 to gradually decrease along the axial direction of the conical conveying cylinder 8.

[0038] When the conical conveyor cylinder 8 transports the PCB board through the connecting port 3 into the cleaning chamber 4, the lifting rod 40 and the ball bearing 42 provide good support for the PCB board under the action of the second spring 41. When the PCB board completely detaches from the conical conveyor cylinder 8 and moves onto the second rotating roller 43, it will naturally fall onto the second rotating roller 43 because it is now tilted. During this process, the cooperation between the lifting rod 40 and the second spring 41 acts as a buffer, preventing a large impact between the PCB board and the second rotating roller 43, thus ensuring the safety of the PCB board.

[0039] A method for using a continuous cleaning device for PCB board etching solution includes the following steps: S1. The etched PCB board is placed in the liquid removal chamber 5 through the material port 6. The PCB board is located above multiple conical conveying cylinders 8. The conical conveying cylinders 8 transport the PCB board. Since the diameter of the conical conveying cylinders 8 gradually decreases from left to right, the PCB board is placed at an angle, causing the etching liquid on the PCB board to gradually flow to one side. S2. When the conical conveyor 8 rotates to convey the PCB board, the drive motor 45 drives the first threaded rod 13 and the second threaded rod 17 to rotate through the synchronous pulley and synchronous belt. The first air outlet pipe 11 and the second air outlet pipe 19 move synchronously. The external air compressor delivers air through the first three-way pipe 15 to the first air outlet pipe 11 and the second air outlet pipe 19, and sprays it onto the top and bottom of the PCB board through the first nozzle 14 and the second nozzle 20, blowing the etching liquid on the PCB board towards the lower end of the PCB board. Since the first nozzle 14 and the second nozzle 20 are arranged at a certain angle, the etching liquid on the PCB board can flow along the inclined surface of the PCB board, initially removing the etching liquid from the PCB board. The etching liquid falls into the liquid removal chamber 5 for easy reuse later. S3. When the conical conveyor 8 conveys the PCB board, the etching solution on the PCB board will adhere to the surface of the conical conveyor 8 and accumulate into droplets at the bottom of the conical conveyor 8. The second threaded rod 17 drives the U-shaped frame 16 and the second vent pipe 19 to move to one side. Under the elastic force of the first spring 24, the second vent pipe 19 touches the bottom of the conical conveyor 8 to scrape off the etching solution that has accumulated into droplets at the bottom of the conical conveyor 8, so as to prevent too much etching solution from adhering to the conical conveyor 8 and re-adhering to the PCB board. S4. The conical conveyor 8 conveys the PCB board into the cleaning chamber 4 through the connecting port 3. During the conveying process, the lifting rod 40 and the ball bearing 42 support the PCB board under the action of the second spring 41. When the PCB board completely detaches from the conical conveyor 8 and moves onto the second rotating roller 43, the PCB board tilts and falls onto the second rotating roller 43. The cooperation between the lifting rod 40 and the second spring 41 can buffer the PCB board and prevent a large impact between the PCB board and the second rotating roller 43, thus ensuring the safety of the PCB board. S5. When the second rotating roller 43 conveys the PCB board to one side, the PCB board cooperates with the rubber wheel 31, pushing the horizontal plate 30 and the lifting tube 27 upward a certain distance. The distance between the nozzle 26 at the bottom of the lifting tube 27 and the top of the PCB board is controlled to ensure that the dry ice particles can effectively impact and clean the surface of the PCB board. At the same time, it avoids that if the distance is too close, the local temperature may be too low and damage the PCB board, or if the distance is too far, the cleaning effect will be poor. When cleaning the PCB board, the external dry ice particle cleaning machine cleans the top and bottom of the PCB board with dry ice through the lifting tube 27, the fixed tube 25 and the nozzle 26. The dry ice particles come into contact with the etching solution residue on the PCB board under high-speed spray. The dry ice particles quickly absorb heat and sublimate into gaseous carbon dioxide, generating a strong impact force. This impact force and the low-temperature embrittlement effect of dry ice work together to quickly break down and peel off the etching solution residue. The peeled residue is carried away with the gas generated by the sublimation of dry ice, leaving no residue. The cleaning operation of the PCB board is completed in a comprehensive and effective manner. S6. During cleaning, the generated gas is transported to the air collection box 34 through the intake fan 33, and the HEPA air filter 37 can filter the tiny particles in the gas. When cleaning in the cleaning chamber 4, the dry ice cleaning forms carbon dioxide. The carbon dioxide gas is transported to the air collection box 34 through the intake fan 33, and the HEPA air filter 37 can filter the tiny particles in the gas, preventing these tiny particles from being emitted into the outside air and polluting it.

[0040] However, as is well known to those skilled in the art, the working principle and wiring method of the drive motor 45 and the intake fan 33 are commonplace and are all conventional methods or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0041] 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 plate etching liquid continuous cleaning device, characterized in that, The system includes a cleaning box (1), a partition (2) is fixed inside the cleaning box (1), a cleaning chamber (4) and a liquid removal chamber (5) are formed inside the cleaning box (1) through the partition (2), a connecting port (3) is provided inside the partition (2), and the cleaning chamber (4) and the liquid removal chamber (5) are connected through the connecting port (3). A first conveying component and a second conveying component are respectively provided in the cleaning chamber (4) and the liquid removal chamber (5). The first conveying component is composed of multiple second rotating rollers (43), and the multiple second rotating rollers (43) rotate in the cleaning chamber (4). The second conveying component includes multiple first rotating rollers (7), and the multiple first rotating rollers (7) rotate in the dehydration chamber (5). The outer wall of the first rotating roller (7) is fixedly fitted with a conical conveying cylinder (8). The diameter of the conical conveying cylinder (8) gradually decreases from one end to the other end, which is used to make the PCB board tilted for conveying. The outer wall of the smaller diameter end of the conical conveying cylinder (8) is fixedly fitted with a first limiting plate (9). The outer wall of the second rotating roller (43) corresponding to the first limiting plate (9) is fixedly fitted with a second limiting plate (44). The second limiting plate (44) and the first limiting plate (9) are both used to limit the PCB board during transportation. The cleaning box (1) is provided with a material port (6) on both sides, and the two material ports (6) are respectively connected to the cleaning chamber (4) and the dehydration chamber (5). It also includes a first vent pipe (11) and a second vent pipe (19) located in the liquid removal chamber (5), and the cleaning chamber (4) is provided with a fixed pipe (25) and a lifting pipe (27). The blowing structure is set in the liquid removal chamber (5) to thoroughly blow away the residual etching solution on the PCB board; The blowing structure includes two connecting brackets (10) that slide on the inner wall of the top of the liquid removal chamber (5). The bottom ends of the two connecting brackets (10) are fixedly connected to the top of the first air outlet pipe (11). A nut block (12) located between the two connecting brackets (10) is fixedly fixed to the top of the first air outlet pipe (11). A first threaded rod (13) that is threadedly connected to the nut block (12) is rotatably connected to the liquid removal chamber (5). A plurality of first jet components are provided at the bottom of the first air outlet pipe (11) for spraying compressed air toward the top of the PCB board. A U-shaped frame (16) is slidably connected to the inner wall of the bottom of the liquid removal chamber (5). A second threaded rod (17) is rotatably connected to the liquid removal chamber (5) and threadedly connected to the U-shaped frame (16). A plurality of first connecting plates (18) are fixed to the top of the U-shaped frame (16). Each of the first connecting plates (18) is provided with an elastic structure, and the first connecting plate (18) is fixedly connected to the second air outlet pipe (19) through the elastic structure, so that the second air outlet pipe (19) fits against the bottom of the conical conveying cylinder (8). The U-shaped frame (16) and the second threaded rod (17) are both located below the conical conveying cylinder (8). The top of the second air outlet pipe (19) is provided with a plurality of second jet components, which are used to spray compressed air toward the bottom of the PCB board. One end of the second threaded rod (17) and the first threaded rod (13) are both rotatably extended to one side of the cleaning box (1) and connected by synchronous pulley and synchronous belt drive. The side of the cleaning box (1) away from the synchronous pulley and synchronous belt is fixed with a drive motor (45) through the frame. The output shaft of the drive motor (45) is fixedly connected to one end of the second threaded rod (17) through a coupling. An adjustment structure is set inside the cleaning chamber (4) to control the distance between the lifting tube (27) and the PCB board.

2. The PCB plate etching liquid continuous cleaning device according to claim 1, wherein, The elastic structure includes a lifting groove (21) disposed on one side of the first connecting plate (18), a fixed column (22) is fixed in the lifting groove (21), a connecting arm (23) is slidably sleeved on the outer wall of the fixed column (22) and fixedly connected to the second air outlet pipe (19), a first spring (24) is fixed to the bottom of the connecting arm (23) and the bottom inner wall of the lifting groove (21), and the first spring (24) is sleeved on the outer wall of the fixed column (22). The cooperation between the first spring (24) and the connecting arm (23) causes the second air outlet pipe (19) to fit against the bottom of the conical conveying cylinder (8).

3. The PCB etching liquid continuous cleaning apparatus according to claim 2, wherein, The adjustment structure includes multiple second connecting plates (29) fixed to the bottom of the lifting tube (27). A horizontal plate (30) is fixed to the bottom end of each of the multiple second connecting plates (29). A rubber wheel (31) is rotatably connected to the bottom of each of the multiple horizontal plates (30) via a base. The rubber wheel (31) cooperates with the PCB board to push the lifting tube (27) up and down. Both ends of the lifting tube (27) are slidably connected to the inner walls of both sides of the cleaning chamber (4). The lifting tube (27) and the fixed tube (25) are located above and below the second rotating roller (43), respectively. 7) Multiple nozzles (26) are fixed on the side close to the fixed tube (25) to blow dry ice particles toward the top and bottom of the PCB board. A second three-way tube (32) runs through the cleaning box (1). Two ends of the second three-way tube (32) are connected to the fixed tube (25) and the lifting tube (27) respectively. The other end of the second three-way tube (32) is connected to the external dry ice particle cleaning machine. Limiting blocks (28) located below the lifting tube (27) are fixed on the inner walls of the two sides of the cleaning chamber (4) that are far apart from each other to limit the lifting tube (27).

4. The PCB plate etching liquid continuous cleaning device according to claim 3, characterized in that, The top of the cleaning box (1) is equipped with an air intake fan (33) through an exhaust channel. The top of the cleaning box (1) is fixed with an air collection box (34). One side of the air collection box (34) is connected to the exhaust channel through a first hose (35) for injecting the gas in the cleaning chamber (4) into the air collection box (34). The side of the air collection box (34) away from the first hose (35) is equipped with a second hose (38). A mounting bracket (36) is slidably connected inside the air collection box (34), and the top of the mounting bracket (36) extends to the top of the air collection box (34). A HEPA air filter (37) is fixed inside the mounting bracket (36) for filtering small particles in the gas.

5. The PCB plate etching liquid continuous cleaning device according to claim 4, characterized in that, The multiple rubber wheels (31) located at the bottom of the horizontal plate (30) correspond to the positions of the corresponding second rotating rollers (43), and the lifting tube (27) and the fixed tube (25) are located between two adjacent second rotating rollers (43).

6. The PCB plate etching liquid continuous cleaning device according to claim 5, wherein, The first jet component and the second jet component are positioned correspondingly and are both located between two adjacent conical conveying cylinders (8). The first jet component consists of two first nozzles (14), and the second jet component consists of two second nozzles (20). The first nozzles (14) and the second nozzles (20) are arranged at an angle of 15°-20° to blow the etching solution attached to the PCB board to the lower end of the PCB board. Multiple first connecting plates (18) are located between two adjacent conical conveying cylinders (8).

7. The PCB plate etching liquid continuous cleaning device according to claim 6, characterized in that, The cleaning box (1) has a first three-way pipe (15) running through it. Two ends of the first three-way pipe (15) are connected to the first air outlet pipe (11) and the second air outlet pipe (19) respectively. The other end of the first three-way pipe (15) is connected to an external air compressor for supplying compressed air to the first air outlet pipe (11) and the second air outlet pipe (19).

8. The PCB plate etching liquid continuous cleaning device according to claim 7, characterized in that, The bottom inner wall of the connecting port (3) is provided with multiple circular grooves (39), and each of the multiple circular grooves (39) is slidably connected with a lifting rod (40). The bottom end of each of the multiple lifting rods (40) is fixed with a second spring (41), and the bottom end of the second spring (41) is fixed to the bottom inner wall of the corresponding circular groove (39). The top end of each of the multiple lifting rods (40) is provided with a ball (42) for supporting the PCB board. The height of the multiple lifting rods (40) gradually decreases along the axial direction of the conical conveying cylinder (8).

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