Pickling device for computer circuit board

Abstract

The invention discloses a pickling device for a computer circuit board, and relates to the technical field of circuit board production, the pickling device comprises a pickling tank and two lifting cylinders, the two lifting cylinders are installed on the outer side of the pickling tank, the movable ends of the two lifting cylinders are jointly connected with a connecting frame, four connecting rods are connected to the lower portion of the connecting frame, and the connecting rods are connected with the pickling tank. The lower end of each connecting rod is connected with a cleaning frame, and a clamping conversion mechanism is arranged on the cleaning frame and used for alternately replacing clamping parts of a circuit board. The clamping conversion mechanism is arranged, and the first sliding block and the second sliding block are driven to slide in opposite directions by using the change of the liquid level in the pickling tank and taking buoyancy as a drive; the second limiting block replaces the first limiting block to clamp and limit the circuit board, so that clamping conversion is realized, a clamped area on the circuit board can be in contact with a pickling solution, a pickling missing area of the circuit board is avoided, and the pickling quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of circuit board manufacturing technology, and in particular to an acid pickling apparatus for computer circuit boards. Background Technology

[0002] Pickling is a crucial step in the manufacturing process of computer circuit boards. Its purpose is to remove various contaminants such as oxides, rust, and residual alkaline substances from the circuit boards to ensure they possess good electrical and solderability, thereby guaranteeing the overall stability and reliability of the computer's operation. Currently, the common method for pickling computer circuit boards involves clamping both ends of the board in a cleaning frame, immersing it in an pickling tank, and then activating a spray system to pickle the board.

[0003] However, existing pickling methods still have the following problems: Circuit boards usually have a large number of vias, insertion holes, and other hole structures. These holes are not only small in size but also densely distributed, making it difficult for the pickling solution sprayed by the spraying equipment to penetrate into the holes. Because the pickling solution cannot fully contact the contaminants in the holes, the contaminants in the holes are difficult to be effectively removed. During the pickling process using a cleaning frame to hold the circuit board, the clamping component directly blocks part of the circuit board. Because these blocked parts cannot fully contact the pickling solution, pickling omissions will occur during the pickling process. When the circuit board is removed from the pickling tank after pickling, a large amount of residual pickling solution will adhere to its surface and holes. If this residual pickling solution is not removed in time and thoroughly, it will seriously affect the processing of the next process. Therefore, a pickling device for computer circuit boards is proposed. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by providing an acid pickling device for computer circuit boards.

[0005] A pickling device for computer circuit boards includes a pickling tank and two lifting cylinders. The two lifting cylinders are installed on the outside of the pickling tank. The movable ends of the two lifting cylinders are connected to a connecting frame. Four connecting rods are connected to the bottom of the connecting frame. The lower end of each connecting rod is connected to a cleaning frame. The cleaning frame is provided with a clamping and changing mechanism for alternating the clamping parts of the circuit board. The pickling tank is provided with a pickling auxiliary mechanism for agitating the pickling solution and cleaning the residual pickling solution on the circuit board after pickling.

[0006] Preferably, the clamping and changing mechanism includes a pair of first limiting blocks and a pair of second limiting blocks. Cavities are respectively formed on both sides of the cleaning frame. First and second connecting grooves are respectively formed on both sides of the inner frame of the cleaning frame, communicating with the cavities. The pair of first limiting blocks are respectively slidably and sealingly connected to the two first connecting grooves, and the pair of second limiting blocks are respectively slidably and sealingly connected to the two second connecting grooves. First and second sliding grooves are respectively formed on the cavity wall, corresponding to the positions of the first and second connecting grooves. A first slider is slidably connected in the first sliding groove, and a second slider is slidably connected in the second sliding groove. An electric telescopic cylinder is connected to the first slider, and the movable end of the electric telescopic cylinder is connected to the first limiting block. A push rod is connected to the second slider, and the end of the push rod away from the second slider is connected to the second limiting block.

[0007] Preferably, each cavity is rotatably connected to a first gear on the upper wall of the first slide groove, and a first rack is connected to the first slider, the first rack meshing with the first gear. A second gear is rotatably connected to the lower wall of the second slide groove, and a second rack is connected to the bottom of the second slider, the second rack meshing with the second gear. A slide rod is slidably connected through the top of each cavity, and a transmission rack is connected to the slide rod, meshing with both the first and second gears. A spring is connected to the bottom of the slide rod, the lower end of the spring connecting to the bottom wall of the cavity. A float is connected to the end of the slide rod outside the cleaning frame.

[0008] Preferably, the pickling auxiliary mechanism includes a fixed cylinder and a hydraulic cylinder. The fixed cylinder is installed at the bottom center of the pickling tank. Four fixed frames are connected in a circular array around the fixed cylinder at the bottom of the pickling tank. Each fixed frame has a slot at its top that matches a cleaning frame. The four cleaning frames are distributed in a circular array around the fixed cylinder. Each fixed frame is connected to a connecting cylinder on its side near the fixed cylinder. The fixed cylinder has four openings near its bottom that communicate with the four connecting cylinders. A lifting block is slidably connected inside the fixed cylinder. The hydraulic cylinder is installed at the top of the fixed cylinder. The movable end of the hydraulic cylinder passes through the top of the fixed cylinder and connects to the top of the lifting block.

[0009] Preferably, an air storage box is installed between the inner wall of the pickling tank near the top and the fixed cylinder. The air storage box is provided with four lifting channels for the four cleaning frames to lift and pass through. The air storage box is provided with two symmetrical jet nozzles at each lifting channel. The jet nozzles are connected to the air storage box and an electric control valve is provided at the connection. The top of the fixed cylinder is connected to multiple air guide pipes. The end of each air guide pipe away from the fixed cylinder is connected to the air storage box. An air inlet is opened at the top of the fixed cylinder.

[0010] Preferably, each of the air guide tubes is provided with a one-way valve at one end near the fixed cylinder, and the fixed cylinder is provided with a one-way valve at the air inlet.

[0011] Preferably, both the first limiting block and the second limiting block have limiting grooves for clamping and limiting the circuit board.

[0012] Preferably, the height of the lifting block is half the height of the fixed cylinder, and the highest point of the opening on the fixed cylinder is lower than half the height of the cylinder body.

[0013] Preferably, the opening of each of the jet nozzles is tilted downwards.

[0014] Compared with existing technologies, the advantages of this invention are: 1. The present invention is provided with a clamping and changing mechanism. By utilizing the change in the liquid level in the pickling tank, the first slider and the second slider are driven by buoyancy to slide in opposite directions. The second limiting block replaces the first limiting block to clamp and limit the circuit board, thereby realizing the change of clamping. This allows the clamped area on the circuit board to also come into contact with the pickling solution, avoiding any missed pickling areas on the circuit board and ensuring the quality of pickling.

[0015] 2. This invention is equipped with an acid pickling auxiliary mechanism. By controlling the lifting block to move up and down repeatedly, the pickling solution is stirred and flows around the circuit board repeatedly, so that the circuit board and the pickling solution are in full contact, improving the pickling efficiency. On the other hand, the air storage tank is filled with air. After the pickling is completed, the high-pressure air in the air storage tank is released and sprayed onto the lifted circuit board through the jet nozzle. The high-speed airflow blows off the residual pickling solution on the circuit board, reducing the impact of the residual pickling solution on the next process of the circuit board. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a cross-sectional view of the structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the connection between the lifting cylinder and the cleaning frame in this invention.

[0019] Figure 4 This is a schematic diagram of the pickling auxiliary mechanism in this invention.

[0020] Figure 5 This is a cross-sectional view of the pickling auxiliary mechanism in this invention.

[0021] Figure 6 This is a schematic diagram of the gas storage tank section in this invention.

[0022] Figure 7 This is a cross-sectional view of the cleaning frame in this invention.

[0023] Figure 8 for Figure 7 Enlarged diagram of point A in the middle.

[0024] In the diagram: 1. Pickling tank, 11. Lifting cylinder, 12. Connecting frame, 13. Connecting rod, 14. Cleaning frame, 2. Pickling auxiliary mechanism, 21. Fixed cylinder, 22. Fixed frame, 221. Slot, 23. Connecting cylinder, 24. Lifting block, 25. Hydraulic cylinder, 26. Air tank, 261. Lifting channel, 27. Air nozzle, 28. Air guide pipe, 29. Air inlet, 3. Clamping and changing mechanism, 31. Cavity, 32. First connecting groove, 321. First limiting block, 33. Second connecting groove, 331. Second limiting block, 34. First sliding groove, 341. First slider, 342. Electric telescopic cylinder, 343. First rack, 344. First gear, 35. Second sliding groove, 351. Second slider, 352. Push rod, 353. Second rack, 354. Second gear, 36. Slide rod, 37. Transmission rack, 38. Spring, 39. Float. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Reference Figures 1-8 As shown, a pickling device for a computer circuit board includes a pickling tank 1 and two lifting cylinders 11. The two lifting cylinders 11 are installed on the outside of the pickling tank 1. The movable ends of the two lifting cylinders 11 are connected to a connecting frame 12. Four connecting rods 13 are connected to the bottom of the connecting frame 12. The lower end of each connecting rod 13 is connected to a cleaning frame 14. The inner frame size of the cleaning frame 14 matches the circuit board. When the circuit board is placed in the cleaning frame 14, the gap between the inner frame and the circuit board is small. The cleaning frame 14 is provided with a clamping and changing mechanism 3 for alternating the clamping parts of the circuit board. The pickling tank 1 is provided with a pickling auxiliary mechanism 2 for agitating the pickling solution and cleaning the residual pickling solution on the circuit board after pickling.

[0027] In this embodiment, the clamping and changing mechanism 3 includes a pair of first limiting blocks 321 and a pair of second limiting blocks 331. Cavities 31 are respectively formed on both sides of the cleaning frame 14. First connecting grooves 32 and second connecting grooves 33 are respectively formed on both sides of the inner frame of the cleaning frame 14, communicating with the cavities 31. The pair of first limiting blocks 321 are respectively slidably connected to the two first connecting grooves 32, and the pair of second limiting blocks 331 are respectively slidably connected to the two second connecting grooves 33. First sliding grooves 34 and second sliding grooves 35 are formed on the cavity wall of the cavity 31, respectively communicating with the first connecting grooves 32 and... The second connecting groove 33 is positioned correspondingly. A first slider 341 is slidably connected in the first sliding groove 34, and a second slider 351 is slidably connected in the second sliding groove 35. An electric telescopic cylinder 342 is connected to the first slider 341. The movable end of the electric telescopic cylinder 342 is connected to the first limiting block 321. A push rod 352 is connected to the second slider 351. The end of the push rod 352 away from the second slider 351 is connected to the second limiting block 331. Limiting grooves are provided on both the first limiting block 321 and the second limiting block 331 for clamping and limiting the circuit board.

[0028] In this embodiment, each cavity 31 is rotatably connected to a first gear 344 on the upper cavity wall of the first slide groove 34. A first rack 343 is connected to the first slider 341, and the first rack 343 meshes with the first gear 344. A second gear 354 is rotatably connected to the lower cavity wall of the second slide groove 35. A second rack 353 is connected to the bottom of the second slider 351, and the second rack 353 meshes with the second gear 354. A slide rod 36 is slidably connected through the top of each cavity 31. The slide rod 36 is slidably connected to the cleaning frame 14 in a sealed manner. A transmission rack 37 is connected to the slide rod 36, and the transmission rack 37 meshes with both the first gear 344 and the second gear 354. A spring 38 is connected to the bottom of the slide rod 36, and the lower end of the spring 38 is connected to the bottom cavity wall of the cavity 31. A float 39 is connected to the outer end of the slide rod 36 outside the cleaning frame 14.

[0029] In this embodiment, the pickling auxiliary mechanism 2 includes a fixed cylinder 21 and a hydraulic cylinder 25. The fixed cylinder 21 is installed at the bottom center of the pickling tank 1. Four fixed frames 22 are connected in a circular array around the fixed cylinder 21 at the bottom of the pickling tank 1. Each fixed frame 22 has a slot 221 at its top that matches the cleaning frame 14. The depth of the slot 221 is slightly less than the height of the cleaning frame 14. The four cleaning frames 14 are distributed in a circular array around the fixed cylinder 21. Each fixed frame 22 is connected to a connecting cylinder 23 on the side near the fixed cylinder 21. The fixed cylinder 21 has four openings near its bottom that communicate with the four connecting cylinders 23. A lifting block 24 is slidably connected inside the fixed cylinder 21. The hydraulic cylinder 25 is installed at the top of the fixed cylinder 21. The movable end of the hydraulic cylinder 25 passes through the top of the fixed cylinder 21 and connects to the top of the lifting block 24. Before and after pickling, when the hydraulic cylinder 25 stops, the lifting block 24 is positioned above the fixed cylinder 21.

[0030] In this embodiment, an air storage box 26 is installed between the inner wall of the pickling tank 1 near the top and the fixed cylinder 21. The air storage box 26 is provided with four lifting channels 261 for the four cleaning frames 14 to move up and down. The width of the lifting channels 261 is greater than the thickness of the cleaning frames 14. The air storage box 26 is provided with two symmetrical jet nozzles 27 at each lifting channel 261. The length of the jet nozzles 27 is slightly greater than the width of the circuit board. The mouth of each jet nozzle 27 is tilted downward. The jet nozzles 27 are connected to the air storage box 26 and an electric control valve is provided at the connection. The top of the fixed cylinder 21 is connected to multiple air guide pipes 28. The end of each air guide pipe 28 away from the fixed cylinder 21 is connected to the air storage box 26. The top of the fixed cylinder 21 is provided with an air inlet 29.

[0031] In this embodiment, each of the gas guide pipes 28 is provided with a one-way valve at one end near the fixed cylinder 21. The one-way valve in the gas guide pipe 28 only allows gas to flow from the fixed cylinder 21 to the gas storage tank 26. The fixed cylinder 21 is provided with a one-way valve at the air inlet 29. The one-way valve at the air inlet 29 only allows gas to flow from the outside to the fixed cylinder 21.

[0032] In this embodiment, the height of the lifting block 24 is half the height of the fixed cylinder 21, and the highest point of the opening on the fixed cylinder 21 is lower than half the height of the cylinder body. No matter how the lifting block 24 slides, the top of the lifting block 24 will not be lower than the highest point of the opening on the fixed cylinder 21, thus preventing the pickling liquid in the pickling tank 1 from entering the space of the fixed cylinder 21 above the lifting block 24.

[0033] The working process and principle of this invention are as follows: In use, firstly, an acidic cleaning solution is injected into the pickling tank 1 so that the liquid level is level with the top of the fixed frame 22. At this time, the lifting cylinder 11 is in the lifting state, and the cleaning frame 14 is above the pickling tank 1. The electric telescopic cylinder 342 is controlled to retract the first limiting block 321 that originally extended out of the first connecting groove 32. The robotic arm grabs the circuit board from the previous production process into the cleaning frame 14. Then, the electric telescopic cylinder 342 is controlled again to push the first limiting block 321 out. The circuit board is clamped and limited by the two first limiting blocks 321, thus completing the fixation of the circuit board.

[0034] The lifting cylinder 11 is activated, causing the cleaning frame 14 to descend into the slot 221 of the fixed frame 22, immersing the entire circuit board in the pickling solution. Then, the hydraulic cylinder 25 is activated, causing the lifting block 24 inside the fixed cylinder 21 to move up and down repeatedly. When the lifting block 24 descends, the pickling solution below the fixed cylinder 21 is squeezed, and the pickling solution flows through the four openings of the connecting cylinders 23 in four directions. At this time, the circuit board inside the cleaning frame 14 acts as a "baffle" in the pickling solution flow channel of the fixed frame 22. Under the action of hydraulic pressure, the pickling solution flows quickly to the other side through the holes on the circuit board, allowing the pickling solution to fully contact the holes on the circuit board and remove contaminants in the holes during the flow. When the lifting block 24 rises, under the action of negative pressure, the pickling solution will flow again through the circuit board towards the fixed cylinder 21. By using the reciprocating movement of the lifting block 24, the pickling solution in the pickling tank 1 flows repeatedly, which not only prevents the pickling solution from stratifying, but also allows the pickling solution to flow repeatedly around the circuit board, ensuring full contact between the circuit board and the pickling solution and improving the pickling efficiency.

[0035] During the lifting and lowering process of the lifting block 24, the liquid level of the pickling solution in the pickling tank 1 will rise as the lifting block 24 descends and fall as the lifting block 24 rises. When the lifting block 24 reaches its lowest point, the liquid level of the pickling solution in the pickling tank 1 will be higher than the height of the floating block 39 on the cleaning frame 14. The floating block 39, under the action of buoyancy, will pull the slide rod 36 upward. Through the meshing transmission between the transmission rack 37, the first gear 344, the first rack 343, the second gear 354, and the second rack 353, the first slider 341 and the second rack 353 will be driven. The two sliders 351 slide in opposite directions. The first slider 341 pulls the first limiting block 321 back into the first connecting groove 32, and the second slider 351 pushes the second limiting block 331 out, so that the second limiting block 331 replaces the first limiting block 321 to clamp and limit the circuit board, realizing the change of clamping. By changing the clamping position of the first limiting block 321 and the second limiting block 331, the clamped area on the circuit board can also come into contact with the pickling solution, avoiding the presence of pickling missed areas on the circuit board and ensuring the quality of pickling.

[0036] Simultaneously, as the lifting block 24 descends, a negative pressure will be generated inside the fixed cylinder 21 above the lifting block 24 under the action of the one-way valve. This will draw in outside air through the air inlet 29. When the lifting block 24 rises, the previously drawn air will be squeezed into the air storage tank 26 through the air guide pipe 28. Through the reciprocating rise and fall of the lifting block 24, the air storage tank 26 will be continuously filled with air. After the pickling is completed, the air storage tank 26 will have a large air pressure. When the lifting cylinder 11 lifts the cleaning frame 14 upward, the electric control valve will be opened, and the high-pressure air in the air storage tank 26 will be sprayed out through the jet nozzle 27 to blow the circuit board that passes by. The high-speed airflow will blow off the residual pickling liquid on the circuit board, reducing the impact of the residual pickling liquid on the next process of the circuit board.

[0037] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or equivalent to the scope of this invention are included in this invention.

Claims

1. A pickling device for computer circuit boards, characterized in that: It includes an acid pickling tank (1) and two lifting cylinders (11). The two lifting cylinders (11) are installed on the outside of the acid pickling tank (1). The movable ends of the two lifting cylinders (11) are connected to a connecting frame (12). Four connecting rods (13) are connected to the bottom of the connecting frame (12). The lower end of each connecting rod (13) is connected to a cleaning frame (14). The cleaning frame (14) is provided with a clamping and changing mechanism (3) for alternating the clamping parts of the circuit board. An acid pickling auxiliary mechanism (2) is provided in the acid pickling tank (1) for stirring the acid pickling solution and cleaning the residual acid pickling solution on the circuit board after acid pickling.

2. The pickling apparatus for a computer circuit board according to claim 1, characterized in that: The clamping and changing mechanism (3) includes a pair of first limiting blocks (321) and a pair of second limiting blocks (331). Cavities (31) are respectively opened on both sides of the cleaning frame (14). First connecting grooves (32) and second connecting grooves (33) are respectively opened on both sides of the inner frame of the cleaning frame (14) to communicate with the cavities (31). A pair of first limiting blocks (321) are respectively slidably connected to the two first connecting grooves (32), and a pair of second limiting blocks (331) are respectively slidably connected to the two second connecting grooves (33). A first sliding groove (34) is opened on the cavity wall of the cavity (31) to communicate with the first connecting groove (321). Two sliding grooves (35) correspond to the positions of the first connecting groove (32) and the second connecting groove (33) respectively. A first slider (341) is slidably connected in the first sliding groove (34), and a second slider (351) is slidably connected in the second sliding groove (35). An electric telescopic cylinder (342) is connected to the first slider (341). The movable end of the electric telescopic cylinder (342) is connected to the first limiting block (321). A push rod (352) is connected to the second slider (351). The end of the push rod (352) away from the second slider (351) is connected to the second limiting block (331).

3. The acid pickling device for a computer circuit board according to claim 2, characterized in that: Each cavity (31) is rotatably connected to a first gear (344) on the upper cavity wall of the first slide groove (34). A first rack (343) is connected to the first slider (341), and the first rack (343) meshes with the first gear (344). The cavity (31) is rotatably connected to a second gear (354) on the lower cavity wall of the second slide groove (35). A second rack (353) is connected to the bottom of the second slider (351), and the second rack (353) meshes with the second gear (344). The wheels (354) mesh with each other, and a slide rod (36) is slidably connected through the top of each cavity (31). A transmission rack (37) is connected to the slide rod (36). The transmission rack (37) meshes with the first gear (344) and the second gear (354) at the same time. A spring (38) is connected to the bottom of the slide rod (36). The lower end of the spring (38) is connected to the bottom cavity wall of the cavity (31). A float (39) is connected to one end of the slide rod (36) outside the cleaning frame (14).

4. The acid pickling device for a computer circuit board according to claim 3, characterized in that: The pickling auxiliary mechanism (2) includes a fixed cylinder (21) and a hydraulic cylinder (25). The fixed cylinder (21) is installed at the bottom center of the pickling tank (1). Four fixed frames (22) are connected in a ring array around the bottom of the pickling tank (1) and around the fixed cylinder (21). Each fixed frame (22) has a slot (221) at the top that matches the cleaning frame (14). The four cleaning frames (14) are distributed in a ring array around the fixed cylinder (21). Each fixed frame (22) is connected to a connecting cylinder (23) on the side near the fixed cylinder (21). The fixed cylinder (21) has four openings near the bottom that communicate with the four connecting cylinders (23). A lifting block (24) is slidably connected inside the fixed cylinder (21). The hydraulic cylinder (25) is installed at the top of the fixed cylinder (21). The movable end of the hydraulic cylinder (25) passes through the top of the fixed cylinder (21) and is connected to the top of the lifting block (24).

5. The pickling apparatus for a computer circuit board according to claim 4, characterized in that: An air storage box (26) is installed between the inner wall of the pickling tank (1) near the top and the fixed cylinder (21). The air storage box (26) is provided with four lifting channels (261) for the four cleaning frames (14) to lift and pass through. The air storage box (26) is provided with two symmetrical jet nozzles (27) at each lifting channel (261). The jet nozzles (27) are connected to the air storage box (26) and an electric control valve is provided at the connection. The top of the fixed cylinder (21) is connected to multiple air guide pipes (28). The end of each air guide pipe (28) away from the fixed cylinder (21) is connected to the air storage box (26). An air inlet (29) is opened at the top of the fixed cylinder (21).

6. The pickling apparatus for a computer circuit board according to claim 5, characterized in that: Each of the air guide tubes (28) is provided with a one-way valve at one end near the fixed cylinder (21), and the fixed cylinder (21) is provided with a one-way valve at the air inlet (29).

7. The pickling apparatus for a computer circuit board according to claim 2, characterized in that: The first limiting block (321) and the second limiting block (331) are both provided with limiting grooves for clamping and limiting the circuit board.

8. The pickling apparatus for a computer circuit board according to claim 4, characterized in that: The height of the lifting block (24) is half the height of the fixed cylinder (21), and the highest point of the opening on the fixed cylinder (21) is lower than half the height of the cylinder body.

9. The pickling apparatus for a computer circuit board according to claim 5, characterized in that: The mouth of each of the jet nozzles (27) is tilted downwards.

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