Circuit board developing mechanism

Abstract

The utility model discloses a circuit board developing mechanism and belongs to the technical field of circuit board developing. A circuit board developing mechanism comprises a machine frame and a conveying belt which is fixedly installed on the machine frame and used for conveying a circuit board, an ash cleaning box used for cleaning floating ash and a developing box used for spraying liquid medicine are sequentially installed on the machine frame in the moving direction of the conveying belt, and the circuit board developing mechanism further comprises a partition plate fixedly installed in the middle of the top wall in the developing box. Connecting plates are symmetrically arranged at the bottom of the spacing plate in a sliding mode, and limiting blocks used for clamping a circuit board are arranged on the two sets of connecting plates in a lifting mode. According to the utility model, the circuit board can be turned over in the developing process through the spacing plate, the connecting plate and the limiting block which are matched with each other and the driving of the driving piece, so that the condition of manual turning over is reduced, the condition of non-uniform contact between liquid medicine and the circuit board is avoided, the production efficiency is improved, and the production precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit board developing technology, and in particular to a circuit board developing mechanism. Background Technology

[0002] The PCB developing unit is a core automated device in the photolithography process of printed circuit board (PCB) manufacturing. Its core function is to transform the potential image formed on the photoresist coating after ultraviolet exposure into a physical circuit pattern that provides actual protection. Through a precisely controlled chemical developing process, the unit selectively dissolves specific areas of the photoresist using a specific developing solution: for negative photoresist, it dissolves the unexposed areas; for positive photoresist, it dissolves the exposed areas. In this way, the underlying copper foil areas that need to be removed by subsequent etching or thickened by electroplating are precisely exposed, while the circuit and pad patterns required by the design are preserved under the protection of the photoresist.

[0003] In the developing process, the exposed PCB board is first smoothly transported into the developing chamber. Inside the chamber, the developer, with its temperature, concentration, and pressure precisely controlled, is evenly sprayed onto the entire board surface through a spray system. The developer reacts chemically with the photoresist, dissolving the target area. Subsequently, the circuit board enters a multi-stage water washing stage, where residual developer and dissolved photoresist debris are thoroughly removed from the board surface through powerful spraying or immersion, preventing secondary contamination or crystallization that could affect quality. Finally, the thoroughly cleaned board is sent to the drying area to ensure that the board surface is completely dry and clean, with no water stains remaining.

[0004] In existing technologies, there are certain problems with the development and processing of PCB boards. On the one hand, traditional equipment is limited by the single-sided spray design. After spraying the developing solution on one side, manual operation is still required to flip the board before the other side can be processed. This step significantly increases the production cycle and restricts the overall efficiency. On the other hand, in the drying stage of the processed board, it is difficult to ensure the complete removal of water stains by relying solely on conventional air drying methods, which poses a potential risk of residue and may affect the quality of subsequent processes. Therefore, we urgently need a PCB development mechanism to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art that the spraying of chemicals is uneven and requires manual flipping when spraying both sides of the PCB board during processing, resulting in poor drying effect of the PCB board. Therefore, a circuit board developing mechanism is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A circuit board developing mechanism includes a frame and a conveyor belt fixedly mounted on the frame for transporting circuit boards. A cleaning box for removing loose dust and a developing box for spraying chemicals are sequentially mounted on the frame along the direction of the conveyor belt's movement. The mechanism further includes: a partition plate fixedly mounted in the middle of the top wall of the developing box; connecting plates symmetrically sliding on the bottom of the partition plate; and limiting blocks for clamping the circuit boards mounted on both sets of connecting plates; and a bracket fixedly mounted at the outlet of the developing box. A first cleaning roller for adsorbing water stains on the lower part of the circuit board is rotatably connected to the bracket, and a second cleaning roller for adsorbing water stains on the upper part of the circuit board is mounted on the bracket, with the second cleaning roller positioned above the first cleaning roller. When the first and second cleaning rollers are in contact with the surface of the circuit board, a cleaning area is formed.

[0008] To limit and rotate the circuit board, preferably, the bottom of the partition plate is symmetrically equipped with electric guide rails one, the output end of electric guide rails one is fixedly connected to the end of the corresponding connecting plate, when the two sets of electric guide rails one are working, the two sets of connecting plates move closer and further apart, and electric guide rails two are fixedly connected to the opposite sides of the two sets of connecting plates, the output end of electric guide rails two is fixedly connected to a mounting bracket, when electric guide rails two are working, they drive the mounting bracket to move up and down, and a drive motor one for rotating the limiting block is installed on the mounting bracket, the output end of drive motor one is fixedly installed to the limiting block, when drive motor one is working, it drives the limiting block to rotate.

[0009] To improve the clamping stability with the circuit board, the limiting block is further fixedly connected with an anti-slip pad. When the two sets of limiting blocks approach the circuit board, the anti-slip pad abuts against the side of the circuit board.

[0010] In order to drive the first cleaning roller to rotate, preferably, a second drive motor is fixedly connected to the bracket, and the output end of the second drive motor is fixedly connected to the end of the first cleaning roller located below. When the second drive motor is working, the first cleaning roller wipes the water stains on the circuit board.

[0011] To ensure that the second cleaning roller contacts the circuit board surface, preferably, rectangular frames are symmetrically installed on the inner wall of the bracket, with a screw threaded into one set of rectangular frames. A mounting seat is threaded onto the screw, and both ends of the second cleaning roller are rotatably connected to the mounting seat. When the screw rotates, the second cleaning roller moves closer to and further away from the first cleaning roller.

[0012] To further improve the water absorption effect, both the first and second cleaning rollers are made of PVA sponge.

[0013] Compared with the prior art, the present invention provides a circuit board developing mechanism, which has the following beneficial effects:

[0014] 1. This circuit board developing mechanism, through the partition plate and the corresponding connecting plate and limiting block, and with the drive of the driving component, can flip the circuit board during the developing process, reducing the need for manual flipping, avoiding uneven contact between the chemical and the circuit board, improving production efficiency and production accuracy.

[0015] 2. The circuit board developing mechanism, through the setting of cleaning roller one and cleaning roller two, can effectively wipe the surface of the circuit board after washing, avoiding the situation where water stains are difficult to remove during subsequent drying of the circuit board, thus improving the cleaning ability of the circuit board and reducing water stain residue.

[0016] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model improves production and processing efficiency, enhances the manufacturing precision of circuit board development, and improves the treatment of water stains on circuit boards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a circuit board developing mechanism proposed in this utility model.

[0018] Figure 2 This is a partial cross-sectional view of a circuit board developing mechanism proposed in this utility model.

[0019] Figure 3 The present invention proposes a structure for a circuit board developing mechanism. Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 This is a schematic diagram of the support structure of a circuit board developing mechanism proposed in this utility model;

[0021] Figure 5 This utility model proposes a circuit board developing mechanism. Figure 4 Enlarged structural diagram at point B;

[0022] Figure 6 This is a partial cross-sectional view of a circuit board developing mechanism proposed in this utility model.

[0023] In the diagram: 1. Frame; 2. Conveyor belt; 3. Cleaning box; 4. Developing box; 5. Spacing plate; 6. Connecting plate; 7. Limiting block; 8. Bracket; 9. Cleaning roller one; 10. Cleaning roller two; 11. Electric guide rail one; 12. Electric guide rail two; 13. Mounting bracket; 14. Drive motor one; 15. Anti-slip pad; 16. Drive motor two; 17. Rectangular frame; 18. Screw; 19. Mounting base. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Example:

[0027] Reference Figures 1-6 A circuit board developing mechanism includes a frame 1 and a conveyor belt 2 fixedly mounted on the frame 1 for transporting circuit boards. The conveyor belt 2 is driven by a motor, a prior art solution, and will not be described in detail here. Along the direction of movement of the conveyor belt 2, a dust removal box 3 for cleaning floating dust and a developing box 4 for spraying chemicals are sequentially installed on the frame 1. A collection box for collecting used chemicals is located on the frame 1 below the conveyor belt 2 to prevent overflow. The dust removal box 3 includes an air duct and a drive pump mounted on the frame 1. When the drive pump is activated, air is blown out through the duct to remove floating dust from the circuit boards. The circuit boards are then transported by the conveyor belt 2 into the developing box. In the developing chamber 4, there is a nozzle for spraying chemicals. The frame 1 is equipped with pipes and a pump for conveying chemicals. When the pump is driven, the chemicals are fed into the nozzles through the pipes, so that they can spray the circuit boards. This effectively achieves the cleaning of the circuit boards before processing and the spraying of chemicals, and ensures that the spraying on the surface of the circuit boards is uniform. It can also collect the used chemicals in a unified manner to avoid the phenomenon of chemical turbulence and improve the developing effect. It should be noted that the developing chamber 4 is also equipped with a nozzle for cleaning the circuit boards. The nozzle is located near the discharge end of the developing chamber 4. The nozzle is connected to an external water tank. After the circuit boards are sprayed with chemicals, the developing solution is cleaned by water washing.

[0028] It should be noted that, with the attached Figure 6 As shown, the first two sets of nozzles in a single area of ​​the developing chamber 4 are nozzles for spraying developing solution, and the last set of nozzles is a water washing nozzle.

[0029] It also includes: a partition plate 5 fixedly installed in the middle of the top wall of the developing tank 4, a connecting plate 6 symmetrically sliding on the bottom of the partition plate 5, and an electric guide rail 11 symmetrically installed on the bottom of the partition plate 5. The output end of the electric guide rail 11 is fixedly connected to the end of the corresponding connecting plate 6. When the two sets of electric guide rails 11 are working, the two sets of connecting plates 6 move closer and further away from each other. Here, the partition plate 5 divides the developing tank 4 into two areas. Both areas are provided with a developer spraying area and a water washing area. When the circuit board is transported to the developing tank 4 by the conveyor belt 2, the developer is evenly sprayed onto the circuit board by the internal nozzle through the developer spraying area. Then, the developer is cleaned on the surface of the circuit board by the water washing area. When the circuit board moves between the two sets of connecting plates 6, the electric guide rail 11 starts and drives the connecting plates 6 to move closer to each other, so that the limiting block 7 contacts the circuit board to achieve the limiting. At this time, the conveyor belt 2 is in a stopped state.

[0030] Both sets of connecting plates 6 are equipped with lifting limit blocks 7 for clamping the circuit board. Electric guide rails 12 are fixedly connected to opposite sides of both sets of connecting plates 6. A mounting bracket 13 is fixedly connected to the output end of the electric guide rails 12. When the electric guide rails 12 operate, they drive the mounting bracket 13 to move up and down. A drive motor 14 for flipping the limit blocks 7 is mounted on the mounting bracket 13. The output end of the drive motor 14 is fixedly installed with the limit blocks 7. When the drive motor 14 operates, it drives the limit blocks 7 to flip. Anti-slip pads 15 are fixedly connected to the limit blocks 7. At this point, when the circuit board stops moving, the anti-slip pads 15 on the two sets of limit blocks 7 are already abutting against the circuit board. Guide rail 2 12 drives the limit block 7 to move upward, and under the drive of drive motor 14, the circuit board on the limit block 7 is flipped. After the flipping action is completed, electric guide rail 2 12 drives the limit block 7 to move downward, and in coordination with the movement of electric guide rail 1 11 and connecting plate 6, the circuit board is brought back into contact with the conveyor belt 2. Then the conveyor belt 2 continues to run, and the circuit board enters the second area in the developing box 4. The developing agent is evenly sprayed onto the circuit board through the developing solution spraying area using internal nozzles. Then the developing solution on the surface of the circuit board is cleaned through the water washing area, thereby realizing double-sided developing of the circuit board, thus improving the processing efficiency and accuracy of the circuit board.

[0031] A bracket 8 is fixedly installed at the outlet of the developing tank 4. A cleaning roller 9 for absorbing water stains on the lower part of the circuit board is rotatably connected to the bracket 8. A drive motor 16 is fixedly connected to the bracket 8, and the output end of the drive motor 16 is fixedly connected to the end of the cleaning roller 9 located below. When the drive motor 16 works, the cleaning roller 9 wipes the water stains on the circuit board. A cleaning roller 10 for absorbing water stains on the upper part of the circuit board is raised and lowered on the bracket 8, and the cleaning roller 10 is located above the cleaning roller 9. Rectangular frames 17 are symmetrically installed on the inner wall of the bracket 8. One set of rectangular frames 17 is internally threaded with a screw 18, and a mounting base 19 is threaded onto the screw 18. Both ends of the cleaning roller 10 are rotatably connected to the mounting base 19. The cleaning roller 9 and the cleaning roller 10 are both made of PVA sponge. When screw 18 rotates, cleaning roller 2 10 moves closer to and further away from cleaning roller 1 9. When cleaning roller 1 9 and cleaning roller 2 10 are in contact with the surface of the circuit board, a cleaning zone is formed. Here, when the circuit board moves out of the developing tank 4 after being washed with water, it will pass through the cleaning zone formed by cleaning roller 1 9 and cleaning roller 2 10. Drive motor 2 16 drives cleaning roller 1 9 to rotate, so that the circuit board contacts cleaning roller 1 9 and cleaning roller 2 10 at a uniform speed. PVA sponge is used to clean water stains on the circuit board. And by rotating screw 18, the position of cleaning roller 2 10 can be adjusted, so as to adapt to circuit boards of various thicknesses, improving the adaptability of the equipment. Then, the circuit board is dried by external drying equipment, thus avoiding the situation in the past where water stains on the surface of the circuit board could not be completely removed during drying, and improving the production quality.

[0032] In this invention, the operator places the circuit board on the conveyor belt 2, then starts the conveyor belt 2, causing the circuit board to move along a predetermined path. The circuit board enters the cleaning box 3, where internal cleaning nozzles remove the floating dust adhering to it. Then, the circuit board enters the developing box 4, where it is developed and washed using developing and washing nozzles. When the circuit board reaches the spacer plate 5, the conveyor belt 2 stops, and the electric guide rail 11 starts, causing the connecting plates 6 to move closer together, bringing the limiting blocks 7 into contact with the circuit board for positioning. The anti-slip pads 15 on the two sets of limiting blocks 7 are already abutting against the circuit board. At this point, the electric guide rail 2 12 moves the limiting blocks 7 upwards, and driven by the drive motor 14, the circuit board on the limiting blocks 7 moves upwards. After the flipping action is completed, the electric guide rail 2 12 drives the limit block 7 to move downwards, and cooperates with the movement of the electric guide rail 1 11 and the connecting plate 6 to make the circuit board re-contact with the conveyor belt 2. Then the conveyor belt 2 continues to run, allowing the circuit board to enter the second area in the developing tank 4, and pass through the developing solution spraying area, where the developing agent is evenly sprayed onto the circuit board using internal nozzles. Then, the developing solution on the surface of the circuit board is cleaned by the water washing area. After the circuit board is removed from the developing tank 4, the circuit board continues to move and passes through the cleaning area formed by the cleaning roller 1 9 and the cleaning roller 2 10. The drive motor 2 16 drives the cleaning roller 1 9 to rotate, so that the circuit board contacts the cleaning roller 1 9 and the cleaning roller 2 10 at a uniform speed, and the water stains on the circuit board are cleaned by the PVA sponge.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A circuit board developing mechanism comprising a frame (1) and a conveying belt (2) fixedly installed on the frame (1) for conveying circuit boards, a dust removing box (3) for removing dust and a developing box (4) for spraying developer are installed on the frame (1) in sequence along the direction of movement of the conveying belt (2), characterized in that, Also includes: A partition plate (5) is fixedly installed in the middle of the top wall of the developing box (4). A connecting plate (6) is symmetrically slidable at the bottom of the partition plate (5). Limiting blocks (7) for clamping circuit boards are raised and lowered on both sets of connecting plates (6). A bracket (8) is fixedly installed at the outlet of the developing box (4). A first cleaning roller (9) for adsorbing water stains on the lower part of the circuit board is rotatably connected to the bracket (8). A second cleaning roller (10) for adsorbing water stains on the upper part of the circuit board is raised and lowered on the bracket (8). The second cleaning roller (10) is located above the first cleaning roller (9). When the first cleaning roller (9) and the second cleaning roller (10) are in contact with the surface of the circuit board, a cleaning area is formed.

2. The circuit board developing mechanism according to claim 1, characterized in that, Electric guide rails (11) are symmetrically installed at the bottom of the partition plate (5). The output end of the electric guide rails (11) is fixedly connected to the end of the corresponding connecting plate (6). When the two sets of electric guide rails (11) are working, the two sets of connecting plates (6) move closer and further away from each other. Electric guide rails (12) are fixedly connected to the opposite sides of the two sets of connecting plates (6). The output end of the electric guide rails (12) is fixedly connected to the mounting bracket (13). When the electric guide rails (12) are working, they drive the mounting bracket (13) to move up and down. A drive motor (14) for flipping the limit block (7) is installed on the mounting bracket (13). The output end of the drive motor (14) is fixedly installed to the limit block (7). When the drive motor (14) is working, it drives the limit block (7) to flip.

3. The circuit board developing mechanism according to claim 2, characterized in that, The limiting block (7) is fixedly connected with an anti-slip pad (15). When the two sets of limiting blocks (7) approach the circuit board, the anti-slip pad (15) abuts against the side of the circuit board.

4. The circuit board developing mechanism according to claim 1, characterized in that, The bracket (8) is fixedly connected to a second drive motor (16), and the output end of the second drive motor (16) is fixedly connected to the end of the first cleaning roller (9) located below. When the second drive motor (16) is working, the first cleaning roller (9) wipes the water stains on the circuit board.

5. A circuit board developing mechanism according to claim 1, characterized in that, The inner wall of the bracket (8) is symmetrically equipped with rectangular frames (17), one set of rectangular frames (17) is internally threaded with screws (18), and the screws (18) are threaded with mounting seats (19). Both ends of the second cleaning roller (10) are rotatably connected in the mounting seats (19). When the screws (18) rotate, the second cleaning roller (10) moves closer to and further away from the first cleaning roller (9).

6. A circuit board developing mechanism according to claim 5, characterized in that, The cleaning roller 1 (9) and cleaning roller 2 (10) are both made of PVA sponge.

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