Etching device for printed circuit board

Abstract

The utility model provides an etching device for a printed circuit board. The etching device for the printed circuit board comprises a box body, conveying frames are fixedly installed in the box body, a conveying plate is connected between the conveying frames in a sliding mode, a fixing table is arranged at the right end of the box body, and a discharging groove is formed in the right end of the box body. According to the etching device for the printed circuit board, the discharging groove, the conveying plate, the fixing table and other structures are arranged, the conveying plate can convey the circuit board from the feeding position to an etching and cleaning area under driving of the conveying frame, and finally the circuit board and the conveying plate are separated through the turning circulation section of the conveying frame; the circuit boards stably slide to the fixing table through the discharging groove to be discharged, the circuit boards are prevented from entering a turning state along with the conveying plate, physical damage to the circuit boards caused by stress is reduced, the product quality is guaranteed, silica gel pads are arranged at the upper end of the fixing table and the inner side of the baffle, the silica gel pads can play a buffering role, and the product quality is improved. The circuit board is prevented from colliding with the fixing table and the baffle, and the appearance integrity of the circuit board is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of printed circuit board preparation, and more particularly to an etching device for a printed circuit board. Background Art

[0002] Etching machines can be divided into two categories: chemical etchers and electrolytic etchers. Chemical etching uses chemical solutions to achieve the purpose of etching through chemical reactions. Automatic chemical etching machines use high-pressure spraying and linear motion of the etched plate to form a continuous and uninterrupted feeding state to etch the workpiece to improve production efficiency. Automatic chemical etching machines are widely used. Automatic chemical etching machines increase the effective area of ​​spraying and etching the metal plate and the etching uniformity, and have good etching effects and fast speeds. However, when using existing etching machines, the existing spray etching device usually places the substrate on a horizontally moving conveyor belt, and then uses the bottom and top spray devices to spray the etching liquid on the upper and lower surfaces of the substrate respectively to etch the substrate. However, as the etching process proceeds, the etching liquid on the lower surface and the upper surface of the substrate near the edge is easy to flow away, and the new and old etching liquids are easier to exchange. However, the center of the upper surface of the substrate is prone to form a "pool", which restricts the flow of etching liquid, thereby easily causing uneven etching, affecting the etching effect and quality of the circuit board. In addition, after the etching is completed, the excess etching liquid on the surface of the circuit board cannot be quickly removed in time, which easily causes the residual etching liquid to cause excessive etching of certain parts of the circuit board, affecting the etching accuracy and quality of the printed circuit board.

[0003] In response to the above problems, regarding the technical problem that a "pool" is easily formed at the center of the upper surface of the substrate, and the excess etching liquid on the surface of the circuit board cannot be quickly removed after etching, after a lot of searches, a printed circuit board etching device with patent number 202323442764.X was found, which belongs to the field of printed circuit board preparation. It includes a hollow box body, and the box body is divided by a partition into a feeding chamber located in the upper left part, an etching spray chamber located in the lower left part, a drying chamber located in the upper right part, and a cleaning spray chamber located in the lower right part; this utility model is configured to make the printed circuit board in a certain tilted state during the etching process, so that the surface of the printed circuit board can quickly flow away after the reaction, thereby preventing the occurrence of a "pool effect". However, the technical solution provided by this patent has the following problems:

[0004] The conveying mechanism is set up in an inverted triangle. During the turning process, the conveying chain on the conveying mechanism can realize the turning within the conveying mechanism. However, the circuit board itself is made of hard material. During this turning process, the circuit board is prone to collide with the edge of the conveying mechanism due to inertia and stress, resulting in damage to the corners of the circuit board. In addition, the circuit board always bends in one direction during the transportation and turning process, which can easily cause the circuit board to crack and increase the defective rate of the circuit board.

[0005] The utility model can play the role of unloading the circuit board after etching and cleaning when the circuit board is transported by the conveying mechanism through a large-scale turn, thereby preventing the circuit board from cracking and collision. Utility Model Content

[0006] The utility model aims to solve the technical problems raised by the above-mentioned background technology and provides an etching device for a printed circuit board.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an etching device for a printed circuit board, comprising: a box body, a conveying rack fixedly installed inside the box body, a transport plate slidably connected between the conveying racks, a fixed platform provided at the right end of the box body, a discharge trough provided at the right end of the box body, two liquid outlets provided below the discharge trough, the conveying rack is composed of front and rear parts, both of which are fixedly installed on the inner wall of the box body, a feed trough is provided at the upper ends of the front and rear sides of the transport plate, a limiting slot is provided inside the transport plate, the rightmost end of the limiting slot is connected to the feed trough, and the rightmost end of the limiting slot is arc-shaped, and the upper end of the fixed platform extends into the discharge trough.

[0008] A further preferred solution is that a working groove is provided inside the box body, a cover plate is provided on the upper end of the working groove, and the cover plate is shorter than the working groove, and etching pipes and clean water pipes are fixedly installed at the front and rear ends of the box body.

[0009] A further preferred solution: a plurality of nozzles are fixedly installed on the inner sides of the etching pipe and the clean water pipe at equal distances; the etching pipe and the clean water pipe on the rear side of the box are arranged above the conveying rack; and the etching pipe and the clean water pipe on the front side of the box are arranged below the conveying rack.

[0010] A further preferred solution is that a conveying trough is provided inside the conveying rack, a conveying gear is provided inside the conveying trough, output rods are provided at the four corners of the conveying rack, and a water trough is fixedly installed in the middle of the conveying rack.

[0011] A further preferred solution is that a water outlet is provided in the water tank, a water outlet pipe is fixedly connected below the water outlet, and the other end of the water outlet pipe is connected to the liquid outlet near the discharge trough.

[0012] A further preferred solution is that fixed rods are fixedly installed on both sides of the front and rear ends of the transport plate, and the surfaces of the fixed rods are rotatably connected to transmission gears, which mesh with the transmission gears provided inside the transport frame.

[0013] A further preferred solution: baffles are fixedly installed on the front and rear sides of the upper end of the fixed platform, and silicone pads are provided on the upper end of the fixed platform and the inner side of the baffle.

[0014] Beneficial effects:

[0015] 1. Etching tubes and conveyor racks are provided. According to the needs, the etching tubes on one side or both sides are opened to spray etch the circuit board. The inclined section of the conveyor rack makes the transport plate tilt downward, so that the excess etching liquid can flow away from the circuit board to avoid the accumulation of etching liquid on the circuit board. The staggered etching tube design ensures that the circuit board can fully contact the etching liquid during the conveying process.

[0016] 2. By providing the feed chute, the limit slot, and the discharge chute, when the transport plate transports the circuit board to the turning section of the conveyor rack's circulation section, the curved state of the discharge chute and the transport plate and the arc-shaped design of the limit slot allow the circuit board to gradually escape from the limit slot, thereby escaping from the transport plate and eventually entering the discharge chute. This prevents the circuit board from following the transport plate into the turning circulation section, thereby reducing the collision between the circuit board and the conveyor rack and the possibility of the circuit board bending.

[0017] 3. In summary, this etching device for printed circuit boards is provided with a discharge chute, a transport plate, a fixed table and other structures. Driven by the conveyor frame, the transport plate can quickly and accurately transport the circuit board from the feeding position to the etching and cleaning area. Finally, the circuit board and the transport plate are separated by the turning cycle section of the conveyor frame, so that the circuit board can slide smoothly through the discharge chute to the fixed table to complete the discharge, avoiding the circuit board following the transport plate into the turning state, which helps to reduce the physical damage of the circuit board caused by stress, such as bending, breaking or internal circuit damage, thereby ensuring the quality of the product. In addition, silicone pads are provided on the upper end of the fixed table and the inner side of the baffle. In the process of the circuit board sliding from the discharge to the fixed table, the silicone pad can play a buffering role, avoiding hard collision between the circuit board and the fixed table and the baffle, preventing physical damage such as edge damage and surface scratches on the circuit board, and ensuring the appearance integrity of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the box body of the present invention.

[0020] Figure 3This is a schematic diagram of the transmission structure of the present utility model.

[0021] Figure 4 This is a schematic structural diagram of a circuit board loading block of the present utility model.

[0022] Figure 1-4 In: 1. Box body; 101. Working trough; 102. Cover plate; 103. Discharge trough; 104. Liquid outlet; 105. Etching tube; 106. Clean water pipe; 107. Nozzle; 2. Conveyor rack; 201. Conveyor trough; 202. Output rod; 203. Water trough; 204. Water outlet; 205. Water outlet pipe; 3. Transport plate; 301. Feed trough; 302. Limiting groove; 303. Fixing rod; 304. Transmission gear; 4. Fixing platform; 401. Baffle; 402. Silicone pad. DETAILED DESCRIPTION

[0023] The following is a combination of the appended examples of the present invention Figures 1-4 , clearly and completely describe the technical solutions in the embodiments of the present utility model.

[0024] See also Figure 1-4In an embodiment of the present invention, an etching device for a printed circuit board comprises: a box body 1, a conveying rack 2 is fixedly installed inside the box body 1, a transport plate 3 is slidably connected between the conveying racks 2, a fixed platform 4 is provided at the right end of the box body 1, a discharge chute 103 is provided at the right end of the box body 1, and two liquid outlets 104 are provided below the discharge chute 103, the conveying rack 2 is divided into two parts, front and back, both of which are fixedly installed on the inner wall of the box body 1, a feed chute 301 is provided at the upper ends of the front and back sides of the transport plate 3, a limiting groove 302 is provided inside the transport plate 3, the rightmost end of the limiting groove 302 is connected to the feed chute 301, and the rightmost end of the limiting groove 302 is arranged in an arc shape, the upper end of the fixed platform 4 extends into the discharge chute 103, a working groove 101 is provided inside the box body 1, and the upper end of the working groove 101 A cover plate 102 is provided at the end, and the length of the cover plate 102 is smaller than the working groove 101. Etching tubes 105 and clean water pipes 106 are fixedly installed at the front and rear ends of the box body 1. Baffles 401 are fixedly installed on the front and rear sides of the upper end of the fixed platform 4. Silicone pads 402 are provided on the upper end of the fixed platform 4 and the inner side of the baffle 401. The printed circuit board to be etched can be placed in the box body 1 through the gap between the cover plate 102 and the working groove 101, and placed in the limiting groove 302 through the feeding groove 301 on the upper ends of the front and rear sides of the transport plate 3. The output of the external motor enables the conveying rack 2 to move the transport plate 3 in the conveying rack 2, and the conveying rack 2 is divided into several parts, namely, a downward inclined section, a stable buffer section, and the remaining end is a circulation section of the transport plate 3. The downwardly inclined section is within the working range of the etching tube 105. When the transport plate 3 arrives here, the etching tube 105 etches the circuit board on the transport plate 3. The transport plate 3 continues to move to the right and enters the buffer section. At this time, the clean water pipe 106 works to spray and rinse the circuit board to rinse the excess etching liquid from the circuit board. The buffer section and the inclined section both have a certain inclination. Therefore, during etching and cleaning, the etching liquid will react with the circuit board and the clean water will flow away from the circuit board after cleaning the residual etching liquid on the circuit board. It will not accumulate on the circuit board and will be discharged outward through the liquid outlet 104. When the conveyor frame 2 transports the transport plate 3 to the turning part of the circulation section of the transport plate 3, the right side of the transport plate 3 After the transport plate 3 passes through the turn first, the transport plate 3 is in a curved shape, and the feed chute 301 gradually bends and opens. At this time, the limiting slot 302 gradually bends as the transport plate 3 moves, and the restriction of its right end on the circuit board gradually decreases. Through the arc design of the right end of the limiting slot 302, the circuit board gradually slides outward, and as the transport plate 3 continues to move, the feed chute 301 is fully expanded to ninety degrees, and the right end of the limiting slot 302 no longer limits the circuit board. Under the action of gravity, the circuit board will completely break away from the transport plate 3 and fall into the discharge chute 103. It will slide briefly to the fixed platform 4 through the discharge chute 103 and finally stay on the fixed platform 4 to complete the discharge, so that the circuit board will not follow the transport plate 3 into the turning state, reducing the possibility of the circuit board bending and cracking.In addition, a silicone pad 402 is provided on the upper end of the fixing table 4 and the inner side of the baffle 401, so that the circuit board is effectively protected from damage during the unloading process when it contacts the fixing table 4.

[0025] In the embodiment of the present invention, a plurality of nozzles 107 are fixedly installed on the inner sides of the etching tube 105 and the clean water pipe 106 at equal distances. The etching tube 105 and the clean water pipe 106 on the rear side of the box body 1 are arranged above the conveying rack 2, and the etching tube 105 and the clean water pipe 106 on the front side of the box body 1 are arranged below the conveying rack 2. A water tank 203 is fixedly installed in the middle part of the conveying rack 2, and a water outlet 204 is provided in the water tank 203. A water outlet pipe 205 is fixedly connected below the water outlet 204, and the other end of the water outlet pipe 205 is connected to the liquid outlet 104 near the discharge trough 103. When etching the circuit board, if only one side needs to be etched, it is only necessary to open the etching tube 105 on one side to make it enter the working state, and the etching liquid is sprayed from the nozzle 107 to etch the circuit board; if it is necessary to etch both sides of the circuit board, the etching tubes 105 on both sides are opened at the same time, and the etching liquid is sprayed from the nozzle 107 to etch the circuit board. The circuit board is sprayed with etching liquid to etch the upper and lower surfaces of the circuit board. Then, the circuit board continues to be conveyed forward. When passing through the cleaning pipe 106, clean water is sprayed from the nozzle 107 to clean the circuit board and rinse out the residual etching liquid. This staggered layout allows the circuit board to be fully exposed to the etching liquid and clean water during the conveyance process. After that, part of the excess etching liquid and clean water in the spraying process will fall down into the water tank 203, and part will fall out of the water tank 203 due to collision with the circuit board. The liquid in the water tank 203 flows to the liquid outlet 104 near the discharge trough 103 through the water outlet 204 and the water outlet pipe 205. The water is discharged by the water pipe connected to the outside, and the liquid falling in the box 1 is discharged outward through another liquid outlet 104, ensuring that the liquid in the box 1 and the water outlet trough 203 can be discharged outward, avoiding liquid accumulation in the device and affecting the etching and cleaning effects.

[0026] In the embodiment of the present invention, a conveying groove 201 is opened inside the conveying frame 2, and a conveying gear is arranged inside the conveying groove 201. Output rods 202 are arranged at the four corners of the conveying frame 2. Fixed rods 303 are fixedly installed on the left and right sides of the front and rear ends of the transport plate 3. The surfaces of the fixed rods 303 are rotatably connected with transmission gears 304. The transmission gear 304 is engaged with the conveying gear arranged inside the conveying frame 2. The conveying groove 201 opened inside the conveying frame 2 provides space for the installation and operation of the conveying gear. The output rod is connected to an external motor, reducer and other equipment to transmit power to the conveying gear, so that the conveying gear can rotate in the conveying groove 201, and the transmission gear is engaged with the transmission gear 304 on the transport plate 3 to realize the driving of the transport plate 3, so that the transport plate 3 can be driven to move in the conveying frame 2 to complete a series of etching, cleaning and discharging work.

[0027] Working principle: When etching of the circuit board is required, the printed circuit board to be etched is placed into the box body 1 through the gap between the cover plate 102 and the working groove 101, and then placed into the limiting groove 302 through the feed groove 301 at the upper ends of the front and rear sides of the transport plate 3. Then, one-side or two-side etching tubes 105 are opened as needed, and the etching liquid is sprayed from the nozzle 107 to etch the circuit board. When the transport reaches the inclined section of the downward conveyor rack 2, the etching work is carried out within the working range of the etching tube 105. After that, the transport plate 3 continues to move to the right and enters the buffer section of the conveyor rack 2. The clean water pipe 106 enters The circuit board is put into work and sprayed to rinse the excess etching liquid. Then when the transport plate 3 reaches the turning part of the circulation section of the conveyor rack 2, the feed trough 301 gradually bends and opens, and the restriction of the right end of the limit groove 302 on the circuit board gradually decreases. The circuit board is separated from the transport plate 3 under the action of gravity, falls on the discharge trough 103, and then slides to the fixed table 4 to complete the discharge. During the etching process, the excess etching liquid and clean water fall down to the water tank 203 and the bottom of the box 1, and are finally discharged by the liquid outlet 104, avoiding excessive accumulation of liquid in the box 1 and the water tank 203, resulting in poor etching and cleaning effects.

Claims

1. An etching device for a printed circuit board, comprising: A box body (1) is provided, wherein a conveying rack (2) is fixedly installed inside the box body (1), a transport plate (3) is slidably connected between the conveying racks (2), and a fixed platform (4) is provided at the right end of the box body (1), characterized in that: a discharge trough (103) is provided at the right end of the box body (1), two liquid outlets (104) are provided below the discharge trough (103), the conveying rack (2) is divided into two parts, front and rear, both of which are fixedly installed on the inner wall of the box body (1), a feed trough (301) is provided at the upper ends of the front and rear sides of the transport plate (3), a limiting groove (302) is provided inside the transport plate (3), the rightmost end of the limiting groove (302) is connected to the feed trough (301), and the rightmost end of the limiting groove (302) is arranged in an arc shape, and the upper end of the fixed platform (4) extends into the discharge trough (103).

2. The etching device for a printed circuit board according to claim 1, characterized in that: A working groove (101) is provided inside the box body (1), a cover plate (102) is provided at the upper end of the working groove (101), and the length of the cover plate (102) is shorter than that of the working groove (101), and etching pipes (105) and clean water pipes (106) are fixedly installed at the front and rear ends of the box body (1).

3. The etching device for a printed circuit board according to claim 2, characterized in that: Several nozzles (107) are fixedly installed at equal distances on the inner side surfaces of the etching tube (105) and the clean water tube (106); the etching tube (105) and the clean water tube (106) on the rear side of the box body (1) are arranged above the conveying rack (2); and the etching tube (105) and the clean water tube (106) on the front side of the box body (1) are arranged below the conveying rack (2).

4. The etching device for a printed circuit board according to claim 1, wherein: A conveying trough (201) is provided inside the conveying frame (2), a conveying gear is provided inside the conveying trough (201), output rods (202) are provided at the four corners of the conveying frame (2), and a water trough (203) is fixedly installed in the middle of the conveying frame (2).

5. The etching device for a printed circuit board according to claim 4, characterized in that: A water outlet (204) is provided in the water trough (203), a water outlet pipe (205) is fixedly connected below the water outlet (204), and the other end of the water outlet pipe (205) is connected to the liquid outlet (104) close to the discharge trough (103).

6. The etching device for a printed circuit board according to claim 1, characterized in that: Fixed rods (303) are fixedly installed on both the front and rear ends and the left and right sides of the transport plate (3), and the surfaces of the fixed rods (303) are rotatably connected to transmission gears (304), which are engaged with transmission gears provided inside the transport frame (2).

7. The etching device for a printed circuit board according to claim 1, characterized in that: Baffles (401) are fixedly mounted on the front and rear sides of the upper end of the fixing platform (4), and silicone pads (402) are provided on the upper end of the fixing platform (4) and the inner side of the baffle (401).

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