PCB etching device and etching method

Abstract

The invention belongs to the technical field of PCB etching, and discloses a PCB etching device and an etching method. The PCB etching device comprises an etching machine which is provided with a spraying device and is used for spraying etching liquid; the connecting seat is connected to the etching machine, and a blocking assembly is arranged on the connecting seat; the conveying device is arranged on the connecting seat and the etching machine and is used for conveying the PCB; the limiting device is arranged in the etching machine and is used for limiting the PCB; the limiting device comprises a mounting block arranged in the etching machine; and the adjusting and limiting assembly is arranged above the conveying device. According to the utility model, the to-be-etched PCBs can be separated through the blocking mechanism and sequentially enter the etching machine to be etched, and meanwhile, the PCBs are limited through the electric telescopic plate, so that the stability of the PCBs during conveying and spraying is improved, and the phenomena that the PCBs shake and shake, etching liquid cannot be uniformly sprayed, etching is not uniform, and the consistency of the etching effect is influenced are prevented.

Description

Technical Field

[0001] The present invention belongs to the technical field of PCB etching, and in particular relates to a PCB etching device and an etching method. Background Art

[0002] PCB circuit boards are important electronic components, supporting electronic components and serving as the carrier for the electrical interconnection of electronic components. PCB etching involves etching away the unprotected, non-conductive copper on the patterned circuit board produced in the previous process to form circuits. The workpiece to be etched (e.g., a PCB board, on which the circuit sections to be retained are protected with an anti-etching layer through processes such as photolithography, while the remaining copper foil to be etched is exposed) is placed on an etching machine and moved into the working area via a driven transmission system. The etching liquid in the etching machine is continuously circulated through a spray system and a circulation system, ensuring that the acidic etching liquid is in full contact with the workpiece surface. Under certain temperature (usually around 40°C-60°C) and concentration conditions, the etching liquid reacts chemically with the exposed copper foil on the workpiece, gradually dissolving the unnecessary copper foil, thereby achieving etching formation of the circuit pattern.

[0003] However, in the prior art, the PCB board is moved to the working area through a conveyor system for spray etching. When the etching machine is in operation, the conveyor device is unstable, which causes the PCB board to shake and vibrate. The etching liquid cannot be sprayed evenly to various parts of the board, resulting in uneven etching and affecting the consistency of the etching effect. Summary of the Invention

[0004] The present invention aims to solve the problems in the prior art and proposes the following technical solutions:

[0005] A PCB etching device, comprising:

[0006] The etching machine is provided with a spraying device for spraying etching liquid;

[0007] A connecting seat is connected to the etching machine, and a blocking component is provided on the connecting seat;

[0008] A conveying device is provided on the connecting seat and the etching machine, and is used to convey the PCB board;

[0009] A limiting device is provided in the etching machine and is used to limit the PCB board;

[0010] Restricted devices include:

[0011] A mounting block is provided in the etching machine;

[0012] An adjustment and limiting component is arranged above the conveying device;

[0013] The gear drive assembly is arranged in the mounting block and is used to drive the adjustment and limiting assembly to move.

[0014] As a preferred embodiment of the above technical solution, the adjustment and limiting component includes:

[0015] Two electrically operated retractable plates are mounted on the gear drive assembly;

[0016] A first driving member is connected to the electric telescopic plate and is used to drive the electric telescopic plate to move;

[0017] The first driving member close to the connecting seat is connected to the gear driving assembly through a fixing block, and the first driving member far from the connecting seat is connected to the gear driving assembly through a fixing block and a connecting block.

[0018] As a preferred embodiment of the above technical solution, the transmission device includes:

[0019] A conveying roller is rotatably arranged on the connecting seat and the etching machine;

[0020] The rollers are connected to the conveying rollers and are distributed on the conveying rollers in a linear array.

[0021] As a preferred embodiment of the above technical solution, a mounting groove is provided on the connecting seat, and the blocking components are located in the mounting groove. There are two groups of blocking components, and they are symmetrically arranged with respect to the center of the connecting seat.

[0022] As a preferred embodiment of the above technical solution, the blocking component includes:

[0023] a second driving member connected to the mounting slot;

[0024] a rotating baffle, sleeved on the rotating shaft of the second driving member, for controlling the distance between the PCB boards;

[0025] The rotating wheel is rotatably arranged at the bottom of the rotating baffle.

[0026] As a preferred embodiment of the above technical solution, the electric telescopic plate, the first driving member and the fixed block are all located on the top of the roller, and a support assembly is provided between the electric telescopic plate and the fixed block for supporting and limiting the electric telescopic plate.

[0027] As a preferred embodiment of the above technical solution, the support assembly includes:

[0028] A first telescopic rod connected to the fixed block;

[0029] A movable plate connected between the electric telescopic plate and the first telescopic rod;

[0030] The moving block is slidably arranged on one side of the fixed block, and a support plate is hingedly arranged between the moving block and the moving plate;

[0031] The connecting piece is arranged on the movable plate and the electric telescopic plate.

[0032] As a preferred embodiment of the above technical solution, the connecting member includes two fixed plates and a second telescopic rod, the two fixed plates are respectively connected to the movable plate and the electric telescopic plate, and the second telescopic rod is connected between the two fixed plates.

[0033] The present invention also provides an etching method using the above-mentioned PCB etching device, comprising the following steps:

[0034] Step 1: Place multiple PCBs to be etched on a conveyor and move them into the etcher through the conveyor. When one PCB moves into the etcher, the blocking assembly blocks the multiple PCBs to be etched outside the etcher. The first drive member and the electric telescopic plate then move to both sides of the PCB to limit the PCBs. The spray device is then started to spray onto the PCBs for etching.

[0035] Step 2: When the PCB board moves into the etching machine and moves between the electric telescopic plates, the first driving member is started to drive the electric telescopic plates to move to both sides of the PCB board, and at the same time drives the support mechanism to move, supporting and limiting the electric telescopic plates and the first driving member;

[0036] Step 3: When the PCB board moves toward one end of the etching machine outlet, the two first driving members and the electric telescopic plate are moved close to each other to the center of the etching tank through the gear drive assembly, so that the first driving member and the electric telescopic plate close to the connecting seat no longer limit the PCB board, and at the same time, the first driving member and the electric telescopic plate away from the connecting seat are started to limit the PCB board, and the PCB board is continued to be sprayed by the spray device, and the gear drive assembly is started again to make the PCB board between the electric telescopic plates away from the connecting seat move to the outside of the etching machine along with the conveyor;

[0037] Step 4: After the etched PCB board is moved out of the etching machine, the gear drive structure moves the electric telescopic plate to its original position, and then the blocking component continues to intermittently block the PCB board, separating the PCB boards inside and outside the etching machine, and then enter the etching machine for etching in turn.

[0038] The beneficial effects of the present invention are:

[0039] (1) The present invention can separate the PCB boards to be etched by a blocking mechanism, and sequentially enter the etching machine for etching. At the same time, the PCB boards are limited by an electric telescopic plate, thereby improving the stability of the PCB boards during transmission and spraying, preventing the PCB boards from shaking and jittering, which would cause the etching liquid to be sprayed unevenly, resulting in uneven etching and affecting the consistency of the etching effect;

[0040] (2) The present invention supports and limits the electric telescopic plate and the first driving member through a supporting mechanism, thereby improving the stability of the electric telescopic plate when limiting the PCB board, preventing the electric telescopic plate from shaking during spraying, thereby affecting the effect of limiting the PCB board, and improving the etching effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 What is shown is a schematic diagram of the overall structure of the embodiment;

[0042] Figure 2 Shown is a structural diagram of an embodiment etching machine;

[0043] Figure 3 Shown is a diagram of the internal structure of an etching machine according to an embodiment;

[0044] Figure 4 Shown is a structural diagram of a blocking assembly according to an embodiment;

[0045] Figure 5 Shown is a structural diagram of an embodiment defining an apparatus;

[0046] Figure 6 Shown is Figure 5 A magnified view of point A;

[0047] Figure 7 Shown is a diagram of the internal structure of the mounting block of an embodiment;

[0048] Figure 8 Shown is Figure 7 Enlarged view of point B;

[0049] Figure 9 Shown is a structural diagram of the first driving member, the electric telescopic plate and the supporting mechanism of the embodiment.

[0050] In the figure: 1. Etching machine; 2. Spraying device; 3. Connecting seat; 4. Mounting block; 5. Electric telescopic plate; 6. First driving member; 7. Fixed block; 8. Connecting block; 9. Conveyor roller; 10. Roller; 11. Second driving member; 12. Rotating baffle; 13. Rotating wheel; 14. First telescopic rod; 15. Moving plate; 16. Moving block; 17. Support plate; 18. Third driving member; 19. Gear; 20. First rack; 21. Second rack; 22. Fixed plate; 23. Second telescopic rod. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0052] The present invention provides a PCB etching device, such as Figures 1 to 4As shown, it includes an etching machine 1, a spray device 2, a connecting seat 3, a blocking component, a conveying device and a limiting device. An etching tank is provided in the etching machine 1, and a spray device 2 is provided in the etching tank for spraying etching liquid. The connecting seat 3 is fixedly connected to one side of the etching machine 1, and the etching machine 1 has an inlet on one side close to the connecting seat 3 and an outlet on the other side. A blocking component is provided on the connecting seat 3, and an installation groove is provided on the connecting seat 3. The blocking component is located in the installation groove. There are two groups of blocking components, and they are symmetrically arranged with the center of the connecting seat 3. The blocking component facilitates the orderly entry of the PCB board to be etched into the etching machine 1 for etching. The conveying device is provided on the connecting seat 3 and the etching machine 1 for conveying the PCB board. The spray device 2 is symmetrically arranged on the upper and lower sides of the conveying device, which is convenient for spraying the upper and lower sides of the PCB board at the same time. The conveying device includes a conveying roller 9 and a roller 10. The two ends of the conveying roller 9 are respectively rotatably arranged on the connecting seat 3 and the etching machine 1 In the etching tank, the roller 10 is fixedly connected to the conveying roller 9. The conveying roller 9 and the roller 10 are located on the connecting seat 3 and the etcher 1 in a linear array, which is convenient for moving the PCB board to be etched into the etching tank for etching. The limiting device is arranged in the etcher 1, and the limiting device is located at the top of the conveying device. There are two groups of limiting devices, and they are symmetrically arranged with the center of the etcher 1, which are used to limit the PCB board. In order to improve the stability of the PCB board during spraying, the limiting device includes a mounting block 4, an adjustment limiting component and a gear drive component. The mounting block 4 is arranged in the etcher 1, and fixed grooves are provided on both sides of the inner wall of the etching tank. The mounting block 4 is fixedly installed with the fixed groove. The adjustment limiting component is arranged above the conveying device, and the gear drive component is arranged in the mounting block 4 for driving the adjustment limiting component to move. The adjustment limiting component is symmetrically arranged at both ends of the gear drive component to prevent the PCB board from shaking and jittering during conveying and spraying.

[0053] A plurality of PCB boards to be etched are placed on the conveying roller 9 and the roller 10, and the PCB boards to be etched are moved into the interior of the etching machine 1 by the conveying roller 9 and the roller 10. When a PCB board moves into the interior of the etching machine 1, the blocking component is started at the same time and moves from the mounting groove to the conveying roller 9 and the roller 10 to block the PCB boards to be etched outside the etching machine 1, and then the limiting component is moved to both sides of the PCB board for limiting, and then the spray device 2 is started to spray onto the PCB board for etching. When the PCB board moves toward the exit direction of the etching machine 1 along with the conveying roller 9 and the roller 10, the gear drive component is started at the same time so that the limiting components at both ends of the gear drive component are simultaneously adjusted. Move toward the center of the etcher 1. When the two adjustment and limiting components move to the center of the etcher 1, restart the adjustment and limiting component close to the connecting seat 3 to no longer limit the PCB board, so that the adjustment and limiting component away from the connecting seat 3 continues to limit the PCB board, and the spray etching is continued through the spray device 2. Then continue to start the gear drive component to make the two adjustment and limiting components move away from each other and move to their original positions, thereby making the adjustment and limiting component away from the connecting seat 3 and the PCB board move from the exit to the outside of the etcher 1 along with the conveying roller 9 and the roller 10, and then continue to intermittently block the PCB board through the blocking component to separate the PCB boards inside and outside the etcher 1, and enter the etcher 1 in turn for etching.

[0054] like Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 As shown, in order to limit the PCB board inside the etching machine 1 and prevent the PCB board from shaking and jittering during spraying, which makes the spraying uneven and affects the etching effect, the adjustment and limiting component includes two electric telescopic plates 5 and a first driving member 6. The two electric telescopic plates 5 are arranged on the gear drive assembly. The electric telescopic plates 5 are located above the conveying roller 9 and the roller 10. The first driving member 6 is fixedly connected to the electric telescopic plate 5. The first driving member 6 is symmetrically arranged at both ends of the electric telescopic plate 5 and is used to push the electric telescopic plate 5 to move. The first driving member 6 close to the connecting seat 3 is connected to the gear drive assembly through the fixed block 7, and the first driving member 6 away from the connecting seat 3 is connected to the gear drive assembly through the fixed block 7 and the connecting block 8.

[0055] The gear drive assembly includes a third drive member 18, a gear 19, a first rack 20 and a second rack 21. The third drive member 18 is fixedly mounted on the inner wall of the mounting block 4. One end of the output shaft of the third drive member 18 is fixedly connected to the gear 19, and the other end is rotatably connected to the inner wall of the mounting block 4. One side of the gear 19 is engaged with the first rack 20, and the other side is engaged with the second rack 21. The bottoms of the first rack 20 and the second rack 21 are both slidably connected to the inner wall of the mounting block 4. One side of the fixed block 7 is fixedly mounted on one side of the first rack 20, and both ends of the connecting block 8 are respectively connected to the second rack 21 and the fixed block 7.

[0056] In this embodiment, the first driving member 6 can be an electric push rod, and the third driving member 18 can be a motor. When a PCB board moves to the inside of the etching machine 1, the first driving member 6 close to the connecting seat 3 is started to drive the electric telescopic plate 5 to move to the side of the PCB board, so that the electric telescopic plate 5 is extended to fit the PCB board, and at the same time, the third driving member 18 is started to drive the gear 19 to rotate, so that the first rack 20 and the second rack 21 move close to each other and move to the center of the etching machine 1, so that the first rack 20 drives the fixed block 7 close to the connecting seat 3, the first driving member 6 and the electric telescopic plate 5 to move along the conveying direction of the conveying roller 9 and the roller 10, so that the PCB board moves to the center of the etching machine 1 after being limited. At this time, the first driving member 6 and the electric telescopic plate 5 away from the connecting seat 3 are under the action of the second rack 21, the connecting block 8 and the fixed block 7. The first driving member 6 and the electric telescopic plate 5 move to the outside of the etcher 1 along with the conveying roller 9 and the roller 10, so that the etched PCB board moves out of the etcher 1 for further subsequent processing.

[0057] like Figures 3 and 4As shown, in order to separate the PCB boards to be etched and enter the etching machine 1 for etching in sequence, maintain stable transportation, and improve the etching effect of the PCB boards, the blocking assembly includes a second driving member 11, a rotating baffle 12 and a rotating wheel 13. The second driving member 11 is fixedly connected to the mounting groove. The second driving member 11 is fixedly connected to the rotating baffle 12 through a rotating shaft, and is used to control the distance between the PCB boards. A plurality of rotating grooves are provided at the bottom of the rotating baffle 12, and the rotating wheel 13 is rotatably connected to the rotating grooves. The rotating wheel 13 is located at the bottom of the rotating baffle 12 and is distributed in a linear array. The rotating baffle 12 and the rotating wheel 13 are located in the mounting groove. The rotating baffle 12, the rotating wheel 13 and the conveying roller 9 are vertically arranged, and the distance between adjacent rotating wheels 13 is the same as the distance between adjacent rollers 10.

[0058] In this embodiment, the second driving member 11 can be a motor. When a PCB board enters the interior of the etching machine 1, the second driving member 11 is started at the same time to drive the rotating shaft and the rotating baffle 12 to rotate, so that the rotating baffle 12 drives the rotating wheel 13 to rotate, and rotates from the mounting groove to above the conveying roller 9 and the roller 10, so that the rotating baffle 12, the rotating wheel 13 and the conveying roller 9 and the roller 10 are kept in a horizontal state. At the same time, the rotating wheel 13 corresponds to and contacts the roller 10, and their surfaces are not absolutely smooth, so that friction is generated on the contact surface between the roller 10 and the rotating wheel 13. When the roller 10 rotates, a tangential force is applied to the rotating wheel 13 in contact with it, driving the rotating wheel 13 to rotate along the mounting frame 15 at the bottom of the rotating baffle 12, thereby blocking the PCB board outside the etching machine 1 on the connecting seat 3, and at the same time, the conveying roller 9 and the roller 10 can continue to rotate, and the PCB board inside the etching machine 1 is conveyed to facilitate spray etching.

[0059] like Figures 6 to 9As shown, in order to support and limit the electric telescopic plate 5 and the first driving member 6 and improve the stability of the electric telescopic plate 5 when limiting the PCB board, the electric telescopic plate 5, the first driving member 6 and the fixed block 7 are all located on the top of the roller 10, and a support assembly is provided between the electric telescopic plate 5 and the fixed block 7 for supporting and limiting the electric telescopic plate 5. The support assembly includes a first telescopic rod 14, a movable plate 15, a movable block 16, a support plate 17 and a connecting member. The first telescopic rod 14 is fixedly connected to one side of the fixed block 7, the movable plate 15 is fixedly connected between the electric telescopic plate 5 and the telescopic block, and the movable block 16 is slidably connected to the side of the fixed block 7 close to the first telescopic rod 14. The moving block 16 is hinged to one end of the support plate 17, and the other end of the support plate 17 is hinged to the moving plate 15. The moving block 16, the support plate 17, the moving plate 15 and the first telescopic rod 14 are all located between the two first driving members 6. The connecting member is provided on the moving plate 15 and the electric telescopic plate 5. The connecting member includes two fixed plates 22 and a second telescopic rod 23. The two fixed plates 22 are fixedly connected to the moving plate 15 and the electric telescopic plate 5, respectively. The second telescopic rod 23 is fixedly connected between the two fixed plates 22. The two fixed plates 22 are used to facilitate the connection of the second telescopic rod 23 with the electric telescopic plate 5, which facilitates the limitation of the electric telescopic plate 5 and improves stability.

[0060] When the first driving member 6 pushes the electric telescopic plate 5 to extend, the electric telescopic plate 5 drives the movable plate 15 to move, so that the first telescopic rod 14 extends, and at the same time, the support plate 17 deflects and drives the movable block 16 to move along one side of the fixed block 7. The fixed end of the electric telescopic plate 5 is supported and limited by the action of the support plate 17. When the electric telescopic plate 5 moves downward to the side of the PCB board, it drives the fixed plate 22 connected to the electric telescopic plate 5 to move, so that the second telescopic rod 23 extends, and then the telescopic end of the electric telescopic plate 5 is limited, so that both the upper and lower ends of the electric telescopic plate 5 are limited, which is convenient for improving the stability of the electric telescopic plate 5 in limiting the PCB board and is convenient for use.

[0061] The present invention also provides an etching method using the above-mentioned PCB etching device, comprising the following steps:

[0062] Step 1: Place multiple PCB boards to be etched on a conveyor and move them into the interior of the etcher 1 through the conveyor. When one PCB board moves into the interior of the etcher 1, the blocking component blocks the multiple PCB boards to be etched outside the etcher 1. Then, the first driving member 6 and the electric telescopic plate 5 move to both sides of the PCB board to limit the PCB board, and the spray device 2 is started to spray the PCB board for etching.

[0063] Step 2: When the PCB board moves into the etching machine 1 and moves between the electric telescopic plates 5, the first driving member 6 drives the electric telescopic plates 5 to move to both sides of the PCB board, and at the same time drives the supporting mechanism to move, supporting and limiting the electric telescopic plates 5 and the first driving member 6;

[0064] Step 3: When the PCB board moves toward one end of the outlet of the etching machine 1, the two first driving members 6 and the electric telescopic plate 5 are moved close to each other to the center of the etching tank through the gear drive assembly, so that the first driving member 6 and the electric telescopic plate 5 close to the connecting seat 3 no longer limit the PCB board, and at the same time, the first driving member 6 and the electric telescopic plate 5 away from the connecting seat 3 are started to limit the PCB board, and the PCB board is continued to be sprayed by the spray device 2, and the gear drive assembly is started again to make the PCB board between the electric telescopic plates 5 away from the connecting seat 3 move to the outside of the etching machine 1 along with the conveying device;

[0065] Step 4: After the etched PCB board moves out of the etching machine 1, the gear drive assembly moves the electric telescopic plate 5 to its original position, and then the blocking assembly continues to intermittently block the PCB board, separating the PCB boards inside and outside the etching machine 1, and then enter the etching machine 1 in turn for etching.

[0066] Working principle: When in use, multiple PCB boards to be etched are placed on the conveying roller 9 and the roller 10, and the PCB boards to be etched are moved into the inside of the etching machine 1 through the conveying roller 9 and the roller 10. When a PCB board moves into the inside of the etching machine 1, the second driving member 11 is started to drive the rotating shaft 12 and the rotating baffle 12 to rotate, so that the rotating baffle 12 drives the mounting frame 15 and the rotating wheel 13 to rotate from the mounting groove to above the conveying roller 9 and the roller 10, so that the rotating baffle 12, the rotating wheel 13 and the conveying roller 9 and the roller 10 are kept horizontal. At the same time, the rotating wheel 13 corresponds to and contacts each other with the roller 10, and their surfaces are not absolutely smooth, so that friction is generated on the contact surface between the roller 10 and the rotating wheel 13. When the roller 10 rotates, it will apply a tangential force to the rotating wheel 13 in contact with it, driving the rotating wheel 13 to rotate along the mounting frame 15 at the bottom of the rotating baffle 12, and then on the connecting seat 3 to the PCB board on the outside of the etching machine 1 When the electric telescopic plate 5 is extended, the first driving member 6 drives the electric telescopic plate 5 to move to both sides of the PCB board to limit the PCB board. When the first driving member 6 pushes the electric telescopic plate 5 to extend, the electric telescopic plate 5 drives the movable plate 15 to move, so that the first telescopic rod 14 extends, and at the same time, the support plate 17 deflects and drives the movable block 16 to move along one side of the fixed block 7. The fixed end of the electric telescopic plate 5 is supported and limited by the action of the support plate 17. When the electric telescopic plate 5 moves downward to both sides of the PCB board, the fixed plate 22 connected to the electric telescopic plate 5 is driven to move, so that the second telescopic rod 23 extends, thereby limiting the telescopic end of the electric telescopic plate 5, so that the upper and lower ends of the electric telescopic plate 5 are limited, and then the spraying device 2 is started to spray onto the PCB board for etching.

[0067] Restart the third driving member 18 to drive the gear 19 to rotate, and the first rack 20 and the second rack 21 move close to each other and move to the center of the etching machine 1, so that the first rack 20 drives the fixed block 7 close to the connecting seat 3, the first driving member 6 and the electric telescopic plate 5 to move along the transmission direction of the conveying roller 9 and the roller 10, thereby making the PCB move to the center of the etching machine 1 while limiting the spraying. At this time, the first driving member 6 and the electric telescopic plate 5 away from the connecting seat 3 move to the center of the etching machine 1 under the action of the second rack 21, the connecting block 8 and the fixed block 7, and then the electric telescopic plate 5 is retracted, and the first driving member 6 close to the connecting seat 3 drives the electric telescopic plate 5 to retract away from the PCB board , so that the first driving member 6 away from the connecting seat 3 drives the electric telescopic plate 5 to move to the side of the PCB board, and the electric telescopic plate 5 is extended to limit the PCB board, and then through the action of the third driving member 18 and the movable rod 21, the gear 19 drives the first rack 20 and the second rack 21 to move away from each other to the original position, and then the electric telescopic plate 5 close to the connecting seat 3 moves to the entrance, and the first driving member 6 and the electric telescopic plate 5 away from the connecting seat 3 drive the PCB board to move from the exit to the outside of the etching machine 1 along with the conveying roller 9 and the roller 10, and then continue to intermittently block the PCB board through the blocking component, separating the PCB boards inside and outside the etching machine 1, and enter the etching machine 1 in turn for etching.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A PCB etching device, characterized in that: include: An etching machine (1) is provided with a spraying device (2) for spraying etching liquid; A connecting seat (3) is connected to the etching machine (1), and a blocking component is provided on the connecting seat (3); A conveying device, arranged on the connecting seat (3) and the etching machine (1), and used for conveying PCB boards; A limiting device, arranged in the etching machine (1), for limiting the PCB board; The limiting device comprises: A mounting block (4) is disposed in the etching machine (1); An adjustment and limiting component is arranged above the conveying device; A gear drive assembly is arranged in the mounting block (4) and is used to drive the adjustment and limiting assembly to move.

2. The PCB etching device according to claim 1, characterized in that: The adjustment limiting component includes: Two electric telescopic plates (5) are arranged on the gear drive assembly; A first driving member (6) is connected to the electric telescopic plate (5) and is used to push the electric telescopic plate (5) to move; The first driving member (6) close to the connecting seat (3) is connected to the gear driving assembly via a fixing block (7), and the first driving member (6) away from the connecting seat (3) is connected to the gear driving assembly via the fixing block (7) and the connecting block (8).

3. The PCB etching device according to claim 2, characterized in that: The transmission device comprises: A conveying roller (9) is rotatably arranged on the connecting seat (3) and the etching machine (1); The rollers (10) are connected to the conveying rollers (9), and the rollers (10) are located on the conveying rollers (9) and distributed in a linear array.

4. The PCB etching device according to claim 3, characterized in that: The connecting seat (3) is provided with a mounting groove, and the blocking components are located in the mounting groove. There are two groups of blocking components, and they are symmetrically arranged around the center of the connecting seat (3).

5. The PCB etching device according to claim 4, characterized in that: The blocking assembly comprises: A second driving member (11) is connected to the mounting groove; A rotating baffle (12) is sleeved on the rotating shaft of the second driving member (11) and is used to control the distance between the PCB boards; The rotating wheel (13) is rotatably arranged at the bottom of the rotating baffle (12).

6. The PCB etching device according to claim 5, characterized in that: The electric telescopic plate (5), the first driving member (6) and the fixed block (7) are all located on top of the roller (10), and a support assembly is provided between the electric telescopic plate (5) and the fixed block (7) for supporting and limiting the electric telescopic plate (5).

7. The PCB etching device according to claim 6, characterized in that: The support assembly comprises: A first telescopic rod (14) connected to the fixed block (7); A movable plate (15) connected between the electric telescopic plate (5) and the first telescopic rod (14); A moving block (16) is slidably arranged on one side of the fixed block (7), and a support plate (17) is hingedly arranged between the moving block (16) and the moving plate (15); A connecting piece is provided on the movable plate (15) and the electric telescopic plate (5).

8. An etching method using the PCB etching device according to claim 7, characterized in that: The following steps are involved: Step 1: placing a plurality of PCB boards to be etched on a conveying device, and moving the PCB boards to the inside of the etching machine (1) through the conveying device; when the first PCB board moves into the inside of the etching machine (1), the blocking component blocks the plurality of PCB boards to be etched outside the etching machine (1); then the first driving member (6) and the electric telescopic plate (5) are moved to both sides of the PCB board to limit the PCB board; and the spraying device (2) is started to spray the PCB board for etching; Step 2: When the PCB board moves into the etching machine (1) and moves between the electric telescopic plates (5), the first driving member (6) is started to drive the electric telescopic plates (5) to move to both sides of the PCB board, and at the same time drives the supporting mechanism to move, thereby supporting and limiting the electric telescopic plates (5) and the first driving member (6); Step 3: When the PCB board moves toward one end of the outlet of the etching machine (1), the two first driving members (6) and the electric telescopic plate (5) are moved closer to each other to the center of the etching tank through the gear drive assembly, so that the first driving member (6) and the electric telescopic plate (5) close to the connecting seat (3) no longer limit the PCB board, and at the same time, the first driving member (6) and the electric telescopic plate (5) away from the connecting seat (3) are started to limit the PCB board, and the PCB board is continued to be sprayed by the spraying device (2), and the gear drive assembly is started again to move the PCB board between the electric telescopic plates (5) away from the connecting seat (3) to the outside of the etching machine (1) along with the conveying device; Step 4: After the etched PCB board moves out of the etching machine (1), the electric telescopic plate (5) is moved to its original position by the gear drive assembly, and then the blocking assembly continues to intermittently block the PCB board, separating the PCB boards inside and outside the etching machine (1), and then the PCB boards enter the etching machine (1) in turn for etching.

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