Automatic control flow device for FPC circuit forming wet pressing film

Abstract

The application discloses a FPC line forming wet pressure film wet pressure automatic control flow device, which comprises a water pressure gauge, the water pressure gauge is communicated with an external water source, and the other end of the water pressure gauge is communicated with a filter core. The combination of the three-way pipe and the first electric valve realizes closed-loop control of pipeline pressure, wherein the normally open first electric valve is responsible for water supply of the main passage, the normally closed first electric valve is in standby state, the water pressure gauge monitors the front end pressure in real time, when detecting that the pressure is reduced, the normally closed valve is automatically triggered to open to perform pressure compensation operation, meanwhile, the second electric valve in the half-open state is arranged on the connecting pipe, the filtered liquid is continuously delivered to the standby tank body for storage without affecting the liquid supply amount of the buffer tank, when the water pressure gauge detects that the pressure is zero, the third electric valve is started in linkage with the pressure pump, and the reserved liquid in the standby tank body is reversely delivered to the connecting pipe, so that the continuity of the spraying operation can be maintained when the main water source is interrupted.

Description

Technical Field

[0001] This invention relates to the field of FPC circuit processing technology, specifically to an automatic flow control device for wet pressing and film forming of FPC circuits. Background Technology

[0002] In the manufacturing process of flexible printed circuit boards (FPCs), the quality of dry film adhesion before circuit formation directly determines the accuracy of subsequent circuit etching. Wet lamination is a key process. Its principle involves uniformly coating a layer of deionized water onto the surface of the FPC product to be laminated. Then, hot-press rollers tightly adhere the dry film to the water-coated surface. Utilizing the fluidity of the dry film and the foaming effect generated when the deionized water contacts the dry film, the height differences in the plated vias and blind holes are effectively filled, thus eliminating air and preventing wrinkles or poor adhesion of the dry film.

[0003] For example, patent application number 201010575195.4 published on the China Patent Network, entitled "Circuit Board Film Applying Equipment and Circuit Board Wet Film Applying Method," includes a film applying machine; wherein, a humidifying device is provided in front of the film applying machine; the humidifying device includes a body and a top cover, and along the board entry direction, a pressure roller component, a water spraying device, and a water-absorbing cotton roller component are sequentially arranged in the inner cavity of the body; the top cover covers the pressure roller component, the water spraying device, and the water-absorbing cotton roller component; the pressure roller component includes an upper pressure roller and a lower pressure roller, and the gap between the upper pressure roller and the lower pressure roller is the board entry gap; the water spraying device includes upper and lower water spray pipes, and the water spray pipes have evenly distributed drainage holes; the water-absorbing cotton roller component includes an upper water-absorbing wheel and a lower water-absorbing wheel, which are respectively opposite to the upper and lower water spray pipes of the water spraying device, and the upper and lower water-absorbing wheels are fixed in the body of the body by a bracket.

[0004] However, in actual production, the main technical challenge in the wet pressing and film application process lies in the stable control of water flow. Traditional wet pressing equipment typically uses a manual ball valve in conjunction with a mechanical flow meter to control the spray water volume. This control method has the following significant drawbacks:

[0005] Manual adjustment cannot respond to changes in pipeline water pressure in real time. When the water pressure is too high, excessive water spray can cause the dry film to over-foam, resulting in blurred edges of the circuit pattern or even wet pressure short circuit; when the water pressure is too low, insufficient water spray can cause the dry film to fail to completely fill the groove, resulting in wet pressure gaps or broken wires.

[0006] The filtration devices in the system are mostly single-channel fixed types. As the usage time increases, filter clogging will lead to a decrease in flow rate, and the machine must be shut down when replacing the filter, which seriously affects the equipment's uptime.

[0007] Secondly, when the external water pressure drops to zero or is interrupted, the system has no emergency reserve, causing the entire batch of products to be scrapped due to lack of water pressure.

[0008] Finally, the existing method mainly relies on the operator's experience to manually adjust the flow rate, which is difficult to standardize. This leads to large fluctuations in yield rates for different machines and at different times, which usually results in a higher rate of defective circuit quality.

[0009] Therefore, it is necessary to design and modify the automatic flow control device for wet pressing of FPC circuit forming. Summary of the Invention

[0010] To address the problems mentioned in the background section, the present invention aims to provide an automatic flow control device for wet pressing of FPC circuit molding film, which features redundancy and non-stop maintenance, solving the problem that manual adjustment cannot respond in real time to changes in pipeline water pressure. When the water pressure is too high, excessive water spray can easily lead to over-foaming of the dry film, causing blurred edges of the circuit pattern or even wet pressing short circuits; when the water pressure is too low, insufficient water spray can cause the dry film to fail to completely fill the grooves, resulting in wet pressing gaps or broken lines.

[0011] To achieve the above objectives, the present invention provides the following technical solution: an automatic flow control device for wet pressing of FPC circuit forming film, including a water pressure gauge;

[0012] The pressure gauge is connected to an external water source. A filter element is connected to the other end of the pressure gauge. A connecting pipe is connected to the end of the filter element away from the pressure gauge. A buffer tank is connected to the other end of the connecting pipe. Electric ball valves are connected to both sides of the buffer tank. An ultrasonic flow meter is connected to the output end of the electric ball valve. A spray pipe is connected to the output end of the ultrasonic flow meter. Several nozzles are connected to the surface of the spray pipe.

[0013] As a preferred embodiment of the present invention, the input end of the water pressure gauge is connected to a three-way pipe, and both output ends of the three-way pipe are connected to a first electric valve. One of the first electric valves is kept in a normally open state, and the other first electric valve is kept in a normally closed state. When the water pressure gauge detects a decrease in pressure, it can control the other first electric valve to open for pressure replenishment.

[0014] As a preferred embodiment of the present invention, a spare tank is provided on the back side of the connecting pipe, and a second electric valve is connected to the surface of the connecting pipe. The output end of the second electric valve is connected to the spare tank. The second electric valve is kept in a half-open or slightly open state, so as to transport the liquid filtered by the filter element to the interior of the spare tank without affecting the liquid supply of the buffer tank.

[0015] As a preferred embodiment of the present invention, the top of the spare tank is connected to a pressure pump, the input end of the pressure pump is connected to the spare tank, the output end of the pressure pump is connected to a third electric valve, the output end of the third electric valve is connected to a connecting pipe, the third electric valve is kept in a normally closed state, and when the pressure gauge detects that the pressure is zero, the third electric valve and the pressure pump open to input the liquid inside the spare tank into the connecting pipe for use.

[0016] In a preferred embodiment of the present invention, a bracket is fixedly connected to the top of the spare tank, and a shaft is movably connected to the side of the bracket away from the tank. Connecting plates are fixedly connected to both sides of the shaft surface, and flanges are connected to both ends of the connecting plates. The filter element is installed inside the flange. When the filter element connected to the connecting pipe is blocked, the shaft can rotate the connecting plate and replace the connected filter element. A fourth electric valve located in front of the third electric valve and the second electric valve is connected to the surface of the connecting pipe. The fourth electric valve is kept in a normally open state and automatically closes during the filter element replacement process.

[0017] As a preferred embodiment of the present invention, a support plate is fixedly connected to the surface of the spare tank, a drive motor is fixedly connected to the bottom of the support plate, a worm is fixedly connected to the output end of the drive motor, and a worm wheel located on the back of the worm is fixedly connected to the left end of the shaft, and the worm wheel and the worm mesh with each other.

[0018] In a preferred embodiment of the present invention, a crossbeam is fixedly connected to the top of the spare tank. The side of the crossbeam away from the tank extends to the top of the filter element. A dual-axis cylinder is fixedly connected to the surface of the crossbeam. A transmission plate sleeved on the surface of the connecting pipe is fixedly connected to both output ends of the dual-axis cylinder. A chuck is fixedly connected to the inner side of the transmission plate. The side of the chuck away from the transmission plate extends to the inner side of the flanges at both ends of the filter element. When the dual-axis cylinder extends, the transmission plate can carry the chuck to extend outward and tightly press the flanges at both ends of the filter element onto the surface of the connecting pipe.

[0019] In a preferred embodiment of the present invention, the electric ball valve, ultrasonic flow meter, first electric valve, second electric valve, third electric valve, fourth electric valve, drive motor, and dual-shaft cylinder are all electrically connected via a control circuit.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. This invention achieves closed-loop control of pipeline pressure through a combination of a three-way pipe and a first electric valve. The normally open first electric valve is responsible for supplying water to the main channel, while the normally closed first electric valve is in standby mode. A water pressure gauge monitors the upstream pressure in real time. When a pressure drop is detected, the normally closed valve is automatically triggered to open for pressure replenishment. Simultaneously, a second electric valve in a semi-open state is installed on the connecting pipe to continuously transport the filtered liquid to the backup tank for storage without affecting the liquid supply from the buffer tank. When the water pressure gauge detects zero pressure, a third electric valve is activated in conjunction with the pressure pump to reverse the flow of the stored liquid in the backup tank to the connecting pipe. This maintains the continuity of spraying operations when the main water source is interrupted, solving the problem of dry film foaming or insufficient filling caused by manual adjustment failing to respond in real time to changes in pipeline water pressure. It is suitable for production environments with extremely high requirements for water pressure stability in the wet pressing process of FPC circuit molding.

[0022] 2. This invention achieves rapid filter element switching through the fixed connection between the flanges at both ends of the filter element and the connecting plate. A shaft passes through the bracket and connects two symmetrically arranged connecting plates. A working filter element and a spare filter element are respectively installed at both ends of the connecting plate. A drive motor drives the worm wheel at the left end of the shaft to rotate via a worm gear, thereby causing the two sets of filter elements to interchange positions by 180 degrees. During filter element replacement, the fourth electric valve automatically closes to cut off the fluid in the main pipeline. The pressure pump in the spare tank and the third electric valve open synchronously to provide temporary liquid supply. A dual-shaft cylinder drives the chucks to extend outwards via the transmission plate, tightly pressing the flanges at both ends of the new filter element against the surface of the connecting pipe to achieve a seal. This ensures that the filter element replacement operation is completed without fluid leakage, realizing the non-stop maintenance function of the FPC wet pressing equipment.

[0023] 3. This invention achieves precise flow control through the coordinated operation of a buffer tank and an ultrasonic flow meter. The liquid filtered by the filter element first enters the buffer tank to eliminate fluid pulsation and stabilize pressure. Subsequently, the liquid flows out from both sides of the buffer tank and passes through an electric ball valve and an ultrasonic flow meter, respectively. The ultrasonic flow meter detects the flow data in real time and feeds it back to the control circuit. The control circuit adjusts the opening of the electric ball valve according to the flow deviation to achieve quantitative spraying. Multiple nozzles arranged on the surface of the spray pipe evenly cover the FPC board surface with liquid. When the water pressure is too high, the ultrasonic flow meter detects the excessive flow and closes the electric ball valve to prevent excessive foaming of the dry film. When the water pressure is too low, the electric ball valve opens wider to ensure that the dry film completely fills the grooves, avoiding blurred edges of the circuit pattern or wet pressure gaps.

[0024] 4. This invention achieves fully automated operation by integrating an electric ball valve, an ultrasonic flow meter, first to fourth electric valves, a drive motor, and a dual-shaft cylinder into a unified control circuit. The pressure signal detected by the water pressure gauge, the flow signal detected by the ultrasonic flow meter, and the on / off status of each valve are all transmitted to the control circuit in real time. The control circuit sequentially controls each actuator according to preset logic. When the external water pressure is normal, the system maintains the normal liquid supply mode. When the pressure is abnormal, it automatically switches to the backup liquid supply mode. When the filter element is clogged, it automatically executes the filter element replacement procedure. The entire device can complete the entire process from constant pressure water supply and emergency backup to non-stop maintenance without manual intervention, effectively improving the yield rate and production continuity of FPC circuit molding. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0027] Figure 3 This is a partial structural diagram of the present invention;

[0028] Figure 4 This is a rear view schematic diagram of a partial structure of the present invention;

[0029] Figure 5 This is a schematic front view of a partial structure of the present invention;

[0030] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle.

[0031] In the diagram: 1. Water pressure gauge; 2. Filter element; 3. Connecting pipe; 4. Buffer tank; 5. Electric ball valve; 6. Ultrasonic flow meter; 7. Spray pipe; 8. Spray head; 9. T-pipe; 10. First electric valve; 11. Spare tank; 12. Second electric valve; 13. Pressure pump; 14. Third electric valve; 15. Bracket; 16. Shaft; 17. Connecting plate; 18. Flange; 19. Fourth electric valve; 20. Support plate; 21. Drive motor; 22. Worm gear; 23. Worm wheel; 24. Crossbeam; 25. Dual-shaft cylinder; 26. Transmission plate; 27. Claw. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1 to 6 As shown, this invention provides an automatic flow control device for wet pressing of FPC circuit molding film. This device provides a constant and controllable water pressure environment for the FPC wet pressing process. By integrating dual water supply, emergency reserve, automatic filter cartridge switching, and flow closed-loop feedback functions, it achieves automatic compensation of pipeline pressure and precise flow control, effectively preventing dry film foaming or insufficient filling, and significantly improving the yield and production continuity of FPC circuit molding. The device consists of a constant pressure filtration system composed of a pressure gauge 1, filter cartridge 2, connecting pipe 3, and buffer tank 4; an emergency backup system composed of a spare tank 11, pressure pump 13, and first to fourth electric valves 10, 12, 14, and 19; an automatic filter cartridge replacement system composed of a bracket 15, shaft 16, drive motor 21, and dual-shaft cylinder 25; and a precise flow control system composed of an electric ball valve 5, ultrasonic flow meter 6, and spray pipe 7. The various systems work closely together through a control circuit.

[0034] The water pressure gauge 1 is the sensing and input terminal of this device, and it is connected to an external water source for real-time monitoring of water supply pressure. The input terminal of the water pressure gauge 1 is connected to a three-way pipe 9, and both output terminals of the three-way pipe 9 are connected to a first electric valve 10. One of the first electric valves 10 is kept in a normally open state as the main passage, and the other first electric valve 10 is kept in a normally closed state as a backup pressure replenishment passage. When the water pressure gauge 1 detects a decrease in pressure, it can control the other first electric valve 10 to open for pressure replenishment.

[0035] The other end of the pressure gauge 1 is connected to a filter element 2, and the end of the filter element 2 away from the pressure gauge 1 is connected to a connecting pipe 3. The other end of the connecting pipe 3 is connected to a buffer tank 4, which is used to eliminate fluid pulsation and stabilize pressure. Both sides of the buffer tank 4 are connected to electric ball valves 5, the output end of the electric ball valves 5 is connected to an ultrasonic flow meter 6, the output end of the ultrasonic flow meter 6 is connected to a spray pipe 7, and several nozzles 8 are connected to the surface of the spray pipe 7.

[0036] A spare tank 11 is located on the back of the connecting pipe 3. A second electric valve 12 is connected to the surface of the connecting pipe 3. The output end of the second electric valve 12 is connected to the spare tank 11. The second electric valve 12 is kept half-open or slightly open, allowing the liquid filtered by the filter element 2 to be transported to the interior of the spare tank 11 for storage without affecting the liquid supply of the buffer tank 4. A pressure pump 13 is connected to the top of the spare tank 11. A third electric valve 14 is connected to the output end of the pressure pump 13. The output end of the third electric valve 14 is connected to the connecting pipe 3. The third electric valve 14 is normally closed. When the pressure gauge 1 detects that the pressure has returned to zero, the third electric valve 14 and the pressure pump 13 open to input the liquid inside the spare tank 11 into the connecting pipe 3 for use.

[0037] A bracket 15 is fixedly connected to the top of the spare tank 11. A shaft 16 is movably connected to the side of the bracket 15 away from the tank. Connecting plates 17 are fixedly connected to both sides of the surface of the shaft 16. Flanges 18 are connected to both ends of the connecting plates 17. The filter element 2 is installed inside the flanges 18. A support plate 20 is fixedly connected to the surface of the spare tank 11. A drive motor 21 is fixedly connected to the bottom of the support plate 20. A worm gear 22 is fixedly connected to the output end of the drive motor 21. A worm wheel 23 located on the back of the worm gear 22 is fixedly connected to the left end of the shaft 16. The worm wheel 23 and the worm gear 22 mesh with each other, thereby driving the shaft 16 to rotate and realize the switching of the filter element 2.

[0038] A crossbeam 24 is fixedly connected to the top of the spare tank 11. The side of the crossbeam 24 away from the tank extends to the top of the filter element 2. A dual-axis cylinder 25 is fixedly connected to the surface of the crossbeam 24. A transmission plate 26 sleeved on the surface of the connecting pipe 3 is fixedly connected to the two output ends of the dual-axis cylinder 25. A claw 27 is fixedly connected to the inner side of the transmission plate 26. The side of the claw 27 away from the transmission plate 26 extends to the inner side of the flanges 18 at both ends of the filter element 2. A fourth electric valve 19 located in front of the third electric valve 14 and the second electric valve 12 is connected to the surface of the connecting pipe 3. The fourth electric valve 19 is kept in the normally open state and automatically closes during the replacement of the filter element 2.

[0039] The working principle and usage process of this invention are as follows: During operation, the external water source is first connected through the three-way pipe 9. At this time, the first electric valve 10, which is normally open, is activated, and the water flows through the pressure gauge 1 into the filter element 2 for filtration. The filtered liquid flows through the connecting pipe 3 into the buffer tank 4 to smooth out pulsations. Subsequently, the liquid in the buffer tank 4 flows out through the electric ball valves 5 on both sides, and after the flow rate is accurately measured by the ultrasonic flow meter 6, it enters the spray pipe 7 and is finally sprayed evenly by the nozzle 8. During this process, the pressure gauge 1 monitors the pipeline pressure in real time. When a pressure drop is detected, it automatically controls the other first electric valve 10, which is normally closed, to open to replenish the pressure and ensure a constant water supply pressure. At the same time, the second electric valve 12 on the connecting pipe 3 is in a half-open or slightly open state, and without affecting the main liquid supply, a portion of the filtered liquid is transported to the backup tank 11 for storage in case of emergency. Once the external water source fails and the pressure gauge 1 detects zero pressure, the system immediately opens the third electric valve 14 and starts the pressure pump 13 to extract the stored liquid in the backup tank 11 and transport it back to the connecting pipe 3. Maintain spraying to prevent production interruptions due to water shortage; in addition, when the ultrasonic flow meter 6 detects an abnormal flow indicating that the filter element 2 is clogged, the system automatically triggers the filter element replacement procedure. The fourth electric valve 19 on the connecting pipe 3 quickly closes to isolate the main pipeline, while the third electric valve 14 and the pressure pump 13 open to provide backup liquid. Subsequently, the dual-shaft cylinder 25 installed on the top of the backup tank 11 actuates, driving the pawl 27 to release the flange 18 via the transmission plate 26. Then, the drive motor 21 drives the worm wheel 23 and the shaft 16 to rotate via the worm gear 22. Rod 16 drives connecting plate 17 to rotate and move the clogged filter element 2 out of the working position, while simultaneously rotating and docking the spare filter element 2 into place. Dual-axis cylinder 25 then actuates again to fasten the flange 18 of the new filter element 2 onto the connecting pipe 3 via claw 27. The fourth electric valve 19 reopens to restore water supply. The entire process is coordinated by the control circuit to operate the electric ball valve 5, ultrasonic flow meter 6, first to fourth electric valves 19, drive motor 21, and dual-axis cylinder 25 synchronously, realizing fully automated closed-loop control from constant pressure water supply and emergency backup to non-stop maintenance.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic flow control device for wet pressing of FPC circuit forming film, including a water pressure gauge (1). Its features are: The water pressure gauge (1) is connected to an external water source. The other end of the water pressure gauge (1) is connected to a filter element (2). The end of the filter element (2) away from the water pressure gauge (1) is connected to a connecting pipe (3). The other end of the connecting pipe (3) is connected to a buffer tank (4). Both sides of the buffer tank (4) are connected to electric ball valves (5). The output end of the electric ball valve (5) is connected to an ultrasonic flow meter (6). The output end of the ultrasonic flow meter (6) is connected to a spray pipe (7). The surface of the spray pipe (7) is connected to several nozzles (8).

2. The automatic flow control device for wet pressing and film forming of FPC circuits according to claim 1, characterized in that: The input end of the water pressure gauge (1) is connected to a three-way pipe (9), and both output ends of the three-way pipe (9) are connected to a first electric valve (10). One of the first electric valves (10) is kept in a normally open state, and the other first electric valve (10) is kept in a normally closed state. When the water pressure gauge (1) detects a decrease in pressure, it can control the other first electric valve (10) to open for pressure replenishment.

3. The automatic flow control device for wet pressing and film forming of FPC circuits according to claim 2, characterized in that: A spare tank (11) is provided on the back of the connecting pipe (3). A second electric valve (12) is connected to the surface of the connecting pipe (3). The output end of the second electric valve (12) is connected to the spare tank (11). The second electric valve (12) is kept half open or slightly open. The liquid filtered by the filter element (2) is transported to the interior of the spare tank (11) without affecting the liquid supply of the buffer tank (4).

4. The automatic flow control device for wet pressing and film forming of FPC circuits according to claim 3, characterized in that: The top of the spare tank (11) is connected to a pressure pump (13). The input end of the pressure pump (13) is connected to the spare tank (11). The output end of the pressure pump (13) is connected to a third electric valve (14). The output end of the third electric valve (14) is connected to the connecting pipe (3). The third electric valve (14) is normally closed. When the pressure gauge (1) detects that the pressure is zero, the third electric valve (14) and the pressure pump (13) are opened to input the liquid inside the spare tank (11) into the connecting pipe (3) for use.

5. The automatic flow control device for wet pressing and film forming of FPC circuits according to claim 4, characterized in that: The top of the spare tank (11) is fixedly connected to a bracket (15). The bracket (15) is movably connected to a shaft (16) on the side away from the tank. Both sides of the shaft (16) are fixedly connected to connecting plates (17). Both ends of the connecting plates (17) are connected to flanges (18). The filter element (2) is installed inside the flange (18). When the filter element (2) connected to the connecting pipe (3) is blocked, the shaft (16) can rotate the connecting plate (17) and replace the connected filter element (2). The surface of the connecting pipe (3) is connected to a fourth electric valve (19) located at the front end of the third electric valve (14) and the second electric valve (12). The fourth electric valve (19) is kept in the normally open state. During the replacement of the filter element (2), the fourth electric valve (19) automatically closes.

6. The automatic flow control device for wet pressing and film forming of FPC circuits according to claim 5, characterized in that: A support plate (20) is fixedly connected to the surface of the spare tank (11). A drive motor (21) is fixedly connected to the bottom of the support plate (20). A worm (22) is fixedly connected to the output end of the drive motor (21). A worm wheel (23) located on the back of the worm (22) is fixedly connected to the left end of the shaft (16). The worm wheel (23) and the worm (22) mesh with each other.

7. The automatic flow control device for wet pressing and film forming of FPC circuits according to claim 6, characterized in that: A crossbeam (24) is fixedly connected to the top of the spare tank (11). The side of the crossbeam (24) away from the tank extends to the top of the filter element (2). A dual-axis cylinder (25) is fixedly connected to the surface of the crossbeam (24). A transmission plate (26) sleeved on the surface of the connecting pipe (3) is fixedly connected to both output ends of the dual-axis cylinder (25). A claw (27) is fixedly connected to the inner side of the transmission plate (26). The side of the claw (27) away from the transmission plate (26) extends to the inner side of the flanges (18) at both ends of the filter element (2). When the dual-axis cylinder (25) extends, it can use the transmission plate (26) to carry the claw (27) to extend outward and tightly press the flanges (18) at both ends of the filter element (2) onto the surface of the connecting pipe (3).

8. The automatic flow control device for wet pressing and film forming of FPC circuits according to claim 7, characterized in that: The electric ball valve (5), ultrasonic flow meter (6), first electric valve (10), second electric valve (12), third electric valve (14), fourth electric valve (19), drive motor (21) and dual-shaft cylinder (25) are all electrically connected through a control circuit.

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