Maintenance-free circuit board film-removing liquid filtering device

Abstract

The utility model provides a maintenance-free circuit board film-removing liquid filtering device which comprises a magnetic pump I and a centrifugal cylinder, wherein the centrifugal cylinder is positioned above the magnetic pump I; the first magnetic pump is connected with the liquid medicine box, and the centrifugal barrel is connected with an outlet of the first magnetic pump through a pipeline and used for separating film residues and film removing liquid in suspension liquid; the centrifugal cylinder comprises an upper cylinder body, a lower cylinder body, a liquid inlet pipe, a water discharge pipe and a slag discharge port, a liquid outlet of the liquid inlet pipe extends into the upper cylinder body and is tangentially arranged along the inner circumferential wall of the upper cylinder body, the lower end of the water discharge pipe extends into the upper cylinder body and crosses the liquid outlet of the liquid inlet pipe, and a joint connected with the slag discharge pipe is arranged on the slag discharge port. The centrifugal cylinder is adopted for centrifugal separation and filtration, the filtration speed is high, maintenance is basically avoided, and the operation safety is improved; and the temporary storage tank and the cotton core filter are combined for multi-stage filtering, so that the filtering effect is good, and the film removing device is suitable for conventional circuit board film removing and can also be suitable for film removing of fine circuit boards.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board manufacturing, in particular to a maintenance-free circuit board film removal liquid filtering device. Background Art

[0002] The production of circuit boards usually adopts the process of substrate dry film → exposure → development → etching → film removal. Among them, film removal is one of the core processes of the circuit board wet process. Its working principle is to use a special film removal liquid to remove the film layer (etching resist layer) that protects the copper surface to reveal the circuit pattern. The film removal liquid reacts chemically with the exposed film layer on the circuit board surface to make it fall off. The fallen film residue is mixed with the film removal liquid to form a suspension. In order to recycle and reuse the film removal liquid, a filtering device is generally used to filter and remove the film residue in the film removal liquid.

[0003] The filtering device of the traditional defilming section generally adopts bag type, cotton core or filter screen type filtering. Due to the large amount of filter residue in defilming, the traditional filtering method has limited filtering capacity and slow filtering speed. The defilming liquid after filtration is not suitable for defilming of fine circuit boards. It also needs frequent maintenance and replacement of filter elements, etc. The maintenance frequency is high, otherwise it will be unusable due to blockage by membrane residue, and the machine needs to be shut down for maintenance, which affects production efficiency. In addition, the defilming liquid is toxic, and manual maintenance will increase the possibility of work-related injuries. Utility Model Content

[0004] The utility model aims to provide a maintenance-free circuit board film removal liquid filtering device to overcome the shortcomings of the prior art.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a maintenance-free circuit board demembrane liquid filtering device, comprising a base frame, a magnetic pump 1, and a centrifugal cylinder, wherein the magnetic pump 1 is fixed on the bottom plate inside the base frame, and the centrifugal cylinder is fixed on the top plate of the base frame and is located above the magnetic pump 1; the magnetic pump 1 is connected to a medicine water tank for collecting suspension liquid provided on the demembrane equipment, and the centrifugal cylinder is connected to the outlet of the magnetic pump 1 through a pipeline, and is used for centrifugally separating the membrane residue and the suspension liquid. Demembraning liquid; the centrifugal cylinder includes a cylinder body, a liquid inlet pipe, a drainage pipe, and a slag discharge port. The cylinder body includes a cylindrical upper cylinder body and a conical lower cylinder body. The liquid inlet pipe is arranged at the upper end of the upper cylinder body, and the liquid outlet of the liquid inlet pipe extends into the interior of the upper cylinder body and is arranged tangentially along the inner peripheral wall of the upper cylinder body. The drainage pipe is arranged at the top of the upper cylinder body, and its lower end is provided with an extended convex pipe extending to the interior of the upper cylinder body and crossing the liquid inlet pipe liquid outlet. The slag discharge port is arranged at the bottom of the lower cylinder body, and a joint for connecting the slag discharge pipe is provided on the slag discharge port. The bottom of the chassis is provided with foot pads and universal wheels, which can be easily moved and transported, and has good flexibility.

[0006] Furthermore, in the above-mentioned maintenance-free circuit board membrane removal liquid filtering device, a plurality of centrifugal cylinders are provided and connected in series along the flow direction of the liquid medicine.

[0007] Furthermore, in the above-mentioned maintenance-free circuit board demembraning liquid filtration device, the centrifugal cylinder located upstream is arranged below the centrifugal cylinder located downstream, that is, the multiple centrifugal cylinders are distributed in steps extending upward along the flow direction of the liquid medicine, and the drain pipe of the upstream centrifugal cylinder is connected to the liquid inlet pipe of the downstream centrifugal cylinder by a right-angle connecting pipe.

[0008] Furthermore, the above-mentioned maintenance-free circuit board demembraning liquid filtration device also includes a temporary storage tank arranged downstream of the centrifuge cylinder, which is connected to the drain pipe of the centrifuge cylinder through a pipeline and is used to precipitate the liquid discharged from the centrifuge cylinder. An overflow port is provided at the upper end of the temporary storage tank, and the overflow port is connected to the medicine tank through a pipeline.

[0009] Furthermore, the above-mentioned maintenance-free circuit board demembrane liquid filtering device also includes at least two cotton core filters, multiple cotton core filters are connected in parallel, and one of the cotton core filters is a redundant filter for backup, the inlet at the bottom of the cotton core filter is connected to the liquid extraction port at the lower end of the temporary storage tank through a pipe, and the outlet at the upper end of the cotton core filter is connected to the demembrane module on the demembrane equipment through a pipe.

[0010] Furthermore, in the above maintenance-free circuit board demembrane liquid filtering device, an air valve is provided on the inlet pipe of each cotton core filter, and a pressure gauge and an electric valve are also provided on the outlet pipe of each cotton core filter. The outlet pressure of the cotton core filter is detected by the pressure gauge, and the electric valve controls its valve opening according to the detected pressure to ensure the best filtering effect; in addition, when the electric valve is fully opened and still cannot meet the pressure requirement, it means that the cotton core filter is clogged and needs to be replaced, and the water inlet air valve of the clogged cotton core filter is closed, and the spare cotton core filter is started at the same time to ensure that the equipment does not stop working.

[0011] Furthermore, in the above-mentioned maintenance-free circuit board defilming liquid filtering device, the lower end of the temporary storage tank is arranged at the liquid outlet, and a second magnetic pump is arranged on the connecting pipeline of the liquid outlet.

[0012] Furthermore, in the above-mentioned maintenance-free circuit board defilming liquid filtering device, a liquid level sensor group is provided in the temporary storage tank, and the liquid level sensor group is electrically connected to the first magnetic pump and the second magnetic pump.

[0013] Furthermore, in the above-mentioned maintenance-free circuit board demembraning liquid filtration device, the top plate of the base frame is stepped, a temporary storage tank is provided on the lower top plate of the base frame, a centrifugal cylinder and a cotton core filter are provided on the upper top plate of the base frame, and multiple cotton core filters are arranged side by side with the temporary storage tank, and the magnetic pump 2 is also fixed on the bottom plate inside the base frame.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: a centrifugal cylinder is used for preliminary filtration, and a temporary storage tank is used to precipitate the membrane removal liquid filtered by the centrifugal cylinder. The centrifugal cylinder has a large filtration capacity and a fast filtration speed, and there is no filter screen inside, no need to drive, and no parts that need to be disassembled for maintenance. The structure is simple, the operation is convenient, and it is basically maintenance-free, which improves the filtration efficiency and the operation safety. A plurality of cotton core filters are used for fine filtration, and the number of cotton core filters to be used can be freely switched according to the pressure flow, and the cotton core can be replaced and repaired without stopping work, and the operation is simple and convenient. The utility model uses a centrifugal cylinder, a temporary storage tank, and a cotton core filter for multi-stage filtration, and has a good filtration effect and high filtration efficiency. It can not only adapt to conventional circuit board membrane removal, but also adapt to fine circuit board membrane removal, and has a wide range of adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the structure of the maintenance-free circuit board membrane removal liquid filtering device of the utility model;

[0017] Figure 2 It is a partial schematic diagram of the maintenance-free circuit board defilming liquid filtering device of the utility model;

[0018] Figure 3 This is a schematic structural diagram of a centrifugal cylinder of a maintenance-free circuit board membrane removal liquid filtering device of the utility model;

[0019] Figure 4 This is a schematic diagram of the first embodiment of the maintenance-free circuit board membrane removal liquid filtering device of the utility model;

[0020] Figure 5 This is a schematic diagram of the second embodiment of the maintenance-free circuit board membrane removal liquid filtering device of the utility model;

[0021] Figure 6 This is a schematic diagram of the third embodiment of the maintenance-free circuit board defilming liquid filtering device of the utility model;

[0022] In the figure: 1, base frame; 2, magnetic pump 1; 3, centrifugal cylinder; 31, cylinder body; 32, liquid inlet pipe; 33, drainage pipe; 331, extension convex pipe; 34, slag discharge port; 35, joint;

[0023] 4. Chemical solution tank; 5. Temporary storage tank; 6. Cotton core filter; 7. Demembrane module; 8. Air valve; 9. Pressure gauge; 10. Electric valve; 11. Magnetic pump 2. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Example 1

[0026] like Figure 1-4 As shown, a maintenance-free circuit board defilming liquid filtering device includes a base frame 1, a magnetic pump 2, a centrifugal cylinder 3 and a temporary storage tank 5, wherein the magnetic pump 2 is fixed on the bottom plate inside the base frame 1, and the centrifugal cylinder 3 is fixed on the top plate of the base frame 1, and is located above the magnetic pump 2; the magnetic pump 2 is connected to the liquid outlet of the medicine water tank 4 provided on the defilming equipment for collecting the suspension, and the centrifugal cylinder 3 is connected to the outlet of the magnetic pump 2 through a pipeline, and is used for centrifugally separating the membrane residue and the defilming liquid in the suspension; the centrifugal cylinder 3 includes a cylinder body 31, a liquid inlet pipe 32, a drain pipe 33, and a residue discharge port 34, the cylinder body 31 includes a cylindrical upper cylinder body and a conical lower cylinder body, the liquid inlet pipe 32 is provided at the upper end of the upper cylinder body, and the liquid outlet of the liquid inlet pipe 32 extends into the upper The inner wall of the upper cylinder is tangentially arranged inside the cylinder, and the drainage pipe 33 is arranged at the top of the upper cylinder, and the lower end thereof is provided with an extended convex pipe 331 extending to the inner part of the upper cylinder and crossing the outlet of the liquid inlet pipe 32. The extended convex pipe 331 exceeds the outlet of the liquid inlet pipe 32 by a certain distance to avoid the suspension being discharged directly without separation, which affects the filtering effect. The slag discharge port 34 is arranged at the bottom of the lower cylinder, and the slag discharge port 34 is provided with a joint 35 connected to the slag discharge pipe, which is quick and convenient to install; the temporary storage tank 5 is arranged downstream of the centrifugal cylinder 3, and is connected to the drainage pipe 33 of the centrifugal cylinder 3 through a pipeline, which is used to precipitate the liquid discharged from the centrifugal cylinder 3. The upper end of the temporary storage tank 5 is provided with an overflow port, and the overflow port is connected to the medicine tank 1 through a pipeline, and the overflowed medicine can be filtered and purified again by the centrifugal cylinder. The bottom of the base frame 1 is provided with a foot pad and a universal wheel, which can be easily moved and transported, and has good flexibility.

[0027] The magnetic pump 2 provides water pressure energy for the suspension entering the centrifugal cylinder 3, so that it has a working pressure of 2-3 bar, and the suspension entering the cylinder 31 moves downward along the inner wall of the cylinder 31 at a certain speed. Under the centrifugal gravity of the spiral movement, the difference in specific gravity between solid and liquid is utilized, and the specific gravity is expanded by several thousand times by relying on the centrifugal force field. The membrane residue in the suspension is separated from the liquid medicine, and the liquid medicine is discharged from the drain pipe 33 at the top of the cylinder 31. The membrane residue falls to the discharge port 34 and flows to the back stage. The centrifugal cylinder 3 has a large filtering capacity and a fast filtering speed. There is no filter screen inside, no need to drive, and no parts that need to be disassembled and maintained. It has a simple structure, is easy to operate, and is basically maintenance-free, which improves the filtering efficiency and the operating safety.

[0028] Among them, Figure 1 , 4 As shown, a liquid outlet is provided at the lower end of the temporary storage tank 5 , and a magnetic pump 11 is provided on the connecting pipeline of the liquid outlet. The magnetic pump 11 pumps the defilming liquid in the temporary storage tank 5 to the defilming module 7 .

[0029] In addition, a liquid level sensor group is provided in the temporary storage tank 5, and the liquid level sensor group is electrically connected to the magnetic pump 1 2 and the magnetic pump 2 11. When the liquid level sensor group detects that the liquid level in the temporary storage tank 5 is too high, in order to avoid the overflow port being blocked and the liquid overflowing from the tank, the liquid level sensor group sends a signal to control the magnetic pump 1 2 to stop; when the liquid level sensor group detects that the liquid level in the temporary storage tank 5 is too low, the liquid level sensor group sends a signal to control the magnetic pump 2 11 to stop, to avoid empty pumping, thereby improving the safety of the equipment.

[0030] During operation, magnetic pump 1 2 extracts liquid medicine from liquid medicine tank 1, stores the purified liquid medicine in temporary storage tank 5 through centrifugal filtration in centrifuge, and then pumps it to the main nozzle of defilming module through magnetic pump 2 11, which can be used for defilming of circuit boards with low precision requirements.

[0031] Example 2

[0032] like Figure 1-3As shown in Figure 5, a maintenance-free circuit board defilming liquid filtering device includes a base frame 1, a magnetic pump 2, a centrifugal cylinder 3 and a temporary storage tank 5, wherein the centrifugal cylinder 3 is provided with a plurality of centrifugal cylinders and connected in series along the flow direction of the liquid medicine, the magnetic pump 2 is fixed on the bottom plate inside the base frame 1, and the centrifugal cylinder 3 is fixed on the top plate of the base frame 1, and is located above the magnetic pump 2; the magnetic pump 2 is connected to the liquid outlet of the medicine tank 4 provided on the defilming equipment for collecting the suspension, and the centrifugal cylinder 3 is connected to the outlet of the magnetic pump 2 through a pipeline, and is used for centrifugally separating the membrane residue and the defilming liquid in the suspension; the centrifugal cylinder 3 includes a cylinder body 31, a liquid inlet pipe 32, a drain pipe 33, and a residue discharge port 34, the cylinder body 31 includes a cylindrical upper cylinder body and a conical lower cylinder body, the liquid inlet pipe 32 is provided at the upper end of the upper cylinder body, and The outlet of the liquid inlet pipe 32 extends into the interior of the upper cylinder and is tangentially arranged along the inner peripheral wall of the upper cylinder. The drainage pipe 33 is arranged at the top of the upper cylinder, and its lower end is provided with an extended convex pipe 331 extending into the interior of the upper cylinder and crossing the outlet of the liquid inlet pipe 32. The extended convex pipe 331 exceeds the outlet of the liquid inlet pipe 32 by a distance to avoid the suspension being discharged directly without separation, which affects the filtering effect. The slag discharge port 34 is arranged at the bottom of the lower cylinder, and the slag discharge port 34 is provided with a joint 35 for connecting the slag discharge pipe, which is quick and convenient to install; the temporary storage tank 5 is arranged downstream of the centrifugal cylinder 3, and is connected to the drainage pipe 33 of the centrifugal cylinder 3 through a pipeline, which is used to precipitate the liquid discharged from the centrifugal cylinder 3. The upper end of the temporary storage tank 5 is provided with an overflow port, and the overflow port is connected to the medicine tank 1 through a pipeline, and the overflowed medicine can be filtered and purified again by the centrifugal cylinder. The bottom of the base frame 1 is provided with a foot pad and a universal wheel, which can be easily moved and transported, and has good flexibility.

[0033] The magnetic pump 2 provides water pressure energy for the suspension entering the centrifugal cylinder 3, so that it has a working pressure of 2-3 bar, and the suspension entering the cylinder 31 moves downward along the inner wall of the cylinder 31 at a certain speed. Under the centrifugal gravity of the spiral movement, the difference in specific gravity between solid and liquid is utilized, and the specific gravity is expanded by several thousand times by relying on the centrifugal force field. The membrane residue in the suspension is separated from the liquid medicine, and the liquid medicine is discharged from the drain pipe 33 at the top of the cylinder 31. The membrane residue falls to the discharge port 34 and flows to the back stage. The centrifugal cylinder 3 has a large filtering capacity and a fast filtering speed. There is no filter screen inside, no need to drive, and no parts that need to be disassembled and maintained. It has a simple structure, is easy to operate, and is basically maintenance-free, which improves the filtering efficiency and the operating safety.

[0034] In this embodiment, Figure 1 , 5As shown, there are two centrifugal cylinders 3, which can ensure that the water inlet pressure of the second centrifugal cylinder is within the working pressure range of 2-3 bar, and has a good separation effect. In order to reduce the pressure loss entering the rear centrifugal cylinder. The centrifugal cylinder 3 located upstream is arranged below the centrifugal cylinder 3 located downstream, that is, multiple centrifugal cylinders 3 are distributed in a stepped manner extending upward along the flow direction of the liquid medicine, and the drainage pipe 33 of the upstream centrifugal cylinder 3 is connected to the liquid inlet pipe 32 of the downstream centrifugal cylinder 3 through a right-angle connecting pipe.

[0035] Among them, Figure 1 , 5 As shown, a liquid outlet is provided at the lower end of the temporary storage tank 5 , and a magnetic pump 11 is provided on the connecting pipeline of the liquid outlet. The magnetic pump 11 pumps the defilming liquid in the temporary storage tank 5 to the defilming module 7 .

[0036] In addition, a liquid level sensor group is provided in the temporary storage tank 5, and the liquid level sensor group is electrically connected to the magnetic pump 1 2 and the magnetic pump 2 11. When the liquid level sensor group detects that the liquid level in the temporary storage tank 5 is too high, in order to avoid the overflow port being blocked and the liquid overflowing from the tank, the liquid level sensor group sends a signal to control the magnetic pump 1 2 to stop; when the liquid level sensor group detects that the liquid level in the temporary storage tank 5 is too low, the liquid level sensor group sends a signal to control the magnetic pump 2 11 to stop, to avoid empty pumping, thereby improving the safety of the equipment.

[0037] During operation, the magnetic pump 1 2 draws liquid medicine from the medicine tank 1, and the purified liquid medicine is stored in the temporary storage tank 5 after two-stage centrifugal filtration by two centrifugal cylinders 3, and then pumped to the main nozzle of the film removal module through the magnetic pump 2 11, which can be used for film removal of circuit boards with not particularly high precision requirements.

[0038] Example 3

[0039] Based on the structure of Example 1 or Example 2, Figure 1-3 As shown in , 6, it also includes at least two cotton core filters 6, multiple cotton core filters 6 are connected in parallel, and one of the cotton core filters 6 is a redundant filter for backup, the inlet at the bottom of the cotton core filter 6 is connected to the liquid extraction port at the lower end of the temporary storage tank 5 through a pipeline, and the outlet at the upper end of the cotton core filter 6 is connected to the membrane removal module on the membrane removal device through a pipeline, and the magnetic pump 11 is located between the cotton core filter 6 and the temporary storage tank 5 to ensure the flow rate of the liquid medicine.

[0040] like Figure 6As shown, an air valve 8 is provided on the inlet pipe of each cotton core filter 6, and a pressure gauge 9 and an electric valve 10 are also provided on the outlet pipe of each cotton core filter 6. The outlet pressure of the cotton core filter 6 is detected by the pressure gauge 9, and the electric valve 10 controls its valve opening according to the detected pressure to ensure the best filtering effect; in addition, when the electric valve 10 is fully opened and still cannot meet the pressure requirement, it means that the cotton core filter 6 is blocked and needs to be replaced, the air valve 8 of the blocked cotton core filter 6 is closed, and the spare cotton core filter 6 is started at the same time, so as to ensure that the equipment can run continuously without stopping, thereby ensuring production efficiency.

[0041] When making fine lines (high precision requirements), the magnetic pump 11 is connected to the main nozzle of the membrane removal module after filtering once from the temporary storage tank 5 through the cotton core filter 6. The cotton core filter 6 is connected in parallel, and the number of cotton core filters 6 to be used can be freely switched according to the pressure flow, thereby increasing the filtering speed, and the cotton core can be replaced and repaired without stopping work, which is simple and convenient to operate.

[0042] like Figure 1-2 As shown, the top plate of the base frame 1 is stepped, a temporary storage tank 5 is provided on the top plate of the base frame 1 located below, a centrifugal cylinder 3 and a cotton core filter 6 are provided on the top plate of the base frame 1 located above, and a plurality of cotton core filters 6 are arranged side by side with the temporary storage tank 5, and the magnetic pump 11 is also fixed on the bottom plate inside the base frame 1. The overall structure is simple and compact, occupies little space, and is easy to install.

[0043] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A maintenance-free circuit board film removal liquid filtering device, characterized in that: It includes a base frame, a magnetic pump and a centrifugal cylinder. The magnetic pump is fixed on the bottom plate inside the base frame, and the centrifugal cylinder is fixed on the top plate of the base frame and is located above the magnetic pump. The magnetic pump is connected to a medicine water tank for collecting suspensions provided on the demembrane equipment, and the centrifugal cylinder is connected to the outlet of the magnetic pump through a pipeline, and is used for centrifugally separating the membrane residue and the demembrane liquid in the suspension. The centrifugal cylinder includes a cylinder body, a liquid inlet pipe, a drain pipe and a slag discharge port. The cylinder body includes a cylindrical upper cylinder body and a conical lower cylinder body. The liquid inlet pipe is provided at the upper end of the upper cylinder body, and the liquid outlet of the liquid inlet pipe extends into the interior of the upper cylinder body and is tangentially arranged along the inner peripheral wall of the upper cylinder body. The drain pipe is provided at the top of the upper cylinder body, and an extension convex pipe is provided at its lower end, which extends to the interior of the upper cylinder body and passes over the liquid inlet pipe liquid outlet. The slag discharge port is provided at the bottom of the lower cylinder body, and a joint for connecting the slag discharge pipe is provided on the slag discharge port.

2. The maintenance-free circuit board film removal liquid filtering device according to claim 1 is characterized in that: The centrifugal cylinders are provided in plurality and are connected in series along the flow direction of the liquid medicine.

3. The maintenance-free circuit board film removal liquid filtering device according to claim 2 is characterized in that: The centrifugal cylinder located upstream is arranged below the centrifugal cylinder located downstream, and the drainage pipe of the centrifugal cylinder located upstream is connected with the liquid inlet pipe of the centrifugal cylinder located downstream through a right-angle connecting pipe.

4. The maintenance-free circuit board film removal liquid filtering device according to claim 1 or 2, characterized in that: It also includes a temporary storage tank arranged downstream of the centrifugal cylinder, which is connected to the drain pipe of the centrifugal cylinder through a pipeline and is used to precipitate the liquid discharged from the centrifugal cylinder. An overflow port is arranged at the upper end of the temporary storage tank, and the overflow port is connected to the medicine tank through a pipeline.

5. The maintenance-free circuit board film removal liquid filtering device according to claim 4 is characterized in that: It also includes at least two cotton core filters, multiple cotton core filters are connected in parallel, and one of the cotton core filters is a redundant filter for backup, the inlet at the bottom of the cotton core filter is connected to the liquid extraction port at the lower end of the temporary storage tank through a pipeline, and the outlet at the upper end of the cotton core filter is connected to the membrane removal module on the membrane removal equipment through a pipeline.

6. The maintenance-free circuit board film removal liquid filtering device according to claim 5 is characterized in that: An air valve is arranged on the inlet pipe of each cotton core filter, and a pressure gauge and an electric valve are also arranged on the outlet pipe of each cotton core filter.

7. The maintenance-free circuit board film removal liquid filtering device according to claim 4 is characterized in that: The lower end of the temporary storage tank is arranged at the liquid outlet, and a second magnetic pump is arranged on the connecting pipeline of the liquid outlet.

8. The maintenance-free circuit board film removal liquid filtering device according to claim 7 is characterized in that: A liquid level sensor group is arranged in the temporary storage tank, and the liquid level sensor group is electrically connected to the first magnetic pump and the second magnetic pump.

9. The maintenance-free circuit board film removal liquid filtering device according to claim 7 is characterized in that: The top plate of the base frame is arranged in a stepped manner, a temporary storage tank is arranged on the bottom top plate of the base frame, a centrifugal cylinder and a cotton core filter are arranged on the top plate of the base frame, and multiple cotton core filters are arranged side by side with the temporary storage tank, and the second magnetic pump is also fixed on the bottom plate inside the base frame.

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