A fine filter for removing impurities from etching liquid

Abstract

The invention relates to the technical field of etching liquid filtration, and specifically to a fine filter for removing impurities from etching liquid, comprising an outer cylinder, an inner cylinder connected to the inner cavity of the outer cylinder, a filter cylinder arranged in the inner cavity of the inner cylinder, a filter screen and a mounting strip arranged between the side walls of the inner cavity of the filter cylinder, the mounting strip passing through a sliding rod connected thereto in a sliding manner, a limit block being arranged at the bottom of the sliding rod, a second liquid inlet pipe pushing the sliding rod to slide upward and squeeze the filter screen to produce deformation, and when the etching liquid is filtered and impurities are removed by the invention, one filter cylinder can be injected with etching liquid for filtering, while another filter cylinder can be reversely injected with flushing liquid to backwash the filter screen to remove the residue on the filter screen, and at the same time, during the backwashing process, the sliding rod can lift the filter screen to produce an upward convex deformation, and some residues blocked in the filter holes of the filter screen can be squeezed out to the top side surface of the filter screen, thereby making the backwashing effect of the filter screen better and improving the cleaning effect of the filter screen.

Description

Technical Field

[0001] The invention relates to the technical field of etching liquid filtration, in particular to a fine filter for removing impurities from etching liquid. Background Art

[0002] Etching liquid is a liquid that is used to carve by corroding the material. It is widely used in the production of printed circuit boards. A large amount of etching waste liquid is generated during the etching process of printed circuit boards. The waste liquid is doped with many impurities, such as organic matter and suspended particles. In order to make the etching waste liquid reusable, it is necessary to filter and remove impurities from the etching waste liquid, and filter out the impurities such as suspended matter inside. However, after a period of time, a large amount of impurities will accumulate on the filter net in the existing etching liquid filtering and impurity removal device, which causes the filtering effect of the filtering device to gradually decrease. Therefore, it is necessary to stop the filter net for cleaning, and the cleaning process reduces the filtering efficiency of the filtering device. To this end, the present invention has developed a fine filter for etching liquid impurity removal to solve the above problem. Summary of the invention

[0003] The object of the present invention is to provide a fine filter for removing impurities from etching liquid, which can reduce the downtime for cleaning the filter and improve the filtering efficiency of the etching liquid.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The filter is connected with the filter element of the filter element at the bottom, and the filter element is connected with the filter element at the bottom. The filter element is connected with the filter element at the bottom. The filter element is connected with the filter element at the bottom. The filter element is connected with the filter element at the bottom.

[0006] A driving mechanism is installed in the inner cavity of the outer cylinder, and the driving mechanism is respectively connected to the first liquid inlet pipe, the second liquid outlet pipe, the first liquid outlet pipe, the second liquid inlet pipe and the inner cylinder, and the driving mechanism first drives the first liquid inlet pipe, the second liquid outlet pipe, the first liquid outlet pipe and the second liquid inlet pipe to separate from the two filter cylinders respectively, and then drives the inner cylinder to rotate 180 degrees, and finally drives the first liquid inlet pipe, the second liquid outlet pipe, the first liquid outlet pipe and the second liquid inlet pipe to be connected to the two filter cylinders respectively.

[0007] Preferably, a sealing head for sealing the bottom liquid outlet of the filter cartridge is installed at the bottom of the limit block. When the first liquid outlet pipe and the second liquid inlet pipe are respectively connected to the filter cartridge, the sealing head is pushed to slide upward and open the bottom liquid outlet of the filter cartridge. When the first liquid outlet pipe and the second liquid inlet pipe are respectively separated from the filter cartridge, the sealing head slides downward and seals the bottom liquid outlet of the filter cartridge.

[0008] Preferably, the plugging head has a hollow structure inside and an opening at the bottom, a connecting port is opened on the side wall of the plugging head, a rubber sleeve is sleeved on the outer wall of the plugging head, and the connecting port passes through the rubber sleeve.

[0009] Preferably, the first liquid inlet pipe, the second liquid outlet pipe, the first liquid outlet pipe and the second liquid inlet pipe have the same structure, and the first liquid inlet pipe, the second liquid outlet pipe, the first liquid outlet pipe and the second liquid inlet pipe all include a first fixed pipe, the first fixed pipe is arranged to pass through the outer cylinder, one end of the first fixed pipe located inside the outer cylinder is connected to a corrugated hose, one end of the corrugated hose away from the first fixed pipe is connected to a second fixed pipe abutting against the plugging head, and the outer wall of the second fixed pipe is provided with a retaining ring whose diameter is larger than the diameter of the liquid outlet at the bottom of the filter cylinder.

[0010] Preferably, a sealing ring is provided on a side of the retaining ring close to the filter cartridge, and a sealing groove cooperating with the sealing ring is provided at the bottom of the filter cartridge.

[0011] Preferably, a spring is sleeved on the outer wall of the sliding rod, and the spring is located between the limiting block and the mounting bar.

[0012] Preferably, the driving mechanism includes a driving member and a double-ended screw, the double-ended screw is rotatably connected between the top and bottom of the inner cavity of the outer cylinder, and the double-ended screw rotates through the inner cylinder, the outer walls at opposite ends of the double-ended screw are symmetrically threaded with sliders, and the slider located at the top is connected to the first liquid inlet pipe and the second liquid outlet pipe, and the slider located at the bottom is connected to the first liquid outlet pipe and the second liquid inlet pipe, and the driving member is respectively connected to the double-ended screw and the bottom of the inner cylinder.

[0013] Preferably, the driving member includes a driving motor installed at the bottom of the inner cavity of the outer cylinder, and the driving motor is a forward and reverse motor, an incomplete driving gear is fixedly connected to the output end of the driving motor, a driven gear meshing with the incomplete driving gear is installed on the outer wall of the double-headed screw, an inner gear ring meshing with the incomplete driving gear is rotatably connected to the bottom of the inner cylinder through a bearing disk, and the incomplete driving gear and the driven gear and the inner gear ring are not meshed at the same time, a plurality of pawls are arranged at equal angles on the outer wall of the inner gear ring, and an inner ratchet that cooperates with the pawls is fixedly connected to the bottom of the inner cylinder.

[0014] Preferably, an annular conical guide block is provided at the bottom of the inner cavity of the filter cartridge.

[0015] Preferably, the inner cylinder and the inner wall of the outer cylinder are rotatably connected via two slewing bearing discs.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides two filter cartridges, so that when the etching liquid is filtered and impurities are removed, one filter cartridge can be injected with the etching liquid for filtering, and the other filter cartridge can be reversely injected with flushing liquid to backwash the filter screen to remove the residue on the filter screen, and after filtering for a period of time, the two filter cartridges can be driven by a driving mechanism to automatically switch, so that the two processes can be carried out simultaneously, thereby reducing the downtime for cleaning the filter screen and improving the filtering efficiency of the etching liquid. At the same time, during the backwashing process, the sliding rod can lift the filter screen to produce an upward convex deformation, which can squeeze out some residues blocked in the filter holes of the filter screen to the top side surface of the filter screen, thereby making the backwashing effect of the filter screen better and improving the cleaning effect of the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the filter of the present invention;

[0020] Figure 2 It is a schematic diagram of the front cross-sectional structure of the filter of the present invention;

[0021] Figure 3 This is a schematic diagram of the first angle structure of the inner cylinder in the filter of the present invention;

[0022] Figure 4 It is a second angle structural schematic diagram of the inner cylinder in the filter of the present invention;

[0023] Figure 5 It is a schematic structural diagram of a double-ended screw rod and its connecting parts in the filter of the present invention;

[0024] Figure 6 It is a schematic structural diagram of the blocking component in the filter of the present invention.

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. Outer cylinder; 2. First liquid inlet pipe; 21. First fixed pipe; 22. Corrugated hose; 23. Second fixed pipe; 24. Retaining ring; 25. Sealing ring; 3. Second liquid outlet pipe; 4. First liquid outlet pipe; 5. Second liquid inlet pipe; 6. Inner cylinder; 7. Filter cylinder; 71. Conical guide block; 8. Filter screen; 9. Mounting strip; 10. Sliding rod; 11. Driving mechanism; 111. Double-headed screw; 112. Sliding block; 113. Driving motor; 114. Incomplete driving gear; 115. Driven gear; 116. Internal gear ring; 117. Ratchet; 118. Internal ratchet; 12. Sealing head; 121. Connecting port; 122. Rubber sleeve; 13. Spring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1-6 As shown: The technical solution provided by the present invention is:

[0029] A fine filter for removing impurities from etching liquid, comprising an outer cylinder 1 with a base, wherein two opposite sides of the top of the outer cylinder 1 are symmetrically connected with a retractable first liquid inlet pipe 2 and a second liquid outlet pipe 3, and two opposite sides of the bottom of the outer cylinder 1 are symmetrically connected with a retractable first liquid outlet pipe 4 and a second liquid inlet pipe 5, and the first liquid inlet pipe 2 and the first liquid outlet pipe 4 are correspondingly arranged, and the second liquid outlet pipe 3 and the second liquid inlet pipe 5 are correspondingly arranged, an inner cylinder 6 is rotatably connected between the side walls of the inner cavity of the outer cylinder 1, and two opposite sides of the inner cavity of the inner cylinder 6 are symmetrically arranged with a filter cylinder 7, a filter screen 8 and a mounting bar 9 are installed between the side walls of the inner cavity of the filter cylinder 7, and the mounting bar 9 is located below the filter screen 8, and a sliding rod 10 is slidably connected through the mounting bar 9, and a limiting block is provided at the bottom of the sliding rod 10, when one filter cylinder 7 is connected with the first liquid inlet pipe 2 and the first liquid outlet pipe 4, the other filter cylinder 7 is connected with the second liquid outlet pipe 3 and the second liquid inlet pipe 5, and when the second liquid inlet pipe 5 is connected with the filter cylinder 7, the second liquid inlet pipe 5 pushes the sliding rod 10 to slide upward and squeezes the filter screen 8 to produce deformation;

[0030] A driving mechanism 11 is installed in the inner cavity of the outer cylinder 1, and the driving mechanism 11 is respectively connected to the first liquid inlet pipe 2, the second liquid outlet pipe 3, the first liquid outlet pipe 4, the second liquid inlet pipe 5 and the inner cylinder 6, and the driving mechanism 11 first drives the first liquid inlet pipe 2, the second liquid outlet pipe 3, the first liquid outlet pipe 4 and the second liquid inlet pipe 5 to separate from the two filter cylinders 7 respectively, and then drives the inner cylinder 6 to rotate 180 degrees, and finally drives the first liquid inlet pipe 2, the second liquid outlet pipe 3, the first liquid outlet pipe 4 and the second liquid inlet pipe 5 to be connected to the two filter cylinders 7 respectively.

[0031] In this embodiment, in order to prevent leakage of residual liquid in the two filter cylinders when the inner cylinder rotates, a sealing head 12 for sealing the bottom liquid outlet of the filter cylinder 7 is installed at the bottom of the limit block. When the first liquid outlet pipe 4 and the second liquid inlet pipe 5 are respectively connected to the filter cylinder 7, the sealing head 12 is pushed to slide upward and open the bottom liquid outlet of the filter cylinder 7. When the first liquid outlet pipe 4 and the second liquid inlet pipe 5 are respectively separated from the filter cylinder 7, the sealing head 12 slides downward and seals the bottom liquid outlet of the filter cylinder 7. The sealing head 12 has a hollow structure inside and an opening at the bottom. A connecting port 121 is provided on the side wall of the sealing head 12. A rubber sleeve 122 is provided on the outer wall of the sealing head 12, and the connecting port 121 passes through the rubber sleeve 122. The deformation ability of the rubber sleeve 122 can ensure the sealing between the sealing head 12 and the bottom liquid outlet of the filter cylinder 7.

[0032] In this embodiment, the first liquid inlet pipe 2, the second liquid outlet pipe 3, the first liquid outlet pipe 4 and the second liquid inlet pipe 5 have the same structure. The first liquid inlet pipe 2, the second liquid outlet pipe 3, the first liquid outlet pipe 4 and the second liquid inlet pipe 5 all include a first fixed pipe 21, the first fixed pipe 21 is arranged to penetrate the outer cylinder 1, and the end of the first fixed pipe 21 located inside the outer cylinder 1 is connected with a corrugated hose 22, and the end of the corrugated hose 22 away from the first fixed pipe 21 is connected with a second fixed pipe 23 abutting against the plugging head 12, and the outer wall of the second fixed pipe 23 is provided with a diameter larger than the filter A retaining ring 24 with a diameter of the liquid outlet at the bottom of the cylinder 7 is provided, and a sealing ring 25 is provided on one side of the retaining ring 24 close to the filter cylinder 7. A sealing groove that cooperates with the sealing ring 25 is provided at the bottom of the filter cylinder 7, wherein the second fixed tube 23 can be inserted into the liquid outlets at the top and bottom of the filter cylinder 7 and lift the plugging head 12 to realize that the plugging head 12 opens the filter cylinder 7, and realizes the connection between the liquid inlet pipe, the liquid outlet pipe and the filter cylinder 7, and the setting of the retaining ring 24 can abut against the filter cylinder 7 to realize position limiting, and the corrugated hose 22 provides the deformation of the liquid inlet pipe and the liquid outlet pipe.

[0033] In this embodiment, in order to ensure that the sliding rod 10 can quickly return to its original position after losing the external thrust, a spring 13 is sleeved on the outer wall of the sliding rod 10 , and the spring 13 is located between the limit block and the mounting bar 9 .

[0034] In this embodiment, in order to enable the first liquid inlet pipe 2, the second liquid inlet pipe 5, the first liquid outlet pipe 4 and the second liquid outlet pipe 3 to be separated and docked synchronously and to ensure that their positions are fixed, the driving mechanism 11 includes a driving member and a double-headed screw 111. The double-headed screw 111 is rotatably connected between the top and bottom of the inner cavity of the outer tube 1, and the double-headed screw 111 rotates through the inner tube 6. The outer walls of the opposite ends of the double-headed screw 111 are symmetrically threaded with sliders 112, and the slider 112 located at the top is connected to the first liquid inlet pipe 2 and the second liquid outlet pipe 3, and the slider 112 located at the bottom is connected to the first liquid outlet pipe 4 and the second liquid inlet pipe 5. The driving member is respectively connected to the double-headed screw 111 and the bottom of the inner tube 6, wherein the interlocking operation between the double-headed screw 111 and the slider 112 remains fixed, so that the positions of the liquid outlet pipe and the liquid inlet pipe remain fixed.

[0035] In addition, in this embodiment, the driving member includes a driving motor 113 installed at the bottom of the inner cavity of the outer cylinder 1, and the driving motor 113 is a forward and reverse motor. An incomplete driving gear 114 is fixedly connected to the output end of the driving motor 113, and a driven gear 115 meshing with the incomplete driving gear 114 is installed on the outer wall of the double-headed screw rod 111. An inner gear ring 116 meshing with the incomplete driving gear 114 is rotatably connected to the bottom of the inner cylinder 6 through a bearing plate, and the incomplete driving gear 114 is not meshed with the driven gear 115 and the inner gear ring 116 at the same time. A plurality of ratchet pawls 117 are arranged on the outer wall of the inner gear ring 116 at equal angles. An inner ratchet 118 cooperating with the ratchet pawl 117 is fixedly connected to the bottom of the inner cylinder 6. When the driving motor rotates forward, First, the incomplete driving gear is driven to mesh with the driven gear, thereby driving the double-headed screw to rotate, realizing the extension and retraction of the liquid inlet pipe and the liquid outlet pipe, and then the incomplete driving gear is meshed with the inner gear ring to drive the inner gear ring to rotate, and the inner gear ring will drive the inner cylinder to rotate through the cooperation of the pawl and the inner ratchet, thereby realizing the switching of the two filter cylinder positions, and then after the switching is completed, the drive motor is started in the reverse direction to drive the incomplete driving gear to rotate in the opposite direction. At this time, the incomplete driving gear drives the inner gear ring to rotate in the opposite direction, and the inner gear ring will not drive the inner ratchet and the inner cylinder to rotate through the cooperation of the pawl and the inner ratchet, and then the incomplete driving gear drives the driven gear and the double-headed screw to rotate in the opposite direction, so that the liquid inlet pipe and the liquid outlet pipe are lowered and inserted into the filter cylinder, thereby realizing the connection of the filter cylinder.

[0036] In this embodiment, an annular conical guide block 71 is provided at the bottom of the filter cartridge 7, which can completely discharge the liquid etching liquid in the filter cartridge to avoid it remaining in the filter cartridge.

[0037] In this embodiment, the inner cylinder 6 and the inner wall of the outer cylinder 1 are rotatably connected via two slewing bearing disks. The slewing bearing disks can not only reduce the rotational friction between the inner cylinder and the outer cylinder, but also support the inner cylinder to ensure the stability of the inner cylinder.

[0038] The specific working principle of this embodiment is as follows:

[0039] When filtering the etching waste liquid, the etching waste liquid is injected into the filter cylinder 7 through the first liquid inlet pipe 2, and then filtered by the filter screen 8 to remove the residue in the waste liquid, and the filtered filtrate is discharged through the first liquid outlet pipe 4 for collection;

[0040] After filtering for a period of time, stop feeding the liquid, start the driving motor 113 in the forward direction, the driving motor 113 drives the incomplete driving gear 114 to rotate, the incomplete driving gear 114 first meshes with the driven gear 115, thereby driving the double-headed screw 111 to rotate, so that the sliders 112 at both ends of the double-headed screw 111 slide in the direction away from each other, thereby driving the first liquid inlet pipe 2, the second liquid outlet pipe 3, the first liquid outlet pipe 4 and the second liquid inlet pipe 5 to slide in the direction away from each other, wherein the corrugated hose 22 is first contracted, so that the second fixed pipe 23 assembly slides out of the range of the filter cartridge 7, until the second fixed pipe 23 of the second liquid inlet pipe 5 completely slides out, completing the separation of the first liquid inlet pipe 2, the first liquid outlet pipe 4, the second liquid inlet pipe 5 and the second liquid outlet pipe 3 from the filter cartridge 7;

[0041] In addition, when the second fixed tube 23 slides outward, the plugging head 12 slides downward under the action of the restoring force of the spring 13, thereby gradually being inserted into the liquid outlet at the bottom of the filter cartridge 7, and the top of the plugging head 12 is flush with the bottom of the inner cavity of the filter cartridge 7, thereby sealing the filter cartridge 7 and preventing the liquid from flowing out of the filter cartridge 7 during the switching process;

[0042] As the incomplete driving gear 114 continues to rotate, it gradually meshes with the inner gear ring 116 after being disengaged from the driven gear 115, and drives the inner gear ring 116 to rotate. The inner gear ring 116 drives the inner cylinder 6 to rotate through the cooperation of the pawl 117 and the inner ratchet 118, thereby realizing the switching of the two filter cylinders 7, that is, switching the filter cylinder 7 in the filtering position to the flushing position, and switching the filter cylinder 7 in the flushing position to the filtering position;

[0043] After the switching is completed, the driving motor 113 is started in the reverse direction, and the driving motor 113 drives the incomplete driving gear 114 to rotate in the reverse direction, thereby first driving the inner gear ring 116 to rotate in the reverse direction, and the inner gear ring 116 will not drive the inner cylinder 6 to rotate through the cooperation of the pawl 117 and the inner ratchet 118, and then the incomplete driving gear 114 is meshed with the driven gear 115, thereby driving the double-headed screw rod 111 to rotate in the reverse direction, driving the four second fixed tubes 23 to be gradually inserted into the filter cylinder 7, wherein the second fixed tube 23 of the first liquid outlet pipe 4 gradually lifts up the plugging head 12 in the filter cylinder 7, so that the connecting port 121 of the plugging head 12 enters the filter cylinder 7 to realize the connection of the liquid, and the second fixed tube 23 of the second liquid inlet pipe 5 is gradually inserted into the plugging head 12 assembly in the filter cylinder 7 to lift it up, and the sliding rod 10 of the plugging head 12 gradually rises and contacts with the bottom of the filter screen 8, lifting up the filter screen 8 to deform it and squeeze out the residue blocked in the filter hole;

[0044] Then, the etching waste liquid and the backwashing liquid are respectively injected into the two filter cartridges 7 again, and the backwashing liquid can be rinsed with the filtered etching waste liquid; the filter cartridge 7 at the filtering position is filtered, and the filtered liquid at the backwashing position flows upward from the bottom of the filter screen 8, thereby flushing the residue on the top surface of the filter screen 8 and floating it above the liquid for discharge, and in order to increase the flow rate of the liquid inside the backwashing position (to improve the flushing effect), a group of water pumps are connected to the second liquid outlet pipe 3 for suction. After the flushing is completed, the valve of the backwashing liquid is closed, and the liquid intake is stopped and wait for the next switching process, and the etching waste liquid is subjected to efficient impurity removal and filtration treatment in this way.

[0045] At the same time, in order to improve the flushing effect of the filter screen 8, the drive motor 113 can be started intermittently during the operation of the equipment, so that the drive motor 113 can be intermittently reversed, and during the intermittent forward and reverse rotation, the first liquid inlet pipe 2, the second liquid outlet pipe 3, the first liquid outlet pipe 4 and the second liquid inlet pipe 5 are not separated from the filter cylinder 7, while the second liquid inlet pipe 5 is separated from the plugging head 12, so that the plugging head 12 and the sliding rod 10 can slide back and forth up and down during the backwashing process, so that the filter screen 8 can be squeezed back and forth, thereby further improving the backwashing effect of the filter screen 8.

[0046] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may 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. A fine filter for removing impurities from etching liquid, characterized in that: The invention comprises an outer cylinder (1) with a base, wherein two opposite sides of the top of the outer cylinder (1) are symmetrically connected with a telescopic first liquid inlet pipe (2) and a second liquid outlet pipe (3), and two opposite sides of the bottom of the outer cylinder (1) are symmetrically connected with a telescopic first liquid outlet pipe (4) and a second liquid inlet pipe (5), and the first liquid inlet pipe (2) and the first liquid outlet pipe (4) are arranged correspondingly, and the second liquid outlet pipe (3) and the second liquid inlet pipe (5) are arranged correspondingly, and an inner cylinder (6) is rotatably connected between the side walls of the inner cavity of the outer cylinder (1), and filter cylinders (7) are symmetrically arranged on the opposite sides of the inner cavity of the inner cylinder (6), and the inner cavity side walls of the filter cylinder (7) are arranged A filter screen (8) and a mounting bar (9) are installed between the walls, and the mounting bar (9) is located below the filter screen (8). The mounting bar (9) penetrates and is slidably connected to a sliding rod (10), and a limit block is provided at the bottom of the sliding rod (10). When one of the filter cartridges (7) is connected to the first liquid inlet pipe (2) and the first liquid outlet pipe (4), the other filter cartridge (7) is connected to the second liquid outlet pipe (3) and the second liquid inlet pipe (5), and when the second liquid inlet pipe (5) is connected to the filter cartridge (7), the second liquid inlet pipe (5) pushes the sliding rod (10) to slide upwards and squeeze the filter screen (8) to cause deformation; The inner cavity of the outer cylinder (1) is provided with a driving mechanism (11), and the driving mechanism (11) is respectively connected to the first liquid inlet pipe (2), the second liquid outlet pipe (3), the first liquid outlet pipe (4), the second liquid inlet pipe (5) and the inner cylinder (6), and the driving mechanism (11) first drives the first liquid inlet pipe (2), the second liquid outlet pipe (3), the first liquid outlet pipe (4) and the second liquid inlet pipe (5) to be separated from the two filter cylinders (7) respectively, and then drives the inner cylinder (6) to rotate 180 degrees, and finally drives the first liquid inlet pipe (2), the second liquid outlet pipe (3), the first liquid outlet pipe (4) and the second liquid inlet pipe (5) to be respectively connected to the two filter cylinders (7); A plugging head (12) for plugging the bottom liquid outlet of the filter cartridge (7) is installed at the bottom of the limit block; when the first liquid outlet pipe (4) and the second liquid inlet pipe (5) are respectively connected to the filter cartridge (7), the plugging head (12) is pushed to slide upward and open the bottom liquid outlet of the filter cartridge (7); when the first liquid outlet pipe (4) and the second liquid inlet pipe (5) are respectively separated from the filter cartridge (7), the plugging head (12) slides downward and plugs the bottom liquid outlet of the filter cartridge (7); The plugging head (12) has a hollow structure inside and an opening at the bottom; a communication port (121) is provided on the side wall of the plugging head (12); a rubber sleeve (122) is sleeved on the outer wall of the plugging head (12), and the communication port (121) passes through the rubber sleeve (122); The driving mechanism (11) comprises a driving member and a double-headed screw (111); the double-headed screw (111) is rotatably connected between the top and bottom of the inner cavity of the outer cylinder (1), and the double-headed screw (111) rotatably penetrates the inner cylinder (6); the outer walls of opposite ends of the double-headed screw (111) are symmetrically threaded with sliders (112); the slider (112) located at the top is connected to the first liquid inlet pipe (2) and the second liquid outlet pipe (3), and the slider (112) located at the bottom is connected to the first liquid outlet pipe (4) and the second liquid inlet pipe (5); the driving member is respectively connected to the double-headed screw (111) and the bottom of the inner cylinder (6); The driving member comprises a driving motor (113) mounted on the bottom of the inner cavity of the outer cylinder (1), and the driving motor (113) is a forward and reverse motor. An incomplete driving gear (114) is fixedly connected to the output end of the driving motor (113). A driven gear (115) meshingly connected to the incomplete driving gear (114) is mounted on the outer wall of the double-ended screw rod (111). An inner toothed ring (116) meshingly connected to the incomplete driving gear (114) is rotatably connected to the bottom of the inner cylinder (6) via a bearing disk. The incomplete driving gear (114) meshes with the driven gear (115) and the inner toothed ring (116) at different times. A plurality of ratchet pawls (117) are arranged on the outer wall of the inner toothed ring (116) at equal angles. An inner ratchet (118) cooperating with the ratchet pawls (117) is fixedly connected to the bottom of the inner cylinder (6).

2. The fine filter for removing impurities from etching liquid according to claim 1, characterized in that: The first liquid inlet pipe (2), the second liquid outlet pipe (3), the first liquid outlet pipe (4) and the second liquid inlet pipe (5) have the same structure. The first liquid inlet pipe (2), the second liquid outlet pipe (3), the first liquid outlet pipe (4) and the second liquid inlet pipe (5) all comprise a first fixed pipe (21). The first fixed pipe (21) is arranged to penetrate the outer cylinder (1). One end of the first fixed pipe (21) located inside the outer cylinder (1) is connected to a corrugated hose (22). One end of the corrugated hose (22) away from the first fixed pipe (21) is connected to a second fixed pipe (23) abutting against the plugging head (12). The outer wall of the second fixed pipe (23) is provided with a retaining ring (24) having a diameter greater than that of the liquid outlet at the bottom of the filter cylinder (7).

3. The fine filter for removing impurities from etching liquid according to claim 2, characterized in that: A sealing ring (25) is provided on a side of the retaining ring (24) close to the filter cartridge (7), and a sealing groove cooperating with the sealing ring (25) is provided at the bottom of the filter cartridge (7).

4. The fine filter for removing impurities from etching liquid according to claim 1, characterized in that: The outer wall of the sliding rod (10) is sleeved with a spring (13), and the spring (13) is located between the limiting block and the mounting bar (9).

5. The fine filter for removing impurities from etching liquid according to claim 1, characterized in that: An annular conical guide block (71) is provided at the bottom of the inner cavity of the filter cartridge (7).

6. The fine filter for removing impurities from etching liquid according to claim 1, characterized in that: The inner cylinder (6) and the inner wall of the outer cylinder (1) are rotatably connected via two slewing bearing discs.

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