Hydrofluoric acid sampling and filtering device

Abstract

The invention discloses a hydrofluoric acid sampling and filtering device, and relates to the technical field of hydrofluoric acid processing equipment.The hydrofluoric acid sampling and filtering device comprises a filtering storage tank and a sealing cover arranged at the top end of the filtering storage tank, a micropore filtering net frame is fixedly installed on the inner side of the filtering storage tank, and the micropore filtering net frame is of a concave bowl-shaped structure; a guide net frame is formed in the center of the microporous filter net frame towards the bulge and is of a hemispherical structure. And a plurality of filter elements which are arranged at equal intervals along a circumferential track are arranged below the microporous filter screen frame. The device has a multi-stage filtering effect on a low-concentration hydrofluoric acid solution, and the cleaning effect is improved. The first cleaning scraping rods and the second cleaning scraping rods can enable impurities on the surfaces of the concave net body of the microporous filter net frame and the convex net body of the guide net frame to fall on the bottom of the relative space of the microporous filter net frame and the guide net frame. The phenomenon that impurities are accumulated on the surface of the microporous filter screen frame is effectively avoided, the falling speed of the hydrofluoric acid solution is increased, and the filtering operation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrofluoric acid processing equipment, and particularly relates to a hydrofluoric acid sampling and filtering device. Background Art

[0002] In the production process of hydrofluoric acid, filtration after distillation is a key step to ensure product purity and safety. The core purpose of filtration is to remove solid impurities, corrosion products, raw material residues, system pollutants, etc. Among them, corrosion products are particles such as nickel fluoride that may be generated by high-temperature corrosion of distillation equipment. Raw material residues are insoluble fluorosilicates or calcium fluoride precipitates that may be formed by silicon and calcium compounds in fluorite. System pollutants are debris from pipeline rust and seal material particles, etc.

[0003] When hydrofluoric acid is distilled and produced, the hydrofluoric acid at the outlet of the distillation tower is anhydrous gaseous or low-temperature liquid. Gaseous hydrofluoric acid penetrates the filter medium and cannot intercept particles. Direct filtration is not feasible. And pure liquid hydrofluoric acid is extremely corrosive and easily vaporizes, resulting in system pressure fluctuations. Therefore, in the hydrofluoric acid production process, filtration after distillation must be carried out after adding water for liquefaction (i.e., preparing an aqueous solution). Specifically, gaseous / pure liquid hydrofluoric acid needs to be absorbed into water to form an aqueous solution with a concentration of 30% - 70%, and then the filtration operation is carried out on it.

[0004] Most of the existing filtration equipment for low-concentration hydrofluoric acid solutions filters the hydrofluoric acid solution through a microporous filter mesh frame or a filter element made of PTEE material. During the long-term filtration operation, the surface of the microporous filter mesh frame for filtering solid impurities is prone to clogging, which easily leads to a slow flow rate of the hydrofluoric acid solution and a reduction in filtration efficiency. In the actual production process, to ensure filtration efficiency, it is necessary to increase the cleaning frequency of the filtration equipment. Since hydrofluoric acid has certain toxicity, the preparation time for cleaning work is long, the operation difficulty is high, and the time consumed is long. Therefore, the present application provides a hydrofluoric acid sampling and filtering device to meet the requirements. Summary of the Invention

[0005] In view of the above problems, the present application provides a hydrofluoric acid sampling and filtering device.

[0006] To achieve the above object, the present application provides the following technical solution: A hydrofluoric acid sampling and filtering device includes a filtration storage tank and a sealing cover provided at its top. A microporous filter mesh frame is fixedly installed inside the filtration storage tank. The microporous filter mesh frame has a concave bowl-shaped structure, and the central position of the microporous filter mesh frame bulges towards the inside to form a guiding mesh frame, and the guiding mesh frame has a hemispherical structure.

[0007] Below the micro-porous filter mesh frame, there are multiple filter elements arranged equidistantly along the circumferential trajectory. The low-concentration hydrofluoric acid solution flowing into the interior of the filtration storage tank falls after passing through the micro-porous filter mesh frame and the guiding mesh frame, and is discharged to the outside of the filtration storage tank after contacting the filter elements.

[0008] Inside the sunken mesh body of the micro-porous filter mesh frame, there are multiple first cleaning scraping rods arranged equidistantly along the circumferential trajectory. Outside the protruding mesh body of the guiding mesh frame, there are multiple second cleaning scraping rods arranged equidistantly along the circumferential trajectory. The multiple first cleaning scraping rods and second cleaning scraping rods can rotate synchronously in opposite directions, so that the impurities on the surfaces of the sunken mesh body of the micro-porous filter mesh frame and the protruding mesh body of the guiding mesh frame fall.

[0009] Furthermore, at the top of the micro-porous filter mesh frame, there is a rotatable first driving gear ring. The tops of the multiple first cleaning scraping rods are fixedly installed with the first driving gear ring. The inner side of the first driving gear ring is meshed and connected with a power gear through a tooth block. As the power gear rotates, the first driving gear ring and the first cleaning scraping rods rotate in the same direction as it.

[0010] Furthermore, on the inner ring line of the first driving gear ring, there is a second driving gear ring coaxially distributed with it. The tops of the multiple second cleaning scraping rods are fixedly installed with the second driving gear ring. The outer side of the second driving gear ring is meshed with the power gear through teeth. As the power gear, the first driving gear ring and the first cleaning scraping rods rotate synchronously, the second driving gear ring and the second cleaning scraping rods rotate in the opposite direction to it.

[0011] Furthermore, above the power gear, there is a first linkage runner coaxially distributed with it connected through a synchronous shaft. The first linkage runner is connected with a second linkage runner through a synchronous belt. The first linkage runner and the second linkage runner are in the same horizontal plane.

[0012] At the central axis position of the second linkage runner, there is an electric driving rod that can rotate synchronously with it. The electric driving rod penetrates through the sealing cover and the guiding mesh frame from top to bottom. Outside the sealing cover, there is a motor adapted to the electric driving rod. When the electric driving rod drives the second linkage runner to rotate, the first linkage runner, the synchronous shaft and the power gear rotate in the same direction as it.

[0013] Furthermore, below the micro-porous filter mesh frame, there is a synchronous gear ring. The synchronous gear ring is fixedly installed with the electric driving rod through a connecting rod. And the inner side of the synchronous gear ring is meshed with multiple synchronous gears arranged equidistantly along the circumferential trajectory. The synchronous gears are rotatably installed on the inner wall of the filtration storage tank.

[0014] The central axis position of the synchronous gear is provided with a rotating rod that can rotate synchronously with it. Multiple rotating rods are staggered with multiple filter elements. Each rotating rod is fixed with multiple groups of drainage rods distributed from top to bottom. The number of drainage rods in each group is two, and the two drainage rods are distributed in a V-shaped structure. When the electric drive rod, the synchronous gear ring and the synchronous gear rotate, the rotating rod and the multiple groups of drainage rods rotate synchronously.

[0015] Furthermore, a positioning plate is fixedly installed at the lower position of the inner cavity of the filter tank, the filter elements are fixedly installed on the positioning plate, the bottom ends of the rotating rods are rotatably installed with the positioning plate, and the surfaces of the positioning plates are provided with flow ports that are compatible with the filter elements.

[0016] Furthermore, a liquid outlet pipe is provided at the bottom of the filter storage tank, and the low-concentration hydrofluoric acid solution discharged through the circulation port is discharged to the outside of the filter storage tank through the liquid outlet pipe.

[0017] Furthermore, an isolation plate is fixedly installed inside the sealing cover, the electric drive rod and the synchronous shaft are rotatably installed with the isolation plate, the first linkage wheel, the second linkage wheel and the synchronous belt are all located above the isolation plate, the power gear is located below the isolation plate, and the first drive gear ring and the second drive gear ring are rotatably installed below the isolation plate.

[0018] Furthermore, a liquid inlet pipe is fixedly installed on the sealing cover, and the liquid inlet pipe extends to the bottom of the isolation plate. The low-concentration hydrofluoric acid solution from the outside of the filter storage tank flows into the interior of the microporous filter frame through the liquid inlet pipe.

[0019] In summary, the technical effects and advantages of the present invention are:

[0020] 1. The present invention provides multi-stage filtration for low-concentration hydrofluoric acid solutions, effectively removing impurities from the solution and enhancing cleaning effectiveness. Multiple first and second cleaning scrapers allow impurities on the surfaces of the concave mesh of the microporous filter and the convex mesh of the guide frame to fall to the bottom of the space between the two. This effectively prevents impurities from accumulating on the surface of the microporous filter, increases the drop rate of the hydrofluoric acid solution, and improves the efficiency of the filtration operation.

[0021] 2. The first cleaning scraper rod and the second cleaning scraper rod in the present invention do not interfere with each other during the rotation process, so that there is always space for impurities to be stored at the bottom of the relative space between the microporous filter frame and the guide frame. The stored impurities will not be transferred by the first cleaning scraper rod and the second cleaning scraper rod in the rotating state, thereby effectively avoiding the wear of the first cleaning scraper rod and the second cleaning scraper rod by impurities. At the same time, the resistance of the first cleaning scraper rod and the second cleaning scraper rod during the rotation process can also be reduced, thereby increasing the service life of the first cleaning scraper rod and the second cleaning scraper rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the filter storage tank and the sealing cover after being cut open.

[0025] Figure 3 This is a schematic diagram of the filter storage tank, sealing cover and isolation plate after being cut apart.

[0026] Figure 4 This is a schematic diagram of the internal structure of the microporous filter frame of the present invention after being cut open.

[0027] Figure 5 This is a schematic diagram of the position distribution of the microporous filter frame and filter element of the shell of the present invention.

[0028] Figure 6 This is a schematic diagram of the position distribution of the microporous filter frame, the guide frame, the first cleaning scraper and the second cleaning rod of the present invention.

[0029] Figure 7 Schematic diagram of the position distribution of the filter element, rotating rod and drainage rod of the present invention.

[0030] In the figure: 1. Filter storage tank; 101. Positioning plate; 102. Flow port; 103. Liquid outlet pipe; 2. Sealing cover; 201. Isolation plate; 202. Liquid inlet pipe; 3. Microporous filter mesh frame; 301. Guide mesh frame; 4. Filter element; 5. First drive gear ring; 6. First cleaning scraper; 7. Power gear; 8. Second drive gear ring; 9. Second cleaning scraper; 10. First linkage rotor; 11. Synchronous shaft; 12. Synchronous belt; 13. Second linkage rotor; 14. Electric drive rod; 15. Synchronous gear ring; 16. Synchronous gear; 17. Rotating rod; 18. Drainage rod. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0032] Example 1: Reference Figures 1-4A hydrofluoric acid sampling and filtering device shown in the figure includes a filtering storage tank 1 and a sealing cover 2 provided at its top end. A microporous filter mesh frame 3 is fixedly installed inside the filtering storage tank 1. The microporous filter mesh frame 3 has a concave bowl-shaped structure, and a guiding mesh frame 301 is formed by protruding towards the center of the microporous filter mesh frame 3. The guiding mesh frame 301 has a hemispherical structure.

[0033] Below the microporous filter mesh frame 3, a plurality of filter elements 4 are arranged at equal intervals along a circular trajectory. The low-concentration hydrofluoric acid solution flowing into the interior of the filtering storage tank 1 falls after passing through the microporous filter mesh frame 3 and the guiding mesh frame 301, and is discharged to the outside of the filtering storage tank 1 after contacting the filter elements 4. The combined setting of the microporous filter mesh frame 3, the guiding mesh frame 301, and the filter elements 4 has a multi-stage filtering effect on the low-concentration hydrofluoric acid solution, can effectively remove impurities in the hydrofluoric acid solution, and improves the cleaning effect.

[0034] A plurality of first cleaning scraping rods 6 are arranged at equal intervals along a circular trajectory inside the concave mesh body of the microporous filter mesh frame 3. A plurality of second cleaning scraping rods 9 are arranged at equal intervals along a circular trajectory outside the convex mesh body of the guiding mesh frame 301. The plurality of first cleaning scraping rods 6 and the second cleaning scraping rods 9 can rotate synchronously in opposite directions, so that the impurities on the surfaces of the concave mesh body of the microporous filter mesh frame 3 and the convex mesh body of the guiding mesh frame 301 fall, and the impurities fall to the bottom of the relative space between the microporous filter mesh frame 3 and the guiding mesh frame 301.

[0035] Specifically, as Figure 5 、 Figure 6 shown, a rotatable first driving gear ring 5 is provided at the top of the microporous filter mesh frame 3. The top ends of the plurality of first cleaning scraping rods 6 are fixedly installed with the first driving gear ring 5. The inner side of the first driving gear ring 5 is meshed with a power gear 7 through a tooth block. As the power gear 7 rotates, the first driving gear ring 5 and the first cleaning scraping rods 6 rotate in the same direction as it. During the rotation of the first cleaning scraping rods 6, the impurities retained on the surface of the microporous filter mesh frame 3 can be pushed away. Since the microporous filter mesh frame 3 has a bowl-shaped structure, under the action of gravity, the impurities can fall to the bottom of the relative space between the microporous filter mesh frame 3 and the guiding mesh frame 301, effectively avoiding the accumulation of impurities on the surface of the microporous filter mesh frame 3 and improving the smoothness of the surface of the microporous filter mesh frame 3.

[0036] As Figure 5 、 Figure 6As shown in the figure, a second driving gear ring 8 is arranged on the inner ring line of the first driving gear ring 5 coaxially. The tops of a plurality of second cleaning scraping rods 9 are fixedly installed on the second driving gear ring 8, and the outside of the second driving gear ring 8 is meshed and connected with a power gear 7 through teeth. With the synchronous rotation of the power gear 7, the first driving gear ring 5 and the first cleaning scraping rod 6, since the power gear 7 is located in the relative space between the first driving gear ring 5 and the second driving gear ring 8, the second driving gear ring 8 and the second cleaning scraping rod 9 rotate in the opposite direction to it. During the rotation of the second cleaning scraping rod 9, the impurities remaining on the surface of the guiding wire mesh frame 301 can also be pushed away. Since the guiding wire mesh frame 301 has a hemispherical structure, under the action of gravity, the impurities can fall into the bottom of the relative space between the microporous filter wire mesh frame 3 and the guiding wire mesh frame 301, effectively avoiding the accumulation of impurities on the surface of the guiding wire mesh frame 301 and ensuring the smoothness of the surface of the guiding wire mesh frame 301.

[0037] In the above process, the combined setting of the first cleaning scraping rod 6 and the second cleaning scraping rod 9 can always leave a space for the hydrofluoric acid solution to fall on the surfaces of the microporous filter wire mesh frame 3 and the guiding wire mesh frame 301 during their operation, improving the falling speed of the hydrofluoric acid solution. During the long-term filtration operation of a large amount of low-concentration hydrofluoric acid solution in the present invention, the efficiency of the filtration operation is improved.

[0038] Moreover, in the above process, the first cleaning scraping rod 6 and the second cleaning scraping rod 9 do not interfere with each other during rotation, and a space for storing impurities can always be left at the bottom of the relative space between the microporous filter wire mesh frame 3 and the guiding wire mesh frame 301. The stored impurities will not be transferred by the first cleaning scraping rod 6 and the second cleaning scraping rod 9 in the rotating state. Furthermore, the wear of the first cleaning scraping rod 6 and the second cleaning scraping rod 9 caused by impurities can be effectively avoided, and at the same time, the resistance during the rotation of the first cleaning scraping rod 6 and the second cleaning scraping rod 9 can be reduced, improving the service life of the first cleaning scraping rod 6 and the second cleaning scraping rod 9.

[0039] Further, in this embodiment, when the first cleaning scraper rod 6 and the second cleaning scraper rod 9 rotate in opposite directions, the impurities on the concave mesh body of the microporous filter mesh frame 3 and the convex mesh body surface of the guiding mesh frame 301 can fall in two opposite directions, which can further promote the impurities from two positions to fall in the same direction compared with the impurities on the concave mesh body of the microporous filter mesh frame 3 and the convex mesh body surface of the guiding mesh frame 301. This has a shunting effect on the impurities, enabling the impurities to uniformly fall into the bottom of the relative space between the microporous filter mesh frame 3 and the guiding mesh frame 301 along different directions, slowing down the falling and accumulation speed of the impurities. During the long-term filtration operation of a large amount of low-concentration hydrofluoric acid solution in the present invention, it also has the advantage of slowing down the accumulation speed of a large amount of impurities, thereby effectively avoiding the accumulation to a certain height and affecting the smoothness of the guiding mesh frame 301 and the microporous filter mesh frame 3 on both its inner and outer sides, and further maintaining the stability of the flow rate of the large amount of low-concentration hydrofluoric acid solution during the filtration process.

[0040] As Figure 5 , Figure 6 shown, a first linkage runner 10 coaxially distributed with it is connected above the power gear 7 through a synchronous shaft 11. The first linkage runner 10 is connected to a second linkage runner 13 through a synchronous belt 12. The first linkage runner 10 and the second linkage runner 13 are in the same horizontal plane.

[0041] An electric drive rod 14 that can rotate synchronously with it is provided at the central axis position of the second linkage runner 13. The electric drive rod 14 penetrates through the sealing cover 2 and the guiding mesh frame 301 from top to bottom. A motor adapted to the electric drive rod 14 is provided outside the sealing cover 2. Therefore, when the electric drive rod 14 rotates, it can provide power for the second linkage runner 13 to make it rotate. Under the connection action of the synchronous belt 12, the first linkage runner 10, the synchronous shaft 11, and the power gear 7 can be made to rotate in the same direction as it, so as to achieve the purpose of driving the synchronous rotation of the first drive tooth ring 5 and the first cleaning scraper rod 6 and the rotation of the second drive tooth ring 8 and the second cleaning scraper rod 9 in opposite directions.

[0042] Embodiment 2: On the basis of Embodiment 1, as Figures 3-5 shown, a synchronous tooth ring 15 is provided below the microporous filter mesh frame 3. The synchronous tooth ring 15 is fixedly installed with the electric drive rod 14 through a connecting rod. And a plurality of synchronous gears 16 evenly distributed at equal intervals along the circumferential trajectory are connected to the inner side of the synchronous tooth ring 15 through tooth engagement. The synchronous gears 16 are rotatably installed on the inner wall of the filtration storage tank 1. Therefore, when the electric drive rod 14 rotates, it can drive the synchronous tooth ring 15 located below the microporous filter mesh frame 3 to rotate. Under the meshing action of the synchronous gears 16, the synchronous gears 16 themselves also rotate.

[0043] Further, in this embodiment, rotating rods 17 capable of rotating synchronously with the synchronizing gear 16 are provided at the central axis positions of the synchronizing gears 16. A plurality of rotating rods 17 and a plurality of filter elements 4 are distributed alternately. A plurality of sets of drainage rods 18 are fixed to each rotating rod 17 and distributed from top to bottom. The number of each set of drainage rods 18 is two, and the two drainage rods 18 are distributed in a V-shaped structure. As the synchronizing gear 16 rotates self-driven, the rotating rods 17 and the plurality of sets of drainage rods 18 rotate synchronously.

[0044] Since a plurality of rotating rods 17 and a plurality of filter elements 4 are distributed alternately, each rotating rod 17 and the plurality of sets of drainage rods 18 fixed thereto can fully agitate the low-concentration hydrofluoric acid solution between two adjacent filter elements 4. The flow rate of the low-concentration hydrofluoric acid solution is increased, so that a large amount of hydrofluoric acid solution can quickly and comprehensively come into full contact with the plurality of filter elements 4, and after entering the filter elements 4, it is purified by the filter elements 4, thus improving the efficiency of solution filtration and purification. During the process of filtering a large amount of low-concentration hydrofluoric acid solution, the working efficiency can be improved.

[0045] As Figure 7 shown, in order to ensure the stability of the filter element 4, in the present invention, a positioning plate 101 is fixedly installed at a position close to the lower part of the inner cavity of the filtration storage tank 1, and the filter elements 4 are fixedly installed on the positioning plate 101. At the same time, the bottom ends of the rotating rods 17 are rotatably installed on the positioning plate 101. The positioning plate 101 has a strengthening effect on the rotating rods 17, and can prevent the rotating rods 17 from being deformed during long-term operation. In order to enable the purified low-concentration hydrofluoric acid solution inside the filter element 4 to be discharged smoothly, through holes 102 adapted to the filter elements 4 are provided on the surface of the positioning plate 101. [[ID=...]]

[0046] As Figure 2 shown, a liquid outlet pipe 103 is provided at the bottom of the filtration storage tank 1. After the filtered low-concentration hydrofluoric acid solution is discharged through the through holes 102, it can be aggregated along the inclined wall below the inner cavity of the filtration storage tank 1, and then discharged to the outside of the filtration storage tank 1 through the liquid outlet pipe 103.

[0047] As Figure 3 、 Figure 4 shown, a partition plate 201 is fixedly installed inside the sealing cover 2. In order to maintain the stability of the electric drive rod 14 and the synchronizing shaft 11, in the present invention, the electric drive rod 14 and the synchronizing shaft 11 are rotatably installed on the partition plate 201. Therefore, the first linkage runner 10, the second linkage runner 13 and the synchronous belt 12 are all located above the partition plate 201, and the power gear 7 is located below the partition plate 201. Further, in order to enable the first drive gear ring 5 and the second drive gear ring 8 to rotate stably, the first drive gear ring 5 and the second drive gear ring 8 are rotatably installed below the partition plate 201.

[0048] As Figure 1 、 Figure 2As shown, a liquid inlet pipe 202 is fixedly installed on the sealing cover 2. In order to prevent the low-concentration hydrofluoric acid solution from flowing under the partition plate 201, in the present invention, the liquid inlet pipe 202 extends under the partition plate 201. The low-concentration hydrofluoric acid solution from outside the filtration storage tank 1 flows into the internal part of the microporous filter mesh frame 3 through the liquid inlet pipe 202, and is discharged after passing through the filtration operations of the microporous filter mesh frame 3, the guiding mesh frame 301 and the filter element 4.

[0049] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydrofluoric acid sampling and filtering device, comprising a filtering storage tank (1) and a sealing cover (2) arranged at the top thereof, characterized in that: Inside the filtering storage tank (1), a micro-hole filter mesh frame (3) is fixedly installed. The micro-hole filter mesh frame (3) is in a sunken bowl-shaped structure, and the center position of the micro-hole filter mesh frame (3) bulges towards the inside to form a guiding mesh frame (301). The guiding mesh frame (301) is in a hemispherical structure; Below the micro-hole filter mesh frame (3), a plurality of filter elements (4) are arranged at equal intervals along the circumferential track. The low-concentration hydrofluoric acid solution flowing into the inside of the filtering storage tank (1) falls after passing through the micro-hole filter mesh frame (3) and the guiding mesh frame (301), and is discharged to the outside of the filtering storage tank (1) after contacting the filter elements (4); Inside the sunken mesh body of the micro-hole filter mesh frame (3), a plurality of first cleaning scraping rods (6) are arranged at equal intervals along the circumferential track. Outside the bulging mesh body of the guiding mesh frame (301), a plurality of second cleaning scraping rods (9) are arranged at equal intervals along the circumferential track. The plurality of first cleaning scraping rods (6) and second cleaning scraping rods (9) can rotate synchronously in opposite directions, so that the impurities on the surfaces of the sunken mesh body of the micro-hole filter mesh frame (3) and the bulging mesh body of the guiding mesh frame (301) fall off.

2. The hydrofluoric acid sampling and filtering device according to claim 1, characterized in that: At the top of the micro-hole filter mesh frame (3), a rotatable first driving gear ring (5) is provided. The tops of the plurality of first cleaning scraping rods (6) are fixedly installed with the first driving gear ring (5). The inner side of the first driving gear ring (5) is meshed with a power gear (7) through a tooth block. As the power gear (7) rotates, the first driving gear ring (5) and the first cleaning scraping rods (6) rotate in the same direction as it.

3. The hydrofluoric acid sampling and filtering device according to claim 2, wherein: On the inner ring line of the first driving gear ring (5), a second driving gear ring (8) coaxial with it is provided. The tops of the plurality of second cleaning scraping rods (9) are fixedly installed with the second driving gear ring (8). The outer side of the second driving gear ring (8) is meshed with the power gear (7) through teeth. As the power gear (7), the first driving gear ring (5) and the first cleaning scraping rods (6) rotate synchronously, the second driving gear ring (8) and the second cleaning scraping rods (9) rotate in the opposite direction to it.

4. The hydrofluoric acid sampling and filtering device according to claim 3, wherein: Above the power gear (7), a first linkage runner (10) coaxial with it is connected through a synchronous shaft (11). The first linkage runner (10) is connected with a second linkage runner (13) through a synchronous belt (12). The first linkage runner (10) and the second linkage runner (13) are on the same horizontal plane; At the central position of the second linkage runner (13), an electric driving rod (14) that can rotate synchronously with it is provided. The electric driving rod (14) penetrates through the sealing cover (2) and the guiding mesh frame (301) from top to bottom. Outside the sealing cover (2), a motor adapted to the electric driving rod (14) is provided. When the electric driving rod (14) drives the second linkage runner (13) to rotate, the first linkage runner (10), the synchronous shaft (11) and the power gear (7) rotate in the same direction as it.

5. The hydrofluoric acid sampling and filtering device according to claim 4, characterized in that: A synchronous toothed ring (15) is provided below the microporous filter mesh frame (3). The synchronous toothed ring (15) is fixedly installed with an electric drive rod (14) through a connecting rod. Inside the synchronous toothed ring (15), a plurality of synchronous gears (16) evenly distributed at equal intervals along the circumferential trajectory are connected by tooth meshing. The synchronous gears (16) are rotatably installed on the inner wall of the filter storage tank (1). At the central axis positions of the synchronous gears (16), there are rotating rods (17) that can rotate synchronously with them. The plurality of rotating rods (17) and the plurality of filter elements (4) are staggered. On each rotating rod (17), a plurality of groups of drainage rods (18) are fixedly arranged from top to bottom. The number of each group of drainage rods (18) is two, and the two drainage rods (18) are distributed in a V-shaped structure. When the electric drive rod (14), the synchronous toothed ring (15), and the synchronous gears (16) rotate, the rotating rods (17) and the plurality of groups of drainage rods (18) rotate synchronously.

6. The hydrofluoric acid sampling and filtering device according to claim 5, characterized in that: A positioning plate (101) is fixedly installed at a lower position inside the filter storage tank (1). The filter elements (4) are all fixedly installed on the positioning plate (101). The bottom ends of the rotating rods (17) are rotatably installed on the positioning plate (101). On the surface of the positioning plate (101), there are all flow ports (102) adapted to the filter elements (4).

7. The hydrofluoric acid sampling and filtering device according to claim 6, characterized in that: A liquid outlet pipe (103) is provided at the bottom of the filter storage tank (1). The low-concentration hydrofluoric acid solution discharged through the flow ports (102) is discharged to the outside of the filter storage tank (1) through the liquid outlet pipe (103).

8. The hydrofluoric acid sampling and filtering device according to claim 4, characterized in that: An isolation plate (201) is fixedly installed inside the sealing cover (2). The electric drive rod (14) and the synchronous shaft (11) are both rotatably installed on the isolation plate (201). The first linkage runner (10), the second linkage runner (13), and the synchronous belt (12) are all located above the isolation plate (201). The power gear (7) is located below the isolation plate (201). The first drive toothed ring (5) and the second drive toothed ring (8) are rotatably installed below the isolation plate (201).

9. The hydrofluoric acid sampling and filtering device according to claim 8, characterized in that: An inlet pipe (202) is fixedly installed on the sealing cover (2). The inlet pipe (202) extends below the isolation plate (201). The low-concentration hydrofluoric acid solution from outside the filter storage tank (1) flows into the inside of the microporous filter mesh frame (3) through the inlet pipe (202).

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