Tow filter for acid bath filtration

Abstract

The invention relates to the technical field of tow filters, in particular to a tow filter for acid bath filtration, which is characterized in that an upper faceplate and a lower faceplate are arranged in a filter body, a feeding frame is arranged on the surface of an upper mouse cage plate, a material guiding frame is arranged on the side surface of the feeding frame, a fixing pipe is arranged on the surface of a lower mouse cage plate, and a positioning pipe is arranged in a mounting threaded pipe; a polypropylene silk thread bundle is inserted into the positioning pipe; the device has the beneficial effects that the polypropylene silk yarn bundles are used for filtering, the surfaces of the polypropylene silk yarn bundles are hydrophobic, the adhesion of hydrophilic impurities (such as cellulose colloid) in an acid bath can be reduced, the blocking risk is reduced, the filtering area in unit volume is large, the passing resistance of acid liquor is small, high-flow and low-pressure-difference operation can be realized, and the energy consumption is lower than that of centrifugal filtering or deep sand filtering; in addition, the polypropylene fiber silk yarn bundles can be flexibly assembled into independent filter units and are convenient to disassemble, replace and adjust, and the maintenance convenience is far better than that of a sand filter or a laminated filter.

Description

Technical Field

[0001] The present invention relates to the field of tow filters, and specifically to a tow filter for acid bath filtration. Background Art

[0002] In the production process of viscose fiber, viscose is transported to a spinning machine through certain mechanical equipment. After cellulose sulfonate meets the acid bath, it is decomposed and regenerated to form cellulose. This process is called fiber forming, usually referred to as spinning. During the spinning process, the acid bath reacts with cellulose sulfonate and yellowing by-products in the viscose to generate a large amount of colloidal sulfur. Some of this colloidal sulfur is dispersed in the acid bath in extremely fine particles, and some forms colloids floating on the bath surface. In addition, a large amount of impurities, a large number of waste glue blocks, waste silk, and other sundries brought into the viscose enter the acid bath together, making the acid bath turbid. The presence of these impurities directly affects the spinning performance and the quality of the finished product, increasing spinning defects and other adverse effects. Therefore, it is necessary to filter the acid bath through a filter during circulation to remove these impurities and improve the transparency of the acid bath.

[0003] In the prior art, traditional acid bath filtration mainly uses methods such as filter cloth / filter bag filtration, metal mesh / filter element filtration, centrifugal filtration technology, or filtration with a disc filter.

[0004] However, the filtration accuracy of traditional filter cloth, metal mesh, etc. is usually 50 - 100 microns, and it cannot effectively intercept finer fiber colloids (10 - 20 microns) in the acid bath, resulting in unstable fiber forming quality. When using centrifugal force to separate solid impurities in the acid bath, it is mostly used in the pretreatment stage, which can quickly separate large particle impurities, but has a poor filtering effect on micron-sized particles and high energy consumption. Or when using a disc filter, a filtering channel is formed by stacking grooved plastic discs to intercept impurities. It is suitable for scenarios with large fluctuations in water quality, but the discs are easily corroded by sulfides in the acid bath, and impurities are likely to remain after backwashing.

[0005] Therefore, the present invention proposes a tow filter for acid bath filtration to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a tow filter for acid bath filtration to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A tow filter for acid bath filtration, comprising: a mounting frame, a filter body is arranged on the surface of the mounting frame, a press is arranged on the side of the filter body, a compressed air pipe is arranged inside the filter body, the compressed air pipe is connected to the output end of the press, and an upper flower plate and a lower flower plate are arranged inside the filter body; Upper squirrel cage plate, with a feed frame arranged on the surface of the upper squirrel cage plate, a blanking port opened on the surface of the upper squirrel cage plate, a material guiding frame arranged in the blanking port, and a material guiding frame arranged on the side of the material guiding frame; Lower squirrel cage plate, with a fixed pipe arranged on the surface of the lower squirrel cage plate, a threaded groove opened on the surface of the fixed pipe, an installation threaded pipe screwed in the threaded groove, a positioning pipe arranged in the installation threaded pipe, and a polypropylene filament bundle inserted into the positioning pipe. The polypropylene filament bundle adopts a three-dimensional fluffy structure.

[0008] Preferably, liquid outlet holes are opened on the surfaces of both the upper flower plate and the lower flower plate. A blanking pipe is arranged in the liquid outlet hole opened on the surface of the upper flower plate, a discharge pipe is arranged on the side of the blanking pipe, one end of the discharge pipe extends into the feed frame, multiple groups of discharge pipes are arranged, and the multiple groups of discharge pipes are regularly arranged in a circular shape around the blanking pipe. Both the upper flower plate and the lower flower plate are made of steel-lined rubber material.

[0009] Preferably, positioning screw rods are arranged on the surfaces of both the upper squirrel cage plate and the lower squirrel cage plate. A support tray is fixedly connected to the surface of the positioning screw rod. The support tray is integrally in the shape of an annular plate. The positioning screw rod arranged on the surface of the upper squirrel cage plate passes through the upper flower plate, and the positioning screw rod arranged on the surface of the lower squirrel cage plate passes through the lower flower plate. A fixing nut is screwed on the surface of the positioning screw rod. The upper squirrel cage plate and the lower squirrel cage plate are respectively fixed through the cooperation of the positioning screw rod and the fixing nut.

[0010] Preferably, the monofilament diameter of the polypropylene filament bundle is 25 microns, the tensile strength is ≥4.5 cN / dtex, the porosity is ≥85%, the surface of the polypropylene filament bundle is subjected to surface modification treatment, and sulfonic acid groups (-SO3H) are introduced on the fiber surface through plasma treatment. Each bundle of the polypropylene filament bundle contains 5000 - 10000 monofilaments, and a hollow channel (with a diameter of 1 - 2 mm) is formed inside the polypropylene filament bundle to allow high-pressure fluid to penetrate the fiber during backwashing.

[0011] Preferably, ribbed plates are arranged on the surface of the lower squirrel cage plate. Multiple groups of ribbed plates are regularly arranged in a circular shape around the center point of the surface of the lower squirrel cage plate. Fixing rods are arranged at the end faces of the ribbed plates, and threads are opened on the surfaces of two of the fixing rods. The fixing rods pass through the upper squirrel cage plate.

[0012] Preferably, guide vanes are arranged on the inner side of the ribbed plates. The inclination angle between the guide vanes and the ribbed plates is 15°. A limit bearing is arranged on the surface of the upper squirrel cage plate. A limit nut is arranged on the surface of the limit bearing. The fixing rod with threads is screwed into the limit nut. The limit bearing is fixedly connected to the surface of the upper squirrel cage plate.

[0013] Preferably, fixed pipes are arranged on the surfaces of both the upper squirrel cage plate and the lower squirrel cage plate. Multiple groups of fixed pipes are fixedly connected to the surfaces of both the upper squirrel cage plate and the lower squirrel cage plate.

[0014] Preferably, the material guiding frame is fixedly connected inside the material discharging port, the end face of the material guiding frame contacts with the polypropylene filament bundle, there are multiple groups of material guiding frames, and the multiple groups of material guiding frames are linearly arranged at equal intervals on the side surface of the material guiding frame. There are multiple groups of polypropylene filament bundles, and the multiple groups of polypropylene filament bundles are arranged in a radial fan shape as a whole. An acid inlet and an acid outlet are arranged on the surface of the filter body.

[0015] Preferably, an installation nut is fixedly connected to the outer ring surface of the installation threaded pipe, a first bearing is arranged on the inner ring surface of the installation threaded pipe, a positioning pipe is fixedly connected to the inner ring surface of the first bearing, a threaded hole is formed in the side surface of the positioning pipe, a fixing bolt is arranged in the threaded hole, there are two groups of fixing bolts, and the two groups of fixing bolts are symmetrically distributed with respect to the positioning pipe.

[0016] Preferably, two groups of limiting grooves are formed in the inner side surface of the positioning pipe, and the two groups of limiting grooves are symmetrically distributed inside the positioning pipe. A clamping plate is arranged inside the positioning pipe, the end face of the clamping plate is inserted into the limiting groove, a fixed bearing is arranged on the outer side surface of the clamping plate, one end of the fixed bolt is fixedly connected to the inner ring surface of the fixed bearing, and the clamping plate is in a square plate-shaped structure.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The filament filter for acid bath filtration proposed by the present invention filters through polypropylene filament bundles during use. The surface of the polypropylene filament bundles is hydrophobic, which can reduce the adhesion of hydrophilic impurities (such as cellulose colloid) in the acid bath and reduce the risk of blockage. The polypropylene filament bundles adopt a three-dimensional fluffy structure with a porosity of over 80%. The filtration area per unit volume is large, and the resistance for acid liquid to pass through is small. It can operate at high flow rate and low pressure difference, and the energy consumption is lower than that of centrifugal filtration or deep sand filtration. The polypropylene filament bundles are arranged in a radial fan shape, which can not only intercept large particle impurities through the surface but also capture tiny particles (such as 10 + 20 micron colloid) through deep adsorption. The overall filtration accuracy is significantly higher than that of filter cloth or metal filter mesh. In addition, the polypropylene filament bundles can be flexibly assembled into independent filtration units, which is convenient for disassembly, replacement, and adjustment, and the maintenance convenience far exceeds that of sand filters or disc filters. Description of the Drawings Figure 1 It is a partial cross-sectional view of the device of the present invention; Figure 2 It is a schematic diagram of the internal structure of the device of the present invention; Figure 3 It is a schematic top view of the upper flower plate in the structure of the present invention; Figure 4 It is Figure 3 The enlarged structure schematic diagram at A in Figure 5 It is a schematic diagram of the lower cage plate structure of the present invention; Figure 6 It is a schematic diagram of the polypropylene filament bundle structure of the present invention; Figure 7Schematic diagram of the flower plate structure in the structure of the present invention; Figure 8 Schematic diagram of the partial structure of the polypropylene filament bundle in the structure of the present invention; Figure 9 Partial cross-sectional view of the structure of the present invention; Figure 10 For Figure 9 Enlarged structure diagram at position B in Figure 11 Partial cross-sectional view of the installation threaded pipe in the structure of the present invention; Figure 12 Schematic diagram of the blanking pipe structure in the structure of the present invention.

[0018] In the figure: 1. Installation frame; 2. Filter body; 3. Press; 4. Compressed air pipe; 5. Upper flower plate; 6. Lower flower plate; 7. Upper squirrel cage plate; 8. Feeding frame; 9. Guide material frame; 10. Material guiding frame; 11. Lower squirrel cage plate; 12. Fixed pipe; 13. Thread groove; 14. Installation threaded pipe; 15. Positioning pipe; 16. Polypropylene filament bundle; 17. Blanking pipe; 18. Discharge pipe; 19. Liquid outlet hole; 20. Positioning screw; 21. Fixed nut; 22. Ribbed plate; 23. Fixed rod; 24. Flow guiding blade; 25. Limit bearing; 26. Limit nut; 27. Support tray; 28. Installation nut; 29. First bearing; 30. Fixed bolt; 31. Limit groove; 32. Clamping plate; 33. Fixed bearing; 34. Acid inlet; 35. Acid outlet. Detailed implementation manners

[0019] In order to clearly and completely describe the purpose, technical solution of the present invention, and make the advantages more clear and understandable, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] Embodiment 1: Please refer to Figures 1 - 12, the present invention provides a technical solution: a filament filter for acid bath filtration, comprising: a mounting frame 1, on the surface of the mounting frame 1 there is a filter body 2, on the side of the filter body 2 there is a press 3, inside the filter body 2 there is a compressed air pipe 4, the compressed air pipe 4 is connected to the output end of the press 3, inside the filter body 2 there are an upper flower plate 5 and a lower flower plate 6; an upper cage plate 7, on the surface of the upper cage plate 7 there is a feed frame 8, on the surface of the upper cage plate 7 there is a material discharge opening, inside the material discharge opening there is a guide frame 9, on the side of the guide frame 9 there is a material guiding frame 10; a lower cage plate 11, on the surface of the lower cage plate 11 there is a fixed pipe 12, on the surface of the fixed pipe 12 there is a threaded groove 13, inside the threaded groove 13 there is a mounting threaded pipe 14 screwed, inside the mounting threaded pipe 14 there is a positioning pipe 15, inside the positioning pipe 15 there is inserted a polypropylene filament bundle 16, and the polypropylene filament bundle 16 adopts a three-dimensional fluffy structure; Filtration is carried out through the polypropylene filament bundle 16. The hydrophobicity and fluffy structure of the polypropylene filament bundle 16 can delay the rise of pressure difference. Combined with the backwashing technology (water washing or air-water mixed washing), impurities can be efficiently removed without frequent shutdown for filter media replacement. The elastic recovery characteristic of the polypropylene filament bundle 16 enables it to quickly restore its original structure after backwashing. The water consumption for cleaning is reduced by 30 - 50% compared with sand filters, and no chemical cleaning agent is required, reducing the operation cost. It can reduce the adhesion of hydrophilic impurities (such as cellulose colloid) in the acid bath and reduce the risk of blockage. The polypropylene filament bundle 16 adopts a three-dimensional fluffy structure with a porosity of over 80%. The filtration area per unit volume is large, and the resistance for acid liquid to pass through is small, enabling high-flow and low-pressure difference operation. The energy consumption is lower than that of centrifugal filtration or deep sand filtration. The polypropylene filament bundle 16 is arranged in a radial fan shape, which can intercept large particle impurities through the surface and capture tiny particles (such as 10 + 20 micron colloid) through deep adsorption. The total filtration accuracy is significantly higher than that of filter cloth or metal filter mesh. In addition, the polypropylene filament bundle 16 can be flexibly assembled into an independent filtration unit, facilitating disassembly, replacement, and adjustment, and the maintenance convenience far exceeds that of sand filters or disc filters. In addition, through the cooperation of the press 3 and the compressed air pipe 4, high-pressure gas can be conveniently provided for backwashing to achieve the purpose of removing impurities on the surface and in the depth of the polypropylene filament bundle 16.

[0021] Embodiment 2: On the basis of Embodiment 1, in order to facilitate the filtration of the acid bath, a polypropylene filament bundle 16 is provided. The monofilament diameter of the polypropylene filament bundle 16 is 25 microns, the tensile strength is ≥4.5 cN / dtex, the porosity is ≥85%, and the surface of the polypropylene filament bundle 16 is surface-modified. Sulfonic acid groups (-SO3H) are introduced on the fiber surface through plasma treatment. Each bundle of the polypropylene filament bundle 16 contains 5000 - 10000 monofilaments. A hollow channel (with a diameter of 1 - 2 mm) is formed inside the polypropylene filament bundle 16, allowing high-pressure fluid to penetrate the fiber during backwashing. Ribbed plates 22 are arranged on the surface of the lower cage plate 11. There are multiple groups of ribbed plates 22, and the multiple groups of ribbed plates 22 are regularly arranged in a circular pattern around the center point on the surface of the lower cage plate 11. Fixing rods 23 are arranged at the end faces of the ribbed plates 22. Threads are provided on the surfaces of two of the fixing rods 23. The fixing rods 23 pass through the upper cage plate 7. Guide vanes 24 are arranged on the inner side surface of the ribbed plates 22. The inclination angle between the guide vanes 24 and the ribbed plates 22 is 15°. A limit bearing 25 is arranged on the surface of the upper cage plate 7. A limit nut 26 is arranged on the surface of the limit bearing 25. The fixing rod 23 with threads is screwed into the limit nut 26, and the limit bearing 25 is fixedly connected to the surface of the upper cage plate 7; During use, the hydrophobicity and fluffy structure of the polypropylene filament bundle 16 can delay the increase in pressure difference. Combined with the backwashing technology (water washing or air-water mixed washing), impurities can be efficiently removed without frequent shutdowns for filter media replacement. The elastic recovery characteristic of the polypropylene filament bundle 16 enables it to quickly return to its original structure after backwashing. The water consumption for cleaning is 30 - 50% less than that of a sand filter, and no chemical cleaning agent is required, reducing the operating cost. The polypropylene filament bundle 16 is corrosion-resistant and fatigue-resistant, and its single service life can reach 6 - 12 months (traditional filter cloth needs to be replaced weekly), and the total maintenance cost is reduced by more than 50%. In addition, the polypropylene filament bundle 16 is a polymer material with extremely strong chemical stability and has long-term tolerance to strong acid media such as sulfuric acid and hydrochloric acid. It will not fail due to the corrosion of sulfides like a metal filter screen (such as stainless steel), and has a longer service life. When it is necessary to fix the upper cage plate 7, first, the fixing rod 23 with threads on its surface can be inserted into the upper cage plate 7 first, and then the limit nut 26 can be rotated in cooperation with the limit bearing 25, so that the fixing rod 23 can be screwed into the limit nut 26 to fix the upper cage plate 7. The guide vanes 24 arranged on the inner side surface of the ribbed plates 22 facilitate the generation of a swirl in the acid bath and enhance the impurity interception rate.

[0022] In order to facilitate the installation and fixation of the upper squirrel cage plate 7 and the lower squirrel cage plate 11, a positioning screw 20 is provided. Liquid discharge holes 19 are formed on the surfaces of the upper flower disc 5 and the lower flower disc 6. A blanking pipe 17 is arranged in the liquid discharge hole 19 formed on the surface of the upper flower disc 5. A discharge pipe 18 is arranged on the side of the blanking pipe 17. One end of the discharge pipe 18 extends into the feed frame 8. Multiple groups of discharge pipes 18 are provided, and the multiple groups of discharge pipes 18 are regularly arranged in a circular shape around the blanking pipe 17. Both the upper flower disc 5 and the lower flower disc 6 are made of steel-lined rubber material. Positioning screws 20 are arranged on the surfaces of the upper squirrel cage plate 7 and the lower squirrel cage plate 11. A support bracket 27 is fixedly connected to the surface of the positioning screw 20. The support bracket 27 is integrally in the shape of an annular plate. The positioning screw 20 arranged on the surface of the upper squirrel cage plate 7 passes through the upper flower disc 5, and the positioning screw 20 arranged on the surface of the lower squirrel cage plate 11 passes through the lower flower disc 6. A fixing nut 21 is screwed on the surface of the positioning screw 20. The upper squirrel cage plate 7 and the lower squirrel cage plate 11 are respectively fixed through the cooperation of the positioning screw 20 and the fixing nut 21. The guide frame 9 is fixedly connected in the blanking port. The end face of the guiding frame 10 contacts the polypropylene filament bundle 16. Multiple groups of guiding frames 10 are provided, and the multiple groups of guiding frames 10 are linearly arranged at equal intervals on the side of the guide frame 9. Multiple groups of polypropylene filament bundles 16 are provided, and the multiple groups of polypropylene filament bundles 16 are arranged in a radially fan-shaped manner as a whole. An acid inlet 34 and an acid outlet 35 are arranged on the surface of the filter body 2; During use, when it is necessary to install the upper squirrel cage plate 7 and the lower squirrel cage plate 11, the positioning screw 20 arranged on the surface of the upper squirrel cage plate 7 is respectively passed through the upper flower disc 5, and the positioning screw 20 arranged on the surface of the lower squirrel cage plate 11 is passed through the lower flower disc 6. Then, the fixing nut 21 can be tightened in cooperation with the support bracket 27, so that the upper squirrel cage plate 7 and the lower squirrel cage plate 11 can be fixedly installed. When it is necessary to filter by using the polypropylene filament bundle 16, first, the liquid to be filtered can be flowed into the feed frame 8 by using the discharge pipe 18, and then the discharge pipe 18 arranged on the side of the feed frame 8 can be used to guide the liquid to be filtered into the polypropylene filament bundle 16 for filtration. Embodiment 3: On the basis of Embodiment 2, in order to facilitate the fixation of the polypropylene filament bundle 16, a positioning pipe 15 is provided. A limiting groove 31 is formed on the inner side surface of the positioning pipe 15. Two groups of limiting grooves 31 are provided, and the two groups of limiting grooves 31 are symmetrically distributed inside the positioning pipe 15. A clamping plate 32 is arranged inside the positioning pipe 15. The end face of the clamping plate 32 is inserted into the limiting groove 31. A fixed bearing 33 is arranged on the outer side surface of the clamping plate 32. One end of the fixing bolt 30 is fixedly connected to the inner ring surface of the fixed bearing 33. The clamping plate 32 is in the shape of a square plate; During use, first insert one end of the polypropylene filament bundle 16 into the positioning tube 15, and then rotate the fixing bolt 30 in cooperation with the first bearing 29. Thus, the displacement of the fixing bolt 30 can be used to push the clamping plate 32 to move, and it is convenient to fixedly clamp the polypropylene filament bundle 16 by the clamping of the two clamping plates 32. One end of the clamping plate 32 is displaced in the limiting groove 31, which can avoid the problem that the clamping plate 32 also rotates when the fixing bolt 30 is rotated.

[0023] To facilitate the adjustment of the tension of the polypropylene filament bundle 16, fixing tubes 12 are provided. Fixing tubes 12 are provided on the surfaces of both the upper squirrel cage plate 7 and the lower squirrel cage plate 11. There are multiple groups of fixing tubes 12, and all the multiple groups of fixing tubes 12 are fixedly connected to the surfaces of the upper squirrel cage plate 7 and the lower squirrel cage plate 11. The outer ring surface of the mounting threaded tube 14 is fixedly connected with a mounting nut 28. The inner ring surface of the mounting threaded tube 14 is provided with a first bearing 29. The positioning tube 15 is fixedly connected to the inner ring surface of the first bearing 29. A threaded hole is formed in the side surface of the positioning tube 15, and a fixing bolt 30 is arranged in the threaded hole. There are two groups of fixing bolts 30, and the two groups of fixing bolts 30 are symmetrically distributed with respect to the positioning tube 15. During use, after the polypropylene filament bundle 16 is fixedly installed, the mounting threaded tube 14 can be rotated in cooperation with the mounting nut 28. When rotating the mounting threaded tube 14, the setting of the first bearing 29 can be used to prevent the positioning tube 15 from rotating. Then, by the distance of screwing the mounting threaded tube 14 in the threaded groove 13, the positioning tube 15 can be driven to move, and the tension of the polypropylene filament bundle 16 can be conveniently adjusted by adjusting the position of the positioning tube 15.

[0024] During actual use, filtration is carried out through the polypropylene filament bundle 16. The hydrophobicity and fluffy structure of the polypropylene filament bundle 16 can delay the increase of the pressure difference. Combined with the backwashing technology (water washing or air-water mixed washing), impurities can be efficiently removed without frequent shutdown for filter media replacement. The elastic recovery characteristic of the polypropylene filament bundle 16 enables it to quickly recover its original structure after backwashing. The water consumption for cleaning is 30 - 50% less than that of the sand filter, and no chemical cleaning agent is required, reducing the operating cost. It can reduce the adhesion of hydrophilic impurities (such as cellulose colloid) in the acid bath and reduce the risk of blockage. The polypropylene filament bundle 16 adopts a three-dimensional fluffy structure with a porosity of over 80%. The filtration area per unit volume is large, and the resistance of the acid solution passing through is small, enabling high-flow and low-pressure difference operation. The energy consumption is lower than that of centrifugal filtration or deep sand filtration. The polypropylene filament bundle 16 is arranged in a radial fan shape, which can not only intercept large particle impurities on the surface but also capture tiny particles (such as 10 + 20 micron colloid) through deep adsorption. The overall filtration accuracy is significantly higher than that of filter cloth or metal filter screens. In addition, the polypropylene filament bundle 16 can be flexibly assembled into an independent filtration unit, which is convenient for disassembly, replacement, and adjustment, and the maintenance convenience far exceeds that of the sand filter or the disc filter.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tow filter for acid bath filtration, comprising: Mounting frame (1), on the surface of the mounting frame (1) there is a filter body (2), characterized in that: on the side of the filter body (2) there is a press (3), inside the filter body (2) there is a compressed air pipe (4), the compressed air pipe (4) is connected to the output end of the press (3), inside the filter body (2) there are an upper flower plate (5) and a lower flower plate (6); Upper squirrel cage plate (7), on the surface of the upper squirrel cage plate (7) there is a feed frame (8), on the surface of the upper squirrel cage plate (7) there is a blanking opening, inside the blanking opening there is a material guiding frame (9), on the side of the material guiding frame (9) there is a material guiding frame (10); Lower squirrel cage plate (11), on the surface of the lower squirrel cage plate (11) there is a fixed pipe (12), on the surface of the fixed pipe (12) there is a threaded groove (13), inside the threaded groove (13) there is a mounting threaded pipe (14) screwed, inside the mounting threaded pipe (14) there is a positioning pipe (15), inside the positioning pipe (15) there is inserted a polypropylene filament bundle (16), and the polypropylene filament bundle (16) adopts a three-dimensional fluffy structure.

2. The tow filter for acid bath filtration according to claim 1, wherein: On the surfaces of the upper flower plate (5) and the lower flower plate (6) there are liquid discharge holes (19), inside the liquid discharge holes (19) opened on the surface of the upper flower plate (5) there is a blanking pipe (17), on the side of the blanking pipe (17) there is a discharge pipe (18), one end of the discharge pipe (18) extends into the feed frame (8), there are multiple groups of discharge pipes (18), and the multiple groups of discharge pipes (18) are regularly arranged in a circular shape around the blanking pipe (17), and both the upper flower plate (5) and the lower flower plate (6) adopt a steel-lined rubber material.

3. The tow filter for acid bath filtration according to claim 1, characterized in that: On the surfaces of the upper squirrel cage plate (7) and the lower squirrel cage plate (11) there are positioning screw rods (20), on the surface of the positioning screw rods (20) there is fixedly connected a support tray (27), and the support tray (27) is integrally in an annular plate shape. The positioning screw rods (20) arranged on the surface of the upper squirrel cage plate (7) pass through the upper flower plate (5), the positioning screw rods (20) arranged on the surface of the lower squirrel cage plate (11) pass through the lower flower plate (6), on the surface of the positioning screw rods (20) there is a fixing nut (21) screwed, and the upper squirrel cage plate (7) and the lower squirrel cage plate (11) are respectively fixed through the cooperation of the positioning screw rods (20) and the fixing nuts (21).

4. The tow filter for acid bath filtration according to claim 1, wherein: The single filament diameter of the polypropylene filament bundle (16) is 25 microns, the tensile strength ≥ 4.5 cN / dtex, the porosity ≥ 85%, the surface of the polypropylene filament bundle (16) is subjected to surface modification treatment, and sulfonic acid groups (-SO3H) are introduced on the fiber surface through plasma treatment. Each bundle of the polypropylene filament bundle (16) contains 5000 - 10000 single filaments, and a hollow channel (diameter 1 - 2 mm) is formed inside the polypropylene filament bundle (16) to allow high-pressure fluid to penetrate the fiber during backwashing.

5. The tow filter for acid bath filtration according to claim 1, characterized in that: On the surface of the lower squirrel cage plate (11) there are ribbed plates (22), there are multiple groups of ribbed plates (22), and the multiple groups of ribbed plates (22) are regularly arranged in a circular shape around the center point on the surface of the lower squirrel cage plate (11). On the end face of the ribbed plate (22) there is a fixing rod (23), and on the surfaces of two of the fixing rods (23) there is a thread, and the fixing rod (23) passes through the upper squirrel cage plate (7).

6. The tow filter for acid bath filtration according to claim 5, characterized in that: The inner side of the ribbed plate (22) is provided with a flow guiding vane (24). The flow guiding vane (24) has an inclination angle of 15° with the ribbed plate (22). The surface of the upper squirrel cage plate (7) is provided with a limit bearing (25). The surface of the limit bearing (25) is provided with a limit nut (26). The fixed rod (23) with threads is screwed into the limit nut (26). The limit bearing (25) is fixedly connected to the surface of the upper squirrel cage plate (7).

7. The tow filter for acid bath filtration according to claim 1, characterized in that: The surfaces of the upper squirrel cage plate (7) and the lower squirrel cage plate (11) are both provided with fixed pipes (12). There are multiple groups of fixed pipes (12). All the multiple groups of fixed pipes (12) are fixedly connected to the surfaces of the upper squirrel cage plate (7) and the lower squirrel cage plate (11).

8. The tow filter for acid bath filtration according to claim 1, wherein: The material guiding frame (9) is fixedly connected inside the material discharging port. The end face of the material guiding frame (10) is in contact with the polypropylene filament bundle (16). There are multiple groups of material guiding frames (10). The multiple groups of material guiding frames (10) are linearly arranged at equal intervals on the side of the material guiding frame (9). There are multiple groups of polypropylene filament bundles (16). The multiple groups of polypropylene filament bundles (16) are arranged in a radial fan shape as a whole. The surface of the filter body (2) is provided with an acid inlet (34) and an acid outlet (35).

9. The tow filter for acid bath filtration according to claim 1, wherein: The outer ring surface of the installation threaded pipe (14) is fixedly connected with an installation nut (28). The inner ring surface of the installation threaded pipe (14) is provided with a first bearing (29). The positioning pipe (15) is fixedly connected to the inner ring surface of the first bearing (29). The side of the positioning pipe (15) is provided with a threaded hole. A fixing bolt (30) is arranged in the threaded hole. There are two groups of fixing bolts (30). The two groups of fixing bolts (30) are symmetrically distributed with respect to the positioning pipe (15).

10. The tow filter for acid bath filtration according to claim 1, characterized in that: The inner side of the positioning pipe (15) is provided with limit grooves (31). There are two groups of limit grooves (31). The two groups of limit grooves (31) are symmetrically distributed inside the positioning pipe (15). A clamping plate (32) is arranged inside the positioning pipe (15). The end face of the clamping plate (32) is inserted into the limit groove (31). The outer side of the clamping plate (32) is provided with a fixed bearing (33). One end of the fixing bolt (30) is fixedly connected to the inner ring surface of the fixed bearing (33). The clamping plate (32) is in the shape of a square plate structure.

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