Microfiltration device for producing fulvic acid

Abstract

The utility model relates to the technical field of microfiltration devices, in particular to a microfiltration device for producing fulvic acid, which is characterized in that the outer surface of a microfiltration cylinder is fixedly connected with a discharge flange, a dirt collecting net is sleeved in the discharge flange, the inside of the dirt collecting net is in threaded connection with a *-shaped mounting frame, and the outer surface of the *-shaped mounting frame is fixedly connected with a nitrile rubber ring; a set of through grooves are formed in the mounting frame shaped like the Chinese character'mi ', an internal thread groove is formed in the dirt collecting net, after impurities are blocked, along with continuous injection of fulvic acid liquid, the intercepted impurities naturally flow into the discharging flange along the inclined face of the filter net under follow-up washing of fulvic acid, the dirt collecting net is mounted in the discharging flange, and when the fulvic acid liquid is continuously injected, the dirt collecting net is prevented from being blocked. Impurities are intercepted on the dirt collecting net, after long-time use, the blocking cover is taken down, the blocking cover can be directly pulled out, when the nitrile rubber ring slides and is taken out along with the dirt collecting net, the nitrile rubber ring rubs the inner wall of the discharging flange, and the impurities accumulated in the discharging flange are effectively cleaned.

Description

Technical Field

[0001] This utility model relates to the field of microfiltration device technology, and in particular to a microfiltration device for producing humic acid. Background Technology

[0002] Microfiltration devices used in the production of fulvic acid are primarily employed in the fulvic acid production process to finely filter the fulvic acid solution, removing impurities and particles to improve the purity and quality of the fulvic acid product. Fulvic acid is widely used in agriculture, medicine, environmental protection, and many other fields, and its quality directly impacts its effectiveness in each application. For example, in agriculture, high-purity fulvic acid can more effectively improve soil structure, increase fertilizer utilization, and promote plant growth; in the pharmaceutical field, fulvic acid with low impurity content helps ensure the safety and efficacy of medicines. Therefore, microfiltration devices are crucial for producing high-quality fulvic acid products and are widely used in fulvic acid production enterprises. Currently, microfiltration devices used in the practical application of fulvic acid production typically require the following technologies:

[0003] 1. High-precision filtration technology: Utilizing filter materials with appropriate pore sizes, such as microporous membranes and ceramic filter cartridges, this technology can precisely trap impurity particles in fulvic acid solutions, ensuring the product meets the required purity standards. The pore size of the filter material needs to be precisely selected based on the particle size distribution of impurities in the fulvic acid to achieve efficient filtration.

[0004] 2. Stable fluid delivery technology: This ensures that the humic acid solution passes smoothly and evenly through the filtration device, preventing poor filtration or damage to filter components due to uneven flow rates. This may involve techniques such as rationally designing the pipeline layout, selecting appropriate pumps, and controlling fluid pressure and flow rate.

[0005] 3. Impurity Separation and Collection Technology: Effectively separate the filtered impurities from the fulvic acid solution and collect them properly to prevent them from re-entering the solution or causing environmental pollution. This may include various techniques such as centrifugation, gravity sedimentation, and filter interception, with the appropriate separation method selected based on the nature and content of the impurities.

[0006] Currently, various equipment and methods are used to achieve microfiltration of fulvic acid solutions. Some small-scale production enterprises use simple screen filtration devices, where the fulvic acid solution is poured onto a screen and gravity forces the solution through, trapping impurities. This method is low-cost and easy to operate, but its filtration efficiency is low, making it difficult to guarantee the uniformity and stability of filtration. Furthermore, it is ineffective at filtering small-particle impurities, failing to meet the production requirements of high-quality fulvic acid products. Some medium-sized enterprises use plate and frame filter presses, applying pressure to force the fulvic acid solution through a filter cloth, trapping impurities. Plate and frame filter presses offer relatively good filtration and can handle large flow rates, but the equipment occupies a large area, has a long filtration cycle, and the cleaning and replacement of the filter cloth are cumbersome, increasing production time costs and labor intensity.

[0007] However, the above method has a prominent problem: cleaning the impurities inside the pipes of existing microfiltration devices used to produce fulvic acid is a challenging task, especially the inner wall of the discharge flange. Due to its special structural position, traditional cleaning methods often fail to reach it. As the key channel for material discharge, impurities gradually accumulate in the discharge flange during long-term production. These impurities not only narrow the discharge channel, hindering the smooth discharge of fulvic acid solution and reducing production efficiency, but may also cause local pressure anomalies, affecting the stability of the entire filtration system. Utility Model Content

[0008] To address the shortcomings of existing technologies, this invention provides a microfiltration device for producing fulvic acid. It solves the problem that cleaning impurities inside the pipes of existing microfiltration devices for fulvic acid production is a challenging task, especially the inner wall of the discharge flange. Due to its unique structural position, traditional cleaning methods often fail to reach it. As a key channel for material discharge, impurities gradually accumulate in the discharge flange during long-term production. These impurities not only narrow the discharge channel, hindering the smooth discharge of fulvic acid solution and reducing production efficiency, but may also cause localized pressure anomalies, affecting the stability of the entire filtration system.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A microfiltration device for producing humic acid includes a microfiltration cylinder, a discharge flange fixedly connected to the outer surface of the microfiltration cylinder, a sludge collection screen sleeved inside the discharge flange, a star-shaped mounting bracket threaded inside the sludge collection screen, a nitrile rubber ring fixedly connected to the outer surface of the star-shaped mounting bracket, a set of through grooves opened inside the star-shaped mounting bracket, and an internal threaded groove opened inside the sludge collection screen.

[0011] Preferably, the outer surface of the sewage collection net is provided with a cover.

[0012] Preferably, the discharge flange, the sludge collection screen, and the baffle are all internally threaded with a set of bolts, and a filter screen is installed inside the microfiltration cylinder.

[0013] Preferably, a U-shaped mounting bracket is fixedly connected to the outer surface of the microfilter cartridge, and a T-shaped rotating shaft is rotatably connected inside the U-shaped mounting bracket.

[0014] Preferably, the outer surface of the T-shaped rotating shaft is threaded with a clamping bolt, and the upper end of the microfiltration cylinder is provided with a cylinder cover.

[0015] Preferably, both the microfiltration cylinder and the discharge flange are equipped with inlet and outlet valves.

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

[0017] 1. After being blocked, impurities, with the continuous injection of fulvic acid, are naturally drawn along the inclined surface of the filter screen into the discharge flange under the subsequent flushing of fulvic acid. A collection screen is installed inside the discharge flange. As the fulvic acid is continuously injected, impurity particles are carried into the collection screen by the pressurized fulvic acid. The pore size of the collection screen is designed to be smaller than the particle size of the impurities in the fulvic acid. When the fulvic acid liquid containing impurities flows through the collection screen, the impurities cannot pass through the pores and are thus intercepted on the collection screen. After use, remove the cover. At this time, the sludge collection screen loses its limit and can be pulled out directly. A cross-shaped mounting bracket is installed on the outside of the sludge collection screen by screwing it on. A nitrile rubber ring is fixed on the outside of the cross-shaped mounting bracket. The surface of the nitrile rubber ring is inclined and the material is relatively hard. When the nitrile rubber ring is slid out with the sludge collection screen, the nitrile rubber ring will scrape the inner wall of the discharge flange, effectively cleaning the impurities accumulated in the discharge flange, avoiding the long-term accumulation of impurities from affecting the performance of the equipment or causing pipeline blockage, and further improving the thoroughness of maintenance and cleaning.

[0018] 2. A cap is installed at the top of the microfiltration cartridge to form a sealed space. When installing the cap, place the cap on the microfiltration cartridge, then screw the T-shaped shaft inside the U-shaped mounting bracket and tighten the cap by screwing the threaded bolts on the T-shaped shaft. The operation is simple and convenient, which helps to improve the disassembly efficiency of the cap, thereby making it easier to remove and maintain the filter screen. Attached Figure Description

[0019] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is an exploded view of the cap connection of this utility model;

[0022] Figure 3 This is an exploded view of the filter screen connection of this utility model;

[0023] Figure 4 This is an exploded view of the nitrile rubber ring connection of this utility model.

[0024] Legend: 11. Microfiltration cylinder; 12. Discharge flange; 13. Sludge collection screen; 14. Cross-shaped mounting bracket; 15. Nitrile rubber ring; 16. Through groove; 17. Internal threaded groove; 18. Cover; 19. Bolt rod; 21. Filter screen; 22. U-shaped mounting bracket; 23. T-shaped rotating shaft; 24. Anchor bolt; 25. Cylinder cover; 26. Inlet / outlet valve. Detailed Implementation

[0025] This application provides a microfiltration device for producing fulvic acid, effectively solving the problem that cleaning impurities inside the pipes of existing microfiltration devices for fulvic acid production is a challenging task, especially the inner wall of the discharge flange. Due to its special structural position, traditional cleaning methods often fail to reach it. As a key channel for material discharge, impurities gradually accumulate in the discharge flange during long-term production. These impurities not only narrow the discharge channel, hindering the smooth discharge of fulvic acid solution and reducing production efficiency, but may also cause local pressure anomalies, affecting the stability of the entire filtration system. After being blocked, the impurities, with the continuous injection of fulvic acid solution, are naturally drawn along the inclined surface of the filter screen into the discharge flange under the subsequent flushing of fulvic acid solution. A dirt collection screen is installed inside the discharge flange, which, with the continuous flow of fulvic acid solution... During continuous injection, impurity particles are carried into the humic acid liquid under pressure and enter the collection screen. The pore size of the collection screen is designed to be smaller than the particle size of the impurities in the humic acid. When the humic acid liquid containing impurities flows through the collection screen, the impurities cannot pass through the pores of the collection screen and are thus intercepted on the collection screen. After long-term use, the cover is removed, at which point the collection screen loses its limiting position and can be pulled out directly. A cross-shaped mounting bracket is installed on the outside of the collection screen by screwing it on. A nitrile rubber ring is fixed on the outside of the cross-shaped mounting bracket. The surface of the nitrile rubber ring is inclined and the material is relatively hard. When the nitrile rubber ring is slid out with the collection screen, the nitrile rubber ring will scrape the inner wall of the discharge flange, effectively cleaning the impurities accumulated in the discharge flange, avoiding the long-term accumulation of impurities from affecting equipment performance or causing pipeline blockage, and further improving the thoroughness of maintenance and cleaning.

[0026] Example

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the technical solution in this application embodiment effectively solves the problem that cleaning impurities inside pipelines in existing microfiltration devices used for producing fulvic acid is a challenging task, especially the inner wall of the discharge flange. Due to its special structural position, traditional cleaning methods often fail to reach it. As a key channel for material discharge, impurities gradually accumulate in the discharge flange during long-term production. These impurities not only narrow the discharge channel, hindering the smooth discharge of fulvic acid solution and reducing production efficiency, but may also cause localized pressure anomalies, affecting the stability of the entire filtration system. The overall concept is as follows: A microfiltration device for producing fulvic acid includes a microfiltration cylinder 11. A discharge flange 12 is fixedly connected to the outer surface of the microfiltration cylinder 11. A sludge collection screen 13 is sleeved inside the discharge flange 12. A star-shaped mounting bracket 14 is threadedly connected inside the sludge collection screen 13. A nitrile rubber ring 15 is fixedly connected to the outer surface of the star-shaped mounting bracket 14. A set of through grooves 16 is opened inside the star-shaped mounting bracket 14. An internal threaded groove 17 is opened inside the sludge collection screen 13. The star-shaped mounting bracket 14 is threaded into the internal threaded groove 17. A cover 18 is provided on the outer surface of the sludge collection screen 13. The discharge flange 12, the collection screen 13, and the cover 18 are all internally connected with a set of bolt rods 19. After being blocked, impurities, with the continuous injection of humic acid, are naturally flushed along the inclined surface of the filter screen 21 into the discharge flange 12. The discharge flange 12 is equipped with a collection screen 13. As the humic acid is continuously injected, impurity particles are carried into the collection screen 13 by the pressurized humic acid. The pore size of the collection screen 13 is designed to be smaller than the particle size of the impurities in the humic acid. When the humic acid liquid containing impurities flows through the collection screen 13, the impurities... Unable to pass through the gaps in the collection screen 13, the waste is intercepted on the collection screen 13. After prolonged use, the cover 18 is removed, at which point the collection screen 13 loses its limit and can be pulled out directly. A cross-shaped mounting bracket 14 is installed on the outside of the collection screen 13 by screwing it in. A nitrile rubber ring 15 is fixed on the outside of the cross-shaped mounting bracket 14. The surface of the nitrile rubber ring 15 is inclined and the material is relatively hard. When the nitrile rubber ring 15 is slid out with the collection screen 13, the nitrile rubber ring 15 will scrape the inner wall of the discharge flange 12, thereby more thoroughly removing the impurities accumulated in the discharge flange 12.

[0028] The microfiltration cartridge 11 contains a filter screen 21. A U-shaped mounting bracket 22 is fixedly connected to the outer surface of the microfiltration cartridge 11. A T-shaped rotating shaft 23 is rotatably connected inside the U-shaped mounting bracket 22. A locking bolt 24 is threadedly connected to the outer surface of the T-shaped rotating shaft 23. A cartridge cover 25 is provided at the upper end of the microfiltration cartridge 11. The locking bolt 24 is located on the outer surface of the cartridge cover 25. The cartridge cover 25 is installed at the upper end of the microfiltration cartridge 11 to form a sealed space. When installing the cartridge cover 25, the cartridge cover 25 is placed on the microfiltration cartridge 11. At this time, the T-shaped rotating shaft 23 inside the U-shaped mounting bracket 22 is turned, and the cartridge cover 25 is fixed by turning the locking bolt 24 threaded on the outer surface of the T-shaped rotating shaft 23. The operation is simple and convenient, which helps to improve the disassembly efficiency of the cartridge cover 25, thereby making it easier to remove and maintain the filter screen 21.

[0029] Both the microfiltration cylinder 11 and the discharge flange 12 are equipped with inlet and outlet valves 26. The humic acid solution is injected into the microfiltration cylinder 11 through the inlet and outlet valves 26 on the cylinder cover 25. The microfiltration cylinder 11 is equipped with multiple inclined filter screens 21. The humic acid solution is filtered through multiple layers of filter screens 21 to remove impurities contained in the liquid. The filtered humic acid solution is discharged through the inlet and outlet valves 26 at the lower end of the microfiltration cylinder 11 for subsequent use. Multiple discharge flanges 12 are installed on the outside of the microfiltration cylinder 11. Impurities blocked by the filter screens 21 are naturally flushed into the discharge flanges 12 along the inclined surface of the filter screens 21 by the continuous injection of humic acid solution. After a certain period of use, the cover 18 can be removed by unscrewing the bolt rod 19, at which point the impurities can be cleaned.

[0030] To address the problems existing in the prior art, this utility model provides a microfiltration device for producing fulvic acid. After impurities are blocked, with the continuous injection of fulvic acid liquid, the trapped impurities naturally flow along the inclined surface of the filter screen 21 into the discharge flange 12 under the subsequent flushing of fulvic acid. A collection screen 13 is installed inside the discharge flange 12. During the continuous injection of fulvic acid liquid, impurity particles are carried into the collection screen 13 by the pressurized fulvic acid liquid. The pore size of the collection screen 13 is designed to be smaller than the particle size of the impurities in the fulvic acid. When the fulvic acid liquid containing impurities flows through the collection screen 13, the impurities cannot pass through the pores of the collection screen 13, thus... After being intercepted on the sewage collection net 13 for a long time, the cover 18 is removed. At this time, the sewage collection net 13 loses its limit and can be pulled out directly. A star-shaped mounting bracket 14 is installed on the outside of the sewage collection net 13 by screwing it on. A nitrile rubber ring 15 is fixed on the outside of the star-shaped mounting bracket 14. The surface of the nitrile rubber ring 15 is inclined and the material is relatively hard. When the nitrile rubber ring 15 is slid out with the sewage collection net 13, the nitrile rubber ring 15 will scrape the inner wall of the discharge flange 12, effectively cleaning the impurities accumulated in the discharge flange 12, avoiding the long-term accumulation of impurities from affecting the performance of the equipment or causing pipeline blockage, and further improving the thoroughness of maintenance and cleaning.

[0031] Microfiltration cylinder 11: As the main structure of the entire microfiltration device, it provides installation space for internal components such as filter screen 21, and is connected to discharge flange 12 to form a filtration and impurity collection system for humic acid liquid.

[0032] Discharge flange 12: It is fixedly connected to the outer surface of the microfiltration cylinder 11 and is a key part for impurity collection;

[0033] Sludge collection mesh 13: Installed inside the discharge flange 12, its aperture is designed to be smaller than the particle size of impurities in fulvic acid. When fulvic acid liquid containing impurities flows through, it can accurately intercept impurities, prevent them from entering subsequent processes, and ensure the purity of fulvic acid liquid.

[0034] The star-shaped mounting bracket 14 has a nitrile rubber ring 15 fixedly connected to its outer surface. During the removal of the sludge collection net 13, the nitrile rubber ring 15 is moved, causing it to scrape against the inner wall of the discharge flange 12, thus cleaning the impurities accumulated inside the discharge flange 12 more thoroughly. A set of through grooves 16 opened inside the star-shaped mounting bracket 14 may help reduce its own weight without affecting its structural strength and support for the sludge collection net 13. It may also facilitate the flow of humic acid and impurities to some extent.

[0035] Nitrile rubber ring 15: When it is slid out with the dirt collection net 13, the nitrile rubber ring 15 contacts and scrapes against the inner wall of the discharge flange 12, which can effectively remove the impurities that have accumulated on the inner wall of the discharge flange 12 for a long time, avoid impurities from affecting the performance of the equipment or causing pipe blockage, and improve the thoroughness of maintenance and cleaning.

[0036] Channel 16: Without affecting its function of supporting the collection net 13, it makes the flow of humic acid liquid and impurities in the vicinity of the collection net 13 smoother, which helps the impurities to be better collected into the collection net 13.

[0037] Internal thread groove 17: Located inside the dirt collection screen 13, it is fixed to the dirt collection screen 13 by threaded connection with the cross-shaped mounting bracket 14, so that the two form a whole and work together to complete the work of collecting impurities and cleaning the inner wall of the discharge flange 12.

[0038] Cover 18: It is installed on the outer surface of the sewage collection screen 13 and is connected to the discharge flange 12 and the sewage collection screen 13 by a set of bolt rods 19. It serves to limit and seal the sewage collection screen 13.

[0039] Bolt rod 19: Threaded connection inside the discharge flange 12, the sludge collection screen 13 and the cover 18, tightly connecting the three together to ensure the sealing and stability of the impurity collection structure and prevent impurity leakage;

[0040] Filter screen 21: When humic acid liquid is injected into the microfiltration cylinder 11, filter screen 21 filters the humic acid liquid and blocks the impurities contained therein; the inclined placement allows the trapped impurities to flow naturally along the inclined surface of filter screen 21 into the discharge flange 12 under the subsequent flushing of humic acid liquid, and complete the collection of impurities in conjunction with the discharge flange 12 and the collection screen 13.

[0041] U-shaped mounting bracket 22: fixedly connected to the outer surface of the microfiltration cartridge 11, and internally rotatably connected to the T-shaped rotating shaft 23, providing structural support for the installation and fixation of the cartridge cover 25;

[0042] T-shaped pivot 23: When installing the cylinder cover 25, the position of the T-shaped pivot 23 can be adjusted by screwing it on, and then the cylinder cover 25 can be fixed in place by tightening the bolts 24. The rotation design of the T-shaped pivot 23 makes the installation and removal of the cylinder cover 25 more convenient and improves maintenance efficiency.

[0043] Tightening bolt 24: During the process of tightening the T-shaped rotating shaft 23, the tightening bolt 24 moves with the rotation of the T-shaped rotating shaft 23 and finally contacts the cover 25, firmly fixing the cover 25 to the microfiltration cartridge 11 and ensuring the sealing of the upper end of the microfiltration cartridge 11; at the same time, when it is necessary to remove the cover 25, simply tighten the tightening bolt 24 and the T-shaped rotating shaft 23 in the opposite direction to easily remove the cover 25;

[0044] Cap 25: Installed on the upper end of the microfiltration cartridge 11, it cooperates with the microfiltration cartridge 11 to form a sealed space, ensuring that the humic acid solution will not leak when filtered in the microfiltration cartridge 11;

[0045] Inlet / outlet valve 26: Located inside the microfiltration cylinder 11 and the discharge flange 12, the inlet / outlet valve 26 at the cylinder cover 25 on the microfiltration cylinder 11 is used to control the injection of humic acid into the microfiltration cylinder 11, while the inlet / outlet valve 26 at the lower end of the microfiltration cylinder 11 is used to discharge the filtered humic acid for subsequent use.

[0046] Working principle:

[0047] The first step involves injecting humic acid solution into the microfiltration cylinder 11 through the inlet / outlet valves 26 on the cylinder cover 25. The microfiltration cylinder 11 contains multiple inclined filter screens 21. The humic acid solution is filtered through these multiple filter screens 21 to remove impurities. The filtered humic acid solution is then discharged through the inlet / outlet valves 26 at the lower end of the microfiltration cylinder 11 for subsequent use. Multiple discharge flanges 12 are installed outside the microfiltration cylinder 11. Impurities blocked by the filter screens 21 are naturally flushed out by the humic acid solution as it is continuously injected, flowing along the inclined surfaces of the filter screens 21 into the discharge flanges 12. After a certain period of use, the bolt rod 19 is tightened to remove the cover 18, at which point the impurities can be cleaned.

[0048] The second step involves the impurities being blocked. With the continuous injection of fulvic acid, the trapped impurities are naturally flushed along the inclined surface of the filter screen 21 into the discharge flange 12. A collection screen 13 is installed inside the discharge flange 12. As the fulvic acid is continuously injected, impurity particles are carried into the collection screen 13 by the pressurized fulvic acid. The pore size of the collection screen 13 is designed to be smaller than the particle size of the impurities in the fulvic acid. When the fulvic acid liquid containing impurities flows through the collection screen 13, the impurities cannot pass through the pores and are thus intercepted. After prolonged use, the cover 18 is removed, and the collection screen 13 loses its restraint and can be pulled out directly. A star-shaped mounting bracket 14 is installed on the outside of the collection screen 13 by screwing it on. A U-shaped mounting bracket 14 is used to fix an external nitrile rubber ring 15. The surface of the nitrile rubber ring 15 is inclined and the material is relatively hard. When the nitrile rubber ring 15 is slid out with the dirt collection screen 13, the nitrile rubber ring 15 will scrape the inner wall of the discharge flange 12, thereby more thoroughly removing the impurities accumulated in the discharge flange 12. A cylinder cover 25 is installed at the upper end of the microfiltration cylinder 11 to form a sealed space. When installing the cylinder cover 25, the cylinder cover 25 is placed on the microfiltration cylinder 11. At this time, the T-shaped rotating shaft 23 inside the U-shaped mounting bracket 22 is turned, and the cylinder cover 25 is fixed by the tightening bolt 24 connected by the external thread of the T-shaped rotating shaft 23. The operation is simple and convenient, which helps to improve the disassembly efficiency of the cylinder cover 25, thereby making the removal and maintenance of the filter screen 21 more efficient.

[0049] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A microfiltration device for producing fulvic acid, comprising a microfiltration cylinder (11), the outer surface of which is fixedly connected with a discharge flange (12), characterized in that, The discharge flange (12) is sleeved with a pollution collection net (13), the pollution collection net (13) is internally threadedly connected with a rice-shaped mounting bracket (14), the rice-shaped mounting bracket (14) is fixedly connected with a nitrile rubber ring (15) on the outer surface, and a group of through grooves (16) are arranged in the rice-shaped mounting bracket (14). The pollution collection net (13) is internally provided with an internal thread groove (17).

2. The microfiltration device for producing fulvic acid according to claim 1, wherein The rice-shaped mounting bracket (14) is threadedly connected in the internal thread groove (17). The pollution collection net (13) is externally provided with a cover (18).

3. The microfiltration device for producing fulvic acid according to claim 2, wherein A group of bolt rods (19) are threadedly connected in the discharge flange (12), the pollution collection net (13) and the cover (18). The microfiltration cylinder body (11) is internally provided with a filter screen (21).

4. The microfiltration device for producing fulvic acid according to claim 3, wherein The microfiltration cylinder body (11) is fixedly connected with a U-shaped mounting bracket (22) on the outer surface. The U-shaped mounting bracket (22) is rotatably connected with a T-shaped rotating shaft (23) in the U-shaped mounting bracket (22).

5. The microfiltration device for producing fulvic acid according to claim 4, wherein The T-shaped rotating shaft (23) is threadedly connected with a pressing bolt (24) on the outer surface. The microfiltration cylinder body (11) is provided with a cylinder cover (25) on the upper end.

6. A microfiltration device for producing fulvic acid according to claim 5, wherein, The pressing bolt (24) is located on the outer surface of the cylinder cover (25). The microfiltration cylinder body (11) and the discharge flange (12) are internally provided with inlet and outlet liquid valves (26).

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