A precision filter for chemical production and processing and a processing method thereof

Abstract

The application discloses a precision filter for chemical production and processing and a processing method thereof, and relates to the technical field of sodium benzoate preparation, which comprises a fixed base, a partition disc and a cleaning assembly. The top of the fixed base is welded with a shell, the outer surface of the shell is provided with a visual window, and the left side of the shell is connected with a water inlet pipe. The precision filter for chemical production and processing and the processing method thereof have the following advantages. The preparation liquid in the shell is filtered by the outer filter shell first, and then filtered by the inner filter pipe. In addition, the top cover is moved upwards to drive the pull rod and the limiting cover to move upwards, so that the plug is separated from the plug hole, and the connecting seat is separated from the pipe. The improved precision filter is used in cooperation with the outer filter shell and the inner filter pipe, so that the double filtering purpose is achieved, the filtering effect is improved, the disassembly and assembly process of the inner filter pipe is simplified, and the regular replacement of the inner filter pipe is facilitated.

Description

Technical Field

[0001] This invention relates to the field of sodium benzoate preparation technology, specifically to a precision filter for chemical production and processing and its processing method. Background Technology

[0002] Sodium benzoate, also known as sodium benzoate, is an organic compound, a white granular or crystalline powder, stable in air and readily soluble in water. Benzoic acid and its salts are broad-spectrum antimicrobial agents, but their antibacterial effectiveness depends on the pH value of the food; their bactericidal and bacteriostatic effects increase with increasing acidity. It is mainly used as a food preservative, and also in the manufacture of pharmaceuticals and dyes. It is also used in the pharmaceutical industry and plant genetic research, serving as a dye intermediate, bactericide, and preservative.

[0003] In chemical production, the preparation of sodium benzoate requires the use of precision filters, also known as security filters. The outer shell of a precision filter is generally made of stainless steel, while the internal tubular filter elements are made of materials such as PP melt-blown, wire-burned, pleated, titanium, and activated carbon. Different filter elements are selected according to different filter media and design processes to meet the requirements of effluent water quality. Precision filters can be used for solid-liquid separation of various suspensions and have a wide range of applications, including pharmaceuticals, food, and chemicals.

[0004] For example, patent application number 202011326297.2 discloses a precision filter for chemical production and processing. This precision filter uses two contaminant guide combinations that circulate and block. When connected, external high-pressure air enters the contaminant guide combination located outside the filter cartridge, which can blow impurities and dirt off the inner wall of the filter cartridge and then discharge them through the drain pipe. Rotating the filter cartridge can open and close the two contaminant guide combinations at different positions, thus achieving cleaning and anti-clogging treatment during normal operation. However, existing precision filters similar to the above-mentioned document still have the following shortcomings:

[0005] First, existing precision filters only filter the preparation solution through a single filter element, which cannot filter impurities in stages. This not only affects the filtration effect, but also results in a low filtration speed of the preparation solution.

[0006] Secondly, the existing precision filters do not have a drainage function, which is not conducive to the smooth discharge of the preparation liquid and may affect the continuous production of sodium benzoate due to poor discharge of the preparation liquid.

[0007] Therefore, there is an urgent need to improve this shortcoming. The present invention studies and improves the existing structure and its deficiencies, and provides a precision filter for chemical production and processing and its processing method. Summary of the Invention

[0008] The purpose of this invention is to provide a precision filter for chemical production and processing and its processing method, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a precision filter for chemical production and processing, comprising a fixed base, a separator, and a cleaning assembly. The fixed base has a shell welded to its top, and a viewing window is provided on the outer surface of the shell. An inlet pipe is connected through the left side of the shell, and an outlet pipe is connected through the right side of the viewing window. The separator is fixedly installed inside the shell, and a filter element holder is fixedly connected to its top. A connecting chamber is fixedly connected to the top of the filter element holder, and a connecting pipe is fixedly connected to the top of the connecting chamber. A filter element assembly is provided on the top of the connecting chamber. A fastening clamp is connected to the outer wall of the shell, and a top cover is fixedly connected to the top of the shell via the fastening clamp. A handle is welded to the top of the top cover, and a fixed plate is fixedly connected inside the top cover. A pull rod is connected through the bottom of the fixed plate, and a limit cover is fixedly connected to the bottom end of the pull rod. A flow-guiding assembly is provided inside the shell, and a control assembly is fixedly installed on the outer wall of the shell. The cleaning assembly is located inside the filter element assembly.

[0010] Furthermore, the filter element assembly includes an outer filter housing, an inner filter tube, a connecting seat, and a plug. The inner filter tube is disposed inside the outer filter housing, and the bottom end of the inner filter tube is fixedly connected to the connecting seat, while the top end of the inner filter tube is fixedly connected to the plug.

[0011] Furthermore, the inner filter tube forms a locking structure with the through tube via a connecting seat, and the inner surface of the connecting seat fits against the outer surface of the through tube, and the internal dimensions of the connecting seat completely match the external dimensions of the through tube.

[0012] Furthermore, the limiting cover includes a cover body, a limiting plate, and an insertion hole, with the limiting plate fixed to the inner side of the cover body and the insertion hole provided at the bottom of the limiting plate.

[0013] Furthermore, the number of insertion holes and the number of through-tubes are both seven, and the limiting plates are set one-to-one with the through-tubes, with the limiting plates located directly above the through-tubes.

[0014] Furthermore, the plug is connected to the limiting plate through the insertion hole, and the shape and size of the plug match the shape and size of the insertion hole.

[0015] Furthermore, the drainage assembly includes a central rotating rod, a spiral blade, an extension rod, a drainage blade, and a guide ball. One end of the central rotating rod is movably connected to the inner wall of the housing via a bearing, and the spiral blade is fixedly connected to the outer wall of the central rotating rod. One end of the extension rod is fixedly connected to the drainage blade, which is located inside the water outlet pipe. The end of the drainage blade is welded with a guide ball, and the drainage blade and the water outlet pipe form a sliding structure through the guide ball.

[0016] Furthermore, the control assembly includes a housing, a limit frame, a servo motor, a reciprocating lead screw, and an electromagnet. The housing is fixed to the outside of the outer shell, and the limit frame is fixedly connected to the inner wall of the housing. The servo motor is fixedly installed inside the housing, and the output shaft of the servo motor is fixedly connected to the reciprocating lead screw via a coupling. One end of the reciprocating lead screw is movably connected to the inner wall of the housing via a bearing. The outer wall of the reciprocating lead screw is threadedly connected to an electromagnet, and the outer wall of the electromagnet is in contact with the inner wall of the housing.

[0017] Furthermore, the cleaning assembly includes a magnetic ring, a connecting rod, and a metal ring. The magnetic ring is attached to the inner side of the outer filter housing, and the connecting rod is fixedly connected to the inner surface of the magnetic ring. The metal ring is fixedly connected to the end of the connecting rod, and the metal ring is sleeved on the outside of the inner filter tube.

[0018] Furthermore, the processing method includes the following steps:

[0019] Step 1: The preparation solution enters the outer shell through the water inlet pipe, and after the first filtration by the outer filter shell, it enters the interior and then undergoes a second filtration through the inner filter tube.

[0020] Step 2: Start the control component. The servo motor drives the reciprocating screw, and the cover restricts the movement trajectory of the electromagnet, so that the electromagnet can reciprocate under the rotation drive of the reciprocating screw. The electromagnet uses the attraction of the magnetic ring to drive the magnetic ring to move up and down on the inside of the outer filter shell, thereby driving the metal ring to move up and down along the outer wall of the inner filter tube to clean the surface impurities.

[0021] Step 3: The liquid filtered through the inner filter tube enters the inner filter tube and passes through the connecting pipe, connecting chamber and filter element seat in sequence into the area below the separator plate. The downward force of the water flow, combined with its flow force, can drive the spiral blade to rotate, thereby driving the extension rod connected to the central spiral rod to rotate, so that the guide vane rotates inside the water outlet pipe, driving the guide ball to slide along the inner wall of the water outlet pipe. Through the rotation of the guide vane and the spiral blade, the liquid can be smoothly discharged from the outer shell through the water outlet pipe.

[0022] Step 4: After use, if maintenance or replacement of the filter element assembly is required, open the fastening clamp, then hold the handle and lift the top cover to move the pull rod and limit cover upwards, so that the plug can be pulled out from the insertion hole. Then pull up the inner filter tube to disengage the connecting seat at its bottom from the through pipe, and then pull it out from the inside of the outer filter shell.

[0023] This invention provides a precision filter for chemical production and processing, and its processing method, comprising the following features:

[0024] Beneficial effects:

[0025] 1. This invention features a filter element assembly, which consists of an outer filter housing, an inner filter tube, a connecting seat, and a plug. The preparation liquid entering the housing through the inlet pipe undergoes a first stage of filtration through the outer filter housing, where impurities are initially filtered out and remain outside the housing. The preparation liquid entering the outer filter housing then undergoes a second stage of filtration through the inner filter tube. Furthermore, by moving the top cover upwards, the pull rod and the limiting cover can be moved upwards, allowing the plug to be pulled out of the insertion hole. Since the connecting seat at the bottom of the inner filter tube engages with the through pipe, pulling the inner filter tube upwards disengages the connecting seat from the through pipe, allowing the inner filter tube to be removed. The improved precision filter achieves dual filtration through the combined use of the outer filter housing and the inner filter tube, improving the filtration effect and simplifying the disassembly and assembly process of the inner filter tube, facilitating its periodic replacement.

[0026] 2. This invention is equipped with a flow-guiding component, which consists of a central rotating rod, a spiral blade, an extension rod, a flow-guiding leaf, and a guide ball. The spiral blade rotates due to the water flow, thus guiding the flow. This, in turn, causes the central rotating rod and the extension rod to rotate, making the flow-guiding leaf rotate inside the outlet pipe. This causes the guide ball to slide along the inner wall of the outlet pipe. The rotation of the flow-guiding leaf further guides the flow inside the outlet pipe. The improved precision filter has a flow-guiding function, which facilitates the smooth discharge of the prepared liquid, improves the filter's drainage effect, and avoids the impact of poor discharge of the prepared liquid on the continuous production of sodium benzoate.

[0027] 3. This invention includes a control component consisting of a housing, a limit frame, a servo motor, a reciprocating lead screw, and an electromagnet. The servo motor drives the reciprocating lead screw, and the housing restricts the movement trajectory of the electromagnet, allowing it to reciprocate under the rotational drive of the lead screw. A cleaning component is also included, consisting of a magnetic ring, a connecting rod, and a metal ring. The electromagnet attracts the magnetic ring, causing it to move up and down along the inner side of the outer filter housing. This, in turn, moves the metal ring up and down along the outer wall of the inner filter tube, cleaning impurities. The improved precision filter can simultaneously clean impurities adhering to the inner filter tube during use, preventing impurities from affecting the filtration speed, reducing defects in the inner filter tube, maintaining its performance, and further optimizing the precision filter. Attached Figure Description

[0028] Figure 1 This is a front view schematic diagram of a precision filter for chemical production and processing according to the present invention;

[0029] Figure 2 This is a schematic diagram of the front sectional view of the outer shell of a precision filter for chemical production and processing according to the present invention;

[0030] Figure 3 This invention relates to a precision filter for chemical production and processing. Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0031] Figure 4 This is a top sectional view of a precision filter for chemical production and processing according to the present invention.

[0032] Figure 5 This is a schematic diagram showing the structure of the filter element assembly-limiting cover of a precision filter for chemical production and processing according to the present invention.

[0033] Figure 6 This is a schematic diagram of the filter element assembly-cleaning assembly structure of a precision filter for chemical production and processing according to the present invention.

[0034] In the diagram: 1. Fixed base; 2. Outer shell; 3. Viewing window; 4. Inlet pipe; 5. Outlet pipe; 6. Divider plate; 7. Filter cartridge holder; 8. Connecting compartment; 9. Through pipe; 10. Filter cartridge assembly; 101. Outer filter shell; 102. Inner filter tube; 103. Connecting seat; 104. Insert; 11. Fastening clamp; 12. Top cover; 13. Handle; 14. Fixed plate; 15. Pull rod; 16. Limiting cover; 161. Cover body; 16 2. Limiting plate; 163. Insertion hole; 17. Drainage assembly; 171. Center rotor; 172. Spiral blade; 173. Extension rod; 174. Drainage blade; 175. Guide ball; 18. Control assembly; 181. Cover; 182. Limiting frame; 183. Servo motor; 184. Reciprocating screw; 185. Electromagnet; 19. Cleaning assembly; 191. Magnetic ring; 192. Connecting rod; 193. Metal ring. Detailed Implementation

[0035] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0036] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, a precision filter for chemical production and processing and its processing method include a fixed base 1, a separator 6, and a cleaning assembly 19. A housing 2 is welded to the top of the fixed base 1, and a viewing window 3 is provided on the outer surface of the housing 2. An inlet pipe 4 is connected through the left side of the housing 2, and an outlet pipe 5 is connected through the right side of the viewing window 3. The separator 6 is fixedly installed inside the housing 2, and a filter element holder 7 is fixedly connected to the top of the separator 6. A connecting chamber 8 is fixedly connected to the top of the filter element holder 7. A connecting pipe 9 is fixedly connected to the top of the connecting chamber 8, and a filter element assembly 10 is provided on the top of the connecting chamber 8. The filter element assembly 10 includes an outer filter shell 101, an inner filter tube 102, a connecting seat 103, and a plug 104. The inner filter tube 102 is provided inside the outer filter shell 101, and the bottom end of the inner filter tube 102 is fixedly connected to the connecting seat 103. The top end of the inner filter tube 102 is fixedly connected to the plug 104. The inner filter tube 102 and the connecting pipe 9 form a locking structure through the connecting seat 103. The inner surface of connector 103 is in contact with the outer surface of pipe 9, and the internal dimensions of connector 103 are completely matched with the external dimensions of pipe 9. A fastening clamp 11 is connected to the outer wall of housing 2, and a top cover 12 is fixedly connected to the top of housing 2 via the fastening clamp 11. A handle 13 is welded to the top of top cover 12, and a fixing plate 14 is fixedly connected inside top cover 12. A pull rod 15 is connected through the bottom of fixing plate 14, and a limit cover 16 is fixedly connected to the bottom end of pull rod 15. The limit cover 16 includes... The cover 161, the limiting plate 162, and the insertion hole 163 are provided. The limiting plate 162 is fixed on the inner side of the cover 161, and the bottom of the limiting plate 162 is provided with the insertion hole 163. The number of insertion holes 163 and the number of tubes 9 are both seven. The limiting plate 162 and the tubes 9 are set one-to-one. The limiting plate 162 is located directly above the tubes 9. The plug 104 is connected to the limiting plate 162 through the insertion hole 163. The shape and size of the plug 104 match the shape and size of the insertion hole 163.

[0037] The specific operation is as follows: the preparation liquid enters the outer casing 2 through the inlet pipe 4, undergoes the first stage of filtration using the outer filter shell 101, and the filtered liquid enters the outer filter shell 101. Then, it undergoes the second stage of filtration through the inner filter tube 102, and the filtered liquid enters the inner filter tube 102. It then sequentially passes through the connecting pipe 9, the connecting chamber 8, and the filter element seat 7 into the area below the separator plate 6, and finally exits the outer casing 2 through the outlet pipe 5. Through the combined use of the outer filter shell 101 and the inner filter tube 102, the purpose of dual filtration is achieved, improving... This improves the filtration effect. In addition, the filter element assembly 10 needs to be maintained or replaced every once in a while. Open the fastening clamp 11, then hold the handle 13 and lift the top cover 12, which will drive the pull rod 15 and the limit cover 16 to move upward, so that the plug 104 can be pulled out from the insertion hole 163. Then pull up the inner filter tube 102 so that the connecting seat 103 at its bottom end is separated from the through pipe 9, and it can be pulled out from the inside of the outer filter shell 101. By simplifying the disassembly and assembly process of the inner filter tube 102, it is convenient to replace the inner filter tube 102 regularly.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, a housing 2 is welded to the top of the fixed base 1, and a viewing window 3 is provided on the outer surface of the housing 2. A water inlet pipe 4 is connected through the left side of the housing 2, and a water outlet pipe 5 is connected through the right side of the viewing window 3. A diversion assembly 17 is provided inside the housing 2. The diversion assembly 17 includes a central rotating rod 171, a spiral blade 172, an extension rod 173, a diversion leaf 174, and a guide ball 175. One end of the central rotating rod 171 is movably connected to the inner wall of the housing 2 through a bearing. The spiral blade 172 is fixedly connected to the outer wall of the central rotating rod 171. The diversion leaf 174 is fixedly connected to one end of the extension rod 173. The diversion leaf 174 is located inside the water outlet pipe 5, and a guide ball 175 is welded to the blade end of the diversion leaf 174. The diversion leaf 174 and the water outlet pipe 5 form a sliding structure through the guide ball 175.

[0039] The specific operation is as follows: the filtered preparation liquid enters the area below the separator plate 6 through the filter element seat 7. The downward force of the water flow, combined with its flow force, can drive the spiral blade 172 to rotate, which plays a guiding role and promotes the flow of the preparation liquid. At the same time, the central rotating rod 171 drives the extension rod 173 to rotate, so that the guiding blade 174 rotates inside the water outlet pipe 5, driving the guide ball 175 to slide along the inner wall of the water outlet pipe 5. The rotating guiding blade 174 further guides the liquid inside the water outlet pipe 5, which is conducive to the discharge of the preparation liquid and improves the drainage effect of the filter.

[0040] like Figure 1 , Figure 2 and Figure 6As shown, a control assembly 18 is fixedly installed on the outer wall of the outer casing 2. The control assembly 18 includes a cover 181, a limit frame 182, a servo motor 183, a reciprocating lead screw 184, and an electromagnet 185. The cover 181 is fixed to the outer side of the outer casing 2, and the limit frame 182 is fixedly connected to the inner wall of the cover 181. The servo motor 183 is fixedly installed inside the cover 181, and the output shaft of the servo motor 183 is fixedly connected to the reciprocating lead screw 184 through a coupling. One end of the reciprocating lead screw 184 is movably connected to the inner wall of the cover 181 through a bearing. An electromagnet 185 is threaded onto the outer wall of the reciprocating screw 184, and the outer wall of the electromagnet 185 is in contact with the inner wall of the housing 181. The cleaning assembly 19 is disposed inside the filter element assembly 10. The cleaning assembly 19 includes a magnetic ring 191, a connecting rod 192 and a metal ring 193. The magnetic ring 191 is disposed against the wall on the inner side of the outer filter housing 101, and the connecting rod 192 is fixedly connected to the inner surface of the magnetic ring 191. The metal ring 193 is fixedly connected to the end of the connecting rod 192, and the metal ring 193 is sleeved on the outside of the inner filter tube 102.

[0041] The specific operation is as follows: the servo motor 183 drives the reciprocating screw 184, and the cover 181 restricts the movement trajectory of the electromagnet 185, so that the electromagnet 185 can reciprocate under the rotation drive of the reciprocating screw 184. At the same time, the attraction of the electromagnet 185 to the magnetic ring 191 makes the magnetic ring 191 move up and down inside the outer filter shell 101 with the electromagnet 185, thereby driving the metal ring 193 to move up and down along the outer wall of the inner filter tube 102, cleaning the impurities attached to the outer wall of the inner filter tube 102. The cleaning component 19 is controlled to move up and down by the control component 18, which helps to maintain the use effect of the inner filter tube 102.

[0042] In summary, combining Figures 1-6As shown, the processing method of the precision filter for chemical production and processing is as follows: First, the preparation liquid enters the outer shell 2 through the inlet pipe 4, and after the first filtration by the outer filter shell 101, it enters its interior. Then, it undergoes a second filtration through the inner filter tube 102. At the same time, the control component 18 is activated, and the servo motor 183 drives the reciprocating screw 184. With the restriction of the movement trajectory of the electromagnet 185 by the cover 181, the electromagnet 185 can reciprocate under the rotation drive of the reciprocating screw 184. The attraction of the electromagnet 185 to the magnetic ring 191 causes the magnetic ring 191 to move up and down inside the outer filter shell 101, thereby causing the metal ring 193 to move up and down along the outer wall of the inner filter tube 102 to clean its surface impurities. The liquid filtered by the inner filter tube 102 then enters the inner filter tube 102 and passes through the through pipe 9, the connecting chamber 8, and the filter element in sequence. When seat 7 enters the area below the partition plate 6, the downward force of the water flow, combined with its flow force, can drive the spiral blade 172 to rotate, thereby driving the extension rod 173 connected to the central spiral rod 171 to rotate, causing the guide blade 174 to rotate inside the outlet pipe 5, driving the guide ball 175 to slide along the inner wall of the outlet pipe 5. Through the rotating guide blade 174 and spiral blade 172, the liquid can be smoothly discharged from the outer shell 2 through the outlet pipe 5. After use, if the filter element assembly 10 needs to be maintained or replaced, the fastening clamp 11 can be opened, and then the top cover 12 can be lifted by holding the handle 13, which will drive the pull rod 15 and the limiting cover 16 to move upward, so that the plug 104 can be pulled out from the insertion hole 163. Then, the inner filter tube 102 can be pulled up, so that the connecting seat 103 at its bottom end is disengaged from the through pipe 9, and it can be pulled out from the inside of the outer filter shell 101.

[0043] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A precision filter for chemical production and processing, comprising a fixed base (1), a separator (6), and a cleaning assembly (19), characterized in that, The top of the fixed base (1) is welded with a shell (2), and a viewing window (3) is provided on the outer surface of the shell (2). A water inlet pipe (4) is connected through the left side of the shell (2), and a water outlet pipe (5) is connected through the right side of the viewing window (3). The partition plate (6) is fixedly installed inside the shell (2), and a filter element seat (7) is fixedly connected to the top of the partition plate (6). A connecting chamber (8) is fixedly connected to the top of the filter element seat (7), and a connecting pipe (9) is fixedly connected to the top of the connecting chamber (8). A filter element assembly (1) is provided on the top of the connecting chamber (8). 0), the outer wall of the outer shell (2) is connected to a fastening hoop (11), and the top of the outer shell (2) is fixedly connected to a top cover (12) by the fastening hoop (11). The inside of the top cover (12) is fixedly connected to a fixing plate (14), and the bottom of the fixing plate (14) is connected to a pull rod (15). The bottom end of the pull rod (15) is fixedly connected to a limit cover (16). The inside of the outer shell (2) is provided with a drainage assembly (17), and the outer wall of the outer shell (2) is fixedly installed with a control assembly (18). The cleaning assembly (19) is located inside the filter element assembly (10). The filter element assembly (10) includes an outer filter shell (101), an inner filter tube (102), a connecting seat (103), and a plug (104). The inner filter tube (102) is provided inside the outer filter shell (101), and the connecting seat (103) is fixedly connected to the bottom end of the inner filter tube (102), and the plug (104) is fixedly connected to the top end of the inner filter tube (102). The inner filter tube (102) is connected to the through tube (9) via the connecting seat (103) to form a locking structure; The diversion assembly (17) includes a central rotating rod (171), a spiral blade (172), an extension rod (173), a diversion blade (174), and a guide ball (175). One end of the central rotating rod (171) is movably connected to the inner wall of the outer shell (2) through a bearing. The outer wall of the central rotating rod (171) is fixedly connected to the spiral blade (172), and one end of the extension rod (173) is fixedly connected to the diversion blade (174). The diversion blade (174) is located inside the outlet pipe (5). The downward force of the filtered water flow, combined with its flow force, drives the spiral blade (172) to rotate. The control component (18) includes a housing (181), a limit frame (182), a servo motor (183), a reciprocating screw (184), and an electromagnet (185). The housing (181) is fixed to the outside of the outer shell (2), and the limit frame (182) is fixedly connected to the inner wall of the housing (181). The servo motor (183) is fixedly installed inside the housing (181), and the output shaft of the servo motor (183) is fixedly connected to the reciprocating screw (184) through a coupling. One end of the reciprocating screw (184) is movably connected to the inner wall of the housing (181) through a bearing. The outer wall of the reciprocating screw (184) is threadedly connected to the electromagnet (185), and the outer wall of the electromagnet (185) is in contact with the inner wall of the housing (181). The cleaning assembly (19) includes a magnetic ring (191), a connecting rod (192) and a metal ring (193). The magnetic ring (191) is attached to the inner side of the outer filter shell (101), and the connecting rod (192) is fixedly connected to the inner surface of the magnetic ring (191). The end of the connecting rod (192) is fixedly connected to the metal ring (193), and the metal ring (193) is sleeved on the outside of the inner filter tube (102).

2. The precision filter for chemical production and processing according to claim 1, characterized in that, The limiting cover (16) includes a cover body (161), a limiting plate (162) and an insertion hole (163), and the limiting plate (162) is fixed on the inner side of the cover body (161), and the insertion hole (163) is provided at the bottom of the limiting plate (162).

3. A precision filter for chemical production and processing according to claim 2, characterized in that, The number of the insertion holes (163) and the number of the through pipes (9) are both seven, and the limiting plate (162) is set one-to-one with the through pipe (9), and the limiting plate (162) is located directly above the through pipe (9).

4. A precision filter for chemical production and processing according to claim 2, characterized in that, The plug (104) is connected to the limiting plate (162) through the socket (163), and the shape and size of the plug (104) match the shape and size of the socket (163).

5. A precision filter for chemical production and processing according to claim 1, characterized in that, The tip of the drainage blade (174) is welded with a guide ball (175), and the drainage blade (174) and the outlet pipe (5) form a sliding structure through the guide ball (175); The inner surface of the connector (103) fits against the outer surface of the tube (9), and the internal dimensions of the connector (103) perfectly match the external dimensions of the tube (9); A handle (13) is welded to the top of the top cover (12).

6. The processing method of a precision filter for chemical production and processing according to claim 1, characterized in that, The processing method includes the following steps: Step 1: The preparation solution enters the outer shell (2) through the water inlet pipe (4), and after the first filtration by the outer filter shell (101), it enters its interior and then undergoes a second filtration through the inner filter tube (102); Step 2: Start the control component (18), drive the reciprocating screw (184) through the servo motor (183), and restrict the movement trajectory of the electromagnet (185) with the cover (181), so that the electromagnet (185) can reciprocate under the rotation drive of the reciprocating screw (184), and use the attraction of the electromagnet (185) to the magnetic ring (191) to drive the magnetic ring (191) to move up and down on the inner side of the outer filter shell (101), thereby driving the metal ring (193) to move up and down along the outer wall of the inner filter tube (102) to clean the surface impurities; Step 3: The liquid filtered by the inner filter tube (102) enters the inner filter tube (102) and passes through the through pipe (9), the connecting chamber (8) and the filter element seat (7) in sequence into the area below the separator plate (6). The downward force of the water flow, combined with its flow force, can drive the spiral blade (172) to rotate, thereby driving the extension rod (173) connected to the central spiral rod (171) to rotate, so that the guide blade (174) rotates inside the water outlet pipe (5), driving the guide ball (175) to slide along the inner wall of the water outlet pipe (5). Through the rotating guide blade (174) and the spiral blade (172) for drainage, the prepared liquid can be smoothly discharged from the outer shell (2) through the water outlet pipe (5). Step 4: After use, if the filter element assembly (10) needs to be maintained or replaced, the fastening clamp (11) can be opened, and then the top cover (12) can be lifted by holding the handle (13), which will drive the pull rod (15) and the limit cover (16) to move upward, so that the plug (104) can be pulled out from the insertion hole (163). Then, the inner filter tube (102) can be pulled up so that the connecting seat (103) at its bottom end is separated from the through pipe (9), and it can be pulled out from the inside of the outer filter shell (101).

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