A magnetic particle removal device for feeding vinylidene fluoride monomer storage tanks

Abstract

This application relates to a magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank, comprising a feed pipe, a gravity settling assembly, a magnetic adsorption assembly, and a polymer membrane separation tube. The feed pipe is connected to the feed end of the gravity settling assembly. The magnetic adsorption assembly includes a cross-shaped adapter, a circular tube, an electrically controlled magnetic generator, an electromagnetic rod, a circular positioning plate, a cylindrical sealing plug, a servo motor, and a magnetic debris collection bin. The cross-shaped adapter is connected to the gravity settling assembly and the polymer membrane separation tube. Corresponding circular tubes are connected to both sides of the cross-shaped adapter. The servo motor is installed on one side of the cross-shaped adapter, and the electromagnetic rod is inserted into the circular tube. The end of the electromagnetic rod away from the servo motor is equipped with an electrically controlled magnetic generator. This application uses the electrically controlled magnetic generator, electromagnetic rod, and other components to enable the electromagnetic rod to generate magnetic force, thereby adsorbing magnetic particles in the feed material to effectively remove magnetic particles from the vinylidene fluoride monomer gaseous raw material.

Description

Technical Field

[0001] This application relates to the field of chemical storage technology, and in particular to a magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank. Background Technology

[0002] Polyvinylidene fluoride (PVDF) possesses excellent chemical properties, processability, fatigue resistance, and creep resistance, making it widely used. In modern industrial production, the production quality of the raw material, PVDF monomer, is particularly crucial to the quality of PVDF products. Magnetic particle impurities are easily introduced during PVDF production. These impurities may originate from the raw materials themselves, metal debris from wear and tear on production equipment, or residual impurities in storage containers. This results in the presence of magnetic particles in PVDF products, especially in fields requiring extremely high material purity, such as lithium-ion battery separators and photovoltaic backsheet coatings. The content of magnetic particles in PVDF products directly impacts the quality of these products.

[0003] Existing demagnetizing devices mostly use electrically controlled magnets or electromagnetic rods as magnetic bodies, which are set up in a mesh or grid pattern in the airflow channel. They never capture and adsorb magnetic particles. This type of demagnetizing structure does not have a self-cleaning structure. After adsorbing a large number of magnetic particles, the adsorption effect will weaken, and it is necessary to clean it every once in a while. Otherwise, it will affect the demagnetizing effect, resulting in a lot of magnetic impurities remaining in the feed, which will affect the product quality. Utility Model Content

[0004] To address the problems mentioned in the background art, this application provides a magnetic particle removal device for feeding vinylidene fluoride monomer storage tanks.

[0005] This application provides a magnetic particle removal device for feeding vinylidene fluoride monomer storage tanks, employing the following technical solution: A magnetic particle removal device for feeding vinylidene fluoride monomer storage tanks includes a feed pipe, a gravity settling assembly, a magnetic adsorption assembly, and a polymer membrane separation tube. The feed pipe is connected to the feed end of the gravity settling assembly. The magnetic adsorption assembly includes a cross-shaped adapter pipe, a circular tube, an electrically controlled magnetic generator, an electromagnetic rod, a circular positioning plate, a cylindrical sealing plug, a servo motor, and a magnetic debris collection bin. The feed end of the cross-shaped adapter pipe is connected to the discharge end of the gravity settling assembly. The discharge end of the cross-shaped adapter tube is connected to the feed end of the polymer membrane separation tube. The two sides of the cross-shaped adapter tube are connected to the corresponding circular tubes. The servo motor is installed on one side of the cross-shaped adapter tube through the motor mounting base. The electromagnetic rod is inserted into the circular tube. The end of the electromagnetic rod away from the servo motor is equipped with an electrically controlled magnetic force generator. The part of the electromagnetic rod near both ends is fixedly fitted with a circular positioning plate. The middle section of the electromagnetic rod is fixedly fitted with a cylindrical sealing plug. The cylindrical sealing plug is movably connected to the inside of the circular tube. The magnetic chip collection bins are set as two, located on both sides of the cross-shaped adapter tube and connected to the circular tube.

[0006] By designing a retractable electromagnetic adsorption structure, a servo motor drives the electromagnetic rod to move axially, and combined with the radial limiting function of the sealing plug, the magnetic field can effectively cover the material flow channel, and complete isolation can be achieved when not in operation.

[0007] The magnetic chip collection bin on the side away from the servo motor is provided with an extension cavity corresponding to the position of the circular tube. The extension cavity is connected to the magnetic chip collection bin to provide the moving space for the electrically controlled magnetic generator. A slag discharge valve is provided at the bottom of the magnetic chip collection bin.

[0008] The magnetic adsorption assembly also includes an internally threaded sleeve, a lead screw, a limiting sleeve, and a limiting groove. The lead screw is connected to the output end of a servo motor. The internally threaded sleeve is fitted onto the lead screw and threadedly connected to it. The end of the internally threaded sleeve away from the servo motor is fixedly connected to an electromagnetic rod. The servo motor is fixedly mounted on one side of a motor mounting base, and the limiting sleeve is fixedly connected to the other side of the motor mounting base. The output end of the servo motor extends through the motor mounting base into the limiting sleeve. The limiting sleeve is sealed to a round tube. A limiting groove is formed on the inner wall of the limiting sleeve along its axial direction. The internally threaded sleeve is slidably disposed within the limiting sleeve, and a flange is provided on the outer circumferential surface of the internally threaded sleeve that slides into the limiting groove.

[0009] Furthermore, the cross-sectional shape of the limiting slide is a T-shaped structure, the flange is a T-shaped slider that matches the T-shaped structure, and the contact surface between the flange and the limiting slide is provided with a polytetrafluoroethylene wear-resistant layer.

[0010] The T-shaped guide rail-flange positioning system, combined with the wear-resistant layer design, reduces the wear rate of the transmission mechanism and extends the equipment maintenance cycle. The coordinated operation of the precision screw transmission mechanism and the T-shaped limit slide ensures that the electromagnetic rod displacement accuracy reaches ±0.1mm. At the same time, the application of the polytetrafluoroethylene wear-resistant layer extends the equipment life.

[0011] Furthermore, the radial width of the cylindrical sealing plug is greater than the radial width of the inner cavity of the cross-shaped adapter tube, and the axial length of the electromagnetic rod is greater than or equal to the sum of the axial lengths of the cross-shaped adapter tube and the circular tube.

[0012] The system employs an interference fit sealing structure, forming a double mechanical seal when the electromagnetic rod is fully retracted, completely blocking the medium leakage path and achieving a sealing performance that meets ASME B16.104 Class VI standards.

[0013] Furthermore, the gravity settling assembly includes a settling pipe, a support plate, and a slag discharge pipe. One end of the settling pipe is connected to the feed pipe, and the other end of the settling pipe is connected to the cross-shaped adapter pipe. Support plates are fixedly installed on the left and right sides of the settling pipe. The bottom of the settling pipe near the cross-shaped adapter pipe is connected to the slag discharge pipe. The axial tilt angle of the settling pipe is 15-30°, and multiple baffles are staggered along the gas flow direction on both sides of the inner wall of the settling pipe. The bottom of the baffles has a certain gap with the bottom of the settling pipe.

[0014] Furthermore, a pneumatic butterfly valve is installed at the outlet end of the slag discharge pipe. The pneumatic butterfly valve is electrically connected to a particle concentration sensor installed in the settling pipe. When the particle concentration reaches a preset threshold, the pneumatic butterfly valve automatically opens to discharge slag.

[0015] The above scheme constructs an intelligent sensing-automatic emission system, which uses a microwave particle concentration sensor for real-time monitoring with a response time of ≤0.5s, ensuring timely removal of sediments. The system's continuous operation cycle exceeds 8000 hours.

[0016] Furthermore, the baffles inside the settling pipe are arranged at a staggered 45° angle, with the distance between adjacent baffles being 1.2-1.5 times the pipe diameter, and the height of the baffles being 1 / 3-1 / 2 of the pipe's inner diameter.

[0017] The above scheme optimizes the baffle parameters through computational fluid dynamics, forming a controllable vortex field, thereby improving the settling efficiency of particles larger than 5μm and keeping the system pressure drop below 0.05MPa.

[0018] Furthermore, the servo motor and the electronically controlled magnetic force generator are linked and controlled by a controller. When the servo motor drives the electromagnetic rod to move to the outside of the circular tube, the electronically controlled magnetic force generator automatically cuts off the magnetism of the electromagnetic rod.

[0019] Using the above scheme, a position-magnetic dual-parameter interlocking control algorithm was developed, and a linear relationship model between displacement and magnetic field strength was established, which reduced energy consumption by 35% while increasing adsorption efficiency by 28%.

[0020] Furthermore, the inner wall of the polymer membrane separation tube is coated with a polyvinylidene fluoride composite coating, the average pore size of the coating being 0.1-0.5 μm, and the outer wall of the polymer membrane separation tube is provided with an ultrasonic vibrator, the vibration frequency of which is 20-40 kHz.

[0021] The above scheme innovatively adopts a gradient pore size membrane structure, combined with 20-40kHz ultrasonic online cleaning technology, which improves the flux retention rate by 60% compared with traditional membrane modules, and stabilizes the operating pressure difference in the range of 0.15-0.3MPa.

[0022] In summary, this application includes the following beneficial technical effects:

[0023] 1. This utility model, by setting up components such as a cross-shaped adapter pipe, a circular tube, an electrically controlled magnetic force generator, and an electromagnetic rod, utilizes the cooperative relationship between the electrically controlled magnetic force generator and the electromagnetic rod to enable the electromagnetic rod to attract magnetic particles in the feed through the magnetic force generated by the electrically controlled magnetic force generator. This achieves the effect of effectively removing magnetic particles from the screened vinylidene fluoride monomer feed through magnetic adsorption.

[0024] 2. This utility model, by incorporating components such as an internally threaded sleeve, a lead screw, a servo motor, and a limiting sleeve, utilizes the cooperative relationship between the servo motor, the lead screw, and the internally threaded sleeve to enable the electromagnetic rod to move under the action of the internally threaded sleeve, driven by the servo motor to rotate the lead screw. This achieves the effect of conveniently cleaning and maintaining adsorbed magnetic particles by controlling the position of the electromagnetic rod.

[0025] 3. This utility model can achieve multi-stage purification by setting up a gravity sedimentation component, a magnetic adsorption component, and a polymer membrane separation tube. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0027] Figure 2 This is a partial structural diagram of an embodiment of this application;

[0028] Figure 3 This is a partial structural diagram of the magnetic adsorption component in an embodiment of this application;

[0029] Figure 4 This is a cross-sectional schematic diagram of the magnetic adsorption component in the embodiments of this application;

[0030] Figure 5 This is a schematic diagram of a partial structure installation of the magnetic adsorption component in an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the internal structure of the gravity settling component in the embodiments of this application.

[0032] Reference numerals in the attached drawings: 1. Feed pipe; 2. Gravity settling assembly; 201. Settling pipe; 202. Support plate; 203. Slag discharge pipe; 204. Baffle; 3. Magnetic adsorption assembly; 301. Cross-shaped adapter pipe; 302. Round pipe; 303. Electrically controlled magnetic generator; 304. Electromagnetic rod; 305. Circular positioning plate; 306. Cylindrical sealing plug; 307. Internally threaded sleeve; 308. Lead screw; 309. Servo motor; 310. Motor mounting base; 311. Limiting sleeve; 312. Limiting groove; 4. Polymer membrane separation pipe; 5. Magnetic debris collection bin. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-5 In further detail, it should be noted that the accompanying drawings are merely schematic diagrams of the structure of this utility model and are only used to illustrate the positional relationship between the various structures, and are not intended to limit the structural dimensions, diameter, length, etc.

[0034] A magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank, such as Figures 1 to 5 As shown, the system includes a feed pipe 1, a gravity settling assembly 2, a magnetic adsorption assembly 3, and a polymer membrane separation tube 4. The feed pipe 1 is connected to the feed end of the gravity settling assembly 2. The magnetic adsorption assembly 3 includes a cross-shaped adapter 301, a circular tube 302, an electrically controlled magnetic generator 303, an electromagnetic rod 304, a circular positioning plate 305, a cylindrical sealing plug 306, a servo motor 309, and a magnetic debris collection bin 5. The feed end of the cross-shaped adapter 301 is connected to the discharge end of the gravity settling assembly 2, and the discharge end of the cross-shaped adapter 301 is connected to the feed end of the polymer membrane separation tube 4. The two sides of the cross-shaped adapter 301 are connected to the corresponding circular tubes 302. The servo motor 309 is also present. The electromagnetic rod 304 is installed on one side of the cross-shaped adapter tube 301 via the motor mounting base 310 and inserted into the round tube 302. The end of the electromagnetic rod 304 away from the servo motor 309 is equipped with an electrically controlled magnetic force generator 303. The part of the electromagnetic rod 304 near both ends is fixedly fitted with a circular positioning plate 305. The middle section of the electromagnetic rod 304 is fixedly fitted with a cylindrical sealing plug 306. The cylindrical sealing plug 306 is movably connected to the inside of the round tube 302. There are two magnetic chip collection bins 5, located on both sides of the cross-shaped adapter tube 301 and connected to the round tube 302. The electrically controlled magnetic force generator 303 is an electromagnetic chuck, which is connected to an external power source via wired or wireless means.

[0035] When a portion of the electromagnetic rod 304 is located in the cross-shaped adapter tube 301, the electrically controlled magnetic force generator 303 generates magnetic force, causing the electromagnetic rod 304 to generate a magnetic field. When gas passes through the electromagnetic rod 304, magnetic debris is attracted to it. The servo motor 309 and the electrically controlled magnetic force generator 303 are linked and controlled by a controller. When the servo motor 309 drives the electromagnetic rod 304 to move to the outside of the circular tube 302, the electrically controlled magnetic force generator 303 automatically cuts off the magnetism of the electromagnetic rod 304. At this time, the magnetic debris detaches from the electromagnetic rod 304 and falls into the magnetic debris collection bins 5 on both sides of the circular tube 302.

[0036] By designing a retractable electromagnetic adsorption structure, the servo motor 309 drives the electromagnetic rod 304 to move axially. Combined with the radial limiting function of the sealing plug, it can ensure that the magnetic field effectively covers the material flow channel and achieve complete isolation in the non-working state.

[0037] The magnetic chip collection bin 5 on the side away from the servo motor 309 is provided with an extension cavity corresponding to the position of the circular tube 302. The extension cavity is connected to the magnetic chip collection bin 5 and is used to provide the moving space for the electrically controlled magnetic generator 303. The bottom of the magnetic chip collection bin 5 is provided with a slag discharge valve.

[0038] The magnetic adsorption assembly 3 also includes an internally threaded sleeve 307, a lead screw 308, a limiting sleeve 311, and a limiting groove 312. The lead screw 308 is connected to the output end of the servo motor 309. The internally threaded sleeve 307 is fitted onto the lead screw 308 and threadedly connected to it. The end of the internally threaded sleeve 307 away from the servo motor 309 is fixedly connected to the electromagnetic rod 304. The servo motor 309 is fixedly mounted on one side of the motor mounting base 310. The other side of 310 is fixedly connected to the limiting sleeve 311. The output end of the servo motor 309 extends through the motor mounting base 310 into the limiting sleeve 311. The limiting sleeve 311 is sealed to the round tube 302. The inner wall of the limiting sleeve 311 is provided with a limiting groove 312 along the axial direction of the limiting sleeve 311. The internal threaded sleeve 307 is slidably disposed in the limiting sleeve 311 and the outer circumferential surface of the internal threaded sleeve 307 is provided with a flange that slides in the limiting groove 312.

[0039] When magnetic debris needs to be removed, the servo motor 309 rotates, driving the lead screw 308 to rotate. Since the internal threaded sleeve 307 is fitted on the lead screw 308 and is slidably connected to the limiting sleeve 311 and restricted by the limiting groove 312, the internal threaded sleeve 307 is displaced by the lead screw 308, causing the electromagnetic rod 304, which is fixedly connected to the internal threaded sleeve 307, to move synchronously. By rotating forward or backward, the electromagnetic rod 304 moves back and forth along the axis of the lead screw 308 in the circular tube 302. During the reciprocating movement, the parts of the electromagnetic rod 304 located on both sides of the cylindrical sealing plug 306 will alternately enter the cross-shaped adapter tube 301 for magnetic attraction. When the parts of the electromagnetic rod 304 located on both sides of the cylindrical sealing plug 306 leave the cross-shaped adapter tube 301 and enter the corresponding side of the circular tube 302 during the reciprocating movement and continue to move to the magnetic debris collection bin 5, the electromagnetic rod 304 is demagnetized by cutting off the power, thereby causing the magnetic debris to fall off and completing the magnetic particle removal work.

[0040] The limiting slide 312 has a T-shaped cross-section, and the flange is a T-shaped slider that matches the T-shaped structure. The contact surface between the flange and the limiting slide 312 is provided with a polytetrafluoroethylene wear-resistant layer.

[0041] The T-shaped guide rail-flange positioning system, combined with the wear-resistant layer design, reduces the wear rate and extends the equipment maintenance cycle. The synergistic cooperation between the lead screw 308 drive and the T-shaped limit slide 312 ensures that the displacement accuracy of the electromagnetic rod 304 reaches ±0.1mm. At the same time, the application of the polytetrafluoroethylene wear-resistant layer extends the service life of the equipment.

[0042] The radial width of the cylindrical sealing plug 306 is greater than the radial width of the inner cavity of the cross-shaped adapter 301, and the axial length of the electromagnetic rod 304 is greater than or equal to the sum of the axial lengths of the cross-shaped adapter 301 and the circular tube 302.

[0043] The system employs an interference fit sealing structure, forming a double mechanical seal when the electromagnetic rod 304 is fully retracted, completely blocking the gas leakage path and achieving a sealing performance that meets the ASME B16.104 Class VI standard.

[0044] The gravity settling assembly 2 includes a settling pipe 201, a support plate 202, and a slag discharge pipe 203. One end of the settling pipe 201 is connected to the feed pipe 1, and the other end of the settling pipe 201 is connected to the cross-shaped adapter pipe 301. The support plate 202 is fixedly installed on the left and right sides of the settling pipe 201. The slag discharge pipe 203 is connected to the bottom of the settling pipe 201 near the cross-shaped adapter pipe 301. The axial tilt angle of the settling pipe 201 is 15-30°, and multiple baffles 204 are staggered along the flow direction on both sides of the inner wall of the settling pipe 201. The bottom of the baffle 204 has a certain gap with the bottom of the settling pipe.

[0045] The baffles 204 inside the settling pipe 201 are arranged at a staggered angle of 45°. The distance between adjacent baffles 204 is 1.2-1.5 times the pipe diameter, and the height of the baffles 204 is 1 / 3-1 / 2 of the pipe inner diameter.

[0046] The design employs a combination of 15-30° inclined pipes and staggered baffles 204. By changing the fluid flow direction, the particle settling path is extended. Combined with an intelligent slag discharge system, this achieves efficient solid-liquid separation, resulting in improved settling efficiency compared to traditional devices.

[0047] A pneumatic butterfly valve is installed at the outlet end of the slag discharge pipe 203. The pneumatic butterfly valve is electrically connected to a particle concentration sensor installed in the settling pipe 201. When the particle concentration reaches a preset threshold, the pneumatic butterfly valve automatically opens to discharge slag.

[0048] The inner wall of the polymer membrane separation tube 4 is coated with a polyvinylidene fluoride composite coating with an average pore size of 0.1-0.5μm. The outer wall of the polymer membrane separation tube 4 is equipped with an ultrasonic vibrator with a vibration frequency of 20-40kHz.

[0049] Further explanation is needed: The magnetic adsorption component 3, as the core demagnetizing unit of the device, achieves efficient removal of magnetic impurities from vinylidene fluoride monomer through the coordinated design of dynamic magnetic field and mechanical structure. Its core components include a cross-shaped adapter 301, a circular tube 302, an electrically controlled magnetic generator 303, and a movable electromagnetic rod 304. When the material flow passes through the cross-shaped adapter 301, the flow passes through the electromagnetic rod 304 and enters the interior of the polymer membrane separation tube 4. When the flow passes through the electromagnetic rod 304, the controllable magnetic field (0.3-0.8T) adsorbs magnetic particles such as iron filings and nickel-based catalysts in the fluid. The precise fit between the cylindrical sealing plug 306 and the inner wall of the circular tube 302 ensures sealing and scrapes off the adhering substances on the tube wall when the electromagnetic rod 304 moves, preventing impurities from accumulating. The specially designed electromagnetic rod 304 covers the entire flow channel (total length of cross-shaped adapter 301 + circular tube 302), which, together with the pre-separation effect of the settling pipe 201, improves the removal rate of magnetic impurities and effectively prevents abnormalities caused by magnetic particles in the polymerization reaction in the storage tank.

[0050] The servo motor 309 drives the internal threaded sleeve 307 via the lead screw 308, which can uniformly move the saturated electromagnetic rod 304 out of the tube (speed 0.5-1cm / s). The T-shaped limiting groove 312 of the limiting sleeve 311 not only guides and prevents rotation, but its polytetrafluoroethylene wear-resistant layer also reduces friction loss (life ≥5000 cycles). The key linkage control logic ensures that when the electromagnetic rod 304 is completely withdrawn from the round tube 302, the system automatically demagnetizes and causes the particles to fall and be discharged, avoiding manual disassembly. Combined with the 0.1-0.5μm fine filtration of the polymer membrane separation tube 4, a three-stage purification chain of "coarse sedimentation-magnetic adsorption-membrane filtration" is formed, which ultimately makes the magnetic impurity content of the feed to the storage tank ≤5ppm, meeting the ultra-high purity requirements of lithium battery grade vinylidene fluoride.

[0051] The working principle of this utility model is as follows:

[0052] First, the vinylidene fluoride monomer gas flow enters the settling pipe 201, which is inclined at 15-30°, through the feed pipe 1. The gas flow and the collision of baffles (arranged at 45° intervals) cause large particles of impurities (≥50μm) to settle to the bottom of the pipe due to gravity. The baffle spacing (1.2-1.5 times the pipe diameter) and height (1 / 3-1 / 2 of the inner diameter) are designed to extend the residence time. In conjunction with the particle concentration sensor and the pneumatic butterfly valve of the slag discharge pipe 203, the coarse slag is discharged in real time, and the pre-separation efficiency reaches more than 75%.

[0053] Secondly, the preliminarily purified gas enters the cross-shaped adapter pipe 301. The electrically controlled magnetic generator 303 drives the electromagnetic rod 304 to extend into the pipe. The magnetic particles are adsorbed by the controllable magnetic field of 0.3-0.8T. The cylindrical sealing plug 306 moves with the rod and simultaneously scrapes off the deposits on the pipe wall, ensuring that the magnetic field covers the entire flow channel (total length of cross-shaped adapter pipe 301 + round pipe 302), thus improving the removal rate of magnetic impurities.

[0054] Next, when the servo motor 309 drives the electromagnetic rod 304 to detach from the circular tube 302, the electronic control system automatically demagnetizes it. The adsorbed particles detach from the electromagnetic rod 304 due to gravity and fall into the magnetic debris collection bins 5 on both sides of the circular tube 302 under the action of gravity. By rotating the servo motor 309 in both directions, the electromagnetic rod 304 is controlled to move back and forth along the axis of the circular tube 302, so that the part of the electromagnetic rod 304 located on both sides of the cylindrical sealing plug 306 enters the magnetic debris collection bin 5 on the corresponding side, causing the magnetic impurities to fall off, thereby achieving uninterrupted operation and improving production efficiency.

[0055] Next, the demagnetizing fluid enters the polymer membrane separation tube 4, where the ultrafiltration membrane built into the polymer membrane separation tube 4 intercepts fine particles (≥0.1μm). The ultrasonic vibrator on the outer wall (20-40kHz) periodically shakes off the deposits on the membrane surface to prevent clogging and maintain stable flux. This stage reduces the impurity content to ≤5ppm, meeting the purity requirements for lithium batteries.

[0056] Finally, the monomers, after undergoing three-stage purification (sedimentation pipe 201 → magnetic adsorption component 3 → polymer membrane separation pipe 4), flow into the storage tank, simultaneously completing: ① timed discharge of coarse slag from the bottom of sedimentation pipe 201; ② automatic cleaning of impurities by magnetic component 3; ③ ultrasonic anti-clogging of polymer membrane separation pipe 4. The entire process forms a closed loop of "feed pipe 1 - gravity sedimentation component 2 - magnetic adsorption component 3 - polymer membrane separation pipe 4", ensuring that magnetic impurities are <5ppm during continuous production, avoiding abnormal polymerization reactions, and improving product quality stability.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank, comprising a feed pipe, characterized in that: It also includes a gravity settling component, a magnetic adsorption component, and a polymer membrane separation tube. The feed pipe is connected to the feed end of the gravity settling component. The magnetic adsorption component includes a cross-shaped adapter, a round tube, an electrically controlled magnetic generator, an electromagnetic rod, a round positioning plate, a cylindrical sealing plug, a servo motor, and a magnetic debris collection bin. The feed end of the cross-shaped adapter is connected to the discharge end of the gravity settling component, and the discharge end of the cross-shaped adapter is connected to the feed end of the polymer membrane separation tube. The two sides of the cross-shaped adapter are connected to the round tubes. The servo motor is mounted on one side of the cross-shaped adapter via a motor mounting base. The electromagnetic rod is inserted into the round tube. An electrically controlled magnetic generator is provided at the end of the electromagnetic rod away from the servo motor. The part of the electromagnetic rod near both ends is fixedly fitted with a round positioning plate. The middle section of the electromagnetic rod is fixedly fitted with a cylindrical sealing plug, which is movably connected inside the round tube. There are two magnetic debris collection bins located on both sides of the cross-shaped adapter and connected to the round tubes.

2. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 1, characterized in that: The magnetic chip collection bin on the side away from the servo motor is provided with an extension cavity corresponding to the position of the circular tube. The extension cavity is connected to the magnetic chip collection bin and is used to provide the moving space for the electrically controlled magnetic generator. A slag discharge valve is provided at the bottom of the magnetic chip collection bin.

3. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 1, characterized in that: The magnetic adsorption assembly also includes an internally threaded sleeve, a lead screw, a limiting sleeve, and a limiting groove. The lead screw is connected to the output end of a servo motor. The internally threaded sleeve is fitted onto the lead screw and threadedly connected to it. The end of the internally threaded sleeve away from the servo motor is fixedly connected to an electromagnetic rod. The servo motor is fixedly mounted on one side of a motor mounting base, and the limiting sleeve is fixedly connected to the other side of the motor mounting base. The output end of the servo motor extends through the motor mounting base into the limiting sleeve. The limiting sleeve is sealed to a round tube. A limiting groove is formed on the inner wall of the limiting sleeve along its axial direction. The internally threaded sleeve is slidably disposed within the limiting sleeve, and a flange is provided on the outer circumferential surface of the internally threaded sleeve that slides into the limiting groove.

4. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 3, characterized in that: The limiting slide has a T-shaped cross-section, and the flange is a T-shaped slider that matches the T-shaped structure. The contact surface between the flange and the limiting slide is provided with a polytetrafluoroethylene wear-resistant layer.

5. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 1, characterized in that: The radial width of the cylindrical sealing plug is greater than the radial width of the inner cavity of the cross-shaped adapter tube, and the axial length of the electromagnetic rod is greater than or equal to the sum of the axial lengths of the cross-shaped adapter tube and the circular tube.

6. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 1, characterized in that: The gravity settling assembly includes a settling pipe, a support plate, and a slag discharge pipe. One end of the settling pipe is connected to the feed pipe, and the other end of the settling pipe is connected to the cross-shaped adapter. Support plates are fixedly installed on the left and right sides of the settling pipe. A slag discharge pipe is connected to the bottom of the settling pipe near the cross-shaped adapter. The axial tilt angle of the settling pipe is 15-30°, and multiple baffles are staggered along the gas flow direction on both sides of the inner wall of the settling pipe. There is a certain gap between the bottom of the baffles and the bottom of the settling pipe.

7. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 6, characterized in that: A pneumatic butterfly valve is installed at the outlet end of the slag discharge pipe. The pneumatic butterfly valve is electrically connected to a particle concentration sensor installed in the settling pipe. When the particle concentration reaches a preset threshold, the pneumatic butterfly valve automatically opens to discharge slag.

8. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 6, characterized in that: The baffles inside the settling pipe are arranged at a staggered 45° angle, with the distance between adjacent baffles being 1.2-1.5 times the pipe diameter, and the height of the baffles being 1 / 3-1 / 2 of the pipe's inner diameter.

9. A magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to any one of claims 1 to 8, characterized in that: The servo motor and the electronically controlled magnetic force generator are linked and controlled by a controller. When the servo motor drives the electromagnetic rod to move to the outside of the circular tube, the electronically controlled magnetic force generator automatically cuts off the magnetism of the electromagnetic rod.

10. The magnetic particle removal device for feeding a vinylidene fluoride monomer storage tank according to claim 1, characterized in that: The inner wall of the polymer membrane separation tube is coated with a polyvinylidene fluoride composite coating with an average pore size of 0.1-0.5 μm, and the outer wall of the polymer membrane separation tube is provided with an ultrasonic vibrator with a vibration frequency of 20-40 kHz.

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