A magnetic removal filter device

Abstract

The application relates to a demagnetization filtering device which comprises a shell and a plurality of demagnetization filtering structures arranged along the height direction of the shell; the filtering precision of the plurality of demagnetization filtering structures gradually increases along the height direction of the shell; the demagnetization filtering structure comprises a first semicircular ring filter screen, a second semicircular ring filter screen and a plurality of magnetic blocks; the plurality of magnetic blocks are fixedly arranged at the bottom of the first semicircular ring filter screen and the bottom of the second semicircular ring filter screen respectively, and the gap between adjacent magnetic blocks is not less than the mesh number of the first semicircular ring filter screen or the mesh number of the second semicircular ring filter screen. The demagnetization filtering device is characterized in that the shell is integrated with multiple demagnetization filtering structures, the area occupied by the device is small, extra pump sets and pipelines are saved, and the investment and operation cost are reduced correspondingly.

Description

Technical Field

[0001] This utility model relates to physical separation devices, and more particularly to a demagnetizing filter device. Background Technology

[0002] The cleanliness of lithium-ion battery slurry directly determines the battery's safety, cycle life, and yield. During the slurry mixing process, magnetic foreign matter such as iron filings and stainless steel powder is often mixed into the slurry. If this is carried into subsequent coating and rolling processes, it can easily cause electrode perforation, micro-short circuits, or even thermal runaway.

[0003] Traditional demagnetizing devices typically employ multiple circular permanent magnets arranged in a ring inside the tank wall. This results in low magnetic field coverage, with the central area becoming an escape channel. Multiple units need to be connected in series to reduce the magnetic particle content to the required level. This leads to large equipment footprint and high energy consumption. Uneven spacing between the magnetic rods and the tank wall results in uneven slurry flow velocity distribution, with longer residence time at the edges and faster scouring at the center, leading to gradient differences in demagnetizing efficiency. The magnetic rods are fixed by threaded stainless steel sleeves, requiring specialized wrenches for disassembly and assembly. The sleeves demagnetize or become magnetically shielded under long-term scouring by the electrolyte, resulting in short maintenance cycles. Cleaning requires individual removal and wiping of each rod, leading to frequent downtime and difficulty in matching continuous production cycles. Separating filtration and demagnetization functions necessitates the use of separate vibrating screens or bag filters for large particles, resulting in a lengthy process and a high rate of missed detections. While multi-chamber series designs can improve purification efficiency, they increase equipment height and raise the center of gravity, placing additional demands on plant height and steel structure. Each additional chamber requires an additional set of valves, instruments, and piping, significantly increasing investment and maintenance costs.

[0004] There is an urgent need for a compact, quick-maintaining demagnetizing filtration device that combines staged filtration and efficient demagnetization to improve slurry cleanliness and reduce manufacturing costs. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art, and therefore adopts the following technical solution: A demagnetizing filter device is provided, comprising: a housing, and a plurality of demagnetizing filter structures disposed along the height direction of the housing; wherein... The filtration accuracy of the demagnetizing filter structure gradually increases as the height of the housing decreases; the demagnetizing filter structure includes: a first semi-circular filter screen, a second semi-circular filter screen, and a plurality of magnetic blocks; The first semi-circular filter screen and the second semi-circular filter screen are arranged opposite to each other. The outer edge of the first semi-circular filter screen is detachably connected to the housing, the outer edge of the second semi-circular filter screen is detachably connected to the housing, and the end of the first semi-circular filter screen is detachably connected to the end of the second semi-circular filter screen. The magnetic blocks are respectively fixedly disposed at the bottom of the first semi-circular filter screen and the bottom of the second semi-circular filter screen, and the gap between adjacent magnetic blocks is not less than the mesh count of the first semi-circular filter screen or the mesh count of the second semi-circular filter screen.

[0006] Preferably, the top of the housing has a feed inlet, and the bottom of the housing has a first discharge outlet and a second discharge outlet.

[0007] Preferably, valves are provided on the feed inlet, the first discharge outlet, and the second discharge outlet.

[0008] Preferably, a plurality of the demagnetizing filter structures are uniformly arranged along the height direction of the housing.

[0009] Preferably, the number of the demagnetizing filter structures is four.

[0010] Preferably, a plurality of fixing holes are provided on the side wall of the housing, and a plurality of connecting blocks are fixedly provided on the outer side wall of the housing. The positions of the plurality of connecting blocks correspond to the positions of the plurality of fixing holes, and the positions of the plurality of fixing holes correspond to the positions of the plurality of demagnetizing filter structures. The outer edge of the first semi-circular filter screen extends outward to form a first connecting part. After passing through one of the fixing holes, the first connecting part is detachably connected to the corresponding connecting block by bolts and nuts. A sealing ring is provided between the first connecting part and the fixing hole. The outer edge of the second semi-circular filter screen extends outward to form a second connecting part. After passing through another fixing hole at the same height, the second connecting part is detachably connected to the corresponding connecting block by bolts and nuts. A sealing ring is provided between the second connecting part and the fixing hole.

[0011] Preferably, the end of the first semi-circular filter screen and the end of the second semi-circular filter screen are detachably connected by bolts and nuts.

[0012] Preferably, a plurality of the magnetic blocks are arranged in parallel at the bottom of the first semi-circular filter screen and the bottom of the second semi-circular filter screen.

[0013] Preferably, it further includes: a rotating shaft, a plurality of scrapers arranged along the axial direction of the rotating shaft, and a motor for driving the rotating shaft to rotate; wherein, The rotating shaft is rotatably disposed within the annular area formed by the inner edge of the first semi-circular filter and the inner edge of the second semi-circular filter along the height direction of the housing.

[0014] Preferably, each of the demagnetizing filter structures has at least one scraper on its upper surface.

[0015] Compared with the prior art, the beneficial effects of this utility model are reflected in: The demagnetizing filter device of this utility model integrates a multi-stage demagnetizing filter structure in the shell, which occupies a small area, eliminates the need for additional pump sets and pipelines, and reduces investment and operating costs accordingly. The mesh count of the first semi-circular filter screen or the second semi-circular filter screen and the number of magnetic blocks can be increased or decreased as needed. With the online scraping of the scraper set on the upper surface of the demagnetizing filter structure, the pressure difference remains stable, the slurry solid content and viscosity fluctuate little, the consistency of subsequent coating thickness is improved, the self-discharge rate of the battery cell is reduced, and the overall line qualification rate is improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the demagnetizing filter device in this utility model; The reference numerals in the figures include: 1. Housing; 12. First discharge port; 13. Second discharge port; 14. Connecting block; 2. Demagnetizing filter structure; 21. First semi-circular filter screen; 211. Second semi-circular filter screen; 22. Second connecting part; 221. Magnetic block; 23. Rotating shaft; 3. Scraper; 4. Motor; 5. Detailed Implementation

[0017] The specific embodiments of this utility model will be described in detail below.

[0018] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0019] The word "comprising" or similar terms used in this utility model patent application specification and claims mean that the objects preceding "comprising" include the objects listed after "comprising" or their equivalents, and do not exclude other objects.

[0020] Example 1 like Figure 1 As shown, this embodiment provides a demagnetizing filter device, including: a housing 1, a plurality of demagnetizing filter structures 2 uniformly arranged along the height direction of the housing 1, a rotating shaft 3, a plurality of scrapers 4 arranged along the axial direction of the rotating shaft 3, and a motor 5 for driving the rotating shaft 3 to rotate; wherein, The housing 1 includes: a housing body and a housing top cover that is detachably connected to the housing body; The shell body has a feed inlet at the top and a first discharge port 12 and a second discharge port 13 at the bottom. Valves are provided on the feed inlet, the first discharge port 12, and the second discharge port 13. The side wall of the shell body has a plurality of fixing holes, and a plurality of connecting blocks 14 are fixedly provided on the outer side wall of the shell body. The positions of the plurality of connecting blocks 14 correspond to the positions of the plurality of fixing holes, and the positions of the plurality of fixing holes correspond to the positions of the plurality of demagnetizing filter structures 2. The filtration precision of the demagnetizing filter structure 2 (i.e., the mesh count of the first semi-circular filter screen 21 and the mesh count of the second semi-circular filter screen 22, described later) gradually increases as the height of the housing 1 decreases, forming a continuous field of "coarse first, fine later, filtering and demagnetizing simultaneously" within the housing 1; the demagnetizing filter structure 2 includes: a first semi-circular filter screen 21, a second semi-circular filter screen 22, and a plurality of magnetic blocks 23; The first semi-circular filter screen 21 and the second semi-circular filter screen 22 are arranged opposite to each other. The outer edge of the first semi-circular filter screen 21 extends outward to form a first connecting part 211. The first connecting part 211 passes through one of the fixing holes and is detachably connected to the corresponding connecting block 14 by bolts and nuts. A sealing ring (preferably a corrosion-resistant sealing ring) is provided between the first connecting part 211 and the fixing hole to reduce the risk of leakage. The outer edge of the second semi-circular filter screen 22 extends outward to form a second connecting part 221. The second connecting part 221 passes through another connecting block 14 at the same height. After the fixing hole is reached, it is detachably connected to the corresponding connecting block 14 by bolts and nuts. A sealing ring (preferably a corrosion-resistant sealing ring) is provided between the second connecting part 221 and the fixing hole to reduce the risk of leakage. The end of the first semi-circular ring filter screen 21 and the end of the second semi-circular ring filter screen 22 are detachably connected by bolts and nuts. The first semi-circular ring filter screen 21 and the second semi-circular ring filter screen 22 can be pulled out in the axial direction after the bolts are removed. The magnetic block 23 can be cleaned and replaced as a whole with the first semi-circular ring filter screen 21 or the second semi-circular ring filter screen 22, which shortens the maintenance time and does not require special tools. In this configuration, several magnetic blocks 23 are respectively fixedly arranged in parallel at the bottom of the first semi-circular filter screen 21 and the bottom of the second semi-circular filter screen 22, and the gap between adjacent magnetic blocks 23 is not less than the mesh size of the first semi-circular filter screen 21 or the mesh size of the second semi-circular filter screen 22. The magnetic blocks 23 are evenly spaced from the slurry, and the magnetic field is evenly distributed. Once magnetic impurities pass through the first semi-circular filter screen 21 or the second semi-circular filter screen 22, they are adsorbed by the magnetic blocks 23. The capture path is short and the probability is high. The content of magnetic foreign matter can be reduced to an extremely low level without the need for multiple devices to be connected in series. The rotating shaft 3 is rotatably disposed in the annular area formed by the inner edge of the first semi-circular filter screen 21 and the inner edge of the second semi-circular filter screen 22 along the height direction of the housing 1. The motor 5 is fixedly installed in the top cover of the housing, and the output end of the motor 5 is fixedly connected to the top of the rotating shaft 3; the bottom of the rotating shaft 3 is fixedly connected to the inner side of a bearing, and the outer side of the bearing is fixedly connected to the inner side wall of the housing body through spokes. Each of the above-mentioned demagnetizing filter structures 2 is provided with at least one of the above-mentioned scrapers 4. The scrapers 4 provided on the upper surface of each of the above-mentioned demagnetizing filter structures 2 are used to scrape the demagnetizing filter structure 2 in real time, and the remaining scrapers 4 are used to break up the agglomerated particles in real time, so as to avoid clogging of the first semi-circular filter screen 21 or the second semi-circular filter screen 22 and realize uninterrupted operation. In a preferred embodiment, the number of the demagnetizing filter structures 2 is four.

[0021] In use, first assemble the bottom of the rotating shaft 3 with the bottom of the housing 1, then install the demagnetizing filter structure 2 and the scraper 4 in sequence, and fix each layer with bolts immediately after it is in place; after all the demagnetizing filter structures 2 and scrapers 4 are assembled, assemble the top of the rotating shaft 3 with the output end of the motor 5, and at the same time assemble the top cover of the housing with the main body of the housing. The slurry enters the shell 1 through the feed inlet. After the scraper 4 breaks up the agglomerated particles, it passes through several demagnetizing filter structures 2 to complete the staged filtration and demagnetization. It is then discharged through the first discharge outlet 12, and the impurities are discharged through the second discharge outlet 13. During maintenance, simply reverse the assembly steps described above to disassemble, clean, and replace the parts.

[0022] In summary, the demagnetizing filter device of this utility model integrates a multi-stage demagnetizing filter structure in the shell, which occupies a small area, eliminates the need for additional pump sets and pipelines, and correspondingly reduces investment and operating costs. The mesh count of the first semi-circular filter screen or the second semi-circular filter screen and the number of magnetic blocks can be increased or decreased as needed. With the online scraping of the scraper set on the upper surface of the demagnetizing filter structure, the pressure difference remains stable, the slurry solid content and viscosity fluctuate little, the consistency of subsequent coating thickness is improved, the self-discharge rate of the battery cell is reduced, and the overall line qualification rate is improved.

[0023] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A demagnetizing filter device, characterized in that, include: The housing (1) and a plurality of demagnetizing filter structures (2) arranged along the height direction of the housing (1); wherein, The filtration accuracy of several of the demagnetizing filter structures (2) gradually increases as the height of the housing (1) decreases; the demagnetizing filter structure (2) includes: a first semi-circular filter screen (21), a second semi-circular filter screen (22), and several magnetic blocks (23). The first semi-circular filter (21) and the second semi-circular filter (22) are arranged opposite to each other. The outer edge of the first semi-circular filter (21) is detachably connected to the housing (1), the outer edge of the second semi-circular filter (22) is detachably connected to the housing (1), and the end of the first semi-circular filter (21) is detachably connected to the end of the second semi-circular filter (22). Among them, a plurality of magnetic blocks (23) are fixedly disposed at the bottom of the first semi-circular filter screen (21) and the bottom of the second semi-circular filter screen (22), and the gap between adjacent magnetic blocks (23) is not less than the mesh count of the first semi-circular filter screen (21) or the mesh count of the second semi-circular filter screen (22).

2. The demagnetizing filter device according to claim 1, characterized in that, The top of the housing (1) is provided with a feed inlet, and the bottom of the housing (1) is provided with a first discharge port (12) and a second discharge port (13).

3. The demagnetizing filter device according to claim 2, characterized in that, Valves are provided on the feed inlet, the first discharge outlet (12), and the second discharge outlet (13).

4. The demagnetizing filter device according to claim 1, characterized in that, Several of the demagnetizing filter structures (2) are uniformly arranged along the height direction of the housing (1).

5. The demagnetizing filter according to claim 1 or 4, characterized in that, The number of the demagnetizing filter structure (2) is 4.

6. The demagnetizing filter device according to claim 1, characterized in that, The side wall of the housing (1) is provided with a plurality of fixing holes, and a plurality of connecting blocks (14) are fixedly provided on the outer side wall of the housing (1). The positions of the plurality of connecting blocks (14) correspond to the positions of the plurality of fixing holes, and the positions of the plurality of fixing holes correspond to the positions of the plurality of demagnetizing filter structures (2). The outer edge of the first semi-circular filter screen (21) extends outward to form a first connecting part (211). The first connecting part (211) passes through one of the fixing holes and is detachably connected to the corresponding connecting block (14) by bolts and nuts. A sealing ring is provided between the first connecting part (211) and the fixing hole. The outer edge of the second semi-circular filter screen (22) extends outward to form a second connecting part (221). The second connecting part (221) passes through another fixing hole at the same height and is detachably connected to the corresponding connecting block (14) by bolts and nuts. A sealing ring is provided between the second connecting part (221) and the fixing hole.

7. The demagnetizing filter device according to claim 1, characterized in that, The end of the first semi-circular filter screen (21) is detachably connected to the end of the second semi-circular filter screen (22) by bolts and nuts.

8. The demagnetizing filter device according to claim 1, characterized in that, Several of the magnetic blocks (23) are arranged in parallel at the bottom of the first semi-circular filter screen (21) and the bottom of the second semi-circular filter screen (22).

9. The demagnetizing filter device according to claim 1, characterized in that, Also includes: A rotating shaft (3), a plurality of scrapers (4) arranged along the axial direction of the rotating shaft (3), and a motor (5) for driving the rotating shaft (3) to rotate; wherein, The rotating shaft (3) is rotatably disposed in the annular area formed by the inner edge of the first semi-circular filter screen (21) and the inner edge of the second semi-circular filter screen (22) along the height direction of the housing (1).

10. The demagnetizing filter according to claim 9, characterized in that, Each of the demagnetizing filter structures (2) has at least one scraper (4) on its upper surface.

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