A bag-type dust collector for lithium battery material production

Abstract

The application provides a bag type dust collector for lithium battery material production and belongs to the technical field of dust removal and environmental protection equipment, which comprises an extension box and a filter box, a supporting plate is arranged between the extension box and the filter box, the supporting plate is connected with a filter assembly, and the filter assembly is used for improving the dust removal effect of the equipment. The application has the beneficial effects that the water, oil or oil mist in the compressed gas is separated from the main airflow by the separation mechanism, so that the compressed gas containing water and oil directly enters the inside of the filter bag is reduced, the risk of the lithium battery material dust being caked, adhered and pasted is reduced, the blowback airflow is changed from fixed direction blowing to circumferential sweeping by the separation mechanism, meanwhile, the elastic strips are expanded and flexibly hit the protective frame or drive the filter bag to vibrate under the centrifugal action, so that the airflow blowback and mechanical micro-vibration are synchronized for dust removal, the peeling effect of the dust layer on the surface of the filter bag is improved, and the local dust residue and caking are reduced.

Description

Technical Field

[0001] This invention relates to the field of dust removal and environmental protection equipment technology, and more specifically, to a bag filter for lithium battery material production. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage industries, the production and recycling scale of lithium batteries is constantly expanding. During the production of lithium battery materials, dismantling, crushing, screening, and powder conveying of waste lithium batteries, a large amount of fine dust containing positive electrode materials, negative electrode materials, lithium salts, conductive agents, and metal powders is generated. This type of dust not only has a small particle size and is easily dispersed by airflow, but some dust also contains components such as nickel, cobalt, manganese, and lithium. If it is not collected and treated in a timely manner, it can easily cause environmental pollution, material loss, and the risk of personnel inhalation. Therefore, it is usually necessary to use a negative pressure collection system in conjunction with a bag filter to filter and recover the dust.

[0003] Baghouse dust collectors typically use filter bags to filter dust-laden gas, trapping dust on the filter bag surface. The purified gas is then discharged through the exhaust port. When a certain thickness of dust layer accumulates on the filter bag surface, compressed air is used to backflush the filter bags, causing the dust adhering to the filter bag surface to fall off and enter the dust collection bin, thereby restoring the filter bag's air permeability. However, in lithium battery material production or recycling operations, ordinary baghouse dust collectors still have certain shortcomings, especially since the compressed air used for backflush often carries moisture and oil. If such gas directly enters the filter bag and acts on the dust layer on the filter bag surface, it can easily cause cathode material dust and lithium salt powder to become trapped inside the filter bag. Powders with high dust or residual alkali content tend to absorb moisture, adhere, and clump. This is especially true for high-nickel cathode materials, lithium-containing powders, or black powders recovered from waste lithium batteries. The lithium-containing alkaline substances remaining on their surfaces easily form sticky residues after contacting moisture and carbon dioxide, causing dust to gradually clump on the filter bag surface. This leads to decreased filter bag permeability, increased equipment operating pressure differential, and poor backflushing cleaning effect. In severe cases, it can even cause bag clogging. At the same time, if oil mist in compressed air enters the filter bag or the recovered dust, it can also easily cause oily adhesion to the dust layer, affecting the filter bag cleaning effect and reducing the cleanliness and reuse value of the recovered powder.

[0004] Existing baghouse dust collectors typically clean dust from the filter bag surface using a conventional pulse-jet backflushing method. However, when moisture and oil in the compressed gas are not effectively removed, the backflushing gas, while impacting the filter bag, may also introduce water and oil mist into the dust layer on the filter bag surface, exacerbating dust absorption, agglomeration, and adhesion. When the dust layer on the filter bag surface has already hardened, simply relying on a fixed-direction backflushing airflow is insufficient to remove the dust completely, resulting in poor long-term operational stability of the dust collector. How to invent a baghouse dust collector for lithium battery material production to solve these problems has become an urgent issue for those skilled in the art. Summary of the Invention

[0005] To overcome the above deficiencies, this invention provides a bag filter for lithium battery material production, which aims to solve the problem that if the gas directly enters the interior of the filter bag and acts on the dust layer on the surface of the filter bag during backflushing, the positive electrode material dust, lithium salt dust, or powder with high residual alkali content will easily absorb moisture, adhere, and clump.

[0006] This invention is implemented as follows:

[0007] This invention provides a bag filter for lithium battery material production, including an extension box and a filter box. A support plate is provided between the extension box and the filter box, and a filter assembly is connected to the support plate. The filter assembly is used to improve the dust removal effect of the equipment.

[0008] Preferably, a fixing frame is fixedly connected to the outer wall of the filter box, a dust collection bin is fixedly connected to one end of the filter box, and the other end of the filter box is fixedly connected to the extension box and the support plate respectively by bolts. The side wall of the support plate is provided with an mounting plate.

[0009] Preferably, the extension box has an internal air distribution pipe, an exhaust pipe on the side wall of the extension box, an air pump on the outer wall of the extension box, an air pump connected to a solenoid valve, and one end of the air distribution pipe passes through the extension box and is fixedly connected to the solenoid valve.

[0010] Preferably, the filter assembly includes a mounting base, one end of which is fixedly connected to a protective frame, the outer wall of which is fitted with a filter bag, the mounting base being snapped and fixed to a support plate, one end of which is fixedly connected to a base, and the side wall of which is rotatably connected to a rotating seat.

[0011] Preferably, the filter assembly further includes a separation mechanism, which includes an air inlet pipe and an outer cylinder. One end of the outer cylinder is fixedly connected to the outer wall of the air distribution pipe, and both ends of the air inlet pipe are fixedly connected to the outer walls of the outer cylinder and the air distribution pipe, respectively. A guide cone and a separator are fixedly connected inside the outer cylinder, and the guide cone is located inside the separator.

[0012] Preferably, a spiral plate is fixedly connected to the inner wall of the outer cylinder, and a plurality of cohesive ribs are provided on the inner wall of the outer cylinder, and a baffle is fixedly connected to the side wall of the spiral plate.

[0013] Preferably, the outer cylinder is detachably connected to a mounting base at the end away from the gas distribution pipe, and a connector is fixedly connected to one end of the mounting base. An adsorption core is provided inside the mounting base. An inner cylinder is fixedly connected to one end of the outer cylinder. The inner cylinder is located between the guide cone and the separator cylinder, and the end of the inner cylinder near the guide cone is flared.

[0014] Preferably, the side wall of the mounting base is provided with a liquid collection groove, the inner wall of the liquid collection groove is provided with a plurality of circumferentially arrayed permeation grooves, the inner wall of the permeation groove is provided with a discharge groove hole, the discharge groove hole is arranged in an "S" shape, and one side of the discharge groove hole is in contact with the adsorption core.

[0015] Preferably, the filter assembly further includes a disengagement mechanism, which includes a vertical cylinder. One end of the vertical cylinder is rotatably connected to a connector, and the other end of the vertical cylinder is fixedly connected to the inner wall of a rotating seat. A pressure sensor is fixedly connected to the inner wall of the rotating seat.

[0016] Preferably, the interior of the vertical cylinder is provided with a piston column and a return spring. The piston column is T-shaped. The two ends of the return spring are fixedly connected to the inner wall of the rotating seat and the side wall of the piston column, respectively. The outer wall of the vertical cylinder is fixedly connected with a plurality of spirally distributed air blowing pipes. The air blowing pipes are L-shaped and one end of the air blowing pipe is provided with an elastic strip.

[0017] The beneficial effects of this invention are:

[0018] 1. This invention employs a separation mechanism consisting of an inlet pipe, an outer cylinder, a spiral plate, a baffle, cohesive ribs, a separator cylinder, an inner cylinder, and a guide cone. This mechanism enables the compressed backflushing gas to rotate along the inner wall of the outer cylinder after entering it. By utilizing centrifugal force, wall collision force, and droplet coagulation effect of the cohesive ribs, moisture, oil, or oil mist in the compressed gas are separated from the main airflow. This reduces the direct entry of water- or oil-containing compressed gas into the filter bag, thereby lowering the risk of lithium battery material dust agglomerating, adhering, and clogging due to moisture and oil absorption.

[0019] 2. This invention employs a separation mechanism consisting of a vertical cylinder, a rotating seat, spirally distributed L-shaped air blowing pipes, and elastic strips. This mechanism allows compressed gas, after water and oil removal, to be ejected circumferentially from multiple air blowing pipes during backflushing of the filter bag. The reaction force generated by the ejected gas drives the vertical cylinder to rotate, changing the backflushing airflow from fixed-direction blowing to circumferential sweeping. Simultaneously, the elastic strips unfold under centrifugal force and flexibly beat the protective frame or cause the filter bag to vibrate, thereby achieving synchronous dust removal through airflow backflushing and mechanical micro-vibration. This improves the removal effect of the dust layer on the filter bag surface and reduces local dust residue and caking. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the dust collection bin structure of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the filter box structure of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the air pump and filter assembly structure of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the air distribution pipe and filter bag structure of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the protective frame structure of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0027] Figure 7 This invention provides a bag filter for lithium battery material production. Figure 6 Enlarged schematic diagram of the structure at point A in the middle;

[0028] Figure 8 This is a schematic diagram of a half-section structure of the filter assembly of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the internal structure of a vertical cylinder of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0030] Figure 10 This is a partial structural cross-sectional view of the mounting base of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0031] Figure 11 This is a top-section structural diagram of the mounting base of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the internal structure of the outer cylinder of a bag filter for lithium battery material production provided by an embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of the working state structure of the elastic strip of a bag filter for lithium battery material production provided by an embodiment of the present invention.

[0034] In the diagram: 1. Exhaust pipe; 2. Extension box; 3. Air pump; 31. Solenoid valve; 4. Filter box; 5. Dust collection bin; 6. Fixing frame; 7. Mounting plate; 8. Air distribution pipe; 9. Filter assembly; 91. Filter bag; 92. Card holder; 93. Separation mechanism; 931. Inlet pipe; 932. Guide cone; 933. Outer cylinder; 934. Condensing ribs; 935. Spiral plate; 9351. Baffle; 936. Separating cylinder; 93 7. Inner cylinder; 938. Mounting base; 9381. Liquid collection tank; 9382. Permeation tank; 9383. Discharge slot; 939. Adsorption core; 94. Protective frame; 95. Detachment mechanism; 951. Elastic strip; 952. Air blowing pipe; 953. Vertical cylinder; 954. Piston column; 955. Return spring; 956. Pressure sensor; 96. Base; 961. Rotating seat; 97. Connector; 10. Support plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1

[0037] Reference Figures 1-13 A bag filter for lithium battery material production includes an extension box 2 and a filter box 4. A support plate 10 is provided between the extension box 2 and the filter box 4. A filter assembly 9 is connected to the support plate 10. The filter assembly 9 is used to improve the dust removal effect of the equipment.

[0038] Furthermore; a fixing frame 6 is fixedly connected to the outer wall of the filter box 4, a dust collection chamber 5 is fixedly connected to one end of the filter box 4, and the other end of the filter box 4 is fixedly connected to the extension box 2 and the support plate 10 respectively by bolts. The side wall of the support plate 10 is provided with an installation plate 7; the interior of the extension box 2 is provided with an air distribution pipe 8, the side wall of the extension box 2 is provided with an exhaust pipe 1, the outer wall of the extension box 2 is provided with an air pump 3, the air pump 3 is connected to a solenoid valve 31, one end of the air distribution pipe 8 passes through the extension box 2 and is fixedly connected to the solenoid valve 31; the filter assembly 9 includes a card holder 92, a protective frame 94 is fixedly connected to one end of the card holder 92, a filter bag 91 is fitted on the outer wall of the protective frame 94, the card holder 92 is snapped and fixed to the support plate 10, a base 96 is fixedly connected to one end of the protective frame 94, and a rotating seat 961 is rotatably connected to the side wall of the base 96.

[0039] It should be noted that:

[0040] After the gas enters through the inlet of the dust collection chamber 5, it first diffuses and slows down in the lower space of the dust collection chamber 5 and the filter box 4. The larger and heavier lithium battery material dust particles in the airflow preferentially settle into the dust collection chamber 5 under the action of gravity. The smaller dust particles suspended with the airflow continue to move towards the area where the filter bag 91 is located with the negative pressure airflow. The filter bag 91 is fitted on the outside of the protective frame 94. The protective frame 94 plays a supporting and shaping role for the filter bag 91, so that the filter bag 91 is not prone to collapse, twisting or excessive swinging during negative pressure adsorption and subsequent backflushing. When the dust-laden gas passes through the filter bag 91, the lithium battery material dust is trapped on the outer surface of the filter bag 91, while the clean gas passes through the filter bag 91 and enters the inside of the filter bag 91. It then enters the extension box 2 through the ventilation gap formed between the card seat 92 and the outer cylinder 933, and finally is discharged through the exhaust pipe 1.

[0041] As the filtration time increases, a dust layer gradually forms on the outer surface of the filter bag 91. This dust layer can further intercept fine cathode material dust, lithium salt dust, or black powder particles, improving filtration accuracy. At the same time, the cooperation between the support plate 10 and the card holder 92 can separate the dust-laden side and the clean side, reducing the possibility of unfiltered gas directly entering the extension box 2. The dust intercepted by the filter bag 91 or cleared by backflushing eventually flows downward into the dust collection chamber 5 for centralized collection, thereby realizing the filtration, settling, and centralized recovery of dust during the lithium battery material production process. The installation method of the card holder 92 and the filter bag 91 is existing technology.

[0042] Reference Figures 4-12 Furthermore, the filter assembly 9 also includes a separation mechanism 93, which includes an inlet pipe 931 and an outer cylinder 933. One end of the outer cylinder 933 is fixedly connected to the outer wall of the air distribution pipe 8, and both ends of the inlet pipe 931 are fixedly connected to the outer cylinder 933 and the outer wall of the air distribution pipe 8, respectively. A guide cone 932 and a separator cylinder 936 are fixedly connected inside the outer cylinder 933, with the guide cone 932 located inside the separator cylinder 936. A spiral plate 935 is fixedly connected to the inner wall of the outer cylinder 933. The wall is provided with several cohesive ribs 934, and the side wall of the spiral plate 935 is fixedly connected with a baffle 9351; the end of the outer cylinder 933 away from the gas distribution pipe 8 is detachably connected to a mounting base 938, one end of the mounting base 938 is fixedly connected to a connector 97, the inside of the mounting base 938 is provided with an adsorption core 939, one end of the outer cylinder 933 is fixedly connected to an inner cylinder 937, the inner cylinder 937 is located between the guide cone 932 and the separator cylinder 936, and the end of the inner cylinder 937 near the guide cone 932 is flared.

[0043] It should be noted that:

[0044] After the filter bag 91 has been used for a period of time, the dust layer on the outer surface of the filter bag 91 gradually thickens, and the operating resistance of the equipment increases. At this time, the air pump 3 is started and the solenoid valve 31 is opened to allow compressed gas to enter the gas distribution pipe 8, and then the gas distribution pipe 8 distributes it to the corresponding air inlet pipe 931. After the compressed gas enters the outer cylinder 933 through the air inlet pipe 931, it flows spirally along the inner wall of the outer cylinder 933 under the guidance of the spiral plate 935 on the inner wall of the outer cylinder 933. The baffle 9351 is used to restrict the gas from directly entering the central area, so that the compressed gas maintains a certain swirling path and residence time in the outer cylinder 933. Since the density of water droplets, oil droplets and oil mist particles is greater than that of the gas itself, After the swirling airflow forms a centrifugal force inside the outer cylinder 933, the moisture and oil in the gas are thrown towards the inner wall of the outer cylinder 933 and the surface of the spiral plate 935. Several condensing ribs 934 set on the inner wall of the outer cylinder 933 are located in the outer scouring area of ​​the swirling gas, which can increase the collision opportunities between oil mist, water mist and the wall surface, so that the fine droplets are intercepted, collided and merged on the surface of the condensing ribs 934, and gradually the tiny droplets are gathered into larger droplets or continuous liquid film. Under the thrust of the airflow, gravity and the guiding action of the spiral plate 935, the liquid film moves along the inner wall of the outer cylinder 933 towards the mounting base 938, and finally flows into the liquid collection tank 9381 on the side wall of the mounting base 938.

[0045] Meanwhile, the gas, after preliminary dehydration and oil removal, forms a relatively clean flow path between the separator 936 and the inner cylinder 937. The end of the inner cylinder 937 near the guide cone 932 is flared, which can reduce the local resistance and eddy current loss when the gas enters the inner cylinder 937. The guide cone 932 is used to converge and guide the airflow, so that the treated compressed gas can quickly enter the interior of the inner cylinder 937 and continue to be transported to the subsequent backflushing structure. Through the above structure, the compressed gas can complete the swirling separation of moisture and oil and the wall condensation before entering the backflushing area of ​​the filter bag 91. This reduces the risk of lithium battery dust absorbing moisture and agglomerating due to direct impact of water- and oil-containing compressed gas on the filter bag 91, and avoids the use of high-resistance filter elements which would significantly weaken the pulse backflushing effect.

[0046] Furthermore, the side wall of the mounting base 938 is provided with a liquid collection tank 9381, the inner wall of the liquid collection tank 9381 is provided with a number of circumferentially arrayed permeation tanks 9382, the inner wall of the permeation tank 9382 is provided with a discharge slot hole 9383, the discharge slot hole 9383 is arranged in an "S" shape, and one side of the discharge slot hole 9383 is in contact with the adsorption core 939.

[0047] It should be noted that:

[0048] The liquid guided from the inner wall of the outer cylinder 933 and the spiral plate 935 to the mounting base 938 first enters the collection tank 9381. The collection tank 9381 is arranged circumferentially along the mounting base 938, which can collect oil and water liquids flowing down from different positions in a circumferential manner, avoiding the liquid from staying in the main airflow channel of the outer cylinder 933. After collection, the liquid enters the circumferentially arrayed permeation tanks 9382 under the action of gravity and guidance, and then enters the discharge slots 9383 from the permeation tanks 9382. The discharge slots 9383 are S-shaped, so that the liquid flow path forms a tortuous labyrinth channel. On the one hand, it can extend the contact path between the liquid and the inner wall of the channel, and on the other hand, it can facilitate the liquid to move stably towards the adsorption core 939 under the action of surface tension. Migration; on the other hand, it can weaken the direct reverse impact of pulse gas on liquid, preventing liquid that has entered the discharge slot 9383 from being carried back to the collection tank 9381 or the outer cylinder 933 under the action of instantaneous high-pressure airflow. The adsorption core 939 is in contact with one side of the discharge slot 9383. When the liquid reaches the end of the discharge slot 9383, the adsorption core 939 can absorb, lock and temporarily store water and oil, so that the separated liquid is transferred out from the main jet airflow path. Through the continuous cooperation of the collection tank 9381, the permeation tank 9382, the S-shaped discharge slot 9383 and the adsorption core 939, the separation mechanism 93 can ensure the continuous effect of water and oil removal of compressed gas.

[0049] The adsorption core 939 is preferably made of a porous adsorption material with water and oil absorption capacity and is not easy to shed, such as polypropylene oil-absorbing cotton, polyester fiber felt, polyurethane sponge or glass fiber adsorption cotton. The adsorption core 939 is set inside the mounting base 938 and is in contact with the discharge slot 9383. It is used to absorb water, oil or oil-water mixture introduced by the liquid collection tank 9381 and the permeation tank 9382. By temporarily storing and locking the separated liquid through the adsorption core 939, it can prevent the liquid from being re-entrained into the inner tank 937 by the subsequent high-pressure gas after long-term retention in the outer cylinder 933. This reduces the residual water and oil in the backflushing gas and reduces the risk of dust moisture absorption and agglomeration and oil adhesion on the surface of the filter bag 91.

[0050] Example 2

[0051] Reference Figure 6 , Figure 9 and Figure 13Furthermore, the filter assembly 9 also includes a disengagement mechanism 95, which includes a vertical cylinder 953. One end of the vertical cylinder 953 is rotatably connected to the connector 97, and the other end of the vertical cylinder 953 is fixedly connected to the inner wall of the rotating seat 961. A pressure sensor 956 is fixedly connected to the inner wall of the rotating seat 961. Inside the vertical cylinder 953, there is a piston column 954 and a return spring 955. The piston column 954 is arranged in a "T" shape. The two ends of the return spring 955 are fixedly connected to the inner wall of the rotating seat 961 and the side wall of the piston column 954, respectively. Several spirally distributed air blowing pipes 952 are fixedly connected to the outer wall of the vertical cylinder 953. The air blowing pipes 952 are arranged in an "L" shape, and one end of the air blowing pipe 952 is provided with an elastic strip 951.

[0052] It should be noted that:

[0053] After being dewatered and degreased by the separation mechanism 93, the compressed gas enters the vertical cylinder 953 through the connector 97. Since the inner diameter of the vertical cylinder 953 is smaller than that of the inner cylinder 937, the gas velocity increases upon entering the vertical cylinder 953, creating a certain injection pressure. Subsequently, it is ejected through multiple spirally distributed L-shaped air-blowing pipes 952 towards the inside of the filter bag 91 or its circumferential area. Each air-blowing pipe 952 is offset and spirally arranged relative to the axis of the vertical cylinder 953. When the gas exits through the air-blowing pipes 952, it not only creates a radial back-blowing airflow on the filter bag 91 but also generates a circumferential reaction force on the vertical cylinder 953, causing it to rotate relative to the connector 97. This rotation of the vertical cylinder 953 drives the air-blowing pipes 952 on its outer side to rotate synchronously, transforming the fixed-direction single-point back-blowing into a circumferential sweeping airflow. This allows the back-blowing airflow to act sequentially on different positions inside the filter bag 91 or its circumferential area, reducing the pressure on the filter bag 91. The wear caused by long-term impact of strong airflow in localized areas is reduced, while the uniformity of dust layer peeling around the filter bag 91 is improved. The elastic strip 951 is set at one end of the air blowing pipe 952. Under normal conditions, it hangs down due to its own weight. When compressed gas is sprayed out from the air blowing pipe 952 and drives the vertical cylinder 953 to rotate, the elastic strip 951 is gradually straightened and unfolded outward by the airflow thrust and centrifugal force. During the rotation of the vertical cylinder 953, the unfolded elastic strip 951 can intermittently contact or strike the protective frame 94, causing the protective frame 94 to vibrate slightly. The vibration is then transmitted to the outer filter bag 91, causing the dust layer attached to the surface of the filter bag 91 to crack, loosen and fall off. This process makes the back-blowing airflow cleaning and mechanical micro-vibration cleaning occur simultaneously. It is especially suitable for cleaning lithium battery material dust with strong adhesion due to moisture, oil or residual alkali. It can reduce the probability of dust absorbing moisture and caking on the surface of the filter bag 91.

[0054] The elastic strip 951 is hollow and preferably made of a flexible elastic material that is oil-resistant, water-resistant, alkali-resistant, and does not easily shed dust, such as fluororubber, silicone rubber, polyurethane elastomer, or EPDM rubber. It can also be an elastic rubber strip with an outer polytetrafluoroethylene layer. To adapt to the dusty environment of lithium battery materials, the elastic strip 951 can be made of conductive material to prevent static electricity accumulation and avoid static electricity accumulation during the rotation and agitation of the filter bag 91 and the protective frame 94. At the same time, the elastic strip 951 should have good bending fatigue resistance and resilience, so that it hangs naturally under normal conditions and can be straightened when the vertical cylinder 953 is rotated by high-pressure gas, and can produce a flexible tapping effect on the protective frame 94 or the filter bag 91. This can help shake off the dust on the surface of the filter bag 91 without causing hard scratches or material contamination to the filter bag 91. Furthermore, during the operation of the filter bag 91, the filtered gas is unlikely to enter the interior of the vertical cylinder 953 through the elastic strip 951. Even if a small amount enters, it will not affect the normal operation of the system.

[0055] In addition, the pressure sensor 956 is electrically connected to an external controller and is equipped with an independent power supply to monitor the gas pressure during each backflushing process. After the compressed gas enters the vertical cylinder 953, a portion of the gas pressure acts on the piston rod 954, causing the piston rod 954 to move axially along the vertical cylinder 953 and compress the return spring 955. The compression of the return spring 955 is related to the current gas pressure and the backflushing resistance of the filter bag 91. After the piston rod 954 moves, it applies detection pressure to the pressure sensor 956, and the pressure sensor 956 transmits the detection signal to the outside. If the controller detects a pressure lower than the set range, it indicates insufficient pressure of the compressed gas before and after entering the vertical cylinder 953. This may be due to insufficient air supply from the air pump 3, abnormal opening of the solenoid valve 31, air leakage from the air distribution pipe 8 or connector 97, or detachment of the air blowing pipe 952, resulting in insufficient backflushing intensity. If the detected pressure is higher than the set range, it indicates an abnormal increase in back pressure in the vertical cylinder 953, air blowing pipe 952, or filter bag 91 area. This may be due to an excessively thick dust layer on the surface of the filter bag 91, severe moisture absorption and clumping, or partial blockage of the backflushing channel, making it difficult for conventional pulse backflushing to continue effectively cleaning the dust. Through the cooperation of the pressure sensor 956, piston column 954, and return spring 955, the gas backflushing state can be converted into a detectable pressure signal, which allows the controller to determine whether the equipment is in a normal dust cleaning state and to issue maintenance, enhanced backflushing, or shutdown maintenance prompts when the pressure is abnormal, thereby improving the safety and continuity of dust collector operation.

[0056] It should be noted that the specific model and specifications of electrical components need to be selected and determined based on the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, so they will not be described in detail here.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A bag filter for lithium battery material production, comprising an extension box (2) and a filter box (4), wherein a support plate (10) is provided between the extension box (2) and the filter box (4), characterized in that, The support plate (10) is connected to a filter assembly (9), which is used to improve the dust removal effect of the equipment.

2. The bag filter for lithium battery material production according to claim 1, characterized in that, The outer wall of the filter box (4) is fixedly connected to a fixing frame (6), one end of the filter box (4) is fixedly connected to a dust collection bin (5), and the other end of the filter box (4) is fixedly connected to the extension box (2) and the support plate (10) respectively by bolts. The side wall of the support plate (10) is provided with an installation plate (7).

3. A bag filter for lithium battery material production according to claim 2, characterized in that, The extension box (2) is provided with an air distribution pipe (8) inside, an exhaust pipe (1) is provided on the side wall of the extension box (2), an air pump (3) is provided on the outer wall of the extension box (2), the air pump (3) is connected to a solenoid valve (31), and one end of the air distribution pipe (8) passes through the extension box (2) and is fixedly connected to the solenoid valve (31).

4. A bag filter for lithium battery material production according to claim 3, characterized in that, The filter assembly (9) includes a card holder (92), one end of which is fixedly connected to a protective frame (94). A filter bag (91) is fitted on the outer wall of the protective frame (94). The card holder (92) is snapped and fixed to a support plate (10). One end of the protective frame (94) is fixedly connected to a base (96), and a rotating seat (961) is rotatably connected to the side wall of the base (96).

5. A bag filter for lithium battery material production according to claim 4, characterized in that, The filter assembly (9) further includes a separation mechanism (93), which includes an air inlet pipe (931) and an outer cylinder (933). One end of the outer cylinder (933) is fixedly connected to the outer wall of the air distribution pipe (8). Both ends of the air inlet pipe (931) are fixedly connected to the outer walls of the outer cylinder (933) and the air distribution pipe (8), respectively. A guide cone (932) and a separator cylinder (936) are fixedly connected inside the outer cylinder (933). The guide cone (932) is located inside the separator cylinder (936).

6. A bag filter for lithium battery material production according to claim 5, characterized in that, The inner wall of the outer cylinder (933) is fixedly connected to a spiral plate (935), and the inner wall of the outer cylinder (933) is provided with a number of cohesive ribs (934). The side wall of the spiral plate (935) is fixedly connected to a baffle (9351).

7. A bag filter for lithium battery material production according to claim 6, characterized in that, The outer cylinder (933) is detachably connected to a mounting base (938) at the end away from the air distribution pipe (8). A connector (97) is fixedly connected to one end of the mounting base (938). An adsorption core (939) is provided inside the mounting base (938). An inner cylinder (937) is fixedly connected to one end of the outer cylinder (933). The inner cylinder (937) is located between the guide cone (932) and the separator cylinder (936). The end of the inner cylinder (937) near the guide cone (932) is flared.

8. A bag filter for lithium battery material production according to claim 7, characterized in that, The mounting base (938) has a liquid collection tank (9381) on its side wall. The inner wall of the liquid collection tank (9381) has a plurality of permeation tanks (9382) arranged in a circular array. The inner wall of the permeation tank (9382) has a discharge slot (9383) which is arranged in an "S" shape. One side of the discharge slot (9383) is in contact with the adsorption core (939).

9. A bag filter for lithium battery material production according to claim 8, characterized in that, The filter assembly (9) further includes a disengagement mechanism (95), which includes a vertical cylinder (953). One end of the vertical cylinder (953) is rotatably connected to a connector (97), and the other end of the vertical cylinder (953) is fixedly connected to the inner wall of a rotating seat (961). A pressure sensor (956) is fixedly connected to the inner wall of the rotating seat (961).

10. A bag filter for lithium battery material production according to claim 9, characterized in that, The vertical cylinder (953) is equipped with a piston column (954) and a return spring (955) inside. The piston column (954) is T-shaped. The two ends of the return spring (955) are fixedly connected to the inner wall of the rotating seat (961) and the side wall of the piston column (954), respectively. The outer wall of the vertical cylinder (953) is fixedly connected with a number of spirally distributed air blowing pipes (952). The air blowing pipes (952) are L-shaped. One end of the air blowing pipe (952) is provided with an elastic strip (951).

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