Conveying device for adjusting the distribution of magnetic foreign bodies in a coating and coating apparatus

Abstract

The present application relates to the field of coating equipment, and particularly provides a conveying device for adjusting the distribution of magnetic foreign matters in a coating and a coating equipment, aiming to solve the problem of unstable distribution of magnetic foreign matters in the coating during the coating process. To this end, the conveying device for adjusting the distribution of magnetic foreign matters in a coating comprises a conveying roller and a pulse electromagnetic assembly, the conveying roller rotates to move a to-be-conveyed piece wrapped on the conveying roller, and the pulse electromagnetic assembly is arranged inside the conveying roller and always located in a fan-shaped solid area corresponding to the to-be-conveyed piece and the wrapping surface of the conveying roller. Through the above scheme, the distribution of magnetic foreign matters in the coating can be more uniform and stable, the quality of the coating can be improved, and the safety hazard caused by the magnetic foreign matters in the coating can be avoided.

Description

Technical Field

[0001] This invention relates to the field of coating equipment, specifically providing a conveying device and coating equipment for adjusting the distribution of magnetic foreign matter in the coating. Background Technology

[0002] Lithium-ion batteries for automobiles, as a type of high-energy-density electrochemical battery unit, can be used in various consumer products and vehicles such as hybrid electric vehicles (HEVs) and pure electric vehicles (EVs). A typical power battery usually includes the following components: positive and negative electrodes that can intercalate / deintercalate lithium ions, a separator containing electronic insulation and ion transport functions between the positive and negative electrodes, an electrolyte that conducts lithium ions, and accessories such as current collectors, tabs, and casing.

[0003] Currently, thermal runaway in lithium-ion batteries is a major safety concern, primarily caused by magnetic foreign objects piercing the separator within the cell. This piercing can occur in two ways: first, the foreign object is too close to the outer edge of the positive and negative electrode coatings. During hot pressing, the compression of the electrode foils, coatings, and separator causes the foreign object to pierce the separator, resulting in a short circuit. Second, the positive electrode has a very high potential, causing the magnetic foreign object to oxidize and dissolve into ions. When these dissolved metal ions migrate to the surface of the negative electrode under the influence of an electric field, the extremely low electrode potential of the negative electrode reduces these ions to a metallic state, forming dendrites. When these dendrites grow large enough to pierce the separator, they cause a short circuit and physical self-discharge, ultimately leading to thermal runaway.

[0004] As can be seen from the above analysis, the removal of magnetic foreign matter in the manufacturing process of power batteries is a very important step. Therefore, in the current manufacturing of power batteries, after the positive and negative electrode materials form a slurry with conductive agents, binders and solvents, the slurry is generally demagnetized by a permanent magnet demagnetizing device to remove magnetic foreign matter before being coated onto the surface of the positive and negative electrode foils to form electrodes. Furthermore, existing equipment for coating other products does not offer a more effective solution for demagnetization steps.

[0005] However, existing demagnetization technology involves placing permanent magnets inside the slurry tank. The choice of magnetic field strength makes demagnetization difficult. If the magnetic field strength is too high, it will cause nickel deposition risk. If the magnetic field strength is too low, it will not be able to attract weak magnetic foreign objects. Therefore, the demagnetization effect is limited and difficult to control in actual battery manufacturing. As a result, some magnetic foreign objects will still remain in the slurry and be coated on the foil during the coating process of battery cell manufacturing. After subsequent hot pressing, they may puncture the separator, causing short circuit and physical self-discharge, ultimately leading to battery thermal runaway accidents.

[0006] Accordingly, there is a need in the art for a new coating apparatus to solve the above problems. Summary of the Invention

[0007] This invention aims to solve the aforementioned technical problem, namely, the unstable distribution of magnetic foreign matter within the coating during the coating process in the prior art. To this end, this invention provides a conveying device for adjusting the distribution of magnetic foreign matter in a coating, the conveying device comprising:

[0008] A conveyor roller, which rotates to move the item to be conveyed that is wrapped around the conveyor roller;

[0009] A pulsed electromagnetic component is disposed inside the conveying roller and is always located within the fan-shaped three-dimensional region corresponding to the surface of the conveying roller and the object to be conveyed.

[0010] In a specific embodiment of the above-described conveying device for adjusting the distribution of magnetic foreign matter in the coating, the conveying device further includes:

[0011] A drive shaft, which is connected to the conveyor roller in a driving manner;

[0012] A support assembly is fixedly connected to the pulse electromagnetic assembly so that the pulse electromagnetic assembly is always located within the fan-shaped three-dimensional area corresponding to the surface of the object to be conveyed and the covering surface of the conveying roller; the support assembly is rotatably connected to one end of the conveying roller.

[0013] In a specific embodiment of the above-described conveying device for adjusting the distribution of magnetic foreign matter in the coating, the conveying roller has a receiving cavity, the drive shaft passes through the receiving cavity of the conveying roller, and the support assembly includes:

[0014] A support base, wherein one end of the support base is rotatably connected to the drive shaft, and one end of the conveying roller is rotatably connected to the support base;

[0015] A support member is disposed within the receiving cavity of the conveying roller and sleeved on the drive shaft. One end of the pulse electromagnetic assembly is connected to the support member, and the other end is connected to the support base.

[0016] In the specific embodiment of the above-mentioned conveying device with adjustable magnetic foreign object distribution in the coating, there are multiple pulse electromagnetic components, and multiple mounting slots are spaced apart on the support base along the arc direction of the coating surface of the workpiece to be conveyed and the conveying roller, and the pulse electromagnetic components are inserted into the mounting slots.

[0017] In a specific embodiment of the above-mentioned conveying device for adjusting the distribution of magnetic foreign matter in the coating, the conveying roller has an annular boss at one end near the support base, the support assembly also includes a baffle and a roller, a bearing groove is formed between the baffle and the support base, the roller is rotatably disposed in the bearing groove, and the annular boss is inserted into the bearing groove and abuts against the roller.

[0018] In a specific embodiment of the above-described conveying device for adjusting the distribution of magnetic foreign matter in the coating, the pulse electromagnetic component includes:

[0019] A housing, which is fixedly connected to the support assembly;

[0020] A soft magnet, wherein the soft magnet is disposed on the housing;

[0021] An electromagnetic coil, wherein multiple electromagnetic coils are arranged at intervals along the length of the soft magnet on the housing, the soft magnet passes through the electromagnetic coil, and the electromagnetic coil is provided with a quick-connect connector.

[0022] In a specific embodiment of the above-described conveying device for adjusting the distribution of magnetic foreign matter in the coating, the conveying device further includes:

[0023] A drive unit, the output of which is connected to the drive shaft;

[0024] A pulse electromagnetic controller, which is connected to the quick-connect connector.

[0025] A coating apparatus, comprising a first coating device, a first conveying device, a second coating device, and a second conveying device, wherein the first conveying device and the second conveying device are both conveying devices for adjusting the distribution of magnetic foreign matter in the coating as described in any of the above embodiments.

[0026] The first coating device is disposed on the side of the first conveying device, and the second coating device is disposed on the side of the second conveying device. The conveying directions of the first conveying device and the second conveying device are opposite, and the workpiece to be conveyed forms a first coating surface and a second coating surface with the first conveying device and the second conveying device.

[0027] The outlet ends of the first coating device and the second coating device correspond to the first coating surface and the second coating surface, respectively.

[0028] In the specific embodiment of the coating equipment described above, the coating equipment further includes a first drying tunnel and a second drying tunnel. The first drying tunnel is disposed between the first conveying device and the second conveying device, and the second drying tunnel is disposed on the conveying outlet side of the second conveying device.

[0029] In the specific embodiments of the coating equipment described above, both the first coating device and the second coating device include a slurry demagnetizing tank and a coating head, wherein the slurry demagnetizing tank is connected to the coating head.

[0030] When the above technical solution is adopted, the present invention can transport the item to be transported by a conveying device. Specifically, the item to be transported is wrapped on a conveying roller. Relying on the friction between the conveying roller and the item to be transported, the conveying roller rotates and drives the item to be transported to move. The item to be transported can be a foil material with a coating on its surface, or it can be other items to be transported. There is a certain coating surface between the workpiece to be conveyed and the conveyor roller. A pulsed electromagnetic component is installed inside the conveyor roller. The pulsed electromagnetic component does not rotate with the conveyor roller and always remains in the fan-shaped three-dimensional area corresponding to the coating surface. The conveyor roller rotates, driving the foil material to be coated through the roller surface. The coating is on the surface of the foil material. As the foil material is conveyed, the coating will enter the area corresponding to the coating layer. The pulsed electromagnetic component can generate a pulsed instantaneous high magnetic field intensity, thereby changing the distribution of magnetic foreign particles in the coating. It makes the magnetic foreign particles in the coating distributed closer to the foil material, avoiding random distribution in various depths of the coating, improving the distribution stability of magnetic foreign particles in the coating, and also adjusting the distribution position of magnetic foreign particles in the coating. In addition, the pulsed instantaneous magnetic field can also prevent nickel deposition and improve the quality of the coating. Attached Figure Description

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the structure of coating equipment in the prior art;

[0033] Figure 2 This is an isometric view of the internal structure of the transmission device in this invention, showing the distribution of the pulse electromagnetic components;

[0034] Figure 3 This is a cross-sectional view of the conveying device in this invention, showing the positional relationship between the conveying roller and the pulse electromagnetic assembly;

[0035] Figure 4 This is a side view of the transmission device in this invention, showing the distribution range of the pulse electromagnetic components under the cladding surface;

[0036] Figure 5 This is a schematic diagram of the pulse electromagnetic component in this invention;

[0037] Figure 6 This is an isometric view of the coating equipment structure in this invention;

[0038] Figure 7This is a schematic diagram of the bonding of the coated foil and the diaphragm in this invention, showing the distribution of magnetic foreign matter in the coating in the prior art and in this invention;

[0039] Figure 8 This is a schematic diagram of the pressing of the coated foil and the diaphragm in this invention, which shows the distribution of magnetic foreign matter in the coating in the prior art and in this invention;

[0040] Figure 9 This is a schematic diagram of the coated foil and diaphragm used in this invention, showing the distribution location and morphology of magnetic foreign objects in the coating in the prior art and in this invention.

[0041] In the diagram: 1. Conveyor roller, 2. Pulse electromagnetic assembly, 3. Drive shaft, 4. Receiving cavity, 5. Support base, 6. Support component, 7. Mounting groove, 8. Annular boss, 9. Baffle, 10. Roller, 11. Housing, 12. Soft magnet, 13. Electromagnetic coil, 14. Quick connector, 15. Drive unit, 16. Pulse electromagnetic controller, 17. First coating device, 18. First conveying device, 19. Second coating device, 20. Second conveying device, 21. First drying tunnel, 22. Second drying tunnel, 23. Slurry demagnetizing tank, 24. Coating head, 25. Diaphragm, 26. Foil, 27. Positive active coating, 28. Negative active coating. Detailed Implementation

[0042] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings and in conjunction with the foil coating of a power battery. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, although the specification describes the invention in conjunction with the foil coating of a power battery, this is not limiting, and those skilled in the art can apply the invention to other materials requiring coating or to coating equipment as needed.

[0043] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the relevant devices or elements must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Furthermore, in order to more clearly demonstrate the core technical solution of the present invention, the description of the known structure of the coating equipment is omitted in the following description. However, this omission is only for the convenience of description and does not mean that the coating equipment can be without these structures.

[0046] like Figure 1 As shown, this is a coating system in the prior art, which coats the foil 26 of the power battery, forming coatings on both sides of the foil 26 to provide assembly materials for the subsequent power battery. Specifically, in the existing technology, after the lithium-ion power battery slurry (positive and negative electrode active materials + conductive agent + binder + solvent + other additives) is formed, magnetic foreign matter in the lithium-ion power battery slurry is magnetically removed by the slurry demagnetizing tank 23. Specifically, a demagnetizing rod is installed in the demagnetizing tank to contact the slurry and demagnetize it. Then, the demagnetized slurry is transported to the coating head 24. The foil 26 is driven by the conveyor roller 1 and passes through the discharge end of the coating head 24. First, a coating is formed on one side of the foil 26. This is the first coating station. After the coating is completed, the foil 26 and the coating it covers enter the first drying tunnel 21 for drying and shaping. After the foil 26 comes out of the first drying tunnel 21, it is reversed by the conveyor roller 1. The coating head 24 coats the other side of the foil 26 to form another coating. Then, it enters the second drying tunnel 22 for drying and shaping. After the coating is formed on both sides of the foil 26, the electrode used in the power battery is formed.

[0047] However, existing demagnetization techniques suffer from the problems mentioned in the background section. Firstly, demagnetization within the demagnetizing slurry tube is incomplete, and it is difficult to completely remove magnetic foreign matter. Furthermore, using strong magnetic removal may lead to nickel precipitation. Therefore, it is difficult to avoid the presence of magnetic foreign matter in the slurry before coating. Existing technologies often use direct coating to form a coating on the surface of the foil 26. Magnetic foreign matter in the coating often poses certain safety hazards during subsequent production and use. Current solutions focus on reducing the content of magnetic foreign matter, but the application effect is generally limited. Therefore, reducing safety hazards in the presence of magnetic foreign matter in the coating has become an industry challenge.

[0048] like Figures 2 to 5 As shown, the present invention proposes a conveying device for adjusting the distribution of magnetic foreign matter in a coating, the conveying device comprising:

[0049] A conveyor roller 1, which rotates to move the workpiece to be conveyed that is wrapped around the conveyor roller 1;

[0050] The pulse electromagnetic component 2 is disposed inside the conveying roller 1 and is always located within the fan-shaped three-dimensional area corresponding to the surface of the conveying roller 1 and the object to be conveyed.

[0051] This embodiment is still described in conjunction with the coating of the foil 26 of the power battery. The technical concept of the present invention to solve the above-mentioned industry problem is to improve the conveyor roller 1, thereby changing the distribution of magnetic foreign objects in the coating. In the prior art, the magnetic foreign objects are distributed randomly and disorderly in the coating, which leads to the safety hazards of short circuits and film penetration caused by the magnetic foreign objects located in the middle and upper layers far away from the foil 26. In the present invention, while the conveyor roller 1 conveys the foil 26, the coating device applies the slurry to the surface of the foil 26. By setting an electromagnetic component in the area corresponding to the foil 26 and the coating surface of the conveyor roller 1, the distribution of magnetic foreign objects in the coating is changed, causing the magnetic foreign objects to be distributed closer to the foil 26, making their distribution position more biased and stable. In addition, in order to take into account both the adjustment of the distribution of magnetic foreign objects and the prevention of nickel precipitation in the lithium battery slurry, the electromagnetic component attracts the magnetic foreign objects in the form of a pulsed magnetic field to adjust the distribution. The pulsed changing magnetic field can also prevent nickel precipitation in the slurry, thereby ensuring the quality of the coating.

[0052] Based on the above technical concepts, please refer to Figures 2 to 4 In this embodiment, the component to be conveyed refers to foil 26 and coated foil 26. However, the component to be conveyed is not limited to this; those skilled in the art can replace the material to be conveyed as needed. Specifically, in this embodiment, a conveying roller 1 is used to transport the foil 26. The foil 26 and the conveying roller 1 are in contact, and the rotation of the conveying roller 1 drives the foil 26 to be conveyed. There is a covering surface between the foil 26 and the conveying roller 1. The coating is applied before or during the application of the coating. To address the distribution of magnetic foreign objects in the coating, the initial coating process is optimal. A pulsed electromagnetic component 2 is installed in the fan-shaped three-dimensional area inside the conveying roller 1 corresponding to the covering surface. When the coating is formed on the surface of the foil 26, as it passes the covering surface on the conveying roller 1, under the action of the pulsed electromagnetic component 2 (specifically, the magnetic field strength of the pulsed electromagnetic component 2 is 10000-20000 Gs, and the pulse frequency is 100-1000 Hz), magnetic foreign objects are attracted to the side closer to the foil 26.

[0053] See Figure 7 The depth and location of magnetic foreign matter distribution layers within the coating of the present invention are described in both the prior art and the present invention. Figure 7The left side shows the location of magnetic foreign objects in the coating of the prior art. It can be seen that the distribution of magnetic foreign objects a, b, c, d, and f is disordered and their depths in the coating are also different. Among them, magnetic foreign objects b and e are close to the surface of the coating, magnetic foreign objects a and d are located in the middle, and magnetic foreign objects c and f are close to the foil 26. Figure 7 The right side shows the coating of the foil 26 of the present invention. It can be seen that the magnetic foreign objects a and d, which were originally located in the middle of the coating, are closer to the foil 26. The magnetic foreign objects b and e, which are located on the surface of the coating, are located in the middle of the coating, close to the foil 26. The magnetic foreign objects c and f are closer to the foil 26. It can be seen that the distribution of magnetic foreign objects in the coating of the present invention has been adjusted, and the positions are more stable and orderly, with a certain directionality, and closer to the foil 26.

[0054] After the magnetic foreign matter is distributed in the coating and adjusted by the conveying device of this invention, a stable coating is formed through other auxiliary processes. A hot-pressing process is then performed, where coated foils 26 are placed on both sides of the diaphragm 25, followed by hot pressing. It should be noted that this embodiment is for illustrative purposes; the structure and process may involve other complex steps. (See also...) Figure 8 ,in Figure 8 The left side shows the distribution of magnetic foreign matter after the foil 26 and the diaphragm 25 are hot-pressed in the prior art. Among them, ab is very close to the diaphragm 25, be will pierce the diaphragm 25, and cf will be even closer to the diaphragm 25. Figure 8 The right side shows the distribution of magnetic foreign matter after the foil 26 coating of the present invention is hot-pressed. It can be seen that the ACDF is a certain distance away from the diaphragm 25 and is located in the middle layer. The BE is relatively close to the diaphragm 25 but does not puncture the diaphragm 25. Therefore, the magnetic foreign matter of the present invention will greatly protect the integrity of the diaphragm 25 after hot pressing and reduce the risk of the diaphragm 25 being punctured.

[0055] Based on the above embodiments, one side of the diaphragm 25 is a positive current collector and a positive active coating 27, and the other side is a negative current collector and a negative active coating 28. In this embodiment, the upper layer of the diaphragm 25 is a positive electrode and the lower layer is a negative electrode. During subsequent manufacturing and use, magnetic foreign matter will dissolve into ions and migrate from the positive electrode to the negative electrode. Magnetic foreign matter at the positive electrode will be reduced to dendrites upon reaching the surface of the negative active coating 28. When the migration path is short, the dendrites reduced on the surface of the negative active coating 28 have a smaller area and higher height. However, when the migration distance is long, due to the obstruction of the positive active coating 27, the dendrites formed on the negative active coating 28 have a larger area and lower height. (See also...) Figure 9The left side shows the migration and reduction of magnetic foreign objects into dendrites in existing technology. It can be seen that the dendrite morphology formed by ab is very likely to pierce the separator 25, which will lead to a decrease in the yield of the power battery, and even safety risks such as short circuit, physical discharge, potential difference, and thermal runaway during use. Figure 9 The right side shows the dendrite morphology formed by the magnetic foreign object in this invention. It can be seen that the dendrite formed by the magnetic foreign object is flat, which greatly reduces the risk of the diaphragm 25 being punctured, thereby avoiding the safety hazards in the prior art.

[0056] Based on the above embodiments, see [link / reference] Figure 3 The drive shaft 3 drives the conveyor roller 1 to rotate. Only one end of the drive shaft 3 needs to be connected to the conveyor for transmission; a single method is not limited. In this embodiment, the drive shaft 3 is connected to the drive flange via a key, and the flange is connected to the conveyor roller 1 via a key connection for transmission. Based on the above technical concept of this invention, it is necessary to keep the pulse electromagnetic component 2 within the fan-shaped three-dimensional space corresponding to the covering surface. Again, a single method is not limited. Without deviating from the technical concept of this invention, any method that can keep the pulse electromagnetic component 2 within the covering surface range should be understood as falling within the protection scope of this invention. For example, an inner and outer roller configuration can be used. The inner roller does not rotate and is used to fix the pulse electromagnetic component 2, while the outer roller rotates to achieve conveying. In this embodiment, specifically, a support component is used to fix the pulse electromagnetic component 2 within the covering surface range, and the support component provides rotational support for the conveyor roller 1.

[0057] Based on the above embodiments, please continue to refer to Figure 3 The conveyor roller 1 has a hollow interior, which further reduces the overall weight. The drive shaft 3 passes through the conveyor roller 1 and is connected to the support base 5. The end of the drive shaft 3 connected to the support base 5 uses a bearing to reduce rotational resistance and wear. In order to facilitate the fixing of the pulse electromagnetic component 2, a support 6 is set in the receiving cavity 4. The drive shaft 3 also passes through the support 6. The support 6 and the drive shaft 3 are also connected by a bearing. The pulse electromagnetic component 2 is connected between the support 6 and the support base 5. The end of the pulse electromagnetic component 2 connected to the support base 5 is connected to keep it within the coverage area, and the other end is connected to the support 6 to provide a support point for the connection of the pulse electromagnetic component 2.

[0058] Based on the above embodiments, see [link / reference] Figure 4A mounting groove 7 is provided on the support base 5 to facilitate the installation of the pulse electromagnetic component 2. Multiple pulse electromagnetic components 2 are provided to better radiate the coverage area. Multiple mounting grooves 7 are also provided to cooperate with them. In order to make the coating on the coverage surface receive similar intensity, the mounting grooves 7 are set along the arc direction of the end face of the coverage surface. It is preferred that they are set at equal intervals to make the magnetic field intensity more uniform. The mounting grooves 7 are arranged in an arc, and the corresponding central angle is between 90° and 150°. The specific angle can be selected by those skilled in the art according to the installation needs.

[0059] Based on the above embodiments, see [link / reference] Figure 3 The conveyor roller 1 is rotatably connected to the support base 5. One end of the conveyor roller 1 is driven to rotate by the drive shaft 3, and the other end of the support base 5 provides a rotation support point for the conveyor roller 1. An annular boss 8 is provided at one end of the conveyor roller 1. A baffle 9 is installed on the support base 5, and a bearing groove is formed between the baffle 9 and the support base 5. The annular boss 8 is inserted into the bearing groove to form a positioning support. In order to reduce friction and improve the stability of the conveyor roller 1, a roller 10 is installed in the bearing groove to achieve rolling friction. The conveyor roller 1 rotates stably, and the coating thickness is also stable, thus improving the coating quality.

[0060] Based on the above embodiments, see [link / reference] Figure 5 The pulse electromagnetic component 2 is specifically a housing 11, which is connected to a support component. Specifically, both ends of the housing 11 are connected to the support base 5 and the support member 6. A soft magnet 12 is installed on the housing 11, and electromagnetic coils 13 are also installed at intervals along the length of the housing 11. The soft magnet 12 passes through the electromagnetic coils 13. The electromagnetic coils 13 charge and demagnetize the soft magnet 12 through the pulse electromagnetic controller 16. The electromagnetic coils 13 and the soft magnet 12 are covered inside the housing 11 by a coating layer. The coating layer can be composed of stainless steel, epoxy resin, polytetrafluoroethylene (commonly known as Teflon), resin, ceramics, etc. The specific shape of the housing 11 can be flexibly selected according to the actual application scenario, and can be plate-shaped or rod-shaped. The soft magnet 12 can be charged and demagnetized in real time. The pulse electromagnetic controller 16 is composed of a pulse generator, PLC, HMI and other control electrical components. In addition, the drive shaft 3 is driven by the drive unit 15, which preferably is a servo motor with high control precision.

[0061] The present invention also proposes a coating device, see reference. Figure 6The first conveying device 18 and the second conveying device 20 are conveying devices for adjusting the distribution of magnetic foreign matter in the coating as described in the above embodiment. Specifically, the overall equipment adopts a layout that is largely the same as the prior art. The first coating device 17 and the first conveying device 18 coat one side of the foil 26 and adjust the distribution of magnetic foreign matter in the coating. In order to improve the adjustment effect, the range corresponding to the coating surface on the first coating device 17 and the first conveying device 18 is as close as possible. Correspondingly, the slurry extruded from the first coating device 17 can be attracted by the pulse magnetic field at the first time, and then dried and shaped through the first drying tunnel 21. The second conveying device 20 rotates in the opposite direction to the first conveying device 18, thereby coating the other side and drying it using the second drying tunnel 22. The coating and magnetic impurity distribution adjustment of the other side are the same as the first coating. The first coating device 17 and the second coating device 19 are both slurry demagnetizing tanks 23 to remove impurities from the slurry for the first time and then connected to the coating head 24 for coating operations.

[0062] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A conveying device for adjusting the distribution of magnetic foreign matter in a coating, characterized in that, The conveying device includes: A conveyor roller (1) rotates to move the workpiece to be conveyed that is wrapped around the conveyor roller (1); Pulse electromagnetic component (2), the pulse electromagnetic component (2) is disposed inside the conveying roller (1) and is always located in the fan-shaped three-dimensional area corresponding to the covering surface of the conveying roller (1) and the object to be conveyed; The conveying device further includes: Drive shaft (3), said drive shaft (3) being connected to the conveyor roller (1) in a transmission manner; and A support assembly is fixedly connected to the pulse electromagnetic assembly (2) so that the pulse electromagnetic assembly (2) is always located within the fan-shaped three-dimensional area corresponding to the covering surface of the object to be conveyed and the conveying roller (1); the support assembly is rotatably connected to one end of the conveying roller (1); The conveyor roller (1) has a receiving cavity (4), and the drive shaft (3) passes through the receiving cavity (4) of the conveyor roller (1). The support assembly includes a support base (5), which is rotatably connected to one end of the drive shaft (3), and one end of the conveying roller (1) is rotatably connected to the support base (5); The pulse electromagnetic component (2) is multiple, and multiple mounting slots (7) are spaced apart on the support base (5) along the arc direction of the covering surface of the conveying component and the conveying roller (1). The pulse electromagnetic component (2) is inserted into the mounting slot (7).

2. The conveying device for adjusting the distribution of magnetic foreign matter in the coating according to claim 1, characterized in that, The support components also include: Support member (6) is disposed in the receiving cavity (4) of the conveying roller (1) and sleeved on the drive shaft (3). One end of the pulse electromagnetic component (2) is connected to the support member (6) and the other end is connected to the support seat (5).

3. The conveying device for adjusting the distribution of magnetic foreign matter in the coating according to claim 1 or 2, characterized in that, The conveying roller (1) has an annular boss (8) at one end near the support base (5). The support assembly also includes a baffle (9) and a roller (10). A bearing groove is formed between the baffle (9) and the support base (5). The roller (10) is rotatably disposed in the bearing groove. The annular boss (8) is inserted into the bearing groove and abuts against the roller (10).

4. The conveying device for adjusting the distribution of magnetic foreign matter in the coating according to any one of claims 1 to 3, characterized in that, The pulse electromagnetic component (2) includes: Housing (11), the housing (11) being fixedly connected to the support assembly; A soft magnet (12) is disposed on the housing (11); Electromagnetic coils (13) are multiple and spaced apart along the length of the soft magnet (12) on the housing (11). The soft magnet (12) passes through the electromagnetic coils (13). A quick-connect connector (14) is provided on the electromagnetic coils (13).

5. The conveying device for adjusting the distribution of magnetic foreign matter in the coating according to claim 4, characterized in that, The conveying device further includes: A drive unit (15) is provided, the output of which is connected to the drive shaft (3). A pulse electromagnetic controller (16) is connected to the quick-connect connector (14).

6. A coating apparatus, characterized in that, The coating equipment includes a first coating device (17), a first conveying device (18), a second coating device (19), and a second conveying device (20). The first conveying device (18) and the second conveying device (20) are both conveying devices for adjusting the distribution of magnetic foreign matter in the coating as described in any one of claims 1 to 5. The first coating device (17) is disposed on the side of the first conveying device (18), and the second coating device (19) is disposed on the side of the second conveying device (20). The conveying directions of the first conveying device (18) and the second conveying device (20) are opposite, and the workpiece to be conveyed forms a first coating surface and a second coating surface with the first conveying device (18) and the second conveying device (20). The outlet ends of the first coating device (17) and the second coating device (19) correspond to the first coating surface and the second coating surface, respectively.

7. The coating equipment according to claim 6, characterized in that, The coating equipment also includes a first drying tunnel (21) and a second drying tunnel (22). The first drying tunnel (21) is located between the first conveying device (18) and the second conveying device (20), and the second drying tunnel (22) is located on the conveying outlet side of the second conveying device (20).

8. The coating equipment according to claim 6 or 7, characterized in that, The first coating device (17) and the second coating device (19) both include a slurry demagnetizing tank (23) and a coating head (24), wherein the slurry demagnetizing tank (23) is connected to the coating head (24).

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