Medium-high filter cloth air floating roller, air floating roller device and lithium battery coating equipment

Abstract

According to the medium-high filter cloth air floating roller, the air floating roller device and the lithium battery coating equipment, high-pressure gas is injected into a pressure equalizing pipe, enters an outer cavity through air outlet holes and forms an air film on the surface of filter cloth. The whole outer cavity is high in middle and low in two sides, the gas flow in the middle area is large, the gas film is thicker, the supporting force of the gas film in the center area is improved, the middle of the pole piece can be tensioned and flattened, and the pole piece is prevented from wrinkling. Besides, if the filter cloth is polluted by slurry, the filtering precision of the filter cloth is reduced, and the supporting force of an air film is influenced, new and old filter cloth can be conveniently replaced through the first mounting piece and the second mounting piece, so that the problem that the roller surface of an existing air floating roller cannot be replaced is solved, the cost generated by replacing the whole roller is reduced, the overall production cost is reduced, and the service life of the air floating roller is prolonged. And moreover, the time consumed for cleaning the roller surface is greatly saved, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery electrode coating, specifically to a medium-high profile filter cloth air flotation roller, an air flotation roller device, and lithium battery coating equipment. Background Technology

[0002] To improve efficiency, lithium battery electrodes often employ a double-sided coating process during manufacturing. In double-sided simultaneous coating equipment, air-bearing rollers are the most commonly used type of non-contact roller. When high-pressure gas is introduced into the roller, an air film forms on its surface, supporting the foil's movement and reversal. Electrodes are prone to longitudinal stretching or uneven tension at both ends due to heat deformation in the oven. If the air-bearing roller has a fixed, uniform air outlet structure, insufficient tension in the central area of ​​the foil can easily occur, leading to electrode wrinkling and the air-bearing roller scraping the slurry. To address this issue, existing technology provides a medium-high shaped air-bearing roller to increase the supporting tension in the central area and tighten the electrode. However, the roller surface of existing medium-high shaped air-bearing rollers is integrally formed from a sintered mesh, requiring very high precision in surface machining. If the cylindricity of the roller surface cannot be guaranteed, uneven air film support can easily occur, further exacerbating electrode wrinkling. Furthermore, the cost of the air flotation rollers for sintered mesh is high and they cannot be replaced. After each scraping of the slurry, due to their high filtration precision and small pores, they are difficult to clean and require several hours of ultrasonic cleaning, which affects production efficiency. Moreover, after scraping the same position multiple times, the precision of the roller surface and the uniformity of the air film will be seriously affected, requiring the replacement of a new roller, which is not conducive to controlling production costs. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a medium-high shaped filter cloth air flotation roller, an air flotation roller device and a lithium battery coating equipment, which can solve the problems of existing air flotation rollers scraping the slurry, high production cost and non-replaceable roller surface.

[0004] The technical solution adopted by the present invention to solve its technical problem is as follows: Firstly, a medium-high profile filter cloth air flotation roller is provided, comprising a pressure equalization tube, a filter cloth, and several supporting ribs. The filter cloth is mounted on the pressure equalization tube by two first mounting members and two second mounting members. The two first mounting members and the two second mounting members are all disposed on the pressure equalization tube. The two ends of the filter cloth are detachably connected to the two first mounting members, and the two sides of the filter cloth are detachably connected to the two second mounting members. The filter cloth and the pressure equalization tube enclose an outer cavity, and the outer cavity communicates with the inner cavity of the pressure equalization tube through several air outlets. Several supporting ribs are arranged circumferentially along the pressure equalization tube and located between the pressure equalization tube and the filter cloth. The outer sides of several supporting ribs are all configured as arc-shaped surfaces protruding outward from the center. Several air outlets are all disposed in the middle of the pressure equalization tube.

[0005] As a further improvement to the above technical solution, the first mounting component includes an eccentric rod, the second mounting component includes an arc-shaped pressure strip, and the pressure equalizing pipe is provided with a filter cloth pressing plate and an arc-shaped connecting plate. The space enclosed by the pressure equalizing pipe, the filter cloth, the filter cloth pressing plate, and the connecting plate is the outer cavity. The supporting rib, the filter cloth pressing plate, and the eccentric rod are arranged parallel to each other. The connecting plate is located at the end of the pressure equalizing pipe. The ends of the supporting rib and the filter cloth pressing plate are both fixedly connected to the connecting plate, and one side of the filter cloth pressing plate is connected to the surface of the pressure equalizing pipe. The pressure strip is snapped onto the outside of the connecting plate and the two are concentrically arranged. The side of the filter cloth is clamped between the pressure strip and the connecting plate. The eccentric rod is rotatably mounted on the pressure strip, and the end of the filter cloth is clamped between the eccentric rod and the filter cloth pressing plate.

[0006] As a further improvement to the above technical solution, the eccentric rod includes a rod body and two rotating shafts, the two rotating shafts are respectively connected to the two ends of the rod body, and the axis of the rod body is misaligned with the axis of the rotating shaft; the end of the pressure strip is provided with a connecting hole, the rotating shaft passes through the connecting hole, and the rotating shaft is connected to a handwheel.

[0007] As a further improvement to the above technical solution, the end of the pressure strip is provided with a mounting part, the connecting hole is a slot and is provided on the mounting part, the length direction of the connecting hole is the same as the arrangement direction of the eccentric rod and the filter cloth pressing plate, the mounting part is provided with a through hole on the side away from the filter cloth pressing plate, the through hole communicates with the connecting hole, and a set screw is provided in the through hole, the set screw fixes the eccentric rod in the connecting hole and presses the mounting part on the filter cloth pressing plate.

[0008] As a further improvement to the above technical solution, the pressure equalizing pipe is provided with a plurality of support plates, which are evenly arranged along the axial direction of the pressure equalizing pipe, and the support ribs are all connected to the plurality of support plates.

[0009] As a further improvement to the above technical solution, the supporting plates divide the outer cavity into several air outlet chambers, and the supporting plates are provided with several ventilation holes, which connect two adjacent air outlet chambers.

[0010] As a further improvement to the above technical solution, one end of the equalizing pipe is provided with a sealing cover plate, and the other end is provided with a flange joint, and a fixed shaft joint is provided on the sealing cover plate.

[0011] As a further improvement to the above technical solution, one end of the equalizing pipe is provided with a circular ruler coaxially arranged therewith, and the circular ruler is engraved with degrees.

[0012] Secondly, an air flotation roller device is provided, including an air supply component and the aforementioned medium-high profile filter cloth air flotation roller, wherein the air supply component is used to deliver high-pressure gas into the pressure equalization tube.

[0013] Thirdly, a lithium battery coating apparatus is provided, comprising a coating device, an oven, and the aforementioned air flotation roller device, wherein the coating device is used to coat a slurry onto a current collector, and the oven is used to dry the electrode sheet.

[0014] The beneficial effects of this invention are as follows: The medium-high profile filter cloth air flotation roller injects high-pressure gas into the equalizing pipe. This high-pressure gas enters the outer cavity through the air outlet and forms an air film on the filter cloth surface to support the electrode transport. Because the outer sides of the supporting ribs are all designed as arcs bulging outwards from the center, the outer cavity is generally high in the middle and low on both sides. Furthermore, the air outlet is located in the middle of the equalizing pipe, resulting in a large gas flow rate and a thicker air film in the central region. This enhances the supporting force of the air film in the central region, tightening and flattening the center of the electrode, preventing wrinkling. Additionally, if the filter cloth is contaminated with slurry, the old and new filter cloths can be replaced using the first and second mounting components. This solves the problem of the non-replaceable roller surface of existing air flotation rollers and reduces the cost of replacing the entire roller, lowering the overall production cost. It also significantly saves time spent cleaning the roller surface, improving production efficiency. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of the medium-high shaped filter cloth air flotation roller provided in a preferred embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of section A; Figure 3 This is a schematic diagram of the structure of the medium-high shaped filter cloth air flotation roller provided in a preferred embodiment of the present invention from another angle; Figure 4 yes Figure 3 Enlarged view of section B; Figure 5 This is an exploded view of the medium-high profile filter cloth air flotation roller provided in a preferred embodiment of the present invention; Figure 6 yes Figure 5 Enlarged view of section C; Figure 7 This is a schematic diagram of the eccentric rod provided in a preferred embodiment of the present invention; Figure 8 This is a cross-sectional view of the medium-high profile filter cloth air flotation roller provided in a preferred embodiment of the present invention; Figure 9 This is a schematic diagram of the arc-shaped structure in which the support rib protrudes outward from the middle, as provided in a preferred embodiment of the present invention.

[0017] Attached reference numerals: 1. Equalizing tube; 2. Filter cloth; 3. Support rib. 12. Outer cavity, 13. Connecting plate, 14. Support plate, 15. Sealing cover, 16. Flange joint, 17. Gasket, 18. Circular ruler, 19. Filter cloth pressing plate, 20. First mounting part, 22. Second mounting part, 23. Top screw; 111. Outer side, 121. Outer cavity, 141. Ventilation hole, 151. Fixed shaft joint, 221. Eccentric rod, 223. Pressure strip, 224. Rod body, 225. Rotating shaft, 226. Connecting hole, 227. Handwheel, 228. Mounting part, 229. Through hole. Detailed Implementation

[0018] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. Detachable connections can use screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., as needed. The various technical features in this invention can be combined interactively without contradicting each other.

[0019] Please see Figure 1 , 5 A preferred embodiment of the present invention provides a medium-high profile filter cloth air flotation roller, comprising an equalizing tube 1, a filter cloth 2, and several supporting ribs 3. Please refer to [link to relevant documentation]. Figure 8 The filter cloth 2 is used to enclose the pressure equalizing pipe 1 to form an outer cavity 12. The outer cavity 12 is connected to the inner cavity of the pressure equalizing pipe 1 through several air outlets 11. The support ribs 3 are arranged circumferentially along the pressure equalizing pipe 1 and are located between the pressure equalizing pipe 1 and the filter cloth 2. Please refer to [link to relevant documentation]. Figure 9 The outer sides of several supporting ribs 3 are all set as arcs protruding outward from the middle, and several air outlets 11 are all set in the middle of the pressure equalizing pipe 1. By injecting high-pressure gas into the pressure equalizing pipe 1, the high-pressure gas enters the outer cavity 12 through the air outlets 11 and forms an air film on the surface of the filter cloth 2 for supporting the transmission of the electrode sheet. In this technical solution, the filter cloth 2 essentially forms the roller surface of the entire medium-high shaped filter cloth air flotation roller.

[0020] For details, please see Figure 1 , 2 5. The filter cloth 2 is mounted on the pressure equalization pipe 1 via two first mounting members 20 and two second mounting members 22. Specifically, the two sides of the filter cloth 2 are detachably mounted on both sides of the pressure equalization pipe 1 via two first mounting members 20, and the two ends of the filter cloth 2 are detachably mounted on both ends of the pressure equalization pipe 1 via two second mounting members 22. Both the two first mounting members 20 and the two second mounting members 22 are mounted on the pressure equalization pipe 1, and the filter cloth 2 and the pressure equalization pipe 1 enclose an outer cavity 12. The filter cloth 2 is tensioned on several support ribs 3. Since the outer sides of the support ribs 3 are all designed as arcs protruding outward from the center, the outer cavity 12 is generally high in the middle and low on both sides. Moreover, the air outlet 11 is located in the middle of the pressure equalization pipe 1. Therefore, the gas flow rate in the middle region is large and the gas film is thicker, which improves the support force of the gas film in the central region. This can tighten and flatten the middle part of the electrode sheet and prevent the electrode sheet from wrinkling. In addition, if the filter cloth 2 is contaminated by slurry, its filtration accuracy will be reduced, affecting the air film support force. The replacement of the old and new filter cloth 2 can be achieved through the first mounting part 20 and the second mounting part 22, which solves the problem that the existing air flotation roller surface cannot be replaced and reduces the cost of replacing the entire roller, thereby reducing the overall production cost and greatly saving the time spent cleaning the roller surface, thus improving production efficiency.

[0021] Please see Figure 2 , 46. In this embodiment, the first mounting component 20 includes an eccentric rod 221, the second mounting component 22 includes an arc-shaped pressure strip 223, the pressure equalizing pipe 1 is provided with a filter cloth pressing plate 19 and an arc-shaped connecting plate 13, and the space enclosed by the pressure equalizing pipe 1, the filter cloth 2, the filter cloth pressing plate 19 and the connecting plate 13 is the outer cavity 12. The support rib 3, filter cloth pressing plate 19, and eccentric rod 221 are arranged parallel to each other. The connecting plate 13 is located at the end of the pressure equalizing pipe 1. The ends of the support rib 3 and the filter cloth pressing plate 19 are fixedly connected to the connecting plate 13, and one side of the filter cloth pressing plate 19 is connected to the surface of the pressure equalizing pipe 1. The pressure strip 223 is snapped onto the outside of the connecting plate 13 and the two are concentrically arranged. The two ends of the filter cloth 2 along the length direction of the pressure equalizing pipe 1 are clamped between the pressure strip 223 and the connecting plate 13. The eccentric rod 221 is rotatably mounted on the pressure strip 223. The two sides of the filter cloth 2 are clamped between the eccentric rod 221 and the filter cloth pressing plate 19. Under the clamping of the pressure strip 223 and the connecting plate 13, as well as the clamping of the eccentric rod 221 and the filter cloth pressing plate 19, the filter cloth 2 can form an outer cavity 12 with the surface of the pressure equalizing pipe 1. When gas flows from the inner cavity of the pressure equalizing pipe 1 through several air outlets 11 into the outer cavity 12, the gas entering the outer cavity 12 passes through the fine pores of the filter cloth 2 and flows out from the outer surface of the filter cloth 2, thereby forming an air film on the surface of the filter cloth 2. By rotating the eccentric rod 221, the gap between the eccentric rod 221 and the filter cloth pressing plate 19 can be changed, which facilitates the disassembly and assembly of the end of the filter cloth 2. The disassembly and assembly of the pressure strip 223 and the connecting plate 13 can realize the disassembly and assembly of the side of the filter cloth 2. The entire filter cloth 2 is easy to disassemble and assemble, which is conducive to improving production efficiency.

[0022] Please refer to 5-7. More specifically, the eccentric rod 221 includes a rod body 224 and two rotating shafts 225. The two rotating shafts 225 are respectively connected to the two ends of the rod body 224, and the axis of the rod body 224 is misaligned with the axis of the rotating shafts 225. The end of the pressure strip 223 is provided with a connecting hole 226. The rotating shaft 225 passes through the connecting hole 226 and is connected to a handwheel 227. By rotating the handwheel 227, the rotating shaft 225 can be driven to rotate within the connecting hole 226, and the rod body 224 will rotate eccentrically. When the side of the rod body 224 that protrudes more from the rotating shaft 225 faces the filter cloth pressing plate 19, the filter cloth 2 is clamped between the rod body 224 and the filter cloth pressing plate 19. Conversely, the gap between the rod body 224 and the filter cloth pressing plate 19 increases, and the filter cloth 2 can be removed.

[0023] Please see Figure 6The end of the pressure strip 223 is provided with a mounting part 228. The connecting hole 226 is a slot and is provided on the mounting part 228. The length direction of the connecting hole 226 is the same as the arrangement direction of the eccentric rod 221 and the filter cloth pressing plate 19. A through hole 229 is provided on the side of the mounting part 228 away from the filter cloth pressing plate 19. The through hole 229 communicates with the connecting hole 226, and a set screw 23 is provided in the through hole 229. The set screw 23 fixes the eccentric rod 221 in the connecting hole 226 and presses the mounting part 228 on the filter cloth pressing plate 19. The set screw 23 can further fix the pressure strip 223 and prevent the eccentric rod 221 from rotating, thereby making the filter cloth 2 more firmly fixed. The set screw 23 is easy to install and remove, which further facilitates use. In specific implementation of the present invention, the two ends of the filter cloth 2 are pressed by the pressure strip 223, and then the two sides of the filter cloth 2 are pressed by the eccentric rod 221 to achieve the fixed installation of the filter cloth 2. In this technical solution, after the eccentric rod 221 is fixedly installed, the eccentric rod 221 can simultaneously fix the position of the pressure strip 223, and the two components are fixed synchronously.

[0024] Please see Figure 5 , 8 The equalizing pipe 1 is provided with several support plates 14, which are evenly arranged along the axial direction of the equalizing pipe 1. The support rib 3 is connected to the support plates 14. The support plates 14 can provide stable support for the support rib 3 at all points along its length, preventing the support rib 3 from swinging and affecting the support force of the air film.

[0025] And please see Figure 8 Several support plates 14 divide the outer cavity 12 into several air outlet chambers 121. Several ventilation holes 141 are provided on the support plates 14. The ventilation holes 141 connect two adjacent air outlet chambers 121. High-pressure gas first enters the air outlet chamber 121 located in the middle through the air outlet hole 11. Part of the high-pressure gas is output from the filter cloth 2 in the middle area, and the other part of the high-pressure gas flows into the air outlet chambers 121 on both sides through the ventilation port, and then is output from the filter cloth 2 on both sides. This makes the filter cloth 2 as a whole have strong tension in the middle and weak tension on both sides.

[0026] Please see Figure 1-4 One end of the equalizing pipe 1 is provided with a sealing cover plate 15, and the other end is provided with a flange joint 16. A fixed shaft joint 151 is provided on the sealing cover plate 15. The flange joint 16 is used to connect with an external gas supply device. High-pressure gas flows into the equalizing pipe 1 through the flange joint 16. The fixed shaft joint 151 is used to fix the entire air flotation roller.

[0027] Please see Figure 6In this embodiment, gaskets 17 are provided at both ends of the pressure equalizing pipe 1. The edge of the sealing cover plate 15 is fixedly connected to one of the gaskets 17. The two ends of the filter cloth pressing plate 19 are fixedly connected to the two gaskets 17 respectively. The gaskets 17 facilitate the fixing of the filter cloth pressing plate 19 and the sealing cover plate 15. Furthermore, the connecting plate 13 and the gaskets 17 are integrally formed, and the connection between the two is firm and easy to manufacture.

[0028] To ensure stable airflow, the air flotation roller of this medium-high profile filter cloth is designed for single-sided airflow. For details, please refer to [link / reference]. Figure 5 The equalizing pipe 1 has an air outlet 11 on only one side, and the side with the air outlet 11 on the equalizing pipe 1 is the air outlet side 111. The single-sided air outlet 11 setting allows the gas to be concentrated and output from one angle, which is beneficial to reduce energy consumption. In addition, the airflow field of the single-sided air outlet is simpler and more controllable, which helps to ensure stable operation.

[0029] Please see Figure 2 One end of the equalizing pipe 1 is provided with a circular ruler 18 coaxially arranged with it. The circular ruler 18 is engraved with degrees. Specifically, the circular ruler 18 is fixed on one of the gaskets 17, which is easy to install. The setting of the circular ruler 18 makes it easy for users to grasp the specific value of the air outlet angle, further facilitating use.

[0030] A preferred embodiment of the present invention also provides an air flotation roller device, including an air supply component and a medium-high shaped filter cloth air flotation roller as described in the above embodiment. The air supply component is used to deliver high-pressure gas into the pressure equalization pipe 1. A gas film with a larger gas flow and a thicker gas film is formed in the middle region of the medium-high shaped filter cloth air flotation roller, which improves the support force of the gas film in the central region, can tighten the middle part of the electrode sheet, flatten the middle part of the electrode sheet, and prevent the electrode sheet from wrinkling.

[0031] A preferred embodiment of the present invention also provides a lithium battery coating equipment, including a coating device, an oven, and the air flotation roller device described in the above embodiment. The coating device is used to coat the slurry onto the current collector, and the oven is used to dry the electrode sheet. After the current collector is coated with the slurry, a wet electrode sheet is formed. The wet electrode sheet is fed into the oven for drying through the medium-high profile filter cloth air flotation roller. During the drying process, the middle part of the electrode sheet can be supported by a stronger air film, which can prevent the electrode sheet from wrinkling.

[0032] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A high profile filter cloth air floatation roller characterized by: The equalizing pipe, the filter cloth and the support ribs are arranged, the filter cloth is arranged on the equalizing pipe through the first mounting member and the second mounting member, the filter cloth and the equalizing pipe form an outer cavity, and the outer cavity and the inner cavity of the equalizing pipe are communicated through the air outlet holes.

2. The high-lift cloth floating roller according to claim 1, characterized in that: The first mounting member comprises an eccentric rod, the second mounting member comprises an arc-shaped pressing strip, the equalizing pipe is provided with a filter cloth pressing plate and an arc-shaped connecting plate, the equalizing pipe, the filter cloth, the filter cloth pressing plate and the connecting plate form an outer cavity, the support ribs, the filter cloth pressing plate and the eccentric rod are arranged in parallel, the connecting plate is arranged at the end of the equalizing pipe, the ends of the support ribs and the filter cloth pressing plate are fixedly connected with the connecting plate, and one side of the filter cloth pressing plate is connected with the surface of the equalizing pipe.

3. The high-lift cloth floating roller according to claim 2, characterized in that: The eccentric rod comprises a rod body and two rotating shafts, the two rotating shafts are connected with the two ends of the rod body, and the axis of the rod body is dislocated with the axis of the rotating shafts.

4. The high-lift cloth floating roller according to claim 3, characterized in that: The end of the pressing strip is provided with a connecting hole, the rotating shafts are arranged in the connecting hole, and the rotating shafts are connected with a hand wheel.

5. The high-lift cloth floating roll according to claim 1, wherein: The end of the pressing strip is provided with a mounting portion, the connecting hole is a slot hole and is arranged on the mounting portion, the length direction of the connecting hole is the same as the arrangement direction of the eccentric rod and the filter cloth pressing plate, the side of the mounting portion away from the filter cloth pressing plate is provided with a through hole, the through hole is communicated with the connecting hole, a jackscrew is arranged in the through hole, the jackscrew fixes the eccentric rod in the connecting hole and presses the mounting portion on the filter cloth pressing plate.

6. The high-lift cloth floating roller according to claim 5, characterized in that: The equalizing pipe is provided with a plurality of support plates, the support plates are arranged in the axial direction of the equalizing pipe, and the support ribs are connected with the support plates.

7. The high-lift cloth floating roller according to claim 1, characterized in that: The support plates divide the outer cavity into a plurality of air outlet cavities, the support plates are provided with a plurality of air holes, and the air holes communicate with adjacent air outlet cavities.

8. The high-lift cloth flotation roller of claim 1, wherein: One end of the equalizing pipe is provided with a sealing cover plate, the other end is provided with a flange joint, and the sealing cover plate is provided with a fixed shaft joint.

9. An air floatation roller device characterized by: One end of the equalizing pipe is provided with a circular ruler coaxially arranged thereon, and the circular ruler is marked with degrees.

10. A lithium battery coating apparatus characterized by: The device comprises a gas supply member and the medium-high filter cloth air floating roller, and the gas supply member is used for conveying high-pressure gas into the equalizing pipe. The device comprises a coating device, an oven and the air floating roller device, the coating device is used for coating slurry on a current collector, and the oven is used for drying the pole piece.

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