An oven

Abstract

The utility model discloses a kind of ovens, including upper hull, lower hull and multiple composite air nozzle, inner eight air nozzles, air knife assembly, the upper hull and lower hull are oppositely arranged, the upper hull and lower hull are all spaced apart and provided with multiple air nozzle interfaces, the composite air nozzle is communicated with the air nozzle interface of the upper hull, the air knife assembly is installed on the upper hull, and the air knife assembly is set to the rear end of the composite air nozzle, the air knife assembly is used for the dryness of the thinning area of the both sides of pole piece, the inner eight air nozzles are communicated with the air nozzle interface of the lower hull, and the inner eight air nozzles are set below the air knife assembly, the composite air nozzle is used for drying the upper end of pole piece, and the inner eight air nozzles are used for drying the lower end of pole piece.The oven of the utility model, in combination with multiple air nozzles, can effectively reduce the risk of pole piece shaking and scraping, and the pole piece thinning area is dried later, effectively improving the uniformity of pole piece drying, ensuring pole piece production quality.

Description

Technical Field

[0001] This utility model relates to the field of coating technology, specifically to an oven. Background Technology

[0002] Traditional drying ovens have the following problems when drying lithium battery electrodes: ordinary nozzles cannot perform differentiated drying on the thinned areas of the electrode, resulting in the thinned areas drying too quickly, causing the electrode to curl or crack; the single nozzle structure used in the existing technology cannot provide stable airflow support, and the electrode is prone to shaking during high-speed operation, affecting the drying quality; and the airflow from the upper and lower nozzles may cause the electrode to shift or dry unevenly.

[0003] Therefore, there is a need to provide an oven to solve the above problems. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides an oven that, combined with various air nozzles, can effectively reduce the risk of electrode shaking and scraping, and delay the drying of the thinned areas of the electrode, thereby effectively improving the uniformity of electrode drying and ensuring the quality of electrode production.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An oven includes an upper hull, a lower hull, and multiple composite air nozzles, an inward-pointing air nozzle, and an air knife assembly. The upper and lower hulls are arranged vertically opposite each other. Multiple air nozzle interfaces are spaced apart on both the upper and lower hulls. The composite air nozzles are connected to the air nozzle interfaces of the upper hull. The air knife assembly is mounted on the upper hull and is located at the rear end of the composite air nozzles. The air knife assembly is used for delayed drying of the thinned areas on both sides of the electrode sheet. The inward-pointing air nozzles are connected to the air nozzle interfaces of the lower hull and are located below the air knife assembly. The composite air nozzles are used to dry the upper end of the electrode sheet, and the inward-pointing air nozzles are used to dry the lower end of the electrode sheet.

[0007] As a further improvement to the above technical solution, both the composite nozzle and the internal octagonal nozzle include a nozzle connecting seat, a nozzle housing, a first mesh plate, and a sealing plate. One end of the nozzle housing is provided with an air inlet, and the other end of the nozzle housing is provided with an air outlet. The nozzle connecting seat is connected to the air inlet and to the nozzle interface. The first mesh plate is connected inside the nozzle housing. Both ends of the nozzle housing are connected to the sealing plate. The first mesh plate, the nozzle housing, and the two sealing plates enclose a flow cavity, which communicates with the air inlet.

[0008] As a further improvement to the above technical solution, the composite nozzle also includes a first flow guiding component, which is connected to the air outlet end. A first flow diversion cavity is formed between the first flow guiding component and the first mesh plate, and the flow cavity is connected to the first flow diversion cavity.

[0009] As a further improvement to the above technical solution, the first air guiding component includes a second perforated plate, a third perforated plate, and two diverting plates. The two sides of the second perforated plate are connected to the nozzle housing. The third perforated plate is connected to the outer end of the second perforated plate. The two diverting plates are connected between the second perforated plate and the third perforated plate. The second perforated plate, the third perforated plate, and the two diverting plates form a middle air outlet channel. The third perforated plate and the two diverting plates respectively form two first return air channels. The two ends of the third perforated plate respectively form a first slit air outlet channel with the inner wall of the nozzle housing. The middle air outlet channel and the first slit air outlet channel are both connected to the first diverting cavity. The sealing plate of the composite nozzle is provided with two first ventilation openings, which are connected to the first return air channels.

[0010] As a further improvement to the above technical solution, the second perforated plate includes a first air outlet section, a first diversion section, and a first fixing section. The first air outlet section has the first diversion section and the first fixing section extending from both ends. The first fixing section is fixedly connected to the nozzle housing. A first through hole is provided in the middle of the first air outlet section so that the airflow flows from the first diversion cavity through the first through hole to the middle air outlet channel. The first diversion section is provided with a second through hole so that the airflow flows from the first diversion cavity through the second through hole to the first slit air outlet channel and is then blown out.

[0011] As a further improvement to the above technical solution, the third perforated plate includes a second air outlet section, a first bending section, and a first connecting section. Both ends of the second air outlet section have the first bending section and the first connecting section. The first connecting section is connected to the end of the first air outlet section. A third through hole is provided in the middle of the second air outlet section, and a fourth through hole is provided at both ends of the second air outlet section. One end of the diverter plate is connected to the first air outlet section, and the other end of the diverter plate is connected between the third through hole and the fourth through hole, so that airflow is blown out from the middle air outlet channel through the third through hole, and airflow is blown out from the first return air channel through the fourth through hole.

[0012] As a further improvement to the above technical solution, the inner eight-way nozzle also includes a second flow guiding component, which is connected to the air outlet end. A second flow diversion cavity is formed between the second flow guiding component and the first mesh plate, and the flow cavity is connected to the second flow diversion cavity.

[0013] As a further improvement to the above technical solution, the second airflow guiding component includes a fourth mesh plate and a fifth mesh plate. The two sides of the fourth mesh plate are connected to the nozzle housing, and the fifth mesh plate is connected to the outer end of the fourth mesh plate. A second return air channel is formed between the fifth mesh plate and the fourth mesh plate. The two ends of the fourth and fifth mesh plates respectively form a second slit air outlet channel with the inner wall of the nozzle housing. The second slit air outlet channels are all connected to the second diversion cavity. The sealing plate of the inner eight-nozzle is provided with two second ventilation openings, which are connected to the second return air channel.

[0014] As a further improvement to the above technical solution, the fourth perforated plate includes a cavity section, a first positioning section, a second diversion section, and a second fixing section. The first positioning section, the second diversion section, and the second fixing section extend from both ends of the cavity section. The second fixing section is fixedly connected to the nozzle housing. The second diversion section is provided with a fifth through hole so that airflow flows from the second diversion cavity through the fifth through hole to the second slit air outlet channel and then blows out. The fifth perforated plate includes a third air outlet section, a second bending section, a second positioning section, and a second first connecting section. The second bending section, the second positioning section, and the second connecting section extend from both ends of the third air outlet section. The second positioning section is in close contact with the first positioning section, and the second bending section is located on the extension line of the second diversion section. The third air outlet section is provided with a sixth through hole so that airflow blows out from the second return channel through the sixth through hole.

[0015] As a further improvement to the above technical solution, a mounting position is provided at the rear end of the air nozzle interface of the upper hull, and the air knife assembly is fixedly connected to the mounting position. The air knife assembly includes an air inlet pipe, an air knife nozzle, a slide rail, a sliding bracket, and an L-shaped baffle. The slide rail is fixedly connected to the upper hull, and the air knife nozzle is slidably connected to the slide rail through the sliding bracket. One end of the L-shaped baffle is connected to one side of the air knife nozzle, and the other end of the L-shaped baffle is disposed between the composite air nozzle and the electrode plate.

[0016] The beneficial effects of this utility model are:

[0017] This invention optimizes the combination of a composite air nozzle, an inner-eighths air nozzle, and an air knife assembly. The composite air nozzle is connected to the upper hull and rationally distributes hot air, directly improving the drying efficiency of the upper end of the electrode. The inner-eighths air nozzle is connected to the lower hull, and the figure-eight-shaped air outlet concentrates hot air to form a stable pressure airflow field at the lower end of the electrode. Working in conjunction with the air knife assembly, it reduces the collision of upper and lower airflows, improves drying uniformity, and solves the problems of uneven drying, cracking of thinned areas, and electrode vibration in traditional ovens. It is suitable for efficient drying of lithium battery electrodes. Furthermore, the air knife assembly is installed at the rear end of the composite air nozzle on the upper hull, which can block the direct drying of both ends of the electrode by the composite air nozzle and delay and target the thinned areas of the electrode through controlled airflow, avoiding problems such as cracking caused by excessively rapid drying on both sides of the electrode, and effectively improving the drying quality of the electrode. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the drying oven of this utility model;

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a structural schematic diagram of the upper and lower hulls of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the composite air nozzle of this utility model;

[0023] Figure 5 This is a cross-sectional structural diagram of the composite air nozzle of this utility model;

[0024] Figure 6 This is a schematic diagram of the disassembled structure of the composite air nozzle of this utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the internal octagonal nozzle of this utility model;

[0026] Figure 8 This is a cross-sectional structural diagram of the internal octagonal nozzle of this utility model;

[0027] Figure 9 This is a schematic diagram of the disassembled structure of the internal octagonal nozzle of this utility model;

[0028] Figure 10 This is a structural schematic diagram of the air knife assembly of this utility model.

[0029] Reference numerals: 1. Upper hull; 121. Vent interface; 122. Mounting position; 2. Lower hull;

[0030] 3. Composite air nozzle; 301. First diversion chamber; 302. First ventilation opening; 31. Second perforated plate; 311. First air outlet section; 312. First diversion section; 313. First fixed section; 314. First through hole; 315. Second through hole; 32. Third perforated plate; 321. Second air outlet section; 322. First bending section; 323. First connecting section; 324. Third through hole; 325. Fourth through hole; 33. Diversion plate; 34. Intermediate air outlet channel; 341. Air nozzle connecting seat; 342. Air nozzle shell; 343. First perforated plate; 344. Sealing plate; 345. Air inlet; 346. Flow chamber; 347. Air outlet end; 35. First return air channel; 36. First slit air outlet channel;

[0031] 4. Inward-facing octagonal nozzle; 401. Second diversion cavity; 402. Second vent; 41. Fourth perforated plate; 411. Partition section; 412. First positioning section; 413. Second diversion section; 414. Second fixing section; 415. Fifth through hole; 42. Fifth perforated plate; 421. Third air outlet section; 422. Second bending section; 423. Second positioning section; 424. Second connecting section; 425. Sixth through hole; 43. Second return air duct; 44. Second slit air outlet duct;

[0032] 5. Air knife assembly; 51. Air inlet duct; 52. Air knife nozzle; 53. Slide rail; 54. Sliding bracket; 55. L-shaped baffle;

[0033] 6. Electrode; 61. Thinned area. Detailed Implementation

[0034] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections 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. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.

[0035] Reference Figures 1 to 10An oven includes an upper hull 1, a lower hull 2, and multiple composite air nozzles 3, an inward-facing air nozzle 4, and an air knife assembly 5. The upper hull 1 and lower hull 2 ​​are arranged vertically opposite each other, forming the main frame of the oven, and a drying channel for the transfer of electrode sheets 6 is formed between them. Multiple air nozzle interfaces 121 are spaced apart on both the upper hull 1 and lower hull 2, serving as basic airflow transmission interfaces and providing a stable air source for different functional air nozzles. The composite air nozzles 3 communicate with the air nozzle interfaces 121 of the upper hull 1, enabling the reasonable distribution of the hot air delivered by the air nozzle interfaces 121, applying appropriate wind speed and volume to the upper end of the electrode sheet 6 for rapid drying. The air knife assembly 5 is mounted on the upper hull 1, and because the thinned areas 61 on both sides are relatively thin, prone to over-drying, the air knife assembly 5 is positioned at the rear end of the composite air nozzles 3. The L-shaped baffle 55 at the front end of the air knife assembly 5 can block the composite air nozzle 3 from drying both ends of the electrode sheet, and use controllable airflow to specifically dry the thinned area 61, improving the consistency of the drying degree of the thinned area 61 with other areas of the electrode sheet 6. By adopting a delayed drying method, the quality of the electrode sheet is effectively improved. The inner octagonal air nozzle 4 is connected to the air nozzle interface 121 of the lower hull 2, and the inner octagonal air nozzle 4 is located below the air knife assembly 5. The air outlet of the inner octagonal air nozzle 4 has an inward converging V-shaped structure, which allows the blown hot air to concentrate and impact the lower end of the electrode sheet 6, forming a stable and pressure-controlled airflow field below the electrode sheet 6. This works in conjunction with the composite air nozzle 3 of the upper hull 1 and the air knife assembly 5 at the rear end to reduce airflow collision, improve drying uniformity, and delay drying of the thinned area 61, avoiding problems such as cracking caused by excessively rapid drying on both sides of the electrode sheet, thus effectively improving the drying quality of the electrode sheet.

[0036] Reference Figures 4 to 9In an embodiment of this utility model, both the composite nozzle 3 and the octagonal nozzle 4 include a nozzle connecting seat 341, a nozzle housing 342, a first mesh plate 343, and a sealing plate 344. The nozzle connecting seat 341 has a nozzle pin and a fastening plate on each side, which are used to connect to the oven hull. The fastening plate has a hook portion for easier connection. One end of the nozzle housing 342 has an air inlet 345. The nozzle connecting seat 341 is sealed to the air inlet 345, and the nozzle connecting seat 341 is also sealed to the nozzle interface 121, ensuring the air interface 121 is sealed. 1. Hot air is delivered into the nozzle without leakage. The first mesh plate 343 is connected to the inside of the nozzle housing 342, which helps to uniform airflow and allows the hot air to be distributed more evenly inside the nozzle, thereby improving the uniformity of drying. Both ends of the nozzle housing 342 are connected to the sealing plate 344, and the first mesh plate 343, the nozzle housing 342 and the two sealing plates 344 form a flow cavity 346. The flow cavity 346 is connected to the air inlet 345, so that the hot air has a stable flow space inside the nozzle, which helps to maintain the flow rate and direction of the hot air, thereby improving the drying efficiency and quality.

[0037] Specifically, the other end of the nozzle housing 342 is configured as an air outlet 347. The composite nozzle 3 also includes a first flow guiding component, which is connected to the air outlet 347. A first flow guiding component and the first mesh plate 343 form a first flow-dividing cavity 301. The flow cavity 346 is connected to the first flow-dividing cavity 301, so that the airflow entering from the flow cavity 346 can be further distributed and guided in the first flow-dividing cavity 301, thereby improving the uniformity and effect of drying.

[0038] Reference Figures 4 to 5In an embodiment of this utility model, the first flow guiding component includes a second perforated plate 31, a third perforated plate 32, and two flow dividers 33. The two sides of the second perforated plate 31 are fixedly connected to the nozzle housing 342 by rivets or welding. The third perforated plate 32 is connected to the outer end of the second perforated plate 31. The two flow dividers 33 are connected between the second perforated plate 31 and the third perforated plate 32. The second perforated plate 31, the third perforated plate 32, and the two flow dividers 33 enclose a central air outlet channel 34. The cross-section of the central air outlet channel is trapezoidal, gradually narrowing towards the air outlet end 347, providing better buoyancy and effectively preventing the electrode from shaking or shifting due to uneven airflow. The third perforated plate 32 and the two diverter plates 33 respectively enclose and form two first return air channels 35, which do not exhaust air, reduce convective heat transfer, and avoid curling and cracking caused by heat transfer from the rollers, as well as defects such as a significant reduction in air volume causing obvious dry and wet boundary lines. The two ends of the third perforated plate 32 respectively form first slit air outlet channels 36 with the inner wall of the nozzle shell 342. The middle air outlet channel 34 and the first slit air outlet channels 36 are both connected to the first diverter cavity 301. The sealing plate 344 of the composite nozzle 3 is provided with two first ventilation openings 302, which are connected to the first return air channels 35. The nozzle can provide buoyancy, and the overall buoyancy changes very little, reducing the risk of electrode shaking and scraping.

[0039] Specifically, the second perforated plate 31 includes a first air outlet section 311, a first diversion section 312, and a first fixing section 313. The first air outlet section 311 has the first diversion section 312 and the first fixing section 313 extending from both ends. The first fixing section 313 is fixedly connected to the nozzle housing 342 by bolts. The first air outlet section 311 has a first through hole 314 in the middle so that the airflow flows from the first diversion cavity 301 through the first through hole 314 to the middle air outlet channel 34. The first diversion section 312 has a second through hole 315 so that the airflow flows from the first diversion cavity 301 through the second through hole 315 to the first slit air outlet channel 36 and is then blown out, providing a suitable buoyancy force for the middle of the electrode sheet.

[0040] Specifically, the third perforated plate 32 includes a second air outlet section 321, a first bending section 322, and a first connecting section 323. Both ends of the second air outlet section 321 extend with the first bending section 322 and the first connecting section 323. The first connecting section 323 is connected to the end of the first air outlet section 311. A third through hole 324 is provided in the middle of the second air outlet section 321, and a fourth through hole 325 is provided at both ends of the second air outlet section 321. One end of the diverter plate 33 is connected to the first air outlet section 311, and the other end of the diverter plate 33 is connected between the third through hole 324 and the fourth through hole 325, so that airflow is blown out from the middle air outlet channel 34 through the third through hole 324, and airflow is blown out from the first return air channel 35 through the fourth through hole 325. In addition, the first bend section 322 makes the first slit air outlet channel 36 a bend, and the airflow speed slows down when passing through the bend. The faster the airflow speed, the faster the drying, which helps to prevent the slit air outlet channel from being over-dried.

[0041] Reference Figures 7 to 9 In an embodiment of this utility model, the inner eight-way nozzle 4 further includes a second flow guiding component. The second flow guiding component is connected to the air outlet 347. A second flow diversion cavity 401 is formed between the second flow guiding component and the first mesh plate 343. The flow cavity 346 is connected to the second flow diversion cavity 401 to ensure that hot air can flow smoothly inside the nozzle. Through this structural design, the inner eight-way nozzle 4 can more effectively guide and control the flow direction and distribution of hot air, further improving the drying effect and the operational stability of the equipment.

[0042] Specifically, the second airflow guiding component includes a fourth perforated plate 41 and a fifth perforated plate 42. The two sides of the fourth perforated plate 41 are connected to the nozzle housing 342 to ensure the overall stability of the structure. The fifth perforated plate 42 is connected to the outer end of the fourth perforated plate 41, and a second return air channel 43 is formed between the fifth perforated plate 42 and the fourth perforated plate 41. The ends of the fourth perforated plate 41 and the fifth perforated plate 42 respectively form a second slit air outlet channel 44 with the inner wall of the nozzle housing 342. The second slit air outlet channel 44 is connected to the second diversion cavity 401. Two second ventilation openings 402 are provided on the sealing plate 344 of the inner eight-nozzle 4. The second ventilation openings 402 are connected to the second return air channel 43, so that the airflow can flow smoothly inside the nozzle according to a preset path.

[0043] Specifically, the fourth mesh plate 41 includes a cavity section 411, a first positioning section 412, a second diversion section 413, and a second fixing section 414. Both ends of the cavity section 411 extend from the first positioning section 412, the second diversion section 413, and the second fixing section 414. The second fixing section 414 is fixedly connected to the nozzle housing 342. The second diversion section 413 is provided with a fifth through hole 415, allowing airflow to flow from the second diversion cavity 401 through the fifth through hole 415 to the second slit air outlet channel 44 and then be blown out. The fifth mesh... The plate 42 includes a third air outlet section 421, a second bending section 422, a second positioning section 423, and a second connecting section 424. The second bending section 422, the second positioning section 423, and the second connecting section 424 extend from both ends of the third air outlet section 421. The second positioning section 423 is in close contact with the first positioning section 412, and the second bending section 422 is located on the extension line of the second diversion section 413. The third air outlet section 421 is provided with a sixth through hole 425 so that airflow is blown out from the second return air channel 43 through the sixth through hole 425.

[0044] Reference Figure 3 , Figure 10 In an embodiment of this utility model, a mounting position 122 is provided at the rear end of the air nozzle interface 121 of the upper hull 1. The air knife assembly 5 is fixedly connected to the mounting position 122 to ensure the stability of the structural installation. The air knife assembly 5 includes an air inlet pipe 51, an air knife nozzle 52, a slide rail 53, a sliding bracket 54, and an L-shaped baffle 55. The slide rail 53 can be fixedly connected to the upper hull 1 by welding or snap-fit ​​connection to ensure that it can maintain good rigidity and straightness in high-temperature environment. The air knife nozzle 52 is slidably connected to the slide rail 53 through the sliding bracket 54 to facilitate quick adaptation to the drying requirements of different specifications of electrode sheets. One end of the L-shaped baffle 55 is connected to one side of the air knife nozzle 52, and the other end of the L-shaped baffle 55 is set between the composite air nozzle 3 and the electrode sheet 6 to prevent the hot air from the composite air nozzle 3 from directly impacting the electrode sheet thinning area 61, and to avoid the coating cracking in this area due to excessive drying.

[0045] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An oven, characterized in that: The device includes an upper hull, a lower hull, and multiple composite air nozzles, inward-pointing air nozzles, and air knife assemblies. The upper and lower hulls are arranged vertically opposite each other, and multiple air nozzle interfaces are spaced apart on both the upper and lower hulls. The composite air nozzles are connected to the air nozzle interfaces on the upper hull. The air knife assembly is mounted on the upper hull and is located at the rear end of the composite air nozzles. The air knife assembly is used for delayed drying of the thinned areas on both sides of the electrode sheet. The inward-pointing air nozzles are connected to the air nozzle interfaces on the lower hull and are located below the air knife assembly. The composite air nozzles are used to dry the upper end of the electrode sheet, and the inward-pointing air nozzles are used to dry the lower end of the electrode sheet.

2. The drying oven according to claim 1, characterized in that: Both the composite nozzle and the inward-facing nozzle include a nozzle connector, a nozzle housing, a first perforated plate, and a sealing plate. One end of the nozzle housing is provided with an air inlet, and the other end of the nozzle housing is provided with an air outlet. The nozzle connector is connected to the air inlet and the nozzle connector is connected to the nozzle interface. The first perforated plate is connected inside the nozzle housing. Both ends of the nozzle housing are connected to the sealing plate. The first perforated plate, the nozzle housing, and the two sealing plates enclose a flow cavity, which communicates with the air inlet.

3. The drying oven according to claim 2, characterized in that: The composite nozzle also includes a first flow guiding component, which is connected to the air outlet end. A first flow diversion cavity is formed between the first flow guiding component and the first mesh plate, and the flow cavity is connected to the first flow diversion cavity.

4. The drying oven according to claim 3, characterized in that: The first airflow guiding component includes a second perforated plate, a third perforated plate, and two diverter plates. The two sides of the second perforated plate are connected to the nozzle housing. The third perforated plate is connected to the outer side of the second perforated plate. The two diverter plates are connected between the second and third perforated plates. The second, third, and two diverter plates together form a central air outlet channel. The third perforated plate and the two diverter plates together form two first return air channels. The two ends of the third perforated plate are connected to the inner wall of the nozzle housing to form first slit air outlet channels. The central air outlet channel and the first slit air outlet channels are both connected to the first diverter cavity. The sealing plate of the composite nozzle is provided with two first ventilation openings, which are connected to the first return air channels.

5. The drying oven according to claim 4, characterized in that: The second perforated plate includes a first air outlet section, a first diversion section, and a first fixed section. Both ends of the first air outlet section have the first diversion section and the first fixed section. The first fixed section is fixedly connected to the nozzle housing. A first through hole is provided in the middle of the first air outlet section so that airflow flows from the first diversion cavity through the first through hole to the middle air outlet channel. A second through hole is provided in the first diversion section so that airflow flows from the first diversion cavity through the second through hole to the first slit air outlet channel and is then blown out.

6. The drying oven according to claim 5, characterized in that: The third perforated plate includes a second air outlet section, a first bending section, and a first connecting section. Both ends of the second air outlet section have the first bending section and the first connecting section. The first connecting section is connected to the end of the first air outlet section. A third through hole is provided in the middle of the second air outlet section, and a fourth through hole is provided at both ends of the second air outlet section. One end of the diverter plate is connected to the first air outlet section, and the other end of the diverter plate is connected between the third through hole and the fourth through hole, so that airflow is blown out from the middle air outlet channel through the third through hole, and airflow is blown out from the first return air channel through the fourth through hole.

7. The drying oven according to claim 3, characterized in that: The inward-facing nozzle also includes a second flow guiding component, which is connected to the air outlet end. A second flow diversion cavity is formed between the second flow guiding component and the first mesh plate, and the flow cavity is connected to the second flow diversion cavity.

8. The drying oven according to claim 7, characterized in that: The second airflow guiding assembly includes a fourth mesh plate and a fifth mesh plate. The two sides of the fourth mesh plate are connected to the nozzle housing. The fifth mesh plate is connected to the outer end of the fourth mesh plate, and a second return air channel is formed between the fifth mesh plate and the fourth mesh plate. The two ends of the fourth and fifth mesh plates respectively form a second slit air outlet channel with the inner wall of the nozzle housing. The second slit air outlet channels are all connected to the second diversion cavity. The sealing plate of the inner eight-nozzle is provided with two second ventilation openings, which are connected to the second return air channel.

9. An oven according to claim 8, characterized in that: The fourth perforated plate includes a cavity section, a first positioning section, a second diversion section, and a second fixing section. Both ends of the cavity section extend to form the first positioning section, the second diversion section, and the second fixing section. The second fixing section is fixedly connected to the nozzle housing. The second diversion section is provided with a fifth through hole, allowing airflow to flow from the second diversion cavity through the fifth through hole to the second slit air outlet channel and then be blown out. The fifth perforated plate includes a third air outlet section, a second bending section, a second positioning section, and a second first connecting section. Both ends of the third air outlet section extend to form the second bending section, the second positioning section, and the second connecting section. The second positioning section is in close contact with the first positioning section, and the second bending section is located on the extension line of the second diversion section. The third air outlet section is provided with a sixth through hole, allowing airflow to be blown out from the second return channel through the sixth through hole.

10. An oven according to claim 1, characterized in that: The rear end of the air nozzle interface of the upper hull is provided with an installation position. The air knife assembly is fixedly connected to the installation position. The air knife assembly includes an air inlet pipe, an air knife nozzle, a slide rail, a sliding bracket, and an L-shaped baffle. The slide rail is fixedly connected to the upper hull. The air knife nozzle is slidably connected to the slide rail through the sliding bracket. One end of the L-shaped baffle is connected to one side of the air knife nozzle, and the other end of the L-shaped baffle is disposed between the composite air nozzle and the electrode.

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