A drying device and coating equipment

Abstract

The utility model relates to the technical field of battery manufacturing, and in particular to a drying device and coating equipment. The drying device includes at least two oven units spliced ​​in sequence along the conveying direction of the pole piece, each oven unit includes a box body and a blowing assembly arranged in the box body, the blowing assembly includes two rows of staggered air nozzles; an air nozzle located at the edge of the blowing assembly protrudes from the corresponding box body and is inserted into the adjacent box body. In the drying device provided by the present application, since an air nozzle is provided at the splicing position of two adjacent boxes, the pole piece can stably pass through the splicing position of the two boxes, thereby alleviating the problem of unstable suspension state of the pole piece when passing through the splicing position of the two boxes, avoiding problems such as uneven coating thickness, poor coating quality, and air nozzle scraping caused by the shaking of the pole piece, and improving the drying effect of the pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a drying device and a coating device. Background Art

[0002] In the process of battery manufacturing, it is necessary to coat the electrode plate. Electrode plate coating is a process of coating wet slurry on the upper and lower surfaces of the foil to form a coated electrode plate, and the wet coated electrode plate needs to be dried into a dry coated electrode plate through an oven line.

[0003] The oven line is generally composed of multiple sections of ovens connected in series, and there are two rows of air nozzles arranged up and down in each oven for blowing air towards the electrode plate to dry the electrode plate. Currently, the two rows of air nozzles are usually arranged in a staggered "pin" shape, and no air nozzles are provided at the splicing position of two sections of ovens.

[0004] Due to the lack of an air nozzle at the splicing position of two sections of ovens, the suspension state of the electrode plate is unstable when passing through the splicing position of the two sections of ovens, resulting in easy shaking of the electrode plate, and further causing problems such as uneven coating thickness, poor coating quality, and scraping of the air nozzle, affecting the drying effect of the electrode plate. Content of the Utility Model

[0005] The first object of the utility model is to provide a drying device to solve the technical problem that the suspension state of the electrode plate is unstable when passing through the splicing position of two sections of ovens in the prior art, affecting the drying effect of the electrode plate.

[0006] In order to achieve the above object, the utility model adopts the following technical solutions:

[0007] A drying device includes at least two oven units spliced in sequence along the electrode plate conveying direction, each oven unit includes a box body and a blowing component arranged in the box body, and the blowing component includes air nozzles arranged in two rows up and down in a staggered manner;

[0008] One air nozzle located at the edge in each group of blowing components protrudes from the corresponding box body and inserts into the adjacent box body.

[0009] Furthermore, a first connecting rod extending along the electrode plate conveying direction is arranged in each box body, and the air nozzles located in the upper row or the lower row are sequentially connected to the first connecting rod;

[0010] Among two arbitrarily adjacent box bodies, one end of the first connecting rod in one box body extends out of the corresponding box body and extends into the other box body.

[0011] Furthermore, the first connecting rod has a first end and a second end arranged oppositely along the electrode plate conveying direction, and a limiting structure is arranged at the second end of the first connecting rod;

[0012] Among any two adjacent first connecting rods along the pole piece conveying direction, the first end of one of the first connecting rods and the second end of the other first connecting rod are aligningly connected via the limiting structure.

[0013] Furthermore, the limiting structure includes a first limiting plate and a second limiting plate, wherein:

[0014] One end of the first limiting plate is installed on the side of the first connecting rod close to the blowing assembly, and the other end of the first limiting plate extends in a direction away from the first end of the first connecting rod and protrudes through the first connecting rod;

[0015] One end of the second limit plate is mounted on an end surface of the first connecting rod along the vertical direction, and the other end of the second limit plate extends in a direction away from the first end of the second limit plate and protrudes through the second limit plate.

[0016] Furthermore, one end of the first limiting plate that extends through the first connecting rod is provided with a first inclined surface;

[0017] One end of the second limiting plate that extends through the first connecting rod is provided with a second inclined surface.

[0018] Furthermore, one first connecting rod is respectively provided on two opposite sides of the blowing assembly along the width direction of the pole piece, and both ends of the air nozzles located in the upper row or the air nozzles located in the lower row are respectively connected to two first connecting rods.

[0019] Furthermore, each of the oven units further comprises two air chambers for supplying air to the upper and lower rows of air nozzles respectively; each of the air chambers comprises a first air supply portion and a second air supply portion, and the first air supply portion and the second air supply portion are respectively arranged on opposite sides of the blowing assembly along the width direction of the pole piece;

[0020] Among the air nozzles located in the upper row or the air nozzles located in the lower row, the air inlets of a part of the air nozzles are connected to the first air supply part, and the air inlets of another part of the air nozzles are connected to the second air supply part.

[0021] Furthermore, the air nozzles connected to the first air supply part and the air nozzles connected to the second air supply part are alternately distributed.

[0022] Furthermore, each of the air chambers also includes a connecting portion connected between the first air supply portion and the second air supply portion.

[0023] The second object of the utility model is to provide a coating device, comprising any one of the drying devices described above.

[0024] Beneficial effects of the utility model:

[0025] The utility model provides a drying device and a coating device, wherein the drying device comprises at least two oven units which are sequentially spliced ​​along the electrode conveying direction, each oven unit comprises a box body and a blowing assembly arranged in the box body, the blowing assembly comprises air nozzles which are staggeredly distributed in two rows, upper and lower rows; an air nozzle located at the edge of the blowing assembly protrudes from the corresponding box body and is inserted into the adjacent box body.

[0026] In the drying device provided in the present application, since an air nozzle is provided at the joint position of the two boxes, the electrode can stably pass through the joint position of the two boxes, thereby alleviating the problem of unstable suspension state of the electrode when passing through the joint position of the two boxes, avoiding problems such as uneven coating thickness, poor coating quality, and air nozzle scraping due to shaking of the electrode, and improving the drying effect of the electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A cross-sectional schematic diagram of a drying device provided in an embodiment of the utility model;

[0029] Figure 2 for Figure 1 A magnified view at point A;

[0030] Figure 3 A schematic diagram of the internal structure of the oven unit provided in an embodiment of the utility model;

[0031] Figure 4 A schematic diagram of the structure of the first end of the first connecting rod provided in an embodiment of the utility model;

[0032] Figure 5 A schematic diagram of the structure of the second end of the first connecting rod provided in an embodiment of the utility model;

[0033] Figure 6 for Figure 5 Enlarged view at B;

[0034] Figure 7 A schematic diagram of a docking process of adjacent first connecting rods provided in an embodiment of the utility model;

[0035] Figure 8 A schematic diagram of the internal structure of a drying device provided in an embodiment of the utility model;

[0036] Fig. 9 A schematic diagram of the structure of the air chamber provided by an embodiment of the utility model;

[0037] Fig.10 A schematic diagram of the connection between the air chamber and the corresponding air nozzle air supply member provided in an embodiment of the utility model.

[0038] icon:

[0039] 1-oven unit; 11-box body; 111-first connecting rod; 112-limiting structure; 1121-first limiting plate; 11211-first inclined plane; 1122-second limiting plate; 11221-second inclined plane; 12-blowing assembly; 121-nozzle; 122-nozzle air supply member; 123-wind chamber; 1231-first air supply part; 1232-second air supply part; 1233-connecting part; 1234-inlet; 1235-outlet. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The first embodiment of the utility model provides a drying device, referring to Figure 1 and Figure 2, the device includes at least two oven units 1 spliced in sequence along the conveying direction of the pole piece. Each oven unit 1 includes a box body 11 and a blowing component 12 arranged in the box body 11. The blowing component 12 includes air nozzles 121 distributed in a staggered manner in two upper and lower rows;

[0044] One air nozzle 121 at the edge in the blowing component 12 protrudes from the corresponding box body 11 and is inserted into the adjacent box body 11.

[0045] In the drying device provided in this application, on the relative two sides of one air nozzle 121 at the edge in the blowing component 12 are respectively arranged in two adjacent box bodies 11. As Figure 2 shown, on the relative two sides of the air nozzle 121 at the middle position of the lower row in the figure are respectively arranged in two adjacent box bodies 11. This air nozzle 121 fills the vacant position at the splicing place of two adjacent box bodies 11, so that a group of upper and lower rows of air nozzles in the drying device are evenly and staggeredly arranged in a "pin" shape. Since there is an air nozzle 121 at the splicing position of two box bodies 11, the pole piece can stably pass through the splicing position of two box bodies 11, thereby alleviating the problem that the suspension state of the pole piece is unstable when passing through the splicing position of two box bodies 11, and avoiding problems such as uneven coating thickness, poor coating quality, and air nozzle scraping due to the shaking of the pole piece, and improving the drying effect of the pole piece.

[0046] It should be noted that the air nozzle 121 protruding from the corresponding box body 11 can be located in the upper row or the lower row, and there is no limitation here. Figure 2 In the illustrated embodiment, the air nozzle 121 protruding from the corresponding box body 11 is specifically located in the lower row.

[0047] It should also be noted that in the oven unit 1 at the end, the blowing component 12 is all located in the box body 11, and there is no air nozzle 121 protruding from the box body 11.

[0048] Referring to Figure 3 , in this embodiment, each oven unit 1 includes two groups of blowing components 12; the two groups of blowing components 12 are distributed up and down in the box body 11; one air nozzle 121 at the edge in each group of blowing components 12 protrudes from the corresponding box body 11 and is inserted into the adjacent box body 11.

[0049] During operation, the two groups of blowing components 12 can respectively perform drying treatment on two pole pieces at the same time. Optionally, the two groups of blowing components 12 can simultaneously perform drying treatment on two pole pieces of the same polarity, or can perform drying treatment on the positive and negative pole pieces at the same time, thereby improving the drying efficiency of the pole piece.

[0050] Referring to Figure 4, a first connecting rod 111 extending along the electrode sheet conveying direction is arranged in each box 11, and the air nozzles 121 located in the upper row or the air nozzles 121 located in the lower row are sequentially connected to the first connecting rod 111;

[0051] In any two adjacent boxes 11 , one end of the first connecting rod 111 in one of the boxes 11 extends from the corresponding box 11 and extends into the other box 11 .

[0052] In the above structure, the air nozzle 121 in the blowing assembly 12 protruding from the corresponding box body 11 (the air nozzle 121 can be an upper exhaust nozzle or a lower exhaust nozzle) is installed on the first connecting rod 111, and the air nozzle 121 at the splicing position of two adjacent boxes 11 can be fixed through the first connecting rod 111.

[0053] Furthermore, the blowing assembly 12 is provided with a first connecting rod 111 on opposite sides along the width direction of the pole piece, and the two ends of the air nozzles 121 in the upper row or the air nozzles 121 in the lower row are respectively connected to the two first connecting rods 111. The two first connecting rods 111 can limit the opposite ends of the upper exhaust nozzle or the lower exhaust nozzle, thereby improving the installation strength of the air nozzle 121.

[0054] In this embodiment, in each group of blowing components 12, an air nozzle 121 located at the edge of the lower air exhaust nozzle protrudes from the corresponding box body 11 and is inserted into the adjacent box body 11, and a first connecting rod 111 is provided on the opposite sides of the lower air exhaust nozzle, and each air nozzle 121 in the lower air exhaust nozzle is connected between the two first connecting rods 111; at the same time, the upper air exhaust nozzle is located as a whole in the box body 11, and a second connecting rod is provided on the opposite sides of the upper air exhaust nozzle, and the second connecting rod is located as a whole in the box body 11, and each air nozzle 121 in the upper air exhaust nozzle is connected between the two second connecting rods.

[0055] Reference Figure 4 and Figure 5 The first connecting rod 111 has a first end and a second end which are arranged opposite to each other along the pole piece conveying direction, and a limiting structure 112 is arranged at the second end of the first connecting rod 111;

[0056] Among two arbitrarily adjacent first connecting rods 111 along the electrode sheet conveying direction, the first end of one of the first connecting rods 111 and the second end of the other first connecting rod 111 are aligningly connected via a limiting structure 112 .

[0057] Figure 4 The illustrated embodiment is a schematic structural diagram of the first end of the first connecting rod 111. Figure 5 The embodiment shown is a schematic diagram of the structure of the second end of the first connecting rod 111. Figure 4 and Figure 5In two arbitrary adjacent boxes 11 , the first end of the first connecting rod 111 in one of the boxes 11 extends from the corresponding box 11 and extends into the other box 11 , and is aligned and connected to the second end of the first connecting rod 111 in the other box 11 through a limiting structure 112 .

[0058] Reference Figure 6 and Figure 7 The limiting structure 112 includes a first limiting plate 1121 and a second limiting plate 1122, wherein:

[0059] One end of the first limiting plate 1121 is installed on the side of the first connecting rod 111 close to the blowing assembly 12, and the other end of the first limiting plate 1121 extends in a direction away from the first end of the first connecting rod 111 and protrudes through the first connecting rod 111;

[0060] One end of the second limiting plate 1122 is mounted on an end surface of the first connecting rod 111 along the vertical direction, and the other end of the second limiting plate 1122 extends in a direction away from the first end of the second limiting plate 1122 and protrudes through the second limiting plate 1122 .

[0061] In this embodiment, one end of the second limiting plate 1122 is installed on the upper end surface of the first connecting rod 111; after the two first connecting rods 111 are connected, the two ends of the first limiting plate 1121 respectively abut against the side surfaces of the two first connecting rods 111 close to the blowing assembly 12, and the two ends of the second limiting plate 1122 respectively abut against the upper end surfaces of the two first connecting rods 111. The first limiting plate 1121 and the second limiting plate 1122 can realize the centering of the two first connecting rods 111, so that the air nozzles 121 at the splicing position of the two boxes 11 can be on the same horizontal line with the adjacent air nozzles 121.

[0062] Reference Figure 7 , one end of the first limiting plate 1121 that extends through the first connecting rod 111 is provided with a first inclined surface 11211;

[0063] One end of the second limiting plate 1122 that extends through the first connecting rod 111 is provided with a second inclined surface 11221 .

[0064] During the docking of the two first connecting rods 111 , the first end of one of the first connecting rods 111 can adjust its angle along the first inclined surface 11211 and the second inclined surface 11221 so as to be aligned with the second end of the other first connecting rod 111 .

[0065] In this embodiment, the first limiting plate 1121 and the second limiting plate 1122 are both detachably mounted on the first connecting rod 111 by fasteners such as bolts.

[0066] Reference Figure 8 and Fig. 9 Each oven unit 1 further includes two air chambers 123 for supplying air to the upper and lower rows of air nozzles 121; each air chamber 123 includes a first air supply portion 1231 and a second air supply portion 1232, and the first air supply portion 1231 and the second air supply portion 1232 are respectively arranged on opposite sides of the electrode sheet in the width direction;

[0067] Among the air nozzles 121 located in the upper row or the air nozzles 121 located in the lower row, the air inlets of some of the air nozzles 121 are connected to the first air supply portion 1231 , and the air inlets of other part of the air nozzles 121 are connected to the second air supply portion 1232 .

[0068] Take the connection structure of the above row of air nozzles 121 and air chambers 123 as an example. Fig. 9 Among the air nozzles 121 in the upper row, the air inlets of some of the air nozzles 121 are connected to the first air supply portion 1231, and the air inlets of the other air nozzles 121 are connected to the second air supply portion 1232. This arrangement enables the air blown out of each area of ​​the air nozzles 121 in the upper row to be relatively uniform, thereby improving the stability of the pole piece suspension. The connection structure of the air nozzles 121 and the air chamber 123 in the lower row is the same as described above, and will not be repeated here.

[0069] In this embodiment, among the wind nozzles 121 in the upper row or among the wind nozzles 121 in the lower row, the wind nozzles 121 connected to the first air supply portion 1231 and the wind nozzles 121 connected to the second air supply portion 1232 are alternately distributed, so that the upper exhaust nozzles or the lower exhaust nozzles can provide relatively uniform wind force to each area of ​​the pole piece.

[0070] Continue to refer to Fig. 9 Each air chamber 123 further includes a connecting portion 1233 connected between the first air supply portion 1231 and the second air supply portion 1232. The connecting portion 1233 enables air to flow between the first air supply portion 1231 and the second air supply portion 1232, so that the first air supply portion 1231 and the second air supply portion 1232 can be connected to the same air source.

[0071] Furthermore, the blowing assembly 12 further includes a plurality of nozzle air supply members 122, which are arranged one by one with the nozzles 121; each nozzle air supply member 122 is a tubular structure, which has an air inlet end and a closed end arranged oppositely along the length direction, wherein the air inlet end of the nozzle air inlet member 122 is provided with an air inlet connected to the corresponding air chamber 123; the side wall of the nozzle air inlet member 122 facing the pole piece is provided with an air outlet connected to the corresponding air nozzle 121. The nozzle air inlet member 122 is connected between the corresponding air chamber 123 and the nozzle 121, and is used to transfer the wind in the air chamber 123 to the nozzle 121.

[0072] Since the wind enters from the air inlet end of the air nozzle inlet piece 122, the wind pressure inside the air nozzle inlet piece 122 tends to decrease from the air inlet end to the closed end, causing the wind pressure at the air outlet of the air nozzle inlet piece 122 to also tend to decrease from the air inlet end to the closed end, thereby causing uneven wind pressure at various locations of the air outlet of the air nozzle 121.

[0073] Reference Fig.10 In this embodiment, the nozzle air supply members 122 located in the upper row or the nozzle air supply members 122 located in the lower row, the nozzle air supply members 122 connected to the first air supply portion 1231 and the nozzle air supply members 122 connected to the second air supply portion 1232 are alternately distributed, so that the blowing assembly 12 can provide relatively uniform wind pressure to both sides of the pole piece, avoiding the problem of easy shaking of the pole piece due to the high wind pressure on one side of the pole piece, thereby improving the coating quality of the pole piece.

[0074] Continue to refer to Fig.10 The first air supply part 1231 of each air chamber 123 is provided with an inlet 1234 and an outlet 1235, wherein the wind enters the first air supply part 1231 from the inlet 1234, and enters the second air supply part 1232 through the connecting part 1233; the wind in each air chamber 123 is blown toward the surface of the electrode through the corresponding air nozzle air supply member 122 and the air nozzle 121 in turn, so as to dry the electrode; the wind in the air chamber 123 can be discharged through the outlet 1235, so as to form a circulating wind flow in the air chamber 123. In the process of drying the electrode, the first air supply part 1231 and the second air supply part 1232 can provide relatively uniform wind pressure on both sides of the electrode, so as to avoid the phenomenon that the suspension of the electrode is unstable due to the high wind pressure on one side of the electrode, thereby improving the suspension effect and coating quality of the electrode.

[0075] In summary, in the drying device provided by the present application, by arranging the air nozzle 121 at the splicing position of two arbitrary adjacent boxes 11, the phenomenon that the electrode piece is easy to shake when passing through the splicing position of the two boxes 11 is alleviated; at the same time, the first air supply part 1231 and the second air supply part 1232 are used to provide relatively uniform wind pressure to both sides of the electrode piece, thereby avoiding the problem of easy shaking of the electrode piece due to the high wind pressure on one side of the electrode piece; since the electrode piece is in a stably suspended state during the drying process, the drying effect and coating quality of the electrode piece are greatly improved.

[0076] The second embodiment of the utility model provides a coating device, which includes any of the above-mentioned drying devices. The coating device at least has the technical effects of the drying device provided in any of the above-mentioned embodiments, which will not be described in detail here.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A drying device, characterized in that: The invention comprises at least two oven units (1) which are sequentially spliced ​​along the electrode sheet conveying direction, each of the oven units (1) comprising a box body (11) and a blowing assembly (12) arranged in the box body (11), and the blowing assembly (12) comprises air nozzles (121) which are staggeredly distributed in two upper and lower rows; One of the air nozzles (121) located at the edge of the blowing assembly (12) protrudes from the corresponding box (11) and is inserted into the adjacent box (11).

2. The drying device according to claim 1, characterized in that: A first connecting rod (111) extending along the electrode sheet conveying direction is arranged in each of the boxes (11), and the air nozzles (121) located in the upper row or the air nozzles (121) located in the lower row are sequentially connected to the first connecting rod (111); In any two adjacent boxes (11), one end of the first connecting rod (111) in one of the boxes (11) extends from the corresponding box (11) and extends into the other box (11).

3. The drying device according to claim 2, characterized in that: The first connecting rod (111) has a first end and a second end which are arranged opposite to each other along the pole piece conveying direction, and a limiting structure (112) is arranged on the second end of the first connecting rod (111); Among two arbitrarily adjacent first connecting rods (111) along the pole piece conveying direction, the first end of one of the first connecting rods (111) and the second end of the other of the first connecting rods (111) are connected in position via the limiting structure (112).

4. The drying device according to claim 3, characterized in that: The limiting structure (112) comprises a first limiting plate (1121) and a second limiting plate (1122), wherein: One end of the first limiting plate (1121) is mounted on a side of the first connecting rod (111) close to the blowing assembly (12), and the other end of the first limiting plate (1121) extends in a direction away from the first end of the first connecting rod (111) and protrudes through the first connecting rod (111); One end of the second limiting plate (1122) is mounted on an end surface of the first connecting rod (111) along the vertical direction, and the other end of the second limiting plate (1122) extends in a direction away from the first end of the second limiting plate (1122) and protrudes through the second limiting plate (1122).

5. The drying device according to claim 4, characterized in that: One end of the first limiting plate (1121) extending through the first connecting rod (111) is provided with a first inclined surface (11211); One end of the second limiting plate (1122) that extends through the first connecting rod (111) is provided with a second inclined surface (11221).

6. The drying device according to claim 2, characterized in that: The blowing assembly (12) is provided with a first connecting rod (111) on opposite sides along the width direction of the pole piece, respectively, and the two ends of the air nozzle (121) located in the upper row or the air nozzle (121) located in the lower row are respectively connected to the two first connecting rods (111).

7. The drying device according to claim 1, characterized in that: The blowing assembly (12) further comprises two air chambers (123) respectively used for supplying air to the upper and lower rows of air nozzles (121); each of the air chambers (123) comprises a first air supply portion (1231) and a second air supply portion (1232), and the first air supply portion (1231) and the second air supply portion (1232) are respectively arranged on opposite sides in the width direction of the pole piece; In the air nozzles (121) located in the upper row or in the air nozzles (121) located in the lower row, the air inlets of a portion of the air nozzles (121) are connected to the first air supply portion (1231), and the air inlets of another portion of the air nozzles (121) are connected to the second air supply portion (1232).

8. The drying device according to claim 7, characterized in that: Among the air nozzles (121) located in the upper row or among the air nozzles (121) located in the lower row, the air nozzles (121) connected to the first air supply portion (1231) and the air nozzles (121) connected to the second air supply portion (1232) are alternately distributed.

9. The drying device according to claim 7, characterized in that: Each of the air chambers (123) further comprises a connecting portion (1233) connected between the first air supply portion (1231) and the second air supply portion (1232).

10. A coating device, characterized in that: It comprises a drying device as claimed in any one of claims 1 to 9.

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