Air floating roller assembly and coating equipment

Abstract

The utility model discloses an air floating roller assembly and coating equipment. The air floating roller assembly comprises a base and a plurality of roller groups, the plurality of roller sets are horizontally arranged on the base at intervals, each roller set comprises an air floating roller, a tape passing gap is formed between every two adjacent air floating rollers, a pole piece penetrates through the tape passing gaps to be wound on the plurality of roller sets so as to form a U-shaped groove or an inverted U-shaped bulge, and the air floating rollers are suitable for generating airflow blowing to the pole piece so as to fix the pole piece; according to the air floating roller assembly, the pole pieces are wound on the roller sets, and U-shaped grooves or inverted-U-shaped protrusions are formed in the middle sections of the pole pieces, so that the pole pieces are stabilized, stable conveying of the pole pieces on the air floating roller assembly is guaranteed, shaking or deviation of the pole pieces in the tape conveying process is avoided, and the coating quality of the pole pieces is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery coating equipment, in particular to an air floating roller assembly and coating equipment. Background Art

[0002] In the current lithium battery industry battery production process, coating is an extremely important process in the front-end process. The quality of coating is directly related to the quality and life of lithium-ion batteries. The pole piece is an important component of the lithium battery. It is the positive and negative electrode of the lithium battery. Usually, the upper and lower surfaces of the pole piece are coated with slurry.

[0003] When conveying the coated electrode, an air flotation roller is used for conveying. The air flotation roller is a non-contact roller with air outlet holes on the outer periphery of the roller body. The airflow blows up the electrode from the air outlet holes, and the air flotation force formed by the airflow lifts up the electrode. When the electrode moves under the traction force, it will balance the blowing force of the airflow, realizing the non-contact movement of the electrode suspension.

[0004] The air floating roller assembly in the prior art is usually composed of multiple rollers in parallel. The gas blown out from the surface of the roller supports the pole piece to move along the belt. The pole piece is prone to shaking or shifting during the movement, which can easily cause scratches on the pole piece and affect the quality of the battery. Utility Model Content

[0005] Therefore, the purpose of the utility model is to provide an air flotation roller assembly and a coating device to solve the shaking or deviation caused by unstable airflow during the electrode tape conveying process in the prior art, thereby improving the quality of battery production.

[0006] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0007] An air flotation roller assembly comprises: a base and a plurality of roller groups; the plurality of roller groups are all arranged on the base, the plurality of roller groups are horizontally spaced and distributed, the roller group comprises an air flotation roller, a belt running gap is provided between two adjacent air flotation rollers, a pole piece is passed through the belt running gap to be wound around the plurality of roller groups to form a U-shaped groove or an inverted U-shaped protrusion in the middle section, and the air flotation roller is suitable for generating an air flow to blow toward the pole piece to fix the pole piece.

[0008] According to some embodiments of the present utility model, the roller group includes a fixing frame, both ends of the fixing frame are provided with fixing ear plates, and the air floating roller is mounted on the fixing ear plates.

[0009] According to some embodiments of the utility model, the air flotation roller is provided with a cavity, and one end of the air flotation roller is provided with a rotary joint communicating with the cavity.

[0010] According to some embodiments of the utility model, the multiple roller groups include a first roller group, a second roller group and a third roller group which are horizontally spaced in sequence on the base, the first roller group includes a first air floating roller, the second roller group includes a second air floating roller, and the third roller group includes a third air floating roller. A first tape running gap is formed between the first air floating roller and the second air floating roller, and a second tape running gap is formed between the second air floating roller and the third air floating roller. The pole piece passes through the first tape running gap from the top of the first air floating roller and goes around the bottom of the second air floating roller, then passes through the second tape running gap and goes around the top of the third air floating roller to form the U-shaped groove at the second air floating roller.

[0011] According to some embodiments of the utility model, a plurality of rows of first air outlet holes are arranged on the top of the first air floatation roller and on a side close to the second air floatation roller, a first cavity is arranged inside the first air floatation roller, and the first air outlet holes are connected to the first cavity;

[0012] A plurality of rows of second air outlet holes are provided at the bottom of the second air flotation roller, a second cavity is provided inside the second air flotation roller, and the plurality of second air outlet holes are connected to the second cavity;

[0013] A plurality of rows of third air outlet holes are arranged on the top of the third air floatation roller and on a side close to the second air floatation roller. A third cavity is arranged inside the third air floatation roller, and the third air outlet holes are communicated with the third cavity.

[0014] According to some embodiments of the present invention, the plurality of rows of the first air outlet holes are arranged in a clockwise manner from the top to the side close to the second air floatation roller along the circumference of the first air floatation roller, and the distribution surface where the plurality of rows of the first air outlet holes are located is 1 / 4 of the roller surface of the first air floatation roller;

[0015] The plurality of rows of the second air outlet holes are arranged counterclockwise from a side close to the first air floatation roller to a side close to the third air floatation roller along the circumference of the second air floatation roller, and the distribution surface of the plurality of rows of the second air outlet holes is 1 / 2 of the roller surface of the second air floatation roller;

[0016] The plurality of rows of third air outlet holes are arranged counterclockwise from the top to the side close to the second air floatation roller along the circumference of the third air floatation roller, and the distribution surface of the plurality of rows of third air outlet holes is 1 / 4 of the roller surface of the first air floatation roller.

[0017] According to some embodiments of the utility model, the multiple roller groups include a first roller group, a second roller group and a third roller group which are horizontally spaced in sequence on the base, the first roller group includes a first air floating roller, the second roller group includes a second air floating roller, and the third roller group includes a third air floating roller. A first tape running gap is formed between the first air floating roller and the second air floating roller, and a second tape running gap is formed between the second air floating roller and the third air floating roller. The pole piece passes through the first tape running gap from the bottom of the first air floating roller and goes around the top of the second air floating roller, then passes through the second tape running gap and goes around the bottom of the third air floating roller to form the inverted U-shaped protrusion at the second air floating roller.

[0018] According to some embodiments of the utility model, a plurality of rows of first air outlet holes are arranged at the bottom of the first air floatation roller and at a side close to the second air floatation roller, a first cavity is arranged inside the first air floatation roller, and the first air outlet holes are connected to the first cavity;

[0019] A plurality of rows of second air outlet holes are provided on the top of the second air flotation roller, a second cavity is provided inside the second air flotation roller, and the plurality of second air outlet holes are connected to the second cavity;

[0020] A plurality of rows of third air outlet holes are arranged at the bottom of the third air floatation roller and at a side close to the second air floatation roller. A third cavity is arranged inside the third air floatation roller, and the third air outlet holes are communicated with the third cavity.

[0021] According to some embodiments of the present invention, the plurality of rows of the first air outlet holes are arranged counterclockwise from the bottom to the side close to the second air floatation roller along the circumference of the first air floatation roller, and the distribution surface of the plurality of rows of the first air outlet holes is 1 / 4 of the roller surface of the first air floatation roller;

[0022] The plurality of rows of the second air outlet holes are arranged in a clockwise manner from a side close to the first air floatation roller to a side close to the third air floatation roller along the circumference of the second air floatation roller, and the distribution surface of the plurality of rows of the second air outlet holes is 1 / 2 of the roller surface of the second air floatation roller;

[0023] The plurality of rows of third air outlet holes are arranged in a clockwise manner from the bottom to the side close to the second air floatation roller along the circumference of the third air floatation roller, and the distribution surface of the plurality of rows of third air outlet holes is 1 / 4 of the roller surface of the first air floatation roller.

[0024] The utility model also provides a coating device, which comprises the air floating roller assembly.

[0025] The technical solution of the utility model has the following advantages:

[0026] The utility model provides an air flotation roller assembly, wherein a plurality of roller groups are horizontally arranged at intervals on a base, the roller group comprises an air flotation roller, a belt running gap is provided between two adjacent air flotation rollers, a pole piece is passed through the belt running gap to be wound on a plurality of roller groups to form a U-shaped groove or an inverted U-shaped protrusion, the air flotation roller is suitable for generating an air flow blowing toward the pole piece to fix the pole piece; the pole piece is wound on a plurality of roller groups and a U-shaped groove or an inverted U-shaped protrusion is formed in the middle section, so as to stabilize the pole piece, thereby ensuring that the pole piece is smoothly transported on the air flotation roller assembly, avoiding shaking or deviation of the pole piece during belt running, and thus improving the coating quality of the pole piece. 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 It is a structural schematic diagram of the air flotation roller assembly provided in the first embodiment of the utility model;

[0029] Figure 2 It is a structural schematic diagram of the air flotation roller assembly provided in the second embodiment of the utility model;

[0030] Figure 3 It is a structural schematic diagram of the first roller group provided in the embodiment of the utility model;

[0031] Figure 4 It is a schematic structural diagram of the third roller group provided in the embodiment of the utility model;

[0032] Figure 5 It is a schematic structural diagram of the second roller group provided in the embodiment of the utility model.

[0033] Explanation of the reference numerals: 1. base; 2. roller group; 3. pole piece; 21. first roller group; 22. second roller group; 23. third roller group; 24. fixing frame; 25. rotating joint; 211. first air outlet; 221. second air outlet; 231. third air outlet; 241. fixing ear plate. DETAILED DESCRIPTION

[0034] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Reference Figure 1 and Figure 2 As shown, in some embodiments of the utility model, an air flotation roller assembly is improved, including: a base 1 and a plurality of roller groups 2; the plurality of roller groups 2 are all arranged on the base 1, and the plurality of roller groups 2 are horizontally spaced and distributed, the roller group 2 includes an air flotation roller, and a belt running gap is provided between two adjacent air flotation rollers, the pole piece 3 is passed through the belt running gap to be wound around the plurality of roller groups 2 to form a U-shaped groove or an inverted U-shaped protrusion in the middle section, and the air flotation roller is suitable for generating an airflow to blow toward the pole piece 3 to fix the pole piece 3.

[0039] Specifically, the base 1 is an installation foundation for multiple roller groups 2, and the multiple roller groups 2 are arranged on the base 1 at intervals horizontally. The roller group 2 includes an air flotation roller, and a belt running gap is provided between two adjacent air flotation rollers. The pole piece 3 is passed through the belt running gap to be wound on the multiple roller groups 2 to form a U-shaped groove or an inverted U-shaped protrusion. The air flotation roller is suitable for generating an airflow blowing toward the pole piece 3 to fix the pole piece 3; the pole piece 3 is wound on the multiple roller groups 2 and a U-shaped groove or an inverted U-shaped protrusion is formed in the middle section, so as to stabilize the pole piece 3, thereby ensuring that the pole piece 3 is smoothly transported on the air flotation roller group 2, avoiding shaking or deviation of the pole piece 3 during the belt running process, thereby improving the coating quality of the pole piece 3.

[0040] In some embodiments of the present invention, the roller set 2 includes a fixing frame 24 , and fixing ear plates 241 are provided at both ends of the fixing frame 24 , and the air floating roller is mounted on the fixing ear plates 241 .

[0041] Specifically, the air float roller fixing frame 24 is arranged on the fixed ear plate 241, and the power source at both ends of the pole piece 3 is used to achieve smooth transportation of the pole piece 3. During the transportation of the pole piece 3, the air float roller does not rotate to ensure the stability of the airflow blowing to the pole piece 3 and avoid shaking of the pole piece 3.

[0042] In some embodiments of the present invention, the air floatation roller is provided with a cavity, and one end of the air floatation roller is provided with a rotary joint 25 communicating with the cavity.

[0043] Specifically, a cavity is provided inside the air flotation roller, and a rotary joint 25 connected to the cavity is provided at one end of the air flotation roller. The rotary joint 25 is threadedly connected to the air flotation roller, which improves the convenience of connection and the assembly efficiency while ensuring the sealing performance.

[0044] Reference Figure 1 As shown, in the first embodiment of the utility model, the plurality of roller groups 2 include a first roller group 21, a second roller group 22 and a third roller group 23 which are horizontally spaced in sequence on the base 1, the first roller group 21 includes a first air flotation roller, the second roller group 22 includes a second air flotation roller, the third roller group 23 includes a third air flotation roller, a first tape running gap is formed between the first air flotation roller and the second air flotation roller, and a second tape running gap is formed between the second air flotation roller and the third air flotation roller, the pole piece 3 passes through the first tape running gap from the top of the first air flotation roller, goes around the bottom of the second air flotation roller, and then passes through the second tape running gap and goes around the top of the third air flotation roller to form a U-shaped groove at the second air flotation roller.

[0045] Specifically, the structures of the first roller group 21, the second roller group 22 and the third roller group 23 are consistent, a first belt-feeding gap is formed between the first air-floating roller and the second air-floating roller, and a second belt-feeding gap is formed between the second air-floating roller and the third air-floating roller. The pole piece 3 passes through the first belt-feeding gap and the second belt-feeding gap in sequence, goes from the top of the first air-floating roller to the bottom of the second air-floating roller, and goes out from the top of the third air-floating roller, thereby forming a U-shaped groove at the second air-floating roller. The second air-floating roller has a downward pressure on the pole piece 3, and the first air-floating roller and the third air-floating roller have an upward supporting force on the pole piece 3. The downward pressure and the supporting force are balanced with each other, thereby improving the stability of the pole piece 3 during the transportation process and preventing the pole piece 3 from shaking.

[0046] Reference Figure 3 , Figure 4 and Figure 5As shown, in some embodiments of the present invention, a plurality of rows of first air outlet holes 211 are arranged on the top of the first air floatation roller and on a side close to the second air floatation roller, a first cavity is arranged inside the first air floatation roller, and the first air outlet holes 211 are connected to the first cavity;

[0047] A plurality of rows of second air outlet holes 221 are provided at the bottom of the second air floatation roller, a second cavity is provided inside the second air floatation roller, and the plurality of second air outlet holes 221 are connected to the second cavity;

[0048] A plurality of rows of third air outlet holes 231 are arranged on the top of the third air floatation roller and on a side close to the second air floatation roller. A third cavity is arranged inside the third air floatation roller, and the third air outlet holes 231 are communicated with the third cavity.

[0049] In some embodiments of the present invention, multiple rows of first air outlet holes 211 are arranged clockwise from the top to the side close to the second air floatation roller along the circumference of the first air floatation roller, and the distribution surface of the multiple rows of first air outlet holes 211 is 1 / 4 of the roller surface of the first air floatation roller;

[0050] The plurality of rows of second air outlet holes 221 are arranged counterclockwise along the circumference of the second air floatation roller from the side close to the first air floatation roller to the side close to the third air floatation roller, and the distribution surface of the plurality of rows of second air outlet holes 221 is 1 / 2 of the roller surface of the second air floatation roller;

[0051] The plurality of rows of third air outlet holes 231 are arranged counterclockwise from the top to the side close to the second air floatation roller along the circumference of the third air floatation roller. The distribution surface of the plurality of rows of third air outlet holes 231 is 1 / 4 of the surface of the first air floatation roller.

[0052] Specifically, the distribution surface where the first air outlet holes 211 are located occupies 1 / 4 of the first air floatation roller, and are arranged clockwise along the top of the first air floatation roller to the side close to the second air floatation roller. The airflow blown out by the first air floatation roller forms a supporting force in the upper right direction on the electrode sheet 3, that is, it is decomposed into an upward component force and a rightward component force. The distribution surface where the second air outlet holes 221 are located occupies 1 / 2 of the roller surface of the second air floatation roller and are arranged counterclockwise from the side close to the first air floatation roller to the side close to the second air floatation roller. The airflow blown out by the second air floatation roller forms a downward pressure in the lower left direction and a downward pressure in the lower right direction on the electrode sheet 3, wherein the direction is The downward pressure in the lower left direction is decomposed into a downward component and a left component, that is, the downward pressure in the direction of the lower left and the supporting force in the direction of the upper right are balanced with each other; the distribution surface where the third air outlet 231 is located occupies 1 / 4 of the roller surface of the third air flotation roller, and is arranged counterclockwise from the top to the side close to the second air flotation roller. The airflow blown out by the third air flotation roller forms a supporting force in the direction of the upper left on the pole piece 3, and the supporting force in the direction of the upper left is decomposed into an upward component and a left component, and the supporting force in the direction of the upper left and the downward pressure in the direction of the lower right are balanced with each other, thereby ensuring that the pole piece 3 is fixed and avoiding the pole piece 3 from shaking during the tape walking process.

[0053] Reference Figure 2 As shown, in the second embodiment of the utility model, the plurality of roller groups 2 include a first roller group 21, a second roller group 22 and a third roller group 23 which are horizontally spaced in sequence on the base 1, the first roller group 21 includes a first air flotation roller, the second roller group 22 includes a second air flotation roller, the third roller group 23 includes a third air flotation roller, a first tape running gap is formed between the first air flotation roller and the second air flotation roller, and a second tape running gap is formed between the second air flotation roller and the third air flotation roller, the pole piece 3 passes through the first tape running gap from the bottom of the first air flotation roller, goes around the top of the second air flotation roller, and then passes through the second tape running gap and goes around the bottom of the third air flotation roller to form an inverted U-shaped protrusion at the second air flotation roller.

[0054] Specifically, the electrode piece 3 passes through the first belt-feeding gap and the second belt-feeding gap in sequence, goes around the bottom of the first air-floating roller, passes through the top of the second air-floating roller, and goes out from the bottom of the third air-floating roller, thereby forming an inverted U-shaped protrusion at the second air-floating roller. The second air-floating roller has an upward supporting force on the electrode piece 3, and the first air-floating roller and the third air-floating roller have a downward pressure on the electrode piece 3. The downward pressure and the supporting force are balanced with each other, thereby improving the stability of the electrode piece 3 during the transportation process and preventing the electrode piece 3 from shaking.

[0055] In some embodiments of the present invention, a plurality of rows of first air outlet holes 211 are arranged at the bottom of the first air floatation roller and at one side close to the second air floatation roller, a first cavity is arranged inside the first air floatation roller, and the first air outlet holes 211 are connected to the first cavity;

[0056] A plurality of rows of second air outlet holes 221 are provided on the top of the second air floatation roller, a second cavity is provided inside the second air floatation roller, and the plurality of second air outlet holes 221 are connected to the second cavity;

[0057] A plurality of rows of third air outlet holes 231 are arranged at the bottom of the third air floatation roller and at a side close to the second air floatation roller. A third cavity is arranged inside the third air floatation roller, and the third air outlet holes 231 are communicated with the third cavity.

[0058] In some embodiments of the present invention, multiple rows of first air outlet holes 211 are arranged counterclockwise from the bottom to the side close to the second air floatation roller along the circumference of the first air floatation roller, and the distribution surface of the multiple rows of first air outlet holes 211 is 1 / 4 of the roller surface of the first air floatation roller;

[0059] The plurality of rows of second air outlet holes 221 are arranged in a clockwise manner from the side close to the first air floatation roller to the side close to the third air floatation roller along the circumference of the second air floatation roller. The distribution surface of the plurality of rows of second air outlet holes 221 is 1 / 2 of the roller surface of the second air floatation roller.

[0060] The plurality of rows of third air outlet holes 231 are arranged clockwise from the bottom to the side close to the second air floatation roller along the circumference of the third air floatation roller. The distribution surface of the plurality of rows of third air outlet holes 231 is 1 / 4 of the surface of the first air floatation roller.

[0061] Specifically, the distribution surface where the first air outlet holes 211 are located occupies 1 / 4 of the first air floatation roller, and are arranged counterclockwise along the bottom of the first air floatation roller to the side close to the second air floatation roller. The airflow blown out by the first air floatation roller forms a downward pressure in the direction of the lower right on the electrode sheet 3, that is, it is decomposed into a downward component force and a right component force. The distribution surface where the second air outlet holes 221 are located occupies 1 / 2 of the roller surface of the second air floatation roller and are arranged clockwise from the side close to the first air floatation roller to the side close to the second air floatation roller. The airflow blown out by the second air floatation roller forms a supporting force in the direction of the upper left and a supporting force in the direction of the upper right on the electrode sheet 3, wherein the direction is The supporting force in the upper left is decomposed into an upward component and a left component, that is, the downward pressure in the direction of the lower right and the supporting force in the direction of the upper right are balanced with each other; the distribution surface where the third air outlet 231 is located occupies 1 / 4 of the roller surface of the third air flotation roller, and is arranged clockwise from the bottom to the side close to the second air flotation roller. The airflow blown out by the third air flotation roller forms a downward pressure in the direction of the lower left on the pole piece 3, and the downward pressure in the direction of the lower left is decomposed into a downward component and a left component, and the supporting force in the direction of the upper right and the downward pressure in the direction of the lower left are balanced with each other, thereby ensuring that the pole piece 3 is fixed and avoiding the pole piece 3 from shaking during the tape walking process.

[0062] The utility model also provides a coating device, which comprises two air floating roller groups.

[0063] Specifically, the battery is coated and manufactured by using a coating device equipped with two air flotation roller groups, thereby improving the battery quality and reducing the loss cost.

[0064] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An air flotation roller assembly, characterized in that: include: Base (1); A plurality of roller groups (2) are arranged on the base (1), the plurality of roller groups (2) are arranged horizontally and spaced apart, the roller group (2) comprises an air-floating roller, a belt-feeding gap is provided between two adjacent air-floating rollers, a pole piece (3) is passed through the belt-feeding gap and wound around the plurality of roller groups (2) to form a U-shaped groove or an inverted U-shaped protrusion in the middle section, the air-floating roller is suitable for generating an air flow to blow toward the pole piece (3) to fix the pole piece (3).

2. The air flotation roller assembly according to claim 1, characterized in that: The roller group (2) comprises a fixing frame (24), both ends of the fixing frame (24) are provided with fixing ear plates (241), and the air floating roller is mounted on the fixing ear plates (241).

3. The air flotation roller assembly according to claim 2, characterized in that: The air flotation roller is provided with a cavity, and one end of the air flotation roller is provided with a rotary joint (25) communicating with the cavity.

4. The air flotation roller assembly according to any one of claims 1 to 3, characterized in that: The plurality of roller groups (2) include a first roller group (21), a second roller group (22) and a third roller group (23) which are horizontally spaced in sequence on the base (1); the first roller group (21) includes a first air-floating roller, the second roller group (22) includes a second air-floating roller, and the third roller group (23) includes a third air-floating roller; a first tape running gap is formed between the first air-floating roller and the second air-floating roller, and a second tape running gap is formed between the second air-floating roller and the third air-floating roller; the pole piece (3) passes through the first tape running gap from the top of the first air-floating roller and goes around the bottom of the second air-floating roller, then passes through the second tape running gap and goes around the top of the third air-floating roller to form the U-shaped groove at the second air-floating roller.

5. The air flotation roller assembly according to claim 4, characterized in that: A plurality of rows of first air outlet holes (211) are arranged on the top of the first air floatation roller and on a side close to the second air floatation roller, a first cavity is arranged inside the first air floatation roller, and the first air outlet holes (211) are connected to the first cavity; A plurality of rows of second air outlet holes (221) are provided at the bottom of the second air flotation roller, a second cavity is provided inside the second air flotation roller, and the plurality of second air outlet holes (221) are in communication with the second cavity; A plurality of rows of third air outlet holes (231) are arranged on the top of the third air floatation roller and on a side close to the second air floatation roller. A third cavity is arranged inside the third air floatation roller. The third air outlet holes (231) are in communication with the third cavity.

6. The air flotation roller assembly according to claim 5, characterized in that: A plurality of rows of the first air outlet holes (211) are arranged in a clockwise manner from the top to the side close to the second air floatation roller along the circumference of the first air floatation roller, and a distribution surface where the plurality of rows of the first air outlet holes (211) are located is 1 / 4 of the roller surface of the first air floatation roller; A plurality of rows of the second air outlet holes (221) are arranged counterclockwise along the circumference of the second air floatation roller from a side close to the first air floatation roller to a side close to the third air floatation roller, and a distribution surface where the plurality of rows of the second air outlet holes (221) are located is 1 / 2 of the roller surface of the second air floatation roller; The plurality of rows of third air outlet holes (231) are arranged counterclockwise from the top to the side close to the second air floatation roller along the circumference of the third air floatation roller, and the distribution surface of the plurality of rows of third air outlet holes (231) is 1 / 4 of the roller surface of the first air floatation roller.

7. The air flotation roller assembly according to any one of claims 1 to 3, characterized in that: The plurality of roller groups (2) include a first roller group (21), a second roller group (22) and a third roller group (23) which are horizontally spaced in sequence on the base (1); the first roller group (21) includes a first air-floating roller, the second roller group (22) includes a second air-floating roller, and the third roller group (23) includes a third air-floating roller; a first tape running gap is formed between the first air-floating roller and the second air-floating roller, and a second tape running gap is formed between the second air-floating roller and the third air-floating roller; the pole piece (3) passes through the first tape running gap from the bottom of the first air-floating roller and around the top of the second air-floating roller, and then passes through the second tape running gap and around the bottom of the third air-floating roller to form the inverted U-shaped protrusion at the second air-floating roller.

8. The air flotation roller assembly according to claim 7, characterized in that: A plurality of rows of first air outlet holes (211) are arranged at the bottom of the first air floatation roller and on a side close to the second air floatation roller, a first cavity is arranged inside the first air floatation roller, and the first air outlet holes (211) are connected to the first cavity; A plurality of rows of second air outlet holes (221) are provided on the top of the second air flotation roller, a second cavity is provided inside the second air flotation roller, and the plurality of second air outlet holes (221) are connected to the second cavity; A plurality of rows of third air outlet holes (231) are arranged at the bottom of the third air floatation roller and on a side close to the second air floatation roller. A third cavity is arranged inside the third air floatation roller. The third air outlet holes (231) are in communication with the third cavity.

9. The air flotation roller assembly according to claim 8, characterized in that: A plurality of rows of the first air outlet holes (211) are arranged counterclockwise from the bottom to the side close to the second air floatation roller along the circumference of the first air floatation roller, and a distribution surface where the plurality of rows of the first air outlet holes (211) are located is 1 / 4 of the roller surface of the first air floatation roller; A plurality of rows of the second air outlet holes (221) are arranged in a clockwise manner from a side close to the first air floatation roller to a side close to the third air floatation roller along the circumference of the second air floatation roller, and a distribution surface where the plurality of rows of the second air outlet holes (221) are located is 1 / 2 of the roller surface of the second air floatation roller; The plurality of rows of third air outlet holes (231) are arranged in a clockwise manner from the bottom to the side close to the second air floatation roller along the circumference of the third air floatation roller, and the distribution surface of the plurality of rows of third air outlet holes (231) is 1 / 4 of the roller surface of the first air floatation roller.

10. A coating device, characterized in that: The invention comprises the air flotation roller assembly as claimed in any one of claims 1 to 9.

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