Air knife structure and coating equipment provided with same

Abstract

This application relates to the field of coating apparatus technology and provides an air knife structure and a coating device equipped with it. The air knife structure of this application includes an air knife body and adjustable interface modules, and the air knife structure has an air cavity. Multiple adjustable interface modules are arranged at intervals along the length direction of the air knife body; each adjustable interface module includes a sliding part and an air passage connector. The sliding part is slidably disposed on the air knife body along the length direction of the air knife body, and the air passage connector is disposed on the sliding part. The air inlet of the air passage connector is connected to an external air supply system, and the air outlet of the air passage connector is connected to the air cavity. The air knife structure of this application can improve the phenomenon of uneven air blowing by the air knife, thereby improving the quality of use of the coating equipment.

Description

Technical Field

[0001] This application relates to the field of coating apparatus technology, and in particular to an air knife structure and a coating device equipped with it. Background Technology

[0002] In photovoltaic device fabrication, perovskite absorber layers are frequently used in photovoltaic cells due to their excellent photoelectric conversion performance. The perovskite absorber layer is prepared by extruding a perovskite solution through a slit coating device die and uniformly coating it onto a conductive substrate. Then, the wet film is rapidly supersaturated using an air knife or vacuum flash evaporation device to form a stable mesophase. Finally, the film is annealed by heating to form a thin perovskite light-absorbing layer.

[0003] As a key piece of equipment for the formation of the intermediate phase in the perovskite light absorption layer, the air knife often only has fixed air inlet pipes in the middle or on both sides, making it difficult to control the same air outlet pressure on the side away from the air inlet. This results in uneven air blowing, which is not conducive to improving the quality of the coating equipment. Utility Model Content

[0004] In view of this, this application aims to propose an air knife structure to improve the problem of uneven air blowing by the air knife, thereby improving the quality of use of coating equipment.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] An air knife structure includes an air knife body with an air cavity, and a plurality of adjustable interface modules disposed on the air knife body, wherein each of the adjustable interface modules is arranged at intervals along the length direction of the air knife body.

[0007] Each of the adjustable interface modules includes a sliding part that slides along the length of the air knife body, and an air passage connector provided on the sliding part. The air inlet of the air passage connector is connected to an external air supply system, and the air outlet of the air passage connector is connected to the air cavity.

[0008] Furthermore, the air knife body is provided with a plurality of sliding guide grooves, each of which extends along the length direction of the air knife body, and each of the sliding parts is slidably disposed in each of the sliding guide grooves.

[0009] Furthermore, the air knife body is provided with a recessed first groove and a fixing seat, and the first groove and the fixing seat are multiple ones arranged at intervals along the length direction of the air knife body; each fixing seat covers the top of the corresponding first groove to form each sliding guide groove, and each fixing seat is provided with a clearance groove for avoiding the corresponding air passage connector, and the clearance groove restricts the movement stroke of the air passage connector.

[0010] Furthermore, the length L1 of the clearance groove in the sliding direction, the distance L2 from the air outlet to one end of the sliding part in the sliding direction, and the length L3 of the sliding guide groove in the sliding direction satisfy the following: L1 < L2, and L1 + 2L2 < L3.

[0011] Furthermore, the air knife body is provided with a recessed second groove, which is a plurality of the first grooves that are connected to each other; each second groove is located above the corresponding first groove, and each fixing seat is sealed in each second groove.

[0012] Furthermore, along the downward direction of the first groove, the first groove is located within the projected area of ​​the second groove to form a stepped structure, and the contact surface between the fixing seat and the second groove is sealed.

[0013] Furthermore, the sliding part includes a sliding sealing block, which, when sliding in the sliding guide groove, can form a seal between the fixed seat and the air knife body.

[0014] Furthermore, the moving distance L1 of each air passage connector along the length direction of the air knife body is between 1 and 100 mm.

[0015] Furthermore, each of the aforementioned air connection connectors is equipped with a control valve for controlling the intake pressure.

[0016] Compared with related technologies, this application has the following advantages:

[0017] (1) The air knife structure described in this application, through the setting of the adjustable interface module, can move the position of the air connector with the cooperation of the sliding part and the air connector. At the same time, the air connector connects the external air supply system and the air cavity, thereby moving the position of the air inlet of the air cavity of the air knife, thereby improving the phenomenon of uneven airflow caused by the imbalance of the air pressure center edge in the air cavity, and realizing uniform air blowing of the air knife, which helps to improve the quality of use of the coating equipment.

[0018] (2) The sliding guide groove facilitates the arrangement of the sliding part and the sliding setting of the sliding part. The structure is simple and easy to design and implement.

[0019] (3) The setting of the first groove and the fixed seat facilitates the setting and processing of the sliding guide groove. At the same time, the setting of the clearance groove facilitates the movement of the air connector and helps to constrain the stroke of the air connector, which is conducive to design and implementation.

[0020] (4) By making L1 < L2 and L1 + 2L2 < L3, it helps to better limit the active stroke of the air connector and avoid the sliding part from leaking air through the clearance groove during sliding, which helps with design implementation.

[0021] (5) The second groove facilitates the arrangement of the fixing seat on the air knife body, and the fixing seat is sealed in the second groove, which helps to ensure the sealing effect between the fixing seat and the air knife.

[0022] (6) By placing the first groove within the projected area of ​​the second groove, a stepped structure is formed, which facilitates the arrangement of the fixing seat in the second groove and helps to ensure the sealing effect.

[0023] (7) The setting of the sliding sealing block helps to ensure the dynamic seal between the fixed seat and the air knife body, which is conducive to design and implementation.

[0024] (8) By making the movement distance of each air passage joint between 1-100mm, it is easy to adapt to the requirements of different air knives for the internal airflow balance, which is helpful for design and implementation.

[0025] (9) By setting the control valve, it is helpful to better control the intake pressure, better balance the airflow in the air knife, and facilitate the design and implementation.

[0026] This application also proposes a coating apparatus, wherein the coating apparatus is provided with the air knife structure described above.

[0027] The coating equipment of this application has the same beneficial effects as the air knife structure described above compared to the prior art, so it will not be described again here. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the air knife structure described in the embodiments of this application;

[0030] Figure 2 for Figure 1 Enlarged view of point A;

[0031] Figure 3 This is a top view of the air knife structure described in the embodiment of this application;

[0032] Figure 4 for Figure 3 Cross-sectional view of BB section;

[0033] Figure 5 for Figure 4 Enlarged view of point C;

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Main body of the air blade;

[0036] 101. Air cavity; 102. Sliding guide groove; 103. First groove; 104. Fixing base; 105. Clearance groove; 106. Second groove;

[0037] 2. Adjustable interface module;

[0038] 201. Sliding part; 202. Air passage connector. Detailed Implementation

[0039] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0041] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0043] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0045] An embodiment of the first aspect of this application provides an air knife structure, which is used in a coating equipment for preparing batteries. It is mainly used to process the wet film after coating. The air knife structure in this embodiment, with its structural innovation, can blow air evenly when processing the wet film, so that the wet film is supersaturated and forms a uniform meso phase, which helps to improve the quality of use of the coating equipment.

[0046] In related technologies, perovskite absorber layers are frequently used in photovoltaic cells due to their excellent photoelectric conversion performance during the fabrication of photovoltaic devices. During the fabrication of the perovskite absorber layer, a perovskite solution is extruded through a slit coating device die and uniformly coated onto a conductive substrate. Then, the wet film is rapidly supersaturated using an air knife or vacuum flash evaporation device to form a stable mesophase. Finally, the perovskite light-absorbing layer film is formed through heating and annealing.

[0047] As a key piece of equipment for forming the mesophase of the perovskite light-absorbing layer, the air knife often only has fixed air inlet pipes in the middle or on both sides. Due to the pressure loss of gas in the internal flow channel of the air knife, there will be a significant pressure decay in the area far from the air inlet pipe. It is difficult to control the same air pressure on the side far from the air inlet, resulting in uneven blowing. This leads to component segregation and density unevenness in the mesophase formed by the wet film, which is not conducive to improving the quality of the coating equipment.

[0048] In view of this, in order to overcome the shortcomings of the related technologies, this embodiment combines... Figures 1 to 5 As shown, the overall design includes the air blade body 1 and the adjustable interface module 2.

[0049] The air knife body 1 has an air cavity 101 inside, and multiple adjustable interface modules 2 are arranged at intervals along the length of the air knife body 1. Each adjustable interface module 2 includes a sliding part 201 that is slidably disposed along the length of the air knife body 1, and an air passage connector 202 disposed on the sliding part 201. The air inlet of the air passage connector 202 is connected to an external air supply system, and the air outlet of the air passage connector 202 is connected to the air cavity 101.

[0050] Therefore, by setting the adjustable interface module 2, with the cooperation of the sliding part 201 and the air connector 202, the position of the air connector 202 can be moved. At the same time, the air connector 202 connects the external air supply system and the air cavity 101, thereby moving the position of the air inlet of the air cavity 101 of the air knife. This improves the uneven airflow caused by the imbalance of the air pressure center and edge in the air cavity 101, and enables uniform air blowing of the air knife, which helps to improve the quality of use of the coating equipment.

[0051] Based on the above overall introduction, specifically regarding the air knife body 1 in this embodiment, combined with... Figure 1 , Figure 3 and Figure 4 As shown, it generally has an internal air cavity 101.

[0052] The air cavity 101 mentioned above can also be called a flow channel, and is generally used for airflow. The shape of the air cavity 101 can be based on the shape of the air cavity 101 in the existing air knife structure, and will not be described in detail here. The material of the air knife body 1 mentioned above can also be based on the material of the air knife body 1 in the existing air knife structure (such as aluminum alloy), and will not be described in detail here either. In addition, the air passage connector 202 mentioned above can also be the air passage connector 202 in the existing air knife structure, and will not be described in detail here either.

[0053] The connection method between the above-mentioned air connector 202 and the external air supply system can also refer to the connection method of the relevant structure in the existing air knife structure (such as pipeline connection, etc.), and will not be described again here.

[0054] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, this embodiment may, for example, provide a plurality of sliding guide grooves 102 on the air knife body 1.

[0055] Each sliding guide groove 102 extends along the length of the air knife body 1, and each sliding part 201 is slidably disposed in each sliding guide groove 102.

[0056] It is understandable that the sliding guide groove 102 facilitates the arrangement of the sliding part 201 and the sliding setting of the sliding part 201. The structure is simple and easy to design and implement.

[0057] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the air knife body 1 with a sliding guide groove 102 as an example, this embodiment may, for example, have a first recessed groove 103 and a fixing seat 104 on the air knife body 1.

[0058] The first groove 103 and the fixed seat 104 are arranged in multiple intervals along the length of the air knife body 1. Each fixed seat 104 covers the top of the corresponding first groove 103 to form a sliding guide groove 102. Each fixed seat 104 is provided with a clearance groove 105 for avoiding the corresponding air passage connector 202. The clearance groove 105 restricts the movement stroke of the air passage connector 202.

[0059] It is understandable that the setting of the first groove 103 and the fixed seat 104 facilitates the setting and processing of the sliding guide groove 102, while the setting of the clearance groove 105 facilitates the movement of the air connector 202 and helps to constrain the stroke of the air connector 202, which is beneficial to the design and implementation.

[0060] In specific implementation, the sliding guide groove 102 can be made by the cooperation of the fixed seat 104 and the first groove 103, or it can be directly formed on the air knife body 1. For example, an avoidance groove 105 can be formed on the air knife body 1, and a corresponding sliding guide groove 102 can be formed below the avoidance groove 105.

[0061] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the air knife body 1 with a first groove 103 and a fixing seat 104 as an example, this embodiment can, for example, make the length L1 of the clearance groove 105 in the sliding direction, the distance L2 of the air outlet to one end of the sliding part 201 in the sliding direction, and the length L3 of the sliding guide groove 102 in the sliding direction satisfy: L1 < L2, and L1 + 2L2 < L3.

[0062] It is understandable that by making L1 < L2 and L1 + 2L2 < L3, it helps to better limit the active stroke of the air connector 202 and can prevent the sliding part 201 from leaking air through the clearance groove 105 during sliding, which is helpful for design implementation.

[0063] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the first groove 103 and the fixing seat 104 on the air knife body 1 as an example, this embodiment may, for example, have a second groove 106 that is recessed on the air knife body 1.

[0064] Among them, there are multiple second grooves 106 that are connected to each of the first grooves 103 in a one-to-one correspondence, and each second groove 106 is located above the corresponding first groove 103. Each fixing seat 104 is sealed in each of the second grooves 106 in a one-to-one correspondence.

[0065] It is understandable that the second groove 106 facilitates the arrangement of the fixing seat 104 on the air knife body 1, and the fixing seat 104 is sealed in the second groove 106, which helps to ensure the sealing effect between the fixing seat 104 and the air knife.

[0066] In a specific implementation, the bottom of the sliding part 201 can slide against each of the second grooves 106, and the top of the sliding part 201 slides against the fixed seat 104. At this time, the sliding guide groove 102 is formed between the fixed seat 104 and the second groove 106. The sealing between each fixed seat 104 and the second groove 106 can be achieved by adhesive bonding or by setting a sealing gasket between the fixed seat 104 and the second sealing layer.

[0067] Furthermore, when the sliding part 201 is made of rubber, the sliding part 201 itself can serve as a sealing structure between the fixing seat 104 and the second sealing layer.

[0068] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the air knife body 1 having a second groove 106 as an example, this embodiment can, for example, make the second groove 106 located within the projected area of ​​the second groove 106 along the downward direction of the first groove 103, so as to form a stepped structure, and the contact surface between the fixing seat 104 and the second groove 106 is sealed.

[0069] It is understandable that by placing the first groove 103 within the projected area of ​​the second groove 106 to form a stepped structure, the mounting base 104 is facilitated in the second groove 106, and the sealing effect is ensured.

[0070] In a specific implementation, the first groove 103 and the second groove 106 are arranged vertically along the height direction of the air knife. The second groove 106 is formed above the first groove 103, and along the height direction of the air knife, the projection area of ​​the first groove 103 is within the projection area of ​​the second groove 106. At this time, the bottom surface of the second groove 106 and the side surface of the first groove 103 form a stepped structure, which facilitates the arrangement of the fixing seat 104 and the sliding part 201.

[0071] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, taking the air knife body 1 having a first groove 103 and a fixing seat 104 as an example, this embodiment may, for example, make the sliding part 201 include a sliding sealing block.

[0072] When the sliding sealing block slides in the sliding guide groove 102, it can form a seal between the fixed seat 104 and the air knife body 1.

[0073] Understandably, the sliding sealing block helps to ensure dynamic sealing between the fixed seat 104 and the air knife body 1, which is beneficial for design and implementation.

[0074] In practical implementation, the sliding sealing block can be made of rubber, for example. When the air connector 202 introduces airflow into the air cavity 101, the upper surface of the sliding part 201 can abut against the fixed seat 104 under the pressure of the airflow, thereby facilitating the sliding sealing effect of the sliding part 201 during the sliding process.

[0075] In addition, when the sliding seal block is made of rubber, the sliding seal block and the air connector 202 can be connected by vulcanization to ensure that the air connector 202 can move together with the sliding seal block in the sliding guide groove 102 and to ensure the sealing between the air connector 202 and the sliding seal block.

[0076] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, this embodiment may, for example, allow each air connector 202 to move a distance L1 along the length of the air knife body 1 between 1 and 100 mm.

[0077] Understandably, by making the movement distance of each air passage connector 202 between 1-100mm, it is easier to adapt to the requirements of different air knives for internal airflow balance, which is helpful for design and implementation.

[0078] In practical implementation, the moving distance of each air connector 202 can be designed according to the pressure requirements within the air cavity 101 of the air knife body 1. For locations with uneven pressure within the air cavity 101 and the length of the air knife body 1, the moving distance of each air connector 202 is set accordingly, only needing to ensure that the pressure within the air cavity 101 is balanced when supplying gas. For example, the moving distance of each air connector 202 can be 80mm. The air connectors 202 are arranged at intervals along the length of the air knife body 1, ensuring that the moving distance of each air connector 202 is 80mm. This forms multiple movable air inlets at the top of the air knife body 1. By adjusting the position of each air inlet, the airflow within the air cavity 101 of the air knife body 1 can be balanced.

[0079] Continue to combine Figures 1 to 5 As shown, in some exemplary embodiments, this embodiment may, for example, provide a control valve for controlling the intake pressure on the air path of each air path connector 202.

[0080] Understandably, the setting of the control valve helps to better control the intake pressure, better balance the airflow within the air knife, and facilitates design and implementation.

[0081] In practical implementation, the above control valves can refer to the control valves set between the existing air knife structure and the external air supply system. Control valves are set for each air passage joint 202 to facilitate individual control of the pressure of each air passage joint 202, which helps to better adjust the airflow unevenness in the air cavity 101.

[0082] It is worth noting that, regarding the air knife structure of this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 5 As shown, it generally includes a wind knife body 1 and an adjustable interface module 2.

[0083] The air knife body 1 has an air cavity 101 inside, and a sliding guide groove 102 is provided on the air knife body 1. The sliding guide groove 102 is located above the air cavity 101 and communicates with the air cavity 101. The air knife body 1 has multiple first grooves 103, second grooves 106 and fixing seats 104 recessed at the top and bottom. The fixing seats 104 cover the second grooves 106 to form the sliding guide grooves 102.

[0084] The adjustable interface module 2 includes an air connector 202 and a sliding part 201. The air connector 202 is fixedly mounted on the sliding part 201, and the sliding part 201 is slidably mounted along the length of the air knife body 1. The fixed base 104 is provided with a relief groove 105 corresponding to the sliding stroke of the air connector 202.

[0085] The length L1 of the clearance groove 105 in the sliding direction, the distance L2 from the air outlet to one end of the sliding part 201 in the sliding direction, and the length L3 of the sliding guide groove 102 in the sliding direction satisfy the following: L1 < L2, and L1 + 2L2 < L3, where L1 is 80mm.

[0086] The sliding part 201 includes a sliding sealing block made of rubber, and the air passage connector 202 is vulcanized on the sliding sealing block. Each air passage connector 202 is equipped with a control valve for controlling the intake pressure on the air passage between it and the external air supply system.

[0087] In the above preferred embodiments, the specific settings and arrangements of the air knife body 1, the adjustable interface module 2, the sliding part 201, and the air passage connector 202 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the air knife body 1, the adjustable interface module 2, the sliding part 201, and the air passage connector 202 can also be referred to the descriptions in the above exemplary embodiments.

[0088] The air knife structure of this embodiment adopts the above design. With the setting of the adjustable interface module 2, the position of the air connector 202 can be moved with the cooperation of the sliding part 201 and the air connector 202. At the same time, the air connector 202 connects the external air supply system and the air cavity 101, thereby moving the position of the air inlet of the air cavity 101 of the air knife. This improves the uneven airflow caused by the imbalance of the air pressure center and edge in the air cavity 101, and enables uniform air blowing of the air knife, which helps to improve the quality of use of the coating equipment.

[0089] An embodiment of the second aspect of this application provides a coating apparatus having an air knife structure as described above.

[0090] In the coating equipment of this embodiment, the aforementioned air knife structure is connected to an external air supply system, typically via a pipeline. Furthermore, the remaining related structures in this coating equipment can be derived from existing coating equipment structures, and will not be elaborated upon here.

[0091] The coating equipment of this embodiment, through the air knife structure set as described above, can move the position of the air connector 202. At the same time, the air connector 202 connects the external air supply system and the air cavity 101, thereby moving the position of the air inlet of the air cavity 101 of the air knife. This improves the phenomenon of uneven airflow caused by the imbalance of air pressure center and edge in the air cavity 101, and enables uniform air blowing of the air knife, which helps to improve the quality of use of the coating equipment.

[0092] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A wind knife structure, characterized in that: It includes an air knife body with an air cavity, and a plurality of adjustable interface modules disposed on the air knife body, wherein each of the adjustable interface modules is arranged at intervals along the length direction of the air knife body; Each of the adjustable interface modules includes a sliding part that slides along the length of the air knife body, and an air passage connector provided on the sliding part. The air inlet of the air passage connector is connected to an external air supply system, and the air outlet of the air passage connector is connected to the air cavity.

2. The air knife structure according to claim 1, characterized in that: The air knife body is provided with multiple sliding guide grooves, each of which extends along the length of the air knife body, and each sliding part is slidably disposed in each of the sliding guide grooves.

3. The air knife structure according to claim 2, characterized in that: The air knife body is provided with a recessed first groove and a fixing seat, and the first groove and the fixing seat are multiple ones arranged at intervals along the length direction of the air knife body; Each of the fixed seats covers the top of the corresponding first groove to form each of the sliding guide grooves, and each of the fixed seats is provided with a clearance groove for avoiding the corresponding air passage connector, the clearance groove restricting the movement stroke of the air passage connector.

4. The air knife structure according to claim 3, characterized in that: The length L1 of the clearance groove in the sliding direction, the distance L2 from the air outlet to one end of the sliding part in the sliding direction, and the length L3 of the sliding guide groove in the sliding direction satisfy the following: L1 < L2, and L1 + 2L2 < L3.

5. The air knife structure according to claim 3, characterized in that: The air knife body is provided with a recessed second groove, which is a plurality of the first grooves that correspond one-to-one with each of the first grooves; Each of the second grooves is located above the corresponding first groove, and each of the fixing seats is sealed in each of the second grooves.

6. The air knife structure according to claim 5, characterized in that: Along the downward direction of the first groove, the first groove is located within the projected area of ​​the second groove to form a stepped structure, and the contact surface between the fixing seat and the second groove is sealed.

7. The air knife structure according to claim 3, characterized in that: The sliding part includes a sliding sealing block, which, when sliding in the sliding guide groove, can form a seal between the fixed seat and the air knife body.

8. The air knife structure according to claim 1, characterized in that: The moving distance L1 of each air passage connector along the length direction of the air knife body is between 1 and 100 mm.

9. The air knife structure according to any one of claims 1 to 8, characterized in that: Each of the aforementioned air connection connectors is equipped with a control valve for controlling the intake pressure.

10. A coating apparatus, characterized in that: The coating equipment is provided with an air knife structure as described in any one of claims 1 to 9.

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