Air knife mechanism and coating equipment

Abstract

The utility model discloses an air knife mechanism and coating equipment in the technical field of perovskite film drying. The air knife mechanism is applied to the coating equipment and comprises an air knife used for generating airflow; the baffle assembly is arranged on the periphery of the air knife and used for guiding and restraining the airflow. According to the air knife mechanism and the coating equipment disclosed by the utility model, the baffle plate assembly is introduced to guide and restrain air flow around the air knife, so that the problems of non-uniform air flow distribution, local high-pressure area formation, poor liquid curtain stability and the like in a coating process are solved, the stability of the liquid curtain of coating liquid and the drying uniformity of a wet film are improved, and the coating efficiency is improved. And the adaptability and economical efficiency of the coating process are also enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of perovskite film drying especially relates to a wind knife mechanism and coating equipment. BACKGROUND

[0002] In the coating process, in order to consider economy and efficiency, the wind knife is often used as a film drying device. However, the wind knife has the following problems in practical application:

[0003] The distance between the coating die lip and the coated substrate is extremely close (about 100 to 300 microns), and the high-speed airflow blown by the wind knife reduces the flow rate in the narrow space below the coating head. According to Bernoulli's equation, the reduction in flow rate will cause the static pressure to rise, thereby forming a local high-pressure area below the coating head, referring to Figure 5 This high-pressure area will interfere with the stability of the liquid curtain of the coating liquid, causing wet film defects and affecting the coating quality. In addition, the airflow blown by the edge of the wind knife is easily dissipated by the vortex formed by the surrounding air, and cannot directly act on the edge of the wet film, resulting in slower drying of the edge of the wet film.

[0004] During the coating process, when the wind knife blows towards or away from the coating head, the airflow blown by the wind knife is easy to form a vortex, causing kinetic energy loss or uneven distribution of air volume. When the wind knife blows towards the coating head, the air flow rate on the upper surface of the coated substrate can reach 10 m / s. The high-speed airflow reaching the coating head lip will cause: the liquid curtain entrains air, producing bubbles on the coated surface; part of the wet film dries prematurely (mostly in the central area of the wet film), causing uneven nucleation and crystal growth, and thus causing product failure. When the wind knife blows away from the coating head, the airflow involved in drying is mainly the ambient air entrained by the wind curtain of the wind knife, and its speed distribution is uneven, which is not conducive to the uniform drying of the wet film.

[0005] As can be seen from the above, the conventional wind knife mechanism lacks effective airflow guiding and restraining devices, and has problems such as uneven airflow distribution, local high-pressure area formation, poor liquid curtain stability, and uneven wet film drying in the coating process. Therefore, the present application proposes a wind knife mechanism and coating equipment. SUMMARY

[0006] The purpose of the utility model is to provide a wind knife mechanism and coating equipment for guiding and restraining airflow to solve the problems of uneven airflow distribution, local high-pressure area formation, poor liquid curtain stability, etc. in the coating process, which not only can improve the stability of the liquid curtain of the coating liquid and the uniformity of the drying of the wet film, but also can enhance the adaptability and economy of the coating process.

[0007] The purpose of the utility model is achieved by adopting the following technical solutions:

[0008] On the one hand, the utility model provides a wind knife mechanism, comprising:

[0009] A wind knife is used to generate an air flow;

[0010] A baffle assembly is arranged at the periphery of the wind knife for guiding and restraining the air flow.

[0011] The above-mentioned scheme has the beneficial effects that: the baffle assembly is arranged at the periphery of the wind knife, surrounds or half-surrounds the wind knife, can effectively guide and restrain the air flow, avoids the air flow directly impacting the liquid curtain of the coating liquid, reduces the interference of the air flow on the stability of the liquid curtain of the coating liquid, and thus improves the coating quality. Meanwhile, the introduction of the baffle assembly optimizes the air flow distribution, reduces the formation of local high-pressure areas, and improves the uniformity and drying effect of the wet film.

[0012] Further, the wind knife is arranged at one side of the coating die;

[0013] The baffle assembly comprises:

[0014] First and second baffles arranged at two sides of the wind knife for guiding the air flow to the edge of the wet film;

[0015] Further, a third baffle is arranged between the wind knife and the coating die for restraining the air flow and preventing the air flow from directly impacting the liquid curtain of the coating liquid.

[0016] The above-mentioned scheme has the beneficial effects that: the first and second baffles arranged at two sides of the wind knife can guide the air flow to the edge of the wet film, accelerate the drying speed of the edge, and avoid the problem of slow drying of the edge and fast drying of the middle. Meanwhile, the third baffle further restrains the air flow, prevents the air flow from directly impacting the liquid curtain of the coating liquid, reduces the risk of fluctuation and rupture of the liquid curtain, and improves the stability of the liquid curtain of the coating liquid.

[0017] Further, the wind knife is arranged opposite to the coating die;

[0018] The baffle assembly comprises:

[0019] A surrounding baffle surrounding the wind knife and forming an accommodation space for accommodating the wind knife and the coating die;

[0020] Further, a third baffle is arranged between the wind knife and the coating die for restraining the air flow and preventing the air flow from directly impacting the liquid curtain of the coating liquid.

[0021] The beneficial effects of the above scheme are: the utility model discloses a fence board is set to enclose the air knife and coating die in the containing space, effectively isolate the outside disorderly airflow, ensure that the airflow flows in the controllable range.

[0022] Further, the air knife comprises four sides connected in sequence, and the first side and the third side are oppositely arranged, and the second side and the fourth side are oppositely arranged.

[0023] One end of the first baffle is connected to the first side, and the other end of the first baffle is connected to one side of the coating die.

[0024] One end of the second baffle is connected to the third side, and the other end of the second baffle is connected to the other side of the coating die.

[0025] The third baffle is installed on the coating die and faces the fourth side.

[0026] The beneficial effects of the above scheme are: the utility model discloses a first baffle and second baffle are connected to the air knife and coating die respectively, forming a stable airflow guiding structure, ensuring that the airflow is uniformly distributed and flows to the edge of the wet film. The installation of the third baffle further optimizes the airflow path, reduces the direct impact of the airflow on the liquid curtain of the coating liquid, and improves the stability of the liquid curtain of the coating liquid and the drying uniformity of the wet film.

[0027] Further, each baffle is a rigid baffle, and the distance between each baffle and the coating substrate is greater than the distance between the coating die and the coating substrate.

[0028] The beneficial effects of the above scheme are: the utility model discloses a rigid baffle and ensures that the distance between the baffle and the coating substrate is greater than the distance between the coating die and the coating substrate, which can effectively avoid the interference of the baffle to the wet film, while ensuring that the airflow flows uniformly under the guidance of the baffle, reducing the disturbance of the airflow to the liquid curtain of the coating liquid, and improving the stability of the coating process and product quality.

[0029] Further, the difference between the distance between the baffle and the coating substrate and the distance between the coating die and the coating substrate is greater than or equal to a first threshold value,

[0030] The first threshold value is 5 to 10 microns.

[0031] The beneficial effects of the above scheme are: the utility model discloses that the difference between the distance between the baffle and the coating substrate and the distance between the coating die and the coating substrate is greater than or equal to 5 to 10 microns, which ensures that the baffle can effectively guide the airflow and will not cause mechanical interference to the wet film, further optimizes the airflow distribution, and improves the stability of the liquid curtain of the coating liquid and the drying uniformity of the wet film.

[0032] Further, the air blowing port of the air knife and the liquid outlet lip of the coating die are both in the shape of a slit, and the elongation direction of the slit is parallel to the third baffle.

[0033] The beneficial effects of the above scheme are: the air blowing port of the air knife and the liquid outlet lip of the coating die are both in the shape of a slit, and the elongation direction of the slit is parallel to the third baffle, which can ensure that the flow direction of the airflow and the liquid curtain of the coating liquid are consistent, reduce the transverse impact of the airflow on the liquid curtain, and improve the stability of the liquid curtain of the coating liquid and the uniformity of the wet film.

[0034] Further, the air knife mechanism further comprises:

[0035] An adjusting assembly is drivingly connected to the air knife, for adjusting the angle between the airflow generated by the air blowing port of the air knife and the coating substrate, and the distance between the air blowing port of the air knife and the coating substrate;

[0036] The angle between the airflow generated by the air blowing port and the coating substrate is 60° to 120°;

[0037] The distance between the air blowing port and the coating substrate is 300μm to 10mm.

[0038] The beneficial effects of the above scheme are: the adjusting assembly adjusts the angle and distance between the air blowing port of the air knife and the coating substrate, which can flexibly adjust the airflow direction and intensity according to the process requirements, optimize the drying effect of the airflow on the wet film, avoid the influence of too strong or too weak airflow on the coating quality, and improve the adaptability and stability of the coating process.

[0039] Further, the angle between the air blowing port and the coating substrate is 90° to 120°;

[0040] Further, the distance between the air blowing port and the coating substrate is 3mm to 10mm.

[0041] The beneficial effects of the above scheme are: by setting the angle between the air blowing port and the coating substrate to 90° to 120°, the drying effect of the airflow on the wet film can be further optimized, the airflow can uniformly cover the surface of the wet film, the generation of uneven drying and wet film defects can be reduced, and the coating quality can be improved.

[0042] On the other hand, the utility model provides a kind of coating equipment, and the coating equipment comprises:

[0043] Coating die, the coating die is used to coat coating liquid on coating substrate to form wet film;

[0044] Air knife mechanism, the air knife mechanism is the air knife mechanism described above, for drying wet film after coating;

[0045] Gantry mechanism, the gantry mechanism supports the coating die and the air knife mechanism

[0046] The beneficial effects of the above scheme are: the utility model discloses a wind knife mechanism and coating die and gantry mechanism are combined, form complete coating equipment, can realize efficient, stable coating and drying process. The air knife mechanism ensures that the airflow is evenly distributed, reduces the interference to the liquid curtain of the coating liquid, improves the stability of the liquid curtain of the coating liquid and the drying uniformity of the wet film, thereby improving the production efficiency and product quality of the overall coating equipment.

[0047] Compared with the prior art, the beneficial effects of the utility model at least include:

[0048] The utility model discloses a baffle assembly is arranged around the air knife, not only can effectively isolate external disorderly airflow, provide a relatively stable airflow environment for the liquid curtain of coating liquid, still can change the flow path of airflow, avoid the flow rate of airflow in narrow space sudden drop, thereby reduce the formation of local high pressure area. Specifically, the airflow flows according to specific path, restricts the flow direction of airflow, avoids the airflow directly impacting the liquid curtain of coating liquid, reduces the disturbance of airflow to the surface of liquid curtain, thereby reduces the influence of surface tension on the stability of liquid curtain, ensures the stable formation and falling of liquid curtain, thereby improves coating quality. Meanwhile, through the baffle assembly guiding and restricting airflow, ensures that airflow evenly covers the surface of wet film, avoids the problem of partial drying too fast or too slow. This uniform airflow distribution helps to improve the drying uniformity of wet film, reduces wet film defects, improves product quality. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 It is a structure schematic view of the air knife mechanism of the utility model embodiment.

[0050] Figure 2 It is another structure schematic view of the air knife mechanism of the utility model embodiment.

[0051] Figure 3 It is another structure schematic view of the air knife mechanism of the utility model embodiment.

[0052] Figure 4 It is a structure schematic view of the coating equipment of the utility model embodiment.

[0053] Figure 5 It is the air pressure distribution simulation diagram in coating equipment when not setting baffle structure.

[0054] Figure 6 It is the air pressure distribution simulation diagram in coating equipment when only setting horizontal baffle of the utility model embodiment.

[0055] Figure 7is the embodiment of the utility model only sets up the horizontal baffle, the distribution situation simulation diagram of airflow in the coating equipment.

[0056] Figure 8 is the embodiment of the utility model only sets up the horizontal baffer, the distribution situation simulation diagram of airflow in the coating equipment.

[0057] Figure 9 is the embodiment of the utility model only sets up the horizontal baffle, the distribution situation simulation diagram of airflow in the coating equipment.

[0058] Figure 10 is the embodiment of the utility model only sets up the horizontal baffle, the distribution situation simulation diagram of airflow in the coating equipment.

[0059] In the drawing: 1, air knife;11, air outlet;2, coating die;21, liquid outlet lip;3, coating base plate;4, baffle assembly;41, first baffle;42, second baffle;43, third baffle;44, containing space;5, adjusting assembly;51, distance adjusting unit;52, angle adjusting unit;6, gantry mechanism. DETAILED DESCRIPTION

[0060] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and fully convey the inventive aspects of example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and descriptions of the same elements will not be repeated.

[0061] The words expressing position and direction described in the utility model are all illustrated by taking the drawings as examples, but changes can also be made according to needs, and the changes made are all included in the protection scope of the utility model.

[0062] Reference Figure 4 In order to realize efficient and stable coating and drying process, the coating equipment of the utility model includes: coating die 2, air knife mechanism and gantry mechanism 6.

[0063] When applied, the air knife 1 is arranged on one side of the coating die 2, preferably, the air knife 1 is arranged opposite to the coating die 2, the coating die is used to coat the coating liquid on the coating base plate 3 to form a wet film, and the air knife mechanism is used to generate airflow to dry the wet film after coating. Further, the air outlet 11 of the air knife 1 and the liquid outlet lip 21 of the coating die 2 are both in the form of a narrow slit, and the elongation direction of the narrow slit is parallel to the fourth side surface and perpendicular to the direction of the coating base plate 3.

[0064] In actual application, the air knife mechanism and the coating die 2 are installed on the same gantry mechanism 6, the gantry mechanism 6 supports the coating die 2 and the air knife mechanism, and is perpendicular to the coating substrate 3. The gantry mechanism 6 can not only move the coating die 2 and the air knife mechanism along the direction of the coating substrate 3 during the coating process, but also can adjust the distance between the coating die 2 and the air knife mechanism and the coating substrate 3 before coating. Specifically, the distance between the coating die 2 and the coating substrate 3 is about 100 μm to 300 μm, and the distance between the air knife mechanism and the coating substrate 3 is 3 mm to 10 mm.

[0065] In actual production process, in order to adapt to the needs of mass production, the coating die and the air knife 1 are started at the same time.

[0066] Reference Figures 1-3 In order to ensure that the airflow is uniformly distributed, reduce the interference to the liquid curtain of the coating liquid, improve the stability of the liquid curtain of the coating liquid and the drying uniformity of the wet film, the air knife mechanism of the utility model comprises: air knife 1 and baffle assembly 4. Further, reference Figure 4 In order to be able to flexibly adjust the airflow direction and intensity according to the process requirement, optimize the drying effect of the airflow on the wet film, the air knife mechanism of the utility model can also comprise: adjusting assembly 5.

[0067] The adjusting assembly 5 of the utility model drives and connects the air knife 1.

[0068] Reference Figure 4 In order to adjust the angle and distance between the air blowing port 11 of the air knife 1 and the coating substrate 3, the adjusting assembly 5 of the utility model comprises distance adjusting unit 51 and angle adjusting unit 52.

[0069] The angle adjusting unit 52 is used for adjusting the angle between the airflow generated by the air blowing port 11 of the air knife 1 and the coating substrate 3. In application, the angle adjusting mechanism can comprise a rotating shaft arranged on the air knife 1 and an adjusting handle or a servo motor connected with the rotating shaft, and the blowing angle of the air knife 1 can be adjusted by rotating the adjusting handle or controlling the servo motor. In actual application, the angle between the airflow generated by the air blowing port 11 and the coating substrate 3 is: 60° to 120°, preferably, the angle between the air blowing port 11 and the coating substrate 3 is: 90° to 120°, that is, the air knife 1 is towards the coating die, more preferably, the angle between the air blowing port 11 and the coating substrate 3 is: 90°, at this time, the airflow momentum loss is small, the airflow is relatively concentrated, which is beneficial to the drying of the wet film.

[0070] The distance adjusting unit 51 is used for further accurately adjusting the distance between the blowing port 11 of the air knife 1 and the coated substrate 3. In application, the distance adjusting mechanism includes a lifting support arranged below the air knife 1 and an adjusting screw connected with the lifting support, and the distance between the air knife 1 and the coated substrate 3 can be adjusted by rotating the adjusting screw. In actual application, the distance between the blowing port 11 of the air knife mechanism and the coated substrate 3 is 300 μm to 10 mm. Preferably, the distance between the blowing port 11 of the air knife mechanism and the coated substrate 3 is 3 mm to 10 mm. In summary, the angle and the distance between the blowing port 11 of the air knife 1 and the coated substrate 3 are adjusted by the adjusting assembly 5, the airflow direction and the intensity can be flexibly adjusted according to the process requirements, the drying effect of the airflow on the wet film is optimized, the influence of the airflow that is too strong or too weak on the coating quality is avoided, and the adaptability and the stability of the coating process are improved.

[0071] In order to effectively isolate external chaotic airflow and provide a relatively stable airflow environment for the liquid curtain of the coating liquid, the baffle assembly 4 of the utility model is arranged at the peripheral part of the air knife 1 to surround or semi-surround the air knife 1. In addition, the baffle assembly 4 arranged at the peripheral part of the air knife 1 can change the flow path of the airflow, avoid the flow rate of the airflow from suddenly decreasing in the narrow space, thereby reducing the formation of local high-pressure areas, and can also guide and constrain the airflow, ensuring that the airflow uniformly covers the surface of the wet film.

[0072] Reference Figures 1-3 The baffle assembly 4 of the utility model includes rigid: the first baffle 41, the second baffle 42, the third baffle 43, the fourth baffle (not shown) and / or the fifth baffle (not shown), and the distance between each baffle and the coated substrate 3 is slightly greater than the distance between the coating die 2 and the coated substrate 3, so as to ensure that the baffle assembly 4 does not interfere with the wet film on the coated substrate 3. In application, the difference between the distance between the baffle and the coated substrate 3 and the distance between the coating die 2 and the coated substrate 3 is greater than or equal to a first threshold value, wherein the first threshold value is 5 μm to 10 μm. In actual application, the distance between the baffle and the coated substrate 3 is 105 μm to 310 μm, which ensures that the baffle neither mechanically interferes with the wet film nor effectively guides the airflow, optimizes the airflow distribution, and improves the stability of the liquid curtain of the coating liquid and the drying uniformity of the wet film.

[0073] The air knife 1 of the utility model includes four side faces connected in sequence, and the first side face and the third side face are oppositely arranged, the second side face and the fourth side face are oppositely arranged, and the first side face and the third side face are perpendicular to the second side face and the fourth side face. Among them, the fourth side face faces the coating die 2.

[0074] The baffle assembly 4 of the utility model includes at least five combination forms (1) to (5).

[0075] (1) The baffle assembly 4 includes the first baffle 41 and the second baffle 42.

[0076] The first baffle 41 and the second baffle 42 of the embodiment are arranged on both sides of the air knife 1, and both of the two longitudinal baffles extend to both sides of the coating die 2, for guiding the airflow to the edge of the wet film.

[0077] In application, one end of the first baffle 41 is connected to the first side surface, and the other end of the first baffle 41 is connected to one side of the coating die 2; one end of the second baffle 42 is connected to the third side surface, and the other end of the second baffle 42 is connected to the other side of the coating die 2.

[0078] (2) The baffle assembly 4 comprises a third baffle 43.

[0079] The third baffle 43 of the utility model is arranged between the air knife 1 and the coating die 2, for restraining the airflow and preventing the airflow from directly impacting the liquid curtain of the coating liquid.

[0080] In application, referring to Figure 2 and Figure 3 , the third baffle 43 is installed on the coating die 2 and faces the fourth side surface. In actual application, the third baffle 43 is parallel to the elongation direction of the narrow slit of the air blowing port 11 and the liquid outlet lip 21.

[0081] It can be known that, when only the third baffle 43 is arranged, the airflow blown out from the edge of the air knife 1 is easy to be dissipated by the vortex formed by the surrounding air and cannot directly act on the wet film. Figure 8 At this time, the wet film is not dried uniformly, the edge is dried slowly, and cracks are easy to appear. Figure 10

[0082] (3) The baffle assembly 4 comprises the first baffle 41, the second baffle 42 and the third baffle 43.

[0083] The first baffle 41 and the second baffle 42 of the embodiment are arranged on both sides of the air knife 1, and both of the two longitudinal baffles extend to both sides of the coating die 2, for guiding the airflow to the edge of the wet film. The third baffle 43 is arranged between the air knife 1 and the coating die 2, for restraining the airflow and preventing the airflow from directly impacting the liquid curtain of the coating liquid.

[0084] In application, referring to Figure 1 , one end of the first baffle 41 is connected to the first side surface, and the other end of the first baffle 41 is connected to one side of the coating die 2; one end of the second baffle 42 is connected to the third side surface, and the other end of the second baffle 42 is connected to the other side of the coating die 2; the third baffle 43 is installed on the coating die 2 and faces the fourth side surface. In actual application, the third baffle 43 is parallel to the elongation direction of the narrow slit of the air blowing port 11 and the liquid outlet lip 21.

[0085] It can be known that, when only the third baffle 43 is arranged, the airflow blown out from the edge of the air knife 1 is easy to be dissipated by the vortex formed by the surrounding air and cannot directly act on the wet film.

[0086] ​The third baffle plate 43 is arranged between the coating die 2 and the air knife 1, which can guide the airflow to flow along a specific path, restrict the flow direction of the airflow, reduce the disturbance of the airflow to the liquid curtain surface, reduce the influence of the surface tension on the stability of the liquid curtain, ensure the stable formation and falling of the liquid curtain, and improve the coating quality.

[0087] Reference Figure 9 The first baffle plate 41 and the second baffle plate 42 are arranged on the periphery of the coating die and the air knife 1, which can not only effectively isolate the external chaotic airflow and provide a relatively stable airflow environment for the liquid curtain of the coating liquid, but also guide the airflow to the wet film surface, ensure that the airflow uniformly acts on the wet film, avoid the problems of too fast or too slow local drying, and improve the drying efficiency of the wet film and the drying uniformity of the wet film.

[0088] In addition, during the coating process, the liquid curtain may be deviated due to the influence of the airflow or other factors. The first baffle plate 41, the second baffle plate 42 and the third baffle plate 43 can play a certain limiting role to prevent the deviation of the liquid curtain and ensure that the liquid curtain can accurately fall on the coating substrate 3.

[0089] (4) The baffle plate assembly 4 comprises a first baffle plate 41, a second baffle plate 42, a fourth baffle plate and a fifth baffle plate.

[0090] The fourth baffle plate, the first baffle plate 41, the fifth baffle plate and the second baffle plate 42 are sequentially connected, and the second baffle plate 42 is connected to the fourth baffle plate.

[0091] In application, the first baffle plate 41 and the second baffle plate 42 are oppositely arranged, the fourth baffle plate and the fifth baffle plate are oppositely arranged, the first baffle plate 41 and the second baffle plate 42 are perpendicularly arranged with the fourth baffle plate and the fifth baffle plate, and are combined into a square baffle plate, and the square baffle plate forms a containing space 44 surrounding the air knife 1.

[0092] In actual application, one end of the first baffle plate 41 is connected to the first side surface, and the other end of the first baffle plate 41 is connected to one side of the coating die 2; one end of the second baffle plate 42 is connected to the third side surface, and the other end of the second baffle plate 42 is connected to the other side of the coating die 2; the fourth baffle plate is connected to the second side surface; and the fifth baffle plate is installed on the coating die and connected to the side away from the air knife mechanism.

[0093] (5) The baffle assembly 4 comprises a first baffle 41, a second baffle 42, a third baffle 43, a fourth baffle and a fifth baffle.

[0094] The fourth baffle, the first baffle 41, the fifth baffle and the second baffle 42 are sequentially connected, and the second baffle 42 is connected to the fourth baffle, and the two ends of the third baffle 43 are respectively connected to the first baffle 41 and the second baffle 42.

[0095] In application, the third baffle 43 is parallel to the elongation direction of the narrow slit of the air blowing port 11 and the liquid outlet lip 21, the first baffle 41 and the second baffle 42 are oppositely arranged, the fourth baffle and the fifth baffle are oppositely arranged, and the first baffle 41 and the second baffle 42 are perpendicularly arranged with the fourth baffle and the fifth baffle. Preferably, the first baffle 41 and the second baffle 42 are parallel to the third baffle 43, the five baffles are combined into a square baffle, and the square baffle forms two containing spaces 44 separated by the horizontal baffle. Among them, one containing space 44 is used to contain the air knife 1, and the other containing space 44 is used to contain the coating die 2.

[0096] In actual application, one end of the first baffle 41 is connected to the first side surface, the other end of the first baffle 41 is connected to one side of the coating die 2; one end of the second baffle 42 is connected to the third side surface, the other end of the second baffle 42 is connected to the other side of the coating die 2; the fourth baffle is connected to the second side surface; the third baffle 43 is installed on the coating die 2 and connected to the side close to the fourth side surface; and the fifth baffle is installed on the coating die and connected to the side away from the air knife 1.

[0097] It can be known from the combination forms (4)-(5) that:

[0098] By arranging the square baffle around the coating die and the air knife 1, the airflow can be guided to the wet film surface, ensuring that the airflow acts uniformly on the wet film, avoiding the problems of too fast or too slow drying in local parts, and the uniform airflow distribution can improve the drying efficiency of the wet film and reduce the defects (such as cracks, bubbles, etc.) that may occur during the drying process.

[0099] By arranging the square baffle around the coating die and the air knife 1, the airflow can be guided to the wet film surface, ensuring that the airflow acts uniformly on the wet film, avoiding the problems of too fast or too slow drying in local parts, and the uniform airflow distribution can improve the drying efficiency of the wet film and reduce the defects (such as cracks, bubbles, etc.) that may occur during the drying process.

[0100] In addition, in the coating process, the liquid curtain can be deviated due to the influence of air flow or other factors. The baffle can limit the deviation of the liquid curtain and ensure that the liquid curtain falls accurately on the coated substrate 3.

[0101] According to the combination forms (1)-(5), after the rigid baffle is added, the flow path and characteristics of the air flow can be changed, the air flow speed is reduced at the baffle, and the weak air flow after passing through the baffle is difficult to form high pressure to disturb the wet film. Figures 5-7 The air flow blown by the air knife 1 can also be guided to the edge of the wet film to accelerate the drying speed of the edge. Figures 8-9 Further, the combination form and installation position of the baffle can be adjusted according to different coating liquids to adapt to the flow characteristics of the coating liquid and the coating process requirements.

[0102] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model, and all these changes should belong to the protection scope of the utility model claim.

Claims

1. A mechanism of air knife, characterized in that, The application relates to a wind knife mechanism. The wind knife mechanism comprises: a wind knife (1) for generating airflow; 2. The air knife mechanism of claim 1, wherein, a baffle assembly (4) arranged on the periphery of the wind knife (1) for guiding and confining the airflow. The wind knife (1) is arranged on one side of a coating die (2); The baffle assembly (4) comprises: a first baffle (41) and a second baffle (42) arranged on both sides of the wind knife (1) for guiding the airflow to the edge of a wet film; 3. The air knife mechanism of claim 2, wherein, and / or a third baffle (43) arranged between the wind knife (1) and the coating die (2) for confining the airflow and preventing the airflow from directly impacting a liquid curtain of a coating liquid. The wind knife (1) is arranged opposite to the coating die (2); The baffle assembly (4) comprises: an enclosing baffle surrounding the wind knife (1) and forming a containing space (44) for containing the wind knife (1) and the coating die (2); 4. The air knife mechanism of claim 2, wherein, and / or a third baffle (43) arranged between the wind knife (1) and the coating die (2) for confining the airflow and preventing the airflow from directly impacting a liquid curtain of a coating liquid. The wind knife (1) comprises four sides connected in sequence, and the first side and the third side are arranged opposite to each other, and the second side and the fourth side are arranged opposite to each other; one end of the first baffle (41) is connected to the first side, and the other end of the first baffle (41) is connected to one side of the coating die (2); one end of the second baffle (42) is connected to the third side, and the other end of the second baffle (42) is connected to the other side of the coating die (2); 5. The air knife mechanism of claim 2, wherein, the third baffle (43) is mounted on the coating die (2) and faces the fourth side.

6. The air knife mechanism of claim 5, wherein, Each baffle is a rigid baffle, and the distance between each baffle and a coating substrate (3) is greater than the distance between the coating die (2) and the coating substrate (3). The difference between the distance between the baffle and the coating substrate (3) and the distance between the coating die (2) and the coating substrate (3) is greater than or equal to a first threshold value, 7. The air knife mechanism of claim 2, wherein, wherein the first threshold value is 5-10 mu m.

8. The air knife mechanism of claim 1, wherein, The air outlet (11) of the wind knife (1) and the liquid outlet lip (21) of the coating die (2) are both in the shape of a narrow slit, and the elongation direction of the narrow slit is parallel to the third baffle (43). The wind knife mechanism further comprises: an adjusting assembly (5) drivingly connected to the wind knife (1) for adjusting the angle between the airflow generated by the air outlet (11) of the wind knife (1) and the coating substrate (3) and the distance between the air outlet (11) of the wind knife (1) and the coating substrate (3); the angle between the airflow generated by the air outlet (11) and the coating substrate (3) is 60-120 degrees; 9. The air knife mechanism of claim 8, wherein, the distance between the air outlet (11) and the coating substrate (3) is 300-10 mm. the angle between the air outlet (11) and the coating substrate (3) is 90-120 degrees; and / or the distance between the air outlet (11) and the coating substrate (3) is 3-10 mm.

10. A coating apparatus characterized by comprising: The coating apparatus comprises: a coating die (2) for coating a coating liquid on a coating substrate (3) to form a wet film; an air knife mechanism according to any one of claims 1 to 9 for drying the coated wet film; a gantry mechanism (6) supporting the coating die (2) and the air knife mechanism.

Images