Flat plate coating device

Abstract

The utility model relates to the technical field of coating, in particular to a flat plate coating device which comprises a die head body, a cavity for feeding is arranged in the die head body, a coating lip is arranged on one side of the die head body along the width direction of the die head body, and the cavity is communicated with the coating lip through a coating slit. A through hole is formed in the side, deviating from the coating lip, of the die head body, the through hole communicates with the cavity, the through hole communicates with a first pipeline assembly, a first feeding port and an emptying port are formed in the first pipeline assembly, and the first feeding port and the emptying port both communicate with the through hole; and a second feeding hole is formed in the die head body and is communicated with the coating slit. The technical problems that when a coating die head of an existing flat plate coating device is emptied, air in a coating slit cannot be exhausted upwards in time and is easily mixed with coating liquid flowing down from a cavity to form small bubbles, the small bubbles are easily attached into the cavity due to small buoyancy, air in the cavity is difficult to exhaust, and the emptying effect is poor are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coating and specifically relates to a flat plate coating device. BACKGROUND

[0002] The flat plate coating device is mainly used for uniformly coating a coating liquid on a substrate to form a uniform thin film coating, and if air in the coating device cannot be discharged in time before coating, air bubbles may be formed in the coating, resulting in defects in the coating and affecting the uniformity and photoelectric performance of the coating.

[0003] The existing flat plate coating device generally comprises a coating die head, the coating die head has a cavity for feeding and a coating lip for coating, the cavity is communicated with the coating lip through a coating slit, the top of the coating die head is provided with a vent hole communicated with the cavity and a feeding hole communicated with the cavity, and when the cavity is vented, the coating liquid is injected into the cavity from the feeding hole at the top, the cavity has a large structure size, the gap of the coating slit is small, the cavity is filled first, the air in the coating slit cannot be discharged upward in time and is easily mixed with the coating liquid flowing downward in the cavity, small air bubbles are formed, the small air bubbles have small upward floating force and are easily attached in the cavity, the air in the cavity is difficult to discharge, and the venting effect is poor. SUMMARY

[0004] The utility model provides a kind of flat plate coating device, solve the technical problem that the coating die head of existing flat plate coating device when venting, air in the coating slit cannot be discharged upward in time and is easily mixed with the coating liquid flowing downward in the cavity, small air bubbles are formed, the small air bubbles have small upward floating force and are easily attached in the cavity, the air in the cavity is difficult to discharge, and the venting effect is poor.

[0005] Therefore, the utility model provides a kind of flat plate coating device, including die head body, the cavity for feeding is equipped in the die head body, the die head body is equipped with coating lip on one side along its width direction, the cavity is communicated with the coating lip by coating slit;

[0006] The side of the die head body away from the coating lip is provided with a through hole, the through hole is communicated with the cavity, the through hole is communicated with first pipe line assembly, the first pipe line assembly is equipped with first feeding hole and vent hole, the first feeding hole and the vent hole are communicated with the through hole;

[0007] The second feeding hole is equipped on the die head body, and the second feeding hole is communicated with the coating slit.

[0008] Optionally, the first pipe line assembly includes a first pipe, a second pipe, a third pipe and a first tee joint.

[0009] One end of the first pipeline is in communication with the through hole, and the other end is in communication with the first three-way joint;

[0010] One end of the second pipeline is in communication with the first three-way joint, and the other end is provided with the emptying port;

[0011] One end of the third pipeline is in communication with the first three-way joint, and the other end is provided with the first feeding port.

[0012] Optionally, the first pipeline is a transparent pipeline;

[0013] And / or, the second pipeline is a transparent pipeline;

[0014] And / or, the third pipeline is a transparent pipeline.

[0015] Optionally, the second feeding port is at a preset distance from the outlet end of the coating slit.

[0016] Optionally, the die body includes a first die, a second die, and a gasket, the through hole is arranged on the first die, and the second feeding port is arranged on the second die; one side of the gasket is provided with an opening for discharging; the gasket is clamped between the first die and the second die, and the coating slit is enclosed.

[0017] Optionally, the second feeding port is provided with two, the gasket is provided with a flow guide groove on both sides of the opening, the flow guide groove is in communication with the opening, and the position corresponding to the communication between the flow guide groove and the opening corresponds to the position of the coating slit; two second feeding ports are respectively in communication with two flow guide grooves.

[0018] Optionally, two second feeding ports are in communication through a second pipeline assembly, the second pipeline assembly is provided with a third feeding port, and the third feeding port is in communication with two second feeding ports.

[0019] Optionally, the second pipeline assembly includes a fourth pipeline, a fifth pipeline, and a second three-way joint;

[0020] The second three-way joint is in communication with two second feeding ports through two fourth pipelines respectively;

[0021] One end of the fifth pipeline is in communication with the second three-way joint, and the other end is provided with the third feeding port.

[0022] Optionally, the fourth pipeline is a transparent pipeline;

[0023] And / or, the fifth pipeline is a transparent pipeline.

[0024] Optionally, a valve control assembly is further included, and the first feeding port and the third feeding port are both communicated with the external feeding device through the valve control assembly, and the valve control assembly is used for controlling the first feeding port to be communicated with the external feeding device or the third feeding port to be communicated with the external feeding device.

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

[0026] 1. By setting the second feeding port on the die body, the coating liquid is introduced into the second feeding port, so that the coating liquid is extruded by the air from the bottom to the top in the coating slot, avoiding the mixing of the downward flowing coating liquid and the upward flowing air to form small bubbles, causing the air in the cavity and the coating slot to be unable to be effectively discharged, and the coating liquid is transported from the coating slot to the cavity, avoiding the coating liquid filling the cavity first, causing the air in the coating slot to be unable to be effectively discharged, improving the air discharge effect, and further improving the coating quality.

[0027] 2. The first pipeline assembly is used to communicate the exhaust port and the first feeding port with the through hole, only one through hole needs to be arranged on the die body, so that the exhaust and feeding can be realized, avoiding the separate arrangement of the exhaust port and the first feeding port on the die body, which causes interference when connecting the pipeline, and improving the space utilization. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0029] Figure 1 The structure schematic view of the flat plate coating device provided by the utility model at the first visual angle is shown in the figure.

[0030] Figure 2 The structure schematic view of the flat plate coating device provided by the utility model at the second visual angle is shown in the figure.

[0031] Figure 3 The structure schematic view of the gasket provided by the utility model at the second visual angle is shown in the figure.

[0032] Figure 4 The structure schematic view of the second die provided by the utility model at the third visual angle is shown in the figure.

[0033] Figure 5 Another structure schematic view of the second die provided by the utility model at the third visual angle is shown in the figure.

[0034] Figure 6 The first die provided by the utility model is shown in the structure diagram at the fourth visual angle.

[0035] Mark explanation:

[0036] 1, coating lip; 2, coating slit; 3, first feeding port; 4, emptying port; 5, through hole; 6, second feeding port; 7, first pipeline; 8, second pipeline; 9, third pipeline; 10, first three-way joint; 11, first die; 12, second die; 13, gasket; 14, flow guide groove; 15, fourth pipeline; 16, fifth pipeline; 17, second three-way joint; 18, third feeding port; 19, cavity; 20, opening. DETAILED DESCRIPTION

[0037] The technical scheme of the utility model will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0038] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as limiting or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In addition, the technical features involved in different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.

[0041] Embodiment 1

[0042] Please refer to Figures 1 to 6The embodiment provides a flat plate coating device, which comprises a die body, a cavity 19 for feeding is arranged in the die body, a coating lip 1 is arranged on one side of the die body along the width direction of the die body, the cavity 19 is communicated with the coating lip 1 through a coating slit 2, a through hole 5 is arranged on the side of the die body away from the coating lip 1, the through hole 5 is communicated with the cavity 19, the through hole 5 is communicated with a first pipeline assembly, a first feeding port 3 and a vent port 4 are arranged on the first pipeline assembly, the first feeding port 3 and the vent port 4 are both communicated with the through hole 5, and a second feeding port 6 is arranged on the die body and communicated with the coating slit 2.

[0043] It should be noted that the first feeding port 3 and the second feeding port 6 are both communicated with external feeding equipment.

[0044] In the embodiment, when the cavity 19 in the die body needs to be exhausted, the through hole 5 of the die body is arranged upwards, the coating lip 1 is first blocked, that is, the outlet end of the coating slit 2 is blocked, the vent port 4 is conducted and the first feeding port 3 is closed, then the coating liquid is slowly input through the second feeding port 6, the coating liquid enters the coating slit 2 and gradually fills the coating slit 2, until the liquid level of the coating liquid is higher than the communication position of the second feeding port 6 and the coating slit 2, then the input speed of the coating liquid is increased, so that the coating liquid fills the entire coating slit 2 from bottom to top, so that the air in the coating slit 2 is first exhausted into the cavity 19, then the coating liquid gradually fills the entire cavity 19 from bottom to top, and the air in the cavity 19 is exhausted through the vent port 4, after the air in the cavity 19 is completely exhausted, because there may be residual air between the first feeding port 3 and the first pipeline assembly, then the coating liquid is transported through the first feeding port 3, so that the air between the first feeding port 3 and the first pipeline assembly is exhausted, so that the air in the entire die body is fully exhausted, after the exhausting is completed, the coating lip 1 can be opened and the coating liquid is transported through the first feeding port 3 for coating, in the entire exhausting process, the coating liquid slowly rises from the bottom of the coating slit 2 from bottom to top, so that the air is extruded upwards by the coating liquid, the downward flowing coating liquid and the upward flowing air are prevented from mixing to form small bubbles, the air in the cavity 19 and the coating slit 2 cannot be effectively exhausted, the coating liquid is transported from the coating slit 2 to the cavity 19, the coating liquid is prevented from filling the cavity 19 first, the air in the coating slit 2 cannot be effectively exhausted, the air exhausting effect is improved, and then the coating quality is improved, in addition, the vent port 4 and the first feeding port 3 are communicated with the through hole 5 through the first pipeline assembly, only one through hole 5 needs to be arranged on the die body, so that the exhausting and feeding can be realized, the vent port 4 and the first feeding port 3 are prevented from being separately arranged on the die body, so that the interference is caused when the pipelines are connected, the structure is simple, and the space utilization rate is improved.

[0045] Embodiment 2

[0046] As a further improvement over Example 1, as shown in Figure 1 The first pipe assembly includes a first pipe 7, a second pipe 8, a third pipe 9 and a first tee joint 10. One end of the first pipe 7 is in communication with the through hole 5, and the other end is in communication with the first tee joint 10. One end of the second pipe 8 is in communication with the first tee joint 10, and the other end is provided with the exhaust port 4. One end of the third pipe 9 is in communication with the first tee joint 10, and the other end is provided with the first feeding port 3.

[0047] In this embodiment, the through hole 5, the first feeding port 3 and the exhaust port 4 are realized by the first pipe 7, the second pipe 8, the third pipe 9 and the first tee joint 10, avoiding the separate opening of the exhaust port 4 and the first feeding port 3 on the die body, which can easily cause interference when connecting the pipeline, so as to simplify the overall structure of the die body and improve the space utilization.

[0048] Specifically, the first pipe 7 is detachably connected with the die body through the fixing block, which is convenient for installation and disassembly.

[0049] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 The first pipe 7 is a transparent pipe.

[0050] In this embodiment, the first pipe 7 is a transparent pipe, so that the situation of the coating liquid flowing through the first pipe 7 can be directly observed. When bubbles are observed in the coating liquid flowing through the first pipe 7, it indicates that the air in the die body is not completely exhausted. When the liquid level of the coating liquid in the first pipe 7 rises and there are no bubbles, it indicates that the air in the die body is completely exhausted. Therefore, the first pipe 7 can be used to monitor the exhaust condition of the die body and ensure the exhaust effect.

[0051] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 The second pipe 8 is a transparent pipe.

[0052] In the embodiment, the second pipeline 8 is a transparent pipeline, so that the situation of the coating liquid flowing through the second pipeline 8 can be directly observed. When bubbles are observed in the coating liquid flowing through the second pipeline 8 during the emptying by feeding through the second feeding port 6, it indicates that the air in the die body is not completely emptied. When the liquid level of the coating liquid in the second pipeline 8 rises and no bubbles are observed, it indicates that the air in the die body is completely emptied. When bubbles are observed in the coating liquid flowing through the second pipeline 8 during the emptying by feeding through the first feeding port 3, it indicates that the air in the third pipeline 9 is not completely emptied. When the liquid level of the coating liquid in the second pipeline 8 rises and no bubbles are observed, it indicates that the air in the third pipeline 9 is completely emptied. Therefore, the emptying situation of the die body and the third pipeline 9 can be monitored through the second pipeline 8, so as to ensure the emptying effect.

[0053] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 , the third pipeline 9 is a transparent pipeline.

[0054] In the embodiment, the third pipeline 9 is a transparent pipeline, so that the situation of the coating liquid flowing through the third pipeline 9 can be directly observed, so as to observe whether there are bubbles in the third pipeline 9 in time, perform emptying in time, ensure the emptying effect, and further improve the coating quality.

[0055] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 2 , the communication part of the second feeding port 6 and the coating slit 2 is preset with a distance from the outlet end of the coating slit 2.

[0056] In the embodiment, the communication part of the second feeding port 6 and the coating slit 2 is preset with a distance from the outlet end of the coating slit 2. According to the actual situation, the communication part of the second feeding port 6 and the coating slit 2 can be arranged closest to the outlet end of the coating slit 2, so that when the second feeding port 6 transports the coating liquid to the coating slit 2, the coating liquid is pressed upward from the bottom as much as possible, avoiding the mixing of the downward flowing coating liquid and the rising air to form bubbles, which causes difficulty in emptying and affects the emptying effect.

[0057] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 and Figure 2 , the die body comprises a first die 11, a second die 12 and a gasket 13. The through hole 5 is arranged on the first die 11, and the second feeding port 6 is arranged on the second die 12. One side of the gasket 13 is provided with an opening 20 for discharging. The gasket 13 is clamped between the first die 11 and the second die 12, and surrounds to form the coating slit 2.

[0058] It should be noted that the first die 11 and the second die 12 are clamped to form the cavity 19, and the shape of the opening 20 is matched with the cross-sectional shape of the cavity 19 and the communication space of the coating slot 2.

[0059] In the embodiment, the die body is composed of the first die 11 and the second die 12, which has a split structure and is convenient for maintenance.

[0060] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 and Figure 2 The second feeding port 6 is provided with two, and the gasket 13 is provided with a flow guide groove 14 on both sides of the opening 20, the flow guide groove 14 is in communication with the opening 20, and the communication part of the flow guide groove 14 and the opening 20 corresponds to the position of the coating slot 2; the two second feeding ports 6 are respectively in communication with the two flow guide grooves 14.

[0061] In the embodiment, by providing the flow guide groove 14 on the gasket 13 which is in communication with the opening 20, when the gasket 13 is clamped between the first die 11 and the second die 12, the second feeding port 6 is in communication with the flow guide groove 14, so as to facilitate the communication between the second feeding port 6 and the coating slot 2, and the communication parts of the two flow guide grooves 14 and the opening 20 are symmetrically located on both sides of the opening 20, so that the coating liquid flows into the coating slot 2 from both sides of the coating slot 2 when the two second feeding ports 6 feed, and the coating slot 2 is slowly filled and the air is fully discharged, improving the emptying effect.

[0062] Specifically, the position of the two second feeding ports 6 is not specifically limited in the embodiment, as shown in Figure 4 The two second feeding ports 6 are respectively and symmetrically arranged on both sides of the second die 12 along the length direction thereof; as shown in Figure 5 The two second feeding ports 6 are respectively and symmetrically arranged on both sides of the second die 12 along the length direction thereof; as shown in

[0063] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 The two second feeding ports 6 are connected through a second pipeline assembly, and the second pipeline assembly is provided with a third feeding port 18, and the third feeding port 18 is in communication with the two second feeding ports 6.

[0064] In the embodiment, the second pipeline assembly is used to connect the two second feeding ports 6 to the third feeding port 18, and the coating liquid can be provided by the third feeding port 18 connected to the external feeding device when feeding, so as to avoid connecting the two second feeding ports 6 to the external feeding device, thereby simplifying the structure and improving the convenience.

[0065] On the basis of the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1As shown, the second pipeline assembly includes a fourth pipeline 15, a fifth pipeline 16, and a second tee joint 17; the second tee joint 17 is in communication with the two second feed ports 6 through two fourth pipelines 15; one end of the fifth pipeline 16 is in communication with the second tee joint 17, and the other end is provided with a third feed port 18.

[0066] In this embodiment, the third feed port 18 and the two second feed ports 6 are connected by using the fifth pipeline 16, the second tee joint 17, and the two fourth pipelines 15, which simplifies the overall structure and improves the space utilization.

[0067] Based on the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 As shown, the fourth pipeline 15 is a transparent pipeline.

[0068] In this embodiment, the fourth pipeline 15 is a transparent pipeline, so that the situation of the coating liquid flowing through the fourth pipeline 15 can be directly observed through the transparent pipeline, so as to observe whether there is air bubble in the fourth pipeline 15, so as to fully perform the emptying and ensure the emptying effect, thereby improving the coating quality.

[0069] Based on the above-mentioned embodiments, in a preferred embodiment, as shown in Figure 1 As shown, the fifth pipeline 16 is a transparent pipeline.

[0070] In this embodiment, the fifth pipeline 16 is a transparent pipeline, so that the situation of the coating liquid flowing through the fifth pipeline 16 can be directly observed through the transparent pipeline, so as to observe whether there is air bubble in the fifth pipeline 16, so as to fully perform the emptying and ensure the emptying effect, thereby improving the coating quality.

[0071] Specifically, as shown in Figure 1 As shown, the fourth pipeline 15 is connected with the second feed port 6 through an elbow joint, which is convenient for installation.

[0072] Based on the above-mentioned embodiments, in a preferred embodiment, a valve control assembly is further included, the first feed port 3 and the third feed port 18 are both in communication with the external feeding device through the valve control assembly, and the valve control assembly is used to control the first feed port 3 to be in communication with the external feeding device or the third feed port 18 to be in communication with the external feeding device.

[0073] In this embodiment, the first feed port 3 is controlled to be in communication with the external feeding device or the third feed port 18 is controlled to be in communication with the external feeding device through the valve control assembly, so as to realize switching and control the delivery of the coating liquid, which is convenient for control.

[0074] Specifically, the valve control assembly comprises a three-way valve, through which the first inlet 3 or the third inlet 18 is communicated with the external feeding device to realize switching and control the delivery of the coating liquid, facilitating control.

[0075] Specifically, as shown in Figure 1 , the first die head 11 and the second die head 12 are connected by fastening screws. The first die head 11 and the second die head 12 are connected by fastening screws, facilitating installation and disassembly.

[0076] Specifically, as shown in Figure 1 and Figure 6 , the width of the cavity 19 in the length direction of the die body gradually increases in the discharging direction, for example, triangular, facilitating uniform distribution of the flow of the coating liquid in the cavity 19 during delivery of the coating liquid.

[0077] The emptying step of the flat plate coating device provided in the embodiment is as follows:

[0078] (1) block the coating lip 1;

[0079] (2) open the emptying port 4, close the first inlet 3, open the second inlet 6 and deliver the coating liquid from the second inlet 6; wherein the delivery speed of the coating liquid is slow first, and when the liquid level of the coating liquid in the coating slit 2 is higher than the communication between the second inlet 6 and the coating slit 2, the speed is increased;

[0080] (3) observe the change of the liquid level in the second pipeline 8;

[0081] (4) if the liquid level in the second pipeline 8 rises and there is no air bubble in the second pipeline 8, it means that the air in the cavity 19 and the coating slit 2 is completely discharged, otherwise, the second inlet 6 continues to deliver the coating liquid;

[0082] (5) in step (4), after the air in the cavity 19 and the coating slit 2 is completely discharged, the first inlet 3 is opened and the coating liquid is delivered;

[0083] (6) continue to observe the change of the liquid level in the second pipeline 8;

[0084] (7) if the liquid level in the second pipeline 8 rises and there is no air bubble in the second pipeline 8, it means that the air in the third pipeline 9 is completely discharged, otherwise, the first inlet 3 continues to deliver the coating liquid;

[0085] (8) after the air in the third pipeline 9 is completely discharged, it means that the air in the die body, the first pipeline assembly and the second pipeline assembly is completely discharged, at this time, the first inlet 3, the second inlet 6 and the emptying port 4 are closed;

[0086] (9) After step (8), open the coating lip 1, at the same time open the first feeding port 3 and deliver the coating liquid, and then normal coating can be started.

[0087] Obviously, the above embodiments are only examples for clearly illustrating, but not limitation to the embodiments. Other different forms of changes or variations can be made on the basis of the above description for those skilled in the art. Here, all the embodiments need not and can not be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model creation.

Claims

1. A flat coating device, characterized in that: The die body comprises a die body, wherein a cavity (19) for feeding is provided in the die body, a coating lip (1) is provided on one side of the die body along its width direction, and the cavity (19) is connected to the coating lip (1) through a coating slit (2); A through hole (5) is provided on the die body on a side away from the coating lip (1), the through hole (5) is connected to the cavity (19), the through hole (5) is connected to a first pipeline assembly, the first pipeline assembly is provided with a first feed port (3) and an emptying port (4), the first feed port (3) and the emptying port (4) are both connected to the through hole (5); The die body is provided with a second feed port (6), and the second feed port (6) is communicated with the coating slit (2).

2. The flat plate coating device according to claim 1, characterized in that: The first pipeline assembly comprises a first pipeline (7), a second pipeline (8), a third pipeline (9) and a first three-way joint (10); One end of the first pipe (7) is in communication with the through hole (5), and the other end is in communication with the first three-way joint (10); One end of the second pipe (8) is in communication with the first three-way joint (10), and the other end is provided with the drain port (4); One end of the third pipe (9) is in communication with the first three-way joint (10), and the other end is provided with the first feed port (3).

3. The flat plate coating device according to claim 2, characterized in that: The first pipe (7) is a transparent pipe; And / or, the second pipe (8) is a transparent pipe; And / or, the third pipe (9) is a transparent pipe.

4. The flat plate coating device according to claim 1, characterized in that: The connection point between the second feed port (6) and the coating slit (2) is preset at a distance from the outlet end of the coating slit (2).

5. The flat plate coating device according to any one of claims 1 to 4, characterized in that: The die body comprises a first die (11), a second die (12) and a gasket (13); the through hole (5) is arranged on the first die (11), and the second feed port (6) is arranged on the second die (12); an opening (20) for discharging material is provided on one side of the gasket (13); the gasket (13) is clamped between the first die (11) and the second die (12), and encloses and forms the coating slit (2).

6. The flat plate coating device according to claim 5, characterized in that: There are two second feed ports (6), and guide grooves (14) are provided on both sides of the opening (20) on the gasket (13). The guide grooves (14) are connected to the opening (20), and the connection point between the guide grooves (14) and the opening (20) corresponds to the position of the coating slit (2); the two second feed ports (6) are respectively connected to the two guide grooves (14).

7. The flat plate coating device according to claim 6, characterized in that: The two second feed ports (6) are connected via a second pipeline assembly, and a third feed port (18) is provided on the second pipeline assembly. The third feed port (18) is connected to the two second feed ports (6).

8. The flat plate coating device according to claim 7, characterized in that: The second pipeline assembly includes a fourth pipeline (15), a fifth pipeline (16) and a second three-way connector (17); The second three-way joint (17) is connected to the two second feed ports (6) respectively through the two fourth pipes (15); One end of the fifth pipeline (16) is connected to the second three-way joint (17), and the other end is provided with the third feed port (18).

9. The flat plate coating device according to claim 8, characterized in that: The fourth pipe (15) is a transparent pipe; And / or, the fifth pipe (16) is a transparent pipe.

10. The flat plate coating device according to claim 7, characterized in that: It also includes a valve control component, wherein the first feed port (3) and the third feed port (18) are both connected to an external feeding device through the valve control component, and the valve control component is used to control whether the first feed port (3) is connected to the external feeding device or the third feed port (18) is connected to the external feeding device.

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