A double-return double-gap coating valve device

Abstract

The present invention discloses a double-return double-gap coating valve device, which includes a first return valve assembly, a second return valve assembly and a coating valve assembly. Both the first return valve assembly and the second return valve assembly have a feed inlet, a discharge outlet and a return port. The coating valve assembly has a discharge outlet and two feed inlets. The feed inlet of the first return valve assembly and the feed inlet of the second return valve assembly are used to connect to a feeding mechanism. The discharge outlet of the first return valve assembly is communicated with the first feed inlet of the coating valve assembly, and the discharge outlet of the second return valve assembly is communicated with the second feed inlet of the coating valve assembly. The return ports of the first return valve assembly and the second return valve assembly are both used to connect to a return mechanism, and the discharge outlet of the coating valve assembly is used to be communicated with the coating die head of a coater. This double-return double-gap coating valve device has the advantages of simple structure, easy implementation, stable and reliable performance, and convenient operation, and can improve the coating quality and the production quality of lithium batteries during actual application.

Description

Technical Field

[0001] The present invention relates to the field of coating of lithium batteries, in particular to a double-return double-gap coating valve device. Background Art

[0002] With the development and maturity of technology, lithium batteries are increasingly widely used in life and production. In the field of lithium battery production, due to the need to improve the performance of lithium batteries, especially large-capacity power batteries, which are composed of many small batteries connected in series or parallel, the requirement for the performance consistency of a single battery is very high. As the most critical coating link affecting battery performance, the quality of coating directly affects the capacity of the battery. And the pneumatic gap coating valve is a device for controlling the coating length and the thickness at the head and tail of the coating, which plays a very important role in the coating quality of the entire coating machine.

[0003] However, the existing pneumatic gap coating valves have technical defects such as complex structure, difficult assembly, high manufacturing cost, and insufficient control accuracy. It is difficult to adjust for different coating thicknesses and coating lengths during application, and it is also difficult to meet the requirement of thinning accuracy of coating thickness at the head and tail of the coating, which affects the coating quality and further affects the production quality of the battery.

[0004] All these defects seriously limit the further development and popularization application in this field.

[0005] In view of this, the purpose of the present invention is to provide a new technical solution to solve the existing technical defects. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a double-return double-gap coating valve device, which solves the technical defects existing in the prior art such as complex structure, difficult implementation, high implementation cost, inconvenient operation, poor control accuracy, and slow response.

[0007] The technical solution adopted by the present invention to solve its technical problems is:

[0008] A double-return double-gap coating valve device includes a first return valve assembly, a second return valve assembly, and a coating valve assembly. Both the first return valve assembly and the second return valve assembly have a feed inlet, a discharge outlet, and a return outlet. The coating valve assembly has a discharge outlet and two feed inlets. The feed inlets of the first return valve assembly and the second return valve assembly are used to connect to a feeding mechanism. The discharge outlet of the first return valve assembly is communicated with the first feed inlet of the coating valve assembly, and the discharge outlet of the second return valve assembly is communicated with the second feed inlet of the coating valve assembly. The return outlets of the first return valve assembly and the second return valve assembly are both used to connect to a return mechanism. The discharge outlet of the coating valve assembly is used to be communicated with the coating die head of the coating machine.

[0009] As an improvement of the above technical solution, the first reflux valve assembly includes a first reflux valve body and a first reflux valve driving device arranged at the lower part of the first reflux valve body. A first reflux valve stem and a first reflux valve spool arranged on the first reflux valve stem are installed inside the first reflux valve body. A first feed inlet, a first discharge outlet and a first reflux outlet which are communicated with each other are arranged on the first reflux valve body. The output end of the first reflux valve driving device is connected to the end of the first reflux valve stem and can drive the first reflux valve stem and the first reflux valve spool to move inside the first reflux valve body. Further, the first reflux valve spool can control the connection or disconnection between the first feed inlet and the first reflux outlet, and the first discharge outlet is communicated with the first feed inlet of the coating valve assembly.

[0010] As a further improvement of the above technical solution, the first discharge outlet of the first reflux valve assembly and the first feed inlet of the coating valve assembly are fixedly connected by a first intermediate clamp, and a first intermediate sealing ring is arranged between the first discharge outlet and the first feed inlet of the coating valve assembly; a first upper connection part of the first reflux valve is arranged at the upper part of the first reflux valve body, the first reflux outlet is arranged on the first upper connection part of the first reflux valve, the first upper connection part of the first reflux valve is fixedly connected to the upper part of the first reflux valve body by a first upper clamp of the first reflux valve, and a first upper sealing ring of the first reflux valve is arranged between the first upper connection part of the first reflux valve and the first reflux valve body.

[0011] As a further improvement of the above technical solution, the first reflux valve stem is in sealing fit with the internal space of the first reflux valve body through a first internal sealing ring of the first reflux valve; a first driving device mounting seat is arranged at the lower part of the first reflux valve body, and the first reflux valve driving device is mounted on the first driving device mounting seat; the output end of the first reflux valve driving device is connected to the lower end of the first reflux valve stem through a first floating joint of the first reflux valve.

[0012] As a further improvement of the above technical solution, the second reflux valve assembly includes a second reflux valve body and a second reflux valve driving device arranged at the lower part of the second reflux valve body. A second reflux valve stem and a second reflux valve spool arranged on the second reflux valve stem are installed inside the second reflux valve body. A second feed inlet, a second discharge outlet and a second reflux outlet which are communicated with each other are arranged on the second reflux valve body. The output end of the second reflux valve driving device is connected to the end of the second reflux valve stem and can drive the second reflux valve stem and the second reflux valve spool to move inside the second reflux valve body. Further, the second reflux valve spool can control the connection or disconnection between the second feed inlet and the second reflux outlet, and the second discharge outlet is communicated with the second feed inlet of the coating valve assembly.

[0013] As a further improvement of the above technical solution, the second discharge port of the second reflux valve assembly is fixedly connected to the second feed port of the coating valve assembly through a second intermediate clamp, and a second intermediate sealing ring is provided between the second discharge port and the second feed port of the coating valve assembly; a second upper connection part of the second reflux valve is provided on the upper part of the second reflux valve body, the second reflux port is provided on the second upper connection part of the second reflux valve, the second upper connection part of the second reflux valve is fixedly connected to the upper part of the second reflux valve body through a second upper clamp of the second reflux valve, and a second upper sealing ring of the second reflux valve is provided between the second upper connection part of the second reflux valve and the second reflux valve body.

[0014] As a further improvement of the above technical solution, the valve stem of the second reflux valve is in sealed cooperation with the internal space of the second reflux valve body through an internal sealing ring of the second reflux valve; a second driving device mounting seat is provided at the lower part of the second reflux valve body, and the second reflux valve driving device is mounted on the second driving device mounting seat; the output end of the second reflux valve driving device is connected to the lower end of the valve stem of the second reflux valve through a second reflux valve floating joint.

[0015] As a further improvement of the above technical solution, the coating valve assembly includes a coating valve body and a coating valve driving device provided at the lower part of the coating valve body. A coating valve stem and a coating valve core provided on the coating valve stem are installed inside the coating valve body. A first feed port, a second feed port and a discharge port of the coating valve which are communicated with each other are provided on the coating valve body. The output end of the coating valve driving device is connected to the end of the coating valve stem and can drive the coating valve stem and the coating valve core to move inside the coating valve body. Further, the coating valve core can control the communication or disconnection between the first feed port, the second feed port and the discharge port of the coating valve. The first feed port of the coating valve is communicated with the discharge port of the first reflux valve assembly, and the second feed port of the coating valve is communicated with the discharge port of the second reflux valve assembly.

[0016] As a further improvement of the above technical solution, a coating valve upper connection part is provided on the upper part of the coating valve body, the discharge port of the coating valve is provided on the coating valve upper connection part, the coating valve upper connection part is fixedly connected to the upper part of the coating valve body through a coating valve upper clamp, and a coating valve upper sealing ring is provided between the coating valve upper connection part and the coating valve body; the coating valve stem is in sealed cooperation with the internal space of the coating valve body through an internal sealing ring of the coating valve; a coating valve driving device mounting seat is provided at the lower part of the coating valve body, and the coating valve driving device is mounted on the coating valve driving device mounting seat; the output end of the coating valve driving device is connected to the lower end of the coating valve stem through a coating valve floating joint.

[0017] As a further improvement of the above technical solution, the feed ports of the first reflux valve assembly and the second reflux valve assembly are respectively fixedly connected with a first feed branch pipe and a second feed branch pipe. An inlet three-way joint is arranged between the first feed branch pipe and the second feed branch pipe. The third interface of the inlet three-way joint is connected with a feed main pipe, and the feed main pipe and the third interface of the inlet three-way joint are fixedly connected through a feed connection clamp. The reflux ports of the first reflux valve assembly and the second reflux valve assembly are respectively fixedly connected with a first reflux branch pipe and a second reflux branch pipe. A reflux three-way joint is arranged between the first reflux branch pipe and the second reflux branch pipe. The third interface of the reflux three-way joint is connected with a reflux main pipe, and the reflux main pipe and the third interface of the reflux three-way joint are fixedly connected through a reflux connection clamp. A first manual diaphragm valve and a second manual diaphragm valve are respectively installed on the first reflux branch pipe and the second reflux branch pipe. The discharge port of the coating valve assembly is fixedly connected with a die head feed main pipe, and the die head feed main pipe and the discharge port of the coating valve assembly are fixedly connected through a coating valve discharge connection clamp. The coating valve assembly supplies materials to the coating die head of the coater through the die head feed main pipe.

[0018] The beneficial effects of the present invention are as follows: The present invention provides a double-reflux double-gap coating valve device. The double-reflux double-gap coating valve device is composed of a first reflux valve assembly, a second reflux valve assembly and a coating valve assembly. When applied to a coater, through the coordinated operation of the first reflux valve assembly, the second reflux valve assembly and the coating valve assembly, it has the advantages of simple structure, low implementation cost, stable and reliable performance, high control accuracy and high action efficiency. It can effectively reduce the production cost and improve the coating quality, further improve the production quality of lithium batteries, and the production efficiency of enterprises is better.

[0019] In summary, the double-reflux double-gap coating valve device solves the technical defects of the prior art, such as complex structure, difficult implementation, high implementation cost, inconvenient operation, poor control accuracy and slow response. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following further illustrates the present invention with reference to the drawings and embodiments.

[0021] Figure 1 is the assembly schematic diagram of the present invention;

[0022] Figure 2 is another assembly schematic diagram of the present invention;

[0023] Figure 3 is the third assembly schematic diagram of the present invention;

[0024] Figure 4 is Figure 3 the cross-sectional view in the A-A direction of Detailed implementation manners

[0025] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. Each technical feature in the present invention can be interactively combined on the premise of not conflicting with each other. Refer to Figures 1-4 .

[0026] A double - reflux double - gap coating valve device, comprising a first reflux valve assembly 1, a second reflux valve assembly 2 and a coating valve assembly 3. Both the first reflux valve assembly 1 and the second reflux valve assembly 2 have a feed inlet, a discharge outlet and a reflux outlet. The coating valve assembly 3 has a discharge outlet and two feed inlets. The feed inlets of the first reflux valve assembly 1 and the second reflux valve assembly 2 are used to connect to a feeding mechanism. The discharge outlet of the first reflux valve assembly 1 is communicated with the first feed inlet of the coating valve assembly 3, and the discharge outlet of the second reflux valve assembly 2 is communicated with the second feed inlet of the coating valve assembly 3. The reflux outlets of the first reflux valve assembly 1 and the second reflux valve assembly 2 are both used to connect to a reflux mechanism. The discharge outlet of the coating valve assembly 3 is used to connect to the coating die head of a coating machine. A first feed branch pipe 71 and a second feed branch pipe 72 are respectively fixedly connected to the feed inlets of the first reflux valve assembly 1 and the second reflux valve assembly 2. An inlet three - way joint 73 is arranged between the first feed branch pipe 71 and the second feed branch pipe 72. A third interface of the inlet three - way joint 73 is connected to a feed main pipe 74. The feed main pipe 74 and the third interface of the inlet three - way joint 73 are fixedly connected by a feed connection clamp 75. A first reflux branch pipe 81 and a second reflux branch pipe 82 are respectively fixedly connected to the reflux outlets of the first reflux valve assembly 1 and the second reflux valve assembly 2. A reflux three - way joint 83 is arranged between the first reflux branch pipe 81 and the second reflux branch pipe 82. A third interface of the reflux three - way joint 83 is connected to a reflux main pipe 84. The reflux main pipe 84 and the third interface of the reflux three - way joint 83 are fixedly connected by a reflux connection clamp 85. A first manual diaphragm valve 86 and a second manual diaphragm valve 87 are respectively installed on the first reflux branch pipe 81 and the second reflux branch pipe 82. A die head feed main pipe 91 is fixedly connected to the discharge outlet of the coating valve assembly 3. The die head feed main pipe 91 and the discharge outlet of the coating valve assembly 3 are fixedly connected by a coating valve discharge connection clamp 92. The coating valve assembly 3 supplies materials to the coating die head of the coating machine through the die head feed main pipe 91.

[0027] Preferably, the first reflux valve assembly 1 includes a first reflux valve body 11 and a first reflux valve driving device 12 disposed at the lower part of the first reflux valve body 11. A first reflux valve stem 13 and a first reflux valve spool 14 disposed on the first reflux valve stem 13 are installed inside the first reflux valve body 11. A first feed port 15, a first discharge port 16, and a first reflux port 17 that communicate with each other are provided on the first reflux valve body 11. The output end of the first reflux valve driving device 12 is connected to the end of the first reflux valve stem 13 and can drive the first reflux valve stem 13 and the first reflux valve spool 14 to move inside the first reflux valve body 11. Further, the first reflux valve spool 14 can control the communication or disconnection between the first feed port 15 and the first reflux port 17, and the first discharge port 16 communicates with the first feed port of the coating valve assembly 3; the first discharge port 16 of the first reflux valve assembly 1 is fixedly connected to the first feed port of the coating valve assembly 5 through a first intermediate clamp 41, and a first intermediate sealing ring 42 is provided between the first discharge port 16 and the first feed port of the coating valve assembly 3; a first reflux valve upper connecting portion 18 is provided at the upper part of the first reflux valve body 11, the first reflux port 17 is provided on the first reflux valve upper connecting portion 18, the first reflux valve upper connecting portion 18 is fixedly connected to the upper part of the first reflux valve body 11 through a first reflux valve upper clamp 43, and a first reflux valve upper sealing ring 44 is provided between the first reflux valve upper connecting portion 18 and the first reflux valve body 11; the first reflux valve stem 13 is in sealing fit with the internal space of the first reflux valve body 11 through a first reflux valve internal sealing ring 131; a first driving device mounting seat 19 is provided at the lower part of the first reflux valve body 11, and the first reflux valve driving device 12 is installed on the first driving device mounting seat 19; the output end of the first reflux valve driving device 12 is connected to the lower end of the first reflux valve stem 13 through a first reflux valve floating joint 121.

[0028] Preferably, the second reflux valve assembly 2 includes a second reflux valve body 21 and a second reflux valve driving device 22 provided at the lower part of the second reflux valve body 21. A second reflux valve stem 23 and a second reflux valve spool 24 provided on the second reflux valve stem 23 are installed inside the second reflux valve body 21. A second feed port 25, a second discharge port 26 and a second reflux port 27 which are interconnected are provided on the second reflux valve body 21. The output end of the second reflux valve driving device 22 is connected to the end of the second reflux valve stem 23 and can drive the second reflux valve stem 23 and the second reflux valve spool 24 to move inside the second reflux valve body 21. Further, the second reflux valve spool 24 can control the connection or disconnection between the second feed port 25 and the second reflux port 27. The second discharge port 26 is connected to the second feed port of the coating valve assembly 3; the second discharge port 26 of the second reflux valve assembly 2 and the second feed port of the coating valve assembly 3 are fixedly connected by a second intermediate clamp 51, and a second intermediate sealing ring 52 is provided between the second discharge port 26 and the second feed port of the coating valve assembly 3; a second reflux valve upper connecting part 28 is provided at the upper part of the second reflux valve body 21. The second reflux port 27 is provided on the second reflux valve upper connecting part 28. The second reflux valve upper connecting part 28 is fixedly connected to the upper part of the second reflux valve body 21 by a second reflux valve upper clamp 53, and a second reflux valve upper sealing ring 54 is provided between the second reflux valve upper connecting part 28 and the second reflux valve body 21; the second reflux valve stem 23 is in sealing fit with the internal space of the second reflux valve body 21 through a second reflux valve internal sealing ring 231; a second driving device mounting seat 29 is provided at the lower part of the second reflux valve body 21. The second reflux valve driving device 22 is installed on the second driving device mounting seat 29; the output end of the second reflux valve driving device 22 is connected to the lower end of the second reflux valve stem 23 through a second reflux valve floating joint 221.

[0029] Preferably, the coating valve assembly 3 includes a coating valve body 31 and a coating valve driving device 32 disposed at the lower part of the coating valve body 31. A coating valve stem 33 and a coating valve spool 34 disposed on the coating valve stem 33 are installed inside the coating valve body 31. A coating valve first feed port 35, a coating valve second feed port 36 and a coating valve discharge port 37 which are communicated with each other are provided on the coating valve body 31. The output end of the coating valve driving device 32 is connected to the end of the coating valve stem 33 and can drive the coating valve stem 33 and the coating valve spool 34 to move inside the coating valve body 31. Further, the coating valve spool 34 can control the communication or disconnection between the coating valve first feed port 35, the coating valve second feed port 36 and the coating valve discharge port 37. The coating valve first feed port 35 is communicated with the discharge port of the first reflux valve assembly 1, and the coating valve second feed port 36 is communicated with the discharge port of the second reflux valve assembly 2. A coating valve upper connecting part 38 is provided at the upper part of the coating valve body 31. The coating valve discharge port 37 is provided on the coating valve upper connecting part 38. The coating valve upper connecting part 38 is fixedly connected to the upper part of the coating valve body 31 through a coating valve upper clamp 61. A coating valve upper sealing ring 62 is provided between the coating valve upper connecting part 38 and the coating valve body 31. The coating valve stem 33 is in sealing cooperation with the internal space of the coating valve body 31 through a coating valve internal sealing ring 331. A coating valve driving device mounting seat 39 is provided at the lower part of the coating valve body 31. The coating valve driving device 32 is installed on the coating valve driving device mounting seat 39. The output end of the coating valve driving device 32 is connected to the lower end of the coating valve stem 33 through a coating valve floating joint 321.

[0030] When specifically implementing the present invention, the slurry feeding mechanism of the coater is connected to the feed main pipe 74. The slurry flows into the first feed branch pipe 71 and the second feed branch pipe 72 from the feed main pipe 74 and further enters the first reflux valve assembly 1 and the second reflux valve assembly 2. The slurry inside the first reflux valve assembly 1 enters the coating valve assembly 3 through the first discharge port 16 and the first reflux valve feed port 35. The slurry inside the second reflux valve assembly 2 enters the coating valve assembly 3 through the second discharge port 26 and the second coating valve feed port 36. Through the driving actions of the first reflux valve driving device 12, the second reflux valve driving device 22 and the coating valve driving device 32, and in cooperation with the first manual diaphragm valve 86 and the second manual diaphragm valve 87, the on-off of the feed ports, discharge ports and reflux ports of the first reflux valve assembly 1, the second reflux valve assembly 2 and the coating valve assembly 3 can be controlled. Furthermore, the coating thickness when the coater coats different gaps can be controlled, and the technical requirements of head and tail thinning required for coating can be quickly achieved, so that the coating thickness and length are controlled within the required accuracy, which is flexible to use and convenient to operate. Further, the coating quality can be improved, the production quality of lithium batteries can be improved, the production efficiency is increased, and the production cost is reduced.

[0031] The slurry flowing back from the first reflux valve assembly 1 flows into the reflux main pipe 84 through the first reflux port 17, the first reflux branch pipe 81 and the reflux three-way joint 83. The slurry flowing back from the second reflux valve assembly 2 flows into the reflux main pipe 84 through the second reflux port 27, the second reflux branch pipe 82 and the reflux three-way joint 83. Further, the refluxed slurry flows back to the slurry reflux recovery mechanism through the reflux main pipe 84 for reuse.

[0032] The first reflux valve driving device 12, the second reflux valve driving device 22 and the coating valve driving device 32 can be driving cylinders, screw motors or motor-screw combination devices. In this embodiment, the first reflux valve driving device 12, the second reflux valve driving device 22 and the coating valve driving device 32 are all cylinder devices.

[0033] The above is a specific description of the preferred embodiment of the present invention. However, the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A double-reflux double-gap coating valve device, characterized in that: The invention comprises a first reflux valve assembly (1), a second reflux valve assembly (2) and a coating valve assembly (3), wherein the first reflux valve assembly (1) and the second reflux valve assembly (2) both have a feed port, a discharge port and a reflux port, and the coating valve assembly (3) has a discharge port and two feed ports, the feed port of the first reflux valve assembly (1) and the feed port of the second reflux valve assembly (2) are used to connect to a feeding mechanism, the discharge port of the first reflux valve assembly (1) is communicated with the first feed port of the coating valve assembly (3), the discharge port of the second reflux valve assembly (2) is communicated with the second feed port of the coating valve assembly (3), the reflux ports of the first reflux valve assembly (1) and the second reflux valve assembly (2) are both used to connect to the reflux mechanism, and the discharge port of the coating valve assembly (3) is used to communicate with the coating die head of the coating machine.

2. A double-reflux double-gap coating valve device according to claim 1, characterized in that: The first return valve assembly (1) includes a first return valve body (11) and a first return valve driving device (12) arranged at the lower part of the first return valve body (11); a first return valve stem (13) and a first return valve valve core (14) arranged on the first return valve stem (13) are installed inside the first return valve body (11); a first feed port (15), a first discharge port (16) and a first return port (17) which are interconnected are provided on the first return valve body (11); the output end of the first return valve driving device (12) is connected to the end of the first return valve stem (13) and can drive the first return valve stem (13) and the first return valve valve core (14) to move inside the first return valve body (11); further, the first return valve valve core (14) can control the first feed port (15) to be connected or disconnected with the first return port (17); the first discharge port (16) is connected to the first feed port of the coating valve assembly (3).

3. A double-reflux double-gap coating valve device according to claim 2, characterized in that: The first discharge port (16) of the first return valve assembly (1) is fixedly connected to the first feed port of the coating valve assembly (5) via a first intermediate clamp (41), and a first intermediate sealing ring (42) is provided between the first discharge port (16) and the first feed port of the coating valve assembly (3); a first return valve upper connecting portion (18) is provided on the upper portion of the first return valve body (11), the first return port (17) is provided on the first return valve upper connecting portion (18), the first return valve upper connecting portion (18) is fixedly connected to the upper portion of the first return valve body (11) via a first return valve upper clamp (43), and a first return valve upper sealing ring (44) is provided between the first return valve upper connecting portion (18) and the first return valve body (11).

4. The double-reflux double-gap coating valve device according to claim 2, characterized in that: The first return valve stem (13) is sealed and matched with the internal space of the first return valve body (11) through the first return valve internal sealing ring (131); a first drive device mounting seat (19) is provided at the lower part of the first return valve body (11), and the first return valve drive device (12) is mounted on the first drive device mounting seat (19); the output end of the first return valve drive device (12) is connected to the lower end of the first return valve stem (13) through the first return valve floating joint (121).

5. The double-reflux double-gap coating valve device according to claim 1, characterized in that: The second return valve assembly (2) comprises a second return valve body (21) and a second return valve driving device (22) arranged at the lower part of the second return valve body (21); a second return valve stem (23) and a second return valve valve core (24) arranged on the second return valve stem (23) are installed inside the second return valve body (21); the second return valve body (21) is provided with a second feed port (25), a second discharge port (26) and a second return valve core (24) which are interconnected. The second reflux port (27) is connected to the end of the second reflux valve stem (23) and can drive the second reflux valve stem (23) and the second reflux valve core (24) to move inside the second reflux valve body (21). Furthermore, the second reflux valve core (24) can control the second feed port (25) to be connected or disconnected from the second reflux port (27). The second discharge port (26) is connected to the second feed port of the coating valve assembly (3).

6. The double-reflux double-gap coating valve device according to claim 5, characterized in that: The second discharge port (26) of the second return valve assembly (2) is fixedly connected to the second feed port of the coating valve assembly (3) through a second intermediate clamp (51), and a second intermediate sealing ring (52) is provided between the second discharge port (26) and the second feed port of the coating valve assembly (3); a second return valve upper connecting portion (28) is provided on the upper part of the second return valve body (21), and the second return port (27) is provided on the second return valve upper connecting portion (28), and the second return valve upper connecting portion (28) is fixedly connected to the upper part of the second return valve body (21) through a second return valve upper clamp (53), and a second return valve upper sealing ring (54) is provided between the second return valve upper connecting portion (28) and the second return valve body (21).

7. The double-reflux double-gap coating valve device according to claim 5, characterized in that: The second return valve stem (23) is sealed with the internal space of the second return valve body (21) through the second return valve internal sealing ring (231); a second drive device mounting seat (29) is provided at the lower part of the second return valve body (21), and the second return valve drive device (22) is mounted on the second drive device mounting seat (29); the output end of the second return valve drive device (22) is connected to the lower end of the second return valve stem (23) through the second return valve floating joint (221).

8. The double-reflux double-gap coating valve device according to claim 1, characterized in that: The coating valve assembly (3) includes a coating valve body (31) and a coating valve driving device (32) arranged at the lower part of the coating valve body (31); a coating valve stem (33) and a coating valve core (34) arranged on the coating valve stem (33) are installed inside the coating valve body (31); a first coating valve feed port (35), a second coating valve feed port (36) and a coating valve discharge port (37) that are interconnected are provided on the coating valve body (31); the feed port of the coating valve driving device (32) is connected to the feed port of the coating valve. The outlet end is connected to the end of the coating valve stem (33) and can drive the coating valve stem (33) and the coating valve core (34) to move inside the coating valve body (31). Further, the coating valve core (34) can control the first coating valve feed port (35), the second coating valve feed port (36) and the coating valve outlet (37) to be connected or disconnected. The first coating valve feed port (35) is connected to the outlet of the first reflux valve assembly (1), and the second coating valve feed port (36) is connected to the outlet of the second reflux valve assembly (2).

9. The double-reflux double-gap coating valve device according to claim 7, characterized in that: The coating valve body (31) is provided with a coating valve upper connecting portion (38), the coating valve discharge port (37) is provided on the coating valve upper connecting portion (38), the coating valve upper connecting portion (38) is fixedly connected to the upper portion of the coating valve body (31) through a coating valve upper clamp (61), and a coating valve upper sealing ring (62) is provided between the coating valve upper connecting portion (38) and the coating valve body (31); the coating valve stem (33) is sealed with the internal space of the coating valve body (31) through the internal sealing ring (331) of the coating valve; a coating valve drive device mounting seat (39) is provided at the lower part of the coating valve body (31), and the coating valve drive device (32) is mounted on the coating valve drive device mounting seat (39); the output end of the coating valve drive device (32) is connected to the lower end of the coating valve stem (33) through the coating valve floating joint (321).

10. The double-reflux double-gap coating valve device according to claim 7, characterized in that: The feed port of the first reflux valve assembly (1) and the feed port of the second reflux valve assembly (2) are respectively fixedly connected to a first feed branch pipe (71) and a second feed branch pipe (72); a feed tee joint (73) is provided between the first feed branch pipe (71) and the second feed branch pipe (72); the third interface of the feed tee joint (73) is connected to a feed main pipe (74); the feed main pipe (74) and the third interface of the feed tee joint (73) are fixedly connected via a feed connection clamp (75); the reflux port of the first reflux valve assembly (1) and the reflux port of the second reflux valve assembly (2) are respectively fixedly connected to a first reflux branch pipe (81) and a second reflux branch pipe (82); the first reflux branch pipe (81) and the second reflux branch pipe (82) are connected to each other; (82) is provided with a reflux three-way joint (83), the third interface of the reflux three-way joint (83) is connected to a reflux main pipe (84), the reflux main pipe (84) and the third interface of the reflux three-way joint (83) are fixedly connected by a reflux connecting clamp (85), and the first reflux branch pipe (81) and the second reflux branch pipe (82) are respectively installed with a first manual diaphragm valve (86) and a second manual diaphragm valve (87); the discharge port of the coating valve assembly (3) is fixedly connected to a die head feed main pipe (91), the die head feed main pipe (91) and the discharge port of the coating valve assembly (3) are fixedly connected by a coating valve discharge connecting clamp (92), and the coating valve assembly (3) supplies material to the coating die of the coating machine through the die head feed main pipe (91).

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