Automatic switching filtering and feeding device and coating system

Abstract

The utility model relates to the technical field of coating and feeding, in particular to an automatic switching filtering and feeding device and a coating system. The utility model discloses an automatic switching filtering and feeding device which comprises a discharging assembly and a feeding assembly, the at least two filtering components comprise a first filtering component and a second filtering component, and the first filtering component and the second filtering component are respectively communicated with the discharging component; the material conveying assembly comprises a first power pump and a first switching valve, the first power pump is in pipeline connection with the first switching valve, the first switching valve communicates with the first filtering assembly and the second filtering assembly, and the first power pump is suitable for conveying materials to the first filtering assembly or the second filtering assembly through the first switching valve; the feeding assembly comprises a second power pump and a first feeding valve, and the first feeding valve is communicated with the second filtering assembly through a pipeline. The utility model provides an automatic switching filtering and feeding device and a coating system, which are used for solving the problem that the coating can be continued only after the machine is stopped and emptied due to the existence of air.

Description

TECHNICAL FIELD

[0001] The utility model relates to coating feed technology field, concretely relates to a filter feed device and coating system of automatic switching. BACKGROUND

[0002] In the pipeline fluid conveying field, especially in the lithium battery coating field, the pipeline fluid quality is required to be high, so multiple filtration and impurity removal are required to finally produce finished products. The flowing material conveyed has the characteristics of good quality and high value. Therefore, improving the overall pipeline conveying efficiency is extremely critical.

[0003] In the traditional pipeline fluid conveying field, the filtration and impurity removal elements increase the resistance of the fluid in the pipeline after working for a period of time due to the adsorption of certain impurities on their surfaces, so the elements need to be cleaned or replaced regularly. If the filtration and impurity removal elements are connected in series in the fluid conveying pipeline, the pipeline must be stopped for cleaning and replacement, and the pipeline can continue to run only after the replacement is completed, which is low in efficiency. In order to improve the production efficiency, the filter elements in the pipeline are widely connected in parallel in actual use, and a manual ball valve or a pneumatic ball valve is used to switch to the bypass for continuous conveying when cleaning and replacement. Although this scheme improves the conveying efficiency to a certain extent, the filter to be switched in will bring air into the filter during the previous filter element replacement process, and the presence of air in the filter will cause the coating to stop and be emptied before it can continue. SUMMARY

[0004] Therefore, the utility model provides a filter feed device and coating system of automatic switching to solve the problem that the filter to be switched in will bring air into the filter during the previous filter element replacement process, and the presence of air in the filter will cause the coating to stop and be emptied before it can continue.

[0005] In the first aspect, the utility model provides a filter feed device and coating system of automatic switching, which comprises:

[0006] a discharge assembly;

[0007] at least two filter assemblies, including a first filter assembly and a second filter assembly, the first filter assembly and the second filter assembly are respectively communicated with the discharge assembly;

[0008] The feeding assembly comprises a second power pump and a first feeding valve, the first feeding valve is communicated with the second filter assembly through a pipeline, and the second power pump is suitable for conveying the material to the second filter assembly through the first feeding valve.

[0009] The feeding assembly comprises a second power pump and a first feeding valve, the first feeding valve is communicated with the second filter assembly through a pipeline, and the second power pump is suitable for conveying the material to the second filter assembly through the first feeding valve.

[0010] In use, when the first filter assembly needs to replace the filter element itself, the first switch valve is communicated with the first filter assembly, the first switch valve is not communicated with the second filter assembly, the first power pump continues to convey the material to the first filter assembly, the second power pump drives the material to enter the second filter assembly through the first feeding valve, and the material is used to slowly discharge the air in the second filter assembly until the air in the second filter assembly is completely discharged. After the air in the second filter assembly is completely discharged, the second power pump stops working, the first switch valve is not communicated with the first filter assembly, and the first switch valve is communicated with the second filter assembly, so that the switching of the first filter assembly to the second filter assembly is realized without stopping the machine, and the working efficiency in the switching process is ensured.

[0011] In an alternative embodiment, the feeding assembly comprises a feeding pipeline, a second feeding valve, a first feeding branch and a second feeding branch, the feeding pipeline is communicated with the first feeding branch and the second feeding branch respectively, the second power pump is arranged on the feeding pipeline, the second feeding valve is arranged on the first feeding branch, the first feeding valve is arranged on the second feeding branch, one end of the first feeding branch away from the feeding pipeline is communicated with the first filter assembly, and one end of the second feeding branch away from the feeding pipeline is communicated with the second filter assembly.

[0012] In an alternative embodiment, the first filter assembly comprises a first conveying pipeline, a first filter and a first emptying valve, the first filter is arranged on the first conveying pipeline, the first filter is communicated with the first emptying valve, and the first conveying pipeline is communicated with the first feeding branch; the second filter assembly comprises a second conveying pipeline, a second emptying valve and a second filter, the second filter is arranged on the second conveying pipeline, the second filter is communicated with the second emptying valve, and the second conveying pipeline is communicated with the second feeding branch.

[0013] In an alternative embodiment, the first filtration assembly further comprises a first vent flow meter and a first filtered pressure sensor, the first vent valve is in communication with the first filter, the first vent flow meter is disposed on the first vent valve, and the first filtered pressure sensor is disposed on the first delivery conduit downstream of the first filter.

[0014] In an alternative embodiment, the second filtration assembly further comprises a second vent flow meter and a second filtered pressure sensor, the second vent flow meter is disposed on the second vent valve, and the second filtered pressure sensor is disposed on the second delivery conduit downstream of the second filter.

[0015] In an alternative embodiment, the discharge assembly comprises a second switch valve and a discharge conduit, the second switch valve is connected to the first delivery conduit, the second delivery conduit and the discharge conduit, respectively.

[0016] In an alternative embodiment, the feed assembly further comprises a feed conduit, a first air column and a pump-out pressure sensor, the first power pump, the first air column and the pump-out pressure sensor are disposed on the feed conduit, the first power pump is upstream of the pump-out pressure sensor, the first air column is downstream of the pump-out pressure sensor, the feed conduit is in communication with a first switch valve, and the discharge conduit is provided with a second air column.

[0017] In an alternative embodiment, a controller is further included, the controller is connected to the first power pump, the second power pump, the first switch valve, the second switch valve, the first feed valve, the second feed valve and the pump-out pressure sensor, respectively.

[0018] In a second aspect, the utility model further provides a coating system, including automatic switching filter feed device above.

[0019] In an alternative embodiment, a coating machine is further included, and the discharge conduit is in communication with a coating die of the coating machine.

[0020] The automatic switching filter feeding device has the following advantages: (1) the first filter switches to the second filter through "first working state→first switching state→second working state", and the second filter switches to the first filter through "second working state→second switching state→first working state", air in the corresponding filter can be discharged in the switching state through the second power pump, the influence time on normal coating during filter switching is shortened, even if in the first switching state and the second switching state, the first power pump can still drive the material to move, and the material is continuously fed into the coating die, and the non-stop switching of the filter is realized; (2) the first air column and the second air column are arranged to absorb pressure fluctuation generated during filter switching, and the influence on normal coating and the impact on the conveying pipeline and the discharge pipeline are reduced; (3) the emptying valve is arranged at the top end of the filter core, and air in the filter and the conveying pipeline is automatically discharged in the switching state. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 It is a schematic view of an automatic switching filter feeding device.

[0023] The drawings are explained as follows: 1, material conveying assembly; 101, material conveying pipeline; 102, first power pump; 103, pump outlet pressure sensor; 104, first air column; 105, first switching valve; 2, feeding assembly; 201, feeding pipeline; 202, second power pump; 203, first feeding branch; 204, second feeding valve; 205, second feeding branch; 206, first feeding valve; 3, first filter assembly; 301, first filter; 302, first emptying valve; 303, first conveying pipeline; 304, first emptying flow detection meter; 305, first post-filter pressure sensor; 4, second filter assembly; 401, second filter; 402, second emptying valve; 403, second conveying pipeline; 404, second emptying flow detection meter; 405, second post-filter pressure sensor; 5, discharge assembly; 501, second switching valve; 502, second air column; 503, discharge pipeline. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0025] Embodiment 1

[0026] The embodiments of the present application will be described below in conjunction with Figure 1

[0027] According to the embodiments of the present application, on the one hand, an automatic switching filter feeding device is provided, comprising:

[0028] a discharging assembly 5;

[0029] at least two filter assemblies, including a first filter assembly 3 and a second filter assembly 4, the first filter assembly 3 and the second filter assembly 4 being respectively in communication with the discharging assembly 5;

[0030] a feeding assembly 1, including a first power pump 102 and a first switching valve 105, the first power pump 102 being connected with the first switching valve 105 in pipeline, the first switching valve 105 being respectively in communication with the first filter assembly 3 and the second filter assembly 4, the first power pump 102 being adapted to feed the material to the first filter assembly 3 or the second filter assembly 4 through the first switching valve 105, the first filter assembly 3 being used to feed the discharging assembly 5 after filtering the impurities in the material, or the second filter assembly 4 being used to feed the discharging assembly 5 after filtering the impurities in the material;

[0031] a feeding assembly 2, the feeding assembly 2 including a second power pump 202 and a first feeding valve 206, the first feeding valve 206 being connected with the second filter assembly 4 in pipeline, the second power pump 202 being adapted to feed the material to the second filter assembly 4 through the first feeding valve 206.

[0032] ​In use, when the first filter assembly needs to replace its filter core, the first switching valve 105 is in communication with the first filter assembly 3, the first switching valve 105 is not in communication with the second filter assembly, the first power pump continues to deliver material to the first filter assembly 3, the second power pump 202 drives the material to enter the second filter assembly 4 through the first feed valve, and the material slowly discharges the air in the second filter assembly 4, until completely empty. After the air in the second filter assembly 4 is completely emptied, the second power pump 202 stops working, the first switching valve 105 is not in communication with the first filter assembly 3, the first switching valve 105 is in communication with the second filter assembly 4, and then the switching from the first filter assembly 3 to the second filter assembly 4 is realized without stopping the machine, thereby ensuring the working efficiency during the switching process. Specifically, the material is slurry applied on the surface of the pole piece, the first power pump 102 is a screw pump, and the second power pump 202 is a peristaltic pump.

[0033] In one embodiment, as shown in Figure 1 The feed assembly 2 includes a feed pipeline 201, a second feed valve 204, a first feed branch 203 and a second feed branch 205, the feed pipeline 201 is in communication with the first feed branch 203 and the second feed branch 205 respectively, the second power pump 202 is arranged on the feed pipeline 201, the second feed valve 204 is arranged on the first feed branch 203, the first feed valve 206 is arranged on the second feed branch 205, and the end of the first feed branch 203 away from the feed pipeline 201 is in communication with the first filter assembly 3, and the end of the second feed branch 205 away from the feed pipeline 201 is in communication with the second filter assembly 4. The second power pump 202 delivers the material to the first feed branch 203 and the second feed branch 205 respectively, the second feed valve 204 controls the opening and closing of the first feed branch 203, and the first feed valve 206 controls the opening and closing of the second feed branch 205.

[0034] In one embodiment, as shown in Figure 1As shown, the first filter assembly 3 includes a first conveying pipe 303, a first filter 301, and a first vent valve 302. The first filter 301 is installed on the first conveying pipe 303 and is connected to the first vent valve 302. The first conveying pipe 303 is also connected to the first feed branch 203. The second filter assembly 4 includes a second conveying pipe 403, a second vent valve 402, and a second filter 401. The second filter 401 is installed on the second conveying pipe 403 and is connected to the second vent valve 402. The second conveying pipe 403 is also connected to the second feed branch 205. Material from the first feed branch 203 is fed into the first conveying pipe 303, and the first vent valve 302 is opened to vent the gas in the first filter 301 and the first conveying pipe 303. Similarly, material from the second feed branch 205 is fed into the second conveying pipe 403, and the second vent valve 402 is opened to vent the gas in the second filter 401 and the second conveying pipe 403.

[0035] In one embodiment, such as Figure 1 As shown, the first filter assembly 3 also includes a first vent valve 302, a first vent flow meter 304, and a first post-filter pressure sensor 305. The first vent valve 302 is connected to the first filter 301. The first vent valve 302 is equipped with the first vent flow meter 304, and the first post-filter pressure sensor 305 is equipped with the first conveying pipe 303. The first post-filter pressure sensor 305 is located downstream of the first filter 301. The first vent valve 302 is used to vent air from the first filter 301. The first vent flow meter 304 is used to monitor residual gas in the first vent valve 302. After detecting material flow, the first vent flow meter 304 closes the first vent valve 302. At the same time, the first post-filter pressure sensor 305 detects the pressure of the material after it flows through the first filter 301.

[0036] In one embodiment, such as Figure 1 As shown, the second filter assembly 4 also includes a second vent flow meter 404 and a second post-filter pressure sensor 405. The second vent valve 402 is equipped with the second vent flow meter 404, and the second delivery pipe 403 is equipped with the second post-filter pressure sensor 405. The second post-filter pressure sensor 405 is located downstream of the second filter 401. The second vent flow meter 404 monitors the residual gas in the second vent valve 402. After detecting material outflow, the second vent flow meter 404 closes the second vent valve 402. Simultaneously, the second post-filter pressure sensor 405 detects the pressure of the material after it flows through the second filter 401.

[0037] In one embodiment, such as Figure 1As shown, it also includes a discharge assembly 5, which includes a second switching valve 501 and a discharge pipe 503. The second switching valve 501 is connected to the first conveying pipe 303, the second conveying pipe 403, and the discharge pipe 503, respectively. By switching via the second switching valve 501, the first conveying pipe 303 can be connected to the discharge pipe 503, or the second conveying pipe 403 can be connected to the discharge pipe 503.

[0038] In one embodiment, such as Figure 1 As shown, the material conveying assembly 1 also includes a material conveying pipe 101, a first air column 104, and a pump pressure sensor 103. The material conveying pipe 101 is equipped with a first power pump 102, the first air column 104, and the pump pressure sensor 103. The first power pump 102 is located upstream of the pump pressure sensor 103, and the first air column 104 is located downstream of the pump pressure sensor 103. The material conveying pipe 101 is connected to a first switching valve 105, and a second air column 502 is provided on the discharge pipe 503. The air column can absorb pressure fluctuations generated during filter switching, reducing the impact on normal coating and the impact on the conveying pipe and the discharge pipe 503. Specifically, the first switching valve 105 is a three-way valve, which is connected to the material conveying pipe 101, the first conveying pipe 303, and the second conveying pipe 403, respectively. The first switching valve 105 enables the connection between the material conveying pipe 101 and the first conveying pipe 303, or between the material conveying pipe 101 and the second conveying pipe 403. It should be noted that upstream and downstream in this application refer to the flow direction of the material. The first power pump 102 is located upstream of the pump pressure sensor 103, which means that the material first passes through the first power pump 102 and then flows through the pump pressure sensor 103, so that the material passes through the first power pump 102, the pump pressure sensor 103, and the first air column 104 in sequence before entering the first switching valve 105.

[0039] In this embodiment, as Figure 1 As shown, in order to save on pipelines, the feed pipe 201 is connected to the conveying pipe 101, and the connection point between the feed pipe 201 and the conveying pipe 101 is located upstream of the first power pump 102.

[0040] In one embodiment, a controller is further included, which is connected with the first power pump 102, the second power pump 202, the first switch valve 105, the second switch valve 501, the first feed valve 206, the second feed valve 204, the pump-out pressure sensor 103, the second vent valve 402, the first vent valve 302, the first vent flow detection meter, the second vent flow detection meter 404, the first filtered pressure sensor 305, and the second filtered pressure sensor 405, respectively, to realize automatic control. Specifically, the first switch valve 105 and the second switch valve 501 are electrically operated three-way switch ball valves, the first feed valve 206 and the second feed valve 204 are electrically operated ball valves, and the second vent valve 402 and the first vent valve 302 are electrically operated vent valves.

[0041] A coating system comprising the above-mentioned automatically switched filter feed device further comprises a coating machine, and the discharge pipeline 503 is connected with a coating die of the coating machine to provide material for the coating die.

[0042] A method for using the automatically switched filter feed device, which comprises a first working state, a first switching state, a second working state, and a second switching state. The first power pump 102 is always in an open state:

[0043] In the first working state, the first switch valve 105 connects the feed pipeline 101 with the first conveying pipeline 303, the second switch valve 501 connects the first conveying pipeline 303 with the discharge pipeline 503, the second power pump 202 is closed, the first feed valve 206, the second vent valve 402, the first vent valve 302, and the second feed valve 204 are closed, and the material enters the coating die through the feed pipeline 201, the first conveying pipeline 303, the first filter 301, and the discharge pipeline 503. Since the impurities in the material continuously accumulate in the first filter 301, the first filter 301 is blocked, which leads to a continuous rise of the outlet pressure of the first power pump 102 until the conveying pressure in the feed pipeline 101 reaches a preset value monitored by the pump-out pressure sensor 103, and the system switches to the first switching state.

[0044] In the first switching state, the conveying pressure reaches the preset value, the second power pump 202 is started, the material stops flowing in the first conveying pipeline 303, the first feeding valve 206 and the first emptying valve 302 are closed, the second feeding valve 204 and the second emptying valve 402 are opened, part of the material continues to enter the first conveying pipeline 303 under the driving of the first power pump 102, and another part of the material enters the second filter 401 after entering the second conveying pipeline 403 through the feeding pipeline 201 and the second feeding branch 205, and the air in the second filter 401 and the second conveying pipeline 403 is continuously discharged until the second emptying flow detection meter 404 detects that the material flows out of the second emptying valve 402, the second emptying valve 402 is closed, at the same time, the second filtered pressure sensor 405 senses the pressure in the second conveying pipeline 403, and when the pressure sensed by the second filtered pressure sensor 405 is the same as the pressure value sensed by the first filtered pressure sensor 305, the second feeding valve 204 is closed, the second power pump 202 stops working, and the switching is switched to the second working state;

[0045] In the second working state, the filter element in the first filter 301 is replaced, at the same time, the first switching valve 105 is actuated to communicate the feeding pipeline 201 and the second conveying pipeline 403, the second switching valve 501 is actuated to communicate the second conveying pipeline 403 and the discharging pipeline 503, the second power pump 202 is closed, the first feeding valve 206, the second emptying valve 402, the first emptying valve 302 and the second feeding valve 204 are closed, the material enters the coating die through the feeding pipeline 201, the second conveying pipeline 403, the second filter 401 and the discharging pipeline 503, and since the impurities in the material continuously accumulate in the second filter 401, the second filter 401 is blocked, which causes the outlet pressure of the first power pump 102 to continuously rise until the pump outlet pressure sensor 103 detects that the conveying pressure in the feeding pipeline 101 reaches the preset value, and the switching is switched to the second switching state;

[0046] In the second switching state, the delivery pressure reaches the preset value, the second power pump 202 is started, the material stops flowing in the second delivery pipeline 403, the second feed valve 204 and the second emptying valve 402 are closed, the first feed valve 206 and the first emptying valve 302 are opened, part of the material continues to enter the second delivery pipeline 403 under the drive of the first power pump 102, and the other part of the material enters the first filter 301 after entering the first delivery pipeline 303 from the feed pipeline 201 and the first feed branch 203 under the drive of the second power pump 202. With the continuous entry of the material, the air in the first filter 301 and the first delivery pipeline 303 is continuously discharged until the first emptying flow detection meter 304 detects that the material flows out of the first emptying valve 302, and the first emptying valve 302 is closed. At the same time, the first filtered pressure sensor 305 senses the pressure in the first delivery pipeline 303, and when the pressure sensed by the first filtered pressure sensor 305 is the same as the pressure value sensed by the second filtered pressure sensor 405, the first feed valve 206 is closed, and the second power pump 202 stops working, and switches to the first working state. Thus, the state switching of "first working state→first switching state→second working state→second switching state→first working state→first switching state……" is realized.

[0047] Embodiment 2

[0048] In this embodiment, the number of filter assemblies is at least three, that is, in addition to the first filter assembly 3 and the second filter assembly 4, a third filter assembly, a fourth filter assembly, … are further included. Taking the third filter assembly as an example, the structure of the first filter assembly 3 and the second filter assembly 4 of the present application is exactly the same as that of embodiment 1, the third filter assembly includes a third filter, a third emptying valve, a third delivery pipeline, a third emptying flow detection meter and a third filtered pressure sensor. The feed assembly 2 includes a third feed branch, the feed assembly 1 includes a third switching valve, and the discharge assembly 5 includes a fourth switching valve. Among them, the third feed branch is connected with the third delivery pipeline, the third switching valve is connected with the feed pipeline 101, the second delivery pipeline 403 and the third delivery pipeline respectively, the fourth switching valve is connected with the second delivery pipeline 403, the third delivery pipeline and the discharge pipeline 503 respectively, the third filter is arranged on the third delivery pipeline, and the third filtered pressure sensor is arranged downstream of the third filter, and the third filter assembly has a third working state and a third switching state, thereby forming a cycle of "first working state→first switching state→second working state→second switching state→third working state→third switching state→first working state……". It should be noted that the first power pump 102 in the third working state and the third switching state is still in the opened state.

[0049] As an alternative embodiment, the first power pump 102 can also be a peristaltic pump, a diaphragm pump, or other kinds of pumps, and the second power pump 202 can also be a screw pump, a diaphragm pump, or other kinds of pumps.

[0050] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes are intended to fall within the scope of the appended claims.

Claims

1. An automatically switching filter feeding device, characterized in that, include: Discharge assembly (5); At least two filter components, including a first filter component (3) and a second filter component (4), wherein the first filter component (3) and the second filter component (4) are respectively connected to the discharge component (5); The material conveying assembly (1) includes a first power pump (102) and a first switching valve (105). The first power pump (102) is connected to the first switching valve (105) by pipeline. The first switching valve (105) is connected to the first filter assembly (3) and the second filter assembly (4) respectively. The first power pump (102) is adapted to convey the material through the first switching valve (105) to the first filter assembly (3) or the second filter assembly (4). The first filter assembly (3) is used to filter impurities in the material and then convey it to the discharge assembly (5). Alternatively, the second filter assembly (4) is used to filter impurities in the material and then convey it to the discharge assembly (5). The feeding assembly (2) includes a second power pump (202) and a first feed valve (206). The first feed valve (206) is connected to the second filter assembly (4) through a pipeline. The second power pump (202) is adapted to deliver material to the second filter assembly (4) through the first feed valve (206).

2. The automatically switching filter feeding device according to claim 1, characterized in that, The feeding assembly (2) includes a feeding pipe (201), a second feeding valve (204), a first feeding branch (203), and a second feeding branch (205). The feeding pipe (201) is connected to the first feeding branch (203) and the second feeding branch (205) respectively. The feeding pipe (201) is equipped with a second power pump (202). The first feeding branch (203) is equipped with a second feeding valve (204). The second feeding branch (205) is equipped with a first feeding valve (206). The end of the first feeding branch (203) away from the feeding pipe (201) is connected to the first filter assembly (3). The end of the second feeding branch (205) away from the feeding pipe (201) is connected to the second filter assembly (4).

3. The automatically switching filter feeding device according to claim 2, characterized in that, The first filter assembly (3) includes a first conveying pipe (303), a first filter (301), and a first vent valve (302). The first filter (301) is provided on the first conveying pipe (303), and the first filter (301) is connected to the first vent valve (302). The first conveying pipe (303) is connected to the first feed branch (203). The second filter assembly (4) includes a second conveying pipe (403), a second vent valve (402), and a second filter (401). The second filter (401) is provided on the second conveying pipe (403), and the second filter (401) is connected to the second vent valve (402). The second conveying pipe (403) is connected to the second feed branch (205).

4. The automatically switching filter feeding device according to claim 3, characterized in that, The first filter assembly (3) further includes a first vent flow meter (304) and a first post-filter pressure sensor (305). The first vent valve (302) is connected to the first filter (301). The first vent valve (302) is equipped with the first vent flow meter (304). The first delivery pipe (303) is equipped with the first post-filter pressure sensor (305). The first post-filter pressure sensor (305) is located downstream of the first filter (301).

5. The automatically switching filter feeding device according to claim 3, characterized in that, The second filter assembly (4) further includes a second vent flow meter (404) and a second post-filter pressure sensor (405). The second vent valve (402) is provided with the second vent flow meter (404), and the second delivery pipe (403) is provided with the second post-filter pressure sensor (405). The second post-filter pressure sensor (405) is located downstream of the second filter (401).

6. The automatically switching filter feeding device according to any one of claims 3-5, characterized in that, The discharge assembly (5) includes a second switching valve (501) and a discharge pipe (503), wherein the second switching valve (501) is connected to the first conveying pipe (303), the second conveying pipe (403) and the discharge pipe (503) respectively.

7. The automatically switching filter feeding device according to claim 6, characterized in that, The material conveying assembly (1) further includes a material conveying pipe (101), a first air column (104), and a pump pressure sensor (103). The material conveying pipe (101) is equipped with a first power pump (102), the first air column (104), and the pump pressure sensor (103). The first power pump (102) is located upstream of the pump pressure sensor (103), and the first air column (104) is located downstream of the pump pressure sensor (103). The material conveying pipe (101) is connected to a first switching valve (105), and the discharge pipe (503) is equipped with a second air column (502).

8. The automatically switching filter feeding device according to claim 7, characterized in that, It also includes a controller, which is connected to the first power pump (102), the second power pump (202), the first switching valve (105), the second switching valve (501), the first feed valve (206), the second feed valve (204), and the pump outlet pressure sensor (103) respectively.

9. A coating system, characterized in that, Includes the automatically switching filter feeding device as described in any one of claims 1-8.

10. The coating system according to claim 9, characterized in that, It also includes a coating machine, wherein the discharge pipe (503) is connected to the coating die head of the coating machine.

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