阅读说明：本技术 涂布机构及涂布机 (Coating mechanism and coating machine ) 是由 王德万 华永军 于 2021-07-26 设计创作，主要内容包括：本发明涉及一种涂布机构及涂布机,安装于机架上,用于基材表面的浆料涂布,其特征在于,包括：沿基材传送方向上依次间隔设置的预涂单元、匀涂单元及精涂单元,基材可依次通过预涂单元、匀涂单元及精涂单元,且在基材传送过程中,其表面浆料厚度逐渐减小；上述涂布机构,用于网孔基材的涂布,通过多次刮涂的方式使得在基材传送过程中,基材表面的浆料厚度逐渐减小,基材表面浆料涂布均匀,且浆料(尤其是超高固含量浆料)能够充分渗入至网孔内,显著提高网孔基材的涂布质量,实现在网孔基材表面均匀涂布浆料,提高产品良率。(The invention relates to a coating mechanism and a coating machine, which are arranged on a rack and used for coating slurry on the surface of a base material, and are characterized by comprising the following components: the device comprises a pre-coating unit, a uniform coating unit and a fine coating unit which are sequentially arranged at intervals in the conveying direction of a base material, wherein the base material can sequentially pass through the pre-coating unit, the uniform coating unit and the fine coating unit, and the thickness of surface slurry of the base material is gradually reduced in the conveying process of the base material; above-mentioned coating mechanism for the coating of mesh substrate makes at the substrate transfer process through the mode of many times blade coating, and the thick liquids thickness on substrate surface reduces gradually, and substrate surface thick liquids coating is even, and thick liquids (especially super high solid content thick liquids) can fully permeate to the mesh in, is showing the coating quality who improves the mesh substrate, realizes evenly coating thick liquids on mesh substrate surface, improves the product yield.)

1. A coating mechanism, mounted on a frame, for coating a slurry on a surface of a substrate, comprising:

the coating device comprises a pre-coating unit, a uniform coating unit and a fine coating unit which are sequentially arranged at intervals in the conveying direction of the base material, wherein the base material can sequentially pass through the pre-coating unit, the uniform coating unit and the fine coating unit, and the thickness of surface slurry of the base material is gradually reduced in the conveying process of the base material.

2. The coating mechanism as claimed in claim 1, wherein the precoating unit comprises a first base, a first scraper, and a first housing fixed on the first base, the first base is fixed on the frame, a first inlet and a first outlet for the substrate to pass through are formed between the first base and the first housing, the first scraper is fixed on the first housing, and an included angle between a scraper head of the first scraper and a conveying direction of the substrate is 170 ° to 180 °.

3. The coating mechanism of claim 2, wherein the precoating unit further comprises a first fine-tuning assembly and a first cylinder which are independent of each other, and the first fine-tuning assembly and the first cylinder are both fixed on the first housing and are both in transmission connection with the first scraper.

4. The coating mechanism of claim 2 wherein a planar roughness of said first base toward said first blade is less than or equal to 15 μm.

5. The coating mechanism according to claim 1, wherein the level coating unit comprises a second base, a second scraper, and a second housing fixed on the second base, the second base is fixed on the frame, a second inlet and a second outlet for the substrate to pass through are formed between the second base and the second housing, the second scraper is fixed on the second housing, and an included angle between a scraper head of the second scraper and a conveying direction of the substrate is 150 ° to 165 °.

6. The coating mechanism according to claim 5, wherein the level coating unit further comprises a second fine adjustment assembly and a second cylinder which are independent from each other, and the second fine adjustment assembly and the second cylinder are both fixed on the second housing and are both in transmission connection with the second scraper.

7. The coating mechanism of claim 5 wherein the second base has a planar roughness toward the second blade of less than or equal to 15 μm.

8. The coating mechanism according to claim 1, wherein the finish coating unit comprises a third base, a third scraper, and a third casing fixed on the third base, the third base is fixed on the frame, a third inlet and a third outlet for the substrate to pass through are formed between the third base and the third casing, the third scraper is fixed on the third casing, and an included angle between a scraper head of the third scraper and a conveying direction of the substrate is 150 ° to 165 °.

9. The coating mechanism according to claim 8, wherein the finish coating unit further comprises a third fine adjustment assembly and a third cylinder which are independent from each other, and the third fine adjustment assembly and the third cylinder are both fixed on the third housing and are both in transmission connection with the third scraper.

10. The coating mechanism of claim 8 wherein the third base has a planar roughness toward the third blade of less than or equal to 15 μm.

11. A coating machine, comprising an unwinding mechanism, a winding mechanism, a discharging assembly and the coating mechanism as claimed in any one of claims 1 to 10, wherein:

the unwinding mechanism, the coating mechanism and the winding mechanism are sequentially arranged along the conveying direction of the base material;

the unwinding mechanism comprises a first unwinding assembly and a second unwinding assembly, the first unwinding assembly is used for placing mesh base materials, the second unwinding assembly is used for placing diaphragm base materials, when the mesh base materials and the diaphragm base materials are stacked together before being conveyed to the coating mechanism, and the mesh base materials are located above the diaphragm base materials;

the discharging assembly is arranged on one side, far away from the fine coating unit, of the pre-coating unit.

12. The coater according to claim 11, further comprising an oven mechanism and a deviation correcting mechanism, wherein the oven mechanism is fixed to the frame and located between the coating mechanism and the winding mechanism, and the deviation correcting mechanism is fixed to the frame and located between the oven mechanism and the winding mechanism.

Technical Field

The invention relates to the technical field of coating equipment, in particular to a coating mechanism and a coating machine.

Background

With the development of technology, more and more new functional materials are required to be coated, and the coating technology is a high-technology processing technology for uniformly coating one or more layers of coatings with special properties on the surface of a processing material by using a special professional device and forming the material with the special properties through drying or other processing processes, and the coating technology almost covers the surface processing treatment field of most processing materials. Most of the existing coating mechanisms can only carry out full-scale coating and cannot be completely adapted to the development of all materials, and particularly, the coating mechanism is very important for coating mesh substrates in the fields of lithium batteries and super capacitors.

At present, the coating modes of slurry with ultrahigh solid content on mesh substrates are comma blade coating, but the coating modes adopting comma blade coating can only carry out blade coating once, the slurry does not completely permeate into the mesh substrates, the coating process is finished, even some slurry only permeates into one part of the mesh substrates, some slurry does not permeate, so that the coating quality of the mesh substrates is not high, uniform slurry coating on the surfaces of the mesh substrates cannot be realized, and the product yield is seriously influenced.

Disclosure of Invention

Therefore, it is necessary to provide a coating mechanism and a coater for solving the problems of uneven slurry coating and poor coating quality on a mesh substrate.

A coating mechanism, mounted on a frame, for coating a substrate surface with a slurry, comprising:

the coating device comprises a pre-coating unit, a uniform coating unit and a fine coating unit which are sequentially arranged at intervals in the conveying direction of the base material, wherein the base material can sequentially pass through the pre-coating unit, the uniform coating unit and the fine coating unit, and the thickness of surface slurry of the base material is gradually reduced in the conveying process of the base material.

Above-mentioned coating mechanism, install in the frame, a thick liquids coating for the mesh substrate, coating mechanism includes the unit of precoating that sets up along the interval in proper order in the substrate direction of transfer, even unit and the smart unit of scribbling, the mode through many times blade coating makes in the substrate transfer process, the thick liquids thickness on substrate surface reduces gradually, substrate surface thick liquids coating is even, and thick liquids (especially super high solid content thick liquids) can fully permeate to the mesh in, show the coating quality who improves the mesh substrate, realize at the even coating thick liquids of mesh substrate surface, improve the product yield.

In one embodiment, the precoating unit includes a first base, a first scraper, and a first housing fixed on the first base, the first base is fixed on the frame, a first inlet and a first outlet for the substrate to pass through are disposed between the first base and the first housing, the first scraper is fixed on the first housing, and an included angle between a scraper head of the first scraper and a conveying direction of the substrate is 170 ° to 180 °.

In one embodiment, the precoating unit further comprises a first fine adjustment assembly and a first air cylinder which are independent of each other, and the first fine adjustment assembly and the first air cylinder are both fixed on the first shell and are both in transmission connection with the first scraper.

In one embodiment, the first base has a planar roughness towards the first blade of less than or equal to 15 μm.

In one embodiment, the even coating unit includes a second base, a second scraper, and a second housing fixed on the second base, the second base is fixed on the frame, a second inlet and a second outlet for the substrate to pass through are provided between the second base and the second housing, the second scraper is fixed on the second housing, and an included angle between a scraper head of the second scraper and a conveying direction of the substrate is 150 ° to 165 °.

In one embodiment, the leveling unit further comprises a second fine adjustment assembly and a second cylinder which are independent from each other, and the second fine adjustment assembly and the second cylinder are both fixed on the second shell and are both in transmission connection with the second scraper.

In one embodiment, the second base has a planar roughness towards the second blade of less than or equal to 15 μm.

In one embodiment, the finish coating unit includes a third base, a third scraper, and a third casing fixed on the third base, the third base is fixed on the frame, a third inlet and a third outlet for the substrate to pass through are provided between the third base and the third casing, the third scraper is fixed on the third casing, and an included angle between a scraper head of the third scraper and a conveying direction of the substrate is 150 ° to 165 °.

In one embodiment, the finish coating unit further comprises a third fine adjustment assembly and a third cylinder which are independent from each other, and the third fine adjustment assembly and the third cylinder are both fixed on the third shell and are both in transmission connection with the third scraper.

In one embodiment, the third base has a planar roughness towards the third blade of less than or equal to 15 μm.

The utility model provides a coating machine, includes unwinding mechanism, winding mechanism, ejection of compact subassembly and as above any one of technical scheme coating mechanism, wherein:

the unwinding mechanism, the coating mechanism and the winding mechanism are sequentially arranged along the conveying direction of the base material;

the unwinding mechanism comprises a first unwinding assembly and a second unwinding assembly, the first unwinding assembly is used for placing mesh base materials, the second unwinding assembly is used for placing diaphragm base materials, when the mesh base materials and the diaphragm base materials are stacked together before being conveyed to the coating mechanism, and the mesh base materials are located above the diaphragm base materials;

the discharging assembly is arranged on one side, far away from the fine coating unit, of the pre-coating unit.

Above-mentioned coating machine, a thick liquids coating for the mesh substrate, unwinding mechanism, coating mechanism, winding mechanism is fixed in proper order in the frame, a conveying for the substrate, unwinding mechanism is used for placing the substrate of uncoated, coating mechanism is used for the coating of substrate, coating mechanism includes the unit of precoating that sets gradually on the substrate direction of transfer, even unit and the unit of scribbling, the mode through many times knife coating makes substrate surface thick liquids coating even, and thick liquids can fully permeate to the mesh in, especially to the thick liquids of super high solid content, thick liquids can fully permeate to the mesh in, show the coating quality who improves the mesh substrate, realize at the even coating thick liquids of mesh substrate surface, improve the product yield.

In one embodiment, the device further comprises an oven mechanism and a deviation rectifying mechanism, wherein the oven mechanism is fixed on the rack and is located between the coating mechanism and the winding mechanism, and the deviation rectifying mechanism is fixed on the rack and is located between the oven mechanism and the winding mechanism.

Drawings

FIG. 1 is a schematic structural diagram of a coater provided by the present invention;

FIG. 2 is a schematic structural diagram of a precoating unit provided by the present invention;

FIG. 3 is a schematic structural view of a level coating unit provided by the present invention;

FIG. 4 is a schematic structural diagram of a finish coating unit provided by the present invention;

fig. 5 is a schematic structural diagram of an unwinding mechanism provided in the present invention;

fig. 6 is a schematic flow chart of a coating method provided by the present invention.

Reference numerals:

100. coating machine;

110. a frame;

120. a coating mechanism; 121. a precoating unit; 122. a leveling unit; 123. a finish coating unit;

1211. a first base; 1212. a first scraper; 1213. a first housing; 1214. a first inlet; 1215. a first outlet; 1216. a first fine tuning assembly; 1217. a first cylinder;

1221. a second base; 1222. a second scraper; 1223. a second housing; 1224. a second inlet; 1225. a second outlet; 1226. a second fine tuning assembly; 1227. a second cylinder;

1231. a third base; 1232. a third scraper; 1233. a third housing; 1234. a third inlet; 1235. a third outlet; 1236. a third fine tuning assembly; 1237. a third cylinder;

130. an unwinding mechanism; 131. a first unwinding assembly; 132. a second unwinding assembly; 133. a substrate; 134. a mesh substrate; 135. a separator substrate; 136. a roller;

140. a winding mechanism;

150. a discharge assembly;

160. an oven mechanism;

170. a deviation rectifying mechanism.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical scheme provided by the embodiment of the invention is described below by combining the accompanying drawings.

As shown in fig. 1, the present invention provides a coating mechanism 120 which is mounted on a frame 110 and is used for coating slurry on a mesh substrate 134 having a recessed portion, the coating mechanism 120 comprises a pre-coating unit 121, a leveling unit 122 and a finish coating unit 123 which are sequentially arranged at intervals in the conveying direction of the substrate 133, and the thickness of the slurry on the surface of the substrate 133 is gradually reduced in the conveying process of the substrate 133. A first gap is formed between the pre-coating unit 121 and the uniform coating unit 122, and a second gap is formed between the uniform coating unit 122 and the finish coating unit 123, specifically, the size of the first gap and the size of the second gap can be specifically selected according to the specification and the type of the base material 133, the type of the coating slurry, and the like; when the depth of the mesh of the substrate 133 is large, the first gap and the second gap may be set to be large to ensure that the slurry can sufficiently permeate into the inside of the mesh; when the depth of the mesh of the substrate 133 is small, the first gap and the second gap may be set to be small, so that the slurry can be sufficiently infiltrated into the inside of the mesh of the substrate 133, and the installation space of the coating mechanism 120 can be saved.

The coating mechanism 120 is mounted on the rack 110 and used for coating the slurry of the mesh substrate 134, the coating mechanism 120 comprises a pre-coating unit 121, a uniform coating unit 122 and a fine coating unit 123 which are sequentially arranged along the conveying direction of the substrate 133 at intervals, and the thickness of the slurry on the surface of the substrate 133 is gradually reduced in the conveying process of the substrate 133 by a multi-time blade coating mode, so that the slurry on the surface of the substrate 133 is uniformly coated, and the slurry (especially the slurry with ultrahigh solid content) can fully permeate into the mesh, thereby remarkably improving the coating quality of the mesh substrate 134, realizing uniform coating of the slurry on the surface of the mesh substrate 134, and improving the yield of products.

In order to uniformly apply the slurry onto the substrate 133, in a preferred embodiment, as shown in fig. 1 and fig. 2, the pre-coating unit 121 includes a first base 1211, a first scraper 1212, and a first casing 1213, wherein the first base 1211 is fixed on the frame 110, the first casing 1213 is fixed on the first base 1211 by welding, screwing, or the like, and the first scraper 1212 is fixed on the first casing 1213 by screwing, snapping, or the like, for scraping the slurry deposited on the substrate 133. The first casing 1213 and the first base 1211 can be integrally formed by molding, pouring, or the like, and the first casing 1213 and the first base 1211 can also be fixed together by welding, it is noted that a first inlet 1214 and a first outlet 1215 are formed between the first casing 1213 and the first base 1211, through which the substrate 133 passes, and the substrate 133 enters the pre-coating unit 121 through the first inlet 1214 for blade coating, and after the blade coating is completed, the substrate is transmitted to the outside or a next process through the first outlet 1215. When the substrate 133 passes through the pre-coating unit 121, one side of the substrate 133 to be coated is opposite to the first blade 1212 at an interval, the other side opposite to the one side to be coated is in contact with the first base 1211, and the surface roughness of the first base 1211 facing the first blade 1212 is less than or equal to 15 μm, that is, the surface roughness of the first base 1211 in contact with the substrate 133 is less than or equal to 15 μm, so that the flatness of the substrate 133 can be ensured, the surface coating of the substrate 133 is more uniform, and the coating quality of the substrate 133 is improved.

In addition, the angle (α angle in fig. 2) formed between the doctor head of the first doctor blade 1212 and the transport direction of the substrate 133 is 170 ° to 180 °, specifically, the angle formed between the doctor head of the first doctor blade 1212 and the transport direction of the substrate 133 may be 170 °, 172 °, 175 °, 177 °, and 180 °, although the angle formed between the doctor head of the first doctor blade 1212 and the transport direction of the substrate 133 is not limited to the above range, and may be other values within the range of 170 ° to 180 °. Preferably, the angle between the scraper head of the first scraper 1212 and the conveying direction of the substrate 133 is 180 °, and in this case, the scraper head of the first scraper 1212 is parallel to the surface of the substrate 133, so that the slurry can be more uniformly coated on the surface of the substrate 133.

In order to make the first scraper 1212 capable of adapting to the base materials 133 with various specifications, specifically, as shown in fig. 2, the pre-coating unit 121 further includes a first fine-tuning assembly 1216 and a first cylinder 1217, the first fine-tuning assembly 1216 may be fixed on the first casing 1213 by screwing, clipping, embedding, or the like, and the first cylinder 1217 may also be fixed on the first casing 1213 by screwing, clipping, embedding, or the like. The first fine adjustment assembly 1216 and the first cylinder 1217 are independent from each other, and the first cylinder 1217 is in transmission connection with the first scraper 1212 so as to drive the first scraper 1212 to move in a direction perpendicular to the coating surface of the substrate 133, so that the first scraper 1212 can adapt to the blade coating of slurry layers with different thicknesses on the surface of the substrate 133; the first trimming assembly 1216 is in driving connection with the first scraper 1212 to drive the first scraper 1212 to adjust in a direction perpendicular to the coating surface of the substrate 133, and it should be noted that the adjustment of the first trimming assembly 1216 to the first scraper 1212 is in a micrometer level, which can improve the precision of the first scraper 1212 to the thickness of the slurry layer on the surface of the substrate 133.

In order to uniformly apply the slurry onto the substrate 133, in a preferred embodiment, as shown in fig. 1 and 3, the leveling unit 122 includes a second base 1221, a second scraper 1222, and a second housing 1223, the second base 1221 is fixed to the frame 110, the second housing 1223 is fixed to the second base 1221 by welding, screwing, or the like, and the second scraper 1222 is fixed to the second housing 1223 by screwing, clamping, or the like, for leveling the slurry deposited on the substrate 133. The second housing 1223 and the second base 1221 may be integrally formed by molding, pouring, or the like, and the second housing 1223 and the second base 1221 may also be fixed as a whole by welding, and it should be noted that a second inlet 1224 and a second outlet 1225 through which the base material 133 passes are disposed between the second housing 1223 and the second base 1221, and the base material 133 enters the uniform coating unit 122 through the second inlet 1224 to be blade-coated, and after the blade-coated base material is blade-coated, the base material is conveyed to the outside or to a next process through the second outlet 1225. When the substrate 133 passes through the level coating unit 122, one side of the substrate 133 to be coated is arranged opposite to the second blade 1222 at a distance, the other side opposite to the one side to be coated is in contact with the second base 1221, and the plane roughness of the second base 1221 facing the second blade 1222 is less than or equal to 15 μm, that is, the plane roughness of the second base 1221 in contact with the substrate 133 is less than or equal to 15 μm, so that the flatness of the substrate 133 can be ensured, the surface coating of the substrate 133 is more uniform, and the coating quality of the substrate 133 is improved.

Further, the angle (angle β in fig. 3) between the blade head of the second blade 1222 and the transport direction of the substrate 133 is 150 ° to 165 °, specifically, the angle between the blade head of the second blade 1222 and the transport direction of the substrate 133 may be 150 °, 152 °, 155 °, 157 °, 160 °, 162 °, 165 °, although the angle between the blade head of the second blade 1222 and the transport direction of the substrate 133 is not limited to the above range, and may be other values within the range of 150 ° to 165 °. The scraper head of the second scraper 1222 is set to be an inclined plane structure, downward pressure can be applied to the slurry through the scraper head of the second scraper 1222, the slurry is under the action of the pressure towards the surface of the substrate 133, and in the slurry coating process, the slurry (especially the slurry with ultrahigh solid content) can fully permeate into the meshes of the substrate 133, so that the situation that the slurry (especially the slurry with ultrahigh solid content) does not fully permeate into the meshes of the substrate 133 due to insufficient pressure is prevented, and the product yield is seriously affected. Moreover, the second scraper 1222 is preferably a slender steel knife, and because steel has good elasticity and toughness, on one hand, a certain abdicating space can be ensured when the second scraper 1222 scrapes slurry with ultra-high solid content, so that the second scraper 1222 is prevented from being in hard contact with the slurry, and the slurry is prevented from being scratched greatly in the scraping process; on the other hand, the service life of the second scraper 1222 can be extended. Of course, the second scraper 1222 is not limited to the steel blade provided above, and may also be an iron blade or other metal materials with elasticity and flexibility, and the invention is not limited thereto.

In order to enable the second scraper 1222 to be suitable for various specifications of the substrate 133, specifically, as shown in fig. 3, the level coating unit 122 further includes a second fine adjustment assembly 1226 and a second cylinder 1227, the second fine adjustment assembly 1226 may be fixed on the second housing 1223 through a screw connection, a clamping connection, an embedding connection, and the like, and the second cylinder 1227 may also be fixed on the second housing 1223 through a screw connection, a clamping connection, an embedding connection, and the like. And the second fine tuning assembly 1226 is independent of the second cylinder 1227, and the second cylinder 1227 is in driving connection with the second blade 1222 to drive the second blade 1222 to move in a direction perpendicular to the coating surface of the substrate 133, so that the second blade 1222 can be adapted to the blade coating of various slurry layers with different thicknesses on the surface of the substrate 133; the second trimming member 1226 is drivingly connected to the second blade 1222 to drive the second blade 1222 to be adjusted in a direction perpendicular to the coated surface of the substrate 133. it should be noted that the adjustment of the second trimming member 1226 to the second blade 1222 in a micrometer adjustment can improve the precision of the thickness of the slurry layer coated on the surface of the substrate 133 by the second blade 1222.

In order to uniformly coat the slurry on the substrate 133, in a preferred embodiment, as shown in fig. 1 and 4, the finish coating unit 123 includes a third base 1231, a third scraper 1232 and a third housing 1233, the third base 1231 is fixed on the frame 110, the third housing 1233 is fixed on the third base 1231 by welding, screwing, or the like, and the third scraper 1232 is fixed on the third housing 1233 by screwing, clamping, or the like, for scraping the slurry deposited on the substrate 133. The third housing 1233 and the third base 1231 may be integrally formed by molding, pouring, or the like, and the third housing 1233 and the third base 1231 may also be fixed as a whole by welding, and it should be noted that a third inlet 1234 and a third outlet 1235 through which the substrate 133 passes are disposed between the third housing 1233 and the third base 1231, and the substrate 133 enters the finish-coating unit 123 through the third inlet 1234 for blade coating, and after the blade coating is completed, the substrate is transmitted to the outside or the next process through the third outlet 1235. When the substrate 133 passes through the fine coating unit 123, one surface of the substrate 133 to be coated is opposite to the third scraper 1232 at an interval, the other surface of the substrate 1231 opposite to the one surface to be coated is in contact with the third base 1231, and the surface roughness of the third base 1231 facing the third scraper 1232 is less than or equal to 15 μm, that is, the surface roughness of the third base 1231 in contact with the substrate 133 is less than or equal to 15 μm, which can ensure the smoothness of the substrate 133, make the surface coating of the substrate 133 more uniform, and improve the coating quality of the substrate 133.

In addition, the angle (γ angle in fig. 4) formed by the doctor head of the third doctor blade 1232 and the transport direction of the substrate 133 is 150 ° to 165 °, specifically, the angle formed by the doctor head of the third doctor blade 1232 and the transport direction of the substrate 133 may be 150 °, 152 °, 155 °, 157 °, 160 °, 162 °, and 165 °, and of course, the angle formed by the doctor head of the third doctor blade 1232 and the transport direction of the substrate 133 is not limited to the above range, and may be other values within the range of 150 ° to 165 °. The scraper head of the third scraper 1232 is set to be of an inclined plane structure, downward pressure can be applied to the slurry through the scraper head of the third scraper 1232, the slurry is under the action of pressure towards the surface of the substrate 133, and in the slurry coating process, the slurry (especially the slurry with ultrahigh solid content) can be more favorably fully infiltrated into the inside of the meshes of the substrate 133, so that the situation that the slurry (especially the slurry with ultrahigh solid content) is incompletely infiltrated into the inside of the meshes of the substrate 133 due to insufficient pressure is prevented, and the product yield is seriously affected. In addition, the third scraper 1232 is preferably a long and thin iron knife, and since iron has good elasticity and toughness, on one hand, a certain abdicating space can be ensured when the third scraper 1232 scrapes the slurry with ultrahigh solid content, so that the third scraper 1232 is prevented from being in hard contact with the slurry, and the slurry is prevented from being scratched greatly in the scraping process; on the other hand, the service life of the third blade 1232 can be extended. Of course, the third scraper 1232 is not limited to the steel knife provided above, and may also be other metal materials with elasticity and flexibility, such as a steel knife, and the invention is not limited thereto.

In order to enable the third scraper 1232 to be adapted to the base materials 133 with various specifications, specifically, as shown in fig. 4, the finish coating unit 123 further includes a third fine adjustment assembly 1236 and a third cylinder 1237, the third fine adjustment assembly 1236 may be fixed to the third housing 1233 through a screw joint, a clamping joint, an embedding joint, and the like, and the third cylinder 1237 may also be fixed to the third housing 1233 through a screw joint, a clamping joint, an embedding joint, and the like. The third fine adjustment assembly 1236 and the third cylinder 1237 are independent from each other, and the third cylinder 1237 is in transmission connection with the third scraper 1232 to drive the third scraper 1232 to move in a direction perpendicular to the coating surface of the substrate 133, so that the third scraper 1232 can adapt to the blade coating of various slurry layers with different thicknesses on the surface of the substrate 133; the third fine tuning assembly 1236 is in transmission connection with the third blade 1232 to drive the third blade 1232 to adjust in a direction perpendicular to the coating surface of the substrate 133, and it should be noted that the adjustment of the third fine tuning assembly 1236 to the third blade 1232 is in a micron level, which can improve the precision of the third blade 1232 on the thickness of the slurry layer on the surface of the substrate 133.

As shown in fig. 1, fig. 2 and fig. 5, the present invention further provides a coater 100 for coating slurry on the surface of a mesh substrate 134, wherein the coater 100 includes an unwinding mechanism 130, a winding mechanism 140, a discharging assembly 150 and a coating mechanism 120 according to any one of the above technical solutions, wherein:

the unwinding mechanism 130, the coating mechanism 120 and the winding mechanism 140 are sequentially arranged along the conveying direction of the base material 133, the unwinding mechanism 130 is fixed on the rack 110 in a welding mode, a screwing mode and the like and used for placing the uncoated base material 133, a roller column 136 is arranged inside the unwinding mechanism 130, the base material 133 is placed on the roller column 136 in a winding mode, the base material 133 is discharged through rotation of the roller column 136, and the length of the base material 133 can be specifically set according to the coating requirement for the base material 133. The winding mechanism 140 is also fixed to the frame 110 by welding, screwing, or the like, and is used for winding the coated substrate 133, and similarly, the winding mechanism 140 also has a roller 136 therein, and the substrate 133 can be wound around the roller 136, and the substrate 133 can be received by the rotation of the roller 136.

In order to prevent the slurry from leaking to the frame 110 through the meshes of the substrate 133, as shown in fig. 1 and fig. 5, the unwinding mechanism 130 includes a first unwinding assembly 131 and a second unwinding assembly 132, the first unwinding assembly 131 is used for placing the mesh substrate 134, the second unwinding assembly 132 is used for placing the membrane substrate 135, and the membrane substrate 135 can receive the slurry leaking from the mesh substrate 134, so as to prevent the slurry from directly falling onto the surface of the coater 100 and damaging the coater 100. Wherein the mesh substrate 134 and the membrane substrate 135 are stacked together before being transferred to the coating mechanism 120, and the mesh substrate 134 is located above the membrane substrate 135.

In order to continuously supply the slurry to the surface of the substrate 133, as shown in fig. 2, the discharging assembly 150 is fixed on the pre-coating unit 121 by screwing, clamping, and the like, and the discharging assembly 150 is located at a side far from the finish coating unit 123, that is, the discharging assembly 150 is located at a side close to the unwinding mechanism 130, so that the slurry can be timely supplied to the substrate 133 before the substrate 133 starts to be coated. Of course, the take-off assembly 150 is also located directly on the frame 110, as long as the take-off assembly 150 is capable of supplying slurry to the surface of the substrate 133 before the substrate 133 enters the coating mechanism 120.

The coating machine 100 is used for coating slurry on the mesh substrate 134, the unreeling mechanism 130, the coating mechanism 120 and the reeling mechanism 140 are sequentially fixed on the rack 110 and used for conveying the substrate 133, the unreeling mechanism 130 is used for placing the uncoated substrate 133, the coating mechanism 120 is used for coating the substrate 133, the coating mechanism 120 comprises the pre-coating unit 121, the even-coating unit 122 and the fine-coating unit 123 which are sequentially arranged in the conveying direction of the substrate 133, slurry coating on the surface of the substrate 133 is uniform in a multi-time blade coating mode, the slurry can fully permeate into the mesh, particularly slurry with ultrahigh solid content can fully permeate into the mesh, the coating quality of the mesh substrate 134 is remarkably improved, uniform slurry coating on the surface of the mesh substrate 134 is realized, and the product yield is improved.

In order to realize the solidification and formation of the slurry on the surface of the substrate 133 and the movement of the substrate 133 according to the predetermined track, in a preferred embodiment, as shown in fig. 1, the coater 100 further includes an oven mechanism 160 and a deviation-correcting mechanism 170, the oven mechanism 160 is fixed on the frame 110 by screwing, welding, etc., and the oven mechanism 160 is located between the coating mechanism 120 and the winding mechanism 140, so that when the substrate 133 is conveyed to the oven mechanism 160 by the coating mechanism 120, the slurry on the surface of the substrate 133 can be solidified and formed at high temperature, which can accelerate the solidification and formation of the slurry on the surface of the substrate 133. The deviation rectifying mechanism 170 is fixed on the rack 110 by screwing, welding and the like, the deviation rectifying mechanism 170 is positioned between the oven mechanism 160 and the winding mechanism 140, and the deviation rectifying mechanism 170 is arranged close to the winding mechanism 140, so that the deviation phenomenon of the base material 133 in the transmission process can be avoided to the greatest extent. The deviation rectifying mechanism 170 can enable the base material 133 to always move on a preset track in the transmission process, so that the base material 133 is prevented from deviating in the transmission process, the slurry coating on the surface of part of the base material 133 is not uniform, even the slurry is not coated on the surface of part of the base material 133, the coating quality of the mesh base material 134 is improved, the uniform slurry coating on the surface of the mesh base material 134 is realized, and the product yield is improved.

In addition, the present invention also provides a coating method of the coater 100 as described above, as shown in fig. 6, the coating method includes the following steps:

step S601: the substrate 133 is wound around the unwinding mechanism 130.

The mesh substrate 134 is wound on the first unwinding assembly 131, the membrane substrate 135 is wound on the second unwinding assembly 132, and the mesh substrate 134 and the membrane substrate 135 are transferred on the frame 110 by the rotation of the roller 136. It is noted that the mesh substrate 134 is stacked together prior to transfer to the coating mechanism 120 and that the mesh substrate 134 is positioned above the membrane substrate 135.

Step S602: the substrate 133 passes through the pre-coating unit 121, the level coating unit 122, and the finish coating unit 123 in this order.

During the conveying process of the base material 133, when the base material 133 passes through the pre-coating unit 121, the first scraper 1212 scrapes the slurry on the surface of the mesh base material 134, and keeps the thickness of the surface of the slurry protruding mesh base material 134 to be 3 times to 5 times of the thickness required by the surface of the slurry protruding mesh base material 134, so as to ensure that sufficient slurry can permeate into the meshes of the mesh base material 134 during the conveying process of the base material 133. When the substrate 133 passes through the level coating unit 122, the second scraper 1222 scrapes the slurry on the surface of the mesh substrate 134, and keeps the thickness of the slurry protruding mesh substrate 134 1.1 times to 1.5 times of the required thickness of the slurry protruding mesh substrate 134, so as to ensure that the mesh of the mesh substrate 134 not filled with the slurry can be filled with sufficient slurry. When the substrate 133 passes through the finish coating unit 123, the third doctor blade 1232 performs a doctor blade coating on the slurry on the surface of the mesh substrate 134, and the thickness of the slurry protruded from the surface of the mesh substrate 134 is kept to be the required thickness of the slurry protruded from the surface of the mesh substrate 134.

Step S603: the substrate 133 passes through an oven mechanism 160 to achieve the curing and forming of the slurry on the mesh substrate 134.

Step S604: the winding mechanism 140 receives the coated substrate 133.

The coating method is used for coating the slurry of the mesh substrate 134, the substrate 133 is wound on the unwinding mechanism 130 to feed the substrate 133, the substrate 133 sequentially passes through the pre-coating unit 121, the uniform coating unit 122 and the fine coating unit 123, the slurry on the surface of the substrate 133 is uniformly coated in a multi-time blade coating mode, the slurry (especially the slurry with ultrahigh solid content) can fully permeate into the mesh, the coating quality of the mesh substrate 134 is remarkably improved, the substrate 133 is cured and molded on the mesh substrate 134 through the oven mechanism 160, and the coated substrate 133 is collected through the winding mechanism 140. The coating method is simple and convenient to operate, the process is reliable, the uniform coating of the slurry on the surface of the mesh substrate 134 can be realized, and the product yield is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.