Pre-coating device

Abstract

The utility model discloses a pre-coating device. The pre-coating device comprises a mounting bracket, a pre-coating roller and a cleaning assembly, the pre-coating roller is rotatably arranged on the mounting bracket and is used for adhering coating liquid extruded by the coating head. The cleaning assembly comprises a first nozzle, a first scraper, a second scraper, a second nozzle and a third scraper which are sequentially arranged in the circumferential direction of the pre-coating roller, the first nozzle and the second nozzle both face the pre-coating roller and are used for spraying cleaning liquid to the pre-coating roller, and the first scraper, the second scraper and the third scraper are all used for removing the cleaning liquid and / or coating liquid on the pre-coating roller. Wherein the third scraper can do reciprocating motion in the axial direction of the pre-coating roller so as to reduce a gap between the third scraper and the pre-coating roller and ensure that the third scraper can scrape off cleaning liquid and / or coating liquid on the pre-coating roller, and therefore it is ensured that when the pre-coating roller rotates to the position corresponding to the coating head, the surface of the pre-coating roller is kept clean and tidy, and the pre-coating effect is improved; and therefore, the coating uniformity and quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coating equipment, in particular to a pre-coating device. Background Art

[0002] Perovskite solar cells belong to the third generation of solar cells. Perovskite solar cells have the advantages of high photoelectric conversion efficiency, low production cost, simple preparation process, high flexibility, etc., and are widely used in the fields of photovoltaic power generation, electric vehicles, electronic devices, etc.

[0003] During the production process of perovskite solar cells, it is necessary to coat a perovskite solution on a substrate through a coating head to form a perovskite film layer. The uniformity of the perovskite solution coating will affect the photoelectric conversion efficiency of the perovskite solar cell. In the actual production process, the perovskite solution extruded by the coating head at the beginning is uneven each time. Usually, the coating head needs to be pre-coated on a pre-coating device and then coated on the substrate to ensure the coating uniformity. In the prior art, after the coating head is pre-coated on the pre-coating roller of the pre-coating device, the cleaning component of the pre-coating device needs to clean the pre-coating roller to ensure that the surface of the pre-coating roller remains clean when it rotates to the position corresponding to the coating head. However, the scraping blade of the cleaning component is made of a relatively soft material and is prone to deformation. Moreover, the scraping blade will also deform after long-term use, resulting in a gap between the scraping blade and the surface of the pre-coating roller, so that the scraping blade cannot completely clean the surface of the pre-coating roller, thus reducing the pre-coating effect, and even contaminating the coating head, thereby reducing the coating uniformity.

[0004] How to improve the pre-coating effect of the pre-coating device is a difficult problem that needs to be solved urgently. Summary of the Invention

[0005] The purpose of the utility model is to provide a pre-coating device, which can reduce or avoid the gap between the scraping blade and the surface of the pre-coating roller, so as to ensure that the scraping blade can scrape off the cleaning liquid and / or coating liquid on the pre-coating roller, thereby ensuring that the surface of the pre-coating roller remains clean when it rotates to the position corresponding to the coating head, further improving the pre-coating effect, and at the same time avoiding contaminating the coating head, thereby improving the coating uniformity and quality.

[0006] The purpose of the utility model is achieved by adopting the following technical solutions:

[0007] A pre-coating device, comprising:

[0008] An installation bracket;

[0009] A pre-coating roller, the pre-coating roller is rotatably arranged on the installation bracket, and the pre-coating roller is used for attaching the coating liquid extruded by the coating head;

[0010] Cleaning assembly, the cleaning assembly includes a first nozzle, a first scraper, a second scraper, a second nozzle and a third scraper arranged in sequence along the circumferential direction of the precoating roll. The first nozzle and the second nozzle are both oriented towards the precoating roll and are used to spray cleaning liquid onto the precoating roll. The first scraper, the second scraper and the third scraper are all used to remove the cleaning liquid and / or the coating liquid on the precoating roll;

[0011] Wherein, the third scraper can reciprocate along the axial direction of the precoating roll to reduce the gap between the third scraper and the precoating roll.

[0012] Preferably, the mounting bracket includes a bottom wall, a first side wall and a second side wall arranged oppositely, and a third side wall and a fourth side wall arranged oppositely. The bottom wall, the first side wall, the second side wall, the third side wall and the fourth side wall enclose a receiving space, and at least part of the precoating roll is arranged in the receiving space.

[0013] Preferably, a first hollowed-out part is provided on the second side wall. The second nozzle and the third scraper are arranged on a first mounting plate, and the first mounting plate is detachably arranged on the second side wall. When the first mounting plate is not arranged on the second side wall, the second scraper can be disassembled and installed through the first hollowed-out part.

[0014] Preferably, the first nozzle is arranged at a position near the middle of the first side wall, and the number of the first nozzles is multiple. The multiple first nozzles are evenly distributed along the axial direction of the precoating roll;

[0015] The second nozzle is arranged at a position near the middle and lower part of the second side wall, and the number of the second nozzles is multiple. The multiple second nozzles are evenly distributed along the axial direction of the precoating roll.

[0016] Preferably, the first scraper is arranged at the connection between the first side wall and the bottom wall, and the first scraper is slidably connected to the outer peripheral surface of the precoating roll;

[0017] The second scraper is arranged at the connection between the second side wall and the bottom wall, and the second scraper is slidably connected to the outer peripheral surface of the precoating roll;

[0018] The third scraper is arranged at a position near the middle and upper part of the second side wall, and the third scraper is slidably connected to the outer peripheral surface of the precoating roll.

[0019] Preferably, a top plate is provided at the tops of the first side wall and the second side wall. An opening extending along the axial direction of the precoating roll is provided on the top plate, and part of the precoating roll is exposed from the opening.

[0020] Preferably, it further includes a first driving mechanism for driving the third squeegee to reciprocate axially along the precoating roller; and / or,

[0021] It further includes a second driving mechanism for driving the precoating roller to rotate circumferentially along the rotation axis of the precoating roller.

[0022] Preferably, the number of the first driving mechanisms is two. The third squeegee is arranged on a slide rail, and the two first driving mechanisms are respectively arranged at both ends of the slide rail. The first driving mechanism is used for driving the slide rail to reciprocate axially along the precoating roller, and the slide rail can drive the third squeegee to reciprocate axially along the precoating roller.

[0023] Preferably, a first connecting shaft and a second connecting shaft are respectively arranged at both ends of the precoating roller, and at least one of them is connected to the second driving mechanism.

[0024] Preferably, the first squeegee, the second squeegee and the third squeegee are all made of elastic materials, and the precoating roller is made of stainless steel.

[0025] Compared with the prior art, the beneficial effects of the present utility model at least include:

[0026] In the precoating device of the present utility model, by reciprocating the third squeegee axially along the precoating roller, the gap between the third squeegee and the surface of the precoating roller can be reduced or avoided, so as to ensure that the third squeegee can scrape off the cleaning liquid and / or coating liquid on the precoating roller, thereby ensuring that when the precoating roller rotates to the position corresponding to the coating head, the surface of the precoating roller remains clean, further improving the precoating effect, and at the same time avoiding contaminating the coating head, thereby improving the coating uniformity and quality. Description of the Drawings

[0027] Figure 1 is an exploded schematic view of the precoating device according to an embodiment of the present utility model.

[0028] Figure 2 is a three-dimensional structural schematic view of the precoating device according to an embodiment of the present utility model.

[0029] Figure 3 is a planar structural schematic view of the precoating device according to an embodiment of the present utility model.

[0030] Figure 4 is Figure 3 a sectional schematic view along the A-A direction.

[0031] In the figure: 100, precoating device; 1, mounting bracket; 11, bottom wall; 111, first support frame; 112, second support frame; 12, first side wall; 121, second hollow part; 122, second mounting plate; 13, second side wall; 131, first hollow part; 132, first mounting plate; 133, slide rail; 14, third side wall; 141, first support plate; 15, fourth side wall; 151, second support plate; 16, accommodating space; 17, top plate; 171, opening; 2, precoating roller; 21, first end; 22, second end; 23, first connecting shaft; 24, second connecting shaft; 3, cleaning assembly; 31, first nozzle; 32, first scraper; 33, second scraper; 34, second nozzle; 35, third scraper; 4, first driving mechanism; 5, second driving mechanism. Detailed implementation manners

[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this utility model will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their repeated description will be omitted.

[0033] The words expressing positions and directions described in this utility model are all illustrated with reference to the accompanying drawings, but can be changed according to needs, and all the changes made are included in the protection scope of this utility model.

[0034] Referring to Figures 1 to 4 , this utility model provides a precoating device 100, including: a mounting bracket 1, a precoating roller 2, and a cleaning assembly 3. The precoating roller 2 and the cleaning assembly 3 are arranged on the mounting bracket 1, and the cleaning assembly 3 is arranged around the precoating roller 2 and is used for cleaning the precoating roller 2.

[0035] Specifically, the installation bracket 1 is integrally a hollow cuboid. The installation bracket 1 may include a bottom wall 11, a first side wall 12 and a second side wall 13 which are oppositely arranged, and a third side wall 14 and a fourth side wall 15 which are oppositely arranged. The first side wall 12, the second side wall 13, the third side wall 14 and the fourth side wall 15 may be respectively arranged around the bottom wall 11. The first side wall 12, the second side wall 13, the third side wall 14 and the fourth side wall 15 are respectively perpendicular or approximately perpendicular to the bottom wall 11. The first side wall 12 and the second side wall 13 are parallel or approximately parallel to each other. The third side wall 14 and the fourth side wall 15 are parallel or approximately parallel to each other. The bottom wall 11, the first side wall 12, the second side wall 13, the third side wall 14 and the fourth side wall 15 may enclose to form a receiving space 16. The tops of the first side wall 12 and the second side wall 13 may be provided with a top plate 17. An opening 171 extending along the axial direction of the pre-coating roller 2 is provided on the top plate 17. A part of the pre-coating roller 2 is exposed from the opening 171. The top plate 17 can prevent the cleaning liquid from leaving the receiving space 16, avoiding the pollution of the coating head (not shown) and the working environment by the cleaning liquid.

[0036] The pre-coating roller 2 is integrally a cylinder. The pre-coating roller 2 is rotatably arranged on the installation bracket 1 and is used for attaching the coating liquid extruded by the coating head. In this embodiment, at least a part of the pre-coating roller 2 is arranged in the receiving space 16 and is used for attaching the coating liquid extruded by the coating head. The pre-coating roller 2 is preferably made of stainless steel, and stainless steel has the characteristics of corrosion resistance and high strength, which can ensure that the pre-coating roller 2 can work stably for a long time. The length of the pre-coating roller 2 is preferably greater than or equal to the length of the coating head, which can ensure that all the coating liquid extruded during the pre-coating of the coating head can be attached to the pre-coating roller 2, thereby improving the pre-coating effect of the coating head. The length of the pre-coating roller 2 is preferably greater than the length of the coating head, so that the accuracy requirement for the coating head to align with the pre-coating roller 2 can be reduced, and further ensuring that all the coating liquid extruded during the pre-coating of the coating head can be attached to the pre-coating roller 2. The length of the pre-coating roller 2 is less than or equal to the length of the installation bracket 1, that is, the length of the pre-coating roller 2 is less than or equal to the length of the receiving space 16, so that the pre-coating roller 2 can be completely located in the receiving space 16 in the length direction, ensuring that the coating liquid attached to the pre-coating roller 2 will not flow outside the receiving space 16. In some embodiments, when the pre-coating device 100 is arranged at both ends of the coating head, the pre-coating roller 2 is only used for attaching the coating liquid extruded at both ends of the coating head, and the length of the pre-coating roller 2 can be less than the length of the coating head.

[0037] Refer to Figure 1, the pre - coating roller 2 has opposite first end 21 and second end 22. The first end 21 and the second end 22 of the pre - coating roller 2 can be respectively provided with a first connecting shaft 23 and a second connecting shaft 24. And the first connecting shaft 23 and the second connecting shaft 24 respectively pass through the third side wall 14 and the fourth side wall 15. The first connecting shaft 23 and the second connecting shaft 24 are respectively rotatably connected to the third side wall 14 and the fourth side wall 15. At the same time, the third side wall 14 and the fourth side wall 15 have a certain supporting effect on the pre - coating roller 2, improving the stability of the rotation of the pre - coating roller 2. In some embodiments, the first connecting shaft 23 and the second connecting shaft 24 can also be respectively arranged on the third side wall 14 and the fourth side wall 15 through a first support plate 141 and a second support plate 151. The first connecting shaft 23 and the second connecting shaft 24 are respectively rotatably connected to the first support plate 141 and the second support plate 151.

[0038] In some embodiments, referring to Figure 1 , Figure 2 , on the outer sides of the first end 21 and the second end 22 of the pre - coating roller 2, a first support frame 111 and a second support frame 112 can be respectively arranged. The first connecting shaft 23 and the second connecting shaft 24 are respectively rotatably connected to the first support frame 111 and the second support frame 112. In this way, the stability of the pre - coating roller 2 is further improved, and then the pre - coating effect of the coating head is improved. In this embodiment, the first support frame 111 and the second support frame 112 can be arranged on the bottom wall 11 of the mounting bracket 1.

[0039] Referring to Figure 4, the cleaning assembly 3 may include a first nozzle 31, a first blade 32, a second blade 33, a second nozzle 34, and a third blade 35 arranged in sequence along the circumferential direction of the pre - coating roller 2. Both the first nozzle 31 and the second nozzle 34 face the pre - coating roller 2 and are used to spray cleaning liquid onto the pre - coating roller 2. The cleaning liquid can make the coating liquid more easily fall off from the pre - coating roller 2. The first blade 32, the second blade 33, and the third blade 35 are all slidably connected to the pre - coating roller 2, and the first blade 32, the second blade 33, and the third blade 35 are all used to remove the cleaning liquid and / or coating liquid on the pre - coating roller 2, so that when the pre - coating roller 2 rotates to the corresponding position of the coating head, the surface of the pre - coating roller 2 remains clean. The first nozzle 31 sprays the cleaning liquid on the pre - coating roller 2 for the first time. The first blade 32 is used to remove the cleaning liquid and coating liquid on the pre - coating roller 2 for the first time. The second blade 33 is used to remove the remaining cleaning liquid and coating liquid on the pre - coating roller 2 after being cleaned by the first blade 32, further removing the cleaning liquid and coating liquid on the pre - coating roller 2. The second nozzle 34 sprays the cleaning liquid on the pre - coating roller 2 for the second time. The third blade 35 is used to remove the cleaning liquid and / or coating liquid on the pre - coating roller 2 for the third time. The first blade 32, the second blade 33, and the third blade 35 are all made of an elastic material. The elastic material can be PTFE material. The PTFE material has corrosion resistance and wear resistance, which extends the service life of the first blade 32, the second blade 33, and the third blade 35. The PTFE material also has a certain toughness and elasticity, which can fit onto the pre - coating roller 2, and can better remove the cleaning liquid and / or coating liquid on the pre - coating roller 2.

[0040] The distribution direction of the first nozzle 31, the first blade 32, the second blade 33, the second nozzle 34, and the third blade 35 arranged in sequence along the circumferential direction of the pre - coating roller 2 is the same as the rotation direction of the pre - coating roller 2. That is to say, when the pre - coating roller 2 rotates clockwise, the distribution direction of the first nozzle 31, the first blade 32, the second blade 33, the second nozzle 34, and the third blade 35 arranged in sequence along the circumferential direction of the pre - coating roller 2 is clockwise. When the pre - coating roller 2 rotates counter - clockwise, the distribution direction of the first nozzle 31, the first blade 32, the second blade 33, the second nozzle 34, and the third blade 35 arranged in sequence along the circumferential direction of the pre - coating roller 2 is counter - clockwise. In this way, the pre - coating roller 2 with attached coating liquid can be cleaned in the preset order of the cleaning assembly 3, ensuring that the pre - coating roller 2 is cleaned thoroughly, avoiding the remaining cleaning liquid and / or coating liquid on the pre - coating roller 2, which may affect the pre - coating effect, and also avoiding the cleaning liquid from contaminating the coating head. In this embodiment, the pre - coating roller 2 rotates counter - clockwise, and the distribution direction of the first nozzle 31, the first blade 32, the second blade 33, the second nozzle 34, and the third blade 35 arranged in sequence along the circumferential direction of the pre - coating roller 2 is counter - clockwise. In this application, this is taken as an example for illustration.

[0041] To ensure the coating quality of the coating head, the coating head needs to be pre-coated before coating the substrate assembly (not shown) with the coating liquid. The coating head moves above the pre-coating device 100, that is, above the pre-coating roller 2. The coating head extrudes the coating liquid towards the rotating pre-coating roller 2. The coating liquid can be a perovskite solution. The rotating pre-coating roller 2 can carry away the uneven coating liquid until the coating liquid extruded by the coating head is uniform. The cleaning assembly 3 can remove the coating liquid on the pre-coating roller 2 to ensure that the position corresponding to the coating head on the pre-coating roller 2 always remains clean. The distance from the coating head to the pre-coating roller 2 is preferably equal to or approximately equal to the thickness of the coating liquid coated on the substrate assembly. After the coating head performs pre-coating in this way, the uniformity of coating the coating liquid on the substrate assembly by the coating head is further improved, thereby improving the photoelectric conversion efficiency of the perovskite solar cell.

[0042] By cleaning the pre-coating roller 2 through the cleaning assembly 3, it is ensured that the position corresponding to the coating head on the pre-coating roller 2 remains clean, thereby ensuring the effect of pre-coating by the coating head, and thus ensuring the coating quality. Moreover, the pre-coating device 100 of the present application does not require manual cleaning, ensuring that the coating head can operate continuously and improving the production efficiency of the coating equipment.

[0043] Due to the characteristics of the materials of the first scraper 32, the second scraper 33 and the third scraper 35, it is difficult to ensure the straightness of the first scraper 32, the second scraper 33 and the third scraper 35. In actual work, when there are gaps between the first scraper 32, the second scraper 33 and the third scraper 35 and the surface of the pre-coating roller 2 and they cannot be completely fitted, there is a situation where the surface of the pre-coating roller 2 cannot be completely scraped clean locally. In this way, the effect of pre-coating is reduced, and even the coating head may be contaminated, thereby reducing the coating uniformity. To ensure that the surface of the pre-coating roller 2 remains clean when the pre-coating roller 2 rotates to the position corresponding to the coating head, at least the third scraper 35 can reciprocate axially along the pre-coating roller 2 to reduce the gap between the third scraper 35 and the pre-coating roller 2. In the present application, by reciprocating the third scraper 35 axially along the pre-coating roller 2, the gap between the third scraper 35 and the surface of the pre-coating roller 2 can be reduced or avoided, so as to ensure that the third scraper 35 can scrape off the cleaning liquid and / or coating liquid on the pre-coating roller 2, thereby ensuring that the surface of the pre-coating roller 2 remains clean when the pre-coating roller 2 rotates to the position corresponding to the coating head, thereby improving the effect of pre-coating, and at the same time avoiding contaminating the coating head, thereby improving the coating uniformity and quality. In some embodiments, the first scraper 32 and the second scraper 33 can also reciprocate axially along the pre-coating roller 2 to reduce the gaps between the first scraper 32 and the second scraper 33 and the pre-coating roller 2.

[0044] In a specific embodiment, a first hollowed-out portion 131 may be provided on the second side wall 13. The second nozzle 34 and the third squeegee 35 may be disposed on the first mounting plate 132, and the first mounting plate 132 is detachably disposed on the second side wall 13. That is to say, the second nozzle 34 and the third squeegee 35 can be first mounted on the first mounting plate 132, and then the first mounting plate 132 can be mounted on the second side wall 13. In this way, the second nozzle 34, the third squeegee 35 and the first mounting plate 132 can be integrally installed and disassembled, improving work efficiency. Of course, the first mounting plate 132 can also be first mounted on the second side wall 13, and then the second nozzle 34 and the third squeegee 35 can be mounted on the first mounting plate 132. In some embodiments, the second nozzle 34 and the third squeegee 35 can also be directly mounted on the second side wall 13.

[0045] When the first mounting plate 132 is not disposed on the second side wall 13, the second squeegee 33 can be disassembled and installed through the first hollowed-out portion 131. In particular, when the second squeegee 33 is worn out during long-term operation and needs to be replaced and repaired, the second squeegee 33 is disassembled and installed through the first hollowed-out portion 131 without removing the pre-coating roller 2. This not only ensures the accuracy of the position of the pre-coating roller 2, and the position of the pre-coating roller 2 can remain unchanged, but also avoids operations such as leveling and calibration of the pre-coating roller 2, saving a lot of time and improving the operating efficiency of the equipment.

[0046] Preferred mode, referring to Figure 4 , the first nozzle 31 is preferably disposed at a position close to the middle of the first side wall 12, that is, the first nozzle 31 is disposed at a position close to the middle in the height direction of the pre-coating roller 2, and the first nozzle 31 preferably sprays the cleaning liquid toward the side of the pre-coating roller 2 away from the coating head, that is, the first nozzle 31 is inclined downward to the left, that is, the included angle between the extension line of the first nozzle 31 and the pre-coating roller 2 is less than 90°. On the one hand, this can enable the first nozzle 31 to better wash the coating liquid on the pre-coating roller 2. On the other hand, when the first nozzle 31 sprays the cleaning liquid onto the pre-coating roller 2, the cleaning liquid can be prevented from splashing onto the coating head, thereby avoiding the contamination of the coating head by the cleaning liquid. The number of the first nozzles 31 is preferably multiple, and the multiple first nozzles 31 are uniformly distributed along the axial direction of the pre-coating roller 2 to ensure that the first nozzles 31 can uniformly spray the cleaning liquid on the pre-coating roller 2, improving the cleaning effect of the cleaning liquid. At the same time, the multiple first nozzles 31 can enhance the flushing pressure on the pre-coating roller 2, improving the flushing effect of the first nozzle 31.

[0047] A second hollow portion 121 may be provided on the first side wall 12, and the first nozzle 31 may be disposed on the second mounting plate 122. The second mounting plate 122 is detachably disposed on the first side wall 12. That is to say, the first nozzle 31 can be first installed on the second mounting plate 122, and then the second mounting plate 122 can be installed on the first side wall 12. In this way, the overall installation and disassembly of the first nozzle 31 and the second mounting plate 122 can be achieved, improving work efficiency. Of course, the second mounting plate 122 can also be first installed on the first side wall 12, and then the first nozzle 31 can be installed on the second mounting plate 122. In some embodiments, the first nozzle 31 can also be directly installed on the first side wall 12.

[0048] The second nozzle 34 is preferably disposed at a position near the middle and lower part of the second side wall 13, that is, the second nozzle 34 is disposed at a position near the middle and lower part in the height direction of the pre-coating roller 2, and the second nozzle 34 sprays the cleaning liquid toward the side of the pre-coating roller 2 away from the coating head. When the second nozzle 34 sprays the cleaning liquid onto the pre-coating roller 2, the splashing of the cleaning liquid onto the coating head can be avoided, thereby preventing the coating head from being contaminated by the cleaning liquid. The number of the second nozzles 34 is preferably multiple, and the multiple second nozzles 34 are evenly distributed along the axial direction of the pre-coating roller 2 to ensure that the second nozzles 34 can spray the cleaning liquid evenly on the pre-coating roller 2, improving the cleaning effect of the cleaning liquid. At the same time, the multiple second nozzles 34 can enhance the scouring pressure on the pre-coating roller 2, improving the scouring effect of the second nozzles 34.

[0049] Refer to Figure 4 , the first squeegee 32 is preferably disposed at the connection between the first side wall 12 and the bottom wall 11, and the first squeegee 32 is slidably connected to the pre-coating roller 2. The first squeegee 32 is inclined upward to the right, and the angle between the first squeegee 32 and the pre-coating roller 2 is less than 90°. That is, the extending direction of the first squeegee 32 is opposite to the rotating direction of the pre-coating roller 2, which is equivalent to the first squeegee 32 scraping the coating liquid and the cleaning liquid from the pre-coating roller 2. The acting force between the first squeegee 32 and the pre-coating roller 2 is greater, so that the effect of the first squeegee 32 removing the cleaning liquid and the coating liquid on the pre-coating roller 2 can be improved. The second squeegee 33 is preferably disposed at the connection between the second side wall 13 and the bottom wall 11, and the second squeegee 33 is slidably connected to the pre-coating roller 2. The second squeegee 33 is inclined upward to the left, and the angle between the second squeegee 33 and the pre-coating roller 2 is less than 90°. That is, the extending direction of the second squeegee 33 is opposite to the rotating direction of the pre-coating roller 2, which is equivalent to the second squeegee 33 scraping the coating liquid and the cleaning liquid from the pre-coating roller 2. The acting force between the second squeegee 33 and the pre-coating roller 2 is greater, so that the effect of the second squeegee 33 removing the cleaning liquid and the coating liquid on the pre-coating roller 2 can be improved. The third squeegee 35 is preferably disposed at a position near the middle and upper part of the second side wall 13, and the third squeegee 35 is slidably connected to the pre-coating roller 2.

[0050] In a specific embodiment, refer to Figure 1 、 Figure 2, the precoating device 100 may further include a first driving mechanism 4, and the first driving mechanism 4 is used to drive the third blade 35 to reciprocate axially along the precoating roller 2. The first driving mechanism 4 may be a cylinder, and the cylinder can drive the third blade 35 to reciprocate axially along the precoating roller 2. The number of the first driving mechanisms 4 may be one or two. When there is one first driving mechanism 4, the first driving mechanism 4 is arranged at one end of the third blade 35 in the axial direction of the precoating roller 2. When there are two first driving mechanisms 4, the two first driving mechanisms 4 are respectively arranged at both ends of the third blade 35 in the axial direction of the precoating roller 2.

[0051] As a preferred embodiment, referring to Figure 1 , Figure 4 , the third blade 35 may be arranged on a slide rail 133, the slide rail 133 may be arranged on a first mounting plate 132, the two first driving mechanisms 4 are respectively arranged at both ends of the slide rail 133, and the first driving mechanism 4 is used to drive the slide rail 133 to reciprocate axially along the precoating roller 2, and the slide rail 133 can drive the third blade 35 to reciprocate axially along the precoating roller 2. The slide rail 133 not only supports the third blade 35 and improves the straightness of the third blade 35, but also makes the reciprocating movement of the third blade 35 in the axial direction of the precoating roller 2 more stable.

[0052] Referring to Figure 1 , Figure 2 , the precoating device 100 may further include a second driving mechanism 5, and the second driving mechanism 5 is used to drive the precoating roller 2 to rotate circumferentially along the rotation axis of the precoating roller 2. The second driving mechanism 5 may be a motor, and the motor can drive the precoating roller 2 to rotate to realize the automatic rotation of the precoating roller 2. The number of the second driving mechanisms 5 may be one or two. When there is one second driving mechanism 5, the second driving mechanism 5 is connected to the precoating roller 2 through the first connecting shaft 23 or the second connecting shaft 24 and can drive the precoating roller 2 to rotate. When there are two second driving mechanisms 5, the two second driving mechanisms 5 are respectively connected to the first end 21 and the second end 22 of the precoating roller 2 through the first connecting shaft 23 and the second connecting shaft 24 and drive the precoating roller 2 to rotate simultaneously, and the two second driving mechanisms 5 are synchronous motors. The second driving mechanism 5 may also be connected to a controller (not shown), and the controller can control parameters such as the rotation speed and time of the second driving mechanism 5 to meet the actual production needs.

[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principle and purpose of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, and all these changes should fall within the protection scope of the claims of the present invention.

Claims

1. A pre-coating device, characterized in that: include: Mounting bracket; A pre-coating roller, the pre-coating roller is rotatably arranged on the mounting bracket, and the pre-coating roller is used to adhere the coating liquid extruded by the coating head; A cleaning assembly, the cleaning assembly comprising a first nozzle, a first scraper, a second scraper, a second nozzle and a third scraper sequentially arranged along the circumference of the pre-coating roller, the first nozzle and the second nozzle both facing the pre-coating roller and used for spraying a cleaning liquid onto the pre-coating roller, the first scraper, the second scraper and the third scraper all used for removing the cleaning liquid and / or the coating liquid on the pre-coating roller; The third scraper can reciprocate along the axial direction of the pre-coating roller to reduce the gap between the third scraper and the pre-coating roller.

2. The pre-coating device according to claim 1, characterized in that: The mounting bracket includes a bottom wall, a first side wall and a second side wall that are oppositely arranged, and a third side wall and a fourth side wall that are oppositely arranged. The bottom wall, the first side wall, the second side wall, the third side wall and the fourth side wall are arranged to form a receiving space, and at least part of the pre-coating roller is arranged in the receiving space.

3. The pre-coating device according to claim 2, characterized in that: The second side wall is provided with a first hollow portion, the second nozzle and the third scraper are provided on a first mounting plate, the first mounting plate is detachably provided on the second side wall, and when the first mounting plate is not provided on the second side wall, the second scraper can be removed and installed through the first hollow portion.

4. The pre-coating device according to claim 2, characterized in that: The first nozzle is arranged near the middle of the first side wall, there are a plurality of the first nozzles, and the plurality of the first nozzles are evenly distributed along the axial direction of the pre-coating roller; The second nozzle is arranged at a position close to the middle and lower part of the second side wall. There are a plurality of the second nozzles, and the plurality of the second nozzles are evenly distributed along the axial direction of the pre-coating roller.

5. The pre-coating device according to claim 2, characterized in that: The first scraper is arranged at the connection between the first side wall and the bottom wall, and the first scraper is slidably connected to the outer peripheral surface of the pre-coating roller; The second scraper is arranged at the connection between the second side wall and the bottom wall, and the second scraper is slidably connected to the outer peripheral surface of the pre-coating roller; The third scraper is arranged at a position close to the middle and upper part of the second side wall, and the third scraper is slidably connected to the outer peripheral surface of the pre-coating roller.

6. The pre-coating device according to claim 2, characterized in that: A top plate is disposed on the top of the first side wall and the second side wall. An opening extending along the axial direction of the pre-coating roller is disposed on the top plate, and a portion of the pre-coating roller is exposed from the opening.

7. The pre-coating device according to claim 1, characterized in that: It also includes a first driving mechanism, wherein the first driving mechanism is used to drive the third scraper to reciprocate along the axial direction of the pre-coating roller; and / or, The invention also comprises a second driving mechanism, wherein the second driving mechanism is used for driving the pre-coating roller to rotate circumferentially along the rotation axis of the pre-coating roller.

8. The pre-coating device according to claim 7, characterized in that: There are two first driving mechanisms, the third scraper is arranged on the slide rail, and the two first driving mechanisms are respectively arranged at both ends of the slide rail. The first driving mechanism is used to drive the slide rail to reciprocate along the axial direction of the pre-coating roller, and the slide rail can drive the third scraper to reciprocate along the axial direction of the pre-coating roller.

9. The pre-coating device according to claim 7, characterized in that: The two ends of the pre-coating roller are respectively provided with a first connecting shaft and a second connecting shaft, at least one of which is connected to the second driving mechanism.

10. The pre-coating device according to claim 1, characterized in that: The first scraper, the second scraper and the third scraper are all made of elastic material, and the pre-coating roller is made of stainless steel.

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