A scraping device

Abstract

This utility model discloses a scraping device, comprising: N sets of scraper assemblies arranged sequentially along the extension direction of a slit outlet; each set of scraper assemblies includes a first scraper and a second scraper arranged opposite each other; the first scraper includes a straight cutting edge and is configured to scrape against the plane of the slit outlet; the second scraper is located downstream of the first scraper; the second scraper includes a V-shaped cutting edge and is configured to scrape against the side of the slit outlet, and the apex angle of the V-shaped cutting edge of the second scraper in the downstream scraper assembly is smaller than the apex angle of the V-shaped cutting edge of the second scraper in the upstream scraper assembly. The scraping device of this utility model provides a continuous cleaning solution for slit outlets, specifically including coarse scraping and fine scraping processes, both of which include plane scraping and side scraping to ensure the final cleaning effect.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, and in particular to a scraping device. Background Technology

[0002] In the preparation of various functional films such as photovoltaic cell light-absorbing layers, liquid crystal panel optical films, and semiconductor packaging, slit coating technology is widely used due to its good coating uniformity, high efficiency, and high utilization rate of coating solution. However, when using high-viscosity coating solutions, coating solution residues and accumulations are very likely to occur at the slit exit of the coating head. These residues mainly originate from factors such as coating start-up and shutdown, formula switching, or equipment vibration.

[0003] If the residue is not removed in time, it will lead to a series of serious coating defects: First, it will cause uneven film thickness in subsequent coatings, resulting in streaks or cloud-like patterns; second, it will cause burrs and stringing at the coating edges, seriously affecting the dimensional accuracy and appearance quality of the product; more seriously, the detached cured residue will contaminate the clean coating surface, causing the product to be scrapped.

[0004] Currently, traditional cleaning methods for this type of problem mainly rely on solvent rinsing and ultrasonic cleaning, which consume large amounts of solvent and require longer cleaning times, and may even necessitate manual mechanical scraping. This increases maintenance costs and carries the risk of damaging precision coating heads. Furthermore, these methods require interrupting the production process for maintenance, severely limiting equipment utilization and production efficiency.

[0005] Because high-viscosity coating solutions have a fast curing speed, residual liquid typically begins to harden within minutes or even tens of seconds. Once hardened, its adhesion to the coating head surface increases significantly, making cleaning exponentially more difficult.

[0006] Therefore, this utility model proposes a scraping device. Utility Model Content

[0007] The purpose of this invention is to provide a scraping device that can continuously clean the slit outlet by employing a coarse scraping and a fine scraping process, both of which include flat scraping and side scraping to ensure the final cleaning effect.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] This utility model provides a scraping device, including: N sets of scraper assemblies arranged sequentially along the extension direction of the slit outlet, each set of scraper assemblies including a first scraper and a second scraper arranged opposite to each other;

[0010] The first scraper includes a straight cutting edge and is configured to scrape against the plane of the slit exit.

[0011] The second scraper is located downstream of the first scraper; the second scraper includes a V-shaped cutting edge, configured to conform to the side of the slit outlet for scraping, and the apex angle of the V-shaped cutting edge of the second scraper in the downstream scraper assembly is smaller than the apex angle of the V-shaped cutting edge of the second scraper in the upstream scraper assembly.

[0012] The beneficial effects of the above solution are that this utility model forms a continuous cleaning process through the combination of multiple sets of scrapers, completing the entire process from coarse scraping to fine scraping without stopping the machine, greatly improving production efficiency. Simultaneously, the straight-line blade is responsible for scraping away large areas of flat residue, while the V-shaped blade is used to clean easily accumulated side corners, ensuring thorough cleaning without dead angles and solving the problem that traditional single scrapers cannot simultaneously clean both the flat surfaces and sides of the narrow slit exit. Furthermore, the smaller apex angle of the downstream V-shaped blade means that greater pressure can be applied, thereby enabling more precise scraping (fine scraping) of any trace residue that may be left by the upstream scraper. This ensures the final cleaning effect and prevents the accumulation and solidification of coating liquid due to incomplete scraping, thus avoiding a vicious cycle that makes scraping even more difficult.

[0013] Furthermore, the apex angle of the V-shaped cutting edge is 30° to 50°.

[0014] The beneficial effect of the above solution is that, by clearly defining the angle parameter of the apex angle, this utility model ensures the consistency and reliability of the device's performance. An apex angle less than 30° will result in an overly sharp cutting edge that is easily damaged; an angle greater than 50° will result in an overly blunt cutting edge and poor scraping effect.

[0015] Furthermore, the blade thickness of both the first and second scrapers is d = k·μ;

[0016] In the formula, d is the blade thickness, μ is the viscosity coefficient of the coating liquid, and k is the compatibility coefficient.

[0017] The beneficial effect of the above solution is that, by adjusting the blade thickness of the first and second scrapers, the scrapers can adapt to coating liquids of different viscosities. High-viscosity solutions require thicker, more rigid blades to provide sufficient scraping force without bending, maintaining a good cleaning effect; low-viscosity solutions can use thinner blades, which are more flexible, have better adhesion, and provide a better cleaning effect.

[0018] Furthermore, from upstream to downstream, the spacing between adjacent scraper assemblies increases sequentially;

[0019] In each scraper assembly, the first scraper and the second scraper are arranged in parallel, and the highest point of the straight cutting edge of the first scraper is higher than the lowest point of the V-shaped cutting edge of the second scraper.

[0020] The beneficial effects of the above solution are that, by gradually increasing the spacing, this invention provides sufficient time to judge the current cleanliness of the coating head during the cleaning process, avoiding over-cleaning and saving cleaning time. This invention limits the height of the entire scraping device by the highest point of the straight blade of the first scraper, thereby avoiding the apex of the V-shaped blade from contacting the plane of the slit outlet. This prevents the coating liquid scraped off by the V-shaped blade from accumulating at the apex of the V-shaped blade, thus avoiding secondary contamination of the slit outlet and improving cleaning efficiency and effectiveness.

[0021] Furthermore, the straight cutting edge includes:

[0022] A first cutting edge, the first cutting edge being configured to conform to the plane of the slit exit;

[0023] The second cutting edge is connected to the first cutting edge and the angle between the second cutting edge and the first cutting edge is an obtuse angle. The first guiding surface is used to guide the coating liquid scraped off by the first cutting edge.

[0024] The beneficial effect of the above solution is that, through the first cutting edge and the second cutting edge at an obtuse angle thereto, the first scraper is no longer a simple scraper, but a component that integrates scraping and guiding. The second cutting edge forms a bevel, which can effectively guide the scraped coating liquid into the collection device (such as a waste liquid collection tank), instead of letting it splash or flow randomly, creating conditions for subsequent centralized collection, while maintaining the cleanliness of the working area.

[0025] Furthermore, the lowest point of the V-shaped cutting edge of the second scraper is provided with a second guiding surface, which is parallel to the first guiding surface and is used to guide the coating liquid scraped off by the V-shaped cutting edge.

[0026] The beneficial effects of the above solution are that, by setting a second guide surface parallel to the first guide surface at the lowest point (i.e., the apex) of the V-shaped blade of the second scraper, the sharp corner is transformed into a flat angle, reducing the cleaning difficulty of the second scraper. Simultaneously, the second guide surface also transforms the second scraper from a simple scraper into an integrated scraping and guiding component. Furthermore, since the second guide surface and the first guide surface are parallel, they can guide all the waste liquid scraped off by the scraper to flow in the same direction, establishing a unified and efficient waste liquid outflow channel. This greatly facilitates the centralized collection of waste liquid, maintains the cleanliness of the work area, and prevents waste liquid dripping and contaminating products or equipment.

[0027] Furthermore, both the first and second scrapers are made of PFA or UHMW polymer materials.

[0028] The beneficial effects of the above solution are that the PFA and UHMW polymer materials of this invention are durable and can work for a long time in solvent environments without aging or failure, resulting in a long service life. Furthermore, these two materials have a certain degree of flexibility, allowing them to better conform to the surface of the coating head and improve cleaning performance. Their hardness is much lower than that of metal coating heads, effectively protecting the expensive coating head from scratches or wear even under pressure or minor impacts, ensuring high safety.

[0029] Furthermore, the scraping device also includes:

[0030] A base for detachably mounting the scraper assembly;

[0031] In each scraper assembly, the first scraper and the second scraper are arranged inclined to the extension direction of the slit outlet, and the cutting edges of the first scraper and the second scraper are both chamfered, the angle of the chamfer being 30° to 50°.

[0032] The beneficial effect of the above solution is that the present invention makes the replacement, cleaning and maintenance of the scraper assembly easier through the disassembly design, thereby reducing the maintenance cost and time for long-term use.

[0033] This invention features a first and second scraper arranged at an angle, transforming the scraping process from a vertical pushing motion to an oblique cutting motion. The blades gradually cut into and glide over the residue at an angle, requiring less effort, much like cutting something with an oblique knife. This significantly reduces the driving force required for scraping, resulting in smoother operation and lower energy consumption for the entire device.

[0034] Furthermore, the inclined blade of this invention naturally forms a guide slope. Under the action of gravity and the movement of the scraper, the scraped liquid is guided along the inclined blade and thrown to a predetermined side (e.g., the side facing the collection tank), realizing the integrated scraping, guiding, and discharge of waste liquid, which greatly improves the efficiency of waste liquid management.

[0035] The cutting edge of this invention is chamfered at 30° to 50°, achieving an optimal balance between maintaining sharpness (facilitating scraping) and ensuring strength (resistant to chipping and durable). Furthermore, the smooth, appropriately angled chamfer creates a smoothly transitioning wedge-shaped surface, allowing the scraper to gently conform to the coating head surface, minimizing the risk of wear or scratches on the expensive coating head.

[0036] Furthermore, the scraping device also includes:

[0037] Waste liquid collection tank, which is located below the base, is used to collect the coating liquid scraped off the coating head by the doctor blade assembly.

[0038] The beneficial effect of the above solution is that the present invention actively collects all scraped waste liquid through a waste liquid collection tank, avoiding pollution of the production line, products or environment by toxic, harmful or easily solidified waste liquid, which meets the clean and environmental protection requirements of modern production.

[0039] Furthermore, the scraping device also includes:

[0040] A drive assembly connected to the base drives the base to move along the extension direction of the slit outlet, thereby causing the scraper assembly to scrape off the coating liquid at the slit outlet.

[0041] The beneficial effect of the above solution is that the mechanical drive of the drive component ensures uniformity of wiping speed, pressure and path, avoiding the instability of manual operation, thereby ensuring that the cleaning effect is repeatable and of high quality every time.

[0042] Compared with the prior art, the beneficial effects of this utility model include at least the following:

[0043] This invention utilizes a combination of multiple scrapers to create a continuous cleaning process, completing the entire process from coarse to fine scraping without machine downtime, significantly improving production efficiency. Simultaneously, the straight blades remove large areas of surface residue, while the V-shaped blades clean easily accumulated residue from side corners, ensuring thorough cleaning without blind spots. This solves the problem of traditional single scrapers being unable to simultaneously clean both the surface and sides of narrow slits. Furthermore, the smaller apex angle of the downstream V-shaped blade means greater pressure can be applied, allowing for more precise scraping of any trace residue left by the upstream scraper. This ensures a final cleaning effect and prevents the accumulation and hardening of the coating liquid due to incomplete scraping, thus avoiding a vicious cycle that makes scraping even more difficult. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the scraping device according to an embodiment of the present invention.

[0045] Figure 2 This is another structural schematic diagram of the scraping device according to an embodiment of the present utility model.

[0046] Figure 3 This is a schematic diagram of the scraper assembly according to an embodiment of the present utility model.

[0047] Figure 4 This is another structural schematic diagram of the scraper assembly according to an embodiment of the present utility model.

[0048] Figure 5 This is a utility model Figure 3 A magnified view of a portion of the image.

[0049] In the diagram: 1. Scraper assembly; 11. First assembly; 12. Second assembly; 2. First scraper; 21. Straight cutting edge; 211. First cutting edge; 212. Second cutting edge; 3. Second scraper; 31. V-shaped cutting edge; 311. Apex angle; 312. Second guide surface; 4. Base; 41. First fastener; 5. Mounting plate; 51. Mounting hole; 52. Second fastener; 6. Slit. Detailed Implementation

[0050] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0051] It should be noted that the embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, the present invention covers any substitutions, modifications, equivalent methods and solutions made within the spirit, principles and scope of the present invention as defined by the claims. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of this utility model, the terms "first," "second," "third," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected" or "linked," and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0053] In the description of this utility model, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, when using positional terms such as "both sides," "outer side," and "upper and lower," it should be understood that they are used only for ease of understanding and description, taking into account that the structure may be oriented to other positions.

[0054] In the description of this utility model, unless otherwise expressly specified and limited, the technical or scientific terms used shall have the ordinary meaning understood by a person skilled in the art to which this utility model pertains. Terms such as “installation,” “connection,” and “joining” shall be interpreted broadly, for example, as fixed connection, detachable connection, abutting connection, or integral connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0055] This utility model embodiment is intended to introduce and explain the structural composition of an AAAA and the matching relationship between the various components. Unless otherwise specified, the dimensions, materials, and manufacturing processes of the various components in the AAAA in this utility model embodiment can be selected according to specific circumstances, and no special limitations or explanations are made here.

[0056] Furthermore, to provide the public with a better understanding of this utility model, certain specific details are described in detail in the following description. However, those skilled in the art can fully understand this utility model even without these detailed descriptions.

[0057] This utility model provides a scraping device for cleaning residual coating liquid in the slit 6 at the outlet of the coating head. It is a device for continuous cleaning of the outlet of the slit 6, and adopts a coarse scraping and fine scraping process. Both coarse scraping and fine scraping include flat scraping and side scraping to ensure the final cleaning effect.

[0058] refer to Figure 1 The scraping device of this utility model includes N sets of scraper assemblies 1 arranged sequentially along the extension direction of the slit 6 outlet. The scraper assembly 1 is configured to scrape the coating liquid on the slit 6, forming a continuous cleaning process.

[0059] During application, as the continuous cleaning of the scraper assembly 1 progresses, the slit 6 of the coating head becomes increasingly clean. Cleaning can be stopped when the cleanliness reaches a preset target. In the N sets of scraper assemblies 1, the spacing between adjacent scraper assemblies 1 increases sequentially from upstream to downstream. This sequential increase in spacing provides sufficient time to determine the current cleanliness of the coating head during the cleaning process, avoiding over-cleaning and saving cleaning time. Here, N is a positive integer.

[0060] Preferably, N equals 2. (Reference) Figure 2 The scraping device includes a first component 11 and a second component 12 arranged sequentially along the extension direction of the slit 6 outlet, and the first component 11 is located upstream of the second component 12, that is, the first component 11 scrapes the coating liquid on the slit 6 first, and the second component 12 scrapes the coating liquid on the slit 6 later.

[0061] In practical applications, refer to Figure 3 The scraping device of this utility model also includes a base 4, which is used for detachable installation of the scraper assembly 1, making the replacement, cleaning, and maintenance of the scraper assembly 1 easier and reducing long-term maintenance costs and time. Further, see reference... Figure 4 The base 4 is provided with a mounting plate 5, which is detachably mounted on the base 4 by a first fastener 41 (e.g., a bolt structure). Furthermore, the mounting plate 5 is provided with a mounting hole 51, into which the scraper assembly 1 is inserted, and the scraper assembly 1 is mounted on the mounting plate 5 and the base 4 by a second fastener 52 (e.g., a pin structure).

[0062] In actual implementation, the scraping device of this utility model also includes a waste liquid collection tank (not shown) and a drive assembly (not shown).

[0063] The waste liquid collection tank is located below the base 4 to collect the coating liquid scraped off the coating head by the scraper assembly 1, thus avoiding the pollution of the production line, products or environment by toxic, harmful or easily solidified waste liquid, which meets the clean and environmental protection requirements of modern production.

[0064] The drive assembly drives the connecting base 4 and the waste liquid collection tank. The drive base 4 moves along the extension direction of the slit 6 outlet to drive the scraper assembly 1 to scrape off the coating liquid at the slit 6 outlet. This ensures uniform scraping speed, pressure, and path, avoiding the instability of manual operation and thus ensuring repeatable high-quality cleaning results each time. Furthermore, the drive waste liquid collection tank moves along the extension direction of the slit 6 outlet, which is perpendicular to the coating direction of the coating head.

[0065] Each scraper assembly 1 of this utility model includes a first scraper 2 and a second scraper 3 arranged in parallel with each other.

[0066] In application, the first scraper 2 includes a straight cutting edge 21, which is configured to scrape against the plane of the slit 6 outlet; the second scraper 3 includes a V-shaped cutting edge 31, which is configured to scrape against the side of the slit 6 outlet, and the second scraper 3 is located downstream of the first scraper 2.

[0067] Specifically, the first scraper 2 of the first component 11, with its straight blade 21, scrapes the coating liquid on the surface of the slit 6 outlet for rough scraping. At this time, some of the coating liquid will be squeezed onto the side of the slit 6. Then, the second scraper 3 of the first component 11, with its V-shaped blade 31, scrapes the coating liquid on the side of the slit 6 for preliminary fine scraping. Next, the first scraper 2 of the second component 12, with its straight blade 21, scrapes the coating liquid on the surface of the slit 6 outlet, and the second scraper 3 of the second component 12, with its V-shaped blade 31, scrapes the coating liquid on the side of the slit 6 for secondary fine scraping to ensure a cleaning effect.

[0068] Furthermore, if the apex angle 311 of the V-shaped cutting edge 31 is less than 30°, the cutting edge will be too sharp and easily damaged; if the apex angle 311 of the V-shaped cutting edge 31 is greater than 50°, the cutting edge will be too blunt and the scraping effect will be poor. Therefore, the apex angle 311 of the V-shaped cutting edge 31 of this utility model is 30° to 50°.

[0069] Preferably, the apex angle 311 of the V-shaped cutting edge 31 of the second scraper 3 in the downstream scraper assembly 1 is smaller than the apex angle 311 of the V-shaped cutting edge 31 of the second scraper 3 in the upstream scraper assembly 1. A smaller apex angle 311 of the downstream V-shaped cutting edge 31 means that greater pressure can be applied, thereby enabling more precise scraping (fine scraping) of any trace residue that may be left by the upstream scraper assembly 1. This ensures the final cleaning effect and prevents the accumulation and solidification of the coating liquid due to incomplete scraping, which would lead to a vicious cycle where scraping becomes even more difficult.

[0070] In practical applications, in each scraper assembly 1, the first scraper 2 and the second scraper 3 are arranged at an angle to the extension direction of the slit 6 outlet. The angled arrangement of the first scraper 2 and the second scraper 3 changes the scraping process from a vertical pushing motion to an oblique cutting motion. The cutting edge gradually cuts into and slides over the residue at an angle, requiring less effort, similar to cutting something with an oblique knife. This significantly reduces the driving force required for scraping, making the entire scraping device operate more smoothly and consume less energy. Preferably, the angle between the scraper (e.g., the first scraper 2 and the second scraper 3) and the forward direction of the scraper assembly 1 (the forward direction of the scraper assembly 1 is parallel to the extension direction of the slit 6 outlet) is 30° to 75°.

[0071] Furthermore, the scraped waste liquid needs to be immediately guided away from the cleaning area; otherwise, it will be dragged back by subsequent scrapers or by the scraper itself, contaminating the cleaned surface or crevices. The inclined scraper of this invention forms a guiding slope. Under the influence of gravity and the movement of the scraper, the scraped coating liquid is guided along the inclined blade and thrown to a predetermined side (e.g., towards the waste liquid collection tank), achieving integrated scraping, guiding, and discharge of the coating liquid, greatly improving the efficiency and effectiveness of the entire cleaning process.

[0072] Furthermore, in each blade assembly 1, the cutting edges of the first blade 2 and the second blade 3 are both chamfered, with an angle of 30° to 50°. This 30° to 50° chamfering ensures sufficient sharpness to efficiently cut and scrape away fast-curing, high-viscosity solutions, while also providing sufficient support strength and wear resistance. This guarantees a long service life for the blades in harsh working environments, reducing replacement frequency and maintenance costs. In addition, the smooth, appropriately angled chamfer creates a smoothly transitioning wedge-shaped surface, allowing the blade to gently conform to the coating head surface, minimizing the risk of wear or scratches on the expensive coating head.

[0073] Furthermore, in each set of scraper assemblies 1, the highest point of the straight cutting edge 21 of the first scraper 2 is higher than the lowest point of the V-shaped cutting edge 31 of the second scraper 3. This avoids the apex 311 of the V-shaped cutting edge 31 from contacting the plane of the slit 6 outlet. This not only prevents the lowest point of the V-shaped cutting edge 31 and its surrounding area from being too sharp and narrow, thus avoiding damage to the plane of the slit 6 outlet, but also prevents the coating liquid scraped off by the V-shaped cutting edge 31 from accumulating at the apex 311 of the V-shaped cutting edge 31, which would cause secondary contamination of the slit 6 outlet, thereby improving cleaning efficiency and effectiveness.

[0074] In practical application, high-viscosity solutions require thicker, more rigid blades to provide sufficient scraping force without bending, thus maintaining a good cleaning effect. Low-viscosity solutions, on the other hand, can use thinner blades, which offer better flexibility, better adhesion, and a better cleaning effect. This invention adjusts the blade thickness of the first scraper 2 and the second scraper 3 to allow the scrapers to adapt to coating liquids of different viscosities. Specifically, the blade thickness of both the first scraper 2 and the second scraper 3 is d = k·μ. Where d is the blade thickness, μ is the viscosity coefficient of the coating liquid (the higher the viscosity, the larger the coefficient), and k is the adaptation coefficient. Generally, k is taken as (0,1), and preferably, k is taken as 0.1 mm·s / Pa to 0.3 mm·s / Pa.

[0075] Furthermore, both the first scraper 2 and the second scraper 3 are made of PFA or UHMW polymer materials. PFA and UHMW polymer materials are durable and can operate for extended periods in solvent environments without aging or failure, resulting in a long lifespan. Simultaneously, PFA and UHMW polymer materials possess a degree of flexibility, allowing them to better conform to the coating head surface and improve cleaning performance. In addition, the hardness of PFA and UHMW polymer materials is significantly lower than that of metal coating heads, effectively protecting the expensive coating head from scratches or wear even under pressure or minor impacts.

[0076] refer to Figure 5 The straight cutting edge 21 of this utility model includes a first cutting edge 211 and a second cutting edge 212. The second cutting edge 212 is connected to the first cutting edge 211, and the included angle between the second cutting edge 211 and the first cutting edge 211 is an obtuse angle.

[0077] In this application, the first cutting edge 211 is configured to conform to the plane of the slit 6 outlet; the second cutting edge 212 serves as a first guide surface for guiding the coating liquid scraped off by the first cutting edge 211.

[0078] In practical applications, the first cutting edge 211 and the second cutting edge 212 transform the first scraper 2 from a simple scraper into a component that integrates scraping and guiding. The second cutting edge 212 forms a bevel, which effectively guides the scraped coating liquid into the waste liquid collection tank, instead of allowing the waste liquid to splash or flow disorderly, thus maintaining the cleanliness of the working area.

[0079] The second scraper 3 of this utility model has a second guide surface 312 at the lowest point of the V-shaped cutting edge 31, which can convert the sharp corner of the lowest point of the V-shaped cutting edge 31 into a flat corner, reducing the cleaning difficulty of the second scraper 3.

[0080] In application, the second guide surface 312 is used to guide the coating liquid scraped by the V-shaped blade 31, so that the second scraper 3 is no longer a simple scraper, but a component that integrates scraping and guiding.

[0081] In practical applications, the second guide surface 312 is parallel to the first guide surface. The second guide surface 312 and the first guide surface can guide all the waste liquid scraped off by the scraper to flow in the same direction, establish a unified and efficient waste liquid outflow channel, greatly facilitate the centralized collection of waste liquid, keep the working area clean, and avoid waste liquid dripping and contaminating products or equipment.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A wiping device, characterized in that include: N sets of scraper assemblies (1) are arranged sequentially along the extension direction of the slit (6) outlet. Each set of scraper assemblies (1) includes a first scraper (2) and a second scraper (3) arranged opposite to each other. The first scraper (2) includes a straight cutting edge (21) and is configured to scrape against the plane of the slit (6) exit. The second scraper (3) is located downstream of the first scraper (2); the second scraper (3) includes a V-shaped cutting edge (31) configured to scrape against the side of the slit (6) outlet, and the apex angle (311) of the V-shaped cutting edge (31) of the second scraper (3) in the downstream scraper assembly (1) is smaller than the apex angle (311) of the V-shaped cutting edge (31) of the second scraper (3) in the upstream scraper assembly (1).

2. The wiper device of claim 1, wherein The apex angle (311) of the V-shaped cutting edge (31) is 30° to 50°.

3. The wiper device of claim 1, wherein The blade thickness of both the first scraper (2) and the second scraper (3) is d = k·μ; In the formula, d is the blade thickness, μ is the viscosity coefficient of the coating liquid, and k is the compatibility coefficient.

4. The wiper device of claim 1, wherein In the N groups of scraper assemblies (1), the spacing between adjacent scraper assemblies (1) increases sequentially from upstream to downstream; In each scraper assembly (1), the first scraper (2) and the second scraper (3) are arranged in parallel, and the highest point of the straight cutting edge (21) of the first scraper (2) is higher than the lowest point of the V-shaped cutting edge (31) of the second scraper (3).

5. The wiper device of claim 1, wherein The straight cutting edge (21) includes: A first cutting edge (211) is configured to conform to the plane of the slit (6) exit. The second cutting edge (212) is connected to the first cutting edge (211) and the angle between the second cutting edge (212) and the first cutting edge (211) is an obtuse angle. The first guiding surface is used to guide the coating liquid scraped off by the first cutting edge (211).

6. The wiper device of claim 1, wherein The lowest point of the V-shaped cutting edge (31) of the second scraper (3) is provided with a second guide surface (312), which is parallel to the first guide surface and is used to guide the coating liquid scraped off by the V-shaped cutting edge (31).

7. The wiper device of claim 1, wherein The first scraper (2) and the second scraper (3) are both made of PFA or UHMW polymer materials.

8. The wiper device of claim 1, wherein The scraping device also includes: A base (4) for detachably mounting the scraper assembly (1); In each scraper assembly (1), the first scraper (2) and the second scraper (3) are arranged in a manner inclined to the extension direction of the slit (6) outlet, and the cutting edges of the first scraper (2) and the second scraper (3) are both chamfered, the angle of the chamfer being 30° to 50°.

9. The wiper device of claim 1, wherein The scraping device also includes: Waste liquid collection tank, which is located below the base (4), is used to collect the coating liquid scraped off the coating head by the scraper assembly (1).

10. The wiper device of claim 8, wherein The scraping device also includes: A drive assembly is connected to the base (4) and drives the base (4) to move along the extension direction of the slit (6) outlet to drive the scraper assembly (1) to scrape off the coating liquid at the slit (6) outlet.

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