Blade coating device and blade coating equipment

Abstract

The utility model discloses a blade coating device and blade coating equipment, and belongs to the technical field of battery processing. The blade coating device comprises a support assembly, a supporting assembly, an anti-overflow assembly and a scraper assembly, the coating width of slurry can be limited through two anti-overflow structures in the anti-overflow assembly, so that the slurry can be coated in an area defined by the two anti-overflow structures, a coating film layer with good edge flatness is formed, and the coating efficiency is improved. The uniformity of the edge of the formed coating film layer can be improved, and the widths of multiple positions of the coating film layer can be kept consistent, so that the quality of a subsequently formed lithium battery can be improved. Moreover, the two anti-overflow structures can move in the extending direction of the supporting assembly, so that for foils with different widths or for the requirements of different coating widths, the distance between the two anti-overflow structures can be adjusted to adapt to various coating requirements, and the applicability of the coating device can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery processing technical field, especially relate to a scraping device and scraping equipment. BACKGROUND

[0002] With the development of technology, the requirement for energy storage equipment is higher and higher. At present, lithium battery is widely used in various electronic products, vehicle and energy storage environment due to its advantages of high energy, high use voltage, wide working temperature range and long storage life.

[0003] The production of lithium battery is usually completed by material preparation, mixing, coating, rolling, sheet making and welding, wherein the coating can include roller coating, spraying and scraping. In the research process of lithium battery, the materials and structure of lithium battery are usually optimized by experiment, and in the experiment process, the uniformly stirred slurry is uniformly scraped on the foil (such as aluminum foil or copper foil) by scraping process, and the organic solvent in the slurry is dried to form the positive and negative electrode sheets of the battery.

[0004] However, the edge flatness of the slurry film layer formed by the current scraping device on the foil is low, which leads to poor quality of the lithium battery formed subsequently. UTILITY MODEL CONTENT

[0005] The utility model embodiment provides a kind of scraping device and scraping equipment. It can solve the problem that the edge flatness of the slurry film layer formed by the current scraping device on the foil is low in prior art, which leads to poor quality of the lithium battery formed subsequently, and the technical solution is as follows:

[0006] According to one aspect of the utility model, a scraping device is provided, comprising:

[0007] A support assembly includes two oppositely arranged support structures;

[0008] A support assembly is located between the two support structures, and the two ends are respectively connected with the two support structures;

[0009] An anti-overflow assembly includes two oppositely arranged anti-overflow structures, both of which are movably connected with the support assembly and can move along the extension direction of the support assembly;

[0010] A scraper assembly is detachably connected with the end of the support assembly.

[0011] Optionally, any one of the anti-overflow structures includes an anti-overflow baffle and a locking portion.

[0012] The anti-overflow baffle and the locking part are movably connected with the support assembly and can move along the extension direction of the support assembly.

[0013] The locking part is configured to lock the anti-overflow baffle and the support assembly when the anti-overflow baffle moves to a predetermined position.

[0014] Optionally, the support assembly comprises a plurality of support columns, and two ends of any one of the support columns are fixedly connected with the two support structures, respectively.

[0015] Optionally, the locking part comprises a plurality of locking rings, the plurality of locking rings are correspondingly sleeved on the plurality of support columns, and the side of the locking ring away from the support column has an annular limiting groove;

[0016] The anti-overflow baffle has a plurality of mounting through holes, the plurality of support columns are correspondingly arranged in the plurality of mounting through holes of the anti-overflow baffle, and part of the anti-overflow baffle is clamped in the annular limiting groove of the locking ring.

[0017] Optionally, the support column comprises a connecting screw rod, and the locking ring comprises two connecting bolts;

[0018] The two connecting bolts are sleeved on the connecting screw rod, and the two connecting bolts surround the annular limiting groove;

[0019] The connecting screw rod is arranged in the mounting through hole, and the two connecting bolts are located on two sides of the anti-overflow baffle, respectively.

[0020] Optionally, any one of the anti-overflow structures further comprises a flexible pad, and the flexible pad is fixedly connected with the edge of the anti-overflow baffle.

[0021] Optionally, the scraper assembly comprises two connecting parts and a blade head part;

[0022] The two connecting parts are detachably connected with the end portions of the two support structures, respectively.

[0023] The two ends of the blade head part are fixedly connected with the two connecting parts, respectively.

[0024] Optionally, any one of the support structures comprises a rectangular plate body, the rectangular plate body has one first corner portion and three second corner portions, and the first corner portion is arranged adjacent to the blade head part.

[0025] The number of the plurality of support columns is three, and the three support columns are fixedly connected with the three second corner portions, respectively.

[0026] Optionally, the two connecting parts are magnetically connected with the end portions of the two support structures, respectively.

[0027] Alternatively, the end of each of the two support structures has a clamping groove, and the two connecting portions are clamped with the two clamping grooves respectively.

[0028] According to another aspect of the present application, a doctoring device is provided, which comprises a fixed base, a driving assembly and a doctoring device.

[0029] The doctoring device is located on the fixed base, and the doctoring device is the doctoring device described above.

[0030] The driving assembly is installed on the fixed base and used to drive the doctoring device to move relative to the fixed base.

[0031] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0032] A doctoring device comprising a support assembly, a supporting assembly, an anti-overflow assembly and a doctor blade assembly is provided, the two anti-overflow structures in the anti-overflow assembly can limit the coating width of the slurry, so that the slurry can be coated in the area surrounded by the two anti-overflow structures, forming a coating film layer with good edge flatness, which can improve the flatness of the edge of the formed coating film layer, and also can keep the width of the coating film layer at multiple positions consistent, thereby improving the quality of the subsequently formed lithium battery. Moreover, since the two anti-overflow structures can move along the extension direction of the supporting assembly, for different widths of the foil or for different coating width requirements, the distance between the two anti-overflow structures can be adjusted to adapt to various coating requirements, which can improve the applicability of the doctoring device. The current doctoring device in the related art has the problem of low edge flatness of the slurry film layer formed on the foil, which leads to poor quality of the subsequently formed lithium battery.

[0033] In addition, the two support structures of the support assembly can be located on both sides of the foil, which can avoid the contact between the support assembly and the foil, thereby avoiding the influence of the support assembly on the flatness of the foil. The end of the doctor blade assembly is detachably connected with the support assembly, which can quickly replace doctor blade assemblies of different specifications to change the coating thickness. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1It is a structural schematic view of a scraping device provided by the embodiment of the utility model,

[0036] Figure 2 It is Figure 1 It is an explosion structural schematic view of the scraping device shown in the figure,

[0037] Figure 3 It is a structural schematic view of a spill-proof assembly and a supporting assembly provided by the embodiment of the utility model,

[0038] Figure 4 It is a structural schematic view of a locking part and a supporting assembly provided by the embodiment of the utility model;

[0039] Figure 5 It is a structural schematic view of another scraping device provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will make further detailed description to the embodiment of the utility model in combination with the drawings.

[0041] Although the utility model can be easily expressed as different forms of embodiments, only some specific embodiments shown in the drawings and described in detail in the specification, and it can be understood that the specification should be regarded as the exemplary description of the principle of the utility model, and not intended to limit the utility model to that described herein.

[0042] Therefore, one feature indicated in the specification will be used to explain one feature of one embodiment of the utility model, and not imply that each embodiment of the utility model must have the explained feature. In addition, it should be noted that the specification describes many features. Although certain features can be combined together to show possible system design, these features can also be used in other combinations not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limited.

[0043] In the embodiments shown in the drawings, the indication of direction (such as up, down, left, right, front and back) is used to explain the structure and movement of various elements of the utility model, which is not absolute but relative. When these elements are in the position shown in the drawings, these descriptions are appropriate. If the position of these elements changes, the indication of direction also changes accordingly.

[0044] Please refer to Figure 1 And Figure 2 , Figure 1 It is a structural schematic view of a scraping device 10 provided by the embodiment of the utility model, Figure 2 It is Figure 1An exploded structural schematic view of the shown doctor blade device 10, the doctor blade device 10 can include a support assembly 11, a support assembly 12, an anti-overflow assembly 13 and a doctor blade assembly 14.

[0045] The support assembly 11 can include two oppositely arranged support structures 111, the support assembly 11 can be located on a fixed base of the doctor blade device, the fixed base can also be used to provide a laying area of the foil. That is, the foil to be coated and the support assembly 11 in the doctor blade device 10 can be located on the fixed base. Since the support assembly 11 includes two oppositely arranged support structures 111, the two support structures 111 can be located on both sides of the foil, so that the support assembly 11 can be avoided to contact the foil, thereby avoiding the support assembly 11 to affect the flatness of the foil. For example, since the support assembly 11 is used to carry other structures in the doctor blade device 10, the support assembly 11 needs to have a certain strength, so that the weight of the support assembly 11 is larger than that of other structures in the coating device. In the coating process, the two support structures 111 of the support assembly 11 are both away from the foil by a predetermined distance, and do not contact the foil, so that the problem of deformation of the foil caused by extrusion or scratching of the support assembly 11 during the coating process can be avoided, thereby improving the consistency of the coated film.

[0046] The support assembly 12 can be located between the two support structures 111 and connected to the two support structures 111 at both ends; the support assembly 12 can be used to connect and support the two support structures 111, and both ends of the support assembly 12 can be fixedly connected to the two support structures 111, for example, both ends of the support assembly 12 can be welded, bonded or bolted to the support structures 111.

[0047] The anti-overflow assembly 13 can include two anti-overflow structures 131 arranged oppositely, and each of the two anti-overflow structures 131 is movably connected with the support assembly 12 and can move along the extension direction of the support assembly 12. The two support structures 111 can be arranged oppositely along the first direction, and the two anti-overflow structures 131 can also be arranged oppositely along the first direction, and the extension direction of the support assembly 12 can also be parallel to the first direction. The anti-overflow assembly 13 can be in contact with the foil, and the two anti-overflow structures 131 can be in contact with two opposite edge portions of the foil, respectively. During the coating process, the slurry required for coating can be poured between the two anti-overflow structures 131, and since the side of each of the two anti-overflow structures 131 close to the foil can be attached to the foil, the two anti-overflow structures 131 can limit the coating width of the slurry, so that the slurry can be coated in the area surrounded by the two anti-overflow structures 131, forming a coating film layer with good edge flatness, avoiding the problem that the edge of the coating film layer is difficult to control due to the over-strong flowability of the coating material, and also enabling the width of the coating film layer at multiple positions to remain consistent, thereby improving the quality of the lithium battery formed subsequently.

[0048] In addition, since each of the two anti-overflow structures 131 can move along the extension direction of the support assembly 12, the distance between the two anti-overflow structures 131 can be adjusted by moving at least one of the two anti-overflow structures 131. In this way, for foils with different widths or for different coating width requirements, the distance between the two anti-overflow structures 131 can be adjusted to adapt to various coating requirements, thereby improving the applicability of the coating device.

[0049] The scraper assembly 14 is detachably connected with the end of the support assembly 11. The scraper coating device 10 can include scraper assemblies 14 of various specifications for coating coating film layers of different thicknesses, and when the coating thickness is determined, a matching scraper assembly 14 can be selected from the plurality of scraper assemblies 14 and installed on the support assembly 11. Alternatively, when the coating thickness is determined, the scraper assembly 14 can be detached from the end of the support assembly 11 for adjustment and measurement, so as to adjust the specification of the scraper assembly 14, which can reduce the adjustment difficulty and measurement accuracy of the scraper assembly 14.

[0050] For example, the coating device further comprises a driving assembly mounted on the fixed base, the driving assembly can be connected with the support assembly 11, and the process of using the doctor blade coating device 10 to coat the foil in the embodiment of the utility model can comprise the following steps: (1) coating the foil on the fixed base of the coating device, and installing the doctor blade assembly 14 corresponding to the required coating thickness at one end of the support assembly 11. (2) placing the doctor blade coating device 10 on the fixed base, at this time, the two support structures 111 in the doctor blade coating device 10 are located at the two sides of the foil, that is, the two support structures 111 do not contact the foil, and the two anti-overflow structures 131 are respectively pressed at the two edge positions of the foil. (3) adjusting the distance between the two anti-overflow structures 131 according to the width of the foil or the preset coating width, and pouring the slurry between the two anti-overflow structures 131. (4) starting the driving assembly, the driving assembly can drive the doctor blade coating device 10 to move along the extension direction of the foil, in this process, the coating width of the slurry is limited by the two anti-overflow structures 131, and the slurry can flow out of the slit of the doctor blade assembly 14 to form a coating film layer on the foil according to the preset width and the preset thickness.

[0051] In summary, the doctor blade coating device 10 comprising the support assembly 11, the supporting assembly 12, the anti-overflow assembly 13 and the doctor blade assembly 14 is provided in the embodiment of the utility model, the two anti-overflow structures 131 in the anti-overflow assembly 13 can limit the coating width of the slurry, so that the slurry can be coated in the area surrounded by the two anti-overflow structures 131 to form a coating film layer with good edge flatness, which can improve the flatness of the edge of the formed coating film layer, and can also make the width of the coating film layer at multiple positions consistent, thereby improving the quality of the subsequent formed lithium battery. Moreover, since the two anti-overflow structures 131 can move along the extension direction of the supporting assembly 12, for foils with different widths or for different coating width requirements, the distance between the two anti-overflow structures 131 can be adjusted to adapt to various coating requirements, thereby improving the applicability of the coating device. The problem that the edge flatness of the slurry film layer formed by the current doctor blade coating device 10 on the foil is low in the related art, resulting in poor quality of the subsequent formed lithium battery, can be solved.

[0052] In addition, the two support structures 111 of the support assembly 11 can be located at the two sides of the foil, which can avoid the contact between the support assembly 11 and the foil, thereby avoiding the influence of the support assembly 11 on the flatness of the foil. The end part of the doctor blade assembly 14 is detachably connected with the support assembly 11, different specifications of the doctor blade assembly 14 can be quickly replaced to change the coating thickness.

[0053] Please refer to Figure 2 and Figure 3 , Figure 3is a structure schematic view of the anti-overflow assembly 13 and the supporting assembly 12, in an alternative embodiment, any one of the anti-overflow structures 131 in the anti-overflow assembly 13 can include an anti-overflow baffle 1311 and a locking portion 1312; the anti-overflow baffle 1311 and the locking portion 1312 are both movably connected with the supporting assembly 12 and can move along the extension direction of the supporting assembly 12.

[0054] When the anti-overflow baffle 1311 moves along the extension direction of the supporting assembly 12, the locking portion 1312 can also move with the anti-overflow baffle 1311, and when the anti-overflow baffle 1311 moves to the predetermined position, the locking portion 1312 can lock the anti-overflow baffle 1311 at the current position to improve the stability of the anti-overflow assembly 13. Wherein, the predetermined position refers to the position to which the two anti-overflow baffles 1311 are adaptively moved according to the width of the foil or the coating width requirement.

[0055] In an exemplary embodiment, the two support structures 111 can both be plate-shaped structures, and the two anti-overflow baffles 1311 can also both be plate-shaped structures, the ratio of the thickness of the anti-overflow baffle 1311 to the thickness of the support structure 111 ranges from 1 / 15 to 1 / 10, for example, the thickness of the anti-overflow baffle 1311 can be 2mm-10mm, and the thickness of the support structure 111 can be 10mm-20mm. Since the thickness of the anti-overflow baffle 1311 is small, the weight of the anti-overflow baffle 1311 is less than the weight of the support structure 111, so compared with the structure in which the support structure 111 is directly pressed on the foil, in the embodiment of the present application, the support structure 111 is arranged on the outer side of the foil, and the anti-overflow structure 131 with lighter weight is in contact with the foil, which can reduce the friction between the squeegee coating device 10 and the foil, thereby avoiding the problem of deformation of the foil due to extrusion or scratching by the support assembly 11 during coating.

[0056] Please refer to Figure 2 , Figure 3 and Figure 4 , Figure 4 is a structure schematic view of the locking portion 1312 and the supporting assembly 12, in an alternative embodiment, the supporting assembly 12 can include a plurality of supporting columns 121, and the two ends of any one of the supporting columns 121 are fixedly connected with the two support structures 111. The plurality of supporting columns 121 can support the two support structures 111, which can improve the overall stability of the squeegee coating device 10.

[0057] In an alternative implementation, the locking portion 1312 can include a plurality of locking rings h1, each of which is sleeved on a support column 121, and the side of the locking ring h1 away from the support column 121 has an annular limiting groove c1; the anti-overflow baffle 1311 has a plurality of mounting holes k1, and each of the support columns 121 is sleeved in a mounting hole k1 of the anti-overflow baffle 1311, and part of the anti-overflow baffle 1311 is clamped in the annular limiting groove c1 of the locking ring h1. In this way, the anti-overflow baffle 1311 can be limited by the cooperation of the annular limiting groove c1 and the mounting hole, so that the anti-overflow baffle 1311 can be locked at a predetermined position by the locking ring h1 when the anti-overflow baffle 1311 moves to the predetermined position.

[0058] Please refer to Figure 2 , Figure 3 and Figure 4 In an alternative implementation, the support column 121 can include a connecting screw g1, and the locking ring h1 can include two connecting bolts (h11 and h12); the two connecting bolts (h11 and h12) are sleeved on the connecting screw g1, and the two connecting bolts (h11 and h12) form the annular limiting groove c1; the connecting screw g1 is sleeved in the mounting hole k1, and the two connecting bolts (h11 and h12) are located on the two sides of the anti-overflow baffle 1311, respectively.

[0059] For example, the two connecting bolts (h11 and h12) include a first bolt h1 and a second bolt h2, and during the movement of the anti-overflow baffle 1311 along the length direction of the connecting screw g1, the first bolt h1 and the second bolt h2 can rotate to move with the anti-overflow baffle 1311 along the length direction of the connecting screw g1; when the anti-overflow baffle 1311 moves to a predetermined position, the first bolt h1 and the second bolt h2 can abut against the anti-overflow baffle 1311, so that the first bolt h1 and the second bolt h2 can clamp the anti-overflow baffle 1311, thereby fixing the distance between the two anti-overflow baffles 1311.

[0060] Please refer to Figure 2 and Figure 5 , Figure 5 is another structure schematic view of the scraping device 10 provided by the embodiment of the present application, and in an alternative implementation, any one of the anti-overflow structures 131 can further include a flexible pad 1313 fixedly connected with the edge of the anti-overflow baffle 1311. The flexible pad 1313 can be fixedly connected with the edge of the anti-overflow baffle 1311 close to the side of the foil, so that by arranging the flexible pad 1313 between the anti-overflow baffle 1311 and the foil, the influence of the anti-overflow structure 131 on the foil when the anti-overflow structure 131 contacts the foil can be reduced. For example, the flexible pad 1313 can include a silica gel pad or a rubber pad.

[0061] In one exemplary embodiment, the flexible pad 1313 may be strip-shaped, with a chamfered structure at the end of the flexible pad 1313 away from the scraper assembly 14. This chamfered structure may be located on the side of the flexible pad 1313 facing the foil, thus preventing the end of the flexible pad 1313 from scratching the foil as the coating device 10 moves along the extension direction of the foil. That is, by chamfering the end of the flexible pad 1313, the sharp edges of the flexible pad 1313 can be prevented from scratching the foil.

[0062] Please refer to Figure 5 In one optional embodiment, the scraper assembly 14 may include two connecting portions 141 and a blade head 142; the two connecting portions 141 are detachably connected to the ends of two support structures 111 respectively; the two ends of the blade head 142 are fixedly connected to the two connecting portions 141 respectively. The scraper assembly 14 may be in the shape of an "I", and the blade head 142 and two anti-overflow baffles 1311 may form a receiving groove for holding slurry. One end of the receiving groove may have a strip-shaped gap, and the width of the strip-shaped gap can be adjusted by changing the distance between the blade head 142 and the foil, thereby adjusting the thickness of the coating film. The blade head 142 may be made of stainless steel, which is easy to clean and has good hardness, suitable for coating high-viscosity slurries, and avoids deformation of the scraper part.

[0063] Please refer to Figure 5 In an optional embodiment, any one of the support structures 111 may include a rectangular plate having a first corner and three second corners, the first corner being adjacent to the blade head 142; the number of the plurality of support columns 121 is three, and the three support columns 121 are respectively fixedly connected to the three second corners. In this way, the support columns 121 can be prevented from contacting the slurry located in the receiving tank, which on the one hand reduces the cleaning difficulty of the scraping device 10, and on the other hand reduces the waste of slurry.

[0064] In one alternative embodiment, the two connecting portions 141 of the scraper assembly 14 are magnetically connected to the ends of the two support structures 111, respectively. The scraper assembly 14 and the support assembly 11 can be detachably connected through the magnetic attraction between the connecting portions 141 and the support structures 111.

[0065] In an alternative embodiment, the end of each of the two support structures 111 has a clamping groove, and the two connecting portions 141 are clamped in the two clamping grooves respectively, so as to realize detachable connection of the doctor blade assembly 14 and the support assembly 11.

[0066] The doctor blade device 10 in the embodiment of the present application has simple structure, and can reduce the difficulty of replacement, maintenance and cleaning of the components in the doctor blade device 10, thereby improving the applicability of the doctor blade device 10.

[0067] The embodiment of the present application further provides a doctor blade device, which can comprise: a fixed base, a driving assembly and the doctor blade device 10; the doctor blade device 10 is located on the fixed base, and the doctor blade device 10 is the doctor blade device 10 described above; the driving assembly is installed on the fixed base and used for driving the doctor blade device 10 to move relative to the fixed base.

[0068] The driving assembly can comprise an electric push rod, and the speed and stroke of the electric push rod can be adjusted to ensure that the doctor blade device moves vertically at a constant speed during coating, thereby realizing uniform coating.

[0069] It should be noted that in the drawings, the dimensions of the regions can be exaggerated for the sake of clarity. It will be further understood that when a member is referred to as being "on" another member, it can be directly on the other member or intervening members can also be present. In addition, it will be understood that when a member is referred to as being "below" another member, it can be directly below the other member or one or more intervening members can also be present. In addition, it will be understood that when a member is referred to as being "between" two members, it can be the only member between the two members or one or more intervening members can also be present. Like reference numerals designate like elements throughout the specification.

[0070] In the present application, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise explicitly limited.

[0071] The above description is only optional embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A doctoring apparatus characterized by, include: A support assembly, the support assembly comprising two support structures disposed opposite to each other; A support assembly is located between the two support structures, and its two ends are respectively connected to the two support structures; An anti-overflow assembly includes two anti-overflow structures disposed opposite to each other. Both anti-overflow structures are movably connected to the support assembly and are capable of moving along the extension direction of the support assembly. A scraper assembly, wherein the scraper assembly is detachably connected to the end of the support assembly.

2. The doctoring apparatus of claim 1, wherein Each of the aforementioned anti-overflow structures includes an anti-overflow baffle and a locking part; Both the overflow baffle and the locking part are movably connected to the support assembly and can move along the extension direction of the support assembly; The locking part is configured to lock the anti-overflow baffle and the support component when the anti-overflow baffle moves to a predetermined position.

3. The doctoring apparatus of claim 2, wherein, The support assembly includes multiple support columns, and the two ends of any one of the support columns are fixedly connected to the two support structures respectively.

4. The doctoring apparatus of claim 3, wherein The locking part includes multiple locking rings, which are sleeved on the multiple support columns in a one-to-one correspondence, and each locking ring has an annular limiting groove on the side away from the support column. The overflow baffle has multiple mounting through holes, and the multiple support columns are inserted one-to-one through the multiple mounting through holes of the overflow baffle, and part of the overflow baffle is engaged in the annular limiting groove of the locking ring.

5. The doctoring apparatus of claim 4, wherein, The support column includes a connecting screw, and the locking ring includes two connecting bolts; Both connecting bolts are sleeved on the connecting screw, and the two connecting bolts form the annular limiting groove; The connecting screw passes through the mounting through hole, and the two connecting bolts are located on both sides of the overflow baffle.

6. The blade coating device of claim 2, wherein, Any of the spill prevention structures further includes a flexible pad, which is fixedly connected to the edge of the spill prevention baffle.

7. The blade coating device of claim 3, wherein, The scraper assembly includes two connecting parts and a blade head; The two connecting parts are detachably connected to the ends of the two support structures, respectively. The two ends of the blade head are fixedly connected to the two connecting parts respectively.

8. The doctoring apparatus of claim 7, wherein, Any support structure includes a rectangular plate having a first corner and three second corners, wherein the first corner is disposed adjacent to the cutter head; The number of the plurality of support columns is three, and the three support columns are respectively fixedly connected to the three second corner portions.

9. The blade coating device of claim 7, wherein, The two connecting parts are magnetically connected to the ends of the two support structures, respectively. Alternatively, both ends of the two support structures have snap-fit ​​grooves, and the two connecting parts snap-fit ​​into the two snap-fit ​​grooves respectively.

10. A blade coating apparatus characterized by, include: Fixed base, drive assembly and scraping device; The scraping device is located on the fixed base, and the scraping device is the scraping device according to any one of claims 1 to 9 above; The drive assembly is mounted on the fixed base and is used to drive the coating device to move relative to the fixed base.

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