Coating device

Abstract

The utility model discloses a coating device, and belongs to the technical field of coating. The coating device comprises a liquid storage tank used for storing a coating matrix, a coating roller, a support and a scraping assembly. The coating roller is rotatably arranged above the liquid storage tank, and the side, facing the liquid storage tank, of the coating roller is in contact with the coating matrix in the liquid storage tank; the bracket and the liquid storage tank are arranged at intervals; the scraping assembly is arranged on the side, close to the coating roller, of the support and comprises a lower scraping part and an upper scraping part which both face the peripheral wall of the coating roller, and the lower scraping part is movably connected with the support so as to adjust the distance and angle between the lower scraping part and the coating roller. By means of the coating device, the attractiveness and the production yield of products can be effectively improved, the distance and the angle between the lower scraping piece and the coating roller are flexible and adjustable, the service life of the lower scraping piece is prolonged, and the uniformity of a coating matrix is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the coating technology field, in particular to a coating device. BACKGROUND

[0002] At present, in the micro-concave coating process, the uniformity of the coating is usually controlled by a single scraping member scraping the excess coating matrix on the coating roller. However, under the action of the rotation of the coating roller, the excess coating matrix scraped by the scraping member will rotate synchronously with the coating roller, thereby impacting the gap between the scraping member and the coating roller, and further causing the coating matrix coated on the coating substrate to easily form stripes consistent with the movement direction of the coating substrate, thereby affecting the appearance of the product and reducing the production yield. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art, and to provide a coating device to solve the technical problem that the coating matrix coated on the substrate is easily formed into stripes consistent with the movement direction of the substrate, thereby affecting the appearance of the product and the production yield.

[0004] To solve the above technical problems, the present application provides:

[0005] A coating device, comprising:

[0006] a liquid storage tank for storing a coating matrix;

[0007] a coating roller rotatably arranged above the liquid storage tank, and a side of the coating roller facing the liquid storage tank is in contact with the coating matrix in the liquid storage tank;

[0008] a bracket spaced apart from the box body;

[0009] a scraping assembly arranged on a side of the bracket close to the coating roller, the scraping assembly comprising a lower scraping member and an upper scraping member, the lower scraping member and the upper scraping member both facing the outer peripheral wall of the coating roller, and the lower scraping member is configured to be movably connected with the bracket to adjust the distance and angle between the lower scraping member and the coating roller.

[0010] In addition, the coating device according to the present application can also have the following additional technical features:

[0011] In some embodiments of the present application, the lower scraping member is slidably connected with the bracket and rotatably connected with the bracket.

[0012] In some embodiments of the present application, the bracket is provided with a sliding rail and a connecting member slidably connected with the sliding rail, and the lower scraping member is arranged on the connecting member and rotatably connected with the connecting member.

[0013] In some embodiments of the present application, the coating device further comprises a first mounting seat, the first mounting seat is rotatably connected with the connecting piece, and the lower scraping piece is arranged on the first mounting seat.

[0014] In some embodiments of the present application, the coating device further comprises a fixing assembly, the fixing assembly comprises a first fixing piece and a second fixing piece, the first fixing piece is arranged between the sliding rail and the connecting piece, and the second fixing piece is arranged between the connecting piece and the first mounting seat.

[0015] In some embodiments of the present application, the coating device further comprises a box body, the liquid storage tank is arranged in the box body, and the box body is provided with a avoiding groove near one side of the support, the avoiding groove is used for avoiding the first mounting seat and the lower scraping piece.

[0016] In some embodiments of the present application, the support comprises a first clamping piece and a second clamping piece, a second mounting seat is arranged between the first clamping piece and the second clamping piece, the second mounting seat comprises a first mounting piece and a second mounting piece, and the upper scraping piece is arranged between the first mounting piece and the second mounting piece.

[0017] In some embodiments of the present application, the second mounting piece is located on the side of the upper scraping piece away from the lower scraping piece, the length of the second mounting piece is greater than the length of the first mounting piece and less than the length of the upper scraping piece.

[0018] In some embodiments of the present application, the lower scraping piece and the upper scraping piece are both arranged upwardly inclined.

[0019] In some embodiments of the present application, the lower scraping piece has a spacing with the outer circumferential wall of the coating roller, and the upper scraping piece is in contact with the outer circumferential wall of the coating roller.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] The present application provides a coating device, the coating device has a liquid storage tank for storing a coating matrix, a coating roller is rotatably arranged above the liquid storage tank, and the side of the coating roller facing the liquid storage tank is in contact with the coating matrix in the liquid storage tank, so that when the coating roller rotates, the coating matrix in the liquid storage tank can be lifted to coat the coating matrix on the coating substrate.

[0022] The support and the box body are spaced apart, the scraping assembly is arranged on one side of the support close to the coating roller and faces the outer circumferential wall of the coating roller, the lower scraping piece and the upper scraping piece are spaced apart in the vertical direction, and the lower scraping piece is arranged below the upper scraping piece, so that when the coating roller rotates to lift the coating matrix in the liquid storage tank, the lower scraping piece can scrape a large amount of excess coating matrix in advance, and the upper scraping piece further scrapes a small amount of remaining excess coating matrix, effectively reducing the probability of a large amount of excess coating matrix impacting the gap between the upper scraping piece and the coating roller, thereby reducing the probability of the coating matrix on the coating substrate forming stripes consistent with the movement direction of the coating substrate, and further improving the appearance and production yield of the product.

[0023] Meanwhile, the lower scraping piece is movably connected with the support, on the one hand, the distance between the lower scraping piece and the coating roller is flexibly adjustable, so that the amount of pre-scraping of the excess coating matrix is flexibly adjustable, and on the other hand, the angle between the lower scraping piece and the coating roller is flexibly adjustable, which is beneficial to prolong the service life of the lower scraping piece and improve the uniformity of the coating matrix. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0025] Figure 1 The structure of the coating device in some embodiments of the present application is shown.

[0026] Main element symbol explanation:

[0027] 100-coating device;

[0028] 110-box body; 111-liquid storage tank; 112-avoidance groove;

[0029] 120-coating roller;

[0030] 130-support; 131-first clamping piece; 132-second clamping piece; 133-slideway;

[0031] 140-scraping assembly; 141-lower scraping piece; 142-upper scraping piece;

[0032] 150-first mounting seat;

[0033] 160-second mounting seat; 161-first mounting piece; 162-second mounting piece. DETAILED DESCRIPTION

[0034]

[0034] The embodiments of the present application will be described below in detail with reference to the accompanying drawings. In all the drawings, same or similar components are denoted by same or similar reference numerals, and repeated description is omitted. Embodiments described below are exemplary in nature and are intended to be illustrative of the present application rather than to limit the same.

[0035] In the description of the present application, it is to be understood that the orientations or positional relationships denoted by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and therefore cannot be construed to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0036] In addition, the terms "first", "second", etc. are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing", and the like should be understood broadly, for example, can be fixed connection, can be detachable connection, or can be integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over", and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under", and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] As Figure 1As shown, the embodiment of the present application provides a coating device 100, which is mainly applied to a coating equipment. The coating device 100 comprises a tank 110, a coating roller 120, a support 130 and a scraping assembly 140.

[0040] The tank 110 is provided with a liquid storage groove 111 for storing a coating matrix. The coating roller 120 is rotatably arranged above the liquid storage groove 111 and is configured to contact the coating matrix in the liquid storage groove 111. The support 130 is arranged in a horizontal direction and spaced apart from the tank 110. The scraping assembly 140 is arranged on one side of the support 130 close to the coating roller 120. The scraping assembly 140 comprises a lower scraping piece 141 and an upper scraping piece 142. The lower scraping piece 141 and the upper scraping piece 142 are arranged in a vertical direction and spaced apart. Both of them are arranged towards the outer circumferential wall of the coating roller 120. The lower scraping piece 141 is arranged below the upper scraping piece 142. The lower scraping piece 141 is configured to be movably connected with the support 130 to adjust the distance and angle between the lower scraping piece 141 and the coating roller 120. After the position of the lower scraping piece 141 is adjusted, the lower scraping piece 141 is fixed on the support 130.

[0041] In the coating device 100 provided by the embodiment of the present application, the tank 110 is provided with the liquid storage groove 111 for storing the coating matrix. The coating roller 120 is rotatably arranged above the liquid storage groove 111 and is configured to contact the coating matrix in the liquid storage groove 111. Thus, when the coating roller 120 rotates, the coating matrix in the liquid storage groove 111 can be brought up to be coated on a coating substrate.

[0042] The support 130 is arranged in a horizontal direction and spaced apart from the tank 110. The scraping assembly 140 is arranged on one side of the support 130 close to the coating roller 120 and close to the outer circumferential wall of the coating roller 120. By arranging the lower scraping piece 141 and the upper scraping piece 142 in a vertical direction and spaced apart, and arranging the lower scraping piece 141 below the upper scraping piece 142, when the coating roller 120 rotates to bring up the coating matrix in the liquid storage groove 111, the lower scraping piece 141 can pre-scrape a large amount of excess coating matrix, and the upper scraping piece 142 can further scrape a small amount of remaining excess coating matrix. Thus, the probability that a large amount of excess coating matrix impacts the gap between the upper scraping piece 142 and the coating roller 120 is effectively reduced, thereby reducing the probability that the coating matrix coated on the coating substrate forms stripes consistent with the movement direction of the coating substrate, and further improving the appearance and production yield of the product.

[0043] Meanwhile, by movably connecting the lower scraping member 141 with the support 130 and rotatably connecting the lower scraping member 141 with the support 130, on the one hand, the distance between the lower scraping member 141 and the coating roller 120 is flexibly adjustable, so that the pre-removal amount of the excess coating matrix is flexibly adjustable; on the other hand, the angle between the lower scraping member 141 and the coating roller 120 is flexibly adjustable, which is beneficial to prolong the service life of the lower scraping member 141 and improve the uniformity of the coating matrix.

[0044] For example, the lower scraping member 141 and the upper scraping member 142 can both be scraping knives, and the coating device 100 further comprises a driving motor for driving the coating roller 120 to rotate. For the rotating direction of the coating roller 120, as shown in Figure 1 In the device, when the lower scraping member 141 and the upper scraping member 142 are located on the left side of the coating roller, the coating roller 120 rotates clockwise. In another embodiment, when the lower scraping member 141 and the upper scraping member 142 are located on the right side of the coating roller 120, the coating roller 120 rotates counterclockwise.

[0045] As shown in Figure 1 In one embodiment of the present application, the lower scraping member 141 is slidably connected with the support 130 and rotatably connected with the support 130.

[0046] In the present embodiment, by slidably connecting the lower scraping member 141 with the support 130, the lower scraping member 141 can slide relative to the support 130 towards the direction of approaching or moving away from the coating roller 120, so that the distance between the lower scraping member 141 and the outer circumferential wall of the coating roller 120 is flexibly adjustable, and thus the pre-removal amount of the excess coating matrix is flexibly adjustable, which is beneficial to improve the uniformity of the coating matrix coated on the coating substrate.

[0047] Meanwhile, by rotatably connecting the lower scraping member 141 with the support 130, the lower scraping member 141 can rotate relative to the support 130 in the clockwise or counterclockwise direction, so that the included angle between the lower scraping member 141 and the outer circumferential wall of the coating roller 120 is flexibly adjustable, which is beneficial to prolong the service life of the lower scraping member 141 and improve the scraping uniformity.

[0048] As shown in Figure 1 In the above embodiment of the present application, the support 130 is provided with a sliding rail 133 and a connecting piece slidably connected with the sliding rail 133, and the lower scraping member 141 is arranged on the connecting piece and rotatably connected with the connecting piece.

[0049] In this embodiment, by setting a slide rail 133 on the bracket 130 and slidingly connecting the lower scraper 141 to the connector on the slide rail 133, the lower scraper 141 can slide relative to the bracket 130 along the slide rail 133 in a direction closer to or further away from the coating roller 120. The connector on the slide rail 133 plays a guiding role and reduces friction, which helps to improve the accuracy, stability and smoothness of the sliding adjustment of the lower scraper 141.

[0050] Meanwhile, by setting the lower scraper 141 on the connector and rotatably connecting it to the connector, the lower scraper 141 can rotate relative to the slide rail 133 in a clockwise or counterclockwise direction, thereby allowing the lower scraper 141 to rotate relative to the bracket 130 in a clockwise or counterclockwise direction. This makes the included angle between the lower scraper 141 and the outer peripheral wall of the coating roller 120 flexibly adjustable, which helps to extend the service life of the lower scraper 141 and improve the uniformity of scraping.

[0051] For example, the slide rail 133 can be installed on the bracket 130 by screw connection, snap-fit, welding or integral molding.

[0052] like Figure 1 As shown in the above embodiments of this application, the coating apparatus 100 further includes a first mounting base 150, which is rotatably connected to the connecting member via a rotating shaft. The lower scraper 141 is disposed on the first mounting base 150. Since the first mounting base 150 is connected to the connecting member via a rotating shaft, and the lower scraper 141 is located on the first mounting base 150, when it is necessary to adjust the angle of the lower scraper 141, the first mounting base 150 can be rotated around the rotating shaft to adjust the position between the lower scraper 141 and the connecting member.

[0053] In this embodiment, by setting the lower scraper 141 on the first mounting base 150, the strength and stability of the lower scraper 141 are effectively improved under the support of the first mounting base 150, thereby helping to extend the service life of the lower scraper 141.

[0054] By slidably connecting the first mounting base 150 to the slide rail 133, the lower scraper 141 can slide relative to the bracket 130 along the slide rail 133 via the first mounting base 150 in a direction toward or away from the coating roller 120, effectively improving sliding stability.

[0055] Meanwhile, by rotatably connecting the first mounting base 150 to the slide rail 133, the lower scraper 141 can rotate relative to the slide rail 133 and the bracket 130 in a clockwise or counterclockwise direction via the first mounting base 150, which effectively improves the rotational stability.

[0056] For example, the first mounting base 150 is provided with a sliding part that cooperates with the slide rail 133, and the sliding part is slidably hinged to the slide rail 133. The lower scraper 141 is disposed on the first mounting base 150 by snap-fit, screw connection, welding or integral molding.

[0057] Furthermore, the coating device also includes a fixing assembly, which includes a first fixing member and a second fixing member. The first fixing member is disposed between the slide rail and the connecting member, and the second fixing member is disposed between the connecting member and the first mounting base 150. When adjusting the position of the lower scraper 141, after the connecting member moves along the slide rail to the target position, the connecting member is fixed at the target position on the slide rail by the first fixing member. The first fixing member can be a stop block or a bolt. When adjusting the angle of the lower scraper 141, after the first mounting base 150 rotates around the pivot, causing the angle of the lower scraper on the first mounting base 150 to change to a preset angle, the first mounting base 150 and the connecting member are fixed by the second fixing member. Specifically, the second fixing member can be a bolt. Mounting holes are provided on the first mounting base 150 and the connecting member. By sequentially passing the bolt through the mounting holes of the first mounting base 150 and the connecting member, the fixing between the first mounting base 150 and the connecting member is achieved. The first fixing member and the second fixing member are both prior art and will not be described in detail here.

[0058] like Figure 1 As shown in the above embodiments of this application, the coating apparatus further includes a housing 110, and a clearance groove 112 is provided on the side of the housing 110 near the support 130. The clearance groove 112 is used to avoid the first mounting seat 150 and the lower scraper 141.

[0059] In this embodiment, by opening an avoidance groove 112 on the side of the housing 110 near the bracket 130, the first mounting base 150 and the lower scraper 141 are avoided, thereby preventing structural interference between the housing 110 and the first mounting base 150 and the lower scraper 141, which would affect the angle adjustment range of the first mounting base 150 and the lower scraper 141.

[0060] like Figure 1 As shown, in one embodiment of this application, the coating apparatus 100 further includes a second mounting base 160, which includes a first mounting member 161 and a second mounting member 162. The bracket 130 includes a first clamping member 131 and a second clamping member 132. The second mounting base 160 is disposed between the first clamping member 131 and the second clamping member 132, and the upper scraping member 142 is disposed between the first mounting member 161 and the second mounting member 162.

[0061] In this embodiment, by placing the second mounting base 160 between the first clamping member 131 and the second clamping member 132, the second mounting base 160 is securely installed under the clamping and supporting action of the first clamping member 131 and the second clamping member 132. Simultaneously, by placing the upper scraper 142 between the first mounting member 161 and the second mounting member 162, the upper scraper 142 is securely installed under the clamping and supporting action of the first mounting member 161 and the second mounting member 162, effectively improving the strength of the upper scraper 142 and extending its service life.

[0062] For example, the first clamping member 131 can be fastened to the second clamping member 132 by screws, so that under the clamping pressure of the first clamping member 131 and the second clamping member 132, the first mounting member 161 and the second mounting member 162 can clamp the upper scraper member 142.

[0063] like Figure 1 As shown in the above embodiments of this application, the second mounting member 162 is located on the side of the upper scraper 142 away from the lower scraper 141. The length of the second mounting member 162 is greater than the length of the first mounting member 161 and less than the length of the upper scraper 142.

[0064] In this embodiment, the second mounting member 162 is disposed on the side of the upper scraper 142 away from the lower scraper 141. By setting the length of the second mounting member 162 to be greater than the length of the first mounting member 161, the contact area between the second mounting member 162 and the upper scraper 142 can be effectively increased, thereby enhancing the supporting effect of the second mounting member 162 on the upper scraper 142 and further improving the strength of the upper scraper 142. This reduces the probability of the upper scraper 142 bending or breaking under the contact force with the coating roller 120, effectively improving scraping stability and extending the service life of the upper scraper 142.

[0065] Meanwhile, by setting the length of the second mounting part 162 to be less than the length of the upper scraper part 142, the technical problem of the second mounting part 162 being greater than the length of the upper scraper part 142, causing the second mounting part 162 to contact the outer peripheral wall of the coating roller 120 and affecting the uniformity of scraping, can be avoided.

[0066] like Figure 1 As shown, in any of the above embodiments of this application, both the lower scraper 141 and the upper scraper 142 are inclined upwards.

[0067] In the embodiment, the lower scraping member 141 and the upper scraping member 142 are both inclined upward to conform to the rotating direction of the coating roller 120, so as to minimize the impact force of the coating roller 120 on the lower scraping member 141 and the upper scraping member 142, thereby effectively prolonging the service life of the lower scraping member 141 and the upper scraping member 142 and improving the scraping uniformity.

[0068] In any one of the above embodiments of the present application, the lower scraping member 141 has a spacing from the outer circumferential wall of the coating roller 120, and the upper scraping member 142 is in contact with the outer circumferential wall of the coating roller 120.

[0069] In the embodiment, the lower scraping member 141 has a spacing from the outer circumferential wall of the coating roller 120, and the upper scraping member 142 is in contact with the outer circumferential wall of the coating roller 120, so that when the coating roller 120 rotates to bring the coating matrix in the liquid storage tank 111, the lower scraping member 141 can pre-scrape a large amount of excess coating matrix, and the upper scraping member 142 can further scrape a small amount of excess coating matrix, effectively reducing the probability of a large amount of excess coating matrix impacting the gap between the upper scraping member 142 and the coating roller 120, thereby reducing the probability of the coating matrix applied on the coating substrate forming stripes consistent with the movement direction of the coating substrate, and thereby improving the appearance and production yield of the product.

[0070] For example, the spacing between the lower scraping member 141 and the outer circumferential wall of the coating roller 120 can be between 1-5mm.

[0071] The embodiment of the present application also provides a coating device comprising the coating device 100 in any one of the above embodiments.

[0072] The coating device has the coating device 100 in any one of the above embodiments, and thus has all the beneficial effects of the coating device 100, which will not be repeated here.

[0073] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0074] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A coating device characterized by comprising: The coating device comprises: a liquid storage tank for storing paint base; a coating roller rotatably arranged above the liquid storage tank and configured to contact the paint base in the liquid storage tank; a support arranged apart from the liquid storage tank; a scraping assembly arranged on one side of the support close to the coating roller, the scraping assembly comprising a lower scraping member and an upper scraping member, both of which are arranged towards the outer circumferential wall of the coating roller, and the lower scraping member is configured to be movably connected to the support to adjust the distance and angle between the lower scraping member and the coating roller.

2. The coating apparatus according to claim 1, characterized in that The lower scraping member is movably connected to the support and rotatably connected to the support.

3. The coating apparatus according to claim 1, wherein The support is provided with a sliding rail and a connecting member movably connected to the sliding rail, and the lower scraping member is arranged on the connecting member and rotatably connected to the connecting member.

4. The coating apparatus according to claim 3, wherein The coating device further comprises a first mounting seat rotatably connected to the connecting member, and the lower scraping member is arranged on the first mounting seat.

5. The coating apparatus according to claim 4, wherein The coating device further comprises a fixing assembly comprising a first fixing member arranged between the sliding rail and the connecting member, and a second fixing member arranged between the connecting member and the first mounting seat.

6. The coating apparatus according to claim 4, wherein The coating device further comprises a box, and the liquid storage tank is arranged in the box, and the box is provided with a avoiding groove on one side close to the support, and the avoiding groove is used for avoiding the first mounting seat and the lower scraping member.

7. The coating apparatus according to claim 1, wherein The support comprises a first clamping member and a second clamping member, and a second mounting seat is arranged between the first clamping member and the second clamping member, and the second mounting seat comprises a first mounting member and a second mounting member, and the upper scraping member is arranged between the first mounting member and the second mounting member.

8. The coating apparatus according to claim 7, wherein The second mounting member is located on the side of the upper scraping member away from the lower scraping member, and the length of the second mounting member is greater than the length of the first mounting member and less than the length of the upper scraping member.

9. The coating apparatus according to any one of claims 1 to 8, characterized in that, Both the lower scraping member and the upper scraping member are arranged upwardly inclined.

10. The coating apparatus according to any one of claims 1 to 8, characterized in that The lower scraping member has a spacing with the outer circumferential wall of the coating roller, and the upper scraping member is in contact with the outer circumferential wall of the coating roller.

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