Coating die head and coating device

Abstract

The utility model provides a coating die head and a coating device. The coating device comprises a support and a coating die head installed on the support. The coating die head comprises a back plate, a die head assembly mounted on the back plate, and a contact roller rotatably mounted on the back plate. The die head assembly is provided with a coating lip, and the contact roller and the coating lip are located on the same side of the coating die head. The contact roller is used for making rolling contact with the base material and generating tension on the base material so as to flatten the base material, the die head assembly is used for coating the flattened base material through the coating lip, and the die head assembly and the base material are mutually spaced in the coating process. The die head assembly and the base material are arranged at intervals, and the base material is flattened through the contact roller in rolling contact with the base material, so that hard friction between the coating die head and the base material is avoided, the base material is not damaged, and the conductivity of an electrode plate made of the base material is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coating, in particular to a coating die head and a coating device. Background Art

[0002] In the process of making electrodes for lithium-ion batteries, coating is the most important step. The density consistency of the coating surface directly determines the battery life and performance, and the precise control of the gap between the foil and the die lip by the coating device is the key factor in determining the density consistency of the coating surface.

[0003] The prior art discloses a staggered lip contact die head, in which the lower lip and the upper lip of the die head have a height difference, and the foil is made to be close to the lower lip by using the coating tension to flatten the foil, and the height difference between the upper lip and the lower lip is used as the coating gap for coating. However, there is hard friction between the lower lip of the staggered lip contact die head and the foil close to the lower lip, which is easy to damage the conductive primer on the surface of the foil, and reduce the conductivity of the electrode sheet made of the foil. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a coating die head and a coating device, wherein the coating die head can avoid hard friction with the substrate when coating the substrate, thereby not damaging the substrate, and is conducive to improving the conductivity of the electrode sheet made of the substrate.

[0005] In order to achieve the above object, on the one hand, the utility model provides a coating die head for coating a substrate, the coating die head comprising:

[0006] Back panel;

[0007] a die assembly mounted on the back plate, the die assembly having a coating lip; and

[0008] A contact roller rotatably mounted on the back plate, wherein the contact roller and the coating lip are located on the same side of the coating die head;

[0009] The contact roller is used to roll in contact with the substrate and generate tension on the substrate to flatten the substrate, the die assembly is used to coat the flattened substrate through the coating lip, and the die assembly is spaced apart from the substrate during the coating process.

[0010] In one embodiment, the contact roller comprises at least two contact segments and at least one mounting segment, the contact segments and the mounting segments are coaxial and alternately distributed along the extension direction of the contact roller, one mounting segment is provided between each two adjacent contact segments, the contact segment is used to roll in contact with the substrate to flatten the substrate, and the diameter of the mounting segment is smaller than the diameter of the contact segment;

[0011] Wherein, the coating die head further comprises at least one set of rotatable components, each of the rotatable components is correspondingly sleeved on one of the mounting sections, and the mounting section is rotatably mounted on the back plate through the rotatable components.

[0012] In one embodiment, the size of the installation segment located between two adjacent contact segments along the extension direction of the contact roller is less than or equal to a first preset size;

[0013] And / or, there is a gap between the outer wall surface of the rotatable component close to the substrate and the rolling contact of the contact section with the outer peripheral surface of the substrate, and the value of the gap is less than or equal to a second preset size.

[0014] In one embodiment, the rotatable assembly includes a bearing disposed on the outer peripheral wall of the mounting section, and a bearing cover for fixedly connecting the bearing to the back plate;

[0015] And / or, the back plate is provided with a mounting groove at a position corresponding to the contact section, and at least a part of the contact section is accommodated in the corresponding mounting groove.

[0016] In one embodiment, the contact roller is made of a wear-resistant material, or the contact roller is covered with a wear-resistant layer at least on the outer peripheral surface of the portion for rolling contact with the substrate;

[0017] And / or, the coating die head further comprises a first driving member, and the first driving member is used to drive the rotation of the contact roller.

[0018] In one embodiment, the contact position between the contact roller and the substrate is defined as a first reference point, the coating position between the die assembly and the substrate is defined as a second reference point, and the distance between the first reference point and the second reference point is less than or equal to a third preset size.

[0019] In one embodiment, the die assembly includes a first die and a second die, the first die is installed on one side of the back plate in the thickness direction, the second die is installed on the side of the first die away from the back plate, and the coating lip is formed between the side of the first die close to the contact roller and the side of the second die close to the contact roller;

[0020] The first die head and / or the second die head is provided with a slurry tank, and the first die head and / or the second die head is provided with a feed port, and the feed port and the coating lip are respectively connected to the slurry tank.

[0021] In one embodiment, the die assembly further comprises at least one hinge, and a side of the first die away from the contact roller is rotationally connected to a side of the second die away from the contact roller via the at least one hinge.

[0022] In one embodiment, the die assembly further includes a gasket sandwiched between the first die and the second die, the gasket having an opening connected to the slurry tank on a side close to the contact roller, the side of the first die close to the contact roller, the side of the second die close to the contact roller, and the gasket surround the opening to form the coating lip, and the gasket is used to seal the periphery of the slurry tank except for the portion corresponding to the coating lip.

[0023] In one embodiment, a plane where a side of the first die head close to the contact roller is located is coplanar with a plane where a side of the second die head close to the contact roller is located.

[0024] In one embodiment, the die assembly is movably mounted on the back plate, and the coating die further comprises a driving mechanism, and the driving mechanism is used to drive the die assembly to move on the back plate.

[0025] In one embodiment, a first groove is formed on one side of the back plate for mounting the die assembly, and the coating die assembly further comprises a linear guide rail and a slider disposed in the first groove, wherein the extension direction of the linear guide rail is perpendicular to the extension direction of the contact roller, and the slider is movably mounted on the linear guide rail, and the surface of the slider facing away from the first groove is flush with or exceeds the surface of the back plate facing the die assembly;

[0026] Wherein, the die head assembly is installed on the slider, and the driving mechanism is used to drive the die head assembly to move along the extension direction of the linear guide rail.

[0027] In one embodiment, the back plate is provided with at least one mounting platform, the driving mechanism includes at least one set of driving components, the driving components correspond to the mounting platforms one by one, and the driving components include a screw rod, a first wedge block, a second wedge block and a second driving member;

[0028] Among them, the screw rod is rotatably mounted on the corresponding mounting platform, the first wedge block is threadedly connected to the screw rod and is slidably arranged on the mounting platform, a slope is provided on the side of the first wedge block facing away from the substrate, and the extension direction of the slope forms a preset angle with the axial direction of the screw rod, the second wedge block is installed at a position of the die head assembly corresponding to the mounting platform and can slide relative to the slope of the first wedge block, the second driving member is installed on the corresponding mounting platform and is used to drive the screw rod to rotate, and the rotation of the screw rod drives the first wedge block to move along the axial direction of the screw rod, thereby causing the first wedge block to drive the second wedge block and the die head assembly connected to the second wedge block to move along the extension direction of the linear guide rail.

[0029] In one embodiment, the driving assembly also includes a rotating shaft, which is rotatably mounted on the second wedge block and is in rolling contact with the inclined surface of the first wedge block. The rotation of the screw drives the first wedge block to move along the axial direction of the screw block. The movement of the first wedge block drives the rotating shaft to rotate, and the movement of the first wedge block simultaneously drives the rotating shaft, the second wedge block connected to the rotating shaft, and the die head assembly connected to the second wedge block to move along the extension direction of the linear guide rail.

[0030] In one embodiment, the back plate is provided with a second groove, the second groove has an opening penetrating through the back plate and on one side for mounting the contact roller, the coating die head further comprises a displacement sensor disposed in the second groove, the displacement sensor is used to detect the distance between the substrate and the coating lip during the coating process, and the displacement sensor is used to connect to a controller and feed back the detected distance between the substrate and the coating lip to the controller;

[0031] Wherein, the controller is electrically connected to the second driving member, and the controller is used to control the second driving member to drive the rotation of the screw according to the distance between the substrate and the coating lip fed back by the displacement sensor, thereby adjusting the movement of the die head assembly along the extension direction of the linear guide rail.

[0032] In one embodiment, the back plate is provided with a plurality of second grooves at intervals along the extension direction of the contact roller, and a displacement sensor is correspondingly arranged in each of the second grooves. The plurality of displacement sensors are used to detect the distance between the substrate and the coating lip.

[0033] In one embodiment, the distance that the first wedge moves along the axial direction of the screw is S, the preset angle between the inclined surface and the axial direction of the screw is α, and the distance that the die head assembly moves in a direction perpendicular to the axial direction of the screw is H, wherein S, α, and H satisfy the relationship: H=S*tanα.

[0034] On the other hand, the utility model further provides a coating device, comprising a bracket and the coating die head as described above, wherein the coating die head is installed on the bracket.

[0035] Compared with the prior art, the utility model has the following beneficial effects: in the coating die head and coating device provided by the utility model, by setting the die head assembly and the substrate at a distance, and by flattening the substrate through the contact roller in rolling contact with the substrate, it is possible to avoid hard friction between the coating die head and the substrate when coating the substrate, thereby not damaging the substrate, which is beneficial to improving the conductivity of the electrode sheet made of the substrate. In addition, by flattening the substrate by generating tension on the substrate through the contact roller, it is possible to prevent the substrate from generating stretch marks, and also to suppress the vibration of the substrate, which helps to ensure the stability of the coating gap between the coating lip and the substrate, and thus ensure coating consistency.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solution of the embodiments of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the application of a coating die head provided in one embodiment of the utility model to coat a substrate.

[0039] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the coating die head shown.

[0040] Figure 3 yes Figure 2 A schematic diagram of the coating die shown in another perspective.

[0041] Figure 4 yes Figure 1 A schematic diagram of the contact roller in rolling contact with the substrate.

[0042] Figure 5 yes Figure 2 Schematic diagram of the three-dimensional exploded structure of the coating die head shown.

[0043] Figure 6 yes Figure 5A schematic diagram of the coating die shown in another perspective.

[0044] Figure 7 yes Figure 2 The coating die shown is a schematic diagram of the three-dimensional structure without the die assembly, drive mechanism and displacement sensor.

[0045] Figure 8 yes Figure 5 A schematic diagram of the three-dimensional exploded structure of the die head assembly shown.

[0046] Fig. 9 yes Figure 8 A schematic diagram of the die assembly shown from another perspective.

[0047] Fig.10 yes Figure 7 A schematic diagram of the coating die shown in another perspective.

[0048] Fig.11 yes Fig.10 Schematic diagram of the three-dimensional exploded structure of the coating die head shown.

[0049] Fig.12 yes Fig.11 Schematic diagram of the structure of the contact roller shown.

[0050] Fig.13 yes Figure 7 Shown is a cross-sectional view along line AA.

[0051] Fig.14 yes Figure 2 Shown is a cross-sectional view along line BB.

[0052] Fig.15 yes Figure 2 Shown is a cross-sectional view along line CC.

[0053] Fig.16 yes Figure 2 A partial cross-sectional view of the drive assembly at one end of the coating die is shown.

[0054] Fig.17 yes Figure 2 Shown is a cross-sectional view along line CC.

[0055] Description of main reference numerals:

[0056] 1- coating die head; 2- substrate; 20- back plate; 21- first groove; 22- mounting platform; 221- mounting block; 2211- bearing part; 2212- stopper; 222- mounting plate; 23- second groove; 24- first mounting groove; 25- bearing seat; 30- die head assembly; 31- first die head; 311- first slurry tank; 312- second slurry tank; 32- second die head; 33- hinge; 34- feed port; 35- coating lip; 36- Gasket; 361-first strip groove; 362-second strip groove; 363-opening; 40-contact roller; 41-contact section; 42-mounting section; 50-rotatable component; 51-bearing; 52-bearing cover; 60-driving mechanism; 61-screw; 62-first wedge block; 621-inclined surface; 63-second wedge block; 631-second mounting groove; 64-second driving member; 65-rotating shaft; 70-linear guide rail; 80-slider; 90-displacement sensor.

[0057] The following specific implementation manner will further illustrate the utility model in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0059] See also Figure 1 The embodiment of the utility model provides a coating die head 1, which is used in a coating device, and the coating die head 1 is used to coat a substrate 2. The substrate 2 can be in a strip or strip shape, and the material of the substrate 2 includes but is not limited to foil materials such as copper foil and aluminum foil. In the embodiment of the utility model, the strip foil is used as an example for description.

[0060] For details, please combine Figures 1 to 4In an embodiment of the utility model, the coating die 1 comprises a back plate 20, a die assembly 30 and a contact roller 40. The back plate 20 is used to connect the bracket of the coating device (not shown in the figure) so as to install the coating die 1 on the bracket. The die assembly 30 is fixedly mounted on the back plate 20, and the die assembly 30 has a coating lip 35. The contact roller 40 is rotatably mounted on the back plate 20, and the contact roller 40 and the coating lip 35 are located on the same side of the coating die 1. The extension direction of the contact roller 40 is perpendicular or nearly perpendicular to the conveying direction of the substrate 2 (that is, the width direction of the substrate 2), the contact roller 40 is used to roll contact with the substrate 2 and generate tension on the substrate 2 to flatten the substrate 2, the die assembly 30 is used to coat the flattened substrate 2 through the coating lip 35, and the die assembly 30 is spaced from the substrate 2 during the coating process. The extended length of the contact roller 40 is greater than or equal to the width of the substrate 2 , so that the contact roller 40 can completely flatten the substrate 2 in the width direction of the substrate 2 .

[0061] In the coating die head 1 provided in the embodiment of the utility model, the die head assembly 30 is spaced apart from the substrate 2, and the contact roller 40 in rolling contact with the substrate 2 is used to flatten the substrate 2, so that hard friction between the coating die head 1 and the substrate 2 can be avoided when coating the substrate 2, thereby not damaging the substrate 2, which is beneficial to improving the conductivity of the electrode sheet made of the substrate 2. Furthermore, by generating tension on the substrate 2 by the contact roller 40 in rolling contact with the substrate 2 to flatten the substrate 2, it can not only prevent the substrate 2 from generating stretch marks, but also suppress the vibration of the substrate 2, which helps to ensure the stability of the coating gap between the coating lip 35 and the substrate 2, thereby ensuring the coating consistency and improving the coating effect of the coating die head 1.

[0062] Please combine Figure 1 , Figures 5 to 7 In one embodiment of the present invention, the back plate 20 is a plate body that is roughly in the shape of a rectangular block, the contact roller 40 is installed on one side of the back plate 20 in the width direction, the die assembly 30 is installed on one side of the back plate 20 in the thickness direction, and the coating lip 35 is located on the side of the die assembly 30 close to the contact roller 40 and exceeds the side of the back plate 20 where the contact roller 40 is provided, so that it is located on the same side of the coating die 1 along the width direction of the back plate 20 as the contact roller 40.

[0063] like Figure 1 , Figure 5 and Figure 6As shown, in one embodiment of the present invention, the die assembly 30 includes a first die 31 that is roughly wedge-shaped and a second die 32 that is roughly rectangular. The first die 31 is detachably mounted on one side of the back plate 20 in the thickness direction, and the second die 32 is detachably mounted on the side of the first die 31 away from the back plate 20. The coating lip 35 is formed between the side of the first die 31 close to the contact roller 40 and the side of the second die 32 close to the contact roller 40. Optionally, the first die head 31 and / or the second die head 32 are provided with a slurry tank (described in detail later), and the first die head 31 and / or the second die head 32 are provided with a feed port 34, the feed port 34 and the coating lip 35 are respectively connected to the slurry tank, and the feed port 34 is used to inject coating slurry into the slurry tank, and the coating slurry further flows out of the die head assembly 30 through the coating lip 35 connected to the slurry tank, so as to be coated on the substrate 2. In this embodiment, the die head assembly 30 is composed of a detachable first die head 31 and a second die head 32, which is convenient for disassembly and assembly, and the slurry tank, the feed port 34 and the coating lip 35 can be flexibly designed according to actual needs. It should be noted that the second die head 32 can be detachably mounted on the first die head 31 using multiple connectors (not limited to bolts), which will not be described in detail.

[0064] Preferably, Figure 1 , Figure 5 and Figure 6 In the example, the plane where the side of the first die head 31 close to the contact roller 40 is located is coplanar with the plane where the side of the second die head 32 close to the contact roller 40 is located, that is, the first die head 31 and the second die head 32 are flat structures in the parts adjacent to the coating lip 35, which helps to improve the coating effect.

[0065] Preferably, please combine Figure 5 , Figure 8 and Fig. 9In one embodiment of the present invention, the die assembly 30 further includes at least one hinge 33, and the side of the first die 31 away from the contact roller 40 is rotatably connected to the side of the second die 32 away from the contact roller 40 through the at least one hinge 33. It is not difficult to understand that the rotatable connection between the first die 31 and the second die 32 is achieved through the at least one hinge 33, and after releasing the aforementioned multiple connecting parts, the second die 32 can be turned over to conveniently clean the side of the first die 31 and the second die 32 facing each other (that is, the inside of the die assembly 30), and at the same time, the second die 32 is not completely separated from the first die 31, and it is also convenient to re-detachably install the second die 32 on the first die 31 through the multiple connecting parts after cleaning. Specifically, in this embodiment, there are two hinges 33, and the two hinges 33 are respectively located on the opposite sides of the die assembly 30 in the length direction of the first die 31.

[0066] exist Figure 5 , Figure 8 and Fig. 9In the example, a first slurry groove 311 and a second slurry groove 312 are provided on the surface of the first die head 31 facing the second die head 32, the first slurry groove 311 and the second slurry groove 312 are arranged at intervals along the width direction of the first die head 31 and extend along the length direction of the first die head 31 respectively, and a feed port 34 connected to the first slurry groove 311 is provided on the side of the first die head 31 away from the contact roller 40. The die assembly 30 also includes a gasket 36 sandwiched between the first die 31 and the second die 32, the gasket 36 is provided with at least one first strip groove 361 extending along the width direction of the first die 31, a second strip groove 362 connecting the first strip groove 361 and corresponding to the second slurry groove 312, and an opening 363 located on the side of the gasket 36 close to the contact roller 40 and connected to the second strip groove 362, the first strip groove 361 connecting the first slurry groove 311 and the second slurry groove 312, so that the opening 363 is connected to the slurry groove of the first die 31 through the second strip groove 362 and the first strip groove 361, so that the side of the first die 31 close to the contact roller 40, the side of the second die 32 close to the contact roller 40, and the gasket 36 together surround the opening 363 to form a coating lip 35 facing the substrate 2. It is not difficult to understand that, in this embodiment, the gasket 36 is used to seal the periphery of the slurry tank except the portion corresponding to the coating lip 35, so as to ensure that the coating slurry injected into the slurry tank through the feed port 34 can only overflow from the coating lip 35, thereby avoiding the waste of the coating slurry and improving the utilization rate of the coating slurry; furthermore, the slurry tank of the first die head 31 is composed of the first slurry tank 311 and the second slurry tank 312 arranged at intervals, and is connected to the coating lip 35 through the first strip groove 361 and the second strip groove 362 on the gasket 36, so that the coating slurry injected into the slurry tank can slowly flow to the coating lip 35, avoiding the coating slurry from flowing to the coating lip 35 too fast when the injection pressure of the coating slurry is too large, and ensuring that the coating slurry overflowing through the coating lip 35 will not be lased onto the substrate 2, thereby ensuring the coating consistency.

[0067] In other embodiments, the first die head 31 may only have one slurry groove connected to the feed port 34 and the coating lip 35, and the gasket 36 only needs to have an opening 363 connected to the slurry groove, so as to simplify the structure of the die head assembly 30; or, the first die head 31 may not have a slurry groove, and the second die head 32 may have one slurry groove or at least two slurry grooves spaced apart on the surface facing the first die head 31, and the gasket 36 may be provided with corresponding strip grooves and openings, which are not described in detail; or, the first die head 31 and the second die head 32 may simultaneously have corresponding slurry grooves, so that the die head assembly 30 can be injected with more coating slurry, and the gasket 36 may be provided with corresponding strip grooves and openings, which are not described in detail.

[0068] Of course, in other embodiments, the die assembly 30 may also adopt other die structures, for example but not limited to the first die 31 and / or the second die 32 being provided with a slurry tank, and the first die 31 and / or the second die 32 being provided with a slit opening connected to the slurry tank on the side close to the contact roller 40, the die assembly 30 may not be provided with the gasket 36, after the first die 31 and the second die 32 are installed together, the side of the first die 31 close to the contact roller 40 and the side of the second die 32 close to the contact roller 40 are together surrounded at the slit opening to form a coating lip 35 facing the substrate 2, and this is not limited.

[0069] Please combine Figure 4 , Figures 10 to 12 In one embodiment of the present invention, the contact roller 40 adopts a segmented roller structure. Fig.11 and Fig.12 As shown, the contact roller 40 includes at least two contact segments 41 and at least one mounting segment 42. The contact segments 41 and the mounting segments 42 are coaxial and alternately distributed along the extension direction of the contact roller 40. There is one mounting segment 42 between each two adjacent contact segments 41. The contact segments 41 are used to roll with the substrate 2 to flatten the substrate 2 (see Figure 4 ), the diameter of the mounting section 42 is smaller than the diameter of the contact section 41. Fig.10 and Fig.11 As shown, the coating die head 1 further includes at least one set of rotatable components 50, each of which is correspondingly mounted on one of the mounting sections 42, and the mounting section 42 is rotatably mounted on the back plate 20 through the rotatable components 50. It can be understood that the contact roller 40 adopts a segmented structure, which can reduce the difficulty of processing to keep the outer diameter of the contact roller 40 consistent. Preferably, in Figures 10 to 12In the example, in addition to having one mounting segment 42 between every two adjacent contact segments 41, the contact roller 40 also has one mounting segment 42 at each of the two opposite ends in the extension direction. In this way, the contact roller 40 can be supported in sections by at least three mounting segments 42, which helps prevent the contact roller 40 from deforming.

[0070] It should be noted that in Figure 4 , Figures 10 to 12 In the example, when the contact roller 40 and the substrate 2 are in rolling contact to flatten the substrate 2, the outer wall surface of the rotatable component 50 close to the substrate 2 is at most flush with the outer peripheral surface of the substrate 2 in rolling contact with the contact segment 41, thereby avoiding hard friction between the rotatable component 50 and the substrate 2 and preventing damage to the substrate 2.

[0071] Alternatively, if Fig.12 As shown, in one embodiment of the present utility model, the dimension L1 of the installation section 42 located between two adjacent contact sections 41 along the extension direction of the contact roller 40 is less than or equal to the first preset dimension. By limiting the dimension L1 of the installation section 42 (i.e., the width of the installation section 42) not to exceed the first preset dimension, it is possible to avoid the problem that the installation section 42 with a small diameter is too long, causing the contact roller 40 to be easily broken at the installation section 42. The value of the first preset dimension can be 5mm, 7mm, 9mm or other reasonable dimensions less than or equal to 10mm, which can be set according to actual needs.

[0072] It can be understood that when the dimension L2 of the contact segment 41 along the extension direction of the contact roller 40 is too large, it will increase the difficulty of processing the contact segment 41 with a uniform outer diameter, and when the dimension L2 of the contact segment 41 is too small, it will cause the contact roller 40 to be provided with multiple contact segments 41 and multiple installation segments 42, which will also increase the difficulty of processing. Therefore, the dimension L2 of the contact segment 41 can also be reasonably designed according to actual needs, which will not be elaborated.

[0073] Optionally, in Fig.10 and Fig.11In the example, there is a gap between the outer wall surface of the rotatable component 50 close to the substrate 2 and the outer peripheral surface of the contact segment 41 in rolling contact with the substrate 2, and the value of the gap is less than or equal to the second preset size. By limiting the value of the gap to not exceed the second preset size, it can be ensured that the outer wall surface of the rotatable component 50 close to the substrate 2 will not have hard friction with the substrate 2, and at the same time, it can be avoided that the gap is too large, that is, the diameter of the mounting segment 42 is too small, and the contact roller 40 is easy to break in the mounting segment 42. Among them, the value of the second preset size can be 0.01mm, 0.02mm, 0.03mm or other reasonable sizes less than or equal to 0.05mm, which can be set according to actual needs.

[0074] like Fig.11 As shown, in one embodiment of the utility model, the rotatable component 50 may include a bearing 51 provided on the outer peripheral wall of the mounting section 42, and a bearing cover 52 for fixing the bearing 51 to the back plate 20, and the bearing cover 52 is fixedly connected to the back plate 20 by any detachable means such as bolt connection and snap connection. It should be noted that, in one embodiment, the contact section 41 and the mounting section 42 are integrally formed, and the bearing 51 is an annular bearing structure formed by removing part of the material in the circumferential direction of the mounting section 42; in another embodiment, the contact section 41 and the mounting section 42 are non-integrated structures and are connected together by bonding or other means, and the bearing 51 may be a bearing device that is sleeved on the mounting section 42 before the mounting section 42 is connected to the contact section 41.

[0075] Preferably, Fig.11 In the illustrated embodiment, the back plate 20 is provided with a first mounting groove 24 at a position corresponding to the contact section 41, and at least a portion of the contact section 41 is received in the corresponding first mounting groove 24, which can play a role in installation and positioning. Similarly, the back plate 20 can be provided with a ring-groove-shaped bearing seat 25 at a position corresponding to the mounting section 42, and at least a portion of the bearing 51 on the mounting section 42 is received in the corresponding bearing seat 25, which can also play a role in installation and positioning.

[0076] Preferably, in an embodiment of the present invention, the contact roller 40 is made of a wear-resistant material, or the contact roller 40 is covered with a wear-resistant layer at least on the outer peripheral surface of the portion for rolling contact with the substrate 2, so as to reduce the friction force of the substrate 2 on the outer peripheral surface of the roller body of the contact roller 40, thereby reducing the wear of the outer peripheral surface caused by the friction force. Wherein, the material of the wear-resistant material and the material of the wear-resistant layer can be non-metallic materials, not limited to ceramic materials or carbon fiber materials with low friction coefficient, low density and small moment of inertia such as zirconium oxide and silicon nitride, and no limitation is made to this. It is also preferred that in an embodiment of the present invention, the coating die head 1 can also include a first driving member (such as a driving motor), and the first driving member is used to drive the rotation of the contact roller 40, so as to adjust the differential speed between the substrate 2 and the contact roller 40 and reduce the hard friction between the substrate 2 and the contact roller 40. Of course, the coating die head 1 may not be provided with the first driving member, and the contact roller 40 rotates relative to the back plate 20 driven by the substrate 2 , which can also reduce the hard friction between the substrate 2 and the contact roller 40 .

[0077] It should be noted that if Figure 1 As shown, in the embodiment of the utility model, the contact position between the contact roller 40 and the substrate 2 is defined as the first reference point, the coating position between the die assembly 30 and the substrate 2 (i.e., the position of the substrate 2 corresponding to the coating lip 35) is defined as the second reference point, and the distance D between the first reference point and the second reference point is less than or equal to the third preset size. By limiting the distance D between the first reference point and the second reference point to be within the range of the third preset size, it can be ensured that the coating die 1 has a good coating effect. Among them, the value of the third preset size can be 10mm, 20mm or other reasonable sizes, preferably not more than 30mm.

[0078] Please combine Figure 3 , Figures 5 to 7 In one embodiment of the present invention, the die assembly 30 is movably mounted on the back plate 20, and the coating die 1 further comprises a driving mechanism 60, which is used to drive the die assembly 30 to move on the back plate 20 to move away from or close to the substrate 2, so as to adjust the coating gap between the coating lip 35 and the substrate 2. In this embodiment, the coating die 1 can be applied to coating of a plurality of substrates 2 that need to have different coating gaps, and can also be applied to coating different areas of the same substrate 2 with coating slurry layers of different thicknesses, thereby expanding the application scope of the coating die 1.

[0079] Specifically, Figures 5 to 7As shown, in this embodiment, a first groove 21 is provided on one side of the back plate 20 for mounting the die assembly 30, and the coating die 1 further comprises a linear guide rail 70 and a slider 80 disposed in the first groove 21, the extension direction of the linear guide rail 70 being perpendicular to the extension direction of the contact roller 40, the slider 80 being movably mounted on the linear guide rail 70, and the surface of the slider 80 facing away from the first groove 21 being flush with or exceeding the surface of the back plate 20 facing the die assembly 30, the die assembly 30 being mounted on the slider 80, and the driving mechanism 60 being used to drive the die assembly 30 to move along the extension direction of the linear guide rail 70, so as to move away from or close to the substrate 2, so as to adjust the coating gap between the coating lip 35 and the substrate 2. Please refer to Fig.13 In this embodiment, preferably, the surface of the slider 80 facing away from the first groove 21 exceeds the surface of the back plate 20 facing the die assembly 30, and a distance L3 is left between the two surfaces. The slider 80 protrudes from the back plate 20, which is conducive to installing the first die 31 of the die assembly 30. It can be understood that the distance L3 between the surface of the slider 80 facing away from the first groove 21 and the surface of the back plate 20 facing the die assembly 30 will affect the distance D between the first reference point and the second reference point. Therefore, in order to ensure that the coating die 1 has a better coating effect, the value of the distance L3 cannot be too large. Exemplarily, the distance L3 is preferably less than or equal to 1 mm.

[0080] Among them, Fig.14 As shown, in one embodiment of the present invention, the first die head 31 is preferably mounted on the slider 80 in a detachable manner such as bolt connection, so as to facilitate the disassembly and installation of the die head assembly 30 at any time.

[0081] More specifically, in Figure 3 , Figures 5 to 7 In the illustrated embodiment, the back plate 20 is provided with a mounting platform 22 at least at one end in the extension direction of the contact roller 40, and the driving mechanism 60 includes at least one group of driving components, and the driving components correspond one-to-one to the mounting platform 22, and the driving components include a screw 61, a first wedge block 62, a second wedge block 63 and a second driving member 64 (for example, a driving motor).

[0082] Please combine Figure 7 , Fig.15 and Fig.16In the present embodiment, the mounting platform 22 comprises a mounting block 221 and a mounting plate 222 which are arranged at one end of the back plate 20 in the extension direction, the mounting block 221 comprises a bearing portion 2211 and a stop portion 2212, the bearing portion 2211 extends in a direction perpendicular to a side surface of the back plate 20 away from the die head assembly 30, the stop portion 2212 extends approximately in a direction perpendicular to the bearing portion 2211 and in a direction away from the contact roller 40, a side surface of the mounting plate 222 away from the die head assembly 30 is flush with a side surface of the back plate 20 away from the die head assembly 30, and the mounting plate 222 and the stop portion 2212 are provided with corresponding axial holes.

[0083] like Figure 7 , Fig.15 and Fig.16 As shown, in this embodiment, the opposite ends of the screw rod 61 are respectively installed at two axial holes on the mounting plate 222 and the stopper 2212, so as to be rotatably installed on the corresponding mounting platform 22. The first wedge block 62 is provided with a threaded through hole for installing the screw rod 61. The first wedge block 62 is threadedly connected to the screw rod 61 and is slidably arranged on the bearing portion 2211 of the mounting platform 22. The first wedge block 62 is provided with an inclined surface 621 on the side facing away from the substrate 2. The extending direction of the inclined surface 621 forms a preset angle α with the axial direction of the screw rod 61 (i.e., the axial direction of the threaded through hole of the first wedge block 62). The second wedge block 63 is installed at one end of the die head assembly 30 corresponding to the mounting platform 22, specifically, it is detachably installed at the end of the first die head 31. The second wedge block 63 can slide relative to the inclined surface 621 of the first wedge block 62. The second driving member 64 is mounted on the side of the mounting plate 222 of the corresponding mounting platform 22 facing away from the mounting block 221, and the output shaft of the second driving member 64 is connected to the screw rod 61 to drive the screw rod 61 to rotate. In this embodiment, since the first wedge block 62 is placed on the bearing portion 2211, the bearing portion 2211 can prevent the first wedge block 62 from rotating around the axial direction of the threaded through hole. Therefore, the rotation of the screw rod 61 can drive the first wedge block 62 to move along the axial direction of the screw rod 61, and the second wedge block 63 can slide relative to the inclined surface 621 of the first wedge block 62, so that the first wedge block 62 drives the second wedge block 63 and the die assembly 30 connected to the second wedge block 63 to move along the extension direction of the linear guide rail 70, so that the die assembly 30 is moved away from or close to the substrate 2, and the coating gap between the coating lip 35 and the substrate 2 can be adjusted.

[0084] Preferably, Figure 7 , Fig.15 and Fig.16In the example, the driving mechanism 60 includes two groups of driving components, and each end of the back plate 20 in the extension direction of the contact roller 40 is provided with a corresponding group of driving components, which helps to improve the stability of the driving mechanism 60 driving the die head assembly 30 away from or close to the substrate 2, thereby improving the reliability of adjusting the coating gap.

[0085] It can be understood that in other embodiments, one or more mounting platforms 22 may be provided at other locations of the back plate 20, and the second wedge block 63 is installed at a location of the die head assembly 30 corresponding to the mounting platform 22. For example, a mounting platform 22 is provided in the middle or near the middle of the side of the back plate 20 away from the contact roller 40, and the second wedge block 63 is installed in the middle or near the middle of the side of the first die head 31 away from the contact roller 40, so that the second wedge block 63 corresponds to the mounting platform 22, and can then slide with the first wedge block 62 slidably provided on the mounting platform 22, thereby achieving the purpose of adjusting the coating gap between the coating lip 35 and the substrate 2. In other words, in the embodiment of the utility model, one or more mounting platforms 22 can be set at any suitable position of the back plate 20. As long as the second wedge block 63 in the driving assembly is installed at the position of the first die head 31 corresponding to the mounting platform 22, the die head assembly 30 can be driven away from or close to the substrate 2 by the driving mechanism 60, so as to achieve the purpose of adjusting the coating gap between the coating lip 35 and the substrate 2, and there is no limitation on this.

[0086] Preferably, see Figure 6 and Fig.15In one embodiment of the present invention, a second mounting groove 631 is provided on a side of the second wedge block 63 facing the first wedge block 62, and the driving assembly further comprises a rotating shaft 65, wherein the rotating shaft 65 is rotatably mounted in the second mounting groove 631 of the second wedge block 63, and the circumferential surface of the rotating shaft 65 is in rolling contact with the inclined surface 621 of the first wedge block 62, so that the rotation of the screw rod 61 drives the first wedge block 62 to move along the axial direction of the screw rod 61, and the movement of the first wedge block 62 drives the rotating shaft 65 to rotate, and the movement of the first wedge block 62 simultaneously drives the rotating shaft 65, the second wedge block 63 connected to the rotating shaft 65, and the die head assembly 30 connected to the second wedge block 63 to move along the extension direction of the linear guide rail 70. In this embodiment, the rolling friction between the circumferential surface of the rotating shaft 65 and the inclined surface 621 of the first wedge block 62 is used to enable the second wedge block 63 to slide relative to the inclined surface 621 of the first wedge block 62, thereby reducing the wear of the inclined surface 621, which not only prolongs the service life of the driving mechanism, but also helps to ensure the transmission stability of the driving mechanism, thereby improving the adjustment accuracy of the coating gap between the coating lip 35 and the substrate 2.

[0087] exist Figure 7 , Fig.15 and Fig.16 In the embodiment shown, the distance that the first wedge block 62 moves along the axial direction of the screw rod 61 is S, the preset angle between the inclined surface 621 of the first wedge block 62 and the axial direction of the screw rod 61 is α, and the distance that the die head assembly 30 moves along the direction perpendicular to the axial direction of the screw rod 61 is H, then S, α, and H satisfy the relationship: H = S*tanα. That is, according to the distance S that the first wedge block 62 moves along the axial direction of the screw rod 61 and the preset angle α between the inclined surface 621 and the axial direction of the screw rod 61, the moving distance H of the die head assembly 30 along the direction perpendicular to the axial direction of the screw rod 61 can be calculated. Among them, the distance S that the first wedge block 62 moves along the axial direction of the screw rod 61 is equal to the product of the pitch of the screw rod 61 and the number of rotations of the screw rod 61, which will not be elaborated.

[0088] Preferably, in this embodiment, the axial direction of the screw 61 is parallel to the plane where the portion of the substrate 2 in the coating state is located, so that the moving distance H of the die assembly 30 in the direction perpendicular to the axial direction of the screw 61 is equivalent to the adjustment value of the coating gap between the coating lip 35 and the substrate 2. In one embodiment, when the distance S of the axial movement of the first wedge block 62 along the screw 61 is 10 μm and the tangent value tanα of the preset angle α is 0.1, the moving distance H of the die assembly 30 in the direction perpendicular to the axial direction of the screw 61 is 1 μm. In another embodiment, when the distance S of the axial movement of the first wedge block 62 along the screw 61 is 20 μm and the tangent value tanα of the preset angle α is 0.1, the moving distance H of the die assembly 30 in the direction perpendicular to the axial direction of the screw 61 is 2 μm. In another embodiment, when the distance S of the first wedge block 62 moving along the axial direction of the screw rod 61 is 10 μm and the tangent value tanα of the preset angle α is 0.2, the moving distance H of the die assembly 30 in the direction perpendicular to the axial direction of the screw rod 61 is 2 μm. In other words, by changing the distance S of the first wedge block 62 moving along the axial direction of the screw rod 61 and / or the preset angle α between the inclined surface 621 and the axial direction of the screw rod 61, the moving distance of the die assembly 30 in the direction perpendicular to the axial direction of the screw rod 61 can be changed, thereby changing the adjustment accuracy of the coating gap between the coating lip 35 and the substrate 2 to meet the requirements of different adjustment accuracy.

[0089] Further, please combine Figure 1 , Figure 5 and Fig.17 In one embodiment of the utility model, the back plate 20 is further provided with a second groove 23, the second groove 23 has an opening penetrating through the back plate 20 and used to install the contact roller 40, the coating die head 1 further includes a displacement sensor 90 disposed in the second groove 23, the displacement sensor 90 is used to detect the distance between the substrate 2 and the coating lip 35 during the coating process, and the displacement sensor 90 is used to connect to a controller to feed back the detected distance between the substrate 2 and the coating lip 35 to the controller. The displacement sensor 90 can be a laser displacement sensor, and the controller can be an overall controller of the coating device where the coating die head 1 is located, which is not limited.

[0090] The controller is electrically connected to the second driving member 64, and is used to control the second driving member 64 to drive the rotation of the lead screw 61 according to the distance between the substrate 2 and the coating lip 35 fed back by the displacement sensor 90, thereby adjusting the movement of the die assembly 30 along the extension direction of the linear guide 70. That is to say, in this embodiment, the distance change between the substrate 2 and the coating lip 35 is detected in real time by the displacement sensor 90, so that the controller can control the driving mechanism 60 in a closed loop according to the distance change between the substrate 2 and the coating lip 35, and realize the dynamic adjustment of the coating gap between the coating lip 35 and the substrate 2, which helps to improve the stability of the coating gap and thus improve the coating consistency.

[0091] Preferably, Figure 5 As shown, in one embodiment of the present invention, the back plate 20 is provided with a plurality of second grooves 23 at intervals along the extension direction of the contact roller 40, and a displacement sensor 90 is correspondingly provided in each second groove 23, and the plurality of displacement sensors 90 are used to detect the distance between the substrate 2 and the coating lip 35. By using a plurality of displacement sensors 90 to detect the distance between the substrate 2 and the coating lip 35, the detection accuracy of the distance can be ensured, thereby ensuring the reliability of the dynamic adjustment of the coating gap, which helps to further improve the coating consistency.

[0092] It can be understood that in the coating die head 1 provided by the present invention, the die head assembly 30 can also be movably mounted on the back plate 20 using other connecting structures, such as but not limited to a connecting structure of a slide groove and a slider cooperating with the slide groove. Similarly, the driving mechanism 60 can also use other driving methods to drive the movement of the die head assembly 30 relative to the substrate 2, such as but not limited to using a cylinder to drive the die head assembly 30, which will not be elaborated herein.

[0093] It can also be understood that, similar to the existing coating die heads, the coating die head 1 provided by the present invention also has other structural features, including but not limited to the connection structure of the back plate 20 for connecting to the bracket, which will not be elaborated herein.

[0094] Furthermore, an embodiment of the utility model also provides a coating device, comprising a bracket and a coating die head 1 as described in any of the above embodiments, wherein the back plate of the coating die head 1 is used to connect the bracket, thereby fixing the coating die head 1 on the bracket. It is understandable that, since the coating die head 1 is the coating die head 1 as described in any of the above embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail.

[0095] It should be noted that, similar to the existing coating device, the coating device provided in the embodiment of the utility model may also include a traction unit, a driving unit and a plurality of tension rollers, the traction unit is used to traction the substrate to move, the driving unit is used to provide power for the substrate to move toward the coating die head, and the plurality of tension rollers are used to traction the substrate and keep the substrate at a set tension. Of course, the coating device may also include other components such as a dryer, a shearing machine, and a winder, which will not be described in detail.

[0096] In the description of the present invention, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation 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 one or more embodiments or examples in a suitable manner.

[0097] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A coating die head for coating a substrate, characterized in that: The coating die comprises: Back panel; a die assembly mounted on the back plate, the die assembly having a coating lip; and A contact roller rotatably mounted on the back plate, wherein the contact roller and the coating lip are located on the same side of the coating die head; The contact roller is used to roll in contact with the substrate and generate tension on the substrate to flatten the substrate, the die assembly is used to coat the flattened substrate through the coating lip, and the die assembly is spaced apart from the substrate during the coating process.

2. The coating die head according to claim 1, characterized in that The contact roller comprises at least two contact segments and at least one mounting segment, wherein the contact segments and the mounting segments are coaxial and alternately distributed along the extension direction of the contact roller, and there is one mounting segment between each two adjacent contact segments, wherein the contact segment is used to roll in contact with the substrate to flatten the substrate, and the diameter of the mounting segment is smaller than the diameter of the contact segment; Wherein, the coating die head further comprises at least one set of rotatable components, each of the rotatable components is correspondingly sleeved on one of the mounting sections, and the mounting section is rotatably mounted on the back plate through the rotatable components.

3. The coating die head according to claim 2, characterized in that The size of the installation section located between two adjacent contact sections along the extension direction of the contact roller is less than or equal to a first preset size; And / or, there is a gap between the outer wall surface of the rotatable component close to the substrate and the rolling contact of the contact section with the outer peripheral surface of the substrate, and the value of the gap is less than or equal to a second preset size.

4. The coating die head according to claim 2, characterized in that The rotatable assembly includes a bearing disposed on the outer peripheral wall of the mounting section, and a bearing cover for fixing the bearing to the back plate; And / or, the back plate is provided with a mounting groove at a position corresponding to the contact section, and at least a part of the contact section is accommodated in the corresponding mounting groove.

5. The coating die head according to claim 1, characterized in that: The contact roller is made of a wear-resistant material, or the contact roller is covered with a wear-resistant layer at least on the outer peripheral surface of the portion for rolling contact with the substrate; And / or, the coating die head further comprises a first driving member, and the first driving member is used to drive the rotation of the contact roller.

6. The coating die head according to claim 1, characterized in that The contact position between the contact roller and the substrate is defined as a first reference point, the coating position between the die assembly and the substrate is defined as a second reference point, and the distance between the first reference point and the second reference point is less than or equal to a third preset size.

7. The coating die head according to claim 1, characterized in that The die assembly comprises a first die and a second die, wherein the first die is detachably mounted on one side of the back plate in the thickness direction, and the second die is detachably mounted on a side of the first die away from the back plate, wherein the coating lip is formed between a side of the first die close to the contact roller and a side of the second die close to the contact roller; The first die head and / or the second die head is provided with a slurry tank, and the first die head and / or the second die head is provided with a feed port, and the feed port and the coating lip are respectively connected to the slurry tank.

8. The coating die head according to claim 7, characterized in that The die assembly further comprises at least one hinge, and a side of the first die away from the contact roller is rotationally connected to a side of the second die away from the contact roller via the at least one hinge.

9. The coating die head according to claim 7, characterized in that: The die assembly also includes a gasket sandwiched between the first die and the second die, wherein the side of the gasket close to the contact roller is provided with an opening connected to the slurry tank, the side of the first die close to the contact roller, the side of the second die close to the contact roller and the gasket together surround the opening to form the coating lip, and the gasket is used to seal the periphery of the slurry tank except the part corresponding to the coating lip.

10. The coating die head according to claim 7, characterized in that: A plane where a side of the first die head close to the contact roller is located is coplanar with a plane where a side of the second die head close to the contact roller is located.

11. The coating die head according to any one of claims 1 to 10, characterized in that: The die assembly is movably mounted on the back plate, and the coating die also includes a driving mechanism, which is used to drive the die assembly to move on the back plate.

12. The coating die head according to claim 11, characterized in that A first groove is formed on one side of the back plate for mounting the die assembly, and the coating die assembly further comprises a linear guide rail and a slider disposed in the first groove, wherein the extension direction of the linear guide rail is perpendicular to the extension direction of the contact roller, and the slider is movably mounted on the linear guide rail, and the surface of the slider facing away from the first groove is flush with or exceeds the surface of the back plate facing the die assembly; Wherein, the die head assembly is installed on the slider, and the driving mechanism is used to drive the die head assembly to move along the extension direction of the linear guide rail.

13. The coating die head according to claim 12, characterized in that: The back plate is provided with at least one mounting platform, the driving mechanism comprises at least one set of driving components, the driving components correspond to the mounting platforms one by one, and the driving components comprise a screw rod, a first wedge block, a second wedge block and a second driving member; Among them, the screw rod is rotatably mounted on the corresponding mounting platform, the first wedge block is threadedly connected to the screw rod and is slidably arranged on the mounting platform, a slope is provided on the side of the first wedge block facing away from the substrate, and the extension direction of the slope forms a preset angle with the axial direction of the screw rod, the second wedge block is installed at a position of the die head assembly corresponding to the mounting platform and can slide relative to the slope of the first wedge block, the second driving member is installed on the corresponding mounting platform and is used to drive the screw rod to rotate, and the rotation of the screw rod drives the first wedge block to move along the axial direction of the screw rod, thereby causing the first wedge block to drive the second wedge block and the die head assembly connected to the second wedge block to move along the extension direction of the linear guide rail.

14. The coating die head according to claim 13, characterized in that: The driving assembly also includes a rotating shaft, which is rotatably mounted on the second wedge block and in rolling contact with the inclined surface of the first wedge block. The rotation of the screw drives the first wedge block to move along the axial direction of the screw rod. The movement of the first wedge block drives the rotating shaft to rotate. The movement of the first wedge block simultaneously drives the rotating shaft, the second wedge block connected to the rotating shaft, and the die head assembly connected to the second wedge block to move along the extension direction of the linear guide rail.

15. The coating die head according to claim 13 or 14, characterized in that: The back plate is provided with a second groove, the second groove has an opening penetrating through the back plate and on one side for mounting the contact roller, the coating die head further comprises a displacement sensor disposed in the second groove, the displacement sensor is used to detect the distance between the substrate and the coating lip during the coating process, and the displacement sensor is used to connect to a controller and feed back the detected distance between the substrate and the coating lip to the controller; Wherein, the controller is electrically connected to the second driving member, and the controller is used to control the second driving member to drive the rotation of the screw according to the distance between the substrate and the coating lip fed back by the displacement sensor, thereby adjusting the movement of the die head assembly along the extension direction of the linear guide rail.

16. The coating die head according to claim 15, characterized in that The back plate is provided with a plurality of second grooves at intervals along the extension direction of the contact roller, and a displacement sensor is correspondingly arranged in each of the second grooves. The plurality of displacement sensors are used to detect the distance between the substrate and the coating lip.

17. The coating die head according to claim 13 or 14, characterized in that: The distance that the first wedge moves along the axial direction of the screw is S, the preset angle between the inclined surface and the axial direction of the screw is α, and the distance that the die head assembly moves in a direction perpendicular to the axial direction of the screw is H, wherein S, α, and H satisfy the relationship: H=S*tanα.

18. A coating device, comprising a bracket, characterized in that: It also includes a coating die as described in any one of claims 1 to 17, wherein the coating die is mounted on the bracket.

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