An adjustable coating gap die and coating apparatus

Abstract

The utility model relates to the technical field of coating equipment, especially to adjustable coating gap's die head and coating equipment. The utility model provides adjustable coating gap's die head, which comprises: first die head subassembly, second die head subassembly and adjustment assembly, the first die head subassembly and second die head subassembly form first coating gap, a plurality of through -holes are provided on the first die head subassembly, the adjustment assembly includes adjusting block, plug rod and actuating mechanism, adjusting block and plug rod are selectively arranged in each through -hole, and adjusting block and plug rod can interchange, adjusting block is used for adjusting the width of first coating gap, the actuating mechanism is connected to adjusting block, and is used for driving adjusting block to remove. Through the selectivity and interchangeability of adjusting block and plug rod in the through -hole, the flexible configuration of adjusting block distribution density is realized, so that the user can set different adjustment density dynamically in different sections of the die head according to the actual coating demand.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, and in particular to an adjustable coating gap die and coating equipment. Background Technology

[0002] In the field of coating technology, especially in high-precision coating of lithium battery electrodes, coating dies with automatic adjustment functions are often used. These dies use a series of adjustment blocks driven by actuators on the die assembly to finely adjust the width of the coating gap in real time, thereby ensuring the uniformity of coating quality.

[0003] Currently, to achieve higher coating accuracy, a technological trend in the field is to increase the number of adjustment blocks and reduce their spacing, i.e., to arrange more adjustment blocks and actuators per unit length of the die head. However, this approach has significant drawbacks: First, the increase in the number of actuators directly leads to a significant increase in the cost of the die head; second, to accommodate more adjustment blocks, more densely packed through holes need to be machined on the die head assembly. These through holes severely weaken the structural integrity of the die head assembly, making it prone to deformation under long-term working pressure. Deformation of the die head not only leads to a decrease in the quality of the coated electrode sheet, but may also cause slurry leakage from weak points.

[0004] Therefore, there is a contradiction in the existing technology: improving coating accuracy requires increasing the density of the adjustment block, but increasing the density will lead to high costs and a fragile die head structure that is prone to deformation and leakage. Utility Model Content

[0005] The purpose of this invention is to provide an adjustable coating gap die and coating equipment to solve the technical problem in the prior art that the coating die cannot flexibly meet the requirements of low cost, high structural strength and local high precision adjustment due to the fixed distribution density of the adjustment blocks.

[0006] In a first aspect, the present invention provides an adjustable coating gap die head, comprising: a first die head assembly, a second die head assembly, and an adjustment assembly; The first die head assembly and the second die head assembly are disposed opposite to each other, and a first coating gap is formed between the first die head assembly and the second die head assembly; Along the length of the first coating gap, the first die assembly is provided with a plurality of through holes; The adjustment assembly includes an adjustment block, a plug rod, and an actuator. The adjustment block and the plug rod are selectively disposed in each of the through holes, and the adjustment block and the plug rod are interchangeable. The adjustment block is used to adjust the width of the first coating gap. By changing the number and position of the adjustment block and the plug rod disposed in the through hole, the distribution density of the adjustment block in the first coating gap can be adjusted. The actuator is connected to the adjustment block and is used to drive the adjustment block to move, so as to adjust the width of the first coating gap corresponding to the adjustment block.

[0007] In an optional embodiment, all the through holes are grouped into a plurality of adjustment units arranged along the length direction of the first coating gap, and a gap is provided between adjacent adjustment units. Each of the adjustment units includes at least three of the through holes.

[0008] In an optional implementation, the adjustment unit includes three of the through holes; The adjustment block includes a first adjustment block and a second adjustment block, and along the length direction of the first coating gap, the length of the adjustment part of one first adjustment block is equal to the sum of the lengths of the adjustment parts of the two second adjustment blocks; The adjustment unit can be in either a first configuration state or a second configuration state: In the first configuration state, one of the first adjustment blocks is disposed in the through hole located in the middle, and the two plug rods are respectively disposed in the two through holes located on the outer sides; In the second configuration state, the two second adjustment blocks are respectively disposed in the two through holes located on the outer side, and the one plug rod is disposed in the through hole located in the middle.

[0009] In an optional implementation, the adjustment unit includes five of the through holes; The adjustment block includes a first adjustment block, a second adjustment block, and a third adjustment block. Along the length direction of the first coating gap, the length of the adjustment part of one first adjustment block is equal to the sum of the lengths of the adjustment parts of two second adjustment blocks, and the length of the adjustment part of one first adjustment block is equal to the sum of the lengths of the adjustment parts of three third adjustment blocks. The adjustment unit can be in a first configuration state, a second configuration state, or a third configuration state: In the first configuration state, one of the first adjustment blocks is disposed in the through hole located in the middle, and four of the plug rods are respectively disposed in the remaining through holes; In the second configuration state, the two second adjustment blocks are respectively disposed in the two through holes located on the second outermost side, and the three plug rods are respectively disposed in the through hole located in the middle and the two through holes located on the outermost side; In the third configuration state, the three third adjustment blocks are respectively disposed in the middle through hole and the two outermost through holes, and the two plug rods are respectively disposed in the two next outermost through holes.

[0010] In an optional embodiment, a sealing element is provided between the connecting part of the adjusting block and the inner wall of the through hole; and / or; A sealing element is provided between the plug rod and the inner wall of the through hole.

[0011] In an optional embodiment, the adjustment assembly further includes a plug for securing the plug rod.

[0012] In an optional embodiment, the second die assembly is further provided with a push-pull rod adjustment assembly, which is used to coarsely adjust the first coating gap.

[0013] In an optional embodiment, the first mold head assembly includes an upper mold and a middle mold, and the second mold head assembly includes a lower mold; The middle mold and the lower mold are disposed opposite to each other, and the first coating gap is formed between the middle mold and the lower mold. Along the length direction of the first coating gap, the middle mold is provided with a plurality of through holes. The upper mold and the middle mold are arranged opposite to each other, and a second coating gap is formed between the upper mold and the middle mold.

[0014] In an optional embodiment, the angle between the upper lip surface and the lower lip surface of the middle mold is 35°-55°.

[0015] Secondly, this utility model provides a coating device, including a die head with adjustable coating gap as described in any of the foregoing embodiments.

[0016] Compared with the prior art, the technical advantages of the adjustable coating gap die and coating equipment provided by this utility model are as follows: The adjustable coating gap die head provided by this utility model includes: a first die head assembly, a second die head assembly, and an adjustment assembly; the first die head assembly and the second die head assembly are arranged opposite to each other, and a first coating gap is formed between the first die head assembly and the second die head assembly; a plurality of through holes are provided on the first die head assembly along the length direction of the first coating gap; the adjustment assembly includes an adjustment block, a plug rod, and an actuator, the adjustment block and the plug rod are selectively disposed in each through hole, and the adjustment block and the plug rod are interchangeable; the adjustment block is used to adjust the width of the first coating gap, and the distribution density of the adjustment block in the first coating gap can be adjusted by changing the number and position of the adjustment block and the plug rod disposed in the through hole; the actuator is connected to the adjustment block and is used to drive the adjustment block to move, so as to adjust the width of the first coating gap at the adjustment block.

[0017] Because the adjusting blocks and plugs are selectively placed and interchangeable, by changing their number and position within the through-holes, operators can initially configure a lower adjusting block density—using fewer adjusting blocks and more plugs—to match a smaller number of actuators, significantly reducing costs. When higher precision is required in a particular section during production, the plugs can be replaced with adjusting blocks only in that section, locally increasing the adjusting block density for precise local fine-tuning without requiring a high density of actuators across the entire die head. The selectivity and interchangeability of adjusting blocks and plugs within the through-holes enable flexible configuration of the adjusting block density, allowing users to dynamically set different adjustment densities in different sections of the die head according to actual coating needs. This allows the die head to operate with lower overall cost and higher structural strength while simultaneously meeting the specific high-precision adjustment requirements of localized areas. Furthermore, in sections where high-precision adjustment is not required, plug rods can be used to seal the through holes. Compared to installing all adjustment blocks, the presence of plug rods provides more solid support structure, effectively enhancing the overall rigidity and strength of the first die head assembly. This allows the first die head assembly to maintain good structural integrity even with multiple through holes inside, significantly reducing the risk of deformation caused by structural weakness, enhancing the structural reliability and stability of the die head, and thus avoiding coating quality degradation and material leakage problems caused by deformation. Simultaneously, because the distribution density of the adjustment blocks is adjustable, the same die head hardware can adapt to various coating processes with different precision requirements by configuring the number and position of adjustment blocks and plug rods, greatly improving the application flexibility and versatility of the die head.

[0018] The coating equipment provided by this utility model includes the aforementioned adjustable coating gap die head. Therefore, the technical advantages and effects achieved by it include the technical advantages and effects achieved by the aforementioned adjustable coating gap die head, which will not be described in detail here.

[0019] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the overall structure of the die head with adjustable coating gap provided for an embodiment of this utility model; Figure 2 Provided for the embodiments of this utility model Figure 1 A sectional view; Figure 3 A schematic diagram of the first configuration state when the adjustment unit provided in the embodiment of this utility model includes three through holes; Figure 4 This is a schematic diagram of the second configuration state when the adjustment unit provided in the embodiment of the present utility model includes three through holes.

[0022] Icons: 1-Adjustment component; 2-Blocking rod; 3-Actuator; 4-Adjustment unit; 5-First adjustment block; 6-Second adjustment block; 7-Block; 8-Push-pull rod adjustment component; 9-Upper mold; 10-Middle mold; 11-Lower mold; 12-Sealing ring; 13-Upper feed port; 14-Lower feed port. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0028] The specific structure is as follows: Figures 1 to 4 As shown.

[0029] This embodiment provides an adjustable coating gap die head, including: a first die head assembly, a second die head assembly, and an adjustment assembly 1; the first die head assembly and the second die head assembly are arranged opposite to each other, and a first coating gap is formed between the first die head assembly and the second die head assembly; a plurality of through holes are provided on the first die head assembly along the length direction of the first coating gap; the adjustment assembly 1 includes an adjustment block, a plug rod 2, and an actuator 3, the adjustment block and the plug rod 2 are selectively disposed in each through hole, and the adjustment block and the plug rod 2 are interchangeable, the adjustment block is used to adjust the width of the first coating gap, and the distribution density of the adjustment block in the first coating gap can be adjusted by changing the number and position of the adjustment block and the plug rod 2 disposed in the through hole; the actuator 3 is connected to the adjustment block and is used to drive the adjustment block to move, so as to adjust the width of the first coating gap at the adjustment block.

[0030] In this embodiment, since the adjusting blocks and plug rods 2 are selectively arranged and interchangeable, by changing their number and position within the through-hole, the operator can initially configure a lower adjusting block distribution density, i.e., using fewer adjusting blocks and more plug rods 2, thereby matching a smaller number of actuators 3, significantly reducing costs. When it is found during production that a certain section requires higher precision, the plug rods 2 can be replaced with adjusting blocks only in that local section, locally increasing the adjusting block distribution density in that section, achieving precise local fine-tuning without needing to configure a high density of actuators 3 across the entire die head. The selectivity and interchangeability of the adjusting blocks and plug rods 2 within the through-hole enables flexible configuration of the adjusting block distribution density, allowing users to dynamically set different adjustment densities in different sections of the die head according to actual coating requirements. This allows the die head to operate with lower overall cost and higher structural strength, while also specifically meeting the high-precision adjustment needs of local areas. Furthermore, in sections where high-precision adjustment is not required, the through holes can be sealed using the plug rod 2. Compared to installing all adjustment blocks, the presence of the plug rod 2 provides more solid support structure, effectively enhancing the overall rigidity and strength of the first die head assembly. This allows the first die head assembly to maintain good structural integrity even with multiple through holes inside, significantly reducing the risk of deformation caused by structural weakness, enhancing the structural reliability and stability of the die head, and thus avoiding coating quality degradation and material leakage problems caused by deformation. Simultaneously, because the distribution density of the adjustment blocks is adjustable, the same die head hardware can adapt to various coating processes with different precision requirements by configuring the adjustment blocks and plug rod 2 in different quantities and positions, greatly improving the application flexibility and versatility of the die head.

[0031] It should be noted that the distribution density of the adjustment blocks refers to the number of adjustment blocks used for actively adjusting the gap per unit length of the die head. The length direction of the first coating gap is the width direction of the substrate, and the width of the first coating gap corresponds to the coating thickness.

[0032] In this embodiment, the actuator 3 can be a linear motor or a cylinder, but it is not limited to these; it can be used as long as it meets the requirements.

[0033] In the optional technical solution of this embodiment, all through holes are grouped into multiple adjustment units 4 arranged along the length direction of the first coating gap, and there is a gap between adjacent adjustment units 4; each adjustment unit 4 includes at least three through holes.

[0034] In this embodiment, all through holes are grouped to form multiple adjustment units 4 arranged along the length of the first coating gap, with a gap reserved between adjacent adjustment units 4. The adjustment units 4 enable a modular design for the first die assembly, facilitating local configuration changes and precision management. Simultaneously, the spacing ensures the structural strength of the first die assembly, significantly compensating for the structural strength loss caused by the through holes.

[0035] In the optional technical solution of this embodiment, the adjustment unit 4 includes three through holes; the adjustment block includes a first adjustment block 5 and a second adjustment block 6, and along the length direction of the first coating gap, the length of the adjustment part of one first adjustment block 5 is equal to the sum of the lengths of the adjustment parts of the two second adjustment blocks 6; wherein, the adjustment unit 4 can be in a first configuration state or a second configuration state: In the first configuration state, one first adjustment block 5 is disposed in the middle through hole, and two plug rods 2 are respectively disposed in the two outer through holes. In this state, the adjustment unit 4 has only one first adjustment block 5, i.e., one adjustment point, which is suitable for conventional or low-requirement coating sections, saving the actuator 3. In the second configuration state, two second adjustment blocks 6 are respectively disposed in the two outer through holes, and one plug rod 2 is disposed in the middle through hole. In this state, the adjustment unit 4 has two first adjustment blocks 5, i.e., two adjustment points, which doubles the adjustment accuracy and is suitable for local sections that require key monitoring and fine-tuning. It should be noted that in this embodiment, the length of the adjustment part of one first adjustment block 5 is equal to the sum of the lengths of the adjustment parts of two second adjustment blocks 6. The lengths of the adjustment parts of the two second adjustment blocks 6 can be equal or unequal, but are preferably equal, which has strong versatility.

[0036] This embodiment provides a low-cost and simple precision upgrade solution. Users can switch the adjustment range corresponding to the adjustment unit 4 from one adjustment point to two adjustment points by simply configuring and replacing specific problematic units based on the actual detected coating quality. This achieves precise and localized precision improvement without replacing the entire die head or adding actuators 3 to the entire line.

[0037] In the optional technical solution of this embodiment, the adjustment unit 4 includes five through holes; the adjustment block includes a first adjustment block 5, a second adjustment block 6, and a third adjustment block, and along the length direction of the first coating gap, the adjustment part length of one first adjustment block 5 is equal to the sum of the adjustment part lengths of two second adjustment blocks 6, and the adjustment part length of one first adjustment block 5 is equal to the sum of the adjustment part lengths of three third adjustment blocks; wherein, the adjustment unit 4 can be in a first configuration state, a second configuration state, or a third configuration state: in the first configuration state, one first adjustment block 5 is set in the middle through hole, and four plug rods 2 are respectively set in the remaining through holes, resulting in the lowest adjustment density and the best cost; in the second configuration state, two second adjustment blocks 6 are respectively set in the two through holes located on the second outermost side, and three plug rods 2 are respectively set in the middle through hole and the two outermost through holes, resulting in a medium adjustment density and accuracy; in the third configuration state, three third adjustment blocks are respectively set in the middle through hole and the two outermost through holes, and two plug rods 2 are respectively set in the two through holes located on the second outermost side, achieving the highest adjustment density and accuracy in this adjustment unit 4. It should be noted that in this embodiment, the length of the adjusting part of one first adjusting block 5 is equal to the sum of the lengths of the adjusting parts of two second adjusting blocks 6. The lengths of the adjusting parts of the two second adjusting blocks 6 can be equal or unequal, but are preferably equal, which is highly versatile. In the embodiment, the length of the adjusting part of one first adjusting block 5 is equal to the sum of the lengths of the adjusting parts of three third adjusting blocks. The lengths of the adjusting parts of the three third adjusting blocks can be all equal, all unequal, or partially equal, but are preferably all equal, which is highly versatile.

[0038] It should be noted that this embodiment is not limited to the adjustment unit 4 including three or five through holes; it can also include seven through holes. In this case, the adjustment block includes a first adjustment block 5, a second adjustment block 6, a third adjustment block, and a fourth adjustment block. Along the length direction of the first coating gap, the length of the adjustment part of one first adjustment block 5 is equal to the sum of the lengths of the adjustment parts of two second adjustment blocks 6, the length of the adjustment part of one first adjustment block 5 is equal to the sum of the lengths of the adjustment parts of three third adjustment blocks, and the length of the adjustment part of one first adjustment block 5 is equal to the sum of the lengths of the adjustment parts of four fourth adjustment blocks. The adjustment unit 4 can be in a first configuration state, a second configuration state, a third configuration state, or a fourth configuration state. The specific configuration method is analogous to the aforementioned method and will not be repeated here. Of course, the number of through holes included in the adjustment unit 4 can also be analogous to the above method, and the adjustment blocks and configuration states can be analogous accordingly, which will not be repeated here.

[0039] This embodiment provides more refined precision gradient control, allowing users to allocate resources more flexibly according to the extreme requirements of coating precision in different sections, thereby achieving an optimal and customized balance between cost, strength, and precision.

[0040] In the optional technical solution of this embodiment, a sealing element is provided between the connecting part of the adjusting block and the inner wall of the through hole; and / or, a sealing element is provided between the plug rod 2 and the inner wall of the through hole.

[0041] In this embodiment, a sealing element is provided between the connecting part of the adjusting block and the inner wall of the through hole, ensuring the sealing of the first die assembly and preventing the coating slurry from leaking out of the through hole gap under pressure. The sealing element can be a sealing ring 12 or sealant, but is not limited to these; other sealing elements that meet the requirements can also be used.

[0042] In this preferred embodiment, the sealing element is a sealing ring 12, and multiple sealing rings 12 are provided to improve the sealing performance.

[0043] In the optional technical solution of this embodiment, the adjustment component 1 further includes a plug 7 for fixing the plug rod 2. By fixing the plug rod 2 inserted into the through hole from the outside of the die head through the plug 7, the positional stability of the plug rod 2 under long-term slurry pressure and working vibration inside the die head is ensured, preventing it from loosening or shifting, thereby ensuring the reliability of the configuration state of the adjustment unit 4.

[0044] In the optional technical solution of this embodiment, the second die head assembly is further provided with a push-pull rod adjustment assembly 8, which is used to coarsely adjust the first coating gap. This achieves coordinated coarse and fine adjustment; the push-pull rod adjustment assembly 8 can perform rapid, large-range coarse adjustments across the entire first coating gap, while individual adjustment blocks can then perform local fine adjustments. This composite adjustment method greatly expands the process adaptability range of the die head and improves debugging efficiency.

[0045] In the optional technical solution of this embodiment, the first mold head assembly includes an upper mold 9 and a middle mold 10, and the second mold head assembly includes a lower mold 11; the middle mold 10 and the lower mold 11 are disposed opposite to each other, and a first coating gap is formed between the middle mold 10 and the lower mold 11. Along the length direction of the first coating gap, a plurality of through holes are provided on the middle mold 10; the upper mold 9 and the middle mold 10 are disposed opposite to each other, and a second coating gap is formed between the upper mold 9 and the middle mold 10.

[0046] The adjustment mechanism provided in this embodiment is applicable not only to single-layer coating dies but also to double-layer coating dies. The upper die 9 is provided with an upper feed port 13, and the lower die 11 is provided with a lower feed port 14.

[0047] In this embodiment, multiple through holes can also be opened in the upper mold 9. The adjustment component 1 is set in the upper mold 9. By changing the number and position of the adjustment blocks and the plug rods 2 set in the through holes of the upper mold 9, the distribution density of the adjustment blocks of the second coating gap can be adjusted.

[0048] In the optional technical solution of this embodiment, the angle between the upper lip surface and the lower lip surface of the middle mold 10 is 35°-55°.

[0049] In this embodiment, the included angle between the upper and lower lip surfaces of the middle mold 10 is in the range of 35° to 55°, that is, the included angle of the middle mold 10 is in the range of 35° to 55°, preferably 45°.

[0050] The die head provided in this embodiment is an intermittent double-layer die head. The conventional intermittent double-layer die head has an upper die 9 angle of 90°, a middle die 10 angle of 30°, and a lower die 11 angle of 60°. In this embodiment, the angle of the middle die 10 is adjusted to 45°, but not limited to 45°. Compared with the traditional 30° angle design, increasing the angle of the middle die 10 directly results in a significant increase in the thickness of the middle die 10 in the vertical direction, which greatly enhances the structural rigidity of the middle die 10. Even after multiple sets of through holes are opened, it can still maintain sufficient strength and effectively prevent the deformation of the middle die 10.

[0051] The coating equipment provided in this embodiment includes the aforementioned adjustable coating gap die head. Therefore, the technical advantages and effects achieved by the coating equipment include those achieved by the aforementioned adjustable coating gap die head, which will not be elaborated here.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A die head with adjustable coating gap, characterized in that, include: First mold head assembly, second mold head assembly and adjustment assembly (1); The first die head assembly and the second die head assembly are disposed opposite to each other, and a first coating gap is formed between the first die head assembly and the second die head assembly; Along the length of the first coating gap, the first die assembly is provided with a plurality of through holes; The adjustment component (1) includes an adjustment block, a plug rod (2) and an actuator (3). The adjustment block and the plug rod (2) are selectively disposed in each of the through holes, and the adjustment block and the plug rod (2) are interchangeable. The adjustment block is used to adjust the width of the first coating gap. By changing the number and position of the adjustment block and the plug rod (2) disposed in the through hole, the distribution density of the adjustment block in the first coating gap can be adjusted. The actuator (3) is connected to the adjustment block and is used to drive the adjustment block to move so as to adjust the width of the first coating gap corresponding to the adjustment block.

2. The adjustable coating gap die head according to claim 1, characterized in that, All the through holes are grouped into multiple adjustment units (4) arranged along the length direction of the first coating gap, and there is a gap between adjacent adjustment units (4); Each of the adjustment units (4) includes at least three of the through holes.

3. The adjustable coating gap die head according to claim 2, characterized in that, The adjustment unit (4) includes three through holes; The adjustment block includes a first adjustment block (5) and a second adjustment block (6), and along the length direction of the first coating gap, the length of the adjustment part of one first adjustment block (5) is equal to the sum of the lengths of the adjustment parts of two second adjustment blocks (6); The adjustment unit (4) can be in either a first configuration state or a second configuration state: In the first configuration state, one of the first adjustment blocks (5) is disposed in the through hole located in the middle, and two of the plug rods (2) are respectively disposed in the two through holes located on the outer sides; In the second configuration state, the two second adjustment blocks (6) are respectively disposed in the two through holes located on the outside, and the one plug rod (2) is disposed in the through hole located in the middle.

4. The adjustable coating gap die head according to claim 2, characterized in that, The adjustment unit (4) includes five through holes; The adjustment block includes a first adjustment block (5), a second adjustment block (6) and a third adjustment block. Along the length direction of the first coating gap, the length of the adjustment part of one first adjustment block (5) is equal to the sum of the lengths of the adjustment parts of two second adjustment blocks (6), and the length of the adjustment part of one first adjustment block (5) is equal to the sum of the lengths of the adjustment parts of three third adjustment blocks. The adjustment unit (4) can be in a first configuration state, a second configuration state, or a third configuration state: In the first configuration state, one of the first adjustment blocks (5) is disposed in the through hole located in the middle, and four of the plug rods (2) are disposed in the remaining through holes respectively; In the second configuration state, the two second adjustment blocks (6) are respectively disposed in the two through holes located on the second outer side, and the three plug rods (2) are respectively disposed in the through hole located in the middle and the two through holes located on the outermost side; In the third configuration state, the three third adjustment blocks are respectively disposed in the middle through hole and the two outermost through holes, and the two plug rods (2) are respectively disposed in the two secondary outermost through holes.

5. The adjustable coating gap die head according to claim 1, characterized in that, A sealing element is provided between the connecting part of the adjusting block and the inner wall of the through hole; and / or; A sealing element is provided between the plug rod (2) and the inner wall of the through hole.

6. The adjustable coating gap die head according to claim 1, characterized in that, The adjustment assembly (1) also includes a plug (7) for fixing the plug rod (2).

7. The adjustable coating gap die head according to claim 1, characterized in that, The second die head assembly is also provided with a push-pull rod adjustment assembly (8), which is used to coarsely adjust the first coating gap.

8. The adjustable coating gap die head according to any one of claims 1-7, characterized in that, The first mold head assembly includes an upper mold (9) and a middle mold (10), and the second mold head assembly includes a lower mold (11). The middle mold (10) is disposed opposite to the lower mold (11), and the first coating gap is formed between the middle mold (10) and the lower mold (11). Along the length direction of the first coating gap, the middle mold (10) is provided with a plurality of through holes. The upper mold (9) is disposed opposite to the middle mold (10), and a second coating gap is formed between the upper mold (9) and the middle mold (10).

9. The adjustable coating gap die head according to claim 8, characterized in that, The angle between the upper lip surface and the lower lip surface of the middle mold (10) is 35°-55°.

10. A coating apparatus, characterized in that, The die head includes the adjustable coating gap as described in any one of claims 1-9.

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