CN219965415U - Coating die head and coating equipment - Google Patents

Abstract

The utility model provides a coating die head and coating equipment, comprising: the die head main body is provided with an upper die and a lower die, and the lower die is provided with a main runner and a branch runner; the adjusting mechanism is provided with a driving piece and a moving piece, the moving piece is arranged in the branch flow channel and forms an annular gap for the slurry to pass through with the branch flow channel, and the driving piece is arranged on the upper die and can drive the moving piece to act relative to the branch flow channel so as to adjust the flow of the slurry passing through the annular gap. The movable piece is provided with the branch flow channel, and the movable piece is provided with the branch flow channel; and the slurry flow passage and the regulating mechanism are respectively positioned on the upper die and the lower die, which is beneficial to the assembly and the processing of equipment.

Description

Coating die head and coating equipment

Technical Field

The utility model relates to the technical field of extrusion coating, in particular to a coating die head and coating equipment.

Background

Currently, extrusion coating technology in the market is a main technical means for coating lithium battery pole pieces. However, because the design of the extrusion coating die head has close relation with the flow property of the lithium battery slurry, the design technology is complex, time and labor are consumed, and because of the different properties of the battery slurry in different batches, the slurry and the coating die head are not matched, and the adjustment capability of the die head is exceeded.

In order to make the thickness of the slurry discharged from the lip of the die head consistent, the current extrusion coating die head is provided with an adjusting mechanism at a position close to the lip, so as to make the thickness of the slurry discharged from the lip consistent. The existing adjusting mode is generally that the side wall of the slurry flow channel stretches into the intercepting block, the sectional area of the slurry flow channel is changed through the intercepting block, but the adjusting range of the slurry flow channel is limited, and the intercepting block and the slurry flow channel are required to be matched in size (if gaps formed by poor size matching can affect coating quality), so that the requirement on the manufacturing precision of parts is high, and the problems of high processing difficulty and high processing cost exist.

Disclosure of Invention

In view of the above, the present utility model provides a coating die and a coating apparatus capable of reducing processing difficulty and processing cost.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

a coating die, comprising:

the die head main body is provided with an upper die and a lower die, and the lower die is provided with a main runner and a branch runner;

the adjusting mechanism is provided with a driving piece and a moving piece, the moving piece is arranged in the branch flow channel and forms an annular gap for the slurry to pass through with the branch flow channel, and the driving piece is arranged on the upper die and can drive the moving piece to act relative to the branch flow channel so as to adjust the flow of the slurry passing through the annular gap.

Optionally, the movable member adjusts the length and/or cross-sectional area of the annular gap by acting relative to the branch flow channel to adjust the flow rate of the slurry passing through the annular gap.

Optionally, one end of the branch runner is communicated with the main runner, the other end of the branch runner is located on the end face of the lower die, which is close to the upper die, and the movable piece can extend out of and into the branch runner so as to adjust the length of the annular gap.

Optionally, the adjusting mechanism includes:

the sliding piece is connected with the movable piece, is positioned at one side of the branch runner far away from the main runner, penetrates through the upper die and is sealed with the upper die in a sliding way;

the driving piece is arranged outside the upper die and connected with the sliding piece, and can drive the sliding piece to move relative to the upper die so as to enable the movable piece to move relative to the branch runner.

Optionally, the upper die is provided with a sliding hole, the sliding piece is slidably disposed in the sliding hole, and a limiting structure is disposed between the sliding piece and the sliding hole, so as to limit a sliding range of the sliding piece relative to the sliding hole.

Optionally, the lower die is provided with a plurality of homogenizing grooves near the terminal surface of last mould, a plurality of homogenizing grooves with a plurality of the exit end of tributary way one-to-one intercommunication.

Optionally, a diversion trench is communicated with one side of the uniform flow groove near the lip of the die head main body, and the diversion trench extends towards the lip and diverges in the extending direction.

Optionally, the diversion trench extends towards the lip and gradually decreases in depth.

Optionally, the die head main part is including being located go up the mould with the gasket between the lower mould, be provided with a plurality of grooves of dodging on the gasket, the notch in a plurality of even grooves is located a pair of the inslot of dodging, just dodge the notch in groove orientation the lip of die head main part.

Optionally, when the flow rate of the slurry in the branch flow channel is adjusted by adjusting the length of the annular slit, the cross-sectional areas of the positions of the annular slit are uniform in the length direction of the annular slit.

Optionally, the cross sections of the movable piece and the branch runner are all round, so that the cross section of the annular slit is a circular ring.

Optionally, the outer wall of the movable piece and/or the inner wall of the branch flow channel are provided with throttling grooves, and the throttling grooves extend along the length direction of the annular gap.

A coating apparatus comprising a coating die as claimed in any one of the preceding claims.

According to the coating die head and the coating equipment, the annular seam is formed between the movable piece and the branch runner and is positioned at the inner side of the branch runner and at the outer side of the movable piece, the annular seam is formed without strict matching of the movable piece and the branch runner, and the annular seam can be formed only by the movable piece with the size smaller than that of the branch runner. And the slurry runner (main runner, branch runner) is arranged on the lower die, the regulating mechanism (driving piece) is arranged on the upper die, and the two parts are respectively arranged on the upper die and the lower die, so that the assembly of parts is facilitated, the processing die opening of the upper die and the lower die is facilitated, and the cost is saved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a coating die shown in a first embodiment;

fig. 2 is a cross-sectional view of a coating die shown in the first embodiment;

FIG. 3 is a top view of the lower die shown in the first embodiment;

fig. 4 is a cross-sectional view of the lower die shown in the first embodiment;

fig. 5 is a second cross-sectional view of the lower die shown in the first embodiment.

In the figure: 1. an upper die; 2. a lower die; 3. a gasket; 4. a feed channel; 5. a driving member; 6. a slider; 7. a movable member; 11. a main flow passage; 12. a branch flow passage; 13. a flow homogenizing groove; 14. a diversion trench; 15. a lip; 31. avoiding the groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1-5, an embodiment of the present utility model provides a coating die comprising a die body and an adjustment mechanism.

The main body of the die head is provided with a main runner 11 and a branch runner 12, the main runner 11 is communicated with the feeding channel 4, and the branch runner 12 is communicated with the main runner 11, so that the slurry is dispersed into the branch runner 12. Specifically, the module main body comprises an upper die 1, a lower die 2 and a gasket 3, wherein the upper die 1 and the lower die 2 are in matched connection, the gasket 3 is arranged between the upper die 1 and the lower die 2, and a discharge slit is formed between the upper die 1, the lower die 2 and the gasket 3, one side of the discharge slit is communicated with a branch runner 12, and a lip 15 is formed on the other side of the discharge slit, so that slurry dispersed through the branch runner 12 flows through the discharge slit and finally flows out from the lip 15, and coating work is completed. In addition, the main runner 11 and the branch runner 12 are disposed in the lower die 2 so that the slurry flows into the main runner 11 through the feed channel 4, and flows out from the branch runner 12 of the main runner 11 through the discharge slit and out from the lip 15, so that the formed slurry runners (the main runner 11, the branch runner 12 and the discharge slit) do not pass through the upper die 1, thereby being beneficial to sealing the slurry runners.

The adjustment mechanism includes driving piece 5 and moving part 7, moving part 7 sets up in branch flow channel 12, and form the annular seam between moving part 7 and the branch flow channel 12, this annular seam is located the inboard of branch flow channel 12 and is located the outside of moving part 7, the formation of this annular seam need not the tight cooperation of moving part 7 and branch flow channel 12, only need the size of moving part 7 be less than the size of branch flow channel 12 can form the annular seam, for example, the external diameter of moving part 7 is less than the internal diameter of branch flow channel 12, through the design of annular seam, greatly reduced the processing degree of difficulty and the processing cost of equipment, be favorable to promoting machining efficiency.

The driving piece 5 is arranged on the upper die 1 and is connected with the movable piece 7, so that the driving piece 5 can drive the movable piece 7 to act relative to the branch flow passage 12 to finish adjusting the flow of the slurry passing through the annular seam (the branch flow passage 12), and when the device is used, the driving piece 5 can adjust the flow of the slurry passing through the annular seam by adjusting the action of the movable piece 7 relative to the branch flow passage 12, so that the device is convenient to operate and beneficial to realizing automatic adjustment, and particularly, the driving piece 5 is arranged on the outer side of the upper die 1. Like this, through setting up slurry runner (sprue 11, branch runner 12) at lower mould 2, set up adjustment mechanism (driving piece 5) at last mould 1, two parts set up respectively at last mould 1 and lower mould 2, are favorable to the assembly of spare part, are convenient for realize the processing die sinking of last mould 1 and lower mould 2, can utilize current slurry runner structure moreover, only to last mould 1 processing preparation, processing is simple, labour saving and time saving is favorable to practicing thrift the cost.

Specifically, by the action of the movable member 7 with respect to the branch flow passage 12, the length and/or the sectional area of the annular slit can be changed, since the sectional area of the annular slit with respect to the entire branch flow passage 12 is small, so that the annular slit has a throttling effect in the branch flow passage 12, by increasing the length of the annular slit or decreasing the sectional area of the annular slit, the throttling effect of the annular slit can be improved, by decreasing the length of the annular slit or increasing the sectional area of the annular slit, the throttling effect of the annular slit can be reduced, and further by controlling these two parameters (length and sectional area) of the annular slit, the throttling effect of the annular slit can be controlled, so as to control the flow rate of the slurry passing through the annular slit (branch flow passage 12). Therefore, the design requirements on the movable piece 7 and the branch runner 12 are low, the movable piece 7 only needs to act relative to the branch runner 12, the length or the sectional area of the annular gap can be adjusted, the cost is saved, the operation is convenient, and the time and the labor are saved.

It should be noted that, the multiple branch runners 12 are provided with multiple branch runners 12 and all are communicated with the main runner 11 to realize the diversion effect of the branch runners 12, correspondingly, the adjusting mechanism is also provided with multiple branch runners 12 and corresponds to the multiple branch runners 12 one by one, so that the multiple movable blocks are arranged in the multiple branch runners 12 one by one, and the slurry flow in the multiple branch runners 12 can be adjusted respectively through the multiple adjusting mechanisms, so that the specific branch runners 12 can be adjusted according to specific conditions, and the consistency of the discharge thickness and the coating thickness of the lip 15 can be improved.

The arrangement of the device forms an annular gap between the movable piece 7 and the branch runner 12, so that the branch runner 12 can be throttled through the annular gap, the processing difficulty and the processing cost of the device can be reduced, and the processing efficiency can be improved; and in addition, the slurry flow passage and the regulating mechanism are respectively positioned on the upper die 1 and the lower die 2, which is beneficial to the assembly and the processing of equipment.

In this scheme, branch runner 12 one end and sprue 11 intercommunication, the other end is located the terminal surface that lower mould 2 is close to mould 1 to make branch runner 12 have the opening towards mould 1, because driving piece 5 sets up at last mould 1 and is connected with movable part 7, through the design of branch runner 12, be favorable to making the movable part 7 that is connected with driving piece 5 stretch into and stretch out branch runner 12, that is, movable part 7 stretches into and stretches out branch runner 12 by the one end that keeps away from branch runner 12, in order to adjust the length of annular seam. The moving part 7 is arranged in the branch runner 12 and can extend into and extend out of the branch runner 12, when the moving part 7 extends into the branch runner 12, the length of an annular gap formed between the moving part 7 and the branch runner 12 is increased, when the moving part 7 extends out of the branch runner 12, the length of an annular gap formed between the moving part 7 and the branch runner 12 is reduced, and then the length of the annular gap is adjusted by extending into and extending out of the moving part 7 so as to adjust the throttling effect formed by the annular gap. Like this, the control mode to moving part 7 is simple, is convenient for control, is favorable to promoting adjustment mechanism's regulation precision.

The adjusting mechanism comprises a movable part 7, a sliding part 6 and a driving part 5, wherein the sliding part 6 is arranged in the upper die 1 in a penetrating way and is in sliding sealing with the upper die 1 so that the sliding part 6 can slide relative to the upper die 1, a gap between the sliding part 6 and the upper die 1 is sealed, specifically, the upper die 1 is provided with a sliding hole, the sliding part 6 is arranged in the sliding hole and is in sliding fit with the sliding hole, and a sealing structure (such as a sealing ring) is arranged between the sliding part 6 and the sliding hole so as to form a seal between the sliding part 6 and the sliding hole. The sliding piece 6 is connected with the movable piece 7, and the sliding piece 6 is located on one side of the branch flow channel 12 away from the main flow channel 11, namely, the sliding hole is located on one side of the branch flow channel 12 away from the main flow channel 11, so that when the sliding piece 6 drives the movable piece 7 to extend into and out of the branch flow channel 12, the sliding piece 6 cannot influence the flow of slurry in the branch flow channel 12 and the main flow channel 11, and a good avoiding effect is achieved. The driving piece 5 is arranged outside the upper die 1 and is connected with the sliding piece 6, so that the driving piece 5 is indirectly connected with the movable piece 7 through the sliding piece 6, the driving piece 5 can indirectly drive the movable piece 7 to displace relative to the branch runner 12 by driving the sliding piece 6 to displace relative to the upper die 1, and therefore, the driving piece 5 and the movable piece 7 are connected through the sliding piece 6, and the driving piece 5 is convenient to adjust the movable piece 7 and convenient to operate. Specifically, the driving member 5 is provided as a differential head.

It should be noted that, the connection between the sliding member 6 and the movable member 7 may be welded or integrally formed, that is, the sliding member 6 and the movable member 7 form a structural member, and the sliding member 6 and the movable member 7 respectively correspond to different portions of the structural member.

Wherein, go up mould 1 and be provided with the slide hole, slider 6 sets up in the slide hole to with slide hole sliding fit, set up limit structure between slider 6 and the slide hole, can restrict slider 6 for the slip scope of slide hole through limit structure, and then restrict movable part 7 for the slip scope of branch runner 12, in order to avoid movable part 7 to stretch into or excessively stretch into branch runner 12, and avoid movable part 7 to stretch out excessively or stretch out completely in by branch runner 12, the annular seam that forms between assurance branch runner 12 and the movable part 7 has reliable and stable throttling action.

Specifically, limit structure is including setting up the spacing arch at slider 6 outer wall and setting up the spacing recess at the sliding hole inner wall, and the extending direction of spacing recess is unanimous with the extending direction of sliding hole, and spacing arch slides in spacing recess, and when spacing arch was located the tip of spacing recess, limit structure played spacing effect.

In some embodiments, the end surface of the lower die 2 near the upper die 1 is provided with a flow homogenizing groove 13, and the flow homogenizing groove 13 is matched with the upper die 1 and the gasket 3 and forms a cavity for homogenizing flow between the upper die 1 and the lower die 2. The flow homogenizing groove 13 is located at an outlet end of the branch flow channel 12 (the inlet end of the corresponding branch flow channel 12 is communicated with the main flow channel 11) and is communicated with the branch flow channel 12, specifically, one side of the discharge slit is communicated with the branch flow channel 12 through the flow homogenizing groove 13, and the other side forms a lip 15. Thus, the slurry flowing out of the branch flow channel 12 can be homogenized through the homogenizing groove 13, so that the slurry pressure in the homogenizing groove 13 is equal, and the uniformity of the thickness of the slurry flowing out of the lip 15 is better.

It should be noted that, the annular slits are formed in each branch flow channel 12, so that each annular slit is independently separated in different branch flow channels 12, interference to throttling effect between adjacent branch flow channels 12 is small, slurry is converged to the uniform flow groove 13 after passing through the annular slits, and further uniform flow is performed through the uniform flow groove 13, so that a better uniform flow effect is achieved. Moreover, due to the throttling effect of the annular slot, the uniformity of the pressure of the slurry before entering the flow homogenizing groove 13 is good, and the flow homogenizing groove 13 is designed to realize the uniformity of the pressure of the slurry at the boundary position of the adjacent branch flow passages 12, so that the design is very small, the flow speed of the slurry in the flow homogenizing groove 13 is relatively high, and the slurry is not easy to deposit.

The flow homogenizing grooves 13 are provided with a plurality of flow homogenizing grooves 13, the flow homogenizing grooves 13 are communicated with the outlet ends of the branch flow channels 12 one by one, and when the flow homogenizing device works, the slurry flows into the flow homogenizing grooves 13 from the branch flow channels 12 and is converged in the flow homogenizing grooves 13, so that the influence on coating caused by pressure mutation in the branch flow channels 12 can be prevented, and the slurry flows out from the flow homogenizing grooves 13, so that the slurry in the adjacent flow homogenizing grooves 13 is converged in the discharge slits and flows uniformly, and the uniformity of the coating thickness is further ensured.

Further, a diversion trench 14 is disposed at one side of the flow homogenizing trench 13 near the lip 15, the diversion trench 14 is communicated with the flow homogenizing trench 13, so that the slurry in the flow homogenizing trench 13 flows into the diversion trench 14, the diversion trench 14 extends towards the lip 15 and diverges in the extending direction, so that the diversion trench 14 forms an outer eight flaring shape, so that the slurry in the diversion trench 14 gradually diffuses along the diversion trench 14 and converges in the discharge slit, and finally flows out from the lip 15. Like this, the structural design of guiding gutter 14 can make thick liquids diffuse gradually in guiding gutter 14 along being close to the direction of lip 15 in until gathering at lip 15, because guiding gutter 14 is towards and is close to lip 15, when the coating thickness of corresponding position is adjusted to needs, adjustment mechanism's regulation effect is more timely and accurate, is favorable to promoting adjustment mechanism's feedback efficiency.

The width of the diversion trench 14 is consistent with the direction of the coating width (i.e. the arrangement direction of the plurality of branch runners 12), the depth of the diversion trench 14 is consistent with the direction of the coating thickness (i.e. the thickness direction of the lip 15 is also equivalent to the direction from the upper die 1 to the lower die 2), and the diversion trench 14 is gradually expanded in the extending direction in the above scheme, so that at least the width of the diversion trench 14 is gradually expanded in the extending direction, and the slurry is diffused to the lip 15. The depth of the diversion trench 14 is gradually reduced in the extending direction of the diversion trench 14 (in the direction from the uniform flow trench 13 to the lip 15), so that the depth of the diversion trench 14 is gradually reduced in the process of approaching the lip 15, and thus, the slurry in the uniform flow trench 13 can be smoothly and efficiently guided into the discharge slit through the diversion trench 14, and no accumulation is formed in the diversion trench 14, so that the discharge stability is ensured. Specifically, the groove bottom of the diversion trench 14 is provided as a slope or a curved surface so that the depth of the diversion trench 14 gradually decreases in the extending direction.

The die head main part is including being located the gasket 3 between upper mould 1 and the lower mould 2, be provided with on the gasket 3 and dodge the groove 31, and dodge the notch in groove 31 and be located dodge the lip 15 of groove 31 towards the die head main part, like this, dodge the design in groove 31 on the gasket 3, make dodge the groove 31 and form the direction spacing to the thick liquids in the groove 13 that dodges, both avoid the thick liquids to leak between upper mould 1 and the lower mould 2, can lead the thick liquids to lip 15 again, further promoted the guidance quality and the leakproofness of the groove 13 that dodges.

Specifically, the uniform flow groove 13 is provided with a plurality of, the guiding groove 14 is provided with a plurality of, the avoidance groove 31 is also provided with a plurality of, a plurality of avoidance grooves 31 are in one-to-one correspondence with a plurality of uniform flow grooves 13, a plurality of avoidance grooves 31 are in one-to-one correspondence with a plurality of avoidance grooves 31, the uniform flow groove 13 and the guiding groove 14 are positioned in the avoidance grooves 31, under the effect of the avoidance grooves 31, the sealing of the uniform flow groove 13 and the guiding groove 14 is realized through the upper die 1 and the gasket 3, and slurry in the uniform flow groove 13 and the guiding groove 14 is guided.

Of course, in other schemes, dodge the groove 31 and be provided with a plurality ofly, through making the exit end of branch flow channel 12 be located dodge inslot 31 to form the even chute 13 between last mould 1, lower mould 2 and dodge inslot 31, so, need not to carry out fluting to last mould 1 and lower mould 2, the processing of being convenient for, labour saving and time saving.

In this embodiment, in the length direction of the annular slit (i.e., the extending directions of the movable member 7 and the branch flow passage 12), the cross sectional areas of the respective positions on the annular slit are uniform, specifically, the branch flow passage 12 has a cylindrical portion with uniform cross section, the movable member 7 is located in the cylindrical portion, and the movable member 7 has a columnar structure with uniform radial cross section, and the annular slit with uniform cross sectional area is formed by the columnar structure being matched (e.g., coaxially arranged) with the cylindrical portion. Like this, when adjusting the throttle effect of annular seam, can only change the length of annular seam, easy and simple to handle, the change curve of the throttle effect of annular seam is comparatively mild (the throttle effect of annular seam is directly proportional with the length of annular seam) moreover when adjusting, can not take place the mutation, is favorable to carrying out accurate control to the throttle effect of annular seam, and then promotes adjustment mechanism's accuracy and precision.

The cross section of moving part sets up to circularly, and the cross section of branch flow way also sets up to circularly to the cross section of the annular seam that forms between messenger's moving part and the branch flow way is the ring, like this, and annular seam is favorable to the thick liquids circulation, can avoid thick liquids to block up in annular seam effectively, promotes smooth and easy nature and the stability that the thick liquids circulate, and, the cross section is circular moving part, and the processing preparation of being convenient for is favorable to reducing processing cost and processing degree of difficulty, further improves machining efficiency.

Here, the movable element 7 may have a uniform cross-sectional area such as a cylinder, or may have a different cross-sectional area such as a cone or a truncated cone.

A throttling groove is provided between the movable member 7 and the branch flow passage 12, specifically, the throttling groove is provided on the outer wall of the movable member 7 or the inner wall of the branch flow passage 12 so that the throttling groove communicates with the annular slit. The throttling groove extends along the length direction of the annular seam, so that the sectional area of the annular seam can be increased through the design of the throttling groove, and the throttling groove can be adaptively adjusted according to different throttling effects to form adjustable ranges of different throttling effects, so that the throttling groove is suitable for various coating dies.

The throttle groove may be a constant-size groove or a variable-size groove (e.g., a triangular groove). When the throttling groove is a groove with gradually changed size, the length of the annular seam can be changed during adjustment, the sectional area of the annular seam can be changed, and the adjustment range is improved.

An embodiment of the present utility model provides a coating apparatus including a coating die, which is the coating die in the above embodiment. So set up, form the annular seam between moving part 7 and branch runner 12, both can throttle branch runner 12 through the annular seam, can reduce the processing degree of difficulty and the processing cost of equipment again, be favorable to promoting machining efficiency.

In addition, please refer to the description of the coating die for other beneficial effects of the coating apparatus, and the description is omitted herein.

The basic principles of the present utility model have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present utility model are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present utility model. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the utility model is not necessarily limited to practice with the above described specific details.

The block diagrams of the devices, apparatuses, devices, systems referred to in the present utility model are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present utility model, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present utility model.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the utility model. Thus, the present utility model is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It should be understood that the terms "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present utility model are used for more clearly describing the technical solutions, and are not intended to limit the scope of the present utility model.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the utility model to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims (13)

1. A coating die, comprising:

the die head main body is provided with an upper die and a lower die, and the lower die is provided with a main runner and a branch runner;

the adjusting mechanism is provided with a driving piece and a moving piece, the moving piece is arranged in the branch flow channel and forms an annular gap for the slurry to pass through with the branch flow channel, and the driving piece is arranged on the upper die and can drive the moving piece to act relative to the branch flow channel so as to adjust the flow of the slurry passing through the annular gap.

2. The coating die of claim 1, wherein the movable member adjusts the length and/or cross-sectional area of the annular slot by acting relative to the side flow channel to adjust the flow rate of the slurry through the annular slot.

3. The coating die of claim 1, wherein the branch flow passage has one end communicating with the main flow passage and the other end located at an end face of the lower die close to the upper die, and the movable member is capable of extending out of and into the branch flow passage to adjust a length of the annular slit.

4. A coating die as in claim 3 wherein the adjustment mechanism comprises:

the sliding piece is connected with the movable piece, is positioned at one side of the branch runner far away from the main runner, penetrates through the upper die and is sealed with the upper die in a sliding way;

the driving piece is arranged outside the upper die and connected with the sliding piece, and can drive the sliding piece to move relative to the upper die so as to enable the movable piece to move relative to the branch runner.

5. The coating die of claim 4, wherein the upper die is provided with a slide hole in which the slide member is slidably disposed, and a limit structure is provided between the slide member and the slide hole to limit a sliding range of the slide member with respect to the slide hole.

6. The coating die according to claim 1, wherein the lower die is provided with a plurality of flow-homogenizing grooves near the end face of the upper die, the plurality of flow-homogenizing grooves being in one-to-one communication with the outlet ends of the plurality of branch flow channels.

7. The coating die of claim 6, wherein the flow homogenizing groove is communicated with a flow guiding groove at one side of the lip of the die body, and the flow guiding groove extends towards the lip and diverges in the extending direction.

8. The coating die of claim 7, wherein the flow channels extend toward the lip and taper in depth.

9. The coating die of claim 6, wherein the die body comprises a gasket positioned between the upper die and the lower die, a plurality of avoidance grooves are arranged on the gasket, the notches of the plurality of homogenization grooves are positioned in the plurality of avoidance grooves one to one, and the notches of the avoidance grooves face the lip of the die body.

10. The coating die according to claim 1, wherein when the flow rate of the slurry in the branch flow passage is adjusted by adjusting the length of the annular slit, the cross-sectional areas of the respective positions of the annular slit are uniform in the length direction of the annular slit.

11. The coating die of claim 1, wherein the cross-sections of the movable member and the branch flow channel are each provided in a circular shape such that the cross-section of the annular slit is a circular ring.

12. Coating die according to claim 1, characterized in that the outer wall of the moving part and/or the inner wall of the branch flow channel is provided with a throttling groove extending in the length direction of the annular slot.

13. A coating apparatus comprising the coating die of any one of claims 1 to 12.