Die head closed-loop adjusting device and coating equipment

Abstract

The utility model discloses a mould head closed-loop adjusting device and coating equipment, the mould head closed-loop adjusting device comprises a mounting rack and a plurality of adjusting mechanisms, the plurality of adjusting mechanisms are respectively arranged on the mounting rack, the plurality of adjusting mechanisms are sequentially arranged along the length direction of the mounting rack, and the plurality of adjusting mechanisms are arranged on the mounting rack. The adjusting mechanism comprises a driving assembly, a transmission assembly, a differential thread assembly and a T-shaped block, the transmission assembly is connected with the tail end of an output shaft of the driving assembly and the top end of the differential thread assembly, the T-shaped block is located below the differential thread assembly, the top end of the T-shaped block is connected with the bottom end of the differential thread assembly, and the T-shaped block is located below the differential thread assembly. The bottom ends of the T-shaped blocks of the multiple adjusting mechanisms make contact in sequence, and the driving assembly is used for driving the T-shaped blocks to move up and down through the transmission assembly and the differential thread assembly. According to the utility model, the consistency of the coating thickness before and after coating can be ensured, so that the coating uniformity is ensured, the adjusting efficiency is improved, and the coating efficiency is improved.

Description

Technical Field

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

[0002] Extrusion coating is one of the main coating methods in the lithium battery industry. In the extrusion coating process, the slurry is transported to the coating slit between the upper die and the lower die of the coating die, and is coated on the substrate to be coated, such as aluminum foil, through the coating lip of the coating die, and then dried in an oven to obtain a coated product. The existing coating die generally includes an upper die, a lower die, and a gasket disposed between the upper die and the lower die. A coating slit is formed between the gasket and the upper die. The height of the gasket determines the height of the coating slit. During the coating process, due to factors such as the slurry temperature or viscosity, the coating thickness of the substrate often appears inconsistent, so it is usually necessary to adjust the coating thickness.

[0003] The coating thickness is usually adjusted manually, specifically by adjusting the height of the gasket to adjust the height of the coating slit, thereby adjusting the amount of material passing through the coating slit, and then adjusting the coating thickness. This manual adjustment method has high requirements for operators and is affected by human factors, resulting in large adjustment errors and the inability to ensure consistency of coating thickness before and after. At the same time, the manual method has low adjustment efficiency, which reduces the coating efficiency. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a die head closed-loop adjustment device and a coating device, which can ensure the consistency of coating thickness before and after, thereby ensuring the uniformity of coating, improving the adjustment efficiency, and improving the coating efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The first aspect of the utility model provides a die head closed-loop adjustment device, comprising a mounting frame and a plurality of adjustment mechanisms, wherein the plurality of adjustment mechanisms are respectively arranged on the mounting frame, and the plurality of adjustment mechanisms are sequentially arranged along the length direction of the mounting frame, and the adjustment mechanism comprises a driving assembly, a transmission assembly, a differential thread assembly and a T-block, wherein the transmission assembly is respectively connected to the end of the output shaft of the driving assembly and the top end of the differential thread assembly, the T-block is located below the differential thread assembly, the top end of the T-block is connected to the bottom end of the differential thread assembly, the bottom ends of the T-blocks of the plurality of adjustment mechanisms are sequentially contacted, and the driving assembly is used to drive the T-block to move up and down through the transmission assembly and the differential thread assembly.

[0007] As a preferred technical solution, the mounting frame includes a main body and two supporting members, and the main body is arranged between the top ends of the two supporting members.

[0008] As a preferred technical solution, the drive assembly includes a drive motor, and the drive motors of adjacent adjustment mechanisms are alternately arranged on both sides of the body. The ends of the output shafts of the drive motors extend into the body and are connected to the transmission assembly.

[0009] As a preferred technical solution, the transmission assembly includes a transmission shaft, a first bevel gear and a second bevel gear. The bottom of the body is provided with a plurality of through holes corresponding to the transmission assemblies of the plurality of adjustment mechanisms. The transmission shaft passes through the corresponding through holes. The first bevel gear is sleeved on the outer periphery of the top end of the transmission shaft. The end of the output shaft of the drive assembly is connected to a connecting shaft. The second bevel gear is sleeved on the outer periphery of the end of the connecting shaft, and the second bevel gear is meshed with the first bevel gear.

[0010] As a preferred technical solution, the differential thread assembly includes an outer shell, an inner shell, a threaded shaft and a movable nut. The top end of the outer shell is arranged at the bottom end of the main body, and the bottom end of the outer shell extends downward. The outer shells of the multiple adjustment mechanisms are arranged in sequence along the length direction of the mounting frame. The bottom end of the transmission shaft extends into the outer shell through the top end of the outer shell. The threaded shaft is arranged in the outer shell. The inner shell is arranged in the outer shell and is sleeved on the outer periphery of the bottom end of the transmission shaft and the outer periphery of the top end of the threaded shaft. The threaded shaft has a first section of thread and a second section of thread. The second section of thread is located below the first section of thread. The pitches of the first section of thread and the second section of thread are different. The movable nut is arranged in the outer shell and the movable nut partially protrudes from the bottom end of the outer shell. The movable nut is sleeved on the outer periphery of the threaded shaft and cooperates with the second section of thread. The bottom end of the movable nut is connected to the top of the T-block.

[0011] As a preferred technical solution, the inner wall of the outer shell is formed with a first limit step and a second limit step, the outer peripheral surface of the transmission shaft is formed with an annular boss, the bottom end and the top end of the inner shell are in contact with the first limit step and the bottom end of the boss respectively, and the second limit step is located below the first limit step and above the movable nut.

[0012] As a preferred technical solution, the T-block includes a vertical portion and a horizontal portion, the top of the vertical portion is connected to the bottom end of the differential thread assembly, the bottom end of the vertical portion is connected to the top of the horizontal portion, and the horizontal portions of the multiple adjustment mechanisms are in contact in sequence.

[0013] As a preferred technical solution, the bottom end of the movable nut is connected to the top end of the T-block through a coupling.

[0014] As a preferred technical solution, the inner wall of the inner shell is provided with a first groove extending along the axial direction of the inner shell, and the outer peripheral surface of the top end of the threaded shaft is provided with a second groove corresponding to the first groove, and a keyway is formed between the first groove and the second groove, and a flat key is provided in the keyway.

[0015] The second aspect of the utility model provides a coating device, including a coating die head, the coating die head includes an upper die head and a lower die head that cooperate with each other, a gasket is arranged between the upper die head and the lower die head, a coating slit is formed between the gasket and the upper die head, the coating slit has a feed inlet and a discharge port, the upper die head and the lower die head are formed with a coating lip at a position corresponding to the discharge port of the coating slit, the coating lip is connected with the discharge port, and also includes a die head closed-loop adjustment device, the die head closed-loop adjustment device includes a mounting frame and a plurality of adjustment mechanisms, the mounting frame is arranged at the top end of the upper die head, the plurality of adjustment mechanisms are respectively arranged on the mounting frame, the plurality of adjustment mechanisms are arranged in sequence along the length direction of the mounting frame, and the adjustment mechanism includes a drive component, a transmission component , a differential thread assembly and a T-block, the transmission assembly is respectively connected to the end of the output shaft of the driving assembly and the top of the differential thread assembly, the T-block is located below the differential thread assembly, the top of the upper die head is provided with a plurality of mounting cavities corresponding to the plurality of adjustment mechanisms, the mounting cavities are vertically arranged with the coating slit and are connected with the coating slit, the bottom ends of the plurality of mounting cavities are sequentially connected, the T-block is arranged in the corresponding mounting cavity, and the top end of the T-block extends from the top end of the corresponding mounting cavity and is connected to the bottom end of the differential thread assembly, the bottom ends of the T-blocks of the plurality of adjustment mechanisms are sequentially in contact with and opposite to the coating slit, and the driving assembly is used to drive the T-block to move up and down through the transmission assembly and the differential thread assembly.

[0016] The beneficial effects of the utility model are as follows: the utility model provides multiple adjustment mechanisms, and the driving assembly drives the T-block to move up and down through the transmission assembly and the differential thread assembly, so as to realize automatic adjustment of the height of the coating slit, thereby realizing automatic adjustment of the amount of material passing through the coating slit, reducing the error caused by manual operation, ensuring the consistency of the coating thickness before and after, thereby ensuring the uniformity of the coating, improving the adjustment efficiency, and improving the coating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a coating device provided by an embodiment of the utility model;

[0019] Figure 2 yes Figure 1A schematic cross-sectional view of a coating die head of the coating device shown;

[0020] Figure 3 yes Figure 1 A schematic diagram of the structure of a die head closed-loop adjustment device of the coating equipment shown;

[0021] Figure 4 yes Figure 1 A schematic top view of a die head closed-loop adjustment device of the coating device shown;

[0022] Figure 5 yes Figure 3 A schematic diagram of the structure of the mounting frame of the die head closed-loop adjustment device shown;

[0023] Figure 6 yes Figure 3 A schematic diagram of the structure of the adjustment mechanism of the die head closed-loop adjustment device;

[0024] Figure 7 yes Figure 6 The schematic cross-sectional view of the adjustment mechanism shown in the figure after removing the drive assembly and the second bevel gear;

[0025] Figure 8 yes Figure 6 The exploded schematic diagram of the regulating mechanism shown is shown with the drive assembly and the second bevel gear removed;

[0026] Fig. 9 yes Figure 6 Schematic diagram of the structure of the threaded shaft and movable nut of the adjusting mechanism shown. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. 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, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0028] Please refer to Figures 1 to 4 A coating device provided in one embodiment of the utility model includes a coating die 10 and a die closed-loop adjustment device.

[0029] The coating die 10 includes an upper die 11 and a lower die 12 that cooperate with each other. A gasket (not shown in the figure) is provided between the upper die 11 and the lower die 12, and a coating slit 14 is formed between the gasket and the upper die 11. The coating slit 14 has a feed port and a discharge port. The feed port is used to communicate with the slurry supply device. The upper die 11 and the lower die 12 are formed with a coating lip 13 at the position corresponding to the discharge port of the coating slit 14, and the coating lip 13 is connected with the discharge port. In actual application, the coating lip 13 is opposite to the substrate to be coated, and the slurry enters the coating slit 14 through the feed port, and then is coated on the substrate through the discharge port and the coating lip 13. The substrate is, for example, aluminum foil.

[0030] The die head closed-loop adjustment device includes a mounting frame 30 and a plurality of adjustment mechanisms 40. The mounting frame 30 is disposed at the top of the upper die head 11. The plurality of adjustment mechanisms 40 are disposed on the mounting frame 30 and the upper die head 11, respectively, and the plurality of adjustment mechanisms 40 are sequentially arranged along the length direction of the mounting frame 30. The plurality of adjustment mechanisms 40 are used to adjust the height of the coating slit 14, so as to adjust the amount of material passing through the coating slit 14. The number of the adjustment mechanisms 40 can be set according to actual conditions.

[0031] The adjustment mechanism 40 includes a driving assembly 41 , a transmission assembly, a differential thread assembly 44 and a T-block 47 .

[0032] The transmission assembly is respectively connected to the end of the output shaft 4111 of the drive assembly 41 and the top of the differential screw assembly 44. The T-block 47 is located below the differential screw assembly 44. The top of the upper die head 11 is provided with a plurality of mounting cavities 111 respectively corresponding to the T-blocks 47 of the plurality of adjustment mechanisms 40. The shape of the mounting cavity 111 matches the shape of the T-block 47. The mounting cavity 111 is vertically arranged with the coating slit 14 and communicates with the coating slit 14. The bottom ends of the plurality of mounting cavities 111 are sequentially communicated. The T-block 47 is arranged in the corresponding mounting cavity 111, and the top end of the T-block 47 extends from the top end of the corresponding mounting cavity 111 and is connected to the bottom end of the differential screw assembly 44. The bottom ends of the T-blocks 47 of the plurality of adjustment mechanisms 40 sequentially contact and are opposite to the coating slit 14. The drive assembly 41 is used to drive the T-block 47 to move up and down through the transmission assembly and the differential screw assembly 44.

[0033] Through the above structure, in actual application, in the initial state, the bottom end of the T-block 47 is flush with the bottom end of the upper die head 11. When the coating thickness of the substrate measured by the wet film thickness gauge is greater than the predetermined thickness range value, the driving assembly 41 of the multiple adjustment mechanisms 40 is controlled by the PLC controller to move, and the driving assembly 41 drives the T-block 47 to move downward through the transmission assembly and the differential screw assembly 44, so that the T-block 47 partially extends into the coating slit 14, so that the height of the coating slit 14 can be reduced, thereby reducing the amount of material passing through the coating slit 14, so that the amount of slurry coated on the substrate through the coating lip 13 will be reduced, so that the coating thickness of the substrate can be reduced, so that the coating thickness is within the predetermined range value, when the coating thickness is measured by the wet film thickness gauge. When the coating thickness of the substrate is less than the predetermined thickness range value, the PLC controller controls the driving assembly 41 of the multiple adjustment mechanisms 40 to move, and the driving assembly 41 drives the T-block 47 to move upward through the transmission assembly and the differential screw assembly 44, so that the part of the T-block 47 extending into the coating slit 14 moves out of the coating slit 14 or the height of the part of the T-block 47 extending into the coating slit 14 is reduced, so that the height of the coating slit 14 can be increased, thereby increasing the amount of material passing through the coating slit 14, so that the amount of slurry coated on the substrate through the coating lip 13 will increase, so that the coating thickness of the substrate can be increased, so that the coating thickness is within the predetermined range value, and in this way, the amount of material passing through the coating slit 14 can be adjusted. The utility model provides multiple adjustment mechanisms 40, and the driving assembly 41 drives the T-block 47 to move up and down through the transmission assembly and the differential screw assembly 44, so as to realize automatic adjustment of the height of the coating slit 14, so as to realize automatic adjustment of the amount of material passing through the coating slit 14, reduce the error caused by manual operation, ensure the consistency of the coating thickness before and after, thereby ensure the uniformity of coating, improve the adjustment efficiency, and improve the coating efficiency. And the use of a differential screw assembly to drive the T-block 47 to move up and down can improve the accuracy of the T-block 47 to move up and down, so as to realize accurate adjustment of the height of the coating slit 14, and further improve the uniformity of coating.

[0034] The structures of the mounting bracket 30 and the adjusting mechanism 40 are described in detail below.

[0035] Specific, combined Figure 5 As shown, the mounting frame 30 includes a U-shaped body 31 and two support members 32. The body 31 is arranged between the top ends of the two support members 32. The bottom ends of the two support members 32 are respectively arranged at the top end of the upper die head 11. The two support members 32 are arranged to support the body 31.

[0036] Combination Figures 6 to 9As shown, the drive assembly 41 includes a drive motor 411, and the drive motors 411 of adjacent adjustment mechanisms 40 are alternately arranged on both sides of the body 31, and the end of the output shaft 4111 of the drive motor 411 passes through the hole 3111 of the body 31 and extends into the body 31. The end of the output shaft 4111 of the drive motor 411 is connected to the transmission assembly. This arrangement of the drive motors 411 of multiple adjustment mechanisms 40 can break through the limitation of the width of the T-block 47 by the outer dimensions of the drive motor 411, and the width of the T-block 47 can be reduced to, for example, 21 mm, which greatly improves the arrangement density of the T-block 47 and further improves the uniformity of the coating.

[0037] The transmission assembly includes a transmission shaft 421, a first bevel gear 422 and a second bevel gear 423. The bottom of the body 31 is provided with a plurality of through holes 312 corresponding to the transmission assemblies of the plurality of adjustment mechanisms 40, and the transmission shaft 421 is provided through the corresponding through holes 312. The top periphery of the transmission shaft 421 is sleeved with the first bevel gear 422, and the bottom end of the transmission shaft 421 is connected to the differential screw assembly 44. The end of the output shaft 4111 of the driving motor 411 is connected to the connecting shaft 412 through a rigid coupling 413, and the second bevel gear 423 is sleeved on the end periphery of the connecting shaft 412 (the end of the connecting shaft 412 is the end of the connecting shaft 412 away from the output shaft 4111), and the second bevel gear 423 is meshed with the first bevel gear 422. The driving motor 411 is used to drive the second bevel gear 423 to rotate through the connecting shaft 412, thereby driving the first bevel gear 422 and the transmission shaft 421 to rotate.

[0038] The differential thread assembly 44 includes an outer shell 441 , an inner shell 442 , a threaded shaft 443 and a movable nut 444 .

[0039] The top end of the housing 441 is arranged at the bottom end of the body 31, and the bottom end of the housing 441 extends downward. The housings 441 of the plurality of adjustment mechanisms 40 are arranged in sequence along the length direction of the mounting frame 30. The bottom end of the transmission shaft 421 extends into the housing 441 through the top end of the housing 441. The threaded shaft 443 is arranged in the housing 441, the top end of the threaded shaft 443 is close to the bottom end of the transmission shaft 421, and the bottom end of the threaded shaft 443 is close to the bottom end of the housing 441. The inner housing 442 is arranged in the housing 441 and is sleeved on the outer periphery of the bottom end of the transmission shaft 421 and the outer periphery of the top end of the threaded shaft 443.

[0040] The threaded shaft 443 has a first thread section 4431 and a second thread section 4432. The second thread section 4432 is located below the first thread section 4431. The first thread section 4431 and the second thread section 4432 have different pitches and the same rotation direction. The movable nut 444 is arranged in the housing 441 and the movable nut 444 partially protrudes from the bottom end of the housing 441. The movable nut 444 is sleeved on the outer periphery of the threaded shaft 443 and is threadably matched with the second thread section 4432. The bottom end of the movable nut 444 is connected to the top end of the T-block 47 through a rigid coupling 445. The rotation of the transmission shaft 421 can drive the inner housing 442 to rotate relative to the housing 441, thereby driving the threaded shaft 443 to rotate relative to the housing 441, and then driving the movable nut 444 to move up and down relative to the housing 441. The up and down movement of the movable nut 444 can drive the T-block 47 to move up and down. Through the first thread 4431 and the second thread 4432 of the threaded shaft 443 , the movable nut 444 and the threaded shaft 443 can generate a differential, so that the micron-level displacement of the T-block 47 can be achieved, thereby improving the accuracy of the up and down movement of the T-block 47 .

[0041] In this embodiment, the inner wall of the outer shell 441 is formed with a first limiting step 4411 and a second limiting step 4412. The first limiting step 4411 is located below the inner shell 442 and contacts the bottom end of the inner shell 442. The outer peripheral surface of the transmission shaft 421 is formed with an annular boss 4211, the boss 4211 is located above the outer shell 441, and the top end of the inner shell 442 contacts the bottom end of the boss 4211. The boss 4211 and the first limiting step 4411 are provided to limit the inner shell 442 to prevent the inner shell 442 from moving up and down. A stopper 424 is provided in the through hole 312 of the body 31. The stopper 424 is sleeved on the outer periphery of the transmission shaft 421. The top of the boss 4211 contacts the bottom of the stopper 424. The top and bottom of the boss 4211 contact the stopper 424 and the inner shell 442 respectively, so that the transmission shaft 421 can be limited to prevent the transmission shaft 421 from moving up and down. The stopper 424 provides support for the rotation of the transmission shaft 421. The stopper 424 can be a rotating bearing, for example. The second stopper step 4412 is located below the first stopper step 4411 and above the movable nut 444. The second stopper step 4412 limits the upward movement of the movable nut 444.

[0042] The inner wall of the inner shell 442 is provided with a first groove extending along the axial direction of the inner shell 442, and the outer peripheral surface of the top end of the threaded shaft 443 is provided with a second groove 4433 corresponding to the first groove, and a key groove is formed between the first groove and the second groove 4433, and a flat key is provided in the key groove. The flat key can ensure the synchronization of the rotation between the threaded shaft 443 and the inner shell 442.

[0043] A guide member 471 is provided on the outer periphery of the T-block 47, and the guide member 471 is arranged in the corresponding installation cavity 111. The guide member 471 partially extends from the top of the corresponding installation cavity 111 and is arranged at the top of the upper die head 11. The guide member 471 can be a linear bearing, and the set guide member 471 provides support for the up and down movement of the T-block 47.

[0044] In this embodiment, the T-block 47 includes a vertical portion 47a and a horizontal portion 47b. The vertical portion 47a and the horizontal portion 47b are arranged in the corresponding installation cavity 111. The top end of the vertical portion 47a extends from the top end of the corresponding installation cavity 111 and is connected to the bottom end of the movable nut 444 of the differential thread assembly 44 through the rigid coupling 445, and the bottom end of the vertical portion 47a is connected to the top end of the horizontal portion 47b. The horizontal portions 47b of the plurality of adjustment mechanisms 40 contact and are opposite to the coating slit 14 in sequence. The movable nut 444 can drive the vertical portion 47a to move up and down, thereby driving the horizontal portion 47b to move up and down. In the initial state, the bottom end of the horizontal portion 47b is flush with the bottom end of the upper die head 11. When the horizontal portion 47b moves downward, part of the horizontal portion 47b can extend into the coating slit 14. When the horizontal portion 47b moves upward, the part of the horizontal portion 47b extending into the coating slit 14 can be moved out of the coating slit 14 or the height of the part of the horizontal portion 47b extending into the coating slit 14 can be reduced. By moving the horizontal portion 47b up and down, the height of the coating slit 14 can be adjusted.

[0045] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A die head closed-loop adjustment device, characterized in that: It includes a mounting frame and a plurality of adjustment mechanisms, wherein the plurality of adjustment mechanisms are respectively arranged on the mounting frame, and the plurality of adjustment mechanisms are sequentially arranged along the length direction of the mounting frame, and the adjustment mechanism includes a driving assembly, a transmission assembly, a differential thread assembly and a T-block, wherein the transmission assembly is respectively connected to the end of the output shaft of the driving assembly and the top end of the differential thread assembly, the T-block is located below the differential thread assembly, the top end of the T-block is connected to the bottom end of the differential thread assembly, and the bottom ends of the T-blocks of the plurality of adjustment mechanisms are sequentially contacted, and the driving assembly is used to drive the T-block to move up and down through the transmission assembly and the differential thread assembly.

2. The die head closed-loop adjustment device according to claim 1, characterized in that: The mounting frame comprises a body and two supporting members, wherein the body is arranged between top ends of the two supporting members.

3. The die head closed-loop adjustment device according to claim 2, characterized in that: The driving assembly comprises a driving motor. The driving motors of adjacent adjusting mechanisms are alternately arranged on both sides of the body. The ends of the output shafts of the driving motors extend into the body and are connected to the transmission assembly.

4. The die head closed-loop adjustment device according to claim 2, characterized in that: The transmission assembly includes a transmission shaft, a first bevel gear and a second bevel gear. The bottom of the body is provided with a plurality of through holes corresponding to the transmission assemblies of the plurality of adjustment mechanisms. The transmission shaft passes through the corresponding through holes. The first bevel gear is sleeved on the outer periphery of the top end of the transmission shaft. The end of the output shaft of the driving assembly is connected to a connecting shaft. The second bevel gear is sleeved on the outer periphery of the end of the connecting shaft. The second bevel gear is meshed with the first bevel gear.

5. The die head closed-loop adjustment device according to claim 4, characterized in that: The differential thread assembly includes an outer shell, an inner shell, a threaded shaft and a movable nut. The top end of the outer shell is arranged at the bottom end of the body, and the bottom end of the outer shell extends downward. The outer shells of the multiple adjustment mechanisms are arranged in sequence along the length direction of the mounting frame. The bottom end of the transmission shaft extends into the outer shell through the top end of the outer shell. The threaded shaft is arranged in the outer shell. The inner shell is arranged in the outer shell and is sleeved on the outer periphery of the bottom end of the transmission shaft and the outer periphery of the top end of the threaded shaft. The threaded shaft has a first section of thread and a second section of thread. The second section of thread is located below the first section of thread. The first section of thread and the second section of thread have different pitches. The movable nut is arranged in the outer shell and the movable nut partially protrudes from the bottom end of the outer shell. The movable nut is sleeved on the outer periphery of the threaded shaft and cooperates with the second section of thread. The bottom end of the movable nut is connected to the top of the T-block.

6. The die head closed-loop adjustment device according to claim 5, characterized in that: The inner wall of the outer shell is formed with a first limiting step and a second limiting step, the outer peripheral surface of the transmission shaft is formed with an annular boss, the bottom end and the top end of the inner shell are in contact with the first limiting step and the bottom end of the boss respectively, and the second limiting step is located below the first limiting step and above the movable nut.

7. The die head closed-loop adjustment device according to claim 1, characterized in that: The T-block includes a vertical portion and a horizontal portion, the top end of the vertical portion is connected to the bottom end of the differential screw assembly, the bottom end of the vertical portion is connected to the top end of the horizontal portion, and the horizontal portions of the multiple adjustment mechanisms are in contact with each other in sequence.

8. The die head closed-loop adjustment device according to claim 5, characterized in that: The bottom end of the movable nut is connected to the top end of the T-block through a coupling.

9. The die head closed-loop adjustment device according to claim 5, characterized in that: The inner wall of the inner shell is provided with a first groove extending along the axial direction of the inner shell, the outer peripheral surface of the top end of the threaded shaft is provided with a second groove corresponding to the first groove, a key groove is formed between the first groove and the second groove, and a flat key is provided in the key groove.

10. A coating device, comprising a coating die head, the coating die head comprising an upper die head and a lower die head that cooperate with each other, a gasket is provided between the upper die head and the lower die head, a coating slit is formed between the gasket and the upper die head, the coating slit has a feed inlet and a discharge outlet, the upper die head and the lower die head form a coating lip at a position corresponding to the discharge outlet of the coating slit, the coating lip is connected to the discharge outlet, characterized in that: The die head closed-loop adjustment device also includes a die head closed-loop adjustment device, which includes a mounting frame and a plurality of adjustment mechanisms. The mounting frame is arranged at the top of the upper die head, and the plurality of adjustment mechanisms are respectively arranged on the mounting frame. The plurality of adjustment mechanisms are sequentially arranged along the length direction of the mounting frame. The adjustment mechanism includes a driving assembly, a transmission assembly, a differential thread assembly and a T-block. The transmission assembly is respectively connected to the end of the output shaft of the driving assembly and the top of the differential thread assembly. The T-block is located below the differential thread assembly. The top of the upper die head is provided with a plurality of mounting cavities corresponding to the T-blocks of the plurality of adjustment mechanisms, respectively. The mounting cavities are vertically arranged with the coating slit and communicated with the coating slit. The bottom ends of the plurality of mounting cavities are sequentially communicated. The T-block is arranged in the corresponding mounting cavity, and the top end of the T-block extends from the top end of the corresponding mounting cavity and is connected to the bottom end of the differential thread assembly. The bottom ends of the T-blocks of the plurality of adjustment mechanisms sequentially contact and are opposite to the coating slit. The driving assembly is used to drive the T-block to move up and down through the transmission assembly and the differential thread assembly.

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