Precision coating die for micrometer

Abstract

The application relates to a micrometer precision coating die in the technical field of coating, which comprises an upper die, a middle die and a lower die, the upper die and the lower die are arranged at the upper and lower ends of the middle die respectively, a material discharging gap which is in communication with the outside is arranged between the upper die and the middle die and between the lower die and the middle die, a plurality of micrometer adjusting assemblies are sequentially arranged in the material discharging gap, the micrometer adjusting assemblies are sequentially arranged along the lengthwise extension direction of the material discharging gap, the micrometer adjusting assembly comprises a flow resistance block and a micrometer screw rod, the upper and lower layers of the double-layer micrometer precision coating die can realize the accurate control of the coating thickness through the micrometer structure. Due to the connection of the flow resistance block and the micrometer screw rod, the lifting movement of the flow resistance block can be accurately adjusted, so that the coating thickness can be finely adjusted. The design not only improves the coating precision, but also ensures the consistency and uniformity of coating due to the optimization design of the flow resistance surface at the bottom of the flow resistance block.

Description

TECHNICAL FIELD

[0001] The present application relates to the coating technology field, and in particular to a micrometer precision coating die. BACKGROUND

[0002] At present, lithium batteries develop rapidly in the new energy industry, from the initial mobile phone lithium battery to the current new energy vehicle power battery, and the power battery is mostly manufactured by a slit extrusion method. As a kind of precise wet coating technology, the working principle of slit extrusion coating is that the coating paste is extruded and sprayed along the gap of the coating die under certain pressure and flow rate and is transferred to the substrate. The slit extrusion coating has the advantages of fast speed, high precision, uniform wet thickness, closed coating system, prevention of pollutants from entering during the coating process, high utilization rate of slurry, stable slurry properties, and adaptability to different slurry viscosity and solid content range, and has stronger practicability compared with other coating processes.

[0003] At present, the existing slit extrusion coating die generally uses a micrometer adjustment die with higher adjustment precision and quantifiable adjustment to gradually replace the pin screw adjustment die, thereby improving the consistency and uniformity of coating. However, the traditional double-layer die still mainly adopts the layout mode of the upper micrometer adjustment assembly and the lower push-pull rod adjustment assembly (as shown in Figure 1 ), which results in low lower adjustment precision and unquantifiable adjustment amount. SUMMARY

[0004] The present application provides a micrometer precision coating die to solve the problems mentioned in the background.

[0005] The purpose of the present application is achieved by the following means:

[0006] A micrometer precision coating die, comprising an upper die, a middle die and a lower die, the upper die and the lower die are respectively arranged at the upper and lower ends of the middle die, a material discharge gap corresponding to the outside is arranged between the upper die and the middle die and between the lower die and the middle die, a plurality of micrometer adjustment assemblies are arranged in the material discharge gap in sequence, the plurality of micrometer adjustment assemblies are arranged in sequence along the longitudinal extension direction of the material discharge gap, the micrometer adjustment assembly comprises a choke block and a micrometer screw rod, a positioning groove for accommodating the choke block is arranged in the material discharge gap, the micrometer screw rod is connected with the choke block through a shaft coupling, the choke block can be driven to move up and down along the positioning groove by rotating the micrometer screw rod, and one side of the choke block is provided with a choke surface flush with the extension direction of the material discharge gap.

[0007] Further, a connecting shaft for connecting with the shaft coupling is arranged on the choke block, and a plurality of sealing rings are sequentially sleeved on the connecting shaft from top to bottom.

[0008] Further, the flow blocking blocks are tightly fitted in the positioning grooves, and adjacent two flow blocking blocks are tightly fitted with each other, so that the positioning grooves are sealed.

[0009] Further, the discharge gap is sequentially provided with a first flow slowing cavity and a second flow slowing cavity from outside to inside, and the volume of the second flow slowing cavity is greater than that of the first flow slowing cavity.

[0010] Further, the upper die and the middle die and the lower die and the middle die are correspondingly provided with forming gaskets.

[0011] Further, the discharge gap is sequentially provided with a first flow slowing cavity and a second flow slowing cavity from outside to inside, and the volume of the second flow slowing cavity is greater than that of the first flow slowing cavity.

[0012] Further, the upper die, the middle die, the lower die and the lip are made of ceramic or glass material.

[0013] The beneficial effects of the present application are:

[0014] By adopting the layout structure of the double-layer micrometer, the double-layer micrometer precision coating die can realize accurate control of the coating thickness. Due to the connection of the flow blocking block and the micrometer screw rod, the lifting movement of the flow blocking block can be very accurately adjusted, so as to achieve fine adjustment of the coating thickness. This design not only improves the coating precision, but also ensures the sealing during the coating process due to the tight fitting of the flow blocking block, effectively preventing the leakage of slurry.

[0015] In addition, by setting the first flow slowing cavity and the second flow slowing cavity, the coating die of the present application can perform flow slowing treatment on the slurry, which helps to reduce bubbles and stripes during the coating process and improve the coating quality. The volume of the second flow slowing cavity is greater than that of the first flow slowing cavity, which can further optimize the flow characteristics of the slurry and ensure the smoothness and uniformity of the coating process.

[0016] The setting of the forming gaskets further enhances the stability and durability of the die. They can protect the die from wear and tear, prolong the service life of the die, and when the die is replaced or repaired, the forming gaskets can be replaced individually, reducing maintenance costs.

[0017] The die and the lip made of ceramic or glass material not only improve the overall corrosion resistance, but also reduce damage to the coating substrate due to the high hardness and low friction coefficient of these materials, ensuring the coating quality, while also reducing the mixing of metal particles caused by wear and tear.

[0018] In summary, the double-layer micrometer precision coating die of the present invention has the following beneficial effects: it improves coating accuracy and uniformity, enhances the sealing and durability of the die, and reduces maintenance costs and the risk of damage to the substrate. These improvements significantly enhance the efficiency of the coating process and product quality, and have important application value for the new energy industry, especially in the field of lithium battery manufacturing. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of a double-layer coating die head in the prior art;

[0020] Figure 2 This is a cross-sectional view of a micrometer precision coating die head according to the present invention;

[0021] Figure 3 for Figure 2 Enlarged diagram of A in the middle;

[0022] Figure 4 This is a first partial cross-sectional view of the loop module in Embodiment 2;

[0023] Figure 5 This is a second partial cross-sectional view of the loop module in Embodiment 2;

[0024] Figure 6 This is a cross-sectional view of the L-shaped tube in this invention;

[0025] Figure 7 This is a schematic diagram of the first use of the loop module in Embodiment 3;

[0026] Figure 8 This is a second usage diagram of the loop module in Embodiment 3;

[0027] Figure 9 This is a partial cross-sectional view of the loop module in Embodiment 3;

[0028] Figure 10 for Figure 9 Enlarged diagram of B in the diagram;

[0029] Figure 11 This is a cross-sectional view of the loop module in Embodiment 3;

[0030] The reference numerals in the figure are as follows: 1-Coating die head, 101-Upper die, 102-Middle die, 103-Lower die, 104-Discharge slot, 105-Lip, 106-Micrometer adjustment assembly, 1061-Micrometer screw, 1062-Flow blocking block, 1063-Coupling, 1604-Flow blocking surface, 1605-Connecting shaft, 1606-Sealing ring, 107-First flow-retarding chamber, 108-Second flow-retarding chamber, 109-Positioning groove, 110-Push-pull rod adjustment assembly;

[0031] 2-circulation module, 201-circulation bin, 2011-bottom tank, 2012-protective cover, 2013-inlet, 2014-hinge structure, 202-output pipeline, 203-nozzle, 204-lifting mechanism, 205-elastic sealing pad, 206-roller, 207-driving motor, 208-scraping plate, 209-heater, 210-L-shaped pipe, 211-drainage interface, 212-solenoid valve, 213-baffle, 214-distributing plate. DETAILED DESCRIPTION

[0032] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] In this embodiment, reference is made to Figure 1 Figure 3 A micrometer precision coating die, which is a specific embodiment of the application, comprises an upper die 101, a middle die 102 and a lower die 103, the upper die 101 and the lower die 103 are respectively arranged at the upper and lower ends of the middle die 102, a discharge gap 104 corresponding to the outside is arranged between the upper die 101 and the middle die 102 and between the lower die 103 and the middle die 102, a plurality of micrometer adjusting assemblies 106 are sequentially arranged in the discharge gap 104, the micrometer adjusting assemblies 106 are sequentially arranged along the longitudinal extension direction of the discharge gap 104, the micrometer adjusting assembly 106 comprises a choke block 1062 and a micrometer screw 1061, the discharge gap 104 is provided with a positioning groove 109 for accommodating the choke block 1062, the micrometer screw 1061 is connected with the choke block 1062 through a shaft coupling 1063, the choke block 1062 can be driven to move up and down along the positioning groove 109 by rotating the micrometer screw 1061, and one side of the choke block 1062 is provided with a choke surface 1604 flush with the extension direction of the discharge gap 104.

[0035] The upper and lower layers of the double-layer micrometer precision coating die 1 are both controlled by the micrometer structure to accurately control the coating thickness. Due to the connection between the choke block 1062 and the micrometer screw 1061, the lifting movement of the choke block 1062 can be accurately adjusted, so as to finely adjust the coating thickness. This design not only improves the coating precision, but also optimizes the design of the choke surface 1604 at the bottom of the choke block 1062 to ensure the consistency and uniformity of the coating.

[0036] ​Further, the flow blocking block 1062 is provided with a connecting shaft 1605 for connecting with the shaft coupling 1063. The connecting shaft 1605 is fixedly connected to the shaft coupling 1063. When the micrometer screw rod 1061 rotates, the micrometer screw rod 1061 can drive the connecting shaft 1605 and the flow blocking block 1062 to move up and down through the shaft coupling 1063, so as to control the control accuracy of the flow blocking block 1062. The connecting shaft 1605 is sequentially sleeved with a plurality of sealing rings 1606 from top to bottom, which can improve the sealing performance of the die cavity of the die head, and avoid leakage of the slurry.

[0037] Further, the flow blocking block 1062 is tightly fitted in the positioning groove 109, and the two adjacent flow blocking blocks 1062 are tightly fitted with each other, so that the positioning groove 109 is sealed. The tight fitting of the flow blocking block 1062 and the positioning groove 109 ensures the sealing performance in the coating process, effectively preventing the leakage of the slurry. In the embodiment, in order to ensure the service life of the coating die head 1, the flow blocking block 1062 adopts high-precision fine grinding to ensure the size and assembly precision (the gap between the two adjacent flow blocking blocks 1062 is not more than 0.5 um), so that the flow blocking block 1062 can be seamlessly installed in the positioning groove 109, thereby avoiding the accumulation of the slurry in the gap of the flow blocking block 1062, and reducing the probability of the slurry dark mark of the coating die head 1.

[0038] In order to further optimize the discharging process, the first flow slowing cavity 107 and the second flow slowing cavity 108 with different sizes are sequentially arranged in the discharging gap 104. This structure can slow down the flow rate of the slurry and reduce the impact force on the die head. This design not only improves the stability of discharging, but also helps to prolong the service life of the die head. In addition, the first flow slowing cavity 107 and the second flow slowing cavity 108 can slow down the flow of the slurry, which helps to reduce bubbles and stripes in the coating process and improve the coating quality. The volume of the second flow slowing cavity 108 is greater than that of the first flow slowing cavity 107, which can further optimize the flow characteristics of the slurry and ensure the stability and uniformity of the coating process.

[0039] In addition, in order to adapt to the slurry with different viscosities, the width of the discharging gap 104 can be adjusted according to actual needs. By adjusting the width of the discharging gap 104, the flow of the slurry can be effectively controlled to ensure the uniformity and consistency of the coating process. This design makes the coating equipment more flexible and can meet various production needs.

[0040] In actual application, in order to ensure the smoothness of the discharging process, the second flow slowing cavity 108 and the first flow slowing cavity 107 are usually designed as semicircles. The semicircular shape can effectively avoid the long-term retention of the slurry in the corner, improve the flow efficiency of the slurry in the flow slowing cavity, reduce the probability of the slurry adhering to the cavity wall, reduce the maintenance cost, and improve the production efficiency. At the same time, the wear resistance of the coating layer also ensures the long-term stable operation of the equipment.

[0041] Furthermore, molding shims are correspondingly provided between the upper mold 101 and the middle mold 102, and between the lower mold 103 and the middle mold 102. The molding shims are provided with discharge ports. The width of the discharge port is determined by the size and width of the product. Therefore, different products can be produced by replacing different molding shims, reducing mold opening costs. In addition, the molding shims can protect the mold head from wear and extend the service life of the mold head. When replacing or repairing the mold head, the molding shims can be replaced separately, reducing maintenance costs.

[0042] Furthermore, a lip 105 for connecting with the outside is fitted onto the discharge slot 104. In the prior art, the coating die 1 and the lip 105 are generally made of metal materials (e.g., SUS630 or 316L stainless steel with excellent corrosion resistance). In this embodiment, in order to improve the overall service life of the coating die 1, the upper die 101, middle die 102, lower die 103 and lip 105 are replaced with ceramic or glass materials. Utilizing the excellent wear resistance, chemical inertness and weak conductivity of ceramic materials, the service life of the coating die 1 is improved. Compared with a die made of metal, the service life is increased by more than 3 times, and the generation of metal particles can be significantly reduced, thereby avoiding affecting the safety performance of the subsequent battery.

[0043] Example 2:

[0044] like Figures 4-5 As shown in the figure, the micrometer precision coating die head specifically implemented in this embodiment also includes a circulation module 2 disposed on one side of the lip 105.

[0045] The circulation module 2 includes a circulation chamber 201 and a cleaning component. One side of the circulation chamber 201 is provided with an inlet 2013 for connecting to the coating die head 1. The bottom of the circulation chamber 201 is connected to the outside via a liquid pump (not shown). The cleaning component includes an output pipe 202 and multiple nozzles 203. The multiple nozzles 203 are arranged linearly along the longitudinal extension direction of the output pipe 202. The output port of the nozzles 203 is located at the upper end of the circulation chamber 201. One end of the output pipe 202 is connected to a water inlet and an air nozzle.

[0046] In this embodiment, the water inlet is connected to an external water supply mechanism, which includes a storage tank for storing cleaning solvents (activators, purified water, etc.) and a water pump for transporting the liquid. When cleaning is performed in the circulation chamber 201, the water pump pumps the cleaning solvent in the storage tank to the output pipe 202, and multiple nozzles 203 spray the cleaning solvent evenly so that the circulation chamber 201 can be cleaned.

[0047] Further, the air nozzle is connected with an external air source (air compressor), when the circulating bin 201 completes the above cleaning operation, the air nozzle can dry the circulating bin 201 by the high pressure air input by the external air source, thereby completing all cleaning steps. Further, in order to reduce the moisture in the air, the air input at the air source needs to be filtered by the liquid-gas separator, thereby ensuring the drying efficiency of the circulating bin 201.

[0048] The circulating bin 201 in the embodiment completes the lifting action through the lifting mechanism 204 arranged at both ends. When the coating die 1 normally performs the coating operation, the circulating bin 201 needs to be moved to the lower side of the coating die 1 to avoid affecting the normal coating operation of the coating die 1. The lifting mechanism 204 is used to drive the circulating bin 201 to complete the lifting action. In the embodiment, the lifting mechanism 204 is an electric screw rod slide rail. The circulating bin 201 is mounted on the sliding block of the electric screw rod slide rail through a support, so that the circulating bin 201 is driven by the electric screw rod slide rail to move up and down.

[0049] In the embodiment, the outer edge of the inlet 2013 is provided with an elastic sealing gasket 205. During the circulating process of the slurry, the elastic sealing ring 1606 attached to the upper and lower ends of the lip 105 can effectively prevent air from entering the circulating bin 201, thereby reducing the influence of air on the slurry and maintaining the viscosity of the slurry.

[0050] In the embodiment, the two discharge slots 104 of the double-layer micrometer precision coating die 1 can respectively output two different slurries. Therefore, the circulating bin 201 in the embodiment is divided into two cavities by the partition plate 213 inside. The two cavities are respectively connected with the corresponding L-shaped pipes 210 through the openings below the two cavities. The upper end of the partition plate 213 is connected with a rotatable distribution plate 214. One end of the distribution plate 214 abuts against the upper end of the partition plate 213, and the other end of the distribution plate 214 is used to abut against between the two discharge slots 104. The slurries output by the two discharge slots 104 can be respectively circulated from the two cavities to the corresponding slurry barrels outside, thereby avoiding the mixing of two different slurries.

[0051] After the circulation is completed, the cleaning solvent and dry air from the nozzle 203 can be guided into the corresponding two cavities through the rotating distribution plate 214, so that the circulating bin 201 can be properly cleaned, thereby avoiding affecting the subsequent circulation operation. The two ends of the distribution plate 214 are provided with soft gaskets, which are used to avoid scratching the coating die 1 when the distribution plate 214 abuts against the lip 105.

[0052] Furthermore, a heater 209 is installed at the bottom of the circulation chamber 201. The heater 209 consists of a heating wire and a ceramic layer wrapped around the heating wire. When the circulation chamber 201 receives slurry, the slurry passes through the heater 209 at the bottom of the circulation chamber 201. The heat generated by the heating wire of the heater 209 keeps the slurry warm and prevents it from cooling and solidifying, thus ensuring the slurry's fluidity and reusability. This design not only extends the service life of the slurry but also reduces the risk of equipment blockage caused by slurry drying.

[0053] In this embodiment, the viscosity of the slurry is still affected to some extent during the process of circulating the slurry through the circulation module 2. Therefore, after the slurry passes through the circulation module 2, it is necessary to use a viscosity meter to detect the viscosity of the slurry in the slurry tank to avoid unqualified slurry from being put into production. The viscosity meter is preferably a commonly used viscosity meter on the market.

[0054] The measurement principle of a viscometer:

[0055] 1. Use a pump to draw the slurry from the slurry tank and send it through a pipeline to an online viscometer for measurement;

[0056] 2. After the viscosity instrument measures the viscosity, the signal is processed and either directly displayed or sent to a PLC (Programmable Logic Controller).

[0057] 3. The PLC compares the viscosity signal with the preset viscosity value. If the viscosity value is lower or higher than the set value, it will automatically adjust, such as adding solvent to reduce the viscosity or stopping the addition of solvent to maintain the viscosity.

[0058] In this embodiment, the circulation chamber 201 includes a bottom trough 2011 and a protective cover 2012. The protective cover 2012 is connected to the bottom trough 2011 via a hinge structure 2014. The bottom of the bottom trough 2011 is provided with a downwardly inclined guide. The detachable protective cover 2012 is connected to the bottom trough 2011 via the hinge structure 2014, which not only facilitates daily cleaning and maintenance, but also allows for quick opening when needed to inspect or replace internal components, improving the maintainability and flexibility of the equipment. In addition, the downwardly inclined guide facilitates the concentration of slurry at the bottom of the circulation chamber 201.

[0059] like Figure 6 As shown, the bottom of the circulation chamber 201 adopts an L-shaped pipe 210 design, which cleverly avoids the pipe blockage problem that may be caused by direct connection, and a sewage outlet 211 is provided in the middle of the L-shaped pipe 210 to facilitate the discharge of sewage generated during the cleaning process. In this embodiment, after each circulation operation, the circulation chamber 201 needs to be cleaned by the cleaning component to remove the impurities and deposits accumulated in the circulation system to ensure the smooth flow of the circulation system.

[0060] An electromagnetic valve 212 is arranged between the L-shaped pipe 210 and the liquid pump. When the cleaning operation of the circulation bin 201 is performed, the electromagnetic valve 212 is closed, and the L-shaped pipe 210 is disconnected from the liquid pump. The L-shaped pipe 210 is arranged at an angle of 15 degrees. The inclined L-shaped pipe 210 can guide the residual slurry to the drain, avoiding the accumulation of residual slurry at the electromagnetic valve 212. At the same time, the slight inclination of the L-shaped pipe 210 at an angle of 15 degrees does not affect the pumping and conveying operation of the liquid pump.

[0061] The present application adds a circulation module 2 outside the coating die 1. When the coating operation is suspended or interrupted, the circulation module 2 is connected to the lip 105 of the coating die 1, allowing the coating die 1 to continuously output slurry to the circulation bin 201. This effectively prevents the deposition and drying of slurry in the coating die 1 and the lip 105 gap. During the slurry conveying process of the coating die 1, the liquid pump conveys the slurry received by the circulation bin 201 back into the slurry tank, thereby achieving the circulation of the slurry. This effectively reduces slurry waste and prevents the deposition and drying of slurry.

[0062] When the coating operation resumes normal operation, the circulation module 2 exits the operating range of the coating die 1. The circulation module 2 simultaneously conveys all the slurry in the circulation bin 201 back to the slurry tank. The cleaning solvent and dry gas are then sequentially injected into the circulation bin 201 by the multiple nozzles 203 to clean and dry the circulation bin 201. This prevents the residual slurry in the circulation bin 201 from drying and affecting subsequent circulation operations, thereby improving the stability of the slurry circulation operation.

[0063] For the coating die 1, the innovation of the present application is that the circulation module 2 is directly integrated on one side of the lip 105, achieving the instant circulation and temperature preservation of the slurry during the coating process. When the coating operation is suspended, the circulation module 2 can quickly start and pump the slurry in the circulation bin 201 into the die interior through the liquid pump, maintaining the continuous flow and temperature stability of the slurry, and effectively preventing the drying of the slurry in the lip 105 gap. At the same time, the multiple high-precision micrometer adjustment components 106 arranged inside the coating die 1 allow users to adjust the width of the discharge gap 104 according to actual needs, which is used to accurately adjust the coating thickness to adapt to different slurry viscosity and solid content coating requirements, improving the precision and flexibility of the coating operation.

[0064] Example Three:

[0065] As shown in Figures 7-9 The circulation module 2 of the present embodiment is applied to a single-layer coating die 1. This type of single-layer coating die 1 is composed of only the upper die 101 and the lower die 103, and has only one discharge gap 104. This type of single-layer coating die 1 usually only outputs one type of slurry, so the circulation bin 201 does not need to classify the slurry.

[0066] As Figures 10-11 shown, the roller 206 for engaging the lip 105 is directly installed in the circulating bin 201, the roller 206 is rotatably installed in the circulating bin 201, one end of the circulating bin 201 is provided with a driving motor 207 for driving the roller 206, and the circulating bin 201 is provided with a scraper 208 abutting against the bottom of the roller 206, the scraper 208 is obliquely arranged at the lower end of the roller 206. The slurry input by the coating die 1 enters the circulating bin 201 through the rotatable roller 206, the rotating roller 206 correctly guides the input slurry into the circulating bin 201, avoiding the splashing of the slurry when the slurry is put into the circulating bin 201, and significantly improving the cleanliness of the lip 105.

[0067] During the process of the coating die 1 outputting the slurry to the roller 206, the coating die 1 will coat a layer of slurry film on the surface of the rotating roller 206, which is used to simulate the normal coating operation of the coating die 1, and when the roller 206 rotates to the bottom, the slurry on the roller 206 is scraped off by the scraper 208, so that the slurry is circulated to the bottom of the circulating bin 201, thereby completing the collection of the slurry and avoiding the splashing of the slurry in the circulating bin 201. The slurry collected by the circulating bin 201 is circulated to the slurry barrel through the liquid pump at the bottom of the circulating bin 201, thereby completing the slurry circulation.

[0068] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the present application, and any simple modification, equivalent change and modification of the above embodiment within the scope of the present application are all within the scope of the present application.

Claims

1. A micrometer precision coating die, comprising an upper die, a middle die and a lower die, the upper die and the lower die are respectively arranged at the upper and lower ends of the middle die, and the upper die and the middle die and the lower die and the middle die are both correspondingly provided with a material discharging gap which is in communication with the outside, characterized in that: A plurality of micrometer adjusting assemblies are arranged in the discharging slot in sequence along the longitudinal extension direction of the discharging slot, the micrometer adjusting assembly comprises a flow resistance block and a micrometer screw rod, the discharging slot is provided with a positioning groove for accommodating the flow resistance block, the micrometer screw rod is connected with the flow resistance block through a shaft coupling, the flow resistance block can be driven to move up and down along the positioning groove by rotating the micrometer screw rod, and one side of the flow resistance block is provided with a flow resistance surface flush with the extension direction of the discharging slot. A lip is embedded and installed outside the discharging slot for connection with the outside. The coating die further comprises a circulation module arranged on one side of the lip, the circulation module comprises a circulation bin, one side of the circulation bin is provided with an inlet for connecting with the coating die, the bottom of the circulation bin is connected with the outside through a liquid pump, the inside of the circulation bin is divided into two cavities by a partition plate, the upper end of the partition plate is connected with a rotatable distribution plate, one end of the distribution plate abuts against the upper end of the partition plate, and the other end abuts against between the two discharging slots, so that the slurry output by the two discharging slots can be respectively output to the two cavities; and the two ends of the circulation bin are provided with lifting mechanisms.

2. The precision coating die for a micrometer according to claim 1, characterized in that: The flow resistance block is provided with a connecting shaft for connecting with the shaft coupling, and a plurality of sealing rings are sequentially sleeved on the connecting shaft from top to bottom.

3. The precision coating die of a micrometer according to claim 1 or 2, characterized in that: The flow resistance block is tightly embedded in the positioning groove, and adjacent two flow resistance blocks are tightly embedded with each other, so that the positioning groove is sealed.

4. The precision coating die of a micrometer according to claim 1, characterized in that: The discharging slot is sequentially provided with a first flow slowing cavity and a second flow slowing cavity from outside to inside, and the volume of the second flow slowing cavity is greater than that of the first flow slowing cavity.

5. The precision coating die of a micrometer according to claim 4, characterized in that: The upper die and the middle die and the lower die and the middle die are correspondingly provided with forming gaskets.

6. The precision coating die of a micrometer according to claim 1, wherein: The upper die, the middle die, the lower die and the lip are made of ceramic or glass material.

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