A slot die and coating apparatus

Abstract

The present application relates to the field of coating, especially a kind of slot coating die and coating equipment.Slot coating die includes feed pipe, die body, top cover plate and back cover plate, die body is equipped with shunt groove, liquid storage cavity, slot outlet and multiple connecting grooves, top cover plate is arranged at the top of die body, shunt groove is arranged on the top surface of die body, shunt groove cooperates with the bottom surface of top cover plate to form shunt flow passage;Back cover plate is detachably arranged on one side of die body, connecting groove is arranged on the side of die body close to back cover plate, all connecting grooves cooperate with the side of back cover plate close to die body to form multiple connecting channels.By detachable arrangement of top cover plate and back cover plate, it is convenient to clean shunt flow passage, connecting channel and the like in the interior, and the problem that residual material affects coating quality and product yield due to cleaning difficulty of traditional die can be effectively solved.

Description

Technical Field

[0001] The invention relates to the coating field, in particular to a slit coating die head and coating equipment. Background Art

[0002] In the coating process, slot coating dies are widely used in industries such as electronics and thin film manufacturing. However, in the diversion channel design of traditional dies, the diameter of the last channel is small and usually adopts a closed structure, which makes cleaning difficult. Usually, wiping with slender tools such as cotton swabs is the only option, but this method is difficult to completely remove residual material. This residual material easily solidifies or deteriorates, which can lead to problems such as streaks and uneven thickness in the subsequent coating process, ultimately affecting the product yield. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0004] The solution of the present invention to its technical problem is: a slit coating die, which includes a feed pipe, a die body, a top cover plate and a rear cover plate, the die body is provided with a diversion groove, a liquid storage chamber, a slit outlet and a plurality of connecting grooves, the top cover plate is arranged on the top of the die body, the diversion groove is arranged on the top surface of the die body, and the diversion groove cooperates with the bottom surface of the top cover plate to form a diversion channel; the rear cover plate is detachably arranged on one side of the die body, the connecting groove is arranged on a surface of the die body close to the rear cover plate, all the connecting grooves cooperate with a surface of the rear cover plate close to the die body to form a plurality of connecting channels, the feed pipe is connected to the liquid inlet end of the diversion channel, the liquid outlet end of the diversion channel is connected one-to-one with the liquid inlet end of the connecting channel, the liquid outlet end of the connecting channel is connected to the liquid storage chamber, and the liquid outlet end of the liquid storage chamber is connected to the slit outlet.

[0005] The beneficial effects of the present invention are as follows: the feed pipe introduces an external liquid source into the interior of the die; the top cover plate cooperates with the diverter groove on the top surface of the die body to form a diverter channel, and the diverter channel can be cleaned and other maintenance operations can be performed by removing the top cover plate; the diverter channel diverts the liquid so that the liquid can be dispersed more evenly; the rear cover plate cooperates with the connecting groove on the die body to form a connecting channel, and the last-stage channel can be cleaned and other maintenance operations can be performed by removing the rear cover plate; the connecting channel connects the diverter channel and the liquid storage chamber, so that the liquid enters the liquid storage chamber evenly; the liquid storage chamber plays a buffering and pressure stabilizing role, ensuring that the liquid flows to the slit outlet in a stable state; the slit outlet realizes the application of the liquid to the target surface. By detachably arranging the rear cover plate on one side of the die body, it is convenient to clean the last-stage channel, etc., which can effectively solve the problem of residual materials affecting the coating quality and product yield caused by the difficulty of cleaning the traditional die head, and help improve the uniformity of coating and product quality, and ensure the yield rate of production.

[0006] As a further improvement of the above technical solution, the rear cover plates are provided in plurality, and all the rear cover plates are matched with the connecting grooves in a one-to-one correspondence to form a plurality of the connecting channels.

[0007] As a further improvement of the above technical solution, the diversion channel includes a first channel, the first channel includes a first liquid inlet and two first liquid outlets, the first liquid inlet is connected to the feed pipe, and the first liquid outlets are connected to the connecting channel one by one.

[0008] As a further improvement of the above technical solution, the diversion channel includes a second channel, the second channel includes a second liquid inlet and three second liquid outlets, the second liquid inlet is connected to the feed pipe, and the second liquid outlets are connected to the connecting channel one by one.

[0009] As a further improvement of the above technical solution, the diversion channel includes three third channels and three fourth channels, and the top cover plate is provided with three diversion ports, the three diversion ports include a third liquid inlet and three third liquid outlets, each of the fourth channels is provided with a fourth liquid inlet and two fourth liquid outlets, the third liquid inlet is connected to the feed pipe, the third liquid outlet is connected to the fourth liquid inlet one-to-one through the third channel, and the fourth liquid outlet is connected to the connecting channel one-to-one.

[0010] As a further improvement of the above technical solution, the die body includes a first die body, a second die body and a gasket, the gasket is arranged between the first die body and the second die body, the first die body, the second die body and the gasket are fixed by bolts, the diversion groove, the liquid storage chamber and the multiple connecting grooves are all arranged on the first die body, and the second die body is provided with an adjustment groove to separate the second die body into a base and an adjustment part, and the first die body, the gasket and the adjustment part together enclose the slit outlet.

[0011] As a further improvement of the above technical solution, the adjustment groove is provided with an extension portion, and the extension portion turns and extends from one end of the adjustment groove toward the first mold body.

[0012] As a further improvement of the above technical solution, the slit coating die head also includes a plurality of slit adjustment mechanisms, which are arranged on the base at intervals along the slit length direction of the slit outlet. The slit adjustment mechanism drives the adjustment part to move closer to or away from the base, thereby adjusting the width of the slit outlet.

[0013] As a further improvement of the above technical solution, the slit adjustment mechanism includes an external hexagonal hollow bolt and an adjustment bolt, a first threaded hole is provided on the base, the first threaded hole passes through the base and is connected to the adjustment groove, the external thread of the external hexagonal hollow bolt is threadedly connected to the first threaded hole, and the adjustment part is provided with a second threaded hole that matches the adjustment bolt, the axis of the first threaded hole coincides with the axis of the second threaded hole, the adjustment bolt is passed through the external hexagonal hollow bolt, and the front end of the adjustment bolt is threadedly connected to the first threaded hole.

[0014] As a further improvement of the above technical solution, the slit adjustment mechanism includes a differential bolt, a bolt sleeve and a connecting piece, the differential bolt is provided with a first threaded section arranged at the front end of the differential bolt and a second threaded section arranged at the rear end of the differential bolt, the base is provided with a first through hole, the first through hole passes through the base and is connected to the adjustment groove, the bolt sleeve is passed through the first through hole, the bolt sleeve is connected and fixed to the base through the connecting piece, the adjustment part is provided with a third threaded hole matching the first threaded section, the axis of the second threaded hole and the first through hole coincide, the first threaded section is threadedly connected to the third threaded hole, and the second threaded section is threadedly connected to the internal thread of the bolt sleeve.

[0015] As a further improvement of the above technical solution, the connecting member is a fixing screw, the bolt sleeve is provided with a waist-shaped hole that cooperates with the fixing screw, and the base is also provided with a fourth threaded hole that cooperates with the fixing screw. The fourth threaded hole connects the first through hole and the external space, the axis of the fourth threaded hole is arranged perpendicular to the axis of the first through hole, the fixing screw is threadedly connected to the fourth threaded hole, and the front end of the fixing screw passes through the fourth threaded hole and is inserted into the waist-shaped hole of the bolt sleeve to limit the circumferential rotation of the bolt sleeve.

[0016] A coating device comprises the slit coating die as described in any one of the above items.

[0017] The coating equipment of the present invention utilizes the aforementioned slit coating die head with a fine flow channel design, flexible adjustment of the slit outlet width, and ease of cleaning and maintenance. This allows for uniform distribution and precise discharge of materials during the coating process, effectively avoiding uneven coating thickness, streaking, and other quality defects caused by uneven materials and inconsistent slit widths, thereby significantly improving the coating quality of the product and increasing the yield rate. The die head can quickly adjust the slit width to accommodate different product process requirements, and each component is easily disassembled for cleaning and maintenance. This reduces the time spent on operations such as adjusting the die head and cleaning residual materials, enabling the coating equipment to switch between different product specifications in a shorter time, ensuring a continuous and stable production process, thereby improving overall production efficiency and meeting large-scale, diversified production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0019] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0020] Figure 3 is an exploded view of an embodiment of the present invention;

[0021] Figure 4 is a cross-sectional view of another embodiment of the present invention;

[0022] Figure 5 It is a structural schematic diagram of another embodiment of the present invention;

[0023] Figure 6 yes Figure 5 Enlarged view of point A in the middle.

[0024] Reference numerals in the accompanying drawings: 100-feeding pipe, 200-die body, 210-diverter channel, 220-liquid storage chamber, 230-slit outlet, 240-connecting channel, 250-diverter groove, 260-connecting groove, 270-first die body, 280-second die body, 281-adjusting groove, 282-base, 283-adjusting part, 284-extension part, 290-gasket, 300-top cover plate, 310-three-diverter outlet, 311-third channel, 312-fourth channel, 400-rear cover plate, 500-slit adjustment mechanism, 510-external hexagonal hollow bolt, 511-adjusting bolt, 520-differential bolt, 521-bolt sleeve, 522-connecting piece, 523-waist-shaped hole. DETAILED DESCRIPTION

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the above briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only represent some embodiments of the present invention, not all embodiments. Those skilled in the art can also derive other design solutions and drawings based on these drawings without inventive effort.

[0026] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the present invention can be combined interchangeably without conflicting with each other.

[0027] In the coating process, slit coating dies are widely used in industries such as electronics and thin film manufacturing. However, in the design of the diversion channel 210 of the traditional die, the diameter of the last-stage channel is small and usually adopts a closed structure, which makes cleaning difficult. Usually, it can only be wiped with slender tools such as cotton swabs, but this method is difficult to completely remove residual materials. These residual materials are easy to solidify or deteriorate, which in turn leads to problems such as streaks and uneven thickness in the subsequent coating process, ultimately affecting the product yield.

[0028] To this end, the present invention proposes a slot coating die head, referring to Figures 1 to 4, which includes a feed pipe 100, a die body 200, a top cover plate 300 and a rear cover plate 400, the die body 200 is provided with a diverter groove 250, a liquid storage chamber 220, a slit outlet 230 and a plurality of connecting grooves 260, the top cover plate 300 is arranged on the top of the die body 200, the diverter groove 250 is arranged on the top surface of the die body 200, and the diverter groove 250 cooperates with the bottom surface of the top cover plate 300 to form a diverter flow channel 210; the rear cover plate 400 is detachably arranged on one side of the die body 200, the connecting groove 250 is arranged on the top surface of the die body 200, and the diverter groove 250 is arranged on the bottom surface of the top cover plate 300 to form a diverter flow channel 210; the rear cover plate 400 is detachably arranged on one side of the die body 200, and the connecting groove 250 is arranged on the top surface of the die body 200. 60 is arranged on a surface of the die body 200 close to the rear cover plate 400, and all the connecting grooves 260 cooperate with a surface of the rear cover plate 400 close to the die body 200 to form a plurality of connecting channels 240, the feed pipe 100 is connected to the liquid inlet end of the diverter channel 210, the liquid outlet end of the diverter channel 210 is connected one-to-one with the liquid inlet end of the connecting channel 240, the liquid outlet end of the connecting channel 240 is connected to the liquid storage chamber 220, and the liquid outlet end of the liquid storage chamber 220 is connected to the slit outlet 230.

[0029] The feed pipe 100 introduces an external liquid source into the interior of the die; the top cover plate 300 cooperates with the diverter groove 250 on the top surface of the die body 200 to form a diverter channel 210, and the diverter channel 210 can be cleaned and other maintenance operations can be performed by removing the top cover plate 300; the diverter channel 210 diverts the liquid so that the liquid can be dispersed more evenly; the rear cover plate 400 cooperates with the connecting groove 260 on the die body 200 to form a connecting channel 240, and the last-level channel can be cleaned and other maintenance operations can be performed by removing the rear cover plate 400; the connecting channel 240 connects the diverter channel 210 and the liquid storage chamber 220, so that the liquid enters the liquid storage chamber 220 evenly; the liquid storage chamber 220 plays a role of buffering and pressure stabilization, ensuring that the liquid flows to the slit outlet 230 in a stable state; the slit outlet 230 realizes the coating of the liquid onto the target surface. By detachably arranging the rear cover plate 400 on one side of the die body 200, it is convenient to clean the last-stage flow channel, etc., which can effectively solve the problem of residual materials affecting the coating quality and product yield caused by the difficulty of cleaning the traditional die, and help to improve the uniformity of coating and product quality, and ensure the yield rate of production.

[0030] The material enters the diversion channel 210 of the die body 200 through the feed pipe 100. The diversion channel 210 diverts and guides the material so that it enters the liquid storage chamber 220 through the connecting channel 240. After being temporarily stored in the liquid storage chamber 220, it is coated on the corresponding product surface from the slit outlet 230 in a relatively stable and uniform state. When cleaning is required, the top cover plate 300 and the rear cover plate 400 can be removed, and the internal structures such as the diversion groove 250 and the connecting groove 260 can be cleaned to remove residual materials.

[0031] When blockage or local damage occurs, the entire connecting channel 240-related structure needs to be checked and repaired, which consumes a lot of time and energy. Therefore, in one embodiment, the rear cover plate 400 is provided in multiple pieces, and all the rear cover plates 400 are matched with the connecting groove 260 in a one-to-one manner to form a plurality of the connecting channels 240. Multiple rear cover plates 400 are provided to form a plurality of connecting channels 240, so that each connecting channel 240 can be disassembled and cleaned separately through the corresponding rear cover plate 400. Compared with the integral structure, the materials that may remain inside each connecting channel 240 can be cleaned more accurately, avoiding mutual interference between different connecting channels 240 and ensuring the cleaning effect; if a connecting channel 240 is blocked or has other faults, it can be quickly located and repaired through the corresponding rear cover plate 400, without the need for large-scale operation of the rear cover plate 400 of the entire die head, reducing maintenance time and cost, and improving the overall stability and production efficiency of the die head.

[0032] Uneven material distribution may result in inconsistent material flow and flow rate at different positions when the material is subsequently discharged from the slit outlet 230, resulting in uneven thickness, stripes and other uneven phenomena on the product surface. Therefore, in one embodiment, the diversion channel 210 includes a first channel, the first channel includes a first liquid inlet and two first liquid outlets, the first liquid inlet is connected to the feed pipe 100, and the first liquid outlets are connected to the connecting channel 240 in a one-to-one correspondence. The first channel distributes the material coming in from the feed pipe 100 more evenly to the two corresponding connecting channels 240, thereby ensuring the uniformity of the subsequent discharge from the slit outlet 230, effectively avoiding quality problems such as thickness differences and stripes on the product surface caused by uneven material distribution, and improving the product yield.

[0033] According to experience, each flow channel can ensure uniform discharge of slits with a length of 0.5 to 0.8 meters without requiring an overly large liquid storage chamber 220. Specifically, when the length of the slit outlet 230 satisfies 0.6 m ≤ slit length < 1.2 m, the diversion channel 210 is configured as the first channel using a binary method.

[0034] When faced with a long slit, the material entering the connecting channel 240 may be unevenly distributed, resulting in inconsistent material flow and flow rate at different locations when the material is subsequently discharged from the slit outlet 230. Therefore, in one embodiment, the diverter channel 210 includes a second channel, and the second channel includes a second liquid inlet and three second liquid outlets. The second liquid inlet is connected to the feed pipe 100, and the second liquid outlets are connected to the connecting channel 240 in a one-to-one correspondence. The three-way diversion method can adapt to various slit lengths and different coating process requirements, providing a stable and uniform material flow for the subsequent different connecting channels 240, broadening the scope of application of the die head and improving its versatility.

[0035] Specifically, when the length of the slit outlet 230 satisfies 1.2 m ≤ slit length < 2.4 m, the diversion channel 210 is configured as the second channel using a three-part method.

[0036] When facing a long slit, the material entering the connecting channel 240 may be unevenly distributed, resulting in inconsistent material flow and flow rate at different positions when the material is subsequently discharged from the slit outlet 230. Figure 5-Figure 6 In one embodiment, the diversion channel 210 includes three third channels 311 and three fourth channels 312. The top cover plate 300 is provided with a three-division diversion port 310, which includes a third liquid inlet and three third liquid outlets. Each of the fourth channels 312 is provided with a fourth liquid inlet and two fourth liquid outlets. The third liquid inlet is connected to the feed pipe 100, and the third liquid outlet is connected to the fourth liquid inlet in a one-to-one correspondence through the third channel 311. The fourth liquid outlet is connected to the connecting channel 240 in a one-to-one correspondence. The material is divided into three paths through the three-division diversion port 310, and then further divided into six paths through the fourth channel 312. Finally, it is evenly transported to the liquid storage chamber 220 through the connecting channel 240, realizing multi-stage diversion on a longer slit, avoiding pressure loss and uneven distribution of materials during long-distance transportation, and ensuring uniform material flow and pressure at the entire slit outlet 230.

[0037] Specifically, when the length of the slit outlet 230 is ≥2.4m, the diversion channel 210 adopts a combination of three-division and two-division methods. The three-division outlet 310 serves as a primary diversion component for the material, dividing the material entering from the feed pipe 100 into three paths, and transporting them to the three third channels 311 through the three third liquid outlets, thereby realizing the preliminary distribution of the material; the third channel 311 connects the three-division outlet 310 and the fourth channel 312, and transports the material flowing out of the third liquid outlet to the corresponding fourth liquid inlet; the fourth channel 312 serves as a secondary diversion component, and each fourth channel 312 divides the material received from the third channel 311 into two paths again, and transports them to the two connecting channels 240 through the two fourth liquid outlets, thereby further refining the distribution of the material.

[0038] Adjusting the discharge thickness according to different coating process requirements may require large-scale disassembly and modification of the entire die, affecting production efficiency. Therefore, in one embodiment, the die body 200 includes a first die body 270, a second die body 280, and a gasket 290. The gasket 290 is arranged between the first die body 270 and the second die body 280. The first die body 270, the second die body 280, and the gasket 290 are fixed by bolts. The diverter groove 250, the liquid storage chamber 220, and the multiple connecting grooves 260 are all arranged on the first die body 270. The second die body 280 is provided with an adjustment groove 281 to separate the second die body 280 into a base 282 and an adjustment portion 283. The first die body 270, the gasket 290, and the adjustment portion 283 together enclose the slit outlet 230. By adjusting the distance between the base 282 and the adjustment part 283, the width of the slit outlet 230 can be flexibly changed. According to the different requirements of the actual coating process for the discharge thickness, the slit size can be adjusted quickly and accurately to meet diverse production needs; the first mold body 270, the second mold body 280 and the gasket 290 are fixed by bolts, which not only ensures the stability of the entire die body 200 structure, but also facilitates disassembly when needed, reducing the difficulty of repair and maintenance.

[0039] When performing the slit width adjustment operation, the adjustment portion 283 may be difficult to deform, and it may be impossible to quickly and accurately achieve the desired slit width change. Therefore, in one embodiment, the adjustment slot 281 is provided with an extension portion 284, and the extension portion 284 extends from one end of the adjustment slot 281 toward the first mold body 270. The extension portion 284 provided in the adjustment slot 281 can reduce the volume of the adjustment portion 283, because the portion where the adjustment portion 283 is connected to the base 282 needs to be thinner to be easily deformed to achieve the change in the slit width, and the turning extension design of the extension portion 284 allows the thickness of the connection portion to be more reasonably controlled, which is more in line with the requirement of easy deformation, so that the adjustment portion 283 can respond to the adjustment operation more flexibly and smoothly when adjusting the slit width, thereby improving the convenience and accuracy of the adjustment.

[0040] The traditional die can cause the shape of the slit to be difficult to guarantee as a rectangle when the slit is long, and can be a "saddle shape" with high sides and low middle or a "convex shape" with low sides and high middle, affecting the uniformity of the discharge. Thus, in an embodiment, the slit coating die further comprises a plurality of slit adjustment mechanisms 500 arranged on the base 282 along the slit length direction of the slit outlet 230, the slit adjustment mechanisms 500 driving the adjustment part 283 to move closer to or away from the base 282, thereby adjusting the width of the slit outlet 230. The plurality of slit adjustment mechanisms 500 arranged along the slit length direction of the slit outlet 230 can be individually adjusted according to the width requirements of different positions of the slit, effectively avoiding the problem of uneven discharge caused by overall deformation and other factors, improving the precision of slit width adjustment, and thus improving the coating quality; the same position can both widen and narrow the slit, because after the die is assembled, it is difficult to know in advance which position needs to be widened and which position needs to be narrowed along the length direction of the slit, and the bidirectional slit adjustment mechanism 500 can flexibly respond to different width changes at various positions of the slit due to processing, assembly, stress, etc., ensuring that the width of the entire slit outlet 230 can reach the ideal state everywhere, and ensuring uniform discharge.

[0041] The slit adjustment mechanism 500 can need to use multiple different mechanisms or complex operation steps to respectively achieve widening and narrowing during adjustment, increasing the complexity and cost of the die. Thus, in an embodiment, referring to Figure 2 , the slit adjustment mechanism 500 comprises an outer hex hollow bolt 510 and an adjustment bolt 511, the base 282 is provided with a first threaded hole, the first threaded hole penetrates the base 282 and is in communication with the adjustment groove 281, the outer thread of the outer hex hollow bolt 510 is threadedly connected with the first threaded hole, the adjustment part 283 is provided with a second threaded hole matched with the adjustment bolt 511, the axis of the first threaded hole and the second threaded hole coincide, the adjustment bolt 511 is arranged in the outer hex hollow bolt 510, and the front end of the adjustment bolt 511 is threadedly connected with the first threaded hole. By rotating the outer hex hollow bolt 510 clockwise or counterclockwise, the operations of narrowing and widening the slit can be respectively achieved, which well adapts to the complex situation of not being certain whether to widen or narrow at each position along the length direction of the slit after the die is assembled; by controlling the rotation angle and pitch of the threads of the outer hex hollow bolt 510, the displacement of the adjustment part 283 is controlled, and thus fine adjustment of the width of the slit is realized, so that the adjustment accuracy can be quantitatively controlled, the strict requirements of different coating processes on high-precision adjustment of the slit width are met, and the coating quality is improved, making the product surface coating thickness more uniform.

[0042] When the width of the slit outlet 230 needs to be adjusted, if the slit width needs to be adjusted, the outer hexagonal hollow bolt 510 is rotated clockwise, and the outer hexagonal hollow bolt 510 will approach the adjusting portion 283 along the thread of the first threaded hole until one end of the outer hexagonal hollow bolt 510 abuts against the adjusting portion 283, thereby pushing the adjusting portion 283 away from the base 282, so that the slit outlet 230 slit width becomes narrower; if the slit width needs to be adjusted, method one: rotate the outer hexagonal hollow bolt 510 counterclockwise to reset the adjusting portion 283, and then continue to rotate the outer hexagonal hollow bolt 510 counterclockwise. The hexagonal nut abuts against the nut of the adjusting bolt 511, pushing the adjusting bolt 511 and then pulling the adjusting portion 283 closer to the base 282, thereby achieving the width adjustment operation of the slit outlet 230; Method 2: Turn the outer hexagonal hollow bolt 510 counterclockwise to reset the adjusting portion 283, until its end is flush with the upper end surface of the adjusting groove 281, then start turning the adjusting bolt 511 clockwise so that its nut abuts against the nut of the outer hexagonal hollow bolt 510, and continue turning. The adjusting bolt 511 pulls the adjusting portion 283 closer to the base 282, thereby achieving the width adjustment operation of the slit outlet 230.

[0043] In order to achieve a smaller displacement, it may be necessary to process a bolt with a small pitch, which will increase the processing cost and difficulty. In addition, the strength of the bolt with a small pitch is relatively low and it is easy to be damaged during use. Figure 4The slit adjustment mechanism 500 includes a differential bolt 520, a bolt sleeve 521 and a connecting piece 522. The differential bolt 520 is provided with a first threaded section arranged at the front end of the differential bolt 520 and a second threaded section arranged at the rear end of the differential bolt 520. The base 282 is provided with a first through hole, which passes through the base 282 and is connected to the adjustment groove 281. The bolt sleeve 521 is inserted into the first through hole. The bolt sleeve 521 is fixed to the base 282 through the connecting piece 522. The adjusting portion 283 is provided with a third threaded hole that cooperates with the first threaded section. The axis of the second threaded hole coincides with the axis of the first through hole. The first threaded section is threadedly connected to the third threaded hole, and the second threaded section is threadedly connected to the internal thread of the bolt sleeve 521. The first and second thread segments of the differential bolt 520 are designed with different pitches. When the differential bolt 520 is rotated, due to the difference in pitch between the two thread segments, the actual deformation of the adjustment portion 283 is the difference in the rotational displacement of the two thread segments of the differential bolt 520. This significantly improves the displacement accuracy during the adjustment process, enabling micron-level precision adjustment, meeting the requirements of precision coating processes with extremely high coating thickness requirements, and effectively improving the consistency and stability of product quality. By rotating the differential bolt 520 in the forward or reverse direction, the slit width can be adjusted in both directions. When the differential bolt 520 is rotated clockwise, the differential bolt 520 moves toward the adjustment portion 283, pushing the adjustment portion 283 away from the base 282, narrowing the width of the slit outlet 230. When rotated counterclockwise, the differential bolt 520 moves the base 282, driving the adjustment portion 283 closer to the base 282, widening the width of the slit outlet 230. Without the need for additional tools or complex operations, the differential bolt 520 can quickly respond to adjustment needs at different positions, improving production efficiency and process flexibility.

[0044] When the differential bolt 520 is rotated, the differential bolt 520 experiences axial displacement due to the different pitches of the first and second thread segments. Assuming the pitch of the first thread segment is P1 and the pitch of the second thread segment is P2, where P1 < P2, the differential bolt 520 moves P2 for each rotation of the differential bolt 520. The first thread segment moves forward by a distance P1. Since the bolt sleeve 521 is fixed to the base 282, the adjustment portion 283 is connected to the differential bolt 520 via the first thread segment. This compresses the adjustment portion 283, causing deformation, resulting in a deformation of P2 minus P1. By properly selecting the values ​​of P1 and P2, L can be made very small, thereby achieving high-precision displacement control. For example, when P1 = 1.25 mm and P2 = 1.5 mm, L = 0.25 mm. This means that the adjustment portion 283 moves only 0.25 mm for each rotation of the differential bolt 520, significantly improving adjustment accuracy. This adjustment method based on pitch difference makes the adjustment of slit width more precise and controllable, which can meet the requirements of high-precision coating process.

[0045] During installation, it may be difficult to align the threads on the differential bolt 520 with both the internal threads of the bolt sleeve 521 and the internal threads of the third threaded hole. Therefore, in one embodiment, the connecting member 522 is a set screw, and the bolt sleeve 521 is provided with a waist-shaped hole 523 that cooperates with the set screw. The base 282 is also provided with a fourth threaded hole that cooperates with the set screw. The fourth threaded hole connects the first through hole with the external space, and the axis of the fourth threaded hole is perpendicular to the axis of the first through hole. The set screw is threadedly connected to the fourth threaded hole, and the front end of the set screw passes through the fourth threaded hole and is inserted into the waist-shaped hole 523 of the bolt sleeve 521 to limit the circumferential rotation of the bolt sleeve 521. During installation, the second threaded section of the differential bolt 520 is first threadedly connected to the internal thread of the bolt sleeve 521, and the entire assembly is then inserted into the first through-hole. The first threaded section of the differential bolt 520 is then threadedly connected to the internal thread of the third threaded hole. Finally, the bolt sleeve 521 is rotated to align the waist-shaped hole 523 with the fourth threaded hole, and the fixing screw is inserted through the fourth threaded hole into the waist-shaped hole 523, restricting circumferential rotation of the bolt sleeve 521. Pre-assembling the differential bolt 520 and the bolt sleeve 521 before inserting the entire assembly into the first through-hole avoids the difficulty of simultaneously aligning multiple threads in a narrow space. This step-by-step assembly approach reduces operational difficulty, improves assembly efficiency, and reduces assembly time and labor costs. The matching of the waist-shaped hole 523 and the fixing screw allows the bolt sleeve 521 to have a certain amount of circumferential adjustment space. During assembly, the waist-shaped hole 523 and the fourth threaded hole can be precisely aligned by rotating the bolt sleeve 521, ensuring smooth insertion and tightening of the fixing screw. This compensates for errors during processing and assembly, improves assembly accuracy, and ensures the proper operation of the differential bolt 520.

[0046] Specifically, the center distance length of the waist-shaped hole 523 is preferably equal to one time the external thread pitch of the bolt sleeve 521. If the center distance length is too long, the distance that can be used for adjustment will be wasted, and if the length is too short, it is possible that the connecting member cannot be installed in the groove formed by the waist-shaped hole.

[0047] Specifically, the waist-shaped hole can be arranged in either a vertical or horizontal direction to ensure that the connecting parts can be installed. When the waist-shaped hole is arranged vertically, the differential bolt is rotated clockwise. Due to the displacement difference caused by the different pitches of the first and second thread segments, the differential bolt as a whole will produce an axial displacement toward the adjustment portion 283. This displacement directly acts on the adjustment portion 283, pushing it to deform away from the base 282, thereby reducing the width of the slit outlet 230. When the differential bolt is rotated counterclockwise, the differential bolt first drives the bolt sleeve threadedly connected to it to move away from the adjustment portion 283. The bolt sleeve moves axially. When it moves to the lower edge of the waist-shaped hole of the bolt sleeve and hits the fixing screw, the differential bolt is further rotated counterclockwise. Because the bolt sleeve is restricted by the fixing screw and cannot move further, the rotation of the differential bolt will pull the adjustment portion 283 toward the base 282 through its connection with the adjustment portion 283, thereby increasing the width of the slit outlet 230. When the waist-shaped hole is set horizontally, the rotation of the bolt sleeve is limited to a smaller range. When it needs to be narrowed, the operation process is the same as when the waist-shaped hole is set vertically. When it needs to be widened, the differential bolt is rotated counterclockwise to first drive the bolt sleeve to rotate until the end of the horizontal waist-shaped hole is against the connecting piece. Thereafter, the differential bolt is continued to be rotated counterclockwise. The subsequent operation process is the same as the corresponding process described above.

[0048] A coating device comprises the slit coating die as described in any one of the above items.

[0049] The slit coating die features a finely divided flow channel 210, a flexibly adjustable slit outlet 230 width, and easy cleaning and maintenance. This ensures uniform material distribution and precise discharge during the coating process, effectively avoiding uneven coating thickness, streaking, and other quality defects caused by uneven material distribution and inconsistent slit widths. This significantly improves coating quality and yield rates. The die can quickly adjust the slit width to suit different product process requirements, and its components are easily disassembled for cleaning and maintenance. This reduces the time spent on operations such as die adjustment and residual material cleaning, allowing the coating equipment to switch between different product specifications in a shorter time, ensuring a continuous and stable production process, thereby improving overall production efficiency and meeting the needs of large-scale, diversified production.

[0050] The above specifically describes the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A slot coating die head, characterized in that, The invention comprises a feed pipe (100), a die body (200), a top cover plate (300) and a rear cover plate (400), wherein the die body (200) is provided with a diversion groove (250), a liquid storage chamber (220), a slit outlet (230) and a plurality of connecting grooves (260), the top cover plate (300) is arranged on the top of the die body (200), the diversion groove (250) is arranged on the top surface of the die body (200), and the diversion groove (250) cooperates with the bottom surface of the top cover plate (300) to form a diversion flow channel (210); the rear cover plate (400) is detachably arranged on the die body ( 200), the connecting groove (260) is provided on a side of the die body (200) close to the rear cover plate (400), all the connecting grooves (260) cooperate with a side of the rear cover plate (400) close to the die body (200) to form a plurality of connecting channels (240), the feed pipe (100) is connected to the liquid inlet end of the diverter channel (210), the liquid outlet end of the diverter channel (210) is connected to the liquid inlet end of the connecting channel (240) in a one-to-one correspondence, the liquid outlet end of the connecting channel (240) is connected to the liquid storage chamber (220), and the liquid storage chamber ( The liquid outlet end of the die (220) is connected to the slit outlet (230); the die body (200) includes a first die body (270), a second die body (280) and a gasket (290), the gasket (290) is arranged between the first die body (270) and the second die body (280), the first die body (270), the second die body (280) and the gasket (290) are fixed by bolt connection, the diverter groove (250), the liquid storage cavity (220) and the plurality of connecting grooves (260) are all arranged on the first die body (270), and the second die body (280) is provided with an adjustment groove (281) to The second mold body (280) is separated into a base (282) and an adjusting portion (283), and the first mold body (270), the gasket (290) and the adjusting portion (283) together enclose the slit outlet (230); the slit coating die head further comprises a plurality of slit adjustment mechanisms (500), and the plurality of slit adjustment mechanisms (500) are arranged on the base (282) at intervals along the slit length direction of the slit outlet (230), and the slit adjustment mechanisms (500) drive the adjusting portion (283) to approach or move away from the base (282), thereby adjusting the width of the slit outlet (230).

2. A slot coating die according to claim 1, characterized in that, The rear cover plates (400) are provided in multiple pieces, and all the rear cover plates (400) are matched with the connection grooves (260) in a one-to-one correspondence to form a plurality of the connection channels (240).

3. A slot coating die according to claim 1, characterized in that, The branch flow channel (210) comprises a first channel, the first channel comprising a first liquid inlet and two first liquid outlets, the first liquid inlet being connected to the feed pipe (100), and the first liquid outlets being connected to the connecting channel (240) in a one-to-one correspondence.

4. A slot coating die according to claim 1, characterized in that, The branch flow channel (210) includes a second channel, the second channel includes a second liquid inlet and three second liquid outlets, the second liquid inlet is connected to the feed pipe (100), and the second liquid outlets are connected to the connecting channel (240) in a one-to-one correspondence.

5. The slot coating die according to claim 1, characterized in that: The diversion flow channel (210) includes three third channels (311) and three fourth channels (312). The top cover plate (300) is provided with three diversion ports (310). The three diversion ports (310) include a third liquid inlet and three third liquid outlets. Each of the fourth channels (312) is provided with a fourth liquid inlet and two fourth liquid outlets. The third liquid inlets are connected to the feed pipe (100). The third liquid outlets are connected to the fourth liquid inlets in a one-to-one correspondence via the third channels (311). The fourth liquid outlets are connected to the connecting channels (240) in a one-to-one correspondence.

6. A slot coating die according to claim 1, characterized in that, The adjustment groove (281) is provided with an extension portion (284), and the extension portion (284) turns and extends from one end of the adjustment groove (281) toward the first mold body (270).

7. The slot coating die according to claim 1, characterized in that: The slit adjustment mechanism (500) includes an external hexagonal hollow bolt (510) and an adjustment bolt (511); a first threaded hole is provided on the base (282), the first threaded hole passes through the base (282) and is connected to the adjustment slot (281); the external thread of the external hexagonal hollow bolt (510) is threadedly connected to the first threaded hole; a second threaded hole is provided on the adjustment portion (283) to match the adjustment bolt (511); the axis of the first threaded hole coincides with the axis of the second threaded hole; the adjustment bolt (511) is passed through the external hexagonal hollow bolt (510), and the front end of the adjustment bolt (511) is threadedly connected to the first threaded hole.

8. The slot coating die according to claim 1, characterized in that: The slit adjustment mechanism (500) comprises a differential bolt (520), a bolt sleeve (521) and a connecting piece (522), wherein the differential bolt (520) is provided with a first threaded section arranged at the front end of the differential bolt (520) and a second threaded section arranged at the rear end of the differential bolt (520), the base (282) is provided with a first through hole, the first through hole passes through the base (282) and is connected to the adjustment slot (281), the bolt sleeve (521) is passed through the first through hole, the bolt sleeve (521) is connected and fixed to the base (282) through the connecting piece (522), the adjusting portion (283) is provided with a third threaded hole matched with the first threaded section, the axes of the third threaded hole and the first through hole coincide, the first threaded section is threadedly connected to the third threaded hole, and the second threaded section is threadedly connected to the internal thread of the bolt sleeve (521).

9. The slot coating die according to claim 8, characterized in that: The connecting member (522) is a fixing screw, and the bolt sleeve (521) is provided with a waist-shaped hole (523) that matches the fixing screw. The base (282) is also provided with a fourth threaded hole that matches the fixing screw. The fourth threaded hole connects the first through hole and the external space. The axis of the fourth threaded hole is perpendicular to the axis of the first through hole. The fixing screw is threadedly connected to the fourth threaded hole. The front end of the fixing screw passes through the fourth threaded hole and is inserted into the waist-shaped hole (523) of the bolt sleeve (521) to limit the circumferential rotation of the bolt sleeve (521).

10. A coating device, characterized in that: The invention comprises a slot coating die as described in any one of claims 1 to 9.

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