Oily aramid fiber double-sided coating equipment and method

Abstract

The invention belongs to the technical field of coating equipment, and particularly relates to oily aramid fiber double-sided coating equipment and method. The double-sided coating head is assembled at the top of the coagulating tank and is close to one side of the unreeling machine, the double-sided coating head comprises a coating mechanism I and a coating mechanism II, and the coating mechanism I and the coating mechanism II are arranged in an up-down opposite manner and are used for coating the double surfaces of the diaphragm base material at the same time; the wringing traction mechanism is assembled at the tops of the coagulating tank and the washing tank, and the wringing work is completed when the base material is pulled to be transported in a mechanical pressure supply mode; and the shaping drying box is used for drying the two surfaces of the diaphragm base material by adopting a hot roller and hot air drying mode. The double-sided coating heads which are adjacently arranged up and down are adopted, so that the space can be saved to a great extent, the problem that the tension of a base material is easy to fluctuate in a coating mechanism which is arranged up and down is solved, and the problem that the thickness of a coating is not uniform or the blank is abnormal due to different tightness degrees of two sides of the base material is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coating equipment, and particularly relates to an oily aramid double-sided coating equipment and method. BACKGROUND

[0002] The double-sided coating machine is an industrial coating equipment, which is specially used for synchronously or continuously coating functional coatings (such as adhesives, conductive pastes, photosensitive inks or ceramic coatings) on both sides of a base material (such as a film, a foil, a cloth or a battery separator), and realizes synchronous coating of upper and lower surfaces of the base material or step-by-step coating of both sides through a folding path by integrating two independent coating mechanisms (such as coating heads, pressure rollers or slit dies).

[0003] Problems of the prior art: Complex mechanical structure: the double-sided coating machine needs to integrate two sets of coating heads, tension rollers and deviation correction systems, and has a large equipment footprint, for example, the parallelism of the coating rollers needs to be accurately controlled in the folding type design, otherwise, tailing or thick head and thin tail are easily caused; Base material shaking and wrinkling: the base material needs to pass through multiple groups of rollers between two times of coating, and improper tension control can cause shaking, especially at high speed, and the tightness of both sides of the base material is different, which can cause uneven coating thickness or white space abnormalities. SUMMARY

[0004] The application aims to provide an oily aramid double-sided coating equipment and method, which can greatly save space, solve the problem of base material tension fluctuation easily caused in the coating mechanism of the upper and lower layouts, and avoid the problem of uneven coating thickness or white space abnormalities caused by the tightness of both sides of the base material.

[0005] The technical scheme adopted by the application is as follows: An oily aramid double-sided coating equipment, comprising: A coagulation tank, a pay-off machine is assembled at the top of the coagulation tank, and the coagulation tank is arranged by a water washing tank, a shaping drying box and a winding machine according to the base material transportation direction; A double-sided coating head, which is assembled at the top of the coagulation tank and close to one side of the pay-off machine, and comprises a coating mechanism one and a coating mechanism two, which are arranged in an upper and lower direction, and are used for simultaneously coating both sides of the base material; A water squeezing traction mechanism, which is assembled at the top of the coagulation tank and the water washing tank, and adopts a mechanical pressure supply mode to complete the water squeezing work when the base material is transported; A shaping drying box, which adopts a drying mode of a hot roller and hot air to dry both sides of the base material.

[0006] The unwinding machine includes a vertical plate frame fixedly installed on the top of the solidification tank. A guide roller for unwinding the substrate is assembled on the top of the vertical plate frame. A flattening roller is rotatably assembled on one side of the top of the vertical plate frame, and the two flattening rollers are arranged vertically.

[0007] The double-sided coating head also includes a mounting frame fixedly installed on the top of the coagulation tank. The coating mechanism one and the track set on the top of the mounting frame form a sliding assembly. The coating mechanism two and the track set in the middle of the upright frame form a sliding assembly. Coating mechanism one and coating mechanism two have the same structure. Coating mechanism one includes a double vertical plate frame, a coating roller and a closed material box. Cylinder one is fixedly installed at both ends of the mounting frame surface, and the extension and retraction output end of cylinder one is connected to the double vertical plate frame. The coating roller is rotatably assembled on one side of the double vertical plate frame, and a servo motor one for driving the coating roller to rotate is fixedly installed at one end of the double vertical plate frame.

[0008] Both ends of the inner side of the double vertical plate frame are fixedly installed with cylinder two, and the telescopic output end of cylinder two is connected to the closed material box. A scraper is embedded and fixedly installed on the inner side of the closed material box near the coating roller. A receiving trough one is fixedly installed on the surface of the mounting frame and directly below the coating roller; a receiving trough two is fixedly installed on the surface of the middle part of the mounting frame; and a receiving trough three is fixedly installed on the middle part of the upright frame and directly below the coating mechanism two.

[0009] The water-squeezing traction mechanism includes a water-squeezing frame. The inner side of the water-squeezing frame is rotatably assembled with a guide roller one, a guide roller two, a traction roller and a guide roller three. The guide roller one is located directly below the guide roller two, and the guide roller two is located obliquely below the traction roller. A servo motor three for driving the traction roller to rotate is fixedly installed on the outer wall of one end of the water-squeezing frame. Wall blocks are fixedly installed on the side walls of the upright plates at both ends of the dewatering frame, and vertical pressure arms are rotatably assembled at the ends of the wall blocks. A cylinder three is fixedly installed on the inner wall of one end of the upright plate of the dewatering frame. The telescopic output end of the cylinder three is connected to the middle of the vertical pressure arm. A bottom roller is rotatably assembled at the end of the vertical pressure arm. The bottom roller is used to squeeze the substrate for dewatering under the mechanical control of the cylinder three.

[0010] A bevel gear is fixedly installed on the inner wall of the vertical pressure arm, and a sensor is installed on the inner wall of the wall block. A gear is installed at the input end of the sensor, and the bevel gear meshes with the gear. The inner walls of the two end plates of the dewatering frame are rotatably assembled with pressure arms. The ends of the pressure arms are jointly assembled with pressure rollers, and the outer surface of the pressure rollers is rotatably fitted with rubber rollers. The inner wall of one end plate of the dewatering frame is fixedly installed with cylinder four. The telescopic output end of cylinder four is connected to a part of the pressure arm away from the pressure roller. Under the mechanical control of cylinder four, the rubber roller is used to squeeze the substrate to perform dewatering operations.

[0011] The shaping and drying oven includes a box body, inside which hot rollers are rotated and assembled alternately. A servo motor is fixedly installed inside a transmission box located on the outer wall of the box body. All the hot rollers are connected to the output shaft of the servo motor by a track drive through a sleeved track.

[0012] The main body of the hot roller consists of an outer roller tube and an inner roller tube. The inner roller tube is integrally set on the inner wall of the outer roller tube, and there is a gap between the two. One end of the outer roller tube is integrally connected to a water inlet pipe. The water inlet pipe communicates with the gap through a water channel opened at one end. The end of the outer roller tube away from the water inlet pipe is provided with a water channel, which is used to connect the gap and the interior of the inner roller tube. The interior of the water inlet pipe is integrally set with a water outlet pipe, which communicates with the interior of the inner roller tube. There is a gap between the water inlet pipe and the water outlet pipe. The end of the water inlet pipe is sealed and rotatably assembled with a same-head inlet and outlet water pipe. One end of the same-head inlet and outlet water pipe is provided with an inlet and an outlet. The inlet communicates with the gap and the outlet communicates with the outlet pipe.

[0013] The top of the box is equipped with a heating mechanism and an exhaust fan. The heating mechanism is composed of an air inlet fan and a heating box. The top of the box has an air outlet, which is connected to the air inlet of the exhaust fan by a high-temperature hose. The top of the box is fixedly equipped with a filter box, and the inside of the filter box is filled with filter cotton. The bottom of the filter box has two integrally integrated top air boxes at both ends, and the filter box is connected to the top air box. The bottom of the top air box is provided with a first connecting pipe. Bottom air boxes are fixedly installed on the inner walls of both sides of the box. The surface of the bottom air box is provided with a second connecting pipe. The top air box and the bottom air box on the same side are connected by a high-temperature flexible hose connecting the first connecting pipe and the second connecting pipe. Air nozzles are provided at equal intervals on the inner sides of the two top air boxes and the two bottom air boxes.

[0014] A method for double-sided coating of oil-based aramid fibers, the specific steps of which are as follows: Step 1: The diaphragm substrate is unwound by an unwinding machine; Step 2: The substrate undergoes double-sided micro-recessed reverse coating via a double-sided coating head; Step 3: The substrate is subjected to immersion coagulation treatment in a coagulation tank, with a total film length of >2.4m throughout the immersion process; Step 4: The substrate leaves the coagulation tank and is washed in two separate water washing tanks. The total length of the film running through the water washing tanks is >2.4m. Step 5: The substrate leaves the washing tank and is dried and shaped in two drying ovens. The drying method uses hot rollers and hot air. The contact length of the conveyor belt is ≥8m. The surface temperature of the hot roller is 40-95℃±2℃, the temperature of the hot air is 40-80℃±2℃, the air velocity of the nozzle is 5-15m / s, and the temperature error is ±2℃ (at 100℃). Step 6: The substrate is wound up by a rewinding machine.

[0015] The technical effects achieved by this invention are as follows: This invention employs a double-sided coating head arranged vertically and adjacently, which greatly saves space and changes the design of traditional double-sided coating equipment where the two coating mechanisms are arranged separately. In addition, the coating method involves first attaching the slurry to the surface of the coating roller, and then coating it onto the substrate surface in a reverse coating manner. The rotating coating roller, while serving as a coating component, also maintains the tension of the substrate, solving the problem of substrate tension fluctuation that is prone to occur in the vertically arranged coating mechanism, and avoiding the problem of uneven coating thickness or abnormal blanking caused by uneven tension on both sides of the substrate.

[0016] The dewatering traction mechanism not only facilitates the transport of the substrate but also provides a double-sided dewatering function, enabling pretreatment of the substrate during equipment transfer and optimizing the processing effect of the substrate in the next step. In addition, the pressing process of the bottom roller on the substrate can be fed back through the meshing of bevel gears and gears. The sensor can determine the degree of pressing of the bottom roller on the substrate by the rotation angle of the gears, which is convenient for subsequent adjustment of the pressing degree according to the tension of the substrate.

[0017] The shaping and drying oven designed in this invention has alternating hot rollers inside that can contact both sides of the substrate surface, and the airflow from the upper and lower sets of air nozzles can also act on both sides of the substrate surface respectively. This shaping and drying oven uses two drying methods to dry both sides of the substrate surface at the same time, resulting in excellent drying effect and comprehensive drying area, and is suitable for double-sided coating equipment. Attached Figure Description

[0018] Figure 1 This is an integrated diagram of the double-sided coating apparatus provided in an embodiment of the present invention; Figure 2 This is a plan view of the base material transportation provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the combination of the coagulation tank, unwinding machine and double-sided coating head provided in the embodiments of the present invention; Figure 4 This is a schematic diagram of the combination of the unwinding machine and the double-sided coating head provided in an embodiment of the present invention; Figure 5 This is a structural diagram showing the distribution of coating mechanism one and coating mechanism two provided in an embodiment of the present invention; Figure 6 This is a structural diagram of a coating mechanism provided in an embodiment of the present invention; Figure 7 This is a structural diagram of the water-squeezing traction mechanism provided in an embodiment of the present invention; Figure 8 This is a cross-sectional view of the water-squeezing traction mechanism provided in an embodiment of the present invention; Figure 9 This is a front view structural diagram of the shaping and drying oven provided in an embodiment of the present invention; Figure 10 This is an internal structural diagram of the shaping and drying oven provided in an embodiment of the present invention; Figure 11 This is a cross-sectional view of the hot roller provided in an embodiment of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1. Coagulation tank; 2. Unwinder; 3. Double-sided coating head; 4. Washing tank; 5. Shaping and drying oven; 6. Dewatering traction mechanism; 7. Rewinder; 21. Stand upright; 22. Roller; 23. Flattening roller; 31. Mounting frame; 32. Coating mechanism one; 33. Coating mechanism two; 34. Receiving trough one; 35. Receiving trough two; 36. Receiving trough three; 321. Double upright plate frame; 322. Cylinder 1; 323. Coating roller; 324. Cylinder 2; 325. Enclosed material box; 326. Scraper; 327. Servo motor 1; 501. Housing; 502. Heating roller; 503. Servo motor II; 504. Air inlet fan; 505. Heating box; 506. Air filter box; 507. Top air box; 508. Bottom air box; 509. Pipeline I; 510. Pipeline II; 511. Air nozzle; 512. Air outlet; 513. Exhaust fan; 5021. Outer roller tube; 5022. Inner roller tube; 5023. Inlet pipe; 5024. Outlet pipe; 5025. Water channel one; 5026. Water channel two; 5027. Same-head inlet and outlet water pipe; 601. Dewatering frame; 602. Guide roller one; 603. Guide roller two; 604. Traction roller; 605. Guide roller three; 606. Wall block; 607. Vertical pressure arm; 608. Bottom roller; 609. Cylinder three; 610. Bevel gear; 611. Gear; 612. Servo motor three; 613. Cylinder four; 614. Pressure arm; 615. Rubber roller. Detailed Implementation

[0020] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0021] like Figures 1-11 As shown, an oil-based aramid double-sided coating device includes: The solidification tank 1 is equipped with an unwinding machine 2 on its top. The solidification tank 1 is arranged according to the transport direction of the substrate and consists of a washing tank 4, a shaping and drying box 5, and a winding machine 7.

[0022] See attached document Figures 3-4 The unwinding machine 2 includes a vertical plate frame 21 fixedly installed on the top of the solidification tank 1. A roller 22 for unwinding the substrate is assembled on the top of the vertical plate frame 21. A flattening roller 23 is rotatably assembled on one side of the top of the vertical plate frame 21, and the two flattening rollers 23 are arranged vertically.

[0023] According to the above structure, there are two washing tanks 4 and two shaping and drying boxes 5. The roller 22 is assembled by a single shaft installation method. The substrate rotation direction is positive, and the unwinding process is controlled by a magnetic powder brake. The structure of this unwinding machine 2 is all existing technology, and will not be described in detail here.

[0024] See attached document Figures 4-6 Double-sided coating head 3 is assembled on the top of the coagulation tank 1 and on one side near the unwinding machine 2. The double-sided coating head 3 includes coating mechanism 1 32 and coating mechanism 2 33. Coating mechanism 1 32 and coating mechanism 2 33 are arranged in an up-down opposite manner to coat both sides of the diaphragm substrate at the same time. The double-sided coating head 3 also includes a mounting frame 31 fixedly installed on the top of the coagulation tank 1. The coating mechanism 1 32 and the track set on the top of the mounting frame 31 form a sliding assembly. The coating mechanism 2 33 and the track set in the middle of the vertical plate frame 21 form a sliding assembly. The coating mechanism 1 32 and the coating mechanism 2 33 have the same structure. The coating mechanism 1 32 includes a double vertical plate frame 321, a coating roller 323 and a closed material box 325. Both ends of the mounting frame 31 are fixedly mounted with cylinder 1 322, and the telescopic output end of cylinder 1 322 is connected to the double vertical plate frame 321. The coating roller 323 is rotatably assembled on one side of the double vertical plate frame 321, and a servo motor 1 327 for driving the coating roller 323 to rotate is fixedly mounted on one end of the double vertical plate frame 321. The height position of the coating roller 323 is located between the two flattening rollers 23. Both ends of the inner side of the double upright plate frame 321 are fixedly installed with cylinder 324, and the telescopic output end of cylinder 324 is connected to the closed material box 325. The closed material box 325 is embedded and fixedly installed with scraper 326 on the inner side near the coating roller 323. A receiving trough 34 is fixedly installed on the surface of the mounting frame 31 and directly below the coating roller 323. A receiving trough 35 is fixedly installed on the surface of the middle part of the mounting frame 31. A receiving trough 36 is fixedly installed on the middle part of the upright frame 21 and directly below the coating mechanism 33.

[0025] According to the above structure, during the conveying process of the diaphragm substrate, coating mechanism 1 32 and coating mechanism 2 33 are arranged opposite to each other on both sides of the substrate and are used to simultaneously coat both sides of the diaphragm substrate. Taking coating mechanism 1 32 as an example, cylinder 1 322 extends and retracts to control the coating roller 323 to be in close contact with the substrate, servo motor 1 327 controls the rotation of coating roller 323, and the rotation direction is opposite to the rotation direction of the substrate. The closed material box 325 is connected to the external feeding system and attaches the slurry to the surface of coating roller 323. The scraper 326 can scrape off the excess slurry on the surface of coating roller 323. Cylinder 2 324 extends and retracts to control the distance between coating roller 323 and closed material box 325, thereby adjusting the thickness of slurry on the surface of coating roller 323. Finally, the coating of slurry is completed at the same time as coating roller 323 contacts the substrate. Coating roller 323 is a ceramic micro-concave roller with a diameter of Ø60mm, 45° oblique line, 100 lines, concave depth of 80um, and width of 600um.

[0026] The double-sided coating heads 3 arranged vertically and adjacently can save space to a great extent and change the design of the two coating mechanisms being arranged separately in traditional double-sided coating equipment. In addition, the coating method adopts the method of first attaching the slurry to the surface of the coating roller 323 and then coating it to the surface of the substrate through reverse coating. The rotating coating roller 323, while serving as a coating part, also plays the role of maintaining the tension of the substrate, thus solving the problem of substrate tension fluctuation that is prone to occur in the vertically arranged coating mechanism.

[0027] The working principle of this invention is as follows: cylinder 322 extends and retracts to control the coating roller 323 to adhere tightly to the substrate; servo motor 327 controls the rotation of the coating roller 323 in the opposite direction to the rotation direction of the substrate; the enclosed material box 325 is connected to an external feeding system and applies the slurry to the surface of the coating roller 323; the scraper 326 scrapes off excess slurry from the surface of the coating roller 323; cylinder 324 extends and retracts to control the distance between the coating roller 323 and the enclosed material box 325, thereby adjusting the thickness of the slurry on the surface of the coating roller 323; and finally, the coating of the slurry is completed at the same time as the coating roller 323 comes into contact with the substrate.

[0028] See attached document Figures 7-8 The water-squeezing traction mechanism 6 is assembled on the top of the coagulation tank 1 and the washing tank 4. It adopts a mechanical pressure supply method to complete the water-squeezing work when the substrate is transported. The dewatering traction mechanism 6 includes a dewatering frame 601. The inner side of the dewatering frame 601 is rotatably assembled with a first guide roller 602, a second guide roller 603, a traction roller 604, and a third guide roller 605. The first guide roller 602 is located directly below the second guide roller 603, and the second guide roller 603 is located obliquely below the traction roller 604. A third servo motor 612 for driving the traction roller 604 to rotate is fixedly installed on the outer wall of one end of the dewatering frame 601. Wall blocks 606 are fixedly installed on the side walls of the vertical plates at both ends of the dewatering rack 601, and vertical pressure arms 607 are rotatably assembled at the ends of the wall blocks 606. A cylinder 609 is fixedly installed on the inner wall of one end of the vertical plate of the dewatering rack 601. The telescopic output end of the cylinder 609 is connected to the middle of the vertical pressure arm 607. A bottom roller 608 is rotatably assembled at the end of the vertical pressure arm 607. The bottom roller 608 is used to squeeze the substrate for dewatering under the mechanical control of the cylinder 609. A bevel gear 610 is fixedly installed on the inner wall of the vertical pressure arm 607, and a sensor is installed on the inner wall of the wall block 606. A gear 611 is installed at the input end of the sensor, and the bevel gear 610 meshes with the gear 611. The inner walls of the two end plates of the dewatering frame 601 are rotatably assembled with pressure arms 614. The ends of the pressure arms 614 are jointly assembled with pressure rollers, and the outer surface of the pressure rollers is rotatably fitted with rubber rollers 615. The inner wall of one end plate of the dewatering frame 601 is fixedly installed with cylinder 613. The telescopic output end of cylinder 613 is connected to a part of the pressure arm 614 away from the pressure roller. Under the mechanical control of cylinder 613, rubber roller 615 is used to squeeze the substrate to perform dewatering operations.

[0029] According to the above structure, after the substrate leaves the coagulation tank 1 and the washing tank 4, it undergoes dewatering simultaneously under the traction of the dewatering traction mechanism 6. Servo motor 3 612 drives the traction roller 604 to provide the power for transporting the substrate. The substrate passes through guide roller 1 602, guide roller 2 603, traction roller 604, and guide roller 3 605 before leaving and entering the next process. During this process, cylinder 3 609 controls the bottom roller 608 to make extrusion contact with the substrate, with the contact point located between guide roller 1 602 and guide roller 2 603. Simultaneously, extrusion occurs between the bottom roller 608 and the substrate, and also between the substrate and guide rollers 1 602 and 2 603. Similarly, cylinder 4 613 controls the rubber roller 615 to make extrusion contact with the substrate, and both... The contact point is located between guide roller 603 and traction roller 604. While the rubber roller 615 is squeezing the substrate, the substrate is also squeezing the guide roller 603 and traction roller 604. In summary, under the condition that both sides of the substrate are subjected to squeezing force at the same time, the liquid remaining on the surface will be squeezed out. This squeezing and traction mechanism 6 provides a double-sided squeezing function while realizing the transportation of the substrate, realizing the pretreatment of the substrate during the equipment transfer process, and optimizing the processing effect of the substrate in the next process. In addition, the squeezing process of the bottom roller 608 on the substrate can be fed back through the meshing of bevel gear 610 and gear 611. The sensor knows the degree of squeezing of the substrate by the bottom roller 608 through the rotation angle of gear 611, which makes it convenient to adjust the squeezing degree according to the tension of the substrate.

[0030] The working principle of this invention is as follows: Servo motor 3 612 drives traction roller 604 to provide power for traction and transport of substrate. During the process, cylinder 3 609 operates to control bottom roller 608 to make extrusion contact with substrate. At the same time, extrusion occurs between bottom roller 608 and substrate, and extrusion also occurs between substrate and guide roller 1 602 and guide roller 2 603. Similarly, cylinder 4 613 operates to control rubber roller 615 to make extrusion contact with substrate. At the same time, extrusion occurs between rubber roller 615 and substrate, and extrusion also occurs between substrate and guide roller 2 603 and traction roller 604. In summary, under the condition that both sides of substrate are subjected to extrusion force at the same time, the liquid remaining on the surface will be squeezed out.

[0031] See attached document Figures 9-11 The shaping and drying oven 5 uses a hot roller 502 and hot air drying method to dry both sides of the diaphragm substrate; The shaping and drying oven 5 includes a box body 501. Inside the box body 501, hot rollers 502 are rotated and assembled in an alternating manner. A servo motor 503 is fixedly installed inside a transmission box located on the outer wall of the box body 501. One end of all the hot rollers 502 extending into the transmission box is connected to the output shaft of the servo motor 503 via a track drive. The main body of the hot roller 502 consists of an outer roller tube 5021 and an inner roller tube 5022. The inner roller tube 5022 is integrally disposed on the inner wall of the outer roller tube 5021, with a gap between them. One end of the outer roller tube 5021 is integrally connected to a water inlet pipe 5023, which communicates with the gap through a water channel 5025 at one end. The end of the outer roller tube 5021 away from the water inlet pipe 5023 has a water channel 5026, which is used to connect the gap. Inside the inner roller tube 5022, an outlet pipe 5024 is integrally installed inside the inlet pipe 5023. The outlet pipe 5024 is connected to the inside of the inner roller tube 5022, and there is a gap between the inlet pipe 5023 and the outlet pipe 5024. The end of the inlet pipe 5023 is sealed and rotatably assembled with a same-head inlet and outlet water pipe 5027. One end of the same-head inlet and outlet water pipe 5027 is provided with an inlet and an outlet. The inlet is connected to the gap and the outlet is connected to the outlet pipe 5024. The top of the housing 501 is equipped with a heating mechanism and an exhaust fan 513. The heating mechanism is assembled from an air inlet fan 504 and a heating box 505. An air outlet 512 is opened on the top of the housing 501. The air outlet 512 is connected to the air inlet of the exhaust fan 513 through a high-temperature hose. A filter box 506 is fixedly installed at the top inside the housing 501, and the inside of the filter box 506 is filled with filter cotton. The bottom of the air filter box 506 is integrally provided with top air boxes 507 at both ends, and the air filter box 506 is connected to the top air box 507. The bottom of the top air box 507 is provided with a first connecting pipe 509. Bottom air boxes 508 are fixedly installed on the inner walls of both sides of the box body 501. The surface of the bottom air box 508 is provided with a second connecting pipe 510. The top air box 507 and the bottom air box 508 on the same side are connected by a high-temperature hose connecting the first connecting pipe 509 and the second connecting pipe 510. Air nozzles 511 are provided at equal intervals on the inner sides of the two top air boxes 507 and the two bottom air boxes 508.

[0032] According to the above structure, after the substrate enters the shaping and drying oven 5, it passes around each of the hot rollers 502 in turn. The substrate is dried and shaped by the heat provided by the hot rollers 502 and the hot air in the shaping and drying oven 5. The inlet of the same-head inlet and outlet water pipe 5027 is connected to a hot water pipe. After the hot water pipe enters the second gap, it enters the first gap through the first water channel 5025. During the flow of the hot water in the first gap, it exchanges heat with the substrate to achieve the effect of heating the substrate. The hot water then flows into the inner roller tube 5022 through the second water channel 5026 and finally flows out through the outlet pipe 5024 and the outlet. In addition, airflow is delivered into the housing 501 by the air intake fan 504, and the heating box 505 is used to heat the airflow. The airflow first passes through the filter box 506 for filtration, and then enters the top air box 507 and the bottom air box 508. Finally, it is sprayed onto the surface of the substrate through each air nozzle 511 to achieve the effect of hot air drying. The air nozzle 511 blows in the opposite direction to the film movement direction, adopting a reverse blowing form. Finally, the exhaust fan 513 is used to extract the moisture inside the housing 501; In summary, the alternating hot rollers 502 can contact both sides of the substrate, and the airflow from the two sets of air nozzles 511 can also act on both sides of the substrate. This shaping and drying oven 5 uses two drying methods to dry both sides of the substrate simultaneously, resulting in excellent drying effect and comprehensive drying area, making it suitable for double-sided coating equipment.

[0033] The working principle of this invention is as follows: After the material enters the shaping and drying oven 5, it passes around each of the hot rollers 502. The inlet of the same-head inlet and outlet water pipe 5027 is connected to a hot water pipe. The hot water pipe enters the second gap and then enters the first gap through the water channel 5025. During the flow of the hot water in the first gap, it exchanges heat with the substrate to achieve the effect of heating the substrate. The hot water then flows into the inner roller tube 5022 through the second water channel 5026 and finally flows out through the outlet pipe 5024 and the outlet. In addition, the air inlet fan 504 delivers airflow into the box 501. The heating box 505 is used to heat the airflow. The airflow first passes through the filter box 506 for filtration, and then enters the top air box 507 and the bottom air box 508. Finally, it is sprayed onto the surface of the substrate through each air nozzle 511 to achieve the effect of hot air drying. The blowing direction of the air nozzle 511 is opposite to the film walking direction, adopting a reverse blowing form.

[0034] A method for double-sided coating of oil-based aramid fibers, the specific steps of which are as follows: Step 1: The diaphragm substrate is unwound by unwinding machine 2; Step 2: The substrate undergoes double-sided micro-recessed reverse coating via double-sided coating head 3; Step 3: The substrate is subjected to immersion coagulation treatment in coagulation tank 1, with a total film length of >2.4m during the immersion process; Step 4: The substrate leaves the coagulation tank 1 and is washed in two water washing tanks 4. The total length of the film running through the water washing tanks 4 is >2.4m. Step 5: The substrate leaves the washing tank 4 and is dried and shaped in two drying ovens 5. The drying method uses hot rollers 502 and hot air. The contact length of the conveyor belt is ≥8m. The surface temperature of the hot roller 502 is 40-95℃±2℃, the hot air temperature is 40-80℃±2℃, the air velocity of the air nozzle 511 is 5-15m / s, and the temperature error is ±2℃ (at 100℃). Step 6: The substrate is wound up by winding machine 7.

[0035] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. An oil-based aramid double-sided coating equipment, characterized in that, include: A coagulation tank (1) is provided with an unwinding machine (2) mounted on top of the coagulation tank (1). The coagulation tank (1) is arranged according to the transport direction of the substrate and consists of a washing tank (4), a shaping and drying box (5), and a winding machine (7). Double-sided coating head (3) is assembled on the top of the coagulation tank (1) and on one side near the unwinding machine (2). The double-sided coating head (3) includes coating mechanism one (32) and coating mechanism two (33). Coating mechanism one (32) and coating mechanism two (33) are arranged in an up-down opposite manner to coat both sides of the diaphragm substrate at the same time. The water squeezing traction mechanism (6) is assembled on the top of the coagulation tank (1) and the washing tank (4). It adopts a mechanical pressure supply method to complete the water squeezing work when the substrate is transported. The shaping and drying oven (5) uses hot rollers (502) and hot air to dry both sides of the diaphragm substrate.

2. The oil-based aramid double-sided coating equipment according to claim 1, characterized in that: The unwinding machine (2) includes a vertical plate frame (21) fixedly installed on the top of the solidification tank (1). A roller (22) for unwinding the substrate is assembled on the top of the vertical plate frame (21). A flattening roller (23) is rotatably assembled on one side of the top of the vertical plate frame (21), and the two flattening rollers (23) are arranged vertically.

3. The oil-based aramid double-sided coating equipment according to claim 2, characterized in that: The double-sided coating head (3) also includes a mounting frame (31) fixedly installed on the top of the coagulation tank (1), the coating mechanism one (32) and the track set on the top of the mounting frame (31) form a sliding assembly, and the coating mechanism two (33) and the track set in the middle of the upright frame (21) form a sliding assembly. The coating mechanism one (32) has the same structure as the coating mechanism two (33). The coating mechanism one (32) includes a double vertical plate frame (321), a coating roller (323) and a closed material box (325). Both ends of the mounting frame (31) are fixedly mounted with cylinder one (322), and the telescopic output end of cylinder one (322) is connected to the double vertical plate frame (321). The coating roller (323) is rotatably assembled on one side of the double vertical plate frame (321), and a servo motor one (327) for driving the coating roller (323) to rotate is fixedly mounted on one end of the double vertical plate frame (321).

4. The oil-based aramid double-sided coating equipment according to claim 3, characterized in that: Both ends of the inner side of the double vertical plate frame (321) are fixedly installed with cylinder two (324), and the telescopic output end of cylinder two (324) is connected to the closed material box (325). The closed material box (325) is embedded and fixedly installed with a scraper (326) near the inner side of the coating roller (323). A receiving trough one (34) is fixedly installed on the surface of the mounting frame (31) and directly below the coating roller (323). A receiving trough two (35) is fixedly installed on the surface of the middle part of the mounting frame (31). A receiving trough three (36) is fixedly installed on the middle part of the upright frame (21) and directly below the coating mechanism two (33).

5. The oil-based aramid double-sided coating equipment according to claim 1, characterized in that: The water-squeezing traction mechanism (6) includes a water-squeezing frame (601). The inner side of the water-squeezing frame (601) is rotatably assembled with a guide roller one (602), a guide roller two (603), a traction roller (604), and a guide roller three (605). The guide roller one (602) is located directly below the guide roller two (603), and the guide roller two (603) is located obliquely below the traction roller (604). A servo motor three (612) for driving the traction roller (604) to rotate is fixedly installed on the outer wall of one end of the water-squeezing frame (601). Wall blocks (606) are fixedly installed on the side walls of the upright plates at both ends of the dewatering rack (601), and vertical pressure arms (607) are rotatably assembled at the ends of the wall blocks (606). A cylinder three (609) is fixedly installed on the inner wall of the upright plate at one end of the dewatering rack (601). The telescopic output end of the cylinder three (609) is connected to the middle of the vertical pressure arm (607). A bottom roller (608) is rotatably assembled at the end of the vertical pressure arm (607). The bottom roller (608) is used to squeeze the substrate for dewatering under the mechanical control of the cylinder three (609).

6. The oil-based aramid double-sided coating equipment according to claim 5, characterized in that: A bevel gear (610) is fixedly installed on the inner wall of the vertical pressure arm (607), and a sensor is installed on the inner wall of the wall block (606). A gear (611) is installed at the input end of the sensor, and the bevel gear (610) meshes with the gear (611). The inner walls of the two end plates of the dewatering frame (601) are rotatably assembled with pressure arms (614), and the ends of the pressure arms (614) are jointly assembled with pressure rollers. The outer surface of the pressure rollers is rotatably fitted with rubber rollers (615). The inner wall of one end plate of the dewatering frame (601) is fixedly installed with cylinder four (613). The telescopic output end of cylinder four (613) is connected to a part of the pressure arm (614) away from the pressure roller. The rubber roller (615) is used to squeeze the substrate for dewatering under the mechanical control of cylinder four (613).

7. The oil-based aramid double-sided coating equipment according to claim 1, characterized in that: The shaping drying oven (5) includes a box body (501), and hot rollers (502) are mounted inside the box body (501) in an alternating rotating manner. A servo motor (503) is fixedly installed inside the transmission box located on the outer wall of the box body (501). One end of all the hot rollers (502) extending into the transmission box is connected to the output shaft of the servo motor (503) via a track drive.

8. The oil-based aramid double-sided coating equipment according to claim 7, characterized in that: The main body of the hot roller (502) is composed of an outer roller tube (5021) and an inner roller tube (5022). The inner roller tube (5022) is integrally disposed on the inner wall of the outer roller tube (5021), and there is a gap between the two. One end of the outer roller tube (5021) is integrally connected to a water inlet pipe (5023). The water inlet pipe (5023) communicates with the gap through a water channel (5025) opened at one end. A water channel (5026) is opened at the end of the outer roller tube (5021) away from the water inlet pipe (5023), and the water channel (5026) is used for connecting The water inlet pipe (5023) is integrally equipped with a water outlet pipe (5024) inside the inner roller tube (5022). The water outlet pipe (5024) is connected to the inner roller tube (5022), and there is a second gap between the water inlet pipe (5023) and the water outlet pipe (5024). The end of the water inlet pipe (5023) is sealed and rotatably assembled with a water inlet and outlet pipe (5027). One end of the water inlet and outlet pipe (5027) is provided with a water inlet and a water outlet. The water inlet is connected to the second gap, and the water outlet is connected to the water outlet pipe (5024).

9. The oil-based aramid double-sided coating equipment according to claim 7, characterized in that: The top of the housing (501) is equipped with a heating mechanism and an exhaust fan (513). The heating mechanism is assembled from an air inlet fan (504) and a heating box (505). The top of the housing (501) is provided with an air outlet (512). The air outlet (512) and the air inlet of the exhaust fan (513) are connected by a high-temperature hose. The top of the housing (501) is fixedly provided with an air filter box (506), and the air filter box (506) is filled with filter cotton. The bottom of the air filter box (506) is integrally provided with top air boxes (507) at both ends, and the air filter box (506) and the top air box (507) are connected. The bottom of the top air box (507) is provided with a first connecting pipe (509). The inner walls on both sides of the box body (501) are fixedly installed with bottom air boxes (508). The surface of the bottom air box (508) is provided with a second connecting pipe (510). The top air box (507) and the bottom air box (508) on the same side are connected by a high-temperature hose connecting the first connecting pipe (509) and the second connecting pipe (510). The inner sides of the two top air boxes (507) and the inner sides of the two bottom air boxes (508) are provided with nozzles (511) at equal intervals.

10. A method for double-sided coating of oil-based aramid fibers, using the oil-based aramid double-sided coating equipment as described in any one of claims 1-9, characterized in that, The specific steps are as follows: Step 1: The diaphragm substrate is unwound by the unwinding machine (2); Step 2: The substrate is subjected to double-sided micro-recessed reverse coating via a double-sided coating head (3); Step 3: The substrate is subjected to immersion coagulation treatment in a coagulation tank (1), with a total film length of >2.4m during the immersion process; Step 4: The substrate leaves the coagulation tank (1) and is washed in two water washing tanks (4) in succession. The total length of the film running through the water washing tank (4) is >2.4m. Step 5: The substrate leaves the washing tank (4) and is dried and shaped in two drying ovens (5) in succession. The drying method uses hot roller (502) and hot air. The contact length of the conveyor belt is ≥8m. The surface temperature of the hot roller (502) is 40-95℃±2℃, the hot air temperature is 40-80℃±2℃, the air velocity of the nozzle (511) is 5-15m / s, and the temperature error is ±2℃ (at 100℃). Step 6: The substrate is wound up by the winding machine (7).

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