Hydrogel coating device and method

Abstract

The invention discloses a hydrogel coating device and method, and relates to the technical field of hydrogel coating. The device comprises a device base, a fiber coating roll, a gel coating and spraying device and a drying device, the gel coating and spraying device is fixedly installed outside the device base, and a swing spraying assembly is fixedly installed outside the gel coating and spraying device; the swing spraying assembly comprises a first sawtooth strip, a limiting rotating block, a first rotating disc, a gel fiber coating, a swing gear and a gel spraying pipe, by arranging the swing spraying assembly, gel can be more evenly sprayed on fiber cloth, and the heating and air drying assembly is arranged to be matched with an extrusion roller, so that the gel can be more evenly sprayed on the fiber cloth. According to the gel spraying device, gel cloth can be rapidly air-dried and shaped in the production process, the gel cloth is flatter through rolling and rolling of the extrusion rolling wheels, redundant gel after spraying can automatically drop into the gel coating box to be circularly sprayed, and waste of gel spraying materials can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogel coating, and in particular to a hydrogel coating device and method. Background Art

[0002] Hydrogel is a network polymer material containing a large amount of water. It has good biocompatibility, softness and adjustable physical and chemical properties. Due to its high water content, hydrogel exhibits excellent properties in many applications, such as elasticity, swelling and breathability. Coating technology is widely used in many fields, including medical, packaging and electronics. With the increasing demand for high-performance coatings in the medical and consumer products industries, hydrogel coating technology has emerged. Various coating methods such as spraying, scraping and dipping have been continuously improved, which has improved the coating efficiency and uniformity.

[0003] In the existing solution dipping method, when dipping the hydrogel, the coating thickness is difficult to control, resulting in uneven distribution of the coated gel, and the gel spray liquid will drip after spraying, causing material waste, and the volatilization of the solvent will affect the smoothness of the gel coating during curing, thereby reducing efficiency. In response to the above problems, the inventors proposed a hydrogel coating device and method for solving the above problems. Summary of the invention

[0004] In order to solve the problems of the existing solution dipping method, when dipping the hydrogel, the coating thickness is difficult to control, resulting in uneven distribution of the gel on the coating, and the gel spraying liquid will drip after spraying, causing material waste, and the volatilization of the solvent will affect the smoothness of the gel coating during curing, thereby reducing the efficiency; the purpose of the present invention is to provide a hydrogel coating device and method, by setting a swing spraying component, the gel can be sprayed on the fiber cloth more evenly, and a heating and air-drying component is set to cooperate with an extrusion roller, so that the gel cloth can be air-dried and shaped faster during production, and the rolling and rolling of the extrusion roller can make it smoother, and by designing that the gel fiber coating is placed above the gel coating box for spraying, the excess gel after spraying can be automatically dripped into the gel coating box for cyclic spraying, which can reduce the waste of gel spraying materials.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a hydrogel coating device, comprising a device base, a fiber coating roll, a gel coating spraying device and a drying device, wherein the gel coating spraying device is fixedly installed on the outside of the device base, the drying device is fixedly connected to the device base, the fiber coating roll is movable on the outside of the device base, and a swing spraying assembly is fixedly installed on the outside of the gel coating spraying device, wherein the swing spraying assembly comprises a No. 1 sawtooth bar, a limit rotating block, a No. 1 turntable, a gel fiber coating, a swing gear and a gel spraying pipe;

[0006] A heating and air-drying component is fixedly installed outside the drying device, and the heating and air-drying component includes an air-drying fan, a fourth rotating shaft and a heating metal pipe.

[0007] Preferably, the device base is rotatably connected to a No. 1 rotating shaft on the outside, a No. 1 gear is fixedly installed on the outside of the No. 1 rotating shaft, the device base is rotatably connected to a No. 2 rotating shaft on the outside, a transmission roller is fixedly installed on the outside of the No. 2 rotating shaft, the transmission roller is in contact with the gel fiber coating, the fiber coating roll is fixedly installed on the outside of the No. 1 rotating shaft, the device base is fixedly installed with a No. 3 motor on the outside, the device base is rotatably connected to a No. 3 gear on the outside, the No. 3 motor is rotatably connected to a No. 2 gear on the outside, the No. 2 gear is meshed with the No. 1 gear, and the No. 2 gear is meshed with the No. 3 gear.

[0008] Preferably, a gel coating box is fixedly mounted on the outside of the device base, the gel fiber coating is fixedly mounted on the outside of the fiber coating roll, the gel fiber coating runs through the gel coating box, a filtering device is fixedly mounted on the outside of the gel coating box, a gel pipe is fixedly mounted on the outside of the filtering device, a gel spray pump is fixedly mounted on the outside of the gel pipe, and the gel pipe is rotationally connected to the swing gear.

[0009] Preferably, a No. 1 fixed block is fixedly installed on the outside of the gel coating spraying device, a No. 1 motor is fixedly installed on the outside of the No. 1 fixed block, a No. 3 rotating shaft is externally rotatably connected to the No. 1 motor, and the No. 3 rotating shaft is fixedly connected to the No. 1 turntable.

[0010] Preferably, the No. 1 turntable is externally rotatably connected to a No. 1 sliding rod, the end of the No. 1 sliding rod away from the No. 1 turntable is rotatably connected to the No. 1 sawtooth bar, the No. 1 sawtooth bar is meshed with the swing gear, and the device base is externally rotatably connected to a limited rotation block, and the limited rotation block is in contact with the No. 1 sawtooth bar.

[0011] Preferably, a No. 2 fixed block is slidably connected to the outside of the device base, and an extrusion roller is rotatably connected to the outside of the No. 2 fixed block, and the extrusion roller is in contact with the gel fiber coating. A No. 2 sliding rod is fixedly installed on the outside of the No. 2 fixed block, and a No. 1 spring is fixedly installed on the outside of the No. 2 fixed block, and one end of the No. 1 spring away from the No. 2 fixed block is fixedly connected to the No. 2 sliding rod.

[0012] Preferably, the gel coating spraying device is rotatably connected to a gel spraying tube on the outside, a gel spraying port is fixedly installed on the outside of the gel spraying tube, the gel spraying tube is fixedly connected to the swing gear, and one end of the gel spraying tube away from the swing gear is rotatably connected to a limiting fixing plate.

[0013] Preferably, a heating metal tube is fixedly installed on the outside of the drying device, a drying fan is rotatably connected to the outside of the drying device, a No. 1 right-angle gear is fixedly installed on the outside of the drying fan, and the No. 4 rotating shaft rotates on the outside of the drying device.

[0014] Preferably, a No. 2 motor is fixedly mounted on the outside of the No. 4 rotating shaft, a No. 2 right-angle gear is fixedly mounted on the outside of the No. 4 rotating shaft, and the No. 2 right-angle gear is meshed with the No. 1 right-angle gear.

[0015] A method for using a hydrogel coating device comprises the following steps:

[0016] Step 1: First, select a suitable hydrogel spray liquid, such as polyvinyl alcohol or polyacrylamide, and use deionized water or other appropriate solvents to prepare a hydrogel solution. Add the selected hydrogel material into an appropriate amount of solvent, heat or stir until completely dissolved, and form a uniform hydrogel solution and put it into the gel fiber coating;

[0017] Step 2: Use a filter to remove bubbles and impurities to avoid blockage during the spraying process, and set the gel spray pump to adjust the spray pressure, nozzle diameter and coating speed to ensure uniform spray and suitable for the required coating thickness, and test on a small area to confirm the spraying effect and material adhesion;

[0018] Step 3: Spray the hydrogel evenly on the surface of the substrate to be coated through the gel spray port. The spraying distance and angle can be controlled by rotating the swing gear to ensure uniform coating. The fiber coating roll and the transmission roller are driven to rotate by the rotation of the second gear to maintain a uniform speed to ensure consistent coating thickness.

[0019] Step 4: After spraying, the curing of the hydrogel is accelerated by heating with a heating metal tube and drying with an air-drying fan, and the hydrogel is made smoother by rolling with an extrusion roller. During the spraying process, excess hydrogel automatically drips into the paint box for recycling to reduce waste.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. In the present invention, by providing a swing spraying assembly, the gel can be sprayed on the fiber cloth more evenly. The rotation of the No. 1 turntable (307) can drive the No. 1 sawtooth bar (309) to move left and right, thereby driving the gel spraying port (303) to swing left and right. The swing spraying can ensure that the gel is distributed more evenly on the fiber cloth, avoiding the situation of excessive or insufficient local gel, thereby improving the consistency of the product. The uniform coating can enhance the adhesion between the gel and the fiber cloth, improve the overall performance of the material, and make the gel uniformly coated to help improve the functional characteristics of the final product, such as air permeability, flexibility and waterproofness.

[0022] 2. In the present invention, by providing a heating and air-drying component in conjunction with an extrusion roller (201), the gel cloth can be air-dried and shaped more quickly during production, and the extrusion roller (201) can be rolled and pressed to make it smoother. The heating and air-drying component can increase the drying speed of the gel cloth, shorten the production cycle, and improve production efficiency. Rapid air-drying helps the gel cloth to be quickly shaped in the initial stage, thereby maintaining the desired shape and structure, thereby improving the consistency of the product. The rolling roller makes the gel cloth smoother during the drying process, reduces wrinkles and irregularities, and improves the surface quality. After rolling, the contact between the gel cloth and the substrate is closer, which helps to improve adhesion, thereby improving the overall performance of the material.

[0023] 3. In the present invention, the gel fiber coating (315) is placed above the gel coating box (314) for spraying by design, and the excess gel after spraying can be automatically dripped into the gel coating box (314) for cyclic spraying, which can reduce the waste of gel spraying materials. The excess gel can automatically drip back into the coating box, which avoids the waste of materials during the spraying process, thereby saving production costs, recycling the excess gel, improving the utilization rate of the coating, and ensuring that the material can be used to the maximum extent each time it is sprayed. By recycling the excess gel, the pollution and cleaning work in the working area can be reduced, and the cleanliness of the production environment can be improved. The automatic dripping and recycling mechanism makes the spraying process more efficient, simplifies the operation process, and reduces the need for manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2It is a schematic diagram of the structure of the gel coating spraying device of the present invention.

[0027] Figure 3 It is a structural cross-sectional view of the gel coating spraying device of the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of the fiber coating roll of the present invention.

[0029] Figure 5 It is a cross-sectional view of the base structure of the device of the present invention.

[0030] Figure 6 For the present invention Figure 2 A schematic diagram of the enlarged structure in the middle.

[0031] Figure 7 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B in the middle.

[0032] In the figure: 1. Device base; 2. Fiber coating roll; 201. Extrusion roller; 202. No. 2 fixed block; 203. No. 1 spring; 204. No. 2 sliding rod; 205. No. 2 rotating shaft; 206. Transmission roller; 207. No. 3 motor; 208. No. 2 gear; 209. No. 3 gear; 210. No. 1 gear; 211. No. 1 rotating shaft; 3. Gel coating spraying device; 301. Limiting fixed plate; 302. Gel spraying tube; 303. Gel spraying port; 304. No. 1 fixed block; 305. No. 1 No. 1 motor; 306, No. 3 rotating shaft; 307, No. 1 turntable; 308, No. 1 sliding rod; 309, No. 1 sawtooth bar; 310, limit rotating block; 311, filtering device; 312, gel pipeline; 313, gel spray pump; 314, gel coating box; 315, gel fiber coating; 316, swing gear; 4, drying device; 401, air drying fan; 402, No. 1 right angle gear; 403, No. 2 right angle gear; 404, No. 4 rotating shaft; 405, No. 2 motor; 406, heating metal tube. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example: Figure 1-7As shown, the present invention provides a hydrogel coating device, comprising a device base 1, a fiber coating roll 2, a gel coating spraying device 3 and a drying device 4, wherein the gel coating spraying device 3 is fixedly installed on the outside of the device base 1, the drying device 4 is fixedly connected to the device base 1, the fiber coating roll 2 is movable on the outside of the device base 1, and a swing spraying assembly is fixedly installed on the outside of the gel coating spraying device 3, and the swing spraying assembly comprises a No. 1 sawtooth bar 309, a limit rotation block 310, a No. 1 turntable 307, a gel fiber coating 315, a swing gear 316 and a gel spraying pipe 302;

[0035] A heating and air-drying component is fixedly installed outside the drying device 4 , and the heating and air-drying component includes an air-drying fan 401 , a fourth rotating shaft 404 and a heating metal tube 406 .

[0036] The outside of the device base 1 is rotatably connected to a No. 1 rotating shaft 211, and a No. 1 gear 210 is fixedly installed on the outside of the No. 1 rotating shaft 211. The outside of the device base 1 is rotatably connected to a No. 2 rotating shaft 205, and a transmission roller 206 is fixedly installed on the outside of the No. 2 rotating shaft 205. The transmission roller 206 is in contact with the gel fiber coating 315. The fiber coating roll 2 is fixedly installed on the outside of the No. 1 rotating shaft 211. The outside of the device base 1 is fixedly installed with a No. 3 motor 207, and the outside of the device base 1 is rotatably connected to a No. 3 gear 209. The outside of the No. 3 motor 207 is rotatably connected to a No. 2 gear 208. The No. 2 gear 208 is meshed with the No. 1 gear 210, and the No. 2 gear 208 is meshed with the No. 3 gear 209.

[0037] By adopting the above technical solution, the second gear 208 is meshed with the first gear 210 and the second gear 208 is meshed with the third gear 209, and the second gear 208 can be used to rotate to drive the fiber coating roll 2 and the transmission roller 206 to rotate, so that the gel fiber coating 315 can be evenly moved in the gel coating spraying device 3.

[0038] A gel coating box 314 is fixedly installed on the outside of the device base 1, a gel fiber coating 315 is fixedly installed on the outside of the fiber coating roll 2, the gel fiber coating 315 passes through the gel coating box 314, a filtering device 311 is fixedly installed on the outside of the gel coating box 314, a gel pipe 312 is fixedly installed on the outside of the filtering device 311, a gel spray pump 313 is fixedly installed on the outside of the gel pipe 312, and the gel pipe 312 is rotationally connected to the swing gear 316.

[0039] By adopting the above technical solution, the gel pipe 312 is rotatably connected to the swing gear 316, and the rotation of the swing gear 316 can be used to swing the gel spray port 303 left and right. The swing spraying can ensure that the gel is distributed more evenly on the fiber cloth to avoid the situation of excessive or insufficient gel in some parts.

[0040] A fixed block No. 1 304 is fixedly installed on the outside of the gel coating spraying device 3, and a motor No. 1 305 is fixedly installed on the outside of the fixed block No. 1 304. The motor No. 1 305 is externally rotatably connected to a third shaft 306, and the third shaft 306 is fixedly connected to a turntable No. 1 307. The turntable No. 1 307 is externally rotatably connected to a sliding rod 308, and the end of the sliding rod 308 away from the turntable No. 1 307 is rotatably connected to a sawtooth bar No. 1 309, and the sawtooth bar No. 1 309 is meshed with a swing gear 316. The device base 1 is externally rotatably connected to a limited rotation block 310, and the limited rotation block 310 is fitted with the sawtooth bar No. 1 309.

[0041] By adopting the above technical solution, the first sawtooth bar 309 is meshed with the swing gear 316, and the first turntable 307 can be rotated to drive the first sawtooth bar 309 to move left and right, thereby driving the gel spraying port 303 to swing.

[0042] The outside of the device base 1 is slidably connected to a No. 2 fixed block 202, the outside of the No. 2 fixed block 202 is rotatably connected to an extrusion roller 201, the extrusion roller 201 is in contact with the gel fiber coating 315, the outside of the No. 2 fixed block 202 is fixedly installed with a No. 2 sliding rod 204, the outside of the No. 2 fixed block 202 is fixedly installed with a No. 1 spring 203, and the end of the No. 1 spring 203 away from the No. 2 fixed block 202 is fixedly connected to the No. 2 sliding rod 204.

[0043] By adopting the above technical solution, the end of the No. 1 spring 203 away from the No. 2 fixed block 202 is fixedly connected to the No. 2 sliding rod 204, and the elastic potential energy of the No. 1 spring 203 can be used to enable the extrusion roller 201 to extrude the gel fiber coating 315, so that the hydrogel coating is smoother.

[0044] The gel coating spraying device 3 is externally rotatably connected with a gel spraying tube 302, the gel spraying tube 302 is externally fixedly provided with a gel spraying port 303, the gel spraying tube 302 is fixedly connected with a swing gear 316, and one end of the gel spraying tube 302 away from the swing gear 316 is rotatably connected with a limited fixed plate 301.

[0045] By adopting the above technical solution, the end of the gel spraying tube 302 away from the swing gear 316 is rotatably connected to the limiting fixing plate 301 , and the limiting fixing plate 301 can be used to limit the gel spraying tube 302 .

[0046] A heating metal tube 406 is fixedly installed on the outside of the drying device 4, and a drying fan 401 is rotatably connected to the outside of the drying device 4. A No. 1 right-angle gear 402 is fixedly installed on the outside of the drying fan 401. A No. 4 rotating shaft 404 rotates on the outside of the drying device 4. A No. 2 motor 405 is fixedly installed on the outside of the No. 4 rotating shaft 404. A No. 2 right-angle gear 403 is fixedly installed on the outside of the No. 4 rotating shaft 404, and the No. 2 right-angle gear 403 is meshed with the No. 1 right-angle gear 402.

[0047] By adopting the above technical solution, the second right-angle gear 403 is meshed with the first right-angle gear 402, and the fourth rotating shaft 404 can be used to drive the air-drying fan 401 to rotate, so that the gel cloth can be air-dried and shaped faster during production. The drying speed of the gel cloth can be increased by heating the air-drying component, shortening the production cycle and improving production efficiency.

[0048] A method for using a hydrogel coating device comprises the following steps:

[0049] Step 1: First, select a suitable hydrogel spray liquid, such as polyvinyl alcohol or polyacrylamide, and use deionized water or other appropriate solvents to prepare a hydrogel solution. Add the selected hydrogel material into an appropriate amount of solvent, heat or stir until completely dissolved, and form a uniform hydrogel solution, which is then placed in the gel fiber coating 315;

[0050] Step 2: Use the filter device 311 to remove bubbles and impurities to avoid blockage during the spraying process, and set the gel spray pump 313 to adjust the spraying pressure, nozzle diameter and coating speed to ensure uniform spraying and suitable for the required coating thickness, and test on a small area to confirm the spraying effect and material adhesion;

[0051] Step 3: The hydrogel is uniformly sprayed on the surface of the substrate to be coated through the gel spray port 303. The spraying distance and angle can be controlled by the rotation of the swing gear 316 to ensure uniform coating. The fiber coating roll 2 and the transmission roller 206 are driven to rotate by the rotation of the second gear 208 so as to maintain a uniform speed to ensure a uniform coating thickness.

[0052] Step 4: After spraying is completed, the curing of the hydrogel is accelerated by heating the heating metal tube 406 and air drying the air drying fan 401, and the squeezing roller 201 is used to roll and roll the hydrogel to make it smoother. During the spraying process, excess hydrogel automatically drips into the paint box for recycling to reduce waste.

[0053] Working principle: When a hydrogel coating device and method is needed, the hydrogel solution is put into the gel fiber coating 315, and the hydrogel solution can be sprayed on the gel fiber coating 315 from the gel spray port 303 through the gel spray pump 313. At the same time, the No. 1 motor 305 is used to drive the No. 3 rotating shaft 306 to rotate, and the No. 1 rotating disk 307 can be driven to rotate through the rotation of the No. 3 rotating shaft 306, and the No. 1 rotating disk 307 can be driven to move through the rotation of the No. 1 sliding rod 308, and the No. 1 sawtooth bar 309 can be driven to move through the movement of the No. 1 sliding rod 308. Finally, the swing gear 316 can be driven to rotate through the movement of the No. 1 sawtooth bar 309, so that the No. 1 rotating disk 307 can drive the No. 1 sawtooth bar 309 to move left and right, thereby driving the gel spray port 303 to swing left and right. The use of swing spraying can ensure that the gel is distributed more evenly on the fiber cloth, avoiding the situation of excessive or insufficient local content, thereby improving the consistency of the product;

[0054] When the spraying is completed, the No. 4 rotating shaft 404 is driven to rotate by the No. 2 motor 405, and the rotation of the No. 4 rotating shaft 404 drives the air-drying fan 401 to rotate, and finally the heating of the heating metal tube 406 and the air-drying of the air-drying fan 401 are used to accelerate the curing of the hydrogel, and the rolling and rolling of the extrusion roller 201 make it smoother, and the excess gel after spraying can be automatically dripped into the gel coating box 314 for cyclic spraying, which can reduce the waste of gel spraying materials. The excess gel can automatically drip back into the coating box, avoiding the waste of materials during the spraying process.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hydrogel coating device, comprising a device base (1), a fiber coating roll (2), a gel coating spraying device (3) and a drying device (4), characterized in that: The gel coating spraying device (3) is fixedly mounted on the outside of the device base (1); the drying device (4) is fixedly connected to the device base (1); the fiber coating roll (2) is movable on the outside of the device base (1); a swing spraying assembly is fixedly mounted on the outside of the gel coating spraying device (3); the swing spraying assembly comprises a No. 1 sawtooth bar (309), a limit rotation block (310), a No. 1 turntable (307), a gel fiber coating (315), a swing gear (316) and a gel spraying pipe (302); The drying device (4) is fixedly provided with a heating and air-drying component on the outside, and the heating and air-drying component comprises an air-drying fan (401), a fourth rotating shaft (404) and a heating metal tube (406).

2. A hydrogel coating device as claimed in claim 1, characterized in that: The device base (1) is externally rotatably connected to a No. 1 rotating shaft (211), and a No. 1 gear (210) is fixedly installed on the outside of the No. 1 rotating shaft (211). The device base (1) is externally rotatably connected to a No. 2 rotating shaft (205), and a transmission roller (206) is fixedly installed on the outside of the No. 2 rotating shaft (205). The transmission roller (206) is in contact with the gel fiber coating (315). The fiber coating roll (2) is fixedly installed on the outside of the No. 1 rotating shaft (211). The device base (1) is externally fixedly installed to a No. 3 motor (207), and a No. 3 gear (209) is rotatably connected to the outside of the device base (1). The No. 3 motor (207) is externally rotatably connected to a No. 2 gear (208), and the No. 2 gear (208) is meshed with the No. 1 gear (210), and the No. 2 gear (208) is meshed with the No. 3 gear (209).

3. A hydrogel coating device as claimed in claim 1, characterized in that: A gel coating box (314) is fixedly mounted on the outside of the device base (1); the gel fiber coating (315) is fixedly mounted on the outside of the fiber coating roll (2); the gel fiber coating (315) passes through the gel coating box (314); a filter device (311) is fixedly mounted on the outside of the gel coating box (314); a gel pipe (312) is fixedly mounted on the outside of the filter device (311); a gel spraying pump (313) is fixedly mounted on the outside of the gel pipe (312); and the gel pipe (312) is rotationally connected to the swing gear (316).

4. A hydrogel coating device as claimed in claim 1, characterized in that: A No. 1 fixed block (304) is fixedly mounted on the outside of the gel coating spraying device (3), a No. 1 motor (305) is fixedly mounted on the outside of the No. 1 fixed block (304), a No. 3 rotating shaft (306) is rotatably connected to the outside of the No. 1 motor (305), and the No. 3 rotating shaft (306) is fixedly connected to the No. 1 rotating disk (307).

5. A hydrogel coating device as claimed in claim 4, characterized in that: The No. 1 turntable (307) is externally rotatably connected to a No. 1 sliding rod (308), one end of the No. 1 sliding rod (308) away from the No. 1 turntable (307) is rotatably connected to the No. 1 sawtooth bar (309), the No. 1 sawtooth bar (309) is meshed with the swing gear (316), and the device base (1) is externally rotatably connected to a limited rotation block (310), the limited rotation block (310) is in contact with the No. 1 sawtooth bar (309).

6. A hydrogel coating device as claimed in claim 1, characterized in that: The device base (1) is externally slidably connected to a No. 2 fixed block (202), the No. 2 fixed block (202) is externally rotatably connected to an extrusion roller (201), the extrusion roller (201) is in contact with the gel fiber coating (315), the No. 2 fixed block (202) is externally fixedly installed with a No. 2 sliding rod (204), the No. 1 spring (203) is externally fixedly installed on the No. 2 fixed block (202), and one end of the No. 1 spring (203) away from the No. 2 fixed block (202) is fixedly connected to the No. 2 sliding rod (204).

7. A hydrogel coating device as claimed in claim 1, characterized in that: The gel coating spraying device (3) is rotatably connected to the outside of a gel spraying tube (302), a gel spraying port (303) is fixedly installed on the outside of the gel spraying tube (302), the gel spraying tube (302) is fixedly connected to the swing gear (316), and one end of the gel spraying tube (302) away from the swing gear (316) is rotatably connected to a limited fixed plate (301).

8. A hydrogel coating device as claimed in claim 1, characterized in that: A heating metal tube (406) is fixedly installed on the outside of the drying device (4), and a drying fan (401) is rotatably connected to the outside of the drying device (4). A No. 1 right-angle gear (402) is fixedly installed on the outside of the drying fan (401), and the No. 4 rotating shaft (404) rotates on the outside of the drying device (4).

9. A hydrogel coating device as claimed in claim 8, characterized in that: A second motor (405) is fixedly mounted on the outside of the fourth rotating shaft (404), and a second right-angle gear (403) is fixedly mounted on the outside of the fourth rotating shaft (404), and the second right-angle gear (403) is meshed with the first right-angle gear (402).

10. A method for using a hydrogel coating device as claimed in claims 1 to 9, characterized in that: The following steps are involved: Step 1: First, select a suitable hydrogel spraying liquid, such as polyvinyl alcohol or polyacrylamide, and use deionized water or other appropriate solvents to prepare a hydrogel solution. Add the selected hydrogel material into an appropriate amount of solvent, heat or stir until completely dissolved, and form a uniform hydrogel solution, which is then placed in the gel fiber coating (315); Step 2: Use the filter device (311) to remove bubbles and impurities to avoid blockage during the spraying process, and set the gel spray pump (313) to adjust the spraying pressure, nozzle diameter and coating speed to ensure uniform spraying and suitable for the required coating thickness, and test on a small area to confirm the spraying effect and material adhesion; Step 3: The hydrogel is uniformly sprayed on the surface of the substrate to be coated through the gel spray port (303). The spraying distance and angle can be controlled by the rotation of the swing gear (316) to ensure uniform coating. The fiber coating roll (2) and the transmission roller (206) are driven to rotate by the rotation of the second gear (208) so as to maintain a uniform speed to ensure a uniform coating thickness. Step 4: After spraying is completed, the curing of the hydrogel is accelerated by heating the heating metal tube (406) and air drying the air drying fan (401), and the squeezing roller (201) is used to roll and roll the hydrogel to make it smoother. During the spraying process, excess hydrogel automatically drips into the paint box for recycling to reduce waste.

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