Coating device and method for water-based ribbon production

Abstract

The invention relates to the technical field of textile printing and dyeing and deep processing of belt fabrics, in particular to a coating device and method for water-based silk ribbon production, and the device comprises a rack, a tensioning assembly and a coating assembly; the coating assembly comprises a rolling cylinder and a brush head sliding in a reciprocating mode. A fluid self-oscillation mechanism is constructed in the brush head, the self-oscillation valve element in the liquid inlet cavity reciprocates under the synergistic effect of liquid supply pressure and the reset spring and impacts the cavity wall, the brush head is driven to generate mechanical vibration, and the thixotropic viscosity of water-based paint is reduced through dynamic shearing so as to improve the leveling property. Meanwhile, a backflow assembly is arranged at the end of the coating stroke, a piston pumping mechanism is driven through mechanical impact kinetic energy generated when the brush head moves to the tail end, collected edge waste liquid is automatically and forcibly injected into a brush head liquid storage cavity, and homogenization of the waste liquid and fresh coating is achieved through vibration of the brush head.

Description

Technical Field

[0001] This invention relates to the field of textile printing and dyeing technology and deep processing technology of ribbon fabrics, and in particular to a coating device and method for producing water-based ribbons. Background Technology

[0002] In the production of textile ribbons (base fabrics) such as label tapes, care labels, and gift ribbons, a functional coating is usually applied to the base fabric surface to improve its smoothness, whiteness, and subsequent printing clarity. With increasingly stringent environmental regulations, traditional solvent-based (oil-based) coatings, due to their content of volatile organic compounds (VOCs), are gradually being replaced by water-based coatings (such as water-based polyurethane and acrylic emulsions).

[0003] However, compared to solvent-based coatings, water-based coatings present the following significant technical challenges in actual coating processes, which existing coating equipment struggles to effectively address: Water-based coatings typically exhibit strong thixotropy (i.e., high viscosity at rest, decreasing viscosity under shear) and are highly volatile. Existing coating devices usually employ either a "slurry dipping + doctor blade" or "static brush" method for application. Because the shearing effect of a static brush on the coating is extremely limited, the static brush head cannot provide sufficient shear to fully "liquefy" and level the high-viscosity water-based coating, resulting in brush marks on the coating surface. Furthermore, the waste liquid overflowing to the edges often has a significantly higher viscosity and concentration than the fresh coating in the storage chamber due to water evaporation. Existing coating devices lack an internal dynamic mixing mechanism, leading to uneven local concentrations of the coating within the chamber and resulting in inconsistent coating thickness on the base fabric surface. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a coating apparatus and method for the production of water-based ribbons, which can improve the leveling properties of water-based coatings by using mechanical action and can automatically complete edge waste recycling and homogenization treatment.

[0005] To achieve the above objectives, the present invention provides a coating apparatus for the production of water-based ribbons, comprising a frame, a tensioning assembly mounted on the frame, and a coating assembly, characterized in that: The coating assembly includes a coating guide frame, a roller cylinder rotatably mounted on the frame, and a brush head that slides back and forth along the coating guide frame; The brush head has a liquid storage chamber inside, and a liquid inlet chamber is connected to the top of the liquid storage chamber. A self-vibrating valve core is movably arranged in the liquid inlet chamber along the axial direction. A lateral liquid outlet communicating with the liquid storage chamber is opened on the side wall of the liquid inlet chamber. A return spring is arranged between the self-vibrating valve core and the bottom of the liquid inlet chamber. Under the action of external liquid supply pressure, the self-vibrating valve core overcomes the elastic force of the return spring and moves back and forth along the axial direction of the liquid inlet chamber. During the reciprocating process, it periodically opens or closes the lateral liquid outlet. The self-vibrating valve core also impacts the cavity wall of the liquid inlet chamber at the end of the reciprocating stroke, thereby transmitting mechanical vibration to the brush head. The coating guide frame is provided with a return component at the end of its stroke. The return component includes a piston pumping mechanism that is provided corresponding to the reciprocating sliding path of the brush head. When the brush head moves to the end of its stroke, it contacts the piston pumping mechanism and drives it to produce a pumping action to inject the collected edge waste liquid into the liquid storage chamber. The liquid storage chamber is used to mix the injected edge waste liquid with the fresh paint entering the liquid storage chamber under the mechanical vibration transmitted by the self-vibrating valve core.

[0006] Furthermore, the top inner wall of the liquid inlet chamber is provided with a top impact step, and the bottom of the liquid inlet chamber is provided with a bottom impact step. The self-oscillating valve core impacts the top impact step and the bottom impact step respectively at the upper and lower stroke ends of the reciprocating motion. The bottom of the liquid inlet chamber is sealed with a bottom plug, the first reset spring is located on the top of the bottom plug, and the bottom of the self-oscillating valve core abuts against the top of the first reset spring.

[0007] Furthermore, the cross-sectional area of ​​the liquid inlet chamber is smaller than the cross-sectional area of ​​the external liquid inlet pipe connected to it, so as to form a throttling structure at the liquid inlet position; The bottom of the liquid storage chamber is uniformly provided with multiple sets of liquid outlet holes, which are used to allow the mixed coating liquid to seep out onto the bristles at the bottom of the brush head.

[0008] Furthermore, the recirculation assembly includes a sliding plate slidably disposed within the coating guide frame, and a cylinder body with a piston cylinder fixedly connected to the sliding plate, the cylinder body moving with the sliding plate within the coating guide frame; A piston body is slidably fitted inside the cylinder. The piston body is connected to an outwardly extending plug rod. The end of the plug rod is connected to a base. A return spring is connected between the base and the end of the cylinder. When the brush head reciprocates to the end of its stroke, it contacts the cylinder and pushes the cylinder to move relative to the piston body, thereby compressing the return spring to complete the pumping stroke.

[0009] Furthermore, the bottom of the cylinder is provided with a liquid inlet, and a one-way valve is installed in the liquid inlet. The liquid inlet end of the one-way valve is connected to a suction pipe, and its liquid outlet end is connected to the inner cavity of the cylinder. The cylinder is provided with a liquid outlet on the side near the brush head. A one-way valve is installed inside the liquid outlet. The inlet end of the one-way valve is connected to the inner cavity of the cylinder, and its outlet end faces the brush head. When the cylinder is pushed by the brush head, the liquid inside the cylinder is discharged into the liquid storage chamber of the brush head through the second one-way valve. When the brush head moves in the opposite direction, the cylinder is reset by the action of the second return spring and is sucked in through the first one-way valve.

[0010] Furthermore, sliding arms are symmetrically slidably arranged on both sides of the coating guide frame; The bottom of the sliding arm is provided with a scraper close to the outer edge of the rolling cylinder, and a recycling box is fixedly provided below the scraper. The end of the suction tube extends into the bottom of the inner cavity of the recycling box to suction the edge waste liquid collected inside the recycling box.

[0011] Furthermore, a smoothing plate is fixedly provided on the side of the sliding arm near the base fabric, and the smoothing plate extends horizontally and covers the edge of the base fabric.

[0012] Furthermore, it also includes a drive assembly for driving the brush head to reciprocate, the drive assembly including a lead screw rotatably disposed within the coating guide frame and a guide rod; A drive block is fixedly connected to the top of the brush head, and the drive block is threadedly engaged with the lead screw and slidably sleeved on the optical rod. A drive motor is installed at the top of the coating guide frame, and the output shaft of the drive motor is connected to the lead screw through a gear transmission structure.

[0013] Furthermore, the coating assembly also includes lifting columns disposed on both sides of the frame, and guide blocks are slidably disposed inside the lifting columns. The two ends of the coating guide frame and the roller are respectively connected to the guide blocks on both sides. The lifting column is equipped with a hydraulic rod, which is used to drive the rolling cylinder to rise and fall relative to the support roller located below it, so as to achieve pressing or separation.

[0014] A coating method for water-based ribbons using a coating apparatus for producing water-based ribbons includes the following steps: S1. Tension the base fabric and guide it between the rolling cylinder and the support roller; S2. Continuously supply water-based paint to the inlet chamber of the brush head, causing the self-vibrating valve core to reciprocate along the inlet chamber under the action of the supply pressure, and transmitting mechanical vibration to the brush head; S3. Drive the brush head to move back and forth along the coating guide frame so that the brush head can evenly coat the mixed coating onto the surface of the base fabric. S4. When the brush head moves to the end of its stroke, the piston pumping mechanism in the return assembly is pushed by the brush head to inject the collected waste liquid from the edge of the base fabric into the liquid storage chamber of the brush head. S5. In the brush head liquid storage chamber, the mechanical vibration transmitted by the self-vibrating valve core is used to mix the injected edge waste liquid with the fresh paint and then reuse it for coating.

[0015] The beneficial effects of this invention are as follows: By setting a self-vibrating valve core inside the brush head, mechanical micro-vibration is generated by the liquid supply pressure. On the one hand, this reduces the thixotropic viscosity of water-based coatings to eliminate brush marks and improve leveling. On the other hand, this vibration is used as a hybrid power to instantly vibrate and homogenize the high-viscosity edge waste liquid recovered by the return component with fresh coatings, effectively solving the problems of uneven coating concentration and coating thickness differences caused by the lack of an internal dynamic mixing mechanism in existing devices. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the tensioning component structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the main structure of the tensioning component according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the overall structure of the coating assembly according to an embodiment of the present invention; Figure 5 Embodiments of the present invention Figure 4 A magnified structural diagram of A in the middle; Figure 6 This is a schematic diagram of the internal structure of the brush head according to an embodiment of the present invention; Figure 7 Embodiments of the present invention Figure 6 A magnified structural diagram of B in the diagram; Figure 8 This is a schematic diagram of the driving component structure according to an embodiment of the present invention; Figure 9 Embodiments of the present invention Figure 8 A magnified structural diagram of C; Figure 10 This is a schematic diagram of the overall structure of the liquid return assembly according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the internal structure of the cylinder according to an embodiment of the present invention; Figure 12 This is a side view of the internal structure of the scraper rod according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the internal structure of the scraper rod according to an embodiment of the present invention.

[0018] The diagram is marked as follows: 1. Frame; 2. Tensioning assembly; 21. Guide roller one; 22. Guide roller two; 23. Elastic guide roller; 231. Slide groove; 232. Slide rod; 233. Tensioning spring; 234. Slider; 24. Guide roller three; 25. Support roller; 26. Base fabric; 3. Coating assembly; 31. Lifting column; 311. Limiting frame; 312. Hydraulic rod; 313. Guide block; 32. Coating guide frame; 321. Drive block; 322. Ear plate; 323. Smooth rod; 324. Lead screw; 325. Driven gear; 326. Mounting frame; 327. Drive motor; 328. Drive gear; 33. Roller cylinder; 34. Brush head; 341. Liquid storage box; 342. Brush bristles; 343. Liquid inlet. 344. Liquid storage chamber; 346. Return pipe; 35. Self-vibrating valve core; 351. Liquid inlet chamber; 352. Bottom plug; 353. Return spring one; 354. Side outlet; 355. Bottom impact step; 356. Top impact step; 4. Sliding arm; 41. Smoothing plate; 42. Scraper; 43. Recovery box; 5. Return assembly; 51. Sliding plate; 511. Hanging plate; 52. Piston cylinder; 521. Cylinder body; 522. Piston body; 523. Plug rod; 5231. Base; 524. Return spring two; 525. Liquid inlet; 526. One-way valve one; 527. Liquid outlet; 528. One-way valve two; 53. Suction pipe; 6. Unwinding device; 7. Pre-tensioning device. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7, Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 As shown, a coating apparatus for producing water-based ribbons includes a frame 1. A tensioning assembly 2 for maintaining the tension of the base fabric is provided in the middle of the frame 1, and a coating assembly 3 for coating operations is provided at the top.

[0022] The tensioning assembly 2 includes a first guide roller 21, a second guide roller 22, and a third guide roller 24. An elastic guide roller 23 is positioned between the second guide roller 22 and the third guide roller 24. The two ends of the elastic guide roller 23 are slidably mounted on slide rods 232 within vertical grooves 231 on the side wall of the frame 1 via sliders 234. Tension springs 233 are fitted onto the slide rods 232, which constantly press downwards against the sliders 234, causing the elastic guide roller 23 to press down on the base fabric, thereby buffering the vibration of the base fabric during transport and ensuring coating smoothness.

[0023] The coating assembly 3 is installed on top of the frame 1 and includes a lifting column 31. The lifting column 31 includes a limiting frame 311 connected to the frame 1. A hydraulic rod 312 is fixed to the top of the limiting frame 311. A guide block 313 is slidably arranged in the slide inside the limiting frame 311. The top of the guide block 313 is connected to the movable end of the hydraulic rod 312 and can be driven to lift by the hydraulic rod 312.

[0024] By controlling the extension and retraction stroke of the hydraulic rod 32, the pressing height between the coating component 3 and the base fabric 26 can be adjusted, thereby adapting to base fabric products with different thicknesses or different process requirements, and raising the coating component in the non-working state to avoid contact with the base fabric.

[0025] The brush head 34 has a liquid storage chamber 344 inside, and several liquid outlet micro-holes are opened at the bottom of the liquid storage chamber 344. The bristles 342 are evenly embedded around the liquid outlet micro-holes. The top of the liquid storage chamber 344 is connected to a liquid inlet chamber 351, and the liquid inlet pipe 343 is connected to the top of the liquid inlet chamber 351. An external liquid supply device pumps the coating liquid into the liquid inlet chamber 351 through the liquid inlet pipe 343. A self-oscillating valve core 35 is installed in the liquid inlet chamber 351. The valve core is cylindrical and can slide up and down in the chamber. The bottom of the liquid inlet chamber 351 is screwed into a bottom plug 352, and a return spring 353 is placed on the bottom plug 352. The top of the return spring 353 abuts against the bottom of the self-oscillating valve core 35. A lateral liquid outlet 354 is opened on the side wall of the liquid inlet chamber 351, which is connected to the liquid storage chamber 344 below.

[0026] To ensure that self-excited oscillation can continue, the cross-sectional area of ​​the inlet at the top of the inlet chamber 351 is designed to be smaller than the cross-sectional area of ​​the side outlet 354 when it is fully open. Working principle: When the high-pressure coating enters the inlet chamber 351, the fluid pressure overcomes the elastic force of the return spring 353, pushing the self-oscillating valve core 35 downward. After moving downward a certain distance, the side wall of the valve core opens, the lateral outlet 354 is opened, and the coating instantly leaks into the storage chamber 344, causing a sudden drop in pressure within the inlet chamber 351. At this time, the return spring 353 quickly rebounds, pushing the valve core back to its high position and sealing the lateral outlet 354 again.

[0027] This cycle repeats continuously, with the self-vibrating valve core 35 moving up and down within the cavity. To enhance the vibration, the top and bottom of the liquid inlet chamber 351 are respectively equipped with a top impact step 356 and a bottom impact step 355. Each time the valve core reverses direction, it impacts the steps, and the resulting mechanical vibration is directly transmitted to the brush head 34 and bristles 342. This micro-vibration effectively disrupts the thixotropic structure of the water-based coating, resulting in the lowest viscosity and excellent leveling effect when it contacts the roller cylinder 33.

[0028] At the left and right ends of the coating guide frame 32, return components 5 are integrated respectively. Each return component 5 includes a sliding plate 51 that is slidably suspended on the guide rod 323 via a mounting plate 511. Below the sliding plate 51, a piston cylinder 521 is fixed. Inside the cylinder 521 is a piston body 522, and a stopper rod 523 is connected to the piston body 522. The other end of the stopper rod 523 is connected to a base 5231. The base 5231 abuts against the end plate of the coating guide frame 32. A return spring 524 is installed between the end of the cylinder 521 and the base 5231.

[0029] The liquid outlet 527 on the side of the cylinder 521 has a conical structure and is fitted with an elastic sealing ring on its outer circumference; a return pipe 346 that mates with the liquid outlet 527 is provided on the side wall of the brush head 34. The return pipe 346 is provided with a normally closed elastic valve, and the other end of the return pipe 346 is connected to the liquid storage chamber 344; when the brush head 34 pushes the cylinder 521, the conical liquid outlet 527 is inserted into the return pipe 346 and pushes open the elastic valve inside, so as to realize the pipeline connection; The bottom of the cylinder 521 has an inlet 525, which contains a one-way valve 526 that allows liquid to enter but not exit, and is connected to a suction pipe 53. The side of the cylinder 521 has an outlet 527, which contains a one-way valve 528 that allows liquid to exit but not enter, with the outlet facing the brush head 34.

[0030] When the brush head 34 moves to the leftmost or rightmost end, its outer shell directly abuts against and pushes the cylinder 521 to move. Since the piston 522 is relatively fixed in position due to the obstruction of the base 5231, the cylinder 521 shifts relative to the piston 522, compressing the second return spring 524. At this time, the space inside the cylinder 521 decreases, and the liquid is forced into the liquid storage chamber 344 of the brush head 34 via the second check valve 528. When the brush head 34 moves away in the opposite direction, the second return spring 524 resets, the cylinder 521 draws in air, generating negative pressure, and waste liquid is drawn from the lower recovery box 43 through the first check valve 526.

[0031] The coating guide frame 32 is also slidably connected to two sides with adjustable sliding arms 4. In use, the sliding arms 4 are locked at the corresponding positions at both ends of the roller 33 according to the width of the base fabric. A flat plate 41 is fixed to the lower end of the sliding arm 4 to press down the edge of the base fabric to prevent it from curling. A scraper 42 is also provided to scrape off excess coating from the edge of the roller 33. The scraped coating falls into the recycling box 43 below, which is then drawn in by the return component 5. The returned coating is fully mixed with the new coating in the liquid storage chamber 344 under the vibration of the self-vibrating valve core 35 and then participates in the coating again, realizing the recycling of coating.

[0032] A water-based ribbon coating method based on the above-mentioned device includes the following steps: S1. Tension the base fabric and guide it between the rolling cylinder 33 and the support roller 25; S2. Water-based paint is continuously supplied to the liquid inlet chamber 351 of the brush head 34, causing the self-vibrating valve core 35 to reciprocate within the liquid inlet chamber 351 under the liquid supply pressure, and transmitting mechanical vibration to the brush head 34. S3. Drive the brush head 34 to move back and forth along the coating guide frame 32 so that the brush head 34 can evenly coat the mixed coating onto the surface of the base fabric. S4. When the brush head 34 moves to the end of its stroke, the piston pumping mechanism in the return assembly 5 is pushed by the brush head 34 to inject the collected waste liquid from the edge of the base fabric into the liquid storage chamber 344 of the brush head 34. S5. In the liquid storage chamber 344 of the brush head 34, the mechanical vibration transmitted by the self-vibrating valve core 35 is used to mix the injected edge waste liquid with the fresh paint and then use it for coating again.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0034] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A coating apparatus for producing water-based ribbons, comprising a frame (1), a tensioning assembly (2) mounted on the frame (1), and a coating assembly (3), characterized in that: The coating assembly (3) includes a coating guide frame (32), a roller (33) rotatably mounted on the frame (1), and a brush head (34) that slides back and forth along the coating guide frame (32). The brush head (34) has a liquid storage chamber (344) inside. The top of the liquid storage chamber (344) is connected to a liquid inlet chamber (351). A self-oscillating valve core (35) is movably arranged in the liquid inlet chamber (351) along the axial direction. A lateral liquid outlet (354) communicating with the liquid storage chamber (344) is opened on the side wall of the liquid inlet chamber (351). A reset spring (353) is arranged between the self-oscillating valve core (35) and the bottom of the liquid inlet chamber (351). The self-oscillating valve core (35) overcomes the elastic force of the return spring (353) under the action of external liquid supply pressure and moves back and forth along the axial direction of the liquid inlet chamber (351). During the reciprocating process, it periodically opens or closes the lateral liquid outlet (354). The self-oscillating valve core (35) collides with the cavity wall of the liquid inlet chamber (351) at the end of the reciprocating stroke, thereby transmitting mechanical vibration to the brush head (34). The coating guide frame (32) is provided with a return component (5) at the end of its stroke. The return component (5) includes a piston pumping mechanism that corresponds to the reciprocating sliding path of the brush head (34). When the brush head (34) moves to the end of its stroke, it contacts the piston pumping mechanism and drives it to generate a pumping action to inject the collected edge waste liquid into the liquid storage chamber (344). The liquid storage chamber (344) is used to mix the injected edge waste liquid with the fresh paint entering the liquid storage chamber (344) under the mechanical vibration transmitted by the self-vibrating valve core (35).

2. The coating apparatus for producing water-based ribbons according to claim 1, characterized in that, The top inner wall of the liquid inlet chamber (351) is provided with a top impact step (356), and the bottom of the liquid inlet chamber (351) is provided with a bottom impact step (355). The self-vibrating valve core (35) impacts the top impact step (356) and the bottom impact step (355) respectively at the upper and lower stroke ends of the reciprocating motion. The bottom of the liquid inlet chamber (351) is sealed with a bottom plug (352), the first reset spring (353) is located on the top of the bottom plug (352), and the bottom of the self-oscillating valve core (35) abuts against the top of the first reset spring (353).

3. The coating apparatus for producing water-based ribbons according to claim 1, characterized in that, The inlet cross-sectional area of ​​the inlet chamber (351) is smaller than the cross-sectional area of ​​the external inlet pipe (343) connected to it, so as to form a throttling structure at the inlet position; The bottom of the liquid storage chamber (344) is uniformly provided with multiple sets of liquid outlet holes, which are used to allow the mixed coating liquid to seep out onto the bristles (342) at the bottom of the brush head (34).

4. The coating apparatus for producing water-based ribbons according to claim 1, characterized in that, The reflux assembly (5) includes a sliding plate (51) slidably disposed in the coating guide frame (32), and a cylinder (521) of a piston cylinder (52) is fixedly connected to the sliding plate (51). The cylinder (521) moves with the sliding plate (51) in the coating guide frame (32). A piston body (522) is slidably fitted inside the cylinder (521). The piston body (522) is connected to an outwardly extending plug rod (523). The end of the plug rod (523) is connected to a base (5231). A return spring (524) is connected between the base (5231) and the end of the cylinder (521). When the brush head (34) reciprocates to the end of its stroke, it contacts the cylinder (521) and pushes the cylinder (521) to move relative to the piston (522) to compress the second return spring (524) to complete the pumping stroke.

5. The coating apparatus for producing water-based ribbons according to claim 4, characterized in that, The bottom of the cylinder (521) is provided with a liquid inlet (525), and a one-way valve (526) is installed in the liquid inlet (525). The liquid inlet end of the one-way valve (526) is connected to a suction pipe (53), and its liquid outlet end is connected to the inner cavity of the cylinder (521). The cylinder (521) is provided with a liquid outlet (527) on the side near the brush head (34). A one-way valve (528) is installed inside the liquid outlet (527). The liquid inlet of the one-way valve (528) is connected to the inner cavity of the cylinder (521), and its liquid outlet is facing the brush head (34). When the cylinder (521) is pushed by the brush head (34), the liquid inside the cylinder (521) is discharged into the liquid storage chamber (344) of the brush head (34) through the second one-way valve (528). When the brush head (34) moves in the opposite direction, the cylinder (521) is reset under the action of the second return spring (524) and is sucked through the first one-way valve (526).

6. The coating apparatus for producing water-based ribbons according to claim 5, characterized in that, The coating guide frame (32) is symmetrically and slidably provided with sliding arms (4) on both sides. The bottom of the sliding arm (4) is provided with a scraper (42) close to the outer edge of the rolling cylinder (33), and a recycling box (43) is fixedly provided below the scraper (42). The end of the suction tube (53) extends into the bottom of the inner cavity of the recycling box (43) to suction the edge waste liquid collected in the recycling box (43).

7. The coating apparatus for producing water-based ribbons according to claim 6, characterized in that, The sliding arm (4) is fixedly provided with a flat plate (41) on the side near the base fabric. The flat plate (41) extends horizontally and covers the edge of the base fabric.

8. The coating apparatus for producing water-based ribbons according to claim 1, characterized in that, It also includes a drive assembly for driving the brush head (34) to reciprocate, the drive assembly including a lead screw (324) rotatably disposed in the coating guide frame (32) and a guide rod (323). The top of the brush head (34) is fixedly connected to a drive block (321), which is threadedly engaged with the lead screw (324) and slidably sleeved on the guide rod (323). The top of the coating guide frame (32) is provided with a drive motor (327), and the output shaft of the drive motor (327) is connected to the lead screw (324) through a gear transmission structure.

9. The coating apparatus for producing water-based ribbons according to claim 1, characterized in that, The coating assembly (3) also includes lifting columns (31) arranged on both sides of the frame (1), and guide blocks (313) are slidably arranged in the lifting columns (31). The two ends of the coating guide frame (32) and the roller (33) are respectively connected to the guide blocks (313) on both sides. The lifting column (31) is provided with a hydraulic rod (312), which is used to drive the rolling cylinder (33) to rise and fall relative to the support roller (25) below it, so as to achieve pressing or separation.

10. A water-based ribbon coating method based on the coating apparatus for producing water-based ribbons according to any one of claims 1–9. Its features are, Includes the following steps: S1. Tension the base fabric and guide it between the rolling cylinder (33) and the support roller (25); S2. Water-based paint is continuously supplied to the liquid inlet chamber (351) of the brush head (34), causing the self-vibrating valve core (35) to reciprocate within the liquid inlet chamber (351) under the action of the liquid supply pressure, and transmitting mechanical vibration to the brush head (34). S3. Drive the brush head (34) to move back and forth along the coating guide frame (32) so that the brush head (34) can evenly coat the mixed coating onto the surface of the base fabric. S4. When the brush head (34) moves to the end of the stroke, the piston pumping mechanism in the return assembly (5) is pushed by the brush head (34) to inject the collected waste liquid at the edge of the base fabric into the liquid storage chamber (344) of the brush head (34). S5. In the liquid storage chamber (344) of the brush head (34), the mechanical vibration transmitted by the self-vibrating valve core (35) is used to mix the injected edge waste liquid with the fresh paint and then use it for coating again.

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