Coating device and equipment for producing products with photocatalytic function

Abstract

The utility model belongs to the field of fabric production equipment, and specifically relates to a coating device and equipment for producing products with photocatalytic functions. The coating device is provided with an immersion tank, an introduction roller, a first roller group, a second roller group, a first immersion roller and a second immersion roller, wherein: the introduction roller is provided with at least three rollers for pressing against each other, which are used to discharge the air inside the base material before immersion to generate negative pressure; the first roller group and the second roller group are both provided with at least three rollers for pressing against each other, and the spacing between the rollers for pressing against each other in the first roller group is smaller than the spacing between the rollers in the second roller group, which are used to press the photocatalyst slurry onto the base material after being rolled by the first roller group and the second roller group; the first immersion roller and the second immersion roller are arranged at the bottom of the immersion tank. The coating device and equipment for producing products with photocatalytic functions provided by the utility model can make the photocatalyst material firmly combined with the base material, not easy to fall off and have a good photocatalytic effect.

Description

Technical Field

[0001] The utility model belongs to the field of fabric production equipment, and in particular relates to a coating device and equipment for producing products with photocatalytic function. Background Art

[0002] In recent years, there are often problems of excessive gaseous pollutants in confined spaces such as cars and indoors, mainly from decorative materials, building materials, furniture, household appliances, etc. Among them, the most harmful gaseous pollutants are mainly formaldehyde, benzene, ammonia, etc., which seriously affect human health. Traditional air purification technology is mainly physical adsorption, and the commonly used adsorption material is activated carbon. However, this method only adsorbs gaseous pollutants into the pores of activated carbon, and cannot completely eliminate pollutants. In addition, pollutants will be desorbed, causing secondary air pollution. In recent years, photocatalytic technology has mild reaction conditions and can react with gaseous pollutants at room temperature to generate water and carbon dioxide. It can not only achieve harmless degradation of gaseous pollutants but also does not consume photocatalysts. Therefore, it has received extensive attention and research in the field of air purification.

[0003] However, since photocatalysts are generally in powder form, direct use will cause dust pollution and is difficult to recycle. They need to be loaded on a macroscopic carrier to be widely used in the treatment of gas pollutants in vehicles and indoors. However, the current loading technology has the following problems: (1) The photocatalyst is easy to fall off after being loaded on the carrier; (2) The photocatalyst will cover the active sites on the surface of the photocatalyst during the loading process, reducing the photocatalytic performance; (3) The photocatalyst will generate waste gas and wastewater pollution during the loading process. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the loaded photocatalytic material in the existing equipment is easy to fall off, and to provide a coating device and a device for producing products with photocatalytic function including the coating device, which can load the photocatalytic material evenly and firmly on the base material and also has a good photocatalytic effect.

[0005] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0006] The utility model provides a coating device, which is used for dipping a photocatalyst into a base material. The coating device is provided with a dipping tank, an introduction roller, a first roller group, a second roller group, a first dipping roller and a second dipping roller, wherein: the introduction roller is provided with at least three opposing rollers, which are used for discharging the air inside the base material before dipping so as to generate negative pressure; the first roller group and the second roller group are both provided with at least three opposing rollers, and the spacing between the opposing rollers in the first roller group is smaller than the spacing between the opposing rollers in the second roller group, which are used for pressing the photocatalyst slurry onto the base material after being rolled by the first roller group and the second roller group; the first dipping roller and the second dipping roller are arranged at the bottom of the dipping tank, which are used for dipping the base material into the photocatalyst slurry.

[0007] In some embodiments of the present application, the rollers of the inlet rollers are arranged in two rows and the line connecting the center points of three adjacent rollers forms a triangle; the first roller group and the second roller group are arranged at the top of the immersion tank; the first roller group and the second roller group are each provided with an upper roller and a lower roller, the upper roller is adjustably arranged above the lower roller and the line connecting the center points of three adjacent rollers forms a triangle.

[0008] In some embodiments of the present application, the coating device is further provided with a guide roller for guiding out the substrate material after the photocatalyst loading is completed; the immersion tank is provided with a slurry inlet, a slurry outlet, a wastewater outlet, an agitator I and a liquid level measuring instrument, the agitator is arranged at the bottom of the immersion tank, and the slurry inlet is arranged above the slurry outlet.

[0009] In some embodiments of the present application, the coating device also includes a dosing device, which includes a dosing tank, an agitator II, a feeding pump and a storage tank; the dosing tank is provided with a first outlet, the agitator II is provided in the dosing tank, and is used to stir to obtain a photocatalyst slurry, and the storage tank is provided with a second inlet, a second outlet, and a third inlet; the first outlet of the dosing tank is communicated with the second inlet of the storage tank, the second outlet of the storage tank is communicated with the slurry inlet of the immersion tank, and the third inlet of the storage tank is communicated with the slurry outlet of the immersion tank; the feeding pump includes a first feeding pump, a second feeding pump and a third feeding pump, the first feeding pump is provided on a pipeline connecting the first outlet of the dosing tank and the second inlet of the storage tank, the second feeding pump is provided on a pipeline connecting the second outlet of the dosing tank and the slurry inlet of the immersion tank, and the third feeding pump is provided on a pipeline connecting the third inlet of the storage tank and the slurry outlet of the immersion tank.

[0010] In some embodiments of the present application, the batching tank is further provided with a first inlet, and the storage tank is further provided with a third outlet. The first inlet of the batching tank is connected to the third outlet of the storage tank, and a fourth feeding pump for conveying photocatalyst slurry is provided on the connecting pipeline.

[0011] In some embodiments of the present application, the height of the first inlet of the batching tank is greater than the height of the first outlet, and the heights of the second inlet and the third inlet of the storage tank are greater than the heights of the second outlet and the third outlet.

[0012] The utility model also provides a device for producing products with photocatalytic functions, which is used to load photocatalysts on base materials to obtain products with photocatalyst functions. The device includes a placing device, the above-mentioned coating device, a drying device, and a collecting device which are sequentially connected along the feeding direction of the base material.

[0013] In some embodiments of the present application, the cloth placing device is provided with a cloth placing machine; the drying device is provided with a dryer for drying and shaping the photocatalyst slurry on the base material by heating; and the cloth collecting device is provided with a fabric rolling machine.

[0014] In some embodiments of the present application, the production equipment also includes a waste gas treatment device and a wastewater treatment device; the waste gas treatment device includes an air collecting hood, a waste gas conveying pipeline, and a waste gas treatment reagent; the air collecting hood is arranged on the top of the coating device and the drying device to collect the generated waste gas, and the waste gas treatment reagent is arranged inside the waste gas conveying pipeline; the wastewater treatment device includes a wastewater storage tank, a flocculation tank, a plate and frame filter press, and a reverse osmosis water treatment device.

[0015] In some embodiments of the present application, the production equipment also includes a tension device and a cutting device; the tension device is arranged between the cloth placing device and the coating device; the tension device includes a fabric flattening table, a tension frame and a cloth counting device; the cutting device is used to cut the produced product with photocatalyst function.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the base material enters the coating device through the placing device, and before impregnation, the air inside the base material is first discharged through the introduction roller to generate negative pressure, the base material at the bottom of the impregnation tank is impregnated in the photocatalyst slurry through the action of the first impregnation roller, and then is rolled by the first roller group and then impregnated in the photocatalyst slurry again through the second impregnation roller, the base material after the second impregnation is rolled by the second roller group and then enters the drying device for drying, and then the prepared product is collected by the collection device. By setting the introduction roller, the base material is in a negative pressure state, which is more conducive to the combination of the photocatalyst material and the base material. Then, by setting the first roller group and the second roller group and the spacing between the pressing rollers in the first roller group is smaller than the spacing between the pressing rollers in the second roller group, the spacing of the first roller group is small, and the pressure on the base material is large, so that the photocatalyst slurry can be firmly combined with the inside and surface of the base material, solving the problem of easy falling of the photocatalyst slurry. The spacing of the second roller group is larger than that of the first roller group, which can increase the rolling rate of the photocatalyst slurry on the base material, so that the photocatalyst is more combined with the base material, increase the active sites after the photocatalyst material and the base material are combined, and improve the photocatalytic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0018] Figure 1 It is a schematic diagram of the structure of the coating device.

[0019] Figure 2 It is a schematic diagram of the structure of equipment for producing products with photocatalytic function.

[0020] The reference numerals are as follows: 1. cloth placing device; 2. tension device; 3. coating device; 4. drying device; 5. cloth collecting device; 6. cutting device; 7. waste gas treatment device; 8. waste water treatment device; 31. dipping tank; 32. introduction roller; 33. first roller group; 34. second roller group; 35. first cloth dipping roller; 36. second cloth dipping roller; 37. batching device; 38. lead-out roller; 311. slurry inlet; 312. slurry outlet; 313. agitator I; 314. waste water outlet; 315. liquid level measuring instrument; 371. batching tank; 3711. first inlet; 3712. first outlet; 372. agitator II; 37 3. Feed pump; 3731. First feed pump; 3732. Second feed pump; 3733. Third feed pump; 3734. Fourth feed pump; 374. Storage tank; 3741. Second inlet; 3742. Third inlet; 3743. Second outlet; 3744. Third outlet; 11. Cloth placing machine; 21. Fabric leveling table; 22. Fabric counter; 23. Tension rack; 41. Dryer; 51. Fabric rolling machine; 61. Cutter; 62. Cutter; 71. Gas collecting hood; 72. Waste gas conveying pipeline; 73. Waste gas treatment reagent; 81. Waste water storage tank; 82. Flocculation tank; 83. Plate and frame filter press; 84. Reverse osmosis water treatment device. DETAILED DESCRIPTION

[0021] Although the present invention can be easily expressed as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It can be understood that this description should be regarded as an exemplary description of the principles of the present invention, and is not intended to limit the present invention to that described herein.

[0022] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible device designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0023] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0024] See also Figure 1The coating device 3 provided in one embodiment of the utility model is provided with an immersion tank 31, an introduction roller 32, a first roller group 33, a second roller group 34, a first immersion roller 35 and a second immersion roller 36, which are used to immerse the photocatalyst into the base material, wherein: the introduction roller 32 is provided with at least three opposing rollers, which are used to discharge the air inside the base material before immersion to generate negative pressure; the first roller group 33 and the second roller group 34 are both provided with at least three opposing rollers, and the spacing between the opposing rollers in the first roller group 33 is smaller than the spacing between the opposing rollers in the second roller group 34, which is used to press the photocatalyst slurry onto the base material after being rolled by the first roller group 33 and the second roller group 34; the first immersion roller 35 and the second immersion roller 36 are arranged at the bottom of the immersion tank 31, and are used to immerse the base material in the photocatalyst slurry.

[0025] Through the above-mentioned structural design, before the base material is impregnated, the air inside the base material is first discharged through the introduction roller 32 to generate negative pressure. The base material at the bottom of the impregnation tank 31 is immersed in the photocatalyst slurry through the action of the first dipping roller 35, and then is rolled by the first roller group 33 and then immersed in the photocatalyst slurry again through the second dipping roller 36. After the second impregnation, the base material is rolled by the second roller group 34 to complete the impregnation. By setting the introduction roller 32, a negative pressure state is generated in the base material, which is more conducive to the combination of the photocatalyst material and the base material. Then, by setting the first roller group 33 and the second roller group 34 and the spacing between the pressing rollers in the first roller group 33 is smaller than the spacing between the pressing rollers in the second roller group 34, the spacing of the first roller group 33 is small, and the pressure applied to the base material is large, so that the photocatalyst slurry can be firmly combined with the inside and surface of the base material, solving the problem of easy falling off of the photocatalyst slurry. The spacing of the second roller group 34 is larger than that of the first roller group 33, which can increase the rolling rate of the photocatalyst slurry on the base material, so that the photocatalyst is more combined with the base material, increase the active sites after the photocatalyst material and the base material are combined, and improve the photocatalytic effect.

[0026] In the present invention, the substrate material can be any existing material for supporting photocatalysts, such as fiber felt, ceramic fiber cloth, sponge and other carrier materials with good softness, multiple pores and good plasticity. The photocatalyst slurry can be obtained by mixing any existing photocatalysts (such as graphene, metal oxides, etc.) with an adhesive and any other optional raw materials, and the adhesive can be any adhesive commonly used in the prior art, such as polyacrylic resin, inorganic silicate, etc.

[0027] See also Figure 2 In the embodiment, the rollers of the introduction rollers 32 are arranged in two rows and the center points of three adjacent rollers are connected to form a triangle. Specifically, Figure 2The guide roller 32 includes three rollers, and the center points of the three rollers are connected to form a triangle. Compared with the conventional setting of one guide roller or two guide rollers pressing against each other, the guide roller 32 provided by the utility model can squeeze the base material twice, generate higher pressure, and more effectively discharge the air in the base material, which is conducive to the subsequent loading of photocatalysts on the base material.

[0028] See also Figure 2 In the embodiment, the first roller group 33 and the second roller group 34 are arranged at the top of the immersion tank 31. Such a structure is conducive to the excess photocatalyst slurry after rolling to return to the immersion tank 31, thereby improving the utilization rate of the photocatalyst slurry. The first roller group 33 and the second roller group 34 are each provided with an upper roller and a lower roller, and the upper roller is adjustably arranged above the lower roller, and the center points of the three adjacent rollers are connected to form a triangle. By controlling the spacing between the upper roller and the lower roller, the loading amount and the rolling rate of the photocatalyst slurry on the base material can be better controlled. Compared with the conventional roller group composed of an upper and lower roller, the first roller group 33 and the second roller group 34 provided by the utility model can not only realize the firm combination of the photocatalyst slurry and the base material through multiple rolling, but also solve the problem that the photocatalyst slurry is unevenly combined with the base material and easy to fall off due to a single rolling, and at the same time, by controlling the spacing between the pressing rollers in the first roller group 33 to be smaller than the spacing between the pressing rollers in the second roller group 34, the photocatalyst after rolling can not only be evenly and firmly combined with the base material, but also can make the photocatalyst more combined with the base material, increase the active sites after the photocatalyst and the base material are combined, and improve the photocatalytic effect.

[0029] See also Figure 2 In the embodiment, the coating device 3 is further provided with a guide roller 38 for guiding out the substrate material after the photocatalyst loading is completed; the immersion tank 31 is provided with a slurry inlet 311, a slurry outlet 312, a wastewater outlet 314, an agitator I 313 and a liquid level measuring instrument 315, the agitator I 313 is arranged at the bottom of the immersion tank 31, and the slurry inlet 311 is arranged above the slurry outlet 312. The function of the agitator I 313 is to prevent the precipitation of the photocatalytic slurry in the immersion tank by stirring, thereby adversely affecting the process of loading the photocatalyst slurry onto the substrate material. The slurry inlet 311 is arranged above the slurry outlet 312, on the one hand, it can prevent the photocatalyst slurry from flowing back when entering the immersion tank 31, and on the other hand, it is convenient to recycle the remaining photocatalyst slurry. The liquid level measuring instrument 315 is used to adjust the liquid volume of the photocatalyst slurry in the immersion tank 31. When the photocatalyst slurry is input, the liquid level measuring instrument 315 controls the immersion tank 31 to reach a suitable loading liquid volume. When the loading liquid volume is insufficient, the photocatalyst slurry is replenished in time.

[0030] See also Figure 2In the embodiment, the coating device 3 also includes a batching device 37, and the batching device 37 includes a batching tank 371, an agitator II 372, a feeding pump 373 and a storage tank 374. The agitator II 372 is arranged in the batching tank 371, and is used to stir and mix the contents of the batching tank 371 to obtain a photocatalyst slurry. The batching tank 371 is provided with a first outlet 3712, and the storage tank 374 is provided with a second inlet 3741, a second outlet 3743, and a third inlet 3742. The first outlet 3712 of the batching tank 371 is connected to the second inlet 3741 of the storage tank 374, the second outlet 3743 of the storage tank 374 is connected to the slurry inlet 311 of the immersion tank 31, and the third inlet 3742 of the storage tank 374 is connected to the slurry outlet 312 of the immersion tank 31; the feeding pump 373 includes a first feeding pump 371; Pump 3731, a second feeding pump 3732 and a third feeding pump 3733, the first feeding pump 3731 is arranged on the pipeline connecting the first outlet 3712 of the mixing tank 371 and the second inlet 3741 of the storage tank 374, the second feeding pump 3732 is arranged on the pipeline connecting the second outlet 3743 and the slurry inlet 311 of the immersion tank 31, and the third feeding pump 3733 is arranged on the pipeline connecting the third inlet 3742 of the storage tank 374 and the slurry outlet 312 of the immersion tank 31. After the photocatalyst slurry is output from the first outlet 3712 of the mixing tank 371, it enters the storage tank 374 through the first feeding pump 3731 and the second inlet 3741, and is then transported through the second outlet 3743 and the second feeding pump 3732 and enters the immersion tank 31 through the slurry inlet 311; after the immersion is completed, the remaining photocatalyst slurry is output from the slurry outlet 312 and enters the storage tank 374 through the third feeding pump 3733 and the third inlet 3742, thereby completing the circulation process of the photocatalyst.

[0031] See also Figure 2 In the embodiment, the batching tank 371 is further provided with a first inlet 3711, and the storage tank 374 is further provided with a third outlet 3744. The first inlet 3711 of the batching tank 371 is connected to the third outlet 3744 of the storage tank 374, and the connecting pipeline is provided with a fourth feed pump 3734 for conveying the photocatalyst slurry. Through the above-mentioned structural arrangement, when the storage tank 374 needs to be repaired, the remaining photocatalyst slurry can be output from the third outlet 3744 and enter the batching tank through the fourth feed pump 3734 and the first inlet 3711. In addition, when the process of impregnating the substrate material with the photocatalyst is completed, clean water can be injected into the batching tank 371, and then through the design of the above-mentioned connecting pipeline and pump, the clean water can complete the cleaning of the batching tank 371, the storage tank 374 and the dipping tank 31, and the waste water generated after cleaning flows out through the waste water outlet 314 of the dipping tank 31.

[0032] See also Figure 2In the embodiment, the height of the first inlet 3711 of the mixing tank 371 is greater than the height of the first outlet 3712 , and the heights of the second inlet 3741 and the third inlet 3742 of the storage tank 374 are greater than the heights of the second outlet 3743 and the third outlet 3744 .

[0033] In addition, the storage tank 374 is also provided with a discharge port, and when the type of photocatalyst slurry needs to be changed or the remaining photocatalyst slurry needs to be discharged during cleaning / maintenance, the remaining photocatalyst slurry can be discharged through the discharge port.

[0034] See also Figure 1 An embodiment of the utility model provides an apparatus for producing a product with a photocatalytic function, comprising a placing device, a coating device having the above structure, a drying device, and a collecting device which are sequentially connected along the feeding direction of the substrate material.

[0035] See also Figure 1 In the embodiment, the cloth placing device 1 is provided with a cloth placing machine 11 for placing the base material. The drying device 4 is provided with a drying machine 41 for drying and shaping the photocatalyst slurry on the base material by heating. The heating temperature and time are not specifically limited and can be the conditions commonly used in the prior art. The cloth collecting device 5 is provided with a fabric rolling machine 51. After the base material loaded with the photocatalyst is dried and shaped by the drying machine 41, it enters the fabric rolling machine 51 for rolling and finishing.

[0036] See also Figure 1In the embodiment, the production equipment also includes a waste gas treatment device 7 and a waste water treatment device 8, which are used to treat the waste gas and waste water generated in the process of producing products with photocatalytic functions, so that the production process using the equipment is more environmentally friendly. The waste gas treatment device 7 includes a gas collecting hood 71, a waste gas conveying pipeline 72, and a waste gas treatment reagent 73. The gas collecting hood 71 is arranged on the top of the coating device 3 and the drying device 4, and is used to collect the generated waste gas. The waste gas treatment reagent 73 is arranged inside the waste gas conveying pipeline 72. The utility model does not specifically limit the type of waste gas treatment reagent 73, and it can be selected according to the actual waste gas treatment requirements. The waste water treatment device 8 includes a waste water storage tank 81, a flocculation tank 82, a plate and frame filter press 83, and a reverse osmosis water treatment device 84. The waste water storage tank 81 is used to centrally store the waste water generated in the production process, and after storing a certain amount, it enters the flocculation tank 82 for waste water treatment. The flocculation tank 82 uses a flocculant to flocculate and precipitate pollutants in the wastewater, and the supernatant enters the reverse osmosis water treatment device 84, and the precipitate enters the plate-frame filter press 83. The utility model does not specifically limit the flocculant used, and it can be various flocculants in the prior art. The plate-frame filter press 83 filters the precipitate after the wastewater flocculation to further form a filter cake and a filtrate. The supernatant generated by the flocculation tank 82 and the filtrate generated by the plate-frame filter press 83 enter the reverse osmosis water treatment device 84 for treatment, generating wastewater and reverse osmosis concentrated water that can be discharged, and the reverse osmosis concentrated water and filter cake are collected and sent to a professional environmental protection company for deep treatment.

[0037] See also Figure 1 In an embodiment, the production equipment may further include a tension device 2 and a cutting device 6. The tension device 2 is arranged between the cloth placing device 1 and the coating device 3. The tension device 2 includes a fabric flattening table 21, a tension frame 23 and a cloth counter 22. The tension frame 23 is used to increase the tension of the base material, so that the base material is flat and wrinkle-free, which is beneficial for evenly loading the photocatalyst slurry on the base material during the subsequent impregnation process. The pedometer 22 is installed above the tension frame 23 and is used to measure the amount of base material. The cutting device 6 is used to cut the produced product with photocatalyst function, and can be cut into any desired shape. The cutting device 6 includes a cutter 61, and the cutter 61 is provided with a cutting knife 62, and the spacing between the cutting knives 62 is adjustable.

[0038] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A coating device for impregnating a photocatalyst into a substrate material, characterized in that: The coating device is provided with an immersion tank, an introduction roller, a first roller group, a second roller group, a first immersion roller and a second immersion roller, wherein: the introduction roller is provided with at least three opposing rollers for discharging the air inside the base material before immersion to generate negative pressure; the first roller group and the second roller group are both provided with at least three opposing rollers, and the spacing between the opposing rollers in the first roller group is smaller than the spacing between the opposing rollers in the second roller group, for pressing the photocatalyst slurry onto the base material after being rolled by the first roller group and the second roller group; the first immersion roller and the second immersion roller are arranged at the bottom of the immersion tank, for immersing the base material in the photocatalyst slurry.

2. The coating device according to claim 1, characterized in that: The rollers of the introduction rollers are arranged in two rows and the center points of three adjacent rollers are connected to form a triangle; The first roller group and the second roller group are arranged at the top of the immersion tank. The first roller group and the second roller group are each provided with an upper roller and a lower roller. The upper roller is adjustably arranged above the lower roller and the center points of the three adjacent rollers are connected to form a triangle.

3. The coating device according to claim 1, characterized in that: The coating device is also provided with a lead-out roller for leading out the substrate material after the photocatalyst loading is completed; The immersion tank is provided with a slurry inlet, a slurry outlet, a wastewater outlet, a stirrer I and a liquid level measuring instrument. The stirrer is arranged at the bottom of the immersion tank, and the slurry inlet is arranged above the slurry outlet.

4. The coating device according to claim 3, characterized in that: The coating device also includes a batching device, which includes a batching tank, a stirrer II, a feed pump and a storage tank; The batching tank is provided with a first outlet, the stirrer II is provided in the batching tank for stirring to obtain the photocatalyst slurry, and the storage tank is provided with a second inlet, a second outlet, and a third inlet; The first outlet of the batching tank is communicated with the second inlet of the storage tank, the second outlet of the storage tank is communicated with the slurry inlet of the dipping tank, and the third inlet of the storage tank is communicated with the slurry outlet of the dipping tank; The feeding pump includes a first feeding pump, a second feeding pump and a third feeding pump. The first feeding pump is arranged on a pipeline connecting the first outlet of the mixing tank and the second inlet of the storage tank, the second feeding pump is arranged on a pipeline connecting the second outlet and the slurry inlet of the immersion tank, and the third feeding pump is arranged on a pipeline connecting the third inlet of the storage tank and the slurry outlet of the immersion tank.

5. The coating device according to claim 4, characterized in that: The batching tank is also provided with a first inlet, and the storage tank is also provided with a third outlet. The first inlet of the batching tank is connected with the third outlet of the storage tank, and a fourth feeding pump for conveying photocatalyst slurry is provided on the connecting pipeline.

6. The coating device according to claim 5, characterized in that: The height of the first inlet of the batching tank is greater than the height of the first outlet, and the heights of the second inlet and the third inlet of the storage tank are greater than the heights of the second outlet and the third outlet.

7. A device for producing a product with a photocatalytic function, used for loading a photocatalyst on a substrate material to obtain a product with a photocatalyst function, characterized in that: The device comprises a cloth placing device, a coating device according to any one of claims 1 to 6, a drying device and a cloth collecting device which are sequentially connected along the feeding direction of the base material.

8. The device for producing a product with photocatalytic function according to claim 7, characterized in that: The cloth placing device is provided with a cloth placing machine; the drying device is provided with a drying machine for drying and shaping the photocatalyst slurry on the base material by heating; the cloth collecting device is provided with a fabric rolling machine.

9. The device for producing a product with photocatalytic function according to claim 7 or 8, characterized in that: The production equipment also includes a waste gas treatment device and a waste water treatment device; The exhaust gas treatment device includes an air collecting hood, an exhaust gas delivery pipeline, and an exhaust gas treatment reagent. The air collecting hood is arranged on the top of the coating device and the drying device to collect the generated exhaust gas, and the exhaust gas treatment reagent is arranged inside the exhaust gas delivery pipeline; The wastewater treatment device comprises a wastewater storage tank, a flocculation tank, a plate and frame filter press, and a reverse osmosis water treatment device.

10. The device for producing a product with photocatalytic function according to claim 9, characterized in that: The production equipment also includes a tension device and a cutting device; The tension device is arranged between the cloth placing device and the coating device, and the tension device comprises a fabric flattening table, a tension frame and a cloth counting device; The cutting device is used to cut the produced product with photocatalyst function.

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