Double-sided coating device

Abstract

The utility model discloses a double-sided coating device, and belongs to the technical field of water electrolysis experiments. The double-sided coating device comprises a fixed support, a stretching assembly, a film scraping assembly and a driving assembly, a base material is fixed and stretched through the stretching assembly so that the base material can be kept flat, and the driving assembly drives the film scraping assembly to move in the extending direction of the base material so as to conduct double-sided coating on the base material. The uniformity and the pore structure consistency of the composite diaphragm can be effectively improved through double-sided coating, the overall performance of the diaphragm is further improved, the double-sided coating composite diaphragm prepared through the double-sided coating device can be close to a composite diaphragm prepared through industrial coating equipment, and it is ensured that a test result in an experiment can be reproduced in industrial production.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic water experiment technical field, in particular to a double -sided coating device. BACKGROUND

[0002] With the development of technology, hydrogen energy has become the consensus of global energy low carbon clean development, and electrolytic water hydrogen production is a common industrial production method of hydrogen energy, and the principle of electrolytic water hydrogen production is to use the electrolysis mode to decompose water into hydrogen and oxygen.

[0003] The electrolytic water hydrogen production equipment is mainly composed of an electrolytic tank, a power supply, a gas separation and collection system and the like. In this process, electrons flow out from the negative electrode of the power supply and are captured by hydrogen ions in water to generate hydrogen gas. At the same time, at one end of the positive electrode of the power supply, hydroxyl ions lose electrons to generate oxygen and water. The main components of the electrolytic tank include electrode plates and porous diaphragms. The electrode plates are used to conduct current and catalyze water electrolysis reaction, and the porous diaphragm is used to separate the cathode and anode of the electrode plate to prevent the mixture of hydrogen and oxygen generated during the electrolysis of water, and also allows electrolyte ions to pass through. The porous diaphragm usually uses a composite diaphragm, which is usually composed of a base material for mechanical support and a high molecular polymer coating for gas isolation and ion transmission.

[0004] In the research process of the composite diaphragm, the material and structure of the porous diaphragm are usually optimized by experimental methods. In the experimental process, the high molecular polymer casting solution is scraped on the base material by using a double-sided coating process, which can effectively improve the uniformity and pore structure consistency of the composite diaphragm, and further improve the accuracy of the experimental results. Therefore, there is an urgent need for a double-sided coating device for laboratory to improve the accuracy of experimental data on composite diaphragm. UTILITY MODEL CONTENTS

[0005] The utility model embodiment provides a double -sided coating device. It can solve the problem of the prior art that an urgent need exists for a double -sided coating device for laboratory to improve the accuracy of experimental data on composite diaphragm, and the technical scheme is as follows:

[0006] The double -sided coating device comprises a fixed support, a stretching assembly, a membrane scraping assembly and a driving assembly.

[0007] The stretching assembly is installed on the fixed support and is used to fix and stretch the base material.

[0008] The membrane scraping assembly has a containing groove and a strip-shaped gap at the groove bottom of the containing groove, the containing groove is used to contain the casting solution, and the base material is arranged in the strip-shaped gap.

[0009] The driving assembly is fixedly connected with the membrane scraping assembly and is used to drive the membrane scraping assembly to move along the extension direction of the base material.

[0010] Optionally, the stretching assembly comprises two clamping structures arranged oppositely.

[0011] The two clamping structures are respectively arranged at two ends of the base material and clamp edge portions of the base material.

[0012] The two clamping structures are movably connected with the fixing support.

[0013] Optionally, the clamping structure comprises an adjusting portion and two clamping plate portions arranged oppositely.

[0014] The two clamping plate portions are connected with the adjusting portion, and the adjusting portion is used for adjusting a distance between the two clamping plate portions.

[0015] Optionally, the fixing support comprises a fixing base, a supporting rod and two mounting portions.

[0016] The supporting rod is fixedly installed on the fixing base.

[0017] The two mounting portions are arranged along a length direction of the supporting rod and are movably connected with the supporting rod, and the two mounting portions are respectively movably connected with the two clamping structures.

[0018] Optionally, the mounting portion comprises a cross-shaped clamp and a connecting rod.

[0019] The cross-shaped clamp is connected with the supporting rod and the connecting rod respectively.

[0020] An end of the connecting rod, which is away from the cross-shaped clamp, is connected with the clamping structure.

[0021] Optionally, the film scraping assembly comprises two scraping knives arranged oppositely and two fixing clamps arranged oppositely.

[0022] The two scraping knives are respectively arranged at two sides of the base material, any one of the scraping knives has an acute included angle with the base material, and the two scraping knives enclose the accommodating groove and the strip-shaped gap.

[0023] The two fixing clamps are respectively arranged at two ends of the two scraping knives, any one of the fixing clamps is respectively connected with end portions of the two scraping knives, and the fixing clamps are connected with the driving assembly.

[0024] Optionally, the fixing clamp comprises a right-angle fixing clamp or an angle-adjustable clamp.

[0025] Optionally, an end portion of the scraping knife, which is close to the base material, has a semicircular cross section, a right-angle trapezoidal cross section or a right-angle triangular cross section.

[0026] Optionally, the driving assembly comprises a telescopic mechanism, the telescopic mechanism has an output end, the output end of the telescopic mechanism is fixedly connected with the film scraping assembly, and the telescopic mechanism can be telescopically extended along the extension direction of the base material.

[0027] Optionally, the driving assembly comprises two electric hydraulic push rods, the two electric hydraulic push rods are respectively located at two ends of the film scraping assembly, and the two ends of the two electric hydraulic push rods are respectively fixedly connected with the two fixed clamps.

[0028] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0029] The embodiment of the utility model provides a double-sided coating device comprising a fixed support, a stretching assembly, a film scraping assembly and a driving assembly, the base material is fixed and stretched through the stretching assembly, so that the base material can be kept flat, and the film scraping assembly is driven to move along the extension direction of the base material through the driving assembly, so that the base material is double-sided coated. Double-sided coating can effectively improve the uniformity and pore structure consistency of the composite diaphragm, thereby improving the overall performance of the diaphragm, so that the double-sided coated composite diaphragm prepared by the double-sided coating device can be close to the composite diaphragm prepared by the industrial coating equipment, and the test results in the experiment can be reproduced in industrial production. It can solve the problem of the related art that a double-sided coating device for a laboratory is urgently needed to improve the accuracy of experimental data about the composite diaphragm. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0031] Figure 1 is a structural schematic diagram of a double-sided coating device provided by the embodiment of the utility model;

[0032] Figure 2 is Figure 1 is an exploded structural schematic diagram of the double-sided coating device shown in the figure;

[0033] Figure 3 is Figure 1 is a partial structural schematic diagram of the double-sided coating device shown in the figure;

[0034] Figure 4 is a structural schematic diagram of a stretching assembly and a base material provided by the embodiment of the utility model;

[0035] Figure 5 is Figure 1Another perspective view of the double-sided coating device shown in the structure schematic diagram;

[0036] Figure 6 The structure schematic diagram of a scraping film assembly is provided by the embodiment of the utility model.

[0037] Figure 7 The sectional structure schematic diagram of a scraper is provided by the embodiment of the utility model.

[0038] Figure 8 The sectional structure schematic diagram of another scraper is provided by the embodiment of the utility model.

[0039] Figure 9 The sectional structure schematic diagram of another scraper is provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings to make the embodiment of the utility model further detailed description.

[0041] Although the utility model can be easily expressed as different forms of embodiments, only some specific embodiments shown in the drawings and described in detail in the specification, and it can be understood that the specification should be regarded as the exemplary description of the principle of the utility model, and not intended to limit the utility model to that described herein.

[0042] Therefore, the feature indicated in the specification will be used to explain one of the features of the embodiment of the utility model, and not imply that each embodiment of the utility model must have the described feature. In addition, it should be noted that the specification describes many features. Although certain features can be combined together to show possible system design, these features can also be used in other combinations not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to limit.

[0043] In the embodiments shown in the drawings, the indication of direction (such as up, down, left, right, front and back) is used to explain the structure and movement of various elements of the utility model is not absolute but relative. When these elements are in the position shown in the drawings, these descriptions are appropriate. If the position of these elements is changed, the indication of direction will also change accordingly.

[0044] The porous diaphragm is one of the core mechanisms of water electrolysis, and is used to separate the anode and cathode of the electrode plate to prevent short circuit between the electrodes, ensure the smooth progress of the electrolysis process, and prevent hydrogen gas formed at the cathode and oxygen gas formed at the anode from penetrating through the diaphragm to ensure the purity of hydrogen and oxygen. The porous diaphragm also serves as a moving channel for the electrolyte, facilitating the transport of hydroxyl ions from the cathode to the anode to maintain the continuous progress of the electrolysis reaction.

[0045] Generally, the porous diaphragm needs to have high mechanical strength, good chemical stability, good ion conductivity in alkaline environment and good air tightness. In recent years, the composite diaphragm can combine the characteristics of inorganic diaphragm and organic diaphragm, and has good alkali resistance and strong mechanical performance.

[0046] The composite diaphragm is usually composed of a substrate for mechanical support and a high molecular polymer coating for gas insulation and ion transmission. In the industrialized preparation of the composite diaphragm, a double-sided coating process is usually used to coat the high molecular polymer casting solution on the substrate, that is, after the casting solution and the substrate are fully infiltrated, the casting solution on the substrate is scraped to the designed thickness on both sides of the substrate using a scraper, and then the substrate is simultaneously immersed in a coagulation bath for phase inversion. Double-sided coating can effectively improve the uniformity and pore structure consistency of the composite diaphragm, thereby improving the overall performance of the diaphragm.

[0047] However, the industrial double-sided coating equipment is usually large in size, complex in structure and high in cost, and cannot be directly used for small-scale preparation in the laboratory. At present, the laboratory usually uses a glass plate single-sided coating method to prepare the composite diaphragm. For example, the substrate is fixed on the glass plate, the casting solution is poured on the substrate, and a scraper with a set thickness is used to coat the casting solution to fully immerse the entire substrate. However, in the single-sided coating operation, since the substrate is tightly attached to the glass plate, one side of the coated casting solution is exposed to the air, and the other side is in contact with the glass plate. During the coating process and subsequent phase inversion in the coagulation bath, the environments of the casting solutions on both sides of the substrate are different, and the pore structure and thickness uniformity of the composite diaphragm generated on both sides of the substrate will differ, resulting in that the single-sided coating cannot achieve the uniformity and symmetric structure of the pores of the double-sided coating. After experiments, the present inventors found that using the same casting solution, the composite diaphragm prepared by single-sided coating and the composite diaphragm prepared by double-sided coating under industrial conditions have great differences in surface morphology, porosity, air tightness and other parameters, and surface resistance, etc., which leads to that the excellent diaphragm obtained in the laboratory may not be reproduced in large-scale production.

[0048] Therefore, there is an urgent need for a double-sided coating device which is simple in structure, small in size, easy to operate and maintain, and suitable for laboratory use, so that researchers can perform double-sided coating in the laboratory, thereby more truly simulating the industrial production conditions, and ensuring that the test results in the experiment can be reproduced in industrial production.

[0049] Please refer to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of a double-sided coating device 10 provided by an embodiment of the present application, Figure 2 is Figure 1 An exploded structural schematic diagram of the double-sided coating device 10 shown in FIG. 1, the double-sided coating device 10 can include: a fixed support 11, a stretching assembly 12, a film scraping assembly 13, and a driving assembly 14.

[0050] The fixed support 11 can be placed on the ground or the experimental table surface, or the fixed support 11 can be bonded or connected to the experimental table surface to improve the stability of the fixed support 11.

[0051] The stretching assembly 12 can be installed on the fixed support 11 and used to fix and stretch the base material 20. The base material 20 can have a mesh structure that has a mechanical support function. For example, the base material 20 can include a polyphenylene sulfide (PPS) non-woven fabric mesh, a PP non-woven fabric mesh, a high water permeability (HPE) non-woven fabric mesh, a PE non-woven fabric mesh, and the like.

[0052] The stretching assembly 12 can uniformly stretch the base material 20, apply a certain tension to the sheet-shaped base material 20, and enable the base material 20 to remain flat, thereby avoiding the base material 20 fixed on the stretching assembly 12 from being wrinkled or uneven. In addition, the stretching assembly 12 can also improve the tension of the base material 20 to avoid loosening of the base material 20 during coating.

[0053] Please continue to refer to Figure 3 , Figure 3 is Figure 1 A partial structural schematic diagram of the double-sided coating device 10 shown in FIG. 1, the film scraping assembly 13 can have a containing groove c1 and a strip-shaped gap t1 located at the groove bottom of the containing groove c1. The containing groove c1 can be used to contain a casting solution, the base material 20 can be arranged in the strip-shaped gap t1, and the driving assembly 14 is fixedly connected with the film scraping assembly 13 and used to drive the film scraping assembly 13 to move along the extension direction of the base material 20. The casting solution refers to a high polymer solution formed by dissolving a high polymer compound in a solvent and then adding a pore former. The casting solution can be coated on a carrier, and a film is formed by volatilizing the solvent, so as to form a film with a specific structure and performance. The casting solution in the embodiment of the present application can form a high polymer film layer used for ion transmission.

[0054] Since the substrate 20 is arranged in the strip-shaped gap t1 of the doctor blade assembly 13, the substrate 20 can have the doctor blade assembly 13 on both sides, and the width of the strip-shaped gap t1 can be greater than the thickness of the substrate 20, so that the doctor blade assembly 13 can move relative to the substrate 20 arranged in the strip-shaped gap t1, thereby synchronously coating the casting solution on both sides of the substrate 20 during the movement of the doctor blade assembly 13. Moreover, after the doctor blade assembly 13 is used to coat the casting solution on the substrate 20 to a preset thickness on both sides of the substrate 20, the two layers of casting solution coated on both sides of the substrate 20 can be simultaneously introduced into a coagulation bath to undergo phase inversion to cause phase separation, thereby forming a film with specific structure and performance.

[0055] In this way, the uniformity and pore structure consistency of the composite diaphragm can be effectively improved by double-sided coating, thereby improving the overall performance of the diaphragm. Moreover, in the embodiment of the utility model, the substrate 20 is fixed and stretched by the stretching assembly 12, so that the substrate 20 can be kept flat, and the doctor blade assembly 13 is moved along the extension direction of the substrate 20 by the driving assembly 14 to coat the substrate 20 on both sides.

[0056] In the related art, one coating method of the substrate 20 is to use a roller to scrape the substrate 20, and when the viscosity of the casting solution is large, the rotation of the roller can reduce the thickness uniformity of the scraped film. Compared with the coating method in the related art, in the embodiment of the utility model, the doctor blade assembly 13 is moved to coat the film by fixing the substrate 20, which can improve the thickness uniformity of the coated film layer, and since the substrate 20 is always in a fixed tension state during coating, the flatness of the substrate 20 can be improved, thereby improving the quality of the composite diaphragm formed.

[0057] In an exemplary embodiment, the extension direction of the substrate 20 can be perpendicular to the ground, that is, the extension direction of the doctor blade assembly 13 can also be perpendicular to the ground. The substrate 20 and the edge of the strip-shaped gap t1 have a preset distance, so that the doctor blade assembly 13 can coat a film layer with a preset thickness on the substrate 20.

[0058] In conclusion, the utility model embodiment provides a kind of double-sided coating device 10 comprising fixed support 11, stretching component 12, membrane scraping component 13 and driving component 14, by stretching component 12 fixed and stretch base material 20, so that base material 20 can keep flat, and by driving component 14 drive membrane scraping component 13 moves along the extension direction of base material 20, to carry out double-sided coating to base material 20.Double-sided coating can effectively improve the uniformity and pore structure consistency of composite diaphragm, and then improve the overall performance of diaphragm, so that the double-sided coating composite diaphragm prepared by double-sided coating device 10 can be close to the composite diaphragm prepared by industrial coating equipment, to ensure that the test results in experiment can be reproduced in industrial production.It can solve the problem of the double-sided coating device 10 for laboratory in related art to improve the accuracy of experimental data about composite diaphragm.

[0059] Please refer to Figure 1 And Figure 4 , Figure 4 It is the structure schematic view of stretching component 12 and base material 20 provided by the utility model embodiment, in an alternative embodiment, stretching component 12 can include two oppositely arranged clamping structures 121;Two clamping structures 121 are located at the two ends of base material 20 respectively, and clamp the edge portion of base material 20;Two clamping structures 121 are movably connected with fixed support 11.Base material 20 can be rectangular, have first edge and second edge opposite along vertical direction, and have third edge and fourth edge opposite along horizontal direction.The vertical direction can be the direction perpendicular to ground, and the horizontal direction can be the direction parallel to ground.Both clamping structures 121 can clamp the first edge portion and the second edge portion of base material 20 respectively, and since both clamping structures 121 are movably connected with fixed support 11, the tension state of base material 20 can be adjusted by adjusting the distance between both clamping components, so that base material 20 is pulled flat and straight by both clamping structures 121.

[0060] Please refer to Figure 4 In an alternative embodiment, any one clamping structure 121 can include adjusting part 1211 and two oppositely arranged clamping plate parts 1212;Both clamping plate parts 1212 are connected with adjusting part 1211, and adjusting part 1211 is used to adjust the distance between both clamping plate parts 1212.Edge portion of base material 20 is clamped by two clamping plates in any one clamping structure 121, so that opposite two clamping structures 121 can uniformly stretch base material 20, so that the stress at each position of base material 20 is uniform, reduce the phenomenon that stress concentration appears on base material 20, avoid affecting the mechanical strength of base material 20 itself in the process of stretching.And, it can also improve the tension and stability of base material 20.

[0061] When the substrate 20 is installed between the two clamping plate portions 1212, the distance between the two clamping plate portions 1212 can be increased by the adjusting portion 1211, so that the experimenter can place the edge portion of the substrate 20 between the two clamping plate portions 1212, and then the distance between the two clamping plate portions 1212 can be reduced by the adjusting portion 1211, so that the two clamping plate portions 1212 clamp the edge portion of the substrate 20.

[0062] In an exemplary embodiment, the clamping structure 121 can include a silk screen printing net stretcher, a taut net stretcher, a diamond net stretcher, a screen window / door net stretcher, a small net stretcher, etc.

[0063] Please refer to Figure 1 , Figure 2 and Figure 5 , Figure 5 is Figure 1 another perspective view of the double-sided coating device shown in FIG. 1, in an alternative embodiment, the fixed support 11 can include a fixed base 111, a support rod 112, and two mounting portions 113; the support rod 112 is fixedly installed on the fixed base 111; the two mounting portions 113 are arranged along the length direction of the support rod 112, and are both movably connected with the support rod 112, and the two mounting portions 113 are respectively movably connected with the two clamping structures 121. The distance between the two mounting portions 113 can be adjusted to adjust the distance between the two clamping structures 121, so as to stretch and straighten the substrate 20. Exemplarily, the fixed support 11 can include a flat plate type blender support, an arc type blender support, an iron stand, a titration stand, etc.

[0064] In an alternative embodiment, the mounting portion 113 can include a cross clamp 1131 and a connecting rod 1132; the cross clamp 1131 is respectively connected with the support rod 112 and the connecting rod 1132; the connecting rod 1132 is connected with the clamping structure 121 at the end away from the cross clamp 1131. Exemplarily, the cross clamp 1131 can include an English cross clamp 1131, a German cross clamp 1131, an European cross clamp 1131, etc.

[0065] Please refer to Figure 3 and Figure 6 , Figure 6is a structure diagram of a doctor blade assembly provided by the embodiment of the utility model, in an alternative implementation, the doctor blade assembly 13 can include two oppositely arranged doctor blades 131 and two oppositely arranged fixed clamps 132;Two doctor blades 131 are respectively located at the two sides of the base material 20, and an acute angle is formed between any one doctor blade 131 and the base material 20, and the two doctor blades 131 enclose a receiving groove c1 and a strip-shaped gap t1;Two fixed clamps 132 are respectively located at the two ends of the two doctor blades 131, any one fixed clamp 132 is respectively connected with the end portion of the two doctor blades 131, and is connected with the driving assembly 14.

[0066] The doctor blade 131 can be used to scrape and coat the casting solution on the vertically fixed base material 20, the included angle between any one doctor blade 131 and the base material 20 is greater than 0° and less than 90°, and the included angle between any one doctor blade 131 and the base material 20 is 30°-60°, for example. The coating thickness of the casting solution can be adjusted by simultaneously adjusting the spacing between the one end of the doctor blade 131 close to the base material 20 and the base material 20.

[0067] In an alternative implementation, the fixed clamp 132 can include a right-angle fixed clamp or an adjustable-angle clamp. For example, the smaller the included angle between the doctor blade 131 and the base material 20, the greater the viscosity of the casting solution.

[0068] Please refer to Figure 7 , Figure 8 and Figure 9 , Figure 7 is a cross-sectional structure diagram of a doctor blade 131 provided by the embodiment of the utility model, Figure 8 is another cross-sectional structure diagram of a doctor blade 131 provided by the embodiment of the utility model, Figure 9 is another cross-sectional structure diagram of a doctor blade 131 provided by the embodiment of the utility model, in an alternative implementation, the end portion of the doctor blade 131 close to the base material 20 can be semicircular, and the diameter of the semicircle is greater than or equal to 0.1 cm and less than or equal to 1 cm. The doctor blade with a circular end portion has the characteristics of wide applicability, good uniformity of the formed coating, strong adaptability and good durability, for example, the doctor blade with a circular end portion is more suitable for high-viscosity coating agents, and the circular end portion allows the casting solution to have a longer pressure and flow time under the blade edge, which helps the uniform distribution of the coating agent on the base material. In addition, the doctor blade with a circular end portion can avoid the destruction or unevenness of the casting solution during the scraping process, can make the surface of the coating formed by coating more smooth and uniform, and can improve the quality of the coating.

[0069] Alternatively, the end section of the doctor blade 131 near the substrate side can be in a right-angled trapezoidal or right-angled triangular shape, which has better applicability and lower manufacturing difficulty. In actual operation, the experimenters can select a suitable doctor blade shape and installation direction of the doctor blade according to the casting solution.

[0070] For example, the doctor blade 131 can include a coating machine doctor blade 131, a cloth cutting machine blade, a cutting machine thickened heavy blade, a long strip-shaped blade for slitting in the food / pharmaceutical industry, etc. The material of the doctor blade 131 can include stainless steel, which is easy to clean and has good hardness, suitable for coating and film casting of high-viscosity casting solution, to avoid deformation of the doctor blade 131.

[0071] Please refer to Figure 1 and Figure 2 In an alternative embodiment, the driving assembly 14 can include a telescopic mechanism having an output end, the output end of the telescopic mechanism is fixedly connected with the film coating assembly 13, and the telescopic mechanism can be telescoped along the extension direction of the substrate 20. The driving assembly 14 can include two electric hydraulic push rods 141, which are respectively located at both ends of the film coating assembly 13, and the ends of the two electric hydraulic push rods 141 are respectively fixedly connected with the two fixed clamps 132.

[0072] The speed and stroke of the electric hydraulic push rod 141 can be adjusted according to the test requirements, to ensure that the film coating assembly 13 moves vertically at a constant speed during coating, and to realize uniform double-sided coating.

[0073] The plurality of components of the double-sided coating device 10 in the embodiment of the utility model are detachably connected, so that the experimenters can quickly disassemble and reassemble the double-sided coating device 10, which facilitates the replacement, maintenance and cleaning of the components in the double-sided coating device 10, and meanwhile, the disassembly and storage can reduce the occupied space of the double-sided coating device 10.

[0074] In addition, the clamping structure 121 in the embodiment of the utility model can adjust the upper and lower spacing according to the coating size requirements, can adjust the spacing between the doctor blade 131 and the substrate 20 according to the coating thickness, and can also adjust the included angle of the doctor blade 131 through the adjustable angle clamp according to the flow speed of the casting solution. The pushing stroke and pushing speed of the electric hydraulic push rod 141 can be adjusted according to the requirements of the coating size and coating time. Through the adjustment of each component, the coating requirements of various sizes and various thicknesses can be met, so that the process parameters of the industrial coating equipment can be simulated for coating operation.

[0075] In an exemplary embodiment, the double-sided coating of the substrate 20 using the double-sided coating device 10 in any of the above embodiments can include the following steps:

[0076] Step 1, assemble the double-sided coating device 10.

[0077] First, two clamping structures 121 are respectively fixed on the iron stand in parallel through two cross clamps 1131. Then, two electric hydraulic push rods 141 are respectively installed on both sides of the iron stand, and the push heads of the two electric hydraulic push rods 141 are fixedly connected with the film scraping assembly 13 fixed clamp 132, forming a structure that can push the film scraping assembly 13 in the vertical direction.

[0078] Then, a polyphenylene sulfide (PPS) wire screen of a preset specification is installed between the two clamping structures 121, and the two ends of the polyphenylene sulfide (PPS) wire screen are clamped by the two clamping structures 121. Then, the spacing of the clamping structures 121 at both ends is adjusted according to the tension of the polyphenylene sulfide (PPS) wire screen, so as to ensure that the entire coating area of the polyphenylene sulfide (PPS) wire screen is flat and straight. Moreover, the PPS wire screen has sufficient tension in the vertical direction, so as to avoid the problem of uneven coating thickness caused by relaxation during coating.

[0079] The PPS wire screen of the preset specification can be a 50-mesh PPS wire screen with a thickness of 200μm, a length of 50cm, and a width of 30cm.

[0080] Furthermore, the doctor blade 131 of the preset specification is installed on both sides of the substrate 20 through the fixed clamp 132. The designed coating film thickness in the embodiment of the present application is 400μm. Since the thickness of the PPS wire screen is 200μm, the narrowest spacing of the wire screen between the doctor blade 131 and the PPS is 100μm.

[0081] For example, the doctor blade 131 can be a single-edge stainless steel doctor blade 131 with a length of 60cm, a width of 8cm, and a thickness of 1cm.

[0082] Step 1, coating the casting solution.

[0083] An appropriate amount of casting solution is poured into the accommodation groove c1 surrounded by the two doctor blades 131. During pouring, it is necessary to ensure that the casting solution is uniformly distributed on both sides of the PPS wire screen and remains consistent.

[0084] The pushing speed of the electric hydraulic push rod 141 is set to 3 mm / s, and the pushing distance is 500 mm. The two electric hydraulic push rods 141 are started synchronously, so that the push rod drives the film scraping structure to move upward at a constant speed. Under the action of the electric hydraulic push rod 141, the doctor blade 131 synchronously coats the two sides of the PPS wire mesh during the movement. As the push rod of the pusher slowly and uniformly rises, the doctor blade 131 gradually coats the entire surface of the wire mesh with the casting solution, forming a continuous coating film layer. When the electric hydraulic push rod 141 drives the film scraping structure to move to the top end of the PPS wire mesh according to the set stroke, the upper and lower clamping structures 121 are loosened, and the coated composite diaphragm is pulled out from the clamping structure 121 for subsequent operation.

[0085] Step 3, disassemble, clean, dry and store the double-sided coating device 10.

[0086] After coating, the following operations can be performed in sequence: ① turn off the electric hydraulic push rod 141; ② loosen the adjustable angle clamp, remove the two doctor blades 131, and separate the adjustable angle clamp from the electric hydraulic push rod 141; ③ separate the clamping structure 121 from the fixed support 11; ④ remove the cross clamp 1131 from the support rod 112 to disassemble and separate the double-sided coating device 10.

[0087] After disassembly and separation, the components of the double-sided coating device 10 can be cleaned and dried. The following operations can be performed in sequence: ① use deionized water to rinse the residual casting solution on the doctor blade 131, then use a solvent (such as ethanol, isopropanol or a special cleaning solution) to clean the residual casting solution on the surface of the doctor blade 131, and finally use a soft cloth or soft brush to clean the surface of the doctor blade 131; ② if there is residual casting solution on the adjustable angle clamp, the electric hydraulic push rod 141 and the clamping structure 121, etc., a damp cloth soaked with the above-mentioned solvent can be used for wiping to ensure that the surface of each component is clean and free of dirt; ③ place the cleaned components in an oven for drying, and the electric hydraulic push rod 141 needs to be wiped dry with a dry cloth. The cleaned and dried components can be stored in categories to ensure long-term stable use of the device.

[0088] It should be noted that in the drawings, the dimensions of the regions can be exaggerated for the sake of clarity. It will be understood that when a member is referred to as being "on" another member, it can be directly on the other member or intervening members can also be present. In addition, it will be understood that when a member is referred to as being "below" another member, it can be directly below the other member or one or more intervening members can also be present. In addition, it will be understood that when a member is referred to as being "between" two members, it can be the only member between the two members or one or more intervening members can also be present. Like reference numerals designate like elements throughout.

[0089] In the utility model, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. The term "multiple" refers to two or more than two, unless otherwise explicitly limited.

[0090] The above only describes optional embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A double-sided coating apparatus, characterized by, The application relates to a fixed support, a stretching assembly, a film scraping assembly and a driving assembly. The stretching assembly is installed on the fixed support and used for fixing and stretching a base material. The film scraping assembly has a containing groove for containing casting solution and a strip-shaped gap at the groove bottom. The driving assembly is fixedly connected with the film scraping assembly and used for driving the film scraping assembly to move along the extension direction of the base material. The stretching assembly comprises two oppositely arranged clamping structures.

2. The double-sided coating apparatus according to claim 1, characterized in that The two clamping structures are respectively arranged at the two ends of the base material and clamp the edge portions of the base material. The two clamping structures are movably connected with the fixed support. The clamping structure comprises an adjusting portion and two oppositely arranged clamping plate portions.

3. The double-sided coating apparatus according to claim 2, characterized in that The two clamping plate portions are connected with the adjusting portion, and the adjusting portion is used for adjusting the distance between the two clamping plate portions. The fixed support comprises a fixed base, a supporting rod and two mounting portions.

4. The double-sided coating apparatus according to claim 2, wherein The supporting rod is fixedly installed on the fixed base. The two mounting portions are arranged along the length direction of the supporting rod and movably connected with the supporting rod. The mounting portion comprises a cross-shaped clamp and a connecting rod.

5. The double-sided coating apparatus according to claim 4, characterized in that The cross-shaped clamp is connected with the supporting rod and the connecting rod. The end of the connecting rod, which is away from the cross-shaped clamp, is connected with the clamping structure. The film scraping assembly comprises two oppositely arranged scrapers and two oppositely arranged fixed clamps.

6. The double-sided coating apparatus according to claim 4, wherein The two scrapers are respectively arranged at the two sides of the base material, and the included angle between any one of the scrapers and the base material is acute. The two fixed clamps are respectively arranged at the two ends of the two scrapers. The fixed clamp comprises a right-angle fixed clamp or an adjustable-angle clamp.

7. The double-sided coating apparatus according to claim 6, characterized in that The end portion of the scraper, which is close to the base material, has a semicircular cross section, a right-angle trapezoidal cross section or a right-angle triangular cross section.

8. The double-sided coating apparatus according to claim 6, characterized in that The driving assembly comprises a telescopic mechanism, and the telescopic mechanism has an output end.

9. The double-sided coating apparatus according to claim 6, wherein The output end of the telescopic mechanism is fixedly connected with the film scraping assembly.

10. The double-sided coating apparatus according to claim 9, characterized in that The telescopic mechanism can be telescopically extended along the extension direction of the base material. The driving assembly comprises two electric hydraulic push rods. The two electric hydraulic push rods are respectively arranged at the two ends of the film scraping assembly. The end portions of the two electric hydraulic push rods are respectively fixedly connected with the two fixed clamps.

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