Double-sided coating device suitable for alkaline electrolytic water hydrogen production diaphragm

Abstract

The utility model provides a double-sided coating device suitable for an alkaline electrolytic water hydrogen production diaphragm, which belongs to the technical field of electrolytic bath diaphragm manufacturing and comprises a roller coating mechanism, a blade coating mechanism and a feeding mechanism. The roller coating mechanism comprises a base assembly and a coating roller set arranged on the base assembly, the coating roller set is provided with two coating rollers which are arranged side by side and rotate reversely, and a roller coating gap is formed between the two coating rollers; the blade coating mechanism comprises a coating scraping groove formed in the upper portion of the base assembly, and a blade coating gap is formed in the lower end of the coating scraping groove and located over the roller coating gap; the feeding mechanism comprises a feeding distributor installed above the coating scraping groove. According to the double-sided coating device suitable for the alkaline electrolytic water hydrogen production diaphragm, a slit with larger rigidity is formed by utilizing the roller coating gap between the two coating rollers so as to ensure the consistency of the thicknesses of coatings on the two sides of the diaphragm, and the problem that bubbles exist in the coatings is solved by adopting a mode of combining blade coating and roller coating.

Description

Technical Field

[0001] This utility model belongs to the field of electrolytic cell diaphragm manufacturing technology, and more specifically, it relates to a double-sided coating device suitable for alkaline water electrolysis to produce hydrogen diaphragms. Background Technology

[0002] Hydrogen energy, as a highly efficient and clean energy source that is completely decarbonized, is considered the ultimate energy source for human sustainable development. Electrolysis of water to produce hydrogen is currently the main method for producing green hydrogen due to its environmental friendliness, lack of pollution, renewability, and high product purity. Among these methods, alkaline electrolyzers have the highest market share and are the most technologically mature. In alkaline electrolyzers, the diaphragm plays a crucial role. It divides the electrolyzer into cathode and anode regions, preventing direct contact between the electrodes and short circuits; it separates the hydrogen and oxygen produced at the cathode and anode, preventing them from penetrating and mixing; and the diaphragm also needs to have high ionic conductivity to facilitate the transfer of hydroxide ions between the electrodes.

[0003] Currently, the third-generation separators used in the industry are novel composite separators based on polyphenylene sulfide (PPS) fabric. PPS fabric has weak hydrophilicity, therefore, it is necessary to modify the PPS fabric to enhance its hydrophilicity. A common modification method is to coat the surface with a functional coating.

[0004] Existing equipment uses a slurry-pulling coating process. PPS fabric passes through a slit at the bottom of a slurry tank, and the slurry is rubbed onto the PPS fabric as it passes through the slit. The coating thickness is adjusted by changing the width of the slit. This coating method has the following drawbacks: the slit lacks rigidity, making it difficult to ensure consistent width at both ends, resulting in inconsistent coating thickness on both sides of the diaphragm and the presence of air bubbles in the coating. Utility Model Content

[0005] The purpose of this invention is to provide a double-sided coating device suitable for alkaline water electrolysis hydrogen production diaphragms, aiming to solve the problem that insufficient rigidity of the slit makes it difficult to ensure the consistency of the width at both ends of the slit, resulting in inconsistent coating thickness on both sides of the diaphragm and the presence of air bubble defects in the coating.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a double-sided coating device suitable for alkaline water electrolysis hydrogen production diaphragms, comprising:

[0007] A roller coating mechanism, comprising a base assembly and a coating roller assembly disposed on the base assembly, the coating roller assembly having two coating rollers arranged side by side and rotating in opposite directions, with a roller coating gap formed between the two coating rollers;

[0008] The coating mechanism includes a coating trough mounted above the base assembly, the lower end of the coating trough having a coating gap, the coating gap being located directly above the roller coating gap;

[0009] The feeding mechanism includes a feeding distributor installed above the scraper coating trough, the feeding distributor being used to supply slurry into the scraper coating trough.

[0010] In one possible implementation, a metering roller is provided on the outer side of the coating roller, a metering gap is formed between the coating roller and the metering roller, and a slurry storage tank is formed above the metering gap.

[0011] In one possible implementation, bearing seats are provided at both ends of the coating roller and both ends of the metering roller. A plurality of bearing seats are symmetrically arranged on both sides of the upper end of the base assembly. A drive motor is provided on the outer side of the bearing seat on either side. The drive motor is connected to the coating roller or the metering roller through a reducer.

[0012] In one possible implementation, a wedge assembly is provided between two adjacent bearing seats on the same side. The wedge assembly includes a fixed block, a sliding block, and a driving member. The fixed block and the sliding block are respectively disposed on the two adjacent bearing seats, and an inclined surface is formed between the fixed block and the sliding block. The driving member is used to drive the sliding block to slide along the inclined surface to adjust the distance between the two coating rollers on the two adjacent bearing seats or between the coating roller and the metering roller.

[0013] In one possible implementation, the drive component includes a first fixed seat, a lead screw, and a handwheel. The first fixed seat is fixed to the outer side of the bearing seat, the lead screw is rotatably mounted on the first fixed seat, one end of the lead screw abuts against the sliding block, and the handwheel is located at the other end of the lead screw.

[0014] In one possible implementation, baffle plates are provided on both sides of the slurry storage tank. The lower end of the baffle plate conforms to the inside of the slurry storage tank to seal both ends. The baffle plate is installed on the bearing seat on the corresponding side.

[0015] In one possible implementation, an optical axis is vertically disposed through the baffle plate, and a second fixing seat is fixed to the end of the optical axis, the second fixing seat being fixed to the inner side of the bearing seat.

[0016] In one possible implementation, the base assembly includes a bottom frame and mounting portions disposed on both sides of the bottom frame, the mounting portions being used to slidably mount a plurality of the bearing seats on the corresponding sides.

[0017] In one possible implementation, clamping parts for positioning multiple bearing seats on the same side in the front and rear directions are respectively provided on the front and rear sides of the mounting part, fixing blocks for fixing the position of the bearing seat corresponding to the coating roller are respectively provided on the left and right sides of the bottom frame, and limiting blocks for limiting the distance between the bearing seats corresponding to two coating rollers on the same side are respectively provided in the middle of the left and right sides of the bottom frame.

[0018] In one possible implementation, the two feeding distributors are symmetrically arranged on the front and rear sides above the scraper coating trough, and a plurality of discharge pipes are arranged sequentially on the side of the feeding distributor closer to the scraper coating trough, and a feed pipe is arranged in the middle of the side of the feeding distributor away from the scraper coating trough.

[0019] The beneficial effects of this invention's double-sided coating device for alkaline water electrolysis hydrogen production diaphragms are as follows: Compared with the prior art, the feed distributor supplies slurry to the scraper coating tank. The width of the scraper coating gap in the tank is greater than the thickness of the diaphragm. The diaphragm passes through the scraper coating gap from top to bottom, forming a scraper coating on both sides. Because the scraper coating gap is completely occupied by the slurry, air bubbles inside the slurry are squeezed out as it passes through the gap, and then enter the coating roller group below. The two coating rollers rotate upwards within the roller coating gap, the width of which is greater than the thickness of the diaphragm with the scraper coating. The diaphragm passes through the roller coating gap from top to bottom, forming a roller coating on both sides. This invention provides a double-sided coating device for alkaline water electrolysis hydrogen production diaphragms. It utilizes the roller coating gap between the two coating rollers to form a rigid slit to ensure the consistency of the coating thickness on both sides of the diaphragm. By combining scraper coating and roller coating, and using a scraper coating followed by roller coating, the problem of air bubbles in the coating is solved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a double-sided coating device for an alkaline water electrolysis hydrogen production diaphragm provided in this embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the roller coating mechanism provided by this utility model;

[0023] Figure 3 Assembly drawing of coating roller, metering roller, bearing housing and drive mechanism provided for this utility model;

[0024] Figure 4 A schematic diagram of the structure of the wedge assembly provided by this utility model;

[0025] Figure 5 A schematic diagram of the structure of the baffle plate provided by this utility model;

[0026] Figure 6 A schematic diagram of the structure of the base assembly provided by this utility model;

[0027] Figure 7 A schematic diagram of the feeding mechanism provided by this utility model;

[0028] Figure 8 A diagram illustrating the working state of roller coating provided by this utility model.

[0029] In the diagram: 1. Roller coating mechanism; 11. Coating roller assembly; 12. Inclined iron assembly; 14. Base assembly; 111. Metering roller; 112. Coating roller; 113. Bearing seat; 114. Drive motor; 121. Fixed block; 122. Sliding block; 123. First fixed seat; 124. Lead screw; 125. Handwheel; 131. Second fixed seat; 132. Optical shaft; 133. Baffle plate; 141. Outer pad; 142. Limiting block; 143. Fixed block; 144. Mounting guide rail; 145. Connecting beam; 146. Limiting seat; 147. Top screw; 148. Inner pad; 2. Scraping mechanism; 3. Feeding mechanism; 31. Feeding distributor; 32. Plug; 33. Support frame; 34. Ball valve; 35. Discharge pipe; 4. Slurry storage tank. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0031] Unless otherwise explicitly specified, the use of terms such as "first," "second," or "third" is intended to distinguish different objects, not to describe a specific order.

[0032] Unless otherwise expressly defined, the use of directional terms such as “center,” “lateral,” “longitudinal,” “horizontal,” “vertical,” “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” “back,” “left,” “right,” “clockwise,” “counterclockwise,” “high,” and “low” to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of the present invention.

[0033] Please see Figures 1 to 8 This invention provides a double-sided coating apparatus suitable for alkaline water electrolysis hydrogen production diaphragms. The apparatus includes a roller coating mechanism 1, a scraper coating mechanism 2, and a feeding mechanism 3. The roller coating mechanism 1 includes a base assembly 14 and a coating roller group 11 disposed on the base assembly 14. The coating roller group 11 has two parallel, counter-rotating coating rollers 112, forming a roller coating gap between the two rollers 112. The scraper coating mechanism 2 includes a scraper coating trough mounted above the base assembly 14, with a scraper coating gap at its lower end, located directly above the roller coating gap. The feeding mechanism 3 includes a feeding distributor 31 mounted above the scraper coating trough, which supplies slurry into the scraper coating trough.

[0034] This invention provides a double-sided coating device for alkaline water electrolysis hydrogen production diaphragms. Compared with existing technologies, the feeding distributor 31 supplies slurry to the scraping coating tank. The width of the scraping gap in the scraping coating tank is greater than the thickness of the diaphragm. The diaphragm passes through the scraping gap from top to bottom, forming a scraped coating layer on both sides. Because the scraping gap is completely occupied by the slurry, air bubbles inside the slurry are squeezed out as it passes through the scraping gap, and then enter the coating roller group 11 below. The two coating rollers 112 rotate upward within the roller coating gap. The width of the roller coating gap is greater than the thickness of the diaphragm with the scraped coating layer attached. The diaphragm passes through the roller coating gap from top to bottom, forming a roller coating layer on both sides. This invention provides a double-sided coating device for alkaline water electrolysis hydrogen production diaphragms. It utilizes the roller coating gap between the two coating rollers 112 to form a rigid slit to ensure the consistency of the coating thickness on both sides of the diaphragm. It adopts a combination of scraping and roller coating, with scraping followed by roller coating, which solves the problem of air bubbles in the coating.

[0035] Preferably, two movable plates can be arranged opposite each other at the bottom of the coating trough, and the coating gap is located between the two movable plates. One or both movable plates can be adjusted by means of a screw or dial indicator to adjust the coating gap to meet the needs of diaphragms of different thicknesses.

[0036] Please see Figure 3 A metering roller 111 is provided on the outer side of the coating roller 112, and a metering gap is formed between the coating roller 112 and the metering roller 111. A slurry storage tank 4 is formed above the metering gap. Both the coating roller 112 and the metering roller 111 are steel rollers. The assembly components of the four steel rollers are the same, except that the dimensions of the coating roller 112 and the metering roller 111 and the dimensions of the corresponding mounting parts are different.

[0037] The metering roller 111 does not rotate during production. The thickness of the coating on the coating roller 112 is adjusted by the metering gap between it and the coating roller 112. A slurry storage tank 4 is formed above the metering gap. The slurry storage tank 4 works with the feeding mechanism 3 to maintain a certain amount of slurry. Preferably, the metering roller 111 can rotate when not in production, which facilitates cleaning of the surface of the metering roller 111.

[0038] Bearing seats 113 are provided at both ends of the coating roller 112 and the metering roller 111. Multiple bearing seats 113 are symmetrically arranged on both sides of the upper end of the base assembly 14. A drive motor 114 is provided on the outer side of the bearing seat 113 on either side. The drive motor 114 is connected to the coating roller 112 or the metering roller 111 through a reducer. The drive motor 114 is a servo motor. The two ends of the coating roller 112 and the metering roller 111 are rotatably connected to the bearing seats 113 respectively. The servo motor is connected to the drive end of the coating roller 112 and the metering roller 111 through a reducer and a coupling.

[0039] Please see Figure 4 An inclined iron assembly 12 is provided between two adjacent bearing seats 113 on the same side. The inclined iron assembly 12 includes a fixed block 121, a sliding block 122 and a driving member. The fixed block 121 and the sliding block 122 are respectively provided on the two adjacent bearing seats 113. An inclined surface is formed between the fixed block 121 and the sliding block 122. The driving member is used to drive the sliding block 122 to slide along the inclined surface to adjust the distance between the two coating rollers 112 on the two adjacent bearing seats 113 or between the coating roller 112 and the metering roller 111. When it is necessary to adjust the gap between the two coating rollers 112 or between the coating roller 112 and the metering roller 111, the sliding block 122 is driven to slide along the inclined surface by the driving component. Under the constraint of the inclined surface, the sliding block 122 forms an inclined displacement relative to the fixed block 121, thereby causing relative displacement of the two bearing seats 113 on which the fixed block 121 and the sliding block 122 are respectively located. This achieves the purpose of adjusting the gap between the two coating rollers 112 or between the coating roller 112 and the metering roller 111 mounted on the two bearing seats 113. In terms of improving production efficiency, compared to the traditional method of stopping the machine to remove and install shims to adjust the roller gap, it allows for online real-time dynamic adjustment. Once the process parameters need to be changed, there is no need to interrupt the production process; the driving component responds instantly and quickly completes the adjustment, greatly saving time and improving overall production efficiency.

[0040] Specifically, the driving components include a first fixed base 123, a lead screw 124, and a handwheel 125. The first fixed base 123 is fixed to the outer side of the bearing housing 113. The lead screw 124 is rotatably mounted on the first fixed base 123, with one end of the lead screw 124 abutting against the sliding block 122. The handwheel 125 is located at the other end of the lead screw 124. The handwheel 125 has anti-slip grooves, which increase the friction between the operator's hand and the handwheel 125, allowing the operator to apply force more stably when turning the handwheel 125. When the handwheel 125 is turned, the lead screw 124 rotates and pushes the sliding block 122 forward axially. A wear-resistant pad is provided at the end of the sliding block 122 that abuts against the lead screw 124. The wear-resistant pad is made of high-strength wear-resistant material, which helps reduce wear between the lead screw 124 and the sliding block 122, extending the service life of the equipment. It also ensures that the sliding block 122 slides more smoothly under the push of the lead screw 124. The roller coating gap or metering gap can be adjusted by using a handwheel 125 and a lead screw 124 for driving. Alternatively, a motor can be used to drive a gear or a synchronous belt to move the wedge and adjust the gap.

[0041] Please see Figure 5 A baffle plate 133 is provided on both sides of the slurry storage tank 4. The lower end of the baffle plate 133 conforms to the inside of the slurry storage tank 4 to seal both ends. The baffle plate 133 is installed on the bearing seat 113 on the corresponding side. The baffle plate 133 is made of high-strength rubber material, which has good flexibility and sealing properties and can effectively prevent slurry leakage. The lower ends of the baffle plate 133 form arc structures that conform to the outer walls of the coating roller 112 and the metering roller 111, respectively. The lower end of the baffle plate 133 forms a sharp corner structure that is inserted into the metering gap. When the upper end of the baffle plate 133 is higher than the upper ends of the coating roller 112 and the metering roller 111, the baffle plate 133 forms a good baffle effect on both sides of the slurry storage tank 4.

[0042] Specifically, a light shaft 132 is vertically inserted through the adhesive baffle 133, and a second fixing seat 131 is fixed to the end of the light shaft 132. The second fixing seat 131 is fixed to the inner side of the bearing seat 113. There are two light shafts 132, which run side by side through the upper part of the adhesive baffle 133. The lower end of the light shaft 132 is higher than the upper ends of the coating roller 112 and the metering roller 111, effectively preventing adhesive sticking and ensuring the normal operation of the equipment. The design of two light shafts 132 running side by side through the upper part of the adhesive baffle 133 enhances the stability of the adhesive baffle 133. During long-term operation of the equipment, the adhesive baffle 133 is less likely to shake or shift. The second fixing seat 131 is stably fixed to the bearing seat 113 with screws. When the equipment is maintained or repaired, the second fixing seat 131 can be easily removed by simply unscrewing the screws, facilitating the inspection and repair of the light shaft 132 or other related components, greatly improving the convenience of equipment maintenance. Furthermore, this structural layout is compact and reasonable, and will not take up too much space, enabling the entire equipment to efficiently complete the coating work within a limited space.

[0043] Please see Figure 6 The base assembly 14 includes a bottom frame and mounting portions disposed on both sides of the bottom frame. The mounting portions are used for slidingly mounting multiple bearing seats 113 on corresponding sides. The bottom frame includes two outer pads 141 and two connecting beams 145. In addition, an inner pad 148 is integrally formed on the inner side of the outer pads 141. The two connecting beams 145 are connected to the two inner pads 148. The two inner pads 148, the two outer pads 141, and the two connecting beams 145 form a rectangular bottom frame structure, which improves the structural strength of the bottom frame. The mounting portions include multiple mounting guide rails 144 arranged sequentially. The bearing seats 113 on the same side are slidably mounted on the mounting guide rails 144 one by one. Adjacent bearing seats 113 can slide relative to each other, thereby adjusting the distance between them.

[0044] Specifically, the mounting section has clamping parts on both the front and rear sides for positioning multiple bearing seats 113 on the same side in the front-back direction. The bottom frame has fixing blocks 143 on both the left and right sides for fixing the position of the bearing seats 113 corresponding to the coating rollers 112. The middle of the left and right sides of the bottom frame has limiting blocks 142 for limiting the distance between the bearing seats 113 corresponding to two coating rollers 112 on the same side. The clamping part includes limiting seats 146 on both the front and rear sides of the outer pad 141. A set screw 147 is installed on the top of the limiting seat 146. By rotating the set screws 147 on both sides, the multiple bearing seats 113 on the same side can be fixed in the front-back direction. The fixing blocks 143 are located on the outside of the bearing seats 113, and by pressing against the bearing seats 113, they limit the outward displacement of the bearing seats 113. The limiting blocks 142 limit the distance between the bearing seats 113 corresponding to two coating rollers 112 on the same side, thereby achieving the purpose of limiting the minimum gap between the rollers.

[0045] During actual equipment installation and commissioning, installers first place the bearing housing 113 in a suitable position on the clamping part, using the limiting seat 146 and set screw 147 of the clamping part to initially position the bearing housing 113 in the front-back direction. Then, the bearing housing 113 is assembled with the coating roller 112, and the assembled parts are placed on the bottom frame. At this time, the fixing blocks 143 on the left and right sides begin to function, tightly pressing against the bearing housing 113 to prevent it from shifting outward. The limiting block 142 in the middle strictly limits the distance between the bearing housings 113 corresponding to the two coating rollers 112 on the same side, ensuring that the minimum gap between the rollers meets the requirements of the coating process.

[0046] During equipment operation, the bearing housing 113 may experience slight displacement due to machine vibration and other factors. However, this displacement is promptly contained by the coordinated action of the clamping part, the fixed stop 143, and the limiting stop 142. The set screw 147 of the clamping part can be finely adjusted as needed to ensure accurate positioning of the bearing housing 113 in the front-rear direction. The fixed stop 143 consistently restricts the outer side of the bearing housing 113, and the limiting stop 142 continuously ensures a stable distance between the bearing housings 113 corresponding to the two coating rollers 112 on the same side. This ensures the stability of the coating process and the consistency of coating quality, thereby improving the overall working efficiency and product quality of the coating equipment.

[0047] Please see Figure 7Two feed distributors 31 are symmetrically arranged on the front and rear sides above the scraper trough. Multiple discharge pipes 35 are sequentially arranged on the side of the feed distributor 31 closest to the scraper trough, and an inlet pipe is located in the middle of the side of the feed distributor 31 furthest from the scraper trough. The feed distributor 31 is a hollow tube with plugs 32 at both ends, creating a space inside to hold the slurry. An inlet pipe is installed on the outer middle of the feed distributor 31, through which the slurry enters and is discharged into the scraper trough through the multiple discharge pipes 35. Ball valves 34 are installed on the discharge pipes 35 to control the opening and closing of the discharge pipes 35 and the flow rate of the slurry. Furthermore, the feed distributors 31 are horizontally fixed by a support frame 33 to ensure that the two feed distributors 31 are stably positioned on both sides above the scraper trough. The symmetrical arrangement of the two feed distributors 31 ensures that the slurry is evenly fed onto both sides above the scraper trough. The slurry entering through the feed pipe is distributed within the hollow feed distributor 31 and then stably discharged into the coating trough through multiple discharge pipes 35. This helps ensure the uniformity of coating supply during the coating process. The lateral fixing function of the support frame 33 is also crucial. It not only ensures the stability of the feed distributor 31 on both sides above the coating trough, but also prevents it from easily shifting even under vibration or external interference during equipment operation. This stability is significant for improving production efficiency and reducing product quality fluctuations. Furthermore, the arrangement of the multiple discharge pipes 35 can be rationally adjusted according to the specific dimensions of the coating trough and feeding requirements, further optimizing the uniformity of feeding.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-sided coating device suitable for alkaline water electrolysis to produce hydrogen diaphragms, characterized in that, include: A roller coating mechanism (1) includes a base assembly (14) and a coating roller group (11) disposed on the base assembly (14). The coating roller group (11) has two coating rollers (112) arranged side by side and rotating in opposite directions, and a roller coating gap is formed between the two coating rollers (112). The coating mechanism (2) includes a coating trough installed above the base assembly (14), the lower end of the coating trough having a coating gap, the coating gap being located directly above the roller coating gap; The feeding mechanism (3) includes a feeding distributor (31) installed above the scraper coating tank, the feeding distributor (31) being used to supply slurry into the scraper coating tank.

2. The double-sided coating device for a membrane suitable for alkaline water electrolysis to produce hydrogen as described in claim 1, characterized in that, A metering roller (111) is provided on the outside of the coating roller (112), and a metering gap is formed between the coating roller (112) and the metering roller (111). A slurry storage tank (4) is formed above the metering gap.

3. The double-sided coating device for a membrane used in alkaline water electrolysis for hydrogen production as described in claim 2, characterized in that, Bearing seats (113) are provided at both ends of the coating roller (112) and both ends of the metering roller (111). A plurality of bearing seats (113) are symmetrically arranged on both sides of the upper end of the base assembly (14). A drive motor (114) is provided on the outer side of the bearing seat (113) on either side. The drive motor (114) is connected to the coating roller (112) or the metering roller (111) through a reducer.

4. The double-sided coating device for a membrane used in alkaline water electrolysis for hydrogen production as described in claim 3, characterized in that, An inclined iron assembly (12) is provided between two adjacent bearing seats (113) on the same side. The inclined iron assembly (12) includes a fixed block (121), a sliding block (122), and a driving member. The fixed block (121) and the sliding block (122) are respectively disposed on two adjacent bearing seats (113). An inclined surface is formed between the fixed block (121) and the sliding block (122). The driving member is used to drive the sliding block (122) to slide along the inclined surface to adjust the distance between the two coating rollers (112) on the two adjacent bearing seats (113) or between the coating roller (112) and the metering roller (111).

5. The double-sided coating apparatus for a membrane suitable for alkaline water electrolysis to produce hydrogen as described in claim 4, characterized in that, The driving component includes a first fixed seat (123), a lead screw (124), and a handwheel (125). The first fixed seat (123) is fixed to the outer side of the bearing seat (113). The lead screw (124) is rotatably mounted on the first fixed seat (123). One end of the lead screw (124) abuts against the sliding block (122). The handwheel (125) is located at the other end of the lead screw (124).

6. The double-sided coating apparatus for a membrane used in alkaline water electrolysis for hydrogen production as described in claim 3, characterized in that, The slurry storage tank (4) is provided with baffle plates (133) on both sides respectively. The lower end of the baffle plate (133) conforms to the inside of the slurry storage tank (4) to seal both ends. The baffle plate (133) is installed on the bearing seat (113) on the corresponding side.

7. The double-sided coating apparatus for a diaphragm suitable for alkaline water electrolysis to produce hydrogen as described in claim 6, characterized in that, A light axis (132) is vertically inserted through the baffle plate (133), and a second fixing seat (131) is fixed at the end of the light axis (132). The second fixing seat (131) is fixed to the inner side of the bearing seat (113).

8. The double-sided coating apparatus for a membrane used in alkaline water electrolysis for hydrogen production as described in claim 3, characterized in that, The base assembly (14) includes a bottom frame and mounting portions disposed on both sides of the bottom frame, the mounting portions being used to slidably mount a plurality of the bearing seats (113) on the corresponding sides.

9. A double-sided coating apparatus for a diaphragm suitable for alkaline water electrolysis to produce hydrogen, as described in claim 8, characterized in that, The mounting part is provided with clamping parts on the front and rear sides for positioning multiple bearing seats (113) on the same side in the front and rear directions. The bottom frame is provided with fixing blocks (143) on the left and right sides for fixing the position of the bearing seats (113) corresponding to the coating roller (112). The middle part of the left and right sides of the bottom frame is provided with limiting blocks (142) for limiting the distance between the bearing seats (113) corresponding to two coating rollers (112) on the same side.

10. The double-sided coating apparatus for a membrane used in alkaline water electrolysis for hydrogen production as described in claim 1, characterized in that, Two feeding distributors (31) are symmetrically arranged on the front and rear sides above the scraper coating trough. Multiple discharge pipes (35) are arranged in sequence on the side of the feeding distributor (31) closer to the scraper coating trough, and a feed pipe is arranged in the middle on the side of the feeding distributor (31) away from the scraper coating trough.

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