A coating machine for producing composite diaphragms for alkaline water electrolysis hydrogen production

Abstract

The invention relates to a coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis. The coating machine comprises a coaxially arranged unwinding roller, a winding roller, a spray pipe and a plurality of supporting rollers. The spray pipe is driven to rotate at a high speed by a supergravity motor, so as to drive the entire coating machine to produce a supergravity environment. Under the action of supergravity, the coating is sprayed out through the spray pipe and evenly coated on the surface of the composite diaphragm to form a dense and uniform coating. The supporting roller supports the composite diaphragm to prevent its deformation. The rotation of the unwinding roller and the winding roller is controlled by a winding motor to realize continuous coating of the composite diaphragm. The excess coating generated during the coating process is collected and recycled through a reflux hole. The unwinding roller and the winding roller are provided with a hollow structure and an internal piston, and dynamic balance is achieved in cooperation with a balancing cylinder and an adjusting oil cylinder to ensure that the coating process is carried out smoothly. The supergravity motor is vibration-reduced by an independent suspension, and the outer box body is arranged in a closed manner, which is conducive to the stable operation and clean production of the coating machine.

Description

Technical Field

[0001] The invention relates to a coating machine for producing a composite diaphragm for producing hydrogen by alkaline water electrolysis, and in particular to a coating machine for producing a composite diaphragm for producing hydrogen by alkaline water electrolysis, which is applied in the technical field of coating machines. Background Art

[0002] Alkaline water electrolysis to produce hydrogen is a promising clean hydrogen production technology. The preparation quality of its core component, the composite diaphragm, directly affects the performance and life of the electrolyzer. Traditional composite diaphragms are mostly coated manually or with simple coating equipment, which has problems such as low coating efficiency and unstable coating quality, making it difficult to meet the needs of industrial production.

[0003] Chinese invention patent CN108620272B discloses a coating machine that uses a soft backing roller in conjunction with a coating roller to achieve coating on a base film. The device can achieve uniform coating of the base film through the contact and extrusion effect of the soft backing roller and the coating roller, and by replacing the soft backing roller and the coating roller of different lengths, it can adapt to the coating requirements of base films of different widths. However, the coating machine still belongs to intermittent production, with limited production efficiency, and the coating process is easily affected by factors such as equipment vibration and changes in substrate tension, and the coating quality and thickness consistency are difficult to guarantee.

[0004] Chinese invention patent CN114345650B discloses a coating machine, which is provided with a solution chamber, a film tension adjustment mechanism, a swing arm limit mechanism, a solution replenishment mechanism and a film limit mechanism. Through the cooperation of multiple mechanisms, functions such as film tension adjustment and coating liquid replenishment can be realized to ensure the stability and reliability of the coating process. However, the structure of the coating machine is relatively complex, involving the coordination of multiple mechanisms, and the assembly and debugging are difficult. In addition, the meshing gap between the mechanisms is easy to introduce coating defects, and there is still room for further improvement in the coating quality.

[0005] Although the above-mentioned existing technologies have solved the problems of uniformity and stability in the coating process to a certain extent, they still have shortcomings in production efficiency, coating quality, equipment compactness, etc., and it is difficult to fully meet the requirements of mass production of alkaline water electrolysis hydrogen production composite diaphragms. With the rapid development of fuel cell technology, it is urgent to develop an efficient, high-quality, compact composite diaphragm coating equipment to promote the industrialization process of water electrolysis hydrogen production technology. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to use ultra-gravity coating technology to achieve continuous preparation of composite diaphragms, so as to improve coating efficiency and make the coating dense and uniform.

[0007] In order to solve the above problems, the present invention provides a coating machine for the production of composite diaphragms for hydrogen production by alkaline water electrolysis, comprising a symmetrically arranged unwinding roller and a winding roller, an upper fixed disk and a lower fixed disk symmetrically arranged up and down are arranged between the symmetrically arranged unwinding roller and the winding roller, a spray pipe is rotatably connected in the center between the upper fixed disk and the lower fixed disk symmetrically arranged up and down, a retaining tube is fixedly connected between the upper fixed disk and the lower fixed disk symmetrically arranged up and down, a plurality of supporting rollers are rotatably connected between the upper fixed disk and the lower fixed disk, the plurality of supporting rollers are distributed in a circular array around the axis of the spraying tube, the same composite diaphragm is wound on the unwinding roller and the winding roller, the ends of the plurality of supporting rollers close to each other are arranged in contact with the composite diaphragm, and the composite diaphragm is wound on the plurality of supporting rollers. The ends of the rollers that are close to each other are staggered and wound one or more times, and the two ends after winding are respectively wound on the outer ends of the unwinding roller and the winding roller, the upper fixed disk, the lower fixed disk and the outer end of the baffle tube are fixedly connected with the inner box body, the lower fixed disk is located between the inner wall of the baffle tube and the outer wall of the spray tube, and a plurality of reflux holes that penetrate the lower fixed disk are opened, the inner box body is a hollow structure, and the hollow part is connected with the bottom end of the reflux hole, the bottom end of the spray tube penetrates the inner box body, and the penetrated part is connected to the external high-pressure feeding system, the bottom end of the inner box body and the corresponding positions of the unwinding roller and the winding roller are fixedly connected with a winding motor, and the power shaft of the winding motor penetrates the inner box body and is fixedly connected with the corresponding unwinding roller and the winding roller, and the outer wall of the bottom end of the spray tube is fixedly connected with an ultra-gravity motor.

[0008] In the coating machine for the production of the above-mentioned alkaline water electrolysis hydrogen production composite diaphragm, under the action of supergravity, the coating is sprayed out through the spray pipe and evenly coated on the surface of the composite diaphragm to form a dense and uniform coating. The composite diaphragm is supported by the support roller to prevent the diaphragm from deformation. The winding motor controls the rotation of the unwinding roller and the winding roller to achieve continuous coating of the composite diaphragm. The excess coating generated during the coating process is collected and reused through the built-in reflux device. The unwinding roller and the winding roller are equipped with hollow structures and pistons, and cooperate with the hydraulic balancing system to achieve dynamic balance during the coating process.

[0009] As a further improvement of the present application, the unwinding roller and the winding roller are both hollow structures, and pistons are slidably connected inside the hollow structures of the unwinding roller and the winding roller. Breathing holes are provided at the bottom ends of the unwinding roller and the winding roller, and openings are provided at positions corresponding to the inner box and the composite film.

[0010] As a further improvement of the present application, a balancing cylinder is fixedly connected to the top end of the inner box body, and a connecting pipe 1 and a connecting pipe 2 are fixedly connected to the top end and the bottom end of the balancing cylinder respectively.

[0011] As a further improvement of the present application, connecting pipe 1 and connecting pipe 2 are fixedly connected to the top of the unwinding roller and the winding roller at one end away from the balancing cylinder, and connecting pipe 1 and connecting pipe 2 are respectively connected to the hollow parts of the unwinding roller and the winding roller, and a balancing piston is slidably connected in the balancing cylinder.

[0012] As another improvement of the present application, the balancing cylinder is filled with liquid, the liquid is hydraulic oil or water, and an adjusting oil cylinder is fixedly connected to the top of the balancing cylinder.

[0013] As another improved supplement of the present application, the balancing piston penetrates upwardly through the top of the balancing cylinder and extends upwardly into the adjusting oil cylinder, and the extended portion is fixedly connected to the adjusting oil cylinder piston, and the adjusting oil cylinder is a double-acting hydraulic cylinder.

[0014] As another improvement supplement of the present application, through holes are opened on the outer wall of the adjusting cylinder near the top and the bottom, and hydraulic adapter rings are rotatably connected to the outer wall of the adjusting cylinder and the corresponding positions of the through holes, and the multiple hydraulic adapter rings are connected to the external hydraulic system.

[0015] As another improvement of the present application, the outer ends of the unwinding roller, the winding roller, the spray pipe and the balance cylinder are fixedly connected to the same outer box body, the outer box body is an elliptical structure, and the major axis of the ellipse coincides with the line connecting the unwinding roller and the winding roller.

[0016] The top of the adjusting cylinder is fixedly connected to the oil shaft, and the shaft is rotatably connected to a base, the bottom of the base is fixedly connected to the outer end of the supergravity motor, the bottom of the inner box body penetrates the bottom of the outer box body, and the penetrating part is rotatably connected to a recovery ring, which is connected to an external residual material recovery system.

[0017] A coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis, and a method for using the coating machine comprises the following steps:

[0018] S1. Place the composite membrane roll to be coated on the outer end of the unwinding roller, stretch the composite membrane into between the spray tube and the support roller, and wind it the required number of turns, then wind the composite membrane away from the unwinding roller to the outer end of the winding roller to complete the installation of the composite membrane;

[0019] S2. The spray pipe is driven to rotate by the supergravity motor, and at the same time, the upper fixed plate, the lower fixed plate, the baffle pipe, the support roller, the inner box, the winding motor, the balance cylinder, the connecting pipe 1, the connecting pipe 2, the balance piston, the regulating oil cylinder, the outer box and the recovery ring are driven to rotate together, and a microgravity or supergravity environment is generated during the rotation process;

[0020] S3. In a supergravity environment, the paint is sprayed out from the spray pipe through an external high-pressure feeding system, so that the paint is evenly distributed on the composite diaphragm. The excess paint flows from the composite diaphragm through the reflux hole into the inner box and is recovered through the recovery ring;

[0021] S4. During the coating process, the unwinding roller and the winding roller are driven by the winding motors on the unwinding roller and the winding roller to rotate respectively, so that the composite diaphragm is slowly transferred from the outer end of the unwinding roller to the outer end of the winding roller;

[0022] S5. During the transfer of the composite diaphragm, the piston in the regulating oil cylinder is pushed to move by the external hydraulic system, driving the balancing piston to squeeze the liquid in the balancing cylinder into the inner cavity of the unwinding roller or the winding roller through the connecting pipe 1 or the connecting pipe 2, pushing the internal piston to move to balance the weight difference between the two, wherein:

[0023] When the liquid enters the inner cavity of the unwinding roller, it pushes the internal piston to move toward the end away from the composite diaphragm;

[0024] When the liquid enters the inner cavity of the winding roller, it pushes the internal piston to move toward the end close to the composite diaphragm.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. Supergravity coating technology: A supergravity motor is used to drive the spray tube to rotate at high speed, driving the coating machine as a whole to create a supergravity environment. Supergravity is used to evenly spray and penetrate the coating onto the surface of the composite diaphragm, effectively avoiding defects such as pinholes and wrinkles in the coating. The coating quality is high and the coating is dense and uniform. At the same time, the composite diaphragm is supported by support rollers to prevent it from deforming under high-speed rotation and supergravity, ensuring uniform tension of the composite diaphragm during the coating process, and further improving the coating quality and coating uniformity.

[0027] 2. Continuous coating method: The unwinding roller and the winding roller are controlled by the winding motor to rotate at a low speed, driving the composite diaphragm to slowly pass under the spray tube, so as to realize the continuous coating of the coating on the surface of the composite diaphragm. This coating method has high efficiency, stable and controllable process, good coating thickness consistency, and the key components of the coating machine adopt a compact coaxial design with reasonable layout, high transmission efficiency and easy use and maintenance.

[0028] 3. Paint recovery and hydraulic balancing system: Utilize the gap between the composite diaphragm and the support roller and the reflux holes on the inner box to collect excess paint during the coating process into the inner box under the action of supergravity, and introduce the external residual material recovery system through the recovery ring to improve the utilization rate of paint and reduce waste and pollution. Set a hollow structure and an internal piston on the unwinding roller and the winding roller, and use the balance cylinder and the adjustment cylinder to continuously replenish oil to the inner cavity to dynamically offset the weight difference between the two rollers caused by the transfer of the composite diaphragm, so as to achieve dynamic balance between the unwinding roller and the winding roller during the coating process, ensure the smooth coating process, and improve the uniformity of the coating thickness. After the coating is completed, use the breathing holes at the bottom of the unwinding roller and the winding roller to automatically discharge the hydraulic oil in the inner cavity and recycle it, which is environmentally friendly, efficient and saves resources.

[0029] 4. Vibration reduction, isolation and clean production: The ultra-gravity motor is connected to the adjusting cylinder through the base and the oil shaft to achieve independent suspension between the coating machine body, effectively reducing the impact of the vibration generated by the high-speed rotation of the ultra-gravity motor on the coating machine body, ensuring a smooth coating process and further improving the coating quality. The key components of the coating machine are enclosed in an elliptical outer box with good integrity, effectively blocking the waste gas and waste liquid generated during the coating process, making it easy to achieve clean production in the coating workshop and convenient for the movement and installation of the entire coating machine.

[0030] 5. Automated and continuous production: The coating machine realizes the automation and continuity of the production process of alkaline water electrolysis hydrogen production composite diaphragm, with high production efficiency, stable coating quality, and excellent coating performance. It can well meet the industrial production needs of composite diaphragms for fuel cells. The entire coating process realizes the automated control and continuous operation of links such as paint spraying, coating formation, residual material recovery, and dynamic balance, which greatly improves the production efficiency of composite diaphragms and the consistency of product performance, and provides strong equipment support for the industrialization of fuel cell diaphragms. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the overall structure diagram of this application;

[0032] Figure 2 This is an overall exploded view of this application;

[0033] Figure 3 Partial explosion for this application Figure 1 ;

[0034] Figure 4 Partial explosion for this application Figure 2 ;

[0035] Figure 5 Partial explosion for this application Figure 3 ;

[0036] Figure 6 Partial explosion for this application Figure 4 ;

[0037] Figure 7 Partial explosion for this application Figure 5 ;

[0038] Figure 8 Partial explosion for this application Figure 6 ;

[0039] Fig. 9 This is the front view of the application;

[0040] Fig.10 For this application Fig. 9 Middle AA section view;

[0041] Fig.11 For this application Fig.10 Middle BB section view;

[0042] Fig.12 This is the appearance structure diagram of this application.

[0043] Description of the numbers in the figure:

[0044] 1. Unwinding roller; 2. Rewinding roller; 3. Upper fixed plate; 4. Lower fixed plate; 5. Spraying tube; 6. Stop tube; 7. Support roller; 8. Inner box; 9. Reflux hole; 10. Winding motor; 11. Super gravity motor; 12. Balance cylinder; 13. Connecting pipe 1; 14. Connecting pipe 2; 15. Balance piston; 16. Adjusting cylinder; 17. Hydraulic adapter ring; 18. Outer box; 19. Recovery ring. DETAILED DESCRIPTION

[0045] Three embodiments of the present application are described in detail below with reference to the accompanying drawings. Example

[0046] like Figures 1 to 12 As shown, the present embodiment provides a coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis, comprising a symmetrically arranged unwinding roller 1 and a winding roller 2, both of which are cylindrical structures, and the axes of the two are parallel, and a disc-shaped upper fixed plate 3 and a lower fixed plate 4 symmetrically arranged up and down are provided between the unwinding roller 1 and the winding roller 2, and through holes are opened at the center positions of the upper fixed plate 3 and the lower fixed plate 4, and a cylindrical spray pipe 5 is rotatably connected between the upper fixed plate 3 and the lower fixed plate 4, and the axis of the spray pipe 5 is parallel to the unwinding roller 1 and the winding roller 2. The axes of the winding rollers 2 are parallel, and both ends of the spray tube 5 pass through the upper fixed disk 3 and the lower fixed disk 4 respectively and extend to the outside of the upper fixed disk 3 and the lower fixed disk 4, and a cylindrical retaining tube 6 is fixedly connected between the upper fixed disk 3 and the lower fixed disk 4, the inner diameter of the retaining tube 6 is larger than the outer diameter of the spray tube 5, and the axis of the retaining tube 6 coincides with the axis of the spray tube 5, and 8 cylindrical support rollers 7 are evenly connected and rotated between the upper fixed disk 3 and the lower fixed disk 4, and the 8 support rollers 7 are distributed in a circular array around the axis of the spray tube 5, and the axis of the support roller 7 is parallel to the axis of the spray tube 5.

[0047] The outer ends of the unwinding roller 1 and the winding roller 2 are respectively wound with two ends of the same composite diaphragm, the middle area of ​​the composite diaphragm is located between the spray tube 5 and the 8 support rollers 7, and the composite diaphragm is close to the end of the support rollers 7 that are close to each other. In the specific implementation, one end of the composite diaphragm can be first fixed on the unwinding roller 1, and then the composite diaphragm can be stretched to pass through the gap between two adjacent support rollers 7 in turn, and wound 4 times in an staggered manner, and finally the other end of the composite diaphragm is fixed on the winding roller 2.

[0048] The upper fixed disk 3, the lower fixed disk 4 and the outer ends of the retaining tube 6 in this embodiment are fixedly connected to a cylindrical inner box 8, the axis of the inner box 8 coincides with the axis of the spray tube 5, and the lower fixed disk 4 is located in the area between the inner wall of the retaining tube 6 and the outer wall of the spray tube 5, and 8 reflux holes 9 distributed in a circumferential array are opened, the hollow part of the inner box 8 is connected to the bottom end of the reflux hole 9, the bottom end of the spray tube 5 passes through the bottom end of the inner box 8 and extends to the outside of the inner box 8, and the extended part is connected to the external high-pressure feeding system through a hose, and two winding motors 10 are also fixedly connected to the bottom end of the inner box 8, and the two winding motors 10 are respectively used to drive the unwinding roller 1 and the winding roller 2 to rotate, and the power output shafts of the two winding motors 10 both pass through the bottom end of the inner box 8 and extend to the inside of the inner box 8 and are coaxially fixedly connected to the corresponding unwinding roller 1 and the winding roller 2, and an ultra-gravity motor 11 is also fixedly connected to the outer wall of the bottom end of the spray tube 5, and the ultra-gravity motor 11 is used to drive the spray tube 5 to rotate.

[0049] Working process

[0050] When in use, start the supergravity motor 11 to drive the spray tube 5 to rotate at high speed, and at the same time, the inner box 8, the upper fixed disk 3, the lower fixed disk 4, the baffle 6, the support roller 7 and the composite diaphragm also rotate at high speed. The entire coating machine will generate supergravity during the rotation process, start the high-pressure feeding system, and spray the paint from the paint nozzle on the spray tube 5 under high pressure. The sprayed paint is evenly sprayed onto the outer surface of the composite diaphragm under the action of supergravity. During the coating process, by controlling the rotation speed of the two winding motors 10, the unwinding roller 1 and the winding roller 2 are driven to rotate at a low speed, so that the composite diaphragm can slowly move from the unwinding roller 1 to the winding roller 2 until the coating is completed. During the coating process, the excess paint will be thrown out through the gap between the composite diaphragm and the support roller 7 under the action of supergravity, and the thrown paint will enter the inner box 8 through the reflux hole 9 on the lower fixed disk 4, and finally be discharged and collected through the discharge port.

[0051] The super gravity motor 11 is used to drive the spray pipe 5 to rotate at a high speed to generate super gravity, and the coating is evenly sprayed onto the surface of the composite diaphragm by utilizing the effect of super gravity, so that the coating uniformity is good.

[0052] The winding motor 10 is used to drive the unwinding roller 1 and the winding roller 2 to rotate, so that the composite diaphragm can move slowly during the coating process, the coating efficiency is high, and continuous production can be achieved.

[0053] The support roller 7 is used to support the composite diaphragm to prevent the composite diaphragm from being deformed under high-speed rotation and extreme gravity, which is beneficial to improving the coating quality.

[0054] A reflux hole 9 is provided on the lower fixed plate 4 and communicated with the inner box 8, and excess paint is thrown out and collected by utilizing super gravity, so that the paint utilization rate is high and waste is reduced.

[0055] The entire coating machine has a compact structure, reasonable layout, easy operation, high coating efficiency, and good coating quality, and can meet the continuous production needs of alkaline water electrolysis hydrogen production composite diaphragms. Example

[0056] like Figures 1 to 12 As shown, on the basis of Example 1, the unwinding roller 1 and the winding roller 2 in this embodiment are both hollow structures, the inner cavities of the unwinding roller 1 and the winding roller 2 are both cylindrical, and a cylindrical piston is slidably connected in the hollow structures of the unwinding roller 1 and the winding roller 2, and a breathing hole is provided at the bottom end of the unwinding roller 1 and the winding roller 2, which are respectively used to connect the inner cavities of the unwinding roller 1 and the winding roller 2 with the outside atmosphere, and a rectangular opening is also provided on the inner box 8 corresponding to the position of the composite film, so that the coated composite film can pass through the inner box 8.

[0057] A cylindrical balancing cylinder 12 is also fixedly connected to the top of the inner box body 8, and the axis of the balancing cylinder 12 coincides with the axis of the inner box body 8. The top and bottom ends of the balancing cylinder 12 are respectively fixedly connected with a connecting pipe 13 and a connecting pipe 2 14 through pipelines. The ends of the connecting pipe 13 and the connecting pipe 2 14 away from the balancing cylinder 12 are coaxially fixedly connected to the tops of the unwinding roller 1 and the winding roller 2 respectively, and the inner cavity of the connecting pipe 13 is connected to the hollow structure of the unwinding roller 1, and the inner cavity of the connecting pipe 2 14 is connected to the hollow structure of the winding roller 2. A balancing piston 15 is also slidably connected in the balancing cylinder 12.

[0058] The balancing cylinder 12 is filled with hydraulic oil, and an adjusting cylinder 16 is fixedly connected to the top of the balancing cylinder 12. The balancing piston 15 penetrates the balancing cylinder 12 upward and extends into the adjusting cylinder 16, and the extending part is fixedly connected to the piston rod of the adjusting cylinder 16. The adjusting cylinder 16 is a double-acting hydraulic cylinder, and through holes are provided on the outer wall of the adjusting cylinder 16 near the top and the bottom. A hydraulic adapter ring 17 is rotatably connected to the outer wall of the adjusting cylinder 16 at the through holes, and the two hydraulic adapter rings 17 are respectively connected to the oil inlet and the oil return port of the external hydraulic system.

[0059] In this embodiment, the unwinding roller 1, the winding roller 2, the spray pipe 5 and the balance cylinder 12 are all fixedly connected to the same elliptical outer box body 18, and the major axis of the outer box body 18 coincides with the connecting line of the unwinding roller 1 and the winding roller 2. The top of the adjusting oil cylinder 16 is also fixedly connected to an oil rotating shaft, and a base is rotatably connected to the oil rotating shaft. The bottom end of the base is fixedly connected to the outer end of the supergravity motor 11, and the bottom end of the inner box body 8 passes through the bottom end of the outer box body 18 and extends to the outside of the outer box body 18, and the extended part is fixedly connected to a recovery ring 19 through a rotating joint, and the recovery ring 19 is connected to the external waste material recovery system through a hose.

[0060] Working process

[0061] During the coating process, as the composite film gradually transfers from the unwinding roller 1 to the winding roller 2, the composite film on the unwinding roller 1 decreases and the composite film on the winding roller 2 increases, resulting in a change in the weight of the two, which in turn affects the overall balance performance of the coating machine. For this reason, during the coating process of this embodiment, the external hydraulic system continuously supplies oil to the inner cavity of the regulating cylinder 16. Under the action of the hydraulic oil, the regulating cylinder 16 drives the balancing piston 15 to continuously squeeze the hydraulic oil into the inner cavity of the balancing cylinder 12. Since the inner cavity of the balancing cylinder 12 is respectively connected to the inner cavity of the unwinding roller 1 and the inner cavity of the winding roller 2, the hydraulic oil squeezed out by the balancing piston 15 will simultaneously enter the inner cavity of the unwinding roller 1 The hydraulic oil flows into the inner cavity of the unwinding roller 1 and the inner cavity of the winding roller 2, thereby pushing the pistons in the inner cavities of the unwinding roller 1 and the winding roller 2 to move. As the composite film is rolled out from the unwinding roller 1, the volume of the inner cavity of the unwinding roller 1 increases. Therefore, after the hydraulic oil enters the inner cavity of the unwinding roller 1, it pushes the internal piston thereof to move toward the end away from the composite film; and as the composite film is rolled into the winding roller 2, the volume of the inner cavity of the winding roller 2 decreases. Therefore, after the hydraulic oil enters the inner cavity of the winding roller 2, it pushes the internal piston thereof to move toward the end close to the composite film. By continuously filling the inner cavities of the unwinding roller 1 and the winding roller 2 with hydraulic oil, a dynamic balance of weight between the unwinding roller 1 and the winding roller 2 can be achieved, thereby ensuring a smooth coating process.

[0062] After coating is completed, the external hydraulic system stops supplying oil and opens the oil return valve. Under the reset action of the piston rod of the regulating cylinder 16, the hydraulic oil in the balance cylinder 12 is discharged through the breathing holes at the bottom ends of the unwinding roller 1 and the winding roller 2. The discharged hydraulic oil enters the external residual material recovery system through the recovery ring 19 to achieve the recovery of the hydraulic oil.

[0063] The unwinding roller 1 and the winding roller 2 adopt a hollow structure with pistons arranged inside. The inner cavities of the unwinding roller 1 and the winding roller 2 are continuously filled with hydraulic oil, so that the dynamic balance of weight between the unwinding roller 1 and the winding roller 2 can be achieved, ensuring a smooth coating process.

[0064] A balancing cylinder 12 and an adjusting oil cylinder 16 are provided, and a hydraulic system is used to automatically adjust the weight balance between the unwinding roller 1 and the winding roller 2. The structure is simple, the control is precise, and the implementation difficulty is low.

[0065] The balance cylinder 12 is connected to the unwinding roller 1 and the winding roller 2 through the connecting pipe 13 and the connecting pipe 2 14, and the hydraulic oil is synchronously squeezed into the inner cavity of the unwinding roller 1 and the winding roller 2 by the balance piston 15, so as to realize the synchronous and balanced movement of the pistons in the unwinding roller 1 and the winding roller 2, and the weight adjustment accuracy is high.

[0066] The breathing hole and the recovery ring 19 are provided to realize the automatic discharge and recovery of the hydraulic oil after the coating is completed, thereby avoiding the waste of resources.

[0067] The oval outer box 18 is used to enclose the components, which has good integrity and is convenient for moving and installing the whole machine. The supergravity motor 11 is connected to the adjusting cylinder 16 through the base and the oil shaft to achieve independent suspension between the supergravity motor 11 and the coating machine body, avoiding the vibration generated by the high-speed rotation of the supergravity motor 11 affecting the coating quality. Example

[0068] like Figures 1 to 12 shown.

[0069] S1. Place the composite diaphragm roll to be coated on the outer end of the unwinding roller 1, stretch the composite diaphragm into between the spray tube 5 and the support roller 7, and wind it 3-5 times, then wind the end of the composite diaphragm away from the unwinding roller 1 to the outer end of the winding roller 2 to complete the installation of the composite diaphragm on the coating machine.

[0070] S2. Start the supergravity motor 11 to drive the spray pipe 5 to rotate at a high speed of 3000-5000r / min. At the same time, the upper fixed plate 3, the lower fixed plate 4 and the retaining pipe 6 drive the support roller 7, the inner box 8, the winding motor 10, the balance cylinder 12, the connecting pipe 13, the connecting pipe 2 14, the balance piston 15, the adjusting cylinder 16, the outer box 18 and the recovery ring 19 to rotate synchronously with the spray pipe 5 at a high speed, thereby generating a supergravity environment of 5-10 times gravity inside the coating machine.

[0071] S3. Under the supergravity environment, open the valve of the external high-pressure feeding system, and spray the paint from the paint nozzle on the spray pipe 5 at a pressure of 0.2-0.5MPa. Under the action of supergravity, the paint is evenly sprayed on the outer surface of the composite diaphragm. At the same time, the excess paint is thrown out through the gap between the composite diaphragm and the support roller 7 under the action of supergravity, enters the inner box 8 through the reflux hole 9, and finally enters the external residual material recovery system through the recovery ring 19.

[0072] S4. After coating starts, the winding motor 10 on the unwinding roller 1 and the winding roller 2 is controlled to rotate at a low speed of 1-5r / min, so that the composite diaphragm moves slowly from the unwinding roller 1 to the winding roller 2 at a speed of 10-50mm / min to achieve continuous coating.

[0073] S5. During the transfer of the composite diaphragm, the composite diaphragm is continuously unwound from the unwinding roller 1 and wound onto the winding roller 2, resulting in a dynamic change in the weight of the two rollers. To balance this weight difference, the external hydraulic system continuously supplies oil to the regulating cylinder 16, pushing the piston in the regulating cylinder 16 downward, thereby pushing the balancing piston 15 connected thereto to squeeze the hydraulic oil into the inner cavity of the balancing cylinder 12. Under the action of the balancing piston 15, the hydraulic oil in the balancing cylinder 12 continuously enters the hollow inner cavity of the unwinding roller 1 through the connecting pipe 13, pushing the piston inside the unwinding roller 1 to move toward the end away from the composite diaphragm; at the same time, another part of the hydraulic oil in the balancing cylinder 12 enters the inner cavity of the winding roller 2 through the connecting pipe 2 14, pushing the piston inside the winding roller 2 to move toward the end close to the composite diaphragm. Through this dynamic compensation effect, the volume of the hydraulic oil in the inner cavities of the unwinding roller 1 and the winding roller 2 continuously changes, thereby offsetting the weight difference between the two rollers caused by the transfer of the composite diaphragm, and achieving a dynamic balance between the unwinding roller 1 and the winding roller 2 during the coating process.

[0074] After coating is completed, the external hydraulic system is turned off, and the breathing holes at the bottom of the unwinding roller 1 and the winding roller 2 are opened. During the reverse transfer of the composite diaphragm, the hydraulic oil in the inner cavity of the unwinding roller 1 and the winding roller 2 is discharged through the breathing holes under the push of the internal piston reset and finally enters the external residual material recovery system.

[0075] The coating machine body is rotated at high speed by an ultra-gravity motor 11, and an ultra-gravity environment is formed inside the coating machine. The ultra-gravity is used to evenly spray and penetrate the coating into the surface of the composite diaphragm, so that the coating effect is good, the coating is dense and uniform, and it is not easy to produce coating defects such as pinholes and wrinkles.

[0076] The unwinding roller 1 and the winding roller 2 are driven to rotate at a low speed by the winding motor 10, and the composite diaphragm is driven to slowly pass under the spray tube 5, so that continuous coating of the composite diaphragm can be achieved, the coating efficiency is high, and the coating process is stable and controllable.

[0077] A hollow structure and an internal piston are provided in the unwinding roller 1 and the winding roller 2, and oil is continuously added to the inner cavities of the unwinding roller 1 and the winding roller 2 by means of the balancing cylinder 12 and the regulating oil cylinder 16 to offset the weight change of the two rollers caused by the transfer of the composite diaphragm, thereby achieving a dynamic balance between the unwinding roller 1 and the winding roller 2 during the coating process, so that the coating process proceeds smoothly and the coating thickness consistency is good.

[0078] By utilizing the gap between the composite diaphragm and the support roller 7 and the reflux hole 9 on the inner box 8, the excess paint generated during the coating process is collected into the inner box 8 under the action of supergravity, and introduced into the external residual material recovery system through the recovery ring 19, so that the paint utilization rate is high and waste and pollution are reduced.

[0079] After coating is completed, while the composite diaphragm is transferred in the reverse direction, the hydraulic oil in the inner cavity is automatically discharged and recovered through the breathing holes at the bottom of the unwinding roller 1 and the winding roller 2, realizing the closed-loop utilization of the hydraulic system oil, saving resources, being environmentally friendly and efficient.

[0080] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis, characterized in that: The invention comprises an unwinding roller (1) and a winding roller (2) which are symmetrically arranged on the left and right, an upper fixed disk (3) and a lower fixed disk (4) which are symmetrically arranged on the top and bottom are provided between the symmetrically arranged unwinding roller (1) and the winding roller (2), a spray pipe (5) is rotatably connected between the upper fixed disk (3) and the lower fixed disk (4) which are symmetrical on the top and bottom, a retaining tube (6) is fixedly connected between the upper fixed disk (3) and the lower fixed disk (4) which are symmetrical on the top and bottom, a plurality of supporting rollers (7) are rotatably connected between the upper fixed disk (3) and the lower fixed disk (4), the plurality of supporting rollers (7) are distributed in a circular array around the axis of the spray pipe (5), the unwinding roller (1) and the winding roller (2) are wound with the same composite diaphragm, the ends of the plurality of supporting rollers (7) which are close to each other are arranged in contact with the composite diaphragm, the composite diaphragm is staggeredly wound one or more turns around the ends of the plurality of supporting rollers (7) which are close to each other, and the two ends after winding are staggered. The ends are respectively wound around the outer ends of the unwinding roller (1) and the winding roller (2); the upper fixed disc (3), the lower fixed disc (4) and the outer ends of the retaining tube (6) are fixedly connected to an inner box body (8); the lower fixed disc (4) is located between the inner wall of the retaining tube (6) and the outer wall of the spraying tube (5) and is provided with a plurality of reflux holes (9) penetrating the lower fixed disc (4); the inner box body (8) is a hollow structure, and the hollow part is connected to the bottom end of the reflux hole (9); the bottom end of the spraying tube (5) penetrates the inner box body (8), and the penetrated part is connected to an external high-pressure feeding system; the bottom end of the inner box body (8) and the corresponding positions of the unwinding roller (1) and the winding roller (2) are fixedly connected to a winding motor (10), and the power shaft of the winding motor (10) penetrates the inner box body (8) and is fixedly connected to the corresponding unwinding roller (1) and the winding roller (2); the outer wall of the bottom end of the spraying tube (5) is fixedly connected to an ultra-gravity motor (11).

2. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The unwinding roller (1) and the winding roller (2) are both hollow structures, and pistons are slidably connected in the hollow structures of the unwinding roller (1) and the winding roller (2). Breathing holes are provided at the bottom ends of the unwinding roller (1) and the winding roller (2), and openings are provided at positions corresponding to the composite film in the inner box (8).

3. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 1, characterized in that: The top end of the inner box (8) is fixedly connected to a balancing cylinder (12), and the top end and bottom end of the balancing cylinder (12) are respectively fixedly connected to a connecting pipe 1 (13) and a connecting pipe 2 (14).

4. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 3, characterized in that: The connecting pipe 1 (13) and the connecting pipe 2 (14) are respectively fixedly connected to the top of the unwinding roller (1) and the top of the winding roller (2) at one end away from the balancing cylinder (12), and the connecting pipe 1 (13) and the connecting pipe 2 (14) are respectively connected to the hollow parts of the unwinding roller (1) and the winding roller (2), and a balancing piston (15) is slidably connected in the balancing cylinder (12).

5. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 4, characterized in that: The balancing cylinder (12) is filled with liquid, which is hydraulic oil or water. The top of the balancing cylinder (12) is fixedly connected to an adjusting oil cylinder (16).

6. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 5, characterized in that: The balancing piston (15) penetrates the top of the balancing cylinder (12) and extends upward into the regulating oil cylinder (16), and the extended portion is fixedly connected to the piston of the regulating oil cylinder (16). The regulating oil cylinder (16) is a double-acting hydraulic cylinder.

7. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 5, characterized in that: Through holes are provided at positions near the top and bottom of the outer wall of the regulating oil cylinder (16), and hydraulic adapter rings (17) are rotatably connected to positions corresponding to the through holes on the outer wall of the regulating oil cylinder (16), and a plurality of the hydraulic adapter rings (17) are connected to an external hydraulic system.

8. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 5, characterized in that: The outer ends of the unwinding roller (1), the winding roller (2), the spray pipe (5) and the balance cylinder (12) are all fixedly connected to the same outer box body (18); the outer box body (18) is an elliptical structure, and the major axis of the elliptical structure coincides with the line connecting the unwinding roller (1) and the winding roller (2).

9. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 8, characterized in that: The top end of the regulating oil cylinder (16) is fixedly connected to a rotating shaft, and a base is rotatably connected to the rotating shaft. The bottom end of the base is fixedly connected to the outer end of the supergravity motor (11). The bottom end of the inner box body (8) penetrates the bottom end of the outer box body (18), and a recovery ring (19) is rotatably connected to the penetrated portion. The recovery ring (19) is connected to an external waste material recovery system.

10. The coating machine for producing composite diaphragms for producing hydrogen by alkaline water electrolysis according to claim 9, characterized in that: The method of use includes the following steps: S1. Place the composite diaphragm roll to be coated on the outer end of the unwinding roller (1), stretch the composite diaphragm into between the spray tube (5) and the support roller (7), and wind it the required number of turns, then wind the composite diaphragm away from the unwinding roller (1) to the outer end of the winding roller (2), thereby completing the installation of the composite diaphragm; S2. The spray tube (5) is driven to rotate by the supergravity motor (11), and the upper fixed plate (3), the lower fixed plate (4), the retaining tube (6), the support roller (7), the inner box (8), the winding motor (10), the balance cylinder (12), the connecting tube 1 (13), the connecting tube 2 (14), the balance piston (15), the regulating cylinder (16), the outer box (18) and the recovery ring (19) are driven to rotate together, and a microgravity or supergravity environment is generated during the rotation process; S3. In a supergravity environment, the paint is sprayed from the spray pipe (5) through an external high-pressure feeding system so that the paint is evenly distributed on the composite diaphragm, and the excess paint flows from the composite diaphragm through the reflux hole (9) into the inner box (8) and is recovered through the recovery ring (19); S4. During the coating process, the unwinding roller (1) and the winding roller (2) are driven by the winding motors (10) on the unwinding roller (1) and the winding roller (2) to rotate respectively, so that the composite diaphragm is slowly transferred from the outer end of the unwinding roller (1) to the outer end of the winding roller (2); S5. During the transfer of the composite diaphragm, the piston in the regulating oil cylinder (16) is pushed by the external hydraulic system to move, driving the balancing piston (15) to squeeze the liquid in the balancing cylinder (12) through the connecting pipe 1 (13) or the connecting pipe 2 (14) into the inner cavity of the unwinding roller (1) or the winding roller (2), pushing the internal piston to move to balance the weight difference between the two, wherein: When the liquid enters the inner cavity of the unwinding roller (1), it pushes the internal piston to move toward the end away from the composite diaphragm; When liquid enters the inner cavity of the winding roller (2), it pushes the internal piston to move toward the end close to the composite diaphragm.

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