A production equipment and process for reverse osmosis membrane for pure water

Abstract

The invention discloses a production equipment and process for a reverse osmosis membrane for pure water, and relates to the field of coating technology. The invention comprises a feeding roller for supplying a substrate, and the substrate is wound up by a feeding roller after passing through a second guide roller, a water bath roller and a fourth guide roller in sequence; the water bath roller is rotatably arranged in a water bath tank; a spraying roller, a scraper assembly and an arc frame are arranged in sequence above the water bath roller according to the traveling direction of the substrate; the spraying roller is used for spraying a high molecular polymer solution onto the surface of the substrate to form a coating; the pretreatment assembly is used for spraying water mist and low-temperature gas onto the surface of the coating; the scraper assembly comprises: two symmetrically arranged first scrapers; two symmetrically arranged and mutually connected second scrapers, and the second scrapers are connected to the adjacent first scrapers respectively; the synergistic mechanism of the first scraper and the second scraper in the scraping treatment process has certain advantages for the reverse osmosis membrane production equipment, and the invention helps to ensure that the reverse osmosis membrane finally formed has uniform thickness and performance.

Description

Technical Field

[0001] The invention relates to the technical field of reverse osmosis membrane preparation, in particular to a production device and process for a reverse osmosis membrane for pure water. Background Art

[0002] In the field of industrial pure water production, the two main methods used are evaporation process and reverse osmosis membrane technology. Among them, the evaporation process, with its unique physical process, removes impurities through efficient evaporation to achieve the preparation of pure water. Although its energy consumption per ton of water reaches 40kw·h (equivalent to an electricity cost of about 28 yuan / ton), the reverse osmosis membrane technology applies a certain pressure to make water molecules pass through the membrane pores under the action of pressure difference. This process is relatively energy-saving.

[0003] Therefore, from the perspective of energy consumption, the energy consumption of preparing pure water by evaporation is usually higher than that of preparing pure water by reverse osmosis membrane. In addition, reverse osmosis membrane technology not only accurately removes various impurities in water, such as dissolved salts, colloidal particles, microorganisms and most organic matter, but also cleverly retains pure water molecules, ensuring the excellent quality of the industrial pure water produced, directly helping companies optimize production processes and reduce raw material consumption and wastewater treatment costs.

[0004] However, it is worth noting that in the production process of reverse osmosis membranes, the precise control of the spraying amount is directly related to the uniformity of the membrane layer and the quality of the final product. At present, due to the limitations of scraping processing technology and the instability of spraying amount, some reverse osmosis membranes have differences in quality, which affects their performance in practical applications.

[0005] Therefore, it is necessary to provide a production equipment and process for a pure water reverse osmosis membrane to solve the above problems. Summary of the invention

[0006] To solve the above problems, the present invention provides the following technical solutions: A production device for reverse osmosis membrane for pure water, comprising a feeding roller, which is used to supply a substrate, and the substrate is wound up by a feeding roller after passing through a second guide roller, a water bath roller, and a fourth guide roller in sequence;

[0007] Wherein, the water bath roller is rotatably arranged in a water bath tank, and water is pre-placed in the water bath tank for semi-immersing the water bath roller;

[0008] Wherein, a spraying roller, a scraper assembly, and an arc frame are sequentially arranged above the water bath roller according to the traveling direction of the substrate, and a pretreatment assembly is embedded in the arc frame;

[0009] The spray roller is used to spray a high molecular polymer solution onto the surface of the substrate to form a coating;

[0010] The pretreatment component is used to spray water mist and low-temperature gas onto the surface of the coating;

[0011] The scraper assembly includes a scraper group, and the scraper group includes:

[0012] Two first scrapers arranged symmetrically;

[0013] Two second scrapers which are symmetrically arranged and connected to each other, wherein the second scrapers are connected to adjacent first scrapers respectively;

[0014] Among them, the first scraper and the second scraper are both inclined, and the inclination direction of the first scraper is: gradually away from the spray roller from one end close to the center reference line to the other end, and the inclination direction of the second scraper is opposite to the inclination direction of the adjacent first scraper, and the center reference line is the center length direction of the substrate.

[0015] Further, preferably, the scraper assembly also includes a top frame, a deflection assembly is fixed to the bottom of the top frame, and the deflection assembly has a deflection end deflected around the Y direction, and the deflection end is connected to the first scraper or the second scraper.

[0016] Further, preferably, a pressure sensor is embedded in the second scraper;

[0017] Two third scrapers that are symmetrically arranged and connected to each other are vertically slidably provided on one side of the second scraper close to the spraying roller. The inclination direction of the third scraper is the same as the inclination direction of the adjacent first scraper. A lifting cylinder is also fixed on the second scraper. The lifting cylinder has a lifting end, and the lifting end is connected to the third scraper.

[0018] Further, preferably, the span of the scraper group is smaller than the length of the water bath roller, and a first distance exists between the end of the first scraper and the end of the water bath roller.

[0019] Further, preferably, two symmetrically arranged suction scraping grooves are fixed below the top frame, the suction scraping grooves are located on the side of the scraper assembly away from the spraying roller, and there is an overlapping area between the suction scraping grooves and the first scraper.

[0020] Further, preferably, the pre-processing component comprises:

[0021] An outer cylinder, which is fixedly embedded in the arc-shaped frame;

[0022] A nozzle, which is fixedly embedded in the bottom of the outer cylinder;

[0023] A spray head is fixedly embedded in the outer cylinder, and there is a gap between the spray head and the nozzle, and the spray head is used to spray the water mist.

[0024] Further, preferably, an annulus exists between the nozzle and the outer tube, the lower part of the annulus is connected to the gap, the upper part of the annulus is provided with a sealing sleeve connected between the outer tube and the nozzle, and one side of the outer tube is also provided with a gas supply hole connected to the annulus, and the gas supply hole is used to supply the low-temperature gas.

[0025] Furthermore, preferably, a drying component is provided between the fourth guide roller and the receiving roller, and the drying component is located below the substrate.

[0026] A production process of a reverse osmosis membrane for pure water comprises the following steps:

[0027] S1. The unloading roller continuously supplies the substrate, and the substrate is pressed against the surface of the water bath roller after being guided by the second guide roller;

[0028] S2. When the substrate enters under the spray roller, the spray roller starts to work, spraying the polymer solution onto the surface of the substrate to form a coating;

[0029] S3. The substrate continues to move and enters below the scraper assembly, and the first scraper and the second scraper control the thickness of the coating, wherein the first scraper guides the excess polymer solution to both ends of the water bath roller;

[0030] S4. After the scraping treatment, the pretreatment component sprays water mist and low-temperature gas on the surface of the coating;

[0031] S5. The substrate carries the stable polymer solution into the water bath roller to form a reverse osmosis membrane;

[0032] S6. The reverse osmosis membrane passes through the fourth guide roller for final guiding and flattening, and then is wound up by the take-up roller.

[0033] Compared with the prior art, the present invention provides a production device and process for a reverse osmosis membrane for pure water, which has the following beneficial effects:

[0034] The synergistic mechanism of the first scraper and the second scraper in the scraping process of the present invention has certain advantages for the reverse osmosis membrane production equipment. They work together in the entire production process through dynamic balance control, spraying amount replenishment mechanism, improving production stability and reliability, optimizing resource utilization and improving product quality, providing a strong guarantee for the production of high-quality reverse osmosis membranes.

[0035] The present invention is provided with a pretreatment component, which can provide low-temperature gas, which can stabilize the state of the polymer solution and prevent it from becoming uneven due to impact before entering the water body. This helps to ensure that the final reverse osmosis membrane has uniform thickness and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of a production equipment for reverse osmosis membrane for pure water;

[0037] Figure 2 It is a schematic diagram of the structure of a pretreatment component in a production device for a reverse osmosis membrane for pure water;

[0038] Figure 3 It is a rear view structural schematic diagram of a scraper assembly in a production device for a reverse osmosis membrane for pure water;

[0039] Figure 4 It is a three-dimensional structural schematic diagram of a scraper assembly in a production device for a reverse osmosis membrane for pure water;

[0040] Figure 5 It is a schematic diagram of the structure of a scraper group in a production device for a reverse osmosis membrane for pure water;

[0041] In the figure: 1. unloading roller; 2. first guide roller; 3. second guide roller; 4. spraying roller; 5. scraper assembly; 6. arc frame; 7. pretreatment assembly; 8. water bath; 9. water bath roller; 10. third guide roller; 11. fourth guide roller; 12. drying assembly; 13. receiving roller; 71. outer cylinder; 72. nozzle; 73. nozzle; 74. annulus; 75. sealing sleeve; 76. air supply hole; 51. top frame; 52. deflection assembly; 53. first scraper; 54. second scraper; 55. third scraper; 56. lifting cylinder; 57. suction scraper groove; 58. suction pipe; A. first distance; B. center reference line. DETAILED DESCRIPTION

[0042] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0043] Example: Please refer to Figure 1-Figure 5 In an embodiment of the present invention, a production device for a reverse osmosis membrane for pure water is provided, comprising a feeding roller 1 for feeding a substrate, wherein the substrate is successively passed through a second guide roller 3, a water bath roller 9, and a fourth guide roller 11 and then wound up by a feeding roller 13;

[0044] The water bath roller 9 is rotatably disposed in a water bath tank 8, and water is pre-placed in the water bath tank 8 for semi-immersing the water bath roller 9;

[0045] Semi-immersion means that the water bath roller 9 is extended and distributed along the Y direction, and the part below the central axis of the water bath roller 9 is immersed in the water in the water bath tank 8.

[0046] Wherein, a spraying roller 4, a scraper assembly 5, and an arc frame 6 are sequentially arranged above the water bath roller 9 according to the traveling direction of the substrate, and a pretreatment assembly 7 is embedded in the arc frame 6;

[0047] The spray roller 4 is used to spray the polymer solution onto the surface of the substrate to form a coating;

[0048] The pretreatment component 7 is used to spray water mist and low-temperature gas onto the surface of the coating;

[0049] The scraper assembly 5 includes a scraper group, and the scraper group includes:

[0050] Two first scrapers 53 are symmetrically arranged;

[0051] Two second scrapers 54 symmetrically arranged and connected to each other, wherein the second scrapers 54 are connected to adjacent first scrapers 53 respectively;

[0052] Among them, the first scraper 53 and the second scraper 54 are both inclined. The inclination direction of the first scraper 53 is: gradually away from the spray roller 4 from one end close to the center reference line B to the other end, and the inclination direction of the second scraper 54 is opposite to the inclination direction of the adjacent first scraper 53. The center reference line B is the center length direction of the substrate.

[0053] The implementation includes the following steps:

[0054] S1. The unloading roller 1 continuously supplies the substrate, and the substrate is pressed against the surface of the water bath roller 9 after being guided by the second guide roller 3;

[0055] S2. When the substrate enters below the spray roller 4, the spray roller 4 starts to work, spraying the polymer solution onto the surface of the substrate to form a coating;

[0056] S3. The substrate continues to move and enters below the scraper assembly 5, and the first scraper 53 and the second scraper 54 control the thickness of the coating, wherein the first scraper 53 guides the excess polymer solution to both ends of the water bath roller 9;

[0057] S4. After the scraping treatment, the pretreatment component 7 sprays water mist and low-temperature gas onto the surface of the coating;

[0058] S5. The substrate enters the water bath roller 9 with a stable polymer solution to form a reverse osmosis membrane;

[0059] S6. The reverse osmosis membrane is finally guided and flattened by the fourth guide roller 11 and then rolled up by the take-up roller 13.

[0060] In this embodiment, by using the first scraper 53 and the second scraper 54 in coordination, the distribution of the high molecular polymer solution on the substrate can be controlled to ensure the uniformity and consistency of the coating.

[0061] Specifically, the first scraper 53 and the second scraper 54 form a dynamic balance control mode during the scraping process.

[0062] Obviously, the main functions of the first scraper 53 and the second scraper 54 are to control the thickness of the coating. In addition, when the first scraper 53 is working, it can also guide the excess polymer solution to the two ends of the water bath roller 9, which is helpful for subsequent recovery.

[0063] In addition, the second scraper 54 can also prevent excessive high molecular polymer solution from continuing to flow to the two ends of the water bath roller 9, so as to ensure that a proper amount of excess high molecular polymer solution is retained in the middle of the substrate.

[0064] Specifically, when the spraying amount of the spraying roller 4 is insufficient, the second scraper 54 plays an especially important role. It can not only prevent the high molecular polymer solution from excessively flowing to the two ends, but also retain sufficient high molecular polymer solution in the middle area of ​​the substrate as a supplement to the spraying amount. This mechanism ensures that even if the spraying amount fluctuates, the distribution of the high molecular polymer solution on the substrate can still remain stable and uniform.

[0065] Of course, since the middle area retains enough high molecular polymer solution, the high molecular polymer solution can not only replenish the middle area of ​​the substrate, but also replenish the areas on both sides of the substrate.

[0066] Through this synergistic mechanism, the equipment can better cope with various changing factors in the production process, such as fluctuations in spraying volume, minor unevenness of the substrate, etc. This helps to improve the stability and reliability of production and reduce quality problems caused by changes in production conditions.

[0067] In addition, when the polymer solution enters the water bath 8, a diffusion effect occurs between the water in the water bath 8 and the polymer solution, so that the solvent in the polymer solution can diffuse into the water, and the water also diffuses into the polymer solution. Since the water is incompatible with the polymer solution, the polymer quickly solidifies into a film on the substrate.

[0068] In this embodiment, the scraper assembly 5 further includes a top frame 51 , a deflection assembly 52 is fixed to the bottom of the top frame 51 , and the deflection assembly 52 has a deflection end deflected around the Y direction, and the deflection end is connected to the first scraper 53 or the second scraper 54 .

[0069] In this embodiment, the deflection assembly 52 allows the first scraper 53 or the second scraper 54 (or both) to deflect around the Y direction. This deflection function allows the operator to fine-tune the distance between the scraper assembly and the water bath roller 9. Since a slight change in the distance will directly affect the residual amount of the polymer solution on the substrate, this fine-tuning capability is crucial for accurately controlling the coating thickness.

[0070] Different coating thicknesses may be required in different production batches or product types. The traditional fixed scraper design is difficult to meet such diverse needs. The deflection assembly 52 can easily adjust the scraper group position to adapt to different production requirements, thereby improving the flexibility and adaptability of the production line.

[0071] Precise coating thickness control helps reduce waste of polymer solution. If the coating is too thick, it will not only increase material costs, but may also cause performance problems for the membrane; if the coating is too thin, it may not meet the product's use requirements. By fine-tuning the tilt angle of the scraper group, you can ensure that the coating thickness is just right, meeting performance requirements and reducing waste.

[0072] In this embodiment, a pressure sensor is embedded in the second scraper 54;

[0073] The second scraper 54 is vertically slidably provided with two symmetrically arranged and interconnected third scrapers 55 on one side close to the spray roller 4. The inclination direction of the third scraper 55 is the same as the inclination direction of the adjacent first scraper 53. A lifting cylinder 56 is also fixed on the second scraper 54. The lifting cylinder 56 has a lifting end, and the lifting end is connected to the third scraper 55.

[0074] In this embodiment, the pressure sensor can monitor in real time the pressure change on the side of the second scraper 54 close to the spray roller 4. This real-time monitoring function enables the device to respond quickly to any abnormal situation, such as the accumulation of high molecular polymer solution.

[0075] More specifically, the device can determine the distribution of the polymer solution through the detected pressure value. When the pressure is high, it means that a large amount of polymer solution is accumulated in the area. At this time, the lifting cylinder 56 is automatically triggered to adjust the position of the third scraper 55 so that it is lowered. Since the inclination direction of the third scraper 55 is the same as that of the adjacent first scraper 53, they can work together to quickly guide the excess polymer solution toward the two ends of the water bath roller 9.

[0076] In this embodiment, the span of the scraper assembly is smaller than the length of the water bath roller 9 , and a first distance A exists between the end of the first scraper 53 and the end of the water bath roller 9 .

[0077] Specifically, the "span" of the scraper assembly is smaller than the length of the water bath roller 9, which means that the scraper assembly does not completely cover the entire length of the water bath roller 9, but leaves a certain space (i.e., the first distance A). This design allows the excess polymer solution to fall on the water bath roller 9 during the scraping process of the scraper assembly, rather than directly dripping into the water bath tank, for subsequent recovery.

[0078] In addition, two symmetrically arranged suction scraping grooves 57 are fixed below the top frame 51 . The suction scraping grooves 57 are located on the side of the scraper assembly 5 away from the spraying roller 4 . An overlapping area exists between the suction scraping grooves 57 and the first scraper 53 .

[0079] Since the suction scraper groove 57 is configured to be located on the side of the scraper assembly 5 away from the spray roller 4 and its position is close to the end of the first scraper 53, when viewed from the X direction, part of the structure of the suction scraper groove 57 will be projected on the first scraper 53, thereby generating an overlapping area.

[0080] The suction scraper groove 57 is located on the side of the scraper assembly 5 away from the spray roller 4, and has an overlapping area with the first scraper 53. This layout enables the suction scraper groove 57 to capture and recover the high molecular polymer solution at the end of the water bath roller 9 as much as possible. One side of the suction scraper groove 57 is equipped with a negative pressure suction pipe 58 (the suction pipe 58 is connected to an external suction device) to ensure that the solution is effectively sucked in and collected.

[0081] This efficient recycling mechanism not only reduces material waste, but also keeps the production environment clean and tidy, reducing potential problems caused by solution splashing or accumulation.

[0082] In this embodiment, the pre-processing component 7 includes:

[0083] An outer cylinder 71, which is fixedly embedded in the arc frame 6;

[0084] The nozzle 72 is fixedly embedded in the bottom of the outer cylinder 71;

[0085] The spray head 73 is fixedly embedded in the outer cylinder 71 , and there is a gap between the spray head 73 and the nozzle 72 . The spray head 73 is used to spray the water mist.

[0086] In addition, there is an annulus 74 between the nozzle 73 and the outer tube 71, the lower part of the annulus 74 is connected to the gap, the upper part of the annulus 74 is provided with a sealing sleeve 75 connected between the outer tube 71 and the nozzle 73, and one side of the outer tube 71 is also provided with a gas supply hole 76 connected to the annulus 74, and the gas supply hole 76 is used to supply the low-temperature gas.

[0087] When the substrate with the polymer solution enters the water body, the impact of the water body may destroy the uniformity of the coating, resulting in a decrease in the quality of the film. The spraying of low-temperature gas can stabilize the state of the polymer solution and prevent it from becoming uneven due to impact before entering the water body. This helps ensure that the final reverse osmosis membrane has uniform thickness and performance.

[0088] In addition, the annulus 74 provides a space for storing and distributing the cryogenic gas, and the gas supply holes 76 ensure that the gas can be stably and continuously supplied to the nozzle 72, thereby maintaining the continuity and stability of the cryogenic gas spraying.

[0089] In this embodiment, a drying component 12 is further disposed between the fourth guide roller 11 and the receiving roller 13 , and the drying component 12 is located below the substrate.

[0090] In this embodiment, a first guide roller 2 is further provided between the unwinding roller 1 and the second guide roller 3 , and a third guide roller 10 is further provided between the fourth guide roller 11 and the water bath roller 9 .

[0091] In this embodiment, a production process of a reverse osmosis membrane for pure water is also provided, which comprises the following steps:

[0092] S1. The unloading roller 1 continuously supplies the substrate, and the substrate is pressed against the surface of the water bath roller 9 after being guided by the second guide roller 3;

[0093] S2. When the substrate enters below the spray roller 4, the spray roller 4 starts to work, spraying the polymer solution onto the surface of the substrate to form a coating;

[0094] S3. The substrate continues to move and enters below the scraper assembly 5, and the first scraper 53 and the second scraper 54 control the thickness of the coating, wherein the first scraper 53 guides the excess polymer solution to both ends of the water bath roller 9;

[0095] S4. After the scraping treatment, the pretreatment component 7 sprays water mist and low-temperature gas on the surface of the coating. This step is performed after the scraping to stabilize the state of the polymer solution that has been evenly distributed on the substrate to prevent it from being impacted and uneven when it enters the water body later;

[0096] S5. The substrate enters the water bath roller 9 with a stable polymer solution;

[0097] S6. The reverse osmosis membrane is finally guided and leveled by the fourth guide roller 11, and then rolled up by the take-up roller 13. At this point, the entire production process is completed, and the rolled up reverse osmosis membrane can be further processed or used.

[0098] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A production equipment for reverse osmosis membrane for pure water, characterized in that: It comprises a feeding roller (1) for feeding a substrate, wherein the substrate passes through a second guide roller (3), a water bath roller (9), and a fourth guide roller (11) in sequence and is then wound up by a feeding roller (13); The water bath roller (9) is rotatably disposed in a water bath tank (8), and water is pre-placed in the water bath tank (8) for semi-immersing the water bath roller (9); Wherein, a spraying roller (4), a scraper assembly (5), and an arc frame (6) are arranged in sequence above the water bath roller (9) according to the direction of travel of the substrate, and a pretreatment assembly (7) is embedded in the arc frame (6); The spraying roller (4) is used to spray a high molecular polymer solution onto the surface of the substrate to form a coating; The pretreatment component (7) is used to spray water mist and low-temperature gas onto the surface of the coating; The scraper assembly (5) comprises a scraper group, and the scraper group comprises: Two first scrapers (53) arranged symmetrically; Two second scrapers (54) that are symmetrically arranged and connected to each other, wherein the second scrapers (54) are connected to adjacent first scrapers (53) respectively; Wherein, the first scraper (53) and the second scraper (54) are both arranged to be inclined, the inclination direction of the first scraper (53) is: gradually away from the spray roller (4) from one end close to the center reference line (B) to the other end, and the inclination direction of the second scraper (54) is opposite to the inclination direction of the adjacent first scraper (53), and the center reference line (B) is the center length direction of the substrate; A pressure sensor is embedded in the second scraper (54); Two third scrapers (55) are vertically slidably arranged on one side of the second scraper (54) close to the spraying roller (4), and the inclination direction of the third scraper (55) is the same as the inclination direction of the adjacent first scraper (53). A lifting cylinder (56) is also fixed on the second scraper (54), and the lifting cylinder (56) has a lifting end, which is connected to the third scraper (55).

2. The production equipment of a reverse osmosis membrane for pure water according to claim 1, characterized in that: The scraper assembly (5) further comprises a top frame (51), a bottom of which is fixed a deflection assembly (52), wherein the deflection assembly (52) has a deflection end, and the deflection end is connected to the first scraper (53) or the second scraper (54).

3. The production equipment of a reverse osmosis membrane for pure water according to claim 2, characterized in that: The span of the scraper group is smaller than the length of the water bath roller (9), and a first distance (A) exists between the end of the first scraper (53) and the end of the water bath roller (9).

4. The production equipment of a reverse osmosis membrane for pure water according to claim 3, characterized in that: Two symmetrically arranged suction scraping grooves (57) are fixed below the top frame (51); the suction scraping grooves (57) are located on a side of the scraper assembly (5) away from the spray roller (4); and there is an overlapping area between the suction scraping grooves (57) and the first scraper (53).

5. The production equipment of a reverse osmosis membrane for pure water according to claim 1, characterized in that: The pre-processing component (7) comprises: An outer cylinder (71) fixedly embedded in the arc-shaped frame (6); A nozzle (72) fixedly embedded in the bottom of the outer cylinder (71); A spray head (73) is fixedly embedded in the outer cylinder (71), and a gap exists between the spray head (73) and the nozzle (72). The spray head (73) is used to spray the water mist.

6. The production equipment of a reverse osmosis membrane for pure water according to claim 5, characterized in that: An annulus (74) is present between the nozzle (73) and the outer tube (71); the lower portion of the annulus (74) is connected to the gap; the upper portion of the annulus (74) is provided with a sealing sleeve (75) connected between the outer tube (71) and the nozzle (73); and a gas supply hole (76) connected to the annulus (74) is also provided on one side of the outer tube (71); the gas supply hole (76) is used to supply the cryogenic gas.

7. The production equipment of a reverse osmosis membrane for pure water according to claim 1, characterized in that: A drying component (12) is also provided between the fourth guide roller (11) and the receiving roller (13), and the drying component (12) is located below the substrate.

8. A production process for reverse osmosis membrane for pure water, characterized in that: The reverse osmosis membrane is produced by using the production equipment for reverse osmosis membrane for pure water according to any one of claims 1 to 7, which comprises the following steps: S1. The unloading roller (1) continuously supplies the substrate, and the substrate is guided by the second guide roller (3) and then pressed against the surface of the water bath roller (9); S2. When the substrate enters below the spray roller (4), the spray roller (4) starts to work, spraying the polymer solution onto the surface of the substrate to form a coating; S3. The substrate continues to move and enters below the scraper assembly (5), and the first scraper (53) and the second scraper (54) control the thickness of the coating, wherein the first scraper (53) guides the excess polymer solution to the two ends of the water bath roller (9); S4. After the scraping treatment, the pretreatment component (7) sprays water mist and low-temperature gas onto the surface of the coating; S5. The substrate carries the stable polymer solution into the water bath roller (9) to form a reverse osmosis membrane; S6. The reverse osmosis membrane is finally guided and leveled by the fourth guide roller (11) and then rolled up by the take-up roller (13).

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