Gluing method in industrial reverse osmosis membrane element rolling process

Abstract

The invention discloses a gluing method in a rolling process of an industrial reverse osmosis membrane element, which comprises the following steps: S1, providing a membrane rolling platform which has a first direction and a second direction which are perpendicular to each other, and arranging a central pipe on the membrane rolling platform along the second direction, a first gluing mechanism, a second gluing mechanism and a third gluing mechanism are arranged on the film rolling platform in parallel, wherein the first gluing mechanism and the second gluing mechanism can move in the first direction, and the third gluing mechanism can move in the second direction; s2, the folded reverse osmosis membrane is laid on a membrane rolling platform, the rolling starting end is bonded with the central cylinder, and the rolling tail end is far away from the central tube; s3, a first gluing mechanism is made to conduct gluing on the membrane with the rolling starting end as the starting point and the rolling tail end as the end point; enabling the second gluing mechanism to glue on the diaphragm by taking the rolling tail end as a starting point and the rolling starting end as an end point; the third gluing mechanism conducts gluing on the membrane with the end point of the first gluing mechanism as the starting point and the starting point of the second gluing mechanism as the end point; and S4, repeating the steps S2 to S3, and rolling the central pipe to obtain the industrial reverse osmosis membrane element.

Description

Technical Field

[0001] The invention relates to the technical field of reverse osmosis membrane elements, and in particular to a glue coating method in a rolling process of an industrial reverse osmosis membrane element. Background Art

[0002] In the existing industrial reverse osmosis membrane element production process, the commonly used rolling method is: after placing a page of folded reverse osmosis membrane, start the glue button of the glue water coating equipment to apply glue on the three sides of the reverse osmosis membrane in a "U" shape. However, this gluing method will have the following problems: (1) With the development of existing automated gluing equipment, during the reverse osmosis membrane element rolling process, the gluing and film rolling stations have become bottlenecks in the production process, especially the gluing station. A single glue gun (glue coating mechanism) needs to meet the requirements of gluing on the three sides of the entire reverse osmosis membrane, namely the upper, lower and end sides. This will result in a long gluing time and affect production efficiency; (2) After the current single gluing mechanism completes the gluing on the three sides of the reverse osmosis membrane, the three glue lines will not be able to pass through. The confluence of the trajectories will form a "U"-shaped glue coating structure. In industrial-grade reverse osmosis membrane elements, after the "U"-shaped glue line is spread out, it will occupy a large amount of the reverse osmosis membrane area at the upper, lower and end turns, which will affect the actual effective area of ​​the reverse osmosis membrane (reverse osmosis membrane element) and the flux of the membrane element; (3) At present, a single glue coating mechanism adopts the X, Y, and Z three-axis operation mode to achieve three-sided glue coating on the upper, lower and end sides of the reverse osmosis membrane, but the three-axis operation will make the control system of the glue coating mechanism complicated to operate. At the same time, when switching product models, it is also necessary to perform X, Y, and Z three-axis synchronous model change, which makes personnel operation complicated and prone to improper operation, thereby causing product quality defects. Summary of the invention

[0003] The purpose of the present invention is to provide a method for coating glue in the rolling process of industrial reverse osmosis membrane elements, in view of the problems that the existing three-side coating method of reverse osmosis membrane has a long coating time, low production efficiency, and is prone to forming a "U"-shaped coating structure that affects the flux of the reverse osmosis membrane element, as well as complicated operation and easy to cause product quality defects, thereby solving the above problems.

[0004] To achieve the above object, the present invention is implemented by the following technical solutions:

[0005] The present invention provides a method for coating glue in a rolling process of an industrial reverse osmosis membrane element, the method comprising the following steps:

[0006] S1. Provide a film rolling platform having a first direction and a second direction perpendicular to each other, wherein a central tube is arranged on the film rolling platform along the second direction, and the central tube has the freedom to roll along the first direction on the film rolling platform;

[0007] The film rolling platform is also provided with a first gluing mechanism and a second gluing mechanism that can move along the first direction in parallel, and a third gluing mechanism that can move along the second direction;

[0008] S2, laying the folded reverse osmosis membrane on the membrane rolling platform, with the rolling start end of the reverse osmosis membrane bonded to the central tube and the rolling end of the reverse osmosis membrane away from the central tube;

[0009] S3, starting the first gluing mechanism, the second gluing mechanism and the third gluing mechanism at the same time, and applying glue in the following manner:

[0010] The first glue coating mechanism is enabled to coat glue on the reverse osmosis membrane in a directional track along a first direction, with the rolling start end as the starting point and the rolling end end as the end point;

[0011] The second glue coating mechanism is used to coat glue on the reverse osmosis membrane in a directional track along a first direction, with the rolling end as a starting point and the rolling start end as an end point;

[0012] The third glue coating mechanism is made to coat the glue on the reverse osmosis membrane in a directional track along a second direction, with the end point of the first glue coating mechanism as the starting point and the starting point of the second glue coating mechanism as the end point, so as to complete a closed loop of the glue coating track;

[0013] S4. Repeat the operations of steps S2 to S3 according to the different numbers of reverse osmosis membrane layers in different industrial reverse osmosis membrane elements. After the glue coating is completed, the element is rolled through the central tube to obtain an industrial reverse osmosis membrane element.

[0014] Furthermore, a method for gluing during the rolling process of an industrial reverse osmosis membrane element is provided: the first gluing mechanism and the second gluing mechanism are arranged on the membrane rolling platform and have a position adjustment freedom in a second direction.

[0015] Furthermore, a method for gluing during the rolling process of an industrial reverse osmosis membrane element is provided: the reverse osmosis membrane has a first side and a second side opposite to each other; the spacing between the first gluing mechanism and the second gluing mechanism is smaller than the spacing between the first side and the second side.

[0016] Furthermore, a method for gluing during the rolling process of an industrial reverse osmosis membrane element is provided: the third gluing mechanism is arranged on the membrane rolling platform and has a position adjustment freedom in a first direction.

[0017] That is, the distance between the first gluing mechanism and the second gluing mechanism can be adjusted to meet the gluing requirements of reverse osmosis membranes of different widths (ie, the distances between the first side and the second side are different).

[0018] Furthermore, a method for applying glue during the rolling process of an industrial reverse osmosis membrane element is provided: the rolling start end is bonded to the central tube and a tension of 20 to 80 N is formed between the reverse osmosis membrane sheet and the central tube.

[0019] Furthermore, a method for coating glue during the rolling process of an industrial reverse osmosis membrane element is provided: a plurality of water inlet holes are radially arranged on the wall of the central tube.

[0020] Furthermore, a method for applying glue during the rolling process of an industrial reverse osmosis membrane element is provided: a water outlet hole is axially arranged inside the central tube.

[0021] Beneficial effects of the present invention:

[0022] (1) The gluing method of the present invention uses three gluing mechanisms to simultaneously apply single-page glue on three sides of the reverse osmosis membrane, thereby improving the gluing efficiency and reducing the time occupied by single-page gluing, thereby improving the production efficiency of the reverse osmosis membrane element. At the same time, each of the three gluing mechanisms only needs to perform two-dimensional movement, which also makes the operation procedure of the gluing mechanism control system simple and reduces the difficulty of personnel operation. Moreover, the three gluing mechanisms all perform linear motion trajectories, and after the upper and lower side glue lines and the end side glue lines intersect, a cross-intersecting right-angle docking can be formed, rather than a "U"-shaped glue line. Therefore, after the glue lines are spread out, there is no situation where glue occupies the reverse osmosis membrane area at the upper and lower sides and the end side turning points of the reverse osmosis membrane, thereby increasing the actual effective area of ​​the reverse osmosis membrane and increasing the flux of the membrane element.

[0023] (2) The present invention aims at the shortcomings of the existing single three-axis gluing mechanism in the reverse osmosis membrane gluing method, such as low efficiency, complicated operation, and the appearance of a "U"-shaped gluing track at the intersection of the upper and lower sides and the end sides, which occupies the area of ​​the reverse osmosis membrane. A new gluing method is proposed in this method. The method adopts three two-axis gluing mechanisms to perform three-side gluing on the reverse osmosis membrane of the same page, thereby improving the gluing efficiency by about 2 / 3. In addition, the control system operation difficulty of the two-axis gluing mechanism is much lower than that of the three-axis gluing mechanism, thereby reducing product quality defects caused by human error. At the same time, the present invention can ensure that a cross gluing method is adopted at the intersection of the upper and lower sides and the end sides through the staggered gluing of the three two-axis gluing mechanisms, thereby reducing the effective area of ​​the reverse osmosis membrane occupied by glue and improving the flux performance of the product. According to actual theoretical calculations, the gluing method of the present invention can reduce the effective area of ​​the membrane occupied by about 1.0%, and the product flux can be increased by 1.0%. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 This is a schematic diagram of the operation of a method for coating glue during the rolling process of an industrial reverse osmosis membrane element provided in Example 1 of the present invention;

[0026] Figure 2 In order to use the traditional glue coating method Figure 1 Schematic diagram showing glue accumulation at part A in the figure.

[0027] Markings in the figure:

[0028] 1-membrane rolling platform, 2-central tube, 3-first gluing mechanism, 4-second gluing mechanism, 5-third gluing mechanism, 6-reverse osmosis membrane, 7-glue occupied area, 21-water inlet hole, 22-water outlet hole, 61-rolling start end, 62-rolling end end, 63-first side edge, 64-second side edge. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating the position or positional relationship, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment 1 provides a method for coating glue during the rolling process of an industrial reverse osmosis membrane element, the method comprising the following steps:

[0033] S1. Provide a film rolling platform 1, which has a first direction and a second direction perpendicular to each other, a central tube 2 is arranged on the film rolling platform 1 along the second direction, and the central tube 2 has the freedom to roll along the first direction on the film rolling platform 1, a plurality of water inlet holes 21 are radially arranged on the tube wall of the central tube 2, and a water outlet hole 22 is axially arranged inside the central tube 2; a first glue coating mechanism 3 and a second glue coating mechanism 4 movable along the first direction are also arranged in parallel on the film rolling platform 1, and the first glue coating mechanism 3 and the second glue coating mechanism 4 have the freedom to adjust the position along the second direction on the film rolling platform 1, and a third glue coating mechanism 5 movable along the second direction is also arranged on the film rolling platform 1, and the third glue coating mechanism 5 has the freedom to adjust the position along the first direction on the film rolling platform 1;

[0034] S2, providing a reverse osmosis membrane 6 having a first side edge 63 and a second side edge 64 opposite to each other, wherein the spacing between the first gluing mechanism 3 and the second gluing mechanism 4 is smaller than the spacing between the first side edge 63 and the second side edge 64, laying the folded reverse osmosis membrane 6 on the membrane rolling platform 1, and making the first side edge 63 and the second side edge 64 extend along the first direction, so that the rolling start end 61 of the reverse osmosis membrane 6 is bonded to the central tube 2, and a tension of 20 to 80 N is formed between the reverse osmosis membrane 6 and the central tube 2, and making the rolling end 62 away from the central tube 2;

[0035] S3, simultaneously start the first gluing mechanism 3, the second gluing mechanism 4 and the third gluing mechanism 5, and apply glue in the following manner:

[0036] The first glue coating mechanism 3 is configured to coat the reverse osmosis membrane 6 with the first rolling end 61 as the starting point and the last rolling end 62 as the end point, along a first direction and in a directional track;

[0037] The second glue coating mechanism 4 is configured to coat the reverse osmosis membrane 6 with the rolling end 62 as the starting point and the rolling start 61 as the end point, along the first direction, in a directional track;

[0038] The third glue coating mechanism 5 is made to coat glue on the reverse osmosis membrane 6 along a second direction, starting from the end point of the first glue coating mechanism 3 and ending at the starting point of the second glue coating mechanism 4, so as to complete a closed loop of the glue coating track;

[0039] S4. Repeat steps S2 to S3 according to the number of reverse osmosis membrane sheets 6 in different industrial reverse osmosis membrane elements. After the glue coating is completed, the element is rolled through the central tube 2 to obtain an industrial reverse osmosis membrane element.

[0040] The above-mentioned embodiment 1 provides a new method for gluing reverse osmosis membrane element rolling. This method adopts three gluing mechanisms to simultaneously perform gluing on a two-dimensional surface, thereby reducing the gluing time, improving the rolling efficiency of the membrane element, and reducing the difficulty of operating the gluing software program. In addition, the three gluing tracks formed after gluing in this method can form a right-angle intersection without forming a "U"-shaped gluing intersection track. Therefore, it can be avoided that the glue line of the "U"-shaped structure occupies the area of ​​the reverse osmosis membrane at the upper and lower sides and end side turning points of the reverse osmosis membrane after being spread out, thereby increasing the use area of ​​a single-page reverse osmosis membrane and improving the flux of the membrane element product.

[0041] The method of this embodiment 1 upgrades a three-axis gluing mechanism to three gluing mechanisms working simultaneously. Under the same diaphragm length and width, the gluing efficiency of the method of the present invention can be improved by about 2 / 3, and the operating difficulty is changed from a single three-dimensional operation to three two-dimensional plane operations. The operation is simple and avoids the impact of human error on product quality.

[0042] The gluing method of this embodiment 1 can optimize the "U"-shaped glue line trajectory formed by the intersection of three glue lines after the traditional gluing method is applied to a glue line trajectory intersecting at right angles, such as Figure 2The "U"-shaped glue line track formed by the traditional glue coating method shown in the figure will have glue accumulation at the first side 63, the second side 64 and the turning point of the rolling end 62 of the reverse osmosis membrane, forming a glue occupied area 7, which will occupy a part of the area of ​​the reverse osmosis membrane, which will lead to a reduction in the actual use area of ​​the reverse osmosis membrane, and will cause a decrease in water flux; while the glue coating method of the present invention is changed into three glue coating mechanisms to synchronously perform glue coating on the directional track according to the steps, and the glue lines at the joints of the three glue coating tracks (i.e., glue lines) are uniform, and there will be no glue line accumulation, etc., thereby effectively avoiding the problem of glue accumulation occupying the membrane area, increasing the use area of ​​the reverse osmosis membrane, and further improving the flux performance of the reverse osmosis membrane element product. According to actual theoretical calculations, the glue coating method of the present invention can reduce the effective area of ​​the reverse osmosis membrane occupied by glue by about 1.0%, so that the product flux can be increased by about 1.0%.

[0043] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A method for coating glue in the process of rolling an industrial reverse osmosis membrane element, characterized in that: The method comprises the following steps: S1. Providing a film rolling platform (1), which has a first direction and a second direction perpendicular to each other, wherein a central tube (2) is arranged on the film rolling platform (1) along the second direction, and the central tube (2) has the freedom to roll along the first direction on the film rolling platform (1); The film rolling platform (1) is also provided with a first gluing mechanism (3) and a second gluing mechanism (4) which can move along a first direction, and a third gluing mechanism (5) which can move along a second direction in parallel; S2, laying the folded reverse osmosis membrane sheet (6) on the membrane rolling platform (1), with the rolling start end (61) of the reverse osmosis membrane sheet (6) bonded to the central tube (2), and the rolling end end (62) away from the central tube (2); S3, simultaneously starting the first gluing mechanism (3), the second gluing mechanism (4) and the third gluing mechanism (5), and applying glue in the following manner: The first glue coating mechanism (3) is used to coat glue on the reverse osmosis membrane (6) in a directional track along a first direction, with the rolling start end (61) as a starting point and the rolling end end (62) as an end point; The second glue coating mechanism (4) is used to coat glue on the reverse osmosis membrane (6) in a directional track along a first direction, with the rolling end (62) as a starting point and the rolling start end (61) as an end point; The third glue coating mechanism (5) is caused to coat glue in a directional track on the reverse osmosis membrane (6) along a second direction, with the end point of the first glue coating mechanism (3) as the starting point and the start point of the second glue coating mechanism (4) as the end point, so as to complete a closed loop of the glue coating track; S4. Repeat steps S2 to S3 according to the number of layers of reverse osmosis membrane sheets (6) in different industrial reverse osmosis membrane elements. After the glue coating is completed, the element is rolled through the central tube (2) to obtain an industrial reverse osmosis membrane element.

2. The method for coating glue in the process of rolling an industrial reverse osmosis membrane element according to claim 1, characterized in that: The first gluing mechanism (3) and the second gluing mechanism (4) are arranged on the film rolling platform (1) and have a position adjustment freedom in a second direction.

3. The method for coating glue in the process of rolling an industrial reverse osmosis membrane element according to claim 1 or 2, characterized in that: The reverse osmosis membrane (6) has a first side edge (63) and a second side edge (64) opposite to each other; The distance between the first gluing mechanism (3) and the second gluing mechanism (4) is smaller than the distance between the first side edge (63) and the second side edge (64).

4. The method for coating glue in the process of rolling an industrial reverse osmosis membrane element according to claim 1, characterized in that: The third glue coating mechanism (5) is arranged on the film rolling platform (1) and has a position adjustment freedom in a first direction.

5. The method for coating glue in the process of rolling an industrial reverse osmosis membrane element according to claim 1, characterized in that: The rolling start end (61) is bonded to the central tube (2) and a tension of 20 to 80 N is formed between the reverse osmosis membrane (6) and the central tube (2).

6. The method for coating glue in the process of rolling an industrial reverse osmosis membrane element according to claim 1, characterized in that: A plurality of water inlet holes (21) are also radially arranged on the tube wall of the central tube (2).

7. The method for coating glue in the process of rolling an industrial reverse osmosis membrane element according to claim 1, characterized in that: A water outlet hole (22) is axially arranged inside the central tube (2).

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