CN103521077A - Roll-type high-precision membrane module - Google Patents
Roll-type high-precision membrane module Download PDFInfo
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- CN103521077A CN103521077A CN201310506669.3A CN201310506669A CN103521077A CN 103521077 A CN103521077 A CN 103521077A CN 201310506669 A CN201310506669 A CN 201310506669A CN 103521077 A CN103521077 A CN 103521077A
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Abstract
The invention discloses a roll-type high-precision membrane module comprising a central tube, a water purification diaphragm group and a guide bar, wherein the water purification diaphragm group is wound on the central tube, and comprises a raw water guide net, a flake high-precision filter membrane and a product water guide net; one side surface of the flake high-precision filter membrane is adjacent to a raw water runner or adjacent to the raw water guide net; the other side surface of the flake high-precision filter membrane is adjacent to a water-yielding runner or adjacent to a product water guide net; a space for arranging the raw water guide net is the raw water runner; a space for arranging the product water guide net is the water-yielding runner; at least one guide bar is arranged inside the raw water runner; the length of the guide bar is not smaller than that of the raw water guide net in a winding direction after being unfolded; the internal part of the central tube is communicated with the raw water runner; the entire outer side surface is wound by a silk yarn after the water purification diaphragm group is wound on the central tube. The roll-type high-precision membrane module disclosed by the invention is not easily blocked, long in service life and high in recovery rate.
Description
Technical field
The present invention relates to rolling high accuracy membrane module for water treatment.
Background technology
The coiled reverse osmosis membrane assembly of known technology is conventionally wrapped on the water producing pipe of center and is formed by one group or two groups of water purification diaphragm groups, and described water purification diaphragm group is produced the stack of water flow-guiding screen by a former water flow-guiding screen, two sheet reverse osmosis membranes and one and formed; The inner side of two sheet reverse osmosis membranes is that former water flow passage also arranges former water flow-guiding screen therein, and water flow-guiding screen is produced for producing water flow passage and arranging in producing water flow passage in the outside of two sheet reverse osmosis membranes; Produce water flow passage and be provided with opening at the side towards center water producing pipe, this open communication center water producing pipe is inner, and its excess-three side that produces water flow passage is bonded and sealed with glue; Two side closing seams that former water flow passage Yu center water producing pipe axis is parallel, all the other two side openings; Water purification diaphragm group is after the water producing pipe of the center of winding, and whole outer surface is wound around sealing with adhesive tape.
Known from said structure, the length of former water flow passage is exactly the axial length that central tube is wound part, and the width of former water flow passage is exactly the length on winding direction after the former water flow passage that is wound around shape is launched; The length of producing water flow passage is exactly the length on winding direction after the product water flow passage that is wound around shape is launched, and the width that produces water flow passage is exactly the axial length that central tube is wound part.Conventionally, length after described former water flow passage expansion on winding direction is significantly greater than the axial length that central tube is wound part, the width that is former water flow passage is significantly greater than its length, the domestic type coiled reverse osmosis membrane assembly of 50GDP of take is example, length after former water flow passage expansion on winding direction is roughly 860 millimeters, and the axial length that central tube is wound part is roughly 260 millimeters.
Above-mentioned membrane module structure is as being used in household reverse osmosis water purifier, and there are the following problems:
1. the width of former water flow passage is too wide, causes reverse osmosis membrane more easily to stop up.
In thickness one timing of former water flow passage, its width is wider just means that cross-sectional area is larger; Less once the flow velocity of the larger water of timing cross-sectional area at raw water flow; The flow velocity of water is less, in water, easily stops up the material of reverse osmosis membrane more easily at film surface deposition, and reverse osmosis membrane more easily stops up.
2. the length of former water flow passage is too short, causes capacity usage ratio too low.
First, a reverse osmosis membrane assembly is generally only installed in household reverse osmosis water purifier, is difficult to extend by the method for serial connection membrane module the length of former water flow passage, because former water flow passage is too short, therefore the hydraulic pressure in former water flow passage does not almost decline at Parallel to the flow direction; Secondly, make reverse osmosis membrane be difficult for stopping up, must maintain former water and flow with larger flow velocity, when the cross-sectional area of former water flow passage is also very large, necessarily require that raw water flow is also very large could obtain larger flow velocity; The 3rd, according to the suggestion of reverse osmosis membrane manufacturing enterprise, on unit flow channel length, the rate of recovery of water should not be too high, otherwise easily stop up reverse osmosis membrane, conventionally suggestion rate of recovery of water in the length range of single membrane module is advisable in 15% left and right, for household machine, also should not be greater than 25%, the rate of recovery is too high take and sacrifice the reverse osmosis membrane life-span as cost, be that former water is in flowing through this process of length of a membrane module of former water flow passage, the ratio that sees through the shared former water of product water of reverse osmosis membrane is advisable with 15% left and right, for household machine, also should not be greater than 25%; The 4th, overcome the osmotic pressure of reverse osmosis membrane, the hydraulic pressure in former water flow passage is height enough.Comprehensive above-mentioned 4 points, can draw the following conclusions: flow into former water flow passage former water before, have larger hydraulic pressure, also will have larger flow; Flowing out former water flow passage (dense) water (under known technology condition) afterwards still maintains and original high hydraulic pressure about the same, and flow reduces also seldom, can not be greater than 25%, in other words, in former water, approximately 75% energy is not utilized effectively, this part includes the condensed water of higher-energy normally in the discharge of emptying after throttling arrangement (being commonly called as waste water ratio) step-down, and energy wherein has also just wasted.
3. wastewater discharge is too large.
Make reverse osmosis membrane have sufficiently long service life, just must make counter-infiltration pleurodiaphragmatic in terspace water side have enough large water velocity, at former water flow passage width one regularly, namely must guarantee enough large wastewater discharge, because of the former water flow passage of conventional film modular construction too wide, so the condensed water of its discharge is just a lot, waste water resource.
4. the flow velocity of former water in membrane module flows less and less, and counter-infiltration is easily stopped up.
In the flow process of former water in former water flow passage, its flow velocity can be more and more less along water (flow) direction, because the cross-sectional area of former water flow passage is even constant in water (flow) direction (being the length direction of former water flow passage), and the flow of former water becomes product water inflow product water flow passage and constantly reduces event owing to there being part current constantly to see through reverse osmosis membrane.Former water flow velocity is more and more less, will cause the material that easily stops up reverse osmosis membrane in water to be more and more easily deposited on reverse osmosis membrane surface, finally makes reverse osmosis membrane stop up and scraps.
5. the length of producing water flow passage is oversize, and width is too narrow
When product discharge is larger, this product water flow passage just has obvious resistance to water-flow, and resistance to water-flow is larger, and back pressure is just larger, and former water is the more difficult reverse osmosis membrane that sees through just, affects the aquifer yield of reverse osmosis membrane assembly.In other words, the length structure oversize and that width is too narrow of product water flow passage is a kind of structure of wasting energy.
The problem existing for above-mentioned known technology, application number is the technical scheme that 200910201739.8 patent documentation discloses improved, known according to the description of the document, in this technical scheme, the plan of establishment of pure water runner is the same as with known technology change; Former water flow passage changes into: the length of former water flow passage is the length on winding direction after the former water flow passage that is wound around shape is launched, and centered by the width of former water flow passage, pipe is wound the axial length of part.Be not difficult to find out, this technology makes the length of former water flow passage bring up to original 4 times, width is original 1/4, so the flow velocity of former water in former water flow passage can enlarge markedly, can significantly improve the service life of reverse osmosis membrane, simultaneously, producing water ratio also can significantly improve, and discharge of wastewater ratio also can therefore and significantly decline, and the capacity usage ratio in former water also improves.
But, also there is following deficiency:
1. the width of former water flow passage remains evenly constant in the longitudinal direction, and the speed of current remains on Parallel to the flow direction that more stream is less, i.e. it is more and more serious that the obstruction of reverse osmosis membrane tendency remains Parallel to the flow direction.
2. pure water runner does not improve, and unborn problem still exists.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of difficult obstruction, the rolling high-precision filtration film membrane module of long service life.
In order to solve the problems of the technologies described above, technical scheme provided by the present invention is: a kind of rolling high accuracy membrane module, comprises central tube, water purification diaphragm group and flow guide bar; Described water purification diaphragm group is wrapped on central tube; Described water purification diaphragm group comprises former water flow-guiding screen, sheet high-precision filtration film and product water flow-guiding screen; A side of described sheet high-precision filtration film is adjoined former water flow passage or is adjoined former water flow-guiding screen, and its another side is adjoined product water flow passage or adjoined product water flow-guiding screen; The space of described former water flow-guiding screen setting is former water flow passage, and the space that described product water flow-guiding screen arranges is for producing water flow passage; Described flow guide bar is arranged in former water flow passage, and is provided with at least one, for water proof and water conservancy diversion; The length of described flow guide bar is not shorter than former water flow-guiding screen launch after length on winding direction; The former water flow passage of internal communication of described central tube; Water purification diaphragm group is after being wound around central tube, and whole outer surface is wound around with silk thread, and the two ends of outer surface are respectively equipped with a sealing ring.
Further technical measures are: described product water flow passage is rectangular after launching, produce two side closing seams water flow passage and parallel with central tube axis, a side in all the other two sides of product water flow passage is provided with product water outlet, namely: product water outlet is arranged on a side in rear two sides vertical with central tube axis of its expansion that produce water flow passage.At this moment, the length of product water flow passage is exactly the axial length that central tube is wound part, and the width that produces water flow passage is exactly the length of producing the rear side vertical with central tube axis of its expansion of water flow passage.
Further technical measures are: described water purification diaphragm group comprises a former water flow-guiding screen, two sheet high-precision filtration films and a product water flow-guiding screen; Two sheet high-precision filtration films in described water purification diaphragm group are to be formed by folding by a large high-precision filtration film, and this folded edge is exactly a side of the closing seam of former water flow passage, or produce a side of the closing seam of water flow passage.By folding mode, form the side of nature sealing, and with glue, two high-precision filtration films are carried out to the side that bonding mode forms sealing and compare, the former has reduced glue use amount, has expanded the effective filtration area of film simultaneously.Preferred scheme: described folded edge is winding shape in rolling high accuracy membrane module, this folded edge that is wound around shape is vertical with central tube axis after launching.The benefit arranging is like this: folded edge is long, the more remarkable effect aspect the effective filtration area of minimizing glue use amount and expansion film.
The some of described central tube is former water water inlet pipe, and another is partly condensed water outlet pipe; Central tube is provided with inner chamber is separated into two-part seal, and wherein a part of inner chamber is former water water inlet pipe, and another part inner chamber is condensed water outlet pipe; Former water water inlet pipe is communicated with the import of former water flow passage, and condensed water outlet pipe is communicated with the outlet of former water flow passage; The import of described former water flow passage and outlet be all arranged on former water flow passage near or the side of top central tube on, former water flow passage parallel with central tube axis and away from the side openings of central tube, two side closing seams of all the other of former water flow passage; In former water flow passage, be provided with a flow guide bar, between one end of described flow guide bar and described seal, it is sealed attachment, it can be direct sealed attachment, can be also indirect sealed attachment, the through former water flow passage of the other end of flow guide bar away from central tube and the side parallel with central tube.
Described flow guide bar can form with binding agent, the position filling adhesive of flow guide bar is being set; Described flow guide bar also can form with flexible sealing material, in the position that flow guide bar is set, has filled the flexible sealing material of water proof and guide functions.
Further technical measures are: the high-precision filtration film described in above-mentioned each scheme is reverse osmosis membrane, or NF membrane, or milipore filter.
Further technical measures are: in rolling high accuracy membrane module in the shape of a spiral, its mode reducing gradually according to the width that can make former water flow passage in former water flow passage in water (flow) direction arranges flow guide bar described in above-mentioned each scheme obliquely.
Adopted after technique scheme, the present invention has following beneficial effect:
(1) the former water flow passage in rolling high accuracy membrane module of the present invention, its length is significantly elongated, and width significantly narrows down, therefore former water flow speed is large, the material that easily stops up sheet high-precision filtration film in water is difficult at film surface deposition, the long service life of film.
It is 2 times of 200910201739.8 the disclosed technical scheme of patent documentation that former water flow passage length of the present invention is about application number, therefore flow velocity is also significantly greater than this technical scheme certainly; For flow guide bar spiral technical scheme in rolling high accuracy membrane module, former water is in flow process, water velocity can not reduce, and water velocity does not reduce along the obstruction of water (flow) direction high-precision filtration film, to be inclined to and can not increase exactly, is conducive to extend the service life of high-precision filtration film; And the flowing velocity of former water reduces gradually during the operation of the disclosed technical scheme of the patent documentation that application number is 200910201739.8, water velocity reduces just to mean that the obstruction tendency of reverse osmosis membrane increases gradually gradually.
(2) the disclosed technical scheme of patent documentation that is 200910201739.8 with application number is compared, rolling high accuracy membrane module of the present invention is mainly to realize new function by the mode at flow guide bar and change intake-outlet position is suitably set, therefore the cost increasing is very little.
(3) for pipe centered by the length of product water flow passage, be wound the technical scheme of the axial length of part, very short because producing the length of water flow passage, resistance when product water flows is very little, even if product water flow does not almost have extra fluid resistance loss greatly yet, capacity usage ratio is higher.
Accompanying drawing explanation
For content of the present invention is more easily expressly understood, according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation, wherein below
Fig. 1 is the cross section structure schematic diagram after the water purification diaphragm group of embodiments of the invention 1 is partly launched.
Fig. 2 is the structural representation after the water purification diaphragm group of embodiments of the invention 1 is launched.
Fig. 3 is the outline drawing of embodiments of the invention 1.
Fig. 4 is the cross section structure schematic diagram after the water purification diaphragm group of embodiments of the invention 2 is partly launched.
Fig. 5 is the structural representation after the water purification diaphragm group of embodiments of the invention 2 is launched.
Label in accompanying drawing is:
Concrete enforcement is vertical
Embodiment mono-
See Fig. 1 to Fig. 3, the rolling high accuracy membrane module of the present embodiment, comprises central tube 4, water purification diaphragm group 9 and flow guide bar 10; Described water purification diaphragm group 9 is wrapped on central tube 4; Described water purification diaphragm group 9 comprises a former water flow-guiding screen 11, two sheet high-precision filtration films 13 and product water flow-guiding screens 15, and product water flow-guiding screen 15 is arranged between two sheet high-precision filtration films 13, and water flow passage 16 is produced in this space exactly; Former water flow passage 14 is adjoined in a side of described sheet high-precision filtration film 13, and product water flow passage 16 is adjoined in its another side; Described former water flow-guiding screen 11 is arranged in former water flow passage 14, and described product water flow-guiding screen 15 is arranged on and produces in water flow passage 16; Described flow guide bar 10 is arranged in former water flow passage 14, former water flow passage 14 after launching flow guide bar 10 be wherein vertical bar shape and vertical with the axis of central tube 4, be provided with one, the length of flow guide bar 10 is not shorter than former water flow-guiding screen 11 launch after length on winding direction, between one end of flow guide bar 10 and seal 3, be sealed attachment, the through former water flow passage 14 of the other end of flow guide bar 10 away from central tube 4 and the side parallel with central tube 4 axis; The product water outlet 6 of described product water flow passage 16 is arranged on a side in rear two sides vertical with central tube 4 axis of its expansion that produce water flow passage 16, produces remaining bonding sealing of glue 17 for three sides of water flow passage 16; One end of described central tube 4 is original water inlet 1, the other end is condensed water outlet 5, in it, be provided with inner chamber is separated into two-part seal 3, wherein a part of inner chamber is communicated with the import of former water flow passage 14 by part central tube opening 2, and another part inner chamber is communicated with the outlet of former water flow passage 14 by another part central tube opening 2; The import of described former water flow passage 14 and outlet be all arranged near or the side of top central tube 4 on, former water flow passage 14 parallel with central tube 4 axis and away from the side openings of central tube 4, all the other two side closing seams of former water flow passage 14; Described water purification diaphragm group 9 is after being wound around central tube 4, and whole outer surface is wound around with silk thread 7, is convenient to current and flows into swimmingly and flow out from the parallel with central tube 4 axis of former water flow passage 14 and away from the opening part of the side of central tube 4; Described high-precision filtration film 13 is reverse osmosis membranes; The two ends in the outside of the rolling high accuracy membrane module winding are respectively equipped with a sealing ring 8, its profile is substantially the same with common rolled membrane module, therefore can be compatible with the reverse-osmosis treated device housing that uses in conventional art, thereby contribute to of the present invention applying.
During the present embodiment operation, former water flows into a part of inner chamber of central tube from the raw water inlet 1 of central tube 4, through the former water flow passage 14 of the rear inflow of a part of central tube opening 2, then along one section of former water flow passage 14 to be wound around that the mode of central tube 4 and the central tube of wandering about as a refugee gradually flows to the parallel with central tube axis of former water flow passage 14 and away from the part section of the side of central tube, then flow out rolling high accuracy membrane module, and then flow into rolling high accuracy membrane module from the parallel with central tube axis of former water flow passage 14 and away from another section of the side of central tube, along another section of former water flow passage 14, in the mode that is wound around central tube 4 and flows to gradually central tube, flow again, at another part inner chamber through another part central tube opening 2 rear inflow central tubes, finally from condensed water outlet 5, flow out, former water is in flow process, and the part that sees through sheet reverse osmosis membrane 13 becomes pure water (being finished product water) and flows into product water flow passage 16, then flows out from product water outlet 6.
It is 2 times of 200910201739.8 the disclosed technical scheme of patent documentation that former water flow passage 14 length of the present embodiment are about application number, therefore flow velocity is also significantly greater than this technical scheme certainly, therefore also can correspondingly significantly increase the service life of reverse osmosis membrane.
Embodiment bis-
See Fig. 4 and Fig. 5, the rolling high accuracy membrane module fundamental sum embodiment mono-of the present embodiment is identical, difference is: former water flow-guiding screen 11 is arranged between two sheet high-precision filtration films 13, after former water flow passage 14 is launched, flow guide bar 10 wherein and the axis out of plumb of central tube 4, in rolling high accuracy membrane module in the shape of a spiral, its mode reducing gradually according to the width that can make former water flow passage 14 in former water flow passage 14 in water (flow) direction arranges flow guide bar 10 obliquely; Two sheet high-precision filtration films 13 are to be formed by folding by a large high-precision filtration film 13, this folded edge is winding shape in rolling high accuracy membrane module, this folded edge is exactly a side of the closing seam of former water flow passage 11, and this side launches rear vertical with the axis of central tube 4; The present embodiment other side is identical with embodiment mono-.
The former water of the present embodiment is in flow process, and water velocity can not reduce, and water velocity does not reduce along the obstruction of water (flow) direction reverse osmosis membrane, to be inclined to and can not increase exactly, is conducive to extend the service life of reverse osmosis membrane; And the flowing velocity of former water reduces gradually during the operation of the disclosed technical scheme of the patent documentation that application number is 200910201739.8, water velocity reduces just to mean that the obstruction tendency of reverse osmosis membrane increases gradually gradually.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. a rolling high accuracy membrane module, is characterized in that: comprise central tube (4), water purification diaphragm group (9) and flow guide bar (10); Described water purification diaphragm group (9) is wrapped on central tube (4); Described water purification diaphragm group (9) comprises former water flow-guiding screen (11), sheet high-precision filtration film (13) and product water flow-guiding screen (15); A side of sheet high-precision filtration film (13) is adjoined former water flow passage (14) or is adjoined former water flow-guiding screen (11), and its another side is adjoined product water flow passage (16) or adjoined product water flow-guiding screen (15); The space that former water flow-guiding screen (11) arranges is former water flow passage (14), and the space that product water flow-guiding screen (15) arranges is for producing water flow passage (16); Described flow guide bar (10) is arranged in former water flow passage (14), and is provided with at least one, the length of this flow guide bar (10) is not shorter than former water flow-guiding screen (11) launch after length on winding direction; The former water flow passage of internal communication (14) of described central tube (4); Water purification diaphragm group (9) after being wound around central tube (4), whole silk thread (7) winding outer surface for.
2. rolling high accuracy membrane module according to claim 1, it is characterized in that: described product water flow passage (16) is rectangular after launching, produce two the side closing seams parallel with central tube (4) axis of water flow passage (16), a side in all the other two sides of product water flow passage (16) is provided with product water outlet (6).
3. rolling high accuracy membrane module according to claim 1, is characterized in that: described water purification diaphragm group (9) comprises a former water flow-guiding screen (11), two sheet high-precision filtration films (13) and a product water flow-guiding screen (15); Described two sheet high-precision filtration films (13) are to be formed by folding by a large high-precision filtration film (13), this folded edge be exactly former water flow passage (14) closing seam a side or produce a side of the closing seam of water flow passage (16).
4. rolling high accuracy membrane module according to claim 3, is characterized in that: described folded edge is winding shape in rolled membrane module.
5. rolling high accuracy membrane module according to claim 1, it is characterized in that: described central tube (4) is provided with inner chamber is separated into two-part seal (3), wherein a part of inner chamber is communicated with the import of former water flow passage (14), and another part inner chamber is communicated with the outlet of former water flow passage (14).
6. rolling high accuracy membrane module according to claim 5, it is characterized in that: described flow guide bar (10) is provided with one, between one end of flow guide bar (10) and described seal (3), be sealed attachment, the through former water flow passage (14) of the other end of flow guide bar (10) away from central tube (4) and the side parallel with central tube (4) axis.
7. according to the rolling high accuracy membrane module one of claim 1-6 Suo Shu, it is characterized in that: described high-precision filtration film (13) is reverse osmosis membrane, or NF membrane, or milipore filter.
8. according to the rolling high accuracy membrane module one of claim 1-6 Suo Shu, it is characterized in that: in rolling high accuracy membrane module in the shape of a spiral, its mode reducing gradually according to the width that can make former water flow passage (14) in former water flow passage (14) in water (flow) direction arranges described flow guide bar (10) obliquely.
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| CN201310506669.3A CN103521077A (en) | 2013-10-18 | 2013-10-18 | Roll-type high-precision membrane module |
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| CN201310506669.3A CN103521077A (en) | 2013-10-18 | 2013-10-18 | Roll-type high-precision membrane module |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104801193A (en) * | 2015-04-10 | 2015-07-29 | 佛山市美的清湖净水设备有限公司 | Roll type membrane filter element and filter device |
| CN105344250A (en) * | 2015-12-04 | 2016-02-24 | 江苏沁尔康环境电器有限公司 | Spiral-wound membrane component and filter element employing same |
| CN107486022A (en) * | 2016-06-13 | 2017-12-19 | 合肥科佳高分子材料科技有限公司 | A kind of round trip spiral coil type diffusion dialysis membrane module and preparation method thereof |
| WO2019037713A1 (en) * | 2017-08-21 | 2019-02-28 | 艾欧史密斯（中国）环境电器有限公司 | Membrane element and filter cartridge |
| CN109879372A (en) * | 2019-04-09 | 2019-06-14 | 吉安加仑膜环保科技股份有限公司 | The rolling ro components of inner pressed |
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2013
- 2013-10-18 CN CN201310506669.3A patent/CN103521077A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104801193A (en) * | 2015-04-10 | 2015-07-29 | 佛山市美的清湖净水设备有限公司 | Roll type membrane filter element and filter device |
| CN104801193B (en) * | 2015-04-10 | 2018-03-30 | 佛山市美的清湖净水设备有限公司 | Roll type membrane filter element and filter device |
| CN105344250A (en) * | 2015-12-04 | 2016-02-24 | 江苏沁尔康环境电器有限公司 | Spiral-wound membrane component and filter element employing same |
| CN107486022A (en) * | 2016-06-13 | 2017-12-19 | 合肥科佳高分子材料科技有限公司 | A kind of round trip spiral coil type diffusion dialysis membrane module and preparation method thereof |
| CN107486022B (en) * | 2016-06-13 | 2020-07-10 | 合肥科佳高分子材料科技有限公司 | Double-pass spiral roll type diffusion dialysis membrane module and preparation method thereof |
| WO2019037713A1 (en) * | 2017-08-21 | 2019-02-28 | 艾欧史密斯（中国）环境电器有限公司 | Membrane element and filter cartridge |
| CN109879372A (en) * | 2019-04-09 | 2019-06-14 | 吉安加仑膜环保科技股份有限公司 | The rolling ro components of inner pressed |
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