CN115888219A - Circuit board etching waste liquid treatment device - Google Patents
Circuit board etching waste liquid treatment device Download PDFInfo
- Publication number
- CN115888219A CN115888219A CN202310231204.5A CN202310231204A CN115888219A CN 115888219 A CN115888219 A CN 115888219A CN 202310231204 A CN202310231204 A CN 202310231204A CN 115888219 A CN115888219 A CN 115888219A
- Authority
- CN
- China
- Prior art keywords
- water tank
- filter plate
- circuit board
- water
- workbin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005530 etching Methods 0.000 title claims abstract description 23
- 239000002699 waste material Substances 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000000463 material Substances 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 239000012535 impurity Substances 0.000 claims description 31
- 230000005484 gravity Effects 0.000 claims description 19
- 230000010405 clearance mechanism Effects 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 2
- 239000002245 particle Substances 0.000 abstract description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 23
- 229910052802 copper Inorganic materials 0.000 abstract description 23
- 239000010949 copper Substances 0.000 abstract description 23
- 238000004140 cleaning Methods 0.000 abstract description 12
- 239000002351 wastewater Substances 0.000 abstract description 9
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000008187 granular material Substances 0.000 description 4
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 229910001431 copper ion Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- -1 open the valve Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- ing And Chemical Polishing (AREA)
Abstract
The invention discloses a circuit board etching waste liquid treatment device, which relates to the field of etching waste liquid treatment devices and comprises a first water tank, wherein a material box is arranged on the top surface of the first water tank, support plates are arranged on two sides of the material box, a second water tank is arranged on the top end of each support plate, a plurality of water outlets are connected to the bottom surface of each second water tank, a water receiving pipe matched with the water outlets is connected to the top surface of the first water tank, a motor is arranged on the top surface of the material box, and a plurality of filter plates matched with the water receiving pipe and the water outlets are rotatably connected to the output end of the motor. According to the invention, the cleaning mechanisms are arranged on the material box, the first water tank and the second water tank, when the filter plate is used, the filter plate filters copper particles in wastewater onto the filter plate, the filter plate can be turned over through the cleaning mechanisms, the surface bearing the copper particles faces downwards, then the filter plate is vibrated through the cleaning mechanisms, and the copper particles are knocked down into the material box, so that the use is more convenient.
Description
Technical Field
The invention relates to the field of etching waste liquid treatment devices, in particular to a circuit board etching waste liquid treatment device.
Background
With the rapid development of the electronic industry, the yield of printed circuit boards is increased year by year, and in the etching process for manufacturing the printed circuit boards, a large amount of alkaline etching solution or acidic etching solution is needed, and the etching solution forms etching waste liquid after being used.
When retrieving the waste liquid at present, generally through add chemical agent in waste water, the rethread stirring makes chemical agent and waste water intensive mixing for the copper ion that needs to retrieve separates out and forms solid particle, and the filter screen of reuse filters out the copper particle, carries out recycle.
But at present after coming out the copper particle filtration, need take out the filter screen and will clear up through the granule, install it on filter mechanism and reuse, work efficiency is low.
Disclosure of Invention
Based on this, the invention aims to provide a circuit board etching waste liquid treatment device, which aims to solve the technical problems that after copper particles are filtered out by the existing circuit board etching waste liquid recovery treatment device, a filter screen needs to be taken out to clean the passing particles, and the particles are installed on a filter mechanism to be reused, so that the working efficiency is low.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a circuit board etching waste liquid processing apparatus, includes first water tank, the top surface of first water tank is provided with the workbin, and the both sides of workbin all are provided with the mounting panel, the top of mounting panel is provided with the second water tank, the bottom surface of second water tank is connected with a plurality of delivery ports, and the top surface of first water tank be connected with delivery port complex water receiving pipe, the motor is installed to the workbin top surface, and the output of motor rotate be connected with a plurality ofly with water receiving pipe and delivery port complex filter plate, the top surface of workbin is located all sliding connection between the water receiving pipe has the miscellaneous case of collection, and all is provided with gravity unblock feed mechanism between miscellaneous case of collection and the workbin, install clearance mechanism on the bottom surface of second water tank and the motor.
The invention is further provided that the gravity unlocking communication mechanism comprises an insertion pipe, a receiving pipe, baffles, a support spring, gravity unlocking devices and a return spring, the insertion pipe is connected to the bottom surface of the impurity collecting box, the receiving pipe wrapping the insertion pipe is arranged on the top surface of the material box, a group of baffles matched with the insertion pipe are rotatably connected in the receiving pipe, the support spring is connected to the inner wall of each baffle and the inner wall of the receiving pipe, a group of gravity unlocking devices are arranged between the top surface of the material box and the bottom surface of the impurity collecting box, and the return spring is arranged between each gravity unlocking device.
The invention is further arranged in that the cleaning mechanism comprises a gear, an arc-shaped rack and a vibrator, the gear is arranged on a connecting shaft of the filter plate and the motor, the side surface of the motor is connected with a plurality of arc-shaped racks matched with the gear, and the bottom surface of the second water tank is provided with a plurality of vibrators corresponding to the impurity collecting tank and matched with the frame of the filter plate.
The invention is further arranged in such a way that a drain pipe is arranged at the bottom end of the side surface of the first water tank, and a valve is arranged on the drain pipe.
The invention is further arranged in that the top surface of the material box is rotatably connected with a cover, and the cover is provided with a lock catch matched with the material box.
The invention is further arranged in that the bottom surface of the material box is provided with a plurality of sections of guide rails matched with the water receiving pipe and the impurity collecting box, and two surfaces of the filter plate are both provided with sliding chutes matched with the guide rails.
The invention is further arranged that the arc-shaped rack is positioned between each group of water receiving pipes and the impurity collecting box, and the break points of the multi-section guide rails are positioned between each group of water receiving pipes and the impurity collecting box.
The invention is further set that the filter plate and the impurity collecting box are made of stainless steel materials, and the top surface of the material box is provided with openings below the arc-shaped rack.
In summary, the invention mainly has the following beneficial effects:
according to the invention, the cleaning mechanisms are arranged on the material box, the first water tank and the second water tank, when the filter plate is used, the filter plate filters copper particles in wastewater onto the filter plate, the filter plate can be turned over through the cleaning mechanisms, the surface bearing the copper particles faces downwards, then the filter plate is vibrated through the cleaning mechanisms, and the copper particles are knocked down into the material box, so that the use is more convenient.
Drawings
FIG. 1 is a schematic diagram of a first perspective of the present invention;
FIG. 2 is a schematic diagram of a second perspective of the present invention;
FIG. 3 is a cross-sectional view of the present invention;
FIG. 4 is an enlarged view of A of FIG. 2 according to the present invention;
FIG. 5 is an enlarged view of B of FIG. 3 according to the present invention.
In the figure: 1. a first water tank; 2. a material box; 3. a second water tank; 4. a mounting plate; 5. a water outlet; 6. collecting water from a pipe; 7. a motor; 8. filtering the plate; 9. a gear; 10. an arc-shaped rack; 11. a trash collection box; 12. a gravity unlocking communication mechanism; 1201. inserting a tube; 1202. a receiving tube; 1203. a baffle plate; 1204. a support spring; 1205. a gravity release; 1206. a return spring; 13. a vibrator; 14. a guide rail; 15. a chute; 16. a cover; 17. and a water discharge pipe.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance;
in the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The following describes an embodiment of the present invention based on its overall structure.
A circuit board etching waste liquid treatment device is shown in figures 1-5 and comprises a first water tank 1, a feed box 2 and a second water tank 3, wherein the feed box 2 is positioned above the first water tank 1, the feed box 2 and the second water tank 3 are connected and supported by a support plate 4, the top surface of the first water tank 1 is connected with three water receiving pipes 6, the bottom surface of the second water tank 3 is connected with three water outlets 5 which are in one-to-one correspondence with the water receiving pipes 6, electromagnetic valves are arranged on the water outlets 5, a motor 7 is arranged on the top surface of the feed box 2, the output end of the motor 7 is connected with three filter plates 8 which are matched with each group of the water receiving pipes 6 and the water outlets 5, when in use, the second water tank 3 pours waste water carrying copper particles onto the filter plates 8 through the water outlets 5 to filter out the copper particles, moisture enters the first water tank 1 through the water receiving pipes 6, and the copper particles are retained on the filter plates 8, after filtering a period of time, the electromagnetic valve closes the water outlet 5, the bottom surface of the second water tank 3 and the motor 7 are provided with a cleaning mechanism matched with the filter plate 8, after the electromagnetic valve closes the water outlet 5, the motor 7 drives the filter plate 8 to rotate, when the filter plate 8 rotates, the cleaning mechanism can turn over, the top surface of the material box 2 is provided with a impurity collecting box 11 which is positioned on the same horizontal plane with the top surface of the water receiving pipe 6 through a gravity unlocking communication mechanism 12, the filter plate 8 moves to the upper part of the impurity collecting box 11 after turning over, the cleaning mechanism cleans particles on the filter plate 8 into the impurity collecting box 11, then the filter plate 8 moves to the lower part of the next water outlet 5, the operation is repeated again, and after copper particles in the impurity collecting box 11 are accumulated to a certain weight, the gravity unlocking communication mechanism 12 unlocks so that the copper particles are collected into the material box 2.
Wherein, the filter plate 8 and the impurity collecting box 11 are both made of stainless steel materials, and the service life is longer under the power of the cleaning mechanism to the filter plate 8 and the impurity collecting box 11.
The specific structure of the gravity unlocking communication mechanism 12 is shown in fig. 5, a group of gravity unlocking devices 1205 is installed between the top surface of the material box 2 and the bottom surface of the impurity collecting box 11, and a return spring 1206 is arranged between each gravity unlocking device 1205, when the filter plate 8 is used for filtering, the gravity unlocking devices 1205 detect that the weight in the impurity collecting box 11 reaches a certain value and then unlock the impurity collecting box, the bottom surface of the impurity collecting box 11 is connected with the insertion tube 1201, the top surface of the material box 2 is provided with the receiving tube 1202 for wrapping the insertion tube 1201, the receiving tube 1202 is rotatably connected with a group of baffles 1203 matched with the insertion tube 1201, and the inner walls of each baffle 1203 and the receiving tube 1202 are connected with the support spring 1204, after unlocking, the gravity causes the impurity collecting box 11 to press down the insertion tube 1201 to push the baffles 1203 to open, copper ions fall into the material box 2, after the copper particles fall into the material box 2, the return spring 1206 pushes the impurity collecting box 11 to ascend and reset, and simultaneously, the support spring 1204 can push the baffles 1203 to rotate and reset, and the corresponding cross section of the baffles 1203 is smaller, therefore, the support spring 1204 can push the support spring 1204 to push the baffles 1203 by a smaller thrust force, and prevent the copper particles from leaking into the material box 2 when the weight of the copper particles.
Wherein, the thrust of the return spring 1206 is slightly larger than the dead weight of the impurity collecting box 11 to prevent the copper particles in the impurity collecting box 11 from not completely falling into the material box 2.
In order to take out the copper granule and the waste water that the filtration was accomplished, set up drain pipe 17 in first water tank 1 side bottom, and set up the valve on drain pipe 17, when needing to take out waste water, open the valve, waste water accessible drain pipe 17 discharges, waste water bat accomplish the back, close the valve can, rotate at the top surface of workbin 2 and connect lid 16, and set up on lid 16 with workbin 2 complex hasp, when needing to take out the copper granule, the unblock hasp, open lid 16, can take out the copper granule, take out the completion back, close lid 16, locking the hasp can.
The specific structure of the cleaning mechanism is shown in fig. 2-4, gears 9 are arranged on connecting shafts of the filter plates 8 and the motor 7, the side surfaces of the motor 7 are connected with a plurality of arc-shaped racks 10 matched with the gears 9, when the motor 7 drives the filter plates 8 to rotate, the gears 9 can be meshed with the arc-shaped racks 10, so that the filter plates 8 are turned over, a plurality of vibrators 13 corresponding to the impurity collecting tanks 11 and matched with the frames of the filter plates 8 are arranged on the bottom surface of the second water tank 3, the filter plates 8 are moved to the upper side of the impurity collecting tanks 11 after being turned over, the frames of the filter plates 8 are hit by the vibrators 13, and copper particles on the filter plates 8 fall into the impurity collecting tanks 11.
Wherein, the top surface of the feed box 2 is provided with openings below the arc-shaped rack 10, so that copper particles when the filter plate 8 is turned over can fall into the feed box 2.
On the basis of the above structure, in this embodiment, the bottom surface of the material box 2 is provided with a plurality of sections of guide rails 14 matched with the water receiving pipes 6 and the impurity collecting boxes 11, and two sides of the filter plate 8 are both provided with chutes 15 matched with the guide rails 14, so that two sides of the filter plate 8 can be matched with the guide rails 14, and the sliding of the filter plate 8 can be limited by the chutes 15 and the guide rails 14, so that the filter plate can move more stably, the arc-shaped racks 10 are located between each group of the water receiving pipes 6 and the impurity collecting boxes 11, and the breakpoints of the guide rails 14 are located between each group of the water receiving pipes 6 and the impurity collecting boxes 11, thereby preventing the guide rails 14 from influencing the turnover of the filter plate 8.
Although embodiments of the present invention have been shown and described, it is intended that the present invention should not be limited thereto, that the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples, and that modifications, substitutions, variations or the like, which are not inventive and may be made by those skilled in the art without departing from the principle and spirit of the present invention and without departing from the scope of the claims.
Claims (8)
1. The utility model provides a circuit board etching waste liquid treatment device, includes first water tank (1), its characterized in that: the top surface of first water tank (1) is provided with workbin (2), and the both sides of workbin (2) all are provided with mounting panel (4), the top of mounting panel (4) is provided with second water tank (3), the bottom surface of second water tank (3) is connected with a plurality of delivery ports (5), and the top surface of first water tank (1) be connected with delivery port (5) complex water receiving pipe (6), motor (7) are installed to workbin (2) top surface, and the output of motor (7) rotates and is connected with a plurality ofly and water receiving pipe (6) and delivery port (5) complex filter plate (8), the top surface of workbin (2) is located all sliding connection between water receiving pipe (6) has miscellaneous case (11) of collection, and all is provided with gravity unblock feed mechanism (12) between miscellaneous case (11) of collection and workbin (2), install clearance mechanism on the bottom surface of second water tank (3) and motor (7).
2. The apparatus for treating waste etching solution of circuit board as defined in claim 1, wherein: gravity unblock communicating mechanism (12) is including intubate (1201), receiver tube (1202), baffle (1203), supporting spring (1204), gravity unblock ware (1205) and reset spring (1206), the bottom surface of collection miscellaneous case (11) is connected with intubate (1201), and the top surface of workbin (2) is provided with receiver tube (1202) of parcel intubate (1201), receiver tube (1202) internal rotation is connected with a set of baffle (1203) with intubate (1201) complex, and the inner wall of every baffle (1203) and receiver tube (1202) all is connected with supporting spring (1204), all install a set of gravity unblock ware (1205) between workbin (2) top surface and collection miscellaneous case (11) bottom surface, and all be provided with reset spring (1206) between every gravity unblock ware (1205).
3. The apparatus for treating waste etching solution of circuit board according to claim 1, wherein: clearance mechanism includes gear (9), arc rack (10) and vibrator (13), all be provided with gear (9) on the connecting axle of filter plate (8) and motor (7), and the side of motor (7) all is connected with a plurality ofly and gear (9) complex arc rack (10), a plurality ofly correspond with collection miscellaneous case (11) and with filter plate (8) frame complex vibrator (13) are installed to the bottom surface of second water tank (3).
4. The apparatus for treating waste etching solution of circuit board as defined in claim 1, wherein: the water discharging pipe (17) is arranged at the bottom end of the side face of the first water tank (1), and a valve is arranged on the water discharging pipe (17).
5. The apparatus for treating waste etching solution of circuit board as defined in claim 1, wherein: the top surface of workbin (2) rotates and is connected with lid (16), and is provided with the hasp with workbin (2) complex on lid (16).
6. The apparatus for treating waste etching solution of circuit board according to claim 3, wherein: the bottom surface of the material box (2) is provided with a plurality of sections of guide rails (14) matched with the water receiving pipe (6) and the impurity collecting box (11), and two sides of the filter plate (8) are provided with sliding chutes (15) matched with the guide rails (14).
7. The apparatus for treating waste etching solution of circuit board as defined in claim 6, wherein: the arc-shaped rack (10) is positioned between each group of water receiving pipes (6) and the impurity collecting box (11), and the break points of the multi-section guide rails (14) are positioned between each group of water receiving pipes (6) and the impurity collecting box (11).
8. The apparatus for treating waste etching solution of circuit board as defined in claim 7, wherein: the filter plate (8) and the impurity collecting box (11) are made of stainless steel materials, and openings are formed in the positions, located below the arc-shaped racks (10), of the top face of the material box (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310231204.5A CN115888219A (en) | 2023-03-13 | 2023-03-13 | Circuit board etching waste liquid treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310231204.5A CN115888219A (en) | 2023-03-13 | 2023-03-13 | Circuit board etching waste liquid treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115888219A true CN115888219A (en) | 2023-04-04 |
Family
ID=86476999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310231204.5A Pending CN115888219A (en) | 2023-03-13 | 2023-03-13 | Circuit board etching waste liquid treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115888219A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013108117A (en) * | 2011-11-18 | 2013-06-06 | Toshiba Corp | Method and apparatus for recovering copper from copper etching waste liquid |
| CN209490529U (en) * | 2018-11-16 | 2019-10-15 | 四川深北电路科技有限公司 | A kind of printed wiring board film slag device for filtering and collecting |
| CN213725885U (en) * | 2020-08-13 | 2021-07-20 | 武汉北湖云峰环保科技有限公司 | Precious metal recovery unit in etching waste liquid |
| CN215242315U (en) * | 2021-06-21 | 2021-12-21 | 广州竟成塑胶模具有限公司 | Water gap cutting jig for automobile plastic panel |
| CN217709624U (en) * | 2022-05-30 | 2022-11-01 | 湖南三分地环保信息科技有限公司 | Precious metal recovery unit in etching solution |
| CN217854788U (en) * | 2022-05-12 | 2022-11-22 | 深圳市慧聪源环保科技有限公司 | Water purifying device for manufacturing ultrapure water |
| CN218221386U (en) * | 2022-09-06 | 2023-01-06 | 李仕俊 | Sewage multilayer treatment rose box |
-
2023
- 2023-03-13 CN CN202310231204.5A patent/CN115888219A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013108117A (en) * | 2011-11-18 | 2013-06-06 | Toshiba Corp | Method and apparatus for recovering copper from copper etching waste liquid |
| CN209490529U (en) * | 2018-11-16 | 2019-10-15 | 四川深北电路科技有限公司 | A kind of printed wiring board film slag device for filtering and collecting |
| CN213725885U (en) * | 2020-08-13 | 2021-07-20 | 武汉北湖云峰环保科技有限公司 | Precious metal recovery unit in etching waste liquid |
| CN215242315U (en) * | 2021-06-21 | 2021-12-21 | 广州竟成塑胶模具有限公司 | Water gap cutting jig for automobile plastic panel |
| CN217854788U (en) * | 2022-05-12 | 2022-11-22 | 深圳市慧聪源环保科技有限公司 | Water purifying device for manufacturing ultrapure water |
| CN217709624U (en) * | 2022-05-30 | 2022-11-01 | 湖南三分地环保信息科技有限公司 | Precious metal recovery unit in etching solution |
| CN218221386U (en) * | 2022-09-06 | 2023-01-06 | 李仕俊 | Sewage multilayer treatment rose box |
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Application publication date: 20230404 |