CN110984338A - Municipal drainage device - Google Patents
Municipal drainage device Download PDFInfo
- Publication number
- CN110984338A CN110984338A CN201911322067.6A CN201911322067A CN110984338A CN 110984338 A CN110984338 A CN 110984338A CN 201911322067 A CN201911322067 A CN 201911322067A CN 110984338 A CN110984338 A CN 110984338A
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- CN
- China
- Prior art keywords
- filter screen
- notches
- drainage
- grating
- grid
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/06—Gully gratings
- E03F2005/063—Gully gratings with slidable or rotatable locking elements
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sewage (AREA)
Abstract
The invention relates to a municipal drainage device which comprises drainage channels positioned on two sides of a road, wherein notches communicated with the drainage channels are respectively arranged on two sides of an opening at the top of each drainage channel, clamping grooves are correspondingly arranged on two side walls of each drainage channel at the bottom of each notch, supporting rods are erected between the bottoms of two groups of clamping grooves, a plurality of groups of rectangular frames matched with the notches are arranged in the notches in parallel along the length direction of the drainage channels, supporting plates positioned in the corresponding notches are also arranged on two sides of the bottom in each rectangular frame, a filter cover is arranged at the bottom in each rectangular frame between the two groups of supporting plates, the bottom end of each filter cover is tightly attached to the corresponding supporting rods, a grid is arranged in each rectangular frame, and an arc-shaped filter screen positioned right above the filter cover is. The invention reduces the probability of sundries depositing at the bottom of the drainage ditch through multi-stage filtration, and can effectively prevent the grid from moving while being convenient to find small articles such as keys in the drainage ditch.
Description
Technical Field
The invention relates to the technical field of municipal roads, in particular to a municipal drainage device.
Background
The drainage ditch is dug in local both sides such as walking the street all and is used for the road surface drainage, and has laid the grid apron side by side at the drainage ditch top, rainwater sees through in the grid aperture flows into the drainage ditch when so rainy day, but the pedestrian volume of walking street department is great, people often can drop coin or key etc. subaerial in carelessly, and object such as the coin or the key that drop subaerial can drop into in the drainage ditch from leaking the hole, because the key belongs to comparatively important thing, so people can be called managers and open the apron with instruments such as hook in the drainage ditch and look for article such as key basically.
However, this has the following problems: 1. a small amount of liquid can be deposited at the bottom of the drainage ditch, and impurities such as fallen leaves falling into the drainage ditch from the aperture of the grating can be soaked in the deposited liquid at the bottom of the drainage ditch, so that the cleaning is inconvenient; 2. wherein soak fallen leaves impurity in the silting liquid and can ferment rotten, object such as the key that drops to in the escape canal from the grid aperture so can be absorbed in thin rotten fermented product, people need take off it and just can seek object such as key, because the fermented product contains a large amount of bacteriums, people not only are unfavorable for people's healthy when pulling out the fermented product, also do not conveniently look for article such as key simultaneously, 3, the grid takes place the drunkenness at the escape canal top easily, lead to it can not be fine sealed with the escape canal, make the escape canal top open and take place the incident.
Disclosure of Invention
The municipal drainage device reduces the probability of sundries depositing at the bottom of the drainage ditch through multi-stage filtration, is convenient to find small objects such as keys in the drainage ditch, and can effectively prevent the grid from moving.
The technical problem of the invention is mainly solved by the following technical scheme:
a municipal drainage device comprises drainage channels positioned on two sides of a road, notches communicated with the drainage channels are respectively arranged on two sides of an open top of each drainage channel, clamping grooves are correspondingly arranged on two side walls of the drainage channel at the bottoms of the notches, supporting rods are erected between two groups of clamping grooves correspondingly, a plurality of groups of rectangular frames matched with the notches are arranged in the notches in parallel along the length direction of the drainage channels, bolts I are screwed on the two side walls of the rectangular frames, grooves used for containing the tail ends of the bolts I are formed in the side walls of the notches, supporting plates positioned in the corresponding notches are arranged on two sides of the bottom in each rectangular frame, a filter cover in a four-edge-platform structure and arranged in a back-off mode is arranged at the bottom in each rectangular frame between the two groups of supporting plates, the bottom of each filter cover is tightly attached to the supporting rods, grids are arranged in the rectangular frames, and arc-shaped filter screens positioned, and the openings at the two sides of the filter screen are provided with blocking screens for sealing the filter screen, one end of the filter screen is hinged with the bottom of one side of the grating through a hinge, the other end of the filter screen is outwards turned and folded with a folded edge closely attached to the bottom of the other side of the grating, and the folded edge is provided with a bolt II for locking the folded edge on the grating.
As a preferred scheme, the bracing piece is the screw rod, wherein the spiro union has two sets of nuts on the bracing piece, and two sets of nuts hug closely respectively on the inside wall that drainage canal corresponds.
Preferably, the distance between the bottom end of the drainage channel and the bottom end of the clamping groove is not less than 20 cm.
Preferably, the inner side wall of the rectangular frame is provided with a receiving groove for receiving the head of the bolt I.
Preferably, the grid apertures are in a quadrangular frustum structure, wherein the minimum opening ends of the grid apertures are communicated with the top of the grid, the grid apertures are positioned right above the filter screen, and the bottom end surfaces of the grid are rough surfaces.
As a preferred scheme, the filter screen and the barrier net are integrally arranged, wherein the two ends of the filter screen and the top end of the barrier net are positioned on the same horizontal plane, the top ends of the filter screen and the barrier net are tightly attached to the bottom end of the grid, and the apertures of the filter screen and the barrier net are larger than the aperture of the filter cover.
As a preferred scheme, the outer arc wall of the filter screen is welded with a reinforcing rib along the arc length.
The invention has the beneficial effects that:
1. in the invention, when liquid flows into the bottom of the drainage channel through the grating, the filter screen, the blocking net and the filter cover, the aim of filtering the liquid flowing down from the grating step by step to remove impurities and preventing the liquid from accumulating at the bottom of the drainage channel is fulfilled by the four steps.
2. The invention can take the grating out of the fixed gap and unscrew the bolt II, so that the filter screen rotates by taking the hinge as the center of a circle to open the top opening of the filter screen, thus conveniently cleaning the impurities filtered on the filter screen and cleaning the filter cover with an open top, preventing the impurities from being deposited on the filter screen and the filter cover for a long time to influence the filtering effect, and the filter screen can be opened when the grating is taken out to take out the objects such as keys and the like in the filter screen, thereby reducing the loss without searching for articles in the sludge in the drainage canal as in the past, improving the environment of the place where the articles fall, even if the articles fall through the aperture of the filter screen, the filter cover can also block the articles, thereby further reducing the probability that the articles fall into the sediment at the bottom of the drainage channel, and after the grille is opened, the dropped articles can be found in a drier environment on the filter cover to return to the owner.
3. The rectangular frame can clamp the grating to prevent the grating from horizontally displacing, so that the horizontal displacement amplitude of the grating can be well limited, the aim that the grating can well seal the top end opening of the drainage canal under the condition of no human intervention is fulfilled, and meanwhile, the bayonet and the groove can clamp the grating in the rectangular frame through the limiting part to prevent the grating from horizontally displacing in the rectangular frame.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a top plan view of a drain channel according to the present invention;
FIG. 4 is a schematic view of the structure of the filter net of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 2;
fig. 6 is another partial enlarged view of fig. 2.
In the figure: 1. drainage ditch, 2, breach, 3, draw-in groove, 4, bracing piece, 5, nut, 6, rectangular frame, 7, bolt I, 8, recess, 9, backup pad, 10, filter mantle, 11, grid, 12, filter screen, 13, block net, 14, hinge, 15, hem, 16, bolt II, 17, bayonet socket, 18, recess, 19, spacing portion.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1: the utility model provides a municipal drainage device, is including being located the escape canal 1 of road both sides, is provided with respectively in 1 open-top both sides of escape canal breach 2 with escape canal 1 intercommunication, and wherein breach 2 lateral wall and escape canal 1 lateral wall have all been pour the cement layer and water it admittedly.
Wherein be provided with the rectangular frame 6 rather than the looks adaptation in the breach 2, as shown in fig. 2, it has bolt I7 to have the spiro union on rectangular frame 6 both sides wall, and be provided with the recess 8 that is used for holding bolt I7 terminal on the breach 2 side wall, and be provided with the holding tank that is used for holding bolt I7 head on the rectangular frame 6 inside wall, make bolt I7 with rectangular frame 6 locking in breach 2, prevent that rectangular frame 6 from following breach 2 internal slipping out under not receiving human intervention, bolt I7 head is located the holding tank simultaneously, in order to prevent that its head from extending to rectangular frame 6 in and influencing other spare parts of installation in rectangular frame 6.
As shown in fig. 2, the left and right sides of the bottom in the rectangular frame 6 are provided with the supporting plates 9 located in the corresponding notches 2, the bottom in the rectangular frame 6 between the two groups of supporting plates 9 is provided with the filter cover 10 which is in a quadrangular frustum structure and is arranged in an inverted manner, the filter cover 10, the supporting plates 9 and the rectangular frame 6 are integrally arranged, the rectangular frame 6 above the filter cover 10 and the supporting plates 9 is internally provided with the grating 11 matched with the filter cover 10, meanwhile, the aperture of the filter cover 10 is smaller than that of the grating 11, primary filtration is performed on liquid flowing into the drainage channel 1 through the grating 12, secondary filtration is performed on the liquid flowing into the drainage channel 1 through the filter cover 10, so that the purpose of performing multi-stage filtration on the liquid is achieved, and bottom silting fermentation in the drainage channel 1 is prevented from being caused by large-volume impurities.
And because the grating 11 is clamped in the rectangular frame 6, the rectangular frame 6 can clamp the grating 11 to prevent the grating 11 from carrying out horizontal displacement, so that the horizontal displacement amplitude of the grating 11 can be well limited, and the purpose that the grating 11 can well seal the top end opening of the drainage channel 1 under the condition of no human intervention is achieved.
The aperture of the grating 11 in this embodiment is a quadrangular frustum pyramid structure, wherein the smallest opening end of the aperture of the grating 11 is communicated with the top of the grating 11, so that after sundries flow in from the smallest opening end of the aperture of the grating 11, the sundries which can enter the aperture of the grating 11 can basically fall out from the largest opening end at the bottom end of the grating, even if a small amount of sundries are clamped in the aperture of the grating 11, the rainwater washes the sundries in rainy days, the sundries are easily washed out due to the characteristic of the aperture of the grating 11, and further, in order to remove stubborn sundries in the aperture of the grating 11, tools such as a thin wooden stick and the like can be inserted into the aperture of the grating 11 to poke the sundries to enable the sundries to fall out, and the above modes are all helpful to reduce the probability that the sundries block the aperture of the grating 11, so that the rainwater can smoothly flow.
As shown in fig. 2, a larger gap is formed between the side wall of the filter housing 10 and the side wall of the drainage channel 1, so that the liquid in the filter housing 10 can not only flow into the bottom of the drainage channel 1 through the aperture of the bottom wall thereof, but also flow into the bottom of the drainage channel 1 through the aperture of the side wall of the filter housing 10, so that compared with the conventional method in which the liquid is filtered only through horizontally disposed filtering nets or other devices, the filter housing 10 in this embodiment increases the filtering area of the liquid through the bottom wall and the side wall, so that the liquid in the filter housing 10 can quickly flow into the drainage channel 1 at the bottom thereof through the apertures of the bottom wall and the side wall thereof, thereby improving the filtering efficiency.
As shown in fig. 2, an arc-shaped filter screen 12 located right above the filter cover 10 is further disposed at the bottom of the grille 11, two side openings of the filter screen 12 are provided with blocking nets 13 for sealing the filter screen, the filter screen 12 and the blocking nets 13 are integrally disposed, wherein the two ends of the filter screen 12 and the top ends of the blocking nets 13 are located on the same horizontal plane, the top ends of the two ends of the filter screen are tightly attached to the bottom end of the grille 11, and reinforcing ribs are welded on the outer arc wall of the filter screen 12 along the arc length of the outer arc wall to enhance the overall stability of the filter screen and prevent the filter screen from collapsing.
As shown in fig. 2, 5 and 6, the right end of the filter screen 12 is hinged to the bottom of the right side of the grating 11 by a hinge 14, wherein the left end of the filter screen 12 is folded outwards to form a folded edge 15 tightly attached to the bottom of the left side of the grating 11, and the folded edge 15 is provided with a bolt II16 for locking the folded edge on the grating 11, in this embodiment, the right end of the filter screen 12 is fixed on the grating 11 by the hinge 14, and the left end of the filter screen 12 is indirectly fixed on the grating 11 by locking the folded edge 15 on the grating 11 by a bolt II16, so that when impurities fall into the drainage channel 1 through the aperture of the grating 11, the filter screen 12 and the baffle 13 filter the impurities, and liquid flows into the filter cover 10 through the aperture of the filter screen and finally flows into the bottom of the drainage channel 1, so that the impurities do not fall into the bottom of the drainage channel 1 to, The filter screen 12, the barrier screen 13 and the filter cover 10 play a role in multi-stage filtration of liquid. The filter area of liquid has been increased through curved filter screen 12 and barrier 13 in this embodiment for the liquid that drops by grid 11 can be quick flows into drainage ditch 1 bottom through filter screen 12 and barrier 13 aperture, and filter mantle 10 also obtains increasing because filter area compares in the past, so the liquid that drops by filter screen 12 and barrier 13 aperture can also be quick flows into drainage ditch 1 bottom through filter mantle 10 aperture, thereby promotes filtration efficiency.
When workers regularly inspect or maintain, the grille 11 can be taken out of the fixing notch 2, the bolt II16 is screwed off, the filter screen 12 rotates by taking the hinge 14 as a center of a circle, the top opening of the filter screen 12 is opened, impurities filtered on the filter screen 12 can be conveniently cleaned, the situation that a large amount of impurities are deposited on the filter screen 12 for a long time to affect the filtering effect is prevented, the filter screen 12 is fixed on the grille 11 by locking the folding edge 15 through the bolt II16 after the cleaning is finished, and after people fall on the filter screen 12 through the grille 11, the filter screen 12 can be opened when the grille 11 is taken out, objects such as keys and the like in the filter screen are taken out and lost, so that the loss is reduced, articles do not need to be searched in the sediments in the drainage ditch 1 like the past, the environment where the articles fall is improved, even if the articles fall through the aperture of the filter screen 12, the filter housing 10 also retains it to further reduce the chance of the product falling into the sludge at the bottom of the drain channel 1 and to return the lost product to the home in a drier environment on the filter housing 10 after the grill 11 is opened.
In this embodiment, the bottom end surface of the grid 11 is rough to enhance the friction between the grid and the supporting plate 9.
Simultaneously, clamping grooves 3 are correspondingly arranged on two side walls of the drainage channel 1 at the bottom of the notch 2, supporting rods 4 made of screws are erected between the bottoms of the two groups of clamping grooves 3, two groups of nuts 5 are screwed on the supporting rods 4, and the two groups of nuts 5 are respectively tightly attached to the inner side walls corresponding to the drainage channel 1. Make nut 5 hug closely on 1 lateral wall in escape canal through the mode to 4 both ends rotations of bracing piece corresponding nut 5, thereby fix bracing piece 4 locking in draw-in groove 3, arrange filter mantle 10 in escape canal 1 on 4 tops of bracing piece after that, make bracing piece 4 prevent it from collapsing with the support of filter mantle 10 bottom, and strengthen the steadiness of filter mantle 10 in escape canal 1, the interval between 1 bottom in the escape canal of this embodiment and the 3 bottom of draw-in groove is not less than 20cm, make its bottom escape canal 1 have enough space to be used for the liquid circulation.
Preferably, the diameters of the filter screen 12 and the blocking mesh 13 are larger than the diameter of the filter cover 10. When liquid flows into the bottom of the drainage channel 1 through the grating 11, the filter screen 12, the blocking net 13 and the filter cover 10, the aim of filtering the liquid flowing down from the grating 11 step by step to remove impurities and preventing the liquid from accumulating at the bottom of the drainage channel 1 is fulfilled.
Example 2: a municipal drainage apparatus is substantially the same as that of embodiment 1, except that as shown in FIGS. 2, 5 and 6, a support plate 9 is provided with a strip-shaped bayonet 17, wherein the bottom of a notch 2 is provided with a groove 18 for the bayonet 17, and the bottom of a grid 11 is provided with a limiting part 19 which passes through the corresponding bayonet 17 and is inserted into the groove 18, so that a rectangular frame 6 can be further fixed in the notch 2 by inserting the limiting part 19 into the bayonet 17 and the groove 18 to prevent the grid 11 from horizontally displacing, and the bayonet 17 and the groove 18 can also clamp the grid 11 in the rectangular frame 6 by the limiting part 19 to prevent the grid 11 from horizontally displacing in the rectangular frame 6.
The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. A municipal drainage device comprises drainage channels positioned on two sides of a road, and is characterized in that notches communicated with the drainage channels are respectively arranged on two sides of an opening at the top of each drainage channel, clamping grooves are correspondingly arranged on two side walls of the drainage channels at the bottoms of the notches, supporting rods are erected between two groups of clamping grooves correspondingly, a plurality of groups of rectangular frames matched with the notches are arranged in the notches in parallel along the length direction of the drainage channels, bolts I are screwed on the two side walls of the rectangular frames, grooves for containing the tail ends of the bolts I are arranged on the side walls of the notches, supporting plates positioned in the corresponding notches are arranged on two sides of the bottom in each rectangular frame, a filter cover which is of a four-edge-frustum structure and is arranged in an inverted manner is arranged at the bottom in each rectangular frame between the two groups of the supporting plates, wherein the bottom of the filter cover is tightly attached, the bottom of the grating is provided with an arc-shaped filter screen which is positioned right above the filter cover, openings on two sides of the filter screen are provided with blocking screens which seal the filter screen, one end of the filter screen is hinged with the bottom of one side of the grating through a hinge, the other end of the filter screen is outwards turned and folded to form a folding edge which is tightly attached to the bottom of the other side of the grating, and the folding edge is provided with a bolt II which locks the folding edge on the grating.
2. The municipal drainage device of claim 1, wherein the support rod is a threaded rod, and wherein two sets of nuts are threaded onto the support rod and are respectively attached to the corresponding inner side walls of the drainage channel.
3. The municipal drainage device of claim 1, wherein the distance between the bottom end of the drainage channel and the bottom end of the channel is not less than 20 cm.
4. The municipal drainage device according to claim 1, wherein the rectangular frame is provided with receiving grooves for receiving the heads of bolts I.
5. The municipal drainage device according to claim 1, wherein the grid apertures are in a quadrangular frustum structure, wherein the smallest open ends of the grid apertures communicate with the top of the grid, the grid apertures are located right above the inside of the filter screen, and wherein the bottom end surfaces of the grid are rough.
6. The municipal drainage device according to claim 1, wherein the filter screen and the barrier are integrally arranged, wherein the two ends of the filter screen and the top end of the barrier are in the same horizontal plane, the top ends of the filter screen and the top end of the barrier are tightly attached to the bottom end of the grid, and the pore sizes of the filter screen and the barrier are larger than those of the filter cover.
7. The municipal drainage device of claim 1, wherein the outer arcuate wall of the filter screen is welded along its arcuate length with reinforcing ribs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911322067.6A CN110984338A (en) | 2019-12-19 | 2019-12-19 | Municipal drainage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911322067.6A CN110984338A (en) | 2019-12-19 | 2019-12-19 | Municipal drainage device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110984338A true CN110984338A (en) | 2020-04-10 |
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ID=70065662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911322067.6A Pending CN110984338A (en) | 2019-12-19 | 2019-12-19 | Municipal drainage device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110984338A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112064767A (en) * | 2020-09-18 | 2020-12-11 | 夏克全 | Municipal pipe network structure and municipal pipe network structure clearing construction method |
| CN112081219A (en) * | 2020-09-09 | 2020-12-15 | 王世铎 | Water conservancy drainage system |
| CN112142218A (en) * | 2020-10-22 | 2020-12-29 | 张劲松 | Environment-friendly ecological ditch water quality purification device and purification method |
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| DE202007014331U1 (en) * | 2007-10-12 | 2008-01-03 | Roval Umwelt Technologien Vertriebsgesellschaft Mbh | Sewerage inlet |
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| CN207003617U (en) * | 2017-07-24 | 2018-02-13 | 鞠一帆 | A kind of Quick drainage groove of highway |
| CN207436209U (en) * | 2017-11-06 | 2018-06-01 | 上海宝冶集团南京建筑有限公司 | A kind of municipal works multiple filtration gutter inlet device |
| CN108755908A (en) * | 2018-05-17 | 2018-11-06 | 温州市宏泰市政园林建设有限公司 | A kind of catch-basin of the municipal drainage with filtering function and convenient for flood discharge |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993005248A1 (en) * | 1991-09-02 | 1993-03-18 | Yenice Limited | Separator means for separating problem waste from effluent |
| DE202007014331U1 (en) * | 2007-10-12 | 2008-01-03 | Roval Umwelt Technologien Vertriebsgesellschaft Mbh | Sewerage inlet |
| CN204510423U (en) * | 2014-12-17 | 2015-07-29 | 北京建筑大学 | A kind of foldable roof drain pollutant interception |
| CN206052937U (en) * | 2016-09-14 | 2017-03-29 | 尹俊凯 | Rain perforaled strainer with warning mark |
| CN207003617U (en) * | 2017-07-24 | 2018-02-13 | 鞠一帆 | A kind of Quick drainage groove of highway |
| CN107460943A (en) * | 2017-09-13 | 2017-12-12 | 陈奕彦 | A kind of Novel drain draining inner core and the floor drain with the inner core |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081219A (en) * | 2020-09-09 | 2020-12-15 | 王世铎 | Water conservancy drainage system |
| CN112081219B (en) * | 2020-09-09 | 2022-02-01 | 王世铎 | Water conservancy drainage system |
| CN112064767A (en) * | 2020-09-18 | 2020-12-11 | 夏克全 | Municipal pipe network structure and municipal pipe network structure clearing construction method |
| CN112142218A (en) * | 2020-10-22 | 2020-12-29 | 张劲松 | Environment-friendly ecological ditch water quality purification device and purification method |
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Application publication date: 20200410 |
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