CN112090131A - Self-cleaning system for filter screen of inspection well cover in green city - Google Patents

Self-cleaning system for filter screen of inspection well cover in green city Download PDF

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Publication number
CN112090131A
CN112090131A CN202010956906.6A CN202010956906A CN112090131A CN 112090131 A CN112090131 A CN 112090131A CN 202010956906 A CN202010956906 A CN 202010956906A CN 112090131 A CN112090131 A CN 112090131A
Authority
CN
China
Prior art keywords
filter screen
fixedly connected
water
air
inspection well
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.)
Withdrawn
Application number
CN202010956906.6A
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Chinese (zh)
Inventor
曹钰坤
陈锦波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202010956906.6A priority Critical patent/CN112090131A/en
Publication of CN112090131A publication Critical patent/CN112090131A/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6407—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes
    • B01D29/6415—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
    • 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
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Filtration Of Liquid (AREA)

Abstract

The invention discloses a green city inspection well cover filter screen self-cleaning system which comprises a cover body, wherein a plurality of water inlet channels are arranged on the upper side wall of the cover body, a drainage groove is arranged on the lower side wall of the cover body, and a filter screen is fixedly connected to the inner wall of the drainage groove; the utility model discloses a clean filter screen, including the lid, be equipped with the clean mechanism that is used for clean filter screen in the lid, clean mechanism is including setting up two intercommunication grooves at water drainage tank internal top, the inside control chamber that is equipped with of lid, control intracavity wall sliding connection has places the board, bottom fixedly connected with gasbag in the control chamber, gasbag lateral wall intercommunication is equipped with the breathing pipe, place the board on lateral wall fixedly connected with meet water inflation stagnant water piece, be equipped with the installation cavity in the lid, the installation cavity passes through air duct and gasbag intercommunication, installation intracavity wall fixedly connected with baffle. The invention can automatically brush off the sludge attached to the filter screen, ensure the drainage performance of the inspection well cover and further ensure the normal circulation of urban traffic.

Description

Self-cleaning system for filter screen of inspection well cover in green city
Technical Field
The invention relates to the technical field of urban construction equipment, in particular to a green urban inspection well cover filter screen self-cleaning system.
Background
The inspection well cover is urban road drainage equipment, and is usually arranged, the inspection well cover is slightly lower than a road surface, water on the road surface can be collected onto the inspection well cover and then is discharged through the inspection well cover, so that serious water accumulation on the road surface in heavy rainfall weather can be prevented, and the normal circulation of urban traffic can be ensured.
However, when the existing inspection well cover is used, because a large amount of soil exists on the road, the soil enters the inspection well cover along with water flow, the soil is attached to the inspection well cover in a sludge manner, the inspection well cover is easily blocked, the drainage function of the inspection well cover is lowered, accumulated water on the road surface cannot be drained timely, serious accumulated water is generated on the road surface, urban traffic is affected, and therefore the self-cleaning system for the green urban inspection well cover filter screen is required to be designed to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a self-cleaning system for a green urban inspection well cover filter screen.
In order to achieve the purpose, the invention adopts the following technical scheme:
a green city inspection well cover filter screen self-cleaning system comprises a cover body, wherein a plurality of water inlet channels are arranged on the upper side wall of the cover body, a drainage groove is arranged on the lower side wall of the cover body, and a filter screen is fixedly connected to the inner wall of the drainage groove;
a cleaning mechanism for cleaning the filter screen is arranged in the cover body, the cleaning mechanism comprises two communicating grooves arranged at the top in the drainage groove, a control cavity is arranged in the cover body, the inner wall of the control cavity is connected with a placing plate in a sliding way, the bottom in the control cavity is fixedly connected with an air bag, the side wall of the air bag is communicated with an air suction pipe, the side wall of the placing plate is fixedly connected with a water-swelling water stop block, the cover body is internally provided with an installation cavity which is communicated with the air bag through an air duct, the inner wall of the installation cavity is fixedly connected with a clapboard, the side wall of the clapboard is provided with an air injection pipe in a penetrating way, the pipe orifice of the air injection pipe far away from one end of the clapboard is communicated with a high-pressure air nozzle, the utility model discloses a water drainage tank, including filter screen, rotor, installation intracavity and the lateral wall of filter screen, the lateral wall rotates through the bearing and is connected with the bull stick, the bull stick extends to a plurality of flabellums of installation intracavity and fixedly connected with, the lateral wall fixedly connected with two brush boards that the bull stick is located the water drainage tank.
Preferably, a first one-way valve is arranged on the air guide tube, a second one-way valve is arranged on the air suction tube, a waterproof breathable film is arranged at one end, away from the air bag, of the air suction tube, a pressure valve is arranged on the air jet tube, and the high-pressure air nozzle is arranged right opposite to the fan blade.
Preferably, the cross section of the control cavity is annular, and the cross sections of the air bag, the placing plate and the water-swelling water stop block are all annular.
Preferably, the two communicating grooves are communicated with the control cavity, the sections of the two communicating grooves are of inverted J-shaped structures, and the inner walls of the two communicating grooves are fixedly connected with sand-based permeable plates.
Preferably, the inner wall of the mounting cavity is fixedly connected with a mounting bar, and the side wall of the mounting bar is fixedly connected with a tuning fork.
Preferably, the tuning fork transversely sets up, lateral wall and the installation cavity interior top laminating on the tuning fork, lateral wall and the baffle side wall laminating on under the tuning fork.
The invention has the following beneficial effects:
1. compared with the prior art, when the sludge on the filter screen of the inspection well cover is excessive, accumulated water enters the control cavity through the communicating groove, the water swelling and water stopping block is swelled, the placing plate is pushed to move, air in the air bag is extruded into the mounting cavity, the air is sprayed out from the high-pressure air nozzle at high speed, the fan blades and the rotating rod are blown to rotate, the brush plate is driven to rotate, the sludge attached to the filter screen can be automatically brushed off, the drainage performance of the inspection well cover is guaranteed, the normal circulation of urban traffic is guaranteed, manual operation is not needed, and the time and energy of workers are saved;
2. compared with the prior art, when a vehicle passes through the device, tuning fork resonance is caused by the booming of an engine, and the tuning fork continuously rubs with the inner wall of the mounting cavity and the partition plate, so that the temperature of air in the mounting cavity is increased, the air in the mounting cavity can reach the critical value of the pressure valve more quickly, the waiting time of the device for cleaning the filter screen is shortened, and the drainage function of the inspection well cover can be recovered to be normal more quickly;
3. compared with the prior art, the air in the installation cavity can reach the critical value of the pressure valve more quickly through the vibration of the tuning fork, namely the water-swelling water-stop block can extrude the air from the high-pressure air nozzle only by absorbing a small amount of water, so that the time required for finishing the evaporation of the water in the water-swelling water-stop block is shortened, the water-swelling water-stop block is prevented from being in a water accumulation state for a long time, and the service life of the water-swelling water-stop block can be prolonged.
Drawings
FIG. 1 is a schematic structural diagram of a green urban inspection well cover filter screen self-cleaning system provided by the invention;
FIG. 2 is an enlarged view of a structure at the position A of the green urban inspection well cover filter screen self-cleaning system provided by the invention;
FIG. 3 is an enlarged view of a structure at a position B of the green urban inspection well cover filter screen self-cleaning system provided by the invention;
fig. 4 is a schematic structural diagram of a green city inspection well cover filter screen self-cleaning system provided in embodiment 2 of the present invention.
In the figure: 1 lid, 2 inlet channels, 3 water drainage tank, 4 filter screens, 5 brush boards, 6 bull sticks, 7 intercommunication grooves, 8 installation cavities, 9 baffles, 10 air ducts, 11 breathing pipes, 12 waterproof ventilated membrane, 13 control chambers, 14 gasbags, 15 place the board, 16 meet water inflation stagnant water piece, 17 sand base porous disc, 18 gas ejector pipes, 19 high-pressure air nozzles, 20 flabellum, 21 tuning fork.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
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", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1-3, a green city inspection shaft lid filter screen automatically cleaning system, includes lid 1, and 1 lateral wall of lid is equipped with a plurality of inlet channels 2, and 1 lateral wall of lid is equipped with water drainage tank 3, and a plurality of inlet channels 2 all communicate with water drainage tank 3, and 3 inner wall fixedly connected with filter screens 4 of water drainage tank.
A cleaning mechanism for cleaning a filter screen 4 is arranged in a cover body 1, the cleaning mechanism comprises two communicating grooves 7 arranged at the top in a drainage groove 3, the sections of the two communicating grooves 7 are of inverted J-shaped structures, sand-based permeable plates 17 are fixedly connected to the inner walls of the two communicating grooves 7, the sand-based permeable plates 17 can prevent dust from passing through the communicating grooves 7, but have good water seepage and water permeability, a control cavity 13 is arranged in the cover body 1, the cross section of the control cavity 13 is annular, the two communicating grooves 7 are both communicated with the control cavity 13, a placing plate 15 is slidably connected to the inner wall of the control cavity 13, the side wall of the placing plate 15 is attached to the inner wall of the control cavity 13 to prevent water from flowing to the lower end of the placing plate 15, an air bag 14 is fixedly connected to the bottom in the control cavity 13, the upper side wall of the air bag 14 is in contact with the lower side wall of, the second one-way valve limits air to flow into the air bag 14 only from the air suction pipe 11, a waterproof breathable film 12 is arranged at one end, far away from the air bag 14, of the air suction pipe 11, the waterproof breathable film 12 can prevent water on the road surface from entering the air bag 14 through the air suction pipe 11 but can allow air to pass through, a water-swelling water stop block 16 is fixedly connected to the side wall of the placing plate 15, the water-swelling water stop block 16 can absorb water and swell after being in contact with water and can recover to the original shape after water is evaporated, and the cross sections of the air bag 14, the placing plate 15 and the water-swelling water stop block 16;
be equipped with installation cavity 8 in the lid 1, installation cavity 8 passes through air duct 10 and 14 intercommunications of gasbag, be equipped with first check valve on the air duct 10, first check valve restriction air only can follow 14 flows into air duct 10 in the gasbag, 8 inner wall fixedly connected with baffles 9 of installation cavity, 9 lateral walls of baffle run through and are equipped with jet-propelled pipe 18, be equipped with the pressure valve on the jet-propelled pipe 18, the pressure valve only just can open when the atmospheric pressure of baffle 9 upper end reaches the critical value of pressure valve, the mouth of pipe department intercommunication that jet-propelled pipe 18 kept away from 9 one end of baffle is equipped with high-pressure air cock 19, the lateral wall is rotated through the bearing on 4 of filter screen and is connected with bull stick 6, bull stick 6 extends to installation cavity 8 in and a plurality of flabellum 20 of fixedly connected with, high-pressure air cock 19 is just to flabellum 20 setting, two brush boards 5 of lateral wall fixedly connected.
In the invention, when the sludge attached to the filter screen 4 is excessive, the filtering performance of the filter screen 4 is poor, accumulated water is formed at the upper end and gradually increases, the accumulated water enters the control cavity 13 through the communicating groove 7, after the water-swelling water stop block 16 contacts with water, the upper end can only swell downwards due to the obstruction of the sand-based water permeable plate 17, the placing plate 15 is pushed to move downwards, the placing plate 15 extrudes the air bag 14, the air in the air bag 14 is continuously extruded into the mounting cavity 8 and is accumulated at the upper end of the partition plate 9, when the air pressure at the upper end of the partition plate 9 reaches the critical value of the pressure valve, the air is ejected from the high-pressure air nozzle 19 at a high speed and impacts the fan blade 20 to rotate the fan blade 20, further, the rotating rod 6 is driven to rotate the brush plate 5, impurities such as the sludge on the filter screen 4 are brushed off.
When filter screen 4 resumes unblocked, ponding flows to the lower extreme through filter screen 4, and most ponding in the intercommunication groove 7 also discharge through water drainage tank 3, and the back is absorbed by meeting water inflation stagnant water piece 16 to a small part ponding, evaporates gradually when earth's surface temperature risees daytime, and after the evaporation of water, meet water inflation stagnant water piece 16 reconversion, gasbag 14 also reconversion to inhale the air from breathing pipe 11.
Example 2
Referring to fig. 4, a green city inspection shaft lid filter screen is from cleaning system, 8 inner walls fixedly connected with mounting bars of mounting chamber, mounting bar lateral wall fixedly connected with tuning fork 21, tuning fork 21 transversely sets up, lateral wall and the 8 interior top laminating of mounting chamber on the tuning fork 21, lateral wall and the 9 side wall laminating of baffle on the tuning fork 21.
In this embodiment, when a vehicle passes by, the booming of the automobile engine causes the tuning fork 21 to resonate, the tuning fork 21 continuously rubs against the installation cavity 8 and the partition plate 9, the temperature of the installation cavity 8 and the partition plate 9 can be raised, and the temperature of the air in the installation cavity 8 is gradually raised, because the higher the temperature is, the higher the air pressure is, compared with embodiment 1, the air pressure in the installation cavity 8 can reach the critical value of the pressure valve more quickly, so that the air can be ejected from the high-pressure air nozzle 19 more quickly, the waiting time required by the device to clean the filter screen 4 is shortened, meanwhile, the water-swelling water-stopping block 16 can extrude the air from the high-pressure air nozzle 19 under the condition of absorbing a small amount of water, the time required by the evaporation of the water in the water-swelling water-stopping block 16 is also shortened, and the water-swelling water-stopping block 16 is prevented from being in the water-standing, the service life of the water-swellable water-stop block 16 is extended.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The utility model provides a green city inspection shaft lid filter screen automatically cleaning system, includes lid (1), its characterized in that: the water inlet device is characterized in that a plurality of water inlet channels (2) are arranged on the upper side wall of the cover body (1), a water drainage groove (3) is arranged on the lower side wall of the cover body (1), and a filter screen (4) is fixedly connected to the inner wall of the water drainage groove (3);
the cleaning mechanism for cleaning the filter screen (4) is arranged in the cover body (1), the cleaning mechanism comprises two communicating grooves (7) arranged at the top in the drainage groove (3), a control cavity (13) is arranged in the cover body (1), a placing plate (15) is connected to the inner wall of the control cavity (13) in a sliding manner, an air bag (14) is fixedly connected to the bottom in the control cavity (13), an air suction pipe (11) is arranged in the side wall of the air bag (14) in a communicating manner, a water-swelling water stop block (16) is fixedly connected to the side wall of the placing plate (15), an installation cavity (8) is arranged in the cover body (1), the installation cavity (8) is communicated with the air bag (14) through an air guide pipe (10), a partition plate (9) is fixedly connected to the inner wall of the installation cavity (8), an air injection pipe (18) penetrates through the side wall of the partition plate (9), and a high-pressure air nozzle (19, the side wall is connected with bull stick (6) through the bearing rotation on filter screen (4), bull stick (6) extend to installation cavity (8) in and a plurality of flabellum of fixedly connected with (20), two brush boards of lateral wall fixedly connected with (5) that bull stick (6) are located water drainage tank (3).
2. The self-cleaning system for the green urban inspection well cover filter screen according to claim 1, characterized in that: the air duct (10) is provided with a first one-way valve, the air duct (11) is provided with a second one-way valve, one end of the air duct (11) far away from the air bag (14) is provided with a waterproof breathable film (12), the air jet pipe (18) is provided with a pressure valve, and the high-pressure air nozzle (19) is arranged right opposite to the fan blade (20).
3. The self-cleaning system for the green urban inspection well cover filter screen according to claim 1, characterized in that: the cross section of the control cavity (13) is annular, and the cross sections of the air bag (14), the placing plate (15) and the water-swelling water-stopping block (16) are annular.
4. The self-cleaning system for the green urban inspection well cover filter screen according to claim 1, characterized in that: the two communicating grooves (7) are communicated with the control cavity (13), the sections of the two communicating grooves (7) are of inverted J-shaped structures, and the inner walls of the two communicating grooves (7) are fixedly connected with sand-based permeable plates (17).
5. The self-cleaning system for the green urban inspection well cover filter screen according to claim 1, characterized in that: the mounting cavity (8) inner wall fixedly connected with mounting bar, mounting bar lateral wall fixedly connected with tuning fork (21).
6. The self-cleaning system for the green urban inspection well cover filter screen according to claim 5, characterized in that: tuning fork (21) transversely sets up, top laminating in lateral wall and installation cavity (8) is gone up in tuning fork (21), lateral wall and baffle (9) side wall laminating under tuning fork (21).
CN202010956906.6A 2020-09-12 2020-09-12 Self-cleaning system for filter screen of inspection well cover in green city Withdrawn CN112090131A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010956906.6A CN112090131A (en) 2020-09-12 2020-09-12 Self-cleaning system for filter screen of inspection well cover in green city

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010956906.6A CN112090131A (en) 2020-09-12 2020-09-12 Self-cleaning system for filter screen of inspection well cover in green city

Publications (1)

Publication Number Publication Date
CN112090131A true CN112090131A (en) 2020-12-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010956906.6A Withdrawn CN112090131A (en) 2020-09-12 2020-09-12 Self-cleaning system for filter screen of inspection well cover in green city

Country Status (1)

Country Link
CN (1) CN112090131A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112827226A (en) * 2021-01-19 2021-05-25 张俊志 Well water filtering structure of monitoring well
CN112845319A (en) * 2021-01-27 2021-05-28 滁州市友邦涂装有限公司 Pretreatment device of spraying line of dish washer parts
CN113247499A (en) * 2021-04-14 2021-08-13 覃建林 Small-size fixed rubbish compression equipment
CN114486358A (en) * 2022-01-25 2022-05-13 江苏宜测检测科技有限公司 River water quality detection sampling method and device
CN115301004A (en) * 2022-06-10 2022-11-08 江苏金牛星电子科技有限公司 Intelligent bus electronic stop board of smart city

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112827226A (en) * 2021-01-19 2021-05-25 张俊志 Well water filtering structure of monitoring well
CN112845319A (en) * 2021-01-27 2021-05-28 滁州市友邦涂装有限公司 Pretreatment device of spraying line of dish washer parts
CN113247499A (en) * 2021-04-14 2021-08-13 覃建林 Small-size fixed rubbish compression equipment
CN114486358A (en) * 2022-01-25 2022-05-13 江苏宜测检测科技有限公司 River water quality detection sampling method and device
CN114486358B (en) * 2022-01-25 2023-10-13 江苏宜测检测科技有限公司 River water quality detection sampling method and device
CN115301004A (en) * 2022-06-10 2022-11-08 江苏金牛星电子科技有限公司 Intelligent bus electronic stop board of smart city
CN115301004B (en) * 2022-06-10 2024-04-19 江苏金牛星电子科技有限公司 Intelligent public transport electronic stop board of smart city

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Application publication date: 20201218

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