CN109052519A - A kind of water environment ecological restoration device - Google Patents
A kind of water environment ecological restoration device Download PDFInfo
- Publication number
- CN109052519A CN109052519A CN201811253968.XA CN201811253968A CN109052519A CN 109052519 A CN109052519 A CN 109052519A CN 201811253968 A CN201811253968 A CN 201811253968A CN 109052519 A CN109052519 A CN 109052519A
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- China
- Prior art keywords
- shielded box
- water environment
- ecological restoration
- water
- restoration device
- 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.)
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000000463 material Substances 0.000 claims abstract description 42
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 239000010960 cold rolled steel Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000006870 function Effects 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001303 quality assessment method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/008—Mobile apparatus and plants, e.g. mounted on a vehicle
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Catching Or Destruction (AREA)
Abstract
The invention discloses a kind of water environment ecological restoration devices, including hull, support frame, shielded box and control keyboard, the hull top surface is provided with support frame as described above, feed hopper is provided on support frame as described above, the feed hopper bottom surface is provided with conveying pipeline, the conveying pipeline bottom surface is provided with discharge nozzle, solenoid valve is provided on the discharge nozzle, support frame as described above side is provided with the shielded box, the shielded box top surface is provided with end cap, handle is provided on the end cap, the shielded box side is provided with radiator window.Beneficial effect is: using Ship Structure, hull can be driven to move freely in water environment by prime mover, water quality information and ion concentration information in water environment can be obtained by water quality sensor and ion transducer in real time simultaneously, and aquatic ecological restoration is carried out to different materials is put into water environment by multiple storage bins, different aquatic ecological restorations has been adapted to, a wide range of utilization and extention of device is conducive to.
Description
Technical field
The present invention relates to water environment apparatus fields, more particularly to a kind of water environment ecological restoration device.
Background technique
Water environment refers to the formation, distribution of water in nature and converts the environment in locating space.Refer to around crowd space
And can directly or indirectly influence the water body of human lives and development, the various natural causes of normal function and it is related society because
The totality of element.Also some refer to it is metastable, using land as the environment in space locating for the natural water area on boundary.At the earth's surface,
Coverage of water accounts for about the 71% of earth surface product.Water is made of ocean water and two part of terrestrial water, respectively with total Water
97.28% and 2.72%.Sum-rate very little shared by the latter, and the environment in locating space is sufficiently complex.Water is in not on earth
The dynamic balance state of disconnected circulation.The basic chemical component and content of natural water reflect it and are circulated throughout in different natural environments
Original physical chemical property in journey, be research water environment in element exist, migration and conversion and environmental quality (or pollution journey
Degree) with the basic foundation of water quality assessment.Application No. is 201710102082.4 Chinese patents, disclose a kind of for water environment
The prosthetic device of ecology, described device includes: to repair bed in chinampa and the water for being connected to chinampa lower end;Chinampa includes framework, frame
Body is provided with filter screen;The above-mentioned prosthetic device structure for water environment ecology is fixed, and can not be moved, can not be adapted in use
Different water environments.
Summary of the invention
The object of the invention is that providing a kind of water environment ecological restoration device to solve the above-mentioned problems.
The present invention through the following technical solutions to achieve the above objectives:
A kind of water environment ecological restoration device, including hull, support frame, shielded box and control keyboard, the hull top surface setting
There is support frame as described above, feed hopper is provided on support frame as described above, the feed hopper bottom surface is provided with conveying pipeline, the conveying pipeline bottom
Face is provided with discharge nozzle, is provided with solenoid valve on the discharge nozzle, and support frame as described above side is provided with the shielded box, it is described every
Case top surface is provided with end cap, handle is provided on the end cap, the shielded box side is provided with radiator window, the shielded box
Inner bottom surface is provided with supporter, storage bin is provided on the supporter, the supporter side is provided with battery, described
Shielded box side is provided with mounting rack, and solar energy film plate is provided on the mounting rack, and the mounting rack is internally provided with always
Bus, the hull interior bottom surface are provided with prime mover, and the hull bottom surface is provided with caisson, the caisson side setting
There is water inlet pipe, the caisson another side is provided with outlet pipe, is provided with strainer on the water inlet pipe and the outlet pipe, institute
It states caisson inside top surface and is provided with mounting plate, water quality sensor, the water quality sensor side are provided on the mounting plate
It is provided with ion transducer, the shielded box surface is provided with control host, is provided with display screen on the control host, described
Display screen side is provided with the control keyboard.
In the present embodiment, the material of support frame as described above is mild steel, and solid construction, the shape of the feed hopper is funnel
Type, the volume of the feed hopper are not less than 5L, and the material of the conveying pipeline is aluminium alloy, and wall thickness is not less than 3mm.
In the present embodiment, the material of the discharge nozzle is identical as the conveying pipeline, and the discharge nozzle and the conveying pipeline are logical
Cross threaded connection, the action response time of the solenoid valve is no more than 1s, the solenoid valve by screw element be fixed on it is described out
In expects pipe.
In the present embodiment, the material of the shielded box is cold-rolled steel sheet, and the thickness of the shielded box is not less than 5mm, described
End cap is connect with the shielded box by pin shaft, and the material of the handle is quenched rubber, and the quantity of the radiator window is not less than
Six.
In the present embodiment, the material of the supporter is quenched rubber, and the quantity of the storage bin is described not less than two
Battery is serial lithium battery group, and the maximum output current of the battery is not higher than 30A.
In the present embodiment, the material of the mounting rack is mild steel, hollow structure, the radiation function of the solar energy film plate
Rate is not less than 40uw/cm2, for the thickness of the solar energy film plate not less than 0.5mm, total bus is heatproof cable.
In the present embodiment, described prime mover is servo motor, and the material of the caisson is PVC, and the caisson passes through
Screw is fixed on the hull, and the cross sectional shape of the water inlet pipe and the outlet pipe is consistent, the mesh number of the strainer
Not less than 200, the strainer is fixed on the caisson by grab.
In the present embodiment, the material of the mounting plate is ABS engineering plastics, and the mounting plate welding is in the caisson
Interior, the work refreshing frequency of the water quality sensor is not less than 60HZ, and the working method of the ion transducer is contact.
In the present embodiment, the model PLC S7-200CN of the control host, the material of the display screen is IPS, institute
Control keyboard is stated to be embedded on the control host.
In the present embodiment, the control host and the display screen, the solenoid valve, described prime mover, total bus,
The battery, the water quality sensor, the ion transducer, the solar energy film plate and the control keyboard are electrically connected
It connects.
The beneficial effects of the present invention are: Ship Structure is used, hull can be driven freely to move in water environment by prime mover
It moves, while water quality information and ion concentration letter in water environment can be obtained in real time by water quality sensor and ion transducer
Breath, and aquatic ecological restoration is carried out to different materials is put into water environment by multiple storage bins, adapt to different water environments
It repairs, is conducive to a wide range of utilization and extention of device.
Detailed description of the invention
Fig. 1 is a kind of exterior view of water environment ecological restoration device of the present invention;
Fig. 2 is a kind of interior view of water environment ecological restoration device of the present invention;
Fig. 3 is a kind of top view of water environment ecological restoration device of the present invention;
Fig. 4 is a kind of side view of water environment ecological restoration device of the present invention.
1, feed hopper;2, support frame;3, hull;4, discharge nozzle;5, caisson;6, mounting rack;7, shielded box;8, it radiates
Window;9, handle;10, end cap;11, conveying pipeline;12, solenoid valve;13, prime mover;14, supporter;15, storage bin;16, electric power storage
Pond;17, outlet pipe;18, ion transducer;19, mounting plate;20, water quality sensor;21, water inlet pipe;22, strainer;23, total female
Line;24, host is controlled;25, display screen;26, control keyboard;27, solar energy film plate.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Embodiment one:
As Figure 1-Figure 4, a kind of water environment ecological restoration device, including hull 3, support frame 2, shielded box 7 and control keyboard
26,3 top surface of hull is provided with support frame as described above 2, and feed hopper 1,1 bottom surface of feed hopper are provided on support frame as described above 2
It is provided with conveying pipeline 11,11 bottom surface of conveying pipeline is provided with discharge nozzle 4, and solenoid valve 12 is provided on the discharge nozzle 4, described
2 side of support frame is provided with the shielded box 7, and 7 top surface of shielded box is provided with end cap 10, is provided with hand on the end cap 10
Handle 9,7 side of shielded box are provided with radiator window 8, and 7 inner bottom surface of shielded box is provided with supporter 14, the supporter
Storage bin 15 is provided on 14,14 side of supporter is provided with battery 16, and 7 side of shielded box is provided with mounting rack
6, it is provided with solar energy film plate 27 on the mounting rack 6, the mounting rack 6 is internally provided with total bus 23, in the hull 3
Portion bottom surface is provided with prime mover 13, and 3 bottom surface of hull is provided with caisson 5, and 5 side of caisson is provided with water inlet pipe
21,5 another side of caisson is provided with outlet pipe 17, is provided with strainer on the water inlet pipe 21 and the outlet pipe 17
22,5 inside top surface of caisson is provided with mounting plate 19, and water quality sensor 20, the water are provided on the mounting plate 19
20 side of matter sensor is provided with ion transducer 18, and 7 surface of shielded box is provided with control host 24, the control host
Display screen 25 is provided on 24,25 side of display screen is provided with the control keyboard 26.
In the present embodiment, the material of support frame as described above 2 is mild steel, and solid construction, the shape of the feed hopper 1 is funnel
Type, the volume of the feed hopper 1 are not less than 5L, and the material of the conveying pipeline 11 is aluminium alloy, and wall thickness is not less than 3mm.
In the present embodiment, the material of the discharge nozzle 4 is identical as the conveying pipeline 11, the discharge nozzle 4 and the conveying
Pipe 11 is connected through a screw thread, and the action response time of the solenoid valve 12 is no more than 1s, and the solenoid valve 12 is solid by screw element
It is scheduled on the discharge nozzle 4.
In the present embodiment, the material of the shielded box 7 is cold-rolled steel sheet, and the thickness of the shielded box 7 is not less than 5mm, institute
It states end cap 10 to connect with the shielded box 7 by pin shaft, the material of the handle 9 is quenched rubber, the quantity of the radiator window 8
Not less than six.
In the present embodiment, the material of the supporter 14 is quenched rubber, and the quantity of the storage bin 15 is not less than two,
The battery 16 is serial lithium battery group, and the maximum output current of the battery 16 is not higher than 30A.
In the present embodiment, the material of the mounting rack 6 is mild steel, hollow structure, the spoke of the solar energy film plate 27
Power is penetrated not less than 40uw/cm2, for the thickness of the solar energy film plate 27 not less than 0.5mm, total bus 23 is heatproof line
Cable.
In the present embodiment, described prime mover 13 is servo motor, and the material of the caisson 5 is PVC, the caisson 5
It is fixed by screws on the hull 3, the cross sectional shape of the water inlet pipe 21 and the outlet pipe 17 is consistent, the filter
The mesh number of net 22 is not less than 200, and the strainer 22 is fixed on the caisson 5 by grab.
In the present embodiment, the material of the mounting plate 19 is ABS engineering plastics, and 19 welding of mounting plate is in the waterproof
In case 5, the work refreshing frequency of the water quality sensor 20 is not less than 60HZ, and the working method of the ion transducer 18 is to connect
Touch.
In the present embodiment, the model PLC S7-200CN of the control host 24, the material of the display screen 25 is
IPS, the control keyboard 26 are embedded on the control host 24.
In the present embodiment, the control host 24 and the display screen 25, the solenoid valve 12, described prime mover 13, institute
State total bus 23, the battery 16, the water quality sensor 20, the ion transducer 18, the solar energy film plate 27
It is electrically connected with the control keyboard 26.
Concrete operating principle of the invention are as follows: the solar energy film plate 27 can absorb solar power generation, and by electric energy
Storage is stored into the battery 16 after being collected by total bus 23, and when needing use device, user will be described
Hull 3 is moved in water environment to be improved, and sends work order by the control keyboard 26, the control host 24 controls
Described prime mover 13, which is powered on, drives the hull 3 mobile, and in the process of moving, the water in water environment is through the water inlet pipe
21 are conveyed into the caisson 5, and are discharged at the outlet pipe 17, and user sends work by the control keyboard 26
Instruction, the water quality sensor 20 and the ion transducer 18 work and obtain the water quality information of water in the caisson 5 in real time
With ion concentration information and return to the control host 24, the control host 24 passes water quality information and ion concentration information
It is handed to real-time display on the display screen 25 and is observed for user and understood, user sentences according to water quality information and ion concentration information
It is disconnected to improve material required for water environment, and the end cap 10 is opened by the handle 9, in the shielded box 7 described in
The corresponding storage bin 15 is selected on supporter 14, will be contained with the taking-up of the storage bin 15 for improving water environment material and is beaten
It opens, and material is added into the feed hopper 1, while the control host 24 controls the solenoid valve 12 and opens, material is through institute
It states discharge nozzle 4 and is drained into water environment and carry out restoration of the ecosystem, while water quality information and ion concentration letter on the display screen 25
Real-time update is ceased, when reaching the desired value of recommendation, user stops charging, and controls the electricity by the control keyboard 26
Magnet valve 12 is closed, and just completes the restoration of the ecosystem of water environment in this way, easy to operate.
Embodiment two:
The present embodiment general contents are the same as example 1, institute's difference with, in the present embodiment, original described in the present embodiment
Motivation is one of diesel engine or petrol engine, and this mode drives the hull, be can avoid because of yin
The case where rainy day, solar energy was inadequate and cause the situation of the prime mover power deficiency, while can increase the hull in water ring
Cruising ability when being moved in border.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appending claims and equivalents circle
It is fixed.
Claims (10)
1. a kind of water environment ecological restoration device, it is characterised in that: including hull (3), support frame (2), shielded box (7) and control
Keyboard (26), hull (3) top surface are provided with support frame as described above (2), and feed hopper (1), institute are provided on support frame as described above (2)
It states feed hopper (1) bottom surface to be provided with conveying pipeline (11), conveying pipeline (11) bottom surface is provided with discharge nozzle (4), the discharge nozzle
(4) it is provided on solenoid valve (12), support frame as described above (2) side is provided with the shielded box (7), shielded box (7) top surface
It being provided with end cap (10), is provided with handle (9) on the end cap (10), shielded box (7) side is provided with radiator window (8),
Shielded box (7) inner bottom surface is provided with supporter (14), is provided with storage bin (15) on the supporter (14), described to set
Rack (14) side is provided with battery (16), and shielded box (7) side is provided with mounting rack (6), on the mounting rack (6)
It is provided with solar energy film plate (27), the mounting rack (6) is internally provided with total bus (23), hull (3) inner bottom surface
It is provided with prime mover (13), hull (3) bottom surface is provided with caisson (5), and caisson (5) side is provided with water inlet pipe
(21), caisson (5) another side is provided with outlet pipe (17), is set on the water inlet pipe (21) and the outlet pipe (17)
It is equipped with strainer (22), caisson (5) inside top surface is provided with mounting plate (19), is provided with water quality on the mounting plate (19)
Sensor (20), water quality sensor (20) side are provided with ion transducer (18), and shielded box (7) surface is provided with
It controls host (24), is provided with display screen (25) on the control host (24), display screen (25) side is provided with described
Control keyboard (26).
2. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: the material of support frame as described above (2)
Material is mild steel, and solid construction, the shape of the feed hopper (1) is funnel type, and the volume of the feed hopper (1) is not less than 5L,
The material of the conveying pipeline (11) is aluminium alloy, and wall thickness is not less than 3mm.
3. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: the material of the discharge nozzle (4)
Material is identical as the conveying pipeline (11), and the discharge nozzle (4) is connected through a screw thread with the conveying pipeline (11), the solenoid valve
(12) action response time is no more than 1s, and the solenoid valve (12) is fixed on the discharge nozzle (4) by screw element.
4. a kind of water environment ecological restoration device according to claim 3, it is characterised in that: the material of the shielded box (7)
Material is cold-rolled steel sheet, and the thickness of the shielded box (7) is not less than 5mm, and the end cap (10) and the shielded box (7) pass through pin shaft
Connection, the material of the handle (9) are quenched rubber, and the quantity of the radiator window (8) is not less than six.
5. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: the material of the supporter (14)
Material is quenched rubber, and the quantity of the storage bin (15) is not less than two, and the battery (16) is serial lithium battery group, described
The maximum output current of battery (16) is not higher than 30A.
6. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: the material of the mounting rack (6)
Material is mild steel, and the radiant power of hollow structure, the solar energy film plate (27) is not less than 40uw/cm2, the solar energy is thin
The thickness of diaphragm plate (27) is not less than 0.5mm, and total bus (23) is heatproof cable.
7. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: the prime mover (13) is to watch
Motor is taken, the material of the caisson (5) is PVC, and the caisson (5) is fixed by screws on the hull (3), described
Water inlet pipe (21) and the cross sectional shape of the outlet pipe (17) are consistent, and the mesh number of the strainer (22) is described not less than 200
Strainer (22) is fixed on the caisson (5) by grab.
8. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: the material of the mounting plate (19)
Material is ABS engineering plastics, and mounting plate (19) welding is in the caisson (5), the work of the water quality sensor (20)
Refreshing frequency is not less than 60HZ, and the working method of the ion transducer (18) is contact.
9. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: control host (24)
Model PLC S7-200CN, the material of the display screen (25) are IPS, and the control keyboard (26) is embedded in the control master
On machine (24).
10. a kind of water environment ecological restoration device according to claim 1, it is characterised in that: the control host (24)
With the display screen (25), the solenoid valve (12), described prime mover (13), total bus (23), the battery (16),
The water quality sensor (20), the ion transducer (18), the solar energy film plate (27) and the control keyboard (26)
Electrical connection.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201811253968.XA CN109052519A (en) | 2018-10-26 | 2018-10-26 | A kind of water environment ecological restoration device |
Applications Claiming Priority (1)
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CN201811253968.XA CN109052519A (en) | 2018-10-26 | 2018-10-26 | A kind of water environment ecological restoration device |
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ID=64764433
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CN201811253968.XA Pending CN109052519A (en) | 2018-10-26 | 2018-10-26 | A kind of water environment ecological restoration device |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101417844A (en) * | 2008-08-08 | 2009-04-29 | 常州浩瀚新材料科技有限公司 | A kind of mobile comprehensive water quality purifying treater |
CN106915419A (en) * | 2015-12-28 | 2017-07-04 | 杨励昌 | A kind of multi-functional water body repairs binary boat equipment |
CN107386228A (en) * | 2017-07-06 | 2017-11-24 | 浙江伍特环保科技有限公司 | A kind of river course comprehensive regulation ship |
CN207510668U (en) * | 2017-11-14 | 2018-06-19 | 华南理工大学 | A kind of solar energy unmanned boat of closed hull space long-distance remote control seawater sampling |
CN108226434A (en) * | 2018-01-24 | 2018-06-29 | 雷娜 | A kind of multi-functional multi-sensor equipment |
-
2018
- 2018-10-26 CN CN201811253968.XA patent/CN109052519A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101417844A (en) * | 2008-08-08 | 2009-04-29 | 常州浩瀚新材料科技有限公司 | A kind of mobile comprehensive water quality purifying treater |
CN106915419A (en) * | 2015-12-28 | 2017-07-04 | 杨励昌 | A kind of multi-functional water body repairs binary boat equipment |
CN107386228A (en) * | 2017-07-06 | 2017-11-24 | 浙江伍特环保科技有限公司 | A kind of river course comprehensive regulation ship |
CN207510668U (en) * | 2017-11-14 | 2018-06-19 | 华南理工大学 | A kind of solar energy unmanned boat of closed hull space long-distance remote control seawater sampling |
CN108226434A (en) * | 2018-01-24 | 2018-06-29 | 雷娜 | A kind of multi-functional multi-sensor equipment |
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Application publication date: 20181221 |