CN116616235A - Intelligent farming systems based on thing networking - Google Patents

Intelligent farming systems based on thing networking Download PDF

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Publication number
CN116616235A
CN116616235A CN202310658580.2A CN202310658580A CN116616235A CN 116616235 A CN116616235 A CN 116616235A CN 202310658580 A CN202310658580 A CN 202310658580A CN 116616235 A CN116616235 A CN 116616235A
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China
Prior art keywords
flexible
operation platform
module
disc
intelligent
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Granted
Application number
CN202310658580.2A
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Chinese (zh)
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CN116616235B (en
Inventor
李轶骥
阳圣莹
夏武奇
刘丽
黄芳芳
刘爱华
胡思雪
邓先平
朱润华
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Science And Technology Guarantee Center Of Sichuan Academy Of Agricultural Sciences
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Science And Technology Guarantee Center Of Sichuan Academy Of Agricultural Sciences
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Priority to CN202310658580.2A priority Critical patent/CN116616235B/en
Publication of CN116616235A publication Critical patent/CN116616235A/en
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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K61/00Culture of aquatic animals
    • A01K61/60Floating cultivation devices, e.g. rafts or floating fish-farms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • B08B7/026Using sound waves
    • B08B7/028Using ultrasounds
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81Aquaculture, e.g. of fish

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Zoology (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Farming Of Fish And Shellfish (AREA)

Abstract

The application relates to an intelligent cultivation system based on the Internet of things, which comprises a floating operation platform, a cultivation net bag arranged on the floating operation platform and used for forming a cultivation area below the floating operation platform, two underwater cleaning modules arranged on the floating operation platform and respectively positioned on the inner side and the outer side of the cultivation net bag, and a water flow fan and a flow rate sensor underwater cleaning module respectively arranged on the two underwater cleaning modules. According to the intelligent aquaculture system based on the Internet of things, disclosed by the application, the aquaculture net bags are cleaned in an automatic detection mode and a cleaning mode, and the whole cleaning process is automatically carried out, so that marine organism parasitism on the aquaculture net bags is removed.

Description

Intelligent farming systems based on thing networking
Technical Field
The application relates to the technical field of intelligent cultivation, in particular to an intelligent cultivation system based on the Internet of things.
Background
The "marine pasture" refers to a sea resource such as fish, shrimp, shellfish, algae, etc. which is purposefully and purposefully bred by gathering artificial-bred economic marine organisms by using natural marine ecological environment in a certain sea area and adopting large-scale fishery facilities and systematic management system, and is like grazing cattle and sheep on land.
In this kind of cultivation mode, the string bag of breed usefulness is soaked in the sea water for a long time, and marine organism parasitic phenomenon can appear on the surface, and this can lead to the water flow rate in the string bag to reduce, and oxygen and nutrient supply all can be influenced, still can increase the sick risk of living beings in the string bag, because in the slow water that flows, parasite's propagation and infection speed can also increase. Especially for large floating cultures, a serious outbreak of disease can lead to high losses.
Disclosure of Invention
The application provides an intelligent culture system based on the Internet of things, which is used for cleaning a culture net bag in an automatic detection mode and a cleaning mode, and the whole cleaning process is automatically carried out to remove marine organism parasitism on the culture net bag.
The above object of the present application is achieved by the following technical solutions:
the application provides an intelligent cultivation system based on the Internet of things, which comprises:
a floating operation platform;
the cultivation net bag is arranged on the floating operation platform and is used for forming a cultivation area below the floating operation platform;
the two underwater cleaning modules are arranged on the floating operation platform and are respectively positioned at the inner side and the outer side of the culture net bag; and
the water flow fan and the flow velocity sensor are respectively arranged on the two underwater cleaning modules;
wherein, wash the module under water and wash the string bag according to the feedback of flow sensor.
In one possible implementation of the present application, the underwater cleaning module includes:
a diving module;
the traction unit is arranged on the diving module, and the free end of a traction rope in the traction unit is fixed on a movable guide table positioned on the floating operation platform; and
the flexible cleaning disc and the counterweight disc are respectively arranged at two sides of the diving module.
In one possible implementation of the application, the flexible cleaning disc comprises:
the disc body is arranged on the diving module;
the flexible sealing ring is arranged at the edge of the tray body;
the electric flexible cutterhead is rotationally connected with the cutterhead body; and
the recovery bin is arranged on the disc body, and the input end of the recovery bin penetrates through the flexible sealing ring and then stretches into the position close to the electric flexible cutterhead.
In one possible implementation of the present application, the positioning sensor is further included on the tray body.
In one possible implementation of the application, the recycling bin comprises:
the first end of the pipeline can penetrate through the flexible sealing ring and then extend into a position close to the electric flexible cutterhead;
the base is arranged on the pipeline and is used for being connected with the tray body;
the pipeline fan is arranged in the pipeline; and
a flexible filter bag is disposed on the second end of the conduit.
In one possible implementation of the application, the disc is provided with an ultrasonic generator, which is located inside the flexible sealing ring.
In one possible implementation manner of the present application, the method further includes:
the detection channel is arranged on the diving module; and
the plurality of ranging sensors are uniformly distributed in the detection channel and are in data communication with the diving module, and the detection ends of the ranging sensors are pointed to the axis of the detection channel;
wherein, the haulage rope in the haulage unit passes the detection passageway.
In one possible implementation of the application, the plurality of distance measuring sensors are divided into two groups, the distance between the two groups of distance measuring sensors and the diving module being different.
In one possible implementation of the present application, a mobile station includes:
the annular guide rail is arranged on the floating operation platform; and
the movable trolley is arranged on the annular guide rail;
the free end of the traction rope in the traction unit is fixed on the mobile trolley.
Drawings
FIG. 1 is a schematic plan view of an intelligent cultivation system according to the present application.
Fig. 2 is a schematic diagram of the working principle of a water flow fan and a flow rate sensor provided by the application.
Fig. 3 is a schematic plan view of a part of a culture net bag according to the present application.
Fig. 4 is a schematic plan view of a part of the culture net bag provided by the application when the net bag is blocked.
Fig. 5 is a schematic structural diagram of an underwater cleaning module provided by the application.
Fig. 6 is a schematic structural view of a flexible cleaning disc provided by the application.
FIG. 7 is a schematic illustration of two flexible cleaning discs clamping a farming net bag according to the present application.
Fig. 8 is a schematic structural view of a recycling bin provided by the application.
Fig. 9 is a schematic position diagram of a positioning sensor according to the present application.
Fig. 10 is a schematic diagram of the working principle of a ranging sensor provided by the application.
Fig. 11 is a schematic diagram of a relative position of a traction rope and a detection channel when the traction rope is inclined.
Fig. 12 is a schematic diagram showing the relative positions of the hauling cable and the detection channel when the hauling cable is vertical.
Fig. 13 is a schematic structural diagram of a mobile guide table according to the present application.
In the figure, 1, a floating operation platform, 2, a culture net bag, 3, an underwater cleaning module, 5, a water flow fan, 6, a flow rate sensor, 8, a movable guide table, 31, a diving module, 32, a traction unit, 33, a flexible cleaning disc, 34, a counterweight disc, 71, a detection channel, 72, a distance measuring sensor, 81, an annular guide rail, 82, a movable trolley, 331, a disc body, 332, a flexible sealing ring, 333, an electric flexible cutter disc, 334, a recycling bin, 335, a positioning sensor, 336, an ultrasonic generator, 3341, a pipeline, 3342, a base, 3343, a pipeline fan, 3344 and a flexible filter bag.
Detailed Description
The technical scheme in the application is further described in detail below with reference to the accompanying drawings.
The application discloses an intelligent cultivation system based on the Internet of things, which mainly comprises a floating operation platform 1, a cultivation net bag 2, an underwater cleaning module 3, a water flow fan 5, a flow rate sensor 6 and the like, wherein the floating operation platform 1 floats on the water surface and provides an operation platform for workers and various cultivation equipment, the cultivation net bag 2 is arranged on the floating operation platform 1 and forms an independent cultivation area below the floating operation platform 1, and fish shoals move in the cultivation area.
Various devices on the floating operation platform 1, such as a feeder, an aerator, a sensor and the like, monitor the environmental parameters in the cultivation area, and simultaneously complete the operation contents of timing feeding, data acquisition, cultivation area environmental parameter adjustment and the like.
Referring to fig. 1, two underwater cleaning modules 3 are installed on the floating operation platform 1, the two underwater cleaning modules 3 are respectively located at the inner side and the outer side of the cultivation net bag 2, the underwater cleaning module 3 located at the inner side of the cultivation net bag 2 is used for cleaning the inner side of the cultivation net bag 2, and the underwater cleaning module 3 located at the outer side of the cultivation net bag 2 is used for cleaning the outer side of the cultivation net bag 2.
In the cleaning process, the two underwater cleaning modules 3 simultaneously clean the same area of the culture net bag 2, and the cleaning mode can reduce the cleaning range as far as possible, so that the influence of the cleaning process on the fish shoals is reduced; meanwhile, the cleaned garbage can be collected intensively, so that secondary pollution caused by entering the culture area is avoided.
Referring to fig. 2, arrows indicate water flow directions, two underwater cleaning modules 3 are respectively provided with a water flow fan 5 and a flow rate sensor 6, the water flow fan 5 is used for pushing water in front of the two underwater cleaning modules to accelerate flow, the flow rate sensor 6 is used for monitoring water flow speed in surrounding environment, and the water flow fan 5 and the flow rate sensor 6 are electrically connected with a controller in the underwater cleaning module 3.
Comparing fig. 3 and 4, it is evident that the water flow passing properties of the portion of the farming net bag 2 shown in fig. 4 are significantly opposite to the water flow passing properties of the portion of the farming net bag 2 shown in fig. 3.
In the preparation process before cleaning, the two underwater cleaning modules 3 are respectively moved to the same area on the inner side and the outer side of the culture net bag 2, then the two underwater cleaning modules 3 are moved towards each other and form a closed area at the culture net bag 2 in the area, so that the preparation stage before cleaning is completed.
Then, the two underwater cleaning modules 3 clean the culture net bags 2 in the closed area, after the cleaning is completed, the culture net bags 2 are moved to the next area, and after the trafficability (through water flow speed evaluation) of the culture net bags 2 in the area is tested, the next area is selected to be cleaned or moved.
Referring to fig. 5, the underwater cleaning module 3 is composed of a diving module 31, a traction unit 32, a flexible cleaning disc 33, a counterweight disc 34, etc., and the diving module 31 is used for moving underwater, including diving, floating, advancing, retreating, moving left and right, etc.
The traction unit 32 is installed on the diving module 31, and meanwhile, the free end of a traction rope in the traction unit 32 is fixed on the movable guide table 8 positioned on the floating operation platform 1, and the movable guide table 8 moves on the floating operation platform 1 to drive the traction unit 32 to move in the circumferential direction of the aquaculture net bag 2. The number of the movable guide tables 8 is two, and the two movable guide tables 8 are positioned on the bottom surface of the floating work platform 1, so that when the underwater cleaning module 3 needs to move in the horizontal direction, the two movable guide tables 8 act simultaneously.
At this point, the tractor unit 32 is responsible for submergence, levitation and fine position adjustment only.
The flexible cleaning disc 33 and the counterweight disc 34 are respectively arranged at two sides of the diving module 31, the flexible cleaning disc 33 is used for cleaning the culture net bag 2 positioned in the operation area, the counterweight disc 34 is used for adjusting the balance of the diving module 31 under water, and the diving module 31 is inclined due to the weight of one side of the diving module 31 after the flexible cleaning disc 33 is additionally arranged.
Referring to fig. 6, the flexible cleaning disc 33 is composed of a disc 331, a flexible sealing ring 332, an electric flexible cutter 333, a recycling bin 334, and the like, wherein the disc 331 is fixedly installed on the diving module 31, the flexible sealing ring 332 is installed at the edge of the disc 331, the electric flexible cutter 333 is rotationally connected with the disc 331, and a disc part of the electric flexible cutter 333 is located at the inner side of the flexible sealing ring 332.
In the cleaning process, the flexible sealing rings 332 on the two trays 331 apply pressure to the cultivation net bags 2 located in the coverage area of the flexible sealing rings 332 from the inner side and the outer side of the cultivation net bags 2, at this time, the flexible sealing rings 332 slightly deform, and the two flexible sealing rings 332 clamp the cultivation net bags 2 from two sides.
At this time, by means of the two flexible sealing rings 332, a sealed area can be formed on both sides of the culture net bag 2, and as shown in fig. 7, after the sealed area is formed, the two electric flexible cutterheads 333 are started simultaneously to clean the culture net bag 2 in the sealed area.
The recovery bin 334 is mounted on the disc 331, and an input end of the recovery bin 334 passes through the flexible sealing ring 332 and then extends to a position close to the electric flexible cutterhead 333. Thus, the waste generated during the cleaning process may enter the recovery bin 334.
Referring to fig. 8, the recovery bin 334 is composed of a pipe 3341, a base 3342, a pipe fan 3343 and a flexible filter bag 3344, wherein a first end of the pipe 3341 can penetrate through the flexible sealing ring 332 and then extend into the position close to the electric flexible cutterhead 333, and a second end of the pipe 3341 is connected with the flexible filter bag 3344 to communicate the sealed area with the flexible filter bag 3344.
A duct fan 3343 is also mounted in the duct 3341, the duct fan 3343 being controlled by a controller in the underwater cleaning module 3.
The action of the conduit fan 3343 drives the flow of liquid within the conduit 3341 toward the flexible filter bags 3344. After the liquid mixed with the garbage flows into the flexible filter bag 3344, the garbage is trapped by the flexible filter bag 3344, and the liquid flows out of the flexible filter bag 3344.
The conduit 3341 is secured to the disk 331 by a base 3342, which in some possible implementations is bolted to the disk 331.
Referring to fig. 9, in some examples, a positioning sensor 335 is added to the tray 331, where the positioning sensor 335 is used to enable the two trays 331 to be aligned quickly. The position sensor 335 is in data communication with a controller in the subsea cleaning module 3. In some possible implementations, the positioning sensor 335 uses a proximity sensor that senses a positioning member on the other disk 331 and informs the diving module 31 when the positioning member is in proximity to the proximity sensor.
In some possible implementations, two trays 331 are mounted with one positioning sensor 335 and one positioning member, and the two positioning sensors 335 of the two trays 331 have a distance difference in both the horizontal direction and the vertical direction, so as to ensure that the positioning sensor 335 can only detect the corresponding positioning member.
It should be appreciated that the underwater environment is relatively complex, and conventional modes such as light sensing and sound sensing may be affected by interference factors in water, but for the positioning sensor 335, a positioning member made of metal may be used as a sensing element, and when the positioning member made of metal approaches the positioning member to approach the positioning sensor 335, the positioning sensor 335 may accurately send a signal.
In some examples, referring to fig. 6, an ultrasonic generator 336 is additionally mounted on the tray 331, the ultrasonic generator 336 is located inside the flexible sealing ring 332, and the ultrasonic generator 336 is controlled by a controller in the underwater cleaning module 3, so that the liquid in the closed area mentioned in the foregoing can vibrate, and the culture net bag 2 located in the closed area is cleaned by means of water vibration.
It should be understood that during the submergence process, the position of the underwater cleaning module 3 may be affected by disturbance factors such as water flow, and in particular, the two underwater cleaning modules 3 need to be synchronized in position under water. By means of the positioning sensor 335 alone, it may occur that the positioning sensor 335 cannot detect the positioning member.
In order to solve the problem, the present application uses a detection channel 71 and a ranging sensor 72 to solve the problem, specifically, referring to fig. 5 and 10, the detection channel 71 is mounted on the diving module 31, and a plurality of ranging sensors 72 are mounted on the detection channel 71, and the ranging sensors 72 are uniformly distributed in the detection channel 71 and are in data communication with the diving module 31. The hauling cable in the hauling unit 32 passes through the detection channel 71, and the detection ends of the ranging sensors 72 are all directed to the axis of the detection channel 71. The distance measuring sensor 72 is in data communication with a controller in the subsea cleaning module 3.
Referring to fig. 11, the function of the ranging sensor 72 is to detect the hauling rope in the tractor unit 32, where the detection results in a distance, and when the distance values detected by the ranging sensors 72 are the same or the difference is within the allowable range, it is indicated that the hauling rope is in a vertical state, and the underwater cleaning module 3 can correct the position by means of the hauling rope. Comparing fig. 11 and 12, the filled circles in the drawings represent the pull-cord, and it is apparent that the pull-cord in fig. 12 is located at the center of the detection channel 71.
The specific process is that the underwater cleaning module 3 firstly uses the level meter to correct the self posture, then adjusts the position of the self on the horizontal plane according to the detection feedback of the plurality of ranging sensors 72, so that the traction rope in the traction unit 32 is in a vertical state, and finally realizes the butt joint with another underwater cleaning module 3 by means of the positioning sensor 335.
In some possible implementations, the plurality of ranging sensors 72 are divided into two groups, the two groups of ranging sensors 72 being at different distances from the diving module 31.
Referring to fig. 1 and 13, the movable guide 8 is composed of an endless rail 81 and a movable carriage 82, the endless rail 81 is mounted on the floating work platform 1, and the movable carriage 82 is mounted on the endless rail 81. When the annular guide rail 81 moves on the floating work platform 1, the two underwater cleaning modules 3 can be driven to move on the horizontal plane by the moving trolley 82. The mobile trolley 82 is controlled by a cloud or by a controller of the underwater cleaning module 3.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (9)

1. Intelligent farming systems based on thing networking, characterized by includes:
a floating work platform (1);
the cultivation net bag (2) is arranged on the floating operation platform (1) and is used for forming a cultivation area below the floating operation platform (1);
the two underwater cleaning modules (3) are arranged on the floating operation platform (1) and are respectively positioned at the inner side and the outer side of the culture net bag (2); and
the water flow fan (5) and the flow velocity sensor (6) are respectively arranged on the two underwater cleaning modules (3);
the underwater cleaning module (3) cleans the culture net bags (2) according to feedback of the flow rate sensor (6).
2. The intelligent aquaculture system based on the internet of things according to claim 1, wherein the underwater cleaning module (3) comprises:
a diving module (31);
the traction unit (32) is arranged on the diving module (31), and the free end of a traction rope in the traction unit (32) is fixed on the movable guide table (8) positioned on the floating operation platform (1); and
the flexible cleaning disc (33) and the counterweight disc (34) are respectively arranged at two sides of the diving module (31).
3. The intelligent farming system based on the internet of things according to claim 2, wherein the flexible washing disc (33) comprises:
the disc body (331) is arranged on the diving module (31);
a flexible sealing ring (332) arranged at the edge of the tray body (331);
an electric flexible cutterhead (333) which is connected with the tray body (331) in a rotating way; and
the recycling bin (334) is arranged on the disc body (331), and the input end of the recycling bin (334) penetrates through the flexible sealing ring (332) and then stretches into the position close to the electric flexible cutter disc (333).
4. An intelligent farming system according to claim 3, further comprising a positioning sensor (335) provided on the tray (331).
5. An intelligent farming system according to claim 3, wherein the recycling bin (334) comprises:
a pipe (3341) with a first end capable of penetrating through the flexible sealing ring (332) and then extending into the position close to the electric flexible cutterhead (333);
a base (3342) arranged on the pipeline (3341) and used for being connected with the tray body (331);
a duct fan (3343) provided in the duct (3341); and
a flexible filter bag (3344) is disposed on the second end of the conduit (3341).
6. An intelligent aquaculture system based on internet of things according to claim 3, characterized in that the disc (331) is provided with an ultrasonic generator (336), the ultrasonic generator (336) being located inside the flexible sealing ring (332).
7. The intelligent aquaculture system based on the Internet of things according to claim 2 to 6,
a detection channel (71) arranged on the diving module (31); and
the distance measuring sensors (72) are uniformly distributed in the detection channel (71) and are in data communication with the diving module (31), and the detection ends of the distance measuring sensors (72) are all pointed to the axis of the detection channel (71);
wherein, the haulage rope in the haulage unit (32) passes detection passageway (71).
8. The intelligent aquaculture system based on the internet of things of claim 7, wherein the plurality of ranging sensors (72) are divided into two groups, and the distances between the two groups of ranging sensors (72) and the diving module (31) are different.
9. The intelligent aquaculture system based on the internet of things of claim 2, wherein the mobile guide (8) comprises:
a ring-shaped guide rail (81) arranged on the floating operation platform (1); and
a travelling car (82) arranged on the annular guide rail (81);
the free end of the traction rope in the traction unit (32) is fixed on the mobile trolley (82).
CN202310658580.2A 2023-06-05 2023-06-05 Intelligent farming systems based on thing networking Active CN116616235B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310658580.2A CN116616235B (en) 2023-06-05 2023-06-05 Intelligent farming systems based on thing networking

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Application Number Priority Date Filing Date Title
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CN116616235B CN116616235B (en) 2024-03-12

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2882246Y (en) * 2005-09-03 2007-03-28 浙江海洋学院 Underwater dirt cleaner for net cage
JP2011125262A (en) * 2009-12-17 2011-06-30 Nagasaki Prefecture Device for cleaning underwater fishing net
CN104914903A (en) * 2015-06-19 2015-09-16 广西钦州保税港区欧博科技开发有限公司 Intelligent cage culture system and use method
CN106238371A (en) * 2016-10-21 2016-12-21 华南农业大学 A kind of territory, deep-sea aquaculture net cage automatic clearing apparatus
WO2018080315A1 (en) * 2016-10-28 2018-05-03 HAUKÅS, John Kristian Assembly for carrying out an operation on a net
CN216636798U (en) * 2022-01-09 2022-05-31 齐鲁工业大学 Underwater netting net cage cleaning robot

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2882246Y (en) * 2005-09-03 2007-03-28 浙江海洋学院 Underwater dirt cleaner for net cage
JP2011125262A (en) * 2009-12-17 2011-06-30 Nagasaki Prefecture Device for cleaning underwater fishing net
CN104914903A (en) * 2015-06-19 2015-09-16 广西钦州保税港区欧博科技开发有限公司 Intelligent cage culture system and use method
CN106238371A (en) * 2016-10-21 2016-12-21 华南农业大学 A kind of territory, deep-sea aquaculture net cage automatic clearing apparatus
WO2018080315A1 (en) * 2016-10-28 2018-05-03 HAUKÅS, John Kristian Assembly for carrying out an operation on a net
CN216636798U (en) * 2022-01-09 2022-05-31 齐鲁工业大学 Underwater netting net cage cleaning robot

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