CN110786280A - Stretching type bottom-sitting net cage - Google Patents
Stretching type bottom-sitting net cage Download PDFInfo
- Publication number
- CN110786280A CN110786280A CN201810870614.3A CN201810870614A CN110786280A CN 110786280 A CN110786280 A CN 110786280A CN 201810870614 A CN201810870614 A CN 201810870614A CN 110786280 A CN110786280 A CN 110786280A
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- frame
- net
- floating
- net cage
- tension
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Links
- 238000007667 floating Methods 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000010410 layer Substances 0.000 claims description 11
- 238000009395 breeding Methods 0.000 claims description 3
- 230000001488 breeding effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 239000007853 buffer solution Substances 0.000 abstract description 2
- 241000251468 Actinopterygii Species 0.000 description 6
- 238000009360 aquaculture Methods 0.000 description 6
- 244000144974 aquaculture Species 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 3
- 239000004700 high-density polyethylene Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 208000034699 Vitreous floaters Diseases 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/60—Floating cultivation devices, e.g. rafts or floating fish-farms
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/80—Feeding devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Abstract
The invention provides a tension type bottom-sitting net cage suitable for bottom water body cultivation. The net cage is characterized in that a basic frame positioned at the bottom of the net cage is connected with a tension floating frame at the upper part of the net cage through a flexible tension cable and a net body, so that the flexible net cage with an integral buffer system is formed, the capacity retention rate of the net cage is improved while the net cage has strong wind and wave resistance, and the net cage meets the requirements of ship leaning and cultivation operation.
Description
Technical Field
The invention relates to a net cage device for underwater culture, in particular to a stretching bottom-sitting net cage.
Background
The development of the marine ranch is free from deep sea cage culture equipment, which relates to engineering problems in various aspects of wave resistance of the cages, bait feeding, net cleaning, monitoring, operation convenience and the like. In deep sea areas, the waves are generally large. Especially, the east sea and the south sea of China are in a typhoon-prone area, and the influence of wind waves on the net cage culture system is especially obvious. The development of deep sea net cages is the leading edge of the world where Norway, America and Japan are walked.
The main forms of the Norwegian net cages are cylindrical net cages made of HDPE materials and sinkable tension leg type net cages. The cylindrical net cage has the advantages of low cost, simple structure and convenient operation, and has the defects of high volume loss, limited operation platform area, requirement of supporting working ships and equipment and difficult operation in severe weather; the tension leg type net cage has the advantages that the structure of the cage body is simple, the wind wave resistance is strong, the cage can be operated in open sea areas, the occupied area of the anchoring system is small, and when wind waves are large, the net cage can automatically sink, and the tension leg type net cage has the defects of high cost, no operating platform, difficult operation, complex installation of the anchoring system, and the need of matching a working ship and an underwater automatic bait casting system.
The main forms of the American net cages are butterfly-shaped net cages and spherical net cages. The butterfly net cage has the advantages of good integrity, high volume retention rate, strong wind and wave resistance, simple anchoring, convenient dragging and moving of the net cage, high cost, incapability of effectively feeding baits due to limited area and more matched equipment required during operation; the spherical net cage has the advantages that the netting is not easy to deform, the volume retention rate is high, the aluminum pipe frame structure is light and convenient, the strength is high, the shape is spherical, the volume is large, the material consumption is saved, the net cage can rotate and can realize self-flushing, and the spherical net cage has the defects of high cost, complex frame structure, anticorrosion treatment and maintenance and accurate operation of skilled workers.
The main form of the Japanese net cage is a floating rope type net cage. The floating rope type net cage is composed of a rope, a box body, a floater, an iron anchor and the like, is a flexible structure, can fluctuate along with the fluctuation of wind waves, is a box body with six closed sides, and is not easy to be submerged by the wind waves to enable fishes to escape. The net cage has the advantages of low cost, simple square box structure, easy manufacture, adjustable structure according to sea conditions, and weak flow resistance of the flexible rope frame, high volume loss rate, no operating platform, and needing to be matched with a working ship during operation.
Deep sea aquaculture is an important industry of fishery all over the world, compared with the world aquaculture, the production mode of aquaculture in China is extensive and is influenced by the deterioration of the external water area environment and the deterioration of the internal water quality, the aquaculture space on inland and coastal near shore is extruded, and the safety problem of aquaculture products is increasingly prominent, so that the deep sea aquaculture is a necessary way for promoting the development of fishery industry in China. The current deepwater net cage in China has the biggest defects of poor wave resistance and flow resistance, unsuitability for fish culture in the water flow environment in the net cage, and lack of matched technology and facility equipment.
The patent application just provides a bottom box with a stretching type suitable for bottom water body is bred under this background.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provide the stretching type bottom-sitting net cage suitable for bottom water body culture. The net cage is characterized in that a basic frame positioned at the bottom of the net cage is connected with a tension floating frame at the upper part of the net cage through a flexible tension cable and a net body, so that the flexible net cage with an integral buffer system is formed, the capacity retention rate of the net cage is improved while the net cage has strong wind and wave resistance, and the net cage meets the requirements of ship leaning and cultivation operation.
The invention is realized by the following technical scheme:
the tension type bottom-sitting net cage comprises a slide-resistant pile foundation, a foundation frame, a tension floating frame, a tension cable system, a feeding floating frame and a net body system,
the anti-slip pile foundation consists of a cylindrical foundation and a limiting structure, and the cylindrical foundation is arranged at the bottom of the foundation frame through the limiting structure;
the bottom of the basic frame is provided with a floating pipe, four corners of the floating pipe are respectively provided with four groups of inclined struts to form a bottom surface, and the bottom surface, the frame upright posts and the top structural pipe form the basic frame; the limiting structures are arranged between the four corners of the floating pipe and the inclined struts;
the tension floating frame consists of a bottom floating ring, a floating frame upright post and a top structural pipe;
the tension cable system is a tension cable connecting piece for connecting the base frame and the tension floating frame;
the feeding floating frame is of a floating frame structure consisting of two layers of pipes, is arranged in the net cage and floats on the water surface;
the net body system is composed of a plurality of pieces of netting and is in a net pool shape; each side of basic frame all is provided with the dictyosome, each side of tensile floating frame all is provided with the dictyosome, basic frame with the tensile is provided with the dictyosome between floating the frame, be provided with the top net on the pipe of tensile floating frame upper portion, the top net with the frame upper portion union coupling is floated in throwing something and feeding, and each dictyosome junction is provided with prevents escaping the net.
The upper part of the top structural pipe of the tension floating frame is provided with a walkway, a ladder, a railing and a warning lamp for the use of breeding operation.
The net body can adopt a single-layer net or a multi-layer net.
The invention has the beneficial effects that:
the high volume retention rate of the net cage is realized through the tensile design of the net cage, and the requirement of fish on dissolved oxygen is met;
through the design of a net cage in a bottom-sitting mode, a double-layer net body can be arranged at a position close to a mud surface, and the outer net body uses a flow-blocking dense net, so that the flow reduction can be effectively realized, thereby providing living space for fishes under severe sea conditions, reducing the influence of the severe sea conditions on the fishes and the net cage, and being suitable for the culture of the fishes with smaller requirements on water particle motion; meanwhile, the bottom-sitting design realizes the cultivation by utilizing the bottom water body, and is particularly suitable for the cultivation of cold water sea resources such as cold water clusters and the like;
the upper part of the net cage adopts a tension floating frame with a certain height, so that the requirements of different water levels are met, the berthing of a culture ship is facilitated, and a culture operation window is enlarged; meanwhile, the tension floating frame can be provided with a double-layer net body, and the outer net body is used for blocking floating objects, so that common damage to the net body near the water surface is effectively reduced, and the service life of the net body is prolonged;
tension cables are adopted between the upper part structure and the lower part structure of the net cage to transfer force, so that the stress of the net cage is effectively reduced, and the damage rate of a net body is effectively reduced;
the floating frame is arranged in the net cage, the feeding pipe can be connected to the lower ring of the floating frame, so that automatic feeding is realized, meanwhile, the upper ring of the floating frame supports the top net, the top net is less in water entering, and meanwhile, the bird prevention effect is realized;
the net cage can sit at the bottom for culture operation, and the equipment or the net cage facilities can float out of the water surface for operation when needing maintenance. The netting is convenient to replace and maintain, the operation surface is designed above the water surface, and the cost increased by underwater operation is saved;
the cylindrical foundation is adopted as the anti-slip pile, so that the installation is convenient, the self-installation can be realized, and the disassembly and the movement are convenient.
The invention is further illustrated with reference to the following figures and examples.
Drawings
FIG. 1 is an elevational view of the cage;
FIG. 2 is a cross-sectional view of the net cage (net body system);
FIG. 3 is a top view of the net cage;
FIG. 4 is a top view of a square floating pipe structure of a basic frame of the net cage;
fig. 5 is a schematic diagram of towing transportation (or floating maintenance) of the net cage.
Detailed Description
The present invention is described in detail below with reference to the accompanying fig. 1-5.
The net cage system of the invention consists of a slide-resistant pile foundation 1, a foundation frame 2, a tension floating frame 3, a tension cable system 4, a feeding floating frame 5 and a net body system 6.
The anti-slip foundation 1 is a group of cylindrical foundations 1-1, and the cylindrical foundation is used as an anti-slip system of the net cage, so that the anti-slip foundation has the advantages of high reliability, convenience in installation and removal and capability of realizing reuse of the net cage. The cylindrical foundation 1-1 is installed at the bottom of the foundation frame 2 through the limiting structure 1-2, and the cylindrical foundation 1-1 and the limiting structure 1-2 can be arranged at each end corner of the foundation frame 2.
The base frame 2 is a frame structure which takes structural steel as a main material and can independently bear the load, the frame structure can be in the form of an octagonal prism, a cylinder or other polygonal section prism structures, and the embodiment takes the octagonal prism as an example for illustration;
the bottom of the frame structure is composed of floating pipes 2-1 which are enclosed into a square shape, and the floating pipes 2-1 can submerge and float the net cage through water injection and drainage; water is not injected into the floating pipe 2-1 during towing transportation, so that buoyancy can be provided for the whole net cage facility; after the transportation is in place, the floating pipe 2-1 is filled with water to realize submergence, and finally the installation is finished by penetrating the anti-slip foundation 1. The floating pipes 2-1 can be drained as required in the later operation and maintenance process of the net cage, so that the net cage integrally floats out of the water surface to be convenient for maintaining and repairing the net body system 6 and related equipment. Four inclined struts 2-2 are respectively arranged at four corners of the floating tube 2-1, so that a bottom surface is formed, and the bottom surface, the frame upright posts 2-3 and the top structural tubes 2-4 form a basic frame 2. Limiting structures 1-2 are arranged between the four corners of the floating pipe 2-1 and the inclined struts.
The tension floating frame 3 is a frame structure which takes structural steel as a main material and can independently bear the load, the frame structure can be in the form of an octagonal prism, a cylinder or other polygonal section prismatic structures, and the embodiment takes the octagonal prism as an example for explanation;
the tension floating frame 3 consists of a bottom floating ring 3-1, a floating frame upright post 3-2 and a top structural pipe 3-3. The bottom of the tension floating frame 3 is provided with a bottom floating ring 3-1 with larger buoyancy, and the upper structure of the net cage and the basic frame are tensioned by the buoyancy of the bottom floating ring 3-1, so that the capacity retention rate of the net cage is increased to the maximum extent. The height of the floating frame upright post 3-2 is set to meet the requirement of tidal range, and the upper culture operation platform under different water levels can be guaranteed to float out of the water surface so as to meet the requirement of culture operation. The upper part of the top structure pipe is also provided with accessories 3-4 such as walkways, ladders, railings, warning lamps and the like for the breeding operation.
And the tension cable system 4 is a tension cable connecting piece for connecting the base frame 2 and the tension floating frame 3.
The feeding floating frame 5 is a floating frame structure consisting of two layers of pipes, is arranged inside the net cage and floats on the water surface, and the pipeline can be an HDPE (high-density polyethylene) pipe or a steel pipe. The lower pipe of the feeding floating frame 5 is used as a feeding pipe, and the upper pipe is connected with the top net 6-7, so that the top net 6-7 is less in water, and the feeding floating frame 5 can be limited.
The net system 6 is a net system consisting of a plurality of pieces of netting and is in a net pool shape. Each side surface of the basic frame 2 can be provided with a double-layer net body, the inner net body 6-1 of the double-layer net body can adopt a PET net with stronger marine organism resistance, the outer net body 6-2 can adopt a dense net with higher water blocking rate to play a role in baffling, and a bottom-sealing anti-escape bottom net 6-3 is arranged between the bottom of the inner net body 6-1 and a mud surface. An octagonal prism net body 6-4 is arranged between the base frame 2 and the tension floating frame 3, and the octagonal prism net body 6-4 is also made of a PET net with strong marine organism resistance. And a tension cable system 4 is arranged outside the octagonal prism net body 6-4. Each side surface of the tension floating frame 3 can be provided with a double-layer net body, the inner net body 6-5 of the double-layer net body can adopt a PET net with stronger marine organism resistance, and the outer net body 6-6 can adopt a flexible net capable of blocking floaters. The top nets 6-7 are arranged on the upper pipe of the tension floating frame 3, and the top nets 6-7 are simultaneously connected with the upper pipe of the feeding floating frame 5, so that the top nets 6-7 are less in water. The net body leakage prevention is carried out by using escape-proof nets 6-8 at the joints of the net bodies.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (3)
1. Stretch-draw formula bottom of sitting box with a net, including smooth pile foundation, basic frame, tension floating frame, tension cable system, throw and feed floating frame and dictyosome system, its characterized in that:
the anti-slip pile foundation consists of a cylindrical foundation and a limiting structure, and the cylindrical foundation is arranged at the bottom of the foundation frame through the limiting structure;
the bottom of the basic frame is provided with a floating pipe, four corners of the floating pipe are respectively provided with four groups of inclined struts to form a bottom surface, and the bottom surface, the frame upright posts and the top structural pipe form the basic frame; the limiting structures are arranged between the four corners of the floating pipe and the inclined struts;
the tension floating frame consists of a bottom floating ring, a floating frame upright post and a top structural pipe;
the tension cable system is a tension cable connecting piece for connecting the base frame and the tension floating frame;
the feeding floating frame is of a floating frame structure consisting of two layers of pipes, is arranged in the net cage and floats on the water surface;
the net body system is composed of a plurality of pieces of netting and is in a net pool shape; each side of basic frame all is provided with the dictyosome, each side of tensile floating frame all is provided with the dictyosome, basic frame with the tensile is provided with the dictyosome between floating the frame, be provided with the top net on the pipe of tensile floating frame upper portion, the top net with the frame upper portion union coupling is floated in throwing something and feeding, and each dictyosome junction is provided with prevents escaping the net.
2. The tension type submersible net cage according to claim 1, characterized in that walkways, ladders, railings, warning lights for breeding operation are arranged on the upper portion of the top structural pipe of the tension floating frame.
3. The tension type submersible net cage according to claim 1, characterized in that the net body can be a single layer net or a multi-layer net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870614.3A CN110786280A (en) | 2018-08-02 | 2018-08-02 | Stretching type bottom-sitting net cage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870614.3A CN110786280A (en) | 2018-08-02 | 2018-08-02 | Stretching type bottom-sitting net cage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110786280A true CN110786280A (en) | 2020-02-14 |
Family
ID=69425915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810870614.3A Pending CN110786280A (en) | 2018-08-02 | 2018-08-02 | Stretching type bottom-sitting net cage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110786280A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718005A (en) * | 2022-03-15 | 2022-07-08 | 长江勘测规划设计研究有限责任公司 | Fish blocking floating gate suitable for large diversion canal |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5967086A (en) * | 1997-11-06 | 1999-10-19 | Knott, Sr.; James M. | Aquaculture method and apparatus |
| EP1525790A2 (en) * | 2003-10-21 | 2005-04-27 | Juan Ignacio Rodriguez Vazquez | Floating round shaped compounds of fish cages |
| WO2013095021A1 (en) * | 2011-12-21 | 2013-06-27 | National Fisheries Research And Development Institute | Integrated multi-trophic aquaculture system with tourism purpose |
| CN204599011U (en) * | 2015-04-21 | 2015-09-02 | 古国维 | The tension leg wind wave resistance net cage of free suspending weight additional buoyancy block dual system mooring |
| CN206314416U (en) * | 2016-11-15 | 2017-07-11 | 天津市海王星海上工程技术股份有限公司 | A kind of vertical seat bottom fence is combated typhoon net cage |
| US20180139935A1 (en) * | 2016-11-23 | 2018-05-24 | Graduate School At Shenzhen, Tsinghua University | Steel structure cage for marine crustacean aquaculture and integration thereof into vertical fish-crustacean aquaculture system |
| CN208863387U (en) * | 2018-08-02 | 2019-05-17 | 浙江舟山海王星蓝海开发有限公司 | Stretching type sits spacer screen case |
-
2018
- 2018-08-02 CN CN201810870614.3A patent/CN110786280A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5967086A (en) * | 1997-11-06 | 1999-10-19 | Knott, Sr.; James M. | Aquaculture method and apparatus |
| EP1525790A2 (en) * | 2003-10-21 | 2005-04-27 | Juan Ignacio Rodriguez Vazquez | Floating round shaped compounds of fish cages |
| WO2013095021A1 (en) * | 2011-12-21 | 2013-06-27 | National Fisheries Research And Development Institute | Integrated multi-trophic aquaculture system with tourism purpose |
| CN204599011U (en) * | 2015-04-21 | 2015-09-02 | 古国维 | The tension leg wind wave resistance net cage of free suspending weight additional buoyancy block dual system mooring |
| CN206314416U (en) * | 2016-11-15 | 2017-07-11 | 天津市海王星海上工程技术股份有限公司 | A kind of vertical seat bottom fence is combated typhoon net cage |
| US20180139935A1 (en) * | 2016-11-23 | 2018-05-24 | Graduate School At Shenzhen, Tsinghua University | Steel structure cage for marine crustacean aquaculture and integration thereof into vertical fish-crustacean aquaculture system |
| CN208863387U (en) * | 2018-08-02 | 2019-05-17 | 浙江舟山海王星蓝海开发有限公司 | Stretching type sits spacer screen case |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718005A (en) * | 2022-03-15 | 2022-07-08 | 长江勘测规划设计研究有限责任公司 | Fish blocking floating gate suitable for large diversion canal |
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Application publication date: 20200214 |
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