CN107284610B - A kind of mechanization throwing seedling collecting method and equipment for marine suspended longline farming oyster - Google Patents
A kind of mechanization throwing seedling collecting method and equipment for marine suspended longline farming oyster Download PDFInfo
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- CN107284610B CN107284610B CN201710492912.9A CN201710492912A CN107284610B CN 107284610 B CN107284610 B CN 107284610B CN 201710492912 A CN201710492912 A CN 201710492912A CN 107284610 B CN107284610 B CN 107284610B
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- 241000237502 Ostreidae Species 0.000 title claims abstract description 53
- 235000020636 oyster Nutrition 0.000 title claims abstract description 53
- 238000009313 farming Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 15
- 238000009364 mariculture Methods 0.000 claims abstract description 7
- 239000000725 suspension Substances 0.000 claims abstract description 3
- 238000003306 harvesting Methods 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000013535 sea water Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012258 culturing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/50—Culture of aquatic animals of shellfish
- A01K61/54—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/08—Arrangement of ship-based loading or unloading equipment for cargo or passengers of winches
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (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 present invention relates to a kind of mechanizations for marine suspended longline farming oyster to throw seedling production recovery arrangement, and cultivation vavle shelf bottom is equipped with buoyancy tank, and buoyancy tank is equipped with steelframe, and steelframe end is equipped with connection stake, and cultivation vavle shelf is equipped with first pulley, and pulley is equipped with towing cable；Towing cable lower part has spaced rapid latch, and rapid latch is for mounting main push-towing rope, suspension setting branch cable on main push-towing rope, adheres to oyster or oyster carrier on branch cable；Truss, which is set to, to be loaded on ship, is loaded board and is equipped with the connection stake to match with cultivation vavle shelf, is fixed on topside for that will cultivate vavle shelf；The direction of main push-towing rope on truss is arranged along the direction perpendicular to crossbeam；It loads ship and is equipped with the power blocks that liftable is adjusted, there is second pulley corresponding with first pulley in power blocks.Labor problem and working strength needed for folding and unfolding during the present invention realizes oyster raw material rapid transport, solves the problems, such as oyster mariculture, only needing several workers to carry out less important work can be completed folding and unfolding and transhipment, improve efficiency.
Description
Technical field
The present invention relates to a kind of oyster cultures to throw seedling collecting method and equipment, specifically a kind of male for marine suspended longline farming
Seedling collecting method and equipment are thrown in the mechanization of oyster, belong to oyster culture technical field.
Background technique
Oyster is that the first big cultivated shellfish, China are oyster main production countries in the world, and cultured output accounts for world's oyster total output
82.0% or more.South Guangxi sea area is oyster culture vital area, and local main breeding way is the cultivation of raft frame, is cultivated
Throwing seedling in journey and harvesting can not do mechanization operation, fully rely on manual work, production efficiency is low, and worker at sea make by buoyant raft
Industry, working environment is dangerous and severe, and labor intensity is high, and the time is long, it has also become restricts the major technique of local oyster culture development
Bottleneck.
Summary of the invention
The object of the present invention is to provide the method and apparatus that a kind of oyster of mechanization throws seedling and harvesting, reduce oyster culture
Work intensity, improve oyster throw seedling and harvesting efficiency, improve oyster throw seedling harvesting operating environment and condition.
The present invention takes following technical scheme:
A kind of mechanization throwing seedling production recovery arrangement for marine suspended longline farming oyster, including load ship, modular cultivation
Vavle shelf, truss 9；The cultivation vavle shelf bottom is equipped with buoyancy tank 15, and buoyancy tank 15 is equipped with steelframe 16, and 16 end of steelframe is equipped with connection stake
1, crossbeam 5 that is several parallel and being rigidly linked together is fixed on steelframe, crossbeam 5 cultivates vavle shelf perpendicular to board is loaded
It is equipped with first pulley 14, pulley is equipped with towing cable 2；2 lower part of towing cable has spaced rapid latch 11, the fast lock
Button 11 is for mounting main push-towing rope 6, suspension setting branch cable 12 on main push-towing rope 6, adheres to oyster or oyster carrier on branch cable 12；The truss
9 are set on loading ship, load board and are equipped with the connection stake 1 to match with cultivation vavle shelf, are fixed on the side of a ship for that will cultivate vavle shelf
Side；The direction of main push-towing rope 6 on truss is arranged along the direction perpendicular to crossbeam 5；It is sliding to load the power that ship is adjusted equipped with liftable
Vehicle 10 has second pulley corresponding with first pulley 14 in power blocks.
Further, for assisting holding the cunning cable 4 of main push-towing rope, described sliding 4 one end of cable is solid for fixed setting below the main push-towing rope 6
It is scheduled on the cunning checking bollard 7 loaded on ship, sliding 7 liftable of checking bollard is adjusted.
Further, the lifting angle range of the power blocks 10 is 0~8 °.
Further, diesel engine hydraulic station 8, the diesel engine hydraulic station 8 and power blocks are additionally provided on the loading ship
10 connections.
Further, 9 bottom of truss has idler wheel, for extremely loading the transport of branch cable 12 for completing mounting in factory
On ship.
Further, aisle is equipped with around the modular cultivation vavle shelf.
Further, it is modular cultivation vavle shelf rule at chip setting across the sea, load ship successively to it is each support
Vavle shelf is grown to carry out throwing seedling or harvesting.
The throwing seedling collecting method of seedling production recovery arrangement is thrown in a kind of above-mentioned mechanization for marine suspended longline farming oyster:
When throwing seedling, comprising the following steps:
A) truss 9 is moved in workshop, and both ends are hung respectively with the main push-towing rope 6 of fake and are tied up at left and right sides of truss
It links in collar part, the branch cable 12 for adhering to oyster is successively then spaced to system and is hung on main push-towing rope 6；Complete a main push-towing rope is
It after extension, then is to hang next main push-towing rope, and continue 12 system of branch cable and hang operation；
B) truss 9 is transferred to and is loaded on ship, and is fixed；
C it) loads ship to navigate by water to mariculture area, adjusts hull position, make operation area side ship side and culture raft frame berthing, use cable
Rope consolidates both sides' connection 1 system of stake；
D pulley blocks) are respectively arranged in the reserved installation position in culture raft frame two sides, by towing cable 2 be installed on fixed pulley with
Power blocks capstan winch is simultaneously in place；
E when) throwing seedling operation starts, start hydraulic station, drive the rotation of power blocks capstan winch, two sides towing cable 2 is acted in capstan winch
Lower movement, the towing cable 2 above capstan winch are moved to raft frame side, and lower section is then opposite；At least configuration one respectively by 2 power blocks capstan winches
Name operative employee, while the main push-towing rope 6 for hanging with oyster being taken off from truss, is solid on towing cable 2, and with the movement of towing cable 2, according to
Secondary by main push-towing ropes all on truss is all to be fixed on towing cable 2；The solid main push-towing rope on towing cable of system with towing cable to conveying at raft frame, until the
One main push-towing rope reaches at the main push-towing rope pin of raft frame front end；Power blocks capstan winch position slowly drops to lowest order, so that towing cable is bowed
The elevation angle is transferred from solution on sliding checking bollard 4 to horizontal position by 8 ° to 0 °, while by the cunning cable 4 for loading shipboard, so that being solid on towing cable
Branch cable not in seawater；Operative employee positioned at raft frame two sides successively takes off main push-towing rope from towing cable, is respectively to be fixed in steel by main push-towing rope
On the main push-towing rope pin 3 of frame 16, complete to throw seedling；
When harvesting, successively main push-towing rope 6 is taken off to be hung on towing cable 2 from main push-towing rope pin 3 and is withdrawn.
Further, step D) in, 3 sliding cables are provided between towing cable, one is lain on raft frame with pin, and one lies in
It is in 8 ° of inclinations angle, for supporting the weight of main push-towing rope, preventing it in main push-towing rope transmission process on the cunning checking bollard of operation ship working region
Substantially hang from above.
The beneficial effects of the present invention are:
1) transhipment of oyster string is whole uses trussing, realizes integrated fast transportation；
2) it provides one kind and serially adds work, oyster land route and marine transhipment, oyster string in raft frame extension from land workshop oyster extension
Seedling to oyster is bred as, and the harvesting of oyster string is transported to the full-range novel oyster do mechanization operation mode such as land；Oyster can be achieved
Raw material rapid transport solves the problems, such as labor problem and working strength needed for folding and unfolding during oyster mariculture, only needs several
Name worker, which carries out less important work, can be completed folding and unfolding and transhipment, greatly improve efficiency；
3) oyster string on culture raft frame be hang operation realize unified standard, hang string between, between the density of main push-towing rope interval
Away from being fixed, solves Problem when manual work.
4) entirely the process of harvesting or throwing seedling is mainly completed on loading ship, and the labour for significantly reducing throwing seedling and harvesting is strong
Degree, improves work efficiency.
Detailed description of the invention
Fig. 1 is the top view that the present invention throws seedling production recovery arrangement for the mechanization of marine suspended longline farming oyster.
Fig. 2 is the main view that the present invention throws seedling production recovery arrangement for the mechanization of marine suspended longline farming oyster.
Fig. 3 is the left view that the present invention throws seedling production recovery arrangement for the mechanization of marine suspended longline farming oyster.
In figure, 1. connection stakes, 2. towing cables, 3. main push-towing rope pins, 4. sliding cables, 5. crossbeams, 6. main push-towing ropes, 7. sliding checking bollards, 8. diesel engines
Hydraulic station, 9. truss, 10. power blocks, 11. rapid latchs, 12. cables, 13. sliding cable pins, 14. first pulleys, 15. buoyancy tanks,
16. steelframe, 17. sliding checking bollards.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and specific examples.
Referring to Fig. 1-3, standard modular mariculture raft frame: single culture raft frame module centers culturing area is 6*6m,
Surrounding uses frame structure, and floating drum is installed in following four corners position, and top is laid with aisle, as service aisle.Between raft frame module
Can according to mariculture area situation carry out rigidity or flexible connection, word order several groups or 2 column raft frame modules it is arranged side by side after it is horizontally-arranged again
Several groups.
With continued reference to Fig. 1-3, several corresponding locks of raft frame culturing area or so inner sidewall installation, for being admittedly each item cultivation
Quick Connect Kit is arranged in main rope, raft frame front end aisle corresponding position, for installing fixed pulley assembly before throwing seedling and harvesting；Raft
Frame rear end is i.e. and to load the installation of ship berthing position be solid checking bollard, for it being to be solidly connected after operation ship berthing.
Referring to Fig. 1, load ship and be divided into 2 regions, loading area is arranged mobile trussing, trussing by truss 9, according to
It is secondary to arrange the connection collar part being mounted on truss or so overhanging arm and mobile mechanism's composition.Diesel is arranged in operation area
Hydraulic station 8, power blocks 10 are solid connection stake 1 and sliding checking bollard 17 etc..
When throwing seedling, comprising the following steps:
A) truss 9 is moved in workshop, and both ends are hung respectively with the main push-towing rope 6 of fake and are tied up at left and right sides of truss
It links in collar part, the branch cable 12 for adhering to oyster is successively then spaced to system and is hung on main push-towing rope 6；Complete a main push-towing rope is
It after extension, then is to hang next main push-towing rope, and continue 12 system of branch cable and hang operation；
B) truss 9 is transferred to and is loaded on ship, and is fixed；
C it) loads ship to navigate by water to mariculture area, adjusts hull position, make operation area side ship side and culture raft frame berthing, use cable
Rope consolidates both sides' connection 1 system of stake；
D pulley blocks) are respectively arranged in the reserved installation position in culture raft frame two sides, by towing cable 2 be installed on fixed pulley with
Power blocks capstan winch is simultaneously in place；3 sliding cables are provided between towing cable, one is lain on raft frame with pin, and one lies in operation ship
It is in 8 ° of inclinations angle, for supporting the weight of main push-towing rope, preventing it from substantially hanging down in main push-towing rope transmission process on the cunning checking bollard of working region
It hangs.
E when) throwing seedling operation starts, start hydraulic station, drive the rotation of power blocks capstan winch, two sides towing cable 2 is acted in capstan winch
Lower movement, the towing cable 2 above capstan winch are moved to raft frame side, and lower section is then opposite；At least configuration one respectively by 2 power blocks capstan winches
Name operative employee, while the main push-towing rope 6 for hanging with oyster being taken off from truss, is solid on towing cable 2, and with the movement of towing cable 2, according to
Secondary by main push-towing ropes all on truss is all to be fixed on towing cable 2；The solid main push-towing rope on towing cable of system with towing cable to conveying at raft frame, until the
One main push-towing rope reaches at the main push-towing rope pin of raft frame front end；Power blocks capstan winch position slowly drops to lowest order, so that towing cable is bowed
The elevation angle is transferred from solution on sliding checking bollard 4 to horizontal position by 8 ° to 0 °, while by the cunning cable 4 for loading shipboard, so that being solid on towing cable
Branch cable not in seawater；Operative employee positioned at raft frame two sides successively takes off main push-towing rope from towing cable, is respectively to be fixed in steel by main push-towing rope
On the main push-towing rope pin 3 of frame 16, complete to throw seedling；
When harvesting, successively main push-towing rope 6 is taken off to be hung on towing cable 2 from main push-towing rope pin 3 and is withdrawn.
It is the preferred embodiment of the present invention above, those of ordinary skill in the art can also carry out various changes on this basis
It changes or improves, under the premise of not departing from the present invention total design, these transformation or improve all should belong to that the present invention claims guarantors
Within the scope of shield.
Claims (9)
1. seedling production recovery arrangement is thrown in a kind of mechanization for marine suspended longline farming oyster, it is characterised in that:
Including loading ship, modular cultivation vavle shelf, truss (9)；
The cultivation vavle shelf bottom is equipped with buoyancy tank (15), and buoyancy tank (15) is equipped with steelframe (16), and steelframe (16) end is equipped with connection
Stake (1), is fixed with crossbeam (5) that is several parallel and being rigidly linked together on steelframe, crossbeam (5) perpendicular to loading board,
It cultivates vavle shelf and is equipped with first pulley (14), first pulley (14) is equipped with towing cable (2)；Towing cable (2) lower part has interval setting
Rapid latch (11), the rapid latch (11) is for mounting main push-towing rope (6), suspension setting branch cable (12), branch cable on main push-towing rope (6)
(12) adhere to oyster or oyster carrier on；
The truss (9) loads board and is equipped with the connection stake (1) to match with cultivation vavle shelf, being used for will set on loading on ship
Cultivation vavle shelf is fixed on topside；The direction of main push-towing rope (6) on truss is arranged along the direction perpendicular to crossbeam (5)；
It loads ship and is equipped with the power blocks (10) that liftable is adjusted, have corresponding with first pulley (14) the in power blocks
Two pulleys.
2. seedling production recovery arrangement is thrown in the mechanization as described in claim 1 for marine suspended longline farming oyster, it is characterised in that: institute
Stating fixed setting below main push-towing rope (6), for assisting holding the cunning cable (4) of main push-towing rope, described sliding cable (4) one end, which is fixed on, to be loaded on ship
Cunning checking bollard (7) on, sliding checking bollard (7) liftable is adjusted.
3. seedling production recovery arrangement is thrown in the mechanization as described in claim 1 for marine suspended longline farming oyster, it is characterised in that: institute
The lifting angle range for stating power blocks (10) is 0~8 °.
4. seedling production recovery arrangement is thrown in the mechanization as described in claim 1 for marine suspended longline farming oyster, it is characterised in that: institute
It states to load and be additionally provided with diesel engine hydraulic station (8) on ship, the diesel engine hydraulic station (8) connect with power blocks (10).
5. seedling production recovery arrangement is thrown in the mechanization as described in claim 1 for marine suspended longline farming oyster, it is characterised in that: institute
Truss (9) bottom is stated with idler wheel, for branch cable (12) transport for completing mounting in factory extremely to be loaded ship.
6. seedling production recovery arrangement is thrown in the mechanization as described in claim 1 for marine suspended longline farming oyster, it is characterised in that: institute
It states and is equipped with aisle around modular cultivation vavle shelf.
7. seedling production recovery arrangement is thrown in the mechanization as described in claim 1 for marine suspended longline farming oyster, it is characterised in that: mould
The cultivation vavle shelf rule of block at chip setting across the sea, load ship throwing successively carried out to each cultivation vavle shelf and seedling or adopt
It receives.
8. a kind of throwing seedling harvesting for throwing seedling production recovery arrangement for the mechanization of marine suspended longline farming oyster as claimed in claim 2
Method, it is characterised in that:
When throwing seedling, comprising the following steps:
A) truss (9) is moved in workshop, and both ends are hung respectively with the main push-towing rope (6) of fake and are tied up at left and right sides of truss
It links in collar part, the branch cable (12) for adhering to oyster is successively then spaced to system and is hung on main push-towing rope (6)；Complete a main push-towing rope
Be extension after, then be to hang next main push-towing rope, and continue branch cable (12) system and hang operation；
B) truss (9) is transferred to and is loaded on ship, and is fixed；
C it) loads ship to navigate by water to mariculture area, adjusts hull position, make operation area side ship side and culture raft frame berthing, it will with hawser
It is solid that both sides connect stake (1) system；
D first pulley, second pulley) are respectively arranged in the reserved installation position in culture raft frame two sides, towing cable (2) is installed on
First pulley and power blocks capstan winch are simultaneously in place；
E when) throwing seedling operation starts, start hydraulic station, drive the rotation of power blocks capstan winch, two sides towing cable (2) is under capstan winch effect
It moves, the towing cable (2) above capstan winch is moved to raft frame side, and lower section is then opposite；At least configuration one respectively by 2 power blocks capstan winches
Name operative employee, while the main push-towing rope (6) for hanging with oyster being taken off from truss, it is solid on towing cable (2), and with towing cable (2)
Main push-towing ropes all on truss are all successively to be fixed on towing cable (2) by movement；The solid main push-towing rope on towing cable of system is with towing cable to defeated at raft frame
It send, until first main push-towing rope reaches at the main push-towing rope pin of raft frame front end；Power blocks capstan winch position slowly drops to lowest order, makes
Towing cable pitch angle is obtained by 8 ° to 0 °, while solution decentralization makes to horizontal position from sliding checking bollard (4) by the cunning cable (4) for loading shipboard
Obtaining on towing cable is solid branch cable not in seawater；Operative employee positioned at raft frame two sides successively takes off main push-towing rope from towing cable, by main push-towing rope
Respectively it is to be fixed on the main push-towing rope pin (3) of steelframe (16), completes to throw seedling；
When harvesting, successively main push-towing rope (6) is taken off to be hung on towing cable (2) from main push-towing rope pin (3) and is withdrawn.
9. the throwing seedling harvesting side that seedling production recovery arrangement is thrown in the mechanization as claimed in claim 8 for marine suspended longline farming oyster
Method, it is characterised in that: step D) in, 3 sliding cables are provided between towing cable, one is lain on raft frame with pin, and one lies in work
It is in 8 ° of inclinations angle on the cunning checking bollard of industry ship working region, for supporting the weight of main push-towing rope in main push-towing rope transmission process, prevents it big
Width is hung from above.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710492912.9A CN107284610B (en) | 2017-06-26 | 2017-06-26 | A kind of mechanization throwing seedling collecting method and equipment for marine suspended longline farming oyster |
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|---|---|---|---|
| CN201710492912.9A CN107284610B (en) | 2017-06-26 | 2017-06-26 | A kind of mechanization throwing seedling collecting method and equipment for marine suspended longline farming oyster |
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| CN107284610B true CN107284610B (en) | 2019-02-19 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107581116A (en) * | 2017-10-26 | 2018-01-16 | 浦北县德海种养农产品加工专业合作社 | Utilize the method for the big oyster of suspended longline farming |
| CN108901956B (en) * | 2018-07-04 | 2020-03-10 | 中国水产科学研究院渔业机械仪器研究所 | Mechanical structure suitable for oyster raft frame type culture and laying and harvesting method |
| CN109526896A (en) * | 2018-12-21 | 2019-03-29 | 中国水产科学研究院渔业机械仪器研究所 | Oyster mechanized harvesting method and apparatus under the one horizontally disposed aquaculture model of seedling string |
| CN111937821B (en) * | 2020-08-25 | 2022-04-01 | 中国水产科学研究院渔业机械仪器研究所 | Transverse-rope cultivated oyster harvesting device and method |
| CN112262798A (en) * | 2020-11-10 | 2021-01-26 | 北部湾大学 | Balanced type oyster receiving and releasing mechanized operation platform |
| CN115777592B (en) * | 2022-12-06 | 2024-08-06 | 集美大学 | Guiding cutting device for oyster extension rope type flat hanging cultivation harvesting |
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| WO2017096424A1 (en) * | 2015-12-08 | 2017-06-15 | Boyle Norman | Oyster farming apparatus and methods |
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