Self-cleaning modular gravity net cage culture system

Abstract

The present application relates to a self-cleaning modular gravity net cage culture system, comprising: a floating assembly comprising a plurality of floating units arranged in a rectangular array; a cage assembly comprising a frame and a float, each frame being arranged on two adjacent floating units, the two ends of the frame being connected to the two ends of the two adjacent floating units, and a plurality of floats being fixedly arranged below the frame; a plurality of oyster cages being hung on the frame for oyster culture; and a cleaning assembly comprising a mounting frame and a cleaning mechanism, the mounting frame being connected to the floating assembly, the mounting frame being capable of swinging relative to the floating assembly, a plurality of the cleaning mechanisms being arranged at intervals along the mounting frame, each cleaning mechanism being capable of contacting at least two adjacent oyster cages, and / or each oyster cage being capable of contacting at least one cleaning mechanism. Compared with the prior art, the cleaning assembly of the present application can clean the oyster cages under the action of water flow and wind waves, thereby extending the time interval for cleaning the oyster cages on water to 3-6 months.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine culture equipment, in particular to a self-cleaning modular gravity type net cage culture system. BACKGROUND

[0002] Oysters, also commonly known as oysters, are the world's largest farmed shellfish, one of the important marine biological resources available to humans, and a globally distributed species. Oysters are delicious and nutritious, have unique health benefits and medicinal value, and are a highly nutritious marine delicacy. They are an important object of marine aquaculture worldwide and the largest economic shellfish in China and the world.

[0003] China's oyster production ranks first in the world, accounting for more than 83% of the world's oyster production. Currently, the main method of offshore oyster culture is floating (raft) suspension culture, which uses PE floating balls, inflatable floating balls, or foam floating balls as floats and builds floating rafts with bamboo and wood to suspend oysters in oyster cages. Oyster cages are placed in seawater for a long time, and water flowing through the culture area carries silt and other particulate matter as well as attached organisms such as mussels and mussels. These particulate matter and attached organisms are prone to sedimentation or attachment on the oyster cage, blocking the mesh of the oyster cage, affecting the exchange of water inside and outside the oyster cage, and thus affecting the oysters' filtering of nutrients such as microalgae and plankton. It also leads to poor water environmental conditions in the oyster cage, insufficient dissolved oxygen supply, and affects the growth of oysters. In addition, attached organisms will compete with oysters for nutrients in the water, extending the oysters' growth cycle, and more seriously, some attached organisms will drill into the oyster shell or penetrate the oyster shell, increasing the frequency of oyster disease and reducing the survival rate of oysters. In addition, in recent years, due to the serious impact of human activities on nearshore estuarine areas, heavy metal pollution and harmful algal blooms have occurred frequently. In order to pursue high-quality oysters, oyster culture has gradually moved to the deep sea, where the wind and waves are stronger. In addition to the direct damage of easily causing floating raft collapse and oyster fry loss, it also leads to an increase in silt content in the water, exacerbating the phenomenon of silt attachment on the oyster cage.

[0004] In order to promote the growth of oysters, the silt and attached organisms on the oyster cage need to be cleaned in time, but the current oyster cage cleaning method is primitive, usually every 1-2 months, the oyster cage needs to be taken out of the water surface one by one, and the oyster cage is sprayed in multiple directions by using high-pressure water flow to remove the silt and attached organisms deposited on the oyster cage, and the oyster cage needs to be put back on the floating row for further cultivation after cleaning. The cleaning process takes time, and the grower needs to work on the floating row for a long time, increasing labor costs. And during the whole deep-sea oyster cultivation period, the oyster cage needs to be cleaned many times, the repeated operation of the ship increases the labor cost, and also consumes a large amount of diesel oil, the emission of diesel oil combustion products pollutes the sea area and affects the quality of oysters. In addition, the oyster cage is usually fixed at the top end during cleaning, therefore, when the high-pressure water flow sprays the oyster cage, the bottom end of the oyster cage is easy to swing, which affects the cleaning efficiency and increases the cost, and the swing of the bottom end of the oyster cage also causes the oysters to collide with each other, thereby causing partial damage to the oysters. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings and deficiencies of the prior art, and to provide a self-cleaning modular gravity type net cage culture system.

[0006] The present application is realized by the following technical scheme: a self-cleaning modular gravity type net cage culture system, comprising:

[0007] The floating row assembly comprises a truss and a connecting pipe, a plurality of connecting pipes are connected to the inside of the truss, and a plurality of rectangular array arranged floating row units are formed by enclosing the connecting pipe and the truss and / or the plurality of connecting pipes;

[0008] The cage frame assembly comprises a frame and a float, each frame is arranged on two adjacent floating row units, the two ends of the frame are connected with the two ends of the two adjacent floating row units, and a plurality of floats are fixedly arranged below the frame;

[0009] A plurality of oyster cages are hung on the frame for oyster cultivation;

[0010] The cleaning assembly comprises a mounting frame and a cleaning mechanism, the mounting frame is connected with the floating row assembly, the mounting frame can swing relative to the floating row assembly, a plurality of cleaning mechanisms are arranged at intervals along the mounting frame, each cleaning mechanism can contact at least two adjacent oyster cages, and / or each oyster cage contacts at least one cleaning mechanism.

[0011] Compared with the prior art, the present application sets a cleaning assembly between adjacent oyster cages, under the action of water flow and wind waves, the cleaning assembly swings and / or rotates, collides or rubs with the oyster cage, causing the deposited silt on the oyster cage to be shaken off or wiped off, i.e. the organisms attached or just attached to the oyster cage are shaken off or wiped off in the early stage of attachment, thereby promoting the full exchange of water in the oyster cage with the external water, so that the water in the oyster cage has sufficient nutrients and oxygen for the growth of oysters, thereby extending the time interval for cleaning the oyster cage on water to 3-6 months.

[0012] Further, the mounting frame comprises a hanging rope and a mounting rod, the hanging rope connects the two ends of the mounting rod to the truss and / or the connecting pipe, the mounting rod is substantially parallel to the length direction or the width direction of the truss; the cleaning mechanism comprises a cleaning frame and a brush part, a plurality of cleaning frames are arranged at intervals along the length direction of the mounting rod, the cleaning frame is connected to the mounting rod, the brush part is connected to the cleaning frame, substantially parallel to the oyster cage, and the length of the brush part is equal to or close to the length of the oyster cage; the mounting rod and / or the brush part are rotationally connected to the cleaning frame. Through this setting, the water flow and wind waves can drive the brush part to rotate, so that the brush part can clean multiple oyster cages, while reducing the water flow blocking area of the brush part.

[0013] Further, each cleaning frame is arranged between two to four adjacent oyster cages, the distance between the two to four adjacent oyster cages is substantially equal, and each oyster cage is adjacent to only one cleaning frame; the end of the brush part away from the cleaning frame is in contact with the oyster cage, and is provided in a zigzag shape, a wave shape, or a plurality of silica gel bristles are arranged at the end of the brush part in contact with the oyster cage. Through this setting, the total number of cleaning assemblies, especially the cleaning mechanism, is reduced, the resistance of the cleaning assembly, especially the cleaning mechanism, to the water flow and the adsorption of plankton are reduced, the water flow in the area where the entire net cage culture system is located is promoted, and costs can be saved.

[0014] Further, the brush part comprises a plurality of brush heads, the plurality of brush heads are arranged along the length direction of the cleaning frame and are fixedly connected to the cleaning frame, and the projections of the plurality of brush heads on the horizontal plane at least partially do not overlap. Through this setting, the water flow in the same direction has a larger area when it contacts the cleaning frame at different rotation angles, which is sufficient to drive the cleaning frame to rotate by a larger angle or for a longer time, thereby promoting the full contact of the brush head with the oyster cage, and at the same time, avoiding the lower brush head from hindering the attachment and sediment cleaned above, causing it to be deposited on the oyster cage again.

[0015] Further, the included angle between the projections of any two brush heads in the brush part on the horizontal plane is less than 180°. Through this setting, the blocking area of a single brush part to the water flow is reduced, the water flow is unobstructed, and at the same time, the unobstructed water flow will drive the brush part to rotate at a suitable speed, which reduces the damage to the oyster cage while cleaning the oyster cage.

[0016] Furthermore, the main body of the brush is made of silicone, PTFE, or graphene, or the surface of the main body of the brush is coated with a fluoropolymer coating, a nano-coating, a polydimethylsilane coating, or PTFE. This design reduces the adsorption of algae and other plankton by the brush, thereby minimizing the impact of the cleaning assembly on oyster growth and extending the service life of the cleaning assembly.

[0017] Furthermore, the cleaning assembly includes a lifting mechanism fixed to the truss. The lifting mechanism includes a winding section. One end of the hoisting rope of the cleaning assembly is fixed to the winding section, and the other end is fixed to the end of the truss away from the lifting mechanism. The winding section controls the depth of the cleaning mechanism by winding or releasing the hoisting rope, so that the cleaning mechanism overlaps or is offset from the plane where the oyster cage is located. This design allows the mounting frame and cleaning mechanism to descend and offset from the plane of the oyster cages during extreme weather such as typhoons. This prevents damage to the mounting frame, cleaning mechanism, and oyster cages caused by excessive collisions, which could affect the subsequent cleaning effect and the growth status of oysters, resulting in economic losses. At the same time, the cleaning component is fixedly connected to the floating assembly and swings under the action of water flow and waves. This can dissipate the energy input of wind and waves to the floating assembly, thereby reducing the impact of wind and waves on the overall cage aquaculture system and keeping the floating assembly relatively stable in wind and waves. This swinging motion also allows the floating assembly to adapt more flexibly to changes in wind and waves, reducing excessive stress and deformation caused by wind and waves, which helps to extend the service life of the floating assembly and reduce maintenance costs.

[0018] Furthermore, the main body of the floating raft includes a truss and connecting pipes. The truss includes floating pipes, and several of these floating pipes are arranged in a U-shape or similar pattern, connected by heat fusion. Several connecting pipes are connected inside the truss, and the connecting pipes and / or the connecting pipes and the truss enclose multiple floating raft units arranged in a rectangular array. By setting the truss of the floating raft assembly to a U-shape with heat fusion connections, and connecting adjacent floating pipes together with multiple connectors, it is less prone to disintegration, thereby improving the stability and wave resistance of the truss. At the same time, by connecting multiple connecting pipes to the inside of the truss to form a stable mesh structure, the stability of the truss is further enhanced, preventing the truss from disintegrating and causing serious impacts on the environment and oyster production.

[0019] Furthermore, the middle of each cage frame is erected on a connecting pipe shared by two adjacent floating units, and the ends of the frame are erected on the floating pipes and / or connecting pipes on both sides of the two adjacent floating units. Alternatively, the frame is connected to the floating pipes and / or connecting pipes on both sides of the two adjacent floating units via cables or fasteners. Several floats are respectively installed in the area of ​​the frame within each floating unit. Several hooks are installed on the frame for connecting to a boom. By erecting the ends and middle of the long pipe on the floating pipes and connecting pipes, the cage frame assembly is more stably supported, preventing the force exerted by the cage frame assembly on the floating pipes and / or connecting pipes from being concentrated mainly at the connection points of the ropes or fasteners, which could easily lead to damage at the connections between the floating pipes and / or connecting pipes and the ropes or fasteners.

[0020] Furthermore, the self-cleaning modular gravity cage aquaculture system also includes netting with a smaller aperture than that of the oyster cages, with several netting units detachably connected to the outside of the oyster cages; or, the netting units are detachably connected to the cage frame, the floating unit, or the truss, and are fitted onto the outside of all the oyster cages on the cage frame, the floating unit, or the truss. With this configuration, the netting units can filter silt and attached organisms from the water flow, reducing the deposition of silt and attached organisms at the oyster cages. By periodically replacing the netting units and transporting them to the factory for cleaning, the frequency of cleaning the oyster cages is reduced, thereby minimizing the impact of the oyster cage cleaning process on oyster growth. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of oyster farming in Embodiment 1 of the present invention.

[0022] Figure 2 for Figure 1 BB cross-section.

[0023] Figure 3 for Figure 1 A magnified view of a portion of the image.

[0024] Figure 4 This is a schematic diagram of the main structure of the floating liner.

[0025] Figure 5 for Figure 4 The diagram shows the structural schematic of the truss of the main floating hull.

[0026] Figure 6 for Figure 2 The top view of the cage and cleaning components shown.

[0027] Figure 7 for Figure 6 CC cross-section view.

[0028] Figure 8 for Figure 7The diagram shows the sinking state of the cleaning component.

[0029] Figure 9 for Figure 6 DD cross-sectional view.

[0030] Figure 10 This is a structural schematic diagram of the connector.

[0031] Figure 11 This is a schematic diagram of the cage structure.

[0032] Figure 12 This is a schematic diagram of the cleaning mechanism described in Example 3.

[0033] Figure 13 for Figure 12 The diagram shows the sinking state of the cleaning component.

[0034] Figure 14 This is a schematic diagram of the cleaning mechanism described in Example 4, wherein each cleaning mechanism is at a different rotation angle.

[0035] Figure 15 for Figure 14 Side view of the cleaning mechanism shown.

[0036] Figure 16 for Figure 14 Top view of the cleaning mechanism shown.

[0037] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings. Detailed Implementation

[0038] Example 1

[0039] Please see Figures 1-5 This is a structural schematic diagram of the self-cleaning modular gravity cage aquaculture system provided in this embodiment. The aquaculture system includes a floating raft assembly 10, a cage frame assembly 20, oyster cages 30, an anchoring assembly 40, and a cleaning assembly 50. The floating raft assembly 10 includes several floating raft units A arranged in a rectangular array. Several cage frame assemblies 20 are detachably connected to at least one of the floating raft units A, and the oyster cages 30 are hung on the cage frame assemblies 20 for oyster farming. The anchoring assembly 40 is located 6 meters below the seabed and connected to the floating raft assembly 10 to fix the floating raft assembly 10, thereby enhancing the stability of the oyster raft. The cleaning assembly 50 is connected to the floating raft assembly 10 and is located between at least two oyster cages 30 to clean the oyster cages 30 under the action of waves and currents.

[0040] Specifically, the floating assembly 10 comprises a truss 11 and connecting pipes connected inside the truss 11 to form a plurality of floating units A arranged in a rectangular array. In some embodiments, the truss 11 and / or the bottom of the connecting pipes are provided with floating barrels to enhance the buoyancy of the floating assembly 10.

[0041] The truss 11 comprises horizontal floating pipes 111 and vertical floating pipes 112, and a plurality of the horizontal floating pipes 111 and a plurality of the vertical floating pipes 112 are sequentially connected by heat melting at the ends to form a truss 11 arranged in a back-shaped or back-like shape. Adjacent two horizontal floating pipes 111 and two vertical floating pipes 112 are arranged side by side by a plurality of connecting pieces 14. Preferably, two horizontal floating pipes 111 and two vertical floating pipes 112 are sequentially connected by heat melting at the ends to form a first rectangular frame, and two horizontal floating pipes 111 and two vertical floating pipes 112 are arranged to form a second rectangular frame slightly smaller than the first rectangular frame. One end of two horizontal floating pipes 111 and two vertical floating pipes 112 in the second rectangular frame protrudes from the second rectangular frame and is connected with the vertical floating pipe 112 or the horizontal floating pipe 111 of the first rectangular frame to form a back-shaped rectangular truss 11. In this embodiment, the end of each floating pipe is connected with other floating pipes by heat melting, the middle of each floating pipe is connected with other floating pipes by a plurality of connecting pieces 14, and the end of each connecting pipe is fixedly connected with the second rectangular frame to enhance the stability of the truss 11 and avoid the truss 11 from being scattered by wind and waves.

[0042] The connecting pipes include transverse connecting pipes 121 and vertical connecting pipes 122. The transverse connecting pipes 121 include first transverse connecting pipes 121a and second transverse connecting pipes 121b. The first transverse connecting pipes 121a are arranged at the middle of the second direction of the truss 11, and the two ends of each first transverse connecting pipe 121a are fixedly connected with the truss 11 in the width direction, and two first transverse connecting pipes 121a are connected in parallel with each other by a plurality of connecting members 14. The transverse floating pipe 111 and the adjacent first transverse connecting pipe 121a are spaced apart by a plurality of vertical connecting pipes 122 and a plurality of second transverse connecting pipes 121b. One end of the vertical connecting pipe 122 is fixedly connected with the transverse floating pipe 121b or the first transverse connecting pipe 121a, and the other end is fixedly connected with the second transverse connecting pipe 121b. The two ends of the second transverse connecting pipe 121b are respectively fixedly connected with the two vertical floating pipes 122b. In the embodiment, the first direction is the length direction of the floating assembly 10, and the second direction is the width direction of the floating assembly 10. The widths of the floating assembly units A in the second direction of the truss 11 are consistent, and the lengths of at least two floating assembly units A are different. Preferably, the lengths of the floating assembly units A located at the two ends of the truss 11 in the first direction are smaller than the lengths of the floating assembly units A located at the middle of the truss 11 in the first direction, and the lengths of the floating assembly units A in the second direction are different. In other embodiments, the first direction can also be the width direction, and the second direction can also be the length direction, which is not limited in this way.

[0043] Further, the floating assembly 10 is arranged in the water flow direction in the width direction to reduce the force of the water flow and sea waves on the floating assembly 10, and improve the stability of the floating assembly 10.

[0044] Referring to Figures 2-9The net cage culture system comprises a plurality of rows and a plurality of columns of oyster cages 30, and a cleaning assembly 50 is arranged on one side or both sides of each row or column of oyster cages 30, so that each oyster cage 30 can be in contact with the cleaning assembly 50 to facilitate cleaning of the oyster cage 30 by the cleaning assembly 50. The cleaning assembly 50 comprises a mounting frame 51, a cleaning mechanism 52 and a lifting mechanism 53. The mounting frame 51 is connected to the floating assembly 10, and the mounting frame 51 is arranged between two adjacent rows of oyster cages 30 and parallel to the horizontal floating pipe 111 or the vertical floating pipe 112. The top end of at least one cleaning mechanism 52 is connected to the mounting frame 51, and the length of the cleaning mechanism 52 is equal to or close to that of the oyster cage 30. The cleaning mechanism 52 comprises a cleaning frame 521 arranged vertically and a brush part 522 arranged along the length direction of the cleaning frame 521. The mounting frame 51 swings under the impact of water flow and sea waves, driving the cleaning mechanism 52 to swing, so that the mounting frame 51 and / or the brush part 522 collide with and rub against the oyster cage 30 adjacent to the mounting frame 51, thereby cleaning the deposited silt and attached organisms on the oyster cage 30. The lifting mechanism 53 drives the cleaning mechanism 52 to move up and down in the vertical direction, so that the projection of the cleaning mechanism 52 in the vertical plane can overlap or be staggered with the oyster cage 30. By controlling the depth of the cleaning mechanism 52, the swing angle of the mounting frame 51 and / or the cleaning mechanism 52 can be prevented from being too large to cause a large impact force on the oyster cage 30. Specifically, in extreme weather such as typhoon, the lifting mechanism 53 is started to make the cleaning mechanism 52 sink and stagger with the plane where the oyster cage 30 is located, thereby avoiding excessive collision between the cleaning mechanism 52 and the oyster cage 30, preventing damage to the cleaning mechanism 52 and the oyster cage 30, and affecting the subsequent cleaning effect and the growth state of oysters. In the embodiment, the oyster cages 30 arranged along the length direction of the cage frame assembly 20 are taken as the oyster cages 30 of each row, and the oyster cages 30 arranged along the width direction of the cage frame assembly 20 are taken as the oyster cages 30 of each column.

[0045] In some embodiments, a cleaning assembly 50 is arranged between every two adjacent columns and / or two columns of oyster cages 30, and a plurality of cleaning mechanisms 52 are arranged along the length direction of the mounting frame 51 in each cleaning assembly 50. The plurality of cleaning mechanisms 52 are respectively located between two adjacent oyster cages 30 in the same row or column, so that each oyster cage 30 can be in contact with one to eight cleaning mechanisms 52, and the multiple surfaces can be effectively cleaned, thereby maximizing the underwater cleaning effect of the oyster cage 30, promoting water exchange inside and outside the oyster cage 30, prolonging the time interval of the water washing of the oyster cage 30, and saving costs.

[0046] In some embodiments, the cleaning assembly 50 is provided on only one side of each column of oyster cages 30, and each oyster cage 30 is provided with only one cleaning mechanism 52, i.e. each oyster cage 30 is in contact with only one cleaning mechanism 52. In this way, the total number of cleaning assemblies 50, especially the cleaning mechanisms 52, is reduced, the resistance of the cleaning assemblies 50, especially the cleaning mechanisms 52, to the water flow and the adsorption of plankton are reduced, the water flow in the area where the whole cage culture system is located is promoted, and the cost is saved.

[0047] Further, in some embodiments, the mounting frame 51 comprises a hanging rope 511 and a mounting rod 512, the hanging rope 511 connects the mounting rod 512 to the floating assembly 10, and the narrow surface of the mounting rod 512 faces the water flow direction, i.e. the mounting rod 512 is parallel to the transverse floating pipe 111. The top end of the cleaning frame 521 is rotationally connected to the mounting rod 512, and a plurality of cleaning frames 521 are arranged along the length direction of the mounting rod 512, each cleaning frame 521 is adjacent to at least two oyster cages 30, each oyster cage 30 is adjacent to one cleaning frame 521, and preferably at least part of the cleaning frames 521 are adjacent to four oyster cages 30. Under the action of the water flow and the sea waves, the rotation of the cleaning frame 521 relative to the mounting rod 512 drives the rotation of the brush part 522, thereby avoiding the brush part 522 from hindering the water flow, and at the same time, the rotation of the brush part 522 causes the free end of the brush part 522 to collide and rub with the oyster cage 30, which helps to clean the deposits and attachments on the oyster cage 30 and promotes the circulation of the water inside and outside the oyster cage 30.

[0048] In some embodiments, the top end of the cleaning frame 521 is fixedly or rotationally connected to the mounting rod 512, and the brush part 522 is rotationally connected to the cleaning frame 521, which can rotate relative to the cleaning frame 521 under the action of the water flow and the sea waves.

[0049] In some embodiments, the mounting rod 512 is provided with a swing groove, and the top end of the cleaning frame 521 is movably arranged in the swing groove, and the cleaning frame 521 can swing relative to the mounting rod 512 under the action of the water flow and the sea waves.

[0050] Further, in some embodiments, the free end of the brush part 522 in contact with the oyster cage 30 is designed in a zigzag shape, a wave shape or the like, or the free end of the brush part 522 is provided with bristles, or the contact surface of the brush part 522 with the oyster cage 30 is designed as a friction surface with a large friction coefficient, so as to enhance the cleaning effect on the oyster cage 30. In other embodiments, the brush part 522 can be a brush.

[0051] Preferably, the bristles of the brush part 522 are made of flexible materials such as silica gel, which can avoid damaging the oyster cage 30, and at the same time, the silica gel can reduce the adsorption and deposition of organisms and silt on the brush part 522.

[0052] Preferably, the main body of the brush portion 522 is made of a non-stick material such as silica gel, PTFE or graphene, or the surface of the main body of the brush portion 522 is coated with a non-stick material such as fluororesin coating, nano coating, polydimethylsilane coating or PTFE, so as to reduce the adhesion between the attached organisms and the brush portion 522 and reduce the maintenance cycle of the brush portion 522. More preferably, the mounting rod 512 and the surface of the cleaning rack 521 are coated with a non-stick material such as fluororesin coating, nano coating, polydimethylsilane coating or PTFE, so as to reduce the adhesion of organisms to the cleaning assembly 50 and enhance the service life of the cleaning assembly 50.

[0053] In some embodiments, the brush portion 522 can be provided as an integrated structure with a length similar to that of the cleaning rack.

[0054] In some embodiments, a through hole is formed in the middle of the brush portion 522 to reduce the blocking effect of the brush portion 522 on the water flow.

[0055] Further, when the water flow is stationary or in a natural state, the distance between the cleaning rack 521 and two to four adjacent oyster cages 30 is approximately equal, so that the brush portion 522 can act on each oyster cage 30 more evenly.

[0056] In some embodiments, the length of the cleaning rack 521 is equal to or similar to that of the oyster cage 30, and the brushes are uniformly arranged on the outer periphery of the cleaning rack 521, thereby increasing the cleaning effect of the brushes on the oyster cage 30.

[0057] Further, the lifting mechanism 53 is arranged on a vertical float pipe 112 and comprises a winding part 531 for winding the lifting rope 511. One end of the lifting rope 511 is connected to the winding part 531 of the lifting mechanism 53, and the other end is fixed to another vertical float pipe 112 away from the lifting mechanism 53 through the mounting rod 512. The lifting mechanism 53 lifts the mounting rack 51 and the cleaning mechanism 52 by winding the lifting rope 511, so that the mounting rack 51, the cleaning mechanism 52 and / or the oyster cage 30 overlap, and the oyster cage 30 can be cleaned. The lifting mechanism 53 lowers the mounting rack 51 and the cleaning mechanism 52 by releasing the lifting rope 511, so that the mounting rack 51, the cleaning mechanism 52 and the oyster cage 30 are staggered. In extreme weather such as typhoon, the mounting rack 51 and the cleaning mechanism 52 are lowered by the lifting mechanism 53 to stagger with the oyster cage 30, so as to avoid the damage of the cleaning mechanism 52 and the oyster cage 30 caused by excessive collision between the cleaning mechanism 52 and the oyster cage 30, which affects the subsequent cleaning effect and the growth state of the oyster, and causes economic loss. At the same time, the cleaning assembly 50 is fixedly connected to the floating raft assembly 10, and swings under the action of water flow and sea waves, so as to dissipate the energy input of the wind and wave to the floating raft, thereby reducing the impact of the wind and wave on the whole net cage culture system, making the floating raft keep a relatively stable state in the wind and wave, and the swing of the floating raft assembly can make the floating raft assembly more flexible to adapt to the change of the wind and wave, reduce the excessive stress and deformation caused by the wind and wave, and help to prolong the service life of the floating raft and reduce the maintenance cost.

[0058] Further, in some embodiments, the lifting mechanism 53 comprises an operating part and a locking part, the winding part 531 of the lifting mechanism 53 is a rotating roller, the operating part rotates the rotating roller under the action of external force to realize winding or releasing the lifting rope 511, and the locking part is used for locking the rotating roller and locking the length of the lifting rope 511 released, so as to make the mounting rod 512 keep the required depth. When it is needed to adjust the depth of the mounting rod 512, the locking part is in an unlocked state, the operating part winds or releases the lifting rope 511, and the locking part locks the rotating roller after the mounting rod 512 reaches the required position.

[0059] Further, in some embodiments, the lifting mechanism 53 comprises a controller electrically connected with the winding part 531 and used for controlling the winding part 531 to wind or release the lifting rope 511.

[0060] In some embodiments, at least two mounting racks 51 are controlled by the same lifting mechanism 53 to improve the convenience of operation, the lifting mechanism 53 further comprises mounting plates 532, a plurality of mounting plates 532 are arranged at intervals along the winding part 531, a plurality of winding grooves are formed on the winding part 531, the winding grooves are used to fixedly connect the lifting ropes 511 of a mounting rack 51, thereby avoiding the lifting ropes 511 of a plurality of mounting racks 51 from being entangled with each other, affecting the lifting effect, at the same time, the weight of the mounting racks 51 is evenly distributed, making the entire cleaning assembly 50 and the floating raft assembly 10 more stable.

[0061] In some embodiments, the lifting mechanism 53 of each cleaning assembly 50 is provided in two, respectively arranged on the vertical floating pipes 112 at both ends of the floating raft assembly 10, and the two ends of the lifting rope 511 are fixedly connected with the winding part of a lifting mechanism 53.

[0062] Further, the floating raft assembly 10 further comprises floating barrels, connecting pieces 14, a pedal 15 and a fixed pipe 16, a plurality of floating barrels are fixedly arranged at the bottom of the truss 11 and / or the bottom of the two first transverse connecting pipes 121a, and the narrow surface of the floating barrel is arranged in the direction of the water flow to reduce the force of the water flow and sea waves on the floating raft body 10, and improve the stability of the floating raft body 10.

[0063] Referring to Figure 10 The connecting piece 14 comprises a bracket 141, the bracket 141 is an integrally formed bracket structure, the left and right sides of the bracket 141 are provided with insertion holes 142, the floating pipe or the connecting pipe passes through the insertion holes 142 to realize the connection between the connecting piece 14 and two adjacent floating pipes or two adjacent connecting pipes. The connecting piece 14 connected with the floating pipe further comprises a handrail stand 143 fixedly arranged at the top of the bracket 141, the handrail stand 143 is located outside the truss 11, and a plurality of connecting holes 143a are arranged on the handrail stand 143. The fixed pipe 16 passes through the connecting holes 143a of the corresponding connecting pieces 14 in sequence and is sequentially connected end to end to form a fixed frame, and multiple fixed frames further enhance the stability of the truss 11 and play a protective role for people walking on the pedal. Preferably, two connecting holes 143a are arranged on the handrail stand 143, the distance between the two connecting holes 143a is 50-70 cm, and the height of the connecting piece 14 with the handrail stand 143 is 110-130 cm.

[0064] The pedal 15 is arranged above the truss 11 and / or the connecting pipe. Specifically, the top of the bracket 141 is provided with a pedal mounting base, and the pedal 15 is fixedly connected with the pedal mounting base through a locking piece. Preferably, the width of the pedal is greater than 350 mm, and the thickness is greater than 65 mm.

[0065] Referring to Figure 11The cage assembly 20 comprises a frame 21 and a float 22, wherein the float 22 is arranged below the frame 21 and connected by a binding rope or a fastener. Specifically, the frame 21 comprises a long pipe 211, a short pipe 212 and a support pipe 213. A plurality of long pipes 211 and a plurality of short pipes 212 are connected to each other to form a main body of the frame 21. A plurality of support pipes 213 are arranged above the main body of the frame 21 and used for hanging oyster cages 30.

[0066] In some embodiments, at least two long pipes 211 and at least two short pipes 212 are perpendicular to each other to form a rectangular frame main body. A plurality of support pipes 213 are arranged above the long pipes 211, extend along the length direction of the short pipes 212 and are fixedly connected to at least two long pipes 211. At least two floats 22 are symmetrically arranged at the bottom of the frame 21 and are fixedly connected to the corresponding long pipes 211 and / or short pipes 212. The floats 22 provide buoyancy to the cage assembly 20 and maintain the balance and stability of the cage assembly 20.

[0067] Further, each cage assembly 20 is arranged on at least two floating row units A. Specifically, the frame 21 of the cage assembly 20 is arranged on a connecting pipe shared by at least two adjacent floating row units A. A plurality of oyster cages 30 are hung on the frame 21 in the region of each floating row unit A, and a plurality of floats 22 are fixedly arranged at the bottom. By arranging the cage assembly 20 on the connecting pipe shared by at least two floating row units A, the mechanical installation and harvesting of the cage assembly 20 are facilitated. Further, the cage assembly 20 is connected to the truss 11 and / or the connecting pipe forming the floating row unit A by a cable or a fastener, which improves the stability and wave resistance of the oyster row and prevents the cage assembly 20 from separating from the floating row assembly 10.

[0068] Further, in the present embodiment, the frame 21 comprises four long pipes 211 arranged perpendicularly to two short pipes 212. The short pipes 212 and the long pipes 211 are connected by a four-way connector or a hot melt connector. The long pipes 211 located on the outer side of the frame 21 and their adjacent long pipes 211 form a long pipe assembly. Two long pipe assemblies are arranged at the two ends of the short pipes 212 and extend outwardly along a direction perpendicular to the short pipes 212, which are used to connect the floating row assembly 10. A plurality of support pipes 213 are arranged on the long pipes 211 and are fixedly connected to the four long pipes 211. The support pipes 213 and the short pipes 212 extend outwardly along a direction perpendicular to the long pipes 211 to increase the number of oyster cages 30 that can be hung on the cage assembly 20.

[0069] Specifically, the frame 21 of the cage rack 20 is arranged on the connecting pipe shared by at least two adjacent floating row units A, the cage rack 20 is hung on the frame 21 in the area of each floating row unit A and is provided with a plurality of oyster cages at the bottom and a plurality of floats 22, and at least two cage racks are arranged on the two adjacent floating row units. By arranging the cage rack 20 on the connecting pipe shared by at least two floating row units A, the cage rack 20 is facilitated to be installed and harvested mechanically. Further, the cage rack 20 is connected to the truss 11 and / or the connecting pipe forming the floating row unit A by a cable or a fastener, so as to improve the stability and the wind and wave resistance of the oyster row and avoid the cage rack 20 from being separated from the floating row body 10.

[0070] Further, one end of the long pipe 211 of the cage rack 20 is arranged on the truss 11 and is clamped with the connecting piece 14 on the truss 11, and the other end is arranged on the first transverse connecting pipe 121a and is clamped with the connecting piece 14 on the first transverse connecting pipe 121a, so as to facilitate the quick installation of the cage rack 20 and the floating row body 10.

[0071] Further, the cage rack 20 further comprises hooks, a plurality of the hooks are symmetrically arranged on the frame 21, the hooks are matched with the hooks of the lifting arm, and the cage rack 20 is facilitated to be installed or harvested by the lifting arm of the working ship.

[0072] In some embodiments, the oyster cage 30 comprises a net cage and a plurality of layers of partitions arranged in the net cage, a plurality of flexible cables are arranged on the net cage and pass through and fix the partitions, the net cage is divided into a plurality of breeding chambers by the partitions, and the top of the net cage is connected to the cage rack assembly 20 by the cables. When the oyster cage 30 is used, the flexible cables increase the flexibility of the entire oyster cage 30, so that the flexible cables can move with the wind and waves, and the wind and wave resistance and the unit water yield of the oyster cage 30 can be improved. A plurality of small holes are arranged on the partitions for water circulation, so as to provide a good growth environment for oysters and improve the meat quality and the meat yield of the oysters. When not in use, the partitions can be stacked to reduce the occupied space and facilitate use.

[0073] In some embodiments, the cage rack assembly 20 further comprises fasteners, a plurality of the fasteners are fixed to the support pipe 213 and / or the short pipe 212, the oyster cage 30 is connected to the fasteners by cables, and the oyster cage 30 is facilitated to be installed or disassembled quickly by manually opening and closing the fasteners. When the brush part 522 of the cleaning assembly 50 is in contact with the oyster cage 30, the brush part 522 directly rubs with at least part of the net cage on one hand, so as to clean the deposited silt on the net cage and help to wipe off the organisms that are about to attach to the net cage, thereby reducing the attached organisms and avoiding cleaning after the organisms are firmly attached, which leads to an increase in cleaning difficulty. In addition, the brush part 522 collides with the partitions, so as to promote the silt on the surface of the partitions and the net cage to fall off, thereby improving the cleaning effect.

[0074] Further, a fixed partition knot is arranged on the flexible cable below each partition, the flexible cable is interwoven by multiple fiber strands, the partition is a horizontally arranged partition plate, or a downwardly recessed conical plate or arc plate, the conical plate and arc plate can save breeding space, increase oyster yield, and reduce the influence of wind and wave on the oyster cage 30 and oysters, and prolong the service life.

[0075] Further, in some embodiments, the net cage breeding system comprises a net cover, and the outer side of the net cage 31 of each oyster cage 30 is detachably connected with a net cover, the aperture of the net cover is smaller than the aperture of the net cage 31, and the net cover is used to filter silt, attached organisms and the like in the water flow, so as to reduce the deposition of silt and attached organisms at the oyster cage 30. By regularly replacing the net cover and transporting the net cover to the factory for cleaning, the cleaning frequency of the oyster cage 30 is reduced, and the influence of the cleaning process on the growth of oysters is reduced. Preferably, the net cover is detachably connected to the cage rack 20 and is sleeved on the outside of all oyster cages 30 on the cage rack 20, or the net cover is detachably connected to the floating row assembly 10 and is sleeved on the outside of all oyster cages 30 in each floating row unit A or in the floating row assembly 10.

[0076] Further, the anchoring assembly 40 comprises anchor piles 41, and a plurality of anchor piles 41 are symmetrically arranged on the outer side of the floating row assembly 10 and are connected to the width direction of the floating row assembly 10. By fixedly arranging the anchor piles 41 on both sides of the floating row assembly 10 in the width direction, the influence of wind and wave on the width direction of the floating row assembly 10 is reduced, and the wind and wave resistance of the oyster row is further improved.

[0077] Further, in some embodiments, the net cage breeding system further comprises a remote communication module for realizing remote signal interaction between the controller and an external control end, so as to facilitate the breeder to remotely control the lifting mechanism 53. When the breeder receives a wind and wave warning, the breeder can timely control the cleaning rack 521 to sink and be staggered with the oyster cage 30 through the remote communication module, so as to reduce the excessive collision of the cleaning rack 521 on the oyster cage 30 under extreme weather such as typhoon.

[0078] Further, the buoyancy of the cleaning assembly 50 is arranged to be equivalent to or slightly smaller than the gravity of the cleaning assembly 50, so as to reduce the force of the cleaning assembly 50 on the floating row assembly 10, especially the force in the vertical direction.

[0079] Further, the truss 11 and the connecting pipe are made of high-density polyethylene (HDPE) material, and the connecting piece 14 is made of HDPE raw material by injection molding. More preferably, the second transverse connecting pipe 121b is an HDPE pipe with a reinforcing rib or layer inside to withstand the downward pressure of the cage assembly 20 on the second transverse connecting pipe 121b. By enhancing the strength of the floating body 10 at certain positions, the strength of the positions mainly bearing the weight of the oyster cages is improved while minimizing the gravity and improving the buoyancy, preventing the floating body 10 from breaking due to insufficient strength, causing the oyster cages to be lost and affecting economic benefits. In addition, the floating body made of HDPE raw material has the advantages of better wear resistance, ultraviolet resistance, ductility, corrosion resistance, and high temperature resistance, avoiding the corrosion of the floating body caused by seawater immersion and long-term sun and rain, leading to its damage and difficulty in maintenance.

[0080] Further, in some embodiments, the floating pipe is made of an HDPE pipe with an outer diameter of 315 mm and a wall thickness of greater than or equal to 12 mm, the connecting pipe is made of an HDPE pipe with an outer diameter of greater than 300 mm and a wall thickness of greater than or equal to 15 mm, the long pipe 212 and the short pipe 211 are made of an HDPE pipe with an outer diameter of 125 mm and a wall thickness of greater than or equal to 7.4 mm, the support pipe 213 is made of an HDPE pipe with an outer diameter of 90 mm and a wall thickness of greater than or equal to 6.7 mm, and the specifications of the floating bucket and the float 22 are 0.94 m long, 0.58 m wide, and 0.62 m high. In other embodiments, the dimensions of the truss 11, the connecting pipe, the long pipe 212, the short pipe 211, and the support pipe 213 can be set according to specific requirements.

[0081] Further, in some embodiments, the inside of the support pipe 213 and the short pipe 212 is provided with a reinforcing rib or reinforcing layer for improving the strength of the HDPE pipe, and the material of the reinforcing rib or reinforcing layer includes reinforcing materials such as glass fiber. By enhancing the strength of the support pipe 213 and the short pipe 212, they can withstand the pulling force of the oyster cages 30 on the support pipe 213 and the short pipe 212 when hoisting the cage assembly 20, thereby improving the strength and stability of the cage assembly 20. In addition, when the support pipe 213 is damaged under stress, the support pipe 213 and / or the short pipe 212 connected by the four-way piece can be easily repaired and replaced by the farmers. The long pipe 211 is made of HDPE, which is hollow inside or filled with hydrophobic rock wool or other environmentally friendly fillers, thereby providing good buoyancy support at sea and ensuring safety in use. The long pipe 211 together with the float 22 provides buoyancy for the cage assembly 20, reduces the pressure of the cage assembly 20 on the floating raft assembly, and reduces the damage of the connecting pipe under pressure. By setting the local strength and local buoyancy of the frame 21, the position of the cage assembly 20 hanging the oyster cage 30 is improved in strength while minimizing gravity and improving buoyancy, preventing the cage assembly 20 from being damaged and scattered due to insufficient strength, resulting in the loss of oyster cages and affecting economic benefits.

[0082] Further, the second transverse connecting pipe 121b is an HDPE pipe provided with a reinforcing rib or reinforcing layer inside to withstand the downward pressure of the cage assembly 20 on the second transverse connecting pipe 121b. In some embodiments, the first transverse connecting pipe 121a and the transverse floating pipe 111b are reinforced pipes, and the connection between the connecting pipe and the truss 11 is strengthened by a component to enhance the strength of the connection.

[0083] Further, the connection between the floating pipe and the connecting pipe, the connection between the floating pipe and the connecting piece 14, and the connection between the floating pipe and the lifting rope 511 or the lifting mechanism 53 are provided with a reinforcing structure on the outside and / or a reinforcing structure inside the corresponding connection of the floating pipe to enhance the strength of the connection and prevent deformation or damage of the connection under stress.

[0084] In some embodiments, the structure of the float 22 is similar to that of the floating bucket, except that the diameter of the insertion hole of the float 22 is smaller than that of the floating bucket. In some embodiments, the float 22 includes a floating bucket body 131 and a connecting component 132, the floating bucket body 131 includes a streamlined barrel and a protruding part above the streamlined barrel, and the protruding part is provided with a recessed accommodation groove. The support pipe 213 can pass through the accommodation groove and be connected with the float 22, further enhancing the stability of the cage assembly 20 and preventing the cage assembly 20 from being blown away by strong winds.

[0085] The water flow direction of the sea area where the net cage culture system is located is usually mainly in one direction due to the influence of prevailing winds, earth rotation deflection force and the like, but the intersection of warm and cold currents, topographic influence, seasonal changes, tides and other factors will cause the direction and intensity of the water flow and waves to change frequently, which will cause the installation frame 51 to swing and the cleaning mechanism 52 to rotate. In this embodiment, during oyster culture, the cleaning mechanism 52 is affected by the water flow and waves to rotate and / or swing, causing the free end of the brush part 522 to rub and collide with the oyster cage 30, and at least part of the deposited silt and attached organisms on the oyster cage 30 are cleaned by the brush part 522, thereby extending the time interval for cleaning the oyster cage 30 on the water from 1-2 months to 3-5 months, reducing the workload and cost of the breeder in oyster culture, and also reducing the impact of water cleaning on oysters.

[0086] Embodiment 2

[0087] The self-cleaning modular gravity net cage culture system provided in this embodiment has a structure similar to that of Embodiment 1, and the difference lies in that the length direction of the installation rod 512 is arranged to face the water flow direction, i.e., the installation rod 512 is parallel to the vertical floating pipe 112, the lifting mechanism 53 is installed on the horizontal floating pipe 111, and the hanging rope 511 is connected with the horizontal floating pipe 111 and / or the lifting mechanism 53.

[0088] In some embodiments, each cleaning assembly 50 is arranged between the horizontal floating pipe 111 and the first horizontal connecting pipe 121a adjacent thereto. Preferably, each cage rack assembly 20 includes two short pipes 212 and six support pipes 213, 4-6 oyster cages 30 can be hung on the short pipes 212 and the support pipes 213, four cleaning mechanisms 52 are arranged for each cleaning assembly 50, and each cleaning mechanism 52 is responsible for cleaning 3-4 adjacent oyster cages 30.

[0089] In some embodiments, each cleaning assembly 50 is arranged between the horizontal floating pipes 111 at both ends of the floating row assembly 10. Preferably, eight cleaning mechanisms 52 are arranged for each cleaning assembly 50, and each cleaning mechanism 52 is responsible for cleaning 3-4 adjacent oyster cages 30.

[0090] In this embodiment, the installation rod 512 swings due to the influence of the main water flow direction, collides with the oyster cage 30, and at the same time, the water flow and waves cause the cleaning mechanism 52 to rotate, causing the brush part 522 to rub and collide with the oyster cage 30. The synergistic effect of the swinging of the installation rod 512 and the rotation of the cleaning mechanism 52 can increase the contact area of the brush part 522 with the oyster cage 30, thereby enhancing the cleaning effect of the brush part 522 on the oyster cage 30, thereby extending the time interval for cleaning the oyster cage 30 on the water from 1-2 months to 4-5 months, reducing the workload and cost of the breeder in oyster culture, and also reducing the impact of water cleaning on oysters.

[0091] Embodiment 3

[0092] Please refer to Figures 12-13 The self-cleaning module type gravity net cage culture system provided in the embodiment is similar to that in Embodiment 1 or Embodiment 2, and the difference lies in that the cleaning mechanism 52 is arranged between two adjacent oyster cages 30, the two adjacent oyster cages 30 are located on the two sides of the mounting rod 512 respectively, the cleaning frame 521 is fixedly arranged on the mounting rod 512, and the brush part 522 is arranged on the two sides of the cleaning frame 521 close to the two adjacent oyster cages 30 respectively. Under the action of water flow and sea waves, the mounting rod 512 swings between the two adjacent oyster cages 30, drives the cleaning frame 521 to swing, and makes the brush part 522 contact with the adjacent oyster cage 30, so that the oyster cage 30 is cleaned.

[0093] Preferably, the brush part 522 is in an inverted triangular structure, that is, the length of the upper end of the brush part 522 is greater than that of the lower end. When the cleaning frame 521 swings to form a certain angle with the vertical plane, the free end of the brush part 522 collides with and rubs against one of the two adjacent oyster cages 30, so that the oyster cage 30 is cleaned and the adsorption and obstruction of the brush part 522 to the water flow are reduced. Preferably, the plane formed by the free end of the brush part 522 forms an angle a with the vertical plane. When the cleaning frame 521 swings to form an angle greater than the angle a with the vertical plane, the free end of the brush part 522 collides with and rubs against the oyster cage 30.

[0094] In other embodiments, the top end of the cleaning frame 521 is movably connected to the mounting rod 512, and the cleaning frame 521 can swing between the two adjacent oyster cages 30 relative to the mounting rod 512, approach or move away from an oyster cage 30, so that the free end of the brush part 522 collides with and rubs against the oyster cage 30.

[0095] In some embodiments, the mounting rod 512 is provided with at least one sliding rail along the length direction thereof, and a plurality of cleaning frames 521 are slidably arranged in the sliding rail respectively. The length of the sliding rail is equal to the distance between two to four oyster cages 30 arranged continuously along the length direction or the width direction of the floating raft assembly 10. Under the action of water flow and wind waves, the cleaning frame 521 slides along the sliding rail, and at the same time, the mounting rod 512 and / or the cleaning frame 521 swings, so that the brush part 522 collides with and rubs against the oyster cages 30 on the two sides of the mounting rod 512.

[0096] In this embodiment, the swing of the installation rod 512 drives the cleaning mechanism 52 to swing, which makes the brush part 522 collide and rub against the oyster cage 30 on both sides, and thus at least part of the deposited silt and attached organisms on the oyster cage 30 is cleaned by the brush part 522, thereby extending the time interval for cleaning the oyster cage 30 in water from 1-2 months to 3-5 months, reducing the workload and cost of the oyster farmers in oyster farming, and also reducing the impact of water cleaning on the oysters.

[0097] Embodiment 4

[0098] Please refer to Figures 14-16 The self-cleaning modular gravity-type net cage aquaculture system provided in this embodiment has a structure similar to that of Embodiment 1 or Embodiment 2, except that the structure of the brush part 522 is different: the brush part 522 includes a plurality of brush heads 523 similar in structure, which are arranged along the length direction of the cleaning frame 521 and are fixedly connected with the cleaning frame 521, and the projections of the plurality of brush heads 523 on the horizontal plane at least partially overlap, i.e., the angles between the plurality of brush heads and the installation rod 512 are not equal, so that the water flow in the same direction has a larger area when contacting the cleaning frame 521 at different rotation angles, which is sufficient to drive the cleaning frame 521 to rotate a larger angle or for a longer time, thereby promoting the brush head 523 to fully contact the oyster cage 30. At the same time, it avoids the brush head 523 located below from hindering the attachment and sediment cleaned above, resulting in their re-deposition on the oyster cage 30.

[0099] Preferably, the angle between any two brush heads 523 is less than 180°, so that when the cleaning frame 521 rotates to any angle, its blocking area to the water flow is relatively small, reducing the hindering effect on the water flow, promoting the water flow, and enabling the water body in the net cage aquaculture system area to fully exchange with the external water body, thereby improving the cleanliness and nutrient content of the water body and promoting the growth of oysters. More preferably, the angle between any two brush heads 523 is 60-120°, and more preferably 90°, further reducing the blocking area of the brush part 522 to the water flow, making the water flow unobstructed, and at the same time, the unobstructed water flow will drive the brush part 522 to rotate at an appropriate speed, reducing the damage to the oyster cage 30 while cleaning the oyster cage 30.

[0100] In this embodiment, the installation rod 512 swings and collides with the oyster cage 30 under the influence of the main water flow direction, and the water flow and waves can cause the cleaning mechanism 52 to rotate, causing the brush part 522 to rub and collide with the oyster cage 30. The swinging of the installation rod 512 and the rotation of the cleaning mechanism 52 can increase the contact area between the brush part 522 and the oyster cage 30, thereby enhancing the cleaning effect of the brush part 522 on the oyster cage 30. Thus, the time interval for cleaning the oyster cage 30 on the water is extended from 1-2 months to 4-6 months, reducing the workload and cost of the oyster farmers in oyster farming, and also reducing the impact of water cleaning on the oysters.

[0101] In summary, compared with the prior art, the oyster farming method and the fish-oyster mixed farming method provided by the present application have the following beneficial effects:

[0102] (1) Compared with the prior art, the oyster cage needs to be lifted out of the water every 1-2 months for cleaning. In the present application, cleaning assemblies are arranged between adjacent oyster cages. Under the action of water flow and waves, the cleaning assemblies swing and / or rotate, thereby colliding or rubbing with the oyster cages. The deposited silt on the oyster cages is shaken off or wiped off, i.e. the organisms attached or just attached to the oyster cages are shaken off or wiped off in the early stage of attachment, thereby promoting the full exchange of water in the oyster cage with external water, so that the water in the oyster cage has sufficient nutrients and oxygen for the growth of oysters, thereby extending the time interval for cleaning the oyster cage on the water to 3-6 months.

[0103] (2) Compared with the prior art, the oyster cage needs to be lifted out of the water for cleaning one by one each time. In the present application, the oyster row is arranged as three modules that can be separated from each other: a floating row, an oyster cage, and a cage rack assembly. The cage rack can be lifted out of the sea by the boom of a work boat or connected to the main body of the floating row, thereby facilitating the cleaning of the oyster cage and the cage rack and the observation of oyster farming by the oyster farmers, reducing the time and cost of manually cleaning each oyster cage one by one. At the same time, the oyster farmers can fix or separate the oyster cage and the cage rack on the work boat or on the shore. On the one hand, harvesting and breeding oysters is more convenient and safe, and on the other hand, the time of the oyster farmers on the sea can be reduced, avoiding the influence of weather on the oyster farming process, thereby improving the safety of the working environment of the oyster farmers.

[0104] (3) By setting the lifting mechanism, the mounting rack and the cleaning mechanism are lowered and staggered with the plane where the oyster cages are located in extreme weather such as typhoon, so as to avoid damage to the mounting rack, the cleaning mechanism and the oyster cage caused by excessive collision between the mounting rack, the cleaning mechanism and the oyster cage, affect the subsequent cleaning effect and the growth state of oysters, cause economic losses and the like. Meanwhile, the cleaning assembly is fixedly connected to the floating raft assembly, and swings under the action of water flow and sea waves, so as to dissipate the energy input of wind and waves to the floating raft, thereby reducing the impact of wind and waves on the whole net cage culture system, making the floating raft keep a relatively stable state in wind and waves, and the swinging of the floating raft assembly can make the floating raft assembly more flexible to adapt to the change of wind and waves, reduce excessive stress and deformation caused by wind and waves, and help to prolong the service life of the floating raft and reduce the maintenance cost.

[0105] (4) By setting the brush part into an inverted triangular structure, a separated structure or a hollow structure, the blocking effect of the brush part on water flow is reduced, so that the water in the net cage culture system can be fully exchanged with the external water, and a better growth environment is provided for oysters. Meanwhile, the filtering or adsorption effect of the brush part on algae and other plankton is reduced, so that the oysters can contact sufficient nutrients and the growth of the oysters is promoted.

[0106] (5) By setting the free end of the brush part into a silica gel brush or other irregular shape instead of a hairbrush, the adsorption effect of the brush part on algae and other plankton is reduced, and the surface of the main body of the brush part, the mounting rod and the cleaning frame is coated with an anti-adhesion material, so as to reduce the adsorption effect of the cleaning assembly on the growth of oysters, prolong the service life of the cleaning assembly, and reduce the influence of the cleaning assembly on the growth of oysters.

[0107] (6) The oyster raft mainly adopts HDPE raw materials, has the advantages of better wear resistance, ultraviolet resistance, better elongation, corrosion resistance and high temperature resistance, etc. The connecting pipe of the support cage assembly and the support pipe of the oyster cage are reinforced pipes, which improve the strength and service life of the oyster raft, so that the oyster raft can still maintain the integrity and stability of the structure in severe sea conditions. The other parts are not reinforced, so as to reduce the weight of the oyster raft and improve the buoyancy of the oyster raft. The increase of the buoyancy helps to offset the downward pressure of wind and waves on the oyster raft, reduces the possibility of inclination, sinking or even overturning of the oyster raft, etc.

[0108] (7) The self-cleaning modular gravity type net cage culture system provided by the application is stable by anchoring assembly and its own weight, has the advantages of strong wind and wave resistance (15 level typhoon), good stability, wide application sea area, large culture capacity, high efficiency, friendly to seawater environment, long service life, easy anchoring, matching with mechanized operation and the like, and is very suitable for use in middle and far sea oyster ranch construction.

[0109] (8) By setting the width direction of the floating row assembly to the water flow, the sea waves mainly act on the width direction of the floating row assembly instead of the length direction, so as to reduce the impact area and reduce the impact of the sea waves on the floating row assembly; meanwhile, the anchor piles and cement blocks are arranged on both sides of the width direction of the floating row assembly to fix the floating row assembly, so as to reduce the influence of the sea wave impact on the stability of the floating row assembly.

[0110] (9) By setting the truss of the floating row assembly as a back-shaped structure connected by hot melting, and connecting the adjacent floating pipes together through a plurality of connecting pieces, the truss is not easy to collapse, so as to improve the stability and wind and wave resistance of the truss; by setting the corners of the truss as streamline type, the stress concentration phenomenon of the edge of the truss is reduced, so as to avoid local stress damage, and the streamline design can reduce the frictional resistance and shape resistance between the floating row assembly and the water flow, and reduce the adverse conditions such as tilting and rolling caused by the wave action; by connecting a plurality of connecting pipes to the inner side of the truss to form a stable mesh structure, and connecting a plurality of fixed pipes through the handrail column of the connecting piece to form a multi-layer rectangular frame, the stability of the truss is further enhanced, and the multi-layer rectangular frame can protect the people walking on the pedal, facilitate the operation of the breeder and the leisure fishing sightseeing of the tourists; the vertical connecting pipes on both sides of the second transverse connecting pipe are connected with the second transverse connecting pipe through a tee joint, so that the force action points of the two vertical connecting pipes on the second transverse connecting pipe are more dispersed, the stress concentration of the force points of the second transverse connecting pipe is avoided, the weight of the connecting piece is reduced by opening a through hole on the connecting piece, the buoyancy of the floating row assembly is increased, and meanwhile, the sea waves can partially pass through the through hole of the connecting piece, so as to reduce the direct impact force of the sea waves on the front of the connecting piece, thereby reducing the damage, shaking and other phenomena of the floating row assembly.

[0111] The present application is not limited to the above-described embodiments, and various modifications or changes can be made to the present application without departing from the spirit and scope of the present application, and the present application is intended to include such modifications and changes within the scope of the claims and equivalent technology.

Claims

1. A self-cleaning modular gravity type net pen aquaculture system, characterized in that, The application relates to a floating raft assembly, an anchoring assembly, a cage assembly and a cleaning assembly. The floating raft assembly comprises a truss and connecting pipes, the truss comprises floating pipes, the floating pipes are arranged in a back-shaped or back-like shape, the floating pipes are connected through hot melting, and two adjacent floating pipes are connected through a plurality of connecting pieces. The anchoring assembly comprises anchor piles, a plurality of the anchor piles are symmetrically arranged outside the floating raft assembly, and are connected to the width direction of the floating raft assembly. A plurality of oyster cages are used for oyster breeding. The cage assembly comprises a frame and a float, each frame is arranged on two adjacent floating raft units, the two ends of the frame are connected to the two ends of the two adjacent floating raft units, and a plurality of the floats are fixedly arranged below the frame. The frame of each cage assembly is arranged on the connecting pipes shared by adjacent two floating raft units, the end portions of the frame are arranged on the floating pipes and / or the connecting pipes on the two sides of the adjacent two floating raft units, and the end portions of the frame are clamped with the connecting pieces on the truss. The frame comprises at least two long pipes, at least two short pipes and a plurality of support pipes, the long pipes and the short pipes are connected to form a rectangular frame body, the two ends of the long pipes extend to the outside of the two short pipes, and the length of the long pipes is greater than the sum of the widths of the two floating raft units.

2. The self-cleaning modular gravity net pen aquaculture system of claim 1, wherein, The cleaning assembly comprises a mounting frame and a cleaning mechanism, the mounting frame is connected with the floating raft assembly, the mounting frame can swing relative to the floating raft assembly, a plurality of the cleaning mechanisms are arranged on the mounting frame, each cleaning mechanism can contact at least two adjacent oyster cages, and / or each oyster cage can contact at least one cleaning mechanism. The mounting frame comprises a hanging rope and a mounting rod, the two ends of the mounting rod are connected to the truss and / or the connecting pipes through the hanging rope, and the mounting rod is substantially parallel to the length direction or the width direction of the truss. The cleaning mechanism comprises a cleaning frame and a brush part, a plurality of the cleaning frames are arranged on the mounting rod in the length direction, the cleaning frames are connected to the mounting rod, the brush part is connected to the cleaning frame and is substantially parallel to the oyster cage, and the length of the brush part is equal to or close to the length of the oyster cage. The mounting rod and / or the brush part are rotationally connected with the cleaning frame. Each cleaning frame is arranged between two to four adjacent oyster cages, the distance between the two to four adjacent oyster cages is substantially equal, and each oyster cage is adjacent to only one cleaning frame. The end of the brush part away from the cleaning frame is in contact with the oyster cage, and the end of the brush part in contact with the oyster cage is provided in a zigzag shape, a wave shape or a plurality of silica gel bristles.

3. The self-cleaning modular gravity net pen aquaculture system of claim 1, wherein, The brush part comprises a plurality of brush heads arranged along the length direction of the cleaning frame and fixedly connected with the cleaning frame, and projections of the brush heads on a horizontal plane at least partially do not overlap.

4. The self-cleaning modular gravity net pen aquaculture system of claim 3, wherein, An included angle of projections of any two brush heads in the brush part on a horizontal plane is less than 180°.

5. The self-cleaning modular gravity net pen aquaculture system of claim 1, wherein, The main body of the brush part is made of silica gel, PTFE or graphene, or the surface of the main body of the brush part is coated with a fluororesin coating, a nano coating, a polydimethylsilane coating or PTFE.

6. The self-cleaning modular gravity net pen aquaculture system according to any one of claims 1-5, wherein, The lifting mechanism comprises a winding part, one end of the hanging rope of the cleaning assembly is fixedly connected to the winding part, and one end of the hanging rope is fixedly connected to one end of the truss away from the lifting mechanism; the winding part controls the depth of the cleaning mechanism by winding or releasing the hanging rope, so that the cleaning mechanism overlaps or is staggered with the plane where the oyster cages are located.

7. The self-cleaning modular gravity net pen aquaculture system of claim 6, wherein, The frame is provided with a plurality of floats in the area in each floating unit; and a plurality of hooks are arranged on the frame and used for connecting the hanging arms.

8. The self-cleaning modular gravity net pen aquaculture system of claim 7, wherein, The netting with an aperture smaller than that of the oyster cage is further included, and a plurality of the nettings are detachably connected to the outer sides of the plurality of oyster cages; or the netting is detachably connected to the cage rack, the floating unit or the truss and is sleeved on the outer sides of all the oyster cages on the cage rack, the floating unit or the truss.

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