A foldable lifting net cage device for marine ponds

Abstract

This invention discloses a foldable and liftable net cage device for marine ponds, belonging to the field of marine aquaculture equipment technology. Two sets of floating cage units are connected by a quick-connect mechanism and mechanically locked to form an integral floating platform. The production platform is equipped with at least two winches. The traction steel wire rope of the winch passes through the locking device and the steering wheel in sequence. The traction steel wire rope forms a closed-loop traction system through the lifting pulley group on the counterweight frame. The floating cage platform adopts a modular unit design, which supports prefabrication in shore factories and rapid assembly near the shore. Integration can be completed in ordinary ports, which greatly reduces the construction threshold. The entire structure is assembled in protected waters and towed to the target sea area as a whole, avoiding high-risk offshore operations. It retains the three-state capabilities of folding, lifting, and sinking, meeting the needs of the entire cycle of aquaculture, fish harvesting, wind shelter, and cleaning. The production platform and aquaculture net cage are designed separately, and the platform can be evacuated in extreme sea conditions, reducing the overall loss in extreme sea conditions.

Description

Technical Field

[0001] This invention relates to an aquaculture device consisting of a modular floating platform and a foldable net cage structure, and particularly to a foldable lifting net cage device for marine ponds, belonging to the field of marine aquaculture equipment technology. Background Technology

[0002] Existing deep-sea aquaculture cages mostly use integral steel structure floating platforms, which require large dry docks or heavy floating cranes for construction and launching, resulting in high initial investment and poor deployment flexibility, making it difficult to promote and apply them in remote islands or small and medium-sized ports.

[0003] Although some solutions have attempted to achieve wave-avoiding diving through ascent and descent functions, existing technologies generally suffer from the following drawbacks: 1. The rigid integration of the floating platform and the cage results in a large overall system size, and transportation and deployment still cannot escape the dependence on large port facilities; Second, even after the net cage is raised to the water surface, it is still submerged or partially submerged. The netting cannot be completely removed from the water and is difficult to dry naturally or clean manually. It is still necessary to call up a special cleaning boat or divers to work underwater, which is costly and inefficient. Third, the floating platform and the cage system were not designed in a coordinated manner, making it difficult to balance production, lifting, wind and wave resistance, and rapid deployment functions.

[0004] Therefore, there is a need for a foldable lifting net cage device for marine ponds to optimize the above-mentioned shortcomings. Summary of the Invention

[0005] The main objective of this invention is to address the key problems of existing deep-sea aquaculture equipment, such as reliance on large docks for construction, weak resistance to wind and waves, need for auxiliary platforms for operation and maintenance, and large asset losses under extreme sea conditions, by providing a foldable lifting net cage device for marine ponds.

[0006] The objective of this invention can be achieved by adopting the following technical solution: A foldable lifting net cage device for marine ponds includes a production platform and an aquaculture net cage; The production platform is assembled from at least two standardized floating box units in nearshore waters. The two sets of floating box units are connected by a quick-connect mechanism and mechanically locked to form an integral floating platform. The aquaculture cage includes a counterweight frame and a buoyancy frame. The counterweight frame is connected to the buoyancy frame by a vertical mesh, and a net is sewn between the vertical mesh and the buoyancy frame. In the folded state, the counterweight frame completely nests the buoyancy frame and lifts it to the water surface, causing the entire netting to emerge from the water. The top layer of the buoyancy frame is connected to the production platform via a flexible cable. The production platform is equipped with at least two winches. The traction wire rope of the winch passes through the locking device and the steering wheel in sequence. The traction wire rope forms a closed-loop traction system through the lifting pulley group on the counterweight frame.

[0007] Preferably, the quick-connect mechanism includes a hinge connector and a locking pin disposed between adjacent float units; The buoyancy frame is composed of at least one annular HDPE floating pipe, which is connected by vertical mesh and horizontal mesh concentric with the annular floating pipe to form a waist drum-shaped structure net box. The counterweight frame is a circular ring base frame, with its inner and outer diameters forming the support boundary. In the folded state, the counterweight frame can completely nest the buoyancy frame to support it out of the water.

[0008] Preferably, the winches are provided in at least two to four sets, and the winches are symmetrically distributed on the floating box unit along the circumferential center of the production platform. The installation position of each winch is perpendicularly aligned with the lifting pulley group on the counterweight frame, so as to coordinate the lifting and lowering movement of the aquaculture cage.

[0009] Preferably, a main mooring cable is installed on one side of the production platform and the aquaculture cage. The main mooring cable is connected to the mooring cable connector of the production platform through a quick-release connector, and the production platform can be separated from the aquaculture cage and towed away from the site.

[0010] Preferably, the mooring system comprises four mooring units evenly distributed along the circumference, each mooring unit comprising an anchor body, a Y-type tee connector, a main mooring cable, and an auxiliary mooring cable; The main mooring cable is connected to a mooring cable connector for the production platform at its upper end. The auxiliary mooring cable has a mooring connection point installed on the counterweight frame at the upper end; The main mooring cable and the auxiliary mooring cable meet at the connector and are then connected to the anchor body.

[0011] Preferably, the upper end of the auxiliary mooring cable is connected to the mooring connection point of the counterweight frame, and the auxiliary mooring cable and the main mooring cable are connected to the anchor body after they meet at the Y-type tee connector; A polyethylene mesh cover is installed inside the mooring connection point.

[0012] Preferably, the bottom edge of the polyethylene mesh is sewn 1–2 meters below the counterweight frame, and the polyethylene mesh is sewn between the radially distributed mesh strands. The counterweight frame is a circular truss structure formed by welding steel structure. Its inner side and bottom surface are sewn with polyethylene mesh, and its outer edge is provided with at least 4 mooring connection points and symmetrically distributed lifting pulley groups. The buoyancy frame is fixedly connected to the cage connector of the production platform by flexible cables; The lifting pulley block is installed in the middle section of the counterweight frame. After the lifting pulley block sinks to the bottom, the locking device on the buoy box applies a certain tension to the traction steel wire rope, which is used to limit the displacement of the buoyancy frame.

[0013] Preferably, the pontoon adopts a steel frame structure inside, and the overall density of the pontoon is controlled at 0.5–0.8 g / cm³. The top of the pontoon is provided with symmetrically distributed quick connection mechanisms, mooring cable connectors and cage connectors.

[0014] Preferably, the counterweight frame is a circular truss structure formed by welding steel structure, with polyethylene mesh sewn on its inner side and bottom surface, and at least 4 mooring connection points and symmetrically distributed lifting pulley groups on its outer circumference.

[0015] Preferably, the counterweight frame is connected to the buoyancy frame by mesh lines evenly distributed in the circumferential and axial directions, and polyethylene mesh is sewn between the mesh lines to form an aquaculture cage.

[0016] Beneficial technical effects of the present invention: This invention provides a foldable lifting net cage device for marine ponds. Breaking away from reliance on large dry docks: The floating platform adopts a modular unit design, supporting prefabrication in onshore factories and rapid assembly near the shore. Integration can be completed in ordinary ports, significantly reducing the construction threshold. Deployment is safe and efficient: The entire structure is assembled in protected waters and towed to the target sea area as a whole, avoiding high-risk maritime operations; High degree of functional integration: It retains the three-state capabilities of folding, lifting, and sinking, meeting the needs of the entire cycle of aquaculture, fish harvesting, wind shelter, and cleaning; Structural decoupling enhances reliability: The production platform and aquaculture cages are designed separately, allowing the platform to be evacuated under extreme sea conditions, thus reducing overall losses under extreme sea conditions; Suitable for large-scale deep-sea aquaculture: Modular and standardized design facilitates replication and promotion, while the steel-UHPC composite structure significantly improves wave resistance and durability, supporting the deep-sea and clustered construction of marine ranches; The floating platform is designed as a modular unit, which can be prefabricated and quickly assembled at ordinary near-shore wharves. After forming a stable platform, it can be towed to the target sea area as a whole, and is compatible with the mounting and lifting control of large gravity cages.

[0017] This model is expected to break the technical dilemma that "large net cages must rely on large docks." The platform and net cages should be able to be operated separately, enabling graded risk management under super typhoons. The net cages should be able to be folded and taken out of the water as a whole, allowing for in-situ cleaning and drying, thus eliminating dependence on auxiliary platforms. This will promote the development of deep-sea aquaculture towards low cost, high reliability, and large scale. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the lifting cage device in working state according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the lifting cage device in a folded state according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram showing the lifting cage device in a submerged state and the platform not being removed in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the lifting cage device in a specific embodiment of the present invention when it is in a submerged state and the platform is being towed away; Figure 5 The following is a cross-sectional view of the lifting cage device in a specific embodiment of the present invention, showing three states: (a) folded state, (b) working state, (c) sunken state (platform not towed away), and (d) sunken state (platform towed away). Figure 6 This is a schematic diagram of the structure of the production platform pontoon in a specific embodiment of the present invention; Figure 7 This is a schematic diagram of a wire mesh cage in a specific embodiment of the present invention; Figure 8 This is a schematic diagram of the floating platform structure in a specific embodiment of the present invention.

[0019] In the diagram: 1. Floating ring platform; 101. Floating box; 101a. Steel frame structure; 101b. High-strength concrete panel; 102. Quick connection mechanism; 102a. Hinge connector; 102b. Locking pin; 103. Mooring cable connector; 104. Fish cage connector; 105. Locking device; 106. Steering wheel; 107. Buffer pad; 2. Aquaculture cage; 201. Counterweight frame; 201a. Circular base frame; 202. Buoyancy frame; 203. Polyethylene netting; 204. Mooring connection point; 205. Lifting pulley block; 206. Netting rope; 207. Flexible cable; 3. Winch; 301. Traction wire rope; 4. Mooring system; 400. Mooring unit; 401. Anchor body; 402. Y-type tee connector; 403. Main mooring cable; 404. Auxiliary mooring cable; 405. Quick-release connector. Detailed Implementation

[0020] To enable those skilled in the art to understand the technical solution of the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0021] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 ,Figure 6 , Figure 7 and Figure 8 As shown in the figure, this embodiment provides a foldable lifting net cage device for marine ponds, including a production platform 1 and an aquaculture net cage 2; The production platform 1 is assembled from at least two standardized floating box units 101 in nearshore waters. The two sets of floating box units 101 are aligned and mechanically locked together by a quick connection mechanism 102 to form an integral floating platform. The aquaculture cage 2 includes a counterweight frame 201 and a buoyancy frame 202. The counterweight frame 201 is connected to the buoyancy frame 202 by a vertical mesh 206. A polyethylene mesh 203 is sewn between the vertical mesh 206 and the buoyancy frame 202. In the folded state, the counterweight frame 201 completely nests the buoyancy frame 202 and lifts it to the water surface, causing the polyethylene mesh 203 to emerge from the water as a whole. The top layer of the buoyancy frame 202 is connected to the production platform 1 via a flexible cable 207. The production platform 1 is equipped with at least two winches 3. The traction wire rope 301 of the winch 3 passes through the tightening device 105 and the steering wheel 106 in sequence. The traction wire rope 301 forms a closed-loop traction system through the lifting pulley group 205 on the counterweight frame 201.

[0022] The quick connection mechanism 102 includes a hinge connector 102a and a locking pin 102b disposed between adjacent float units 101; The buoyancy frame 202 is composed of at least one annular HDPE floating pipe, which is connected by vertical mesh 206 and horizontal mesh 206 concentric with the annular floating pipe to form a waist drum-shaped structure net box. The counterweight frame 201 is a circular ring base frame 201a, with its inner and outer diameters forming the support boundary. In the folded state, the counterweight frame 201 then completely nests the buoyancy frame 202 to support it out of the water.

[0023] The winches 3 are provided in at least two to four sets. The winches 3 are symmetrically distributed around the production platform 1 and circumferentially on the floating box unit 101. The installation position of each winch 3 is vertically aligned with the lifting pulley group 205 on the counterweight frame 201, which is used to coordinate the lifting and lowering movement of the aquaculture net cage 2.

[0024] A main mooring cable 403 is installed on one side of the production platform 1 and the aquaculture cage 2. The main mooring cable 403 is connected to the mooring cable connector 103 of the production platform 1 through a quick-release connector 405. The production platform 1 can be separated from the aquaculture cage 2 and towed away from the site.

[0025] Preferably, the mooring system 4 includes four mooring units 400 evenly distributed along the circumference, each mooring unit 400 including an anchor body 401, a Y-type tee connector 402, a main mooring cable 403 and an auxiliary mooring cable 404; The main mooring cable 403 is connected to a mooring cable connector 103 for the production platform 1 at its upper end. The auxiliary mooring cable 404 has a mooring connection point 204 installed on the counterweight frame 201 at the upper end. The main mooring cable 403 and the auxiliary mooring cable 404 meet at connector 402 and are then connected to the anchor body 401.

[0026] The upper end of the auxiliary mooring cable 404 is connected to the mooring connection point 204 of the counterweight frame 201. The auxiliary mooring cable 404 and the main mooring cable 403 are connected to the anchor body 401 after they meet at the Y-type tee connector 402. A polyethylene mesh 203 is installed inside the mooring connection point 204.

[0027] The bottom edge of the polyethylene mesh 203 is sewn 1–2 meters below the counterweight frame 201, and the polyethylene mesh 203 is sewn between the radially distributed mesh strands 206. The counterweight frame 201 is a circular truss structure 201a formed by welding steel structure. Its inner side and bottom surface are sewn with polyethylene mesh 203, and its outer edge is provided with at least 4 mooring connection points 204 and symmetrically distributed lifting pulley groups 205. The top annular floating pipe 202a of the buoyancy frame 202 is fixedly connected to the cage connector 104 of the production platform 1 by a flexible cable 207. The lifting pulley block 205 is installed in the middle section of the counterweight frame 201. After the lifting pulley block 205 sinks to the bottom, the locking device 105 on the float box 101 gives the traction steel wire rope 301 a certain tension. The traction steel wire rope 301 is used to limit the displacement of the buoyancy frame 202.

[0028] The pontoon 101 has a steel frame structure 101a inside. The overall density of the pontoon 101 is controlled at 0.5–0.8 g / cm³. The top of the pontoon 101 is provided with symmetrically distributed quick connection mechanisms 102, mooring cable connectors 103 and net cage connectors 104.

[0029] The counterweight frame 201 is a circular truss structure 201a formed by welding steel structure. Its inner side and bottom surface are sewn with polyethylene mesh 203, and its outer edge is provided with at least 4 mooring connection points 204 and symmetrically distributed lifting pulley groups 205.

[0030] The counterweight frame 201 is connected to the buoyancy frame 202 by nets 206 that are evenly spaced in the circumferential and axial directions, and polyethylene netting 203 is sewn between the nets 206 to form an aquaculture net cage.

[0031] like Figure 1 , Figure 2 , Figure 3 ,Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, each pontoon 101 is prefabricated in a land-based factory and adopts an internal steel frame structure 101a. The overall density is controlled at 0.5–0.8 g / cm³, giving it self-floating or near-neutral buoyancy characteristics. The top of the pontoon 101 is equipped with symmetrically distributed quick-connect mechanisms 102, mooring cable connectors 103, and net cage connectors 104. All functional components on the platform, including the quick-connect mechanisms 102, mooring cable connectors 103, net cage connectors 104, locking devices 105, steering wheels 106, and the mounting base of the winch 3, are directly fixed to the steel frame structure 101a inside the pontoon by welding or high-strength bolts. This ensures that the load is effectively transferred to the main load-bearing frame during wave impact and lifting operations, guaranteeing the safety and reliability of the overall structure. After multiple pontoons are transported to near-shore sheltered waters such as the inner basin of the breakwater, they are quickly spliced ​​into a circular platform by a quick connection mechanism 102. Buffer pads 107 are set between adjacent pontoons to absorb wave impact. This mode does not require large dry docks or heavy floating cranes, which significantly reduces the construction threshold. The aquaculture cage 2 includes a counterweight frame 201 and a buoyancy frame 202, wherein: the buoyancy frame 202 is composed of at least one concentric ring HDPE floating pipe, which is connected by circumferentially and axially equally spaced mesh 206 to form a waist drum-shaped structure cage, and polyethylene mesh 203 is sewn between the evenly distributed mesh 206. The counterweight frame 201 is a circular truss structure 201a formed by welding steel structure. Its inner side and bottom surface are sewn with polyethylene mesh 203, and its outer edge is provided with at least 4 mooring connection points 204 and symmetrically distributed lifting pulley groups 205. The counterweight frame 201 is connected to the buoyancy frame 202 by mesh 206 distributed at equal intervals in the circumferential and axial directions, and polyethylene mesh 203 is sewn between the mesh 206 to form an aquaculture net cage. The diameter of the horizontal cross section of the aquaculture net cage 2 shows a trend of increasing as the water depth decreases. The minimum diameter point appears between 1 / 2 and 2 / 3 of the draft when the platform is in operation, making it look like a waist drum in the side view. The counterweight frame 201 is a circular base frame 201a, with its inner and outer diameters forming the support boundary. In the folded state, the counterweight frame then completely nests the buoyancy frame to support it out of the water. The top annular floating pipe of the buoyancy frame 202 is fixedly connected to the cage connector 104 of the production platform 1 by a flexible cable 207. At least two diagonally opposite pontoons 101 of the production platform 1 are equipped with winches 3. The traction wire ropes 301 of each winch 3 pass sequentially through the locking device 105 and the steering wheel 106 on the pontoon 101, and then through the lifting pulley block 205 of the counterweight frame 201 to form a closed-loop traction system. This system can realize the switching between the following three working modes of the aquaculture cage: Working state: The net cage is fully deployed, the buoyancy frame floats on the water surface, and normal aquaculture is carried out; Folded state: The entire net cage is folded up, and the counterweight frame nests and supports the buoyancy frame, with all the netting exposed to the water, making it easy to collect fish or wash and dry the netting; Bottom-dwelling state: The entire net is lowered to the seabed to avoid extreme sea conditions such as typhoons.

[0032] The lifting pulley block 205 is installed in the middle section of the counterweight frame 201. After sinking to the bottom, the locking device 105 on the float box 101 gives the traction steel wire rope 301 a certain tension. The steel wire rope always remains taut to limit the displacement of the buoyancy frame 202, but the tension should not be greater than the wet mass of the counterweight frame 201. The device also includes an anchoring system 4, which comprises four anchoring units evenly distributed along the circumference. Each anchoring unit includes an anchor body 401, a Y-type tee connector 402, a main mooring cable 403, and an auxiliary mooring cable 404. The upper end of the main mooring cable 403 is connected to the mooring cable connector 103 of the production platform 1, and the upper end of the auxiliary mooring cable 404 is connected to the mooring connection point 204 of the counterweight frame 201. The main mooring cable 403 and the auxiliary mooring cable 404 meet at connector 402 and are then connected to the anchor body 401. The deployment process is as follows: Each floating box unit is prefabricated on shore → transported to nearshore sheltered waters and quickly assembled into an overall platform → towed to the target sea area → once in place, the net cage is lowered to the working depth via a winch system.

[0033] The entire process requires no structural assembly in open sea areas, ensuring high safety and adaptability, making it particularly suitable for deep-sea aquaculture projects in small and medium-sized ports and remote island areas.

[0034] Under extreme sea state warnings such as super typhoons, this device supports emergency separation operations between the production platform and the aquaculture cages: First, the connection between the main mooring cable 403 and the production platform 1 is released, and it is temporarily transferred to the mooring connection point 204 of the counterweight frame 201. Subsequently, the winch 3 releases the traction wire rope 301, causing the aquaculture cage 2 to sink to the seabed and enter a bottom-dwelling safety state. After the cage is stable, the connection between the traction wire rope 301 and the lifting pulley block 205 is released. At this time, the production platform 1 is only connected to the tugboat through the auxiliary towing cable, and the tugboat can safely evacuate to the harbor.

[0035] Because the mooring system 4 uses a Y-type tee connector 402 to share the anchor body 401, even if the main mooring cable 403 is temporarily transferred to the cage, the entire mooring unit still maintains a complete force path, ensuring that the bottom-sinking cage does not shift in strong currents.

[0036] After the disaster, the platform can return to its original position, reconnect the main mooring cable 403 to the traction system, and quickly resume aquaculture operations.

[0037] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A foldable lifting net cage device for marine ponds, comprising a production platform (1) and an aquaculture net cage (2); Its features are: The production platform (1) is assembled from at least two standardized floating box units (101) in nearshore waters. The two sets of floating box units (101) are aligned and mechanically locked together by a quick connection mechanism (102) to form an integral floating platform. The aquaculture cage (2) includes a counterweight frame (201) and a buoyancy frame (202). The counterweight frame (201) is connected to the buoyancy frame (202) by a vertical mesh (206). A mesh (203) is sewn between the vertical mesh (206) and the buoyancy frame (202). In the folded state, the counterweight frame (201) completely nests the buoyancy frame (202) and lifts it to the water surface, so that the net (203) is out of the water as a whole. The top layer of the buoyancy frame (202) is connected to the production platform (1) through a flexible cable (207). The production platform (1) is equipped with at least two winches (3). The traction wire rope (301) of the winch (3) passes through the tightening device (105) and the steering wheel (106) in sequence. The traction wire rope (301) forms a closed-loop traction system through the lifting pulley group (205) on the counterweight frame (201).

2. The foldable lifting net cage device for marine ponds according to claim 1, characterized in that: The quick-connect mechanism (102) includes a hinge connector (102a) and a locking pin (102b) disposed between adjacent float units (101). The buoyancy frame (202) is composed of at least one annular HDPE floating pipe, which is connected by vertical mesh (206) and horizontal mesh (206) concentric with the annular floating pipe to form a waist drum-shaped structure net box. The counterweight frame (201) is a circular ring base frame (201a), which is connected by its inner and outer diameters to form a support boundary. In the folded state, the counterweight frame (201) will then completely nest the buoyancy frame (202) to support it out of the water.

3. The foldable lifting net cage device for marine ponds according to claim 2, characterized in that: The winch (3) is provided with at least two to four sets. The winches (3) are symmetrically distributed around the production platform (1) on the floating box unit (101). The installation position of each winch (3) is vertically aligned with the lifting pulley group (205) on the counterweight frame (201) to coordinate the lifting and lowering movement of the aquaculture cage (2).

4. A foldable lifting net cage device for marine ponds according to claim 3, characterized in that: The production platform (1) and the aquaculture cage (2) are equipped with a main mooring cable (403) on one side. The main mooring cable (403) is connected to the mooring cable connector (103) of the production platform (1) through a quick-release connector (405). The production platform (1) can be separated from the aquaculture cage (2) and towed away from the site.

5. A foldable lifting net cage device for marine ponds according to claim 4, characterized in that: The mooring system (4) includes four mooring units (400) evenly distributed along the circumference. Each mooring unit (400) includes an anchor body (401), a Y-type tee connector (402), a main mooring cable (403), and an auxiliary mooring cable (404). The main mooring cable (403) is connected to a mooring cable connector (103) for the production platform (1) at its upper end. The auxiliary mooring cable (404) has a mooring connection point (204) installed on the counterweight frame (201) at the upper end. The main mooring cable (403) and the auxiliary mooring cable (404) meet at the connector (402) and are then connected together to the anchor body (401).

6. A foldable lifting net cage device for marine ponds according to claim 5, characterized in that: The upper end of the auxiliary mooring cable (404) is connected to the mooring connection point (204) of the counterweight frame (201). The auxiliary mooring cable (404) and the main mooring cable (403) are connected to the anchor body (401) after they meet at the Y-type tee connector (402). A polyethylene mesh (203) is installed inside the mooring connection point (204).

7. A foldable lifting net cage device for marine ponds according to claim 6, characterized in that: The bottom edge of the polyethylene mesh (203) is sewn 1–2 meters below the counterweight frame (201), and the polyethylene mesh (203) is sewn between the radially distributed mesh (206). The counterweight frame (201) is a circular truss structure (201a) formed by welding steel structure, with polyethylene mesh (203) sewn on its inner side and bottom surface, and at least 4 mooring connection points (204) and symmetrically distributed lifting pulley groups (205) on its outer edge. The buoyancy frame (202) is fixedly connected to the cage connector (104) of the production platform (1) by a flexible cable (207); The lifting pulley block (205) is installed in the middle section of the counterweight frame (201). After the lifting pulley block (205) sinks to the bottom, the locking device (105) on the float box (101) gives the traction steel wire rope (301) a certain tension. The traction steel wire rope (301) is used to limit the displacement of the buoyancy frame (202).

8. A foldable lifting net cage device for marine ponds according to claim 7, characterized in that: The pontoon (101) is internally constructed with a steel frame structure (101a). The overall density of the pontoon (101) is controlled at 0.5–0.8 g / cm³. The top of the pontoon (101) is provided with symmetrically distributed quick connection mechanisms (102), mooring cable connectors (103), and net cage connectors (104).

9. A foldable lifting net cage device for marine ponds according to claim 8, characterized in that: The counterweight frame (201) is a circular truss structure (201a) formed by welding steel structure. Its inner side and bottom surface are sewn with polyethylene mesh (203), and its outer edge is provided with at least 4 mooring connection points (204) and symmetrically distributed lifting pulley groups (205).

10. A foldable lifting net cage device for marine ponds according to claim 9, characterized in that: The counterweight frame (201) is connected to the buoyancy frame (202) by nets (206) that are evenly spaced in the circumferential and axial directions, and polyethylene netting (203) is sewn between the nets (206) to form an aquaculture cage.

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