Reducing float type deep sea aquaculture net cage with similar biological joint connecting structure

Abstract

The invention relates to the technical field of deep sea steel truss type net cage structures, in particular to a variable-diameter float type deep sea aquaculture net cage with a similar biological joint connecting structure. Each variable-diameter buoy is connected to the vertex of the polygonal net cage unit, the diameter of the lower portion of each variable-diameter buoy is larger than that of the upper portion of the variable-diameter buoy, the bottom end of the lower portion of each variable-diameter buoy is connected with the end of an anchor chain through a chain locker, and the other end of the anchor chain is connected with a gravity anchor. At least three polygonal net cage units are arranged in a circumferential mode, at least one floating cross beam is connected between every two adjacent polygonal net cage units, and the two ends of each floating cross beam are connected with the corresponding variable-diameter floating pontoons at the ends of the floating cross beam through the corresponding biological-like joints respectively. The design mode that the diameter of the variable-diameter buoy is small in the upper portion and large in the lower portion reduces the stress area of the waterline face of the component, the impact strength of wave loads on the structure is remarkably reduced, and the wave stability in the deep sea environment is improved.

Description

Technical Field

[0001] This invention relates to the field of deep-sea steel truss cage structure technology, and particularly to a variable-diameter floating deep-sea aquaculture cage with a biological joint-like connection structure. Background Technology

[0002] Deep-sea aquaculture is a key focus of current marine fisheries development. Therefore, deep-sea aquaculture cages are an indispensable and crucial component of the aquaculture industry. The role of deep-sea aquaculture cages is to extend fisheries activities from nearshore to the deep sea, utilizing the superior ecological environment of the deep sea to achieve high-quality and high-efficiency seafood farming. Specifically, this manifests in: 1. Utilizing the fast currents and good water exchange in the deep sea to reduce diseases and pollution, thereby improving fish quality. 2. Expanding aquaculture space and alleviating environmental pressure on nearshore areas. 3. Equipped with modern equipment, enabling intelligent management and promoting the modernization of fisheries. Currently, large-scale, clustered steel truss cages have become the mainstream.

[0003] However, in order to cope with the severe wave loads in the deep sea, the existing technologies mainly focus on steel truss cages and HDPE flexible cages. The industry also generally adopts two approaches: increasing structural stiffness (strong resistance) or utilizing material elasticity (energy dissipation). However, when anchored in deep water, traditional mechanisms have poor stability under extreme sea conditions, and are prone to stress concentration at component connections after being affected by waves, leading to a series of serious problems. Summary of the Invention

[0004] This invention provides a variable-diameter floating deep-sea aquaculture cage with a biological joint-like connection structure to solve the problems mentioned in the background art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a variable-diameter floating pontoon deep-sea aquaculture cage with a biological joint-like connection structure, comprising: at least three polygonal cage units, wherein the polygonal cage units are floating truss structures; Multiple variable-diameter pontoons, each of which is connected to the vertex of a polygonal gabion unit, and the lower diameter of the variable-diameter pontoon is set to be larger than the upper diameter. The lower bottom of the variable-diameter pontoon is connected to the end of the anchor chain through an anchor chain cabin, and the other end of the anchor chain is connected to a gravity anchor. Multiple floating beams and multiple bio-like joints are provided. At least three of the polygonal cage units are arranged in a circular pattern. At least one floating beam connects adjacent polygonal cage units. The two ends of each floating beam are connected to a variable-diameter float corresponding to the end of the floating beam through a bio-like joint.

[0006] Preferably, the bio-joint restricts the floating beam to deflect within ±5°.

[0007] Preferably, the bio-joint includes: a ball head, a ball seat, and a return spring. The end of the floating beam is connected to the ball head, which is rotatably engaged with the end of the ball seat. The other end of the ball seat is connected to the side wall of the variable-diameter float. The end of the ball seat is connected to the end of the return spring, and the other end of the return spring is connected to the floating beam.

[0008] Preferably, the polygonal wire mesh unit is a regular pentagon.

[0009] Preferably, the length of the floating truss in the polygonal wire mesh unit is 52-65m.

[0010] Preferably, the lower and upper parts of the variable-diameter pontoon are welded together via a conical transition section.

[0011] Preferably, the slope of the conical transition section is 1:3.

[0012] Preferably, the lower diameter of the variable-diameter pontoon is 4.5-6m, and the upper diameter of the variable-diameter pontoon is 2.2-2.8m.

[0013] Preferably, the anchor chain has an R4 strength and a predetermined tension of 495-505 kN.

[0014] Preferably, the gravity anchor is a 100-ton concrete block or a 30-ton high-grip barbed anchor.

[0015] The beneficial effects of this invention are as follows: In the solution of this invention: 1. Under the premise of maintaining the total buoyancy constant, the design of the variable diameter float with a smaller diameter at the top and a larger diameter at the bottom reduces the stress area at the waterline of the component, significantly reduces the impact strength of wave load on the structure, and improves wave stability in deep-sea environment; 2. The mechanism uses bio-like joints to connect the polygonal mesh cage units to the floating crossbeams, transforming "rigid resistance" into "flexible buffering," avoiding the material from entering the plastic deformation stage, and eliminating the stress concentration problem at the welded joints of traditional mechanism components; 3. Compared with modular cages with non-constrained connections, the polygonal cage units and floating beams arranged in a circular array in this technical solution eliminate frequent collisions and entanglements between modules, forming a nested continuous space of polygonal water body 1 and polygonal water body 2. This not only constructs a continuous large water body aquaculture space with all-round wave resistance, but also solves the problem of collision between aquaculture modules. 4. Our technical solution successfully resolves the contradiction between rigidity and flexible energy dissipation in traditional deep-sea cage structures. Its core advantages lie in reducing environmental load sources by using variable-diameter pontoons, solving the persistent problem of node fatigue fracture by using bio-like joints, and restricting structural movement to a very small range by utilizing the geometric characteristics of ultra-long floating truss structures. This results in a highly stable, long-life, and large-space continuous aquaculture environment in deep waters above 50m. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram showing the connection relationship between the variable-diameter pontoon and the floating truss in the polygonal cage unit of the present invention, as well as the connection relationship between the bottom of the variable-diameter pontoon and the anchor chain; Figure 3 For the present invention Figure 1 Schematic diagram of the connection relationship between the floating crossbeam, the biological joint, and the variable-diameter float in direction A; Figure 4 This is a schematic diagram of the bio-joint structure of the present invention; Figure 5 This is a schematic diagram of the working state of the bio-joint of the present invention in buffering wave impact in seawater.

[0017] Among them: polygonal cage unit 1, variable diameter float 2, floating crossbeam 3, biological joint 4, ball head 41, ball seat 42, and return spring 43. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A variable-diameter floating deep-sea aquaculture cage with a biological joint-like connection structure includes: at least three polygonal cage units 1, wherein the polygonal cage unit 1 is a floating truss structure; Multiple variable diameter pontoons 2, each of which is connected to the vertex of the polygonal cage unit 1, and the lower diameter of the variable diameter pontoon 2 is set to be larger than the upper diameter. The lower bottom of the variable diameter pontoon 2 is connected to the end of the anchor chain through the anchor chain cabin, and the other end of the anchor chain is connected to the gravity anchor. Multiple floating beams 3 and multiple bio-like joints 4, at least three of the polygonal cage units 1 are arranged in a circular pattern, and at least one floating beam 3 is connected between adjacent polygonal cage units 1. The two ends of the floating beam 3 are respectively connected to a variable diameter float 2 corresponding to the end of the floating beam 3 through a bio-like joint 4.

[0020] The principles and beneficial effects of the above scheme are as follows: The polygonal net cage unit 1 within the facility is specifically composed of buoyant trusses connected end-to-end in seawater. These buoyant trusses are specifically ultra-long floating trusses. Experiments show that when the floating truss length L = 52m, facing extreme sea conditions with a wave height of H = 10m, even if adjacent variable-diameter floats 2 are at extreme positional differences between wave crests and troughs, with a maximum tilt angle θ ≈ arcsin10 / 52 ≈ 11°, the actual structural deformation can still be constrained within ±5° under the limiting effect of the bio-joint 4. This ensures the continuity of the aquaculture water body, i.e., the polygonal net cage unit 1. The ultra-long floating truss sides of the polygonal net cage unit 1... The structure is equipped with deep-sea aquaculture netting suspended or connected to the perimeter for marine aquaculture. The ultra-long floating truss, made of Q355B seamless steel pipe (52m long, 1.2m diameter, 25mm wall thickness), possesses excellent mechanical strength. Multiple variable-diameter floats 2 are installed within the structure, connected to the vertices of the polygonal net cage unit 1 and positioned perpendicular to the horizontal plane to provide buoyancy for the polygonal net cage 1's floating in seawater. Because deep-sea aquaculture requires a large number of automated feeding, monitoring, and harvesting devices, the variable-diameter floats 2 are designed with a smaller upper diameter and a larger lower diameter, with the larger diameter portion submerged underwater, based on formula F... buoyancy =ρgV lower It can be seen that the lower part of the variable-diameter pontoon 2 is used to provide static buoyancy. The huge static buoyancy can support heavy steel trusses and aquaculture equipment. The thinner upper part reduces the impact force of waves on the waterline, and at the same time, its upper part can reduce the disturbance force generated by the movement of water particles in the waves. Based on the waterline area A w The decrease, combined with the heave motion equation M+m +N +ρgA w z=F wave It can be seen that the smaller A wThis design significantly reduces wave excitation, enabling the cage to maintain stability and reduce heave in complex deep-sea currents. The lowered center of gravity and ample buoyancy provide robust support for the upper truss and management platform, meeting the high-load requirements of deep-sea industrial aquaculture. The bottom of the variable-diameter pontoon 2 is connected to the end of the anchor chain via an anchor chain locker, and the other end of the anchor chain is connected to a gravity anchor. The gravity anchor is anchored to the seabed to increase the stability of the structure in seawater. In deep waters exceeding 50m, traditional fixed platforms are extremely costly. The technical solution in this application provides a floating structure that can adapt to deep water while maintaining stable fixation. Anchored to the seabed by a gravity anchor, it better adapts to the complex anchoring stress environment in deep water areas. In deep waters above 50m, this floating design offers higher economic efficiency and environmental adaptability compared to fixed structures. Multiple circumferentially arranged... The polygonal net cage unit 1 is connected in series by floating beams 3. The end of the floating beam 3 is connected to a corresponding variable-diameter float 2 through a bio-like joint 4. The polygonal net cage unit 1, in this way, forms a stable "polygonal water body" cluster, which not only expands the aquaculture space, but also enhances the risk resistance of the structure in seawater by utilizing the integrity of the circumferential structure. On the basis of expanding the aquaculture scale, and in the case of the variable direction of deep sea currents and waves, the net cage has all-round wave resistance. The setting of the bio-like joint 4 solves the problem that traditional rigid aquaculture net cages are prone to structural fracture, overturning or metal fatigue damage under the impact of typhoons or extreme waves, such as 10m waves. Moreover, the polygonal net cage unit 1, connected to the floating beam 3 through the bio-like joint 4, has excellent deformation compensation ability in seawater. Specifically, while maintaining the total buoyancy constant, the design of the variable diameter float 2 with a smaller diameter at the top and a larger diameter at the bottom reduces the stress area at the waterline of the component, significantly reduces the impact strength of wave load on the structure, and improves wave stability in the deep sea environment. Furthermore, the mechanism uses a bio-like joint 4 to connect the polygonal mesh cage unit 1 to the floating crossbeam 3, transforming "rigid resistance" into "flexible buffering," avoiding the material from entering the plastic deformation stage, and eliminating the stress concentration problem at the welding nodes of traditional mechanism components. Furthermore, compared to modular cages with non-constrained connections, the polygonal cage units 1 and floating beams 3 arranged in a circular array in this technical solution eliminate frequent collisions and entanglements between modules, forming a nested continuous space of polygonal water bodies 1 and polygonal water bodies 2. This not only constructs a continuous large-scale aquaculture space with all-round wave resistance capabilities, but also solves the problem of collision between aquaculture modules. Therefore, our technical solution successfully resolved the contradiction between rigidity and flexible energy dissipation in traditional deep-sea cage structures. Its core advantage lies in using variable-diameter floats 2 to reduce environmental load sources, using bio-like joints 4 to solve the persistent problem of node fatigue fracture, and using the geometric characteristics of ultra-long floating truss structures to restrict structural movement to a very small range, thereby achieving a highly stable, long-life, and large-space continuous aquaculture environment in deep waters above 50m.

[0021] Example 2: Reference Figure 3 , Figure 4 and Figure 5 Based on Example 1, in order to further improve the adaptability of the mechanism under extreme sea conditions, the bio-like joint 4 is specifically made to restrict the floating beam 3 to deflect within ±5° to prevent the structure from undergoing excessive deformation or instability. Furthermore, the bio-like joint 4 includes a ball head 41, a ball seat 42, and a return spring 43. The end of the floating beam 3 is connected to the ball head 41. When waves impact the polygonal net cage unit 1 within the mechanism, the ball head 41 rotates in conjunction with the end of the ball seat 42. The ball head 41 is used to simulate the joint head, eliminating the stress concentration of bending moment at the nodes within the mechanism. It is made of 40CrMo alloy steel with a chrome-plated surface. The diameter of the ball head is 800mm, and the diameter of the handle connected to the end of the floating beam 3 is 400mm. The ball seat 42 is used to simulate the joint socket, and its inner lining is a self-lubricating composite material, bearing the axial pressure and shear force transmitted from the floating beam 3. The ball seat 42 is made of Q355B steel shell with an outer diameter of 1000mm and an inner diameter of 802mm. Its surface is lined with a self-lubricating composite material. The inner lining is made of polytetrafluoroethylene (PTFE). Since the other end of the ball seat 42 is connected to the side wall of the variable-diameter float 2, and the end of the ball seat 42 is connected to the end of the return spring 43, the floating beam 3 rotates around the ball head 41. The other end of the return spring 43 is connected to the floating beam 3. The return spring 43 is used to simulate biological ligaments, providing a restoring torque M=KΔθ, which allows the beam to automatically return to the horizontal reference position after the waves. It is made of 60Si2Mn spring steel with an anti-corrosion coating to withstand the corrosive marine environment. Its torsional stiffness coefficient is k=500kN·m / rad. It is installed circumferentially on the ball seat 42. Simultaneously, since the floating beam 3 deflects within ±5°, the return spring 43 deforms when impacted by waves. Furthermore, according to Hooke's Law, E... p = kΔθ 2 The return spring 43 generates a reverse force, converting kinetic energy into elastic potential energy. After the wave crest passes, the return spring 43 restores its deformation and releases energy, driving the floating beam 3 to reset. The return spring 43 converts the impact energy under extreme sea conditions into the elastic potential energy of the spring, avoiding the material from entering the plastic deformation stage, and further avoiding the phenomenon of fatigue fracture caused by the inability to displace rigid nodes in traditional mechanisms. The bio-like joint 4 can solve the problems of stress concentration and fatigue damage at the connection points of existing mechanisms and easy breakage due to rigid impact in polygonal mesh cage unit 1. Combined with the ultra-long floating truss within polygonal mesh cage unit 1, it can spread out the wave phase difference and reduce the rotation angle θ = arctan(H). wave / L beam Even in 10-meter waves, the angle between the crossbeam and the horizontal plane can be controlled within ±5 degrees, which greatly reduces structural stress concentration and ensures the overall safety of the cage under extreme weather conditions.

[0022] Example 3: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Based on the circular arrangement of multiple polygonal cage units 1, the mechanism can cope with the impact of wind and waves from any direction. The foremost polygonal cage unit 1 breaks through the waves and diverts the flow, while the impact force of the rear polygonal cage unit 1 is significantly reduced, and the stability is significantly increased. Furthermore, it is preferable to set the polygonal cage unit 1 as a regular pentagon, which improves the wave-breaking and impact resistance capability of the mechanism. With the multiple polygonal cage units 1 arranged in a circular shape, the purpose of effectively reducing the impact of wind and waves and dispersing the impact can be achieved.

[0023] The preferred technical solution of this application is that the length of the floating truss in the polygonal cage unit 1 is 52-65m. The ultra-long floating truss, together with the biological joint 4, brings excellent deformation compensation capability to the mechanism, enabling it to better adapt to the complex anchoring stress environment in deep water areas. In deep water areas above 50m, this floating design has higher economy and environmental adaptability compared to the fixed structure. Based on existing data, it is known that the average depth of the nearshore waters such as the Beibu Gulf in the South my country Sea is 50-60m, while the depth of the deep sea can reach more than 60m or 80m. Therefore, different sea areas face different sea conditions under extreme weather conditions. When the mechanism is set up in the nearshore, in order to improve the mechanism's ability to cross wavelengths and balance wave forces, the preferred floating truss length is 52m. When the mechanism is set up in the open sea, the preferred floating truss length is 65m to improve the mechanism's adaptability to sea waves. Furthermore, since the ultra-long floating truss works in conjunction with the bio-joint 4, it provides the mechanism with excellent deformation compensation capability. Therefore, the linear stiffness of the return spring 43 in the bio-joint 4 is preferably 500kN / m. Combined with the torsional stiffness coefficient of the return spring 43, it can be seen that the return spring 43 can not only provide sufficient torsional return torque but also provide sufficient tensile return torque, thus enabling the mechanism to absorb 5-meter wave energy.

[0024] Example 4: Reference Figure 2 , Figure 3, Figure 4 and Figure 5 Based on Embodiment 3, it is known that the mechanism can be used in sea areas with a depth of more than 50 meters. Therefore, the lower and upper parts of the variable diameter float 2 are welded through a conical transition section. During welding, an automatic submerged arc welding machine is used. After welding, the weld is subjected to 100% ultrasonic testing (UT) to ensure that there are no pores or slag inclusions. The variable diameter pontoon 2 is made of Q355ND marine engineering steel. After manufacturing, the yield strength of the variable diameter pontoon 2 is ≥335MPa. Therefore, the variable diameter pontoon 2 has excellent corrosion resistance and impact resistance in the ocean. The slope of the conical transition section is 1:3. The lower diameter of the variable diameter pontoon 2 is 4.5-6m, and the upper diameter of the variable diameter pontoon 2 is 2.2-2.8m. The waterline area of ​​the upper part of the variable diameter pontoon 2 is reduced by 51% compared with the straight cylinder structure of the same displacement, and the wave force Fw is significantly reduced. At the same time, the return spring 43 can realize the automatic reset of the structure within 30 seconds after the wave passes. Furthermore, the total length of the variable-diameter pontoon 2 is 15m, with the lower part being 10m long and the upper part being 5m long; When the lower diameter of the variable-diameter pontoon 2 is preferably 4.5m, it can not only provide core buoyancy support, but also ensure the drainage of the net cage. When the lower diameter is preferably 6m, the overall buoyancy of the mechanism is improved, so the mechanism can meet the heavy load requirements of deep-sea aquaculture. When the upper diameter of the variable-diameter pontoon 2 is preferably 2.2m, it can not only reduce the waterline area, but also reduce wave sensitivity. When the upper diameter is preferably 2.8m, the heave response of the mechanism can be further reduced in extreme sea conditions in the deep sea. Meanwhile, in this application, the number of bio-like joints 4 connected to the variable diameter float 2 in its axial direction is not limited, and the number of floating beams 3 is not specifically limited. The number of floating beams 3 can be selected based on the current sea area where the mechanism is located and the maximum waves under historical extreme sea conditions as a reference. When the historical wave height is greater and the impact is greater, the number of floating beams 3 and bio-like joints 4 installed is more, and vice versa, the number of floating beams 3 and bio-like joints 4 is reduced to improve the adaptability of the mechanism in actual use. As shown in Example 3, in nearshore areas such as the Beibu Gulf in the South China Sea, the maximum swing angle of the ultra-long floating truss relative to the horizontal plane is ±3.2° under 8-meter wave height, and the maximum stress value at node 41 of the ball head is 195MPa, which is about 55% of the expected effect of the allowable stress of steel. In deep-sea areas at depths of 60m or 80m or more, under the impact of 12-meter giant waves, the overall structural deformation rate of the polygonal cage unit 1 is less than 0.5%, and the relative displacement change rate between modules is reduced by 75% compared with traditional rigid connections. Through micro-controlled movement within ±5°, about 40% of the wave energy is successfully dissipated. The variable diameter design controls the heave amplitude within ±0.8m, ensuring the expected effect of continuity of the aquaculture water.

[0025] Example 5: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The anchor chain has an R4 strength rating, and its core mechanical performance requirements are: tensile strength ≥ 860 MPa, yield strength ≥ 580 MPa, and a pre-tension of 495-505 kN. Anchor chains with different pre-tensions can be selected based on the seabed depth within the sea area. Further, based on the appendix to the instruction manual... Figure 2 As can be seen, in order to improve the stability of the mechanism in the sea area, the technical solution can also connect anchor chains to the side wall of the variable diameter buoy 2 to further increase stability.

[0026] Example 6: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Preferably, the gravity anchor is a 100-ton concrete block or a 30-ton high-holding-force barbed anchor. Specifically, when the seabed conditions are relatively good, that is, when the seabed topography is relatively flat, a 100-ton concrete block is selected to anchor the mechanism. When the seabed topography is more complex, a 30-ton high-holding-force barbed anchor is selected to anchor the mechanism. Ultimately, this can improve the adaptability of the mechanism under different seabed conditions and reduce anchoring costs.

[0027] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A variable-diameter floating deep-sea aquaculture cage with a biological joint-like connection structure, characterized in that, include: At least three polygonal mesh cage units (1), wherein the polygonal mesh cage unit (1) is a floating truss structure; Multiple variable diameter pontoons (2), each of the variable diameter pontoons (2) is connected to the vertex of the polygonal net cage unit (1), and the lower diameter of the variable diameter pontoon (2) is set to be larger than the upper diameter. The lower bottom of the variable diameter pontoon (2) is connected to the end of the anchor chain through the anchor chain cabin, and the other end of the anchor chain is connected to the gravity anchor. Multiple floating beams (3) and multiple bio-like joints (4), at least three of the polygonal cage units (1) are arranged in a circular pattern, and at least one floating beam (3) is connected between adjacent polygonal cage units (1). The two ends of the floating beam (3) are respectively connected to a variable diameter float (2) corresponding to the end of the floating beam (3) through a bio-like joint (4).

2. The variable-diameter floating deep-sea aquaculture cage with a biological joint-like connection structure according to claim 1, characterized in that, The bio-joint (4) restricts the floating beam (3) from deflecting within ±5°.

3. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure according to claim 2, characterized in that, The bio-joint (4) includes a ball head (41), a ball seat (42), and a return spring (43). The end of the floating beam (3) is connected to the ball head (41), which is rotatably engaged with the end of the ball seat (42). The other end of the ball seat (42) is connected to the side wall of the variable diameter float (2), and the end of the ball seat (42) is connected to the end of the return spring (43). The other end of the return spring (43) is connected to the floating beam (3).

4. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure as described in claim 1, characterized in that, The polygonal mesh cage unit (1) is a regular pentagon.

5. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure according to claim 4, characterized in that, The length of the floating truss in the polygonal mesh cage unit (1) is 52-65m.

6. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure according to claim 1, characterized in that, The lower and upper parts of the variable diameter pontoon (2) are welded together via a conical transition section.

7. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure according to claim 6, characterized in that, The slope of the conical transition section is 1:

3.

8. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure according to claim 7, characterized in that, The lower diameter of the variable diameter pontoon (2) is 4.5-6m, and the upper diameter of the variable diameter pontoon (2) is 2.2-2.8m.

9. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure according to claim 1, characterized in that, The anchor chain has a strength of R4 grade and a predetermined tension of 495-505kN.

10. A variable-diameter floating deep-sea aquaculture cage with a bio-joint-like connection structure according to claim 1, characterized in that, The gravity anchor is a 100-ton concrete block or a 30-ton high-holding-force barbed anchor.

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