Aquaculture net cage and floating method thereof

Abstract

The invention relates to an aquaculture net cage and a floating method thereof. The aquaculture net cage comprises a net cage body, a main lifting device and a segmented lifting device. The main lifting device comprises a main air bag and a first air pipe, the main air bag is connected to the top end of the net cage body, one end of the first air pipe communicates with the main air bag, and the other end of the first air pipe extends to the sea surface and is provided with a first valve. The segmented lifting device comprises a plurality of sets of segmented lifting mechanisms, and the segmented lifting mechanisms are arranged around the net cage body; the segmented lifting mechanism comprises an anchor block, a connecting rope, a counterweight, an auxiliary airbag and a second air pipe, one end of the connecting rope is connected with the bottom of the net cage body, and the other end of the connecting rope is connected with the anchor block; the counter weight and the auxiliary air bag are connected with the middle section of the connecting rope; one end of the second air pipe communicates with the auxiliary air bag, and the other end of the second air pipe extends to the sea surface and is provided with a second valve. According to the invention, sectional floating of the culture net cage can be realized, so that a culture object is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture, and particularly relates to a culture cage and a method for floating it up. Background Art

[0002] A culture cage is a tool for deep - sea aquaculture, mainly composed of a frame system, a net bag, a fixing system and supporting facilities. It uses the interaction of a fixed platform and the characteristics of the box body to lower the box body to a limited depth underwater, so it has strong anti - wind and wave capabilities. In addition, the culture cage also has the advantages of a long service life, a large effective aquaculture water body, high efficiency, low comprehensive cost, low pollution, excellent water quality, low fish mortality, and good fish product quality.

[0003] When it is necessary to grade the cultured fish, observe the growth situation, and catch them, etc., it is necessary to float the culture cage to the sea surface. Therefore, most culture cages are set as lift - type. Currently, the most commonly used lifting method is pneumatic lifting, that is, by inflating and draining water or exhausting air and filling water in the buoyancy tank of the frame to achieve the lifting of the culture cage. However, due to the long - term presence of the culture cage at the seabed, there is silt at the seabed bottom, etc., which will generate an adsorption force on the cage. When lifting, the buoyancy provided needs to be greater than the self - weight of the cage plus the adsorption force, so that the culture cage can break away from the silt adsorption and start to rise. Once it starts to rise, the adsorption force of the silt on the culture cage disappears, and the buoyancy is much greater than the gravity of the culture cage, and the rising speed is extremely fast. This will cause the aquaculture objects (fish) that have been in deep water for a long time to be unable to adapt to the rapid change of water pressure, resulting in problems such as swim bladder inflation, swim bladder expulsion, and death. In addition, the rapidly rising cage is also likely to cause collisions between cultured fish, and the impact force on the cage structure is relatively large, posing a safety hazard. Summary of the Invention

[0004] The purpose of the present invention is to provide a culture cage and a method for floating it up, which can realize the segmented floating of the culture cage, so as to play a protective role for the aquaculture objects.

[0005] To achieve the above - mentioned purpose, the present invention discloses a culture cage, which includes: a cage body, a main lifting device and a segmented lifting device; The main lifting device includes a main airbag and a first air pipe. The main airbag is connected to the top of the cage body and surrounds the outer periphery of the cage body. One end of the first air pipe is communicated with the main airbag, the other end of the first air pipe extends to the sea surface, and a first valve is provided at the end of the first air pipe extending to the sea surface; The segmented lifting device includes a number of segmented lifting mechanisms, which are arranged around the main body of the cage; each segmented lifting mechanism includes an anchor block, a connecting rope, at least one counterweight, at least one auxiliary airbag and at least one second air pipe. One end of the connecting rope is connected to the bottom of the main body of the cage, and the other end of the connecting rope is connected to the anchor block; the counterweight is connected to the middle section of the connecting rope, and the counterweights are arranged at intervals on the connecting rope; the auxiliary airbags correspond to the counterweights one by one, or the auxiliary airbags are arranged corresponding to the counterweights closest to the cage body on the connecting rope, and the auxiliary airbags are connected to the counterweights or the connecting rope; each second air pipe corresponds to at least one auxiliary airbag, one end of the second air pipe is communicated with the auxiliary airbag, the other end of the second air pipe extends to the sea surface, and a second valve is arranged at the end of the second air pipe extending to the sea surface.

[0006] Preferably, the maximum buoyancy of the auxiliary airbag is not less than the gravity of the corresponding counterweight; the sum of the gravity of the cage body and the acting force of the seabed on the cage body is less than the maximum buoyancy of the main airbag; define the counterweight closest to the cage body in each segmented lifting mechanism as the first counterweight, then the sum of the gravity of the cage body and the gravity of all the first counterweights is greater than the maximum buoyancy of the main airbag. Such a setting is to ensure the smooth realization of segmented floating.

[0007] Preferably, it further includes a protection frame corresponding to the auxiliary airbag one by one, and the auxiliary airbag is placed in the protection frame. By setting the protection frame, it is possible to avoid damage such as scratches and abrasions to the auxiliary airbag caused by hard objects on the seabed (such as reefs, etc.).

[0008] Preferably, the cage body includes a frame and a composite netting, and the composite netting is connected to the frame; the composite netting is formed by splicing a first netting and a second netting, wherein the first netting is a netting with an anti-fouling function. By locally setting the composite netting as a netting with an anti-fouling function, it is possible to prevent fouling organisms from attaching, ensure that the mesh holes on the first netting are not blocked, and further ensure that the water body inside the cage can exchange with the outside world, guaranteeing aquaculture safety.

[0009] Preferably, the area of the first netting accounts for 30-70% of the total area of the composite netting. The netting with an anti-fouling function is generally more expensive, and such a setting is to balance the cost and the requirements of the aquaculture water body.

[0010] Preferably, it further includes a feeding device, which includes a floating body, a pulling rope, a limiting guiding rope and an elastic folding channel. There is a feeding inlet at the top of the net cage body; the bottom of the elastic folding channel is connected to the culture net cage, and the elastic folding channel is communicated with the feeding inlet of the culture net cage; the top of the elastic folding channel is connected to the floating body through the pulling rope; one end of the limiting guiding rope is connected to the floating body, and the other end of the limiting guiding rope is connected to the culture net cage, and the elastic folding channel is slidably connected relative to the limiting guiding rope. By setting the limiting guiding rope, it can ensure that the floating body stays in a certain area on the sea surface above the culture net cage, thus avoiding the floating body pulling the pulling rope under the action of the sea current, ensuring that the elastic folding channel maintains the folded and stored state. In addition, when the elastic folding channel is in the stretched state, the limiting guiding rope can prevent the elastic folding channel from being overly deformed under the action of the sea current to a certain extent, affecting the feeding of bait. By setting the floating body, it can ensure that the operator can touch the pulling rope on the sea surface. The operator pulls the pulling rope on the sea surface to unfold the elastic folding channel and extend it to the sea surface. At this time, sinking bait can be put in, and the operation is convenient. After the feeding is over, tie the top of the elastic folding channel and then release the pulling rope. The elastic folding channel retracts to the position of the culture net cage for storage under its own elastic force. The elastic folding channel in the storage state is less affected by the sea current and is less likely to be damaged by the wind, waves and sea current, and its service life can be extended.

[0011] Preferably, the elastic folding channel includes a net cylinder, a plurality of connecting rings and a plurality of first elastic members. The net cylinder is made of flexible netting; the connecting rings are arranged at intervals along the length direction of the net cylinder, and the net cylinder is connected to the connecting rings; two adjacent connecting rings are connected by at least one first elastic member. After such a setting, by using a flexible net with fine mesh holes to support the net cylinder, it can not only prevent bait leakage but also reduce the force of the sea current on the net cylinder. The setting of the connecting rings can ensure that the inner cavity of the net cylinder opens when it is in the extended state, which is beneficial to the sinking of bait. The first elastic members connect two adjacent connecting rings, and the elastic force does not directly act on the net cylinder, and the net cylinder is less likely to be damaged, thereby extending its service life.

[0012] Preferably, the elastic folding channel further includes a plurality of limiting rings, and the size of the limiting rings is smaller than that of the connecting rings; a limiting ring is arranged between two adjacent connecting rings, and the limiting ring is sleeved on the outer periphery of the net cylinder, or the net cylinder is sleeved on the outer periphery of the limiting ring; the limiting ring is connected to the net cylinder; the cross-sectional area of the net cylinder between two adjacent connecting rings decreases from the end to the middle. By setting the limiting rings, the net cylinder can be waist-reduced, so that when the net cylinder is folded and stored, the netting of the net cylinder is less likely to affect the contraction of the first elastic members, and two adjacent connecting rings can be better stacked together. In addition, the change in the cross-section of the above-mentioned net cylinder can make the net cylinder from bottom to top in the extended state less likely to have wrinkles, thus avoiding affecting the feeding of bait (the wrinkles may also intercept bait).

[0013] Preferably, the feeding device further includes a plurality of fixing ropes. One end of each fixing rope is connected to a floating body, and the other end of each fixing rope is connected to the net cage. The connection node between the fixing rope and the net cage is arranged at an interval from the feeding inlet, and the connection nodes between the fixing ropes and the net cage are arranged at intervals in the circumferential direction of the feeding inlet; a signal generator is arranged in the floating body. By providing the fixing ropes, the stability of the feeding channel can be better maintained. The setting of the signal generator can facilitate the operator to quickly find the floating body.

[0014] The present invention also discloses a floating method for the above-mentioned aquaculture net cage, which includes the following steps: S1: Inflate the main airbag, and stop inflating the main airbag when the net cage body leaves the seabed; S2: Wait for n minutes, where n > 0; S3: Inflate the auxiliary airbag, and stop inflating the auxiliary airbag after the net cage body rises a set distance; S4: If the net cage body floats out of the sea surface, end the process; otherwise, repeat steps S2 and S3 until the net cage body floats out of the sea surface.

[0015] The present invention has the following beneficial effects: When the net cage body is sinking on the seabed, by inflating the main airbag, the buoyancy of the net cage body increases. When the buoyancy of the net cage body increases to a certain extent, it can break away from the seabed and start to float. At this time, since the net cage body is no longer affected by the force of the seabed silt on it, the gravity and buoyancy of the net cage body are unbalanced, and the net cage body will float up at an increased speed. When the net cage body floats up a certain height, limited by the setting of the counterweight, the net cage body decelerates and stops floating. At this time, it can wait for a certain time to allow the fish school to adapt to the current water pressure. Then inflate the auxiliary airbag, and the buoyancy of the auxiliary airbag offsets the self-weight of the counterweight, so that the force exerted by the counterweight on the net cage body decreases. When the buoyancy of the auxiliary airbag reaches a certain level, the net cage body can continue to float. According to the actual required number of stops, different numbers of counterweights can be configured, and then by adjusting the air pressure of the auxiliary airbag, it can be controlled whether the net cage body hovers or floats until the net cage body floats out of the sea surface. By controlling the segmented floating of the net cage body, the safety of the cultured fish can be well guaranteed. When the net cage body needs to sink, exhaust the main airbag and the auxiliary airbag. During the process, by reasonably controlling the exhaust speed, it can be ensured that the net cage body slowly sinks to the seabed.

[0016] The present invention uses airbags as buoyancy carriers. Compared with other fixed buoyancy tanks made of metal, the present invention has the following advantages: 1. The fixed buoyancy tank is usually designed as an integral part of the cage body structure, making it difficult to adjust and replace the machine, and basically impossible to adjust and replace; while in the form of airbags, the structure is refined, and the airbag is an independent component, which can be disassembled, replaced, and has good maintainability. 2. When using a fixed-shaped buoyancy tank, it is necessary to pump and drain the water inside the buoyancy tank for lifting operations. Fouling organisms in the ocean are likely to cause blockage of the intake and drainage holes, and fouling organisms will also grow and reproduce inside the tank, making it difficult to clean; while for airbags, only air intake and exhaust are required, without the need for intake and drainage. The internal space is a closed space and does not come into contact with seawater, so the above problems do not exist. 3. When using a fixed-shaped buoyancy tank for drainage and lifting, if encountering ocean currents and waves, it will cause the water body inside the buoyancy tank to shake and impact the overall cage, easily resulting in problems such as tilting and unstable lifting; while using the airbag lifting scheme, the heavy exhaust process does not involve intake and drainage, and the above problems do not exist. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram when the cage body hovers in water (the feeding device is hidden).

[0019] Figure 3 It is a schematic diagram when the cage body emerges from the sea surface (the feeding device is hidden).

[0020] Figure 4 It is Figure 1 The enlarged schematic diagram of part A in

[0021] Figure 5 It is a three-dimensional schematic diagram of the cage body and the feeding device (the elastic folding channel is in the extended state).

[0022] Figure 6 It is a three-dimensional schematic diagram of the cage body (partial) and the feeding device (the elastic folding channel is in the retracted state).

[0023] Figure 7 It is an elevation schematic diagram of the cage body and the feeding device (the elastic folding channel is in the extended state).

[0024] Figure 8 It is an elevation schematic diagram of the cage body and the feeding device (the elastic folding channel is in the retracted state).

[0025] Figure 9 It is Figure 7 The enlarged schematic diagram of part B in

[0026] Figure 10 It is Figure 8 The enlarged schematic diagram of part C in

[0027] Figure 11 is Figure 9 an enlarged schematic view of part D in

[0028] Description of main component symbols: cage body 10, frame 11, first netting 12, second netting 13; feeding device 20, floating body 21, pulling rope 22, fixing rope 23, limiting guiding rope 24, elastic folding channel 25, net cylinder 26, connecting ring 27, limiting ring 28, first elastic member 29, closing rope 2a; main airbag 31; anchor block 41, connecting rope 42, counterweight 43, auxiliary airbag 44, protection frame 45; sea surface 51, seabed 52. Specific implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] As Figures 1-11 shown, the present invention discloses a culture cage, which includes: a cage body 10, a main lifting device, a segmented lifting device and a feeding device 20.

[0031] The cage body 10 includes a frame 11 and a composite netting. The composite netting is connected to the frame 11, and the two cooperate to form a closed culture space with a relatively stable inner cavity and water flow-through property. The composite netting is formed by splicing the first netting 12 and the second netting 13. Among them, the first netting 12 is a netting with an antifouling function, such as a copper netting, an alloy netting, etc. The setting of the first netting 12 can prevent the mesh holes on it from being blocked, thereby ensuring that the water body inside the cage can exchange with the outside world and ensuring the safety of culture. The second netting 13 can adopt a conventional netting. The area of the first netting 12 accounts for 30-70% of the total area of the composite netting, and the specific proportion is determined according to the water quality requirements of different cultured fish and the volume of the cage body 10. Although 100% coverage of the first netting 12 can be adopted, generally, the netting with an antifouling function is relatively expensive, and a suitable proportion can reduce the cost.

[0032] At the top of the cage body 10, there is a bait feeding inlet. The bait feeding device 20 includes a floating body 21, a pulling rope 22, a fixing rope 23, a limiting and guiding rope 24, and an elastic folding channel 25. The floating body 21 can be a floating ball, on which a signal generator is installed to facilitate tracking and searching. One end of the limiting and guiding rope 24 is connected to the floating body 21, and the other end of the limiting and guiding rope 24 is connected to the frame of the bait feeding inlet. Multiple connecting ropes 42 can be evenly arranged in the circumferential direction of the bait feeding inlet, and the limiting and guiding rope 24 is connected to these connecting ropes 42 so that the lower end of the limiting and guiding rope 24 is located at the center of the bait feeding inlet to facilitate bait feeding. By connecting the floating body 21 through the limiting and guiding rope 24, the floating body 21 can be restricted within a certain range on the sea surface 51 above the cage body 10.

[0033] One end of the fixing rope 23 is connected to the floating body 21, and the other end is connected to the frame 11 of the cage body 10. The connection node of the fixing rope 23 and the cage body 10 is arranged at an interval from the bait feeding inlet, and the connection nodes of the fixing rope 23 and the cage body 10 are arranged at intervals in the circumferential direction of the bait feeding inlet. The setting of the fixing rope 23 can better limit the position of the floating body 21, thus ensuring the stability of the bait feeding channel.

[0034] The elastic folding channel 25 includes a net cylinder 26, a plurality of connecting rings 27, a plurality of limiting rings 28, and a plurality of first elastic members 29. The net cylinder 26 is made of a flexible net with fine mesh holes. The net cylinder 26 is sleeved on the limiting and guiding rope 24. The bottom opening of the net cylinder 26 is communicated with the bait inlet, and the top opening of the net cylinder 26 can extend to the sea surface 51. The bottom opening of the net cylinder 26 is connected to the frame 11 of the bait inlet, and can be connected through the connecting rings 27, so that the netting of the net cylinder 26 is less likely to be damaged. The connecting rings 27 are arranged at intervals along the length direction of the net cylinder 26. The net cylinder 26 is connected to the connecting rings 27, and the setting of the connecting rings 27 can well open the net cylinder 26. The net cylinder 26 can be integrally formed, that is, the net cylinder 26 is not divided into multiple segments. As an alternative, the net cylinder 26 is divided into several cylinder segments, and the cylinder segments are connected in series through the connecting rings 27 to form a complete bait feeding channel. The latter is preferred, which is conducive to manufacturing and later maintenance.

[0035] The pairwise adjacent connecting rings 27 are connected by at least one first elastic member 29. Preferably, at least two first elastic members 29 communicate between the pairwise adjacent connecting rings 27, and the first elastic members 29 are evenly arranged to facilitate synchronous contraction. To avoid interference of the flexible netting during contraction, a limiting ring 28 is provided between the pairwise adjacent connecting rings 27. The limiting ring 28 is sleeved on the outer periphery of the net cylinder 26, and the limiting ring 28 is connected to the net cylinder 26. In addition, for the net cylinder 26 (i.e., a section of the cylinder) located between the pairwise adjacent connecting rings 27, its cross-sectional area decreases from the end to the middle, and the position with the smallest cross-sectional area is the connection position of the limiting ring 28. After such an arrangement, the net cylinder 26 in the extended state from bottom is less likely to wrinkle, thus avoiding affecting bait casting and also avoiding the situation where the possible wrinkles intercept the bait.

[0036] As an alternative, the net cylinder 26 is sleeved on the outer periphery of the limiting ring, and the pairwise adjacent limiting rings are connected by at least one second elastic member, such an arrangement is to improve the contraction ability of the elastic folding channel 25. The first elastic member 29 and the second elastic member can be elastic ropes.

[0037] One end of the pull rope 22 is connected to the floating body 21, and the other end is connected to the connecting ring 27 at the uppermost end of the net cylinder 26 to prevent tearing the flexible netting. Multiple pull ropes 22 can be provided. In addition, the length of the pull rope 22 is required to be greater than the length of the limiting guide rope 24.

[0038] Under normal conditions (i.e., non-baiting state), under the action of the self-weight of the connecting ring 27, the self-weight of the limiting ring 28, and the elastic force of the elastic member, the net cylinder 26 can be folded and stored above the bait inlet. When baiting is required, the pull rope 22 is pulled upward to stretch the net cylinder 26, thereby establishing a bait casting channel from the sea surface 51 to the net cage body 10. After the bait casting is completed, the pull rope 22 is released, and under the action of the self-weight of the connecting ring 27, the self-weight of the limiting ring 28, and the elastic force of the elastic member, the net cylinder 26 contracts and folds to complete the storage.

[0039] To prevent cultured fish from escaping in the stored state, a closing rope 2a for tightening the top opening of the elastic folding channel 25 is provided at the top of the net cylinder 26. In addition, an anti-escape net can be provided at the bait inlet or the bottom opening of the elastic folding channel 25. Generally speaking, it is appropriate to set the anti-escape net when the cultured fish are relatively large, so that the mesh of the anti-escape net can be set larger to avoid blocking the passage of the bait.

[0040] The main lifting device includes a main airbag 31 and a first air pipe. The main airbag 31 is fixedly connected to the frame 11 at the top of the cage body 10, and the main airbag 31 is arranged around the outer periphery of the cage body 10 to ensure the cage body 10 floats smoothly. One end of the first air pipe is connected to the main airbag 31, and the other end of the first air pipe extends to the sea surface 51. A first valve is provided at the end of the first air pipe extending to the sea surface 51. The first valve is closed under normal conditions, which can prevent seawater from entering and thus affect the maximum buoyancy of the main airbag 31. The first air pipe can be arranged along the fixing rope 23 and the two are connected together. At the same time, the upper end of the first air pipe can be connected to the floating body 21 for easy finding.

[0041] The segmented lifting device includes several sets of segmented lifting mechanisms, which are arranged around the cage body. Specifically, the segmented lifting mechanism includes an anchor block 41, a connecting rope 42, at least one counterweight 43, at least one auxiliary airbag 44, and at least one second air pipe. One end of the connecting rope 42 is fixedly connected to the frame 11 at the bottom of the cage body, and the other end of the connecting rope 42 is connected to the anchor block 41. The anchor block 41 is arranged at a certain distance from the cage body. The counterweights 43 correspond to the auxiliary airbags 44 one by one. The counterweights 43 are connected to the middle section of the connecting rope 42 and are arranged at intervals on the connecting rope 42. The auxiliary airbags 44 can be connected to the counterweights 43. Since the counterweights 43 will touch the bottom, a protective frame 45 for protecting the auxiliary airbags 44 is additionally provided. The auxiliary airbags 44 are placed in the protective frame 45 to prevent hard objects (such as reefs) on the seabed 52 from causing damage such as scratches and abrasions to the auxiliary airbags 44. As an alternative, the auxiliary airbag 44 is only provided on the counterweight 43 closest to the cage body 10 on the connecting rope 42. The former is preferred in this case.

[0042] Each second air pipe corresponds to at least one auxiliary airbag 44. Generally, it is better that each auxiliary airbag 44 in a set of segmented lifting mechanisms corresponds to a second air pipe. As an alternative, only one second air pipe is configured in a set of segmented lifting mechanisms, and the auxiliary airbags 44 are connected to the second air pipe through a three-way valve. The former is preferred in this case. One end of the second air pipe is connected to the auxiliary airbag 44, and the other end of the second air pipe extends to the sea surface 51. A second valve is provided at the end of the second air pipe extending to the sea surface 51. The second air pipe is also laid along the connecting rope 42 and the fixing rope 23 in sequence and is fixed to the connecting rope 42 and the fixing rope 23 at the same time. The upper end of the second air pipe can be connected to the floating body 21 for easy finding. As a preferred solution, only one counterweight 43 is provided for each set of segmented lifting mechanisms, which is beneficial for floating control.

[0043] To ensure that the aquaculture cage can be lifted and lowered, in this case, it is required that the maximum buoyancy of the auxiliary airbag 44 is not less than the gravity of the corresponding counterweight 43, and the sum of the gravity of the cage body 10 and the force exerted by the seabed 52 on the cage body 10 is less than the maximum buoyancy of the main airbag 31. Define the counterweight 43 closest to the cage body in each segmented lifting mechanism as the first counterweight. Then, the sum of the gravity of the cage body and the gravity of all the first counterweights is greater than the maximum buoyancy of the main airbag 31. Preferably, all the counterweights 43 have the same weight, and the arrangement of the counterweights 43 on the connecting rope 42 in each segmented lifting mechanism is the same. It is better that the distance and height difference between the anchor block 41 and the cage body are the same.

[0044] The method for the above aquaculture cage to float includes the following steps: S1: Inflate the main airbag 31. When the buoyancy of the main airbag 31 is greater than the sum of the self-gravity of the cage body 10 and the force exerted by the seabed 52 silt on it, the cage body 10 can leave the seabed 52. At this time, stop inflating the main airbag 31, and the cage body 10 starts to float. When the cage body 10 floats a certain distance, because it is necessary to pull the counterweight 43 closest to it and sinking on the seabed 52, under the action of the gravity of this counterweight 43, the cage body 10 will decelerate and hover. The hovering height of the cage body 10 when floating (i.e., the distance from the seabed 52 to the bottom of the cage body 10) depends on the length of the counterweight 43 on the connecting rope 42 to the cage body 10.

[0045] S2: Wait for n minutes, where n > 0. The waiting time is considered according to factors such as the floating distance of the cage body 10 and the types of cultured fish. Waiting for a certain time can allow the cultured fish to adapt to the change in water pressure.

[0046] S3: Inflate the auxiliary airbag 44 corresponding to the counterweight 43 closest to the cage body 10 and sinking on the seabed 52. The buoyancy of this auxiliary airbag 44 starts to increase, and the buoyancy of the auxiliary airbag 44 will offset the gravity of the corresponding counterweight 43. When the buoyancy of the auxiliary airbag 44 reaches a certain level, the cage body 10 can continue to float. At this time, stop inflating the auxiliary airbag 44. At this time, if the cage body 10 has not emerged from the sea surface 51 and is restricted by the counterweight 43 that has not been pulled up, the cage body 10 can hover again to allow the cultured fish to adapt to the change in water pressure.

[0047] S4: If the cage body 10 emerges from the sea surface 51, it ends. Otherwise, repeat steps S2 and S3 until the cage body 10 emerges from the sea surface 51. The number of times steps S2 and S3 are repeated is comprehensively considered according to factors such as the water level height of the location where the cage body 10 is located and the types of cultured fish.

[0048] In this case, the main airbag 31 and auxiliary airbag 44 are designed so that when not inflated underwater, they can be flattened by water pressure. The buoyancy of the flattened main airbag 31 and auxiliary airbag 44 is almost negligible. Furthermore, the main airbag 31 and auxiliary airbag 44 do not require water inlet and outlet control, making control simpler and making the internal cavities of the main airbag 31 and auxiliary airbag 44 less susceptible to contamination and blockage. The main airbag 31 and auxiliary airbag 44 can be inflated by connecting the first and second air pipes to an air compressor located above the sea surface 51.

[0049] The setting of the auxiliary air bag 44 can make the floating control of the cage body 10 simpler. During the first stage of floating, the main air bag 31 can be directly inflated until the cage body 10 floats and then stops. When floating in stages, the auxiliary air bag 44 can be inflated in turn until the cage body 10 floats and then stops. There is no need to set up sensors to balance the buoyancy changes. The control requirements are low, it is easier to operate, and the failure rate is also lower.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A culture net cage, characterized in that, Comprising: A cage body, a main lifting device, and a segmented lifting device; The main lifting device includes a main airbag and a first air pipe. The main airbag is connected to the top of the cage body and surrounds the outer periphery of the cage body. One end of the first air pipe is communicated with the main airbag, the other end of the first air pipe extends to the sea surface, and a first valve is provided at the end of the first air pipe extending to the sea surface; The segmented lifting device includes a plurality of sets of segmented lifting mechanisms, and the segmented lifting mechanisms are arranged around the cage body; the segmented lifting mechanism includes an anchor block, a connecting rope, at least one counterweight, at least one auxiliary airbag, and at least one second air pipe. One end of the connecting rope is connected to the bottom of the cage body, and the other end of the connecting rope is connected to the anchor block; the counterweight is connected to the middle section of the connecting rope, and the counterweights are arranged at intervals on the connecting rope; the auxiliary airbag corresponds to the counterweight one by one, or the auxiliary airbag is arranged corresponding to the counterweight closest to the cage body on the connecting rope, and the auxiliary airbag is connected to the counterweight or the connecting rope; each second air pipe corresponds to at least one auxiliary airbag, one end of the second air pipe is communicated with the auxiliary airbag, the other end of the second air pipe extends to the sea surface, and a second valve is provided at the end of the second air pipe extending to the sea surface.

2. The aquaculture cage according to claim 1, characterized in that: The maximum buoyancy of the auxiliary airbag is not less than the gravity of the corresponding counterweight; the sum of the gravity of the cage body and the acting force of the seabed on the cage body is less than the maximum buoyancy of the main airbag; define the counterweight closest to the cage body in each segmented lifting mechanism as the first counterweight, then the sum of the gravity of the cage body and the gravity of all the first counterweights is greater than the maximum buoyancy of the main airbag.

3. The aquaculture cage according to claim 1, characterized in that: It further includes a protection frame corresponding to the auxiliary airbag one by one, and the auxiliary airbag is placed in the protection frame.

4. The aquaculture cage according to claim 1, characterized in that: The cage body includes a frame and a composite netting, and the composite netting is connected to the frame; the composite netting is formed by splicing a first netting and a second netting, wherein the first netting is a netting with an antifouling function.

5. The aquaculture cage according to claim 4, characterized in that: The area of the first netting accounts for 30-70% of the total area of the composite netting.

6. The aquaculture cage according to claim 1, wherein: It further includes a feeding device, and the feeding device includes a floating body, a pulling rope, a limiting guide rope, and an elastic folding channel. A feeding inlet is provided at the top of the cage body; the bottom of the elastic folding channel is connected to the aquaculture cage, and the elastic folding channel is communicated with the feeding inlet of the aquaculture cage; the top of the elastic folding channel is connected to the floating body through the pulling rope; one end of the limiting guide rope is connected to the floating body, the other end of the limiting guide rope is connected to the aquaculture cage, and the elastic folding channel is slidably connected relative to the limiting guide rope.

7. The aquaculture cage according to claim 6, characterized in that: The elastic folding channel includes a net cylinder, a plurality of connecting rings, and a plurality of first elastic members. The net cylinder is made of a flexible netting; the connecting rings are arranged at intervals along the length direction of the net cylinder, and the net cylinder is connected to the connecting rings; two adjacent connecting rings are connected by at least one first elastic member.

8. The aquaculture cage according to claim 7, wherein: The elastic folding channel further includes a plurality of limiting rings, the size of the limiting rings being smaller than that of the connecting rings; a limiting ring is arranged between two adjacent connecting rings, the limiting ring is sleeved on the outer periphery of the net cylinder, or the net cylinder is sleeved on the outer periphery of the limiting ring; the limiting ring is connected to the net cylinder; the cross-sectional area of the net cylinder located between two adjacent connecting rings decreases from the end to the middle.

9. The aquaculture cage according to claim 1, wherein: The bait feeding device further includes a plurality of fixing ropes, one end of each fixing rope is connected to a floating body, the other end of each fixing rope is connected to the net cage, the connection node of the fixing rope and the net cage is arranged at an interval from the bait feeding inlet, and the connection nodes of the fixing rope and the net cage are arranged at intervals in the circumferential direction of the bait feeding inlet; a signal generator is arranged in the floating body.

10. The floating method of the aquaculture cage according to any one of claims 1-9, characterized in that, It includes the following steps: S1: Inflate the main airbag and stop inflating the main airbag when the net cage body leaves the seabed; S2: Wait for n minutes, where n > 0; S3: Inflate the auxiliary airbag and stop inflating the auxiliary airbag after the net cage body rises by a set distance; S4: If the net cage body floats out of the sea surface, end; otherwise, repeat steps S2 and S3 until the net cage body floats out of the sea surface.

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