Large net cage fishing device and fishing method for yellow fin tuna culture

Abstract

The invention relates to the technical field of net cage fishing devices, and discloses a large-scale net cage fishing device for yellow fin tuna culture and a fishing method.The large-scale net cage fishing device comprises a piston rod fixedly connected to the inner wall of a piston sleeve, a plurality of water outlet holes are formed in the outer wall of the piston sleeve, and a plurality of through grooves are formed in the inner wall of the piston sleeve; a plurality of water outlet holes II are formed in the outer wall of the piston cylinder; when the bottom ring moves to the connecting rings, the connecting rings can be driven to move together, at the moment, along with movement of the connecting rings, the two adjacent connecting rings at the bottommost end can get close to each other, and at the moment, the piston sleeve and the piston barrel which are arranged between the two adjacent connecting rings also get close to each other; the piston cylinder can discharge the seawater in the piston sleeve through the water outlet hole, and the piston rod arranged in the piston sleeve can also discharge the seawater accumulated in the piston cylinder through the second water outlet hole when the piston sleeve and the piston cylinder get close to each other.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of net cage fishing devices, in particular to a large-scale net cage fishing device for yellowfin tuna breeding and a fishing method. BACKGROUND

[0002] Yellowfin tuna is a high-end marine fish with firm and tender meat and extremely high nutritional value. It is rich in EPA and DHA and other polyunsaturated fatty acids, and is favored by consumers around the world. It is an important food material for raw food culture and has a broad market prospect and extremely high economic value. Unlike conventional marine fish, yellowfin tuna has unique biological characteristics: it is a middle-upper layer migratory fish with fast swimming speed and strong activity. The gill muscle degenerates, and continuous swimming is necessary to ensure oxygen supply to the gill. Stopping swimming can easily cause oxygen deficiency and death. At the same time, the skin tissue is thin and fragile, and is easily damaged after collision and friction. Environmental changes or improper fishing operations can easily cause strong stress response, leading to decreased fish quality and increased mortality, significantly reducing the economic benefits of breeding. In addition, with the continuous expansion of the breeding scale, large-scale net cages are increasingly widely used, and the traditional small-scale net cage fishing method cannot meet the fishing needs of large-scale net cages. Therefore, the development of a fishing device and method that can adapt to large-scale net cages and balance fishing efficiency and fish quality has become a key supporting technology for large-scale yellowfin tuna breeding and an urgent need for industry development.

[0003] In actual use, when the net is retracted to catch yellowfin tuna, the net will overlap and interleave after being retracted, which may cause damage to the net when it is unfolded again. At the same time, under the action of water flow, the net may enter the inside of the net cage, which may cause the net inside the net cage to entangle with the fish population, causing damage to the net cage and the fish, affecting fishing efficiency and cost. SUMMARY

[0004] To solve the above technical problems, the present application provides a large-scale net cage fishing device for yellowfin tuna breeding, which comprises a floating platform, a net fixedly connected to the outer wall of the floating platform, a plurality of motors fixedly connected to the outer wall of the floating platform, and a plurality of winding devices fixedly connected to the outer wall of the floating platform, further comprising:

[0005] A driving mechanism is fixedly arranged on the outer wall of the net, and is used for driving the fish population when the net is retracted;

[0006] A limiting mechanism is fixedly arranged on the inner wall of the driving mechanism, and is used for limiting the movement of the driving mechanism to a certain extent;

[0007] A protection mechanism is fixedly arranged on the outer wall of the winding device, and is used for protecting the net to a certain extent;

[0008] The outer wall of the net cover is fixedly connected with a connecting ring, the outer wall of the net cover is fixedly connected with a bottom ring, and the outer wall of the connecting ring is fixedly connected with a plurality of connecting rods.

[0009] The outer wall of the motor is fixedly connected with the inner wall of the winding device, the connecting ring is located on the outer side of the net cage, the connecting rod is located on the inner side of the net cover, and the bottom ring is fixed at the bottom of the net cover.

[0010] Preferably, the driving mechanism comprises:

[0011] The support assembly is fixedly arranged at the outer wall of the connecting rod;

[0012] The driving assembly is fixedly arranged at the inner wall of the support assembly;

[0013] The support assembly is used to provide a mounting position and support for the components in the driving assembly.

[0014] Preferably, the limiting mechanism comprises:

[0015] The limiting assembly is fixedly arranged at the inner wall of the driving assembly;

[0016] The movable assembly is fixedly arranged at the inner wall of the limiting assembly;

[0017] The limiting assembly is used to limit the movement of the driving assembly, and part of the components of the movable assembly move in the limiting assembly.

[0018] Preferably, the protection mechanism comprises:

[0019] The protection assembly is fixedly arranged at the outer wall of the connecting ring;

[0020] The protection assembly comprises a limiting ring fixedly connected to the winding device, the outer wall of the connecting ring is fixedly connected with a plurality of fixing rings, the outer wall of the bottom ring is fixedly connected with a plurality of fixing rods, and the outer wall of the floating platform is fixedly connected with a plurality of limiting rings.

[0021] When the farmed yellowfin tuna needs to be captured, the motor is started first, so that the motor drives the winding device to wind the cable, so that the cable is wound in the winding device, and when the cable is driven by the winding device, the fixing rod moves together with the floating platform, the movement of the fixing rod drives the bottom ring to move, and the movement of the bottom ring causes the net cover to start shrinking from bottom to top.

[0022] Preferably, the support assembly comprises a plurality of piston sleeves fixedly connected to the outer wall of the connecting ring, and the outer wall of the connecting ring is fixedly connected with a plurality of piston cylinders.

[0023] Preferably, the driving assembly comprises a piston rod fixedly connected at the inner wall of the piston sleeve, a plurality of water outlet holes are arranged at the outer wall of the piston sleeve, a plurality of through grooves are arranged at the inner wall of the piston sleeve, and a plurality of water outlet holes two are arranged at the outer wall of the piston sleeve;

[0024] When the shrinking of the net is completed, the qualified target fish is captured by using a special fishing tool, and after the capture is completed, the motor is started to drive the winding device to release the pull cable, the net sinks to the bottom of the water under the action of its own gravity, and the net starts to stretch. With further movement, the connecting ring will also gradually sink, and before the connecting ring sinks, the piston sleeve and the piston cylinder have been shrunk relative to each other. However, due to the water outlet holes and the water outlet holes two, seawater will enter the space between the piston cylinder, the piston sleeve and the piston rod. When the connecting ring starts to move away from each other, it will drive the piston sleeve and the piston cylinder to move away from each other. At this time, the seawater in the space between the piston sleeve, the piston cylinder and the piston rod will be discharged through the water outlet holes and the water outlet holes two;

[0025] Preferably, the limiting assembly comprises a limiting ball slidingly connected at the inner wall of the piston sleeve, a reset spring is fixedly connected at the inner wall of the piston sleeve, and a plurality of notches are arranged at the inner wall of the piston cylinder.

[0026] When the piston sleeve and the piston cylinder move away from each other, seawater will enter the piston sleeve and the piston cylinder through part of the water outlet holes and the water outlet holes two. However, at this time, the tension between the piston sleeve and the piston cylinder is large, so that the negative pressure near the limiting ball and the limiting ball two in the piston sleeve and the piston cylinder is high. This results in that the water inlet of the water outlet holes and the water outlet holes two near the limiting ball and the limiting ball two cannot meet the water inlet. At this time, under the action of negative pressure, the limiting ball and the limiting ball two will move towards the reset spring and the limiting spring, and the reset spring and the limiting spring will be compressed. With the movement of the limiting ball and the limiting ball two, the piston sleeve and the piston cylinder will be connected with the seawater outside through the through grooves and the notches, thereby increasing the water inlet.

[0027] When the bottom ring moves to the connecting ring, it will drive the connecting ring to move. At this time, with the movement of the connecting ring, the two adjacent connecting rings at the bottom end will move close to each other. At this time, the piston sleeve and the piston cylinder arranged between the two adjacent connecting rings will also move close to each other. When the piston cylinder and the piston sleeve move close to each other, the piston cylinder will discharge the seawater in the piston sleeve through the water outlet holes. The piston rod arranged in the piston sleeve will also discharge the seawater accumulated in the piston cylinder through the water outlet holes two when the piston sleeve and the piston cylinder move close to each other. In this process, the limiting ball and the limiting ball two will be tightly attached to the inner walls of the piston sleeve and the piston cylinder under the action of the reset spring, the limiting spring and the seawater.

[0028] Preferably, the movable assembly comprises a limiting ball II connected to the inner wall of the piston cylinder in a sliding manner, a limiting spring is fixedly connected to the inner wall of the piston cylinder, and a pull cable is fixedly connected to the outer wall of the winding device;

[0029] Preferably, the protection assembly further comprises a plurality of sliding rings connected to the outer wall of the floating platform in a sliding manner, a rotating rod is rotatably connected to the inner wall of the sliding ring, and a fixed pull rod is rotatably connected to the inner wall of the rotating rod.

[0030] When the winding device winds the pull cable, the net cover between two adjacent connecting rings will overlap each other and wrinkle due to the loss of pulling of the connecting ring, and at the same time, when the net cover overlaps, seawater may enter the net cage due to the driving of seawater, at this time, since the fixed pull rod is fixed to the net cover between two adjacent connecting rings, when the connecting ring at the lower end of the net cage rises and passes the fixed pull rod to continue rising, the fixed pull rod will exert a certain pulling force on the net cover under the action of the rotating rod and the sliding ring, and at the same time, the sliding ring, the rotating rod and the fixed pull rod will rotate with each other, and at the same time, the sliding ring will be lifted together, when the sliding ring moves to the limiting ring, the sliding ring will be limited and cannot move, and after the connecting ring moves, the sliding ring pulls the fixed pull rod to exert a pulling force on the net cover, so as to pull out the slack net cover from between two adjacent connecting rings.

[0031] A fishing method of a yellowfin tuna breeding large-scale net cage fishing device, comprising the following steps,

[0032] S1: starting the device: starting the motor to drive the winding device to start shrinking the net cover;

[0033] S2: capturing target fish: after the net cover is shrunk, professional capture tools are used to capture qualified target fish.

[0034] The present application has the following beneficial effects:

[0035] (1) In the present application, most of the devices do not limit the shape of the net cover when shrinking the net cover, which leads to the fact that part of the net cover enters the net cage, and this part of the net cover will be entangled with the fish group when fishing the fish group, which will cause damage to the fish body and cause loss, at this time, through the protection mechanism, the net cover is pulled out of the net cage when shrinking the net cover, reducing the contact between the net cover and the fish group and reducing the probability of damage to the fish group.

[0036] (2) During the capture process, as the net gradually shrinks, the activity space of the fish decreases. Due to the biological characteristics of yellowfin tuna, they must swim continuously to obtain oxygen. This may cause some fish to be stressed and collide with the inner wall of the net cage, resulting in damage to both the equipment and the fish. At this time, the driving mechanism sprays seawater into the net cage when the net shrinks, forming a water flow barrier inside the net. By utilizing the yellowfin tuna's sensory sensitivity to water flow disturbance and water pressure changes, and the sprayed water flow is relatively continuous and gentle, the fish's startled reaction is reduced, and the fish are guided to gather in the center, thereby reducing the probability of the fish colliding with the net cage due to the shrinking space.

[0037] (3) In this invention, the density of fish increases sharply after the net shrinks and the space is small, which leads to the rapid consumption of dissolved oxygen in the local water, resulting in oxygen deficiency in the fish and affecting the quality. By utilizing the above-mentioned mechanism, when water is sprayed into the net cage, it will drive the water in the net to circulate from the surface to the bottom, increase the mixing of high dissolved oxygen water and low dissolved oxygen water, increase the dissolved oxygen content in the water in the net, and reduce the problem of fish quality decline due to insufficient dissolved oxygen.

[0038] (4) The present invention utilizes the operating mechanism of the above-mentioned mechanism and sets up a limiting mechanism. Since the remaining fish are in a relatively sensitive state after the qualified target fish are captured, when the net is stretched, the operating mechanism in the limiting mechanism will limit the speed of the net unfolding, reducing the possibility of the fish being startled. At the same time, the protective mechanism is used to make the net unfold from the outside of the net cage to the inside when it is unfolded, thereby reducing the probability of the fish coming into contact with the net, reducing the injury to some fish caused by the fish being startled, and affecting the breeding cost. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is a partial structural diagram of the present invention;

[0042] Figure 3 This is a cross-sectional schematic diagram of the driving mechanism of the present invention;

[0043] Figure 4 This is a cross-sectional schematic diagram of the support component of the present invention;

[0044] Figure 5 This is a cross-sectional schematic diagram of the repellent component of the present invention;

[0045] Figure 6 This is a cross-sectional schematic diagram of the internal structure of the piston sleeve of the present invention;

[0046] Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle;

[0047] Figure 8 This is a cross-sectional schematic diagram of the internal structure of the piston cylinder of the present invention;

[0048] Figure 9 For the present invention Figure 8 Enlarged view of point B in the middle;

[0049] Figure 10 This is a cross-sectional schematic diagram of the protective mechanism of the present invention;

[0050] Figure 11 This is a schematic diagram of the working state of the rotating rod of the present invention;

[0051] Figure 12 This is a cross-sectional schematic diagram of the protective component of the present invention;

[0052] Figure 13 This is a schematic diagram of the workflow of the present invention.

[0053] The attached diagram lists the components represented by each number as follows:

[0054] In the diagram: 1. Driving mechanism; 2. Restricting mechanism; 3. Protective mechanism; 11. Support assembly; 12. Driving assembly; 13. Floating platform; 14. Netting; 15. Motor; 16. Winding device; 21. Restricting assembly; 22. Movable assembly; 31. Protective assembly; 111. Connecting ring; 112. Bottom ring; 113. Connecting rod; 114. Piston sleeve; 115. Piston cylinder; 121. Piston rod; 122. Water outlet; 123. Through groove; 124. Water outlet two; 211. Restricting ball; 212. Return spring; 213. Groove; 221. Restricting ball two; 222. Restricting spring; 223. Cable; 311. Fixed ring; 312. Fixed rod; 313. Restricting ring; 321. Sliding ring; 322. Rotating rod; 323. Fixed pull rod. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Example 1, please refer toFigure 1 - Figure 13 This invention relates to a large-scale net cage harvesting device for yellowfin tuna aquaculture, comprising a floating platform 13, a net 14 fixedly connected to the outer wall of the floating platform 13, a plurality of motors 15 fixedly connected to the outer wall of the floating platform 13, and a plurality of winding devices 16 fixedly connected to the outer wall of the floating platform 13, and further comprising:

[0057] The driving mechanism 1 is fixedly installed on the outer wall of the net 14 and is used to drive away the fish when the net is pulled in.

[0058] The limiting mechanism 2 is fixedly installed on the inner wall of the driving mechanism 1. The limiting mechanism 2 is used to restrict the movement in the driving mechanism 1.

[0059] Protective mechanism 3 is fixedly installed on the outer wall of the winding device 16 and is used to provide certain protection for the net 14.

[0060] A connecting ring 111 is fixedly connected to the outer wall of the mesh 14, a bottom ring 112 is fixedly connected to the outer wall of the mesh 14, and several connecting rods 113 are fixedly connected to the outer wall of the connecting ring 111.

[0061] The outer wall of the motor 15 is fixedly connected to the inner wall of the winding device 16, the connecting ring 111 is located on the outside of the net box, the connecting rod 113 is located on the inside of the net 14, and the bottom ring 112 is fixed at the bottom of the net 14.

[0062] The driving mechanism 1 includes:

[0063] Support component 11 is fixedly installed on the outer wall of connecting rod 113;

[0064] The driving component 12 is fixedly installed on the inner wall of the support component 11;

[0065] The support component 11 is used to provide installation positions and support for the components in the driving component 12.

[0066] Restricted agency 2 includes:

[0067] Restriction component 21 is fixedly installed on the inner wall of the repelling component 12;

[0068] The active component 22 is fixedly installed on the inner wall of the limiting component 21;

[0069] The limiting component 21 is used to restrict the movement of the driving component 12, and some parts of the active component 22 move within the limiting component 21.

[0070] Protective mechanism 3 includes:

[0071] Protective component 31 is fixedly installed on the outer wall of connecting ring 111;

[0072] The protective component 31 includes a limiting ring 313 fixedly connected to the winding device 16, a plurality of fixing rings 311 fixedly connected to the outer wall of the connecting ring 111, a plurality of fixing rods 312 fixedly connected to the outer wall of the bottom ring 112, and a plurality of limiting rings 313 fixedly connected to the outer wall of the floating platform 13.

[0073] When in use, when it is necessary to catch farmed yellowfin tuna, first start the motor 15, so that the motor 15 drives the winding device 16 to wind the cable 223, so that the cable 223 is wound in the winding device 16. When the cable 223 is driven by the winding device 16, it will move the fixing rod 312 towards the floating platform 13. The movement of the fixing rod 312 will drive the bottom ring 112 to move together, and the movement of the bottom ring 112 will cause the net 14 to begin to shrink from bottom to top.

[0074] The support assembly 11 includes a plurality of piston sleeves 114 fixedly connected to the outer wall of the connecting ring 111, and a plurality of piston cylinders 115 fixedly connected to the outer wall of the connecting ring 111.

[0075] The driving assembly 12 includes a piston rod 121 fixedly connected to the inner wall of the piston sleeve 114, a plurality of water outlet holes 122 are opened on the outer wall of the piston sleeve 114, a plurality of through grooves 123 are opened on the inner wall of the piston sleeve 114, and a plurality of water outlet holes 124 are opened on the outer wall of the piston cylinder 115.

[0076] When the net 14 is fully contracted, a special fishing tool is used to catch the qualified target fish. After the catch is completed, the motor 15 is started, which drives the winding device 16 to release the cable 223. The net 14 will sink to the bottom of the water under the weight of the bottom ring 112, causing the net 14 to begin to extend. As it moves further, the connecting ring 111 will also gradually sink. Before the connecting ring 111 sinks, the piston sleeve 114 and the piston cylinder 115 have already contracted each other. However, due to the action of the water outlet 122 and the second water outlet 124, seawater will enter the space between the piston cylinder 115, the piston sleeve 114 and the piston rod 121 through the two. When the connecting ring 111 begins to move away from each other, it will cause the piston sleeve 114 and the piston cylinder 115 to move away from each other together. At this time, the seawater in the space between the piston sleeve 114, the piston cylinder 115 and the piston rod 121 will be discharged through the water outlet 122 and the second water outlet 124.

[0077] The limiting component 21 includes a limiting ball 211 that is slidably connected to the inner wall of the piston sleeve 114, a return spring 212 that is fixedly connected to the inner wall of the piston sleeve 114, and a plurality of slots 213 that are opened on the inner wall of the piston cylinder 115.

[0078] When the piston sleeve 114 and piston cylinder 115 move away from each other, seawater will enter the piston sleeve 114 and piston cylinder 115 through part of the water outlet 122 and water outlet 124. However, at this time, the tension between the piston sleeve 114 and piston cylinder 115 is relatively large when they move away from each other, resulting in a higher negative pressure on the side of the piston sleeve 114 and piston cylinder 115 near the limiting ball 211 and limiting ball 221. This leads to a higher negative pressure on the side near the limiting ball 211 and limiting ball 221. If the water outlet 122 and water outlet 224 cannot meet the water intake, under the action of negative pressure, the limiting ball 211 and limiting ball 221 will move towards the return spring 212 and limiting spring 222, and compress the return spring 212 and limiting spring 222. As the limiting ball 211 and limiting ball 221 move, the piston sleeve 114 and piston cylinder 115 will be connected to the outside seawater through the through groove 123 and the groove opening 213, thereby increasing the water intake.

[0079] When the bottom ring 112 moves to the connecting ring 111, it will cause the connecting ring 111 to move together. At this time, as the connecting ring 111 moves, the two bottommost adjacent connecting rings 111 will move closer to each other. At this time, the piston sleeve 114 and piston cylinder 115 set between the two adjacent connecting rings 111 will also move closer to each other. When the piston cylinder 115 and piston sleeve 114 move closer to each other, the piston cylinder 115 will discharge the seawater in the piston sleeve 114 through the water outlet 122. The piston rod 121 set inside the piston sleeve 114 will also discharge the seawater accumulated in the piston cylinder 115 through the second water outlet 124 when the piston sleeve 114 and piston cylinder 115 move closer to each other. During this process, the limiting ball 211 and the second limiting ball 221 will be pressed tightly against the inner wall of the piston sleeve 114 and piston cylinder 115 under the action of the return spring 212, the limiting spring 222 and the seawater.

[0080] The active component 22 includes a limiting ball 221 that is slidably connected to the inner wall of the piston cylinder 115, a limiting spring 222 that is fixedly connected to the inner wall of the piston cylinder 115, and a cable 223 that is fixedly connected to the outer wall of the winding device 16.

[0081] The protective component 31 also includes several sliding rings 321 that are slidably connected to the outer wall of the floating platform 13. A rotating rod 322 is rotatably connected to the inner wall of the sliding ring 321, and a fixed tie rod 323 is rotatably connected to the inner wall of the rotating rod 322.

[0082] When the winding device 16 winds up the cable 223, the netting 14 between two adjacent connecting rings 111 will overlap due to the loss of tension from the connecting rings 111, resulting in wrinkles. Simultaneously, when the netting 14 overlaps, seawater may enter the net cage due to its movement. Since the fixed rod 323 is fixed to the netting between the two adjacent connecting rings 111, as the connecting ring 111 near the lower end of the net cage rises, it passes the fixed rod 323 and continues to rise. The fixed rod 323 will then be affected by the interaction between the rotating rod 322 and the sliding ring 321. When the connecting ring 111 is raised, the sliding ring 321, the rotating rod 322, and the fixed pull rod 323 will rotate relative to each other. At the same time, the sliding ring 321 will be driven to rise along with it. When the sliding ring 321 moves to the limiting ring 313, the sliding ring 321 will be restricted and unable to move. After the connecting ring 111 continues to move, the sliding ring 321 causes the rotating rod 322 to pull the fixed pull rod 323, applying a pulling force to the netting 14, thereby pulling the loose netting 14 out from between the two adjacent connecting rings 111.

[0083] A method for harvesting yellowfin tuna in a large net cage, comprising the following steps:

[0084] S1: Starting device: Start motor 15 to drive winding device 16 to begin shrinking netting 14;

[0085] S2: Capture the target fish: After the net 14 has retracted, use professional capture tools to capture the qualified target fish.

[0086] A specific application of this embodiment is as follows: When it is necessary to catch farmed yellowfin tuna, the motor 15 is started first, so that the motor 15 drives the winding device 16 to wind the cable 223, so that the cable 223 is wound in the winding device 16. When the cable 223 is driven by the winding device 16, it will move the fixing rod 312 towards the floating platform 13 together. The movement of the fixing rod 312 will drive the bottom ring 112 to move together, and the movement of the bottom ring 112 will cause the net 14 to start to shrink from bottom to top.

[0087] When the bottom ring 112 moves to the connecting ring 111, it will cause the connecting ring 111 to move together. At this time, as the connecting ring 111 moves, the two bottommost adjacent connecting rings 111 will move closer to each other. At this time, the piston sleeve 114 and piston cylinder 115 set between the two adjacent connecting rings 111 will also move closer to each other. When the piston cylinder 115 and piston sleeve 114 move closer to each other, the piston cylinder 115 will discharge the seawater in the piston sleeve 114 through the water outlet 122. The piston rod 121 set inside the piston sleeve 114 will also discharge the seawater accumulated in the piston cylinder 115 through the second water outlet 124 when the piston sleeve 114 and piston cylinder 115 move closer to each other. During this process, the limiting ball 211 and the second limiting ball 221 will be pressed tightly against the inner wall of the piston sleeve 114 and piston cylinder 115 under the action of the return spring 212, the limiting spring 222 and the seawater.

[0088] When the winding device 16 winds up the cable 223, the netting 14 between two adjacent connecting rings 111 will overlap due to the loss of tension from the connecting rings 111, resulting in wrinkles. Simultaneously, when the netting 14 overlaps, seawater may enter the net cage due to its movement. Since the fixed rod 323 is fixed to the netting between the two adjacent connecting rings 111, as the connecting ring 111 near the lower end of the net cage rises, it passes the fixed rod 323 and continues to rise. The fixed rod 323 will then be affected by the interaction between the rotating rod 322 and the sliding ring 321. When the connecting ring 111 is raised, the sliding ring 321, the rotating rod 322, and the fixed pull rod 323 will rotate relative to each other. At the same time, the sliding ring 321 will be driven to rise along with it. When the sliding ring 321 moves to the limiting ring 313, the sliding ring 321 will be restricted and unable to move. After the connecting ring 111 continues to move, the sliding ring 321 causes the rotating rod 322 to pull the fixed pull rod 323, applying a pulling force to the netting 14, thereby pulling the loose netting 14 out from between the two adjacent connecting rings 111.

[0089] When the net 14 is fully contracted, a specialized fishing tool is used to catch the target fish. After the catch is complete, the motor 15 is activated, causing the winding device 16 to release the cable 223. The net 14, under the weight of the bottom ring 112, sinks to the bottom, causing it to extend. As it moves further, the connecting ring 111 also gradually sinks. Before the connecting ring 111 sinks, the piston sleeve 114 and piston cylinder 115 have already contracted. However, due to the action of the water outlet 122 and water outlet 124, seawater will enter the space between the piston cylinder 115, piston sleeve 114, and piston rod 121 through both. When the connecting ring 111 begins to move away from each other, it will cause the piston sleeve 114 and piston cylinder 115 to move away from each other as well. At this time, the seawater in the space between the piston sleeve 114, piston cylinder 115, and piston rod 121 will flow through the water outlet 122 and water outlet 124. During discharge, as the piston sleeve 114 and piston cylinder 115 move away from each other, seawater will enter the piston sleeve 114 and piston cylinder 115 through some of the water outlet holes 122 and 124. However, at this time, the tension between the piston sleeve 114 and piston cylinder 115 is relatively large when they move away from each other, resulting in a higher negative pressure on the side of the piston sleeve 114 and piston cylinder 115 near the limiting ball 211 and the second limiting ball 221. This leads to a higher negative pressure near the limiting ball 211 and the second limiting ball 221. If the water outlet 122 and water outlet 124 on one side cannot meet the water intake, under the action of negative pressure, the limiting ball 211 and limiting ball 221 will move towards the return spring 212 and limiting spring 222, and the return spring 212 and limiting spring 222 will be compressed. As the limiting ball 211 and limiting ball 221 move, the piston sleeve 114 and piston cylinder 115 will be connected to the outside seawater through the through groove 123 and the groove opening 213, thereby increasing the water intake.

[0090] Since most devices do not restrict the shape of the net 14 when it is retracted, some of the net 14 will enter the net cage. When catching fish, this part of the net 14 will become entangled with the fish, causing damage to the fish and resulting in losses. At this time, the protective mechanism 3 pulls the net 14 out of the net cage when it is retracted, reducing the contact between the net 14 and the fish and reducing the probability of fish injury.

[0091] During the capture process, as the net 14 gradually contracts, the fish's activity space decreases. Due to the biological characteristics of yellowfin tuna, they must continuously swim to obtain oxygen, which may cause some fish to become stressed and collide with the inner wall of the net cage, resulting in damage to both the equipment and the fish. At this time, the driving mechanism 1 sprays seawater into the net cage when the net 14 contracts, forming a water flow barrier inside the net 14. Taking advantage of the yellowfin tuna's sensory sensitivity to water flow disturbances and water pressure changes, the sprayed water flow is relatively continuous and gentle, reducing the fish's startled reaction and guiding the fish to gather in the center, thereby reducing the probability of the fish colliding with the net cage due to the shrinking space.

[0092] Because the density of fish increases sharply after the net 14 shrinks and the space is small, the dissolved oxygen in the local water body is rapidly consumed, causing the fish to lack oxygen and affecting the quality. By utilizing the above-mentioned mechanism, when water is sprayed into the net cage, it will drive the water in the net to circulate from the surface to the bottom, improve the mixing of high dissolved oxygen water and low dissolved oxygen water, increase the dissolved oxygen content in the water in the net, and reduce the problem of fish quality decline due to insufficient dissolved oxygen.

[0093] Using the operating mechanism of the above-mentioned mechanism, a limiting mechanism 2 is set up. Since the remaining fish are in a more sensitive state after the qualified target fish are captured, when the net is extended, the operating mechanism in the limiting mechanism 2 will limit the unfolding speed of the net 14, reducing the possibility of the fish being startled. At the same time, the protective mechanism 3 is used to ensure that the net 14 unfolds from the outside of the net cage to the inside, thereby reducing the probability of the fish coming into contact with the net 14, reducing the risk of injury to some fish due to being startled, and reducing the impact on aquaculture costs.

[0094] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A large-scale net cage harvesting device for yellowfin tuna aquaculture, comprising a floating platform (13), a net (14) fixedly connected to the outer wall of the floating platform (13), a plurality of motors (15) fixedly connected to the outer wall of the floating platform (13), and a plurality of winding devices (16) fixedly connected to the outer wall of the floating platform (13), characterized in that, Also includes: The driving mechanism (1) is fixedly installed on the outer wall of the net (14) and is used to drive away the fish when the net is pulled in. The limiting mechanism (2) is fixedly installed on the inner wall of the driving mechanism (1) and is used to restrict the movement in the driving mechanism (1) to a certain extent. The protective mechanism (3) is fixedly installed on the outer wall of the winding device (16) and is used to provide certain protection for the netting (14). A connecting ring (111) is fixedly connected to the outer wall of the mesh (14), a bottom ring (112) is fixedly connected to the outer wall of the mesh (14), and a plurality of connecting rods (113) are fixedly connected to the outer wall of the connecting ring (111). The outer wall of the motor (15) is fixedly connected to the inner wall of the winding device (16), the connecting ring (111) is located on the outside of the net box, the connecting rod (113) is located on the inside of the net (14), and the bottom ring (112) is fixed at the bottom of the net (14). The driving mechanism (1) includes: Support assembly (11), which is fixedly disposed on the outer wall of the connecting rod (113); The support assembly (11) includes a plurality of piston sleeves (114) fixedly connected to the outer wall of the connecting ring (111), and a plurality of piston sleeves (115) are fixedly connected to the outer wall of the connecting ring (111). The limiting mechanism (2) includes: A limiting component (21) is fixedly disposed on the inner wall of the driving component (12); The active component (22) is fixedly disposed on the inner wall of the limiting component (21); Among them, the limiting component (21) is used to restrict the movement of the driving component (12) to a certain extent, and some parts of the active component (22) move within the limiting component (21); The active component (22) includes a limiting ball (221) that is slidably connected to the inner wall of the piston cylinder (115), a limiting spring (222) that is fixedly connected to the inner wall of the piston cylinder (115), and a cable (223) that is fixedly connected to the outer wall of the winding device (16). The protective mechanism (3) includes: A protective component (31) is fixedly disposed on the outer wall of the connecting ring (111); The protective component (31) includes a limiting ring (313) fixedly connected to the winding device (16), a plurality of fixing rings (311) fixedly connected to the outer wall of the connecting ring (111), a plurality of fixing rods (312) fixedly connected to the outer wall of the bottom ring (112), and a plurality of limiting rings (313) fixedly connected to the outer wall of the floating platform (13).

2. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 1, characterized in that: The driving mechanism (1) also includes: A driving component (12) is fixedly disposed on the inner wall of the support component (11); The support component (11) is used to provide mounting positions and support for the components in the driving component (12).

3. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 2, characterized in that: The piston sleeve (114) and piston cylinder (115) are arranged between two adjacent connecting rings (111). The outer wall of the piston cylinder (115) is slidably connected to the inner wall of the piston sleeve (114). The piston sleeve (114) and piston cylinder (115) are filled with seawater.

4. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 3, characterized in that: The driving assembly (12) includes a piston rod (121) fixedly connected to the inner wall of the piston sleeve (114), a plurality of water outlet holes (122) are provided on the outer wall of the piston sleeve (114), a plurality of through grooves (123) are provided on the inner wall of the piston sleeve (114), and a plurality of water outlet holes (124) are provided on the outer wall of the piston cylinder (115). The through groove (123) allows the piston sleeve (114) to be connected to the outside.

5. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 4, characterized in that: The limiting component (21) includes a limiting ball (211) that is slidably connected to the inner wall of the piston sleeve (114), a return spring (212) that is fixedly connected to the inner wall of the piston sleeve (114), and a plurality of slots (213) that are opened on the inner wall of the piston cylinder (115). The slot (213) allows the piston cylinder (115) to communicate with the outside. Under the action of the return spring (212), the limiting ball (211) will stick to the inner wall of the piston sleeve (114) and block the piston sleeve (114).

6. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 1, characterized in that: Under the action of the limiting spring (222), the limiting ball (221) will stick to the inner wall of the piston cylinder (115) and block the piston cylinder (115). The outer wall of the fixing ring (311) away from the winding device (16) is fixedly connected to the fixing rod (312). The cable (223) passes through several fixing rings (311) and is fixedly connected to the inner wall of the fixing rod (312).

7. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 6, characterized in that: The protective assembly (31) also includes a plurality of sliding rings (321) slidably connected to the outer wall of the floating platform (13), and a rotating rod (322) is rotatably connected to the inner wall of the sliding ring (321), and a fixed pull rod (323) is rotatably connected to the inner wall of the rotating rod (322). The outer wall of the fixed tie rod (323) is fixedly connected to the outer wall of the mesh (14).

8. A method for harvesting yellowfin tuna in a large-scale net cage, using the apparatus described in claim 7, characterized in that: Includes the following steps, S1: Starting device: Start the motor (15) to drive the winding device (16) to begin shrinking the net (14); S2: Capture the target fish: After the net (14) has finished shrinking, use professional capture tools to capture the qualified target fish.

Images