A large net cage fishing device and fishing method for yellowfin tuna aquaculture

Abstract

This invention relates to the field of cage fishing equipment technology, and discloses a large-scale cage fishing equipment and method for yellowfin tuna farming. It includes a piston rod fixedly connected to the inner wall of a piston sleeve, several water outlet holes on the outer wall of the piston sleeve, several through grooves on the inner wall of the piston sleeve, and several water outlet holes on the outer wall of the piston cylinder. When the bottom ring moves to the connecting ring, it will drive the connecting ring to move together. At this time, as the connecting ring moves, the two lowest adjacent connecting rings will approach each other. Simultaneously, the piston sleeve and piston cylinder located between the two adjacent connecting rings will also approach each other. When the piston cylinder and piston sleeve approach each other, the piston cylinder will discharge seawater from the piston sleeve through the water outlet holes. The piston rod located inside the piston sleeve will also discharge seawater accumulated in the piston cylinder through the water outlet holes when the piston sleeve and piston cylinder approach each other.

Description

Technical Field

[0001] This invention relates to the field of cage fishing equipment technology, specifically to a large-scale cage fishing equipment and method for yellowfin tuna farming. Background Technology

[0002] Yellowfin tuna, a high-end marine fish known for its firm, tender flesh and exceptional nutritional value, is rich in polyunsaturated fatty acids such as EPA and DHA. It is highly favored by consumers worldwide and is an important ingredient in raw food cuisine, possessing broad market prospects and significant economic value. Unlike conventionally farmed marine fish, yellowfin tuna exhibits unique biological characteristics: it is a mid-to-upper-level migratory fish with fast swimming speed and strong activity. Its gill muscles are degenerate, requiring continuous swimming to ensure oxygen supply to the gills; ceasing to swim easily leads to oxygen deprivation and death. Simultaneously, its thin and fragile epidermis is easily damaged by collisions and friction. Environmental changes or improper fishing practices can trigger severe stress responses, leading to decreased fish quality, increased mortality, and significantly reduced economic benefits of aquaculture. Furthermore, with the continuous expansion of aquaculture scale and the increasingly widespread application of large net cages, the traditional small net cage fishing methods can no longer meet the fishing needs of large net cages. Therefore, the development of fishing devices and methods that are compatible with large net cages and take into account both fishing efficiency and fish quality has become a key supporting technology for the large-scale farming of yellowfin tuna and an urgent need for industrial development.

[0003] In practical use, when retracting the net to catch yellowfin tuna, the nets overlap and intertwine after retracting, which may cause damage when the nets are re-unrolled. At the same time, the nets may enter the net cage under the action of water flow. This can cause the nets inside the net cage to become entangled with the fish, resulting in damage to the net cage and the fish, affecting the fishing efficiency and cost. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a large-scale net cage harvesting device for yellowfin tuna aquaculture, including a floating platform, a net fixedly connected to the outer wall of the floating platform, several motors fixedly connected to the outer wall of the floating platform, several winding devices fixedly connected to the outer wall of the floating platform, and further including:

[0005] The fish-driving mechanism is fixedly installed on the outer wall of the net and is used to drive the fish away when the net is pulled in.

[0006] The limiting mechanism is fixedly installed on the inner wall of the driving mechanism and is used to restrict the movement within the driving mechanism.

[0007] The protective mechanism is fixedly installed on the outer wall of the winding device and is used to provide a certain degree of protection for the netting.

[0008] A connecting ring is fixedly connected to the outer wall of the mesh, a bottom ring is fixedly connected to the outer wall of the mesh, and several connecting rods are fixedly connected to the outer wall of the connecting ring.

[0009] The outer wall of the motor is fixedly connected to the inner wall of the winding device, the connecting ring is located on the outside of the wire mesh box, the connecting rod is located on the inside of the wire mesh, and the bottom ring is fixed at the bottom of the wire mesh.

[0010] Preferably, the driving mechanism includes:

[0011] A support assembly is fixedly installed on the outer wall of the connecting rod.

[0012] The driving component is fixedly installed on the inner wall of the support component;

[0013] The support component is used to provide mounting positions and support for the parts in the driving component.

[0014] Preferably, the limiting mechanism includes:

[0015] The limiting component is fixedly installed on the inner wall of the driving component;

[0016] The active component is fixedly installed on the inner wall of the limiting component;

[0017] The limiting component is used to restrict the movement of the driving component, and some parts of the active component move within the limiting component.

[0018] Preferably, the protective mechanism includes:

[0019] A protective component is fixedly installed on the outer wall of the connecting ring.

[0020] The protective assembly includes a limiting ring fixedly connected to the winding device, several fixing rings fixedly connected to the outer wall of the connecting ring, several fixing rods fixedly connected to the outer wall of the bottom ring, and several limiting rings fixedly connected to the outer wall of the floating platform.

[0021] When in use, when it is necessary to catch farmed yellowfin tuna, first start the motor, so that the motor drives the winding device to wind the cable, so that the cable is wound in the winding device. When the cable is driven by the winding device, it will drive the fixing rod to move towards the floating platform. The movement of the fixing rod will drive the bottom ring to move together, and the movement of the bottom ring will cause the net to begin to contract from bottom to top.

[0022] Preferably, the support assembly includes 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 to a plurality of piston sleeves.

[0023] Preferably, the driving assembly includes a piston rod fixedly connected to the inner wall of the piston sleeve, a plurality of water outlet holes are provided on the outer wall of the piston sleeve, a plurality of through grooves are provided on the inner wall of the piston sleeve, and a plurality of water outlet holes are provided on the outer wall of the piston sleeve.

[0024] When the net is fully contracted, specialized fishing tools are used to catch the target fish. After the catch is complete, the motor is started, which drives the winding device to release the cable. The net will sink to the bottom under its own weight, causing the net to begin to extend. As it moves further, the connecting ring will also gradually sink. Before the connecting ring sinks, the piston sleeve and piston cylinder have already contracted. However, due to the action of the water outlet and water outlet two, seawater will enter the space between the piston cylinder, piston sleeve and piston rod through the two. When the connecting ring begins to move away from each other, it will cause the piston sleeve and piston cylinder to move away from each other as well. At this time, the seawater in the space between the piston sleeve, piston cylinder and piston rod will be discharged through the water outlet and water outlet two.

[0025] Preferably, the limiting component includes a limiting ball slidably connected to the inner wall of the piston sleeve, a return spring fixedly connected to the inner wall of the piston sleeve, and a plurality of slots opened on the inner wall of the piston sleeve.

[0026] When the piston sleeve and piston cylinder move away from each other, seawater will enter the piston sleeve and piston cylinder through some of the water outlet holes and water outlet hole two. However, at this time, the tension between the piston sleeve and piston cylinder is large when they move away from each other, which makes the negative pressure on the side of the piston sleeve and piston cylinder near the limiting ball and limiting ball two higher. This causes the water outlet holes and water outlet hole two on the side near the limiting ball and limiting ball two to be unable to meet the water intake. At this time, under the action of negative pressure, the limiting ball and limiting ball two will move towards the return spring and the limiting spring, and compress the return spring and the limiting spring. As the limiting ball and limiting ball two move, the piston sleeve and piston cylinder will be connected to the outside seawater through the through groove and the groove opening, thereby increasing the water intake.

[0027] When the bottom ring moves to the connecting ring, it will move the connecting ring together. At this time, as the connecting ring moves, the two adjacent connecting rings at the bottom will move closer to each other. At this time, the piston sleeve and piston cylinder set between the two adjacent connecting rings will also move closer to each other. When the piston cylinder and piston sleeve move closer to each other, the piston cylinder will discharge the seawater in the piston sleeve through the water outlet hole. The piston rod set inside the piston sleeve will also discharge the seawater accumulated in the piston cylinder through the second water outlet hole when the piston sleeve and piston cylinder move closer to each other. During this process, the limiting ball and the second limiting ball will be pressed tightly against the inner wall of the piston sleeve and piston cylinder under the action of the return spring, the limiting spring and the seawater.

[0028] Preferably, the movable component includes a limiting ball 2 slidably connected to the inner wall of the piston cylinder, a limiting spring fixedly connected to the inner wall of the piston cylinder, and a cable fixedly connected to the outer wall of the winding device.

[0029] Preferably, the protective assembly further includes several sliding rings slidably connected to the outer wall of the floating platform, with a rotating rod rotatably connected to the inner wall of the sliding rings, and a fixed tie rod rotatably connected to the inner wall of the rotating rod.

[0030] When the winding device winds up the cable, the netting between two adjacent connecting rings will overlap and wrinkle due to the loss of tension from the connecting rings. At the same time, when the netting overlaps, seawater may enter the cage due to factors such as the movement of seawater. At this time, since the fixed tie rod is fixed to the netting between the two adjacent connecting rings, as the connecting ring near the bottom of the cage rises, when it passes the fixed tie rod and continues to rise, the fixed tie rod will apply a certain tension to the netting under the action of the rotating rod and the sliding ring. At the same time, as the connecting ring rises, the sliding ring, the rotating rod, and the fixed tie rod will rotate relative to each other. The sliding ring will also be driven to rise along with it. When the sliding ring moves to the limiting ring, it will be restricted and unable to move. After the connecting ring continues to move, the sliding ring will cause the rotating rod to pull the fixed tie rod, applying tension to the netting, thereby pulling the loose netting out from between the two adjacent connecting rings.

[0031] A method for harvesting yellowfin tuna in a large net cage, comprising the following steps:

[0032] S1: Starting device: Start the motor to drive the winding device to begin shrinking the netting;

[0033] S2: Capture the target fish: After the net is retracted, use professional capture tools to capture the qualified target fish.

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

[0035] (1) In this invention, most devices do not restrict the shape of the net when shrinking it, which leads to some net entering the net cage. When catching fish, this part of the net will get tangled with the fish, causing damage to the fish and resulting in losses. At this time, the protective mechanism pulls the net outside the net cage when shrinking it, reducing the contact between the net and the fish and reducing the probability of fish being injured.

[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 to Figure 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). 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).

2. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 1, 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.

3. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 2, 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.

4. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 3, 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).

5. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 4, 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).

6. The large-scale net cage harvesting device for yellowfin tuna aquaculture according to claim 5, 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 rings (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).

7. A method for harvesting yellowfin tuna in a large-scale net cage, using the apparatus described in claim 6, 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.

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