A rotating selective trawl net for marine protected animals

Abstract

This invention relates to the field of marine conservation technology, specifically to a rotating selective trawl net for marine protected animals. The net includes a fishing vessel and a fixed net fixedly connected to the bottom of the vessel. A rotating net is rotatably fitted to one side of the fixed net. A discharge port is located at the end of the rotating net away from the fixed net, and a fixed ring is fixedly connected to the discharge port. An elastic net is fixedly connected inside the fixed ring, and the elastic net is equipped with an adjustment component for adjusting the mesh size of the elastic net. An interception component for intercepting large marine organisms is located inside the fixed net. This invention can effectively reduce the accidental catch rate during fishing operations and reduce the impact of fishing operations on the marine ecosystem.

Description

Technical Field

[0001] This invention relates to the field of marine conservation technology, specifically to a rotating selective trawl net for marine protected animals. Background Technology

[0002] With the advancement of science and technology, modern fishing techniques have developed rapidly, and large-scale, high-efficiency fishing equipment has been gradually applied to the marine commercial fishing industry, putting unprecedented pressure on fishery resources and causing them to face serious threats. Therefore, while ensuring fishing efficiency, significantly reducing the fishing of small and young marine organisms is a core technology that current marine conservation technologies emphasize.

[0003] In existing technologies, trawls are often used to selectively capture marine life. The mesh openings of the trawls allow small marine organisms to pass through, reducing the accidental capture rate of small marine organisms. However, because the mesh size of existing trawls is fixed, a large number of non-target organisms are still accidentally caught during the fishing process, which damages the marine ecosystem.

[0004] In summary, addressing the problem that existing trawls, due to their fixed mesh size, still result in the accidental capture of numerous non-target organisms during fishing, thus damaging the marine ecosystem, has become a pressing issue in this field. Therefore, it is necessary to propose a more efficient rotating selective trawl for marine protected animals. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a rotating selective trawler for marine protected animals. Through the design of adjustable components, the mesh size of the elastic net can be adjusted according to the size of the target organism during the fishing process, thereby reducing the accidental catch rate and minimizing damage to the marine ecosystem.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A rotating selective trawl net for marine protected animals includes a fishing boat and a fixed net fixedly connected to the bottom of the fishing boat. A rotating net is rotatably fitted on one side of the fixed net. A discharge port is opened at the end of the rotating net away from the fixed net. A fixed ring is fixedly connected at the discharge port. An elastic net is fixedly connected inside the fixed ring. An adjustment component for adjusting the mesh size of the elastic net is provided on the elastic net. An interception component for intercepting large marine organisms is provided inside the fixed net.

[0007] The adjustment assembly includes a controller and a base fixedly connected to the bottom wall of the rotating net. A double-headed drive is embedded in the base. An electromagnet is coaxially fixed to the output shaft of the double-headed drive near the fixed ring. A rotating rod is magnetically fixed to the side of the electromagnet away from the double-headed drive. A connecting frame is hinged to the end of the rotating rod away from the double-headed drive. Several hinge rods are hinged to the edge of the connecting frame. A central rod is fixedly connected to the end of each hinge rod away from the connecting frame. Each central rod passes through the fixed ring and rotates with it. A pull rope is fixedly connected to one of the central rods. The pull rope is wound around the elastic net in an S-shaped path. The end of the pull rope away from the elastic net is fixedly connected to the inner wall of the fixed ring. The controller is used to control the operation of the electromagnet and the double-headed drive, thereby driving the rotating rod to rotate.

[0008] The base is equipped with a piston assembly for adjusting the internal environment of the rotating mesh.

[0009] The technical principles of the above solution are as follows:

[0010] The electromagnet is activated by the controller, attracting the rotating rod. Then, the dual-head drive is activated, and its output shaft drives the rotating rod to rotate. The rotating rod, through the connecting frame, drives all the hinged rods to move synchronously, which in turn drives the central rod to rotate on the fixed ring. Because the pull rope is wound in an S-shaped path around the elastic net, when the central rod rotates, the pull rope is tightened or loosened by the central rod. When the pull rope tightens, the mesh size of the elastic net decreases; when the pull rope loosens, the mesh size of the elastic net increases due to its rebound.

[0011] The above approach has the following beneficial effects:

[0012] 1. Existing trawls, while reducing the accidental capture rate of small marine organisms through mesh design, still result in a large number of non-target organisms being accidentally caught during fishing due to their fixed mesh size, thus damaging the marine ecosystem. This invention, through the design of an elastic net and pull rope, allows operators to easily adjust the mesh size of the elastic net by controlling the operation of the dual-head drive unit and electromagnet via a controller. This enables selective interception and release of organisms of different sizes, effectively reducing the accidental capture rate of non-target organisms and minimizing the impact of fishing operations on the marine ecosystem.

[0013] 2. In this invention, the dual-head drive component rotates slowly, which reduces the risk of mechanical damage to organisms caused by the rotating rod, connecting frame, and hinge rod when they rotate. At the same time, the rotation of the rotating rod, connecting frame, and hinge rod also increases the flow of seawater within the rotating net, optimizing the internal environment of the rotating net.

[0014] 3. This invention utilizes an electromagnet design to selectively fix the rotating rod to the output shaft of the dual-head drive component. When the operator needs to adjust the mesh size of the elastic mesh, the electromagnet is controlled to move and attract and fix the rotating rod to the output shaft of the dual-head drive component. Once the mesh size of the elastic mesh is adjusted to a reasonable size, the electromagnet stops attracting, thus maintaining the mesh size of the elastic mesh at its current size; thereby ensuring the feasibility of the device operation.

[0015] Furthermore, the interception component includes an inclined plate fixedly connected within the fixed net, with several slots on the inclined plate for the target organism to pass through; an escape opening is opened at the top of the fixed net, an escape net is hinged to the escape opening, and a counterweight component is provided on the escape net to cover the escape opening; the escape opening is located above the inclined plate.

[0016] Beneficial effects: The synergistic design of the inclined plate and the escape net improves the selective capture capability of the fixed net. Small marine organisms can directly enter the rotating net through the slots on the inclined plate. When large marine organisms (such as sea turtles or dolphins) enter the fixed net, they will be blocked by the inclined plate due to their large size and will not be able to pass through the slots, thus being effectively isolated. At the same time, due to the guiding effect of the inclined plate, large marine organisms will swim towards the escape opening and push open the escape net, thus escaping from the fixed net.

[0017] Furthermore, the counterweight assembly includes connecting ropes fixedly connected to both sides of the escape net, with a counterweight block fixedly connected to the end of each connecting rope away from the escape net.

[0018] Beneficial effects: By connecting the counterweight to the escape net with a connecting rope, the escape net will be stably attached to the escape opening due to the gravity generated by the counterweight. Furthermore, since the impact force of large marine life swimming is much greater than that of small marine life swimming, large marine life can overcome the gravity of the counterweight, push open the escape net, and thus escape from the fixed net. However, small marine life cannot overcome the gravity of the counterweight and therefore cannot escape, thus improving the selective capture capability of the fixed net.

[0019] Furthermore, an air storage ring for storing air is fixedly fitted outside the rotating net.

[0020] Beneficial effects: The air storage ring can store a large amount of air. Since the density of air is less than that of seawater, the air storage ring generates buoyancy, which balances the weight of the various components in the rotating net, thereby maintaining the balance between the rotating net and the fixed net. This ensures that the opening direction at the front end of the fixed net is as parallel as possible to the direction of movement of the fishing boat, thus improving fishing efficiency.

[0021] Furthermore, the piston assembly includes a piston box, which is fixedly connected to the base on the side away from the fixed ring. A piston plate is vertically slidably fitted inside the piston box. A connecting rod is coaxially fixedly connected to the output shaft of the dual-head drive unit on the side away from the electromagnet. A piston rod is hinged to the bottom of the connecting rod, and the bottom of the piston rod is hinged to the top of the piston plate. A piston groove for the piston rod to move is opened on the top of the piston box. A first one-way valve is connected to the lower side wall of the piston box. The controller is used to control the operation of the first one-way valve, thereby supplying air into the rotating mesh.

[0022] Beneficial effects: Keeping the first one-way valve open, when the dual-head drive unit is running, its output shaft will also drive the connecting rod to rotate, which in turn drives the piston rod and piston plate to slide vertically in the piston box, thereby delivering the air in the piston box to the inside of the rotating net through the first one-way valve; in traditional trawl operations, since the volume of the trawl net is fixed, the organisms in the trawl net may die from lack of oxygen; through the design of the piston box, the air in the rotating net can be effectively replenished, avoiding oxygen deficiency in marine organisms.

[0023] Furthermore, the lower part of the piston box is connected to the gas storage ring, and a second check valve is connected at the connection point between the two; the controller is used to control the operation of the second check valve, thereby supplying air into the piston box.

[0024] Beneficial effects: By keeping the second one-way valve open, when the rotating rod drives the piston rod and piston plate to slide vertically in the piston box, the air inside the air storage ring will flow into the piston box through the second one-way valve, replenishing the air in the piston box and thus providing oxygen to marine life for a long time. At the same time, the longer the fishing time, the more marine life will be inside the rotating net. At this time, the air consumption in the air storage ring will be greater, and the supporting force of the air storage ring on the rotating net will be smaller. At this time, the rotating net will sink due to the weight of the marine life inside and outside and the weight of various components, and the opening at the front end of the fixed net will rise, thereby reducing the fishing efficiency and avoiding overloading.

[0025] Furthermore, a baffle is hinged to the inner wall of the rotating net near the fixed net; an air bladder is provided on the bottom wall of the rotating net to support the baffle, the air bladder is connected to the piston box, and a third check valve is connected at the connection point between the two; the controller is used to control the operation of the third check valve, thereby supplying air to the air bladder.

[0026] Beneficial effects: Once the catch is sufficient, the operator can close the first one-way valve via the controller, while keeping the second and third one-way valves open. Simultaneously, the dual-head drive unit is activated, causing its output shaft to rotate the rotating rod. When the rotating rod drives the piston rod and piston plate to slide vertically within the piston box, the piston box draws air from the air storage ring through the second one-way valve and delivers air from the piston box to the air bladder through the third one-way valve. As the air bladder expands, the baffle gradually rotates from a horizontal to a vertical position, thus sealing the rotating net and preventing the target organisms from escaping. It also prevents marine life from continuing to enter the rotating net, causing it to overload, thereby ensuring that the marine life within the rotating net has sufficient space to move around and improving their comfort.

[0027] Furthermore, a limiting block is fixedly connected to the top wall of the rotating net to limit the rotation angle of the baffle.

[0028] Beneficial effects: When the rotating net rotates to a vertical position, the limiting block will limit the baffle to prevent it from continuing to rotate and prevent the baffle from failing to block. When the baffle is in a vertical position, the baffle covers the rotating net to the maximum extent, which can prevent the target creature from escaping to the greatest extent.

[0029] Furthermore, several fan blades are fixedly connected to the end of the central rod away from the hinge rod.

[0030] Beneficial effects: When the central rod rotates, the fan blades also rotate, which in turn accelerates the flow of seawater around the rotating net, and the resulting induced current guides non-target organisms to escape through the elastic net.

[0031] Furthermore, a protective tube for preventing the fan blades from injuring marine life is fixedly connected to the side of the fixing ring away from the hinge rod, and the protective tube has a connecting groove for the movement of the pull rope.

[0032] Beneficial effects: When marine life escapes from the elastic net, it can safely enter the ocean through the protective tube, which prevents the marine life from being injured when the fan blades rotate; the design of the connecting groove ensures that the protective tube will not affect the normal movement of the pull rope, and ensures that the mesh size of the elastic net can be adjusted normally.

[0033] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0034] Figure 1 This is a side view of the rotating selective trawl net device for marine protected animals according to the present invention.

[0035] Figure 2 This is a side sectional view of the rotating selective trawl net device for marine protected animals of the present invention.

[0036] Figure 3 This is an isometric view of the adjustment component in the rotating selective trawl net for marine protected animals of the present invention.

[0037] Figure 4 This is a front view of the elastic net in the rotating selective trawl netting device for marine protected animals of the present invention.

[0038] Figure 5 This is an isometric view of the inclined plate in the rotating selective trawl netting device for marine protected animals of the present invention.

[0039] The reference numerals in the accompanying drawings of the instruction manual include: 1. Fixed net; 2. Rotating net; 3. Fixed ring; 4. Elastic net; 5. Base; 6. Dual-head motor; 7. Rotating rod; 8. Connecting frame; 9. Hinge rod; 10. Center rod; 11. Pull rope; 12. Inclined plate; 13. Escape net; 14. Connecting rope; 15. Counterweight; 16. Air storage ring; 17. Piston box; 18. Protective tube; 19. Connecting rod; 20. Piston rod; 21. First one-way valve; 22. Second one-way valve; 23. Baffle; 24. Airbag; 25. Third one-way valve; 26. Limiting block; 27. Fan blade. Detailed Implementation

[0040] The following detailed description illustrates the specific implementation method:

[0041] Example 1:

[0042] As attached Figures 1-5 As shown: A rotating selective trawl net for marine protected animals includes a fishing boat and a fixed net 1 attached to the bottom of the fishing boat. A rotating net 2 is rotatably fitted on one side of the fixed net 1. The rotating net 2 has a discharge port at the end away from the fixed net 1. A fixed ring 3 is fixedly glued to the discharge port. An elastic net 4 is fixedly glued inside the fixed ring 3. The elastic net 4 is provided with an adjustment component for adjusting the mesh size of the elastic net 4. An interception component for intercepting large marine organisms is provided inside the fixed net 1.

[0043] Because the fixed net 1 and the rotating net 2 rotate in coordination, the rotating net 2 can adaptively deflect according to the water flow resistance, thereby reducing the overall resistance of the device.

[0044] The adjustment assembly includes a controller and a base 5 fixedly bonded to the bottom wall of the rotating net 2. A dual-head drive unit is embedded in the base 5. In this embodiment, the dual-head drive unit is a dual-head motor 6. Figure 2 and Figure 3As shown, an electromagnet is coaxially bolted to the right output shaft of the dual-head motor 6, and a rotating rod 7 is attracted and fixed to the right side of the electromagnet; a connecting frame 8 is hinged to the end of the rotating rod 7 away from the dual-head motor 6, and several hinge rods 9 are hinged to the edge of the connecting frame 8; a center rod 10 is welded to the end of each hinge rod 9 away from the connecting frame 8, and each center rod 10 passes through the fixing ring 3 and is rotatably engaged with it; as Figure 4 As shown, a pull rope 11 is fixedly bonded to one of the central rods 10. The pull rope 11 is wound around the elastic net 4 in an S-shaped path. The end of the pull rope 11 away from the elastic net 4 is fixedly bonded to the inner wall of the fixed ring 3. The controller is used to control the operation of the electromagnet and the double-headed motor 6, thereby driving the rotating rod 7 to rotate.

[0045] In this embodiment, the dual-head motor 6 rotates slowly, which reduces the risk of mechanical damage to organisms caused by the rotating rod 7, connecting frame 8, and hinge rod 9 when they rotate. At the same time, the rotation of the rotating rod 7, connecting frame 8, and hinge rod 9 also increases the flow of seawater in the rotating net 2, optimizing the internal environment of the rotating net 2.

[0046] When the operator activates the electromagnet via the controller, the electromagnet attracts the rotating rod 7. At this time, the dual-head motor 6 is activated, and the output shaft of the dual-head motor 6 drives the rotating rod 7 to rotate. Since the rotating rod 7 is hinged to the connecting frame 8, and the connecting frame 8 is hinged to the hinge rod 9, the rotating rod 7 drives all the hinge rods 9 to move synchronously through the connecting frame 8. Since the central rod 10 is rotated and engaged with the fixed ring 3, the hinge rod 9 drives the central rod 10 to rotate on the fixed ring 3. Since the pull rope 11 is wound around the elastic net 4 in an S-shaped path, when the central rod 10 rotates, the pull rope 11 will be tightened or loosened by the central rod 10. When the pull rope 11 is tightened, it will compress the elastic net 4, thereby reducing the mesh size of the elastic net 4. When the pull rope 11 is loosened, as the compression of the pull rope 11 gradually decreases, the elastic net 4 will gradually rebound, and the mesh size of the elastic net 4 will increase. Thus, the mesh size of the elastic net 4 can be freely adjusted.

[0047] Once the mesh size of the elastic mesh 4 is adjusted, the electromagnet can be stopped by the controller, so that the mesh size of the elastic mesh 4 remains at its current size.

[0048] like Figure 1 , Figure 2 and Figure 5 As shown, the interception assembly includes an inclined plate 12 fixedly attached to the fixed net 1, the inclined plate 12 having several slots for the target organism to pass through; an escape opening is opened at the top of the fixed net 1, an escape net 13 is hinged to the escape opening, and the escape net 13 is provided with a counterweight assembly for covering the escape opening; the escape opening is located above the inclined plate 12.

[0049] Small marine life can directly enter the rotating net 2 through the slots on the inclined plate 12. When large marine life (such as sea turtles or dolphins) and protected animals not intended for capture (such as horseshoe crabs) enter the fixed net 1, their larger size will prevent them from passing through the slots, thus effectively isolating them. Simultaneously, because the inclined plate 12 is tilted and the escape hatch is located above it, the inclined plate 12 acts as a guide, leading large marine life to swim towards the escape hatch and push open the escape net 13, thereby escaping the fixed net 1. The coordinated design of the inclined plate 12 and the escape net 13 improves the selective capture capability of the fixed net 1.

[0050] The counterweight assembly includes connecting ropes 14 fixedly attached to both sides of the escape net 13, with counterweight blocks 15 tied to the ends of the connecting ropes 14 away from the escape net 13. The counterweight blocks 15 are fixed to the escape net 13 via the connecting ropes 14. Due to the gravity generated by the counterweight blocks 15, the escape net 13 will be stably attached to the escape opening. Furthermore, since the impact force of large marine life swimming is much greater than that of small marine life swimming, large marine life can overcome the gravity of the counterweight blocks 15, push open the escape net 13, and thus escape from the fixed net 1; however, small marine life cannot overcome the gravity of the counterweight blocks 15 and therefore cannot escape, thus further improving the selective capture capability of the fixed net 1.

[0051] A piston assembly for adjusting the internal environment of the rotating mesh 2 is provided on the base 5. The piston assembly includes a piston box 17, which stores air. The piston box 17 is welded to the side of the base 5 away from the fixed ring 3. A piston plate is vertically slidably fitted inside the piston box 17. A connecting rod 19 is coaxially bolted to the output shaft of the dual-head motor 6 away from the electromagnet. A piston rod 20 is hinged to the bottom of the connecting rod 19. The bottom of the piston rod 20 is hinged to the top of the piston plate. A piston groove for the piston rod 20 to move is opened on the top of the piston box 17. A first one-way valve 21 is connected to the lower side wall of the piston box 17. A controller is used to control the operation of the first one-way valve 21, thereby supplying air into the rotating mesh 2.

[0052] When the dual-head motor 6 is running, its output shaft will also drive the connecting rod 19 to rotate, which in turn drives the piston rod 20 and the piston plate to slide vertically in the piston box 17. At this time, the controller opens the first one-way valve 21, and the air in the piston box 17 will be delivered to the rotating net 2 through the first one-way valve 21. In traditional trawl operations, due to the fixed volume of the trawl net and insufficient seawater flow in the trawl net, the oxygen content in the trawl net is insufficient, and the organisms in the trawl net may die from lack of oxygen. Through the design of the piston box 17, the air in the rotating net 2 can be effectively replenished, avoiding oxygen deficiency in marine organisms.

[0053] The lower part of the piston box 17 is connected to the air storage ring 16, and a second one-way valve 22 is connected at the connection point between the two; the controller is used to control the operation of the second one-way valve 22, thereby supplying air into the piston box 17.

[0054] A baffle 23 is hinged to the inner wall of the rotating net 2 near the fixed net 1; an air bladder 24 is provided on the inner bottom wall of the rotating net 2 to support the baffle 23. The air bladder 24 is connected to the piston box 17, and a third one-way valve 25 is connected at the connection point between the two. The controller is used to control the operation of the third one-way valve 25, thereby supplying air to the air bladder 24.

[0055] A limiting block 26 is fixedly bonded to the inner top wall of the rotating net 2 to limit the rotation angle of the baffle 23.

[0056] The specific implementation process is as follows: In the initial state, the rope 11 is in a relaxed state, and the mesh size of the elastic net 4 is at its largest at this time; after the operator selects the target organism, the mesh size of the elastic net 4 is adjusted according to the average size of the target organism.

[0057] by Figure 2 For example, the adjustment process is as follows: the electromagnet and the double-headed motor 6 are started by the controller. The electromagnet fixes the right output shaft of the double-headed motor 6 and the rotating rod 7 with magnetic force. The right output shaft of the double-headed motor 6 drives the rotating rod 7 to rotate coaxially. Through the transmission of the connecting frame 8 and the hinge rod 9, the central rod 10 is driven to rotate, so that the pull rope 11 is contracted by the central rod 10, reducing the mesh size of the elastic net 4. When the mesh size of the elastic net 4 is reduced to 60% of the average size of the target organism (which can be adjusted according to actual needs), the electromagnet can be stopped by the controller, so that the mesh size of the elastic net 4 remains at its current size.

[0058] In this embodiment, assuming the average diameter of the target organism (in this embodiment, the diameter refers to the maximum lateral straight-line distance from the center point of the organism) is about 12cm, the mesh size of the elastic net 4 can be maintained at about 7.2cm. Other protected animals that are not the target organisms (such as seahorses, with an average diameter of about 3cm) with a diameter less than 7.2cm can pass through the mesh size of the elastic net 4 smoothly, avoiding being accidentally caught.

[0059] After the mesh size of the elastic net 4 is adjusted, the fishing boat is started, which moves the fixed net 1 and the rotating net 2 in the ocean to begin the fishing operation.

[0060] In this embodiment, assuming the average width of the target organism is 5cm, the width of the slot can be set to 6cm (which can be adjusted according to actual needs, and should be slightly larger than the average width of the target organism). During the harvesting process, marine organisms with a width greater than 6cm will have difficulty passing through the slot on the inclined plate 12, thereby effectively preventing marine organisms much larger than the target organism from entering the rotating net 2.

[0061] Meanwhile, during the harvesting process, the dual-head motor 6 is kept running. The output shaft on the left side of the dual-head motor 6 drives the connecting rod 19 to rotate, which in turn drives the piston rod 20 and the piston plate to slide vertically in the piston box 17. The controller keeps the first one-way valve 21 and the second one-way valve 22 open. When the piston plate moves upward, it will draw air from the air storage ring 16 through the second one-way valve 22. When the piston plate moves downward, it will pump the air in the piston box 17 into the rotating net 2, thereby supplying oxygen to the organisms in the rotating net 2.

[0062] Initially, baffle 23 is horizontal. Once the catch is sufficient, the operator can close the first one-way valve 21 via the controller, while keeping the second one-way valve 22 and the third one-way valve 25 open. Simultaneously, the dual-head motor 6 is started, causing its output shaft to drive the rotating rod 7 to rotate. When the rotating rod 7 drives the piston rod 20 and piston plate to slide vertically within the piston box 17, the piston box 17 will draw air from the air storage ring 16 through the second one-way valve 22 and deliver air from the piston box 17 to the air bladder 24 through the third one-way valve 25. As the air bladder 24 expands, baffle 23 will gradually rotate from a horizontal state to a vertical state, thereby sealing the rotating net 2 and preventing the target organisms from escaping. It also prevents marine organisms from continuing to enter the rotating net 2, causing the rotating net 2 to overload, thus ensuring that the marine organisms within the rotating net 2 have sufficient space to move around and improving their comfort.

[0063] When the rotating net 2 rotates to a vertical position, the limiting block 26 will limit the baffle 23 to prevent the baffle 23 from continuing to rotate and to prevent the blocking effect of the baffle 23 from failing. When the baffle 23 is in a vertical position, the baffle 23 covers the rotating net 2 to the maximum extent, which can prevent the target creature from escaping to the greatest extent.

[0064] While existing trawls can reduce the accidental capture rate of small marine organisms through their mesh design, the fixed mesh size still leads to the accidental capture of a large number of non-target organisms during fishing, damaging the marine ecosystem. This invention, through the design of the elastic net 4 and the pull rope 11, allows operators to easily adjust the mesh size of the elastic net 4 by controlling the operation of the dual-head motor 6 and electromagnet via a controller. This enables selective interception and release of organisms of different sizes, effectively reducing the accidental capture rate of non-target organisms and minimizing the impact of fishing operations on the marine ecosystem.

[0065] Example 2:

[0066] As attached Figures 1-3 As shown, unlike the above embodiment, the central rod 10 is welded with fan blades 27 at the end away from the hinge rod 9.

[0067] The specific implementation process is as follows: When the central rod 10 rotates, the fan blade 27 will also rotate, which will accelerate the flow of seawater around the rotating net 2, and the resulting induced water flow will guide non-target organisms to escape through the elastic net 4.

[0068] Example 3:

[0069] As attached Figure 1-3 As shown, unlike the above embodiment, the fixed ring 3 is fixedly bonded to the side away from the hinge rod 9 with a protective tube 18 for preventing the fan blade 27 from injuring marine life. The protective tube 18 has a connecting groove for the pull rope 11 to move.

[0070] The specific implementation process is as follows: When marine life escapes from the elastic net 4, it can safely enter the ocean through the protective tube 18. The protective tube 18 prevents the marine life from being injured when the fan blade 27 rotates. The design of the connecting groove ensures that the protective tube 18 will not affect the normal movement of the pull rope 11, and ensures that the mesh adjustment of the elastic net 4 can be carried out normally.

[0071] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A rotating selective trawl net for marine protected animals, comprising a fishing vessel and a fixed net (1) fixedly connected to the bottom of the fishing vessel, characterized in that, A rotating net (2) is rotatably fitted on one side of the fixed net (1). The rotating net (2) has a discharge port at the end away from the fixed net (1). A fixed ring (3) is fixedly connected at the discharge port. An elastic net (4) is fixedly connected inside the fixed ring (3). An adjustment component for adjusting the mesh size of the elastic net (4) is provided on the elastic net (4). An interception component for intercepting large marine organisms is provided inside the fixed net (1). The adjustment assembly includes a controller and a base (5) fixedly connected to the inner bottom wall of the rotating net (2). A double-headed drive is embedded in the base (5). An electromagnet is coaxially fixed to the output shaft of the double-headed drive near the fixed ring (3). A rotating rod (7) is magnetically fixed to the side of the electromagnet away from the double-headed drive. A connecting frame (8) is hinged to the end of the rotating rod (7) away from the double-headed drive. Several hinge rods (9) are hinged to the edge of the connecting frame (8). A center rod (10) is fixedly connected to the end of each hinge rod (9) away from the connecting frame (8). The center rods (10) all pass through the fixed ring (3) and rotate with it. A pull rope (11) is fixedly connected to one of the center rods (10). The pull rope (11) is wound around the elastic net (4) in an S-shaped path. The end of the pull rope (11) away from the elastic net (4) is fixedly connected to the inner side wall of the fixed ring (3). The controller is used to control the operation of the electromagnet and the double-headed drive, thereby driving the rotating rod (7) to rotate. The base (5) is equipped with a piston assembly for adjusting the internal environment of the rotating net (2).

2. The rotating selective trawl netting equipment for marine protected animals according to claim 1, characterized in that, The interception assembly includes an inclined plate (12) fixedly connected to the fixed net (1), the inclined plate (12) having several slots for the target organism to pass through; an escape opening is opened at the top of the fixed net (1), an escape net (13) is hinged at the escape opening, and a counterweight assembly is provided on the escape net (13) for covering the escape opening; the escape opening is located above the inclined plate (12).

3. The rotating selective trawl netting equipment for marine protected animals according to claim 2, characterized in that, The counterweight assembly includes connecting ropes (14) fixedly connected to both sides of the escape net (13), and counterweight blocks (15) are fixedly connected to the end of the connecting ropes (14) away from the escape net (13).

4. The rotating selective trawl netting equipment for marine protected animals according to claim 3, characterized in that, The rotating net (2) is fixedly fitted with an air storage ring (16) for storing air.

5. The rotating selective trawler for marine protected animals according to claim 4, characterized in that, The piston assembly includes a piston box (17), which is fixedly connected to the base (5) on the side away from the fixed ring (3). A piston plate is vertically slidably fitted inside the piston box (17). A connecting rod (19) is coaxially fixedly connected to the output shaft of the dual-head drive on the side away from the electromagnet. A piston rod (20) is hinged to the bottom of the connecting rod (19). The bottom of the piston rod (20) is hinged to the top of the piston plate. A piston groove for the piston rod (20) to move is opened on the top of the piston box (17). A first one-way valve (21) is connected to the lower side wall of the piston box (17). The controller is used to control the operation of the first one-way valve (21) and thus deliver air into the rotating mesh (2).

6. The rotating selective trawl netting equipment for marine protected animals according to claim 5, characterized in that, The lower part of the piston box (17) is connected to the gas storage ring (16), and a second check valve (22) is connected at the connection point between the two. The controller is used to control the operation of the second check valve (22) to deliver air into the piston box (17).

7. The rotating selective trawl netting equipment for marine protected animals according to claim 6, characterized in that, A baffle (23) is hinged to the inner wall of the rotating net (2) near the fixed net (1); an air bladder (24) is provided on the inner bottom wall of the rotating net (2) to support the baffle (23). The air bladder (24) is connected to the piston box (17), and a third check valve (25) is connected at the connection between the two. The controller is used to control the operation of the third check valve (25) to deliver air to the air bladder (24).

8. The rotating selective trawl netting equipment for marine protected animals according to claim 7, characterized in that, The inner top wall of the rotating net (2) is fixedly connected with a limiting block (26) for limiting the rotation angle of the baffle (23).

9. The rotating selective trawl netting equipment for marine protected animals according to claim 8, characterized in that, Several fan blades (27) are fixedly connected to the end of the central rod (10) away from the hinge rod (9).

10. The rotating selective trawler for marine protected animals according to claim 9, characterized in that, The fixed ring (3) is fixedly connected to a protective tube (18) on the side away from the hinge rod (9) to prevent the fan blade (27) from injuring marine life. The protective tube (18) has a connecting groove for the pull rope (11) to move.

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