Reducing-adjustable net cage catching device and using method thereof

Abstract

The invention discloses an adjustable and variable-diameter net cage catching device and a using method thereof. The device comprises a floating platform, a netting, a flaring component, a net skirt and a bottom net component, and the lower portion of the netting is of an externally-expanded horn mouth structure; the flaring part is mounted between the netting and the netting skirt, and is provided with a plurality of cylinder parts which are arranged at intervals in the circumferential direction, and corrugated pipes connected among the cylinder parts; the barrel part is provided with a first barrel and a second barrel which are rotationally connected with each other, and when water is injected into or drained from the corrugated pipe, the corrugated pipe can correspondingly extend and contract; the bottom net component is linked with the net skirt through the traction component, so that the bottom net component and the net skirt can get close to each other and get away from each other, and after the bottom net component makes contact with the net skirt, the bottom net component and the net skirt synchronously move upwards. The fish inlet and the fish catching space are adjusted, different catching requirements are met, the fish inlet space is rapidly closed, fish escape is avoided, the catching efficiency is improved, fishes can be gathered from bottom to top, unified collection operation is facilitated, and the fish damage rate is reduced.

Description

Technical Field

[0001] The invention relates to a catching technology, belongs to the field of marine fisheries, and particularly relates to a diameter-adjustable net cage catching device and a use method thereof. Background Art

[0002] Deep-sea cage aquaculture is a deep-sea aquaculture facility composed of a frame structure and a net. It has obvious advantages in expanding aquaculture areas, reducing coastal aquaculture pressure, improving the quality of farmed fish, and increasing aquaculture benefits. Taking gravity cages as an example, their main structure is the net, buoys, anchor chains and bottom counterweights. The buoys can provide buoyancy, and the anchor chains and bottom counterweights are fixed, so that the net forms a certain aquaculture space.

[0003] The structure and size of the cages need to be predetermined based on the sea conditions of the aquaculture area, the species, size, and quantity of the aquacultured fish. Furthermore, due to the cages' own structure and size, they are unable to catch the aquacultured fish themselves. Traditional methods of catching fish with cages, such as trawls and purse seines, not only have difficulties gathering fish, low catching efficiency, and high fish loss rates, but also during the catching process, the catching equipment can easily come into contact with or rub against the cage netting, causing damage to the netting and leading to the escape of the aquacultured fish.

[0004] There are also methods of placing a lifting fish collecting device in the cage for catching fish, such as the Chinese invention patent publication number: CN116439180A: A breeding system, fish collecting device and fish collecting method, which discloses that the height of the fish collecting frame in the seawater is adjusted by inflating and deflating the sinking and floating parts; the fish in the breeding cage enter the fish collecting cavity through the top opening, and the sinking and floating parts can be inflated to drive the fish collecting frame and the fish in the fish collecting cavity to float until the top of the fish collecting frame is at sea level; the problems therein are: 1. The fish collecting frame is a fixed structure, that is, The opening at the top of the fish collecting frame and the size of the fish collecting frame are unique. When the fish catching needs to be increased or decreased, the size of the fish collecting frame itself cannot be adjusted and cannot be adapted to different catching requirements; 2. The opening at the top of the fish collecting frame is not sealed. When the fish collecting frame is inflated by the sinking and floating parts and rises to the sea level, it takes a certain amount of time to rise, making it easy for farmed fish to escape from the opening, reducing the catching efficiency; 3. When the farmed fish are collected, there is no structure to gather the farmed fish, that is, the space inside the fish collecting frame is large, and the farmed fish cannot be gathered in a certain place for convenient unified collection. Summary of the Invention

[0005] The purpose of the present invention is to provide a cage fishing device with adjustable diameter, which not only realizes the adjustment of the fish inlet and fishing space to meet different fishing requirements, but also enables the fish inlet space to be quickly closed to prevent fish from escaping, thereby improving the fishing efficiency, and can gather fish from bottom to top, facilitating unified collection operations and reducing fish loss rates.

[0006] To achieve the above-mentioned purpose, the present invention provides a diameter-adjustable net cage catching device, comprising:

[0007] floating platforms;

[0008] The net is installed on a floating platform, with fish attractants on the inside and a bell-shaped structure that can expand outwards at the bottom.

[0009] An expansion member is mounted on the lower end of the net and comprises at least three groups of cylindrical members arranged at intervals in the circumferential direction, and corrugated tubes connected between the cylindrical members;

[0010] The cylindrical member comprises a first cylindrical body and a second cylindrical body. One end of the first cylindrical body and the second cylindrical body rotates relative to each other and the rotation axis is arranged vertically. A water injection pipe is connected to the pleated tube. When the water injection pipe injects water into or drains water from the pleated tube, the pleated tube can extend and contract accordingly.

[0011] a mesh skirt, the upper end of which is connected to the flared member;

[0012] The bottom net component is located below the net skirt and is driven to move up and down. The bottom net component is linked to the net skirt through the pulling component, so that the bottom net component and the lower end of the net skirt approach and move away from each other. After the bottom net component contacts the net skirt, it can move upward synchronously with the net skirt.

[0013] In some examples of the present invention, one end of the corrugated tube is folded and located in a first cylinder, the other end is folded and located in an adjacent second cylinder, and the middle portion is divided into two sections and respectively installed on the two ends of the tee pipe; the other end of the tee pipe is connected to the water injection pipe, and water injection components are provided at the two ends where the tee pipe is connected to the corrugated tube;

[0014] The water injection assembly comprises a support tube and a support block located in the support tube and elastically closing the support tube. When the water pressure in the tee pipe reaches a certain level, the support block opens the support tube and allows water to enter the fold of the pleated tube.

[0015] The support tube can be sleeved inside the first cylinder body and the second cylinder body, and when the water injection pressure reaches a certain value, the support tube is separated from the first cylinder body and the second cylinder body.

[0016] In some examples of the present invention, the interior of the support tube is a stepped hole structure, and a water-permeable plate is fixed to the end away from the tee pipe;

[0017] A second elastic member is provided between the permeable plate and the support block. The middle part of the support block is a shoulder structure. The shoulder is tapered at the end away from the tee pipe and closes the stepped hole of the support tube at the end close to the tee pipe.

[0018] The first cylinder and the second cylinder are provided with locking rods which are subject to radial movement and inward elastic force. The locking rods can pass through the supporting cylinder and contact the tapered shoulder of the support block.

[0019] In some examples of the present invention, on the same corrugated tube, the support block near the first cylinder first opens the corresponding support cylinder, and when the water injection pressure reaches a certain value after opening, the support block near the adjacent second cylinder then opens the corresponding support cylinder.

[0020] In some examples of the present invention, the pulling component has a plurality of circumferentially arranged pulling ropes, support wheels, and traction ropes;

[0021] The supporting wheel is installed on the cylinder, one end of the pulling rope is connected to the lower end of the net skirt, and the other end is wound around the outside of the supporting wheel and connected to the peripheral side of the bottom net component;

[0022] One end of the traction rope is connected to the peripheral side of the bottom net component and is in a tensioned state, and the other end is led out and connected to the driving component.

[0023] In some examples of the present invention, a plurality of counterweights are provided at the lower end of the net skirt, and the pulling rope is connected to some of the counterweights;

[0024] One end of the support rod away from the second support plate is provided with a first magnetic block capable of adsorbing the counterweight block, and the end is connected to the traction rope.

[0025] In some examples of the present invention, the bottom net component comprises a frame assembly and a bottom net laid on the frame assembly;

[0026] The frame assembly has a second support plate and a plurality of support rods uniformly arranged circumferentially;

[0027] The middle part of the support rod is rotatably mounted on the second support plate, one end close to the center of the second support plate is limited, and the end away from the center of the second support plate is connected to the traction rope;

[0028] When the middle portion of the second supporting plate is subjected to a greater load, one end of the supporting rod is released from the limit position and rotates around the middle portion thereof so that the lower end of the bottom net component becomes concave.

[0029] In some examples of the present invention, the bottom net component also has

[0030] The first support plate moves up and down relatively and is located above the second support plate;

[0031] a fourth elastic member, located between the first support plate and the second support plate, and applying an upward elastic force to the first support plate;

[0032] A plurality of limit blocks are radially movably connected to the second support plate and are connected to the first support plate via a first connecting rod;

[0033] Among them, one end of the support rod contacts the limit block downward to limit the position. When the first support plate moves downward, it will drive the limit block to move radially away from the support rod through the first connecting rod.

[0034] In some examples of the present invention, the driving component comprises a guide wheel set, a reel, and a driving member;

[0035] The traction rope is wound around the outside of the guide wheel group and connected to the reel. The driving member drives multiple reels to move synchronously to reel in and out the traction rope.

[0036] Each traction rope is provided with a rope limiting assembly, which comprises a support shaft, an electromagnetic coil, and a pair of clamping blocks located on both sides of the traction rope;

[0037] The support shaft is arranged to move, and one end is connected to a pair of clamping blocks through a second connecting rod, and the other end is sleeved with a fifth elastic member; when the support shaft moves, the second connecting rod causes the pair of clamping blocks to move closer to or farther from each other;

[0038] One end of the fifth elastic member is fixed, and the other end acts on the support shaft so that the support shaft is subjected to an elastic force; the electromagnetic coil matches the second magnetic block fixedly connected to the support shaft, so that when the electromagnetic coil is energized, the support shaft is subjected to a force opposite to the elastic force on the support shaft;

[0039] The electromagnetic coil and the driving member have the same power source, and when the electromagnetic coil loses power, the supporting shaft is subjected to elastic force, causing the pair of clamping blocks to approach each other.

[0040] The present invention also aims to provide a method for using an adjustable diameter net cage fishing device, in which the variable diameter adjustment of the net and the net skirt is driven by the expansion component, thereby realizing the adjustment of the fish inlet and the fishing space, which is suitable for different fishing requirements; the bottom net component and the net skirt are linked to move closer to and farther away from each other, thereby realizing a two-way sealing method so that the fish inlet space is quickly closed to prevent the fish from escaping; when fishing, the bottom net component moves to compress the net skirt and the net from bottom to top, and at the same time the expansion component shrinks, so that the fish are further gathered to the center, which is convenient for the unified discharge and collection of the fish.

[0041] A method for using a diameter-adjustable net cage catching device specifically comprises the following steps:

[0042] S1. Initially, the adjustable diameter net cage catching device is placed in the aquaculture space of the net cage, and the catching device and the net of the net cage are prevented from contacting each other. The net, net skirt, and bottom net are suspended in the water. According to the different activity areas of different types of farmed fish in the net cage, the traction rope drives the bottom net to be lowered, so that there is a certain distance between the bottom net and the lower end of the net skirt to form a space for fish to enter.

[0043] S2, the expansion member is suspended in the water. According to the fishing requirements, the size of the fish inlet and the fishing space is adjusted by expanding the expansion member: the water injection pipe injects water into the pleated tube, the pleated tube gradually expands and extends, and the first cylinder and the second cylinder rotate relative to each other for adjustment. The expansion member is in a variable diameter state. When the pleated tube is fully expanded and extended, the expansion member drives the net and the net skirt to a fully expanded state.

[0044] S3, the fish attracting parts in the net work, the fish enter the fish inlet from the fish inlet space and gradually settle in the net;

[0045] When fishing, the traction rope drives the bottom net component to rise. Under the action of the traction rope, the lower end of the net skirt moves downward and quickly approaches the bottom net component to contact each other, completing the sealing of the fish entry space; when the net skirt contacts the bottom net component, the net, the net skirt and the bottom net component form a closed fishing space, and the bottom net component continues to move upward, gradually compressing the fishing space from bottom to top, so that the fish in it gradually gather upward to the upper part of the net.

[0046] At the same time, the water injection pipe can be used for drainage, and multiple pleated tubes can be simultaneously contracted to a certain inner diameter to further gather fish;

[0047] S4, when the fish gather upwards to the upper part of the net, the fish driving part on one side of the net is activated, which can drive the fish to the output net pipe on the other side, so that the fish are discharged from the output net pipe for collection, completing one fishing action; when the fishing continues, the traction rope drives the bottom net component to continue to be lowered, and during the movement of the bottom net component, the net and the net skirt are gradually released from top to bottom, forming a fishing space and a fish entry space.

[0048] Compared with the prior art, the present invention has an adjustable diameter net cage catching device. Since an expansion component is provided between the net and the net skirt, when the water injection pipe injects water into the pleated tube, the pleated tube expands, stretches, contracts and folds accordingly, and the first cylinder and the second cylinder rotate adaptively with each other. Therefore, the expansion component drives the net and the net skirt to adjust the diameter, thereby completing the change of the fish inlet and the fishing space, which is suitable for different catching requirements. In addition, the support blocks are opened to the inside of the support tube and are separated from the corresponding cylinder by linkage, and the adjacent support blocks on the tee pipe can be opened in sequence according to the water pressure, thereby realizing the expansion of the expansion component in two stages, which is better suitable for different use environments.

[0049] Since the bottom net component is linked to the net skirt through the pulling component, the bottom net component and the lower end of the net skirt are moved closer to or away from each other. Therefore, when catching, the bottom net component moves upward and the lower end of the net skirt moves downward in a linked manner. The fish entry space is quickly closed by a two-way sealing method to prevent fish from escaping, thereby improving the catching effect. When the net skirt contacts the bottom net component, the bottom net component continues to move upward, gradually compressing the net skirt and the net from bottom to top, not only preventing some fish from excessive contact with the net skirt and the net and causing mutual damage, but also causing the fish in the net to gradually gather upward to the upper part of the net. At the same time, the expanding component shrinks, causing the fish to further gather towards the center, making it convenient for the fish to be discharged and collected uniformly.

[0050] Since the bottom net component has a frame assembly and a bottom net laid on the frame assembly, one end of the support rod in the frame assembly is limited and can rotate around its middle portion so that the lower end of the bottom net component becomes concave. When fish gather and gradually act on the second support plate during fishing, one end of the support rod can be freed from the limit and rotate around its middle portion to "catch" the lower end of the fishing device and prevent the fish from escaping. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is an overall schematic diagram of the present invention;

[0052] Figure 2 This is the overall front view of the present invention; (ignoring the specific form of the net clothes and net skirts)

[0053] Figure 3 It is a schematic diagram of the pulling component in the present invention;

[0054] Figure 4 is a schematic diagram of the connection between the mesh skirt and the flared component in the present invention;

[0055] Figure 5 This is a schematic diagram of the connection between the flaring component and the water injection pipe in the present invention;

[0056] Figure 6 This is a front view of the three-way pipe connected to the first cylinder and the second cylinder in the present invention;

[0057] Figure 7 This is a front view of the water injection assembly at the connection between the tee pipe and the corrugated pipe in the present invention;

[0058] Figure 8 is a schematic diagram of the frame assembly of the present invention;

[0059] Figure 9 is a front view of the frame assembly of the present invention;

[0060] Figure 10 This is a front view of the bottom net component of the present invention, wherein the support rod rotates to form a concave shape;

[0061] Figure 11 This is a flow chart of the present invention in which the bottom net component moves upward under the action of the traction rope to compress the net skirt and net clothing;

[0062] Figure 12 This is a front view of the rope limiting assembly of the present invention;

[0063] In the figure: 10, floating platform;

[0064] 20. Net, 21. Fish attractant, 22. Fish repellent, 23. Output net management;

[0065] 30. Net skirt, 31. Counterweight;

[0066] 40. Expanding member, 41. First cylinder, 42. Second cylinder, 43. Tee, 44. Water injection pipe, 451. Support cylinder, 452. Support block, 453. Second elastic member, 454. Water-permeable plate, 455. Third elastic member, 456. Locking rod, 46. Corrugated tube, 461. Hanging ring;

[0067] 50. Bottom net component, 51. Frame assembly, 511. First support plate, 512. Second support plate, 513. Support rod, 514. Limit block, 515. Fourth elastic member, 516. First connecting rod, 517. First magnetic block; 52. Bottom net;

[0068] 61. Pull rope, 62. Support wheel;

[0069] 70. Tow rope;

[0070] 81. Clamping block, 82. Second connecting rod, 83. Second magnetic block, 84. Electromagnetic coil, 85. Fifth elastic member, 86. Support shaft. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar terms used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "an" do not necessarily indicate a quantity limitation. Words such as "include" or "comprising" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0073] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 11 As shown, the present invention is a net cage catching device with adjustable diameter, comprising:

[0074] Floating platform 10;

[0075] The net 20 is mounted on the floating platform 10, has a fish attracting member 21 on the inside, and has a bell-shaped structure that can expand outward at the bottom.

[0076] a flared member 40 mounted at the lower end of the net 20 and having at least three sets of circumferentially spaced cylindrical members and corrugated tubes 46 connected between the cylindrical members;

[0077] The cylindrical member comprises a first cylindrical body 41 and a second cylindrical body 42. One end of the first cylindrical body 41 and the second cylindrical body 42 rotates relative to each other and the rotation axis is arranged vertically. A water injection pipe 44 is connected to the pleated tube 46. When the water injection pipe 44 injects water into or drains water from the pleated tube 46, the pleated tube 46 can extend and contract accordingly.

[0078] The mesh skirt 30 has its upper end connected to the flared member 40;

[0079] The bottom net component 50 is located below the net skirt 30 and is driven to move up and down. The bottom net component 50 is linked to the net skirt 30 through the pulling component, so that the bottom net component 50 and the lower end of the net skirt 30 move closer to and away from each other. After the bottom net component 50 contacts the net skirt 30, it can move upward synchronously with the net skirt 30.

[0080] Specifically, the floating platform 10 is a supporting object floating on the water, which may be a ring body of an inflatable structure or a platform with multiple floating ball structures;

[0081] The net 20 and the net skirt 30 are both circumferentially closed meshes, that is, the retractable structure can be contracted and expanded, wherein the upper part of the net 20 is used to gather fish, that is, it can be a cylindrical fish-gathering space when expanded, and a fish-attracting component 21 is provided inside, such as fish feed or a fish-attracting lamp. The fish-attracting lamp is a tool that attracts fish by generating light of a specific color (such as blue-green light) or a flashing pattern, or light of a specific wavelength. This is a prior art and will not be further elaborated. Furthermore, a fish-repelling component 22 is provided on one side of the upper part of the net 20, and an output net pipe 23 for discharging fish is provided on the other side. The fish-repelling component 22 can be an acoustic fish-repelling device that emits specific sound waves such as low-frequency sound waves and noise, or a structure that uses an inflatable structure or water flow disturbance to drive fish. Its purpose is that when fish are concentrated on the upper part of the net 20, the fish-repelling component 22 is activated to drive the fish to the output net pipe 23 on the other side, so that the fish are discharged and collected uniformly from the output net pipe 23.

[0082] The expansion component 40 is installed at the lower end of the bell mouth of the net 20, and can expand the diameter according to the fishing requirements to complete the adjustment of the size of the fish inlet and the fishing space; the pleated tube 46 is expanded and elongated and contracted and folded by the injection / drainage method, and the cylinder part is used for the skeleton support; when the number of cylinder parts is four, the four pleated tubes 46 are respectively located between adjacent cylinder parts, and the pleated tube 46 is expanded and elongated after being filled with water, and the first cylinder 41 and the second cylinder 42 rotate relative to each other for adaptive adjustment, so that the expansion component 40 presents a quasi-quadrilateral structure; when there are six cylindrical members, the flaring member 40 presents a quasi-hexagonal structure; the more cylindrical members there are, the more the flaring surface of the lower end of the net 20 approaches a circle and the larger the area is under the action of the flaring member 40; or the pleated tube 46 has an arc-shaped pleated structure, that is, when it is filled with water and expanded, the pleated tube 46 presents an arc shape, which can drive the first cylindrical body 41 and the second cylindrical body 42 to rotate relative to each other for adaptive adjustment, thereby making the flaring surface of the lower end of the net 20 approach a circle;

[0083] There can be multiple water injection pipes 44 corresponding to the corrugated pipes 46. When water injection or drainage is performed, the multiple corrugated pipes 46 can be extended and contracted synchronously to ensure that the flared member 40 is uniformly expanded or contracted. One end of the water injection pipe 44 can be led out to the outside to pass through the pump body for unified water injection or drainage.

[0084] The net skirt 30 and the bottom net component 50 are connected to each other. The upper end of the net skirt 30 is connected to the expansion component 40 and can shrink and expand accordingly. The lower end of the net skirt 30 is equivalent to the fish inlet, and a certain amount of fish inlet space is left between the bottom net component 50 and the net skirt 30. The fish inlet space can be adjusted. That is, the bottom net component 50 is linked to the net skirt 30 through the pulling component, so that the bottom net component 50 and the lower end of the net skirt 30 are moved closer to or farther away from each other.

[0085] A net cage catching device with adjustable diameter is placed in the breeding space of the net cage, such as Figure 11 As shown, in the initial state, according to the different activity areas (depths) of different types of cultured fish in the cage, the bottom net component 50, the net skirt 30, and the flared component 40 are lowered to an appropriate depth, in a suspended state, and the device is prevented from contacting the cage structure. The position of the bottom net component 50 is adjusted to have a certain distance from the net skirt 30. This distance allows fish to enter the net skirt 30 and the net cover 20, ensuring that there is space for fish to enter the depth area. The pleated tube 46 in the flared component 40 is in a contracted state, that is, the lower end of the net cover 20 is in a contracted state.

[0086] The expanding member 40 is suspended in the water and adjusts the size of the fish inlet and the fishing space according to the fishing requirements: the water injection pipe 44 injects water into the pleated tube 46, which gradually expands and extends, causing the first cylinder 41 and the second cylinder 42 to rotate relative to each other for adjustment. The expanding member 40 is in a variable diameter state. When the pleated tube 46 is fully expanded and extended, the expanding member 40 drives the net 20 and the net skirt 30 to a fully expanded state. At this time, the fish inlet size is maximized, and the fishing space formed by the net skirt 30 and the net 20 is also maximized, thereby luring the maximum number of fish.

[0087] The fish attracting member 21 in the net 20 is in operation. Fish enter between the net skirt 30 and the bottom net member 50 and gradually become located in the net 20. When catching, the bottom net member 50 is linked to the net skirt 30 via the pulling member, so that the bottom net member 50 and the net skirt 30 can quickly move closer to each other. This closeness can quickly close the fish entry space and prevent the fish from escaping.

[0088] When the net skirt 30 contacts the bottom net component 50, the net 20, the net skirt 30 and the bottom net component 50 form a closed fishing space, and the bottom net component 50 continues to move upward, gradually compressing the net skirt 30 and the net 20 from bottom to top, so that the fish inside are gradually gathered upward to the upper part of the net 20; during the process of the bottom net component 50 continuing to move upward, its speed is relatively slow, on the one hand, to avoid excessive contact between the fish and the net skirt 30 and the net 20, causing mutual damage, and on the other hand, slowly compressing the space can avoid "overreaction" of some fish; while the net skirt 30 is being compressed, the water injection pipe 44 can be used for drainage, and the multiple pleated tubes 46 are synchronously contracted to a certain inner diameter, which can further gather the fish;

[0089] When the fish gather upward to the upper part of the net 20, the fish driving member 22 on one side of the net 20 is activated, which can drive the fish to the output net pipe 23 on the other side, so that the fish are discharged and collected from the output net pipe 23 in a unified manner, completing a fishing action; when the fishing continues, the bottom net component 50 is driven to move downward, and during the movement, the net 20 and the net skirt 30 are gradually released from top to bottom to form a fishing space; when the net skirt 30 moves downward to a certain position with the bottom net component 50 and the bottom net component 50 is separated from the net skirt 30, under the pulling component, the bottom net component 50 and the net skirt 30 quickly move away from each other to form a fish entry space.

[0090] In some examples of the present invention, Figures 4 to 7 As shown, one end of the pleated tube 46 is folded and located in the first cylinder 41, the other end is folded and located in the adjacent second cylinder 42, and the middle part is divided into two parts and respectively installed on the two ends of the tee pipe 43;

[0091] The other end of the tee pipe 43 is connected to the water injection pipe 44, and the two ports where the tee pipe 43 is connected to the pleated pipe 46 are both provided with water injection components;

[0092] The water injection assembly comprises a support tube 451 and a support block 452 located inside the support tube 451 and elastically closing the support tube 451. When the water pressure in the tee pipe 43 reaches a certain level, the support block 452 opens the support tube 451 and allows water to enter the fold of the pleated tube 46.

[0093] The support tube 451 can be mounted inside the first cylinder 41 and the second cylinder 42 , and when the water injection pressure reaches a certain value, the support tube 451 is separated from the first cylinder 41 and the second cylinder 42 ;

[0094] Specifically, the corrugated tube 46 between adjacent cylindrical members is divided into two sections and connected by a tee 43; that is, the two coaxial ends of the T-shaped tee 43 are connected to the corrugated tube 46, and the other end is connected to the water injection pipe 44;

[0095] The water injection assembly is used to fix the tee 43 between adjacent cylinder members. When a certain water injection pressure is reached, the tee 43 is separated from the first cylinder 41 or the second cylinder 42, and is used to pass water into the pleated tube 46. Among them, one end of the support tube 451 can be threadedly connected to the tee 43 and the other end is connected to the pleated tube 46. The support block 452 inside the support tube is movably arranged to open and close the support tube 451 and to cause the tee 43 to separate from the corresponding cylinder.

[0096] Initially, the pleated tube 46 is contracted and located in the corresponding cylinder, and the tee 43 is connected between the adjacent cylinder parts, which not only reduces the overall size of the flared component 40, but also provides a certain protection for the pleated tube 46; the support block 452 is located in the support tube 451 and elastically closes the support tube 451. When the water injection pressure reaches a certain value, the support block 452 moves to open the support tube 451, allowing water to enter the pleated tube 46 to expand and elongate. Under the internal pressure of the pleated tube 46, that is, when the water injection pressure reaches a certain value, the support tube 451 is separated from the corresponding first cylinder 41 and second cylinder 42. It is explained that the support tube 451 can be installed inside the first cylinder 41 and the second cylinder 42 by means of transition or interference fit;

[0097] In addition, if Figure 5 、 Figure 6 As shown, when the pleated tube 46 is contracted and located in the corresponding cylinder, in order to ensure the close proximity between the lower end of the net 20 and the flaring part 40, the upper end of the net skirt 30 and the flaring part 40, and the net 20 and the net skirt 30 are expanded as the flaring part 40 expands outward, taking the first cylinder 41 as an example, a strip groove can be opened on the first cylinder 41, which runs through the first cylinder 41 from top to bottom, is arranged along the axis and is open at one end. The lower end of the net 20 and the upper end of the net skirt 30 can be installed on the outside of the pleated tube 46 through a plurality of hanging rings 461, and the middle part of the hanging ring 461 slides in the strip groove. When the pleated tube 46 is extended, the net 20 and the net skirt 30 can expand outward accordingly; further, the opening of the strip groove can be set as an angle, so that when the pleated tube 46 is contracted, the hanging rings 461 on the net 20 and the net skirt 30 can smoothly enter the strip groove.

[0098] In some examples of the present invention, Figure 6 、 Figure 7 As shown, the interior of the support tube 451 is a stepped hole structure, and a water-permeable plate 454 is fixed to the end away from the tee pipe 43;

[0099] A second elastic member 453 is provided between the permeable plate 454 and the support block 452. The middle portion of the support block 452 is a shoulder structure. The shoulder is tapered at the end away from the tee pipe 43 and closes the stepped hole of the support tube 451 at the end close to the tee pipe 43.

[0100] The first cylinder 41 and the second cylinder 42 are provided with a locking rod 456 which is subjected to radial movement and inward elastic force. The locking rod 456 can pass through the support cylinder 451 and contact the tapered shoulder of the support block 452.

[0101] Specifically, the first cylinder 41 and the second cylinder 42 are provided with an inner cavity at one end close to the tee pipe 43, and a third elastic member 455 and a radially movable locking rod 456 are provided in the inner cavity. The second elastic member 453 and the third elastic member 455 can both be anti-corrosion cylindrical springs.

[0102] Initially, under the action of the second elastic member 453, the support block 452 approaches the tee pipe 43, and the central shoulder of the support block 452 contacts the stepped hole of the support tube 451, so that the support tube 451 is in a closed state. Under the action of the third elastic member 455, one end of the locking rod 456 extends and contacts the tapered shoulder of the support block 452. At this time, the support tube 451 is fixedly mounted on the first and second tube bodies 41, 42 due to the action of the locking rod 456.

[0103] When the water injection pressure reaches a certain value, under the action of water pressure, the support block 452 will move away from the tee pipe 43 and compress the second elastic member 453. On the one hand, water enters the pleated tube 46 to stretch it. On the other hand, in the process of the support block 452 moving away from the tee pipe 43, the tapered shoulder in the middle of the support block 452 will squeeze the locking rod 456 and move it radially outward, so that the support tube 451 can be easily released from the limit on the corresponding cylinder body, and under the action of the internal pressure of the pleated tube 46, the support tube 451 can be completely separated from the corresponding cylinder body; in this example, the support block 452 can be moved under water pressure to realize the linkage between the opening of the interior of the support tube 451 and the separation of the support tube 451 from the corresponding cylinder body. The structure is simple and compact, which avoids the problem that the support tube 451 is too tightly connected to the corresponding cylinder body and cannot be separated, or the connection is too loose, causing the pleated tube 46 to be unable to fold in the cylinder body.

[0104] In some examples of the present invention, on the same pleated tube 46, the support block 452 near the first cylinder 41 first opens the corresponding support cylinder 451, and when the water injection pressure reaches a certain value after opening, the support block 452 near the adjacent second cylinder 42 then opens the corresponding support cylinder 451;

[0105] Specifically, during the water injection process of the water injection pipe 44, the flared member 40 is in a variable diameter state. In this state, the net 20 and the net skirt 30 are not fully expanded, that is, part of the pleated tubes 46 are extended. Although the net 20 and the net skirt 30 can be expanded to a certain size for fishing operations, the overall structure is unstable in this state because part of the pleated tubes 46 is still contracted. When the pleated tubes 46 are fully expanded and extended, the flared member 40 drives the net 20 and the net skirt 30 to a fully expanded state. This state is more stable, but the overall size in this stable state is the largest and singlest, which cannot be applied to fishing environments of different sizes. This example is used to solve the above problem.

[0106] To ensure that the support block 452 at the first cylinder 41 opens the support cylinder 451 before the support block 452 at the second cylinder 42, the elastic modulus of the second elastic member 453 located in the support cylinder 451 at the first cylinder 41 is smaller than the elastic modulus of the second elastic member 453 located in the support cylinder 451 at the second cylinder 42 when the size and structure are the same;

[0107] For ease of explanation, it is assumed that the middle portion of the pleated tube 46 between adjacent cylindrical members is divided into tube A and tube B. Tube A is connected to the first cylindrical member 41, and the support block 452 near the first cylindrical member 41 is defined as support block A. Tube B is connected to the second cylindrical member 42 in the other cylindrical member, and the support block 452 near the second cylindrical member 42 is defined as support block B.

[0108] The tee pipe 43 is connected between the first cylinder 41 and the second cylinder 42. When the water injection pressure in the water injection pipe 44 reaches the value C1, the support block A moves first to open the corresponding support cylinder 451. At this time, the tube A in the contracted state in the first cylinder 41 gradually extends until it is fully extended. The tube A of the other pleated tubes 46 also extends synchronously until it is fully extended. This is the first stage of the expansion of the flaring component 40. In this stage, the tube B is still in the contracted state, and the tee pipe 43 can still be fixed on the second cylinder 42. The net clothes 20 and the net clothes The skirt 30 can fish at a certain stable size. When further expansion is required, water is continuously injected into the water injection pipe 44 until the internal water injection pressure reaches the value C2. The support block B moves to open the corresponding support tube 451. At this time, the tube B in the second cylinder 42, which is in a contracted state, gradually extends until it is fully extended. The tubes B of the other pleated tubes 46 also extend synchronously until they are fully extended. This is the second stage of the expansion of the flaring component 40. At this time, the tubes A and B are fully extended, and the net 20 and the net skirt 30 can fish at their maximum size.

[0109] In this example, under different water injection pressures, the support cylinders 451 at different positions are opened in sequence by moving the support block 452, so that the expansion component 40 can expand outward in two stages, and this expansion can better maintain the size of the net 20 and the net skirt 30, and is suitable for different usage environments.

[0110] In some examples of the present invention, Figure 1 、 Figure 3 、 Figure 4 As shown, the pulling component has a plurality of circumferentially arranged pulling ropes 61, a support wheel 62, and a pulling rope 70;

[0111] The support wheel 62 is mounted on the cylindrical member, one end of the pulling rope 61 is connected to the lower end of the net skirt 30, and the other end is wound around the outside of the support wheel 62 and connected to the peripheral side of the bottom net member 50;

[0112] One end of the traction rope 70 is connected to the side of the bottom net component 50 and is in a tensioned state, and the other end is led out and connected to the driving component;

[0113] Specifically, the traction rope 70 is used to drive the bottom net component 50 to move up and down. Initially, the bottom net component 50 can be lowered to a suitable position by the traction rope 70 to form a fish entry space with the net skirt 30 to match fish at different depths. The traction ropes 70 are evenly connected around the bottom net component 50, and the upper ends extend out to connect with the driving component for traction. The driving component can not only control the synchronous movement of multiple traction ropes 70 to make the bottom net component 50 rise and fall horizontally and stably, but also adjust the traction speed so that the bottom net component 50 quickly contacts the net skirt 30 and then slowly moves upward after contact.

[0114] The pulling rope 61 is used to link the bottom net component 50 with the net skirt 30;

[0115] The support wheel 62 is used to support the pulling rope 61 to facilitate the movement of the pulling rope 61 during linkage. In order to prevent the pulling rope 61 from detaching from the support wheel 62, the support wheel 62 has a wheel frame and a wheel body. The wheel frame is fixedly mounted on the cylindrical member, and the wheel body is rotatably mounted on the wheel frame. An annular groove for embedding the pulling rope 61 is provided on the circumference. A limiting plate is provided on the upper end of the wheel frame to wrap around the outside of the pulling rope 61. Figure 6 As shown, the limiting plate limits the pulling rope 61 to prevent the pulling rope 61 from being separated from the supporting wheel 62 due to the influence of the underwater environment such as water flow or the movement of the pulling rope 61;

[0116] In this example, the bottom net component 50 and the lower end of the net skirt 30 both have a certain weight, and the weight of the bottom net component 50 is greater than the weight of the lower end of the net skirt 30. The bottom net component 50 is gradually lowered to a certain depth in the water by the traction rope 70. The traction rope 61 is pulled and under its action, the distance between the net skirt 30 and the bottom net component 50 is maximized, forming the largest space for fish to enter.

[0117] When fishing, the traction rope 70 drives the bottom net component 50 to move upward. At the same time as the bottom net component 50 moves, under the action of the traction rope 61 and the net skirt 30's own weight, the net skirt 30 moves downward and gradually contacts the bottom net component 50, thereby quickly closing the fish entry space to prevent the fish from escaping. After contact, the traction rope 61 is no longer under tension, and the traction rope 70 continues to move upward, gradually supporting the net skirt 30 and the net cover 20 from bottom to top, so that the fish in the net skirt 30 and the net cover 20 gradually gather upward.

[0118] As explained, the support wheel 62 is installed on the cylindrical part, and the force applied to the support wheel 62 and the pulling rope 61 can be ensured through the cylindrical part; when the flaring part 40 contracts inward, the support wheel 62 on the cylindrical part will drive the pulling rope 61 to move inward. Therefore, the pulling rope 61 is required to have a length that can ensure the inward movement of the support wheel 62 on the cylindrical part, so as to avoid the problem that the pulling rope 61 is under tension and cannot be adjusted when the flaring part 40 is not contracted to a smaller size.

[0119] In some examples of the present invention, Figure 3 、 Figure 4 、 Figure 8 As shown, a plurality of counterweight blocks 31 are provided at the lower end of the net skirt 30, and the pulling rope 61 is connected to some of the counterweight blocks 31;

[0120] The end of the support rod 513 away from the second support plate 512 is provided with a first magnetic block 517 capable of attracting the counterweight 31, and the end is connected to the traction rope 70;

[0121] Specifically, a counterweight 31 is provided at the lower end of the net skirt 30, and a pull rope 61 is connected to some of the counterweights 31. This allows for a quick response when the bottom net component 50 and the net skirt 30 move closer to or farther from each other, and prevents fish from escaping from the net skirt 30. Furthermore, adjacent counterweights 31 can be connected by a soft rope to ensure that when one counterweight 31 is pulled by the pull rope 61, the other counterweights 31 can be linked to each other.

[0122] A first magnetic block 517 is provided on the support rod 513. When the bottom net member 50 moves upward via the traction rope 70 and contacts the net skirt 30, the first magnetic block 517 on the bottom net member 50 can attract the nearest counterweight block 31, thereby ensuring the connection between the bottom net member 50 and the net skirt 30 and preventing fish from escaping.

[0123] As explained, the pulling force on the pulling rope 61 by the bottom net component 50 is greater than the sum of the gravity of the counterweight block 31 at the lower end of the net skirt 30 and the adsorption force between the counterweight block 31 and the first magnetic block 517. Therefore, when the traction rope 70 drives the bottom net component 50 to be lowered, the front Dongsheng 61 is gradually subjected to force, and the counterweight block 31 can automatically separate from the bottom net component 50.

[0124] In some examples of the present invention, Figure 1 、 Figures 8 to 10 As shown, the bottom net component 50 comprises a frame assembly 51 and a bottom net 52 laid on the frame assembly 51;

[0125] The frame assembly 51 has a second support plate 512 and a plurality of support rods 513 evenly arranged circumferentially;

[0126] The middle portion of the support rod 513 is rotatably mounted on the second support plate 512, one end close to the center of the second support plate 512 is limited, and the end away from the center of the second support plate 512 is connected to the traction rope 70;

[0127] When the middle portion of the second support plate 512 bears a large load, one end of the support rod 513 is released from the limit and rotates around the middle portion thereof, causing the lower end of the bottom net member 50 to become concave.

[0128] Specifically, the frame assembly 51 can make the bottom net component 50 have a certain weight and sink quickly. The support rod 513 in the frame assembly 51 is connected to the traction rope 70, thereby ensuring the traction and lifting effect;

[0129] The second support plate 512 can rotate around its center, and the rotation angle needs to be limited. For example, a positioning block is set on the support rod 513, so that the end of the second support plate 512 close to the limit block 514 can rotate downward by no more than 60 degrees; driven by the traction rope 70, the bottom net component 50 drives the net skirt 30 and the net cover 20 to be compressed from bottom to top. At this time, the fishing space is compressed, and the caught fish will be gathered. The flat structure of the bottom net component 50 cannot be suitable for catching too many fish. There is a problem that fish escape from between the net skirt 30 and the bottom net component 50. Therefore, as the fish acts on the second support plate 512 and the second support plate 512 is subjected to a large load, one end of the support rod 513 can be freed from the limit and rotate around the middle to make the lower end of the bottom net component 50 concave, which can "hold" the lower end of the catching device and prevent the fish from escaping.

[0130] In some examples of the present invention, Figures 8 to 10 As shown, the bottom net component 50 also has

[0131] The first support plate 511 moves up and down relatively and is located above the second support plate 512;

[0132] The fourth elastic member 515 is located between the first support plate 511 and the second support plate 512 and applies an upward elastic force to the first support plate 511;

[0133] A plurality of limit blocks 514 are connected to the second support plate 512 for radial movement and are connected to the first support plate 511 via a first connecting rod 516;

[0134] One end of the support rod 513 contacts the limit block 514 downward to limit the position. When the first support plate 511 moves downward, it drives the limit block 514 to move radially away from the support rod 513 through the first connecting rod 516.

[0135] Specifically, the first support plate 511 and the second support plate 512 are concentric and are used to bear the load. The lower end of the first support plate 511 extends below the second support plate 512 and is movably connected to the limit block 514 through the first connecting rod 516.

[0136] Initially, under the action of the fourth elastic member 515, the first support plate 511 is subjected to an upward elastic force. Under the action of the first connecting rod 516, the limit block 514 is in a radially outward position and can receive one end of the support rod 513. When the bottom net component 50 gradually moves upward and receives more fish, the first support plate 511 moves downward to compress the fourth elastic member 515. At the same time, the limit block 514 is driven to move radially inward through the first connecting rod 516, thereby breaking away from the limit on the support rod 513. The support rod 513 will rotate around its middle part so that the lower end of the bottom net component 50 becomes concave, completing the wrapping of the fish. As explained, when a small number of fish are caught, the bottom net component 50 does not deform, but when a large number of fish are caught, the bottom net component 50 deforms.

[0137] Furthermore, an adjusting disk that moves up and down is threadedly mounted on the second support plate 512. One end of the fourth elastic member 515 contacts the adjusting disk and the other end is connected to the first support plate 511. The lower part of the first support plate 511 passes through the second support plate 512 to limit the position. Therefore, by rotating the adjusting disk, the fourth elastic member 515 is compressed, thereby changing the upward elastic force borne by the first support plate 511, so that the first support plate 511 is deformed when it carries a fish of appropriate weight.

[0138] In some examples of the present invention, Figure 11 、 Figure 12 As shown, the driving component comprises a guide wheel set, a reel, and a driving member;

[0139] The traction rope 70 is wound around the outside of the guide wheel assembly and connected to the reel. The driving member drives the reel to reel in and unreel the traction rope 70.

[0140] Multiple reels move synchronously;

[0141] Each traction rope 70 is provided with a rope limiting assembly, which comprises a support shaft 86, an electromagnetic coil 84, and a pair of clamping blocks 81 located on both sides of the traction rope 70;

[0142] The support shaft 86 is arranged to move, and one end is connected to the pair of clamping blocks 81 through the second connecting rod 82, and the other end is covered with a fifth elastic member 85. When the support shaft 86 moves, the second connecting rod 82 causes the pair of clamping blocks 81 to move closer to or farther from each other.

[0143] One end of the fifth elastic member 85 is fixed, and the other end acts on the support shaft 86, so that the support shaft 86 is subjected to an elastic force; the electromagnetic coil 84 matches the second magnetic block 83 fixedly connected to the support shaft 86, so that when the electromagnetic coil 84 is energized, the support shaft 86 is subjected to a force opposite to the elastic force on the support shaft 86;

[0144] The electromagnetic coil 84 and the driving member have the same power source, and when the electromagnetic coil 84 loses power, the support shaft 86 is subjected to elastic force, causing the pair of clamping blocks 81 to move closer to each other;

[0145] Specifically, the guide wheel assembly includes a plurality of guide wheels arranged at different positions and angles, and is used for guiding, reversing, and traction stability of the traction rope 70, so that the vertically drawn traction rope 70 can be reduced in diameter and moved closer to the middle of the floating platform 10, thereby facilitating the synchronous traction of the plurality of traction ropes 70 by the driving member;

[0146] As an example of a driving member synchronously pulling the traction rope 70, the driving member has a disc tooth that is driven to rotate, that is, the output end of the power source is meshed with the disc tooth through a reducer, and the axis of each reel is radially arranged and connected to a driving wheel at one end. The driving wheel is meshed with the disc tooth, and the driven rotation of the disc tooth will synchronously drive the driving wheel to rotate, thereby realizing the synchronous winding and unwinding of the traction rope 70 by multiple reels;

[0147] The rope limiting assembly is used to limit the position of the traction rope 70 to prevent the reel, drive member, etc. from being subjected to large forces during the pulling process of the traction rope 70. Taking the rope limiting assembly set on the vertical traction rope 70 as an example, the position close to the traction rope 70 is defined as the inner side, and the position away from the traction rope 70 is defined as the outer side;

[0148] The outer end of the clamping block 81 is rotatably connected to the floating platform 10 or other supporting object, and the inner end is close to the traction rope 70. Preferably, the clamping block 81 is a weighted structure with the center of gravity close to the traction rope 70, and the inner end of the clamping block 81 is an arc surface that gradually approaches the traction rope 70 from bottom to top;

[0149] The support shaft 86 is arranged to move up and down, and a pair of second connecting rods 82 are rotatably installed on the upper end, and the other end of the second connecting rod 82 is connected to the inner end of the clamping block 81. At this time, the pair of second connecting rods 82 form an "eight" shape. When the support shaft 86 moves downward, the pair of second connecting rods 82 can drive the pair of clamping blocks 81 to rotate closer to each other, thereby clamping and limiting the traction rope 70. When the support shaft 86 moves upward, the pair of second connecting rods 82 can drive the pair of clamping blocks 81 to rotate away from each other, thereby releasing the clamping of the traction rope 70.

[0150] When the electromagnetic coil 84 is energized, the force exerted on the support shaft 86 is opposite to the elastic force exerted on the support shaft 86. Under the action of the fifth elastic member 85, the support shaft 86 is subjected to a downward elastic force. Under the action of the electromagnetic coil 84, the electromagnetic coil 84 repels the second magnetic block 83, causing the support shaft 86 to be forced upward and compressing the fifth elastic member 85. When the driving member is started to pull the traction rope 70, current is passed through the electromagnetic coil 84, and the upward force exerted on the support shaft 86 is greater than the elastic force exerted on the support shaft 86. Then, the support shaft 86 moves upward, driving the pair of clamping blocks 81 away from each other through the second connecting rod 82, and the traction rope 70 can be pulled normally.

[0151] When the driving part is closed and no longer pulls the traction rope 70, the electromagnetic coil 84 loses power, and the support shaft 86 moves downward under the downward elastic force, driving a pair of clamping blocks 81 to approach each other through the second connecting rod 82, completing the clamping limit of the traction rope 70. At this time, the traction rope 70 is clamped and cannot be pulled. In addition, when the clamping block 81 is a biased weight structure and the inner end is an arc-shaped surface that gradually approaches the traction rope 70 from bottom to top, under the action of the elastic force of the support shaft 86 and the gravity of the clamping block 81, the inner end of the clamping block 81 can respond quickly to the traction rope 70, and the greater the tension on the traction rope 70, the greater the clamping force of the inner arc surface of the clamping block 81 on the traction rope 70.

[0152] The present invention relates to a net cage catching device with adjustable diameter, which specifically comprises the following steps when in use:

[0153] S1. Initially, a net cage catching device with an adjustable diameter is placed in the aquaculture space of the net cage, avoiding contact between the catching device and the net, particularly the net of the net cage. The net 20, net skirt 30, and bottom net 50 are suspended in the water. Based on the different activity areas of different types of aquaculture fish in the net cage, a traction rope 70 lowers the bottom net 50, ensuring a certain distance between the bottom net 50 and the lower end of the net skirt 30 to create space for fish entry.

[0154] S2, the flared member 40 is suspended in the water. According to the fishing requirements, the size of the fish inlet and the fishing space is adjusted by expanding the flared member 40: the water injection pipe 44 injects water into the pleated tube 46, the pleated tube 46 gradually expands and extends, and the first cylinder 41 and the second cylinder 42 rotate relative to each other for adjustment. The flared member 40 is in a variable diameter state. When the pleated tube 46 is fully expanded and extended, the flared member 40 drives the net 20 and the net skirt 30 to a fully expanded state.

[0155] S3, the fish attracting member 21 in the net 20 works, the fish enters the fish inlet from the fish inlet space and gradually settles in the net 20;

[0156] When fishing, the traction rope 70 drives the bottom net component 50 to rise. Under the action of the traction rope 61, the lower end of the net skirt 30 moves downward and quickly approaches the bottom net component 50 to complete the sealing of the fish entry space. When the net skirt 30 contacts the bottom net component 50, the net 20, the net skirt 30 and the bottom net component 50 form a closed fishing space. The bottom net component 50 continues to move upward, gradually compressing the fishing space from bottom to top, so that the fish in it gradually gather upward to the upper part of the net 20.

[0157] At the same time, the water injection pipe 44 can be used for drainage, and the multiple pleated tubes 46 can be simultaneously contracted to a certain inner diameter to further gather the fish;

[0158] S4, when the fish gather upward to the upper part of the net 20, the fish driving member 22 on one side of the net 20 is activated, which can drive the fish to the output net pipe 23 on the other side, so that the fish are discharged and collected from the output net pipe 23, completing one fishing action; when the fishing continues, the traction rope 70 drives the bottom net component 50 to continue to be lowered, and during the movement of the bottom net component 50, the net 20 and the net skirt 30 are gradually released from top to bottom, forming a fishing space and a fish entry space.

[0159] The above describes in detail an exemplary implementation of an adjustable diameter cage capture device proposed by the present invention with reference to a preferred embodiment. However, those skilled in the art will understand that, without departing from the concept of the present invention, various modifications and variations can be made to the above specific embodiments, and various technical features and structures proposed by the present invention can be combined in various ways without exceeding the scope of protection of the present invention, which is determined by the appended claims.

Claims

1. A net cage catching device with adjustable diameter, characterized in that: include: Floating platform (10); The net (20) has an upper portion mounted on the floating platform (10), a fish attracting member (21) provided on the inner side, and a bell-mouth structure capable of expanding outwards at the lower portion; A flared member (40) mounted on the lower end of the net (20) and having at least three groups of cylindrical members arranged at intervals in the circumferential direction and a pleated tube (46) connected between the cylindrical members; The cylindrical member comprises a first cylindrical body (41) and a second cylindrical body (42). One end of the first cylindrical body (41) and the second cylindrical body (42) rotates relative to each other and the rotation axis is arranged vertically. A water injection pipe (44) is connected to the pleated tube (46). When the water injection pipe (44) injects water or drains water into the pleated tube (46), the pleated tube (46) can extend and contract accordingly. A mesh skirt (30), the upper end of which is connected to the flaring member (40); The bottom net component (50) is located below the net skirt (30) and is driven to move up and down. The bottom net component (50) is linked with the net skirt (30) through the pulling component, so that the bottom net component (50) and the lower end of the net skirt (30) are moved closer to and away from each other. After the bottom net component (50) contacts the net skirt (30), it can move upward synchronously with the net skirt (30).

2. The adjustable diameter net cage catching device according to claim 1, characterized in that: One end of the corrugated tube (46) is folded and located in the first cylinder (41), the other end is folded and located in the adjacent second cylinder (42), and the middle part is divided into two parts and respectively installed on the two ends of the three-way pipe (43); the other end of the three-way pipe (43) is connected to the water injection pipe (44), and the two ends where the three-way pipe (43) and the corrugated tube (46) are connected are provided with water injection components; The water injection assembly comprises a support tube (451), a support block (452) located in the support tube (451) and elastically sealing the support tube (451); when the water pressure in the tee pipe (43) reaches a certain level, the support block (452) opens the support tube (451) and allows water to enter the fold of the pleated tube (46); The support tube (451) can be sleeved inside the first cylinder (41) and the second cylinder (42), and when the water injection pressure reaches a certain value, the support tube (451) is separated from the first cylinder (41) and the second cylinder (42).

3. The adjustable diameter net cage catching device according to claim 2, characterized in that: The interior of the support cylinder (451) is a stepped hole structure, and a water-permeable plate (454) is fixed on one end away from the tee pipe (43); A second elastic member (453) is provided between the water-permeable plate (454) and the support block (452). The middle portion of the support block (452) is a shaft shoulder structure. The shaft shoulder is tapered at one end away from the tee pipe (43) and is contact-closed at one end close to the tee pipe (43) with the stepped hole of the support cylinder (451). The first cylinder (41) and the second cylinder (42) are provided with a locking rod (456) that is subjected to radial movement and inward elastic force. The locking rod (456) can pass through the support cylinder (451) and contact the tapered shoulder of the support block (452).

4. The adjustable diameter net cage catching device according to claim 3, characterized in that: On the same pleated tube (46), the support block (452) near the first cylinder (41) first opens the corresponding support cylinder (451), and when the water injection pressure reaches a certain value after opening, the support block (452) near the adjacent second cylinder (42) then opens the corresponding support cylinder (451).

5. The adjustable diameter net cage catching device according to any one of claims 1 to 4, characterized in that: The pulling component comprises a plurality of circumferentially arranged pulling ropes (61), a support wheel (62), and a pulling rope (70); The supporting wheel (62) is mounted on the cylindrical member, one end of the pulling rope (61) is connected to the lower end of the net skirt (30), and the other end is wound around the outside of the supporting wheel (62) and then connected to the peripheral side of the bottom net member (50); One end of the traction rope (70) is connected to the peripheral side of the bottom net component (50) and is in a tensioned state, and the other end is led out and connected to the driving component.

6. The adjustable diameter net cage catching device according to claim 5, characterized in that: A plurality of counterweights (31) are provided at the lower end of the net skirt (30), and a pulling rope (61) is connected to some of the counterweights (31); One end of the support rod (513) away from the second support plate (512) is provided with a first magnetic block (517) capable of adsorbing the counterweight (31), and the end is connected to the traction rope (70).

7. The adjustable diameter net cage catching device according to claim 5, characterized in that: The bottom net component (50) comprises a frame assembly (51) and a bottom net (52) laid on the frame assembly (51); The frame assembly (51) has a second support plate (512) and a plurality of support rods (513) uniformly arranged in the circumferential direction; The middle portion of the support rod (513) is rotatably mounted on the second support plate (512), one end close to the center of the second support plate (512) is limited, and the end away from the center of the second support plate (512) is connected to the traction rope (70); When the middle portion of the second support plate (512) bears a large load, one end of the support rod (513) is released from the limit position and rotates around the middle portion thereof, so that the lower end of the bottom net component (50) becomes concave.

8. The adjustable diameter net cage catching device according to claim 7, characterized in that: The bottom net component (50) also has The first support plate (511) moves up and down relatively and is located above the second support plate (512); A fourth elastic member (515) is located between the first support plate (511) and the second support plate (512), and applies an upward elastic force to the first support plate (511); A plurality of limit blocks (514) are radially movably connected to the second support plate (512) and are interconnected with the first support plate (511) via a first connecting rod (516); One end of the support rod (513) contacts the limit block (514) downward to limit the position. When the first support plate (511) moves downward, it drives the limit block (514) to move radially away from the support rod (513) through the first connecting rod (516).

9. The adjustable diameter net cage catching device according to claim 5, characterized in that: The driving component comprises a guide wheel set, a reel, and a driving member; The traction rope (70) is wound around the outside of the guide wheel group and then connected to the reel, and the driving member drives the multiple reels to synchronously move to reel in and unreel the traction rope (70); Each traction rope (70) is provided with a rope limiting assembly, wherein the rope limiting assembly comprises a support shaft (86), an electromagnetic coil (84), and a pair of clamping blocks (81) located on both sides of the traction rope (70); The support shaft (86) is arranged to move, and one end is connected to a pair of clamping blocks (81) through a second connecting rod (82), and the other end is sleeved with a fifth elastic member (85); when the support shaft (86) moves, the second connecting rod (82) causes the pair of clamping blocks (81) to move closer to or farther from each other; One end of the fifth elastic member (85) is fixed, and the other end acts on the support shaft (86), so that the support shaft (86) is subjected to elastic force; the electromagnetic coil (84) matches the second magnetic block (83) fixedly connected to the support shaft (86), so that when the electromagnetic coil (84) is energized, the support shaft (86) is subjected to a force opposite to the elastic force on the support shaft (86); The electromagnetic coil (84) and the driving member have the same power source, and when the electromagnetic coil (84) loses power, the support shaft (86) is subjected to elastic force, causing the pair of clamping blocks (81) to approach each other.

10. A method for using the diameter-adjustable net cage catching device according to claim 5, characterized in that: The specific steps include: S1, initially, the adjustable diameter net cage catching device is placed in the aquaculture space of the net cage, and the catching device and the net of the net cage are prevented from contacting each other. The net (20), the net skirt (30) and the bottom net component (50) are suspended in the water. According to the different activity areas of different types of cultured fish in the net cage, the traction rope (70) drives the bottom net component (50) to be lowered, so that there is a certain distance between the bottom net component (50) and the lower end of the net skirt (30), forming a space for fish to enter; S2, the expanding member (40) is suspended in the water. According to the fishing requirements, the size of the fish inlet and the fishing space is adjusted by expanding the expanding member (40): the water injection pipe (44) injects water into the pleated tube (46), the pleated tube (46) gradually expands and stretches, and the first cylinder (41) and the second cylinder (42) rotate relative to each other for adjustment. The expanding member (40) is in a variable diameter state, and when the pleated tube (46) is fully expanded and stretched, the expanding member (40) drives the net (20) and the net skirt (30) to be in a fully expanded state; S3, the fish attracting member (21) in the net (20) works, and the fish enters the fish entrance space and the fish entrance and gradually enters the net (20); When fishing, the traction rope (70) drives the bottom net component (50) to rise, and under the action of the pulling rope (61), the lower end of the net skirt (30) moves downward and quickly approaches and contacts the bottom net component (50), completing the sealing of the fish entry space; when the net skirt (30) contacts the bottom net component (50), the net (20), the net skirt (30) and the bottom net component (50) form a closed fishing space, and the bottom net component (50) continues to move upward, gradually compressing the fishing space from bottom to top, so that the fish in the fishing space gradually gather upward to the upper part of the net (20); At the same time, the water injection pipe (44) can be used for drainage, and the multiple pleated tubes (46) are simultaneously contracted to a certain inner diameter, which can further gather the fish; S4, when the fish gather upward to the upper part of the net (20), the fish driving member (22) on one side of the net (20) is activated, and the fish can be driven to the output net pipe (23) on the other side, so that the fish are uniformly discharged from the output net pipe (23) for collection operation, completing a fishing operation; when the fishing is continued, the traction rope (70) drives the bottom net member (50) to continue to be lowered, and the net (20) and the net skirt (30) are gradually released from top to bottom during the movement of the bottom net member (50), forming a fishing space and a fish entry space.

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