Fish catching net cage suitable for deep water

Abstract

The utility model relates to the technical field of fishing net cages, and discloses a fish fishing net cage suitable for deepwater, which comprises a bottom plate, uniformly distributed connecting plates are fixedly connected to the outer wall of the top of the bottom plate, a top plate is fixedly connected to the tops of the connecting plates, and fixing plates are fixedly connected to the diagonal positions of the bottom plate and the top plate. And a driving assembly is arranged on the outer wall of the fixing plate and comprises a connecting frame, the connecting frame is fixedly connected to the top of the fixing plate, and a bolt is in threaded connection with the interior of the connecting frame. The folding frame is unfolded between the fixed disc and the movable disc through axial movement of the bolt and linkage of the fixed plate, the sliding block, the movable disc and other structures, an adjustable gap is formed in the net cage, the net cage fishing space is enlarged and the size of the gap is accurately controlled through dynamic adjustment of a mechanical structure, and the net cage fishing space is effectively improved. And small fishes can escape through gaps of the net cage and are prevented from being caught by mistake, so that the fry casualty rate is remarkably reduced.

Description

A fish trap suitable for deep water Technical Field

[0001] This utility model relates to the field of fishing cage technology, specifically a fish fishing cage suitable for deep water. Background Technology

[0002] Fish are the oldest vertebrates. They easily accumulate heavy metals. Offspring of hybrids with different chromosome numbers can still be fertile. They inhabit almost all aquatic environments on Earth, from freshwater lakes and rivers to saltwater seas and oceans. Fish are divided into two superclasses: Gnathostoma and Jawless. Gnathostoma includes Cyclostomata and Placoderms, while Jawless includes Placoderms, Chondrichthyes, and Actinopterygii. Most fish are cold-blooded vertebrates that live year-round in water, breathe with gills, and use fins for balance and movement. However, some, like African lungfish, mudskippers, and climbing perch, can survive on land for extended periods. Snakeheads, eels, and gars breathe through a single swim bladder. Although most fish are cold-blooded, many sharks and tuna are semi-warm-blooded, while moonfish are warm-blooded. There are more than 22,000 species of fish living in the world, accounting for more than half of the named vertebrates. New species of fish are constantly being discovered, averaging about 150 species per year, and more than 1,500 species have been added in the past ten years.

[0003] Since the mid-to-late 20th century, global wild fish catches have approached saturation (e.g., declining resources of commercially important fish such as cod and tuna). FAO data shows that in 2022, approximately 34% of global fish populations were overfished, prompting a shift towards intensive aquaculture. Net cages have become the core facility for large-scale aquaculture. Net cage aquaculture can increase yields through artificial feeding and density control, meeting market demand for high-quality protein (such as sea bass, grouper, and salmon). In 2022, global aquaculture production exceeded 120 million tons, of which net cage aquaculture accounted for approximately 30%.

[0004] If the spacing of traditional net cages is not adjustable, immature juvenile fish (such as sea bass fry and grouper fry less than 10cm in length) will be caught along with the fish during harvesting, directly reducing the reserve force for natural reproduction of the population. Taking the large yellow croaker in the East China Sea as an example, studies have shown that for every 10% increase in the accidental capture rate of juvenile fish, the natural recovery cycle of the population is extended by 2-3 years.

[0005] To address the aforementioned problems, a fish trap suitable for deep water is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a fish fishing cage suitable for deep water, which solves the problem in the background art that if the gaps of traditional cages are not adjustable, immature juvenile fish (such as bass fry and grouper fry with a body length of less than 10cm) will be caught together during the fishing, directly reducing the reserve force for natural reproduction of the population.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a fish fishing cage suitable for deep water, comprising a bottom plate, wherein evenly distributed connecting plates are fixedly connected to the top outer wall of the bottom plate, a top plate is fixedly connected to the top of the connecting plates, and fixing plates are fixedly connected to the bottom plate and the top plate at diagonal positions, and a driving assembly is provided on the outer wall of the fixing plate.

[0008] By adopting the above technical solution, the connecting plate is fixed by the top plate and the bottom plate to prevent the fish from getting out.

[0009] As a further description of the above technical solution: the drive assembly includes a connecting frame, which is fixedly connected to the top of the fixing plate, and the connecting frame is internally threaded with bolts.

[0010] By adopting the above technical solution, the bolts rotate inside the connecting frame.

[0011] As a further description of the above technical solution: a slider is fixedly connected to one end of the fixing plate.

[0012] By adopting the above technical solution, a slider is used for guidance.

[0013] As a further description of the above technical solution: the fixed plate is provided with evenly distributed movable disks.

[0014] By adopting the above technical solution, the moving disk moves on the outer wall of the slider.

[0015] As a further description of the above technical solution: the movable disk has a sliding groove inside, and the sliding groove is slidably connected to the slider.

[0016] By adopting the above technical solution, the moving disk moves along the slide.

[0017] As a further description of the above technical solution: a limiting block is fixedly connected to one end of the bottom of the fixing plate, and a fixing plate is fixedly connected to the top of the limiting block.

[0018] By adopting the above technical solution, limit control is achieved through limit blocks.

[0019] As a further description of the above technical solution: the outer walls of the fixed disk and the movable disk are provided with folding frames.

[0020] By adopting the above technical solution, the small fish are released using a folding frame.

[0021] As a further description of the above technical solution: a sliding plate is fixedly connected to one end of the movable disk, and the sliding plate is slidably connected to the connecting plate.

[0022] By adopting the above technical solution, the sliding plate moves.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] This utility model provides a fish trap suitable for deep water. First, the axial movement of bolts, through the linkage of structures such as a fixed plate, slider, and moving plate, causes the folding frame to unfold between the fixed plate and the moving plate, causing the net cage to form an adjustable gap. Through the dynamic adjustment of the mechanical structure, the fishing space of the net cage can be expanded and the gap size can be precisely controlled, allowing smaller fish to escape through the gaps in the net cage and avoiding accidental capture, thereby significantly reducing the mortality rate of fish fry. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 is a top view of the overall structure of this utility model;

[0027] Figure 3 is a structural schematic diagram of the folding frame of this utility model.

[0028] In the diagram: 1. Base plate; 2. Top plate; 3. Fixed plate; 4. Connecting plate; 5. Connecting frame; 6. Bolt; 7. Slider; 8. Slide groove; 9. Moving plate; 10. Sliding plate; 11. Folding frame; 12. Limiting block; 13. Fixed plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] To further understand the contents of this utility model, a detailed description of this utility model will be provided with reference to the accompanying drawings.

[0031] Referring to Figures 1-3, this utility model provides a fish fishing cage suitable for deep water.

[0032] The base plate 1 is a rectangular plate structure. Four evenly distributed connecting plates 4 are welded to the top outer wall. The connecting plates 4 extend upward perpendicularly to the base plate 1. The top plate 2 has the same shape and size as the base plate 1. The bottom is welded to the top of the connecting plates 4 to form a three-dimensional frame structure of the cage. At the four diagonal positions of the base plate 1 and the top plate 2, rectangular fixing plates 3 are fixed with bolts. The fixing plates 3 are set along the diagonal direction of the cage, and their length direction is parallel to the connecting plates 4.

[0033] Specific construction of driver components

[0034] Each fixed plate 3 has a welded connecting frame 5 at the top center. The connecting frame 5 is a U-shaped metal frame with the opening facing downwards. Threaded holes are opened on both sides of the frame. Bolts 6 pass through the threaded holes of the connecting frame 5 and form a threaded connection with the connecting frame 5. The bottom end of the bolts 6 can abut against the top surface of the fixed plate 3. A slider 7 is welded to the middle section of the fixed plate 3. The slider 7 is cylindrical and its axis is perpendicular to the length direction of the fixed plate 3. The movable disk 9 is a circular metal disk that is fitted on the fixed plate 3. There are 3-5 of them, which are evenly distributed along the length direction of the fixed plate 3. Each movable disk 9 has an internal groove 8 that matches the slider 7. The groove 8 is an arc-shaped groove that allows the movable disk 9 to slide along the slider 7. Each movable disk 9 has a sliding plate 10 fixed to the side facing the connecting plate 4 by welding. The sliding plate 10 is a rectangular plate with its length parallel to the connecting plate 4. The side wall of the connecting plate 4 has a vertical groove that matches the sliding plate 10. The sliding plate 10 is embedded in the groove, allowing the movable disk 9 to slide up and down along the connecting plate 4. The bottom end of the fixed plate 3 is fixed with a limiting block 12 by welding. The limiting block 12 is a rectangular block structure with a horizontal top surface. The fixed disk 13 is a circular metal disk that is fixed to the top of the limiting block 12 by bolts. The axis of the fixed disk 13 coincides with the axis of the fixed plate 3. The folding frame 11 is composed of multiple sets of metal rods connected by hinges, forming a foldable mesh structure. One end is fixed to the outer peripheral wall of the fixed plate 13 by bolts, and the other end is fixed to the outer peripheral wall of the movable plate 9 by bolts, so that the folding frame 11 is tensioned between the fixed plate 13 and the movable plate 9.

[0035] Specific implementation steps of dynamic adjustment structure

[0036] Operators use a wrench to rotate bolt 6, turning it clockwise or counterclockwise depending on the fishing requirements. Due to the limitation of the threaded hole of the connecting frame 5, the bolt 6 moves axially upward or downward. When the bolt 6 moves downward, its bottom end pushes the fixed plate 3 downward, causing the slider 7 to move downward synchronously. The slider 7 slides in the groove 8 of the moving plate 9, forcing the moving plate 9 to move along the fixed plate 3 towards the bottom fixed plate 13. Conversely, when the bolt 6 moves upward, the fixed plate 3 causes the slider 7 to move upward, and the moving plate 9 moves along the fixed plate 3 towards the top. When the moving plate 9 moves, the sliding plate 10 slides synchronously in the groove of the connecting plate 4, ensuring that the moving trajectory of the moving plate 9 is perpendicular to the bottom plate 1, avoiding tilting due to uneven force. When the moving plate 9 moves towards the fixed plate 13, the distance between the fixed plate 13 and the moving plate 9 decreases, the folding frame 11 retracts, and the mesh box gap size shrinks. When the moving plate 9 moves towards the top plate 2, the distance increases, the folding frame 11 unfolds, and the mesh box gap size expands. By adjusting the number of rotations of the bolt 6, the displacement distance of the moving plate 9 can be precisely controlled. For example, every time the bolt 6 is rotated once, the moving plate 9 moves by 0.5cm, and the gap size of the folding frame 11 increases by 1cm after it is unfolded, thereby enabling selective release of juvenile fish with a body length of <10cm.

[0037] Working principle: Depending on the water area, the operator starts the drive assembly by rotating the bolt 6. The axial movement of the bolt 6 within the connecting frame 5 drives the fixed plate 3 to move, which in turn causes the slider 7 to slide within the groove 8 of the moving plate 9, pushing the moving plate 9 outward along the fixed plate 3. The movement of the moving plate 9 causes the sliding plate 10 to slide on the connecting plate 4, while the folding frame 11 gradually unfolds between the fixed plate 13 and the moving plate 9. The fishing space of the net cage continuously expands. As the folding frame 11 unfolds, the net cage forms larger gaps, allowing smaller fish to escape, reducing the mortality rate of fish fry, truly achieving the goal of catching the big and keeping the small, protecting resources, and realizing sustainable development.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fish trap suitable for deep water, comprising a bottom plate (1), characterized in that: The bottom plate (1) is fixedly connected to the top outer wall of the top plate (4) with evenly distributed connecting plates (4), and the top plate (2) is fixedly connected to the top of the connecting plates (4). The bottom plate (1) and the top plate (2) are fixedly connected to the diagonal positions of the top plate (2) with fixing plates (3). The outer wall of the fixing plates (3) is provided with driving components.

2. The fish trap suitable for deep water according to claim 1, characterized in that: The drive assembly includes a connecting frame (5), which is fixedly connected to the top of the fixing plate (3), and the connecting frame (5) is internally threaded with bolts (6).

3. A fish trap suitable for deep water according to claim 1, characterized in that: A slider (7) is fixedly connected to one end of the fixed plate (3).

4. A fish trap suitable for deep water according to claim 1, characterized in that: The fixed plate (3) is provided with evenly distributed movable disks (9).

5. A fish trap suitable for deep water according to claim 4, characterized in that: The movable disk (9) has a sliding groove (8) inside, and the sliding groove (8) is slidably connected to the slider (7).

6. A fish trap suitable for deep water according to claim 1, characterized in that: The bottom end of the fixed plate (3) is fixedly connected to a limiting block (12), and the top of the limiting block (12) is fixedly connected to a fixed plate (13).

7. A fish trap suitable for deep water according to claim 6, characterized in that: The outer walls of the fixed disk (13) and the movable disk (9) are provided with folding frames (11).

8. A fish trap suitable for deep water according to claim 4, characterized in that: The movable disk (9) is fixedly connected to a sliding plate (10) at one end, and the sliding plate (10) is slidably connected to the connecting plate (4).

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