A marine fish surveying and trapping apparatus and method of use

Abstract

The application discloses a marine fish investigation trapping device and a use method, which comprises a trapping tank, the top end of the trapping tank is designed as an opening, a fixed net cover is fixedly arranged in the upper cavity opening of the trapping tank, a motor is fixedly arranged at the top center of the fixed net cover, a supporting mechanism is movably arranged on the lower bottom of the trapping tank, an automatic discharging mechanism is arranged in the inner wall between the lower bottom of the trapping tank and the inner cavity bottom, a plurality of inlet mechanisms are threadedly arranged on the outer wall of the trapping tank, a docking mechanism is arranged on the top end of the trapping tank, when the trapping tank is hoisted to the shore to prepare for discharging fish, a plurality of threaded installation holes are blocked by a ring-shaped blocking piece, so that the marine fish in the trapping tank cannot jump out and escape, and only the square discharging opening is allowed to discharge fish, and the ring-shaped blocking piece also pulls open the square blocking plate, so that the square discharging opening can be automatically opened, and the discharging of fish is automatically completed, and the application has the characteristics of convenient use.

Description

Technical Field

[0001] This invention relates to the field of marine fish survey and trapping technology, specifically to a marine fish survey and trapping device and its usage method. Background Technology

[0002] Marine fish are distributed from the poles to the equator, from coastlines to the open ocean, and from the surface to the deepest abyss at depths of approximately 10,000 meters. This diversity of habitats contributes to the diversity of marine fish. However, due to their similar lifestyles, they share a series of common characteristics: gills for breathing dissolved oxygen in water, fin-like limbs for movement in the water, and skin that secretes mucus to reduce drag. Furthermore, they also exhibit unique characteristics in body structure, reproduction, growth, feeding, and locomotion.

[0003] Marine life traps are marine instruments used in the field of biology. Traditional marine life traps are devices that use food, light sources, and sonar to trap single or combined species. However, during use, multiple marine fish are caught at once. When these fish are trapped in the cage, they are squeezed and collide with each other, which can easily cause injury or even death, hindering research. Furthermore, the collisions between these fish can block the original trap entrance, preventing subsequent fish from being trapped. In addition, when the trap is hoisted ashore and the fish need to be opened, it requires additional operation, which is cumbersome. Also, the mixing of fish makes it difficult to classify and categorize them, resulting in many inconveniences in use. Summary of the Invention

[0004] The purpose of this invention is to provide a marine fish survey and trapping device and a method of using it, so as to solve the technical problems in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A marine fish survey and trapping device includes a trapping tank with an open top. A fixed net cover is embedded and fixedly installed in the upper cavity of the trapping tank. A motor is fixedly installed at the center of the top of the fixed net cover. A support mechanism is movably installed on the lower bottom of the trapping tank. An automatic feeding mechanism is embedded in the inner wall between the lower bottom and the bottom of the inner cavity of the trapping tank. Several inlet mechanisms are threaded on the outer wall of the trapping tank. A docking mechanism is installed at the top of the trapping tank.

[0007] As a further aspect of the present invention: a receiving cavity is provided in the inner wall between the outer ring wall and the inner cavity wall of the trapping tank; a number of threaded mounting holes of the same specification and distributed in an equally spaced annular array are provided through the receiving cavity in the outer ring wall of the trapping tank; a square discharge port is provided through the bottom of the inner cavity of the trapping tank; an insertion port is provided in one inner cavity wall of the square discharge port; and an insertion cavity is provided in the other inner cavity wall of the square discharge port.

[0008] As a further embodiment of the present invention: the output end of the motor is equipped with a drive shaft, the drive shaft extends through the fixed mesh cover into the inner cavity of the trapping tank, and is rotatably mounted at the center of the bottom of the inner cavity of the trapping tank. The outer shaft wall of the drive shaft is fixedly fitted with a shaft cylinder, and several square mesh frames of the same specifications and arranged in a circular array with equal spacing are vertically fixedly installed on the outer wall of the shaft cylinder. Square metal meshes are embedded between the two opposite outer walls of the square mesh frames, and the motor is electrically connected to a connecting cable.

[0009] As a further embodiment of the present invention: the support mechanism includes an annular sealing member, which is vertically and movably inserted into the receiving cavity. The inner and outer annular walls of the annular sealing member are fixedly installed with retaining rings at the same horizontal line. The two retaining rings are arranged to abut against the bottom of the receiving cavity. A plurality of support rods are vertically fixedly installed on the bottom of the annular sealing member, and the bottom ends of the plurality of support rods are vertically fixedly installed with rubber bases.

[0010] As a further aspect of the present invention: the automatic feeding mechanism includes a square sealing plate, which is slidably inserted into the insertion cavity. Two springs are vertically mounted on one end of the square sealing plate, and the ends of the two springs away from the square sealing plate are fixedly installed in the insertion cavity. Two pull ropes are vertically fixedly connected to the ends of the square sealing plate near the two springs. Two fixed pulleys are provided at the ends of the two springs away from the square sealing plate. The two fixed pulleys are rotatably installed in the insertion cavity. The two pull ropes pass through the corresponding springs and around the corresponding fixed pulleys, and finally extend into the receiving cavity and are connected to the bottom end of the retaining ring.

[0011] As a further embodiment of the present invention: each of the aforementioned inlet mechanisms includes an inlet bucket, and a connecting cylinder is fixedly installed at one end of each of the aforementioned inlet buckets near the trapping tank. Each of the aforementioned connecting cylinders is threadedly inserted into a corresponding threaded mounting hole. Each of the aforementioned inlet buckets has an inlet opening at one end. A limiting ring is fixedly installed on the inner wall of the inlet opening. A circular mesh frame is threadedly fitted inside each of the aforementioned inlet openings. One side of each of the aforementioned circular mesh frames is respectively abutted against the corresponding limiting ring. Circular metal meshes are embedded in both sides of the aforementioned circular mesh frames. The aforementioned circular metal meshes are flush with the corresponding inlet opening.

[0012] As a further aspect of the present invention: the docking mechanism includes a plurality of steel cables, one end of which is connected at equal intervals to the top of the trapping tank, the top ends of which are connected to a connector, a lifting ring is vertically fixedly installed at the top of the connector, and the other end of the connecting cable passes through the connector and extends to both sides of the lifting ring.

[0013] A method for using a marine fish survey and trapping device includes three steps: water preparation, fish attraction and trapping, and lifting the fish out of the water, as detailed below:

[0014] Water entry preparation: First, put the bait into the inner cavity of the trapping tank through the square feeding port. Then, thread the appropriately shaped entry buckets into the corresponding threaded mounting holes through the connecting sleeves. Thread the circular mesh frame surrounding the appropriate diameter circular metal mesh into the entrance of the entry bucket, ensuring the circular metal mesh is flush with the entrance to avoid scratches and damage. Then, connect the lifting ring to the detachable pins of the lifting equipment such as the cable winch, and place the trapping device into the seawater. Release the lifting equipment's cable to begin lowering the trapping device into the target depth of the seawater.

[0015] Fishing Trapping: When this trapping device is placed in seawater, the annular sealing element will naturally descend due to its own weight, lowering its height within the trapping tank's receiving cavity. Simultaneously, the retaining rings on the inner and outer walls of the annular sealing element will also descend until they contact the bottom of the receiving cavity, thus maintaining the annular sealing element in a relatively fixed position relative to the trapping tank. Since the annular sealing element has descended, the square sealing plate is no longer pulled by the rope. At this point, the previously compressed spring begins to stretch elastically. Because one end is fixed, the other end pushes the square sealing plate to slide into the square feeding port, ultimately inserting it into the slot and completely sealing the square feeding port, preventing marine fish from escaping. Marine fish will pass through the circular metal mesh with meshes smaller than the mesh size. Therefore, a circular metal mesh with an appropriate mesh size can be selected according to the waist circumference of the target marine fish. The fish will then enter the inlet bucket, pass through the connecting tube, and finally enter the trapping tank. At the same time, the motor is started, which drives the shaft to rotate the shaft tube, which in turn drives several square mesh frames and square metal meshes to rotate at a low speed of one revolution per second. At this time, the marine fish that have entered the trapping tank from several inlet buckets will be forced to separate and evenly distributed between several adjacent square metal meshes. Since the marine fish will also swim and the square metal meshes are rotating at a low speed, they will not be seriously damaged.

[0016] Lifting from the water: Using lifting equipment such as a cable winch, the steel cable is wound up to lift the trapping device ashore. Since the rubber bases at the bottom of the annular sealing element are the lowest, they are the first to contact the ground. After contact with the ground, the trapping device continues to descend, causing the annular sealing element and the trapping tank to slide relative to each other. At this time, the annular sealing element rises within the receiving cavity, and the inner and outer retaining rings rise synchronously until they contact the connecting cylinders. At this point, the trapping device is stable, and the annular sealing element slides... The device rises to a designated position, where a ring-shaped sealing element blocks several threaded mounting holes, preventing marine fish inside the trap from escaping through these holes. Fish are only allowed to exit through the square discharge port below. During the sliding ascent, two ropes pull the square sealing plate back into the cavity from the square discharge port, compressing and deforming the corresponding spring to provide elastic restoring force. At this point, the square discharge port opens automatically, allowing marine fish between two adjacent square metal nets to be released from the discharge port.

[0017] The beneficial effects of this invention are:

[0018] First, a trapping tank is set up, with a motor installed at the top. The motor drives multiple evenly distributed square metal meshes inside the trapping tank to rotate slowly and uniformly. This separates the marine fish that enter the trapping tank from several entrance mechanisms into adjacent square metal meshes, preventing them from being squeezed and collided together, which could cause injury or even death. This is beneficial for research. Furthermore, since these marine fish do not collide with each other, they are less likely to block the original trapping entrance, thus preventing subsequent marine fish from being trapped and facilitating the normal entry of marine fish into the tank.

[0019] Secondly, a square discharge port is opened at the bottom of the trapping tank for releasing marine fish between two adjacent square metal nets. A square sealing plate is installed inside the square discharge port. The square sealing plate is connected to an annular sealing component through a related linkage structure. The annular sealing component can move up and down inside the trapping tank. When the trapping tank is hoisted to the shore for fish release, the annular sealing component seals several threaded mounting holes, thus preventing marine fish from jumping out of the trapping tank and allowing them to be released only through the square discharge port. The annular sealing component also pulls open the square sealing plate, so that the square discharge port can be opened automatically, and the fish release can be completed automatically, which is convenient to use. Attached Figure Description

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a front cross-sectional view of the present invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0024] Figure 4 This is a bottom view of the trapping tank structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the drive shaft mounting structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the support mechanism structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the automatic feeding mechanism of the present invention;

[0028] Figure 8 This is a schematic diagram of the entry mechanism structure of the present invention.

[0029] In the picture:

[0030] 1. Trapping container; 11. Storage cavity; 12. Threaded mounting hole; 13. Square discharge port; 14. Insertion port; 15. Insertion cavity;

[0031] 2. Fix the mesh cover;

[0032] 3. Motor; 31. Drive shaft; 32. Shaft sleeve; 33. Square mesh frame; 34. Square metal mesh; 35. Connecting cable;

[0033] 4. Support mechanism; 41. Annular sealing component; 42. Retaining ring; 43. Support rod; 44. Rubber base;

[0034] 5. Automatic feeding mechanism; 51. Square sealing plate; 52. Spring; 53. Pull rope; 54. Fixed pulley;

[0035] 6. Entrance mechanism; 61. Entrance bucket; 62. Connecting cylinder; 63. Limiting ring; 64. Circular mesh frame; 65. Circular metal mesh;

[0036] 7. Connecting mechanism; 71. Steel cable; 72. Connector; 73. Lifting ring. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1-8 As shown, a marine fish survey trapping device includes a trapping tank 1. The top of the trapping tank 1 is open, and a fixed net cover 2 is embedded and fixedly installed in the upper cavity of the trapping tank 1. (See the attached instruction manual.) Figure 2 It can be seen that the top of the fixed net cover 2 has several mesh holes through the bottom to facilitate the entry of seawater, which also facilitates the entry of this trapping equipment into the water. The motor 3 is fixedly installed at the center of the top of the fixed net cover 2. The motor 3 is a high-pressure resistant and seawater corrosion resistant motor. The bottom of the trapping tank 1 is equipped with a support mechanism 4 for lifting and lowering. An automatic feeding mechanism 5 is embedded in the inner wall between the bottom of the trapping tank 1 and the bottom of the inner cavity. Several inlet mechanisms 6 are threaded on the outer wall of the trapping tank 1. A docking mechanism 7 is installed at the top of the trapping tank 1.

[0039] like Figure 2-5 As shown, particularly noteworthy is that a receiving cavity 11 is formed in the inner wall between the outer ring wall and the inner cavity wall of the trapping tank 1. The receiving cavity 11 is a ring-shaped closed space. Several threaded mounting holes 12 of the same specifications and evenly spaced in a ring array are formed through the receiving cavity 11 in the outer ring wall of the trapping tank 1. The threaded mounting holes 12 are the only passage for marine fish to enter the trapping tank 1 from the entry bucket 61. A square discharge port 13 is formed through the bottom of the inner cavity of the trapping tank 1. The square discharge port 13 can smoothly release marine fish between two adjacent square metal meshes 34 at a uniform speed. An insertion port 14 is formed in the inner wall of the square discharge port 13 to improve the installation stability of the square sealing plate 51. 3 Another inner cavity wall has an insertion cavity 15. The output end of the motor 3 is equipped with a drive shaft 31. The drive shaft 31 passes through the fixed net cover 2 and extends into the inner cavity of the trap 1. It is rotatably installed at the center of the bottom of the inner cavity of the trap 1. The outer shaft wall of the drive shaft 31 is fixedly fitted with a shaft cylinder 32. Several square net frames 33 of the same specifications are vertically fixedly installed on the outer wall of the shaft cylinder 32 and are distributed in a circular array with equal spacing. Square metal mesh 34 is embedded between the two opposite outer walls of the square net frames 33. The square metal mesh 34 does not contact the inner cavity wall of the trap 1, but the reserved gap is very small, so that marine fish will not escape from the gap. The motor 3 is electrically connected to a connecting cable 35.

[0040] like Figure 6As shown, the support mechanism 4 includes an annular sealing member 41, which is inserted into the receiving cavity 11 in a vertical and movable manner. The inner and outer ring walls of the annular sealing member 41 are fixedly installed with retaining rings 42 at the same horizontal line. The retaining rings 42 enable the annular sealing member 41 to always move up and down within the trapping tank 1 and not slip out. The two retaining rings 42 are set to abut against the bottom of the receiving cavity 11. Several support rods 43 are vertically fixedly installed on the bottom of the annular sealing member 41. The bottom of the several support rods 43 are vertically fixedly installed with rubber bases 44, which have a certain shock absorption and buffering effect, reducing the vibration of marine fish when they descend.

[0041] like Figure 7 As shown, particularly noteworthy is that the automatic feeding mechanism 5 includes a square sealing plate 51, which is slidably inserted into the cavity 15. Two springs 52 are vertically mounted on one end of the square sealing plate 51, providing the square sealing plate 51 with the power to reset, ensuring that during fishing, the square sealing plate 51 is sealed at the square feeding port 13. The ends of the two springs 52 away from the square sealing plate 51 are fixedly installed in the cavity 15, and the ends of the square plate 51 near the two springs 52 are vertically fixed. Two pull ropes 53 are connected. Two fixed pulleys 54 are set at the ends of the two springs 52 away from the square sealing plate 51. The fixed pulleys 54 can change the direction of the pull ropes 53 and reduce the wear of the pull ropes 53. Both fixed pulleys 54 are rotatably installed in the insertion cavity 15. The two pull ropes 53 pass through the corresponding springs 52 and go around the corresponding fixed pulleys 54, and finally extend into the storage cavity 11 and are connected to the bottom of the retaining ring 42. When the retaining ring 42 rises and falls with the annular sealing part 41, it will pull or release the pull ropes 53 synchronously.

[0042] like Figure 8 As shown, particularly noteworthy is that each of the several inlet mechanisms 6 includes an inlet bucket 61, and each of the several inlet buckets 61 has a connecting tube 62 fixedly installed at one end near the trap jar 1. Each of the several connecting tubes 62 is threaded into the corresponding threaded mounting hole 12. Therefore, the entire inlet mechanism 6 can be disassembled and replaced individually, or a suitable model of inlet mechanism 6 can be replaced according to the type of fish to be caught. Each of the several inlet buckets 61 has an inlet opening at one end, and a limiting ring 63 is fixedly installed on the inner wall of the inlet opening. Each of the several inlet openings has a circular mesh frame 64 threadedly fitted inside, and one side of each of the several circular mesh frames 64 is respectively set to abut against the corresponding limiting ring 63. Circular metal mesh 65 is embedded in both sides of each of the several circular mesh frames 64. The aperture of the circular metal mesh 65 can be adapted to the waist circumference of the target fish. The several circular metal mesh 65 is set flush with the corresponding inlet mouth opening to avoid scratching.

[0043] like Figure 1As shown, the docking mechanism 7 includes several steel cables 71, one end of which is connected at equal intervals to the top of the trapping tank 1. The top ends of the steel cables 71 are connected to a connector 72. A lifting ring 73 is vertically fixed to the top of the connector 72. The other end of the connecting cable 35 passes through the connector 72 and extends to both sides of the lifting ring 73 to prevent the connecting cable 35 from being scattered, tangled, or knotted.

[0044] 8. A method for using a marine fish survey and trapping device, characterized by comprising three steps: water preparation, fish attraction, and retrieval from the water, as detailed below:

[0045] Water entry preparation: First, put the bait into the inner cavity of the trapping tank 1 through the square feeding port 13. Then, thread the appropriately shaped entry bucket 61 into the corresponding threaded mounting hole 12 through the connecting cylinder 62. Thread the circular mesh frame 64 surrounding the circular metal mesh 65 of appropriate diameter into the entrance of the entry bucket 61, making sure that the circular metal mesh 65 is flush with the entrance to avoid scratching and damage. Then, connect the lifting ring 73 to the detachable pin of the lifting equipment (such as a cable winch), and put the trapping device into the seawater. Then release the steel cable of the lifting equipment to begin placing the trapping device into the seawater at the target depth.

[0046] Induced Fishing: When this trapping device is placed in seawater, the annular sealing member 41 will naturally fall due to its own weight, that is, its height will decrease within the receiving cavity 11 of the trapping tank 1. At the same time, the retaining rings 42 on the inner and outer ring walls of the annular sealing member 41 will also descend synchronously until they abut against the bottom of the lower cavity 11, thus keeping the annular sealing member 41 in a relatively fixed position relative to the trapping tank 1. Meanwhile, since the annular sealing member 41 has descended, the pull rope 53 no longer pulls the square sealing plate 51. At this time, the spring 52, which was originally compressed and deformed, begins to stretch elastically. Since one end is fixed, the other end pushes the square sealing plate 51 to slide into the square feeding port 13, and finally into the insertion port 14, completely sealing the square feeding port 13 and preventing marine fish from escaping. Marine fish will pass through the mesh of the circular metal mesh 65 (the mesh size of the circular metal mesh 65 is smaller than that of the target marine fish, so the appropriate mesh size of the circular metal mesh 65 can be selected according to the waist circumference of the target marine fish) and enter the inlet 61. After passing through the connecting tube 62, they finally enter the trap 1. At the same time, the motor 3 is started, which drives the shaft tube 32 through the drive shaft 31, that is, drives several square mesh frames 33 and square metal mesh 34 to rotate at a low speed (one revolution per second). At this time, the marine fish that have entered the inner cavity of the trap 1 from several inlet 61 will be forced to separate and evenly distributed between several adjacent square metal meshes 34. Since the marine fish will also swim and the square metal meshes 34 rotate at a low speed, they will not be seriously damaged.

[0047] Lifting out of the water: The hoisting equipment (such as a cable winch) begins to wind up the steel cable, thereby lifting the trapping device ashore. Since the rubber bases 44 at the bottom of the annular sealing member 41 are the lowest, they are the first to contact the ground. After contact with the ground, the height of the trapping device continues to decrease, causing the annular sealing member 41 to slide relative to the trapping tank 1. At this time, the annular sealing member 41 will rise in height within the receiving cavity 11, and the inner and outer retaining rings 42 will also rise synchronously until they contact the connecting cylinders 62. At this point, the trapping device is placed stably, and the annular sealing member 41 slides upward. Upon reaching the designated position, the annular sealing member 41 seals several threaded mounting holes 12, thereby preventing marine fish entering the trap 1 from jumping out of the threaded mounting holes 12 and allowing them to be released only from the square discharge port 13 below. During the sliding upward process, the square sealing plate 51 is pulled from the square discharge port 13 back into the insertion cavity 15 by two pull ropes 53, and the corresponding spring 52 is compressed and deformed to obtain elastic restoring force. At this time, the square discharge port 13 is unobstructed and automatically opens to facilitate the release and unloading of marine fish between two adjacent square metal meshes 34 from the square discharge port 13.

[0048] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A marine fish survey trapping device, comprising a trapping tank, the top of which is open, and a fixed net cover is embedded and fixedly installed in the upper cavity of the trapping tank, characterized in that, A motor is fixedly installed at the center of the top of the fixed net cover. A support mechanism is installed to lift and move the bottom of the trapping tank. An automatic feeding mechanism is embedded in the inner wall between the bottom of the trapping tank and the bottom of the inner cavity. Several inlet mechanisms are threaded on the outer wall of the trapping tank. A docking mechanism is installed at the top of the trapping tank. A receiving cavity is provided in the inner wall between the outer ring wall and the inner cavity wall of the trapping tank. The outer ring wall of the trapping tank has several threaded mounting holes of the same specifications and distributed in an equally spaced ring array through the receiving cavity. A square feeding port is provided through the bottom of the inner cavity of the trapping tank. An insertion port is provided in one inner cavity wall of the square feeding port, and an insertion cavity is provided in the other inner cavity wall of the square feeding port. The motor output end is equipped with a drive shaft, which extends through the fixed mesh cover into the inner cavity of the trapping tank and is rotatably mounted at the center of the bottom of the trapping tank. A shaft sleeve is fixedly fitted on the outer shaft wall of the drive shaft. Several square mesh frames of the same specifications are vertically fixedly installed on the outer wall of the shaft sleeve and are arranged in a circular array with equal spacing. Square metal mesh is embedded between the two opposite outer walls of the square mesh frames. The motor is electrically connected to a connecting cable. The support mechanism includes an annular sealing component, which is movably inserted into the storage cavity. The inner and outer ring walls of the annular sealing component are fixedly installed with retaining rings at the same horizontal line. The two retaining rings are set to abut against the bottom of the storage cavity. Several support rods are vertically fixedly installed on the bottom of the annular sealing component, and rubber bases are vertically fixedly installed on the bottom of the several support rods. The automatic feeding mechanism includes a square sealing plate, which is slidably inserted into the insertion cavity. Two springs are vertically mounted on one end of the square sealing plate, and the ends of the two springs away from the square sealing plate are fixedly installed in the insertion cavity. Two pull ropes are vertically fixedly connected to the ends of the square sealing plate near the two springs. Two fixed pulleys are set on the ends of the two springs away from the square sealing plate, and the two fixed pulleys are rotatably installed in the insertion cavity. The two pull ropes pass through the corresponding springs and around the corresponding fixed pulleys, and finally extend into the receiving cavity and are connected to the bottom of the retaining ring.

2. A marine fish survey and trapping device according to claim 1, characterized in that, Each of the several inlet mechanisms includes an inlet bucket. Each of the several inlet buckets has a connecting cylinder fixedly installed at one end near the trapping tank. Each of the several connecting cylinders is threaded into a corresponding threaded mounting hole. Each of the several inlet buckets has an inlet opening at one end. A limiting ring is fixedly installed on the inner wall of the inlet opening. Each of the several inlet openings has a circular mesh frame threadedly fitted inside. One side of each of the several circular mesh frames is respectively set to abut against the corresponding limiting ring. Circular metal meshes are embedded in both sides of each of the several circular mesh frames. The several circular metal meshes are set flush with the corresponding inlet opening.

3. A marine fish survey and trapping device according to claim 2, characterized in that, The docking mechanism includes several steel cables, one end of which is connected at equal intervals to the top of the trapping tank. The top ends of the steel cables are connected to a connector, and a lifting ring is vertically fixed to the top of the connector. The other end of the connecting cable passes through the connector and extends to both sides of the lifting ring.

4. A method of using a marine fish survey trapping device, applied to the trapping device according to any one of claims 1-3, characterized in that, The usage process includes three steps: water preparation, fish attraction, and hauling the fish out of the water, as detailed below: Water entry preparation: First, put the bait into the inner cavity of the trapping tank through the square feeding port. Then, thread the appropriately shaped entry buckets into the corresponding threaded mounting holes through the connecting sleeves. Thread the circular mesh frame surrounding the appropriate diameter circular metal mesh into the entrance of the entry bucket, ensuring that the circular metal mesh is flush with the entrance to avoid scratches and damage. Then, connect the lifting ring to the detachable pin of the lifting equipment and place the trapping device into the seawater. Release the steel cable of the lifting equipment to begin placing the trapping device into the seawater at the target depth. Induced Fishing: When this trapping device is placed in seawater, the annular sealing element will naturally sink due to its own weight, lowering its height within the trapping tank's receiving cavity. Simultaneously, the retaining rings on the inner and outer walls of the annular sealing element will also descend until they contact the bottom of the receiving cavity, thus maintaining the annular sealing element in a relatively fixed position relative to the trapping tank. Since the annular sealing element has descended, the square sealing plate is no longer pulled by the rope. At this point, the previously compressed spring begins to stretch elastically. Because one end is fixed, the other end pushes the square sealing plate to slide into the square discharge port, ultimately inserting it... The inlet completely blocks the square feeding port, preventing marine fish from escaping. The marine fish will pass through the mesh of the circular metal mesh and enter the inlet hopper, then through the connecting cylinder and finally into the trap tank. At the same time, the motor is started, and the drive shaft drives the shaft cylinder, which in turn drives several square mesh frames and square metal meshes to rotate at a low speed. At this time, the marine fish that have entered the trap tank from several inlet hoppers will be forced to separate and evenly distributed between several adjacent square metal meshes. Since the marine fish will also swim and the square metal meshes rotate at a low speed, they will not be seriously damaged. Lifting out of the water: The hoisting equipment begins to wind up the steel cable, thereby lifting the trapping device ashore. Since the rubber bases at the bottom of the annular sealing component are the lowest, they are the first to contact the ground. After contact with the ground, the height of the trapping device continues to decrease, causing the annular sealing component and the trapping tank to slide relative to each other. At this time, the annular sealing component will rise in height within the receiving cavity, and the inner and outer retaining rings will also rise synchronously until they abut against several connecting cylinders. At this point, the trapping device is placed stably, and the annular sealing component slides up to the designated position, sealing several threaded mounting holes. This prevents marine fish entering the trapping tank from jumping out of the threaded mounting holes and escaping, allowing them to be released only from the square discharge port below. During the sliding upward process, two pull ropes will pull the square sealing plate from the square discharge port back into the insertion cavity, causing the corresponding spring to be compressed and deformed to obtain elastic restoring force. At this time, the square discharge port is unobstructed and automatically opens to facilitate the release and unloading of marine fish between two adjacent square metal nets.

Images