Sorting fishing gear for survey of fishery resources and use method of sorting fishing gear

Abstract

The invention relates to the technical field of fishing gear correlation, and discloses a sorting fishing gear for fishery resource investigation and a use method thereof.The sorting fishing gear comprises a sorting fishing gear body and a storage box, a driving motor is fixedly connected to the top of the sorting fishing gear body, and a threaded rod is fixedly connected to the side face of the driving motor; the other side face of the threaded rod is rotationally connected with the sorting fishing gear, the threaded rod is in threaded connection with a driving plate, and the inner side face of the driving plate is fixedly connected with a connecting side plate, a sorting device and a center connecting plate. The device is provided with the classifying device, the connecting box body is arranged on the classifying device, the motor drives the classifying device to move back and forth in the sorting fishing gear, the control panel adjusts the gap between the connecting box body and the side face structure in the reciprocating motion, and the body types of fish schools are classified through the gaps among the classifying device, the connecting side plate and the center connecting plate; and the classified fishes are driven into the storage box, the classification speed is high, and the efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of fishing gear, and specifically to a sorting fishing gear for fishery resource investigation and its usage method. Background Art

[0002] Fishery resource investigation refers to the investigation of the reproduction, growth, death, migration, distribution, quantity, habitat environment, prospects and means of exploitation and utilization of biological individuals or groups in waters, and is a basic work for carrying out fishery catches and fishery resource management. Fishery resource investigation can be mainly divided into two categories: management investigation and development investigation. The former is carried out for the developed fishing grounds, aiming to rationally utilize resources to obtain the maximum sustainable yield.

[0003] Publication No. CN113812369A discloses a sorting fishing gear for fishery resource investigation and its usage method. The fishing gear includes a net bag unit provided with an inflation unit. The net bag unit is divided into an inlet net bag, a screening net bag, and a collection net bag that are sequentially connected. The outside of the collection net bag is connected to a sorting unit. The sorting unit includes a rotating shaft and a support member disposed at one end on the rotating shaft. A petal-shaped net bag wall is provided outside the collection net bag. The end of the petal-shaped net bag wall is movably connected to the support member through a second connecting portion. When the petal-shaped net bag wall is separated from the support member, the end of the petal-shaped net bag wall can be closed. By setting an inflation unit, the present invention realizes the adjustment of the size of the fishing gear outlet, and then classifies the catch, thereby shortening the operation time of fishery resource investigation and having good promotion prospects.

[0004] In order to obtain resource data of fishery organisms, fishery resource investigation needs to use fishing gear for fishing, and then measure and count after being identified and distinguished by professionals. However, the catch entering the fishing gear is mixed. If classification is not timely, it will lead to mutual predation among fish schools, and then produce residues after the death of organisms. The residues will accelerate the corruption of water quality, affect the survival of more organisms in the fishing gear, and reduce the accuracy of the investigation results. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a sorting fishing gear for fishery resource investigation and its usage method to solve the problems existing in the above-mentioned background art.

[0006] The present invention provides the following technical solutions: A sorting fishing gear for fishery resource investigation includes a sorting fishing gear and a storage box. A driving motor is fixedly connected to the top of the sorting fishing gear. A threaded rod is fixedly connected to the side of the driving motor. The other side of the threaded rod is rotatably connected to the sorting fishing gear. A driving plate is threadedly connected to the threaded rod. A connecting side plate, a classification device, and a central connecting plate are fixedly connected to the inner side of the driving plate.

[0007] The classification device includes a device housing. A top gear is rotatably connected to the top of the device housing. A connecting side plate is meshed and connected to the side of the top gear. A connecting rod is rotatably connected to the top of the central connecting plate. The connecting side plate is arranged on the connecting rod and fixedly connected to the connecting rod. A gear rod is fixedly connected to the bottom of the top gear. A rack is meshed and connected to the side of the gear rod. A connecting box body is fixedly connected to the side of the rack. A driving wheel is fixedly connected to the side of the connecting rod. A control board is movably connected to the bottom of the driving wheel;

[0008] During use, the driving motor rotates forward to drive the threaded rod to rotate. The threaded rod drives the driving plate threadedly connected thereto to move horizontally inside the sorting fishing gear. There is a fish school placed on the side of the sorting fishing gear away from the storage box. The driving plate drives the connecting side plate, the classification device and the central connecting plate fixedly connected to the inner side to move forward in the direction of the fish school. Eligible fish will swim through the gaps at both ends of the classification device to one end of the sorting fishing gear close to the storage box. Subsequently, the driving motor rotates in reverse, driving the classification device, the connecting side plate and the central connecting plate to move in the reverse direction, driving the sorted fish into the storage box.

[0009] Furthermore, the connecting box body is of a hollow structure. An adjusting block is sleeved inside the connecting box body. A number of water troughs are provided on the connecting box body. One end of the adjusting block facing outward is of a fan-shaped structure, and the fan surface faces the direction of the storage box. One end of the adjusting block facing inward is of a cuboid structure, and the inner wall is movably connected to the connecting box body. Water troughs are also provided on the fan surface of the adjusting block. The inclined surface of the adjusting block is of a closed structure.

[0010] Furthermore, the sorting fishing gear and the storage box are fixedly connected. A connecting groove is provided between the sorting fishing gear and the storage box. The opening position of the connecting groove deviates from the center of the sorting fishing gear and the storage box.

[0011] Furthermore, connecting rods are fixedly connected in the middle of the classification device, the connecting side plate and the central connecting plate and are fixedly connected together by the connecting rods. The connecting side plate is movably connected to the sorting fishing gear.

[0012] Furthermore, the control board includes a support rod. A rotating shaft is rotatably connected to the side of the support rod. A support connecting block is rotatably connected to the side of the rotating shaft. A spring damping device is fixedly connected inside the support connecting block. A moving block is fixedly connected to the top of the spring damping device. The moving block is movably connected to the support connecting block.

[0013] Furthermore, a control device is arranged inside the support rod, which can control the rotation of the support connecting block. By controlling the number of support connecting blocks vertically upward on the support rod, the rotation angle of the driving wheel after each contact is controlled, and thus the opening size of the connecting box body during each classification is controlled.

[0014] Further, the storage box includes a box body shell, a connecting seat is fixedly connected to the center of the bottom of the box body shell, a baffle is rotatably connected to the connecting seat, a limiting block is fixedly connected to the inner wall of the bottom of the box body shell, a spring damper is fixedly connected to the outer side surface of the bottom of the baffle, a movable block is fixedly connected to the side surface of the spring damper, and the movable block is movably connected to the limiting block, so that the baffle rotates in a single direction.

[0015] During use, the driving motor drives the driving plate to move towards the fish school. At this time, the water at the position of the sorting device will accumulate at the device shell as the sorting device moves. Part of the water flows out towards the storage box from the water grooves on the connecting box body and the adjusting block. The water grooves opened on the adjusting block make the water flow rate at the connecting box body in the direction of the storage box larger. The water flow rate inside the connecting box body is greater than the water flow rate on the outer side surface of the adjusting block. According to Bernoulli's principle, the pressure on the outer side surface of the adjusting block is greater than the pressure inside the connecting box body, and the water flow will flow from the side surface of the adjusting block into the inside of the connecting box body, so that the adjusting block is in a contracted state when moving towards the fish school. When the sorting device moves in the reverse direction, the pressure on the outer side surface of the adjusting block is less than the pressure inside the connecting box body, and the water flow that has moved into the inside of the connecting box body will push the adjusting block outwards, so that the adjusting block contacts the central connecting plate or the connecting side plate on the side, blocking the fish from swimming back through the gaps between the sorting device and the connecting side plate and between the sorting device and the central connecting plate.

[0016] A method for using a sorting fishing gear for fishery resources investigation, the method comprising:

[0017] S1: During the process of the driving plate moving on the threaded rod, the driving wheel will contact the control plate. When the driving plate contacts the supporting connecting block on the control plate, the driving wheel will be pushed by the vertical surface of the moving block provided on the supporting connecting block to rotate. The driving wheel drives the connecting rod to rotate, the connecting rod drives the connecting side plate to rotate, the connecting side plate drives the top gear to rotate, the top gear drives the gear rod fixedly connected to the bottom to rotate, and the gear rod drives the rack to move towards the center of the gear rod, contracting the connecting box body and the adjusting block towards the inside of the device shell. As the sorting device gradually moves towards the fish school, the fish swim out from the gaps between the sorting device and the connecting side plate and between the sorting device and the central connecting plate;

[0018] S2: When the driving plate moves back, that is, when the driving motor rotates in reverse, the sorting device gradually moves towards the storage box, driving the fish that swim into the gap between the sorting device and the storage box to enter the storage box from the connecting groove. During this process, the water flow inside the connecting box body pushes the adjusting block outwards, so that the adjusting block contacts the central connecting plate or the connecting side plate on the side, blocking the fish from swimming back through the gaps between the sorting device and the connecting side plate and between the sorting device and the central connecting plate;

[0019] S3: When the sorting device moves close to the connection slot, the sorting device, the connection side plate, and the central connection plate push the water and fish to move towards the inside of the storage tank. By pushing the water into the inside of the storage tank, the limiting block is pushed to rotate. The movable block on the limiting block cooperates with the limiting block at the bottom of the box body shell, so that the baffle can only rotate in one direction, and the qualified fish are sorted into the same compartment in the box body shell, and then the next sorting is carried out.

[0020] Beneficial effects:

[0021] 1. For the sorting fishing gear for fishery resources investigation and its using method, the motor drives the sorting device to move back and forth inside the sorting fishing gear. The control board adjusts the gap between the connection box body and the side structure during the reciprocating motion, so that the gaps between the connection box body and the connection side plate, and between the connection box body and the central connection plate gradually expand. The fish schools are classified by body size through the gaps between the sorting device, the connection side plate, and the central connection plate, and the sorted fish are driven into the inside of the storage tank. The sorting speed is fast and the efficiency is high. Description of the drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of a sorting fishing gear for fishery resources investigation and its using method proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the internal structure of the sorting device of a sorting fishing gear for fishery resources investigation and its using method proposed by the present invention;

[0024] Figure 3 It is a schematic diagram of the control board structure of a sorting fishing gear for fishery resources investigation and its using method proposed by the present invention;

[0025] Figure 4 It is a schematic diagram of the storage tank structure of a sorting fishing gear for fishery resources investigation and its using method proposed by the present invention.

[0026] Among them: 1. Sorting fishing gear; 2. Storage tank; 201. Box body shell; 202. Limiting block; 203. Baffle; 204. Connection seat; 205. Spring damper; 206. Movable block; 3. Driving motor; 4. Control board; 401. Support rod; 402. Rotating shaft; 403. Support connection block; 404. Spring damping device; 405. Moving block; 5. Sorting device; 501. Device shell; 502. Top gear; 503. Connection box body; 504. Gear rod; 505. Rack; 506. Water tank; 507. Adjusting block; 6. Driving plate; 7. Threaded rod; 8. Driving wheel; 9. Connecting rod; 10. Connection side plate; 11. Central connection plate; 12. Connection slot. Specific implementation manners

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0028] Embodiment 1

[0029] Please refer to Figure 1 - Figure 2 , a sorting fishing gear for fishery resource investigation, including a sorting fishing gear 1 and a storage box 2. A driving motor 3 is fixedly connected to the top of the sorting fishing gear 1. A threaded rod 7 is fixedly connected to the side of the driving motor 3. The other side of the threaded rod 7 is rotatably connected to the sorting fishing gear 1. A driving plate 6 is threadedly connected to the threaded rod 7. Connecting side plates 10, a sorting device 5 and a central connecting plate 11 are fixedly connected to the inner side of the driving plate 6;

[0030] The sorting device 5 includes a device housing 501. A top gear 502 is rotatably connected to the top of the device housing 501. The top gear 502 is meshed and connected to the connecting side plate 10 on the side. A connecting rod 9 is rotatably connected to the top of the central connecting plate 11. The connecting side plate 10 is arranged on the connecting rod 9 and fixedly connected to the connecting rod 9. A gear rod 504 is fixedly connected to the bottom of the top gear 502. A rack 505 is meshed and connected to the side of the gear rod 504. A connecting box body 503 is fixedly connected to the side of the rack 505. A driving wheel 8 is fixedly connected to the side of the connecting rod 9. A control board 4 is movably connected to the bottom of the driving wheel 8;

[0031] When in use, the driving motor 3 rotates forward to drive the threaded rod 7 to rotate. The threaded rod 7 drives the driving plate 6 threadedly connected thereto to perform horizontal movement inside the sorting fishing gear 1. A fish school is placed on the side of the sorting fishing gear 1 away from the storage box 2. The driving plate 6 drives the connecting side plates 10, the sorting device 5 and the central connecting plate 11 fixedly connected to the inner side to move towards the fish school. The fish that meet the conditions will swim through the gaps at both ends of the sorting device 5 to one end of the sorting fishing gear 1 close to the storage box 2. Subsequently, the driving motor 3 rotates in reverse, driving the sorting device 5, the connecting side plates 10 and the central connecting plate 11 to move in the reverse direction, driving the sorted fish into the storage box 2.

[0032] Embodiment 2

[0033] Please refer to Figure 1 - Figure 4, the connecting box body 503 is of a hollow structure. An adjusting block 507 is sleeved inside the connecting box body 503. A number of water troughs 506 are provided on the connecting box body 503. One end of the adjusting block 507 facing outward is of a fan-shaped structure, and the fan surface faces the direction of the storage box 2. One end of the adjusting block 507 facing inward is of a cuboid structure, and its inner wall is movably connected to the connecting box body 503. Water troughs 506 are also provided on the fan surface of the adjusting block 507. The inclined surface of the adjusting block 507 is a closed structure.

[0034] The sorting fishing gear 1 and the storage box 2 are fixedly connected. A connecting groove 12 is provided between the sorting fishing gear 1 and the storage box 2, and the opening position of the connecting groove 12 deviates from the center of the sorting fishing gear 1 and the storage box 2.

[0035] Link rods are fixedly connected in the middle of the sorting device 5, the connecting side plate 10 and the central connecting plate 11, and they are fixedly connected together through the link rods. The connecting side plate 10 is movably connected to the sorting fishing gear 1.

[0036] The control board 4 includes a support rod 401. A rotating shaft 402 is rotatably connected to the side surface of the support rod 401. A support connecting block 403 is rotatably connected to the side surface of the rotating shaft 402. A spring damping device 404 is fixedly connected inside the support connecting block 403. A moving block 405 is fixedly connected to the top of the spring damping device 404, and the moving block 405 is movably connected to the support connecting block 403.

[0037] A control device is arranged inside the support rod 401, which can control the rotation of the support connecting block 403. By controlling the number of the support connecting blocks 403 facing vertically upward on the support rod, the rotation angle of the driving wheel 8 after each contact is controlled, and thus the opening size of the connecting box body 403 during each sorting is controlled.

[0038] The storage box 2 includes a box body shell 201. A connecting seat 204 is fixedly connected to the center of the bottom of the box body shell 201. A baffle 203 is rotatably connected to the connecting seat 204. A limiting block 202 is fixedly connected to the inner wall of the bottom of the box body shell 201. A spring damper 205 is fixedly connected to the outer side surface of the bottom of the baffle 203. A movable block 206 is fixedly connected to the side surface of the spring damper 205, and the movable block 206 is movably connected to the limiting block 202, enabling the baffle 203 to rotate in one direction.

[0039] During use, the driving motor 3 drives the driving plate 6 to move towards the fish school. At this time, the water at the position of the sorting device 5 will accumulate at the device housing 501 as the sorting device 5 moves. Part of the water flows out towards the storage tank 2 through the water trough 506 on the connecting box body 503 and the adjusting block 507. The water trough 506 opened on the adjusting block 507 makes the water flow rate at the connecting box body 503 in the direction of the storage tank 2 larger. The water flow rate inside the connecting box body 503 is greater than the water flow rate on the outer side surface of the adjusting block 507. According to Bernoulli's principle, the pressure on the outer side surface of the adjusting block 507 is greater than the pressure inside the connecting box body 503, and the water flow will flow from the side surface of the adjusting block 507 into the inside of the connecting box body 503, making the adjusting block 507 in a contracted state when moving towards the fish school. When the sorting device 5 moves in the reverse direction, the pressure on the outer side surface of the adjusting block 507 is less than the pressure inside the connecting box body 503, and the water flow that has moved into the inside of the connecting box body 503 pushes the adjusting block 507 outwards, making the adjusting block 507 contact the central connecting plate 11 or the connecting side plate 10 on the side, blocking the fish from swimming back through the gaps between the sorting device 5 and the connecting side plate 10, and between the sorting device 5 and the central connecting plate 11.

[0040] A method for using a sorting fishing gear for fishery resources investigation, the method comprising:

[0041] S1: During the process of the driving plate 6 moving on the threaded rod 7, the driving wheel 8 will come into contact with the control board 4. When the driving plate 6 contacts the support connecting block 403 on the control board 4, the driving wheel 8 will be pushed by the vertical surface of the moving block 405 provided on the support connecting block 403 to rotate. The driving wheel 8 drives the connecting rod 9 to rotate, the connecting rod 9 drives the connecting side plate 10 to rotate, the connecting side plate 10 drives the top gear 502 to rotate, the top gear 502 drives the gear rod 504 fixedly connected at the bottom to rotate, and the gear rod 504 drives the rack 505 to move towards the center of the gear rod 504, contracting the connecting box body 503 and the adjusting block 507 towards the inside of the device housing 501. As the sorting device 5 gradually moves towards the fish school, the fish swim out through the gaps between the sorting device 5 and the connecting side plate 10, and between the sorting device 5 and the central connecting plate 11;

[0042] S2: When the driving plate 6 moves back, that is, when the driving motor 3 rotates in reverse, the sorting device 5 gradually moves towards the storage tank 2, driving the fish that swim into the space between the sorting device 5 and the storage tank 2 to enter the storage tank 2 through the connecting groove 12. During this process, the water flow inside the connecting box body 503 pushes the adjusting block 507 outwards, making the adjusting block 507 contact the central connecting plate 11 or the connecting side plate 10 on the side, blocking the fish from swimming back through the gaps between the sorting device 5 and the connecting side plate 10, and between the sorting device 5 and the central connecting plate 11.

[0043] S3: When the sorting device 5 moves close to the connecting groove 12, the sorting device 5, the connecting side plate 10, and the central connecting plate 11 push the water and fish to move inside the storage tank 2. By pushing the water into the storage tank 2, the limiting block 202 is pushed to rotate. The movable block 206 on the limiting block 202 cooperates with the limiting block 202 at the bottom of the box body shell 201, so that the baffle plate 203 can only rotate in one direction, sorting the qualified fish into the same compartment in the box body shell 201, and then performing the next sorting.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sorting fishing gear for fishery resources investigation, comprising a sorting fishing gear (1) and a storage box (2), characterized in that: A drive motor (3) is fixedly connected to the top of the sorting fishing gear (1). A threaded rod (7) is fixedly connected to the side of the drive motor (3). The other side of the threaded rod (7) is rotatably connected to the sorting fishing gear (1). A drive plate (6) is threadedly connected to the threaded rod (7). A connecting side plate (10), a sorting device (5) and a central connecting plate (11) are fixedly connected to the inner side of the drive plate (6). The sorting device (5) includes a device housing (501). A top gear (502) is rotatably connected to the top of the device housing (501). A connecting side plate (10) is meshingly connected to the side of the top gear (502). A connecting rod (9) is rotatably connected to the top of the central connecting plate (11). The connecting side plate (10) is arranged on the connecting rod (9) and fixedly connected to the connecting rod (9). A gear rod (504) is fixedly connected to the bottom of the top gear (502). A rack (505) is meshingly connected to the side of the gear rod (504). A connecting box body (503) is fixedly connected to the side of the rack (505). A drive wheel (8) is fixedly connected to the side of the connecting rod (9). A control board (4) is movably connected to the bottom of the drive wheel (8). During use, the forward rotation of the drive motor (3) drives the threaded rod (7) to rotate. The threaded rod (7) drives the drive plate (6) threadedly connected thereto to perform horizontal movement inside the sorting fishing gear (1). A fish school is placed on the side of the sorting fishing gear (1) away from the storage box (2). The drive plate (6) drives the connecting side plate (10), the sorting device (5) and the central connecting plate (11) fixedly connected to its inner side to move towards the fish school. Eligible fish will swim through the gaps at both ends of the sorting device (5) to the end of the sorting fishing gear (1) close to the storage box (2). Subsequently, the drive motor (3) rotates in reverse, driving the sorting device (5), the connecting side plate (10) and the central connecting plate (11) to move in the reverse direction, driving the sorted fish into the storage box (2).

2. The sorting fishing gear for fishery resources survey according to claim 1, characterized in that: The connecting box body (503) is of a hollow structure. An adjusting block (507) is sleeved inside the connecting box body (503). A number of water troughs (506) are opened on the connecting box body (503). The outer end of the adjusting block (507) is of a fan-shaped structure, and the fan surface faces the direction of the storage box (2). The inner end of the adjusting block (507) is of a cuboid structure, and the inner wall is movably connected to the connecting box body (503). Water troughs (506) are also opened on the fan surface of the adjusting block (507). The inclined surface of the adjusting block (507) is of a closed structure.

3. The sorting fishing gear for fishery resources investigation according to claim 2, wherein: The sorting fishing gear (1) and the storage box (2) are fixedly connected. A connecting groove (12) is opened between the sorting fishing gear (1) and the storage box (2). The opening position of the connecting groove (12) deviates from the centers of the sorting fishing gear (1) and the storage box (2).

4. A sorting fishing gear for fishery resources investigation according to claim 3, characterized in that: A connecting rod is fixedly connected in the middle of the classification device (5), the connecting side plate (10) and the central connecting plate (11), and they are fixedly connected together through the connecting rod. The connecting side plate (10) is movably connected to the sorting fishing gear (1).

5. A sorting fishing gear for fishery resources investigation according to claim 4, characterized in that: The control board (4) includes a support rod (401). A rotating shaft (402) is rotatably connected to the side surface of the support rod (401). A support connecting block (403) is rotatably connected to the side surface of the rotating shaft (402). A spring damper device (404) is fixedly connected inside the support connecting block (403). A moving block (405) is fixedly connected to the top of the spring damper device (404). The moving block (405) is movably connected to the support connecting block (403).

6. The sorting fishing gear for fishery resources survey according to claim 5, characterized in that: A control device is arranged inside the support rod (401) and can control the support connecting block (403) to rotate.

7. A sorting fishing gear for fishery resources investigation according to claim 6, characterized in that: The storage box (2) includes a box body shell (201). A connecting seat (204) is fixedly connected to the center of the bottom of the box body shell (201). A baffle (203) is rotatably connected to the connecting seat (204). A limiting block (202) is fixedly connected to the inner wall of the bottom of the box body shell (201). A spring damper (205) is fixedly connected to the outer side surface of the bottom of the baffle (203). A movable block (206) is fixedly connected to the side surface of the spring damper (205). The movable block (206) is movably connected to the limiting block (202), so that the baffle (203) rotates in one direction.

8. A method for using a sorting fishing gear for fishery resources survey, the sorting fishing gear for fishery resources survey according to claim 7, characterized in that, The method includes: S1: During the movement of the driving plate (6) on the threaded rod (7), the driving wheel (8) will come into contact with the control board (4). When the driving plate (6) comes into contact with the support connecting block (403) on the control board (4), the driving wheel (8) will be pushed by the vertical surface of the moving block (405) arranged on the support connecting block (403) to rotate. The driving wheel (8) drives the connecting rod (9) to rotate. The connecting rod (9) drives the connecting side plate (10) to rotate. The connecting side plate (10) drives the top gear (502) to rotate. The top gear (502) drives the gear rod (504) fixedly connected to the bottom to rotate. The gear rod (504) drives the rack (505) to move towards the center of the gear rod (504), contracting the connecting box body (503) and the adjusting block (507) into the interior of the device housing (501). As the classification device (5) gradually moves towards the fish school, the fish swim out from the gaps between the classification device (5) and the connecting side plate (10), and between the classification device (5) and the central connecting plate (11); S2: When the sorting device (5) moves close to the connecting groove (12), the sorting device (5), the connecting side plate (10) and the central connecting plate (11) push the water and fish to move inside the storage tank (2). By pushing the water into the storage tank (2), the limiting block (202) is driven to rotate. The movable block (206) on the limiting block (202) cooperates with the limiting block (202) at the bottom of the box body shell (201), so that the baffle (203) can only rotate in one direction, sorting the qualified fish into the same compartment in the box body shell (201), and then performing the next sorting; S3: When the driving plate (6) moves back, that is, when the driving motor (3) reverses, the sorting device (5) gradually moves towards the storage tank (2), driving the fish swimming between the sorting device (5) and the storage tank (2) to enter the storage tank (2) from the connecting groove (12). During this process, the water flow inside the connecting box body (503) pushes the adjusting block (507) outwards, so that the adjusting block (507) contacts the central connecting plate (11) or the connecting side plate (10) on the side, blocking the fish from swimming back through the gaps between the sorting device (5) and the connecting side plate (10), and between the sorting device (5) and the central connecting plate (11).

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