Fish fry grading conveying equipment based on fish swimming capacity and working method thereof

Abstract

The invention relates to a fish swimming ability-based fry grading conveying device and a working method thereof, the fish swimming ability-based fry grading conveying device comprises an inclined fish swimming grading bin, the highest end of the inclined fish swimming grading bin is filled with water flow, and the inner cavity of the inclined fish swimming grading bin is sequentially divided into a big fish swimming area, a fish inlet area and a small fish swimming area along the water flow direction; each fish transferring device is provided with an air cannon body, and the two fish transferring devices are used for transferring the big fish swimming area and the small fish swimming area of the fish swimming classification bin into the corresponding air cannon bodies respectively; wherein a fish fry conveying supporting body is arranged in the air cannon body, one end of the air cannon body is arranged to be a fish outlet end communicated with the conveying pipeline, the other end of the air cannon body is communicated with a compressed air source, and the fish fry conveying supporting body containing fish bodies is pushed out of the fish outlet end of the air cannon body through airflow when the fish bodies are conveyed. The relation curve of fish specifications and swimming capacity is combined with the fish transferring device to realize lossless grading of fish specifications, and the fry conveying support body is matched with compressed air to realize long-distance conveying of fries.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture, in particular to a fry grading and conveying device based on the swimming ability of fish and a working method thereof. Background Art

[0002] With the continuous expansion of the domestic fish seedling industry, there are many problems with traditional methods of grading and transporting fry, such as large fry loss, low grading efficiency, and inability to achieve long-distance lossless transportation. Existing grading devices usually use mechanical screening or manual operation, which can easily cause physical damage to the fry and are difficult to adapt to the grading needs of fry of different specifications. Therefore, there is an urgent need for a device that can perform lossless grading according to the swimming ability of fish and achieve efficient transportation to improve the survival rate of fry and breeding efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a fry grading and conveying device based on the swimming ability of fish and a working method thereof, so as to solve the defects existing in the prior art.

[0004] The object of the present invention is achieved in this way: a fry classification and conveying device based on the swimming ability of fishes, comprising:

[0005] The fish swimming classification chamber is arranged obliquely, and water flows into the highest end thereof when in use, and the inner cavity thereof is divided into a large fish swimming area, a fish entry area, and a small fish swimming area in sequence along the direction of the water flow;

[0006] Two fish transfer devices, each of which is equipped with an air cannon body, and the two fish transfer devices are used to transfer the large fish swimming area and the small fish swimming area of ​​the fish swimming classification bin to the corresponding air cannon body;

[0007] Among them, the air cannon body is equipped with a movable fish fry conveying tray for receiving and accommodating fish bodies. One end of the air cannon body is set as a fish outlet end connected to the conveying pipeline, and the other end is connected to a compressed air source. When conveying fish bodies, the airflow is used to push the fish fry conveying tray containing fish bodies out of the fish outlet end of the air cannon body.

[0008] Furthermore, the air cannon body is arranged obliquely, with its fish outlet end being at the lower part and its air intake end being at the upper part.

[0009] Furthermore, the fry conveying support body is composed of two limiting rubber plates and a connecting rod, the connecting rod fixedly connects the two limiting rubber plates, the limiting rubber plates are set as circular plates, and the air cannon body is set as a cylinder; when receiving the fish body, the fry conveying support body is temporarily positioned by relying on the contact between the edge of the limiting rubber plate and the inner wall of the air cannon body, and the fish rotating device is facing the area between the two limiting rubber plates.

[0010] Furthermore, an air cannon cover is detachably mounted on the air inlet end of the air cannon body, and the air cannon cover is provided with a compressed air inlet for connecting to a compressed air source.

[0011] Furthermore, the fish rotating device comprises:

[0012] The fish turner is configured as a hollow seat, the water-facing side of which is configured as a water-passing side, and the water-receiving side of which is configured as an opening for releasing the fish;

[0013] A transport shell seat, which is fixedly connected to and communicated with the side wall of the air cannon body and has an inlet for receiving the fish body;

[0014] A power unit, which is drivingly connected to the fish spinner;

[0015] Wherein, driven by the power unit, the fish turner has two switchable working positions:

[0016] One of the working positions of the fish rotating device is in the large fish swimming area / small fish swimming area of ​​the fish swimming classification bin, for receiving large fish / small fish;

[0017] Another working position of the fish transfer device is outside the fish swimming classification chamber, and the backwater side opening of the fish transfer device is directly opposite to the entrance of the transfer shell seat, which is used for transferring fish bodies into the air cannon body.

[0018] Furthermore, two movable openings are provided on one side wall of the fish swimming classification bin, and the two movable openings are respectively movably matched with two fish rotating devices. The fish rotating device includes a cylinder, the cylinder barrel of the cylinder is fixedly arranged, and its movable part is fixedly connected to the fish rotating device.

[0019] Furthermore, two rectifier tubes are built into the fish swimming classification chamber, and mesh plates are provided on the water-facing side and the water-receiving side of the rectifier tube. The two rectifier tubes are respectively located upstream of the big fish swimming area and downstream of the small fish swimming area.

[0020] Furthermore, an openable and closable fish inlet funnel is connected to the upper part of the fish inlet area of ​​the fish swimming and grading bin.

[0021] Furthermore, the device also includes:

[0022] A water storage tank contains water, and the lowest end of the fish swimming classification chamber faces downwardly to the interior of the water storage tank;

[0023] A water inlet pipe, one end of which is connected to the water storage tank, and the other end of which is connected to the highest end of the fish swimming classification chamber;

[0024] A large-flow submersible pump based on frequency conversion control is installed in a water storage tank and connected to a water inlet pipe.

[0025] As another aspect of the present invention, a working method is proposed based on the above device, which comprises at least the following steps:

[0026] Preparation steps: Place the empty fry conveyor into the air cannon;

[0027] Classification steps: introducing water flow into the fish swimming classification chamber, inputting a number of fish bodies into the fish inlet area of ​​the fish swimming classification chamber, regulating the water flow, rectifying by using a rectifier tube, and classifying the fish according to a curve of relationship between fish size and swimming ability. Large-sized fish bodies with stronger swimming ability will gather at the lower end surface of the upper rectifier tube, and small-sized fish bodies will be restricted by the impact of water flow at the upper end surface of the lower rectifier tube, so that the large-sized fish bodies can be placed in the upper fish rotating device, and the small-sized fish bodies can be placed in the lower fish rotating device;

[0028] Transfer steps: driven by their respective power units, the upper fish transfer device transfers the large-sized fish into the corresponding air cannon body, and the lower fish transfer device transfers the small-sized fish into the corresponding air cannon body;

[0029] Conveying steps: After the fry enters the air cannon body, the fry conveying tray is pushed into the conveying pipeline by compressed air, and the fry conveying tray and the graded fry are sent to the corresponding fish pond together.

[0030] The beneficial effects of the present invention are:

[0031] Solve the problem that traditional fish fry grading devices have large losses and cannot be transported over long distances without loss. The device controls the water flow through a large-flow submersible pump and a rectifier tube, and uses the relationship curve between fish size and swimming ability to perform grading. Large-sized fish fry gather at the top due to their strong swimming ability, while small-sized fish fry are confined at the bottom. The device is also equipped with a fish turner and an air cannon system to achieve lossless transfer and long-distance transportation of fish fry. The present invention significantly improves the efficiency of fish fry grading and transportation, reduces fish fry damage, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a perspective view of the present invention.

[0033] Figure 2 It is a schematic diagram of the relationship between the fish spinner and the air cannon body.

[0034] Figure 3 It is another stereogram of the present invention.

[0035] Figure 4 This is a schematic diagram of the principle of using an air cannon to transport fish.

[0036] Description of reference numerals:

[0037] Water storage tank 1, fish outlet 2, large-flow submersible pump 3, frame 4, water inlet pipe 5, fry conveying support 6, limiting rubber plate 6a, connecting rod 6b, fish swimming classification chamber 7, rectifier tube 8, filling funnel cover 9, fish inlet funnel 10, camera 11, air cannon cover 12, compressed air inlet 13, air cannon sealing buckle 14, air cannon body 15, fish turner 16, cylinder 17, and transfer shell seat 18. DETAILED DESCRIPTION

[0038] The following will be combined with the attached embodiment of the present invention Figure 1-4 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the 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.

[0039] like Figure 1-4 As shown, a fry grading and conveying device based on the swimming ability of fish is proposed, comprising:

[0040] The fish swimming classification chamber 7 is arranged obliquely, and water flows into the highest end thereof when in use, and its inner cavity is divided into a large fish swimming area, a fish entry area, and a small fish swimming area in sequence along the water flow direction. A rectifying area is also provided. In order to facilitate observation of the swimming status of large fish and small fish, the large fish swimming area and the small fish swimming area can be made of transparent materials so as to observe the swimming status of the fish from the outside;

[0041] Two fish transfer devices, each of which is equipped with a fixed air cannon body 15, that is, two air cannon bodies 15 are provided, and the two fish transfer devices are used to transfer the large fish swimming area and the small fish swimming area of ​​the fish swimming classification bin 7 to the corresponding air cannon body 15 respectively;

[0042] A water storage tank 1 contains water, and the lowest end of the fish swimming classification chamber 7 faces downwardly to the interior of the water storage tank 1. Two pipes are fixed to one side wall of the water storage tank 1 as fish outlets 2. The two fish outlets 2 are connected to the lower ends of two air cannon bodies 15 through hoses, so as to transport the classified fish bodies to a special fish pond;

[0043] A water inlet pipe 5, one end of which is connected to the water storage tank 1, and the other end of which is connected to the highest end of the fish swimming classification chamber 7;

[0044] A high-flow submersible pump 3 based on frequency conversion control is installed in the water storage tank 1 and connected to the water inlet pipe 5;

[0045] The frame 4 is fixed in the water storage tank 1 , and the fish swimming classification chamber 7 is fixedly installed on the frame 4 .

[0046] Among them, the air cannon body 15 is equipped with a movable fry conveying tray 6 for receiving and accommodating fish bodies. One end of the air cannon body 15 is set as a fish outlet end connected to the conveying pipeline, and the other end is connected to a compressed air source. When conveying fish bodies, the airflow is used to push the fry conveying tray 6 containing fish bodies out of the fish outlet end of the air cannon body 15.

[0047] The air cannon body 15 is arranged obliquely, with its fish outlet end at the lower part and its air intake end at the upper part.

[0048] The above-mentioned fry conveying support body 6 is composed of two limiting rubber plates 6a and a connecting rod 6b, the connecting rod 6b is fixedly connected to the two limiting rubber plates 6a, the limiting rubber plates 6a are set as round plates, and the air cannon body 15 is set as a cylinder; when receiving the fish body, the fry conveying support body 6 is temporarily positioned by relying on the contact between the edges of the two limiting rubber plates 6a and the inner wall of the air cannon body 15, and has a sealing effect to protect the fish body, and the fish transfer device is directly facing the area between the two limiting rubber plates 6a; Figure 4 As shown, when transporting the classified fish bodies, the compressed gas impacts the limiting rubber plate 6a of the fry conveying tray 6, overcoming the friction between the edge of the limiting rubber plate 6a and the inner wall of the air cannon body 15, thereby pushing the fry conveying tray 6 out of the air cannon body 15, and delivering the fry conveying tray 6 and the fish bodies thereof to the fish pond through the conveying pipeline (through the fish outlet 2).

[0049] The air cannon cover 12 is detachably mounted on the air inlet end of the air cannon body 15, and a compressed air inlet 13 for connecting to a compressed air source is provided on the air cannon cover 12; there are many ways to detachably mount the air cannon cover 12, such as using an air cannon sealing buckle 14 to lock the air cannon cover 12 at the upper air inlet end of the air cannon body 15 (when the air cannon cover 12 is removed, the air cannon sealing buckle 14 can be unlocked to unlock the air cannon cover 12), so that the air cannon cover 12 covers the upper air inlet end of the air cannon body 15, so that high-pressure gas can only enter the air cannon body 15 through the compressed air inlet 13 of the air cannon cover 12.

[0050] The above-mentioned fish rotating device comprises:

[0051] The fish turner 16 is configured as a hollow seat, the water-facing side of which is configured as a water-passing side, and the water-receiving side of which is configured as an opening for releasing fish;

[0052] A transport housing seat 18, which is fixedly connected to and communicates with the side wall of the air cannon body 15, and has an inlet for receiving the fish body;

[0053] The power unit is in transmission connection with the fish spinner 16 .

[0054] Wherein, driven by the power unit, the fish turner 16 has two switchable working positions:

[0055] One of the working positions of the fish rotating device 16 is in the large fish swimming area / small fish swimming area of ​​the fish swimming classification bin 7, for receiving large fish / small fish;

[0056] like Figure 2 As shown, another working position of the fish transfer device 16 is outside the fish swimming grading bin 7, and the dorsal opening of the fish transfer device 16 is opposite to the entrance of the transfer shell seat 18, and also opposite to the area between the two limiting rubber plates 6a of the fry conveying tray 6. When the fish body is transferred into the air cannon body 15, the fish body can directly enter between the two limiting rubber plates 6a of the fry conveying tray 6.

[0057] In order to facilitate the movement of the fish rotator 16 in and out of the fish swimming and grading chamber 7, two movable openings are opened on one side wall of the fish swimming and grading chamber 7, and the two movable openings are respectively coordinated with the horizontal movement of the two fish rotators 16. The fish rotating device includes a cylinder 17, and the cylinder barrel of the cylinder 17 is fixedly arranged (fixed on the frame 4), and its movable part is fixedly connected to the fish rotator 16. The cylinder 17 can be set as a rodless cylinder. A magnet is fixed on the inner wall of the fish rotator 16, and the fish rotator 16 is fixed on the slider of the cylinder 17 by magnetic adsorption.

[0058] In addition, cameras 11 are installed in the large fish swimming area and the small fish swimming area of ​​the fish swimming classification chamber 7 to monitor whether the fry group has completely entered the fish rotating device 16.

[0059] In order to rectify the flowing water in the fish swimming grading chamber 7, effectively control the flow stability of the fish swimming area and prevent the fry from leaving the swimming area, the above-mentioned fish swimming grading chamber 7 is equipped with two rectifier tubes 8 (corresponding to the rectifier area), and mesh plates are provided on the water-facing side and the water-receiving side of the rectifier tube 8. The two rectifier tubes 8 are respectively located upstream of the big fish swimming area and downstream of the small fish swimming area.

[0060] The water storage tank 1 is used to support the water demand required for the circulation of the fish swimming classification chamber 7. The submersible pump 3 pumps water from the water storage tank 1 into the fish swimming classification chamber 7 and returns to the water storage tank through two rectifier tubes 8. The rectifier tube 8 is used to even out the inflow and outflow of water, effectively control the flow stability of the fish swimming area and prevent the fry from leaving the swimming area. The high-flow submersible pump 3 adjusts the flow rate by the frequency converter, and classifies the fish according to the relationship curve between the fish size and the swimming ability. Large-sized fish with strong swimming ability will gather at the lower end face of the upper rectifier tube, while small-sized fish cannot withstand the water flow and are restricted to the upper end face of the lower rectifier tube.

[0061] The upper part of the fish entry area of ​​the above-mentioned fish swimming grading bin 7 is connected to a closable fish entry funnel 10, and an openable and closable filling funnel cover 9 is installed at the upper port of the fish entry funnel 10. The filling funnel cover 9 is used to cover the fish entry funnel 10. When the fry are poured into the fish entry funnel 10, the filling funnel cover 9 is immediately covered to fill the space in the funnel.

[0062] Based on the above device, a working method is proposed, comprising the following steps:

[0063] Preparation steps: loading the empty fry conveying tray 6 into the air cannon body 15, locking the air cannon cover 12 on the upper port of the air cannon body 15 by using the air cannon sealing buckle 14, so that the air cannon cover 12 covers the upper port of the air cannon body 15, driving the two fish turners 16 to be in the fish swimming classification chamber 7;

[0064] Classification steps: introducing water flow into the fish swimming classification chamber 7, inputting a number of fish bodies into the fish inlet area of ​​the fish swimming classification chamber 7, regulating the water flow, rectifying by using the rectifier tube 8, and classifying the fish according to the relationship curve between the fish size and the swimming ability. The large-sized fish bodies with stronger swimming ability will gather on the lower end surface of the upper rectifier tube 8, and the small-sized fish bodies will be restricted on the upper end surface of the lower rectifier tube 8 by the impact of the water flow, so that the large-sized fish bodies can be placed in the upper fish rotating device 16, and the small-sized fish bodies can be placed in the lower fish rotating device 16;

[0065] Transfer step: under the drive of each power unit (cylinder 17), the fish transfer device 16 carries the fish of corresponding specifications and moves out of the fish swimming classification chamber 7, so that the backwater side opening of the fish transfer device 16 is directly opposite to the entrance of the transfer shell seat 18, and the backwater side opening of the fish transfer device 16 is obliquely downwardly aligned with the entrance of the transfer shell seat 18, and is also directly opposite to the area between the two limiting rubber plates 6a of the fry conveying tray 6, and the fish body is driven by its own weight to fall directly between the two limiting rubber plates 6a of the fry conveying tray 6;

[0066] The upper fish transfer device 16 transfers the large-sized fish body to the corresponding air cannon body 15, and the lower fish transfer device 16 transfers the small-sized fish body to the corresponding air cannon body 15;

[0067] Conveying step: using compressed air to push the fry conveying tray 6 into the conveying pipeline, the fry conveying tray 6 and the graded fry are sent to the corresponding fish ponds, that is, the big fish and the small fish are sent to two different ponds respectively.

[0068] More specifically, compressed air enters the air cannon body 15 through the compressed air inlet 13, and the compressed gas is used to impact the limiting rubber plate 6a of the fry conveying tray 6, thereby overcoming the friction between the edge of the limiting rubber plate 6a and the inner wall of the air cannon body 15, thereby pushing the fry conveying tray 6 out of the air cannon body 15, and delivering the fry conveying tray 6 and the fish bodies thereof to the fish pond through the conveying pipe (through the fish outlet 2).

[0069] like Figure 3As shown, when the fry are transported, the fish turner 16 needs to be reset, that is, the fish turner 16 needs to be moved into the fish swimming classification chamber 7; the user needs to open the air cannon sealing buckle 14 to install the fry transporting tray 6 inside and then close the air cannon cover 12 so that subsequent compressed air can enter from the compressed air inlet 13.

[0070] In the breeding process, putting big fish and small fish together will cause the big fish to snatch food from the small fish. Individual differences cannot be avoided in the breeding process, so they should be separated regularly and the big fish and small fish should be transported to the corresponding fish ponds respectively. It is worth mentioning that the big fish and small fish mentioned in the present invention are simplified nouns, specifically, fish that meet the specifications of the next stage and fish that do not meet the specifications.

[0071] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention; in the present invention, it should also be noted that the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integrally formed connection, a mechanical connection, or an indirect connection through an intermediate connecting component, and the specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0072] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0073] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fry grading and conveying device based on the swimming ability of fish, characterized in that: include: The fish swimming classification chamber (7) is arranged obliquely, and water flows into the highest end thereof when in use, and the inner cavity thereof is divided into a large fish swimming area, a fish entry area, and a small fish swimming area in sequence along the direction of the water flow; Two fish transfer devices, each of which is equipped with an air cannon body (15), and the two fish transfer devices are used to transfer the large fish swimming area and the small fish swimming area of ​​the fish swimming classification bin (7) to the corresponding air cannon body (15); The air cannon body (15) is internally provided with a movable fry conveying support body (6) for receiving and accommodating fish bodies. One end of the air cannon body (15) is provided as a fish outlet end connected to a conveying pipeline, and the other end is connected to a compressed air source. When conveying fish bodies, the fry conveying support body (6) containing the fish bodies is pushed out of the fish outlet end of the air cannon body (15) by utilizing airflow.

2. The fish fry grading and conveying device based on the swimming ability of fish according to claim 1 is characterized in that: The air cannon body (15) is arranged obliquely, with its fish outlet end at the lower part and its air intake end at the upper part.

3. The fish fry classification and transportation device based on the fish swimming ability according to claim 2 is characterized in that: The fry conveying support (6) is composed of two limiting rubber plates (6a) and a connecting rod (6b), wherein the connecting rod (6b) is fixedly connected to the two limiting rubber plates (6a), the limiting rubber plates (6a) are configured as circular plates, and the air cannon body (15) is configured as a cylinder; when receiving a fish body, the fry conveying support (6) is temporarily positioned by virtue of the contact between the edge of the limiting rubber plate (6a) and the inner wall of the air cannon body (15), and the fish rotating device is directly opposite to the area between the two limiting rubber plates (6a).

4. The fish fry grading and conveying device based on the swimming ability of fish according to claim 2, characterized in that: An air cannon cover (12) is detachably mounted on the air inlet end of the air cannon body (15), and a compressed air inlet (13) for connecting to a compressed air source is provided on the air cannon cover (12).

5. The fish fry classification and transportation device based on the fish swimming ability according to claim 3 is characterized in that: The fish rotating device comprises: The fish turner (16) is configured as a hollow seat, the water-facing side of which is configured as a water-passing side, and the water-receiving side of which is configured as an opening for releasing the fish; A transport shell seat (18) is fixedly connected to and communicated with the side wall of the air cannon body (15), and has an inlet for receiving a fish body; A power unit, which is in driving connection with the fish rotating device (16); Wherein, driven by the power unit, the fish turner (16) has two switchable working positions: One of the working positions of the fish rotating device (16) is located in the large fish swimming area / small fish swimming area of ​​the fish swimming classification bin (7) for receiving large fish / small fish; Another working position of the fish transfer device (16) is outside the fish swimming classification chamber (7), and the backwater side opening of the fish transfer device (16) is directly opposite to the inlet of the transfer shell seat (18), so as to transfer the fish body into the air cannon body (15).

6. The fish fry classification and transportation device based on the fish swimming ability according to claim 5 is characterized in that: A side wall of the fish swimming classification bin (7) is provided with two movable openings, which are respectively movably matched with two fish rotating devices (16). The fish rotating device comprises a cylinder (17), the cylinder barrel of the cylinder (17) is fixedly arranged, and the movable part thereof is fixedly connected to the fish rotating device (16).

7. The fish fry classification and transportation device based on the fish swimming ability according to claim 6 is characterized in that: The fish swimming classification chamber (7) is provided with two rectifier tubes (8) therein, and mesh plates are provided on the water-facing side and the water-receiving side of the rectifier tube (8). The two rectifier tubes (8) are respectively located upstream of the large fish swimming area and downstream of the small fish swimming area.

8. The fish fry classification and transportation device based on the fish swimming ability according to claim 1 is characterized in that: The upper part of the fish inlet area of ​​the fish swimming classification chamber (7) is connected to a fish inlet funnel (10) which can be opened and closed.

9. A fry grading and conveying device based on the swimming ability of fish according to any one of claims 1 to 8, characterized in that: Also includes: A water storage tank (1) contains water, and the lowest end of the fish swimming classification chamber (7) faces downwardly to the interior of the water storage tank (1); A water inlet pipe (5), one end of which is connected to the water storage tank (1), and the other end of which is connected to the highest end of the fish swimming classification chamber (7); A high-flow submersible pump (3) based on frequency conversion control is installed in a water storage tank (1) and connected to a water inlet pipe (5).

10. A working method based on the fish fry grading and conveying device based on the swimming ability of fishes as claimed in claim 7, characterized in that: At least the following steps are included: Preparation step: loading the empty fry conveying tray (6) into the air cannon body (15); Classification steps: introducing water flow into the fish swimming classification chamber (7), inputting a number of fish bodies into the fish inlet area of ​​the fish swimming classification chamber (7), regulating the water flow, rectifying the water flow using a rectifier tube (8), and classifying the fish according to a curve of relationship between fish size and swimming ability. Large-sized fish bodies with stronger swimming ability will gather at the lower end surface of the upper rectifier tube (8), and small-sized fish bodies will be restricted to the upper end surface of the lower rectifier tube (8) due to the impact of the water flow, so that the large-sized fish bodies are placed in the upper fish rotating device (16) and the small-sized fish bodies are placed in the lower fish rotating device (16); Transfer step: driven by the respective power units, the upper fish transfer device (16) transfers the large-sized fish body to the corresponding air cannon body (15), and the lower fish transfer device (16) transfers the small-sized fish body to the corresponding air cannon body (15); Conveying step: after the fry enters the air cannon body (15), the fry conveying tray (6) is pushed into the conveying pipeline by compressed air, and the fry conveying tray (6) and the graded fry are conveyed into the corresponding fish pond together.

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