Aquaculture seedling screening device and seedling screening method

Abstract

This invention discloses a seedling screening device and method for aquaculture, specifically relating to the field of seedling screening technology. It includes a base with a screening assembly mounted on it, comprising an acrylic transparent cover mounted on top of the base. Through the coordinated use of various structures, this invention avoids the fish schooling effect that causes fish fry to gather together. The fish fry are separated by screening through screen plates and screen holes. The screen holes on each screen plate are arranged side-by-side from small to large, allowing fish fry of different sizes to be screened step-by-step. This achieves the function of separating and transporting fish fry of different sizes, avoiding situations with large size differences. This allows fish to swim into the corresponding screen cover according to the size of the screen hole, achieving an active size screening function and also screening out weaker fish fry, thus improving the quality of seedling screening.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture seedling screening, and more specifically, to an aquaculture seedling screening device and a seedling screening method thereof. Background Art

[0002] Factory aquaculture is the product of the combined development of industry, technology and fishery. It is a breeding model that integrates different technical elements. Its characteristics are the integration of modern technologies such as civil engineering, mechanical electronics, instrumentation, chemistry, bioengineering, automatic control and socioeconomics. It implements semi-automatic or fully automatic monitoring of water quality, water flow, water temperature, feeding, sewage discharge, disease prevention, water treatment and recycling in the whole process of breeding production, so that it can maintain suitable physiological and ecological conditions from beginning to end under high-density breeding conditions without causing internal and external environmental pollution, so as to achieve the health and rapid growth of breeding objects and improve the unit water output and quality. When aquatic products are farmed in factories, the fish or shrimp fry in the same pond need to be screened and classified at regular intervals to avoid large differences in the size of the fish or shrimp fry and the phenomenon of "big fish eating small fish".

[0003] Among them, the patent with publication number CN116019045A discloses an aquaculture seedling screening device, which belongs to the technical field of aquaculture seedling screening. An aquaculture seedling screening device, characterized in that it includes: a support member; a lifting assembly, the number of which is at least 3 groups, all independently arranged on the support member; a connecting assembly, the connecting assembly is respectively connected to all the lifting assemblies; and a screen assembly, the screen assembly is located between all the lifting assemblies and connected to the connecting assembly; all the lifting assemblies work independently, driving the screen assembly to rise and fall or shake in the vertical direction;

[0004] When the structure is in use, through multiple independent lifting components, when the lifting height positions and changes of all lifting components are consistent, the screen component can be driven to lift and lower in the vertical direction, so as to facilitate the placement of fish fry or shrimp fry into the screen component. When the lifting heights and positions of all lifting components are in sequence, the screen component can be shaken to speed up the screening of fish fry or shrimp fry. However, the structure only screens the fish fry that can pass through the second screen between the first and second screens by shaking the screen fry, which results in low screening accuracy and inability to achieve the function of multi-stage screening. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an aquaculture seedling screening device and a seedling screening method thereof, aiming to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an aquaculture seedling screening device and a seedling screening method thereof, comprising a base, on which a sub-screening assembly is arranged;

[0007] The sub-screening assembly includes an acrylic transparent cover arranged on the top of the base, a guide cavity is formed between the base and the acrylic transparent cover, cabinet doors are movably connected to both sides of the surface of the acrylic transparent cover through hinges, a support frame is installed between the acrylic transparent cover and the base through bolts, a plurality of conveying pipes are installed on one side of the surface of the cabinet door through a flange, and the plurality of conveying pipes are respectively located on one side of the corresponding screen cover and connected to the frame opening, and a storage box is provided on one side of the surface of each conveying pipe, and the storage box is installed on the cabinet door through bolts.

[0008] It can be seen that in the above technical solution, when fry of different sizes are retained in the corresponding screen cover, the fish school swims toward the frame opening and is guided through the conveying pipe to be transported to the storage box, which makes it easy for the staff to classify and process the fry of different sizes.

[0009] A rotating shaft is arranged in the guide chamber, and a plurality of support frames are installed on the rotating shaft through flanges, a plurality of cross bars are installed on the outer side of the support frame through bolts, and a plurality of sieve plates are installed between each two adjacent cross bars through bolts, one end of the plurality of sieve plates extends to the outer side of the rotating shaft and is clamped with the rotating shaft, sieve holes are penetrated through the plurality of sieve plates, and the sieve holes belonging to each sieve plate are arranged side by side from small to large, an impeller is installed on one end of the rotating shaft through a flange, and the impeller is located between the plurality of cross bars, a plurality of sieve covers are sleeved on the outer side of the cross bar, and frame openings are penetrated on one side of the surface of the plurality of sieve covers, the outer side of the sieve cover is installed on the inner wall of the acrylic transparent cover through bolts, and the inner side of the sieve cover is rotatably connected with an inner lining partition, and the inner lining partition is located on the outer side of the cross bar and is clamped with the cross bar.

[0010] It can be seen that in the above technical solution, when the rotating shaft rotates, it drives each supporting frame, cross bar and sieve plate to rotate at the same time. When the cross bar and sieve plate rotate, it drives each lining partition plate to rotate, so that the fry are screened and diverted through the sieve plate and sieve holes, and the sieve holes on each sieve plate are arranged side by side from small to large, so that fry of different sizes can be screened step by step through each sieve hole, realizing the function of diverting and transporting fry of different sizes, avoiding the situation of large difference in body size. When the impeller rotates, it will generate traction to transport water to flow in the acrylic transparent cover and the base, and then with the survival instinct of fish, the fry will flow toward the impeller, so that the fish can swim into the corresponding sieve cover according to the sieve holes of different sizes, realizing the function of active size screening, and can also screen out fry with weak vitality, thereby improving the quality of screened fry.

[0011] A support plate is installed at one end of the base by bolts, and a variable frequency motor is installed at the other end of the base by bolts, the output end of the variable frequency motor is connected to the rotating shaft by a coupling, and one end of the rotating shaft extends to the support plate and is rotatably connected to the support plate, a sealing cover ring is provided on one side of the support plate, the sealing cover ring is installed on the base and one end of the acrylic transparent cover by a flange, and the sealing cover ring extends to one end of the cross bar and is rotatably connected to the cross bar, a feed hopper is provided on one side of the sealing cover ring, a docking head is fixedly provided on one side of the bottom of the feed hopper, the docking head extends to the middle part of the sealing cover ring and is detachably connected to the sealing cover ring by bolts, a sealing gasket is provided between the docking head and the sealing cover ring, and a diverter bevel is fixedly provided on the middle part of the docking head, the diverter bevel cover is provided on the outside of the rotating shaft, and the diverter bevel is arranged obliquely upward.

[0012] It can be seen that in the above technical solution, the fry are added into the feed hopper, diverted by the diverter bevel and transported to between the acrylic transparent cover and the base and screened through various screen covers to avoid the fish school effect from gathering together.

[0013] A seedling screening method, using the above-mentioned aquaculture seedling screening device, comprises the following steps:

[0014] Step 1: The staff installs the device at the designated location. When screening the fry, the fry are added into the feed hopper, diverted by the diverter block and transported to the acrylic transparent cover and the base to be screened through each screen cover to avoid the fish school effect.

[0015] Step 2: When the fry are screened in each screen cover, the frequency conversion motor drives the rotating shaft to rotate, and the rotating shaft drives the supporting frames, cross bars and screen plates to rotate at the same time. When the cross bars and screen plates rotate, they drive the inner lining partitions to rotate, so that the fry are screened and diverted through the screen plates and screen holes, and the screen holes on each screen plate are arranged side by side from small to large, so that fry of different sizes can be screened step by step through each screen hole, so as to realize the function of diverting and transporting fry of different sizes, and avoid the situation where the size difference is large;

[0016] Step 3: When the rotating shaft, support frame and cross bar rotate, the impeller can also be driven to rotate. When the impeller rotates, it will generate traction to convey water to flow in the acrylic transparent cover and the base. Combined with the survival instinct of fish, the fry will flow toward the impeller, so that the fish can swim into the corresponding sieve cover according to the different sizes of sieve holes, realizing the function of active size screening, and can also screen out the fry with weak vitality, improving the quality of screened fry;

[0017] Step 4: When the fry of different sizes are retained in the corresponding screen cover, the fish school swims toward the frame opening and is guided through the conveying pipeline to be conveyed into the storage box, which makes it easy for the staff to classify and process the fry of different sizes.

[0018] Technical effects and advantages of the present invention:

[0019] The present invention adds the fry into the feed hopper, diverts the fry through the diverter inclined block and transports the fry to between the acrylic transparent cover and the base, and screens the fry through each screen cover to avoid the fish school effect from gathering together.

[0020] The invention drives the rotating shaft to rotate through a variable frequency motor, and when the rotating shaft rotates, it drives each supporting frame, cross bar and screen plate to rotate simultaneously. When the cross bar and screen plate rotate, it drives each lining partition plate to rotate, so that the fry are screened and diverted through the screen plate and the screen holes, and the screen holes on each screen plate are arranged side by side from small to large, so that fry of different sizes can be screened step by step through each screen hole, so as to realize the function of diverting and transporting fry of different sizes, and avoid the situation where the size difference is large;

[0021] The present invention uses the traction force generated by the rotation of the impeller to convey water to flow in the acrylic transparent cover and the base. Combined with the survival instinct of the fish, the fry will flow toward the impeller, so that the fish can swim into the corresponding screen cover according to the screen holes of different sizes, realizing the function of active size screening, and can also screen out the fry with weak vitality, thereby improving the quality of screened fry;

[0022] When the fry of different sizes are retained in the corresponding screen cover, the fish school swims toward the frame opening and is guided through the conveying pipeline to be conveyed into the storage box, so that the staff can easily classify and process the fry of different sizes.

[0023] To sum up, the overall design is simple and the structure is reasonable. Through the corresponding coordinated use of various structures, the fry are diverted by the diversion oblique block and transported to the acrylic transparent cover and the base for screening through various screen covers to avoid the occurrence of fish school effect causing the fry to gather together. The fry are screened and diverted by the screen plate and the screen holes, and the screen holes on each screen plate are arranged side by side from small to large, so that fry of different sizes can be screened step by step through each screen hole, realizing the function of diverting and transporting fry of different sizes, avoiding the situation of large differences in body size. When the impeller rotates, it will generate traction to transport water to flow in the acrylic transparent cover and the base. Combined with the survival instinct of fish, the fry will flow toward the impeller, so that the fish school can swim into the corresponding screen cover according to the screen holes of different sizes, realizing the function of active size screening, and can also screen out fry with weak vitality, thereby improving the quality of screened fry. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention, the following briefly introduces the drawings required to be used in some embodiments of the present invention. Obviously, the drawings described below are only drawings of some embodiments of the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present invention, the actual process of the method, the actual timing of the signal, etc.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a top view of the overall structure of the present invention.

[0027] Figure 3 It is a side view of the screening assembly of the present invention.

[0028] Figure 4 It is a three-dimensional view of the screen cover, liner partition and storage box of the present invention.

[0029] Figure 5 It is a stereoscopic view of the screening assembly of the present invention.

[0030] Figure 6 This is a stereoscopic view of the impeller, cross bar, sealing cover ring and feed hopper of the present invention when they are installed together.

[0031] Figure 7 It is a stereoscopic view of the screen plate, rotating shaft, supporting frame and cross bar of the present invention when they are installed together.

[0032] Figure 8 It is a stereoscopic view of the butt joint, diverter ramp and feed hopper of the present invention.

[0033] The accompanying drawings are marked as follows:

[0034] 1. Base; 101. Acrylic transparent cover; 102. Cabinet door; 103. Support frame; 104. Delivery pipeline; 105. Storage box;

[0035] 2. Rotating shaft; 201. Support frame; 202. Cross bar; 203. Screen plate; 204. Screen hole; 205. Impeller; 206. Screen cover; 207. Lining partition; 208. Frame opening;

[0036] 3. Support plate; 301. Frequency conversion motor; 302. Sealing cover ring; 303. Feed hopper; 304. Butt joint; 305. Diverter block. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0038] The terms "first", "second", "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] As attached Figure 1-8 The fry screening device and fry screening method shown in the figure, through the screening assembly arranged on the base 1, the fry are diverted by the diverting inclined block 305 and transported to the acrylic transparent cover 101 and the base 1 through each screen cover 206 for screening, so as to avoid the fish school effect from gathering together, the fry are screened and diverted by the screen plate 203 and the screen hole 204, and the screen holes 204 on each screen plate 203 are arranged side by side from small to large, so that fry of different sizes can be screened step by step through each screen hole 204, The function of diverting and conveying fry of different sizes is now implemented to avoid the situation where there is a large difference in body size. When the impeller 205 rotates, traction is generated to convey water to flow in the acrylic transparent cover 101 and the base 1. Combined with the survival instinct of the fish, the fry will flow toward the impeller 205, so that the fish can swim into the corresponding screen cover 206 according to the screen holes 204 of different sizes, realizing the function of active size screening, and can also screen out fry with weak vitality, thereby improving the quality of screened fry, and the specific structural arrangement of the component is as follows;

[0041] The screening assembly includes an acrylic transparent cover 101 arranged on the top of the base 1, a guide cavity is formed between the base 1 and the acrylic transparent cover 101, cabinet doors 102 are movably connected to the surface of the acrylic transparent cover 101 on both sides through hinges, a support frame 103 is installed between the acrylic transparent cover 101 and the base 1 by bolts, a plurality of conveying pipes 104 are installed on one side of the surface of the cabinet door 102 by flanges, and the plurality of conveying pipes 104 are respectively located on one side of the corresponding sieve cover 206 and are connected to the frame opening 208, and a storage box 105 is provided on one side of the surface of each conveying pipe 104, and the storage box 105 is installed on the cabinet door 102 by bolts.

[0042] A rotating shaft 2 is arranged in the flow guide cavity, and a plurality of support frames 201 are installed on the rotating shaft 2 through a flange, and a plurality of cross bars 202 are installed on the outer side of the support frame 201 through bolts, and a plurality of sieve plates 203 are installed between each two adjacent cross bars 202 through bolts, and one end of the plurality of sieve plates 203 extends to the outer side of the rotating shaft 2 and is clamped with the rotating shaft 2, and a plurality of sieve plates 203 are penetrated and opened with sieve holes 204, and the sieve holes 204 belonging to each sieve plate 203 are arranged side by side from small to large. An impeller 205 is installed at one end of the rotating shaft 2 through a flange. The impeller 205 is located between a plurality of cross bars 202. A plurality of sieve covers 206 are sleeved on the outer side of the cross bar 202. A frame opening 208 is penetrated on one side of the surface of the plurality of sieve covers 206. The outer side of the sieve cover 206 is installed on the inner wall of the acrylic transparent cover 101 by bolts, and the inner lining partition 207 is rotatably connected to the inside of the sieve cover 206. The lining partition 207 is located on the outer side of the cross bar 202 and is clamped with the cross bar 202.

[0043] A support plate 3 is installed at one end of the base 1 by bolts, and a variable frequency motor 301 is installed at the other end of the base 1 by bolts. The output end of the variable frequency motor 301 is connected to the rotating shaft 2 through a coupling, and one end of the rotating shaft 2 extends to the support plate 3 and is rotatably connected to the support plate 3. A sealing cover ring 302 is provided on one side of the support plate 3. The sealing cover ring 302 is installed at one end of the base 1 and the acrylic transparent cover 101 through a flange, and the sealing cover ring 302 extends to one end of the cross bar 202 and is connected to the cross bar 20 2 is rotatably connected, a feed hopper 303 is provided on one side of the sealing cover ring 302, a docking head 304 is fixedly provided on one side of the bottom of the feed hopper 303, the docking head 304 extends to the middle of the sealing cover ring 302 and is detachably connected to the sealing cover ring 302 by bolts, a sealing gasket is provided between the docking head 304 and the sealing cover ring 302, and a diverter oblique block 305 is fixedly provided in the middle of the docking head 304, the diverter oblique block 305 is covered on the outside of the rotating shaft 2, and the diverter oblique block 305 is arranged obliquely upward.

[0044] A seedling screening method, using the above-mentioned aquaculture seedling screening device, comprises the following steps:

[0045] Step 1: The staff installs the device at the designated position. When screening the fry, the fry is added into the feed hopper 303, the fry is diverted by the diverter block 305 and transported to the space between the acrylic transparent cover 101 and the base 1 and screened by each screen cover 206 to avoid the fish school effect from gathering together;

[0046] Step 2: When the fry are screened in each sieve cover 206, the frequency conversion motor 301 drives the rotating shaft 2 to rotate, and the rotating shaft 2 drives each supporting frame 201, the cross bar 202 and the sieve plate 203 to rotate simultaneously. When the cross bar 202 and the sieve plate 203 rotate, each lining partition plate 207 is driven to rotate, so that the fry are screened by the sieve plate 203 and the sieve holes 204 for diversion, and the sieve holes 204 on each sieve plate 203 are arranged side by side from small to large, so that fry of different sizes can be screened step by step through each sieve hole 204, so as to realize the function of diverting and conveying fry of different sizes, and avoid the situation of large differences in body size;

[0047] Step 3: When the rotating shaft 2, the support frame 201 and the cross bar 202 rotate, the impeller 205 can also be driven to rotate. When the impeller 205 rotates, traction is generated to convey water to flow in the acrylic transparent cover 101 and the base 1. Combined with the survival instinct of the fish, the fry will flow toward the impeller 205, so that the fish can swim into the corresponding sieve cover 206 according to the sieve holes 204 of different sizes, realizing the function of active size screening, and can also screen out the fry with weak vitality, thereby improving the quality of screened fry;

[0048] Step 4: When the fry of different sizes are retained in the corresponding screen cover 206, the fish school swims toward the frame opening 208 and is guided through the conveying pipe 104 to be conveyed to the storage box 105, which makes it easy for the staff to classify the fry of different sizes.

[0049] When in use according to the above structure, the fry are added into the feed hopper 303, diverted by the diverter bevel 305 and transported to the space between the acrylic transparent cover 101 and the base 1 and screened by each sieve cover 206, the frequency conversion motor 301 drives the rotating shaft 2 to rotate, and when the rotating shaft 2 rotates, it drives each support frame 201, the cross bar 202 and the sieve plate 203 to rotate at the same time, and when the cross bar 202 and the sieve plate 203 rotate, it drives each lining partition 207 to rotate, so that fry of different sizes can be screened step by step through each sieve hole 204.

[0050] When the impeller 205 rotates, traction is generated to convey water to flow in the acrylic transparent cover 101 and the base 1. Combined with the survival instinct of fish, the fry will flow toward the impeller 205, so that the fish can swim into the corresponding screen cover 206 according to the sieve holes 204 of different sizes. When the fry of different sizes are retained in the corresponding screen cover 206, the fish swim toward the frame opening 208 and are guided through the conveying pipe 104 to be transported to the storage box 105.

[0051] Different from the prior art, the present application discloses an aquaculture seedling screening device and a seedling screening method thereof. The fry are diverted by the diverting inclined block 305 and transported to the acrylic transparent cover 101 and the base 1 for screening through each screen cover 206 to avoid the fish school effect from gathering together. The fry are screened and diverted by the screen plate 203 and the screen holes 204, and the screen holes 204 on each screen plate 203 are arranged side by side from small to large, so that fry of different sizes can be screened through each screen hole 204. The fry are screened step by step to realize the function of diverting and transporting fry of different sizes, avoiding the situation of large differences in body size. When the impeller 205 rotates, it will generate traction to transport water to flow in the acrylic transparent cover 101 and the base 1. Combined with the survival instinct of the fish, the fry will flow toward the impeller 205, so that the fish can swim into the corresponding sieve cover 206 according to the sieve holes 204 of different sizes, realizing the function of active size screening, and can also screen out fry with weak vitality, thereby improving the quality of screened fry.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An aquaculture seedling screening device, comprising a base (1), characterized in that: The base (1) is provided with a screening assembly; The sub-screening assembly comprises an acrylic transparent cover (101) arranged on the top of the base (1), and a flow guide cavity is formed between the base (1) and the acrylic transparent cover (101); A rotating shaft (2) is arranged in the flow guide cavity, a plurality of support frames (201) are mounted on the rotating shaft (2) via flanges, a plurality of cross bars (202) are mounted on the outer side of the support frame (201) via bolts, and a plurality of sieve plates (203) are mounted between each two adjacent cross bars (202) via bolts, one end of each of the sieve plates (203) extends to the outer side of the rotating shaft (2) and is clamped with the rotating shaft (2), and the plurality of sieve plates (203) are 03) are all provided with sieve holes (204), and the sieve holes (204) belonging to each sieve plate (203) are arranged side by side from small to large, an impeller (205) is installed at one end of the rotating shaft (2) through a flange, and the impeller (205) is located between a plurality of cross bars (202), and a plurality of sieve covers (206) are sleeved on the outer side of the cross bars (202), and a frame opening (208) is provided on one side of the surface of the plurality of sieve covers (206); Cabinet doors (102) are movably connected to both sides of the surface of the acrylic transparent cover (101) via hinges, and a support frame (103) is installed between the acrylic transparent cover (101) and the base (1) via bolts; A plurality of delivery pipes (104) are installed on one side of the surface of the cabinet door (102) via a flange, the plurality of delivery pipes (104) are respectively located on one side of a corresponding screen cover (206) and are connected to a frame opening (208), and a storage box (105) is provided on one side of the surface of each delivery pipe (104), and the storage box (105) is installed on the cabinet door (102) via bolts; The outer side of the sieve cover (206) is mounted on the inner wall of the acrylic transparent cover (101) by means of bolts, and the interior of the sieve cover (206) is rotatably connected with an inner lining partition (207), wherein the inner lining partition (207) is located on the outer side of the cross bar (202) and is clamped with the cross bar (202).

2. The aquaculture seedling screening device according to claim 1, characterized in that: A support plate (3) is mounted on one end of the base (1) by means of bolts, and a variable frequency motor (301) is mounted on the other end of the base (1) by means of bolts; an output end of the variable frequency motor (301) is connected to a rotating shaft (2) by means of a coupling, and one end of the rotating shaft (2) extends to the support plate (3) and is rotatably connected to the support plate (3).

3. The aquaculture seedling screening device according to claim 2, characterized in that: A sealing cover ring (302) is provided on one side of the support plate (3), and the sealing cover ring (302) is installed on the base (1) and one end of the acrylic transparent cover (101) through a flange, and the sealing cover ring (302) extends to one end of the cross bar (202) and is rotatably connected to the cross bar (202).

4. The aquaculture seedling screening device according to claim 3, characterized in that: A feed hopper (303) is provided on one side of the sealing cover ring (302), and a docking head (304) is fixedly provided on one side of the bottom of the feeding hopper (303); the docking head (304) extends to the middle of the sealing cover ring (302) and is detachably connected to the sealing cover ring (302) via bolts.

5. The aquaculture seedling screening device according to claim 4, characterized in that: A sealing gasket is provided between the butt joint (304) and the sealing cover ring (302), and a diverter block (305) is fixedly provided in the middle of the butt joint (304).

6. The aquaculture seedling screening device according to claim 5, characterized in that: The diverter block (305) is covered on the outside of the rotating shaft (2), and the diverter block (305) is arranged to be inclined upward.

7. A seedling screening method, comprising the aquaculture seedling screening device according to claims 1 to 6, characterized in that: The following steps are included: Step 1, adding the fry into the feed hopper (303), diverting the fry through the diverter block (305) and conveying the fry to between the acrylic transparent cover (101) and the base (1) and passing through each sieve cover (206) for sieving; Step 2: The frequency conversion motor (301) drives the rotating shaft (2) to rotate. When the rotating shaft (2) rotates, it drives each support frame (201), the cross bar (202) and the sieve plate (203) to rotate simultaneously. When the cross bar (202) and the sieve plate (203) rotate, they drive each lining partition plate (207) to rotate, so that fry of different sizes can be screened step by step through each sieve hole (204); Step 3: When the impeller (205) rotates, it generates traction to transport water to flow in the acrylic transparent cover (101) and the base (1). In combination with the survival instinct of the fish, the fry will flow toward the impeller (205), so that the fish can swim into the corresponding sieve cover (206) according to the sieve holes (204) of different sizes; Step 4: When the fry of different sizes are retained in the corresponding screen cover (206), the fish school swims toward the frame opening (208) and is guided through the conveying pipe (104) and conveyed to the storage box (105).

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