Population screening machine for pseudosciaena crocea

Abstract

The invention discloses a large yellow croaker population screening machine, and relates to the technical field of fry screening. The device comprises an upper cover plate and a lower cover plate, an outer screening basket and an inner screening basket are rotationally arranged between the upper cover plate and the lower cover plate in a threaded mode; the diameter of the outer screening basket is larger than that of the inner screening basket; a plurality of first passing plates are arranged on the outer wall of the outer screening basket; a plurality of first passing plates are arranged on the inner wall of the inner screening basket; a first passing groove penetrates through the side surface of the first passing plate; a second passing groove penetrates through the side surface of the second passing plate; telescopic assemblies are arranged on the side faces of the first passing plate and the second passing plate. By arranging the telescopic assembly and the reset plate, when fishes penetrate through (break away from) the telescopic assembly, the elastic rope is expanded, the reset plate is slowly pushed inwards (the elastic rope and the elastic ring retract, and then the reset plate is pulled to rotate and reset), and the reset plate only allows the fishes outside the outer screening basket or the inner screening basket to enter and cannot exit, so that the grabbing effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fish fry screening, and in particular relates to a population screening machine for large yellow croaker. Background Art

[0002] Large yellow croaker is a fish of the genus Yellow croaker of the family Sciaenidae in the order Perciformes. It is also known as yellow croaker, yellow croaker, big fresh, and cucumber. Large yellow croaker is distributed in the northwest Pacific Ocean and along the coast of China. It inhabits soft mud or silt bottom sea areas within a depth of 60 meters. It likes to gather in groups and has a wide diet, mainly feeding on crustaceans such as shrimps and crabs and small fish. It reproduces in spring and usually lays eggs near estuaries, inner bays, and islands. In the process of catching large yellow croaker, it is necessary to screen the large yellow croaker.

[0003] At present, the process of catching large yellow croaker is usually to catch the large yellow croaker underwater first, and then manually screen and classify the caught large yellow croaker. However, the entire screening and classification process of this method is basically manual operation, which not only requires a lot of manpower, but also has low work efficiency. In addition, some of the caught fish will contain young fish, which will damage the growth of the young fish and affect the quality of the catch.

[0004] To this end, we provide a population screening machine for large yellow croaker to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a population screening machine for large yellow croaker, by setting a telescopic component, and connecting the telescopic component and a reset plate through a linkage ring, when a fish swims in from the outside, when the fish passes through the telescopic component, the elastic rope is stretched and the reset plate is slowly pushed inward, when the fish escapes from the telescopic component, the elastic rope and the elastic ring are retracted, and then the reset plate is pulled to rotate and reset, and the reset plate can rotate toward the inside of the first passage slot or the second passage slot but cannot rotate toward the outside of the first passage slot or the second passage slot, therefore, the reset plate only allows the fish outside the outer screening basket or the inner screening basket to be reset. The fish can enter without allowing the fish in the outer screening basket or the inner screening basket to escape, thereby improving the catching effect. At the same time, the gaps formed between the reset plates and the release grooves on the surface of the upper cover (lower cover) allow immature young fish to swim out while not allowing larger fish to pass through, thereby preventing the young fish from being caught, ensuring the quality of the catch, and ensuring the economic benefits. The existing entire screening and classification process is basically manually operated, which not only requires a lot of manpower, but also has low work efficiency, and the fish caught will contain some young fish, which will damage the growth of the young fish.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention relates to a population screening machine for large yellow croaker, comprising two upper cover plates and a lower cover plate which are arranged opposite to each other; an outer screening basket and an inner screening basket which are threadedly arranged between the upper cover plate and the lower cover plate; the diameter of the outer screening basket is greater than the diameter of the inner screening basket; a plurality of first pass plates are evenly arranged on the outer wall of the outer screening basket in a circular array; a plurality of first pass plates are evenly arranged on the inner wall of the inner screening basket in a circular array; a first pass groove which is connected to the inside of the outer screening basket is penetrated through the side surface of the first pass plate; a second pass groove which is connected to the outside of the inner screening basket is penetrated through the side surface of the second pass plate; the diameter of the first pass groove is greater than the diameter of the second pass groove; and telescopic components are arranged on the sides of the first pass plate and the second pass plate.

[0008] The present invention is further configured such that the telescopic assembly includes a fixing ring and a plurality of elastic rings with successively increasing diameters; a plurality of elastic ropes are evenly connected in a circular array between each of the elastic rings and the fixing ring; and the fixing ring is fixed to the side of the first pass plate or the second pass plate by a fastening bolt.

[0009] The present invention is further configured such that a plurality of connecting rings movable on the elastic ring are arranged on the innermost elastic ring; one end of the elastic rope is fixed on the connecting ring, and the other end is fixed on the fixing ring; and linkage rings are fixed on a plurality of the elastic ropes.

[0010] The present invention is further configured such that the diameter of the innermost elastic ring on the first pass plate is larger than the diameter of the innermost elastic ring on the second pass plate; under this structural setting, large fish can pass through the telescopic assembly and the first pass groove on the first pass plate, and small fish can pass through the telescopic assembly and the first pass groove on the first pass plate, and the telescopic assembly and the second pass groove on the second pass plate.

[0011] The present invention is further configured such that the inner walls of the first passage groove and the second passage groove are evenly provided with a plurality of reset grooves in a circular array; the inner walls of the reset grooves are rotatably provided with a plurality of reset plates; a lifting ear is fixed to the side of the reset plate; and the lifting ear is fixedly connected to the adjacent linkage ring.

[0012] The present invention is further configured such that, under the connection relationship between the lifting ear and the linkage ring, when the fish passes through the telescopic assembly, the elastic rope is stretched and the reset plate is slowly pushed inward; when the fish leaves the telescopic assembly, the elastic rope and the elastic ring retract, thereby pulling the reset plate to rotate and reset.

[0013] The present invention is further configured such that the reset plate can rotate toward the inside of the first passage slot or the second passage slot but cannot rotate toward the outside of the first passage slot or the second passage slot; under this structural setting, the reset plate only allows fish outside the outer screening basket or the inner screening basket to enter, but does not allow fish inside the outer screening basket or the inner screening basket to leave.

[0014] The present invention is further configured such that a bait basket is threadedly arranged between the upper cover plate and the lower cover plate; the diameter of the bait basket is smaller than the diameter of the inner screening basket; a plurality of release grooves are provided through the surfaces of the upper cover plate and the lower cover plate; the gaps formed between the reset plates and the release grooves allow immature young fish to swim out.

[0015] The present invention is further configured as follows: a plurality of connecting plates are evenly fixed on the surface of the upper cover plate in a circular array; a detection plate is rotatably arranged on the side of the connecting plate; a gravity sensor is arranged inside the detection plate; connecting claws are connected between each of the detection plates; and a camera is arranged on the side surface of the upper cover plate.

[0016] The present invention is further configured as follows: a control box is placed on the shore; a counterweight is placed inside the control box, and a controller is arranged on the surface thereof; a guide plate is fixed to the side of the control box; a rope collecting roller is rotatably arranged on the side of the guide plate; an adjustment rope is connected between the rope collecting roller and the connecting claw.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention provides a telescopic component and connects the telescopic component and the reset plate through a linkage ring. When a fish swims in from the outside, the fish passes through the telescopic component, the elastic rope is stretched and the reset plate is slowly pushed inward. When the fish leaves the telescopic component, the elastic rope and the elastic ring retract, thereby pulling the reset plate to rotate and reset. The reset plate can rotate toward the inside of the first passage slot or the second passage slot but cannot rotate toward the outside of the first passage slot or the second passage slot. Therefore, the reset plate only allows fish outside the outer screening basket or the inner screening basket to enter, but does not allow fish inside the outer screening basket or the inner screening basket to go out, thereby improving the catching effect.

[0019] 2. The diameter of the first passage groove of the present invention is larger than that of the second passage groove. Therefore, large yellow croaker cannot enter the second passage groove and can only be stored in the gap formed between the outer screening basket and the inner screening basket. Small fish are stored inside the inner screening basket, thereby realizing automatic classification and screening and eliminating the manpower of manual classification and screening.

[0020] 3. The gaps formed between the reset plates of the present invention and the release grooves on the surface of the upper cover plate (lower cover plate) allow immature young fish to swim out while not allowing larger fish to pass through, thereby preventing the young fish from being caught, ensuring the quality of the catch, and ensuring economic benefits.

[0021] 4. A gravity sensor is provided inside the detection board of the present invention. When too many fish are caught, the gravity sensor will send a signal to the controller. At this time, the servo motor can be used to rotate the rope roller to pull the device out from underwater to prevent excessive number of fish from squeezing each other and ensure the quality of the catch. A camera is also provided to send the underwater situation to the controller and adjust the position of the device according to the number of fish, so as to place the device at a location with more adult fish as much as possible.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 The figure is a schematic diagram of the structure of a population screening machine for large yellow croaker.

[0025] Figure 2 It is a bottom view of the outer screen basket of the present invention.

[0026] Figure 3 It is a schematic diagram of the internal structure of the external screening basket of the present invention.

[0027] Figure 4 It is a schematic structural diagram of the external screening basket of the present invention.

[0028] Figure 5 It is a schematic structural diagram of the inner screening basket of the present invention.

[0029] Figure 6 It is a structural schematic diagram of the bait basket of the present invention.

[0030] Figure 7 It is a structural schematic diagram of the telescopic assembly of the present invention.

[0031] Figure 8 For the present invention Figure 1 A magnified image of area A.

[0032] Fig. 9 For the present invention Figure 1 A magnified view of area B.

[0033] Fig.10 For the present invention Figure 4 Magnified view of area C.

[0034] Fig.11 For the present invention Figure 4 A magnified view of area D.

[0035] Fig.12 For the present invention Fig.10 Enlarged view of area E.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 1-upper cover, 2-lower cover, 3-external screening basket, 4-inner screening basket, 5-first pass plate, 6-second pass plate, 7-first pass slot, 8-second pass slot, 9-telescopic assembly, 10-fixing ring, 11-elastic ring, 12-elastic rope, 13-connecting ring, 14-linkage ring, 15-reset slot, 16-reset plate, 17-lifting ear, 18-bait basket, 19-release slot, 20-connecting plate, 21-detection plate, 22-adjusting rope, 23-connecting claw, 24-camera, 25-control box, 26-counterweight, 27-controller, 28-guide plate, 29-rope collection roller. DETAILED DESCRIPTION

[0038] 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. Specific embodiment 1

[0040] See also Figure 1-12 The present invention is a population screening machine for large yellow croaker, comprising an upper cover plate 1 and a lower cover plate 2 which are arranged opposite to each other; an outer screening basket 3 and an inner screening basket 4 which are threadedly arranged between the upper cover plate 1 and the lower cover plate 2; the diameter of the outer screening basket 3 is larger than the diameter of the inner screening basket 4; a plurality of first pass plates 5 are evenly arranged on the outer wall of the outer screening basket 3 in a circular array; a plurality of second pass plates 6 are evenly arranged on the inner wall of the inner screening basket 4 in a circular array; a first pass groove 7 which is connected to the inside of the outer screening basket 3 is penetrated through the side surface of the first pass plate 5; a second pass groove 8 which is connected to the outside of the inner screening basket 4 is penetrated through the side surface of the second pass plate 6; the diameter of the first pass groove 7 is larger than the diameter of the second pass groove 8; telescopic components 9 are arranged on the sides of the first pass plate 5 and the second pass plate 6.

[0041] Specifically, the telescopic assembly 9 includes a fixing ring 10 and a plurality of elastic rings 11 with increasing diameters; a plurality of elastic ropes 12 are evenly connected in a circular array between each elastic ring 11 and the fixing ring 10; the fixing ring 10 is fixed to the side of the first pass plate 5 or the second pass plate 6 by fastening bolts.

[0042] Furthermore, the innermost elastic ring 11 is provided with a plurality of connecting rings 13 that can move on the elastic ring 11 ; one end of the elastic rope 12 is fixed on the connecting ring 13 , and the other end thereof is fixed on the fixing ring 10 ; and linkage rings 14 are fixed on a plurality of the elastic ropes 12 .

[0043] Furthermore, the diameter of the innermost elastic ring 11 on the first pass plate 5 is larger than the diameter of the innermost elastic ring 11 on the second pass plate 6; under this structural setting, large fish can pass through the telescopic assembly 9 and the first pass groove 7 on the first pass plate 5, and small fish can pass through the telescopic assembly 9 and the first pass groove 7 on the first pass plate 5, and the telescopic assembly 9 and the second pass groove 8 on the second pass plate 6.

[0044] The operation process of this embodiment is as follows: before use, the inner screen basket 4 and the outer screen basket 3 are screwed and fixed between the upper cover plate 1 and the lower cover plate 2, and some bait is placed in the inner screen basket 4. Then, a rope is fixed on the upper cover plate 1 to facilitate pulling the device up from underwater, and then the device is slowly lowered underwater. At this time, the fish underwater are attracted by the bait and swim toward the device. Then, large yellow croakers of different sizes can pass through the telescopic assembly 9 on the first pass plate 5. When passing through the telescopic assembly 9, the large yellow croakers first slowly expand the elastic ring 11, and then enter the first pass groove 7 and leave. Elastic ring 11, the elastic ring 11 shrinks and resets, the diameter of the innermost elastic ring 11 on the first pass plate 5 is larger than the diameter of the innermost elastic ring 11 on the second pass plate 6. Therefore, large-sized yellow croaker stays in the gap between the outer screening basket 3 and the inner screening basket 4, and small-sized yellow croaker can pass through the telescopic component 9 on the second pass plate 6. When passing through the telescopic component 9, the large yellow croaker first slowly expands the elastic ring 11, then enters the second pass groove 8 and breaks away from the elastic ring 11, and the elastic ring 11 shrinks and resets. When fishing is finished, the device can be pulled out of the water with a rope.

[0045] Since the young fish are small in size, they can freely pass through the telescopic component 9. Therefore, the young yellow croakers swimming into the outer screening basket 3 and the inner screening basket 4 can swim out of the second passage slot 8 and the first passage slot 7, and swim out of the device through the telescopic component 9, thereby preventing the young yellow croakers from being caught, ensuring the quality of the catch, and ensuring economic benefits. In addition, the diameter of the first passage slot 7 is larger than the diameter of the second passage slot 8, so that large yellow croakers cannot enter the second passage slot 8 and can only be stored in the gap formed between the outer screening basket 3 and the inner screening basket 4. Small fish are stored in the inner screening basket 4, thereby realizing automatic classification and screening, and eliminating the manpower of manual classification and screening. Specific embodiment 2

[0047] See also Figure 1-12On the basis of the first specific embodiment, a plurality of reset grooves 15 are evenly arranged in a circular array on the inner wall of the first passage groove 7 and the second passage groove 8; a plurality of reset plates 16 are rotatably arranged on the inner wall of the reset groove 15; a lifting ear 17 is fixed on the side of the reset plate 16; and the lifting ear 17 is fixedly connected to the adjacent linkage ring 14.

[0048] Specifically, under the connection relationship between the lifting ear 17 and the linkage ring 14, when the fish passes through the telescopic assembly 9, the elastic rope 12 is stretched and the reset plate 16 is slowly pushed inward. When the fish leaves the telescopic assembly 9, the elastic rope 12 retracts and pulls the elastic ring 11 to retract, thereby pulling the reset plate 16 to rotate and reset.

[0049] Furthermore, the reset plate 16 can rotate toward the inside of the first passage groove 7 or the second passage groove 8 but cannot rotate toward the outside of the first passage groove 7 or the second passage groove 8; under this structural setting, the reset plate 16 only allows fish outside the outer screening basket 3 or the inner screening basket 4 to enter, but does not allow fish inside the outer screening basket 3 or the inner screening basket 4 to go out.

[0050] Furthermore, a bait basket 18 is threadedly arranged between the upper cover plate 1 and the lower cover plate 2; the diameter of the bait basket 18 is smaller than the diameter of the inner screening basket 4; a plurality of release grooves 19 are provided through the surfaces of the upper cover plate 1 and the lower cover plate 2; the gaps formed between the reset plates 16 and the release grooves 19 allow immature young fish to swim out.

[0051] The operation process of this embodiment is as follows: baits are placed in the inner screen basket 4 through the bait basket 18. Before using the device, baits are placed in the bait basket 18 and threadedly connected between the upper cover plate 1 and the lower cover plate 2.

[0052] When the large yellow croaker passes through the telescopic component 9, the elastic ring 11 is first slowly expanded, and then the large yellow croaker contacts the reset plate 16, pushing the reset plate 16 to rotate toward the inside of the first passage groove 7 (or the second passage groove 8), so that all the reset plates 16 tend to move away from each other, and then the large yellow croaker can pass smoothly. When the large yellow croaker leaves the reset plate 16, the elastic ring 11 and the elastic rope 12 retract and reset, and at the same time the linkage ring 14 and the ear 17 are pulled by the elastic rope 12, so that the reset plate 16 is driven to rotate and reset. The reset plate 16 can rotate toward the inside of the first passage groove 7 or the second passage groove 8 but cannot rotate toward the outside of the first passage groove 7 or the second passage groove 8. Therefore, the reset plate 16 only allows the fish outside the outer sub-screen basket 3 or the inner sub-screen basket 4 to enter, but does not allow the fish inside the outer sub-screen basket 3 or the inner sub-screen basket 4 to go out. The young fish can swim out through the gaps formed between the reset plates 16 and the release groove 19.

[0053] The gaps formed between the reset plates 16 and the release grooves 19 on the surface of the upper cover plate 1 (lower cover plate 2) allow immature young fish to swim out while not allowing larger fish to pass through, thereby preventing the young fish from being caught, ensuring the quality of the catch and ensuring economic benefits. Specific embodiment three

[0055] See also Figure 1-12 On the basis of the specific embodiment 1 and the specific embodiment 2, a plurality of connecting plates 20 are evenly fixed on the surface of the upper cover plate 1 in a circular array; a detection plate 21 is rotatably arranged on the side of the connecting plate 20; a gravity sensor is arranged inside the detection plate 21; connecting claws 23 are connected between each detection plate 21; and a camera 24 is arranged on the side of the upper cover plate 1.

[0056] Specifically, a control box 25 is placed on the shore; a counterweight 26 is placed inside the control box 25, and a controller 27 is provided on its surface; a guide plate 28 is fixed to the side of the control box 25; a rope collecting roller 29 is rotatably provided on the side of the guide plate 28; an adjustment rope 22 is connected between the rope collecting roller 29 and the connecting claw 23.

[0057] The operation process of this embodiment is as follows: a monitoring device and a servo motor are set up on the shore, the output end of the servo motor is fixedly connected to the rope-collecting roller 29, the input end of the controller 27 on the surface of the control box 25 is connected to the camera 24 and the gravity sensor through communication, and its output end is electrically connected to the servo motor. When using the device for fishing, firstly, the servo motor is driven by the controller 27 to rotate to drive the rope-collecting roller 29 to rotate, so that the adjustment rope 22 drives the device to slowly descend along the guide plate 28, and the underwater gravity sensor monitors the weight of the device in real time, and then fishing is carried out underwater. The underwater situation can be observed in real time through the camera 24, so that the staff can adjust the position of the device according to the underwater situation. When the caught fish reaches a certain weight range, the staff drives the servo motor through the controller 27 to rotate to drive the rope-collecting roller 29 to rotate and reel in the adjustment rope 22, so that the adjustment rope 22 pulls the device out of the water along the guide plate 28.

[0058] The gravity sensor can prevent the number of fish from being too large, and the fish from squeezing each other and affecting the quality of the catch. The camera 24 can send the underwater situation to the controller 27 and adjust the position of the device according to the number of fish, and place the device in a position where there are more adult large yellow croakers as much as possible.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A large yellow croaker population screening machine, comprising two upper cover plates (1) and a lower cover plate (2) arranged opposite to each other; characterized in that: An outer sieve basket (3) and an inner sieve basket (4) are threadably arranged between the upper cover plate (1) and the lower cover plate (2); the diameter of the outer sieve basket (3) is greater than the diameter of the inner sieve basket (4); The outer wall of the outer screening basket (3) is evenly provided with a plurality of first pass plates (5) in a circular array; the inner wall of the inner screening basket (4) is evenly provided with a plurality of second pass plates (6) in a circular array; A first passage groove (7) is formed through the side surface of the first passage plate (5) and is connected to the inside of the outer screening basket (3); a second passage groove (8) is formed through the side surface of the second passage plate (6) and is connected to the outside of the inner screening basket (4); The diameter of the first passage groove (7) is greater than the diameter of the second passage groove (8); and telescopic components (9) are provided on the sides of the first passage plate (5) and the second passage plate (6).

2. A large yellow croaker population screening machine according to claim 1, characterized in that: The telescopic assembly (9) comprises a fixing ring (10) and a plurality of elastic rings (11) with diameters increasing in sequence; a plurality of elastic ropes (12) are evenly connected in a circular array between each of the elastic rings (11) and the fixing ring (10); the fixing ring (10) is fixed to the side of the first passage plate (5) or the second passage plate (6) by means of fastening bolts.

3. A population screening machine for large yellow croaker according to claim 2, characterized in that: The innermost elastic ring (11) is provided with a plurality of connecting rings (13) movable on the elastic ring (11); one end of the elastic rope (12) is fixed on the connecting ring (13), and the other end is fixed on the fixing ring (10); and linkage rings (14) are fixed on a plurality of the elastic ropes (12).

4. A population screening machine for large yellow croaker according to claim 3, characterized in that: The diameter of the innermost elastic ring (11) on the first passage plate (5) is larger than the diameter of the innermost elastic ring (11) on the second passage plate (6); under this structural setting, large-sized fish can pass through the telescopic component (9) and the first passage groove (7) on the first passage plate (5), and small-sized fish can pass through the telescopic component (9) and the first passage groove (7) on the first passage plate (5) and the telescopic component (9) and the second passage groove (8) on the second passage plate (6).

5. A population screening machine for large yellow croaker according to claim 4, characterized in that: The inner walls of the first passage groove (7) and the second passage groove (8) are evenly provided with a plurality of reset grooves (15) in a circumferential array; the inner walls of the reset grooves (15) are rotatably provided with a plurality of reset plates (16); a lifting lug (17) is fixed to the side of the reset plate (16); and the lifting lug (17) is fixedly connected to an adjacent linkage ring (14).

6. A large yellow croaker population screening machine according to claim 5, characterized in that: Under the connection relationship between the lifting ear (17) and the linkage ring (14), when the fish passes through the telescopic assembly (9), the elastic rope (12) is stretched and the reset plate (16) is slowly pushed inward; when the fish leaves the telescopic assembly (9), the elastic rope (12) retracts and pulls the elastic ring (11) to retract, thereby pulling the reset plate (16) to rotate and reset.

7. A large yellow croaker population screening machine according to claim 6, characterized in that: The reset plate (16) can rotate toward the inside of the first passage groove (7) or the second passage groove (8) but cannot rotate toward the outside of the first passage groove (7) or the second passage groove (8); under this structural setting, the reset plate (16) only allows fish outside the outer screening basket (3) or the inner screening basket (4) to enter, but does not allow fish inside the outer screening basket (3) or the inner screening basket (4) to leave.

8. A large yellow croaker population screening machine according to claim 7, characterized in that: A bait placing basket (18) is threadably provided between the upper cover plate (1) and the lower cover plate (2); the diameter of the bait placing basket (18) is smaller than the diameter of the inner screening basket (4); a plurality of release grooves (19) are provided through the surfaces of the upper cover plate (1) and the lower cover plate (2); the gaps formed between the reset plates (16) and the release grooves (19) allow immature young fish to swim out.

9. A large yellow croaker population screening machine according to claim 8, characterized in that: A plurality of connecting plates (20) are evenly fixed in a circular array on the surface of the upper cover plate (1); a detection plate (21) is rotatably arranged on the side of the connecting plate (20); a gravity sensor is arranged inside the detection plate (21); connecting claws (23) are connected between each of the detection plates (21); and a camera (24) is arranged on the circumferential side of the upper cover plate (1).

10. A large yellow croaker population screening machine according to claim 9, characterized in that: A control box (25) is placed on the shore; a counterweight (26) is placed inside the control box (25), and a controller (27) is arranged on the surface of the control box (25); a guide plate (28) is fixed on the side of the control box (25); a rope collecting roller (29) is rotatably arranged on the side of the guide plate (28); an adjustment rope (22) is connected between the rope collecting roller (29) and the connecting claw (23).

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