Crab seed screening device for aquaculture

Abstract

The invention discloses a juvenile crab screening device for aquaculture, and relates to the technical field of aquaculture, the juvenile crab screening device comprises a box body filled with water, a screening assembly is arranged in the box body, the juvenile crab screening device further comprises a separation mechanism, the separation mechanism comprises a motor fixedly installed on one side of the box body, the inner wall of the box body is rotationally connected with a jacking disc, and a pull-back assembly is arranged in the box body; the pull-back assembly comprises a connecting frame slidably connected into the box body, a spring telescopic rod is fixedly connected between the connecting frame and the box body, a supporting rod is fixed to the bottom of the connecting frame, and in the process that the screening assembly rapidly descends through the separating mechanism, the step feet of the juvenile crabs are disengaged from the cross rods, and the situation that the step feet are clamped during juvenile crab screening is solved; the screening effect of the juvenile crabs is improved, redistribution of the juvenile crabs which cannot be screened on the cross rod is facilitated, the distribution uniformity of the juvenile crabs is improved, screening of the juvenile crabs is carried out in water, damage to the juvenile crabs during screening can be reduced through buffering of the water, and the survival rate of the juvenile crabs during follow-up culture is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aquaculture, and in particular to a crab seed screening device for aquaculture. Background Art

[0002] In the process of crab breeding, screening of crab seedlings is a key and necessary operation. The purpose is to classify the crab seedlings according to specifications so that the specifications of crab seedlings in the same pond are relatively consistent, reduce the probability of cannibalism, increase the survival rate of seedlings, and facilitate the breeding needs of crab seedlings of different specifications.

[0003] At present, crab seedlings are generally screened using sieves during crab farming. During screening, the slender and bent legs of the crab seedlings are easily stuck in the sieve holes, making it difficult for other crab seedlings to pass through the sieve holes smoothly. This situation not only reduces the screening efficiency of the crab seedlings, but also easily causes the legs of the crab seedlings to break during screening, affecting the crab seedlings' movement ability and feeding efficiency, and then reducing the survival rate of crab seedling farming. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the legs of crab seedlings are easily stuck in the sieve holes during crab seedling screening, which makes it difficult for other crab seedlings to pass through the sieve holes smoothly, reduces the screening efficiency of crab seedlings, and easily causes the legs of crab seedlings to break, and proposes a crab seedling screening device for aquaculture.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a crab seed screening device for aquaculture: comprising a box body filled with water, a screening assembly is arranged inside the box body, and a separation mechanism is also included, the separation mechanism comprises a motor fixedly installed on one side of the box body, the inner wall of the box body is rotatably connected with a lifting disk, a pull-back assembly is arranged inside the box body, the pull-back assembly comprises a connecting frame slidably connected to the inside of the box body, a spring telescopic rod is fixedly connected between the connecting frame and the box body, and a support rod is fixed at the bottom of the connecting frame;

[0006] The screening assembly comprises a bottom frame slidably connected to the top of the connecting frame, a cover body is fixedly connected to the top of the bottom frame, and a plurality of equidistantly arranged cross bars are arranged inside the bottom frame;

[0007] When the separation mechanism drives the cross bar to descend rapidly, the buoyancy and water flow thrust cause the crab seedlings' walking legs to separate from the cross bar gaps; when the cross bar rises, the water flow promotes the crab seedlings to pass through the cross bar gaps.

[0008] As a further description of the above technical solution: a connecting unit is provided at one end of the cross bar, and the connecting unit includes a rotating shaft fixed to the end of the connecting unit and rotatably connected to the bottom frame, a torsion spring is provided between the rotating shaft and the bottom frame, a limiting block is fixed on the rotating shaft, and the cross bar has an elliptical cross section and a notch is provided at the bottom.

[0009] As a further description of the above technical solution: It further includes an aeration mechanism, and the aeration mechanism includes a pump machine fixedly installed at the bottom of the box body. A connecting pipe is fixedly connected inside the bottom frame, and a hose is fixedly connected between the water outlet of the pump machine and the connecting pipe.

[0010] As a further description of the above technical solution: A trachea is fixedly connected inside the cross bar. One end of the trachea is rotatably connected to the connecting pipe, and the trachea is communicated with the connecting pipe. A spraying pipe penetrating the cross bar is fixed on the trachea.

[0011] As a further description of the above technical solution: It further includes a shaking structure, and the shaking structure includes a sliding groove opened on the inner wall of the box body. A sliding block embedded in the sliding groove is arranged outside the bottom frame.

[0012] As a further description of the above technical solution: The top of the sliding groove is inclined, and a push rod is fixedly connected to the inner wall of the box body.

[0013] As a further description of the above technical solution: A push block is slidably connected inside the bottom frame, and a compression spring is fixed between the push block and the sliding block.

[0014] As a further description of the above technical solution: A transmission unit is arranged between the motor and the jacking disc. The transmission unit includes synchronous wheels respectively fixed to the jacking disc and the driving shaft of the motor, and a synchronous belt is drivingly connected between adjacent synchronous wheels.

[0015] In summary, due to the adoption of the above technology in a crab seedling screening device for aquaculture, the beneficial effects of the present invention are:

[0016] In this application, the crab seedlings are screened by the equidistantly arranged cross bars. Compared with the traditional sieve mesh, the probability of the crab seedlings' walking legs being stuck during the screening process is reduced. Moreover, the surface of the cross bar is smooth, which helps the artificial assistance for the crab seedlings to move on the cross bar, improving the screening effect of the crab seedlings and preventing the situation of friction damage to the crab seedlings. Not only that, when the screening assembly rapidly descends through the separation mechanism, the crab seedlings are subjected to the buoyancy of water and the upward thrust of the water flow while being affected by the water buoyancy, so that the descending speed of the crab seedlings is less than that of the cross bar. Therefore, the crab seedlings can be separated from the cross bar, and the walking legs of the crab seedlings can be disengaged from between the cross bars. This design solves the problem of the walking legs of the crab seedlings being stuck during screening, improves the screening effect of the crab seedlings, helps the crab seedlings that cannot be screened on the cross bar to redistribute, improves the uniformity of the crab seedling distribution, and then speeds up the screening efficiency. Moreover, the screening of the crab seedlings is carried out in water, and the buffer of the water can reduce the damage suffered by the crab seedlings during screening, which helps to improve the survival rate of the crab seedlings in subsequent breeding;

[0017] When the cross bar is driven to rise by the separation mechanism, the water flow passes through the gaps between the cross bars from top to bottom, which helps to drive the crab seedlings to pass through between the cross bars, further accelerating the screening efficiency.

[0018] During the downward movement of the crossbar, the water flow impacts the notch at the bottom of the crossbar, causing the crossbar to deflect, thereby increasing the distance between adjacent crossbars. As a result, it is easier for the walking legs of the crab larvae to escape from between the crossbars, avoiding damage to the crab larvae and improving the breeding effect of the crab larvae.

[0019] The aeration mechanism can oxygenate the crab larvae in the box body and the screening assembly, reduce the stress reaction during crab larvae screening, reduce the screening difficulty of the crab larvae, and can extend the screening time. In addition, when the crossbar deflects, the air ejected from the ejection pipe can directly act on the gap between the crossbars. The air flow can help the trapped crab larvae escape from between the crossbars and prevent crab larvae from slipping through the sieve when the gap between the crossbars increases, making the specifications of the screened crab larvae more uniform.

[0020] The shaking structure can make the screening assembly shake left and right during the upward movement. By disturbing the water flow, the crab larvae are evenly distributed on the crossbar, avoiding the accumulation of crab larvae, accelerating the screening efficiency and avoiding damage to the crab larvae caused by accumulation. Description of the Drawings

[0021] Figure 1 Shows the overall schematic diagram provided according to an embodiment of the present invention;

[0022] Figure 2 Shows the schematic cross-sectional view of the box body provided according to an embodiment of the present invention;

[0023] Figure 3 Shows the Figure 2 Enlarged view at A in;

[0024] Figure 4 Shows the schematic cross-sectional view of the bottom frame provided according to an embodiment of the present invention;

[0025] Figure 5 Shows the Figure 4 Enlarged view at B in;

[0026] Figure 6 Shows the schematic diagram of the sliding groove provided according to an embodiment of the present invention;

[0027] Figure 7 Shows the schematic diagram of the connecting pipe provided according to an embodiment of the present invention;

[0028] Figure 8 Shows the Figure 7 Enlarged view at C in;

[0029] Figure 9 Shows the schematic diagram of the hose provided according to an embodiment of the present invention;

[0030] Figure 10Shows the one provided according to an embodiment of the present invention Figure 9 The enlarged view at position D in

[0031] Figure 11 Shows the schematic cross-sectional view of the crossbar provided according to an embodiment of the present invention.

[0032] Legend description:

[0033] 10. Box body;

[0034] 20. Screening assembly; 21. Bottom frame; 22. Cover body; 23. Crossbar; 24. Connecting unit; 241. Rotating shaft; 242. Torsion spring; 243. Limiting block;

[0035] 30. Separation mechanism; 31. Motor; 32. Transmission unit; 321. Synchronous pulley; 322. Synchronous belt; 33. Jacking disc; 34. Pull-back assembly; 341. Support rod; 342. Connecting frame; 343. Spring telescopic rod;

[0036] 40. Shaking structure; 41. Slide block; 42. Push rod; 43. Push block; 44. Compression spring; 45. Chute;

[0037] 50. Aeration mechanism; 51. Pump; 52. Hose; 53. Connecting pipe; 54. Air pipe; 55. Spraying pipe. Detailed implementation manners

[0038] Next, the technical solution of a crab seedling screening device for aquaculture in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] As Figures 1 - 11 shown, a crab seedling screening device for aquaculture provided by the present invention includes a box body 10 filled with water. One side of the box body 10 is provided with a drain port sealed by a sealing cover, and a screening assembly 20 is arranged inside the box body 10;

[0040] Referring to Figure 2 and Figure 3, further comprising a separating mechanism 30, the separating mechanism 30 includes a motor 31 fixedly installed on one side of the box body 10, both inner walls on both sides of the box body 10 are rotatably connected with lifting disks 33, a pulling-back assembly 34 is arranged inside the box body 10, the pulling-back assembly 34 includes a connecting frame 342 slidably connected inside the box body 10, a spring telescopic rod 343 is fixedly connected between the connecting frame 342 and the box body 10, bottom parts on both sides of the connecting frame 342 are respectively fixed with support rods 341, the two support rods 341 are respectively located above the two lifting disks 33 and are supported by the lifting disks 33, the lifting disks 33 push the support rods 341 upward by rotation, driving the connecting frame 342 to slowly rise, and the spring telescopic rod 343 is stretched. After the support rods 341 and the connecting frame 342 are lifted to the highest position, the lifting disks 33 continue to rotate to make the support rods 341 coincide with the concave parts of the lifting disks 33. At this time, the lifting disks 33 no longer support the support rods 341, and the contraction elastic force of the spring telescopic rod 343 drives the connecting frame 342 and the support rods 341 to quickly descend and reset;

[0041] By arranging the two lifting disks 33 and the support rods 341, the connecting frame 342 can be smoothly lifted. In order to ensure the synchronous rotation of the two lifting disks 33, a transmission unit 32 is arranged between the motor 31 and the lifting disks 33. The transmission unit 32 includes synchronous pulleys 321 respectively fixed to the driving shafts of the lifting disks 33 and the motor 31. The opposite sides of the two lifting disks 33 are respectively fixed with synchronous pulleys 321 through round rods penetrating the box body 10. Two synchronous pulleys 321 are also fixed on the driving shaft of the motor 31. Synchronous belts 322 are connected between adjacent synchronous pulleys 321. After the motor 31 is started, it drives the two synchronous pulleys 321 fixed to its driving shaft to rotate. Through the transmission of the synchronous belts 322 and the other synchronous pulleys 321, the two lifting disks 33 are driven to rotate synchronously, so that the two lifting disks 33 can smoothly lift the two support rods 341 upward.

[0042] Referring to Figure 1 , the screening assembly 20 includes a bottom frame 21 slidably connected to the top of the connecting frame 342, a cover body 22 is fixedly connected to the top of the bottom frame 21, a plurality of cross bars 23 arranged at equal intervals are arranged inside the bottom frame 21, and the cover body 22 covers above the bottom frame 21 to prevent the crab seedlings poured onto the cross bars 23 from escaping from the edge of the bottom frame 21;

[0043] The lifting of the connecting frame 342 will drive the bottom frame 21 and the cross bar 23 to lift together. The water level requirement inside the box body 10 is that when the cross bar 23 rises to the maximum height, the crab seedlings on the cross bar 23 can still be completely submerged. When the connecting frame 342 quickly descends and resets, it drives the cross bar 23 to move downward. At this time, the water below the bottom frame 21 will flow relative to the cross bar 23. At the same time, the crab seedlings will also be affected by the buoyancy of the water. Therefore, the descending speed of the crab seedlings is less than that of the cross bar 23 at this time, and the crab seedlings will separate from the cross bar 23, so that the walking legs of the crab seedlings can escape from between the cross bars 23, avoiding the walking legs of the crab seedlings being stuck between the cross bars 23, improving the screening effect of the crab seedlings, and the crab seedlings suspended in the water will also be evenly distributed under the push of the water flow, avoiding the accumulation of crab seedlings;

[0044] After the cross bar 23 falls to the lowest point, the crab seedlings gradually fall onto the cross bar 23 under the action of gravity. When the connecting frame 342 drives the cross bar 23 to rise, the water flow passing through between the cross bars 23 flows downward relative to the cross bar 23. At this time, the crab seedlings will be subject to a downward thrust from the water flow to promote the crab seedlings to pass through the gap between the cross bars 23 and accelerate the screening. It should be noted that the rising speed of the cross bar 23 depends on the rotation speed of the jacking plate 33. By slowly rising the cross bar 23, it is possible to avoid damage to the crab seedlings caused by excessive water flow thrust.

[0045] Refer to Figure 7 and Figure 8 In order to further reduce the probability of damage to the walking legs when the walking legs of the crab seedlings escape from the gap between the cross bars 23, a connecting unit 24 is provided at one end of the cross bar 23. The connecting unit 24 includes a rotating shaft 241 fixed to the end of the connecting unit 24 and rotatably connected to the bottom frame 21. A torsion spring 242 is provided between the rotating shaft 241 and the bottom frame 21. A limiting block 243 is fixed on the rotating shaft 241. A limiting groove is formed inside the bottom frame 21. The rotation angle of the rotating shaft 241 and the cross bar 23 is limited by the limiting block 243 and the limiting groove. The maximum rotation angle of the cross bar 23 is ninety degrees. The torsion spring 242 is always in a tightened state, so that the limiting block 243 contacts the inner wall of the limiting groove and there is an extrusion force between the two, avoiding the random rotation of the cross bar 23.

[0046] The cross section of the cross bar 23 is elliptical and there is a notch at the bottom. When the bottom frame 21 quickly moves downward and drives the cross bar 23 to move downward, the water flow thrust received by the side where the notch is located is greater than that of the other side. Therefore, the cross bar 23 deflects under the action of the water flow thrust. When the cross bar 23 deflects from the horizontal state to the vertical state, the distance between adjacent cross bars 23 will increase, so that the walking legs of the crab seedlings embedded between the cross bars 23 can smoothly escape, reducing the possibility of collision between the walking legs and the cross bar 23, and thus avoiding damage to the crab seedlings.

[0047] Refer to Figure 4 、 Figure 7 and Figure 11, To avoid oxygen deficiency stress of crab seedlings and extend the screening time, an aeration mechanism 50 is further included. The aeration mechanism 50 includes a pump 51 fixedly installed at the bottom of the box body 10. A connecting pipe 53 is fixedly connected inside the bottom frame 21. A hose 52 is fixedly connected between the water outlet of the pump 51 and the connecting pipe 53. An air pipe 54 is fixedly connected inside the cross bar 23. One end of the air pipe 54 is rotatably connected to the connecting pipe 53, and the air pipe 54 communicates with the connecting pipe 53. A number of spray pipes 55 penetrating the cross bar 23 are fixedly arranged on the air pipe 54 at equal intervals. Starting the pump 51 can transport external oxygen to the spray pipes 55 through the hose 52, the connecting pipe 53 and the air pipe 54 for spraying to supply oxygen to the crab seedlings;

[0048] The air outlet end of the spray pipe 55 is located in the notch of the cross bar 23 and is equipped with a check valve to prevent water backflow. The air outlet end of the spray pipe 55 is arranged downward to prevent impurities in the water from accumulating at the air outlet end of the spray pipe 55 and causing blockage when the aeration stops. And when the bottom frame 21 moves downward and the cross bar 23 deflects, the spray pipe 55 faces the gap between the cross bars 23. The sprayed air can also give the crab seedlings an upward thrust to assist the crab seedlings' walking legs to escape from the gap between the cross bars 23 and prevent crab seedlings from leaking through the sieve when the distance between the cross bars 23 increases.

[0049] Refer to Figure 4 、 Figure 5 and Figure 6 , To promote the uniform distribution of crab seedlings, avoid damage to crab seedlings caused by local accumulation during screening, and improve the screening efficiency, a shaking structure 40 is further included. The shaking structure 40 includes a sliding groove 45 opened on the inner wall of the box body 10. A sliding block 41 embedded in the sliding groove 45 is arranged on the outside of the bottom frame 21. During the upward movement of the bottom frame 21, the sliding block 41 reciprocates horizontally under the guidance of the sliding groove 45, driving the bottom frame 21 and the cross bar 23 to reciprocate and disturbing the water flow, so that the crab seedlings on the cross bar 23 are evenly distributed for screening.

[0050] The top of the sliding groove 45 is inclined. A push rod 42 with a sloping top is fixedly connected to the inner wall of the box body 10. When the bottom frame 21 moves upward until it is reset, the inclined surface of the sliding groove 45 pushes the sliding block 41 into the inside of the bottom frame 21, so that the sliding block 41 disengages from the sliding groove 45, preventing the bottom frame 21 from shaking when it moves downward and avoiding affecting the rapid descent speed of the bottom frame 21. And when the bottom frame 21 and the cross bar 23 move upward and shake, the shaking speed can be controlled by controlling the upward movement speed of the bottom frame 21 and the cross bar 23 to avoid excessive shaking and causing harm to the crab seedlings;

[0051] A push block 43 is slidably connected inside the bottom frame 21. A compression spring 44 is fixed between the push block 43 and the slider 41. When the bottom frame 21 descends, the push rod 42 pushes the push block 43 to drive the compression spring 44 and the slider 41 to move towards the sliding groove 45. When the slider 41 is not aligned with the sliding groove 45, the movement of the push block 43 compresses the compression spring 44. At this time, the slider 41 is subjected to the elastic force of the compression spring 44. After the slider 41 is aligned with the sliding groove 45, the slider 41 enters the inside of the sliding groove 45 under the elastic force of the compression spring 44. This design is used to prevent the slider 41 and the bottom frame 21 from jamming during movement and make the width of the slider 41 more compatible with the sliding groove 45, reducing the collision between the slider 41 and the inner wall of the sliding groove 45 when the slider 41 slides in the sliding groove 45.

[0052] Working principle: In the initial state, the bottom frame 21, the cross bar 23 and the connecting frame 342 are at the highest position. The spring telescopic rod 343 is in a stretched state. The crab seedlings are poured into the cover body 22 so that the crab seedlings are laid flat on the cross bar 23. At this time, the crab seedlings are completely immersed in the water inside the box body 10, and the slider 41 is not embedded in the sliding groove 45.

[0053] Start the pump 51 to deliver the external oxygen through the hose 52, the connecting pipe 53 and the air pipe 54 to the spray pipe 55 for spraying to supply oxygen to the crab seedlings.

[0054] Start the motor 31 to drive the synchronous pulley 321 fixed to its drive shaft to rotate. Through the synchronous belt 322 and the synchronous pulley 321 fixed to the jacking disc 33, the two jacking discs 33 are driven to rotate synchronously, so that the concave part of the jacking disc 33 deflects to the due upper position. At this time, the jacking disc 33 no longer supports the support rod 341, and the connecting frame 342 and the support rod 341 quickly move downward under the contraction elastic force of the spring telescopic rod 343.

[0055] The rapid descent of the connecting frame 342 drives the bottom frame 21 and the cross bar 23 to move downward. At this time, the water below the cross bar 23 flows upward relative to the cross bar 23. At the same time, the crab seedlings will also be subjected to the buoyancy of the water. Therefore, the descending speed of the crab seedlings is less than that of the cross bar 23 at this time, and the crab seedlings will separate from the cross bar 23, so that the crab seedling legs can be disengaged from between the cross bars 23, avoiding the crab seedling legs being stuck between the cross bars 23.

[0056] When the bottom frame 21 quickly moves downward to drive the cross bar 23 to move downward, the water flow thrust received by one side of the cross bar 23 where the notch is located is greater than the other side. Therefore, the cross bar 23 deflects under the water flow thrust, causing the cross bar 23 to deflect from the horizontal state to the vertical state, and the distance between adjacent cross bars 23 increases, so that the legs of the crab seedlings embedded between the cross bars 23 can be smoothly disengaged, reducing the possibility of the legs colliding with the cross bar 23, thereby avoiding damage to the crab seedlings.

[0057] The deflection of the cross bar 23 causes the air outlet end of the air spraying pipe 55 to face the direction of the gap between the cross bars 23. The air sprayed from the air spraying pipe 55 exerts an upward force on the crab seedlings, assisting the walking legs of the crab seedlings to escape from the gap between the cross bars 23 and preventing the crab seedlings from leaking through the sieve when the distance between the cross bars 23 increases.

[0058] After the bottom frame 21 descends to the height where the push rod 42 is located, the push rod 42 pushes the push block 43 to drive the compression spring 44 and the slider 41 to move towards the sliding groove 45. When the slider 41 is not aligned with the sliding groove 45, the movement of the push block 43 compresses the compression spring 44. At this time, the slider 41 is subjected to the elastic force of the compression spring 44. After the slider 41 is aligned with the sliding groove 45, the slider 41 enters the inside of the sliding groove 45 under the elastic force of the compression spring 44. When the lifting disc 33 continues to rotate to lift the support rod 341, the connecting frame 342, the bottom frame 21 and the cover body 22 upwards, the slider 41 reciprocates horizontally under the guidance of the sliding groove 45, driving the bottom frame 21 and the cross bar 23 to reciprocate and disturbing the water flow, so that the crab seedlings on the cross bar 23 are evenly distributed.

[0059] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A crab seedling screening device for aquaculture, comprising a box body (10) filled with water, wherein a screening assembly (20) is arranged inside the box body (10), and it is characterized in that, The device also comprises a separation mechanism (30), the separation mechanism (30) comprising a motor (31) fixedly mounted on one side of the box body (10), the inner wall of the box body (10) being rotatably connected to a lifting plate (33), a retraction assembly (34) being arranged inside the box body (10), the retraction assembly (34) comprising a connection frame (342) slidably connected to the inside of the box body (10), a spring telescopic rod (343) being fixedly connected between the connection frame (342) and the box body (10), and a support rod (341) being fixed at the bottom of the connection frame (342); The screening assembly (20) comprises a bottom frame (21) slidably connected to the top of the connecting frame (342), a cover body (22) is fixedly connected to the top of the bottom frame (21), and a plurality of equidistantly arranged cross bars (23) are arranged inside the bottom frame (21); When the separation mechanism (30) drives the cross bar (23) to descend rapidly, the buoyancy and the thrust of the water flow cause the crab fry's walking legs to separate from the gap of the cross bar (23); when the cross bar (23) rises, the water flow promotes the crab fry to pass through the gap of the cross bar (23).

2. The crab seedling screening device for aquaculture according to claim 1, characterized in that, A connecting unit (24) is provided at one end of the cross bar (23), the connecting unit (24) comprising a rotating shaft (241) fixed to the end of the connecting unit (24) and rotatably connected to the bottom frame (21), a torsion spring (242) is provided between the rotating shaft (241) and the bottom frame (21), a limiting block (243) is fixed on the rotating shaft (241), and the cross bar (23) has an elliptical cross section and a notch is provided at the bottom.

3. The crab seedling screening device for aquaculture according to claim 1, characterized in that, It also comprises an aeration mechanism (50), the aeration mechanism (50) comprising a pump (51) fixedly mounted on the bottom of the box body (10), a connecting pipe (53) fixedly connected to the interior of the bottom frame (21), and a hose (52) fixedly connected between the water outlet of the pump (51) and the connecting pipe (53).

4. The crab seedling screening device for aquaculture according to claim 3, wherein, An air pipe (54) is fixedly connected inside the cross bar (23), one end of the air pipe (54) is rotatably connected to the connecting pipe (53), and the air pipe (54) is communicated with the connecting pipe (53). An ejection pipe (55) penetrating the cross bar (23) is fixed on the air pipe (54).

5. The crab seedling screening device for aquaculture according to claim 1, characterized in that, It also includes a shaking structure (40), the shaking structure (40) including a slide groove (45) opened on the inner wall of the box body (10), and a sliding block (41) embedded in the slide groove (45) is arranged on the outer side of the bottom frame (21).

6. The crab seedling screening device for aquaculture according to claim 5, characterized in that, The top of the slide groove (45) is inclined, and a push rod (42) is fixedly connected to the inner wall of the box body (10).

7. The crab seedling screening device for aquaculture according to claim 6, characterized in that, A push block (43) is slidably connected inside the bottom frame (21), and a compression spring (44) is fixed between the push block (43) and the sliding block (41).

8. The crab seedling screening device for aquaculture according to claim 1, characterized in that, A transmission unit (32) is provided between the motor (31) and the lifting disk (33), and the transmission unit (32) comprises synchronous wheels (321) respectively fixed to the lifting disk (33) and the driving shaft of the motor (31), and a synchronous belt (322) is provided between adjacent synchronous wheels (321) for transmission connection.

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