A fry grading and sorting device

Abstract

The present application relates to the field of fry screening equipment, and particularly relates to a fry grading and screening device, which comprises a frame body and a grading and screening assembly. The frame body is arranged obliquely, and the grading and screening assembly comprises multiple levels of screening structures arranged side by side along the arrangement direction of the frame body. Each level of the screening structures comprises a screen net and a fish collecting pipe. The grading roller protrusions on the screen net form fish blocking structures, which make the fry jump vertically to the screen net. Through the arrangement of the fish blocking structures, when the fry moves downward under the action of gravity, the fish blocking structures block the fry. The fry jumps upward along the fish blocking structures vertically to the screen net under the action of inertia, and then falls down, so that the orientation of the fry is adjusted, and then the orientation of the fry with a size smaller than the spacing of the grading roller of the screen net of this level is rotated to be consistent with the grading roller, so that the fry which does not meet the size of the fry corresponding to the screen net of this level can fall down from the spacing of the grading roller to the screen net of the next level, thereby improving the grading and screening efficiency.

Description

Technical Field

[0001] This invention relates to the field of fish fry screening equipment, specifically to a fish fry grading and screening device. Background Technology

[0002] In aquaculture, especially in fish fry rearing, it is necessary to grade and screen fish fry according to their different growth sizes to optimize stocking density, promote growth, and facilitate management. Traditional manual screening methods are inefficient, labor-intensive, and prone to causing physical damage to the fish fry. Therefore, mechanical screening methods are often used. Existing fish fry grading and screening devices generally include multiple screens with progressively decreasing spacing. Fish fry are placed on the screens and pass through them sequentially. Fish fry that meet the size requirements of the screen spacing remain on that screen, while those that do not meet the size requirements fall through the gaps to the next screen, and this process is repeated to grade and screen the fish fry.

[0003] However, existing fish fry grading and screening devices have a random orientation of fish fry on the screen. The orientation of the fish fry (i.e., the body length direction) may not be parallel to the gap of the screen. This means that even if the size of the fish fry (generally referring to the body width of the fish fry) does not meet the requirement of being smaller than the gap size of the screen for that grade, the fish fry will not be able to fall through the gap of the screen, resulting in mis-screening or missed screening, and reducing the grading and screening efficiency. Summary of the Invention

[0004] The technical solution adopted by this invention to solve its technical problem is: to provide a fish fry grading and screening device, comprising:

[0005] The frame is inclined and has a fish inlet connected to the outside and a discharge pipe for drainage. The frame is inclined along the direction from the fish inlet to the discharge pipe, and the height of the fish inlet is higher than the height of the discharge pipe.

[0006] A grading and screening component includes multiple screening structures arranged in parallel on a frame. Each screening structure includes a fish screen and a fish collection tube located on the end of the fish screen away from the fish inlet. The fish screens of each screening structure are interconnected. The grading rollers on the fish screen form a fish-blocking structure, which causes fish fry to jump perpendicular to the fish screen. Each fish screen includes multiple grading rollers arranged in parallel. The spacing between the grading rollers of the multiple screening structures decreases progressively along the frame. The spacing between the grading rollers of the screening structure closer to the fish inlet is greater than the spacing between the grading rollers of the screening structure farther from the fish inlet. Fish fry of a corresponding size enter the corresponding fish collection tube through the corresponding fish screen and exit. When the size is smaller than the size of the fish fry corresponding to the screening structure of that level, the fish fry fall into the fish screen of the next level screening structure through the gap between the grading rollers.

[0007] Furthermore, each of the fish sieves is inclined, with the end of the fish sieve closest to the fish inlet at a higher height than the end of the fish sieve furthest from the fish inlet.

[0008] Furthermore, the fish collection pipe is equipped with a fish conveying channel and a baffle. The fish conveying channel is connected to the end of the same level fish screen that is away from the fish inlet. The baffle is used to limit the movement of the fish fry.

[0009] Furthermore, the fish collecting pipe is also provided with a lower limit plate, and the frame is provided with an inclined mounting plate. The mounting plate is provided with multiple mounting grooves corresponding to each stage of the fish screen, and the two ends of the fish screen are respectively placed on the corresponding lower limit plate and mounting groove.

[0010] Furthermore, each stage of the screening structure also includes multiple nozzles mounted on the mounting plate and a guide plate mounted on the fish screen. The nozzles are positioned toward the guide plate, which is located at the fish-blocking structure. The guide plate has interval grooves corresponding to the grading rollers, and the water flow direction from the nozzles is the same as the direction of the central axis of the grading rollers.

[0011] Furthermore, the guide plate is an arc-shaped plate.

[0012] Furthermore, the center point of the arc-shaped trajectory of the guide plate is on the central axis of the fish-blocking structure along the width direction of the screen net, and the center point of the arc-shaped trajectory on the guide plate is farther away from the fish inlet than the fish-blocking structure.

[0013] Furthermore, the frame is also provided with a second fish inlet that is connected to the fish suction pump, and a guide cover is provided at the second fish inlet.

[0014] Furthermore, the frame is equipped with a water spray pipe, which is connected to a centrifugal pump. The water spray pipe is positioned towards the fish screen net, and the centrifugal pump is used to provide water pressure.

[0015] Furthermore, it also includes a vibration assembly. The bottom of the frame is connected to a support frame. The vibration assembly includes a vibration motor and a buffer spring. The vibration motor is mounted on the support frame and is used to generate vibration. A support rod is provided at the connection between the support frame and the frame, and the buffer spring is sleeved on the support rod.

[0016] The beneficial effects of this invention are as follows: By setting up the fish-blocking structure, when the fish fry move downward along the fish screen under the action of gravity, the fish-blocking structure blocks the fish fry. Under the action of inertia, the fish fry jump upward along the fish-blocking structure perpendicular to the fish screen and then fall down, thereby adjusting the orientation of the fish fry. This allows the orientation of fish fry smaller than the spacing between the grading rollers of the fish screen to be aligned with the grading rollers, so that fish fry that do not meet the size requirements of the fish screen corresponding to the current grade can fall from the gap between the grading rollers to the next grade of the fish screen, thereby improving the grading and screening efficiency. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] In the picture: Figure 1 This is an overall structural diagram of a fish fry grading and screening device provided by the present invention;

[0019] Figure 2 for Figure 1 The three-dimensional structural diagram of the fish fry grading and screening device shown from another perspective;

[0020] Figure 3 for Figure 1 A cross-sectional view of the fish fry grading and screening device shown;

[0021] Figure 4 for Figure 1 The diagram shows the three-dimensional structure of the fish fry grading and screening device after the hidden part of the frame is shown.

[0022] Figure 5 for Figure 1 The diagram shows a three-dimensional structural representation of the part shown.

[0023] Explanation of reference numerals in the attached drawings: 10. Frame; 11. Fish inlet 1; 12. Mounting plate; 121. Mounting groove; 13. Fish inlet 2; 131. Guide cover; 132. Connector; 14. Water spray pipe; 141. Centrifugal pump; 15. Support frame; 151. Roller; 16. Discharge pipe; 21. Fish screen; 211. Grading roller; 212. Fish blocking structure; 22. Fish collecting pipe; 221. Fish conveying channel; 222. Baffle; 223. Lower limit plate; 23. Nozzle; 24. Guide plate; 241. Spacing groove; 31. Vibration motor; 32. Buffer spring. Detailed Implementation

[0024] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the invention, and therefore only shows the components relevant to the invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] Please refer to Figure 1 and Figure 2 This invention provides a fish fry grading and screening device, including a frame 10 and grading and screening components. The frame 10 is provided with a fish inlet 11 communicating with the outside and a fish inlet 13 communicating with a fish suction pump. When fish fry are put in, they can be manually put in through the fish inlet 11 or put in through the fish inlet 13 powered by the fish suction pump. The lowest end of the frame 10 is provided with a discharge pipe 16 for drainage. The frame 10 is inclined along the direction from the fish inlet 11 to the discharge pipe 16, and the height of both the fish inlet 11 and the fish inlet 13 is higher than the height of the discharge pipe 16.

[0026] Please refer to Figure 3 and Figure 4 The grading and screening component includes multiple screening structures arranged in parallel along the direction of the frame 10. Each screening structure includes a fish-screening net 21 and a fish-collecting tube 22 located on the end of the fish-screening net 21 away from the fish inlet 11. The fish-screening nets 21 of each screening structure are interconnected. Each fish-screening net 21 includes multiple grading rollers 211 arranged in parallel. The spacing between the grading rollers 211 of the multi-level screening structure decreases progressively along the direction of the frame 10, and the spacing between the grading rollers 211 of the screening structure closer to the fish inlet 11 is greater than the spacing between the grading rollers 211 of the screening structure farther from the fish inlet 11. Specifically, the number of screening structures can be adjusted according to the number of fish fry.

[0027] Please refer to Figure 4 and Figure 5The fish collection pipe 22 is equipped with a fish conveying channel 221 and a baffle 222. The fish conveying channel 221 is connected to the end of the same level fish screen 21 away from the fish inlet 11. The baffle 222 is used to limit the movement of the fish fry. Specifically, the fish conveying channel 221 is set along the width direction of the frame 10. The fish conveying channel 221 has a cylindrical cavity structure. The middle part of the fish conveying channel 221 has an opening that communicates with the fish screen 21, and the opening is closer to the fish screen 21 than the baffle 222. The baffle 222 is connected to the middle of the fish conveying channel 221, and the projected area of ​​the baffle 222 on the fish screen 21 can cover the projected area of ​​the fish conveying channel 221 on the fish screen 21. The upper end of the baffle 222 is higher than the top of the fish conveying channel 221, so as to cover the trajectory of the fish fry entering the fish conveying channel 221, thereby limiting the fish fry that meet the specifications of the fish screen 21 and are about to enter the corresponding fish conveying channel 221, preventing the fish fry from moving to the next level fish screen 21 under the action of gravity and crossing the fish conveying channel 221.

[0028] For further details, please refer to Figure 3 Each fish sieve 21 is set at an angle, with the end of the fish sieve 21 closer to the fish inlet 11 at a higher height than the end of the fish sieve 21 farther from the fish inlet 11, thereby further facilitating the movement of fish fry through multiple fish sieve 21 under the action of gravity.

[0029] During grading and screening, fish fry enter the frame 10 through either fish inlet 11 or fish inlet 13. Under the influence of gravity, they pass through multiple screening structures in sequence. When on the fish screen 21 corresponding to each screening structure, if the size of the fish fry is larger than the spacing of the grading rollers 211 of that level of fish screen 21, then it meets the fish fry size requirements corresponding to that level of fish screen 21 and is output into the corresponding fish conveying channel 221 through that level of fish screen 21. If the size is smaller than the spacing of the grading rollers 211 of that level of fish screen 21, then it does not meet the fish fry size requirements corresponding to that level of fish screen 21 and falls from the gaps of the grading rollers 211 to the fish screen 21 of the next level of screening structure for the next level of screening.

[0030] Through multiple fish sieves 21 with gradually decreasing heights set at an incline, fish fry pass through the multi-stage screening structure in sequence under the action of gravity. The size of the fish fry is then screened by grading rollers 211 with gradually decreasing spacing. Finally, fish fry of the corresponding size are retained on the corresponding fish sieve 21 and enter the corresponding fish conveying channel 221 for output.

[0031] Please refer to Figure 3 and Figure 5To facilitate the replacement of the fish sieve net 21 and to ensure that fish fry falling from the fish sieve net 21 can smoothly fall onto the fish sieve net 21 of the next stage of the screening structure, each stage of the fish collection pipe 22 is also equipped with a lower limit plate 223. The frame 10 is equipped with an inclined mounting plate 12, which has multiple mounting grooves 121 corresponding to each stage of the fish sieve net 21. The two ends of the fish sieve net 21 are placed on the corresponding lower limit plate 223 and mounting grooves 121, respectively. When replacing the fish sieve net 21, it is only necessary to remove the fish sieve net 21 from the corresponding lower limit plate 223 and mounting grooves 121. When the fish fry fall because their size is smaller than the spacing of the grading rollers 211 of a certain stage of the fish sieve net 21, they will fall onto the mounting plate 12 and move downwards along the inclined mounting plate 12 until they fall onto the fish sieve net 21 of the next stage along the mounting grooves 121.

[0032] The grading rollers 211 on the fish sieve 21 have protrusions that form a fish-blocking structure 212, which causes the fish fry to jump perpendicular to the fish sieve 21. For details, please refer to... Figure 3 and Figure 5 The fish-blocking structure 212 is a triangular protrusion located in the middle of the length of the fish screen 21, and the tip of the fish-blocking structure 212 is perpendicular to the axial direction of the grading roller 211 and is set upward.

[0033] By setting up the fish-blocking structure 212, when the fish fry move downward along the fish screen 21 under the action of gravity, the fish-blocking structure 212 blocks the fish fry. Under the action of inertia, the fish fry jump upward along the fish-blocking structure 212 perpendicular to the fish screen 21 and then fall down, so that the orientation of the fish fry is adjusted. This allows the orientation of fish fry whose size is smaller than the spacing of the grading rollers 211 of the fish screen 21 to be consistent with the grading rollers 211, so that fish fry that do not meet the fish fry size corresponding to the fish screen 21 of the current level can fall from the gap of the grading rollers 211 to the next level of fish screen 21, thereby improving the grading and screening efficiency.

[0034] Please refer to Figure 4 and Figure 5 Each screening structure also includes multiple nozzles 23 mounted on the mounting plate 12 and a guide plate 24 mounted on the fish screen 21. The nozzles 23 are positioned facing the guide plate 24, which is located at the fish-blocking structure 212. The guide plate 24 has interval grooves 241 corresponding to the grading roller 211. The water flow direction of the nozzles 23 is the same as the central axis direction of the grading roller 211, and the water flow is redirected on the guide plate 24. Specifically, the multiple nozzles 23 are arranged side by side along the width direction of the fish screen 21, and the height of the guide plate 24 in the direction perpendicular to the central axis of the grading roller 211 is lower than or equal to the height of the fish-blocking structure 212 in that direction.

[0035] After the water flow is sprayed from the nozzle 23, it initially redirects the fish fry on the sieve net 21. Some fry are rotated by the water flow to align with the central axis of the grading rollers 211, so that fry smaller than the spacing between the grading rollers 211 can fall from the gaps between the grading rollers 211 onto the mounting plate 12 and then fall onto the next tier of sieve net 21 under gravity. At this point, the fish fry remaining on the sieve net 21 include two types: those larger than the spacing between the grading rollers 211 and those smaller than the spacing but still oriented perpendicular to the grading rollers 211.

[0036] The guide plate 24 and the fish-blocking structure 212 work together to form a "barrier structure" for the water flow. After the water flow comes into contact with the "barrier structure", the direction of the water flow changes abruptly and turns at the guide plate 24. The orientation of the fish fry also turns along with the water flow, so that the orientation of the fish fry with a size smaller than the spacing of the grading rollers 211 of the fish screen net 21 can be rotated again. When the fish fry rotates to be parallel to the length direction of the grading rollers 211 of the fish screen net 21, they fall from the gap onto the mounting plate 12.

[0037] With the nozzle 23 and the guide plate 24 in place, before some fish fry jump and turn under the action of the fish blocking structure 212, the water flow initially turns the fish fry, so that some fish fry that do not meet the size requirements are rotated under the action of the water flow until they are parallel to the length direction of the grading roller 211 of the fish screen 21 and fall from the gap onto the mounting plate 12.

[0038] Meanwhile, the combination of the guide plate 24 and the fish-blocking structure 212 allows the water flow to continue turning fish fry that do not meet the size requirements, increasing the possibility of fish fry turning and further reducing the situation of misscreening caused by the fish fry's orientation not being in line with the central axis of the grading roller 211.

[0039] For further details, please refer to Figure 5 The guide plate 24 is an arc-shaped plate. Because the water flow direction abruptly changes at the guide plate 24 after being ejected from the nozzle 23, the outer velocity increases sharply while the inner side easily forms a backflow zone, resulting in strong turbulence and flow separation, generating high energy dissipation and easily causing damage to fish fry from the high-speed water flow. By making the guide plate 24 an arc-shaped plate, the water flow at the guide plate 24 gradually changes direction, the velocity distribution is more gentle, the intensity of turbulence and the range of the separation zone are reduced, and the flow velocity is lowered, thereby reducing damage to the fish fry.

[0040] Specifically, the center point of the arc-shaped trajectory of the guide plate 24 is on the central axis of the fish blocking structure 212 along the width direction of the fish screen 21, and the center point of the arc-shaped trajectory on the guide plate 24 is farther away from the fish inlet than the fish blocking structure 212.

[0041] When fish fry enter the fish screen 21 from fish inlet 11 or fish inlet 23, the speed of the fish fry on the fish screen 21 is too fast due to the power of the fish suction pump or the excessive height of the fish fry when they are manually placed. This causes the fish fry to jump along the fish barrier 212 when they come into contact with it, and they may also collide with the fish barrier 212 due to excessive speed, resulting in damage to the fish fry. The guide plate 24 is set up to share some of the turning work of the fish fry, reducing the situation of fish fry being damaged due to collision with the fish barrier 212 due to excessive speed.

[0042] Meanwhile, since multiple nozzles 23 are arranged side-by-side along the width of the fish screen 21, after the water flow is sprayed from the nozzles 23, the center point of the arc-shaped sidewall of the guide plate 24, which is arranged in an arc shape, is farthest from the nozzles 23. Consequently, the water flow experiences reduced energy upon reaching the guide plate 24, thus reducing the driving force on the fish fry. The water flow near the center of the guide plate 24 is insufficient to turn the fish fry along with it. Because the center point of the arc-shaped trajectory on the guide plate 24 is farther from the fish inlet 11 than the fish-blocking structure 212, the fish fry near the center of the guide plate 24 first contact the fish-blocking structure 212 and then jump vertically upwards along the fish-blocking structure 212 to turn.

[0043] Therefore, the design of the guide plate 24 reduces the possibility of damage to the fish fry due to excessive speed of some fish fry colliding with the fish-blocking structure 212. At the same time, the fish-blocking structure 212 also compensates for the insufficient central water flow dynamics caused by the arc-shaped structure on the guide plate 24.

[0044] Please refer to Figure 3 A guide cover 131 is provided at the fish inlet 13. Specifically, the upper end of the guide cover 131 extends through the fish inlet 13 and is located inside the frame 10. The inner wall of the upper end of the guide cover 131 has an arc-shaped structure, and the inner wall of the upper end of the guide cover 131 is bent towards the fish screen 21, so that the opening at the upper end of the guide cover 131 faces the fish screen 21. The lower end of the guide cover 131 extends through the fish inlet 13 and is connected to a connector 132, which has a 45° bend design.

[0045] By using the guide cover 131, the arc-shaped inner wall guides the fish fry sucked in from the second fish inlet 13 smoothly into the fish screen 21, instead of them jumping out of the second fish inlet 13 and falling into the fish screen 21. This reduces the damage to the fish fry during the process of being sucked into the fish screen 21 inside the frame 10 through the second fish inlet 13. At the same time, it constrains the direction of the water flow sucked in with the fish fry, causing the water flow to slow down slowly within the guide cover 131, preventing the fish fry from overflowing due to excessive water pressure.

[0046] Please refer to Figure 1 and Figure 2The frame 10 is equipped with a water spray pipe 14, which is connected to a centrifugal pump 141. The water spray pipe 14 is positioned towards the fish screen 21, and the centrifugal pump 141 provides water pressure. Specifically, the water spray pipe 14 is located above the frame 10, and multiple water spray pipes 14 are arranged side by side along the width of the frame 10. The water spray pipe 14 and the centrifugal pump 141 are connected by a pipe, which is not shown in the figure.

[0047] A centrifugal pump 141 provides stable water pressure, causing water to be evenly sprayed out through multiple spray pipes 14. Due to gravity, as the fish fry are sieved through multiple fish screens 21, the water flows downwards along the screens 21, causing the fish fry to lack water during the sieving process. The spray pipes 14 can continuously supply water during the sieving process, moisturizing and lubricating the fish fry, facilitating their movement, and effectively reducing surface damage caused by friction between the fish screens 21 and the fish fry, as well as stress on the fish fry, thus helping to improve the survival rate of the fish fry during the sieving process.

[0048] The fish fry grading and screening device also includes a vibration component. The bottom of the frame 10 is connected to a support frame 15. The vibration component includes a vibration motor 31 and a buffer spring 32. The vibration motor 31 is mounted on the support frame 15 and is used to generate vibration. A support rod is provided at the connection between the support frame 15 and the frame 10, and the buffer spring 32 is sleeved on the support rod.

[0049] The vibrating motor 31 provides continuous and uniform reciprocating vibration to the fish sieve net 21. This vibration effectively improves the distribution of fish fry on the fish sieve net 21, thereby enhancing the separation effect of fish fry of different sizes during the screening process and improving the overall efficiency and consistency of the grading operation. At the same time, the buffer spring 32 absorbs some of the vibration energy, preventing the fish sieve net 21 from vibrating too much and affecting the screening and grading process.

[0050] Meanwhile, in order to facilitate the movement of the entire fish fry grading and screening device, the support frame 15 is equipped with multiple rollers 151.

Claims

1. A fish fry grading and screening device, characterized in that, include: The frame is inclined and has a fish inlet connected to the outside and a discharge pipe for drainage. The frame is inclined along the direction from the fish inlet to the discharge pipe, and the height of the fish inlet is higher than the height of the discharge pipe. A grading and screening component includes multiple screening structures arranged in parallel along the frame. Each screening structure includes a fish screen and a fish collection tube located on the end of the fish screen away from the fish inlet. The fish screens of each screening structure are interconnected. Each fish screen includes multiple grading rollers arranged in parallel. The grading rollers on the fish screen have protrusions that form a fish-blocking structure. The fish-blocking structure is a triangular protrusion located in the middle of the length of the fish screen, and the tip of the fish-blocking structure is perpendicular to the axial direction of the grading rollers and faces upward. When the fish fry move downward along the fish screen under the action of gravity, the fish-blocking structure blocks the fish fry. Under the action of inertia, the fish fry jump upward along the fish-blocking structure perpendicular to the fish screen before falling, thus adjusting the orientation of the fish fry. The spacing between the grading rollers of the multi-stage screening structure decreases progressively along the setting direction of the frame, and the spacing between the grading rollers of the screening structure closer to the fish inlet is greater than the spacing between the grading rollers of the screening structure farther away from the fish inlet. Fish fry of the corresponding size enter the corresponding fish collection pipe through the corresponding fish screen and are output. When the size is smaller than the size of the fish fry corresponding to the screening structure of that stage, the fish fry fall into the fish screen of the next stage screening structure through the gap between the grading rollers.

2. The fish fry grading and screening device according to claim 1, characterized in that: Each of the fish sieves is set at an angle, with the end of the fish sieve closest to the fish inlet at a higher height than the end of the fish sieve furthest from the fish inlet.

3. The fish fry grading and screening device according to claim 1, characterized in that: The fish collection pipe is equipped with a fish conveying channel and a baffle. The fish conveying channel is connected to the end of the same level fish screen that is away from the fish inlet. The baffle is used to limit the movement of the fish fry.

4. The fish fry grading and screening device according to claim 3, characterized in that: The fish collection pipe is also provided with a lower limit plate, and the frame is provided with an inclined mounting plate. The mounting plate is provided with multiple mounting grooves corresponding to each level of the fish screen. The two ends of the fish screen are respectively placed on the corresponding lower limit plate and mounting groove.

5. The fish fry grading and screening device according to claim 4, characterized in that: Each stage of the screening structure also includes multiple nozzles mounted on the mounting plate and a guide plate mounted on the fish screen. The nozzles are positioned toward the guide plate, which is located at the fish-blocking structure. The guide plate has interval grooves corresponding to the grading rollers. The direction of the water flow from the nozzles is the same as the direction of the central axis of the grading rollers.

6. The fish fry grading and screening device according to claim 5, characterized in that: The guide plate is an arc-shaped plate.

7. The fish fry grading and screening device according to claim 6, characterized in that: The center point of the arc-shaped trajectory of the guide plate is on the central axis of the fish-blocking structure along the width of the fish screen, and the center point of the arc-shaped trajectory on the guide plate is farther away from the fish inlet than the fish-blocking structure.

8. The fish fry grading and screening device according to claim 1, characterized in that: The frame is also equipped with a second fish inlet that is connected to the fish suction pump, and a guide cover is provided at the second fish inlet.

9. The fish fry grading and screening device according to claim 1, characterized in that: The frame is equipped with a water spray pipe, which is connected to a centrifugal pump. The water spray pipe is positioned towards the fish screen net, and the centrifugal pump is used to provide water pressure.

10. The fish fry grading and screening device according to claim 1, characterized in that: It also includes a vibration assembly. The bottom of the frame is connected to a support frame. The vibration assembly includes a vibration motor and a buffer spring. The vibration motor is mounted on the support frame and is used to generate vibration. A support rod is provided at the connection between the support frame and the frame. The buffer spring is sleeved on the support rod.

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