Fry screening device for aquaculture

Abstract

The invention discloses a fry screening device for aquaculture. The fry screening device comprises a base, a screening box, a screen assembly and a telescopic mechanism. A circulating water supply device and a fry conveying device are mounted on the base; the screening box is installed on the base through the adjusting mechanism. The adjusting mechanism is used for adjusting the inclination angle of the screening box. Buoys are installed at the two ends of the screen assembly and slidably connected with the inner wall of the screening box. The telescopic mechanism is installed on the top wall of the screening box, and the telescopic end of the telescopic mechanism makes contact with the top of the screen assembly. An inlet is formed in the top of the screening box, a first seedling arranging assembly is arranged in the middle of the side wall of the screening box, and a second seedling arranging assembly is arranged at the bottom of the side wall. The inlet is communicated with the discharging end of the fry conveying device, and the circulating water supply device is communicated with an inner cavity of the screening box. The fish fry screening device can achieve automatic fish fry screening operation, the fish fry screening process is accelerated, and the screening efficiency is improved.

Description

Technical Field

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

[0002] In the aquaculture industry, the screening of fry is a crucial link, which not only directly affects the growth and survival rate of fry, but also relates to the economic benefits and sustainable development of aquaculture. In order to improve the efficiency and accuracy of fry screening and reduce the damage of fry during the screening process, in recent years, automated and intelligent fry screening equipment has gradually become a research hotspot in the industry.

[0003] However, the existing automated screening equipment still has some shortcomings. For example, the design of the screening box is not flexible enough, and the tilt angle cannot be adjusted according to actual needs, which makes it difficult to quickly discharge the screened fry, increasing the screening time; and because the screen group is fixed, the fry cannot fully contact the water during the screening process, resulting in low screening efficiency.

[0004] Therefore, a fry screening device for aquaculture is proposed. Summary of the invention

[0005] The object of the present invention is to provide a fry screening device for aquaculture, aiming to solve or improve at least one of the above-mentioned technical problems.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a fry screening device for aquaculture, comprising:

[0007] A base, on which a circulating water supply device and a fry conveying device are installed;

[0008] A screening box, the screening box being mounted on the base through an adjusting mechanism, the adjusting mechanism being used to adjust the inclination angle of the screening box;

[0009] A screen assembly, wherein buoys are installed at both ends of the screen assembly, and the buoys are slidably connected to the inner wall of the screening box;

[0010] A telescopic mechanism, the telescopic mechanism is mounted on the top wall of the screening box, and a telescopic end of the telescopic mechanism contacts the top of the screen assembly;

[0011] Among them, an inlet is opened at the top of the screening box, a first seedling discharge assembly is provided in the middle section of the side wall of the screening box, and a second seedling discharge assembly is provided at the bottom of the side wall; the inlet is connected to the discharge end of the fry conveying equipment, and the circulating water supply equipment is connected to the inner cavity of the screening box.

[0012] According to a fry screening device for aquaculture provided by the present invention, a control system is installed on the base, a water level meter is installed in the screening box, and the water level meter, the first fry row assembly and the second fry row assembly are all electrically connected to the control system.

[0013] According to the fry screening device for aquaculture provided by the present invention, the cross section of the screen assembly is in a broken line shape.

[0014] According to a fry screening device for aquaculture provided by the present invention, the screen assembly comprises a first folded line screen and a second folded line screen, the first folded line screen is placed on the top surface of the second folded line screen, the first folded line screen and the second folded line screen are both provided with a plurality of rectangular screening slots, the plurality of rectangular screening slots are arranged at equal intervals, and the telescopic end of the telescopic mechanism is in contact with the top of the first folded line screen;

[0015] The buoys are fixedly connected to both sides of the first fold line screen, and positioning components are respectively installed on both sides of the second fold line screen. The positioning components are detachably connected to the buoys, and the positioning components are used to adjust the overlapping area of ​​the rectangular screening groove of the first fold line screen and the rectangular screening groove of the second fold line screen.

[0016] According to a fry screening device for aquaculture provided by the present invention, the positioning assembly comprises a first positioning block, a second positioning block and a positioning bolt; the positioning bolt is threadedly connected to the second positioning block, the positioning bolt passes through the second positioning block, and is threadedly connected to the first positioning block; two washers are threadedly connected to the positioning bolt, and the two washers are respectively abutted against two side surfaces of the first positioning block;

[0017] The two first positioning blocks are respectively fixed on the bottom surface of the buoy, and connecting wing plates are respectively installed on both sides of the second folding line screen, and the two second positioning blocks are respectively fixed on the connecting wing plates.

[0018] According to a fry screening device for aquaculture provided by the present invention, the side wall of the screening box is provided with an interlayer, and a plurality of water inlet nozzles are installed on the top of the inner wall of the screening box, and the plurality of water inlet nozzles are all connected to the interlayer;

[0019] The circulating water supply equipment includes a water inlet box installed on the base, a telescopic hose is installed on the water inlet box, the bottom of the telescopic hose extends into the bottom of the inner cavity of the water inlet box, and the top of the telescopic hose is connected to the interlayer; a circulating pump and a first solenoid valve are installed on the telescopic hose.

[0020] According to a fry screening device for aquaculture provided by the present invention, the adjustment mechanism includes two support columns and two electric push rods, the two support columns are hinged side by side at intervals on one side of the bottom of the screening box, and the two electric push rods are hinged side by side on one side of the bottom of the screening box away from the support columns; the bottom of the support column is fixedly connected to the base, and the bottom of the electric push rod is hinged to the base.

[0021] According to a fry screening device for aquaculture provided by the present invention, a lower connecting block is fixedly connected at the top center of the first folding screen, a through hole is opened at the top of the screening box, and a sliding block is fixedly connected to the inner wall of the through hole;

[0022] The telescopic mechanism comprises a driving motor, a sleeve and a screw; a slide groove is provided on the side wall of the screw, the slide groove is slidably connected with the slider, the bottom of the screw extends into the screening box, and an upper connecting block is fixedly connected to the bottom of the screw, and the upper connecting block is located directly above the lower connecting block;

[0023] The sleeve is rotatably connected to the top of the screening box, a gear ring is circumferentially fixed to the outer wall of the sleeve, the drive motor is installed on the top of the screening box, and a gear meshing with the gear ring is installed on the output shaft of the drive motor; the top of the screw rod extends into the sleeve and is threadedly connected to the inner wall of the sleeve.

[0024] According to a fry screening device for aquaculture provided by the present invention, the fry conveying equipment includes a fish pump, which is installed on the base through a bracket, a fish inlet pipe is installed at the feed end of the fish pump, and a fish discharge pipe is installed at the discharge end, one end of the fish discharge pipe faces the inlet, and a quick connector is installed at one end of the fish inlet pipe.

[0025] According to a fry screening device for aquaculture provided by the present invention, the first fry discharge assembly comprises a first rectangular discharge pipe and a first electric valve, the first electric valve is installed in the first rectangular discharge pipe, and the first rectangular discharge pipe is installed in the middle section of the side wall of the screening box;

[0026] The second seedling discharge assembly includes a second rectangular discharge pipe and a second electric discharge valve, the second electric discharge valve is installed in the second rectangular discharge pipe, and the second rectangular discharge pipe is installed at the bottom of the side wall of the screening box; the first electric discharge valve and the second electric discharge valve are both electrically connected to the control system.

[0027] The present invention discloses the following technical effects:

[0028] The present invention can flexibly adjust the inclination angle of the screening box through the adjustment mechanism, so that large-sized fry can be quickly dumped out of the screening box along the first fry row assembly after screening, thereby reducing the fry screening time and improving the screening efficiency;

[0029] The present invention ensures the stability and smoothness of the screen assembly during the screening process by slidably connecting the buoys installed at both ends of the screen assembly with the inner wall of the screening box, reduces the impact and damage to the fry during the screening process, and is beneficial to protecting the health and survival rate of the fry.

[0030] The present invention drives the screen assembly to move downward by periodically extending the telescopic mechanism, so that the fry are immersed in the water body, and the screen assembly moves upward under the buoyancy of the buoy by periodically retracting the telescopic mechanism, thereby realizing the up and down movement of the screen assembly, accelerating the fry screening process, and further improving the screening efficiency;

[0031] The invention realizes automatic conveying and screening of fry by connecting the inlet opened at the top of the screening box with the discharge end of the fry conveying device. After the fry are screened by the screen assembly, the small-sized fry are discharged from the second fry row assembly, and the large-sized fry are discharged from the first fry row assembly along the surface of the filter assembly, thereby improving the screening efficiency.

[0032] The present invention is connected with the inner cavity of the screening box through a circulating water supply device, which can provide suitable water flow conditions according to the screening requirements, thereby enhancing the adaptability and flexibility of the screening equipment. When the screening is completed, after the small-sized fry are discharged from the second row of fry components, water is supplied to the screening box through the circulating water supply device, so that the screen assembly floats to the vicinity of the first row of fry components under the buoyancy of the float, and the fry are quickly discharged under the action of the regulating mechanism, thereby realizing automated fry screening operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 for Figure 1 A partial enlarged view of middle A;

[0036] Figure 3 for Figure 1 A partial enlarged view of B in the middle;

[0037] Figure 4 is a side view of the present invention;

[0038] Figure 5 This is a schematic diagram of the rectangular screening slots in the present invention in a completely overlapped state;

[0039] Figure 6 for Figure 5 A partial enlarged view of middle C;

[0040] Figure 7 It is a schematic diagram of the rectangular screening slots in the present invention in a misaligned and overlapped state.

[0041] Among them, 1. base; 2. screening box; 3. buoy; 4. inlet; 5. control system; 6. first fold line screen; 7. second fold line screen; 8. rectangular screening trough; 9. first positioning block; 10. second positioning block; 11. positioning bolt; 12. connecting wing plate; 13. gasket; 14. water inlet nozzle; 15. water inlet tank; 16. telescopic hose; 17. circulating pump; 18. support column; 19. electric push rod; 20. lower connecting block; 21. through hole; 22. slider; 23. driving motor; 24. sleeve; 25. screw; 26. slide; 27. upper connecting block; 28. gear ring; 29. ​​gear; 30. fish pump; 31. bracket; 32. fish inlet pipe; 33. fish discharge pipe; 34. quick connector; 35. first rectangular discharge pipe; 36. second rectangular discharge pipe. DETAILED DESCRIPTION

[0042] 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.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Reference Figure 1-Figure 7 The present invention provides a fry screening device for aquaculture, comprising:

[0045] A base 1, on which a circulating water supply device and a fry conveying device are installed;

[0046] The screening box 2 is mounted on the base 1 through an adjusting mechanism, and the adjusting mechanism is used to adjust the inclination angle of the screening box 2;

[0047] The screen assembly is provided with buoys 3 at both ends of the screen assembly, and the buoys 3 are slidably connected to the inner wall of the screening box 2; the inner wall of the screening box 2 is provided with a slide rail, and the buoys 3 are slidably connected to the slide rail; through the restriction of the buoys 3 and the slide rail, after the screening box 2 adjusts its inclination angle, the screen assembly keeps inclining synchronously with the screening box 2, thereby realizing efficient material discharge;

[0048] A telescopic mechanism, the telescopic mechanism is mounted on the top wall of the screening box 2, and the telescopic end of the telescopic mechanism contacts the top of the screen assembly;

[0049] Among them, an inlet 4 is opened on the top of the screening box 2, a first seedling row assembly is provided in the middle section of the side wall of the screening box 2, and a second seedling row assembly is provided at the bottom of the side wall; the inlet 4 is connected to the discharge end of the fry conveying equipment, and the circulating water supply equipment is connected to the inner cavity of the screening box 2;

[0050] With such arrangement, the present invention can flexibly adjust the inclination angle of the screening box 2 through the adjustment mechanism, so that large-sized fry can be quickly dumped out of the screening box along the first fry row assembly after screening, thereby reducing the fry screening time and improving the screening efficiency and accuracy;

[0051] The present invention ensures the stability and smoothness of the screen assembly during the screening process by slidably connecting the buoys 3 installed at both ends of the screen assembly to the inner wall of the screening box 2, thereby reducing the impact and damage to the fry during the screening process, which is beneficial to protecting the health and survival rate of the fry.

[0052] The present invention drives the screen assembly to move downward by periodically extending the telescopic mechanism, so that the fry are immersed in the water body, and the screen assembly moves upward under the buoyancy of the buoy 3 by periodically retracting the telescopic mechanism, thereby realizing the up and down movement of the screen assembly, accelerating the fry screening process, and further improving the screening efficiency;

[0053] The present invention realizes automatic conveying and screening of fry by connecting the inlet opened at the top of the screening box 2 with the discharge end of the fry conveying device. After the fry are screened by the screen assembly, the small-sized fry are discharged from the second fry discharge assembly, and the large-sized fry are discharged from the first fry discharge assembly along the surface of the filter assembly, thereby improving the screening efficiency.

[0054] The present invention is connected with the inner cavity of the screening box 2 through a circulating water supply device, which can provide suitable water flow conditions according to the screening requirements, thereby enhancing the adaptability and flexibility of the screening equipment. When the screening is completed, after the small-sized fry are discharged from the second row of fry components, water is supplied to the screening box through the circulating water supply device, so that the screen assembly floats to the vicinity of the first row of fry components under the buoyancy of the buoy 3, and the fry are quickly discharged under the action of the regulating mechanism, thereby realizing an automated fry screening operation.

[0055] Further optimizing the scheme, a control system 5 is installed on the base 1, a water level meter is installed in the screening box 2, and the water level meter, the first seedling row assembly and the second seedling row assembly are all electrically connected to the control system 5;

[0056] The water level height in the screening box 2 can be monitored in real time by the water level meter, and the detected water level data can be transmitted to the control system 5. When the screening is completed, the water level height in the screening box 2 is adjusted to the set height so that the lowest point of the top surface of the screen assembly is aligned with the first row of seedlings assembly, and then the control system 5 controls the first row of seedlings assembly to open, and at the same time the adjustment mechanism adjusts the inclination angle of the screening box 2 to quickly discharge the large-sized fry on the surface of the screen assembly along the first row of seedlings assembly.

[0057] To further optimize the solution, the cross-section of the screen assembly is in a zigzag shape. On the one hand, the zigzag screen assembly increases the screening area, which is convenient for rapid screening of fry, thereby improving the screening efficiency. On the other hand, the large-sized fry after screening are retained at the lower surface of the screen assembly. After the adjustment mechanism adjusts the inclination angle of the screening box 2, the fry can be discharged quickly, reducing the time the fry stay in the screening box and improving work efficiency.

[0058] Further optimized, the screen assembly includes a first folded line screen 6 and a second folded line screen 7, the first folded line screen 6 is placed on the top surface of the second folded line screen 7, the first folded line screen 6 and the second folded line screen 7 are both provided with a plurality of rectangular screening slots 8, the plurality of rectangular screening slots 8 are arranged at equal intervals, and the telescopic end of the telescopic mechanism contacts the top of the first folded line screen 6;

[0059] The first folded line screen 6 is fixedly connected with buoys 3 on both sides, and the second folded line screen 7 is respectively installed with positioning components, which are detachably connected to the buoys 3 and are used to adjust the overlapping area of ​​the rectangular screening slot 8 of the first folded line screen 6 and the rectangular screening slot 8 of the second folded line screen 7;

[0060] The first fold line screen 6 and the second fold line screen 7 are superimposed to form a multi-level screening structure. By adjusting the positioning assembly, the overlapping area of ​​the rectangular screening slots 8 on the first fold line screen 6 and the second fold line screen 7 can be changed, thereby adjusting the screening aperture size to meet the screening needs of fry of different sizes.

[0061] Further optimized solution, the positioning assembly includes a first positioning block 9, a second positioning block 10 and a positioning bolt 11; the positioning bolt 11 is threadedly connected to the second positioning block 10, the positioning bolt 11 passes through the second positioning block 10, and is threadedly connected to the first positioning block 9; two washers 13 are threadedly connected to the positioning bolt 11, and the two washers 13 are respectively abutted against the two side surfaces of the first positioning block 9;

[0062] The two first positioning blocks 9 are respectively fixed on the bottom surface of the buoy 3, and connecting wing plates 12 are respectively installed on both sides of the second folding screen 7, and the two second positioning blocks 10 are respectively fixed on the connecting wing plates 12;

[0063] By rotating the positioning bolt 11, the spacing between the first positioning block 9 and the second positioning block 10 is adjusted, thereby adjusting the overlapping area of ​​the rectangular screening slot 8 of the first fold line screen 6 and the rectangular screening slot 8 of the second fold line screen 7, so as to realize the aperture adjustment of the sieve hole, which is convenient for adapting to the screening conditions of fry of different species and the same growth cycle; after the aperture adjustment is completed, the position is fixed by two gaskets 13.

[0064] According to a further optimization scheme, a side wall of the screening box 2 is provided with an interlayer, and a plurality of water inlet nozzles 14 are installed on the top of the inner wall of the screening box 2, and the plurality of water inlet nozzles 14 are all connected to the interlayer;

[0065] The circulating water supply device includes a water inlet box 15 installed on the base 1, and a telescopic hose 16 is installed on the water inlet box 15. The bottom of the telescopic hose 16 extends into the bottom of the inner cavity of the water inlet box 15, and the top of the telescopic hose 16 is connected to the interlayer; a circulating pump 17 and a first solenoid valve are installed on the telescopic hose 16;

[0066] By arranging an interlayer on the side wall of the screening box 2 and connecting the water inlet nozzle 14 with the interlayer, it can be ensured that the water flow is evenly sprayed into the screening box 2 through the water inlet nozzle 14, thereby avoiding the water flow from directly impacting the screen assembly, reducing the interference and damage to the fry during the screening process, and improving the accuracy of screening and the survival rate of the fry; the water flow can drive the fry to be evenly distributed on the screen assembly, thereby improving the screening efficiency, and the water flow can also take away the impurities and waste generated during the screening process, thereby keeping the screening box 2 clean and hygienic;

[0067] The elasticity of the telescopic hose 16 allows the water flow to be flexibly adjusted, the circulating pump 17 provides stable water flow power, and the first solenoid valve is used to accurately control the opening and closing of the water flow, as well as adjust the flow rate and flow velocity of the water flow, thereby enhancing the controllability of the water flow during the screening process and making the screening effect more stable and reliable.

[0068] To further optimize the solution, the adjustment mechanism includes two support columns 18 and two electric push rods 19. The two support columns 18 are hinged side by side at intervals on one side of the bottom of the screening box 2, and the two electric push rods 19 are hinged side by side on the side of the bottom of the screening box 2 away from the support columns 18; the bottom of the support column 18 is fixedly connected to the base 1, and the bottom of the electric push rod 19 is hinged to the base 1; the inclination angle of the screening box 2 can be adjusted by extending and retracting the electric push rod 19.

[0069] According to a further optimized solution, a lower connecting block 20 is fixedly connected to the top center of the first folding screen 6, a through hole 21 is opened on the top of the screening box 2, and a slider 22 is fixedly connected to the inner wall of the through hole 21;

[0070] The telescopic mechanism includes a driving motor 23, a sleeve 24 and a screw 25; a slide groove 26 is provided on the side wall of the screw 25, the slide groove 26 is slidably connected to the slider 22, the bottom of the screw 25 extends into the screening box 2, and an upper connecting block 27 is fixedly connected to the bottom of the screw 25, and the upper connecting block 27 is located directly above the lower connecting block 20;

[0071] The sleeve 24 is rotatably connected to the top of the screening box 2, a gear ring 28 is circumferentially fixed to the outer wall of the sleeve 24, a driving motor 23 is installed on the top of the screening box 2, and a gear 29 meshing with the gear ring 28 is installed on the output shaft of the driving motor 23; the top of the screw 25 extends into the sleeve 24 and is threadedly connected to the inner wall of the sleeve 24;

[0072] The gear 29 is driven forward or reversely by the driving motor 23, thereby driving the sleeve 24 meshing with the gear ring 28 to rotate. Since the screw 25 is threadedly connected to the inner wall of the sleeve 24, and the slide groove 26 at the bottom of the screw 25 is slidably connected to the slider 22 at the top of the screening box 2, the rotation of the sleeve 24 will be converted into the up and down movement of the screw 25. The upper connecting block 27 at the bottom of the screw 25 cooperates with the lower connecting block 20 at the top of the first folded line screen 6, and under the buoyancy of the buoy 3, the up and down reciprocating movement of the screen assembly is realized.

[0073] A further optimized solution is that the fry conveying equipment includes a fish pump 30, which is installed on the base 1 through a bracket 31. A fish inlet pipe 32 is installed at the feed end of the fish pump 30, and a fish discharge pipe 33 is installed at the discharge end. One end of the fish discharge pipe 33 faces the inlet 4, and a quick connector 34 is installed at one end of the fish inlet pipe 32.

[0074] Further optimizing the scheme, the first seedling discharge assembly includes a first rectangular discharge pipe 35 and a first electric discharge valve, the first electric discharge valve is installed in the first rectangular discharge pipe 35, and the first rectangular discharge pipe 35 is installed in the middle section of the side wall of the screening box 2;

[0075] The second seedling discharge assembly includes a second rectangular discharge pipe 36 and a second electric discharge valve. The second electric discharge valve is installed in the second rectangular discharge pipe 36. The second rectangular discharge pipe 36 is installed at the bottom of the side wall of the screening box 2. The first electric discharge valve and the second electric discharge valve are both electrically connected to the control system 5.

[0076] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technical users in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fry screening device for aquaculture, characterized in that: include: A base (1), on which a circulating water supply device and a fry conveying device are installed; A screening box (2), the screening box (2) being mounted on the base (1) via an adjustment mechanism, the adjustment mechanism being used to adjust the inclination angle of the screening box (2); A screen assembly, wherein buoys (3) are installed at both ends of the screen assembly, and the buoys (3) are slidably connected to the inner wall of the screening box (2); A telescopic mechanism, the telescopic mechanism being mounted on the top wall of the screening box (2), the telescopic end of the telescopic mechanism being in contact with the top of the screen assembly; The top of the screening box (2) is provided with an inlet (4), the middle section of the side wall of the screening box (2) is provided with a first seedling discharge assembly, and the bottom section of the side wall is provided with a second seedling discharge assembly; the inlet (4) is connected to the discharge end of the fry conveying device, and the circulating water supply device is connected to the inner cavity of the screening box (2).

2. The fry screening device for aquaculture according to claim 1, characterized in that: A control system (5) is installed on the base (1), a water level meter is installed in the screening box (2), and the water level meter, the first seedling row assembly and the second seedling row assembly are all electrically connected to the control system (5).

3. The fry screening device for aquaculture according to claim 1, characterized in that: The cross section of the screen assembly is in a broken line shape.

4. The fry screening device for aquaculture according to claim 3, characterized in that: The screen assembly comprises a first folded line screen (6) and a second folded line screen (7), the first folded line screen (6) is placed on the top surface of the second folded line screen (7), the first folded line screen (6) and the second folded line screen (7) are both provided with a plurality of rectangular screening slots (8), the plurality of rectangular screening slots (8) are arranged at equal intervals, and the telescopic end of the telescopic mechanism is in contact with the top of the first folded line screen (6); The buoys (3) are fixedly connected to both sides of the first folded line screen (6), and positioning components are respectively installed on both sides of the second folded line screen (7). The positioning components are detachably connected to the buoys (3), and the positioning components are used to adjust the overlapping area of ​​the rectangular screening groove (8) of the first folded line screen (6) and the rectangular screening groove (8) of the second folded line screen (7).

5. The fry screening device for aquaculture according to claim 4, characterized in that: The positioning assembly comprises a first positioning block (9), a second positioning block (10) and a positioning bolt (11); the positioning bolt (11) is threadedly connected to the second positioning block (10), the positioning bolt (11) passes through the second positioning block (10) and is threadedly connected to the first positioning block (9); two washers (13) are threadedly connected to the positioning bolt (11), and the two washers (13) are respectively in contact with two side surfaces of the first positioning block (9); The two first positioning blocks (9) are respectively fixed to the bottom surface of the buoy (3), connecting wing plates (12) are respectively installed on both sides of the second folding line screen (7), and the two second positioning blocks (10) are respectively fixed to the connecting wing plates (12).

6. The fry screening device for aquaculture according to claim 1, characterized in that: The side wall of the screening box (2) is provided with an interlayer, and a plurality of water inlet nozzles (14) are installed on the top of the inner wall of the screening box (2), and the plurality of water inlet nozzles (14) are all connected to the interlayer; The circulating water supply equipment comprises a water inlet box (15) mounted on the base (1); a telescopic hose (16) is mounted on the water inlet box (15); the bottom of the telescopic hose (16) extends into the bottom of the inner cavity of the water inlet box (15); the top of the telescopic hose (16) is connected to the interlayer; a circulating pump (17) and a first solenoid valve are mounted on the telescopic hose (16).

7. The fry screening device for aquaculture according to claim 1, characterized in that: The adjustment mechanism comprises two support columns (18) and two electric push rods (19); the two support columns (18) are hinged side by side and spaced apart on one side of the bottom of the screening box (2); the two electric push rods (19) are hinged side by side on one side of the bottom of the screening box (2) away from the support columns (18); the bottom of the support column (18) is fixedly connected to the base (1), and the bottom of the electric push rod (19) is hinged to the base (1).

8. The fry screening device for aquaculture according to claim 4, characterized in that: A lower connecting block (20) is fixedly connected at the center of the top of the first folding screen (6), a through hole (21) is opened on the top of the screening box (2), and a sliding block (22) is fixedly connected to the inner wall of the through hole (21); The telescopic mechanism comprises a driving motor (23), a sleeve (24) and a screw (25); a side wall of the screw (25) is provided with a slide groove (26), the slide groove (26) is slidably connected to the slider (22), the bottom of the screw (25) extends into the screening box (2), and an upper connecting block (27) is fixedly connected to the bottom of the screw (25), and the upper connecting block (27) is located directly above the lower connecting block (20); The sleeve (24) is rotatably connected to the top of the screening box (2); a gear ring (28) is circumferentially fixed to the outer wall of the sleeve (24); the drive motor (23) is mounted on the top of the screening box (2); and a gear (29) meshing with the gear ring (28) is mounted on the output shaft of the drive motor (23); the top of the screw rod (25) extends into the sleeve (24) and is threadedly connected to the inner wall of the sleeve (24).

9. The fry screening device for aquaculture according to claim 1, characterized in that: The fry conveying device comprises a fish pump (30), which is mounted on the base (1) via a bracket (31), a fish inlet pipe (32) is mounted on the feed end of the fish pump (30), and a fish discharge pipe (33) is mounted on the discharge end, one end of the fish discharge pipe (33) faces the inlet (4), and a quick-connect joint (34) is mounted on one end of the fish inlet pipe (32).

10. The fry screening device for aquaculture according to claim 2, characterized in that: The first seedling discharge assembly comprises a first rectangular discharge pipe (35) and a first electric discharge valve, wherein the first electric discharge valve is installed in the first rectangular discharge pipe (35), and the first rectangular discharge pipe (35) is installed in the middle section of the side wall of the screening box (2); The second seedling discharge assembly comprises a second rectangular discharge pipe (36) and a second electric discharge valve, wherein the second electric discharge valve is installed in the second rectangular discharge pipe (36), and the second rectangular discharge pipe (36) is installed at the bottom of the side wall of the screening box (2); the first electric discharge valve and the second electric discharge valve are both electrically connected to the control system (5).

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