A breeding and screening device for pre-erythrinus fish fry

Abstract

The present application relates to the technical field of fish breeding, particularly to a breeding and screening device for juvenile prochilodus, comprising: supporting legs, a water tank, a supporting plate, hinges, cover plates, handles, a water outlet pipe, a driving assembly and a screening assembly; the water tank is fixedly installed on the supporting legs, the supporting plate is fixedly installed on one side of the water tank, the cover plates are hingedly connected to the top of the water tank through the hinges, the handles are fixedly installed on the cover plates, the water outlet pipe is fixedly installed on the side of the water tank away from the supporting plate, the driving assembly is fixedly installed on the water tank, and the screening assembly is movably installed in the water tank; the present application can prevent the juvenile prochilodus from having stress reaction during breeding and screening, and can avoid the injury of the juvenile prochilodus without transferring the juvenile prochilodus, thereby greatly improving the screening efficiency of the juvenile prochilodus.

Description

Technical Field

[0001] This invention relates to the field of fish fry farming technology, and in particular to a screening device for raising fry of the forekharius bream. Background Technology

[0002] With the accelerated pace of industrialization and the continuous increase in the intensity of development in the Yangtze River Basin, human activities have increasingly interfered with aquatic ecosystems, causing irreversible damage to the natural migration routes and spawning habitats of many fish species. Such human intervention directly obstructs fish migration and spawning routes, reduces their living space, significantly increases the difficulty of completing their reproductive cycle, and seriously endangers the sustainability of natural fish reproduction.

[0003] The current method involves artificially breeding fish fry and releasing them into natural waters. By scientifically implementing stock enhancement and release, not only can the fish population in natural waters be effectively replenished, but the damaged ecosystem can also be revitalized.

[0004] During the rearing process of croaker fry, due to different growth rates, the size of the fry begins to vary significantly, resulting in fry of different sizes in the rearing ponds. At this point, it is necessary to manually select the fry using sieves of different mesh sizes to separate the fry into other rearing ponds. However, during the manual selection process, the fry are prone to stress reactions due to their photophobia. In addition, the fry are easily injured when transported by sieves, which reduces the efficiency of fry selection. Summary of the Invention

[0005] The technical objective of this invention is to solve the problems of stress response in the existing screening process of *Scrocodile bream* fry due to their photophobia, and the risk of injury during transport when the fry are caught in a screen, thus reducing screening efficiency. The invention aims to eliminate stress response in *Scrocodile bream* fry during screening, eliminate the need for fry transfer, avoid injury, and significantly improve screening efficiency.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A screening device for raising fry of the anterior loach includes: a support leg, a water tank, a support plate, a hinge, a cover plate, a handle, a water outlet pipe, a drive assembly, and a screening assembly;

[0008] A water tank is fixedly installed on multiple of the aforementioned support legs. A support plate is fixedly installed on one side of the water tank. Multiple cover plates are hinged to the top of the water tank via multiple hinges. A handle is fixedly installed on each of the multiple cover plates. A water outlet pipe is fixedly installed on the side of the water tank away from the support plate. The drive assembly is fixedly installed on the water tank. The screening assembly is movably installed inside the water tank.

[0009] The screening component adjusts the size of the sieve holes according to the size of the fish fry, and the driving component drives the screening component to move, thereby screening fish fry of different sizes.

[0010] As a preferred embodiment of the aquaculture screening device for fry of *Scoidea esculenta* according to the present invention, the screening component includes a rectangular shell, a longitudinal support, a transverse support, a longitudinal screw, a transverse screw, a longitudinal telescopic module, a transverse telescopic module, a mesh cable, and an adjusting motor.

[0011] A rectangular through hole is provided in the middle of the rectangular shell. Longitudinal supports are fixedly installed at the four corners of the rectangular shell. Transverse supports are fixedly installed at the four corners of the rectangular shell. A longitudinal screw is rotatably installed between two adjacent longitudinal supports. A transverse screw is rotatably installed between two adjacent transverse supports. Longitudinal sliders are slidably installed at both ends of the longitudinal screws. The two longitudinal sliders are located inside the two longitudinal supports. A longitudinal connecting block is provided on each of the two longitudinal sliders. Multiple longitudinal telescopic modules are fixedly installed between the two longitudinal connecting blocks. The multiple longitudinal telescopic modules are fixedly connected end to end.

[0012] The transverse screw has transverse sliders slidably mounted on both ends, and the two transverse sliders are located inside the two transverse supports. The two transverse sliders are each provided with a transverse connecting block. Multiple transverse telescopic modules are fixedly mounted between the two transverse connecting blocks, and the multiple transverse telescopic modules are fixedly connected end to end. Multiple network cables are fixedly mounted between the symmetrical longitudinal telescopic modules and the symmetrical transverse telescopic modules. The adjusting motor is fixedly mounted on one end of the transverse screw.

[0013] As a preferred embodiment of the aquaculture and screening device for fry of *Sinocyclocheilus bream* as described in this invention, wherein: the middle portions of the two longitudinal screws are respectively provided with longitudinal limiting blocks, and the thread directions on both sides of the longitudinal limiting blocks are opposite; the middle portions of the two transverse screws are respectively provided with transverse limiting blocks, and the thread directions on both sides of the transverse limiting blocks are opposite.

[0014] As a preferred embodiment of the aquaculture and screening device for fry of *Sinocyclocheilus bream* as described in this invention, wherein: longitudinal bevel gears are respectively provided on the three ends of the two longitudinal screws, and transverse bevel gears are respectively provided on the three ends of the two transverse screws, and the longitudinal bevel gears of the adjacent longitudinal screws mesh with the transverse bevel gears of the transverse screws.

[0015] As a preferred embodiment of the breeding and screening device for juvenile catfish described in this invention, the longitudinal telescopic module includes a longitudinal rectangular block, a longitudinal fixing cylinder, a longitudinal telescopic column, a longitudinal first compression spring, a longitudinal electromagnetic block, a longitudinal second compression spring, and a longitudinal locking block.

[0016] The inner side of the longitudinal rectangular block is fixedly connected to the end of the network cable. A longitudinal fixing cylinder is fixedly installed on the longitudinal rectangular block. A longitudinal telescopic column is slidably installed inside the longitudinal fixing cylinder. A longitudinal first compression spring is fixedly installed inside the longitudinal fixing cylinder, and the longitudinal first compression spring is located at the bottom of the longitudinal telescopic column. Multiple first holes are arranged in a circular array around the axis on the outer circumference of the longitudinal telescopic column. Multiple longitudinal electromagnetic blocks are fixedly installed inside the first holes. Multiple longitudinal second compression springs are fixedly installed inside the first holes. Multiple longitudinal locking blocks are slidably installed inside the first holes.

[0017] As a preferred embodiment of the breeding and screening device for juvenile catfish described in this invention, the lateral telescopic module includes a lateral rectangular block, a lateral fixing cylinder, a lateral telescopic column, a lateral first compression spring, a lateral electromagnetic block, a lateral second compression spring, and a lateral locking block.

[0018] The inner side of the horizontal rectangular block is fixedly connected to the end of the network cable. A horizontal fixing cylinder is fixedly installed on the horizontal rectangular block. A horizontal telescopic column is slidably installed inside the horizontal fixing cylinder. A horizontal first compression spring is fixedly installed inside the horizontal fixing cylinder, and the horizontal first compression spring is located at the bottom of the horizontal telescopic column. Multiple second holes are arranged in a circular array around the axis on the outer circumference of the horizontal telescopic column. Multiple horizontal electromagnetic blocks are fixedly installed inside the second holes. Multiple horizontal second compression springs are fixedly installed inside the second holes. Multiple horizontal locking blocks are slidably installed inside the second holes.

[0019] As a preferred embodiment of the breeding and screening device for juvenile catfish described in this invention, the longitudinal fixing cylinder has a plurality of first slots along the axis on its inner wall, and the first slots cooperate with the longitudinal locking block; the transverse fixing cylinder has a plurality of second slots along the axis on its inner wall, and the second slots cooperate with the transverse locking block.

[0020] In a preferred embodiment of the breeding and screening device for juvenile catfish described in this invention, distance sensors are fixedly installed at the bottom of the longitudinal fixing cylinder and the bottom of the transverse fixing cylinder, respectively.

[0021] As a preferred embodiment of the aquaculture and screening device for fry of *Sinocyclocheilus bream* according to the present invention, the driving component includes a drive motor, a drive screw, a first rotating wheel, a first belt, a second rotating wheel, a second belt, and a sliding block;

[0022] The drive motor is fixedly mounted on the support plate. The four drive screws are installed inside the water tank in parallel rotation, with one end of each drive screw penetrating one side of the water tank. One end of any drive screw located below the outside of the water tank is fixedly connected to the drive motor. The ends of the four drive screws located outside the water tank are each fixedly mounted with a first rotating wheel. Two vertically adjacent first rotating wheels are connected by a first belt. Two drive screws located above the outside of the water tank are each fixedly mounted with a second rotating wheel, and the two second rotating wheels are located outside the two first rotating wheels. The two second rotating wheels are connected by a second belt. Sliding blocks are slidably mounted on the four drive screws located inside the water tank, and the four sliding blocks are fixedly connected to the four corners of the rectangular shell.

[0023] As a preferred embodiment of the breeding and screening device for juvenile catfish described in this invention, wherein: a sealed rectangular telescopic sleeve is respectively fitted on both sides of the four sliding blocks, and the maximum telescopic length of the rectangular telescopic sleeve is 3 / 4 of the length of the driving screw.

[0024] The beneficial effects of this invention are:

[0025] 1. This invention provides a screening component and a driving component within the water tank. Through the cooperation of the driving component and the screening component, the screening component changes the size of the sieve holes, and under the drive of the driving component, the fish fry in the water tank are screened. This eliminates the need for manual screening, avoids stress on the fish fry, and eliminates the need to transfer the fish fry, thus avoiding injury to the fish fry and greatly improving the screening efficiency of the fish fry.

[0026] 2. This invention incorporates a longitudinal telescopic module and a transverse telescopic module within the screening component. The longitudinal and transverse screws simultaneously drive both modules to extend and retract, thereby moving the mesh. The size of the sieve holes is adjusted according to the required size of the fish fry to be screened, thus allowing for the screening of fry of different sizes. Combined with the drive component, the water tank is divided into two areas, eliminating the need to transfer the fry, preventing injury, and improving the screening efficiency.

[0027] 3. This invention incorporates longitudinal and transverse electromagnetic blocks within the longitudinal and transverse telescopic modules. These blocks, in conjunction with distance sensors, control the corresponding longitudinal and transverse locking blocks. Depending on the size of the fish fry, the locking blocks are positioned to create mesh openings of varying diameters, thus improving the screening efficiency for fish fry of different sizes. Attached Figure Description

[0028] Figure 1This is a schematic diagram of the overall three-dimensional structure in an embodiment of this disclosure.

[0029] Figure 2 This is a three-dimensional structural diagram of the entire embodiment of this disclosure from another perspective.

[0030] Figure 3 This is a three-dimensional structural diagram of the water tank interior in an embodiment of this disclosure.

[0031] Figure 4 This is a three-dimensional structural diagram of the screening component in an embodiment of this disclosure.

[0032] Figure 5 This is a three-dimensional structural diagram of the internal structure of the screening component in an embodiment of this disclosure.

[0033] Figure 6 As described in this embodiment of the disclosure Figure 5 Enlarged view of point A in the middle.

[0034] Figure 7 As described in this embodiment of the disclosure Figure 5 Enlarged view of point B in the middle.

[0035] Figure 8 As described in this embodiment of the disclosure Figure 5 Enlarged view of point C in the middle.

[0036] Figure 9 As described in this embodiment of the disclosure Figure 5 Enlarged view of point D in the middle.

[0037] Figure 10 This is a schematic diagram of the three-dimensional structure of the screening component without mesh wires in the embodiments of this disclosure.

[0038] Figure 11 This is a three-dimensional structural diagram of the longitudinal telescopic module in an embodiment of this disclosure.

[0039] Figure 12 This is a three-dimensional structural diagram of the internal structure of the longitudinal telescopic module in an embodiment of this disclosure.

[0040] Figure 13 This is a three-dimensional structural diagram of the internal structure of the lateral telescopic module in an embodiment of this disclosure.

[0041] Reference numerals: 1. Support leg; 2. Water tank; 3. Support plate; 4. Hinge; 5. Cover plate; 6. Handle; 7. Water outlet pipe; 8. Drive assembly; 81. Drive motor; 82. Drive screw; 83. First wheel; 84. First belt; 85. Second wheel; 86. Second belt; 87. Sliding block; 9. Screening assembly; 91. Rectangular shell; 911. Rectangular through hole; 92. Longitudinal support; 93. Transverse support; 94. Longitudinal screw; 941. Longitudinal limiting block; 942. Longitudinal slider; 943. Longitudinal connecting block; 944. Longitudinal bevel gear; 95. Transverse screw; 951. Transverse limiting block; 952. Transverse slider; 953. Transverse connecting block; 95 4. Horizontal bevel gear; 96. Longitudinal telescopic module; 961. Longitudinal rectangular block; 962. Longitudinal fixing cylinder; 9621. First slot; 963. Longitudinal telescopic column; 9631. First hole; 964. Longitudinal first compression spring; 965. Longitudinal electromagnetic block; 966. Longitudinal second compression spring; 967. Longitudinal locking block; 97. Horizontal telescopic module; 971. Horizontal rectangular block; 972. Horizontal fixing cylinder; 9721. Second slot; 973. Horizontal telescopic column; 9731. Second hole; 974. Horizontal first compression spring; 975. Horizontal electromagnetic block; 976. Horizontal second compression spring; 977. Horizontal locking block; 98. Network cable; 99. Adjusting motor. Detailed Implementation

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] like Figures 1 to 13 As shown, a screening device for raising fry of the foreleg loach includes: a support leg 1, a water tank 2, a support plate 3, a hinge 4, a cover plate 5, a handle 6, a water outlet pipe 7, a drive assembly 8, and a screening assembly 9.

[0044] A water tank 2 is fixedly installed on multiple support legs 1. A support plate 3 is fixedly installed on one side of the water tank 2. Multiple cover plates 5 are hinged to the top of the water tank 2 by multiple hinges 4. A handle 6 is fixedly installed on each of the multiple cover plates 5. A water outlet pipe 7 is fixedly installed on the side of the water tank 2 away from the support plate 3. The drive assembly 8 is fixedly installed on the water tank 2. The screening assembly 9 is movably installed inside the water tank 2.

[0045] The screening component 9 adjusts the size of the sieve holes according to the size of the fish fry, and the driving component 8 drives the screening component 9 to move, thereby screening fish fry of different sizes.

[0046] Multiple support legs 1 are securely connected to the bottom of the water tank 2 with bolts. A support plate 3 on one side of the water tank 2 is vertically fixed to the outer wall of the water tank 2. Its surface has pre-fitted mounting holes for supporting the drive motor 81. The cover plate 5 is opened upwards by hinges 4, which makes it easy for operators to observe the activity of fish fry in the water tank 2, feed them, or perform equipment maintenance. Each cover plate 5 is fixedly equipped with a non-slip rubber handle 6 for easy gripping and force application, improving the ease of operation. The water outlet pipe 7 is connected to the internal cavity of the water tank 2. The pipe is equipped with a manual valve, which can flexibly control the water flow rate and facilitate daily water changes. The drive assembly 8 provides stable power output for the movement of the screening assembly 9. The screening assembly 9 is movably installed inside the water tank 2 through a sliding structure. It can move freely along the length of the water tank 2 and maintains a minimum gap with the inner wall of the water tank 2 to prevent fish fry from escaping through the gaps and affecting the screening effect.

[0047] In actual use, the operator can issue a command through the control unit to drive the adjusting motor 99 in the screening component 9 according to the target size of the fry to be screened, thereby precisely adjusting the size of the sieve holes formed by the mesh 98 to ensure that the sieve hole size is completely matched with the target screening size. Subsequently, the drive component 8 is started, which in turn drives the screening component 9 to move horizontally from one side of the water tank 2 to the other side of the water tank 2 smoothly and slowly. During the movement, a reasonable gap is reserved between the screening component 9 and the inner wall of the water tank 2 according to the actual number of fry in the water tank 2 to avoid fry congestion. This prevents incomplete screening. By limiting the size of the sieve holes, fish fry that meet the size requirements can pass through smoothly. At the same time, fish fry that have missed the filter can be guided through the sieve holes by fish-attracting sound waves. Fish fry that do not meet the size requirements are intercepted on one side of the screening component 9, achieving efficient separation of fish fry of different sizes. After screening, the screening component 9 can also be adjusted to the minimum size and moved to the middle of the water tank 2 according to the breeding needs, dividing the water tank 2 into two independent chambers. This allows for the separate rearing of fish fry of different sizes in the same tank without the need to change the breeding container, greatly improving the convenience of breeding management.

[0048] like Figures 4 to 11 As shown, the screening component 9 includes a rectangular shell 91, a longitudinal support 92, a transverse support 93, a longitudinal screw 94, a transverse screw 95, a longitudinal telescopic module 96, a transverse telescopic module 97, a network cable 98, and an adjusting motor 99.

[0049] A rectangular through hole 911 is provided in the middle of the rectangular shell 91. A longitudinal support 92 is fixedly installed at each of the four corners of the rectangular shell 91. A transverse support 93 is fixedly installed at each of the four corners of the rectangular shell 91. A longitudinal screw 94 is rotatably installed between two adjacent longitudinal supports 92. A transverse screw 95 is rotatably installed between two adjacent transverse supports 93. A longitudinal slider 942 is slidably installed at both ends of the longitudinal screw 94. The two longitudinal sliders 942 are located inside the two longitudinal supports 92. A longitudinal connecting block 943 is provided on each of the two longitudinal sliders 942. A plurality of longitudinal telescopic modules 96 are fixedly installed between the two longitudinal connecting blocks 943. The plurality of longitudinal telescopic modules 96 are fixedly connected end to end.

[0050] The transverse screw 95 has transverse sliders 952 slidably mounted on both ends, and the two transverse sliders 952 are located inside the two transverse supports 93 respectively. The two transverse sliders 952 are respectively provided with transverse connecting blocks 953. Multiple transverse telescopic modules 97 are fixedly installed between the two transverse connecting blocks 953, and the multiple transverse telescopic modules 97 are fixedly connected end to end. Multiple network cables 98 are fixedly installed between the symmetrical longitudinal telescopic modules 96 and the symmetrical transverse telescopic modules 97 respectively. The adjusting motor 99 is fixedly installed at one end of the transverse screw 95.

[0051] The rectangular shell 91 is made of lightweight, high-strength alloy material and has an overall frame structure to reduce weight and facilitate flexible movement within the water tank 2. The rectangular through hole 911 is the main channel for fry screening, and its edges are rounded to avoid scratching the fry. The longitudinal support 92 and the transverse support 93 provide stable support for the rotation of the longitudinal screw 94 and the transverse screw 95.

[0052] Both ends of the longitudinal screw 94 are slidably mounted with longitudinal sliders 942 through internal thread engagement. Each longitudinal slider 942 has a longitudinal connecting block 943 on one side facing the middle of the rectangular shell 91. The connecting block is used to drive the expansion and contraction of adjacent network cables 98. Multiple longitudinal telescopic modules 96 are installed between two corresponding longitudinal connecting blocks 943, and the beginning and end ends of adjacent longitudinal telescopic modules 96 are rigidly connected to form a set of continuous telescopic units to ensure synchronous action when subjected to force.

[0053] Multiple lateral telescopic modules 97 are installed between two corresponding lateral connecting blocks 953. Adjacent lateral telescopic modules 97 are also rigidly connected end to end, forming another set of telescopic units that are perpendicular to the longitudinal telescopic module 96.

[0054] The longitudinal and transverse mesh lines 98 intersect each other perpendicularly, and the mesh formed by their intersection points is the sieve hole. The size of the sieve hole changes synchronously with the extension and retraction of the longitudinal and transverse telescopic modules 97.

[0055] The regulating motor 99 serves as the power source for adjusting the screen aperture. The output shaft of the regulating motor 99 is rigidly connected to the transverse screw 95 via a coupling. When started, it can directly drive the transverse screw 95 to rotate. Then, through the bevel gear at the end of the transverse screw 95 meshing with the bevel gear at the end of the longitudinal screw 94, it drives the longitudinal screw 94 and another set of transverse and longitudinal screws 94 to rotate synchronously, ultimately achieving the adjustment of the screen aperture size.

[0056] like Figure 5 As shown, the middle portions of the two longitudinal screws 94 are respectively provided with longitudinal limiting blocks 941, and the thread directions on both sides of the longitudinal limiting blocks 941 are opposite. The middle portions of the two transverse screws 95 are respectively provided with transverse limiting blocks 951, and the thread directions on both sides of the transverse limiting blocks 951 are opposite.

[0057] The longitudinal limiting block 941 is located at the center of the longitudinal screw 94, dividing the screw into left and right sections. The thread on the left side of the limiting block is a left-hand thread, while the thread on the right side is a right-hand thread. This symmetrical thread design ensures that when the longitudinal screw 94 rotates, the longitudinal sliders 942 at both ends can move synchronously towards the limiting block at the same speed. At the same time, the longitudinal limiting block 941 can prevent the longitudinal sliders 942 from getting too close: when the longitudinal sliders 942 move to the edge of the longitudinal limiting block 941 during adjustment, the end face of the longitudinal sliders 942 will fit against the side of the longitudinal limiting block 941, restricting the longitudinal sliders 942 from continuing to move and preventing damage to the longitudinal telescopic module 96 due to excessive compression beyond the designed stroke.

[0058] The lateral limiting block 951 is located in the middle of the lateral screw 95, dividing the lateral screw 95 into front and rear sections. The front end of the limiting block has a left-hand thread, and the rear end has a right-hand thread. This ensures that the lateral sliders 952 at both ends can move inward synchronously when the lateral screw 95 rotates, while also preventing the lateral telescopic module 97 from being over-compressed and damaged due to exceeding the design stroke.

[0059] like Figures 5 to 9 As shown, longitudinal bevel gears 944 are respectively provided on the three ends of the two longitudinal screws 94, and transverse bevel gears 954 are respectively provided on the three ends of the two transverse screws 95, and the longitudinal bevel gears 944 of the adjacent longitudinal screws 94 and the transverse bevel gears 954 of the transverse screws 95 mesh with each other.

[0060] The two longitudinal screws 94 have four ends, and three ends are fixedly mounted with longitudinal bevel gears 944. Similarly, the two transverse screws 95 have four ends, and three ends are fixedly mounted with transverse bevel gears 954. Furthermore, the transverse bevel gears 954 adjacent to the longitudinal bevel gears 944 mesh with each other.

[0061] When the regulating motor 99 drives one of the transverse screws 95 to rotate, the transverse bevel gear 954 at one end of the transverse screw 95 will mesh with the longitudinal bevel gear 944 at the end of the corresponding longitudinal screw 94, driving the longitudinal screw 94 to rotate; the power is further transmitted to the other longitudinal screw 94, and then the longitudinal bevel gear 944 at the end of the other longitudinal screw 94 drives the other transverse screw 95 to rotate, ultimately achieving full synchronous rotation of the two longitudinal screws 94 and the two transverse screws 95.

[0062] like Figures 11 to 13 As shown, the longitudinal telescopic module 96 includes a longitudinal rectangular block 961, a longitudinal fixed cylinder 962, a longitudinal telescopic column 963, a longitudinal first compression spring 964, a longitudinal electromagnetic block 965, a longitudinal second compression spring 966, and a longitudinal locking block 967.

[0063] The inner side of the longitudinal rectangular block 961 is fixedly connected to the end of the network cable 98. A longitudinal fixing cylinder 962 is fixedly installed on the longitudinal rectangular block 961. A longitudinal telescopic column 963 is slidably installed inside the longitudinal fixing cylinder 962. A longitudinal first compression spring 964 is fixedly installed inside the longitudinal fixing cylinder 962, and the longitudinal first compression spring 964 is located at the bottom of the longitudinal telescopic column 963. Multiple first holes 9631 are arranged in a ring array around the axis on the outer circumference of the longitudinal telescopic column 963. Multiple longitudinal electromagnetic blocks 965 are fixedly installed inside the first holes 9631 respectively. Multiple longitudinal second compression springs 966 are fixedly installed inside the first holes 9631 respectively. Multiple longitudinal locking blocks 967 are slidably installed inside the first holes 9631 respectively.

[0064] The longitudinal electromagnetic block 965 adopts a waterproof and sealed design. Its outer shell is made of corrosion-resistant engineering plastic, and the internal structure encapsulates an electromagnetic coil. The coil leads are connected to the control unit in a circuit. When energized, it generates a strong magnetic field to attract the longitudinal locking block 967. The longitudinal second compression spring 966 is a small stainless steel spring. One end of it is sleeved on the output end of the longitudinal electromagnetic block 965, and the other end abuts against the inner end face of the longitudinal locking block 967. In the initial state, it is in a naturally extended state, pushing the outer end of the longitudinal locking block 967 out of the first hole 9631.

[0065] The longitudinal locking block 967 has a cylindrical structure. Each first hole 9631 is equipped with an elastic dustproof and waterproof ring. The waterproof ring is made of water-resistant rubber and is fitted on the outer circumference of the longitudinal locking block 967. This does not affect the radial sliding of the locking block, but also effectively prevents water and impurities from entering the hole, thus avoiding short circuits in the longitudinal electromagnetic block 965, corrosion of the longitudinal second compression spring, or jamming of the longitudinal locking block 967. This ensures that the longitudinal telescopic module 96 maintains stable performance in a long-term underwater working environment.

[0066] like Figure 11 and Figure 12As shown, the lateral telescopic module 97 includes a lateral rectangular block 971, a lateral fixed cylinder 972, a lateral telescopic column 973, a lateral first compression spring 974, a lateral electromagnetic block 975, a lateral second compression spring 976, and a lateral locking block 977.

[0067] The inner side of the horizontal rectangular block 971 is fixedly connected to the end of the network cable 98. A horizontal fixing cylinder 972 is fixedly installed on the horizontal rectangular block 971. A horizontal telescopic column 973 is slidably installed inside the horizontal fixing cylinder 972. A horizontal first compression spring 974 is fixedly installed inside the horizontal fixing cylinder 972, and the horizontal first compression spring 974 is located at the bottom of the horizontal telescopic column 973. Multiple second holes 9731 are arranged in a ring array around the axis on the outer circumference of the horizontal telescopic column 973. Multiple horizontal electromagnetic blocks 975 are fixedly installed inside the second holes 9731. Multiple horizontal second compression springs 976 are fixedly installed inside the second holes 9731. Multiple horizontal locking blocks 977 are slidably installed inside the second holes 9731.

[0068] The horizontal electromagnetic block 975 adopts a waterproof and sealed design. Its outer shell is made of corrosion-resistant engineering plastic, and the internal structure encapsulates an electromagnetic coil. The coil leads are connected to the control unit in a circuit. When energized, it generates a strong magnetic field to attract the horizontal locking block 977. The horizontal second compression spring 976 is a small stainless steel spring. One end of it is sleeved on the output end of the horizontal electromagnetic block 975, and the other end abuts against the inner end face of the horizontal locking block 977. In its initial state, it is in a naturally extended state, pushing the outer end of the horizontal locking block 977 out of the second hole 9731.

[0069] The transverse locking block 977 has a cylindrical structure. Each second hole 9731 has an elastic dustproof and waterproof ring installed at its opening. The waterproof ring is made of water-resistant rubber and is fitted on the outer circumference of the transverse locking block 977. This does not affect the radial sliding of the locking block and effectively prevents water and impurities from entering the hole, thus avoiding short circuits in the transverse electromagnetic block 975, corrosion of the transverse second compression spring, or jamming of the transverse locking block 977. This ensures that the transverse telescopic module 97 maintains stable performance in long-term underwater working environments.

[0070] like Figure 12 and Figure 13 As shown, the inner wall of the longitudinal fixing cylinder 962 is provided with a plurality of first slots 9621 along the axis, and the first slots 9621 cooperate with the longitudinal locking block 967. The inner wall of the transverse fixing cylinder 972 is provided with a plurality of second slots 9721 along the axis, and the second slots 9721 cooperate with the transverse locking block 977.

[0071] When the longitudinal telescopic column 963 is pushed by the longitudinal slider 942 to compress the longitudinal first compression spring 964 and slide into the longitudinal fixed cylinder 962, the longitudinal electromagnetic block 965 is energized to attract and retract the longitudinal locking block 967. When the longitudinal telescopic column 963 moves to the target position, it is detected by the distance sensor, and the longitudinal electromagnetic block 965 is de-energized by the control unit. The longitudinal locking block 967 pops out under the action of the longitudinal second compression spring 966 and locks into the corresponding first locking slot 9621, thereby locking the spacing of the longitudinal mesh lines 98 and ensuring the stability of the longitudinal dimensions of the screen holes. The longitudinal locking block 967 can be locked into different positions in the first locking slot 9621 according to the size of the fish fry.

[0072] Similarly, when the transverse telescopic column 973 is pushed by the transverse slider 952 to compress the transverse first compression spring 974 and slide into the transverse fixed cylinder 972, the transverse electromagnetic block 975 is energized to attract and retract the transverse locking block 977. When the transverse telescopic column 973 moves to the target position, it is detected by the distance sensor, and the transverse electromagnetic block 975 is de-energized by the control unit. The transverse locking block 977 pops out under the action of the transverse second compression spring 976 and locks into the corresponding second slot 9721, thereby locking the spacing of the transverse mesh lines 98 and ensuring the stability of the transverse size of the screen holes. The transverse locking block 977 can be locked into different positions of the second slot 9721 according to the size of the fish fry.

[0073] Distance sensors are fixedly installed at the bottom of the longitudinal fixed cylinder 962 and the bottom of the transverse fixed cylinder 972, respectively.

[0074] During the operation of the longitudinal telescopic module 96 and the transverse telescopic module 97, the distance sensor emits laser signals to the bottom of the longitudinal telescopic column 963 and the transverse telescopic column 973 in real time. By receiving the reflected signals, the distance sensor calculates the real-time distance between itself and the bottom of the longitudinal telescopic column 963 and the transverse telescopic column 973, and converts this distance data into a standard electrical signal, which is then transmitted to the control unit of the equipment via a lead wire. The control unit has pre-stored distance thresholds corresponding to different screen hole sizes. When the distance value detected by the distance sensor reaches the threshold corresponding to the target screen hole, the control unit immediately issues a command to de-energize the corresponding longitudinal electromagnetic block 965 and transverse electromagnetic block 975. This causes the longitudinal locking block 967 and the transverse locking block 977 to pop out and lock into the first locking slot 9621 and the second locking slot 9721 under the action of the longitudinal second compression spring 966 and the transverse second compression spring 976, thus completing the precise positioning of the longitudinal telescopic column 963 and the transverse telescopic column 973.

[0075] like Figures 1 to 3 As shown, the drive assembly 8 includes a drive motor 81, a drive screw 82, a first pulley 83, a first belt 84, a second pulley 85, a second belt 86, and a sliding block 87;

[0076] The drive motor 81 is fixedly mounted on the support plate 3. The four drive screws 82 are respectively installed inside the water tank 2 in parallel rotation. One end of each of the four drive screws 82 passes through one side of the water tank 2. One end of any one of the drive screws 82 located below the outside of the water tank 2 is fixedly connected to the drive motor 81. The ends of the four drive screws 82 located outside the water tank 2 are respectively fixedly mounted with first rotating wheels 83. Two vertically adjacent first rotating wheels 83 are connected by a first belt 84. The two drive screws 82 located above the outside of the water tank 2 are respectively fixedly mounted with second rotating wheels 85. The two second rotating wheels 85 are located outside the two first rotating wheels 83. The two second rotating wheels 85 are connected by a second belt 86. Sliding blocks 87 are slidably mounted on the four drive screws 82 located inside the water tank 2. The four sliding blocks 87 are respectively fixedly connected to the four corners of the rectangular shell 91.

[0077] The drive motor 81 is the power output source for the entire drive assembly 8. The four drive screws 82 are arranged in a rectangle, corresponding to the four corners of the rectangular shell 91 of the screening assembly 9. The four screws are parallel to each other. The same end of the four drive screws 82 extends through the side wall of the water tank 2 to the outside near the support plate 3. The penetration is dynamically sealed by a mechanical seal component, which not only ensures that the drive screws 82 can rotate freely, but also completely prevents water leakage in the water tank 2.

[0078] The drive motor 81 drives the lower drive screw 82 to rotate. The first wheel 83 of the drive screw 82 drives the vertically adjacent drive screw 82 above to rotate via the first belt 84. The second wheel 85 of the upper left drive screw 82 drives the upper right drive screw 82 to rotate via the second belt 86. The first wheel 83 of the upper right drive screw 82 then drives the lower right drive screw 82 to rotate via the first belt 84, thus achieving full synchronous rotation of the four drive screws 82, ensuring the consistency of the movement of the sliding block 87, and driving the screening component 9 to move horizontally via the sliding block 87.

[0079] Each of the four sliding blocks 87 is fitted with a sealed rectangular telescopic sleeve on both sides, and the maximum telescopic length of the rectangular telescopic sleeve is 3 / 4 of the length of the drive screw 82.

[0080] It should be noted that rectangular telescopic sleeves are provided on both sides of the sliding block 87. These sleeves are used to protect the internal drive screw 82, separating it from the water. They also prevent fish fry from getting close to the drive screw 82 during rotation, thus avoiding harm to the fish fry. The rectangular telescopic sleeves have both excellent waterproof sealing and good flexibility and tensile strength.

[0081] The total length of the drive screw 82 needs to cover the entire stroke of the screening assembly 9 as it moves from one side of the water tank 2 to the other. However, in actual screening operations, the sliding block 87 does not need to move to the extreme positions at both ends of the screw. Therefore, 3 / 4 of the maximum telescopic length can not only fully cover the effective working stroke of the sliding block 87, but also retain 1 / 4 of the redundant length when the rectangular telescopic sleeve is fully extended, avoiding material fatigue or tearing due to excessive stretching and significantly extending the service life of the telescopic sleeve.

[0082] The working principle of this invention is as follows: When screening fry of *Siniperca esculenta*, the screening component 9 is located on one side inside the water tank 2. The operator controls the adjustment motor 99 to drive the fry according to the required size of the fry. The adjustment motor 99 drives the transverse screw 95 to rotate. Since the transverse bevel gear 954 at one end of the transverse screw 95 meshes with the longitudinal bevel gear 944 at one end of the longitudinal screw 94, the longitudinal screw 94 will rotate simultaneously. Similarly, since the longitudinal bevel gear 944 of the longitudinal screw 94 meshes with the transverse bevel gear 954 of another transverse screw 95, and the transverse bevel gear 954 of another transverse screw 95 meshes with the longitudinal bevel gear 944 of another longitudinal screw 94, the two symmetrical longitudinal screws 94 and the two transverse screws 95 will rotate simultaneously.

[0083] During the rotation of the two longitudinal screws 94 and the two transverse screws 95, because the threads at both ends of the longitudinal screws 94 and the threads at both ends of the transverse screws 95 are opposite, the longitudinal sliders 942 on the two longitudinal screws 94 will slide inward simultaneously, and the transverse sliders 952 on the two transverse screws 95 will slide inward simultaneously. The longitudinal sliders 942 at both ends of the longitudinal screws 94 will simultaneously push against the longitudinal telescopic module 96 and compress the longitudinal telescopic module 96. The longitudinal telescopic column 963 on the longitudinal telescopic module 96 will slide inside the longitudinal fixed cylinder 962. At the same time, the longitudinal electromagnetic block 965 will also be energized, generating an electromagnetic field to attract the longitudinal locking block 967 to move radially inward. The longitudinal locking block 967 will compress the longitudinal second compression spring 966. At this time, with the compression and pushing of the longitudinal sliders 942, the longitudinal telescopic column 963 will enter the longitudinal fixed cylinder 962. Inside, the longitudinal first compression spring 964 inside the longitudinal fixed cylinder 962 is compressed. When the distance sensor inside the longitudinal fixed cylinder 962 detects that the longitudinal telescopic column 963 has moved to the specified position, it transmits the information to the control unit. The control unit controls the longitudinal electromagnetic block 965 to be de-energized. At this time, the magnetic field between the longitudinal electromagnetic block 965 and the longitudinal locking block 967 disappears. Through the elastic potential energy of the longitudinal second compression spring 966, the longitudinal locking block 967 is pushed to move radially outward and is locked into the first locking groove 9621 inside the longitudinal fixed cylinder 962. Since the forces on each longitudinal telescopic module 96 are different, the longitudinal locking blocks 967 inside each longitudinal telescopic module 96 will be locked into the first locking groove 9621 one after another. As the longitudinal telescopic module 96 contracts, the longitudinal rectangular block 961 will drive each mesh line 98 to move closer to each other, thereby changing the size of the screen hole.

[0084] Similarly, the transverse sliders 952 at both ends of the transverse screw 95 will simultaneously push the transverse telescopic module 97, compressing it. The transverse telescopic column 973 on the transverse telescopic module 97 will slide inside the transverse fixed cylinder 972. At the same time, the transverse electromagnetic block 975 will be energized, generating an electromagnetic field to attract the transverse locking block 977 to move radially inward. The transverse locking block 977 will compress the transverse second compression spring 976. At this time, with the squeezing and pushing of the transverse sliders 952, the transverse telescopic column 973 will enter the transverse fixed cylinder 972, compressing the transverse first compression spring 974 inside the transverse fixed cylinder 972. When the distance sensor inside the transverse fixed cylinder 972 detects the transverse telescopic column 973... After moving to the designated position, 73 transmits information to the control unit, which then controls the transverse electromagnetic block 975 to de-energize. At this time, the magnetic field between the transverse electromagnetic block 975 and the transverse locking block 977 disappears. Through the elastic potential energy of the transverse second compression spring 976, the transverse locking block 977 is pushed radially outward and locked into the second locking groove 9721 inside the transverse fixed cylinder 972. Due to the different forces on each transverse telescopic module 97, the transverse locking blocks 977 inside each transverse telescopic module 97 will be locked into the second locking groove 9721 one after another. As the transverse telescopic module 97 contracts, the transverse rectangular block 971 will drive each mesh wire 98 to move closer to each other, thereby changing the size of the screen holes.

[0085] Once the adjustment is complete, the adjusting motor 99 will stop rotating. At this time, the control unit will control the drive motor 81 to rotate, which will drive the drive screw 82 to rotate. The drive motor 81 will then drive the vertically adjacent drive screw 82 to rotate via the first pulley 83 and the first belt 84. Similarly, the second pulley 85 and the second belt 86 will drive the horizontally adjacent drive screw 82 to rotate. Finally, the first pulley 83 and the first belt 84 will drive the vertically adjacent drive screw 82 to rotate, thus making the four screws rotate synchronously. As the four drive screws 82 rotate, they will drive four sliding... Block 87 moves horizontally, causing the screening component 9 to slowly move from one side of the water tank 2 to the other side, leaving a certain gap according to the number of fry, thereby screening the fry inside the water tank 2. After screening, the control unit can control the adjusting motor 99 to continue rotating, and cause the longitudinal telescopic module 96 and the transverse telescopic module 97 to drive the mesh 98 to continue moving, so that the screen holes are adjusted to the minimum. Then, the drive motor 81 drives the sliding block 87 to move, and brings the screening component 9 to the middle of the water tank 2, dividing the water tank 2 so that two different sizes of fry can be fed in the same water tank 2.

[0086] When screening is not required, the motor 99 is adjusted to drive the longitudinal slider 942 and the transverse slider 952 to move outward. The longitudinal telescopic module 96 and the transverse telescopic module 97 will return to their original positions through the elastic potential energy of the longitudinal first compression spring 964 and the transverse first compression spring 974. At the same time, the longitudinal electromagnetic block 965 and the transverse electromagnetic block 975 are energized, causing the longitudinal locking block 967 and the transverse locking block 977 to retract, and the longitudinal telescopic column 963 and the transverse telescopic column 973 to return to their original positions. Meanwhile, the adjacent mesh lines 98 will gradually move away, causing the screen holes to expand. When the mesh lines 98 on the screening component 9 return to their initial positions, the longitudinal electromagnetic block 965 and the transverse electromagnetic block 975 will be de-energized, causing the longitudinal locking block 967 and the transverse locking block 977 to engage with the first locking slot 9621 and the second locking slot 9721, respectively. Finally, the drive motor 81 drives the drive screw 82 to rotate, thereby moving the screening component 9 to one side of the water tank 2, preparing for a screening operation.

[0087] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A screening device for raising fry of *Scoidea protuberanceis*, characterized in that, include: Support leg (1), water tank (2), support plate (3), hinge (4), cover plate (5), handle (6), water outlet pipe (7), drive assembly (8) and screening assembly (9); A water tank (2) is fixedly installed on a plurality of the support legs (1), a support plate (3) is fixedly installed on one side of the water tank (2), a plurality of cover plates (5) are hinged to the top of the water tank (2) by a plurality of hinges (4), a handle (6) is fixedly installed on each of the plurality of cover plates (5), a water outlet pipe (7) is fixedly installed on the side of the water tank (2) away from the support plate (3), the drive assembly (8) is fixedly installed on the water tank (2), and the screening assembly (9) is movably installed inside the water tank (2); The size of the sieve holes is adjusted according to the size of the fish fry by the screening component (9), and the screening component (9) is driven to move by the driving component (8) to screen fish fry of different sizes. The screening component (9) includes a rectangular shell (91), a longitudinal support (92), a transverse support (93), a longitudinal screw (94), a transverse screw (95), a longitudinal telescopic module (96), a transverse telescopic module (97), a network cable (98), and an adjustment motor (99). The rectangular shell (91) has a rectangular through hole (911) in the middle. The four corners of the rectangular shell (91) are fixedly installed with longitudinal supports (92) and transverse supports (93). A longitudinal screw (94) is rotatably installed between two adjacent longitudinal supports (92) and a transverse screw (95) is rotatably installed between two adjacent transverse supports (93). A longitudinal slider (942) is slidably installed at both ends of the longitudinal screw (94), and the two longitudinal sliders (942) are located inside the two longitudinal supports (92). A longitudinal connecting block (943) is provided on the two longitudinal sliders (942). Multiple longitudinal telescopic modules (96) are fixedly installed between the two longitudinal connecting blocks (943), and the multiple longitudinal telescopic modules (96) are fixedly connected end to end. The two ends of the transverse screw (95) are respectively slidably mounted with transverse sliders (952), and the two transverse sliders (952) are respectively located inside the two transverse supports (93). The two transverse sliders (952) are respectively provided with transverse connecting blocks (953). Multiple transverse telescopic modules (97) are respectively fixedly installed between the two transverse connecting blocks (953), and the multiple transverse telescopic modules (97) are fixedly connected end to end. Multiple network cables (98) are respectively fixedly installed between the symmetrical longitudinal telescopic modules (96) and the symmetrical transverse telescopic modules (97). The adjusting motor (99) is fixedly installed at one end of the transverse screw (95). The longitudinal telescopic module (96) includes a longitudinal rectangular block (961), a longitudinal fixed cylinder (962), a longitudinal telescopic column (963), a longitudinal first compression spring (964), a longitudinal electromagnetic block (965), a longitudinal second compression spring (966), and a longitudinal locking block (967). The inner side of the longitudinal rectangular block (961) is fixedly connected to the end of the network cable (98). A longitudinal fixing cylinder (962) is fixedly installed on the longitudinal rectangular block (961). A longitudinal telescopic column (963) is slidably installed inside the longitudinal fixing cylinder (962). A longitudinal first compression spring (964) is fixedly installed inside the longitudinal fixing cylinder (962), and the longitudinal first compression spring (964) is located at the bottom of the longitudinal telescopic column (963). Multiple first holes (9631) are arranged in a ring array around the axis on the outer circumference of the longitudinal telescopic column (963). Multiple longitudinal electromagnetic blocks (965) are fixedly installed inside the first holes (9631). Multiple longitudinal second compression springs (966) are fixedly installed inside the first holes (9631). Multiple longitudinal locking blocks (967) are slidably installed inside the first holes (9631). The lateral telescopic module (97) includes a lateral rectangular block (971), a lateral fixed cylinder (972), a lateral telescopic column (973), a lateral first compression spring (974), a lateral electromagnetic block (975), a lateral second compression spring (976), and a lateral locking block (977). The inner side of the horizontal rectangular block (971) is fixedly connected to the end of the network cable (98). A horizontal fixing cylinder (972) is fixedly installed on the horizontal rectangular block (971). A horizontal telescopic column (973) is slidably installed inside the horizontal fixing cylinder (972). A horizontal first compression spring (974) is fixedly installed inside the horizontal fixing cylinder (972), and the horizontal first compression spring (974) is located at the bottom of the horizontal telescopic column (973). Multiple second holes (9731) are arranged in a ring array around the axis on the outer circumference of the horizontal telescopic column (973). Multiple horizontal electromagnetic blocks (975) are fixedly installed inside the second holes (9731). Multiple horizontal second compression springs (976) are fixedly installed inside the second holes (9731). Multiple horizontal locking blocks (977) are slidably installed inside the second holes (9731).

2. The culture and screening device for *Siniperca scutellarioides* fry as described in claim 1, characterized in that: The two longitudinal screws (94) are respectively provided with longitudinal limiting blocks (941) in the middle part, and the thread directions on both sides of the longitudinal limiting blocks (941) are opposite. The two transverse screws (95) are respectively provided with transverse limiting blocks (951) in the middle part, and the thread directions on both sides of the transverse limiting blocks (951) are opposite.

3. The culture and screening device for *Siniperca scutellarioides* fry as described in claim 1, characterized in that: The two longitudinal screws (94) are respectively provided with longitudinal bevel gears (944) at their three ends, and the two transverse screws (95) are respectively provided with transverse bevel gears (954) at their three ends, and the longitudinal bevel gears (944) of the adjacent longitudinal screws (94) mesh with the transverse bevel gears (954) of the transverse screws (95).

4. The culture and screening device for *Siniperca scutellarioides* fry as described in claim 1, characterized in that: The inner wall of the longitudinal fixing cylinder (962) is provided with a plurality of first slots (9621) along the axis, and the first slots (9621) cooperate with the longitudinal locking block (967). The inner wall of the transverse fixing cylinder (972) is provided with a plurality of second slots (9721) along the axis, and the second slots (9721) cooperate with the transverse locking block (977).

5. The culture and screening device for *Siniperca scutellarioides* fry as described in claim 4, characterized in that: Distance sensors are fixedly installed at the bottom of the longitudinal fixed cylinder (962) and the bottom of the transverse fixed cylinder (972).

6. The culture and screening device for *Siniperca scutellarioides* fry as described in claim 1, characterized in that: The drive assembly (8) includes a drive motor (81), a drive screw (82), a first pulley (83), a first belt (84), a second pulley (85), a second belt (86), and a sliding block (87). The drive motor (81) is fixedly mounted on the support plate (3). The four drive screws (82) are respectively installed inside the water tank (2) in parallel rotation. One end of each of the four drive screws (82) passes through one side of the water tank (2). One end of any one of the drive screws (82) located below the outside of the water tank (2) is fixedly connected to the drive motor (81). The ends of the four drive screws (82) located outside the water tank (2) are respectively fixedly mounted with first rotating wheels (83). Two vertically adjacent first rotating wheels (83) are fixedly mounted with first rotating wheels (83). 3) Two drive screws (82) located above the outside of the water tank (2) are connected by the first belt (84) and two second rotating wheels (85) are fixedly installed on them respectively. The two second rotating wheels (85) are located outside the two first rotating wheels (83). The two second rotating wheels (85) are connected by the second belt (86). Sliding blocks (87) are slidably installed on the four drive screws (82) located inside the water tank (2). The four sliding blocks (87) are fixedly connected to the four corners of the rectangular shell (91) respectively.

7. The culture and screening device for *Siniperca scutellarioides* fry as described in claim 6, characterized in that: Each of the four sliding blocks (87) is fitted with a sealed rectangular telescopic sleeve on both sides, and the maximum telescopic length of the rectangular telescopic sleeve is 3 / 4 of the length of the drive screw (82).

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