A freshwater fish sorting device

Abstract

The present application discloses a freshwater fish sorting device, which relates to the technical field of fish sorting, and comprises a box body, a fish outlet, an isolation component, a driving component and a propeller flow pushing mechanism, wherein the isolation component is rotatably connected with a plurality of partitions in the vertical direction, and a vibrator is fixed inside each partition, and a slide groove 1 and a slide groove 2 are provided on the outer edges of both sides of the length direction of the top opening of the box body, and a track groove is provided on the bottom side wall of the box body, and an installation groove is provided at one end of the slide groove 2 close to the isolation component, the isolation component is installed in the installation groove and the slide groove 1, and the driving component is slidably connected in the track groove, the slide groove 1 and the slide groove 2; the driving component comprises a fish screening plate, a deformation ring, a fish screening net plate and a crossbeam, and the fish screening net plate is elastically connected to the fish screening plate through the deformation ring; and the technical effect of being able to buffer the collision of large fish while the screen moves to sort the fry, thereby reducing the risk of the fry being injured is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of fish sorting, in particular to a live fish sorting device for freshwater fisheries. Background Art

[0002] Freshwater fishery refers to the industry of fish farming in freshwater environments such as rivers, lakes, reservoirs, ponds, etc. It is an important part of my country's fishery and is of great significance for ensuring national food safety, promoting farmers' income growth, and maintaining ecological balance. Live fish sorting is an important part of freshwater aquaculture. The main purpose is to classify fish according to their size, variety, health status, etc., for subsequent management and sales. In freshwater fisheries, in the process of fry cultivation, it is necessary not only to reasonably control the growth temperature and hydrological conditions of fry, but also to sort fry of different sizes in a timely manner. Weak activity, narrow feeding range, and uneven feeding are the main reasons for the difference in the size of fry. When the size difference of fry is large, if the large fry and small fry are not sorted in time, the small fry will not be able to compete with the healthy fry after feeding, and the small fry will become smaller and smaller, making the final fry in the breeding box have a large difference in the size of the fry, and in severe cases, it will lead to the death of the small fry. In the prior art, a Chinese patent with authorization announcement number CN110326578B discloses a fry sorting box, including a box body, a driving component and an isolation component installed in the box body, a chute 1 and a chute 2 are provided on the outer edges of both sides of the box body, a track groove is provided on the bottom side wall of the box body, an isolation component mounting groove is provided at the top of the chute 2, the isolation component is installed in the isolation component mounting groove and the chute 1, the driving component is installed in the track groove, the chute 1 and the chute 2, and a screen is installed on the driving component, so that fry of different sizes can be sorted.

[0003] The above-mentioned fry sorting box can compress the space between the isolation part and the driving part by pushing the driving part, so that the small fry can pass through the screen, and when the driving part moves to a certain position toward the isolation part, the partition of the isolation part is opened, so that the large fry can pass through the isolation part, thereby separating the large and small fry. However, during use, the driving part constantly approaches the isolation part, and the activity space of the large fry is constantly compressed during the approach, so that the large fry can easily hit the screen, and the screen is easily damaged and the large fry are injured. At the same time, the small fry constantly move closer to the screen. With the movement of the screen and the struggle of the fry, congestion is likely to occur near the screen, which may lead to low efficiency in fry sorting. Summary of the invention

[0004] The embodiment of the present application provides a freshwater fishery live fish sorting device, which solves the technical problem of the prior art that the screen is easily damaged and causes injury to large fish when sorting fry, and achieves the technical effect of being able to buffer the collision of large fish while moving the screen to sort the fry, thereby reducing the risk of injury to the fry.

[0005] The embodiment of the present application provides a freshwater fish sorting device, comprising a box body, two fish outlets, an isolation component, a driving component and a propeller flow-pushing mechanism, wherein the propeller flow-pushing mechanism is fixed to the inner wall of the box body near the isolation component, and the output direction of the propeller flow-pushing mechanism is toward the isolation component, which is used to control the flow direction of water inside the box body, so that the water flows from the isolation component to the driving component; the isolation component is rotatably connected with a plurality of partitions in the vertical direction, and a vibrator is fixed inside the partitions, and the partitions control the opening and closing of the isolation component by rotation, and the vibrator is used to drive the fry to move closer to the driving component; a chute 1 and a chute 2 are provided on the outer edges of both sides of the length direction of the top opening of the box body, a track groove is provided on the bottom side wall of the box body, and an installation groove is provided at one end of the chute 2 near the isolation component, the isolation component is installed in the installation groove and the chute 1, and the driving component is slidably connected to the track groove, the chute 1 and the chute 2; the driving component comprises a fish screening plate, a deformation ring, a fish screening net plate and a crossbeam, and the fish screening net plate is elastically connected to the fish screening plate through the deformation ring.

[0006] Preferably, both the isolation component and the driving component are arranged vertically, and the two divide the internal space of the box into three parts in the length direction, the crossbeam is horizontally fixed to the top of the fish screening plate, and two handles are symmetrically fixed at both ends of the crossbeam. A circular fish screening groove is provided in the middle of the fish screening plate, and the deformation circle is annular as a whole, an outer ring of the deformation circle is fixedly connected to the fish screening groove, and an inner ring of the deformation circle is connected to the fish screening net disk, the deformation circle is made of elastic rubber material, the fish screening net disk is disc-shaped, and a plurality of fish screening holes are provided on the fish screening net disk.

[0007] Preferably, the propeller flow-pushing mechanism comprises a box body, a motor is fixed inside the box body, a propeller blade is fixed at the output end of the motor, and an opening of the box body is closed by a metal mesh.

[0008] Preferably, a magnetic ring is fixed around the inner ring of the deformation circle, and the magnetic ring is a circular ring with a size matching the fish screening net disk. Multiple magnetic rings are coaxially arranged, and the opposite surfaces of the multiple magnetic rings are magnetically attracted to each other. A telescopic fish screen is fixed between every two adjacent magnetic rings, and the magnetic ring farthest from the deformation circle is fixedly connected to the fish screening net disk.

[0009] Preferably, the telescopic fish screen is cylindrical, the telescopic fish screen is made of elastic rubber material, and a plurality of fish screening side holes are opened on the side wall of the telescopic fish screen; the size of the fish screening side holes on the plurality of telescopic fish screens decreases gradually from the side close to the fish screening slot to the side far away from the fish screening slot, wherein the size of the fish screening side hole closest to the fish screening net plate is larger than the size of the fish screening hole; the magnetic force between the opposite surfaces of the plurality of magnetic circles decreases gradually from the side close to the fish screening slot to the side far away from the fish screening slot; initially, the plurality of magnetic circles are magnetically attracted to each other, and the plurality of telescopic fish screens are in a contracted state.

[0010] Preferably, the magnetic circle includes a first magnetic circle, a second magnetic circle and a third magnetic circle, the first magnetic circle is fixedly connected to the deformation circle, the second magnetic circle is located between the first magnetic circle and the third magnetic circle, and the magnetic force between the opposing surfaces of the first magnetic circle and the second magnetic circle is greater than the magnetic force between the opposing surfaces of the second magnetic circle and the third magnetic circle.

[0011] Preferably, the size of the fish screening side hole between the first magnetic circle and the second magnetic circle is larger than the size of the fish screening side hole between the second magnetic circle and the third magnetic circle, and the size of the fish screening side hole between the second magnetic circle and the third magnetic circle is larger than the size of the fish screening hole.

[0012] Preferably, the telescopic fish screen is a double-layer structure, and a fluid cavity is opened inside the double layer of the telescopic fish screen, and the fluid cavity is filled with electrorheological fluid.

[0013] Preferably, in the opposite surfaces between two adjacent magnetic circles, one of the magnetic circles is fixed with a pull switch, a pull rope is fixed on the pull switch, the pull rope is located in the fluid cavity, the other end of the pull rope is fixed to the side wall of the other opposite magnetic circle, and one of the magnetic circles is embedded with multiple powered contacts.

[0014] Preferably, the plurality of energized contacts are evenly distributed along a circular circumference of the magnetic ring; the energized contacts are interrelated with the tension switch. Initially, the tension switch is in a normally closed state. When the telescopic fish screen is fully unfolded, the pull rope is straightened, and at the same time, the pull rope pulls the tension switch to turn on the tension switch. The tension switch controls the energized contacts to be energized, and the energized contacts cause current to flow through the electrorheological fluid, which hardens the electrorheological fluid, thereby hardening the telescopic fish screen as a whole.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] The cooperation of the propeller flow-pushing mechanism, the isolating component and the driving component unifies the flow direction of the water, so that the body of the smaller fry is perpendicular to the fish screening net plate, thereby reducing the risk of the fry being parallel to the fish screening net plate and causing the sieve holes to be blocked, and at the same time, it plays a certain protective role for the fry; by arranging a deformation circle in the driving component, the deformation circle is deformed into a truncated cone shape by the water flow, so that when the larger fry hits the fish screening net plate, the fish screening net plate has a margin of elastic buffering, and at the same time, the water flow forms a vortex at the rear end of the driving component, thereby quickly spreading the fry passing through the fish screening holes, so that the fry behind can swim faster and are not easy to cause congestion, thereby solving the technical problem of the prior art that the screen is easily damaged and causes big fish to be injured when sorting fry, and achieving the technical effect of being able to buffer the collision of big fish while the screen moves to sort the fry, thereby reducing the risk of fry injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a top view of the structure of Embodiment 1 of the present invention;

[0018] Figure 2 It is a side view schematic diagram of a driving component of Embodiment 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of a driving component in Embodiment 1 of the present invention;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of a driving component according to a second embodiment of the present invention;

[0021] Figure 5 This is a front view structural diagram of a driving component of Embodiment 2 of the present invention;

[0022] Figure 6 This is a schematic diagram of a fluid chamber according to a third embodiment of the present invention;

[0023] Figure 7 It is a schematic cross-sectional view of the telescopic fish screen according to embodiment 3 of the present invention.

[0024] In the figure:

[0025] Box body 100; chute one 110; chute two 120; fish outlet 130; isolation component 200; partition 210; driving component 300; crossbeam 310; handle 311; fish screening plate 320; fish screening slot 321; deformation circle 330; fish screening net plate 340; fish screening hole 341; first magnetic circle 350; second magnetic circle 360; third magnetic circle 370; telescopic fish screen 380; fish screening side hole 381; fluid cavity 382; power contact 383; pull rope 384; tension switch 385; propeller flow mechanism 400. DETAILED DESCRIPTION

[0026] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0027] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Embodiment 1: Figures 1 to 3 As shown, the present application is a freshwater fish sorting device, comprising a box 100, two fish outlets 130 opened on both sides of the box 100 in the length direction, an isolation component 200, a driving component 300 and a propeller flow-pushing mechanism 400, wherein the isolation component 200 and the driving component 300 are both arranged vertically, and the two divide the internal space of the box 100 into three parts in the length direction, the propeller flow-pushing mechanism 400 is fixed to the inner wall of the box 100 close to the isolation component 200, and the output direction of the propeller flow-pushing mechanism 400 is toward the isolation component 200, which is used to control the flow direction of the water flow inside the box 100, so that the water flows from the isolation component 200 to the driving component 300; the isolation component 200 is rotatably connected to a plurality of partitions 210 in the vertical direction, and the partitions 210 are connected to the isolation component 200. 10 is fixed with a vibrator inside, the partition 210 controls the opening and closing of the isolation component 200 by rotation, and the vibrator is used to drive the fry to move closer to the driving component 300; the outer edges of the top opening of the box body 100 on both sides in the length direction are provided with a slide groove 110 and a slide groove 2 120, and the bottom side wall of the box body 100 is provided with a track groove, and the end of the slide groove 2 120 close to the isolation component 200 is provided with a mounting groove, the isolation component 200 is installed in the mounting groove and the slide groove 110, and the driving component 300 is slidably connected to the track groove, the slide groove 110 and the slide groove 2 120; the driving component 300 includes a fish screening plate 320, a deformation ring 330, a fish screening net plate 340 and a crossbeam 310, and the fish screening net plate 340 is elastically connected to the fish screening plate 320 through the deformation ring 330.

[0030] The crossbeam 310 is horizontally fixed on the top of the fish screening plate 320, and two handles 311 are symmetrically fixed at both ends of the crossbeam 310. A circular fish screening groove 321 is provided in the middle of the fish screening plate 320. The deformation ring 330 is annular as a whole. The outer ring of the deformation ring 330 is fixedly connected to the fish screening groove 321, and the inner ring of the deformation ring 330 is connected to the fish screening net plate 340. The deformation ring 330 is made of elastic rubber material, and the fish screening net plate 340 is disc-shaped. A plurality of fish screening holes 341 are provided on the fish screening net plate 340, and the fish screening holes 341 are used to allow smaller fry to pass through to the other side of the driving component 300.

[0031] When sorting fry, the user rotates the partition 210 to open the isolation component 200, and turns on the propeller flow mechanism 400 and the vibrator. Figure 1 As shown by the middle arrow, the water flows from the isolation component 200 to the driving component 300, and at the same time, the vibration of the vibrator and the water flow cause the fry to swim in the direction of the driving component 300. At this time, the user holds the handle 311 to slide the driving component 300 along the chute 1 10 and the chute 2 120 in the direction of the isolation component 200, and the deformation ring 330 is deformed to the side away from the isolation component 200 under the push of the water flow and the fry, so as to buffer the fish screening net plate 340. At the same time, since the deformation ring 330 is formed into a truncated cone after deformation, the space around it can cause the water flow to form a vortex on the side of the driving component 300 away from the isolation component 200 (such as Figure 1 The fry are spread around the deformation circle 330, thereby reducing the risk of the fry being crowded near the fish screening net plate 340.

[0032] The propeller flow-pushing mechanism 400 comprises a box body, a motor is fixed inside the box body, a propeller blade is fixed at the output end of the motor, and an opening of the box body is closed by a metal mesh.

[0033] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0034] In this embodiment, the propeller flow mechanism 400, the isolation component 200 and the driving component 300 cooperate to unify the flow direction of the water flow, so that the body of the smaller fry is perpendicular to the fish screening net plate 340, thereby reducing the risk of the fry being parallel to the fish screening net plate 340 and causing the fish screening holes 341 to be blocked, and at the same time, it plays a certain protective role for the fry; by arranging a deformation circle 330 in the driving component 300, the deformation circle 330 is deformed into a truncated cone shape by using the water flow, so that when there are larger fry, When the fish screening net plate 340 is hit, the fish screening net plate 340 has a margin of elastic buffering, and at the same time, the water flow forms a vortex at the rear end of the driving component 300, thereby quickly spreading the fry passing through the fish screening holes 341, so that the fry behind can swim faster and are not easy to cause congestion, thereby solving the technical problem of the prior art that the screen is easily damaged and causes big fish injuries when sorting fry, and achieving the technical effect of being able to buffer the collision of big fish while the screen moves to sort the fry, thereby reducing the risk of fry injuries.

[0035] Embodiment 2: Considering that in the above-mentioned embodiment 1, since the deformation circle 330 is in the fish screening groove 321, the size of the deformation circle 330 is limited. Therefore, when the user moves the driving component 300 faster or the water flow is faster, the deformation amount of the deformation circle 330 is difficult to meet the swimming speed of the fry school. At the same time, when the user needs to finely classify the fry of different sizes, it is often necessary to constantly replace the fish screening net plates 340 of different specifications. Therefore, it is necessary to improve the device. At the same time, when sorting larger fry, the required water flow rate is also greater to ensure that the fry swim into the driving component 300 instead of being passively approached by the driven component 300. Therefore, the water flow rates of different sizes can accurately control the swimming of fry of different sizes. Figure 4 and Figure 5 As shown, the specific structure of this embodiment is as follows:

[0036] A magnetic ring is fixed around the inner ring of the deformation ring 330, and the magnetic ring is a circular ring with a size matching that of the fish screening net disk 340. A plurality of magnetic rings are coaxially arranged, and the opposite surfaces of the plurality of magnetic rings are magnetically attracted to each other. A telescopic fish screen 380 is fixed between every two adjacent magnetic rings, and the magnetic ring farthest from the deformation ring 330 is fixedly connected to the fish screening net disk 340 around the circle; the telescopic fish screen 380 is cylindrical, and the telescopic fish screen 380 is made of elastic rubber material, and a plurality of fish screening side holes 381 are opened on the side wall of the telescopic fish screen 380; the size of the fish screening side holes 381 on the plurality of telescopic fish screens 380 is gradually reduced from the side close to the fish screening slot 321 to the side away from the fish screening slot 321, wherein the size of the fish screening side hole 381 closest to the fish screening net disk 340 is larger than the size of the fish screening hole 341; the magnetic force between the opposite surfaces of the plurality of magnetic rings is gradually reduced from the side close to the fish screening slot 321 to the side away from the fish screening slot 321.

[0037] Initially, the multiple magnetic circles are magnetically attracted to each other, and the multiple telescopic fish screens 380 are in a retracted state. When the water flow rate continues to increase under the drive of the propeller flow-pushing mechanism 400, the magnetic circles are separated in sequence according to the size of the magnetic force. Therefore, the higher the water flow rate, the larger the size of the fish screening side holes 381 on the unfolded telescopic fish screen 380. Then, by controlling the power of the propeller flow-pushing mechanism 400, it is possible to achieve a tiered sorting of fish fry of different sizes from large to small. At the same time, when the fish screening net plate 340 is subjected to a large pressure, the retractable fish screen 380 is expanded backward to release the pressure of the fish screening net plate 340 and the deformation circle 330, and at the same time, the problem of fish fry congestion is further alleviated, and the efficiency of sorting fish fry is improved. The user does not need to frequently manually replace the fish screening net plate 340 to achieve the sorting of fish fry of different sizes. The user can first set a smaller water flow to allow the smallest fish fry to pass through the fish screening hole 341, and after collecting the smallest fish fry, increase the water flow rate to allow the fish screening side holes 381 of different sizes to expand in turn, thereby achieving accurate sorting.

[0038] Furthermore, the magnetic circle comprises a first magnetic circle 350, a second magnetic circle 360 ​​and a third magnetic circle 370, the first magnetic circle 350 is fixedly connected to the deformation circle 330, the second magnetic circle 360 ​​is located between the first magnetic circle 350 and the third magnetic circle 370, the magnetic force between the opposing surfaces of the first magnetic circle 350 and the second magnetic circle 360 ​​is greater than the magnetic force between the opposing surfaces of the second magnetic circle 360 ​​and the third magnetic circle 370, the size of the fish screening side hole 381 between the first magnetic circle 350 and the second magnetic circle 360 ​​is greater than the size of the fish screening side hole 381 between the second magnetic circle 360 ​​and the third magnetic circle 370, and the size of the fish screening side hole 381 between the second magnetic circle 360 ​​and the third magnetic circle 370 is greater than the size of the fish screening hole 341.

[0039] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0040] This embodiment provides a plurality of magnetic rings with different magnetic forces and a telescopic fish screen 380, and utilizes the water flow velocity to change the orientation of fry of different sizes, while further alleviating the pressure of the fish screen net plate 340, and utilizes the gradually increasing size of the fish screen side holes 381 to accurately sort fry of different sizes, thereby reducing the labor intensity of the user and improving the efficiency of fry sorting.

[0041] Embodiment 3: Considering that the telescopic fish screen 380 in the above embodiment 2 is made of elastic material, when the number of telescopic fish screens 380 deployed is large, due to the long overall length, when the fry in the water flow struggle, the overall shape of the telescopic fish screen 380 may become irregular, which may increase the resistance of the user to push the handle 311, causing certain troubles to the user. Secondly, if the overall shape of the telescopic fish screen 380 changes irregularly, it may cause the speed of the fry passing through the sieve side holes 381 and the sieve holes 341 to decrease, thereby affecting the efficiency of the device in sorting fry. Therefore, the device needs to be improved, such as Figure 6 and Figure 7 As shown, the specific structure is as follows:

[0042] The telescopic fish screen 380 is a double-layer structure, and a fluid cavity 382 is opened inside the double layer of the telescopic fish screen 380. The fluid cavity 382 is filled with electrorheological fluid. When the electrorheological fluid is energized, the viscosity of the electrorheological fluid increases rapidly, thereby driving the telescopic fish screen 380 to harden as a whole. The electrorheological fluid is a prior art, so it is not described in detail.

[0043] On the opposite sides of two adjacent magnetic circles, a pull switch 385 is fixed to one of the magnetic circles, a pull rope 384 is fixed to the pull switch 385, the pull rope 384 is located in the fluid cavity 382, ​​the other end of the pull rope 384 is fixed to the side wall of the other opposite magnetic circle, and a plurality of power contacts 383 are embedded on one of the magnetic circles, such as Figure 7 As shown, the plurality of energized contacts 383 are evenly distributed along the circular circumference of the magnetic ring; the energized contacts 383 are associated with the tension switch 385. Initially, the tension switch 385 is in a normally closed state. When the telescopic fish screen 380 is fully unfolded, the pull rope 384 is straightened, and at the same time, the pull rope 384 pulls the tension switch 385 to turn on the tension switch 385. The tension switch 385 controls the energized contacts 383 to be energized. The energized contacts 383 allow current to flow through the electrorheological fluid, which hardens the electrorheological fluid, thereby hardening the telescopic fish screen 380 as a whole.

[0044] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0045] In this embodiment, a fluid cavity 382 is provided, and an electrorheological fluid and a pull rope 384 are provided in the fluid cavity 382. The pull rope 384 is pulled by the expansion of the telescopic fish screen 380, so that the pull rope 384 turns on the tension switch 385, thereby hardening the telescopic fish screen 380 as a whole, ensuring the stability of the screening process, avoiding the possibility that the fry may have difficulty passing through the side holes 381 due to the irregular deformation of the telescopic fish screen 380, and avoiding the possibility that larger fry may squeeze into the side holes 381 due to the elastic force of the telescopic fish screen 380.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A freshwater fish sorting device, characterized in that: The invention comprises a box body (100), two fish outlets (130), an isolation component (200), a driving component (300) and a propeller flow-pushing mechanism (400), wherein the propeller flow-pushing mechanism (400) is fixed to a side of an inner wall of the box body (100) close to the isolation component (200), and an output direction of the propeller flow-pushing mechanism (400) is toward the isolation component (200), and is used to control the flow direction of water inside the box body (100), so that the water flows from the isolation component (200) to the driving component (300); the isolation component (200) is vertically rotatably connected to the driving component (300) A partition (210) is provided, and a vibrator is fixed inside each of the partitions (210). The partition (210) controls the opening and closing of the isolation component (200) by rotating, and the vibrator is used to drive the fry to move closer to the driving component (300); a first slide groove (110) and a second slide groove (120) are provided on the outer edges of both sides of the length direction of the top opening of the box body (100), and a track groove is provided on the bottom side wall of the box body (100). An installation groove is provided at one end of the second slide groove (120) close to the isolation component (200), and the isolation component (200) is installed in the installation groove and the first slide groove (110). ), the driving component (300) is slidably connected to the track groove, the first slide groove (110) and the second slide groove (120); the driving component (300) includes a fish screening plate (320), a deformation ring (330), a fish screening net plate (340) and a crossbeam (310), and the fish screening net plate (340) is elastically connected to the fish screening plate (320) through the deformation ring (330); the isolation component (200) and the driving component (300) are both arranged vertically, and the two divide the internal space of the box body (100) into three parts in the length direction, and the crossbeam (310) is horizontally The fish screening plate (320) is fixed on the top, and two handles (311) are symmetrically fixed at both ends of the crossbeam (310). A circular fish screening groove (321) is provided in the middle of the fish screening plate (320). The deformation ring (330) is annular as a whole. An outer ring of the deformation ring (330) is fixedly connected to the fish screening groove (321), and an inner ring of the deformation ring (330) is connected to the fish screening net plate (340). The deformation ring (330) is made of elastic rubber material. The fish screening net plate (340) is disc-shaped, and a plurality of fish screening holes (341) are provided on the fish screening net plate (340).

2. The freshwater fishery live fish sorting device according to claim 1, characterized in that: The propeller flow-pushing mechanism (400) comprises a box body, a motor is fixed inside the box body, a propeller blade is fixed at the output end of the motor, and an opening of the box body is closed by a metal mesh.

3. The freshwater fishery live fish sorting device according to claim 1, characterized in that: A magnetic ring is fixed around the inner ring of the deformation ring (330), the magnetic ring is a circular ring with a size matching that of the fish screening net disk (340), a plurality of the magnetic rings are coaxially arranged, the opposite surfaces of the plurality of magnetic rings are magnetically attracted to each other, a telescopic fish screen (380) is fixed between every two adjacent magnetic rings, and a magnetic ring farthest from the deformation ring (330) is fixedly connected to the fish screening net disk (340) around the ring.

4. The freshwater fish sorting device according to claim 3, characterized in that: The telescopic fish screen (380) is cylindrical and made of elastic rubber. A plurality of fish screening side holes (381) are provided on the side wall of the telescopic fish screen (380). The sizes of the fish screening side holes (381) on the plurality of telescopic fish screens (380) are gradually reduced from a side close to the fish screening slot (321) to a side far from the fish screening slot (321), wherein the size of the fish screening side holes (381) closest to the fish screening net plate (340) is larger than the size of the fish screening holes (341). The magnetic force between the opposite surfaces of the plurality of magnetic circles is gradually reduced from a side close to the fish screening slot (321) to a side far from the fish screening slot (321). Initially, the plurality of magnetic circles are magnetically attracted to each other, and the plurality of telescopic fish screens (380) are all in a contracted state.

5. The freshwater fishery live fish sorting device according to claim 4, characterized in that: The magnetic ring comprises a first magnetic ring (350), a second magnetic ring (360) and a third magnetic ring (370); the first magnetic ring (350) is fixedly connected to the deformation ring (330); the second magnetic ring (360) is located between the first magnetic ring (350) and the third magnetic ring (370); and the magnetic force between the opposing surfaces of the first magnetic ring (350) and the second magnetic ring (360) is greater than the magnetic force between the opposing surfaces of the second magnetic ring (360) and the third magnetic ring (370).

6. The freshwater fishery live fish sorting device according to claim 5, characterized in that: The size of the fish screening side hole (381) between the first magnetic circle (350) and the second magnetic circle (360) is larger than the size of the fish screening side hole (381) between the second magnetic circle (360) and the third magnetic circle (370), and the size of the fish screening side hole (381) between the second magnetic circle (360) and the third magnetic circle (370) is larger than the size of the fish screening hole (341).

7. The freshwater fishery live fish sorting device according to claim 4, characterized in that: The telescopic fish screen (380) is a double-layer structure, and a fluid cavity (382) is provided inside the double-layer of the telescopic fish screen (380), and the fluid cavity (382) is filled with an electrorheological fluid.

8. The freshwater fishery live fish sorting device according to claim 7, characterized in that: On the opposite surfaces between two adjacent magnetic circles, a pull switch (385) is fixed to one of the magnetic circles, a pull rope (384) is fixed to the pull switch (385), the pull rope (384) is located in the fluid cavity (382), the other end of the pull rope (384) is fixed to the side wall of another opposite magnetic circle, and a plurality of power contacts (383) are embedded on one of the magnetic circles.

9. The freshwater fishery live fish sorting device according to claim 8, characterized in that: The plurality of energized contacts (383) are evenly distributed along a ring of the magnetic ring; the energized contacts (383) are associated with a tension switch (385); initially, the tension switch (385) is in a normally closed state; when the telescopic fish screen (380) is fully unfolded, the pull rope (384) is straightened, and at the same time, the pull rope (384) pulls the tension switch (385), so that the tension switch (385) is turned on; the tension switch (385) controls the energized contacts (383) to be energized, and the energized contacts (383) cause current to flow through the electrorheological fluid, so that the electrorheological fluid hardens, thereby hardening the telescopic fish screen (380) as a whole.

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