Non-destructive classification device and classification method for fish fry

Abstract

The invention discloses a non-destructive classification device and a classification method for fish fry, comprising a box body with an upper opening, a light source arranged above the box body, a fry entrance arranged on the right part of the box body, a horizontal partition arranged in the box body on the left side of the fry entrance, a vertical partition extending frontward and rearward arranged in the upper part of the box body on the left side of the fry entrance, N rows of small fry escape mechanism groups and N rows of large fry escape mechanism groups arranged on the horizontal partition, N≥2; the small fry escape mechanism groups and the large fry escape mechanism groups are arranged alternately; the invention has the characteristics of being able to separate large fry and small fry above the box body at the same time, and effectively avoiding damage to the fry caused by too long hypoxia time.

Description

Technical Field

[0001] The invention relates to the technical field of fish seed classification, and in particular to a non-destructive classification device and a classification method for fish seed. Background Art

[0002] In the breeding of guppy fry, when the fry are of different sizes, the large fry will cause harm to the small fry, and they need to be sorted in time. However, the cost of manual sorting is high and it is easy to cause injury to the fry. When the traditional screen method is used for sorting, the fry are easily scratched or stuck when passing through the screen holes. Summary of the invention

[0003] The invention aims to overcome the drawback that the fry of guppy fish are easily injured during the classification process, and provides a non-destructive classification device and classification method for fish fry.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A non-destructive classification device for fish fry, comprising a box with an upper opening, a light source arranged above the box, a fry entrance arranged on the right part of the box, a horizontal partition arranged in the box on the left side of the fry entrance, a vertical partition extending frontward and rearward arranged in the upper part of the box on the left side of the fry entrance, N rows of small fry escape mechanism groups and N rows of large fry escape mechanism groups arranged on the horizontal partition, N ≥ 2; the small fry escape mechanism groups and the large fry escape mechanism groups are arranged alternately;

[0006] The small fry escape mechanism group includes 2M small fry escape mechanisms arranged at intervals, M small fry escape mechanisms are located at the left part of the horizontal partition, and another M small fry escape mechanisms are located at the right part of the horizontal partition, M≥5;

[0007] The large fry escape mechanism group includes 2L large fry escape mechanisms arranged at intervals, L large fry escape mechanisms are located on the left side of the horizontal partition, and another L large fry escape mechanisms are located on the right side of the horizontal partition, L ≥ 3;

[0008] A guide groove for guiding the small fish fry on the right into the small fish fry on the left is provided on the horizontal partition corresponding to the small fish fry escape mechanism group, and a guide groove for guiding the large fish fry on the left into the large fish fry on the right is provided on the horizontal partition corresponding to the large fish fry escape mechanism group;

[0009] The guide groove for small fry to flow in and the guide groove for large fry to flow in are both in the shape of a lying right-angled trapezoid; the cross-sectional area of ​​the guide groove for small fry to flow in gradually increases from right to left, and the cross-sectional area of ​​the guide groove for large fry to flow in gradually increases from left to right; the lower end of the vertical partition is respectively connected to the upper left end of each small fry to flow in guide groove and the upper right end of each large fry to flow in guide groove, the box body on the left side of the vertical partition forms an upper left box body space, the box body on the right side of the vertical partition and on the left side of the fry entrance forms an upper right box body space, and the lower part of the horizontal partition is connected to the lower end of the fry entrance to form a lower box body space.

[0010] The fry of guppy has a remarkable characteristic, that is, it is very sensitive to the oxygen content in the water body, but the suffocation point is low and it is not easy to die. In still water with low oxygen content, the fry of guppy will float to the water surface and have phototropism. The present invention utilizes the above habits of guppy, and utilizes various small fry escape mechanisms, large fry escape mechanisms, small fry confluence guide grooves and large fry confluence guide grooves to complete the classification of fry according to size. At the same time, the present invention is also suitable for classifying fry with the same habits.

[0011] Preferably, the small fry escape mechanism includes a horizontal rectangular frame, two left fixed plates respectively arranged at the left front and left rear parts of the lower surface of the horizontal rectangular frame, and two right fixed plates respectively arranged at the right front and right rear parts of the lower surface of the horizontal rectangular frame, the two left fixed plates are provided with a left longitudinal axis, the two right fixed plates are provided with a right longitudinal axis, the left longitudinal axis is provided with a left movable flap, and the right longitudinal axis is provided with a right movable flap; the lower ends of the left movable flap and the right movable flap are both connected to the first reset pendant through a first suspension rope; when the left movable flap and the right movable flap are in a naturally flipped state, the width of the first light-transmitting gap between the upper ends of the left movable flap and the right movable flap is a, the size of the small fry is b, and the size of the large fry is c, c>a>b.

[0012] a>b, so that the small fish fry can easily pass through the first light-transmitting gap from bottom to top. Even if the small fish fry touches the upper end of the left movable flap or the upper end of the right movable flap, the upper end of the left movable flap will open to the left and the right movable flap will open to the right, and the small fish fry will smoothly pass through the first light-transmitting gap from bottom to top and enter the top of the horizontal partition.

[0013] Preferably, the left movable flap and the right movable flap are symmetrical structures, the left movable flap comprises a vertical plate with an upper end extending into a horizontal rectangular frame and an inclined plate arranged at the upper end of the vertical plate and gradually inclined upward from left to right, the lower right portion of the vertical plate is arched to the right in an arc shape, and the middle portion of the vertical plate is rotatably connected to the left fixed shaft; when the left movable flap and the right movable flap are in a natural flipping state, the distance between the lower right portion of the vertical plate of the left movable flap and the lower left portion of the vertical plate of the right movable flap is d, a<d<c.

[0014] Under the action of the first lifting rope and the first reset pendant, the movable flap and the right movable flap are in a naturally flipped state. The small fish fry are small in size and cannot touch the lower right part of the vertical plate of the left movable flap and the lower left part of the vertical plate of the right movable flap at the same time. The upper end of the left movable flap and the upper end of the right movable flap are in an open state, and the small fish fry can smoothly pass through the first light-transmitting gap from bottom to top.

[0015] The large fish fry is large in size. When the large fish fry passes through the lower right part of the vertical plate of the left movable flap and the lower left part of the vertical plate of the right movable flap, the large fish fry simultaneously touches the lower right part of the vertical plate of the left movable flap and the lower left part of the vertical plate of the right movable flap, so that the openings at the upper end of the left movable flap and the upper end of the right movable flap are closed, and the large fish fry cannot pass through the gap between the upper end of the left movable flap and the upper end of the right movable flap.

[0016] Preferably, the large fry escape mechanism includes a front slide plate, a rear slide plate, a left baffle plate arranged between the left end of the front slide plate and the left end of the rear slide plate, a right baffle plate arranged between the right end of the front slide plate and the right end of the rear slide plate, a left opening and closing plate and a right opening and closing plate arranged between the front slide plate and the middle of the rear slide plate, a left sealing plate arranged between the left part of the lower surface of the front slide plate and the rear slide plate, and a right sealing plate arranged between the right part of the lower surface of the front slide plate and the rear slide plate; a left sealing plate groove and a right sealing plate groove are arranged in the horizontal partition plate, the left part of the left sealing plate extends into the left sealing plate groove, and the left spring arranged in the left sealing plate groove contacts with the left edge of the left sealing plate; the right part of the right sealing plate extends into the right sealing plate groove, and is arranged in the right sealing plate groove The right spring in the middle contacts with the right edge of the right sealing plate; a left front fixed plate and a right front fixed plate are provided on the lower surface of the front slide plate, and a left rear fixed plate and a right rear fixed plate are provided on the lower surface of the rear slide plate; a left limiting rotating shaft is provided between the left front fixed plate and the left rear fixed plate, and a left movable plate is provided on the left limiting rotating shaft; a right limiting rotating shaft is provided between the right front fixed plate and the right rear fixed plate, and a right movable plate is provided on the right limiting rotating shaft, the upper part of the left movable plate is slidably connected to the left opening and closing plate through a left rotating arm, and the upper part of the right movable plate is slidably connected to the right opening and closing plate through a right rotating arm; when the left opening and closing plate and the right opening and closing plate are closed, a second light-transmitting gap e is provided between the left opening and closing plate and the right opening and closing plate, and e<b.

[0017] The left sealing plate is used to seal the space between the left movable plate and the left baffle plate at the left part of the front chute plate and the rear chute plate to prevent the fry from passing through from here; the right sealing plate is used to seal the space between the right movable plate and the right baffle plate at the right part of the front chute plate and the rear chute plate to prevent the fry from passing through from here; the fry can only pass through between the left opening and closing plate and the right opening and closing plate.

[0018] Preferably, a left opening groove is provided on the left opening groove, the upper part of the left rotating arm is inserted into the left opening groove, a left oblong hole is provided on the upper part of the left rotating arm, a left sliding shaft is provided on the left opening groove, and the left oblong hole is slidably connected to the left sliding shaft; a right opening groove is provided on the right opening groove, the upper part of the right rotating arm is inserted into the right opening groove, a right oblong hole is provided on the upper part of the right rotating arm, a right sliding shaft is provided on the right opening groove, and the right oblong hole is slidably connected to the right sliding shaft.

[0019] Preferably, the left movable plate and the right movable plate are of symmetrical structure, the right part of the left movable plate is arched to the right in an arc shape, the left part of the right movable plate is arched to the left in an arc shape, the lower part of the left movable plate is rotatably connected to the left limit rotating shaft, the lower part of the right movable plate is rotatably connected to the right limit rotating shaft, and the lower ends of the left movable plate and the right movable plate are connected to the second reset pendant through a second suspension rope; when the left opening and closing plate and the right opening and closing plate are closed, the spacing between the left movable plate and the right movable plate is f, c>f>e.

[0020] Under the action of the left spring, the right spring, the second lifting rope and the second reset pendant, the left opening and closing plates and the right opening and closing plates are in a closed state. The small fish fry is small in size and cannot touch the left movable plate and the right movable plate at the same time. The small fish fry cannot push the left opening and closing plates to open, e<b, and the small fish fry cannot pass through the second light-transmitting gap.

[0021] The big fish fry will touch the left movable plate and the right movable plate at the same time, the left movable plate drives the left sealing plate and the left opening and closing plate to move to the left, and the right movable plate drives the right sealing plate and the right opening and closing plate to move to the right, so that the left opening and closing plate and the right opening and closing plate are opened, and the big fish fry smoothly passes between the left opening and closing plate and the right opening and closing plate and enters above the horizontal partition; then, the second hanging rope, the second reset pendant, the left spring and the right spring drive the left sealing plate, the right sealing plate, the left movable plate, the right movable plate, the left opening and closing plate and the right opening and closing plate to reset; when another big fish fry touches the left movable plate and the right movable plate at the same time, the above process is repeated.

[0022] As a preferred embodiment, the guide groove for the small fish fry to be introduced comprises a right front right-angled trapezoidal plate, a right rear right-angled trapezoidal plate, and a right strip cover plate arranged at the upper ends of the right front right-angled trapezoidal plate and the upper ends of the right rear right-angled trapezoidal plate;

[0023] The large fry confluence guide groove comprises a left front right-angle trapezoidal plate, a left rear right-angle trapezoidal plate, and a left strip cover plate arranged on the upper ends of the left front right-angle trapezoidal plate and the upper ends of the left rear right-angle trapezoidal plate.

[0024] A classification method of a fish seed non-destructive classification device comprises the following steps:

[0025] Step 1, pouring the fry of guppies into the lower box space through the fry inlet, and sealing the opening between the lower end of the fry inlet and the lower box space with a fishing net;

[0026] Step 2, increase the density of fry or use deoxidizer to control the oxygen content in the water, so that the light source provides illumination to the fry in the water and makes the fry float upward;

[0027] Step 3, under the action of the first hanging rope and the first reset pendant, the left movable flap and the right movable flap are in a natural flipping state, and the small fry enters the upper left box space through the first light-transmitting gap between the upper ends of the left movable flap and the right movable flap of each small fry escape mechanism on the left side of the horizontal partition; the small fry can also pass through the first light-transmitting gap between the upper ends of the left movable flap and the right movable flap of each small fry escape mechanism on the right side of the horizontal partition, enter the corresponding small fry convergence guide groove, and then enter the upper left box space;

[0028] Step 4, the large fish fry enters the upper right box space through the left opening and closing plates and the right opening and closing plates of each large fish fry escape mechanism on the right part of the horizontal partition. The large fish fry can also pass through the left opening and closing plates and the right opening and closing plates of each large fish fry escape mechanism on the left part of the horizontal partition, enter the large fish fry convergence guide groove, and then enter the upper right box space; the fish fry are classified by size.

[0029] The present invention separates large fry and small fry above the box body at the same time, effectively avoiding damage to the fry caused by prolonged hypoxia; light from the light source can pass through the first gap and the second gap into the lower box body space, so that the fry can escape along the set route through each small fry escape mechanism and each large fry escape mechanism due to lack of oxygen and phototropism.

[0030] Therefore, the present invention has the following beneficial effects: large fry and small fry can be separated above the box body at the same time, thus effectively avoiding damage to the fry and realizing lossless classification of guppy fry. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a cross-sectional view of the present invention;

[0032] Figure 2 is a top view of the present invention;

[0033] Figure 3 is a side view of the present invention;

[0034] Figure 4 It is a three-view diagram of the small fry escape mechanism of the present invention;

[0035] Figure 5 It is a three-view drawing of the large fry escape mechanism of the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] like Figure 1-Figure 5 The embodiment shown is a non-destructive classification device for fish fry, comprising a box 1 with an upper opening, a light source arranged above the box, a fry inlet 11 arranged on the right side of the box, a horizontal partition 12 arranged in the box on the left side of the fry inlet, a vertical partition 13 extending forward and backward arranged in the upper part of the box on the left side of the fry inlet, 2 rows of small fry escape mechanism groups and 2 rows of large fry escape mechanism groups arranged on the horizontal partition; the small fry escape mechanism groups and the large fry escape mechanism groups are arranged alternately;

[0038] The small fish fry escape mechanism group includes 14 small fish fry escape mechanisms 2 arranged at intervals, 7 small fish fry escape mechanisms are located at the left part of the horizontal partition, and the other 7 small fish fry escape mechanisms are located at the right part of the horizontal partition;

[0039] The large fish fry escape mechanism group comprises 10 large fish fry escape mechanisms 3 arranged at intervals, 5 large fish fry escape mechanisms are located at the left part of the horizontal partition, and the other 5 large fish fry escape mechanisms are located at the right part of the horizontal partition;

[0040] A guide groove 4 for guiding the small fish fry on the right into the small fish fry on the left is provided on the horizontal partition corresponding to the small fish fry escape mechanism group, and a guide groove 5 for guiding the large fish fry on the left into the large fish fry on the right is provided on the horizontal partition corresponding to the large fish fry escape mechanism group;

[0041] The guide groove for small fry to flow into and the guide groove for large fry to flow into are both in the shape of a lying right-angled trapezoid; the cross-sectional area of ​​the guide groove for small fry to flow into gradually increases from right to left, and the cross-sectional area of ​​the guide groove for large fry to flow into gradually increases from left to right; the lower end of the vertical partition is respectively connected to the upper left end of each small fry flow into the guide groove and the upper right end of each large fry flow into the guide groove, the box body on the left side of the vertical partition forms an upper left box body space 6, the box body on the right side of the vertical partition and on the left side of the fry entrance forms an upper right box body space 7, and the lower part of the horizontal partition is connected to the lower end of the fry entrance and forms a lower box body space 8.

[0042] The small fry escape mechanism includes a horizontal rectangular frame 21, two left fixed plates respectively arranged at the left front and left rear parts of the lower surface of the horizontal rectangular frame, and two right fixed plates 23 respectively arranged at the right front and right rear parts of the lower surface of the horizontal rectangular frame. The two left fixed plates are provided with a left longitudinal axis 24, and the two right fixed plates are provided with a right longitudinal axis 25. A left movable flap 26 is provided on the left longitudinal axis, and a right movable flap 27 is provided on the right longitudinal axis; the lower ends of the left movable flap and the right movable flap are both connected to the first reset pendant 264 through a first hanging rope 263; when the left movable flap and the right movable flap are in a naturally flipped state, the width of the first light-transmitting gap 28 between the upper ends of the left movable flap and the right movable flap is a, the size of the small fry is b, and the size of the large fry is c, and c>a>b.

[0043] The left movable flap and the right movable flap are symmetrical structures, the left movable flap includes a vertical plate 261 with an upper end extending into a horizontal rectangular frame and an inclined plate 262 arranged at the upper end of the vertical plate and gradually inclined upward from left to right, the lower right portion of the vertical plate is arched to the right, and the middle portion of the vertical plate is rotatably connected to the left fixed shaft; when the left movable flap and the right movable flap are in a natural flipping state, the distance between the lower right portion of the vertical plate of the left movable flap and the lower left portion of the vertical plate of the right movable flap is d, a<d<c.

[0044] The large fry escape mechanism includes a front chute plate 31, a rear chute plate 32, a left baffle plate 311 arranged between the left end of the front chute plate and the left end of the rear chute plate, a right baffle plate 321 arranged between the right end of the front chute plate and the right end of the rear chute plate, a left opening and closing plate 33 and a right opening and closing plate 34 arranged between the middle parts of the front chute plate and the rear chute plate, a left sealing plate 331 arranged between the left part of the lower surface of the front chute plate and the rear chute plate, and a right sealing plate arranged between the right part of the lower surface of the front chute plate and the rear chute plate; a left sealing plate groove and a right sealing plate groove are arranged in the horizontal partition plate, the left part of the left sealing plate extends into the left sealing plate groove, and the left spring arranged in the left sealing plate groove contacts the left edge of the left sealing plate; the right part of the right sealing plate extends into the right sealing plate groove, and the right spring arranged in the right sealing plate groove contacts the left edge of the left sealing plate In contact with the right edge of the right sealing plate; a left front fixed plate and a right front fixed plate 312 are provided on the lower surface of the front slide plate, and a left rear fixed plate and a right rear fixed plate 321 are provided on the lower surface of the rear slide plate; a left limiting rotating shaft 35 is provided between the left front fixed plate and the left rear fixed plate, and a left movable plate 351 is provided on the left limiting rotating shaft; a right limiting rotating shaft 36 is provided between the right front fixed plate and the right rear fixed plate, and a right movable plate 361 is provided on the right limiting rotating shaft, the upper part of the left movable plate is slidably connected with the left opening and closing plate through the left rotating arm 352, and the upper part of the right movable plate is slidably connected with the right opening and closing plate through the right rotating arm 362; when the left opening and closing plate and the right opening and closing plate are in a closed state, a second light-transmitting gap e is provided between the left opening and closing plate and the right opening and closing plate, e<b.

[0045] A left opening groove 331 is provided on the left opening plate, the upper part of the left rotating arm is inserted into the left opening groove, a left oblong hole 3521 is provided on the upper part of the left rotating arm, a left sliding shaft 332 is provided on the left opening groove, and the left oblong hole is slidably connected with the left sliding shaft; a right opening groove is provided on the right opening plate, the upper part of the right rotating arm is inserted into the right opening groove, a right oblong hole 3621 is provided on the upper part of the right rotating arm, a right sliding shaft 342 is provided on the right opening groove, and the right oblong hole is slidably connected with the right sliding shaft.

[0046] The left movable plate and the right movable plate are symmetrical structures. The right part of the left movable plate is arched to the right in an arc shape, and the left part of the right movable plate is arched to the left in an arc shape. The lower part of the left movable plate is rotatably connected to the left limit rotating shaft, and the lower part of the right movable plate is rotatably connected to the right limit rotating shaft. The lower ends of the left movable plate and the right movable plate are connected to the second reset pendant 372 through the second suspension rope 371; when the left opening and closing plate and the right opening and closing plate are closed, the spacing between the left movable plate and the right movable plate is f, c>f>e.

[0047] The guide groove for small fry to merge into comprises a right front right-angled trapezoidal plate 20, a right rear right-angled trapezoidal plate, and a right strip cover plate arranged at the upper ends of the right front right-angled trapezoidal plate and the right rear right-angled trapezoidal plate; the guide groove for large fry to merge into comprises a left front right-angled trapezoidal plate 30, a left rear right-angled trapezoidal plate, and a left strip cover plate arranged at the upper ends of the left front right-angled trapezoidal plate and the left rear right-angled trapezoidal plate.

[0048] A classification method of a fish seed non-destructive classification device comprises the following steps:

[0049] Step 1, pouring the fry of guppies into the lower box space through the fry inlet, and sealing the opening between the lower end of the fry inlet and the lower box space with a fishing net;

[0050] Step 2, using a deoxidizer to control the oxygen content in the water so that the light source provides illumination to the fry in the water and the fry float upward;

[0051] Step 3: Under the action of the first suspension rope and the first reset pendant, the left movable flap and the right movable flap are in the following positions: Figure 4 In the natural flipping state shown, the small fish fry enters the upper left box space through the first light-transmitting gap between the upper ends of the left movable flap and the right movable flap of each small fish fry escape mechanism on the left side of the horizontal partition;

[0052] At the same time, the small fish fry can also pass through the first light-transmitting gap between the upper ends of the left movable flap and the right movable flap of each small fish fry escape mechanism on the right side of the horizontal partition, enter the corresponding small fish fry convergence guide groove, and then enter the upper left box space;

[0053] The large fish fry is large in size. When the large fish fry passes through the lower right part of the vertical plate of the left movable flap and the lower left part of the vertical plate of the right movable flap, the large fish fry touches the lower right part of the vertical plate of the left movable flap and the lower left part of the vertical plate of the right movable flap at the same time, so that the openings at the upper end of the left movable flap and the upper end of the right movable flap are closed. The large fish fry cannot pass through the gap between the upper end of the left movable flap and the upper end of the right movable flap, and the large fish fry can only exit downward between the lower right part of the vertical plate of the left movable flap and the lower left part of the vertical plate of the right movable flap.

[0054] Step 4, the large fish fry enters the upper right box space through the left opening and closing plates and the right opening and closing plates of each large fish fry escape mechanism on the right part of the horizontal partition. The large fish fry can also pass through the left opening and closing plates and the right opening and closing plates of each large fish fry escape mechanism on the left part of the horizontal partition, enter the large fish fry convergence guide groove, and then enter the upper right box space; the fish fry are classified by size.

[0055] Under the action of the left spring, the right spring, the second suspension rope and the second reset pendant, the left opening and closing plate and the right opening and closing plate are in the following Figure 5In the closed state shown, the small fish fry is small in size and cannot touch the left movable plate and the right movable plate at the same time. The small fish fry cannot push the left opening and closing plate and the right opening and closing plate to open, e<b, and the small fish fry cannot pass through the second light-transmitting gap and can only leave the large fish fry escape mechanism.

[0056] The big fish fry will touch the left movable plate and the right movable plate at the same time, the left movable plate drives the left sealing plate and the left opening and closing plate to move to the left, and the right movable plate drives the right sealing plate and the right opening and closing plate to move to the right, so that the left opening and closing plate and the right opening and closing plate are opened, and the big fish fry smoothly passes between the left opening and closing plate and the right opening and closing plate and enters above the horizontal partition; then, the second hanging rope, the second reset pendant, the left spring and the right spring drive the left sealing plate, the right sealing plate, the left movable plate, the right movable plate, the left opening and closing plate and the right opening and closing plate to reset; when another big fish fry touches the left movable plate and the right movable plate at the same time, the above process is repeated.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A non-destructive classification device for fish fry, characterized in that: The invention comprises a box body (1) with an opening at the upper end, a light source arranged above the box body, a fry entrance (11) arranged at the right part of the box body, a horizontal partition (12) arranged in the box body on the left side of the fry entrance, a vertical partition (13) extending forward and backward arranged in the upper part of the box body on the left side of the fry entrance, N rows of small fry escape mechanism groups and N rows of large fry escape mechanism groups arranged on the horizontal partition, N ≥ 2; the small fry escape mechanism groups and the large fry escape mechanism groups are arranged alternately; The small fry escape mechanism group comprises 2M small fry escape mechanisms (2) arranged at intervals, M of the small fry escape mechanisms are located at the left part of the horizontal partition, and another M of the small fry escape mechanisms are located at the right part of the horizontal partition, M≥5; The large fry escape mechanism group comprises 2L large fry escape mechanisms (3) arranged at intervals, L large fry escape mechanisms are located at the left part of the horizontal partition, and another L large fry escape mechanisms are located at the right part of the horizontal partition, L ≥ 3; A guide groove (4) for guiding the right small fry into the left small fry is provided on the horizontal partition corresponding to the small fry escape mechanism group, and a guide groove (5) for guiding the left large fry into the right large fry is provided on the horizontal partition corresponding to the large fry escape mechanism group; The guide groove for small fry inlet and the guide groove for large fry inlet are both in the shape of a lying right-angled trapezoid; the cross-sectional area of ​​the guide groove for small fry inlet increases gradually from right to left, and the cross-sectional area of ​​the guide groove for large fry inlet increases gradually from left to right; the lower end of the vertical partition is respectively connected to the upper left end of each small fry inlet guide groove and the upper right end of each large fry inlet guide groove, the box body on the left side of the vertical partition forms an upper left box body space (6), the box body on the right side of the vertical partition and on the left side of the fry entrance forms an upper right box body space (7), and the lower side of the horizontal partition is connected to the lower end of the fry entrance and forms a lower box body space (8).

2. The fish seed non-destructive classification device according to claim 1 is characterized in that: The small fry escape mechanism comprises a horizontal rectangular frame (21), two left fixed plates respectively arranged at the left front part and the left rear part of the lower surface of the horizontal rectangular frame, and two right fixed plates (23) respectively arranged at the right front part and the right rear part of the lower surface of the horizontal rectangular frame. The two left fixed plates are provided with a left longitudinal axis (24), the two right fixed plates are provided with a right longitudinal axis (25), a left movable flap (26) is provided on the left longitudinal axis, and a right movable flap (27) is provided on the right longitudinal axis; the lower ends of the left movable flap and the right movable flap are both connected to a first reset pendant (264) through a first hanging rope (263); when the left movable flap and the right movable flap are in a naturally flipped state, the width of a first light-transmitting gap (28) between the upper ends of the left movable flap and the right movable flap is a, the size of the small fry is b, and the size of the large fry is c, and c>a>b.

3. The fish seed non-destructive classification device according to claim 2 is characterized in that: The left movable flap and the right movable flap are symmetrical structures. The left movable flap comprises a vertical plate (261) whose upper end extends into a horizontal rectangular frame and an inclined plate (262) arranged at the upper end of the vertical plate and gradually inclined upward from left to right. The lower right part of the vertical plate is arched to the right in an arc shape, and the middle part of the vertical plate is rotatably connected to the left fixed shaft. When the left movable flap and the right movable flap are in a naturally flipped state, the distance between the lower right part of the vertical plate of the left movable flap and the lower left part of the vertical plate of the right movable flap is d, and a<d<c.

4. The fish seed non-destructive classification device according to claim 3 is characterized in that: The large fry escape mechanism comprises a front chute plate (31), a rear chute plate (32), a left baffle plate (311) arranged between the left end of the front chute plate and the left end of the rear chute plate, a right baffle plate (321) arranged between the right end of the front chute plate and the right end of the rear chute plate, a left opening and closing plate (33) and a right opening and closing plate (34) arranged between the middle parts of the front chute plate and the rear chute plate, a left sealing plate (331) arranged between the left parts of the lower surfaces of the front chute plate and the rear chute plate, and a right sealing plate arranged between the right parts of the lower surfaces of the front chute plate and the rear chute plate; a left sealing plate groove and a right sealing plate groove are arranged in the horizontal partition plate, the left part of the left sealing plate extends into the left sealing plate groove, and the left spring arranged in the left sealing plate groove contacts the left edge of the left sealing plate; the right part of the right sealing plate extends into the right sealing plate groove, and the right spring arranged in the right sealing plate groove contacts the left edge of the left sealing plate The right edge of the right sealing plate is in contact; a left front fixing plate and a right front fixing plate (312) are provided on the lower surface of the front slide plate, and a left rear fixing plate and a right rear fixing plate (321) are provided on the lower surface of the rear slide plate; a left limiting rotating shaft (35) is provided between the left front fixing plate and the left rear fixing plate, and a left movable plate (351) is provided on the left limiting rotating shaft; a right limiting rotating shaft (36) is provided between the right front fixing plate and the right rear fixing plate, and a right movable plate (361) is provided on the right limiting rotating shaft; the upper portion of the left movable plate is slidably connected to the left opening and closing plate through a left rotating arm (352), and the upper portion of the right movable plate is slidably connected to the right opening and closing plate through a right rotating arm (362); when the left opening and closing plate and the right opening and closing plate are in a closed state, a second light-transmitting gap e is provided between the left opening and closing plate and the right opening and closing plate, and e<b.

5. The fish seed non-destructive classification device according to claim 4 is characterized in that: The left opening and closing plate is provided with a left opening groove (331), the upper part of the left rotating arm is inserted into the left opening groove, the upper part of the left rotating arm is provided with a left oblong hole (3521), the left opening groove is provided with a left sliding shaft (332), and the left oblong hole is slidably connected to the left sliding shaft; the right opening and closing plate is provided with a right opening groove, the upper part of the right rotating arm is inserted into the right opening groove, the upper part of the right rotating arm is provided with a right oblong hole (3621), the right opening groove is provided with a right sliding shaft (342), and the right oblong hole is slidably connected to the right sliding shaft.

6. The fish seed non-destructive classification device according to claim 5 is characterized in that: The left movable plate and the right movable plate are symmetrical structures. The right part of the left movable plate is arched to the right in an arc shape, and the left part of the right movable plate is arched to the left in an arc shape. The lower part of the left movable plate is rotatably connected to the left limit rotating shaft, and the lower part of the right movable plate is rotatably connected to the right limit rotating shaft. The lower ends of the left movable plate and the right movable plate are connected to the second reset pendant (372) through a second suspension rope (371); when the left opening and closing plate and the right opening and closing plate are closed, the distance between the left movable plate and the right movable plate is f, c>f>e.

7. The fish seed non-destructive classification device according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The guide groove for the small fish fry to be introduced comprises a right front right angle trapezoidal plate (20), a right rear right angle trapezoidal plate, and a right strip cover plate arranged at the upper ends of the right front right angle trapezoidal plate and the upper ends of the right rear right angle trapezoidal plate; The large fry confluence guide groove comprises a left front right-angled trapezoidal plate (30), a left rear right-angled trapezoidal plate, and a left strip-shaped cover plate arranged on the upper ends of the left front right-angled trapezoidal plate and the upper ends of the left rear right-angled trapezoidal plate.

8. A classification method based on the fish seed non-destructive classification device according to claim 6, characterized in that: The steps include: Step 1, pouring the fry of guppies into the lower box space through the fry inlet, and sealing the opening between the lower end of the fry inlet and the lower box space with a fishing net; Step 2, increase the density of fry or use deoxidizer to control the oxygen content in the water, so that the light source provides illumination to the fry in the water and makes the fry float upward; Step 3, under the action of the first hanging rope and the first reset pendant, the left movable flap and the right movable flap are in a natural flipping state, and the small fry enters the upper left box space through the first light-transmitting gap between the upper ends of the left movable flap and the right movable flap of each small fry escape mechanism on the left side of the horizontal partition; the small fry can also pass through the first light-transmitting gap between the upper ends of the left movable flap and the right movable flap of each small fry escape mechanism on the right side of the horizontal partition, enter the corresponding small fry convergence guide groove, and then enter the upper left box space; Step 4, the large fish fry enters the upper right box space through the left opening and closing plates and the right opening and closing plates of each large fish fry escape mechanism on the right part of the horizontal partition. The large fish fry can also pass through the left opening and closing plates and the right opening and closing plates of each large fish fry escape mechanism on the left part of the horizontal partition, enter the large fish fry convergence guide groove, and then enter the upper right box space; the fish fry are classified by size.

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