Based on the fish fry density control system used in the mandarin fish fry breeding pond

Abstract

The invention provides a fry density control system based on a mandarin fish fry breeding pond, and relates to the technical field of density control for mandarin fish fry breeding. The invention comprises a base, a cover plate is fixedly connected to the top of the base, and the cover plate and the base together form a bearing structure. A support plate is installed at the top of a transverse member in the base through a spring, and the support plate is used to bear the breeding pond. A weighing device is also installed on the top surface of the transverse member in the base. A through groove is provided in a linear array inside a dial plate in a limiting wheel, and the limiting wheel is located directly below a feeding pipe, so that the problem of lack of accurate and effective density detection means when the fry need to be controlled is solved, which will affect the subsequent normal control of the density. An initial inspection operation can be performed after subtracting the weight of the water body and the fry from the detected data. The provision of quick disassembly of a bearing frame and a mounting frame not only facilitates subsequent inspection and maintenance operations, but also is more conducive to the detection and judgment of the density of the fry.

Description

Technical Field

[0001] The invention relates to the technical field of density control for mandarin fish fry breeding, and in particular to a fry density control system based on a mandarin fish fry breeding pond. Background Art

[0002] Mandarin fish is a fish of the Serranidae family and the genus Siniperca. It has a tall body, flat sides, a prominent bulge behind the eye, a medium-sized head, a pointed snout, which is longer than the eye diameter, a large middle eye, slightly larger than the interocular distance, a large, terminal mouth, and an oblique fissure. When breeding mandarin fish fry, it is often necessary to precisely control the release of feed according to the size and density of the fry for cultivation control. However, when the density of mandarin fish is too high, it will lead to a lack of nutrients, and when the density of mandarin fish is too low, it will lead to a waste of nutrients. Therefore, a corresponding control system is needed to control the density of the fry.

[0003] However, as far as the current control system is concerned, when controlling the drainage of fry, the fry are mostly directly caught and then transferred, making it difficult to ensure the precise control of the density of the fry during the transfer process, which has limitations. In addition, when the fry need to be controlled, there is a lack of accurate and effective density detection methods, which will affect the subsequent normal control of the density. Summary of the invention

[0004] The present invention provides a fry density control system for a mandarin fish fry breeding pond, which specifically includes: a base, a cover plate fixedly connected to the top of the base, the cover plate and the base together form a bearing structure, a support plate is installed on the top of a transverse member in the base through a spring, the support plate is used to support the breeding pond, a weighing device is also installed on the top surface of the transverse member in the base, a dial plate in a limiting wheel has through grooves arranged in a linear array inside, and the limiting wheel is located directly below a feeding pipe, a gear A is coaxially installed on the left side of the limiting wheel, and a counter is coaxially installed on the left side of the limiting wheel, the counter is electrically connected to an electromagnetic baffle, when the counter is in a single counting completion state, the electromagnetic baffle is in an open state, an inner ratchet is fixedly connected to the left side of a longitudinal member in a control tube, a gear B is installed on the left side of the inner ratchet, the gear B is meshed with the gear A, and the inner ratchet, the gear B and the gear A together form a limiting structure for the limiting wheel.

[0005] Optionally, the feeding pipe is used to feed feed into the control pipe, and through holes are opened in a rectangular array on the bottom end surface of the cross member in the control pipe, and the through holes opened in the control pipe are located in the breeding pond, and the through holes opened in the cross member in the control pipe are used for drainage, and an extraction pump is installed at the front end of the control pipe, and the extraction pump is used to extract fry.

[0006] Optionally, the interior of the supporting frame is fixedly connected with a mounting frame, the mounting frame is used to carry breeding equipment, a breeding pond is placed on the top of the support plate, the breeding pond is used to breed mandarin fish fry, and the interior of the breeding pond is plugged with the mounting frame and the supporting frame, a through groove is opened at the front end of the breeding pond, and the through groove opened at the front end of the breeding pond is used for the sliding of the movable seat.

[0007] Optionally, the limit block B is a circular structure, and the limit block B matches the arc groove opened in the limit block A, and the electric push rod, the limit block A and the limit block B together constitute a limiting structure for the reflux pipe installed in the control pipe, and the control pipe is plugged into the interior of the movable seat, and the control pipe is used to control the density of the mandarin fish fry, and a feeding pipe is plugged into the top of the control pipe.

[0008] Optionally, the weighing device is located directly below the support plate, a hydraulic push rod is installed on the bottom end surface of the transverse member in the cover plate, a load frame is installed on the bottom end surface of the hydraulic push rod, the load frame is used to absorb debris such as fish feces, and the load frame and the hydraulic push rod together constitute an adjustment structure.

[0009] Optionally, a pump tube is installed at the front end of the extraction pump, and the pump tube and the extraction pump together constitute a transfer structure for the fry, and two electromagnetic baffles are installed opposite to each other on the bottom opening side of the control tube, and the electromagnetic baffles are a delayed closing structure, and an extraction tube and a return tube are installed opposite to each other inside the transverse member in the control tube, and both the extraction tube and the return tube are conical structures, and the extraction tube is used to limit the size of the fry, and a limiting wheel is installed inside the transverse member in the control tube, and the limiting wheel is composed of a rotating shaft and a dial plate.

[0010] Optionally, a side panel is fixedly connected to the rear side of the moving seat, and two side panels are provided, and the two side panels are respectively fixedly connected to the left and right sides of the rear end surface of the moving seat, and electric push rods are installed on the inner sides of the two side panels, wherein a limit block A is installed at the output end of the left electric push rod, and the limit block A is an arc-shaped structure, and a limit block B is installed at the output end of the right electric push rod.

[0011] Optionally, a motor is installed on the left side of the breeding pond, and a screw is installed on the right side of the motor. The motor is used to drive the screw to rotate. A screw hole matching the screw is opened inside the movable seat. The motor and the screw together constitute a driving structure for the movable seat, and sealing covers are fixedly connected to the left and right sides of the movable seat, and the movable seat is connected to the base through the sealing cover.

[0012] Beneficial Effects

[0013] Compared with the traditional control system, after the fry have been pushed open by the electromagnetic baffle installed at the bottom of the control tube, the extraction pump installed at the front end of the control tube can be synchronously started to extract the fry entering the control tube, and after a single fry enters the control tube, the electromagnetic baffle can be synchronously started to generate magnetism for sealing, and then the fry continues to move upward to turn the limit wheel installed in the control tube and automatically count the number of fry discharged from the breeding pond through the counter, thereby achieving the purpose of accurately controlling the fry density.

[0014] In addition, in the present invention, when it is necessary to control the density of fry, an extraction tube of suitable specifications can be installed in the internal position of the transverse member in the control tube, and the electric push rod installed on the inner side of the side plate can be started to push the limit block A and the limit block B inward at the same time to limit the opening diameter of the return tube installed on the rear side of the control tube, so that the fry entering the control tube can be accurately screened according to their sizes when controlling the density, thereby achieving a more practical purpose, and when the limit wheel rotates, the meshing of gear A and gear B and the unidirectional rotation limiting of the inner ratchet can ensure that the limit wheel can only realize unidirectional rotation for fish supply when rotating.

[0015] In addition, in the present invention, when it is necessary to detect the density of mandarin fish fry in the breeding pond, the hydraulic push rod installed at the bottom end of the cover plate can be started to pull the support frame together with the mounting frame and the breeding equipment upward until they are separated from the breeding pond. At this time, the weight of the breeding pond can be detected in real time by starting the weighing device installed in the base. After the weight detection of the breeding pond is completed by the weighing device, an initial inspection operation can be performed by subtracting the weight of the water body and the fry from the detected data. The quick disassembly of the support frame and the mounting frame is not only convenient for subsequent inspection and maintenance operations, but also more conducive to the detection and judgment of the density of the fry. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0017] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0018] In the attached picture:

[0019] Figure 1 A schematic diagram showing a front and side view of a control system according to an embodiment of the present invention in which part of the structure is disassembled and cut away;

[0020] Figure 2A schematic diagram showing a top and side view of a control system according to an embodiment of the present invention in which a portion of the structure is disassembled and cut away;

[0021] Figure 3 A schematic diagram showing an assembly structure of a control system according to an embodiment of the present invention;

[0022] Figure 4 A schematic diagram showing a base to weighing device display structure of a control system according to an embodiment of the present invention is shown;

[0023] Figure 5 A schematic diagram showing a hydraulic push rod to mounting bracket structure of a control system according to an embodiment of the present invention is shown;

[0024] Figure 6 A schematic diagram showing a structure from a moving seat to an inner ratchet wheel of a control system according to an embodiment of the present invention is shown;

[0025] Figure 7 The control system according to the embodiment of the present invention is shown. Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 8 The control system according to the embodiment of the present invention is shown. Figure 2 Schematic diagram of the enlarged structure at B;

[0027] Fig. 9 A schematic diagram showing a system structure of a control system according to an embodiment of the present invention;

[0028] Reference numerals list

[0029] 1. Base; 2. Cover plate; 3. Support plate; 4. Weighing device; 5. Hydraulic push rod; 6. Carrying frame; 7. Mounting frame; 8. Breeding pond; 9. Motor; 10. Screw; 11. Moving seat; 12. Sealing cover; 13. Side plate; 14. Electric push rod; 15. Limit block A; 16. Limit block B; 17. Control pipe; 18. Feeding pipe; 19. Extraction pump; 20. Pump pipe; 21. Electromagnetic baffle; 22. Extraction pipe; 23. Reflux pipe; 24. Limit wheel; 25. Gear A; 26. Counter; 27. Gear B; 28. Inner ratchet. DETAILED DESCRIPTION

[0030] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0031] Example: Please refer to Figures 1 to 9 :

[0032] The present invention proposes a fry density control system for a mandarin fish fry breeding pond, comprising: a base 1, a cover plate 2 is fixedly connected to the top of the base 1, the cover plate 2 and the base 1 together form a bearing structure, a support plate 3 is installed on the top of a transverse member in the base 1 through a spring, the support plate 3 is used to support the breeding pond 8, a weighing device 4 is also installed on the top surface of the transverse member in the base 1, a through groove is opened in a linear array inside the dial plate in the limiting wheel 24, and the limiting wheel 24 is located directly below the feeding pipe 18, and a gear A25 is coaxially installed on the left side of the limiting wheel 24 , and a counter 26 is coaxially installed on the left side of the limiting wheel 24, and the counter 26 is electrically connected to the electromagnetic baffle 21. When the counter 26 is in a single counting completion state, the electromagnetic baffle 21 is in an open state, and an inner ratchet 28 is fixedly connected to the left side of the longitudinal member in the control tube 17, and a gear B27 is installed on the left side of the inner ratchet 28. The gear B27 is meshed with the gear A25, and the inner ratchet 28, the gear B27 and the gear A25 together constitute a limiting structure for the limiting wheel 24, and a pump pipe 20 is installed at the front end of the extraction pump 19, and the pump pipe 20 and the extraction pump 19 together form a transfer structure for fry. Two electromagnetic baffles 21 are installed opposite to each other on the bottom opening side of the control tube 17. The electromagnetic baffles 21 are a delayed closing structure. An extraction pipe 22 and a return pipe 23 are installed opposite to each other inside the transverse member of the control tube 17. Both the extraction pipe 22 and the return pipe 23 are conical structures, and the extraction pipe 22 is used to limit the size of the fry. A limiting wheel 24 is installed inside the transverse member of the control tube 17. The limiting wheel 24 is composed of a rotating shaft and a dial plate. When the fry passes through the control tube 17, the limiting wheel 24 is installed inside the control tube 17. After the electromagnetic baffle 21 at the bottom is opened, the extraction pump 19 installed at the front end of the control tube 17 can be synchronously started to extract the fry entering the control tube 17, and when a single fry enters the control tube 17, the electromagnetic baffle 21 can be synchronously started to generate magnetism for sealing, and then the fry continues to move upward to turn the limiting wheel 24 installed in the control tube 17 and use the counter 26 to automatically count the number of fry discharged from the breeding pond 8, thereby achieving the purpose of accurately controlling the fry density.

[0033] In addition, according to an embodiment of the present invention, Figure 1-Figure 3As shown, the weighing device 4 is located directly below the support plate 3, a hydraulic push rod 5 is installed on the bottom end surface of the transverse member in the cover plate 2, and a bearing frame 6 is installed on the bottom end surface of the hydraulic push rod 5. The bearing frame 6 is used to absorb debris such as fish feces. The bearing frame 6 and the hydraulic push rod 5 together form an adjustment structure. The inside of the bearing frame 6 is fixedly connected with a mounting frame 7, and the mounting frame 7 is used to carry breeding equipment. A breeding pool 8 is placed on the top of the support plate 3. The breeding pool 8 is used to breed mandarin fish fry, and the inside of the breeding pool 8 is plugged with the mounting frame 7 and the bearing frame 6. A through slot is provided at the front end of the culture pool 8, and the through slot provided at the front end of the culture pool 8 is used for the sliding of the movable seat 11. When the density of the fry needs to be controlled, the extraction tube 22 of suitable specifications can be installed in the internal position of the transverse member in the control tube 17, and the electric push rod 14 installed on the inner side of the side plate 13 is started to push the limit block A15 and the limit block B16 inward at the same time to limit the opening diameter of the return pipe 23 installed on the rear side of the control tube 17, so that when entering the control tube 17, the return pipe 23 can be moved to the inner side of the control tube 17. The fry in the part can be accurately screened according to their sizes when controlling the density, thereby achieving a more practical purpose. When the limiting wheel 24 rotates, the gear A25 and the gear B27 can be meshed, and the unidirectional rotation of the inner ratchet 28 can be limited to ensure that the limiting wheel 24 can only realize the unidirectional rotation operation when rotating. When it is necessary to detect the density of the mandarin fish fry in the breeding pond 8, the hydraulic push rod 5 installed at the bottom of the cover plate 2 can be started to pull the supporting frame 6 together with the mounting frame 7 and the breeding equipment upward until they are separated from the breeding pond 8. At this time, the weighing device 4 installed in the base 1 is started to perform real-time detection of the weight of the breeding pond 8. After the weight detection of the breeding pond 8 is completed by the weighing device 4, the initial inspection operation can be performed by subtracting the weight of the water body and the fry from the detected data. The quick disassembly of the supporting frame 6 and the mounting frame 7 is not only convenient for subsequent inspection and maintenance operations, but also more conducive to the detection and judgment of the density of the fry.

[0034] In addition, according to an embodiment of the present invention, Figure 1-Figure 6As shown, a motor 9 is installed on the left side of the breeding pond 8, and a screw 10 is installed on the right side of the motor 9. The motor 9 is used to drive the screw 10 to rotate. A screw hole matching the screw 10 is opened inside the moving seat 11. The motor 9 and the screw 10 together constitute a driving structure for the moving seat 11, and the left and right sides of the moving seat 11 are fixedly connected with a sealing cover 12, and the moving seat 11 is connected to the base 1 through the sealing cover 12. The rear side of the moving seat 11 is fixedly connected with a side plate 13. There are two side plates 13, and the two side plates 13 are respectively fixedly connected to the left and right sides of the rear end surface of the moving seat 11, and electric push rods 14 are installed on the inner sides of the two side plates 13, wherein a limit block A15 is installed at the output end of the left electric push rod 14, and the limit block A15 is an arc structure, and a limit block B16 is installed at the output end of the right electric push rod 14.

[0035] In addition, according to an embodiment of the present invention, Figure 1-Figure 9 As shown, the limit block B16 is a circular structure, and the limit block B16 matches the arc groove opened in the limit block A15, and the electric push rod 14, the limit block A15 and the limit block B16 together constitute a limit structure for the return pipe 23 installed in the control pipe 17, the interior of the movable seat 11 is plugged with the control pipe 17, the control pipe 17 is used to control the density of the mandarin fish fry, the top of the control pipe 17 is plugged with a feeding pipe 18, the feeding pipe 18 is used to feed into the control pipe 17, the bottom end surface of the cross member in the control pipe 17 is provided with through holes in a rectangular array, and the through holes opened in the control pipe 17 are located in the breeding pond 8, and the through holes opened in the cross member in the control pipe 17 are used for drainage, and the front end of the control pipe 17 is installed with an extraction pump 19, and the extraction pump 19 is used to extract the fry.

[0036] Specific usage and function of this embodiment: In the present invention, when the fry of mandarin fish is needed for breeding, the breeding pool 8 can be placed on the support plate 3 installed on the top of the base 1 through the spring, and the corresponding breeding liquid and fry are put into the breeding pool 8 placed on the support plate 3 for breeding;

[0037] When it is necessary to assemble various breeding equipment into the breeding pond 8, the corresponding mandarin fish breeding equipment can be placed on the upper end of the mounting frame 7 fixedly connected to the carrier frame 6 for assembly, and then the hydraulic push rod 5 installed at the bottom end of the cover plate 2 is activated to put the carrier frame 6 together with the breeding equipment assembled on the mounting frame 7 into the breeding pond 8 to carry out normal breeding work on mandarin fish;

[0038] When it is necessary to detect the density of the mandarin fish fry in the breeding pond 8, the hydraulic push rod 5 installed at the bottom of the cover plate 2 can be started to pull the supporting frame 6 together with the mounting frame 7 and the breeding equipment upward until they are separated from the breeding pond 8. At this time, the weighing device 4 installed in the base 1 is started to perform a real-time detection operation on the weight of the breeding pond 8. After the weight detection of the breeding pond 8 is completed by the weighing device 4, the initial inspection operation can be performed by subtracting the weight of the water body and the fry from the detected data. The quick disassembly of the supporting frame 6 and the mounting frame 7 is not only convenient for subsequent maintenance and other operations, but also more conducive to the detection and judgment of the density of the fry.

[0039] After the weight detection of the water body and the fry is completed, the density of the fry in the current breeding pond 8 can be quickly detected and judged by subtracting the weight of the water body and dividing the total weight of the fry by the general weight of a single fry, thereby achieving the purpose of more conveniently controlling the density of the fry in the future;

[0040] When the density of fry is too high and needs to be controlled, the feed for raising fry can be put into the inner position of the control tube 17 through the feeding pipe 18 installed at the top of the control tube 17, and then the motor 9 installed on the left side of the breeding pool 8 is started to drive the screw 10 to rotate, and the screw 10 is connected with the moving seat 11 through the transmission connection to synchronously drive the control tube 17 to move to a suitable position for placement through the movement of the moving seat 11;

[0041] When the fry have been pushed away by the electromagnetic baffle 21 installed at the bottom of the control tube 17, the extraction pump 19 installed at the front end of the control tube 17 can be synchronously started to extract the fry entering the control tube 17, and when a single fry enters the control tube 17, the electromagnetic baffle 21 can be synchronously started to generate magnetism for sealing, and then the fry continues to move upward to turn the limiting wheel 24 installed in the control tube 17 and automatically count the number of fry discharged from the breeding pond 8 through the counter 26, thereby achieving the purpose of accurately controlling the density of fry;

[0042] And when it is necessary to control the density of fry, the extraction tube 22 of suitable specifications can be installed in the internal position of the transverse member in the control tube 17, and the electric push rod 14 installed on the inner side of the side plate 13 can be started to push the limit block A15 and the limit block B16 inward at the same time to limit the opening diameter of the return tube 23 installed on the rear side of the control tube 17, so that the fry entering the control tube 17 can be accurately screened according to their sizes when controlling the density, thereby achieving a more practical purpose. When the limit wheel 24 rotates, the gear A25 and the gear B27 are engaged, and the one-way rotation of the inner ratchet 28 is limited to ensure that the limit wheel 24 can only realize one-way rotation for fish supply when rotating.

[0043] Finally, it should be noted that when describing the position of each component and the matching relationship between them, the present invention usually takes one / a pair of components as an example. However, those skilled in the art should understand that such position, matching relationship, etc. are also applicable to other components / other pairs of components.

[0044] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A fry density control system for a mandarin fish fry breeding pond, characterized in that: include: A base (1) and a movable base (11), wherein the top of the base (1) is fixedly connected to a cover plate (2), and the cover plate (2) and the base (1) together form a bearing structure, and a support plate (3) is installed on the top of the transverse member in the base (1) through a spring, and the support plate (3) is used to support the breeding pond (8), and a weighing device (4) is also installed on the top surface of the transverse member in the base (1), and a through groove is provided in a linear array inside the dial plate in the limiting wheel (24), and the limiting wheel (24) is located directly below the feeding pipe (18), and a gear A (25) is coaxially installed on the left side of the limiting wheel (24). ), and a counter (26) is coaxially mounted on the left side of the limiting wheel (24), the counter (26) is electrically connected to the electromagnetic baffle (21), when the counter (26) is in a single counting completion state, the electromagnetic baffle (21) is in an open state, an inner ratchet (28) is fixedly connected to the left side of the longitudinal member in the control tube (17), a gear B (27) is mounted on the left side of the inner ratchet (28), the gear B (27) is meshed with the gear A (25), and the inner ratchet (28) and the gear B (27) and the gear A (25) together form a limiting structure for the limiting wheel (24); A control tube (17) is plugged into the interior of the movable seat (11), and the control tube (17) is used to control the density of the mandarin fish fry. A feeding tube (18) is plugged into the top of the control tube (17); The feeding pipe (18) is used to feed feed into the control pipe (17); a through hole is provided in a rectangular array on the bottom end surface of the transverse member in the control pipe (17); the through holes provided in the control pipe (17) are located in the breeding pond (8); and the through holes provided in the transverse member in the control pipe (17) are used for drainage; an extraction pump (19) is installed at the front end of the control pipe (17); the extraction pump (19) is used for extracting fry; A pump pipe (20) is installed at the front end of the extraction pump (19), and the pump pipe (20) and the extraction pump (19) together form a transfer structure for fry. Two electromagnetic baffles (21) are installed opposite to each other on the bottom opening side of the control tube (17), and the electromagnetic baffles (21) are of a delayed closing structure. An extraction pipe (22) and a return pipe (23) are installed opposite to each other inside the transverse member in the control tube (17), and both the extraction pipe (22) and the return pipe (23) are of a conical structure. The extraction pipe (22) is used to limit the size of the fry. A limiting wheel (24) is installed inside the transverse member in the control tube (17), and the limiting wheel (24) is composed of a rotating shaft and a dial plate. The weighing device (4) is located directly below the support plate (3); a hydraulic push rod (5) is installed on the bottom end surface of the transverse member in the cover plate (2); a bearing frame (6) is installed on the bottom end surface of the hydraulic push rod (5); the bearing frame (6) is used to absorb fish feces and debris; the bearing frame (6) and the hydraulic push rod (5) together form an adjustment structure; The interior of the support frame (6) is fixedly connected to a mounting frame (7), the mounting frame (7) being used to carry aquaculture equipment; a culturing pool (8) is placed on the top of the support plate (3), the culturing pool (8) being used to cultivate mandarin fish fry; the interior of the culturing pool (8) is plugged with the mounting frame (7) and the supporting frame (6); a through groove is provided at the front end of the culturing pool (8), and the through groove provided at the front end of the culturing pool (8) is used for the sliding of the movable seat (11).

2. The fry density control system for a mandarin fish fry breeding pond according to claim 1, characterized in that: A motor (9) is installed on the left side of the breeding pond (8), and a screw rod (10) is installed on the right side of the motor (9). The motor (9) is used to drive the screw rod (10) to rotate. A screw hole matching the screw rod (10) is provided inside the movable seat (11). The motor (9) and the screw rod (10) together form a driving structure for the movable seat (11). The left and right sides of the movable seat (11) are fixedly connected with sealing covers (12), and the movable seat (11) is connected to the base (1) via the sealing cover (12).

3. The fry density control system for a mandarin fish fry breeding pond according to claim 2, characterized in that: The rear side of the movable seat (11) is fixedly connected to a side plate (13), the side plates (13) are provided at two locations, and the two side plates (13) are respectively fixedly connected to the left and right sides of the rear end surface of the movable seat (11), and electric push rods (14) are installed on the inner sides of the two side plates (13), wherein a limit block A (15) is installed at the output end of the left electric push rod (14), and the limit block A (15) is an arc-shaped structure, and a limit block B (16) is installed at the output end of the right electric push rod (14).

4. The fry density control system for a mandarin fish fry breeding pond according to claim 3, characterized in that: The limit block B (16) is a circular structure, and the limit block B (16) matches the arc groove provided in the limit block A (15), and the electric push rod (14), the limit block A (15) and the limit block B (16) together form a limit structure for the return pipe (23) installed in the control pipe (17).

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