Circulating breeding experiment device

Abstract

The utility model discloses a circulating breeding experiment device which comprises an experiment breeding bin, a filter box is arranged outside the experiment breeding bin, a backflow pipe is installed in the middle of the experiment breeding bin in a penetrating mode, a filter screen cylinder is installed in the experiment breeding bin, and a support is installed on the bottom face of the experiment breeding bin. And the water suction pump is mounted on the outer surface of the filter box. According to the circulating breeding experiment device, under the action of the water suction pump and the circulating pump, the water suction pipe, the water drainage pipe, the annular pipe and the water spraying head are used in cooperation, breeding water circulation is achieved, marine fish breeding water is automatically cleaned and circulated, the filter screen is used in cooperation, and excrement and fish food residues face the lower portion of the downward inclined end of the filter screen; therefore, the excrement and the fish food residues are piled and collected, trouble and labor are saved, the excrement and the fish food residues are prevented from being retained in the experimental breeding bin to pollute breeding water, the water for marine fish breeding is ensured to be clean, and marine fishes are prevented from getting ill.

Description

Technical Field

[0001] The utility model relates to the technical field of marine fish breeding experiments, in particular to a circulating breeding experimental device. Background Art

[0002] In marine fish recirculating aquaculture experiments or production processes, it is necessary to collect feces for feed digestibility analysis. The traditional collection method is to use a siphon, which is time-consuming and labor-intensive, and the feces floating in the water are not easy to collect. At the same time, the siphon operation will cause stress reactions in farmed fish and shrimp. A filter is installed at the drainage in the middle of the breeding warehouse. Because the filter is located in the middle of the breeding warehouse, it is inconvenient to clean. Long-term use of the filter is prone to adhesion of feces or fish food and other debris, breeding bacteria and affecting fish health.

[0003] However, when the inventor implemented this device, he found the following defects: it is difficult to collect fish feces and fish food residues, which is time-consuming and laborious, and the filter is easy to adhere to feces or fish food and other debris to breed bacteria and affect the health of fish. Utility Model Content

[0004] Based on this, it is necessary to provide a circulating aquaculture experimental device to address the above-mentioned technical problems. Under the action of a water pump and a circulating pump, a water pump, a drainage pipe, a ring pipe and a sprinkler head are used in conjunction to realize the circulation of aquaculture water. The marine fish aquaculture water can be automatically cleaned and circulated, and fish feces and fish food residues can be collected, which saves time and effort, prevents feces and fish food residues from being retained in the experimental aquaculture warehouse and polluting the aquaculture water, and ensures that the marine fish aquaculture water is clean to prevent marine fish from getting sick.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A circulating aquaculture experimental device, comprising:

[0007] An experimental breeding warehouse, wherein a filter box is arranged outside the experimental breeding warehouse, a return pipe is installed through the middle of the experimental breeding warehouse, a filter screen cylinder is installed inside the experimental breeding warehouse, and a bracket is installed on the bottom surface of the experimental breeding warehouse;

[0008] A water pump is installed on the outer surface of the filter box, a water pump pipe and a first drain pipe are installed at both ends of the water pump, and the ends of the water pump pipe and the first drain pipe away from the water pump are respectively installed through the experimental breeding warehouse and the filter box, an inclined filter screen is installed inside the filter box, and the top end of the first drain pipe is located above the filter screen;

[0009] A circulation pump is installed on the outer surface of the filter box and the input end of the circulation pump is installed through the inside of the filter box. A second drain pipe is installed at the output end of the circulation pump. An annular pipe is fixedly connected to the outer surface of the filter box, and the second drain pipe is installed through the annular pipe. A water spray head is installed through the outer surface of the second drain pipe.

[0010] Furthermore, a motor is installed on the outer surface of the experimental breeding warehouse through a bracket, a rotating shaft is rotatably installed on the top of the reflux pipe, a driving gear and a driven gear are respectively installed on the output end of the motor and the outer surface of the rotating shaft, and the driving gear and the driven gear are transmission connected, the outer surface of the rotating shaft is fixedly connected to a mounting plate, the outer surface of the mounting plate is fixedly connected to a cleaning rack, and the outer surface of the cleaning rack is installed with a first brush.

[0011] Furthermore, a scraper is fixedly connected to the bottom surface of the mounting plate, and a second brush is installed on the outer surface of the scraper.

[0012] Furthermore, one end of the cleaning rack away from the mounting plate is fixedly connected to a slide rail, and the slide rail is slidably mounted on the outer surface of the experimental breeding bin.

[0013] Furthermore, a protective shell is rotatably installed through the outer surface of the rotating shaft, and the output end of the motor is rotatably installed through the inside of the protective shell, and the driving gear and the driven gear are both located inside the protective shell.

[0014] Furthermore, a maintenance hole is opened on the outer surface of the protective shell, and a rotating cover is rotatably installed on the outer surface of the protective shell.

[0015] Furthermore, a rotating rod is rotatably installed through the outer surface of the filter box, a nozzle is provided inside the filter box, and the rotating rod is fixedly connected to the nozzle, a flushing pipe is installed through the outer surface of the second drain pipe, and the first valve and the second valve are respectively installed on the outer surfaces of the second drain pipe and the flushing pipe, and the top end of the flushing pipe is installed through the interior of the filter box, and the top end of the flushing pipe is connected to the nozzle.

[0016] Furthermore, one end of the rotating rod away from the spray head is fixedly connected to a handle, and an anti-slip sleeve is arranged on the outside of the handle.

[0017] Furthermore, a sealing door is installed inside the top of the filter box, and the sealing door is made of tempered glass.

[0018] Furthermore, a dosing pipe is installed through the outer surface of the filter box.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The circulating aquaculture experimental device provided by the utility model realizes the circulation of aquaculture water by using a pumping pipe, a first drainage pipe, a second drainage pipe, a ring pipe and a sprinkler head in coordination with the action of a water pump and a circulating pump. The marine fish aquaculture water is automatically cleaned and circulated by using a filter net in coordination with the use of a filter net, and feces and fish food residues are collected below the downwardly inclined end of the filter net, thereby saving trouble and effort, preventing feces and fish food residues from being retained in the experimental aquaculture bin to pollute the aquaculture water, and ensuring that the marine fish aquaculture water is clean to prevent marine fish from getting sick.

[0021] The motor cooperates with the chain to make the driven gear drive the rotating shaft, the mounting plate, the scraper and the cleaning frame to rotate. The rotation of the scraper and the cleaning frame drives the second brush and the first brush to rotate to brush and clean the inner wall of the experimental breeding warehouse and the surface of the filter cylinder, so as to prevent the inner wall of the experimental breeding warehouse and the surface of the filter cylinder from sticking to the debris. This solves the technical problem that a filter cylinder is arranged at the drainage in the middle of the transmission breeding warehouse, because the filter cylinder is located in the middle of the breeding warehouse and is inconvenient to clean, and the filter cylinder is prone to stick to feces or fish food and other debris for a long time, breeding bacteria and affecting the health of fish. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-dimensional structure provided by the utility model;

[0023] Figure 2 A side view schematic diagram of the structure provided by the utility model;

[0024] Figure 3 A schematic diagram of the three-dimensional structure of the cleaning frame and scraper provided by the utility model;

[0025] Figure 4 A schematic diagram of the cross-sectional structure of the filter box provided by the utility model;

[0026] Figure 5 A schematic diagram of the three-dimensional structure of the experimental breeding warehouse provided by the utility model;

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the protective shell provided by the utility model.

[0028] The markings in the figure are as follows:

[0029] Experimental breeding warehouse 1, bracket 2, sprinkler head 3, annular pipe 4, water pump 5, second drainage pipe 6, circulation pump 7, dosing pipe 8, second valve 9, flushing pipe 10, sealing door 11, first valve 12, motor 13, rotating cover 14, filter screen cylinder 15, protective shell 16, rotating shaft 17, reflux pipe 18, cleaning rack 19, filter box 20, rotating rod 21, handle 22, water pump 23, first drainage pipe 24, mounting plate 25, scraper 26, second brush 27, first brush 28, slide rail 29, filter screen 30, driven gear 31, chain 32, driving gear 33, maintenance hole 34, sprinkler 35. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0031] As described in the background art, fish excrement is difficult to collect, is time-consuming and laborious to collect, and the filter is prone to adhesion of excrement or fish food and other debris, breeding bacteria and affecting the health of fish.

[0032] In order to solve this technical problem, the utility model provides a circulating aquaculture experimental device, which is applied to through-type solid phase extraction.

[0033] Specifically, please refer to Figure 1 , 2 , 4 and 5, the automatic column passing device specifically comprises:

[0034] An experimental breeding warehouse 1, a filter box 20 is arranged outside the experimental breeding warehouse 1, a return pipe 18 is installed through the middle of the experimental breeding warehouse 1, a filter screen cylinder 15 is installed inside the experimental breeding warehouse 1, and a bracket 2 is installed on the bottom surface of the experimental breeding warehouse 1;

[0035] A water pump 23 is installed on the outer surface of the filter box 20, and a water pump 5 and a first drain pipe 24 are installed at both ends of the water pump 23, and the ends of the water pump 5 and the first drain pipe 24 away from the water pump 23 are respectively installed through the experimental breeding warehouse 1 and the filter box 20, and an inclined filter screen 30 is installed inside the filter box 20, and the top end of the first drain pipe 24 is located on the upper part of the filter screen 30;

[0036] A circulation pump 7 is installed on the outer surface of the filter box 20, and the input end of the circulation pump 7 is installed through the inside of the filter box 20. A second drain pipe 6 is installed at the output end of the circulation pump 7. An annular pipe 4 is fixedly connected to the outer surface of the filter box 20, and the second drain pipe 6 is installed through the annular pipe 4. A water spray head 3 is installed through the outer surface of the second drain pipe 6.

[0037] The circulating aquaculture experimental device provided by the utility model can start the pumping pump 23 when using the device. The pumping pump 23 draws water in the experimental aquaculture warehouse 1 through the pumping pipe 5 and then introduces it into the filter box 20 above the filter screen 30 through the first drainage pipe 24. The aquaculture water with feces and fish food residues falls on the filter screen 30 and is filtered through. When the filter screen 30 is tilted, the feces and fish food residues are below the downward tilted end of the filter screen 30, so that the feces and fish food residues are piled and collected to prevent the filter screen 30 from being blocked. The circulating pump 7 is powered on and started to draw the filtered water in the filter box 20 through the second drainage pipe 6 into the annular pipe 4 and then discharged into the experimental aquaculture warehouse 1 through the sprinkler head 3, so as to realize the automatic cleaning circulation of marine fish aquaculture water and the collection of fish feces and fish food residues, which saves trouble and labor, prevents feces and fish food residues from being retained in the experimental aquaculture warehouse 1 to pollute the aquaculture water, and ensures that the marine fish aquaculture water is clean to prevent marine fish from getting sick.

[0038] Example 1

[0039] Please refer to Figure 1 , 2 , 4 and 5, a circulating breeding experimental device, an experimental breeding warehouse 1, a filter box 20 is arranged outside the experimental breeding warehouse 1, and a return pipe 18 is installed through the middle of the experimental breeding warehouse 1, a filter screen cylinder 15 is installed inside the experimental breeding warehouse 1, and a bracket 2 is installed on the bottom surface of the experimental breeding warehouse 1; a water pump 23 is installed on the outer surface of the filter box 20, and a water pump pipe 5 and a first drain pipe 24 are installed at both ends of the water pump 23, and the ends of the water pump 5 and the first drain pipe 24 away from the water pump 23 are installed through the experimental breeding warehouse 1 and the filter box 20, respectively, and the filter box 20 is installed with an inclined filter screen 30, and the first row The top of the water pipe 24 is located on the upper part of the filter screen 30; the circulating pump 7 is installed on the outer surface of the filter box 20 and the input end of the circulating pump 7 is installed through the filter box 20, and the output end of the circulating pump 7 is installed with a second drain pipe 6, the outer surface of the filter box 20 is fixedly connected with an annular pipe 4, and the second drain pipe 6 is installed through the annular pipe 4, and the outer surface of the second drain pipe 6 is installed through the sprinkler head 3, so that the automatic cleaning circulation of marine fish farming water and the collection of fish feces and fish food residues can be realized, which saves trouble and labor, prevents feces and fish food residues from being retained in the experimental breeding warehouse 1 to pollute the breeding water, and ensures that the marine fish farming water is clean to prevent marine fish from getting sick.

[0040] Please refer to Figure 1 , 2, 3 and 6, the outer surface of the experimental breeding warehouse 1 is equipped with a motor 13 through a bracket, and the top of the reflux pipe 18 is rotatably equipped with a rotating shaft 17. The output end of the motor 13 and the outer surface of the rotating shaft 17 are respectively equipped with a driving gear 33 and a driven gear 31, and the driving gear 33 and the driven gear 31 are connected by a chain 32. The outer surface of the rotating shaft 17 is fixedly connected with a mounting plate 25, and the outer surface of the mounting plate 25 is fixedly connected with a cleaning frame 19, and the outer surface of the cleaning frame 19 is equipped with a first brush 28, and the bottom surface of the mounting plate 25 is fixedly connected with A scraper 26 is provided, and a second brush 27 is installed on the outer surface of the scraper 26. A slide rail 29 is fixedly connected to one end of the cleaning frame 19 away from the mounting plate 25, and the slide rail 29 is slidably installed on the outer surface of the experimental breeding warehouse 1. A protective shell 16 is rotatably installed through the outer surface of the rotating shaft 17, and the output end of the motor 13 is rotatably installed through the inside of the protective shell 16. The driving gear 33 and the driven gear 31 are both located inside the protective shell 16. A maintenance hole 34 is opened on the outer surface of the protective shell 16, and a rotating cover 14 is rotatably installed on the outer surface of the protective shell 16.

[0041] The circulating breeding experimental device provided in this embodiment, the motor 13 is powered on to start and drive the active gear 33 to rotate, and the chain 32 drives the driven gear 31 and the rotating shaft 17 to rotate, and the rotation of the rotating shaft 17 drives the mounting plate 25, the scraper 26 and the cleaning frame 19 to rotate, and the scraper 26 and the cleaning frame 19 rotate with the second brush 27 and the first brush 28 to brush and clean the inner wall of the experimental breeding warehouse 1 and the surface of the filter screen cylinder 15, so as to prevent the inner wall of the experimental breeding warehouse 1 and the surface of the filter screen cylinder 15 from sticking to the debris cleaning, and solve the transmission breeding warehouse middle A filter screen cylinder 15 is provided at the drainage location. Since the filter screen cylinder 15 is located in the middle of the breeding warehouse and is inconvenient to clean, the filter screen cylinder 15 is prone to adhesion of feces or fish food and other debris for a long time, breeding bacteria and affecting the health of fish. The sliding rail 29 is provided to support the scraper 26 and increase the stability of the scraper 26. The protective shell 16 is provided to protect the transmission mechanism to prevent the movement mechanism from being damaged by external influences. The maintenance hole 34 is provided to facilitate the addition of lubricating oil to the transmission mechanism inside the protective shell 16 for maintenance.

[0042] Example 2

[0043] The automatic column passing device provided in Example 1 is further optimized, specifically, as follows Figure 1 , 2As shown in 4, a rotating rod 21 is rotatably installed on the outer surface of the filter box 20, a nozzle 35 is arranged inside the filter box 20, and the rotating rod 21 is fixedly connected to the nozzle 35, a flushing pipe 10 is installed on the outer surface of the second drain pipe 6, and the first valve 12 and the second valve 9 are respectively installed on the outer surfaces of the second drain pipe 6 and the flushing pipe 10, the top end of the flushing pipe 10 is installed inside the filter box 20, and the top end of the flushing pipe 10 is connected to the nozzle 35, a handle 22 is fixedly connected to the end of the rotating rod 21 away from the nozzle 35, and an anti-slip sleeve is arranged on the outside of the handle 22, and a sealing door 11 is installed inside the top of the filter box 20, and the sealing door 11 is made of tempered glass.

[0044] Through the above structural design, the second valve 9 is opened and the first valve 12 is closed, and the circulating pump 7 draws filtered water from the filter box 20 through the second drain pipe 6 into the flushing pipe 10 and is sprayed out from the nozzle 35 under the filter screen 30 at high pressure. Then, the handle 22 is grasped to rotate the rotating rod 21 and the nozzle 35. The water flow sprayed by the nozzle 35 with high pressure is flushed along the bottom surface of the filter screen 30 as it rotates. The high-pressure water flow reversely flushes the filter screen 30 to flush out impurities in its holes, thereby realizing automatic cleaning of the filter screen 30 and ensuring the filtering effect of the filter screen 30. The sealing door 11 is provided to block the reverse flushing water flow to prevent water splashing and affecting the working environment.

[0045] Example 3

[0046] The automatic column passing device provided in Example 1 or 2 is further optimized, such as Figure 1-3 As shown, a dosing pipe 8 is installed through the outer surface of the filter box 20 .

[0047] In specific implementation, the aquaculture liquid medicine is added into the circulating water circuit through the medicine adding pipe 8, so that the aquaculture liquid medicine is mixed with the aquaculture water more quickly.

[0048] The use process of the automatic column passing device provided by the utility model is as follows:

[0049] The pump 23 is started, and the pump 23 extracts water from the experimental breeding warehouse 1 through the pump pipe 5 and then introduces it into the filter box 20 above the filter screen 30 through the first drain pipe 24. The water with feces and fish food residues for breeding falls on the filter screen 30 and is filtered through. When the filter screen 30 is tilted, the feces and fish food residues are below the downward tilted end of the filter screen 30, so that the feces and fish food residues are piled up and collected to prevent the filter screen 30 from being blocked. The circulation pump 7 is powered on and started to extract the filtered water in the filter box 20 through the second drain pipe 6 into the annular pipe 4 and then discharged into the experimental breeding warehouse 1 through the sprinkler head 3, so as to achieve marine fish breeding. The aquaculture water is automatically cleaned and circulated, and fish feces and fish food residues are collected, which saves trouble and labor, prevents feces and fish food residues from being retained in the experimental aquaculture warehouse 1 to pollute the aquaculture water, ensures that the aquaculture water of marine fish is clean and prevents marine fish from getting sick, the motor 13 is powered on and starts to drive the active gear wheel 33 to rotate, and the chain 32 drives the driven gear 31 and the rotating shaft 17 to rotate, and the rotation of the rotating shaft 17 drives the mounting plate 25, the scraper 26 and the cleaning frame 19 to rotate, and the scraper 26 and the cleaning frame 19 rotate with the second brush 27 and the first brush 28 to rotate to brush and clean the inner wall of the experimental aquaculture warehouse 1 and the surface of the filter screen cylinder 15, so as to prevent the experimental aquaculture warehouse 1 from being damaged. The wall and the surface of the filter screen cylinder 15 are adhered to the debris, and the cleaning solves the technical problem that the filter screen cylinder 15 is arranged at the drainage in the middle of the transmission breeding warehouse. Because the filter screen cylinder 15 is located in the middle of the breeding warehouse and is inconvenient to clean, the filter screen cylinder 15 is easy to adhere to the debris such as feces or fish food for a long time, breeding bacteria and affecting the health of fish. The support of the scraper 26 is realized by the setting of the slide rail 29, and the stability of the scraper 26 is increased. The transmission mechanism is protected by the setting of the protective shell 16 to prevent the transmission mechanism from being damaged by the outside world. The maintenance hole 34 is arranged to facilitate the addition of lubricating oil to the transmission mechanism inside the protective shell 16 for maintenance. For protection, open the second valve 9 and close the first valve 12. The circulating pump 7 draws filtered water from the filter box 20 through the second drain pipe 6 into the flushing pipe 10 and is sprayed out from the nozzle 35 under the filter screen 30 with high pressure. Then, grasp the handle 22 to rotate the rotating rod 21 and the nozzle 35. The water flow sprayed from the nozzle 35 with high pressure will flush along the bottom surface of the filter screen 30 as it rotates. The high-pressure water flow reversely flushes the filter screen 30 to flush out impurities in its holes, thereby realizing automatic cleaning of the filter screen 30 and ensuring the filtering effect of the filter screen 30. The sealing door 11 is provided to block the reverse flushing water flow to prevent water splashing and affecting the working environment.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A circulating aquaculture experimental device, characterized in that: It includes: An experimental breeding warehouse (1), wherein a filter box (20) is arranged outside the experimental breeding warehouse (1), a return pipe (18) is installed through the middle of the experimental breeding warehouse (1), a filter screen cylinder (15) is installed inside the experimental breeding warehouse (1), and a bracket (2) is installed on the bottom surface of the experimental breeding warehouse (1); A water pump (23) is installed on the outer surface of the filter box (20), and a water pump (5) and a first drainage pipe (24) are installed at both ends of the water pump (23), and the ends of the water pump (5) and the first drainage pipe (24) away from the water pump (23) are respectively installed through the experimental breeding warehouse (1) and the filter box (20), and an inclined filter screen (30) is installed inside the filter box (20), and the top end of the first drainage pipe (24) is located above the filter screen (30); A circulation pump (7) is installed on the outer surface of the filter box (20) and the input end of the circulation pump (7) is installed through the inside of the filter box (20); a second drainage pipe (6) is installed at the output end of the circulation pump (7); an annular pipe (4) is fixedly connected to the outer surface of the filter box (20), and the second drainage pipe (6) is installed through the annular pipe (4); and a water spray head (3) is installed through the outer surface of the second drainage pipe (6).

2. The circulating aquaculture experimental device according to claim 1, characterized in that: The outer surface of the experimental breeding warehouse (1) is equipped with a motor (13) via a bracket, a rotating shaft (17) is rotatably mounted on the top end of the return pipe (18), a driving gear (33) and a driven gear (31) are respectively mounted on the output end of the motor (13) and the outer surface of the rotating shaft (17), and the driving gear (33) and the driven gear (31) are connected by a chain (32) in a transmission manner, the outer surface of the rotating shaft (17) is fixedly connected with a mounting plate (25), the outer surface of the mounting plate (25) is fixedly connected with a cleaning frame (19), and the outer surface of the cleaning frame (19) is equipped with a first brush (28).

3. The circulating aquaculture experimental device according to claim 2, characterized in that: A scraper (26) is fixedly connected to the bottom surface of the mounting plate (25), and a second brush (27) is mounted on the outer surface of the scraper (26).

4. The circulating aquaculture experimental device according to claim 3, characterized in that: One end of the cleaning rack (19) away from the mounting plate (25) is fixedly connected to a slide rail (29), and the slide rail (29) is slidably mounted on the outer surface of the experimental breeding bin (1).

5. The circulating aquaculture experimental device according to claim 4, characterized in that: A protective shell (16) is rotatably mounted through the outer surface of the rotating shaft (17), and an output end of the motor (13) is rotatably mounted through the inside of the protective shell (16). Both the driving gear (33) and the driven gear (31) are located inside the protective shell (16).

6. The circulating aquaculture experimental device according to claim 5, characterized in that: A maintenance hole (34) is provided on the outer surface of the protective shell (16), and a rotating cover (14) is rotatably mounted on the outer surface of the protective shell (16).

7. The circulating aquaculture experimental device according to claim 6, characterized in that: A rotating rod (21) is rotatably mounted on the outer surface of the filter box (20), a nozzle (35) is arranged inside the filter box (20), and the rotating rod (21) is fixedly connected to the nozzle (35), a flushing pipe (10) is mounted on the outer surface of the second drainage pipe (6), and a first valve (12) and a second valve (9) are mounted on the outer surfaces of the second drainage pipe (6) and the flushing pipe (10), respectively, and the top end of the flushing pipe (10) is mounted inside the filter box (20), and the top end of the flushing pipe (10) is connected to the nozzle (35).

8. The circulating aquaculture experimental device according to claim 7, characterized in that: One end of the rotating rod (21) away from the spray head (35) is fixedly connected to a handle (22), and an anti-slip sleeve is arranged outside the handle (22).

9. The circulating aquaculture experimental device according to claim 8, characterized in that: A sealing door (11) is installed inside the top end of the filter box (20), and the sealing door (11) is made of tempered glass.

10. The circulating aquaculture experimental device according to claim 9, characterized in that: A dosing pipe (8) is installed through the outer surface of the filter box (20).

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