Separating tank device

Abstract

The utility model discloses a separating tank device, including separating box, separating box bottom inclination setting, fry swims from low position to high position of separating box body, separating box body includes the mixing area, opposite static area and counter current area who set up in order from low position to high position, is provided with the fish inlet of throwing fry to separating box body in the end of mixing area far from opposite static area, is provided with the first water inlet of separating box body water inlet and the fish outlet of fry swimming out separating box body in the end of counter current area far from opposite static area. Set up separating box body, set up the bottom of separating box body to the inclination state simultaneously, throw fry from low position, let fry swim to high position, water inlet from high position simultaneously, make the reverse flow of fry, in view of the counter current habit of fry, can let the fry that has the strong swimming ability of development completely swim out from the fish outlet.

Description

Technical Field

[0001] This utility model relates to the field of fish fry screening, and in particular to a separation tank device. Background Technology

[0002] Generally, fish fry need to be screened before being stocked in ponds. This ensures a high survival rate and allows for separate stocking and management based on size. Currently, the common method involves catching the fry and placing them in a tank, then visually sorting them into different buckets. However, this method relies heavily on the experience of skilled workers, and inconsistent standards often lead to prolonged sorting times, poor grading efficiency, and ultimately, low survival rates. Furthermore, the bumpy transport process inevitably causes the protective mucus on the fry's surface to detach, and damages their scales.

[0003] Furthermore, in general, only the size of the fish fry is used for screening and classification, without sorting them by whether they are strong or weak and diseased. Therefore, there is an urgent need for a device that can screen the physical condition of fish fry. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a separation tank device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a separation tank device, including a separation box, the bottom of which is inclined, and fish fry swim from the lower position to the higher position of the separation box. The separation box includes a mixing zone, a relatively still zone, and a counter-current zone arranged sequentially from the lower position to the higher position. An inlet for releasing fish fry into the separation box is provided at the end of the mixing zone away from the relatively still zone. A first water inlet for introducing water into the separation box and an outlet for the fish fry to swim out of the separation box are provided at the end of the counter-current zone away from the relatively still zone.

[0006] More specifically, a second inlet is provided at the end of the mixing zone away from the relatively still zone, through which water enters and flows into the countercurrent zone.

[0007] More specifically, an orifice plate is provided on the first water inlet.

[0008] More specifically, a fish collecting frame is provided at the fish outlet, a fish blocking plate is provided on the fish collecting frame, and a water outlet hole is provided on the fish blocking plate.

[0009] More specifically, an overflow area is provided at one end of the separation box, and the fish-blocking plate is disposed between the overflow area and the fish-collecting frame.

[0010] More specifically, a water storage space and an overflow component are provided in the overflow area, and the overflow component connects the water storage space with the external area.

[0011] More specifically, the overflow component includes an inner tube and an outer tube sleeved outside the inner tube. The outer tube is higher than the inner tube. A third water inlet is opened at the bottom of the outer tube. An overflow outlet is opened at the top of the inner tube. A water outlet is opened at the bottom of the inner tube. Water is drained to the external area through the water outlet.

[0012] More specifically, the height of the overflow outlet is flush with the top of the fish collection frame.

[0013] More specifically, the separation box is surrounded by a perforated plate.

[0014] More specifically, a sludge collection tank is provided inside the separation box. The sludge collection tank is located at the end of the mixing zone away from the relatively static zone and is lower than or equal to the lowest end of the mixing zone.

[0015] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0016] Set up a separation tank with its bottom tilted. Release fish fry from the lower position, allowing them to swim towards the higher position and exit through the higher outlet. Simultaneously, water enters from the higher position, causing the fry to flow in the opposite direction. Given the fry's reverse swimming habit, fully developed fry with strong swimming abilities can swim out through the outlet, while underdeveloped fry remain in a relatively still area. Dead or poorly developed fry accumulate or swim in the mixing area, allowing for rapid fry selection that saves time and effort. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 ;

[0020] Figure 3 This is the utility model Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a three-dimensional structural diagram of the separation box of this utility model;

[0022] Figure 5 This is a three-dimensional structural diagram of the support frame of this utility model. Figure 1 ;

[0023] Figure 6 This is a three-dimensional structural diagram of the support frame of this utility model. Figure 2 ;

[0024] Figure 7 This is a three-dimensional structural diagram of the fish collection frame of this utility model;

[0025] Figure 8 This is a three-dimensional structural diagram of the water outlet cylinder of this utility model;

[0026] Figure 9 This is a three-dimensional structural diagram of the overflow component of this utility model;

[0027] In the diagram: 1. Support shell; 11. Sludge collection tank area; 111. Sludge collection outlet; 12. Fish collection area; 121. Fish collection outlet; 13. Overflow area; 131. Drainage outlet; 14. Stainless steel mesh plate; 2. Separation box; 21. Mixing area; 211. Fish inlet; 22. Relatively static area; 23. Countercurrent area; 231. Water outlet cylinder; 232. First water inlet; 233. Perforated plate; 24. Fish outlet; 25. Fish collection frame; 251. Fish collection overflow hole; 26. Fish baffle plate; 261. Water outlet; 4. Overflow component; 41. Inner pipe; 51. Outer pipe; 511. Third water inlet. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] It should be understood that the accompanying drawings are for illustrative purposes only.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0032] A separation tank device, such as Figures 1-9 As shown, it includes a support housing 1 and a separation box 2 disposed within the support housing 1. The support housing 1 has two areas, namely an overflow area 13 and a screening area.

[0033] The separation box 2 is set in the screening area. After the separation box 2 is placed in the screening area, there is a gap between the two sides of the separation box 2 and the supporting shell 1. The gap forms an overflow channel. The separation box 2 is set as a trough with an opening at the top, surrounded on all four sides, and a bottom plate is set at the bottom. The bottom plate is set at an inclination. The water level in the separation box 2 should be higher than the highest point of the inclination bottom plate to provide sufficient water for the fish fry to swim and facilitate the screening of the fish fry. Fluctuations in the water level within the separation tank 2 will not have a significant impact. However, to better screen the fish fry, it is necessary to maintain a relatively stable water level within the separation tank 2. Therefore, an outlet is provided on the separation tank 2 to discharge water when there is a large volume of water inside, thus maintaining the water level. Furthermore, drainage plates are provided on both sides of the separation tank 2, and the outlets are located on these drainage plates. Several outlets are arranged in an array on the drainage plates to form an outlet plate. Moreover, the outlet plate is a stainless steel mesh plate 14, which facilitates the overflow of water from the separation tank 2 to the outside. Because there is a gap between the separation tank 2 and the supporting shell 1, the overflowing water can enter the overflow channel between the supporting shell 1 and the separation tank 2.

[0034] Overflow channels are formed on both sides of the separation tank 2 and the supporting shell. Water overflowing from the separation tank 2 enters the overflow area 13 through the overflow channels. The overflow area 13 receives the water overflowing from the separation tank 2 and transports the overflow water to the external area. The water transported out from the overflow area 13 can be reused, realizing full recovery of overflow water, reducing water consumption, significantly improving water-saving efficiency, reducing water waste, and reducing losses.

[0035] The supporting shell 1 can be flexibly set up to stably support and set up the separation box 2 in any desired placement area. The support legs of the supporting shell 1 are designed to be adjustable to ensure that the separation box 2 remains stable and safe in the designated position, while ensuring that the bottom of the separation box 2 is tilted and the tilt angle meets the design requirements. Whether indoors or outdoors, whether the ground is flat or not, it can adapt to different environments and space requirements.

[0036] To facilitate the screening of fish fry's physical condition, the bottom of the separation box 2 is tilted at an angle of 2-5°. Further, the tilt angle of the bottom of the separation box 2 is set to 3°. At the same time, the fish fry swim from the lower to the higher position of the separation box 2. By swimming from the lower to the higher position, fish fry with different physical conditions can be screened out. Finally, the fish fry that can swim from the lower to the higher position are the fully developed fish fry with strong swimming ability.

[0037] The separation box 2 includes a mixing zone 21, a relatively still zone 22, and a counter-current zone 23 arranged sequentially from low to high. A second water inlet is provided at the end of the mixing zone 21 away from the relatively still zone 22 to allow water to enter the separation box 2. When screening fish fry, the water flow speed must be controlled to avoid excessive or insufficient impact on the fish fry, which would result in poor screening quality. At the same time, relative water flow is achieved. Therefore, a second water inlet is provided at the end of the mixing zone 21 away from the relatively still zone 22. Water enters from the second water inlet and flows towards the counter-current zone 23. Water flows against each other on both sides to ensure the flow rate. Of course, the water volume entering through the inlet can also be controlled. Water entering from both ends of the separation box 2 can ensure that the water flow is relatively still in the relatively still zone 22.

[0038] There are three ways to release fish fry:

[0039] In the first method, a fish inlet 211 for feeding fish into the separation box 2 is provided at the end of the mixing zone 21 away from the relatively static zone 22. Fish fry are released from the fish inlet 211 and swim from the mixing zone 21 to the counter-current zone 23. This is to prevent dead fish, dead eggs or impurities from remaining in the mixing zone 21.

[0040] In the second method, the fish inlet 211 and the second water inlet are the same. The fish fry and the water enter the separation box 2 together and swim from the mixing zone 21 to the counter-current zone 23. In order to prevent dead fish, dead eggs or impurities from staying in the mixing zone 21, the second method is adopted in this solution.

[0041] The third method involves not setting up a separate fish inlet, but instead placing the fish fry into the separation box 2 from above, and having them swim towards the upstream swimming area 23.

[0042] A sludge collection tank is provided inside the separation box 2. The sludge collection tank is located at the end of the mixing zone 21 away from the relatively static zone 22. Because of the inclined angle of the bottom of the separation box 2, it is convenient for dead fish, dead eggs or impurities to enter the sludge collection tank. Moreover, the fish fry and water enter at a certain speed to prevent the fish fry from entering the sludge collection tank.

[0043] The sludge collection tank can be configured as a movable frame. A corresponding sludge collection tank area 11 is set on the supporting shell 1. The frame is placed in the sludge collection tank area 11. When the frame is filled with dead fish, dead eggs, or other impurities, the movable frame is removed, replaced, or cleaned, and then placed back into the sludge collection tank area 11. Alternatively, a corresponding sludge collection tank area 11 can be directly set on the supporting shell 1. The bottom of the sludge collection tank area 11 is inclined to facilitate the accumulation of dead fish, dead eggs, or other impurities on one side, making cleaning and water flow out easily. At the same time, a sludge collection outlet 111 is set on the sludge collection tank area 11. The sludge collection outlet 111 is located near the lower part of the sludge collection tank area 11. The sludge collection outlet 111 is used not only to drain the water in the separation tank 2, but also to drain dead fish, dead eggs, or other impurities. The bottom of the sludge collection tank area 11 is lower than the bottom of the separation tank 2.

[0044] The water flow in the relatively still zone 22 is relatively still, and the fish swimming from the mixing zone 21 gather here. The relatively still zone 22 mainly gathers underdeveloped or deformed fish fry.

[0045] Fish fry swimming out of the relatively still zone 22 enter the reverse zone 23. A first water inlet 232 for water to enter the separation box 2 is provided at the end of the reverse zone 23 away from the relatively still zone 22. A perforated plate 233 is provided on the first water inlet 232. Therefore, the water flow velocity in the reverse zone 23 is greater than that in the relatively still zone 22, making it more difficult for the fish fry to swim. This allows for the selection of stronger fish fry. The fish fry swim through the reverse zone 23 and swim out of the separation box 2 from the fish outlet 24 located in the reverse zone 23 away from the relatively still zone 22, and eventually gather together.

[0046] A water outlet cylinder 231 is provided at the first water inlet 232. The two ends of the water outlet cylinder 231 are fixed to the two sides of the separation box 2. There is a gap between the bottom of the water outlet cylinder 231 and the bottom of the separation box 2. The space between the bottom of the water outlet cylinder 231 and the bottom of the separation box 2 is the fish outlet 24. Strong fish fry with strong swimming ability swim out from the fish outlet 24. The first water inlet 232 is located on the side of the water outlet cylinder 231 away from the countercurrent zone 23. The perforated plate 233 is located on the side of the water outlet cylinder 231 close to the countercurrent zone 23 and faces the mixing zone. The first water inlet 232 connects to an external water source and enters the separation tank 2 through the perforated plate 233. By setting the perforated plate 233, water can enter the separation tank 2 more evenly, preventing rapid water intake from one side and affecting the final selection of fish fry. At the same time, after the water enters the water outlet cylinder 231 from the external water inlet, it can be distributed within the water outlet cylinder 231 to avoid uneven water flow.

[0047] A fish collection area 12 is provided at the end of the separation box 2 near the reverse swimming area 23, that is, a fish collection area 12 is provided at the fish outlet 24. The fish collection area 12 is set at the bottom, and the fish fry swimming out of the fish outlet 24 enter the fish collection area 12. In order to ensure the water level in the separation box 2, the fish collection area 12 will always be filled with water. In order to further ensure the water level is maintained, and at the same time, the water can be drained cleanly when drainage is needed, a fish collection outlet 121 is opened at the bottom of the fish collection area 12 to transport water to the external area. The bottom of the fish collection area 12 is set at an angle to facilitate the drainage of water in the fish collection area 12.

[0048] Directly allowing fish fry to enter the fish collection area 12 would be inconvenient and could easily damage them. Therefore, a fish collection frame 25 is provided in the fish collection area 12. After the fish fry swim out of the upstream swimming area 23, they swim directly into the fish collection frame 25. The top of the fish collection frame 25 is flush with the fish outlet 24 of the upstream swimming area 23 to facilitate the collection of fish fry. The fish collection frame 25 is movable and has a handle. After the fish collection frame 25 is full of fish fry, it can be lifted directly to facilitate the collection of fish fry and prevent damage to them. A fish collection frame 25 is provided with a fish collection overflow hole 251, which is located on the upper part of the fish collection frame 25. The fish collection overflow hole 251 is designed to ensure that there is sufficient water in the fish collection frame 25 for the fish fry to survive. When the fish collection frame 25 is lifted away, excess water flows out from the fish collection overflow hole 251. The top of the fish collection frame 25 is provided with an outward-facing flange, so that the fish collection frame 25 can be placed on the separation box 2.

[0049] The depth of the fish collection area 12 is greater than or equal to the depth of the fish collection frame 25. Furthermore, the depth of the fish collection area 12 is greater than the depth of the fish collection frame 25. Water flowing out from the fish collection overflow hole 251 can directly enter the fish collection area 12. Of course, the fish collection frame 25 may not be provided in the fish collection area 12.

[0050] To maintain the water level within the separation tank 2, water continuously enters from both ends of the separation tank 2, causing water to flow towards the external support shell 1. This flow typically occurs through the stainless steel mesh plates 14 on both sides of the separation tank 2. However, when the water volume is large, the mesh plates 14 alone are insufficient. Therefore, a fish-blocking plate 26 is installed on one side of the fish collection area 12. This plate has water outlet holes 261 and is located on the side away from the counter-current zone 23. Water flows through the outlet holes 261 towards the overflow area. The fish-blocking plate 26 can be a separate plate or the outlet holes 261 can be directly formed on the enclosure of the separation tank 2, saving materials.

[0051] During the screening of fish fry, it may involve batch screening or the fish collection frame 25 being full. After the first batch of fish fry is screened or the fish collection frame 25 is full, the fish collection frame 25 needs to be removed. At this time, the fish outlet 24 needs to be blocked to prevent the second batch of fish fry from flowing directly into the fish collection placement area 12. Therefore, a placement groove is set on the separation box 2, and a baffle plate is inserted in the placement groove. In this solution, the placement groove is set as a support clamp, and the support clamp is set as two sets of support components. Each set of support components includes two support columns. A groove space is left between the two support columns for the baffle plate to be inserted. A guide chamfer is set on the support column to facilitate the insertion of the baffle plate.

[0052] After the separation box 2 is placed inside the supporting shell 1, an overflow area 13 is formed at the other end of the supporting shell 1. That is, an overflow area 13 is provided at one end of the separation box 2. The fish-blocking plate 26 is located between the overflow area 13 and the fish-collecting frame 25, and the bottom edge of the fish-blocking plate 26 is flush with the top of the fish-collecting frame 25. The overflow area 13 is set at a lower position to facilitate the flow of overflow water to the overflow area 13. At the same time, since the separation box 2 is set at an angle, the lowered overflow area 13 can directly utilize the height of the separation box 2 without having to expand upwards to increase the volume of the overflow area 13.

[0053] The overflow area 13 is provided with a water storage space and an overflow component 4 disposed within the water storage space. Water in the separation box 2 flows into the water storage space through the water outlet 261 on the fish-blocking plate 26 and the water outlet plates on both sides, and collects in the water storage space. The overflow component 4 connects the water storage space with the external area and transports the water in the water storage space to the external area. A drain outlet 131 is provided on the water storage space, and the water outlet of the overflow component 4 is connected to the drain outlet 131 to transport the water in the water storage space to the external area.

[0054] The overflow component 4 includes an inner pipe 41 and an outer pipe 51 sleeved outside the inner pipe 41, forming a water outlet space between the inner pipe 41 and the outer pipe 51. The inner pipe 41 is connected to the drain outlet 131. The outer pipe 51 is higher than the inner pipe 41. A third water inlet 511 is provided at the bottom of the outer pipe 51, and an overflow outlet is provided at the top of the inner pipe 41. The third water inlet 511 can be provided only once at the bottom of the outer pipe 51, or several can be evenly provided around the outer pipe 51. To increase the drainage speed, several third water inlets 511 are provided at the bottom of the outer pipe 51, and the several third water inlets 511 are evenly arranged at the bottom of the outer pipe 51.

[0055] Water enters the outlet space from the third inlet 511, and as more and more water enters, the water level in the outlet space rises until it is level with the overflow port of the inner pipe 41. Water then enters the inner pipe 41 through the overflow port and is finally discharged through the drain port 131.

[0056] The height of the overflow port is set according to the water level of the separation tank 2 to facilitate control of the water volume in the overflow area 13. In this scheme, the height of the overflow port is higher than the highest point of the inclined bottom of the separation tank 2.

[0057] The principle of the separation tank device is as follows:

[0058] Close the wastewater outlet 111 and the fish outlet 121, and supply water into the separation tank 2. The water slowly fills the wastewater collection tank and the fish placement area 12 until the water level is higher than the highest point of the bottom of the separation tank 2. Stop supplying water when the water level reaches the set level to ensure the fish fry can swim to the fish outlet 24. The fish fry and water enter the separation tank 2 through the second inlet, and the first inlet 232 also begins to supply water, creating a reverse-swimming environment for the fish fry. This allows for selection; strong and capable fish swam out through the fish outlet and into the fish collection frame 25. Less robust fish remained in the relatively still area 22, while dead fish and impurities remained in the mixing area 21 or merged into the wastewater collection area. As the water supply gradually increases, the water in the separation tank 2 flows out from both sides... Stainless steel mesh plate 14 enters the support shell 1 and flows to the overflow area 13 through the overflow channel, or enters the water storage space of the overflow area 13 from the fish blocking plate 26 on one side of the fish collection frame 25. The water in the water storage space enters the water outlet space through the third water inlet 511 and enters from the overflow port of the inner pipe 41 and finally flows out, ensuring the water level in the separation box 2. If the fish collection frame 25 is full and the first batch of fish fry screening is completed, a baffle plate is set to prevent the fish from swimming to the fish outlet 24. At the same time, the fish collection frame 25 is lifted away. After the fish collection frame 252 is lifted, the excess water flows out from the fish collection overflow hole 251 on the fish collection frame 5. When the separation is completed, the sludge outlet 111 and the fish outlet 121 are fully opened to completely discharge dead fish, impurities and water from the separation box 2.

[0059] This utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0060] A separation tank 2 is set up with its bottom tilted. Fish fry are released from the lower position, allowing them to swim to the higher position and exit through the fish outlet 24. Water enters from the higher position, causing the fish fry to flow in the opposite direction. Given the fish fry's reverse swimming habit, fully developed fish fry with strong swimming ability can swim out of the fish outlet 24, while underdeveloped fish fry remain in the relatively still area 22. Dead or poorly developed fish fry accumulate or swim in the mixing area 21, allowing for quick and efficient selection of fish fry. A sludge collection trough is set up to collect dead fish, dead eggs, and other impurities. A fish collection frame 25 is set up to collect strong and healthy fish fry with strong swimming ability. An overflow device 4 is set up to discharge the overflowing water to the outside space.

[0061] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

[0062] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0063] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0064] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A separation tank device, characterized in that: The system includes a separation tank (2), the bottom of which is inclined and the water level in the separation tank (2) is higher than the highest point of the inclined bottom. The separation tank (2) includes a mixing zone (21), a relatively still zone (22), and a counter-current zone (23) arranged sequentially from low to high. A second water inlet for water to enter the separation tank (2) is provided at the end of the mixing zone (21) away from the relatively still zone (22). A first water inlet (232) for water to enter the separation tank (2) and a fish outlet (24) for fish fry to swim out of the separation tank (2) are provided in the counter-current zone (23). The first water inlet (232) and the fish outlet (24) are both located at the end of the counter-current zone (23) away from the relatively still zone (22). A water outlet is provided on the separation tank (2).

2. The separation tank device according to claim 1, characterized in that: A water outlet cylinder (231) is provided on the first water inlet (232). The two ends of the water outlet cylinder (231) are connected to the two sides of the separation box (2). A perforated plate (233) is provided on the water outlet cylinder (231), and the perforated plate (233) is arranged facing the mixing zone (21).

3. The separation tank device according to claim 1, characterized in that: The separation box (2) is provided with drainage plates on both sides, and the water outlet is provided on the drainage plate. Several water outlets are provided, and several arrays of water outlets are provided on the drainage plate. A support shell (1) is provided on the outside of the separation box (2), and an overflow channel is formed between the support shell (1) and the separation box (2). An overflow area (13) is provided on the support shell (1), and the overflow channel is connected to the overflow area (13).

4. The separation tank device according to claim 3, characterized in that: The overflow area (13) is provided with a water storage space and an overflow component (4) provided in the water storage space, the overflow component (4) connecting the water storage space with the external area.

5. The separation tank device according to claim 4, characterized in that: A drain outlet (131) is provided in the water storage space. The overflow component (4) includes an inner pipe (41) and an outer pipe (51) sleeved outside the inner pipe (41). A water outlet space is formed between the outer pipe and the inner pipe. The inner pipe is connected to the drain outlet (131). The outer pipe (51) is higher than the inner pipe (41). A third water inlet (511) is opened at the bottom of the outer pipe (51). An overflow outlet is opened at the top of the inner pipe (41).

6. The separation tank device according to claim 5, characterized in that: The overflow outlet is higher than the highest point of the sloping bottom.

7. The separation tank device according to claim 1, characterized in that: A placement slot is provided on the separation box (2), and a baffle plate is inserted in the placement slot to prevent the fish fry from swimming toward the fish outlet (24).

8. The separation tank device according to claim 3, characterized in that: A fish collection and placement area (12) is provided at the fish outlet (24), and a fish blocking plate (26) is provided on one side of the fish collection and placement area (12). A water outlet hole (261) is provided on the fish blocking plate (26), and the fish blocking plate (26) is located between the overflow area (13) and the fish collection and placement area (12).

9. The separation tank apparatus according to claim 8, characterized in that: A fish collection frame (25) is provided in the fish collection area (12).

10. The separation tank apparatus according to claim 1, characterized in that: A sludge collection tank is provided inside the separation box (2), and the sludge collection tank is located at one end of the mixing zone (21) away from the relatively static zone (22).

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