Device for Intelligent Purification of Aquaculture Tail Water of Marine Shrimps and Crabs

Abstract

The present invention discloses a device for intelligent purification of tail water of shrimp and crab breeding in seawater, which belongs to the technical field of tail water treatment, and includes a purification pool and a filter pool which are connected and arranged. A circulation component is arranged at the center position of the purification pool, and the circulation component includes a circular plate with a central opening, a guide sleeve, and an aeration head. The circular plate is arranged at intervals up and down, the guide sleeve is fixed to the central hole of the circular plate, the aeration head is arranged at the bottom of the guide sleeve, and a dirt collection net for filtering and collecting dirt is arranged above the circular plate at the top. A planting matrix is ​​arranged outside the dirt collection net, and a rotating component is arranged at the water flow inlet position in the purification pool. The present invention can exchange water layers through the circulation component, realize the floating collection of dirt, and cooperate with the rotating component to prevent blockage, and has the advantages of efficient and stable purification effect and easy cleaning.

Description

Technical Field

[0001] The present invention belongs to the technical field of tail water treatment, and particularly relates to a device for intelligent purification of seawater shrimp and crab aquaculture tail water. Background Art

[0002] Seawater shrimps and crabs are important aquaculture varieties in China, including whiteleg shrimp, kuruma prawn, swimming crab, mud crab, etc. To meet the market demand, farmers usually use special aquaculture ponds for farming to increase aquaculture production and expand the aquaculture scale. A large amount of tail water is generated during the aquaculture process. The tail water contains a large number of toxic and harmful substances such as food residues, animal feces, and suspended solids in the water body. It is necessary to effectively treat the tail water to meet the discharge standards and prevent environmental pollution.

[0003] Most of the existing tail water treatment methods use biological balls, filters, etc. to filter and treat the tail water. However, the water body flowing unidirectionally for a long time carries impurities and easily clogs the filter screen, affecting the filtration efficiency. And the method of using plants to remove ammonia and nitrogen nutrients is easily affected by the fact that a large amount of suspended solids are difficult to stably sink to the bottom and contact with the plants, which also affects the purification and filtration efficiency.

[0004] The US patent with the application number US14662445 discloses a filtration device for filtering wastewater. The invention includes a drum rotating around an axis, a plurality of filter disks arranged at axial intervals, the filter disks and the drum can be driven to rotate, the filter disks have parallel filter surfaces, each filter disk has two filter surfaces extending parallel to each other in each case, the two filter surfaces define a plurality of hollow spaces arranged circumferentially along the corresponding filter disk, and are fluidly connected to each other. The hollow spaces are fluidly connected to the drum through one or more inlets, so that the wastewater to be filtered can flow from the inside of the drum through the inlets into the hollow spaces, and the filtrate can flow to the outside through the filter surfaces. This invention can well achieve multi-layer filtration of sewage and improve the filtration effect and efficiency. However, the invention still has the following deficiencies: when treating aquaculture tail water, a large amount of suspended solids may clog the filter layer, resulting in a reduction in the purification effect, and the dirt in the water body adheres to the pool wall and needs to be removed manually, increasing the cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for intelligent purification of seawater shrimp and crab aquaculture tail water that can stably purify water and is easy to clean.

[0006] The technical solution adopted by the present invention to achieve the above purpose is as follows:

[0007] Device for intelligent purification of tail water in seawater shrimp and crab farming, comprising: a purification pond and a filtration pond connected by pipelines. A circulation component is provided in the center of the purification pond. The circulation component includes circular plates arranged at intervals up and down. The center of the circular plate is provided with an opening and a diversion sleeve, and an aeration head is arranged in the diversion sleeve at the bottom. The aeration head aerates the water body to form bubbles. The bubbles rise from the bottom of the water body to the top of the water body and gradually increase, which is beneficial to increasing the oxygen content of the pool water and the oxidation and degradation of organic matter. The rising bubbles are accelerated by multiple diversion sleeves, forming a flow velocity difference between the center and the outside of the circular plate, thus forming a pressure difference, so that the pool water outside the circular plate is continuously sucked into the center of the circular plate from the gaps between adjacent circular plates, realizing the exchange of the upper and lower water layers and the inner and outer water layers. This not only improves the decomposition effect of bubbles on organic matter in water, but also avoids the reaction pollution of the pool water caused by the deposition and accumulation of dirt at the bottom. Through one aeration, the oxygenation and purification of the whole pool of water are realized, saving costs and energy consumption.

[0008] Preferably, the diversion sleeve includes a circular ring fixed to the central hole of the circular plate. A plurality of diversion plates are arranged in a conical shape at the upper end of the circular ring. The top ends of the diversion plates are inwardly converged and located inside the circular ring above them. The plurality of diversion plates form a conical sleeve converging upward and inward. On the one hand, by increasing the passing speed of the bubbles, the pressure difference is increased, further improving the rate of water body exchange. On the other hand, the suspended pollutants in the pool water are diverted to the inside of the circular plate. The diversion plates help to guide the pollutants upward. The bubbles generated by the aeration head cause the diversion plates to vibrate relative to the circular ring, which is beneficial to preventing flocculent pollutants from blocking the outside of the diversion sleeve and preventing water body exchange, and also reducing the possibility of dirt adhering to the inside of the diversion sleeve.

[0009] Preferably, a dirt collection net is fixed above the circular plate at the top. The dirt collection net includes a top plate. A bottom plate connected to the outside and downward is connected below the top plate. The bottom plate is embedded with a perforated filter plate. The center of the bottom of the top plate is provided with a diffusion member. The diffusion member is conical and the converging end of the cone faces downward. The suspended pollutants in the water body are continuously diverted into the diversion sleeve and discharged to the bottom of the top plate along with the bubbles to the water surface. After the water body, bubbles and pollutants contact the diffusion member, they are dispersed to the outside and onto the bottom plate. The water body enters the pool water through the filter plate, and the pollutants remain above the filter plate and are collected by the carrying bottom plate, forming the filtration and collection of suspended substances at the top layer, purifying the water quality. And the continuously emerging bubbles will continuously wash the filter plate. On the one hand, it is convenient for pollutants to enter the bottom corner of the bottom plate for collection. On the other hand, it prevents pollutants from blocking the filter plate and affecting the water body exchange and purification in the pool.

[0010] Preferably, a water delivery pipe is coaxially inserted into the diffuser. One end of the water delivery pipe extends out of the conical top of the diffuser and is provided with a cross-shaped silica gel valve that allows water to flow downward unidirectionally. The other end of the water delivery pipe is connected to a pump body and a clean water source. After the purification tank completes water purification, the water is discharged. The clean water source pumps the clean water from the water delivery pipe through the pump body. The water flows downward, contacts each deflector plate, and then is deflected to the gap between adjacent circular plates and flows outwards at a high speed, forming a scouring of the upper and lower end faces of the circular plates, the flow guide sleeve, and the inner wall of the purification tank, removing the attached pollutants, which is beneficial to reducing the cost of manual cleaning. The convex direction of the cross-shaped silica gel valve is downward, blocking the entry of pollutants into the water delivery pipe while realizing the discharge and cleaning of water.

[0011] Preferably, a plurality of fixing rods are connected between the circular plates at the bottom and the top. The fixing rods pass through the circular plates between the top and the bottom and the two can slide relative to each other. Springs are sleeved on the fixing rods between adjacent circular plates. The springs realize the elastic sliding of the circular plates in the middle position. The water deflected by the deflector plates impacts the circular plates, causing the circular plates in the middle to squeeze the springs and slide on the fixing rods, so that the height of the water ejected from between the circular plates changes, expanding the flushing range of the inner wall of the purification tank and further improving the cleaning effect. At the same time, during the process of water circulation and filtration by the aeration head, the circular plates can also slide up and down to shake off the dirt attached to their upper and lower end faces, improving the filtration effect of the water.

[0012] Preferably, a water level sensor is provided on the inner wall of the purification tank. The position height of the water level sensor is between the circular plate at the top and the filter plate. An electric control valve is provided on the pipeline connecting the purification tank and the filtration tank. The water level sensor is electrically connected to the electric control valve. When the water discharged from the filtration tank into the purification tank reaches the position of the water level sensor, the water level sensor controls the electric control valve to stop injecting water, keeping the liquid level between the circular plate at the top and the filter plate. At this time, the dirt collected between the bottom plate and the top plate is above the water surface. The rising bubbles carry water into the bottom plate at the center of the circular plate at the top. Under the action of gravity, the water passes through the filter plate and is filtered back into the pool water, realizing the separation and collection of pollutants at the top and the water body, preventing the pollutants from soaking in the water for a long time to produce toxic substances and stink. At the same time, when the water filtered by the filter plate falls back into the pool water, it can also contact the air, which helps to increase the oxygen content of the water, reduce the energy consumption of the aeration head, and improve the purification efficiency.

[0013] Preferably, a planting matrix is provided on the inner wall of the purification tank. The planting matrix is filled with planting filter materials and planted with aquatic plants that can purify water. The aquatic plants absorb nitrogen and phosphorus in the water to achieve purification. The sewage collection net collects and filters the suspended matter, improving the water environment for plant growth and preventing pollutants from contacting the plants and causing decline and loss of water purification ability.

[0014] Preferably, a rotating assembly is provided on the inner wall of the purification tank near the position where the water body flows in. The rotating assembly includes a rotating shaft fixed to the inner wall of the purification tank. The rotating shaft is rotatably connected with a rotating sleeve. The rotating sleeve is surrounded by rotating blades, and the rotating blades are folding plates. The water body enters the purification tank from the filtration tank and acts on the rotating blades. The rotating blades rotate on the rotating shaft through the rotating sleeve. On the one hand, the impact of water energy is eliminated by the rotating blades, reducing the damage to the plant roots by the water body. On the other hand, large flocculent precipitates can be stirred and dispersed, preventing the flocculent precipitates from blocking the diversion sleeve and affecting the water body circulation. At the same time, when the circulation assembly realizes the water body exchange between different water layers in the tank, the water body falling back above the filter plate drives the rotating blades to slowly rotate relative to the rotating shaft, guiding the flowing water body and improving the water body circulation efficiency between the upper and lower layers. When the rotating blades rotate, the inclined partition plates rotate to form a transverse swirling flow, accelerating the flow rate of the transverse water body, which helps to clean the inner wall of the purification tank where the rotating assembly is not provided through the horizontally flowing water.

[0015] Preferably, a reflector is provided on the plate body of the rotating blade near the rotating sleeve. The reflector includes a laterally inclined reflecting surface. During the rotation of the rotating blade, the reflector drives the reflected light of the sunlight above to form changing reflected light, so that the planted aquatic plants obtain different lighting effects, promoting plant photosynthesis and thus obtaining a better purification effect.

[0016] Since the present invention adopts a circulation assembly with a partition structure to realize water body exchange and filtration, it has the following beneficial effects: The aeration head forms a pressure difference through the circular plates and the diversion sleeves arranged at intervals, realizing the exchange of the upper and lower water layers, and improving the adsorption and purification effect of the rising bubbles on the suspended substances; The conically arranged guide plates improve the guiding effect on the water body, accelerate the flow rate and improve the water body exchange rate, enhancing the purification effect; The guide plates are relatively arranged at intervals and can deform and vibrate to prevent dirt blockage; The dirt collection net realizes the filtration and collection of the dirt guided to the top, purifying the water body; The diffuser guides the water body to wash the filter plate, preventing blockage and affecting filtration; The water delivery pipe inserted in the diffuser can inject clean water downward, and through the cooperation of the diversion sleeve and the circular plate, the water body is sprayed and washed on the inner wall of the purification tank, which helps to clean the tank and reduce the labor cost; The multiple circular plates can slide up and down relative to each other through springs, expanding the cleaning range of the sprayed water body in the tank and further improving the cleaning effect; The water level sensor monitors and controls the water level, enabling the pollutants collected by the top dirt collection net to be separated from the water body in a dry-wet manner, optimizing the water quality while increasing the dissolved oxygen content in the water body and reducing the energy consumption of the aeration head; The rotating blades can eliminate the water body injected from the filtration tank, protect the roots of the planted plants, and disperse large suspended substances, further preventing blockage; When the water body circulates and exchanges, the water body filtered by the filter plate and falling can circulate and flow, accelerating the water body purification rate. Therefore, the present invention is a device for intelligent purification of seawater shrimp and crab aquaculture tail water that can stably purify the water body and is easy to clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic connection diagram of the filtration tank and the purification tank;

[0018] Figure 2 It is a front semi-sectional view of the purification tank;

[0019] Figure 3 It is a schematic diagram of the circulation component;

[0020] Figure 4 It is a schematic diagram of the structure of the diversion sleeve;

[0021] Figure 5 It is a schematic diagram of the structure of the rotating component.

[0022] Reference numerals in the drawings: purification tank 1; filtration tank 2; circulation component 3; circular plate 30; diversion sleeve 31; aeration head 32; circular ring 320; diversion plate 321; fixing rod 33; spring 34; sewage collection net 4; top plate 40; bottom plate 41; filter plate 43; support sleeve 44; diffusion part 45; water delivery pipe 5; cross silicone valve 50; water level sensor 6; planting matrix 7; rotating component 8; rotating shaft 80; rotating sleeve 81; rotating blade 82; partition plate 83; reflector 84. Specific embodiments

[0023] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments and the accompanying drawings:

[0024] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0025] See the attached Figure 1 - The attached Figure 3 , A device for intelligent purification of the tail water of seawater shrimp and crab farming, comprising: a purification tank 1 and a filtration tank 2 connected by a pipeline, the filtration tanks 2 are symmetrically arranged on both sides of the purification tank 1, a circulation component 3 is provided in the center of the purification tank 1, the circulation component 3 includes circular plates 30 arranged at intervals up and down, the center of the circular plate 30 is provided with an opening and a diversion sleeve 31, an aeration head 32 is arranged in the bottom diversion sleeve 31, the aeration head 32 is connected with a pipe body passing through the wall of the purification tank 1 and is connected with an air pump outside. The aeration head 32 aerates the water body to form bubbles, the bubbles rise from the bottom of the water body to the top of the water body and gradually increase, which is beneficial to increasing the oxygen content of the pool water and the oxidation and degradation of organic matter. The rising bubbles are accelerated by a plurality of diversion sleeves 31, and a flow velocity difference and thus a pressure difference are formed between the center and the outside of the circular plate 30, so that the pool water outside the circular plate 30 is continuously sucked into the center of the circular plate 30 from the gap between adjacent circular plates 30, realizing the exchange of the upper and lower water layers and the inner and outer water layers. This not only improves the decomposition effect of bubbles on organic matter in the water, but also avoids the deposition and reaction of dirt at the bottom, polluting the pool water. Through one aeration, the oxygenation and purification of the whole pool of water are realized, saving costs and energy consumption.

[0026] See the appendix Figure 4 , the flow guide sleeve 31 includes a ring 320 fixed to the central hole of the circular plate 30. At the upper end of the ring 320, a plurality of flow guide plates 321 are arranged in a conical shape. The top ends of the flow guide plates 321 are inwardly converging and are located inside the ring 320 above them. The plurality of flow guide plates 321 form a conical sleeve that converges inward and upward. On the one hand, by increasing the passing speed of the bubbles, the pressure difference is increased, further improving the rate of water body exchange. On the other hand, the pollutants suspended in the pool water are diverted to the inside of the circular plate 30. The flow guide plates 321 help to guide the pollutants upward inside. The bubbles generated by the aeration head 32 act on the flow guide plates 321 to make them vibrate relative to the ring 320, which is beneficial to preventing flocculent pollutants from blocking the outside of the flow guide sleeve 31 and preventing water body exchange, and at the same time reducing the possibility of dirt adhering inside the flow guide sleeve 31.

[0027] See the appendix Figure 3 , a sewage collection net 4 is fixed above the circular plate 30 at the top. The sewage collection net 4 includes a top plate 40. Below the top plate 40, a bottom plate 41 that slopes downward and outward is connected. The bottom plate 41 is embedded with a perforated filter plate 43. At the center of the bottom of the top plate 40, a diffuser 44 is provided. The diffuser 44 is conical and the converging end of the cone faces downward. The suspended pollutants in the water body are continuously diverted into the flow guide sleeve 31 and discharged to the lower part of the top plate 40 along with the bubbles to the water surface. After the water body, bubbles and pollutants come into contact with the diffuser 44, they are dispersed outward to the bottom plate 41. The water body enters the pool water through the filter plate 43, and the pollutants remain above the filter plate 43 and are collected by the carrying bottom plate 41, forming the filtration and collection of suspended matter at the top layer, purifying the water quality, and the continuously emerging bubbles will continuously scour the filter plate 43. On the one hand, it is convenient for pollutants to enter the bottom corners of the bottom plate 41 for collection, and on the other hand, it prevents pollutants from blocking the filter plate 43 and affecting the water body exchange and purification in the pool.

[0028] A water delivery pipe 5 is coaxially inserted into the diffuser 44. One end of the water delivery pipe 5 extends out of the conical top of the diffuser 44 and is provided with a cross-shaped silica gel valve 50 that allows water to flow down unidirectionally. The other end of the water delivery pipe 5 is connected to a pump body and a clean water source. After the purification pool 1 completes the water body purification, it is discharged. The clean water source pumps the clean water from the water delivery pipe 5 through the pump body. The water body contacts each flow guide plate 321 downward and is diverted to the gap between adjacent circular plates 30 and flows outwards at a high speed, forming a scour of the upper and lower end faces of the circular plate 30, the flow guide sleeve 31 and the inner wall of the purification pool 1, removing the attached pollutants, which is beneficial to reducing the cost of manual cleaning. The convex direction of the cross-shaped silica gel valve 50 faces downward, and the water body can flow downward from the upper end of the water delivery pipe 5, blocking the upward floating bubbles and water body dirt below, blocking pollutants from entering the water delivery pipe 5 while realizing the discharge and cleaning of the water body.

[0029] See the appendix Figure 2 - Appendix Figure 3, there are multiple fixing rods 33 connected between the bottom and the top circular plates 30. A plurality of circular jacks are arranged around the circular plates 30 located between the top and the bottom. The fixing rods 33 pass through the circular jacks of the circular plates 30 located between the top and the bottom, and this part of the circular plates 30 can slide relative to the fixing rods 33. Springs 34 are sleeved on the fixing rods 33 and are located between adjacent circular plates 30. The springs 34 enable the elastic sliding of the circular plates 30 at the middle position. The water body deflected by the flow guiding plate 321 impacts the circular plates 30, causing the circular plates 30 at the middle to squeeze the springs 34 and slide on the fixing rods 33, thereby changing the height of the water body sprayed out between the circular plates 30, expanding the flushing range of the inner wall of the purification tank 1, and further improving the cleaning effect. At the same time, during the process of the aeration head 32 aerating to circulate and filter the water body, the circular plates 30 can also slide up and down to shake off the dirt attached to their upper and lower end faces, improving the filtering effect on the water body.

[0030] A water level sensor 6 is arranged on the inner wall of the purification tank 1. The position height of the water level sensor 6 is between the top circular plate 30 and the filter plate 43. An electric control valve is provided on the pipeline connecting the purification tank 1 and the filtration tank 2, and the water level sensor 6 is electrically connected to the electric control valve. When the water body discharged from the filtration tank 2 into the purification tank 1 reaches the position of the water level sensor 6, the water level sensor 6 controls the electric control valve to stop injecting water, so that the liquid level is maintained between the top circular plate 30 and the filter plate 43. At this time, the dirt collected between the bottom plate 41 and the top plate 40 is above the water surface. The rising bubbles carry the water body into the bottom plate 41 at the center of the top circular plate 30, and under the action of gravity, the water body passes through the filter plate 43 for filtration and returns to the pool water again, realizing the separation and collection of pollutants at the top from the water body, preventing the pollutants from soaking in the water body for a long time to produce toxic substances and stink. At the same time, the water body after passing through the filter plate 43 can also contact the air during the process of falling back to the pool water, which helps to increase the oxygen content of the water body, reduce the energy consumption of the aeration head 32, and improve the purification efficiency.

[0031] A planting matrix 7 is provided on the inner wall of the purification tank 1. The planting matrix 7 is filled with planting filter materials and planted with aquatic plants capable of purifying water bodies. The aquatic plants absorb nitrogen and phosphorus in the water to achieve secondary purification. The sewage collection net 4 collects and filters suspended substances, improves the water environment for plant growth, reduces the probability of pollutants contacting plants, and prevents the plants from decaying and losing the water purification ability.

[0032] See the appendix Figure 5, a rotating assembly 8 is provided on the inner wall of the purification tank 1 near the position where the water body flows in. The rotating assembly 8 includes a rotating shaft 80 fixed to the inner wall of the purification tank 1. The rotating shaft 80 is rotatably connected with a rotating sleeve 81. The rotating sleeve 81 is circumferentially provided with rotating blades 82, and the rotating blades 82 are folded plates. The water body enters the purification tank 1 from the filtration tank 2 and acts on the rotating blades 82. The rotating blades 82 rotate on the rotating shaft 80 through the rotating sleeve 81. On the one hand, the impact of water energy is eliminated by the rotating rotating blades 82, reducing the damage to the plant roots by the water body. On the other hand, large flocculent precipitates can be stirred and dispersed to prevent the flocculent precipitates from blocking the diversion sleeve 31 and affecting the water body circulation. At the same time, when the circulation assembly 3 realizes the exchange of water bodies in different water layers in the tank, the water body falling back above the filter plate 43 drives the rotating blades 82 to rotate slowly relative to the rotating shaft 80, guiding the flowing water body and improving the circulation efficiency of the upper and lower water layers. When the rotating blades 82 rotate, the inclined partition plates rotate to form a horizontal swirling flow, accelerating the flow rate of the horizontal water body, which helps to clean the inner wall of the purification tank 1 where the rotating assembly 8 is not provided through the horizontally flowing water.

[0033] A reflecting plate 83 is provided on the plate body of the rotating blade 82 near the rotating sleeve 81. The reflecting plate 83 includes a reflecting surface inclined laterally. During the rotation of the rotating blade 82, the reflecting plate 83 is driven to form changing reflected light on the sunlight above, so that the planted aquatic plants obtain different lighting effects, promoting plant photosynthesis and thus obtaining a better purification effect.

[0034] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. Device for intelligent purification of tail water in seawater shrimp and crab farming, comprising: A purification tank (1) and a filtration tank (2) connected by pipes, characterized in that: A circulation component (3) is provided at the center of the purification tank (1), and the circulation component (3) includes circular plates (30) arranged at intervals up and down. The center of the circular plate (30) is provided with an opening and a diversion sleeve (31). An aeration head (32) is arranged in the diversion sleeve (31) at the bottom; The diversion sleeve (31) includes a circular ring (320) fixed to the central hole of the circular plate (30). A plurality of diversion plates (321) are arranged in a conical shape at the upper end of the circular ring (320). The top ends of the diversion plates (321) converge inwards and are located inside the circular ring (320) above them; A plurality of fixing rods (33) are connected between the circular plates (30) at the bottom and the top. The fixing rods (33) pass through the circular plates (30) between the bottom and the top. The fixing rods (33) can slide relative to the circular plates (30). Springs (34) are sleeved on the fixing rods (33) and are located between adjacent circular plates (30).

2. The device for intelligent purification of tail water in seawater shrimp and crab farming according to claim 1, characterized in that: A sewage collection net (4) is fixed above the circular plate (30) at the top. The sewage collection net (4) includes a top plate (40). A bottom plate (41) that slopes downward and outward is connected below the top plate (40). A perforated filter plate (43) is embedded in the bottom plate (41). A diffusion member (44) is provided at the center of the bottom of the top plate (40). The diffusion member (44) is conical and the converging end of the cone faces downward.

3. The device for intelligent purification of tail water in seawater shrimp and crab farming according to claim 2, characterized in that: A water delivery pipe (5) is coaxially inserted into the diffusion member (44). One end of the water delivery pipe (5) extends out of the converging top end of the diffusion member (44) and is provided with a cross-shaped silicone valve (50) that allows water to flow down unidirectionally. The other end of the water delivery pipe (5) is connected to a pump body and a water purification water source.

4. The device for intelligent purification of tail water in seawater shrimp and crab farming according to claim 2, characterized in that: A water level sensor (6) is arranged on the inner wall of the purification tank (1). The position height of the water level sensor (6) is between the circular plate (30) at the top and the filter plate (43). An electric control valve is provided in the pipe connecting the purification tank (1) and the filtration tank (2). The water level sensor (6) is electrically connected to the electric control valve.

5. The device for intelligent purification of tail water in seawater shrimp and crab farming according to claim 1, characterized in that: A planting matrix (7) is provided on the inner wall of the purification tank (1). The planting matrix (7) is filled with planting filter materials and aquatic plants capable of purifying water bodies are planted.

6. The device for intelligent purification of tail water in seawater shrimp and crab farming according to claim 1, characterized in that: The inner wall of the purification tank (1) is provided with a rotating assembly (8) near the position where the water body flows in. The rotating assembly (8) includes a rotating shaft (80) fixed to the inner wall of the purification tank (1). The rotating shaft (80) is rotatably connected with a rotating sleeve (81). The rotating sleeve (81) is circumferentially provided with rotating blades (82), and the rotating blades (82) are folding plates.

7. The device for intelligent purification of the tail water for seawater shrimp and crab farming according to claim 6, characterized in that: a reflecting plate (83) is arranged on the plate body of the rotating blade (82) close to the rotating sleeve (81), and the reflecting plate (83) includes a reflecting surface inclined laterally.

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