Land-based circulating water sea urchin culture equipment

Abstract

The utility model relates to the field of aquaculture equipment, in particular to land-based circulating water sea urchin culture equipment. Comprising a plurality of layers of sea urchin culture water tanks, a water supplementing pipe and a water draining pipe, the number of each layer of sea urchin culture water tanks is two, and every two adjacent layers of sea urchin culture water tanks are connected through supporting legs; the top end of the water replenishing pipe is communicated with the water supply pipe; the bottom end of the drainage pipe is communicated with the sewage pipe; a siphon drainage mechanism is arranged at the bottom of the sea urchin culture water tank; an excrement leakage bottom plate is horizontally arranged in the sea urchin culture water tank; four partition plates are further arranged in the sea urchin culture water tank; the sea urchin culture water tank is evenly divided into four culture areas through the four partition plates. According to the utility model, a modular design concept is adopted, and the whole structure is divided into a plurality of layers. By means of the design, the occupied area of the device is greatly reduced, and the device is particularly suitable for breeding places with limited space.

Description

Technical Field

[0001] This utility model relates to the field of aquaculture equipment, specifically to a land-based recirculating aquaculture system for sea urchin farming. Background Technology

[0002] Sea urchins, as a marine organism with high economic value, have gonads rich in protein, unsaturated fatty acids, and trace elements, making them a core ingredient in the high-end catering market. The global sea urchin market is worth billions of dollars, and demand continues to grow, especially in Asia where supply cannot meet demand. Furthermore, sea urchins play a crucial role in marine ecosystems as "algae regulators," maintaining coral reef health by consuming algae and thus being an important species for balancing marine ecosystems. Therefore, developing sea urchin farming technology has both economic and ecological significance.

[0003] Currently, the mainstream sea urchin farming methods are mainly offshore raft farming and seabed propagation. Offshore raft farming uses floating rafts to suspend farming cages and relies on natural seaweed for feeding, offering advantages such as low cost and large scale. For example, large-scale production has been achieved in Japan and the coastal areas of northern China. However, this type of outdoor farming model has significant drawbacks:

[0004] 1) Uncontrollable environment: Extreme weather (such as storm surge, high temperature, and rainstorm) can easily lead to large-scale death of sea urchins. For example, the Ezo sea urchin is sensitive to water temperature. Water temperature exceeding 25°C will cause spawning or death.

[0005] 2) Difficult water quality management: Open sea areas are susceptible to pollution, salinity fluctuations (such as freshwater runoff), and pathogens (such as shield ciliates), resulting in frequent disease outbreaks and a survival rate of only 20%-40%.

[0006] 3) Long breeding cycle and high cost: Sea urchins take 1.5-2 years to grow naturally. They rely on artificial feeding of seaweed, which leads to high feed costs. They also need to frequently clean up attached organisms (such as barnacles and mussels), which requires a large amount of manpower.

[0007] 4) Ecological pressure: Over-reliance on wild seaweed resources may disrupt the ecological balance of nearshore areas, while raft aquaculture facilities (such as net cages) are prone to causing marine plastic pollution.

[0008] Against this backdrop, land-based recirculating aquaculture technology has emerged as a breakthrough direction. This model effectively mitigates natural environmental risks and shortens the aquaculture cycle by artificially controlling parameters such as water temperature, salinity, and dissolved oxygen (e.g., indoor factory farming can bring the product to market one month earlier). Simultaneously, it improves feed utilization through precise feeding of microalgae or artificial feed. However, existing land-based equipment still suffers from problems such as large land area requirements and high labor costs, necessitating innovative technologies to optimize aquaculture efficiency and sustainability. Utility Model Content

[0009] This utility model provides a land-based recirculating aquaculture system for sea urchin farming, the purpose of which is to solve the technical problems existing in the prior art.

[0010] To achieve the above objectives, the technical solution of this utility model is as follows:

[0011] This utility model provides a land-based recirculating aquaculture system for sea urchin farming, comprising several layers of sea urchin farming tanks, a water supply pipe, and a drainage pipe. Each layer of sea urchin farming tanks consists of two tanks, and adjacent layers are connected by support legs. The top end of the water supply pipe is connected to a water supply pipe, which is used to continuously supply clean seawater to each sea urchin farming tank. The bottom end of the drainage pipe is connected to a sewage pipe, which is used to collect the sewage discharged periodically from each sea urchin farming tank.

[0012] The bottom of the sea urchin aquaculture tank is equipped with a siphon drainage mechanism;

[0013] The sea urchin farming tank is equipped with a horizontally installed manure-straining bottom plate, which has several openings evenly spaced inside. Four partition plates are also installed inside the sea urchin farming tank, each with several openings evenly spaced inside. These four partition plates divide the sea urchin farming tank into four farming areas.

[0014] Furthermore, the upper half of the sea urchin culture tank is a rectangular enclosure, and the lower half is a funnel-shaped bottom.

[0015] Furthermore, at the four corners of the funnel-shaped bottom near the rectangular enclosure, a fixing seat is provided respectively; the bottom of the support leg is provided with a groove, the groove of the support leg can be fastened to the top of the fixing seat and fixed, and the top of the support leg can be inserted into the opening at the bottom of the fixing seat and fixed.

[0016] Furthermore, the inner wall of the sea urchin aquaculture tank is provided with four slots, and one side of each partition plate can be embedded in the corresponding slot, while its bottom edge is connected to the manure-leaking bottom plate by a buckle.

[0017] Furthermore, an overflow pipe is installed in the sea urchin culture tank.

[0018] Furthermore, an air drain valve is also installed at the bottom of the sea urchin aquaculture tank.

[0019] Furthermore, the water supply pipe is vertically arranged, with its top end connected to the water supply pipe and its bottom end sealed; the water supply pipe is equipped with several water supply valves, each corresponding to a sea urchin aquaculture tank.

[0020] Furthermore, the drain pipe is vertically arranged, and its bottom end is connected to the sewage pipe; each sea urchin aquaculture tank has a collection branch pipe at its bottom, the top end of which is connected to the outlet of the siphon drainage mechanism, and the bottom end of which is connected to the manifold pipe, which is connected to the drain pipe.

[0021] Furthermore, the siphon drainage mechanism includes a top cover, a U-shaped pipe, a rubber pad, an outer pipe, and an inner pipe; the top cover has a small hole, the diameter of which is smaller than the inner diameter of the U-shaped pipe; the top cover is disposed on the top of the outer pipe, and the rubber pad is sandwiched between the top cover and the outer pipe, thereby forming a pressure chamber between the rubber pad and the top cover; a connecting pipe is disposed at the top of the inner cavity of the outer pipe, the top end of the inner pipe is embedded in the connecting pipe, and the bottom end of the inner pipe extends to the outside of the outer pipe; one end of the U-shaped pipe is connected to the top cover and communicates with the pressure chamber; the other end is connected to the outer pipe and communicates with the connecting pipe.

[0022] Furthermore, a counterweight is provided at the center of the upper surface of the rubber pad.

[0023] The beneficial effects achieved by this utility model are as follows:

[0024] This invention adopts a modular design concept, dividing the overall structure into several layers. Each layer is equipped with two sea urchin culture tanks, and the layers are stably supported by support legs. This design greatly reduces the footprint of the equipment, making it particularly suitable for aquaculture sites with limited space. At the same time, the modular design brings extremely high maintenance convenience; when a sea urchin culture tank is damaged, only the damaged tank needs to be replaced, effectively reducing subsequent maintenance costs and ensuring the continuity of aquaculture operations.

[0025] In terms of water quality management, this invention achieves 24-hour uninterrupted trickle water replenishment through a water supply pipe. Users can flexibly set valves to precisely control the water flow rate according to the specific needs of sea urchin farming, thereby achieving precise control over the number of water changes based on the requirements of different farming stages. For example, during the sea urchin larval stage, the water change frequency can be appropriately increased to ensure water cleanliness; during the adult stage, the number of water changes can be adjusted according to the actual situation to meet the water quality requirements of sea urchins at different growth stages. In addition, the application of the siphon drainage mechanism realizes automatic drainage function, which can promptly and automatically discharge seawater containing sea urchin feces, not only reducing the labor intensity of manual drainage, but also ensuring that the sea urchin farming tank is always kept clean, creating a good aquatic environment for sea urchin growth.

[0026] The internal structure of the sea urchin farming tanks features four partitions in each tank. These partitions effectively prevent sea urchins from clustering together during the farming process, avoiding uneven feeding that could lead to poor growth in some sea urchins and consequently affecting the quality and yield of the finished product, thus significantly improving the yield rate. Simultaneously, a slatted floor is installed at the bottom of the sea urchin farming tanks. As sea urchins grow on this floor, their excrement falls directly to the bottom through a mesh in the floor. During siphon drainage, the excrement at the bottom is removed along with the excrement, further improving the tank's cleaning efficiency. Even more ingeniously, a gap is left between the slatted floor and the sea urchin farming tanks, which can be used for sea cucumber farming. Sea urchin excrement is rich in nutrients, making it an excellent food source for sea cucumbers. This design enables mixed farming of sea urchins and sea cucumbers, fully utilizing resources within the same farming space, improving farming efficiency, and achieving an ecological circular farming model. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 (Front view); In the figure, the X-axis is defined as the front-to-back direction (vertical), and its arrow points to the front; the Y-axis is defined as the left-to-right direction (horizontal), and its arrow points to the left; the Z-axis is defined as the up-down direction (vertical), and its arrow points to the up.

[0029] Figure 2 This is a three-dimensional representation of the present invention. Figure 2 (Rear view).

[0030] Figure 3 This is a three-dimensional representation of the present invention. Figure 3 (Partial view from an upward angle)

[0031] Figure 4 This is a three-dimensional representation of the present invention. Figure 4 (Partial view from top-down angle)

[0032] Figure 5 This is a three-dimensional representation of the present invention. Figure 5 (Partial view from top-down angle)

[0033] Figure 6 This is a three-dimensional view of the siphon drainage mechanism of this utility model.

[0034] Figure 7This is a cross-sectional view of the siphon drainage mechanism of this utility model.

[0035] In the diagram, 10 is sea urchin farming equipment; 110 is sea urchin farming tank; 111 is a fixed base; 112 is a partition plate; 113 is a manure-suspension bottom plate; 114 is an overflow pipe; 115 is a buckle; 116 is a drain valve; 117 is a slot; 118 is a rectangular enclosure; 119 is a funnel-shaped bottom; 120 is a siphon drainage mechanism; 121 is a top cover; 121A is a small hole; 122 is a U-shaped pipe; 123 is a rubber pad; 123A is a counterweight; 124 is an outer pipe; 124A is a flange platform; 124B is a connecting pipe; 125 is an inner pipe; 126 is a water inlet; 127 is a water outlet; 130 is a water supply pipe; 131 is a water supply valve; 140 is a drain pipe; 141 is a collection branch pipe; 142 is a manifold; 150 is a support leg; 20 is a water supply pipe; and 30 is a sewage pipe. Detailed Implementation

[0036] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] like Figures 1-7As shown, this utility model provides a land-based recirculating aquaculture system for sea urchins 10, comprising several layers of sea urchin aquaculture tanks 110, a water supply pipe 130, and a drain pipe 140. Each layer of sea urchin aquaculture tanks 110 consists of two tanks, and adjacent layers of sea urchin aquaculture tanks 110 are connected by support legs 150. The top end of the water supply pipe 130 is connected to the water supply pipe 20, and the water supply pipe 130 is used to continuously supply clean seawater to each of the sea urchin aquaculture tanks 110. The bottom end of the drain pipe 140 is connected to the sewage pipe 30, and the drain pipe 140 is used to collect the sewage discharged periodically from each of the sea urchin aquaculture tanks 110.

[0040] The upper half of the sea urchin culture tank 110 is a rectangular enclosure 118, and the lower half is a funnel-shaped bottom 119. At the four corners of the funnel-shaped bottom 119 near the rectangular enclosure 118, there are fixing seats 111. The bottom of each support leg 150 has a groove, which can be fastened to the top of the fixing seat 111 for fixation. The top of the support leg 150 can be inserted into the opening at the bottom of the fixing seat 111 of the upper-layer sea urchin culture tank 110 for fixation. Using four such support legs 150, a fixed connection between the upper and lower layers of sea urchin culture tanks 110 can be achieved. This design increases the attachment area for sea urchin culture while reducing the floor space occupied by the culture area, thus increasing the number of culture tanks per unit area.

[0041] The sea urchin farming tank 110 is equipped with a siphon drainage mechanism 120 at its bottom. A slatted floor 113 is horizontally arranged inside the tank, with several evenly spaced openings. Sea urchins grow on the slatted floor 113, and their feces and food residue fall to the bottom through these openings. Since the bottom of the sea urchin farming tank 110 is funnel-shaped (119), the feces and food residue naturally collect at the bottom (i.e., at the inlet 126 of the siphon drainage mechanism 120). During siphon drainage, the siphon drainage mechanism 120 removes the feces and food residue, maintaining the cleanliness of the sea urchin farming tank 110. Furthermore, a gap exists between the slatted floor 113 and the bottom of the sea urchin farming tank 110, which can be used for sea cucumber farming. Sea urchin feces serve as excellent food for sea cucumbers, enabling mixed sea urchin and sea cucumber farming and improving economic efficiency.

[0042] The sea urchin culture tank 110 has four slots 117 on its inner wall. Inside the tank, four partition plates 112 are also provided, each with a number of evenly spaced openings. One side of each partition plate 112 can be inserted into a corresponding slot 117, and its bottom edge is connected to the manure-leaking bottom plate 113 via a buckle 115. Through these four partition plates 112, the sea urchin culture tank 110 is evenly divided into four culture areas. This design effectively prevents sea urchins from clustering together and avoids affecting the yield due to uneven feeding.

[0043] An overflow pipe 114 is installed inside the sea urchin culture tank 110. The bottom end of the overflow pipe 114 is connected to the collection branch pipe 141 described below. The top opening of the overflow pipe 114 is located between the top of the siphon drainage mechanism 120 and the top of the sea urchin culture tank 110. More precisely, the top opening of the overflow pipe 114 is located 10mm below the top of the rectangular wall 118 of the sea urchin culture tank 110. When the siphon drainage mechanism 120 becomes blocked and cannot drain water normally, the water in the tank will flow out from the overflow pipe 114, thereby preventing the tank from overflowing.

[0044] The bottom of the sea urchin culture tank 110 is also equipped with a drain valve 116. When a batch of sea urchins has been cultured and the sea urchin culture tank 110 needs to be cleaned and disinfected, this valve can be opened to drain the water.

[0045] The water supply pipe 20 is fixed to the bottom of the aquaculture farm roof by a bracket, and its height is higher than the uppermost sea urchin aquaculture tank 110. The water supply pipe 20 is connected to a booster pump to deliver clean seawater to the sea urchin aquaculture farm. The sewage pipe 30 is laid under the floor of the aquaculture farm and is connected to the sewage treatment equipment, which is responsible for collecting the sewage discharged from the sea urchin aquaculture farm. The seawater treated by the sewage treatment equipment can be recycled.

[0046] The water supply pipe 130 is vertically arranged, with its top end connected to the water supply pipe 20 and its bottom end sealed. Several water supply valves 131 are provided on the water supply pipe 130, and each water supply valve 131 corresponds to one of the sea urchin culture tanks 110. The water supply valves 131 are used to continuously trickle water into the sea urchin culture tanks 110 24 hours a day. The aquaculture personnel can adjust the water supply flow rate of the water supply valves 131 according to the aquaculture needs, and can achieve timed water changes in conjunction with the siphon drainage mechanism 120.

[0047] The drain pipe 140 is vertically arranged, and its bottom end is connected to the sewage pipe 30. Each sea urchin aquaculture tank 110 has a collection branch pipe 141 at its bottom. The top end of the collection branch pipe 141 is connected to the outlet 127 of the siphon drainage mechanism 120, and the bottom end is connected to the manifold pipe 142, which is connected to the drain pipe 140. Specifically, each layer of the siphon drainage mechanism 120 corresponds to one manifold pipe 142 and two collection branch pipes 141.

[0048] The siphon drainage mechanism 120 includes a top cover 121, a U-shaped pipe 122, a rubber pad 123, an outer pipe 124, and an inner pipe 125. The top cover 121 has a small hole 121A, the diameter of which is smaller than the inner diameter of the U-shaped pipe 122. The top cover 121 is positioned on top of the outer pipe 124, and the rubber pad 123 is sandwiched between the top cover 121 and the outer pipe 124, thereby forming a pressure chamber between the rubber pad 123 and the top cover 121. At the center of the upper surface of the rubber pad 123, a... A counterweight 123A is provided; a connecting tube 124B is provided at the top of the inner cavity of the outer tube 124, the top end of the inner tube 125 is embedded in the connecting tube 124B, and the bottom end of the inner tube 125 extends to the outside of the outer tube 124; under normal conditions, the rubber pad 123 rests on the top end of the connecting tube 124B, and the rubber pad 123 seals the top opening of the connecting tube 124B; the weight of the counterweight 123A is to be determined by experiment, the purpose of which is to enable the rubber pad 123 to better seal the top opening of the connecting tube 124B.

[0049] One end of the U-shaped tube 122 is connected to the top cover 121 and communicates with the pressure chamber; the other end is connected to the outer tube 124 and communicates with the connecting tube 124B; the outer tube 124 is fixed to the bottom of the sea urchin culture tank 110 by a bracket (not shown in the figure), and a gap is provided between the bottom end of the outer tube 124 and the bottom of the sea urchin culture tank 110, which is the inlet 126 of the siphon drainage mechanism 120; the bottom end of the inner tube 125 passes through the sea urchin culture tank 110 and communicates with the collection branch pipe 141, and the bottom end of the inner tube 125 is the outlet 127 of the siphon drainage mechanism 120.

[0050] Furthermore, a flange platform 124A is also provided on the outer pipe 124, which is used to provide a placement position for the manure leakage base plate 113.

[0051] Specifically, the working principle of this utility model is as follows:

[0052] According to actual needs, the staff adjusts the water flow rate of the water supply valve 131; the water level in the sea urchin culture tank 110 gradually rises. When the water level surpasses the small hole 121A, the water level in the pressure chamber is level with the water level in the sea urchin culture tank 110 and rises accordingly. With continuous water replenishment, when the water level in the sea urchin culture tank 110 gradually rises and overflows the top of the U-shaped pipe to reach the drainage level, a siphon phenomenon occurs in the U-shaped pipe. Because the diameter of the small hole 121A is smaller than the inner diameter of the U-shaped pipe, the water outflow velocity in the pressure chamber is greater than the water inflow velocity. Under the negative pressure in the pressure chamber, the rubber pad 123 is sucked up. With the top opening of connecting pipe 124B opened, seawater containing sea urchin excrement at the bottom of the sea urchin culture tank 110 is drawn out along the route of inlet 126 of siphon drainage mechanism 120 – top opening of connecting pipe 124B – outlet 127 of siphon drainage mechanism 120, and finally flows along drain pipe 140 to sewage pipe 30. The water level in the sea urchin culture tank 110 continuously decreases. When the water level reaches the small hole 121A of the top cover 121, the siphon drainage ends, the rubber pad 123 inside the device descends, blocking the top opening of connecting pipe 124B, and the culture tank begins to fill with water. When the water level reaches the drainage level, siphon drainage is performed again, and this cycle continues. Each drainage depth is 40mm.

[0053] Naturally, this utility model can also adopt other structures of siphon drainage mechanism 120.

[0054] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A land-based recirculating aquaculture system for sea urchins (10), characterized in that: The system includes several layers of sea urchin farming tanks (110), a water supply pipe (130), and a drain pipe (140). Each layer of sea urchin farming tanks (110) consists of two tanks, and adjacent layers of sea urchin farming tanks (110) are connected by support legs (150). The top end of the water supply pipe (130) is connected to the water supply pipe (20), and the water supply pipe (130) is used to continuously supply clean seawater to each of the sea urchin farming tanks (110). The bottom end of the drain pipe (140) is connected to the sewage pipe (30), and the drain pipe (140) is used to collect the sewage discharged from each of the sea urchin farming tanks (110). The bottom of the sea urchin culture tank (110) is equipped with a siphon drainage mechanism (120); The sea urchin aquaculture tank (110) is horizontally provided with a manure-leaking bottom plate (113), and the manure-leaking bottom plate (113) has a number of openings evenly spaced on it; inside the sea urchin aquaculture tank (110) there are also four partition plates (112), and the four partition plates (112) have a number of openings evenly spaced on them; through these four partition plates (112), the sea urchin aquaculture tank (110) is evenly divided into four aquaculture areas.

2. The land-based recirculating aquaculture system for sea urchins (10) according to claim 1, characterized in that: The upper half of the sea urchin culture tank (110) is a rectangular enclosure (118), and the lower half is a funnel-shaped bottom (119).

3. The land-based recirculating aquaculture system for sea urchins (10) according to claim 2, characterized in that: At the four corners of the funnel-shaped bottom (119) near the rectangular wall (118), a fixing seat (111) is provided respectively; the bottom of the support leg (150) is provided with a groove, the groove of the support leg (150) can be fastened to the top of the fixing seat (111) and fixed, and the top of the support leg (150) can be inserted into the opening at the bottom of the fixing seat (111) and fixed.

4. The land-based recirculating aquaculture system for sea urchins (10) according to claim 1, characterized in that: The inner wall of the sea urchin aquaculture tank (110) is provided with four slots (117). One side of each partition plate (112) can be embedded in the corresponding slot (117). The bottom edge of the partition plate (112) is connected to the manure-leaking bottom plate (113) by a buckle (115).

5. The land-based recirculating aquaculture system for sea urchins (10) according to claim 1, characterized in that: An overflow pipe (114) is provided in the sea urchin culture tank (110).

6. The land-based recirculating aquaculture system for sea urchins (10) according to claim 1, characterized in that: The bottom of the sea urchin culture tank (110) is also equipped with an air drain valve (116).

7. The land-based recirculating aquaculture system for sea urchins (10) according to claim 1, characterized in that: The water supply pipe (130) is vertically arranged, with its top end connected to the water supply pipe (20) and its bottom end sealed; the water supply pipe (130) is provided with a number of water supply valves (131), and the water supply valves (131) correspond one-to-one with the sea urchin aquaculture tank (110).

8. The land-based recirculating aquaculture system for sea urchins (10) according to claim 1, characterized in that: The drain pipe (140) is vertically arranged, and the bottom end of the drain pipe (140) is connected to the sewage pipe (30); each sea urchin aquaculture tank (110) is provided with a collection branch pipe (141) at the bottom, the top end of the collection branch pipe (141) is connected to the outlet (127) of the siphon drainage mechanism (120), the bottom end of the collection branch pipe (141) is connected to the manifold (142), and the manifold (142) is connected to the drain pipe (140).

9. The land-based recirculating aquaculture system for sea urchins (10) according to claim 1, characterized in that: The siphon drainage mechanism (120) includes a top cover (121), a U-shaped pipe (122), a rubber pad (123), an outer pipe (124), and an inner pipe (125); the top cover (121) is provided with a small hole (121A), the diameter of which is smaller than the inner diameter of the U-shaped pipe (122); the top cover (121) is located on top of the outer pipe (124), and the rubber pad (123) is connected to the outer pipe (124) by the top cover (121) and the inner pipe (125). The outer tube (124) is sandwiched in the middle, thereby forming a pressure cavity between the rubber pad (123) and the top cover (121); a connecting tube (124B) is provided at the top of the inner cavity of the outer tube (124), the top end of the inner tube (125) is embedded in the connecting tube (124B), and the bottom end of the inner tube (125) extends to the outside of the outer tube (124); one end of the U-shaped tube (122) is connected to the pressure cavity, and the other end is connected to the connecting tube (124B).

10. A land-based recirculating aquaculture system for sea urchins according to claim 9, characterized in that: A counterweight (123A) is provided at the center of the upper surface of the rubber pad (123).

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