Controllable environment breeding system suitable for crabs

Abstract

The invention discloses a controllable environment breeding system suitable for crabs, relates to the technical field of crab breeding, and aims at solving the problems that in traditional crab breeding, key environment factors such as water quality and water temperature are difficult to adjust, the space flexibility is low, and maintenance is inconvenient. The system comprises a breeding box body, the breeding box body sequentially comprises a bottom layer box, two middle layer boxes and two top layer boxes from bottom to top, an unfolding mechanism is assembled on the outer wall of the breeding box body, and the unfolding mechanism drives the two middle layer boxes and the two top layer boxes to be unfolded towards the two sides; an inhabiting frame is arranged in the bottom-layer box, and a water quality monitoring sensor is fixedly mounted on one side in the bottom-layer box; a water quality regulation and control mechanism is mounted in one group of middle-layer boxes and comprises a negative pressure pump, a filter, a circulating water temperature controller, an aerator, a controller and a backwashing assembly which are assembled in the middle-layer boxes. The system realizes controllable breeding environment, stable and clean water quality and simple operation and maintenance, and improves the crab breeding effect.

Description

Technical Field

[0001] This invention belongs to the field of crab farming technology, specifically, it relates to a controllable environment farming system suitable for crabs. Background Technology

[0002] Crabs, as a high-quality aquatic product, are experiencing a continuous increase in market demand, driving the ongoing development of aquaculture technology. Currently, crab farming mainly employs mainstream farming models such as earthen ponds, traditional fixed containers, and cement ponds. Among these, earthen pond farming relies on the natural ecological environment, allowing for large-scale farming but offering poor environmental control and susceptibility to external pollution and harm. Traditional fixed container and cement pond farming face numerous unresolved issues in practical applications, including low integration and difficulties in equipment maintenance. Firstly, the flexibility of the breeding space is insufficient: traditional containers are mostly integrated fixed structures, which cannot adjust the spatial form according to the needs of breeding management, resulting in limited operating space during cleaning and maintenance, crab release and harvesting, which increases the difficulty of breeding operations. Secondly, the coordination of water quality control is lacking: the existing aquaculture equipment has many independent functional components such as filtration, temperature control and oxygenation, with low integration, making it difficult to achieve precise and coordinated control of key parameters such as water quality and temperature. Moreover, the filtration components are prone to clogging after long-term use and lack convenient and efficient cleaning structures. Third, the habitat is poorly adapted. The habitat structure in traditional aquaculture facilities is simply designed, mostly a single plane or a simple protrusion, which cannot meet the crab's burrowing and climbing habits, and is not conducive to the crab's growth and development.

[0003] No effective solutions have yet been proposed to address the problems in the relevant technologies.

[0004] Therefore, in order to solve the above problems, the present invention provides a controllable environment aquaculture system suitable for crabs. Summary of the Invention

[0005] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a controllable environment aquaculture system suitable for crabs.

[0006] The objective of this invention can be achieved through the following technical solutions: A controllable environment aquaculture system suitable for crabs includes a culture box, which comprises a bottom box, two middle boxes and two top boxes from bottom to top. The outer wall of the culture box is equipped with an unfolding mechanism that drives the two middle boxes and the two top boxes to unfold to both sides. The bottom box is equipped with a perch, and a water quality monitoring sensor is fixedly installed on one side of the bottom box. One of the middle tanks is equipped with a water quality control mechanism, which includes a negative pressure pump, a filter, a circulating water temperature controller, an aerator, a controller, and a backwashing assembly. One side of the negative pressure pump is connected to a first water intake pipe that extends into the bottom tank. The other side of the negative pressure pump is connected to a tee connector at the top of the filter via a first water supply pipe. The filter is connected to the circulating water temperature controller via a second water supply pipe. The bottom of the circulating water temperature controller is connected to a second drain pipe that extends into the bottom tank. The aerator is connected to the circulating water temperature controller via a first air supply pipe. The bottom of the aerator is also connected to a second air supply pipe that extends into the bottom tank. The backwashing assembly is connected to external clean water and is linked to the filter.

[0007] As a preferred embodiment of the present invention, the perch is a stepped structure with a pyramid-shaped structure embedded inside. A first drain pipe with a solenoid valve is installed at the bottom of one side of the bottom box. A waterproof and breathable valve is installed at the upper middle part of one side of the bottom box. Universal wheels are installed at the four corners of the bottom of the bottom box. An openable protective cover is also fixedly installed inside the bottom box. The water quality monitoring sensor is placed inside the protective cover, and the protective cover has mesh holes for water flow.

[0008] As a preferred embodiment of the present invention, a ventilation window is provided on one side of the middle layer box, and a louver is installed on the ventilation window.

[0009] As a preferred embodiment of the present invention, the top of the top box is rotatably connected to the top cover via a rotating shaft, and the top cover can be flipped open and closed.

[0010] As a preferred embodiment of the present invention, the unfolding mechanism includes a motor base fixedly installed on the outer wall of the bottom box, and a geared motor is fixedly installed on the motor base; The unfolding mechanism also includes two sets of symmetrically distributed rotating rods rotatably connected to the outer wall of the bottom box. Each set of rotating rods is fitted with a gear and a first sprocket. The two sets of gears are meshed together. The output end of the reduction motor is connected to one of the sets of rotating rods. The unfolding mechanism further includes a first connecting rod, a second connecting rod, and a third connecting rod. The two ends of the first connecting rod are connected to the bottom box and the middle box respectively via pins. The two ends of the second connecting rod are connected to the middle box and the top box respectively via pins. The two ends of the third connecting rod are connected to the bottom box and the middle box respectively via pins, and the middle part is connected to the middle box via a pin. A second sprocket is sleeved on the connecting pin between the first connecting rod and the bottom box. The first sprocket and the second sprocket are connected by chain drive.

[0011] As a preferred embodiment of the present invention, the portion of the first water pumping pipe located inside the bottom tank is fitted with a wire sleeve, and a solenoid valve is installed on the first water delivery pipe.

[0012] As a preferred embodiment of the present invention, the filter is provided with coarse filter cotton, fine filter cotton and biological purification layer arranged from top to bottom, and the three-layer structure is superimposed along the filter axis.

[0013] As a preferred embodiment of the present invention, the circulating water temperature controller has a metal inner tank installed inside, a semiconductor cooling chip is installed on one side of the circulating water temperature controller, the cold end of the semiconductor cooling chip is in contact with the metal inner tank, a heat dissipation fin is installed on the hot end side of the chip, and a cooling fan is installed on one side of the heat dissipation fin.

[0014] As a preferred embodiment of the present invention, the backwashing assembly includes a water pump installed inside the middle tank. One side of the water pump is connected to a second water pipe, one end of which is connected to an external water source. The other side of the water pump is connected to the bottom of the filter via a third water supply pipe. The backwashing assembly also includes a third drain pipe connected to a tee connector. The outlet end of the third drain pipe extends to the outside of the middle tank, and a solenoid valve is installed on the third drain pipe.

[0015] As a preferred embodiment of the present invention, waterproof light strips are installed at the bottom of both sets of middle-layer boxes.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, the breeding environment is highly controllable. The water quality regulation mechanism integrates filtration, temperature control, and oxygenation. Combined with water quality monitoring sensors, it ensures stable water quality and temperature, which is suitable for the growth needs of crabs.

[0017] 2. In this invention, the layered unfoldable structure, through the unfolding mechanism, drives the middle and top boxes to unfold to both sides, expanding the operating space, facilitating cleaning, maintenance and crab management, and improving the flexible utilization of space.

[0018] 3. In this invention, the filter is equipped with a backwashing component, which effectively avoids clogging of the filter structure, extends the service life of the equipment, and reduces the frequency of maintenance.

[0019] 4. In this invention, the bottom box is equipped with a special habitat frame and a protective cover, which not only provides a suitable habitat for crabs, but also protects the water quality monitoring sensors, thereby improving the practicality and reliability of the system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the unfolding mechanism of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the water quality control mechanism of the present invention; Figure 5 This is a bottom view of the middle layer box of the present invention; Figure 6 This is a schematic diagram of the planar structure of the filter of the present invention; Figure 7 This is a schematic diagram of the planar structure of the circulating water temperature controller of the present invention.

[0022] Figure label: 1. Breeding box; 2. Bottom box; 201. Perching rack; 202. First drain pipe; 203. Casters; 204. Water quality monitoring sensor; 205. Protective cover; 206. Waterproof and breathable valve; 3. Middle box; 301. Ventilation window; 302. Louver; 4. Top box; 401. Top cover; 5. Deployment mechanism; 501. Motor base; 502. Gear motor; 503. Rotating rod; 504. Gear; 505. First sprocket; 506. First connecting rod; 507. Second connecting rod; 508. Third connecting rod; 509. Second sprocket; 510. Chain; 6. Water quality control mechanism; 601. Negative pressure pump; 60 2. First water intake pipe; 603. Steel wire sleeve; 604. First water delivery pipe; 605. Filter; 6051. Coarse filter cotton; 6052. Fine filter cotton; 6053. Biological purification layer; 606. T-joint; 607. Second water delivery pipe; 608. Circulating water temperature controller; 6081. Metal inner tank; 6082. Semiconductor cooling chip; 6083. Heat dissipation fins; 6084. Cooling fan; 609. Second drain pipe; 610. Aerator; 611. First air delivery pipe; 612. Second air delivery pipe; 613. Controller; 614. Water pump; 615. Second water intake pipe; 616. Third drain pipe; 7. Waterproof light strip. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention: Example: Please refer to Figure 1-7 According to an embodiment of the present invention, a controllable environment aquaculture system for crabs includes an aquaculture box 1. The aquaculture box 1 is assembled from bottom to top with a bottom box 2, two symmetrically distributed middle boxes 3, and two top boxes 4 corresponding to the middle boxes 3. The boxes are connected by an unfolding mechanism 5 to ensure smooth unfolding and retraction without jamming, which not only improves space utilization but also provides convenience for aquaculture management. The two top boxes 4 can hold some commonly used tools or equipment such as aquaculture tools, notebooks, and feed. In order to ensure that the notebooks and feed in the top boxes 4 do not get damp, some desiccant can be placed in the boxes.

[0024] For details, please refer to Figure 3 The bottom box 2 is the core space for crab farming. Inside, a perch 201 is fixedly installed. The perch 201 has a stepped structure with a pyramid-shaped structure embedded within. This composite structure suits the crabs' burrowing and climbing habits, providing a multi-layered and diverse habitat and reducing competition and crowding among crabs. The pyramid-shaped structure can be constructed from materials with a circular or polygonal cross-section (such as hexagons). A first drain pipe 202 is installed at the bottom of one side of the bottom box 2. This drain pipe 202 is equipped with a solenoid valve to control the drainage, facilitating the rapid removal of wastewater and impurities accumulated at the bottom of the box. A waterproof and breathable valve 206 is installed in the upper middle part of one side of the bottom box 2, ensuring air circulation within the box while preventing moisture leakage and maintaining a stable internal environment. Each of the four corners of the bottom box 2 is equipped with a universal caster wheel 203 with brakes, which can easily move and fix the entire aquaculture box 1, adapting to layout adjustments for different indoor and outdoor aquaculture scenarios. An openable protective cover 205 is fixedly installed inside the bottom box 2. The protective cover 205 is connected to the inner wall of the bottom box 2 via hinges. Its surface is evenly perforated with mesh. The water quality monitoring sensor 204 is installed inside the protective cover 205, which not only prevents crabs from touching or scratching the sensor, thus avoiding damage, but also ensures water circulation through the mesh, guaranteeing the accuracy of the water quality monitoring data.

[0025] For details, please refer to Figure 2The unfolding mechanism 5 is used to drive the middle box 3 and the top box 4 to unfold. It includes a motor base 501 fixed to the outer wall of the bottom box 2, on which a geared motor 502 is mounted to provide stable power for the unfolding of the boxes. The unfolding mechanism 5 also includes two sets of symmetrically rotatably connected to the outer wall of the bottom box 2. Each set of rotating rods 503 is equipped with a gear 504 and a first sprocket 505. The two sets of gears 504 mesh with each other to ensure that the two sets of rotating rods 503 rotate synchronously in opposite directions. The output end of the geared motor 502 is fixedly connected to one of the sets of rotating rods 503 to realize direct power transmission. The transmission linkage assembly of the unfolding mechanism 5 includes a first link 506, a second link 507, and a third link 508. The first link 506 is rotatably connected at both ends to the bottom box 2 and the middle box 3 via pins, respectively. The second link 507 is rotatably connected at both ends to the middle box 3 and the top box 4 via pins, respectively. The third link 508 is connected at both ends to the bottom box 2 and the middle box 3 via pins, with its middle section fixed to the middle box 3 via a pin, forming a stable support structure. This effectively improves the structural stability of the box during unfolding and retracting, preventing swaying. A second sprocket 509 is installed on the pin connecting the first link 506 to the bottom box 2. The first sprocket 505 and the second sprocket 509 are connected by a chain 510. This chain drive method provides efficient power transmission with minimal loss, ensuring timely response and good synchronization of the unfolding mechanism.

[0026] For details, please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7One of the intermediate tanks 3 is equipped with a water quality control mechanism 6. The components of the water quality control mechanism 6 are fixed inside the intermediate tank 3, with a compact and reasonable layout. The water quality control mechanism 6 includes a negative pressure pump 601, a filter 605, a circulating water temperature controller 608, an aerator 610, a controller 613, and a backwashing assembly. One side of the negative pressure pump 601 is connected to a first water suction pipe 602, which extends into the bottom tank 2. The portion of the first water suction pipe 602 located inside the bottom tank 2 is covered with a wire sleeve 603. The wire sleeve 603 enhances the water pipe's resistance to compression and damage, preventing crabs from biting or squeezing the water pipe and causing water supply interruption. The other side of the negative pressure pump 601 is connected to a tee connector 606 at the top of the filter 605 via a first water delivery pipe 604. A solenoid valve is installed on the first water delivery pipe 604 for precise control of water flow. The filter 605 has a multi-stage filtration structure consisting of a coarse filter cotton 6051, a fine filter cotton 6052, and a biological purification layer 6053 arranged from top to bottom. This multi-stage filtration structure can intercept large particles and fine suspended particles in the water layer by layer. The biological purification layer can also cultivate beneficial bacteria to further decompose harmful substances in the water, achieving deep purification of the water quality. The filter 605 is connected to the circulating water temperature controller 608 through a second water supply pipe 607. The circulating water temperature controller 608 has a metal inner tank 6081 inside, with a semiconductor cooling chip 6082 installed on one side. The cold end of the semiconductor cooling chip 6082 is tightly fitted to the metal inner tank 6081, and the hot end is equipped with heat dissipation fins 6083. A cooling fan 6084 is mounted on one side of the heat dissipation fins 6083. The heat dissipation fins 6083 increase the heat dissipation area, and the cooling fan 6084 accelerates air circulation. Together, they can quickly dissipate the heat generated by the semiconductor cooling chip 6082, ensuring temperature control efficiency and effectiveness, and keeping the water temperature stable within the range suitable for crab growth. The bottom of the circulating water temperature controller 608 is connected to a second drain pipe 609. The second drain pipe 609 extends into the bottom tank 2 to realize the return of clean water after temperature control. A set of steel wire sleeves is also fitted on the outside of the second drain pipe 609.

[0027] For details, please refer to Figure 4 and Figure 5A ventilation window 301 is provided on one side of the middle tank 3. An adjustable louver 302 is installed on the ventilation window 301. The aerator 610 and the cooling fan 6084 at one end of the circulating water temperature controller 608 are both located near the ventilation window 301, which not only facilitates the aerator 610 to draw in outside air, but also facilitates heat dissipation. One side of the aerator 610 is connected to the circulating water temperature controller 608 through a first air supply pipe 611, which can pre-oxygenate the circulating water. The bottom end extends into the bottom tank 2 through a second air supply pipe 612. The opening of the second air supply pipe 612 is equipped with an air stone, which can disperse oxygen into fine bubbles, increase the contact area between oxygen and water, and improve dissolved oxygen efficiency. The dual oxygenation method ensures that the dissolved oxygen in the water of the bottom tank 2 is sufficient to meet the breathing needs of crabs. A set of wire sleeves is also fitted on the outside of the second air supply pipe 612.

[0028] For details, please refer to Figure 4 and Figure 5 The backwashing assembly includes a water pump 614 installed inside the middle tank 3. One side of the water pump 614 is connected to a second water pipe 615, the other end of which is connected to an external clean water source. The other side of the water pump 614 is connected to the bottom of the filter 605 via a third water supply pipe. A sealing structure is provided at the interface to effectively prevent leakage and ensure the sealing and stability of the backwashing process. A third drain pipe 616 is also connected to a three-way connector 606. The outlet end of the third drain pipe 616 extends outside the middle tank 3, and a solenoid valve is installed on the pipe to control wastewater discharge. The backwashing function can quickly clean blockages inside the filter 605 without disassembling the equipment, making operation convenient, extending the service life of the filter 605, and reducing maintenance workload.

[0029] For details, please refer to Figure 1 and Figure 5 The top layer box 4 is connected to a top cover 401 via a hinge. The top cover 401 can be flipped open and closed, protecting the top layer space from debris falling in and contaminating the breeding environment, while also facilitating the inspection and maintenance of the internal components of the middle layer box 3. Waterproof LED strips 7 are installed at the bottom of both middle layer boxes 3. These strips are electrically connected to a controller 613, allowing for independent brightness adjustment to provide suitable light intensity for crab growth, meeting the light requirements during crab development and contributing to improved crab farming quality.

[0030] The controller 613 is electrically connected to the negative pressure pump 601, the aerator 610, the water pump 614, the semiconductor cooling chip 6082, the cooling fan 6084, the water quality monitoring sensor 204, as well as each solenoid valve and the waterproof light strip 7, to realize the centralized control of the system. The geared motor 502 is started and stopped through the motor control switch, which is installed on the outer wall of the bottom box 2.

[0031] After all components are assembled, it is necessary to ensure that the waterproof and breathable valve 206 can be opened and closed flexibly, the universal wheel 203 has a reliable braking function, the transmission components of the unfolding mechanism 5 work smoothly, the pipeline connections of the water quality control mechanism 6 are sealed without leakage, and the overall system meets the usage requirements for crab farming.

[0032] The working principle of a controlled environment aquaculture system suitable for crabs is as follows: The geared motor 502 of the unfolding mechanism 5 is activated, which drives a set of rotating rods 503 to rotate. Through the meshing transmission of gears 504 on the two sets of rotating rods 503, the other set of rotating rods 503 rotates synchronously in the opposite direction. The first sprocket 505 on the rotating rod 503 drives the second sprocket 509 to rotate through the chain 510, which in turn drives the first connecting rod 506 and the third connecting rod 508 to swing, causing the middle box 3 to unfold to both sides. The middle box 3 pulls the top box 4 to unfold synchronously through the second connecting rod 507. When retracting, the geared motor 502 simply rotates in the opposite direction.

[0033] Water quality monitoring sensor 204 monitors the water quality in bottom tank 2 in real time. Controller 613 starts negative pressure pump 601, which draws water from bottom tank 2 through first water pipe 602 and sends it to filter 605 through first water supply pipe 604. After being filtered through coarse filter cotton 6051, fine filter cotton 6052, and biological purification layer 6053, the water is sent to circulating water temperature controller 608 through second water supply pipe 607. Semiconductor cooling chip 6082, together with heat dissipation fins 6083 and cooling fan 6084, regulates the water temperature in metal inner tank 6081. After temperature control, the water flows back to bottom tank 2 through second drain pipe 609. At the same time, aerator 610 oxygenates the water in circulating water temperature controller 608 through first air supply pipe 611 and also directly oxygenates the water in bottom tank 2 through second air supply pipe 612.

[0034] When filter 605 is clogged, the solenoid valve on the first water supply pipe 604 is closed, the water pump 614 is started, and external clean water is drawn through the second water supply pipe 615 and sent to the bottom of filter 605 through the third water supply pipe for backwashing. The backwash wastewater is discharged from the middle layer box 3 through the tee joint 606 and the third drain pipe 616.

[0035] Wastewater in the bottom box 2 can be discharged through the first drain pipe 202, the casters 203 facilitate the movement of the breeding box 1, the top cover 401 can be flipped open and closed, and the waterproof and breathable valve 206 ensures that the bottom box 2 is breathable and waterproof.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A controlled environment aquaculture system suitable for crabs, comprising an aquaculture tank (1), characterized in that: The breeding box (1) includes a bottom box (2), two middle boxes (3) and two top boxes (4) from bottom to top. The outer wall of the breeding box (1) is equipped with an unfolding mechanism (5), which drives the two middle boxes (3) and the two top boxes (4) to unfold to both sides. The bottom box (2) is equipped with a perch (201) inside, and a water quality monitoring sensor (204) is fixedly installed on one side of the bottom box (2). One of the middle tanks (3) is equipped with a water quality control mechanism (6). The water quality control mechanism (6) includes a negative pressure pump (601), a filter (605), a circulating water temperature controller (608), an aerator (610), a controller (613), and a backwashing assembly, all assembled inside the middle tank (3). One side of the negative pressure pump (601) is connected to a first water pumping pipe (602), which extends into the bottom tank (2). The other side of the negative pressure pump (601) is connected to a tee connector (606) at the top of the filter (605) via a first water supply pipe (604). The filter (605) is connected to the circulating water temperature controller (608) via the second water supply pipe (607). The bottom end of the circulating water temperature controller (608) is connected to the second drain pipe (609), which extends into the interior of the bottom box (2). The aerator (610) is connected to the circulating water temperature controller (608) via the first air supply pipe (611). The bottom end of the aerator (610) is also connected to the second air supply pipe (612), which extends into the interior of the bottom box (2). The backwashing assembly is connected to external clean water and is connected to the filter (605).

2. The controllable environment aquaculture system for crabs according to claim 1, characterized in that: The perch (201) is a stepped structure with a pyramid-shaped structure embedded inside. A first drain pipe (202) with a solenoid valve is installed at the bottom of one side of the bottom box (2). A waterproof and breathable valve (206) is installed in the upper middle part of one side of the bottom box (2). Universal wheels (203) are installed at the four corners of the bottom of the bottom box (2). An openable protective cover (205) is also fixedly installed inside the bottom box (2). The water quality monitoring sensor (204) is placed inside the protective cover (205), and the protective cover (205) has mesh holes for water flow.

3. The controlled environment aquaculture system for crabs according to claim 1, characterized in that: A ventilation window (301) is provided on one side of the middle layer box (3), and a louver (302) is installed on the ventilation window (301).

4. The controllable environment aquaculture system for crabs according to claim 1, characterized in that: The top of the top box (4) is rotatably connected to the top cover (401) via a rotating shaft, and the top cover (401) can be flipped open and closed.

5. A controllable environment aquaculture system suitable for crabs according to claim 1, characterized in that: The unfolding mechanism (5) includes a motor base (501) fixedly installed on the outer wall of the bottom box (2), and a geared motor (502) is fixedly installed on the motor base (501). The unfolding mechanism (5) also includes two sets of symmetrically distributed rotating rods (503) rotatably connected to the outer wall of the bottom box (2). Both sets of rotating rods (503) are fitted with gears (504) and first sprockets (505). The two sets of gears (504) are meshed together. The output end of the reduction motor (502) is connected to one of the sets of rotating rods (503). The unfolding mechanism (5) further includes a first connecting rod (506), a second connecting rod (507) and a third connecting rod (508). The two ends of the first connecting rod (506) are connected to the bottom box (2) and the middle box (3) respectively by pins. The two ends of the second connecting rod (507) are connected to the middle box (3) and the top box (4) respectively by pins. The two ends of the third connecting rod (508) are connected to the bottom box (2) and the middle box (3) respectively by pins, and the middle part is connected to the middle box (3) by pins. A second sprocket (509) is sleeved on the connecting pin between the first connecting rod (506) and the bottom box (2). The first sprocket (505) and the second sprocket (509) are connected by a chain (510).

6. A controllable environment aquaculture system suitable for crabs according to claim 1, characterized in that: The portion of the first water pumping pipe (602) located inside the bottom box (2) is fitted with a wire sleeve (603), and a solenoid valve is installed on the first water delivery pipe (604).

7. A controllable environment aquaculture system suitable for crabs according to claim 1, characterized in that: The filter (605) is arranged from top to bottom with coarse filter cotton (6051), fine filter cotton (6052) and biological purification layer (6053), and the three-layer structure is superimposed along the axial direction of the filter (605).

8. A controllable environment aquaculture system for crabs according to claim 1, characterized in that: The circulating water temperature controller (608) has a metal inner tank (6081) installed inside. A semiconductor cooling chip (6082) is installed on one side of the circulating water temperature controller (608). The cold end of the semiconductor cooling chip (6082) is in contact with the metal inner tank (6081), and a heat dissipation fin (6083) is installed on the hot end side. A cooling fan (6084) is installed on one side of the heat dissipation fin (6083).

9. A controllable environment aquaculture system suitable for crabs according to claim 1, characterized in that: The backwash assembly includes a water pump (614) installed inside the middle tank (3). One side of the water pump (614) is connected to a second water pipe (615). One end of the second water pipe (615) is connected to an external water source. The other side of the water pump (614) is connected to the bottom of the filter (605) through a third water supply pipe. The backwash assembly also includes a third drain pipe (616) connected to a three-way connector (606). The outlet end of the third drain pipe (616) extends to the outside of the middle tank (3), and a solenoid valve is installed on the third drain pipe (616).

10. A controllable environment aquaculture system for crabs according to claim 1, characterized in that: Waterproof light strips (7) are installed at the bottom of both sets of middle-layer boxes (3).

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