A composite membrane-based stackable universal three-dimensional snail farming device

Abstract

This invention discloses a composite membrane-based stackable universal three-dimensional snail aquaculture device, relating to the field of aquaculture technology. It includes at least one aquaculture unit and a filter screen. The aquaculture unit comprises a transparent inverted U-shaped frame and a detachable base plate; the inverted U-shaped frame is connected to the detachable base plate; the interior of the inverted U-shaped frame has a permeable arc-shaped groove, forming through-channel openings at both ends of the aquaculture unit; a transparent nano-TiO2 coating is applied to the outer surface of the inverted U-shaped frame; a modified transparent polyester fiber composite membrane is adhered to the inner surface of the inverted U-shaped frame; the detachable base plate is made of frosted ABS board; the aquaculture units can be spliced ​​together in planar space and stacked vertically; the filter screen is used to seal the through-channel openings of the aquaculture units. This invention has a simple structure, requires no power, and is low-cost, combining three-dimensional aquaculture, water purification, natural feed enrichment, and rapid harvesting functions. It is highly versatile and suitable for efficient and green aquaculture of various snail species in multiple scenarios.

Description

Technical Field

[0001] This invention relates to the field of aquaculture technology, and in particular to a composite membrane-based stackable universal three-dimensional snail farming device. Background Technology

[0002] Snail farming is an important part of aquaculture, and its farming efficiency is highly correlated with the design of the farming equipment. Currently, snail farming technologies in the industry are mainly divided into two categories: traditional extensive farming and existing patented specialized farming technologies. Neither of these technologies takes into account the biological characteristics of snails, the universality of farming scenarios, and ease of operation, which seriously restricts space utilization, farming efficiency, and the development of industrial scale.

[0003] Traditional aquaculture adopts a natural and extensive model in ponds, using bamboo strips as attachment carriers. Without specialized equipment and supporting structures, it suffers from drawbacks such as poor stacking, low space utilization, inconvenient observation, difficulty for snails to attach, high collection difficulty, and uncontrollable aquatic environment.

[0004] Existing publicly available patented aquaculture devices are mostly designed for a single objective, which has obvious limitations: Specialized mechanical equipment: complex structure, high cost, difficult maintenance, only suitable for a single type of screw, with extremely poor versatility; Seedless individual breeding equipment: only suitable for single-animal breeding, cannot be scaled up, and has no three-dimensional stacking design; Symbiotic devices for specific scenarios: They are deeply integrated with rice paddies and mixed farming scenarios, but cannot be adapted to conventional farming, and still use bamboo strips as carriers; Water circulation / high-yield devices rely on mechanical structures and fail to design a feeding environment specifically for snails' licking habits, thus perpetuating the shortcomings of the extensive farming model.

[0005] In summary, the common shortcomings of existing technologies are: insufficient versatility, high cost of mechanical redundancy, neglect of snails' licking habits, and lack of precise control over aquatic algae and organic matter, which cannot meet the needs of green, efficient, and large-scale snail farming. Summary of the Invention

[0006] The main objective of this invention is to provide a composite membrane-based stackable universal three-dimensional snail farming device to solve the above-mentioned problems.

[0007] To achieve the above objectives, this invention provides a composite membrane-based stackable universal three-dimensional snail farming device, comprising at least one farming unit and a filter screen. The farming unit includes a transparent inverted U-shaped frame and a detachable base plate. The top of the inverted U-shaped frame has an mounting plane, and the bottom is connected to the detachable base plate. A transparent arc-shaped groove is formed inside the inverted U-shaped frame, so that the two ends of the farming unit form a through-channel opening. A transparent nano-TiO2 coating is provided on the outer surface of the inverted U-shaped frame. A modified transparent polyester fiber composite membrane is adhered to the inner surface of the inverted U-shaped frame. The modified transparent polyester fiber composite membrane is modified with hydrophilicity and a honeycomb three-dimensional structure, with a surface pore size of 0.5-1mm. The detachable base plate is made of ABS frosted board. The farming units can be spliced ​​together in planar space and stacked in vertical space. The filter screen is used to seal the through-channel openings of the farming units.

[0008] Furthermore, the filter screen is a single sheet structure that covers and wraps all the aquaculture units.

[0009] Furthermore, the filter screen has a mesh structure and is fixed at the through-channel opening of each breeding unit.

[0010] Furthermore, the inverted U-shaped frame is connected to the detachable base plate via a snap-fit ​​structure.

[0011] Furthermore, the bottom of the detachable base plate is provided with a plug rod, and the mounting surface at the top of the inverted U-shaped frame is provided with a slot that matches the plug rod.

[0012] Furthermore, the through-channel openings at both ends of the breeding unit are respectively provided with matching bosses and grooves, and two adjacent breeding units are spliced ​​longitudinally in planar form by inserting the bosses and grooves; the detachable base plate of the breeding unit is connected to its adjacent breeding unit in planar lateral form by mortise and tenon structure, magnetic structure or hinge structure on both sides.

[0013] Furthermore, the inverted U-shaped frame is made of acrylic, PVC, or FRP.

[0014] Furthermore, the thickness of the nano-TiO2 coating is 0.1-0.3 mm.

[0015] Furthermore, the modified transparent polyester fiber composite film can be replaced with a modified PVC composite film or a modified PP composite film.

[0016] Furthermore, the nano-TiO2 coating can be replaced with a nano-ZnO coating or a nano-Ag antibacterial coating.

[0017] The present invention has the following beneficial effects: 1. Core functional layer design of composite membrane base: For the first time, a polyester fiber composite membrane modified with hydrophilic and honeycomb three-dimensional structure is used as the core functional layer of snail farming device. It is specifically adapted to the licking feeding mode of snails, and at the same time, it can enrich algae and beneficial bacteria, which solves the core defects of existing technology that ignore the biological characteristics of snails and do not pay attention to the creation of natural food environment.

[0018] 2. Multi-material synergistic water environment regulation system: Combining the organic matter decomposition function of nano-TiO2 coating with the food enrichment function of modified polyester fiber composite membrane, a closed loop of water environment regulation of decomposition, enrichment and utilization is formed, which not only avoids the accumulation and decay of organic matter, but also provides a natural food source for snails, solving the problem of poor water environment control in existing technologies.

[0019] 3. Stackable universal frame structure design: The design adopts a combination of a snap-fit ​​stackable frame, a through-type channel, and a detachable base plate to realize the three-dimensional utilization of breeding space, flexible adaptation to multiple scenarios, and convenient breeding operations, solving the defects of existing technologies such as poor universality, low space utilization, and difficulty in collection and cleaning.

[0020] 4. Simple and low-cost design without complex machinery: It abandons the complex power machinery components such as motors, tracks, and electric push rods in existing patented devices, and adopts conventional materials and simple splicing and bonding processes to achieve low cost, easy manufacturing and easy maintenance of the device. The cost of a single half-meter long device is less than 30 yuan, which solves the problems of high cost and difficult maintenance of existing patented devices and is suitable for the use needs of ordinary breeding operators. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall breeding unit of a composite membrane-based stackable universal three-dimensional snail breeding device according to the present invention.

[0022] Figure 2 This is a schematic diagram of the stacking of breeding units in a composite membrane-based stackable universal three-dimensional snail breeding device according to the present invention.

[0023] Figure 3 This is a partial schematic diagram of the breeding unit of a composite membrane-based stackable universal three-dimensional snail breeding device according to the present invention.

[0024] Among them, 1-removable base plate; 2-modified transparent polyester fiber composite film; 3-inverted U-shaped frame; 4-nano TiO2 coating. Detailed Implementation

[0025] To achieve the above objectives and effects, the technical means and structure adopted by the present invention will be described in detail with reference to the accompanying drawings, focusing on the features and functions of the preferred embodiments of the present invention.

[0026] like Figure 1-3As shown, the present invention provides a composite membrane-based stackable universal three-dimensional snail farming device, including at least one farming unit and a filter screen.

[0027] The aquaculture unit includes a transparent inverted U-shaped frame 3 and a detachable base plate 1. The top of the inverted U-shaped frame 3 has an installation plane, and the bottom is connected to the detachable base plate 1 through a snap-fit ​​structure. The inside of the inverted U-shaped frame 3 has a transparent arc-shaped groove, which forms a through channel at both ends of the aquaculture unit, ensuring the natural entry and exit of aquaculture water in the device, so that the water in the device and the external aquaculture water form a circulation, avoiding static stagnation of the water. A transparent nano-TiO2 coating 4 is provided on the outer surface of the inverted U-shaped frame 3. A modified transparent polyester fiber composite film 2 is pasted on the inner surface of the inverted U-shaped frame 3. Aquaculture units can be spliced ​​together in plane and stacked in vertical space. The bottom of the detachable base plate 1 is provided with a plug rod, and the installation plane at the top of the inverted U-shaped frame 3 is provided with a slot that matches the plug rod. The two ends of the aquaculture unit have matching protrusions and grooves at their through-passage openings. Adjacent aquaculture units are joined longitudinally via the protrusions and grooves. The detachable base plate 1 of the aquaculture unit is connected laterally to adjacent aquaculture units via mortise and tenon joints, magnetic attachment, or hinges. This standardized assembly structure allows for flexible combination according to aquaculture needs, adapting to both small-scale stacking of laboratory aquaculture boxes and large-scale stacking in ponds and rivers. It effectively solves the problems of poor stacking properties of traditional bamboo strips and the lack of three-dimensional stacking design in existing patented devices, enabling multi-layered three-dimensional utilization of aquaculture space and significantly increasing the snail aquaculture density per unit water volume. The transparent material allows for direct observation of snail growth.

[0028] The inverted U-shaped frame 3 is made of acrylic material, which features high transparency, high strength, high density, and low cost. ① High transparency allows aquaculture personnel to directly observe the feeding, growth, and survival status of snails inside the device, solving the problem of traditional bamboo strips obstructing the view; ② High strength ensures that the device can be stacked in multiple layers without deformation, making it suitable for large-scale aquaculture; ③ High density allows the device to sink naturally in the water without additional counterweights, meeting the submersion requirements of open aquaculture scenarios such as ponds and rivers, while avoiding the impact of floating structures on snail habitats; ④ Low cost significantly reduces the production cost of the device. The inverted U-shaped frame 3 can also be made of rigid PVC or fiberglass (FRP). Rigid PVC is even cheaper, further reducing the production cost of the device and making it suitable for large-scale commercial aquaculture; fiberglass has higher structural strength, allowing for higher stacking levels, making it suitable for large water bodies and high-density aquaculture scenarios.

[0029] The detachable base plate 1 is made of ABS frosted board; ABS frosted board has the characteristics of high strength, corrosion resistance and high surface friction. ① The high strength and corrosion resistance ensure that it will not deform or rot when placed in water for a long time, which is suitable for the use needs of the aquaculture environment; ② The frosted texture on the surface provides greater friction, which can provide snails with additional attachment and habitat sites; ③ The frosted surface can effectively collect snail feces, prevent feces from being suspended in the water, and keep the water clean.

[0030] The modified transparent polyester fiber composite membrane 2 undergoes hydrophilic modification and honeycomb three-dimensional structure modification, a conventional physical modification process. After modification, the hydrophilicity of the composite membrane is enhanced, and a honeycomb three-dimensional microporous structure with a pore size of 0.5-1mm is formed on the surface. As the core of the composite membrane base of this invention, it specifically addresses the core deficiency of existing technologies that ignore the licking feeding method of snails. ① The hydrophilic and honeycomb three-dimensional structure modification design facilitates the accumulation of nutrients and microorganisms in the water on the membrane surface, promotes the reproduction and growth of algae and beneficial bacteria, creates a natural food bed for snails, and matches the licking feeding method of snails, eliminating the need for frequent additional feeding and reducing breeding costs; ② The honeycomb three-dimensional surface has good roughness, which is suitable for the attachment and habitat habits of snails, solving the problem of poor snail attachment due to the smooth surface of traditional bamboo strips, and improving the habitat stability of snails; ③ The transparent material does not affect the observation effect, and at the same time has good corrosion resistance and toughness, and can be used in water for a long time. The modified transparent polyester fiber composite membrane 2 can be replaced by a modified transparent polyvinyl chloride (PVC) composite membrane or a modified transparent polypropylene (PP) composite membrane. Both alternative materials need to undergo the same hydrophilicity and honeycomb three-dimensional structure modification treatment to achieve the same feed enrichment and snail attachment functions as the original composite membrane. Among them, the modified PVC composite membrane has stronger corrosion resistance and is suitable for brackish water mixed aquaculture scenarios (such as the aquaculture of Oriental whelk), while the modified PP composite membrane has better lightweight properties and is suitable for shallow water aquaculture scenarios.

[0031] The thickness of the nano-TiO2 coating 4 is 0.1-0.3mm. It employs a conventional waterproof coating process and can be air-dried after application, making it resistant to water erosion. Under light conditions, the nano-TiO2 coating 4 exhibits strong oxidizing properties, ① efficiently decomposing humus, snail excrement, and excess organic matter in the water within the device, preventing the accumulation of organic matter and the formation of anaerobic zones, thus addressing the issue of insufficient control of organic matter in water in existing technologies; ② the decomposed organic matter can be converted into micronutrients for algae and bacterial growth, synergizing with the subsequent modified composite membrane's feed enrichment function to achieve a balance between the "decomposition-utilization" of organic matter in the water; ③ the nano-TiO2 coating 4 possesses certain antibacterial properties, inhibiting the reproduction of harmful pathogens in the water and reducing the incidence of snail diseases. The nano-TiO2 coating 4 can also be replaced by a nano-ZnO (zinc oxide) coating or a nano-Ag (silver) antibacterial coating. The nano-ZnO coating also has strong oxidizing properties under light conditions, and can achieve the same organic matter decomposition function as the nano-TiO2 coating, and has a wider antibacterial range. The nano-Ag antibacterial coating has stronger antibacterial properties and can focus on inhibiting harmful pathogens in the water, making it suitable for aquaculture scenarios with high incidence of diseases.

[0032] Filter screens are used to seal the through-passage openings of aquaculture units; filter screens come in two forms: The entire filter screen covers and wraps all aquaculture units, providing a completely enclosed design and quick installation. Mesh structure: Each mesh bag is individually fixed at the entrance of each breeding unit, enabling independent closure of each unit. It is suitable for family selection and classified breeding.

[0033] Example 1: Application of Brackish Water Aquaculture of the Spotted Snail

[0034] I. Specifications and Static Structure of the Device in the Example

[0035] Aquaculture unit specifications: 50cm (length) × 20cm (width) × 15cm (height). The inverted U-shaped frame 3 is made of acrylic material, with a 0.2mm thick nano-TiO2 coating 4 on the outer surface, and a modified transparent polyester fiber composite film 2 (0.8mm pore size) on the inner surface. The detachable base plate 1 is made of 1.5mm thick frosted ABS board, connected to the inverted U-shaped frame 3 via a snap-fit ​​structure. An air stone is fixed at one end of the channel and connected to the circulating water pipe, while a mesh bag is fixed at the other end, forming a closed aquaculture chamber. The total cost of a single aquaculture unit is 28 yuan, and it can be used repeatedly for more than 12 months, with an annual maintenance cost of less than 1 yuan.

[0036] Adaptation to breeding scenarios

[0037] Four aquaculture units were stacked in a 60cm×30cm×60cm factory-style recirculating aquaculture tank. The water temperature was controlled at 26-28℃, and the initial water quality indicators were: ammonia nitrogen <0.01mg / L, nitrite nitrogen <0.04mg / L, and dissolved oxygen >6.5mg / L.

[0038] Snail release and aquaculture management

[0039] 1. Snail release: Juvenile Oriental Wind Snails with an initial weight of 2.97±0.26g are released into each device at a density of 42 snails / L, with 630 snails released into a single breeding unit. After contact with the modified transparent polyester fiber composite film 2, the snails quickly attach to the honeycomb three-dimensional structure surface without escaping or accumulating, and the attachment stability reaches over 98%.

[0040] 2. Daily management: No additional artificial feed is required. The circulating water and aeration are kept running continuously (dissolved oxygen is kept stable at 5.5-6.8 mg / L). The laboratory is exposed to natural light for 8 hours a day. One-third of the water is changed every 3 days during the breeding cycle, and the water saving rate reaches 60%.

[0041] 3. Dynamic Functional Linkage: Under natural light, the nano-TiO2 coating 4 generates strong oxidizing properties, decomposing organic matter such as snail feces and humus, achieving a COD removal rate of 84.3%±3.5%, an ammonia nitrogen removal rate of 91.5%±3.8%, and a nitrite nitrogen removal rate of 97.7%±0.1%; the decomposed micronutrients promote the reproduction of algae and beneficial bacteria.

[0042] Aquaculture harvesting (dynamic operation with detachable base plate)

[0043] Harvesting is carried out after 60 days of cultivation. The operating steps are as follows: 1. Remove the breeding units one by one from the breeding box, and disassemble the air stones and net bags; 2. Gently pry open the elastic buckles of the ABS frosted plate and pull out the detachable base plate without tools (takes about 45 seconds). 3. Inside the device, the spotted snails fall into the collection basin in a concentrated manner, with no residue or damage, achieving a harvesting efficiency of 100%. 4. Compared with traditional frozen bait farming: No need for manual turning of the carrier or retrieval in the water. The harvesting time of a single device is reduced from 10 minutes to 1 minute, and the labor intensity is reduced by 65%.

[0044] Step 5: Equipment cleaning and recycling

[0045] The device and its components can be rinsed with fresh water to remove residual algae and feces from the surface of the modified transparent polyester fiber composite membrane 2 without any adhesion. After rinsing, it can be reassembled and put back into aquaculture. There are no easily damaged parts, and it can be reused ≥12 times.

[0046] III. Implementation Results and Technical Advantages

[0047] After 60 days of cultivation, testing showed that the cultivation of the spotted whelk was significantly better than traditional cultivation methods and existing mechanical equipment. 1. Growth and survival performance: The final body weight reached 4.21±0.13g, the weight gain rate was 39.7%, and the specific growth rate was 0.81% / d, which was significantly higher than that of the traditional breeding control group (weight gain rate 28.09%). The survival rate reached 96.8%±1.2%, which was 7.28 percentage points higher than that of traditional frozen feed breeding (89.52%). The disease incidence rate was only 2.1%, which was far lower than that of traditional breeding at 12%.

[0048] 2. Digestive and immune functions: Intestinal amylase activity reached 6.9±0.2U / mg prot, and lipase activity reached 7.5±0.4U / g prot, which were significantly higher than those in the conventional breeding group (amylase 3.1±0.2U / mg prot, lipase 2.4±0.5U / g prot); glutathione peroxidase activity in the liver and pancreas increased by 42%, and lysozyme activity increased by 35%, effectively inhibiting the reproduction of pathogenic bacteria such as Vibrio.

[0049] 3. Space and cost-effectiveness: After stacking 4 layers, the stocking density per unit water volume reaches 42 birds / L, which is 325% higher than traditional pond culture (8-10 birds / L); the cost of a single unit is 28 yuan, which is only 2.8% of the existing mechanical equipment, and no artificial feed is required, reducing feed costs by 100% in a 60-day culture cycle.

[0050] 4. Product quality: The muscle tissue ratio is 33.9%±0.6%, which is higher than the 27.26% of traditional farming; the DHA content in the muscle is 20.6%±0.1% and the ARA content is 19.1%±0.2%, which is not significantly different from the traditional frozen feed farming group, ensuring the flavor and nutritional quality of the product.

[0051] Example 2: Application of freshwater pond culture of pear-shaped snails

[0052] I. Specifications and Static Structure of the Device in the Example

[0053] The core specifications of the device are: length 50cm × width 20cm × height 15cm. The inverted U-shaped frame 3 is made of acrylic material with a 0.2mm thick nano-ZnO coating on the outer surface and a modified transparent polyester fiber composite film 2 (pore size 0.5-1mm) on the inside. The detachable base plate 1 is a 2mm thick frosted ABS board, which is connected to the inverted U-shaped frame 3 by a snap-fit ​​structure. The total cost of a single breeding unit is 25 yuan, and it can be reused ≥12 times.

[0054] II. Dynamic Usage Process (Pond Ecological Aquaculture Scenario)

[0055] Adaptation to breeding scenarios

[0056] The aquaculture units are laid flat and stacked in the shallow water area of ​​the pond, with 4 layers stacked (water depth 50-80cm), without the need for additional weight (due to the high density of acrylic material); then covered and wrapped with a whole filter screen to prevent escape; water circulation is achieved by utilizing natural water flow, with dissolved oxygen content of 5.0-6.5mg / L and initial water quality indicators: organic matter content <1mg / L, pH 7.5-8.5.

[0057] Snail release and aquaculture management (core dynamic aquaculture process)

[0058] 1. Snail release: juvenile pear-shaped snails with an initial weight of 0.5g are released into each breeding unit at a density of 30 snails / L, with 450 snails released into a single breeding unit. The snails quickly attach to the modified transparent polyester fiber composite film after contact, with an attachment stability improved by 60%, avoiding habitat stress caused by the smooth surface of traditional bamboo strips.

[0059] 2. Daily management: No additional artificial feed is required. It relies on the device's natural feed system for feeding. Pond culture can rely on natural light and does not require additional lighting. During the culture cycle, there is no need for frequent water changes. Water quality is maintained by natural water self-purification and device regulation.

[0060] 3. Dynamic Functional Linkage: Under natural light, the nano-ZnO coating decomposes snail feces and water humus. Combined with the hydrophilicity and honeycomb structure of the modified transparent polyester fiber composite membrane 2, it promotes the reproduction of beneficial algae and bacteria, keeping the organic matter content in the water stable below 0.5mg / L; the COD removal rate reaches more than 85%, effectively avoiding the dilemma of "water that is too clear will not have snails, and water that is too fertile will rot".

[0061] Aquaculture harvesting (dynamic operation with detachable base plate)

[0062] Harvesting is carried out after 45 days of cultivation. The operating steps are as follows: 1. Remove each breeding unit from the breeding box as a whole; 2. Gently pry open the elastic buckles of the ABS frosted plate and pull out the detachable base plate without tools (takes about 45 seconds). 3. The snails fall into the collection net in a concentrated manner, with no residue or damage, achieving a 100% harvest efficiency; 4. Compared with traditional bamboo strip farming: There is no need for manual turning of bamboo strips or going into the water to collect them. The harvesting time of a single device is reduced from 10 minutes to 1 minute, and the harvesting time of a single acre of pond is reduced from 8 hours to 1.5 hours, reducing labor costs by 65%.

[0063] The cleaning and recycling of the device are the same as in Example 1.

[0064] III. Implementation Results and Technical Advantages

[0065] After 45 days of cultivation, tests showed that the pear-shaped snails were significantly more effective in cultivation than those cultivated using traditional bamboo strips. 1. Growth and survival performance: The final average weight reached 2.8g, with a weight gain rate of 460%, which is significantly higher than the 300% of traditional farming; the survival rate reached 95.3%±1.8%, which is 32.4% higher than traditional farming (72%). There was no mass mortality due to hypoxia. The growth cycle was shortened from the traditional 6-8 months to 4.5-5 months, and the slaughter efficiency was increased by more than 30%.

[0066] 2. Space utilization: The stocking density reaches 30 birds / L, which is 400% higher than the traditional pond bamboo strip culture (5-6 birds / L).

[0067] 3. Cost and operational advantages: The cost of a single breeding unit is 25 yuan (for large-scale procurement), which is far lower than the existing specialized equipment; no artificial feed is required, reducing feed costs by 100%; the cleaning time for a single breeding unit is ≤2 minutes, significantly reducing the intensity of manual labor.

[0068] 4. Ecological adaptability: The device can be directly submerged in freshwater environments such as ponds, rivers, and paddy fields without the need for additional counterweights or complex supporting equipment. The dissolved oxygen content in the water is stable at 5.0-6.5 mg / L, and the concentration of aquaculture wastewater discharge is: COD≤35 mg / L, ammonia nitrogen≤0.07 mg / L, and total phosphorus≤0.3 mg / L, which are far below the pollutant discharge limits for freshwater aquaculture and conform to the green and low-carbon aquaculture guidelines.

[0069] The above description is only a preferred embodiment of the present invention and not all embodiments. Anyone should know that structural changes made under the guidance of the present invention, and any technical solutions that are the same as or similar to the present invention, are within the protection scope of the present invention.

Claims

1. A composite membrane-based stackable universal three-dimensional snail farming device, characterized in that, The system includes at least one aquaculture unit and a filter screen. The aquaculture unit comprises a transparent inverted U-shaped frame and a detachable base plate. The top of the inverted U-shaped frame has a mounting plane, and the bottom is connected to the detachable base plate. A transparent arc-shaped groove is formed inside the inverted U-shaped frame, creating a through-channel at both ends of the aquaculture unit. A transparent nano-TiO2 coating is applied to the outer surface of the inverted U-shaped frame. A modified transparent polyester fiber composite membrane is adhered to the inner surface of the inverted U-shaped frame. The modified transparent polyester fiber composite membrane is modified for hydrophilicity and a honeycomb three-dimensional structure, with a surface pore size of 0.5-1 mm. The detachable base plate is made of frosted ABS board. The aquaculture units can be spliced ​​together in planar space and stacked vertically. The filter screen is used to seal the through-channel at the aquaculture unit.

2. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The filter screen is a single sheet that covers and wraps all the aquaculture units.

3. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The filter screen is a mesh bag structure, fixed at the through-channel opening of each breeding unit.

4. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The inverted U-shaped frame is connected to the detachable base plate via a snap-fit ​​structure.

5. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The bottom of the detachable base plate is provided with a plug rod, and the mounting surface at the top of the inverted U-shaped frame is provided with a slot that matches the plug rod.

6. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The two ends of the breeding unit are provided with matching bosses and grooves at the through-channel openings. The two adjacent breeding units are spliced ​​longitudinally in planar form by inserting the bosses and grooves. The two sides of the detachable bottom plate of the breeding unit are connected to the adjacent breeding units in planar lateral form by mortise and tenon structure, magnetic structure or hinge structure.

7. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The inverted U-shaped frame is made of acrylic, PVC or FRP.

8. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The thickness of the nano-TiO2 coating is 0.1-0.3 mm.

9. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The modified transparent polyester fiber composite film can be replaced with a modified PVC composite film or a modified PP composite film.

10. The composite membrane-based stackable universal three-dimensional snail farming device as described in claim 1, characterized in that, The nano-TiO2 coating can be replaced with a nano-ZnO coating or a nano-Ag antibacterial coating.

Images