Bionic multi-layer stepped temporary rearing device for marine product offspring seeds

By using a biomimetic multi-tiered tiered marine seedling temporary holding device, which utilizes pressure sensors and biomimetic plates to grade seedlings, combined with gear transmission and spiral conveying system, automated feeding and tiered temporary holding are achieved. This solves the problems of low automation and water pollution in existing technologies and improves the survival rate.

CN121795378AInactive Publication Date: 2026-04-07GUANGDONG LUHAI AGRICULTURAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610280603.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-09
Publication Date
2026-04-07
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The current temporary holding process for seafood fry has a low degree of automation, manual feeding is time-consuming and labor-intensive, feed accumulation pollutes the water, fish fry are under great stress, and the survival rate is low.

Method used

Design a biomimetic multi-layered tiered marine seedling temporary holding device. Utilize pressure sensors and biomimetic plates to grade the seedlings, and combine gear transmission and spiral conveying system to achieve automated feeding and tiered temporary holding. A stirring rod and guide wheel ensure uniform feed distribution, and a water spray pipe is used to regulate water flow and control the position of the fish fry.

Benefits of technology

It has enabled automated feeding and stratified temporary rearing of seedlings, reducing stress response, improving water quality, and increasing survival rate.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of offspring seed temporary rearing devices, and discloses a bionic multilayer stepped marine product offspring seed temporary rearing device which comprises a temporary rearing pond, evenly distributed bionic plates are fixedly connected to the bottom of the inner wall of the temporary rearing pond, two supporting plates are fixedly connected to the top of the temporary rearing pond, and a guide rail is fixedly connected between the two supporting plates. A nut pair is slidably connected to the inner wall of the guide rail, a second connecting plate is fixedly connected to the bottom of the nut pair, a displacement sensor is arranged on one side of the second connecting plate, a rack is fixedly connected to one side of the outer wall of the guide rail, a gear is connected to one side of the rack in a meshed mode, and a stirring rod is fixedly connected to one side of the gear. When the feed box moves, a gear is meshed with a rack, a stirring rod is driven to rotate for stirring, and meanwhile a first synchronous belt wheel, a second synchronous belt wheel and a first transmission rod are driven to rotate, and a spiral conveying rod is driven to rotate for conveying feed.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temporary rearing device for seedling, in particular to a bionic multi-layer step type temporary rearing device for seedling of marine products. BACKGROUND

[0002] Seedling of marine products refers to the individual of various marine animals in the stage of juvenile or seedling for mariculture or propagation, which is the basis for developing mariculture industry. High-quality seedling of marine products has the advantages of uniform size, strong constitution, fast growth, strong disease resistance, high survival rate and the like, which can improve the yield and quality of mariculture, increase the economic benefits of breeders, and is also of great significance for protecting marine biodiversity and maintaining ecological balance.

[0003] The existing seedling of marine products needs to be fed and managed when being temporarily reared. Artificial feeding needs to be performed within a specified time every day, and the feeding needs to be performed multiple times every day, which requires artificial management and feeding, has low automation, is time-consuming and laborious, and has high labor cost and management cost. Meanwhile, the feed is prone to be accumulated together, and the dispersed feed is deposited in the inside of the cultivation pool, which not only causes waste but also pollutes the water quality. In addition, the temporarily reared fry has weak constitution and poor adaptability to the temporary rearing environment. The sorting and transferring operations need to be performed during the temporary rearing process, and the fry is greatly stressed due to artificial operation and environmental mutation, which greatly reduces the cultivation effect. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a bionic multi-layer step type temporary rearing device for seedling of marine products, which not only can reduce the stress of the temporarily reared seedling, but also can effectively improve the temporary rearing water quality and improve the survival rate.

[0005] In order to achieve the above object, the present application is realized by the following technical scheme: a kind of bionic multi-layer stepped marine product fry temporary rearing device, including temporary rearing pond, the bottom of the inner wall of temporary rearing pond is fixedly connected with the bionic plate of uniform distribution, the top of temporary rearing pond is fixedly connected with two support plates, two The support plate between fixedly connected with guide rail, the inner wall of guide rail is slidably connected with nut pair, the bottom of nut pair is fixedly connected with second connecting plate, the side of second connecting plate is provided with displacement sensor, the outer wall of guide rail is fixedly connected with rack on one side, the side of rack is meshingly connected with gear, the side of gear is fixedly connected with stirring rod, the outer circle of stirring rod is fixedly connected with first synchronous belt pulley, the bottom of feed tank is fixedly connected with first protective shell, the inner wall of first protective shell is rotatably connected with first transmission rod, the outer circle of first transmission rod is fixedly connected with second synchronous belt pulley, the second synchronous belt pulley and first synchronous belt pulley between being provided with synchronous belt, the outer circle of first transmission rod is fixedly connected with two first driving bevel gears, the outer circle of two first driving bevel gears is meshingly connected with first driven bevel gear on one side, the first driven bevel gear one end of top is penetrated and fixedly connected with spiral conveying rod, the first driven bevel gear one end of bottom is penetrated and fixedly connected with second transmission rod, the outer circle of second transmission rod is fixedly connected with the second driving bevel gear of uniform distribution, the second driving bevel gear outer circle one side is meshingly connected with second driven bevel gear, the second driven bevel gear bottom is penetrated and fixedly connected with scattering wheel, the side of displacement sensor is provided with timer, the outer wall of temporary rearing pond is provided with hierarchical assembly on one side.

[0006] Preferably, the hierarchical assembly includes an L plate fixedly connected between the temporary rearing pond, an electric push rod penetrating and fixedly connected through the inner wall of the L plate on one side, a first connecting plate fixedly connected to the output end of the electric push rod, two baffle plates fixedly connected to the bottom of the first connecting plate, uniformly distributed protrusions penetrating and fixedly connected through the top of the two bionic plates, uniformly distributed pressure sensors provided in the inner wall of the bionic plates, a stepped platform provided on the top of the pressure sensors, and a water spray pipe fixedly connected to the inner wall of the temporary rearing pond on one side.

[0007] Preferably, a second connecting shell penetrating and rotatably connected through the bottom of the stirring rod.

[0008] Preferably, a second connecting shell penetrating and fixedly connected through the bottom of the feed tank, uniformly distributed discharge pipes penetrating and fixedly connected through the bottom of the outer circle of the second connecting shell, a first connecting shell fixedly connected to the bottom of the discharge pipes, a guide wheel rotatably connected to the inner circle of the first connecting shell, and a spiral conveying rod rotatably connected to the inner circle of the second connecting shell.

[0009] Preferably, a second protective shell is fixedly connected to one side of the outer wall of the first connecting shell, and a second driving bevel gear and a second driven bevel gear are provided on the inner wall of the second protective shell.

[0010] Preferably, the inner wall of the temporary holding tank is slidably connected with two first connecting plates.

[0011] Preferably, a gate valve is provided on one side of the temporary holding tank.

[0012] Preferably, a first protective shell is fixedly connected to one side of the outer wall of the guide rail, a servo motor is fixedly connected to one side of the inner wall of the guide rail, a lead screw is fixedly connected to the output end of the servo motor, and a nut pair is threaded onto the outer ring of the lead screw.

[0013] Working principle: During temporary sampling, the seedlings are placed in the upper stepped platform, and an array of pressure sensors below collect data. When the density exceeds the standard, the signal receiver receives and transmits the data to the controller. The controller controls the electric push rod to move the first connecting plate upward. At the same time, the water pump connected to the water spray pipe adjusts the water flow speed according to the actual situation. The water flow impacts the seedlings, and the surface of the bionic board adopts a speed-enhancing bionic texture with fine protrusions. Small seedlings will remain on the upper stepped platform due to the small impact of the water flow and the high surface friction of the bionic board. Medium seedlings will remain on the middle stepped platform due to the impact of the water flow, while large seedlings will slide to the lower stepped platform due to inertia.

[0014] During temporary rearing, feed is placed into the feed hopper, and a timer sets the feeding intervals. When feeding is needed, the signal receiver receives the timer signal and transmits it to the controller. The controller's servo motor then drives the lead screw, causing the pressure sensor to move under the guide rail limit, thereby moving the feed hopper to different locations for feeding. A displacement sensor detects this movement and adjusts the speed as the hopper moves to different stepped positions, allowing for varying feeding times in different areas. The movement of the feed hopper also drives a gear that meshes with a rack and pinion. The mixing rod rotates to mix different types of feed placed inside. When the mixing rod rotates, it drives the first and second synchronous pulleys to run, which in turn drives the first transmission rod to rotate, opening the solenoid valve on the discharge pipe. The feed enters the second connecting shell. The rotation of the first transmission rod drives the screw conveyor rod to rotate, conveying the feed. The rotation of the second transmission rod below drives the guide wheel to rotate, allowing the feed to be discharged evenly. The rotation of the second transmission rod drives the second driving bevel gear and the second driven bevel gear to rotate, which in turn drives the dispersing wheel to rotate, dispersing the discharged feed and achieving automatic feeding to provide a feeding effect.

[0015] This invention provides a biomimetic multi-tiered, stepped marine seedling temporary holding device. It has the following beneficial effects: 1. This invention utilizes gears, a stirring rod, a spiral conveyor rod, a guide wheel, a first transmission rod, and a second transmission rod. During feeding, the controller controls the servo motor to move, driving the nut pair to move, which in turn moves the feed box. A displacement sensor detects this movement. As the feed box moves, the gears mesh with the rack, causing the stirring rod to rotate and stir the feed. Simultaneously, this drives the first synchronous pulley, the second synchronous pulley, and the first transmission rod to rotate, which in turn drives the spiral conveyor rod to rotate. This opens the solenoid valve on the discharge pipe, allowing the material to enter the second connecting shell and be conveyed by the spiral conveyor rod. Furthermore, the first transmission rod drives the second transmission rod to rotate, causing the guide wheel to rotate and evenly distribute the feed. The lower dispersing wheel rotates to break up the feed, thus automating the feeding process and improving feeding efficiency.

[0016] 2. This invention utilizes pressure sensors, a bionic plate, protrusions, and baffles. When seedlings are temporarily held on the right-side stepped platform, the pressure sensors are arranged in an array and collect data. When the density exceeds the limit, the signal receiver transmits the data to the controller. The controller then controls the electric push rod to open the baffle. An external water pump is then connected, and water is discharged from the spray pipe into the temporary holding tank. The water flow impacts the seedlings. Smaller seedlings are held on the upper stepped platform due to the smaller impact of the water flow, the greater friction on the slope of the bionic plate, and the obstruction of the protrusions. Medium-sized seedlings are held in the middle layer, and large seedlings slide to the lower layer due to inertia, facilitating later collection and achieving stratified temporary holding. Attached Figure Description

[0017] Figure 1 This is a top view of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 This is a cross-sectional view of the guide rail structure of the present invention; Figure 4 This is a cross-sectional view of the feed box structure of the present invention; Figure 5 This is a cross-section of the present invention.

[0018] The components include: 1. Temporary holding tank; 2. Stepped platform; 3. Guide rail; 4. Servo motor; 5. Feed box; 6. Gear; 7. Rack; 8. Stirring rod; 9. Discharge pipe; 10. First protective shell; 11. First synchronous pulley; 12. Second synchronous pulley; 13. Synchronous belt; 14. First transmission rod; 15. First driving bevel gear; 16. First driven bevel gear; 17. Second transmission rod; 18. Second protective shell; 19. Second driving bevel gear; 20. ... 21. Driven bevel gear; 22. First connecting shell; 23. Guide wheel; 24. Dispersing wheel; 25. Screw conveyor rod; 26. Second connecting shell; 27. Bionic plate; 28. Displacement sensor; 29. ​​Pressure sensor; 30. Water spray pipe; 31. Electric push rod; 32. Support plate; 33. L-plate; 34. Baffle; 35. First connecting plate; 36. Slide valve; 37. Lead screw; 38. Nut pair; 39. Second connecting plate; 40. Timer. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example: Please see the appendix Figure 1 -Appendix Figure 5 This invention provides a biomimetic multi-tiered stepped marine seedling temporary holding device, including a holding tank 1. A uniformly distributed biomimetic plate 26 is fixedly connected to the bottom of the inner wall of the holding tank 1. Two support plates 31 are fixedly connected to the top of the holding tank 1. A guide rail 3 is fixedly connected between the two support plates 31. A nut pair 38 is slidably connected to the inner wall of the guide rail 3. A stirring rod 8 is rotatably connected to a second connecting shell 25 through its bottom. A feed box 5 is fixedly connected to the second connecting shell 25 through its bottom. A uniformly distributed discharge pipe 9 is fixedly connected to the bottom of the outer ring of the second connecting shell 25. A first connecting shell 21 is fixedly connected to the bottom of the discharge pipe 9. A guide wheel 22 is rotatably connected to the inner ring of a first connecting shell 21, and a screw conveyor rod 24 is rotatably connected to the inner ring of a second connecting shell 25. A second protective shell 18 is fixedly connected to one side of the outer wall of the first connecting shell 21. A second driving bevel gear 19 and a second driven bevel gear 20 are provided on the inner wall of the second protective shell 18. Two first connecting plates 35 are slidably connected to the inner wall of the temporary holding tank 1. A slide valve 36 is provided on one side of the temporary holding tank 1. A first protective shell 10 is fixedly connected to one side of the outer wall of the guide rail 3. A servo motor 4 is fixedly connected to one side of the inner wall of the guide rail 3. A lead screw 37 is fixedly connected to the output end of the servo motor 4. A nut pair 38 is threadedly connected to the outer ring of the lead screw 37.

[0021] The temporary holding tank 1, serving as the main container, is preferably constructed from food-grade 304 stainless steel, which is corrosion-resistant, easy to clean, and suitable for use in seawater environments. The inner wall of the tank is smooth to avoid damaging the seedlings. A gate valve 36 is installed at the bottom of one side of the tank for centralized sewage discharge or bottom runoff after the temporary holding period. The tank 1 is not flat; instead, it features stepped platforms 2. These platforms are arranged in a stepped pattern to simulate different depths in natural water environments. A biomimetic plate 26 covers the surface of the stepped platforms 2. Made of environmentally friendly resin, the biomimetic plate 26 has a surface that is not smooth but molded with subtle undulating textures to simulate the natural roughness of riverbeds or seabeds. In addition, the top of the bionic board 26 is fixedly connected with evenly distributed protrusions 34. The protrusions 34 are hemispherical or frustum-shaped, with a height of 5mm-10mm and a spacing of 15mm-20mm. They are used to provide resistance points when water flows, and to assist in the retention and grading of seedlings with different physical conditions.

[0022] A second connecting plate 39 is fixedly connected to the bottom of the nut assembly 38. A displacement sensor 27 is installed on one side of the second connecting plate 39. A rack 7 is fixedly connected to one side of the outer wall of the guide rail 3. A gear 6 is meshed with one side of the rack 7. A stirring rod 8 is fixedly connected to one side of the gear 6. A first synchronous pulley 11 is fixedly connected to the outer ring of the stirring rod 8. A feed box 5 is fixedly connected to the bottom of the second connecting plate 39. A first protective shell 10 is fixedly connected to the bottom of the feed box 5. A first transmission rod 14 is rotatably connected between the inner walls of the first protective shell 10. A second synchronous pulley 12 is fixedly connected to the outer ring of the first transmission rod 14. A synchronous belt 13 is installed between the second synchronous pulley 12 and the first synchronous pulley 11. Two first master pulleys are fixedly connected to the outer ring of the first transmission rod 14. The moving bevel gear 15 has two first driven bevel gears 16 meshing on one side of their outer rings. A spiral conveying rod 24 is connected through and fixedly connected to one end of the top first driven bevel gear 16. A second transmission rod 17 is connected through and fixedly connected to one end of the bottom first driven bevel gear 16. A uniformly distributed second driven bevel gear 19 is fixedly connected to the outer ring of the second transmission rod 17. A second driven bevel gear 20 is meshing on one side of the outer ring of the second driven bevel gear 19. A dispersing wheel 23 is connected through and fixedly connected to the bottom of the second driven bevel gear 20. A uniformly distributed guide wheel 22 is connected through and fixedly connected to one side of the outer ring of the second transmission rod 17. A timer 40 is set on one side of the displacement sensor 27. A grading component is set on one side of the outer wall of the temporary holding tank 1.

[0023] To prevent feed clumping, a mechanical linkage stirring structure is installed. A rotating shaft is mounted on the side of the second connecting plate 39 via a bearing seat, and a gear 6 is fixed to the end of the rotating shaft. The gear 6 is always engaged with the rack 7 on the side of the guide rail 3. Therefore, when the feed box 5 moves horizontally, the gear 6 is forced to rotate; the gear 6 is coaxially connected to a stirring rod 8, which extends vertically into the feed box 5. The surface of the stirring rod 8 is equipped with spiral blades or a stirring paddle, which uses the passive rotation of the box during movement to mix the feed in real time, eliminating the need for an independent stirring motor, saving energy and creating a compact structure; the first transmission rod 14 meshes with the first driven bevel gear 16 through the first driving bevel gear 15, changing the transmission direction by 90 degrees and driving the horizontally arranged spiral conveying rod 24 to rotate. The spiral conveying rod 24 is located inside the second connecting shell 25 and is responsible for quantitatively pushing the feed to the discharge pipe 9; to ensure uniform feed distribution, a dispersing mechanism is also provided at the bottom. The lower shaft of the first driven bevel gear 16 extends into a second transmission rod 17, which drives the dispersing wheel 23 located at the lowest end of the discharge port to rotate at high speed through a two-stage transmission of the second driving bevel gear 19 and the second driven bevel gear 20. The dispersing wheel 23 uses flexible silicone blades to disperse the falling feed into a mist or fan-shaped surface without breaking the pellet feed, thereby increasing the feeding coverage area.

[0024] The grading component includes an L-plate 32, which is fixedly connected to the temporary holding tank 1. An electric push rod 30 is fixedly connected through one side of the inner wall of the L-plate 32. A first connecting plate 35 is fixedly connected to the output end of the electric push rod 30. Two baffles 33 are fixedly connected to the bottom of the first connecting plate 35. Two bionic plates 26 are fixedly connected to the top of the two baffles 33. Evenly distributed protrusions 34 are fixedly connected to the top of the two baffles 26. Evenly distributed pressure sensors 28 are arranged in an array on the inner wall of the bionic plates 26. A stepped platform 2 is provided on the top of the pressure sensors 28. A water spray pipe 29 is fixedly connected to one side of the inner wall of the temporary holding tank 1.

[0025] An array of pressure sensors 28 (selectable as high-precision resistance strain gauge sensors compatible with the HX711 module) is embedded beneath the biomimetic plate 26. These sensors are evenly distributed across the upper, middle, and lower stepped platforms 2 to monitor the biomass (weight density) of seedlings at each level in real time. Displacement sensors 27 (such as infrared ranging sensors or laser displacement sensors) are installed on the side of the second connecting plate 39. These, along with limit switches at the ends of the guide rails 3, provide real-time feedback on the precise coordinates of the feed box 5, ensuring accurate feeding positions corresponding to each stepped platform. A water spray pipe 29 is located on one side of the inner wall of the rearing pond 1, connected to an external variable frequency water pump. The nozzle angle of the water spray pipe 29 is adjustable, designed to tilt downwards at 15°-30° to generate laminar flow that conforms to the surface of the biomimetic plate 26.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biomimetic multi-tiered stepped marine seedling temporary holding device, comprising a holding tank (1), characterized in that, The bottom of the inner wall of the temporary holding tank (1) is fixedly connected with a uniformly distributed biomimetic plate (26). The top of the temporary holding tank (1) is fixedly connected with two support plates (31). A guide rail (3) is fixedly connected between the two support plates (31). A nut pair (38) is slidably connected to the inner wall of the guide rail (3). A second connecting plate (39) is fixedly connected to the bottom of the nut pair (38). A displacement sensor (27) is provided on one side of the second connecting plate (39). A rack (7) is fixedly connected to one side of the outer wall of the guide rail (3). A gear (6) is meshed with one side of the strip (7), and a stirring rod (8) is fixedly connected to one side of the gear (6). A first synchronous pulley (11) is fixedly connected to the outer ring of the stirring rod (8). A feed box (5) is fixedly connected to the bottom of the second connecting plate (39). A first protective shell (10) is fixedly connected to the bottom of the feed box (5). A first transmission rod (14) is rotatably connected between the inner walls of the first protective shell (10). A second synchronous pulley (12) is fixedly connected to the outer ring of the first transmission rod (14). A synchronous belt (13) is provided between the two synchronous pulleys (12) and the first synchronous pulley (11). Two first active bevel gears (15) are fixedly connected to the outer ring of the first transmission rod (14). One side of the outer ring of the two first active bevel gears (15) is meshed with a first driven bevel gear (16). One end of the first driven bevel gear (16) at the top is connected to a spiral conveyor rod (24). One end of the first driven bevel gear (16) at the bottom is connected to a second transmission rod (17). The outer ring of the second transmission rod (17) is fixedly connected with a uniformly distributed second active bevel gear (19). One side of the outer ring of the second active bevel gear (19) is meshed with a second driven bevel gear (20). The bottom of the second driven bevel gear (20) is connected to a dispersing wheel (23). One side of the outer ring of the second transmission rod (17) is connected to a uniformly distributed guide wheel (22). A timer (40) is provided on one side of the displacement sensor (27). A grading component is provided on one side of the outer wall of the temporary holding tank (1).

2. The biomimetic multi-layered stepped marine seedling temporary holding device according to claim 1, characterized in that, The grading component includes an L-plate (32), which is fixedly connected to the temporary holding tank (1). An electric push rod (30) is fixedly connected through one side of the inner wall of the L-plate (32). A first connecting plate (35) is fixedly connected to the output end of the electric push rod (30). Two baffles (33) are fixedly connected to the bottom of the first connecting plate (35). The tops of the two bionic plates (26) are fixedly connected with evenly distributed protrusions (34). The inner wall of the bionic plates (26) is provided with evenly distributed pressure sensors (28). The top of the pressure sensors (28) is provided with a stepped platform (2). A water spray pipe (29) is fixedly connected to one side of the inner wall of the temporary holding tank (1).

3. The biomimetic multi-layered stepped marine seedling temporary holding device according to claim 1, characterized in that, The bottom of the stirring rod (8) is rotatably connected to a second connecting shell (25).

4. The biomimetic multi-layered stepped marine seedling temporary holding device according to claim 1, characterized in that, The bottom of the feed box (5) is connected to a second connecting shell (25), and the bottom of the outer ring of the second connecting shell (25) is connected to a uniformly distributed discharge pipe (9). The bottom of the discharge pipe (9) is fixedly connected to a first connecting shell (21), and the inner ring of the first connecting shell (21) is rotatably connected to a guide wheel (22). The inner ring of the second connecting shell (25) is rotatably connected to a spiral conveyor rod (24).

5. The biomimetic multi-layered stepped marine seedling temporary holding device according to claim 4, characterized in that, A second protective shell (18) is fixedly connected to one side of the outer wall of the first connecting shell (21), and a second driving bevel gear (19) and a second driven bevel gear (20) are provided on the inner wall of the second protective shell (18).

6. The biomimetic multi-layered stepped marine seedling temporary holding device according to claim 1, characterized in that, The inner wall of the temporary holding tank (1) has two first connecting plates (35) that are slidably connected.

7. The biomimetic multi-tiered stepped marine seedling temporary holding device according to claim 1, characterized in that, A slide valve (36) is installed on one side of the temporary holding tank (1).

8. The biomimetic multi-layered stepped marine seedling temporary holding device according to claim 1, characterized in that, A first protective shell (10) is fixedly connected to one side of the outer wall of the guide rail (3), and a servo motor (4) is fixedly connected to one side of the inner wall of the guide rail (3). A lead screw (37) is fixedly connected to the output end of the servo motor (4), and a nut pair (38) is threadedly connected to the outer ring of the lead screw (37).