Cultivation device and cultivation method for sea grass

Abstract

The invention discloses a cultivation device and method for sea grass, and belongs to the technical field of sea grass planting.The cultivation device for the sea grass comprises a nursery pond, a grid support is arranged in the nursery pond, and a gap exists between the grid support and the bottom wall of the nursery pond; through cooperation of structures such as a material pushing plate, a rotating rod, a convex surface section, a concave-convex section and a concave surface section, when the convex surface section of the rotating rod faces downwards, the material pushing plate moves in a reciprocating mode to evenly spread a bottom layer culture medium, and when the concave-convex section faces downwards, a sliding block moves along the concave-convex section in an attached mode under the pulling force of a spring at the top of the material pushing plate, so that the material pushing plate slightly vibrates; and when the concave surface section faces downwards, the material pushing plate moves upwards by a small section under the pulling force of the spring to make enough thickness for the upper-layer culture medium, and then the culture medium is pushed back and forth again, so that the culture medium is uniformly laid on the surfaces of the sea grass seeds, and the survival rate is increased.

Description

Technical Field

[0001] This invention belongs to the field of seaweed cultivation technology, specifically a cultivation device and cultivation method for seaweed. Background Technology

[0002] Seagrass is a type of submerged angiosperm distributed along the nearshore waters or estuaries of oceans beyond the polar regions. Large, continuous plant communities composed of single or multiple species of seagrass are called seagrass beds, which provide important habitats, breeding grounds, and shelters for numerous fishery species and are one of the three major typical marine ecosystems on Earth.

[0003] For a long time, the vital role of seagrass in the ocean has not received sufficient attention. Seagrass beds have declined globally, and many areas are on the verge of extinction, threatening the survival of other marine life. Seagrass bed restoration is now imperative. Currently, seagrass bed restoration mainly relies on seagrass transplantation, and artificially cultivating seedlings from seeds is one of the important ways to obtain seagrass.

[0004] To address this, Chinese Patent Application No. 202110333149.1 discloses a seagrass cultivation system based on a land-based greenhouse. The system is constructed around a natural sea area and includes a greenhouse, cultivation ponds, a water supply system, and a drainage system. The cultivation ponds are brick-concrete structures oriented north-south, with a slight slope and drainage holes at the lower edge. The water supply system consists of a submersible pump, a main pipeline, and branch pipelines. The submersible pump draws water from the natural sea area, with a maximum summer water temperature <28℃. The drainage system consists of sewage pipes connected to each cultivation pond. This method enables large-scale artificial cultivation of seagrass; however, mold is prone to appear in the early stages of seed germination, and once it occurs, it persists throughout the entire seedling growth cycle, severely affecting the final seedling establishment rate.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a seawater circulation method, combined with a cultivation device and method for uniformly spreading and sowing seaweed, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a cultivation device for seagrass, comprising a seedling tank, wherein a grid support is provided inside the seedling tank, and a gap exists between the grid support and the bottom wall of the seedling tank, and further comprising: A leveling mechanism, located inside the seedling tray; A switching mechanism, which is connected to a leveling mechanism; The leveling mechanism includes an electric push rod, the output end of which is provided with a vertical plate. A pusher plate is elastically slidably connected to the side wall of the vertical plate, and a feeding box is fixedly connected to the side wall of the pusher plate. The vertical plate and the pusher plate are elastically slidably connected, so that the pusher plate can move laterally under the guidance of the vertical plate, thereby evenly spreading the culture medium. At the same time, a feeding box is fixedly connected to one side of the pusher plate for accurately sowing seaweed seeds onto the culture medium.

[0008] Preferably, a sleeve plate is fixedly connected to the top of the pusher plate, and the side wall of the sleeve plate slides against the side wall of the vertical plate. The bottom of the feeding box has several evenly spaced discharge holes, and the top of the feeding box is fixedly connected to a pair of feed pipes. During movement, the bottom of the pusher plate will flatten and evenly spread the culture medium, which has been placed in a strip-like pile by the worker, onto the surface of the sieve. Depending on the spreading pattern, the pusher plate can move back and forth, and if necessary, can be pushed back and forth multiple times to ensure the uniformity and thickness of the culture medium.

[0009] Preferably, a crossbar is fixedly connected to the inner cavity of the seedling pool on the side away from the electric push rod, and positioning sleeves are symmetrically slidably connected to both sides of the crossbar. Guide plates are fixedly connected to the side walls of the positioning sleeves, and the guide plates are all abutted against the inner wall of the seedling pool through support components.

[0010] Preferably, the top two sides of the pusher plate are slidably abutted against the inner sidewall of the guide plate through side plates, and the lower side of the guide plate is provided with a groove, and the side plates are slidably connected to the groove through sliders.

[0011] Preferably, a rotating rod is rotatably connected to the inner side of each pair of guide plates, and the sliders abut against the lower side of the rotating rods.

[0012] Preferably, the outer wall of the rotating rod is divided into three uniform sections: a concave-convex section, a concave surface section, and a convex surface section.

[0013] Preferably, the switching mechanism includes a worm gear fixed to the end of the rotating rod, a worm engaging with the outer wall of the worm gear, the end of the worm being rotatably connected to a guide plate, and a movable block being elastically slidably connected to the groove end of the guide plate.

[0014] Preferably, a ratchet is fixed to the bottom of the worm gear, and a pawl is engaged with the outer wall of the ratchet. Several pawls are provided, and each pawl is rotatably connected to the edge of the moving block.

[0015] Preferably, a sliding rod is rotatably connected to the middle of the multiple pawls, and the outer wall of the sliding rod is slidably connected to the upper side of the moving block. Driven by the electric push rod, the slider will move in the opposite direction with the push plate, while the moving block will reset under the elastic force of the spring. At this time, the moving block will drive the multiple pawls to move again, but due to the resistance of the sliding rod, these pawls will gradually retract into the moving block during the movement and will not mesh with the ratchet, ensuring that the worm maintains the characteristic of unidirectional rotation. Next, when the slider returns, the spring tension at the top of the push plate will guide the slider to move along the concave and convex sections, causing it to vibrate slightly and improving the accuracy of sowing.

[0016] This application also proposes a method for cultivating seagrass, employing the aforementioned seagrass cultivation apparatus, comprising: S1. Preliminary preparation and sowing: Set up a grid support in the seedling bed, lay a sieve on the grid support and set up a surrounding board. Use the flattening mechanism and the switching mechanism to spread the culture medium evenly. After the substrate is spread to a certain thickness, sow the seaweed seeds on the culture medium, ensuring that the seaweed seeds are 1.2-1.4cm away from the top surface of the substrate. S2. Seed germination promotion: Soak seeds in seawater with a salinity of 10-15‰ for 5-7 days at a water level of 20-40cm, changing the water every 3 days. Then, transition the seeds to seawater with a salinity of 20‰ and 25‰ for 2 days each at a water level of 20-40cm. Finally, place the seeds in normal seawater for cultivation at a water level of 35-40cm. S3. Seedling cultivation: Maintain a constant flow of water in the seedling pond, with a renewal rate of 25 times / day, and cultivate for 20-35 days at a seawater temperature of <25℃.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention creates a gap between the culture medium and the bottom wall of the seedling pool by setting up a grid support. Combined with the subsequent flowing water cultivation mode, this can reduce the formation of an anaerobic environment at the bottom and reduce the risk of mold spots appearing in the early stage of seed germination.

[0018] The pusher plate is driven by an electric push rod to move laterally back and forth, and to complete the precise operation of spreading the bottom layer of culture medium and covering the top layer of culture medium. This ensures that the seeds are placed at a uniform depth of 1.4-1.6cm, avoiding the problem of uneven thickness caused by manual spreading. This further reduces the occurrence of mold spots in the early stage of seed germination and effectively improves the establishment rate of vine seedlings by about 23-26%.

[0019] This invention facilitates accurate rotation switching of the rotating rod by using a combination of a moving block and a sliding rod. During switching, the electric actuator drives the slider to press the moving block into the guide plate. At this time, the moving block can drive the ends of multiple pawls to move simultaneously towards the ratchet. The sliding rod applies reverse resistance to the middle of the multiple pawls, causing the pawls to open laterally during movement and engage with the ratchet. This causes the worm gear to rotate synchronously with the ratchet, and finally the rotating rod rotates a certain distance, rotating the new side to the lower side, switching the contact surface of the slider, thereby adapting to the sowing step, automatically and evenly spreading the culture medium and seeds, reducing manual sowing time, and improving efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a schematic diagram showing the structural fit between the guide plate and the rotating rod of the present invention; Figure 4 This is a schematic diagram of the side cross-section structure of the present invention; Figure 5 For the present invention Figure 4 A magnified view of the structure at point A in the middle; Figure 6 This is a schematic diagram showing the structural fit between the guide plate and the side plate of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point B in the middle; Figure 8 This is a schematic diagram showing the structural fit between the guide plate and the moving block of the present invention; Figure 9 This is a schematic diagram showing the structural fit between the sliding rod and the pawl of the present invention; Figure 10 This is a schematic diagram showing the structural fit between the worm gear and the rotating rod of the present invention.

[0021] In the picture: 100. Seedling pool; 200. Electric actuator; 300. Grid support; 400. Pushing mechanism; 410. Horizontal bar; 420. Positioning sleeve; 430. Guide plate; 440. Rotating rod; 450. Support assembly; 460. Vertical plate; 470. Pushing plate; 480. Feed box; 490. Side plate; 4100. Sleeve plate; 4110. Feed pipe; 4120. Concave-convex section; 4130. Concave section; 4140. Convex section; 4150. Slider; 500. Switching mechanism; 510. Moving block; 520. Pawl; 530. Ratchet; 540. Worm gear; 550. Sliding rod; 560. Worm wheel. Detailed Implementation

[0022] The technical solutions of 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.

[0023] In recent years, seagrass beds have suffered severe decline globally due to the combined effects of the natural environment and human activities. Statistics show that at least 80% of the eelgrass beds in the coastal waters of Shandong Province have disappeared in the past 30 years, leading to the deterioration of the nearshore marine ecosystem in the Yellow and Bohai Seas and a sharp decline in fishery resources. Therefore, the ecological restoration of seagrass beds has become particularly necessary.

[0024] Currently, artificial seagrass cultivation is the main method for seagrass bed restoration. The restoration model of artificially cultivating eelgrass seedlings from seeds and then transplanting them to target sea areas has become relatively mature. For example, the Chinese patent application number 202110333149.1 achieved a seedling establishment rate of approximately 14.3%. Research has found that the manual process of laying the substrate and placing the seeds 1-2 cm deep within it resulted in poor uniformity in substrate thickness. Thicker areas were prone to creating anaerobic environments, which may be the main reason for the low seedling establishment rate and the resulting susceptibility to mold in the early stages of seed germination. Therefore, the applicant proposes the following technical solution: like Figures 1 to 10 As shown, the present invention provides a cultivation device for seaweed, including a seedling tank 100, a grid support 300 disposed within the seedling tank 100, a gap existing between the grid support 300 and the bottom wall of the seedling tank 100, and further comprising: The leveling mechanism 400 is located inside the seedling pool 100; The switching mechanism 500 is connected to the leveling mechanism 400; The pushing mechanism 400 includes an electric push rod 200, a vertical plate 460 at the output end of the electric push rod 200, a pusher plate 470 elastically slidably connected to the side wall of the vertical plate 460, and a feeding box 480 fixedly connected to the side wall of the pusher plate 470.

[0025] This application creates a gap between the culture medium and the bottom wall of the seedling pool 100 by setting up a grid support 300. Combined with the subsequent water flow cultivation mode, this can reduce the formation of an anaerobic environment at the bottom and reduce the risk of mold spots appearing in the early stage of seed germination. The pusher plate 740 is driven by an electric pusher rod 200 to move laterally back and forth, and completes the precise operation of spreading the bottom culture medium and covering the upper culture medium, ensuring that the seeds are placed at a uniform depth of 1-2cm, avoiding the problem of uneven thickness caused by manual spreading, thereby further reducing the appearance of mold spots in the early stage of seed germination and effectively improving the establishment rate of vine seedlings by about 23-26%.

[0026] Specifically, the electric actuator 200 drives the vertical plate 460 to move parallel and reciprocatingly through its output end. The vertical plate 460 and the pusher plate 470 are elastically slidably connected, allowing the pusher plate 470 to move laterally under the guidance of the vertical plate 460, thereby evenly spreading the culture medium. At the same time, a feeding box 480 is fixed to one side of the pusher plate 470 for accurately sowing seaweed seeds onto the culture medium. The switching mechanism 500, through its connection with the leveling mechanism 400, further realizes the flexible state of the pusher plate 470 at different operating stages, ensuring the efficient operation of the entire device in the seaweed cultivation process.

[0027] like Figures 2 to 7 As shown, a sleeve plate 4100 is fixedly connected to the top of the pusher plate 470, and the side wall of the sleeve plate 4100 slides against the side wall of the vertical plate 460. Several discharge holes are evenly distributed at the bottom of the feeding box 480, and a pair of feed pipes 4110 are fixedly connected to the top of the feeding box 480. A horizontal bar 410 is fixedly connected to the inner cavity of the seedling pool 100 on the side away from the electric push rod 200. Positioning sleeves 420 are symmetrically slidably connected to both sides of the horizontal bar 410. Guide plates 430 are fixedly connected to the side walls of the positioning sleeves 420, and the guide plates 430 are all connected to the support assembly 4. 50 abuts against the inner wall of the seedling pool 100; the top two sides of the pusher plate 470 slide against the inner side wall of the guide plate 430 through the side plate 490, and the lower side of the guide plate 430 is provided with a groove, and the side plate 490 is slidably connected to the groove through the slider 4150; the inner side of the pair of guide plates 430 is rotatably connected to the rotating rod 440, and the slider 4150 abuts against the lower side of the rotating rod 440; the outer wall of the rotating rod 440 is divided into three uniform sections, namely the concave-convex section 4120, the concave section 4130 and the convex section 4140.

[0028] The above-mentioned scheme employs a support assembly 450, primarily composed of a threaded rod, a rotating sleeve, and a rubber base. The threaded rod allows adjustment of the pressure exerted on the guide plate 430 and the inner wall of the seedling pool 100, thereby positioning the guide plate 430 and facilitating disassembly. After the sieve silk is laid, the electric actuator 200 is activated, pushing the vertical plate 460 laterally across the top of the grid support 300. During this process, the pusher plate 470 also moves as a whole, ensuring that the two side plates 490 slide against the inner wall of the guide plate 430. Simultaneously, the spring tension applies an upward force to the pusher plate 470, ensuring that the slider 4150 remains in contact with the convex section 4140, guaranteeing smooth movement. As the pusher plate 470 moves, it flattens and evenly spreads the strip-shaped culture medium placed by the worker onto the surface of the sieve silk. Depending on the spreading pattern, the pusher plate 470 can reciprocate, and if necessary, can be pushed back and forth multiple times to ensure the uniformity and thickness of the culture medium.

[0029] like Figure 3 , Figures 8 to 10 As shown, the switching mechanism 500 includes a worm gear 560 fixed to the end of the rotating rod 440, a worm 540 meshing with the outer wall of the worm gear 560, the end of the worm 540 being rotatably connected to the guide plate 430, and a moving block 510 being elastically slidably connected to the groove end of the guide plate 430; a ratchet 530 fixed to the bottom of the worm 540, a pawl 520 being engaged with the outer wall of the ratchet 530, a number of pawls 520 being provided, and all pawls 520 being rotatably connected to the edge of the moving block 510; a sliding rod 550 being rotatably connected to the middle of the multiple pawls 520, and the outer wall of the sliding rod 550 being slidably connected to the upper side of the moving block 510.

[0030] The above scheme employs the following method: through the meshing of the worm 540 and the worm wheel 560, the rotation of the worm 540 will cause the rotating rod 440 to rotate a certain distance, causing the concave-convex section 4120 to rotate to the lower side, thereby switching the contact surface of the slider 4150. This switching signifies that the sowing process is ready to enter the next operation. Driven by the electric actuator 200, the slider 4150 will move in the opposite direction following the pusher plate 470, while the moving block 510 will reset under the elastic force of the spring. At this time, the moving block 510 again drives multiple pawls 520 to move, but due to the resistance of the sliding rod 550, these pawls 520 will gradually retract into the moving block 510 during the movement, not engaging with the ratchet wheel 530, ensuring that the worm 540 maintains its unidirectional rotation characteristic. Next, when the slider 4150 returns, the spring tension at the top of the pusher plate 470 will guide the slider 4150 to move along the concave-convex section 4120, causing it to vibrate slightly and improving the accuracy of sowing. During this process, the staff opens the valve of the external seaweed seed hopper, allowing the seaweed seeds to flow smoothly into the feeding box 480 through the feed pipe 4110. Through the evenly spaced feeding holes at the bottom, the seaweed seeds are sown onto the culture medium, and the vibration of the pusher plate 470 effectively reduces clogging of the feeding holes. Similarly, after feeding is complete, the electric push rod 200 drives the pusher plate 470 to move towards the horizontal bar 410. At this time, the slider 4150 presses against the moving block 510, and the rotating rod 440 rotates again, causing the concave section 4130 to rotate downwards and contact the slider 4150. At this stage, the staff needs to place a portion of the culture medium in strips on top of the freshly sown seaweed seeds. Using the pusher plate 470, which moves upwards a short distance and is then pushed back and forth, the culture medium is evenly spread on the surface of the seaweed seeds.

[0031] This application also proposes a method for cultivating seagrass, the method being as follows: S1. Preliminary preparation and sowing: Set up a grid support 300 in the seedling pond 100. Lay a sieve on the grid support 300 and set up a surrounding board on the perimeter. Use the flattening mechanism 400 and the switching mechanism 500 to spread the culture medium evenly. After the substrate has been spread to a certain thickness, sow the seaweed seeds on the culture medium, ensuring that the seaweed seeds are 1.2-1.4cm away from the top surface of the substrate. Preferably, the seaweed seeds are initially sorted using a 1.8mm perforated sieve, then further sorted using a 2.2mol / L sucrose solution, and subsequently soaked in normal seawater and stored at 4°C for 4 weeks. Preferably, the culture medium is prepared from mud, sand, and slow-release fertilizer in a mass ratio of 10:30:1, wherein the mud and sand are sourced from the sea area, and the slow-release fertilizer is purchased externally.

[0032] S2, Promoting Seed Germination: Soak the seedlings in seawater with a salinity of 10-15‰ for 5-7 days at a water level of 20-40cm. Change the water every 3 days. Then, transition them to seawater with a salinity of 20‰ and 25‰ for 2 days each. Finally, place them in normal seawater for cultivation at a water level of 35-40cm. S3, Seedling Cultivation: Maintain a constant flow of water in the seedling pond, with a renewal rate of 25 times per day, and cultivate the seedlings for 20-35 days at a seawater temperature of <25℃. The entire seedling cultivation process is carried out in a greenhouse without the need for heating. The entire cycle takes approximately 1.5-2.5 months. The final height of the seaweed seedlings is approximately 5.2±0.7cm, with a success rate of approximately 24.6%. Compared to the previous method (final height approximately 5.1±1.4cm, success rate approximately 14.4%), the success rate of seaweed seedlings cultivated using the seaweed cultivation device and method described in this application is significantly improved, and the seedlings exhibit better growth uniformity.

[0033] Working principle and usage process of this invention: First, a grid support 300 is installed inside the seedling pond 100, ensuring a gap between it and the bottom wall of the seedling pond 100 to allow for free water flow. A surrounding board is installed around the grid support 300 to prevent the culture medium from being washed away by seawater. Then, a sieve is laid in the area where the surrounding board is located, which serves to retain the culture medium and ensure sufficient contact between the culture medium and seawater, preventing the formation of an anaerobic or hypoxic environment. Next, workers mix mud, sand, and slow-release fertilizer in a preset ratio to form a culture medium, which is then poured into strips onto the sieve. At this point, the slider 4150 abuts against the convex section 4140 of the rotating rod 440. The electric actuator 200 is activated, pushing the vertical plate 460 to move laterally at the top of the grid support 300, and the pusher plate 470 moves synchronously with the vertical plate 460, meaning that both side plates 490 slide on the inner wall of the guide plate 430. At the same time, under the tension of the spring, an upward pulling force is applied to the pusher plate 470, which will cause the slider 4150 to always move against the convex section 4140. After that, the bottom of the pusher plate 470 can push the strip-shaped culture medium to be piled up and spread on the surface of the sieve silk during the movement. The pusher plate 470 can also be moved back and forth several times depending on the spreading situation. After the bottom culture medium is laid, continue pushing the pusher plate 470 until the slider 4150 presses the moving block 510 into the guide plate 430. At this time, the moving block 510 can drive the ends of multiple pawls 520 to move simultaneously towards the ratchet 530. Under the action of inertia, the sliding rod 550 has reverse resistance, which applies reverse resistance to the middle of the multiple pawls 520, causing the pawls 520 to open laterally during the movement until the sliding rod 550 abuts against the moving block 510. The pawls 520 remain open and engage with the ratchet 530, causing the worm gear 540 to rotate synchronously with the ratchet 530. Through the worm gear 540 meshing with the worm wheel 560 to rotate, the rotating rod 440 rotates a certain distance, rotating the concave-convex section 4120 to the lower side, switching the abutting surface of the slider 4150. After switching, driven by the electric actuator 200, the slider 4150 moves in the opposite direction to the pusher plate 470, while the moving block 510 moves and resets under the force of the compression spring. At this time, the moving block 510 also drives multiple pawls 520 to move first, and under the resistance of the sliding rod 550, the pawls 520 retract into the moving block 510 during the movement, not engaging with the ratchet 530, maintaining the unidirectional rotation characteristic of the worm gear 540. Then, when the slider 4150 returns, under the tension of the spring at the top of the pusher plate 470, the slider 4150 moves along the concave-convex section 4120, causing the pusher plate 470 to vibrate slightly. At the same time as the return, the external seaweed seed hopper valve is opened, allowing the seaweed seeds to enter the feeding box 480 through the feed pipe 4110, and then be sown through the evenly spaced feeding holes at the bottom, with the vibration process reducing the clogging of the feeding holes. After the feeding is completed, the electric actuator 200 drives the pusher plate 470 to move towards the crossbar 410 again, and then the slider 4150 presses the moving block 510 again. Finally, the rotating rod 440 rotates a distance again, turning the concave section 4130 to the lower side to abut against the slider 4150. At this time, the staff needs to pour some culture medium in strips on top of the freshly sown seaweed seeds. The pusher plate 470, which has moved up a short distance, pushes the culture medium back and forth to make the culture medium evenly spread on the surface of the seaweed seeds, ensuring that most of the seaweed seeds are at the same depth, further improving the establishment rate and growth uniformity of the seaweed seedlings. After the culture medium and seaweed seeds are laid, the leveling mechanism 400 can be transferred to the next seedling pond for the next batch of this seed.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] 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 device for cultivating seagrass, comprising a seedling tank (100), characterized in that, A grid support (300) is installed inside the seedling pool (100), and there is a gap between the grid support (300) and the bottom wall of the seedling pool (100). An electric actuator (200) is fixedly connected to the side wall of the seedling pool (100). The seedling pool (100) also includes: A leveling mechanism (400) is located inside the seedling pool (100); A switching mechanism (500) is connected to a flattening mechanism (400); The pushing mechanism (400) includes an electric push rod (200), the output end of which is provided with a vertical plate (460), and the side wall of the vertical plate (460) is elastically slidably connected to a pusher plate (470), and the side wall of the pusher plate (470) is fixedly connected to a feeding box (480).

2. The seagrass cultivation device according to claim 1, characterized in that, The pusher plate (470) is fixedly connected to the top of the sleeve plate (4100), and the side wall of the sleeve plate (4100) slides against the side wall of the vertical plate (460). The bottom of the feed box (480) is evenly provided with several discharge holes, and the top of the feed box (480) is fixedly connected to a pair of feed pipes (4110).

3. The seagrass cultivation device according to claim 2, characterized in that, A crossbar (410) is fixedly connected to the side of the inner cavity of the seedling pool (100) away from the electric push rod (200). Positioning sleeves (420) are symmetrically slidably connected to both sides of the crossbar (410). Guide plates (430) are fixedly connected to the side walls of the positioning sleeves (420). The guide plates (430) are all abutted against the inner wall of the seedling pool (100) through the support assembly (450).

4. The seagrass cultivation device according to claim 3, characterized in that, The top two sides of the pusher plate (470) are slidably abutted against the inner sidewall of the guide plate (430) through the side plate (490). The guide plate (430) has a groove on its lower side, and the side plate (490) is slidably connected to the groove through the slider (4150).

5. The seagrass cultivation device according to claim 4, characterized in that, A rotating rod (440) is rotatably connected to the inner side of each pair of guide plates (430), and the sliders (4150) abut against the lower side of the rotating rods (440).

6. The seagrass cultivation device according to claim 5, characterized in that: The outer wall of the rotating rod (440) is divided into three uniform sections, namely the concave-convex section (4120), the concave section (4130), and the convex section (4140).

7. The seagrass cultivation device according to claim 6, characterized in that, The switching mechanism (500) includes a worm gear (560) fixed to the end of the rotating rod (440), a worm (540) meshing with the outer wall of the worm gear (560), the end of the worm (540) being rotatably connected to the guide plate (430), and a moving block (510) being elastically slidably connected to the groove end of the guide plate (430).

8. The seagrass cultivation device according to claim 7, characterized in that, The bottom of the worm (540) is fixedly connected to a ratchet (530), and a pawl (520) is engaged with the outer wall of the ratchet (530). A number of pawls (520) are provided, and each pawl (520) is rotatably connected to the edge of the moving block (510).

9. The seagrass cultivation device according to claim 8, characterized in that, The middle of the multiple pawls (520) is rotatably connected to a sliding rod (550), and the outer wall of the sliding rod (550) is slidably connected to the upper side of the moving block (510).

10. A method for seagrass cultivation, employing the seagrass cultivation apparatus as described in claim 1, characterized in that, The method for seagrass cultivation includes: S1. Preliminary preparation and sowing: Set up a grid support (300) in the seedling pool (100), lay a sieve on the grid support (300) and set up a surrounding board on the perimeter. The culture medium is evenly spread by the cooperation of the leveling mechanism (400) and the switching mechanism (500). After the substrate is spread to a certain thickness, sow the seaweed seeds on the culture medium, ensuring that the seaweed seeds are 1.2-1.4cm away from the top surface of the substrate. S2. Seed germination promotion: Soak seeds in seawater with a salinity of 10-15‰ for 5-7 days in a seedling pond (100), with a water level of 20-40cm. Change the water every 3 days. Then, transition the seeds to seawater with a salinity of 20‰ and 25‰ for 2 days each, with a water level of 20-40cm. Finally, place the seeds in normal seawater for cultivation, with a seawater level of 35-40cm. S3. Seedling cultivation: Maintain a constant flow of water in the seedling pond (100), with a renewal rate of 25 times / day, and cultivate for 20-35 days at a seawater temperature of <25℃.

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