Debonding, separating and hatching integrated device for fertilized eggs of septiceps septentrionalis

Abstract

The invention belongs to the technical field of mariculture, and discloses a rudon septentrionalis fertilized egg debonding, separating and hatching integrated device which comprises a main body shell and further comprises an adjusting and limiting assembly arranged in the main body shell; the filtering assembly is arranged in the adjusting and limiting assembly and used for limiting, scattering and separating the eggs; the stirring assembly is mounted at the bottom of the main body shell and is used for carrying out aeration stirring on seawater in the main body shell; the adjusting and limiting assembly comprises a main body support slidably connected with the main body shell, through cooperation of the adjusting and limiting assembly, the filtering assembly and other structures, eggs can be conveniently placed, the adjusting frame is pushed by the first telescopic rod to move so as to control the main body support to move up and down, and then the position of the sliding frame is controlled; the sliding frame is moved to the upper side of the placing opening, so that the eggs soaked with the tannic acid can be conveniently placed into the lower side of the sliding frame from the placing opening.

Description

Technical Field

[0001] The present invention belongs to the technical field of mariculture, and specifically relates to an integrated device for de-adhesion, separation, and hatching of fertilized eggs of Thamnaconus septentrionalis Background Art

[0002] Thamnaconus septentrionalis has a laterally compressed and oblong body shape, and is also known as the leather fish, mouse fish, or baby rat fish. It is a warm-temperate demersal fish that inhabits areas with a water depth of 50-120 meters. It likes to move in groups and has high economic value

[0003] When artificially hatching the sperm and eggs of Thamnaconus septentrionalis, it is necessary to de-adhere and separate the mucus on the egg body. The tannic acid solution method is designed for the characteristics of sticky eggs of marine fish, and is especially suitable for small eggs such as Thamnaconus septentrionalis. The fertilized eggs are immersed in the tannic acid solution and continuously aerated and stirred for 30-50 seconds. Subsequently, it is necessary to rinse with clean seawater to remove residual acid liquid and some impurities, such as egg membrane fragments, viscous substances, and other organic impurities. Generally, a large amount of seawater is used for rinsing during the cleaning process, and then wait for it to stand still to remove impurities. However, the impurities vary in size, and some impurity diameters will be larger than the egg body, and it is difficult to remove them simply by standing still. Therefore, an integrated device for de-adhesion, separation, and hatching of fertilized eggs of Thamnaconus septentrionalis is proposed Summary of the Invention

[0004] To solve the problem that the impurities remaining after de-adhesion in the above background art are difficult to completely remove, the present invention provides an integrated device for de-adhesion, separation, and hatching of fertilized eggs of Thamnaconus septentrionalis

[0005] To achieve the above object, the present invention provides the following technical solution: An integrated device for de-adhesion, separation, and hatching of fertilized eggs of Thamnaconus septentrionalis, including a main body housing, and further including:

[0006] An adjustment and limit component, which is arranged inside the main body housing

[0007] A filtering component, which is arranged inside the adjustment and limit component for limiting the eggs and separating them by breaking them up

[0008] A stirring component, which is installed at the bottom of the main body housing for aerating and stirring the seawater inside the main body housing

[0009] Among them, the adjustment and limit component includes a main body support frame slidably connected to the main body housing. A pair of support crossbars are fixedly connected to the middle of the main body support frame. A pair of adjustment frames are fixedly connected to the top of the main body support frame. A sliding frame is slidably connected to the middle of the main body support frame

[0010] The filtering component includes a first screen fixedly connected to the bottom of the main body support frame and a second screen fixedly connected to the inside of the sliding frame. A plurality of traction ropes are distributed in a rectangular shape on the top of the first screen, and a floating body is fixedly connected to the middle of the traction rope

[0011] Preferably, the adjustment frame is slidably connected to the main body housing. A first telescopic rod is fixedly connected to the bottom of each of the pair of adjustment frames. The first telescopic rod is located outside the main body housing and is fixedly connected to the bottom of the main body housing. A pair of sliding frames are fixedly connected to the top of the sliding frame, and a second telescopic rod is fixedly connected to the top of each of the pair of sliding frames.

[0012] Preferably, the sliding frame matches the bottom frame of the main body bracket. At the same time, both the main body bracket and the sliding frame are slidably connected to the inner wall of the main body housing. The second telescopic rod is located inside the main body bracket. The output end of the second telescopic rod penetrates the middle of the main body bracket and is connected to the sliding frame. The second telescopic rod is fixedly connected to the middle of the main body bracket.

[0013] Preferably, the filtering assembly further includes a third screen fixedly connected inside the main body housing. The first screen is located between the third screen and the second screen. A sliding blocking member is distributed in a rectangular shape in the middle of the second screen. The traction rope passes through the inside of the sliding blocking member, and a floating body is fixedly connected to the upper end of the traction rope.

[0014] Preferably, the second screen and the third screen have the same aperture and the aperture is smaller than the egg diameter, and the aperture of the first screen is larger than the egg diameter.

[0015] Preferably, the second screen is located below the placement opening, the floating body is located above the second screen, and the top of the traction rope is fixedly connected to the support cross bar.

[0016] Preferably, the stirring assembly includes a pair of motors and a pair of air delivery discs installed at the bottom of the main body housing. The output end of the motor penetrates the main body housing and is fixedly connected to a stirring paddle. An air delivery pipe is fixedly connected to the side of the air delivery disc.

[0017] Preferably, the air delivery disc is located below the stirring paddle. The air delivery disc penetrates the main body housing and is externally connected to an inflation device. The stirring paddle is located in the middle of the inclined surface at the bottom of the main body housing.

[0018] Preferably, a placement opening is provided on the side of the main body housing, and a water changing assembly is provided inside the main body housing;

[0019] Among them, the water changing assembly includes a water inlet fixedly connected to the top of the main body bracket and a plurality of water blowing ports fixedly connected to the bottom of the main body bracket. A drainage channel is provided inside the main body bracket, and an inclined surface is provided at the bottom of the inner wall of the main body bracket. The drainage channel is located at the bottom of the inclined surface.

[0020] Preferably, when the seawater inside the main body housing is higher than the second screen, at this time, the floating body floats on the top of the seawater by its own buoyancy. At the same time, the floating body pulls the first screen through the traction rope, and the first screen is pulled to undulate and shake synchronously with the undulation of the water surface by the floating body.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention facilitates the placement of egg bodies by setting the coordination of the adjustment limit assembly and the filtering assembly, and the first telescopic rod pushes the adjustment frame to move, thereby controlling the main frame to move up and down, and then controlling the position of the sliding frame, so that the sliding frame moves to the upper side of the placement opening, and then facilitates the egg bodies soaked in tannic acid to be placed from the placement opening into the lower side of the sliding frame, and the first screen and the second screen limit the upper and lower positions of the accumulated egg bodies;

[0023] The present invention facilitates separation of impurities from the egg body by arranging the cooperation of structures such as the filtering component and the stirring component. The stirring component rotates to generate a water flow containing bubbles to push the eggs to float and disperse the eggs. At the same time, the bubbles absorb the impurities and carry the impurities to the top of the second screen, thereby separating some small-diameter impurities from the egg body. At the same time, the dispersed egg body can fall through the first screen, thereby separating large-diameter impurities from the egg body, so as to facilitate separation of impurities.

[0024] The present invention facilitates the removal of remaining impurities by arranging the coordination of structures such as the third screen and the water changing component. The egg body is supported by the third screen to prevent the egg body from sinking to the bottom, and the remaining small-diameter impurities fall from the third screen to the bottom of the main body shell. At the same time, the impurities that have settled to the bottom are discharged synchronously through the suction force during water change, thereby further blowing away the impurities. At the same time, the main body bracket can be moved out from the inside of the main body shell, so that the main body shell can be used to hatch the egg body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 It is a side partial cross-sectional view of the present invention;

[0027] Figure 3 It is a front partial cross-sectional view of the present invention;

[0028] Figure 4 for Figure 3 The enlarged schematic diagram at A in the middle;

[0029] Figure 5 A cross-sectional schematic diagram of adjusting the limit stop assembly of the present invention;

[0030] Figure 6 It is an enlarged cross-sectional view of the stirring assembly of the present invention;

[0031] Figure 7 This is a schematic diagram of the disassembly of the limit adjustment component of the present invention.

[0032] In the figure: 1. Main body housing; 2. Adjusting and limiting component; 201. Main body support; 202. Support cross bar; 203. Adjusting frame; 204. First telescopic rod; 205. Sliding frame; 206. Second telescopic rod; 3. Filtering component; 301. First sieve; 302. Second sieve; 303. Third sieve; 304. Sliding blocking piece; 305. Traction rope; 306. Floating body; 4. Stirring component; 401. Motor; 402. Stirring paddle; 403. Air delivery disc; 404. Air delivery pipeline; 5. Placing opening; 6. Water changing component; 601. Water inlet; 602. Drainage channel; 603. Water blowing opening. Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1 to 7 shown, the present invention provides an integrated device for de - sticking, separating and hatching fertilized eggs of Thamnaconus septentrionalis, which includes a main body housing 1, and also includes:

[0035] An adjusting and limiting component 2, which is arranged inside the main body housing 1;

[0036] A filtering component 3, which is arranged inside the adjusting and limiting component 2 for limiting the eggs and separating and dispersing them;

[0037] A stirring component 4, which is installed at the bottom of the main body housing 1 for aerating and stirring the seawater inside the main body housing 1;

[0038] Among them, the adjusting and limiting component 2 includes a main body support 201 slidably connected to the main body housing 1. A pair of support cross bars 202 are fixedly connected to the middle of the main body support 201. A pair of adjusting frames 203 are fixedly connected to the top of the main body support 201. A sliding frame 205 is slidably connected to the middle of the main body support 201;

[0039] The filtering component 3 includes a first sieve 301 fixedly connected to the bottom of the main body support 201 and a second sieve 302 fixedly connected inside the sliding frame 205. A plurality of traction ropes 305 are distributed in a rectangular shape at the top of the first sieve 301. A floating body 306 is fixedly connected to the middle of the traction ropes 305.

[0040] Adopt the above solution: Air is discharged through the air delivery disc 403, and the stirring paddle 402 disperses the bubbles and mixes them into the water flow, so that the water flow impacts the eggs through the third screen 303 and the first screen 301, washing away the residual tannic acid and impurities on the eggs. At the same time, the bubbles adsorb small-diameter impurities and carry them to the water surface. The dispersed eggs fall from the first screen 301 to the top of the third screen 303, and the water flow impacts the floating body 306 to float up and down, causing the floating body 306 to drive the first screen 301 to vibrate through the towing rope 305, shaking and dispersing the agglomerated eggs, thus completing the separation.

[0041] As Figure 2 , Figure 3 and Figure 7 shown, the adjustment frame 203 is slidably connected to the main body housing 1. Both bottoms of a pair of adjustment frames 203 are fixedly connected to the first telescopic rod 204. The first telescopic rod 204 is located outside the main body housing 1 and its bottom is fixedly connected to the main body housing 1. The top of the sliding frame 205 is fixedly connected with a pair of sliding frames 205, and both tops of the pair of sliding frames 205 are fixedly connected to the second telescopic rod 206.

[0042] Adopt the above solution: By pushing the adjustment frame 203 to move upward along the main body housing 1 through the first telescopic rod 204, the sliding frame 205 can be driven to move upward synchronously, so that the sliding frame 205 moves to a position higher than the placement opening 5, making the placement opening 5 located below the sliding frame 205. Then it is convenient to place the eggs soaked in tannic acid from the placement opening 5 into the lower side of the sliding frame 205, and the first screen 301 and the second screen 302 limit the eggs stacked up and down.

[0043] As Figures 2 to 5 shown, the sliding frame 205 matches the bottom frame of the main body support 201. At the same time, both the main body support 201 and the sliding frame 205 are slidably connected to the inner wall of the main body housing 1. The second telescopic rod 206 is located inside the main body support 201. The output end of the second telescopic rod 206 penetrates through the middle of the main body support 201 and is connected to the sliding frame 205. The second telescopic rod 206 is fixedly connected to the middle of the main body support 201.

[0044] Adopt the above solution: By setting the sliding frame 205, the sliding frame 205 slides up and down along the main body support 201, so that the sliding frame 205 can fit with the bottom frame of the main body support 201, blocking the impurities between the first screen 301 and the second screen 302 and preventing them from flowing out through the placement opening 5 with the water flow. The second telescopic rod 206 is used to control the up and down movement of the sliding frame 205.

[0045] As Figure 2 , Figure 3 , Figure 4 and Figure 7As shown in the figure, the filtering component 3 further includes a third screen 303 fixedly connected inside the main body housing 1. The first screen 301 is located between the third screen 303 and the second screen 302. The middle part of the second screen 302 is rectangularly distributed with sliding blocking members 304. The towing rope 305 passes through the inside of the sliding blocking members 304. The upper end of the towing rope 305 is fixedly connected with a floating body 306. The second screen 302 and the third screen 303 have the same aperture and the aperture is smaller than the egg diameter. The aperture of the first screen 301 is larger than the egg diameter. The second screen 302 is located below the placement opening 5, and the floating body 306 is located above the second screen 302. The top of the towing rope 305 is fixedly connected with the support cross bar 202.

[0046] Adopting the above scheme: By setting the filtering component 3, after the eggs are placed between the second screen 302 and the first screen 301, at this time, the eggs are blocked by the first screen 301 due to their large quantity. At this time, inflation and stirring are carried out through the stirring paddle 402 and the air delivery disc 403, so that the accumulated eggs are pushed and floated by the water flow containing fine bubbles. At this time, the eggs will be blocked by the second screen 302, so that the impurities smaller than the eggs enter the top of the second screen 302 through the second screen 302.

[0047] The flow of the water will cause fluctuations on the water surface, causing the floating body 306 to be pushed up and down. The floating body 306 pulls the first screen 301 to vibrate up and down through the towing rope 305, so as to shake off the eggs agglomerated by residual mucus at the top of the first screen 301. At the same time, the scattered eggs can fall through the first screen 301 to the middle of the first screen 301 and the third screen 303, and the impurities larger than the eggs are left on the upper side of the first screen 301.

[0048] As Figure 2 and Figure 6 shown in the figure, the stirring component 4 includes a pair of motors 401 and a pair of air delivery discs 403 installed at the bottom of the main body housing 1. The output end of the motor 401 penetrates the main body housing 1 and is fixedly connected with a stirring paddle 402. The side of the air delivery disc 403 is fixedly connected with an air delivery pipe 404. The air delivery disc 403 is located below the stirring paddle 402. The air delivery disc 403 penetrates the main body housing 1 and is externally connected with an inflation device. The stirring paddle 402 is located in the middle of the inclined surface at the bottom of the main body housing 1.

[0049] Adopt the above solution: By setting up the stirring assembly 4, the stirring paddle 402 is driven by the motor 401 to rotate, causing the stirring paddle 402 to agitate the seawater inside the main body housing 1. At the same time, the air delivery pipeline 404 inflates the air delivery disc 403 through an external fan box, and bubbles are emitted from the air delivery disc 403, so that the stirring paddle 402 agitates and breaks the bubbles into tiny bubbles. Part of the small-diameter impurities are adsorbed by the bubbles and move to the top of the second screen 302 through the second screen 302, making the small-diameter impurities float on the water surface. When the second screen 302 and the first screen 301 are pulled out from the inside of the main body housing 1, part of the small-diameter impurities on the water surface can be removed from the main body housing 1 by the overlapping first screen 301 and second screen 302.

[0050] As Figure 2 , Figure 3 and Figure 6 shown, a placement opening 5 is provided on the side of the main body housing 1, and a water-changing assembly 6 is arranged inside the main body housing 1; among them, the water-changing assembly 6 includes a water inlet 601 fixedly connected to the top of the main body support 201 and a plurality of water blowing ports 603 fixedly connected to the bottom of the main body support 201 respectively. A drainage channel 602 is provided inside the main body support 201, and an inclined surface is provided at the bottom of the inner wall of the main body support 201. The drainage channel 602 is located at the bottom of the inclined surface. When the seawater inside the main body housing 1 is higher than the second screen 302, at this time, the floating body 306 floats on the top of the seawater by its own buoyancy. At the same time, the floating body 306 pulls the first screen 301 through the towing rope 305, and the first screen 301 is synchronously pulled by the floating body 306 with the undulation of the water surface to perform undulating vibration.

[0051] Adopt the above solution: The design of the water-changing assembly 6 is used to replace the seawater inside the main body housing 1. The drainage channel 602 provided on the lower side of the inclined surface inside the main body housing 1 sucks the small-diameter impurities and the seawater falling along the inclined surface to the bottom of the main body housing 1, and then discharges them through the water blowing ports 603. At the same time, the water inlet 601 provided on the upper side of the main body housing 1 replenishes seawater into the main body housing 1;

[0052] Before transferring the eggs into the main body housing 1, seawater will be pre-filled into the main body housing 1 until the water surface rises to the middle position of the placement opening 5. At this time, it is convenient to place the eggs soaked in tannic acid, and the impurities carried by the bubbles can float on the upper side of the main body housing 1.

[0053] The working principle and usage process of the present invention: When working, first fill seawater through the water inlet 601 to the middle of the placement opening 5, then adjust the movement of the main body support 201 so that the sliding frame 205 is higher than the placement opening 5 while the first screen 301 is lower than the placement opening 5. Then, pour the eggs from the placement opening 5 under the sliding frame 205, and the first telescopic rod 204 pulls the adjustment frame 203 to drive the main body support 201 to reset;

[0054] Then, the motor 401 and the external air-filling device are started, and the water body is stirred by the stirring paddle 402. At the same time, the air delivery plate 403 discharges air, and the stirring paddle 402 breaks up the bubbles and mixes them into the water flow, so that the water flow passes through the third screen 303 and the first screen 301 to impact the egg body, and the residual tannic acid and impurities on the egg body are washed away. The small-diameter impurities are carried and moved to the water surface by the bubbles, and the dispersed egg bodies fall from the first screen 301 to the top of the third screen 303. At the same time, the water flow impacts the float 306 to float up and down, so that the float 306 drives the first screen 301 to shake, and the clumped egg bodies are shaken and dispersed;

[0055] When all the eggs move to the lower side of the first screen 301, the second telescopic rod 206 pushes the sliding frame 205 downward to contact and close with the lower frame of the main support 201, sealing the large-diameter impurities on the upper side of the first screen 301, and then the first telescopic rod 204 pushes the adjustment frame 203 to drive the main support 201 to move out of the main housing 1;

[0056] After that, the motor 401 can be stopped, and the main shell 1 can be used as an incubation place for eggs. The fine impurities remaining between the eggs will pass through the third screen 303 and be carried out by the water flow when the water is changed. The stirring paddle 402 and the air delivery disk 403 can be started periodically to supplement oxygen to the water body.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for debonding, separating and hatching fertilized eggs of greenfin pufferfish, comprising a main body shell (1), characterized in that: Also includes: An adjustment limit assembly (2) is arranged inside the main housing (1); A filtering component (3) is arranged inside the position adjustment and limiting component (2) and is used to limit the position of the eggs and to break them up and separate them; A stirring assembly (4), which is mounted at the bottom of the main body shell (1) and is used to aerate and stir the seawater inside the main body shell (1); The adjustment and limiting assembly (2) comprises a main body bracket (201) slidably connected to the main body shell (1), a pair of supporting cross bars (202) are fixedly connected to the middle of the main body bracket (201), a pair of adjustment brackets (203) are fixedly connected to the top of the main body bracket (201), and a sliding bracket (205) is slidably connected to the middle of the main body bracket (201); The filter assembly (3) comprises a first screen (301) fixedly connected to the bottom of the main support (201) and a second screen (302) fixedly connected to the inside of the sliding frame (205); a plurality of traction ropes (305) are distributed in a rectangular shape on the top of the first screen (301); a floating body (306) is fixedly connected to the middle of the traction rope (305).

2. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 1, characterized in that: The adjustment frame (203) is slidably connected to the main body shell (1); the bottoms of a pair of the adjustment frames (203) are fixedly connected to a first telescopic rod (204); the first telescopic rod (204) is located outside the main body shell (1) and the bottoms are fixedly connected to the main body shell (1); the tops of the sliding frames (205) are fixedly connected to a pair of sliding frames (205); the tops of the pair of sliding frames (205) are fixedly connected to a second telescopic rod (206).

3. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 2, characterized in that: The sliding frame (205) matches the bottom frame of the main frame (201); the main frame (201) and the sliding frame (205) are both slidably connected to the inner wall of the main shell (1); the second telescopic rod (206) is located on the inner side of the main frame (201); the output end of the second telescopic rod (206) penetrates the middle of the main frame (201) and is connected to the sliding frame (205); the second telescopic rod (206) is fixedly connected to the middle of the main frame (201).

4. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 1, characterized in that: The filter assembly (3) further comprises a third screen (303) fixedly connected to the inside of the main body shell (1); the first screen (301) is located between the third screen (303) and the second screen (302); a sliding blocking member (304) is distributed in a rectangular shape in the middle of the second screen (302); the traction rope (305) passes through the inside of the sliding blocking member (304); and a float (306) is fixedly connected to the upper end of the traction rope (305).

5. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 4, characterized in that: The second sieve (302) and the third sieve (303) have the same aperture and the aperture is smaller than the egg diameter, and the aperture of the first sieve (301) is larger than the egg diameter.

6. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 4, characterized in that: The second screen (302) is located at the lower side of the placement opening (5), the floating body (306) is located at the upper side of the second screen (302), and the top of the traction rope (305) is fixedly connected to the supporting cross bar (202).

7. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 1, characterized in that: The stirring assembly (4) comprises a pair of motors (401) and a pair of gas delivery discs (403) mounted on the bottom of the main housing (1); the output end of the motor (401) penetrates the main housing (1) and is fixedly connected to a stirring paddle (402); and the side of the gas delivery disc (403) is fixedly connected to a gas delivery pipeline (404).

8. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 7, characterized in that: The gas delivery disc (403) is located at the lower side of the stirring paddle (402), the gas delivery disc (403) penetrates the main shell (1) and is externally connected to an air charging device, and the stirring paddle (402) is located at the middle of the bottom slope of the main shell (1).

9. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 1, characterized in that: A placement opening (5) is provided on the side of the main body shell (1), and a water changing assembly (6) is arranged inside the main body shell (1); The water changing assembly (6) comprises a water inlet (601) respectively fixedly connected to the top of the main frame (201) and a plurality of water blowing ports (603) fixedly connected to the bottom of the main frame (201); a drainage channel (602) is provided inside the main frame (201); an inclined surface is provided at the bottom of the inner wall of the main frame (201); and the drainage channel (602) is located at the bottom of the inclined surface.

10. The integrated device for debonding, separating and hatching fertilized eggs of greenfin puffer fish according to claim 1, characterized in that: When the seawater inside the main body shell (1) is higher than the second screen (302), the float (306) floats on the top of the seawater by its own buoyancy, and at the same time the float (306) pulls the first screen (301) by the traction rope (305), and the float (306) pulls the first screen (301) synchronously with the rise and fall of the water surface to cause it to fluctuate.

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