Environment-friendly lake water surface duckweed treatment and recycling device

Abstract

The invention discloses an environment-friendly lake water surface duckweed treatment and recycling device which comprises overwater moving equipment, a duckweed collecting mechanism and a recycling mechanism communicated with the duckweed collecting mechanism are arranged on the overwater moving equipment, and the device further comprises a fish avoiding mechanism arranged on the duckweed collecting mechanism; the duckweed collecting mechanism comprises a duckweed collecting suction head; the fish avoiding mechanism comprises a protective net arranged at the adsorption end of the duckweed collecting suction head, a hollow base arranged on one side of the protective net at intervals and located on the outer side of the duckweed collecting suction head, a flexible rope arranged on the outer wall of the circumference of the hollow base, and a driving mechanism used for driving the hollow base to rotate. Fish can be prevented from being sucked into the duckweed collecting suction head through the protective net on the duckweed collecting suction head, meanwhile, the driving mechanism drives the hollow base to enable the flexible rope to move, the flexible rope moves to disturb water flow, on one hand, the fish is driven to be away from the area of the duckweed collecting suction head, and on the other hand, a certain smashing effect on duckweed entering the protective net is achieved; and the protection net is effectively prevented from being blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of lake duckweed treatment, and specifically to an environment-friendly device for treating and recycling duckweed on the surface of lakes. Background Technique

[0002] In recent years, with the increasing problem of water eutrophication, the explosive proliferation of duckweed in lakes has become a global environmental problem. The excessive coverage of duckweed on the water surface will hinder the transmission of sunlight, leading to the death of submerged plants and a sudden drop in dissolved oxygen, and then triggering the collapse of the aquatic ecosystem. Currently, duckweed on the surface of lakes is usually treated by pumping it out with equipment. However, this method has the following defects:

[0003] 1. Although duckweed can be pumped out, there are still fish in the lake. When pumping out duckweed, it is easy to pump out fish, causing harm to the fish and destroying the biodiversity of the water area;

[0004] 2. The collected duckweed cannot be effectively recycled, which is easy to cause waste of resources and is not conducive to environmental protection.

[0005] Therefore, we propose an environment-friendly device for treating and recycling duckweed on the surface of lakes. Summary of the Invention

[0006] The purpose of the present invention is to provide an environment-friendly device for treating and recycling duckweed on the surface of lakes to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] An environment-friendly device for treating and recycling duckweed on the surface of lakes includes an aquatic mobile device. The aquatic mobile device is provided with a duckweed collection mechanism for collecting duckweed on the surface of the lake, and a recycling mechanism connected to the duckweed collection mechanism and used to make duckweed into feed for fish to eat. It also includes a fish avoidance mechanism provided on the duckweed collection mechanism;

[0009] The duckweed collection mechanism includes a duckweed collection suction head; the fish avoidance mechanism includes a protective net provided at the adsorption end of the duckweed collection suction head, a hollow seat spaced on one side of the protective net and located outside the duckweed collection suction head, a flexible rope provided on the circumferential outer wall of the hollow seat, and a driving mechanism for driving the hollow seat to rotate.

[0010] Further improvement lies in that the duckweed collection mechanism further includes a lifting bracket connecting the duckweed collection suction head and the aquatic mobile device, a suction device provided on the aquatic mobile device, and a connecting pipeline connecting the duckweed collection suction head and the suction device.

[0011] A further improvement lies in that the reuse mechanism includes a processing device arranged on the water mobile device for making duckweed into feed pellets, a duckweed filtering and processing device arranged on the pipeline between the processing device and the duckweed collection mechanism, and a storage device communicating with the processing device.

[0012] A further improvement lies in that the driving mechanism includes a hollow shaft communicating with the hollow seat and passing through the duckweed collection suction head and the protective net, a regulating liquid supply device arranged on the duckweed collection suction head for supplying duckweed-inhibiting material, and a rotating device arranged on one side of the regulating liquid supply device and used for drivingly connecting with the hollow shaft. The discharging end of the regulating liquid supply device corresponds to the hollow shaft. A liquid control member is arranged between the discharging end of the regulating liquid supply device and the hollow shaft, and the liquid control member is sleeved on the output end of the rotating device. The rotating device drives the liquid control member to rotate so that the discharging end of the regulating liquid supply device and the hollow shaft are intermittently communicated. An liquid outlet is arranged on the outer wall of the hollow seat.

[0013] A further improvement lies in that the liquid control member includes a liquid control disc sleeved on the output end of the rotating device. A plurality of groups of through holes for communicating the discharging end of the regulating liquid supply device and the hollow shaft are arranged on the liquid control disc in an annular array, and a sealing block for closing the through holes is detachably arranged in the through holes.

[0014] A further improvement lies in that the fish avoidance mechanism further includes a circulation box arranged at one end of the water mobile device. A pipeline for connecting the input end of the suction device and the discharging end and the feeding end communicating with the pipeline are respectively arranged on the circulation box. The bottom of the circulation box is hollow and is closed by a first sealing door. A second sealing door for closing the discharging end is arranged in the circulation box. The first sealing door and the second sealing door are driven to work by a transmission device. When the first sealing door closes the bottom of the circulation box, the second sealing door opens. An image acquisition device is arranged in the circulation box. The image acquisition device is used for acquiring image data in the circulation box and sending it to an analysis device for analysis. When fish are analyzed in the image data, the transmission device is made to work to drive the first sealing door to open and the second sealing door to close.

[0015] A further improvement lies in that the transmission device includes an electric guide rail member arranged on the water mobile device and used for driving the first sealing door to move horizontally, a pull rope connecting the first sealing door and the second sealing door, a roller shaft arranged on the water mobile device and used for restricting the moving direction of the pull rope, and an elastic member connecting the second sealing door and the circulation box. When the electric guide rail member drives the first sealing door to open, the second sealing door moves under the action of the pull rope and the elastic member to close the discharging end.

[0016] A further improvement lies in that the storage device is communicated with a discharging pipe. The discharging pipe extends to the outside of one end of the water mobile device far from the duckweed collection mechanism and is communicated with a placing cylinder through a telescopic pipe. Through holes are arranged on the outer wall of the placing cylinder. The discharging pipe and the placing cylinder are connected by a second telescopic device. An ultrasonic fish attractor is arranged on the placing cylinder.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1) The present invention is provided with a fish avoidance mechanism. The protective net on the duckweed collecting head can prevent fish from being sucked into the duckweed collecting head. At the same time, the driving mechanism drives the hollow seat to make the flexible rope move. The movement of the flexible rope disturbs the water flow. On the one hand, sound waves and vibrations are formed through the water flow fluctuations to drive fish away from the area of the duckweed collecting head. On the other hand, it also plays a certain role in breaking up the duckweed entering the protective net, effectively preventing the protective net from being blocked, facilitating the subsequent reuse of duckweed, and the flexible rope effectively prevents excessive harm to fish when contacting with fish;

[0019] 2) The present invention is provided with a reuse mechanism, which can make the extracted duckweed into ecological duckweed feed pellets that can be used to feed fish in the lake. It not only improves the utilization rate of duckweed resources, effectively reduces the water quality deterioration problem caused by excessive duckweed reproduction, but also helps the growth of fish in the lake, has high environmental protection, and attracts fish by putting feed pellets into the placement cylinder and combining with an ultrasonic fish attractor, reducing the fish existing in the area of the duckweed collection mechanism, thereby reducing the situation of fish being adsorbed at the duckweed collection mechanism. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the device of the present invention;

[0021] Figure 2 is of the present invention Figure 1 Another perspective schematic diagram of the structure

[0022] Figure 3 is a schematic structural diagram of the duckweed collection mechanism of the present invention;

[0023] Figure 4 is a schematic structural diagram of the circulation box of the present invention;

[0024] Figure 5 is of the present invention Figure 4 Cross-sectional view of the structure in;

[0025] Figure 6 is a schematic structural diagram of the placement cylinder of the present invention.

[0026] In the figure: 1. Waterborne mobile device; 2. Duckweed collection mechanism; 21. Lifting bracket; 22. Duckweed collection suction head; 23. Suction equipment; 24. Connecting pipeline; 3. Reuse mechanism; 31. Processing equipment; 32. Telescopic pipe; 33. Duckweed filtering and processing equipment; 34. Storage equipment; 35. Second telescopic equipment; 36. Placing cylinder; 37. Ultrasonic fish attractor; 4. Fish avoidance mechanism; 41. Protection net; 42. Regulating liquid supply equipment; 43. Hollow seat; 44. Flexible rope; 45. Liquid outlet; 46. Rotating equipment; 47. Liquid control plate; 48. Sealing block; 49. Circulation box; 410. Image acquisition equipment; 411. First sealing door; 412. Second sealing door; 413. Electric guide rail component; 414. Pulling rope. Detailed implementation manners

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1

[0029] Please refer to the attached Figures 1-3 , an environment-friendly duckweed treatment and reuse device for lake water surface, including a waterborne mobile device 1, which can be an electric unmanned boat or a small motorized hull; a duckweed collection mechanism 2 for collecting duckweed on the lake water surface is provided on the waterborne mobile device 1, and a reuse mechanism 3 that is connected to the duckweed collection mechanism 2 and is used to make duckweed into feed for fish in the lake is also included. A fish avoidance mechanism 4 is provided on the duckweed collection mechanism 2, which effectively avoids fish in the lake water body during the collection process and ensures the stability and safety of the lake ecosystem;

[0030] The duckweed collection mechanism 2 includes a duckweed collection suction head 22 with a flared opening at the front end to facilitate expanding the collection range. To prevent fish from being sucked into the system and causing harm, the fish avoidance mechanism 4 includes a protective net 41 provided at the adsorption end of the duckweed collection suction head 22. The protective net 41 has a certain pore size design, which can effectively block fish from entering while not affecting the normal suction of duckweed. The size of duckweed is usually 2 - 10 mm. Therefore, the pore size of the protective net 41 can be preferably 12 - 15 mm. A hollow seat 43 is provided on one side of the protective net 41 and outside the duckweed collection suction head 22. A flexible rope 44 is provided on the circumferential outer wall of the hollow seat 43, and a driving mechanism for driving the hollow seat 43 to rotate. The driving mechanism is used to drive the hollow seat 43 to rotate, and then the hollow seat 43 drives the flexible rope 44 to disturb the water flow. Further, to ensure that the flexible rope 44 rotates with the hollow seat 43, a rubber spherical block with a certain weight can be provided at the end of the flexible rope 44. By the movement of the flexible rope 44 disturbing the water flow, on the one hand, sound waves and vibrations are formed through the water flow fluctuations to drive fish away from the area of the duckweed collection suction head 22. On the other hand, it also plays a certain role in crushing the duckweed entering the protective net 41, effectively preventing the protective net 41 from being blocked and facilitating the subsequent reuse of duckweed. And using the flexible rope 44 effectively prevents excessive harm to fish when contacting fish. The above flexible rope 44 can be made of materials such as nylon or polyethylene / polypropylene, etc., which will not be elaborated here.

[0031] Preferably, the duckweed collection mechanism 2 of this embodiment further includes a lifting bracket 21 (such as a hydraulic lifting bracket or an electric lifting rod, etc.) connecting the duckweed collection suction head 22 and the waterborne mobile device 1, a suction device 23 (such as a centrifugal pump) provided on the waterborne mobile device 1, and a connecting pipeline 24 connecting the duckweed collection suction head 22 and the suction device 23. The lifting bracket 21 facilitates driving the duckweed collection suction head 22 to enter the lake to collect duckweed or retracting the duckweed collection suction head 22 upward.

[0032] Preferably, the reuse mechanism 3 of this embodiment includes a processing device 31 provided on the waterborne mobile device 1 for making duckweed into feed pellets, a duckweed filtering and processing device 33 on the pipeline between the processing device 31 and the duckweed collection mechanism 2, and a storage device 34 communicating with the processing device 31;

[0033] The above-mentioned processing device 31 includes a crushing device for crushing duckweed, a drying device for drying the crushed duckweed, a stirring device for mixing the dried duckweed with additives (such as traditional feed soybean meal, corn, wheat bran, etc. or nutritional additives such as microbial agents, protein supplements, etc.) to form a mixed material, and a granulating device for making the mixed material into pellets, etc. The above-mentioned duckweed filtering and processing device 33 is used to separate the incoming duckweed and water. It should be noted that the separated duckweed enters the processing device 31, and the separated water is discharged back into the lake. The storage device 34 is a storage box.

[0034] The collected duckweed is effectively utilized by the processing device 31, the duckweed treatment device 33 and the storage device 34, so that the duckweed shells are made into ecological duckweed feed pellets that can be used to feed fish in the lake. This not only improves the utilization rate of duckweed resources, effectively reduces the problem of water quality deterioration caused by excessive duckweed reproduction, but also helps the growth of fish in the lake, avoids waste of resources, and has high environmental protection.

[0035] Example 2

[0036] Please refer to the attached Figures 3-6 , on the basis of Example 1, the drive mechanism of this embodiment includes a hollow shaft that communicates with the hollow seat 43 and penetrates through the duckweed collecting suction head 22 and the protective net 41, a regulating liquid supply device 42 (composed of a liquid storage tank, a pump, etc.) provided on the duckweed collecting suction head 22 for supplying the duckweed inhibiting material, and a rotating device 46 (such as a motor) provided on one side of the regulating liquid supply device 42 and used for drivingly connecting with the hollow shaft. The above-mentioned duckweed inhibiting material is, for example, a biological inhibitor or a microorganism (such as Bacillus, Nitrobacter, EM bacteria). The duckweed inhibiting material can effectively inhibit the regrowth of duckweed, and the duckweed inhibiting material will not cause harm to the fish in the lake. The discharge end of the regulating liquid supply device 42 corresponds to the hollow shaft. A liquid control member is provided between the discharge end of the regulating liquid supply device 42 and the hollow shaft, and the liquid control member is sleeved on the output end of the rotating device 46. The rotating device 46 drives the rotation to intermittently connect the discharge end of the regulating liquid supply device 42 and the hollow shaft. The outer wall of the hollow seat 43 is provided with a liquid outlet 45. The discharge end of the above-mentioned regulating liquid supply device 42 has an electromagnetic valve to control whether to inject the duckweed inhibiting material into the lake. When the electromagnetic valve is opened, the discharge end of the regulating liquid supply device 42 and the hollow shaft are intermittently connected, and the duckweed inhibiting material intermittently passes through the liquid outlet 45 and enters the water body under the action of the centrifugal force of the hollow seat 43, inhibiting the regrowth of duckweed while maintaining the ecological balance of the lake. The output end of the above-mentioned rotating device 46 and the hollow shaft are, for example, drivingly connected by a gear set (two meshing gears). The liquid control member is used to quantitatively add the duckweed inhibiting material to reduce waste in use.

[0037] Preferably, the liquid control member of this embodiment includes a liquid control disk 47 sleeved on the output end of the rotating device 46. A plurality of groups of through holes for connecting the discharge end of the regulating liquid supply device 42 and the hollow shaft are arranged on the liquid control disk 47 in an annular array, and a sealing block 48 for closing the through hole is detachably arranged in the through hole. When the sealing block 48 is in the through hole, the top of the sealing block 48 is flush with the top of the liquid control disk 47. By removing the sealing blocks 48 at different positions or in different quantities to expose the through holes, the time for supplying the inhibiting material can be regulated. This method does not require adjusting the rotation speed of the rotating device 46, ensuring the stable rotation of the flexible rope 44 to drive the fish and break the duckweed.

[0038] Example 3

[0039] Please refer to the appendix Figures 4-5 Based on Embodiment 1, the fish avoidance mechanism 4 of this embodiment further includes a circulation box 49 provided at one end of the water mobile device 1. The circulation box 49 is respectively provided with a pipeline for connecting the input end of the suction device 23 and the liquid outlet end and the liquid inlet end communicating with the pipeline 24. The liquid outlet end is opened at the top of the circulation box 49, and the liquid inlet end is opened at the side wall of the circulation box 49. The bottom of the circulation box 49 is hollow and is closed by a first sealing door 411. Preferably, there are two groups of the first sealing doors 411. A second sealing door 412 for closing the liquid outlet end is provided in the circulation box 49. One end of the second sealing door 412 penetrates the side wall of the circulation box 49. Preferably, there are also two groups of the second sealing doors 412. The first sealing door 411 and the second sealing door 412 are driven to work by a transmission device. When the first sealing door 411 closes the bottom of the circulation box 49, the second sealing door 412 opens. An image acquisition device 410 is provided in the circulation box 49. The image acquisition device 410 is, for example, an underwater camera. The image acquisition device 410 is used to acquire the image data in the circulation box 49 and send it to an analysis device for analysis. When it is analyzed that the image data contains fish, the transmission device is made to work to drive the first sealing door 411 to open and the second sealing door 412 to close;

[0040] The above-mentioned analysis device includes, for example, an analysis module, a database storing fish image data, a controller, etc. When fish are accidentally sucked in (some fish are too small and may be sucked in), the fish, duckweed, and water flow into the circulation box 49 through the communicating pipeline 24. When flowing in the circulation box 49, the image acquisition device 410 acquires image data in real time and sends the image data to the analysis module. The analysis module compares and analyzes the image data with the fish image data in the database. If it is determined that the image data contains fish, the controller controls the transmission device to work. Then, the first sealing door 411 opens and the second sealing door 412 closes, so that the fish, duckweed, and water that enter the circulation box 49 are discharged from the bottom of the circulation box 49 and re-enter the lake, and cannot enter the liquid outlet end to be sucked by the suction device 23, preventing the fish from being harmed.

[0041] Preferably, the transmission device in this embodiment includes an electric guide member 413 (such as a guide rail, a slider, and a device for driving the slider to move) provided on the water mobile device 1 and used to drive the first sealing door 411 to move horizontally. If there are two sets of the first sealing doors 411, the two sets of the first sealing doors 411 can be controlled by the electric guide member 413 to move closer to each other to close or move away from each other to open. A pull rope 414 connecting the first sealing door 411 and the second sealing door 412, a roller shaft provided on the water mobile device 1 and used to limit the moving direction of the pull rope 414, which is used to make the first sealing door 411 and the second sealing door 412 move in opposite directions, and an elastic member (such as a spring) connecting the second sealing door 412 and the circulation box 49. When the electric guide member 413 drives the first sealing door 411 to open, the second sealing door 412 moves under the action of the pull rope 414 and the elastic member to close the liquid outlet end. When the first sealing door 411 opens, the pull rope 414 is slack, and then the elastic member drives the second sealing door 412 to reset and move to close the liquid outlet end. When the first sealing door 411 closes, it pulls the second sealing door 412 to move outward and open through the pull rope 414.

[0042] Embodiment 4

[0043] Please refer to the attached Figure 6 , on the basis of Embodiment 1, the storage device 34 in this embodiment is communicated with a discharge pipe, and the discharge pipe is provided with an electromagnetic valve to facilitate controlling the opening and closing of the discharge of feed pellets in the storage device 34. The discharge pipe extends to the outside of one end of the water mobile device 1 away from the duckweed collection mechanism 2 and is communicated with a placement cylinder 36 through a telescopic pipe 32. Through holes are formed in the outer wall of the placement cylinder 36, and the aperture of the through holes can be smaller than the particle size of the feed pellets. The discharge pipe and the placement cylinder 36 are connected by a second telescopic device 35 (such as an electric telescopic rod, etc.). An ultrasonic fish attractor 37 is provided on the placement cylinder 36. The ultrasonic fish attractor 37 belongs to a conventional structure in the art. When removing duckweed, the device moves to the area where the duckweed is located through the water mobile device 1. By opening the electromagnetic valve, an appropriate amount of feed pellets can be discharged into the placement cylinder 36. At the same time, the second telescopic device 35 is used to drive the placement cylinder 36 to enter a specified depth in the lake, and then the ultrasonic fish attractor 37 is turned on to emit sound waves. The fish are attracted to gather around the placement cylinder 36 by the sound waves and the feed pellets and move synchronously with the water mobile device 1, reducing the number of fish in the area of the duckweed collection mechanism 2, thereby reducing the situation of fish being adsorbed at the duckweed collection mechanism 2.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly device for treating and recycling duckweed on the surface of lakes, comprising a waterborne mobile device (1), characterized in that: The water mobile device (1) is provided with a duckweed collection mechanism (2) for collecting duckweed on the lake surface, a recycling mechanism (3) connected to the duckweed collection mechanism (2) and used to make duckweed into feed for fish to eat, and a fish avoidance mechanism (4) provided on the duckweed collection mechanism (2). The duckweed collection mechanism (2) includes a duckweed collection suction head (22); the fish avoidance mechanism (4) includes a protective net (41) provided at the adsorption end of the duckweed collection suction head (22), a hollow seat (43) spaced on one side of the protective net (41) and located outside the duckweed collection suction head (22), a flexible rope (44) provided on the circumferential outer wall of the hollow seat (43), and a driving mechanism for driving the hollow seat (43) to rotate.

2. The device according to claim 1, characterized in that: The duckweed collection mechanism (2) further includes a lifting bracket (21) connecting the duckweed collection suction head (22) and the water mobile device (1), a suction device (23) provided on the water mobile device (1), and a connecting pipeline (24) connecting the duckweed collection suction head (22) and the suction device (23).

3. The device according to claim 1, characterized in that: The recycling mechanism (3) includes a processing device (31) provided on the water mobile device (1) for making duckweed into feed pellets, a duckweed filtering and processing device (33) provided on the pipeline between the processing device (31) and the duckweed collection mechanism (2), and a storage device (34) connected to the processing device (31).

4. The device according to claim 1, characterized in that: The driving mechanism includes a hollow shaft communicating with the hollow seat (43) and passing through the duckweed collection suction head (22) and the protective net (41), a regulating liquid supply device (42) provided on the duckweed collection suction head (22) for supplying duckweed-inhibiting material, and a rotating device (46) provided on one side of the regulating liquid supply device (42) and used for drivingly connecting with the hollow shaft. The discharge end of the regulating liquid supply device (42) corresponds to the hollow shaft. A liquid control member is provided between the discharge end of the regulating liquid supply device (42) and the hollow shaft, and the liquid control member is sleeved on the output end of the rotating device (46). The discharge end of the regulating liquid supply device (42) and the hollow shaft are intermittently communicated by being driven to rotate by the rotating device (46). The outer wall of the hollow seat (43) is provided with a liquid outlet (45).

5. The device according to claim 4, wherein: The liquid control member includes a liquid control disc (47) sleeved on the output end of the rotating device (46). A plurality of groups of through holes for communicating the discharge end of the regulating liquid supply device (42) and the hollow shaft are arranged on the liquid control disc (47) in an annular array, and sealing blocks (48) for closing the through holes are detachably provided in the through holes.

6. The device according to claim 2, wherein: The fish avoidance mechanism (4) further includes a circulation box (49) provided at one end of the water mobile device (1). The circulation box (49) is respectively provided with a pipeline for connecting the input end of the suction device (23), and the liquid outlet end and the liquid inlet end of the communication pipeline (24). The bottom of the circulation box (49) is hollow and is closed by a first sealing door (411). A second sealing door (412) for closing the liquid outlet end is provided in the circulation box (49). The first sealing door (411) and the second sealing door (412) are driven to work by a transmission device. When the first sealing door (411) closes the bottom of the circulation box (49), the second sealing door (412) opens. An image acquisition device (410) is provided in the circulation box (49). The image acquisition device (410) is used to acquire the image data in the circulation box (49) and send it to the analysis device for analysis. When it is analyzed that the image data contains fish, the transmission device is made to work to drive the first sealing door (411) to open and the second sealing door (412) to close.

7. The device according to claim 6, wherein: The transmission device includes an electric guide rail member (413) provided on the water mobile device (1) and used to drive the first sealing door (411) to move horizontally, a pull rope (414) connecting the first sealing door (411) and the second sealing door (412), a roller shaft provided on the water mobile device (1) and used to limit the moving direction of the pull rope (414), and an elastic member connecting the second sealing door (412) and the circulation box (49). When the electric guide rail member (413) drives the first sealing door (411) to open, the second sealing door (412) moves under the action of the pull rope (414) and the elastic member to close the liquid outlet end.

8. The device according to claim 3, characterized in that: The storage device (34) is communicated with a discharge pipe. The discharge pipe extends to the outside of one end of the water mobile device (1) away from the duckweed collection mechanism (2) and is communicated with a placement cylinder (36) through a telescopic pipe (32). Through holes are formed in the outer wall of the placement cylinder (36). The discharge pipe and the placement cylinder (36) are connected by a second telescopic device (35). An ultrasonic fish attractor (37) is provided on the placement cylinder (36).

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