System for collecting and treating plankton on water surface of fresh water basin

Abstract

The invention relates to the field of environmental governance, and discloses a fresh water basin water surface plankton collection and treatment system which comprises a sampling floating platform, two floating blocks are fixed to the bottom face of the sampling floating platform, a movable hole is formed in the top face of the sampling floating platform, and a filtering assembly is arranged on the sampling floating platform; the filter assembly comprises a movable plate which is movably arranged in the movable hole, a fixing hole is formed in the top surface of the movable plate, a sampling pipe is fixed in the fixing hole, a filter frame is detachably arranged in the filter box, a filter membrane is fixed in the filter frame, and the sampling pipe is connected with the filter frame. A conveying pipe is communicated and fixed between the filter box and the sampling pipe, and an electric pump is arranged on the conveying pipe. According to the invention, the filtering assembly is beneficial to timely filtering after the water sample is collected, so that degradation or morphological change of algae cells is avoided, and the integrity and representativeness of the sample are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of environmental governance and forensic diatom research sample collection, and in particular to a system for collecting and processing plankton on the surface of a freshwater basin. Background Art

[0002] Plankton refers to drifting organisms that live in water and lack the ability to move effectively. They are divided into phytoplankton and zooplankton. Some plankton have the ability to swim, but their swimming speed is often slower than the speed of the ocean current in which they live, so they cannot swim flexibly in the water effectively. Among the organisms in waters such as oceans, lakes and rivers, plankton has no ability to move at all, or its ability is very weak, so it cannot move against the current, but floats on the water surface. This type of organism is generally called plankton, but when there are too many plankton on the water surface, it will pollute the water quality.

[0003] Among the plankton, phytoplankton, especially diatoms, have good application prospects in the field of forensic medicine. Diatom species and numbers in the water are consistent with those detected in the lungs and other organs of the body in the water, which can be used to diagnose drowning in the body. In addition, the suspected drowning location can be inferred based on the differences in diatom species in different watersheds. Therefore, collecting diatoms in the water has practical significance.

[0004] According to the Chinese patent with announcement number CN217850194U, a plankton collection net is provided with an internal filter screen in the net bag, the internal filter screen is formed by rolling the filter screen into a conical tube, and the conical bottom surface of the internal filter screen is opened; the annular inner side surface of the net mouth skeleton is provided with an annular step protrusion, and the annular step protrusion is integrally formed with the net mouth skeleton; the conical bottom surface edge of the internal filter screen is fitted to the upper end surface of the annular step protrusion and is fixedly connected to the annular step protrusion by bolts; the mesh number of the internal filter screen is smaller than the mesh number of the net bag.

[0005] In the above scheme, smaller phytoplankton passes through the internal filter and enters the net bag, while zooplankton such as fat arrow worms, medium-sized shrimps, broad-fronted false krill, and twin jellyfish are blocked by the internal filter, resulting in the following disadvantages: the water sample cannot be processed in time after collection, causing the algae cells to degrade or change in morphology, thereby reducing the integrity and representativeness of the sample. Summary of the invention

[0006] The purpose of the present invention is to provide a system for collecting and processing plankton on the surface of freshwater basins, so as to solve the problem that water samples cannot be processed in time after collection, so that the plankton community structure contained in the water samples changes or degrades with the passage of sampling time or sample transportation time; in addition, plankton of different particle sizes, especially phytoplankton, can be preliminarily screened to improve the sampling targeting and increase the sampling concentration of target organisms.

[0007] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: a system for collecting and processing plankton on the surface of a freshwater basin, comprising a sampling floating platform, two floating blocks are fixed on the bottom surface of the sampling floating platform, a movable hole is opened on the top surface of the sampling floating platform, a PLC controller is fixed on the top surface of the sampling floating platform, and a filtering component is arranged on the sampling floating platform;

[0008] The filter assembly includes a movable plate movably arranged in a movable hole, a fixing hole is opened on the top surface of the movable plate, a sampling tube is fixed inside the fixing hole, a filter box is fixed on the top surface of the sampling floating platform, a sealing cover is detachably provided on the top surface of the filter box, a filter frame is detachably provided inside the filter box, a filter membrane is fixed inside the filter frame, a delivery pipe is fixedly connected between the filter box and the sampling tube, an electric pump is provided on the delivery pipe, the electric pump is electrically connected to the PLC controller, a pressure regulating valve is provided on the delivery pipe, and the pressure regulating valve is electrically connected to the PLC controller.

[0009] Preferably, a collecting mechanism is provided on the rear side of the filter assembly, and the collecting mechanism includes a collecting box fixed on the sampling platform, a connecting pipe is connected and fixed between the collecting box and the filter box, a delivery pump is provided on the connecting pipe, and the delivery pump is electrically connected to the PLC controller.

[0010] Preferably, an adjustment mechanism is provided on the front side of the filtering mechanism, and the adjustment mechanism includes a support plate fixed on the inner wall of the movable hole, a connecting hole is provided on the top surface of the support plate, an electric push rod is fixed on the top surface of the support plate, the electric push rod is electrically connected to the PLC controller, one end of the telescopic rod of the electric push rod is fixedly connected to the top surface of the movable plate, a limiting hole is provided on the top surface of the support plate, a limiting column is slidably inserted into the inside of the limiting hole, and the bottom end of the limiting column is fixedly connected to the top surface of the movable plate.

[0011] Preferably, a detection mechanism is provided below the filtering mechanism, and the detection mechanism includes a water depth sensor fixed on the bottom surface of the sampling float, and the water depth sensor is electrically connected to the PLC controller. A temperature sensor is fixed on the bottom surface of the sampling float, and the temperature sensor is electrically connected to the PLC controller.

[0012] Preferably, a disassembly and assembly mechanism is provided above the filter mechanism, and the disassembly and assembly mechanism includes two threaded grooves opened on the filter box, and the top surface of the sealing cover is provided with two threaded holes, and bolts are respectively threadedly connected in the two threaded holes, and the threaded ends of the two bolts are respectively connected to the internal threads of the two threaded grooves, and slide grooves are respectively provided on the left and right sides of the inner wall of the filter box, and sliders are respectively fixed on the left and right sides of the outer wall of the filter frame, and the two sliders are respectively slidably arranged in the two slide grooves, and the inner bottom surfaces of the two slide grooves are respectively fixed with first magnets, and the bottom surfaces of the two sliders are respectively fixed with second magnets, and the two second magnets are respectively magnetically attracted to the two first magnets.

[0013] Preferably, a placement hole is opened on the top surface of the sealing cover, a vibration motor is fixed to the top surface of the sealing cover, a vibration frame is fixed to the output end of the vibration motor, and the bottom end of the vibration frame contacts the top surface of the filter frame.

[0014] Preferably, two fixed long rods are fixed to the rear side of the sampling platform, and fixed plates are respectively fixed to the rear ends of the two fixed long rods, and mounting holes are respectively opened on one side of the two fixed plates.

[0015] Preferably, a power supply mechanism is provided above the filtering mechanism, and the power supply mechanism includes a power box fixed on the sampling platform, and a battery is fixed inside the power box, and the battery is electrically connected to the PLC controller, electric pump, pressure regulating valve, delivery pump, electric push rod, water depth sensor, temperature sensor and vibration motor respectively.

[0016] Compared with the prior art, a system for collecting and treating plankton on the surface of a freshwater basin using the above technical solution has the following beneficial effects:

[0017] 1. During use, the staff sets up a sampling point every 20 kilometers along the selected river, starting from 5 km away from the estuary, to ensure full coverage of the study area. Each sampling point is greater than or equal to 1 meter away from the river bank. Then the sampling float is placed on the water surface, and the stability and buoyancy of the sampling float are ensured by two floating blocks fixed at its bottom. Then the depth of the sampling tube in the water is adjusted by the adjustment mechanism, and then the water sample is collected through the sampling tube. At the bottom of the sampling tube, due to the continuous delivery of the electric pump and the regulation of the pressure regulating valve, the water sample produces a certain rotation or accelerated flow, so that the water sample forms centrifugal force here, so that the collected water sample is enriched at the bottom of the sampling tube, and then the collected water sample is smoothly and efficiently transported to the inside of the filter box, and then the algae sample is filtered through the filter membrane inside the filter box, and then the filtered algae sample is collected by the collection mechanism. When it is necessary to filter algae of different sizes, the filter membrane can be disassembled and replaced by the disassembly and assembly mechanism, and the filter membrane with appropriate pore size can be replaced. The filtration component facilitates timely filtration of water samples after collection, avoiding changes in algae and plankton richness caused by prolonged sampling time and sample transportation, thereby ensuring the integrity and representativeness of the samples;

[0018] 2. During use, after the algae samples are filtered through the filter membrane, they will settle at the bottom of the filter box. At this time, the staff has already disinfected the collection box in advance to ensure the pollution-free storage of the samples. Then the PLC controller issues an instruction to start the delivery pump through remote control. The delivery pump delivers the filtered algae samples to the collection box through the connecting pipe for collection. The whole process is smooth and efficient, which shortens the sample processing time. The staff starts the electric push rod to adjust the height of the moving plate, which can then drive the sampling tube to adjust the height. When the water depth is greater than or equal to 1 meter, the electric push rod controls the sampling tube to collect at a depth of 0.5 meters. When the water depth is less than 1 meter, the water sample is collected at a depth of 1 / 2 of the water depth, achieving accurate sampling at different water depths, improving the accuracy and representativeness of the samples, and realizing automatic control of the height adjustment process, reducing the complexity and error of manual operation;

[0019] 3. In use, the water depth sensor and temperature sensor are used to detect the water depth and water temperature of the freshwater basin in real time, and accurately transmit the detection information to the PLC controller. The PLC controller intelligently adjusts the working status of the electric push rod, electric pump and pressure regulating valve through remote control according to the received information. For example, when the water depth changes, the PLC controller will immediately adjust the sampling depth of the sampling tube; when the water temperature changes, the working parameters of the electric pump and pressure regulating valve will be adjusted accordingly to ensure the stability and efficiency of the water sample collection and filtration process. When the filter membrane needs to be replaced, the staff only needs to unscrew the bolts to remove the sealing cover from the filter box, and then smoothly pull the filter frame out of the filter box to easily remove the old filter membrane, and then put the new or different sized filter membrane into the filter box, ensure that the slider is set in the slide slot, and fix it through the magnetic attraction of the first magnet and the second magnet, and finally fix the sealing cover to the filter box again by bolts to complete the replacement process of the filter membrane. The whole process is simple and fast, which reduces the complexity and time cost of replacing the filter membrane;

[0020] 4. During use, the staff uses the vibration motor to make the vibration frame produce slight vibrations. This vibration can drive the filter membrane to produce slight vibrations, thereby effectively preventing the filter membrane from being blocked by particulate matter, algae or other solid substances, thereby improving the filtration efficiency and ensuring the integrity and representativeness of the algae samples in the water sample. The use of a fixed long rod and a fixed plate is conducive to the staff to fix the sampling platform to the shore. This fixing method is not only simple and fast, but also ensures the accuracy and stability of the sampling point. During the sampling process, even if it encounters adverse factors such as water flow impact, the sampling platform can maintain a stable position, thereby ensuring the accuracy and representativeness of water sample collection. The use of a power box and a battery is conducive to providing a stable and reliable power supply support for the entire system, ensuring the continuous and stable operation of the entire system during the sampling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional schematic diagram of an embodiment;

[0022] Figure 2 An exploded schematic diagram of an embodiment;

[0023] Figure 3 is a cross-sectional schematic diagram of the sampling tube in the embodiment;

[0024] Figure 4 It is a cross-sectional schematic diagram of the filter box in the embodiment;

[0025] Figure 5 It is an exploded schematic diagram of the filter frame and the vibration frame in the embodiment;

[0026] Figure 6For example Figure 2 The enlarged schematic diagram at A in the middle;

[0027] Figure 7 For example Figure 2 Enlarged schematic diagram of point B in the middle.

[0028] In the figure: 1. sampling platform; 2. floating block; 3. movable hole; 4. movable plate; 5. fixed hole; 6. sampling tube; 7. filter box; 8. sealing cover; 9. filter frame; 10. filter membrane; 11. delivery pipe; 12. electric pump; 13. pressure regulating valve; 14. collecting box; 15. connecting pipe; 16. delivery pump; 17. supporting plate; 18. connecting hole; 19. electric push rod; 20. limiting hole; 21. limiting column; 22. water depth sensor; 23. temperature sensor; 24. threaded groove; 25. threaded hole; 26. bolt; 27. slide groove; 28. slider; 29. ​​first magnet; 30. second magnet; 31. placement hole; 32. vibration motor; 33. vibration frame; 34. fixed long rod; 35. fixed plate; 36. power box; 37. battery. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1-Figure 7 As shown, a system for collecting and treating plankton on the surface of a freshwater basin comprises a sampling platform 1, two floating blocks 2 are fixed on the bottom surface of the sampling platform 1, the sampling platform 1 is made of plastic, the floating blocks 2 are made of closed-cell foam material, a movable hole 3 is opened on the top surface of the sampling platform 1, a PLC controller is fixed on the top surface of the sampling platform 1, and a filtering component is provided on the sampling platform 1;

[0031] The filtering assembly includes a movable plate 4 movably arranged in the movable hole 3, the movable plate 4 is made of plastic, a fixing hole 5 is opened on the top surface of the movable plate 4, a sampling tube 6 is fixed inside the fixing hole 5, a filter box 7 is fixed on the top surface of the sampling floating platform 1, the filter box 7 is made of stainless steel, a sealing cover 8 is detachably provided on the top surface of the filter box 7, the sealing cover 8 is made of stainless steel, a filter frame 9 is detachably provided inside the filter box 7, the filter frame 9 is made of plastic, a filter membrane 10 is fixed inside the filter frame 9, a delivery pipe 11 is connected and fixed between the filter box 7 and the sampling tube 6, an electric pump 12 is provided on the delivery pipe 11, the electric pump 12 is electrically connected to the PLC controller, a pressure regulating valve 13 is provided on the delivery pipe 11, and the pressure regulating valve 13 is electrically connected to the PLC controller.

[0032] During use, the staff sets up a sampling point every 20 kilometers along the selected river, starting from 5 km away from the estuary, to ensure full coverage of the study area. Each sampling point is greater than or equal to 1 meter away from the river bank. Then the sampling platform 1 is placed on the water surface, and the stability and buoyancy of the sampling platform 1 are ensured by two floating blocks 2 fixed at its bottom. Then the depth of the sampling tube 6 in the water is adjusted by the adjustment mechanism, and then the water sample is collected through the sampling tube 6. At the bottom of the sampling tube 6, due to the continuous delivery of the electric pump 12 and the regulation of the pressure regulating valve 13, the water sample produces a certain rotation or accelerated flow, so that the water sample forms centrifugal force here, so that the collected water sample is enriched at the bottom of the sampling tube 6, and then the collected water sample is smoothly and efficiently transported to the inside of the filter box 7, and then the algae sample is filtered by the filter membrane 10 inside the filter box 7, and then the filtered algae sample is collected by the collection mechanism. When it is necessary to filter algae of different sizes, the filter membrane 10 can be disassembled and replaced by the disassembly mechanism, and the filter membrane 10 of the appropriate pore size can be replaced. The filtration component facilitates timely filtration of water samples after collection, avoiding changes in the richness of algae and plankton caused by extended sampling time and sample transportation, thereby ensuring the integrity and representativeness of the samples.

[0033] like Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, a collecting mechanism is provided on the rear side of the filter assembly, and the collecting mechanism includes a collecting box 14 fixed on the sampling platform 1. The collecting box 14 is made of polycarbonate. A connecting pipe 15 is fixedly connected between the collecting box 14 and the filter box 7. A delivery pump 16 is provided on the connecting pipe 15, and the delivery pump 16 is electrically connected to the PLC controller.

[0034] During use, after the algae samples are filtered through the filter membrane 10, they will be deposited at the bottom of the filter box 7. At this time, the staff has disinfected the collection box 14 in advance to ensure the pollution-free storage of the samples. Then the PLC controller issues an instruction to start the delivery pump 16 through remote control. The delivery pump 16 delivers the filtered algae samples to the collection box 14 for collection through the connecting pipe 15. The whole process is smooth and efficient, which shortens the processing time of the original water sample and facilitates downstream analysis and processing in the laboratory.

[0035] like Figure 1-Figure 7As shown, an adjustment mechanism is provided on the front side of the filtering mechanism, and the adjustment mechanism includes a support plate 17 fixed on the inner wall of the movable hole 3, the material of the support plate 17 is a plastic plate, and a connecting hole 18 is provided on the top surface of the support plate 17, and an electric push rod 19 is fixed on the top surface of the support plate 17, and the electric push rod 19 is electrically connected to the PLC controller, and one end of the telescopic rod of the electric push rod 19 is fixedly connected to the top surface of the movable plate 4, and a limiting hole 20 is provided on the top surface of the support plate 17, and a limiting column 21 is slidably inserted in the limiting hole 20, and the bottom end of the limiting column 21 is fixedly connected to the top surface of the movable plate 4, and a detection mechanism is provided below the filtering mechanism, and the detection mechanism includes a water depth sensor 22 fixed on the bottom surface of the sampling floating platform 1, and the water depth sensor 22 is electrically connected to the PLC controller, and a temperature sensor is fixed on the bottom surface of the sampling floating platform 1. Sensor 23, temperature sensor 23 is electrically connected to the PLC controller, a disassembly mechanism is provided above the filtering mechanism, the disassembly mechanism includes two threaded grooves 24 provided on the filter box 7, two threaded holes 25 are provided on the top surface of the sealing cover 8, bolts 26 are respectively threadedly connected in the two threaded holes 25, the threaded ends of the two bolts 26 are respectively threadedly connected with the internal threads of the two threaded grooves 24, slide grooves 27 are respectively provided on the left and right sides of the inner wall of the filter box 7, sliders 28 are respectively fixed on the left and right sides of the outer wall of the filter frame 9, the two sliders 28 are respectively slidably arranged in the two slide grooves 27, the inner bottom surfaces of the two slide grooves 27 are respectively fixed with first magnets 29, the bottom surfaces of the two sliders 28 are respectively fixed with second magnets 30, and the two second magnets 30 are respectively magnetically attracted to the two first magnets 29.

[0036] In use, the staff starts the electric push rod 19 to adjust the height of the movable plate 4, which can drive the sampling tube 6 to adjust the height. When the water depth is greater than or equal to 1 meter, the electric push rod 19 controls the sampling tube 6 to collect water at a depth of 0.5 meters. When the water depth is less than 1 meter, the water sample is collected at a depth of 1 / 2 of the water depth, achieving accurate sampling at different water depths, improving the accuracy and representativeness of the sample, and realizing automatic control of the height adjustment process, reducing the complexity and error of manual operation. The water depth sensor 22 and the temperature sensor 23 are used to detect the water depth and water temperature of the freshwater basin in real time, and accurately transmit the detection information to the PLC controller. The PLC controller intelligently adjusts the working state of the electric push rod 19, the electric pump 12 and the pressure regulating valve 13 through remote control according to the received information. For example, when the water depth changes, the PLC controller will immediately adjust the collection depth of the sampling tube 6; when the water temperature changes, the working parameters of the electric pump 12 and the pressure regulating valve 13 will be adjusted accordingly to ensure the stability and efficiency of the water sample collection and filtration process. When the filter membrane 10 needs to be replaced, the staff only needs to unscrew the bolts 26 to remove the sealing cover 8 from the filter box 7, and then smoothly pull the filter frame 9 out of the filter box 7 to easily remove the old filter membrane 10, and then put the new or filter membrane 10 with different filter holes into the filter box 7, ensure that the slider 28 is slidably set in the slide groove 27, and is fixed by the magnetic attraction of the first magnet 29 and the second magnet 30, and finally fix the sealing cover 8 to the filter box 7 again by the bolts 26 to complete the replacement process of the filter membrane 10. The whole process is simple and quick, which reduces the complexity and time cost of replacing the filter membrane 10.

[0037] like Figure 1-Figure 7 As shown, a placement hole 31 is provided on the top surface of the sealing cover 8, a vibration motor 32 is fixed on the top surface of the sealing cover 8, a vibration frame 33 is fixed on the output end of the vibration motor 32, the vibration frame 33 is made of light alloy, and the bottom end of the vibration frame 33 is in contact with the top surface of the filter frame 9, two fixed long rods 34 are fixed on the rear side of the sampling float 1, the fixed long rods 34 are made of plastic, and the rear ends of the two fixed long rods 34 are respectively fixed with fixed plates 35, the material of the fixed plates 35 is plastic, and one side of the two fixed plates 35 is respectively provided with mounting holes, and a power supply mechanism is provided above the filtering mechanism, the power supply mechanism includes a power box 36 fixed on the sampling float 1, and a battery 37 is fixed inside the power box 36, and the battery 37 is electrically connected to the PLC controller, the electric pump 12, the pressure regulating valve 13, the delivery pump 16, the electric push rod 19, the water depth sensor 22, the temperature sensor 23 and the vibration motor 32 respectively.

[0038] During use, the staff uses the vibration motor 32 to make the vibration frame 33 vibrate slightly. This vibration can drive the filter membrane 10 to vibrate slightly, thereby effectively preventing the filter membrane 10 from being blocked by particulate matter, large-size algae or other solid matter, thereby improving the filtration efficiency and ensuring the high abundance of algae samples in the water sample. By using the fixed long rod 34 and the fixed plate 35 in conjunction with each other, it is convenient for the staff to fix the sampling platform 1 to the shore. This fixing method is not only simple and fast, but also ensures the accuracy and stability of the sampling point. During the sampling process, even if it encounters adverse factors such as water flow impact, the sampling platform 1 can maintain a stable position, thereby ensuring the accuracy and representativeness of water sample collection. By using the power box 36 and the battery 37 in conjunction with each other, it is convenient to provide a stable and reliable power supply support for the entire system, ensuring the continuous and stable operation of the entire system during the sampling process.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for collecting and processing plankton on the surface of a freshwater basin, comprising a sampling platform (1), characterized in that: Two floating blocks (2) are fixed on the bottom surface of the sampling floating platform (1), a movable hole (3) is opened on the top surface of the sampling floating platform (1), a PLC controller is fixed on the top surface of the sampling floating platform (1), and a filtering component is provided on the sampling floating platform (1); The filter assembly comprises a movable plate (4) movably arranged in the movable hole (3), the top surface of the movable plate (4) is provided with a fixing hole (5), a sampling tube (6) is fixed inside the fixing hole (5), a filter box (7) is fixed on the top surface of the sampling platform (1), a sealing cover (8) is detachably provided on the top surface of the filter box (7), a filter frame (9) is detachably provided inside the filter box (7), a filter membrane (10) is fixed inside the filter frame (9), a delivery pipe (11) is fixedly connected between the filter box (7) and the sampling tube (6), an electric pump (12) is provided on the delivery pipe (11), the electric pump (12) is electrically connected to a PLC controller, a pressure regulating valve (13) is provided on the delivery pipe (11), and the pressure regulating valve (13) is electrically connected to the PLC controller.

2. A system for collecting and treating plankton on the surface of a freshwater basin according to claim 1, characterized in that: A collecting mechanism is provided on the rear side of the filter assembly, the collecting mechanism comprising a collecting box (14) fixed on the sampling platform (1), a connecting pipe (15) is connected and fixed between the collecting box (14) and the filter box (7), a delivery pump (16) is provided on the connecting pipe (15), and the delivery pump (16) is electrically connected to the PLC controller.

3. A system for collecting and treating plankton on the surface of freshwater basins according to claim 2, characterized in that: An adjustment mechanism is provided on the front side of the filtering mechanism, and the adjustment mechanism comprises a support plate (17) fixed on the inner wall of the movable hole (3), a connection hole (18) is provided on the top surface of the support plate (17), an electric push rod (19) is fixed on the top surface of the support plate (17), the electric push rod (19) is electrically connected to the PLC controller, one end of the telescopic rod of the electric push rod (19) is fixedly connected to the top surface of the movable plate (4), a limiting hole (20) is provided on the top surface of the support plate (17), a limiting column (21) is slidably inserted in the inside of the limiting hole (20), and the bottom end of the limiting column (21) is fixedly connected to the top surface of the movable plate (4).

4. A system for collecting and treating plankton on the surface of freshwater basins according to claim 3, characterized in that: A detection mechanism is provided below the filtering mechanism, the detection mechanism comprising a water depth sensor (22) fixed to the bottom surface of the sampling platform (1), the water depth sensor (22) being electrically connected to a PLC controller, and a temperature sensor (23) being fixed to the bottom surface of the sampling platform (1), the temperature sensor (23) being electrically connected to the PLC controller.

5. A system for collecting and treating plankton on the surface of freshwater basins according to claim 4, characterized in that: A disassembly mechanism is provided above the filter mechanism, the disassembly mechanism comprising two threaded grooves (24) provided on the filter box (7), two threaded holes (25) provided on the top surface of the sealing cover (8), bolts (26) being threadedly connected in the two threaded holes (25), the threaded ends of the two bolts (26) being threadedly connected in the two threaded grooves (24), a slide groove (27) being provided on the left and right sides of the inner wall of the filter box (7), a slider (28) being fixed on the left and right sides of the outer wall of the filter frame (9), the two sliders (28) being slidably arranged in the two slide grooves (27), the inner bottom surfaces of the two slide grooves (27) being fixed with first magnets (29), the bottom surfaces of the two sliders (28) being fixed with second magnets (30), the two second magnets (30) being magnetically attracted to the two first magnets (29) respectively.

6. A system for collecting and treating plankton on the surface of freshwater basins according to claim 5, characterized in that: The top surface of the sealing cover (8) is provided with a placement hole (31), a vibration motor (32) is fixed to the top surface of the sealing cover (8), a vibration frame (33) is fixed to the output end of the vibration motor (32), and the bottom end of the vibration frame (33) is in contact with the top surface of the filter frame (9).

7. A system for collecting and treating plankton on the surface of freshwater basins according to claim 1, characterized in that: Two fixed long rods (34) are fixed to the rear side of the sampling floating platform (1), and fixed plates (35) are respectively fixed to the rear ends of the two fixed long rods (34), and mounting holes are respectively opened on one side of the two fixed plates (35).

8. A system for collecting and treating plankton on the surface of freshwater basins according to claim 7, characterized in that: A power supply mechanism is provided above the filtering mechanism, the power supply mechanism comprising a power supply box (36) fixed on the sampling platform (1), a storage battery (37) fixed inside the power supply box (36), and the storage battery (37) is electrically connected to a PLC controller, an electric pump (12), a pressure regulating valve (13), a delivery pump (16), an electric push rod (19), a water depth sensor (22), a temperature sensor (23) and a vibration motor (32) respectively.

Images