Automatic water quality sampler for sampling micro-plastic sediments in lake water body

Abstract

The invention discloses an automatic water sampler for sampling micro-plastic sediments in lake water, which comprises a floating roof, a balancing weight is arranged below the floating roof, the upper end of the balancing weight is fixedly connected with an upper disc, the lower end of the balancing weight is fixedly connected with a lower disc, a plurality of rack columns are arranged outside the balancing weight, the upper part of each rack column is connected with a water sampling pipe, and the water sampling pipes are inserted into the upper disc. The lower portion of each rack column is connected with a sediment collecting pipe, the sediment collecting pipes are arranged below the lower disc, the rack columns are vertically connected to the lower disc in a sliding mode, the lower disc is further provided with a sampling gear, and the sampling gear can move on the lower disc to be meshed with the rack columns; through the arrangement of the floating roof, the device floats at sampling points for a long time, and the motor controls the movement of the rack column to realize sampling at different time points, so that researchers do not need to repeatedly go back and forth between the sampling points, and high-load physical output caused by frequent going back and forth of different sampling points by the researchers is avoided; and the time consumed by commuting between the sampling points is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of lake water treatment sampling, and specifically to an automatic water sampler for collecting microplastic sediments in lake water bodies. Background Art

[0002] Microplastics can be found in rivers, lakes, reservoirs, oceans and many other places. The harm caused by microplastic pollution in lakes to the environment is jointly affected by its abundance, size, shape and composition. There are significant differences in the distribution and abundance of microplastics in lakes during the ice-bound period and the non-ice-bound period, and the ice body will accumulate more microplastics during the ice-bound period. Against this background, it is necessary to study the sampling and detection of the abundance, size, shape and composition of microplastics in ice, water and sediments at different times and different periods.

[0003] According to the water environment and lake wetland investigation specifications of our country, and considering the distribution of the sewage outlets into the lake and the hydrodynamic characteristics of the actual lake (Wuliangsuhai), the lake is square-grid divided in space at a scale of 2 km × 2 km, and sample collection points are set at the intersection points of the square grids; the impact of plastic components in different periods on organisms in the environment is different, and different constituent monomers make the toxicity of different plastics different, and the possible harm to organisms is also different. Based on this, water samples are collected in a periodic manner at the collection points (for example, sampling 10 - 16 times at different time periods within 36 hours).

[0004] Currently, the sampling method during the non-ice-bound period is to regularly take a boat to the designated collection points, and rely on manual collection of water and underwater sediment samples. To observe the variation law of the microplastic concentration at a specific sampling point over time, researchers need to conduct periodic repeated sampling at this point. This requires researchers to frequently travel between different sampling points, which consumes a large amount of time and energy for the commuting process between sampling points, increases the labor intensity, and also affects the sampling efficiency and the progress of subsequent research work.

[0005] For periodic repeated sampling at the designated collection points, water collection and sediment collection cannot be completed simultaneously, and high-efficiency collection cannot be achieved. At the same time, it is necessary to consider that the equipment should be small and compact for convenient transportation and underwater layout work. Summary of the Invention

[0006] The purpose of the present invention is to provide an automatic water sampler for collecting microplastic sediments in lake water bodies to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: An automatic water sampler for collecting microplastic sediments in lake water bodies, including a floating top, and further including a sampling assembly equipped with a number of rack columns. A water sampling tube is detachably connected above each rack column, and a sediment sampling tube is detachably connected below. The water sampling tube is inserted on the upper plate, and the sediment sampling tube is located below the lower plate. The upper plate and the lower plate are fixedly connected. The rack columns are vertically slidably connected to the lower plate. A sampling gear is further provided on the lower plate, which can move along the circumferential line of the lower plate and can mesh with each rack column; the sampling gear drives the rack columns to move along their axial directions through the drive of a motor. The sampling gear is connected to the lower plate through an intermittent rotation assembly. The intermittent rotation assembly includes a toggle plate with guide bars arranged on the outer circle and an intermittent wheel with a number of intermittent shafts. The sampling gear is coaxially installed with the toggle plate. After the toggle plate rotates one circle, the guide bars on it contact and toggle the intermittent shafts, so that the intermittent wheel drives the rotating gear coaxially connected to it to move on the ring gear. The ring gear is fixedly connected to the lower plate. The intermittent rotation assembly is installed on a horizontal seat, and the horizontal seat is always slidably connected to the lower plate. The rotating gear moves on the ring gear to move the sampling gear to the next rack column.

[0008] Preferably, a limit block is fixedly connected under the horizontal seat, and the limit block is also slidably connected in a limit groove. The limit groove is annular and is provided on the lower plate. The intermittent wheel and the toggle plate are rotatably connected in a support box, and the support box is fixedly connected to the horizontal seat. The motor for driving the sampling gear is fixed on the horizontal seat.

[0009] Preferably, a winding shaft is rotatably connected in the floating top. The winding shaft is driven by a motor. One end of a chain is fixedly connected to the winding shaft, and the other end of the chain is fixedly connected to a clamping block. The chain can be wound around the winding shaft, and the clamping block is fixedly connected to the upper plate.

[0010] Preferably, the clamping block is frustum-shaped, and a groove with a corresponding shape is provided inside the floating top. The clamping block can be inserted into the floating top.

[0011] Preferably, a number of round holes are provided on the upper plate, and permanent magnets are embedded around the round holes.

[0012] Preferably, a water sampling tube limit piece is fixedly connected to the upper end of the water sampling tube. The diameter of the water sampling tube limit piece is larger than the round holes on the upper plate, and permanent magnets are also embedded on the water sampling tube limit piece. A piston is slidably connected in the water sampling tube. The piston is fixedly connected to the upper end of a pull rod. The lower end of the pull rod is rotatably connected to a nut. The nut is threadedly connected to the upper end of a water sampling tube connecting rod. The lower end of the water sampling tube connecting rod is fixedly connected to the rack column.

[0013] Preferably, the sediment sampling tube is hollow, with its upper end inserted into the upper cap. The middle part of the hoop is fixedly connected under the upper cap. One end of the hoop is always rotatably connected to the hoop bolt, and the other end of the hoop slides horizontally on the hoop bolt. The hoop bolt is threadedly connected to the hoop nut, and the hoop clamps the sediment sampling tube. The upper cap is fixedly connected to the lower end of the sediment sampling tube connecting rod, and the upper end of the sediment sampling tube connecting rod is fixedly connected to the rack column.

[0014] Preferably, check valves are provided on both the water sampling tube and the upper cap.

[0015] Preferably, the middle parts of the upper disc and the lower disc are connected by a counterweight.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: With the floating top provided in the present invention, the device floats on the sampling point for a long time, and the movement of the rack column is controlled by the motor to achieve sampling at different time points. Thus, it is not necessary for researchers to repeatedly travel back and forth between the sampling points, significantly reducing the physical labor intensity during the sampling process and avoiding the high-load physical consumption of researchers due to frequent travel between different sampling points; reducing the time consumed for commuting between sampling points, enabling researchers to concentrate more time on core research work.

[0017] In the present invention, the water sampling tube and the sediment sampling tube are respectively installed at the upper and lower ends of the rack column, forming a rod-like form. By the downward movement of the rack column, the functions of synchronously driving the water sampling tube to pump water for sampling and the sediment sampling tube to sink for sediment sampling are achieved. The synchronous completion of water sampling and sediment sampling further improves the collection efficiency. At the same time, the rod-like form makes the equipment compact, facilitating transportation and underwater layout work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the main structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of a single water sampling tube, sediment sampling tube and rack column of the present invention; Figure 3 is the structural schematic diagram of a single water sampling tube, sediment sampling tube and rack column of the present invention from another angle; Figure 4 is the structural schematic diagram of the dial of the present invention; Figure 5 is the internal structural schematic diagram of the floating top of the present invention; Figure 6 is the structural schematic diagram of the nut of the present invention; Figure 7 is the structural schematic diagram of the piston of the present invention; Figure 8 is the structural schematic diagram of the sampling gear of the present invention.

[0019] In the figure: 1. floating roof, 101. winding shaft, 102. chain, 2. clamping block, 3. upper plate, 4. lower plate, 401. limiting groove, 5. counterweight, 6. water sampling pipe, 601. water sampling pipe limiting piece, 602. piston, 603. pull rod, 604. nut, 605. water sampling pipe connecting rod, 7. sediment sampling pipe, 701. upper cap, 702. hoop, 703. hoop bolt, 704. hoop nut, 705. sediment sampling pipe connecting rod, 8. rack column, 801. sampling gear, 9. rotating gear, 901. intermittent wheel, 902. intermittent shaft, 903. dialing plate, 904. horizontal seat, 905. limiting block, 906. ring gear, 907. support box. Detailed implementation manner

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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.

[0021] Please refer to Figure 1-8, to solve the problem of researchers frequently traveling back and forth between different sampling points, the device is made to float at the sampling point for a long time by setting up the floating roof 1, and the movement of the rack column 8 is controlled by a motor to achieve sampling at different time points. Thus, there is no need for researchers to repeatedly travel between sampling points, significantly reducing the physical labor intensity during the sampling process and avoiding the high physical exertion of researchers due to frequent travel between different sampling points; reducing the time consumed for commuting between sampling points, enabling researchers to concentrate more time on core research work. The present invention provides a technical solution: an automatic water sampler for collecting microplastic sediments in lake water, including a floating roof 1, the floating roof 1 being made of a material that can float on the water surface, for example, materials such as wood, foam plastic, inflatable materials, etc. that can achieve floating. A counterweight 5 is provided under the floating roof 1, the upper end of the counterweight 5 is fixedly connected to the upper plate 3, and the lower end is fixedly connected to the lower plate 4. It also includes a sampling assembly equipped with a number of rack columns 8. Above each rack column 8, a water sampling tube 6 is detachably connected, and below it, a sediment sampling tube 7 is detachably connected. The water sampling tube 6 is inserted on the upper plate 3, and the sediment sampling tube 7 is located below the lower plate 4. The upper plate 3 and the lower plate 4 are fixedly connected. The rack column 8 is vertically slidably connected to the lower plate 4. An opening larger than the diameter of the rack column 8 is provided on the lower plate 4 to facilitate the sliding of the rack column 8. A sampling gear 801 that can move along the circumferential line of the lower plate 4 and can mesh with each rack column 8 is also provided on the lower plate 4; the sampling gear 801 drives the rack column 8 to move along its axis direction through the drive of a motor; if needed, existing anchor assemblies can be installed on the floating roof 1 to position the floating roof 1. A winding shaft 101 is rotatably connected in the floating roof 1. The winding shaft 101 is driven by a motor. One end of a chain 102 is fixedly connected to the winding shaft 101, and the other end of the chain 102 is fixedly connected to the clamping block 2. The chain 102 can be wound around the winding shaft 101. The clamping block 2 is fixedly connected to the upper plate 3. The clamping block 2 is frustum-shaped, and a groove of a corresponding shape is provided inside the floating roof 1. The clamping block 2 can be inserted into the floating roof 1. In this application, electrical components such as motors are all configured with waterproof treatment. The power supply for the motor uses a self-provided waterproof lithium battery. It can also use a battery equipped for power supply on the floating roof 1 and be connected to the underwater motor through wires. It can also use a solar power supply device equipped on the floating roof 1 and then be connected to the underwater motor through wires for power supply. According to requirements, remote controllers such as GPS and satellite remote sensing can also be equipped. The electrical components can be selected from existing models according to the working conditions.Before use, install the water sampling tube 6, sediment sampling tube 7, and rack column 8, and place the rack column 8 at the highest position. When in use, move multiple devices to the sampling point and drop them into the corresponding water area. First, fix the position of the floating roof 1 by hand or robotic arm. Then, start the winding shaft 101. The winding shaft 101 releases the latch 2, and the device sinks under the action of the counterweight 5. When it sinks to the sampling height, use the anchor assembly or insert a sediment sampling tube 7 to position the device to prevent it from floating away with the water. At this time, the preparatory work is completed and the researchers can withdraw. After preparation, when sampling is required, start the motor. The motor drives the sampling gear 801 to rotate. The sampling gear 801 causes the rack column 8 to descend. The rack column 8 creates a negative pressure in the water sampling tube 6 and pumps water into the water sampling tube 6. At the same time, the rack column 8 drives the sediment sampling tube 7 to descend and insert into the bottom sediment for sampling. When the rack column 8 reaches the maximum descent distance, rotate the gear 9 to drive the sampling gear 801 to move to the next rack column 8. Stop the motor when the sampling gear 801 moves to the next rack column 8, and start again until the next sampling time. Repeat the operation until sampling is completed. After sampling, rotate the winding shaft 101 to retract the latch 2. The latch 2 drives the water sampling tube 6 and sediment sampling tube 7 below it to move up. The latch 2 snaps into the floating roof 1. At this time, the entire device can be taken away. After reaching a suitable position, remove the water sampling tube 6 and sediment sampling tube 7 to take out the water sample and mud sample for research. At this time, the rack column 8 can also be removed for cleaning and storage.

[0022] To achieve sampling of the water sampling tube 6 and sediment sampling tube 7 one by one at the required time, the sampling gear 801 is connected to the lower disc 4 through an intermittent rotation assembly. The intermittent rotation assembly includes a toggle disc 903 with guide bars arranged on the outer circle and an intermittent wheel 901 with a number of intermittent shafts 902. The guide bars consist of an arc and two parallel oblique lines, as Figure 4As shown, the sampling gear 801 is coaxially installed with a toggle plate 903, and the intermittent wheel 901 is fixedly connected to the rotating gear 9 through an axis, and the rotating gear 9 is meshed with the ring gear 906. After the toggle plate 903 rotates one circle, the guide bar on it contacts and toggles the intermittent shaft 902, so that the intermittent wheel 901 drives the rotating gear 9 coaxially connected thereto to move on the ring gear 906, so that every time the toggle plate 903 rotates one circle, the intermittent wheel 901 is toggled through an angle of the intermittent shaft 902, and the ring gear 906 is fixedly connected to the lower plate 4, and the intermittent rotating assembly is installed on the horizontal seat 904, and the horizontal seat 904 is always slidably connected to the lower plate 4, and the rotating gear 9 moves on the ring gear 906 to move the sampling gear 801 to the next rack column 8. The intermittent wheel 901 and the toggle plate 903 are rotatably connected in the support box 907, the support box 907 is fixedly connected to the horizontal seat 904, the sampling gear 801 is driven by a motor, the motor is fixed to the horizontal seat 904, and the horizontal seat 904 is always slidably connected to the lower plate 4. The lower part of the horizontal seat 904 is fixedly connected to a limit block 905, and the limit block 905 is also slidably connected to the limit groove 401, which is annular and arranged on the lower plate 4. When in use, start the motor, the motor drives the sampling gear 801 to rotate, the sampling gear 801 causes the rack column 8 to drop, and the sampling gear 801 drives the toggle plate 903 to rotate. When the sampling gear 801 rotates one circle and the rack column 8 reaches the lowest position, the toggle plate 903 rotates one circle, the toggle plate 903 drives the guide bar thereon to rotate one circle, the guide bar drives the intermittent shaft 902 to move, the intermittent shaft 902 drives the intermittent wheel 901 to rotate, so that the intermittent wheel 901 is toggled through an angle of the intermittent shaft 902, and the intermittent wheel 901 drives the rotating gear 9 to rotate. Since the ring gear 906 is fixed, the rotating gear 9 walks on the ring gear 906, and the rotating gear 9 drives the supporting box 907 to move, the supporting box 907 drives the horizontal seat 904 to move, and the horizontal seat 904 drives the limit block 905 to slide in the limit groove 401, and the horizontal seat 904 drives the sampling gear 801 to leave the rack column 8 meshing with it and move to the next rack column 8. The rack column 8 is set to be cylindrical, and the tooth edge of the sampling gear 801 is set as follows Figure 8 When the teeth of the sampling gear 801 are misaligned with the rack column 8, the inclined surface provides a guide for the rack column 8, causing the rack column 8 to slightly displace so that the rack column 8 can mesh with the sampling gear 801 to avoid interference. The displacement of the rack column 8 is so small that it does not affect the sampling.

[0023] For the convenience of taking out the water sample, a number of round holes are provided on the upper plate 3, and permanent magnets are embedded around the round holes. The upper end of the water sampling tube 6 is fixedly connected with a water sampling tube limiting piece 601, and the diameter of the water sampling tube limiting piece 601 is larger than the round holes on the upper plate 3. Permanent magnets are also embedded on the water sampling tube limiting piece 601. A piston 602 is slidably connected in the water sampling tube 6. The piston 602 is fixedly connected to the upper end of a pull rod 603. The lower end of the pull rod 603 is rotatably connected to a nut 604. The nut 604 is threadedly connected to the upper end of a water sampling tube connecting rod 605. The lower end of the water sampling tube connecting rod 605 is fixedly connected to a rack column 8. When in use, the water sampling tube limiting piece 601 and the upper plate 3 are adsorbed together by magnets. Thread the nut 604 onto the upper end of the water sampling tube connecting rod 605 to perform sampling. After sampling, loosen the nut 604 and pull out the water sampling tube 6 upward to complete the operation.

[0024] For the convenience of taking out the mud sample, the sediment sampling tube 7 is hollow inside. Its upper end is inserted into an upper cap 701. The lower part of the upper cap 701 is fixedly connected to the middle part of a hoop 702. One end of the hoop 702 is always rotatably connected to a hoop bolt 703. The other end of the hoop 702 slides horizontally on the hoop bolt 703. The hoop bolt 703 is threadedly connected to a hoop nut 704. The hoop 702 clamps the sediment sampling tube 7. To achieve sealing, the inner diameter of the upper cap 701 can adopt a gradually changing diameter that is narrow at the upper end and wide at the lower end. Thus, after the sediment sampling tube 7 is inserted into the upper cap 701 and the hoop 702 clamps the sediment sampling tube 7, a seal is formed. The upper cap 701 is fixedly connected to the lower end of a sediment sampling tube connecting rod 705. The upper end of the sediment sampling tube connecting rod 705 is fixedly connected to the rack column 8. One-way valves are provided on both the water sampling tube 6 and the upper cap 701. When the sampling gear 801 drives the rack column 8 to descend, and the rack column 8 drives the pull rod 603 inside the water sampling tube 6 to descend, the pull rod 603 drives the piston 602 to descend. The downward movement of the piston 602 creates a negative pressure inside the water sampling tube 6, and water is drawn into the water sampling tube 6 from the one-way valve at the top end of the water sampling tube 6. Due to the function of the one-way valve, the water that enters the water sampling tube 6 will not flow back out of the water sampling tube 6, thus realizing the storage of the sampled water inside the water sampling tube 6. When the rack column 8 drives the sediment sampling tube 7 to descend and insert into the bottom sediment, the sediment enters the sediment sampling tube 7 and squeezes the air inside it, which is then discharged through the one-way valve on the upper cap 701. This one-way valve can only discharge outward and cannot allow air to enter inward. After the sediment collection is completed, the sediment seals the lower end of the sediment sampling tube 7, and the upper end of the sediment sampling tube 7 is sealed by the one-way valve provided on the upper cap 701. Thus, a negative pressure is formed inside the sediment sampling tube 7, realizing the function of storing the sediment in the sediment sampling tube 7. When in use, use the hoop 702 to clamp the sediment sampling tube 7 to perform sampling. After sampling, rotate the hoop nut 704 to loosen the hoop 702 from the sediment sampling tube 7 to complete the operation.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic water sampler for collecting microplastic sediments in lake water bodies, comprising a floating roof (1), characterized in that: It also includes a sampling assembly equipped with a plurality of rack columns (8), each rack column (8) is detachably connected to a water sampling tube (6) on the top and a sediment sampling tube (7) on the bottom, the water sampling tube (6) is inserted into the upper plate (3), the sediment sampling tube (7) is located below the lower plate (4), the upper plate (3) and the lower plate (4) are fixedly connected, the rack column (8) is vertically slidably connected to the lower plate (4), and the lower plate (4) is also provided with a sampling gear (801) that can move along the circumference of the lower plate (4) and can mesh with each rack column (8); the sampling gear (801) drives the rack column (8) to move along its axial direction through the drive of the motor; The sampling gear (801) is connected to the lower plate (4) through an intermittent rotating assembly. The intermittent rotating assembly includes a toggle plate (903) with a guide strip arranged on the outer circumference and an intermittent wheel (901) with a plurality of intermittent shafts (902). The sampling gear (801) is coaxially mounted with the toggle plate (903). After the toggle plate (903) rotates one circle, the guide strip on it contacts and toggles the intermittent shaft (902), so that the intermittent wheel (901) drives the rotating gear (9) coaxially connected thereto to move on the ring gear (906). The ring gear (906) is fixedly connected to the lower plate (4). The intermittent rotating assembly is mounted on a horizontal seat (904). The horizontal seat (904) is always slidably connected to the lower plate (4). The rotating gear (9) moves on the ring gear (906) to move the sampling gear (801) to the next rack column (8).

2. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 1, wherein: A limit block (905) is fixedly connected below the horizontal seat (904), and the limit block (905) is also slidably connected in a limit groove (401). The limit groove (401) is annular and is arranged on the lower plate (4). The intermittent wheel (901) and the toggle plate (903) are rotatably connected in a support box (907). The support box (907) is fixedly connected to the horizontal seat (904), and a motor driving the sampling gear (801) is fixed on the horizontal seat (904).

3. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 1, wherein: The floating roof (1) is rotatably connected to a winding shaft (101), the winding shaft (101) is driven by a motor, one end of a chain (102) is fixedly connected to the winding shaft (101), the other end of the chain (102) is fixedly connected to a clamping block (2), the chain (102) can be wound around the winding shaft (101), and the clamping block (2) is fixedly connected to an upper plate (3).

4. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 3, characterized in that: The clamping block (2) is in a truncated cone shape, a groove of a corresponding shape is provided inside the floating roof (1), and the clamping block (2) can be inserted into the floating roof (1).

5. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 1, characterized in that: The upper plate (3) is provided with a plurality of circular holes, and permanent magnets are embedded around the circular holes.

6. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 5, characterized in that: The upper end of the water sampling tube (6) is fixedly connected to the water sampling tube limiting piece (601). The diameter of the water sampling tube limiting piece (601) is larger than the circular hole on the upper disc (3). A permanent magnet is also embedded in the water sampling tube limiting piece (601). A piston (602) is slidably connected in the water sampling tube (6). The piston (602) is fixedly connected to the upper end of a pull rod (603). The lower end of the pull rod (603) is rotatably connected to a nut (604). The nut (604) is threadedly connected to the upper end of a water sampling tube connecting rod (605). The lower end of the water sampling tube connecting rod (605) is fixedly connected to a rack column (8).

7. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 1, characterized in that: The sediment sampling tube (7) is provided with a hollow interior. Its upper end is inserted into an upper cap (701). The lower part of the upper cap (701) is fixedly connected to the middle of a hoop (702). One end of the hoop (702) is always rotatably connected to a hoop bolt (703). The other end of the hoop (702) slides horizontally on the hoop bolt (703). The hoop bolt (703) is threadedly connected to a hoop nut (704). The hoop (702) clamps the sediment sampling tube (7). The upper cap (701) is fixedly connected to the lower end of a sediment sampling tube connecting rod (705). The upper end of the sediment sampling tube connecting rod (705) is fixedly connected to a rack column (8).

8. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 6 or 7, characterized in that: One-way valves are provided on both the water sampling tube (6) and the upper cap (701).

9. The automatic water sampler for collecting microplastic sediments in lake water bodies according to claim 1, characterized in that: The middle parts of the upper disc (3) and the lower disc (4) are connected by a counterweight block (5).

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