A device for collecting microplastics in water

Abstract

The utility model relates to a kind of microplastics collecting devices in water.It includes the mobile mounting bracket of bottom installation has trundle and supporting leg, hoist subassembly is installed on mobile mounting bracket, sampling cylinder subassembly is hung on hoist subassembly;Sampling cylinder subassembly includes sampling cylinder body structure, its inner cavity is divided into two chambers by baffle and is fixedly connected in the inside of sampling cylinder body structure, negative pressure water pump and flowmeter are installed in lower chamber;Water inlet is set up in the top of sampling cylinder body structure and is provided with outer filter screen and water inlet horn cover, still including water-permeable plate and shaft sleeve, reciprocating shaft is slidably connected in shaft sleeve, collecting filter screen three, collecting filter screen two and collecting filter screen one are installed on reciprocating shaft;Reciprocating drive mechanism is installed on sampling cylinder body structure, still including counterweight mechanism.The utility model is suitable for large sample water detection, and microplastics can be graded sampling, filter screen blockage can be avoided simultaneously, and the integrity and accuracy of sampling are improved.

Description

Technical Field

[0001] This utility model belongs to the field of water body detection technology, and in particular relates to a microplastic collection device in water. Background Technology

[0002] Suspended solids refer to solid substances suspended in water, including insoluble inorganic and organic matter, as well as silt, clay, and microorganisms. The content of suspended solids in water is one of the indicators for measuring the degree of water pollution. Among the more common suspended solids are microplastics, which are plastic particles with a diameter of less than 5 millimeters. Microplastics are a major carrier of pollution. The small size of microplastics means a higher specific surface area. The larger the specific surface area, the stronger the ability to adsorb pollutants, increasing the nutrient load of water bodies and exacerbating eutrophication.

[0003] With the widespread use of plastic products, the content of microplastics in water bodies is increasing, making the detection of microplastic content in water bodies increasingly important. Water testing requires sampling, but existing sampling devices can only collect small amounts of water samples from each layer of the water body, resulting in low detected microplastic content. To solve this problem, researchers use trawl nets for microplastic sampling. However, trawl nets have a single aperture setting and are prone to errors when collecting small-diameter microplastics. Large-diameter meshes easily miss small-diameter particles, while small-diameter meshes are easily clogged by other impurities in the water body. This also makes it difficult to scientifically assess the degree of microplastic pollution in water bodies. Therefore, there is an urgent need to design a microplastic collection device in water. Utility Model Content

[0004] This invention provides a reasonably structured microplastic collection device for water to address technical problems existing in prior art. This invention is suitable for large-sample water testing and can perform graded sampling of microplastics, while avoiding filter clogging and improving the integrity and accuracy of sampling.

[0005] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: A microplastic collection device in water includes a movable mounting frame with several casters and several support legs installed at the bottom. A lifting assembly is installed on the movable mounting frame, and a sampling tube assembly is hung on the lifting assembly. The sampling tube assembly includes a sampling tube structure with its top attached to the lifting assembly. A partition is fixedly connected inside the sampling tube structure, dividing its inner cavity into upper and lower chambers. A negative pressure water pump is installed in the lower chamber. The inlet of the negative pressure water pump is connected to the upper chamber, and the outlet is connected to the outside of the sampling tube structure. A flow meter is installed at the inlet of the negative pressure water pump. An inlet is opened at the top of the sampling tube structure, and a [missing information - likely a device or component] is installed at the inlet. The device includes an external filter screen and an inlet horn sleeve. It also includes a permeable plate fixed to the upper chamber of the sampling cylinder structure, located below the inlet horn sleeve and having several permeable holes. A shaft sleeve is fixed to the center of the permeable plate. A reciprocating shaft is slidably connected to the shaft sleeve and sequentially seals and passes through the partition and the sampling cylinder structure. Collection filters three, two, and one are installed on the reciprocating shaft, distributed along its axial direction and in frictional contact with the inner wall of the upper chamber of the sampling cylinder structure. The lower collection filter has a larger mesh size than the upper collection filter. A reciprocating drive mechanism for driving the reciprocating shaft to move back and forth along its axial direction is installed on the sampling cylinder structure. The device also includes a counterweight mechanism installed on the sampling cylinder structure.

[0006] The advantages and positive effects of this utility model are as follows: This utility model provides a microplastic collection device in water. By setting a movable mounting frame with casters and support feet at the bottom, the mobility of the sampling device can be improved, making it easy to move the sampling device to a suitable sampling position. The lifting component can easily sink the sampling tube assembly to the underwater sampling position, and the sampling tube assembly can be easily retrieved after the sampling operation is completed. The sampling filter screen 1, sampling filter screen 2, and sampling filter screen 3 set in the sampling tube assembly can collect microplastics in the water body according to different particle sizes. The reciprocating shaft and reciprocating drive mechanism can drive the sampling filter screen 1, sampling filter screen 2, and sampling filter screen 3 to vibrate synchronously, avoiding clogging of the individual sampling filters during the sampling process, ensuring that particles do not clog the sampling filters, and allowing smaller particles to smoothly enter the next stage of sampling filters, thus improving the accuracy of classification and collection.

[0007] Preferably, the reciprocating drive mechanism includes a guide mounting seat fixed to the bottom of the sampling cylinder structure, a reciprocating shaft passing through the guide mounting seat and slidably connected thereto; two opposing drive mounting seats are fixed to the guide mounting seat, and an eccentric wheel is rotatably connected to each drive mounting seat via a shaft. The two eccentric wheels are opposite to each other, and a drive rocker arm is pivotally connected to the eccentric part of the two eccentric wheels via a shaft. The drive rocker arm is pivotally connected to the lower end of the reciprocating shaft via a pin; it also includes a reciprocating motor for driving the two eccentric wheels to rotate synchronously.

[0008] Preferably, the sampling cylinder structure includes a second cylinder shell, a third cylinder shell connected to the upper opening of the second cylinder shell via a flange, a permeable plate installed inside the third cylinder shell, a fourth cylinder shell connected to the upper opening of the third cylinder shell via a flange, an external filter screen installed at the water inlet at the top of the fourth cylinder shell, and a water inlet horn sleeve installed inside the fourth cylinder shell; a first cylinder shell connected to the lower opening of the second cylinder shell via a flange, and a partition plate installed at the mating surface of the first and second cylinder shells.

[0009] Preferably, the counterweight mechanism includes two corresponding counterweight legs installed and fixedly connected to the lower part of the sampling cylinder structure, and a leg connecting rod fixedly connected between the two counterweight legs; each counterweight leg is provided with a plurality of pin holes evenly distributed along its length direction, and also includes a plurality of counterweight discs that are detachably connected to the counterweight legs by positioning pins passing through the pin holes.

[0010] Preferably, the sample tube structure also includes a sealed protective cover installed on the sample tube structure and covering the reciprocating drive mechanism; several lifting ropes are installed on the top of the sample tube structure; lifting rings are installed on the upper part of each lifting rope for connecting to the lifting assembly; and a battery is installed in the lower chamber of the sample tube structure to power the reciprocating drive mechanism and the negative pressure water pump.

[0011] Preferably, the lifting assembly includes a mounting column mounted on a movable mounting frame, a mounting arm fixedly connected to the mounting column, a telescopic cantilever sleeve pivotally connected to the upper end of the mounting arm, a telescopic cantilever rod slidably passing through the telescopic cantilever sleeve, and a plurality of pin holes distributed along their length on both the telescopic cantilever sleeve and the telescopic cantilever rod. The telescopic cantilever sleeve and the telescopic cantilever rod are locked together by pins passing through the pin holes. A linear drive is pivotally connected between the mounting arm and the telescopic cantilever sleeve; it also includes a coil installed between the telescopic cantilever sleeve and the telescopic cantilever rod. The hoisting assembly includes a winch seat mounted on a telescopic cantilever arm, a winch drum rotatably connected to the winch seat and a hoisting motor for driving the winch drum to rotate; it also includes an end mounting seat fixed to the outer end of the telescopic cantilever arm, a fixed pulley rotatably connected to the end mounting seat, a hoisting wire rope wound on the winch drum, the free end of the hoisting wire rope passing over the fixed pulley and connected to a second hook mounted on the end mounting seat, and a movable pulley suspended on the hoisting wire rope, with a first hook mounted on the movable pulley for hanging the sampling tube assembly.

[0012] Preferably, the three collection filters, the second collection filter, and the first collection filter are all truncated cones, and wear-resistant rings that rub against the inner wall of the sampling cylinder are provided on the outer peripheral wall of each collection filter. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0014] Figure 2 This is a cross-sectional view of the sampling tube assembly in this utility model;

[0015] Figure 3 yes Figure 2 Enlarged diagram of region A in the image;

[0016] Figure 4 This is a three-dimensional structural diagram of the counterweight mechanism in this utility model;

[0017] Figure 5 This is a three-dimensional structural diagram of the hoisting assembly in this utility model.

[0018] In the diagram: 1. Casters; 2. Outriggers; 3. Movable mounting frame; 4. Mounting column; 5. Mounting boom; 6. Linear drive; 7. Telescopic cantilever sleeve; 8. Winch lifting assembly; 8-1. Hook 1; 8-2. Moving pulley; 8-3. Hook 2; 8-4. End mounting base; 8-5. Fixed pulley; 8-6. Lifting wire rope; 8-7. Lifting motor; 8-8. Winch drum; 8-9. Winch base; 9. Telescopic cantilever rod; 10. Sampling cylinder assembly; 10-1. Counterweight mechanism; 10-1-1. Counterweight outrigger; 10-1-2. Outrigger connecting rod; 10-1-3. Counterweight plate; 10-2. Sealing protective cover; 10-3. Reciprocating drive mechanism; 10-3-1. Drive mounting base; 10-3-2. Drive swing arm. Rod; 10-3-3, Eccentric wheel; 10-3-4, Reciprocating motor; 10-3-5, Guide mounting seat; 10-4, Collection filter screen one; 10-5, Collection filter screen two; 10-6, Collection filter screen three; 10-7, Reciprocating shaft; 10-7-1, Guide strip; 10-8, Shaft sleeve; 10-9, Permeable plate; 10-10, Upper mounting plate; 10-11, Inlet horn sleeve; 10-12, External filter screen; 10-13, Lifting ring; 10-14, Lifting rope; 10-15, Sampling cylinder structure; 10-15-1, Cylinder shell one; 10-15-2, Cylinder shell two; 10-15-3, Cylinder shell three; 10-15-4, Cylinder shell four; 10-16, Partition plate; 10-17, Negative pressure water pump. Detailed Implementation

[0019] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided in detail:

[0020] Please see Figure 1 The microplastic collection device in water of this utility model includes a movable mounting frame 3 with several casters 1 and several support legs 2 installed at the bottom. A lifting assembly is installed on the movable mounting frame 3, and a sampling tube assembly 10 is hung on the lifting assembly.

[0021] like Figure 2As shown, the sampling tube assembly 10 includes a sampling tube structure 10-15 connected to the top of a lifting assembly. Several lifting ropes 10-14 are installed on the top of the sampling tube structure 10-15. It also includes lifting rings 10-13 installed on the upper part of each lifting rope 10-14 for connecting to the lifting assembly.

[0022] Inside the sampling cylinder structure 10-15, there is a partition 10-16 that divides the inner cavity into upper and lower chambers. A negative pressure water pump 10-17 is installed in the lower chamber. The inlet of the negative pressure water pump 10-17 is connected to the upper chamber, and the outlet is connected to the outside of the sampling cylinder structure 10-15 through a pipeline. In addition, a flow meter is installed at the inlet of the negative pressure water pump 10-17.

[0023] A water inlet is provided at the top of the sampling cylinder structure 10-15, and an external filter screen 10-12 and a water inlet horn sleeve 10-11 are provided at the water inlet. The water inlet horn sleeve 10-11 is flared at the top and smaller at the bottom. It also includes a water permeable plate 10-9 fixed to the upper chamber of the sampling cylinder structure 10-15, located below the water inlet horn sleeve 10-11, and having several water permeable holes.

[0024] A shaft sleeve 10-8 is fixedly connected to the center of the bottom surface of the permeable plate 10-9. A reciprocating shaft 10-7 is slidably connected to the shaft sleeve 10-8 and sequentially seals and passes through the partition plate 10-16 and the sampling cylinder structure 10-15. Collection filters 10-6, 10-5, and 10-4 are installed on the reciprocating shaft 10-7, which are distributed along its axial direction and rub against the inner wall of the upper cavity of the sampling cylinder structure 10-15. The mesh count of the lower collection filter is greater than that of the upper collection filter, thereby ensuring that the pore diameter of the lower collection filter is smaller than that of the upper collection filter. A reciprocating drive mechanism 10-3 is installed on the sampling cylinder structure 10-15 to drive the reciprocating shaft 10-7 to move back and forth along its axial direction. A counterweight mechanism 10-1 is also installed on the sampling cylinder structure 10-15. In this embodiment, the aforementioned sampling filters 10-6 (third), 10-5 (second), and 10-4 (first) are all truncated cones. Each filter has a wear-resistant ring on its outer peripheral wall that rubs against the inner wall of the sampling cylinder structure 10-15. During actual operation, after sampling, the flow rate and velocity decrease, and the particles lose kinetic energy and are captured by the sampling filters under inertia. After sampling, the entire sampling cylinder assembly 10 is brought back to the laboratory for processing and analysis.

[0025] The inlet horn sleeve 10-11 installed at the inlet of the sampling cylinder structure 10-15 is used to create a large-area vortex on the water surface, increasing the efficiency of surface water collection and increasing the inlet area, allowing for the separate collection of surface and deep water. Additionally, an external filter screen 10-12 installed at the upper end of the inlet horn sleeve 10-11 is located above multiple collection filters, and the pore diameter of the external filter screen 10-12 is larger than that of the collection filter screen 10-6 and also larger than the pore diameter of the permeable plate 10-9, used to filter primary debris and impurities. The permeable plate 10-9 evenly disperses the water flow into the sampling cylinder structure 10-15, ensuring that the water flows evenly through the collection filters 10-6, 10-5, and 10-4.

[0026] See further Figure 3 The reciprocating drive mechanism 10-3 mentioned above includes a guide mounting seat 10-3-5 fixedly connected to the bottom of the sampling cylinder structure 10-15. The reciprocating shaft 10-7 passes through the guide mounting seat 10-3-5 and is slidably connected to it. Furthermore, a number of guide bars 10-7-1 distributed circumferentially and extending axially are fixedly connected to the outer peripheral wall of the lower end of the reciprocating shaft 10-7. The guide mounting seat 10-3-5 is provided with a sliding groove corresponding to each guide bar 10-7-1 for passing through the corresponding guide bar 10-7-1 and slidingly engaging with it. Through the above arrangement, the lower part of the reciprocating shaft 10-7 and the guide mounting seat 10-3-5 are splinedly engaged.

[0027] Two opposing drive mounting seats 10-3-1 are fixedly connected to the guide mounting seat 10-3-5. An eccentric wheel 10-3-3 is rotatably connected to each drive mounting seat 10-3-1 via a shaft. The two eccentric wheels 10-3-3 are oppositely arranged. A drive rocker arm 10-3-2 is pivotally connected to the eccentric part of the two eccentric wheels 10-3-3 via a shaft. The drive rocker arm 10-3-2 is pivotally connected to the lower end of the reciprocating shaft 10-7 via a pin. That is, two opposing ear plates are fixedly connected to the lower part of the reciprocating shaft 10-7. The drive rocker arm 10-3-2 is pivotally connected to the two ear plates via a pin. The reciprocating drive mechanism 10-3 also includes a reciprocating motor 10-3-4 for driving the two eccentric wheels 10-3-3 to rotate synchronously.

[0028] like Figure 2As shown, the sampling cylinder assembly 10 also includes a sealed protective cover 10-2 mounted on the sampling cylinder structure 10-15 and covering the reciprocating drive mechanism 10-3; it also includes a battery installed in the lower chamber of the sampling cylinder structure 10-15 for powering the reciprocating drive mechanism 10-3 and the negative pressure water pump 10-17. Additionally, a timer switch is installed inside the lower chamber of the sampling cylinder structure 10-15 to control the timed opening and closing of the negative pressure water pump 10-17.

[0029] like Figure 2 As shown, for convenient sampling, the above-mentioned sampling cylinder structure 10-15 includes a second cylinder shell 10-15-2. A third cylinder shell 10-15-3 is connected to the upper opening of the second cylinder shell 10-15-2 via a flange. A permeable plate 10-9 is installed in the inner cavity of the third cylinder shell 10-15-3. A fourth cylinder shell 10-15-4 is connected to the upper opening of the third cylinder shell 10-15-3 via a flange. An outer filter screen 10-12 is installed at the water inlet at the top of the fourth cylinder shell 10-15-4. A water inlet horn sleeve 10-11 is installed in the inner cavity of the fourth cylinder shell 10-15-4. In addition, an upper mounting plate 10-10 for installing the water inlet horn sleeve 10-11 is fixed to the inner wall of the fourth cylinder shell 10-15-4. A slot corresponding to the water inlet horn sleeve 10-11 is opened in the middle of the upper mounting plate 10-10. At the lower end opening of shell shell 10-15-2, shell shell 10-15-1 is connected to it via a flange. A partition plate 10-16 is installed at the mating surface of shell shell 10-15-1 and shell shell 10-15-2. A sealing ring is provided at the mating surface of each shell, and a sealing ring is also provided between the partition plate 10-16 and the mating shell.

[0030] See further Figure 4 The aforementioned counterweight mechanism 10-1 includes two corresponding counterweight legs 10-1-1 fixedly mounted on the lower part of the sampling cylinder structure 10-15, with a leg connecting rod 10-1-2 fixedly connected between the two counterweight legs 10-1-1. Each counterweight leg 10-1-1 has several pin holes evenly distributed along its length, and also includes several counterweight discs 10-1-3 detachably connected to the counterweight legs 10-1-1 via positioning pins passing through the pin holes. In this embodiment, two sets of the aforementioned counterweight mechanism 10-1 are provided, and the two sets of counterweight mechanism 10-1 are distributed on both sides of the reciprocating drive mechanism 10-3. Through the above arrangement, the counterweight discs 10-1-3 can be added or removed according to actual conditions, thereby ensuring that the sampling cylinder assembly 10 can sink to the corresponding underwater position and ensuring that the sampling cylinder assembly 10 can maintain a stable vertical state in the water as much as possible.

[0031] In addition, the above-mentioned sampling cylinder structure 10-15, water permeable plate 10-9, various collection filters and reciprocating shaft 10-7 and other components are all made of stainless steel to avoid the use of materials that can produce microplastics and impurities. Furthermore, the negative pressure water pump 10-17 and flow meter in the sampling cylinder assembly 10 adopt negative pressure injection to avoid pollution of the collected water.

[0032] See further Figure 1 The aforementioned lifting assembly includes a mounting column 4 mounted on a movable mounting frame 3. A mounting arm 5 is fixedly connected to the mounting column 4. A telescopic cantilever sleeve 7 is pivotally connected to the upper end of the mounting arm 5. A telescopic cantilever rod 9 slides through the telescopic cantilever sleeve 7. Both the telescopic cantilever sleeve 7 and the telescopic cantilever rod 9 have several pin holes distributed along their length. The telescopic cantilever sleeve 7 and the telescopic cantilever rod 9 are locked together by pins passing through the pin holes. A linear drive component 6 is pivotally connected between the mounting arm 5 and the telescopic cantilever sleeve 7. The linear drive component 6 is a hydraulic cylinder or a hydraulic jack. In this embodiment, the linear drive component 6 is a hydraulic jack. Furthermore, the cylinder of the linear drive component 6 is pivotally connected to the mounting arm 5, and the extended end of the linear drive component 6 is pivotally connected to the telescopic cantilever sleeve 7. The lifting assembly also includes a winch lifting assembly 8 installed between the telescopic cantilever sleeve 7 and the telescopic cantilever rod 9.

[0033] See further Figure 5 The aforementioned winch lifting assembly 8 includes a winch seat 8-9 mounted on the telescopic cantilever sleeve 7, a winch drum 8-8 rotatably connected to the winch seat 8-9 and a lifting motor 8-7 for driving the winch drum 8-8 to rotate; it also includes an end mounting seat 8-4 fixed to the outer end of the telescopic cantilever rod 9, a fixed pulley 8-5 rotatably connected to the end mounting seat 8-4, a lifting wire rope 8-6 wound on the winch drum 8-8, the free end of the lifting wire rope 8-6 passing over the fixed pulley 8-5 and connected to a second hook 8-3 mounted on the end mounting seat 8-4, and a movable pulley 8-2 hung on the lifting wire rope 8-6, a first hook 8-1 mounted on the movable pulley 8-2 for hanging the sampling tube assembly 10.

[0034] Working principle:

[0035] When using this invention to sample still water bodies such as lakes, the sampling device is pushed to a suitable sampling position, and then the sampling cylinder assembly 10 is lowered to the sampling position below the water surface using the hoisting assembly 8. The device is then turned on or timed and the sampling time is set. After the negative pressure water pump 10-17 starts, a negative pressure chamber is formed inside the upper chamber of the sampling cylinder structure 10-15. Under the action of negative pressure, the water on the surface enters the upper chamber of the sampling cylinder structure 10-15 through the inlet. The inlet of the inlet funnel sleeve 10-11 forms a large-area vortex, increasing the water collection efficiency; after filtration by the outer filter screen 10-12, larger impurities in the water can be removed. After being dispersed by the permeable plate 10-9, the water flows sequentially through the collection filter screen 3 10-6, collection filter screen 2 10-5 and collection filter screen 1 10-4. Particles of different sizes are intercepted by the corresponding collection filters. Then the water enters the flow meter, calculates the volume of the collected water, and is discharged back into the lake or other water body through the water pump installed column 4.

[0036] During the sampling process, to prevent particulate matter from clogging the collection filters, the reciprocating motor 10-3-4 in the reciprocating drive mechanism 10-3 starts synchronously, driving the two eccentric wheels 10-3-3 to rotate synchronously, which in turn drives the drive swing arm 10-3-2 to swing back and forth. Driven by the drive swing arm 10-3-2, the reciprocating shaft 10-7 moves back and forth along its axis, which in turn drives the several collection filters installed on the reciprocating shaft 10-7 to vibrate synchronously back and forth, so as to ensure that particles do not clog the collection filters, and allow smaller particles to smoothly enter the next stage collection filter, thereby improving the accuracy of classification and collection.

Claims

1. A device for collecting microplastics in water, characterized in that: The system includes a movable mounting frame (3) with several casters (1) and several support legs (2) installed at the bottom. A lifting assembly is installed on the movable mounting frame (3), and a sampling tube assembly (10) is hung on the lifting assembly. The sampling tube assembly (10) includes a sampling tube structure (10-15) with its top attached to the lifting assembly. Inside the sampling tube structure (10-15), a partition (10-16) is fixedly connected to divide its inner cavity into upper and lower chambers. A negative pressure water tank is installed in the lower chamber. The pump (10-17), a negative pressure water pump (10-17), has its inlet connected to the upper chamber and its outlet connected to the outside of the sampling cylinder structure (10-15). A flow meter is installed at the inlet of the negative pressure water pump (10-17). An inlet is provided at the top of the sampling cylinder structure (10-15), and an external filter screen (10-12) and an inlet bell sleeve (10-11) are installed at the inlet. It also includes a component fixed to the upper chamber of the sampling cylinder structure (10-15). A permeable plate (10-9) with several permeable holes is located below the inlet bell sleeve (10-11). A shaft sleeve (10-8) is fixedly connected to the center of the permeable plate (10-9). A reciprocating shaft (10-7) is slidably connected to the shaft sleeve (10-8) and sequentially seals and passes through the partition plate (10-16) and the sampling cylinder structure (10-15). On the reciprocating shaft (10-7), there are shafts that are distributed along its axial direction and connected to the sampling cylinder structure (10-11). 5) The upper chamber wall of the sampling cylinder has three sampling filters (10-6), two sampling filters (10-5), and one sampling filter (10-4) in frictional contact, with the lower sampling filter having a larger mesh size than the upper sampling filter; a reciprocating drive mechanism (10-3) for driving the reciprocating shaft (10-7) to move reciprocally along its axial direction is installed on the sampling cylinder structure (10-15), and a counterweight mechanism (10-1) is also installed on the sampling cylinder structure (10-15).

2. The microplastic collection device in water as described in claim 1, characterized in that: reciprocating... The drive mechanism (10-3) includes a guide mounting seat (10-3-5) fixedly attached to the bottom of the sampling cylinder structure (10-15), a reciprocating shaft (10-7) passing through the guide mounting seat (10-3-5) and slidably connected thereto; two opposing drive mounting seats (10-3-1) are fixedly attached to the guide mounting seat (10-3-5), and an eccentric wheel (10-3-3) is rotatably connected to each drive mounting seat (10-3-1) via a shaft. The two eccentric wheels (10-3-3) are opposite to each other, and a drive rocker arm (10-3-2) is pivotally connected to the eccentric part of the two eccentric wheels (10-3-3) via a shaft. The drive rocker arm (10-3-2) is pivotally connected to the lower end of the reciprocating shaft (10-7) via a pin; it also includes a reciprocating motor (10-3-4) for driving the two eccentric wheels (10-3-3) to rotate synchronously.

3. The microplastic collection device in water as described in claim 1, characterized in that: The sampling cylinder structure (10-15) includes a second cylinder shell (10-15-2), a third cylinder shell (10-15-3) connected to the upper opening of the second cylinder shell (10-15-2) via a flange, a permeable plate (10-9) installed inside the third cylinder shell (10-15-3), and a fourth cylinder shell (10-15-4) connected to the upper opening of the third cylinder shell (10-15-3) via a flange. An external filter screen (10-1...) 2) The water inlet sleeve (10-11) is installed at the water inlet at the top of the shell 4 (10-15-4); the water inlet bell sleeve (10-11) is installed in the inner cavity of the shell 4 (10-15-4); the shell 1 (10-15-1) is connected to the lower end of the shell 2 (10-15-2) by a flange at the opening, and the partition plate (10-16) is installed at the mating surface of the shell 1 (10-15-1) and the shell 2 (10-15-2).

4. The microplastics collection device in water as described in claim 1, characterized in that: The counterweight mechanism (10-1) includes two corresponding counterweight legs (10-1-1) installed and fixedly connected to the lower part of the sampling cylinder structure (10-15), and a leg connecting rod (10-1-2) fixedly connected between the two counterweight legs (10-1-1); each counterweight leg (10-1-1) is provided with a number of pin holes evenly distributed along its length direction, and also includes a number of counterweight discs (10-1-3) that are detachably connected to the counterweight legs (10-1-1) through positioning pins passing through the pin holes.

5. The microplastics collection device in water as described in claim 1, characterized in that: It also includes a sealed protective cover (10-2) installed on the sampling cylinder structure (10-15) and covering the reciprocating drive mechanism (10-3); several lifting ropes (10-14) are installed on the top of the sampling cylinder structure (10-15); lifting rings (10-13) are installed on the upper part of each lifting rope (10-14) for connecting to the lifting assembly; and a battery installed in the lower chamber of the sampling cylinder structure (10-15) for powering the reciprocating drive mechanism (10-3) and the negative pressure water pump (10-17).

6. The microplastics collection device in water as described in claim 1, characterized in that: The lifting assembly includes a mounting column (4) mounted on a movable mounting frame (3), a mounting arm (5) fixedly connected to the mounting column (4), a telescopic cantilever sleeve (7) pivotally connected to the upper end of the mounting arm (5), a telescopic cantilever rod (9) slidingly passing through the telescopic cantilever sleeve (7), and several pin holes distributed along their length directions on both the telescopic cantilever sleeve (7) and the telescopic cantilever rod (9). The telescopic cantilever sleeve (7) and the telescopic cantilever rod (9) are locked together by pins passing through the pin holes. A linear drive (6) is pivotally connected between the mounting arm (5) and the telescopic cantilever sleeve (7). It also includes a winch lifting assembly (8) installed between the telescopic cantilever sleeve (7) and the telescopic cantilever rod (9). The winch lifting assembly (8) includes components in the telescopic cantilever sleeve (7). The system includes a winch seat (8-9) mounted on the upper part of the boom (9), a winch drum (8-8) rotatably connected to the winch seat (8-9) and a lifting motor (8-7) for driving the winch drum (8-8) to rotate; it also includes an end mounting seat (8-4) fixed to the outer end of the telescopic cantilever (9), a fixed pulley (8-5) rotatably connected to the end mounting seat (8-4), a lifting wire rope (8-6) wound on the winch drum (8-8), the free end of the lifting wire rope (8-6) passing over the fixed pulley (8-5) and connected to a second hook (8-3) mounted on the end mounting seat (8-4), and a movable pulley (8-2) hung on the lifting wire rope (8-6), a first hook (8-1) mounted on the movable pulley (8-2) for hanging the sampling tube assembly (10).

7. The microplastics collection device in water as described in claim 1, characterized in that: The three collection filters (10-6), two collection filters (10-5), and one collection filter (10-4) are all truncated cones. Each collection filter has a wear-resistant ring on its outer peripheral wall that rubs against the inner wall of the sampling cylinder structure (10-15).

Images