Automatic sampling device for farmland soil micro-plastic sample

Abstract

The invention discloses an automatic sampling device for a farmland soil micro-plastic sample. The automatic sampling device comprises a supporting assembly, a pretreatment assembly arranged on the supporting assembly, a drying assembly arranged in the pretreatment assembly and a first collecting assembly arranged at the end part of the pretreatment assembly, the pretreatment assembly is used for stirring and crushing farmland soil, the drying assembly is used for drying the farmland soil, and the first collection assembly is used for adsorbing, fixing and separating micro-plastic particles in the dried farmland soil; the device is reasonable in structural design, high in automation degree and integration degree and extremely high in operation convenience, effectively improves the collection efficiency of micro-plastic samples in farmland soil, provides equipment support for farmland soil analysis and research, and is suitable for large-scale popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of soil environment detection, and in particular to an automated sampling device for farmland soil microplastic samples. Background Art

[0002] The sources of microplastics in farmland soil are very wide, mainly including agricultural film degradation, organic fertilizer application, plastic waste landfill, sludge reuse and other channels. Agricultural film forms smaller microplastic particles (<5mm) under the action of photodegradation, oxidation and mechanical fragmentation over time. These particles are called microplastics. The residual agricultural film causes great harm to the soil environment. Recently, studies have found that microplastics in the soil enter the food chain through biological ingestion or plant absorption, which is harmful to human health. At the same time, microplastics can not only enter the brains of mammals, but also enter the human blood, and have become a new type of pollutant that cannot be ignored.

[0003] Compared with microplastics in aquatic environments, microplastics in terrestrial soils are more difficult to separate and extract. From an environmental background perspective, the composition of terrestrial soils is relatively complex, with many objective influencing factors. It is not easy to conduct scientific research experiments on microplastics, and the separation and detection effects are not obvious. Currently, the focus of attention on microplastic pollution is mainly on the aquatic environment. There is relatively little research on the current status of terrestrial microplastic pollution, especially microplastic pollution in farmland soils, which restricts people's research on microplastic pollution in farmland soils. Summary of the invention

[0004] In response to the above-mentioned technical problems, the present invention provides an automated sampling device for farmland soil microplastic samples.

[0005] The technical solution of the present invention is: an automated sampling device for farmland soil microplastic samples, comprising a support component, a pretreatment component arranged on the support component, a drying component arranged inside the pretreatment component, and a first collection component arranged at the end of the pretreatment component; the support component comprises a base and a support frame arranged on the upper end surface of the base;

[0006] The pre-processing assembly includes a cylinder arranged at the top of the support frame, an inner sleeve arranged inside the cylinder, a crushing frame rotatably clamped inside the inner sleeve, and a rotating motor arranged at the end of the cylinder and providing power for the crushing frame;

[0007] The drying assembly includes a plurality of conveying pipes equidistantly distributed inside the side wall of the inner sleeve and a hot air blower arranged on the upper end surface of the base; an annular pipe connected to each conveying pipe is arranged at one end of the cylinder body close to the rotating motor, and the annular pipe is connected to the output end of the hot air blower;

[0008] The first collection component includes a collection box arranged at one end of the cylinder away from the rotating motor, a first adsorption filter membrane movably connected to the inside of the collection box, and an exhaust fan arranged on the outer wall of the collection box; the collection box is connected to the inside of the inner sleeve.

[0009] Furthermore, a filtering hole is provided at the lower position of the inner sleeve; opening plates are rotatably clamped on both sides of the bottom end of the inner sleeve, and arc-shaped racks are provided at both ends of the outer walls of the two opening plates; driving shafts are rotatably clamped at the positions corresponding to the two opening plates inside the cylinder, and the two driving shafts are sleeved with driving gears that are meshed and connected with the arc-shaped racks at the corresponding positions in a one-to-one correspondence, and the ends of the two driving shafts pass through the cylinder and are provided with connecting sprockets; reduction motors are provided on the upper end surface of the base and are respectively located below the two connecting sprockets, and main sprockets are provided at the output ends of the two reduction motors; the two main sprockets are respectively connected to the two connecting sprockets through chains in a one-to-one correspondence; a second collection component connected to the cylinder is provided on the upper end surface of the base;

[0010] Description: After the large particles of microplastic samples in the soil are adsorbed and collected by the first adsorption filter membrane, the reduction motor is used to drive the drive shaft to rotate, so that the opening plate slides on the inner sleeve and detaches from the filter hole area on the inner sleeve, making it easier for the crushed soil particles inside the inner sleeve to enter the second collection component.

[0011] Furthermore, the second collection assembly includes a flotation box arranged at the bottom end of the cylinder, a plurality of ultrasonic vibrating rods equidistantly distributed inside the flotation box, a filter box arranged on the base, and a second adsorption filter membrane movably connected to the inside of the filter box; a dosing tube and a first liquid discharge tube are arranged on the outer wall of the flotation box; a vibration seat connected to each ultrasonic vibrating rod at the same time is arranged at the bottom end of the flotation box, and an ultrasonic generator electrically connected to the vibration seat is arranged on the base; a second liquid discharge tube is arranged on the outer wall of the filter box; a suction pump is arranged at the top of the filter box, the input end of the suction pump is connected to the first conduit penetrating the flotation box, and the output end of the suction pump is connected to the second conduit penetrating the filter box;

[0012] Description: The soil inside the inner sleeve falls into the flotation box during the rotation of the crushing frame. The flotation agent is added into the flotation box through the dosing tube, and the flotation agent and the soil are ultrasonically mixed using an ultrasonic vibrator. After the mixed solution is allowed to stand and stratify, the upper non-precipitated layer of the mixed solution is sucked into the filter box using a suction pump, and the microplastic particles in the mixed solution are adsorbed again using the second adsorption filter membrane.

[0013] Furthermore, a floating tube is slidably connected to the end of the first conduit, a floating ball is arranged at the bottom of the floating tube, and a water inlet hole is arranged through the bottom of the floating ball; an observation window is arranged on the outer wall of the flotation box and at a position corresponding to the position of the floating ball;

[0014] Note: The float can drive the floating tube to move as the liquid level inside the flotation box changes, which is beneficial for the non-sedimentation layer inside the flotation box to completely enter the filter box, and is beneficial for improving the thoroughness of the collection of microplastic samples in farmland soil.

[0015] Furthermore, a pull-out plate connected to the second adsorption filter membrane is movably plugged into the side wall of the filter box;

[0016] Note: By setting up a pull-out plate, it is convenient to replace the second adsorption filter membrane.

[0017] Furthermore, a plurality of docking rods are evenly distributed at the connection between the cylinder and the collection box, and a holder is provided at the end of each docking rod; a mounting hole that can be sleeved on the outside of the holder is provided on the outer wall of the collection box, and an arc-shaped slide groove is provided on the outer wall of the collection box and at the position corresponding to each mounting hole;

[0018] Note: When connecting the collection box to the cylinder, align the mounting hole on the collection box with the docking rod, and then rotate the collection box. At this time, the docking rod slides inside the corresponding arc-shaped slide groove, so that the card seat is connected to the outer wall of the collection box, which is conducive to improving the installation convenience of the collection box.

[0019] Furthermore, the clamping seat is slidably clamped on the outside of the docking rod, and a compression spring abutting against the clamping seat is sleeved on a side of the docking rod away from the cylinder;

[0020] Note: By setting a compression spring, the card seat is always pressed tightly against the outer wall of the collection box, which is beneficial to improve the sealing between the collection box and the cylinder.

[0021] Furthermore, the cylinder includes a jacket and sealing covers movably connected to both ends of the jacket; the rotating motor and the collection box are respectively arranged on the two sealing covers in a one-to-one correspondence;

[0022] Description: By setting up a split cylinder, it is easy to clean the inside of the cylinder, and it is also easy to replace and maintain the various equipment components inside the cylinder, ensuring the operating reliability of the device.

[0023] The method of use of the present invention comprises the following steps:

[0024] S1. Place the soil into the inner sleeve through the feeding end cover, use the rotating motor to drive the crushing frame to rotate, and continuously stir the soil; at the same time, use the hot air blower to pass the high-temperature hot air into each conveying pipe through the annular pipe, and the high-temperature hot air is blown into the soil through the air outlet on the conveying pipe to dry the soil;

[0025] S2, turn on the exhaust fan and make the crushing frame rotate. Large particles of microplastics in the soil enter the collection box under the action of the exhaust fan and are adsorbed and fixed by the first adsorption filter membrane;

[0026] S3, using the reduction motor to drive the drive shaft to rotate, so that the opening plate slides on the inner sleeve and then detaches from the filter hole area on the inner sleeve; the soil inside the inner sleeve falls into the flotation box during the rotation of the crushing frame;

[0027] S4. Add flotation reagents into the flotation box through a dosing tube, use an ultrasonic generator to transmit electrical signals to an ultrasonic vibrator, which converts the electrical signals into mechanical energy to ultrasonically mix the flotation reagents and soil particles. After the mixed solution in the flotation box is static and stratified, use a suction pump to suck the upper non-precipitated layer of the mixed solution into the filter box, and use a second adsorption filter membrane to adsorb and fix small particles of microplastics in the mixed solution; wherein the flotation reagent uses a NaCl solution with a volume concentration of 15-25%, and the volume ratio of the flotation reagent to the soil particles is 5:1;

[0028] S5. Take out the first adsorption filter membrane and the second adsorption filter membrane, and separate the microplastic particles adsorbed on the first adsorption filter membrane and the second adsorption filter membrane; wherein, the first adsorption filter membrane and the second adsorption filter membrane both use hollow fiber membranes, the pore size of the first adsorption filter membrane is 3 mm, and the pore size of the second adsorption filter membrane is 1 mm.

[0029] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0030] First, the present invention has a reasonable structural design, and uses the first adsorption filter membrane and the second adsorption filter membrane to collect microplastic samples in farmland soil in steps, which effectively improves the separation effect and separation efficiency of microplastic samples in farmland soil, and provides reliable test samples for the study of microplastic pollution in farmland soil;

[0031] Second, the present invention prevents the interference of impurity particles in the soil on the extraction of microplastic samples by drying, crushing and filtering the farmland soil, which is beneficial to improve the purity of the separated microplastic samples and lays a foundation for the research and analysis of the content and composition of farmland soil microplastic samples;

[0032] Third, the present invention has a high degree of automation and integration, which improves the operational convenience of the device, thereby effectively improving the collection efficiency of microplastic samples in farmland soil and providing equipment support for farmland soil analysis and research. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a longitudinal sectional view of the present invention;

[0034] Figure 2 It is a front view of the present invention;

[0035] Figure 3 It is a left side view of the present invention;

[0036] Figure 4It is a schematic structural diagram of the inner sleeve of the present invention;

[0037] Figure 5 It is a schematic diagram of the internal structure of the inner sleeve of the present invention;

[0038] Figure 6 The present invention Figure 5 A local enlarged schematic diagram of the middle A;

[0039] Figure 7 It is a schematic diagram of the connection between the opening plate and the inner sleeve of the present invention;

[0040] Figure 8 It is a schematic diagram of the connection between the collection box and the sealing cover of the present invention;

[0041] Fig. 9 The present invention Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0042] Fig.10 is a schematic diagram of the connection between the first conduit and the flotation tank of the present invention;

[0043] Among them, 1-support component, 10-base, 11-support frame, 2-pretreatment component, 20-cylinder, 200-feeding end cover, 201-inlet pipe, 202-jacket, 203-sealing cover, 21-inner sleeve, 210-filter hole, 22-crushing frame, 220-crushing teeth, 23-rotating motor, 24-opening plate, 240-arc rack, 25-drive shaft, 250-drive gear, 251-connecting sprocket, 26-reduction motor, 260-main sprocket, 3-drying component, 30 conveying pipe, 300-air outlet, 301-barrier net, 31-hot air blower, 32-annular pipe, 4-first collection Components, 40-collection box, 400-mounting hole, 401-arc slide, 41-first adsorption filter membrane, 42-exhaust fan, 43-docking rod, 430-card seat, 431-compression spring, 5-second collection component, 50-flotation box, 500-dosing tube, 501-first drainage pipe, 502-observation window, 51-ultrasonic vibration rod, 510-vibration seat, 511-ultrasonic generator, 52-filter box, 520-second drainage pipe, 53-second adsorption filter membrane, 530-pull-out plate, 54-suction pump, 540-first conduit, 541-second conduit, 542-floating tube, 543-float. DETAILED DESCRIPTION

[0044] Example 1

[0045] like Figure 1 , 2An automated sampling device for farmland soil microplastic samples is shown, comprising a support component 1, a pretreatment component 2 arranged on the support component 1, a drying component 3 arranged inside the pretreatment component 2, and a first collection component 4 arranged at the end of the pretreatment component 2; the support component 1 comprises a base 10 and a support frame 11 arranged on the upper end surface of the base 10;

[0046] like Figure 1 , 2 As shown, the pretreatment component 2 includes a cylinder 20 arranged at the top of the support frame 11, an inner sleeve 21 sleeved inside the cylinder 20, a crushing frame 22 rotatably clamped inside the inner sleeve 21, and a rotating motor 23 arranged at the end of the cylinder 20 and providing power for the crushing frame 22; the cylinder 20 includes an outer sleeve 202 and sealing covers 203 movably connected to both ends of the outer sleeve 202; one of the sealing covers 203 is provided with a feeding end cover 200 and an air inlet pipe 201; the rotating motor 23 is arranged on one of the sealing covers 203;

[0047] like Figure 1 , 5 As shown in 6, the drying assembly 3 includes four equidistantly distributed delivery pipes 30 inside the side wall of the inner sleeve 21 and a hot air blower 31 arranged on the upper end surface of the base 10; each delivery pipe 30 is provided with an air outlet 300 penetrating the inner wall of the inner sleeve 21; an annular pipe 32 connected to each delivery pipe 30 is provided at one end of the cylinder 20 close to the rotating motor 23, and the annular pipe 32 is connected to the output end of the hot air blower 31;

[0048] like Figure 1 As shown, the first collection component 4 includes a collection box 40 arranged on another sealing cover 203, a first adsorption filter membrane 41 movably connected to the inside of the collection box 40, and an exhaust fan 42 arranged on the outer wall of the collection box 40; the collection box 40 is connected to the inside of the inner sleeve 21.

[0049] The method of using this embodiment includes the following steps:

[0050] S1. Place the soil into the inner sleeve 21 through the feeding end cover 200, and use the rotating motor 23 to drive the crushing frame 22 to rotate and continuously stir the soil; at the same time, use the hot air blower 31 to pass the high-temperature hot air into each conveying pipe 30 through the annular pipe 32, and the high-temperature hot air is blown into the soil through the air outlet 300 on the conveying pipe 30 to dry the soil;

[0051] S2, turn on the exhaust fan 42 and make the crushing frame rotate. The large particles of microplastics in the soil enter the collection box 40 under the action of the exhaust fan 42 and are adsorbed and fixed by the first adsorption filter membrane 41;

[0052] S3. Take out the first adsorption filter membrane 41 from the collection box 40, and separate the microplastic particles adsorbed on the first adsorption filter membrane 41; wherein, the first adsorption filter membrane 41 adopts a hollow fiber membrane, and the pore size of the first adsorption filter membrane 41 is 3 mm.

[0053] Example 2

[0054] The difference between this embodiment and embodiment 1 is that:

[0055] like Figure 3 , 4 As shown in , 5 and 7, a filter hole 210 is provided at the lower position of the inner sleeve 21; both sides of the bottom end of the inner sleeve 21 are rotatably clamped with opening plates 24, and both ends of the outer wall of the two opening plates 24 are provided with arc-shaped racks 240; the inside of the cylinder 20 and the positions corresponding to the positions of the two opening plates 24 are rotatably clamped with drive shafts 25, and the two drive shafts 25 are sleeved with drive gears 250 that are meshed and connected with the arc-shaped racks 240 at the corresponding positions, and the ends of the two drive shafts 25 pass through the cylinder 20 and are A connecting sprocket 251 is provided; a reduction motor 26 is provided on the upper end surface of the base 10 and is respectively located below the two connecting sprockets 251, and a main sprocket 260 is provided at the output end of the two reduction motors 26; the two main sprockets 260 are respectively connected to the two connecting sprockets 251 through chains in a one-to-one transmission connection; a second collection component 5 connected to the cylinder 20 is provided on the upper end surface of the base 10; wherein the second collection component 5 adopts the existing technology, for example, it can be a pressurized extraction device in the existing technology.

[0056] In this embodiment:

[0057] The reduction motor 26 is used to drive the driving shaft 25 to rotate, so that the opening plate 24 slides on the inner sleeve 21 and then disengages from the filter hole 210 area on the inner sleeve 21; the soil inside the inner sleeve 21 falls into the second collection component 5 during the rotation of the crushing frame 22; the second collection component 5 is used to extract and separate the microplastic particles in the soil.

[0058] Example 3

[0059] The difference between this embodiment and embodiment 2 is that:

[0060] like Figure 1 , 2As shown, the second collection assembly 5 includes a flotation box 50 arranged at the bottom end of the cylinder 20, 15 ultrasonic vibration rods 51 equidistantly distributed inside the flotation box 50, a filter box 52 arranged on the base 10, and a second adsorption filter membrane 53 movably connected to the inside of the filter box 52; a dosing tube 500 and a first liquid discharge pipe 501 are arranged on the outer wall of the flotation box 50; a vibration seat 510 connected to each ultrasonic vibration rod 51 is arranged at the bottom end of the flotation box 50, and an ultrasonic generator 511 electrically connected to the vibration seat 510 is arranged on the base 10; a second liquid discharge pipe 520 is arranged on the outer wall of the filter box 52; a suction pump 54 is arranged at the top of the filter box 52, the input end of the suction pump 54 is connected to the first conduit 540 that runs through the flotation box 50, and the output end of the suction pump 54 is connected to the second conduit 541 that runs through the filter box 52.

[0061] In this embodiment:

[0062] Soil particles fall into the flotation box 50 through the filter holes 210 on the inner sleeve 21. First, a flotation agent is added to the flotation box 50 through the dosing tube 500. The ultrasonic generator 511 is used to transmit the electrical signal to the ultrasonic vibration rod 51. The ultrasonic vibration rod 51 converts the electrical signal into mechanical energy to ultrasonically mix the flotation agent and the soil particles. After the mixed solution in the flotation box 50 is statically layered, the upper non-precipitated layer of the mixed solution is sucked into the filter box 52 by the suction pump 54, and the small particles of microplastics in the mixed solution are adsorbed and fixed by the second adsorption filter membrane 53. The flotation agent is a NaCl solution with a volume concentration of 15-25%, and the volume ratio of the flotation agent to the soil particles is 5:1.

[0063] Then, the second adsorption filter membrane 53 is taken out from the filter box 52, and the microplastic particles adsorbed on the second adsorption filter membrane 53 are separated; wherein, the second adsorption filter membrane 53 adopts a hollow fiber membrane, and the pore size of the second adsorption filter membrane 53 is 1 mm.

[0064] Example 4

[0065] The difference between this embodiment and embodiment 3 is that:

[0066] like Figure 1 , 2 As shown in Figure 10, a floating tube 542 is slidably connected to the end of the first conduit 540, a floating tube 542 is provided at the bottom of the floating tube 542, and a water inlet hole is penetrated at the bottom of the floating ball 543; an observation window 502 is provided on the outer wall of the flotation box 50 and at a position corresponding to the position of the floating ball 543; a pull-out plate 530 connected to the second adsorption filter membrane 53 is movably inserted on the side wall of the filter box 52.

[0067] In this embodiment:

[0068] The float ball 543 can drive the float tube 542 to move as the liquid level inside the flotation box 50 changes, so that the non-sedimentation layer inside the flotation box 50 completely enters the filter box 52.

[0069] Example 5

[0070] The difference between this embodiment and embodiment 4 is that:

[0071] like Figure 8 , 9 As shown, four docking rods 43 are equidistantly distributed at the connection between the cylinder 20 and the collection box 40, and a socket 430 is provided at the end of each docking rod 43; a mounting hole 400 that can be sleeved on the outside of the socket 430 is provided on the outer wall of the collection box 40, and an arc-shaped slide groove 401 is penetrated on the outer wall of the collection box 40 and at the position corresponding to each mounting hole 400; the socket 430 is slidably clamped on the outside of the docking rod 43, and a compression spring 431 that abuts against the socket 430 is sleeved on the side of the docking rod 43 away from the cylinder 20.

[0072] In this embodiment:

[0073] When the collection box 40 is connected to the cylinder 20, the mounting hole 400 on the collection box 40 is aligned with the docking rod 43, and then the collection box 40 is rotated. At this time, the docking rod 43 slides inside the corresponding arc-shaped slide groove 401, so that the holder 430 is tightly attached to the outer wall of the collection box 40 under the action of the compression spring 431.

[0074] Example 6

[0075] The difference between this embodiment and embodiment 5 is that:

[0076] like Figure 6 As shown, barrier nets 301 are provided on the inner wall of the inner sleeve 21 and at positions corresponding to the positions of the air outlet nozzles 300 .

[0077] Example 7

[0078] The difference between this embodiment and embodiment 6 is that:

[0079] like Figure 6 As shown, crushing teeth 220 are provided on the side wall of the crushing frame 22 .

[0080] It should be noted that the rotating motor 23, reduction motor 26, hot air blower 31, exhaust fan 42, ultrasonic vibration rod 51, ultrasonic generator 511 and suction pump 54 used in the present invention all adopt existing technologies, and are not specifically limited here. The corresponding products can be selected according to actual needs.

Claims

1. An automated sampling device for farmland soil microplastic samples, characterized in that: It comprises a support component (1), a pretreatment component (2) arranged on the support component (1), a drying component (3) arranged inside the pretreatment component (2), and a first collection component (4) arranged at the end of the pretreatment component (2); the support component (1) comprises a base (10) and a support frame (11) arranged on the upper end surface of the base (10); The pre-processing assembly (2) comprises a cylinder (20) arranged at the top end of the support frame (11), an inner sleeve (21) sleeved inside the cylinder (20), a crushing frame (22) rotatably engaged inside the inner sleeve (21), and a rotating motor (23) arranged at the end of the cylinder (20) and providing power to the crushing frame (22); The drying assembly (3) comprises a plurality of delivery pipes (30) equidistantly distributed inside the side wall of the inner sleeve (21) and a hot air blower (31) arranged on the upper end surface of the base (10); an annular pipe (32) connected to each of the delivery pipes (30) is arranged at one end of the cylinder (20) close to the rotating motor (23), and the annular pipe (32) is connected to the output end of the hot air blower (31); The first collection assembly (4) comprises a collection box (40) arranged at one end of the cylinder (20) away from the rotating motor (23), a first adsorption filter membrane (41) movably connected to the interior of the collection box (40), and an exhaust fan (42) arranged on the outer wall of the collection box (40); the collection box (40) is in electrical communication with the interior of the inner sleeve (21).

2. The automated sampling device for farmland soil microplastic samples according to claim 1, characterized in that: The inner sleeve (21) is provided with a filter hole (210) at a lower position; both sides of the bottom end of the inner sleeve (21) are rotatably clamped with opening plates (24), and both ends of the outer side walls of the two opening plates (24) are provided with arc-shaped racks (240); the inside of the cylinder (20) and at positions corresponding to the two opening plates (24) are rotatably clamped with drive shafts (25), and the two drive shafts (25) are sleeved with drive gears (250) that are meshed and connected with the arc-shaped racks (240) at corresponding positions. ) both pass through the cylinder (20) and are provided with a connecting sprocket (251); a reduction motor (26) is provided on the upper end surface of the base (10) and is respectively located below the two connecting sprockets (251); the output ends of the two reduction motors (26) are both provided with a main sprocket (260); the two main sprockets (260) and the two connecting sprockets (251) are respectively connected to each other in a one-to-one transmission manner via chains; and a second collection assembly (5) connected to the cylinder (20) is provided on the upper end surface of the base (10).

3. The automated sampling device for farmland soil microplastic samples according to claim 1, characterized in that: The second collection assembly (5) comprises a flotation box (50) arranged at the bottom end of the cylinder (20), a plurality of ultrasonic vibrating rods (51) equidistantly distributed inside the flotation box (50), a filter box (52) arranged on the base (10), and a second adsorption filter membrane (53) movably connected to the inside of the filter box (52); a dosing pipe (500) and a first liquid discharge pipe (501) are arranged on the outer side wall of the flotation box (50); and a plurality of ultrasonic vibrating rods (51) are arranged at the bottom end of the flotation box (50) so as to simultaneously connect with each of the ultrasonic vibrating rods. A vibration seat (510) connected to the moving rod (51), an ultrasonic generator (511) electrically connected to the vibration seat (510) is arranged on the base (10); a second liquid discharge pipe (520) is arranged on the outer wall of the filter box (52); a suction pump (54) is arranged at the top of the filter box (52), the input end of the suction pump (54) is connected to a first conduit (540) penetrating the flotation box (50), and the output end of the suction pump (54) is connected to a second conduit (541) penetrating the filter box (52).

4. The automated sampling device for farmland soil microplastic samples according to claim 3, characterized in that: A floating tube (542) is slidably engaged at the end of the first guide tube (540), a floating ball (543) is provided at the bottom end of the floating tube (542), and a water inlet hole is provided through the bottom end of the floating ball (543); an observation window (502) is provided on the outer wall of the flotation box (50) at a position corresponding to the position of the floating ball (543).

5. The automated sampling device for farmland soil microplastic samples according to claim 3, characterized in that: A pull-out plate (530) connected to the second adsorption filter membrane (53) is movably inserted on the side wall of the filter box (52).

6. The automated sampling device for farmland soil microplastic samples according to claim 1, characterized in that: A plurality of docking rods (43) are equidistantly distributed at the connection between the cylinder (20) and the collection box (40), and a holder (430) is provided at the end of each of the docking rods (43); a mounting hole (400) capable of being sleeved on the outside of the holder (430) is provided on the outer wall of the collection box (40), and an arc-shaped sliding groove (401) is provided on the outer wall of the collection box (40) and at a position corresponding to each of the mounting holes (400).

7. The automated sampling device for farmland soil microplastic samples according to claim 6, characterized in that: The clamping seat (430) is slidably clamped on the outside of the docking rod (43), and a compression spring (431) abutting against the clamping seat (430) is sleeved on the side of the docking rod (43) away from the cylinder (20).

8. The automated sampling device for farmland soil microplastic samples according to claim 1, characterized in that: The cylinder (20) comprises an outer sleeve (202) and sealing covers (203) movably connected to both ends of the outer sleeve (202); the rotating motor (23) and the collection box (40) are respectively arranged on the two sealing covers (203) in a one-to-one correspondence.

9. The automated sampling device for farmland soil microplastic samples according to claim 1, characterized in that: A pull-out plate (530) is movably inserted on the side wall of the filter box (52), and the pull-out plate (530) is connected to the second adsorption filter membrane (53).

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