CN109591222B

CN109591222B - Sorting device for different-particle-size micro-plastics in soil

Info

Publication number: CN109591222B
Application number: CN201811494909.1A
Authority: CN
Inventors: 吴小莲; 陈忻; 方铮; 徐小亚; 王海龙
Original assignee: Foshan University
Current assignee: Foshan University
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2020-10-09
Anticipated expiration: 2038-12-07
Also published as: CN109591222A

Abstract

The invention relates to a sorting device for micro-plastics with different particle sizes in soil, which relates to the technical field of extraction of the micro-plastics in the soil and comprises a support column and a first filter screen, wherein a filter box is arranged at the upper end of the support column, a discharge hole is arranged at the lower end of the filter box, a discharge channel is inlaid at the lower end of the discharge hole, the first filter screen is connected inside the filter box, a first rotating shaft is arranged in the middle of the upper end of the first filter screen, and a fixing frame is fixed at the upper end of the first rotating shaft. The invention has the beneficial effects that: the inside through the rose box is provided with the first filter screen of multilayer, and from the top down, and the mesh of the first filter screen of every layer reduces gradually, just so can carry out a lot of filtration to soil and little plastics, can enough improve the filter effect and the filter speed of the little plastics in the soil, prevents to have some little plastics to produce the overflow and leak, can carry out the layering letter sorting with the little plastics of different particle diameters again.

Description

Sorting device for different-particle-size micro-plastics in soil

Technical Field

The invention relates to the technical field of extraction of micro-plastics in soil, in particular to a sorting device for micro-plastics with different particle sizes in soil.

Background

Agricultural mulching film crushing, organic fertilizer application, sewage irrigation, sludge agriculture, atmospheric sedimentation, surface runoff and the like become sources of micro-plastics in soil, so that the micro-plastics in edible crops in the soil can be accumulated, the micro-plastics entering the soil have the risks of morphology, migration, degradation and environment, the accumulation in animals and plants, the risks of biological ecology and food chains and the risks to human health, and the micro-plastics in the soil need to be sorted and filtered out.

The little plastics sorting device can not effectually filter little plastics in soil in the current soil, and the letter sorting in-process, some soil become cubic, then can block up filter equipment, and the little plastics in the cubic soil can not filter out, leads to little plastics's filtration letter sorting efficiency to reduce, and the in-process of letter sorting can produce serious dust simultaneously, causes the pollution to the environment on every side.

Disclosure of Invention

The invention aims to provide a sorting device for micro-plastics with different particle sizes in soil, and aims to solve the problems that the existing sorting device for micro-plastics in soil, which is proposed in the background art, cannot effectively filter the micro-plastics in soil, some soil is blocked in the sorting process, the micro-plastics in the blocked soil cannot be filtered out, the filtering and sorting efficiency of the micro-plastics is reduced, and meanwhile, serious dust is generated in the sorting process to pollute the surrounding environment.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a sorting device for different particle diameter microplastics in soil, includes support column and first filter screen, the upper end of support column is provided with the rose box, and the lower extreme of rose box settles and have the discharge gate, the lower extreme of discharge gate is inlayed and is had material discharge channel, first filter screen is connected in the inside of rose box, and the upper end mid-mounting of first filter screen has first rotation axis, the upper end of first rotation axis is fixed with the mount, and the right side of mount is provided with the push pedal, the lower extreme of push pedal is settled there is the brush, the upper end of rose box is inlayed and is had the grinding case, and the inside both sides of grinding case are connected with the second rotation axis, the connecting axle is installed to the one end that the second rotation axis is close to the.

Preferably, the first filter screens are equidistantly arranged in the filter box, and the mesh diameters of the first filter screens are sequentially reduced from top to bottom.

Preferably, be fixed connection between brush and the push pedal, be fixed connection between its push pedal and the mount, and the mount constitutes revolution mechanic through first rotation axis and first filter screen.

Preferably, the cutters are equidistantly arranged on the outer wall of the connecting shaft, and the connecting shaft and the grinding box form a rotating structure through the second rotating shaft.

Preferably, the inside lower extreme of grinding case is provided with keeps off the native board, and the positive upper end of grinding case settles and have the feed inlet, the positive left side of rose box is inlayed and is had the fan, and the positive right side of rose box is connected with the ash discharge passageway, it is the mesh column structure to keep off the native board, and keeps off and be fixed connection between native board and the grinding case.

Preferably, the second filter screen is installed on the left side of the interior of the ash discharge channel, the dust fall channel is fixed on the right side of the ash discharge channel, the second filter screen is fixedly connected with the ash discharge channel, and the ash discharge channel and the fan are opposite one to one.

Preferably, the inside upper end of dust fall passageway is provided with the water spray valve, and the upper end middle part of dust fall passageway settles and have the connection valve, the inside embedding of inner wall of rose box has first axis of rotation, be fixed connection between water spray valve and the dust fall passageway, and be fixed connection between dust fall passageway and the discharge passage.

Preferably, the upper end of first axis of rotation is connected with and connects the material passageway, the internally mounted of first filter screen has the piston board, connect the one-to-one correspondence between material passageway and the piston board, and be connected for the block between piston board and the first filter screen.

Preferably, the outlet end of the material receiving channel is fixed with a second rotating shaft, the lower end of the second rotating shaft is provided with a movable baffle, a movable groove is arranged in the inner wall of the filter box, the movable baffle and the material receiving channel form a rotating structure through the second rotating shaft, and the material receiving channel and the movable groove form a rotating structure through the first rotating shaft.

Compared with the prior art, the invention has the beneficial effects that:

1. this a sorting device for different particle diameter microplastics in soil is provided with the first filter screen of multilayer through the inside of rose box, and from the top down, the mesh of the first filter screen of every layer reduces gradually, just so can carry out a lot of filtration to soil and microplastics, can enough improve the filter effect and the filter speed of the microplastics in the soil, prevents to have some microplastics to produce the overflow and leak, can carry out the layering letter sorting with the microplastics of different particle diameters again.

2. This a sorting device for different particle diameter microplastics in soil can follow the mount through push pedal and brush and rotate on first filter screen, then the push pedal just can promote soil and microplastic on first filter screen, make soil and microplastic circulate on first filter screen and remove, prevent that soil from piling up together, in order to keep soil and microplastic loose, make quick infiltration from first filter screen of soil go down, with this accelerate filter speed, and the brush when sliding on first filter screen, can clear up the mesh in first filter screen, prevent that the mesh from being blockked up, and can take off at the piston board, the micro-plastic that brush and push pedal can be quick on first filter screen pushes down.

3. This a sorting device for different particle size microplastics in soil can follow the connecting axle through the cutter and rotate at a high speed in the grinding case, then can cut the soil clod that enters into the grinding incasement, become powdered with cubic soil breakage, can make soil and microplastics carry out the initial segregation like this, thereby accelerate soil and microplastics filter speed in the filter tank, prevent that cubic soil from wrapping up monosodium glutamate, lead to inside microplastics can't be sorted out, also can avoid cubic soil to block up the second filter screen simultaneously.

4. This a sorting device for different particle diameter microplastics in soil can support soil in the grinding case through retaining the native board, makes broken powdered soil infiltration of becoming go down, and blocks massive soil in the grinding case, makes massive soil continue to carry out broken work to this guarantees that the soil that enters into in the rose box all becomes powdered, prevents to have massive soil to get into the normal filtration that influences soil.

5. This a sorting device for different particle diameter microplastics in soil can blow in the row's ash passageway with the tiny flying dust that produces in the filtering process through the fan, prevent that the flying dust from overflowing out from the discharge gate, cause the pollution to the environment on every side, simultaneously also can blow away the tiny soil ash that adheres on the microplastics, in order to improve the purity that blocks the microplastics that gets off, and when the flying dust got into in the row's ash passageway, the inside second filter screen of row's ash passageway can filter the flying dust, block the microplastics in the flying dust, prevent that tiny microplastics from following the flying dust and being blown into in the row's ash passageway, embody the device's flexibility.

6. This a sorting device for different particle diameter microplastics in soil can spray moisture to the flying dust fly ash that enters into in the dust fall passageway through the water jet valve, drenches the flying dust fly ash, makes the flying dust fly ash cohere together and subsides down to reduce the flying dust fly ash, avoid causing the pollution to the environment, and the flying dust fly ash that subsides down can follow moisture and together discharge in the discharge passageway.

7. This a sorting device for different particle diameter microplastics in soil passes through the piston board when pulling out from first filter screen, can make and form a microplastic discharging channel on the first filter screen, the rotation of push pedal and brush is coordinated again, just can sweep into discharging channel with the microplastic that blocks down, then the microplastic that is blocked down can discharge away from this discharging channel, and connect the material passageway can catch the microplastic that the seepage got off under, thereby discharge the outside of rose box with the microplastic of each layer, the ejection of compact mode of the microplastic of each layer makes like this more convenient.

8. This a sorting device for different particle diameter microplastics in soil passes through and connects the material passageway when clockwise rotation along first axis of rotation, make its exit end sink, then adjustable fender receives self gravity and focus to keep away from down all the time, with the exit end separation who connects the material passageway, the exit end that makes and connects the material passageway is open state, then soil and the microplastics that permeate down in the filtering process enter into and connect the material passageway in the back, can discharge from the exit end that connects the material passageway automatically, it remains inside to avoid soil, when the microplastics ejection of compact, connect the material passageway can be along first axis of rotation anticlockwise rotation, the exit end that will be in the rose box outside is down, then just can discharge away the microplastics that drops in connecing the material passageway.

Drawings

FIG. 1 is a schematic structural diagram of a sorting device for micro-plastics with different particle sizes in soil according to the present invention;

FIG. 2 is a right-side view schematic structural diagram of a filter box of the sorting device for micro-plastics with different particle sizes in soil according to the invention;

FIG. 3 is a schematic sectional view of a first filter screen of the sorting device for micro-plastics with different particle sizes in soil according to the present invention;

FIG. 4 is a left side view and an enlarged structure schematic diagram of a material receiving channel of the sorting device for micro-plastics with different particle sizes in soil according to the invention;

FIG. 5 is an enlarged schematic view of the location A in FIG. 4 of a sorting device for micro-plastics with different particle sizes in soil according to the present invention;

fig. 6 is a schematic top view of a first filter screen of the sorting device for micro-plastics with different particle sizes in soil according to the present invention.

In the figure: 1. a support pillar; 2. a filter box; 3. a discharge port; 4. a discharge channel; 5. a first filter screen; 6. a first rotating shaft; 7. a fixed mount; 8. pushing the plate; 9. a brush; 10. a grinding box; 11. a second rotation shaft; 12. a connecting shaft; 13. a cutter; 14. a soil guard plate; 15. a feed inlet; 16. a fan; 17. an ash discharge channel; 18. a second filter screen; 19. a dust fall channel; 20. a water spray valve; 21. connecting a valve; 22. a first rotating shaft; 23. a material receiving channel; 24. a movable groove; 25. a piston plate; 26. a second rotating shaft; 27. a movable baffle plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1-6, the present invention provides a technical solution: a sorting device for micro-plastics with different particle sizes in soil comprises a support column 1, a filter box 2, a discharge port 3, a discharge channel 4, a first filter screen 5, a first rotating shaft 6, a fixing frame 7, a push plate 8, a brush 9, a grinding box 10, a second rotating shaft 11, a connecting shaft 12, a cutter 13, a soil retaining plate 14, a feed inlet 15, a fan 16, an ash discharge channel 17, a second filter screen 18, a dust fall channel 19, a water spray valve 20, a connecting valve 21, a first rotating shaft 22, a material receiving channel 23, a movable groove 24, a piston plate 25, a second rotating shaft 26 and a movable baffle plate 27, wherein the filter box 2 is arranged at the upper end of the support column 1, the discharge port 3 is arranged at the lower end of the filter box 2, the discharge channel 4 is inlaid at the lower end of the discharge port 3, the first filter screen 5 is connected to the inside the filter box 2, and the first rotating shaft, the first filter screens 5 are arranged in the filter box 2 at equal intervals, the mesh diameters of the first filter screens 5 are sequentially reduced from top to bottom, a plurality of layers of first filter screens 5 are arranged in the filter box 2, and the mesh diameter of each layer of the first filter screen 5 is gradually reduced from top to bottom, so that soil and micro-plastics can be filtered for many times, the filtering effect and the filtering speed of the micro-plastics in the soil can be improved, part of the micro-plastics are prevented from overflowing and leaking, and the micro-plastics with different particle sizes can be sorted in a layered mode;

a fixing frame 7 is fixed at the upper end of the first rotating shaft 6, a push plate 8 is arranged at the right side of the fixing frame 7, a brush 9 is arranged at the lower end of the push plate 8, the brush 9 is fixedly connected with the push plate 8, the push plate 8 is fixedly connected with the fixing frame 7, the fixing frame 7 and the first filter screen 5 form a rotating structure through the first rotating shaft 6, the push plate 8 and the brush 9 can rotate on the first filter screen 5 along with the fixing frame 7, the push plate 8 can push soil and micro-plastic on the first filter screen 5, the soil and the micro-plastic can circularly move on the first filter screen 5 to prevent the soil from being accumulated together, so as to keep the soil and the micro-plastic loose, the soil can quickly permeate from the first filter screen 5 to accelerate the filtering speed, and when the brush 9 slides on the first filter screen 5, meshes in the first filter screen 5 can be cleaned, prevent the mesh from being blocked, and can take off at the piston plate 25, the brush 9 and the push pedal 8 can be fast pushed down the micro plastic on the first filter screen 5, the upper end of the filter box 2 is inlaid with the grinding box 10, and both sides of the interior of the grinding box 10 are connected with the second rotating shaft 11, one end of the second rotating shaft 11 close to the center line of the grinding box 10 is provided with the connecting shaft 12, and the upper end and the lower end of the connecting shaft 12 are fixed with the cutter 13, the cutter 13 is equidistantly arranged on the outer wall of the connecting shaft 12, and the connecting shaft 12 and the grinding box 10 form a rotating structure through the second rotating shaft 11, the cutter 13 can rotate at a high speed in the grinding box 10 along with the connecting shaft 12, so that the soil blocks entering the grinding box 10 can be chopped, the blocky soil can be crushed into powder, thus the soil and the micro plastic can be primarily separated, thereby accelerating the filtering speed of, the smell is prevented from being wrapped by the blocky soil, so that the inner micro-plastic cannot be sorted out, and the blocking of the second filter screen 18 by the blocky soil can be avoided;

a soil retaining plate 14 is arranged at the lower end inside the grinding box 10, a feed inlet 15 is arranged at the upper end of the front face of the grinding box 10, a fan 16 is inlaid at the left side of the front face of the filtering box 2, an ash discharge channel 17 is connected to the right side of the front face of the filtering box 2, the soil retaining plate 14 is of a mesh structure, the soil retaining plate 14 is fixedly connected with the grinding box 10, the soil retaining plate 14 can support soil in the grinding box 10 to enable the soil which is crushed into powder to permeate downwards and block the block-shaped soil in the grinding box 10, the block-shaped soil is further crushed, the soil entering the filtering box 2 is enabled to be powder, the block-shaped soil is prevented from entering and affecting normal filtration of the soil, a second filter screen 18 is arranged at the left side inside the ash discharge channel 17, a dust fall channel 19 is fixed at the right side of the ash discharge channel 17, and the second filter screen 18 is fixedly connected with the ash discharge channel 17, the dust discharge channel 17 and the fan 16 are opposite to each other, the fan 16 can blow fine flying dust generated in the filtering process into the dust discharge channel 17, the flying dust is prevented from diffusing out of the discharge port 3 to pollute the surrounding environment, fine soil dust adhered to the micro-plastic can be blown away at the same time, so that the purity of the blocked micro-plastic is improved, and when the flying dust enters the dust discharge channel 17, the second filter screen 18 in the dust discharge channel 17 can filter the flying dust, so that the micro-plastic in the flying dust is blocked, the fine micro-plastic is prevented from being blown into the dust discharge channel 17 along with the flying dust, and the flexibility of the device is embodied;

a water spray valve 20 is arranged at the upper end inside the dust falling channel 19, a connecting valve 21 is arranged in the middle of the upper end of the dust falling channel 19, a first rotating shaft 22 is embedded inside the inner wall of the filter box 2, the water spray valve 20 is fixedly connected with the dust falling channel 19, the dust falling channel 19 is fixedly connected with the discharge channel 4, the water spray valve 20 can spray moisture on fly ash entering the dust falling channel 19 to wet the fly ash, the fly ash is bonded together and sinks down, so that the fly ash is reduced, the environmental pollution is avoided, the sunk fly ash can be discharged into the discharge channel 4 along with the moisture, a material receiving channel 23 is connected to the upper end of the first rotating shaft 22, piston plates 25 are arranged inside the first filter screen 5, the material receiving channels 23 correspond to the piston plates 25 one by one, and the piston plates 25 are connected with the first filter screen 5 in a clamping manner, when the piston plate 25 is pulled out from the first filter screen 5, a micro-plastic discharging channel is formed on the first filter screen 5, the blocked micro-plastic can be swept into the discharging channel by matching with the rotation of the push plate 8 and the brush 9, the blocked micro-plastic can be discharged from the discharging channel, the material receiving channel 23 can receive the leaked micro-plastic right below, so that the micro-plastic of each layer is discharged to the outer side of the filter box 2, thus the discharging mode of the micro-plastic of each layer is more convenient, the outlet end of the material receiving channel 23 is fixed with a second rotating shaft 26, the lower end of the second rotating shaft 26 is provided with a movable baffle 27, the inner wall of the filter box 2 is internally provided with a movable groove 24, the movable baffle 27 forms a rotating structure with the material receiving channel 23 through the second rotating shaft 26, and the material receiving channel 23 forms a rotating structure with the movable groove 24 through the first rotating shaft 22, when the material receiving channel 23 rotates clockwise along the first rotating shaft 22, the outlet end of the material receiving channel is made to sink, the movable baffle plate 27 is kept away from the material receiving channel 23 by the self gravity and the gravity center all the time downward and is separated from the outlet end of the material receiving channel 23, so that the outlet end of the material receiving channel 23 is in an open state, soil and micro plastic which permeate in the filtering process enter the material receiving channel 23, the soil can be automatically discharged from the outlet end of the material receiving channel 23, the soil is prevented from remaining in the interior, when the micro plastic is discharged, the material receiving channel 23 can rotate counterclockwise along the first rotating shaft 22, the outlet end which is positioned at the outer side of the filter box 2 faces downward, and the micro plastic which falls into the material receiving channel 23 can be discharged.

The working principle of the embodiment is as follows: the sorting device for the micro-plastics with different particle sizes in the soil comprises the steps of firstly discharging the soil into a grinding box 10, opening a motor (the motor can adopt a motor with the model of SDA63X 30-B) on one side of the grinding box 10, driving a connecting shaft 12 in the grinding box 10 to rotate, driving a cutter 13 on the outer wall of the connecting shaft 12 to rotate rapidly, enabling the cutter 13 to crush the soil in the grinding box and crush the blocky soil into powder, thus enabling the soil to be separated from the micro-plastics primarily, accelerating the filtering speed of the soil and the micro-plastics in a filter box 2, preventing the blocky soil from wrapping the monosodium glutamate, preventing the internal micro-plastics from being sorted out, simultaneously avoiding the blocky soil from blocking a second filter screen 18, preventing the soil which is not powdered from being blocked by a retaining plate 14 to continue to be crushed, and preventing the powdered soil from permeating from the retaining plate 14, the penetrated soil falls on the uppermost first filter screen 5, the motors in the first filter screens 5 are respectively opened, the motors are used for driving the push plate 8 and the brush 9 to rotate on the first filter screen 5 of each layer, the push plate 8 can push the soil and the micro-plastic on the first filter screen 5 to enable the soil and the micro-plastic to circularly move on the first filter screen 5 to prevent the soil from being stacked together so as to keep the soil and the micro-plastic loose, the soil quickly penetrates from the first filter screen 5 to accelerate the filtering speed, when the brush 9 slides on the first filter screen 5, the meshes in the first filter screen 5 can be cleaned, the powder soil penetrates from the uppermost first filter screen 5 to the first filter screen 5 of the next layer, the micro-plastic with the largest volume is blocked on the first filter screen 5 of the previous layer, and the rest micro-plastic also penetrates to the first filter screen 5 of the next layer along with the soil, sequentially performing filtering and sorting from top to bottom, in the sorting process, opening all fans 16, blowing fine flying dust fly ash generated in the filtering process into corresponding dust discharge channels 17 by each layer of fan 16, preventing the flying dust fly ash from diffusing out of a discharge port 3 to pollute the surrounding environment, simultaneously blowing away fine soil ash adhered on the micro-plastics to improve the purity of the blocked micro-plastics, and when the flying dust fly ash enters the dust discharge channels 17, filtering the flying dust fly ash by a second filter screen 18 in the dust discharge channels 17 to block the micro-plastics in the flying dust fly ash, preventing the fine micro-plastics from being blown into the dust discharge channels 17 along with the flying dust fly ash, butting an external water pipe to a connecting valve 21 to enable a water spray valve 20 to start, and wetting the flying dust in the water spray dust discharge channels 17 after entering the dust discharge channels 19, flying dust is bonded together and sinks down, and then enters the discharge channel 4, soil permeated from each layer of the first filter screen 5 in the filter box 2 enters the discharge channel 4 along the discharge port 3, and because the meshes of the first filter screen 5 of each layer are gradually reduced, the soil and the micro-plastics can be filtered for many times, so that the filtering effect and the filtering speed of the micro-plastics in the soil can be improved, partial micro-plastics are prevented from overflowing and leaking, and the micro-plastics with different particle sizes can be sorted in a layered mode, so that the micro-plastics are remained on the first filter screen 5 of each layer according to the volume size, a door body on the filter box 2 is opened, a piston plate 25 in each layer of the first filter screen 5 is taken down, a through groove is formed in each layer of the first filter screen 5, and the material receiving channel 23 is manually controlled to rotate anticlockwise along the first rotating shaft 22, the material receiving channel 23 is inclined to the outer side of the filter box 2, the movable groove 24 is arranged on the filter box 2, the movable groove 24 can provide a space for the rotation of the material receiving channel 23, artificial leather is arranged inside the material receiving channel 23 and can block leaked gaps, the dust inside the filtering process is prevented from permeating out from the gaps, the motor is continuously driven to drive the push plate 8 and the brush 9 to rotate, then the micro-plastic on the first filter screen 5 of each layer is swept into the through groove and drops on the material receiving channel 23 right below the through groove, and the micro-plastic slides out of the filter box 2 along the material receiving channel 23.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a sorting device that is arranged in little plastics of different particle diameters in soil, includes support column (1) and first filter screen (5), its characterized in that: the upper end of the supporting column (1) is provided with a filter box (2), the lower end of the filter box (2) is provided with a discharge port (3), the lower end of the discharge port (3) is inlaid with a discharge channel (4), the first filter screen (5) is connected to the inside of the filter box (2), the middle part of the upper end of the first filter screen (5) is provided with a first rotating shaft (6), the upper end of the first rotating shaft (6) is fixed with a fixing frame (7), the right side of the fixing frame (7) is provided with a push plate (8), the lower end of the push plate (8) is provided with a brush (9), the upper end of the filter box (2) is inlaid with a grinding box (10), the two sides of the inside of the grinding box (10) are connected with a second rotating shaft (11), one end of the second rotating shaft (11) close to the center line of the grinding box (10) is provided with a connecting shaft, first filter screen (5) equidistance are arranged in rose box (2), and the mesh diameter of first filter screen (5) from top to bottom reduces in proper order.

2. The sorting device for the micro-plastics with different grain sizes in the soil as claimed in claim 1, wherein: the hair brush (9) is fixedly connected with the push plate (8), the push plate (8) is fixedly connected with the fixing frame (7), and the fixing frame (7) forms a rotating structure with the first filter screen (5) through the first rotating shaft (6).

3. The sorting device for the micro-plastics with different grain sizes in the soil as claimed in claim 1, wherein: the cutters (13) are arranged on the outer wall of the connecting shaft (12) at equal intervals, and the connecting shaft (12) and the grinding box (10) form a rotating structure through the second rotating shaft (11).

4. The sorting device for the micro-plastics with different grain sizes in the soil as claimed in claim 1, wherein: the grinding box is characterized in that a soil retaining plate (14) is arranged at the lower end of the interior of the grinding box (10), a feeding hole (15) is formed in the upper end of the front face of the grinding box (10), a fan (16) is inlaid in the left side of the front face of the filtering box (2), an ash discharging channel (17) is connected to the right side of the front face of the filtering box (2), the soil retaining plate (14) is of a mesh-shaped structure, and the soil retaining plate (14) is fixedly connected with the grinding box (10).

5. The sorting device for the micro-plastics with different grain sizes in the soil as claimed in claim 4, wherein: arrange grey passageway (17) inside left side and install second filter screen (18), and the right side of arranging grey passageway (17) is fixed with dust fall passageway (19), be fixed connection between second filter screen (18) and the ash discharge passageway (17), and arrange and keep one-to-one between ash discharge passageway (17) and fan (16).

6. The sorting device for the micro-plastics with different grain sizes in the soil as claimed in claim 5, wherein: the inside upper end of dust fall passageway (19) is provided with spray valve (20), and the upper end middle part of dust fall passageway (19) settles and connect valve (21), the inside embedding of inner wall of rose box (2) has first axis of rotation (22), be fixed connection between spray valve (20) and dust fall passageway (19), and be fixed connection between dust fall passageway (19) and discharge passage (4).