A device for separating and extracting soil microplastics

Abstract

The invention discloses a soil microplastic separation and extraction device, which relates to the field of microplastic separation, and comprises a separation cylinder, which is used to carry soil containing microplastics, wherein a channel is arranged at the top of the separation cylinder, a liquid replenishment system, which is used to transport flotation liquid into the separation cylinder, and the flotation liquid in the separation cylinder flows out from the channel, and a filter element, which is used to filter microplastics in the soil, and the filter element is arranged at the top of the separation cylinder; the soil microplastic separation and extraction device realizes continuous filtration of the flotation liquid by arranging the filter element in a strip shape and covering the channel cross section through which the flotation liquid flows; when part of the filter screen is blocked by microplastics, a mobile driving mechanism can quickly move the blocked filter screen part to space A, while the unblocked filter screen part continues to cover the channel cross section for filtering, thereby avoiding the cleaning or replacement problem caused by the blockage of the filter screen, and significantly improving the separation and extraction efficiency.

Description

Technical Field

[0001] The invention relates to a microplastic separation technology, and in particular to a soil microplastic separation and extraction device. Background Art

[0002] Microplastics refer to plastic fragments and particles with a diameter of less than 5 mm. They are a mixture of non-uniform plastic particles of various shapes that are difficult to distinguish with the naked eye. In the field of environmental protection and resource recycling, the separation and extraction technology of soil microplastics has received increasing attention.

[0003] The Chinese invention patent with the authorization announcement number CN109682654B discloses a device and method for extracting microplastics from soil. The device and method for extracting microplastics from soil can suspend the light-density microplastic particles mixed in the soil in the upper layer of the solution, i.e., the non-precipitation layer, by using a flotation liquid, while the heavier sediments are still in the bottom layer of the solution, i.e., the precipitation layer. Then, by continuously adding the flotation liquid, the solution in the separation tank overflows, and the microplastic particles suspended in the non-precipitation layer overflow with the solution to the annular screen and are isolated by the filter membrane on the annular screen, thereby achieving the purpose of separation.

[0004] However, in actual use, if the microplastic content in the soil is high and the single filter membrane has a small processing capacity for microplastics, the microplastics will easily clog the filter membrane during the separation and extraction process, and the flotation liquid will not be able to pass through the filter membrane or the amount of flotation liquid passing through is small, resulting in the need to clean or replace the filter membrane. The continuous usability of the device is low, which delays the separation and extraction time of microplastics in the soil and reduces the efficiency of separation and extraction. Summary of the invention

[0005] The purpose of the present invention is to provide a device for separating and extracting soil microplastics, so as to solve the technical problems in the prior art of separating and extracting microplastics in soil, that microplastics easily clog the filter membrane, the flotation liquid cannot pass through the filter membrane or the amount of flotation liquid passing through is small, resulting in the need to clean or replace the filter membrane, the continuous use of the device is low, the separation and extraction time of microplastics in soil is delayed, and the efficiency of separation and extraction is reduced.

[0006] In order to achieve the above object, the present invention provides the following technical solution: a device for separating and extracting soil microplastics, comprising:

[0007] A separation cylinder, which is used to carry soil containing microplastics, and a channel is provided at the top of the separation cylinder;

[0008] A liquid replenishing system, which is used to transport the flotation liquid into the separation cylinder, and the flotation liquid in the separation cylinder flows out from the channel;

[0009] A filter element, which is used to filter microplastics in soil. The filter element is arranged at the top of the separation cylinder. The filter element is partially located in the channel and filters the flotation liquid flowing through the channel. The filter element is arranged in a strip shape. The filter element includes a strip portion. A plurality of notches are provided on the strip portion and at equal intervals along the length direction thereof. A filter mesh for filtering the flotation liquid is provided on each of the plurality of notches.

[0010] A space is used to accommodate the filter element portion after filtering the microplastics;

[0011] Space B, which is used to accommodate the portion of the filter element that does not filter microplastics;

[0012] A blocking mechanism, which is used to block the channel;

[0013] The mobile driving mechanism is used to move the filter element. After the blocking mechanism blocks the channel, the mobile driving mechanism moves the filter element portion that has filtered the microplastics into space A, and moves the filter element portion that has not filtered the microplastics in space B into the channel to filter the flotation liquid flowing through the channel.

[0014] Furthermore, an opening A is provided on the separation cylinder for the flotation liquid to flow out, and a processing box is provided on one side of the opening A. The processing box is arranged between the A space and the B space. The side of the processing box close to the separation cylinder is fixedly connected to the separation cylinder. An opening B is provided on the processing box for the flotation liquid to flow into the inner cavity of the processing box. The inner cavity of the processing box is connected with the opening A through the opening B to form a channel.

[0015] Furthermore, a liquid outlet is provided at the bottom end of the processing box, and a valve is fixedly installed on the liquid outlet.

[0016] Furthermore, openings D are provided on the sides of the processing box close to the A space and the B space, and the openings D are used for the filter element to pass through.

[0017] Furthermore, a sealing assembly is provided, which includes two sealing frames, which are symmetrically arranged on the upper and lower sides of the filter element in the processing box, and an annular sealing strip is fixedly installed on the side where the two sealing frames are close to each other, and the outer side of the annular sealing strip is pressed against the inner side of the processing box, and one side of the two sealing frames is connected to a telescopic driving member A for driving them to move in a direction perpendicular to the surface of the filter element.

[0018] Furthermore, the fluid replenishment system includes an infusion tube A, an infusion tube B and a delivery pump, one end of the infusion tube A is connected to the bottom end of the processing box, the other end of the infusion tube A is connected to the input end of the delivery pump, one end of the infusion tube B is connected to the output end of the delivery pump, and the other end of the infusion tube B is connected to the inner cavity of the separation cylinder.

[0019] Furthermore, the blocking mechanism includes a door body and a telescopic driving member B. The door body is slidably connected to the side walls of the A opening on two opposite sides, and the door body is connected to the telescopic driving member B for driving it to move up and down.

[0020] Furthermore, the A space and the B space are each composed of an independent box body, and the two boxes are symmetrically arranged on both sides of the channel. Brackets for supporting them are fixedly installed at the bottom of the boxes, and C openings for the filter element to pass through are opened on the adjacent sides of the two boxes.

[0021] Furthermore, the mobile driving mechanism includes a winding wheel, an unwinding wheel, an A rotating driving member and a B rotating driving member. The winding wheel is arranged inside the A space, one end of the winding wheel is connected to the A rotating driving member for driving it to rotate around its own axis, and one end of the strip portion is wound around the outside of the winding wheel. The unwinding wheel is arranged inside the B space, one end of the unwinding wheel is connected to the B rotating driving member for driving it to rotate around its own axis, and the other end of the strip portion is wound around the outside of the unwinding wheel.

[0022] Furthermore, a stirring mechanism is provided, which includes a stirring blade, a stirring shaft and a C rotating drive member. The stirring blade is arranged at the bottom of the inner cavity of the separation cylinder, and the stirring blade is fixedly sleeved on the top of the stirring shaft. The bottom end of the stirring shaft passes through the separation cylinder and is connected to the C rotating drive member for driving it to rotate around its own axis. The outer wall of the stirring shaft is rotationally connected to the separation cylinder.

[0023] Compared with the prior art, the present invention provides a soil microplastic separation and extraction device, which realizes continuous filtration of the flotation liquid by setting the filter element in a strip shape and covering the channel cross section through which the flotation liquid flows. When part of the filter screen is blocked by microplastics, the mobile drive mechanism can quickly move the blocked filter screen part to space A, while the unblocked filter screen part continues to cover the channel cross section for filtering, thereby avoiding the problem of cleaning or replacement caused by the blockage of the filter screen, and significantly improving the separation and extraction efficiency;

[0024] The setting of the liquid replenishment system and the recycling of the flotation liquid realizes the recycling of the flotation liquid, effectively saving resources. At the same time, the setting of the sealing component ensures that the flotation liquid will not leak from the gap between the filter element and the inner wall of the treatment box, further ensuring the continuous and stable operation of the device;

[0025] By setting up space A and space B as independent boxes, the problem of possible contamination of the filter during movement is avoided, thereby ensuring the purity of the extracted microplastics. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of the overall external structure provided by an embodiment of the present invention;

[0028] Figure 2 A first cross-sectional structural schematic diagram provided for an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the coordination of the mobile driving mechanism, the strip portion and the filter screen provided in an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the cooperation between the strip portion and the filter screen provided in an embodiment of the present invention;

[0031] Figure 5 A second cross-sectional structural schematic diagram provided for an embodiment of the present invention;

[0032] Figure 6 A third cross-sectional structural schematic diagram provided for an embodiment of the present invention;

[0033] Figure 7 The embodiment of the present invention provides Figure 5 A is an enlarged schematic diagram;

[0034] Figure 8 A schematic diagram of the cooperation between the sealing frame and the annular sealing strip provided in an embodiment of the present invention;

[0035] Fig. 9 The embodiment of the present invention provides Figure 2 The enlarged schematic diagram of point B in FIG.

[0036] Description of reference numerals:

[0037] 1. Separation cylinder; 101. Opening A; 2. Fluid replenishment system; 21. Infusion tube A; 22. Infusion tube B; 23. Delivery pump; 3. Filter element; 31. Strip portion; 32. Filter screen; 33. Sealing frame; 34. Annular sealing strip; 35. Telescopic drive element A; 4. Space A; 5. Space B; 6. Sealing mechanism; 61. Door body; 62. Telescopic drive element B; 7. Mobile drive mechanism; 71. Winding wheel; 72. Unwinding wheel; 73. Rotary drive element A; 74. Rotary drive element B; 8. Stirring mechanism; 81. Stirring blade; 82. Stirring shaft; 83. Rotary drive element C; 9. Processing box; 91. Opening B; 92. Opening D; 10. Valve; 11. Bracket; 12. Opening C. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] See also Figures 1 to 9 , a soil microplastic separation and extraction device, comprising:

[0040] A separation cylinder 1 is used to carry soil containing microplastics, and a channel is provided at the top of the separation cylinder 1;

[0041] A liquid replenishing system 2, which is used to transport the flotation liquid into the separation cylinder 1, and the flotation liquid in the separation cylinder 1 flows out from the channel;

[0042] A filter 3 is used to filter microplastics in the soil. The filter 3 is arranged at the top of the separation cylinder 1. The filter 3 is partially in the channel and filters the flotation liquid flowing through the channel. The filter 3 is arranged in a strip shape. The filter 3 includes a strip portion 31. A plurality of notches are provided on the strip portion 31 at equal intervals along its length direction. A filter mesh 32 for filtering the flotation liquid is provided on each of the plurality of notches.

[0043] A space 4, which is used to accommodate the filter element 3 after filtering the microplastics;

[0044] B space 5, which is used to accommodate the part of the filter element 3 that does not filter microplastics;

[0045] A blocking mechanism 6, which is used to block the channel;

[0046] The mobile driving mechanism 7 is used to move the filter element 3. After the blocking mechanism 6 blocks the channel, the mobile driving mechanism 7 moves the portion of the filter element 3 that has filtered the microplastics into the A space 4, and moves the portion of the filter element 3 that has not filtered the microplastics in the B space 5 into the channel to filter the flotation liquid flowing through the channel.

[0047] When the existing separation and extraction device is used to separate and extract microplastics in soil, if the microplastic content in the soil is high, the microplastics are likely to clog the filter membrane during the separation and extraction process, and the flotation liquid cannot pass through the filter membrane or the amount of flotation liquid passing through is small, resulting in the need to clean or replace the filter membrane. The continuous use of the device is low, which delays the separation and extraction time of microplastics in the soil and reduces the efficiency of separation and extraction;

[0048] To this end, the present application arranges the filter element 3 in a strip shape and makes the filter element 3 cover the cross section of the channel through which the flotation liquid flows. During use, soil and flotation liquid containing microplastics are poured into the separation cylinder 1, and the flotation liquid is continuously input into the separation cylinder 1 through the liquid replenishment system 2. The flotation liquid in the separation cylinder 1 flows through the channel, and the filter mesh 32 on the filter element 3 filters the flotation liquid. The microplastics in the soil float up and flow through the filter mesh 32 with the flotation liquid, and the microplastics are separated on the filter mesh 32. When the microplastics block the filter mesh 32, the blocking mechanism 6 blocks the channel, and the mobile drive mechanism 7 moves the part of the filter element 3 that has filtered the microplastics into the A space 4, that is, the filter mesh 32 blocked by the microplastics is moved into the A space 4, thereby separating the microplastics separated from the soil into the A space 4;

[0049] The portion of the filter element 3 that does not filter microplastics within the B space 5 is moved to cover the cross-section of the channel through which the flotation liquid flows, that is, the filter net 32 ​​that does not filter microplastics is moved to cover the cross-section of the channel through which the flotation liquid flows to continue filtering the flotation liquid containing microplastics, thereby avoiding the need to stop the device to replace or clean the filter net 32, which leads to the problem of low sustainable usability, and effectively improves the separation and extraction efficiency of microplastics in the soil.

[0050] In one embodiment of the present invention, an A opening 101 is provided on the separation cylinder 1 for the flotation liquid to flow out, a treatment box 9 is provided on one side of the A opening 101, the treatment box 9 is provided between the A space 4 and the B space 5, the treatment box 9 is fixedly connected to the separation cylinder 1 on one side close to the separation cylinder 1, and a B opening 91 is provided on the treatment box 9 for the flotation liquid to flow into the inner cavity of the treatment box 9, and the inner cavity of the treatment box 9 is connected to the A opening 101 through the B opening 91 to form a channel;

[0051] When the liquid replenishing system 2 continuously inputs the flotation liquid into the separation cylinder 1, the flotation liquid overflows from the opening A 101 at the top of the separation cylinder 1 and the opening B 91 on the processing box 9 into the processing box 9, that is, the flotation liquid flows through the channel, thereby filtering the flotation liquid through the filter element 3.

[0052] A liquid outlet is provided at the bottom of the treatment box 9, a valve 10 is fixedly installed on the liquid outlet, and D openings 92 are provided on the sides of the treatment box 9 close to the A space 4 and the B space 5, and the D openings 92 are for the filter element 3 to pass through;

[0053] When microplastics clog the filter 32 and cause less flotation liquid to pass through, first stop the liquid replenishment system 2 from delivering flotation liquid to the separation cylinder 1, and then discharge the flotation liquid in the processing box 9 by opening the valve 10. The discharged flotation liquid is filtered flotation liquid, so as to avoid the flotation liquid from leaking from the D opening 92 on the processing box 9 when the mobile driving mechanism 7 moves the filter element 3.

[0054] In one embodiment of the present invention, a sealing assembly is further provided, the sealing assembly comprising two sealing frames 33, the two sealing frames 33 are symmetrically arranged on the upper and lower sides of the filter element 3 located in the processing box 9, an annular sealing strip 34 is fixedly installed on the adjacent side of the two sealing frames 33, the outer side of the annular sealing strip 34 is closely attached to the inner side of the processing box 9, and one side of the two sealing frames 33 is connected to a telescopic driving member 35 A for driving the two sealing frames 33 to move in a direction perpendicular to the surface of the filter element 3;

[0055] The A telescopic drive member 35 is a telescopic cylinder or a hydraulic cylinder. Two A telescopic drive members 35 are fixedly installed on the processing box 9. The moving end of one A telescopic drive member 35 is fixedly connected to the sealing frame 33 located on the upper side, and the moving end of the other A telescopic drive member 35 is fixedly connected to the sealing frame 33 located on the lower side.

[0056] The sealing frame 33 is driven to move by the A telescopic driving member 35, and when the sealing frame 33 moves, the annular sealing strip 34 can be driven to move. The two annular sealing strips 34 cooperate with each other and are tightly attached to the filter element 3. Since the outer side surface of the annular sealing strip 34 is tightly attached to the inner side surface of the processing box 9, it can be prevented that the flotation liquid leaks from the gap between the side edge of the strip portion 31 of the filter element 3 and the inner wall of the processing box 9 and the D opening 92 on the processing box 9, resulting in the problem that part of the flotation liquid is not filtered.

[0057] In one embodiment of the present invention, the infusion system 2 includes an A infusion tube 21, a B infusion tube 22 and a delivery pump 23, one end of the A infusion tube 21 is connected to the bottom end of the processing box 9, the other end of the A infusion tube 21 is connected to the input end of the delivery pump 23, one end of the B infusion tube 22 is connected to the output end of the delivery pump 23, and the other end of the B infusion tube 22 is connected to the inner cavity of the separation cylinder 1;

[0058] The delivery pump 23 pumps the filtered flotation liquid in the processing box 9 into the separation cylinder 1 through the A infusion pipe 21 and the B infusion pipe 22, so as to realize the recycling of the flotation liquid and effectively save the flotation liquid.

[0059] In one embodiment of the present invention, the blocking mechanism 6 includes a door body 61 and a B telescopic driving member 62. The door body 61 is slidably connected to the side walls of the A opening 101 on both opposite sides. The door body 61 is connected to the B telescopic driving member 62 for driving it to move up and down.

[0060] In one embodiment of the present invention, the A space 4 and the B space 5 are each composed of an independent box body, and the two boxes are symmetrically arranged on both sides of the channel. A bracket 11 for supporting the box body is fixedly installed at the bottom of the box body, and a C opening 12 for the filter element 3 to pass through is opened on the side close to the two boxes.

[0061] By setting the A space 4 and the B space 5 as independent boxes, the clogged part of the filter element 3 and the unused part of the filter element 3 are separated in two independent boxes respectively, thereby preventing the filter element 3 from being contaminated and facilitating the treatment of microplastics on the filter element 3 after the filtration is completed.

[0062] In one embodiment of the present invention, the mobile driving mechanism 7 includes a winding wheel 71, an unwinding wheel 72, an A rotating driving member 73 and a B rotating driving member 74. The winding wheel 71 is arranged inside the A space 4, one end of the winding wheel 71 is connected to the A rotating driving member 73 for driving it to rotate around its own axis, one end of the strip portion 31 is wound around the outside of the winding wheel 71, the unwinding wheel 72 is arranged inside the B space 5, one end of the unwinding wheel 72 is connected to the B rotating driving member 74 for driving it to rotate around its own axis, and the other end of the strip portion 31 is wound around the outside of the unwinding wheel 72;

[0063] The A rotary drive member 73 and the B rotary drive member 74 are rotary cylinders or motors. The output shaft end of the A rotary drive member 73 is fixedly connected to the end of the winding wheel 71. The A rotary drive member 73 is fixedly installed on the box body adjacent thereto. The output shaft end of the B rotary drive member 74 is fixedly connected to the end of the unwinding wheel 72. The B rotary drive member 74 is fixedly installed on the box body adjacent thereto.

[0064] When it is necessary to drive the filter element 3 to move, the A rotary drive member 73 and the B rotary drive member 74 are started synchronously. The A rotary drive member 73 drives the winding wheel 71 to rotate to wind up the filter element 3, and the B rotary drive member 74 drives the unwinding wheel 72 to rotate to unwind the filter element 3, thereby the filter element 3 moves and changes the positions of different filter screens 32 thereon.

[0065] In one embodiment of the present invention, a stirring mechanism 8 is further provided, and the stirring mechanism 8 includes a stirring blade 81, a stirring shaft 82 and a C rotating driving member 83. The stirring blade 81 is provided at the bottom of the inner cavity of the separation cylinder 1, and the stirring blade 81 is fixedly sleeved on the top of the stirring shaft 82. The bottom end of the stirring shaft 82 passes through the separation cylinder 1 and is connected to the C rotating driving member 83 for driving it to rotate around its own axis. The outer wall of the stirring shaft 82 is rotatably connected to the separation cylinder 1.

[0066] The C rotary drive member 83 is a rotary cylinder or a motor, the output shaft end of the C rotary drive member 83 is fixedly connected to the bottom end of the stirring shaft 82, and the C rotary drive member 83 is fixedly installed at the bottom of the separation cylinder 1;

[0067] The stirring shaft 82 is driven to rotate by the C rotating driving member 83. When the stirring shaft 82 rotates, the stirring blade 81 is driven to rotate. The stirring blade 81 stirs the soil in the separation cylinder 1, so that the soil is fully mixed with the flotation liquid, and the microplastics in the soil float, so as to improve the separation and extraction efficiency of the microplastics in the soil.

[0068] In one embodiment of the present invention, a corresponding control unit can be provided for use in conjunction with the control unit, and the control unit can select any controller to be connected to the electrical components in the present application, so as to control the opening and closing operation of each electrical component, which is the prior art;

[0069] A liquid level sensor may also be provided inside the processing box 9 to monitor the height of the flotation liquid in the processing box 9. When it is detected that the liquid level in the processing box 9 is at the bottom of the filter element 3, or when the liquid level is specifically set to be at a certain height, the liquid level sensor sends an electrical signal to the control unit. The control unit first controls the sealing component to start, so that the two annular sealing strips 34 are separated from the contact with the filter element 3, and then controls the mobile driving mechanism 7 to start, and the mobile driving mechanism 7 drives the filter element 3 to move.

[0070] Here, a single-chip microcomputer can be provided as a control unit for demonstration. The single-chip microcomputer in this embodiment is a typical embedded microcontroller unit, which is composed of an arithmetic unit, a controller, a memory, an input and output device, etc., and is equivalent to a microcomputer. Compared with the general-purpose microprocessor used in personal computers, it emphasizes self-supply (no external hardware) and cost saving. Its biggest advantage is that it is small in size and can be placed inside the instrument, but it has a small storage capacity, a simple input and output interface, and low functional consumption.

[0071] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for separating and extracting soil microplastics, characterized in that: include: A separation cylinder (1) is used to carry soil containing microplastics, and a channel is provided at the top of the separation cylinder (1); A liquid replenishing system (2) is used to transport flotation liquid into the separation cylinder (1), and the flotation liquid in the separation cylinder (1) flows out from the channel; A filter element (3) for filtering microplastics in soil, the filter element (3) being arranged at the top of the separation cylinder (1), the filter element (3) being partially located in the channel and filtering the flotation liquid flowing through the channel, the filter element (3) being arranged in a strip shape, the filter element (3) comprising a strip portion (31), a plurality of notches being provided on the strip portion (31) and at equal intervals along its length direction, and a filter net (32) for filtering the flotation liquid being provided on each of the plurality of notches; A space (4), which is used to accommodate the portion of the filter element (3) after filtering the microplastics; Space B (5), which is used to accommodate the portion of the filter element (3) that does not filter microplastics; A blocking mechanism (6) for blocking the channel; A moving drive mechanism (7) is used to move the filter element (3). After the blocking mechanism (6) blocks the channel, the moving drive mechanism (7) moves the portion of the filter element (3) that has filtered the microplastics into the A space (4), and moves the portion of the filter element (3) that has not filtered the microplastics and is located in the B space (5) into the channel to filter the flotation liquid flowing through the channel; The separation cylinder (1) is provided with an A opening (101) for the flotation liquid to flow out, a processing box (9) is arranged on one side of the A opening (101), the processing box (9) is arranged between the A space (4) and the B space (5), the side of the processing box (9) close to the separation cylinder (1) is fixedly connected to the separation cylinder (1), the processing box (9) is provided with a B opening (91) for the flotation liquid to flow into the inner cavity of the processing box (9), and the inner cavity of the processing box (9) is connected to the A opening (101) via the B opening (91) to form a channel; A sealing assembly is also provided, the sealing assembly comprising two sealing frames (33), the two sealing frames (33) being symmetrically arranged on the upper and lower sides of the filter element (3) located in the processing box (9), an annular sealing strip (34) being fixedly mounted on the adjacent sides of the two sealing frames (33), the outer side of the annular sealing strip (34) being closely attached to the inner side of the processing box (9), and one side of the two sealing frames (33) being connected to a telescopic driving member (35) for driving them to move in a direction perpendicular to the surface of the filter element (3); The mobile drive mechanism (7) comprises a winding wheel (71), an unwinding wheel (72), an A rotating drive member (73) and a B rotating drive member (74); the winding wheel (71) is arranged inside the A space (4); one end of the winding wheel (71) is connected to the A rotating drive member (73) for driving the winding wheel to rotate around its own axis; one end of the strip-shaped portion (31) is wound around the outside of the winding wheel (71); the unwinding wheel (72) is arranged inside the B space (5); one end of the unwinding wheel (72) is connected to the B rotating drive member (74) for driving the winding wheel to rotate around its own axis; and the other end of the strip-shaped portion (31) is wound around the outside of the unwinding wheel (72).

2. A soil microplastic separation and extraction device according to claim 1, characterized in that: A liquid outlet is provided at the bottom of the processing box (9), and a valve (10) is fixedly mounted on the liquid outlet.

3. The device for separating and extracting soil microplastics according to claim 1, characterized in that: The sides of the processing box (9) close to the A space (4) and the B space (5) are provided with D openings (92), and the D openings (92) are used for the filter element (3) to pass through.

4. The device for separating and extracting soil microplastics according to claim 1, characterized in that: The liquid replenishment system (2) comprises an A infusion tube (21), a B infusion tube (22) and a delivery pump (23), wherein one end of the A infusion tube (21) is connected to the bottom end of the treatment box (9), the other end of the A infusion tube (21) is connected to the input end of the delivery pump (23), one end of the B infusion tube (22) is connected to the output end of the delivery pump (23), and the other end of the B infusion tube (22) is connected to the inner cavity of the separation cylinder (1).

5. The device for separating and extracting soil microplastics according to claim 1, characterized in that: The blocking mechanism (6) comprises a door body (61) and a telescopic driving member B (62). The door body (61) is slidably connected to the side walls of the A opening (101) on opposite sides. The door body (61) is connected to the telescopic driving member B (62) for driving the door body (61) to move up and down.

6. The device for separating and extracting soil microplastics according to claim 1, characterized in that: The A space (4) and the B space (5) are each composed of an independent box body, the two boxes being symmetrically arranged on both sides of the channel, the bottom of each box body being fixedly mounted with a bracket (11) for supporting the box body, and a C opening (12) for the filter element (3) to pass through is provided on one side of the two boxes that are close to each other.

7. The device for separating and extracting soil microplastics according to claim 1, characterized in that: A stirring mechanism (8) is also provided, the stirring mechanism (8) comprising a stirring blade (81), a stirring shaft (82) and a C rotating drive member (83), the stirring blade (81) being provided at the bottom of the inner cavity of the separation cylinder (1), the stirring blade (81) being fixedly sleeved on the top of the stirring shaft (82), the bottom end of the stirring shaft (82) passing through the separation cylinder (1) and being connected to the C rotating drive member (83) for driving the stirring shaft (82) to rotate around its own axis, and the outer wall of the stirring shaft (82) being rotationally connected to the separation cylinder (1).

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