Heavy metal contaminated soil mixed remediation method for traditional Chinese medicinal material planting

Abstract

The invention provides a mixed remediation method for heavy metal contaminated soil for traditional Chinese medicinal material planting. The mixed remediation method specifically comprises the following steps that 1, plot ploughing is conducted, 2, soil mixing is conducted, microbial strains and a heavy metal treating agent are added into soil, and the heavy metal treating agent and the microbial strains are mixed and stirred with the soil through mixing equipment. According to the mixed remediation method for the heavy metal contaminated soil for traditional Chinese medicine planting, during use, after the soil enters the circular cavity, the heating mechanism generates high temperature, moisture in the soil is rapidly evaporated and discharged through the high temperature, later crushing is facilitated after the soil is dried, and crushing rollers shake up and down to complete crushing at different positions when crushing the soil; when the crushing roller moves up and down, the rotating seat moves up and down, so that the soil quantitatively falls off between the ring seats, and the soil and an additive are sufficiently mixed in the later period.

Description

Technical Field

[0001] The present invention relates to the field of soil remediation equipment, and specifically to a method for mixed remediation of heavy metal-contaminated soil for Chinese herbal medicine planting. Background Art

[0002] Soil heavy metal pollution has become a major problem faced by the global environmental quality. When the heavy metals entering the environment exceed their capacity in the environment, heavy metal pollution can occur. Heavy metal pollutants are persistent pollutants, and the harm to the environment and human body is difficult to eliminate. Before planting Chinese herbal medicines, it is necessary to remediate the heavy metal-contaminated soil. After soil remediation, it provides the required environment for the planting of Chinese herbal medicines. When remediating the soil, it is necessary to mix additives with the soil through a mixing device to achieve purification treatment.

[0003] According to a patent document with the publication number CN221269273U, a device for mixed remediation of heavy metal-contaminated soil is disclosed. It includes a mixing tank, a feeding port arranged at the top of the mixing tank, and a discharging port arranged at the bottom of the mixing tank. A bracket is fixedly installed inside the mixing tank, and a double-headed motor is fixedly installed on the bracket. One end of the output shaft of the double-headed motor close to the feeding port is fixedly installed with a grinding roller, and grinding blocks are fixedly installed on both sides of the grinding roller on the inner wall of the mixing tank. When this technical solution is used, through the coordinated work of the bracket, double-headed motor, grinding roller, grinding blocks, rotating rod, stirring roller, and blades, the soil can be crushed, stirred, and mixed, with good crushing effect and improved soil mixing and remediation effect. For the above technical solution, although the soil is crushed, the moisture in the soil cannot be quickly evaporated before crushing. The wet soil is not convenient for sufficient crushing, and the discharge amount of the soil after crushing cannot be controlled during crushing, and the additives cannot be evenly added to the soil, which is inconvenient in use. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method for mixed remediation of heavy metal-contaminated soil for Chinese herbal medicine planting to solve the problems raised in the above background art. The structure of the present invention is novel. When in use, after the soil enters the inner part of the circular cavity, the heating mechanism generates high temperature, and the high temperature quickly evaporates and discharges the moisture in the soil. After the soil is dried, it is convenient for subsequent crushing. When the crushing roller crushes the soil, it shakes up and down to complete crushing at different positions. When the crushing roller moves up and down, the rotating seat moves up and down to make the soil drop quantitatively from between the ring seats, which is convenient for subsequent full mixing of the soil and additives.

[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions: A method for mixed remediation of heavy metal-contaminated soil for Chinese herbal medicine planting specifically includes the following steps:

[0006] Step 1: Plowing the plot;

[0007] Step 2: Soil mixing. Microbial strains and heavy metal treatment agents are added to the soil, and the heavy metal treatment agents and microbial strains are mixed and stirred with the soil through a mixing device.

[0008] Step 3: Cover the isolation layer. A degradable polylactic acid plastic film is covered in the deep pit to form an isolation layer.

[0009] Step 4: Backfill the soil. The mixed soil is backfilled into the deep pit.

[0010] Step 5: Watering and film covering. After watering, film covering is carried out to achieve soil conservation. Better effects can be achieved by conserving for 7 - 10 days or one to two weeks.

[0011] Step 6: Plant medicinal materials. After removing the film, plant traditional Chinese medicinal materials.

[0012] Furthermore, in Step 1, the heavy metal - contaminated plot is dug 30 cm deep, and the excavated soil is reserved. In Step 2, the microbial strains include Bacillus subtilis, Bacillus cereus, Lactobacillus, which are compounded and applied with a soil conditioner. On the one hand, the functional bacteria independently screened in the laboratory can synergistically reduce and passivate heavy metals, and on the other hand, they can improve the soil micro - environment.

[0013] Furthermore, the heavy metal treatment agents in Step 2 include substances such as iron powder, biochar, humic acid, organosilicon, and trace element fertilizers, which are environmentally friendly, non - toxic, and replace conventional materials such as steel slag and fly ash. Their effects are: on the one hand, passivating soil heavy metals, and on the other hand, improving soil texture, acid improvement, and increasing soil fertility.

[0014] Furthermore, the mixing device in Step 2 includes a box body. A positioning column is fixed on the top of the box body. A movable seat is movably installed on the positioning column. A positioning hole is opened on the movable seat, and the positioning column is movably installed inside the positioning hole. The movable seat is installed on the top of the box body through a support mechanism. A fixed column is fixed on the movable seat, and a driving motor is fixedly installed on the fixed column. A rotating column is installed on the driving motor, and the rotating column is movably installed inside the box body. A lifting mechanism is fixed on the top of the box body.

[0015] Furthermore, an installation seat is fixed on the top of the lifting mechanism. A rotating motor is fixedly installed on the installation seat. A cam is installed on the rotating motor, and the cam is movably in contact with the top of the movable seat. A connecting plate is welded to the bottom of the movable seat. A threaded column is rotatably installed on the connecting plate. A movable plate is movably installed on the side of the box body.

[0016] Furthermore, a movable disk is movably installed at one end of the threaded column. An extrusion cylinder is movably installed at the bottom of the movable disk, and the extrusion cylinder is fixedly installed on the top of the box body. A positioning component is fixedly installed between the connecting plate and the box body.

[0017] Further, a piston seat is movably installed inside the extrusion cylinder. An active column is fixed on the piston seat. One end of the active column is fixed on the active disk. A reset mechanism is fixed on the piston seat. One end of the reset mechanism is fixed on the inner wall of the extrusion cylinder. A limiting hole is formed in the active disk. One end of the threaded column is movably installed inside the limiting hole.

[0018] Further, a water tank and a feed hopper are fixed on the top of the box body. A water supply pipe is fixed on the side of the water tank. One end of the water supply pipe is fixed on the extrusion cylinder. A drain pipe is fixed on the side of the extrusion cylinder. A shunt pipe is fixedly installed between the drain pipe and the box body. A control valve is fixedly installed on the shunt pipe. One-way valves are fixedly installed at one ends of the water supply pipe and the drain pipe.

[0019] Further, a circular cavity is formed inside the box body. A crushing roller is rotatably installed inside the circular cavity. One end of the crushing roller is welded on the rotating column. One end of the rotating column is fixed with a rotating seat. An annular seat is fixed on the inner wall of the circular cavity. A first annular pipe is fixedly installed inside the annular seat. Spraying holes are fixedly installed between the first annular pipe and the annular seat. A conical seat is fixed inside the box body.

[0020] Further, a scraper is movably installed on the side of the conical seat. A cross bar is welded between the scrapers. A connecting column is welded on the cross bar. One end of the connecting column is movably installed with a support column. One end of the support column is welded on the bottom of the rotating seat. A fixing hole is formed inside the support column. A limiting block is welded on the side of the fixing hole. A limiting groove is formed in the connecting column. The limiting block is movably installed inside the limiting groove. A discharge port is formed at one end of the conical seat. A second annular pipe is fixedly installed between the discharge port and the box body. Atomizing nozzles are fixedly installed on the second annular pipe.

[0021] Advantages of the present invention:

[0022] 1. For the method for mixed remediation of heavy metal contaminated soil for Chinese herbal medicine planting, when the crushing roller crushes the soil, it shakes up and down to complete crushing at different positions. When the crushing roller moves up and down, the rotating seat moves up and down to make the soil drop quantitatively between the annular seats, which is convenient for the subsequent full mixing of the soil and the additive.

[0023] 2. For the method for mixed remediation of heavy metal contaminated soil for Chinese herbal medicine planting, when the soil drops through the annular seat, liquid is sprayed out through the first annular pipe to quickly adsorb the additive into the soil for rapid mixing. Later, liquid is sprayed through the second annular pipe to complete secondary addition. At the same time of secondary addition, the soil is wetted. When the wetted soil is discharged, a large amount of dust is avoided.

[0024] 3. The mixed repair method for heavy metal contaminated soil used for Chinese medicinal materials planting, when the cam rotates to push the movable seat to move up and down, the movable seat squeezes the movable disk through the connecting plate, and the movable disk pushes the piston seat to move up and down. The piston seat moves up and down to squeeze and discharge the liquid quantitatively. Later, the threaded column rotates up and down to adjust the distance between the threaded column and the movable disk. Under the control of the threaded column, the distance of the piston seat moving up and down is adjusted, thereby quantitatively adjusting the liquid for spraying, and completing the mixed use in different proportions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the mixed remediation method for heavy metal-contaminated soil used for Chinese medicinal material planting according to the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the mixing equipment of the method for mixing and repairing heavy metal-contaminated soil for Chinese medicinal material planting according to the present invention;

[0027] Figure 3 This is a schematic diagram of the structure after the feed hopper of the mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting of the present invention is removed;

[0028] Figure 4 It is a schematic structural diagram of point A after enlarging the mixed remediation method of heavy metal-contaminated soil for Chinese medicinal material planting of the present invention;

[0029] Figure 5 It is a schematic structural diagram of the extrusion cylinder after being cut open in the mixed remediation method for heavy metal-contaminated soil for Chinese medicinal material planting of the present invention;

[0030] Figure 6 It is a schematic diagram of the side cross-sectional structure of a box used in the mixed remediation method of heavy metal-contaminated soil for Chinese medicinal material planting according to the present invention;

[0031] Figure 7 This is a schematic structural diagram of point B after enlargement of the mixed remediation method for heavy metal-contaminated soil for Chinese medicinal material planting of the present invention;

[0032] Figure 8 It is a schematic diagram of the top view of the conical seat used in the mixed remediation method of heavy metal-contaminated soil for Chinese medicinal material planting according to the present invention;

[0033] In the figure: 1. Box body; 2. Movable plate; 3. Water tank; 4. Water supply pipe; 5. Feeding hopper; 6. Drain pipe; 7. Shunt pipe; 8. Positioning column; 9. Movable seat; 10. Support mechanism; 11. Fixed column; 12. Driving motor; 13. Connecting plate; 14. Threaded column; 15. Movable disk; 16. Extrusion cylinder; 17. Mounting seat; 18. Rotating motor; 19. Cam; 20. Lifting mechanism; 21. Piston seat; 22. Movable column; 23. Reset mechanism; 24. Limiting hole; 25. Circular cavity; 27. Positioning hole; 28. Rotating column; 29. Crushing roller; 30. Rotating seat; 31. Ring seat; 32. First ring pipe; 33. Conical seat; 34. Scraper; 35. Cross bar; 36. Discharge port; 37. Second ring pipe; 38. Support column; 39. Fixed hole; 40. Connecting column; 41. Limiting groove; 42. Limiting block. Detailed implementation manners

[0034] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0035] Please refer to Figures 1 to 8 , the present invention provides a technical solution: a method for mixed remediation of heavy metal contaminated soil for traditional Chinese medicine planting, which is characterized in that: specifically includes the following steps:

[0036] Step 1. Plowing the plot;

[0037] Step 2. Soil mixing, adding microbial strains and heavy metal treatment agents to the soil, and mixing and stirring the heavy metal treatment agents and microbial strains with the soil through a mixing device;

[0038] Step 3. Covering the isolation layer, covering a biodegradable polylactic acid plastic film in the deep pit to form an isolation layer;

[0039] Step 4. Backfilling the soil, backfilling the mixed soil into the deep pit;

[0040] Step 5. Watering and covering the film, covering the film after watering for soil maintenance, and better effects can be achieved by maintaining for 7-10 days or one to two weeks;

[0041] Step 6. Planting traditional Chinese medicine, removing the film and then planting traditional Chinese medicine.

[0042] 2. The heavy metal contaminated soil mixed remediation method for traditional Chinese medicine planting according to claim 1, characterized in that: in step one, the heavy metal contaminated plot is dug 30 cm deep, and the excavated soil is reserved; in step two, the microbial strains include Bacillus subtilis, Bacillus cereus, Lactobacillus and soil conditioner are compounded and applied. On the one hand, the functional bacteria independently screened in the laboratory can synergistically reduce and passivate heavy metals, and on the other hand, it can improve the soil microenvironment. In step two, the heavy metal treatment agent includes substances such as iron powder, biochar, humic acid, silicone, trace element fertilizer, etc., which are environmentally friendly and non-toxic, and replace conventional materials such as steel slag and fly ash. Its effects are: on the one hand, passivate soil heavy metals, and on the other hand, improve soil texture, acid improvement, and increase fertility.

[0043] 4. The heavy metal contaminated soil mixed remediation method for traditional Chinese medicine planting according to claim 1, characterized in that: the mixing device in step two includes a box body 1, a positioning column 8 is fixed on the top of the box body 1, a movable seat 9 is movably installed on the positioning column 8, a positioning hole 27 is opened on the movable seat 9, the positioning column 8 is movably installed inside the positioning hole 27, the movable seat 9 is installed on the top of the box body 1 through a support mechanism 10, a fixed column 11 is fixed on the movable seat 9, a driving motor 12 is fixedly installed on the fixed column 11, a rotating column 28 is installed on the driving motor 12, the rotating column 28 is movably installed inside the box body 1, a lifting mechanism 20 is fixed on the top of the box body 1. The lifting mechanism 20 is a linear reciprocating electric push rod, and the lifting mechanism 20 controls the up and down movement of the mounting seat 17. The up and down movement of the mounting seat 17 controls the cooperation state between the cam 19 and the movable seat 9. The top of the lifting mechanism 20 is fixed with a mounting seat 17, a rotating motor 18 is fixedly installed on the mounting seat 17, a cam 19 is installed on the rotating motor 18, the cam 19 is movably in contact with the top of the movable seat 9, a connecting plate 13 is welded to the bottom of the movable seat 9, a threaded column 14 is rotatably installed on the connecting plate 13, a movable plate 2 is movably installed on the side of the box body 1. The connecting plate 13 is pushed by the movable seat 9 to complete the extrusion of the movable disk 15, and the movable disk 15 is extruded to push the liquid at the bottom outwards through the piston seat 21.

[0044] In this embodiment, a movable disk 15 is movably installed at one end of the threaded column 14. A pressing cylinder 16 is movably installed at the bottom of the movable disk 15. The pressing cylinder 16 is fixedly installed on the top of the box body 1. A positioning component is fixedly installed between the connecting plate 13 and the box body 1. A piston seat 21 is movably installed inside the pressing cylinder 16. An active column 22 is fixed on the piston seat 21. One end of the active column 22 is fixed on the movable disk 15. A reset mechanism 23 is fixed on the piston seat 21. The reset mechanism 23 is a reset spring. The reset spring moves upward after the movable disk 15 loses extrusion. When the movable disk 15 moves upward, the piston seat 21 rises synchronously. When the piston seat 21 rises, the liquid inside the water tank 3 is extracted through the water supply pipe 4 for replenishment. One end of the reset mechanism 23 is fixed on the inner wall of the pressing cylinder 16. A limiting hole 24 is formed in the movable disk 15. One end of the threaded column 14 is movably installed inside the limiting hole 24. A water tank 3 and a feeding hopper 5 are fixedly installed on the top of the box body 1. A water supply pipe 4 is fixed on the side of the water tank 3. One end of the water supply pipe 4 is fixed on the pressing cylinder 16. A drain pipe 6 is fixed on the side of the pressing cylinder 16. A shunt pipe 7 is fixedly installed between the drain pipe 6 and the box body 1. A control valve is fixedly installed on the shunt pipe 7. One-way valves are fixedly installed at one ends of the water supply pipe 4 and the drain pipe 6. When the piston seat 21 moves upward, the drain pipe 6 stops supplying water upward. Under the suction of the pressure, the liquid enters the bottom of the piston seat 21 from the water supply pipe 4 for liquid replenishment, which is convenient for the next extrusion and discharging use.

[0045] In this embodiment, a circular cavity 25 is formed inside the box body 1. A crushing roller 29 is rotatably installed inside the circular cavity 25. One end of the crushing roller 29 is welded to a rotating column 28. One end of the rotating column 28 is fixed with a rotating seat 30. An annular seat 31 is fixed on the inner wall of the circular cavity 25. A first annular pipe 32 is fixedly installed inside the annular seat 31. Spraying holes are fixedly installed between the first annular pipe 32 and the annular seat 31. A conical seat 33 is fixed inside the box body 1. A scraper 34 is movably installed on the side of the conical seat 33. A cross bar 35 is welded between the scrapers 34. A connecting column 40 is welded on the cross bar 35. One end of the connecting column 40 is movably installed with a support column 38. One end of the support column 38 is welded to the bottom of the rotating seat 30. A fixing hole 39 is formed inside the support column 38. A limiting block 42 is welded on the side of the fixing hole 39. A limiting groove 41 is formed on the connecting column 40. The limiting block 42 is movably installed inside the limiting groove 41. A discharge port 36 is formed at one end of the conical seat 33. A second annular pipe 37 is fixedly installed between the discharge port 36 and the box body 1. Atomizing nozzles are fixedly installed on the second annular pipe 37. When the rotating seat 30 moves upward in the later stage, the support column 38 moves on the connecting column 40. During the movement adjustment, the power transmission is completed through the cooperation of the limiting block 42 and the limiting groove 41. The scraper 34 rotates on the conical seat 33 to facilitate scraping and cleaning the surface of the conical seat 33. An electric heating wire is fixedly installed inside the conical seat 33. The electric heating wire is energized to generate high temperature on the surface of the conical seat 33 to quickly evaporate the internal moisture and ensure the dryness of the soil.

[0046] When the device is in use, the heavy metal treatment agent and water are stirred and mixed and then added into the interior of the water tank 3. The soil enters into the interior of the circular cavity 25 through the feed hopper 5. The driving motor 12 is started to drive the crushing roller 29 to rotate at a high speed. The crushing roller 29 under high-speed rotation completes the rapid crushing of the soil. While crushing, the lifting mechanism 20 is started to drive the mounting seat 17 to move downward. The downward movement of the mounting seat 17 causes the cam 19 to rotate. The rotating motor 18 drives the cam 19 to rotate and contact with the movable seat 9. When the convex position of the cam 19 contacts the movable seat 9, the height of the cam 19 is controlled by the lifting mechanism 20. The change in the height of the cam 19 adjusts the distance of the up-and-down movement of the movable seat 9, thereby completing the adjustment of the moving distance of the crushing roller 29. The cam 19 pushes the movable seat 9 to move downward. The movable seat 9 moves vertically on the positioning column 8. When the movable seat 9 moves downward, the driving motor 12 moves simultaneously. When the driving motor 12 moves, the rotating column 28 and the crushing roller 29 change the position of the crushing point. The up-and-down movement of the crushing roller 29 rapidly crushes the soil blocks at different positions. When the movable seat 9 moves up and down, the connecting plate 13 pushes the movable disk 15 to move downward. When the movable disk 15 moves downward, the piston seat 21 pushes the liquid at the bottom into the interior of the drain pipe 6. Under the push of the extrusion force, the liquid is ejected from the first annular pipe 32 and the second annular pipe 37 simultaneously. Of course, the use positions of the first annular pipe 32 and the second annular pipe 37 are controlled by the control valve. When the rotating column 28 moves up and down, the rotating seat 30 moves simultaneously. After the rotating seat 30 moves, the opening between the ring seats 31 opens. The soil slides down from the side of the rotating seat 30 and falls downward between the ring seats 31. When the soil passes between the ring seats 31, the first annular pipe 32 sprays the liquid through the spraying holes to contact the soil. The dried soil quickly adsorbs the liquid, enabling the liquid additive to quickly enter into the interior of the soil. The soil falls on the conical seat 33 through the ring seats 31. Under the scraping and pushing of the scraper 34, the soil is discharged downward from the discharge port 36. When the soil is discharged, the second annular pipe 37 sprays the liquid again to wet the soil, avoiding the influence caused by dust generation during the discharge of the soil.

[0047] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0048] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mixed remediation method for heavy metal-contaminated soil for Chinese medicinal material planting, characterized in that: The specific steps include: Step 1: ploughing the land; Step 2: soil mixing: adding microbial strains and heavy metal treatment agents to the soil, and mixing the heavy metal treatment agents and microbial strains with the soil through a mixing device; Step 3: Covering the isolation layer: covering the deep pit with a degradable polylactic acid plastic film to form an isolation layer; Step 4: Backfill the soil and fill the mixed soil into the deep pit; Step 5: Water and cover the soil. Cover the soil with film after watering to maintain the soil. Better results can be achieved by maintaining the soil for 7-10 days or one to two weeks. Step six: Plant medicinal materials and remove the covering film before planting Chinese medicinal materials.

2. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 1, characterized in that: In the step 1, the heavy metal contaminated land is excavated to a depth of 30 cm, and the excavated soil is reserved. In the step 2, the microbial strains including Bacillus subtilis, Bacillus cereus, and Lactobacillus are compounded and applied with soil conditioners. On the one hand, the functional bacteria independently screened by the laboratory can synergistically reduce and passivate heavy metals, and on the other hand, they can improve the soil microenvironment.

3. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 1, characterized in that: The heavy metal treatment agent in step 2 includes iron powder, biochar, humic acid, organosilicon, trace element fertilizer and other substances, which are environmentally friendly and non-toxic, and can replace conventional materials such as steel slag and fly ash. Its effects are: on the one hand, it can passivate soil heavy metals, and on the other hand, it can improve soil texture, acidity and increase fertility.

4. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 1, characterized in that: The mixing equipment in step 2 includes a box body, a positioning column is fixed on the top of the box body, a movable seat is movably installed on the positioning column, a positioning hole is opened on the movable seat, the positioning column is movably installed inside the positioning hole, the movable seat is installed on the top of the box body through a supporting mechanism, a fixed column is fixed on the movable seat, a driving motor is fixedly installed on the fixed column, a rotating column is installed on the driving motor, the rotating column is movably installed inside the box body, and a lifting mechanism is fixed on the top of the box body.

5. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 4, characterized in that: A mounting seat is fixed on the top of the lifting mechanism, a rotating motor is fixedly mounted on the mounting seat, a cam is mounted on the rotating motor, the cam movably contacts the top of the movable seat, a connecting plate is welded on the bottom of the movable seat, a threaded column is rotatably mounted on the connecting plate, and a movable plate is movably mounted on the side of the box.

6. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 5, characterized in that: A movable disk is movably mounted on one end of the threaded column, an extrusion cylinder is movably mounted on the bottom of the movable disk, the extrusion cylinder is fixedly mounted on the top of the box body, and a positioning assembly is fixedly mounted between the connecting plate and the box body.

7. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 6, characterized in that: A piston seat is movably installed inside the extrusion cylinder, a movable column is fixed on the piston seat, one end of the movable column is fixed on the movable disk, a reset mechanism is fixed on the piston seat, one end of the reset mechanism is fixed on the inner wall of the extrusion cylinder, a limiting hole is opened on the movable disk, and one end of the threaded column is movably installed inside the limiting hole.

8. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 4, characterized in that: A water tank and a feed hopper are fixed on the top of the box body, a water supply pipe is fixed on the side of the water tank, one end of the water supply pipe is fixed on the extrusion cylinder, a drain pipe is fixed on the side of the extrusion cylinder, a diverter pipe is fixedly installed between the drain pipe and the box body, a control valve is fixedly installed on the diverter pipe, and one end of the water supply pipe and the drain pipe are fixedly installed with a one-way valve.

9. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 1, characterized in that: A circular cavity is opened inside the box body, a crushing roller is rotatably installed inside the circular cavity, one end of the crushing roller is welded to a rotating column, a rotating seat is fixed to one end of the rotating column, a ring seat is fixed on the inner wall of the circular cavity, a first ring tube is fixedly installed inside the ring seat, a spraying hole is fixedly installed between the first ring tube and the ring seat, and a conical seat is fixed inside the box body.

10. The mixed remediation method for heavy metal contaminated soil for Chinese medicinal material planting according to claim 9, characterized in that: A scraper is movably installed on the side of the conical seat, a cross bar is welded between the scrapers, a connecting column is welded on the cross bar, a support column is movably installed on one end of the connecting column, one end of the support column is welded to the bottom of the rotating seat, a fixing hole is opened inside the support column, a limiting block is welded on the side of the fixing hole, a limiting groove is opened on the connecting column, the limiting block is movably installed inside the limiting groove, a discharge port is opened at one end of the conical seat, a second ring pipe is fixedly installed between the discharge port and the box body, and an atomizing nozzle is fixedly installed on the second ring pipe.

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