Ecological remediation device for heavy metal contaminated soil

Abstract

The invention discloses a heavy metal contaminated soil ecological restoration device which comprises a self-propelled tracked vehicle, a plate frame is installed on a vehicle body of the self-propelled tracked vehicle, a lifting beam is vertically fixed to one side of the plate frame, and a transferring frame is installed on the lifting beam in a sliding mode; a drill rod body is vertically arranged on the end face of one side of the transfer frame, a conveying cylinder is installed on the transfer frame, a plurality of injection units are distributed on the surface of the drill rod body at equal intervals in the axial direction of the drill rod body, and a center shaft rod is coaxially connected into the drill rod body. Two adjusting plates are symmetrically and rotationally connected to one side of the lower end of the lifting beam, and a plurality of soil vibrating mechanisms are distributed on the adjusting plates; supercritical CO2 and a chelating agent are mixed according to the proportion and then conveyed to the injection and conveying units through the flow guide channels, the injection and conveying units efficiently inject the supercritical CO2 carrying the chelating agent into soil micropores, efficient extraction of the heavy metal contaminated soil is achieved through the gas-level permeability of the supercritical CO2, and efficient dissociation of heavy metal pollution at different depths is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil ecological restoration, and in particular relates to a device for ecological restoration of heavy metal-contaminated soil. Background Art

[0002] At present, conventional soil ecological restoration devices mainly use physical, chemical, biological or combined methods to repair contaminated soil. For example, mechanical stirring is used to repair the soil, and the repaired soil is covered in the repair area. Although the repair efficiency is high, this will destroy the soil aggregate structure and cause organic matter loss. Long-term ecological reconstruction is required after repair. Some soil leaching systems use leaching liquid preparation tanks to inject the agent into the soil through injection wells. However, due to the limitations of soil porosity and clay content, they can usually only effectively act on a shallow layer of about 1 meter and cannot reach deeper contaminated areas.

[0003] Therefore, it is necessary to provide a heavy metal contaminated soil ecological restoration device to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a heavy metal contaminated soil ecological restoration device, comprising: a self-propelled crawler vehicle, a plate frame mounted on the vehicle body, a lifting beam vertically fixed to one side of the plate frame, and a transfer frame slidably mounted on the lifting beam; A drill rod body is vertically arranged on one end surface of the transfer frame, a conveying cylinder is installed on the transfer frame, the drill rod body and the conveying cylinder are coaxially arranged, and a plurality of injection units are evenly distributed along the axial direction of the drill rod body. A central shaft is coaxially connected to the drill rod body; One side of the lower end of the lifting beam is symmetrically connected to two adjustment plates for rotation, and a plurality of soil vibrating mechanisms are distributed on the adjustment plates.

[0005] Further, as a preference, a bevel gear is fixed to the end of each of the adjustment plates, the lower end surface of the lifting beam is connected to a transmission rod for transverse rotation, the ends of the transmission rods are fixed with bevel gears, and the bevel gears are meshed with the bevel gears for transmission; A driving part is provided on the lower end surface of the lifting beam, and the driving part is connected to the transmission rod through a transmission belt for transmission.

[0006] Further, as a preference, the soil vibrating mechanism includes a mounting frame, one end surface of which is slidably provided with a driving plate, a vertically arranged hydraulic lifting rod is fixed to the driving plate, a loading seat is fixed to the lower end surface of the hydraulic lifting rod, and a chassis is horizontally provided on the lower end surface of the loading seat; A connecting plate is slidably provided in the loading seat, and the connecting plate is fixed to the chassis via a plurality of vertically arranged side rods. Limiting springs are symmetrically connected to the connecting plate, and a fixing plate is connected between the limiting springs. A linear vibrator is provided in the loading seat, and an output end of the linear vibrator is connected to the fixing plate.

[0007] Furthermore, preferably, a negative pressure cavity is provided in the chassis, and a plurality of suction holes are provided below the negative pressure cavity.

[0008] Further, as a preference, a positioning frame is fixed on the transfer rack, the conveying cylinder is fixed in the positioning frame, a connecting pipe is vertically connected to the lower end surface of the conveying cylinder, a side pipe is connected to the side wall of the connecting pipe, an injection pipe group is provided in the positioning frame, and the injection pipe group is connected to the side pipe; A guide channel is provided in the central shaft, the connecting pipe is sealedly connected to the guide channel, and each of the injection units is connected to the connecting pipe through the guide channel; A bidirectional motor is installed above the conveying cylinder, and the output end of the bidirectional motor is connected to the central shaft.

[0009] Furthermore, preferably, supercritical CO2 is transported in the injection pipe group; a feed pipe is connected to one side of the delivery cylinder, and a chelating agent is transported in the feed pipe.

[0010] Further, as a preference, the injection unit includes a rotating shaft seat, which is constructed as a spherical structure and is embedded and rotatably arranged in the drill rod body, the arm of the central shaft is provided with a spherical protrusion, and the rotating shaft seat and the spherical protrusion are arranged concentrically; A plurality of pressure rings are distributed on the side wall of the rotating shaft seat along the radial circumference of the drill pipe body. The pressure rings are all slidably connected to the rotating shaft seat, and a return spring is connected between the pressure rings and the rotating shaft seat; A nozzle is fixed in the pressure ring sleeve, an annular groove is opened in the rotating shaft seat, and the annular groove is connected with one end of each nozzle; the spherical protrusion of the central shaft is provided with multiple discharge ports.

[0011] Furthermore, as a preferred embodiment, a ball is connected to the nozzle through a pressure spring, and the pressure spring pushes the ball into the nozzle under the elastic force; Each of the injection units uses pressure springs of different or same specifications.

[0012] Furthermore, preferably, a ratchet is fixed on the central shaft, and a plurality of pawls are distributed in the drill rod body, and the drill rod body is engaged with the ratchet and the pawls so that the central shaft rotates synchronously with the drill rod body in reverse rotation; An eccentric block is sleeved on the central shaft and located above the rotating shaft seat.

[0013] Furthermore, as a preference, a swash plate is fixed on the central shaft, a top plate is fixed to the upper end of the rotating shaft seat, and the lower end inclined surface of the swash plate is in contact with the top plate; A flow expansion groove is provided on the spherical protrusion of the central shaft at the discharge port. The cross section of the flow expansion groove is an arc-shaped structure. The annular groove is always sealed and connected with each of the flow expansion grooves.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, repair holes are pre-drilled in the soil in the heavy metal contaminated soil remediation area, and the drill rod body on the transfer frame can be drilled into the repair hole. A central shaft is provided in the drill rod body, and a diversion channel is provided inside the drill rod body. The injection pipe group outside the connecting pipe can mix supercritical CO2 and chelating agent in proportion and then transport them to each injection unit through the diversion channel. The injection unit efficiently injects supercritical CO2 carrying chelating agent into the soil micropores, and utilizes the gas-level permeability of supercritical CO2 to ensure seepage and diffusion in the soil layer, thereby realizing efficient extraction of heavy metal contaminated soil; and a soil vibrating mechanism is also provided on the lifting beam, which can provide soil vibration and loosening through a linear vibrator, thereby realizing efficient dissociation of heavy metal pollution in the deep soil layer at a depth of 0 to 5m. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the structure of the soil vibrating mechanism in the present invention; Figure 3 Schematic diagram of the internal structure of the loading seat in the present invention; Figure 4 Schematic diagram of the internal structure of the connecting pipe in the present invention; Figure 5 It is a structural schematic diagram of the injection unit in the present invention.

[0016] In the figure: 1. Plate frame; 11. Lifting beam; 12. Transfer frame; 13. Drill rod body; 14. Central shaft; 15. Adjustment plate; 16. Transmission rod; 2. Conveying cylinder; 21. Positioning frame; 22. Connecting pipe; 23. Side pipe; 24. Injection pipe group; 25. Diversion channel; 26. Bidirectional motor; 27. Feed pipe; 3. Vibrating soil mechanism; 31. Mounting frame; 32. Hydraulic lifting rod; 33. Loading seat; 34. Chassis; 35. Connecting plate; 36. Side rod; 37. Limit spring; 38. Linear vibrator; 39. Negative pressure chamber; 4. Injection unit; 41. Rotating shaft seat; 42. Pressure ring; 43. Nozzle; 44. Annular groove; 45. Exhaust port; 46. Ball; 47. Ratchet; 48. Eccentric block; 5. Inclined plate; 51. Diffuser. DETAILED DESCRIPTION

[0017] See also Figure 1-Figure 5In an embodiment of the present invention, a heavy metal contaminated soil ecological restoration device includes: a self-propelled crawler vehicle, a plate frame 1 is mounted on the vehicle body, a lifting beam 11 is vertically fixed to one side of the plate frame 1, and a transfer frame 12 is slidably mounted on the lifting beam 11; A drill rod body 13 is vertically provided on one end face of the transfer frame 12. A conveying cylinder 2 is mounted on the transfer frame 12. The drill rod body 13 and the conveying cylinder 2 are coaxially arranged. A plurality of injection units 4 are evenly distributed along the axial direction of the drill rod body 13. A central shaft 14 is coaxially connected to the drill rod body 13. One side of the lower end of the lifting beam 11 is symmetrically connected to two adjustment plates 15, and a plurality of soil vibrating mechanisms 3 are distributed on the adjustment plate 15. Before soil remediation, a repair hole is drilled in the repair area in advance. The diameter of the repair hole is not less than the diameter of the drill rod body 13, and the transfer rack 12 can slide vertically along the lifting beam 11 to gradually drill the drill rod body 13 into the repair hole. When it reaches the specified depth, the various injection units 4 on the drill rod body 13 inject supercritical CO2 from different depths, thereby realizing soil remediation at different depths.

[0018] In this embodiment, a bevel gear is fixed to the end of each adjustment plate 15, and the lower end surface of the lifting beam 11 is connected to a transmission rod 16 for transverse rotation. The end of the transmission rod 16 is fixed with a bevel gear, and the bevel gear and the bevel gear are meshed and driven accordingly; The lower end surface of the lifting beam 11 is provided with a driving part (not shown in the figure), which is connected to the transmission rod 16 through a transmission belt. Among them, the transmission rod 16 can use the meshing action of the bevel gear and the bevel gear to drive the two adjustment plates 15 to deflect synchronously in the opposite direction during rotation, thereby effectively adjusting the soil vibrating mechanism 3 on the adjustment plate 15 to vibrate and loosen the soil at various points of the repair position.

[0019] As a preferred embodiment, the soil vibrating mechanism 3 includes a mounting frame 31, on one end of which a driving plate is slidably provided, a vertical hydraulic lifting rod 32 is fixed to the driving plate, a loading seat 33 is fixed to the lower end of the hydraulic lifting rod 32, and a chassis 34 is horizontally provided on the lower end of the loading seat 33, and the chassis 34 can contact the soil surface; A connecting plate 35 is slidably provided in the loading seat 33, and the connecting plate 35 is fixed to the chassis 34 via a plurality of vertically arranged side rods 36. The connecting plate 35 is symmetrically connected to the limiting springs 37, and a fixing plate is connected between the limiting springs 37; A linear vibrator 38 is provided in the loading seat 33, and the output end of the linear vibrator 38 is connected to the fixed plate. It should be noted that the linear vibrator 38 has a high vibration frequency and amplitude effect. During operation, it can drive the connecting plate 35 to vibrate downward through the limit spring 37, so that the chassis 34 under the connecting plate 35 can fully loosen the hard soil on the surface, significantly enhancing the permeability of supercritical CO2 and chelating agent in the soil pores without causing soil hardening or compaction.

[0020] In this embodiment, a negative pressure chamber 39 is provided in the chassis 34, and a plurality of suction holes are provided below the negative pressure chamber. During soil remediation, a portion of the soluble complex (such as EDTA-Pb) formed by the chelating agent and heavy metals may be desorbed from the soil micropores and retained in the shallow surface layer. Therefore, the soluble complex rich in heavy metals is actively pumped into the negative pressure chamber 39 by using the multiple suction holes through the negative pressure chamber 39, thereby avoiding back-infiltration or lateral diffusion of pollutants and improving the recovery rate.

[0021] In this embodiment, a positioning frame 21 is fixed on the transfer frame 12, and the conveying cylinder 2 is fixed in the positioning frame 21. The lower end surface of the conveying cylinder 2 is vertically connected to a connecting pipe 22, and the side wall of the connecting pipe 22 is connected to a side pipe 23. An injection pipe group 24 is provided in the positioning frame 21, and the injection pipe group 24 is connected to the side pipe 23; A guide channel 25 is provided in the central shaft 14 , and the connecting pipe 22 is sealedly connected to the guide channel 25 . Each of the injection units 4 is connected to the connecting pipe 22 via the guide channel 25 . A bidirectional motor 26 is installed above the conveying cylinder 2 , and an output end of the bidirectional motor 26 is connected to the central shaft 14 . The bidirectional motor 26 can drive the central shaft 14 to rotate in a forward or reverse direction.

[0022] In this embodiment, supercritical CO2 is transported in the injection pipe group 4; a feed pipe 27 is connected to one side of the delivery cylinder 2, and a chelating agent is transported in the feed pipe 27. The permeability of supercritical CO2 is utilized to enable it to carry the chelating agent into the soil, thereby efficiently and targetedly extracting heavy metals / organic pollutants; the supercritical CO2 and the chelating agent can be fully mixed in the connecting pipe 22 and enter the guide channel 25 in the central shaft 14 through the connecting pipe 22. The supercritical CO2 can flow into each injection unit 4 along the guide channel 25, so that the injection unit 4 inputs it into the soil layer at different depths to achieve efficient soil remediation.

[0023] As a preferred embodiment, the injection unit 4 includes a rotating shaft seat 41, which is constructed as a spherical structure and is embedded and rotatably arranged in the drill rod body 13. The arm of the central shaft 14 is provided with a spherical protrusion. The rotating shaft seat 41 and the spherical protrusion are arranged concentrically to facilitate the rolling assembly of the spherical protrusion. It should be noted that the drill rod body 13 is distributed with a limiting groove, and the rotating shaft seat 41 can only rotate flexibly in the limiting groove; A plurality of pressure rings 42 are distributed on the side wall of the rotating shaft seat 41 along the radial circumference of the drill rod body 13. The pressure rings 42 are all slidably connected to the rotating shaft seat 41. A return spring is connected between the pressure rings 42 and the rotating shaft seat 41. A nozzle 43 is fixed in the pressure ring sleeve 42, and an annular groove 44 is provided in the rotating shaft seat 41, and the annular groove 44 is connected to one end of each nozzle 43; the spherical protrusion of the central shaft 14 is provided with multiple discharge ports 45, and the discharge ports 45 can be connected to the guide channel 25, so that the supercritical CO2 in the central shaft tube 14 can enter the nozzle 43 in each pressure ring sleeve 42 through the discharge ports 45.

[0024] In this embodiment, a ball 46 is connected to the nozzle 43 via a pressure spring. The pressure spring pushes the ball 46 into the nozzle 43 under the action of elastic force. With this arrangement, after the supercritical CO2 enters the nozzle 43, the ball 46 can form a blockage on the end of the nozzle 43, so that the pressure ring 42 outside the nozzle 43 gradually slides out of the rotating shaft seat 41 under the hydraulic pressure, so that the nozzle 43 fully contacts the soil layer. As the internal pressure of the nozzle 43 increases, the ball 46 detaches from the end of the nozzle 43, and the supercritical CO2 can be ejected from each nozzle 43 into the soil layer. Each of the injection units 4 uses pressure springs of different or same specifications. The purpose of this setting is that the pressure springs with different elastic strengths can make the injection range and injection flow rate of the nozzle 43 in each injection unit 4 different. Therefore, for heavy metal contaminated areas, the distribution of heavy metal pollution in the soil layer can be obtained first, and appropriate remediation methods can be adopted, such as conical or inverted conical diffusion, cylindrical diffusion, etc., to improve the remediation efficiency.

[0025] In this embodiment, a ratchet 47 is fixed to the central shaft 14, and a plurality of pawls are distributed within the drill rod body 13. The ratchet 47 and the pawls engage with each other, so that the central shaft 14 rotates synchronously with the drill rod body 13 during reverse rotation. This allows the central shaft 14 to change the spraying direction of the nozzles 43 in the injection units 4 on the drill rod body 13 during reverse rotation, thereby achieving comprehensive coverage and repair of the soil layer and improving diffusion. An eccentric block 48 is sleeved on the central shaft 14 above the rotating shaft seat 41. Therefore, when the central shaft 14 is rotating in the forward direction and the drill rod body 13 is in a stationary state, the eccentric block 48 on the central shaft 14 can provide centrifugal vibration, thereby making the main body of the drill rod body 13 achieve a high-frequency vibration effect, further realizing the internal vibration loosening of the soil.

[0026] In this embodiment, the swash plate 5 is fixed to the central shaft 14, the top plate is fixed to the upper end of the rotating shaft seat 41, and the lower end inclined surface of the swash plate 5 is in contact with the top plate; An expansion groove 51 is provided on the spherical protrusion of the central shaft 14 at the discharge port 45. The cross section of the expansion groove 51 is an arc-shaped structure. The annular groove 44 is always sealed and connected with each expansion groove 51. Among them, the swash plate 5 can maintain the shaft seat 41 tilted to one side by about 12°, so that the corresponding nozzle 43 on the shaft seat 41 sprays downward at an angle, while the nozzle 43 on the other side sprays upward at an angle. The swash plate 5 can drive the shaft seat 41 to rotate around the spherical protrusion during continuous rotation with the central shaft 14, so that each nozzle 43 can perform continuous dynamic spraying, and the jet range is wide, ensuring full coverage within the soil layer.

[0027] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A heavy metal contaminated soil ecological restoration device, characterized in that: It includes: A self-propelled crawler vehicle, wherein a plate frame (1) is mounted on the vehicle body, a lifting beam (11) is vertically fixed to one side of the plate frame (1), and a transfer frame (12) is slidably mounted on the lifting beam (11); A drill rod body (13) is vertically provided on one end face of the transfer rack (12), a conveying cylinder (2) is mounted on the transfer rack (12), the drill rod body (13) and the conveying cylinder (2) are coaxially arranged, and a plurality of injection units (4) are equidistantly distributed on the surface of the drill rod body (13) along its axial direction, and a central shaft (14) is coaxially connected to the inside of the drill rod body (13); One side of the lower end of the lifting beam (11) is symmetrically rotatably connected to two adjustment plates (15), and a plurality of soil vibrating mechanisms (3) are distributed on the adjustment plates (15).

2. The heavy metal contaminated soil ecological restoration device according to claim 1, characterized in that: A bevel gear is fixed to the end of each adjustment plate (15), and the lower end surface of the lifting beam (11) is connected to a transmission rod (16) for transverse rotation. A bevel gear is fixed to the end of each transmission rod (16), and the bevel gear and the bevel gear are meshed and driven accordingly; The lower end surface of the lifting beam (11) is provided with a driving part, and the driving part is connected to the driving rod (16) through a transmission belt for transmission.

3. The heavy metal contaminated soil ecological restoration device according to claim 1, characterized in that: The soil vibrating mechanism (3) comprises a mounting frame (31), one end surface of which is slidably provided with a driving plate, a vertically arranged hydraulic lifting rod (32) is fixed to the driving plate, a loading seat (33) is fixed to the lower end surface of the hydraulic lifting rod (32), and a chassis (34) is horizontally provided on the lower end surface of the loading seat (33); A connecting plate (35) is slidably provided in the loading seat (33), and the connecting plate (35) is fixed to the chassis (34) via a plurality of vertically arranged side rods (36). Limiting springs (37) are symmetrically connected to the connecting plate (35), and a fixing plate is connected between the limiting springs (37); A linear vibrator (38) is provided in the loading seat (33), and an output end of the linear vibrator (38) is connected to the fixing plate.

4. The heavy metal contaminated soil ecological restoration device according to claim 3, characterized in that: A negative pressure chamber (39) is provided in the chassis (34), and a plurality of suction holes are provided below the negative pressure chamber.

5. The heavy metal contaminated soil ecological restoration device according to claim 1, characterized in that: A positioning frame (21) is fixed on the transfer rack (12), the conveying cylinder (2) is fixed in the positioning frame (21), the lower end surface of the conveying cylinder (2) is vertically connected to a connecting pipe (22), the side wall of the connecting pipe (22) is connected to a side pipe (23), and an injection pipe group (24) is provided in the positioning frame (21), and the injection pipe group (24) is connected to the side pipe (23); A flow guide channel (25) is provided in the central shaft (14), the connecting pipe (22) is sealedly connected to the flow guide channel (25), and each of the injection units (4) is connected to the connecting pipe (22) via the flow guide channel (25); A bidirectional motor (26) is installed above the conveying cylinder (2), and the output end of the bidirectional motor (26) is connected to the central shaft (14).

6. The heavy metal contaminated soil ecological restoration device according to claim 5, characterized in that: Supercritical CO2 is transported in the injection pipe group (4); a feed pipe (27) is connected to one side of the delivery cylinder (2), and a chelating agent is transported in the feed pipe (27).

7. The heavy metal contaminated soil ecological restoration device according to claim 1, characterized in that: The injection unit (4) includes a rotating shaft seat (41) which is constructed as a spherical structure and is embedded and rotatably arranged in the drill rod body (13); a spherical protrusion is provided on the arm of the central shaft (14); and the rotating shaft seat (41) and the spherical protrusion are arranged concentrically with each other; A plurality of pressure rings (42) are distributed on the side wall of the rotating shaft seat (41) along the radial circumference of the drill rod body (13), and the pressure rings (42) are all slidably connected to the rotating shaft seat (41). A return spring is connected between the pressure rings (42) and the rotating shaft seat (41); A nozzle (43) is fixed in the pressure ring sleeve (42), an annular groove (44) is provided in the rotating shaft seat (41), and the annular groove (44) is connected to one end of each nozzle (43); the spherical protrusion of the central shaft (14) is provided with a plurality of discharge openings (45).

8. The heavy metal contaminated soil ecological restoration device according to claim 7, characterized in that: A ball (46) is connected to the nozzle (43) via a pressure spring, and the pressure spring pushes the ball (46) into the nozzle (43) under the action of elastic force; Each of the injection units (4) uses pressure springs of different or same specifications.

9. The heavy metal contaminated soil ecological restoration device according to claim 7, characterized in that: A ratchet (47) is fixed to the central shaft (14), and a plurality of ratchets are distributed in the drill rod body (13). The drill rod body (13) is engaged with the ratchet (47) and the ratchets so that the central shaft (14) rotates synchronously with the drill rod body (13) in reverse rotation. An eccentric block (48) is sleeved on the central shaft (14) above the rotating shaft seat (41).

10. The heavy metal contaminated soil ecological restoration device according to claim 7, characterized in that: A swash plate (5) is fixed on the central shaft (14), a top plate is fixed on the upper end of the rotating shaft seat (41), and the lower end inclined surface of the swash plate (5) is in contact with the top plate; A flow expansion groove (51) is provided on the spherical protrusion of the central shaft (14) at the discharge port (45). The cross section of the flow expansion groove (51) is an arc-shaped structure. The annular groove (44) is always sealed and connected to each of the flow expansion grooves (51).

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