Heavy metal contaminated soil ecological remediation device

Abstract

The application discloses a heavy metal contaminated soil ecological restoration device, which comprises a self-propelled caterpillar vehicle, a plate frame is installed on the vehicle body of the self-propelled caterpillar vehicle, a lifting beam is vertically fixed on one side of the plate frame, a moving carrier is slidably installed on the lifting beam, a drill rod body is vertically arranged on one side end face of the moving carrier, a conveying cylinder is installed on the moving carrier, a plurality of injection and feeding units are equidistantly distributed on the surface of the drill rod body along the axial direction of the drill rod body, and a central shaft rod is coaxially connected in the drill rod body, two adjusting plates are symmetrically and rotatably connected on 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 in proportion, are conveyed to each injection and feeding unit through a flow guide channel, and are efficiently injected into soil micropores by the injection and feeding unit, gas level permeability of the supercritical CO2 is utilized, efficient extraction of heavy metal contaminated soil is realized, and efficient dissociation of heavy metal pollution at different depths is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soil ecological restoration, and specifically relates to a heavy metal contaminated soil ecological restoration device. BACKGROUND

[0002] At present, conventional soil ecological restoration devices mainly restore contaminated soil through physical, chemical, biological or combined methods, for example, soil is restored by mechanical stirring, and the restored soil is covered in the restoration area, which has high restoration efficiency, but destroys the soil aggregate structure and causes the loss of organic matter, and long-term ecological reconstruction is required after restoration; and part of the soil leaching system uses a leaching liquid preparation tank to inject the reagent into the soil through an injection well, but is limited by soil porosity and clay content, and can only effectively act on the 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 in the background art. SUMMARY

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: a heavy metal contaminated soil ecological restoration device, comprising: a self-propelled tracked vehicle, a plate frame is installed on the vehicle body, a lifting beam is vertically fixed on one side of the plate frame, a moving carrier is slidably installed on the lifting beam;

[0005] A drill rod body is vertically arranged on one side of the end surface of the moving carrier, a conveying cylinder is installed on the moving carrier, the drill rod body and the conveying cylinder are coaxially arranged, a plurality of injection and delivery units are equidistantly distributed on the surface of the drill rod body along the axial direction, and a central shaft is coaxially connected in the drill rod body;

[0006] Two adjusting plates are symmetrically and rotatably connected to one side of the lower end of the lifting beam, and a plurality of soil vibrating mechanisms are arranged on the adjusting plates.

[0007] Further, as a preferred, a bevel gear is fixed to the end of each adjusting plate, a transmission rod is transversely rotatably connected to the lower end surface of the lifting beam, a bevel gear is fixed to the end of each transmission rod, and the bevel gears are correspondingly meshed and transmitted with the bevel gears.

[0008] A driving part is arranged on the lower end surface of the lifting beam, and the driving part is connected and transmitted with the transmission rod through a transmission belt.

[0009] Further, as a preferred, the soil vibrating mechanism comprises a mounting frame, a driving plate is slidably arranged on one side of the end surface of the mounting frame, 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 arranged on the lower end surface of the loading seat.

[0010] A connecting plate is slidably arranged inside the loading seat. The connecting plate is fixed to the chassis by multiple vertically arranged side rods. Limiting springs are symmetrically connected to the connecting plate, and fixing plates are connected between the limiting springs.

[0011] A linear vibrator is installed inside the loading seat, and the output end of the linear vibrator is connected to the fixed plate.

[0012] Furthermore, as a preferred embodiment, the chassis is provided with a negative pressure chamber, and multiple suction holes are provided below the negative pressure chamber.

[0013] Furthermore, as a preferred embodiment, a positioning frame is fixed on the transfer frame, the conveying cylinder is fixed in the positioning frame, a connecting pipe is vertically connected to the lower end face of the conveying cylinder, a side passage pipe is connected to the side wall of the connecting pipe, and an injection pipe assembly is provided in the positioning frame, the injection pipe assembly being connected to the side passage pipe.

[0014] A flow guide channel is provided inside the central shaft, and the connecting pipe is sealed and connected to the flow guide channel. Each injection unit is connected to the connecting pipe through the flow guide channel.

[0015] A bidirectional motor is installed above the conveying cylinder, and the output end of the bidirectional motor is connected to the central shaft.

[0016] Furthermore, as a preferred embodiment, supercritical CO2 is conveyed within the injection pipe assembly; a feed pipe is connected to one side of the conveying cylinder, and a chelating agent is conveyed within the feed pipe.

[0017] Furthermore, as a preferred embodiment, the injection unit includes a rotating shaft seat, which is constructed as a spherical structure and is rotatably embedded 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.

[0018] Multiple pressure rings are distributed along the radial circumference of the drill rod body on the side wall of the rotating shaft seat. Each pressure ring is slidably connected to the rotating shaft seat, and a return spring is connected between the pressure ring and the rotating shaft seat.

[0019] The pressure ring sleeve has a nozzle fixed inside, and the rotating shaft seat has an annular groove that is connected to one end of each nozzle. The spherical protrusion of the central shaft has multiple drainage ports.

[0020] Furthermore, as a preferred embodiment, a ball is connected inside the nozzle by a pressure spring, and the pressure spring causes the ball to be pushed into the nozzle under the action of elastic force.

[0021] Each of the injection units uses a pressure spring of different or the same specifications.

[0022] Furthermore, as a preferred embodiment, a ratchet is fixed on the central shaft, and multiple pawls are distributed within the drill rod body. The drill rod body rotates synchronously with the central shaft during reverse rotation through the engagement of the ratchet and the pawls.

[0023] An eccentric block is fitted on the central shaft above the rotating shaft seat.

[0024] Furthermore, as a preferred embodiment, a swashplate is fixed on the central shaft, a top plate is fixed to the upper end of the rotating shaft seat, and the lower inclined surface of the swashplate abuts against and contacts the top plate.

[0025] The spherical protrusion of the central shaft has a flow-expanding groove at the drain outlet. The cross-section of the flow-expanding groove is arc-shaped, and the annular groove is always sealed and connected to each of the flow-expanding grooves.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] In this invention, remediation holes are pre-drilled in the soil for areas of heavy metal contaminated soil remediation. The drill rod on the transfer frame can drill into the remediation holes, and the drill rod is equipped with a central shaft with a flow channel inside. The injection pipe assembly connected to the external pipe can mix supercritical CO2 and chelating agent in a certain proportion and then transport them to each injection unit through the flow channel. The injection unit injects supercritical CO2 carrying chelating agent into the soil micropores efficiently. Utilizing the gas-level permeability of supercritical CO2, it ensures seepage and diffusion in the soil layer, thereby achieving efficient extraction of heavy metal contaminated soil. The lifting beam is also equipped with a soil vibration mechanism, which can provide soil loosening through a linear vibrator, thereby achieving efficient dissociation of heavy metal contamination at a depth of 0 to 5m in the deep soil layer. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the earth-vibrating mechanism in this invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of the loading seat in this invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of the connecting pipe in this invention;

[0032] Figure 5 This is a schematic diagram of the injection unit in this invention.

[0033] In the diagram: 1. Plate frame; 11. Lifting beam; 12. Transfer frame; 13. Drill rod body; 14. Central shaft; 15. Adjusting plate; 16. Transmission rod; 2. Conveying cylinder; 21. Positioning frame; 22. Connecting pipe; 23. Side pipe; 24. Injection pipe assembly; 25. Guide channel; 26. Bidirectional motor; 27. Feeding pipe; 3. Vibrating mechanism; 31. Mounting frame; 32. Hydraulic lifting rod; 33. Loading seat; 34. Chassis; 35. Connecting plate; 36. Side rod; 37. Limiting spring; 38. Linear vibrator; 39. Negative pressure chamber; 4. Injection unit; 41. Rotary shaft seat; 42. Pressure ring; 43. Nozzle; 44. Annular groove; 45. Drain outlet; 46. Ball bearing; 47. Ratchet; 48. Eccentric block; 5. Swashplate; 51. Flow diverter. Detailed Implementation

[0034] Please see Figures 1-5 In this embodiment of the invention, an ecological remediation device for heavy metal contaminated soil includes: a self-propelled tracked vehicle with a plate frame 1 installed on its body, a lifting beam 11 vertically fixed on one side of the plate frame 1, and a transfer frame 12 slidably installed on the lifting beam 11.

[0035] A drill rod body 13 is vertically arranged on one end face of the transfer frame 12. A conveying cylinder 2 is installed on the transfer frame 12. The drill rod body 13 and the conveying cylinder 2 are coaxially arranged. Multiple injection units 4 are equidistantly distributed on the surface of the drill rod body 13 along its axial direction. A central shaft 14 is coaxially connected inside the drill rod body 13.

[0036] Two adjusting plates 15 are symmetrically rotatably connected to one side of the lower end of the lifting beam 11. Multiple soil vibration mechanisms 3 are distributed on the adjusting plates 15. Before soil remediation, remediation holes are pre-drilled in the remediation area. The diameter of the remediation holes is not less than the diameter of the drill rod body 13. The transfer frame 12 can slide vertically along the lifting beam 11 to gradually drill the drill rod body 13 into the remediation hole. When it reaches the specified depth, each injection unit 4 on the drill rod body 13 injects supercritical CO2 from different depths, thereby realizing soil remediation at different depths.

[0037] In this embodiment, each of the adjusting plates 15 is fixed with a bevel gear at its end, and the lower end face of the lifting beam 11 is rotatably connected to a transmission rod 16. Each of the transmission rods 16 is fixed with a bevel gear at its end, and the bevel gear meshes with the bevel gear for transmission.

[0038] The lower end face of the lifting beam 11 is provided with a driving part (not shown in the figure). The driving part is connected to the transmission rod 16 through a transmission belt. The transmission rod 16 can drive the two adjusting plates 15 to deflect synchronously in opposite directions by the meshing action of bevel gear and conical gear during rotation, thereby effectively adjusting the soil vibration mechanism 3 on the adjusting plate 15 to loosen the soil at each point of the repair position.

[0039] In a preferred embodiment, the soil vibration mechanism 3 includes a mounting frame 31, on one side of which a drive plate is slidably mounted. A vertically mounted hydraulic lifting rod 32 is fixed on the drive plate. A loading seat 33 is fixed on the lower end of the hydraulic lifting rod 32. A base 34 is horizontally mounted on the lower end of the loading seat 33. The base 34 can contact the soil surface.

[0040] A connecting plate 35 is slidably disposed inside the loading seat 33. The connecting plate 35 is fixed to the chassis 34 by a plurality of vertically arranged side rods 36. Limiting springs 37 are symmetrically connected on the connecting plate 35, and a fixing plate is connected between the limiting springs 37.

[0041] A linear vibrator 38 is installed inside the loading seat 33. 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 and press down 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 enhance the permeability of supercritical CO2 and chelating agent in the soil pores, and will not cause soil compaction or compaction.

[0042] In this embodiment, a negative pressure chamber 39 is provided inside the chassis 34, and multiple suction holes are provided below the negative pressure chamber. During soil remediation, some of the soluble complexes (such as EDTA-Pb) formed by the chelating agent and heavy metals may desorb from the soil micropores and remain in the shallow surface layer. Therefore, by using the negative pressure chamber 39 and multiple suction holes, the soluble complexes rich in heavy metals can be actively drawn into the negative pressure chamber 39, avoiding the backflow or lateral diffusion of pollutants and improving the recovery rate.

[0043] In this embodiment, a positioning frame 21 is fixed on the transfer frame 12, the conveying cylinder 2 is fixed inside the positioning frame 21, a connecting pipe 22 is vertically connected to the lower end face of the conveying cylinder 2, a side passage pipe 23 is connected to the side wall of the connecting pipe 22, and an injection pipe assembly 24 is provided inside the positioning frame 21, the injection pipe assembly 24 is connected to the side passage pipe 23;

[0044] A flow channel 25 is provided inside the central shaft 14, and the connecting pipe 22 is sealed and connected to the flow channel 25. Each injection unit 4 is connected to the connecting pipe 22 through the flow channel 25.

[0045] A bidirectional motor 26 is installed above the conveying cylinder 2. The 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 either the forward or reverse direction.

[0046] In this embodiment, supercritical CO2 is transported in the injection tube assembly 4; a feeding pipe 27 is connected to one side of the delivery cylinder 2, and a chelating agent is transported in the feeding pipe 27. The permeability of supercritical CO2 allows it to carry the chelating agent into the soil, thereby efficiently and effectively targeting and 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, thereby being injected into the soil layer at different depths by the injection unit 4 to achieve efficient soil remediation.

[0047] In a preferred embodiment, the injection unit 4 includes a rotating shaft seat 41, which is constructed as a spherical structure and is rotatably embedded 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 provided with limiting grooves, and the rotating shaft seat 41 can only rotate flexibly in the limiting grooves.

[0048] Multiple pressure rings 42 are distributed along the radial circumference of the drill rod body 13 on the side wall of the rotating shaft seat 41. Each pressure ring 42 is slidably connected to the rotating shaft seat 41, and a return spring is connected between the pressure ring 42 and the rotating shaft seat 41.

[0049] The pressure ring 42 is fixed with a nozzle 43, and the rotating shaft seat 41 is provided with an annular groove 44, which is connected to one end of each nozzle 43. The spherical protrusion of the central shaft 14 is provided with multiple discharge ports 45, which can be connected to the guide channel 25. Therefore, the supercritical CO2 in the central shaft tube 14 can enter the nozzle 43 in each pressure ring 42 from the discharge ports 45.

[0050] In this embodiment, a ball bearing 46 is connected inside the nozzle 43 by a pressure spring. Under the action of the spring, the ball bearing 46 is pushed into the nozzle 43. With this configuration, after supercritical CO2 enters the nozzle 43, the ball bearing 46 can block the end of the nozzle 43, so that the pressure ring 42 outside the nozzle 43 gradually slides out of the pivot seat 41 under hydraulic push, so that the nozzle 43 can fully contact the soil layer. As the internal pressure of the nozzle 43 increases, the ball bearing 46 disengages from the end of the nozzle 43, and supercritical CO2 can be jetted from each nozzle 43 into the soil layer.

[0051] Each of the injection units 4 uses pressure springs of different or the same specifications. The purpose of this arrangement is that pressure springs with different elastic strengths can make the spray range and spray flow rate of the nozzles 43 in each injection unit 4 different. Therefore, for areas with heavy metal pollution, the distribution of heavy metal pollution in the soil layer can be obtained first, and appropriate remediation methods can be adopted, such as cone or inverted cone diffusion, column diffusion, etc., to improve remediation efficiency.

[0052] In this embodiment, a ratchet 47 is fixed on the central shaft 14, and multiple pawls are distributed inside the drill rod body 13. The drill rod body 13 is connected to the ratchet 47 and the pawls, so that the central shaft 14 rotates synchronously with the drill rod body 13 in the reverse rotation. This allows the central shaft 14 to change the spray direction of the nozzles 43 in each injection unit 4 on the drill rod body 13 in the reverse rotation, thereby achieving comprehensive coverage and repair of the soil layer and improving diffusion.

[0053] An eccentric block 48 is fitted on the central shaft 14 above the rotating shaft seat 41. Therefore, when the central shaft 14 is rotating in the forward direction, the drill rod body 13 is in a stationary state. The eccentric block 48 on the central shaft 14 can provide centrifugal vibration, thereby enabling the main body of the drill rod body 13 to achieve a high-frequency vibration effect, and further realizing the internal loosening of the soil.

[0054] In this embodiment, a swashplate 5 is fixed on the central shaft 14, a top plate is fixed at the upper end of the rotating shaft seat 41, and the lower inclined surface of the swashplate 5 abuts against the top plate.

[0055] The spherical protrusion of the central shaft 14 is provided with a diffusing groove 51 at the outlet 45. The diffusing groove 51 has an arc-shaped cross-section. The annular groove 44 is always sealed and connected to each of the diffusing grooves 51. The swash plate 5 can maintain the rotating shaft seat 41 tilted to one side by about 12°, so that the corresponding nozzle 43 on the rotating shaft seat 41 sprays downward at an angle, while the nozzle 43 on the other side sprays upward at an angle. As the swash plate 5 rotates continuously with the central shaft 14, it can drive the rotating shaft seat 41 to rotate around the spherical protrusion, so that each nozzle 43 can perform continuous dynamic spraying with a wide jet range, ensuring full coverage within the soil layer.

[0056] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heavy metal contaminated soil ecological remediation device, characterized in that, It includes: Self-propelled crawler, the body is installed with the board frame (1), one side of the board frame (1) is vertically fixed with lifting beam (11), lifting beam (11) is installed with the removal carrier (12) on the sliding; One side end surface of the removal carrier (12) is vertically provided with the drill rod body (13), the removal carrier (12) is installed with the conveying cylinder (2), the drill rod body (13) and conveying cylinder (2) are coaxial, and the surface of the drill rod body (13) is equidistantly distributed with multiple injection and delivery units (4) along its axial direction, the drill rod body (13) is coaxially connected with the center shaft (14) in it; The lower end of the lifting beam (11) is symmetrically connected with two adjusting plates (15), and the adjusting plate (15) is distributed with multiple soil vibrating mechanisms (3); The injection and delivery unit (4) includes a rotating shaft seat (41) which is configured as a spherical structure and embedded in the rotating arrangement in the drill rod body (13), the shaft arm of the center shaft (14) is provided with a spherical protrusion, and the rotating shaft seat (41) is provided with the same spherical center as the spherical protrusion; The side wall of the rotating shaft seat (41) is distributed with multiple pressure ring sleeves (42) along the radial circumference of the drill rod body (13), the pressure ring sleeve (42) is slidably connected with the rotating shaft seat (41), and the pressure ring sleeve (42) and the rotating shaft seat (41) are connected with a return spring; The pressure ring sleeve (42) is fixed with a spray head (43), the rotating shaft seat (41) is provided with an annular groove (44), and one end of the spray head (43) is in communication with the annular groove (44); The spherical protrusion of the center shaft (14) is provided with multiple discharge ports (45); The center shaft (14) is fixed with a swash plate (5), the upper end of the rotating shaft seat (41) is fixed with a top plate, and the lower end of the swash plate (5) is in contact with the top plate; The spherical protrusion of the center shaft (14) is provided with a flow expansion groove (51) at the discharge port (45), the cross section of the flow expansion groove (51) is arc-shaped structure, and the annular groove (44) is always in sealed communication with each flow expansion groove (51); The removal carrier (12) is fixed with a positioning frame (21), the conveying cylinder (2) is fixed in the positioning frame (21), the lower end of the conveying cylinder (2) is vertically connected with a connecting pipe (22), the side wall of the connecting pipe (22) is connected with a side pipe (23), the positioning frame (21) is provided with an injection and delivery pipe group (24), and the injection and delivery pipe group (24) is in communication with the side pipe (23); The center shaft (14) is provided with a flow guide channel (25), the connecting pipe (22) is in sealed communication with the flow guide channel (25), and each injection and delivery unit (4) is in communication with the connecting pipe (22) through the flow guide channel (25); The upper side of the conveying cylinder (2) is provided with a bidirectional motor (26), and the output end of the bidirectional motor (26) is connected with the center shaft (14).

2. The heavy metal contaminated soil ecological remediation device according to claim 1, characterized in that: The end of each of the adjusting plates (15) is fixed with a bevel gear, the lower end surface of the lifting beam (11) is transversely rotationally connected with a transmission rod (16), the end of the transmission rod (16) is fixed with a bevel gear, and the bevel gears are correspondingly meshed and driven; The lower end surface of the lifting beam (11) is provided with a driving part, and the driving part is connected and driven with the transmission rod (16) through a transmission belt.

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

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

5. The heavy metal contaminated soil ecological remediation device according to claim 1, characterized in that: Supercritical CO2 is conveyed in the injection pipe group (24), and a feeding pipe (27) is connected on one side of the conveying cylinder (2), and a chelating agent is conveyed in the feeding pipe (27).

6. The heavy metal contaminated soil ecological remediation device according to claim 1, characterized in that: A ball (46) is connected in the spray head (43) through a pressure spring, and the ball (46) is pushed into the interior of the spray head (43) under the elastic force of the pressure spring. The injection units (4) are different or same in specification.

7. The heavy metal contaminated soil ecological remediation device according to claim 1, characterized in that: A ratchet wheel (47) is fixed on the central shaft rod (14), a plurality of pawls are distributed in the drill rod body (13), the central shaft rod (14) is synchronously rotated with the drill rod body (13) in reverse rotation through the clamping action of the ratchet wheel (47) and the pawls. An eccentric block (48) is sleeved above the shaft seat (41) on the central shaft rod (14).

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