A soil remediation apparatus

Abstract

The present application relates to a kind of soil remediation equipment, comprising: frame;Plough is arranged in front of frame;Rotary shaft is arranged in rear of frame and is located in the rear side of plough, rotary shaft is installed with plowshare;Spraying pipeline is arranged on rotary shaft, spraying pipeline is provided with at least one nozzle, nozzle is close to plowshare to be set to spray pesticide to soil interior when plowshare operation.Such, by setting plough in front of frame to pre-break soil structure, reduce subsequent plowshare resistance, plowshare installed on rotary shaft in rear of frame is rotated at low speed to reduce soil aggregate structure damage, while spraying pipeline is arranged on rotary shaft close to plowshare to spray pesticide to soil interior, form " plough pre-break resistance-low speed plowshare soil turning-close to plowshare spray medicine " synergic structure, effectively realize the sufficient turning of about 50cm deep soil, promote the uniform mixing of pesticide and deep and shallow soil, inhibit the secondary pollution caused by dust from source.

Description

Technical Field

[0001] This invention relates to the field of soil remediation machinery technology, and in particular to a soil remediation device for soil remediation. Background Technology

[0002] Remediation of heavy metal contaminated soil is an important area of ​​ecological and environmental protection. Currently, the mainstream remediation methods include chemical remediation and thermal desorption remediation. While thermal desorption remediation can remove over 99% of pollutants, it suffers from high costs, soil sintering, and the extinction of soil microorganisms, resulting in an extremely long recovery period for the soil to reach a cultivable or other ecological state, making it difficult to meet the need for rapid soil ecological restoration. Therefore, chemical remediation methods (such as solidifying agents) have become the primary choice for heavy metal contaminated soil remediation due to their lower cost and ease of operation.

[0003] In chemical remediation, it is necessary to thoroughly mix the agent with the contaminated soil through tillage in order to solidify or stabilize the heavy metals. In the existing technology, rotary tillers are the main tillage equipment, but they have significant defects in soil remediation scenarios: (1) Insufficient stirring of deep soil: The heavy metal contamination layer is usually about 50cm deep. Although the existing rotary tillage equipment can reach this depth, it does not stir the deep soil sufficiently, which makes it difficult for the agent to penetrate to the deep layer and the remediation effect is uneven; (2) Insufficient mixing of agents: The remediation agent is mostly sprayed on the surface and relies on the tillage blade to stir it to achieve mixing with the soil. However, insufficient stirring of deep soil further aggravates the mixing defects between the agent and the deep soil, resulting in the deep soil (3) Severe dust pollution: During the tillage operation, the dry soil is violently disturbed, generating a large amount of dust containing heavy metals, causing secondary pollution to spread; (4) Damage to soil structure: The high-speed rotating blade will excessively break the soil aggregate structure, resulting in soil compaction, poor permeability, and reduced water and fertilizer retention capacity, which is not conducive to subsequent ecological restoration; (5) Speed ​​contradiction: If the blade rotation speed is too slow, the mixing effect will be poor, and it will be impossible to ensure that the agent and soil are fully mixed; if the speed is too fast, it will aggravate the damage to the soil aggregate structure and dust problem, making it difficult to balance. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a soil remediation tillage device that can simultaneously achieve deep soil turning, thorough mixing of agents, reduced dust, and protection of soil structure, thereby improving the remediation efficiency and ecological restoration effect of heavy metal contaminated soil.

[0005] This application provides a soil remediation device, comprising:

[0006] frame;

[0007] A plow located in front of the frame is used to pre-damage the soil structure to reduce the operating resistance of subsequent tillage blades;

[0008] A rotating shaft is located behind the frame and on the rear side of the plow. A tillage blade is mounted on the rotating shaft. The tillage blade is configured to rotate at a preset low speed to reduce damage to the soil aggregate structure.

[0009] A spraying pipe is provided on the rotating shaft, the spraying pipe is provided with at least one nozzle, the nozzle is positioned close to the tiller to spray pesticide into the soil during tilling operation, and the spraying pipe is connected to an external pesticide supply device.

[0010] In one embodiment, the spraying pipeline is a hollow tube extending axially along the rotation axis, and the tube wall of the spraying pipeline is formed into nozzles by laser cutting.

[0011] In one embodiment, the minimum diameter of the nozzle is not less than 5 mm, and the angle between the length direction of the nozzle and the axis of rotation is 30 to 60 degrees.

[0012] And / or, the length of the nozzle is 1 / 5 to 1 / 3 of the circumference of the spray pipe, and the nozzle edge is rounded with a radius of not less than 1 mm to reduce turbulence loss during agent spraying.

[0013] In one embodiment, at least three spray pipes are fixed on each rotating shaft. The at least three spray pipes are all fixed on the rotating shaft and are distributed circumferentially along the rotating shaft. The spraying directions of adjacent groups of nozzles form a 5-15cm overlapping coverage area in the soil depth direction.

[0014] In one embodiment, one end of the spraying pipeline near the top of the rotating shaft is connected to an external agent supply device via a rotary sealing joint, wherein the rotational resistance torque of the rotary sealing joint is less than 0.5 N·m.

[0015] In one embodiment, the rotary sealing joint includes:

[0016] A shaft-mounted adapter is fixed to the frame. The shaft-mounted adapter has a rotating adapter hole. A rotating shaft is nested and fitted into the rotating adapter hole. The rotating shaft is rotatable relative to the shaft-mounted adapter.

[0017] A liquid supply upper cover is arranged around the circumferential outer side of the shaft-mounted adapter. The liquid supply upper cover is connected to the shaft-mounted adapter and is configured to connect with the delivery pipeline of an external liquid supply device.

[0018] The hollow connector body has an internal flow channel for the flow of repair agents. The connector body is connected to the upper cover flange of the liquid supply. The connector body has an annular groove on its inner wall.

[0019] The lower end cap of the pipeline connection is arranged around the outer circumference of the rotating shaft. The lower end cap of the pipeline connection is fixedly connected to the rotating shaft. The outer flange of the lower end cap of the pipeline connection is rotatably installed in the annular groove. The lower end cap of the pipeline connection is provided with a through-hole for passing pesticide. The spraying pipeline is screwed into the through-hole for passing pesticide and connected to the flow channel.

[0020] In one embodiment, the rotary sealing joint further includes a pulse transition plate, the outer flange of which is fixed to the inner wall of the joint body. The pulse transition plate has a through hole in the middle for the rotating shaft to pass through. The pulse transition plate has a plurality of large-diameter holes and a plurality of small-diameter holes, which are alternately distributed along the circumferential direction of the rotating shaft.

[0021] When the lower end cap of the pipeline rotates relative to the pulse transition plate, the large and small diameter holes alternately align with the drug passage holes. By changing the diameter and blocking, the opening and closing of the drug passage holes are controlled, so that the agent flows through the spraying pipeline in a flow fluctuation manner, forming a pulse spray.

[0022] When the orifice is not aligned with the drug passage, the orifice is blocked, and the drug is in an energy storage state in the flow channel.

[0023] When the small-diameter orifice is aligned with the orifice, the agent enters the spraying pipeline to replenish the agent but is not sprayed, filling the pipeline space to reduce the pressure drop of subsequent spraying.

[0024] When the large-diameter orifice is aligned with the medicine hole, the spray pipeline releases pressure to achieve high-pressure spraying, reducing nozzle clogging.

[0025] In one embodiment, a sealing ring is rotatably provided between the lower end cap of the pipeline connection and the annular groove; the sealing ring is made of fluororubber material resistant to chemical corrosion.

[0026] In one embodiment, the soil remediation equipment further includes a post-plow spraying pipe located behind the plow. The post-plow spraying pipe is fixed to the frame and located behind the plow. The post-plow spraying pipe is equipped with nozzles facing the tillers. The spraying range of the nozzles is up to 180°. The nozzles are used to pre-spray the agent onto the tiller's working area to help moisten the soil, and the agent is initially mixed with the soil through the mixing action of the tillers.

[0027] In one embodiment, the number of nozzles in the post-plow spraying pipeline is 1-2, the horizontal distance between the nozzles and the plow is 10-20cm, and the angle between the spraying direction of the nozzles and the horizontal plane is 15-30°;

[0028] And / or, the soil remediation equipment further includes a drive unit mounted on the frame, the drive unit driving the rotating shaft to rotate via a belt.

[0029] In one embodiment, the soil remediation device is provided with a plurality of plows and a plurality of rotating shafts, with each plow and each rotating shaft corresponding to one another, the spacing between adjacent plows being 30-50cm, and each rotating shaft being provided with a plurality of tillage blades.

[0030] And / or, the preset low speed of the tiller blade is 80-120 rpm;

[0031] And / or, the tillage blade has an arc-shaped structure, the blade angle of the tillage blade is 20-30 degrees, and the distance between adjacent tillage blades in the rotation axis is 15-25cm;

[0032] And / or, the minimum straight-line distance between the nozzle and the tillage blade is 5-15cm, and the spray direction of the nozzle is towards the working trajectory area of ​​the tillage blade, so as to achieve instant mixing of the agent and soil simultaneously when the tillage blade stirs the soil, and suppress dust by moistening the soil with the agent;

[0033] And / or, the soil remediation equipment also includes a soil moisture sensor and a controller. The soil moisture sensor is located on the side of the frame near the tillage blades and is used to detect the real-time moisture of the soil in the working area. The controller is electrically connected to the soil moisture sensor and the delivery pump of the external agent supply device, and is configured to adjust the spraying flow rate of the agent according to the soil moisture. When the soil moisture is lower than a preset threshold, the spraying flow rate is increased to ensure that the soil moisture meets the dust suppression requirements.

[0034] And / or, the frame is provided with a height adjustment mechanism, which is connected to the plow and the rotating shaft respectively, and is configured to adjust the soil penetration depth of the plow and the rotating shaft by hydraulic drive;

[0035] And / or, the tiller blade is connected to the rotating shaft via a detachable structure, the detachable structure including bolts and locating pins, the end of the tiller blade being provided with a mounting hole adapted to the rotating shaft, the locating pin being used to restrict the circumferential rotation of the tiller blade, and the bolt being used for axial fixation;

[0036] And / or, the working depth of the plow is 45-55cm, and the plow's soil-entry end is provided with a wedge-shaped cutting edge, the angle of the wedge-shaped cutting edge being 25-40 degrees.

[0037] The aforementioned soil remediation equipment addresses the problems of insufficient deep soil agitation, inadequate mixing of chemicals and soil, severe dust generation, and excessive damage to soil aggregate structure in existing rotary tillers when treating heavy metal contaminated soil. This application's soil remediation equipment addresses these issues by placing a plow at the front of the frame to pre-disrupt the soil structure and reduce the resistance of subsequent tillage blades. The tillage blades mounted on the rotating shaft at the rear of the frame rotate at low speed to minimize damage to the soil aggregate structure. Simultaneously, a spray pipe located near the tillage blades on the rotating shaft sprays chemicals into the soil. This forms a synergistic structure of "plow pre-disruption – low-speed tillage – near-blade spraying," effectively achieving thorough agitation of the soil at a depth of approximately 50cm. This promotes uniform mixing of chemicals with both shallow and deep soil layers, suppresses secondary pollution caused by dust at the source, protects the soil aggregate structure, and balances soil remediation effectiveness with subsequent ecological restoration needs. In this soil remediation equipment, the plow at the front remains stationary, pre-disrupting the soil structure solely through its design. This significantly reduces the operating resistance of the rear tillage blades, allowing them to rotate at a low speed of approximately 100 rpm. This eliminates concerns about the blades failing to reach the deeper soil layers (around 50 cm) due to the low rotation speed, effectively reducing excessive damage to soil aggregates. Simultaneously, the spray pipes on the rear rotating shaft penetrate deep into the soil to spray the pesticide. This ensures that the pesticide mixes with the soil, no longer solely relying on the tillage blades' agitation, thus fully compensating for the insufficient mixing capacity of the low-speed blades. Furthermore, the spray depth can be flexibly controlled by adjusting the nozzle position. Combined with increasing the range or number of nozzles, this ensures thorough mixing of both shallow and deep soil layers with the pesticide. The nozzles' proximity to the tillage blades allows for rapid soil wetting with the pesticide, further preventing dust generation and comprehensively improving the soil remediation effect. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a soil remediation device according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the soil remediation device according to another embodiment of the present invention;

[0040] Figure 3 This is a structural schematic diagram of a soil remediation device according to an embodiment of the present invention from another angle.

[0041] Figure 4 This is a structural schematic diagram of a soil remediation device according to an embodiment of the present invention from another angle.

[0042] Figure 5 for Figure 4 Cross-sectional view along line AA;

[0043] Figure 6 for Figure 5 Enlarged view at point B;

[0044] Figure 7 A partial structural cross-sectional view of a soil remediation device according to another embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the structure of the pulse transition plate of a soil remediation device according to another embodiment of the present invention. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] This application provides a soil remediation device; please refer to [link / reference]. Figures 1 to 6 The soil remediation equipment 10 includes:

[0048] 100 racks;

[0049] A plow 200 is located in front of the frame 100. The plow is used to pre-break the soil structure to reduce the operating resistance of the subsequent tillage blades.

[0050] A rotating shaft 300 is located behind the frame 100 and on the rear side of the plow 200. A tillage blade 310 is mounted on the rotating shaft 300. The tillage blade 310 is configured to rotate at a preset low speed to reduce damage to the soil aggregate structure.

[0051] A spray pipe 400 is provided on the rotating shaft 300. The spray pipe is provided with at least one nozzle. The nozzle is located near the tillage blade 310 to spray pesticide into the soil during tillage. The spray pipe 400 is connected to an external pesticide supply device 700.

[0052] In this embodiment, the frame 100 serves as an overall support and installation unit. For example, the frame is equipped with a hook 110 for attaching to a tractor or other traction equipment.

[0053] In this embodiment, the soil structure is pre-damaged by the plow 200 in front of the frame 100, which reduces the operating resistance of the subsequent tillage blades 310. This allows the tillage blades to rotate at a preset low speed (such as about 100 revolutions per minute), effectively reducing damage to the soil aggregate structure, preventing soil compaction, improving soil permeability and water and fertilizer retention capacity, and facilitating subsequent ecological restoration (such as cultivation).

[0054] In this embodiment, the spray pipe 400 on the rotating shaft 300 and the nozzle near the tiller 310 can directly spray the agent into the soil without relying solely on the tiller 310 to agitate and mix. This compensates for the insufficient mixing capacity of the low-speed tiller 310, ensuring that the agent can fully contact both deep and shallow soil layers, and solving the problems of insufficient agent mixing and difficulty in repairing deep soil layers in existing equipment.

[0055] In this embodiment, the nozzle is positioned close to the tillage blade 310, allowing the pesticide to quickly moisten the soil during tillage blade 310 operation, suppressing dust at the source and preventing secondary pollution caused by the diffusion of dust containing heavy metals.

[0056] The aforementioned soil remediation equipment addresses the problems of insufficient deep soil agitation, inadequate mixing of chemicals and soil, severe dust generation, and excessive damage to soil aggregate structure in existing rotary tillers when treating heavy metal contaminated soil. This application's soil remediation equipment addresses these issues by placing a plow at the front of the frame to pre-disrupt the soil structure and reduce the resistance of subsequent tillage blades. The tillage blades mounted on the rotating shaft at the rear of the frame rotate at low speed to minimize damage to the soil aggregate structure. Simultaneously, a spray pipe located near the tillage blades on the rotating shaft sprays chemicals into the soil. This forms a synergistic structure of "plow pre-disruption – low-speed tillage – near-blade spraying," effectively achieving thorough agitation of the soil at a depth of approximately 50cm. This promotes uniform mixing of chemicals with both shallow and deep soil layers, suppresses secondary pollution caused by dust at the source, protects the soil aggregate structure, and balances soil remediation effectiveness with subsequent ecological restoration needs. In this soil remediation equipment, the plow at the front remains stationary, pre-disrupting the soil structure solely through its design. This significantly reduces the operating resistance of the rear tillage blades, allowing them to rotate at a low speed of approximately 100 rpm. This eliminates concerns about the blades failing to reach the deeper soil layers (around 50 cm) due to the low rotation speed, effectively reducing excessive damage to soil aggregates. Simultaneously, the spray pipes on the rear rotating shaft penetrate deep into the soil to spray the pesticide. This ensures that the pesticide mixes with the soil, no longer solely relying on the tillage blades' agitation, thus fully compensating for the insufficient mixing capacity of the low-speed blades. Furthermore, the spray depth can be flexibly controlled by adjusting the nozzle position. Combined with increasing the range or number of nozzles, this ensures thorough mixing of both shallow and deep soil layers with the pesticide. The nozzles' proximity to the tillage blades allows for rapid soil wetting with the pesticide, further preventing dust generation and comprehensively improving the soil remediation effect.

[0057] In one embodiment, the soil remediation equipment further includes a drive unit 500, which is mounted on the frame 100. The drive unit 500 drives the rotating shaft to rotate via a belt 510. The belt drive is suitable for low-speed rotation scenarios, providing smooth operation and shock absorption, ensuring the stability of the tillage blades during low-speed rotation, and reducing damage to the soil aggregate structure. For example, the soil remediation equipment 10 is equipped with multiple plows 200 and multiple rotating shafts 300, with each plow 200 and each rotating shaft 300 corresponding to one another. The distance between adjacent plows 200 is 30-50 cm, and each rotating shaft 300 is equipped with multiple tillage blades 310. In this way, multiple plows correspond one-to-one with multiple rotating shafts, and the distance between multiple plows is 30-50cm, which can improve the work efficiency and ensure the uniformity of soil remediation over a large area. For example, the preset low speed of the tillage blade is 80-120 rpm; or the preset low speed of the rotating shaft is 80-120 rpm. Thus, driven by the low speed of the rotating shaft, the preset low speed of the tillage blade (80-120 rpm) precisely matches the need to "reduce the destruction of aggregates" and balances mixing and maintaining the structure.

[0058] In one embodiment, the spraying pipe 400 is a hollow tube extending axially along the rotation axis 300, and the pipe wall of the spraying pipe 400 is laser-cut to form nozzles. Thus, the spraying pipe is a hollow tube extending axially along the rotation axis, and the nozzles are formed by laser cutting. Laser-cut nozzles have high precision and regular edges, ensuring the stability and consistency of pesticide spraying. Simultaneously, the axial extension of the hollow tube structure allows for a more uniform pesticide spraying range along the rotation axis, improving the mixing effect between the soil and the pesticide.

[0059] In one embodiment, the minimum diameter of the nozzle is not less than 5 mm, and the angle between the length direction of the nozzle and the axis of rotation is 30 to 60 degrees. Thus, the minimum nozzle diameter of not less than 5 mm can avoid clogging of the nozzle by particles that may exist in the agent, ensuring continuous spraying. The angle between the length direction of the nozzle and the axis of rotation is 30 to 60 degrees, which optimizes the direction of agent spraying, so that the agent can more accurately cover the tillage area and improve mixing efficiency.

[0060] In one embodiment, the length of the nozzle is 1 / 5 to 1 / 3 of the circumference of the spray pipe, and the nozzle edge is rounded with a radius of not less than 1 mm to reduce turbulence loss during pesticide spraying. This reduces turbulence loss during pesticide spraying, improves pesticide utilization, and avoids reduced nozzle lifespan due to turbulence wear.

[0061] In one embodiment, at least three spray pipes 400 are fixed to each rotating shaft 300. These at least three spray pipes 400 are all fixed to the rotating shaft 300 and are spaced apart circumferentially along the rotating shaft 300. The spray directions of adjacent groups of nozzles form a 5-15cm overlap zone in the soil depth direction. This significantly expands the spatial coverage of the pesticide spraying. The overlap zone design ensures that both deep and shallow soil layers can fully contact the pesticide, avoiding incomplete local soil remediation and improving the overall remediation effect.

[0062] In one embodiment, the end of the spraying pipeline near the top of the rotating shaft is connected to an external agent supply device 700 via a rotary sealing joint 600. The rotational resistance torque of the rotary sealing joint is less than 0.5 N·m. Thus, the rotational resistance torque of the rotary sealing joint is less than 0.5 N·m, which can adapt to the low-speed rotation requirements of the rotating shaft, reduce energy loss caused by excessive joint resistance, and ensure stable delivery of the agent during rotation, avoiding disruption of the agent mixing effect due to delivery interruption.

[0063] In one embodiment, please refer to Figures 4 to 6 The rotary sealing joint 600 includes:

[0064] A shaft-mounted adapter 610 is fixed to the frame 100. The shaft-mounted adapter 610 has a rotating adapter hole 611. The rotating shaft 300 is nested and fitted in the rotating adapter hole 611. The rotating shaft is rotatable relative to the shaft-mounted adapter.

[0065] The liquid supply upper cover 620 is arranged around the circumferential outer side of the shaft-mounted adapter 610. The liquid supply upper cover 620 is connected to the shaft-mounted adapter 610 and is configured to connect with the delivery pipeline 710 of the external liquid supply device.

[0066] The hollow connector body 630 has an internal flow channel for the flow of repair agents. The connector body 630 is connected to the flange of the liquid supply upper cover 620. The connector body 630 has an annular groove 631 on its inner wall.

[0067] The lower end cap 640 of the pipeline connection is arranged around the outer circumference of the rotating shaft 300. The lower end cap 640 of the pipeline connection is fixedly connected to the rotating shaft 300. The outer flange of the lower end cap 640 of the pipeline connection is rotatably installed in the annular groove 631. The lower end cap 640 of the pipeline connection is provided with a through-hole 641 for passing pesticide. The spraying pipeline 400 is screwed into the through-hole 641 and connected to the flow channel.

[0068] In this way, a reliable connection is achieved between the rotation of the rotating shaft 300 and the fixed delivery of the agent, ensuring that the rotating shaft 300 can rotate freely and that the agent can stably enter the spraying pipeline 400 through the flow channel, avoiding agent leakage and improving the stability of equipment operation.

[0069] In one embodiment, a sealing ring 6311 is rotatably positioned between the lower end cap 640 of the pipeline connection and the annular groove 631; the sealing ring 6311 is made of fluororubber material resistant to chemical corrosion. This enhances the sealing performance of the rotary sealing joint, preventing chemical leakage; moreover, the fluororubber material is resistant to chemical corrosion and can withstand the long-term erosion of various chemical agents in soil remediation, extending the service life of the equipment.

[0070] In one embodiment, the soil remediation equipment further includes a chemical supply device 700, the pipeline of which delivers chemicals via a pump to the flow channels of each rotary sealing joint 600. For example, the chemical supply device 700 is fixed to the frame 100.

[0071] In one embodiment, the soil remediation equipment further includes a post-plow spraying pipe located behind the plow. The post-plow spraying pipe is fixed to the frame and positioned behind the plow. The post-plow spraying pipe has nozzles facing the tillage blades, with a maximum spray range of 180°. These nozzles are used to pre-spray pesticides onto the tillage blades' working area to aid in soil wetting, and the pesticides are initially mixed with the soil through the mixing action of the tillage blades. Thus, the pre-spraying of pesticides by the post-plow spraying pipes into the tillage blades' working area can pre-wet the soil, further aiding in dust suppression. Simultaneously, the pre-sprayed pesticides are initially mixed through the mixing action of the tillage blades, creating a synergistic "dual spraying-mixing" effect with the spraying pipes on the rotating shaft, improving the uniformity of the pesticide-soil mixture.

[0072] In one embodiment, the number of nozzles in the post-plow spraying pipeline is 1-2, the horizontal distance between the nozzle and the plow is 10-20cm, and the angle between the spraying direction of the nozzle and the horizontal plane is 15 degrees to 30 degrees; in this way, the initial area of ​​the tiller entering the soil can be accurately covered, ensuring that the pre-sprayed agent acts efficiently on the tiller's working range, and improving the pre-wetting and initial mixing effect.

[0073] In one embodiment, the tillage blade has an arc-shaped structure, the blade angle is 20-30 degrees, and the distance between adjacent tillage blades along the rotation axis is 15-25 cm; thus, the soil agitation effect can be optimized, and sufficient turning can still be achieved at low speed rotation, while avoiding excessive crushing.

[0074] In one embodiment, the minimum straight-line distance between the nozzle and the tillage blade is 5-15 cm, and the nozzle sprays towards the working trajectory area of ​​the tillage blade to achieve instant mixing of the pesticide and soil simultaneously while the tillage blade agitates the soil, and to suppress dust by wetting the soil with the pesticide. This optimizes the soil agitation effect, achieving sufficient turning even at low rotation speeds while avoiding excessive breakage. The design of the nozzle-tillage blade distance and spray direction ensures instant mixing of the pesticide while the tillage blade agitates, enhancing dust suppression and mixing effects. For example, the nozzle's radiation range or installation angle is adjustable. For example, the nozzle position of the spray pipe can be adjusted radially along the rotation axis to adjust the pesticide spraying depth. For example, the plowshares are arranged in an array, with a spacing of 30-50 cm between adjacent plowshares.

[0075] In one embodiment, the soil remediation equipment further includes a soil moisture sensor and a controller. The soil moisture sensor is located on the side of the frame near the tillage blades and is used to detect the real-time moisture of the soil in the working area. The controller is electrically connected to both the soil moisture sensor and the delivery pump of the external agent supply device, and is configured to adjust the spraying flow rate of the agent according to the soil moisture. When the soil moisture is lower than a preset threshold, the spraying flow rate is increased to ensure that the soil moisture meets the dust suppression requirements. In this way, the soil moisture sensor and the controller work together to adjust the agent flow rate according to the real-time moisture, ensuring that the soil moisture meets the dust suppression requirements and avoiding agent waste or insufficiency.

[0076] In one embodiment, the frame is provided with a height adjustment mechanism, which is connected to the plow and the rotating shaft respectively, and is configured to adjust the soil penetration depth of the plow and the rotating shaft by hydraulic drive; thus, the height adjustment mechanism can adjust the soil penetration depth by hydraulic drive to adapt to different contamination layer thicknesses and improve the applicability of the equipment.

[0077] In one embodiment, the tiller blade is connected to the rotating shaft via a detachable structure, which includes bolts and locating pins. The end of the tiller blade is provided with a mounting hole adapted to the rotating shaft. The locating pin is used to restrict the circumferential rotation of the tiller blade, and the bolts are used for axial fixation. Thus, the detachable structure of the tiller blade facilitates maintenance and replacement.

[0078] In one embodiment, the plow operates at a depth of 45-55 cm, and the plow's entry end is equipped with a wedge-shaped cutting edge with an angle of 25-40 degrees. This allows for precise disruption of the soil structure in heavy metal contaminated layers, reduces tillage resistance, and ensures effective deep soil remediation.

[0079] To further improve the spraying effect of the pesticide, in one embodiment, please refer to... Figure 7 and Figure 8The rotary sealing joint 600 further includes a pulse transition plate 650, whose outer flange 651 is fixed to the inner wall of the joint body 630, and a through hole 652 for the rotating shaft 300 to pass through in the middle; the pulse transition plate 650 is provided with a plurality of large-diameter holes 653 and a plurality of small-diameter holes 654, which are alternately distributed along the circumference of the rotating shaft 300;

[0080] When the lower end cap 640 of the pipeline connection rotates relative to the pulse transition plate 650, the large and small diameter holes alternately align with the drug passage hole 311. By changing the diameter and controlling the opening and closing of the drug passage hole, the agent flows through the spraying pipeline 400 in a flow fluctuation manner, forming a pulse spray.

[0081] When the orifice is not aligned with the drug passage, the orifice is blocked, and the drug is in an energy storage state in the flow channel.

[0082] When the small-diameter orifice is aligned with the orifice, the agent enters the spraying pipeline to replenish the agent but is not sprayed, filling the pipeline space to reduce the pressure drop of subsequent spraying.

[0083] When the large-diameter orifice is aligned with the medicine hole, the spray pipeline releases pressure to achieve high-pressure spraying, reducing nozzle clogging.

[0084] Thus, by setting up a pulse transition plate, aligning the small and large diameter orifices with the pesticide passage holes alternately, and controlling the sealing of the pesticide passage holes, the pesticide can be sprayed in a pulsed manner. On the one hand, the pulsed flow fluctuations can reduce nozzle clogging caused by soil and other factors, ensuring the continuity and stability of spraying; on the other hand, when the small diameter orifices are aligned, the pipe space is filled, pre-storing energy for the high-pressure spraying of the large diameter orifices and reducing pressure drop. When the large diameter orifices are aligned, the pressure can be released instantly, achieving high-pressure spraying, increasing the pressure and effect of spraying, thereby effectively improving the efficiency and quality of spraying, and ensuring that the pesticide can act on the target area more evenly and efficiently.

[0085] In this embodiment, since the outer flange 651 of the pulse transition plate 650 is fixedly installed on the inner wall of the connector body 630, the pulse transition plate 650 has a through hole 653 in its middle part to facilitate the passage of the rotating shaft 300. The pulse transition plate has multiple large-diameter holes 653 and multiple small-diameter holes 654, and the multiple large-diameter holes 653 and small-diameter holes 654 are alternately distributed along the circumferential direction of the rotating shaft 300. The spray pipe 400 is connected to the through hole 311. When the lower end cap 640 of the pipe is rotated relative to the pulse transition plate 650, each of the large-diameter holes 653 and each of the small-diameter holes 654 is aligned with the through hole 311 in sequence. Thus, by The opening and closing of the through-hole is controlled by the change in orifice diameter and the blocking of the pulse transition plate, resulting in a fluctuating flow of the pesticide through the spray pipe 400, creating a pulsed spray effect. This reduces the problem of nozzle blockage caused by soil influence. When the through-hole is not aligned with a large orifice or a small orifice, the through-hole is blocked by the pulse transition plate, and the pesticide is in an energy storage state in the flow channel of the connector body. When the small orifice aligns with the through-hole, the pesticide liquid can enter the spray pipe and reduce the pressure in the flow channel of the connector body. However, at this time, it only replenishes the spray pipe with pesticide, not sprays it. Even if it cannot be filled, it can fill the space in the spray pipe to reduce the pressure drop when the large orifice is used for blasting spray. When the large orifice aligns with the through-hole, the spray pipe is equivalent to the nozzle opening, instantly releasing the pressure in the housing, thus ensuring a higher pressure spraying effect.

[0086] The aforementioned soil remediation equipment addresses the problems of insufficient deep soil agitation, inadequate mixing of chemicals and soil, severe dust generation, and excessive damage to soil aggregate structure in existing rotary tillers when treating heavy metal contaminated soil. This application's soil remediation equipment addresses these issues by placing a plow at the front of the frame to pre-disrupt the soil structure and reduce the resistance of subsequent tillage blades. The tillage blades mounted on the rotating shaft at the rear of the frame rotate at low speed to minimize damage to the soil aggregate structure. Simultaneously, a spray pipe located near the tillage blades on the rotating shaft sprays chemicals into the soil. This forms a synergistic structure of "plow pre-disruption – low-speed tillage – near-blade spraying," effectively achieving thorough agitation of the soil at a depth of approximately 50cm. This promotes uniform mixing of chemicals with both shallow and deep soil layers, suppresses secondary pollution caused by dust at the source, protects the soil aggregate structure, and balances soil remediation effectiveness with subsequent ecological restoration needs. In this soil remediation equipment, the plow at the front remains stationary, pre-disrupting the soil structure solely through its design. This significantly reduces the operating resistance of the rear tillage blades, allowing them to rotate at a low speed of approximately 100 rpm. This eliminates concerns about the blades failing to reach the deeper soil layers (around 50 cm) due to the low rotation speed, effectively reducing excessive damage to soil aggregates. Simultaneously, the spray pipes on the rear rotating shaft penetrate deep into the soil to spray the pesticide. This ensures that the pesticide mixes with the soil, no longer solely relying on the tillage blades' agitation, thus fully compensating for the insufficient mixing capacity of the low-speed blades. Furthermore, the spray depth can be flexibly controlled by adjusting the nozzle position. Combined with increasing the range or number of nozzles, this ensures thorough mixing of both shallow and deep soil layers with the pesticide. The nozzles' proximity to the tillage blades allows for rapid soil wetting with the pesticide, further preventing dust generation and comprehensively improving the soil remediation effect.

[0087] It should be noted that in soil remediation, chemical remediation and thermal desorption are the two mainstream methods. Thermal desorption is more expensive but can completely eliminate (99%) pollutants in the soil. However, thermal desorption can lead to soil sintering and the destruction of microorganisms, so the soil takes a long time to restore its ecology (e.g., to a cultivable state). Therefore, to restore the soil ecology more quickly, the mainstream method for treating heavy metal pollution is to use solidifying agents for chemical remediation. During the spraying of solidifying agents, the land needs to be tilled. However, existing rotary tillers have many shortcomings: 1. Tillage for soil remediation is different from tillage for agricultural planting. It needs to till the soil to a depth of about 50cm (heavy metal pollution layer). Although the rotary tillers on the market can operate to a depth of 50cm, the agitation of the deep soil is insufficient, making it more difficult for the agents to penetrate. 2. The remediation agent is sprayed on the surface, and the tillage equipment does not agitate the deep soil enough, resulting in insufficient mixing between the remediation agent and the soil, making it difficult to remediate the deep soil. 3. Severe dust pollution causes secondary pollution. The tillage process will severely disturb the dry soil and generate a large amount of dust containing heavy metals. 4. The high-speed rotating blades will excessively break up the soil aggregate structure, resulting in soil compaction, poor permeability, and reduced water and fertilizer retention capacity, which is not conducive to subsequent cultivation.

[0088] The key contradiction in addressing the above issues is that the slower the blade rotation speed, the worse the mixing effect, while a fast blade speed will lead to excessive breakage of the soil aggregate structure and severe dust generation.

[0089] This application utilizes the aforementioned soil remediation equipment. The plow at the front remains stationary, while a spraying pipeline is installed on the rotating shaft at the rear. The plow pre-damages the soil structure, reducing the resistance of the rear blades. This allows the blades to rotate at a low speed (approximately 100 rpm), eliminating concerns about them failing to reach deeper soil layers and effectively reducing soil aggregate disruption. The spraying system then penetrates deep into the soil, ensuring the pesticide mixes with the soil without relying solely on blade agitation. This effectively compensates for the insufficient mixing capacity of the low-speed blades. Furthermore, the spraying depth depends entirely on the nozzle position, allowing for an increase in the nozzle's coverage area or the number of nozzles, thus eliminating concerns about insufficient mixing only in deep or shallow soil layers. Simultaneously, the nozzles are extremely close to the blades, enabling rapid soil wetting and preventing dust generation.

[0090] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances. In the description of the embodiments of the present invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0091] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil remediation device, characterized in that, include: frame; A plow located in front of the frame is used to pre-damage the soil structure to reduce the operating resistance of subsequent tillage blades; A rotating shaft is located behind the frame and on the rear side of the plow, and a tillage blade is mounted on the rotating shaft. The tillage blade is configured to rotate at a preset low speed to reduce the damage to the soil aggregate structure. A spraying pipe is provided on the rotating shaft, the spraying pipe is provided with at least one nozzle, the nozzle is positioned close to the tiller to spray the agent into the soil during tilling operation, and the spraying pipe is connected to an external agent supply device. The spraying pipeline is connected to an external agent supply device at one end near the top of the rotating shaft via a rotary sealing joint. The rotary sealing joint has a rotational resistance torque of less than 0.5 N·m. The rotary sealing joint includes: A shaft-mounted adapter is fixed to the frame. The shaft-mounted adapter has a rotating adapter hole. A rotating shaft is nested and fitted into the rotating adapter hole. The rotating shaft is rotatable relative to the shaft-mounted adapter. A liquid supply upper cover is arranged around the circumferential outer side of the shaft-mounted adapter. The liquid supply upper cover is connected to the shaft-mounted adapter and is configured to connect with the delivery pipeline of an external liquid supply device. The hollow connector body has an internal flow channel for the flow of repair agents. The connector body is connected to the upper cover flange of the liquid supply. The connector body has an annular groove on its inner wall. The lower end cap of the pipeline connection is arranged around the outer circumference of the rotating shaft. The lower end cap of the pipeline connection is fixedly connected to the rotating shaft. The outer flange of the lower end cap of the pipeline connection is rotatably installed in the annular groove. The lower end cap of the pipeline connection is provided with a through-hole for passing pesticide. The spraying pipeline is screwed into the through-hole for passing pesticide and connected to the flow channel. The lower end cap of the pipeline is connected to a rotatable sealing ring between itself and the annular groove; the sealing ring is made of fluororubber resistant to chemical corrosion. The rotary sealing joint also includes a pulse transition plate, the outer flange of which is fixed to the inner wall of the joint body. The pulse transition plate has a through hole in the middle for the rotating shaft to pass through. The pulse transition plate has multiple large-diameter holes and multiple small-diameter holes, which are alternately distributed along the circumferential direction of the rotating shaft. When the lower end cap of the pipeline rotates relative to the pulse transition plate, the large and small diameter holes alternately align with the drug passage holes. The opening and closing of the drug passage holes are controlled by the change of the hole diameter and the sealing of the pulse transition plate, so that the agent flows through the spray pipeline in a flow fluctuation manner, forming a pulse spray. When the orifice is aligned with the drug passage, the orifice is blocked by the pulse transition plate, and the drug is in an energy storage state in the flow channel. When the small-diameter hole is aligned with the medicine hole, the medicine enters the spraying pipeline to replenish the medicine but is not sprayed, filling the pipeline space. When the large-diameter orifice aligns with the medicine hole, the spraying pipeline releases pressure to achieve high-pressure spraying.

2. The soil remediation equipment according to claim 1, characterized in that, The spraying pipeline is a hollow tube extending axially along the rotation axis, and the pipe wall of the spraying pipeline is formed into nozzles by laser cutting.

3. The soil remediation equipment according to claim 2, characterized in that, The minimum diameter of the nozzle is 5mm, and the angle between the length direction of the nozzle and the axis of rotation is 30 to 60 degrees. And / or, the length of the nozzle is 1 / 5 to 1 / 3 of the circumference of the spray pipe, and the nozzle edge is rounded with a radius of not less than 1 mm to reduce turbulence loss during agent spraying.

4. The soil remediation equipment according to claim 2, characterized in that, At least three spray pipes are fixed on each rotating shaft. All three spray pipes are fixed on the rotating shaft and are distributed circumferentially along the rotating shaft. The spraying directions of adjacent groups of nozzles form a 5-15cm overlapping coverage area in the soil depth direction.

5. The soil remediation equipment according to claim 1, characterized in that, The soil remediation equipment also includes a post-plow spraying pipeline located behind the plow. The post-plow spraying pipeline is fixed to the frame and located behind the plow. The post-plow spraying pipeline is equipped with nozzles facing the tillage blades. The spraying range of the nozzles is up to 180°. It is used to pre-spray the agent onto the tillage blade working area to help moisten the soil, and the agent is initially mixed with the soil through the mixing action of the tillage blades.

6. The soil remediation equipment according to claim 5, characterized in that, The number of nozzles in the post-plow spraying pipeline is 1-2, the horizontal distance between the nozzle and the plow is 10-20cm, and the angle between the spraying direction of the nozzle and the horizontal plane is 15-30°. And / or, the soil remediation equipment further includes a drive unit mounted on the frame, the drive unit driving the rotating shaft to rotate via a belt.

7. The soil remediation equipment according to claim 1, characterized in that, The facility is equipped with multiple plows and multiple tillage blades, with each plow corresponding to each of the rotating shafts, and the distance between adjacent plows is 30-50cm. And / or, the preset low speed of the tiller blade is 80-120 rpm; And / or, the tillage blade has an arc-shaped structure, the blade angle of the tillage blade is 20-30 degrees, and the distance between adjacent tillage blades in the rotation axis is 15-25cm; And / or, the minimum straight-line distance between the nozzle and the tillage blade is 5cm, and the spray direction of the nozzle is towards the working trajectory area of ​​the tillage blade, so as to realize the instantaneous mixing of the agent and the soil at the same time when the tillage blade stirs the soil, and to suppress dust by moistening the soil with the agent; And / or, the soil remediation equipment also includes a soil moisture sensor and a controller. The soil moisture sensor is located on the side of the frame near the tillage blades and is used to detect the real-time moisture of the soil in the working area. The controller is electrically connected to the soil moisture sensor and the delivery pump of the external agent supply device, and is configured to adjust the spraying flow rate of the agent according to the soil moisture. When the soil moisture is lower than a preset threshold, the spraying flow rate is increased to ensure that the soil moisture meets the dust suppression requirements. And / or, the frame is provided with a height adjustment mechanism, which is connected to the plow and the rotating shaft respectively, and is configured to adjust the soil penetration depth of the plow and the rotating shaft by hydraulic drive; And / or, the tiller blade is connected to the rotating shaft via a detachable structure, the detachable structure including bolts and locating pins, the end of the tiller blade being provided with a mounting hole adapted to the rotating shaft, the locating pin being used to restrict the circumferential rotation of the tiller blade, and the bolt being used for axial fixation; And / or, the working depth of the plow is 45-55cm, and the plow's soil-entry end is provided with a wedge-shaped cutting edge, the angle of the wedge-shaped cutting edge being 25-40 degrees.

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