Ecological restoration system and method for heavy metal cadmium polluted soil

Abstract

The invention discloses an ecological remediation system and method for heavy metal cadmium contaminated soil, and belongs to the technical field of soil remediation. The system comprises a vehicle-mounted platform and soil loosening assemblies which are sequentially arranged on the vehicle-mounted platform and used for turning over and crushing the contaminated soil; the sowing assembly is used for sowing the enriched plant seeds into the soil; the covering assembly is used for leveling the soil and covering the enriched plant seeds with soil at the same time; the system is reasonable in structural design, can conduct plowing, sowing, earthing and irrigation treatment on the heavy metal cadmium contaminated soil at the same time, has a high system integration degree, improves the remediation efficiency of the heavy metal cadmium contaminated soil, has high use flexibility due to the movable system structure, and is suitable for popularization and application. The system does not generate secondary pollution in the operation process, is high in safety and is suitable for large-scale popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a system and method for ecological remediation of soil contaminated by heavy metal cadmium. Background Art

[0002] Cadmium contaminated soil is a serious environmental problem, which mainly comes from industrial waste discharge, atmospheric deposition, sewage irrigation and long-term application of phosphate fertilizers. Cadmium is a toxic heavy metal with strong mobility. It can accumulate in nature and cause environmental pollution and ecological imbalance. Cadmium contaminated soil can cause cadmium in the soil to enter the roots, stems and leaves of plants and eventually be ingested by humans, which may cause health problems such as osteoporosis, cancer and renal dysfunction.

[0003] At present, ecological restoration is a promising heavy metal contaminated soil remediation technology. It mainly utilizes the metabolism in plant life activities to enrich heavy metals in plants. By collecting and removing plants enriched with heavy metals and then treating them uniformly, the purpose of reducing the heavy metal content in the soil can be achieved.

[0004] However, in the existing technology, the ecological restoration system used for heavy metal cadmium contaminated soil has a relatively complex structure, which limits the flexibility and convenience of the system's use, and its scope of application is relatively limited, which invisibly increases the cost of remediation of contaminated soil; moreover, the existing system has a high operating energy consumption and does not meet the current development requirements of low-carbon and environmental protection. Summary of the invention

[0005] In view of the above-mentioned technical problems, the present invention provides a system and method for ecological restoration of soil contaminated by heavy metal cadmium.

[0006] The technical solution of the present invention is: a heavy metal cadmium polluted soil ecological restoration system, comprising a vehicle-mounted platform and a soil loosening component, a sowing component and a covering component sequentially arranged on the vehicle-mounted platform; an equipment box is arranged on the top of the vehicle-mounted platform, walking wheels are arranged at the four corners of the bottom surface of the vehicle-mounted platform, and a traction seat is arranged at the front end of the vehicle-mounted platform;

[0007] The loosening assembly includes a first mounting seat that is arranged through the vehicle-mounted platform, a rotating cylinder that is arranged on the lower bottom surface of the first mounting seat, and a driving motor that is arranged inside the first mounting seat and provides power for the rotating cylinder; mounting ear plates are arranged on both sides of the lower bottom surface of the first mounting seat; the rotating cylinder is rotatably clamped between the two mounting ear plates, and both ends of the rotating cylinder are provided with rotating shafts that penetrate the mounting ear plates at corresponding positions, and the two rotating shafts are connected to the first sprocket; a plurality of loosening rake components are evenly distributed on the outer wall of the rotating cylinder, and each loosening rake component includes a plurality of loosening rake teeth that are circumferentially distributed on the outer wall of the rotating cylinder; the two output ends of the driving motor are connected to the second sprocket, and the two second sprockets are respectively connected to the two first sprockets through chains in a one-to-one transmission connection;

[0008] The sowing assembly includes a material box arranged on the vehicle-mounted platform and located at the rear end of the first mounting seat, and an intermittent sowing component arranged on the outer side wall of the material box; a material drop bin penetrating the vehicle-mounted platform is arranged at the bottom end of the material box, and the intermittent sowing component is connected to the material drop bin;

[0009] The covering assembly includes a second mounting seat that is arranged through the vehicle-mounted platform and located at the rear end of the material box, several rotating grinding discs that are rotatably clamped at the bottom end of the second mounting seat, and a rotating motor that is arranged at the top inside the second mounting seat and provides power to each rotating grinding disc at the same time; a vertical pole that passes through the second mounting seat is arranged at the top of each rotating grinding disc, and a first bevel gear is connected to each vertical pole; a horizontal shaft is rotatably clamped inside the second mounting seat, and a second bevel gear that is respectively meshed and connected to each first bevel gear in a one-to-one correspondence is arranged on the horizontal shaft; a third sprocket is arranged on the horizontal shaft; the output end of the rotating motor is connected to a fourth sprocket, and the fourth sprocket and the third sprocket are connected by a chain transmission.

[0010] Furthermore, it also includes a sprinkler assembly arranged on the vehicle-mounted platform and located at the rear end of the second mounting seat; the sprinkler assembly includes a water tank arranged on the vehicle-mounted platform, an irrigation pipe arranged on the outer side wall of the equipment box and connected to the water tank, and a centrifugal pump arranged at the connection between the irrigation pipe and the water tank; an atomizing nozzle is connected to the irrigation pipe;

[0011] Note: When the vehicle-mounted platform moves, a centrifugal pump is used to spray the water inside the water tank through an atomizing nozzle onto the cadmium-contaminated soil, providing the water needed for the growth of enriched plants, which is beneficial to improving the remediation efficiency of cadmium-contaminated soil.

[0012] Furthermore, a through groove is provided on the side wall of the rotating cylinder and at the connection between the loosening rake teeth and the rotating cylinder, and a plurality of sieve holes are evenly distributed on the outer wall of the rotating cylinder; end covers located outside the first sprocket are provided on the two mounting ear plates; docking discs are rotatably clamped at both ends of the interior of the rotating cylinder, and several crushing rollers are rotatably clamped between the two docking discs, and auxiliary shafts penetrating the docking discs are provided at both ends of each crushing roller, and pinions are sleeved on each auxiliary shaft, and tooth grooves meshing with the pinions are provided on the inner wall of the rotating cylinder; and positioning rods are provided on the two docking discs that penetrate the rotating shafts at the corresponding positions and are fixedly connected to the end covers at the corresponding positions;

[0013] Description: During the rotation of the rotating drum, the soil enters the rotating drum through the through grooves, and at the same time, the tooth grooves drive the small gears to rotate, so that the crushing rollers rotate inside the rotating drum to crush the soil entering the rotating drum. The crushed soil is discharged through the sieve holes on the rotating drum, which is beneficial to the extension of the roots of the enriched plants in the soil and improves the enrichment effect of the enriched plants on the heavy metal cadmium in the soil.

[0014] Furthermore, a height adjustment frame connected to the first mounting seat and the second mounting seat is slidably engaged on the vehicle-mounted platform through a guide rod; an electric adjustment rod connected to the height adjustment frame is arranged on the top of the equipment box;

[0015] Description: The height adjustment frame is pulled by the electric adjustment rod to move on the guide rod, which is convenient for synchronous adjustment of the height of the loosening component and the covering component, and is conducive to improving the convenience of using the system.

[0016] Furthermore, a plurality of discharge pipes are equidistantly distributed at the bottom end of the material bin; the intermittent spreading component comprises a swing seat rotatably clamped on the outer wall of the material box through a mounting bracket, a servo motor arranged on the mounting bracket and providing power for the swing seat, a push plate movably hinged on the outer wall of the material box and located below the swing seat, and a plurality of baffle plates slidably clamped on the push plate and slidably clamped with each discharge pipe one by one; a plurality of collision rods are equidistantly distributed on the outer wall of the swing seat; both ends of the push plate are slidably clamped with reset rods movably plugged with the vehicle-mounted platform, and a reset spring is sleeved on the reset rod and abuts against the upper end surface of the vehicle-mounted platform; each baffle plate is provided with a material drop hole;

[0017] Description: The servo motor is used to drive the swing seat to rotate, and the push plate swings up and down along the hinge point between it and the material box under the collision action of the collision rod, so that each baffle plate moves on the vehicle-mounted platform, and the drop holes on the baffle plate are intermittently connected to the discharge pipe, so that the enriched plant seeds inside the material box are evenly sown into the contaminated soil.

[0018] Furthermore, the collision rod is rotatably connected with the swing seat, and a shock-absorbing rubber sleeve is provided on the outside of the collision rod;

[0019] Description: By rotating and clamping the collision rod and the swing seat, and at the same time sleeved the shock-absorbing rubber sleeve on the collision rod, it is helpful to reduce the friction resistance between the collision rod and the push plate.

[0020] The present invention also provides a method for ecological restoration of soil contaminated by heavy metal cadmium, based on the above-mentioned ecological restoration system for soil contaminated by heavy metal cadmium, comprising the following steps:

[0021] S1. Connect the vehicle-mounted platform to the external traction equipment through the traction seat, fill the material box with enriched plant seeds, and inject clean water into the water tank; use the electric adjustment rod to pull the height adjustment frame to move on the guide rod, and adjust the height of the loosening component and the covering component synchronously; then use the external traction equipment to drive the vehicle-mounted platform to move on the heavy metal cadmium contaminated plot;

[0022] S2. Using a driving motor to drive the second sprocket to rotate, so that the first sprocket drives the rotating drum to rotate under the transmission action of the chain, and the loosening rake teeth are used to plow the cadmium-contaminated soil during the rotation of the rotating drum; during the rotation of the rotating drum, the soil enters the rotating drum through the through grooves, and at the same time, the tooth grooves drive each small gear to rotate, so that each crushing roller rotates inside the rotating drum, and the soil entering the rotating drum is crushed, and the crushed soil is discharged through the sieve holes on the rotating drum.

[0023] S3. Use a servo motor to drive the swing seat to rotate, and push the plate to swing up and down along the hinge point between it and the material box under the collision action of the collision rod, so that each baffle plate moves on the vehicle-mounted platform, and the drop holes on the baffle plate are intermittently connected to the discharge pipe, so that the enriched plant seeds inside the material box are evenly sown into the contaminated soil;

[0024] S4, using a rotating motor to drive the fourth sprocket to rotate, because the fourth sprocket is connected to the third sprocket through a chain transmission, the horizontal axis rotates at this time, and under the meshing action of the second bevel gear and the first bevel gear, each rotating grinding disc rotates on the ground surface under the second mounting seat, so as to level the heavy metal contaminated soil and bury the enriched plant seeds in the contaminated soil; during the growth of the enriched plants, the above-ground stems and underground roots are used to enrich the heavy metal cadmium in the soil, so as to realize the ecological restoration of the heavy metal cadmium contaminated soil;

[0025] S5. During the movement of the vehicle-mounted platform, water is sprayed onto the cadmium-contaminated soil using the sprinkler assembly to provide the moisture required for the growth of enriched plants.

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

[0027] First, the system structure of the present invention is reasonably designed, and can simultaneously perform tillage, sowing, covering and irrigation treatments on heavy metal cadmium contaminated soil, and has a high system integration, which not only improves the remediation efficiency of heavy metal cadmium contaminated soil, but also the mobile system structure makes the present invention have high flexibility of use;

[0028] Second, the system of the present invention can realize in-situ ecological restoration of soil contaminated by heavy metal cadmium, with less interference to the environment, and no damage to the original ecological environment during the restoration process; moreover, no secondary pollution will be generated during the operation of the system, and the safety is relatively high;

[0029] Third, the present invention utilizes the absorption effect of enrichment plants to absorb and enrich heavy metal cadmium in the soil, which not only achieves the ecological restoration of heavy metal cadmium-contaminated soil, but also the growth of enrichment plants also has the effect of beautifying the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a longitudinal cross-sectional view of the system of the present invention;

[0031] Figure 2 is a front view of the system of the present invention;

[0032] Figure 3 It is a distribution diagram of the loosening rake teeth of the present invention on the rotating cylinder;

[0033] Figure 4 It is a schematic diagram of the connection between the crushing roller and the rotating drum of the present invention;

[0034] Figure 5 It is a distribution diagram of the loosening component, the sowing component and the covering component in the equipment box of the present invention;

[0035] Figure 6 It is a schematic diagram of the connection between the material baffle plate and the vehicle-mounted platform of the present invention;

[0036] Figure 7 It is a schematic diagram of the connection between the collision rod and the swing seat of the present invention;

[0037] Among them, 1-vehicle platform, 10-equipment box, 100-box door, 11-walking wheel, 12-traction seat, 2-soil loosening assembly, 20-first mounting seat, 200-mounting ear plate, 201-end cover, 21-rotating cylinder, 210-rotating shaft, 211-first sprocket, 212-through groove, 213-tooth groove, 22-drive motor, 220-second sprocket, 23-soil loosening rake component, 230-soil loosening rake teeth, 2300-cutting disc, 24-crushing roller, 240-docking plate, 241-auxiliary shaft, 242-pinion, 243-positioning rod, 3-seeding assembly, 30-material box, 300-dropping bin, 301-discharge pipe, 31-interval Intermittent sowing component, 310-mounting bracket, 311-swinging seat, 312-servo motor, 313-pushing plate, 314-blocking plate, 3140-dropping hole, 315-collision rod, 316-reset rod, 3160-reset spring, 4-covering component, 40-second mounting seat, 41-rotating grinding disc, 410-vertical pole, 411-first bevel gear, 42-rotating motor, 420-fourth sprocket, 43-horizontal axis, 430-second bevel gear, 431-third sprocket, 5-sprinkler assembly, 50-water tank, 51-irrigation pipe, 52-centrifugal pump, 53-atomizing nozzle, 6-height adjustment frame, 60-guide rod, 61-electric adjustment rod. DETAILED DESCRIPTION

[0038] Example 1

[0039] like Figure 1 , 2 A heavy metal cadmium contaminated soil ecological restoration system shown in the figure comprises a vehicle-mounted platform 1 and a soil loosening component 2, a sowing component 3 and a covering component 4 arranged on the vehicle-mounted platform 1 in sequence; an equipment box 10 is arranged on the top of the vehicle-mounted platform 1, walking wheels 11 are arranged at the four corners of the bottom surface of the vehicle-mounted platform 1, and a traction seat 12 is arranged at the front end of the vehicle-mounted platform 1;

[0040] like Figure 1 , 4As shown in Figures 5 and 6, the loosening assembly 2 includes a first mounting seat 20 that is arranged on the vehicle-mounted platform 1, a rotating cylinder 21 that is arranged on the lower bottom surface of the first mounting seat 20, and a driving motor 22 that is arranged inside the first mounting seat 20 and provides power for the rotating cylinder 21; mounting ear plates 200 are arranged on both sides of the lower bottom surface of the first mounting seat 20; the rotating cylinder 21 is rotatably clamped between the two mounting ear plates 200, and both ends of the rotating cylinder 21 are provided with a rotating shaft 210 that passes through the mounting ear plates 200 at corresponding positions, and the two rotating shafts 210 are connected to the first sprocket 211; a plurality of loosening rake components 23 are evenly distributed on the outer wall of the rotating cylinder 21, and each loosening rake component 23 includes a plurality of loosening rake teeth 230 that are circumferentially distributed on the outer wall of the rotating cylinder 21; the two output ends of the driving motor 22 are connected to the second sprocket 220, and the two second sprockets 220 are respectively connected to the two first sprockets 211 through chains in a one-to-one transmission connection;

[0041] like Figure 1 As shown, the sowing assembly 3 includes a material box 30 arranged on the vehicle-mounted platform 1 and located at the rear end of the first mounting seat 20, and an intermittent sowing component 31 arranged on the outer wall of the material box 30; a material drop bin 300 penetrating the vehicle-mounted platform 1 is arranged at the bottom end of the material box 30, and the intermittent sowing component 31 is connected to the material drop bin 300; the intermittent sowing component 31 adopts a lost product;

[0042] like Figure 1 , 5 As shown, the covering assembly 4 includes a second mounting seat 40 which is arranged on the vehicle-mounted platform 1 and located at the rear end of the material box 30, three rotating grinding discs 41 which are rotatably clamped at the bottom end of the second mounting seat 40, and a rotating motor 42 which is arranged at the top of the second mounting seat 40 and provides power to each rotating grinding disc 41 at the same time; a vertical rod 410 which passes through the second mounting seat 40 is arranged at the top of each rotating grinding disc 41, and a first bevel gear 411 is connected to each vertical rod 410; a horizontal shaft 43 is rotatably clamped inside the second mounting seat 40, and a second bevel gear 430 which is respectively meshed and connected with each first bevel gear 411 in a one-to-one correspondence is arranged on the horizontal shaft 43; a third sprocket 431 is arranged on the horizontal shaft 43; the output end of the rotating motor 42 is connected to the fourth sprocket 420, and the fourth sprocket 420 and the third sprocket 431 are connected by a chain transmission.

[0043] Example 2

[0044] This embodiment describes a method for ecological restoration of soil contaminated by heavy metal cadmium, and a system for ecological restoration of soil contaminated by heavy metal cadmium based on Embodiment 1, comprising the following steps:

[0045] S1, connecting the vehicle-mounted platform 1 to an external traction device through a traction seat 12, and filling the enriched plant seeds into the material box 30; using the external traction device to drive the vehicle-mounted platform 1 to move on the heavy metal cadmium contaminated plot; wherein the enriched plant seeds are centipede grass seeds;

[0046] S2, using the driving motor 22 to drive the second sprocket 220 to rotate, so that the first sprocket 211 drives the rotating drum 21 to rotate under the transmission action of the chain, and the loosening rake teeth 230 are used to plow the cadmium-contaminated soil during the rotation of the rotating drum 21;

[0047] S3, using the intermittent sowing component 31 to sow the enriched plant seeds inside the material box 30 into the soil;

[0048] S4. The fourth sprocket 420 is driven to rotate by the rotating motor 42. Since the fourth sprocket 420 is connected to the third sprocket 431 by a chain transmission, the horizontal shaft 43 rotates at this time, and under the meshing action of the second bevel gear 430 and the first bevel gear 411, each rotating grinding disc 41 rotates on the underground surface under the second mounting seat 40, so as to level the heavy metal contaminated soil and bury the enriched plant seeds in the contaminated soil; during the growth of the enriched plants, the above-ground stems and underground roots are used to enrich the heavy metal cadmium in the soil, so as to realize the ecological restoration of the heavy metal cadmium contaminated soil.

[0049] Example 3

[0050] The difference between this embodiment and the first embodiment is that six rotating grinding discs 41 are provided.

[0051] Example 4

[0052] The difference between the embodiment and embodiment 1 is that:

[0053] like Figure 1 As shown, it also includes a sprinkler assembly 5 arranged on the vehicle-mounted platform 1 and located at the rear end of the second mounting seat 40; the sprinkler assembly 5 includes a water tank 50 arranged on the vehicle-mounted platform 1, an irrigation pipe 51 arranged on the outer wall of the equipment box 10 and connected to the water tank 50, and a centrifugal pump 52 arranged at the connection between the irrigation pipe 51 and the water tank 50; an atomizing nozzle 53 is connected to the irrigation pipe 51; the centrifugal pump 52 is used to spray the water source inside the water tank 50 through the atomizing nozzle 53 to the cadmium-contaminated soil, so as to provide the enriched plants with the moisture required for growth.

[0054] Example 5

[0055] The difference between this embodiment and embodiment 4 is that:

[0056] like Figure 3 , 4As shown, a through groove 212 is provided on the side wall of the rotating cylinder 21 and at the connection between the loosening rake teeth 230 and the rotating cylinder 21, and a plurality of sieve holes are evenly distributed on the outer wall of the rotating cylinder 21; the two mounting ear plates 200 are provided with end covers 201 located outside the first sprocket 211; docking discs 240 are rotatably clamped at both ends of the interior of the rotating cylinder 21, and three crushing rollers 24 are rotatably clamped between the two docking discs, and auxiliary shafts 241 penetrating the docking discs 240 are provided at both ends of each crushing roller 24, and pinions 242 are sleeved on each auxiliary shaft 241, and tooth grooves 213 meshingly connected with the pinions 242 are provided on the inner wall of the rotating cylinder 21; the two docking discs 240 are provided with rotating shafts 210 penetrating at corresponding positions, and positioning rods 243 fixedly connected to the end covers 201 at corresponding positions;

[0057] Example 6

[0058] The difference between this embodiment and embodiment 5 is that:

[0059] like Figure 1 , 5 As shown, a height adjustment frame 6 connected to the first mounting seat 20 and the second mounting seat 40 is slidably engaged on the vehicle-mounted platform 1 through a guide rod 60; an electric adjustment rod 61 connected to the height adjustment frame 6 is arranged on the top of the equipment box 10;

[0060] Example 7

[0061] The difference between Example 6 and Example 6 is that:

[0062] like Figure 5 , 6 As shown in Figure 7, five discharge pipes 301 are evenly distributed at the bottom of the material bin 300; the intermittent spreading member 31 includes a swing seat 311 that is rotatably connected to the outer wall of the material bin 30 through a mounting bracket 310, a servo motor 312 that is arranged on the mounting bracket 310 and provides power to the swing seat 311, a push plate 313 that is movably hinged on the outer wall of the material bin 30 and located below the swing seat 311, and five sliding clamps on the push plate 313 and are one-to-one with each discharge pipe 301. A material baffle plate 314 is slidably engaged; a number of collision rods 315 are evenly spaced on the outer wall of the swing seat 311; both ends of the push plate 313 are slidably engaged with reset rods 316 that are movably plugged into the vehicle-mounted platform 1, and the reset rod 316 is sleeved with a reset spring 3160 that abuts against the upper end surface of the vehicle-mounted platform 1; each material baffle plate 314 is provided with a material drop hole 3140; the collision rod 315 is rotatably engaged with the swing seat 311, and a shock-absorbing rubber sleeve is sleeved on the outside of the collision rod 315.

[0063] Example 8

[0064] The difference between this embodiment and embodiment 7 is that:

[0065] like Figure 3 As shown, a cutting blade 2300 is provided on the loosening rake teeth 230 ; during the rotation of the rotating drum 21 , the cutting blade 2300 can be used to cut weeds, branches and other debris to prevent the weeds from being entangled on the rotating drum 21 and increasing the operating load of the driving motor 22 .

[0066] Example 9

[0067] The difference between Example 1 and Example 8 is that:

[0068] like Figure 2 As shown, a box door 100 is movably hinged on the side wall of the equipment box 10; by providing the box door 100, it is convenient to maintain various components inside the equipment box 10, which is beneficial to improving the convenience of using the system.

[0069] Example 10

[0070] This embodiment records a method for ecological restoration of soil contaminated by heavy metal cadmium, and a system for ecological restoration of soil contaminated by heavy metal cadmium based on Example 7, comprising the following steps:

[0071] S1. Connect the vehicle-mounted platform 1 to the external traction device through the traction seat 12, and fill the enriched plant seeds into the material box 30, and inject clean water into the water tank 50; use the electric adjustment rod 61 to pull the height adjustment frame 6 to move on the guide rod 60, and adjust the height of the loosening component 2 and the covering component 4 synchronously; then use the external traction device to drive the vehicle-mounted platform 1 to move on the heavy metal cadmium contaminated plot; wherein the enriched plant seeds are centipede grass seeds;

[0072] S2. The driving motor 22 is used to drive the second sprocket 220 to rotate, so that the first sprocket 211 drives the rotating drum 21 to rotate under the transmission action of the chain. During the rotation of the rotating drum 21, the loosening rake teeth 230 are used to plow the cadmium-contaminated soil; during the rotation of the rotating drum 21, the soil enters the rotating drum 21 through the through grooves 212, and at the same time, the tooth grooves 213 drive each pinion 242 to rotate, so that each crushing roller 24 rotates inside the rotating drum 21, and the soil entering the rotating drum 21 is crushed, and the crushed soil is discharged through the sieve holes on the rotating drum 21.

[0073] S3, using the servo motor 312 to drive the swing seat 311 to rotate, the push plate 313 swings up and down along the hinge point between it and the material box 30 under the collision action of the collision rod 315, so that each baffle plate 314 moves on the vehicle-mounted platform 1, and the drop holes 3140 on the baffle plate 314 are intermittently connected with the discharge pipe 301, so that the enriched plant seeds inside the material box 30 are evenly sown into the contaminated soil;

[0074] S4, using the rotating motor 42 to drive the fourth sprocket 420 to rotate, because the fourth sprocket 420 is connected to the third sprocket 431 through a chain transmission, the horizontal shaft 43 rotates at this time, and under the meshing action of the second bevel gear 430 and the first bevel gear 411, each rotating grinding disc 41 rotates on the ground surface under the second mounting seat 40, so as to level the heavy metal contaminated soil and bury the enriched plant seeds in the contaminated soil; during the growth of the enriched plants, the above-ground stems and underground roots of the enriched plants are used to enrich the heavy metal cadmium in the soil, so as to realize the ecological restoration of the heavy metal cadmium contaminated soil;

[0075] S5. During the movement of the vehicle-mounted platform 1, water is sprayed onto the cadmium-contaminated soil using the sprinkler assembly 5 to provide the moisture required for the growth of the enriched plants.

[0076] It should be noted that the drive motor 22, servo motor 312, rotary motor 42, centrifugal pump 52 and electric adjustment rod 61 used in the present invention all adopt existing technologies and are not specifically limited here. Those skilled in the art can select corresponding products according to actual needs.

Claims

1. A heavy metal cadmium contaminated soil ecological restoration system, characterized in that: It comprises a vehicle-mounted platform (1) and a soil loosening component (2), a sowing component (3) and a covering component (4) which are arranged in sequence on the vehicle-mounted platform (1); an equipment box (10) is arranged on the top of the vehicle-mounted platform (1); The loosening assembly (2) comprises a first mounting seat (20) penetratingly arranged on the vehicle-mounted platform (1), a rotating cylinder (21) arranged on the lower bottom surface of the first mounting seat (20), and a driving motor (22) arranged inside the first mounting seat (20) and providing power to the rotating cylinder (21); mounting ear plates (200) are arranged on both sides of the lower bottom surface of the first mounting seat (20), the rotating cylinder (21) is rotatably clamped between the two mounting ear plates (200), and a plurality of loosening rake components (23) are evenly distributed on the outer side wall of the rotating cylinder (21), and each of the loosening rake components (23) comprises a plurality of loosening rake teeth (230) circumferentially distributed on the outer side wall of the rotating cylinder (21); The sowing assembly (3) comprises a material box (30) arranged on the vehicle-mounted platform (1) and located at the rear end of the first mounting seat (20), and an intermittent sowing component (31) arranged on the outer side wall of the material box (30); a material drop bin (300) penetrating the vehicle-mounted platform (1) is arranged at the bottom end of the material box (30), and the intermittent sowing component (31) is connected to the material drop bin (300); The covering assembly (4) comprises a second mounting seat (40) which is arranged on the vehicle-mounted platform (1) and is located at the rear end of the material box (30), a plurality of rotating grinding discs (41) which are rotatably connected to the bottom end of the second mounting seat (40), and a rotating motor (42) which is arranged at the top of the second mounting seat (40) and provides power to each of the rotating grinding discs (41) at the same time.

2. A heavy metal cadmium contaminated soil ecological restoration system according to claim 1, characterized in that: It also comprises a sprinkler irrigation assembly (5) arranged on the vehicle-mounted platform (1) and located at the rear end of the second mounting seat (40); the sprinkler irrigation assembly (5) comprises a water tank (50) arranged on the vehicle-mounted platform (1), an irrigation pipe (51) arranged on the outer side wall of the equipment box (10) and connected to the water tank (50), and a centrifugal pump (52) arranged at the connection between the irrigation pipe (51) and the water tank (50); the irrigation pipe (51) is connected to an atomizing nozzle (53).

3. The heavy metal cadmium contaminated soil ecological restoration system according to claim 1 is characterized in that: A through groove (212) is provided on the side wall of the rotating cylinder (21) and at the connection between the loosening rake teeth (230) and the rotating cylinder (21); a plurality of sieve holes are evenly distributed on the outer wall of the rotating cylinder (21); both mounting ear plates (200) are provided with end covers (201) located outside the first sprocket wheel (211); docking plates (240) are rotatably clamped at both ends of the interior of the rotating cylinder (21); a plurality of crushing rollers (24) are rotatably clamped between the two docking plates, and each of the Both ends of the crushing roller (24) are provided with auxiliary shafts (241) penetrating the docking plate (240), each of the auxiliary shafts (241) is sleeved with a pinion gear (242), and the inner wall of the rotating cylinder (21) is provided with a tooth groove (213) meshingly connected with the pinion gear (242); and both docking plates (240) are provided with positioning rods (243) penetrating the rotating shafts (210) at corresponding positions and fixedly connected to the end covers (201) at corresponding positions.

4. A heavy metal cadmium contaminated soil ecological restoration system according to claim 3, characterized in that: The bottom end of the material bin (300) is provided with a plurality of discharge pipes (301) equidistantly distributed; the intermittent spreading member (31) comprises a swing seat (311) rotatably clamped on the outer wall of the material bin (30) through a mounting bracket (310), a servo motor (312) arranged on the mounting bracket (310) and providing power to the swing seat (311), a push plate (313) movably hinged on the outer wall of the material bin (30) and located below the swing seat (311), and a plurality of sliding clamps on the push plate (313). 3) and is slidably engaged with each of the discharge pipes (301) in a one-to-one correspondence; a plurality of collision rods (315) are equidistantly distributed on the outer wall of the swing seat (311); both ends of the push plate (313) are slidably engaged with a reset rod (316) movably engaged with the vehicle-mounted platform (1), and the reset rod (316) is sleeved with a reset spring (3160) abutting against the upper end surface of the vehicle-mounted platform (1); each of the baffle plates (314) is provided with a drop hole (3140).

5. A heavy metal cadmium contaminated soil ecological restoration system according to claim 4, characterized in that: The vehicle-mounted platform (1) is slidably engaged with a height adjustment frame (6) connected to both the first mounting seat (20) and the second mounting seat (40) via a guide rod (60); an electric adjustment rod (61) connected to the height adjustment frame (6) is arranged at the top of the equipment box (10).

6. A heavy metal cadmium contaminated soil ecological restoration system according to claim 4, characterized in that: The collision rod (315) is rotatably engaged with the swing seat (311), and a shock-absorbing rubber sleeve is sleeved on the outside of the collision rod (315).

7. A method for ecological restoration of soil contaminated by heavy metal cadmium, based on a system for ecological restoration of soil contaminated by heavy metal cadmium as claimed in claim 5, characterized in that: The following steps are involved: S1. Connect the vehicle-mounted platform (1) to an external traction device via a traction seat (12), and fill the material box (30) with enriched plant seeds, and inject clean water into the water tank (50); use the electric adjustment rod (61) to pull the height adjustment frame (6) to move on the guide rod (60), and synchronously adjust the height of the loosening component (2) and the covering component (4); then use the external traction device to drive the vehicle-mounted platform (1) to move on the heavy metal cadmium contaminated land; S2. The driving motor (22) is used to drive the rotating drum (21) to rotate. During the rotation of the rotating drum (21), the loosening rake teeth (230) are used to plow the cadmium-contaminated soil. During the rotation of the rotating drum (21), the soil enters the interior of the rotating drum (21) through the through grooves (212). At the same time, the tooth grooves (213) drive the small gears (242) to rotate, so that the crushing rollers (24) rotate inside the rotating drum (21), and the soil entering the interior of the rotating drum (21) is crushed. The crushed soil is discharged through the sieve holes on the rotating drum (21). S3, using the servo motor (312) to drive the swing seat (311) to rotate, and the push plate (313) swings up and down along the hinge point between it and the material box (30) under the collision action of the collision rod (315), so that each baffle plate (314) moves on the vehicle-mounted platform (1), and the drop holes (3140) on the baffle plate (314) are intermittently connected to the discharge pipe (301), so that the enriched plant seeds inside the material box (30) are evenly sown into the contaminated soil; S4, using a rotating motor (42) to drive each rotating grinding disc (41) to rotate on the underground surface under the second mounting seat (40), leveling the heavy metal contaminated soil, and burying the enrichment plant seeds in the contaminated soil; during the growth of the enrichment plants, the above-ground stems and underground roots of the enrichment plants are used to enrich the heavy metal cadmium in the soil, thereby achieving ecological restoration of the heavy metal cadmium contaminated soil; S5. During the movement of the vehicle-mounted platform (1), water is sprayed onto the cadmium-contaminated soil using the sprinkler assembly (5) to provide the enriched plants with the moisture they need for growth.

8. The heavy metal cadmium contaminated soil ecological restoration system according to claim 1, characterized in that: The collision rod (315) is sleeved with a shock-absorbing rubber sleeve.

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