An ecological remediation device and method for heavy metal contaminated soil.

Abstract

The invention discloses a soil treatment device for ecological restoration of heavy metal pollution and a treatment method thereof, which relates to the technical field of soil treatment, and comprises a mobile device and a soil treatment device, wherein a support seat is fixedly installed on the top of the mobile device, a treatment box is fixedly installed on the inner wall of the support seat, a spiral conveying device is fixedly installed on the surface of the treatment box, a rolling device is fixedly installed on the bottom of the mobile device, and an automatic door is fixedly installed on the top of the mobile device; wherein the soil treatment device comprises a motor, a stirring rod, a liquid storage box, a fixed rod, a water inlet, an elastic telescopic rod, an arc block and a drainage frame, wherein soil is transported into the treatment box by the spiral conveying device, and during the transportation process, the rotation of the motor drives the rotation of the stirring rod, and the soil inside the treatment box is crushed by the rotation of the stirring rod, and the soil is mixed better by intermittently adding the repair liquid, and resources can be saved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil treatment, and in particular to a soil treatment device for ecological restoration of heavy metal pollution and a treatment method thereof. Background Art

[0002] With the rapid development of the heavy metal industry, the amount of pollutants discharged from the factory area has increased day by day, resulting in an increase in the content of heavy metals in the soil year by year, causing very serious soil pollution. Soil pollution can lead to serious environmental problems, affecting human health and social development. Therefore, the treatment of polluted soil has become a major issue.

[0003] The patent with patent announcement number CN210936441U relates to a heavy metal contaminated soil treatment device using a biomass charcoal-clay composite repair agent, including a main body, a crushing device is arranged on the top left side of the main body, the crushing device is connected to the main body, the side wall of the crushing device is arranged with a power device, the side wall of the power device is arranged with a processing frame, and the processing frame is connected to the main body. The patent relates to the field of soil treatment technology. The heavy metal contaminated soil treatment device using a biomass charcoal-clay composite repair agent achieves the purpose of arranging a crushing device on the main body, crushing the soil first, and then discretizing it to increase the looseness of the soil, and then the power device works to drive the treated soil to an angle, and at the same time drives the baffle to move, intermittently release the composite agent, improve the mixing efficiency of the composite agent and the soil, thereby improving the heavy metal treatment effect, improving work efficiency, and meeting the purpose of use requirements.

[0004] In the above patent, the intermittent addition of the composite agent is used to improve the mixing efficiency of the composite agent and the soil, thereby improving the treatment effect of heavy metals, improving work efficiency, and meeting the purpose of use requirements. However, during the addition process, the composite agent cannot be evenly distributed, resulting in a poor mixing effect with the soil, affecting the soil remediation effect. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a soil treatment device and treatment method for ecological restoration of heavy metal pollution, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a soil treatment device for ecological restoration of heavy metal pollution, including a mobile device and a soil treatment device, wherein a support seat is fixedly installed on the top of the mobile device, a treatment box is fixedly installed on the inner wall of the support seat, a spiral conveying device is fixedly installed on the surface of the treatment box, a rolling device is fixedly installed on the bottom of the mobile device, and an automatic door is fixedly installed on the top of the mobile device; wherein the soil treatment device includes a motor, a stirring rod, a liquid storage box, a fixed rod, a water inlet, an elastic telescopic rod, an arc block and a drainage frame, and soil is transported into the treatment box by the spiral conveying device, and the delivery During the delivery process, the rotation of the motor will drive the stirring rod to rotate, and the soil inside the treatment box will be crushed by the rotation of the stirring rod. The motor is fixedly installed on the top of the treatment box, and the stirring rod is fixedly installed on the output end of the motor. The liquid storage box is fixedly installed on the top of the treatment box, and the fixed rod is fixedly installed on the circumferential surface of the stirring rod. The water inlet is slidably installed on the bottom of the inner wall of the liquid storage box, the elastic telescopic rod is fixedly installed on the bottom of the liquid storage box, the arc block is fixedly installed on the free end of the elastic telescopic rod, and the drainage frame is fixedly installed on the surface of the fixed rod. The rotation of the fixed rod will drive the drainage frame to rotate. The rotation of the drainage frame will be at the bottom of the water inlet, so that the repair liquid flows into the drainage frame.

[0007] According to the above technical solution, the arc block contacts the surface of the water inlet, a No. 1 spring is arranged between the water inlet and the liquid storage tank, and the water inlet is reset by the No. 1 spring, a drainage hole is opened on the surface of the drainage frame, a water inlet hole is opened on the surface of the water inlet, and a repair liquid is arranged inside the liquid storage tank.

[0008] The cam is provided with a plurality of connecting rods, a plurality of connecting rods are provided at the bottom of the movable device, and the plurality of connecting rods are provided with a plurality of connecting rods.

[0009] According to the above technical solution, a protrusion is fixedly installed on the surface of the long plate, and a short plate is fixedly installed on the inner wall of the filter box. When the long plate moves downward, the protrusion will be driven to move downward, and the protrusion will contact the short plate when it moves downward.

[0010] According to the above technical solution, the long plate is arranged below the fixed plate, and the protrusion is arranged on a side close to the short plate.

[0011] According to the above technical scheme, a screening device is provided at the bottom of the anti-accumulation device, and the screening device includes a round rod, a sliding plate, a rotating rod, a rotating plate and a limit block. The long plate moves downward to drive the round rod to move downward. The round rod moves downward and contacts the rotating plate, and the rotating plate is limited by the limit block, so that when the round rod moves downward, it pushes the rotating plate to move toward the inner wall of the filter box. The round rod is fixedly mounted on the surface of the long plate, the sliding plate is fixedly mounted on the free end of the elastic telescopic plate, the rotating rod is rotatably mounted on the inner wall of the sliding plate, the rotating plate is fixedly mounted on the circumferential surface of the rotating rod, and the limit block is fixedly mounted on the sliding plate.

[0012] According to the above technical solution, an arc plate is fixedly installed at the free end of the elastic telescopic plate, and a guide block is fixedly installed on the surface of the arc plate. The contraction of the free end of the elastic telescopic plate will drive the arc plate to move, and the movement of the arc plate will flatten the excessively high soil.

[0013] According to the above technical solution, the limit block contacts the surface of the rotating plate, and a No. 1 torsion spring is arranged between the sliding plate and the rotating rod, and the rotating rod is driven to reset by the No. 1 torsion spring.

[0014] A method for ecological restoration of heavy metal-contaminated soil treatment equipment comprises the following steps:

[0015] Step 1: The soil is transported into the treatment box through the spiral conveying device, and the stirring rod is driven to rotate by the rotation of the motor. The soil inside the treatment box is crushed by the rotation of the stirring rod to facilitate the mixing of the repair liquid and the soil;

[0016] Step 2: The stirring rod rotates to drive the fixed rod to rotate. During the rotation of the fixed rod, it contacts the arc block, and the fixed rod pushes the arc block to move upward;

[0017] Step 3: The arc block moves upward to drive the water inlet device to move upward. At the same time, when the fixing rod is separated from the arc block, the water inlet hole is sealed. By intermittently adding the repair liquid, the soil can be mixed better and resources can be saved;

[0018] Step 4: The fixed rod rotates to drive the drainage frame to rotate. The drainage frame rotates to the bottom of the water inlet, allowing the repair liquid to flow into the drainage frame. When the drainage frame rotates, the repair liquid slowly flows out through the drainage holes, so that the repair liquid is evenly distributed and mixed in the soil, improving the overall repair effect.

[0019] The present invention provides a soil treatment device and treatment method for ecological restoration of heavy metal pollution. It has the following beneficial effects:

[0020] (1) This invention uses a spiral conveying device to convey soil into a treatment box, and uses a stirring rod to grind the soil inside the treatment box, which is convenient for mixing the repair liquid with the soil. At the same time, intermittent addition of the repair liquid can make the soil mix better and save resources. The repair liquid is rotated by the drainage frame to slowly flow out through the drainage hole, so that the repair liquid is evenly distributed and mixed in the soil, thereby improving the overall repair effect.

[0021] (2) The invention rotates the stirring rod to make the threaded block reciprocate, and the threaded block moves downward to drive the long plate to push the soil toward the filter frame, thereby preventing the soil from piling up too high when the automatic door is opened, making it difficult for subsequent soil to enter the filter box. At the same time, the contact between the protrusion and the short plate generates vibration, causing the soil to fall through the sieve plate to the bottom, and then the soil is compacted by the compaction device to backfill the soil. There is no need for manual backfilling, thereby improving overall work efficiency.

[0022] (3) The invention drives the round rod downward by moving the long plate downward, so that the screen plate moves left and right. The left and right movement of the screen plate allows the soil to fall evenly, preventing too much soil from falling, which would cause the rolling device to fail to roll the soil flat and affect soil backfilling. At the same time, when the long plate is reset, it will drive the round rod upward to prevent the screen plate from continuously shaking during the reset process, which would reduce the service life of the elastic telescopic plate. At the same time, the contraction of the free end of the elastic telescopic plate will drive the arc plate to move. The movement of the arc plate will flatten the excessively high soil, preventing the soil from piling up too high and affecting the rolling device from flattening the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the processing box of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the liquid storage box of the present invention;

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of the filter box of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the sliding plate and the elastic telescopic plate of the present invention;

[0029] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure of part A.

[0030] In the figure: 1. moving device; 2. supporting seat; 3. processing box; 4. spiral conveying device; 5. rolling device; 6. automatic door; 7. motor; 71. stirring rod; 8. liquid storage box; 9. fixed rod; 10. water inlet; 11. elastic telescopic rod; 12. arc block; 13. drainage frame; 141. filter box; 142. elastic telescopic plate; 143. sieve plate; 144. connecting rod; 145. threaded block; 146. connecting shaft; 147. long plate; 148. fixed plate; 149. connecting rope; 1410. protrusion; 1411. short plate; 151. round rod; 152. sliding plate; 153. rotating rod; 154. rotating plate; 155. limit block; 156. arc plate; 157. guide block. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-4 One embodiment of the present invention is: a soil treatment device for ecological restoration of heavy metal pollution, including a mobile device 1, and also a soil treatment device, the mobile device 1 is fixedly installed with a support seat 2 on the top, the inner wall of the support seat 2 is fixedly installed with a treatment box 3, the surface of the treatment box 3 is fixedly installed with a spiral conveying device 4, the bottom of the mobile device 1 is fixedly installed with a rolling device 5, and the top of the mobile device 1 is fixedly installed with an automatic door 6; wherein the soil treatment device includes a motor 7, a stirring rod 71, a liquid storage box 8, a fixing rod 9, a water inlet 10, an elastic telescopic rod 11, an arc block 12 and a drainage frame 13, by intermittently adding a repair liquid, The soil is mixed better and resources can be saved. The motor 7 is fixedly installed on the top of the processing box 3, and a stirring rod 71 is fixedly installed on the output end of the motor 7. The liquid storage box 8 is fixedly installed on the top of the processing box 3, and the fixed rod 9 is fixedly installed on the circumferential surface of the stirring rod 71. The water inlet 10 is slidably installed on the bottom of the inner wall of the liquid storage box 8. The elastic telescopic rod 11 is fixedly installed on the bottom of the liquid storage box 8. The arc block 12 is fixedly installed on the free end of the elastic telescopic rod 11, and the drainage frame 13 is fixedly installed on the surface of the fixed rod 9. When the drainage frame 13 rotates, the repair liquid will slowly flow out through the drainage hole, so that the repair liquid is evenly distributed and mixed in the soil, thereby improving the overall repair effect.

[0033] The arc block 12 contacts the surface of the water inlet 10. A No. 1 spring is arranged between the water inlet 10 and the liquid storage box 8. The No. 1 spring drives the water inlet 10 to reset. A drainage hole is provided on the surface of the drainage frame 13. A water inlet hole is provided on the surface of the water inlet 10. A repair liquid is provided inside the liquid storage box 8.

[0034] A method for ecological restoration of heavy metal-contaminated soil treatment equipment comprises the following steps:

[0035] Step 1: The soil is transported into the treatment box 3 by the screw conveying device 4, and the stirring rod 71 is driven to rotate by the motor 7, and the soil inside the treatment box 3 is crushed by the stirring rod 71 to facilitate mixing of the repair liquid and the soil;

[0036] Step 2: The stirring rod 71 rotates to drive the fixed rod 9 to rotate. The fixed rod 9 contacts the arc block 12 during the rotation process, and the fixed rod 9 pushes the arc block 12 to move upward;

[0037] Step 3: The arc block 12 moves upward to drive the water inlet 10 to move upward. At the same time, when the fixing rod 9 is separated from the arc block 12, the water inlet hole is sealed. By intermittently adding the repair liquid, the soil is mixed better and resources can be saved;

[0038] Step 4: The fixed rod 9 rotates to drive the drainage frame 13 to rotate. The drainage frame 13 rotates to the bottom of the water inlet 10, so that the repair liquid flows into the drainage frame 13. When the drainage frame 13 rotates, the repair liquid slowly flows out through the drainage holes, so that the repair liquid is evenly distributed and mixed in the soil, thereby improving the overall repair effect.

[0039] When the present embodiment is working, the soil is transported into the treatment box 3 through the spiral conveying device 4. During the transportation process, the rotation of the motor 7 will drive the stirring rod 71 to rotate. The soil inside the treatment box 3 is crushed by the rotation of the stirring rod 71, which is convenient for mixing the repair liquid with the soil. At the same time, the rotation of the stirring rod 71 will drive the fixed rod 9 to rotate. During the rotation of the fixed rod 9, the fixed rod 9 will contact the arc block 12. The fixed rod 9 will push the arc block 12 to move upward. The upward movement of the arc block 12 will drive the water inlet 10 to move upward. The upward movement of the water inlet 10 will cause the inside of the liquid storage box 8 to The repair liquid flows out through the water inlet hole. At the same time, when the fixed rod 9 is separated from the arc block 12, the No. 1 spring will drive the water inlet 10 to reset and seal the water inlet hole. By intermittently adding the repair liquid, the soil can be better mixed and resources can be saved. At the same time, the rotation of the fixed rod 9 will drive the drainage frame 13 to rotate. The drainage frame 13 will be at the bottom of the water inlet 10 when it rotates, so that the repair liquid will flow into the drainage frame 13. When the drainage frame 13 rotates, the repair liquid will slowly flow out through the drainage hole, so that the repair liquid is evenly distributed and mixed in the soil, thereby improving the overall repair effect.

[0040] See also Figure 1-7On the basis of the above embodiment, in another embodiment of the present invention, an anti-deposit device is provided at the bottom of the mobile device 1, and the anti-deposit device includes a filter box 141, an elastic telescopic plate 142, a sieve plate 143, a connecting rod 144, a threaded block 145, a connecting shaft 146, a long plate 147, a fixed plate 148 and a connecting rope 149. The filter box 141 is fixedly mounted on the bottom of the mobile device 1, the elastic telescopic plate 142 is fixedly mounted on the bottom of the filter box 141, the sieve plate 143 is fixedly mounted on the free end of the elastic telescopic plate 142, and the connecting rod 144 is fixedly mounted on the filter box 14 1, a reciprocating spiral groove is provided on the surface of the stirring rod 71, a threaded block 145 is threadedly installed on the surface of the stirring rod 71, a sliding groove is provided on the inner wall of the filter box 141, a connecting shaft 146 is slidably installed on the inner wall of the sliding groove, a long plate 147 is fixedly installed on the surface of the connecting shaft 146, a fixed plate 148 is fixedly installed on the surface of the threaded block 145, one end of a connecting rope 149 is fixedly installed on the bottom of the fixed plate 148, and the other end of the connecting rope 149 is fixedly installed on the surface of the long plate 147, so as to prevent the soil from piling up too high when the automatic door 6 is opened, making it difficult for the subsequent soil to enter the filter box 141.

[0041] A protrusion 1410 is fixedly installed on the surface of the long plate 147, and a short plate 1411 is fixedly installed on the inner wall of the filter box 141. Vibration is generated by the contact between the protrusion 1410 and the short plate 1411, so that the soil passes through the screen plate 143 and falls to the bottom.

[0042] The long plate 147 is disposed below the fixing plate 148 , and the protrusion 1410 is disposed on a side close to the short plate 1411 .

[0043] A screening device is provided at the bottom of the anti-accumulation device, which includes a round rod 151, a sliding plate 152, a rotating rod 153, a rotating plate 154 and a limit block 155. The round rod 151 is fixedly mounted on the surface of the long plate 147, the sliding plate 152 is fixedly mounted on the free end of the elastic telescopic plate 142, the rotating rod 153 is rotatably mounted on the inner wall of the sliding plate 152, the rotating plate 154 is fixedly mounted on the circumferential surface of the rotating rod 153, and the limit block 155 is fixedly mounted on the sliding plate 152. The sieve plate 143 moves left and right to make the soil fall evenly, so as to prevent too much soil from falling, which will cause the rolling device 5 to fail to roll the soil flat and affect the soil backfilling.

[0044] An arc plate 156 is fixedly mounted on the free end of the elastic telescopic plate 142 , and a guide block 157 is fixedly mounted on the surface of the arc plate 156 to prevent the soil from piling up too high and affecting the rolling device 5 from leveling the soil.

[0045] The limit block 155 is in contact with the surface of the rotating plate 154 , and a first torsion spring is arranged between the sliding plate 152 and the rotating rod 153 , and the rotating rod 153 is driven to reset by the first torsion spring.

[0046] When this embodiment is working, the stirring rod 71 rotates to make the threaded block 145 reciprocate, and the reciprocating motion of the threaded block 145 will drive the fixed plate 148 to reciprocate, and when the fixed plate 148 moves downward, it will contact the long plate 147, and the fixed plate 148 moving downward will push the long plate 147 to move downward, and the long plate 147 moving downward will move along the direction of the slide slot, and the accumulated soil will be pushed to the edge of the filter box 141 by the long plate 147 to prevent the soil from piling up too high when the automatic door 6 is opened, making it difficult for subsequent soil to enter the filter box 141. At the same time, when the long plate 147 moves downward, it will drive the protrusion 1410 to move downward, and the protrusion 1410 moves downward and contacts the short plate 1411. The contact between the protrusion 1410 and the short plate 1411 generates vibration, so that the soil falls to the bottom through the screen plate 143, and then is rolled by the rolling device 5 to backfill the soil. There is no need to backfill manually, thereby improving the overall work efficiency.

[0047] The long plate 147 moves downward to drive the round rod 151 to move downward. The round rod 151 moves downward to contact the rotating plate 154. The rotating plate 154 is limited by the limit block 155, so that when the round rod 151 moves downward, it will push the rotating plate 154 to move in the direction close to the inner wall of the filter box 141. The movement of the rotating plate 154 in the direction close to the inner wall of the filter box 141 will drive the sliding plate 152 to move in the direction close to the inner wall of the filter box 141. The movement of the sliding plate 152 in the direction close to the inner wall of the filter box 141 will drive the free end of the elastic telescopic plate 142 to shrink. The shrinkage of the free end of the elastic telescopic plate 142 will drive the sieve plate 143 to move in the direction close to the inner wall of the filter box 141. The staggered design allows the long plate 147 to drive the sieve plate 143 to move left and right during the downward movement, so that the soil falls evenly through the left and right movement of the sieve plate 143, thereby preventing too much soil from falling, causing the rolling device 5 to fail to roll the soil flat and affect the soil backfilling. At the same time, when the long plate 147 is reset, it will drive the round rod 151 to move upward, and the upward movement of the round rod 151 will push the rotating plate 154 to rotate upward, thereby preventing the sieve plate 143 from continuously shaking during the reset process, thereby affecting the service life of the elastic telescopic plate 142. At the same time, when the free end of the elastic telescopic plate 142 contracts, it will drive the arc plate 156 to move, and the movement of the arc plate 156 will flatten the excessively high soil, thereby preventing the soil from piling up too high and affecting the rolling device 5 from paving the soil.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil treatment device for ecological restoration of heavy metal pollution, comprising a mobile device, characterized in that: It also includes a soil treatment device, a support base is fixedly installed on the top of the mobile device, a treatment box is fixedly installed on the inner wall of the support base, a spiral conveying device is fixedly installed on the surface of the treatment box, a rolling device is fixedly installed on the bottom of the mobile device, and an automatic door is fixedly installed on the top of the mobile device; The soil treatment device comprises a motor, a stirring rod, a liquid storage tank, a fixed rod, a water inlet, an elastic telescopic rod, an arc block and a drainage frame. The motor is fixedly mounted on the top of the treatment tank, the stirring rod is fixedly mounted on the output end of the motor, the liquid storage tank is fixedly mounted on the top of the treatment tank, the fixed rod is fixedly mounted on the circumferential surface of the stirring rod, the water inlet is slidably mounted on the bottom of the inner wall of the liquid storage tank, the elastic telescopic rod is fixedly mounted on the bottom of the liquid storage tank, the arc block is fixedly mounted on the free end of the elastic telescopic rod, and the drainage frame is fixedly mounted on the surface of the fixed rod; An anti-accumulation device is provided at the bottom of the moving device, and a screening device is provided at the bottom of the anti-accumulation device; The arc block contacts the surface of the water inlet, a spring is arranged between the water inlet and the liquid storage tank, a drainage hole is opened on the surface of the drainage frame, a water inlet hole is opened on the surface of the water inlet, and a repair liquid is arranged inside the liquid storage tank; The anti-accumulation device includes a filter box, an elastic telescopic plate, a screen plate, a connecting rod, a threaded block, a connecting shaft, a long plate, a fixed plate and a connecting rope. The filter box is fixedly installed at the bottom of the mobile device, the elastic telescopic plate is fixedly installed at the bottom of the filter box, the screen plate is fixedly installed at the free end of the elastic telescopic plate, the connecting rod is fixedly installed on the inner wall of the filter box, a reciprocating spiral groove is provided on the surface of the stirring rod, the threaded block is threadedly installed on the surface of the stirring rod, a slide groove is provided on the inner wall of the filter box, the connecting shaft is slidably installed on the inner wall of the slide groove, the long plate is fixedly installed on the surface of the connecting shaft, the fixed plate is fixedly installed on the surface of the threaded block, one end of the connecting rope is fixedly installed on the bottom of the fixed plate, and the other end of the connecting rope is fixedly installed on the surface of the long plate.

2. The soil treatment device for ecological restoration of heavy metal pollution according to claim 1 is characterized by: A convex block is fixedly installed on the surface of the long plate, and a short plate is fixedly installed on the inner wall of the filter box.

3. The soil treatment device for ecological restoration of heavy metal pollution according to claim 2 is characterized by: The long plate is arranged below the fixed plate, and the protrusion is arranged on a side close to the short plate.

4. The device for ecological restoration of heavy metal-contaminated soil according to claim 3, characterized in that: The screening device includes a round rod, a sliding plate, a rotating rod, a rotating plate and a limit block. The round rod is fixedly installed on the surface of the long plate, the sliding plate is fixedly installed on the free end of the elastic telescopic plate, the rotating rod is rotatably installed on the inner wall of the sliding plate, the rotating plate is fixedly installed on the circumferential surface of the rotating rod, and the limit block is fixedly installed on the sliding plate.

5. The device for ecological restoration of soil contaminated by heavy metals according to claim 4 is characterized by: The free end of the elastic telescopic plate is fixedly mounted with an arc plate, and the surface of the arc plate is fixedly mounted with a guide block.

6. The device for ecological restoration of heavy metal-contaminated soil according to claim 5, characterized in that: The limiting block contacts the surface of the rotating plate, and a first torsion spring is arranged between the sliding plate and the rotating rod.

7. A method for treating soil contaminated by heavy metals according to any one of claims 1 to 6, comprising the following steps: Step 1: The soil is transported into the treatment box through the spiral conveying device, and the stirring rod is driven to rotate by the rotation of the motor. The soil inside the treatment box is crushed by the rotation of the stirring rod to facilitate the mixing of the repair liquid and the soil; Step 2: The stirring rod rotates to drive the fixed rod to rotate. During the rotation of the fixed rod, it contacts the arc block, and the fixed rod pushes the arc block to move upward; Step 3: The arc block moves upward to drive the water inlet device to move upward. When the fixing rod is separated from the arc block, the water inlet hole is sealed. By intermittently adding the repair liquid, the soil can be mixed better and resources can be saved; Step 4: The fixed rod rotates to drive the drainage frame to rotate. The drainage frame rotates to the bottom of the water inlet, allowing the repair liquid to flow into the drainage frame. When the drainage frame rotates, the repair liquid slowly flows out through the drainage holes, so that the repair liquid is evenly distributed and mixed in the soil, improving the overall repair effect.

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