Ex-situ mixing remediation device for agricultural heavy metal contaminated soil

Abstract

The invention discloses an ex-situ mixing remediation device for agricultural heavy metal contaminated soil. The ex-situ mixing remediation device comprises a box body as well as a crushing mechanism, a drying mechanism, a receiving mechanism, a spraying mechanism and a mixing mechanism which are sequentially arranged in the box body from top to bottom, the pair of drying mechanisms is arranged on the side wall of the box body in a mirroring mode, and the pair of bearing mechanisms is arranged on the side wall of the box body in a mirroring mode. Through the stirring mechanism and the swing mechanism arranged in the mixing and stirring mechanism, a good remediation effect can be achieved during mixing and stirring of soil and remediation liquid medicine; firstly, a stirring machine can swing and mix through a stirring arm and an adjusting arm when a main shaft rotates, and meanwhile, a scraping plate can lift soil on the bottom layer to the top layer to complete replacement and mixing; exchange and mixing of soil between the two stirring mechanisms can be achieved through the swing mechanism; furthermore, the material crushing mechanism can complete effective material crushing for the soil with relatively high viscosity, so that the defect that the clayed soil is easy to extrude into cakes by using a conventional crushing roller crushing mode is overcome.

Description

Technical Field

[0001] This invention belongs to the field of soil remediation technology, and specifically relates to an ex-situ mixed remediation device for agricultural heavy metal contaminated soil. Background Technology

[0002] Currently, soil pollution is severely damaging human survival resources. The ways and causes of pollution are diverse. Pollutants caused by rapid economic development and the production of industrialized commercial products are the main sources of soil pollution. Therefore, it is necessary to actively remediate polluted soil in order to protect land resources.

[0003] Common soil remediation methods include in-situ remediation and ex-situ remediation. In-situ remediation usually involves injecting remediation agents in situ, while ex-situ remediation usually involves transferring the soil to a remediation site and then mixing it with remediation agents for treatment.

[0004] A search revealed a device and method for microbial ex-situ remediation of organically contaminated soil, with prior art announcement number CN115921522A, comprising a main shaft, a drive device, a stirring rod, an air supply unit, and a dewatering and unloading unit. In this invention, the drive device drives the main shaft, and when the main shaft rotates, it supplies air to the gas channel through the air supply unit to achieve aeration inside the reactor shell, while the soil is discharged to the dewatering and unloading unit.

[0005] The main method is to mix the soil by driving the stirring rod with the main shaft and supplementing it with aeration; however, the feed port is located at the top of the reactor shell, and the stirring effect of the vertically set stirring rod and the main shaft is mainly aimed at the horizontal soil, making it difficult to achieve the displacement stirring between the top and bottom layers of the soil. The mixing effect between the upper and lower layers is poor, so most of the remediation material added by the feed port is stored in the top layer of the soil, and the process and effect of mixing to the bottom layer are poor.

[0006] After searching, it was found that another device with the above-mentioned shortcomings is a soil remediation leaching device with the existing technology announcement number CN214976641U. Soil is fed into the washing tank through the feed hopper, and leaching liquid is fed into the washing tank through the liquid addition pipe. The stepper motor is turned on, and the stepper motor drives the rotating shaft to rotate. The rotating shaft drives the stirring blade to stir the soil, so that the leaching liquid and soil are fully mixed. After the mixing is completed, two electric telescopic rods are opened. The electric telescopic rods drive the tank cover to move upward through the first connecting block. The tank cover drives the motor box and the stepper motor to move upward, which can drive the rotating shaft and the retaining ring to move upward, so that the retaining ring disengages from the through hole at the bottom of the washing tank, thereby facilitating the discharge of soil from the feed hopper.

[0007] During use, the method of rotating the shaft to drive the mixing blades to rotate and mix is ​​also effective for mixing soil in the horizontal direction, but relatively poor in the vertical direction, i.e., the mixing effect between the top and bottom layers of soil. Moreover, this structure is difficult to achieve the replacement and mixing of the top and bottom soils, whether it is used for soil leaching remediation or for soil remediation agent mixing. Therefore, it will reduce the effect of uniform mixing. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ex-situ mixing remediation device for agricultural heavy metal contaminated soil. Through the mixing mechanism and oscillating mechanism within the mixing system, a good remediation effect can be achieved during the mixing of soil and remediation solution. Firstly, the mixer can oscillate and mix the soil while the main shaft rotates via the mixing arm and adjusting arm, while the scraper can lift the bottom soil to the top layer to complete the replacement mixing. Furthermore, the oscillating mechanism can also achieve soil exchange and mixing between the two mixing mechanisms, achieving a uniform mixing effect. Furthermore, the crushing mechanism can effectively crush highly viscous soil, avoiding the drawback of using conventional crushing rollers to easily compress viscous soil into cakes.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] An ex-situ mixing remediation device for agricultural heavy metal contaminated soil includes a box and, from top to bottom, a crushing mechanism, a drying mechanism, a receiving mechanism, a spraying mechanism, and a mixing mechanism arranged sequentially inside the box. The drying mechanism has a pair mirror-image arranged on the side wall of the box, the receiving mechanism has a pair mirror-image arranged on the side wall of the box, and the spraying mechanism has a pair mirror-image arranged on the side wall of the box. Soil is transported to the top of the box via an external conveying mechanism, then cut and crushed by the crushing mechanism, dried by the drying mechanism, temporarily stored in the receiving mechanism, and then enters the mixing mechanism where it is sprayed with remediation agents in conjunction with the spraying mechanism. This mixing of the soil and remediation solution is then discharged. After discharge, the soil is transferred to an external holding box or conveying mechanism.

[0011] The mixing mechanism includes a stirring mechanism, a oscillating mechanism, an arc-shaped block, a partition block, and a third electric push rod; the arc-shaped block and the partition block are fixedly connected to the inner wall of the box, and a pair of arc-shaped blocks are respectively located on both sides of the partition block; a pair of stirring mechanisms are respectively located on both sides of the partition block; the third electric push rod is fixed to the outside of the box, and the top shaft of the third electric push rod is fixedly connected to a third sealing plate, with both ends of the third sealing plate located in the first support groove; the third electric push rod pushes the third sealing plate to close and open the discharge port between the arc-shaped block and the partition block.

[0012] The swing mechanism includes a mounting plate, a movable plate, a swing arm, a support arm, a second horizontal plate, and a hydraulic cylinder. The mounting plate has second fixed shafts at both ends, which are rotatably connected to the side walls of the housing. The mounting plate has a mounting groove, and third guide grooves are provided on both end faces of the mounting plate. A second sealing plate, fixed with bolts, is provided at the third guide groove to prevent soil from entering. A movable plate and a second spring are provided inside the mounting groove. Sliding blocks are provided at both ends of the movable plate and are located within the third guide groove. The second spring pushes the movable plate to slide within the mounting groove. A swing arm is fixedly connected to the second fixed shaft, and a second sliding groove is provided on the swing arm. The support arm is fixed to the side wall of the housing by a locking block, and the support arm is slidably connected to the locking block. A second adjusting shaft is provided at one end of the support arm and is located within the second sliding groove. A second horizontal plate is provided at the end of the support arm. The hydraulic cylinder is fixed to the side wall of the housing, and its top shaft is fixedly connected to the second horizontal plate. The hydraulic cylinder drives the support arm to slide, which in turn pulls the mounting plate to swing. The movable plate, which touches the partition block, is compressed and retracts into the mounting groove. The hydraulic cylinder is supplied with oil through an external oil station.

[0013] The stirring mechanism includes a fourth motor, a main shaft, a mounting frame, an adjusting arm, and a stirring arm. The main shaft is rotatably connected to the side wall of the housing, and the fourth motor is fixed to the outer wall of the housing via a motor mount. The output shaft of the fourth motor is connected to the main shaft. The main shaft is provided with several sets of mounting frames and a set of scrapers. The mounting frames are provided with a seventh through groove and a sixth through groove, and a first fixed shaft is provided at the sixth through groove. The two ends of the adjusting arm are located in the seventh through groove, and the end of the adjusting arm is provided with a pin. The pin is provided with a roller and is located in the first guide groove. Several stirring arms are provided, and one end of the stirring arm is rotatably connected to the adjusting arm via a third fixed shaft. The first fixed shaft and the third fixed shaft are staggered to form an included angle. The stirring arm is provided with a first sliding groove, and the stirring arm is located in the sixth through groove. The first fixed shaft is located in the first sliding groove.

[0014] The mounting frames are provided with mutually fixedly connected sector plates. A pair of telescopic plates are provided in the seventh channel and are respectively located on both sides of the adjusting arm to close the seventh channel and prevent soil from entering. The telescopic plates are existing technology. The sector plates, together with the mounting frames and telescopic plates, close the first guide channel to prevent soil from entering the first guide channel and affecting the movement of the rollers. The main shaft is driven to rotate by the fourth motor, which in turn drives the adjusting arm to move along the first guide channel, thereby causing the adjusting arm to move up and down along the seventh channel, and finally driving the mixing arm to swing.

[0015] The top of the box has a feed inlet. The side wall of the box has, from top to bottom, a limiting block, a first through groove, a second through groove, a third through groove, a second support groove, a fourth through groove, a first guide groove, a first support groove, and a support leg. There are a pair of first through grooves, which are mirror images of each other on the side wall of the box. There are a pair of second through grooves, which are mirror images of each other on the side wall of the box. There are a pair of third through grooves, which are mirror images of each other on the side wall of the box. There are a pair of second support grooves, which are mirror images of each other on the side wall of the box. There are a pair of first guide grooves, which are mirror images of each other on the side wall of the box. Each set has a pair. The support leg is located at the bottom of the box.

[0016] The shredding mechanism includes a control mechanism and cutting blades. Each cutting blade includes a blade holder with support blocks at both ends. A first adjusting shaft is mounted on each support block, and blades are mounted on both sides of the blade holder. Two sets of cutting blades are provided, each set containing several blades. The support blocks at both ends of one set of cutting blades are located in a first through groove, while the support blocks of the other set are located in a second through groove. The two sets of cutting blades are stacked vertically. Each end of the cutting blade is equipped with a control mechanism to ensure that both ends of the cutting blade are subjected to uniform force and move synchronously. The control mechanism includes a first motor, a first adjusting arm, a second adjusting arm, an adjusting plate, and a first guide shaft. The adjusting plate has an oblique, variable-pitch second guide groove. The slot is used to insert the first adjusting shaft; the first guide shaft is fixed on the adjusting plate and a limiting block is inserted; the first motor is fixed on the side wall of the box through the motor base, one end of the first adjusting arm is fixedly connected to the output shaft of the first motor, the other end of the first adjusting arm is rotatably connected to one end of the second adjusting arm, and the other end of the second adjusting arm is rotatably connected to the adjusting plate; the first motor drives the first adjusting arm and the second adjusting arm to rotate, thereby pulling the adjusting plate up and down along the first guide shaft, so that the first adjusting shaft slides left and right in the first through slot and the second through slot through the second guide slot to achieve the effect of aggregation and dispersion, and then the soil is broken into pieces by the aggregation of the cutter.

[0017] The drying mechanism includes a guide plate, a roller, a drying chamber, a channel, a second motor, a first fixing plate, and a second fixing plate. The guide plate is obliquely fixed to the side wall of the chamber. The roller is positioned above the guide plate and is hollow inside. First rotating shafts are located at both ends of the roller and rotatably connected to the chamber. A lever is mounted on one end of the first rotating shaft. The roller body also has a discharge port and a fifth through slot. The channel is located within a third through slot, and an arc-shaped plate is located at one end of the channel. This arc-shaped plate is located inside the roller to keep the fifth through slot closed during roller rotation. The drying chamber is fixed to the outer wall of the chamber via a base. The drying chamber has an opening that connects to the channel opening. A first sealing plate is located at the opening, and a connecting shaft is mounted on the first sealing plate. A first horizontal plate is mounted on the connecting shaft. A first electric push rod and a feeding port are located at the top of the drying chamber. An installation port is provided on the side wall of the drying chamber. The top shaft of the first electric push rod is connected to the first horizontal plate. The first electric push rod pushes the first horizontal plate to pull the first sealing plate up and down to open and close the opening. An inclined plate is provided inside the drying chamber so that the drying powder can slide along the inclined plate to the opening. A vibrator is provided on the inclined plate to vibrate and accelerate the sliding of the drying powder to prevent accumulation. The second motor is fixed to the side wall of the chamber through a motor base, and a lever is provided on the shaft of the second motor. The first fixed plate and the second fixed plate are respectively provided on both sides of the roller. The second fixed plate is provided with a first spring, and the two ends of the first spring are respectively fixedly connected to the lever and the second fixed plate. The first fixed plate is provided with a top shaft. A cover plate is fixedly connected to the side wall of the chamber above the roller to cover the roller and prevent the outlet from being blocked by soil. The drying powder here can be dry soil powder.

[0018] The receiving mechanism includes a receiving plate, a third motor, a support frame, and a lead screw. The receiving plate is inserted into a fourth through slot, and support blocks are provided on both sides of the receiving plate. The support blocks are located in a second support slot, and a fixing block is provided at one end of the receiving plate. The third motor is fixed to the outer wall of the box body through a motor base, and a gear is provided at the end of the shaft of the third motor. One end of the support frame is fixedly connected to the motor base of the third motor. The lead screw has through shafts at both ends, which are rotatably connected to the side wall of the box body and the support frame, respectively. The lead screw is threadedly connected to the fixing block. A gear is provided on the through shaft at one end of the lead screw. A transmission gear is provided between the lead screw and the third motor, and the gears mesh with each other for power transmission. The transmission gear is rotatably connected to the side wall of the box body and the motor base through a rotating shaft. The third motor drives the lead screw to rotate, thereby driving the receiving plate to slide in and out of the box body along the fourth through slot and the second support slot, realizing the support and unloading of the soil.

[0019] The spraying mechanism includes a spray box, a spray pipe, a second electric push rod, a third fixing plate, and a rack. The spray box is fixed to the side wall of the box body by a support base. The spray pipe is located inside the box body and is rotatably connected to the side wall of the box body by rotating shafts at both ends. A gear is provided on the through shaft at one end of the spray pipe. A water pump is provided inside the spray box, and the water pump is connected to the spray pipe through a connecting pipe. The third fixing plate is fixed to the box body, and the second electric push rod is fixed to the third fixing plate. The rack meshes with the gear at the end of the spray pipe. A second guide shaft is provided on the third fixing plate and is slidably connected to the rack. The top shaft of the second electric push rod passes through the third fixing plate and is fixedly connected to the rack. The second electric push rod pushes the rack to slide and drive the spray pipe to rotate, thereby adjusting the spray range of the spray pipe.

[0020] The specific steps of the soil remediation process are as follows;

[0021] 1) First, the soil is screened out by an external screening mechanism to remove larger stones. The external screening mechanism can use a metal mesh bag to monitor humidity and moisture to distinguish the soil properties and determine whether a drying mechanism is needed. Then, the soil enters the box through the feed inlet via an external conveying mechanism and is subsequently crushed by a crushing mechanism.

[0022] 2) The drying mechanism can absorb moisture by discharging the drying powder, which slides down the inclined plate and is accompanied by soil clods; at the same time, the speed of the second motor in the drying mechanism is set to 30-75 r / min.

[0023] 3) The receiving mechanism receives the soil falling from above;

[0024] 4) The spraying mechanism sprays the remediation solution. The initial spraying time is 25-30 seconds. The amount of agent added is set to 5%-10% of the mass of the contaminated soil to be treated, depending on the soil pollution situation. The soil moisture content is controlled at 8%-15%, measured by a soil moisture meter installed on the side wall of the tank. The fourth motor stirs at a speed of 15-35 r / min for 5-10 minutes. Spray again for 30-45 seconds, and then the fourth motor stirs again at a speed of 35-45 r / min for 8-15 minutes. The spraying speed is set according to the amount of agent added. Then the solution is discharged from the tank. After discharge, select an area to stand for 1-2 days before further treatment, including soil backfilling.

[0025] The advantages of this invention compared to existing technologies are as follows:

[0026] 1) This equipment can effectively cut and break down highly viscous soil through a crushing mechanism. The crushing mechanism uses a cutter to cut and break down soil clods, avoiding the drawback of conventional crushing rollers that easily compress viscous soil into cakes. Then, the drying mechanism absorbs and dries the moisture from the cut and broken soil clods. After the drying mechanism releases drying powder, the soil clods, carrying the drying powder, roll down the inclined plate and collide with each other, adhering to the drying powder, achieving the drying effect and preventing the soil clods from sticking together again. This allows the subsequent remediation solution to be more evenly absorbed by the soil, avoiding the situation where the original soil contains a lot of water, causing most of the agent to dissolve in water and resulting in less soil absorption. Finally, the mixing mechanism, in conjunction with the spraying of the remediation solution, mixes the soil to achieve stirring and absorption of the remediation solution in the soil.

[0027] 2) The mixing mechanism is equipped with a pair of mixing mechanisms to mix the soil and the remediation solution. The mixing mechanism is driven by a fourth motor to rotate the main shaft, which in turn drives the adjusting arm to move along the first guide groove. The first guide groove restricts the adjusting arm to move up and down along the seventh through groove, and finally drives the mixing arm to swing around the first fixed shaft. During the rotation and swinging process, the mixing of soil and remediation solution can be effectively assisted to achieve small-scale mixing. At the same time, the scraper can also scrape the soil at the bottom to the top, realizing the exchange of soil at the top and bottom and achieving large-scale mixing.

[0028] Furthermore, the swing mechanism installed between the mixing mechanisms enables the exchange of soil between the two mixing mechanisms within the box, achieving a wider range of soil exchange and mixing. During operation, the swing mechanism uses a hydraulic cylinder to control the support arm, pulling the swing arm to swing the mounting plate to one side. A movable plate at the top of the mounting plate, pushed by a second spring, extends and receives soil lifted by the scraper, rolling down the mounting plate to the other side. During rotation, the mixing arm presses against the movable plate at the top of the mounting plate, retracting into the mounting groove and passing over the swing mechanism. Similarly, when the swing mechanism swings to the other side, the mounting plate receives soil from the other side for mixing, achieving overall soil exchange. During the swing, the movable plate that contacts the partition retracts into the mounting groove without affecting the swing. The above application steps of the swing mechanism realize a mixing path resembling the symbol "∞", completing the mixing process from small-scale mixing by the mixing arm to mixing by the rotation of the mixing arm and scraper, and finally to large-scale soil exchange and mixing by the swing mechanism, resulting in a more uniform mixture of soil and remediation solution.

[0029] 3) The drying mechanism is equipped with a second motor, which drives the paddle to move the paddle plate, causing the roller to rotate at a certain angle. During the rotation, the arc plate on the channel can close the fifth channel to prevent material leakage. Then, the first spring pushes the roller to reset and hits the top shaft to generate vibration, making the dried powder fall more easily. At the same time, as the rotation angle of the roller changes, it will change the dispersion range of the dried powder at the outlet, making the dispersion relatively uniform. Then, the vibration of the vibrator allows the dried powder in the drying box to slide down smoothly for feeding. The falling soil rolls on the inclined plate, carrying the dried powder and reducing the mutual adhesion between them. Attached Figure Description

[0030] Appendix Figure 1 This is a schematic diagram of the internal structure of the box;

[0031] Appendix Figure 2 This is a schematic diagram of the structure of an ex-situ mixed remediation device for agricultural heavy metal contaminated soil according to the present invention;

[0032] Appendix Figure 3 This is a schematic diagram of the crushing mechanism;

[0033] Appendix Figure 4 This is a schematic diagram of the cutting knife;

[0034] Appendix Figure 5 This is a schematic diagram of the drying mechanism;

[0035] Appendix Figure 6 This is a cross-sectional schematic diagram of the drying mechanism;

[0036] Appendix Figure 7 This is a schematic diagram of the channel structure in the drying mechanism;

[0037] Appendix Figure 8 This is a structural diagram of the receiving mechanism;

[0038] Appendix Figure 9 This is a structural diagram of the casing and the spraying mechanism;

[0039] Appendix Figure 10 This is a schematic diagram of the mixing mechanism;

[0040] Appendix Figure 11 This is a front view of the mixing mechanism;

[0041] Appendix Figure 12 This is a schematic diagram of the swing mechanism;

[0042] Appendix Figure 13 This is a cross-sectional structural diagram of the mounting plate and the movable plate;

[0043] Appendix Figure 14 This is a schematic diagram of the end face structure of the mounting plate and the movable plate;

[0044] Appendix Figure 15 This is a schematic diagram of the stirring mechanism;

[0045] Appendix Figure 16 This is a schematic diagram of the soil mixing path when the oscillating mechanism participates in the work of the mixing mechanism;

[0046] In the diagram: 1. Box body; 101. Feed inlet; 102. Support leg; 103. First through groove; 104. Second through groove; 105. Third through groove; 106. Fourth through groove; 107. First guide groove; 108. First support groove; 109. Limiting block; 112. Second support groove;

[0047] 2. Shredding mechanism; 21. Control mechanism; 211. First motor; 212. First adjusting arm; 213. Second adjusting arm; 214. Adjusting plate; 215. First guide shaft; 216. Second guide groove; 22. Cutting blade; 221. Blade holder; 222. Support block; 223. First adjusting shaft; 224. Blade;

[0048] 3. Drying mechanism; 31. Guide plate; 32. Roller; 321. First rotating shaft; 322. Discharge port; 323. Fifth through groove; 324. Paddle plate; 33. Drying box; 331. Feed port; 332. Inclined plate; 333. Vibrator; 334. First sealing plate; 335. Connecting shaft; 3351. First horizontal plate; 336. First electric push rod; 337. Through port; 338. Mounting port; 34. Channel; 341. Arc plate; 35. Second motor; 351. Paddle block; 36. First fixing plate; 361. Top shaft; 37. Second fixing plate; 371. First spring; 38. Blind plate;

[0049] 4. Receiving mechanism; 41. Receiving plate; 411. Support block; 412. Fixing block; 42. Third motor; 43. Support frame; 44. Lead screw; 45. Transmission gear;

[0050] 5. Spraying mechanism; 51. Spraying box; 511. Connecting pipe; 52. Spraying pipe; 53. Second electric actuator; 54. Third fixing plate; 541. Second guide shaft; 55. Rack;

[0051] 6. Mixing mechanism; 61. Stirring mechanism; 611. Fourth motor; 612. Main shaft; 613. Mounting frame; 6131. ​​Sixth through groove; 6132. First fixed shaft; 614. Adjusting arm; 6141. Pin; 6142. Roller; 6143. Third fixed shaft; 615. Stirring arm; 6151. First chute; 616. Scraper; 617. Telescopic plate; 618. Seventh through groove; 619. Sector plate;

[0052] 62. Swinging mechanism; 621. Mounting plate; 6211. Second sealing plate; 6212. Second fixed shaft; 6213. Third guide groove; 622. Movable plate; 6221. Sliding block; 623. Swing arm; 6231. Second slide groove; 624. Support arm; 6241. Second adjusting shaft; 6242. Locking block; 625. Second horizontal plate; 626. Hydraulic cylinder; 627. Second spring; 628. Mounting groove; 63. Third electric push rod; 631. Third sealing plate; 64. Arc-shaped block; 65. Spacer. Detailed Implementation

[0053] To facilitate understanding by those skilled in the art, the following is a detailed explanation in conjunction with the appendix. Figure 1-16 The technical solution of the present invention will be further described in detail below.

[0054] Example 1:

[0055] An ex-situ mixed remediation device for agricultural heavy metal contaminated soil includes a housing 1 and, from top to bottom, a crushing mechanism 2, a drying mechanism 3, a receiving mechanism 4, a spraying mechanism 5, and a mixing mechanism 6 arranged sequentially inside the housing 1. A pair of drying mechanisms 3 are mirror-image arranged on the side wall of the housing 1; a pair of receiving mechanisms 4 are mirror-image arranged on the side wall of the housing 1; and a pair of spraying mechanisms 5 are mirror-image arranged on the side wall of the housing 1. Soil is transported to the top of the housing 1 via an external conveying mechanism, then cut and crushed by the crushing mechanism 2, dried by the drying mechanism 3, temporarily stored in the receiving mechanism 4, and then enters the mixing mechanism 6 where it is sprayed with chemicals in conjunction with the spraying mechanism 5. This mixing of the soil and the remediation solution is then discharged. After discharge, the soil is transferred to an external holding container or conveying mechanism.

[0056] The top of the box body 1 is provided with a feed inlet 101. The side wall of the box body 1 is provided with a limiting block 109, a first through groove 103, a second through groove 104, a third through groove 105, a second support groove 112, a fourth through groove 106, a first guide groove 107, a first support groove 108, and a support leg 102 from top to bottom. The first through groove 103 is provided in pairs and is mirrored on the side wall of the box body 1. The second through groove 104 is provided in pairs and is mirrored on the side wall of the box body 1. The third through groove 105 is provided in pairs and is mirrored on the side wall of the box body 1. The second support groove 112 is provided in pairs and is mirrored on the side wall of the box body 1. The first support groove 108 is provided in pairs and is mirrored on the side wall of the box body 1. The first guide groove 107 is provided in a set and is mirrored on the side wall of the box body 1. Each set has a pair. The support leg 102 is provided at the bottom of the box body 1.

[0057] The shredding mechanism 2 includes a control mechanism 21 and a cutting blade 22. The cutting blade 22 includes a blade holder 221, with support blocks 222 at both ends of the blade holder 221. A first adjusting shaft 223 is provided on the support blocks 222, and blades 224 are provided on both sides of the blade holder 221. The cutting blade 22 is provided in two sets, with several blades in each set. The support blocks 222 at both ends of one set of cutting blades 22 are located in a first through groove 103, and the support blocks 222 of the other set of cutting blades 22 are located in a second through groove 104. The two sets of cutting blades 22 are stacked vertically. Each end of the cutting blade 22 is provided with a control mechanism 21 to ensure that the two ends of the cutting blade 22 can be evenly stressed and move synchronously. The control mechanism 21 includes a first motor 211, a first adjusting arm 212, a second adjusting arm 213, an adjusting plate 214, and a first guide shaft 215. The adjusting plate 214 is provided with an oblique and variable-pitch second guide groove 21. 6. The second guide groove 216 is used to insert the first adjusting shaft 223; the first guide shaft 215 is fixed on the adjusting plate 214 and the limiting block 109 is inserted; the first motor 211 is fixed on the side wall of the housing 1 through the motor seat, one end of the first adjusting arm 212 is fixedly connected to the output shaft of the first motor 211, the other end of the first adjusting arm 212 is rotatably connected to one end of the second adjusting arm 213, and the other end of the second adjusting arm 213 is rotatably connected to the adjusting plate 214; the first motor 211 drives the first adjusting arm 212 and the second adjusting arm 213 to rotate, thereby pulling the adjusting plate 214 to move up and down along the first guide shaft 215, so that the first adjusting shaft 223 slides left and right in the first through groove 103 and the second through groove 104 through the second guide groove 216 to achieve the effect of aggregation and dispersion, and then the soil is broken into pieces by the aggregation of the cutter 22.

[0058] The drying mechanism 3 includes a guide plate 31, a roller 32, a drying chamber 33, a channel 34, a second motor 35, a first fixing plate 36, and a second fixing plate 37. The guide plate 31 is obliquely fixed to the side wall of the chamber 1. The roller 32 is located above the guide plate 31. The inside of the roller 32 is hollow. The roller 32 has a first rotating shaft 321 at both ends and is rotatably connected to the chamber 1. A deflector 324 is provided on one end of the first rotating shaft 321. The roller 32 body is also provided with a discharge port 322 and a fifth through groove 323. The channel 34 is located within the third through groove 105. One end of the channel 34 is provided with an arc-shaped plate 341, which is located inside the roller 32 to keep the fifth through groove 323 closed during roller 32 rotation. The drying chamber 33 is fixed to the outer wall of the chamber 1 via a base. The drying chamber 33 has an opening 337 that connects to the opening of the channel 34. A first sealing plate 334 is provided at the opening 337, and a connecting shaft 335 is provided on the first sealing plate 334. A first horizontal plate 3351 is provided on the connecting shaft 335. The top of the drying chamber 33 is provided with… There is a first electric actuator 336 and a feeding port 331. The drying chamber 33 has a mounting port 338 on its side wall. The top shaft of the first electric actuator 336 is connected to a first horizontal plate 3351. The first electric actuator 336 pushes the first horizontal plate 3351, pulling the first sealing plate 334 up and down to open and close the opening 337. An inclined plate 332 is provided inside the drying chamber 33 so that the dried powder can slide along the inclined plate 332 to the opening 337. A vibrator 333 is provided on the inclined plate 332 to vibrate and accelerate the sliding of the dried powder to prevent accumulation. The second... The motor 35 is fixed to the side wall of the housing 1 via a motor mount. The shaft of the second motor 35 is provided with a lever 351. The first fixing plate 36 and the second fixing plate 37 are respectively provided on both sides of the roller 32. The second fixing plate 37 is provided with a first spring 371. The two ends of the first spring 371 are respectively fixedly connected to the lever 324 and the second fixing plate 37. The first fixing plate 36 is provided with a top shaft 361. The upper part of the roller 32 is fixedly connected to the side wall of the housing 1 with a cover plate 38 to cover the roller 32 and prevent the discharge port 322 from being blocked by soil.

[0059] The receiving mechanism 4 includes a receiving plate 41, a third motor 42, a support frame 43, and a lead screw 44. The receiving plate 41 is inserted into a fourth through slot 106. Support blocks 411 are provided on both sides of the receiving plate 41, and the support blocks 411 are located in the second support slot 112. A fixing block 412 is provided at one end of the receiving plate 41. The third motor 42 is fixed to the outer wall of the housing 1 through a motor base. The shaft end of the third motor 42 is provided with a gear. One end of the support frame 43 is fixedly connected to the motor base of the third motor 42. The lead screw 44 is provided with through shafts at both ends and respectively The side wall of the rotating connection box 1 and the support frame 43 are connected by a screw 44 and a fixed block 412. A gear is provided on the shaft at one end of the screw 44. A transmission gear 45 is provided between the screw 44 and the third motor 42 and the gears mesh with each other for power transmission. The transmission gear 45 is rotatably connected to the side wall of the box 1 and the motor seat through a rotating shaft. The third motor 42 drives the screw 44 to rotate, which in turn drives the receiving plate 41 to slide in and out of the box 1 along the fourth through groove 106 and the second support groove 112, so as to realize the support and unloading of the soil.

[0060] The spraying mechanism 5 includes a spray box 51, a spray pipe 52, a second electric push rod 53, a third fixing plate 54, and a rack 55. The spray box 51 is fixed to the side wall of the box body 1 by a support base. The spray pipe 52 is located inside the box body 1 and is rotatably connected to the side wall of the box body 1 by rotating shafts at both ends. A gear is provided on the through shaft at one end of the spray pipe 52. A water pump is provided inside the spray box 51, and the water pump is connected to the spray pipe 52 through a connecting pipe 511. The third fixing plate 54 is fixed to the box body 1, and the second electric push rod 53 is fixed to the third fixing plate 54. The rack 55 meshes with the gear at the end of the spray pipe 52. A second guide shaft 541 is provided on the third fixing plate 54 and is slidably connected to the rack 55. The top shaft of the second electric push rod 53 passes through the third fixing plate 54 and is fixedly connected to the rack 55. The second electric push rod 53 pushes the rack 55 to slide and drive the spray pipe 52 to rotate, thereby adjusting the spray range of the spray pipe 52.

[0061] The mixing mechanism 6 includes a stirring mechanism 61, a swinging mechanism 62, an arc-shaped block 64, a partition block 65, and a third electric push rod 63. The arc-shaped block 64 and the partition block 65 are fixedly connected to the inner wall of the housing 1. A pair of arc-shaped blocks 64 are respectively located on both sides of the partition block 65. A pair of stirring mechanisms 61 are respectively located on both sides of the partition block 65. The third electric push rod 63 is fixed to the outside of the housing 1. The top shaft of the third electric push rod 63 is fixedly connected to a third sealing plate 631. Both ends of the third sealing plate 631 are located in the first support groove 108. The third electric push rod 63 pushes the third sealing plate 631 to close and open the discharge port between the arc-shaped block 64 and the partition block 65.

[0062] The swing mechanism 62 includes a mounting plate 621, a movable plate 622, a swing arm 623, a support arm 624, a second horizontal plate 625, and a hydraulic cylinder 626. The mounting plate 621 has second fixed shafts 6212 at both ends, which are rotatably connected to the side wall of the housing 1. The mounting plate 621 has a mounting groove 628, and third guide grooves 6213 on both end faces. A bolt-fixed second sealing plate 6211 is provided at the third guide groove 6213 to prevent soil from entering. The movable plate 622 and a second spring 627 are located within the mounting groove 628. Sliding blocks 6221 are located at both ends of the movable plate 622 and are positioned within the third guide groove 6213. The second spring 627 pushes the movable plate 622 to slide within the mounting groove 628. A swing arm 623 is fixedly connected to the second fixed shaft 6212. The swing arm 623 is provided with a second sliding groove 6231. The support arm 624 is fixed to the side wall of the housing 1 by a locking block 6242. The support arm 624 is slidably connected to the locking block 6242. One end of the support arm 624 is provided with a second adjusting shaft 6241 and is located in the second sliding groove 6231. The end of the support arm 624 is provided with a second horizontal plate 625. The oil cylinder 626 is fixed to the side wall of the housing 1. The top shaft of the oil cylinder 626 is fixedly connected to the second horizontal plate 625. The oil cylinder 626 drives the support arm 624 to slide, and then the swing arm 623 pulls the mounting plate 621 to swing. The movable plate 622 that touches the partition block 65 is squeezed and retracted into the mounting groove 628. The oil cylinder is supplied with oil through an external oil station.

[0063] The stirring mechanism 61 includes a fourth motor 611, a main shaft 612, a mounting frame 613, an adjusting arm 614, and a stirring arm 615. The main shaft 612 is rotatably connected to the side wall of the housing 1, and the fourth motor 611 is fixed to the outer wall of the housing 1 via a motor mount. The output shaft of the fourth motor 611 is connected to the main shaft 612. The main shaft 612 is provided with several sets of mounting frames 613 and a set of scrapers 616. The mounting frame 613 is provided with a seventh through groove 618 and a sixth through groove 6131, and a first fixed shaft 6132 is provided at the sixth through groove 6131. ​​The adjusting arm 614... 4. Both ends are located in the seventh through groove 618. The end of the adjusting arm 614 is provided with a pin 6141. The pin 6141 is provided with a roller and is located in the first guide groove 107. Several stirring arms 615 are provided. One end of the stirring arm 615 is rotatably connected to the adjusting arm 614 through the third fixed shaft 6143. The first fixed shaft 6132 and the third fixed shaft 6143 are staggered to form an included angle. The stirring arm 615 is provided with a first sliding groove 6151. The stirring arm 615 is located in the sixth through groove 6131. ​​The first fixed shaft 6132 is located in the first sliding groove 6151.

[0064] The mounting frames 613 are provided with mutually fixedly connected sector plates 619. A pair of telescopic plates 617 are provided in the seventh channel 618 and are respectively located on both sides of the adjusting arm 614 to close the seventh channel 618 and prevent soil from entering. The ends of the telescopic plates are respectively fixedly connected to the adjusting arm and the mounting frame and extend and retract as the adjusting arm slides. The telescopic plates 617 are existing technology. The sector plates, together with the mounting frames 613 and the telescopic plates 617, close the first guide channel 107 to prevent soil from entering the first guide channel 107 and affecting the movement of the roller 6142. The fourth motor 611 drives the main shaft 612 to rotate, thereby driving the adjusting arm 614 to move along the first guide channel 107, so that the adjusting arm 614 moves up and down along the seventh channel 618, and finally drives the mixing arm 615 to swing.

[0065] An ex-situ mixed remediation device for agricultural heavy metal contaminated soil, the specific working process of which is as follows.

[0066] In the process of soil remediation by mixing materials in situ, the soil is usually crushed first to facilitate mixing. This embodiment is designed for soil with high viscosity.

[0067] Before the soil is mixed, large stones are removed by an external metal mesh bag. Then, the soil is transported into the box 1 through an external soil conveying mechanism, including a conveyor belt. The soil then goes through a crushing mechanism 2, a drying mechanism 3, a receiving mechanism 4, a spraying mechanism 5, and a mixing mechanism 6 to achieve the ex-situ remediation process.

[0068] For highly viscous soils, this embodiment employs a crushing mechanism 2 to divide the viscous soil into small pieces, avoiding the drawback of using conventional crushing rollers which easily compress the viscous soil into cakes. First, the first motor 211 in the control mechanism 21 controls the first adjusting arm 212 and the second adjusting arm 213 to pull the adjusting plate 214 up and down along the first guide shaft 215. Then, the second guide groove 216 controls the first adjusting shaft 223 to move laterally within the first through groove 103 and the second through groove 104, thereby achieving the aggregation or dispersion of the cutter 22. Aggregation achieves the division of soil blocks by the cutter 22, and dispersion achieves automatic feeding of soil blocks by gravity, facilitating the next cutting and crushing.

[0069] To address the sticky nature of highly viscous soils, this embodiment also includes a drying mechanism 3. This mechanism reduces the stickiness of the soil by encapsulating drying powder within the soil clumps. The drying powder inside the drying chamber 33 enters the roller 32 along the inclined plate 332, the opening 337, and the channel 34, and is then discharged through the outlet 322 onto the inclined guide plate 31. Simultaneously, the second motor 35 drives the paddle block 351 to move the paddle plate 324, causing the roller 32 to rotate at a certain angle. During this rotation, the arc-shaped plate 341 on the channel 34 can close the gap. The fifth channel 323 prevents material leakage. Then, the first spring 371 pushes the roller 32 to reset and impacts the top shaft 361 to generate vibration, making it easier for the dry powder to fall. At the same time, as the roller 32 rotates, the change in rotation angle will change the dispersion range of the dry powder at the discharge port 322, making the dispersion relatively uniform. Then, the vibration of the vibrator 333 allows the dry powder in the drying box 33 to slide down smoothly for feeding. The falling soil rolls on the inclined plate 332, carrying the dry powder and reducing the mutual adhesion between them.

[0070] The receiving mechanism 4 is used to support the stored material. The third motor 42 drives the lead screw 44 to rotate, which in turn drives the receiving plate 41 to slide along the second support groove 112. When the mixing mechanism 6 below is mixing, the receiving mechanism 4 can temporarily store the material and wait for the mixing mechanism 6 below to mix. The material is discharged after the mixing mechanism 6 is emptied.

[0071] When the spraying mechanism 5 sprays, the water pump in the spray box 51 supplies the spray pipe 52 with the forest repair solution, and then the second electric push rod 53 pushes the rack to control the rotation of the spray pipe 52 to change the spray range and make the spray more uniform.

[0072] The mixing mechanism 6 and the spraying mechanism 5 operate simultaneously. When mixing the soil and the remediation solution, the main shaft 612 in the mixing mechanism 61 is driven to rotate by the fourth motor 611, which in turn drives the adjusting arm 614 to move along the first guide groove 107. The first guide groove 107 restricts the adjusting arm 614 to move up and down along the seventh through groove 618, and finally drives the mixing arm 615 to swing around the first fixed shaft 6132 as the axis, which assists in the mixing of soil and remediation solution. Furthermore, the telescopic plate 617 and the arc-shaped plate 619, together with the mounting frame 613, fit against the side wall of the box 1 to close the first guide groove 107 to prevent soil from entering and affecting the sliding of the roller 6142. The scraper 616 can turn the soil up to achieve the exchange of the bottom and top soil. In this process, the swing mechanism 62 can also be used to change the falling direction of the soil lifted by the scraper 616, so that the soil rolls down to one side along the swing mechanism 62, realizing the overall exchange of soil between the two mixing mechanisms 61, forming an exchange path like the symbol "∞", which greatly improves the mixing effect.

[0073] When the swing mechanism 62 is in operation, the hydraulic cylinder 626 controls the support arm 624 to pull the swing arm 623, causing the mounting plate 621 to swing to one side. The movable plate 622 at the top of the mounting plate 621 is pushed by the second spring 627 to receive the soil lifted by the scraper 616 and roll down the mounting plate 621 to the other side. When rotating, the mixing arm 615 will press against the movable plate 622 at the top of the mounting plate 621 and retract into the mounting groove 628, thus passing over the swing mechanism 62. Similarly, when the swing mechanism 62 swings to the other side, the mounting plate 621 will receive the soil on the other side for mixing, thus achieving the exchange of the overall soil. During the swing, the movable plate 622 that is in contact with the partition block 65 will retract into the mounting groove 628 without affecting the swing.

[0074] The specific steps of the soil remediation process are as follows;

[0075] 1) First, the soil is screened out by an external screening mechanism to remove larger stones. The external screening mechanism can use a metal mesh bag to monitor humidity and moisture to distinguish the soil properties and determine whether a drying mechanism is needed. Then, the soil enters the box through the feed inlet via an external conveying mechanism and is subsequently crushed by a crushing mechanism.

[0076] 2) The drying mechanism can absorb moisture by discharging the drying powder, which slides down the inclined plate and is accompanied by soil clods; the drying powder can be dry soil powder; at the same time, the speed of the second motor in the drying mechanism is set to 55 r / min.

[0077] 3) The receiving mechanism receives the soil falling from above;

[0078] 4) The spraying mechanism sprays the remediation solution. The initial spraying time is 25 seconds. The amount of agent added is set to 5.5% of the mass of the contaminated soil to be treated, based on the soil pollution situation. The soil moisture content is controlled at 9%, measured by a soil moisture meter installed on the side wall of the tank. The fourth motor stirs at 30 r / min for 6.5 minutes. Spray again for 30 seconds, and then the fourth motor stirs at 45 r / min for 10 minutes. The spraying speed is set according to the amount of agent added. Then the solution is discharged from the tank. After discharge, select an area to stand for 1 day before further treatment, including soil backfilling.

[0079] Example 2:

[0080] The difference from Example 1 is that this example is for dry soil and the drying mechanism is not used;

[0081] In step 4), the spraying time for the two spraying sessions is extended; the first spraying time is 30 seconds, and the amount of agent added is set to 4.5% of the mass of the contaminated soil to be treated, based on the soil pollution situation. The soil moisture content is controlled at 10%, measured by a soil moisture meter installed on the side wall of the box; the fourth motor stirs at a speed of 25 r / min for 7.5 minutes; spray again for 40 seconds, and then the fourth motor stirs again at a speed of 35 r / min for 14 minutes.

[0082] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0083] In summary, the electronic or electrical components, including but not limited to electric actuators and motors, are existing components that are custom-made or purchased. The electrical connections between these components are conventional circuit or electrical connections in the prior art and are not within the scope of protection of this invention.

[0084] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An ex situ mixed remediation device for agricultural heavy metal contaminated soil, comprising a box body and a crushing mechanism, a drying mechanism, a receiving mechanism, a spraying mechanism, and a mixing mechanism arranged in sequence from top to bottom inside the box body; characterized in that The drying mechanism is provided with a pair of mirror-imaged blocks on the side wall of the box body, the receiving mechanism is provided with a pair of mirror-imaged blocks on the side wall of the box body, and the spraying mechanism is provided with a pair of mirror-imaged blocks on the side wall of the box body; the mixing mechanism includes a stirring mechanism, a swinging mechanism, an arc block, a spacer, and a third electric push rod; the arc block and the spacer are fixedly connected to the inner wall of the box body, and a pair of arc blocks are provided and respectively arranged on both sides of the spacer; the stirring mechanism is provided with a pair and respectively arranged on both sides of the spacer; the third electric push rod is fixed to the outside of the box body, and the top shaft of the third electric push rod is provided with a fixedly connected third sealing plate, and both ends of the third sealing plate are arranged in the first supporting groove; the third sealing plate is pushed by the third electric push rod to close and open the feeding port between the arc block and the spacer; The swing mechanism comprises a mounting plate, a movable plate, a swing arm, a support arm, a second cross plate, and an oil cylinder; two ends of the mounting plate are provided with a second fixed shaft, and the second fixed shaft is rotatably connected to the side wall of the box body; a mounting groove is provided on the mounting plate, and end surfaces of both sides of the mounting plate are provided with a third guide groove; a second sealing plate fixed with bolts is provided at the third guide groove to prevent soil from entering; a movable plate and a second spring are provided in the mounting groove, and sliding blocks are provided at both ends of the movable plate and are arranged in the third guide groove; the second spring pushes the movable plate to slide in the mounting groove; a swing arm fixedly connected is provided on the second fixed shaft, and a second slide groove is provided on the swing arm, and the support arm is fixed to the side wall of the box body through a clamping block, and the support arm is slidably connected to the clamping block; a second adjusting shaft is provided at one end of the support arm and is arranged in the second slide groove; a second cross plate is provided at the end of the support arm, and the oil cylinder is fixed to the side wall of the box body, and the oil cylinder top shaft is fixedly connected to the second cross plate; the support arm is driven to slide by the oil cylinder, and then the mounting plate is pulled to swing by the swing arm, and the movable plate that touches the spacer block is squeezed and retracted into the mounting groove; the oil cylinder is supplied with oil through an external oil station; The stirring mechanism includes a fourth motor, a main shaft, a mounting frame, an adjusting arm, and a stirring arm; the main shaft is rotatably connected to the side wall of the box body, and the fourth motor is fixed to the outer wall of the box body through a motor seat; the output shaft of the fourth motor is connected to the main shaft; a plurality of mounting frames and a plurality of scrapers are provided on the main shaft; a seventh through slot and a sixth through slot are provided on the mounting frame, and a first fixed shaft is provided at the sixth through slot; both ends of the adjusting arm are arranged in the seventh through slot, a pin is provided at the end of the adjusting arm, a roller is provided on the pin and is arranged in the first guide slot; a plurality of stirring arms are provided, one end of the stirring arm is rotatably connected to the adjusting arm through a third fixed shaft, the first fixed shaft and the third fixed shaft are staggered to form an angle, a first slide slot is provided on the stirring arm, the stirring arm is arranged in the sixth through slot, and the first fixed shaft is arranged in the first slide slot; The soil remediation steps of the remediation device are as follows; 1) First, the soil is screened out of the larger stones through an external screening mechanism. The external screening mechanism can use a metal net bag to monitor the humidity and moisture to distinguish them, so as to determine the nature of the soil and then decide whether the drying mechanism is needed to participate in the work; then the soil enters the box along the feed port through the external conveying mechanism, and then is crushed by the crushing mechanism; 2) The drying mechanism can absorb moisture by discharging drying powder and sliding it down the inclined plate along with the soil blocks; at the same time, the speed of the second motor in the drying mechanism is set to 30-75r / min; 3) The receiving mechanism receives the soil falling from above; 4) The spraying mechanism sprays the repair liquid, the first spraying time is 25-30s, the amount of agent added is set to 5%-10% of the mass of the contaminated soil to be treated according to the soil pollution situation, the soil moisture content is controlled at 8%-15%, and it is measured by a soil moisture meter installed on the side wall of the box; the fourth motor stirs at a speed of 15-35r / min for 5-10 minutes; spray again for 30-45s and then the fourth motor stirs at a speed of 35-45r / min for 8-15 minutes, and the spraying speed is set according to the amount of agent added; then discharge from the box; after discharge, select an area to stand for 1-2 days before processing, including soil backfilling.

2. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that The installation frames are provided with fan-shaped plates fixedly connected to each other, a pair of telescopic plates are provided in the seventh through slot and are respectively arranged on both sides of the adjusting arm and close the seventh through slot to prevent soil from entering, and the telescopic plates are prior art; the fan-shaped plates cooperate with the installation frames and the telescopic plates to close the first guide slot to prevent soil in the first guide slot from affecting the walking of the roller; the fourth motor drives the main shaft to rotate and then drives the adjusting arm to move along the first guide slot, so that the adjusting arm moves up and down along the seventh through slot, and finally drives the stirring arm to swing.

3. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that A feed port is provided on the top of the box body, and a limit block, a first through slot, a second through slot, a third through slot, a second supporting slot, a fourth through slot, a first guide slot, a first supporting slot, and a supporting leg are provided on the side walls of the box body from top to bottom in sequence; a pair of first through slots are provided and are mirror-imaged on the side walls of the box body, a pair of second through slots are provided and are mirror-imaged on the side walls of the box body, a pair of third through slots are provided and are mirror-imaged on the side walls of the box body, a pair of second supporting slots are provided and are mirror-imaged on the side walls of the box body, and a pair of first supporting slots are provided and are mirror-imaged on the side walls of the box body; a group of first guide slots are provided and are mirror-imaged on the side walls of the box body, each group is provided with a pair, and the supporting legs are provided at the bottom of the box body.

4. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that The material-crushing mechanism comprises a control mechanism and a cutting knife, the cutting knife comprises a knife frame, support blocks are arranged at both ends of the knife frame, a first adjusting shaft is arranged on the support blocks, and blades are arranged on both sides of the knife frame; the cutting knife is provided with two groups, each group is provided with a plurality of support blocks at both ends of one group of cutting knives, wherein the support blocks at both ends of the cutting knives of one group are arranged in the first through groove, and the support blocks of the other group of cutting knives are arranged in the second through groove; the two groups of cutting knives are arranged in an upper and lower stack; a group of control mechanisms is arranged at each end of the cutting knives to ensure that the two ends of the cutting knives can be evenly stressed and move synchronously; the control mechanism comprises a first motor, a first adjusting arm, a second adjusting arm, an adjusting plate, and a first guide shaft; the adjusting plate is provided with an oblique and variable-pitch second guide groove, and the second guide The groove is used to plug in the first adjusting shaft; the first guide shaft is fixed on the adjusting plate and plugged in the limit block; the first motor is fixed to the side wall of the box body through the motor seat, one end of the first adjusting arm is fixedly connected to the output shaft of the first motor, the other end of the first adjusting arm is rotatably connected to one end of the second adjusting arm, and the other end of the second adjusting arm is rotatably connected to the adjusting plate; the first motor drives the first adjusting arm and the second adjusting arm to rotate, and then pulls the adjusting plate to move up and down along the first guide shaft, so that the first adjusting shaft slides left and right in the first through slot and the second through slot through the second guide groove to achieve the effect of aggregation and dispersion, and then the soil is cut into pieces by the aggregation of the cutting knife.

5. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that The drying mechanism includes a guide plate, a roller, a drying box, a channel, a second motor, a first fixed plate, and a second fixed plate; the guide plate is obliquely fixed to the side wall of the box body, the roller is arranged above the guide plate, the interior of the roller is set to be hollow, and first rotating shafts are arranged at both ends of the roller and are rotatably connected to the box body; a paddle is arranged on the first rotating shaft at one end; a discharge port and a fifth through groove are also arranged on the roller body; the channel is arranged in the third through groove, and an arc plate is arranged at one end of the channel, and the arc plate is arranged inside the roller to always close the fifth through groove when the roller rotates; the drying box is fixed to the outer wall of the box body through a base, and a through opening is arranged inside the drying box and docked with the channel opening; a first sealing plate is arranged at the through opening, a connecting shaft is arranged on the first sealing plate, a first horizontal plate is arranged on the connecting shaft, and a first through groove is arranged on the top of the drying box An electric push rod and a feeding port, a mounting port is provided on the side wall of the drying box, the top shaft of the first electric push rod is connected to the first horizontal plate, and the first electric push rod pushes the first horizontal plate to pull the first sealing plate to move up and down to open and close the opening; an inclined plate is provided in the drying box so that the dry powder can slide along the inclined plate to the opening; a vibrator is provided on the inclined plate to vibrate and accelerate the sliding of the dry powder to avoid accumulation; the second motor is fixed to the side wall of the box through a motor seat, and a shift block is provided on the second motor shaft; the first fixed plate and the second fixed plate are respectively arranged on both sides of the roller, and the second fixed plate is provided with a first spring, and the two ends of the first spring are respectively fixedly connected to the shift plate and the second fixed plate, and the first fixed plate is provided with a top shaft; the shield plate fixedly connected to the side wall of the box above the roller is used to shield the roller to prevent the discharge port from being blocked by soil.

6. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that The receiving mechanism includes a receiving plate, a third motor, a support frame, and a lead screw. The receiving plate is inserted into the fourth through slot, support blocks are provided on both sides of the receiving plate, the support blocks are arranged in the second support slot, and a fixed block is provided at one end of the receiving plate; the third motor is fixed to the outer wall of the box body through a motor seat, a gear is provided at the shaft end of the third motor, and one end of the support frame is fixedly connected to the motor seat of the third motor; through shafts are provided at both ends of the lead screw and are rotatably connected to the side walls of the box body and the support frame respectively, and the lead screw is threadedly connected to the fixed block; a gear is provided on the through shaft at one end of the lead screw, a transmission gear is provided between the lead screw and the third motor, and the gears are meshed with each other for power transmission, and the transmission gear is connected to the side wall of the box body and the motor seat through a rotating shaft, and the third motor drives the lead screw to rotate, and then drives the receiving plate to slide in and out of the box body along the fourth through slot and the second support slot, so as to realize the support and unloading of the soil.

7. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that The spray mechanism includes a spray box, a spray pipe, a second electric push rod, a third fixed plate, and a rack; the spray box is fixed to the side wall of the box body through a support seat, the spray pipe is arranged in the box body and is rotatably connected to the side wall of the box body through rotating shafts at both ends, and a gear is arranged on the through shaft at one end of the spray pipe; a water pump is arranged in the spray box, and the water pump is connected to the spray pipe through a connecting pipe; the third fixed plate is fixed to the box body, the second electric push rod is fixed to the third fixed plate, and the rack meshes with the gear at the end of the spray pipe; a second guide shaft is arranged on the third fixed plate and is slidably connected to the rack; the top shaft of the second electric push rod passes through the third fixed plate and is fixedly connected to the rack; the second electric push rod pushes the rack to slide and drives the spray pipe to rotate, so as to adjust the spray range of the spray pipe.

8. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that In step 2), the drying mechanism can absorb moisture by discharging drying powder and sliding it down the inclined plate along with the soil blocks; the drying powder can be dry soil powder; and the speed of the second motor in the drying mechanism is set to 55r / min; In step 4), the spraying mechanism sprays the repair liquid, the first spraying time is 25s, the amount of agent added is set to 5.5% of the mass of the contaminated soil to be treated according to the soil pollution situation, the soil moisture content is controlled at 9%, and is measured by a soil moisture meter installed on the side wall of the box; the fourth motor stirs at a speed of 30r / min for 6.5 minutes; spray again for 30s and then the fourth motor stirs at a speed of 45r / min for 10 minutes, and the spraying speed is set according to the amount of agent added; then discharge from the box; after discharge, select an area to stand for 1 day before processing, including soil backfilling.

9. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that The spraying time of the two times in step 4) is prolonged; the first spraying time is 30s, the amount of agent added is set to 4.5% of the mass of the contaminated soil to be treated according to the soil pollution situation, and the soil moisture content is controlled at 10%, measured by a soil moisture meter, and the soil moisture meter is installed on the side wall of the box; the fourth motor stirs at a speed of 25r / min for 7.5 minutes; The mixture was sprayed again for 40 seconds and then stirred at a speed of 35 r / min for 14 minutes by the fourth motor.

10. The ex situ mixing remediation device for agricultural heavy metal contaminated soil according to claim 1 is characterized in that The specific working steps of the repair device are as follows: the soil is first confirmed to be dry or sticky according to the humidity, and then it is transported into the box through an external conveying mechanism; it is first crushed by the crushing mechanism, and after crushing, the drying mechanism provides dry powder to cover and entrain the sticky soil to absorb moisture; the dry soil directly enters the supporting mechanism; then wait for the mixing mechanism to complete the mixing, and after the mixing mechanism completes and discharges the soil, the supporting mechanism releases the supported soil to enter the mixing mechanism for mixing, and then the feeding and crushing process of the box is resumed; when the mixing mechanism is mixing, the spraying mechanism sprays the repair solution, and the spraying mechanism can also adjust the spraying angle to make its spray coverage uniform. The mixing mechanism realizes the small and large range of soil replacement and stirring and mixing in sequence through the stirring mechanism and the swinging mechanism, and finally the third electric push rod pushes the third sealing plate to open the discharge port between the arc block and the partition block for discharge. During discharge, the mixing mechanism continues to stir to make the soil move in real time for easy discharge.

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