Pretreatment equipment and process for detecting heavy metals in soil

Abstract

The invention discloses pretreatment equipment and technology for detecting heavy metal in soil, and relates to the field of soil heavy metal detection.The pretreatment equipment comprises an equipment body, a conveying belt is arranged on the right side of the equipment body, a first pretreatment assembly is installed at the top of an inner cavity of the equipment body, and a screening plate is movably connected into an inner cavity of the first pretreatment assembly; a piston rod is installed on the left side of the screening plate, a second pretreatment assembly is movably connected to the bottom of the first pretreatment assembly, a protruding block is movably connected to the top of the second pretreatment assembly, movable blocks are symmetrically installed at the two ends of the two sides of the second pretreatment assembly, second springs are installed at the bottoms of the movable blocks, and a treatment box is inserted into the bottom of the inner cavity of the equipment body. According to the pretreatment equipment and process for detecting the heavy metals in the soil, the equipment can be used for carrying out pretreatment on the soil for multiple times, and the precision of a detection result can be improved during subsequent heavy metal detection.

Description

Technical Field

[0001] The present invention relates to the field of heavy metal detection in soil, and particularly to a pretreatment device and process for heavy metal detection in soil. Background Art

[0002] Soil heavy metal pollution is caused by the fact that heavy metals cannot be decomposed by soil microorganisms, and are prone to accumulation and conversion into more toxic methyl compounds, seriously endangering human health. There are mainly two ways to control soil heavy metal pollution. One is to change the existing form of heavy metals in the soil to make them fixed and reduce their mobility and bioavailability in the environment; the other is to remove heavy metals from the soil.

[0003] When detecting heavy metals in soil, it is necessary to manually remove large-volume impurities in the soil, resulting in low efficiency. At the same time, manual operation will also be contaminated to a certain extent and is relatively dangerous, which will affect the overall cost, efficiency and accuracy of heavy metal detection work.

[0004] Therefore, it is necessary to propose a pretreatment device and process for heavy metal detection in soil to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a pretreatment device and process for heavy metal detection in soil, which can effectively solve the problems in the background art.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A pretreatment device for heavy metal detection in soil includes a device body. A conveyor belt is arranged on the right side of the device body. A first pretreatment component is installed at the top of the inner cavity of the device body. A screening plate is movably connected in the inner cavity of the first pretreatment component. A piston rod is installed on the left side of the screening plate.

[0008] The bottom of the first pretreatment component is movably connected to a second pretreatment component. A convex block is movably connected to the top of the second pretreatment component. Two ends on both sides of the second pretreatment component are symmetrically installed with movable blocks. A second spring is installed at the bottom of the movable block.

[0009] A treatment box is inserted into the bottom of the inner cavity of the device body. A stirring roller is rotatably connected to the center of the inner cavity of the treatment box. Crushing rollers are symmetrically and movably connected to both sides of the stirring roller.

[0010] Preferably, a fixing frame is installed on the right side of the equipment body. A conveyor belt is installed at the bottom of the inner cavity of the fixing frame. A limiting pile is installed on the right side of the top of the inner cavity of the fixing frame. A magnetic roller is installed on the left side of the top of the inner cavity of the fixing frame. The left side of the conveyor belt extends to the top of the inner cavity of the equipment body, and the left side of the conveyor belt is located exactly in the middle of the top of the screening plate.

[0011] Preferably, a rotating motor is installed at the top of the left side of the equipment body. The bottom of the rotating motor is installed with a rotating shaft through a coupling. A connecting shaft is installed on the outer wall of the rotating shaft. The left side of the piston rod is rotatably connected to the right side of the connecting shaft. The piston rod is movably connected in the inner cavities of the equipment body and the first pretreatment component.

[0012] Preferably, a first screen is installed at the bottom of the inner cavity of the screening plate. Activity grooves are symmetrically formed on both sides of the inner cavity of the first pretreatment component. Guide rods are installed in the inner cavities of the activity grooves. Extension columns are symmetrically installed on both sides of both ends of the screening plate. The extension columns extend to the bottom of the first pretreatment component, and the bottoms of the extension columns are attached to the top of the second pretreatment component.

[0013] Preferably, a limiting block is installed at the bottom of the convex block. A first spring is installed at the bottom of the limiting block. The first spring is installed at the bottom of the inner cavity of the second pretreatment component. The limiting block is movably connected in the inner cavity of the second pretreatment component. The convex block is arc-shaped, and the side of the convex block is attached to the side of the extension column.

[0014] Preferably, fixing rods are installed on both sides of the inner cavity of the equipment body. The movable block is movably connected to the side of the inner cavity of the equipment body and sleeved on the outer wall of the fixing rod. The bottom of the second spring is installed on the side of the inner cavity of the equipment body. A second screen is installed at the bottom of the inner cavity of the second pretreatment component.

[0015] Preferably, a sealing plate is installed on the outer wall of the treatment box. The sealing plate is installed on the outer wall of the equipment body. The crushing roller is used for crushing soil, and the stirring roller is used for stirring soil and heavy metal detection materials.

[0016] Preferably, a belt is installed at one end of the treatment box. Belt pulleys are symmetrically installed at both ends of the inner cavity of the belt. The two belt pulleys are respectively connected to the two crushing rollers. A servo motor is installed on the outer wall of the treatment box. The servo motor is connected to one of the belt pulleys through a rotating shaft.

[0017] Preferably, gears are installed on both sides of the inner cavity of the treatment box. The two gears mesh with each other. One gear is connected to the right crushing roller, and the other gear is connected to the stirring roller.

[0018] A pretreatment process for detecting heavy metals in soil includes the following operating steps:

[0019] S1: Pull out the processing box, place the materials for heavy metal detection in the inner cavity of the processing box, place the soil to be detected at the conveyor belt, start the conveyor belt, and convey the soil into the inner cavity of the equipment body. When the soil is being conveyed, the limit piles will block large-volume stones and soil blocks, and the staff can take away the blocked stones and soil. After the remaining soil moves to the magnetic roller, it will adsorb magnetic materials;

[0020] S2: When the soil moves into the inner cavity of the equipment body, it will fall into the inner cavity of the screening plate. The soil that meets the size will pass through the first screen and fall into the second pre-treatment component, and the soil that meets the second screen will directly fall into the inner cavity of the processing box;

[0021] S3: Start the rotating motor, drive the connecting shaft and the piston rod to rotate through the rotating shaft. At this time, the piston rod can perform piston movement. Based on this, the piston rod can drive the screening plate to move left and right. At this time, the soil can be vibrated and screened so that the soil will not accumulate at the first screen;

[0022] S4: When the screening plate moves, it will drive the extension column to move. The extension column will move in the inner cavity of the movable groove and on the outer wall of the guide rod, and will contact the bumps at the bottom of its two sides at the same time. Based on this, it will drive the second pre-treatment component to vibrate, so that the second pre-treatment component can perform secondary vibration screening on the soil through the second screen;

[0023] S5: After the extension column contacts the bump, the bump will be squeezed into the inner cavity of the second pre-treatment component and then reset by the first spring. Based on this, it will cycle up and down. After the second pre-treatment component receives the vibration, it will drive the movable block to squeeze the second spring, and the second spring will reset the movable block. Based on this, the vibration screening efficiency of the second pre-treatment component can be improved;

[0024] S6: Start the servo motor, drive the belt and the pulley, so that the two crushing rollers can rotate. After the right crushing roller rotates, it will drive the gear on the right to mesh with the gear on the left. At this time, the stirring roller can be driven to rotate. Based on this, the soil and the materials for heavy metal detection can be stirred and mixed evenly so that the detection work can be carried out normally.

[0025] Compared with the prior art, the present invention provides a pre-treatment device and process for detecting heavy metals in soil, having the following beneficial effects:

[0026] 1. The pretreatment equipment and process for detecting heavy metals in soil can prevent large-volume soil blocks and stones from entering the inner cavity of the equipment body during soil transportation through the set limit piles. Based on this, preliminary screening of the soil can be carried out, which can effectively improve the efficiency of subsequent processing and the accuracy of detection. By setting the magnetic roller, magnetic substances contained in the soil can be adsorbed, further ensuring the purity of the soil and not affecting the final detection result.

[0027] 2. The pretreatment equipment and process for detecting heavy metals in soil can drive the screening plate to move left and right through the rotating shaft, connecting shaft and piston rod by starting the set rotating motor. Based on this, a primary vibration screening of the soil at the first screen can be carried out, which can break up the soil and transport the soil that meets the size to the second pretreatment component for subsequent processing.

[0028] 3. The pretreatment equipment and process for detecting heavy metals in soil can drive the extension column to contact it when the screening plate moves through the set convex block. Based on this, the second pretreatment component can be driven to vibrate. After the second pretreatment component vibrates, it will drive the movable block to squeeze the second spring, and the second spring will reset after being squeezed, increasing the vibration amplitude of the second pretreatment component. At this time, a secondary screening of the soil can be carried out, which can further improve the efficiency and accuracy of soil detection.

[0029] 4. The pretreatment equipment and process for detecting heavy metals in soil can start the belt and pulley by starting the set servo motor, so that the two crushing rollers can rotate. After the right crushing roller rotates, it can drive the two gears to mesh, so that the stirring roller can rotate. The cooperation of the crushing roller and the stirring roller can stir and mix the soil and the detection materials, facilitating the detection of heavy metals in the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the overall structural schematic diagram of the present invention;

[0031] Figure 2 is the structural schematic diagram of the inner cavity of the equipment body of the present invention;

[0032] Figure 3 is the structural schematic diagram of the first pretreatment component of the present invention;

[0033] Figure 4 is the upward view plan of the rotating motor of the present invention;

[0034] Figure 5 is the structural schematic diagram of the second pretreatment component of the present invention;

[0035] Figure 6 is the present invention Figure 5 enlarged view of part A;

[0036] Figure 7 It is a schematic structural diagram of the processing box of the present invention.

[0037] In the figure: 1. Equipment body; 2. Fixed frame; 3. Conveyor belt; 4. Limit pile; 5. Magnetic roller; 6. Rotating motor; 7. Rotating shaft; 8. Connecting shaft; 9. Piston rod; 10. First pretreatment component; 11. Extension column; 12. Activity groove; 13. Guide rod; 14. Screening plate; 15. First screen; 16. Second pretreatment component; 17. Second screen; 18. Convex block; 19. Limit block; 20. First spring; 21. Movable block; 22. Fixed rod; 23. Second spring; 24. Sealing plate; 25. Processing box; 26. Crushing roller; 27. Stirring roller; 28. Belt; 29. Pulley; 30. Servo motor; 31. Gear. Specific embodiments

[0038] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0039] Embodiment 1:

[0040] As Figures 1-4 shown, a pretreatment device for detecting heavy metals in soil includes an equipment body 1. A conveyor belt 3 is arranged on the right side of the equipment body 1. A first pretreatment component 10 is installed at the top of the inner cavity of the equipment body 1. A screening plate 14 is movably connected in the inner cavity of the first pretreatment component 10. A piston rod 9 is installed on the left side of the screening plate 14. A fixed frame 2 is installed on the right side of the equipment body 1. A conveyor belt 3 is installed at the bottom of the inner cavity of the fixed frame 2. A limit pile 4 is installed on the right side of the top of the inner cavity of the fixed frame 2. A magnetic roller 5 is installed on the left side of the top of the inner cavity of the fixed frame 2. The left side of the conveyor belt 3 extends to the top of the inner cavity of the equipment body 1. The left side of the conveyor belt 3 is located exactly in the middle of the top of the screening plate 14. A rotating motor 6 is installed at the top of the left side of the equipment body 1. The bottom of the rotating motor 6 is installed with a rotating shaft 7 through a coupling. A connecting shaft 8 is installed on the outer wall of the rotating shaft 7. The left side of the piston rod 9 is rotatably connected to the right side of the connecting shaft 8. The piston rod 9 is movably connected in the inner cavities of the equipment body 1 and the first pretreatment component 10. A first screen 15 is installed at the bottom of the inner cavity of the screening plate 14. Activity grooves 12 are symmetrically opened on both sides of the inner cavity of the first pretreatment component 10. Guide rods 13 are installed in the inner cavities of the activity grooves 12. Extension columns 11 are symmetrically installed on both sides of the two ends of the screening plate 14. The extension columns 11 extend to the bottom of the first pretreatment component 10. The bottom of the extension columns 11 is attached to the top of the second pretreatment component 16;

[0041] Through the provided limiting piles 4, when transporting the soil, larger soil blocks and stones can be prevented from entering the inner cavity of the equipment body 1. Based on this, preliminary selection of the soil can be carried out, effectively improving the efficiency of subsequent processing and the accuracy of detection. Through the provided magnetic roller 5, magnetic substances contained in the soil can be adsorbed, further ensuring the purity of the soil and not affecting the final detection result;

[0042] By starting the provided rotating motor 6, the screening plate 14 can be driven to move left and right through the rotating shaft 7, connecting shaft 8, and piston rod 9. Based on this, a primary vibration screening operation can be carried out on the soil at the first screen 15, the soil can be broken up, and the soil that meets the size requirements can be transported to the second pretreatment component 16 for subsequent processing.

[0043] Embodiment 2:

[0044] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 shown, for a pretreatment device for detecting heavy metals in soil, the bottom of the first pretreatment component 10 is movably connected to the second pretreatment component 16. The top of the second pretreatment component 16 is movably connected to a convex block 18. At both ends on both sides of the second pretreatment component 16, movable blocks 21 are symmetrically installed. The bottom of the movable block 21 is installed with a second spring 23. The bottom of the convex block 18 is installed with a limiting block 19. The bottom of the limiting block 19 is installed with a first spring 20. The first spring 20 is installed at the bottom of the inner cavity of the second pretreatment component 16. The limiting block 19 is movably connected in the inner cavity of the second pretreatment component 16. The convex block 18 is arc-shaped. The side of the convex block 18 is attached to the side of the extension column 11. Fixed rods 22 are installed on both sides of the inner cavity of the equipment body 1. The movable block 21 is movably connected to the side of the inner cavity of the equipment body 1 and sleeved on the outer wall of the fixed rod 22. The bottom of the second spring 23 is installed on the side of the inner cavity of the equipment body 1. A second screen 17 is installed at the bottom of the inner cavity of the second pretreatment component 16;

[0045] Through the provided convex block 18, when the screening plate 14 moves, it will drive the extension column 11 to come into contact with it. Based on this, the second pretreatment component 16 can be driven to vibrate. After the second pretreatment component 16 vibrates, it will drive the movable block 21 to squeeze the second spring 23. After being squeezed, the second spring 23 will reset, increasing the vibration amplitude of the second pretreatment component 16. At this time, a secondary screening operation can be carried out on the soil, further improving the efficiency and accuracy of soil detection.

[0046] Embodiment 3:

[0047] As Figure 1 、 Figure 7As shown in the figure, a pretreatment device for detecting heavy metals in soil. At the bottom of the inner cavity of the device body 1, a treatment box 25 is inserted. In the middle of the inner cavity of the treatment box 25, a stirring roller 27 is rotatably connected. On both sides of the stirring roller 27, crushing rollers 26 are symmetrically and movably connected. On the outer wall of the treatment box 25, a sealing plate 24 is installed. The sealing plate 24 is installed on the outer wall of the device body 1. The crushing rollers 26 are used to crush the soil, and the stirring roller 27 is used to stir the soil and the materials for heavy metal detection. At one end of the treatment box 25, a belt 28 is installed. At both ends of the inner cavity of the belt 28, belt pulleys 29 are symmetrically installed. The two belt pulleys 29 are respectively connected to the two crushing rollers 26. On the outer wall of the treatment box 25, a servo motor 30 is installed. The servo motor 30 is connected to one of the belt pulleys 29 through a rotating shaft. On both sides of the inner cavity of the treatment box 25, gears 31 are installed. The two gears 31 mesh with each other. One gear 31 is connected to the right crushing roller 26, and the other gear 31 is connected to the stirring roller 27;

[0048] By starting the set servo motor 30, the belt 28 and the belt pulleys 29 can be started, so that the two crushing rollers 26 can rotate. After the right crushing roller 26 rotates, it can drive the two gears 31 to mesh, so that the stirring roller 27 can rotate. The cooperation of the crushing rollers 26 and the stirring roller 27 can stir and mix the soil and the detection materials, facilitating the detection of heavy metals in the soil.

[0049] A pretreatment process for detecting heavy metals in soil includes the following operating steps:

[0050] S1: Pull out the treatment box 25, place the materials for heavy metal detection in the inner cavity of the treatment box 25, place the soil to be detected on the conveyor belt 3, start the conveyor belt 3, and convey the soil into the inner cavity of the device body 1. When the soil is conveyed, the limit piles 4 will block large-volume stones and soil blocks. The staff can take away the blocked stones and soil. After the remaining soil moves to the magnetic roller 5, it will adsorb magnetic materials;

[0051] S2: When the soil moves into the inner cavity of the device body 1, it will fall into the inner cavity of the screening plate 14. The soil that meets the size will pass through the first screen 15 and fall into the inner part of the second pretreatment component 16. The soil that meets the second screen 17 will directly fall into the inner cavity of the treatment box 25;

[0052] S3: Start the rotating motor 6, drive the connecting shaft 8 and the piston rod 9 to rotate through the rotating shaft 7. At this time, the piston rod 9 can perform piston movement. Based on this, the piston rod 9 can drive the screening plate 14 to move left and right. At this time, the soil can be vibrated and screened so that the soil will not accumulate at the first screen 15;

[0053] S4: When the screening plate 14 moves, it will drive the extension column 11 to move. The extension column 11 will move within the inner cavity of the movable slot 12 and along the outer wall of the guide rod 13, and at the same time, it will come into contact with the bumps 18 at the bottom on both sides thereof. Based on this, the second pretreatment component 16 will be driven to vibrate, so that the second pretreatment component 16 can perform secondary vibration screening on the soil through the second sieve 17;

[0054] S5: After the extension column 11 contacts the bump 18, the bump 18 will be squeezed into the inner cavity of the second pretreatment component 16 and then reset by the first spring 20. Based on this, it moves up and down in a cycle. After receiving the vibration, the second pretreatment component 16 will drive the movable block 21 to squeeze the second spring 23, and the second spring 23 will reset the movable block 21. Based on this, the vibration screening efficiency of the second pretreatment component 16 is improved;

[0055] S6: Start the servo motor 30 to drive the belt 28 and the belt pulley 29, so that the two crushing rollers 26 can rotate. After the right crushing roller 26 rotates, it will drive the right gear 31 to mesh with the left gear 31. At this time, the stirring roller 27 can be driven to rotate. Based on this, the soil and the materials for heavy metal detection can be stirred and mixed evenly, so that the detection work can be carried out normally.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A pretreatment device for detecting heavy metals in soil, comprising a device body (1), characterized in that: A conveyor belt (3) is arranged on the right side of the equipment body (1). At the top of the inner cavity of the equipment body (1), a first pre-treatment component (10) is installed. A screening plate (14) is movably connected in the inner cavity of the first pre-treatment component (10). A piston rod (9) is installed on the left side of the screening plate (14). The bottom of the first pre-treatment component (10) is movably connected to a second pre-treatment component (16). A bump (18) is movably connected to the top of the second pre-treatment component (16). At both ends on both sides of the second pre-treatment component (16), movable blocks (21) are symmetrically installed. A second spring (23) is installed at the bottom of the movable block (21). A treatment box (25) is inserted into the bottom of the inner cavity of the equipment body (1). A stirring roller (27) is rotatably connected to the center of the inner cavity of the treatment box (25). Crushing rollers (26) are symmetrically and movably connected to both sides of the stirring roller (27).

2. The pretreatment device for detecting heavy metals in soil according to claim 1, characterized in that: A fixing frame (2) is installed on the right side of the equipment body (1). A conveyor belt (3) is installed at the bottom of the inner cavity of the fixing frame (2). A limiting pile (4) is installed on the right side of the top of the inner cavity of the fixing frame (2). A magnetic roller (5) is installed on the left side of the top of the inner cavity of the fixing frame (2). The left side of the conveyor belt (3) extends to the top of the inner cavity of the equipment body (1), and the left side of the conveyor belt (3) is located at the center of the top of the screening plate (14).

3. The pretreatment device for detecting heavy metals in soil according to claim 1, characterized in that: A rotating motor (6) is installed at the top of the left side of the equipment body (1). A rotating shaft (7) is installed at the bottom of the rotating motor (6) through a coupling. A connecting shaft (8) is installed on the outer wall of the rotating shaft (7). The left side of the piston rod (9) is rotatably connected to the right side of the connecting shaft (8). The piston rod (9) is movably connected in the inner cavities of the equipment body (1) and the first pre-treatment component (10).

4. The pretreatment device for detecting heavy metals in soil according to claim 1, characterized in that: A first screen (15) is installed at the bottom of the inner cavity of the screening plate (14). Movable grooves (12) are symmetrically opened on both sides of the inner cavity of the first pre-treatment component (10). Guide rods (13) are installed in the inner cavities of the movable grooves (12). Extension columns (11) are symmetrically installed on both sides of both ends of the screening plate (14). The extension columns (11) extend to the bottom of the first pre-treatment component (10), and the bottom of the extension columns (11) is attached to the top of the second pre-treatment component (16).

5. The pretreatment device for detecting heavy metals in soil according to claim 1, characterized in that: A limiting block (19) is installed at the bottom of the bump (18). A first spring (20) is installed at the bottom of the limiting block (19). The first spring (20) is installed at the bottom of the inner cavity of the second pre-treatment component (16). The limiting block (19) is movably connected in the inner cavity of the second pre-treatment component (16). The bump (18) is arc-shaped, and the side of the bump (18) is attached to the side of the extension column (11).

6. The pretreatment device for detecting heavy metals in soil according to claim 1, wherein: On both sides of the inner cavity of the device body (1), there are fixed rods (22) installed. The movable block (21) is movably connected to the side of the inner cavity of the device body (1) and sleeved on the outer wall of the fixed rod (22). The bottom of the second spring (23) is installed on the side of the inner cavity of the device body (1). At the bottom of the inner cavity of the second pre-treatment component (16), there is a second sieve (17) installed.

7. The pretreatment equipment for detecting heavy metals in soil according to claim 1, characterized in that: On the outer wall of the treatment box (25), there is a sealing plate (24) installed. The sealing plate (24) is installed on the outer wall of the device body (1). The crushing roller (26) is used for crushing soil, and the stirring roller (27) is used for stirring soil and materials for heavy metal detection.

8. The pretreatment device for detecting heavy metals in soil according to claim 1, wherein: At one end of the treatment box (25), there is a belt (28) installed. At both ends of the inner cavity of the belt (28), there are belt pulleys (29) symmetrically installed. The two belt pulleys (29) are respectively connected to the two crushing rollers (26). On the outer wall of the treatment box (25), there is a servo motor (30) installed. The servo motor (30) is connected to one of the belt pulleys (29) through a rotating shaft.

9. The pretreatment device for detecting heavy metals in soil according to claim 1, wherein: On both sides of the inner cavity of the treatment box (25), there are gears (31) installed. The two gears (31) mesh with each other. One of the gears (31) is connected to the right crushing roller (26), and the other gear (31) is connected to the stirring roller (27).

10. A pretreatment process for detecting heavy metals in soil, using a pretreatment device for detecting heavy metals in soil as described in any one of the above claims 1-9, characterized in that: It includes the following operation steps: S1: Pull out the treatment box (25), place the materials for heavy metal detection in the inner cavity of the treatment box (25), place the soil to be detected at the conveyor belt (3), start the conveyor belt (3), and convey the soil into the inner cavity of the device body (1). When the soil is being conveyed, the limit piles (4) will block large-volume stones and soil blocks. The staff can take away the blocked stones and soil. After the remaining soil moves to the magnetic roller (5), it will adsorb magnetic materials. S2: When the soil moves into the inner cavity of the device body (1), it will fall into the inner cavity of the screening plate (14). The soil that meets the size will pass through the first sieve (15) and fall into the second pre-treatment component (16). The soil that meets the second sieve (17) will directly fall into the inner cavity of the treatment box (25). S3: Start the rotating motor (6), drive the connecting shaft (8) and the piston rod (9) to rotate through the rotating shaft (7). At this time, the piston rod (9) can perform piston motion. Based on this, the piston rod (9) can drive the screening plate (14) to move left and right. At this time, the soil can be vibrated and screened, so that the soil will not accumulate at the first sieve (15). When the screening plate (14) moves, it will drive the extension column (11) to move. The extension column (11) will move in the inner cavity of the movable slot (12) and on the outer wall of the guide rod (13), and at the same time will contact the convex blocks (18) at the bottom of its two sides. Based on this, it will drive the second pre-treatment component (16) to vibrate, so that the second pre-treatment component (16) can perform secondary vibration screening on the soil through the second sieve (17). S5: After the extension column (11) contacts the convex block (18), the convex block (18) will be squeezed into the inner cavity of the second pre-treatment component (16), and then reset by the first spring (20). Based on this, it moves up and down in a cycle. After the second pre-treatment component (16) receives vibration, it will drive the movable block (21) to squeeze the second spring (23), and the second spring (23) will reset the movable block (21). Based on this, the vibration screening efficiency of the second pre-treatment component (16) is improved; S6: Start the servo motor (30) to drive the belt (28) and the pulley (29), so that the two crushing rollers (26) can rotate. After the right crushing roller (26) rotates, it will drive the right gear (31) to mesh with the left gear (31). At this time, the stirring roller (27) can be driven to rotate. Based on this, the soil and the materials for heavy metal detection can be stirred and mixed evenly, so that the detection work can be carried out normally.

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