Collecting device for volatile mercury in polluted soil

Abstract

The invention relates to the technical field of soil pollution monitoring, and particularly discloses a device for collecting volatile mercury in polluted soil, which comprises a mounting cylinder, a plurality of groups of turbine fan blades rotationally connected to the mounting cylinder, and a top plate, and the plurality of groups of turbine fan blades are rotationally connected with the top plate; a connecting shaft is mounted on the top plate, and a sampling mechanism for sampling operation is arranged at the bottom of the connecting shaft; the sampling mechanism comprises a connecting cylinder mounted on the mounting cylinder, a base is arranged at the bottom of the connecting cylinder, a connecting plate is slidably connected to the connecting cylinder, and a collecting unit is arranged between the connecting plate and the base; a plurality of groups of air inlet holes are formed in the base, and a plugging mechanism is arranged between the connecting plate and the base. And after the sampling operation is completed, the gas inlet hole is blocked by the blocking mechanism, so that the gas volatilization after the sampling is completed is avoided, the practicability of the sampling device can be further improved, and the working requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of soil pollution monitoring, and in particular to a device for collecting volatile mercury in contaminated soil. Background Art

[0002] Mercury is a heavy metal element with high toxicity, persistence and bioaccumulation. It can be converted into highly toxic methylmercury in nature, and enriched and amplified through the food chain, posing a serious threat to human health. Mercury pollution mainly comes from industrial activities, such as chlor-alkali production, cable equipment and switch manufacturing, measurement and control equipment production, lead and zinc smelting, gold mining, lighting systems and dental work.

[0003] The environmental behavior characteristics of volatile heavy metal mercury (Hg) in soil are mainly reflected in its migration, transformation and volatilization processes in soil. Mercury can exist in different forms in soil, including metallic mercury, inorganic mercury and organic mercury. The volatility of mercury is closely related to factors such as the form of its compounds, solubility, surface adsorption and relative humidity of the atmosphere. The volatility of organic mercury is usually greater than that of inorganic mercury, especially methyl mercury, which has the highest volatility. The environmental behavior of mercury also includes its transfer cycle between soil and plants. Mercury can be released into the atmosphere through the transpiration of soil and plants, and mercury in the gas phase can also be transferred to the liquid phase and solid phase. For example, after mercury enters the water body, it can be dissolved in water or enriched in organisms through physical, chemical, biological and other effects, or sink into the bottom mud, or volatilize into the atmosphere.

[0004] The hazards of mercury are mainly reflected in its negative impact on ecosystems and human health. Mercury and its compounds are neurotoxic, and even low-concentration exposure may cause damage to the nervous system. Long-term exposure to mercury-containing environments may cause chronic poisoning, manifested by symptoms such as headaches, dizziness, numbness and pain in the limbs, and muscle tremors. In extreme cases, large amounts of inhalation of mercury vapor may lead to acute mercury poisoning, with symptoms including hepatitis, nephritis, proteinuria, hematuria, and uremia. In addition, the bioaccumulation of mercury in the environment may lead to a significant increase in mercury concentrations in aquatic organisms, which in turn poses a threat to human health through the food chain.

[0005] In the soil around the mercury mining area, the content of heavy metal mercury and the ecological risk are particularly significant. Studies have shown that mercury mining activities have a significant impact on the surrounding soil environment and human health. The surface enrichment of heavy metal mercury in the soil is obvious, and there are varying degrees of exceeding the standard. Mercury in the soil is mainly affected by mining activities. It has little impact on the health of adults, but it is more likely to cause health risks to children. Mercury mining is the main cause of soil pollution and ecological risks in the study area.

[0006] In the prior art, there is a Chinese patent with application number 202021517487.8, authorization announcement number CN212674555U, and name of a volatile organic pollutant collection device in soil. The above patent discloses a volatile organic pollutant collection device in soil, including a sliding rod, a handle is provided on the lower side of the sliding rod, a hollow extension rod is provided on the lower side of the handle, a gas collecting rod is provided at the lower end of the hollow extension rod, a drill bit is provided at the lower end of the gas collecting rod, a sliding hammer is provided on the sliding rod, a pagoda head is provided at the top of the sliding rod, and external threads are provided at the bottom end of the sliding rod and the two ends of the hollow extension rod. The drill bit in the above patent has been quenched, has a high density, is hard to place and is not easy to deform. The sliding hammer has high stability after connection, is easy to operate, and has a sliding rod to fix its position. It has a good use effect in places with compacted soil and gravel soil, reducing the situation of offset and accidental injury to operators due to unstable center of gravity.

[0007] However, at present, the treatment technologies for soil mercury pollution mainly include thermal desorption, solidification and stabilization, chemical extraction, and phytoremediation. These technologies have their own advantages and disadvantages, such as the high energy consumption, high cost, and the treatment effect is affected by many factors. For example, although the thermal desorption technology has a high mercury removal rate, it has high energy consumption and affects the organic matter and water in the soil; although the chemical extraction technology can thoroughly treat soil heavy metal pollution, the selection of the extractant and the extraction conditions have a significant impact on the treatment effect, and may cause secondary pollution, which has certain shortcomings. At the same time, after the sampling is completed in the existing technology, the sampled gas cannot be quickly stored, which has certain shortcomings. Summary of the invention

[0008] The purpose of the present invention is to provide a device for collecting volatile mercury in contaminated soil to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for collecting volatile mercury in contaminated soil, comprising a mounting tube, a plurality of groups of turbine blades rotatably connected to the mounting tube, and a top plate, wherein the plurality of groups of turbine blades are rotatably connected to the top plate; a connecting shaft is mounted on the top plate, and a sampling mechanism for sampling operation is arranged at the bottom of the connecting shaft; the sampling mechanism comprises a connecting tube mounted on the mounting tube, a base is arranged at the bottom of the connecting tube, and a connecting plate is slidably connected to the connecting tube, and a collecting unit is arranged between the connecting plate and the base; and a plurality of groups of air inlet holes are arranged on the base, and a sealing mechanism is arranged between the connecting plate and the base.

[0010] Furthermore, the blocking mechanism includes multiple groups of blocking strips slidably connected inside the base, the multiple groups of blocking strips are connected by a connecting unit, a power piece for sliding the multiple groups of blocking strips is arranged on the connecting plate, and a clamping mechanism is arranged between the connecting unit and the power piece for locking the power piece.

[0011] Furthermore, a limiting portion is provided between the connecting plate and the connecting tube; the limiting portion comprises a positioning block fixedly connected to the connecting plate, a limiting groove matched with the positioning block is provided on the connecting tube, and the positioning block is vertically slidably connected in the positioning groove.

[0012] Furthermore, the power member includes a pressure rod fixedly connected to one of the positioning blocks, and the pressure rod is slidably connected to the limiting groove.

[0013] Furthermore, the connecting unit includes a connecting rod fixedly connected to multiple groups of sealing strips, a power rod fixedly connected to the connecting rod, and a positioning spring is also arranged between the connecting rod and the base, the elastic force of the positioning spring drives the sealing strip and the air inlet hole to be staggered; and a wedge-shaped groove is opened on the power rod, and the pressure rod abuts and cooperates with the wedge-shaped groove.

[0014] Furthermore, the clamping mechanism includes a sliding plate slidably connected to the power rod, a clamping block is fixedly connected to the sliding plate, a positioning groove adapted to the clamping block is provided on the pressure rod, and the sliding plate is slidably connected to the power rod through an elastic member, and the elastic force of the elastic member drives the clamping block to be clamped in the positioning groove to fix the pressure rod.

[0015] Furthermore, the elastic member includes a connecting spring, a trapezoidal mounting block is fixedly connected to the connecting plate sliding plate, the trapezoidal mounting block is slidably connected in the trapezoidal groove, and a connecting spring is arranged between the trapezoidal mounting block and the trapezoidal groove.

[0016] Furthermore, a plurality of groups of limit bars are fixedly connected to the power rod, a plurality of groups of strip grooves matching the limit bars are formed on the sliding plate, and the limit bars are slidably connected to the strip grooves.

[0017] Furthermore, a boss is provided on the connecting plate, the connecting shaft is clamped with the boss, and a locking rod is installed inside the connecting shaft, and the locking rod is intermittently connected to the boss.

[0018] Furthermore, a first fastening thread section is provided on the bottom of the locking rod, a second fastening thread section is provided inside the boss, and the first fastening thread section is threadedly connected to the second fastening thread section; a second locking thread section is provided on the top of the fastening rod, a first locking thread section is provided on the connecting shaft, and the first locking thread section is threadedly connected to the second locking thread section.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the design and combination of the device for collecting volatile mercury in contaminated soil cleverly apply the principle of air convection in nature, and utilize air flow in any parallel direction to generate vertical negative pressure in the air guide channel and the collection unit, so that the volatile mercury in the soil is extracted and adsorbed on the diffusion layer and the binding layer. The device can be placed in the field for sample collection around the clock. The device uses the average daily collection amount of volatile mercury as the data expression form, and compares the pollution level of volatile mercury in the soil based on the average daily collection amount data. After the sampling operation is completed, the air inlet is blocked by a blocking mechanism to prevent the gas from volatilizing after the sampling is completed, thereby further improving the practicality of the sampling device and meeting the work needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the overall structure from another perspective provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the overall internal structure provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of the locking rod and the connecting shaft in the unfolded state provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure of the locking rod and the connecting shaft in the explosion state provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the explosion state structure of the sampling mechanism provided by an embodiment of the present invention;

[0027] Figure 7 A schematic diagram of a local structure of a clamping member provided in an embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the structure of the connection between the blocking strip and the connecting rod provided in an embodiment of the present invention;

[0029] Fig. 9 A schematic diagram of a top view of the blocking mechanism provided in an embodiment of the present invention;

[0030] Fig.10 for Fig. 9 Schematic diagram of the AA section structure along the middle edge;

[0031] Fig.11 A schematic diagram of the structure of the elastic member installation method provided in an embodiment of the present invention.

[0032] Explanation of the accompanying drawings: 1. Turbine blade; 2. Top plate; 3. Connecting cylinder; 4. Connecting shaft; 5. Base; 6. Connecting plate; 7. First locking thread segment; 8. Locking rod; 9. Second locking thread segment; 10. First fastening thread segment; 11. Boss; 12. Second fastening thread segment; 13. Limiting groove; 14. Positioning block; 15. Air inlet; 16. Sealing strip; 17. Connecting rod; 18. Positioning spring; 19. Power rod; 20. Block; 21. Sliding plate; 22. Limiting strip; 23. Connecting spring; 24. Trapezoidal mounting block; 25. Pressure rod; 26. Positioning groove; 27. Mounting cylinder. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 11 The present invention provides a technical solution: a device for collecting volatile mercury in contaminated soil, comprising a mounting barrel 27, a plurality of turbine blades 1 rotatably connected to the mounting barrel 27, and a top plate 2, wherein the plurality of turbine blades 1 are rotatably connected to the top plate 2; a connecting shaft 4 is mounted on the top plate 2, and a sampling mechanism for sampling operation is arranged at the bottom of the connecting shaft 4; the sampling mechanism comprises a connecting barrel 3 mounted on the mounting barrel 27, a base 5 is arranged at the bottom of the connecting barrel 3, and a connecting plate 6 is slidably connected to the connecting barrel 3, and a collecting unit is arranged between the connecting plate 6 and the base 5; and a plurality of air inlet holes 15 are arranged on the base 5, and a blocking mechanism is arranged between the connecting plate 6 and the base 5.

[0035] Specifically, the device for collecting volatile mercury in contaminated soil includes a mounting tube 27, multiple groups of turbine blades 1 rotatably connected to the mounting tube 27, and a top plate 2, wherein the multiple groups of turbine blades 1 are rotatably connected to the top plate 2. The cooperation between the multiple groups of turbine blades 1 and the mounting tube 27 forms an unpowered turbine. The power turbine drives the turbine to rotate through the natural wind speed, accelerates the air flow in the parallel direction, and transforms it into a vertical air flow from bottom to top, thereby achieving the effect of ventilation. More specifically, the unpowered turbine utilizes the principle of natural air convection to accelerate and transform any parallel air flow into a vertical air flow from bottom to top. That is, when the turbine blade 1 rotates, negative pressure will be generated inside the turbine blade 1, and the gas inside the turbine blade 1 will be extracted. A connecting shaft 4 is installed on the top plate 2, and a sampling mechanism for sampling operation is provided at the bottom of the connecting shaft 4. The sampling mechanism includes a connecting tube 3 installed on the mounting tube 27, a base 5 is provided on the bottom of the connecting tube 3, and a connecting plate 6 is slidably connected to the connecting tube 3, and a collection unit is provided between the connecting plate 6 and the base 5. Specifically, the collection unit includes a diffusion layer and a bonding layer, and a barrier filter membrane is provided inside the mounting tube 27, wherein the barrier filter membrane can use a glass fiber filter membrane, and can also use a filter membrane of other materials according to different monitoring needs, such as a quartz fiber filter membrane. The diffusion layer and the bonding layer are placed on the barrier filter membrane, including an outer frame and a screen, and the outer frame is an elliptical flange made of high-density polyethylene material, which minimizes the adsorption of mercury. The outer diameter of the flange is 120mm, the inner diameter is 100mm, and the total thickness is 100mm; the flange is composed of two layers, which are connected and fixed with screws; the bottom and middle of the flange are both screens, and the screen material is high-density polyethylene; the screens are 300 meshes and the aperture is 48μm. The functions of the bottom and middle screens are: to pass volatile mercury vapor, carry and separate the adsorbents of the diffusion layer and the bonding layer. Specifically, the mercury adsorbed in the adsorbents of the diffusion layer and the bonding layer is determined by atomic absorption spectrometry. The specific analysis method is based on the principle of catalytic pyrolysis-gold amalgamation-atomic absorption spectrometry in the United States EPA-7473 "Analysis of Mercury in Solid and Liquid Samples", that is, the detection limit is 0.0004ng. Preferably, the design and combination of the various parts of the device cleverly apply the principle of natural air convection, and use air flow in any parallel direction to generate vertical negative pressure in the air guide channel and the collection unit, so that the volatile mercury in the soil is extracted and adsorbed on the diffusion layer and the binding layer. It can be placed in the field for sample collection all day long. The device uses the average daily collection amount of volatile mercury as the data expression form, and compares the pollution level of volatile mercury in the soil according to the average daily collection amount data. There are multiple groups of air inlet holes 15 on the base 5, and a blocking mechanism is provided between the connecting plate 6 and the base 5. By providing the blocking mechanism, after the sampling operation is completed, the air inlet hole 15 is blocked by the blocking mechanism to avoid gas volatilization after the sampling is completed, thereby further improving the practicality of the sampling device and meeting work needs.

[0036] In the embodiment provided by the present invention, the blocking mechanism includes a plurality of blocking strips 16 slidably connected to the inside of the base 5, the plurality of blocking strips 16 are connected by a connecting unit, a power piece for sliding the plurality of blocking strips 16 is provided on the connecting plate 6, and a clamping mechanism is provided between the connecting unit and the power piece for locking the power piece. Therefore, during use, when the sampling operation is completed, the connecting plate 6 slides downward, and the connecting unit is driven by the power piece to drive the plurality of blocking strips 16 to slide, thereby blocking the air inlet 15, and then the power piece is locked and fixed by the clamping mechanism, thereby sealing the sampled gas.

[0037] In the embodiment provided by the present invention, a limiting portion is arranged between the connecting plate 6 and the connecting tube 3; the limiting portion includes a positioning block 14 fixedly connected to the connecting plate 6, and a limiting groove 13 adapted to the positioning block 14 is opened on the connecting tube 3, and the positioning block 14 is vertically slidably connected in the positioning groove 26, which can further improve the stability of the connecting plate 6 when sliding.

[0038] In the embodiment provided by the present invention, the power member includes a pressure rod 25 fixedly connected to one of the positioning blocks 14, the pressure rod 25 is slidably connected to the limit groove 13, the connection unit includes a connecting rod 17 fixedly connected to multiple groups of blocking strips 16, a power rod 19 is fixedly connected to the connecting rod 17, and a positioning spring 18 is also provided between the connecting rod 17 and the base 5, the elastic force of the positioning spring 18 drives the blocking strip 16 and the air inlet 15 to be in a staggered state; and a wedge-shaped groove is provided on the power rod 19, and the pressure rod 25 abuts against the wedge-shaped groove. When the pressure rod 25 slides downward, the multiple groups of blocking strips 16 are driven to slide through the power rod 19 to meet the working needs.

[0039] In the embodiment provided by the present invention, the clamping mechanism includes a sliding plate 21 slidably connected to the power rod 19, a clamping block 20 is fixedly connected to the sliding plate 21, a positioning groove 26 adapted to the clamping block 20 is provided on the pressure rod 25, and the sliding plate 21 is slidably connected to the power rod 19 through an elastic member, and the elastic force of the elastic member drives the clamping block 20 to clamp in the positioning groove 26 to fix the pressure rod 25, thereby being able to further meet work needs.

[0040] In the embodiment provided by the present invention, the elastic member includes a connecting spring 23, a trapezoidal mounting block 24 is fixedly connected to the connecting plate 6 and the sliding plate 21, the trapezoidal mounting block 24 is slidably connected in the trapezoidal groove, and a connecting spring 23 is arranged between the trapezoidal mounting block 24 and the trapezoidal groove.

[0041] In the embodiment provided by the present invention, a plurality of limit strips 22 are fixedly connected to the power rod 19, a plurality of strip grooves matching the limit strips 22 are provided on the sliding plate 21, and the limit strips 22 are slidably connected to the strip grooves, thereby further improving the stability of the sliding plate 21 when sliding.

[0042] In the embodiment provided by the present invention, a boss 11 is provided on the connecting plate 6, the connecting shaft 4 is clamped with the boss 11, and a locking rod 8 is installed inside the connecting shaft 4, and the locking rod 8 is intermittently connected to the boss 11, thereby facilitating the installation and disassembly of the connecting shaft 4 and the entire sampling mechanism.

[0043] In the embodiment provided by the present invention, a first fastening thread segment 10 is provided on the bottom of the locking rod 8, a second fastening thread segment 12 is provided inside the boss 11, and the first fastening thread segment 10 is threadedly connected to the second fastening thread segment 12; a second locking thread segment 9 is provided on the top of the fastening rod, a first locking thread segment 7 is provided on the connecting shaft 4, and the first locking thread segment 7 is threadedly connected to the second locking thread segment 9. When it is necessary to disassemble the connecting shaft 4 from the connecting plate 6, the locking rod 8 is rotated to make the locking rod 8 slide vertically, so that the locking rod 8 slides out from the boss 11, and at this moment, the connecting shaft 4 can be separated from the connecting plate 6 to meet the working needs.

[0044] It should be noted that the electrical equipment involved in this application can be powered by batteries or external power supply.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for collecting volatile mercury in contaminated soil, comprising a mounting barrel (27), and a plurality of turbine blades (1) rotatably connected to the mounting barrel (27), characterized in that: It also includes a top plate (2), and a plurality of groups of turbine blades (1) are rotatably connected to the top plate (2); A connecting shaft (4) is installed on the top plate (2), and a sampling mechanism for sampling operations is arranged at the bottom of the connecting shaft (4); The sampling mechanism comprises a connecting tube (3) mounted on a mounting tube (27), a base (5) being arranged on the bottom of the connecting tube (3), and a connecting plate (6) being slidably connected to the connecting tube (3), and a collecting unit being arranged between the connecting plate (6) and the base (5); Furthermore, a plurality of groups of air inlet holes (15) are provided on the base (5), and a blocking mechanism is provided between the connecting plate (6) and the base (5).

2. The device for collecting volatile mercury in contaminated soil according to claim 1, characterized in that: The blocking mechanism comprises a plurality of groups of blocking strips (16) slidably connected inside the base (5), the plurality of groups of blocking strips (16) being connected via a connecting unit, a power piece on which the plurality of groups of blocking strips (16) slide is arranged on the connecting plate (6), and a clamping mechanism is arranged between the connecting unit and the power piece for locking the power piece.

3. The device for collecting volatile mercury in contaminated soil according to claim 2, characterized in that: A limiting portion is provided between the connecting plate (6) and the connecting tube (3); the limiting portion comprises a positioning block (14) fixedly connected to the connecting plate (6); a limiting groove (13) adapted to the positioning block (14) is provided on the connecting tube (3); and the positioning block (14) is vertically slidably connected in the positioning groove (26).

4. The device for collecting volatile mercury in contaminated soil according to claim 3, characterized in that: The power member comprises a pressure rod (25) fixedly connected to one of the positioning blocks (14), and the pressure rod (25) is slidably connected to the limiting groove (13).

5. The device for collecting volatile mercury in contaminated soil according to claim 4, characterized in that: The connection unit comprises a connection rod (17) fixedly connected to a plurality of groups of sealing strips (16); a power rod (19) is fixedly connected to the connection rod (17); and a positioning spring (18) is provided between the connection rod (17) and the base (5); the elastic force of the positioning spring (18) drives the sealing strip (16) and the air inlet (15) to be in a staggered state; and a wedge-shaped groove is provided on the power rod (19), and the pressure rod (25) abuts against the wedge-shaped groove.

6. The device for collecting volatile mercury in contaminated soil according to claim 5, characterized in that: The clamping mechanism comprises a sliding plate (21) slidably connected to the power rod (19); a clamping block (20) is fixedly connected to the sliding plate (21); a positioning groove (26) adapted to the clamping block (20) is provided on the pressure rod (25); and the sliding plate (21) is slidably connected to the power rod (19) through an elastic member; the elastic force of the elastic member drives the clamping block (20) to be clamped in the positioning groove (26) to fix the pressure rod (25).

7. The device for collecting volatile mercury in contaminated soil according to claim 6, characterized in that: The elastic member comprises a connecting spring (23), a trapezoidal mounting block (24) is fixedly connected to the connecting plate (6) and the sliding plate (21), the trapezoidal mounting block (24) is slidably connected in the trapezoidal groove, and a connecting spring (23) is arranged between the trapezoidal mounting block (24) and the trapezoidal groove.

8. The device for collecting volatile mercury in contaminated soil according to claim 6, characterized in that: The power rod (19) is fixedly connected with a plurality of limit strips (22), the sliding plate (21) is provided with a plurality of strip grooves matched with the limit strips (22), and the limit strips (22) are slidably connected with the strip grooves.

9. The device for collecting volatile mercury in contaminated soil according to claim 1, characterized in that: The connecting plate (6) is provided with a boss (11), the connecting shaft (4) is engaged with the boss (11), and a locking rod (8) is installed inside the connecting shaft (4), and the locking rod (8) is intermittently connected to the boss (11).

10. The device for collecting volatile mercury in contaminated soil according to claim 9, characterized in that: A first fastening thread section (10) is provided on the bottom of the locking rod (8), a second fastening thread section (12) is provided inside the boss (11), and the first fastening thread section (10) and the second fastening thread section (12) are threadedly connected; A second locking thread section (9) is provided on the top of the fastening rod, a first locking thread section (7) is provided on the connecting shaft (4), and the first locking thread section (7) is threadedly connected to the second locking thread section (9).

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