A heavy metal soil pollution treatment method and a soil sample collection device for soil pollution treatment

Abstract

The application discloses a heavy metal soil pollution treatment method and a soil sample collection device for soil pollution treatment, and belongs to the technical field of soil pollution treatment. The heavy metal soil pollution treatment method comprises the following steps: in-situ soil sampling of multiple sampling points in a region to be treated at a predetermined depth by using the soil sample collection device for heavy metal soil pollution treatment; detecting and analyzing the in-situ soil sample, so as to obtain the pollution spatial distribution, the main control heavy metal type and the soil property in the region to be treated; and selecting a corresponding treatment scheme according to the pollution spatial distribution, the main control heavy metal type and the soil property in the region to be treated, so as to repair and treat the heavy metal contaminated soil in the region to be treated. The application further provides the soil sample collection device for heavy metal soil pollution treatment. The application realizes in-situ soil sample collection and heavy metal soil pollution treatment.

Description

Technical Field

[0001] This invention belongs to the field of soil pollution remediation technology, and specifically relates to a method for remediating heavy metal soil pollution and a soil sample collection device for soil pollution remediation. Background Technology

[0002] In the remediation of heavy metal-contaminated soil, it is usually necessary to collect in-situ soil samples from different depths and layers, and analyze the heavy metal content, occurrence state, and migration risk to provide a basis for the identification, risk assessment, and zoned remediation of heavy metal pollution in soil. The correspondence between soil layers and the preservation of the original state during sample collection directly affect the accuracy of subsequent testing and analysis results.

[0003] Current soil sampling methods primarily employ either auger drilling or direct-push tube sampling, but both methods have certain drawbacks. For example, soil samples obtained through auger drilling are often fragmented, failing to represent the in-situ soil and making it difficult to accurately obtain undisturbed soil samples at a predetermined depth. While direct-push tube sampling can deliver soil samples into the sampling tube, the higher soil moisture at certain depths often results in a regular cylindrical shape inside the tube, with the lower part still connected to the undisturbed soil below. This connection between the cylindrical soil sample and the lower soil can cause the soil sample inside the tube to be pulled by the continuous soil below during subsequent extraction, leading to partial or even complete detachment of the undisturbed soil sample from the tube. Once this occurs, resampling is required, increasing workload, affecting sampling efficiency, and hindering the overall progress of soil remediation.

[0004] Therefore, existing soil sampling methods are insufficient to accurately obtain undisturbed soil samples at a predetermined depth, which affects the accuracy of stratified detection and analysis of heavy metal contaminated soil, and consequently impacts the formulation of subsequent soil pollution remediation and treatment plans. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a method for remediating heavy metal soil pollution and a soil sampling device for soil pollution remediation, so as to solve one or more of the above-mentioned problems existing in the prior art.

[0006] The objective of this invention is achieved as follows: Firstly, a method for remediating heavy metal soil pollution is provided, comprising the following steps: Step S1: Use a soil sampling device for heavy metal soil pollution remediation to collect in-situ soil samples at a predetermined depth from multiple sampling points in the area to be remediated. Step S2: Analyze the extracted in-situ soil samples to obtain the spatial distribution of pollution, the main controlled heavy metals, and soil properties within the area to be treated. Step S3: Based on the spatial distribution of pollution, the main controlled heavy metals, and the soil properties in the area to be treated, select an appropriate treatment plan and carry out remediation of the heavy metal contaminated soil in the area to be treated.

[0007] Furthermore, the spatial distribution of pollution is determined by combining the coordinates of each sampling point with the corresponding pollution data using GIS technology, thus clarifying the specific ranges of high-pollution areas, medium-pollution areas, and low-pollution areas; and / or, the main controlled heavy metal species are determined by conducting atomic absorption spectrometry and inductively coupled plasma mass spectrometry tests on in-situ soil samples; and / or, the soil property data include soil pH value, organic matter content, cation exchange capacity, and particle composition data.

[0008] Furthermore, in step S3, the governance measures adopted include: For highly polluted areas, an ex-situ leaching-solidification stabilization combined process is used to remediate and treat the soil in the highly polluted areas; For moderately polluted areas, in-situ chemical passivation technology is used to remediate and treat the soil in the moderately polluted areas; For low-pollution areas, phytoremediation is the primary method, supplemented by microbial enhancement technology, to remediate and treat the soil in these areas.

[0009] Further, in step S1, in-situ soil sampling is performed at a predetermined depth, including: Determine the sampling points, target sampling layers, and corresponding target sampling depths, and pre-drill holes at each sampling point, wherein the depth of the pre-drill holes is not greater than the target sampling depth; Install the sampling tube at the bottom of the connecting rod and separate the bottom cover from the bottom of the sampling tube so that the bottom of the sampling tube remains open; then, set up the tripod above the corresponding sampling point so that the sampling tube corresponds to the pre-drilled hole; The connecting bracket and connecting rod are driven downward by a linear drive, so that the sampling tube is inserted downward along the pre-drilled hole and continues to enter the target sampling layer. During the insertion of the sampling tube, when the sampling tube can continue to descend, the connecting bracket and the connecting rod are kept displaced downwards so that the sampling tube continues to be pressed into the soil layer; when the sampling tube encounters a harder soil layer or the insertion resistance increases, the impact mechanism is driven to work, so that the impact rod is displaced up and down intermittently and an intermittent impact force is applied to the sampling tube so that the sampling tube continues to be inserted into the target sampling layer. After the sampling tube is inserted into the target sampling layer, the target soil layer enters the sampling tube and pushes the push plate up. When the push plate moves up to the predetermined position, the limiting block on the limiting shaft disengages from the straight opening, and the first elastic element drives the rotating blade to rotate to cut the connection between the target soil sample and the lower continuous soil. After cutting, use a linear drive to move the connecting bracket and connecting rod upward, so that the sampling tube and the soil sample inside are pulled out of the pre-drilled hole as a whole; After the sampling tube leaves the pre-drilled hole, the bottom cover is placed on the bottom of the sampling tube to complete the in-situ soil sampling at the predetermined depth.

[0010] Secondly, a soil sampling device for heavy metal soil pollution remediation is also provided, which can be applied to the heavy metal soil pollution remediation method provided in the first aspect; the soil sampling device includes: The tripod has a connecting bracket on its top. A connecting rod, which is connected to the connecting bracket and extends downward through the tripod to the bottom of the tripod; A sampling tube, detachably connected to the bottom of the connecting rod, is configured to contain the target soil sample; A connecting groove is formed on the inner wall of the sampling cylinder, and a rotating blade is provided in the connecting groove; A rotary drive mechanism is located between the sampling tube and the rotary blade. It is used to drive the rotary blade to rotate when the soil in the sampling tube reaches a predetermined amount, so as to cut the connection between the target soil sample and the continuous soil below.

[0011] Furthermore, the tripod is equipped with a linear drive component, the output axis of which extends upward and connects to the bottom of the connecting bracket.

[0012] Furthermore, the rotary drive mechanism includes a push plate disposed inside the sampling cylinder, a connecting strip connected to the top of the push plate, the connecting strip extending upward to the top of the sampling cylinder and connected to a connecting frame, a first connecting cylinder connected to the top of the rotary blade, a straight opening opened on the inner wall of the first connecting cylinder, a limiting shaft connected to the bottom of the connecting frame, a limiting block connected to the limiting shaft, the limiting shaft extending downward into the first connecting cylinder, the limiting block slidingly engaging within the straight opening, and a first elastic element connected between the first connecting cylinder and the sampling cylinder.

[0013] Furthermore, the bottom of the sampling tube is provided with a bottom cover, the outer wall of the sampling tube is provided with a receiving groove, a sliding strip is slidably connected in the receiving groove, a second connecting tube is fixed to the outer wall of the first connecting tube, a spiral opening is provided on the outer wall of the second connecting tube, a push block is connected to the sliding strip, and the push block is slidably engaged with the spiral opening; The top of the push plate is equipped with a pressure sensor and a buzzer.

[0014] Furthermore, the outer wall of the connecting rod is provided with two impact rods, and an impact mechanism is provided between the connecting bracket and the impact rods to drive the impact rods to move up and down intermittently and apply force to the sampling cylinder.

[0015] Furthermore, the impact mechanism includes a force-applying rod slidably connected to the connecting rod, a plurality of elastic strips connected to the outer wall of the force-applying rod, a sliding channel opened on the outer wall of the connecting rod, the elastic strips extending into the sliding channel, a connecting plate provided on the connecting rod, and the impact rod slidably connected to the connecting plate.

[0016] Furthermore, a lifting ring is connected to the top of the impact rod, and a snap-fit ​​cavity is formed between every two adjacent elastic strips, the height of which is greater than the thickness of the lifting ring.

[0017] Furthermore, a spline groove is provided at the bottom of the connecting rod, and a spline shaft is slidably connected in the spline groove. The spline shaft extends downward and is threadedly connected to the sampling cylinder.

[0018] Furthermore, a magnet is provided inside the spline groove, and the spline shaft is magnetically attracted to the magnet.

[0019] Furthermore, the impact mechanism also includes a support frame connected to the connecting bracket, a rocker arm rotatably connected to the support frame, a connecting platform connected to the top of the force-applying rod, a sleeve rotatably connected inside the connecting platform, and the rocker arm slidingly engaging with the sleeve.

[0020] Furthermore, the impact rod is also provided with an elastic energy storage component located below the connecting disc. The elastic energy storage component includes a first connecting ring fixed to the outer wall of the impact rod, a second connecting ring at the top of the first connecting ring, a second elastic component connecting the first connecting ring and the second connecting ring, and a limit strip connected to the top of the first connecting ring.

[0021] Furthermore, the impact mechanism also includes a linkage rotating part disposed between the connecting rod and the connecting disc, which is used to drive the connecting disc to rotate by a predetermined angle when the force-applying rod is displaced downward to a predetermined position.

[0022] Compared with existing technologies, the heavy metal soil pollution remediation method and soil sampling device for soil pollution remediation provided in this application can achieve at least one of the following beneficial effects: 1. The soil sampling device for heavy metal soil pollution remediation provided in this application, by setting a rotating blade inside the sampling tube, and in conjunction with a push plate, connecting strip, connecting frame, first connecting tube, limiting shaft, limiting block and first elastic element, keeps the rotating blade in a retracted state at the initial sampling stage, ensuring that the target soil sample at the predetermined depth can enter the sampling tube normally; when the soil volume reaches the preset value, the rotating blade is driven to rotate, cutting the connection between the target soil sample and the lower continuous soil, so that the two form a clear separation relationship; after the cutting is completed, the target soil sample and the lower continuous soil break apart and separate. At this time, the rotating blade can play a supporting role for the columnar soil sample in the sampling tube, supporting and preventing the soil sample from falling out during the lifting process, thereby ensuring the integrity of soil sampling and improving the sampling success rate.

[0023] 2. The heavy metal soil pollution remediation method proposed in this application uses a soil sampling device for heavy metal soil pollution remediation to conduct in-situ soil sampling at multiple sampling points in the area to be remediated at a predetermined depth. This not only accurately obtains undisturbed soil samples at the predetermined depth, providing accurate samples for the detection and analysis of heavy metal pollution in the soil, but also has high sampling efficiency, effectively improving the work efficiency before formulating a soil pollution remediation plan, and helping to accurately formulate a remediation plan in the future. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings. Figure 1 This is a schematic diagram of the sampling cylinder structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 2 This is a cross-sectional schematic diagram of the sampling tube structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 3 yes Figure 2 Enlarged schematic diagram of the local structure at point A; Figure 4 This is a schematic diagram of the rotating blade structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention. Figure 5 This is another schematic diagram of the rotating blade structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 6 This is a schematic diagram of the overall structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention. Figure 7This is another schematic diagram of the overall structure of the soil sample collection device for heavy metal soil pollution remediation provided by the present invention; Figure 8 This is a schematic diagram of the rocker arm structure of the soil sample collection device for heavy metal soil pollution remediation provided by the present invention; Figure 9 This is a schematic diagram of the connecting rod structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 10 This is another schematic diagram of the connecting rod structure of the soil sampling device for heavy metal soil pollution remediation provided by the invention. Figure 11 This is another schematic diagram of the connecting rod structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 12 This is a cross-sectional schematic diagram of the connecting rod structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 13 This is a schematic diagram of the elastic strip structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention. Figure 14 This is a schematic diagram of the elastic energy storage component structure of the soil sample collection device for heavy metal soil pollution remediation provided by the present invention; Figure 15 This is a schematic diagram of the connecting plate structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 16 This is a schematic diagram of the pressure bar structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention; Figure 17 This is a schematic diagram of the rotating sleeve structure of the soil sampling device for heavy metal soil pollution remediation provided by the present invention.

[0025] Figure label: 100. Tripod; 101. Connecting bracket; 102. Connecting rod; 103. Sampling cylinder; 104. Linkage rotating part; 105. Impact rod; 106. Linear drive component; 107. Rotary drive mechanism; 108. Impact mechanism; 200. Connecting groove; 201. Rotating blade; 202. Push plate; 203. Connecting strip; 204. Connecting frame; 205. First connecting cylinder; 206. Straight opening; 207. Limiting shaft; 208. Limiting block; 209. First elastic element; 210. Bottom cover; 211. Receiving groove; 212. Sliding strip; 213. Second connecting cylinder; 214. Spiral opening; 215. Push block; 216. Pressure sensor; 217. Buzzer; 300, Spline groove; 301, Spline shaft; 302, Magnet; 400. Force bar; 401. Elastic strip; 402. Sliding channel; 403. Connecting plate; 404. Lifting ring; 405. Snap-fit ​​cavity; 406. First connecting ring; 407. Second connecting ring; 408. Second elastic element; 409. Limiting strip; 500, Support frame; 501, Rocker arm; 502, Connecting platform; 503, Sleeve; 600, First gear; 601, Second gear; 602, Third gear; 603, Rotating sleeve; 604, Straight segment; 605, Helical segment; 606, Pressure rod; 607, Guide rod; 608, Second elastic element; 609, Ratchet mechanism. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] To facilitate understanding of the embodiments of this application, further explanation and description will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application. In the drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0028] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art. Example 1

[0029] A specific embodiment of the present invention, such as Figures 1 to 17 The invention discloses a soil sampling device for heavy metal soil pollution remediation, comprising: Tripod 100 is used to provide support at the sampling location; Connecting bracket 101 is located on top of tripod 100; Connecting rod 102 is connected to connecting bracket 101. Connecting rod 102 extends downward from connecting bracket 101 through tripod 100 to the bottom of tripod 100. Sampling cylinder 103 is detachably connected to the bottom of connecting rod 102 and is configured to contain target soil sample; The sampling cylinder 103 has a connecting groove 200 on its inner wall. A rotating blade 201 is rotatably mounted in the connecting groove 200. A rotating drive mechanism 107 is provided between the sampling cylinder 103 and the rotating blade 201. The rotating drive mechanism 107 is used to drive the rotating blade 201 to rotate when the amount of soil entering the sampling cylinder 103 reaches a predetermined amount, so as to cut the connection between the target soil sample in the sampling cylinder 103 and the continuous soil below.

[0030] With the above setup, the tripod 100 provides stable support for the overall sampling process, the connecting bracket 101 drives the connecting rod 102 to move vertically downward, the connecting rod 102 transmits the downward movement to the sampling tube 103, the sampling tube 103 enters the target soil layer and contains the soil sample at the corresponding depth; when the amount of soil entering the sampling tube 103 reaches a predetermined amount, the rotary drive mechanism 107 drives the rotating blade 201 to rotate, cutting the connection between the target soil sample and the lower continuous soil in the sampling tube 103. After the target soil sample is separated from the lower continuous soil, the sampling tube is lifted to the ground, completing the soil sample collection at the target depth.

[0031] In practical use, pre-drilled holes can be pre-formed at predetermined sampling locations based on the sampling point layout of the area to be tested. These pre-drilled holes can be formed using drilling equipment with helical blades. Since the helical blades will cut and break up the soil along the drilling path during the drilling process, the loose soil and debris generated during drilling can be promptly removed from the hole after pre-drilling to reduce the impact of residual soil debris on subsequent sampling. The depth of the pre-drilled hole is controlled to be no deeper than the target sampling depth, so that the sampling cylinder 103 can continue to descend into the target soil layer along the predetermined position during subsequent downward movement.

[0032] If the pre-drilled hole exceeds the target sampling depth, the soil at the target sampling depth may have been disturbed, cut, broken, or carried out beforehand, thereby damaging the original stratum state of the soil sample at that depth, which is not conducive to obtaining a relatively complete undisturbed soil sample at the target depth. However, by controlling the depth of the pre-drilled hole to be no deeper than the target sampling depth, the resistance of the upper soil layer to the insertion of the sampling tube 103 can be reduced, while the undisturbed soil to be collected at the target sampling depth can still be preserved, so that the sampling tube 103 can collect the target soil sample when it continues to be inserted.

[0033] Compared with the conventional method of obtaining soil samples by spiral cutting and turning conveyor, the soil sampling device in this embodiment uses the connecting bracket 101 and connecting rod 102 to allow the sampling tube 103 to enter the target soil layer vertically downward for sampling. This allows the soil sample at the target depth to enter the sampling tube 103 in a more intact state, which helps to maintain the integrity of the soil sample and the corresponding stratification relationship, thereby improving the accuracy of stratified sampling of heavy metal contaminated soil.

[0034] Based on the above embodiment, a linear drive component 106 is provided on the tripod 100. The output axis of the linear drive component 106 extends upward and is connected to the bottom of the connecting bracket 101. With the above arrangement, the linear drive component 106 is fixed on the tripod 100, and can apply a vertical linear driving force to the connecting bracket 101 with the tripod 100 as a supporting base, so that the connecting bracket 101 moves vertically relative to the tripod 100. During the vertical lifting and lowering process, the connecting bracket 101 drives the connecting rod 102 to move synchronously, thereby driving the sampling tube 103 to enter the soil layer downward or exit the soil layer upward, so as to realize the insertion and extraction of the sampling tube 103.

[0035] During sampling, after the pre-drilled hole is formed and the loose soil inside is cleared, the linear drive 106 drives the connecting bracket 101 and connecting rod 102 downwards, causing the sampling cylinder 103 to be lowered along the pre-drilled hole. When the sampling cylinder 103 moves to its bottom and touches the target soil layer, the connecting bracket 101 and connecting rod 102 continue to move downwards, further pressing the sampling cylinder 103 into the target soil layer. Soil from the target area enters the sampling cylinder 103 from its bottom as it continues to move downwards, thus completing the soil sample loading. After the sampling cylinder 103 continues to move downwards to the predetermined depth, the linear drive 106 drives the connecting bracket 101 and connecting rod 102 upwards, causing the sampling cylinder 103, along with the soil sample inside, to be pulled out as a whole, thus obtaining a soil sample at the corresponding depth in the target area.

[0036] In some embodiments, the linear drive 106 is either an electric actuator or a hydraulic cylinder.

[0037] In some alternative embodiments, the rotary drive mechanism 107 includes a push plate 202 disposed inside the sampling cylinder 103. A connecting strip 203 is connected to the top of the push plate 202. The connecting strip 203 extends upward to the top of the sampling cylinder 103 and is connected to a connecting frame 204. A first connecting cylinder 205 is connected to the top of the rotating blade 201. A straight opening 206 is provided on the inner wall of the first connecting cylinder 205. A limiting shaft 207 is connected to the bottom of the connecting frame 204. A limiting block 208 is connected to the limiting shaft 207. The limiting shaft 207 extends downward into the first connecting cylinder 205. The limiting block 208 is slidably engaged in the straight opening 206. A first elastic member 209 is connected between the first connecting cylinder 205 and the sampling cylinder 103.

[0038] Specifically, the connecting groove 200 is used to accommodate the rotating blade 201, so that the rotating blade 201 can be retracted into the inner wall of the sampling cylinder 103 when not in operation, reducing the impact on the soil feeding process of the sampling cylinder 103. The first connecting cylinder 205 is fixedly connected to the rotating blade 201, so the rotation of the first connecting cylinder 205 can drive the rotating blade 201 to rotate synchronously. In this embodiment, the first elastic element 209 can be a torsion spring, which is connected between the first connecting cylinder 205 and the sampling cylinder 103. In the initial state after assembly, the first elastic element 209 is in a pre-torsion state, with a restoring force that drives the first connecting cylinder 205 to rotate, and the rotating blade 201 is in a retracted state in this initial state. The engagement of the limiting block 208 and the linear opening 206 is used to restrict the rotation state of the first connecting cylinder 205. In the initial sampling stage, the limiting block 208 is located inside the linear opening 206. Although the first connecting cylinder 205 is subjected to the torsional action of the first elastic element 209, its rotation is still constrained by the limiting block 208. Therefore, the rotating blade 201 remains in a retracted state and does not rotate.

[0039] During sampling, the sampling tube 103 is inserted downwards along with the connecting rod 102 and enters the target soil layer. Soil enters the sampling tube 103 from the bottom. As more soil enters the sampling tube 103, the soil sample exerts an upward pushing force on the push plate 202, thereby pushing the push plate 202 upwards. When the push plate 202 moves upwards, the connecting frame 204 moves upwards synchronously through the connecting strip 203, causing the limiting shaft 207 to move upwards relative to the first connecting tube 205. Since the limiting block 208 slides within the straight opening 206, in the initial stage of the push plate 202 moving upwards, the limiting block 208 only moves along the extension direction of the straight opening 206, thus maintaining a limiting effect on the first connecting tube 205, and the rotating blade 201 will not rotate prematurely. This setting allows the rotating blade 201 to remain in a retracted state during the insertion of the sampling tube 103 and the initial soil entry stage, thereby preventing the rotating blade 201 from moving prematurely and interfering with normal soil entry.

[0040] When the sampling tube 103 is inserted to the target sampling depth and the soil sample entering the sampling tube 103 reaches the predetermined amount, the pushing force of the soil sample on the push plate 202 continues to increase. The push plate 202 drives the connecting strip 203, the connecting frame 204, and the limiting shaft 207 to move further upward until the limiting block 208 gradually disengages from the straight opening 206. At this time, the first connecting tube 205 loses the rotational constraint of the limiting block 208, and the first elastic element 209 releases the pre-stored torsional potential energy, thereby driving the first connecting tube 205 to rotate instantaneously, which in turn drives the rotating blade 201 to quickly switch from the retracted state to the extended state. After the rotating blade 201 rotates, it can cut the side wall circumference of the lower end of the columnar soil sample entering the sampling tube 103, so that the columnar soil sample is cut off at the cutting position, and a clearer separation relationship is formed between the target soil sample in the sampling tube 103 and the continuous soil below, thereby improving the integrity of the soil sample taken out at the target depth. It should be noted that in some extreme cases, if the columnar soil sample is hard or contains stones, the rotating blade 201 may not cut the columnar soil sample directly, but instead form a groove of a certain depth on the side wall of the columnar soil sample. In this case, the columnar soil sample may break off from the soil below at the groove location by actions such as the upper extraction tube 103.

[0041] Furthermore, after the rotating blade 201 completes its rotation, it forms a lateral obstruction relative to the inside of the sampling cylinder 103. When the connecting rod 102 pulls the sampling cylinder 103 upward, the rotating blade 201 not only maintains the separation of the cut soil sample but also supports and obstructs the soil sample inside the sampling cylinder 103. Compared to structures that rely solely on the cylinder to directly contain the soil sample, this embodiment uses the upward movement of the push plate 202 under the pushing action of the soil sample to trigger the rotating blade 201 to rotate and cut the soil after the predetermined amount of soil has been introduced. This ensures smooth soil introduction in the initial sampling stage, and also allows the target soil sample to be separated from the soil below in a timely manner after entering the sampling cylinder. After the separation is completed, the rotating blade 201 is lifted and obstructed to prevent the separated soil sample from falling out of the sampling cylinder, thereby helping to maintain the integrity of the soil sample at the target depth and the corresponding strata.

[0042] In some embodiments, the number and size of the rotating blades 201 can be adjusted according to the size of the sampling cylinder 103 and the actual sampling requirements.

[0043] In this embodiment, the sampling tube 103 has ventilation holes on its side wall and top. With the above arrangement, during the process of the sampling tube 103 being inserted downwards to accommodate the soil sample, the original air inside the sampling tube 103 can be discharged outwards through the ventilation holes on the side wall and top.

[0044] In this embodiment, the pore diameter of the vent is 0.1 mm to 0.3 mm, so as to ensure the venting effect while reducing the possibility of soil sample loss through the vent, thereby balancing normal soil intake and soil sample integrity.

[0045] In this embodiment, the wall thickness of the sampling tube 103 is 3mm to 5mm, so as to ensure that the sampling tube 103 has sufficient structural strength while providing a large installation and housing space for the rotating blade 201. This allows the rotating blade 201 to be configured with a certain width to ensure its cutting action after rotation. Furthermore, when the rotating blade 201 is in the retracted state, the larger wall thickness also allows the rotating blade 201 to be better housed within the wall of the sampling tube 103, preventing the rotating blade 201 from protruding excessively from the inner wall of the sampling tube 103, thereby reducing the impact on the normal entry of the soil sample into the sampling tube 103.

[0046] In this embodiment, the sampling cylinder 103 has a length of 20cm to 30cm and a side length of 6cm to 8cm. Correspondingly, the area of ​​the bottom opening of the sampling cylinder 103 is 36cm² to 64cm². The rotating blades 201 are housed within the connecting grooves 200 and rotate around the first connecting cylinder 205 as the center of rotation. Four rotating blades 201 are provided. Correspondingly, four connecting grooves 200 are also provided, each corresponding to one of the four rotating blades 201, to accommodate each rotating blade 201.

[0047] When the rotating blade 201 rotates from the retracted state to the extended state, its rotation angle is preferably no more than 90°, so that after rotating out, the rotating blade 201 can cut the connection between the target soil sample and the underlying continuous soil, and form a blocking effect on the soil sample during the upward process. Furthermore, the length of the rotating blade 201 is preferably two-thirds of the distance from the center of the bottom opening of the sampling tube 103 to the inner side of the corresponding side wall; when the side length of the sampling tube 103 is 6cm to 8cm, the length of the rotating blade 201 is preferably 2cm to 2.67cm, so as to ensure that the rotating blade 201 has sufficient cutting length while being well housed in the connecting groove 200 in the retracted state, avoiding excessive protrusion from the inner wall of the sampling tube 103 and affecting normal soil intake.

[0048] Based on the above embodiment, the sampling cylinder 103 has a bottom cover 210, and a receiving groove 211 is formed on the outer wall of the sampling cylinder 103. A sliding strip 212 is slidably connected in the receiving groove 211. A second connecting cylinder 213 is fixed to the outer wall of the first connecting cylinder 205. A spiral opening 214 is formed on the outer wall of the second connecting cylinder 213. A push block 215 is connected to the sliding strip 212, and the push block 215 is slidably engaged with the spiral opening 214. With the above configuration, the sliding strip 212 can slide relative to the sampling cylinder 103 along the extension direction of the receiving groove 211. The push block 215, as a force transmission part, engages with the spiral opening 214 to convert the rotational motion of the second connecting cylinder 213 into the linear movement of the sliding strip 212 when the second connecting cylinder 213 rotates. The bottom cover 210 is located at the bottom of the sampling tube 103. It can seal the bottom of the sampling tube 103 after sampling to reduce soil sample falling, and can also apply a reset action to the second connecting tube 213 during the fastening process to cooperate with the rotating blade 201 to return to the initial state.

[0049] Specifically, before sampling, the bottom cover 210 is removed from the bottom of the sampling cylinder 103 to keep the bottom of the sampling cylinder 103 open, thus facilitating the entry of soil into the sampling cylinder 103 from the bottom. At this time, the rotating blade 201 is housed in the connecting groove 200 and is in a retracted state. The sliding strip 212 is located in the receiving groove 211 at its upper limit position, and the push block 215 is located at the initial engagement position of the spiral opening 214. During the insertion of the sampling cylinder 103, even if friction occurs between the pre-drilled hole wall or the soil hole wall and the sliding strip 212, the sliding strip 212 will not continue to move upward due to the friction. Therefore, the second connecting cylinder 213 will not be affected by the engagement relationship between the push block 215 and the spiral opening 214, thus ensuring that the rotating blade 201 remains stably retracted in the initial sampling stage.

[0050] Subsequently, the sampling tube 103 is inserted downwards to the target sampling depth, and soil enters the sampling tube 103 from the bottom. When the predetermined amount of soil sample enters the sampling tube 103, the soil sample pusher plate 202 moves upwards, thereby releasing the restriction on the first connecting tube 205. The first elastic element 209 releases torsional potential energy, driving the first connecting tube 205 to rotate. Since the second connecting tube 213 is fixed to the outer wall of the first connecting tube 205, the rotation of the first connecting tube 205 can drive the second connecting tube 213 to rotate synchronously. During the rotation of the second connecting tube 213, the side wall of the spiral opening 214 applies a guiding effect to the push block 215 along the spiral trajectory, causing the push block 215 to drive the sliding strip 212 to slide downwards along the receiving groove 211. Thus, the displacement of the sliding bar 212 and the unfolding action of the rotating blade 201 are linked. The rotating blade 201 rotates to cut the connection between the target soil sample and the lower continuous soil. After the cut is broken, the rotating blade 201 can also lift the columnar soil sample in the sampling tube 103 to prevent it from falling out of the sampling tube.

[0051] After sampling is completed, the connecting rod 102 moves the sampling cylinder 103 upward until it is completely removed and leaves the pre-drilled hole. Once the sampling cylinder 103 has left the pre-drilled hole, the bottom cover 210 is then fastened to the bottom of the sampling cylinder 103 to seal the lower opening and reduce the possibility of soil samples falling out during transfer. During the capping process, the end of the bottom cover 210 pushes against the sliding strip 212, causing it to slide upward along the receiving groove 211. The push block 215 connected to the sliding strip 212 pushes against the side wall of the spiral opening 214 during its upward movement, thereby causing the second connecting cylinder 213 to rotate in the opposite direction. If soil remains between the sliding strip 212 and the receiving groove 211, a brush can be used to clean the brushed area to reduce the impact of soil residue on the sliding strip 212's return to its original position.

[0052] Since the second connecting cylinder 213 is fixed to the outer wall of the first connecting cylinder 205, the reverse rotation of the second connecting cylinder 213 further drives the first connecting cylinder 205 to rotate in the opposite direction, thereby causing the rotating blade 201 to return from the unfolded state to the retracted state. At the same time, the first elastic element 209 re-enters the pre-torsion state to store potential energy for the next soil cutting action. Furthermore, since the push plate 202 is in the upward state after sampling, and the connecting strip 203 and the connecting frame 204 extend upward relative to each other, the connecting frame 204 can be pressed down to make the connecting strip 203 drive the push plate 202 to fall back, and the limiting shaft 207 is re-inserted downward into the first connecting cylinder 205, so that the limiting block 208 re-enters the straight opening 206, thereby restoring the limiting state of the first connecting cylinder 205 and completing the reset of the entire rotary drive mechanism 107 for the next sampling.

[0053] In another embodiment, after sampling is completed and the sampling cylinder 103 is removed from the pre-drilled hole, the bottom cover 210 can be fastened to the bottom of the sampling cylinder 103 to close the lower opening of the sampling cylinder 103. During the fastening process of the bottom cover 210, the bottom cover 210 pushes the sliding strip 212 upward to reset, and through the cooperation of the push block 215 and the spiral opening 214, drives the second connecting cylinder 213 and the first connecting cylinder 205 to rotate in the opposite direction, so that the rotating blade 201 returns to the retracted state. After the above actions are completed, the sampling cylinder 103 and the related components provided on the sampling cylinder 103 can be processed in different ways according to actual usage requirements.

[0054] Specifically, in some application scenarios, the sampling cylinder 103 and components such as the bottom cover 210, rotating blade 201, push plate 202, connecting strip 203, connecting frame 204, first connecting cylinder 205, second connecting cylinder 213, and sliding strip 212 set on the sampling cylinder 103 can be set as disposable parts. After completing a single sampling, sealing and soil sample transfer, the entire sampling cylinder 103 and its supporting components can be replaced to reduce the possibility of cross-contamination between different sampling points. This is especially suitable for sampling scenarios where the degree of heavy metal pollution varies greatly or where the detection accuracy requirement is high.

[0055] In other application scenarios, the sampling cylinder 103 and the aforementioned components mounted on it can also be used as reusable parts. After sampling, sealing, and soil sample transfer are completed, the sampling cylinder 103 and related components are cleaned, reset, and checked for condition. Only after confirming that the rotating blade 201, push plate 202, sliding bar 212, and rotating drive mechanism 107 have returned to their initial standby state can they be used for sampling at the next sampling point. Through this setup, the sampling cylinder 103 and its accessories can be used for one-time replacement or for repeated cleaning and reuse, thus adapting to the different requirements of various pollution control sites regarding sampling cost, sampling efficiency, and prevention of cross-contamination.

[0056] Based on the above embodiments, the top of the push plate 202 may also be equipped with a pressure sensor 216 and a buzzer 217. During the sampling process, when the soil sample enters the sampling cylinder 103 and pushes the push plate 202 upward until the push plate 202 contacts the inner top surface of the sampling cylinder 103, the pressure sensor 216 outputs a signal and triggers the buzzer 217 to sound, so as to prompt the operator that the push plate 202 has moved to the correct position; at this time, the limiting block 208 on the limiting shaft 207 just disengages from the straight opening 206, the first connecting cylinder 205 is released from the limit, and the rotating blade 201 completes the rotational cutting of the soil under the action of the first elastic element 209, indicating that the target soil sample has entered the sampling cylinder 103 and the sampling has been completed. At this point, the sampling tube 103 should be stopped from moving downwards. This is because the rotating blade 201 has completed its rotation and is now in the unfolded state, forming a cutting and blocking structure inside the sampling tube 103. If the sampling tube 103 continues to move downwards, the rotating blade 201 will press against and interfere with the unsampled soil below. This will increase the resistance to further insertion of the sampling tube 103 and further compress the target soil sample that has already been cut, thus affecting the integrity of the soil sample.

[0057] In another embodiment, a controller is connected between the pressure sensor 216 and the buzzer 217. The pressure sensor 216, buzzer 217, and controller can all be existing equipment. The pressure sensor 216, buzzer 217, and controller are all electrically connected to a power supply, which can be a battery. The battery can be installed on the outer wall of the sampling cylinder 103, on the connecting frame 204, or in another convenient location that does not affect sampling. During sampling, when the push plate 202 has not moved to the predetermined position, the pressure sensor 216 does not output a trigger signal, and the buzzer 217 remains silent. When the push plate 202 moves upward under the pushing action of the soil sample, triggering the pressure sensor 216, the pressure sensor 216 outputs a position signal to the controller. The controller then controls the buzzer 217 to emit a prompt sound to alert the operator that the push plate 202 has moved to the correct position. The prompt tone can be set to continuous beeping or intermittent beeping, such as issuing two short beeps in succession, so that the operator can promptly identify the sampling completion status in the field environment and stop moving the sampling tube 103 down.

[0058] Based on the above embodiment, the outer wall of the connecting rod 102 is provided with two impact rods 105, and an impact mechanism 108 is provided between the connecting bracket 101 and the impact rods 105 for driving the impact rods 105 to intermittently move up and down to apply force to the sampling cylinder 103. Specifically, the impact mechanism 108 includes a force-applying rod 400 slidably connected to the connecting rod 102, a plurality of elastic strips 401 connected to the outer wall of the force-applying rod 400, a sliding channel 402 opened on the outer wall of the connecting rod 102, the elastic strips 401 extending into the sliding channel 402, a connecting plate 403 provided on the connecting rod 102, the impact rods 105 slidably connected to the connecting plate 403, and a lifting ring 404 connected to the top of the impact rods 105. A snap-fit ​​cavity 405 is formed between every two adjacent elastic strips 401, and the height of the snap-fit ​​cavity 405 is greater than the thickness of the lifting ring 404. With the above settings, the lifting ring 404 can be locked in the locking cavity 405 at the corresponding height position, so that when the force bar 400 moves upward, it can drive the impact bar 105 to rise synchronously, and after subsequent release, the impact bar 105 will fall and impact, so that when the sampling cylinder 103 has a large insertion resistance, an intermittent impact force can be applied to the sampling cylinder 103.

[0059] In practical use, when the linear drive 106 drives the connecting bracket 101 downwards, and the sampling cylinder 103 encounters a hard soil layer or significant insertion resistance during insertion, the impact mechanism 108 can be activated. Initially, the lifting ring 404 is engaged in one of the engagement cavities 405. At this time, when the force rod 400 moves upwards, the elastic strip 401 forming the engagement cavity 405 exerts an upward lifting force on the lifting ring 404, thereby driving the impact rod 105 upwards synchronously. As the force rod 400 continues to move upwards, the impact rod 105 is gradually lifted to a higher position. When the impact rod 105 reaches its limit position, the elastic strip 401 undergoes elastic deformation during continued movement, releasing the engagement with the lifting ring 404, and the lifting ring 404 disengages from the corresponding engagement cavity 405. When the last elastic strip 401 located below the lifting ring 404 also disengages from the lifting ring 404, the impact rod 105 loses its upward lifting force and slides downward along the connecting plate 403 under its own gravity, applying an impact force to the sampling cylinder 103 below. Through this arrangement, the impact rod 105 can first rise and accumulate momentum under the lifting action of the force application rod 400, and then fall freely after disengagement, thus forming an intermittent impact action.

[0060] Through the aforementioned lifting, disengaging, and lowering processes, the impact rod 105 can repeatedly rise and fall, thereby intermittently impacting the sampling cylinder 103. This allows the sampling cylinder 103 to continue its downward insertion even when encountering harder soil layers. As the sampling process progresses, the sampling cylinder 103 is gradually inserted under the impact, and the working position of the impact rod 105 relative to the connecting rod 102 also decreases accordingly. Since the outer wall of the force-applying rod 400 is provided with multiple elastic strips 401, multiple locking cavities 405 are formed at different heights. Therefore, after the lifting ring 404 descends with the impact rod 105, it can still re-engage with the lower locking cavity 405, allowing the force-applying rod 400 to continue driving the impact rod 105 upward when it moves upward again, and then fall down again after disengaging, thus maintaining the continuous impact action.

[0061] If the impact mechanism 108 is not provided, and the linear drive 106 is used to continuously press down on the connecting rod 102 and the sampling cylinder 103, the insertion resistance will increase significantly when the sampling cylinder 103 is inserted into a denser or harder soil layer. This makes it difficult for the sampling cylinder 103 to continue inserting, thus affecting normal sampling at the target depth. Simply increasing the continuous downward pressure will increase the overall stress on the device, which is not conducive to stable insertion. Therefore, by providing the impact rod 105 and the mating structure of multiple locking cavities 405 formed by multiple elastic strips 401, the lifting and lowering relationship can be re-established after the working position of the impact rod 105 moves down with the sampling cylinder 103. This allows the impact rod 105 to continuously have the conditions for repeated lifting and releasing, thereby continuously providing intermittent impact force to the sampling cylinder 103. Compared to a single locking structure, the multiple locking cavities 405 are more conducive to maintaining the continuity of the impact action during the process of constantly changing sampling depth, thereby improving the insertion capability of the sampling cylinder 103 in harder soil layers.

[0062] It is worth noting that during the sampling process, the impact rod 105 repeatedly falls and applies force to the sampling cylinder 103, causing the sampling cylinder 103 to gradually penetrate downwards into the soil layer relative to the connecting rod 102 under the impact. Since the impact rod 105 needs to continue applying force to the sampling cylinder 103 after each impact, the actual working position of the impact rod 105 changes with the position of the sampling cylinder 103. That is, as the sampling cylinder 103 is gradually inserted, the static position of the impact rod 105 relative to the connecting rod 102 also gradually moves downwards. To ensure that the force-applying rod 400 can still effectively drive the impact rod 105 upwards during repeated lifting and pressing, multiple elastic strips 401 are provided on the outer wall of the force-applying rod 400 to form multiple locking cavities 405 of different heights between adjacent elastic strips 401. When the impact rod 105 descends relative to the connecting rod 102 due to the insertion of the sampling cylinder 103, the lifting ring 404 can re-engage with the lower-positioned locking cavity 405, thereby allowing the force-applying rod 400 to continue driving the impact rod 105 upward during the next upward movement. By setting multiple elastic strips 401 and multiple locking cavities 405, the impact rod 105 can always be repeatedly lifted and released throughout the entire process of the gradual insertion of the sampling cylinder 103, thus ensuring that the impact rod 105 can continuously and intermittently apply impact force to the sampling cylinder 103.

[0063] If only a single snap-fit ​​structure is set, as the sampling cylinder 103 is gradually inserted, the position of the impact rod 105 relative to the connecting rod 102 continues to decrease, and the lifting ring 404 is easy to disengage from the original snap-fit ​​position and cannot be effectively lifted again, thus affecting the continuity of subsequent impact actions.

[0064] If a ratchet or pawl is used to gradually lift and position the impact rod 105, it can accommodate the gradual downward movement of the impact rod 105 relative to the connecting rod 102 to some extent. However, ratchet and pawl structures typically have a one-way anti-reverse characteristic, meaning they only allow the component to move gradually in one direction and are difficult to automatically return to the initial position without unlocking. Specifically, during a sampling process, as the impact rod 105 repeatedly applies force to the sampling cylinder 103, the sampling cylinder 103 gradually inserts relative to the connecting rod 102, and the position of the impact rod 105 relative to the connecting rod 102 gradually decreases. The ratchet and pawl structure gradually locks this downward displacement. After a sampling is completed, the impact rod 105, the sampling cylinder 103, and the associated lifting engagement positions have all deviated from their initial positions. If the ratchet and pawl structure is not unlocked, the impact rod 105 will find it difficult to move back to the initial lifting position, and it will be difficult to re-establish a stable lifting and releasing relationship, thus affecting the next sampling operation.

[0065] To this end, by setting multiple elastic strips 401 on the outer wall of the force-applying rod 400 and using adjacent elastic strips 401 to form multiple locking cavities 405, the lifting ring 404 can engage with the corresponding locking cavity 405 at different height positions. In this way, the impact mechanism can cycle through the following sequence: the lifting ring 404 engages, the force-applying rod 400 is lifted, the elastic strips 401 deform and disengage, the impact rod 105 falls freely and impacts, and the lifting ring 404 re-engages with the next locking cavity 405. This improves the stability and adaptability of the impact mechanism in continuously applying force to the sampling cylinder 103.

[0066] In this embodiment, a spline groove 300 is provided at the bottom of the connecting rod 102, and a spline shaft 301 is slidably connected within the spline groove 300. The spline shaft 301 extends along the length of the connecting rod 102 and is threaded downwards to the sampling cylinder 103. Through the cooperation of the spline groove 300 and the spline shaft 301, the vertical movement of the spline shaft 301 and the sampling cylinder 103 can be guided, keeping the sampling cylinder 103 moving vertically, and the circumferential rotation of the spline shaft 301 relative to the connecting rod 102 can be restricted, thereby improving the stability of the sampling cylinder 103 during the lowering and insertion process.

[0067] A magnet 302 is provided inside the spline groove 300, and the spline shaft 301 is magnetically attracted to the magnet 302. During the lowering stage of the sampling cylinder 103, the magnet 302 holds the spline shaft 301, so that the connecting rod 102 can drive the spline shaft 301 and the sampling cylinder 103 to move synchronously, so as to stably lower the sampling cylinder 103 to the predetermined position.

[0068] In the initial state, the spline shaft 301 is magnetically attracted to the magnet 302, which provides axial holding for the spline shaft 301. Therefore, the impact force applied to the sampling cylinder 103 in the initial stage of impact must first overcome the magnetic holding force of the magnet 302 on the spline shaft 301 and the sliding resistance between the spline shaft 301 and the spline groove 300. When the impact force is greater than the sum of the magnetic holding force and the sliding resistance, the spline shaft 301 begins to detach from the magnet 302 and slides downward along the spline groove 300 relative to the connecting rod 102. The sampling cylinder 103 then continues to insert into the soil layer relative to the connecting rod 102. In other words, before the spline shaft 301 and the magnet 302 detach, the magnetic holding force will have an initial counteracting effect on the impact insertion, and this counteracting effect is mainly manifested in the initial impact stage before the moment of detachment.

[0069] After the spline shaft 301 detaches from the magnet 302, as the axial distance between the spline shaft 301 and the magnet 302 increases, the magnetic attraction between them weakens rapidly. Subsequently, the holding effect of the magnet 302 on the spline shaft 301 significantly decreases, no longer significantly restricting the subsequent insertion of the sampling cylinder 103. Through this design, the magnet 302 can stably attract the spline shaft 301 during the lowering stage of the sampling cylinder 103, ensuring the stability of the sampling cylinder 103 during lowering. During the impact insertion stage, the holding effect of the magnet 302 only exists in the initial detachment stage. After the spline shaft 301 detaches, the connecting rod 102 will no longer exert a continuous rigid constraint on the sampling cylinder 103, thus facilitating the continued insertion of the sampling cylinder 103 into the harder soil layer under impact.

[0070] In some embodiments, magnet 302 may also be an electromagnet. During the lowering and conventional pressing sampling phases of the sampling cylinder 103, the electromagnet remains energized to provide axial holding force on the spline shaft 301, thereby ensuring a stable driving relationship between the connecting rod 102 and the sampling cylinder 103 and preventing premature slippage of the sampling cylinder 103 relative to the connecting rod 102 during the lowering process. When the sampling cylinder 103 reaches the predetermined position and an impact force needs to be applied to it by the impact rod 105, the electromagnet can be de-energized to cancel the magnetic holding force of the electromagnet on the spline shaft 301. At this time, under the downward impact force applied by the impact rod 105, the spline shaft 301 can slide downward more easily relative to the spline groove 300, allowing the sampling cylinder 103 to continue to be inserted into the soil layer.

[0071] In this embodiment, the impact rod 105 is provided with an elastic energy storage component, which is located below the connecting plate 403. The elastic energy storage component includes a first connecting ring 406 fixed to the outer wall of the impact rod 105, a second connecting ring 407 disposed above the first connecting ring 406, and a second elastic element 408 connecting the first connecting ring 406 and the second connecting ring 407. A limiting strip 409 is also connected to the top of the first connecting ring 406. When the impact rod 105 moves upward, the first connecting ring 406 moves upward synchronously with the impact rod 105. When the second connecting ring 407 abuts against the connecting plate 403, the second connecting ring 407 stops moving upward, and the first connecting ring 406 continues to move upward and compresses the second elastic element 408 until the limiting strip 409 engages with the second connecting ring 407, thereby allowing the second elastic element 408 to store elastic potential energy.

[0072] When the lifting ring 404 disengages from the elastic strip 401, the impact rod 105 loses its upward lifting force and moves downward along the connecting plate 403. At this time, the second elastic element 408 releases its elastic potential energy, providing additional downward force to the impact rod 105 through the first connecting ring 406 and the second connecting ring 407, so that the impact rod 105 impacts the sampling cylinder 103 under the combined action of its own weight and the restoring force of the second elastic element 408.

[0073] As the sampling process proceeds, the sampling cylinder 103 is gradually inserted, and the initial position of the impact rod 105 decreases after each impact, while its release position remains essentially unchanged. Therefore, the descent stroke of subsequent impacts gradually increases, and the impact effect is correspondingly enhanced. The second elastic element 408 mainly serves to supplement energy storage and increase impact, and works in conjunction with the gradually increasing descent stroke to improve the sampling cylinder 103's ability to penetrate harder soil layers.

[0074] In the initial state, the first connecting ring 406 and the second connecting ring 407 are located below the connecting plate 403, and the second elastic element 408 is in its natural state. The elastic potential energy of each elastic strip 401 is greater than the elastic potential energy stored when the second elastic element 408 is compressed. When the force rod 400 drives the lifting ring 404 upward, the impact rod 105 moves upward synchronously. The first connecting ring 406, fixed to the outer wall of the impact rod 105, moves upward synchronously with the impact rod 105, and the second connecting ring 407 also moves upward. When the second connecting ring 407 moves upward to contact the connecting plate 403, the second connecting ring 407 is limited by the connecting plate 403 and stops moving upward. At this time, the first connecting ring 406 continues to move upward with the impact rod 105, thereby gradually compressing the second elastic element 408 between the first connecting ring 406 and the second connecting ring 407 to store elastic potential energy. As the impact rod 105 continues to move upward, until the limit bar 409 touches the second connecting ring 407, the impact rod 105 moves to its limit position.

[0075] Subsequently, the force bar 400 continues to move upward, and the elastic strip 401 undergoes elastic deformation. When the last elastic strip 401 located below the lifting ring 404 disengages from the lifting ring 404, the impact rod 105 loses its upward lifting force. At this time, the impact rod 105 begins to slide downward along the connecting plate 403 under its own gravity. Simultaneously, the previously compressed second elastic element 408 releases its elastic potential energy and applies additional downward force to the impact rod 105 through the second connecting ring 407 and the first connecting ring 406. Thus, the impact rod 105 moves downward under the combined action of gravity and the restoring force of the second elastic element 408, and applies an impact force to the sampling cylinder 103 below. Compared to the method of relying solely on the weight of the impact rod 105 to fall, by setting up an elastic energy storage element, an additional downward force can be provided when the impact rod 105 releases its downward force, thereby improving the force application effect of a single impact.

[0076] The position of the connecting disc 403 relative to the connecting rod 102 remains fixed. During sampling, the sampling cylinder 103 gradually descends into the soil layer relative to the connecting rod 102 under the repeated impact of the impact rod 105. Therefore, the static position of the impact rod 105 after each impact also gradually moves downward with the sampling cylinder 103. In other words, although the ultimate release position reached by the impact rod 105 each time it moves upward is basically fixed relative to the connecting rod 102, its starting position after each impact gradually decreases. Thus, in subsequent impact cycles, the upward stroke of the impact rod 105 from the starting position to the ultimate release position gradually increases, and during the free fall after release, its downward stroke to the sampling cylinder 103 also gradually increases. Due to the increased downward stroke, the work done by the impact rod 105 under gravity increases, thus the impact energy of subsequent impacts gradually increases.

[0077] Furthermore, the maximum compression of the second elastic element 408 in each impact cycle is mainly determined by the limiting positions of the second connecting ring 407 and the connecting disc 403, as well as the engagement position of the limiting strip 409 and the second connecting ring 407. Therefore, with fixed structural dimensions, the maximum compression of the second elastic element 408 is generally consistent. Consequently, the elastic potential energy released by the second elastic element 408 in each impact is roughly stable, while the main reason for the gradual increase in impact force is that the release height of the impact rod 105 is relatively fixed, and the static position after the impact gradually decreases, thus gradually increasing the falling stroke of subsequent impacts. In other words, the effect of the gradually increasing impact force in this embodiment mainly comes from the increase in the path of gravity, while the second elastic element 408 mainly plays the role of additional energy storage and impact amplification.

[0078] In some embodiments, if no elastic energy storage element is provided, the impact rod 105 falls mainly by its own weight after disengaging from the lifting ring 404, and its single impact effect is relatively weak. Especially when the soil layer is hard or the insertion resistance of the sampling tube 103 is large, more impacts may be required to allow the sampling tube 103 to continue to be inserted. To address this, by providing an elastic energy storage element on the impact rod 105, including a first connecting ring 406, a second connecting ring 407, and a second elastic element 408, the impact rod 105 can synchronously compress the second elastic element 408 during the upward phase and superimpose the restoring force of the second elastic element 408 during the release phase. This, combined with the gradually increasing downward stroke, forms a progressively stronger impact effect, which is beneficial to improving the sampling tube 103's ability to penetrate harder soil layers.

[0079] Based on the above embodiments, the impact mechanism 108 further includes a support frame 500 connected to the connecting bracket 101. A rocker arm 501 is rotatably connected to the support frame 500, and a connecting platform 502 is connected to the top of the force-applying rod 400. A sleeve 503 is rotatably connected inside the connecting platform 502, and the rocker arm 501 and the sleeve 503 are in sliding engagement. Through this arrangement, the support frame 500 provides a swing fulcrum for the rocker arm 501. When the rocker arm 501 swings, it can drive the force-applying rod 400 to reciprocate along the length of the connecting rod 102 via the sleeve 503 and the connecting platform 502, thereby providing drive for the upward and downward movement of the force-applying rod 400. Since the sleeve 503 and the connecting platform 502 are rotatably connected, the angle change generated by the rocker arm 501 during swinging can be adapted by the sleeve 503, reducing the pressure and interference on the connecting platform 502, and making the reciprocating movement of the force-applying rod 400 smoother.

[0080] In specific operation, when the linear drive 106 presses down on the connecting rod 102 and drives the sampling cylinder 103 downward to take a sample, if the sampling cylinder 103 encounters a relatively hard soil layer and the insertion resistance increases significantly, the rocker arm 501 can be swung to drive the force application rod 400 to move up and down repeatedly. When the force application rod 400 moves upward, the elastic strip 401 at the corresponding position drives the lifting ring 404 and the impact rod 105 to rise synchronously; when the impact rod 105 rises to the predetermined release position, the elastic strip 401 undergoes elastic deformation and disengages from the lifting ring 404, and the impact rod 105 then moves downward along the connecting plate 403 and applies an impact force to the sampling cylinder 103. Subsequently, as the rocker arm 501 continues to swing, the force application rod 400 moves upward again, the impact rod 105 is lifted upward again, and after disengagement, it repeatedly falls and impacts. By continuously swinging the rocker arm 501, the force bar 400 can be driven to move continuously, so as to cooperate with the elastic strip 401, the lifting ring 404 and the impact bar 105 to repeatedly complete the lifting, disengaging and falling impact process, thereby continuously applying intermittent impact force to the sampling tube 103 under relatively hard soil conditions, so that the sampling tube 103 can continue to be inserted.

[0081] Furthermore, as the sampling process proceeds, the sampling cylinder 103 is gradually inserted, and the working position of the impact rod 105 gradually decreases relative to the connecting rod 102. Since the outer wall of the force-applying rod 400 is provided with multiple elastic strips 401, multiple engaging cavities 405 are formed at different heights. Therefore, after the working position of the impact rod 105 decreases, the lifting ring 404 can still re-engage with the lower engaging cavity 405, allowing the force-applying rod 400 to continue driving the impact rod 105 upwards when it subsequently moves upwards, and then fall again to impact after disengagement. To ensure stable impact action, the rocker arm 501 preferably reaches a predetermined stroke each time it swings, so that the force-applying rod 400 obtains sufficient upward stroke, thereby ensuring that the lifting ring 404 can reliably engage with the engaging cavity 405 at the corresponding height position, and that the impact rod 105 is lifted to the predetermined release position. Compared to directly inserting the sampling cylinder 103 by applying continuous downward pressure, this embodiment uses a rocker arm 501 to form a lever force transmission structure, which facilitates continuous manual operation and maintains the continuity of the impact action during the continuous insertion of the sampling cylinder 103, thereby improving the sampling stability in harder soil layers.

[0082] If the rocker arm 501 does not swing to the correct position, the lifting ring 404 may not be able to be lifted to the predetermined release position, or may not be able to reliably engage with the corresponding locking cavity 405. This would result in the impact rod 105 being unable to effectively complete the lifting, disengaging, and falling impact process, thus affecting impact sampling.

[0083] In some embodiments, the impact mechanism 108 further includes a linkage rotating part 104, which is disposed between the connecting rod 102 and the connecting plate 403. The linkage rotating part 104 is used to rotate the connecting plate 403 by a predetermined angle when the force-applying rod 400 is pressed down to the end of its stroke, thereby changing the force-applying position of the impact rod 105. Specifically, a first gear 600 is connected to the inner wall of the connecting plate 403, a second gear 601 is rotatably connected to the connecting rod 102, and a third gear 602 is connected to the side wall of the connecting rod 102, meshing with both the first gear 600 and the second gear 601. A rotating sleeve 603 is provided inside the second gear 601, and the inner wall of the rotating sleeve 603 has a straight section 604 and a spiral section 605 communicating with the straight section 604. A pressure rod 606 is slidably connected inside the connecting rod 102, and a guide rod 607 that slidably engages with the straight section 604 is connected to the outer wall of the pressure rod 606. A second elastic member 608 is connected between the pressure rod 606 and the connecting rod 102. A ratchet mechanism 609 is provided between the rotating sleeve 603 and the second gear 601 so that the rotating sleeve 603 drives the second gear 601 to rotate in one direction when it rotates.

[0084] The pressure rod 606 is slidably connected to the connecting rod 102 along its length. Preferably, the pressure rod 606 is coaxially arranged with the connecting rod 102. The upper end of the pressure rod 606 is located on the downward stroke path of the force-applying rod 400, so that when the force-applying rod 400 moves down to the end of its stroke, it can abut against the upper end of the pressure rod 606 and push the pressure rod 606 downward along the length of the connecting rod 102. The second elastic element 608 is sleeved on the outside of the pressure rod 606, and one end of the second elastic element 608 is connected to the limiting platform on the inner wall of the connecting rod 102, and the other end is connected to the limiting platform on the pressure rod 606. This allows the pressure rod 606 to return to its original position along the connecting rod 102 under the elastic recovery action of the second elastic element 608 after being pressed down by the force-applying rod 400. The guide rod 607 is fixedly connected to the outer wall of the pressure rod 606 and extends outward into the helical section 605 opened in the inner wall of the rotating sleeve 603. In the initial state, the guide rod 607 is located in the straight section 604. When the force rod 400 moves down to the end of its stroke, its lower end abuts against the upper end of the pressure rod 606, and forces the pressure rod 606 to move downward along the length direction of the connecting rod 102. The guide rod 607 moves down synchronously with the pressure rod 606 and first slides along the straight section 604 to guide the initial downward trajectory of the pressure rod 606. When the pressure rod 606 continues to move down, the guide rod 607 enters the helical section 605, which is connected to the straight section 604, from the straight section 604. Since the helical section 605 extends circumferentially inclined relative to the rotating sleeve 603, the guide rod 607 will push against the side wall of the helical section 605 during the continued downward movement, thereby pushing the rotating sleeve 603 to rotate. After the rotating sleeve 603 rotates, it drives the second gear 601 to rotate through the ratchet mechanism 609. The second gear 601 then drives the first gear 600 and the connecting plate 403 to rotate synchronously through the third gear 602, thereby causing the position of the impact rod 105 relative to the connecting rod 102 to change in the circumferential direction.

[0085] After the force bar 400 returns to its original position, the pressure bar 606 loses its downward pressure. At this time, the second elastic element 608 releases its elastic potential energy and pushes the pressure bar 606 upward along the connecting rod 102. One end of the second elastic element 608 is connected to the pressure bar 606, and the other end is connected to the inner wall of the connecting rod 102 or a fixed part located within the connecting rod 102. As the pressure bar 606 moves upward, the guide rod 607 moves in the opposite direction along the spiral section 605 and returns to the straight section 604, thereby restoring the pressure bar 606 to its initial position. During this reverse reset process, although the guide rod 607 will drive the rotating sleeve 603 to rotate in the opposite direction, since the ratchet mechanism 609 only allows the rotating sleeve 603 to drive the second gear 601 to rotate in one direction, the rotating sleeve 603 rotates freely relative to the second gear 601 when it rotates in the opposite direction, and does not drive the second gear 601, the first gear 600, and the connecting plate 403 to rotate in the opposite direction. With the above structure, the connecting plate 403 can rotate unidirectionally once each time the force bar 400 is pressed down to the position, and maintain the existing rotation angle position during reset, thereby changing the force application position of the impact bar 105 successively.

[0086] By incorporating the linkage rotating part 104, the impact rod 105 can apply force to the sampling cylinder 103 at different circumferential positions during multiple impacts, avoiding long-term concentrated impacts on the same position and thus improving the uniformity of the impact. The straight segment 604 is used to define the initial position and downward trajectory of the guide rod 607, ensuring that the guide rod 607 moves steadily downwards before entering the spiral segment 605 to trigger the rotation action, thereby improving the stability of the linkage rotating part 104's operation.

[0087] Furthermore, in this embodiment, two impact rods 105 are provided, and the two impact rods 105 are symmetrically arranged relative to the axis of the connecting rod 102. By providing two impact rods 105 and distributing them symmetrically, the two impact rods 105 can act on different positions of the sampling cylinder 103 when falling, thereby forming a more balanced impact force state, reducing the unilateral force, eccentric loading, and tilting phenomenon of the sampling cylinder 103 during the insertion process, which is conducive to keeping the sampling cylinder 103 stably entering the soil layer in the predetermined direction. At the same time, compared with a single impact component, two impact rods 105 can achieve distributed force application while ensuring the concentration of impact force, so that the sampling cylinder 103 has good soil breaking ability during the insertion process, and is not prone to instability of the sampling cylinder 103 due to excessive local force. Furthermore, compared with a larger number of impact rods 105, the structure of two impact rods 105 is simpler, the impact force is not easily excessively dispersed, and the effectiveness of a single impact can be improved while ensuring the balance of force. Furthermore, the area between the two impact rods 105 that is not directly impacted is conducive to the local displacement and stress release of the soil layer after impact, thereby reducing the excessive compaction of the soil around the bottom of the sampling tube 103 and facilitating the entry of soil samples into the sampling tube 103.

[0088] In some other embodiments, the number of impact rods 105 can also be set to three, four, or more. However, compared to the two symmetrically arranged impact rods 105 in this embodiment, increasing the number of impact rods 105 increases the number of points of application, but the force distributed to each individual impact point will decrease accordingly, easily leading to the dispersion of impact force, which is not conducive to improving the effectiveness of a single impact. Furthermore, the more impact rods 105 there are, the more complex the structural arrangement becomes, the higher the assembly precision requirements are, and the more likely it is that different impact points will experience asynchronous force distribution during continuous impact. Therefore, compared to the scheme with a larger number of impact rods 105, the structure of two impact rods 105 in this embodiment is more conducive to ensuring concentrated impact force, structural simplification, and sampling stability.

[0089] In some other embodiments, the impact element may also employ an impact head structure, which can be annular, arc-shaped, polygonal, or other shapes, and is fitted onto the outer wall of the connecting rod 102. While this type of structure can also apply downward impact force to the sampling cylinder 103, compared to the two independently arranged impact rods 105 in this embodiment, the contact area of ​​the integral impact head is generally larger. Under the same force conditions, the resulting local pressure is relatively low, which is not conducive to concentrating the impact force onto the sampling cylinder 103. Especially when the soil layer is relatively dense or the sampling resistance is high, the integral impact head is more likely to disperse the force over a larger area, reducing the impact intensity per unit area and thus weakening the effective downward pressure effect on the sampling cylinder 103. Example 2

[0090] Another specific embodiment of the present invention discloses a method for remediating heavy metal soil pollution, comprising the following steps: Step S1: Using the soil sampling device for heavy metal soil pollution remediation in Example 1, in-situ soil samples are taken at a predetermined depth from multiple sampling points in the area to be remediated. Step S2: Analyze the extracted in-situ soil samples to obtain the spatial distribution of pollution, the main controlled heavy metals, and soil properties within the area to be treated. The spatial distribution of pollution can be determined using GIS technology combined with the coordinates of each sampling point and the corresponding pollution data, clearly defining the specific boundaries of high-pollution, medium-pollution, and low-pollution areas. Pollution levels can be classified using existing technologies, such as referring to relevant national standards. The main controlled heavy metals need to be determined through precise detection methods such as atomic absorption spectrometry and inductively coupled plasma mass spectrometry on in-situ soil samples, while simultaneously analyzing the concentration gradient changes of each heavy metal element. Soil property data, including key indicators such as soil pH, organic matter content, cation exchange capacity, and particle composition, provides fundamental data support for the development of subsequent remediation plans.

[0091] Step S3: Based on the spatial distribution of pollution, the main controlled heavy metals, and soil properties in the area to be treated, select an appropriate treatment plan that complies with relevant national standards / specifications, and carry out remediation of the heavy metal contaminated soil in the area to be treated.

[0092] It should be noted that, based on the spatial distribution of pollution, the main controlled heavy metals, and the soil properties within the area to be treated, existing heavy metal pollution treatment solutions can be adopted.

[0093] For example, for highly polluted areas, an ex-situ leaching-solidification stabilization combined process can be used to remediate and treat the soil in the highly polluted areas. Specifically, heavy metals in the soil are first efficiently extracted by a special leaching agent, and then solidifying agents such as lime and phosphate are added to the leached soil to make the residual heavy metals form a stable mineral form. For moderately polluted areas, in-situ chemical passivation technology is preferred for soil remediation. Specifically, passivation materials such as hydroxyapatite and biochar are evenly applied to the soil to reduce the bioavailability of heavy metals through adsorption, precipitation, and ion exchange. For low-pollution areas, phytoremediation is the primary method, supplemented by microbial enhancement technology to remediate and treat the soil in these areas. Specifically, phytoremediation is the main method, which involves selecting and planting hyperaccumulating plants such as Centipede Grass and Sedum aizoon to absorb and enrich heavy metals in the soil through their root systems. Microbial enhancement technology is used to improve the absorption efficiency and conversion capacity of plants for heavy metals by inoculating functional microorganisms.

[0094] During the remediation process, it is necessary to monitor changes in heavy metal concentrations and soil property indicators in the soil in real time, and dynamically adjust the remediation parameters based on the monitoring results to ensure that the remediation effect achieves the expected goals.

[0095] In step S1, in-situ soil samples are taken at a predetermined depth from multiple sampling points within the area to be treated. The specific steps are as follows: Step S11: Determine the sampling point location, target sampling layer and corresponding target sampling depth, and pre-drill holes at each sampling point. The depth of the pre-drill holes should not be deeper than the target sampling depth, and should be as close as possible to or even equal to the target sampling depth. Step S12: Install the sampling cylinder 103 at the bottom of the connecting rod 102, and separate the bottom cover 210 from the bottom of the sampling cylinder 103 so that the bottom of the sampling cylinder 103 remains open; then, place the tripod 100 above the corresponding sampling point so that the sampling cylinder 103 corresponds to the pre-drilled hole. Step S13: Use the linear drive 106 to drive the connecting bracket 101 and the connecting rod 102 to move downward, so that the sampling tube 103 is inserted downward along the pre-drilled hole and continues to enter the target sampling layer; Step S14: During the insertion of the sampling tube 103, when the sampling tube 103 can continue to descend, the connecting bracket 101 and the connecting rod 102 are kept displaced downwards so that the sampling tube 103 continues to be pressed into the soil layer; when the sampling tube 103 encounters a harder soil layer or the insertion resistance increases, the impact mechanism 108 is driven to work, so that the impact rod 105 is displaced up and down intermittently, and an intermittent impact force is applied to the sampling tube 103 so that the sampling tube 103 continues to be inserted into the target sampling layer. Step S15: After the sampling tube 103 is inserted into the target sampling layer, the target soil layer enters the sampling tube 103 and pushes the push plate 202 upward; when the push plate 202 moves upward to the predetermined position, the limiting block 208 on the limiting shaft 207 disengages from the straight opening 206, and the first elastic element 209 drives the rotating blade 201 to rotate, so as to cut the connection between the target soil sample and the lower continuous soil. Step S16: After the cutting is completed, the connecting bracket 101 and the connecting rod 102 are driven to move upward using the linear drive component 106, so that the sampling tube 103 and the soil sample inside are pulled out of the pre-drilled hole as a whole. Step S17: After the sampling tube 103 leaves the pre-drilled hole, the bottom cover 210 is fastened to the bottom of the sampling tube 103 to complete the in-situ soil sampling at the predetermined depth.

[0096] Repeat the above steps to complete in-situ soil sampling at the predetermined depth for all sampling points.

[0097] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this application. It should be understood that the above are only specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for remediating heavy metal soil pollution, characterized in that, Includes the following steps: Step S1: Use a soil sampling device for heavy metal soil pollution remediation to collect in-situ soil samples at a predetermined depth from multiple sampling points in the area to be remediated. Step S2: Analyze the extracted in-situ soil samples to obtain the spatial distribution of pollution, the main controlled heavy metals, and soil properties within the area to be treated. Step S3: Based on the spatial distribution of pollution, the main controlled heavy metals, and the soil properties in the area to be treated, select an appropriate treatment plan and carry out remediation of the heavy metal contaminated soil in the area to be treated.

2. The method for remediating heavy metal soil pollution according to claim 1, characterized in that, The spatial distribution of pollution was determined by combining the coordinates of each sampling point and the corresponding pollution data using GIS technology, thus clarifying the specific ranges of high-pollution areas, medium-pollution areas and low-pollution areas. And / or, The main controlled heavy metal species were determined by testing in-situ soil samples using atomic absorption spectrometry and inductively coupled plasma mass spectrometry. And / or, The soil property data includes soil pH, organic matter content, cation exchange capacity, and particle composition data.

3. The method for remediating heavy metal soil pollution according to claim 2, characterized in that, In step S3, the governance measures adopted include: For highly polluted areas, an ex-situ leaching-solidification stabilization combined process is used to remediate and treat the soil in the highly polluted areas; For moderately polluted areas, in-situ chemical passivation technology is used to remediate and treat the soil in the moderately polluted areas; For low-pollution areas, phytoremediation is the primary method, supplemented by microbial enhancement technology, to remediate and treat the soil in these areas.

4. A soil sampling device for heavy metal soil pollution remediation, characterized in that, include: Tripod (100), the top of which is provided with a connecting bracket (101); A connecting rod (102) is connected to the connecting bracket (101) and extends downward through the tripod (100) to the bottom of the tripod (100); The sampling tube (103), detachably connected to the bottom of the connecting rod (102), is configured to contain the target soil sample; A connecting groove (200) is formed on the inner wall of the sampling cylinder (103), and a rotating blade (201) is provided in the connecting groove (200). A rotary drive mechanism (107) is located between the sampling tube (103) and the rotary blade (201) to drive the rotary blade (201) to rotate when the soil in the sampling tube (103) reaches a predetermined amount, so as to cut the connection between the target soil sample and the lower continuous soil.

5. The soil sampling device for heavy metal soil pollution remediation according to claim 4, characterized in that, The rotary drive mechanism (107) includes a push plate (202) disposed inside the sampling cylinder (103). A connecting strip (203) is connected to the top of the push plate (202). The connecting strip (203) extends upward to the top of the sampling cylinder (103) and is connected to a connecting frame (204). A first connecting cylinder (205) is connected to the top of the rotary blade (201). A straight opening (206) is provided on the inner wall of the first connecting cylinder (205). A limiting shaft (207) is connected to the bottom of the connecting frame (204). A limiting block (208) is connected to the limiting shaft (207). The limiting shaft (207) extends downward into the first connecting cylinder (205). The limiting block (208) slides within the straight opening (206). A first elastic element (209) is connected between the first connecting cylinder (205) and the sampling cylinder (103).

6. The soil sampling device for heavy metal soil pollution remediation according to claim 5, characterized in that, The bottom of the sampling tube (103) is provided with a bottom cover (210). The outer wall of the sampling tube (103) is provided with a receiving groove (211). A sliding strip (212) is slidably connected in the receiving groove (211). The outer wall of the first connecting tube (205) is fixed with a second connecting tube (213). The outer wall of the second connecting tube (213) is provided with a spiral opening (214). A push block (215) is connected on the sliding strip (212). The push block (215) is slidably engaged with the spiral opening (214).

7. The soil sampling device for heavy metal soil pollution remediation according to claim 4, characterized in that, The outer wall of the connecting rod (102) is provided with two impact rods (105), and an impact mechanism (108) is provided between the connecting bracket (101) and the impact rods (105) for driving the impact rods (105) to move up and down intermittently and apply force to the sampling cylinder (103); Preferably, the impact mechanism (108) includes a force-applying rod (400) slidably connected to the connecting rod (102), the outer wall of the force-applying rod (400) is connected with a plurality of elastic strips (401), the outer wall of the connecting rod (102) is provided with a sliding channel (402), the elastic strips (401) extend into the sliding channel (402), the connecting rod (102) is provided with a connecting plate (403), and the impact rod (105) is slidably connected to the connecting plate (403); Preferably, a lifting ring (404) is connected to the top of the impact rod (105), and a snap-fit ​​cavity (405) is formed between every two adjacent elastic strips (401), the height of the snap-fit ​​cavity (405) being greater than the thickness of the lifting ring (404).

8. The soil sampling device for heavy metal soil pollution remediation according to claim 7, characterized in that, The impact mechanism (108) further includes a support frame (500) connected to the connecting bracket (101), a rocker arm (501) is rotatably connected to the support frame (500), a connecting platform (502) is connected to the top of the force application rod (400), a sleeve (503) is rotatably connected inside the connecting platform (502), and the rocker arm (501) and the sleeve (503) are in sliding engagement.

9. The soil sampling device for heavy metal soil pollution remediation according to claim 7, characterized in that, The impact rod (105) is also provided with an elastic energy storage component located below the connecting plate (403). The elastic energy storage component includes a first connecting ring (406) fixed to the outer wall of the impact rod (105). A second connecting ring (407) is provided at the top of the first connecting ring (406). A second elastic component (408) is connected between the first connecting ring (406) and the second connecting ring (407). A limit strip (409) is connected to the top of the first connecting ring (406).

10. The soil sampling device for heavy metal soil pollution remediation according to claim 7, characterized in that, The impact mechanism (108) also includes a linkage rotating part (104), which is disposed between the connecting rod (102) and the connecting plate (403) and is used to drive the connecting plate (403) to rotate a predetermined angle when the force rod (400) moves downward to a predetermined position.

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