A sampling device for remediation of heavy metal contaminated soil

Abstract

The application provides a sampling device for repairing heavy metal contaminated soil, and relates to the technical field of soil sampling, which comprises a sampling cylinder; further comprises a pressing mechanism, the pressing mechanism comprises a sleeve, four groups of air inlet pipes are communicated with the outer side wall of the sleeve, two groups of first sliding cavities and two groups of second sliding cavities are formed in the sleeve, the two groups of first sliding cavities are symmetrical, the two groups of second sliding cavities are symmetrical, two groups of first guide grooves and two groups of second guide grooves are further formed in the sleeve, and the first guide groove and the second guide groove are communicated through a communication groove; further comprises a pressure relief mechanism, the pressure relief mechanism is provided with four groups, comprising a fixed cylinder, the fixed cylinder is fixedly connected with the upper end face of the sleeve, a plurality of sliding grooves are formed in the surface of the fixed cylinder, a sealing ring and a plurality of annular springs are arranged on the inner side of the fixed cylinder, the application adopts the design that an air compressor supplies air to drive the alternate reciprocating movement of double pressure plates, and the working mode of traditional soil sampling relying on manual force is changed.

Description

Technical Field

[0001] This invention relates to the field of soil sampling technology, and more specifically, to a sampling device for remediating soil contaminated with heavy metals. Background Technology

[0002] Heavy metal contaminated soil sampling devices are key technical equipment for environmental monitoring, pollution investigation, and soil remediation effectiveness assessment. They are widely used in areas such as industrial and mining site investigation, farmland soil environmental monitoring, urban brownfield redevelopment assessment, and soil remediation project acceptance. Their sampling quality and efficiency directly affect the accuracy of pollution level assessment, the scientific nature of remediation plan design, and the reliability of remediation effect verification. They are of great significance for promoting soil pollution prevention and control, ensuring agricultural product quality and safety, and promoting ecological environmental protection. During the implementation of heavy metal contaminated soil remediation projects, it is necessary to collect a large number of soil samples from different locations within the contaminated site according to a grid-based sampling plan or a sampling scheme with increased density in key areas. By analyzing the content distribution and pollution level of heavy metal elements such as lead, cadmium, mercury, arsenic, and chromium through laboratory testing, this study provides basic data support for delineating the pollution range, identifying pollution sources, selecting remediation technologies, and evaluating remediation effectiveness. Because heavy metal contaminated soils often have complex characteristics such as heavy and compacted texture, large variations in moisture content, mixed gravel and debris, and uneven distribution of pollutants, sampling operations require that the sampler can successfully penetrate the compacted soil layer to reach the target depth and obtain representative samples. At the same time, the sampling process must not damage the original soil structure and the state of pollutant occurrence to avoid sample disturbance and cross-contamination. In addition, it must meet the high efficiency requirements of large-scale, multi-point, continuous sampling to shorten the field investigation cycle and reduce sampling costs.

[0003] However, the soil sampling devices commonly used in practical applications such as heavy metal contaminated soil investigation, monitoring, and remediation project acceptance suffer from inconvenient operation designs, hindering efficiency improvements and reducing labor intensity. While existing soil sampling devices can complete basic soil sample collection, their driving methods are too primitive and reliant on manual labor. They typically employ manual rotation or foot pressure to drive the sampler into the soil. Operators must grip the sampler handle tightly with both hands, press down forcefully, and rotate repeatedly, or use their feet to step on the top platform of the sampler, applying pressure with their body weight. They rely on muscle strength to overcome soil resistance and gradually push the sampling tube into the ground to the sampling depth. While this manual sampling method offers simple equipment and low cost, it reveals drawbacks such as high labor intensity and low efficiency in practical applications. Firstly, heavy metal contaminated soil is often hard and dense due to long-term trampling and compaction, especially clayey soils which are harder under dry conditions. Manual pressing or foot pressure makes it difficult to successfully drive the sampler into deeper soil layers. In the case of soil contamination, operators often need to expend considerable physical effort to collect samples from a single sampling point. When dozens or even hundreds of soil samples need to be collected at contaminated sites, the continuous high-intensity physical labor can easily lead to operator fatigue and occupational injuries such as muscle strains and lumbar spine injuries. This not only affects the health and work enthusiasm of the operators but also causes inaccurate control of sampling depth and a decline in sample quality due to fatigue. Secondly, manual or foot-operated sampling methods are inefficient. Completing a single sampling point, from pressing in and taking the sample to pulling it out and cleaning it, often takes more than ten minutes. For investigation tasks involving hundreds of sampling points in large-scale contaminated sites, it requires multiple people to work continuously for several days to complete the task. This not only prolongs the field investigation cycle and increases labor costs and travel expenses but may also lead to weather changes affecting the consistency of sampling conditions and the representativeness of samples due to the excessively long sampling cycle. Therefore, there is an urgent need to develop a new type of heavy metal contaminated soil sampling device technology that can reduce the intensity of manual labor, improve sampling efficiency, and achieve labor-saving and convenient operation to meet the actual needs of rapid and efficient sampling in large-scale soil pollution investigations and remediation projects. Summary of the Invention

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a sampling device for remediating heavy metal contaminated soil, so as to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A sampling device for remediating heavy metal contaminated soil includes a sampling tube; it also includes a pressing mechanism, which includes a sleeve with four sets of air inlet pipes connected to its outer wall. The sleeve contains two sets of first sliding cavities and two sets of second sliding cavities, the first and second sets being symmetrical. The sleeve also contains two sets of first guide grooves and two sets of second guide grooves, which are connected by a connecting groove. The device further includes a pressure relief mechanism, which has four sets, including a fixed cylinder fixedly connected to the upper end face of the sleeve. The surface of the fixed cylinder has multiple sets of sliding grooves. The inner side of the fixed cylinder has a sealing ring and multiple sets of annular springs, the annular springs being located above the sealing ring. A limiting ring is provided at the bottom of the fixed cylinder.

[0006] Preferably, a circular plate is connected to the upper end face of the sampling cylinder, and two sets of vertical rods are provided on the upper end face of the circular plate. Two sets of third guide grooves adapted to the vertical rods are opened at both ends of the sleeve, and the vertical rods are inserted into the third guide grooves and slidably connected with the third guide grooves.

[0007] Preferably, a handle is connected to the other end of the two sets of vertical rods, and a connecting spring is sleeved on the outside of the two sets of vertical rods. One end of the connecting spring is fixedly connected to the lower end face of the handle, and the other end is fixedly connected to the upper end face of the sleeve.

[0008] Preferably, a first pressure rod is slidably connected within the two sets of first sliding cavities, a first tension spring is connected to the upper end face of the first pressure rod, a first pressure plate is connected to the lower end face of the two sets of first pressure rods, and two sets of first guide rods are provided on the upper end face of the first pressure plate, with the first guide rods slidably connected to the corresponding first guide grooves.

[0009] Preferably, two sets of second sliding cavities are slidably connected with second pressure rods, the upper end face of the second pressure rods is connected with a second tension spring, the lower end face of the two sets of second pressure rods is connected with a second pressure plate, the upper end face of the second pressure plate is provided with two sets of second guide rods, and the second guide rods are slidably connected with corresponding second guide grooves.

[0010] Preferably, the sleeve has multiple sets of air inlet grooves, the air inlet pipe is connected to two adjacent sets of the first sliding cavity and the second sliding cavity through the air inlet grooves, and the side wall of the air inlet groove is also provided with a side groove.

[0011] Preferably, a bidirectional rod is slidably connected inside the air intake groove, a blocking ring is sleeved on the surface of the bidirectional rod, a blocking spring is sleeved at both ends of the blocking ring, and the other end of the blocking spring is fixedly connected to the inner side wall of the sleeve.

[0012] Preferably, the inner side of the fixed cylinder is provided with an intermediate disk coaxially, the outer wall of the intermediate disk is provided with multiple sets of connecting rods, the connecting rods are slidably connected to the slide groove, the outer wall of the fixed cylinder is slidably connected with a push ring, and the push ring is fixedly connected to the other end of the connecting rod.

[0013] Preferably, the outer wall of the fixed cylinder is threaded with a threaded sleeve, the upper end face of the threaded sleeve is connected with a push spring, and a thrust bearing is provided between the push ring and the push spring.

[0014] Preferably, a slide rod is connected inside the intermediate plate, and a retaining ball is provided at the center of the slide rod. The retaining ball abuts against the side wall of the annular spring. A sealing disc adapted to the sealing ring is provided on the lower end face of the slide rod. The sealing disc abuts against the sealing ring in a sealing manner. A connecting rod is provided on the lower end face of the sealing disc. The connecting rod is slidably connected to the limiting ring. The lower end faces of the four sets of connecting rods are respectively fixedly connected to the top of the corresponding first tension spring or second tension spring.

[0015] (III) Beneficial Effects Compared with existing technologies, the present invention provides a sampling device for remediating heavy metal contaminated soil, which has the following beneficial effects: This invention employs an air compressor-driven design that alternatingly reciprocates the motion of two pressure plates, changing the traditional method of soil sampling that relies on manual force. Operators simply hold the handle, align the sampling tube with the target location, and start the air compressor. High-pressure gas is alternately injected into the sliding cavity through the air inlet pipe, driving the pressure rod and causing the pressure plates to move up and down in a regular reciprocating motion. Each downward press applies strong pressure to the sampling tube, gradually pushing it through the soil layer. The entire sampling process eliminates the need for operators to expend physical effort repeatedly pressing or stepping; simply holding the handle for stability is sufficient to collect deep soil samples. This method, which uses compressed air power instead of human muscle strength, reduces the intensity of labor and avoids occupational health problems such as arm pain and lumbar spine injuries caused by prolonged high-intensity labor. Even when facing hard, dense soil contaminated with heavy metals or large-scale surveys requiring the continuous completion of dozens of sampling points, a single person can complete the work without significant fatigue, effectively protecting the health of workers and improving work comfort.

[0016] This device utilizes a linkage mechanism involving a bidirectional rod blocking ring switching air path and a gas mutual pressure transmission through a guide groove. This mechanism enables a continuous cyclical working mode where two sets of pressure plates alternately reciprocate up and down. When the top of one pressure rod presses against the bidirectional rod, causing the blocking ring to slide and block the air inlet groove on the other side, high-pressure gas enters the corresponding sliding cavity through the side groove, driving the pressure rod downward. Simultaneously, the guide rod moves downward, pressing the gas in the guide groove through the connecting groove into the other guide groove, pushing the opposite guide rod upward. This achieves the alternating motion of the two pressure plates, which has the significant advantages of smooth and continuous operation and precise and reliable switching. The two pressure plates alternately apply downward pressure to the sampling cylinder, ensuring a continuous and stable output of pressing power. This avoids the problem of the sampling cylinder rising under the action of soil rebound force during the upward stroke of a single pressure plate reciprocating motion, where there is no downward pressure. The alternating downward pressing method ensures that at any given time, at least one pressure plate is applying pressure to the sampling cylinder, maintaining a downward pushing trend. This significantly improves the stability of the sampling process and the accuracy of sampling depth control, ensuring that the device can successfully penetrate compacted soil layers and gravel layers to reach the target depth and obtain representative soil samples.

[0017] The pressure relief mechanism designed in this device releases high-pressure gas from the sliding cavity by stretching a tension spring to release the sealing disc from the sealing ring. This achieves a timed pressure relief function for the corresponding sliding cavity when the pressure disc reaches the end of its downward stroke. When the pressure disc moves down to the position where it presses against the top surface of the sampling cylinder, the tension spring is stretched to its maximum state, and the resulting tension overcomes the sum of the opposing elastic forces of the ring spring and the push spring, pulling the connecting rod down. The connecting rod drives the sliding rod and the sealing disc to move down synchronously, creating a pressure relief gap between the sealing disc and the sealing ring. At this time, the retaining ball is pulled to the underside of the ring spring, changing the ring spring's upward thrust to downward pressure, further ensuring that the pressure relief channel remains open. The high-pressure gas in the sliding cavity is quickly discharged, restoring normal pressure. When the pressure disc... When moved to the highest position, the tension spring rebounds to its minimum tension state. At this time, the thrust of the push spring overcomes the tension of the ring spring and the tension spring, pushing the push ring to drive the connecting rod and the intermediate plate to move upward. This, in turn, drives the slide rod and the locking ball to move upward synchronously, causing the locking ball to move to the upper side of the ring spring again. The corresponding sealing plate also achieves a sealing contact state with the sealing ring again, completing the sealing reset. This intelligent pressure relief mechanism does not require manual operation. It relies on the design of the mechanical structure and the balance of spring force to achieve pressure relief and reset. It ensures that the slide cavity is depressurized in time after each pressure plate completes its downward stroke to prepare for the next cycle. It avoids residual air pressure affecting the reset speed and stroke of the pressure rod, and ensures the continuity and rhythm of the alternating reciprocating motion of the two pressure plates.

[0018] This device employs a gas path switching mechanism composed of a bidirectional rod and a blocking ring. The airflow direction is switched by mechanically squeezing the bidirectional rod at the top of the pressure rod. When one side of the pressure rod reaches its highest position, its top squeezes the bidirectional rod, causing the blocking ring to slide and block the opening of the opposite air inlet slot. At this time, high-pressure gas can only enter the side sliding cavity through the side slot, driving the pressure rod on that side to move downwards. Simultaneously, the opposite side pressure rod moves upwards to its highest position and then squeezes the bidirectional rod again, causing the blocking ring to slide in the opposite direction to switch the gas path direction. The blocking springs on both sides of the blocking ring are compressed and stretched simultaneously, maintaining the blocking ring's stability and blocking the corresponding side air inlet slot port under the action of high-pressure gas, ensuring the reliability of the gas path switching. This device utilizes a closed gas transmission system composed of guide slots and connecting slots. The design of one side's guide rod compressing the gas in the guide slot and pushing the other side's guide rod through the connecting slot achieves synchronous reverse movement of the two sets of pressure plates. When one set of guide rods moves upwards, the gas in its guide slot is forced through the connecting slot into the other set of guide slots, pushing the other set of guide rods downwards, and vice versa, forming a linkage relationship between the two sets of guide rods moving up and down.

[0019] This device utilizes a threaded sleeve connected to a fixed cylinder with a compression spring, providing convenient adjustment for the pressure relief mechanism. Operators can adjust the compression of the spring by rotating the threaded sleeve according to actual operating conditions such as air compressor supply pressure, soil hardness, and sampling depth. This alters the spring's preload on the push ring, allowing for adjustment of the pressure relief trigger timing and sealing reset force. The device also features a connecting spring on the outside of the vertical rod, connecting the handle and sleeve. This design provides elastic buffering for the entire sampling device. As the pressure plate reciprocates and presses down on the sampling cylinder, the entire sampling device moves synchronously with the cylinder. The sleeve slides up and down along the vertical rod, and the connecting spring bounces up and down with the pressure plate's reciprocating motion. This effectively absorbs and buffers the impact and vibration generated when the pressure plate presses down, preventing severe vibrations from being transmitted to the operator through the handle and causing hand discomfort. Simultaneously, the upward elastic force provided by the connecting spring partially offsets the weight of the entire device, reducing the burden on the operator's hands and making long-term operation easier and more comfortable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a sampling device for remediating heavy metal contaminated soil according to the present invention; Figure 2 This is a schematic diagram of the sampling cylinder and vertical rod in this invention; Figure 3 This is a schematic diagram of the sleeve and fixed sleeve in this invention; Figure 4 This is a cross-sectional view of the first pressure rod and the second guide rod in this invention. Figure 5 This is a cross-sectional view of the second pressure rod and the first guide rod in this invention. Figure 6This is a schematic diagram of the sleeve and air inlet pipe in this invention; Figure 7 This is a cross-sectional view of the sleeve in this invention; Figure 8 This is a cross-sectional view of the sleeve and air inlet pipe in this invention. Figure 9 This is a cross-sectional view of the sleeve and the bidirectional rod in this invention. Figure 10 This is a schematic diagram of the bidirectional rod and the barrier ring in this invention; Figure 11 This is a schematic diagram of the structure of the first pressure plate and the first pressure rod in this invention; Figure 12 This is a schematic diagram of the structure of the second pressure plate and the second pressure rod in this invention; Figure 13 This is a schematic diagram of the pressure relief mechanism in this invention; Figure 14 In this invention Figure 13 A cross-sectional structural diagram.

[0021] In the diagram: 11. Sampling cylinder; 12. Circular plate; 13. Vertical rod; 14. Handle; 15. Connecting spring; 21. Sleeve; 22. Air inlet pipe; 23. First sliding cavity; 24. Second sliding cavity; 25. First guide groove; 26. Second guide groove; 27. Connecting groove; 28. Third guide groove; 29. ​​First pressure rod; 31. Fixed cylinder; 32. Sliding groove; 33. Sealing ring; 34. Circular spring; 35. Limiting ring; 36. Intermediate plate; 37. Connecting rod; 38. Push 39. Ring; 210. Threaded sleeve; 211. First tension spring; 212. First pressure plate; 213. First guide rod; 214. Second pressure rod; 215. Second tension spring; 216. Second pressure plate; 217. Second guide rod; 218. Air inlet groove; 219. Side groove; 220. Two-way rod; 221. Barrier ring; 222. Barrier spring; 310. Push spring; 311. Thrust bearing; 312. Slide rod; 313. Ball catcher; 314. Sealing plate; 315. Connecting rod. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0025] Please see Figures 1-14 A sampling device for remediating heavy metal contaminated soil includes a sampling cylinder 11, a circular plate 12 connected to the upper end of the sampling cylinder 11, two sets of vertical rods 13 on the upper end of the circular plate 12, and two sets of third guide grooves 28 adapted to the vertical rods 13 at both ends of a sleeve 21. The vertical rods 13 are inserted into and slidably connected to the third guide grooves 28. A handle 14 is connected to the other end of the two sets of vertical rods 13, and a connecting spring 15 is sleeved on the outside of the two sets of vertical rods 13. One end of the connecting spring 15 is fixedly connected to the lower end of the handle 14, and the other end is connected to the sleeve 14. The upper end face of the cylinder 21 is fixedly connected; it also includes a pressing mechanism, which includes a sleeve 21. The outer wall of the sleeve 21 is connected to four sets of air inlet pipes 22. Two sets of first sliding cavities 23 and two sets of second sliding cavities 24 are formed inside the sleeve 21. The two sets of first sliding cavities 23 are symmetrical, and the two sets of second sliding cavities 24 are symmetrical. Two sets of first guide grooves 25 and two sets of second guide grooves 26 are also provided inside the sleeve 21. The first guide grooves 25 and the second guide grooves 26 are connected through a connecting groove 27. A first pressure rod 29 is slidably connected inside the two sets of first sliding cavities 23. A first tension spring 210 is connected to the upper end face of a pressure rod 29. A first pressure plate 211 is connected to the lower end face of two sets of first pressure rods 29. Two sets of first guide rods 212 are provided on the upper end face of the first pressure plate 211. The first guide rods 212 are slidably connected to the corresponding first guide grooves 25. A second pressure rod 213 is slidably connected in two sets of second sliding cavities 24. A second tension spring 214 is connected to the upper end face of the second pressure rod 213. A second pressure plate 215 is connected to the lower end face of the two sets of second pressure rods 213. Two sets of second guide rods 21 are provided on the upper end face of the second pressure plate 215. 6. The second guide rod 216 is slidably connected to the corresponding second guide groove 26. Multiple sets of air inlet grooves 217 are opened inside the sleeve 21. The air inlet pipe 22 is connected to the two adjacent sets of first sliding cavities 23 and second sliding cavities 24 through the air inlet grooves 217. The side wall of the air inlet groove 217 is also provided with a side groove 218. A bidirectional rod 219 is slidably connected inside the air inlet groove 217. A blocking ring 220 is sleeved on the surface of the bidirectional rod 219. A blocking spring 221 is sleeved on both ends of the blocking ring 220. The other end of the blocking spring 221 is fixedly connected to the inner side wall of the sleeve 21. It also includes a pressure relief mechanism, which has four sets, including a fixed cylinder 31, which is fixedly connected to the upper end face of the sleeve 21. Multiple sets of sliding grooves 32 are formed on the surface of the fixed cylinder 31. A sealing ring 33 and multiple sets of annular springs 34 are provided inside the fixed cylinder 31, with the annular springs 34 located above the sealing ring 33. A limiting ring 35 is provided at the bottom inner end of the fixed cylinder 31. A middle disk 36 is coaxially provided inside the fixed cylinder 31. Multiple sets of connecting rods 37 are provided on the outer wall of the middle disk 36, and the connecting rods 37 are slidably connected to the sliding grooves 32. A push ring 38 is slidably connected to the outer wall of the fixed cylinder 31, and the push ring 38 is fixedly connected to the other end of the connecting rod 37. The outer wall of the fixed cylinder 31 is threaded... The threaded connection is provided with a threaded sleeve 39, and a push spring 310 is connected to the upper end face of the threaded sleeve 39. A thrust bearing 311 is provided between the push ring 38 and the push spring 310. A slide rod 312 is connected inside the intermediate disk 36. A retaining ball 313 is provided at the center of the slide rod 312. The retaining ball 313 abuts against the side wall of the annular spring 34. A sealing disc 314 that is adapted to the sealing ring 33 is provided on the lower end face of the slide rod 312. The sealing disc 314 and the sealing ring 33 are sealed and abut against each other. A connecting rod 315 is provided on the lower end face of the sealing disc 314. The connecting rod 315 is slidably connected to the limiting ring 35. The lower end faces of the four sets of connecting rods 315 are respectively fixedly connected to the top of the corresponding first tension spring 210 or second tension spring 214.

[0026] In this invention, the device only requires manual operation by holding the handle 14 to align the sampling cylinder 11 with the sampling position. The sampling cylinder 11 is pressed downwards by the cyclical reciprocating motion of the first pressure plate 211 and the second pressure plate 215. As the first pressure plate 211 moves upwards, the second pressure plate 215 moves downwards; as the second pressure plate 215 moves downwards, the first pressure plate 211 moves upwards, gradually inserting the sampling cylinder 11 into the soil. Soil sampling can be completed effortlessly. Specifically, the connecting groove 27 and the connecting first guide groove 25 and second guide groove 26 are both filled with gas. When the two sets of first... When the guide rod 212 moves upward, the first guide rod 212 pushes the gas in the first guide groove 25 into the second guide groove 26 through the connecting groove 27, thereby causing the second guide rod 216 to move downward. When the second guide rod 216 moves upward, it pushes the gas in the second guide groove 26 into the first guide groove 25 through the connecting groove 27, thereby causing the first guide rod 212 to move downward. In this way, when the two sets of first guide rods 212 move downward, the two sets of second guide rods 216 move upward, and when the two sets of second guide rods 216 move downward, the two sets of first guide rods 212 move upward.

[0027] Four sets of air inlet pipes 22 are connected to an external air compressor. The operator holds handle 14 and moves the device to the sampling position, aligning the sampling cylinder 11 with the target location. Then, the air compressor is started. As shown in the diagram, the first pressure plate 211 moves downwards, and the second pressure plate 215 moves upwards. In this state, the air compressor inputs high-pressure gas into the air inlet pipes 22. At this time, the baffle plate prevents the high-pressure gas from flowing to the second pressure rod 213. The gas enters the first sliding cavity 23 through the side groove 218 opened on the side of the air inlet slot 217, driving the first... The pressure rod 29 continues to move downwards until the first pressure plate 211 below the first pressure rod 29 presses against the upper end face of the sampling cylinder 11. The first guide rod 212 moves downwards accordingly. At this time, the first tension spring 210 is stretched to its maximum. The corresponding ball 313 on one side of the first tension spring 210 is pulled to the lower side of the ring spring 34. The sealing plate 314 releases its sealing contact with the sealing ring 33. The high-pressure gas in the first sliding cavity 23 begins to be discharged through the gap between the sealing plate 314 and the sealing ring 33, and the pressure begins to be released. At this time, the pressure in the first sliding cavity 23 becomes normal.

[0028] Simultaneously, the second pressure rods 213 on both sides gradually move upward until their tops compress the ends of the corresponding bidirectional rods 219. The four sets of bidirectional rods 219 slide within the air inlet grooves 217 under pressure, causing them to slide towards the first pressure rod 29 until the blocking ring 220 blocks the air inlet groove 217 on one side of the first pressure rod 29. At this point, high-pressure gas enters the second sliding cavity 24 through the side groove 218 opened on the side of the air inlet groove 217 on one side of the second pressure rod 213, compressing the second pressure rod 213. The second pressure rod 213 then begins to drive the second pressure plate 215 to move downward synchronously, and the two sets of second guide rods 216 also move downward accordingly. As the sample moves downward, the second tension spring is stretched. During the downward movement of the two sets of second guide rods 216, the two sets of first guide rods 212 are driven to move upward. The first guide rods 212 drive the first pressure plate 211 and the first pressure rod 29 to move upward synchronously until the second pressure plate 215 presses against the upper end face of the sampling cylinder 11. At this time, the second tension spring is stretched to its maximum. The corresponding ball 313 on one side of the second tension spring is pulled to the lower side of the annular spring 34. The sealing plate 314 releases its sealing contact with the sealing ring 33. The high-pressure gas in the second sliding cavity 24 is discharged through the gap between the sealing plate 314 and the sealing ring 33, and the pressure begins to be released. The pressure in the second sliding cavity 24 becomes normal.

[0029] Synchronously, as the first pressure rod 29 moves upward, the first tension spring 210 gradually rebounds. When the second pressure rod 213 moves to its lowest point, the first pressure rod 29 also moves to its highest point. At this time, the sealing disc 314 and the sealing ring 33 on the corresponding side re-establish a sealing contact. At this time, the top of the first pressure rod 29 compresses the ends of the four sets of bidirectional rods 219. The four sets of bidirectional rods 219 begin to slide towards the second pressure rod 213 under pressure until the blocking ring 220 blocks the air inlet groove 217 on the side of the second pressure rod 213. At this time, high-pressure gas can only be filled into the first sliding cavity 23. The high-pressure gas compresses the first pressure rod 29, causing the first pressure rod 29 to move downward. The first tension spring 210 begins to be stretched. The first pressure rod 29 drives the first pressure disc 211 and the first guide rod 212 to move downward synchronously. The downward movement of the first guide rod 212 drives the second guide rod 216 to move upward. The second guide rod 216 drives the second pressure plate 215 and the second pressure rod 213 to move upward synchronously until the first pressure plate 211 presses against the upper end face of the sampling cylinder 11. At this time, the first tension spring 210 is stretched to the maximum. The first tension spring 210 drives the corresponding side sealing plate 314 to release the seal and abut against the sealing ring 33, and starts the pressure relief operation. The second tension spring side sealing plate 314 and sealing ring 33 seal and abut against each other. The top of the second pressure rod 213 starts to squeeze the bidirectional rod 219 synchronously, and the high pressure gas starts to flow into the second sliding cavity 24, thereby realizing the reciprocating movement of the first pressure plate 211 and the second pressure plate 215. When the bidirectional rod 219 moves, the barrier springs 221 on both sides of the barrier ring 220 are compressed and stretched at the same time. Under the action of high pressure gas, the barrier ring 220 will always block the port of the corresponding side air inlet groove 217. In the pressure relief mechanism, the spring force provided by the push spring 310 is greater than that provided by the ring spring 34. During the reciprocating motion of the first pressure plate 211 and the second pressure plate 215, taking the first tension spring 210 as an example, when the first pressure plate 211 presses down to the upper end face of the sampling cylinder 11, the first tension spring 210 is stretched to its maximum. At this time, the tension of the first tension spring 210 overcomes the sum of the spring forces of the ring spring 34 and the push spring 310, pulling the connecting rod 315 downward, causing the sealing plate 314 to release from the sealing contact state with the sealing ring 33, and the ball 313 is pulled to the lower side of the ring spring 34. At this time, the ring spring 34 changes from providing an upward thrust to the ball 313 to providing a downward thrust to the ball 313. At this time, the pressure relief operation begins in the first sliding cavity 23. When the pressure plate 211 moves to its highest position, the first tension spring 210 rebounds to its minimum tension state. At this time, the thrust of the push spring 310 overcomes the tension of the annular spring 34 and the first tension spring 210. The push spring 310 pushes the push ring 38 through the thrust bearing 311, causing the connecting rod 37 and the intermediate plate 36 to move upward, which in turn causes the slide rod 312 and the retaining ball 313 to move upward synchronously. The retaining ball 313 moves again to the upper side of the annular spring 34, and the corresponding sealing plate 314 also achieves a sealing contact with the sealing ring 33 again. The pressure relief work is completed. The first pressure plate 211 and the second pressure plate 215 reciprocate up and down to complete the pressure relief work through the pressure relief mechanism. The compression of the push spring 310 can be adjusted by rotating the threaded sleeve 39, thereby adjusting the thrust on the push ring 38.

[0030] The first pressure plate 211 and the second pressure plate 215 move up and down repeatedly to press the sampling cylinder 11 downwards. During the entire process, the entire sampling device moves down synchronously with the sampling cylinder 11, and the sleeve 21 slides up and down along the vertical plate. As a result, the connecting spring 15 bounces up and down with the reciprocating motion of the first pressure plate 211 and the second pressure plate 215, so that the sampling work can be completed without manual or foot pressing.

[0031] In all the solutions mentioned above, for connections between two components, welding, bolt and nut connection, bolt or screw connection, or other known connection methods can be selected according to the actual situation. They will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise specified, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their electrical connection relationships and specific circuit structures will not be elaborated here. Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies and will not be elaborated upon in this invention. Of all the solutions mentioned above, those involving the connection between solar panels and batteries can be equipped with essential accessories such as inverters, battery charging controllers, cables, fuses, and brackets. Their control principles and circuit connections are all existing, well-known, and mature technologies, so their electrical connection relationships and specific circuit structures will not be elaborated here.

Claims

1. A sampling device for remediating heavy metal contaminated soil, comprising a sampling tube (11); and further comprising a pressing mechanism, the pressing mechanism comprising a sleeve (21), characterized in that: The outer wall of the sleeve (21) is connected to four sets of air inlet pipes (22). The sleeve (21) has two sets of first sliding cavities (23) and two sets of second sliding cavities (24). The two sets of first sliding cavities (23) are symmetrical, and the two sets of second sliding cavities (24) are symmetrical. The sleeve (21) also has two sets of first guide grooves (25) and two sets of second guide grooves (26). The first guide grooves (25) and the second guide grooves (26) are connected through a connecting groove (27). The sleeve (21) also includes a pressure relief mechanism. The pressure relief mechanism is provided in four sets, including a fixed cylinder (31). The fixed cylinder (31) is fixedly connected to the upper end face of the sleeve (21). The surface of the fixed cylinder (31) has multiple sets of sliding grooves (32). The inner side of the fixed cylinder (31) is provided with a sealing ring (33) and multiple sets of annular springs (34). The annular springs (34) are located above the sealing rings (33). The bottom end of the fixed cylinder (31) is provided with a limiting ring (35).

2. The sampling device for remediating heavy metal contaminated soil according to claim 1, characterized in that: The upper end face of the sampling tube (11) is connected to a circular plate (12), and the upper end face of the circular plate (12) is provided with two sets of vertical rods (13). The two ends of the sleeve (21) are provided with two sets of third guide grooves (28) that are adapted to the vertical rods (13). The vertical rods (13) are inserted into the third guide grooves (28) and slidably connected to the third guide grooves (28).

3. A sampling device for remediating heavy metal contaminated soil according to claim 2, characterized in that: The other end of each of the two sets of vertical rods (13) is connected to a set of handles (14). A connecting spring (15) is sleeved on the outside of the two sets of vertical rods (13). One end of the connecting spring (15) is fixedly connected to the lower end face of the handle (14), and the other end is fixedly connected to the upper end face of the sleeve (21).

4. A sampling device for remediating heavy metal contaminated soil according to claim 3, characterized in that: Two sets of first sliding cavities (23) are slidably connected to a first pressure rod (29). The upper end face of the first pressure rod (29) is connected to a first tension spring (210). The lower end face of the two sets of first pressure rods (29) is connected to a first pressure plate (211). The upper end face of the first pressure plate (211) is provided with two sets of first guide rods (212). The first guide rods (212) are slidably connected to the corresponding first guide grooves (25).

5. A sampling device for remediating heavy metal contaminated soil according to claim 4, characterized in that: Two sets of second sliding cavities (24) are slidably connected with second pressure rods (213), and the upper end face of the second pressure rods (213) is connected with a second tension spring (214). The lower end face of the two sets of second pressure rods (213) is connected with a second pressure plate (215). The upper end face of the second pressure plate (215) is provided with two sets of second guide rods (216), and the second guide rods (216) are slidably connected with the corresponding second guide grooves (26).

6. A sampling device for remediating heavy metal contaminated soil according to claim 5, characterized in that: Multiple sets of air inlet grooves (217) are provided inside the sleeve (21). The air inlet pipe (22) is connected to the two adjacent sets of the first sliding cavity (23) and the second sliding cavity (24) through the air inlet grooves (217). The side wall of the air inlet groove (217) is also provided with a side groove (218).

7. A sampling device for remediating heavy metal contaminated soil according to claim 6, characterized in that: A bidirectional rod (219) is slidably connected inside the air inlet groove (217). A barrier ring (220) is sleeved on the surface of the bidirectional rod (219). A barrier spring (221) is sleeved on both ends of the barrier ring (220). The other end of the barrier spring (221) is fixedly connected to the inner side wall of the sleeve (21).

8. A sampling device for remediating heavy metal contaminated soil according to claim 7, characterized in that: The inner side of the fixed cylinder (31) is coaxially provided with an intermediate disk (36), and the outer side wall of the intermediate disk (36) is provided with multiple sets of connecting rods (37). The connecting rods (37) are slidably connected to the slide groove (32), and the outer side wall of the fixed cylinder (31) is slidably connected with a push ring (38). The push ring (38) is fixedly connected to the other end of the connecting rod (37).

9. A sampling device for remediating heavy metal contaminated soil according to claim 8, characterized in that: The outer wall of the fixed cylinder (31) is threaded with a threaded sleeve (39), and the upper end face of the threaded sleeve (39) is connected with a push spring (310). A thrust bearing (311) is provided between the push ring (38) and the push spring (310).

10. A sampling device for remediating heavy metal contaminated soil according to claim 9, characterized in that: The intermediate disk (36) is connected to a slide rod (312). A retaining ball (313) is provided at the center of the slide rod (312). The retaining ball (313) abuts against the side wall of the annular spring (34). A sealing disc (314) adapted to the sealing ring (33) is provided on the lower end face of the slide rod (312). The sealing disc (314) and the sealing ring (33) are sealed and abut against each other. A connecting rod (315) is provided on the lower end face of the sealing disc (314). The connecting rod (315) is slidably connected to the limiting ring (35). The lower end faces of the four sets of connecting rods (315) are respectively fixedly connected to the top of the corresponding first tension spring (210) or second tension spring (214).

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