Soil leachate collecting and sampling device

Abstract

The invention discloses a soil leachate collecting and sampling device, which relates to the technical field of soil detection and sampling, and comprises a positioning frame, a sleeve in sliding connection with the side surface of the positioning frame, a sampling tube which is mounted at the lower end of the sleeve and can extend outwards along the sleeve and collect a soil sample, and an extrusion plate arranged in the sampling tube, the squeezing plate can axially slide along the sampling pipe, compact a collected soil sample to separate out soil leachate and synchronously push the soil sample out of the sampling pipe, a liquid guide pipe for transferring the soil leachate penetrates through the sampling pipe, and soil sampling and leachate extraction are integrated into the same process. According to the device, the mutual migration probability of leakage liquid between different soil layers is effectively reduced, residual soil embedded in the groove can be stripped and removed in the collecting process, self-cleaning of a liquid conveying channel is achieved, integrated operation of sampling, liquid separation, sample discharging and self-cleaning is achieved, the operation efficiency is higher, and the device is suitable for on-site rapid sampling and analysis.

Description

Technical Field

[0001] This invention relates to the field of soil testing and sampling technology, specifically to a soil leachate collection and sampling device. Background Technology

[0002] With the increasing severity of environmental pollution, soil, as an important component of the ecosystem, is receiving more and more attention for quality monitoring and protection. In ecological restoration projects, monitoring soil leachate is crucial, as it can reflect the migration and transformation of nutrients, pollutants and other substances in the soil. Understanding changes in soil leachate can effectively assess the restoration effect. Soil leachate collection and sampling devices are specialized equipment used to extract liquid components (such as water, dissolved chemicals, etc.) from soil. Currently, soil leachate sampling devices mainly fall into two technical categories: gravity seepage method and negative pressure adsorption method. Gravity percolation method: This method relies on gravity to recover soil pore water. When the soil is saturated with water, the water permeates downward through the soil pores under the influence of gravity and enters the collection device at the bottom of the percolator. The structure is relatively simple and does not require additional power equipment. However, gravity percolators can only work when the soil is saturated with water and cannot collect percolation from unsaturated soil. They are also easily affected by factors such as soil texture and structure.

[0003] Negative pressure adsorption method: Based on the principle of negative pressure, soil pore water is adsorbed. By pre-emptively drawing air under negative pressure, a negative pressure is formed inside the sampler. Soil leachate enters the ceramic head of the sampler under the action of pressure difference. The surface of the ceramic head begins to have permeation pores, and the soil leachate enters the sampling tube through the permeation pores, thereby realizing the collection of soil leachate. Negative pressure can extract solutions from different layers of soil in situ in the field with little soil disturbance, and there is no need to decompose the soil, so as not to damage the site structure. However, in practice, it was found that when using the negative pressure adsorption method for multi-layer sampling, the liquid extraction process changes the pressure field of the soil around the device. Through negative pressure suction, a local low-pressure zone is formed around it. In the traditional negative pressure suction process, the negative pressure needs to be high enough to draw in the leachate. If the soil has good pore connectivity (such as sandy soil or loose soil), the suction force is large, which may cause the upper and lower layers of leachate to migrate to each other. For example, when sampling the upper soil layer, the deep leachate flows upward under the pressure difference and is simultaneously drawn away. This not only leads to inaccurate sampling of the upper soil leachate, but also reduces the leachate content in the lower soil layer, resulting in insufficient subsequent collection.

[0004] In addition, during the negative pressure adsorption sampling process, soil particles (such as clay and silt) are adsorbed onto the surface of the ceramic head under negative pressure, or enter the permeation pores with the water flow, gradually accumulating and causing blockage, which affects the efficiency of soil leachate permeation sampling. Each sampling requires separate cleaning, and if multi-layer sampling is performed, it needs to be cleaned repeatedly, thus affecting the overall sampling efficiency. To address the aforementioned issues, there is an urgent need for innovative designs based on existing soil leachate collection and sampling devices. Summary of the Invention

[0005] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. Specifically, the present invention aims to provide a soil leachate collection and sampling device to solve the problems mentioned in the background art, such as the migration of soil leachate from different layers during the negative pressure adsorption and absorption of soil leachate, which affects the sampling accuracy, and the potential blockage of permeable pores during the sampling process, which leads to a decrease in sampling efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a soil leachate collection and sampling device, comprising a positioning frame and a sleeve slidably connected to the side of the positioning frame, and a sampling tube installed at the lower end of the sleeve that can extend outward along the sleeve to collect soil samples, and a squeezing plate disposed inside the sampling tube. The squeezing plate can slide axially along the sampling tube and compact the collected soil sample to precipitate soil leachate, and simultaneously push the soil sample out of the sampling tube. The sampling tube has a liquid guiding tube for transferring soil leachate through its interior. The sleeve is also equipped with a piston plate that can slide axially along the sleeve to create a negative pressure inside the sleeve.

[0007] Preferably, the liquid guide tube is a hollow structure, and an upper spiral groove and a lower spiral groove are respectively provided on the surface of the liquid guide tube, and the spiral directions of the upper spiral groove and the lower spiral groove are opposite. The drive rod of the piston plate is sleeved inside the liquid guide tube, and an upper protrusion that can slide along the upper spiral groove is welded to the outer surface of the upper end of the drive rod.

[0008] Preferably, a tapered drill bit is welded to the lower end of the drive rod. The tapered drill bit is located outside the sleeve and slides axially along the liquid guide tube via the drive rod, thereby driving the upper protrusion to slide along the upper spiral groove and rotating along with the liquid guide tube.

[0009] Preferably, the sampling tube includes an upper sleeve that is slidably connected to the lower end of the sleeve, and several clamps distributed at equal angles below the upper sleeve, and the inner wall of each clamp is rotatably connected to a first connecting rod and a second connecting rod.

[0010] Preferably, the inner wall of the extrusion plate is welded with a lower protrusion that slides along the lower spiral groove. The lower protrusion slides along the lower spiral groove by rotating the liquid guide tube, which in turn drives the extrusion plate to slide axially along the inner wall of the sampling tube to expel the soil inside the sampling tube. The soil embedded in the inner wall of the lower spiral groove is also peeled off by the lower protrusion.

[0011] Preferably, one end of the first connecting rod is rotatably connected to the outer wall of the extrusion plate, and one end of the second connecting rod is rotatably connected to the outer wall of the liquid guide tube. A sliding groove is provided on the surface of the upper sleeve corresponding to the positions of the first and second connecting rods. The extrusion plate slides axially along the sampling tube so that the clamping plate expands or contracts around the central axis of the extrusion plate.

[0012] Preferably, a push-pull rod is fixedly connected to the upper surface of the piston plate, the lower surface of the piston plate is welded to the top of the drive rod, and a handle is fixedly connected to the top of the push-pull rod.

[0013] Preferably, a sealing plug that slides along the inner wall of the sleeve is welded to the top of the upper sleeve, a handle is welded to the outer wall of the sleeve, and the middle part of the liquid guide tube is rotatably connected to the sealing plug through a bearing.

[0014] Preferably, a connecting block is slidably connected to one side of the positioning frame, and a caliper is adhered to the surface of the positioning frame. The top of the sleeve is rotatably connected to the connecting block via a bearing.

[0015] Compared with the prior art, the beneficial effects of the present invention are: By integrating soil sampling and leachate extraction into the same process, the liquid guide tube is first driven to rotate by the drive rod, which then drives the auger drill rod to rotate, moving the soil and sending it into the sampling tube to achieve local soil sampling. The clamping plate is simultaneously driven to expand by the double connecting rod to expand the sampling cavity. The increase in the amount of soil sample taken at one time also increases the amount of leachate released at one time, so as to achieve effective sampling. Furthermore, after soil sample collection is completed, the liquid guide tube is reversed again, the clamps close, and the squeezing plate slides down. The soil is squeezed by the squeezing plate and clamps, and the leachate is directly extracted from the soil sample. Compared with the traditional method of waiting for natural seepage or negative pressure adsorption, the external squeezing can obtain a sufficient amount of leachate in a short time, while forming a material barrier to prevent external soil from seeping in. This effectively reduces the probability of mutual migration of leachate between different soil layers, ensuring the representativeness and authenticity of the collected samples. With the sliding connection between the positioning frame and the sleeve, different soil layers can be flexibly switched to meet the comprehensive testing of different soil layers. In addition, while the liquid is being expelled, the squeezing plate can also push the compacted soil sample out of the sampling tube to complete the sample discharge, avoid soil sample residue, prevent cross-contamination between different samples, and ensure the independence and accuracy of each sampling. Furthermore, the liquid guide tube of this invention has a dual function: it serves as both a track for guiding the sliding of the extrusion plate and a liquid delivery channel for soil leachate. When the solution in the soil is extruded due to extrusion, forming leachate, the lower spiral groove becomes a drainage channel, enabling the centralized collection of leachate. During the collection process, the lower protrusion can peel off and remove residual soil embedded in the groove, preventing the spiral groove from becoming blocked and achieving self-cleaning of the liquid delivery channel. This reduces manual cleaning steps, lowers operational complexity, and integrates sampling, liquid analysis, sample discharge, and self-cleaning operations. The structure is compact, the operation is convenient, and it is suitable for rapid on-site sampling and analysis. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the sampling tube embedded in the sleeve according to the present invention.

[0018] Figure 3 This is a schematic diagram of the sampling tube extending from the sleeve structure of the present invention.

[0019] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0020] Figure 5 This is a schematic diagram of the structure in which the clamping plate gradually unfolds during the sliding process of the extrusion plate of the present invention.

[0021] Figure 6 This is a schematic diagram of the liquid guiding tube structure of the present invention.

[0022] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B.

[0023] Figure 8 This is a schematic cross-sectional view of the extrusion plate of the present invention.

[0024] In the diagram: 1. Positioning frame; 101. Connecting block; 102. Caliper; 2. Sleeve; 3. Sampling tube; 301. Upper sleeve; 302. Clamping plate; 303. First connecting rod; 304. Second connecting rod; 305. Sealing plug; 306. Slide groove; 4. Squeezing plate; 5. Liquid guide tube; 501. Upper spiral groove; 502. Lower spiral groove; 503. Drive rod; 504. Upper protrusion; 505. Conical drill bit; 6. Piston plate; 7. Push-pull rod; 8. Lower protrusion. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 8 The present invention provides a technical solution: a soil leachate collection and sampling device, including a positioning frame 1 and a sleeve 2 slidably connected to the side of the positioning frame 1, and a sampling tube 3 installed at the lower end of the sleeve 2 that can extend outward along the sleeve 2 to collect soil samples, and a squeezing plate 4 disposed inside the sampling tube 3. The squeezing plate 4 can slide axially along the sampling tube 3 and compact the collected soil sample to precipitate the soil leachate, and simultaneously push the soil sample out of the sampling tube 3. A liquid guide tube 5 for transferring soil leachate passes through the inside of the sampling tube 3. A piston plate 6 that can slide axially along the sleeve 2 is also installed inside the sleeve 2 to create a negative pressure inside the sleeve 2; By integrating soil sampling and leachate extraction into the same process, local soil samples are taken first, and then leachate is extracted directly from the soil sample by the mechanical pressure of the squeezing plate 4. Compared with the traditional method of waiting for natural seepage or negative pressure adsorption, the external squeezing can obtain a sufficient amount of leachate in a short time and quickly extract the leachate, reducing the probability of mutual migration of leachate between different soil layers and ensuring the representativeness and authenticity of the collected samples. With the sliding connection between the positioning frame 1 and the sleeve 2, different soil layers can be flexibly switched to meet the comprehensive testing of different soil layers. In addition, while the liquid is being separated, the squeezing plate 4 can also push the compacted soil sample out of the sampling tube 3 to complete the sample discharge, avoid soil sample residue, prevent cross-contamination between different samples, ensure the independence and accuracy of each sampling, reduce manual cleaning steps, reduce operational complexity, and realize integrated operation of sampling, liquid separation, sample discharge and self-cleaning. The structure is compact, the operation is convenient, and it is suitable for rapid on-site sampling and analysis.

[0027] In this embodiment, as Figure 6 and Figure 7 As shown, the liquid guide tube 5 is a hollow structure, and an upper spiral groove 501 and a lower spiral groove 502 are respectively provided on the surface of the liquid guide tube 5. The spiral directions of the upper spiral groove 501 and the lower spiral groove 502 are opposite. The drive rod 503 of the piston plate 6 is sleeved inside the liquid guide tube 5. An upper protrusion 504 that can slide along the upper spiral groove 501 is welded to the outer surface of the upper end of the drive rod 503. A tapered drill bit 505 is welded to the lower end of the drive rod 503. The tapered drill bit 505 is located outside the sleeve 2. It slides axially along the liquid guide tube 5 via the drive rod 503 to drive the upper protrusion 504 to slide along the upper spiral groove 501 and rotate along with the liquid guide tube 5. It should be noted that the liquid guide tube 5, as the core component, adopts a hollow structure for the transfer of soil leachate, and has an upper spiral groove 501 and a lower spiral groove 502 respectively set on its surface. The two spiral grooves rotate in opposite directions, so that the piston plate 6 and the squeezing plate 4 can move relative to each other. The piston plate 6 moves down and the squeezing plate 4 moves up to provide space for the soil sample. Conversely, during the process of the piston plate 6 moving up to draw up the sample, the squeezing plate 4 moves down to squeeze out the soil, thus completing the sample discharge. Meanwhile, a drive rod 503 is sleeved inside the liquid guide tube 5. An upper protrusion 504 is welded to the upper outer surface of the drive rod 503. The upper protrusion 504 can slide along the upper spiral groove 501 on the surface of the liquid guide tube 5. When the drive rod 503 is driven, the upper protrusion 504 moves along the upper spiral groove 501, thereby driving the entire liquid guide tube 5 to rotate. A tapered drill bit 505 is welded to the lower end of the drive rod 503. The tapered drill bit 505 is initially located at the lower end face of the sleeve 2. The auxiliary sleeve 2 is inserted into the soil, and then the auxiliary sampling tube 3 extends to the outside of the sleeve 2 to enter the soil sample for sampling. This can improve the soil sample sampling efficiency and reduce resistance.

[0028] In this embodiment, as Figure 3 and Figure 4 As shown, the sampling tube 3 includes an upper sleeve 301 that is slidably connected to the lower end of the sleeve 2, and several clamping plates 302 distributed at equal angles below the upper sleeve 301. The inner wall of each clamping plate 302 is rotatably connected to a first connecting rod 303 and a second connecting rod 304. It should be noted that the upper sleeve 301 is slidably connected to the lower end of the sleeve 2. Several clamping plates 302 are arranged at equal angles below the upper sleeve 301. The inner wall of each clamping plate 302 is rotatably connected to a first connecting rod 303 and a second connecting rod 304. The double connecting rod structure is used to control the opening or closing of the clamping plate 302. When the clamping plate 302 is fully closed, it is easy to store it in the sleeve 2. Specifically, in the initial state, the sampling tube 3 is embedded in the sleeve 2, and several clamping plates 302 are in a closed state. When the drive rod 503 drives the conical drill bit 505 to drill into the soil, the sampling tube 3 is simultaneously subjected to force and moves downward. At this time, the clamping plates 302 open outward due to the action of the double connecting rod. In this embodiment, the clamping plates 302 are generally conical with a sharp corner at the lower end and clear edges on the outer wall. When in contact with the soil, they perform horizontal and vertical shearing of the soil, which facilitates soil breaking. After the clamping plates 302 are fully unfolded, a larger sampling space is formed, so that the soil or sample can enter the sampling chamber more easily, thereby increasing the amount of soil sample taken at one time and increasing the amount of soil leachate released at one time to achieve effective sampling.

[0029] In this embodiment, as Figure 6 and Figure 7 As shown, the inner wall of the extrusion plate 4 is welded with a lower protrusion 8 that slides along the lower spiral groove 502. The lower protrusion 8 is driven to slide along the lower spiral groove 502 by rotating the liquid guide tube 5, which further drives the extrusion plate 4 to slide axially along the inner wall of the sampling tube 3 to expel the soil inside the sampling tube 3, and the soil embedded in the inner wall of the lower spiral groove 502 is peeled off by the lower protrusion 8. One end of the first connecting rod 303 is rotatably connected to the outer wall of the extrusion plate 4, and one end of the second connecting rod 304 is rotatably connected to the outer wall of the liquid guide tube 5. A sliding groove 306 is provided on the surface of the upper sleeve 301 at the position corresponding to the first connecting rod 303 and the second connecting rod 304. The extrusion plate 4 slides axially along the sampling tube 3 so that the clamping plate 302 can expand or retract around the central axis of the extrusion plate 4. It should be noted that the upper protrusion 504 is fixed to the top of the drive rod 503 and cooperates with the upper spiral groove 501. The lower protrusion 8 is welded to the inner wall of the extrusion plate 4. When the upper protrusion 504 slides along the upper spiral groove 501, it can drive the liquid guide tube 5 to rotate. At the same time, the lower protrusion 8 cooperates with the lower spiral groove 502 and slides along the lower spiral groove 502. The extrusion plate 4 begins to move downward in a straight line. The extrusion plate 4 slides along the inner wall of the sampling tube 3 and pushes the soil sample out from the bottom of the sampling tube 3. Meanwhile, in this embodiment, for example... Figure 5As shown, the lower spiral groove 502 and the upper spiral groove 501 have dual functions. The lower spiral groove 502 is close to the sampling tube 3, and the upper spiral groove 501 is close to the piston plate 6. The lower spiral groove 502 serves as both a track for guiding the sliding of the extrusion plate 4 and a channel for transporting soil leachate. The solution in the soil will precipitate out due to extrusion, forming leachate. At this time, the lower spiral groove 502 becomes a drainage channel, and the leachate will flow along the groove of the lower spiral groove 502 and finally be transported into the sleeve 2 through the upper spiral groove 501 to achieve centralized collection of leachate. During the collection process, the liquid is squeezed out by the clamp 302. Compared with the traditional method of relying on negative pressure to extract the liquid, it can improve the precipitation efficiency of leachate and form a physical barrier to reduce the entry of external soil and reduce the probability of leachate migrating between upper and lower soil layers. like Figure 8 As shown, when the liquid guide tube 5 rotates, the lower protrusion 8 slides along the lower spiral groove 502. During the sliding process of the lower protrusion 8 along the lower spiral groove 502, its edge will come into close contact with and scrape against the groove wall of the lower spiral groove 502, peeling off and removing the residual soil embedded in the groove, avoiding the spiral groove from being blocked, reserving a smooth movement track for the next sampling, and preventing blockage, so as to realize the self-cleaning function of the liquid delivery channel of soil leachate, ensuring the efficiency of each sampling, and simplifying the synchronous operation of solid soil sampling and liquid component sampling. Furthermore, both ends of the first connecting rod 303 and the second connecting rod 304 are rotatably connected. One end of the first connecting rod 303 is rotatably connected to the outer wall of the extrusion plate 4, and one end of the second connecting rod 304 is rotatably connected to the outer wall of the liquid guide tube 5. The position of the top end of the second connecting rod 304 is controlled by the liquid guide tube 5, and the up and down sliding of the extrusion plate 4 drives the first connecting rod 303 and the second connecting rod 304 to rotate, thereby creating traction on the clamping plate 302. At the same time, the sliding groove 306 guides and limits the first connecting rod 303 and the second connecting rod 304. This not only controls the vertical up and down sliding of the extrusion plate 4, but also further controls the opening or closing movement of the clamping plate 302 when the extrusion plate 4 is sliding. The overall structure is compact and easy to maintain later.

[0030] In this embodiment, as Figure 2 and Figure 3 As shown, a push-pull rod 7 is fixedly connected to the upper surface of the piston plate 6, the lower surface of the piston plate 6 is welded to the top of the drive rod 503, and a handle is fixedly connected to the top of the push-pull rod 7. It should be noted that the piston plate 6 is rigidly connected to the drive rod 503 by welding. When the push-pull rod 7 is pushed or pulled, it will drive the piston plate 6 and the drive rod 503 to move up and down together. At this time, the upper protrusion 504 welded to the upper outer surface of the drive rod 503 will slide along the upper spiral groove 501 on the surface of the liquid guide tube 5, thereby converting the linear motion of the piston plate 6 into the rotational motion of the liquid guide tube 5. The handle provides a manual operation interface, which can manually push the piston plate 6 up and down to transmit power. The piston plate 6 mainly achieves the following functions: When the piston plate 6 moves down, the sampling tube 3 gradually slides out, and at the same time the squeezing plate 4 retracts and the clamping plate 302 unfolds, increasing the amount of soil sample taken at one time. Conversely, when the piston plate 6 moves down, a negative pressure is formed inside the sleeve 2, the squeezing plate 4 slides down and squeezes out the soil, and the clamping plate 302 closes, forming a wrapping squeezing of the soil sample in the inner cavity, squeezing out the leachate from the soil sample, and under the action of negative pressure, transferring it to the sleeve 2 through the liquid guide tube 5.

[0031] In this embodiment, as Figure 4 As shown, a sealing plug 305 that slides along the inner wall of the sleeve 2 is welded to the top of the upper sleeve 301, and a handle is welded to the outer wall of the sleeve 2. The middle part of the liquid guide tube 5 is rotatably connected to the sealing plug 305 through a bearing. It should be noted that the sealing plug 305 is welded to the upper sleeve 301, blocking the gap between the upper sleeve 301 and the sleeve 2 so that the local area inside the sleeve 2 remains sealed, preventing soil debris from entering the device during sampling. The lower edge of the sleeve 2 is not a straight opening, but rather a constricted opening. When the sampling tube 3 moves down, the sampling tube 3 can pass smoothly through the constricted opening, while simultaneously blocking the sealing plug 305, limiting the stroke of the sampling tube 3, and preventing the sampling tube 3 from completely detaching from the drill bit. The handle is welded to the outer wall of the sleeve 2 for easy operation. When the device is inserted into the soil, the serrated edge at the lower end of the sleeve 2 helps the entire device cut into the soil and reduces insertion resistance.

[0032] In this embodiment, as Figure 1 As shown, a connecting block 101 is slidably connected to one side of the positioning frame 1, and a caliper 102 is adhered to the surface of the positioning frame 1. The top of the sleeve 2 is rotatably connected to the connecting block 101 through a bearing. It should be noted that the positioning frame 1 serves as the supporting component of the entire device, providing a stable installation base for the sampling operation and preventing the device from shaking during sampling, which would affect the depth accuracy. The caliper 102 is attached to the surface for easy and intuitive reading of the sampling depth. The connecting block 101 and the positioning frame 1 are slidably connected and used to connect the sleeve 2. The connecting block 101 and the sleeve 2 slide synchronously, and the sleeve 2 can rotate independently. When the resistance is large during the insertion of the soil, the sleeve 2 can rotate left and right independently while the positioning frame 1 remains stationary to eliminate the resistance. The surface of the connecting block 101 is provided with a slider that slides along the caliper 102, making the sampling depth more intuitive.

[0033] Working principle: When using this soil leachate collection and sampling device, the first step is to prepare by inserting the sleeve 2 to the specified depth and setting up the positioning frame 1 in the sampling area. By operating the handle, the sleeve 2 is inserted into the soil. At this time, the clamp 302 of the sampling tube 3 is in a closed state, the conical drill bit 505 is located outside the sleeve 2, and the entire sampling tube 3 is embedded in the sleeve 2. The clamp 302 is limited by the inner wall of the sleeve 2 and cannot be unfolded, so that the squeezing plate 4 is always located at the lower end of the sampling tube 3 and will not slide inward. During the process of inserting the sleeve 2 into the soil, the soil will not enter the sampling tube 3. Next, soil sample collection begins: When the sleeve 2 reaches the designated depth, the push-pull rod 7 and piston plate 6 are pressed down by operating the handle, and slide inside the sleeve 2 to form a negative pressure environment, in preparation for subsequent liquid absorption. During the downward movement of the piston plate 6, the upper protrusion 504 at the upper end of the drive rod 503 moves along the upper spiral groove 501 on the liquid guide tube 5. In the initial stage, due to the compression of the clamping plate 302 by the sleeve 2, the clamping plate 302 cannot be unfolded. At this time, the sampling tube 3, the liquid guide tube 5 and the drive rod 503 move synchronously until the lower half of the sampling tube 3 is separated from the sleeve 2, and the constraint of the sleeve 2 on the clamping plate 302 disappears. As the clamping plate 302 is released, the drive rod 503 continues to slide down, the upper protrusion 504 slides along the upper spiral groove 501, the liquid guide tube 5 is subjected to vertical pressure and is also pushed by the upper protrusion 504 to rotate, the liquid guide tube 5 rotates counterclockwise, driving the lower spiral groove 502 to rotate counterclockwise at the same time, driving the lower protrusion 8 and the extrusion plate 4 to move upward. At the same time, the conical drill bit 505 breaks through the soil, causing the sampling tube 3 to slowly extend to the outside of the sleeve 2. The clamping plate 302 is pulled by the first connecting rod 303 and the second connecting rod 304, causing the clamping plate 302 to unfold and expand the inner cavity to accommodate more soil samples. Then, the exudate is squeezed and discharged: when the sealing plug 305 is stuck at the lower end of the sleeve 2 and the piston plate 6 slides to the end of its stroke, the exudate can be squeezed out. Pull the push rod 7 and the piston plate 6 moves up. At this time, the upper protrusion 504 moves up along the upper spiral groove 501, driving the liquid guide tube 5 to rotate clockwise. At the same time, the lower spiral groove 502 rotates clockwise. The lower protrusion 8 drives the squeezing plate 4 to move down. The clamping plate 302 gradually closes and begins to squeeze the soil sample in the inner cavity to assist in the exudate. Furthermore, as the lower protrusion 8 slides along the lower spiral groove 502, its edge will come into close contact with and scrape against the groove wall of the lower spiral groove 502, peeling away and removing the residual soil embedded in the groove. The extrusion plate 4 continues to slide down, eventually pushing the soil sample from the inner cavity out of the sampling tube 3, thus completing the sample discharge. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A soil leachate collection and sampling device, comprising a positioning frame (1) and a sleeve (2) slidably connected to the side of the positioning frame (1), characterized in that: It also includes a sampling tube (3) installed at the lower end of the sleeve (2) that can extend outward along the sleeve (2) to collect soil samples, and a squeezing plate (4) set inside the sampling tube (3). The squeezing plate (4) can slide axially along the sampling tube (3) and compact the collected soil sample to release soil leachate, and simultaneously push the soil sample out of the sampling tube (3). The inside of the sampling tube (3) is a liquid guide tube (5) for transferring soil leachate. The sleeve (2) is also equipped with a piston plate (6) that can slide axially along the sleeve (2) to form a negative pressure inside the sleeve (2).

2. The soil leachate collection and sampling device according to claim 1, characterized in that: The liquid guide tube (5) is a hollow structure, and an upper spiral groove (501) and a lower spiral groove (502) are respectively provided on the surface of the liquid guide tube (5), and the spiral directions of the upper spiral groove (501) and the lower spiral groove (502) are opposite. The drive rod (503) of the piston plate (6) is sleeved inside the liquid guide tube (5), and an upper protrusion (504) that can slide along the upper spiral groove (501) is welded to the outer surface of the upper end of the drive rod (503).

3. The soil leachate collection and sampling device according to claim 2, characterized in that: A tapered drill bit (505) is welded to the lower end of the drive rod (503). The tapered drill bit (505) is located outside the sleeve (2). It slides axially along the liquid guide tube (5) via the drive rod (503) to drive the upper protrusion (504) to slide along the upper spiral groove (501) and rotate along the liquid guide tube (5).

4. The soil leachate collection and sampling device according to claim 1, characterized in that: The sampling tube (3) includes an upper sleeve (301) that is slidably connected to the lower end of the sleeve (2), and several clamps (302) distributed at equal angles below the upper sleeve (301), and the inner wall of each clamp (302) is rotatably connected to a first connecting rod (303) and a second connecting rod (304).

5. The soil leachate collection and sampling device according to claim 2, characterized in that: The inner wall of the extrusion plate (4) is welded with a lower protrusion (8) that slides along the lower spiral groove (502). The liquid guide tube (5) is rotated to drive the lower protrusion (8) to slide along the lower spiral groove (502), which further drives the extrusion plate (4) to slide axially along the inner wall of the sampling tube (3) to expel the soil inside the sampling tube (3), and the soil embedded in the inner wall of the lower spiral groove (502) is peeled off by the lower protrusion (8).

6. The soil leachate collection and sampling device according to claim 4, characterized in that: One end of the first connecting rod (303) is rotatably connected to the outer wall of the extrusion plate (4), and one end of the second connecting rod (304) is rotatably connected to the outer wall of the liquid guide tube (5). A sliding groove (306) is provided on the surface of the upper sleeve (301) at the position corresponding to the first connecting rod (303) and the second connecting rod (304). The extrusion plate (4) slides axially along the sampling tube (3) so that the clamping plate (302) can expand or retract around the central axis of the extrusion plate (4).

7. The soil leachate collection and sampling device according to claim 3, characterized in that: A push-pull rod (7) is fixedly connected to the upper surface of the piston plate (6), the lower surface of the piston plate (6) is welded to the top of the drive rod (503), and a handle is fixedly connected to the top of the push-pull rod (7).

8. The soil leachate collection and sampling device according to claim 4, characterized in that: The top of the upper sleeve (301) is welded with a sealing plug (305) that slides along the inner wall of the sleeve (2), and the outer wall of the sleeve (2) is welded with a handle. The middle part of the liquid guide tube (5) is rotatably connected to the sealing plug (305) through a bearing.

9. The soil leachate collection and sampling device according to claim 1, characterized in that: A connecting block (101) is slidably connected to one side of the positioning frame (1), and a caliper (102) is glued to the surface of the positioning frame (1). The top of the sleeve (2) is rotatably connected to the connecting block (101) through a bearing.

Images