A directional coring device for soil pollution condition investigation

Abstract

This invention belongs to the field of sampling and collection technology, specifically a directional coring device for soil pollution investigation. It includes a base and a sampling mechanism. The base is an annular disc, with hydraulic cylinders installed on both sides, their output ends facing upwards. A fixing ring is installed at the center of the base, and a threaded sleeve is rotatably installed at the center of the fixing ring. The bottom end of the threaded sleeve passes through the fixing ring. The sampling mechanism is located inside the threaded sleeve, with its bottom end passing through the threaded sleeve. A pressure plate is installed at the top of the sampling mechanism, and a motor is installed at the top of the pressure plate, mounted at the center of a connecting plate. The bottom ends of the connecting plate are fixedly connected to the output ends of the hydraulic cylinders on both sides of the base. This invention has the advantage that when the pressure plate rotates forward, each layer of the sampling mechanism can rotate synchronously; when the pressure plate rotates in reverse, each layer of the sampling mechanism remains stable and does not rotate relative to each other, ensuring that the soil core remains intact and does not break during coring.

Description

Technical Field

[0001] This invention belongs to the field of sampling and collection technology. Specifically, this invention relates to a directional coring device for investigating soil pollution status. Background Technology

[0002] Soil pollution investigation and sampling is a crucial step in assessing soil pollution status. It involves collecting soil samples vertically from the surface to depths of tens of meters and conducting experimental analysis to determine the content of pollutants to ascertain whether the soil is contaminated. Core sampling aims primarily to identify the types and concentrations of pollutants, determine the extent of contamination, and provide data support for health and ecological risk assessments. Commonly used sampling methods include surface sampling, borehole sampling, and profile sampling, suitable for shallow, deep, and detailed studies, respectively. Sampling equipment includes manual samplers, mechanical drilling rigs, and automatic samplers, suitable for sampling needs of varying depths and complexity.

[0003] For example, the invention patent with authorized public number CN118190508B provides a soil sampling and testing device for geological surveying, including a base, a fixing ring fixedly sleeved in the middle of the inner curved surface of the base, a threaded sleeve fixedly sleeved in the middle of the inner curved surface of the fixing ring, the threaded sleeve fixedly sleeved with the inner curved surface of the base, the inner curved surface of the threaded sleeve having threads, and multiple support columns equidistantly arranged on the upper circumference of the upper surface of the base, with mounting seats fixedly installed on the upper part of the inner curved surface of the multiple support columns, and a rotating sleeve fixedly installed in the middle of the mounting seats. By reducing the air pressure between the inner cavity plug of the ring cavity and the air-permeable membrane, the deep hard soil in the middle of the air-permeable membrane is tightly adsorbed onto the inner curved surface of the air-permeable membrane, thereby solving the problem that when existing integrated core drill bits are used to core deep soil, the insufficient friction between the soil core and the inner curved surface of the core drill bit leads to the core drill bit being unable to separate the soil core from the soil and the soil core breaking at any position in the inner cavity of the core drill bit, resulting in core sampling failure.

[0004] However, by setting up multiple sampling mechanisms to reduce the air pressure inside the sampling mechanism, relative rotation will occur between the upper and lower sampling mechanisms, which may cause the soil core to break between the upper and lower sampling mechanisms. In summary, the device still has room for improvement. Summary of the Invention

[0005] In view of this, the present invention provides a directional coring device for soil pollution status investigation, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0006] To achieve the aforementioned objectives, the present invention provides a directional coring device for soil pollution status investigation, comprising a base and a sampling mechanism. The base is an annular disc, and hydraulic cylinders are installed on both sides of the base with their output ends facing upwards. A fixing ring is installed at the center of the base, and a threaded sleeve is rotatably installed at the center of the fixing ring. The bottom end of the threaded sleeve passes through the fixing ring, and its top end is located above the base. The sampling mechanism is disposed inside the threaded sleeve, and its bottom end passes through the threaded sleeve. A pressure plate is provided at the top of the sampling mechanism, and a motor is provided at the top of the pressure plate and is installed at the center of a connecting plate. The bottom ends of both ends of the connecting plate are fixedly connected to the output ends of the hydraulic cylinders on both sides of the base.

[0007] In the aforementioned directional coring device for soil pollution investigation, optionally, the sampling mechanism includes an inner tube, an outer tube, a sliding rod, and cutting ring teeth. The sampling mechanism is configured as a multi-layer spliced ​​installation, with the first layer of the sampling mechanism located at the bottom, the top sampling mechanism in contact with the pressure plate, and the cutting ring teeth located at the bottom of the first layer of the sampling mechanism. The outer wall of the outer tube is provided with threads that are adapted to the threads on the inner ring of the threaded sleeve. The inner tube is located inside the outer tube, and a gap is provided between the outer tube and the inner tube. The sliding rod is located in the gap.

[0008] In the aforementioned directional coring device for investigating soil pollution, optionally, the middle part of the sliding rod is an elastic telescopic rod, a first groove is provided on the outer wall of the inner tube, a movable ring is slidably disposed in the first groove, and the sliding rod is disposed in the movable ring.

[0009] In the aforementioned directional coring device for investigating soil pollution, optionally, the sliding rod is provided with a first U-shaped block at the top, pulleys are rotatably mounted on the top of the two vertical sections of the first U-shaped block, a limit block is provided at the bottom of the sliding rod, a second sliding groove is provided below the first U-shaped block, and an extension rod is provided at the bottom of the outer wall of the second inner tube.

[0010] In the directional coring device for soil pollution investigation as described above, optionally, the cutting ring teeth include a fixed sleeve and a movable ring teeth. The fixed sleeve is disposed at the bottom of the outer wall of the first layer of the outer tube, and the movable ring teeth are slidably disposed on the inner wall surface of the fixed sleeve.

[0011] In the aforementioned directional coring device for investigating soil pollution, optionally, a synchronization block is provided between the movable ring tooth and the fixed sleeve, and the synchronization block can contact the upper limiting block.

[0012] In the aforementioned directional coring device for soil pollution investigation, optionally, a second U-shaped block is provided at the top of the synchronization block, an insertion rod is provided at the bottom of the synchronization block, a T-shaped block is fixedly provided on the side of the synchronization block away from the insertion rod, a third sliding groove is provided on the inner wall of the fixed sleeve, the T-shaped block is slidably connected to the third sliding groove, an inclined groove is provided on the outer wall of the movable ring tooth, and the end of the insertion rod away from the T-shaped block is provided in the inclined groove.

[0013] In the directional coring device for soil pollution investigation as described above, optionally, the pressure plate includes a trapezoidal block, a first stop block, and a second stop block. An annular plate is provided at the bottom of the pressure plate, and a groove is provided on the annular plate. A trapezoidal block and a first stop block are provided at one end of the groove, and a second stop block is provided at the other end of the groove. The first stop block is located below the trapezoidal block, and the sliding rod is located below the groove.

[0014] In the aforementioned directional coring device for investigating soil pollution, optionally, a first gear is provided on the outer surface of the top of the threaded sleeve, the first gear is located above the base, a second gear is provided on one side of the first gear, the second gear is adapted to the first gear, a motor is provided on the top of the second gear, and the motor is mounted on a bracket, the bracket being fixedly connected to the base.

[0015] This invention discloses a directional coring device for investigating soil pollution. It employs a modular sampling mechanism and an inner and outer tube configuration. The outer tube has a cutting ring at its bottom to cut the soil and obtain a soil core. The inner tube collects and stores the soil core. A sliding rod ensures that all inner tubes form a single unit during cutting and extraction from the sampling mechanism, preventing relative rotation and maintaining the integrity of the soil core. Furthermore, the cutting ring is controlled to ensure the outer tube remains stable throughout the process of switching from cutting to extraction. Attached Figure Description

[0016] The disclosure of this invention will become more apparent from the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall structure of the sampling mechanism of the present invention.

[0019] Figure 3 This is a cross-sectional view of the inner tube and outer tube of the present invention.

[0020] Figure 4 This is a schematic diagram of the inner tube connection structure of the present invention.

[0021] Figure 5 This is a cross-sectional view of the inner tube of the present invention.

[0022] Figure 6 This is a schematic diagram of the cutting ring tooth connection structure of the present invention.

[0023] Figure 7 This is a schematic diagram of the pressure plate connection structure of the present invention.

[0024] Reference numerals in the attached drawings: 1. Base; 2. Sampling mechanism; 2-1. Inner tube; 2-2. Outer tube; 2-3. Sliding rod; 2-4. Cutting ring tooth; 2-5. Movable ring; 2-6. First slide groove; 2-7. First U-shaped block; 2-8. Pulley; 2-9. Second slide groove; 2-10. Extension rod; 2-11. Limiting block; 2-12. Fixing sleeve; 2-13. Movable ring tooth; 2-14. Third slide groove; 2-15. Inclined groove; 3. Hydraulic cylinder; 4. Threaded sleeve; 5. Fixing ring; 6. Pressure plate; 6-1. Groove; 6-2. Trapezoidal block; 6-3. First stop block; 6-4. Second stop block; 7. Connecting plate; 8. Synchronizing block; 8-1. Second U-shaped block; 8-2. T-shaped block; 8-3. Insertion rod; 9. First gear; 10. Second gear; 11. Bracket. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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] like Figures 1 to 7 As shown, a typical embodiment of the present invention provides a directional coring device for soil pollution status investigation, including a base 1 and a sampling mechanism 2. The base 1 is an annular disc, and hydraulic cylinders 3 are installed on both sides of the base 1, with the output ends of the hydraulic cylinders 3 facing upwards. A fixing ring 5 is installed at the center of the base 1, and a threaded sleeve 4 is rotatably installed at the center of the fixing ring 5. The bottom end of the threaded sleeve 4 passes through the fixing ring 5, and the top end is located above the base 1. The sampling mechanism 2 is disposed inside the threaded sleeve 4, and the bottom of the sampling mechanism 2 passes through the threaded sleeve 4. A pressure plate 6 is provided at the top of the sampling mechanism 2, and a motor is provided at the top of the pressure plate 6 and is installed at the center of a connecting plate 7. The bottom ends of both ends of the connecting plate 7 are fixedly connected to the output ends of the hydraulic cylinders 3 on both sides of the base 1.

[0027] In this embodiment, the base 1 is placed on the ground where sampling is required. The truncated cone on the top of the base 1 has a hollow structure. The fixing ring 5 between the two side supports 11 of the truncated cone is located above the truncated cone. The middle area of ​​the threaded sleeve 4 is located between the truncated cone and the fixing ring 5. The bottom extension of the threaded sleeve 4 is located in the hollow area in the center of the truncated cone of the base 1. The top extension of the threaded sleeve 4 is located in the inner ring of the fixing ring 5. The threaded sleeve 4 is stably clamped on the base 1. When the motor on the top telescopic frame rotates, it drives the pressure plate 6 to rotate, so that the pressure plate 6 can push the sampling mechanism 2 to rotate. A part of the sampling mechanism 2 is connected to the threaded sleeve 4. When the sampling mechanism 2 rotates, the threaded sleeve 4 causes the sampling mechanism 2 to move downward while rotating, so that the sampling mechanism 2 can penetrate deep into the soil from the ground surface, thereby collecting soil cores.

[0028] The sampling mechanism 2 includes an inner tube 2-1, an outer tube 2-2, a sliding insert rod 2-3, and a cutting ring tooth 2-4. The sampling mechanism 2 is a spliced ​​sampling mechanism 2 with multiple layers. The first layer of the sampling mechanism 2 is located at the bottom, and the top sampling mechanism 2 is in contact with the pressure plate 6. The cutting ring tooth 2-4 is located at the bottom of the first layer of the sampling mechanism 2. The outer wall of the outer tube 2-2 is provided with threads, which are adapted to the threads on the inner ring of the threaded sleeve 4. The inner tube 2-1 is located inside the outer tube 2-2, and a gap is provided between the outer tube 2-2 and the inner tube 2-1. The sliding insert rod 2-3 is located in the gap.

[0029] In this embodiment, the sampling mechanism 2 adopts a multi-layer splicing structure. When it is necessary to sample deep soil, the drilling depth can be increased simply by increasing the number of layers of the sampling mechanism 2. There is no need to prepare a long drill bit, making transportation convenient. The drilling depth can be flexibly adjusted. The sliding rod 2-3 can connect all the outer tubes 2-2 and the inner tubes 2-1, so that when the inner tube 2-1 rotates, it can drive the outer tube 2-2 to rotate, or when the outer tube 2-2 rotates, it can drive the inner tube 2-1 to rotate.

[0030] The middle part of the sliding rod 2-3 is an elastic telescopic rod. The outer wall of the inner tube 2-1 is provided with a first sliding groove 2-6. A movable ring 2-5 is slidably arranged in the first sliding groove 2-6, and the sliding rod 2-3 is arranged in the movable ring 2-5.

[0031] In this embodiment, the sliding rod 2-3 can slide on the circumferential surface of the inner circle under the action of the movable ring 2-5. When the sliding rod 2-3 slides to the maximum distance, the sliding rod 2-3 can drive the inner tube 2-1 to rotate in its own circumferential direction. When the sliding rod 2-3 slides to the maximum distance, the inner wall surface of the gap between the sliding rod 2-3 and the outer tube 2-2 comes into contact, so that the sliding rod 2-3 can drive the inner tube 2-1 and the outer tube 2-2 to rotate together in their own circumferential direction.

[0032] The sliding rod 2-3 is set at the top of the first U-shaped block 2-7. The top of the two vertical sections of the first U-shaped block 2-7 is rotatably mounted with pulleys 2-8. The bottom of the sliding rod 2-3 is provided with a limit block 2-11. The bottom of the first U-shaped block 2-7 is provided with a second sliding groove 2-9. The bottom of the outer wall of the second inner tube 2-1 is provided with an extension rod 2-10.

[0033] In this embodiment, the limiting block 2-11 on the upper sampling mechanism 2 can be inserted into the first U-shaped block 2-7 of the lower sampling mechanism 2. When the second sampling mechanism 2 needs to be installed after the first sampling mechanism 2 has drilled into the soil, the upper and lower sampling mechanisms 2 can be aligned with the first U-shaped block 2-7 on the sliding rod 2-3 as the reference position.

[0034] When the pressure plate 6 pushes the sliding rod 2-3 to rotate clockwise, the pressure plate 6 squeezes the top sliding rod 2-3, causing the top first U-shaped block 2-7 of the top sliding rod 2-3 to compress the spring downward to the maximum distance. Then, the pressure plate 6 continues to squeeze the top sliding rod 2-3, causing the bottom limiting block 2-11 of the sliding rod 2-3 to squeeze the bottom first U-shaped block 2-7. This compresses all the sliding rods 2-3 in sequence, keeping all the sliding rods 2-3 in a stable state and rotating to the maximum distance to drive the inner and outer tubes 2-2 to rotate synchronously.

[0035] When the sampling mechanism 2 needs to remove the sample from the soil, the pressure plate 6 rotates in the reverse direction, causing the pressure of the pressure plate 6 on the top sliding rod 2-3 to disappear. The upper first U-shaped block 2-7 bounces upward and resets, causing the pressure of the limiting block 2-11 to disappear. The lower first U-shaped block 2-7 then resets sequentially. At this time, the pressure plate 6 pushes the first U-shaped block 2-7 of the top sliding rod 2-3, causing all the sliding rods 2-3 to rotate in the reverse direction to their maximum distance. When this happens, the opening of the second groove 2-9 passes over the extension rod 2-10, and the inclined surface of the second groove 2-9 is squeezed by the extension rod 2-10, causing the U-shaped slider to move upward and stretch the spring until the extension block is in position. Within the vertical section of the second chute 2-9, the first U-shaped block 2-7 is reset. At this time, the first U-shaped block 2-7 is locked by the extension rod 2-10, and all the sliding rods 2-3 are locked, so that all the inner tubes 2-1 are integrated and cannot rotate relative to each other. At this time, the pressure plate 6 continues to push the top sliding rod 2-3, so that the sliding rod 2-3 pushes the inner and outer tubes 2-2 to rotate synchronously in opposite directions in the locked state until the sampling mechanism 2 is completely removed. All the inner tubes 2-1 remain in a stable state, so that the soil core remains intact during the process of removing the sampling mechanism 2, and no inner tube 2-1 will break, causing core sampling failure.

[0036] The cutting ring tooth 2-4 includes a fixed sleeve 2-12 and a movable ring tooth 2-13. The fixed sleeve 2-12 is located at the bottom of the outer wall of the first outer tube 2-2, and the movable ring tooth 2-13 is slidably located on the inner wall surface of the fixed sleeve 2-12.

[0037] In this embodiment, the fixed ring 5 is fixedly installed at the bottom of the outer wall of the first outer tube 2-2, and the movable ring tooth 2-13 can slide up and down in the fixed sleeve 2-12. When cutting the soil, the movable ring tooth 2-13 moves upward to contact the bottom surface of the first inner tube 2-1, stably cutting the soil to collect the soil core. When the sampling mechanism needs to be removed from the soil, the reverse rotation of the sliding rod 2-3 can make all the inner tubes 2-1 and the outer tubes 2-2 rotate synchronously.

[0038] When the sliding rod 2-3 is not in contact with the inner wall of the gap between the outer tube 2-2, the friction between the sliding rod 2-3 and the inner tube 2-1 and the outer tube 2-2 may cause the outer tube 2-2 and the inner tube 2-1 to rotate relative to each other. At this time, the movable ring tooth 2-13 can be displaced downward and inserted into the soil, so that the outer tube 2-2 can be more stable and will not rotate relative to each other, causing the upper soil core and the lower soil core to rotate and break.

[0039] A synchronizing block 8 is provided between the movable ring tooth 2-13 and the fixed sleeve 2-12, and the synchronizing block 8 can contact the upper limiting block 2-11.

[0040] In this embodiment, the limiting block 2-11 can be inserted into the synchronizing block 8. When the limiting block 2-11 rotates in the circumferential direction of the inner circle, it drives the limiting block 2-11 to rotate, so that the movable ring tooth 2-13 slides up and down on the inner wall of the fixed ring 5, thereby controlling the extension and retraction of the movable ring tooth 2-13.

[0041] The top of the synchronization block 8 is provided with a second U-shaped block 8-1, the bottom of the synchronization block 8 is provided with a plug rod 8-3, the side of the synchronization block 8 away from the plug rod 8-3 is fixedly provided with a T-shaped block 8-2, the inner wall of the fixed sleeve 2-12 is provided with a third sliding groove 2-14, the T-shaped block 8-2 is slidably connected with the third sliding groove 2-14, the outer wall of the movable ring tooth 2-13 is provided with a slanted groove 2-15, and the end of the plug rod 8-3 away from the T-shaped block 8-2 is provided in the slanted groove 2-15.

[0042] In this embodiment, the T-shaped block 8-2 can slide within the third groove 2-14, allowing the synchronizing block 8 to rotate in the inner circumferential direction, thereby driving the insertion rod 8-3 to rotate in the inner circumferential direction within the inclined groove 2-15. This causes the insertion rod 8-3 to press against the top surface of the inclined groove 2-15, allowing the movable ring tooth 2-13 to slide upwards on the inner wall of the fixed sleeve 2-12. The limiting block 2-11 can be inserted into the second U-shaped block 8-1. When the pressure plate 6 rotates, causing the sliding insertion rod 2-3 to rotate in a compressed state, the bottom limiting block 2-11 of the sliding insertion rod 2-3 stably pushes the second U-shaped block 8-1 to rotate in the inner circumferential direction in a compressed state, thereby driving the synchronizing block 8 to rotate and controlling the extension and retraction of the movable ring tooth 2-13. When it is necessary to cut the soil to collect the soil core, the movable ring tooth 2-13 slides upwards to contact the bottom of the inner tube 2-1, which can stably cut the soil.

[0043] When it is necessary to remove the sampling mechanism 2 from the soil, the sliding rod 2-3 rotates in the opposite direction. At this time, the movable ring tooth 2-13 can move downward and insert into the soil, so that the outer tube 2-2 can be more stable and will not cause relative rotation to cause the upper soil core and the lower soil core to rotate and break the soil core.

[0044] The pressure plate 6 includes a trapezoidal block 6-2, a first stop block 6-3, and a second stop block 6-4. The bottom of the pressure plate 6 is provided with an annular plate, and a groove 6-1 is provided on the annular plate. One end of the groove 6-1 is provided with the trapezoidal block 6-2 and the first stop block 6-3, and the other end of the groove 6-1 is provided with the second stop block 6-4. The first stop block 6-3 is located below the trapezoidal block 6-2, and the sliding rod 2-3 is located below the groove 6-1.

[0045] In this embodiment, when the pressure plate 6 rotates in the forward direction, the inclined surface on the trapezoidal block 6-2 presses the first U-shaped block 2-7, causing the first U-shaped block 2-7 to compress the spring downward. As the pressure plate 6 continues to rotate in the forward direction, the first U-shaped block 2-7 moves to the bottom of the trapezoidal block 6-2 and contacts the first stop block 6-3. The first stop block 6-3 pushes the first U-shaped block 2-7 to rotate in the circumferential direction of the inner circle, thereby causing the inner and outer tubes 2-2 to rotate synchronously. This allows the sampling mechanism 2 to rotate while moving downward. The bottom cutting ring tooth 2-4 of the sampling mechanism 2 can also cut the soil to collect soil cores.

[0046] When the pressure plate 6 rotates in the reverse direction, the first U-shaped block 2-7 disengages from the first stop block 6-3 and the trapezoidal block 6-2, causing the sliding rod 2-3 to reset and contact the second stop block 6-4. At this time, the pressure plate 6 continues to rotate, causing the second stop block 6-4 to push the first U-shaped block 2-7 to rotate in the reverse direction, locking the sliding rod 2-3 and preventing all the inner circles from rotating relative to each other on the circumferential surface. During the reversal of the first U-shaped block 2-7, the bottom movable ring tooth 2-13 can extend and insert into the soil, keeping the outer tube 2-2 in a more stable state during the reversal of the first U-shaped block 2-7. This prevents the outer tube 2-2 from rubbing against the inner wall of the outer tube 2-2 during the reversal of the first U-shaped block 2-7, which could cause relative rotation of the outer tube 2-2 and breakage of the soil core.

[0047] The outer surface of the top of the threaded sleeve 4 is provided with a first gear 9, which is located above the base 1. A second gear 10 is provided on one side of the first gear 9. The second gear 10 is adapted to the first gear 9. A motor is provided on the top of the second gear 10, and the motor is mounted on the bracket 11. The bracket 11 is fixedly connected to the base 1.

[0048] In this embodiment, after the sliding rod 2-3 is locked, the pressure plate 6 can be removed. The motor drives the second gear 10 to drive the first gear 9 to rotate, causing the threaded sleeve 4 to reverse and drive the outer tube 2-2 to reverse. When the inner wall surface of the outer tube 2-2 contacts the sliding rod 2-3, it pushes the sliding rod 2-3 to drive the inner tube 2-1 to move synchronously until the sampling mechanism 2 is removed.

[0049] The technical scope of this invention is not limited to the contents of the above specification. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the scope of this invention.

Claims

1. A directional coring device for soil contamination site investigation, characterized in that, The system includes a base (1) and a sampling mechanism (2). The base (1) is an annular disc. Both sides of the base (1) are equipped with hydraulic cylinders (3), and the output ends of the hydraulic cylinders (3) on both sides face upward. A fixed ring (5) is installed at the center of the base (1). A threaded sleeve (4) is rotatably installed at the center of the fixed ring (5). The bottom end of the threaded sleeve (4) passes through the fixed ring (5), and the top end is located above the base (1). The sampling mechanism (2) is set inside the threaded sleeve (4), and the bottom of the sampling mechanism (2) passes through the threaded sleeve (4). A pressure plate (6) is set at the top of the sampling mechanism (2). A motor is set at the top of the pressure plate (6) and is installed at the center of the connecting plate (7). The bottom ends of both ends of the connecting plate (7) are fixedly connected to the output ends of the hydraulic cylinders (3) on both sides of the base (1). The sampling mechanism (2) includes an inner tube (2-1), an outer tube (2-2), a sliding insert rod (2-3), and a cutting ring tooth (2-4). The sampling mechanism (2) is configured as a multi-layer splicing installation, with the first layer of the sampling mechanism (2) located at the bottom and the top sampling mechanism (2) in contact with the pressure plate (6). The middle part of the sliding rod (2-3) is an elastic telescopic rod. A first sliding groove (2-6) is provided on the outer wall of the inner tube (2-1). A movable ring (2-5) is slidably arranged in the first sliding groove (2-6). The sliding rod (2-3) is arranged in the movable ring (2-5). The top of the sliding rod (2-3) is a first U-shaped block (2-7). The top of the two vertical sections of the first U-shaped block (2-7) is rotatably equipped with pulleys (2-8). The bottom of the sliding rod (2-3) is provided with a limit block (2-11). The bottom of the first U-shaped block (2-7) is provided with a second sliding groove (2-9). The bottom of the outer wall of the second inner tube (2-1) is provided with an extension rod (2-10). The groove opening of the second sliding groove (2-9) is provided with an inclined surface. The interior of the second sliding groove (2-9) is provided with a vertical section. When the extension rod (2-10) enters the vertical section from the groove opening of the second sliding groove (2-9), the first U-shaped block (2-7) is reset. At this time, the first U-shaped block (2-7) is locked by the extension rod (2-10). All the sliding rods (2-3) are locked, so that all the inner tubes (2-1) are integrated and cannot rotate relative to each other.

2. A directional coring device for soil contamination site investigation as claimed in claim 1, wherein, The cutting ring teeth (2-4) are located at the bottom of the sampling mechanism (2) in the first layer. The outer wall of the outer tube (2-2) is provided with threads, which are adapted to the threads on the inner ring of the threaded sleeve (4). The inner tube (2-1) is located inside the outer tube (2-2). A gap is provided between the outer tube (2-2) and the inner tube (2-1). The sliding insert (2-3) is located in the gap.

3. A directional coring device for soil contamination site investigation as claimed in claim 1, wherein, The cutting ring tooth (2-4) includes a fixed sleeve (2-12) and a movable ring tooth (2-13). The fixed sleeve (2-12) is disposed at the bottom of the outer wall of the first layer of the outer tube (2-2), and the movable ring tooth (2-13) is slidably disposed on the inner wall surface of the fixed sleeve (2-12).

4. A directional coring device for soil contamination site investigation as claimed in claim 3, wherein, A synchronizing block (8) is provided between the movable ring tooth (2-13) and the fixed sleeve (2-12), and the synchronizing block (8) can contact the upper limiting block (2-11).

5. A directional coring device for soil contamination site investigation as claimed in claim 4, wherein, The top of the synchronization block (8) is provided with a second U-shaped block (8-1), the bottom of the synchronization block (8) is provided with a plug rod (8-3), the side of the synchronization block (8) away from the plug rod (8-3) is fixedly provided with a T-shaped block (8-2), the inner wall of the fixed sleeve (2-12) is provided with a third sliding groove (2-14), the T-shaped block (8-2) is slidably connected with the third sliding groove (2-14), and the outer wall of the movable ring tooth (2-13) is provided with an inclined groove (2-15).

6. A directional coring device for soil contamination site investigation as claimed in claim 1, wherein, The pressure plate (6) includes a trapezoidal block (6-2), a first stop block (6-3), and a second stop block (6-4). The bottom of the pressure plate (6) is provided with an annular plate, and a groove (6-1) is provided on the annular plate. One end of the groove (6-1) is provided with the trapezoidal block (6-2) and the first stop block (6-3), and the other end of the groove (6-1) is provided with the second stop block (6-4). The first stop block (6-3) is located below the trapezoidal block (6-2), and the sliding rod (2-3) is located below the groove (6-1).

7. A directional coring device for soil contamination site investigation as claimed in claim 1, wherein, The outer surface of the top of the threaded sleeve (4) is provided with a first gear (9), which is located above the base (1). A second gear (10) is provided on one side of the first gear (9), which is adapted to the first gear (9). A motor is provided on the top of the second gear (10), and the motor is mounted on the bracket (11). The bracket (11) is fixedly connected to the base (1).

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