Directional coring device for soil pollution condition investigation

Abstract

The invention belongs to the technical field of sampling and collection, and particularly relates to a directional coring device for soil pollution condition investigation, the directional coring device comprises a base and a sampling mechanism, the base is an annular disc, oil cylinders are installed on the two sides of the base, the output ends of the oil cylinders on the two sides face upwards, a fixing ring is installed at the center of the base, and the sampling mechanism is arranged on the fixing ring. A threaded sleeve is rotatably installed at the center of the fixing ring, the bottom end of the threaded sleeve penetrates through the fixing ring, the sampling mechanism is arranged in the threaded sleeve, the bottom of the sampling mechanism penetrates through the threaded sleeve, a pressing disc is arranged at the top of the sampling mechanism, a motor is arranged at the top of the pressing disc, and the motor is installed at the center of a connecting plate; the sampling mechanism has the advantages that when the pressing disc rotates forwards, all the layers of sampling mechanisms can rotate synchronously, when the pressing disc rotates backwards, all the layers of sampling mechanisms are stable in state and do not rotate mutually, and it is guaranteed that a soil core can be kept complete and does not break during coring.

Description

Technical Field

[0001] The present invention belongs to the technical field of sampling and collection. Specifically, the present invention relates to a directional coring device for soil pollution status investigation. Background Art

[0002] Soil pollution investigation sampling is a key step in evaluating the soil pollution status. Soil samples are collected vertically from the surface to depths ranging from several meters to dozens of meters underground and experimentally analyzed for the content of pollution factors to determine whether the soil is polluted. The main objectives of coring include identifying the types and concentrations of pollutants, determining the pollution range, and providing data support for health and ecological risk assessment. Common sampling methods include surface sampling, borehole sampling, and profile sampling, which are respectively applicable to shallow, deep, and detailed research. Sampling equipment includes manual samplers, mechanical drills, and automatic samplers, which are suitable for sampling requirements of different depths and complexities.

[0003] For example, the invention patent with the authorized publication number CN118190508B provides a soil sampling and detection device for geological survey, including a base. The middle part of the inner curved surface of the base is fixedly sleeved with a fixed ring, and the middle part of the inner curved surface of the fixed ring is fixedly sleeved with a threaded sleeve. The threaded sleeve is fixedly sleeved with the inner curved surface of the base, and the inner curved surface of the threaded sleeve is provided with threads. The upper surface of the base is circumferentially and equidistantly provided with a plurality of support columns. The upper part of the inner curved surface of the plurality of support columns is fixedly installed with a mounting seat, and the middle part of the mounting seat is fixedly installed with a rotating sleeve. By reducing the air pressure between the lower part of the ring plug in the inner cavity of the ring cavity and the air-permeable membrane, the deep hard soil in the middle of the air-permeable membrane is tightly adsorbed on the inner curved surface of the air-permeable membrane, thus solving the problem that when the existing integrated coring bit cores deep soil, due to insufficient friction between the soil core and the inner curved surface of the coring bit, the coring bit cannot carry the soil core to separate from the soil and the soil core will break at any position in the inner cavity of the coring bit, resulting in coring failure.

[0004] However, by setting the interaction of multiple sampling mechanisms to reduce the air pressure inside the sampling mechanism, relative rotation will occur between the upper sampling mechanism and the lower sampling mechanism, resulting in a risk of breakage of the soil core between the upper sampling mechanism and the lower sampling mechanism. In summary, there is still room for improvement in the device. 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 problems existing in the prior art.

[0006] To achieve the foregoing object, the present invention provides a directional coring device for soil pollution status investigation, comprising a base and a sampling mechanism. The base is a ring-shaped disc, and oil cylinders are installed on both sides of the base, with the output ends of the oil cylinders on both sides facing upward. 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 the top end is located above the base. The sampling mechanism is arranged inside the threaded sleeve, and the bottom of the sampling mechanism passes through the threaded sleeve. A pressing plate is arranged at the top of the sampling mechanism, and a motor is arranged at the top of the pressing plate and installed at the center of the connecting plate. The bottom ends of both ends of the connecting plate are fixedly connected to the output ends of the oil cylinders on both sides of the base.

[0007] In a directional coring device for soil pollution status investigation as described above, optionally, the sampling mechanism includes an inner tube, an outer tube, a sliding insertion rod, and a cutting ring gear. The sampling mechanism is arranged in a multi-layer splicing installation. The first layer of the sampling mechanism is arranged at the bottommost, and the top layer of the sampling mechanism is in contact with the pressing plate. The cutting ring gear is arranged at the bottom of the first layer of the sampling mechanism. Threads are arranged on the outer wall of the outer tube and are adapted to the threads on the inner ring of the threaded sleeve. The inner tube is arranged inside the outer tube, and a gap is arranged between the outer tube and the inner tube. The sliding insertion rod is arranged in the gap.

[0008] In a directional coring device for soil pollution status investigation as described above, optionally, the middle part of the sliding insertion rod is an elastic telescopic rod. First sliding grooves are opened on the outer wall of the inner tube, and movable rings are slidably arranged in the first sliding grooves. The sliding insertion rod is arranged inside the movable rings.

[0009] In a directional coring device for soil pollution status investigation as described above, optionally, the top of the sliding insertion rod is a first U-shaped block. Pulleys are rotatably installed at the tops of the two vertical sections of the first U-shaped block. A limiting block is arranged at the bottom of the sliding insertion rod. A second sliding groove is arranged below the first U-shaped block, and an extension rod is arranged at the bottom of the outer wall of the second layer of the inner tube.

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

[0011] In a directional coring device for soil pollution status investigation as described above, optionally, a synchronous block is arranged between the movable ring gear and the fixed sleeve, and the synchronous block can contact the upper limiting block.

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

[0013] In the directional coring device for soil pollution condition investigation as described above, optionally, the pressing disc includes a trapezoidal block, a first stop block and a second stop block, a ring plate is provided at the bottom of the pressing disc, a groove is formed on the ring plate, one end of the groove is provided with the trapezoidal block and the first stop block, the other end of the groove is provided with the second stop block, the first stop block is located below the trapezoidal block, and the sliding plug rod is located below the groove.

[0014] In the directional coring device for soil pollution condition investigation as described above, 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 installed on a bracket, and the bracket is fixedly connected to the base.

[0015] The directional coring device for soil pollution condition investigation of the present invention adopts a assembled sampling mechanism and the setting of inner and outer pipes. The cutting ring gear at the bottom of the outer pipe cuts the soil to obtain the soil core, and the inner pipe collects and stores the soil core. Through the sliding plug rod, all the inner pipes form a whole when the inner pipe cuts and withdraws from the sampling mechanism, and there is no relative rotation between them, maintaining the integrity of the soil core, and controlling the cutting ring gear to insert into the soil so that during the process of cutting and switching to withdrawing the sampling mechanism, the outer pipe is always in a stable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Referring to the accompanying drawings, the disclosure of the present invention will be more obvious. It should be understood that these drawings are only for the purpose of illustration and are not intended to limit the protection scope of the present invention. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 is a schematic diagram of the overall structure of the sampling mechanism of the present invention.

[0018] Figure 3 is a sectional view of the inner pipe and the outer pipe of the present invention.

[0019] Figure 4 is a schematic diagram of the inner pipe connection structure of the present invention.

[0020] Figure 5 This is a sectional view of the inner tube of the present invention.

[0021] Figure 6 This is a schematic diagram of the cutting ring tooth connection structure of the present invention.

[0022] Figure 7 This is a schematic diagram of the connection structure of the pressure plate of the present invention.

[0023] Reference numerals: 1, base; 2, sampling mechanism; 2-1, inner tube; 2-2, outer tube; 2-3, sliding insertion rod; 2-4, cutting ring teeth; 2-5, movable ring; 2-6, first chute; 2-7, first U-shaped block; 2-8, pulley; 2-9, second chute; 2-10, extension rod; 2-11, limit block; 2-12, fixed sleeve; 2-13, movable ring teeth; 2-14, third chute; 2-15, inclined chute; 3, oil cylinder; 4, threaded sleeve; 5, fixed 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 manners

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figures 1 to 7 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 a ring-shaped disc. Oil cylinders 3 are installed on both sides of the base 1, and the output ends of the oil 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 arranged in the threaded sleeve 4, and the bottom of the sampling mechanism 2 passes through the threaded sleeve 4. A pressure plate 6 is arranged at the top of the sampling mechanism 2. A motor is arranged at the top of the pressure plate 6 and is installed at the center of the connecting plate 7. The two ends of the bottom of the connecting plate 7 are fixedly connected to the output ends of the oil cylinders 3 on both sides of the base 1.

[0026] In this embodiment, the base 1 is placed on the ground where detection and sampling are required. The frustum above the base 1 is a hollow structure. The fixing ring 5 between the two brackets 11 on both sides of the frustum is located above the frustum. The middle area of the threaded sleeve 4 is located between the frustum and the fixing ring 5. The bottom extension of the threaded sleeve 4 is located in the hollow area at the center of the frustum of the base 1. The top extension of the threaded sleeve 4 is located inside 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 to drive the pressure plate 6 to rotate, 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 makes the sampling mechanism 2 move downward while rotating, so that the sampling mechanism 2 can penetrate from the ground surface into the soil, thereby being able to collect soil cores.

[0027] The sampling mechanism 2 includes an inner tube 2-1, an outer tube 2-2, a sliding insertion rod 2-3, and a cutting ring tooth 2-4. The sampling mechanism 2 is a spliced sampling mechanism 2, which is provided with multiple layers. The first-layer sampling mechanism 2 is arranged at the bottommost layer, and the top sampling mechanism 2 is in contact with the pressure plate 6. The cutting ring tooth 2-4 is arranged at the bottom of the first-layer sampling mechanism 2. Threads are arranged on the outer wall of the outer tube 2-2 and are adapted to the threads on the inner ring of the threaded sleeve 4. The inner tube 2-1 is arranged inside the outer tube 2-2, and a gap is arranged between the outer tube 2-2 and the inner tube 2-1. The sliding insertion rod 2-3 is arranged in the gap.

[0028] In this embodiment, the sampling mechanism 2 adopts a multi-layer spliced structure. When deep soil sampling is required, only by increasing the number of layers of the sampling mechanism 2 can the drilling depth be increased. There is no need to prepare a very long drill bit, and the transportation is convenient. The drilling depth can be flexibly adjusted. The sliding insertion 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.

[0029] The middle part of the sliding insertion rod 2-3 is an elastic telescopic rod. A first sliding groove 2-6 is opened on the outer wall of the inner tube 2-1, and a movable ring 2-5 is slidably arranged in the first sliding groove 2-6. The sliding insertion rod 2-3 is arranged inside the movable ring 2-5.

[0030] In this embodiment, the sliding insertion 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 insertion rod 2-3 slides to the maximum distance, the sliding insertion rod 2-3 can drive the inner tube 2-1 to rotate in its own circumferential direction. When the sliding insertion rod 2-3 slides to the maximum distance, the sliding insertion rod 2-3 contacts the inner wall surface of the gap between the outer tube 2-2, so that the sliding insertion rod 2-3 can drive the inner tube 2-1 and the outer tube 2-2 to rotate together in their own circumferential directions.

[0031] The sliding plug rod 2-3 is provided with a first U-shaped block 2-7 at the top. At the top of the two vertical sections of the first U-shaped block 2-7, pulleys 2-8 are rotatably installed. A limiting block 2-11 is provided at the bottom of the sliding plug rod 2-3. A second chute 2-9 is provided below the first U-shaped block 2-7. An extension rod 2-10 is provided at the bottom of the outer wall of the second-layer inner tube 2-1.

[0032] 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. After the first-section sampling mechanism 2 drills into the soil and when the second-section sampling mechanism 2 needs to be installed, the upper and lower sampling mechanisms 2 can be aligned with the first U-shaped block 2-7 on the sliding plug rod 2-3 as the reference position. When the pressure plate 6 pushes the sliding plug rod 2-3 to rotate clockwise, the pressure plate 6 squeezes the top sliding plug rod 2-3, causing the first U-shaped block 2-7 at the top of the top sliding plug rod 2-3 to compress the spring to the maximum distance. Then, continue to squeeze the top sliding plug rod 2-3 so that the limiting block 2-11 at the bottom of the sliding plug rod 2-3 squeezes the lower first U-shaped block 2-7, causing the lower first U-shaped block 2-7 to be squeezed, and in turn causing all the sliding plug rods 2-3 to be compressed, so that all the sliding plug rods 2-3 maintain a stable state and rotate to the maximum distance to push the inner and outer tubes 2-2 to rotate synchronously. When the sampling mechanism 2 needs to be taken out of the soil, the pressure plate 6 rotates in the reverse direction, causing the pressure of the pressure plate 6 on the top sliding plug rod 2-3 to disappear. The upper first U-shaped block 2-7 bounces up and resets, causing the pressure on the limiting block 2-11 to disappear, and the lower first U-shaped block 2-7 resets in turn. At this time, the pressure plate 6 pushes the first U-shaped block 2-7 of the top sliding plug rod 2-3, causing all the sliding plug rods 2-3 to rotate in the reverse direction to the maximum distance. When the notch of the second chute 2-9 passes over the extension rod 2-10, the inclined surface of the second chute 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 the vertical section of the second chute 2-9. The first U-shaped block 2-7 resets. At this time, the first U-shaped block 2-7 is locked by the extension rod 2-10, and all the sliding plug rods 2-3 are locked, making all the inner tubes 2-1 form a whole and unable to rotate relative to each other. At this time, the pressure plate 6 continues to push the top sliding plug rod 2-3, causing the sliding plug rod 2-3 to push the inner and outer tubes 2-2 to rotate synchronously in the reverse direction in the locked state until the sampling mechanism 2 is completely taken out. All the inner tubes 2-1 remain in a stable state, so that the soil core remains intact during the process of taking out the sampling mechanism 2 and will not break in any inner tube 2-1, resulting in the failure of core sampling.

[0033] The cutting ring teeth 2-4 include a fixed sleeve 2-12 and a movable ring tooth 2-13. The fixed sleeve 2-12 is provided at the bottom of the outer wall of the first-layer outer tube 2-2. The movable ring tooth 2-13 is slidably arranged on the inner wall surface of the fixed sleeve 2-12.

[0034] In this embodiment, the fixed ring 5 is fixedly installed at the bottom of the outer wall surface of the first-layer outer tube 2-2. The movable ring teeth 2-13 can slide up and down within the fixed sleeve 2-12. When cutting the soil, the movable ring teeth 2-13 move upward to contact the bottom surface of the first-layer inner tube 2-1, stably cutting the soil to collect the soil core. When it is necessary to take out the sampling mechanism from the soil, reversely rotating the sliding insertion rod 2-3 can cause all the inner tubes 2-1 and outer tubes 2-2 to rotate synchronously; When the sliding insertion rod 2-3 does not contact the inner wall of the gap of the outer tube 2-2, the frictional force between the sliding insertion rod 2-3 and the inner tube 2-1 and the outer tube 2-2 may cause relative rotation between the outer tube 2-2 and the inner tube 2-1. At this time, the movable ring teeth 2-13 can move downward and insert into the soil, making the outer tube 2-2 more stable and preventing relative rotation from driving the rotation between the upper soil core and the lower soil core, resulting in the fracture of the soil core.

[0035] A synchronization block 8 is arranged between the movable ring teeth 2-13 and the fixed sleeve 2-12, and the synchronization block 8 can contact the upper limiting block 2-11.

[0036] In this embodiment, the limiting block 2-11 can be clamped into the synchronization 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, causing the movable ring teeth 2-13 to slide up and down on the inner wall surface of the fixed ring 5, controlling the expansion and contraction of the movable ring teeth 2-13.

[0037] A second U-shaped block 8-1 is arranged at the top of the synchronization block 8, a insertion rod 8-3 is arranged at the bottom end of the synchronization block 8, a T-shaped block 8-2 is fixedly arranged on the side of the synchronization block 8 away from the insertion rod 8-3. A third sliding groove 2-14 is formed on the inner wall surface of the fixed sleeve 2-12, and the T-shaped block 8-2 is slidably connected with the third sliding groove 2-14. An inclined groove 2-15 is formed on the outer wall surface of the movable ring teeth 2-13, and the end of the insertion rod 8-3 away from the T-shaped block 8-2 is arranged in the inclined groove 2-15.

[0038] In this embodiment, the T-shaped block 8-2 can slide in the third sliding groove 2-14, enabling the synchronization block 8 to rotate in the circumferential direction of the inner circle, thereby driving the insertion rod 8-3 to rotate in the circumferential direction of the inner circle inside the inclined groove 2-15, causing the insertion rod 8-3 to press the top surface of the inclined groove 2-15, making the movable ring teeth 2-13 slide upward on the inner wall surface of the fixed sleeve 2-12. The limiting block 2-11 can be clamped into the second U-shaped block 8-1. When the pressure plate 6 rotates and the sliding insertion rod 2-3 rotates in a compressed state, the limiting block 2-11 at the bottom of the sliding insertion rod 2-3 stably pushes the second U-shaped block 8-1 to rotate in the circumferential direction of the inner circle in a pressing state, thereby driving the synchronization block 8 to rotate, controlling the expansion and contraction of the movable ring teeth 2-13. When it is necessary to cut the soil to collect the soil core, the movable ring teeth 2-13 slide upward to contact the bottom of the inner tube 2-1, and can stably cut the soil; When it is necessary to take out the sampling mechanism 2 from the soil, the sliding plug rod 2-3 rotates in the reverse direction. At this time, the movable ring gear 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 relatively to drive the rotation between the upper soil core and the lower soil core, causing the soil core to break.

[0039] The pressing disc 6 includes a trapezoidal block 6-2, a first stop block 6-3 and a second stop block 6-4. An annular plate is arranged at the bottom of the pressing disc 6, and a groove 6-1 is formed in 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 plug rod 2-3 is located below the groove 6-1.

[0040] In this embodiment, when the pressing disc 6 rotates forward, the inclined surface on the trapezoidal block 6-2 squeezes the first U-shaped block 2-7, so that the first U-shaped block 2-7 compresses the spring downward. Continuing to rotate the pressing disc 6 forward, the first U-shaped block 2-7 is displaced below 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 the first U-shaped block 2-7 in the circumferential direction of the inner circle, so that the inner and outer tubes 2-2 rotate synchronously, and the sampling mechanism 2 rotates and moves downward at the same time. The cutting ring gear 2-4 at the bottom of the sampling mechanism 2 can cut the soil to collect the soil core at the same time; When the pressing disc 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, so that the sliding plug rod 2-3 resets and contacts the second stop block 6-4. At this time, the pressing disc 6 continues to flip so that the second stop block 6-4 pushes the first U-shaped block 2-7 to rotate in the reverse direction, so that the sliding plug rod 2-3 is locked, so that all the inner circles cannot rotate relatively on the circumferential surface. During the reverse rotation of the first U-shaped block 2-7, the bottom movable ring gear 2-13 can extend and insert into the soil, so that during the reverse rotation of the first U-shaped block 2-7, the outer tube 2-2 is kept in a more stable state, preventing the inner wall of the outer tube 2-2 from being rubbed during the reverse rotation of the first U-shaped block 2-7, causing the problem that the outer tube 2-2 rotates relatively and the soil core breaks.

[0041] A first gear 9 is arranged on the outer surface of the top of the threaded sleeve 4. The first gear 9 is located above the base 1. A second gear 10 is arranged on one side of the first gear 9. The second gear 10 is adapted to the first gear 9. A motor is arranged on the top of the second gear 10, and the motor is installed on the bracket 11. The bracket 11 is fixedly connected to the base 1.

[0042] In this embodiment, after the sliding plug rod 2-3 is locked, the pressure plate 6 can be removed, and the motor drives the second gear 10 to drive the first gear 9 to rotate, so that the threaded sleeve 4 rotates in reverse to drive the outer tube 2-2 to rotate in reverse. When the inner wall surface of the outer tube 2-2 contacts the sliding plug rod 2-3, it pushes the sliding plug rod 2-3 to drive the inner tube 2-1 to move synchronously until the sampling mechanism 2 is taken out.

[0043] The technical scope of the present invention is not limited to the content in the above specification. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the scope of the present invention.

Claims

1. A directional coring device for soil pollution status investigation, characterized in that, It includes a base (1) and a sampling mechanism (2). The base (1) is an annular disc. Oil cylinders (3) are installed on both sides of the base (1), and the output ends of the oil cylinders (3) on both sides face upward. A fixing ring (5) is installed at the center of the base (1). 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 arranged inside the threaded sleeve (4), and the bottom of the sampling mechanism (2) passes through the threaded sleeve (4). A pressure plate (6) is arranged at the top of the sampling mechanism (2). A motor is arranged at the top of the pressure plate (6) and is installed at the center of the connecting plate (7). The two ends of the bottom of the connecting plate (7) are fixedly connected to the output ends of the oil cylinders (3) on both sides of the base (1).

2. The directional coring device for soil pollution status investigation according to claim 1, wherein, The sampling mechanism (2) includes an inner tube (2-1), an outer tube (2-2), a sliding insertion rod (2-3), and a cutting ring gear (2-4). The sampling mechanism (2) is arranged in a multi-layer splicing installation. The first layer of the sampling mechanism (2) is arranged at the bottommost part, and the top sampling mechanism (2) is in contact with the pressure plate (6). The cutting ring gear (2-4) is arranged at the bottom of the first layer of the sampling mechanism (2). Threads are arranged on the outer wall of the outer tube (2-2) and are adapted to the threads on the inner ring of the threaded sleeve (4). The inner tube (2-1) is arranged inside the outer tube (2-2). A gap is arranged between the outer tube (2-2) and the inner tube (2-1). The sliding insertion rod (2-3) is arranged in the gap.

3. The directional coring device for soil pollution status investigation according to claim 2, characterized in that, The middle part of the sliding insertion rod (2-3) is an elastic telescopic rod. A first sliding groove (2-6) is opened 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 insertion rod (2-3) is arranged inside the movable ring (2-5).

4. The directional coring device for soil pollution status investigation according to claim 3, characterized in that, The top of the sliding insertion rod (2-3) is a first U-shaped block (2-7). Pulleys (2-8) are rotatably installed at the tops of the two vertical sections of the first U-shaped block (2-7). A limiting block (2-11) is arranged at the bottom of the sliding insertion rod (2-3). A second sliding groove (2-9) is arranged below the first U-shaped block (2-7). An extension rod (2-10) is arranged at the bottom of the outer wall of the second layer of the inner tube (2-1).

5. The directional coring device for soil pollution status investigation according to claim 4, characterized in that, The cutting ring gear (2-4) includes a fixed sleeve (2-12) and a movable ring gear (2-13). The fixed sleeve (2-12) is arranged at the bottom of the outer wall of the first layer of the outer tube (2-2). The movable ring gear (2-13) is slidably arranged on the inner wall surface of the fixed sleeve (2-12).

6. The directional coring device for soil pollution status investigation according to claim 5, wherein A synchronous block (8) is arranged between the movable ring gear (2-13) and the fixed sleeve (2-12). The synchronous block (8) can be in contact with the upper limiting block (2-11).

7. The directional coring device for soil pollution status investigation according to claim 6, characterized in that, A second U-shaped block (8-1) is provided at the top of the synchronization block (8). A plug rod (8-3) is provided at the bottom end of the synchronization block (8). A T-shaped block (8-2) is fixedly provided on the side of the synchronization block (8) away from the plug rod (8-3). A third chute (2-14) is formed on the inner wall surface of the fixed sleeve (2-12). The T-shaped block (8-2) is slidably connected to the third chute (2-14). An inclined groove (2-15) is formed on the outer wall surface of the movable ring gear (2-13).

8. The directional coring device for soil pollution status investigation according to claim 4, characterized in that, The pressure plate (6) includes a trapezoidal block (6-2), a first stop block (6-3) and a second stop block (6-4). A ring plate is provided at the bottom of the pressure plate (6). A groove (6-1) is formed in the ring plate. One end of the groove (6-1) is provided with the trapezoidal block (6-2) and the first stop block (6-3). 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). The sliding plug rod (2-3) is located below the groove (6-1).

9. The directional coring device for soil pollution status investigation according to claim 4, wherein, A first gear (9) is provided on the outer surface of the top of the threaded sleeve (4). The first gear (9) 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 installed on the bracket (11). The bracket (11) is fixedly connected to the base (1).

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