A deep soil sampling device for soil carbon sequestration survey

Abstract

This invention belongs to the field of soil sampling technology and discloses a deep soil sampling device for soil carbon sequestration surveys, including a telescopic frame, a drill rod, a sampling mechanism, a pressing mechanism, an elastic blocking plate, and a drive mechanism. The drill rod includes a drill pipe, spiral blades, and a drill bit detachably connected to the bottom end of the drill pipe. The upper part of the drill pipe is rotatably connected to the telescopic frame. The sampling mechanism includes a mounting plate fixed to the bottom end of the drill pipe. Each sampling component includes a protective component, a reset component, and a sampling component, with the sampling component placed inside the protective component via the reset component. The pressing mechanism is located inside the drill pipe, with its movable end passing through an insertion hole on the mounting plate to push the sampling component out of the drill bit's sidewall for sampling. The elastic blocking plate is embedded in the outer wall of the drill bit, being pushed open during sampling and automatically closing after sampling. The drive mechanism is mounted on the telescopic frame and is used to drive the drill rod to rotate and drill. This invention eliminates the need for repeated drilling and lowering, enabling continuous multi-depth sampling in a single drilling operation, ensuring sample purity, and significantly improving sampling efficiency.

Description

Technical Field

[0001] This invention belongs to the field of soil sampling technology, and in particular relates to a deep soil sampling device for soil carbon sequestration investigation. Background Technology

[0002] Soil carbon sequestration surveys refer to the process of scientifically and accurately estimating and assessing soil carbon sequestration capacity. In the process of soil carbon sequestration surveys, deep soil sampling is often required.

[0003] Currently, most existing deep soil sampling devices are cylindrical structures with an opening at the bottom for collecting soil. Soil is collected into the device by inserting the sampling device into the ground.

[0004] However, in existing technologies, when soil samples need to be taken from different depths at the same location, it is usually necessary to first drill to the first depth, remove the drill rig and take samples, then reinstall the drill rig and continue drilling to the second depth, and then remove the drill rig again for stratified sampling, until all samples are collected. This operation method is not only cumbersome and inefficient, but also makes it difficult to ensure that the locations of the drilled holes are completely consistent, which disrupts the spatial correspondence between samples at different depths and makes it impossible to form continuous soil profile data.

[0005] Therefore, there is a need to provide a deep soil sampling device for soil carbon sequestration surveys to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a deep soil sampling device for soil carbon sequestration surveys, so as to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides a deep soil sampling device for soil carbon sequestration investigation, comprising: Telescopic frame; The drill pipe includes a drill tube, a spiral blade, and a drill bit detachably connected to the bottom end of the drill tube. The spiral blade is fixedly wound around the outer wall of the drill tube, and the upper part of the drill tube is rotatably connected to the telescopic frame. The sampling mechanism includes a mounting plate fixedly connected to the bottom end of the drill pipe, and a plurality of sampling components are arranged circumferentially at the bottom end of the mounting plate. The sampling component includes a protective component, a reset component, and a sampling component, wherein the sampling component is placed inside the protective component via the reset component; A pressure-reducing mechanism is located inside the drill pipe, with its movable end passing through an insertion hole on the mounting plate, allowing the sampling component to extend out of the protective component and the side wall of the drill bit for sampling. An elastic blocking plate is fitted into the outer wall of the drill bit to close the opening on the side wall of the drill bit through which the sampler passes when the sampler is not extended, and to be pushed open when the sampler is extended. The drive mechanism is mounted on the telescopic frame and is used to drive the drill rod to drill holes in the soil.

[0008] Optionally, the protective component includes a storage tube connected to the top of the mounting plate, the top of the storage tube having a through hole, the through hole being coaxially arranged and communicating with the insertion hole.

[0009] Optionally, the sampling component includes a sampling tube coaxially disposed on the receiving tube, with a gap between the sampling tube and the inner wall of the receiving tube, an opening provided on the side wall of the sampling tube along its length, and serrations provided around the bottom end face of the sampling tube.

[0010] Optionally, the reset component includes a limiting rod symmetrically arranged on the outer wall of the sampling tube, and a corresponding elongated hole adapted to the limiting rod is provided on the side wall of the receiving tube. The limiting rod passes through the elongated hole and is connected to one end of a tension spring, and the other end of the tension spring is fixedly connected to the upper part of the receiving tube.

[0011] Optionally, the top pressure mechanism includes a rotating rod coaxially rotatably connected inside the drill pipe. The top end of the rotating rod extends out of the top end of the drill pipe and is equipped with a calibration disc assembly. The other end of the rotating rod is provided with a telescopic component and is aligned with the corresponding sampling element through the calibration disc assembly.

[0012] Optionally, the calibration disc assembly includes a mounting base coaxially fixedly connected to the top end of the drill pipe, a rotating rod rotatably connected to the mounting base, a handwheel connected to its top end, and a pointer connected to the outer wall of the rotating rod, the pointer being configured to correspond to the angle disc mounted on the mounting base.

[0013] Optionally, the elastic stopper includes a baffle hinged to the side wall of the drill bit, and a torsion spring is provided on the rotating shaft. The baffle is in contact with the drill bit through the torsion spring, which can close the protrusion of the sampling tube.

[0014] Optionally, a strong magnet is provided at the top of the sampling tube, and the strong magnet is provided in correspondence with the insertion hole.

[0015] Optionally, the telescopic frame includes a base, on which a plurality of first slide rods are equally spaced along the circumference of the drill pipe. A first support plate is slidably connected to the plurality of first slide rods. A first spring is slidably sleeved on the first slide rods, and the first spring is located between the first support plate and the base. A plurality of second slide rods are equally spaced along the circumference of the drill pipe on the top surface of the first support plate. A second support plate is slidably connected to the plurality of second slide rods. A second spring is slidably sleeved on the second slide rods, and the second spring is located between the second support plate and the first support plate.

[0016] Optionally, the drive mechanism includes a motor mounted on the second support plate, the output shaft of the motor is connected to a drive sprocket, and a driven sprocket is fixedly sleeved on the drill pipe. The driven sprocket is connected to the drive sprocket via a chain.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: This invention integrates the sampling mechanism inside the drill pipe. During drilling, once the drill rod reaches a target depth, there is no need to lift and remove it. The sampling component can be directly extended from the drill bit sidewall by the top-pressing mechanism for sampling. After sampling, the sampling component automatically retracts under the action of the reset component, and the elastic plug seals the protrusion. The drill rod can then continue drilling downwards to the next target depth for sampling again. Throughout the entire process, the drill rod remains inside the borehole, eliminating the need for repeated lifting and lowering of the drill. This achieves a highly efficient working mode of single-drilling, continuous operation, and multiple sampling, significantly reducing operation time and labor intensity. It is particularly suitable for rapid collection of large quantities of samples at multiple depths in soil carbon sequestration surveys.

[0018] This invention ensures that the drill rod remains inside the borehole throughout the entire drilling process, eliminating the need for repeated lifting and lowering. This effectively prevents soil from collapsing from the borehole wall and contaminating the drill pipe. Simultaneously, the sampling component retracts completely into the protective structure when not in use, and the elastic sealing plate automatically seals the protrusion on the drill bit sidewall after sampling. This effectively isolates soil exchange between different depths, ensuring that samples taken from each depth are in-situ soil from that depth. This eliminates cross-contamination between samples from different depths and guarantees the accuracy and reliability of soil carbon sequestration survey data. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1This is a schematic diagram of the structure of a deep soil sampling device for soil carbon sequestration investigation proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of the drill pipe in this invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a top view of the mounting plate in this invention; The components are as follows: 1. Base; 2. Ground insert; 3. First slide rod; 4. First spring; 5. First support plate; 6. Second spring; 7. Second slide rod; 8. Motor; 9. Drive sprocket; 10. Chain; 11. Handwheel; 12. Rotating rod; 13. Pointer; 14. Angle disc; 15. Mounting base; 16. Driven sprocket; 17. Spiral blade; 18. Drill pipe; 19. Telescopic component; 20. Drill bit; 21. Opening; 22. Sampling tube; 23. Mounting plate; 24. Insertion hole; 25. Strong magnet; 26. Tension spring; 27. Limiting rod; 28. Long slot; 29. ​​Storage tube; 30. Baffle; 31. Second support plate. Detailed Implementation

[0020] 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.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figures 1 to 4 As shown, the present invention provides a deep soil sampling device for soil carbon sequestration investigation, comprising: Telescopic frame; The drill pipe includes a drill tube 18, a spiral blade 17, and a drill bit 20 detachably connected to the bottom end of the drill tube 18. The spiral blade 17 is fixedly wound around the outer wall of the drill tube 18, and the upper part of the drill tube 18 is rotatably connected to the telescopic frame. The sampling mechanism includes a mounting plate 23 fixedly connected to the bottom end of the drill pipe 18, and multiple sampling components are arranged circumferentially at the bottom end of the mounting plate 23. The sampling component includes a protective component, a reset component, and a sampling component, with the sampling component placed inside the protective component via the reset component. The top pressure mechanism is located inside the drill pipe 18. Its movable end passes through the insertion hole 24 on the mounting plate 23, so that the sampling component extends out of the protective component and the side wall of the drill bit 20, and performs sampling. An elastic blocking plate is embedded in the outer wall of the drill bit 20 to close the opening on the side wall of the drill bit 20 for the sample to pass through when the sample is not extended, and to be pushed open when the sample is extended. The drive mechanism is mounted on the telescopic frame and is used to drive the drill rod to drill holes in the soil.

[0023] In use, the drive mechanism is activated to rotate the drill rod and drill to the target depth. After reaching the predetermined depth, the top-pressing mechanism is operated so that its movable end passes downward through the through hole at the top of the insertion hole 24 and the receiving tube 29, pushes against the top of the sampling component, overcomes the binding force of the reset component, slides downward, pushes open the elastic blocking plate, and inserts into the surrounding soil to complete the collection of soil samples at that depth. After sampling, the movable end of the top-pressing mechanism retracts, and the sampling component retracts into the protective component under the action of the reset component. The elastic blocking plate automatically resets and seals the protrusion of the drill bit 20. Then, the drill rod can continue to drill downward to the next target depth without lifting. The above top-pressing and sampling operations are repeated to achieve continuous multi-depth fixed-point sampling in one drilling operation. After all sampling is completed, the drill rod is lifted and the drill bit is disassembled to remove the sampling component, thereby completing the deep soil stratification sampling operation efficiently, accurately, and without pollution.

[0024] Furthermore, the protective component includes a storage tube 29 connected to the top of the mounting plate 23. The top of the storage tube 29 has a through hole, which is coaxially arranged and connected with the insertion hole 24.

[0025] By fixing the storage tube 29 to the bottom of the mounting plate 23, and making the through hole at the top of the storage tube 29 coaxial with and connected to the insertion hole 24 on the mounting plate 23, it is ensured that the moving end of the pressing mechanism can accurately enter the storage tube 29 in a straight line, avoiding jamming or wear caused by skewness, and improving the reliability and repeatability of the pressing operation.

[0026] Furthermore, the sampling component includes a sampling tube 22 coaxially disposed on the receiving tube 29, with a gap between the sampling tube 22 and the inner wall of the receiving tube 29, an opening 21 being provided on the side wall of the sampling tube 22 along its length, and serrations being provided around the bottom end face of the sampling tube 22.

[0027] After sampling is completed, the sampling tube 22 can be taken out from the drill pipe 18, and the columnar soil sample inside can be taken out completely through the open port 21 without knocking or cutting open the sampling tube 22. This avoids the problems of sample extraction difficulties and sample breakage, mixing or structural disturbance during the extraction process in traditional sampling devices, ensuring the original stratification structure and integrity of the soil sample, which is beneficial to the accuracy of subsequent soil carbon content analysis.

[0028] When the sampling tube 22 extends out of the side wall of the drill bit 20 and inserts into the surrounding soil, the saw teeth can make a ring cut on the soil, reducing the squeezing resistance of the soil on the end of the sampling tube 22, making it easier for the sampling tube 22 to cut into the dense soil layer. At the same time, the columnar soil core formed by the saw teeth can be completely inserted into the inner cavity of the sampling tube 22, avoiding the soil sample from being crushed or compacted due to squeezing when entering the tube opening, thus ensuring the structural integrity and in-situ nature of the sample.

[0029] Furthermore, the reset component includes a limiting rod 27 symmetrically arranged on the outer wall of the sampling tube 22, and a long waist hole 28 adapted to the limiting rod 27 is correspondingly opened on the side wall of the receiving tube 29. The limiting rod 27 passes through the long waist hole 28 and is connected to one end of a tension spring 26. The other end of the tension spring 26 is fixedly connected to the upper part of the receiving tube 29.

[0030] After the limiting rod 27 passes through the elongated hole 28, the elongated hole 28 limits the up and down movement of the limiting rod 27. This not only restricts the maximum extension distance of the sampling tube 22, preventing the sampling tube 22 from over-extending and detaching from the receiving tube 29, but also limits the maximum retraction position of the sampling tube 22, ensuring that the bottom end of the sampling tube 22 is completely retracted into the receiving tube 29 without exceeding the inner wall of the drill bit 20. At the same time, the elongated hole 28 also acts as a guide, allowing the limiting rod 27 to slide only in the axial direction, effectively preventing the sampling tube 22 from rotating circumferentially, and ensuring that the serrated edge at the bottom end of the sampling tube 22 maintains the same orientation angle each time it extends.

[0031] After the top pressure is released, the tension spring 26 uses its own elastic restoring force to pull the sampling tube 22 upward through the limit rod 27, thereby realizing the automatic reset of the sampling tube 22. The tension of the tension spring 26 can also keep the sampling tube 22 in a retracted state when it is not in operation, preventing the sampling tube 22 from accidentally sliding out due to vibration or gravity. At the same time, the tension spring 26 is symmetrically arranged on both sides of the sampling tube 22, ensuring that the force on both sides of the sampling tube 22 is uniform during the reset process, and avoiding reset deviation.

[0032] Furthermore, the top pressure mechanism includes a rotating rod 12 coaxially rotatably connected inside the drill pipe 18. The top end of the rotating rod 12 extends out of the top end of the drill pipe 18 and is equipped with a calibration disc assembly. The other end of the rotating rod 12 is provided with a telescopic member 19, which is aligned with the corresponding sampling member through the calibration disc assembly.

[0033] In this embodiment, the telescopic member 19 is a hydraulic telescopic rod.

[0034] The rotating rod 12 is coaxially rotatably connected inside the drill pipe 18, allowing it to rotate independently of the drill pipe 18 without interference. This ensures normal drilling operations are not affected and allows for easy adjustment of the sampling position after drilling is completed. The top of the rotating rod 12 extends beyond the top of the drill pipe 18 and is equipped with a calibration disc assembly. Operators on the ground can precisely control the position of the hydraulic telescopic rod at the bottom of the rotating rod 12 via the calibration disc assembly. Hydraulic drive provides a stable, sufficient, and controllable jacking force, ensuring the sampling tube 22 can smoothly penetrate the compacted soil layer for sampling. The calibration disc assembly is used to align the sampling tube with the drill pipe 12. The corresponding sampling component enables selective driving of sampling tubes 22 at different orientations within the same depth. Operators only need to rotate the rotating rod 12 at the top of the drill rod and use the calibration disc assembly for positioning to ensure that the movable end of the hydraulic telescopic rod is precisely aligned with the corresponding insertion hole 24 on the mounting plate 23 and the sampling tube 22 below. This allows for independent, fixed-point sampling of soil at different orientations within a single borehole at the same depth, without the need to lift the drill or rotate the entire drill rod. This significantly improves the flexibility of sampling and the accuracy of orientation control, providing a reliable basis for continuous sampling at multiple depths and orientations within the same borehole.

[0035] Furthermore, the calibration disc assembly includes a mounting base 15 coaxially fixedly connected to the top end of the drill pipe 18, a rotating rod 12 rotatably connected to the mounting base 15, a handwheel 11 connected to its top end, and a pointer 13 connected to the outer wall of the rotating rod 12, the pointer 13 being configured to correspond with the angle disc 14 mounted on the mounting base 15.

[0036] Mounting base 15 is coaxially fixedly connected to the top of drill pipe 18, providing a stable mounting base for the calibration disc assembly and ensuring a fixed circumferential relative position between it and drill pipe 18. This ensures that the scale markings on angle disc 14 always correspond one-to-one with the actual orientation of drill pipe 18, improving the reliability of orientation indication. Rotary rod 12 is rotatably connected to mounting base 15, allowing it to rotate relative to mounting base 15 and drill pipe 18 while maintaining axial positioning. This achieves rotation of rod 12 while ensuring precise fit with mounting base 15, preventing wobbling or offset during rotation. It should be noted that rod 12 establishes a rotational relationship with mounting base 15 through a damping bearing. The handwheel 11 connected to the top of rod 12 provides a convenient rotational operation interface for the operator, eliminating the need for additional tools. The rotating rod 12 can be easily rotated, meeting the convenience requirements of field operations. The pointer 13 connected to the outer wall of the rotating rod 12 is set to correspond to the angle disk 14 installed on the mounting base 15. When the rotating rod 12 rotates, the pointer 13 rotates synchronously and indicates the circumferential angle position corresponding to the telescopic component 19 at the bottom of the rotating rod 12 on the angle disk 14. By observing the correspondence between the pointer 13 and the scale line of the angle disk 14, the operator can quickly, intuitively and accurately adjust the telescopic component 19 to the position of the target sampling tube 22, realizing the visual and precise positioning of the sampling position. This effectively avoids the positional deviation caused by visual inspection or experience judgment, ensuring that each jacking operation can be accurately aligned with the predetermined sampling component, thus providing a reliable guarantee for the accuracy and repeatability of continuous sampling at multiple depths and in multiple directions within the same borehole.

[0037] Furthermore, the elastic baffle includes a baffle 30 hinged to the side wall of the drill bit 20, and a torsion spring is provided on the rotating shaft. The baffle 30 fits against the drill bit 20 through the torsion spring, which can seal the protrusion of the sampling tube 22.

[0038] The baffle 30 is hinged to the side wall of the drill bit 20, allowing it to rotate around the hinge axis. It is pushed open when the sampling tube 22 extends, and automatically rotates back after sampling due to the elastic restoring force provided by the torsion spring on the rotating shaft. Automatic opening and closing of the protrusion is achieved without additional power or manual intervention. The baffle 30 is attached to the drill bit 20 via the torsion spring. In the non-sampling state, the preload of the torsion spring ensures that the baffle 30 is tightly attached to the outer wall of the drill bit 20, effectively sealing the protrusion on the side wall of the drill bit 20 through which the sampling tube 22 passes. This reliably prevents external soil particles, gravel, and mud from entering the drill pipe 18 during drilling, thus preventing contamination of the drill pipe 18. The cavity is contaminated or blocked, ensuring the cleanliness of the inside of the sampling tube 22 and the receiving tube 29. When the sampling tube 22 extends, the baffle 30 is pushed outward by the bottom end of the sampling tube 22 to overcome the torsion spring force and open, making way for the sampling channel. After the sampling tube 22 retracts, the torsion spring automatically drives the baffle 30 to reset and close. This not only prevents the collected samples from falling off or being squeezed from the protrusion during the drilling or lifting of the drill rod, but also effectively isolates the soil exchange between soil layers at different depths, avoiding cross-contamination of samples caused by soil intrusion. Thus, in a single drilling operation with continuous multi-depth sampling, it provides a reliable guarantee for the in-situ nature and purity of the samples at each depth.

[0039] Furthermore, a strong magnet 25 is provided at the top of the sampling tube 22, and the strong magnet 25 is correspondingly provided with the insertion hole 24.

[0040] To ensure that the sampling tube 22 retracts reliably into the storage tube 29, a strong magnet 25 is used to connect the sampling tube 22 to the telescopic end of the telescopic component 19, and the sampling tube 22 is pulled back into the storage tube 29 by the telescopic component 19.

[0041] Furthermore, the telescopic frame includes a base 1, on which a plurality of first slide rods 3 are equally spaced along the circumference of the drill pipe 18. A first support plate 5 is slidably connected to the plurality of first slide rods 3. A first spring 4 is slidably sleeved on the first slide rods 3, and the first spring 4 is located between the first support plate 5 and the base 1. A plurality of second slide rods 7 are equally spaced along the circumference of the drill pipe 18 on the top surface of the first support plate 5. A second support plate 31 is slidably connected to the plurality of second slide rods 7. A second spring 6 is slidably sleeved on the second slide rods 7, and the second spring 6 is located between the second support plate 31 and the first support plate 5.

[0042] In this embodiment, in order to improve the stability of the base 1, a ground plug 2 is used to fix it to the ground.

[0043] The base 1 provides stable support; multiple first slide rods 3 and second slide rods 7 form a double-layer guide, constraining the vertical movement of the drill rod and preventing deflection; the first support plate 5 and the second support plate 31 slide along their corresponding slide rods; the first spring 4 and the second spring 6 provide two-stage progressive buffering, absorbing drilling vibrations, adaptively adjusting the downward pressure, and avoiding rigid impacts. The double-layer guide and double-layer springs work together to ensure a smooth drilling process, improve depth control accuracy and repeatability, ensure the long-term stable operation of the drill rod and sampling components, and provide a reliable mechanical foundation for continuous multi-depth sampling in a single drilling operation.

[0044] Furthermore, the drive mechanism includes a motor 8 mounted on the second support plate 31, the output shaft of the motor 8 is connected to a drive sprocket 9, and a driven sprocket 16 is fixedly sleeved on the drill pipe 18. The driven sprocket 16 is connected to the drive sprocket 9 via a chain 10.

[0045] The motor 8 is fixed on the second support plate 31 and sinks synchronously with the drill rod to ensure that the transmission is always aligned. The output shaft of the motor 8 is connected to the drive sprocket 9, and the power is transmitted to the driven sprocket 16 fixed on the drill pipe 18 through the chain 10, providing reliable and continuous power output for the continuous rotation of the drill rod for drilling and multiple depth sampling.

[0046] The deep soil sampling device for soil carbon sequestration survey provided by this invention has the following working principle: I. Drilling Stage: Place the base 1 on the ground to be sampled and start the motor 8. The output shaft of the motor 8 drives the drive sprocket 9 to rotate, and the drive sprocket 9 drives the driven sprocket 16 to rotate via the chain 10. The driven sprocket 16 is fixedly sleeved on the drill pipe 18, so the drill pipe 18 rotates accordingly. The drill pipe 18 drives the spiral blades 17 fixedly wound around its outer wall and the drill bit 20 detachably connected to the bottom end of the drill pipe 18 to rotate together. During rotation, the operator presses down on the second support plate 31, and the drill rod gradually drills into the soil under the combined action of rotational force and downward pressure. The double-layer buffer structure consisting of the first slide bar 3 and the first spring 4, the second slide bar 7 and the second spring 6 can provide stable guidance and vibration reduction during drilling. The spiral blades 17 transport the cut soil upwards and discharges it, while the drill bit 20 continues to advance into the deeper soil until the preset target sampling depth is reached.

[0047] II. Sampling and Positioning Stage: After the drill rod reaches the target depth, the motor 8 is turned off to stop drilling. At this time, the operator adjusts the rotation angle of the rotating rod 12 by turning the handwheel 11. As the rotating rod 12 rotates, the pointer 13 connected to its outer wall rotates accordingly. The operator observes the position indicated by the pointer 13 on the angle disc 14 mounted on the mounting base 15 and rotates the pointer 13 to the angle scale corresponding to the target sampling tube 22. Since multiple sampling tubes 22 are evenly arranged circumferentially along the bottom end of the mounting plate 23, each sampling tube 22 has a unique angular position in the circumferential direction. Therefore, through the cooperation of the pointer 13 and the angle disc 14, the telescopic part 19 at the bottom end of the rotating rod 12 can be precisely aligned with the corresponding insertion hole 24 and sampling tube 22. If multiple samples need to be collected from different locations at the same depth, the rotating rod 12 can be rotated sequentially to align with different sampling tubes 22 for sampling.

[0048] III. Sampling Stage: After the rotating rod 12 is aligned with the target sampling tube 22, the telescopic component 19 at the bottom of the rotating rod 12 is activated. The movable end of the telescopic component 19 extends downward, passing through the insertion hole 24 on the mounting plate 23 and the through hole at the top of the receiving tube 29. The movable end continues to move downward, pushing against the top of the sampling tube 22. Under the action of the pushing force, the sampling tube 22 overcomes the tension of the tension spring 26 and slides downward along the inner wall of the receiving tube 29. The limiting rod 27 moves downward synchronously within the elongated hole 28, guiding and limiting the movement of the sampling tube 22.

[0049] The bottom end of the sampling tube 22 passes through the protrusion on the side wall of the drill bit 20, pushing open the baffle 30 of the elastic stop plate. The baffle 30 rotates around the hinge axis, overcoming the elastic force of the torsion spring and opening. The sampling tube 22 continues to extend outward, and the serrations around its bottom end face insert into the soil around the drill bit 20, cutting the soil. The soil sample enters the interior of the sampling tube 22 under the pushing action of the sampling tube 22. Because there is a gap between the sampling tube 22 and the inner wall of the receiving tube 29, the extension and retraction of the sampling tube 22 are smooth and unobstructed.

[0050] After sampling is completed, the movable end of the telescopic component 19 retracts upwards, and it is magnetically connected to the top of the sampling tube 22 via a strong magnet 25, causing the sampling tube 22 to retract into the receiving tube 29. At the same time, the tension spring 26 pulls the sampling tube 22 upwards through the limiting rod 27, assisting the sampling tube 22 to retract into the receiving tube 29. After the sampling tube 22 is reset, the movable end of the telescopic component 19 continues to retract, forcibly separating it from the strong magnet 25. As the sampling tube 22 retracts into the receiving tube 29, the baffle 30 automatically resets under the action of the torsion spring, re-attaches to the outer wall of the drill bit 20, and seals the protrusion to prevent external soil from entering the drill pipe 18, while also preventing the collected sample from falling during the drill rod lifting process.

[0051] IV. Sample Retrieval Stage: After sampling at all target depths and orientations is completed, the motor 8 is started in reverse or the drill rod is pulled upwards to remove it from the soil. The drill bit 20 is disassembled, and the sampling tube 22 is removed from the drill tube 18. Because the sampling tube 22 has an opening 21 along its length on its side wall, the operator can easily and completely remove the soil sample through the opening 21, avoiding the problems of difficult sample removal or damage during removal found in traditional sampling devices. If a strong magnet 25 is installed at the top of the sampling tube 22, it can also be pulled out of the receiving tube 29 using a magnetic tool, further facilitating operation.

[0052] V. Multiple Sampling Stage: If sampling at different depths is required, after sampling at the current depth, the drill rod can be continued to drill down to the next target depth, repeating the sampling positioning and sampling stages described above, thus achieving stratified sampling at different depths. Because multiple sampling tubes 22 are arranged circumferentially, and with the precise positioning of the calibration disc assembly, multiple parallel samples can be collected from different locations at the same depth, thereby improving the accuracy and representativeness of soil carbon sequestration survey data.

[0053] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0054] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A deep soil sampling device for soil carbon sequestration survey, characterized in that, include: Telescopic frame; The drill pipe includes a drill tube (18), a spiral blade (17) and a drill bit (20) detachably connected to the bottom end of the drill tube (18). The spiral blade (17) is fixedly wound around the outer wall of the drill tube (18), and the upper part of the drill tube (18) is rotatably connected to the telescopic frame. The sampling mechanism includes a mounting plate (23) fixedly connected to the bottom end of the drill pipe (18), and a plurality of sampling components are arranged circumferentially at the bottom end of the mounting plate (23); The sampling component includes a protective component, a reset component, and a sampling component, wherein the sampling component is placed inside the protective component via the reset component; The top pressure mechanism is located inside the drill pipe (18), and its movable end passes through the insertion hole (24) on the mounting plate (23) so that the sampling component extends out of the protective component and the side wall of the drill bit (20) and performs sampling; An elastic blocking plate is fitted into the outer wall of the drill bit (20) to close the opening on the side wall of the drill bit (20) for the sampler to pass through when the sampler is not extended, and to be pushed open when the sampler is extended. The drive mechanism is mounted on the telescopic frame and is used to drive the drill rod to drill holes in the soil.

2. The deep soil sampling device for soil carbon sequestration investigation according to claim 1, characterized in that, The protective component includes a storage tube (29) connected to the top of the mounting plate (23). The top of the storage tube (29) has a through hole, which is coaxially arranged and connected with the insertion hole (24).

3. The deep soil sampling device for soil carbon sequestration investigation according to claim 2, characterized in that, The sampling component includes a sampling tube (22) coaxially disposed on the receiving tube (29). A gap is provided between the sampling tube (22) and the inner wall of the receiving tube (29). An opening (21) is provided on the side wall of the sampling tube (22) along its length direction. A serration is provided around the bottom end face of the sampling tube (22).

4. The deep soil sampling device for soil carbon sequestration investigation according to claim 3, characterized in that, The reset component includes a limiting rod (27) symmetrically arranged on the outer wall of the sampling tube (22). The side wall of the receiving tube (29) is provided with a long waist hole (28) adapted to the limiting rod (27). The limiting rod (27) passes through the long waist hole (28) and is connected to one end of a tension spring (26). The other end of the tension spring (26) is fixedly connected to the upper part of the receiving tube (29).

5. The deep soil sampling device for soil carbon sequestration investigation according to claim 1, characterized in that, The top pressure mechanism includes a rotating rod (12) coaxially rotatably connected inside the drill pipe (18). The top end of the rotating rod (12) extends out of the top end of the drill pipe (18) and is equipped with a calibration disc assembly. The other end of the rotating rod (12) is provided with a telescopic member (19) and is aligned with the corresponding sampling member through the calibration disc assembly.

6. The deep soil sampling device for soil carbon sequestration investigation according to claim 5, characterized in that, The calibration disc assembly includes a mounting base (15) coaxially fixedly connected to the top of the drill pipe (18), a rotating rod (12) rotatably connected to the mounting base (15), a handwheel (11) connected to its top, a pointer (13) connected to the outer wall of the rotating rod (12), and the pointer (13) corresponding to the angle disc (14) installed on the mounting base (15).

7. The deep soil sampling device for soil carbon sequestration investigation according to claim 3, characterized in that, The elastic baffle includes a baffle (30) hinged to the side wall of the drill bit (20), and a torsion spring is provided on the rotating shaft. The baffle (30) is in contact with the drill bit (20) through the torsion spring, which can close the protrusion of the sampling tube (22).

8. The deep soil sampling device for soil carbon sequestration investigation according to claim 3, characterized in that, A strong magnet (25) is provided at the top of the sampling tube (22), and the strong magnet (25) is provided in correspondence with the insertion hole (24).

9. The deep soil sampling device for soil carbon sequestration investigation according to claim 1, characterized in that, The telescopic frame includes a base (1), on which a plurality of first slide rods (3) are equally spaced along the circumference of the drill pipe (18). A first support plate (5) is slidably connected to the plurality of first slide rods (3). A first spring (4) is slidably sleeved on the first slide rods (3). The first spring (4) is located between the first support plate (5) and the base (1). A plurality of second slide rods (7) are equally spaced along the circumference of the drill pipe (18) on the top surface of the first support plate (5). A second support plate (31) is slidably connected to the plurality of second slide rods (7). A second spring (6) is slidably sleeved on the second slide rods (7). The second spring (6) is located between the second support plate (31) and the first support plate (5).

10. The deep soil sampling device for soil carbon sequestration investigation according to claim 9, characterized in that, The drive mechanism includes a motor (8) mounted on the second support plate (31), the output shaft of the motor (8) is connected to a drive sprocket (9), and a driven sprocket (16) is fixedly sleeved on the drill pipe (18). The driven sprocket (16) is connected to the drive sprocket (9) through a chain (10).

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