Sampling device for earth science shallow geological research

Abstract

The invention relates to the technical field of sampling devices, and discloses an earth science shallow geological research sampling device which comprises a drill pipe, an annular groove is formed in the inner wall of the side, close to a drill bit of the drill pipe, of the drill pipe, a plugging assembly used for plugging an opening is connected into the annular groove, and the plugging assembly comprises a twisting disc, a sliding disc, a plurality of elastic pieces and a plugging part. The sliding disc is of an annular structure and is slidably connected to the lower portion in the annular groove in the longitudinal direction, an annular containing cavity is formed in the upper surface of the annular groove located in the bottom of the sliding disc, and the multiple elastic pieces are all arranged in the containing cavity. The plugging part comprises a plurality of longitudinally-arranged hollow cylindrical unit cells and traction ropes arranged in the middle of the unit cells, the unit cells are evenly and tightly distributed between the twisting disc and the sliding disc, and the upper ends and the lower ends of the unit cells and the upper ends and the lower ends of the traction ropes are fixedly connected with the twisting disc and the sliding disc respectively. The effect of cutting and plugging soil at the opening of the drill pipe can be achieved, and the soil structure is prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, in particular to a sampling device for shallow geological research in earth science. Background Art

[0002] Sampling for geological research is a relatively important task in geological research, which includes research on environmental and ecological protection. It is used to study the geological conditions and migration paths of shallow soil pollution such as heavy metals and organic matter. Through screening, sedimentation and other methods, the proportion of sand, silt and clay in the soil is analyzed, the soil texture such as sand, loam, clay, etc. is judged, its permeability, water retention and aeration are evaluated, the soil moisture content is measured, and the soil moisture retention and transmission capacity are studied. At the same time, soil microorganisms such as bacteria, fungi, and actinomycetes are studied, and their effects on organic matter decomposition, nutrient cycling and pollutant degradation are analyzed. Heavy metals or pollutants are studied to evaluate the properties of geological soils. The accuracy of the test data for geological shallow soil research depends on whether the soil is representative and has hierarchical integrity. The integrity of its hierarchy reflects important conditions such as the distribution of microorganisms in the actual bottom layer. Therefore, soil sampling is particularly important.

[0003] At present, inspectors will determine representative sampling locations based on environmental factors such as terrain and vegetation distribution. After the sampling points are determined, soil sampling devices will be used to achieve hierarchical sampling of soil at different depths at the sampling points. Usually, mechanical sampling is used for sampling deep soil, and sampling of shallow soil layers is usually achieved by manpower due to portability. The commonly used soil sampling devices are similar in structure, including a hollow drill pipe with an external thread on the outer surface and an open lower end, and a sampling tube arranged in the drill pipe for storing soil samples. The lower end face of the drill pipe is a diamond raised drill bit. The upper end of the mechanized drill pipe is usually provided with a drive assembly for driving it to rotate and feed vertically. The upper end of the handheld drill pipe is provided with a rotating handle, etc. Regardless of whether it is used mechanically or manually, the sampling tube will be coaxially inserted into the drill pipe, and the drill pipe will be rotated to drill vertically, so that the soil enters the sampling tube in sequence.

[0004] Since the bottom of the existing soil sampling tube is hollow, the soil at the bottom of the sampling tube is still connected to the soil in the stratum after the sampling tube is filled with soil. When the drill tube is pulled upward after the sampling tube is filled with soil, the soil in the stratum is integrally connected to the soil at the tube mouth of the sampling tube, and the soil in the bottom layer pulls the soil at the bottom of the sampling tube downward, causing the soil sample at the bottom tube mouth of the sampling tube to partially fall off. Moreover, when the humidity of the soil is low, as the drill tube moves upward, the friction between its tube wall and the inner wall of the stratum borehole generates vibration, causing cracks in the soil and damage to the micro-layer structure. As a result, the sample soil cannot reflect the real and complete layered structure in the bottom layer, which is not conducive to the subsequent accurate detection and analysis of various parameters of the soil. Summary of the Invention

[0005] The present invention provides a sampling device for shallow geological research in earth science, which can achieve the effect of cutting and sealing the soil at the opening of a drill pipe, thereby preventing the soil structure from being destroyed.

[0006] The invention provides a sampling device for shallow geological research in earth science, comprising a drill pipe, an annular groove is formed on the inner wall of one side of the drill pipe near the drill bit, and a sealing assembly for sealing the opening is connected in the annular groove, the sealing assembly comprising: a torsion disc, a sliding disc, a plurality of elastic members, and a sealing portion. The torsion disc is an annular structure, which is rotatably connected to the upper portion of the annular groove, the sliding disc is an annular structure, which is longitudinally slidably connected to the lower portion of the annular groove, an annular placement cavity is formed on the upper surface of the annular groove at the bottom of the sliding disc, the plurality of elastic members are all placed in the placement cavity, and the upper and lower ends are respectively fixedly connected to the sliding disc and the bottom wall of the placement cavity to increase the resistance of the sliding disc to move upward, the sealing portion comprises a plurality of longitudinally arranged and hollow cylindrical unit cells and a pulling rope arranged in the middle of the unit cells, the unit cells are made of rubber, and the unit cells are evenly and tightly distributed between the torsion disc and the sliding disc, the upper and lower ends of the unit cells and the upper and lower ends of the pulling rope are respectively fixedly connected to the torsion disc and the sliding disc. As the torsion disc rotates, the unit cells deform and twist to seal the lower opening of the drill pipe.

[0007] Preferably, the interior of each unit cell is a sealed cavity.

[0008] Preferably, the length of the unit cell is greater than or equal to the inner ring diameter of the torsion disc, and the length of the pulling rope is less than or equal to the length of the unit cell in an unextended state.

[0009] Preferably, a plurality of sliding grooves are longitudinally formed on the inner wall of the drill pipe located in the annular groove, and a plurality of sliding blocks sliding along the sliding grooves are fixedly connected to the position of the sliding plate corresponding to each sliding groove.

[0010] Preferably, step grooves are provided on the lower surface of the torsion plate and the upper surface of the sliding plate at positions corresponding to each unit cell, and fixing parts are connected to the upper and lower ends of the unit cell. The fixing parts fix the unit cell by connecting to the step grooves, and the pulling rope is detachably connected to the fixing parts.

[0011] Preferably, the fixing member includes a step pin, the outer diameter of the step pin close to the unit cell is smaller than the inner diameter of the unit cell, and an annular concave cavity is opened at the end of the step pin, the end of the unit cell is sleeved on the step pin and rolled inward into the concave cavity, and the unit cell is fixed to the step pin by a plurality of circumferentially distributed pins.

[0012] Preferably, an internal thread groove is provided at the end of the step pin, a nut is threadedly connected to the internal thread groove, a special-shaped hole is provided on the nut along the longitudinal direction, and a special-shaped clamping block is fixed on the end of the pulling rope. The clamping block can be staggered and engaged with the special-shaped hole after passing through the special-shaped hole and rotating.

[0013] Preferably, an annular rotating groove is provided through the inner wall of the drill pipe above the torsion disk to separate the drill pipe into an inner tube and an outer tube. A driving part for controlling the rotation of the torsion disk is provided in the rotating groove, and the driving part comprises: a connecting disk, two connecting rods, and a rotating cap. The connecting disk is rotatably connected to the rotating groove, and the connecting disk is fixedly connected to the upper surface of the torsion disk. The inner tube and the outer tube are located above the connecting disk and fixedly connected by a block. The two connecting rods are both fixedly connected to the upper surface of the connecting disk. The upper end of the connecting rod extends out of the drill pipe. The rotation angle of the connecting rod is 150° to 180°. A clamping piece for clamping the connecting rod is connected to the block. The rotating cap is rotatably connected to the upper end of the drill pipe, and the upper ends of the connecting rods are fixedly connected to the rotating cap.

[0014] Preferably, the two blocks are relatively distributed on the same radial straight line in the rotating groove, and the two blocks are located in a longitudinal direction with a bayonet for placing the connecting rod. When the unit cell is deformed and twisted to block the lower opening of the drill pipe, the connecting rod rotates and is clamped into the corresponding bayonet. The protruding part of the bayonet is a plastic or metal material that can be deformed and reset and has a certain strength.

[0015] Preferably, the pulling rope is made of metal or cotton material.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the soil layers sampled by the device are complete, and the lower opening of the drill pipe is closed by the sealing component, which can cut off the connection between the sample and the stratum, avoiding slippage when pulling, ensuring the integrity of soil layer sampling, and meeting the earth science demand for accurate detection of soil layer parameters. Specifically, the device not only has the function of sealing the opening, but also can assist in cutting the soil by increasing the upward resistance of the sliding disk with the help of the pulling rope and the elastic part, and the pulling rope can greatly enhance the support of the unit cell for the sampled soil sample to prevent the soil sample from collapsing. The torsion disk of the device rotates to drive the sealing The plug does not require a complex mechanical structure and is suitable for conventional drilling equipment. The rubber cell has both elasticity and wear resistance, and the plug has better sealing performance and is adaptable to different soil textures such as clay, sand, etc. The structure is not complicated and has strong practicality. It is easy to produce and manufacture. Through its structural innovation and functional integration, even when the drill pipe inevitably rubs against the inner wall of the stratum borehole to produce vibration, the remaining soil sample in the sampling tube will not slip, and the soil sample can be completely sampled in layers, which is also conducive to the subsequent accurate detection of various parameters of the soil, providing a more reliable technical tool for earth science research.

[0017] Specifically, when sampling is completed, the torsion disk is rotated by external force, and the rotation of the torsion disk drives the upper part of the unit cell to twist, while the lower part is limited by the sliding disk and remains fixed. The middle parts of the unit cells approach each other due to the twisting. At this time, the positions of the pulling ropes following the twisting of the unit cells near the middle are twisted and approached. In this process, the sliding disk will be pulled upward only in the longitudinal direction. Under the action of the tension provided by the elastic members, the pulling ropes can be kept taut, and the taut twisting of the pulling ropes is used to achieve an auxiliary cutting effect on the soil. When the pulling ropes complete the extrusion and cutting of the soil, the unit cells will also form a twisted and retracted state, forming a "shrink valve"-like structure, thereby utilizing the elastically tight and tightly connected surfaces of the unit cells to achieve a sealing effect on the lower opening of the drill pipe. After the drill pipe is lifted to the soil layer, the torsion disk can be rotated in the opposite direction to open the opening and take out the complete soil structure layer. The elastic members will provide downward pulling force for the sliding disk, and also rely on the elasticity of the unit cells to eventually restore the unit cells and the pulling ropes to their original state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic cross-sectional view of a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention; Figure 2 A schematic diagram of the cross-sectional front-side structural perspective of a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention; Figure 3 A schematic diagram of the internal structure of a unit cell in a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention; Figure 4 for Figure 3 A partial enlarged view of part A; Figure 5 A schematic diagram of a partial explosion structure of a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention; Figure 6 A schematic diagram of the top-down structural view of a unit cell in a state of deformation and blocking in a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a bayonet in a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention; Figure 8 A schematic structural diagram of a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention in a unit cell deformation and blocking state from a top-down perspective; Figure 9 A schematic structural diagram of a special-shaped hole and a block in a sampling device for shallow geological research in earth sciences provided by an embodiment of the present invention.

[0019] Description of reference numerals: 1. Drill pipe; 11. Annular groove; 111. Placement cavity; 12. Slide groove; 13. Rotation groove; 2. Sealing assembly; 21. Torsion plate; 211. Step groove; 22. Sliding plate; 23. Elastic member; 24. Sealing part; 241. Unit cell; 242. Pull rope; 3. Slider; 4. Step pin; 41. Concave cavity; 42. Internal thread groove; 5. Nut; 51. Special-shaped hole; 52. Block; 6. Driving part; 61. Connecting plate; 62. Block; 621. Bayonet; 63. Connecting rod; 64. Rotation cap. DETAILED DESCRIPTION

[0020] A specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] refer to Figure 1 、 Figure 2 and Figure 3 The present invention provides a sampling device for shallow geological research in earth science, including a drill pipe 1. The inner wall of the drill pipe 1 near the drill bit is provided with an annular groove 11. A sealing component 2 for sealing the opening is connected in the annular groove 11. The sealing component 2 includes: a torsion disc 21, a sliding disc 22, a plurality of elastic members 23, and a sealing portion 24. The torsion disc 21 is an annular structure, which is rotatably connected to the upper part of the annular groove 11. The sliding disc 22 is an annular structure, which is longitudinally slidably connected to the lower part of the annular groove 11. An annular placement cavity 111 is provided on the upper surface of the annular groove 11 at the bottom of the sliding disc 22. The plurality of elastic members 23 are all It is placed in the placement cavity 111, and the upper and lower ends are fixedly connected to the sliding disk 22 and the bottom wall of the placement cavity 111 respectively to increase the resistance of the sliding disk 22 to move upward. The blocking portion 24 includes a plurality of longitudinally arranged hollow cylindrical cells 241 and a pulling rope 242 arranged in the middle of the cell 241. The cell 241 is made of rubber. Each cell 241 is evenly and tightly distributed between the torsion disk 21 and the sliding disk 22. The upper and lower ends of the cell 241 and the upper and lower ends of the pulling rope 242 are fixedly connected to the torsion disk 21 and the sliding disk 22 respectively. As the torsion disk 21 rotates, the cell 241 deforms and twists to block the lower opening of the drill pipe 1.

[0023] In the above embodiments, the soil layer sampled by the device is complete, and the lower opening of the drill pipe 1 is closed by the sealing component 2, which can cut off the connection between the sample and the stratum, avoid slippage during pulling, ensure the integrity of soil layer sampling, and meet the earth science demand for accurate detection of soil layer parameters. Specifically, the device not only has the function of sealing the opening, but also can assist in cutting the soil by increasing the upward resistance of the sliding disk 22 with the help of the pulling rope 242 and the elastic member 23, and the pulling rope 242 can greatly enhance the support of the unit cell 241 for the sampled soil sample to prevent the soil sample from collapsing. The torsion disk 21 of the device rotates to drive the sealing The plug does not require a complex mechanical structure and is suitable for conventional drilling equipment. The rubber cell 241 has both elasticity and wear resistance, and the plug has better sealing performance and is adaptable to different soil textures such as clay, sand, etc. The structure is not complicated and has strong practicality. It is easy to produce and manufacture. Through its structural innovation and functional integration, even if the drill pipe 1 inevitably rubs against the inner wall of the stratum borehole to generate vibration, the remaining soil sample in the sampling tube will not slip, and the soil sample can be completely sampled in layers, which is also conducive to the subsequent accurate detection of various parameters of the soil, providing a more reliable technical tool for earth science research.

[0024] Specifically, when the sampling is completed, the torsion disk 21 is rotated by external force, and the rotation of the torsion disk 21 drives the upper part of the cell 241 to twist, and the lower part is limited by the sliding disk 22 and remains fixed. The middle parts of the cell 241 are close to each other due to the twisting. At this time, the positions of the pulling ropes 242 following the twisting of the cell 241 near the middle are twisted close to each other. In this process, the sliding disk 22 is pulled upward only in the longitudinal direction. Under the tension provided by the elastic members 23, the pulling ropes 242 can be kept taut, and the taut twisting of the pulling ropes 242 is used to achieve an auxiliary cutting effect on the soil. When the pulling ropes 242 complete the extrusion and cutting of the soil, Figure 6 and Figure 8 As shown, at this time, each unit cell 241 will also form a twisted and retracted state, forming a "shrink valve"-like structure, thereby utilizing the elastic, tight and tightly connected surfaces of each unit cell 241 to achieve a sealing effect on the lower opening of the drill pipe 1. After the drill pipe 1 is lifted onto the soil layer, the torsion disk 21 can be rotated in the reverse direction to open the opening and remove the complete soil structure layer. Each elastic member 23 will provide a downward pulling force for the sliding disk 22, and also rely on the elasticity of the unit cell 241 to eventually restore each unit cell 241 and the pulling rope 242 to their original state.

[0025] Further, refer to Figure 3 The interior of each unit cell 241 is a sealed cavity.

[0026] In the above embodiments, it is possible to achieve that gas still exists inside after deformation, thereby avoiding the occurrence of shrinkage.

[0027] Further, refer to Figure 1 The length of the unit cell 241 is greater than or equal to the inner ring diameter of the torsion disc 21, and the length of the pulling rope 242 is less than or equal to the length of the unit cell 241 in the unextended state.

[0028] In the above embodiments, the dimensional conditions for completely blocking and covering the drill pipe 1 can be achieved.

[0029] Further, refer to Figure 1 、 Figure 2 and Figure 5 The inner wall of the drill pipe 1 located in the annular groove 11 is provided with a plurality of slide grooves 12 in the longitudinal direction, and the sliding plate 22 is fixedly connected to a plurality of sliders 3 that slide along the slide grooves 12 at positions corresponding to the slide grooves 12 .

[0030] In the above embodiment, the length extension direction of the slide groove 12 is parallel to the center line of the drill pipe 1, and it has multiple functions to improve the stability and position limiting performance of the sliding block 3 when sliding.

[0031] Further, refer to Figure 3 、 Figure 4 and Figure 5 The lower surface of the torsion plate 21 and the upper surface of the sliding plate 22 are provided with step grooves 211 at the positions corresponding to each unit cell 241. The upper and lower ends of the unit cell 241 are connected with fixing parts. The fixing parts are connected to the step grooves 211 to fix the unit cell 241, and the pulling rope 242 is detachably connected to the fixing parts.

[0032] Further, refer to Figure 4 The fixing part includes a step pin 4, the outer diameter of the step pin 4 close to the unit cell 241 is smaller than the inner diameter of the unit cell 241, and the end of the step pin 4 is provided with an annular concave cavity 41. The end of the unit cell 241 is sleeved on the step pin 4 and rolled inward into the concave cavity 41. The unit cell 241 is fixed to the step pin 4 by a plurality of circumferentially distributed pins.

[0033] In the above embodiments, the unit cell 241 can be stably fixed. Specifically, considering that the unit cell 241 is elastic, a hard gasket with holes can be used to connect the portion close to the pin to prevent the gas in the sealed cavity from leaking randomly after deformation.

[0034] Further, refer to Figure 4 and Figure 9 An internal thread groove 42 is provided at the end of the step pin 4, and a nut 5 is threadedly connected to the internal thread groove 42. The nut 5 has a special-shaped hole 51 along the longitudinal direction, and a special-shaped clamping block 52 is fixed on the end of the pulling rope 242. The clamping block 52 can be staggered and engaged with the special-shaped hole 51 after passing through the special-shaped hole 51 and rotating.

[0035] In the above embodiment, the nut 5 can be threadedly connected by the thread it carries through the internal thread groove 42, which can facilitate subsequent disassembly. The staggered connection of the clamping block 52 and the special-shaped hole 51 facilitates the disassembly and maintenance of the pulling rope 242 as a whole. Figure 9 As shown, the center of the special-shaped hole 51 is a circular hole, and rectangular openings extend on both sides of it. The clamping block 52 matches the shape. When the clamping block 52 is aligned in shape and passes through the nut 5 into its interior, after rotation, the corresponding protrusion of the clamping block 52 will achieve a clamping effect. The overall structure is simple and easy to disassemble.

[0036] Further, refer to Figure 1 and Figure 7 The inner wall of the drill pipe 1 is located above the torsion disk 21 and is penetrated by an annular rotating groove 13 to separate the drill pipe 1 into an inner tube and an outer tube. A driving part 6 for controlling the rotation of the torsion disk 21 is provided in the rotating groove 13. The driving part 6 includes: a connecting disk 61, two connecting rods 63, and a rotating cap 64. The connecting disk 61 is rotatably connected to the rotating groove 13. The connecting disk 61 is fixedly connected to the upper surface of the torsion disk 21. The inner tube and the outer tube are located above the connecting disk 61 and are fixedly connected by a block 62. The two connecting rods 63 are both fixedly connected to the upper surface of the connecting disk 61. The upper end of the connecting rod 63 extends out of the drill pipe 1. The rotation angle of the connecting rod 63 is 150° to 180°. A clamping piece for clamping the connecting rod 63 is connected to the block 62. The rotating cap 64 is rotatably connected to the upper end of the drill pipe, and the upper ends of the connecting rods 63 are fixedly connected to the rotating cap 64.

[0037] In the above embodiment, the connecting disk 61 and the connecting rod 63 are provided to connect the torsion disk 21, wherein the connecting rod 63 extends upward and is connected to the rotating cap 64, thereby satisfying the remote control effect. The number of connecting rods 63 is limited to two, thereby improving the stability when controlling the rotating torsion disk 21.

[0038] Further, refer to Figure 7 and Figure 8 The two blocks 62 are relatively distributed on the same radial line in the rotating groove 13. The two blocks 62 are located in the longitudinal direction and have a bayonet 621 for placing the connecting rod 63. When the unit cell 241 is deformed and twisted to block the lower opening of the drill pipe 1, the connecting rod 63 rotates and is clamped into the corresponding bayonet 621. The protruding part of the bayonet 621 is a plastic material or metal material that can be deformed and reset and has a certain strength.

[0039] In the above embodiment, the inner diameter of the bayonet 621 is the same as the outer diameter of the connecting rod 63, and the opening of the bayonet 621 is smaller than the outer diameter of the connecting rod 63. Two arc-shaped over-protruding rounded corners are set at the opening to facilitate the insertion of the connecting rod 63 and prevent it from falling off. By limiting the special positions of the two blocks 62, the maximum rotation angle of the two connecting rods 63 can be controlled, avoiding the difficulty of each unit cell 241 in completely sealing the opening of the drill pipe 1 due to the limited rotation of the connecting rod 63.

[0040] Further, refer to Figure 1 The pulling rope 242 is made of metal or cotton material.

[0041] In the above embodiments, the material of the unit cell 241 is preferably acid- and alkali-resistant rubber such as fluororubber, which can adapt to extreme soil environments. When the pulling rope 242 is made of cotton cloth, the strength of the pulling rope 242 can be enhanced by adding carbon fiber.

[0042] Usage and working principle: The drill bit of the drill pipe 1 contacts the ground surface. During the drilling sampling stage, the drill pipe 1 rotates and presses down under the action of external force, and the soil passes through the drill. When the torsion disk 21 is in the initial position, each cell 241 and the pulling rope 242 are in a vertical natural stretching state, the lower opening of the drill pipe 1 is open, and the opening of the drill pipe 1 enters the sampling tube. Due to the size limit of the opening of the drill pipe 1, the soil sample will not cause excessive squeezing of the cell 241, and the cell 241 has elasticity and can adapt to soil pressure. After the sampling is completed, the torsion disk 21 is rotated by external force, and the rotation of the torsion disk 21 drives the upper part of the cell 241 The lower part is limited by the sliding disk 22 and does not rotate. The middle parts of the cells 241 are close to each other due to the twisting. At this time, the pulling ropes 242 following the twisting of the cell 241 are twisted close to each other near the middle. In this process, the sliding disk 22 is pulled upward only in the longitudinal direction. Under the action of the tension provided by the elastic members 23, the pulling ropes 242 can be kept taut. The taut twisting of the pulling ropes 242 is used to achieve the auxiliary cutting effect on the soil. When the pulling ropes 242 complete the extrusion and cutting of the soil, the cell 241 will also be twisted and retracted, forming a kind of "contraction valve". The structure is shaped like a ball, so that the elastic, tight and tightly connected surfaces of each unit cell 241 are utilized to achieve the effect of sealing the lower opening of the drill pipe 1. After the drill pipe 1 is lifted onto the soil layer, the torsion disk 21 can be rotated in the reverse direction to open the opening and take out the complete soil structure layer. Each elastic member 23 will provide a downward pulling force for the sliding disk 22, and also rely on the elasticity of the unit cell 241 to eventually restore each unit cell 241 and the pulling rope 242 to their original state.

[0043] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A sampling device for shallow geological research in earth science, comprising a drill pipe, characterized in that: An annular groove is formed on the inner wall of the drill pipe near the drill bit. A sealing assembly for sealing the opening is connected to the annular groove. The sealing assembly includes: The torsion plate is an annular structure, which is rotatably connected to the upper portion of the annular groove; The sliding plate is an annular structure, which is longitudinally slidably connected to the lower part of the annular groove, and an annular placement cavity is formed on the upper surface of the annular groove at the bottom of the sliding plate; A plurality of elastic members are placed in the placement cavity, and the upper and lower ends are respectively fixed to the sliding plate and the bottom wall of the placement cavity to increase the resistance of the sliding plate to move upward; The sealing part includes a plurality of longitudinally arranged hollow cylindrical cells and a pulling rope arranged in the middle of the single cell. The single cell is made of rubber. Each of the single cells is evenly and tightly distributed between the torsion disk and the sliding disk. The upper and lower ends of the single cell and the upper and lower ends of the pulling rope are fixedly connected to the torsion disk and the sliding disk respectively. As the torsion disk rotates, the upper part of the single cell is deformed and twisted to seal the lower opening of the drill pipe.

2. A sampling device for shallow geological research in earth science according to claim 1, characterized in that: The interior of each unit cell is a sealed cavity.

3. The sampling device for shallow geological research in earth science according to claim 1, characterized in that: The length of the unit cell is greater than or equal to the inner ring diameter of the torsion disc, and the length of the pulling rope is less than or equal to the length of the unit cell in an unextended state.

4. The sampling device for shallow geological research in earth science according to claim 1, characterized in that: The inner wall of the drill pipe located in the annular groove is provided with a plurality of sliding grooves in the longitudinal direction, and the position of the sliding plate corresponding to each of the sliding grooves is fixedly connected with a plurality of sliding blocks that slide along the sliding grooves.

5. The earth science shallow geological research sampling device according to claim 2, characterized in that: The lower surface of the torsion plate and the upper surface of the sliding plate are provided with step grooves at positions corresponding to the units. The upper and lower ends of the units are connected with fixing parts. The fixing parts fix the units by being connected in the step grooves. The pulling rope is detachably connected to the fixing parts.

6. The earth science shallow geological research sampling device according to claim 5, characterized in that: The fixing part includes a step pin, the outer diameter of the step pin close to the unit cell is smaller than the inner diameter of the unit cell, and the end of the step pin is provided with an annular concave cavity, the end of the unit cell is sleeved on the step pin and rolled inward into the concave cavity, and the unit cell is fixed to the step pin by a plurality of circumferentially distributed pins.

7. The earth science shallow geological research sampling device according to claim 6, characterized in that: An internal thread groove is provided at the end of the step pin, a nut is threadedly connected to the internal thread groove, a special-shaped hole is provided on the nut along the longitudinal direction, and a special-shaped clamping block is fixed on the end of the pulling rope, and the clamping block can be staggered and clamped with the special-shaped hole after passing through the special-shaped hole and rotating.

8. The sampling device for shallow geological research in earth science according to claim 1, characterized in that: An annular rotation groove is formed on the inner wall of the drill pipe above the torsion disc to separate the drill pipe into an inner tube and an outer tube. A driving unit for controlling the rotation of the torsion disc is provided in the rotation groove. The driving unit includes: A connecting plate is rotatably connected to the rotating groove, the connecting plate is fixedly connected to the upper surface of the torsion plate, and the inner tube and the outer tube are located above the connecting plate and are fixedly connected by a block; Two connecting rods are fixedly connected to the upper surface of the connecting plate, the upper ends of the connecting rods extend out of the drill pipe, the connecting rods rotate at an angle of 150° to 180°, and the block is connected with a clamping piece for clamping the connecting rods; The rotating cap rotates on the upper end of the drill pipe, and the upper end of the connecting rod is fixedly connected to the rotating cap.

9. The earth science shallow geological research sampling device according to claim 8, characterized in that: The two blocks are relatively distributed on the same radial line in the rotating groove. The two blocks are located in the longitudinal direction with a bayonet for placing the connecting rod. When the unit cell deforms and twists to seal the lower opening of the drill pipe, the connecting rod rotates and is locked into the corresponding bayonet.

10. The earth science shallow geological research sampling device according to claim 1, characterized in that: The pulling rope is made of metal or cotton material.

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