Thin-wall soil sampler for sampling hard stratum

Abstract

The utility model relates to a thin-wall soil sampler for hard stratum sampling, and relates to the field of geological exploration and soil sampling technologies, the thin-wall soil sampler comprises a power assembly and a splicing assembly, the power assembly comprises a power part and a drill rod, the power part is connected with the drill rod, and the power part can drive the drill rod to be inserted into soil; the splicing assembly comprises two arc plates, a sampling pipe and a cutting ring, the two arc plates are spliced into a cylinder, the sampling pipe is located in the cylinder, one end of the cylinder is connected with the drill rod, the other end of the cylinder is connected with the cutting ring, the cylinder is inserted into soil, part of the soil can enter the sampling pipe, and the sampling pipe is connected with the cutting ring. The outer wall of the sampling tube is attached to the inner wall of the cylinder. The sampling device has the effect that the sampling tube is difficult to take out from the cylinder.

Description

Technical Field

[0001] The present application relates to the field of geological exploration and soil sampling technology, and in particular to a thin-walled soil sampling device for sampling hard strata. Background Art

[0002] In geological exploration and soil science research, the soil sampler is a key tool for obtaining underground soil samples. The soil sampler is used to lift the original soil of the lower test soil as a sample to understand its properties. In engineering geological exploration and investigation work, in order to obtain the physical and mechanical properties of foundation soil, it is sometimes necessary to take original soil samples at deeper depths. This soil sampling equipment is called a soil sampler.

[0003] In the related art, the existing soil sampler includes a drill rod, a cylinder and a ring cutter. One end of the cylinder is fixed to the drill rod, and the other end is fixed to the ring cutter. A semi-closed sampling tube is placed on the cylinder, which uses a cylindrical iron sheet with a gap. When it is necessary to sample the soil, first, select the area where soil sampling is required, and then insert the ring cutter into the selected soil. Use hydraulic impact or heavy hammer to insert the cylinder into the soil until the cylinder is inserted to the appropriate position. At this time, part of the soil can enter the semi-closed sampling tube, and then lift the drill rod, cylinder and ring cutter. The soil in the semi-closed sampling tube can be lifted with the semi-closed sampling tube. When the cylinder and the ring cutter are separated from the soil, the cylinder and the ring cutter are placed on the ground, and the semi-closed sampling tube in the cylinder is taken out, and personnel are allowed to test and analyze the soil.

[0004] Regarding the above-mentioned related technologies, since the outer wall of the semi-closed sampling tube fits with the inner wall of the cylinder, when the soil enters the semi-closed sampling tube, it is easy to expand the semi-closed sampling tube, which not only makes it difficult to remove the sampling tube from the cylinder, but also is likely to destroy the soil structure during the removal process, affecting the integrity of the sample and the accuracy of subsequent analysis. Utility Model Content

[0005] In order to improve the problem that the sampling tube is difficult to remove from the cylinder, the present application provides a thin-walled soil sampler for sampling hard strata.

[0006] The thin-walled soil sampler for sampling hard strata provided in the present application adopts the following technical solution:

[0007] A thin-wall soil sampler for sampling hard strata, comprising a power assembly and a splicing assembly, wherein the power assembly comprises a power member and a drill rod, wherein the power member is connected to the drill rod, and the power member can drive the drill rod to be inserted into the soil;

[0008] The splicing assembly includes two arc plates, a sampling tube and a ring cutter. The two arc plates are spliced ​​into a cylinder. The sampling tube is located in the cylinder. One end of the cylinder is connected to the drill rod, and the other end is connected to the ring cutter. The cylinder is inserted into the soil, and part of the soil can enter the sampling tube. The outer wall of the sampling tube fits with the inner wall of the cylinder.

[0009] By adopting the above technical solution, when it is necessary to sample the soil, first, select the area where soil sampling is required, install the sampling tube and the cylinder, and then connect the cylinder with the sampling tube installed with the drill rod and the ring cutter. Then, move the thin-walled soil sampler for hard stratum sampling to the selected area and adjust its position. Then, start the power part, which can drive the drill rod to move, and the drill rod drives the arc plate and the ring cutter to insert into the selected area. At this time, part of the soil can enter the sampling tube, the soil is compressed and fills the sampling tube, and the outer wall of the sampling tube can fit with the inner wall of the cylinder. After the cylinder moves, When the drill pipe is pushed to the appropriate position, the power part is started again, and the power part lifts the drill rod, thereby lifting the arc plate and the ring knife, moving the arc plate and the ring knife to the appropriate position, separating the cylinder and the drill rod from the ring knife, and then separating the two arc plates. After that, the two ends of the sampling tube are closed and the sampling tube is placed in the designated position. Compared with the related art, the present application continuously advances through the drill rod, and the soil is cut into the sampling tube by the ring knife, and then the arc plate is moved to the appropriate position, and the two arc plates are separated, so that the sampling tube is easy to take out, thereby not damaging the soil sample, which is conducive to improving the problem that the sampling tube is difficult to take out from the cylinder.

[0010] Optionally, the power assembly further comprises a connecting seat, and the connecting seat is fixed to a side of the drill pipe away from the power member;

[0011] Both ends of the arc plate are provided with external threads, and the corresponding external threads on the two arc plates fit together. The connecting seat is provided with an internal thread that matches the external thread on the arc plate on the side away from the drill rod, and the ring cutter is provided with an internal thread that matches the external thread on the arc plate on the side close to the arc plate.

[0012] By adopting the above technical solution, when it is necessary to connect the cylinder and the drill rod, first, the two arc plates are spliced ​​into a cylinder, and then one end of the cylinder is inserted into the connecting seat, and the cylinder is screwed. The external thread of the arc plate cooperates with the internal thread of the connecting seat, so that the cylinder and the connecting seat can be connected, that is, the cylinder and the drill rod are connected. Similarly, the cylinder and the ring cutter are connected; when the sampling is completed, the two arc plates need to be separated, and the cylinder and the connecting seat can be separated from the ring cutter by rotating the cylinder and utilizing the threaded structure at both ends of the cylinder, and then the two arc plates are separated, and the sampling tube is taken out. By setting the threaded structure, the two arc plates can be easily installed and disassembled, which is further beneficial to improve the problem that the sampling tube is difficult to take out from the cylinder.

[0013] Optionally, a plurality of plug blocks are fixed to one side of the arc plate, and the plurality of plug blocks are spaced apart along the length direction of the side of the arc plate. A slot is provided on the other side of the arc plate for inserting a plug block on another arc plate, and the plug block and the slot are interference fit.

[0014] By adopting the above technical solution, when two arc plates need to be spliced, the two arc plates are brought close to each other so that the plug on the arc plate is inserted into the slot on the other arc plate; when the two arc plates need to be separated, only one of the arc plates needs to be pulled to separate the plug from the slot. By setting the plug and the slot to cooperate, the two arc plates can be easily spliced ​​and disassembled.

[0015] Optionally, it also includes multiple connecting components, one connecting component corresponds to one slot, and the connecting component includes a fixing piece, which is sequentially passed through one arc plate and the plug-in block on the other arc plate, and the fixing piece fixes one arc plate and the plug-in block on the other arc plate.

[0016] By adopting the above technical solution, it is necessary to connect two arc plates. First, insert the plug on one arc plate into the slot of the other arc plate. Then, insert the fixing piece through the plug of one arc plate and the plug of the other arc plate in turn. The fixing piece can fix one arc plate and the other arc plate. By setting the fixing piece, it is convenient to fix the two arc plates and enhance the stability of the connection between the two arc plates.

[0017] Optionally, the arc plate is provided with an avoidance groove at the bottom of the slot, and the avoidance groove is communicated with the slot;

[0018] The connecting assembly also includes an abutment member, which is located in the slot. The abutment member includes an abutment plate and a first spring. The abutment plate can move from the slot to one side of the avoidance groove. The abutment plate can contact the plug block. The first spring is located on the side of the abutment plate close to the avoidance groove. The first spring is located in the avoidance groove. The first spring is arranged from the slot to one side of the avoidance groove. One end of the first spring is fixed to the abutment plate, and the other end is fixed to the arc plate.

[0019] By adopting the above technical scheme, when it is necessary to install the two arc plates, the plug on the arc plate is inserted into the slot on the other arc plate, and the plug can contact the abutment plate to push the arc plate, and the plug pushes the abutment plate to move toward the side close to the avoidance groove. At this time, the first spring is compressed, and the first spring has elastic potential energy, and then the two arc plates are fixed by the fixing member; when it is necessary to separate the two arc plates, first, remove the fixing member, and the first spring restores its deformation, which can push the abutment plate to move toward the side away from the avoidance groove, and the abutment plate pushes the plug to move toward the side away from the slot, so that the two arc plates can be separated, and then the two ends of the sampling tube are closed, and the sampling tube can be placed in the specified position. By setting the cooperation of the abutment plate and the first spring, it is convenient to separate the two arc plates, which is further beneficial to improve the problem that the sampling tube is difficult to take out from the cylinder.

[0020] Optionally, it also includes multiple clamping components, one clamping component corresponds to one slot, the clamping component includes two clamping plates and two second springs, the arc plate is fixed with a hinge seat on each of the two slot walls opposite to the slot, one clamping plate is hinged to one hinge seat, the two clamping plates can fix the plug block, one second spring corresponds to one clamping plate, the second spring is located on the side of the clamping plate away from the other clamping plate, the second spring is located on the side of the hinge seat close to the bottom of the slot, the setting direction of the second spring is perpendicular to the axial direction of the slot, one end of the second spring is fixed to the clamping plate, and the other end is fixed to the arc plate.

[0021] By adopting the above technical scheme, when it is necessary to install the two arc plates, the plug on one arc plate is inserted into the slot on the other arc plate, and then the plug is located between the two clamps, and the arc plates are continued to be pushed, and the plug pushes the two clamps to rotate around the hinge seat, and at the same time, the second spring is compressed, and the second spring has elastic potential energy, and the two clamps can clamp the plug, and the two arc plates are fixed; when it is necessary to separate the two arc plates, only one of the arc plates needs to be pulled, and by setting a clamping assembly, on the one hand, the two clamps clamp the plug, so as to enhance the stability of the connection between the two arc plates; on the other hand, only one of the arc plates needs to be pulled to separate the plug from the two clamps until the plug is separated from the slot, and the two arc plates can be separated, which is further conducive to improving the problem that the sampling tube is difficult to remove from the cylinder.

[0022] Optionally, the two clamps are both inclined at a side away from the bottom of the slot, and the two clamps are inclined toward a side away from each other.

[0023] By adopting the above technical solution, by setting the two clamps to be inclined away from each other, the distance between the two clamps away from the bottom of the slot is increased, which makes it easier to insert the plug between the two clamps and fix the plug with the two clamps.

[0024] Optionally, the abutment plate fits into a notch of the avoidance groove.

[0025] By adopting the above technical solution, when two arc plates are installed, the plug of one arc plate is inserted into the slot of the other arc plate, the plug contacts the abutment plate, and the plug continues to be pushed to make the abutment plate move toward one side of the avoidance groove until the abutment plate fits with the notch of the avoidance groove and the plug fits with the bottom of the slot, thereby increasing the stability of the plug inserted into the slot.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Compared with the related art, the present application continuously advances the drill rod, the soil is cut by the ring knife and enters the sampling tube, and then the arc plate is moved to a suitable position to separate the two arc plates, so as to facilitate the removal of the sampling tube, thereby not damaging the soil sample, and is conducive to improving the problem that the sampling tube is difficult to remove from the cylinder;

[0028] 2. By setting a threaded structure, it is easy to install and disassemble the two arc plates, which is further conducive to improving the problem that the sampling tube is difficult to remove from the cylinder;

[0029] 3. By setting up the clamping assembly, on the one hand, the two clamping plates clamp the plug block, which is convenient for enhancing the stability of the connection between the two arc plates; on the other hand, the two arc plates can be separated by pulling only one of the arc plates, which is further conducive to improving the problem that the sampling tube is difficult to remove from the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure in Example 1;

[0031] Figure 2 is a schematic structural diagram of the arc plate in Example 1;

[0032] Figure 3 yes Figure 2 A magnified view of middle;

[0033] Figure 4 yes Figure 2 Enlarged view of middle B;

[0034] Figure 5 yes Figure 2 Enlarged view of middle C;

[0035] Figure 6 is a schematic structural diagram of the arc plate in Example 2;

[0036] Figure 7 yes Figure 6 Enlarged view of middle D;

[0037] Figure 8 yes Figure 6 Enlarged view of E.

[0038] Explanation of the reference numerals: 1. power assembly; 11. power part; 12. drill rod; 13. connecting seat; 2. splicing assembly; 21. arc plate; 211. plug block; 212. slot; 213. avoidance groove; 214. threaded hole; 215. insertion hole; 216. hinged seat; 22. sampling tube; 23. ring knife; 3. connecting assembly; 31. abutment; 311. abutment plate; 312. first spring; 32. fixing member; 4. clamping assembly; 41. clamping plate; 42. second spring. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-8 This application is described in further detail.

[0040] The embodiment of the present application discloses a thin-walled soil sampler for sampling hard strata.

[0041] Example 1

[0042] Reference Figure 1 , Figure 2 and Figure 3 A thin-wall soil sampler for sampling hard strata includes a power component 1, a splicing component 2 and a plurality of connection components 3. The splicing component 2 is arranged on the power component 1, and the connection component 3 is arranged on the splicing component 2.

[0043] Reference Figure 1 The power assembly 1 includes a power piece 11, a drill rod 12 and a connecting seat 13. The power piece 11 is connected to the drill rod 12. In this embodiment, the power piece 11 adopts hydraulic impact or heavy hammer impact. The drill rod 12 is vertically arranged. The drill rod 12 is welded to the connecting seat 13 away from the power piece 11. The power piece 11 can drive the drill rod 12 to be inserted into the soil.

[0044] Reference Figure 1 and Figure 2The splicing assembly 2 is located on the side of the connecting seat 13 away from the drill rod 12. The splicing assembly 2 includes two arc plates 21, a sampling tube 22 and a ring knife 23. Both ends of the arc plate 21 are provided with external threads. The two arc plates 21 can be spliced ​​into a cylinder. After the two arc plates 21 are spliced, the external threads on the arc plates 21 can fit each other. The side of the connecting seat 13 away from the drill rod 12 is provided with an internal thread that matches the external thread on the arc plate 21. The sampling tube 22 is located in the cylinder. The ring knife 23 is located on the side of the arc plate 21 away from the drill rod 12. The side of the ring knife 23 away from the arc plate 21 is blade-shaped, close to An internal thread matching the external thread on the arc plate 21 is provided on one side of the arc plate 21. When the cylinder is connected to the connecting seat 13 and the ring knife 23, the connecting seat 13 and the ring knife 23 can fix the cylinder. When it is necessary to sample the soil, the power piece 11 is turned on, and the power piece 11 drives the drill rod 12 to be inserted into the soil. During this process, the ring knife 23 and the cylinder extend into the soil, and then part of the soil enters the sampling tube 22. Then, the sampling tube 22 can fit with the inner wall of the cylinder. When the cylinder is extended to a suitable position, the cylinder and the ring knife 23 are separated from the soil, and then the cylinder is separated from the drill rod 12 and the ring knife 23.

[0045] Reference Figure 2 , Figure 3 and Figure 4 , multiple connecting components 3 are all arranged on the arc plate 21, and multiple plug blocks 211 are arranged on one side of the arc plate 21. The multiple plug blocks 211 are spaced apart along the length direction of the side of the arc plate 21. The plug blocks 211 are welded to the arc plate 21, and a slot 212 for inserting the plug block 211 on another arc plate 21 is opened on the other side of the arc plate 21, and the plug blocks 211 correspond to the slots 212 one by one, and the plug blocks 211 and the slots 212 are interference fit. One connecting component 3 corresponds to one slot 212, and the connecting component 3 includes an abutment 31 and a fixing member 32. The abutment 31 is located in the slot 212. The arc plate 21 is provided with an avoidance groove 213 at the bottom of the slot 212, and the avoidance groove 213 is communicated with the slot 212. In this embodiment, the abutment 31 includes an abutment plate 311 and a first spring 31 The first spring 312 is located on the side of the abutting plate 311 close to the avoidance groove 213, and the first spring 312 is located in the avoidance groove 213. The first spring 312 is arranged from the slot 212 to the side of the avoidance groove 213. One end of the first spring 312 is welded to the abutting plate 311, and the other end is welded to the arc plate 21. When the insert block 211 is inserted into the slot 212, the insert block 211 is in contact with the abutting plate 311, and the arc plate 21 is continuously pushed. The insert block 211 pushes the abutting plate 311 to move toward the side close to the avoidance groove 213. At this time, the first spring 312 is compressed, and the first spring 312 has elastic potential energy.

[0046] Reference Figure 2 , Figure 4 and Figure 5 A fixing part 32 corresponds to an insert block 211, the fixing part 32 is a countersunk screw, the arc plate 21 has a threaded hole 214 at each slot 212, and the arc plate 21 has an insertion hole 215 at each insert block 211. When the insert block 211 is inserted into the slot 212, the threaded hole 214 corresponds to the insertion hole 215, the countersunk screw passes through the threaded hole 214 and the insertion hole 215 in turn, and the countersunk screw is threadedly connected to the arc plate 21. The countersunk screw can fix one arc plate 21 and the insert block 211 on another arc plate 21.

[0047] The implementation principle of Example 1 is: when it is necessary to sample the soil, first, select the area where soil sampling is required, then connect the splicing component 2 and the power component 1, move the thin-walled soil sampler for hard stratum sampling to the selected area, adjust the position, and then start the power component 1. The power component 1 drives the splicing component 2 to be inserted into the soil. During this process, part of the soil can enter the sampling tube 22 in the splicing component 2. Wait for the arc plate 21 in the splicing component 2 to move to the appropriate position, and then separate the splicing component 2 from the soil through the power component 1, and then take the sampling tube 22 out of the cylinder.

[0048] When it is necessary to sample the soil, the power piece 11 is started, and the power piece 11 drives the drill rod 12 to move, and the drill rod 12 drives the arc plate 21 and the ring knife 23 to be inserted into the selected area. At this time, part of the soil can enter the sampling tube 22, and the sampling tube 22 fits against the inner wall of the cylinder. When the cylinder moves to a suitable position, the power piece 11 is started again, and the power piece 11 lifts the drill rod 12 to lift the arc plate 21 and the ring knife 23. At this time, the sampled soil is located in the sampling tube 22, and the countersunk screw on the arc plate 21 is screwed to separate the countersunk screw from the plug block 211. At this time, the first spring 312 recovers its deformation and can push the abutment plate 311 to move away from the avoidance groove 213. The abutment plate 311 pushes the plug block 211 to move away from the slot 212, so that the two arc plates 21 can be separated, and then the two ends of the sampling tube 22 are closed, and the sampling tube 22 is placed in the specified position.

[0049] Example 2

[0050] Reference Figure 6 , Figure 7 and Figure 8The difference between this embodiment and the embodiment 1 is that a thin-walled soil sampler for sampling hard strata further comprises a plurality of clamping assemblies 4, one clamping assembly 4 is located in a slot 212, the clamping assembly 4 comprises two clamping plates 41 and two second springs 42, the arc plate 21 is provided with a hinge seat 216 on each of the two groove walls directly opposite to the slot 212, one clamping plate 41 corresponds to one hinge seat 216, the two clamping plates 41 can fix the plug block 211, the two clamping plates 41 are inclined away from the bottom of the slot 212, and the two clamping plates 41 are inclined towards the side away from each other, one second spring 42 corresponds to one clamping plate 41, and the second spring 42 is located on the side of the clamping plate 41 away from the other clamping plate 41, The second spring 42 is located on the side of the hinge seat 216 close to the bottom of the slot 212. The setting direction of the second spring 42 is perpendicular to the axial direction of the slot 212. One end of the second spring 42 is welded to the clamp plate 41, and the other end is welded to the arc plate 21. When the two arc plates 21 need to be spliced, the plug block 211 on one arc plate 21 is inserted into the slot 212 on the other arc plate 21. At this time, the plug block 211 is located between the two clamp plates 41, and the arc plate 21 continues to be pushed. The plug block 211 pushes the two clamp plates 41 to rotate around the hinge seat 216. At the same time, the second spring 42 is compressed, and the second spring 42 has elastic potential energy. The two clamp plates 41 can clamp the plug block 211, and the two arc plates 21 are fixed.

[0051] The implementation principle of Example 2 is: when it is necessary to sample the soil, start the power part 11, the power part 11 drives the drill rod 12 to move, and the drill rod 12 drives the arc plate 21 and the ring knife 23 to insert into the selected area. At this time, part of the soil can enter the sampling tube 22, and the sampling tube 22 fits against the inner wall of the cylinder. When the cylinder moves to a suitable position, start the power part 11 again, and the power part 11 lifts the drill rod 12, so that the arc plate 21 and the ring knife 23 are lifted. At this time, the sampled soil is located in the sampling tube 22. The personnel pull the two arc plates 21 in opposite directions to separate the two arc plates 21, and then close the two ends of the sampling tube 22 and place the sampling tube 22 at the designated position.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A thin-walled soil sampler for sampling hard strata, characterized in that: The invention comprises a power assembly (1) and a splicing assembly (2), wherein the power assembly (1) comprises a power piece (11) and a drill rod (12), wherein the power piece (11) is connected to the drill rod (12), and the power piece (11) can drive the drill rod (12) to be inserted into the soil; The splicing assembly (2) comprises two arc plates (21), a sampling tube (22) and a ring knife (23); the two arc plates (21) are spliced ​​into a cylinder; the sampling tube (22) is located inside the cylinder; one end of the cylinder is connected to the drill rod (12) and the other end is connected to the ring knife (23); the cylinder is inserted into the soil, part of the soil can enter the sampling tube (22), and the outer wall of the sampling tube (22) is in contact with the inner wall of the cylinder.

2. A thin-walled soil sampling device for hard stratum sampling according to claim 1, characterized in that: The power assembly (1) further comprises a connecting seat (13), wherein the connecting seat (13) is fixed to a side of the drill rod (12) away from the power member (11); Both ends of the circular arc plate (21) are provided with external threads, and the corresponding external threads on the two circular arc plates (21) fit together. The side of the connecting seat (13) away from the drill rod (12) is provided with internal threads that match the external threads on the circular arc plate (21), and the side of the ring cutter (23) close to the circular arc plate (21) is provided with internal threads that match the external threads on the circular arc plate (21).

3. The thin-walled soil sampling device for hard stratum sampling according to claim 1, characterized in that: A plurality of insert blocks (211) are fixed on one side of the arc plate (21), and the plurality of insert blocks (211) are spaced apart along the length direction of the side of the arc plate (21). A slot (212) is provided on the other side of the arc plate (21) for inserting an insert block (211) on another arc plate (21), and the insert block (211) and the slot (212) are interference fit.

4. A thin-walled soil sampling device for hard stratum sampling according to claim 3, characterized in that: It also includes a plurality of connection components (3), one of the connection components (3) corresponds to one of the slots (212), and the connection component (3) includes a fixing member (32), the fixing member (32) is sequentially inserted into one of the circular arc plates (21) and the plug-in block (211) on the other circular arc plate (21), and the fixing member (32) fixes the one of the circular arc plates (21) and the plug-in block (211) on the other circular arc plate (21).

5. The thin-walled soil sampling device for hard stratum sampling according to claim 4, characterized in that: The arc plate (21) is provided with an avoidance groove (213) at the bottom of the slot (212), and the avoidance groove (213) is communicated with the slot (212); The connecting assembly (3) further comprises an abutment member (31), wherein the abutment member (31) is located in the slot (212), and the abutment member (31) comprises an abutment plate (311) and a first spring (312), wherein the abutment plate (311) can move from the slot (212) to one side of the avoidance groove (213), and the abutment plate (311) can contact the plug block (211), and the first spring (312) is located on a side of the abutment plate (311) close to the avoidance groove (213), and the first spring (312) is located in the avoidance groove (213), and the first spring (312) is arranged from the slot (212) to one side of the avoidance groove (213), and one end of the first spring (312) is fixed to the abutment plate (311), and the other end is fixed to the arc plate (21).

6. The thin-walled soil sampling device for hard stratum sampling according to claim 3 is characterized in that: The invention also comprises a plurality of clamping assemblies (4), wherein one clamping assembly (4) corresponds to one slot (212), the clamping assembly (4) comprises two clamping plates (41) and two second springs (42), the arc plate (21) is fixed with a hinge seat (216) on each of the two slot walls directly facing the slot (212), one clamping plate (41) is hinged with one hinge seat (216), the two clamping plates (41) can fix the plug block (211), and one second spring (42) is fixed with the second spring (42). Two springs (42) correspond to one of the clamps (41), and the second spring (42) is located on the side of the clamp (41) away from the other clamp (41). The second spring (42) is located on the side of the hinge seat (216) close to the bottom of the slot (212). The setting direction of the second spring (42) is perpendicular to the axial direction of the slot (212). One end of the second spring (42) is fixed to the clamp (41), and the other end is fixed to the arc plate (21).

7. A thin-walled soil sampling device for hard stratum sampling according to claim 6, characterized in that: The two clamping plates (41) are both arranged to be inclined on the side away from the bottom of the slot (212), and the two clamping plates (41) are inclined towards the side away from each other.

8. The thin-walled soil sampling device for hard stratum sampling according to claim 5, characterized in that: The abutment plate (311) fits into a notch of the avoidance groove (213).

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