In-situ soil stratified sampling device and sampling method

Abstract

The invention provides an in-situ soil stratified sampling device and a sampling method, and relates to the technical field of soil detection and sampling. The sampling device comprises a mounting base and a driving motor in transmission connection with the mounting base, an outer cylinder is detachably arranged on the mounting base, a spiral blade is arranged on the outer side wall of the outer cylinder, an inner cylinder detachable from the outer cylinder is arranged in the outer cylinder, an input port of the inner cylinder is communicated with an input port of the outer cylinder, and a mounting cavity is formed between the inner cylinder and the outer cylinder; a mounting cavity is formed in the outer cylinder, a plurality of mounting grooves communicating with the mounting cavity are formed in the side wall of the inner cylinder in a surrounding mode, clamping plates are arranged in the mounting grooves, and a position adjusting mechanism for driving the clamping plates to turn over is arranged in the mounting cavity. The outer cylinder enters a soil layer under the assistance of the spiral blade, and soil is cut into a relatively complete cylindrical body by an annular notch formed by the outer cylinder and the inner cylinder, so that a relatively long core body can be conveniently taken from the soil layer, and the cylinder structure can smoothly enter and exit from the soil layer.

Description

Technical Field

[0001] The present invention relates to the technical field of soil detection and sampling, and in particular to an in-situ soil stratification sampling device and a sampling method. Background Art

[0002] Soil is one of the material bases for human survival, and the state of the soil environment is directly related to ecological security and the safety of agricultural products. The implementation of in-situ soil collection tests can provide a good understanding of the vertical migration patterns of organic matter and pollutant elements in the soil under irrigation and rainfall infiltration; it can better understand the soil conditions, and thus provide targeted professional guidance for farmland irrigation and drainage, pollution control or land condition improvement.

[0003] In the prior art, a tool often used in environmental monitoring is a soil sampler, through which soil samples are taken out, and then the soil samples are analyzed to obtain various components contained in the soil; however, in the existing soil sampling device, a sampling cylinder is usually inserted into the soil through mechanical equipment. Due to the squeezing of the cylinder by the soil around the soil core, it is difficult to remove the cylinder, and the cylindrical core body entering the cylinder is also difficult to remove from the inside of the cylinder. Forcible removal can easily cause the integrity of the cylindrical core body to be destroyed, affecting the sampling results. Summary of the invention

[0004] The object of the present invention is to provide an in-situ soil stratification sampling device and a sampling method, which can solve the problems raised by the above-mentioned background technology in view of the deficiencies of the prior art.

[0005] The technical solution of the present invention is achieved in this way:

[0006] The invention provides an in-situ soil stratified sampling device, comprising a mounting seat and a driving motor drivingly connected to the mounting seat, wherein an outer cylinder is detachably provided on the mounting seat, a spiral blade is provided on the outer side wall of the outer cylinder, an inner cylinder detachable therefrom is provided inside the outer cylinder, an input port of the inner cylinder is communicated with an input port of the outer cylinder, an installation chamber is provided between the inner cylinder and the outer cylinder, a plurality of installation grooves respectively communicated with the installation chambers are arranged on the side wall of the inner cylinder, clamps are provided in the installation grooves, and a positioning mechanism for driving the clamps to flip is provided in the installation chamber.

[0007] In some technical schemes of the present invention, the positioning mechanism includes a lifting seat slidably arranged at the input port of the inner cylinder, a plurality of mounting frames corresponding to the clamping plates are arranged around the mounting chamber, the clamping plates are rotatably arranged on the mounting frames, two limit springs respectively connected with the clamping plates are arranged on the mounting frames, a guide cylinder is arranged in the inner cylinder, a guide rod connected with the lifting seat is arranged in the guide cylinder, and a limit seat for changing the flipping angle of multiple clamping plates is arranged on the lifting seat.

[0008] In some technical solutions of the present invention, the limiting seat is in a frustum shape, the large diameter end of the limiting seat is connected to the lifting seat, and the small diameter end of the limiting seat is in contact with the end of the clamping plate.

[0009] In some technical solutions of the present invention, a lifting mechanism for lifting a plurality of clamping plates to move synchronously is provided in the inner cylinder.

[0010] In some technical schemes of the present invention, the lifting mechanism includes a guide frame arranged in the inner cylinder, the mounting seat is fixedly connected to the inner cylinder, the guide cylinder is slidably arranged in the guide frame, a plurality of through grooves are arranged around the outer wall of the guide frame, racks connected to the guide cylinder are slidably arranged in the through grooves, a plurality of gears corresponding to the splints are rotatably arranged in the inner cylinder, the gears are meshed with the corresponding racks, a capstan is arranged on the gears, a traction member is wound around the capstan, and a hanger connected to the mounting frame is arranged at the end of the traction member.

[0011] In some technical solutions of the present invention, a covering mechanism for covering the cylindrical core is provided in the inner cylinder.

[0012] In some technical schemes of the present invention, the coating mechanism includes a loading cylinder and a fixed seat installed in the inner cylinder, a telescopic frame is installed on the loading cylinder, the telescopic frame is provided with a telescopic rod, the telescopic rod is inserted into the fixed seat, the telescopic rod is provided with an adjusting spring connected to the fixed seat, a rolled coating layer is rotatably provided in the loading cylinder, an inlet and outlet tangent to the circle where the loading cylinder is located is provided on the outer wall of the loading cylinder, a driving roller for driving the coating layer to move is provided in the inlet and outlet, an input port connected to the inlet and outlet is provided on the outer side wall of the clamp, a telescopic adjusting member for adjusting the relative distance between the mounting frame and the clamp is provided between the mounting frame and the clamp, and a thermal cutting tool for cutting the coating layer is provided in the input port.

[0013] In some technical solutions of the present invention, the hanger is provided with an annular guide mechanism for guiding the coating layer to surround the cylindrical core, an annular guide groove is provided on the end face of the annular guide mechanism, and a channel connected to the guide groove and the input port is provided on the outer wall of the annular guide mechanism.

[0014] Some technical solutions of the present invention further include a mobile frame, a guide frame is provided on the mobile frame, a lifting platform is slidably provided on the guide frame, the main body of the driving motor is connected to the lifting platform, and an inlet and outlet for the outer cylinder to enter and exit are opened on the bottom plate of the mobile frame.

[0015] Compared with the prior art, the present invention has at least the following advantages or beneficial effects:

[0016] When the outer cylinder and the inner cylinder enter the ground together to coring the soil layer, after the driving motor applies a rotating force to the outer cylinder, the outer cylinder gradually enters the soil layer with the assistance of the spiral blades, and the soil is cut into a relatively complete columnar body by the annular incision formed by the outer cylinder and the inner cylinder, so that the operator can take a longer core body from the soil layer; it is also convenient for the cylinder structure to smoothly enter and exit the soil layer;

[0017] The core body can be sealed by covering the core body with a coating layer to avoid the problem of the core body breaking during the coring process;

[0018] The mounting base is designed as a separate structure from the outer tube, which makes it easy to remove the inner tube from the outer tube and realize coring of the soil layers in layers; after the first coring is completed, the operation can be repeated again, and multiple coring operations can be performed, thereby improving the convenience of coring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the installation structure of the internal structure of the present invention;

[0022] Figure 3 It is a half-section assembly schematic diagram of the present invention;

[0023] Figure 4 It is a three-dimensional schematic diagram of the internal structure of the present invention;

[0024] Figure 5 It is a partial cross-sectional structural schematic diagram of the inner shell and the outer shell in the present invention;

[0025] Figure 6 It is a schematic diagram of a top view and cross-sectional structure of the present invention;

[0026] Figure 7 It is a partial enlarged schematic diagram of the installation structure of the loading cylinder in the present invention;

[0027] Figure 8 It is a partial enlarged structural schematic diagram of the assembly of the limit seat and the clamping plate in the present invention;

[0028] Fig. 9 It is a partial enlarged structural schematic diagram of the assembly of the clamping plate and the mounting frame in the present invention.

[0029] Icons: 1. Mobile frame; 2. Lifting platform; 3. Driving motor; 4. Mounting seat; 5. Outer cylinder; 6. Spiral blade; 7. Lifting seat; 8. Limiting seat; 9. Mounting frame; 10. Clamp; 11. Inner cylinder; 12. Loading cylinder; 13. Limiting spring; 14. Traction piece; 15. Hanger; 16. Annular guide mechanism; 17. Gear; 18. Winch; 19. Guide frame; 20. Rack; 21. Guide cylinder; 22. Guide rod; 23. Block; 24. Mounting chamber; 25. Mounting slot; 26. Telescopic adjustment piece; 27. Telescopic frame; 28. Fixed seat; 29. ​​Coating; 30. Adjustment spring; 31. Telescopic rod; 32. Thermal cutting tool; 33. Guide frame. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example

[0033] Please refer to Figure 1-Figure 9 shown.

[0034] The present invention provides an in-situ soil stratification sampling device, such as Figure 1 , Figure 2As shown, it includes a plate-shaped mounting seat 4 and a driving motor 3 connected to the mounting seat 4 in a transmission manner. The output shaft of the driving motor 3 is provided with an external thread and is fixed in the inner hole at the top of the mounting seat 4 by a nut; the mounting seat 4 is connected to the outer cylinder 5 through a clamping block 23, and the clamping block 23 is buckled in the mounting opening provided on the top wall of the outer cylinder 5. The clamping block 23 is rectangular as a whole and is integrally formed with the mounting seat 4 after being welded. A screw is provided on the top of the mounting seat 4, and the screw passes through the mounting seat 4 and is connected to the internal threaded hole on the clamping block 23; the outer cylinder The outer wall of the outer cylinder 5 is integrally formed with a spiral blade 6 by welding, and the input port of the outer cylinder 5 is provided with a truncated annular cutter, which is integrally formed with the input port of the outer cylinder 5, so that the outer cylinder 5 can enter the ground surface easily; the outer cylinder 5 is provided with a detachable inner cylinder 11, and the input port of the inner cylinder 11 is connected with the input port of the outer cylinder 5 and is magnetically connected through a magnetic pole, and the outer diameter of the inner cylinder 11 matches the inner diameter of the annular cutter, so as to avoid a gap between the two, which causes soil to enter the installation chamber 24; when the outer cylinder 5 is When the outer cylinder 5 and the inner cylinder 11 enter the surface together to coring the soil layer, after the driving motor applies a rotating force to the outer cylinder 5, the outer cylinder 5 gradually enters the soil layer with the assistance of the spiral blades 6, and the soil is cut into a relatively complete columnar body by the annular incision formed by the outer cylinder 5 and the inner cylinder 11, which is not absolutely complete, so that the operator can take a longer core body from the soil layer; since an installation chamber 24 is provided between the inner cylinder 11 and the outer cylinder 5, a plurality of installation holes 24 are provided around the side wall of the inner cylinder 11, which are respectively connected to the installation chamber 24. The mounting groove 25 is provided with a clamping plate 10, and the mounting chamber 24 is provided with a positioning mechanism for driving the clamping plate 10 to flip. In the process of gradually entering the columnar core body in the inner tube 11, it does not directly contact with the inner wall of the inner tube 11, but is in a tubular structure formed by a plurality of clamping plates 10 surrounding each other, and each clamping plate 10 can be compressed along the radial direction of the inner tube 11, thereby avoiding hard contact between the clamping plate 10 and the columnar core body, causing the problem of difficulty in coring the core body during the later coring.

[0035] Preferably, the inner diameter of the circle where the inner cylinder 11 is arranged is larger than the outer diameter of the circular tubular structure formed by splicing a plurality of clamping plates 10. The outer diameter of the columnar core is smaller than the inner diameter of the middle and upper section of the inner cylinder 11.

[0036] The inner cylinder 11 as a whole is composed of two cylindrical structures, one of which has a larger inner diameter and the other has a smaller inner diameter.

[0037] Preferably, a hand-held armrest may be provided on the housing of the driving motor 3 to facilitate the operator to hold the structure with both hands to perform sampling operations.

[0038] In some technical solutions of the present invention, the positioning mechanism includes a lifting seat 7 slidably arranged at the input port of the inner cylinder 11, the lifting seat 7 is in a truncated cone shape, and its outer diameter is equal to the inner diameter of the cylinder with the smaller inner diameter in the inner cylinder 11, and a plurality of mounting frames 9 corresponding to the clamping plate 10 are arranged around the mounting chamber 24, and the clamping plate 10 is rotatably arranged on the upper section of the mounting frame 9 through the bracket, and the mounting frame 9 is provided with two limit springs 13 respectively connected to the clamping plate 10, and the limit springs 13 are located on both sides of the bracket, and the inner cylinder 11 is provided with a guide cylinder 21, and the guide cylinder 21 is provided with a There is a guide rod 22 connected to the lifting seat 7; the above structure is used to guide the lifting seat 7 to move in the vertical direction, and the soil pushes into the inner tube 11 and also applies a lifting force to the lifting seat 7; and the set lifting seat 7 can also play the role of closing the inner tube 11 when the coring operation is not performed; a limit seat 8 is provided on the lifting seat 7 for changing the inclination angle of multiple clamps 10, and the limit seat 8 is in a frustum shape, and the large diameter end of the limit seat 8 is connected to the lifting seat 7, and the small diameter end of the limit seat 8 is in contact with the end of the clamp 10, and the set limit seat 8 gradually moves with the lifting seat 7 When entering the inner cylinder 11, the limit seat 8 will use its conical surface to apply an outward expansion thrust to the clamping plate 10, thereby forcing the outer diameter of the circular tubular structure formed by the splicing of multiple clamping plates 10 to gradually expand, thereby forming a space for accommodating the columnar core. When the columnar core pushes the lifting seat 7 and the limit seat 8 to pass the rotation point of the clamping plate 10 on the mounting frame 9, the columnar core pushes the lifting seat 7 and the limit seat 8 to continue to move in the vertical direction, and the upper end of the clamping plate 10 will move close to the inner wall of the outer cylinder 5, and the lower end of the clamping plate 10 will gradually move with the column. The outer wall of the columnar core body is contacted with the clamping plate 10, thereby clamping the columnar core body, and the limit spring 13 located between the mounting frame 9 and the clamping plate 10 can avoid hard contact when the clamping plate 10 contacts the columnar core body; it is beneficial for the columnar core body to smoothly enter the circular tubular structure formed by the splicing of multiple clamping plates 10; when the lifting seat 7 and the limit seat 8 move to the extreme position in the inner tube 11, the deflection angle of the lower end of the clamping plate 10 reaches the maximum. At this time, the clamping plate cuts out a certain length of the columnar core body, thereby realizing layered coring of the soil layer, and then carrying out the coring work.

[0039] Preferably, the number of the splints 10 provided may be 2, 3 or 4.

[0040] In some technical solutions of the present invention, a lifting mechanism for lifting a plurality of clamping plates 10 to move synchronously is provided in the inner cylinder 11 .

[0041] The mounting frame 9 is slidably disposed on the inner wall of the outer cylinder 5 via a slide rail, which is not shown in the figure.

[0042] In some technical schemes of the present invention, the lifting mechanism includes a guide frame 19 arranged in the inner cylinder 11, the guide frame 19 is connected to the inner top wall of the mounting seat 4, the mounting seat 4 is fixedly connected to the inner cylinder 11 by welding, the guide cylinder 21 is slidably arranged in the guide frame 19, and at least two through grooves are opened around the outer wall of the guide frame 19, and racks 20 connected to the guide cylinder 21 are slidably arranged in the through grooves, and at least two gears 17 corresponding to the splint 10 are rotatably arranged in the inner cylinder 11 through a rotating axis, and a part of the gear 17 is embedded in the through groove, and the gear 17 is meshed with its corresponding rack 20, and a capstan 18 is provided on the gear 17, and a traction member 14 is wound around the capstan 18, and the traction member 14 is a belt-shaped structure, and a hanger 15 connected to the mounting frame 9 is provided at the end of the traction member 14. After the columnar core lifts the lifting seat 7 and the limiting seat 8 in the inner cylinder 11 to a certain height in the vertical direction, that is, after the limiting seat 8 in the inner cylinder 11 moves to the extreme position in contact with the hanger 15, at this time, after the guide rod 22 completely enters the guide cylinder 21, then, through the action of the columnar core continuing to move in the inner cylinder 11, it will push the rack 20 set on the guide cylinder 21 to move in the vertical direction, and drive the gear 17 meshing with it to rotate counterclockwise. At this time, the capstan 18 winds the traction member 14 in the capstan 18, thereby pulling the splint 10 and the columnar core placed between the multiple splints 10 to move in the vertical direction in the inner cylinder 11 at a common speed, so that the structure can accommodate a longer columnar core in the inner cylinder 11.

[0043] In some technical solutions of the present invention, a covering mechanism for covering the cylindrical core is provided in the inner cylinder 11 .

[0044] In some technical schemes of the present invention, the coating mechanism includes a loading cylinder 12 in a cylindrical shape and a fixed seat 28 installed in the inner cylinder 11 by bolts, a telescopic frame 27 is installed on the loading cylinder 12, the telescopic frame 27 is provided with a telescopic rod 31, the telescopic rod 31 is inserted into the fixed seat 28, and the telescopic rod 31 is provided with an adjustment spring 30 connected to the fixed seat 28; through the above structure, when the loading cylinder 12 contacts the clamping plate 10 that moves to the extreme position, the two are prevented from being in hard contact, and then when the two are in contact, the inlet and outlet can be matched with the input port on one of the clamping plates 10 to avoid a gap at the connection between the two; a rolled coating layer 29 is provided in the loading cylinder 12 for rotation, and the coating layer 29 is made of a thin film of plastic material and has flexibility, an inlet and outlet tangent to the circle where the loading cylinder 12 is located is opened on the outer wall of the loading cylinder 12, and a driving roller for driving the coating layer 29 to move is provided in the inlet and outlet, and a small motor is built in the driving roller for conveying the free end of the coating layer 29 wound in the loading cylinder 12 out of the loading cylinder 12 The driving roller can apply a clamping force to the coating layer 29 to prevent it from entering and exiting at will. An input port connected to the inlet and outlet is provided on the outer wall of the clamp plate 10; a telescopic adjustment member 26 for adjusting the relative distance between the mounting frame 9 and the clamp plate 10 is provided, and the telescopic adjustment member 26 is a miniature electric telescopic rod and is installed on the bracket. This technology is prior art and will not be described here. Through the above structure, when the columnar core body is coated with the coating layer 29, a gap is reserved between the clamp plate 10 and the columnar core body so that the coating layer 29 can move in a circle around the columnar core body, thereby coating the columnar core body. A thermal cutting tool 32 for cutting the coating layer 29 is provided in the input port to thermally cut the coating layer. The thermal cutting tool 32 is prior art, which adopts laser cutting method, uses a laser beam as a heat source for cutting, and uses the thermal cutting tool 32 to thermally bond the two ends of the cylindrical coating layer, thereby sealing the columnar core body, thereby preventing the columnar core body from breaking during the coring process.

[0045] In some technical solutions of the present invention, an annular guide mechanism 16 for guiding the coating layer 29 to surround the cylindrical core is provided at the upper end of the mounting frame 9. The annular guide mechanism 16 is in a circular ring shape. An annular guide groove is provided on the end surface of the annular guide mechanism 16 for guiding the coating layer in circular motion. A channel communicating with the guide groove and the input port is provided on the outer side wall of the annular guide mechanism 16. The annular guide mechanism 16 is provided at the connection between the mounting frame 9 and the hanger 15.

[0046] In some technical solutions of the present invention, a mobile frame 1 is further included, a guide frame 33 is provided on the mobile frame 1, a lifting platform 2 is slidably provided on the guide frame 33 through a sliding sleeve, a main body of a driving motor 3 is connected to the lifting platform 2, and an inlet and outlet for the outer cylinder 5 to enter and exit are opened on the bottom plate of the mobile frame 1. The above structure can ensure that the outer cylinder 5 remains stable under the drive of the driving motor 3 to prevent it from shaking, and the wheel group on the mobile frame 1 is convenient for operators to transfer the present structure.

[0047] The stratified sampling method includes the following steps:

[0048] The outer cylinder 5 installed on the mobile frame 1 is moved to the sampling point, and then the driving motor 3 is started. After the driving motor applies a rotational force to the outer cylinder 5, the outer cylinder 5 gradually enters the soil layer with the assistance of the spiral blades 6; the soil is cut into a relatively complete columnar core by the annular incision formed by the outer cylinder 5 and the inner cylinder 11; the columnar core enters the inner cylinder.

[0049] The columnar core exerts an outward expansion thrust on the clamping plate 10 through the positioning mechanism, so that the outer diameter of the circular tubular structure formed by the multiple clamping plates 10 spliced ​​together gradually expands to form a space for accommodating the core; when the core pushes the lifting seat 7 and the limiting seat 8 to move to the limit position, the multiple clamping plates 10 clamp the part of the columnar core and cut a certain length of it;

[0050] As the columnar core continues to move in the inner tube 11, the lifting mechanism is driven by the lifting seat 7 to pull the clamping plate 10 and drive the core placed therein to continue to move in the inner tube 11 along the vertical direction;

[0051] When the lifting mechanism drives the clamping plate 10 and the cylindrical core placed therein to move to a certain height in the inner cylinder 11, the input port on the clamping plate 10 is connected with the inlet and outlet port on the loading cylinder 12, and the coating layer 29 moves in a circular motion around the core under the drive of the driving roller to coat the core;

[0052] Then, the mounting base 4 is separated from the outer cylinder 5, and the inner cylinder 11 is taken out from the outer cylinder 5 to realize the layered coring of the soil layer;

[0053] After the first coring is completed, the inner cylinder 11 is installed in the outer cylinder 5 again and the above operation is repeated to perform multiple coring operations.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An in-situ soil stratification sampling device, characterized in that: The invention comprises a mounting seat (4) and a driving motor (3) drivingly connected to the mounting seat (4); the mounting seat (4) is detachably provided with an outer cylinder (5); the outer side wall of the outer cylinder (5) is provided with a spiral blade (6); the outer cylinder (5) is provided with an inner cylinder (11) detachable therefrom; the input port of the inner cylinder (11) is communicated with the input port of the outer cylinder (5); a mounting chamber (24) is provided between the inner cylinder (11) and the outer cylinder (5); a plurality of mounting grooves (25) are arranged around the side wall of the inner cylinder (11) and are respectively communicated with the mounting chamber (24); a clamping plate (10) is arranged in each of the mounting grooves (25); and a positioning mechanism for driving the clamping plate (10) to flip is provided in the mounting chamber (24).

2. An in-situ soil stratification sampling device according to claim 1, characterized in that: The positioning mechanism includes a lifting seat (7) slidably arranged at the input port of the inner cylinder (11); a plurality of mounting frames (9) corresponding to the clamping plates (10) are arranged around the mounting chamber (24); the clamping plates (10) are rotatably arranged on the mounting frames (9); the mounting frames (9) are provided with two limit springs (13) respectively connected to the clamping plates (10); a guide cylinder (21) is arranged in the inner cylinder (11); a guide rod (22) connected to the lifting seat (7) is arranged in the guide cylinder (21); and a limit seat (8) for changing the flipping angle of the plurality of clamping plates (10) is provided on the lifting seat (7).

3. An in-situ soil stratification sampling device according to claim 2, characterized in that: The limiting seat (8) is in the shape of a truncated cone, the large diameter end of the limiting seat (8) is connected to the lifting seat (7), and the small diameter end of the limiting seat (8) is in contact with the end of the clamping plate (10).

4. An in-situ soil stratification sampling device according to claim 2 or 3, characterized in that: A lifting mechanism for lifting a plurality of clamping plates (10) to move synchronously is arranged in the inner cylinder (11).

5. The in-situ soil stratification sampling device according to claim 4, characterized in that: The lifting mechanism comprises a guide frame (19) arranged in the inner cylinder (11), the mounting seat (4) is fixedly connected to the inner cylinder (11), the guide cylinder (21) is slidably arranged in the guide frame (19), a plurality of through grooves are arranged around the outer wall of the guide frame (19), racks (20) connected to the guide cylinder (21) are slidably arranged in the through grooves, a plurality of gears (17) corresponding to the clamping plate (10) are rotatably arranged in the inner cylinder (11), the gears (17) are meshed with the corresponding racks (20), a capstan (18) is arranged on the gears (17), a traction member (14) is wound around the capstan (18), and a hanger (15) connected to the mounting frame (9) is arranged at the end of the traction member (14).

6. An in-situ soil stratification sampling device according to claim 2 or 3, characterized in that: The inner cylinder (11) is provided with a covering mechanism for covering the columnar core.

7. The in-situ soil stratification sampling device according to claim 6, characterized in that: The coating mechanism comprises a loading cylinder (12) and a fixed seat (28) installed in the inner cylinder (11); a telescopic frame (27) is installed on the loading cylinder (12); the telescopic frame (27) is provided with a telescopic rod (31); the telescopic rod (31) is inserted into the fixed seat (28); the telescopic rod (31) is provided with an adjusting spring (30) connected to the fixed seat (28); a rolled coating layer (29) is rotatably provided in the loading cylinder (12); an inlet and outlet tangent to a circle where the loading cylinder (12) is located is provided on the outer wall of the loading cylinder (12); a driving roller for driving the coating layer (29) to move is provided in the inlet and outlet; an input port connected to the inlet and outlet is provided on the outer wall of the clamping plate (10); a telescopic adjusting member (26) for adjusting the relative distance between the mounting frame (9) and the clamping plate (10) is provided between the mounting frame (9) and the clamping plate (10); a thermal cutting tool (32) for cutting the coating layer (29) is provided in the input port.

8. An in-situ soil stratification sampling device according to claim 7, characterized in that: The mounting frame (9) is provided with an annular guide mechanism (16) for guiding the coating layer (29) to surround the columnar core body, an annular guide groove is provided on the end surface of the annular guide mechanism (16), and an outer side wall of the annular guide mechanism (16) is provided with a channel connected to the guide groove and the input port.

9. The in-situ soil stratification sampling device according to claim 1, characterized in that: It also comprises a moving frame (1), the moving frame (1) is provided with a guide frame (33), a lifting platform (2) is slidably provided on the guide frame (33), the body of the driving motor (3) is connected to the lifting platform (2), and an inlet and outlet for the outer cylinder (5) to enter and exit are opened on the bottom plate of the moving frame (1).

10. An in-situ soil stratification sampling method, characterized in that: The sampling device comprising any one of claims 1 to 9, comprising the steps of: The outer cylinder (5) mounted on the mobile frame (1) is moved to the sampling point, and then the driving motor is started. After the driving motor applies a rotational force to the outer cylinder (5), the outer cylinder (5) gradually enters the soil layer with the assistance of the spiral blades (6); at this time, the soil is cut into a columnar core by the annular cut formed by the outer cylinder (5) and the inner cylinder (11), and the columnar core also enters the inner cylinder (11) when the outer cylinder (5) enters the soil layer; The columnar core body applies an outward expansion thrust to the clamping plate (10) through the positioning mechanism, so that the outer diameter of the circular tubular structure formed by splicing a plurality of clamping plates (10) together gradually expands, thereby forming a space for accommodating the core body; when the core body pushes the lifting seat (7) and the limiting seat (8) to move to the limit position, the plurality of clamping plates (10) clamp and cut off a part of the columnar core body; The columnar core body continues to move in the inner cylinder (11), and the lifting mechanism is driven by the lifting seat (7) to pull the clamping plate (10) and drive the columnar core body placed therein to continue to move in the inner cylinder (11) along the vertical direction; When the lifting mechanism drives the clamping plate and the columnar core body placed therein to continue to move in the inner cylinder (11); the input port on the clamping plate (10) is connected to the inlet and outlet port on the loading cylinder (12), and the coating layer (29) moves in a circular motion around the columnar core body under the drive of the driving roller, thereby coating the columnar core body; Then, the mounting seat (4) is separated from the outer cylinder (5), and the inner cylinder (11) is taken out from the outer cylinder (5), so as to realize the layered coring of the soil layer; After the first coring is completed, the inner cylinder (11) is installed again in the outer cylinder (5) and the operation is repeated to perform multiple coring operations.

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