In-situ soil layering sampling device and sampling method

Abstract

The application provides an in-situ soil layering sampling device and a sampling method, and relates to the technical field of soil detection sampling. The sampling device comprises a mounting seat, a driving motor in transmission connection with the mounting seat, a detachable outer cylinder provided on the mounting seat, a spiral blade provided on the outer side wall of the outer cylinder, a detachable inner cylinder provided in the outer cylinder, an input port of the inner cylinder in mutual communication with an input port of the outer cylinder, a mounting chamber provided between the inner cylinder and the outer cylinder, a plurality of mounting grooves provided on the side wall of the inner cylinder and in communication with the mounting chamber, a clamping plate provided in each mounting groove, a position adjusting mechanism provided in the mounting chamber and used for driving the clamping plate to overturn, and the like. When the outer cylinder and the inner cylinder jointly enter the earth surface to take the core of the soil layer, the driving motor applies a rotating force to the outer cylinder, the outer cylinder enters the soil layer under the assistance of the spiral blade, the soil is cut into a relatively complete columnar body by the annular incision formed by the outer cylinder and the inner cylinder, the core body with a relatively long length is conveniently taken from the soil layer, and the cylinder structure is conveniently and smoothly put in and out of the soil layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil detection sampling, in particular to an in-situ soil layered sampling device and a sampling method. BACKGROUND

[0002] Soil is one of the material bases for human survival, and the condition of soil environment is directly related to ecological safety and the safety of agricultural products. The implementation of in-situ soil collection test can well understand the migration rule of organic matter and pollutant elements in soil in the vertical direction under the penetration of irrigation and rainfall; better understand the soil condition, so as to provide professional guidance for farmland irrigation and drainage, pollution control or land condition improvement.

[0003] In the prior art, the tool frequently used in environmental monitoring is a soil sampler, which takes out soil samples through the sampler, and then analyzes the soil samples to obtain various components contained in the soil; however, in the existing soil sampling device, the sampling cylinder is usually inserted into the soil by mechanical equipment, due to the extrusion of the soil around the soil core to the cylinder, it is difficult to take out the cylinder, and the columnar core body entering the cylinder is also difficult to take out from the inside of the cylinder, and forcibly taking out can easily damage the integrity of the columnar core body, affecting the sampling result. SUMMARY

[0004] The purpose of the present application is to provide an in-situ soil layered sampling device and a sampling method, which can solve the problems raised in the background art.

[0005] The technical scheme of the present application is realized as follows:

[0006] The present application provides an in-situ soil layered sampling device, which comprises a mounting seat and a driving motor in transmission connection with the mounting seat, a detachable outer cylinder is arranged on the mounting seat, a spiral blade is arranged on the outer side wall of the outer cylinder, a detachable inner cylinder is arranged in the outer cylinder, the input port of the inner cylinder and the input port of the outer cylinder are in communication with each other, a mounting chamber is arranged between the inner cylinder and the outer cylinder, a plurality of mounting grooves are arranged on the side wall of the inner cylinder in a ring shape and are in communication with the mounting chamber, a clamping plate is arranged in each mounting groove, and a position adjusting mechanism for driving the clamping plate to flip is arranged in the mounting chamber.

[0007] In some technical schemes of the present application, the position adjusting mechanism comprises a lifting seat slidingly arranged at the input port of the inner cylinder, a plurality of mounting frames corresponding to the clamping plates are arranged in the mounting chamber in a ring shape, the clamping plates are rotationally arranged on the mounting frames, two limiting springs 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 limiting seat for changing the flipping angle of the plurality of clamping plates is arranged on the lifting seat.

[0008] In some technical solutions of the present application, the limiting seat is in the shape of a truncated cone, the large-diameter end of the limiting seat is connected with the lifting seat, and the small-diameter end of the limiting seat is in abutment with the end of the clamping plate.

[0009] In some technical solutions of the present application, the inner cylinder is internally provided with a lifting mechanism for lifting the multiple clamping plates to move synchronously.

[0010] In some technical solutions of the present application, the lifting mechanism comprises a guide frame arranged in the inner cylinder, the mounting seat is fixedly connected with the inner cylinder, the guide cylinder is slidingly arranged in the guide frame, a plurality of through grooves are arranged around the outer side wall of the guide frame, a gear rack connected with the guide cylinder is slidingly arranged in each through groove, a plurality of gears corresponding to the clamping plates are rotationally arranged in the inner cylinder, the gears are in meshing engagement with the corresponding gear racks, a winch is arranged on each gear, a traction member is wound around each winch, and an hanger connected with the mounting frame is arranged at the end of the traction member.

[0011] In some technical solutions of the present application, the inner cylinder is internally provided with a wrapping mechanism for wrapping the columnar core.

[0012] In some technical solutions of the present application, the wrapping mechanism comprises a loading cylinder and a fixing seat arranged in the inner cylinder, the loading cylinder is provided with an extension frame, the extension frame is provided with an extension rod, the extension rod is arranged in the fixing seat, an adjusting spring connected with the fixing seat is arranged on the extension rod, a wrapping layer in the shape of a roll is rotationally arranged in the loading cylinder, an inlet and outlet tangential to the circle where the loading cylinder is arranged is arranged on the outer wall of the loading cylinder, a driving roller for driving the wrapping layer to move is arranged in the inlet and outlet, an input port in communication with the inlet and outlet is arranged on the outer side wall of the clamping plate, an extension adjusting member for adjusting the relative distance between the mounting frame and the clamping plate is arranged therebetween, and a hot cutting tool for cutting the wrapping layer is arranged in the input port.

[0013] In some technical solutions of the present application, the hanger is provided with an annular guide mechanism for guiding the wrapping layer to surround the columnar core, an annular guide groove is arranged on the end face of the annular guide mechanism, and a passage in communication with the guide groove and the input port is arranged on the outer side wall of the annular guide mechanism.

[0014] In some technical solutions of the present application, the mobile frame is further provided with a guide frame, a lifting platform is slidingly arranged on the guide frame, the body of the driving motor is connected with the lifting platform, and an inlet and outlet for the outer cylinder to pass in and out is arranged on the bottom plate of the mobile frame.

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

[0016] When the outer cylinder and the inner cylinder jointly enter the earth surface to take the core, the driving motor applies a rotating force to the outer cylinder, and the outer cylinder gradually enters the soil layer with the aid of the helical blade, and the soil is cut by the annular incision formed by the outer cylinder and the inner cylinder to form a relatively complete columnar body, so that the operator can take out a long core from the soil layer; and the cylinder structure can smoothly enter and exit the soil layer;

[0017] The core is sealed by the cladding layer, so that the problem of core breakage during coring is avoided;

[0018] The mounting seat is designed as a separate structure from the outer cylinder, so that the inner cylinder can be taken out of the outer cylinder, and layered coring of the soil layer is realized; after the first coring is completed, the operation is repeated again, and multiple coring operations can be performed, thereby improving the convenience of coring. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

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

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

[0022] Figure 3 It is a schematic diagram of the semi-section combination of the present application;

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

[0024] Figure 5 It is a schematic diagram of the partial section structure of the inner shell and the outer shell in the present application;

[0025] Figure 6 It is a schematic diagram of the top view section structure in the present application;

[0026] Figure 7 It is a schematic diagram of the mounting structure of the loading cylinder in the present application;

[0027] Figure 8 It is a schematic diagram of the partial enlarged structure of the limiting seat and the clamping plate when assembled in the present application;

[0028] Figure 9 It is a schematic diagram of the partial enlarged structure of the clamping plate and the mounting frame when assembled in the present application.

[0029] Icon: 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, clamping plate; 11, inner cylinder; 12, loading cylinder; 13, limiting spring; 14, traction piece; 15, hanging bracket; 16, annular guide mechanism; 17, gear; 18, winch; 19, guide frame; 20, rack; 21, guide cylinder; 22, guide rod; 23, clamping block; 24, mounting chamber; 25, mounting groove; 26, telescopic adjusting piece; 27, telescopic frame; 28, fixing seat; 29, cladding layer; 30, adjusting spring; 31, telescopic rod; 32, hot cutting tool; 33, guide frame. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0032] EMBODIMENT

[0033] Please refer to Figures 1-9 the drawings.

[0034] The present application provides an in-situ soil layer sampling device, such as Figure 1 , Figure 2As shown, including the mounting seat 4 in plate shape and the driving motor 3 in transmission connection with the mounting seat 4, the output shaft of the driving motor 3 is provided with external threads, and is fixed in the inner hole at the top of the mounting seat 4 through a nut; the mounting seat 4 is connected with the outer cylinder 5 through the clamping block 23, 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 in the shape of a rectangle as a whole, which is integrally formed after being welded with the mounting seat 4, and the top of the mounting seat 4 is provided with a screw, which is connected with the internal thread hole on the clamping block 23 after penetrating through the mounting seat 4; the outer side wall of the outer cylinder 5 is integrally formed with the spiral blade 6 through welding, and the input port of the outer cylinder 5 has an annular cutter in the shape of a truncated cone, which is integrally formed with the input port of the outer cylinder 5, facilitating the entry of the outer cylinder 5 into the ground; the inner cylinder 11 is detachably arranged in the outer cylinder 5, the input port of the inner cylinder 11 is in communication with the input port of the outer cylinder 5 and is magnetically connected through magnetic poles, and the outer diameter of the inner cylinder 11 matches the inner diameter of the annular cutter, so as to avoid the generation of gaps between the two, causing the soil to enter the mounting chamber 24; when the outer cylinder 5 and the inner cylinder 11 jointly enter the ground to take the core of the soil layer, the driving motor applies a rotating force to the outer cylinder 5, and the outer cylinder 5 gradually enters the soil layer with the aid of the spiral blade 6, and the soil is cut by the annular incision formed by the outer cylinder 5 and the inner cylinder 11 to form a relatively complete columnar body, which is not absolutely complete, so as to facilitate the operator to take a longer core of the soil layer; since the mounting chamber 24 is arranged between the inner cylinder 11 and the outer cylinder 5, a plurality of mounting grooves 25 are arranged on the side wall of the inner cylinder 11 and are in communication with the mounting chamber 24, and the clamping plate 10 is arranged in each mounting groove 25, and under the aid of the position adjusting mechanism for driving the clamping plate 10 to flip, the columnar core gradually entering the inner cylinder 11 will not directly contact with the inner wall of the inner cylinder 11, but will be in the circular tubular structure formed by the plurality of clamping plates 10 surrounding each other, and each clamping plate 10 can be compressed along the radial direction of the inner cylinder 11, so as to avoid the hard contact between the clamping plate 10 and the columnar core, and to avoid the problem of difficult core taking in the later core taking.

[0035] Preferably, the inner diameter of the circle where the inner cylinder 11 is arranged is greater than the outer diameter of the circular tubular structure formed by the plurality of clamping plates 10 spliced with each other. The outer diameter of the columnar core is smaller than the inner diameter of the upper segment of the inner cylinder 11.

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

[0037] Preferably, a handrail can be further arranged on the shell of the driving motor 3, so as to facilitate the operator to hold the structure with both hands to perform sampling operation.

[0038] In some technical solutions of the present invention, the adjustment mechanism includes a lifting seat 7 slidably disposed at the inlet of the inner cylinder 11. The lifting seat 7 is frustum-shaped, and its outer diameter is equal to the inner diameter of the smaller inner diameter cylinder in the inner cylinder 11. Multiple mounting brackets 9 corresponding to the clamping plate 10 are arranged around the mounting chamber 24. The clamping plate 10 is rotatably disposed on the upper section of the mounting bracket 9 via a bracket. Two limiting springs 13, respectively connected to the clamping plate 10, are provided on the mounting bracket 9. The limiting springs 13 are located on both sides of the bracket. A guide cylinder 21 is provided inside the inner cylinder 11, and the guide cylinder 21 contains... A guide rod 22 is connected to the lifting seat 7; the above structure is used to guide the lifting seat 7 to move in the vertical direction, and also to apply a lifting force to the lifting seat 7 when the soil is pushed into the inner cylinder 11; the lifting seat 7 can also close the inner cylinder 11 when the core sampling operation is not performed; the lifting seat 7 is provided with a limiting seat 8 for changing the tilt angle of multiple clamping plates 10. The limiting seat 8 is frustoconical, 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 abuts against the end of the clamping plate 10. The limiting seat 8 is provided as the lifting seat 7 gradually moves forward. When the core enters the inner cylinder 11, the limiting seat 8 will use its conical surface to apply an outward expanding thrust to the clamping plate 10, thereby forcing the outer diameter of the cylindrical structure formed by the splicing of multiple clamping plates 10 to gradually expand, thus forming a space to accommodate the columnar core. After the columnar core pushes the lifting seat 7 and the limiting seat 8 past the rotation point of the clamping plate 10 on the mounting frame 9, the columnar core will continue to push the lifting seat 7 and the limiting seat 8 to move vertically. The upper end of the clamping plate 10 will move closer to the inner wall of the outer cylinder 5, and the lower end of the clamping plate 10 will move closer to the columnar core. The outer wall of the columnar core contacts the core, thus clamping the columnar core. The limiting spring 13 located between the mounting frame 9 and the clamping plate 10 can prevent hard contact between the clamping plate 10 and the columnar core. This facilitates the smooth entry of the columnar core into the circular tubular structure formed by the splicing of multiple clamping plates 10. When the lifting seat 7 and the limiting seat 8 move to their limit positions in the inner cylinder 11, the lower end of the clamping plate 10 deflects at its maximum angle. At this time, the clamping plate cuts out a certain length of the columnar core, thereby realizing the layered core sampling of the soil layer, and then the core sampling work is carried out.

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

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

[0041] Mounting bracket 9 is slidably mounted on the inner wall of outer cylinder 5 via a slide rail, and is not shown in the figure.

[0042] In some technical schemes of the present application, the lifting mechanism comprises a guide frame 19 arranged in the inner cylinder 11, the guide frame 19 is connected with the inner top wall of the mounting seat 4, the mounting seat 4 is fixedly connected with the inner cylinder 11 by welding, the guide cylinder 21 is slidingly arranged in the guide frame 19, at least two through grooves are formed around the outer side wall of the guide frame 19, a rack 20 connected with the guide cylinder 21 is slidingly arranged in each through groove, at least two gears 17 corresponding to the clamping plates 10 are rotatably arranged in the inner cylinder 11 through a rotating shaft, the gears 17 are partially embedded in the through grooves, the gears 17 are in meshing engagement with the racks 20 corresponding thereto, the gears 17 are each provided with a winch 18, the winch 18 is each wound with a traction member 14, the traction member 14 has a belt structure, and the end of the traction member 14 is provided with a hanging bracket 15 connected with the mounting bracket 9. When the columnar core body lifts the lifting seat 7 and the limiting seat 8 in the inner cylinder 11 to a certain height along the vertical direction, i.e. when the limiting seat 8 in the inner cylinder 11 moves to the limit position in contact with the hanging bracket 15, at this time, the guide rod 22 completely enters the guide cylinder 21, then, by the action of the columnar core body continuously moving in the inner cylinder 11, the columnar core body will push the rack 20 arranged on the guide cylinder 21 to move along the vertical direction and drive the gear 17 in meshing engagement therewith to rotate counterclockwise, at this time, the winch 18 winds the traction member 14 in the winch 18, so as to pull the clamping plate 10 and the columnar core body placed between the clamping plates 10 to move in the inner cylinder 11 along the vertical direction at a common speed, which facilitates the structure to accommodate a longer columnar core body in the inner cylinder 11.

[0043] In some technical schemes of the present application, the inner cylinder 11 is provided with a cladding mechanism for cladding the columnar core body.

[0044] In some technical schemes of the present application, the coating mechanism comprises a loading cylinder 12 in the shape of a cylinder and a fixing seat 28 mounted in the inner cylinder 11 by bolts, the loading cylinder 12 is provided with an extension frame 27, the extension frame 27 is provided with an extension rod 31, the extension rod 31 is arranged in the fixing seat 28, and the extension rod 31 is provided with an adjusting spring 30 connected with the fixing seat 28; through the above structure, when the loading cylinder 12 contacts the clamping plate 10 moving to the limit position, the hard contact between the two is avoided, and then when the two contact, the inlet and outlet can be matched with the input port on one of the clamping plates 10, so as to avoid the gap at the connection between the two; the loading cylinder 12 is rotatably provided with a coating layer 29 in the shape of a roll, the coating layer 29 is a plastic material in the shape of a film and has flexibility, the outer wall of the loading cylinder 12 is provided with an inlet and outlet tangent to the circle where the loading cylinder 12 is located, the inlet and outlet are provided with a driving roller for driving the movement of the coating layer 29, the driving roller is internally provided with a small motor for conveying the free end of the coating layer 29 wound in the loading cylinder 12 out of the loading cylinder 12, and the driving roller can exert a clamping force on the coating layer 29 to avoid its random entry and exit, and the outer side wall of the clamping plate 10 is provided with an input port in communication with the inlet and outlet; the extension adjusting part 26 for adjusting the relative distance between the mounting frame 9 and the clamping plate 10 is arranged between the mounting frame 9 and the clamping plate 10, the extension adjusting part 26 is a micro electric extension rod and is mounted on the bracket, which is a prior art and will not be described here, through the above structure, when the coating layer 29 is used to coat the columnar core, a gap is reserved between the clamping plate 10 and the columnar core to facilitate the circumferential movement of the coating layer 29 around the columnar core, so as to coat the columnar core, the input port is provided with a hot cutting tool 32 for cutting the coating layer 29 to heat cut the coating layer, the hot cutting tool 32 is a prior art, which adopts a laser cutting mode, uses a laser beam as a heat source for cutting, and uses the hot cutting tool 32 to heat and bond the two ends of the coating layer in the shape of a cylinder, so as to seal the columnar core and avoid the problem of breakage of the columnar core during the coring process.

[0045] In some technical schemes of the present application, the upper end of the mounting frame 9 is provided with an annular guide mechanism 16 for guiding the coating layer 29 around the columnar core, the annular guide mechanism 16 is in the shape of a ring, the end face of the annular guide mechanism 16 is provided with an annular guide groove for guiding the circumferential movement of the coating layer, and the outer side wall of the annular guide mechanism 16 is provided with a channel in communication with the guide groove and the input port. The annular guide mechanism 16 is arranged at the connection between the mounting frame 9 and the hanging bracket 15.

[0046] In some technical solutions of the present application, the mobile frame 1 is further provided with a guide frame 33, the lifting platform 2 is slidably arranged on the guide frame 33 through a sliding sleeve, the body of the driving motor 3 is connected with the lifting platform 2, and the bottom plate of the mobile frame 1 is provided with an inlet and outlet for the outer cylinder 5. The above structure can ensure that the outer cylinder 5 is stable under the driving of the driving motor 3, and avoid shaking, and the wheel set on the mobile frame 1 facilitates the operator to move the structure.

[0047] The layered sampling method comprises 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 rotating force to the outer cylinder 5, the outer cylinder 5 gradually enters the soil layer under the assistance of the helical blade 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; and the columnar core enters the inner cylinder.

[0049] The columnar core applies an outward expanding thrust to the clamping plate 10 through the positioning mechanism, so that the outer diameter of the circular tubular structure formed by the plurality of clamping plates 10 gradually expands, forming a space for accommodating the core; when the core drives the lifting seat 7 and the limiting seat 8 to move to the limit position, the plurality of clamping plates 10 clamp the local part of the columnar core and cut a certain length;

[0050] During the continuous movement of the columnar core in the inner cylinder 11, the lifting mechanism is pulled by the lifting seat 7 to drive the clamping plate 10 and the core placed therein to continue to move in the vertical direction in the inner cylinder 11;

[0051] When the lifting mechanism drives the clamping plate 10 and the columnar core placed therein to move to a certain height in the inner cylinder 11, the input port on the clamping plate 10 is in communication with the inlet and outlet on the loading cylinder 12, and the cover layer 29 performs circumferential motion around the core under the driving of the driving roller to cover the core.

[0052] Then, the mounting seat 4 is separated from the outer cylinder 5, and the inner cylinder 11 is taken out of the outer cylinder 5, so as to realize 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 to repeat the above operation for multiple coring operations.

[0054] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An in-situ soil stratification sampling device, characterized by, The utility model provides a kind of spiral mixer, including mounting seat (4) and drive motor (3) with mounting seat (4) transmission connection, the detachable outer cylinder (5) is provided on the mounting seat (4), the outer cylinder (5) outer side wall is equipped with spiral blade (6), outer cylinder (5) is equipped with with its detachable inner cylinder (11), the input of the inner cylinder (11) with the input of the outer cylinder (5) each other intercommunication, the inner cylinder (11) with the outer cylinder (5) between being equipped with installation chamber (24), the side wall of the inner cylinder (11) is equipped with multiple installation groove (25) respectively with the installation chamber (24) intercommunication, the installation groove (25) is equipped with clamping plate (10) in each, the installation chamber (24) is equipped with the positioner mechanism that drives the clamping plate (10) overturning, The positioner mechanism includes lifting seat (7) slidingly disposed at the input of the inner cylinder (11), the installation chamber (24) is equipped with multiple mounting racks (9) corresponding to clamping plate (10) around, the clamping plate (10) is rotatably disposed on mounting rack (9), the mounting rack (9) is equipped with two limit springs (13) respectively connected with the clamping plate (10), the inner cylinder (11) is equipped with guide cylinder (21), the guide cylinder (21) is equipped with guide rod (22) connected with the lifting seat (7), the lifting seat (7) is equipped with limiting seat (8) for changing the overturning angle of multiple clamping plates (10), The inner cylinder (11) is equipped with a covering mechanism for covering a cylindrical core, The covering mechanism includes loading cylinder (12) and fixing seat (28) mounted in the inner cylinder (11), the telescopic frame (27) is mounted on the loading cylinder (12), the telescopic frame (27) is provided with a telescopic rod (31), the telescopic rod (31) penetrates the fixing seat (28), the telescopic rod (31) is provided with an adjusting spring (30) connected with the fixing seat (28), the loading cylinder (12) is rotatably provided with a coiled covering layer (29), an inlet and outlet is formed on the outer wall of the loading cylinder (12) and is tangent to the circle where the loading cylinder (12) is located, a drive roller is arranged in the inlet and outlet to drive the movement of the covering layer (29), an input port is formed on the outer side wall of the clamping plate (10) and is in communication with the inlet and outlet, the telescopic adjusting member (26) is arranged between the mounting rack (9) and the clamping plate (10) to adjust the relative distance between them, and a hot cutting tool (32) is arranged in the input port to cut the covering layer (29).

2. An in situ soil layer sampling device according to claim 1, wherein, The limiting seat (8) is in the form of a truncated cone, the large-diameter end of the limiting seat (8) is connected with the lifting seat (7), and the small-diameter end of the limiting seat (8) abuts against the end of the clamping plate (10).

3. An in situ soil layer sampling device according to claim 1 or 2, characterised in that, The inner cylinder (11) is equipped with a lifting mechanism for lifting the synchronous movement of multiple clamping plates (10).

4. An in situ soil layer sampling device according to claim 3, wherein, The lifting mechanism comprises a guide frame (19) arranged in the inner cylinder (11), the mounting seat (4) is fixedly connected with the inner cylinder (11), the guide cylinder (21) is slidingly arranged in the guide frame (19), a plurality of through grooves are formed in the outer side wall of the guide frame (19), the through grooves are slidingly provided with racks (20) connected with the guide cylinder (21), a plurality of gears (17) corresponding to the clamping plates (10) are rotatably arranged in the inner cylinder (11), the gears (17) are in engagement with the corresponding racks (20), the gears (17) are provided with winches (18), the winches (18) are provided with traction members (14), and the end portions of the traction members (14) are provided with hangers (15) connected with the mounting frames (9).

5. An in situ soil layer sampling device according to claim 1, wherein, The mounting frame (9) is provided with an annular guide mechanism (16) for guiding the wrapping layer (29) to surround the cylindrical core body, an annular guide groove is formed in the end face of the annular guide mechanism (16), and a channel is formed in the outer side wall of the annular guide mechanism (16) and communicates with the guide groove and the input port.

6. An in situ soil layer sampling device according to claim 1, wherein, Further comprising a mobile frame (1), the mobile frame (1) is provided with a guide frame (33), the guide frame (33) is slidingly provided with a lifting platform (2), the body of the driving motor (3) is connected with the lifting platform (2), and the bottom plate of the mobile frame (1) is provided with an inlet and outlet for the outer cylinder (5) to enter and exit.

7. An in situ soil stratified sampling method, characterized by, The sampling device comprises the sampling device according to any one of claims 1-6, and the steps are as follows: The outer cylinder (5) mounted on the mobile frame (1) is moved to a sampling point, and then the driving motor is started; after the driving motor applies a rotating force to the outer cylinder (5), the outer cylinder (5) gradually enters the soil layer with the aid of the helical blade (6); at this time, the soil is cut into a cylindrical core body by the annular cut formed by the outer cylinder (5) and the inner cylinder (11), and the cylindrical core body enters the inner cylinder (11) while the outer cylinder (5) enters the soil layer; The cylindrical core body applies an outward expanding thrust to the clamping plate (10) through the positioning mechanism, so that the outer diameter of the circular tubular structure formed by the plurality of clamping plates (10) gradually expands, forming a space for accommodating the core body; when the core body drives the lifting seat (7) and the limiting seat (8) to move to the limit position, the plurality of clamping plates (10) clamp and cut the local part of the cylindrical core body; The cylindrical core body continues to move in the inner cylinder (11), and the cylindrical core body continues to move in the vertical direction in the inner cylinder (11) by driving the lifting mechanism through the lifting seat (7) to drive the clamping plate (10) and the cylindrical core body arranged in the clamping plate (10); When the lifting mechanism drives the clamping plate and the cylindrical core body arranged in the clamping plate to continue to move in the inner cylinder (11), the input port on the clamping plate (10) is in communication with the inlet and outlet on the loading cylinder (12), and the wrapping layer (29) performs circumferential motion around the cylindrical core body under the driving of the driving roller, so as to wrap the cylindrical 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 layered coring of the soil layer. After the first coring is completed, the inner cylinder (11) is installed in the outer cylinder (5) again to repeat the operation and perform multiple coring operations.

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