Soil sampling device and sampling method for detecting organic carbon in soil

Abstract

The invention discloses a soil sampling device for detecting organic carbon in soil and a sampling method. The sampling device comprises a handle; the drilling barrel is rotatably arranged on the handle, and spiral blades are arranged on the inner wall of the drilling barrel; the sample box is assembled on the handle, a rotating retainer and a sampling barrel mounted on the retainer are arranged in the sample box, the sample box is further provided with a sample injection hole aligned and attached to the drilling barrel, the sampling barrel rotates along with the retainer and can sequentially pass through the sample injection hole, and the drilling barrel, the sample injection hole and the sampling barrel are kept coaxial; when the drilling barrel collects soil and rotates, in the process that the soil is upwards conveyed to the sampling barrels, the retainer intermittently rotates to enable the sampling barrels to sequentially pass through the sample injection holes and keep coaxial with the drilling barrel and the sample injection holes, and soil at different depths in the drilling barrel is conveyed to different sampling barrels to be collected and stored; and continuous and layered collection of soil at different depth levels in the same place can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil detection, and in particular relates to a soil sampling device and a sampling method for detecting soil organic carbon. Background Art

[0002] The concept of soil organic matter refers to the collective name of humus, plant and animal residues and microorganisms formed by the action of microorganisms. The carbon content in them is soil organic carbon. Soil organic carbon is divided into easily decomposable organic carbon, difficult to decompose organic carbon and inert organic carbon according to the availability of microorganisms. Easily decomposable organic carbon has a higher bioavailability and loss rate, while difficult to decompose organic carbon has a higher residual rate.

[0003] Clarify the effects of different grassland management on soil microbial water and carbon utilization efficiency, analyze the coupling effects of different grassland management on soil water and carbon and their driving factors, and reveal the impact of long-term different grassland management on soil organic carbon sequestration in desert steppes and its regulation mechanism from the perspective of microbial water use efficiency. This can provide a theoretical basis for grassland ecological protection, formulation of grassland management policies, sustainable use of grassland resources and mitigation of climate change.

[0004] To test soil organic carbon, it is necessary to take a sample of the soil, dry it, grind it, mix it with water, and then use the detection reagent combined with the detection method.

[0005] Single soil sampling is generally not representative, so when conducting soil organic carbon testing, multi-point sampling or soil at different depths is usually used to conduct organic carbon testing to comprehensively evaluate the organic carbon content of the soil. Multi-point sampling cannot be achieved in one sampling due to the transfer of sampling points, while soil at different depths can be sampled at the same location, but there are few records of sampling devices in this regard in the prior art. Summary of the invention

[0006] In view of the above technical problems, this application proposes a soil sampling device and a sampling method for soil organic carbon detection. The specific technical solutions are as follows:

[0007] Soil sampling device for soil organic carbon detection, including:

[0008] handle;

[0009] A drill barrel, the drill barrel is rotatably arranged on a handle, and the inner wall of the drill barrel has spiral blades;

[0010] A sample box, the sample box is assembled on the handle, a rotating holder and a sampling tube mounted on the holder are arranged inside the sample box, the sample box is also provided with a sampling hole aligned with the drill tube, the sampling tube rotates with the holder and can pass through the sampling hole in sequence and keep the drill tube, the sampling hole and the sampling tube coaxial;

[0011] When the drill tube collects soil and rotates, the soil is transported upward to the sampling tube. During the process, the retaining frame rotates intermittently so that the sampling tube passes through the sampling hole in sequence and remains coaxial with the drill tube and the sampling hole. Soil at different depths in the drill tube is respectively transported to different sampling tubes for collection and storage.

[0012] Furthermore, it also includes a power component 2 fixed on the handle, the power component 2 includes a shell, gear 1, gear 2 and a motor, the gear 1 and gear 2 are meshed with each other and installed in the shell, the motor is fixed to the outside of the shell, and the rotating shaft of the motor is fixed to the gear 2, and the drill tube passes through the shell and is fixed to the gear 1.

[0013] Furthermore, balls are arranged in the gap between the gear one and the housing, and the balls are arranged in a ring shape around the rotating shaft of the gear one.

[0014] Furthermore, the sample box includes a box body 1 and a box body 2 that are detachably connected;

[0015] A rotatable connector and a lever fixed on the connector are installed on the box body, and the rotating shaft of the connector is the same as that of the retaining frame;

[0016] A rotatable retaining frame is installed on the box body 2;

[0017] The sampling cylinder comprises a cylinder body and a movable plate slidably arranged in the cylinder body, a limiting portion for limiting the rotation of the movable plate is arranged between the movable plate and the cylinder body, and a blocking portion is arranged on the movable plate;

[0018] When the sampling cylinder is unloaded, the movable plate and the blocking part are located inside the cylinder body, and the blocking part is arranged along the radial direction of the retaining frame; when the soil is transported upward to the sampling cylinder, the movable plate and the blocking part are lifted up so that the blocking part extends to the rotation path of the lever, so that the lever contacts the blocking part and drives the sampling cylinder to rotate.

[0019] Furthermore, the retaining frame has fixed parts which are centrally symmetrically distributed with the rotating shaft as the center, and the sampling tube is rotatably installed in the fixed parts;

[0020] The second box body is provided with a special-shaped strip hole, the special-shaped strip hole includes a concentric segment and a tangent segment, the concentric segment and the tangent segment are arcs of equal diameter, the center of the concentric segment coincides with the rotating shaft of the retaining frame, the tangent segment is tangent to the concentric segment, and the center of the tangent segment, the tangent point between the tangent segment and the concentric segment, and the center of the second box body are collinear, the distance between the center of the tangent segment and the injection hole is equal to the distance between adjacent fixing parts, and the end of the tangent segment also has an expansion hole, the diameter of the expansion hole is greater than the width of the concentric segment and the tangent segment;

[0021] A movable pin connected by a spring is arranged on the side wall of the sampling tube, and an end of the movable pin close to the second box body is provided with an enlarged portion, the maximum diameter of the enlarged portion is smaller than the diameter of the expansion hole, and the movable pin can move along the axial direction of the sampling tube. Under normal conditions, the spring exerts a force on the movable pin so that the enlarged portion is located in the sample box;

[0022] Before sampling, the expanded portion is located outside the sample box through the expansion hole so that the movable pin is embedded in the special-shaped strip hole; during sampling, the push rod contacts the blocking portion and drives the sampling tube to rotate from the injection hole to the tangent section. When the sampling tube rotates to deflect the blocking portion to the rotation path of the separation rod, the movable pin slides into the expansion hole and slides out of the expansion hole.

[0023] Furthermore, it also includes a power assembly 1 fixed on the handle, and the power assembly 1 includes:

[0024] An inner sheath fixed on the handle, wherein a deformation seam is provided at one end of the inner sheath close to the sample box;

[0025] A telescopic block, which is slidably disposed in the inner sheath, wherein the telescopic block has an embedded motor and has a rotating shaft fixed to the connector;

[0026] An outer sheath, the outer sheath is sleeved on the outside of the inner sheath, an annular protrusion is arranged on the outside of the box body 1, the outer sheath is threadedly connected with the annular protrusion, and an extrusion portion is arranged at one end of the outer sheath away from the sample box;

[0027] When the outer sheath is screwed and connected to the annular protrusion, the extrusion portion generates pressure on the inner sheath to make it shrink inward through the deformation seam, and at the same time clamps and fixes the telescopic block.

[0028] Furthermore, a card slot is provided on the outer wall of the sample box, and a card hook is provided on the handle.

[0029] On the other hand, the present application also provides a sampling method, which uses any of the above-mentioned soil sampling devices for detecting soil organic carbon, and the method comprises the following steps:

[0030] (1) Assemble the soil sampling device completely;

[0031] (2) Make the drill tube vertical to the ground and apply pressure to the drill tube to collect soil at a certain depth, while driving the drill tube to rotate so that the drill tube collects soil and transports it upward;

[0032] (3) while the soil is being transported upward to the sampling tube, the sampling tube is controlled to rotate so that soil at different depths in the drill tube is transported to different sampling tubes for collection and storage;

[0033] (4) Remove the sample box and take out the sampling tube that stores the soil.

[0034] The beneficial effects of the present invention are as follows: the soil sampling device of the present application can realize the continuous and layered collection of soil at different depths at the same location, the surface soil is collected and stored first, and the deep soil is collected later. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Shown is a schematic diagram of the structure of a soil sampling device;

[0036] Figure 2 Shown is a schematic diagram of the exploded structure of the sample box;

[0037] Figure 3 Shown is a schematic diagram of the structure of the cage;

[0038] Figure 4 What is shown is the structural schematic diagram of the box body 2;

[0039] Figure 5 Shown is an exploded schematic diagram of box body 1;

[0040] Figure 6 What is shown is the structural schematic diagram of the sampling tube;

[0041] Figure 7 The figure shows the matching state of the box body 2, the retaining frame and the sampling tube;

[0042] Figure 8 What is shown is a schematic diagram of the state of the irregular strip hole;

[0043] Fig. 9 Shown is a schematic diagram of the assembly of the movable pin on the outer wall of the cylinder;

[0044] Fig.10 The structure diagram of the power module 1 is shown.

[0045] Fig.11 Shown is a schematic diagram of the structure of the outer sheath;

[0046] Fig.12 It is shown that Figure 1 A partial enlarged view of the middle A;

[0047] Fig.13 Shown is a schematic diagram of the assembly of the drill tube;

[0048] Fig.14 What is shown is the structural schematic diagram of power component two. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0050] Example

[0051] Figure 1 What is shown is a schematic diagram of the structure of the soil sampling device in the present application, which includes a handle 100, a sample box 200 and a drill tube 300. The sample box 200 and the drill tube 300 are both installed on the handle 100. The handle 100 is used for holding during soil sampling and for applying a certain degree of pressure to facilitate pressing the drill tube 300 into the soil for sampling; the drill tube 300 has holes at both ends along its axial direction. When in use, the upper end hole of the drill tube 300 is connected to the sample box 200, so that the collected soil can be transported to the sample box 200 for storage.

[0052] Figure 2 The exploded structure of the sample box 200 is shown. The sample box 200 is detachably connected to the handle 100 so as to facilitate taking out the soil inside the sample box 200 after the soil sampling is completed.

[0053] The sample box 200 includes a box body 1 201 and a box body 202 which can be spliced ​​together. When the box body 1 201 and the box body 202 are spliced ​​together, a complete box body with a accommodating cavity inside is formed. The box body 1 201 and the box body 202 can be separated and disassembled to remove the soil; the box body 1 201 and the box body 2 202 can be connected and spliced ​​by common threaded screwing, bolt fastening and other methods.

[0054] A rotatable retaining frame 210 and a sampling barrel 220 are arranged in the box body, wherein the retaining frame 210 has a plurality of fixing portions 211 arranged in a central symmetrical manner, each fixing portion 211 fixes a sampling barrel 220, so that the box body can accommodate a plurality of sampling barrels 220 arranged in a central symmetrical manner, and the sampling barrels 220 can change positions alternately following the rotation of the retaining frame 210.

[0055] When the empty sampling tube 220 is fixed in the sample box 200, by keeping one of the sampling tubes 220 aligned with the upper opening of the drill tube 300, the drill tube 300 is pressed downward to allow the soil to enter the sampling tube 220 through the drill tube 300. When the sampling tube 220 is filled with soil, the retaining frame 210 moves out the sampling tube 220 filled with soil by rotating, and at the same time moves the adjacent empty sampling tube 220 in to align with the upper opening of the drill tube 300, so that the soil in the drill tube 300 enters the sampling tube 220 again. This cycle is repeated until all the sampling tubes 220 are filled with soil or all the soil in the drill tube 300 is collected and stored.

[0056] Through the above-mentioned soil collection process, the continuous and layered collection of soil at different depths at the same location can be achieved. Combined with the soil collection process, the surface soil is collected and stored first, and the deep soil is collected later.

[0057] In some specific embodiments, the retaining frame 210 is configured as follows: Figure 3 As shown in the structure, the retaining frame 210 includes a fixing portion 211, a connecting portion 212 and a turntable 213. The fixing portion 211 is fixedly connected to the turntable 213 via the connecting portion. The fixing portion 211 is configured as a cylindrical casing that matches the sampling tube 220, so that the sampling tube 220 can be directly embedded in the fixing portion 211. In addition, a through hole 214 is also provided at the center of the turntable 213 for connection with the box body 202. An annular groove 215 is provided on the outer side of the through hole 214. When assembled, the annular groove 215 fits the box body 202.

[0058] Figure 4 The structure diagram of the second box body 202 is shown. The center of the second box body 202 is provided with a second through hole 203 corresponding to the first through hole 214, and the outer side of the second through hole 203 is provided with a second annular groove 204 corresponding to the first annular groove 215; Figure 2 During assembly, the through hole 1 214 is aligned with the through hole 203, the annular groove 1 215 is aligned with the annular groove 204, a ball 231 is arranged between the annular groove 1 215 and the annular groove 204, and the bolt 232 passes through the through hole 1 214 and the through hole 203 to connect the box body 202 and the turntable 213 together. Under the action of the ball 231, the turntable 213 can still maintain relative rotation with the box body 202.

[0059] The box body 202 is also provided with a sampling hole 205 and a special-shaped strip hole 206, wherein the sampling hole 205 cooperates with the drill barrel 300. During assembly, the drill barrel 300 needs to be aligned with the sampling hole 205 so that the soil in the drill barrel 300 can enter the sample box 200; the special-shaped strip hole 206 is used to cooperate with the control of the displacement of the sampling barrel 220.

[0060] Figure 5 What is shown is an exploded schematic diagram of a box body 201, wherein the top of the box body 201 has a through hole 3 207, in which a rotatable connector 241 is installed, one end of the connector 241 is located outside the box body 201, and the other end is located inside the box body 201, and the end of the connector 241 located inside the box body 201 is connected to a lever 242, that is, the lever 242 is located inside the sample box 200 when assembled.

[0061] In addition, an annular protrusion 208 is also provided on the outside of the box body 1 201 . The annular protrusion 208 is located outside the through hole 3 207 and the two are coaxial. An external thread is provided on the outside of the annular protrusion 208 .

[0062] Figure 6What is shown is a schematic diagram of the structure of the sampling barrel 220, which includes a barrel 221, a movable plate 222 and a movable pin 223, wherein the barrel 221 matches the rotational cooperation relationship with the fixed part 211, and its outer side wall should also be set to be circular, the movable plate 222 is set in the barrel 221 and can move axially along the barrel 221 inside the barrel 221, the movable pin 223 is set on the outside of the barrel 221 and connected to the barrel 221, and the axial direction of the movable pin 223 is parallel to the axial direction of the barrel 221, so that the movable pin 223 can move axially along the barrel 221.

[0063] The rotation of the movable plate 222 and the cylinder 221 is restricted.

[0064] For example, a limit portion 225 is provided at the edge of the movable plate 222, which may be as described in the present application. Figure 6 Correspondingly, a protruding structure cooperating with the limiting portion 225 is also provided on the inner wall of the cylinder 221, so that after the movable plate 222 is assembled into the cylinder 221, the protruding structure can fill in the gap, thereby limiting the rotation of the movable plate 222 in the cylinder 221.

[0065] A protruding blocking portion 224 is also provided on the movable plate 222 . When the movable plate 222 moves axially to the top of the cylinder 221 , the blocking portion 224 extends out of the cylinder 221 .

[0066] Figure 7 What is shown is a schematic diagram of the matching state of the box body 202, the retaining frame 210 and the sampling barrel 220. In the figure, the sampling barrel 220 is marked as A\B\C\D according to different positions, wherein the A sampling barrel 220 corresponds to the sampling hole 205. Before sampling, the movable plate 222 is located at the bottom of the barrel 221. During sampling, the drill barrel 300 and the barrel 221 are perpendicular to the ground. As the soil in the drill barrel 300 enters the A sampling barrel 220, the movable plate 222 in the A sampling barrel 220 will gradually be squeezed and lifted by the soil until the blocking portion 224 extends out of the barrel 221; the lever 242 above the retaining frame 210 is always kept rotating. When the blocking portion 224 rises to a certain position, it will block the lever 242 from rotating. Therefore, when the lever 242 contacts the blocking portion 224, it will drive the A sampling barrel 220 to rotate, and the rotation direction is from B to A.

[0067] Before completing the sampling, the blocking portions 224 on the movable plates 222 in the four sampling cylinders 220 A\B\C\D all maintain radial extension along the box body 202. On the one hand, this is because the limiting portion 225 on the movable plate 222 limits the rotation of the movable plate 222 and the cylinder body 221. On the other hand, the movable pin 223 is embedded in the special-shaped strip hole 206 to limit the rotation of the cylinder body 221 and the fixed portion 211.

[0068] Figure 8 What is shown is a state schematic diagram of the special-shaped strip hole 206, and the dotted line in the figure indicates the number and position of the fixing portion 211 on the exemplary retaining frame 210 of the present application. The special-shaped strip hole 206 includes a concentric segment 206a and a tangent segment 206b, wherein the concentric segment 206a and the tangent segment 206b are arcs of equal diameter, and the concentric segment 206a is coaxial with the box body 202, and the tangent segment 206b is tangent to the concentric segment 206a, and the center of the tangent segment 206b, the tangent point between the tangent segment 206b and the concentric segment 206a, and the center of the box body 202 are collinear, and the distance between the center of the tangent segment 206b and the injection hole 205 is equal to the distance between adjacent fixing portions 211; in addition, the end of the tangent segment 206b also has an expansion hole 206c, and the diameter of the expansion hole 206c is greater than the width of the concentric segment 206a and the tangent segment 206b.

[0069] Fig. 9 What is shown is an assembly schematic diagram of the movable pin 223 on the outer wall of the cylinder 221, a fixed block 226 is arranged on the outer wall of the cylinder 221, a through hole 227 is arranged on the fixed block 226 to accommodate the movable pin 223, a spring 228 is arranged in the through hole 227, one end of the spring 228 is fixed on the side wall of the through hole 227, and the other end is fixed on the movable pin 223, and under normal conditions, the force of the spring 228 makes the lower end of the movable pin 223 close to the fixed block 226; the lower end of the movable pin 223 is arranged as an enlarged portion 229, and the maximum diameter of the enlarged portion 229 is smaller than the diameter of the expansion hole 206c, so that the enlarged portion 229 can pass through the expansion hole 206c.

[0070] Combination Figures 7 to 9 , assemble the sampling cylinder 220 on the holder 210, and keep one of the fixed parts 211 on the holder 210 empty, then rotate the holder 210 to align the empty fixed part 211 with the injection hole 205, rotate the sampling cylinder 220 at the tangent section 206b and align the movable pin 223 with the expansion hole 206c, press the movable pin 223 to make the enlarged part 229 pass through the expansion hole 206c, and then rotate the sampling cylinder 220 again to make the movable pin 223 pass through the tangent section 206b enters the concentric section 206a, and the sampling tube 220 in the sampling tube 220 will extend radially along the box body 202; the retaining frame 210 is rotated again to align the sampling tube 220 that has undergone the above operation with the injection hole 205, so that the sampling tube 220 that has not undergone the above operation enters the tangential section 206b again, and the above operation is repeated until all the sampling tubes 220 have undergone the above operation and finally the unloaded fixing portion 211 is aligned with the tangential section 206b.

[0071] When soil sampling is performed, as the soil enters the sampling tube 220 through the sampling hole 205, the movable plate 222 in the sampling tube 220 is lifted up until the lever 242 contacts the blocking portion 224 to drive the retaining frame 210 to rotate, so that the sampling tube 220 storing the soil moves to the tangent section 206b. At this point, since the tangent section 206b is connected to the concentric section 206a, the sampling tube 220 rotates at the original position, and the corresponding blocking portion 224 is deflected, and the movable pin 223 slides into the tangent section 206b until the blocking portion 224 is deflected to no longer block the rotation of the lever 242. At the same time, the movable pin 223 slides into the expansion hole 206c. Due to the action of the spring 228, the movable pin 223 shrinks upward and slides out of the expansion hole 206c into the sample box 200. At this point, the sampling tube 220 that has collected and stored the soil will neither hinder the rotation of the lever 242 nor the rotation of the retaining frame 210.

[0072] As the holder 210 rotates, the empty sampling tube 220 at the back will move to the sampling hole 205 to collect and store soil; this can be repeated to continuously collect soil at different depths through different sampling tubes 220 and store them separately.

[0073] The handle 100 is also provided with a power assembly 400 , which is fixed on the handle 100 to provide power for the lever 242 to continuously rotate. Fig.10 The structure diagram of the power assembly 400 is shown. Figure 1 The power assembly 400 includes a telescopic block 401, an inner sleeve 402 and an outer sleeve 403, wherein the telescopic block 401 is slidably arranged in the inner sleeve 402, the inner sleeve 402 is fixed on the handle 100, and the outer sleeve 403 is sleeved on the outside of the inner sleeve 402. The telescopic block 401 has an embedded motor, so it has a rotating shaft 404 for outputting torque. The rotating shaft 404 is rectangular, and the corresponding connector 241 has a rectangular groove matching the rotating shaft 404, so that the rotating shaft 404 can be embedded in the connector 241 to drive the connector 241 to rotate.

[0074] An internal thread is provided on the inner wall of one end of the outer sheath 403 close to the annular protrusion 208 to cooperate with the annular protrusion 208. During assembly, the sample box 200 is fixed on the handle 100, and the injection hole 205 of the sample box 200 is kept aligned and fit with the drill tube 300. Then, the telescopic block 401 is slid to connect the rotating shaft 404 with the connector 241, and the outer sheath 403 and the annular protrusion 208 are tightened and fixed by threads.

[0075] Fig.11The figure shows a schematic diagram of the structure of the outer sheath 403. The inner wall of the upper end of the outer sheath 403 has a protruding extrusion portion 403a. A deformation gap 402a is provided at one end of the inner sheath 402 close to the sample box 200. When the outer sheath 403 and the annular protrusion 208 are screwed together, the extrusion portion 403a exerts pressure on the inner sheath 402 to make it shrink inward through the deformation gap 402a, thereby clamping and fixing the telescopic block 401. In this process, the outer sheath 403 and the annular protrusion 208 are screwed together and fixed together. The screwing-in process of the outer sleeve 403 causes the extrusion part 403a to be displaced and continuously apply pressure to the deformation joint 402a to compress and fix the telescopic block 401, thereby fixing the telescopic block 401, the inner sleeve 402 and the outer sleeve 403 together; on the other hand, the threaded cooperation mode of the outer sleeve 403 and the annular protrusion 208 converts the rotational torque into a linear torque that the extrusion part 403a continuously applies pressure to the deformation joint 402a, which makes the operation more labor-saving and can also keep the extrusion part 403a continuously applying pressure to the deformation joint 402a.

[0076] Fig.12 yes Figure 1 In the partial enlarged view of the A in the middle, a slot 240 is provided on the outer wall of the sample box 200, and a hook 101 is provided on the handle 100. When assembling, the hook 101 is inserted into the slot 240. On the one hand, the sample box 200 can be positioned to ensure that the position of the injection hole 205 of the sample box 200 is aligned with the drill tube 300, and on the other hand, it is used to assist in fixing the sample box 200.

[0077] Fig.13 What is shown is an assembly diagram of a drill barrel 300, wherein a spiral blade 301 is arranged inside the drill barrel 300, and when the drill barrel 300 is rotated, the soil drilled inside can be transported upward, and a power component 2 320 is arranged outside the drill barrel 300, and the power component 2 320 can drive the drill barrel 300 to rotate.

[0078] Fig.14 What is shown is a schematic diagram of the structure of the power component 2 320, which includes a housing 321, a gear 1 322, a gear 2 323 and a motor 324. The gear 1 322 and the gear 2 323 are meshed with each other and are installed in the housing 321. The motor 324 is fixed to the outside of the housing, and the rotating shaft of the motor 324 is fixed to the gear 2 323. The gear 1 322 is fixed to the drill barrel 300. When the motor 324 is working, the drill barrel 300 can be driven to rotate through the gear 1 322 and the gear 2 323.

[0079] In addition, in order to ensure the stability of the power assembly 2 320, balls are provided on both sides of the gear 1 322 to keep the position of the gear 1 322 stable, prevent it from moving and reduce friction.

[0080] On the other hand, the present application provides a sampling method based on the soil sampling device described above, and the sampling method comprises the following steps:

[0081] (1) Assemble the soil sampling device completely;

[0082] (2) making the drill tube 300 perpendicular to the ground and applying pressure to the drill tube 300 to collect soil at a certain depth, and driving the drill tube 300 to rotate so that the drill tube 300 collects soil and transports it upward;

[0083] (3) While the soil is being transported upward to the sampling tube 220, the sampling tube 220 is controlled to rotate so that soil at different depths in the drill tube 300 is transported to different sampling tubes 220 for collection and storage;

[0084] (4) Remove the sample box 200 and take out the sampling cylinder 220 storing the soil.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A soil sampling device for detecting soil organic carbon, characterized in that: include: handle; A drill barrel, the drill barrel is rotatably arranged on a handle, and the inner wall of the drill barrel has spiral blades; A sample box, the sample box is assembled on the handle, a rotating holder and a sampling tube mounted on the holder are arranged inside the sample box, the sample box is also provided with a sampling hole aligned with the drill tube, the sampling tube rotates with the holder and can pass through the sampling hole in sequence and keep the drill tube, the sampling hole and the sampling tube coaxial; When the drill tube collects soil and rotates, the soil is transported upward to the sampling tube. During the process, the retaining frame rotates intermittently so that the sampling tube passes through the sampling hole in sequence and remains coaxial with the drill tube and the sampling hole. Soil at different depths in the drill tube is respectively transported to different sampling tubes for collection and storage.

2. The soil sampling device for detecting soil organic carbon according to claim 1, characterized in that: It also includes a power assembly 2 fixed on the handle, the power assembly 2 includes a shell, gear 1, gear 2 and a motor, the gear 1 and gear 2 are meshed with each other and installed in the shell, the motor is fixed to the outside of the shell, and the rotating shaft of the motor is fixed to the gear 2, and the drill tube passes through the shell and is fixed to the gear 1.

3. The soil sampling device for detecting soil organic carbon according to claim 2, characterized in that: Balls are arranged in a gap between the gear 1 and the housing, and the balls are arranged in a ring shape around the rotating shaft of the gear 1.

4. The soil sampling device for detecting soil organic carbon according to claim 1, characterized in that: The sample box comprises a box body 1 and a box body 2 which are detachably connected; A rotatable connector and a lever fixed on the connector are installed on the box body, and the rotating shaft of the connector is the same as that of the retaining frame; A rotatable retaining frame is installed on the box body 2; The sampling cylinder comprises a cylinder body and a movable plate slidably arranged in the cylinder body, a limiting portion for limiting the rotation of the movable plate is arranged between the movable plate and the cylinder body, and a blocking portion is arranged on the movable plate; When the sampling cylinder is unloaded, the movable plate and the blocking part are located inside the cylinder body, and the blocking part is arranged along the radial direction of the retaining frame; when the soil is transported upward to the sampling cylinder, the movable plate and the blocking part are lifted up so that the blocking part extends to the rotation path of the lever, so that the lever contacts the blocking part and drives the sampling cylinder to rotate.

5. The soil sampling device for detecting soil organic carbon according to claim 4, characterized in that: The retaining frame has fixed parts that are centrally symmetrically distributed with the rotating shaft as the center, and the sampling tube is rotatably installed in the fixed parts; The second box body is provided with a special-shaped strip hole, the special-shaped strip hole includes a concentric segment and a tangent segment, the concentric segment and the tangent segment are arcs of equal diameter, the center of the concentric segment coincides with the rotating shaft of the retaining frame, the tangent segment is tangent to the concentric segment, and the center of the tangent segment, the tangent point between the tangent segment and the concentric segment, and the center of the second box body are collinear, the distance between the center of the tangent segment and the injection hole is equal to the distance between adjacent fixing parts, and the end of the tangent segment also has an expansion hole, the diameter of the expansion hole is greater than the width of the concentric segment and the tangent segment; A movable pin connected by a spring is arranged on the side wall of the sampling tube, and an end of the movable pin close to the second box body is provided with an enlarged portion, the maximum diameter of the enlarged portion is smaller than the diameter of the expansion hole, and the movable pin can move along the axial direction of the sampling tube. Under normal conditions, the spring exerts a force on the movable pin so that the enlarged portion is located in the sample box; Before sampling, the expanded portion is located outside the sample box through the expansion hole so that the movable pin is embedded in the special-shaped strip hole; during sampling, the push rod contacts the blocking portion and drives the sampling tube to rotate from the injection hole to the tangent section. When the sampling tube rotates to deflect the blocking portion to the rotation path of the separation rod, the movable pin slides into the expansion hole and slides out of the expansion hole.

6. The soil sampling device for detecting soil organic carbon according to claim 4, characterized in that: It also includes a power assembly 1 fixed on the handle, and the power assembly 1 includes: An inner sheath fixed on the handle, wherein a deformation seam is provided at one end of the inner sheath close to the sample box; A telescopic block, which is slidably disposed in the inner sheath, wherein the telescopic block has an embedded motor and has a rotating shaft fixed to the connector; An outer sheath, the outer sheath is sleeved on the outside of the inner sheath, an annular protrusion is arranged on the outside of the box body 1, the outer sheath is threadedly connected with the annular protrusion, and an extrusion portion is arranged at one end of the outer sheath away from the sample box; When the outer sheath is screwed and connected to the annular protrusion, the extrusion portion generates pressure on the inner sheath to make it shrink inward through the deformation seam, and at the same time clamps and fixes the telescopic block.

7. The soil sampling device for detecting soil organic carbon according to claim 1, characterized in that: A card slot is arranged on the outer wall of the sample box, and a card hook is arranged on the handle.

8. A sampling method, characterized in that: The sampling method uses the soil sampling device for detecting soil organic carbon according to any one of claims 1 to 7, and the method comprises the following steps: (1) Assemble the soil sampling device completely; (2) Make the drill tube vertical to the ground and apply pressure to the drill tube to collect soil at a certain depth, while driving the drill tube to rotate so that the drill tube collects soil and transports it upward; (3) while the soil is being transported upward to the sampling tube, the sampling tube is controlled to rotate so that soil at different depths in the drill tube is transported to different sampling tubes for collection and storage; (4) Remove the sample box and take out the sampling tube that stores the soil.

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