Grassland carbon sink survey sample collection equipment

Abstract

The utility model belongs to the technical field of carbon sink metering and monitoring, particularly relates to grassland carbon sink survey sample collection equipment, and provides the following scheme aiming at the problems that the existing equipment is difficult in hard soil sampling, easy in sample pollution and strenuous in operation: the grassland carbon sink survey sample collection equipment comprises a frame body assembly and a sampling assembly, height self-adaptive adjustment of the frame body assembly is achieved through an elastic inserting structure of an L-shaped connecting rod and a supporting pipe, dynamic adjustment can be achieved according to the soil hardness, clamping stagnation caused by hard soil is avoided, a sampling gear ring with forward and reverse cutting teeth is arranged at the bottom of a sampling barrel of the sampling assembly, forward and reverse rotation alternate cutting is supported, and the sampling efficiency is improved. The soil sampling device effectively crushes the hard soil layer and reduces the operation resistance, and the collection assembly in the sampling barrel unfolds the collection bag layer by layer in the sampling process through the matching of the sleeving bottom ring, the barrel-shaped collection bag and the annular elastic bandage, so that independent packaging of soil samples with different depths is ensured, and hierarchical mixed pollution is prevented.

Description

Technical Field

[0001] This utility model relates to a data collection device, specifically a sample collection device for grassland carbon sequestration surveys, belonging to the field of carbon sequestration measurement and monitoring technology. Background Technology

[0002] Grassland carbon sequestration surveys are a crucial step in accurately assessing the carbon sequestration capacity of grassland ecosystems and serving the national "dual carbon" strategy. The core of these surveys lies in obtaining undisturbed, untouched soil samples that accurately reflect the distribution of underground carbon reserves. Traditional soil sampling methods, and even some previously improved patented technologies, often fall short in terms of sampling efficiency, sample quality, and ease of operation when dealing with the diverse soil conditions of grasslands, especially hard or compacted soil layers.

[0003] In existing technologies, such as the forest soil carbon sequestration metering and monitoring device and method disclosed in CN119470772A, a scheme combining hydraulic drive, a rotary digging shovel, and a sampling cylinder is provided. Driven by a servo motor and transmission structure, this device causes multiple digging shovels to rotate around the axis of the sampling cylinder, separating the soil inside the sampling cylinder from the surrounding soil, and completely extracting a cylindrical soil sample under the support of the digging shovels. This aims to ensure the accuracy of forest soil carbon sequestration metering and monitoring data. However, this device has a complex structure, relying on large components such as a vehicle body and hydraulic cylinders. In open but potentially complex terrain environments like grasslands, its mobility is poor, operation is cumbersome, and the high cost hinders widespread deployment. More importantly, its sampling process focuses on the overall extraction of soil samples, lacking an effective, real-time sample stratification and isolation mechanism. During extraction and preservation, there remains a risk of mixing between upper and lower soil layers, a significant drawback for surveys requiring precise analysis of the vertical distribution of carbon density in different soil layers. Furthermore, the device lacks a labor-saving design specifically for cutting hard soil. For example, the distributed forest carbon sink detection collection device disclosed in announcement number CN222419691U focuses on gas collection and detection. Through a structure including a device housing, hydraulic rod, air pump, detection box, suction fan, heating plate, and semiconductor cooling chip, it extracts, processes, and detects carbon sink gases. Its advantage lies in its integrated gas detection capabilities, but its application is for gas samples, not solid soil samples. For grassland carbon sink surveys requiring analysis of soil organic carbon storage, the core technology of this device does not involve soil cutting, collection, and stratified preservation, thus failing to solve the core challenges in the soil sampling process. In addition, some advanced grassland carbon sink monitoring systems, such as the CS40 grassland ecosystem carbon sink automatic measurement system, have achieved high-frequency continuous automatic measurement of grassland carbon flux based on the static box method and high-precision carbon dioxide sensors, providing strong data support for assessing grassland carbon sink function. However, their technical approach mainly focuses on surface flux monitoring and does not involve the drilling and collection of soil samples. Utility Model Content

[0004] This invention provides a grassland carbon sequestration survey sample collection device to solve the problems of difficult hard soil sampling, easy sample contamination, and laborious operation of the above-mentioned equipment.

[0005] This utility model achieves the above objectives through the following technical solution: a grassland carbon sequestration survey sample collection device, comprising a frame assembly and a sampling assembly, wherein the sampling assembly is movably mounted on the frame assembly, and the sampling assembly includes a sampling tube, wherein a collection assembly is placed inside the sampling tube;

[0006] The frame assembly includes a threaded sleeve, an L-shaped connecting rod, and a support tube. The vertical end of the L-shaped connecting rod is elastically inserted into the support tube, and the L-shaped connecting rod is symmetrically fixedly connected to both sides of the threaded sleeve.

[0007] A threaded rotating rod is connected to the top center of the sampling tube. The rod body is threaded into the threaded sleeve. A sampling toothed ring is connected to the bottom of the sampling tube. Several forward cutting teeth are connected to the bottom of the sampling toothed ring. A reverse cutting tooth is fixedly connected to the back of each forward cutting tooth.

[0008] The collection assembly includes a bottom ring and a cylindrical collection bag. The bottom ring is movably fitted onto the sampling toothed ring, and the cylindrical collection bag is folded and fitted onto the bottom ring.

[0009] The frame assembly also includes a positioning bottom ring that is attached to the surface of the sampling area. The positioning bottom ring is located directly below the sampling tube, and the inner diameter of the positioning bottom ring and the outer diameter of the cylindrical sampling tube are in clearance fit.

[0010] Positioning base plates are symmetrically fixedly connected to both sides of the positioning base ring. The bottom end of the support tube is fixedly connected to the positioning base plate, and the connection position of the support tube is located at the end of the positioning base plate close to the positioning base ring. Ground nails are fixedly connected to the lower surface of the positioning base plate.

[0011] An upper limit ring is fixedly fitted on the vertical rod outside the support tube of the L-shaped connecting rod. The end of the L-shaped connecting rod inserted into the support tube is fixedly connected to a bottom limit plate, and a compressed strong spring is fitted on the rod inside the support tube of the L-shaped connecting rod.

[0012] As a further improvement of this utility model: a docking sleeve is fixedly connected to the top center of the sampling tube, the bottom end of the threaded rotating rod is movably inserted into the docking sleeve, and a pin is connected through the docking part of the threaded rotating rod and the docking sleeve.

[0013] As a further scheme of the utility model: the outer wall of the ring body of the sampling tooth ring is a stepped surface with three gradually increasing diameters from top to bottom, the uppermost stepped surface of the sampling tooth ring is provided with friction stripes, the sleeving bottom ring is sleeved on the uppermost stepped surface of the sampling tooth ring, the middle stepped surface of the sampling tooth ring is provided with a threaded ring, the sampling cylinder is screwed with the threaded ring of the middle stepped surface, and the outer diameter of the sampling cylinder is equal to the diameter of the lowermost stepped surface of the sampling tooth ring.

[0014] As a further scheme of the utility model: the cylinder wall of the sampling cylinder is provided with a plurality of spiral guide grooves, the cylinder wall part of the sampling cylinder screwed with the sampling tooth ring is screw-connected with locking screws, the locking screws are arranged in one of the spiral guide grooves in a concave manner, and the spiral guide grooves are arranged in one-to-one correspondence with the forward cutting teeth.

[0015] As a further scheme of the utility model: the top end of the threaded rotating rod is fixedly connected with a rotating handle.

[0016] As a further scheme of the utility model: the outer wall of the ring body of the sleeving bottom ring is formed into two stepped surfaces with increasing diameters from top to bottom, the upper stepped surface of the sleeving bottom ring is symmetrically provided with clamping through grooves, the ring body of the sleeving bottom ring is sleeved with an annular elastic bandage at the part provided with the clamping through grooves, and the annular elastic bandage clamps a cylindrical collecting bag with the sleeving bottom ring.

[0017] The utility model has the advantages of:

[0018] 1. The elastic insertion structure of the L-shaped connecting rod and the supporting pipe in the frame assembly cooperates with the strong spring, the upper limiting ring and the bottom limiting plate, so that the whole device has high elastic adjustment capacity; when the sampling cylinder encounters hard soil layer resistance, the frame assembly can be compressed or lifted to store and release elastic potential energy, allowing the operator to realize progressive cutting through multiple rotations, avoiding the device from being stuck, damaged or the sampling cylinder from being deformed due to forced pressing, and greatly improving the adaptability and reliability under complex soil conditions.

[0019] 2. The sampling tooth ring is provided with forward cutting teeth and reverse cutting teeth, and the transmission of the threaded rotating rod and the threaded sleeve enables the sampling cylinder to have bidirectional rotary cutting function; under hard soil conditions, the operator can alternately rotate forward and reverse, and use the bidirectional teeth to break and loosen the soil; this alternating operation mode can significantly reduce the resistance of single-direction continuous cutting, and the elastic adjustment of the frame assembly ensures that the L-shaped connecting rod can be synchronously pressed to maintain the contact between the cutting teeth and the soil when the sampling cylinder is lifted in reverse rotation, so that labor-saving operation in hard soil sampling is realized, and the labor intensity of the operator is effectively reduced.

[0020] 3,The utility model discloses a collection component middle sleeve joint bottom ring movable sleeve sets on the sampling tooth ring, and the cylindrical collection bag is set with the folding, and utilizes the clamping slot on sleeve joint bottom ring and the annular elastic band to form the fixed and sealing mechanism, and the band passes through the slot and clamps the bag mouth closely with sampling tooth ring in the initial state, along with the continuous entry of the soil sample, the bag body is pushed and is unfolded, when the soil sample accumulates to certain height, sleeve joint bottom ring and bag mouth are integrally lifted and are separated from sampling tooth ring, the annular elastic band is automatically contracted and is tightly gripped on the bag mouth outer wall and realizes the plugging, so that the soil sample of different depth is independently wrapped in the different paragraphs of bag after entering the collection bag, forms the physical isolation, prevents the cross contamination caused by the upper soil particle drop and the lower fresh sample mixing thoroughly, guarantees the original level information and the accuracy of carbon sink data of sample. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is whole structure schematic diagram of the utility model;

[0022] Figure 2 It is frame body component structure schematic diagram of the utility model;

[0023] Figure 3 It is L type connecting rod and support pipe connecting part section structure schematic diagram of the utility model;

[0024] Figure 4 It is screw rod and sampling cylinder butt joint part split state structure schematic diagram of the utility model;

[0025] Figure 5 It is sampling cylinder structure schematic diagram of the utility model;

[0026] Figure 6 It is sampling cylinder and collection component split state structure schematic diagram of the utility model;

[0027] Figure 7 It is sampling tooth ring and sleeve joint bottom ring split state structure schematic diagram of the utility model;

[0028] Figure 8 It is sleeve joint bottom ring and cylindrical collection bag combination state structure schematic diagram of the utility model;

[0029] Figure 9 It is cylindrical collection bag collection soil sample bag body change section structure schematic diagram of the utility model.

[0030] In the diagram: 1. Frame assembly; 11. L-shaped connecting rod; 12. Support tube; 13. Positioning bottom ring; 14. Positioning base plate; 15. Threaded sleeve; 16. Ground nail; 17. Upper limit ring; 18. Bottom limit plate; 19. Strong spring; 2. Sampling assembly; 21. Threaded rotating rod; 22. Sampling cylinder; 23. Connecting sleeve; 24. Pin; 25. Sampling toothed ring; 26. Forward cutting tooth; 27. Reverse cutting tooth; 28. Friction stripe; 29. ​​Threaded ring; 210. Spiral guide groove; 211. Rotating handle; 212. Locking screw; 3. Collection assembly; 31. Sleeve bottom ring; 32. Cylindrical collection bag; 33. Annular elastic strap; 34. Clamping slot. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] like Figures 1 to 9 As shown, a grassland carbon sink survey sample collection device includes a frame assembly 1 and a sampling assembly 2. The sampling assembly 2 is movably installed on the frame assembly 1. The sampling assembly 2 includes a sampling tube 22, and a collection assembly 3 is placed inside the sampling tube 22.

[0034] The frame assembly 1 includes a threaded sleeve 15, an L-shaped connecting rod 11, and a support tube 12. The vertical end of the L-shaped connecting rod 11 is elastically inserted into the support tube 12. The L-shaped connecting rod 11 is symmetrically fixed to both sides of the threaded sleeve 15. The height of the entire frame assembly 1 can be elastically adjusted. In actual sampling, when the sampling tube 22 is rotated and moved downward to cut the soil, if it encounters a hard soil layer, this elastic structure allows the operator to rotate the sampling tube 22 without immediately forcibly moving it downward. Instead, it can achieve multiple and gradual cutting of the hard soil layer by compressing the elastic component, avoiding equipment jamming or damage and improving the sampling success rate under complex soil conditions.

[0035] A threaded rotating rod 21 is connected at the top center of the sampling cylinder 22, the rod body of the threaded rotating rod 21 is threadedly connected in the threaded sleeve 15, the bottom end of the sampling cylinder 22 is connected with a sampling tooth ring 25, the bottom of the sampling tooth ring 25 is connected with a plurality of forward cutting teeth 26, the cutting back surface of each forward cutting tooth 26 is fixedly connected with a reverse cutting tooth 27, the forward cutting tooth 26 and the reverse cutting tooth 27 ensure that the sampling tooth ring 25 at the bottom end of the sampling cylinder 22 has bidirectional cutting ability, under the condition of hard soil, the operator can alternately rotate and reverse the sampling cylinder 22 to perform forward cutting and reverse cutting, this alternating operation mode can effectively break the soil and reduce the resistance of single direction cutting, thereby reducing the physical consumption of the operator, although reversing the sampling cylinder 22 will make it move upward under the effect of the threaded pair, but due to the elastic adjustable characteristics of the frame assembly 1, the frame body of the frame assembly 1 can be lifted before reversing, so that during the reverse cutting process, the sampling cylinder 22 is lifted upward, and the frame assembly 1 is simultaneously pressed downward due to the elastic restoring force, ensuring that the cutting teeth are always in contact with the soil, maintaining the effectiveness of cutting;

[0036] The collecting assembly 3 includes a sleeved bottom ring 31 and a cylindrical collecting bag 32, the sleeved bottom ring 31 is movably sleeved on the sampling tooth ring 25, and the cylindrical collecting bag 32 is folded and sleeved on the sleeved bottom ring 31, in the process that the sampling cylinder 22 penetrates into the soil layer, the cylindrical soil sample cut out will enter and expand the cylindrical collecting bag 32 in turn, and the cylindrical soil sample entering the corresponding bag body part will not contact other parts of the bag body, effectively preventing the upper layer of soil samples from passing through the entire collecting bag, avoiding the upper layer of soil samples from falling and remaining in the lower layer, thereby causing sample contamination.

[0037] Example two

[0038] Based on the improvement of example one:

[0039] As shown in Figure 1 , Figure 2 and Figure 3 , the frame assembly 1 further includes a positioning bottom ring 13 attached to the surface of the sampling area, the positioning bottom ring 13 is located directly below the sampling cylinder 22, and the inner diameter of the positioning bottom ring 13 and the outer diameter of the cylindrical sampling cylinder 22 are gap-fitted, the positioning bottom ring 13 has a guiding and positioning effect in the initial stage of sampling, ensuring that the sampling cylinder 22 can be vertically cut into the predetermined position, preventing the sampling operation from deviating, and the positioning bottom ring 13 can also press the soil around the sampling cylinder 22 when collecting soil samples, avoiding the loose soil around the sampling cylinder 22 from moving downward vertically.

[0040] Further, the positioning bottom ring 13 is fixedly connected with the positioning bottom plate 14 in a symmetrical manner on both sides, and the bottom end of the supporting pipe 12 is fixedly connected to the positioning bottom plate 14, and the connecting position of the supporting pipe 12 is located at one end of the positioning bottom plate 14 close to the positioning bottom ring 13. The lower plate surface of the positioning bottom plate 14 is fixedly connected with the ground nail 16. The positioning bottom plate 14 provides a larger bearing surface, so that the operator can use his body weight to apply downward pressure by stepping on the positioning bottom plate 14, thereby effectively resisting the reaction force generated when the sampling cylinder 22 cuts into the soil, preventing the entire device from tilting or shifting during operation. The ground nail 16 provided can penetrate deep into the soil to provide additional grip to ensure the stability of the device during sampling.

[0041] Further, the vertical rod of the L-shaped connecting rod 11 fixedly sleeved on the outside of the supporting pipe 12 is provided with an upper limiting ring 17, and the end inserted into the supporting pipe 12 is fixedly connected with a bottom limiting plate 18. The rod inserted into the supporting pipe 12 is sleeved with a compression-shaped strong spring 19. The upper limiting ring 17 and the bottom limiting plate 18 jointly constitute a stroke limiting mechanism for the movement of the L-shaped connecting rod 11 in the supporting pipe 12, preventing the L-shaped connecting rod 11 from being completely pulled out of the supporting pipe 12 or being excessively compressed during elastic adjustment, which may cause structural failure. When the sampling cylinder 22 encounters hard soil with increased resistance, the reaction force applied to the threaded sleeve 15 will cause the L-shaped connecting rod 11 to further extend out of the supporting pipe 12, resulting in an increase in the height of the frame assembly 1. When the sampling cylinder 22 is reversed or passes through a hard soil layer, the resistance decreases, and the strong spring 19 releases potential energy to push the L-shaped connecting rod 11 back to the initial position, restoring the height of the frame assembly 1. This allows the device to adapt to changes in soil resistance and ensures that the sampling cylinder 22 can cut in both directions and perform multiple progressive sampling.

[0042] As shown in Figures 1 to 5 The top center of the sampling cylinder 22 is fixedly connected with a docking sleeve 23, and the bottom end of the threaded rotating rod 21 is movably inserted into the docking sleeve 23. The docking part of the threaded rotating rod 21 and the docking sleeve 23 is penetrated and connected with a pin 24. The pin 24 can realize the connection between the threaded rotating rod 21 and the sampling cylinder 22, ensuring that the threaded rotating rod 21 can effectively transmit the rotating torque to the sampling cylinder 22 to smoothly rotate for cutting. At the same time, this connection method is also convenient for disassembly. When it is necessary to replace, clean or transport the sampling cylinder 22, the threaded rotating rod 21 and the sampling cylinder 22 can be separated by pulling out the pin 24.

[0043] Further, the outer wall of the ring body of the sampling tooth ring 25 is a stepped surface with three steps, the uppermost step of the sampling tooth ring 25 is provided with a friction stripe 28, the sleeve bottom ring 31 is sleeved on the uppermost step of the sampling tooth ring 25, the middle step of the sampling tooth ring 25 is provided with a threaded ring 29, the sampling cylinder 22 is threadedly connected with the threaded ring 29 of the middle step, the outer diameter of the sampling cylinder 22 is equal to the diameter of the lowermost step of the sampling tooth ring 25, the friction stripe 28 can increase the friction force of the contact surface of the sleeve bottom ring 31, and can provide static friction force in the initial sleeving to prevent the collection assembly 3 from being accidentally separated due to gravity or slight resistance in the initial sampling, the sampling cylinder 22 is threadedly connected with the threaded ring 29 of the middle step, so that the sampling tooth ring 25 can be conveniently disassembled and replaced, the locking screw 212 is used for further locking after the threaded connection to prevent the sampling tooth ring 25 from loosening in the cutting operation of the forward and reverse rotation alternation, and the outer diameter of the sampling cylinder 22 is equal to the diameter of the lowermost step of the sampling tooth ring 25 to ensure that the outer wall of the combination of the sampling cylinder 22 and the sampling tooth ring 25 is smoothly transitioned to form a continuous cylindrical surface, the friction resistance of the side wall is reduced when cutting into the soil, and the profile of the collected soil sample is regular and will not be damaged due to the existence of the step.

[0044] Further, the cylinder wall of the sampling cylinder 22 is provided with a plurality of spiral guide grooves 210, the cylinder wall part of the sampling cylinder 22 threadedly connected with the sampling tooth ring 25 is threadedly connected with the locking screw 212, the locking screw 212 is arranged in one of the spiral guide grooves 210 in a concave manner, the spiral guide grooves 210 are arranged in one-to-one correspondence with the forward cutting teeth 26, when the sampling cylinder 22 is rotated to cut into the soil, part of the cut soil will move upward along the track of the spiral guide groove 210, the friction and compaction effect between the soil and the inner wall of the sampling cylinder 22 can be reduced, the rotating resistance can be reduced, the whole sampling process is more smooth, the locking screw 212 is arranged in the spiral guide groove 210 in a concave manner, the nut of the locking screw 212 does not protrude from the outer wall of the sampling cylinder 22, so that unnecessary resistance is not increased on the outer wall of the cylinder, and the corresponding arrangement of the spiral guide grooves 210 and the forward cutting teeth 26 can ensure that the cutting action of each cutting tooth is associated with a spiral guide groove 210 to realize the cooperative operation of cutting and soil removal.

[0045] Further, the top end of the threaded rotating rod 21 is fixedly connected with a rotating handle 211, the rotating handle 211 provides a labor-saving and easy-to-force holding point for the operator, so that the operator can generate larger torque with smaller force, thereby more easily driving the sampling cylinder 22 to rotate and cut into the soil.

[0046] As Figures 6 to 9As shown, the outer wall of the ring body of the sleeving bottom ring 31 is configured as two stepped surfaces with increasing diameters from top to bottom, and the upper stepped surface of the sleeving bottom ring 31 is symmetrically provided with a clamping slot 34, and the ring body of the sleeving bottom ring 31 is sleeved with an annular elastic band 33 at the part provided with the clamping slot 34, and the annular elastic band 33 clamps the cylindrical collecting bag 32 between the sleeving bottom ring 31 and the annular elastic band 33 in the initial state. The sleeving bottom ring 31 is sleeved on the uppermost stepped surface of the sampling tooth ring 25, at this time, part of the band body of the annular elastic band 33 will pass through the clamping slot 34, and due to the elastic force, the annular elastic band 33 will be tightly pressed on the friction stripe 28 of the sampling tooth ring 25, so as to tightly clamp the bag opening part of the cylindrical collecting bag 32 between the sleeving bottom ring 31 and the sampling tooth ring 25, preventing the bag body from falling off in the initial sampling stage; with the sampling proceeding, the cylindrical soil sample continuously enters the sampling cylinder 22 and pushes the bottom of the cylindrical collecting bag 32, and the folded bag body is gradually unfolded, and when the soil sample accumulates to a certain height, the upward pushing force will overcome the friction between the annular elastic band 33 and the sampling tooth ring 25, and the sleeving bottom ring 31 will be pushed upward together with the bag opening of the cylindrical collecting bag 32, so as to be separated from the uppermost stepped surface of the sampling tooth ring 25, at this time, the ring body part of the sleeving bottom ring 31 provided with the clamping slot 34 is completely exposed, and the part of the annular elastic band 33 passing through the clamping slot 34 will tightly clamp the bag opening outer wall of the cylindrical collecting bag 32 due to the elastic contraction of the annular elastic band 33, so as to effectively clamp and block the bag opening, and although the clamping and blocking of the annular elastic band 33 may leave a small gap, but for the solid soil sample, it is enough to prevent it from spilling from the bag, and ensures that the cylindrical collecting bag 32 can reliably contain the soil sample in the whole sampling and sampling process, and when the sampling cylinder 22 is finally taken out from the ground, the cylindrical collecting bag 32 filled with soil sample can be taken out from the sampling cylinder 22 together with the sleeving bottom ring 31.

[0047] Working principle: the operator first places the positioning bottom ring 13 of the frame assembly 1 on the surface of the predetermined sampling area, ensures that the sampling cylinder 22 can be aligned with the target point, and then the operator steps on the positioning bottom plate 14 connected on both sides of the positioning bottom ring 13, so that the ground nails 16 on the lower plate surface of the positioning bottom plate 14 penetrate into the soil, thereby stably anchoring the whole device on the ground.

[0048] During the sampling process, the operator drives the threaded rotating rod 21 to rotate by rotating the rotating handle 211 connected to the top end of the threaded rotating rod 21, and since the rod body of the threaded rotating rod 21 is threadedly connected with the threaded sleeve 15 fixed on the frame assembly 1, the rotating motion is converted into linear motion, thereby pushing the sampling cylinder 22 to move downward, and the sampling tooth ring 25 at the bottom end of the sampling cylinder 22 and the forward cutting teeth 26 arranged thereon begin to cut into the soil to perform forward cutting; if hard soil layer is encountered to cause the sampling cylinder 22 to be blocked from moving downward, at this time, the reaction force acting on the threaded sleeve 15 will make the L-shaped connecting rod 11 further extend out of the supporting pipe 12 to overcome the pre-pressing force of the strong spring 19, which is manifested as the height of the entire frame assembly 1 is increased, allowing the operator to continue to rotate the sampling cylinder 22 without forcibly pressing it downward, thereby realizing multiple and progressive grinding and cutting of the hard soil layer; in order to more effectively break the hard soil, the operator can alternately rotate the rotating handle 211 in the forward and reverse directions, at this time, the reverse cutting teeth 27 at the bottom of the sampling tooth ring 25 can cooperate with the forward cutting teeth 26 to perform forward and reverse cutting on the soil, and during the reverse rotation, the frame assembly 1 will be simultaneously pressed downward under the restoring force of the strong spring 19, thereby ensuring that the cutting teeth are kept in contact with the soil;

[0049] The collected soil sample is effectively collected in the collecting assembly 3, in the initial state, the sleeved bottom ring 31 is sleeved on the uppermost stepped surface of the sampling tooth ring 25, and part of the annular elastic band 33 passes through the clamping slot 34 and is tightly pressed on the friction stripes 28 of the sampling tooth ring 25, thereby firmly fixing the cylindrical collecting bag 32; as the soil sample continuously enters the sampling cylinder 22 and pushes the bottom of the cylindrical collecting bag 32, the folded bag body is gradually unfolded, and the soil sample is wrapped in different sections of the bag, thereby effectively preventing the mixing pollution of the upper and lower soil; when the soil sample accumulates to a certain height, the upward pushing force thereof will overcome the friction force between the annular elastic band 33 and the sampling tooth ring 25, thereby pushing the sleeved bottom ring 31 together with the bag opening of the cylindrical collecting bag 32 upward to make the sleeved bottom ring 31 separate from the sampling tooth ring 25; at this time, the part of the ring body of the sleeved bottom ring 31, in which the clamping slot 34 is formed, is completely exposed, and the part of the annular elastic band 33, which passes through the clamping slot 34, will be tightly clamped on the outer wall of the bag opening of the cylindrical collecting bag 32, thereby realizing the clamping and blocking of the bag opening to prevent the soil from spilling.

[0050] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0051] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A grassland carbon sink investigation sample collection device, comprising a frame body assembly (1) and a sampling assembly (2), characterized in that: The sampling assembly (2) is movably mounted on the frame assembly (1), the sampling assembly (2) comprises a sampling cylinder (22), and a collecting assembly (3) is arranged in the sampling cylinder (22); The frame assembly (1) comprises a threaded sleeve (15), an L-shaped connecting rod (11) and a supporting pipe (12), the vertical end of the L-shaped connecting rod (11) is elastically inserted into the supporting pipe (12), and the L-shaped connecting rod (11) is fixedly connected to the two sides of the threaded sleeve (15) in a symmetrical mode. A threaded rotating rod (21) is connected to the top center of the sampling cylinder (22), the rod body of the threaded rotating rod (21) is threadedly connected into the threaded sleeve (15), the bottom end of the sampling cylinder (22) is connected with a sampling tooth ring (25), the bottom of the sampling tooth ring (25) is connected with a plurality of forward cutting teeth (26), the cutting back surface of each forward cutting tooth (26) is fixedly connected with a reverse cutting tooth (27). The collecting assembly (3) comprises a sleeved bottom ring (31) and a cylindrical collecting bag (32), the sleeved bottom ring (31) is movably sleeved on the sampling tooth ring (25), and the cylindrical collecting bag (32) is foldably sleeved on the sleeved bottom ring (31).

2. The grassland carbon sink investigation sample collection device according to claim 1, characterized in that: The frame assembly (1) further comprises a positioning bottom ring (13) attached to the surface of the sampling area, the positioning bottom ring (13) is located directly below the sampling cylinder (22), and the inner diameter of the positioning bottom ring (13) is in clearance fit with the outer diameter of the cylindrical sampling cylinder (22).

3. The grassland carbon sink investigation sample collection device according to claim 2, characterized in that: The two sides of the positioning bottom ring (13) are fixedly connected with a positioning bottom plate (14) in a symmetrical mode, the bottom end of the supporting pipe (12) is fixedly connected to the positioning bottom plate (14), and the connecting position of the supporting pipe (12) is located at one end of the positioning bottom plate (14) close to the positioning bottom ring (13), and the lower plate surface of the positioning bottom plate (14) is fixedly connected with a ground nail (16).

4. The grassland carbon sink investigation sample collection device according to claim 3, characterized in that: An upper limiting ring (17) is fixedly sleeved on the vertical rod of the L-shaped connecting rod (11) located outside the supporting pipe (12), one end of the L-shaped connecting rod (11) inserted into the supporting pipe (12) is fixedly connected with a bottom limiting plate (18), and a strong spring (19) in a compressed mode is sleeved on the rod of the L-shaped connecting rod (11) inserted into the supporting pipe (12).

5. The prairie carbon sink investigation sample collection apparatus of claim 1, wherein: A butt joint sleeve (23) is fixedly connected to the top center of the sampling cylinder (22), the bottom end of the threaded rotating rod (21) is movably inserted into the butt joint sleeve (23), and the butt joint position of the threaded rotating rod (21) and the butt joint sleeve (23) is penetrated and connected with a pin (24).

6. The prairie carbon sink investigation sample collection apparatus of claim 5, wherein: The outer wall of the ring body of the sampling tooth ring (25) is a stepped surface with three upper-to-lower outer diameters gradually increasing, the uppermost stepped surface of the sampling tooth ring (25) is provided with friction stripes (28), the sleeved bottom ring (31) is sleeved on the uppermost stepped surface of the sampling tooth ring (25), the middle stepped surface of the sampling tooth ring (25) is provided with a threaded ring (29), the sampling cylinder (22) is threadedly butt jointed with the threaded ring (29) of the middle stepped surface, and the outer diameter of the sampling cylinder (22) is equal to the diameter of the lowermost stepped surface of the sampling tooth ring (25).

7. The prairie carbon sink investigation sample collection apparatus of claim 6, wherein: The cylinder wall of the sampling cylinder (22) is provided with a plurality of spiral guide grooves (210), the cylinder wall part of the sampling cylinder (22) and the sampling tooth ring (25) are threadedly connected with a locking screw (212), the locking screw (212) is arranged in one of the spiral guide grooves (210) in a concave manner, and the spiral guide grooves (210) are arranged in one-to-one correspondence with the forward cutting teeth (26).

8. The prairie carbon sink investigation sample collection apparatus of claim 7, wherein: The top end of the threaded rotating rod (21) is fixedly connected with a rotating handle (211).

9. The prairie carbon sink investigation sample collection apparatus of claim 1, wherein: The outer wall of the sleeve connecting bottom ring (31) is configured as two stepped surfaces with increasing diameters from top to bottom, the upper stepped surface of the sleeve connecting bottom ring (31) is symmetrically provided with a clamping through groove (34), the ring body of the sleeve connecting bottom ring (31) at the part provided with the clamping through groove (34) is sleeved with an annular elastic bandage (33), and the annular elastic bandage (33) and the sleeve connecting bottom ring (31) clasp the cylindrical collecting bag (32).

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