Double-pipe progressive soil sampler

Abstract

The utility model provides a double-pipe progressive soil sampler, which is characterized in that an outer barrel is of a barrel-shaped structure with a closed top end, an outer barrel drill bit mounted at the bottom end and a plurality of through holes uniformly distributed on the side wall, and a handle is mounted at the top end of the outer barrel; the inner cylinder is of a cylindrical structure with the top end closed and the bottom end provided with an inner cylinder drill bit, and the top of the inner cylinder is installed at the inner top end of the outer cylinder. The cutting elastic piece assembly comprises a top pull rod, a movable sleeve and a stainless steel elastic piece at the bottom end, the movable sleeve can be movably arranged in an interlayer space between the outer barrel and the inner barrel in a sleeving mode in the axial direction, and the top pull rod penetrates through the top end of the outer barrel and is connected with the movable sleeve; the stainless steel elastic pieces are installed at the bottom end of the movable sleeve in a surrounding mode, and in the closed state, the stainless steel elastic pieces are closed to form a closed drill bit structure with the bottom end being a sharp corner. In the stretching state, the stainless steel elastic pieces move upwards along with the movable sleeve and deform and are opened under the constraint of the inner barrel drill bit. The double-pipe progressive soil sampler can complete drilling and soil sampling operation at a time, the soil sampling purity is high, and the original state is kept well.

Description

Technical Field

[0001] This utility model relates to the field of soil sampler technology, specifically to a dual-tube progressive soil sampler. Background Technology

[0002] Soil samples are required during soil environmental monitoring and geological monitoring, making soil samplers one of the most frequently used basic tools.

[0003] In field teaching, it is sometimes necessary to collect undisturbed soil samplers that are highly sensitive to undisturbed soil and maintain a good internal soil structure. These samplers are usually in the form of a double-tube combination. The outer tube is mainly used to cut the soil and drill to a specific depth, while the inner tube is used to collect samples at a specific depth.

[0004] For current dual-tube or multi-tube soil samplers, the operation process is mostly to first drill holes, and then lower the soil sampler based on the drilled holes to take soil from below. For example, the patent with application number 202221324151.9 and invention title: "A dual-tube single-acting valve type soil sampler" belongs to this type of operation.

[0005] This equipment performs relatively well in general soil extraction environments, but when encountering highly sensitive soils such as sandy soil and silt with high moisture content, it is difficult to retain moisture during the soil extraction process, and the moisture will be lost, resulting in poor preservation of the original soil.

[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a dual-tube progressive soil sampler that can better preserve the internal structure of undisturbed soil, especially highly sensitive soils such as sandy soil and silt with high water content.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a dual-tube progressive soil sampler, comprising an outer cylinder, an inner cylinder, and a cutting spring assembly;

[0009] The outer cylinder is a cylindrical structure with a closed top, an outer cylinder drill bit installed at the bottom, and several through holes evenly distributed on the side wall. A handle is installed at the top of the outer cylinder.

[0010] The inner cylinder is a cylindrical structure with a closed top and an inner cylinder drill bit installed at the bottom. The top of the inner cylinder is installed inside the top of the outer cylinder.

[0011] The cutting spring assembly includes a top pull rod, a movable sleeve, and a stainless steel spring at the bottom. The movable sleeve is axially movable and is fitted in the interlayer space between the outer cylinder and the inner cylinder. The top pull rod passes through the top of the outer cylinder and is connected to the movable sleeve.

[0012] The stainless steel spring sheets are installed at the bottom of the movable sleeve. In the closed state, the stainless steel spring sheets are closed together to form a closed drill bit structure with a pointed bottom. In the stretched state, the stainless steel spring sheets move upward with the movable sleeve and deform and open under the constraint of the inner cylinder drill bit.

[0013] Based on the above, a ring is provided at the center of the top pull rod portion, and the ring of the top pull rod is fitted with the handle connecting rod at the top of the outer cylinder.

[0014] Based on the above, the ring of the top pull rod is in sliding or threaded engagement with the handle connecting rod.

[0015] Based on the above, the outer cylinder body is either an integral structure or a segmented assembly structure.

[0016] Based on the above, the inner cylinder body is either an integral structure or a segmented assembly structure.

[0017] Based on the above, the top end of the inner cylinder is mounted on the inner top end of the outer cylinder via a connector and a thrust bearing.

[0018] Based on the above, the stainless steel spring includes a vertical edge and a beveled edge. The vertical edge is used to fix it to the movable sleeve, and the beveled edge is used to tilt towards the center. The beveled edges of multiple stainless steel springs are gathered together to form the drill bit structure.

[0019] Based on the above, the number of stainless steel springs is at least four.

[0020] This utility model has substantial features and progress compared to the prior art. Specifically, the double-tube progressive soil sampler designed in this utility model controls the bottom end of the cutting spring assembly to stretch into the double-tube gap during the drilling process without affecting the drilling process. The soil is cut and left inside the inner tube. After reaching the set depth, the bottom end of the cutting spring assembly is controlled to close, locking highly sensitive soils such as sandy soil and silt with high water content in a closed space, minimizing water loss and maintaining the original state of the soil.

[0021] The entire soil extraction process is divided into two steps: the first step is the drilling and soil extraction process, and the second step is the water-locking process. Hence, it is called a progressive soil extractor. The entire soil extraction process reduces water seepage and discharge, and avoids the mixing of extra soil, thus ensuring the purity of the extracted soil. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the double-tube progressive soil sampler in this utility model.

[0023] Figure 2 This is a magnified view of part A in this utility model.

[0024] Figure 3 This is a magnified view of part B in this utility model.

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the stainless steel spring sheet in this utility model.

[0026] In the diagram: 1. Outer cylinder; 2. Inner cylinder; 3. Cutting spring assembly; 4. Handle; 11. Outer cylinder drill bit; 12. Through hole; 21. Inner cylinder drill bit; 22. Connector; 23. Thrust bearing; 31. Top tie rod; 32. Movable sleeve; 33. Stainless steel spring; 34. Ring. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0028] like Figures 1-4 As shown, a dual-tube progressive soil sampler includes an outer cylinder 1, an inner cylinder 2, and a cutting spring assembly 3.

[0029] First, it should be noted that since the teaching experiment is mainly used to introduce the characteristics of soil and some key points of related tools and soil sampling operations, it is mostly used for shallow soil sampling. The length of the entire soil sampler is no more than 1.5 meters, mostly around 1.2 meters. Therefore, the soil layer sampled is relatively shallow and the soil is relatively loose, which can be completed manually. Moreover, since the soil layer sampled is relatively shallow, this scheme is mainly used to solve how to better maintain the internal structure of highly sensitive soils such as sandy soil and silt with high water content.

[0030] The outer cylinder 1 is a cylindrical structure with a closed top, an outer cylinder drill bit 11 installed at the bottom, and several through holes 12 evenly distributed on the side wall. A handle 4 is installed at the top of the outer cylinder. The outer cylinder drill bit 11 is a drilling drill bit with a certain drilling angle. The through holes 12 are mainly used to discharge the soil that enters the interlayer between the outer cylinder and the inner cylinder during the drilling process to avoid jamming. The handle 4 is a force-applying structure for hand gripping.

[0031] In this embodiment, the outer cylinder is made of a single cylindrical tube, with a sealing plate welded to the top.

[0032] The inner cylinder 2 is a cylindrical structure with a closed top and an inner cylinder drill bit 21 installed at the bottom. The top of the inner cylinder 2 is installed inside the top of the outer cylinder. In this embodiment, to avoid the structure from being easily jammed, the top of the inner cylinder 2 is installed on the inner top of the outer cylinder 1 through a connector 22 and a thrust bearing 23. Its function is that when the inner cylinder needs to withstand higher pressure from the soil during secondary advancement, the thrust bearing 23 can withstand higher radial pressure, so the inner cylinder is installed by means of the thrust bearing 23.

[0033] The cutting spring assembly 3 includes a top pull rod 31, a movable sleeve 32, and a stainless steel spring 33 at the bottom. The movable sleeve 32 is axially movable and sleeved in the interlayer space between the outer cylinder 1 and the inner cylinder 2. The top pull rod 31 passes through the top of the outer cylinder and is connected to the movable sleeve 32.

[0034] The stainless steel spring pieces 33 are installed around the bottom end of the movable sleeve. In the closed state, the stainless steel spring pieces 33 are closed together to form a closed drill bit structure with a pointed bottom. In the stretched state, the stainless steel spring pieces 33 move upward with the movable sleeve 32 and deform and open under the constraint of the inner cylinder drill bit 21.

[0035] The stainless steel spring 33 includes a vertical edge and a beveled edge. The vertical edge is used to fix it to the movable sleeve 32, and the beveled edge is used to tilt towards the center. The beveled edges of multiple stainless steel springs 33 are gathered together to form the drill bit structure. The number of stainless steel springs is at least four, and five are provided in this embodiment.

[0036] For ease of operation, a ring 34 is provided at the center of the top pull rod 31. The ring 34 of the top pull rod is fitted with the handle connecting rod at the top of the outer cylinder. The ring of the top pull rod and the handle connecting rod are slidably engaged or threadedly engaged.

[0037] The work process is as follows:

[0038] First, adjust the state of the cutting spring assembly 3 to the stretched state to ensure that the bevels of the five stainless steel springs 33 are gathered into the gap between the two tubes, fully exposing the inner cylinder drill bit 21. Then, when the drilling site is determined, drilling begins.

[0039] The drilling process is mainly operated manually by manipulating the handle 4 at the top, which continuously feeds the soil sampler forward by twisting it left and right.

[0040] During the drilling process, most of the soil at the target location enters the interior of the inner cylinder 2, forming columnar soil. A small amount of soil enters the interlayer of the outer cylinder 1 and is turned outward from the through hole 12 of the outer cylinder 1, thus avoiding the accumulation of soil inside the soil sampler. During this process, the stainless steel spring 33 does not play a role.

[0041] Of course, since the gap between the outer cylinder 1 and the external soil is small, the amount of soil that can be discharged is relatively limited. Therefore, this soil sampler is only suitable for taking relatively shallow soil, and its diameter should not be too large to avoid the soil from being blocked due to having nowhere to be discharged.

[0042] After entering the soil layer at the set depth, the soil sampler is twisted to loosen the soil at the target depth. The top lever 31 is then pushed forward, and the stainless steel spring 33 below is pushed out of the interlayer and cuts the soil before closing together. Finally, the stainless steel springs close together to form a closed space, sealing the soil with high water content inside. Then the soil sampler is taken out. Because the closed structure loses less water, it better reflects the soil morphology. The soil layers taken out retain their original shape, which is more in line with the original underground morphology.

[0043] In other scenarios with harder soil, drilling can be difficult. It is advisable to drill to a depth close to the target depth first, and then use the soil sampler to extract soil, which can also yield better soil samples.

[0044] However, overall, this solution is particularly suitable for use in soil environments where the soil is relatively loose and difficult to maintain its original state.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A dual tube progressive soil sampler characterized by: The drill comprises an outer tube, an inner tube and a cutting spring assembly; The outer tube is a cylindrical structure with a closed top end, a bottom end mounted with a drill bit, and a plurality of through holes evenly distributed on the side wall. The inner tube is a cylindrical structure with a closed top end and a bottom end mounted with an inner tube drill bit. The cutting spring assembly comprises a top pull rod, a movable sleeve and a bottom end stainless steel spring. The movable sleeve is movably sleeved in the interlayer space between the outer tube and the inner tube.

2. The dual tube progressive soil sampler of claim 1, wherein: The stainless steel spring is mounted at the bottom end of the movable sleeve.

3. The dual tube progressive soil sampler of claim 2, wherein: In the closed state, the stainless steel spring is folded to form a closed drill bit structure with a sharp bottom end.

4. A dual tube progressive soil sampler according to claim 1 or 2 or 3 wherein: In the stretched state, the stainless steel spring is deformed and opened under the constraint of the inner tube drill bit.

5. The dual tube progressive soil sampler of claim 1 or 2 or 3, wherein: The top pull rod is provided with a ring at the center of the pull rod part.

6. The dual tube progressive soil sampler of claim 1 or 2 or 3, wherein: The ring of the top pull rod is sleeved with the handle connecting rod of the outer tube.

7. The dual tube progressive soil sampler of claims 1 or 2 or 3, wherein: The ring of the top pull rod is in sliding or threaded connection with the handle connecting rod.

8. The dual tube progressive soil sampler of claim 7, wherein: The outer tube is an integral structure or a segmented assembly structure. The inner tube is an integral structure or a segmented assembly structure. The top end of the inner tube is mounted on the inner top end of the outer tube through a connecting piece and a thrust bearing. The stainless steel spring comprises a vertical edge and an inclined edge. The vertical edge is used to fix to the movable sleeve. The inclined edge is used to incline to the center. The inclined edges of a plurality of stainless steel springs are folded to form the drill bit structure. The number of stainless steel springs is at least four.

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