A soil pollution sampling device

Abstract

The utility model discloses a kind of soil pollution sampling device, it is related to soil sampling technical field, including sampling cylinder, the soil cavity of columnar is formed in it, the top area of the soil cavity is equipped with several multidirectional airflow passage;Elasticity cylinder, coaxial sleeve is set in the soil cavity, its bottom end and top outer edge are fixedly connected in the inner wall of soil cavity, unfixed wall constitutes half-suspended covering part and airflow passage export end opposite, form the dynamic gap adjustment area between covering part and the inner wall of soil cavity.The utility model passes through the gap wall folding extrusion of elasticity cylinder top wall and inner side wall by cross centripetal airflow field drive, by extrusion thrust directional effect in the residual soil in gap, the residual of gap dead angle that traditional device is difficult to handle can be targetedly removed, solve the problem that wet soil is retained solidification in gap due to viscosity, ensure that there is no hidden residual when sample soil is taken out, improve sampling integrity;The peristalsis effect of the utility model elasticity cylinder under the action of airflow.

Description

Technical Field

[0001] This utility model relates to the field of soil sampling technology, specifically a soil pollution sampling device. Background Technology

[0002] In soil pollution monitoring and remediation, accurate soil sample collection is fundamental for subsequent testing, analysis, and pollution assessment, directly impacting data reliability and the scientific validity of remediation plans. Sampling of moist soils (such as those in farmland, wetlands, and riparian zones) presents a significant challenge due to their high viscosity and tendency to adhere.

[0003] Existing soil pollution sampling devices mostly adopt rigid cylindrical structures. When taking out moist soil samples, the high moisture content of the soil can easily lead to stubborn residues on the inner wall and in the gaps of the structure. These residues not only cause soil loss and affect the integrity of the sampling, but also mix in new samples in subsequent sampling, causing cross-contamination and interfering with the accuracy of the test results. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a soil pollution sampling device.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A soil pollution sampling device, comprising:

[0007] The sampling tube has a columnar soil-containing cavity inside, and the top area of ​​the soil-containing cavity has several multi-directional airflow channels.

[0008] The elastic cylinder is coaxially sleeved in the soil placement cavity. Its bottom and top outer edges are fixed to the inner wall of the soil placement cavity. The unfixed wall forms a semi-suspended covering part that is directly opposite the outlet end of the airflow channel, forming a dynamic gap adjustment zone between the covering part and the inner wall of the soil placement cavity.

[0009] The negative pressure component is located inside the sampling cylinder. Its output end is connected to the airflow channel to form a cross-shaped centripetal airflow field, which causes the covering part to radially contract and deform, forcing the elastic cylinder gap wall of the dynamic gap adjustment zone to fold and squeeze.

[0010] Preferably, the airflow channel includes an axial flow channel and a "C"-shaped flow channel. The axial flow channel is connected to the "C"-shaped flow channel and the output end of the negative pressure component to transform the axial airflow of the negative pressure component into a cross-shaped airflow that acts on the covering part.

[0011] Preferably, the aperture of the axial flow channel is larger than that of the "C"-shaped flow channel, so that the gap line formed by the folding and extrusion between the elastic cylinder gap walls forms a 40°-60° angle with the inner sidewall of the sampling cylinder.

[0012] Preferably, the diameter of the inner tube of the elastic cylinder gradually decreases in the opposite direction to the axial flow channel, and the decrease in diameter is proportional to the radial shrinkage diameter.

[0013] Preferably, the inlet of the elastic cylinder with varying diameter has a conical flared structure, and its conical surface is set parallel to the inner wall of the soil placement cavity.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model uses a cross-shaped centripetal airflow field to drive the folding and compression of the gap between the top wall and the inner side wall of the elastic cylinder. The compression thrust acts directionally on the residual soil in the gap, which can specifically remove the dead corners of the gap that are difficult to handle by traditional devices. It solves the problem of moist soil being stuck and solidified in the gap due to its stickiness, ensuring that there are no hidden residues when the soil sample is taken out, and improving the integrity of the sampling.

[0016] 2. The peristaltic effect generated by the elastic cylinder of this utility model under the action of airflow breaks the static adhesion balance between the soil and the inner wall through periodic dynamic deformation from contraction to micro-expansion. It uses alternating force to peel off the inner wall adhesion layer in layers, which can improve the desorption rate and cover the entire inner wall surface, reduce soil residue in non-crack areas, and solve the sampling loss problem caused by inner wall adhesion in traditional devices. Attached Figure Description

[0017] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 For the present utility model Figure 2 Another schematic diagram of the state structure.

[0021] The diagram is labeled as follows: 1. Sampling cylinder; 11. Soil cavity; 12. Airflow channel; 121. Axial flow channel; 122. "C" shaped flow channel; 2. Elastic cylinder; 21. Covering part; 3. Negative pressure component. Detailed Implementation

[0022] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0023] Example

[0024] like Figures 1-3 As shown, a soil pollution sampling device includes:

[0025] The sampling tube 1 has a columnar soil placement cavity 11 inside, and the top area of ​​the soil placement cavity 11 has several multi-directional airflow channels 12.

[0026] The elastic cylinder 2 is coaxially sleeved in the soil placement cavity 11. Its bottom and top outer edges are fixed to the inner wall of the soil placement cavity 11. The unfixed wall forms a semi-suspended covering part 21 that is directly opposite to the outlet end of the airflow channel 12, forming a dynamic gap adjustment zone between the covering part 21 and the inner wall of the soil placement cavity 11.

[0027] The negative pressure component 3 is located inside the sampling cylinder 1. Its output end is connected to the airflow channel 12 to form a cross-shaped centripetal airflow field, causing the covering part 21 to radially contract and deform, forcing the elastic cylinder 2 in the dynamic gap adjustment zone to fold and squeeze between the gap walls.

[0028] In the negative pressure component 3, the piston slides in the negative pressure chamber opened inside the sampling tube 1. The piston is connected to the cylinder and pushed to slide, so that the gas is discharged to the covering part 21 through the air flow channel 12. The negative pressure component 3 can also use a vacuum pump or other components or linkage mechanisms that can drive the covering part 21 to deform.

[0029] Moist soil, due to its strong viscosity, tends to remain on the inner wall of the sampling device, affecting the accuracy of subsequent sampling. When the moist soil sample is removed, the negative pressure component 3 is activated, and the cross-shaped centripetal airflow impacts the contraction of the covering part 21, causing the gap wall between the top wall and the inner side wall of the elastic cylinder 2 to fold and compress, forming a compressive thrust on the residual soil, forcibly displacing the residual soil, and forming a directional thrust acting on the residual soil in the gap, reducing the retention of moist soil in the gap of the elastic cylinder 2. The concentrated thrust generated by folding and compression directly acts on the residual soil in the gap, which can specifically remove the gap dead corners that are difficult to reach by traditional sampling devices, avoid soil accumulation and solidification in the gap, and reduce the risk of residue from the source.

[0030] The contraction deformation of the elastic cylinder 2 under airflow impact is not static, but rather accompanied by the release of elastic potential energy of the elastic material, forming a periodic dynamic deformation of contraction-micro-expansion-re-contraction. Similar to the continuous dynamic force of biological peristalsis, this force acts on the soil adhering to the inner wall, disrupting the adhesion balance. The adhesion between the moist soil and the inner wall of the elastic cylinder 2 depends on static contact pressure. The dynamic alternating force generated by peristalsis continuously disrupts this balance, causing the contact points between soil particles and the inner wall to continuously break, significantly reducing adhesion strength and promoting the shedding of surface soil. The continuous dynamic disturbance created by the peristaltic effect can transmit force to the adhering soil at different depths more quickly than static compression, especially having a layered peeling effect on the adhering layer formed on the inner wall, allowing the desorption process to progress from the surface to the deeper layers, shortening the soil shedding time. The elastic deformation of the elastic cylinder 2 is global; the peristaltic effect can cover the entire inner wall surface, including the adhering soil in non-cracked areas, overcoming the limitation of folding compression which only targets cracks. This achieves comprehensive removal of residues from the inner wall, further improving the integrity of the sample soil extraction.

[0031] like Figure 3 As shown, the airflow channel 12 includes an axial flow channel 121 and a "C"-shaped flow channel 122. The axial flow channel 121 is connected to the "C"-shaped flow channel 122 and the output end of the negative pressure component 3, transforming the axial airflow of the negative pressure component 3 into a cross-shaped airflow that acts on the covering part 21. The aperture of the axial flow channel 121 is larger than the aperture of the "C"-shaped flow channel 122, so that the gap line formed by the folding and compression between the gap walls of the elastic cylinder 2 forms a 40°-60° angle with the inner wall of the sampling cylinder 1. The angle design between the gap line formed by the folding and compression and the inner wall of the sampling cylinder 1 makes the compression thrust point obliquely towards the outlet direction, using the principle of mechanical force component to force the soil to be guided to the outlet, avoiding soil rebound and retention caused by vertical compression, and improving soil discharge efficiency.

[0032] like Figure 3 As shown, the inner diameter of the elastic cylinder 2 gradually decreases in the opposite direction to the axial flow channel 121, and the decreasing ratio is proportional to the radial shrinkage diameter. The decrease in pipe diameter is synchronized with the radial shrinkage, forming a progressively tightening axial thrust, so that the soil is subjected to uniform force in the axial direction, avoiding residual differences caused by excessive local compression or insufficient thrust.

[0033] like Figure 3 As shown, the inlet of the elastic cylinder 2 with its varying inner diameter has a conical flared structure, with its conical surface parallel to the inner wall of the soil placement cavity 11. The conical flared structure of the elastic cylinder 2 inlet serves two purposes: firstly, it reduces resistance when soil enters, facilitating smooth soil filling during sampling; secondly, the design of the conical surface being parallel to the inner wall avoids step-like obstruction at the inlet, preventing soil accumulation or jamming and improving the smoothness of the sampling operation.

[0034] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A soil pollution sampling device, characterized by, include: The sampling tube (1) forms a columnar soil placement cavity (11) inside, and the top area of ​​the soil placement cavity (11) is provided with several multi-directional airflow channels (12). The elastic cylinder (2) is coaxially sleeved in the soil placement cavity (11). Its bottom end and top edge are fixed to the inner wall of the soil placement cavity (11). The unfixed wall forms a semi-suspended covering part (21) which is directly opposite to the outlet end of the airflow channel (12), forming a dynamic gap adjustment zone between the covering part (21) and the inner wall of the soil placement cavity (11). The negative pressure component (3) is located inside the sampling tube (1). Its output end is connected to the airflow channel (12) to form a cross-shaped centripetal airflow field, causing the covering part (21) to radially shrink and deform, forcing the elastic tube (2) of the dynamic gap adjustment zone to fold and squeeze between the gap walls.

2. The soil pollution sampling device of claim 1, wherein: The airflow channel (12) includes an axial flow channel (121) and a "C"-shaped flow channel (122). The axial flow channel (121) is connected to the "C"-shaped flow channel (122) and the output end of the negative pressure component (3) to transform the axial airflow of the negative pressure component (3) into a cross-shaped airflow that acts on the covering part (21).

3. The soil pollution sampling device according to claim 2, characterized in that: The aperture of the axial flow channel (121) is larger than that of the "C"-shaped flow channel (122), so that the gap line formed by the folding and extrusion between the gap walls of the elastic cylinder (2) forms an angle of 40°-60° with the inner wall of the sampling cylinder (1).

4. A soil pollution sampling device according to claim 3, characterized in that: The inner diameter of the elastic cylinder (2) gradually decreases in the opposite direction to the axial flow channel (121), and the decrease in diameter is proportional to the radial shrinkage diameter.

5. A soil pollution sampling device according to claim 4, characterized in that: The inlet of the elastic cylinder (2) with varying inner diameter has a conical flared structure, and its conical surface is set parallel to the inner wall of the soil placement cavity (11).

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