Cross contamination prevention staggered soil sampling device

Abstract

The utility model discloses a kind of cross-contamination prevention staggered layer soil sampling devices, including several sampling tubes, several sampling tubes combination form sampling barrel, connecting structure for being connected with adjacent sampling tube is provided on each sampling tube, the bottom of the sampling tube at the lowermost of sampling tube is connected with drill bit, the top of the sampling tube at the uppermost of sampling tube is detachably connected with hand wheel, each sampling tube outer peripheral wall is protruding with the flow guide boss for when sampling tube rotates, pushes the periphery soil movement, each sampling tube is hollow and is provided with cavity, flow guide boss side wall is contact surface, contact surface is provided with the inlet slot for with cavity communication to be filled with soil cavity, sampling barrel is detachably connected with the sealing plate for before sampling barrel is placed into external soil, several inlet slots are closed, the utility model solves the problem that traditional soil sampling device is difficult to portable carry, lack staggered layer soil synchronous collection structure and when staggered layer soil sampling, easily lead to soil sample cross-contamination.

Description

Technical Field

[0001] This utility model relates to the field of soil sampling equipment technology, specifically a cross-contamination-preventing staggered soil sampling device. Background Technology

[0002] Soil sampling technology is widely used in environmental monitoring, agricultural production, and geological surveys. Existing sampling devices are mainly divided into three categories: manual insertion type, auger drilling type, and hydraulically driven type. Among them, the manual insertion type has become a commonly used device for field operations due to its ease of operation and low cost. Traditional manual sampling devices mostly consist of a single sampling tube, which is manually inserted and pulled to collect soil samples. They are suitable for obtaining surface soil or samples from a single depth.

[0003] However, existing technologies have significant limitations: First, the monolithic structure makes transportation and carrying inconvenient, especially in complex terrains such as mountains and forests where flexibility is poor; second, the lack of staggered synchronous sampling function requires multiple samplings to obtain soil profile data, which can easily damage the soil structure at the sampling points; third, the risk of cross-contamination during sampling is high, as the open inlet design allows soil from different layers to mix easily through the gaps in the tube walls, affecting the accuracy of the test data; and fourth, the connection stability of some segmented devices is insufficient, and components are prone to loosening when screwed into the soil, further aggravating sampling errors. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a cross-contamination-preventing staggered soil sampling device, which solves the problems of traditional soil sampling devices being difficult to carry, lacking a structure for simultaneous collection of staggered soil samples, and being prone to cross-contamination of soil samples during staggered soil sampling.

[0005] To achieve the above objectives, this utility model provides a cross-contamination prevention and layered soil sampling device, comprising several sampling tubes, which are coaxially stacked in a cylindrical arrangement and combined to form a sampling cylinder. Each sampling tube is provided with a connection structure for detachable connection with adjacent sampling tubes. A drill bit is detachably connected to the bottom of the lowest sampling tube, and a handwheel for external operation is detachably connected to the top of the highest sampling tube. Each sampling tube has a protruding guide protrusion on its outer peripheral wall for moving the surrounding soil when the sampling tube is rotated. Each sampling tube is hollow and has a cavity for accommodating soil. The side wall of the guide protrusion is a contact surface for contacting the surrounding soil. The contact surface is perpendicular to the outer peripheral wall of the sampling tube and has a sampling groove for communicating with the cavity to allow soil to be poured into the cavity. A sealing plate is detachably connected to the sampling cylinder for sealing several sampling grooves before the sampling cylinder is placed into the external soil.

[0006] The advantages of adopting the above technical solution are: the above technology forms a sampling cylinder by coaxially stacking several sampling tubes, and with the detachable connection structure, it realizes the modular assembly of the device, which is convenient for transportation and carrying, and the length can be flexibly adjusted according to the sampling depth; furthermore, through the vertical contact surface of the guide protrusion and the design of the injection groove, the surrounding soil is pushed into the cavity when the sampling tube rotates, realizing the synchronous collection of soil layers; and the sealing plate closes the injection groove before sampling, effectively avoiding cross-contamination of soil layers during the insertion process, improving the purity of the sample, and after sampling, the sealed injection groove can be inserted to prevent soil sample overflow from causing cross-contamination or leakage.

[0007] This utility model further includes the following: the connecting structure includes a connecting shaft at the top of the sampling tube and a connecting hole on the bottom wall of the sampling tube. The connecting hole on each sampling tube is inserted into the connecting shaft on the adjacent sampling tube. A first through hole is connected to the corresponding connecting hole on the outer peripheral wall of the sampling tube. A second through hole is provided on the connecting shaft. The connecting structure also includes a connecting bolt. When the first through hole and the second through hole are coaxially aligned, the connecting bolt is threadedly connected to the first through hole and the second through hole respectively. The cavity is connected to the top wall of the sampling tube to form an outlet for the soil sample in the cavity to be discharged from the cavity. A cap is provided at the top of each sampling tube. The cap is placed on the top wall of the sampling tube and closes the outlet. Several disassembly bolts are detachably connected between the cap and the sampling tube.

[0008] The advantages of adopting the above technical solution are: the insertion structure of the connecting shaft and the connecting hole, combined with the connecting bolts, enables quick disassembly and assembly and stable connection between the sampling tubes, ensuring no relative rotation when the sampling tube is screwed into the soil; the design of the discharge port and the cap facilitates the quick removal of soil samples after sampling, and the bolts for fixing the cap prevent sample leakage during the sampling process, improving the convenience of operation and the integrity of the samples.

[0009] The present invention further includes: a linkage shaft on the handwheel, a first linkage hole at the end of the linkage shaft for inserting the connecting shaft of the adjacent sampling tube, and a connecting pin threaded on the outer peripheral wall of the linkage shaft for threaded engagement with the second through hole on the adjacent connecting shaft through the first linkage hole.

[0010] The advantages of adopting the above technical solution are: the insertion structure of the first linkage hole at the end of the linkage shaft and the connecting shaft of the sampling tube, together with the connecting pin, realizes the detachable transmission connection between the handwheel and the sampling tube, ensuring that the torque is effectively transmitted to the sampling tube when the operator turns the handwheel, thereby improving the operational stability and transmission efficiency of the device.

[0011] The present invention further comprises: a swing head at the bottom of the handwheel, a linkage block at the beginning of the linkage shaft, a swing groove on the bottom wall of the linkage block, the swing head being movably disposed in the swing groove, a first through hole on the side wall of the linkage block, a second through hole through the swing head, the first through hole and the second through hole being coaxially aligned and a positioning pin being inserted between the first through hole and the second through hole, a first toothed groove being circumferentially formed on the outer peripheral wall of the positioning pin, and a second toothed groove being circumferentially formed on the inner peripheral walls of the first through hole and the second through hole, the first toothed groove engaging with the two second toothed grooves respectively.

[0012] The advantages of adopting the above technical solution are: the movable setting of the swing head in the swing groove and the toothed meshing structure of the positioning pin in the above technology realize the angle adjustment and fixation between the handwheel and the linkage shaft. The operator can flexibly adjust the direction of the handwheel according to the working space, such as to collect soil samples from the slope of a hillside. By adjusting the relative tilt angle between the handwheel and the sampling tube according to different insertion angle requirements, the operator can adapt to the working requirements, thereby improving practicality and applicability. Furthermore, the toothed meshing of the first and second toothed grooves ensures the relative fixation of the swing head and the swing groove, thereby ensuring that there is no slippage in the transmission process and improving the adaptability and operating accuracy in complex terrain.

[0013] The present invention further includes: a fixed shaft at the top of the drill bit for fitting into the connection hole of an adjacent sampling tube; a second linkage hole for threaded engagement with an adjacent connecting bolt on the fixed shaft; and several guide impellers evenly distributed circumferentially on the outer peripheral wall of the drill bit, wherein the radial cross-section of the guide impellers is arc-shaped and the arc direction of the several guide impellers is consistent.

[0014] The advantages of adopting the above technical solution are: the insertion of the fixed shaft and the connecting hole and the bolt fixing of the second linkage hole in the above technology realize the stable connection between the drill bit and the sampling tube, and prevent the drill bit from falling off during the drilling process; while the circumferentially distributed arc-shaped guide impeller generates guiding thrust on the surrounding soil when the sampling tube rotates, reducing drilling resistance and reducing soil structure damage, thereby improving sampling efficiency and sample representativeness.

[0015] The present invention is further provided that the sealing plate and the flow guide protrusion are magnetically coupled to achieve the adhesion or separation of the sealing plate and the contact surface.

[0016] The advantages of adopting the above technical solution are: the magnetic attraction between the sealing plate and the guide protrusion enables the rapid sealing and opening of the sample inlet. Before sampling, the sealing plate is tightly attached to the contact surface to prevent soil from entering. During sampling, the sealing plate can be easily separated by external force to collect soil. The operation is convenient and the sealing performance is reliable, further ensuring the purity of the sample from the staggered sampling. Attached Figure Description

[0017] Figure 1This is a three-dimensional view of the present invention from a forward perspective;

[0018] Figure 2 for Figure 1 A 3D view after removing the cover plate;

[0019] Figure 3 This is a three-dimensional view of the present invention from a reverse perspective;

[0020] Figure 4 This is a cross-sectional view of the present invention;

[0021] Figure 5 This is a three-dimensional view of the sampling tube in this utility model;

[0022] Figure 6 This is a three-dimensional view of the handwheel and linkage shaft in the present invention in a separated state. Detailed Implementation

[0023] This utility model provides a cross-contamination prevention and layered soil sampling device, including several sampling tubes 1. These sampling tubes 1 are coaxially stacked in a cylindrical shape, and the tubes are combined to form a sampling cylinder. Each sampling tube 1 has a connection structure for detachable connection with adjacent sampling tubes 1. A drill bit 2 is detachably connected to the bottom of the lowest sampling tube 1, and a handwheel 3 for external operation is detachably connected to the top of the highest sampling tube 1. Each sampling tube 1 has a protruding guide protrusion 4 on its outer peripheral wall for moving surrounding soil when the tube 1 rotates. Each sampling tube 1 has a hollow cavity 11 for accommodating soil. The sidewall of the guide protrusion 4 is designed for... The sampling tube 1 has a contact surface 41 that contacts the surrounding soil. This contact surface 41 is perpendicular to the outer wall of the sampling tube 1, and a sample inlet 42 is provided on the contact surface 41 for communicating with the cavity 11 to allow soil to be poured into the cavity 11. A sealing plate 5 is detachably connected to the sampling tube to seal several sample inlet 42s before the sampling tube is placed into the external soil. The connection structure includes a connecting shaft 12 located at the top of the sampling tube 1 and a connecting hole 13 on the bottom wall of the sampling tube 1. Each connecting hole 13 on the sampling tube 1 is inserted into the connecting shaft 12 on the adjacent sampling tube 1. A first through hole 14 on the outer wall of the sampling tube 1 corresponds to the position of the connecting hole 13 and communicates with it. A second through hole 121 is provided on the connecting shaft 12. The structure also includes connecting bolts 15. When the first through hole 14 and the second through hole 121 are coaxially aligned, the connecting bolts 15 are threadedly connected to the first through hole 14 and the second through hole 121 respectively. The cavity 11 is connected to the top wall of the sampling tube 1 to form an outlet 111 for the soil sample in the cavity 11 to be discharged from the cavity 11. Each sampling tube 1 is provided with a cap 16 at the top. The cap 16 covers the top wall of the sampling tube 1 and closes the outlet 111. The cap 16 and the sampling tube 1 are detachably connected by several disassembly bolts 161. The handwheel 3 is provided with a linkage shaft 31. The end of the linkage shaft 31 is provided with a first linkage hole 311 for the connecting shaft 12 of the adjacent sampling tube 1 to be inserted. A connecting pin is threaded onto the outer peripheral wall of the movable shaft 31 for threaded engagement with the second through hole 121 on the adjacent connecting shaft 12 through the first linkage hole 311. A swing head 313 is provided on the bottom of the handwheel 3. A linkage block 32 is provided at the beginning of the linkage shaft 31. A swing groove 321 is formed on the bottom wall of the linkage block 32. The swing head 313 is movably disposed in the swing groove 321. A first through hole 322 is formed on the side wall of the linkage block 32. A second through hole 314 passes through the swing head 313. The first through hole 322 and the second through hole 314 are coaxially aligned, and a positioning pin 33 is inserted between them. A first toothed groove 331 is formed circumferentially on the outer peripheral wall of the positioning pin 33.The inner peripheral walls of the first perforation 322 and the second perforation 314 are both circumferentially provided with second toothed grooves 323. The first toothed groove 331 is respectively engaged with the two second toothed grooves 323. The top of the drill bit 2 is provided with a fixed shaft 21 for insertion into the connecting hole 13 of the adjacent sampling tube 1. The fixed shaft 21 is provided with a second linkage hole 22 for threaded engagement with the adjacent connecting bolt 15. Several guide impellers 23 are evenly distributed circumferentially on the outer peripheral wall of the drill bit 2. The radial cross-section of the guide impellers 23 is arc-shaped and the arc direction of the several guide impellers 23 is consistent. The sealing plate 5 and the guide protrusion 4 are magnetically engaged to achieve the contact or separation of the sealing plate 5 and the contact surface 41.

[0024] Specific operating procedure: The operator selects several sampling tubes according to the required sampling depth, and forms a sampling cylinder by inserting the connecting shaft into the connecting hole and fixing it with connecting bolts; the fixed shaft of the drill bit is matched with the connecting hole of the bottom sampling tube and fixed with connecting bolts; when installing the handwheel, the first linkage hole of the linkage shaft is matched with the connecting shaft of the top sampling tube, and the transmission connection is realized by the connecting pin.

[0025] Before sampling, the sampling slot is sealed by the magnetic attraction of the sealing plate and the guide protrusion. The sampling tube is placed vertically at the sampling point, and the handwheel is turned to rotate the sampling tube. The resistance is reduced by the arc-shaped guide impeller of the drill bit, allowing the sampling tube to penetrate to the target depth. After reaching the depth, the operator pulls out the sealing plate, which separates the sealing plate from the sampling tube, thus exposing several sampling slots. Then the operator continues to rotate the sampling tube, so that the vertical contact surface of the guide protrusion pushes the surrounding soil through the sampling slot into the cavity of each sampling tube, realizing staggered synchronous sampling.

[0026] After sampling is completed, the operator first reinserts the sealing plate to close several sample inlet slots to prevent soil samples from overflowing. Then, the operator rotates the handwheel in the opposite direction to remove the sampling tube, removes the cap, and takes out soil samples from different depths through the outlet to effectively avoid cross-contamination.

[0027] In the above technology, the swing head structure of the handwheel and linkage shaft can flexibly adjust the operating angle, improve the adaptability to complex terrain, and the bolt-fixed connection structure ensures that the components do not loosen during the sampling process, thus guaranteeing sampling accuracy and sample integrity.

[0028] The above-mentioned technology allows operators to carry a large number of sampling tubes and assemble them independently based on soil sampling depth to improve sampling efficiency and accuracy. Furthermore, the caps can be left closed after sampling, allowing for later analysis of the soil samples, thus enhancing the accuracy and efficiency of subsequent analysis. This technology also improves the practicality and applicability of the device. Compared to pneumatic or hydraulically driven sampling devices, this device is inexpensive, portable, and easy to assemble, facilitating sampling in remote mountainous or forested areas, thereby increasing convenience.

[0029] The sampling tubes shown in the accompanying drawings of the above instruction manual are for illustrative purposes only and their size, shape, and quantity are not limited. Operators can assemble them independently to meet sampling needs. To ensure stability during actual insertion into the soil and rotation, the material of the sampling tube can be limited, i.e., the sampling tubes are made of hard materials (such as lightweight stainless steel) to prevent the sampling tubes from breaking during use. To ensure the connection strength between adjacent sampling tubes, the material of the connecting bolts can be limited, i.e., alloy steel bolts made of alloy steel are selected according to the actual operating conditions to adapt to high torque scenarios.

[0030] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A cross-contamination prevention staggered soil sampling device, characterized in that: The device includes several sampling tubes, which are coaxially stacked in a cylindrical shape and combined to form a sampling cylinder. Each sampling tube has a connection structure for detachable connection with adjacent sampling tubes. A drill bit is detachably connected to the bottom of the lowest sampling tube, and a handwheel for external operation is detachably connected to the top of the highest sampling tube. Each sampling tube has a protruding guide protrusion on its outer peripheral wall to move the surrounding soil when the sampling tube is rotated. Each sampling tube is hollow and has a cavity for accommodating soil. The side wall of the guide protrusion is a contact surface for contacting the surrounding soil. The contact surface is perpendicular to the outer peripheral wall of the sampling tube and has a sampling groove for communicating with the cavity to allow soil to be poured into the cavity. A sealing plate is detachably connected to the sampling cylinder to close several sampling grooves before the sampling cylinder is placed in the external soil.

2. The cross-contamination prevention staggered soil sampling device according to claim 1, characterized in that: The connection structure includes a connecting shaft at the top of the sampling tube and a connecting hole on the bottom wall of the sampling tube. The connecting hole on each sampling tube is inserted into the connecting shaft on the adjacent sampling tube. A first through hole is connected to the corresponding connecting hole on the outer peripheral wall of the sampling tube. A second through hole is provided on the connecting shaft. The connection structure also includes a connecting bolt. When the first through hole and the second through hole are coaxially aligned, the connecting bolt is threaded to the first through hole and the second through hole respectively. The cavity is connected to the top wall of the sampling tube to form an outlet for the soil sample in the cavity to be discharged from the cavity. A cap is provided at the top of each sampling tube. The cap is placed on the top wall of the sampling tube and closes the outlet. Several disassembly bolts are detachably connected between the cap and the sampling tube.

3. The cross-contamination prevention staggered soil sampling device according to claim 2, characterized in that: The handwheel is provided with a linkage shaft, and the end of the linkage shaft is provided with a first linkage hole for the insertion of the connecting shaft of the adjacent sampling tube. The outer peripheral wall of the linkage shaft is threaded with a connecting pin for threading through the first linkage hole and engaging with the second through hole on the adjacent connecting shaft.

4. The cross-contamination prevention staggered soil sampling device according to claim 3, characterized in that: The handwheel is provided with a swing head at its bottom, and a linkage block is provided at the beginning of the linkage shaft. The bottom wall of the linkage block is provided with a swing groove, and the swing head is movably disposed in the swing groove. A first through hole is provided on the side wall of the linkage block, and a second through hole is provided through the swing head. The first through hole and the second through hole are coaxially aligned and a positioning pin is inserted between the first through hole and the second through hole. A first toothed groove is provided circumferentially on the outer peripheral wall of the positioning pin, and a second toothed groove is provided circumferentially on the inner peripheral wall of the first through hole and the inner peripheral wall of the second through hole. The first toothed groove is engaged with the two second toothed grooves respectively.

5. The cross-contamination prevention staggered soil sampling device according to claim 2, characterized in that: The top of the drill bit is provided with a fixed shaft for fitting into the connection hole of the adjacent sampling tube. The fixed shaft is provided with a second linkage hole for threaded engagement with the adjacent connecting bolt. Several guide impellers are evenly distributed around the outer peripheral wall of the drill bit. The radial cross section of the guide impellers is arc-shaped and the arc direction of the several guide impellers is consistent.

6. The cross-contamination prevention staggered soil sampling device according to claim 1, characterized in that: The sealing plate and the guide bump are magnetically attached to achieve the adhesion or separation of the sealing plate and the contact surface.

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