A soil sampling device that is easy to seal

Abstract

The application belongs to the technical field of soil investigation, and discloses a soil sampling device convenient for sealing, which comprises a sampling pipe, a connecting rod assembly and a sealing plate. The connecting rod assembly is located on one side of the sampling pipe and is slidably connected with the sampling pipe up and down. The bottom of the sampling pipe is provided with a first notch on one side of the connecting rod assembly. The opposite sides of the sealing plate are rotationally connected with the bottom of the sampling pipe. The bottom of the connecting rod assembly is rotationally connected with the sealing plate. The sampling pipe has a first position above and a second position below relative to the connecting rod assembly. The connecting rod assembly drives the sealing plate to rotate around the bottom of the sampling pipe by switching the position relative to the sampling pipe. In the first position, the sealing plate is located at the first notch to open the bottom opening of the sampling pipe. In the second position, the sealing plate is located inside the sampling pipe to close the bottom opening of the sampling pipe, so that the soil sampling device can keep the original state of the soil during soil collection, quickly seal the soil after the collection is completed to prevent soil loss, and ensure the integrity and reliability of soil collection.

Description

Technical Field

[0001] This invention belongs to the technical field of soil sampling, and more specifically, relates to a soil sampling device that is easy to seal. Background Technology

[0002] In geotechnical investigation and soil surveying, soil samples are collected using sampling devices. These devices are typically controlled by impact or rotary drilling to penetrate the soil. In different soil environments, the drilling process exposes the sampling device to varying degrees of impact or vibration. Therefore, the design and selection of the sampling device have a crucial impact on the amount and integrity of the collected soil samples. Existing sampling devices, such as those used for underwater soil sampling, usually employ open or spring-loaded sealing structures. Open structures are simple and easy to operate, but they may lead to some leakage during sampling, especially in underwater environments where the soil texture is relatively loose and weak with lower lateral friction. This makes it easier for the sample to leak out during the process of raising the sampling tube to the surface due to water flow, significantly reducing the sampling rate. The claw spring sealing structure uses the elastic deformation of the steel sheet to obtain samples during entry into the soil and seal them to prevent leakage during exit from the soil. However, because the plate-like structure of the claw spring will squeeze and cut the soil during the insertion of the sampling tube into the soil, it will form "scratches" on the soil surface, which will damage the integrity of the soil sample entering the tube and cannot maintain the original state of the soil.

[0003] Therefore, in order to improve the quality and integrity of soil samples and enhance the applicability of sampling devices in different soil environments, it is urgent to develop a new type of soil sampling device to solve the problems of soil loss and inability to maintain the original soil condition during sampling. Summary of the Invention

[0004] To address the problems of soil loss and inability to preserve the original soil condition in existing soil sampling devices, this invention provides a soil sampling device that is easy to seal. The purpose is to use a rotatable sealing plate to keep the soil in its original condition during the soil sampling process and to quickly seal the device after sampling to prevent soil loss, thus ensuring the integrity and reliability of soil sampling.

[0005] To achieve the above objectives, according to one aspect of the present invention, a soil sampling device with easy sealing is provided, comprising a sampling tube and a sealing mechanism. The sealing mechanism includes a connecting rod assembly and a sealing plate. The bottom of the sampling tube is open. The connecting rod assembly is located on one side of the sampling tube and is slidably connected vertically to the sampling tube. The bottom of the sampling tube has a first notch on one side of the connecting rod assembly. The sealing plate is an arc-shaped plate. The opposite sides of the sealing plate are rotatably connected to the bottom of the sampling tube, respectively. The bottom of the connecting rod assembly is rotatably connected to the sealing plate. The sampling tube has a first position above the connecting rod assembly and a second position below the connecting rod assembly. The connecting rod assembly drives the sealing plate to rotate around the bottom of the sampling tube by switching its position relative to the sampling tube between the first position and the second position. In the first position, the sealing plate is located at the first notch and extends along the bottom of the sampling tube, thereby opening the bottom opening of the sampling tube. In the second position, the sealing plate is located inside the sampling tube, thereby closing the bottom opening of the sampling tube.

[0006] Preferably, the linkage assembly includes a sliding linkage and a rotating linkage. The lower end of the sliding linkage and the upper end of the rotating linkage are rotatably connected, and the lower end of the rotating linkage and the lower end of the sealing plate are rotatably connected. The opposite sides of the sealing plate are rotatably connected to the sampling tube on the inner side of the sampling tube, and the two rotatable connection positions are located at the same height of the sampling tube. The rotation plane of the rotating linkage is perpendicular to the line connecting the two rotatable connection positions.

[0007] Preferably, the line connecting the two rotating connection positions intersects the central axis of the sampling tube, and the rotation plane of the rotating link also passes through the central axis of the sampling tube.

[0008] Preferably, in the second position, the projected area of ​​the sealing plate along the axial direction of the sampling tube is consistent with the cross-sectional area of ​​the sampling tube.

[0009] Preferably, the bottom of the sampling tube has a second notch on the other side; in the first position, the bottom surface of the sealing plate is a slope.

[0010] Preferably, the bottom surface of the sampling tube at the second notch is an inclined surface, and in the first position, the bottom surface of the sampling tube at the second notch and the bottom surface of the sealing plate are located on the same plane.

[0011] Preferably, the soil sampling device is further provided with a guide rod and a top crossbar. The guide rod and the sliding connecting rod are located on both sides of the sampling tube. The upper end of the guide rod and the upper end of the sliding connecting rod are fixedly connected by the top crossbar. The sampling tube is provided with limiting holes on corresponding sides, and the sliding connecting rod and the guide rod pass through the corresponding limiting holes.

[0012] Preferably, the sliding link and the guide rod are respectively provided with limiting balls at the same height relative to the sampling tube, the limiting holes on both sides of the sampling tube are located at the same height, the diameter of the limiting ball is larger than the diameter of the limiting hole, and in the second position, the lower end of the limiting hole abuts against the limiting ball.

[0013] Preferably, the soil sampling device further includes a rotating rod and a locking collar. The two ends of the rotating rod are rotatably connected to the sliding connecting rod and the guide rod. The rotating rod has a locking rod section, the width of which is smaller than the length of which is smaller. The locking collar is fixedly connected to the upper end of the sampling tube. The upper end of the locking collar has a locking opening with an opening between the length and width of the locking rod section. In the first position, the length of the locking rod section faces the locking opening, and the locking collar is fitted onto the locking rod section. In the second position, the width of the locking rod section faces the locking opening, and the locking collar disengages from the locking rod section.

[0014] According to another aspect of the present invention, a sampling method for a soil sampling device that is easy to seal is provided, which mainly includes the following steps:

[0015] Step 1: The sampling tube slides relative to the connecting rod assembly to the first position, and the sealing plate rotates to the first notch under the drive of the connecting rod assembly, thus opening the bottom opening of the sampling tube;

[0016] Step 2: The soil sampling device is inserted into the sampling object, allowing the sampling object to enter the sampling tube for sampling;

[0017] Step 3: After sampling is completed, lift the soil sampling device to expose the sampling surface;

[0018] Step 4: The sampling tube slides relative to the connecting rod assembly to the second position, and the sealing plate rotates into the inside of the sampling tube under the drive of the connecting rod assembly, thus closing the bottom opening of the sampling tube;

[0019] Step 5: Retrieve the soil sampling device to complete the sampling.

[0020] In summary, the technical solutions conceived in this invention have the following technical effects compared with the prior art:

[0021] 1. A soil sampling device with easy sealing is provided, wherein a connecting rod assembly and a sampling tube are slidably connected vertically, and the opposite sides of the sealing plate are rotatably connected to the bottom of the sampling tube. The bottom of the sampling tube is provided with a first notch, so that when the soil sampling device enters the soil and performs sampling, the sealing plate extends along the bottom of the sampling tube at the first notch without interfering with the soil collection. When the sampling is completed, the sampling tube slides from the first position to the second position relative to the connecting rod assembly, and the connecting rod assembly drives the sealing plate to rotate around the bottom of the sampling tube, so that the bottom opening of the sampling tube is closed, preventing the soil from falling downward, thereby maintaining the original state of the soil, preventing soil loss, ensuring the integrity and reliability of soil collection, and improving the applicability of the sampling device in different soil environments;

[0022] 2. This invention sets two opposite sides of a sealing plate to be rotatably connected to the sampling tube on the inner side of the sampling tube. The two rotatable connection positions are located at the same height of the sampling tube, and the line connecting the two rotatable connection positions passes through the central axis of the sampling tube. This allows the sealing plate to rotate around the diameter of the bottom cross-section of the sampling tube under the drive of the connecting rod assembly. The projected area of ​​the sealing plate on the axial direction of the sampling tube is set to be consistent with the cross-sectional area of ​​the sampling tube. In the second position, the edge of the sealing plate is in contact with the inner wall of the sampling tube, preventing soil samples from leaking out of the gap between the sealing plate and the sampling tube, thus improving the sealing effect.

[0023] 3. The present invention provides a second notch on the other side of the bottom of the sampling tube, and in the first position, the bottom surface of the sealing plate is inclined, so that when the sampling tube enters the soil, the contact area with the soil is reduced, thereby increasing the pressure and facilitating the insertion of the sampling tube into the soil;

[0024] 4. The present invention provides limiting holes of the same height on both sides of the sampling tube, and the sliding connecting rod and the guide rod pass through the corresponding limiting holes. The sliding connecting rod and the guide rod are respectively provided with limiting balls at the same height relative to the sampling tube, so that in the second position, the lower end of the limiting hole abuts against the limiting ball, thereby limiting the sampling tube when it slides downward relative to the connecting rod assembly, and improving the stability of the soil sampling device.

[0025] 5. The present invention features a rotating rod rotatably connected at both ends to a sliding connecting rod and a guide rod. The rotating rod has a locking section and a locking collar fixedly connected to the upper end of the sampling tube. The upper end of the locking collar has a locking opening with an opening between the major and minor diameters of the locking section. By controlling the rotating rod to rotate until the minor diameter of the locking section faces the locking collar, the locking collar disengages from the rotating rod. Consequently, the sampling tube slides downward relative to the connecting rod assembly due to its own gravity, moving from the first position to the second position, thus achieving rapid sealing of the sampling device. Attached Figure Description

[0026] Figure 1This is a schematic diagram of a soil sampling device that is easy to seal, provided by an embodiment of the present invention, with the sampling tube in the first position;

[0027] Figure 2 This is a schematic diagram of a soil sampling device that is easy to seal, provided in an embodiment of the present invention, with the sampling tube in the second position;

[0028] Figure 3 This is a schematic diagram of a soil sampling device that is easy to seal, provided in an embodiment of the present invention, during the process of switching the sampling tube from the first position to the second position;

[0029] Figure 4 This is a schematic diagram of the top cap structure of the sampling tube provided in an embodiment of the present invention;

[0030] Figure 5 This is a cross-sectional schematic diagram showing the positional relationship between the locking rod segment and the locking collar provided in an embodiment of the present invention;

[0031] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0032] 1-Sliding connecting rod, 2-Sampling tube, 3-Rotating connecting rod, 4-Sealing plate, 5-Top crossbar, 6-Guide rod, 7-Rotating rod, 701-Clamping rod section, 8-Clamping collar, 801-Clamping, 9-Top cover, 901-Limiting hole, 902-First thread, 903-Second thread, 10-Limiting ball, 11-First hinge, 12-Second hinge, 13-Third hinge, 14-Fourth hinge. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0034] The technical solution of the present invention will now be described in detail with reference to specific embodiments.

[0035] Example 1:

[0036] Please see Figure 1 and Figure 2This embodiment provides a soil sampling device that is easy to seal, including a sampling tube 2 and a sealing mechanism. The sealing mechanism includes a connecting rod assembly and a sealing plate 4. The bottom of the sampling tube 2 is open. The connecting rod assembly is located on one side of the sampling tube 2 and is slidably connected to the sampling tube 2 vertically. The bottom of the sampling tube 2 has a first notch on one side of the connecting rod assembly. The sealing plate 4 is an arc-shaped plate. The opposite sides of the sealing plate 4 are rotatably connected to the bottom of the sampling tube 2. The bottom of the connecting rod assembly is rotatably connected to the sealing plate 4. The sampling tube 2 has a first position above the connecting rod assembly and a second position below the connecting rod assembly. The connecting rod assembly drives the sealing plate 4 to rotate around the bottom of the sampling tube 2 by switching its position relative to the sampling tube 2 between the first position and the second position. In the first position, the sealing plate 4 is located at the first notch and extends along the bottom of the sampling tube 2, so that the bottom opening of the sampling tube 2 is open. In the second position, the sealing plate 4 is located inside the sampling tube 2, so that the bottom opening of the sampling tube 2 is closed.

[0037] During the soil sampling process, when the soil sampling device enters the soil and takes samples, sampling tube 2 is in the first position, such as... Figure 1 As shown, the sealing plate 4 extends along the bottom of the sampling tube 2 at the first notch, without interfering with soil collection; when sampling is completed, the sampling tube 2 slides from the first position to the second position relative to the connecting rod assembly, and the soil sampling device in the second position is as follows: Figure 2 As shown, the soil sampling device during the process of switching from the first position to the second position is as follows: Figure 3 As shown, the connecting rod assembly drives the sealing plate 4 to rotate around the bottom of the sampling tube 2, thereby closing the bottom opening of the sampling tube 2 and preventing soil from falling downwards. This helps to maintain the original state of the soil, prevent soil loss, ensure the integrity and reliability of soil collection, and improve the applicability of the sampling device in different soil environments.

[0038] Specifically, the linkage assembly includes a sliding linkage 1 and a rotating linkage 3. The lower end of the sliding linkage 1 and the upper end of the rotating linkage 3 are rotatably connected by a first hinge 11, and the lower end of the rotating linkage 3 and the lower end of the sealing plate 4 are rotatably connected by a second hinge 12. The opposite sides of the sealing plate 4 are rotatably connected to the sampling tube 2 inside the sampling tube 2 by a third hinge 13 and a fourth hinge 14, respectively. The third hinge 13 and the fourth hinge 14 are located at the same height of the sampling tube 2, and the line connecting the third hinge 13 and the fourth hinge 14 is the rotation axis. The rotation plane of the rotating linkage 3 is perpendicular to the rotation axis, so that during the process of the sampling tube 2 changing from the first position to the second position, the lower end of the rotating linkage 3 rotates away from the sampling tube 2, thereby driving the lower end of the sealing plate 4 to rotate upward until the sealing plate 4 rotates into the sampling tube 2.

[0039] As a further preferred embodiment, the rotating shaft intersects with the central axis of the sampling tube 2, causing the sealing plate 4 to rotate around the diameter of the bottom section of the sampling tube 2 under the drive of the connecting rod assembly; the rotating plane of the rotating connecting rod 3 also passes through the central axis of the sampling tube 2, so that the second hinge 12 is connected to the central axis of the sealing plate 4, thereby balancing the forces of each component during the transmission process and improving the stability of the soil sampling device.

[0040] Specifically, in the second position, the projected area of ​​the sealing plate 4 along the axial direction of the sampling tube 2 is consistent with the cross-sectional area of ​​the sampling tube 2, so that the edge of the sealing plate 4 fits against the inner wall of the sampling tube 2 in the second position, preventing soil samples from leaking out from the gap between the sealing plate 4 and the sampling tube 2, and improving the sealing effect.

[0041] Specifically, the bottom of the sampling tube 2 has a second notch on the other side; in the first position, the bottom surface of the sealing plate 4 is inclined, so that when the sampling tube 2 enters the soil, the contact area with the soil is reduced, thereby increasing the pressure and making it easier for the sampling tube 2 to be inserted into the soil.

[0042] Specifically, the bottom surface of the sampling tube 2 on one side of the second notch is inclined, and in the first position, the bottom surface of the sampling tube 2 on the side of the second notch and the bottom surface of the sealing plate 4 are on the same plane, forming a wedge-shaped lower end of the sampling tube 2, which facilitates the insertion of the sampling tube 2 into the soil.

[0043] As a further preferred embodiment, the sampling tube 2 has a circular inner cross-section. The bottom surfaces of the sampling tube 2 at both the first and second notches are inclined planes. The bottom surfaces at the first and second notches are symmetrical about the planes formed by the central axis and rotation axis of the sampling tube 2, and both are at 45° to the central axis of the sampling tube 2. The sealing plate 4 is an arc-shaped plate with an arcuate curvature consistent with the inner wall of the sampling tube 2, obtained by cutting a circle perpendicular to the axis with a diameter consistent with the inner diameter of the sampling tube 2. The planes on both sides formed are perpendicular to each other. This embodiment achieves that in the first position, the bottom surface of the sampling tube 2 at the second notch and the bottom surface of the sealing plate 4 are on the same plane, forming a wedge-shaped sampling surface, facilitating the insertion of the sampling tube 2 into the soil. In the second position, the two sides of the sealing plate 4 are coplanar with the bottom surfaces of the sampling tube 2 at the first and second notches, achieving a fit between the sealing plate 4 and the lower end of the sampling tube 2.

[0044] In some embodiments, the soil sampling device further includes a guide rod 6 and a top crossbar 5. The guide rod 6 and the sliding connecting rod 1 are located on both sides of the sampling tube 2. The upper ends of the guide rod 6 and the upper ends of the sliding connecting rod 1 are fixedly connected by the top crossbar 5. The sampling tube 2 includes a top cap 9 fixedly connected to the upper end of the sampling tube 2 by a first thread 902. Figure 4As shown, the top cover 9 is provided with limiting holes 901 on both sides. The sliding connecting rod 1 and the guide rod 6 pass through the corresponding limiting holes 901 to guide the sampling tube 2 from the first position to the second position.

[0045] Specifically, the sliding connecting rod 1 and the guide rod 6 are respectively provided with limiting balls 10 at the same height relative to the sampling tube 2. The limiting holes 901 on both sides of the sampling tube 2 are located at the same height. The diameter of the limiting ball 10 is larger than the aperture of the limiting hole 901. In the second position, the lower end of the limiting hole 901 abuts against the limiting ball 10, which plays a limiting role in the sliding of the sampling tube 2 from the first position to the second position, avoiding a large impact on the hinge structure at the lower end of the sampling tube 2 and improving the stability of the soil sampling device.

[0046] In a further preferred embodiment, the soil sampling device also includes a rotating rod 7 and a locking collar 8. The two ends of the rotating rod 7 are rotatably connected to the sliding connecting rod 1 and the guide rod 6. The rotating rod 7 has a locking rod section 701, the width of which is smaller than the length of the section. The locking collar 8 is fixedly connected to the top cover 9 by a second thread 903. The upper end of the locking collar 8 has a locking slot 801 with an opening between the length and width of the section of the locking rod section 701. In the first position, the length of the section of the locking rod section 701 faces the locking slot 801, and the locking collar 8 is fitted onto the locking rod section 701. Figure 5 As shown in (a), the lower end of the sampling tube 2 is open for sampling; when the control lever 7 rotates so that the wide diameter of the cross-section of the locking rod section 701 faces the bayonet 801, the bayonet collar 8 disengages from the locking rod section 701, as shown in (a). Figure 5 As shown in (b), the sampling tube 2 slides to the second position under its own gravity, and then the sealing plate 4 rotates to achieve sealing.

[0047] In a second preferred embodiment, the sampling device is further provided with a rotating rod 7 and a traction rope above the sampling tube 2. The two ends of the rotating rod 7 are rotatably connected to the sliding connecting rod 1 and the guide rod 6, respectively; the two ends of the traction rope are connected to the top cover 9 and the rotating rod 7, respectively. In the first position, the traction rope is wrapped around the rotating rod 7, and the lower opening of the sampling tube 2 is open for sampling; when the rotating rod 7 is controlled to rotate, causing the traction rope to unwrap, the sampling tube 2 slides to the second position under its own gravity, and then the sealing plate 4 rotates to seal the tube.

[0048] Example 2:

[0049] This embodiment provides a sampling method for a soil sampling device that is easy to seal, which mainly includes the following steps:

[0050] Step 1: The sampling tube 2 slides relative to the connecting rod assembly to the first position, and the sealing plate 4 rotates to the first notch under the drive of the connecting rod assembly, and the bottom opening of the sampling tube 2 is opened;

[0051] Step 2: The soil sampling device is inserted into the sampling object, allowing the sampling object to enter the sampling tube 2 for sampling;

[0052] Step 3: After sampling is completed, lift the soil sampling device to expose the sampling surface;

[0053] Step 4: Control the rotating rod 7 to rotate, so that the sampling tube 2 slides relative to the connecting rod assembly to the second position under its own weight. The sealing plate 4 rotates into the inside of the sampling tube 2 under the drive of the connecting rod assembly, and the bottom opening of the sampling tube 2 is closed.

[0054] Step 5: Retrieve the soil sampling device to complete the sampling.

[0055] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A soil sampling device for facilitating sealing, characterized in that, The sampling tube (2) and the sealing mechanism, the sealing mechanism includes connecting rod assembly and sealing plate (4), the bottom of the sampling tube (2) is open, the connecting rod assembly is located on one side of the sampling tube (2) and is slidably connected with the sampling tube (2) up and down, the bottom of the sampling tube (2) is provided with a first notch on one side of the connecting rod assembly, the sealing plate (4) is an arc plate, the opposite sides of the sealing plate (4) are respectively rotatably connected with the bottom of the sampling tube (2), the bottom of the connecting rod assembly is rotatably connected with the sealing plate (4), the sampling tube (2) has a first position above and a second position below relative to the connecting rod assembly, the connecting rod assembly drives the sealing plate (4) to rotate around the bottom of the sampling tube (2) by switching the position between the first position and the second position relative to the sampling tube (2), in the first position, the sealing plate (4) is located at the first notch and extends along the bottom of the sampling tube (2) to open the bottom opening of the sampling tube (2), in the second position, the sealing plate (4) is located inside the sampling tube (2) to close the bottom opening of the sampling tube (2).

2. The soil sampling device of claim 1, wherein, The connecting rod assembly includes a sliding connecting rod (1) and a rotating connecting rod (3), the lower end of the sliding connecting rod (1) is rotatably connected with the upper end of the rotating connecting rod (3), the lower end of the rotating connecting rod (3) is rotatably connected with the lower end of the sealing plate (4); the opposite sides of the sealing plate (4) are respectively rotatably connected with the sampling tube (2) on the inside of the sampling tube (2), the two rotatable connection positions are located at the same height of the sampling tube (2), and the rotating plane of the rotating connecting rod (3) is perpendicular to the line between the two rotatable connection positions.

3. The soil sampling device of claim 2, wherein the cap is configured to be removed from the body by a user. The line between the two rotatable connection positions intersects with the central axis of the sampling tube (2), and the rotating plane of the rotating connecting rod (3) also passes through the central axis of the sampling tube (2).

4. The soil sampling device of claim 3, wherein the cap is configured to be removed from the body by a user. In the second position, the projection area of the sealing plate (4) on the axial direction of the sampling tube (2) is consistent with the cross-sectional area of the sampling tube (2).

5. The soil sampling device of claim 4, wherein the cap is configured to be removed from the body by a user. The bottom of the sampling tube (2) is provided with a second notch on the other side; in the first position, the bottom surface of the sealing plate (4) is an inclined surface.

6. The soil sampling device of claim 5, wherein the cap is configured to be removed from the body by a user. The bottom surface of the sampling tube (2) at the second notch is an inclined surface, and in the first position, the bottom surface of the sampling tube (2) at the second notch and the bottom surface of the sealing plate (4) are located on the same plane.

7. A soil sampling device for facilitating closure as claimed in any one of claims 2 to 6 wherein, The soil sampling device is also provided with a guide rod (6) and a top cross bar (5), the guide rod (6) and the sliding connecting rod (1) are located on both sides of the sampling tube (2), the upper end of the guide rod (6) and the upper end of the sliding connecting rod (1) are fixedly connected through the top cross bar (5), the sampling tube (2) is respectively provided with a limiting hole (901) on the corresponding two sides, and the sliding connecting rod (1) and the guide rod (6) respectively pass through the corresponding limiting hole (901).

8. The soil sampling device of claim 7, wherein the cap is configured to be removed from the body by a user. The sliding connecting rod (1) and the guide rod (6) are respectively provided with a limiting ball (10) at the same height relative to the sampling tube (2), the sampling tube (2) is provided with limiting holes (901) at the same height on both sides, the diameter of the limiting ball (10) is greater than the hole diameter of the limiting hole (901), and the lower end of the limiting hole (901) abuts against the limiting ball (10) in the second position.

9. The soil sampling device of claim 8, wherein the cap is configured to be removed from the body by a user. The soil sampling device is further provided with a rotating rod (7) and a bayonet sleeve (8), both ends of the rotating rod (7) are rotatably connected to the sliding connecting rod (1) and the guide rod (6), the rotating rod (7) is provided with a clamping rod section (701), the cross-sectional width of the clamping rod section (701) is smaller than the cross-sectional length of the clamping rod section (701); the bayonet sleeve (8) is fixedly connected to the upper end of the sampling tube (2), the upper end of the bayonet sleeve (8) is provided with a bayonet (801) with an opening between the length and the width of the cross section of the clamping rod section (701); in the first position, the length of the cross section of the clamping rod section (701) faces the bayonet (801), the bayonet sleeve (8) is sleeved on the clamping rod section (701), and in the second position, the width of the cross section of the clamping rod section (701) faces the bayonet (801), and the bayonet sleeve (8) is separated from the clamping rod section (701).

10. The soil sampling method of the soil sampling device for facilitating the sealing of the opening according to any one of claims 1 to 9, wherein The method mainly comprises the following steps: Step 1: the sampling tube (2) slides relative to the connecting rod assembly to the first position, the sealing plate (4) is driven by the connecting rod assembly to rotate to the first gap, and the bottom opening of the sampling tube (2) is opened; Step 2: the soil sampling device is inserted into the sampling object, so that the sampling object enters the sampling tube (2) for sampling; Step 3: after sampling, the soil sampling device is lifted out of the sampling surface; Step 4: the sampling tube (2) slides relative to the connecting rod assembly to the second position, the sealing plate (4) is driven by the connecting rod assembly to rotate to the inside of the sampling tube (2), and the bottom opening of the sampling tube (2) is closed; Step 5: the soil sampling device is retracted, and the sampling is completed.

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