Soil sampling device convenient to seal

Abstract

The invention belongs to the related technical field of soil investigation, and discloses a soil sampling device convenient to seal, the soil sampling device 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, and the bottom of the sampling pipe is provided with a first notch on one side of the connecting rod assembly; the two 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 is provided with a first position located on the upper portion and a second position located on the lower portion relative to the connecting rod assembly, and the connecting rod assembly drives the sealing plate to rotate around the bottom of the sampling pipe through position switching 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, and in the second position, the sealing plate is located in the sampling pipe to close the bottom opening of the sampling pipe, so that the soil sampling device keeps the original state of soil in the soil collection process, and the soil is quickly sealed to prevent soil loss after collection is finished, thereby ensuring the integrity and reliability of soil collection.

Description

Technical Field

[0001] The invention belongs to the technical field related to soil sampling, and more specifically, relates to a soil sampling device which is easy to seal. Background Art

[0002] In the field of geotechnical survey and soil investigation, it is necessary to use a sampling device to collect soil samples. The sampling device is usually controlled by impact or rotation to drill into the soil for soil sampling. In different soil environments, the soil drilling process will bring different degrees of intensity impact or vibration impact to the sampling device. Therefore, the design and selection of the sampling device have a crucial impact on the collection quantity and integrity of soil samples. In existing sampling devices, such as underwater soil sampling, an open structure or a claw spring sealing structure is usually used. The open structure has the characteristics of simple structure and easy operation, but it may cause a certain degree of leakage of soil samples during the sampling process, especially in underwater soil environments. The soil texture is relatively loose and weak, and the side friction resistance is smaller. It is easier to flow out due to water flow during the process of lifting the sampling tube to the surface, and the sampling rate will be significantly reduced. The claw spring sealing structure can obtain samples during the process of entering the soil and seal to prevent leakage during the process of leaving the soil through the elastic deformation of the steel sheet. However, the sheet structure of the claw spring will squeeze and cut the soil during the process of inserting the sampling tube into the soil, forming "scratches" on the soil surface, destroying the integrity of the soil sample entering the tube and making it impossible to 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 urgently necessary to develop a new type of soil sampling device to solve the problem of soil loss during the sampling process and the inability to maintain the original state of the soil for collection. Summary of the invention

[0004] In view of the problems of soil loss and inability to keep the soil in its original state during collection in existing soil sampling devices, the present invention provides a soil sampling device that is easy to seal. The purpose is to set a rotatable sealing plate so that the sampling device can keep the soil in its original state during the soil collection process and quickly seal it after collection to prevent soil loss, thereby ensuring the integrity and reliability of soil collection.

[0005] To achieve the above-mentioned purpose, according to one aspect of the present invention, a soil sampling device that is easy to seal is provided, comprising a sampling tube and a sealing mechanism, wherein the sealing mechanism comprises a connecting rod assembly and a sealing plate, the bottom of the sampling tube is open, the connecting rod assembly is located at one side of the sampling tube and is slidably connected to the sampling tube up and down, a first notch is provided at one side of the connecting rod assembly at the bottom of the sampling tube, the sealing plate is an arc-shaped plate, 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 located at the top and a second position located at the bottom relative to 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 between the first position and the second position relative to the sampling tube, in the first position, the sealing plate is located at the first notch and extends along the bottom of the sampling tube so that the bottom opening of the sampling tube is opened, and in the second position, the sealing plate is located inside the sampling tube so that the bottom opening of the sampling tube is closed.

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

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

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

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

[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 in the same plane.

[0011] Preferably, the soil sampling device is also provided with a guide rod and a top cross bar, 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 through the top cross bar, the sampling tube is provided with limiting holes on the corresponding two sides, and the sliding connecting rod and the guide rod pass through the corresponding limiting holes respectively.

[0012] Preferably, the sliding connecting rod and the guide rod are respectively provided with limiting balls at the same height relative to the sampling tube, the limiting holes on the corresponding sides of the sampling tube are located at the same height, the diameter of the limiting ball is larger than the aperture 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 is also provided with a rotating rod and a bayonet ring, the two ends of the rotating rod can be rotatably connected to the sliding connecting rod and the guide rod, the rotating rod is provided with a locking rod segment, the cross-sectional width diameter of the locking rod segment is smaller than the cross-sectional long diameter of the locking rod segment; the bayonet ring is fixedly connected to the upper end of the sampling tube, and the upper end of the bayonet ring is provided with a bayonet with an opening between the long diameter and the wide diameter of the cross-sectional area of ​​the locking rod segment; in the first position, the long diameter of the cross-sectional area of ​​the locking rod segment faces the bayonet, and the bayonet ring is sleeved on the locking rod segment, and in the second position, the wide diameter of the cross-sectional area of ​​the locking rod segment faces the bayonet, and the bayonet ring is detached from the locking rod segment.

[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 comprises the following steps:

[0015] Step 1: The sampling tube slides to a first position relative to the connecting rod assembly, the sealing plate rotates to a first notch driven by the connecting rod assembly, and the bottom opening of the sampling tube is opened;

[0016] Step 2: inserting the soil sampling device into the sampling object, so that the sampling object enters the sampling tube for sampling;

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

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

[0019] Step 5: Retract the soil sampling device and complete the sampling.

[0020] In general, the above technical solutions conceived by the present invention have the following technical effects compared with the prior art:

[0021] 1. Provide a soil sampling device that is easy to seal. The connecting rod assembly and the sampling tube are slidably connected up and down, and the opposite sides of the sealing plate are rotatably connected to the bottom of the sampling tube. A first notch is provided at the bottom of the sampling tube, so that when the soil sampling device enters the soil and performs sampling, the sealing plate is located at the first notch and extends along the bottom of the sampling tube without interfering with 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 to prevent 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. The present invention sets two opposite sides of the sealing plate to be rotatably connected to the sampling tube on the inner side of the sampling tube, respectively. The two rotatably connected positions are located at the same height of the sampling tube, and the line between the two rotatably connected positions passes through the central axis of the sampling tube, so that the sealing plate rotates around the diameter of the bottom cross section of the sampling tube under the drive of the connecting rod assembly, and the projection area of ​​the sealing plate in the axial direction of the sampling tube is set to be consistent with the cross-sectional area of ​​the sampling tube, so that in the second position, the edge of the sealing plate fits with the inner wall of the sampling tube, thereby preventing the soil sample from being lost from the gap between the sealing plate and the sampling tube, thereby 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 an inclined surface, so that when the sampling tube enters the soil, the contact area with the soil is reduced, thereby increasing the pressure, making it easier for the sampling tube to be inserted into the soil;

[0024] 4. The present invention provides limiting holes of the same height on the corresponding two sides of the sampling tube, the sliding connecting rod and the guide rod pass through the corresponding limiting holes respectively, and the sliding connecting rod and the guide rod are 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, thereby improving the stability of the soil sampling device;

[0025] 5. The present invention provides a rotating rod with two ends rotatably connected to the sliding connecting rod and the guide rod, the rotating rod is provided with a locking rod section, and a bayonet ring fixedly connected to the upper end of the sampling tube, and a bayonet with an opening between the long diameter and the wide diameter of the cross-section of the locking rod section is provided at the upper end of the bayonet ring, so that the bayonet ring can be separated from the rotating rod by controlling the rotating rod to rotate until the wide diameter of the locking rod section faces the bayonet, and then the sampling tube slides downward relative to the connecting rod assembly due to its own gravity, and moves from the first position to the second position, thereby realizing rapid sealing of the sampling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It 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 being in a first position;

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

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

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

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

[0031] Throughout the 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 cross bar, 6-guide rod, 7-rotating rod, 701-clamping rod section, 8-bayonet ring, 801-bayonet, 9-top sealing 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 DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present 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 is described in detail below with specific embodiments.

[0035] Embodiment 1:

[0036] See also Figure 1 and Figure 2The present embodiment provides a soil sampling device that is easy to seal, comprising a sampling tube 2 and a sealing mechanism, wherein the sealing mechanism comprises a connecting rod assembly and a sealing plate 4, the bottom of the sampling tube 2 is open, the connecting rod assembly is located at one side of the sampling tube 2 and is slidably connected to 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-shaped plate, the opposite sides of the sealing plate 4 are rotatably connected to the bottom of the sampling tube 2 respectively, the bottom of the connecting rod assembly is rotatably connected to the sealing plate 4, the sampling tube 2 has a first position located at the top and a second position located at the bottom 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 so that the bottom opening of the sampling tube 2 is opened, and 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] When the soil sampling device enters the soil and takes samples, the sampling tube 2 is located at the first position. Figure 1 As shown, the sealing plate 4 is located at the first notch and extends along the bottom of the sampling tube 2 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 with the sampling tube 2 in the second position is as shown in FIG. Figure 2 As shown, the soil sampling device during the conversion from the first position to the second position is as shown in Figure 3 As shown, the connecting rod assembly drives the sealing plate 4 to rotate around the bottom of the sampling tube 2 so that the bottom opening of the sampling tube 2 is closed to prevent 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.

[0038] Specifically, 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 and the upper end of the rotating connecting rod 3 are rotatably connected through a first hinge 11, and the lower end of the rotating connecting rod 3 and the lower end of the sealing plate 4 are rotatably connected through a second hinge 12; the opposite sides of the sealing plate 4 are rotatably connected to the sampling tube 2 on the inner side of the sampling tube 2 through 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 connecting line between the third hinge 13 and the fourth hinge 14 is the rotation axis, and the rotation plane of the rotating connecting rod 3 is perpendicular to the rotation axis, so that in the process of the sampling tube 2 being converted from the first position to the second position, the lower end of the rotating connecting rod 3 rotates in a direction 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 to the inside of the sampling tube 2.

[0039] As a further preferred embodiment, the rotating axis intersects with the central axis of the sampling tube 2, so that the sealing plate 4 rotates around the diameter of the bottom cross section of the sampling tube 2 driven by 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, so that the forces of each component in the transmission process are balanced, thereby improving the working stability of the soil sampling device.

[0040] Specifically, in the second position, the projection area of ​​the sealing plate 4 in 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 with the inner wall of the sampling tube 2 in the second position, avoiding the loss of soil samples from the gap between the sealing plate 4 and the sampling tube 2, thereby improving the sealing effect.

[0041] Specifically, a second notch is provided on the other side of the bottom of the sampling tube 2; in the first position, the bottom surface of the sealing plate 4 is an inclined surface, so that when the sampling tube 2 enters the soil, the contact area with the soil is reduced, thereby increasing the pressure, 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 the second notch side is an inclined surface, and in the first position, the bottom surface of the sampling tube 2 on the second notch side and the bottom surface of the sealing plate 4 are located in the same plane, together 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 inner cross-section of the sampling tube 2 is circular, and the bottom surfaces of the sampling tube 2 at the first notch and the second notch are both inclined surfaces. The bottom surfaces at the first notch and the second notch are symmetrical about the plane formed by the central axis and the rotation axis of the sampling tube 2, and both are 45° to the central axis of the sampling tube 2; the sealing plate 4 is an arc-shaped plate with a curvature consistent with the inner wall of the sampling tube 2, obtained by intercepting a circle with a diameter consistent with the inner diameter of the sampling tube 2 perpendicular to the axis, and the planes formed on both sides are perpendicular to each other. This embodiment realizes 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 located in the same plane, forming a wedge-shaped sampling surface together, which is convenient for the sampling tube 2 to be inserted into the soil; in the second position, the two sides of the sealing plate 4 correspond to the bottom surfaces of the sampling tube 2 at the first notch and the second notch, which are coplanar, so as to realize the cooperation between the sealing plate 4 and the lower end of the sampling tube 2.

[0044] In some embodiments, the soil sampling device is further provided with a guide rod 6 and a top cross bar 5, wherein the guide rod 6 and the sliding connecting rod 1 are located on both sides of the sampling tube 2, and the upper end of the guide rod 6 and the upper end of the sliding connecting rod 1 are fixedly connected via the top cross bar 5; the sampling tube 2 includes a top cover 9 fixedly connected to the upper end of the sampling tube 2 via a first thread 902, such as Figure 4As shown, the top cover 9 is provided with limiting holes 901 on the corresponding two sides, and the sliding connecting rod 1 and the guide rod 6 pass through the corresponding limiting holes 901 respectively, so as to guide the sampling tube 2 to slide from the first position to the second position.

[0045] Specifically, 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, and the limiting holes 901 on the corresponding 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] As a further preferred embodiment, the soil sampling device is further provided with a rotating rod 7 and a bayonet 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 is provided with a snap-fit ​​rod segment 701. The cross-sectional width diameter of the snap-fit ​​rod segment 701 is smaller than the cross-sectional long diameter of the snap-fit ​​rod segment 701. The bayonet collar 8 is fixedly connected to the top cover 9 via a second thread 903. The upper end of the bayonet collar 8 is provided with a bayonet 801 whose opening is between the long diameter and the wide diameter of the cross-sectional area of ​​the snap-fit ​​rod segment 701. In the first position, the long diameter of the cross-sectional area of ​​the snap-fit ​​rod segment 701 faces the bayonet 801, and the bayonet collar 8 is sleeved on the snap-fit ​​rod segment 701. Figure 5 As shown in (a), at this time, the lower end of the sampling tube 2 is opened for sampling; when the control lever 7 is rotated so that the wide diameter of the cross section of the engaging rod segment 701 faces the bayonet 801, the bayonet collar 8 is separated from the engaging rod segment 701, as shown in FIG. Figure 5 As shown in (b), at this time, the sampling tube 2 slides to the second position due to its own gravity, and then the sealing plate 4 rotates to achieve sealing.

[0047] As a second preferred embodiment, the sampling device is further provided with a rotating rod 7 and a traction rope above the sampling tube 2, and 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 respectively connected to the top cover 9 and the rotating rod 7. In the first position, the traction rope is wound around the rotating rod 7, and the lower end of the sampling tube 2 is opened for sampling; when the rotating rod 7 is controlled to rotate so that the traction rope is unwound, the sampling tube 2 slides to the second position under the action of its own gravity, and then the sealing plate 4 rotates to achieve sealing.

[0048] Embodiment 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 to a first position relative to the connecting rod assembly, and the sealing plate 4 rotates to a first notch driven by the connecting rod assembly, and the bottom opening of the sampling tube 2 is opened;

[0051] Step 2: inserting the soil sampling device into the sampling object, so that the sampling object enters the sampling tube 2 for sampling;

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

[0053] Step 4: Control the rotating rod 7 to rotate, so that the sampling tube 2 slides to the second position relative to the connecting rod assembly due to its own gravity, and the sealing plate 4 is driven by the connecting rod assembly to rotate into the interior of the sampling tube 2, and the bottom opening of the sampling tube 2 is closed;

[0054] Step 5: Retract the soil sampling device and complete the sampling.

[0055] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

Claims

1. A soil sampling device that is easy to seal, characterized in that: The invention comprises a sampling tube (2) and a sealing mechanism, wherein the sealing mechanism comprises 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) 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-shaped plate, the opposite sides of the sealing plate (4) are respectively 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), and the sampling tube (2) is relatively The connecting rod assembly has a first position located at the top and a second position located at the bottom. 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) 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.

2. The soil sampling device that is easy to seal as claimed in claim 1, characterized in that: The connecting rod assembly comprises a sliding connecting rod (1) and a rotating connecting rod (3); the lower end of the sliding connecting rod (1) and the upper end of the rotating connecting rod (3) are rotatably connected, and the lower end of the rotating connecting rod (3) and the lower end of the sealing plate (4) are rotatably connected; the opposite sides of the sealing plate (4) are respectively rotatably connected to the sampling tube (2) on the inner side of the sampling tube (2); the two rotatably connected 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 connecting the two rotatably connected positions.

3. The soil sampling device that is easy to seal as claimed in claim 2, characterized in that: The connecting line between the two rotational connection positions intersects with the central axis of the sampling tube (2), and the rotation plane of the rotating connecting rod (3) also passes through the central axis of the sampling tube (2).

4. The soil sampling device that is easy to seal as claimed in claim 3, characterized in that: In the second position, the projection area of ​​the sealing plate (4) in 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 that is easy to seal as claimed in claim 1, characterized in that: 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 that is easy to seal as claimed in claim 5, characterized in that: 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 in the same plane.

7. The soil sampling device that is easy to seal as claimed in claims 1 to 6, characterized in that: 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 via the top cross bar (5); the sampling tube (2) is provided with limiting holes (901) on the corresponding two sides, respectively; the sliding connecting rod (1) and the guide rod (6) respectively pass through the corresponding limiting holes (901).

8. The soil sampling device that is easy to seal as claimed in claim 7, characterized in that: 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 limiting holes (901) on the corresponding two 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).

9. The soil sampling device that is easy to seal as claimed in claim 8, characterized in that: The soil sampling device is also provided with a rotating rod (7) and a bayonet 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) is provided with a snap-fit ​​rod section (701). The cross-sectional width of the snap-fit ​​rod section (701) is smaller than the cross-sectional length of the snap-fit ​​rod section (701). The bayonet collar (8) is fixedly connected to the upper end of the sampling tube (2). The upper end of the bayonet collar (8) is provided with a A bayonet (801) having an opening between the major diameter and the wide diameter of the cross section of the locking rod segment (701); in the first position, the major diameter of the cross section of the locking rod segment (701) faces the bayonet (801), and the bayonet collar (8) is sleeved on the locking rod segment (701); in the second position, the wide diameter of the cross section of the locking rod segment (701) faces the bayonet (801), and the bayonet collar (8) is detached from the locking rod segment (701).

10. The sampling method of the soil sampling device that is easy to seal according to any one of claims 1 to 9, characterized in that: The main steps are as follows: Step 1: the sampling tube (2) slides relative to the connecting rod assembly to a first position, the sealing plate (4) is driven by the connecting rod assembly to rotate to a first notch, and the bottom opening of the sampling tube (2) is opened; Step 2: inserting the soil sampling device into the sampling object so that the sampling object enters the sampling tube (2) for sampling; Step 3: After the sampling is completed, the soil sampling device is lifted up to expose the sampling surface; Step 4: the sampling tube (2) slides relative to the connecting rod assembly to a second position, the sealing plate (4) is driven by the connecting rod assembly to rotate into the interior of the sampling tube (2), and the bottom opening of the sampling tube (2) is closed; Step 5: Retract the soil sampling device and complete the sampling.

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