A lightweight soil sampling device

Abstract

This utility model relates to a lightweight soil sampling device, comprising: a soil sampling cylinder, a connecting rod, a guide rod, and a counterweight rod; the soil sampling cylinder is detachably connected to the first end of the connecting rod, the guide rod is movably sleeved on the second end of the connecting rod, a limiting structure is provided between the guide rod and the connecting rod, and the counterweight rod is detachably connected to the end of the guide rod away from the soil sampling cylinder; an air inlet is provided on the end of the soil sampling cylinder facing the connecting rod. This lightweight soil sampling device is convenient to use, simple and reliable in operation, and all parts are detachable, avoiding transportation inconvenience caused by its long overall length. The air inlet on the soil sampling cylinder allows the soil in the cylinder to be gradually extracted under air pressure, saving time and effort, significantly improving operational efficiency, ensuring soil integrity, and resulting in better sampling results.

Description

Technical Field

[0001] This utility model relates to the field of soil sampling equipment for geological exploration, and in particular to a lightweight soil sampling device. Background Technology

[0002] Geological exploration is an investigation and research activity that uses various means and methods to explore and detect geology, determine suitable bearing strata, determine the foundation type based on the bearing capacity of the bearing strata, and calculate foundation parameters. It is a survey and research activity that discovers industrially significant mineral deposits during mineral prospecting, provides mineral reserves and geological data needed for mine construction design to ascertain the quality and quantity of minerals and the technical conditions for mining and utilization, and investigates and studies the geological conditions such as rocks, strata, structures, minerals, hydrology, and landforms in a certain area. In geological exploration, it is necessary to use soil sampling equipment to sample and test the soil in the exploration area.

[0003] Common soil sampling devices include machine-driven and manual methods. Some manual devices use a rod to repeatedly hammer a sampling cylinder, gradually inserting it into the soil until it is full. Removing the soil requires repeatedly pulling the rod to fling the soil out using inertia. The problems with this type of device are that soil removal is time-consuming and labor-intensive, requiring constant manual operation of the rod, resulting in low efficiency. Furthermore, because the soil detaches from the device due to inertia, it is prone to scattering, leading to incomplete samples and sampling failure. Utility Model Content

[0004] Therefore, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a lightweight soil sampling device.

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

[0006] A lightweight soil sampling device, comprising:

[0007] Soil sampling cylinder, connecting rod, guide rod, and counterweight rod;

[0008] The soil sampling cylinder is detachably connected to the first end of the connecting rod. The guide rod is hollow inside and is movably sleeved on the second end of the connecting rod. The guide rod can reciprocate along the axial direction of the connecting rod. A limit structure is provided between the guide rod and the connecting rod to prevent the guide rod from detaching from the connecting rod in a direction away from the soil sampling cylinder. The counterweight rod is detachably connected to the end of the guide rod away from the soil sampling cylinder.

[0009] The soil sampling cylinder has an annular component fixedly connected to its opening. The outer diameter of the annular component is larger than the outer diameter of the soil sampling cylinder, and the inner diameter of the annular component is larger than the inner diameter of the soil sampling cylinder. An air inlet is provided on one end of the soil sampling cylinder facing the connecting rod, and the air inlet is connected to the interior of the soil sampling cylinder.

[0010] In one embodiment, the guide rod is provided with a plurality of buffer columns for impacting the soil sampling cylinder at one end.

[0011] In one embodiment, a plurality of the buffer posts are evenly arranged circumferentially along the guide rod, and the buffer posts extend axially along the guide rod.

[0012] In one embodiment, the inner diameter of the soil sampling cylinder gradually increases along the axial direction from the second end of the connecting rod to the first end of the connecting rod.

[0013] In one embodiment, the limiting structure includes a limiting ring and a limiting protrusion. The limiting ring is disposed on the guide rod near one end of the soil sampling cylinder, and the limiting protrusion is disposed on the second end of the connecting rod. The size of the limiting protrusion is larger than the inner diameter of the limiting ring, and the inner peripheral wall of the limiting ring is fitted to the outer peripheral wall of the connecting rod.

[0014] In one embodiment, the lightweight soil sampling device also includes an extension rod, which is detachably connected to the end of the counterweight rod or guide rod away from the soil sampling cylinder.

[0015] In one embodiment, the extension rod includes multiple rods and several universal joints. The multiple rods are arranged sequentially along their axial direction, and the ends of two adjacent rods are connected by one of the universal joints.

[0016] In one embodiment, the universal joint includes a first universal joint fork, a second universal joint fork, and a cross shaft. The first universal joint fork is connected to the second universal joint fork via the cross shaft. A movable fixing component is provided on the first universal joint fork. When the axes of the first universal joint fork and the second universal joint fork are parallel, the fixing component can be moved to a fixed position to fix the first universal joint fork and the second universal joint fork together.

[0017] In one embodiment, the fixing component is a fixing sleeve. When the fixing sleeve moves to a fixed position, the fixing sleeve covers the outside of the fork portion of the first universal joint fork and the fork portion of the second universal joint fork.

[0018] In one embodiment, the soil sampling cylinder is threadedly connected to the connecting rod, and the counterweight rod is threadedly connected to the guide rod.

[0019] As can be seen from the above configuration, the lightweight soil sampling device of this application is easy to use. Simply insert the sampling device into the hole and continuously operate the counterweight rod vertically to collect soil samples. No additional power device is required. The overall operation is simple and reliable, and all parts are detachable. When transportation or handling is required, each part can be disassembled to avoid inconvenience caused by the overall length. Therefore, the soil sampling device of this application has excellent portability. Furthermore, the soil sampling cylinder of this application is equipped with an air inlet. Air can be pumped into the soil sampling cylinder through the air inlet, and the soil in the sampling cylinder can be gradually extracted under air pressure. This not only saves time and effort, significantly improving operational efficiency, but also ensures the integrity of the soil, resulting in better sampling results.

[0020] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is an explosion diagram of the lightweight soil sampling device in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the lightweight soil sampling device in the embodiments of this application;

[0023] Figure 3 This is a partial schematic diagram of the guide rod engaging with the limiting structure in an embodiment of this application;

[0024] Figure 4 This is a partial schematic diagram of the guide rod hammer striking the soil sampling cylinder in an embodiment of this application;

[0025] Figure 5 This is an exploded view of the guide rod, connecting rod, and soil sampling cylinder in the embodiments of this application;

[0026] Figure 6 This is a partial schematic diagram of the extension rod in this embodiment of the application when two adjacent rods are parallel (excluding the fixing components);

[0027] Figure 7 This is a partial schematic diagram of the extension rod in an embodiment of this application when two adjacent rods are tilted (with the fixing components removed);

[0028] Figure 8 This is a partial schematic diagram of the fixed component in its initial position in an embodiment of this application;

[0029] Figure 9 This is a partial schematic diagram of the fixed component in a fixed position in an embodiment of this application;

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Soil sampling cylinder; 11. Air inlet; 2. Connecting rod; 3. Guide rod; 31. Buffer column; 4. Counterweight rod; 5. Extension rod; 51. Rod body; 52. Universal joint; 521. First universal joint fork; 522. Second universal joint fork; 5201. Fork part; 5202. Shaft part; 5203. Positioning ring; 523. Cross shaft; 53. Fixing component; 23. Limiting structure; 231. Limiting ring; 232. Limiting protrusion. Detailed Implementation

[0032] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this utility model.

[0034] Please see Figures 1 to 5 This embodiment provides a lightweight soil sampling device, which includes: a soil sampling cylinder 1, a connecting rod 2, a guide rod 3, and a counterweight rod 4 arranged sequentially from bottom to top.

[0035] The soil sampling cylinder 1 is detachably connected to the first end (lower end) of the connecting rod 2. The function of the soil sampling cylinder 1 is to insert it into the soil to collect samples. The soil sampling cylinder 1 has a cylindrical structure, which ensures the integrity of the sampled soil and prevents it from easily falling off. Specifically, the cylindrical structure is open at one end (the end away from the connecting rod 2) and closed at the other end (the end facing the connecting rod 2). The soil sampling cylinder 1 and the connecting rod 2 can be detachably connected by a threaded connection, facilitating the replacement of the soil sampling cylinder 1. An air inlet 11 is provided on the end of the soil sampling cylinder 1 facing the connecting rod 2. The air inlet 11 connects to the interior of the soil sampling cylinder 1. By providing the air inlet 11, when the soil sampling cylinder 1 is filled with soil, the air pipe of an external air pump can be inserted into the air inlet 11. By pumping air into the soil sampling cylinder 1, the soil in the soil sampling cylinder 1 can be gradually extracted under air pressure. An annular component 12 is fixedly connected to the opening 101 of the soil sampling cylinder 1. The outer diameter of the annular component 12 is larger than the outer diameter of the soil sampling cylinder 1, and the inner diameter of the annular component 12 is larger than the inner diameter of the soil sampling cylinder 1. By setting the annular component 12 at the opening of the soil sampling cylinder 1, and with both the inner and outer dimensions of the annular component 12 being larger than the soil sampling cylinder 1, the annular component 12 contacts the soil first when the soil sampling cylinder 1 is inserted into the soil. Furthermore, since both the inner and outer dimensions of the annular component 12 are larger than the soil sampling cylinder 1, a stepped structure is formed between the annular component 1 and the opening of the soil sampling cylinder 1, which reduces the friction between the soil sampling cylinder 1 and the soil when it is inserted into the soil, thereby reducing damage to the soil sampling cylinder 1 and improving its overall durability.

[0036] The guide rod 3 is hollow inside and is movably sleeved on the second end (upper end) of the connecting rod 2. The guide rod 3 can reciprocate along the axial direction of the connecting rod 2. The guide rod 3 can cooperate with the outer peripheral wall of the connecting rod 2 to move along the axial direction of the connecting rod 2 to guide the movement of the counterweight rod 4. The guide rod 3 can be moved to the position to impact the soil sampling cylinder 1. A limiting structure 23 is provided between the guide rod 3 and the connecting rod 2. The limiting structure 23 is used to prevent the guide rod 3 from disengaging from the connecting rod 2 in a direction away from the soil sampling cylinder 1 (i.e., upward). The movement of the guide rod 3 towards the soil sampling cylinder 1 is not restricted by the limiting structure 23. During disassembly, the soil sampling cylinder 1 can be disassembled from the connecting rod 2, and then the guide rod 3 can be slid out towards the soil sampling cylinder 1 (or the connecting rod 2 can be disengaged from the guide rod 3 upward).

[0037] The counterweight rod 4 is detachably connected to the guide rod 3 at the end furthest from the soil sampling cylinder 1. It is understood that the counterweight rod 4 can reciprocate along the axial direction of the connecting rod 2, following the guide rod 3. The counterweight rod 4 has a relatively large weight, which increases the impact force, making it easier and less strenuous for the user to operate. In this embodiment, the counterweight rod 4 and the guide rod 3 are connected by a thread, simplifying assembly and disassembly.

[0038] One method of using the portable soil sampling device of this application is as follows:

[0039] like Figure 3-4 As shown, at the sampling location, the soil sampling tube 1 of the soil sampling device is inserted into the soil with the ground facing upwards. Then, the counterweight rod 4 is held and repeatedly operated vertically. When the counterweight rod 4 is moved downwards, the guide rod 3 also moves downwards, causing the end of the guide rod 3 to strike the end of the soil sampling tube 1, pushing the soil sampling tube 1 downwards into the soil. When the counterweight rod 4 is moved upwards, the guide rod 3 also moves upwards, moving away from the soil sampling tube 1 to store gravitational potential energy for the next strike. Due to the presence of the counterweight rod 4, its weight is relatively large, so more gravitational potential energy can be stored when moving it upwards, thus requiring less effort from the user when moving it downwards. The distance of the guide rod 3 from the soil sampling tube 1 is limited by the limiting structure 23, so the guide rod 3 will not detach from the connecting rod 2. As can be seen from the above, by continuously operating the counterweight rod 4 and the guide rod 3, the user can repeatedly hammer (impact) the soil sampling cylinder 1, thereby causing the soil sampling cylinder 1 to continuously penetrate into the soil and take soil samples. At this time, a hole is formed on the ground by the hammering of the soil sampling cylinder 1.

[0040] After the soil sampling cylinder 1 is filled with soil, the soil sampling device can be pulled out from the borehole. By inserting the air pipe of an external air pump into the air inlet 11 of the soil sampling cylinder 1, and pumping air into the soil sampling cylinder 1, the soil in the soil sampling cylinder 1 can be gradually extracted from the soil sampling cylinder 1 under the action of air pressure, thereby obtaining complete soil and completing the soil collection at that borehole depth. Of course, the soil sampling cylinder 1 filled with soil can also be completely removed from the connecting rod 2 and a new soil sampling cylinder 1 can be directly replaced. The disassembled soil sampling cylinder 1 can be sent to the testing site for testing.

[0041] After the soil in the soil sampling cylinder 1 is removed or a new soil sampling cylinder 1 is replaced, the soil sampling device can be inserted into the formed hole again to take soil samples again until the required sampling depth is reached.

[0042] The above-described method of use can achieve the effect of vertical drilling. Of course, it is understood that, depending on the actual situation, it can also be horizontal or inclined drilling. That is to say, when using it, the soil sampling tube 1 is aligned with the sampling position, and the counterweight rod 4 is operated horizontally or obliquely to achieve the same effect as the vertical drilling described above, and the soil is sampled.

[0043] As can be seen from the above configuration, the lightweight soil sampling device of this application is easy to use. Simply insert the sampling device into the hole and continuously operate the counterweight rod 4 vertically to achieve soil sampling. No other additional power device is required. The overall operation is simple and reliable, and all parts are detachable. When transportation or handling is required, each part can be disassembled to avoid inconvenience caused by the overall length. Therefore, the soil sampling device of this application has excellent portability. Furthermore, the soil sampling cylinder 1 of this application is provided with an air inlet 11. Air can be pumped into the soil sampling cylinder 1 through the air inlet 11, and the soil in the soil sampling cylinder 1 can be gradually extracted from the soil sampling cylinder 1 under the action of air pressure. This not only saves time and effort and significantly improves operational efficiency, but also ensures the integrity of the soil and results in better sampling.

[0044] The soil sampling device of this application can perform core sampling and sampling. The diameter of the soil sampling cylinder 1 is 6-10cm, which is easy to carry. The exploration depth can reach 15-20 meters and can explore to moderately weathered blocky rock layers. Compared with the existing technology, it is simple to operate, does not require power or water, and is portable and reliable.

[0045] like Figure 3-5 As shown, in order to reduce the impact pressure of the guide rod 3 on the soil sampling cylinder 1 and prevent the soil sampling cylinder 1 from being damaged, preferably, the end of the guide rod 3 facing the soil sampling cylinder 1 is provided with multiple buffer pillars 31 for impacting the soil sampling cylinder 1. The contact area between the multiple buffer pillars 31 and the soil sampling cylinder 1 is larger than the contact area between the end of the guide rod 3 and the soil sampling cylinder 1, thus it can reduce the impact pressure, thereby reducing damage to the soil sampling cylinder 1 and improving its service life.

[0046] Specifically, in this embodiment, a plurality of buffer posts 31 are evenly arranged along the circumference of the guide rod 3, and the buffer posts 31 extend along the axial direction of the guide rod 3.

[0047] like Figure 5 As shown, preferably, the inner diameter of the soil sampling cylinder 1 gradually increases along the axial direction from the second end of the connecting rod 2 to the first end of the connecting rod 2 (i.e., from bottom to top), making it easier for the soil sampling cylinder 1 to be inserted into the soil.

[0048] In this embodiment, the limiting structure 23 can prevent the guide rod 3 from detaching from the connecting rod 2. Its arrangement can be varied. Preferably, in this embodiment, the limiting structure 23 includes a limiting ring 231 and a limiting protrusion 232. The limiting ring 231 is located on the guide rod 3 near the end of the soil sampling cylinder 1, and the limiting protrusion 232 is located at the second end of the connecting rod 2. The size of the limiting protrusion 232 is larger than the inner diameter of the limiting ring 231, and the inner circumferential wall of the limiting ring 231 fits into the outer circumferential wall of the connecting rod 2. With this arrangement, the movement of the guide rod 3 away from the soil sampling cylinder 1 is limited by the limiting protrusion 232, thereby preventing the guide rod 3 from detaching from the connecting rod 2. The inner circumferential wall of the limiting ring 231 fits into the outer circumferential wall of the connecting rod 2, allowing the guide rod 3 to move axially along the connecting rod 2, reducing movement deviation. In this embodiment, the limiting protrusion 232 is a cylindrical structure located at the end of the connecting rod 2.

[0049] like Figure 1-2 As shown, preferably, the lightweight soil sampling device in this embodiment further includes an extension rod 5, which is detachably connected to the end of the counterweight rod or guide rod away from the soil sampling cylinder. The extension rod allows for adjustments to the exploration depth.

[0050] The length of extension rod 5 can be designed according to actual needs to meet the exploration depth. Multiple extension rods 5 can also be used. However, using multiple extension rods 5 may make disassembly and assembly more cumbersome, thus reducing efficiency. Therefore, as... Figure 1-2 As shown in Figures 6-9, preferably, in this embodiment, the extension rod 5 includes multiple rods 51 and several universal joints 52. The multiple rods 51 are arranged sequentially along their axial direction, and the ends of adjacent rods 51 are connected by a universal joint 52. With this configuration, the extension rod 5 allows for the selection of an appropriate number of rods 51 according to usage requirements, and the connection between adjacent rods 51 using universal joints 52. This allows adjacent rods 51 to rotate relative to each other in multiple directions. When the extension rod 5 needs to be stored, the multiple rods 51 can be folded together to complete storage, reducing the total length and facilitating carrying and transport. Theoretically, there is no upper limit to the number of rods 51; they can be increased or decreased according to the actual usage scenario. The extension rod 5 is threadedly connected to the end of the counterweight rod 4 through the end of its first rod 51 furthest from the universal joint 52. Disassembly can be achieved by simply screwing on the counterweight rod 4. It should be noted that, for ease of handling and use, the extension rod 5 connected to the counterweight rod 4 is heavier than the other rods. In other words, the other rods are relatively lighter, while the rod connected to the counterweight rod is relatively heavier. This makes it easier to operate and saves effort when handling the rod.

[0051] The universal joint 52 can adopt a structure found in existing technology. For example, the universal joint 52 includes a first universal joint fork 521, a second universal joint fork 522, and a cross shaft 523. The first universal joint fork 521 is connected to the second universal joint fork 522 via the cross shaft 523, thereby enabling rotation of the first universal joint fork 521 and the second universal joint fork 522 in any direction. Figure 6-9 As shown, both the first universal joint fork 521 and the second universal joint fork 522 have a shaft portion 5202 and a fork portion 5201. The fork portion 5201 is disposed on one side of the shaft portion 5202. The fork portion 5201 of the first universal joint fork 521 is connected to two opposite shafts of the cross shaft 523, and the fork portion 5201 of the second universal joint fork 522 is connected to the other two opposite shafts of the cross shaft 523, thereby realizing universal rotation. The shaft portion 5202 of the first universal joint fork 521 is threadedly connected to the end of a rod body 51, and the shaft portion 5202 of the second universal joint fork 522 is threadedly connected to the end of another rod body 51.

[0052] To avoid inconvenience caused by relative movement between adjacent rods 51 during operation, preferably, in this embodiment, a movable fixing component 53 is provided on the first universal joint fork 521. When the axes of the first universal joint fork 521 and the second universal joint fork 522 are parallel, the fixing component 53 can be moved to a fixed position to fix the first universal joint fork 521 and the second universal joint fork 522 together. With this arrangement, when the soil sampling device is inserted into the hole to be sampled, as the depth increases, the rods 51 enter the hole one by one. At this time, the fixing component 53 corresponding to the universal head that is about to enter the hole is gradually moved to a fixed position, so that the universal head is fixed and the two rods 51 connected to the universal head are relatively fixed, which makes it more convenient for the user to use. Understandably, when the soil-collecting device needs to be removed, the rods 51 are pulled out one by one from the inlet. At this time, the corresponding fixing parts 53 on the universal head that come out of the inlet are gradually moved to the initial position. In this way, the two rods 51 connected to the universal head can rotate relative to each other, making it convenient to store.

[0053] The fixing component 53 can be configured in various ways. Preferably, in this embodiment, the fixing component 53 is a fixing sleeve. When the fixing sleeve moves to the fixed position, it covers the outside of the fork portion 5201 of the first universal joint fork 521 and the fork portion 5201 of the second universal joint fork 522. Figure 9 As shown, this restricts the rotation of the first universal joint fork 521 and the second universal joint fork 522. Figure 8As shown, in its initial position, the fixing sleeve is fitted onto the shaft portion 5202 of the first universal joint fork 521, allowing the first universal joint fork 521 and the second universal joint fork 522 to rotate relative to each other. When the soil-removing device is in use, the first universal joint fork 521 is positioned above the second universal joint fork 522. The fixing sleeve can naturally fall to a fixed position under gravity, thus covering the outer sides of the fork portions 5201 of the first universal joint fork 521 and the fork portions 5201 of the second universal joint fork 522, securing them in place. The user manually moves the fixing sleeve to its initial position, allowing the first universal joint fork 521 and the second universal joint fork 522 to rotate relative to each other. It is understood that a positioning ring 5203 is provided on the shaft portion 5202 of the second universal joint fork 522. When the fixing sleeve moves downwards to the fixed position, it is secured by the positioning ring 5203, preventing excessive displacement. With the fixed sleeve set as described above, it is easy to use. When the user adjusts the two adjacent rods 51 to be in a parallel state, the axes of the first universal joint fork 521 and the second universal joint fork 522 connecting the two rods 51 are parallel. At this time, the fixed sleeve can slide down to the fixed position under the action of gravity, so that the first universal joint fork 521 and the second universal joint fork 522 are fixed, thereby fixing the two rods 51 relative to each other, which is convenient for the user to operate.

[0054] Preferably, the annular component 12 is made of manganese alloy steel. Manganese alloy steel is a high-strength steel, mainly used in harsh working conditions such as impact, extrusion, and material abrasion. Therefore, the annular component 12 made of this material is durable and not easily damaged.

[0055] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A portable soil sampling device, characterized by, include: Soil sampling cylinder, connecting rod, guide rod, and counterweight rod; The soil sampling cylinder is detachably connected to the first end of the connecting rod. The guide rod is hollow inside and is movably sleeved on the second end of the connecting rod. The guide rod can reciprocate along the axial direction of the connecting rod. A limit structure is provided between the guide rod and the connecting rod to prevent the guide rod from detaching from the connecting rod in a direction away from the soil sampling cylinder. The counterweight rod is detachably connected to the end of the guide rod away from the soil sampling cylinder. The soil sampling cylinder has an annular component fixedly connected to its opening. The outer diameter of the annular component is larger than the outer diameter of the soil sampling cylinder, and the inner diameter of the annular component is larger than the inner diameter of the soil sampling cylinder. An air inlet is provided on one end of the soil sampling cylinder facing the connecting rod, and the air inlet is connected to the interior of the soil sampling cylinder.

2. The lightweight soil sampling device according to claim 1, characterized in that: The guide rod is equipped with multiple buffer columns at one end facing the soil sampling cylinder for impacting the soil sampling cylinder.

3. The lightweight soil sampling device according to claim 2, characterized in that: The plurality of buffer posts are evenly arranged circumferentially along the guide rod, and the buffer posts extend axially along the guide rod.

4. The lightweight soil sampling device according to claim 1, characterized in that: The inner diameter of the soil sampling cylinder gradually increases along the axial direction from the second end of the connecting rod to the first end of the connecting rod.

5. The lightweight soil sampling device according to claim 1, characterized in that: The limiting structure includes a limiting ring and a limiting protrusion. The limiting ring is disposed on the guide rod near one end of the soil sampling cylinder, and the limiting protrusion is disposed on the second end of the connecting rod. The size of the limiting protrusion is larger than the inner diameter of the limiting ring, and the inner peripheral wall of the limiting ring fits into the outer peripheral wall of the connecting rod.

6. The lightweight soil sampling device according to any one of claims 1-5, characterized in that: It also includes an extension rod, which is detachably connected to the end of the counterweight rod or guide rod away from the soil sampling cylinder.

7. The lightweight soil sampling device according to claim 6, characterized in that: The extension rod includes multiple rods and several universal joints. The multiple rods are arranged sequentially along their axial direction, and the ends of two adjacent rods are connected by a universal joint.

8. The lightweight soil sampling device according to claim 7, characterized in that: The universal joint includes a first universal joint fork, a second universal joint fork, and a cross shaft. The first universal joint fork is connected to the second universal joint fork via the cross shaft. The first universal joint fork is provided with a movable fixing component. When the axes of the first universal joint fork and the second universal joint fork are parallel, the fixing component can be moved to a fixed position to fix the first universal joint fork and the second universal joint fork together.

9. The lightweight soil sampling device according to claim 8, characterized in that: The fixing component is a fixing sleeve. When the fixing sleeve moves to a fixed position, the fixing sleeve covers the outside of the fork of the first universal joint fork and the fork of the second universal joint fork.

10. The portable soil sampling device of claim 1, wherein: the soil sampling barrel is threadably connected to the connecting rod, and the counterweight rod is threadably connected to the guide rod.

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