Soil solution sampling device for forestry exploration

Abstract

The invention relates to the technical field of geological exploration, in particular to a soil solution sampling device for forestry exploration. Comprising a drilling frame, the drilling frame is composed of a drilling rod, a plurality of connecting pieces and a conical block, the drilling rod is fixedly connected with the conical block through the connecting pieces, a control module is arranged at the top of the drilling frame, a sliding rod is rotatably and slidably connected to the interior of the drilling frame, the sliding rod is fixedly connected with a fixing cylinder, and the fixing cylinder is fixedly connected with the drilling frame. A sampling barrel is slidably connected into the fixing barrel, a driving module is arranged in the fixing barrel, a plurality of sampling holes are formed in the sampling barrel, and a positioning assembly is arranged on the drilling frame. The soil layer is vertically drilled through the drilling frame, and then the fixing cylinder extends into the soil layer from the side direction of the soil layer to complete sampling of a soil solution, so that the probability that the solution in the upper soil layer flows downwards under the action of gravity and is mixed with the soil solution in the sampled soil layer is reduced, and the sampling accuracy of the soil layer solution is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of geological exploration, and particularly relates to a soil solution sampling device for forestry exploration. Background Art

[0002] Forestry exploration is an important basic work for carrying out forest resource surveys, ecological assessments, and sustainable management. During forestry exploration, the detection of soil solution not only helps to understand the nutrient status and chemical properties of the soil, but also provides a scientific basis for afforestation, vegetation restoration, pollution control, plant health monitoring, and ecosystem research. By comprehensively analyzing various components such as various ions, organic matter, and trace elements in the soil solution, the soil fertility level can be more accurately evaluated, a scientific and reasonable forest management strategy can be formulated, the high-quality development of forest resources can be promoted, and it can play an active role in coping with climate change, protecting biodiversity, etc.

[0003] Currently, the commonly used soil solution sampling device usually adopts the method of first drilling a vertical hole and then sampling from the bottom of the hole during operation. However, in the actual operation process, when the soil layer has a high water content, the solution in the upper soil will seep downward along the inner wall of the hole and mix with the bottom soil solution, resulting in changes in the composition and concentration of the collected sample. This phenomenon not only reduces the representativeness of the sample, but also affects the accuracy of the subsequent detection data, thereby misleading the soil quality assessment and forest land management decision-making. Summary of the Invention

[0004] In order to overcome the disadvantages mentioned in the above background art, the present invention provides a soil solution sampling device for forestry exploration.

[0005] Technical Solution: A soil solution sampling device for forestry exploration includes a drilling frame, the drilling frame is composed of a drill rod, a plurality of connecting pieces, and a cone block. The drill rod is fixedly connected to the cone block through the plurality of connecting pieces. A control module for driving itself to rotate is provided at the top of the drilling frame. A sliding rod is rotatably and slidably connected inside the drilling frame. The sliding rod is fixedly connected to a fixed cylinder. The central axis of the sliding rod intersects and is perpendicular to the central axis of the fixed cylinder. A sampling cylinder is slidably connected inside the fixed cylinder. A driving module for driving the sampling cylinder to move is provided inside the fixed cylinder. The sampling cylinder is provided with a plurality of sampling holes. The sampling cylinder is fixedly connected to a negative pressure pipe. The negative pressure pipe is communicated with the plurality of sampling holes through the sampling cylinder. A positioning component for positioning the sampling position of the sampling cylinder is provided on the drilling frame.

[0006] Further explanation, a filter cloth for filtering external soil is provided outside the sampling cylinder, and the filter cloth blocks the plurality of sampling holes.

[0007] Further explanation: The positioning component includes a positioning ring, which is fixedly connected to the drilling rig. The positioning ring is provided with a groove. The sliding rod is fixedly connected with a positioning block. When the positioning block is located in the groove on the positioning ring, the sampling cylinder is positioned.

[0008] Further explanation: The connecting piece is misaligned with the straight line where the center point of the groove on the positioning ring and the center point of its own body are located, so as to position the sampling position of the sampling cylinder for the soil solution.

[0009] Further explanation: The sampling cylinder is detachably connected with a protective shell. The protective shell is provided with corresponding holes with the same number as the sampling holes, and the sampling holes are aligned with the corresponding holes one by one. There is a gap between the protective shell and the sampling cylinder, and the filter cloth is located in the gap between the protective shell and the sampling cylinder.

[0010] Further explanation: A storage cylinder is fixedly connected inside the sampling cylinder. The storage cylinder is communicated with the gap between the protective shell and the sampling cylinder. A sliding ring is slidably connected to the protective shell and the sampling cylinder together. An electric push rod is fixedly connected inside the sampling cylinder. The telescopic end of the electric push rod is hermetically slidably connected to the storage cylinder. Both ends of the filter cloth are fixedly connected to the sliding ring and the telescopic end of the electric push rod respectively.

[0011] Further explanation: Sealing rings are fixedly connected to both the protective shell and the sampling cylinder. The two sealing rings form a clamping seal for the filter cloth.

[0012] Further explanation: A plugging cylinder is slidably connected to the outside of the protective shell. The plugging cylinder is used to plug all the corresponding holes on the protective shell. A first elastic member is arranged between the plugging cylinder and the sampling cylinder.

[0013] Further explanation: A positioning rod is slidably connected to the plugging cylinder. The positioning rod is used to connect the protective shell and the plugging cylinder. A second elastic member is arranged between the positioning rod and the plugging cylinder.

[0014] Further explanation: The fixed cylinder is fixedly connected with an extrusion block. The extrusion block is used to extrude and limit the positioning rod, so that the protective shell and the plugging cylinder are separated and slide relative to each other.

[0015] The beneficial effects are as follows: 1. The present invention vertically drills holes in the soil layer through the drilling rig, and then the fixed cylinder penetrates into the soil layer laterally from the side to complete the sampling of the soil solution, thereby reducing the probability of the solution in the upper soil layer flowing downward due to gravity and mixing with the soil solution in the sampled soil layer, and improving the accuracy of the soil layer solution sampling.

[0016] 2. Wrap the filter cloth with a protective shell and a sampling tube to reduce the contact area between the filter cloth and the soil layer, thereby reducing the probability that the filter cloth is scratched by the soil layer and cannot prevent the external soil from entering the negative pressure pipe.

[0017] 3. Use the electric push rod to regularly pull the filter cloth into the storage cylinder to change the position of the filter cloth filtering the solution, continuously change the filtering position of the filter cloth on the solution, reduce the probability of filter cloth clogging, and ensure the rate of soil solution sampling.

[0018] 4. Use the blocking tube to block several corresponding holes on the protective shell in advance. After the sampling tube penetrates into the soil layer, remove the blocking tube from the corresponding holes to prevent the soil solution in other positions from adhering to the filter cloth and affecting the final sampling results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the positioning ring and the positioning block of the present invention; Figure 3 It is a schematic cross-sectional view of the three-dimensional structure of the fixing cylinder of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the blocking cylinder and the driving module of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the sampling tube of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the protective housing and the sealing ring of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of the storage cylinder of the present invention; Figure 8 Schematic diagram of the three-dimensional structure of the sliding ring and the electric push rod of the present invention; Figure 9 It is a schematic diagram of the three-dimensional structure of the locking rod and the extrusion block of the present invention.

[0020] Markings in the accompanying drawings: 1: drilling frame, 101: drill rod, 102: connecting piece, 103: cone block, 2: control module, 3: sliding rod, 4: fixing cylinder, 5: sampling cylinder, 6: driving module, 7: sampling hole, 8: negative pressure tube, 9: filter cloth, 201: positioning ring, 202: positioning block, 301: protective shell, 302: corresponding hole, 303: storage cylinder, 304: sliding ring, 305: electric push rod, 306: sealing ring, 401: blocking cylinder, 402: first elastic part, 403: positioning rod, 404: second elastic part, 405: extrusion block. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present 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 only used to explain the present invention and are not used to limit the present invention.

[0022] Embodiment 1

[0023] This embodiment discloses a soil solution sampling device for forestry exploration, which is mainly used to improve the accuracy of soil solution sampling.

[0024] As Figures 1 - 6 shown, it includes a drilling rig 1, which is composed of a drill pipe 101, two connectors 102 and a cone 103. The drill pipe 101 is fixedly connected to the cone 103 at the bottom through the two connectors 102. The cone 103 facilitates penetration into the soil. A control module 2 for driving its own rotation is provided at the top of the drilling rig 1. A sliding rod 3 is rotatably and slidably connected inside the drilling rig 1. The sliding rod 3 has a T-shaped structure. The sliding rod 3 is fixedly connected to a fixed cylinder 4. The central axis of the sliding rod 3 intersects and is perpendicular to the central axis of the fixed cylinder 4. A sampling cylinder 5 is slidably connected inside the fixed cylinder 4. The length of the sampling cylinder 5 is less than the maximum diameter of the drilling rig 1. A through hole for the sampling cylinder 5 to protrude is provided on the left side of the fixed cylinder 4. A driving module 6 for driving the movement of the sampling cylinder 5 is provided inside the fixed cylinder 4. The driving module 6 is composed of a servo motor and a lead screw. The servo motor is fixedly connected inside the sampling cylinder 5. The output shaft of the servo motor is fixedly connected to the lead screw. The lead screw is threadedly connected to the sampling cylinder 5. The sampling cylinder 5 is provided with a number of sampling holes 7. The sampling holes 7 are located in the left part of the sampling cylinder 5, which is convenient for extracting the soil solution deep in the side wall of the soil layer and improving the accuracy of soil solution extraction. The sampling cylinder 5 is fixedly connected to a negative pressure pipe 8. The negative pressure pipe 8 is communicated with a number of sampling holes 7 through the sampling cylinder 5. The negative pressure pipe 8 is connected to an external negative pressure pump to provide the extraction force for extracting the soil solution. A channel (not shown in the figure) is provided inside the sliding rod 3. The negative pressure pipe 8 can be connected to an external negative pressure pump along the channel inside the sliding rod 3. A positioning component for positioning the sampling position of the sampling cylinder 5 is provided on the drilling rig 1. A filter cloth 9 for filtering external soil quality is provided outside the sampling cylinder 5. When the filter cloth 9 is normally flattened, it is an annular cloth. The filter cloth 9 blocks a number of sampling holes 7. The filter cloth 9 is made of polyester fiber material, which has strong wear resistance and low cost.

[0025] As Figure 2As shown in the figure, the positioning component includes a positioning ring 201. The positioning ring 201 is fixedly connected to the drilling rig 1. The positioning ring 201 is provided with a groove. Both connecting pieces 102 are misaligned with the straight line where the center point of the groove on the positioning ring 201 and the center point of its body are located, for positioning the sampling position of the sampling cylinder 5 for the soil solution, preventing the sampling cylinder 5 from colliding with the connecting piece 102 when the sampling cylinder 5 extends out of the fixed cylinder 4. The sliding rod 3 is fixedly connected with a positioning block 202. When the positioning block 202 is located in the groove on the positioning ring 201, the sampling cylinder 5 is positioned.

[0026] Working principle: When it is necessary to use this device to sample forest soil solution, the staff operates this device perpendicular to the ground and makes the drilling rig 1 start to rotate through the control module 2. The drilling rig 1 starts to rotate and penetrate into the ground. At the same time, the drilling rig 1 drives the sliding rod 3 to move downward synchronously. During the period when the drilling rig 1 rotates at a high speed and penetrates into the soil layer, and during the downward movement of the drilling rig 1, the staff always maintains the relative positions of the control module 2 and the sliding rod 3, so that the drilling rig 1 will not drive the sliding rod 3 to rotate synchronously. In this way, until the drilling rig 1 drives the fixed cylinder 4 to reach the sampling depth through the sliding rod 3, then the staff turns off the drilling rig 1, pulls up and rotates the sliding rod 3, so that the positioning block 202 on the sliding rod 3 moves synchronously, making the positioning block 202 fit against the lower side of the positioning ring 201 and finally enter the groove on it. At this moment, the extending position of the sampling cylinder 5 is misaligned with the connecting piece 102, avoiding the collision between the sampling cylinder 5 and the connecting piece 102.

[0027] After the position of the fixed cylinder 4 is positioned, the driving module 6 is turned on, so that the driving module 6 drives the sampling cylinder 5 to extend out of the fixed cylinder 4, making the sampling cylinder 5 penetrate from the side wall of the soil layer into its interior. In this way, until the driving module 6 pushes the sampling cylinder 5 to the limit state, at this time the sampling cylinder 5 completely extends out of the fixed cylinder 4 and penetrates into the side wall of the soil layer. Then the external negative pressure pump is turned on. Under the action of the negative pressure extraction force, the soil solution in the side wall soil layer is drawn by the extraction force and enters the negative pressure pipe 8 through several sampling holes 7, and finally is discharged to the outside to complete the sampling. During this period, the soil solution passes through the filter cloth 9, and the filter cloth 9 blocks the soil to the outside. In this way, until the soil solution sampling is completed, the soil layer is vertically drilled through the drilling rig 1, and then the fixed cylinder 4 penetrates into its interior from the side of the soil layer to complete the sampling of the soil solution, thereby reducing the probability of the solution in the upper soil layer flowing downward due to gravity and mixing with the soil solution in the sampled soil layer, and improving the accuracy of the soil layer solution sampling.

[0028] After the soil layer solution sampling is completed, turn off the external negative pressure pump, then the driving module 6 drives the sampling cylinder 5 to be retracted into the fixed cylinder 4, and the drilling rig 1 is pulled out, and this device is cleaned. When it is necessary to sample the soil layer solution again, repeat the above steps.

[0029] Embodiment 2

[0030] This embodiment discloses a soil solution sampling device for forestry exploration, which is further improved on the basis of Embodiment 1.

[0031] As Figures 3 - 5 shown, a protective housing 301 is detachably connected to the outside of the sampling cylinder 5 for disassembling the protective housing 301 and replacing the internal filter cloth 9. The left end of the protective housing 301 is in a conical structure, which is convenient for itself to be inserted into the soil layer. The protective housing 301 is provided with corresponding holes 302 having the same number as the sampling holes 7, and the sampling holes 7 and the corresponding holes 302 are aligned one by one. An annular gap is left between the protective housing 301 and the sampling cylinder 5, and the filter cloth 9 is located in the annular gap between the protective housing 301 and the sampling cylinder 5. It is used to allow the external soil solution to enter the negative pressure tube 8 through the corresponding holes 302, the filter cloth 9 and the sampling holes 7, and reduce the contact area between the filter cloth 9 and the soil layer through the protective housing 301, reducing the probability of the filter cloth 9 being scratched. A storage cylinder 303 is fixedly connected inside the sampling cylinder 5. The left part of the storage cylinder 303 is communicated with the annular gap between the protective housing 301 and the sampling cylinder 5. A sliding ring 304 is slidably connected to the protective housing 301 and the sampling cylinder 5 together. There is friction between the protective housing 301 and the sampling cylinder 5 and the sliding ring 304, which is used to ensure that the outer peripheral side of the filter cloth 9 is in a flattened state during the change of position. The sliding ring 304 is located in the annular gap between the protective housing 301 and the sampling cylinder 5. An electric push rod 305 is fixedly connected inside the sampling cylinder 5. The telescopic end of the electric push rod 305 is hermetically slidably connected to the storage cylinder 303. Initially, the telescopic end of the electric push rod 305 is located at the left end of the storage cylinder 303, and the blocked area on the filter cloth 9 can be stored and sealed in the storage cylinder 303. Both ends of the filter cloth 9 are fixedly connected to the sliding ring 304 and the telescopic end of the electric push rod 305 respectively. The telescopic end of the electric push rod 305 can pull the filter cloth 9 into the storage cylinder 303, and the filter cloth 9 will pull the sliding ring 304 to move synchronously, thereby changing the filtering position of the filter cloth 9 for the soil solution and ensuring the sampling rate of the soil solution. Sealing rings 306 are fixedly connected to both the protective housing 301 and the sampling cylinder 5. The two sealing rings 306 are located on the right side of the sampling holes 7 and the corresponding holes 302. The two sealing rings 306 form a clamping seal for the filter cloth 9 to block the external soil solution and prevent the soil solution from adhering to the filter cloth 9 in advance, affecting the flow area of the filter cloth 9.

[0032] Working principle: When the driving module 6 drives the sampling cylinder 5 to penetrate deep into the soil layer, the sampling cylinder 5 drives the protective housing 301 thereon to move synchronously, and the protective housing 301 is in direct contact with the soil layer. In this way, until the sampling cylinder 5 penetrates deep into the soil layer and stops moving, the external negative pressure pump is turned on to start extracting the solution in the soil layer. The soil solution enters the negative pressure pipe 8 through a number of corresponding holes 302, the filter cloth 9 and a number of sampling holes 7. The filter cloth 9 is wrapped by the protective housing 301 and the sampling cylinder 5, so that the protective housing 301 reduces the contact area between the soil layer and the filter cloth 9, reduces the probability of the filter cloth 9 being cut by the soil layer, and ensures the smooth extraction of the soil solution by the negative pressure pipe 8.

[0033] During the sampling of the soil solution, the filter cloth 9 filters the solution and blocks the external soil. There is a probability that the filter cloth 9 will become blocked, thereby reducing the sampling rate of the soil solution. Therefore, when extracting the solution in the soil layer under negative pressure, the electric push rod 305 is turned on, so that the telescopic end of the electric push rod 305 slides regularly inward along the storage cylinder 303 (the single sliding distance is the same as the length of the sampling hole 7, which is convenient for making full use of the filtering area of the filter cloth 9). The telescopic movement of the electric push rod 305 pulls the filter cloth 9 into the storage cylinder 303. The filter cloth 9 pulls the sliding ring 304 to slide along the sampling cylinder 5 and the protective housing 301. By regularly pulling the filter cloth 9 into the storage cylinder 303 by the electric push rod 305, the position of the filter cloth 9 filtering the solution is changed, ensuring the sampling rate of the soil solution. At the same time, the two sealing rings 306 fit and seal the filter cloth 9 to prevent the solution in the soil layer from adhering to the filter cloth 9 in advance, affecting the actual service life of the filter cloth 9.

[0034] When the sampling of the soil solution is completed, the negative pressure pump is turned off, and the driving module 6 is controlled to drive the sampling cylinder 5 and the protective housing 301 to be recovered into the fixed cylinder 4. Then, the drilling rig 1 is pulled out, and the device is cleaned and the filter cloth 9 is replaced. When sampling the soil solution again, repeat the above steps.

[0035] Embodiment 3

[0036] This embodiment discloses a soil solution sampling device for forestry exploration, which is further improved on the basis of Embodiment 2.

[0037] As Figure 3 and Figures 6 - 9As shown, a plugging cylinder 401 is slidably connected to the outside of the protection shell 301. The plugging cylinder 401 is used to plug all corresponding holes 302 on the protection shell 301. Initially, the plugging cylinder 401 plugs all the corresponding holes 302. A first elastic member 402 is arranged between the plugging cylinder 401 and the sampling cylinder 5. The first elastic member 402 is a spring and is used to drive the plugging cylinder 401 to reset. A positioning rod 403 is slidably connected to the right part of the plugging cylinder 401. The positioning rod 403 is used to connect the protection shell 301 and the plugging cylinder 401. Initially, the protection shell 301 and the plugging cylinder 401 are an integral structure under the limitation of the positioning rod 403, that is, the protection shell 301 drives the plugging cylinder 401 to move synchronously. A second elastic member 404 is arranged between the positioning rod 403 and the plugging cylinder 401. The second elastic member 404 is a tension spring and is used to drive the positioning rod 403 to reset. An extrusion block 405 is fixedly connected to the left part inside the fixed cylinder 4. Both the positioning rod 403 and the extrusion block 405 are provided with inclined surfaces, and the inclined directions of the two inclined surfaces are the same. The inclined surface of the extrusion block 405 is used to extrude the positioning rod 403 to slide upward, and the positioning rod 403 is separated from the protection shell 301 but not from the plugging cylinder 401. The extrusion block 405 is used to limit the positioning rod 403 from continuing to move leftward, so that the protection shell 301 and the plugging cylinder 401 are separated and slide relative to each other. At the same time, the extrusion block 405 laterally limits the positioning rod 403, so that the protection shell 301 and the plugging cylinder 401 are misaligned and slide to open the corresponding holes 302.

[0038] Working principle: When the driving module 6 drives the sampling cylinder 5 and the protective housing 301 into the soil layer, the protective housing 301 will come into contact with the soil layer on the side wall. The solution in the upper soil flows downward along the side wall of the drill hole and is very likely to enter the corresponding holes 302 and adhere to the filter cloth 9, thus affecting the accuracy of soil solution sampling. Therefore, in the initial state, the blocking cylinder 401 blocks the several corresponding holes 302, and the blocking cylinder 401 and the protective housing 301 are limited as a whole by the positioning rod 403. The blocking cylinder 401 follows the protective housing 301 into the soil layer synchronously, and the positioning rod 403 on both of them moves synchronously. When the driving module 6 drives the sampling cylinder 5 to be about to reach the limit state and stop, the positioning rod 403 contacts and squeezes the extrusion block 405, causing the positioning rod 403 to move upward under the extrusion force, and at the same time, the second elastic member 404 is stretched, releasing the mutual limitation between the blocking cylinder 401 and the protective housing 301. At this time, the two can slide relative to each other, and at this moment, the extrusion block 405 forms a lateral limit on the positioning rod 403, that is, the sampling cylinder 5 can drive the protective housing 301 to continue to penetrate into the soil layer, while the blocking cylinder 401 cannot move forward. The protective housing 301 and the blocking cylinder 401 produce a dislocation slide, and at the same time, the first elastic member 402 is compressed, so that the blocking cylinder 401 releases the blocking of the several corresponding holes 302 and then the sampling cylinder 5 stops moving. Then the sampling of the soil solution starts. By blocking the several corresponding holes 302 on the protective housing 301 in advance with the blocking cylinder 401 and releasing the blocking of the several corresponding holes 302 by the blocking cylinder 401 after the sampling cylinder 5 penetrates into the soil layer, it is avoided that the soil solution in other positions adheres to the filter cloth 9 and affects the final sampling result.

[0039] After the sampling is completed, the driving module 6 drives the sampling cylinder 5 to be recovered into the fixed cylinder 4. The sampling cylinder 5 drives the protective housing 301 to reset synchronously, and the first elastic member 402 resets. Then the extrusion block 405 releases the limit and extrusion on the positioning rod 403, and the second elastic member 404 drives the positioning rod 403 to insert into the protective housing 301, connecting the protective housing 301 and the blocking cylinder 401 as a whole. In this way, until the sampling cylinder 5 is completely reset to the initial state. When the soil solution needs to be sampled again, repeat the above steps.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soil solution sampling device for forestry exploration, comprising a drilling rig (1), the drilling rig (1) is composed of a drill pipe (101), a plurality of connecting pieces (102) and a cone block (103), the drill pipe (101) is fixedly connected through the plurality of connecting pieces (102) and the cone block (103), and a control module (2) for driving itself to rotate is arranged at the top of the drilling rig (1), characterized in that, A sliding rod (3) is rotatably and slidably connected inside the drilling rig (1). The sliding rod (3) is fixedly connected to a fixed cylinder (4). The central axis of the sliding rod (3) intersects and is perpendicular to the central axis of the fixed cylinder (4). A sampling cylinder (5) is slidably connected inside the fixed cylinder (4). A driving module (6) for driving the movement of the sampling cylinder (5) is arranged inside the fixed cylinder (4). The sampling cylinder (5) is provided with a plurality of sampling holes (7). The sampling cylinder (5) is fixedly connected to a negative pressure pipe (8). The negative pressure pipe (8) is communicated with the plurality of sampling holes (7) through the sampling cylinder (5). A positioning component for positioning the sampling position of the sampling cylinder (5) is arranged on the drilling rig (1).

2. The soil solution sampling device for forestry exploration according to claim 1, characterized in that, A filter cloth (9) for filtering external soil is arranged outside the sampling cylinder (5). The filter cloth (9) covers a plurality of the sampling holes (7).

3. The soil solution sampling device for forestry exploration according to claim 2, wherein, The positioning component includes a positioning ring (201). The positioning ring (201) is fixedly connected to the drilling rig (1). The positioning ring (201) is provided with a groove. The sliding rod (3) is fixedly connected to a positioning block (202). When the positioning block (202) is located in the groove on the positioning ring (201), the sampling cylinder (5) is positioned.

4. The soil solution sampling device for forestry exploration according to claim 3, characterized in that, The connecting piece (102) is offset from the straight line where the center point of the groove on the positioning ring (201) and the center point of its body are located, for positioning the sampling position of the sampling cylinder (5) for the soil solution.

5. The soil solution sampling device for forestry exploration according to claim 4, characterized in that, The sampling cylinder (5) is detachably connected to a protective shell (301). The protective shell (301) is provided with corresponding holes (302) having the same number as the sampling holes (7), and the sampling holes (7) are aligned with the corresponding holes (302) one by one. A gap is left between the protective shell (301) and the sampling cylinder (5), and the filter cloth (9) is located in the gap between the protective shell (301) and the sampling cylinder (5).

6. The soil solution sampling device for forestry exploration according to claim 5, characterized in that, A storage cylinder (303) is fixedly connected inside the sampling cylinder (5). The storage cylinder (303) is communicated with the gap between the protective shell (301) and the sampling cylinder (5). A sliding ring (304) is slidably connected to the protective shell (301) and the sampling cylinder (5) together. An electric push rod (305) is fixedly connected inside the sampling cylinder (5). The telescopic end of the electric push rod (305) is hermetically slidably connected to the storage cylinder (303). Both ends of the filter cloth (9) are fixedly connected to the sliding ring (304) and the telescopic end of the electric push rod (305) respectively.

7. The soil solution sampling device for forestry exploration according to claim 5, characterized in that, Both the protective shell (301) and the sampling cylinder (5) are fixedly connected with sealing rings (306). The two sealing rings (306) form a clamping seal for the filter cloth (9).

8. The soil solution sampling device for forestry exploration according to claim 7, characterized in that, A plugging cylinder (401) is slidably connected to the outside of the protective shell (301). The plugging cylinder (401) is used to plug all the corresponding holes (302) on the protective shell (301). A first elastic member (402) is arranged between the plugging cylinder (401) and the sampling cylinder (5).

9. The soil solution sampling device for forestry exploration according to claim 8, characterized in that, The plugging cylinder (401) is slidably connected with a clamping rod (403), and the clamping rod (403) is used to connect the protective shell (301) and the plugging cylinder (401). A second elastic member (404) is arranged between the clamping rod (403) and the plugging cylinder (401).

10. The soil solution sampling device for forestry exploration according to claim 9, characterized in that, The fixed cylinder (4) is fixedly connected with an extrusion block (405), and the extrusion block (405) is used to extrude and limit the clamping rod (403) so that the protective shell (301) and the plugging cylinder (401) are separated and slide relative to each other.

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