A soil solution sampling device for forestry exploration

Abstract

The present invention relates to the field of geological survey technology, and in particular to a soil solution sampling device for forestry exploration. The device comprises a drilling frame, the drilling frame being composed of a drill rod, a plurality of connecting members and a cone block, the drill rod being fixedly connected to the cone block by the plurality of connecting members, a control module being provided on the top of the drilling frame, a sliding rod being rotatably and slidably connected inside the drilling frame, a fixed cylinder being fixedly connected to the sliding rod, a sampling cylinder being slidably connected inside the fixed cylinder, a driving module being provided inside the fixed cylinder, a plurality of sampling holes being provided in the sampling cylinder, and a positioning assembly being provided on the drilling frame. The present invention vertically drills holes in the soil layer through the drilling frame, and then the fixed cylinder penetrates into the soil layer 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, thereby improving the accuracy of soil layer solution sampling.

Description

Technical Field

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

[0002] Forestry exploration is an important basic work for conducting forest resource surveys, ecological assessments and sustainable management. During the forestry exploration process, the detection of soil solutions 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. Through comprehensive analysis of various ions, organic matter and trace elements in soil solutions, the soil fertility level can be assessed more accurately, scientific and reasonable forest management strategies can be formulated, the high-quality development of forest resources can be promoted, and an active role can be played in responding to climate change and protecting biodiversity.

[0003] At present, commonly used soil solution sampling devices usually adopt the method of first drilling a vertical hole and then sampling from the bottom of the hole. However, in actual operation, when the moisture content of the soil layer is high, the solution in the upper soil layer will seep downward along the inner wall of the hole and mix with the soil solution at the bottom, causing the composition and concentration of the collected samples to change. This phenomenon not only reduces the representativeness of the sample, but also affects the accuracy of subsequent test data, thereby misleading soil quality assessment and forest management decisions. Summary of the Invention

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

[0005] Technical solution: A soil solution sampling device for forestry exploration, comprising a drilling frame, wherein the drilling frame is composed of a drill rod, a plurality of connecting parts and a cone block, the drill rod is fixedly connected to the cone block through the plurality of connecting parts, a control module for driving its own rotation is provided on the top of the drilling frame, a sliding rod is rotated 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 with the central axis of the fixed cylinder and is perpendicular to each other, a sampling cylinder is slidably connected inside the fixed cylinder, a driving module for driving the sampling cylinder to move is provided in the fixed cylinder, the sampling cylinder is provided with a plurality of sampling holes, the sampling cylinder is fixedly connected to a negative pressure tube, the negative pressure tube is connected to the plurality of sampling holes through the sampling cylinder, and a positioning component for positioning the sampling position of the sampling cylinder is provided on the drilling frame.

[0006] It is further explained that a filter cloth for filtering external soil is provided on the outside of the sampling cylinder, and the filter cloth blocks several of the sampling holes.

[0007] Further description, the positioning assembly includes a positioning ring, the positioning ring is fixedly connected to the drilling frame, 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 tube is positioned.

[0008] It is further explained that the connecting piece is misaligned with the straight line connecting the center point of the groove on the positioning ring and the center point of its body, which is used to locate the sampling position of the sampling tube for the soil solution.

[0009] It is further explained that the sampling barrel is detachably connected to 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 one by one with the corresponding holes, a gap is left between the protective shell and the sampling barrel, and the filter cloth is located in the gap between the protective shell and the sampling barrel.

[0010] It is further explained that the interior of the sampling cylinder is fixedly connected to a storage cylinder, the storage cylinder is communicated with the gap between the protective shell and the sampling cylinder, the protective shell and the sampling cylinder are slidably connected with a sliding ring, an electric push rod is fixedly connected inside the sampling cylinder, the telescopic end of the electric push rod is sealingly and slidably connected to the storage cylinder, and the two ends of the filter cloth are respectively fixedly connected to the sliding ring and the telescopic end of the electric push rod.

[0011] It is further explained that the protective shell and the sampling tube are both fixedly connected with sealing rings, and the two sealing rings form a clamping seal on the filter cloth.

[0012] It is further explained that a sealing cylinder is slidably connected to the outside of the protective shell, and the sealing cylinder is used to seal all the corresponding holes on the protective shell. A first elastic member is provided between the sealing cylinder and the sampling cylinder.

[0013] It is further explained that the blocking tube is slidably connected to a locking rod, which is used to connect the protective shell and the blocking tube, and a second elastic member is provided between the locking rod and the blocking tube.

[0014] It is further explained that the fixing cylinder is fixedly connected to an extrusion block, and the extrusion block is used to squeeze and limit the positioning rod, so that the protective shell and the blocking cylinder are separated and slide against each other.

[0015] The beneficial effects are as follows: 1. The present invention uses a drilling frame to vertically drill holes in the soil layer, and then a fixed cylinder penetrates into the interior of the soil layer 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, thereby improving the accuracy of soil 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;

[0020] Figure 2 Schematic diagram of the three-dimensional structure of the positioning ring and the positioning block of the present invention;

[0021] Figure 3 It is a schematic cross-sectional view of the three-dimensional structure of the fixing cylinder of the present invention;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the blocking cylinder and the driving module of the present invention;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the sampling tube of the present invention;

[0024] Figure 6 This is a schematic diagram of the three-dimensional structure of the protective housing and the sealing ring of the present invention;

[0025] Figure 7 Schematic diagram of the three-dimensional structure of the storage cylinder of the present invention;

[0026] Figure 8 Schematic diagram of the three-dimensional structure of the sliding ring and the electric push rod of the present invention;

[0027] Figure 9 It is a schematic diagram of the three-dimensional structure of the locking rod and the extrusion block of the present invention.

[0028] 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

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, 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 intended to limit the present invention.

[0030] Example 1

[0031] This embodiment discloses a soil solution sampling device for forestry exploration, which is mainly used to improve the accuracy of soil solution sampling.

[0032] like Figures 1-6As shown, it includes a drilling frame 1, which consists of a drill rod 101, two connecting pieces 102 and a cone block 103. The drill rod 101 is fixedly connected to the cone block 103 at the bottom through the two connecting pieces 102. The cone block 103 facilitates penetrating into the soil. A control module 2 for driving its own rotation is provided on the top of the drilling frame 1. A sliding rod 3 is rotated and slidably connected inside the drilling frame 1. The sliding rod 3 is 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 with the central axis of the fixed cylinder 4 and is perpendicular to each other. A sampling cylinder 5 is slidably connected in the fixed cylinder 4. The length of the sampling cylinder 5 is smaller than the maximum diameter of the drilling frame 1. A through hole for the sampling cylinder 5 to probe out is opened on the left side of the fixed cylinder 4. A driving module 6 for driving the sampling cylinder 5 to move is provided in the fixed cylinder 4. The driving module 6 consists of a servo motor and a screw. The servo motor is fixedly connected to the sampling cylinder 5. The output shaft of the servo motor is fixedly connected to the screw, which is threadedly connected to the sampling barrel 5. The sampling barrel 5 is provided with a plurality of sampling holes 7. The sampling holes 7 are located on the left side of the sampling barrel 5, which is convenient for extracting soil solution deep in the side wall of the soil layer, thereby improving the accuracy of soil solution extraction. The sampling barrel 5 is fixedly connected with a negative pressure tube 8, which is connected to the plurality of sampling holes 7 through the sampling barrel 5. The negative pressure tube 8 is connected to an external negative pressure pump for providing extraction force for extracting soil solution. A channel (not shown in the figure) is provided inside the sliding rod 3. The negative pressure tube 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 barrel 5 is provided on the drilling frame 1. A filter cloth 9 for filtering external soil is provided on the outside of the sampling barrel 5. The filter cloth 9 is a ring-shaped cloth when normally flattened. The filter cloth 9 blocks a plurality of sampling holes 7. The filter cloth 9 is made of polyester fiber, has strong wear resistance and low cost.

[0033] like Figure 2 As shown, the positioning assembly includes a positioning ring 201, which is fixedly connected to the drilling frame 1. The positioning ring 201 is provided with a groove. The two connecting pieces 102 are misaligned with the straight line connecting the center point of the groove on the positioning ring 201 and the center point of its body, and are used to position the sampling position of the sampling tube 5 for the soil solution to prevent the sampling tube 5 from colliding with the connecting piece 102 when the sampling tube 5 protrudes from the fixed tube 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 tube 5 is positioned.

[0034] Working principle: When it is necessary to use this device to sample forest soil solution, the staff manipulates the device vertically to the ground and starts to rotate the drilling frame 1 through the control module 2. The drilling frame 1 rotates and starts to penetrate into the ground. At the same time, the drilling frame 1 drives the sliding rod 3 to move downward synchronously. During this period, the drilling frame 1 rotates at high speed and penetrates into the soil layer. During the downward movement of the drilling frame 1, the staff always maintains the relative position of the control module 2 and the sliding rod 3, so that the drilling frame 1 will not drive the sliding rod 3 to rotate synchronously, and this is done until the drilling frame 1 drives the fixed tube 4 to reach the sampling depth through the sliding rod 3. Then the staff closes the drilling frame 1, pulls up and rotates the sliding rod 3, so that the sliding rod 3 drives the positioning block 202 thereon to move synchronously, so that the positioning block 202 fits the lower side of the positioning ring 201 and finally enters the groove thereon. At this moment, the protruding position of the sampling tube 5 is misaligned with the connecting piece 102 to avoid collision between the sampling tube 5 and the connecting piece 102.

[0035] After the positioning of the fixed cylinder 4 is completed, 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, so that the sampling cylinder 5 penetrates into the interior of the soil layer from the side wall thereof, and so on 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 extracted by the extraction force and enters the negative pressure pipe 8 from several sampling holes 7, and is finally 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. This is done until the soil solution sampling is completed. The soil layer is vertically drilled through the drilling frame 1, and then the fixed cylinder 4 penetrates into the interior of the soil layer 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 sampling soil layer, thereby improving the accuracy of soil layer solution sampling.

[0036] When the soil solution sampling is completed, the external negative pressure pump is turned off, and then the driving module 6 drives the sampling tube 5 to be recovered into the fixed tube 4, and the drilling frame 1 is pulled out and the device is cleaned. When the soil solution needs to be sampled again, the above steps are repeated.

[0037] Example 2

[0038] This embodiment discloses a soil solution sampling device for forestry exploration, which is further improved on the basis of Example 1.

[0039] like Figure 3-Figure 5As shown, the outside of the sampling tube 5 is detachably connected to a protective shell 301, which is used to remove the protective shell 301 and replace the internal filter cloth 9. The left end of the protective shell 301 is a cone structure, which is convenient for inserting itself into the soil layer. The protective shell 301 is provided with corresponding holes 302 with the same number as the sampling holes 7, and the sampling holes 7 are aligned one by one with the corresponding holes 302. An annular gap is left between the protective shell 301 and the sampling tube 5, and the filter cloth 9 is located in the annular gap between the protective shell 301 and the sampling tube 5, which is used to allow the external soil solution to be filtered by the corresponding holes 302. The hole 302, the filter cloth 9 and the sampling hole 7 enter the negative pressure tube 8, and the contact area between the filter cloth 9 and the soil layer is reduced through the protective shell 301, reducing the probability of the filter cloth 9 being scratched. The interior of the sampling cylinder 5 is fixedly connected with a storage cylinder 303. The left part of the storage cylinder 303 is connected with the annular gap between the protective shell 301 and the sampling cylinder 5. The protective shell 301 and the sampling cylinder 5 are slidably connected with a sliding ring 304. There is friction between the protective shell 301 and the sampling cylinder 5 and the sliding ring 304 to ensure that the outer peripheral side of the filter cloth 9 is During the change of position, it is in a flattened state, the sliding ring 304 is located in the annular gap between the protective shell 301 and the sampling cylinder 5, and the sampling cylinder 5 is fixedly connected with an electric push rod 305. The telescopic end of the electric push rod 305 is sealed and slidably connected to the storage cylinder 303. The telescopic end of the electric push rod 305 is initially located at the left end of the storage cylinder 303, and the clogged area on the filter cloth 9 can be stored in the sealed storage cylinder 303. The two 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 contracted end 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 on the soil solution and ensuring the sampling rate of the soil solution. The protective shell 301 and the sampling cylinder 5 are fixedly connected with sealing rings 306. The two sealing rings 306 are located on the right side of the sampling hole 7 and the corresponding hole 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 and affecting the flow area of ​​the filter cloth 9.

[0040] Working principle: When the driving module 6 drives the sampling tube 5 to penetrate into the soil layer, the sampling tube 5 drives the protective shell 301 thereon to move synchronously, and the protective shell 301 is in direct contact with the soil layer, so that the sampling tube 5 penetrates into the soil layer and stops moving. Then, the external negative pressure pump is turned on to start extracting the solution in the soil layer. The soil solution passes through the filter cloth 9 and the sampling holes 7 from the corresponding holes 302 and enters the negative pressure tube 8. The filter cloth 9 is wrapped by the protective shell 301 and the sampling tube 5, so that the protective shell 301 reduces the contact area between the soil layer and the filter cloth 9, reduces the probability of the filter cloth 9 being scratched by the soil layer, and ensures that the negative pressure tube 8 can smoothly extract the soil solution.

[0041] During soil solution sampling, the filter cloth 9 filters the solution and blocks the external soil. The filter cloth 9 is likely to be blocked, thereby reducing the sampling rate of the soil solution. Therefore, when negative pressure is extracted from the soil layer, the electric push rod 305 is turned on, so that the telescopic end of the electric push rod 305 slides inward regularly along the storage tube 303 (the single sliding distance is the same as the length of the sampling hole 7, so as to fully utilize 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 tube 303, and the filter cloth 9 pulls the sliding ring 304 to slide along the sampling tube 5 and the protective shell 301. The filter cloth 9 is regularly pulled into the storage tube 303 by the electric push rod 305, changing the position of the filter cloth 9 filtering the solution to ensure 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 use time of the filter cloth 9.

[0042] When the soil solution sampling 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 shell 301 to be recovered into the fixed cylinder 4. Then the drilling frame 1 is pulled out, the device is cleaned and the filter cloth 9 is replaced. The above steps are repeated when the soil solution is sampled again.

[0043] Example 3

[0044] This embodiment discloses a soil solution sampling device for forestry exploration, which is further improved on the basis of Example 2.

[0045] like Figure 3 and Figure 6-Figure 9As shown, the protective shell 301 is slidably connected to the outside with a blocking cylinder 401, and the blocking cylinder 401 is used to block all corresponding holes 302 on the protective shell 301. The initial blocking cylinder 401 blocks all corresponding holes 302. A first elastic member 402 is provided between the blocking cylinder 401 and the sampling cylinder 5. The first elastic member 402 is a spring, which is used to drive the blocking cylinder 401 to reset. The right part of the blocking cylinder 401 is slidably connected with a locking rod 403, which is used to connect the protective shell 301 and the blocking cylinder 401. The locking rod 403 is used to connect the protective shell 301 and the blocking cylinder 401. The initial protective shell 301 and the blocking cylinder 401 are an integrated structure under the limit of the locking rod 403, that is, the protective shell 301 drives the blocking cylinder 401 to move synchronously, and the locking rod A second elastic member 404 is provided between 403 and the blocking tube 401. The second elastic member 404 is a tension spring, which is used to drive the locking rod 403 to reset. The left part of the fixed tube 4 is fixedly connected with an extrusion block 405. The locking rod 403 and the extrusion block 405 are both provided with inclined surfaces, and the inclined directions of the inclined surfaces of the two are the same. The inclined surface of the extrusion block 405 is used to squeeze the locking rod 403 to slide upward, and the locking rod 403 is separated from the protective shell 301, but not from the blocking tube 401. The extrusion block 405 is used to limit the locking rod 403 to continue to move to the left, so that the protective shell 301 and the blocking tube 401 are separated and slide with each other. At the same time, the extrusion block 405 limits the locking rod 403 laterally, so that the protective shell 301 and the blocking tube 401 are offset and slide to open the corresponding hole 302.

[0046] Working principle: when the driving module 6 drives the sampling tube 5 and the protective shell 301 to enter the soil layer, the protective shell 301 will contact the soil layer at the side wall, and the solution in the upper soil layer will flow downward along the side wall of the borehole, and will easily enter the corresponding hole 302 and adhere to the filter cloth 9, thereby affecting the accuracy of soil solution sampling. Therefore, in the initial state, the blocking tube 401 is in a blocking state for several corresponding holes 302, and the blocking tube 401 and the protective shell 301 are limited as a whole by the blocking rod 403. The blocking tube 401 follows the protective shell 301 and enters the soil layer synchronously, and the two drive the blocking rod 403 thereon to move synchronously. When the driving module 6 drives the sampling tube 5 to reach the limit state and stop, the blocking rod 403 contacts and squeezes the extrusion block 405, causing the blocking rod 403 to move upward under the extrusion force. The elastic member 404 is stretched, releasing the mutual restriction on the sealing tube 401 and the protective shell 301. At this time, the two can slide against each other, and at this moment, the extrusion block 405 forms a lateral restriction on the positioning rod 403, that is, the sampling tube 5 can drive the protective shell 301 to continue to penetrate the soil layer, while the sealing tube 401 cannot continue to move. The protective shell 301 and the sealing tube 401 produce dislocated sliding. At the same time, the first elastic member 402 is compressed, so that the sealing tube 401 releases the blockage of several corresponding holes 302, and the sampling tube 5 stops moving. Then, the sampling of the soil solution is started. The corresponding holes 302 on the protective shell 301 are blocked in advance by the sealing tube 401. After the sampling tube 5 penetrates into the soil layer, the blocking of the corresponding holes 302 by the blocking tube 401 is released to prevent the soil solution in other positions from adhering to the filter cloth 9 and affecting the final sampling results.

[0047] When sampling is completed, the driving module 6 drives the sampling tube 5 to be recovered into the fixed tube 4, and the sampling tube 5 drives the protective shell 301 to reset synchronously, the first elastic member 402 resets, and then the squeezing block 405 releases the limit and squeezing of the locking rod 403, and the second elastic member 404 drives the locking rod 403 to be inserted into the protective shell 301, connecting the protective shell 301 and the blocking tube 401 as a whole, so that the sampling tube 5 is completely reset to the initial state. When the soil solution needs to be sampled again, the above steps are repeated.

[0048] 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 scope of protection of the present invention.

Claims

1. A soil solution sampling device for forestry exploration, comprising a drilling frame (1), wherein the drilling frame (1) is composed of a drill rod (101), a plurality of connecting members (102) and a cone block (103), wherein the drill rod (101) is fixedly connected to the cone block (103) via the plurality of connecting members (102), and a control module (2) for driving the drilling frame (1) to rotate is provided on the top of the drilling frame, wherein the drilling frame (1) is characterized in that: The drilling frame (1) is internally connected to a sliding rod (3) that rotates and slides, and the sliding rod (3) is fixedly connected to a fixed cylinder (4). The central axis of the sliding rod (3) intersects with the central axis of the fixed cylinder (4) and is perpendicular to each other. A sampling cylinder (5) is slidably connected to the fixed cylinder (4), and a driving module (6) for driving the sampling cylinder (5) to move is provided in 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 tube (8), and the negative pressure tube (8) is connected to 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 provided on the drilling frame (1).

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

3. A soil solution sampling device for forestry exploration according to claim 2, characterized in that: The positioning assembly includes a positioning ring (201), the positioning ring (201) is fixedly connected to the drilling frame (1), the positioning ring (201) is provided with a groove, and 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 tube (5) is positioned.

4. A soil solution sampling device for forestry exploration according to claim 3, characterized in that: The connecting piece (102) is misaligned with a straight line connecting the center point of the groove on the positioning ring (201) and the center point of the body thereof, and is used to locate the sampling position of the sampling tube (5) for soil solution.

5. The soil solution sampling device for forestry exploration according to claim 4, characterized in that: The sampling barrel (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 one by one with the corresponding holes (302), a gap is left between the protective shell (301) and the sampling barrel (5), and the filter cloth (9) is located in the gap between the protective shell (301) and the sampling barrel (5).

6. A soil solution sampling device for forestry exploration according to claim 5, characterized in that: A storage cylinder (303) is fixedly connected to the interior of the sampling cylinder (5), the storage cylinder (303) is communicated with the gap between the protective shell (301) and the sampling cylinder (5), the protective shell (301) and the sampling cylinder (5) are slidably connected to a sliding ring (304), an electric push rod (305) is fixedly connected to the interior of the sampling cylinder (5), the telescopic end of the electric push rod (305) is sealingly and slidably connected to the storage cylinder (303), and the two 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: The protective housing (301) and the sampling cylinder (5) are both fixedly connected with sealing rings (306), and the two sealing rings (306) form a clamping seal on the filter cloth (9).

8. The soil solution sampling device for forestry exploration according to claim 7, characterized in that: The protective shell (301) is externally slidably connected to a blocking cylinder (401), and the blocking cylinder (401) is used to block all the corresponding holes (302) on the protective shell (301). A first elastic member (402) is provided between the blocking cylinder (401) and the sampling cylinder (5).

9. The soil solution sampling device for forestry exploration according to claim 8, characterized in that: The blocking tube (401) is slidably connected to a locking rod (403), and the locking rod (403) is used to connect the protective shell (301) and the blocking tube (401). The locking rod (403) is used to connect the protective shell (301) and the blocking tube (401), and a second elastic member (404) is provided between the locking rod (403) and the blocking tube (401).

10. The soil solution sampling device for forestry exploration according to claim 9, characterized in that: The fixed cylinder (4) is fixedly connected to a squeezing block (405), and the squeezing block (405) is used to squeeze and limit the positioning rod (403), so that the protective shell (301) and the blocking cylinder (401) are separated and slide relative to each other.

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