Environmental moisture detector for cultivated land in stony desertification area

Abstract

The invention discloses an environmental moisture detector for cultivated land in a stony desertification area, and relates to the technical field of environmental detection, the environmental moisture detector comprises a stand column and a spiral blade surrounding the stand column, the spiral blade is fixedly connected with the stand column, and the environmental moisture detector also comprises a plurality of moisture probes which are longitudinally arranged and distributed on one side of the stand column, the double-layer pipeline is mounted at the tail end of the moisture probe, used for pushing the moisture probe to extend outwards in a stepped manner and capable of automatically rotating and displacing to avoid obstacles; the driving mechanism is arranged on the double-layer pipeline and capable of driving the double-layer pipeline to horizontally displace; the moisture probe is pushed by the double-layer pipeline to extend outwards in a step shape, adaptive distribution is achieved according to the growth characteristics of plant roots from near to far and from shallow to deep, the detection adaptability and pertinence are improved, the moisture probe and the double-layer pipeline are connected through the spiral hook, automatic rotation is achieved to avoid obstacles, and the detection efficiency is improved. The method adapts to a complex geological environment, and the overall detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental detection, in particular to an environmental moisture detector for cultivated land in rocky desertification areas. Background Art

[0002] Due to the high gravel content, poor water retention and severe soil erosion in rocky desertification areas, when planting different plants in cultivated land in rocky desertification areas, it is necessary to conduct moisture testing on the soil conditions in the rocky desertification areas and obtain comprehensive and accurate moisture data of soil at different depths. Different plants have different requirements for soil moisture. When it is detected that the soil moisture content is insufficient, the drip irrigation system needs to be started to increase the moisture content. Through accurate moisture testing, the vegetation survival rate can be improved and ecological restoration can be promoted.

[0003] Traditional moisture testing involves either testing the moisture in the soil or the moisture in the air, and most tests are performed at fixed points. However, when different plants are planted on farmland, the root growth and water absorption of different plants vary, so fixed-point testing can easily lead to inaccurate test data. For example, compared to herbaceous plants, which have shallower root systems, only the moisture in the upper soil layer needs to be tested. However, for economic crops such as trees with well-developed root systems and deep roots, simply testing the moisture in the upper soil layer cannot serve as actual reference data. At present, traditional moisture detectors usually insert probes directly into the soil and collect data at different levels by adjusting the insertion depth. However, since the distribution of plant roots is not always vertical, the detection values ​​obtained by the traditional vertical insertion method cannot accurately reflect the moisture conditions near the plant roots, and the collection results deviate from the actual situation. In addition, the soil in rocky desertification areas often contains hard obstructions such as gravel and rocks. If the probe hits gravel or rocks during insertion, it is easy to cause jamming. During the adjustment process, the probe needs to be completely pulled out, resulting in reduced data collection efficiency.

[0004] In response to the above problems, the present invention proposes a detection needle with a stepped outward extension distribution. This detection needle can adapt to the natural distribution of plant roots and can automatically avoid obstacles when encountering them, thereby avoiding the jamming phenomenon and improving the accuracy and efficiency of data collection. Summary of the Invention

[0005] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide an environmental moisture detector for cultivated land in rocky desertification areas, so as to solve the problem proposed in the above background technology that the soil moisture content near the plant roots cannot be accurately collected during the detection process, resulting in inaccurate detection values.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an environmental moisture detector for cultivated land in rocky desertification areas, comprising a column and a spiral blade surrounding the exterior of the column, the spiral blade being fixedly connected to the column, a plurality of moisture detection needles arranged longitudinally on one side of the column, a double-layer pipe mounted at the ends of the moisture detection needles for driving the moisture detection needles to extend outward in a stepped manner and capable of automatically rotating to avoid obstacles, and a drive mechanism mounted on the double-layer pipe for driving the double-layer pipe to move horizontally. A display electrically connected to the moisture detection needle is installed near the top of the column.

[0007] Preferably, the double-layer pipe includes an outer pipe that passes through the column, an inner pipe that is sleeved inside the outer pipe, and an extension pipe that is fixedly connected to the end of the outer pipe; A limiting pipe is inserted into the side surface of the column at a position corresponding to the outer pipe, and a sliding connection is adopted between the outer pipe and the limiting pipe.

[0008] Preferably, there are a plurality of double-layer pipes, and the plurality of double-layer pipes are connected to a plurality of moisture detection needles in a one-to-one correspondence, and the lengths of the double-layer pipes gradually decrease from top to bottom.

[0009] Preferably, a spiral groove is formed on the surface of each outer layer pipe, and the pitch of the spiral groove decreases gradually from top to bottom.

[0010] Preferably, the driving mechanism includes a worm, a worm wheel is engaged with a position corresponding to the double-layer pipe on one side of the worm, the worm wheel is sleeved on the outside of the outer pipe, and a first shift rod passing through the spiral groove is welded to the inner wall of the worm wheel, and the worm wheel and the column are connected in a rotating manner through a bearing.

[0011] Preferably, a limit rod is welded to the inner wall of the extension pipe, and a return spring is sleeved on the outside of the limit rod, and a sliding connection is adopted between the front end of the limit rod and the inner pipe.

[0012] Preferably, a second lever penetrating the spiral groove is welded to one end of the outer wall of the inner pipe close to the moisture detection needle. The second lever slides along the inner wall of the spiral groove, driving the inner pipe to rotate and displace along the inner wall of the outer pipe, accompanied by compression of the return spring.

[0013] Preferably, a spiral hook is inserted at the end of the moisture detection needle, and the other end of the spiral hook is fixedly connected to the inner pipe. A protective shell is sleeved on the outside of the moisture detection needle, one side of the protective shell is set as an open structure, and the front end of the protective shell is set as a serrated shape.

[0014] Preferably, a first rotating hand wheel is installed on the top of the column, a groove is provided on the side of the column, and a second rotating hand wheel is provided in the groove, and the second rotating hand wheel is fixedly connected to the worm; One side of the display is electrically connected to one end of a plurality of wires, and the other ends of the wires pass through the spiral hooks and are electrically connected to the moisture detection needles.

[0015] Compared with the prior art, the present invention has the following beneficial effects: By setting up a number of longitudinally arranged moisture detection needles on one side of the column, a double-layer pipe is installed at the end of each moisture detection needle. The length of the double-layer pipe gradually shortens from top to bottom. The corresponding moisture detection needles are driven by the double-layer pipe to extend outward in a stepped layout to adapt to the root distribution of various plants. The stepped moisture detection needles can flexibly adapt to the root distribution of various plants according to the characteristics of plant roots growing from near to far and from shallow to deep. No matter how the plant roots grow, there will be detection needles of corresponding depth for moisture detection, which improves the adaptability and pertinence of the detection.

[0016] In addition, a driving mechanism is added inside the column to convert the rotational motion into the axial extension of the moisture detection needle. Through the rotation of the worm gear, each moisture detection needle is driven to perform horizontal displacement. Since the pitch of the spiral groove of the double-layer pipe gradually decreases, under the conditions of a fixed worm gear transmission ratio and a consistent rotation period, the design of the decreasing pitch of the spiral groove of the outer pipe can make the moisture detection needle present a stepped extension effect from top to bottom.

[0017] In addition, the moisture detection needle and the inner pipe are connected by a metal spiral hook. When the moisture detection needle is obstructed, the inner pipe contracts inward and rotates at the same time, driving the moisture detection needle at the front to rotate and displace to bypass the obstacle. At the same time, the spiral hook undergoes elastic bending, automatically changing the original path to avoid hard squeezing of the moisture detection needle and hard obstacles. It is suitable for moisture detection in complex geological environments such as soil containing gravel and rocks. There is no need to pull it out and repeatedly adjust the position, which improves the overall detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the internal structure of the column of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the moisture detection needle of the present invention after being extended outward.

[0021] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0022] Figure 5 This is a schematic structural diagram of the moisture detection needle of the present invention.

[0023] Figure 6 It is a schematic diagram of the cross-sectional structure of the double-layer pipeline of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the inner layer pipe after shrinking backwards of the present invention.

[0025] Figure 8 It is a schematic diagram of the cross-sectional structure of the column of the present invention.

[0026] In the figure: 1. Column; 101. Limiting pipe; 102. First rotating handwheel; 103. Second rotating handwheel; 2. Spiral blade; 3. Moisture detection needle; 4. Double-layer pipe; 401. Outer pipe; 402. Inner pipe; 403. Extension pipe; 404. Spiral groove; 405. Limiting rod; 406. Return spring; 407. Second lever; 5. Driving mechanism; 501. Worm; 502. Worm wheel; 503. First lever; 6. Display; 7. Spiral hook; 8. Protective shell; 9. Wire. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figures 1 to 8 The present invention provides a technical solution: an environmental moisture detector for cultivated land in rocky desertification areas, comprising a column 1 and a spiral blade 2 surrounding the exterior of the column 1, the spiral blade 2 being fixedly connected to the column 1, a plurality of moisture detection needles 3 arranged longitudinally on one side of the column 1, a double-layer pipe 4 installed at the end of the moisture detection needle 3 for pushing the moisture detection needle 3 to extend outward in a stepped manner and capable of automatically rotating to avoid obstacles, and a driving mechanism 5 provided on the double-layer pipe 4 for driving the double-layer pipe 4 to move horizontally; A display 6 electrically connected to the moisture detection needle 3 is installed near the top of the column 1; A plurality of moisture detection needles 3 are arranged longitudinally on one side of the column 1. The rotation of the column 1 drives the spiral blade 2 to rotate, so that the moisture detection needles 3 on the lower half of the column 1 and its side penetrate into the soil. Then, through the cooperation of the double-layer pipe 4 and the driving mechanism 5, the plurality of moisture detection needles 3 are gradually inserted into the soil from top to bottom in a step-by-step manner to detect the soil moisture values ​​at different layers. The stepped moisture detection needle 3 can flexibly adapt to the root distribution of various plants according to the characteristics of plant roots growing from near to far and from shallow to deep. No matter how the plant roots grow, there will be a detection needle at the corresponding depth for moisture detection, which improves the adaptability and pertinence of detection. In addition, when the moisture detection needle 3 encounters an obstacle while extending outward, the moisture detection needle 3 triggers the double-layer pipe 4 to contract, and at the same time drives the moisture detection needle 3 to contract backward and rotate and displace at the same time to avoid hard contact. It avoids obstacles through automatic rotation and displacement, and is suitable for moisture detection in soil containing gravel, rocks and other complex geological environments. There is no need to pull it out and repeatedly adjust the position, which improves the overall detection efficiency.

[0029] In this embodiment, if Figure 6 、 Figure 7 and Figure 8 As shown, the double-layer pipe 4 includes an outer pipe 401 that passes through the column 1, an inner pipe 402 that is sleeved inside the outer pipe 401, and an extension pipe 403 that is fixedly connected to the end of the outer pipe 401; The side of the column 1 is connected to the position of the outer pipe 401, and the outer pipe 401 and the limiting pipe 101 are connected in a sliding manner. It should be noted that the outer pipe 401, the inner pipe 402, and the extension pipe 403 together form the main frame of a double-layer pipe 4. The inner pipe 402 is connected to the moisture detection needle 3. The inner pipe 402 slides backward along the outer pipe 401, further driving the moisture detection needle 3 to move backward. When encountering an obstacle, it avoids hard squeezing with the obstacle, thereby providing further protection for the moisture detection needle 3. In addition, a limiting pipe 101 is inserted into the position on the side of the column 1 corresponding to the outer pipe 401. The limiting pipe 101 and the column 1 are connected. A slider is installed on the double-layer pipe 4, and a slide groove matching the slider is provided on the inner wall of the limiting pipe 101. Through the cooperation of the slider and the slide groove, the double-layer pipe 4 can only be horizontally displaced along the limiting pipe 101 to prevent the double-layer pipe 4 from deviating. During the initial downward detection process and the subsequent storage process, the moisture detection needle 3 and the double-layer pipe 4 are all stored in the limiting pipe 101 and are protected by the limiting pipe 101.

[0030] In this embodiment, if Figure 2 and Figure 3 As shown, there are a number of double-layer pipes 4, and the double-layer pipes 4 are connected to the moisture detection needles 3 in a one-to-one correspondence, and the length of the double-layer pipes 4 gradually decreases from top to bottom; It should be noted that a double-layer pipe 4 is installed at the end of each moisture detection needle 3. The length of the double-layer pipe 4 gradually shortens from top to bottom, so that the corresponding moisture detection needle 3 is driven by the double-layer pipe 4 to extend outward in a stepped layout. The stepped moisture detection needles 3 can simultaneously obtain moisture data at different depths and horizontal distances, adapt to the root distribution of various plants, and accurately detect the moisture data near the plant roots.

[0031] In this embodiment, if Figure 3 and Figure 4 As shown, a spiral groove 404 is formed on the surface of each outer layer pipe 401, and the pitch of the spiral groove 404 decreases gradually from top to bottom; The driving mechanism 5 includes a worm 501. A worm gear 502 is engaged with one side of the worm 501 at a position corresponding to the double-layer pipe 4. The worm gear 502 is sleeved on the outside of the outer pipe 401. A first lever 503 is welded to the inner wall of the worm gear 502 and passes through the spiral groove 404. The worm gear 502 is rotatably connected to the column 1 via a bearing. It should be noted that the length of the outer pipe 401 gradually shortens from top to bottom, the overall length of the spiral groove 404 is consistent with the corresponding outer pipe 401, and the pitch of the spiral groove 404 gradually decreases. When the worm 501 of the driving mechanism 5 rotates, it drives the worm wheel 502 to rotate. After the worm wheel 502 rotates, the first lever 503 on its inner wall moves along the spiral groove 404. Under the action of the limiting pipe 101 wrapped around the outside, the double-layer pipe 4 can only move forward and backward, converting the rotational motion into the axial extension of the moisture detection needle 3. Due to the decreasing pitch, the following effects are achieved: Upper large pitch: When the worm wheel 502 rotates one circle, the axial movement distance of the moisture detection needle 3 and the double-layer pipe 4 is longer, and the moisture detection needle 3 and the double-layer pipe 4 are quickly extended to a farther position, so as to detect close to the roots of distant plants and improve detection efficiency; Lower layer small pitch: When the worm wheel 502 rotates one circle, the axial movement distance of the moisture detection needle 3 and the double-layer pipe 4 is shortened, reducing the extension speed, making it easier to detect the soil moisture near the roots of nearby plants; Under the condition that the transmission ratio of the worm wheel 502 and the worm 501 is fixed and the rotation period is consistent, the moisture detection needle 3 can present a stepped extension effect from top to bottom by designing the spiral groove 404 of the outer pipe 401 with decreasing pitch.

[0032] In this embodiment, if Figure 6 As shown, a limiting rod 405 is welded to the inner wall of the extension pipe 403 , and a return spring 406 is sleeved on the outside of the limiting rod 405 , and a sliding connection is adopted between the front end of the limiting rod 405 and the inner pipe 402 .

[0033] In this embodiment, if Figure 4 and Figure 6As shown, a second lever 407 penetrating the spiral groove 404 is welded to one end of the outer wall of the inner pipe 402 near the moisture detection needle 3. The second lever 407 slides along the inner wall of the spiral groove 404, driving the inner pipe 402 to rotate and displace along the inner wall of the outer pipe 401, accompanied by the compression of the return spring 406. It should be noted that the extension pipe 403 and the outer pipe 401 are welded. In the initial state, the extension pipe 403, the outer pipe 401 and the inner pipe 402 move synchronously. When the moisture detection needle 3 at the front end touches an obstacle and cannot move forward, a reverse force is formed, which squeezes the inner pipe 402 to contract. The second lever 407 slides along the spiral groove 404, driving the axial contraction and rotation of the inner pipe 402, causing the moisture detection needle 3 at the front end to change its angle, further changing its original motion trajectory and avoiding the obstacle. At this time, even if the double-layer pipe 4 at the rear end continues to move forward, it can avoid hard squeezing between the moisture detection needle 3 and the obstacle. Finally, when resetting, the return spring 406 releases elastic potential energy to push the inner pipe 402 to return to its initial position. In addition, in this embodiment, after the return spring 406 is slightly compressed by the resistance of the soil in the initial state, its elastic force is greater than the resistance of the soil at the front end, and the front end of the return spring 406 is tightly against the rear end of the inner pipe 402, but is not fixedly connected to the inner pipe 402. It can provide a thrust to the inner pipe 402, and will not hinder it when the inner pipe 402 shrinks and moves backward. At the same time, it cooperates with the limit rod 405 to limit the return spring 406, and the inner pipe 402 will slide along the limit rod 405, which can not only realize axial limitation of the inner pipe 402, but also prevent the return spring 406 from twisting.

[0034] In this embodiment, if Figure 5 As shown, a spiral hook 7 is inserted into the end of the moisture detection needle 3, and the other end of the spiral hook 7 is fixedly connected to the inner layer pipe 402. A protective shell 8 is sleeved on the outside of the moisture detection needle 3. One side of the protective shell 8 is set as an open structure, and the front end of the protective shell 8 is set as a serrated structure; It should be noted that the spiral hook 7 is made of metal and has a certain elastic deformation function. The metal spiral hook 7 connects the moisture detection needle 3 and the inner layer pipe 402. When the moisture detection needle 3 encounters an obstacle, the spiral hook 7 and the moisture detection needle 3 rotate and displace, so that the moisture detection needle 3 at the front end first bypasses the obstacle. If it continues to move forward, the spiral hook 7 at the rear end will bend elastically when it encounters an obstacle due to the lateral force, changing the original path, so that the entire environmental moisture detector can complete its task more flexibly and efficiently when facing the complex and changeable farmland environment in rocky desertification areas; In addition, a protective shell 8 is added, and an opening on one side of the protective shell 8 exposes the sensing probe of the moisture detection needle 3 to ensure direct contact with the soil medium. In this embodiment, the serrated front end adopts conical serrations, which can quickly penetrate the soil during the outward extension process, while protecting the moisture detection needle 3 from impact by hard objects, thereby extending its service life.

[0035] In this embodiment, if Figure 1 As shown, a first rotating hand wheel 102 is installed at the top of the column 1, a groove is provided on the side of the column 1, and a second rotating hand wheel 103 is provided in the groove, and a fixed connection is adopted between the second rotating hand wheel 103 and the worm 501; One side of the display 6 is electrically connected to one end of a plurality of wires 9, and the other end of the wires 9 passes through the spiral hook 7 and is electrically connected to the moisture detection needle 3; It should be noted that the spiral blades 2 surrounding the column 1 and the limiting pipe 101 on the side of the column 1 are welded, and are fixedly connected to the column 1 through the first rotating handwheel 102, driving the entire device to rotate synchronously until the moisture detection needle 3 at the bottom is fully inserted into the soil for detection. The second rotating handwheel 103 is connected to the worm 501, driving the entire worm 501 and worm wheel 502 to rotate from the upper layer of the soil; In addition, it should be noted that each wire 9 passes through an inner pipe 402 and a spiral hook 7 separately, and is electrically connected to its corresponding moisture detection needle 3. The direction of the display 6 is consistent with the direction of the moisture detection needle 3. The direction of the moisture detector in the soil is judged by observing the position of the display 6. The detection results at different positions are displayed in real time on the display 6 to avoid invalid detection. The wire 9 is stored on one side of the column 1 to avoid entanglement with the drive mechanism 5.

[0036] Working Principle: When using this environmental moisture detector, first stand the entire device on the side of the plant body, keeping a certain distance from the plant body. According to the plant type, roughly determine the diffusion range of its root stems, and ensure that the moisture detection needle 3 at the bottom layer can detect the moisture data near the outermost plant root system after it is extended; Then, rotate the first rotating hand wheel 102 to make the column 1 and the spiral blade 2 start to rotate. The spiral blade 2 starts to rotate and move downward and embed into the soil, driving the column 1 and several moisture detection needles 3 on its side to embed into the soil at the same time, until the moisture detection needles 3 on the top layer are all embedded in the soil. Observe the position of the display 6 and make the display 6 face the position of the plant body to further ensure that the moisture detection needles 3 at the bottom are all aligned with the direction of the plant roots. Next, the second rotating hand wheel 103 is rotated. The second rotating hand wheel 103 is rotated clockwise to cause the worm 501 to start rotating clockwise synchronously, driving all the worm wheels 502 to start rotating counterclockwise. The first levers 503 on the inner walls of the worm wheels 502 slide backward along their respective spiral grooves 404, driving each double-layer pipe 4 and the moisture detection needle 3 to slide forward along the limit pipe 101. When the transmission ratio of the worm wheel 502 and the worm 501 is fixed and the rotation cycle is consistent, the design of the decreasing pitch of the spiral groove 404 of the outer pipe 401 allows the moisture detection needle 3 to extend outward in a stepped manner from top to bottom. During the extension process, if one of the moisture detection needles 3 encounters an obstacle, a reverse backward force is generated, and the inner tube 402 immediately begins to be squeezed and retracted along the outer tube 401. The second lever 407 begins to slide along the spiral groove 404, and the inner tube 402 and the moisture detection needle 3 retract and move backward while rotating. The angle of the moisture detection needle 3 at the front changes, and the original motion trajectory is changed to avoid the obstacle. When the moisture detection needle 3 at the front passes through the obstacle, the spiral hook 7 at the rear end is elastically bent by the lateral force when it contacts the obstacle, changing the original path. During this process, it does not affect the other moisture detection needles 3 from continuing to extend outward. Finally, when the double-layer pipe 4 slides to the end of the row, all the double-layer pipes 4 and moisture detection needles 3 pop out. The top layer of moisture detection needles 3 is specifically used to detect the roots directly below the plant body. They are distributed in a stepped manner to achieve segmented detection of the plant roots from top to bottom and from near to far. The detection values ​​are transmitted to the display 6 at the top of the column 1 through the wire 9. The specific detection scheme is common knowledge in this field. After the detection is completed, first rotate the second rotating handwheel 103 in reverse to drive all the moisture detection needles 3 to be retracted into the limiting pipe 101, and then rotate the first rotating handwheel 102 in reverse to pull out the entire device.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An environmental moisture detector for cultivated land in rocky desertification areas, comprising a column (1) and a spiral blade (2) surrounding the outside of the column (1), wherein the spiral blade (2) is fixedly connected to the column (1), characterized in that: It also includes a plurality of moisture detection needles (3) arranged longitudinally on one side of the column (1), a double-layer pipe (4) installed at the end of the moisture detection needle (3) for pushing the moisture detection needle (3) to extend outward in a stepped manner and capable of automatically rotating and displacing to avoid obstacles, and a driving mechanism (5) provided on the double-layer pipe (4) capable of driving the double-layer pipe (4) to move horizontally; A display (6) electrically connected to the moisture detection needle (3) is installed near the top of the column (1).

2. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 1, characterized in that: The double-layer pipe (4) comprises an outer pipe (401) penetrating the column (1), an inner pipe (402) sleeved inside the outer pipe (401), and an extension pipe (403) fixedly connected to the end of the outer pipe (401); A position-limiting pipe (101) is inserted into the side surface of the column (1) at a position corresponding to the outer pipe (401), and a sliding connection is adopted between the outer pipe (401) and the position-limiting pipe (101).

3. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 1, characterized in that: There are a number of double-layer pipes (4) in total, and the double-layer pipes (4) are connected to the moisture detection needles (3) in a one-to-one correspondence, and the length of the double-layer pipes (4) gradually decreases from top to bottom.

4. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 2, characterized in that: A spiral groove (404) is provided on the surface of each outer layer pipe (401), and the pitch of the spiral groove (404) decreases gradually from top to bottom.

5. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 4, characterized in that: The driving mechanism (5) includes a worm (501), a worm wheel (502) meshing with a position on one side of the worm (501) corresponding to the double-layer pipe (4), the worm wheel (502) being sleeved on the outside of the outer pipe (401), and a first shifting rod (503) penetrating the spiral groove (404) being welded to the inner wall of the worm wheel (502), and a rotational connection is formed between the worm wheel (502) and the column (1) via a bearing.

6. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 2, characterized in that: A limiting rod (405) is welded to the inner wall of the extension pipe (403), and a return spring (406) is sleeved on the outside of the limiting rod (405). A sliding connection is adopted between the front end of the limiting rod (405) and the inner pipe (402).

7. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 2, characterized in that: A second lever (407) penetrating the spiral groove (404) is welded to one end of the outer wall of the inner pipe (402) close to the moisture detection needle (3). The second lever (407) slides along the inner wall of the spiral groove (404), driving the inner pipe (402) to rotate and displace along the inner wall of the outer pipe (401), accompanied by compression of the return spring (406).

8. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 1, characterized in that: A spiral hook (7) is inserted into the end of the moisture detection needle (3), and the other end of the spiral hook (7) is fixedly connected to the inner layer pipe (402). A protective shell (8) is sleeved on the outside of the moisture detection needle (3), one side of the protective shell (8) is set as an open structure, and the front end of the protective shell (8) is set as a sawtooth shape.

9. The environmental moisture detector for cultivated land in rocky desertification areas according to claim 1, characterized in that: A first rotating hand wheel (102) is installed at the top of the column (1), a groove is provided on the side of the column (1), and a second rotating hand wheel (103) is provided in the groove, and a fixed connection is adopted between the second rotating hand wheel (103) and the worm (501); One side of the display (6) is electrically connected to one end of a plurality of wires (9), and the other end of the wires (9) passes through the spiral hook (7) and is electrically connected to the moisture detection needle (3).

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