A multi-point soil moisture monitoring device

Abstract

The application discloses a kind of multi-point soil moisture content monitoring devices, it is related to soil moisture content monitoring research technical field, including outer sleeve, inner sleeve, rotating shaft, mode switching mechanism and multiple detection probes;Inner sleeve rotation is connected in outer sleeve, its side wall is equipped with limit through slot and the monitoring window of outer sleeve corresponds;Rotating shaft is locked or separated with inner sleeve by mode switching mechanism;Detection probe is connected with rotating shaft by transmission assembly;By double-cylinder nesting structure, avoid scattered soil into the main rod inner cavity;Detection probe spirally is arranged around rotating shaft, reduce the interference between adjacent detection units, improve measurement independence and precision;By single rotating handle and mode switching mechanism, complete window opening and closing and probe telescopic operation, simultaneously drive all probes to be synchronously horizontally extended, realize the rapid synchronous measurement of multilayer soil moisture content, the application compact structure, operation is convenient, significantly improve the efficiency and reliability of slope engineering in moisture content monitoring.

Description

Technical Field

[0001] This invention relates to the field of soil moisture content monitoring research technology, and more specifically to a multi-point soil moisture content monitoring device. Background Technology

[0002] Soil moisture content refers to the ratio of the mass of water in soil to the mass of dry soil. It directly determines the mechanical properties of the soil, thus affecting the deformation capacity and stability of slopes. Rainfall infiltration is a major factor inducing large deformation disasters such as slope instability. Increased soil moisture content easily leads to a decrease in soil shear strength, posing serious safety risks to slope engineering construction and the surrounding environment. Therefore, long-term and accurate monitoring of soil moisture content, and a thorough understanding of its distribution and changes at different depths of the slope, is an important prerequisite for slope engineering disaster prevention and control.

[0003] Traditional monitoring devices often employ single-point or single-layer measurement methods, making it impossible to simultaneously acquire moisture content data at different depths. Single-point data is insufficient to comprehensively assess the overall stability of the slope and the distribution of the seepage field. Some devices capable of multi-layer measurement have complex structures, often requiring separate drive or sealing mechanisms for each layer's probe. This not only increases manufacturing costs but also makes on-site deployment and measurement operations cumbersome.

[0004] Meanwhile, some devices use a vertically downward-facing sensor probe. During long-term monitoring, the probe is constantly subjected to the weight of the soil and the friction and compression of the deep soil, which can easily cause structural damage and shorten the service life of the equipment.

[0005] Therefore, how to provide a monitoring device that can simultaneously and accurately measure the moisture content of multi-layered soil is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a multi-point soil moisture content monitoring device, which aims to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A multi-point soil moisture content monitoring device includes an outer sleeve, wherein multiple monitoring windows are spirally spaced along the axial direction on the side wall of the outer sleeve; and further includes:

[0009] The inner sleeve is rotatably connected to the inner side of the outer sleeve. The side wall of the inner sleeve has multiple limiting grooves axially formed, and the multiple limiting grooves correspond to multiple monitoring windows respectively.

[0010] A rotating shaft is coaxially arranged inside the inner sleeve. The top of the rotating shaft is rotatably connected to the top of the inner sleeve. A rotating handle is fixedly connected to the top of the rotating shaft, and the rotating handle is located above the top surface of the inner sleeve.

[0011] A mode switching mechanism is installed on the top of the rotating shaft and is used to lock and separate the rotating shaft from the inner sleeve.

[0012] The detection probes are numbered the same as the number of monitoring windows and are all connected to the rotating shaft via a transmission assembly. The detection probes are located within the limiting slot. When the rotating shaft is locked to the inner sleeve, the rotating shaft can drive the inner sleeve to rotate and close the monitoring window. When the rotating shaft is separated from the inner sleeve, the independent rotation of the rotating shaft can cause the transmission assembly to push the detection probes out of the limiting slot and out of the monitoring window.

[0013] Through the above technical solution, this invention discloses a multi-point soil moisture content monitoring device. By integrating the inner sleeve, rotating shaft, mode switching mechanism, and transmission components, it realizes the two core functions of opening and closing the monitoring window and driving the probe measurement on a single device, effectively solving the problems of single function or complex structure of traditional devices. The relative rotation of the inner and outer sleeves is used to open and close the monitoring window, which can effectively prevent loose soil from entering the device when not measuring, protecting the precision transmission components and detection probes, and improving the durability and reliability of the device. By linking all detection probes through a single rotating shaft, it is possible to quickly and synchronously measure the moisture content of soil layers at different depths on the slope, overcoming the limitations of traditional single-point measurement data and reflecting the soil moisture content more comprehensively. Through the mode switching mechanism, the operator only needs to operate a single rotating handle to complete all actions sequentially, greatly simplifying the complexity of field operations and improving work efficiency.

[0014] Preferably, in the aforementioned multi-point soil moisture content monitoring device, the mode switching mechanism includes a locking pin and a locking assembly for controlling the locking pin to engage and lock with the inner sleeve. This concretizes the higher-level mode switching function into a mechanical structure composed of a locking pin and a locking assembly, providing a concrete and feasible technical solution for the reliable connection and separation of power transmission between the rotating shaft and the inner sleeve.

[0015] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, the locking assembly includes two symmetrically arranged L-shaped rods and a spring. The horizontal bar of the L-shaped rod extends horizontally to the outside of the rotating handle and is fixed with a pressing block. The vertical bar of the L-shaped rod extends into the rotating shaft and is fixedly connected to the locking pin. The spring is connected between the two vertical bars. The symmetrically arranged L-shaped rods and pressing blocks constitute the operating part, making the mode switching action clear and definite. The introduction of the spring ensures that the locking pin can be inserted into the inner sleeve in the non-pressed state, realizing the synchronous rotation of the rotating shaft and the inner sleeve. When the fixing block is pressed, the spring is compressed, and the vertical bar of the L-shaped rod drives the locking pin to move radially, causing the locking pin to disengage from the inner sleeve, realizing the independent rotation of the rotating shaft, and thus driving multiple detection probes to extend or retract simultaneously.

[0016] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, there are two locking pins. The two locking pins are fixedly connected to the bottom ends of the two vertical rods respectively. When the two pressing blocks are pressed, the two locking pins are driven to slide radially, thereby separating from the inner sleeve. The symmetrical locking with two locking pins makes the force transmission between the rotating shaft and the inner sleeve more balanced, reducing deformation or shaking that may occur due to single-point force application, and enhancing the rigidity of the locked state. The simultaneous disengagement of the two locking pins ensures smooth mode switching, avoids jamming that may be caused by asynchronous movement of a single locking pin, and improves operational reliability.

[0017] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, each transmission component includes a connecting plate and a connecting rod. Multiple connecting plates are axially spaced and fixed on the rotating shaft. An arc-shaped guide groove is formed on each connecting plate. One end of the connecting rod is fixed with a guide post that is slidably connected to the arc-shaped guide groove, and the other end of the connecting rod is fixedly connected to the detection probe. The sidewall of the detection probe slidably abuts against the wall of the limiting groove. Through the cooperation of the arc-shaped guide groove and the guide post on the connecting plate, the rotational motion of the rotating shaft is accurately and reliably converted into the radial linear motion of the detection probe. The sliding abutment between the wall of the limiting groove and the sidewall of the detection probe strictly restricts the probe's degree of freedom, ensuring that it can only extend and retract horizontally. This avoids the long-term gravity and soil friction experienced by the probe in traditional vertically downward placement methods, significantly extending its service life.

[0018] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, the transmission assembly further includes a limiting block, which is fixed at the opening of the limiting through groove. The connecting rod passes through the limiting hole of the limiting block and is fixedly connected to the detection probe. Adding the limiting block provides the connecting rod with a more precise guide hole with smaller gaps, further reducing the shaking during probe extension and retraction, improving the rigidity and motion synchronization of the entire transmission system, and ensuring the accuracy of the measurement position.

[0019] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, the connecting rod is an insulating rod. Confining the connecting rod as an insulating rod cuts off the electrical path between the mechanical components and the capacitance probe. This effectively prevents short circuits and signal leakage, and avoids interference from parasitic capacitance on sensitive signals.

[0020] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, the detection probe is a capacitive detection probe, and multiple capacitive detection probes are spirally arranged around the axis of rotation. By clearly defining the detection probe as a capacitive sensor and employing a spiral arrangement, a three-dimensional dense distribution of probes is achieved within a limited space, laying the foundation for multi-layer monitoring.

[0021] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, the orientations of the detection probes in adjacent layers are staggered by 90° in the circumferential direction. By staggering the probes in adjacent layers by 90° in the circumferential direction, the physical distance between adjacent probes is maximized, and the relative angle of their electric field directions is changed, thereby greatly reducing the overlap and coupling of their electromagnetic fields, effectively improving the independence of single-point measurements and the accuracy of overall data.

[0022] Preferably, in the above-mentioned multi-point soil moisture content monitoring device, a conical head is fixed to the bottom end of the outer sleeve; a reaction baffle is fixed to the outer wall of the top end of the outer sleeve. The conical head structure can break through the soil like a pile tip, reducing the difficulty and external force required to drive the entire device into the predetermined depth, making the deployment process more convenient; when the handle is rotated to drive the inner sleeve to rotate (opening and closing the window), the reaction baffle provides a reaction force to the outer sleeve through interaction with the surrounding soil, preventing its rotation.

[0023] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a multi-point soil moisture content monitoring device, which has the following beneficial effects:

[0024] 1. This invention integrates the core functions of the device and simplifies the operation process through a double-sleeve nested structure and an integrated mode switching mechanism. The relative rotation of the inner and outer sleeves ensures reliable opening and closing of the monitoring window, effectively preventing soil intrusion; while a single rotating handle controls both the opening / closing of the window and the extension / retraction of the detection probe through mode switching. This design not only solves the drawbacks of complex structure and cumbersome operation of traditional devices, but also significantly reduces the long-term soil stress and friction that the detection probe bears by extending horizontally into the soil only during measurement, thus significantly improving the service life and measurement efficiency of the equipment.

[0025] 2. This invention achieves rapid and synchronous measurement of soil moisture content at different depths on slopes through a linkage design that simultaneously drives all detection probes via a single rotating shaft, overcoming the limitations of traditional single-point measurement data. Crucially, the capacitance detection probes are arranged spirally around the axis, with adjacent probes facing outwards. This design significantly increases the physical distance between probes and alters the electric field direction, effectively reducing electromagnetic field overlap and interference, and ensuring the independence and accuracy of multi-layer measurement data.

[0026] 3. The symmetrically arranged double-locking pin structure of this invention enhances the stability of mode switching and locking rigidity; the limiting slot and insulating connecting rod in the transmission assembly respectively ensure the precise guidance of probe movement and the anti-interference of electrical signals; while the conical head and reaction baffle facilitate the insertion process of the device and provide necessary reaction force support for operation. These features work together to realize an integrated multi-layer soil moisture content monitoring device that is compact in structure, convenient in operation, accurate in measurement, and long in life. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 The attached figure is a schematic diagram of the probe extension state of the multi-point soil moisture content monitoring device provided by the present invention;

[0029] Figure 2 The attached figure is a schematic diagram of the retracted state of the detection probe of the multi-point soil moisture content monitoring device provided by the present invention.

[0030] Figure 3 The attached figure is a schematic diagram of the locking structure between the locking pin and the inner sleeve provided by the present invention;

[0031] Figure 4 The attached figure is a schematic diagram of the structure where the locking pin and the inner sleeve are separated according to the present invention;

[0032] Figure 5 The attached figure is a schematic diagram of the structure of the rotating shaft, transmission assembly, and detection probe provided by the present invention;

[0033] Figure 6 The attached figure is a schematic diagram of the original state of the detection probe provided by the present invention;

[0034] Figure 7 The attached figure is a schematic diagram of the extended state of the detection probe provided by the present invention;

[0035] Figure 8 The attached figure is a top view of the original state of the multiple detection probes provided by the present invention;

[0036] Figure 9 The attached figure is a top view of the extended state of the multiple detection probes provided by the present invention.

[0037] Wherein: 1-Outer sleeve; 11-Monitoring window; 12-Conical head; 13-Reaction baffle; 2-Inner sleeve; 21-Limiting slot; 3-Rotating shaft; 4-Rotating handle; 5-Detection probe; 6-Transmission assembly; 61-Connecting plate; 611-Arc-shaped guide groove; 62-Connecting rod; 621-Guide post; 63-Limiting block; 7-Locking pin; 8-Locking assembly; 81-L-shaped rod; 811-Pressing block; 82-Spring. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Participate in the attached Figure 1 and attached Figure 2 As shown in the figure, this invention discloses a multi-point soil moisture content monitoring device, including an outer sleeve 1, with multiple monitoring windows 11 spirally spaced along its axial direction on the side wall of the outer sleeve 1; it also includes an inner sleeve 2, which is rotatably connected to the inner side of the outer sleeve 1, with multiple limiting grooves 21 axially formed on the side wall of the inner sleeve 2, each limiting groove 21 corresponding to a multiple monitoring window 11; and a rotating shaft 3, which is coaxially arranged inside the inner sleeve 2, with its top rotatably connected to the top of the inner sleeve 2, and a rotating handle 4 fixedly connected to the top of the rotating shaft 3, the rotating handle 4 being located on the top surface of the inner sleeve 2. Above; a mode switching mechanism, which is installed on the top of the rotating shaft 3 and is used to lock and separate the rotating shaft 3 from the inner sleeve 2; detection probes 5, the number of which is the same as the number of monitoring windows 11, and all of which are connected to the rotating shaft 3 through the transmission assembly 6. The detection probes 5 are located in the limiting groove 21: when the rotating shaft 3 is locked to the inner sleeve 2, the rotating shaft 3 can drive the inner sleeve 2 to rotate and close the monitoring window 11; when the rotating shaft 3 is separated from the inner sleeve 2, the independent rotation of the rotating shaft 3 can cause the transmission assembly 6 to push the detection probes 5 out of the limiting groove 21 to the outside of the monitoring window 11.

[0040] In some specific embodiments, as shown in the appendix Figure 3As shown, the mode switching mechanism includes a locking pin 7 and a locking assembly 8 that controls the locking pin 7 to engage and lock with the inner sleeve 2.

[0041] In some other embodiments, the locking assembly 8 includes two symmetrically arranged L-shaped rods 81 and a spring 82. The horizontal bar of the L-shaped rod 81 extends horizontally to the outside of the rotating handle 4 and is fixed with a pressing block 811. The vertical bar of the L-shaped rod 81 extends into the rotating shaft 3 and is fixedly connected to the locking pin 7. The spring 82 is connected between the two vertical bars.

[0042] In specific embodiments, as shown in the appendix Figure 4 As shown, there are two locking pins 7. The two locking pins 7 are fixedly connected to the bottom ends of the two vertical rods respectively. When the two pressing blocks 811 are pressed, the two locking pins 7 are driven to slide radially to separate from the inner sleeve 2.

[0043] like Figure 3 As shown, a groove is provided at the top of the rotating shaft 3, which allows two L-shaped rods 81 to be inserted from the top surface of the rotating shaft 3. The bottom of the groove passes through the side wall of the rotating shaft 3, so that two locking pins 7 extend from the side walls of the rotating shaft 3 respectively, enabling the L-shaped rods 81 and locking pins 7 to achieve stable extension and retraction.

[0044] In a specific example, as shown in the appendix Figure 6 To be continued Figure 9 As shown, each transmission component 6 includes a connecting plate 61 and a connecting rod 62. Multiple connecting plates 61 are axially spaced and fixed on the rotating shaft 3. An arc-shaped guide groove 611 is formed on each connecting plate 61. One end of the connecting rod 62 is fixed with a guide post 621 that is slidably connected to the arc-shaped guide groove 611. The other end of the connecting rod 62 is fixedly connected to the detection probe 5. The sidewall of the detection probe 5 slidably abuts against the wall of the limiting through groove 21. The shape of the connecting plate 61 is as follows: Figure 5 As shown.

[0045] In some examples, such as the attached Figure 7 As shown, the transmission assembly 6 also includes a limiting block 63, which is fixed at the opening of the limiting through groove 21. The connecting rod 62 passes through the limiting hole of the limiting block 63 and is fixedly connected to the detection probe 5.

[0046] More specifically, connecting rod 62 is an insulating rod.

[0047] In some specific examples, the detection probe 5 is a capacitance detection probe, and multiple capacitance detection probes are spirally arranged around the axis of rotation 3.

[0048] More specifically, each detection probe 5 is connected to a cable for signal transmission and power supply. The lines between multiple detection probes 5 are arranged in parallel and combined into a single main cable. All these cables are properly housed and arranged within the internal cavity of the inner sleeve 2, and finally led upwards from the central channel of the rotating shaft 3 or rotating handle 4 to connect to the external data acquisition equipment. This wiring method not only keeps the interior of the device neat, but more importantly, it effectively protects the cables from wear and damage during the device's penetration into the soil and long-term use, ensuring the reliability and stability of the electrical connections.

[0049] In some other embodiments, the orientations of two adjacent detection probes 5 are offset from each other by 90° in the circumferential direction.

[0050] In a specific embodiment, a conical head 12 is fixed at the bottom end of the outer sleeve 1, and a reaction baffle 13 is fixed on the outer side wall of the top end of the outer sleeve 1.

[0051] The implementation of the present invention is as follows: 1. Monitoring window opening and closing mode (initial state of the device, transportation and soil driving).

[0052] like Figure 2 and Figure 3 As shown, the locking assembly 8 is not pressed at this time. The tension of the spring 82 keeps the vertical rods of the two L-shaped rods 81 separated, thereby pushing the two locking pins 7 to move radially outward, so that their outer ends are firmly locked into the locking holes of the inner sleeve 2. At this time, the rotating shaft 3, the locking pins 7 and the inner sleeve 2 are locked into a rigid whole in the circumferential direction.

[0053] When it is necessary to open or close the monitoring window 11, rotate the rotary handle 4. Since all three are locked, the rotational torque is directly transmitted to the inner sleeve 2 through the rotating shaft 3 and the locking pin 7, driving the inner sleeve 2 to rotate relative to the outer sleeve 1. The wall of the inner sleeve 2 then slides over the monitoring window 11 on the outer sleeve 1, thus opening or closing it. During this process, the reaction baffle 13 interacts with the surrounding soil, providing a reaction torque to the outer sleeve 1 to prevent its rotation and ensure effective operation.

[0054] Before driving the device into the soil or after the measurement is completed, keeping the monitoring window 11 closed can effectively prevent soil from entering the device and play a core protective role.

[0055] 2. Moisture content measurement mode.

[0056] Once the device reaches the designated measurement depth and the monitoring window 11 is open, the operator simultaneously presses the two pressing blocks 811 inward (e.g., ...). Figure 4 (As shown).

[0057] The squeezing action drives the two L-shaped rods 81 to move horizontally towards each other against the elastic force of the spring 82. The bottom of the vertical rods of the L-shaped rods 81 then pulls the two locking pins 7 radially inward, causing them to completely disengage from the locking holes of the inner sleeve 2. At this point, the linkage between the rotating shaft 3 and the inner sleeve 2 is released.

[0058] Keep pressing down and rotate the handle 4. At this time, the rotation of the handle 4 no longer drives the inner sleeve 2 (the inner sleeve 2 remains stationary), but instead drives the rotating shaft 3 to rotate freely inside the inner sleeve 2. The rotation of the rotating shaft 3 causes all the connecting plates 61 on it to rotate together.

[0059] The arc-shaped guide groove 611 on the connecting plate 61 rotates accordingly, and through sliding engagement with the guide post 621, converts the rotational motion of the rotating shaft 3 into the radial linear motion of the connecting rod 62 (comparison). Figure 6 The retraction state and Figure 7 (Extended state). Under the linear guidance constraint of the limiting slot 21 and the limiting hole of the limiting block 63, all detection probes 5 are synchronously and horizontally pushed out of the monitoring window 11 and inserted into the surrounding soil to be tested (e.g., Figure 1 and Figure 9 (As shown).

[0060] By energizing the detection probe 5, the dielectric constant of soil layers at different depths can be measured simultaneously, and the moisture content data can then be calculated.

[0061] After the measurement is completed, rotate the handle 4 in the opposite direction to drive the transmission assembly 6 so that all the detection probes 5 retract synchronously into the device. Then release the pressing block 811, and the spring 82 pushes the L-shaped rod 81 and the locking pin 7 to reset, relocking the rotating shaft 3 and the inner sleeve 2. Finally, rotate the handle 4 to close the monitoring window 11, completing one full measurement cycle.

[0062] Through the ingenious structural design described above, this invention enables a single handle to control two core functions, making it easy to operate, highly reliable, and capable of performing multi-layer synchronous and accurate measurements. It also greatly extends the service life of the equipment in complex soil environments.

[0063] It should be noted that the detection probe can be replaced with a detection probe or other detection units according to the actual measurement needs on site, and all such replacements are within the scope of protection of this invention.

[0064] By switching and coordinating the two working modes mentioned above, this device not only achieves simultaneous and accurate measurement of the moisture content of multi-layered soil, but also fully meets the requirements of slope engineering for long-term stability and multi-depth measurement. Its reliable window sealing mechanism and the working method that allows the probe to contact the soil only during measurement greatly reduce the risk of damage to the equipment during long-term burial; while the multi-probe synchronous measurement design arranged spirally along the depth direction can acquire continuous data reflecting the spatial distribution of soil moisture from shallow to deep in one go, providing a solid data foundation for slope stability analysis and early warning.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-point soil moisture monitoring device comprising an outer sleeve (1) having a plurality of monitoring windows (11) spaced helically along the axial side wall thereof; characterised in that, Also include: The inner sleeve (2) is rotatably connected inside the outer sleeve (1), the side wall of the inner sleeve (2) is axially provided with a plurality of limiting through grooves (21), and a plurality of limiting through grooves (21) correspond to a plurality of monitoring windows (11) respectively; Rotary shaft (3), the rotary shaft (3) is coaxially arranged inside the inner sleeve (2), the top of the rotary shaft (3) is rotatably connected with the top of the inner sleeve (2), the top end of the rotary shaft (3) is fixedly connected with a rotary handle (4), and the rotary handle (4) is located above the top surface of the inner sleeve (2); Mode switching mechanism, the mode switching mechanism is installed on the top of the rotary shaft (3), and is used for realizing the locking and separation of the rotary shaft (3) and the inner sleeve (2); Detection probe (5), the number of detection probe (5) is same with the number of monitoring window (11), and is connected on the rotary shaft (3) through transmission assembly (6), the detection probe (5) is located in the limiting through groove (21): when the rotary shaft (3) is locked with the inner sleeve (2), the rotary shaft (3) can drive the inner sleeve (2) to rotate to close the monitoring window (11); when the rotary shaft (3) is separated from the inner sleeve (2), the independent rotation of the rotary shaft (3) can make the transmission assembly (6) push the detection probe (5) out of the limiting through groove (21) to the outside of the monitoring window (11); The mode switching mechanism includes a locking pin (7), and a locking assembly (8) for controlling the locking of the locking pin (7) and the inner sleeve (2); The locking assembly (8) includes two symmetrically arranged L-shaped rod bodies (81) and a spring (82), the horizontal rod of the L-shaped rod body (81) extends to the outside of the rotary handle (4) and is fixedly connected with a pressing block (811), the vertical rod of the L-shaped rod body (81) extends into the rotary shaft (3) and is fixedly connected with the locking pin (7), and the spring (82) is connected between the two vertical rods; The number of locking pins (7) is two, and the two locking pins (7) are fixedly connected with the bottom ends of the two vertical rods respectively, when the two pressing blocks (811) are pressed, the two locking pins (7) are driven to slide radially to realize the separation with the inner sleeve (2); The detection probe (5) is a capacitive detection probe, and a plurality of capacitive detection probes are arranged spirally around the axis direction of the rotary shaft (3); The directions of the detection probes (5) of two adjacent layers are staggered by 90° in the circumferential direction. Each of the transmission assemblies (6) comprises a connecting plate (61) and a connecting rod (62), a plurality of the connecting plates (61) are fixed on the rotating shaft (3) in an axial interval, and an arc-shaped guide groove (611) is formed on the connecting plate (61); one end of the connecting rod (62) is fixed with a guide column (621) which is in sliding connection with the arc-shaped guide groove (611), and the other end of the connecting rod (62) is fixedly connected with the detection probe (5); the side wall of the detection probe (5) is in sliding abutment with the groove wall of the limiting through groove (21).

2. The multipoint soil moisture monitoring device of claim 1, wherein, The transmission assembly (6) further comprises a limiting block (63), the limiting block (63) is fixed at the slot opening of the limiting through groove (21), and the connecting rod (62) is fixedly connected with the detection probe (5) through the limiting hole of the limiting block (63).

3. The multipoint soil moisture monitoring device of claim 1, wherein, The connecting rod (62) is an insulating rod.

4. The multipoint soil moisture monitoring device of claim 1, wherein, The bottom end of the outer sleeve (1) is fixed with a conical head (12), and the outer side wall of the top end of the outer sleeve (1) is fixed with a counterforce baffle (13).

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