Self-driven landslide pore water pressure sensor

Abstract

The utility model provides a self-driven landslide pore water pressure sensor, which relates to the technical field of mechanical instruments and comprises a shell and at least one detection probe arranged in the shell. The detection probe comprises a tray, a sliding rod, a plurality of nano friction rings, a metal friction ring and an elastic piece, the tray is slidably arranged on the surface of the shell, one end of the sliding rod is connected with the tray, the other end of the sliding rod is connected with the elastic piece, the other end of the elastic piece is fixedly arranged, and the sliding rod is sleeved with the nano friction rings at intervals; the metal friction ring is fixedly arranged on the periphery of one nanometer friction ring. The device has the beneficial effects that the device can be directly buried in soil, when pore water pressure acts on the detection probe, the tray can be extruded to slide towards the interior of the shell, the sliding rod is driven to slide to enable each nano friction ring to move and further to be in contact with the metal friction ring and generate electricity through friction, and charge change can be used as a detection signal of the pore water pressure; and the pore water pressure is accurately calculated.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical instruments, in particular to a self-driven landslide pore water pressure sensor. Background Art

[0002] Landslide monitoring is an important link in geological disaster prevention. Among them, monitoring the pore water pressure in the landslide area is one of the keys. Pore water pressure refers to the pressure generated by pore water in soil or rock, which plays a crucial role in the process of landslide occurrence. When the pore water pressure is too high, it may lead to a decrease in the stability of the soil mass, thus triggering a landslide. Therefore, monitoring the pore water pressure is of great significance for preventing and predicting landslides.

[0003] At present, the commonly used pore water pressure monitoring method is mainly the piezometer method. A piezometer is a sensor specifically used to measure seepage water or static pressure, suitable for various civil engineering application scenarios, such as buildings, railways, transportation, hydropower dams, tunnels, etc. It has excellent anti-interference ability, long-term stability and sealing performance, and can work normally in various harsh environments. However, the piezometer requires manual data reading at regular intervals and cannot achieve real-time monitoring. Therefore, it is of great practical significance to develop a new type of, simple-to-use, self-powered sensor that can monitor the pore water pressure of landslides in real time. Summary of the Utility Model

[0004] In view of this, in order to solve the detection of soil internal pore water pressure during landslide monitoring, an embodiment of the utility model provides a self-driven landslide pore water pressure sensor.

[0005] An embodiment of the utility model provides a self-driven landslide pore water pressure sensor, including a housing and at least one detection probe disposed in the housing;

[0006] The detection probe includes a tray, a sliding rod, a plurality of nano friction rings, a metal friction ring and an elastic member. The tray is slidably disposed on the surface of the housing. The sliding rod is disposed along the sliding direction of the tray, with one end connected to the tray and the other end connected to the elastic member. The other end of the elastic member is fixedly disposed. Each nano friction ring is sleeved on the sliding rod at intervals, and the metal friction ring is fixedly disposed around one of the nano friction rings. When the tray slides towards the inside of the housing, it pushes the sliding rod to drive the nano friction ring to generate electricity by friction with the metal friction ring to generate a detection signal.

[0007] Further, the detection probe further includes a cylinder with both ends closed. The metal friction ring is fixedly disposed in the middle of the cylinder. The elastic member is fixed to the bottom of the cylinder. The upper end of the sliding rod slidably penetrates the upper end of the cylinder and extends to the lower side of the metal friction ring and is connected to the elastic member.

[0008] Further, the lower end of the sliding rod is connected to the chassis, and the chassis is located below the metal friction ring and blocked by the metal friction ring.

[0009] Further, the lower end of the elastic member is connected to the base, a limiting ring is provided at the lower end of the cylinder body, and the base is embedded in the lower port of the cylinder body and connected to the limiting ring.

[0010] Further, the elastic member is a spring, and the spring is coaxially arranged with the cylinder body.

[0011] Further, the detection probe further includes a fixing plate, the lower end of the cylinder body is fixedly connected to the fixing plate, and the fixing plate is fixed inside the housing.

[0012] Further, the housing has a plurality of side surfaces, and each detection probe is arranged in the vertical direction of one of the side surfaces.

[0013] Further, the shape of the housing is a cuboid, and the number of the detection probes is six.

[0014] Further, a guiding cylinder is provided on the surface of the housing, a semi-permeable membrane is provided at the outer port of the guiding cylinder, and the tray is embedded in the guiding cylinder and can slide axially along the guiding cylinder.

[0015] Further, the material of the nano friction ring is a polyimide film, and the material of the metal friction ring is aluminum.

[0016] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows:

[0017] 1. For a self-powered landslide pore water pressure sensor of the present invention, it can be directly buried in the soil. When the pore water pressure in the soil changes due to rainfall or other factors, when the pore water pressure acts on the detection probe, it will squeeze the tray to slide towards the inside of the housing, drive the sliding rod to slide, and make each nano friction ring move, and then contact and generate electricity by friction with the metal friction ring, resulting in a charge change. The magnitude of the charge change is proportional to the contact area between the nano friction ring and the metal friction ring. Thus, the charge change can be used as the detection signal of the pore water pressure, and the magnitude of the pore water pressure can be accurately calculated.

[0018] 2. For a self-powered landslide pore water pressure sensor of the present invention, the nano friction rings are sleeved on the sliding rod at intervals to form a stacked structure. When the pore water pressure acts on the tray, the contact between the nano friction ring and the metal friction ring is periodic, making the charge transfer have a periodic law. Thus, the change rate of the pore water pressure can be obtained, and the change rate of the pore water pressure can be monitored, which more intuitively reflects the landslide situation.

[0019] 3. The self-powered landslide pore water pressure sensor of the present utility model can generate electric energy through the contact friction between the nano friction ring and the metal friction ring to power the sensor, has the function of self-power supply, does not need to consider the problems of batteries and environmental pollution, and is more suitable for the landslide environment. Description of the Drawings

[0020] Figure 1 is a schematic diagram of a self-powered landslide pore water pressure sensor of the present utility model;

[0021] Figure 2 is the front view of the detection probe;

[0022] Figure 3 is Figure 2 the schematic cross-sectional view A-A in

[0023] Figure 4 is the internal structure diagram of the detection probe;

[0024] Figure 5 is the cross-sectional view of the cylinder;

[0025] Figure 6 is the schematic diagram of the fixing plate;

[0026] Figure 7 is the working schematic diagram of a self-powered landslide pore water pressure sensor of the present utility model.

[0027] In the figure: 1. Outer shell; 101. Guide cylinder; 102. Semi-permeable membrane; 2. Detection probe; 201. Tray; 202. Slide bar; 203. Cylinder; 204. Nano friction ring; 205. Metal friction ring; 206. Elastic member; 207. Chassis; 208. Base; 209. Slide hole; 210. Limit ring; 211. Fixing plate; 212. Fixing hole. Detailed Embodiments

[0028] To make the objectives, technical solutions and advantages of the present utility model clearer, the embodiments of the present utility model will be further described below in conjunction with the drawings. What is introduced below is a relatively superior one among multiple possible embodiments of the present utility model, aiming to provide a basic understanding of the present utility model, but not aiming to identify the key or decisive elements of the present utility model or limit the scope to be protected.

[0029] In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0030] For technologies, methods and devices known to those of ordinary skill in the relevant fields, they may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the description.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the figures are not drawn in actual proportional relationship.

[0032] In the description of the present utility model, it should be noted that the circuits, electronic components and modules involved in the present utility model are all prior arts, which can be fully realized by those skilled in the art without further elaboration. The content protected by the present utility model does not involve improvements to the internal structure and method either.

[0033] Furthermore, it should be noted that unless otherwise clearly defined and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] Please refer to Figure 1 and 7 , an embodiment of the present utility model provides a self-driven landslide pore water pressure sensor, which is applied to the detection of the pore water pressure inside the soil during landslide monitoring, and mainly includes a housing 1 and at least one detection probe 2 disposed in the housing 1.

[0035] Each of the detection probes 2 can detect the pore water pressure in one direction (such as the arrow direction in Figure 7 ), and the number of the detection probes 2 can be flexibly set according to the actual detection needs of the pore water pressure. Generally, the housing 1 has a plurality of side surfaces, and each of the detection probes 2 is disposed in the vertical direction of one of its side surfaces.

[0036] In some embodiments, the shape of the housing 1 is a cuboid, and the number of the detection probes 2 is six. Each of the detection probes 2 is disposed in the vertical direction of one of its side surfaces, so that the pore water pressure in six directions of up, down, left, right, front and back can be detected. Although the shape of the housing 1 is set as a cuboid here, in other embodiments, the housing 1 can also be set as other shapes such as a polyhedron.

[0037] Please refer to Figure 2 , 3 and 4, each of the detection probes 2 includes a tray 201, a slide bar 202, a plurality of nano friction rings 204, a metal friction ring 205 and an elastic member 206.

[0038] Wherein the tray 201 is slidably arranged on the surface of the housing 1. Specifically, a guiding cylinder 101 is provided on the surface of the housing 1, a semi-permeable membrane 102 is provided at the outer port of the guiding cylinder 101, and the tray 201 is embedded in the guiding cylinder 101 and can slide axially along the guiding cylinder 101. The semi-permeable membrane 102 allows water to pass through and blocks the soil from passing through, so that the pore water pressure generated by the water acts on the tray 201.

[0039] The sliding rod 202 is arranged along the sliding direction of the tray 201, one end is connected to the tray 201, the other end is connected to the elastic member 206, the other end of the elastic member 206 is fixedly arranged, each nano friction ring 204 is sleeved on the sliding rod 202 at intervals, the metal friction ring 205 is fixedly arranged on the periphery of one of the nano friction rings 204, the nano friction ring 204 is fixedly connected to the sliding rod 202, and when the sliding rod 202 slides, it can drive at least one nano friction ring 204 to contact the metal friction ring 205.

[0040] It should be noted that the nano friction rings 204 can be flexibly set to multiple according to actual detection needs. For example, the number of nano friction rings 204 in this embodiment is ten. Generally, each nano friction ring 204 is sleeved on the sliding rod 202 at uniform intervals, so that the number of nano friction rings 204 contacting the metal friction ring 205 is proportional to the magnitude of the pore water pressure.

[0041] The materials of the nano friction ring 204 and the metal friction ring 205 can be flexibly selected according to the two friction materials constituting the triboelectric nanogenerator. For example, the material of the nano friction ring 204 in this embodiment is polyimide film (kapton), and the material of the metal friction ring 205 is aluminum.

[0042] Please refer to Figure 5 , in some embodiments, the detection probe 2 further includes a cylinder body 203 with both ends closed. The cylinder body 203 is coaxially arranged with the guiding cylinder 101 and is located in the extending direction of the guiding cylinder 101. A sliding hole 209 is provided at the top of the cylinder body 203, the metal friction ring 205 is fixedly arranged in the middle of the cylinder body 203, the elastic member 206 is fixed at the bottom of the cylinder body 203, the upper end of the sliding rod 202 can slidably penetrate through the sliding hole 209, and the lower end extends below the metal friction ring 205 and is connected to the elastic member 206. Here, the lower end of the sliding rod 202 is connected to a chassis 207, the diameter of the chassis 207 is larger than the inner diameter of the metal friction ring 205, the chassis 207 is located below the metal friction ring 205, and the upward movement of the chassis 207 is blocked by the metal friction ring 205.

[0043] In some embodiments, the lower end of the elastic member 206 is connected to the base 208. A limiting ring 210 is provided at the lower end of the cylinder 203. The base 208 is embedded in the lower port of the cylinder 203 and connected to the limiting ring 210. The base 208 and the limiting ring 210 are fixedly connected by bolts, so that the base 208 closes the lower port of the cylinder 203 and fixes the elastic member 206.

[0044] In some other embodiments, the elastic member 206 is a spring, and the spring is coaxially arranged with the cylinder 203. The base 208 is in a disc shape. The upper end of the spring is fixedly connected to the chassis 207, and the lower end is fixedly connected to the base 208. The sliding of the sliding rod 202 can drive the spring to expand and contract through the chassis 207.

[0045] Please refer to Figure 6 , in some other embodiments, the detection probe 2 further includes a fixing plate 211. A fixing hole 212 is provided on the fixing plate 211. The lower end of the cylinder 203 is bolted to the fixing hole 212, so that the lower end of the cylinder 203 is fixedly connected to the fixing plate 211. The fixing plate 211 is arranged in the housing 1, and the side of the fixing plate 211 is fixedly connected to the inner wall of the housing 1, so that the detection probe 2 is fixed in the housing 1 through the fixing plate 211.

[0046] Please refer to Figure 7 , a self-driven landslide pore water pressure sensor of the present utility model can be applied to detect the pore water pressure inside the soil during landslide monitoring:

[0047] The self-driven landslide pore water pressure sensor is buried in the soil. When the pore water pressure in the soil changes due to rainfall or other factors, all the detection probes 2 or some of the detection probes 2 are affected by the pore water pressure. The tray 201 of each detection probe 2 slides towards the inside of the housing 1 under the action of the pore water pressure, driving the sliding rod 202 to slide and making each nano friction ring 204 move, and then contacting and rubbing with the metal friction ring 205 to generate electricity by friction. The nano friction ring 204 is negatively charged, and the metal friction ring 205 is positively charged, resulting in a charge change. The magnitude of the charge change is proportional to the contact area between the nano friction ring 204 and the metal friction ring 205. Thus, the charge change can be used as a detection signal for the pore water pressure to accurately calculate the magnitude of the pore water pressure.

[0048] And in each of the detection probes 2, the nano friction rings 204 are sleeved on the sliding rods 202 at intervals to form a stacked structure. When pore water pressure acts on the tray 201, the contact between the nano friction rings 204 and the metal friction rings 205 is periodic, so that the charge transfer has a periodic law. Thus, the change rate of the pore water pressure can be obtained, and the change rate of the pore water pressure can be monitored, which more intuitively reflects the landslide situation. When the tray 201 slides towards the inside of the housing 1, the sliding rod 202 is pushed to drive the nano friction ring 204 to generate detection signals by friction with the metal friction ring 205.

[0049] In this article, the front, back, up, down and other orientation words are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different usage and placement methods. The use of the orientation words should not limit the scope of protection claimed in this application.

[0050] Without conflict, the above-mentioned embodiments and the features in the embodiments in this article can be combined with each other. The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-driven landslide pore water pressure sensor, characterized in that: It includes a housing and at least one detection probe disposed within the housing; The detection probe includes a tray, a sliding rod, a plurality of nano friction rings, a metal friction ring, and an elastic member. The tray is slidably disposed on the surface of the housing. The sliding rod is arranged along the sliding direction of the tray, with one end connected to the tray and the other end connected to the elastic member. The other end of the elastic member is fixedly arranged. Each of the nano friction rings is sleeved on the sliding rod at intervals. The metal friction ring is fixedly arranged around one of the nano friction rings. When the tray slides towards the inside of the housing, it pushes the sliding rod to drive the nano friction ring to generate detection signals by friction with the metal friction ring.

2. The self-driven landslide pore water pressure sensor according to claim 1, characterized in that: The detection probe further includes a cylinder with closed ends. The metal friction ring is fixedly arranged in the middle of the cylinder. The elastic member is fixed at the bottom of the cylinder. The upper end of the sliding rod slidably penetrates the upper end of the cylinder and extends to the lower side of the metal friction ring and is connected to the elastic member.

3. The self-driven landslide pore water pressure sensor according to claim 2, wherein: The lower end of the sliding rod is connected to a chassis. The chassis is located below the metal friction ring and is blocked by the metal friction ring.

4. The self-driven landslide pore water pressure sensor according to claim 2 or 3, characterized in that: The lower end of the elastic member is connected to a base. A limiting ring is provided at the lower end of the cylinder. The base is embedded in the lower port of the cylinder and is connected to the limiting ring.

5. The self-driven landslide pore water pressure sensor according to claim 4, characterized in that: The elastic member is a spring. The spring is coaxially arranged with the cylinder.

6. The self-driven landslide pore water pressure sensor according to claim 2, characterized in that: The detection probe further includes a fixing plate. The lower end of the cylinder is fixedly connected to the fixing plate. The fixing plate is fixed within the housing.

7. The self-driven landslide pore water pressure sensor according to claim 1, wherein: The housing has a plurality of sides. Each detection probe is arranged in the vertical direction of one of its sides.

8. The self-driven landslide pore water pressure sensor according to claim 7, characterized in that: The shape of the housing is a cuboid, and the number of detection probes is six.

9. The self-driven landslide pore water pressure sensor according to claim 1, wherein: A guiding cylinder is provided on the surface of the housing. A semi-permeable membrane is provided at the outer port of the guiding cylinder. The tray is embedded in the guiding cylinder and can slide axially along the guiding cylinder.

10. The self-driven landslide pore water pressure sensor according to claim 1, wherein: The material of the nano friction ring is polyimide film, and the material of the metal friction ring is aluminum.

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