A piezometer for reservoir and dam safety monitoring

Abstract

The present invention discloses a piezometer for monitoring the safety of reservoir dams, which relates to the field of safety monitoring technology. The piezometer comprises an outer shell that provides protection, a water seepage hole arranged at the end of the outer shell, a diaphragm for detecting and judging water pressure, an electromagnetic coil for detecting the vibration frequency of a steel string connected to the diaphragm, and a tension adjustment mechanism for detecting and adjusting the tension of the steel string in real time to ensure detection accuracy. This solution adds a tension adjustment mechanism to the end of the steel string, which can detect the tension of the steel string in real time. When the tension of the steel string is affected by external factors or changes in its own conditions, the tension can be adjusted in real time to ensure the stability of the steel string during subsequent use. Secondly, considering the basic principle of using the steel string for detection, it is necessary to consider the fixation and movement of the end. This solution simultaneously ensures the real-time adjustment and fixation of the steel string according to actual needs, thereby ensuring that the steel string can work correctly.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, and in particular to a piezometer for safety monitoring of reservoir dams. Background Art

[0002] During the long-term use of reservoir dams, seepage is one of the important factors affecting the safety of the dam. By controlling the seepage of the dam within a certain range, the service life of the dam can be effectively extended. Monitoring the seepage pressure of the dam pores is one of the means to observe the seepage phenomenon of the dam.

[0003] When monitoring seepage pressure in a dam, monitoring holes are typically drilled into the dam, where piezometers are installed. Vibrating-wire piezometers, due to their high sensitivity and long-term stability, are widely used in water conservancy projects and geological disaster monitoring. During testing, water pressure acts on a highly sensitive metal film, causing it to deform, which in turn affects the tension in the wire. This tension is closely related to its vibration frequency. Therefore, by measuring the frequency of the wire after the tension changes, the seepage pressure can be calculated. However, in practice, the wire itself also experiences fatigue due to long-term vibration. Much like a rubber band that is repeatedly stretched, it loses its elasticity over time, causing the tension between the wire and the fixed end to change (i.e., the tension changes. If the tension changes, the frequency and amplitude of the vibration will change under the same force). This causes the vibration frequency to change, leading to zero drift. Summary of the Invention

[0004] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too simple and provides a solution that is significantly different from the existing technologies. An embodiment of the present invention provides a piezometer for reservoir dam safety monitoring to solve the technical problem that the steel strings in the existing vibrating string piezometers become less tensile and cause the vibration frequency to change due to elastic fatigue after long-term use.

[0005] The embodiment of the present invention adopts the following technical solution: a piezometer for monitoring the safety of reservoir dams, including an outer shell that provides protection, a water seepage hole arranged at the end of the outer shell, a diaphragm for detecting and judging water pressure, an electromagnetic coil for detecting the vibration frequency of a steel string connected to the diaphragm, and a tension adjustment mechanism for detecting and adjusting the tension of the steel string in real time to ensure detection accuracy.

[0006] Furthermore, the tension adjustment mechanism includes a connecting shell, which is arranged in the shell body, the steel string passes through the connecting shell and its end is connected to the matching plate, the matching plate is located in the connecting shell, a friction block is provided at a recessed position on the inner wall of the connecting shell, a matching plate is provided on one side of the matching plate, a limiting electric telescopic rod is provided on the matching plate, a friction head is provided at the movable end of the limiting electric telescopic rod, the friction head corresponds to the position of the friction block, multiple limiting electric telescopic rods are controlled by a controller, a socket base is provided on the other side of the matching plate, the socket base is connected to the inner wall of the connecting shell, a movable block is provided on the connecting shell, the connecting shell and the movable block are movably socketed and connected, an electromagnetic block is provided on the opposite walls of the connecting shell and the movable block, a pressure sensing ring is provided on the movable block, a plurality of pressure sensors are provided on the pressure sensing ring, the pressure sensing ring contacts the matching plate, and the limiting block and the connecting shell are connected via a connecting column.

[0007] Furthermore, the diaphragm is made of a highly sensitive metal film.

[0008] Furthermore, the steel string is made of high-strength steel.

[0009] Furthermore, the magnetic poles of the electromagnetic block provided on the movable block and the electromagnetic block provided on the inner wall of the connecting shell repel each other.

[0010] Furthermore, the position of the mating plate is limited by a limiting block and a pressure sensing ring.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] Firstly, the osmometer uses the resistance between the steel string and the pressure sensing ring to determine the real-time tension of the steel string during use. When the pressure sensing ring senses the change in the pressure acting on it, it will use the effect of magnetic repulsion to push it, thereby adjusting the tension of the steel string. During the vibration of the steel string, its tension is the key parameter to ensure the same vibration rate. Therefore, this case is mainly used to adjust the tension of the steel string. Secondly, considering that the steel string material used in existing vibrating string osmometers is generally relatively strong, and the size of the osmometer is relatively small, it is often difficult to achieve the desired effect by gravity traction. To adjust the steel string, secondly, when gravity traction is used, it is difficult to ensure that the weight of the gravity ball will not change after long-term use (such as oxidation). In this solution, the magnetic repulsion characteristics of the two electromagnetic coils are used to ensure its stability, and its tension is monitored and judged in real time during use. Compared with the gravity ball (the change of its tension is often static, resulting in no obvious deformation trend, and the use of the gravity ball is not convenient for adjustment for subtle deformation, this solution judges through the mutually conflicting forces, and the detection is more stable and accurate);

[0013] Secondly, compared with the existing method of adjusting the steel strings, the non-completely fixed connection is adopted for the end of the steel string, which not only ensures the function of adjustment, but also ensures that the movable connection can be converted into a fixed connection. The fixed connection is to ensure that the matching plate actually connected to the end of the steel string can be moved during actual use, and its position is limited by the front and rear limiters, so as to ensure the normal use of the steel string. The existing solution may adjust the gravity of the steel string by pulling, but the steel string will pull on the left and right sides during the vibration process. Therefore, the adjustable end needs to be fixed during use, otherwise it will cause the vibration rate of the steel string to change during vibration, thereby affecting the accuracy of the inspection;

[0014] To sum up, this solution adds a tension adjustment mechanism to the end of the steel string, which can detect the tension of the steel string in real time. When the tension of the steel string is affected by external factors or its own conditions change, its tension can be adjusted in real time to ensure the stability of the steel string during later use. Secondly, during use, considering the basic principle of using the steel string for detection, it is necessary to consider the fixation and movement of the end. This case simultaneously ensures the real-time adjustment and fixation of the steel string according to actual needs, thereby ensuring that the steel string can work correctly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0017] Figure 2 It is a schematic cross-sectional view of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the outer shell of the present invention from a first perspective;

[0019] Figure 4 This is a schematic diagram of the structure of the interior of the outer shell of the present invention from a second viewing angle;

[0020] Figure 5 Schematic diagram of the tension adjustment mechanism of the present invention;

[0021] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle.

[0022] Reference numerals:

[0023] 1. Outer shell; 11. Water seepage hole; 12. Diaphragm; 13. Steel string; 14. Coil; 2. Tension adjustment mechanism; 21. Connecting shell; 22. Movable block; 23. Electromagnetic block; 24. Pressure sensing ring; 25. Connecting base; 26. Limiting block; 27. Connecting column; 28. Matching plate; 29. ​​Friction block; 210. Limiting electric telescopic rod. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0026] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] The following combination Figures 1 to 6As shown, an embodiment of the present invention provides a piezometer for monitoring the safety of reservoir dams, comprising an outer shell 1 for providing protection, a water seepage hole 11 arranged at the end of the outer shell 1, a diaphragm 12 for detecting and judging water pressure, an electromagnetic coil 14 for detecting the vibration frequency of a steel string 13 connected to the diaphragm 12, and a tension adjustment mechanism 2 for detecting and adjusting the tension of the steel string 13 in real time to ensure detection accuracy.

[0030] During operation, this solution adds a tension adjustment mechanism 2 to the end of the steel string 13, which can detect the tension of the steel string 13 in real time. When the tension of the steel string 13 is affected by external factors or its own conditions change, its tension can be adjusted in real time to ensure the stability of the steel string 13 in the later use process. Secondly, during use, considering the basic principle of using the steel string 13 for detection, it is necessary to consider the fixation and movement of the end. This solution simultaneously ensures the real-time adjustment and fixation of the steel string 13 according to actual needs, thereby ensuring that the steel string 13 can work correctly.

[0031] Specifically, the tension adjustment mechanism 2 includes a connecting shell 21, the connecting shell 21 is arranged in the outer shell 1, the steel string 13 passes through the connecting shell 21 and its end is connected to the matching plate 28, the matching plate 28 is located in the connecting shell 21, a friction block 29 is provided at a recessed position on the inner wall of the connecting shell 21, a matching plate 28 is provided on one side of the matching plate 28, a limiting electric telescopic rod 210 is provided on the matching plate 28, and a friction head is provided at the movable end of the limiting electric telescopic rod 210, and the friction head corresponds to the position of the friction block 29, and a plurality of limiting electric telescopic rods 210 are provided. Controlled by the controller, a socket base 25 is provided on the other side of the matching plate 28, and the socket base 25 is connected to the inner wall of the connecting shell 21. A movable block 22 is provided on the connecting shell 21, and the connecting shell 21 and the movable block 22 are movably socketed and connected. An electromagnetic block 23 is provided on the opposite walls of the connecting shell 21 and the movable block 22. A pressure sensing ring 24 is provided on the movable block 22, and a plurality of pressure sensors are provided on the pressure sensing ring 24. The pressure sensing ring 24 contacts the matching plate 28, and the limiting block 26 is connected to the connecting shell 21 through a connecting column 27.

[0032] Specifically, the diaphragm 12 is made of a highly sensitive metal film.

[0033] During operation, the diaphragm 12 is made of a highly sensitive metal diaphragm 12 , thereby ensuring its service life and stability during use.

[0034] Specifically, the steel string 13 is made of high-strength steel.

[0035] During operation, the steel string 13 is made of high-strength steel to ensure its service life and stability during use.

[0036] Specifically, the magnetic poles of the electromagnetic block 23 provided on the movable block 22 and the electromagnetic block 23 provided on the inner wall of the connecting shell 21 repel each other.

[0037] During operation, the principle of magnetic repulsion can be used to push the movable block 22, and the pressure sensor in the pressure sensing ring 24 on the movable block 22 contacts the matching plate 28. Therefore, the interaction force between the pressure sensing ring 24 and the matching plate 28 can be changed. Since the steel string 13 is connected to the matching plate 28, the effect of adjusting the steel string 13 can be achieved in disguise.

[0038] Working Principle: When using the vibrating wire osmometer, the vibrating wire osmometer is first assembled and then tested to determine its initial vibration rate. During the test, water is first infiltrated through the water seepage hole 11 to contact the diaphragm 12. The appropriate water pressure is selected to act on the highly sensitive metal film, causing it to deform, which in turn affects the tension of the steel string 13. The tension of the steel string 13 is closely related to its vibration frequency. Therefore, the vibration frequency of the steel string 13 after the tension change is measured. When the steel string vibrates, since the steel string 13 is located between the two electromagnetic coils 14, when the steel string 13 vibrates under the action of external pressure, the steel string 13 will cut the magnetic flux lines generated by the magnetic coil 14, or in other words, the magnetic field around the steel string 13 will change due to the vibration of the steel string 13. According to the principle of electromagnetic induction, an induced electromotive force is generated in the magnetic coil 14, and the magnetic coil 14 converts the mechanical vibration of the steel string 13 into an electrical signal. The frequency and amplitude of this electrical signal correspond to the vibration frequency and amplitude of the steel string 13.Subsequently, by amplifying, filtering, shaping, and other processing of the electrical signal, the vibration frequency of the steel string 13 can be accurately measured, and then the pressure value acting on the piezometer can be calculated based on the pre-calibrated relationship to calculate the osmotic pressure. This change value is used as the reference value. After the test is completed, it is placed at the position where the osmotic pressure test is required. When the water pressure is too high, the electrical signal caused by the vibration of the steel string 13 will change, which indicates that the water pressure is too high. In order to ensure the detection accuracy of the steel string 13, the steel string 13 needs to be kept taut at all times. Over time, the tension of the steel string 13 will change, resulting in a decrease in the pulling force of the steel string 13 on the matching plate 28 set at the end. When the pulling force is reduced, the resistance between the matching plate 28 and the pressure sensor in the pressure sensing ring 24 will be reduced, which indicates that the tension of the steel string 13 is reduced. For this reason, it needs to be adjusted. The pressure sensor generates a signal to the processor, and the processor then transmits the converted electrical signal to the limiting electric telescopic rod 210 and the socket base 25 respectively. The electromagnetic block 23 inside the limiting electric telescopic rod 210 works first, and its movable end contracts, causing the friction head connected to the movable end of the limiting electric telescopic rod 210 to break contact with the friction block 29, thereby limiting the position of the contact block 26. The magnetic force in the electromagnetic block 23 increases, and by utilizing the principle of negative repulsion, it has a pushing effect on the movable block 22. Since the movable block 22 is in contact with the matching plate 28, it can push the matching plate 28. The movement of the matching plate 28 can adjust the tension of the steel string 13 until the contact force between the pressure sensor and the matching plate 28 reaches a specified range. At this time, it means that the tension adjustment of the steel string 13 is completed (the steel string 13 is tightened to a certain degree). At this time, the processor sends a signal to the limiting electric telescopic rod 210, resetting the movable end of the limiting electric telescopic rod 210 and fixing its position to ensure stability in use. The electromagnetic block 23 does not move the magnetic force, ensuring the mutual repulsion between them. When the adjusted repulsive force reaches a certain level, the piezometer needs to be replaced.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A piezometer for monitoring reservoir dam safety, comprising an outer shell (1) for providing protection, characterized in that; It also includes a water seepage hole (11) provided at the end of the outer shell (1), a diaphragm (12) for detecting and judging water pressure, an electromagnetic coil (14) for detecting the vibration frequency of a steel string (13) connected to the diaphragm (12), and a tension adjustment mechanism (2) for detecting and adjusting the tension of the steel string (13) in real time to ensure detection accuracy; The tension adjustment mechanism (2) includes a connecting shell (21) and a limiting block (26), the connecting shell (21) is arranged in the outer shell body (1), the steel string (13) passes through the connecting shell (21) and its end is connected to the matching plate (28), the matching plate (28) is located in the connecting shell (21), a friction block (29) is provided at a recessed position of the inner wall of the connecting shell (21), a matching plate (28) is provided on one side of the matching plate (28), a limiting electric telescopic rod (210) is provided on the matching plate (28), a friction head is provided at the movable end of the limiting electric telescopic rod (210), the friction head corresponds to the position of the friction block (29), and a plurality of limiting electric telescopic rods (210) are provided. ) is controlled by a controller, a socket base (25) is provided on the other side of the matching plate (28), the socket base (25) is connected to the inner wall of the connecting shell (21), a movable block (22) is provided on the connecting shell (21), the connecting shell (21) and the movable block (22) are movably socketed, an electromagnetic block (23) is provided on the opposite wall of the connecting shell (21) and the movable block (22), a pressure sensing ring (24) is provided on the movable block (22), a plurality of pressure sensors are provided on the pressure sensing ring (24), the pressure sensing ring (24) is in contact with the matching plate (28), and the limiting block (26) is connected to the connecting shell (21) through a connecting column (27).

2. The piezometer for reservoir and dam safety monitoring according to claim 1, characterized in that: The diaphragm (12) is made of a highly sensitive metal film.

3. The piezometer for reservoir and dam safety monitoring according to claim 1, characterized in that: The steel string (13) is made of high-strength steel.

4. The piezometer for reservoir and dam safety monitoring according to claim 1, characterized in that: The magnetic poles of the electromagnetic block (23) provided on the movable block (22) and the electromagnetic block (23) provided on the inner wall of the connecting shell (21) repel each other.

5. The piezometer for reservoir and dam safety monitoring according to claim 1, characterized in that: The position of the matching plate (28) is limited by a limiting block (26) and a pressure sensing ring (24).

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