Osmometer for safety monitoring of reservoir dam

Abstract

The invention discloses an osmometer for safety monitoring of a reservoir dam, which relates to the technical field of safety monitoring, and comprises an outer shell for providing a protection effect, a water seepage hole arranged at the end part of the outer shell, a diaphragm for detecting and judging water pressure, and an electromagnetic coil for detecting the vibration frequency of a steel wire connected with the diaphragm, and the tension adjusting mechanism is used for detecting and adjusting the tension of the steel string in real time so as to ensure the detection accuracy. According to the scheme, the tension adjusting mechanism is additionally arranged at the tail end of the steel string, the tension of the steel string can be detected in real time, when the tension of the steel string is externally influenced or changes, the tension of the steel string can be adjusted in real time, the stability of the steel string in the later use process is guaranteed, and the service life of the steel string is prolonged. Secondly, in consideration of the basic principle when the steel string is used for detection, fixation and movement of the tail end need to be considered, real-time adjustment and fixation of the steel string are synchronously guaranteed according to actual requirements, and therefore it is guaranteed 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 reservoir dam safety monitoring. Background Art

[0002] During the long-term use of reservoir dams, seepage is one of the important factors affecting dam safety. By controlling the dam seepage 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 dam seepage phenomenon.

[0003] When monitoring the seepage pressure of the dam, monitoring holes and grooves are usually opened on the dam, and then piezometers are installed therein. Then, the seepage pressure of the dam is monitored by the piezometers. The vibrating wire piezometer is widely used in water conservancy projects, geological disaster monitoring and other fields due to its advantages such as high sensitivity and long-term stability. When the vibrating wire piezometer is detecting, the water pressure acts on the highly sensitive metal film, causing it to deform, which in turn affects the tension of the steel wire. The tension of the steel wire is closely related to its vibration frequency. Therefore, by measuring the vibration frequency of the steel wire after the tension change, the seepage pressure can be calculated. However, in actual application, at the same time, the steel wire itself will also have a fatigue phenomenon due to long-term vibration. Just like a repeatedly stretched rubber band, after long-term use, it will lose its original elasticity, resulting in a change in the tightness of the steel wire grasped by the fixed end (that is, the tension changes. If the tension changes, under the same force, its vibration frequency and amplitude will both change), resulting in a change in the vibration frequency and causing zero drift. Summary of the Invention

[0004] The technical solution of the present invention provides a solution significantly different from the prior art for the technical problem that the prior art solution is too single. The embodiment of the present invention provides a piezometer for reservoir dam safety monitoring to solve the technical problem that the steel wire in the existing vibrating wire piezometer has a weakened tension due to elastic fatigue during long-term use, resulting in a change in the vibration frequency.

[0005] The embodiment of the present invention adopts the following technical solution: A piezometer for reservoir dam safety monitoring includes an outer housing providing a protective function, and also includes a water seepage hole provided at the end of the outer housing, a diaphragm for detecting and judging the water pressure, an electromagnetic coil for detecting the vibration frequency of the steel wire connected to the diaphragm, and a tension adjusting mechanism for detecting and adjusting the tension of the steel wire in real time to ensure the detection accuracy.

[0006] Further, the tension adjustment mechanism includes a connecting housing disposed within the outer housing. The steel string passes through the connecting housing and its end is connected to a mating plate located within the connecting housing. At a recessed position on the inner wall of the connecting housing, there is a friction block. On one side of the mating plate, there is a mating plate with a limiting electric telescopic rod provided thereon. The movable end of the limiting electric telescopic rod is provided with a friction head corresponding to the position of the friction block. A plurality of the limiting electric telescopic rods are controlled by a controller. On the other side of the mating plate, there is a socket base connected to the inner wall of the connecting housing. The connecting housing is provided with a movable block, and the connecting housing and the movable block are movably sleeved and connected. On the opposite facing walls of the connecting housing and the movable block, there are electromagnetic blocks. The movable block is provided with a pressure sensing ring having a number of pressure sensors thereon. The pressure sensing ring contacts the mating plate. The limiting block is connected to the connecting housing through a connecting column.

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

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

[0009] Further, the electromagnetic blocks provided on the movable block and the inner wall of the connecting housing have mutually repulsive magnetic poles.

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

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] First, during the use of this piezometer, the real-time tension of the steel string is judged by the repulsive force between the steel string and the pressure sensing ring. When the pressure sensing ring senses a change in the pressure acting on it, it will be pushed by the repulsive force of the magnetic force to adjust the tension of the steel string. During the vibration of the steel string, its tension is a key parameter to ensure the same vibration frequency. 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 wire piezometers generally has a relatively high strength, and the piezometer has a relatively small size, it is often difficult to achieve the effect of adjusting the steel string by using the gravity traction method. Secondly, when using gravity traction, it is difficult to ensure that the weight of the gravity ball will not change (such as oxidation) after long-term use. In this solution, the repulsive characteristics of the magnetic forces of two electromagnetic coils are used to ensure its stability, and during the use process, its tension is monitored and judged in real time. Compared with the gravity ball (the change in its tension is often a static change, resulting in no obvious deformation trend, and it is not convenient to adjust the non-obvious deformation using the gravity ball. This solution judges through the mutual repulsive force, and the detection is more stable and accurate);

[0013] Second, compared with the existing methods for adjusting the steel string, the non-fully fixed connection at the end of the steel string not only ensures the function of adjustment but also guarantees the transformation from movable connection to fixed connection. The fixed connection is to ensure that during actual use, the mating plate actually connected to the end of the steel string can move, and its position is restricted only by setting limiters before and after, so as to ensure the normal use of the steel string. In the existing solutions, the gravity of the steel string may be adjusted by pulling, but during the vibration of the steel string, it will exert a pulling force on both the left and right sides. Therefore, during use, the adjustable end needs to be fixed, otherwise the vibration frequency of the steel string during vibration will change, affecting the inspection accuracy.

[0014] In summary, 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 due to its own situation, 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 when using the steel string for detection, the fixation and movement of the end need to be considered. This case synchronously ensures the real-time adjustment and fixation of the steel string according to actual needs, so as to ensure 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 will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[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 structure diagram of the present invention;

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

[0019] Figure 4 It is a schematic diagram of the structure inside the outer shell of the present invention from the second perspective;

[0020] Figure 5 It is a schematic diagram of the structure of the tension adjustment mechanism of the present invention;

[0021] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at A.

[0022] Reference numerals:

[0023] 1. Outer housing; 11. Water seepage hole; 12. Diaphragm; 13. Steel string; 14. Coil; 2. Tension adjusting mechanism; 21. Connecting housing; 22. Movable block; 23. Electromagnetic block; 24. Pressure sensing ring; 25. Socket base; 26. Limiting block; 27. Connecting column; 28. Fitting plate; 29. Friction block; 210. Limiting electric telescopic rod. Detailed implementation manners

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0025] Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0026] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] The following is combined with Figures 1 to 6As shown in the figure, an osmotic pressure gauge for reservoir dam safety monitoring provided by an embodiment of the present invention includes a housing 1 that provides a protective function, and further includes a water seepage hole 11 provided at the end of the housing 1, a diaphragm 12 for detecting and judging water pressure, and 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 the detection accuracy.

[0030] During operation, in this solution, a tension adjustment mechanism 2 is added 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 the outside or changes due to its own situation, its tension can be adjusted in real time to ensure the stability of the steel string 13 during its later use. Secondly, during the use process, considering the basic principle when using the steel string 13 for detection, the fixation and movement of the end need to be considered. In this case, according to actual needs, the real-time adjustment and fixation of the steel string 13 are ensured simultaneously, so as to ensure that the steel string 13 can work properly.

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

[0032] Specifically, the diaphragm 12 is made of a high-sensitivity metal film.

[0033] During operation, since the diaphragm 12 is made of a high-sensitivity metal diaphragm 12, its service life and stability during use are ensured.

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

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

[0036] Specifically, the electromagnetic block 23 provided on the movable block 22 and the electromagnetic block 23 provided on the inner wall of the connecting housing 21 have repulsive magnetic poles.

[0037] During operation, the principle of magnetic repulsion can be used to push the movable block 22. The pressure sensor in the pressure sensing ring 24 on the movable block 22 contacts the mating plate 28. Therefore, the mutual force between the pressure sensing ring 24 and the mating plate 28 can be changed. Since the steel string 13 is connected to the mating plate 28, the function of adjusting the steel string 13 can be achieved indirectly at this time.

[0038] Working principle: When in use, first assemble the vibrating wire piezometer, and then detect the assembled vibrating wire piezometer to determine its initial vibrating wire frequency. When detecting, first let water seep through the water seepage hole 11 into contact with the diaphragm 12, select an appropriate water pressure to act on the highly sensitive metal film, causing it to deform, thereby affecting the tension of the steel wire 13. The tension of the steel wire 13 is closely related to its vibration frequency. Therefore, by measuring the vibration frequency of the steel wire 13 after the tension change, when the steel wire vibrates, since the steel wire 13 is located between two electromagnetic coils 14, when the steel wire 13 vibrates under the action of an external pressure, the steel wire 13 will cut the magnetic induction lines generated by the magnetic force coil 14, or rather, the magnetic field around the steel wire 13 will change due to the vibration of the steel wire 13. According to the electromagnetic induction principle, an induced electromotive force will be generated in the magnetic force coil 14, and the magnetic force coil 14 converts the mechanical vibration of the steel wire 13 into an electrical signal. The frequency and amplitude of this electrical signal correspond to the vibration frequency and amplitude of the steel wire 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 osmometer can be calculated according to the pre-calibrated relationship, and the osmotic pressure can be calculated. Taking this change value as the reference value, after the detection is completed, it is placed at the position where the osmotic pressure detection is required. When the water pressure is too large, it will cause a change in the electrical signal caused by the vibration of the steel string 13. At this time, it indicates that the water pressure is too large. In order to ensure the detection accuracy of the steel string 13, the steel string 13 needs to be always in a taut state. 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 mating plate 28 provided at the end. When the pulling force decreases, the contact force between the mating plate 28 and the pressure sensor in the pressure sensing ring 24 will decrease. At this time, it indicates that the tension of the steel string 13 has decreased. Therefore, it needs to be adjusted. The pressure sensor sends a signal to the processor, and the processor then transmits the converted electrical signal to the limiting electric telescopic rod 210 and the electromagnet 23 in the socket base 25 respectively. At this time, the limiting electric telescopic rod 210 works first, and its movable end contracts. The friction head connected to the movable end of the limiting electric telescopic rod 210 is disengaged from the friction block 29, so as to release the position limitation of the limiting block 26. The magnetic force in the electromagnet 23 increases, and by using the principle of negative-negative repulsion, a pushing effect is exerted on the movable block 22. Since the movable block 22 is in contact with the mating plate 28, a pushing effect can be exerted on the mating plate 28. The movement of the mating plate 28 can adjust the tension of the steel string 13 until the contact force between the pressure sensor and the mating plate 28 reaches the specified range. At this time, it also means that the tension adjustment of the steel string 13 is completed (the steel string 13 is tightened to a certain extent). At this time, the processor sends a signal to the limiting electric telescopic rod 210, and the movable end of the limiting electric telescopic rod 210 is reset to fix its position, so as to ensure the use stability. The electromagnet 23 keeps this magnetic force unchanged to ensure the mutual repulsion force between them. When the adjusted repulsion force reaches a certain level, the osmometer 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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) 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.

2. The osmometer for reservoir dam safety monitoring according to claim 1, characterized in that; The tension adjustment mechanism (2) comprises 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 a matching plate (28); the matching plate (28) is located in the connecting shell (21); a friction block (29) is arranged at a recessed position of the inner wall of the connecting shell (21); a matching plate (28) is arranged on one side of the matching plate (28); a limiting electric telescopic rod (210) is arranged on the matching plate (28); a friction head is arranged at a movable end of the limiting electric telescopic rod (210); the friction head corresponds to the position of the friction block (29); a plurality of limiting electric telescopic rods (210) are arranged. ) is controlled by a controller, a sleeve base (25) is provided on the other side of the matching plate (28), the sleeve 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 sleeved and connected, 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) via a connecting column (27).

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

4. The osmometer for reservoir dam safety monitoring according to claim 2, characterized in that: The steel string (13) is made of high-strength steel.

5. The osmometer for reservoir dam safety monitoring according to claim 2, characterized in that; The magnetic poles of the electromagnetic block (23) arranged on the movable block (22) and the electromagnetic block (23) arranged on the inner wall of the connecting shell (21) repel each other.

6. The osmometer for reservoir dam safety monitoring according to claim 2, 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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