Bridge stress-strain signal sensor

Abstract

The utility model discloses a bridge stress-strain signal sensor, and belongs to the field of bridge stress-strain sensors, and the bridge stress-strain signal sensor comprises a vibrating wire type sensor body and fixing mechanisms disposed at two ends of the vibrating wire type sensor body. The fixing mechanism comprises positioning assemblies fixedly installed at the two ends of the vibration wire type sensor body and pre-tightening adjusting assemblies arranged on the side faces of the positioning assemblies and used for adjusting the pre-tightening force of the vibration wire type sensor body. The pre-tightening adjusting assembly comprises a connecting plate used for being connected with the surface of the bridge and sliding rods symmetrically fixed to the connecting plate and slidably connected with the positioning assembly. According to the bridge stress-strain signal sensor, through the welding frame and the friction particles on the connecting plate and filling of the epoxy resin, the fitting degree of the sensor and the surface of a bridge is effectively improved, and the problem of mounting looseness caused by deviation of the flatness of the surface of the bridge is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of bridge stress and strain sensors, and particularly relates to a bridge stress and strain signal sensor. BACKGROUND

[0002] The bridge stress and strain sensor, also known as a bridge stress sensor or a bridge strain sensor, is a device specially used in bridge engineering for measuring the force and stress change of a bridge component; the sensor mainly works on the basis of the strain resistance principle, that is, when the bridge component is subjected to external force, deformation occurs, and then stress change in the component is caused. The sensor converts the stress change into resistance change, and then converts the resistance change into a voltage signal or other measurable physical quantity output through a circuit.

[0003] Generally, when the stress and strain of a bridge surface are monitored, a vibrating string sensor is used, a steel string of which is fixed at both ends of the sensor and is pre-tensioned, the deformation of the bridge changes the tension of the string, vibration is excited by an electromagnetic coil and the frequency is detected, and finally a signal is sent. However, the steel string needs to be pre-tensioned with precise initial tension to ensure that its natural frequency is in the linear response interval, and insufficient pre-tensioning force will lead to decreased sensitivity, and excessive pre-tensioning force will cause material fatigue. The existing installation and fixing structure only provides mounting holes to be fixed on the mounting seat on the surface of the bridge by expansion bolts. Due to the deviation of the flatness of the bridge surface, the fitting degree of the mounting seat is insufficient, and the mounting seat is prone to looseness during long-term use, resulting in insufficient pre-tensioning force of the steel string and deviation of the monitoring result.

[0004] Therefore, the application provides a bridge stress and strain signal sensor to solve the above problems. CONTENT OF THE UTILITY MODEL

[0005] The application provides a bridge stress and strain signal sensor, which aims to solve the problem of insufficient fitting degree of the existing bridge stress and strain signal sensor in the background art when it is installed and fixed on the surface of the bridge, which causes deviation of the monitoring result.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: a bridge stress and strain signal sensor, comprising a vibrating string sensor body and a fixing mechanism arranged at both ends of the vibrating string sensor body, the fixing mechanism comprising a positioning assembly fixedly installed at both ends of the vibrating string sensor body and a pre-tensioning adjusting assembly arranged on the side surface of the positioning assembly and used for adjusting the pre-tensioning force of the vibrating string sensor body.

[0007] The pre-tensioning adjusting assembly comprises a connecting plate used for connecting with the surface of the bridge, a sliding rod symmetrically fixed on the connecting plate and in sliding connection with the positioning assembly, and an adjusting nut screwed on the sliding rod and in contact with one end of the positioning assembly.

[0008] The welding frame on the connecting plate has a plurality of friction particles fixedly connected to the connecting plate and arranged in a rectangular array on the inner side of the welding frame, and the friction particles have gaps filled with epoxy resin between them. In this way, the adhesion of the sensor to the surface of the bridge is effectively improved by the welding frame and friction particles on the connecting plate and the filling of the epoxy resin, the installation looseness problem caused by the deviation of the flatness of the bridge surface is reduced, and the pre-tightening adjustment assembly allows the user to accurately adjust the pre-tightening force of the sensor body by adjusting the position of the adjusting nut on the sliding rod, which ensures that the steel string is always in the best working state and improves the accuracy of the monitoring results.

[0009] Preferably, the four corners of the connecting plate have mounting holes.

[0010] Preferably, the positioning assembly includes a clamping frame and a bracket clamped on both sides of the end of the vibrating string sensor body and a hexagonal lock bolt screwed on the bracket for locking the clamping frame.

[0011] Preferably, the vibrating string sensor body has a clamping ring on each side of the end, and the side of the clamping frame and the bracket close to each other is provided with a semicircular clamping groove for accommodating the semicircle of the clamping ring.

[0012] Preferably, the side of the bracket close to the connecting plate is provided with a sliding groove, and the side of the connecting plate close to the bracket has a sliding rail in sliding connection with the sliding groove.

[0013] Preferably, the sliding rod is screwed with an anti-loosening nut in contact with the end of the adjusting nut away from the bracket.

[0014] The bridge stress and strain signal sensor effectively improves the adhesion of the sensor to the surface of the bridge by the welding frame and friction particles on the connecting plate and the filling of the epoxy resin, and reduces the installation looseness problem caused by the deviation of the flatness of the bridge surface.

[0015] The bridge stress and strain signal sensor, the design of the pre-tightening adjustment assembly allows the user to accurately adjust the pre-tightening force of the sensor body by adjusting the position of the adjusting nut on the sliding rod, which ensures that the steel string is always in the best working state and improves the accuracy of the monitoring results. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural diagram of a bridge stress and strain signal sensor Figure 1

[0017] Figure 2 It is a structural diagram of a bridge stress and strain signal sensor Figure 2

[0018] ​​Figure 3 This is a schematic diagram of the exploded structure of a bridge stress-strain signal sensor.

[0019] In the picture:

[0020] 1. Vibration string sensor body; 11. Snap ring;

[0021] 2. Fixed mechanism;

[0022] 21. Positioning component; 211. Frame; 212. Support; 2121. Slide groove; 213. Socket hex bolt; 214. Semicircular slot;

[0023] 22. Preload adjustment assembly; 221. Connecting plate; 2211. Mounting hole; 2212. Welding frame; 2213. Friction particles; 222. Slide rod; 223. Slide rail; 224. Adjusting nut; 225. Anti-loosening nut. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] This embodiment provides a bridge stress-strain signal sensor, such as... Figures 1-3 As shown, the bridge stress-strain signal sensor includes a vibrating string sensor body 1 and a fixing mechanism 2 disposed at both ends of the vibrating string sensor body 1. The fixing mechanism 2 includes a positioning component 21 fixedly installed at both ends of the vibrating string sensor body 1 and a pre-tightening adjustment component 22 disposed on the side of the positioning component 21 for adjusting the pre-tightening force of the vibrating string sensor body 1.

[0026] The preload adjustment assembly 22 includes a connecting plate 221 for connecting to the bridge surface, a slide rod 222 symmetrically fixed on the connecting plate 221 and slidably connected to the positioning assembly 21, and an adjusting nut 224 screwed onto the slide rod 222 and in contact with one end of the positioning assembly 21.

[0027] Among them, the edge of the connecting plate 221 away from the positioning component 21 has a welding frame 2212, and the inner side of the welding frame 2212 has a plurality of friction particles 2213 that are fixedly connected to the connecting plate 221 and distributed in a rectangular array, and there are gaps between the friction particles 2213 to accommodate epoxy resin filling.

[0028] In use, first, the position of the bridge that needs to be monitored is determined, and the surface of the position is cleaned to ensure that there is no oil stain, dust and other impurities; then the connecting plate 221 is installed on the surface of the bridge by expansion bolts or other suitable fixing methods; since the connecting plate 221 has a welding frame 2212 and friction particles 2213, an appropriate amount of epoxy resin can be applied in the welding frame 2212 before installation, and then it is fixed on the surface of the bridge, and after the epoxy resin is cured, the adhesion and firmness of the reinforced connecting plate 221 to the surface of the bridge are improved; when the pre-tightening force needs to be adjusted after installation, the vibration string type sensor body 1 is installed on the sliding rod 222 through the positioning assembly 21, at this time, the position of the adjusting nut 224 on the sliding rod 222 can be adjusted, and by rotating the adjusting nut 224, it can be in close contact with one end of the positioning assembly 21, thereby providing the necessary pre-tightening force to adjust the tension at both ends of the sensor body 1, thereby adjusting the pre-tightening force of the steel string; during monitoring, after confirming that the sensor body 1 has been correctly installed and pre-tightened, the stress and strain of the bridge can be monitored, and the vibration string type sensor body 1 converts the stress change of the bridge into an electrical signal and transmits and processes it through a circuit.

[0029] Among them, the four corners of the connecting plate 221 have mounting holes 2211; it is convenient to firmly install the connecting plate 221 on the surface of the bridge by expansion bolts or other fixing members.

[0030] Specifically, the positioning assembly 21 includes a clamping frame 211 and a support 212 clamped on both sides of the end of the vibration string type sensor body 1, and an internal hexagonal lock bolt 213 screwed on the support 212 for locking the clamping frame 211, wherein the vibration string type sensor body 1 has a clamping ring 11 on both sides of the end, and the clamping frame 211 and the support 212 are both provided with a semicircular clamping groove 214 on the side close to each other for accommodating the semicircle of the clamping ring 11; the positioning assembly 21 clamps the end of the vibration string type sensor body 1 through the clamping frame 211 and the support 212, and locks it by using the internal hexagonal lock bolt 213, to ensure the stability and accuracy of the sensor body 1 during installation.

[0031] Further, the support 212 is provided with a sliding groove 2121 on the side close to the connecting plate 221, and the connecting plate 221 is provided with a sliding rail 223 on the side close to the support 212, which is in sliding connection with the sliding groove 2121; the cooperation of the sliding groove 2121 and the sliding rail 223 enables the positioning assembly 21 to slide on the connecting plate 221, thereby adjusting the position of the sensor body 1, and improving the connection strength in cooperation with the sliding rod 222, and further improving the stability of the connection.

[0032] Further, the sliding rod 222 is screwed with an anti-loosening nut 225 in contact with the end of the adjusting nut 224 away from the support 212; the anti-loosening nut 225 reduces the influence of bridge vibration on the adjusting nut 224, ensures the stability of the pre-tightening force, improves the service life of the device, and prolongs the maintenance period.

[0033] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacements or changes according to the technical solution and concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A bridge stress-strain signal sensor comprising a vibrating string sensor body (1) and a fixing mechanism (2) arranged at both ends of the vibrating string sensor body (1), characterized in that: The fixing mechanism (2) comprises a positioning assembly (21) fixedly installed at both ends of the vibrating string type sensor body (1) and a pre-tightening adjusting assembly (22) arranged at the side of the positioning assembly (21) and used for adjusting the pre-tightening force of the vibrating string type sensor body (1); The pre-tightening adjusting assembly (22) comprises a connecting plate (221) used for being connected with the surface of the bridge, a slide rod (222) symmetrically fixed on the connecting plate (221) and in sliding connection with the positioning assembly (21), and an adjusting nut (224) screwed on the slide rod (222) and in contact with one end of the positioning assembly (21); Wherein, the side edge of the connecting plate (221) away from the positioning assembly (21) is provided with a welded frame (2212), and the inner side of the welded frame (2212) is provided with a plurality of friction particles (2213) fixedly connected with the connecting plate (221) and arranged in a rectangular array, and the friction particles (2213) are provided with gaps filled with epoxy resin.

2. The bridge stress strain signal sensor of claim 1, wherein: The four corners of the connecting plate (221) are provided with mounting holes (2211).

3. The bridge stress strain signal sensor of claim 2, wherein: The positioning assembly (21) comprises a clamping frame (211) and a support (212) clamped on both sides of the end of the vibrating string type sensor body (1) and a hexagonal socket cap screw (213) screwed on the support (212) and used for locking the clamping frame (211).

4. The bridge stress strain signal sensor of claim 3, wherein: Both sides of the vibrating string type sensor body (1) are provided with clamping rings (11), and the side of the clamping frame (211) and the support (212) close to each other is provided with a semicircular clamping groove (214) used for accommodating the semicircle of the clamping ring (11).

5. The bridge stress strain signal sensor of claim 4, wherein: The side of the support (212) close to the connecting plate (221) is provided with a sliding groove (2121), and the side of the connecting plate (221) close to the support (212) is provided with a slide rail (223) in sliding connection with the sliding groove (2121).

6. The bridge stress strain signal sensor of claim 5, wherein: The slide rod (222) is screwed with an anti-loosening nut (225) in contact with the end of the adjusting nut (224) away from the support (212).

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