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Vibrating wire strain gauge with controllable truss wire

A strain gauge and vibrating wire technology, which is applied in the field of vibrating wire strain gauges, can solve problems such as strain gauge failure and loss, and achieve the effects of increased life, low cost, and simple structure

Inactive Publication Date: 2009-10-21
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, during the monitoring process of the existing vibrating wire sensors, the creep of the steel string will become serious as time goes by, which will cause the strain gauge to fail; the reason for this phenomenon is that the steel string has It is in a stretched state. According to reports, the life of domestic vibrating wire meters is generally 3 to 5 years, and its loss is quite amazing.

Method used

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  • Vibrating wire strain gauge with controllable truss wire
  • Vibrating wire strain gauge with controllable truss wire
  • Vibrating wire strain gauge with controllable truss wire

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 2 As shown, the strain gauge in the first embodiment includes a steel string 1, a coil 2, a fixed mounting block 3, a movable mounting block 4 and a protective tube 5, and the coil 2 is a double coil structure, one of which is an exciting coil and the other is a As for the vibration pickup coil, the coil 2 is sealed inside the coil housing 6 , and the thermistor 10 is correspondingly arranged close to the coil 2 .

[0031] Such as image 3 As shown, the steel string 1 is arranged inside the protection tube 4, and one end of the steel string 1 is fixedly connected with the fixed installation block 3 and sealed by an O-ring, and a baffle 45 is longitudinally arranged on the movable installation block 4, and the slideway 42 is The circular hole arranged on the baffle plate 45 is transversely penetrated. The movable part 41 is a cylinder whose length is greater than the length of the slideway. The other end is connected with the movable part 41 inside the ...

Embodiment 2

[0036] Such as Figure 4 As shown, the difference between the present embodiment and the first embodiment is that the present embodiment adopts different recovery methods of the movable parts, instead of adopting the return spring, a return magnet whose magnetism is much weaker than that of the electromagnet 44 is arranged on the movable mounting block. 48. The return magnet 48 is a permanent magnet, and in a normal state, an external pull-back force is applied to the movable part 41 in a direction opposite to the tension direction of the steel string 1, so that the steel string 1 is in a relaxed state.

[0037] The magnetic conductor 43 is a permanent magnet, and the electromagnet 44 and the return magnet 48 are all arranged on the side of the movable part 41 that is not connected to the steel string 1. The polarity of the magnetic conductor 43 is different from that of the electromagnet 44 and is different from that of the return magnet. Sex is the same.

[0038] In the pre...

Embodiment 3

[0040] Such as Figure 5 and Figure 6 As shown, in this embodiment, the limit sliding device 42 includes an electromagnet bracket 7, a sliding pole 8 and a sliding through hole 9, the electromagnet bracket 7 is arranged on the movable mounting block 4, and the electromagnet 44 is arranged on the electromagnet bracket 7 On the electromagnet bracket 7, four sliding rods 8 are evenly arranged along the circumference, and the return spring 47 is sleeved on the sliding rods 8. The sliding through hole 9 is arranged on the movable part 41 and corresponds to the sliding rods 8. The electromagnetic The iron bracket 7 is inserted into the inside of the sliding through hole 9 through the sliding pole 8 to realize the connection with the movable part 4. Under the action of external force, the movable part 41 can slide back and forth on the sliding pole 8; the movable part 41 is provided with a magnetic conductor 43.

[0041] When the device of this embodiment is in a normal state, due...

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Abstract

The invention discloses a vibrating wire strain gauge with controllable truss wire, comprising a string wire, a coil, a fixed mounting block and a protective pipe; the strain gauge further comprises a movable mounting block; the movable mounting block is provided with a movable element; one end of the string wire is fixedly connected with the fixed mounting block, and the other end thereof is connected with the movable mounting block; the movable mounting block is provided with a limiting slide device matched with the movable element; the movable element is provided with a magnetic conductor; and the movable mounting block is provided with an electromagnet capable of generating magnetic attraction to the magnetic conductor to tension the string wire under the condition that the electromagnet is electrified. The invention controls the tension and de-tension of the vibrating strain gauge by the magnetic force of the electromagnet according to the practical situation that most vibrating wire strain gauges only have a plurality of times of daily measurements, thereby tensioning the string wire while sampling and de-tensioning the string wire when not in sampling to avoid creep phenomenon; therefore, the service time of the vibrating wire strain gauge is prolonged; simultaneously, the vibrating wire strain gauge has reasonable structure, easy implementation and low cost, thereby being suitable for popularization and application in large scale.

Description

technical field [0001] The invention relates to a vibrating wire strain gauge with controllable string tension. Background technique [0002] The vibrating wire sensor is a non-electrical measurement sensor that is widely valued and widely used at home and abroad. The vibrating wire sensor has the advantages of simple structure, sturdy and durable, strong anti-interference ability, reliable measurement, high precision and resolution, and good stability; its output is a frequency signal, which is convenient for long-distance transmission, and can be directly interfaced with a computer. Used in geotechnical engineering testing. [0003] The general working principle of the vibrating wire sensor is: the steel string is placed in the magnetic field, and after the steel string is excited by a certain method, the steel string will resonate, and the resonant string will cut the magnetic force line in the magnetic field. Therefore, it can be The electric potential u is induced in ...

Claims

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Application Information

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IPC IPC(8): G01B5/30
Inventor 张奔牛李伟湛刘玉龙
Owner CHONGQING JIAOTONG UNIVERSITY
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