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Resistance strain-type tubular pressure sensor and pressure site test method

A technology of resistance strain type and pressure sensor, which is applied in the direction of instruments, measuring force, measuring devices, etc., to achieve the effects of fewer sources of measurement errors, low cost, and simple manufacturing and calibration methods

Active Publication Date: 2019-01-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of steel wire bundle pressure field measurement in the fine research field of cable components in infrastructure construction. At the same time, the pressure sensor provided by the present invention has universal and flexible applicability to the type of solid medium to be measured. Including but not limited to soil-rock mixtures, granular materials such as storage grain accumulations, cables and steel wire bundles, continuous medium solid materials

Method used

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  • Resistance strain-type tubular pressure sensor and pressure site test method
  • Resistance strain-type tubular pressure sensor and pressure site test method
  • Resistance strain-type tubular pressure sensor and pressure site test method

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Experimental program
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Effect test

Embodiment 1

[0042] The resistance strain type circular tubular pressure sensor includes a circular steel pipe section and a foil resistance strain gauge adhered circumferentially along its inner wall. Among them, circular steel pipe sections such as figure 2 As shown, the pasting position of the strain gauge is as follows figure 1 shown. The specific manufacturing process is carried out as follows:

[0043] (1) Manufacturing of circular steel pipe joints for sensor sensitive elements. The 17-4PH martensitic stainless steel rod is subjected to solid solution treatment, and then processed by turning to form a round thin-walled steel pipe section of predetermined size, and then subjected to vacuum aging treatment at 450°C to 480°C. Experimental research shows that aging in this temperature range is 3-4 hours, and the sample structure can obtain tempered martensite, making the hardness reach 39-42HRC, and the yield strength reaches 1180MPa.

[0044] (2) Manufacturing of foil strain gauge...

Embodiment 2

[0047] Combined pressure tube sensor such as Figure 4 , which is composed of pressure sensor tube unit (7) (9), lead pipe (5) (8), and interpolated flexible connector (6) connected in series, and the strain gauge wire (10) is formed by the through internal cavity lead out. According to the number of required measuring points and the spacing of measuring points, the number of sensor tube units of the combined pressure tube and the length of the lead round tube between each tube unit are selected. If it is necessary to connect the wires and the reserved terminals of the strain gauge at the test site, the connection part can be insulated and protected by a thermoplastic tube to avoid short circuits. The external wire and the strain collector form a Wheatstone bridge circuit.

Embodiment 3

[0049] The present invention provides a pressure field test and calculation method corresponding to the sensor, the steps are as follows:

[0050] (1) The measured value ε of all the strain gauges in the pressure sensor pipe joint unit at a certain measuring point is obtained by the strain acquisition instrument i , and then by its mean According to the formula (1), the average value of the confining pressure at the measuring point is obtained

[0051] (2) Use numerical calculation methods such as finite element method to establish the confining pressure load of sensor pipe joints The plane strain model under the action takes the measured values ​​of the strain gauges at each azimuth position as the target result, and takes the average value of the confining pressure load As a known quantity, adjust Until the numerical calculation result of the circumferential strain value of the inner wall of the model agrees with the measured result, at this time That is, the dist...

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Abstract

The invention discloses a resistance strain-type tubular pressure sensor and a pressure site test method. A sensor pipe joint comprises a thin wall circular pipe joint and a plurality of foil-type resistance strain gauges, wherein the thin wall circular pipe joint is made of a high-strength martensite material, the plurality of foil-type resistance strain gauges are pasted along an annular direction of an inner wall of the pipe joint, sensitive grids of the foil-type resistance strain gauges are same in specification, the sum of the lengths of all sensitive grids are equal to the perimeter ofthe inner wall of the pipe joint, length directions of the sensitive grids are parallel to the annular direction of the pipe joint, the sensitive grids are sequentially connected in an end-to-end manner and are arranged in a width direction along an axial direction of the pipe joint in a staggered way, and a continuous 360-degree enclosed annular strain measurement region is formed in the annulardirection of the inner wall of the pipe joint. By the sensor pipe joint, the internal pressure field of cable rope steel wire bundles can be measured, and the unfavorable influence of a soil arch effect on a traditional pressure sensor device during pressure test is eliminated; by combining a pressure test calculation method, and the size of confining pressure of a measurement point and the distribution condition of the confining pressure along each direction can be accurately obtained; and multi-point measurement can be achieved after the sensor pipe joint and a lead round pipe are connectedin series by a flexible connection piece.

Description

technical field [0001] The invention belongs to the technical field of pressure testing, and relates to pressure field measurement of solid media, in particular to a resistance strain type tubular pressure sensor and a pressure field testing method, which is suitable for the internal pressure of solid media such as granular bodies, cable wire bundles, and solid materials field test. Background technique [0002] With the functional requirements of modern buildings and bridge structures such as large space, large span, and durability, more and more attention has been paid to the refined research on the mechanical properties of key stress-bearing components such as prestressed cables and main cables of suspension bridges used in these structures. , the stay cable or the main cable needs to be fastened locally with prestressed high-strength bolts through the cable clamp, so there will be a huge radial extrusion effect between the parallel steel wires inside it. The measurement ...

Claims

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Application Information

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IPC IPC(8): G01L1/22
Inventor 苗如松沈锐利王路古占平
Owner SOUTHWEST JIAOTONG UNIV
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