CN105091806B - High pressure resistant vibrating string extensometer - Google Patents
High pressure resistant vibrating string extensometer Download PDFInfo
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- CN105091806B CN105091806B CN201510523465.XA CN201510523465A CN105091806B CN 105091806 B CN105091806 B CN 105091806B CN 201510523465 A CN201510523465 A CN 201510523465A CN 105091806 B CN105091806 B CN 105091806B
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- string
- string wire
- fixing end
- flange
- measurement apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a kind of high pressure resistant vibrating string extensometer, including cable connector, cable, left and right side flange, the protective housing being placed between two side flanges, the measurement apparatus being placed in inside protective housing, right-hand member fixing end, separate joint, string wire and string wire pillar, wherein, string wire tensioning is inside string wire pillar, and be fixed in left side flange and right side fixing end, measurement apparatus is fixed on string wire pillar by injection mould, measurement apparatus, string wire, string wire pillar, left side flange and the string core sensing unit of right side fixing end composition integration, the integrated string core sensing unit is located inside protective housing, with extraneous isolation completely, ensure that water pressure resistance is reliable, separate the cavity that joint is located between right side fixing end and right flange, play a part of isolation.The water pressure resistance performance of the high pressure resistant vibrating string extensometer of the present invention has a distinct increment and measured value stability has clear improvement.
Description
Technical field
The present invention relates to a kind of high pressure resistant vibrating string extensometer, belong to strain gauge means technical field.
Background technology
High pressure resistant vibrating string extensometer is mainly used in monitoring Geotechnical Engineering and the strain of other concrete structures, it is adaptable to
The long-term strain being embedded in inside hydraulic structure or other interior of buildings, measurement structure thing.Because use environment is special, its is big
Part is to install and measure for a long time under water, therefore, and instrument, which needs to have in itself, bears larger watertight ability, especially exists
In large-scale pump-up power station, it is larger to be embedded in the hydraulic pressure that the strain gauge inside dam born, in the situation of water impact, its
Hydraulic pressure is likely to be breached more than 3MPa, therefore, and higher requirement is proposed to the water pressure resistance of vibrating string extensometer.
At present, existing vibrating string extensometer it is main by two side flange 1-1, string wire 1-4, pillar 1-2, measurement apparatus 1-3 and
Cable 1-5 is constituted, and its principle schematic is as shown in Figure 1.String wire 1-4 is tensioned to inside string wire pillar 1-2, fixed to two side flanges
On 1-1, measurement apparatus 1-3 is placed on outside string wire pillar 1-2, is wrapped up using rubber or epoxy glue, for string wire exciting and
Detect the string wire natural frequency of vibration, cable 1-5 is connected with measurement apparatus 1-3, for transmit accumulation signal and transmit string wire oneself
Vibration frequency.
The deficiency that existing vibrating string extensometer is present has：1) the overall water pressure resistance of existing vibrating string extensometer is not enough：It is existing
Vibrating string type strain measuring device is located at outside string wire pillar, and is directly contacted with the external world, only with rubber or epoxy glue bag
Wrap up in and protected.Because rubber and epoxy glue are wrapped up, do not ensure that measurement apparatus is completely isolated with the external world, water pressure resistance ability has
Limit, it is impossible to used in the environment of water pressure resistance is more than 0.5MPa；2) existing vibrating string extensometer without cable it is reliably secure connection and
Water pressure resistance is protected：The cable of existing vibrating string extensometer is wrapped using rubber or epoxy glue, and its steadiness cannot be guaranteed,
Water pressure resistance ability is relatively low, meanwhile, it is joined directly together between cable internal core and measurement apparatus cored wire, press water is easy to lead to
Cross the pipeline that internal core is connected and enter measurement apparatus, cause instrument damage；3) existing vibrating string type strain measured value stability
Await further lifting：Existing vibrating string type strain measuring device and string wire are the structures separated, do not constitute stabilization
The strain sensing of integration and measurement part, must when the relative position between measurement apparatus and string wire occurs dislocation and changed
Strain sensing and exciting and measurement of the measurement apparatus to string wire of string wire can be so influenceed, measured value stability is a greater impact, its
Measured value stability awaits further lifting；4) ability of existing vibrating string extensometer adaptation external environment awaits further carrying
Rise：Contact of the existing vibrating string type strain measuring device with external environment, its exciting to string wire and measurement are inevitably
Being changed by external environment is influenceed, and the long-term measured value reliability of vibrating string extensometer is had a negative impact.
The content of the invention
It is an object of the invention to provide a kind of high pressure resistant vibrating string extensometer, vibrating string extensometer measurement stability is solved
It is relatively low, not the problem of measured value precision is not high and vibrating string extensometer water pressure resistance is not enough.
To reach above-mentioned purpose, the technological means that the present invention is used is as follows：
High pressure resistant vibrating string extensometer, including cable connector, cable, left side flange, right flange are placed in left side and right side
Protective housing between flange, the measurement apparatus being placed in inside protective housing, right-hand member fixing end, cut-off joint, string wire and string wire
Pillar；The string wire tensioning is fixed in left side flange and right side fixing end inside string wire pillar；The measurement apparatus is led to
Cross injection mould to be fixed on string wire pillar, an overall structure is connected as with string wire pillar；The protective housing, right side fixing end
And string wire pillar junction uses low stress sealing welding, make measurement apparatus, string wire, string wire pillar, left side flange and right side are solid
The strain sensing of fixed end composition integration and measurement part；The cut-off joint is located between right side fixing end and right flange
Cavity；The left side of the cut-off joint is connected with measurement apparatus cored wire, and the right side of the cut-off joint is connected with cable core；Institute
Cable is stated to be fixed on right flange using cable connector.
Foregoing cut-off joint realizes that sealing is fixed by the way of O-ring seal and coating epoxy glue.
Advantages of the present invention is as follows：
1) water pressure resistance performance has a distinct increment：The present invention is fully enclosed to guarantor by measurement apparatus and string wire, string wire pillar etc.
Enclosure interior is protected, and is hedged off from the outer world completely, reliable watertight purpose can be born by reaching, in addition, cable packages use standard
The cable connector of change is fixed and shields and sustain cable, and cable steadiness has reliable guarantee, meanwhile, in cable core and measurement apparatus cored wire
Between increase interior separations joint, it is ensured that during cable failure, press water also cannot be introduced into strain measuring device and sensing element
It is internal, it is ensured that instrument can normal work, water pressure resistance performance obtained multi-ensuring；
2) measured value stability has clear improvement：The present invention is by measurement apparatus and string wire, string wire pillar, left side flange and right side
Reliable and stable connection between the strain sensing of fixing end being assembled integrally completely and measurement part, each connector, be not in
Dislocation and relative displacement change, it is ensured that the long-time stability of instrument core sensing unit, therefore, the measured value of vibrating string extensometer
Stability and long-term reliability have guarantee；
3) ability for adapting to extraneous adverse circumstances is further enhanced：Strain sensing and measurement of the present invention with integration
Sensing unit, while being entirely encapsulated in the inside of protective housing again, has effective isolation with the external world, will not be by external environment
The influence of change, while reliable water pressure resistance cable packages structure, it is ensured that strain gauge under any humiture environment and compared with
In the environment of high hydraulic pressure, measured value stability and long adaptation are kept.
Brief description of the drawings
Fig. 1 is the structural representation of existing vibrating string extensometer；
Fig. 2 is the structural representation of the high pressure resistant vibrating string extensometer of the present invention；
Fig. 3 is the partial structural diagram of the high pressure resistant vibrating string extensometer of the present invention.
Embodiment
The present invention is described in further detail in conjunction with the drawings and specific embodiments.
As shown in Fig. 2 the high pressure resistant vibrating string extensometer of the present invention includes cable connector 2-6, cable 2-7, left side flange
2-1, right flange 2-14, the protective housing 2-2 being placed between the flange of the left and right sides, the measurement being placed in inside protective housing 2-2
Device 2-3, right-hand member fixing end 2-4, cut-off joint 2-5, string wire 2-10 and string wire pillar 2-8.
Wherein, string wire 2-10 tensioning is inside string wire pillar 2-8, and is fixed on left side flange 2-1 and right side fixing end 2-4
On, right side fixing end 2-4 is mainly used to fix string wire 2-10 another termination, and its main function is coordinated with left side flange 2-1
Common fixed and tensioning string wire 2-10, is connected as between right side fixing end 2-4 and protective housing 2-2 by low stress welding technique
One.Measurement apparatus 2-3 is completely fixed on string wire pillar 2-8 by injection mould 2-9, and one is connected as with string wire pillar 2-8
Overall structure, is not in the phenomenon for loosening and disengaging.So, high pressure resistant strain gauge of the invention, by measurement apparatus 2-3 and string wire
Pillar 2-8 fully enclosed structures being integrated by way of injection molding, in the absence of secondary fixed operation, pass through mould and ensure to measure
Device aligns installation completely with string wire pillar, and solid and reliable, is not in possibility that is eccentric and departing from；Then it will be filled with measurement
The integrated integrated string wire pillar 2-8 of 2-3 are put to load inside protective housing 2-2, string wire 2-10 both sides respectively with left side flange
2-1 and right side fixing end 2-4 are fixed together, meanwhile, protective housing 2-2 and right side fixing end 2-4 and string wire pillar 2-8 is connected
Welding is fully sealed using low stress welding technique in the place of connecing, and makes measurement apparatus 2-3, string wire 2-10, string wire pillar 2-8, left side method
The strain sensing of blue 2-1 and right side fixing end 2-4 composition integrations and measurement part, the integrated strain sensing and measurement portion
Part is located inside protective housing 2-2, with extraneous isolation completely, it is ensured that water pressure resistance is reliable.
As shown in figure 3, cut-off joint 2-5 is located at the cavity between right side fixing end 2-4 and right flange 2-14, and use
The mode of O-ring seal 2-13 and coating epoxy glue realizes that sealing is fixed.Separate on the left of joint 2-5 and measurement apparatus cored wire 2-11
Connection, right side is connected with cable core 2-12, and its effect is to play a part of isolating between string core sensing unit and cable, is prevented
After cable waterproof failure, external pressure water is entered inside string core sensing unit by cable core sheath, causes instrument damage.
Cable 2-7 is fixed on right flange 2-14 using standard cable joint 2-6, it is ensured that Exterior cable water pressure resistance can
Lean on.
Claims (2)
1. high pressure resistant vibrating string extensometer, it is characterised in that including cable connector, cable, left side flange, right flange is placed in
Protective housing between left side flange and right flange, the measurement apparatus being placed in inside protective housing, right-hand member fixing end, cut-off connect
Head, string wire and string wire pillar；The string wire tensioning is fixed in left side flange and right side fixing end inside string wire pillar；
The measurement apparatus is fixed on string wire pillar by injection mould, and an overall structure is connected as with string wire pillar；The protection
Housing, right side fixing end and string wire pillar junction use low stress sealing welding, make measurement apparatus, string wire, string wire pillar, a left side
The strain sensing and measurement part of side flange and the composition integration of right side fixing end；It is described cut-off joint be located at right side fixing end and
Cavity between right flange；It is described cut-off joint left side be connected with measurement apparatus cored wire, it is described separate joint right side and
Cable core is connected；The cable is fixed on right flange using cable connector.
2. high pressure resistant vibrating string extensometer according to claim 1, it is characterised in that the cut-off joint is using O-shaped close
The mode of seal and coating epoxy glue realizes that sealing is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510523465.XA CN105091806B (en) | 2015-08-24 | 2015-08-24 | High pressure resistant vibrating string extensometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510523465.XA CN105091806B (en) | 2015-08-24 | 2015-08-24 | High pressure resistant vibrating string extensometer |
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| Publication Number | Publication Date |
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| CN105091806A CN105091806A (en) | 2015-11-25 |
| CN105091806B true CN105091806B (en) | 2017-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510523465.XA Active CN105091806B (en) | 2015-08-24 | 2015-08-24 | High pressure resistant vibrating string extensometer |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014326B (en) * | 2017-05-15 | 2024-04-26 | 基康仪器股份有限公司 | Vibrating wire type small strain gauge |
| CN107870024B (en) * | 2017-11-06 | 2021-07-20 | 南瑞集团有限公司 | Vibrating wire type water level gauge with automatic compensation function |
| CN108106527A (en) * | 2017-11-29 | 2018-06-01 | 南瑞集团有限公司 | A kind of miniature vibrating string extensometer |
| CN110332914A (en) * | 2019-07-29 | 2019-10-15 | 基康仪器股份有限公司 | A kind of type vibration wire water pressure resistance strain gauge |
| CN110332913A (en) * | 2019-07-29 | 2019-10-15 | 基康仪器股份有限公司 | A kind of type vibration wire integral type strain gauge |
| CN113124740A (en) * | 2021-03-25 | 2021-07-16 | 南京南瑞水利水电科技有限公司 | Large-gauge-distance vibrating wire type strain gauge |
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| CN2510852Y (en) * | 2001-11-16 | 2002-09-11 | 长沙金码高科技实业有限公司 | Surface-sticked intelligent digital vibration wire strain gauge |
| CN1514217A (en) * | 2003-08-04 | 2004-07-21 | 陆致中 | High-precision steel string type strain (stress) sensor |
| CN2854544Y (en) * | 2005-07-25 | 2007-01-03 | 王风 | Force measuring structure of vibration string micro-sensor |
| CN201488851U (en) * | 2009-07-12 | 2010-05-26 | 邓铁六 | High-accuracy vibrating-wire pressure sensor |
| CN201514198U (en) * | 2009-10-10 | 2010-06-23 | 国网电力科学研究院 | Seal structure suitable for differential electric resistance strain gage and joint gage |
| CN103307963A (en) * | 2013-06-28 | 2013-09-18 | 国家电网公司 | Wide-range high pressure resistant wire type strain gauge |
| CN204118676U (en) * | 2014-09-17 | 2015-01-21 | 成都海鑫立机电科技有限公司 | Seal isolation joint |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9182306B2 (en) * | 2011-06-22 | 2015-11-10 | Etegent Technologies, Ltd. | Environmental sensor with tensioned wire exhibiting varying transmission characteristics in response to environmental conditions |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2510852Y (en) * | 2001-11-16 | 2002-09-11 | 长沙金码高科技实业有限公司 | Surface-sticked intelligent digital vibration wire strain gauge |
| CN1514217A (en) * | 2003-08-04 | 2004-07-21 | 陆致中 | High-precision steel string type strain (stress) sensor |
| CN2854544Y (en) * | 2005-07-25 | 2007-01-03 | 王风 | Force measuring structure of vibration string micro-sensor |
| CN201488851U (en) * | 2009-07-12 | 2010-05-26 | 邓铁六 | High-accuracy vibrating-wire pressure sensor |
| CN201514198U (en) * | 2009-10-10 | 2010-06-23 | 国网电力科学研究院 | Seal structure suitable for differential electric resistance strain gage and joint gage |
| CN103307963A (en) * | 2013-06-28 | 2013-09-18 | 国家电网公司 | Wide-range high pressure resistant wire type strain gauge |
| CN204118676U (en) * | 2014-09-17 | 2015-01-21 | 成都海鑫立机电科技有限公司 | Seal isolation joint |
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| 耐高水压大坝监测传感器设计关键技术;李杰等;《水电自动化与大坝监测》;20141220;第38卷(第6期);第19-20页第1、3节、图2 * |
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| CN105091806A (en) | 2015-11-25 |
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Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Co-patentee after: STATE GRID WUHAN HIGH VOLTAGE Research Institute Patentee after: NARI Group Corp. Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Co-patentee before: STATE GRID WUHAN HIGH VOLTAGE Research Institute Patentee before: NARI Group CORPORATION STATE GRID ELECTRIC POWER INSTITUTE |