CN109357606B - Clamping mechanism for vibrating wire type strain sensor calibration device - Google Patents
Clamping mechanism for vibrating wire type strain sensor calibration device Download PDFInfo
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- CN109357606B CN109357606B CN201811453115.0A CN201811453115A CN109357606B CN 109357606 B CN109357606 B CN 109357606B CN 201811453115 A CN201811453115 A CN 201811453115A CN 109357606 B CN109357606 B CN 109357606B
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- type strain
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- 230000007246 mechanism Effects 0.000 title claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 48
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
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- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses a clamping mechanism for a vibrating wire type strain sensor calibration device, which comprises a left clamp and a right clamp, wherein the left clamp comprises a left sliding block, a left smooth through hole for penetrating a guide sliding rod and a left threaded through hole for being in threaded connection with a power screw rod are formed in the left sliding block, and a left clamping head is fixed at the top of the left sliding block; the right clamp comprises a right sliding block, a right smooth perforation for penetrating through the guide sliding rod and a right smooth perforation for penetrating through the power screw rod are arranged on the right sliding block, and a right clamping head is fixed at the top of the right sliding block; the left displacement sensor and the right displacement sensor are used for detecting sliding amounts of the left end and the right end of the vibrating wire type strain sensor simultaneously, so that measurement accuracy is improved, and the stressed change condition can be detected in real time.
Description
Technical Field
The invention belongs to the technical field of metering calibration equipment, and particularly relates to a clamping mechanism for a vibrating wire type strain sensor calibration device.
Background
The vibrating wire type strain sensor is an advanced sensor in the current stress strain measurement, the sensor outputs frequency instead of voltage, and the sensor can not cause obvious attenuation of signals due to the change of wire resistance and temperature fluctuation, has the advantages of simple structure, high precision, strong anti-interference capability, long signal transmission distance, good long-term stability and the like, can be applied to severe environments such as low temperature, high temperature and high radiation, and is widely applied to safety pre-warning and safety detection in the fields such as dams, bridges, large buildings, subways, ship building, mines, coal mines, foundation pits, water conservancy and hydropower, petrochemical industry, nuclear power stations and the like.
Aiming at the vibrating wire type strain sensor, the national formulates general technical conditions of the vibrating wire type strain sensor of the geotechnical test instrument geotechnical engineering instrument of GB/T13606-2007 and the calibration standard of the JJF 1305-2011 linear displacement sensor, and provides the technical requirements and the calibration method of the basic error and the linearity of the vibrating wire type strain sensor, but does not specify which standard instrument is adopted to ensure the accurate and reliable magnitude, and does not specify a unified calibration method and device. In recent years, the domestic part of the mechanism designs a calibration device according to the specification, for example, a chinese patent CN101738157a discloses a vibrating wire type strain sensor calibration device, which is mainly of a purely mechanical structure, uses a dial indicator to perform measurement, and mainly has the problems of high calibration labor intensity, low calibration efficiency and difficulty in obtaining repeatability errors. Chinese patent CN107621222a discloses a vibrating wire strain gauge calibration device, which measures the tiny length variation during the calibration process, but has a significant influence on the calibration result due to the sliding problem of the clamping part of the sensor; when calibrating a wide-range vibrating wire sensor, the device can deform, and the rigidity of the device cannot meet the calibration requirement.
In the calibration process, the clamping stability requirement on the vibrating wire type strain sensor is high, however, no special vibrating wire type strain sensor clamping device is used for the vibrating wire type strain sensor calibration device at present.
Disclosure of Invention
The invention aims to provide a clamping mechanism for a vibrating wire type strain sensor calibration device; the technical scheme adopted for achieving the purpose is as follows:
The clamping mechanism for the vibrating wire type strain sensor calibration device comprises a left clamp and a right clamp, wherein the left clamp comprises a left sliding block, a left smooth through hole for penetrating a guide sliding rod and a left threaded through hole for being in threaded connection with a power screw rod are formed in the left sliding block, and a left clamping head is fixed at the top of the left sliding block; the right clamp comprises a right sliding block, a right smooth perforation for penetrating through the guide sliding rod and a right smooth perforation for penetrating through the power screw rod are arranged on the right sliding block, and a right clamping head is fixed at the top of the right sliding block.
Preferably, a left positioning groove is formed in the bottom of the left clamping head, a left mounting perforation is formed beside the left positioning groove, a left positioning bulge corresponding to the left positioning groove is formed on the left sliding block, and a left fixing threaded hole corresponding to the left mounting perforation is formed beside the left positioning bulge; the bottom of the right clamping head is provided with a right positioning groove, a right mounting perforation is arranged beside the right positioning groove, a right positioning bulge corresponding to the right positioning groove is arranged on the right sliding block, and a right fixing threaded hole corresponding to the right mounting perforation is arranged beside the right positioning bulge.
Preferably, a left displacement sensor is fixed on the left sliding block, and the left displacement sensor is positioned at the left side of the left clamping head; a right displacement sensor is fixed on the right sliding block and is positioned on the right side of the right clamping head; the left displacement sensor and the right displacement sensor are matched to detect the left and right sliding quantity of the vibrating wire type strain sensor.
Preferably, a fixed table is fixed on the left sliding block, a sliding table is connected on the fixed table in a sliding way along the left-right direction, a fastening bolt for fixing the sliding table is arranged on the sliding table, and a left clamping seat for fixing a left displacement sensor is fixed on the top of the sliding table; a right clamping seat for fixing the right displacement sensor is fixed on the right sliding block.
Preferably, a main scale mark is arranged on the fixed table, a vernier scale mark is arranged on the sliding table, and the fixed table and the sliding table form a vernier caliper structure.
Preferably, the top of the sliding table is provided with mounting holes distributed in a matrix, and the left clamping seat is fixed at different positions on the top of the sliding table through different mounting holes.
The invention has the beneficial effects that: (1) The sliding quantity of the left end and the right end of the vibrating wire type strain sensor is detected through the left displacement sensor and the right displacement sensor, so that the measurement accuracy is improved, and the change condition of the stressed value can be detected in real time; (2) The left displacement sensor realizes the functions of coarse adjustment and fine adjustment through the cooperation of the fixed table and the sliding table; (3) The measuring displacement amounts of the left displacement sensor, the right displacement sensor and the grating ruler displacement sensor are in the same direction, so that Abbe errors caused by mechanism deformation are reduced; (4) The invention realizes the full-automatic calibration of the vibrating wire strain sensor, the vibrating wire displacement meter and the vibrating wire seam meter, and accords with the national standard of computing method of main static performance index of GB/T18459-2001 sensor, general technical condition of the vibrating wire sensor of geotechnical test instrument of GB/T13606-2007 and calibration specification of the JJF 1305-2011 linear displacement sensor.
Drawings
FIG. 1 is a schematic view of an assembled perspective structure of the present invention;
FIG. 2 is an enlarged perspective view of the left clamp of FIG. 1;
fig. 3 is an enlarged perspective view of the right clamp of fig. 1.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, firstly, the invention is assembled on a special vibrating wire type strain sensor calibration device, wherein the vibrating wire type strain sensor calibration device comprises a base 8, a left fixing seat 9 is fixed at the left end of the base 8, a right fixing seat 6 is fixed at the right end of the base 8, a guide sliding rod 4 is fixed between the left fixing seat 9 and the right fixing seat 6, a power screw 3 is rotatably connected, a clamping mechanism of the invention is assembled between the left fixing seat 9 and the right fixing seat 6, specifically, the clamping mechanism of the invention comprises a left clamp 1 and a right clamp 5, the left clamp 1 comprises a left sliding block 104, the left sliding block 104 is sleeved on the left half part of the guide sliding rod 4 and the power screw 3, the left sliding block 104 is in sliding connection with the guide sliding rod 4 and in threaded transmission connection with the power screw 3, and a left clamping head 103 is fixed on the left sliding block 104; the right clamp 5 comprises a right slider 505, the right slider 505 is sleeved on the right half part of the guide slide rod 4 and the power screw 3, the right slider 505 is in sliding connection with the guide slide rod 4 and the power screw 3, two ends of the S-shaped tension pressure sensor 504 are respectively fixed on the right slider 505 and the right fixing seat 6, a right clamping head 501 is fixed on the right slider 502, and the left clamping head 103 and the right clamping head 501 are matched to fix the vibrating wire type strain sensor.
According to vibrating wire strain sensors with different specifications and models, a plurality of sets of clamping heads can be correspondingly manufactured, each set of clamping head comprises a left clamping head 103 and a right clamping head 501, anti-skidding patterns are arranged in clamping holes of the left clamping head 103 and the right clamping head 501, a left positioning groove is formed in the bottom of the left clamping head 103 for facilitating quick replacement and accurate positioning, left mounting through holes are formed beside the left positioning groove, left positioning protrusions corresponding to the left positioning grooves are formed on the left sliding block 104, and left fixing threaded holes corresponding to the left mounting through holes are formed beside the left positioning protrusions; a right positioning groove is arranged at the bottom of the right clamping head 501, a right mounting perforation is arranged beside the right positioning groove, a right positioning bulge corresponding to the right positioning groove is arranged on the right sliding block 505, and a right fixing threaded hole corresponding to the right mounting perforation is arranged beside the right positioning bulge.
As shown in fig. 2 and 3, a fixed table 108 is fixed to the left slider 104, a slide table 109 is slidably connected to the fixed table 108 in the left-right direction, a fastening bolt (not shown in the back view) for fixing the slide table 109 is provided to the slide table 109, a left clamp seat 102 for fixing the left displacement sensor 101 is fixed to the top of the slide table 109, and the left displacement sensor 101 is positioned on the left side of the left clamp head 103; a right clamping seat 502 for fixing a right displacement sensor 503 is fixed on the right slider 505, the right displacement sensor 503 is located on the right side of the right clamping head 501, and the left displacement sensor 101 and the right displacement sensor 503 are matched to detect the left-right sliding amount of the vibrating wire strain sensor.
Meanwhile, a main scale mark 106 is arranged on the fixed table 108, a vernier scale mark 105 is arranged on the sliding table 109, and the fixed table 108 and the sliding table 109 form a vernier caliper structure. The top of the sliding table 109 is provided with mounting holes 1010 distributed in a matrix, and the left clamping seat 102 is fixed at different positions at the top of the sliding table 109 through different mounting holes 1010, so that the left displacement sensor 101 can perform coarse adjustment and fine adjustment with high accuracy at a large distance for vibrating wire type strain sensors with different specifications.
On the other hand, the left clamping seat 102 is provided with a plurality of left clamping holes for fixing the left displacement sensor 101, and the right clamping seat 502 is provided with a plurality of right clamping holes for fixing the right displacement sensor 503.
In order to ensure stability in the moving process, the left slider 104 and the right left slider 505 are suspended on the guide slide rod 4 and the power screw rod 3, two of the guide slide rods 4 are respectively positioned at two sides of the power screw rod 3, and the third guide slide rod 4 is positioned below the guide slide rod 4.
When the vibrating wire type strain sensor is used, firstly, a proper left clamping head 103 and right clamping head 501 are selected according to the specification and model of the vibrating wire type strain sensor to be calibrated, and are respectively fixed on a left sliding block 104 and a right sliding block 505, and then two ends of the vibrating wire type strain sensor are respectively fixed on the left clamping head 103 and the right clamping head 501; adjusting the right displacement sensor 503 to detect the right end face displacement of the vibrating wire type strain sensor, and zeroing the reading; the left displacement sensor 101 is adjusted by adjusting the mounting position of the left clamping seat 102 on the sliding table 109 and the micro-movement of the sliding table 109 so as to detect the left end face displacement of the vibrating wire strain sensor, and the reading is zeroed; then, the servo motor 12 is started to drive the power screw 3 to slowly rotate, so that the left slider 104 is driven to move rightwards, the grating ruler displacement sensor detects the displacement in the moving process, the S-shaped tension pressure sensor 504 detects the stress, and according to the displacement data, the required calibration parameters can be evaluated by combining the related measurement data of the vibrating wire type strain sensor.
In order to avoid damage to the instrument caused by rightward movement of the left slider 104 in the measuring process, the base 8 is provided with limit switches 2, one of the limit switches 2, for example, the left limit switch 2, can be fixed on the base 8, and the other limit switch 2 can be detachably fixed on the base 8, so that the position of the other limit switch 2 can be adaptively adjusted according to the measuring range of the vibrating wire type strain sensor to be calibrated. Further, the other limit switch 2 may be fixed to the base 8 by means of a magnetic attraction force by means of a magnetic seat.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. The clamping mechanism for the vibrating wire type strain sensor calibration device is characterized by comprising a left clamp and a right clamp, wherein the left clamp comprises a left sliding block, a left smooth through hole for penetrating a guide sliding rod and a left threaded through hole for being in threaded connection with a power screw rod are formed in the left sliding block, and a left clamping head is fixed at the top of the left sliding block; the right clamp comprises a right sliding block, a right smooth perforation for penetrating through the guide sliding rod and a right smooth perforation for penetrating through the power screw rod are arranged on the right sliding block, and a right clamping head is fixed at the top of the right sliding block; two ends of the S-shaped tension pressure sensor are respectively fixed on the right sliding block and the right fixing seat;
The vibrating wire type strain sensor calibration device comprises a base, a left fixing seat is fixed at the left end of the base, a right fixing seat is fixed at the right end of the base, a guide sliding rod is fixed between the left fixing seat and the right fixing seat, a power screw is rotationally connected with the left fixing seat and the right fixing seat, and a clamping mechanism is assembled between the left fixing seat and the right fixing seat;
The bottom of the left clamping head is provided with a left positioning groove, a left mounting perforation is arranged beside the left positioning groove, a left positioning bulge corresponding to the left positioning groove is arranged on the left sliding block, and a left fixing threaded hole corresponding to the left mounting perforation is arranged beside the left positioning bulge; a right locating groove is formed in the bottom of the right clamping head, a right mounting perforation is formed beside the right locating groove, a right locating bulge corresponding to the right locating groove is formed on the right sliding block, and a right fixing threaded hole corresponding to the right mounting perforation is formed beside the right locating bulge;
A left displacement sensor is fixed on the left sliding block and is positioned at the left side of the left clamping head; a right displacement sensor is fixed on the right sliding block and is positioned on the right side of the right clamping head; the left displacement sensor and the right displacement sensor are matched to detect left and right sliding amounts of the vibrating wire type strain sensor;
A fixed table is fixed on the left sliding block, a sliding table is connected on the fixed table in a sliding way along the left-right direction, a fastening bolt for fixing the sliding table is arranged on the sliding table, and a left clamping seat for fixing a left displacement sensor is fixed on the top of the sliding table; a right clamping seat for fixing a right displacement sensor is fixed on the right sliding block;
the two ends of the vibrating wire type strain sensor are respectively fixed on the left clamping head and the right clamping head, the left displacement sensor and the right displacement sensor are adjusted to detect the left end face displacement and the right end face displacement of the vibrating wire type strain sensor, the reading is zeroed, then the servo motor is started to drive the left sliding block to move rightwards with the rotation of the power screw rod, the displacement is detected by the grating ruler displacement sensor in the moving process, the stress is detected by the S-shaped tension pressure sensor, and according to the displacement data, the required calibration parameters can be evaluated by combining the relevant measurement data of the vibrating wire type strain sensor.
2. The clamping mechanism for a vibrating wire type strain sensor calibration device according to claim 1, wherein main scale graduation marks are arranged on a fixed table, vernier scale graduation marks are arranged on a sliding table, and the fixed table and the sliding table form a vernier caliper structure.
3. The clamping mechanism for the vibrating wire strain sensor calibration device according to claim 1 or 2, wherein the top of the sliding table is provided with mounting holes distributed in a matrix, and the left clamping seat is fixed at different positions on the top of the sliding table through different mounting holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811453115.0A CN109357606B (en) | 2018-11-30 | 2018-11-30 | Clamping mechanism for vibrating wire type strain sensor calibration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811453115.0A CN109357606B (en) | 2018-11-30 | 2018-11-30 | Clamping mechanism for vibrating wire type strain sensor calibration device |
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| CN109357606A CN109357606A (en) | 2019-02-19 |
| CN109357606B true CN109357606B (en) | 2024-07-12 |
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| CN201811453115.0A Active CN109357606B (en) | 2018-11-30 | 2018-11-30 | Clamping mechanism for vibrating wire type strain sensor calibration device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110631522B (en) * | 2019-11-04 | 2021-04-13 | 中交一公局土木工程建筑研究院有限公司 | String type strain gauge for concrete injection |
| CN112857165B (en) * | 2021-01-15 | 2021-12-10 | 河南理工大学 | Vernier caliper capable of effectively reducing Abbe error and measuring method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208936950U (en) * | 2018-11-30 | 2019-06-04 | 河南省计量科学研究院 | A kind of calibrating device for vibrating string type strain transducer clamping device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3903747A (en) * | 1974-05-16 | 1975-09-09 | Us Navy | Vibrating wire attitude reference sensing system |
| US5038622A (en) * | 1989-12-22 | 1991-08-13 | Tijmann Willem B | Strain gage assembly for measuring excessive tensile strain of a flexible elongated member, such as a steel structural cable, or an electrical transmission cable, or a glass fiber optic communication cable, which may slightly twist under tensile strain |
| US5355715A (en) * | 1992-06-29 | 1994-10-18 | Pile Dynamics, Inc. | Strain transducer calibration device |
| CA2121294C (en) * | 1994-04-14 | 1997-01-14 | Gerhard H. Herget | Extended range vibrating wire strain monitor |
| DE19841986A1 (en) * | 1998-09-03 | 2000-03-23 | Hochtemperatur Materialien Und | Vibrating string sensor for determining forces; has single electrically conducting string clamped between discs of hard conductive material on slotted studs |
| CN200975934Y (en) * | 2006-11-10 | 2007-11-14 | 上海诸光机械有限公司 | Sensor displacement checking device |
| CN101738157A (en) * | 2009-12-18 | 2010-06-16 | 华南理工大学 | Calibrating device for vibrating string type strain transducer |
| CN201983753U (en) * | 2010-12-30 | 2011-09-21 | 南京林业大学 | Surface strain gauge sensor with outrange protection function |
| CN203772202U (en) * | 2014-03-19 | 2014-08-13 | 沈阳建筑大学 | Adjusting device of vibrating wire strainometer for measuring compression strain |
| CN104111134B (en) * | 2014-06-27 | 2016-08-24 | 深圳职业技术学院 | Pulling capacity detector and method of testing thereof |
| CN205843589U (en) * | 2015-11-25 | 2016-12-28 | 广州市广材试验仪器有限公司 | Vibrating string extensometer marking apparatus |
| CH713460A2 (en) * | 2017-02-15 | 2018-08-15 | Digi Sens Ag | Swing string sensor and swinging string for a swinging string sensor. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208936950U (en) * | 2018-11-30 | 2019-06-04 | 河南省计量科学研究院 | A kind of calibrating device for vibrating string type strain transducer clamping device |
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