CN105222696A - The high and cold LVDT measurement mechanism of high temperature and measuring method - Google Patents
The high and cold LVDT measurement mechanism of high temperature and measuring method Download PDFInfo
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- CN105222696A CN105222696A CN201510698029.6A CN201510698029A CN105222696A CN 105222696 A CN105222696 A CN 105222696A CN 201510698029 A CN201510698029 A CN 201510698029A CN 105222696 A CN105222696 A CN 105222696A
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Abstract
The invention belongs to indoor rock field tests, particularly the high and cold LVDT measurement mechanism of high temperature and measuring method, comprise attachment device and LVDT sensor; The removable bottom of attachment device is between first half empty van, Lower Half empty van, and movable panel is at first half empty van top; Spring upper and lower side is separately fixed on movable panel and removable bottom; Bar core upper end is fixed on removable bottom, and lower end is connected in stationary installation at the bottom of Lower Half empty van case, and stationary installation has the displacement space eliminating bar core; LVDT sensor vertical is arranged in Lower Half empty van, and measuring head contacts without pressure with the lower surface of removable bottom.First measure bar core compression displacement ε under room temperature and specified temp of attachment device
1, ε
2, calculate the inductive coil error that this specified temp causes; Measure the displacement ε of rock sample with specified temp environment
3; Calculate the absolute displacement ε of rock sample
4=ε
3+ (ε
1-ε
2).Should apply on general shop experiment instrument by device, test error is little, and measuring accuracy is high, reliable results.
Description
Technical field
The invention belongs to indoor rock field tests, particularly the high and cold LVDT measurement mechanism of high temperature and measuring method.
Background technology
The high and cold disaster of high temperature becomes the common disaster of one of subterranean tunnel and slope project.Along with the needs that engineering construction and the mankind fix, a large amount of deep tunnel is by the region passing through complicated geological, neotectonism and underground heat, low-temp low-pressure environment enlivens.Temperatures as high in the usual earth's crust 1000 DEG C, and the temperature in the coldest place of earth surface is low reaches-90 DEG C.So buried hard rock tunnel will be subject to the impact of high temperature, and plateau side slope and tunnel's entrance and exit are subject to again high and cold effect, and the impact causing surveying instrument due to environment is existed error by this.As the security protection vcehicular tunnel of Japan, maximum buried depth 700m, ground temperature 75 DEG C; Chinese yunnan Dali is to the Gaoligong Shan Mountain tunnel of Ruili railway, and major principal stress is 15 ~ 28MPa, and maximum temperature is up to 50 DEG C; Tunnel, mountain, Osaka height above sea level 3490m of Qinghai, the phase in winter reaches 228d, and Annual lowest climate temperature is-34 DEG C; Kunlun mountain tunnel height above sea level 4600m, the lowest temperature is-36 DEG C.In addition, no matter be shop experiment or field monitoring, instrument all will be in high temperature psychro-environment for a long time, and therefore this patent more stresses the accuracy that rock displacements is measured under condition steady in a long-term.
In current rock mechanics shop experiment at home, the axial deformation method of testing except resistance strain gage, does not adopt substantially as other method of testings such as linear variable difference transformer (LVDT) measurements.And the method for testing of resistance strain gage is very easily by influence of temperature change, in high temperature psychro-environment, the impact of temperature cannot be eliminated at all.American Society Testing and Materials advises using strain ga(u)ge in shop experiment standard method, or LVDT sensor displacement measuring device, define the requirement of the precision of axial deformation survey sensor and the resolution of Acquisition Instrument, but do not specify or or suggestion how to eliminate the method for the axial LVDT sensor error brought affected by environment.Adopt LVDT sensor to measure rock deformation in high temperature psychro-environment if simple, then easily cause comparatively big error.And current domestic method of testing does not almost relate to surveying instrument at the medial error analysis of high temperature psychro-environment and removing method, a kind of axial deformation of rock sample measuring method disclosed in the patent No. 201310172397.8, mainly eliminates system variant and interface effect; LVDT formula displacement transducer disclosed in the patent No. 201420145413.4 and carload measuring system are only adopt dust cover to ensure that sensor does not disturb by dust.
Summary of the invention
For above-mentioned technical matters, the invention provides device and the measuring method of measuring rock sample in shop experiment of a kind of measuring accuracy, reliable results.
Concrete technical scheme is:
The high and cold LVDT measurement mechanism of high temperature, comprises attachment device and LVDT sensor;
Described attachment device, comprises spring, bar core, removable bottom, movable panel, first half empty van, Lower Half empty van.Removable bottom is between first half empty van, Lower Half empty van, and movable panel is at first half empty van top; Described spring is vertically mounted in first half empty van, and spring upper and lower side is separately fixed on movable panel and removable bottom; Described bar core is vertically fixed in Lower Half empty van, and bar core upper end is fixed on removable bottom, and lower end is connected in stationary installation at the bottom of Lower Half empty van case, and stationary installation has the displacement space eliminating bar core;
Described LVDT sensor, comprises outer tube, fixed bar, induction core, interior pipe, measuring head; Measuring head is arranged at outer tube top, and measuring head has temperature-insulating cover; Temperature insulating material is filled with between outer tube and interior pipe; Be fixed on the bottom of outer tube bottom interior pipe, top is fixed with spring-compressed resilient mounting, and the inwall of interior pipe has inductive coil, and there is induction core at the center of inductive coil; Induction core is connected with fixed bar by spring-compressed resilient mounting, and fixed bar is installed within the outer tube, and the fixed bar other end connects measuring head; Inductive coil is connected with external unit by Wire outlet end-coer; Outer tube outer wall has top fixed support and bottom fixed support;
Described LVDT sensor vertical is arranged in Lower Half empty van, and measuring head contacts without pressure with the lower surface of removable bottom.
The measuring method of the high and cold LVDT measurement mechanism of high temperature, comprises the following steps:
(1) measuring head moves under the pressure of spring and the drive of removable bottom, fixed bar and induction core move along axis simultaneously, thus the mutual induction amount between change inductive coil, the displacement of induction core just becomes the real-time difference voltage signal of inductive coil from the cable output Wire outlet end-coer; Measure bar core compression displacement ε under room temperature and specified temp of attachment device
1, ε
2, calculate the inductive coil error that this specified temp causes;
(2) by top fixed support and bottom fixed support, LVDT sensor is arranged on tested rock sample, makes rock sample be in same specified temp environment, measure the displacement ε of rock sample
3;
(3) the absolute displacement ε of rock sample is calculated
4=ε
3+ (ε
1-ε
2).
The high and cold LVDT measurement mechanism of high temperature provided by the invention and measuring method, general shop experiment instrument is applied, comprises MTS, triaxial apparatus, flow graph etc., test error can rise within 1%, measuring accuracy is high, reliable results, and the method has feasibility.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is LVDT sensor construction schematic diagram of the present invention;
Fig. 3 is LVDT sensor operating principles schematic diagram of the present invention.
Embodiment
With specific embodiment, the present invention is described in further details by reference to the accompanying drawings.
The high and cold LVDT measurement mechanism of high temperature, comprises attachment device and LVDT sensor;
Described attachment device, comprises spring 1, bar core 2, removable bottom 3, movable panel 4, first half empty van 5, Lower Half empty van 6.Removable bottom 3 is between first half empty van 5, Lower Half empty van 6, and movable panel 4 is at first half empty van 5 top; Described spring 1 is vertically mounted in first half empty van 5, and spring 1 upper and lower side is separately fixed on movable panel 4 and removable bottom 3; Described bar core 2 is vertically fixed in Lower Half empty van 6, and bar core 2 upper end is fixed on removable bottom 3, and lower end is connected in stationary installation at the bottom of Lower Half empty van 6 casees, and stationary installation has the displacement space eliminating bar core 2;
Described LVDT sensor, comprises outer tube 7, fixed bar 8, induction core 9, interior pipe 10, measuring head 13; Measuring head 13 is arranged at outer tube 7 top, measuring head 13 has temperature-insulating cover 14; Temperature insulating material 18 is filled with between outer tube 7 and interior pipe 10; Be fixed on the bottom of outer tube 7 bottom interior pipe 10, top is fixed with spring-compressed resilient mounting 16, and the inwall of interior pipe 10 has inductive coil 11, and there is induction core 9 at the center of inductive coil 11; Induction core 9 is connected with fixed bar 8 by spring-compressed resilient mounting 16, and fixed bar 8 is arranged in outer tube 7, and fixed bar 8 other end connects measuring head 13; Inductive coil 11 is connected with external unit by Wire outlet end-coer 12; Outer tube 7 outer wall has top fixed support 15 and bottom fixed support 17;
Described LVDT sensor vertical is arranged in Lower Half empty van 6, and measuring head 13 contacts without pressure with the lower surface of removable bottom 3.
The measuring method of the high and cold LVDT measurement mechanism of high temperature, comprises the following steps:
(1) measuring head 13 moves under the pressure of spring 1 and the drive of removable bottom 3, fixed bar 8 and induction core 9 move along axis simultaneously, thus the mutual induction amount changed between inductive coil 11, the displacement of induction core 9 just becomes the real-time difference voltage signal of inductive coil 11 from the cable output Wire outlet end-coer 12; Measure bar core 2 compression displacement ε under room temperature and specified temp of attachment device
1, ε
2, calculate inductive coil 11 error that this specified temp causes;
(2) by top fixed support 15 and bottom fixed support 17, LVDT sensor is arranged on tested rock sample, makes rock sample be in same specified temp environment, measure the displacement ε of rock sample
3;
(3) the absolute displacement ε of rock sample is calculated
4=ε
3+ (ε
1-ε
2).
Gauge length between top fixed support 15 and bottom fixed support 17 is adjustable.
Fixed bar 8 in LVDT sensor and induction core 9 are iron-nickel alloy, and thermal expansivity is extremely low, can keep regular length in very wide temperature range, so supposition induction core is not by the impact of temperature; Due to the electromagnetic nature of LVDT itself, the electric parameter as two secondary coils can be subject to the impact of temperature variation; In addition, in actual test process, the high temperature Alpine-cold condition that LVDT experiences, also can produce incentive action to LVDT internal coil, produces an additional output to system.According to the real work situation of LVDT, the main error source that can analyze LVDT is the Parameters variation of LVDT internal coil under high temperature Alpine-cold condition, and then causes the change of LVDT coil characteristics.This measuring method is intended to the error that elimination temperature action produces on coil, and then obtains the absolute displacement values of rock sample.
Claims (2)
1. the high and cold LVDT measurement mechanism of high temperature, is characterized in that: comprise attachment device and LVDT sensor;
Described attachment device, comprises spring (1), bar core (2), removable bottom (3), movable panel (4), first half empty van (5), Lower Half empty van (6); Removable bottom (3) is positioned between first half empty van (5), Lower Half empty van (6), and movable panel (4) is at first half empty van (5) top; Described spring (1) is vertically mounted in first half empty van (5), and spring (1) upper and lower side is separately fixed on movable panel (4) and removable bottom (3); Described bar core (2) is vertically fixed in Lower Half empty van (6), bar core (2) upper end is fixed on removable bottom (3), lower end is connected in stationary installation at the bottom of Lower Half empty van (6) case, and stationary installation has the displacement space eliminating bar core (2);
Described LVDT sensor, comprises outer tube (7), fixed bar (8), induction core (9), interior pipe (10), measuring head (13); Measuring head (13) is arranged at outer tube (7) top, measuring head (13) has temperature-insulating cover (14); Temperature insulating material (18) is filled with between outer tube (7) and interior pipe (10); Interior pipe (10) bottom is fixed on the bottom of outer tube (7), top is fixed with spring-compressed resilient mounting (16), the inwall of interior pipe (10) has inductive coil (11), there is induction core (9) at the center of inductive coil (11); Induction core (9) is connected with fixed bar (8) by spring-compressed resilient mounting (16), fixed bar (8) is arranged in outer tube (7), and fixed bar (8) other end connects measuring head (13); Inductive coil (11) is connected with external unit by Wire outlet end-coer (12); Outer tube (7) outer wall has top fixed support (15) and bottom fixed support (17);
Described LVDT sensor vertical is arranged in Lower Half empty van (6), and measuring head (13) contacts without pressure with the lower surface of removable bottom (3).
2. the measuring method of the high and cold LVDT measurement mechanism of high temperature according to claim 1, is characterized in that: comprise the following steps:
(1) measuring head (13) moves under the pressure of spring (1) and the drive of removable bottom (3), fixed bar (8) and induction core (9) are moved along axis simultaneously, thus the mutual induction amount changed between inductive coil (11), the displacement of induction core (9) just becomes the real-time difference voltage signal of inductive coil (11) from the cable output Wire outlet end-coer (12); Measure bar core (2) compression displacement ε under room temperature and specified temp of attachment device
1, ε
2, calculate inductive coil (11) error that this specified temp causes;
(2) by top fixed support (15) and bottom fixed support (17), LVDT sensor is arranged on tested rock sample, makes rock sample be in same specified temp environment, measure the displacement ε of rock sample
3;
(3) the absolute displacement ε of rock sample is calculated
4=ε
3+ (ε
1-ε
2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (3)
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| CN107449457A (en) * | 2017-08-30 | 2017-12-08 | 宁波市鄞州通力液压电器厂 | Hydraulic pressure inductive displacement transducer guide pin bushing and its manufacture method |
| CN108956938A (en) * | 2018-05-25 | 2018-12-07 | 成都理工大学 | Frozen-thawed cycled rock deformation measuring device and its measurement method |
| CN112504862A (en) * | 2020-11-10 | 2021-03-16 | 中南大学 | Dynamic and static triaxial apparatus for controlling substrate suction and temperature |
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| CN203744913U (en) * | 2014-03-27 | 2014-07-30 | 深圳市信为科技发展有限公司 | LVDT type displacement sensor and automobile load measuring system |
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| CN107449457A (en) * | 2017-08-30 | 2017-12-08 | 宁波市鄞州通力液压电器厂 | Hydraulic pressure inductive displacement transducer guide pin bushing and its manufacture method |
| CN107449457B (en) * | 2017-08-30 | 2019-09-17 | 宁波市鄞州通力液压电器厂 | Hydraulic inductive displacement transducer guide sleeve and its manufacturing method |
| CN108956938A (en) * | 2018-05-25 | 2018-12-07 | 成都理工大学 | Frozen-thawed cycled rock deformation measuring device and its measurement method |
| CN108956938B (en) * | 2018-05-25 | 2023-07-07 | 成都理工大学 | Freeze-thawing cycle rock deformation measuring device and measuring method thereof |
| CN112504862A (en) * | 2020-11-10 | 2021-03-16 | 中南大学 | Dynamic and static triaxial apparatus for controlling substrate suction and temperature |
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| Publication number | Publication date |
|---|---|
| CN105222696B (en) | 2018-07-24 |
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