CN108267118B - Strain type intelligent inclinometer - Google Patents
Strain type intelligent inclinometer Download PDFInfo
- Publication number
- CN108267118B CN108267118B CN201810339525.6A CN201810339525A CN108267118B CN 108267118 B CN108267118 B CN 108267118B CN 201810339525 A CN201810339525 A CN 201810339525A CN 108267118 B CN108267118 B CN 108267118B
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- China
- Prior art keywords
- dowel bar
- strain gauge
- strain
- mass block
- resistance
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- 239000012791 sliding layer Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/02—Details
- G01C9/06—Electric or photoelectric indication or reading means
Abstract
A strain type intelligent inclinometer comprises a rectangular shell (1), a dowel bar (2), a mass block (5), a resistance strain gauge (3), a sliding layer (4), an end cover (6) and a detection circuit. The strain intelligent inclinometer is attached to the surface of a structure through an instrument contact surface (7), if the surface of the structure has an inclination angle, a mass block of the inclinometer can generate a downward sliding force to act on a dowel bar under the action of gravity, the dowel bar elastically deforms under the action of external force, a resistance strain gauge attached to the surface of the dowel bar also deforms along with the dowel bar, after the resistance strain gauge deforms, the resistance value changes, the resistance change is converted into voltage change, namely an electric signal through a corresponding measuring bridge, the process of converting the inclination angle change into the electric signal is realized, and the inclination direction is accurately judged through the positive and negative values of the two resistance strain gauges on the dowel bar.
Description
Technical Field
The invention relates to a strain type intelligent inclinometer, and belongs to the technical field of civil engineering structure detection.
Background
Structural inspection has attracted more and more attention as an important element of the civil engineering field. The inclination of the surface of the structure not only relates to the external appearance of the structure, but also influences the safety and stability of the whole structure. Therefore, in some parts with high requirements on flatness and perpendicularity, the inclinometry is particularly important.
At present, the traditional inclinometer is basically composed of a gravity pointer, a dial and a measuring base, is designed by utilizing the gravity characteristic of the pointer, and has low precision and poor durability. When the inclination angle of the structure to be detected exists, the mass block can generate a sliding force to act on the dowel bar, the dowel bar drives the resistance strain gauge adhered to the dowel bar to deform together, the resistance value of the strain gauge changes, and therefore the inclination angle is converted into the change of a voltage signal, and the accurate measurement of the inclination angle is realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a strain type intelligent inclinometer and a measuring method, which can rapidly and accurately judge the inclination direction of the surface of a structure and accurately measure the inclination angle.
The strain intelligent inclinometer comprises a rectangular shell, a dowel bar, a mass block, a resistance strain gauge, a sliding layer, an end cover and a detection circuit; the mass block is of a cylindrical structure and is arranged in the middle section of the cylindrical inner cavity of the rectangular shell; one end of the rectangular shell is closed, an end cover is arranged at one end of the rectangular shell, the cross section in the length direction of the rectangular shell is square in appearance, and the inner cavity of the rectangular shell is circular; the centers of the two ends of the mass block are respectively provided with a dowel bar which coincides with the center line of the mass block, the end part of one dowel bar is abutted against the closed end of the square shell, and the end part of the other dowel bar is abutted against the end cover of the square shell; resistance strain gauges are respectively stuck on the two dowel bars; a cylindrical sliding layer is arranged at the contact position of the inner side surface of the rectangular shell and the mass block, and the mass block can do friction-free horizontal movement on the sliding layer; a strain gauge is respectively stuck on the upper surface and the lower surface in the rectangular shell and is used as a temperature compensation strain gauge.
The upper surface and the lower surface of the square shell are measuring surfaces which are in contact with the structural object; and the axis formed by the dowel bar and the mass block is parallel to the upper surface and the lower surface of the square shell.
The detection unit is a resistance strain gauge; the resistance strain gauge is connected with the measuring circuit through a wire.
The dowel bar is an equal-strength bar, and the cross section of the dowel bar is circular.
The resistance strain gauge is stuck to the middle part of the dowel bar.
The testing method of the strain intelligent inclinometer comprises the following steps:
(1) The strain type intelligent inclinometer is fixedly arranged on a measuring surface contacted with a structure;
(2) If the inclination angle of the contact surface exists, a mass block in the strain intelligent inclinometer can generate a sliding force to act on the dowel bar, and the resistance value of a resistance strain gauge on the dowel bar is changed;
(3) The resistance change is converted into voltage change, namely electric signal, through a corresponding measuring bridge circuit, so that the process of converting angle change into electric signal is realized, and the inclination angle is displayed in the form of electric signal;
(4) The inclination direction is accurately judged through the positive and negative values of the two resistance strain gages on the dowel bar, and the side with the strain being positive is the tension side of the dowel bar, namely the side with the higher vertical level.
The working principle of the strain intelligent inclinometer is that the contact surface of the instrument is attached to the surface of a structure, and because of the inclination angle of the surface of the structure, a mass block can generate a sliding force to act on a dowel bar under the action of gravity, and a smooth layer is arranged between the mass block and the inner surface of the instrument, so that the sliding force is strictly as follows:
F＝Mg·sinθ
the dowel bar generates elastic deformation under the action of external force, so that the resistance strain gauge adhered to the surface of the dowel bar also generates deformation along with the deformation, after the resistance strain gauge is deformed, the resistance value is changed, and the resistance change is converted into voltage change, namely an electric signal, through a corresponding measuring bridge, thereby realizing the process of converting angle change into the electric signal.
The inclination direction is accurately judged through the positive and negative values of the two resistance strain gages on the dowel bar, and the side with the strain being positive is the tension side of the dowel bar, namely the side with the higher vertical level.
The invention has the advantages of convenient use, high measurement speed, high measurement precision, strong applicability and less influence by environmental conditions when being used for measuring the inclined direction and angle of the surface of the structure.
Drawings
FIG. 1 is a schematic diagram of a strain intelligent inclinometer of the present invention;
FIG. 2 is a block diagram of the measurement flow of the strain intelligent inclinometer of the present invention;
in the figure, 1 is a rectangular housing; 2 is a dowel bar; 3 is a resistance strain gauge; 4 is a sliding layer; 5 is a mass; 6 is an end cap; 7 is the contact surface.
Detailed Description
An embodiment of the present invention is shown in fig. 1.
The embodiment of the strain intelligent inclinometer comprises a rectangular shell 1, a dowel bar 2, a mass block 5, a resistance strain gauge 3, a sliding layer 4, an end cover 6 and a detection circuit; the mass block 5 is of a cylindrical structure and is arranged in the middle section of the cylindrical inner cavity of the rectangular shell 1; one end of the rectangular shell 1 is closed, an end cover is arranged at one end of the rectangular shell, the cross section in the length direction of the rectangular shell is square in appearance, and the inner cavity of the rectangular shell is circular; dowel bars 2 which are coincident with the center lines of the mass blocks are respectively arranged at the centers of the two ends of the mass blocks 5; the end part of one dowel bar is abutted against the closed end of the square shell, and the end part of the other dowel bar is abutted against the end cover of the square shell; the two dowel bars are respectively stuck with a resistance strain gauge 3; a cylindrical sliding layer 4 is arranged at the contact position of the inner side surface of the rectangular shell 1 and the mass block 5, and the mass block 5 can do friction-free horizontal movement on the sliding layer 4; a strain gauge is stuck on the upper and lower top surfaces in the rectangular casing 1 as a temperature compensation strain gauge.
The upper surface and the lower surface of the square 1 are measuring surfaces which are contacted with a structural object; the axis formed by the dowel bar 2 and the mass block 5 is parallel to the upper surface and the lower surface of the square shell 1.
The working principle of the strain intelligent inclinometer is that an instrument contact surface is attached to the surface of a structural object, and due to the fact that the inclination angle of the surface of the structural object exists, a mass block 5 can generate a sliding force to act on a dowel bar 2 under the action of gravity, and a sliding layer 4 is arranged between the mass block 5 and the inner surface of a rectangular shell of the instrument, so that the sliding force is strictly equal to:
F＝Mg·sinθ
wherein F is the sliding force; m is the mass of the mass block; g is gravity acceleration; θ is the structure surface inclination angle.
The dowel bar 2 generates elastic deformation under the action of external force, so that the resistance strain gauge 3 adhered to the surface of the dowel bar also generates deformation along with the deformation, after the resistance strain gauge 3 is deformed, the resistance value is changed, and the resistance change is converted into voltage change, namely electric signal, through a corresponding measuring bridge, thereby realizing the process of converting angle change into electric signal.
The inclination direction is accurately judged through the positive and negative values of the two resistance strain gages 3 on the dowel bar 2, and the side with the strain being positive is the tension side of the dowel bar 2, namely the side with the higher vertical level.
The inclinometer has higher precision requirement, so that the material of the dowel bar 2 is high-quality alloy steel, and the required strength is high; the elasticity is good; has high yield strength; when bearing heavy load, the plastic deformation is not caused; has high fatigue strength and long service life under the repeated action of load.
A test method of the strain intelligent inclinometer is shown in FIG. 2.
When the contact surface of the strain intelligent inclinometer is attached to the surface of a structure, the mass block 5 in the inclinometer can generate a sliding force to act on the dowel bar 2 under the action of gravity due to the existence of the inclination angle of the surface of the structure; under the action of the downward sliding force, the resistance value of the resistance strain gauge on the dowel bar is changed; the measuring bridge circuit converts the resistance change into voltage change, namely electric signal, thereby realizing the process of converting angle change into electric signal; the electric signal is amplified and filtered, and the inclination angle is displayed in the form of electric signal through a display.
Claims (6)
1. The strain type intelligent inclinometer is characterized by comprising a rectangular shell, a dowel bar, a mass block, a resistance strain gauge, a sliding layer, an end cover and a detection and display circuit; the mass block is of a cylindrical structure and is arranged in the middle section of the cylindrical inner cavity of the rectangular shell; one end of the rectangular shell is closed, an end cover is arranged at one end of the rectangular shell, the cross section in the length direction of the rectangular shell is square in appearance, and the inner cavity of the rectangular shell is circular; the centers of the two ends of the mass block are respectively provided with a dowel bar which coincides with the center line of the mass block, the end part of one dowel bar is abutted against the closed end of the square shell, and the end part of the other dowel bar is abutted against the end cover of the square shell; resistance strain gauges are respectively stuck on the two dowel bars; a cylindrical sliding layer is arranged at the contact position of the inner side surface of the rectangular shell and the mass block, and the mass block can do friction-free horizontal movement on the sliding layer; a strain gauge is respectively stuck on the upper surface and the lower surface in the rectangular shell and is used as a temperature compensation strain gauge.
2. The intelligent strain inclinometer of claim 1, wherein the upper and lower surfaces of the square housing are measuring surfaces in contact with a structure; and the axis formed by the dowel bar and the mass block is parallel to the upper surface and the lower surface of the square shell.
3. The intelligent strain gauge of claim 1, wherein the resistance strain gauge is connected to the measuring and display circuit by a wire.
4. The intelligent strain gauge of claim 1, wherein the dowel bar is an equal strength bar and is circular in cross section.
5. The intelligent strain gauge of claim 1, wherein the resistive strain gauge is attached to the middle portion of the dowel bar.
6. The intelligent strain inclinometer of claim 1, wherein the testing method of the detector is as follows:
(1) The strain type intelligent inclinometer is fixedly arranged on a measuring surface contacted with a structure;
(2) If the inclination angle of the contact surface exists, a mass block in the strain intelligent inclinometer can generate a sliding force to act on the dowel bar, and the resistance value of a resistance strain gauge on the dowel bar is changed;
(3) The resistance change is converted into voltage change, namely electric signal, through a corresponding measuring bridge circuit, so that the process of converting angle change into electric signal is realized, and the inclination angle is displayed in the form of electric signal;
(4) The inclination direction is accurately judged through the positive and negative values of the two resistance strain gages on the dowel bar, and the side with the strain being positive is the tension side of the dowel bar, namely the side with the higher vertical level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810339525.6A CN108267118B (en) | 2018-04-16 | 2018-04-16 | Strain type intelligent inclinometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810339525.6A CN108267118B (en) | 2018-04-16 | 2018-04-16 | Strain type intelligent inclinometer |
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| Publication Number | Publication Date |
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| CN108267118A CN108267118A (en) | 2018-07-10 |
| CN108267118B true CN108267118B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810339525.6A Active CN108267118B (en) | 2018-04-16 | 2018-04-16 | Strain type intelligent inclinometer |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159255A (en) * | 2019-07-02 | 2019-08-23 | 中国矿业大学(北京) | A kind of the gas drilling inclinometer and implementation method of based superconductive sliding block variable resistance thought |
| CN113655729B (en) * | 2021-10-20 | 2021-12-14 | 北京创米智汇物联科技有限公司 | Control device, control method, control system, and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6413414A (en) * | 1987-07-08 | 1989-01-18 | Ricoh Kk | Inclination sensor |
| CN2684149Y (en) * | 2003-07-25 | 2005-03-09 | 金坛市土木工程仪器厂 | Differential vibratory string type inclinometer |
| CN203385414U (en) * | 2013-06-26 | 2014-01-08 | 湖南北斗星空检测科技有限公司 | High intelligent automation inclinometer |
| CN103528723A (en) * | 2013-10-08 | 2014-01-22 | 重庆长安汽车股份有限公司 | Two-force rod axial force measuring method |
| CN107860507A (en) * | 2017-10-31 | 2018-03-30 | 南京卓砾智测控技术有限公司 | Pressure sensor calibration force snesor and its calibration method |
| CN207991524U (en) * | 2018-04-16 | 2018-10-19 | 华东交通大学 | A kind of strain-type intelligent inclinometer |
-
2018
- 2018-04-16 CN CN201810339525.6A patent/CN108267118B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6413414A (en) * | 1987-07-08 | 1989-01-18 | Ricoh Kk | Inclination sensor |
| CN2684149Y (en) * | 2003-07-25 | 2005-03-09 | 金坛市土木工程仪器厂 | Differential vibratory string type inclinometer |
| CN203385414U (en) * | 2013-06-26 | 2014-01-08 | 湖南北斗星空检测科技有限公司 | High intelligent automation inclinometer |
| CN103528723A (en) * | 2013-10-08 | 2014-01-22 | 重庆长安汽车股份有限公司 | Two-force rod axial force measuring method |
| CN107860507A (en) * | 2017-10-31 | 2018-03-30 | 南京卓砾智测控技术有限公司 | Pressure sensor calibration force snesor and its calibration method |
| CN207991524U (en) * | 2018-04-16 | 2018-10-19 | 华东交通大学 | A kind of strain-type intelligent inclinometer |
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