CN113739691A - Strain type displacement sensor suitable for small and medium-sized actuator shaft and operation method - Google Patents
Strain type displacement sensor suitable for small and medium-sized actuator shaft and operation method Download PDFInfo
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- CN113739691A CN113739691A CN202110892839.0A CN202110892839A CN113739691A CN 113739691 A CN113739691 A CN 113739691A CN 202110892839 A CN202110892839 A CN 202110892839A CN 113739691 A CN113739691 A CN 113739691A
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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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
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a strain displacement sensor suitable for small and medium-sized actuator shafts and an operation method, comprising the following steps: an elastic member, a strain gauge member, and a connection flange unit; the connection flange unit includes: an upper connecting flange part and a lower connecting flange part; the upper connecting flange part is arranged on the upper part of a strain type displacement sensor suitable for a small and medium-sized actuator shaft; the lower connecting flange part is arranged at the lower part of a strain type displacement sensor suitable for a small and medium-sized actuator shaft; the elastic part adopts a spring steel reed structure; the strain gauge part is arranged on the spring steel reed structure; the contact type measuring method based on the resistance strain gauge has the advantages of high sensitivity, high measuring precision, wide measuring range, small size and weight and the like.
Description
Technical Field
The invention relates to the technical field of strain type displacement sensors, in particular to a strain type displacement sensor suitable for small and medium-sized actuator shafts and an operation method.
Background
The displacement measurement has a wide application range and is very important in the tests of mechanisms, structures, thermal deformation and the like. At present, non-contact methods such as photo-optics and laser displacement meters based on digital image correlation methods have become the main means for displacement measurement, but are often limited by test environments and measurement conditions and cannot be used.
Based on the advantages of high sensitivity, high measurement precision, wide measurement range, small size and weight and the like of the contact type measurement method of the resistance strain gage, the strain gage measurement method appears, but is limited to the measurement of a beam structure, in order to meet the strain measurement of a shafting assembly,
patent document CN103090778B discloses a strain type linear bidirectional large displacement sensor and a detection method thereof, wherein the sensor is characterized in that a displacement strain conversion beam is provided with a strain gauge and forms a bridge connection with a strain gauge, the fixed end of the displacement strain conversion beam is fixed on a measuring point, and the free end is inserted into a rigid guide groove and fixed at a reference position; the detection method is that when the measuring point is displaced, the displacement of the rigid guide groove and the strain at the strain gauge on the displacement strain conversion beam are in a linear relationship, the strain gauge records the strain value when the measuring point is displaced, and the recorded strain value determines the displacement value of the measuring point according to a calibrated strain and displacement relational expression. There is still room for improvement in structural and technical performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a strain type displacement sensor suitable for small and medium-sized actuator shafts and an operation method.
According to the invention, the strain displacement sensor suitable for the small and medium-sized actuator shaft comprises: an elastic member, a strain gauge member, and a connection flange unit; the connection flange unit includes: an upper connecting flange part and a lower connecting flange part 3; the upper connecting flange part is arranged on the upper part of a strain type displacement sensor suitable for a small and medium-sized actuator shaft; the lower connecting flange part 3 is arranged at the lower part of a strain type displacement sensor suitable for a small and medium-sized actuator shaft; the elastic part adopts a spring steel reed structure 1; the strain gage elements are arranged on a spring steel leaf structure 1.
Preferably, the elasticity of the spring steel reed structure 1 is greater than a set threshold.
Preferably, the method further comprises the following steps: an actuator shaft;
the upper connecting flange part adopts an end connecting flange 4;
the lower attachment flange part 3 is connected to the actuator shaft.
Preferably, the method further comprises the following steps: a laser displacement sensor measurement system 5;
and the laser displacement sensor measuring system 5 is connected with an actuator shaft.
Preferably, the method further comprises the following steps: a strain data acquisition system 6;
and the strain data acquisition system 6 is connected with the spring steel reed structure 1.
Preferably, the strain gauge part adopts a unidirectional strain gauge 2;
the number of the unidirectional strain gauges 2 is four;
the unidirectional strain gauges 2 are symmetrically arranged.
The invention provides an operation method of a strain type displacement sensor suitable for a small and medium-sized actuator shaft.
Compared with the prior art, the invention has the following beneficial effects:
1. the contact type measuring method based on the resistance strain gauge has the advantages of high sensitivity, high measuring precision, wide measuring range, small size and weight and the like;
2. the invention carries out the design of type spectrum, and has strong measurement task adaptability of the displacement of the medium and small actuators through the modification of the characteristic dimension;
3. the invention has reasonable structure and convenient use and can overcome the defects of the prior art.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic view of a strain gauge displacement sensor according to the present invention.
Fig. 2 is a schematic diagram of a method for calibrating a strain-gauge displacement sensor according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a strain type displacement sensor suitable for small and medium-sized actuators and a calibration method thereof. A high-elasticity spring steel reed structure is used as an elastic element, and the simulation analysis ensures that enough strain output can be ensured under the condition of large deformation to meet the requirement of measurement accuracy. Four strain gauges are symmetrically adhered to the reed, the displacement-strain relationship between two end faces of the reed is calibrated in a test in advance, and the displacement is monitored through the acquired strain by utilizing the relationship. The invention realizes the high-precision measurement of the displacement of the movable parts such as the actuator shaft and the like, and has the advantages of simple structure, high sensitivity, easy calibration and good reliability.
As shown in figure 1, the strain displacement sensor suitable for the medium and small actuators and the calibration method thereof are characterized in that the strain displacement sensor suitable for the medium and small actuators mainly comprises a high-elasticity spring steel reed structure, a strain gauge, a connecting flange of a movable part body such as an actuator shaft and the like, a connecting flange of a shaft end part and the like, and a calibration device comprises a laser displacement sensor measuring system, a strain acquisition system and the like.
The working process of the strain displacement sensor suitable for the small and medium-sized actuators is divided into: a measurement process and a calibration process.
The measurement process is as follows:
1. sleeving a strain type displacement sensor at the end part of an actuator shaft through a flange;
2. and obtaining the displacement of the actuator shaft by combining each strain reading obtained by the strain measurement system with the displacement-strain coefficient calibrated in advance.
The calibration process is as follows:
1. carrying out displacement measurement on the end part of the actuator shaft by using a laser displacement sensor, and simultaneously obtaining each strain reading through a strain measurement system;
2. let the strains of four strain gauges be respectively epsiloni(i ═ 1,2,3,4), the laser displacement sensor reading (customizable actuator shaft zero motion) is S.
The coefficients that need to be calibrated can be described by the following mathematical model.
S＝a1ε1+a2ε2+a3ε3+a4ε4+b
In the formula ofi(i is 1,2,3,4) is the strain value output by the ith strain channel, S is the displacement value of the end part of the actuator shaft, b is the fixed value deviation of the displacement measurement result, aiAnd (i ═ 1,2,3,4) is the coefficient to be calibrated.
Four-time measurement is carried out to obtain four groups of displacement values Si(i ═ 1,2,3,4) and strain value ε of each corresponding strain gaugeij( i 1,2,3,4, j 1,2,3,4) and solving the following system of equations to obtain the calibration coefficient ai(i＝1,2,3,4):
The invention provides a strain type displacement sensor suitable for small and medium-sized actuators and a calibration method thereof. Both the numerical calculation and the test design result show that the method has higher measurement precision and stability.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (7)
1. The utility model provides a strain displacement sensor suitable for middle-size and small-size actuator axle which characterized in that includes: an elastic member, a strain gauge member, and a connection flange unit;
the connection flange unit includes: an upper connecting flange part and a lower connecting flange part (3);
the upper connecting flange part is arranged on the upper part of a strain type displacement sensor suitable for a small and medium-sized actuator shaft;
the lower connecting flange part (3) is arranged at the lower part of a strain type displacement sensor suitable for small and medium-sized actuator shafts;
the elastic part adopts a spring steel reed structure (1);
the strain gauge part is arranged on the spring steel reed structure (1).
2. A strain displacement sensor adapted for small and medium actuator shafts according to claim 1, characterized in that the elasticity of the spring steel leaf structure (1) is greater than a set threshold.
3. The strain displacement sensor suitable for small and medium-sized actuator shafts as claimed in claim 1, further comprising: an actuator shaft;
the upper connecting flange part adopts an end connecting flange (4);
the lower connecting flange part (3) is connected with an actuator shaft.
4. A strain displacement transducer adapted for use with a small to medium actuator shaft as claimed in claim 3, further comprising: a laser displacement sensor measuring system (5);
and the laser displacement sensor measuring system (5) is connected with the actuator shaft.
5. The strain displacement sensor suitable for small and medium-sized actuator shafts as claimed in claim 4, further comprising: a strain data acquisition system (6);
and the strain data acquisition system (6) is connected with the spring steel reed structure (1).
6. The strain displacement sensor suitable for the small and medium-sized actuator shafts as claimed in claim 1, wherein the strain gauge part adopts a unidirectional strain gauge (2);
the number of the unidirectional strain gauges (2) is four;
the unidirectional strain gages (2) are symmetrically arranged.
7. An operation method of a strain type displacement sensor suitable for a small and medium-sized actuator shaft is characterized in that the strain type displacement sensor suitable for the small and medium-sized actuator shaft in any one of claims 1 to 6 is adopted to obtain displacement information of the actuator shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110892839.0A CN113739691A (en) | 2021-08-04 | 2021-08-04 | Strain type displacement sensor suitable for small and medium-sized actuator shaft and operation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110892839.0A CN113739691A (en) | 2021-08-04 | 2021-08-04 | Strain type displacement sensor suitable for small and medium-sized actuator shaft and operation method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002195805A (en) * | 2000-12-26 | 2002-07-10 | Shimadzu Corp | Strain gauge type displacement gauge |
| CN201335679Y (en) * | 2009-01-22 | 2009-10-28 | 四川大学 | Strain-type internal-displacement tester for measuring internal displacement of geo-mechanical models |
| CN103090778A (en) * | 2012-12-20 | 2013-05-08 | 太原理工大学 | Strain type linear bidirectional large displacement sensor and detection method thereof |
| CN104734559A (en) * | 2015-03-17 | 2015-06-24 | 西安交通大学 | Marching type piezoceramic actuator and method having displacement measurement function and large push-pull force |
| CN205138415U (en) * | 2015-09-25 | 2016-04-06 | 广州汽车集团股份有限公司 | Answer variant displacement measurement device |
| US20160178342A1 (en) * | 2014-12-18 | 2016-06-23 | Airbus Operations (S.A.S.) | Device and method for measuring displacement between two substantially coaxial parts, preferably for aircraft |
| CN208443332U (en) * | 2018-07-26 | 2019-01-29 | 辽宁工业大学 | Measure the resistance-strain type bilateral displacement sensor of reinforced concrete member deformation |
| CN209446021U (en) * | 2018-12-22 | 2019-09-27 | 中国计量科学研究院 | A kind of strain gauge caliberating device |
-
2021
- 2021-08-04 CN CN202110892839.0A patent/CN113739691A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002195805A (en) * | 2000-12-26 | 2002-07-10 | Shimadzu Corp | Strain gauge type displacement gauge |
| CN201335679Y (en) * | 2009-01-22 | 2009-10-28 | 四川大学 | Strain-type internal-displacement tester for measuring internal displacement of geo-mechanical models |
| CN103090778A (en) * | 2012-12-20 | 2013-05-08 | 太原理工大学 | Strain type linear bidirectional large displacement sensor and detection method thereof |
| US20160178342A1 (en) * | 2014-12-18 | 2016-06-23 | Airbus Operations (S.A.S.) | Device and method for measuring displacement between two substantially coaxial parts, preferably for aircraft |
| CN104734559A (en) * | 2015-03-17 | 2015-06-24 | 西安交通大学 | Marching type piezoceramic actuator and method having displacement measurement function and large push-pull force |
| CN205138415U (en) * | 2015-09-25 | 2016-04-06 | 广州汽车集团股份有限公司 | Answer variant displacement measurement device |
| CN208443332U (en) * | 2018-07-26 | 2019-01-29 | 辽宁工业大学 | Measure the resistance-strain type bilateral displacement sensor of reinforced concrete member deformation |
| CN209446021U (en) * | 2018-12-22 | 2019-09-27 | 中国计量科学研究院 | A kind of strain gauge caliberating device |
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