CN112325763B - Inspection device and inspection method for detecting mounting quality of mounted strain gauge - Google Patents
Inspection device and inspection method for detecting mounting quality of mounted strain gauge Download PDFInfo
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- CN112325763B CN112325763B CN202011034220.8A CN202011034220A CN112325763B CN 112325763 B CN112325763 B CN 112325763B CN 202011034220 A CN202011034220 A CN 202011034220A CN 112325763 B CN112325763 B CN 112325763B
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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
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
Abstract
The invention provides a device and a method for detecting the installation quality of an installed strain gauge, and belongs to the technical field of detection and test equipment. The inspection device for detecting the mounting quality of the mounted strain gauge comprises a device body, a cleaning assembly, a visual inspection module and a pressing module, wherein the cleaning assembly is arranged on the device body; the cleaning assembly is used for cleaning foreign matters on the strain gauge; the visual inspection module comprises a telescope module arranged on the device main body, and an eyepiece of the telescope module is provided with a centering line; the pressing module is arranged on the device main body and is provided with a pressing head and a pressure value display structure for displaying the magnitude of the downward pressure. The invention also provides a method for detecting the installation quality of the installed strain gauge. The invention provides a device and a method for detecting the installation quality of a mounted strain gauge, which can realize the purpose of carrying one tool to finish the inspection of a plurality of items and can realize the comprehensive inspection of the strain gauge.
Description
Technical Field
The invention belongs to the technical field of detection and test equipment, and particularly relates to a device and a method for detecting the installation quality of an installed strain gauge.
Background
The strain gauge is a common sensor for measuring strain of materials and structures, and is widely applied to strain measurement in various industries such as aerospace, rail vehicles, mechanical manufacturing, civil engineering construction and the like.
The strain gauges are thin-sheet type sensors, which may damage the strain gauges during installation. The mounting quality of the strain gauge directly influences the accuracy and effectiveness of strain data acquisition, and whether the detection data is effective or not is determined. Therefore, it is necessary to perform mounting quality inspection of the mounted strain gauge.
The existing implementation of the main inspection methods/procedures: 1. cleaning foreign matters, namely cleaning the surface and the periphery of the strain gauge by using a soft hair small brush or a blowing ball to ensure that no foreign matters exist on the surface and the periphery of the strain gauge; 2. the mounting position is checked, namely, a graduated scale is used for checking the strain gauge with a center mark and a test sample hand-drawn sticking position line for checking; 3. appearance inspection, namely, visually inspecting whether the appearance of the strain gauge is intact at a close distance; 4. and (4) checking the insulation resistance, namely checking the insulation resistance of the strain gauge and the tested piece.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: during inspection, various non-professional tools are needed, the difference between the tools and the operation method is large, and the result discreteness is large. For operators, the operation is complicated by using various detection tools, the operators are required to have certain experience, the operators are not specified/prompted by clear scales, and the examination is not comprehensive.
Disclosure of Invention
The invention aims to provide a device and a method for detecting the mounting quality of a mounted strain gauge, and aims to solve the technical problems that a special inspection device for inspecting the mounting quality of the mounted strain gauge is lacked in the market and the inspection is not comprehensive enough.
In one aspect, there is provided an inspection apparatus for post-installation strain gauge installation quality detection, comprising:
a device main body;
the cleaning assembly is arranged on the device main body and used for cleaning foreign matters on the strain gauge;
the visual inspection module comprises a telescope module arranged on the device main body, and a centering line used for detecting whether the mounting position of the strain gauge is correct or not is arranged on an eyepiece of the telescope module; and
and the pressing module is arranged on the device main body and is provided with a pressing head used for applying downward pressure to the strain gauge when the dynamic usability of the strain gauge is checked and a pressure value display structure used for displaying the magnitude of the downward pressure.
Furthermore, an accommodating cavity for accommodating the pressing module is arranged in the device main body;
the pressing module includes:
the elastic piece is arranged in the accommodating cavity in a telescopic manner along the depth direction of the accommodating cavity;
the pressure head pass through the elastic component with the device main part is connected, just the pressure head is kept away from the one end of elastic component extends to hold outside the chamber.
Further, the visual inspection module further comprises:
an illumination module disposed on the device body;
the lighting module includes:
the annular light source is arranged at one end, close to the objective lens, of the telescope module and is arranged around the objective lens; a power supply assembly disposed within the device body; and
a switch provided on the apparatus main body;
wherein the power supply assembly is electrically connected with the annular light source through the switch.
Further, the device body includes:
a transparent tube body having both ends open; and
the partition plate is arranged in the transparent tube body and divides an inner cavity of the transparent tube body into a first cavity and a second cavity, wherein the first cavity is arranged close to the pressure head and is the accommodating cavity; one end of the elastic piece, which is used for being connected with the device main body, is fixedly connected to the partition board;
the pressure value display structure includes:
the force indicating mark is positioned on the peripheral wall of one end of the pressure head, which is used for being connected with the elastic piece; and
and the pressure scale marks are positioned on the pipe wall of one end of the transparent pipe body, which is close to the pressure head.
Further, the telescope module is detachably arranged on the opening end of the second cavity, and the annular light source is arranged on the objective lens end of the telescope module;
the power supply assembly includes:
a battery disposed within the second cavity; and
and the electric connection assembly is arranged on the telescope module and used for electrically connecting the battery and the annular light source.
Further, the sweeping assembly comprises:
the mounting base is fixedly mounted on the telescope module;
the mounting head is detachably mounted on the mounting seat; and
and the hairbrush is arranged on the mounting head.
Further, the brush extends in a length direction of the device body.
One of the above technical solutions has the following beneficial effects: compared with the prior art, multiple functions are achieved, the purpose of carrying one tool to complete the inspection of multiple projects is achieved, tools do not need to be replaced for many times during the inspection of the installation quality of the strain gauge, certain practicability and applicability are achieved, operation is convenient, the using method is direct, clear data indication is provided for inspection projects, the use of different operators is guaranteed, the detection result is consistent, uncertainty caused by experience factors is eliminated, and errors are reduced. In addition, the inspection device for detecting the mounting quality of the mounted strain gauge provided by the embodiment of the invention is combined with a data acquisition device, and dynamic usability inspection of the strain gauge can be realized, which is not available in the prior art, and the inspection can further ensure that the strain gauge qualified through inspection can be normally used.
In another aspect, an inspection method for post-installation strain gauge installation quality detection is provided, based on the inspection apparatus for post-installation strain gauge installation quality detection, including the steps of:
cleaning foreign matters;
the mounting position and the appearance of the strain gauge are inspected through the visual inspection module;
measuring and checking resistance;
checking the dynamic availability;
wherein the dynamic availability checking step comprises the steps of:
connecting the strain gauge to a data acquisition device, and recording a strain value of the strain gauge when the strain gauge is not deformed;
applying down pressure to the strain gauge through the pressing module, and checking whether the strain value of the strain gauge responds correctly;
and removing the downward pressure, and checking whether the strain value of the strain gauge returns to the detection result when no deformation exists.
Further, a quasi-static accuracy checking step is included between the resistance measuring and checking step and the dynamic usability checking step;
the quasi-static accuracy checking step comprises the following steps:
connecting a strain gauge to a data acquisition device;
connecting a standard resistor in parallel on the strain gauge to obtain the strain value epsilon of the strain gauge and the standard resistor after being connected in parallelm；
According to
And
strain change calculation value epsilon after parallel standard resistance is obtained through calculationind(ii) a Wherein R ismIs the resistance value of the strain gauge, RshuntIs the resistance value of a standard resistor, R1The resistance value of the strain gauge and the standard resistor after being connected in parallel is shown, and S is the coefficient of the strain gauge;
comparison of εmAnd εindJudging whether the difference value of the two is within a preset range, if so, detecting the strain gauge to be qualified, and if not, judging that the difference value of the two is within the preset rangeAnd the strain gauge fails to detect.
Further, the step of checking whether the strain value of the strain gauge is correct in response comprises the following steps:
reading the pressure value of the downward pressure acting on the strain gauge according to the alignment condition of the force indication mark and the pressure scale mark;
estimating the strain change value of the strain gauge according to the pressure value;
acquiring a strain change value measured by the data acquisition device when the strain gauge is subjected to a downward pressure;
and comparing the estimated strain change value with the measured strain change value, and analyzing to determine whether the mounted strain gauge is reliable in measurement.
One of the above technical solutions has the following beneficial effects: compared with the prior art, the inspection device for detecting the mounting quality of the mounted strain gauge has basically the same technical effect. Meanwhile, the method for detecting the mounting quality of the mounted strain gauge can comprehensively and systematically detect the mounting quality of the strain gauge and the working state of the mounted strain gauge.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an inspection device for detecting mounting quality of a mounted strain gauge according to an embodiment of the invention;
FIG. 2 is an exploded view of an inspection apparatus for post-installation strain gauge mounting quality detection according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a centering line employed in an embodiment of the present invention;
FIG. 4 is a structural diagram illustrating a use state of the telescope module for detecting the installation position of the strain gauge according to the embodiment of the present invention;
FIG. 5 is a schematic diagram showing the relative positions of an inspection apparatus for post-installation strain gauge installation quality detection and a strain gauge according to an embodiment of the present invention before dynamic usability inspection, wherein the apparatus body is a perspective view; at this point, the force indicating mark 530 on the indenter 510 is aligned with the pressure scale 540 located at the lowermost portion of the transparent tube 110;
FIG. 6 is a schematic diagram showing the relative positions of an inspection apparatus for post-installation strain gauge installation quality detection and a strain gauge according to an embodiment of the present invention when performing a dynamic usability inspection, wherein the apparatus body is a perspective view;
FIG. 7 is a schematic diagram of a parallel circuit of a strain gauge and a standard resistor.
In the figure: 100. a device main body; 110. a transparent tube body; 120. a partition plate; 130. a first cavity; 140. a second cavity; 200. a sweeping assembly; 210. a mounting seat; 220. a mounting head; 230. a brush; 300. a strain gauge; 310. marking the center; 400. a visual inspection module; 410. a telescope module; 411. a lens barrel; 412. an objective lens; 413. a focus adjusting ring; 414. an eyepiece; 420. centering a line; 430. a lighting module; 431. an annular light source; 432. a power supply assembly; 433. a switch; 500. a pressing module; 510. a pressure head; 520. an elastic member; 530. a force indicating marker; 540. pressure scale lines; 600. and drawing a marking line on the sample piece by hand.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4 together, an inspection apparatus for detecting mounting quality of a mounted strain gauge according to an embodiment of the present invention will now be described. The inspection device for detecting the mounting quality of the mounted strain gauge includes a device body 100, a cleaning assembly 200 provided on the device body 100, a visual inspection module 400, and a pressing module 500 provided on the device body 100.
The cleaning assembly 200 is used for cleaning foreign matters on the strain gauge 300. The visual inspection module 400 includes a telescope module 410 provided on the apparatus main body 100, and a centering line 420 for detecting whether the mounting position of the strain gauge 300 is correct is provided on an eyepiece of the telescope module 410. The pressing module 500 is provided on the apparatus body 100, and has a pressing head 510 for applying a down force to the strain gauge 300 when performing a dynamic usability check of the strain gauge 300, and a pressure value display structure for displaying the magnitude of the down force.
For convenience of description, the following section will simplify the "inspection apparatus for post-installation strain gauge installation quality detection" to "inspection apparatus".
During the inspection, clear up strain gauge 300 surface through cleaning subassembly 200 earlier, prevent that foreign matters such as iron fillings dust from producing destruction or leading to strain gauge 300 to take place the short circuit phenomenon to strain gauge 300, protect strain gauge 300 and ensure the measured data validity, be convenient for develop follow-up inspection work simultaneously. The cleaning assembly 200 in this embodiment may be a brush 230, a blowing ball, or other body that can clean the strain gauge 300.
Thereafter, the mounting position of the strain gauge 300 is checked by the visual inspection module 400 and the appearance of the strain gauge 300 is checked. The purpose of the inspection of the mounting position of the strain gauge 300 is to inspect whether the strain gauge 300 is mounted at a design position, to ensure that the acquired data position coincides with the target position, and if the mounting position deviates from the design position, the strain gauge 300 needs to be removed and remounted. The appearance inspection of the strain gauge 300 is to check whether the appearance of the strain gauge 300 is intact, and if the appearance is damaged, the strain gauge 300 needs to be removed and reinstalled.
The telescope module 410 in this embodiment includes a lens barrel 411 provided on the apparatus main body 100, an objective lens 412 provided at one end of the lens barrel 411, a focus adjusting ring 413 screwed to the other end of the lens barrel 411, and an eyepiece 414 provided on the focus adjusting ring 413.
The specific operations of the installation position check of the strain gauge 300 and the appearance check of the strain gauge 300 by the visual inspection module 400 are as follows:
through the lens group of the telescope module 410, the centering line 420 on the centering eyepiece and the strain gauge 300 are provided with the center mark 310, the alignment condition of the hand-drawn mark line 600 on the sample piece and the centering line 420 is observed, so as to check whether the pasting position of the strain gauge 300 is correct or not, and the mounting position check of the strain gauge 300 is completed; as shown in fig. 4, when the centering line 420 and the strain gauge 300 are centered from the center mark 310, the centering line 420 and the hand mark line 600 on the sample piece are not overlapped, and it is determined that the mounting position of the strain gauge 300 is in a problem, and the strain gauge 300 needs to be cleaned and remounted;
the telescope module 410 performs an amplification check on the strain gauge 300 to determine whether the appearance of the strain gauge 300 is intact, thereby completing the appearance check of the strain gauge 300.
The resistance of strain gauge 300 is then measured and checked by means of a multimeter, as follows: the multimeter measures the resistance of the strain gauge 300, compares the resistance with a standard resistance value (provided by factory) of the strain gauge 300, if the resistance of the strain gauge 300 is within an error range, the resistance of the strain gauge 300 is determined to be qualified, the resistance data of the strain gauge 300 is recorded, and if the measured result exceeds the error range, the resistance of the strain gauge 300 is determined to be unqualified, and the strain gauge needs to be cleaned and reinstalled.
Finally, a dynamic usability check can be performed by the pressing module 500 applying a downward pressure to the strain gauge 300 with the strain gauge 300 connected to the data acquisition device. The specific operation is as follows:
electrically connecting the strain gauge 300 with a data acquisition device;
when the indenter 510 applies a downward pressure to the strain gauge 300, the pressure value display structure can display the magnitude of the downward pressure, and according to the pressure value, an operator can know the strain change value of the strain gauge 300 under the pressure according to experience;
by comparing the strain change values (which can be obtained empirically) with the readings of the strain gage 300 on the data acquisition device during pressing, a non-destructive pressing mode is implemented to dynamically check whether the measurement of the mounted strain gage 300 is reliable.
The pressure value display structure in this embodiment may be a sensor capable of detecting and displaying the pressure applied by the indenter 510 on the strain gauge 300, or other structures capable of implementing the above functions, and may be specifically set according to the use requirement.
Compared with the prior art, the inspection device for detecting the mounting quality of the mounted strain gauge, provided by the embodiment of the invention, has complete functions, realizes the purpose of carrying one tool to finish the inspection of a plurality of items, ensures that the tools do not need to be replaced for many times during the inspection of the mounting quality of the strain gauge, has certain practicability and applicability, is convenient to operate, has a direct use method, has clear data indication for the inspection items, ensures the use of different operators, has consistent detection results, eliminates uncertainty caused by experience factors, and reduces errors. In addition, the inspection device for the post-installation strain gauge installation quality detection provided by the embodiment of the invention is used in combination with a data acquisition device, so that the dynamic usability inspection of the strain gauge 300, which is not available in the prior art, can be realized, and the inspection can further ensure that the strain gauge 300 qualified by inspection can be normally used.
To avoid wear of the strain gage 300 during compression, the indenter 510 may be an elastic indenter 510, such as a rubber head.
The shape of the centering line 420 is matched with the hand-drawn marking line on the sample, and if the hand-drawn marking line on the common sample is a cross line, the centering line 420 is also a cross line, so that whether the centering line 420 is overlapped with the hand-drawn marking line on the sample can be judged more accurately, and the accuracy of the mounting position inspection result of the strain gauge 300 can be further ensured.
Referring to fig. 2, 5 and 6, as an embodiment of the inspection apparatus for detecting the mounting quality of the mounted strain gauge according to the present invention, an accommodating cavity for accommodating the pressing module 500 is formed in the apparatus main body 100.
The pressing module 500 includes an elastic member 520 provided in the receiving chamber to be stretchable in a depth direction of the receiving chamber. The ram 510 is connected to the apparatus body 100 through the elastic member 520, and an end of the ram 510 remote from the elastic member 520 extends outside the accommodating chamber.
The elastic member 520 in this embodiment may be a spring, a bellows, etc., as long as the above-described function is achieved. The accommodating cavity is arranged to accommodate the pressing module 500, so that the size of the inspection device is reduced, the elastic member 520 can stretch in a preset stretching direction, and the pressure of the pressure head 510 acting on the strain gauge 300 is stable and downward when the downward pressure is applied to the strain gauge 300 by the pressing module 500.
In order to ensure that the inspection apparatus can accurately inspect the appearance and the mounting position of the strain gauge 300 under poor light conditions, an illumination module 430 is additionally provided in the visual inspection module 400 in addition to the above-described embodiments. Referring to fig. 2, as an embodiment of the inspection apparatus for detecting the mounting quality of the mounted strain gauge according to the present invention, the visual inspection module 400 further includes an illumination module 430 disposed on the apparatus main body 100.
The illumination module 430 includes a ring-shaped light source 431, a power supply module 432 provided in the apparatus body 100, and a switch 433 provided on the apparatus body 100. The ring light source 431 is disposed at an end of the telescope module 410 near the objective lens and surrounds the objective lens. The power supply module 432 is electrically connected to the ring light source 431 through a switch 433.
The annular light source surrounds the objective lens, so that good illumination can be obtained when an operator inspects the appearance and the installation position of the strain gauge 300, and meanwhile, the inspection device is small in size and convenient to carry and take.
When the LED lamp is used, the switch 433 can be used for controlling the annular light source to be turned on and off, so that the electricity is saved.
The pressure value display structure may be a sensor capable of detecting and displaying the pressure applied by the indenter 510 to the strain gauge 300, or other structures capable of performing the above-described functions. Referring to fig. 5 and 6 together, in order to reduce the manufacturing cost of the inspection apparatus, as an embodiment of the inspection apparatus for detecting the mounting quality of the mounted strain gauge according to the present invention, the apparatus main body 100 includes a transparent tube 110 with both ends open, and a partition plate 120 disposed in the transparent tube 110. The partition 120 divides the inner cavity of the transparent tube 110 into a first cavity 130 and a second cavity 140, wherein the first cavity 130 is disposed near the ram 510 and is a containing cavity. One end of the elastic member 520 for connecting with the apparatus body 100 is fixedly connected to the partition 120;
the pressure value display structure includes a force indication mark 530 on an outer circumferential wall of an end of the pressure head for connecting with the elastic member 520, and a pressure scale 540 on a wall of the transparent tube body 110 at an end thereof adjacent to the pressure head 510.
The amount of pressure exerted by the indenter 510 on the strain gauge 300 can then be determined by comparing the alignment of the force indicator 530 and the pressure marks 540 with the transparent body 110. The whole pressure value display structure is simple in structure, low in manufacturing cost and not easy to damage.
To further reduce the size of the inspection apparatus, referring to fig. 2, as an embodiment of the inspection apparatus for detecting the mounting quality of the mounted strain gauge according to the present invention, a telescope module 410 is detachably disposed on the open end of the second cavity 140, and an annular light source 431 is disposed on the objective end of the telescope module 410.
The power supply module 432 includes a battery disposed in the second cavity 140, and an electrical connection module disposed on the telescope module 410 for electrically connecting the battery and the ring-shaped light source 431.
In this embodiment, the telescope module 410 can be inserted into the transparent tube 110, screwed or fixed on the corresponding end of the transparent tube 110 by other detachable connection methods. This arrangement facilitates both the installation or replacement of the telescope module 410 and the installation or replacement of the battery.
With the above arrangement, the internal space of the device main body 100 is effectively utilized, the volume of the inspection device is further reduced, and the device is convenient to carry and assemble.
The cleaning assembly 200 may be fixed to the apparatus main body 100 or may be detachably mounted to the apparatus main body 100, so that the cleaning assembly 200 may be easily maintained or replaced after being damaged when the cleaning assembly 200 is detachably mounted to the apparatus main body 100. Referring to fig. 1, as an embodiment of the inspection apparatus for post-installation strain gauge mounting quality detection according to the present invention, a cleaning assembly 200 includes a mounting base 210 fixedly mounted on a telescope module 410, a mounting head 220 detachably mounted on the mounting base 210, and a brush 230 disposed on the mounting head 220.
In this embodiment, the mounting head 220 may be detachably mounted on the mounting base 210 by plugging, screwing, or other methods.
Referring to fig. 1, as an embodiment of the inspection apparatus for detecting the mounting quality of the mounted strain gauge according to the present invention, a brush 230 extends along the longitudinal direction of the apparatus body 100.
Thus, the whole checking device is like a pen and is convenient to carry.
The current inspection method is not comprehensive and systematic enough, and involves only appearance inspection, adhesion position inspection, and resistance inspection, and does not involve usability inspection of the mounted strain gauge 300. The embodiment of the invention also provides a method for detecting the installation quality of the mounted strain gauge, which is provided based on the device for detecting the installation quality of the mounted strain gauge. Referring to fig. 1 to 7, the method for detecting the mounting quality of the mounted strain gauge includes the following steps:
cleaning foreign matters;
the mounting position and appearance of the strain gauge 300 are inspected by the visual inspection module 400;
measuring and checking resistance;
checking the dynamic availability;
wherein the dynamic availability checking step comprises the steps of:
connecting the strain gauge 300 to a data acquisition device, and recording a strain value of the strain gauge 300 when the strain gauge is not deformed;
applying a downward pressure to the strain gauge 300 through the pressing module 500, and checking whether the strain value of the strain gauge 300 is correct in response;
the down force is removed and it is checked whether the strain value of the strain gauge 300 returns to the detection result when no strain is generated.
The embodiment of the invention also provides a method for detecting the mounting quality of the mounted strain gauge, and the device for detecting the mounting quality of the mounted strain gauge has basically the same technical effects. Meanwhile, the method for detecting the mounting quality of the mounted strain gauge can comprehensively and systematically detect the mounting quality of the strain gauge and the working state of the mounted strain gauge.
Further, the above-mentioned inspection method does not involve the inspection of the accuracy of the measurement result of the mounted strain gauge 300, and in order to overcome this problem, as a specific embodiment of the inspection method for the mounting quality detection of the mounted strain gauge provided by the present invention, a quasi-static accuracy inspection step is further included between the resistance measurement and inspection step and the dynamic usability inspection step;
the quasi-static accuracy checking step comprises the following steps:
attaching the strain gauge 300 to a data acquisition device;
a standard resistor is connected in parallel with the strain gauge 300, and the strain value epsilon of the strain gauge 300 and the standard resistor after being connected in parallel is obtainedm；
According to
And
strain change calculation value epsilon after parallel standard resistance is obtained through calculationind(ii) a Wherein R ismIs the resistance value, R, of the strain gauge 300shuntIs the resistance value of a standard resistor, R1The resistance value of the strain gauge 300 and the standard resistor after being connected in parallel, and S is a known strain gauge coefficient;
comparison of εmAnd εindAnd judging whether the difference value of the two is within a preset range, if so, determining that the strain gauge 300 is qualified, and if not, determining that the strain gauge 300 is unqualified.
Further, the step of checking whether the strain value of the strain gauge 300 responds correctly includes the following steps:
reading the pressure value of the down force acting on strain gauge 300 by the alignment of force indicating mark 530 and pressure scale line 540;
estimating a strain change value of the strain gauge 300 according to the pressure value;
acquiring a strain change value acquired by a data acquisition device when the strain gauge 300 is subjected to a downward pressure;
comparing the estimated strain change value with the measured strain change value, whether the mounted strain gauge 300 is reliable or not is analyzed.
For the sake of understanding, the method for checking the mounting quality of the mounted strain gauge provided by the invention is described in a preferred embodiment.
(1) Foreign matter cleaning, after the strain gauge 300 is mounted, the cleaning module of the inspection apparatus cleans foreign matter on the surface of the strain gauge 300 and around the surface.
(2) And a mounting position check for checking whether the strain gauge is mounted at a design position, ensuring that the acquired data position is consistent with the target position, and if the mounting position deviates from the design position, removing the strain gauge and remounting the strain gauge. Through the lens group in the telescope module 410, the centering line 420 on the telescope module 410 and the strain gauge 300 are centered with the center mark 310, and the alignment condition of the hand drawing mark line 600 on the sample piece and the centering line 420 on the telescope module 410 is observed to check whether the pasting position of the strain gauge 300 is correct or not.
(3) And (4) appearance inspection, namely, magnifying the telescope module 410 to inspect whether the appearance of the strain gauge 300 is intact. If the appearance is damaged, the strain gauge needs to be cleaned and reinstalled. Locations where lighting conditions are not ideal may be inspected by the auxiliary telescope module 410 via the lighting module 430.
(4) Resistance measurement and inspection, namely measuring the resistance of the strain gauge 300 through a universal meter, comparing the resistance with a standard resistance value (provided by factory) of the strain gauge 300, if the resistance is within an error range, determining that the resistance of the strain gauge 300 is qualified, and recording the resistance data of the strain gauge 300; if the resistance is too large or too small, which may indicate damage to the strain gauge 300 itself or during the attachment process, the strain gauge 300 may need to be cleaned and reinstalled.
(5) Quasi-static accuracy check, the purpose of which is to check the measurement accuracy of strain gauges in static conditions. The strain gauge 300(120 Ω) is connected to a data acquisition device (for checking the strain value of the strain gauge 300) to detect the strain gauge 300The measuring strain gauge 300 is connected with a standard resistor (59880 omega) in parallel, and strain values epsilon before and after the standard resistor is connected with the standard resistor in parallel are recordedm(data acquisition system display values). The calculated value epsilon of the strain change after the standard resistance is connected in parallel is obtained through the following principle calculationind(-1000. mu. epsilon.). Comparison of εmAnd εindIf the phase difference is within the acceptable range, the quasi-static accuracy check is completed; if the value ε is calculatedindAnd a measured value epsilonmDeviations beyond the acceptable range require cleaning of the strain gauge and reinstallation.
The calculation principle is as follows:
wherein R ismFor measuring strain gauge resistance, RshuntIs a standard resistance, RGFor bridge resistance in the equipment, parallel connection RmAnd RshuntAfter, RmAnd RshuntThe parallel resistance is R1The purpose is to cause resistance change at the measuring end, consistent with the working principle of strain gauges. S is a strain gauge coefficient; epsilonindIs the strain change after parallel connection. R is as defined aboveshuntIs standard resistance, known; rmIn order to measure the resistance, it has already been measured in the resistance measurement and inspection step; and S is a known strain gauge coefficient, a factory self-contained coefficient and a known value. So that ε is calculated according to equation (2)indCalculated as the change in strain after parallel connection. If S is equal to 2, the wire resistance is ignored, and epsilon is obtained by calculationind＝-1000με。
(6) And dynamic usability check, which aims to check whether the strain gauge is in a usable working state before and after deformation by pressing the strain gauge. By pressing the module 500, a dynamic usability check is achieved, see fig. 5 and 6. The strain gauge 300 is electrically connected to the data acquisition device and is in a sensing state. And (3) locally applying deformation to the strain gauge and the measured sample, checking whether the response of the measured value of the strain gauge is correct, and after the deformation is removed, judging whether the measured value of the strain gauge returns to a state without deformation. By measuring the strain data in real time, the sticking state can be checked, if the sticking state is firm, if the sticking state is debonded after certain deformation, and the like. The specific operation is as follows:
the pen-holding position is used such that the indenter 510 is facing the strain gage 300, as shown in FIG. 5, when the force indicating mark 530 on the indenter 510 is aligned with the pressure scale 540 located at the lowermost portion of the transparent body 110. Then, by pressing the device body 100 downward, the elastic member 520 generates a downward pressure on the indenter 510, and then the indenter 510 applies a downward pressure to the strain gauge 300. The elastic member 520 is in a linear elastic phase, and the downforce is proportional to the compression displacement according to huke's law, so that the value of the downforce can be read by aligning the force indicating mark 530 with the pressure scale 540, as shown in fig. 6. Since the pressure value of the down pressure can be read, by comparing the strain change value (which can be obtained by an empirical method) estimated by the pressure value with the reading of the strain gauge 300 in the acquisition device during pressing, the strain gauge 300 which is installed can be dynamically checked in a nondestructive pressing mode to determine whether the measurement is reliable.
It should be noted that changing the order of examination items may achieve the same goal, but may increase the examination workload.
By the method for detecting the mounting quality of the mounted strain gauge, provided by the embodiment of the invention, the device is matched with the inspection device, so that the mounting quality of the strain gauge can be comprehensively inspected from appearance to function and from static to dynamic, and the phenomenon of inaccurate test result caused by the fact that the mounting quality of the strain gauge is not relevant can be avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An inspection apparatus for post-installation strain gauge installation quality detection, comprising:
a device main body; the device main body comprises a transparent tube body and a partition plate; two ends of the transparent tube body are open; the baffle is arranged in the transparent tube body and divides the inner cavity of the transparent tube body into a first cavity and a second cavity;
the cleaning assembly is arranged on the device main body and used for cleaning foreign matters on the strain gauge;
the visual inspection module comprises a telescope module arranged on the device main body, and a centering line used for detecting whether the mounting position of the strain gauge is correct or not is arranged on an eyepiece of the telescope module; and
the pressing module is arranged in the first cavity and comprises an elastic piece, a pressure head and a pressure value display structure; the elastic piece is arranged in the first cavity in a telescopic manner along the depth direction of the first cavity, and one end of the elastic piece is fixedly connected with the partition plate; the pressure head is connected with the other end of the elastic piece, one end of the pressure head, which is far away from the elastic piece, extends out of the first cavity, and the pressure head is used for applying downward pressure to the strain gauge when the strain gauge is subjected to dynamic usability inspection; the pressure value display structure is used for displaying the magnitude of the downward pressure and comprises a force indication mark and pressure scale marks, and the force indication mark is positioned on the peripheral wall of one end, connected with the elastic piece, of the pressure head; the pressure scale marks are positioned on the pipe wall of one end, close to the pressure head, of the transparent pipe body.
2. The inspection apparatus for post-installation strain gauge installation quality detection as set forth in claim 1, wherein the visual inspection module further comprises:
an illumination module disposed on the device body;
the lighting module includes:
the annular light source is arranged at one end, close to the objective lens, of the telescope module and is arranged around the objective lens;
a power supply assembly disposed within the device body; and
a switch provided on the apparatus main body;
wherein the power supply assembly is electrically connected with the annular light source through the switch.
3. The inspection apparatus for post-installation strain gauge mounting quality detection as claimed in claim 2, wherein the telescope module is detachably provided on the open end of the second chamber, and the annular light source is provided on the objective lens end of the telescope module;
the power supply assembly includes:
a battery disposed within the second cavity; and
and the electric connection assembly is arranged on the telescope module and used for electrically connecting the battery and the annular light source.
4. An inspection device for post-installation strain gauge installation quality detection as claimed in any one of claims 1 to 3, wherein the cleaning assembly comprises:
the mounting base is fixedly mounted on the telescope module;
the mounting head is detachably mounted on the mounting seat; and
and the hairbrush is arranged on the mounting head.
5. The inspection device for post-installation strain gauge installation quality detection as set forth in claim 4, wherein the brush extends in a longitudinal direction of the device body.
6. An inspection method for post-installation strain gauge installation quality detection, based on the inspection apparatus for post-installation strain gauge installation quality detection of any one of claims 1 to 3, characterized by comprising the steps of:
cleaning foreign matters;
the mounting position and the appearance of the strain gauge are inspected through the visual inspection module;
measuring and checking resistance;
checking the dynamic availability;
wherein the dynamic availability checking step comprises the steps of:
connecting the strain gauge to a data acquisition device, and recording a strain value of the strain gauge when the strain gauge is not deformed;
applying down pressure to the strain gauge through the pressing module, and checking whether the strain value of the strain gauge responds correctly;
and removing the downward pressure, and checking whether the strain value of the strain gauge returns to the detection result when no deformation exists.
7. The inspection method for post-installation strain gauge installation quality detection as claimed in claim 6, further comprising a quasi-static accuracy inspection step between the resistance measurement and inspection step and the dynamic usability inspection step;
the quasi-static accuracy checking step comprises the following steps:
connecting a strain gauge to a data acquisition device;
connecting a standard resistor in parallel on the strain gauge to obtain the strain value epsilon of the strain gauge and the standard resistor after being connected in parallelm；
According to
And
strain change calculation value epsilon after parallel standard resistance is obtained through calculationind(ii) a Wherein R ismIs the resistance value of the strain gauge, RshuntIs the resistance value of a standard resistor, R1The resistance value of the strain gauge and the standard resistor after being connected in parallel is shown, and S is the coefficient of the strain gauge;
comparison of εmAnd εindAnd judging whether the difference value of the two is within a preset range, if so, determining that the strain gauge is qualified, and if not, determining that the strain gauge is unqualified.
8. The inspection method for post-installation strain gauge installation quality detection as claimed in claim 6 or 7, wherein the step of checking whether the strain value of the strain gauge is responsive to a correct response comprises the steps of:
reading the pressure value of the downward pressure acting on the strain gauge according to the alignment condition of the force indication mark and the pressure scale mark;
estimating the strain change value of the strain gauge according to the pressure value;
acquiring a strain change value measured by the data acquisition device when the strain gauge is subjected to a downward pressure;
and comparing the estimated strain change value with the measured strain change value, and analyzing to determine whether the mounted strain gauge is reliable in measurement.
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| CN114046722B (en) * | 2021-10-12 | 2023-06-23 | 中车唐山机车车辆有限公司 | Displacement meter |
| CN117591837B (en) * | 2024-01-19 | 2024-04-02 | 中国航发四川燃气涡轮研究院 | Method for diagnosing feasibility of mounting scheme of strain gauge of rotor blade of gas compressor |
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