KR20170108187A - Displacement Measure Apparatus for Fixing part of Fastener and Displacement Measure Method for Fixing part of Fastener Thereby - Google Patents

Displacement Measure Apparatus for Fixing part of Fastener and Displacement Measure Method for Fixing part of Fastener Thereby Download PDF

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Publication number
KR20170108187A
KR20170108187A KR1020160031292A KR20160031292A KR20170108187A KR 20170108187 A KR20170108187 A KR 20170108187A KR 1020160031292 A KR1020160031292 A KR 1020160031292A KR 20160031292 A KR20160031292 A KR 20160031292A KR 20170108187 A KR20170108187 A KR 20170108187A
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South Korea
Prior art keywords
fastener
displacement amount
load
measuring
laser
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KR1020160031292A
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Korean (ko)
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KR101843041B1 (en
Inventor
이명건
김재훈
오광근
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충남대학교산학협력단
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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
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
    • G01B2003/1069—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N2021/1765—Method using an image detector and processing of image signal
    • G01N2021/177—Detector of the video camera type

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The present invention relates to an apparatus and method for measuring a displacement amount of a coupling portion of a fastener, which is configured to connect a fastener coupled to a test plate to an elevating device, precisely measure a vertical movement displacement amount of the fastener by irradiating a laser to the fastener from a laser displacement sensor arranged below the test plate while pulling the fastener upward with the elevating device, thereby precisely calculating the fastening weight, initial fracture, and final fracture position of the fastener for fastening a composite material test piece, and to more precisely demonstrate structural stability of a structure by applying a test result value to a structural analysis, and prevent a structural risk of the structure.

Description

TECHNICAL FIELD [0001] The present invention relates to a fastener displacement amount measuring apparatus and a fastener displacement amount measuring method using the fastener displacement amount measuring apparatus.

The present invention relates to an apparatus for measuring the amount of displacement of a fastener and a method for measuring displacement of a fastener of a fastener using the same.

In general, a fastener is a fastener such as a nail, a bolt, or a screw, which is used for fastening and fixing two or more members.

ASTM D 7332 / D 7332M test, one of the stiffness evaluation tests for the fastened parts, is a standard test method for measuring the load and displacement of a laminate by applying a vertical load to a fastener fastened to a composite laminate.

ASTM D 7332 / D 7332M test method requires measurement of load and displacement values to be imposed. The load measured in the existing test method is recorded on the load cell of the material testing machine, and the displacement is the displacement of the material testing machine crosshead.

The displacement value of the crosshead of the material testing machine is much different from the moving distance of the fastener fastened to the composite laminate as the movement distance of the actuator, and it is difficult to secure reliability of the test result.

Therefore, there is a limit in measuring the initial failure load in the direction perpendicular to the plane direction of the laminated plate fastened with the fastener.

Korean Utility Model Registration No. 20-0180502 (Announced on May 1, 2000)

The present invention provides a fastener displacement amount measuring apparatus for fasteners which can accurately confirm the amount of displacement of a fastener-fastened portion through a laser displacement sensor, and a fastener displacement amount measuring method using the fastener.

The apparatus for measuring the fastening displacement of a fastener according to an embodiment of the present invention includes a plate support member having a fastener connecting hole formed therein in which a test plate fastened with a fastener can be brought into close contact with a lower surface and exposing the fastener to an upper side, And a laser displacement sensor for measuring the amount of vertical movement of the fastener by irradiating a laser toward the fastener and spaced apart from the lower side of the plate supporting member, And a control unit.

The fastener displacement measuring device according to an embodiment of the present invention includes a base body member arranged to be spaced apart from a lower side of the plate supporting member and equipped with the laser displacement sensor, And a support block member which is installed to be spaced apart from both sides of the hole and on which the plate supporting member is fixed.

According to an embodiment of the present invention, an apparatus for measuring a fastening displacement of a fastener may further include a spring member installed on an upper surface of the base body member and supporting a lower surface of the test plate.

In the present invention, the elevating device may include a load cell capable of measuring a load for lifting the fastener.

According to an embodiment of the present invention, there is provided an apparatus for measuring a fastener displacement amount of a fastener, comprising: a display for outputting a vertical movement displacement of the fastener measured by the laser displacement sensor; And a control unit for controlling the operation of the laser displacement sensor and outputting the vertical movement displacement measured by the laser displacement sensor to the display unit.

In the present invention, the elevating device includes a load cell capable of measuring a load for lifting the fastener, and the control unit is electrically connected to the load cell of the elevating device and the elevating device to control the operation of the elevating device The display unit may further display an operating load of the elevating device.

According to an embodiment of the present invention, there is provided an apparatus for measuring a fastener displacement amount of a fastener, the apparatus further comprising a camera that captures a breakage pattern of the fastener fastening unit and is connected to the control unit to transmit the photographed image, It is possible to identify the type of breakage of the fastener fastening part by using the image and display the breakage form together with the operating load of the lifting device and the vertical movement displacement amount of the fastener fastening part on the display part.

A method of measuring a fastening displacement of a fastener according to an embodiment of the present invention includes a test plate preparation step of preparing a test plate fastened with a fastener, a step of connecting a lifting device to a fastener of the test plate, And a laser displacement amount measuring step of measuring a vertical displacement amount of the fastener by irradiating the laser on the upper side with a laser displacement sensor disposed under the test plate during the elevating step.

In the present invention, the elevating step may include a step of confirming or measuring a load at the time of ascending and descending of the fastener, and the step of measuring the amount of laser displacement may include a step of displaying the load measured or ascertained in the ascending and descending step together with the displacement amount.

In the present invention, the display process may display the load applied to the fastener by the elevating device and the vertical movement displacement amount of the fastener fastening portion in a table or graph in real time.

According to the present invention, the display process can be divided and displayed according to the type of breakage of the fastener fastening part.

According to the embodiment of the present invention, the fastening load, initial fracture and final fracture position of the composite material test piece fastening fastener can be accurately calculated by accurately measuring the vertical movement displacement of the fastener with the laser displacement sensor.

Also, according to the embodiment of the present invention, the test result value according to the present invention can be applied to the structure analysis to more accurately demonstrate the structural stability of the structure and prevent the structural risk of the structure.

In addition, according to the embodiment of the present invention, it is possible to accurately perform the measurement test of the vertical movement displacement of the fastener fastened to the test piece with a simple configuration, and to easily test and shorten the test time.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an embodiment of an apparatus for measuring a fastening displacement of a fastener according to the present invention. Fig.
2 is a view showing an example of use of an apparatus for measuring the fastening displacement of a fastener according to the present invention.
3 is a detailed view showing an example of a change in position of a fastener in a fastener displacement measuring apparatus of a fastener according to the present invention.
4 is a process diagram of a fastener displacement amount measurement method according to the present invention.
The present invention relates to a method for measuring a displacement amount of a fastener of a fastener, and more particularly,
6 is a table showing test results of a method for measuring displacement amount of a fastener of a fastener according to the present invention.
FIG. 7 is a graph showing test results of the displacement amount measurement method of the fastening portion of the fastener according to the present invention shown in FIG. 6;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like parts are designated with like reference numerals throughout the specification.

FIG. 1 is a sectional view showing an embodiment of an apparatus for measuring a fastening displacement of a fastener according to the present invention, and FIG. 2 is a view showing an example of using an apparatus for measuring a fastening displacement of a fastener according to the present invention.

1 and 2, the configuration and operation of an embodiment of an apparatus for measuring the fastening displacement of a fastener according to the present invention will be described.

The apparatus for measuring the fastening displacement of a fastener according to the present invention is characterized in that the test plate 1 fastened with the fastener 2 can be brought into close contact with the lower surface and the fastener connecting hole 11 for exposing the fastener 2 to the upper side And a support member (10).

The fastener connecting hole 11 is formed in the central portion of the plate supporting member 10 and is fastened to the fastener 2 through the fastener fitting 21 provided at the end of the lifting gear 20, ). ≪ / RTI >

The fastener displacement measuring device of the fastener according to the present invention includes a base body member 40 which is disposed on the lower side of the plate supporting member 10 and on which a laser displacement sensor 30 is installed.

A laser displacement sensor 30 is provided at the center of the base body member 40 and the laser displacement sensor 30 is embedded in the sensor mounting groove 41 formed on the upper surface side of the base body member 40 As shown in FIG.

 The laser displacement sensor 30 irradiates the laser toward the fastener 2 to measure the amount of vertical displacement of the fastener 2.

A support block member 50 is provided on the upper surface of the base body member 40 and spaced apart from the fastener connecting hole 11 on both sides.

The lower surface of the support block member 50 is seated on the upper surface of the base body member 40 and is fixed to the lower surface of the base body member 40 and the lower surface of the plate supporting member 10 is seated on the upper surface thereof.

The support block member 50 is fixed to the base body member 40 and the plate support member 10 by bolts to fix the position of the plate support member 10, respectively. That is, the position of the plate supporting member 10 spaced apart from the base body member 40 is fixed.

The fastener displacement measuring apparatus according to the present invention may further include a spring member 60 installed on the upper surface of the base body member 40 and supporting the lower surface of the test plate 1. [

The spring member 60 elastically supports the lower surface of the test plate 1 and keeps the test plate 1 in a state of being in tight contact with the lower surface of the plate supporting member 10, So that it can be easily carried out.

The lifting device 20 has a fastener connector 21 connected to the fastener 2 through a fastener connecting hole 11.

The elevating device 20 is a hydraulic cylinder 20a having a piston rod 20b that is operated to be lifted and lowered by hydraulic pressure. It is also disclosed that the elevating device 20 can be variously operated by other known actuators performing an elevating operation .

The lifting device 20 is provided with a load cell capable of measuring the force for lifting the fastener 2, that is, the load for pulling the fastener 2, so that the fastener 2 is damaged or the load upon breakage of the test plate 1 So that it can be confirmed.

The fastener 2 is an example of the test bolt 2a in which the head of the test bolt 2a is arranged on the lower surface of the test plate 1 and the end of the test bolt 2a is fixed to the upper And is fastened to the fastener connecting hole 21 through the test nut 2b.

The test plate 1 is provided with a fastening hole 1a for fastening the fastener 2 and the fastener 2 or the test bolt 2a is fastened to the upper side of the test plate 1 through the fastening hole 1a And is fastened to the fastener connecting hole 21 through the test nut 2b as an example.

The fastener connection port 21 includes a bottom portion 21a having a bolt hole through which the end portion of the test bolt 2a passes and two side portions 21b projecting from both sides of the bottom portion 21a. And a connecting bracket member which is disposed on both sides of the piston rod 20b and fastened and fixed to the piston rod 20b by bolts and nuts. In addition, the elevating device 20 and the fastener 2 are connected to each other, It is to be understood that the present invention can be modified and implemented in any configuration that allows the fastener 2 to be pulled by the device 20. [

The apparatus for measuring the fastening displacement of a fastener according to the present invention includes a display unit 70 for outputting a vertical movement displacement of a fastener 2 measured by a laser displacement sensor 30, a laser displacement sensor 30, a display unit 70, And a control unit 80 for controlling the operation of the laser displacement sensor 30 and outputting the vertical movement displacement measured by the laser displacement sensor 30 to the display unit 70. [

The control unit 80 is electrically connected to the load cell provided to the elevating machine 20 and the elevating machine 20 to control the operation of the elevating machine 20 and displays the operating load of the elevating machine 20 to the display unit 70 .

As an example, the display unit 70 may be a monitor for outputting to the screen. In addition, any output device capable of displaying the vertical movement displacement amount of the fastener 2 and the operation load of the elevation device 20 in a table or a graph can be used .

3 is a detailed view showing an example of a change in the position of the fastener 2 in the fastener displacement measuring apparatus of the fastener according to the present invention. Referring to FIG. 3, the laser displacement sensor 30 includes a fastener 2, And laser is irradiated to the lower end of the fastener 2, that is, the head of the fastener 2, and the vertical movement displacement L of the fastener 2 is measured.

That is, in the fastener displacement measuring apparatus of the fastener according to the present invention, the fastener 2 fastened to the test plate 1 is pulled upward by the lifting device 20, and the laser displacement The sensor 30 can measure the vertical movement displacement L of the fastener 2 accurately by irradiating the fastener 2 with a laser.

The apparatus for measuring the amount of displacement of the fastener of the present invention further includes a camera (not shown) capable of photographing the type of breakage of the fastener fastening part. The camera is electrically connected to the controller 80, .

The control unit 80 checks the type of breakage of the fastener fastening part by the image photographed by the camera, identifies the type of breakage that has been confirmed, displays the operation load of the elevator device 20 together with the vertical movement displacement amount of the fastener fastening part can do.

4 is a process diagram of a fastener displacement measuring method of a fastener according to the present invention. Referring to FIG. 4, the fastener displacement amount of the fastener 2, that is, the amount of displacement of the fastener 2, A method of measuring the vertical movement displacement of the wafer will be described in more detail.

The fastener displacement amount measurement method of the fastener according to an embodiment of the present invention includes a test plate preparation step S100 for preparing the test plate 1 fastened with the fastener 2, The laser displacement sensor 30 disposed below the test plate 1 during the ascending and descending step S200 connects the lifting device 20 and the fastener 2 to the upper side And a laser displacement amount measuring step (S300) of measuring the vertical movement displacement amount of the fastener 2 by irradiating the fastener 2 with a laser beam.

That is, in the test plate preparation step (S100), the fastener (2), that is, the bolt (2a) is fastened to the fastening hole (1a) of the test plate (1) so that the head of the test bolt And is disposed on the lower surface of the plate supporting member 10 so as to face the lower surface.

The test plate 1 is disposed in close contact with the lower surface of the plate supporting member 10 by the spring member 60 and the lifting device 20 is connected to the fastener 2 by the fastener fitting hole 21.

 The fastener connecting hole 21 is fixed to the test bolt 2a by fastening the test nut 2b to the end of the test bolt 2a to which the end portion of the test bolt 2a is coupled through the bolt hole.

 In the ascending and descending step S200, the piston rod 20b to which the fastener connecting hole 21 is fixed is raised and lowered to pull up the fastener 2, that is, the test bolt 2a fixed to the fastener connecting hole 21. [

The laser displacement amount measuring step S300 measures the displacement of the fastener 2 in the vertical moving direction by the elevation of the test plate 1, that is, the deformation of the periphery of the fastening hole 1a of the test plate 1, The displacement of the fastener 2 in the vertical moving direction can be accurately confirmed by irradiating the fastener 2 toward the lower surface of the fastener 2 which vertically moves.

The step of ascending and descending S200 includes a step of confirming or measuring the load during the ascending and descending of the fastener 2 and a step of measuring the amount of laser displacement S300 of displaying the ascertained or measured load in the ascending and descending step S200, .

FIG. 5 is a view illustrating an example of how the fastener fastening portion is broken in the fastener displacement measuring method according to the present invention. Referring to FIG. 5, the fastening fastening portion is divided into eight types, It is preferable to display the breakage form together with the form.

5 (a) to 5 (h) show eight types of breakage of the fastener fastening portion.

5A shows a breakage of the fastening hole 1a fastened by the fastener, that is, a state in which the periphery of the fastening hole 1a of the test plate 1 is broken, and is indicated by PLT.

FIGS. 5 (b) and 5 (c) show breakage patterns in which the head of the fastener is separated and are represented by FFS.

Fig. 5 (d) shows the breakage mode in which the head of the fastener is bent and deformed, and is indicated by FHD.

FIG. 5 (e) shows the breakage mode in which the fastener is broken and is indicated by FBH.

FIG. 5 (f) shows a fracture form in which the thread of the fastener is broken and the nut is separated and is indicated by FTS.

FIG. 5 (g) shows a form in which the head portion of the fastener is partially cut off, and is represented by FFS.

5 (h) shows a form in which the nut fastened to the fastener is cut and broken, and is denoted by FCF.

FIG. 6 is a table showing test results of a fastener displacement amount measurement method of a fastener according to the present invention, and FIG. 7 is a graph of test results of a fastener displacement amount measurement method of a fastener according to the present invention of FIG. 6, The load applied to the fastener by the lifting device 20 and the vertical movement displacement amount of the fastener fastening portion are displayed in a table or a graph in real time.

In addition, it is possible to identify the type of breakage when the fastener fastening portion is broken and to display the load when the fastener fastening portion is broken.

According to the embodiment of the present invention, the fastening load, initial fracture and final fracture position of the composite material specimen fastener fastener can be accurately calculated by accurately measuring the vertical movement displacement of the fastener with the laser displacement sensor 30. [

Also, according to the embodiment of the present invention, the test result value according to the present invention can be applied to the structure analysis to more accurately demonstrate the structural stability of the structure and prevent the structural risk of the structure.

Further, according to the embodiment of the present invention, it is possible to accurately perform the measurement test for the vertical movement displacement of the fastener fastened to the test piece with a simple configuration, and to easily test and shorten the test time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

1: test plate 1a: fastening hole
2: fastener 2a: test bolt
2b: test nut 10: plate support member
11: fastener connecting hole 20: lifting device
20a: Hydraulic cylinder 20b: Piston rod
21: fastener connecting hole 21a:
21b: side portion 30: laser displacement sensor
40: base body member 41: sensor mounting groove
50: support block member 60: spring member
70: Display unit 80:
S100: Test plate preparation step S200:
S300: Measurement step of laser displacement amount

Claims (11)

A plate supporting member having a fastener connecting hole formed in the upper surface of the test plate,
A lifting and lowering device having a fastener connector connected to the fastener through the fastener connecting hole,
A laser displacement sensor arranged to be spaced apart from the lower side of the plate support member and measuring a vertical movement displacement amount of the fastener by irradiating a laser toward the fastener,
And the fastener displacement amount measuring device. The method of claim 1,
A base body member spaced from the lower side of the plate support member and provided with the laser displacement sensor,
A support block member installed on an upper surface of the base body member to be spaced apart from both sides of the fastener connecting hole,
The fastener displacement amount measuring device further comprising: 3. The method of claim 2,
A spring member mounted on an upper surface of the base body member for supporting a lower surface of the test plate,
The fastener displacement amount measuring device further comprising: The method of claim 1,
Wherein the elevating device includes a load cell capable of measuring a load for lifting and lowering the fastener. The method of claim 1,
A display for outputting a vertical movement displacement of the fastener measured by the laser displacement sensor, and
A controller for controlling the operation of the laser displacement sensor and electrically connected to the laser displacement sensor and the display unit to output a vertical movement displacement measured by the laser displacement sensor to the display unit,
The fastener displacement amount measuring device further comprising: The method of claim 5,
Wherein the elevating device includes a load cell capable of measuring a load for lifting and lowering the fastener,
Wherein the control unit is electrically connected to the load cell of the elevating device and the elevating device to control the operation of the elevating device and further display the operating load of the elevating device to the display unit. The method of claim 6,
And a camera connected to the control unit and capable of transmitting the photographed image,
The control unit checks the type of breakage of the fastener fastening part by the image photographed by the camera, identifies the type of breakage that has been confirmed, and displays the operation load of the lifting device on the display unit and the breakage form together with the vertical movement displacement amount of the fastener fastening part A fastener displacement amount measuring device. A test plate preparing step of preparing a test plate fastened with a fastener;
An elevating step of connecting an elevating device to a fastener of the test plate and pulling up the fastener; And
And a laser displacement amount measuring step of measuring a vertical displacement amount of the fastener by irradiating the laser to the upper fastener in the laser displacement sensor disposed under the test plate during the elevating step. 9. The method of claim 8,
The elevating step ascertains or measures a load at the time of ascending and descending of the fastener,
Wherein the laser displacement amount measurement step includes a display step of displaying a load, which is confirmed or measured in the ascending and descending step, together with the displacement amount. The method of claim 9,
Wherein the display step displays the load applied to the fastener by the lifting device and the vertical movement displacement amount of the fastener fastening part in real time in a table or a graph. 11. The method of claim 10,
The method of claim 1, wherein the step of disposing the fastener comprises the following steps:
KR1020160031292A 2016-03-16 2016-03-16 Displacement Measure Apparatus for Fixing part of Fastener KR101843041B1 (en)

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Publication number Priority date Publication date Assignee Title
KR20200077696A (en) * 2018-12-20 2020-07-01 재단법인 한국기계전기전자시험연구원 A testing apparatus for a repeated load

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KR102507102B1 (en) * 2021-01-28 2023-03-07 한국항공우주산업 주식회사 Proof loda test device

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WO1999009327A1 (en) * 1997-08-19 1999-02-25 Ceney, Patricia, Anne Load indicating fastener systems method and apparatus
GB201300093D0 (en) 2013-01-04 2013-02-20 Phipps Maria J Load indicating nut/washer

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Publication number Priority date Publication date Assignee Title
KR20200077696A (en) * 2018-12-20 2020-07-01 재단법인 한국기계전기전자시험연구원 A testing apparatus for a repeated load

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