CN104931175A - Method for measuring bolt axial fastening force through bolt axial strain - Google Patents
Method for measuring bolt axial fastening force through bolt axial strain Download PDFInfo
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- CN104931175A CN104931175A CN201410268720.6A CN201410268720A CN104931175A CN 104931175 A CN104931175 A CN 104931175A CN 201410268720 A CN201410268720 A CN 201410268720A CN 104931175 A CN104931175 A CN 104931175A
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- bolt
- strain
- bolt shaft
- strainometer
- fastening force
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000012360 testing method Methods 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000000741 silica gel Substances 0.000 claims description 18
- 229910002027 silica gel Inorganic materials 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 15
- 238000011900 installation process Methods 0.000 claims description 10
- 229920000297 Rayon Polymers 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention discloses a method for measuring bolt axial fastening force through bolt axial strain. The method comprises the following steps that firstly a strain gauge is installed on a bolt along an axial direction and is connected to a strain instrument, then the bolt is placed on a test machine and is loaded, after a load is added the axial strain data of the bolt is collected through the strain instrument, the liner equation y=36.258x-27.7 of strain degree and loaded axial fastening force is obtained according to the strain data and the load data, y is the strain degree, the unit of the strain degree is micron meter, x is the loaded axial fastening force, and the unit of the axial fastening force is KN. The error of the detected axial fastening force is small, and the method has the advantages of simple detection and wide application range.
Description
Technical field:
The present invention relates to bolt shaft to fastening force technical field of measurement and test, more specifically to a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force.
Background technology:
In bridge and skyscraper, the connection of steel construction mostly adopts fastening bolt mode.Usual each connecting portion has tens of so that hundreds of fastening bolts, and the axial grip size of these fastening bolts and even situation, have influence on quality and the usability of steel structure connection extremely significantly.The axial grip detection method of existing fastening bolt mainly contains two kinds.First method is that dial torque wrench method adopts special wrench set when tighting a bolt, and this spanner can directly indicate the moment of torsion applied when tightening, and judges whether fastening bolt axis grip reaches requirement numerical value according to the size of applied moment of torsion.The shortcoming of this method be to the relevant geometry of bolt itself and material parameter dependence comparatively large, such as when bolt thread surface roughness departs from nominal value, the axial grip corresponding to same moment of torsion is come in and gone out very large.If for detecting after work, being then unscrewed by oneself fastening bolt through tightening, unscrewing executed torque according to by bolt, whether axial grip when judging original tight condition as required numerical value, and then tightens bolt to restore to the original state again.The shortcoming of this way is, due to the front mill once tightened and effect, when bolt second time tightens (reinstatements), institute applies the own change of relation of moment of torsion grip axial with it, then judges that whether up to standard its axial grip is unreliable according to executed torque.In addition, during detection, all bolts all can not be unscrewed one time, thus can only meet the needs of indivedual sampling observation.Second method is supersonic sounding.Ultrasonic probe is fitted in fastening bolt head or tail end face, judges that whether its axial grip is up to standard by size time delay of ultrasonic reflections echo.The shortcoming of this method is, must by bolt head or the laminating of tail end face grinding smooth so that ultrasonic probe, and this is more difficult in constructing at the scene accomplishes; Also great decision errors can be introduced in addition when fastening bolt length has small variations.
Summary of the invention:
Object of the present invention be just to provide a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, the bolt shaft that its detects is less to the error of fastening force, in addition it also have detect simple, the feature that the scope of application is wider.
For achieving the above object, of the present invention a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, described method comprises the steps: first on bolt, to install strainometer vertically, strainometer is connected with strainmeter, then bolt to be put on testing machine and bolt is loaded, add after load by strainmeter gather bolt shaft to strain data, the linear equation y=36.258x-27.7 of the power that axially fastens of degree of strain and loading is obtained according to strain data and added load data, wherein y is degree of strain, described degree of strain unit is μm, and x is the power that axially fastens loaded, the described unit of force that axially fastens is KN.
Preferred as technique scheme, described method also comprises the installation process of strainometer, described installation process is specially: first offer blind hole vertically in the center of bolt upper top, and on the inwall of blind hole, offer groove, then the silica gel of fusing is injected in blind hole and makes the silica gel melted enter into groove, treat that silica gel is micro-when solidifying strainometer is implanted in silica gel to make strainometer keep erectting, naturally cool afterwards and silica gel is solidified completely strainometer is fixed in blind hole.
Preferred as technique scheme, described method also comprises the installation process of strainometer, described installation process is specially: first arrange two planes symmetrically at the screw thread middle section position of bolt, then will polish process to two planes, in two planes, strainometer fixed by viscose glue respectively afterwards.
Preferred as technique scheme, strain transducer is counted in described strain.
Preferred as technique scheme, described bolt is 42CrMo high-strength bolt.
Preferred as technique scheme, described method also comprises the control to working bolt environment temperature, is specially the collection controlling to carry out bolt at 30 DEG C-60 DEG C strain data data in temperature.
Preferred as technique scheme, described method also comprises the control to working bolt humidity, and being specially at ambient humidity is that 0-85%RH carries out the collection of strain data data to bolt.
Preferred as technique scheme, blind hole is of a size of 1.6mm or 2mm.
Preferred as technique scheme, described method also comprises the process that strainometer is connected with strainmeter, the process of described connection is specially: be first electrically connected by the signal input line of strainometer and strainmeter, then contact point soldering is fixed, with signal shielding tinfoil, contact point is wrapped afterwards, then contact site to be imbedded in silica gel and to be fixed on the surface at bolt top.。
Beneficial effect of the present invention is: the bolt shaft of detection is less to the error of fastening force, and it also has detection simply in addition, the feature that the scope of application is wider.
Accompanying drawing illustrates:
Below in conjunction with accompanying drawing, the present invention is described further:
Fig. 1 is the linear graph of the power that axially fastens of degree of strain and loading in the embodiment of the present invention 1.
Fig. 2 is the scheme of installation of strainometer in the embodiment of the present invention 1
Fig. 3 is the scheme of installation of strainometer in the embodiment of the present invention 2.
In figure: 1,1a, bolt; 2,2a, strainometer
Embodiment:
The following stated is only the preferred embodiment embodying the principle of the invention, does not therefore limit protection scope of the present invention
Embodiment 1: a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, described method comprises the steps: first on bolt, to install strainometer vertically, strainometer is connected with strainmeter, then bolt to be put on testing machine and bolt is loaded, add after load by strainmeter gather bolt shaft to strain data, the Line Chart of the power that axially fastens of degree of strain and loading is obtained as shown in Figure 1 according to strain data and added load data, linear equation y=36.258x-27.7 is obtained according to projection, wherein y is degree of strain, described degree of strain unit is μm, and x is the power that axially fastens loaded, the described unit of force that axially fastens is KN.
Be illustrated in figure 2 the scheme of installation of strainometer, in the present embodiment, strainometer 2 is arranged on the center of bolt 1, installation process is specially: first offer blind hole vertically in the center of bolt upper top, and on the inwall of blind hole, offer groove, then the silica gel of fusing is injected in blind hole and makes the silica gel melted enter into groove, treat that silica gel is micro-when solidifying strainometer is implanted in silica gel to make strainometer keep erectting, naturally cool afterwards and silica gel is solidified completely strainometer is fixed in blind hole.
Strain transducer is counted in strain in the present embodiment.
In the present embodiment, bolt is 42CrMo high-strength bolt.
The present embodiment also comprises the control to working bolt environment temperature, is specially the collection controlling to carry out bolt at 30 DEG C-60 DEG C strain data data in temperature.
The present embodiment also comprises the control to working bolt humidity, and being specially at ambient humidity is that 0-85%RH carries out the collection of strain data data to bolt.
1.6mm or 2mm is of a size of specific to blind hole in the present embodiment.
In addition, the process that strainometer is connected with strainmeter is also comprised at the present embodiment, the process of described connection is specially: be first electrically connected by the signal input line of strainometer and strainmeter, then contact point soldering is fixed, with signal shielding tinfoil, contact point is wrapped afterwards, then contact site to be imbedded in silica gel and to be fixed on the surface at bolt top.
Embodiment 2: as shown in Figure 3, strainometer 2a is arranged on bolt 1a stud section, the installation process of strainometer 2a is specially: first arrange two planes symmetrically at the screw thread middle section position of bolt, and then will polish process to two planes, in two planes, strainometer fixed by viscose glue respectively afterwards.
The bolt shaft that the embodiment of the present invention detects is less to the error of fastening force, and it also has detection simply, conveniently in addition, the feature that the scope of application is wider.
Claims (9)
1. one kind by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, described method comprises the steps: first on bolt, to install strainometer vertically, strainometer is connected with strainmeter, then bolt to be put on testing machine and bolt is loaded, add after load by strainmeter gather bolt shaft to strain data, the linear equation y=36.258x-27.7 of the power that axially fastens of degree of strain and loading is obtained according to strain data and added load data, wherein y is degree of strain, described degree of strain unit is μm, and x is the power that axially fastens loaded, the described unit of force that axially fastens is KN.
2. according to claim 1 a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, described method also comprises the installation process of strainometer, described installation process is specially: first offer blind hole vertically in the center of bolt upper top, and on the inwall of blind hole, offer groove, then the silica gel of fusing is injected in blind hole and makes the silica gel melted enter into groove, treat that silica gel is micro-when solidifying strainometer implanted in silica gel to make strainometer keep erectting, naturally cooling makes silica gel solidify completely strainometer is fixed in blind hole afterwards.
3. according to claim 1 a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, described method also comprises the installation process of strainometer, described installation process is specially: first arrange two planes symmetrically at the screw thread middle section position of bolt, then will polish process to two planes, in two planes, strainometer fixed by viscose glue respectively afterwards.
4. according to any one of claim 1 to 3 a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, strain transducer is counted in described strain.
5. according to claim 4 a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, described bolt is 42CrMo high-strength bolt.
6. according to claim 4 a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, described method also comprises the control to working bolt environment temperature, is specially the collection controlling to carry out bolt at 30 DEG C-60 DEG C strain data data in temperature.
7. according to claim 4 a kind of by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, described method also comprises the control to working bolt humidity, and being specially at ambient humidity is that 0-85%RH carries out the collection of strain data data to bolt.
8. a kind of according to claim 1 or 3 is by bolt shaft to strain measurement bolt shaft to the method for fastening force, and it is characterized in that, blind hole is of a size of 1.6mm or 2mm.
9. a kind of according to Claims 2 or 3 by bolt shaft to strain measurement bolt shaft to the method for fastening force, it is characterized in that, described method also comprises the process that strainometer is connected with strainmeter, the process of described connection is specially: be first electrically connected by the signal input line of strainometer and strainmeter, then contact point soldering is fixed, with signal shielding tinfoil, contact point is wrapped afterwards, then contact site to be imbedded in silica gel and to be fixed on the surface at bolt top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410268720.6A CN104931175A (en) | 2014-06-17 | 2014-06-17 | Method for measuring bolt axial fastening force through bolt axial strain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410268720.6A CN104931175A (en) | 2014-06-17 | 2014-06-17 | Method for measuring bolt axial fastening force through bolt axial strain |
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| Publication Number | Publication Date |
|---|---|
| CN104931175A true CN104931175A (en) | 2015-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410268720.6A Pending CN104931175A (en) | 2014-06-17 | 2014-06-17 | Method for measuring bolt axial fastening force through bolt axial strain |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830964A (en) * | 2017-09-28 | 2018-03-23 | 保定市立中车轮制造有限公司 | Wheel bolt axially fastens torque test method |
| CN108572040A (en) * | 2018-04-23 | 2018-09-25 | 北京交通大学 | A detection method, detection system and detection device for axial force of bolts in service |
| WO2019232675A1 (en) * | 2018-06-04 | 2019-12-12 | 舍弗勒技术股份两合公司 | Screw bolt assembly for measuring preload and bearing preload measurement apparatus |
| CN110595655A (en) * | 2019-10-22 | 2019-12-20 | 广东高标电子科技有限公司 | Electric bicycle torque detection device and electric bicycle |
| CN112945435A (en) * | 2021-02-04 | 2021-06-11 | 包头盛泰汽车零部件制造有限公司 | Method for testing axial force of bolt for wheel |
| CN113700615A (en) * | 2020-05-21 | 2021-11-26 | 纳博特斯克有限公司 | Bolt-type sensor device, bolt body, windmill drive device, windmill, and fastening structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202468619U (en) * | 2011-12-26 | 2012-10-03 | 潍柴动力股份有限公司 | Axial force measuring bolt |
| CN103162900A (en) * | 2013-02-28 | 2013-06-19 | 国电联合动力技术有限公司 | A pre-embedded bolt axial force sensor calibration system and its application method |
| CN103592063A (en) * | 2013-11-14 | 2014-02-19 | 中冶建筑研究总院有限公司 | Method for testing pretension force of high-strength bolt in in-service state |
| CN103743375A (en) * | 2013-12-23 | 2014-04-23 | 石家庄铁道大学 | Rapid testing method for invert strain of existing tunnel |
-
2014
- 2014-06-17 CN CN201410268720.6A patent/CN104931175A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202468619U (en) * | 2011-12-26 | 2012-10-03 | 潍柴动力股份有限公司 | Axial force measuring bolt |
| CN103162900A (en) * | 2013-02-28 | 2013-06-19 | 国电联合动力技术有限公司 | A pre-embedded bolt axial force sensor calibration system and its application method |
| CN103592063A (en) * | 2013-11-14 | 2014-02-19 | 中冶建筑研究总院有限公司 | Method for testing pretension force of high-strength bolt in in-service state |
| CN103743375A (en) * | 2013-12-23 | 2014-04-23 | 石家庄铁道大学 | Rapid testing method for invert strain of existing tunnel |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830964A (en) * | 2017-09-28 | 2018-03-23 | 保定市立中车轮制造有限公司 | Wheel bolt axially fastens torque test method |
| CN107830964B (en) * | 2017-09-28 | 2020-03-31 | 保定市立中车轮制造有限公司 | Wheel bolt axial fastening torque test method |
| CN108572040A (en) * | 2018-04-23 | 2018-09-25 | 北京交通大学 | A detection method, detection system and detection device for axial force of bolts in service |
| WO2019232675A1 (en) * | 2018-06-04 | 2019-12-12 | 舍弗勒技术股份两合公司 | Screw bolt assembly for measuring preload and bearing preload measurement apparatus |
| CN110595655A (en) * | 2019-10-22 | 2019-12-20 | 广东高标电子科技有限公司 | Electric bicycle torque detection device and electric bicycle |
| CN113700615A (en) * | 2020-05-21 | 2021-11-26 | 纳博特斯克有限公司 | Bolt-type sensor device, bolt body, windmill drive device, windmill, and fastening structure |
| CN112945435A (en) * | 2021-02-04 | 2021-06-11 | 包头盛泰汽车零部件制造有限公司 | Method for testing axial force of bolt for wheel |
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Application publication date: 20150923 |