CN204988170U - Bolt normal strain measuring device - Google Patents
Bolt normal strain measuring device Download PDFInfo
- Publication number
- CN204988170U CN204988170U CN201520797654.1U CN201520797654U CN204988170U CN 204988170 U CN204988170 U CN 204988170U CN 201520797654 U CN201520797654 U CN 201520797654U CN 204988170 U CN204988170 U CN 204988170U
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- Prior art keywords
- bolt
- foil gauge
- strain measurement
- normal strain
- pad cylinder
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Abstract
The utility model provides a bolt normal strain measuring device, relates to structural test measuring device design technical field for the normal strain of accurate measurement bolt, foil gage are pasted on the bolt, and the bolt passes the testpieces and fills up a section of thick bamboo and through tighten nut, and the data through the leading -in measurement system that meets an emergency of foil gage can reach the normal strain of bolt. The top surface and the bottom surface of filling up a section of thick bamboo are provided with bolt hole and lower bolt hole respectively, fill up the through -hole of seting up the axle center in section of thick bamboo side. The utility model provides a bolt normal strain measuring device's bolt has set up the polished rod that is used for pasting the foil gage to it not influenced by external force to set up a pad section of thick bamboo guarantee foil gage between bolt and testpieces. Adopt the utility model provides an it is stable, swift, accurate that bolt normal strain measuring device measures bolt normal strain.
Description
Technical field
The utility model relates to structural test measurement mechanism design field, in particular to a kind of bolt normal strain measurement mechanism.
Background technology
The measurement of bolt axial strain in aircraft structure test process is bolt strained to analysis, structure partial loading conditions, structure nail carries distribution and optimizing structure design important in inhibiting, but owing to not having sufficient space to paste foil gauge between bolt and bolt hole in the middle of prior art, so the axial direction strain on bolt is difficult to directly measure, indirectly to measure or bolt normal strain that indirect calculation draws is inaccurate or theoretical property does not meet actual conditions too by force.Do not have in the middle of prior art and can directly measure bolt axial strain, be i.e. normal strain, test unit.Therefore, the technical matters needing now solution badly how to arrange a kind of bolt normal strain measurement mechanism, can directly, Measurement accuracy draws the normal strain of bolt.
Utility model content
The purpose of this utility model is to solve above-mentioned deficiency of the prior art, provides a kind of simple and reasonable, the bolt normal strain measurement mechanism that directly can measure the normal strain of bolt.
The purpose of this utility model is achieved through the following technical solutions: a kind of bolt normal strain measurement mechanism, is characterized in that, comprising: bolt, testpieces, foil gauge, pad cylinder, nut, wire and strain measurement system, wherein,
Bolt is the special bolt of machining, and the stage casing of the axis on screw rod is polished rod;
Foil gauge pastes the polished rod part on bolt;
Pad cylinder is the cylindrical structure of hollow, and end face and the bottom surface of pad cylinder are respectively arranged with upper bolt hole and lower bolt hole, and pad cylinder side opening was provided with the through hole in axle center;
Nut coordinates with bolt will pad cylinder and testpieces compresses;
Wire is for connecting foil gauge and strain measurement system;
Strain measurement system for the treatment of and show foil gauge import data.
Strain gauge adhesion is on bolt, and bolt passes testpieces with pad cylinder and by nut screwing clamping, can be drawn the normal strain of bolt by the data of foil gauge importing strain measurement system.
In such scheme preferably, wire is through the through hole of pad cylinder side, and wherein one end connects described foil gauge, and the other end connects described strain measurement system.Foil gauge is connected by wire with strain measurement system, realizes the transmission of data.
In above-mentioned either a program preferably, the diameter of upper bolt hole of cylinder and the equal diameters of the screw rod of bolt is padded.
In above-mentioned either a program preferably, the equal diameters of the lower bolt hole of the diameter of the polished rod section of bolt and 2 times of thickness sums of foil gauge and pad cylinder.Guarantee that the measurement result that the restriction that in installation process, foil gauge can not be subject to padding cylinder causes is inaccurate.
In above-mentioned either a program preferably, definition: the length of the polished rod part on the screw rod of bolt is L, foil gauge along described bolt shaft to length be a, wherein, L >=a.Bolt is applied to bolt in the process of power and can produce small deformation, adopt the reason of above-mentioned design to be the impact avoiding deformation to measure foil gauge.
The beneficial effect of bolt normal strain measurement mechanism provided by the utility model is, structure is simple, and easily manufactured, bolt is provided with the polished rod for pasting foil gauge, and between bolt and testpieces, arranges pad cylinder ensure that foil gauge does not affect by external force.It is stable, quick that bolt normal strain measured by the bolt normal strain measurement mechanism adopting the utility model to provide, accurately.
Accompanying drawing explanation
Fig. 1 is the structural representation of the preferred embodiment according to bolt normal strain measurement mechanism of the present utility model;
Fig. 2 is the structural representation of the pad cylinder embodiment illustrated in fig. 1 according to bolt normal strain measurement mechanism of the present utility model;
Fig. 3 is the sectional structure schematic diagram in the barrel structure A-A face of pad shown in Fig. 2.
Reference numeral:
1-bolt, 2-testpieces, 3-foil gauge, 4-pad cylinder, 5-nut, 6-wire.
Embodiment
In order to understand the bolt normal strain measurement mechanism according to the utility model scheme better, be further elaborated explanation below in conjunction with the preferred embodiment of accompanying drawing to bolt normal strain measurement mechanism of the present utility model.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the utility model part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore the restriction to the utility model protection domain can not be interpreted as.
As shown in Figure 1-Figure 3, the bolt normal strain measurement mechanism that the utility model provides, comprising: bolt 1, testpieces 2, foil gauge 3, pad cylinder 4, nut 5, wire 6 and strain measurement system, wherein, bolt 1 is the special bolt of machining, and the stage casing of the axis on screw rod is polished rod; Foil gauge 3 is pasted onto the polished rod part on bolt 1; Pad cylinder 4 is the cylindrical structure of hollow, and end face and the bottom surface of pad cylinder 4 are respectively arranged with upper bolt hole and lower bolt hole, and pad cylinder 4 side opening was provided with the through hole in axle center; Nut 5 coordinates with bolt 1 and pad cylinder 4 and testpieces 2 is compressed; Wire 6 is for connecting foil gauge 3 and strain measurement system; Strain measurement system is for showing the dependent variable of foil gauge 3.Foil gauge 3 is pasted onto on bolt 1, and bolt 1 is through testpieces 2 and pad cylinder 4 and tightened by nut 5, can be drawn the normal strain of bolt 1 by the measured value of foil gauge 3.
In the bolt normal strain measurement mechanism that the utility model provides, wire 6 is through the through hole of pad cylinder 4 side, and wherein one end connects foil gauge 3, and the other end connects described strain measurement system.The pad diameter of upper bolt hole of cylinder 4 and the equal diameters of the screw rod of bolt 1.The equal diameters of the lower bolt hole of the diameter of the polished rod section of bolt 1 and 2 times of thickness sums of described foil gauge 3 and described pad cylinder 4.
Define in the bolt normal strain measurement mechanism that the utility model provides: the length of the polished rod part on the screw rod of bolt 1 is L, foil gauge 3 is a along the length of bolt 1 axis, wherein, and L >=a, guarantee that foil gauge 3 can be fitted bolt 1, the impact of screw thread on bolt 1 can not be subject to.The foil gauge 3 of the bolt normal strain measurement mechanism that the utility model provides is pasted onto the polished rod part of above-mentioned bolt 1, and bolt 1 penetrates pad cylinder 4 from the lower bolt hole of pad cylinder 4.Owing to being subject to the impact of foil gauge 3, the length of the radial direction along bolt 1 of the polished rod part of bolt 1 can increase to some extent.The diameter of the upper bolt hole of pad cylinder 4 is equal with the screw diameter of bolt 1.Foil gauge 3 is pasted onto on bolt 1, and bolt 1 penetrates from the lower bolt hole of pad cylinder 4, passes from upper bolt hole.For these reasons, the design of the size of the lower bolt hole of pad cylinder 4 is larger than the diameter of the upper bolt hole of pad cylinder 4, goes out to be of a size of greatly the thickness of the foil gauge 3 of 2 times, ensures that padding cylinder 4 in the process of bolt insertion pad cylinder 4 can not produce extruding with foil gauge 3.Avoid that the diameter of lower bolt hole owing to padding cylinder 4 is too small to be caused pad cylinder 4 to produce with foil gauge 3 interacting, cause damage, cause measurement result inaccurate to foil gauge 3.
The wire 6 of the bolt normal strain measurement mechanism that the utility model provides is for connecting foil gauge 3 and strain measurement system, foil gauge 3 is connected with strain measurement system by through hole offered by pad cylinder 4 by wire 6, the strain information produced due to foil gauge 3 is transferred to strain measurement system by wire 6 by foil gauge, strain measurement system receives the strain information that foil gauge 3 is measured, in strain measurement system, the strain information of foil gauge 3 is shown after calculating, the information of display is the normal strain of bolt 1, the i.e. axial strain of bolt.
The reason of the lateral layout through hole of pad cylinder 4, that the wire 6 be connected with strain measurement system for foil gauge 3 passes pad cylinder 4 sidewall on the one hand, the situation that be can be observed foil gauge by the through hole on pad cylinder 4 on the other hand, namely in process of the test, whether foil gauge 3 is torn or other damages, avoid the test figure gathering mistake, affect and distribution and optimizing structure design are carried to stressed, structure partial loading conditions, the structure nail of bolt 1.Foil gauge 3 in the present embodiment is resistance strain gage, the principle of work of resistance strain gage makes based on strain effect, namely when conductor or semiconductor material produce mechanically deform under the effect of external force, its resistance value changes accordingly, and this phenomenon is called " strain effect ".Semiconductor gauge semiconductor material is made, and its principle of work is the piezoresistive effect of based semiconductor material.Piezoresistive effect refers to when a certain axis of semiconductor material is by External Force Acting, the phenomenon that its resistivity changes.Foil gauge is the element being configured for monitor strain by sensitive grid etc., during use, it is pasted onto on the measuring point of component securely, because measuring point strains after member stress, sensitive grid also makes its resistance change thereupon being out of shape, record its resistance variations size by instrumentation again, and be converted to the strain value of measuring point.Metal resistance strain gauge is various in style, various informative, common are wire form resistance strain gage and foil resistance foil gauge.Foil resistance foil gauge a kind ofly to make based on strain-resistance effect, by metal forming as sensitive grid, the dependent variable of test specimen can be converted to the sensitive element of resistance change.In the present embodiment, foil gauge 3 is foil resistance foil gauge.
The cross sectional shape of the through hole in the middle of the present embodiment, pad cylinder 4 side offered is rectangle, foil gauge 3 circumference that bolt 1 is pasted is wrapped in the polished rod part of bolt 1, then the bolt 1 being pasted with foil gauge 3 is enclosed within pad cylinder 4, foil gauge 3 is drawn wire 6, wire 6 is drawn out to by the rectangular through holes that pad cylinder 4 is offered and pads outside cylinder 4 and be connected with strain measurement system.
The bolt 1 that the normal strain measurement mechanism that the utility model provides adopts is machining product, and more general bolt is compared, and bolt 1 involved in the present embodiment is the bolt lengthened, and the part of lengthening is polished rod section, and polished rod section is for pasting foil gauge 3.Bolt 1 is through testpieces 2, and be provided with between bolt 1 and testpieces 2 and pad cylinder 4, the pad cylinder 4 in the present embodiment is machining product, and its configuration matches with the structure of the bolt 1 being pasted with foil gauge 3.The object arranging sleeve 4 between bolt 1 and testpieces 2 protects the structure of foil gauge 3, ensures the measuring accuracy of foil gauge 3.
Nut 5 coordinates fastening for testpieces 2 with bolt 1, in process of the test, testpieces 2 is stressed, power suffered on testpieces 2 is delivered on bolt 1 by pad cylinder 4 and nut 5, in this process, foil gauge 3 is pasted onto on bolt 1 and can produces deformation, this deformation reaches strain measurement system by wire 6, by the resistance variations information of foil gauge being converted to after strain measurement system process the strain information of bolt 1, and show in strain measurement system, and then namely the normal strain of bolt 1 directly draw by strain measurement system in process of the test, easy, accurate, quick.
More than be described in detail in conjunction with bolt normal strain measurement mechanism specific embodiment of the present utility model, but be not to restriction of the present utility model, everyly according to technical spirit of the present utility model, technical scope of the present utility model is all belonged to any simple modification made for any of the above embodiments, also it should be noted that, comprise the combination in any between each part mentioned above according to the category of bolt normal strain measurement mechanism technical scheme of the present utility model.
Claims (5)
1. a bolt normal strain measurement mechanism, it is characterized in that, comprise: bolt (1), testpieces (2), foil gauge (3), pad cylinder (4), nut (5), wire (6) and strain measurement system, wherein
Bolt (1), stage casing axial on screw rod is polished rod;
Testpieces (2), for being provided with the slab construction of bolt hole;
Foil gauge (3), is pasted onto the polished rod part on bolt (1);
Pad cylinder (4) is the cylindrical structure of hollow, and end face and the bottom surface of pad cylinder (4) are respectively arranged with upper bolt hole and lower bolt hole, and pad cylinder (4) side opening was provided with the through hole in axle center;
Wire (6), for connecting foil gauge (3) and strain measurement system;
Strain measurement system, for the treatment of and show the data that foil gauge (3) imports;
Bolt (1) is through testpieces (2) and pad cylinder (4) and tightened by nut (5), can be drawn the normal strain of bolt (1) by the data of foil gauge (3) importing strain measurement system.
2. bolt normal strain measurement mechanism as claimed in claim 1, it is characterized in that, described wire (6) is through the through hole of pad cylinder (4) side, and wherein one end connects described foil gauge (3), and the other end connects described strain measurement system.
3. bolt normal strain measurement mechanism as claimed in claim 1, is characterized in that, the equal diameters of the diameter of the upper bolt hole of described pad cylinder (4) and the screw rod of described bolt (1).
4. bolt normal strain measurement mechanism as claimed in claim 1, it is characterized in that, the diameter of the polished rod section of described bolt (1) and 2 times of thickness sums of described foil gauge (3), with the equal diameters of the lower bolt hole of described pad cylinder (4).
5. bolt normal strain measurement mechanism as claimed in claim 1, it is characterized in that, definition: the length of the polished rod part on the screw rod of described bolt (1) is L, described foil gauge (3) is a along the length that described bolt (1) is axial, wherein, L >=a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520797654.1U CN204988170U (en) | 2015-10-10 | 2015-10-10 | Bolt normal strain measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520797654.1U CN204988170U (en) | 2015-10-10 | 2015-10-10 | Bolt normal strain measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN204988170U true CN204988170U (en) | 2016-01-20 |
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| CN201520797654.1U Active CN204988170U (en) | 2015-10-10 | 2015-10-10 | Bolt normal strain measuring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533591A (en) * | 2018-06-21 | 2018-09-14 | 电子科技大学 | A kind of intelligent bolt that can monitor connection strain |
| CN110285905A (en) * | 2019-06-20 | 2019-09-27 | 眉山中车紧固件科技有限公司 | A kind of auxiliary device for the test of fastener clamping force |
| 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 |
-
2015
- 2015-10-10 CN CN201520797654.1U patent/CN204988170U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533591A (en) * | 2018-06-21 | 2018-09-14 | 电子科技大学 | A kind of intelligent bolt that can monitor connection strain |
| CN110285905A (en) * | 2019-06-20 | 2019-09-27 | 眉山中车紧固件科技有限公司 | A kind of auxiliary device for the test of fastener clamping force |
| 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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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |