CN209541971U - A kind of Axial stress in bolt sensor - Google Patents
A kind of Axial stress in bolt sensor Download PDFInfo
- Publication number
- CN209541971U CN209541971U CN201920007746.3U CN201920007746U CN209541971U CN 209541971 U CN209541971 U CN 209541971U CN 201920007746 U CN201920007746 U CN 201920007746U CN 209541971 U CN209541971 U CN 209541971U
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- China
- Prior art keywords
- strain
- bolt
- face
- axial stress
- sensing device
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Abstract
The utility model discloses a kind of Axial stress in bolt sensors, including bolt and strain-Sensing device；The strain-Sensing device is arranged on the end face of bolt head, and the strain-Sensing device is for detecting the compression strain for causing the end face of bolt head to generate in radial direction because bolt is by axial pre tightening force.Not only versatility is extensive for the Axial stress in bolt sensor, and of simple structure and low cost.
Description
Technical field
The utility model relates to bolt-connection state, the structural health monitoring technology field of tools for bolts ' pretension force monitoring methods,
More particularly to a kind of Axial stress in bolt sensor.
Background technique
Currently, bolt-connection is widely used in the various kinds of equipment and structure of the industries such as machinery, chemical industry, building, space flight, one
Aspect couples detachable part, on the other hand transmits the load between components, (show as axial pre tightening force is coupled situation
It is no enough) it is directly related to the trouble free service of whole equipment or structure.Torque wrench is commonly used in engineering controls bolt nominal torque,
It is difficult to realize the monitoring to the coupled situation of bolt in work.Resistance strain gage electrical measuring method is measure bolt axial pre tightening force one
Kind extensive method, such as Li Cong by the center Luo Gang in bolt along axial processing blind hole, foil gauge is mounted in blind hole
(Chinese utility model patent number: 201520276111.5)；Foil gauge is mounted on the smooth cylinder of Lengthened bolt by Guo Guifu etc.
(Chinese utility model patent number: 201310643341.6), bolt screw rod answering under responsive to axial force is measured by foil gauge
Become, determines bolt pretightening/Axial stress in bolt size.But it is buried along axial processing blind hole and in blind hole in bolt pitch
If foil gauge operating difficulties；Foil gauge is installed on the smooth cylinder of bolt, is difficult to realize in many occasions, therefore the above method is equal
Do not have wide applicability.
Utility model content
For overcome the deficiencies in the prior art, the purpose of utility model of the utility model is to provide a kind of with extensive
Versatility, Axial stress in bolt sensor of simple structure and low cost.
To achieve the goals above, technical solution content used by the utility model is specific as follows:
A kind of Axial stress in bolt sensor, including bolt and strain-Sensing device；The strain-Sensing device is arranged in spiral shell
On the end face of bolt head, the strain-Sensing device leads to the end of bolt head because bolt is by axial pre tightening force for detecting
The compression strain that face is generated in radial direction.
Further, the strain-Sensing device is strain ga(u)ge.
Preferably, the resistance-strain is calculated as radial strain meter.
It is highly preferred that the resistance-strain is calculated as annular strain gauge, the outer diameter and the bolt head of the annular strain gauge
The end face diameter in portion is suitable.
It is further preferred that the annular strain gauge includes two semiorbicular strain grid；The strain grid are arranged in institute
On the edge for stating the end face of bolt head.
Alternatively, the annular strain gauge includes the strain grid of several arcs；The strain grid are arranged in the bolt head
On the edge of the end face in portion.
Further, the strain-Sensing device is bonded on the end face of the bolt head.
Further, the external of the strain-Sensing device covers matcoveredn.
Compared with prior art, the utility model has the beneficial effects that:
The Axial stress in bolt sensor of the utility model is in the end face of its bolt head setting strain-Sensing device to detect
When the compression strain that front bolt is generated by axial pre tightening force in end face radial direction.The strain data that the sensor detects
Quantified by subsequent strain output circuit, to grasp the bolt-connection state of sensor.It is not only simple and reliable for structure,
And obtained sensor is not limited by bolt mounting condition, has wide applicability and low cost.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and being implemented in accordance with the contents of the specification, and in order to allow the above and other purpose, feature of the utility model
It can be more clearly understood with advantage, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the structure structure schematic diagram of the Axial stress in bolt sensor more preferably embodiment of the utility model；
Fig. 2 be cooperate the utility model Axial stress in bolt sensor carry out using strain output circuit more preferably implement
The structural schematic diagram of example；
Fig. 3 is the axial force measuration result schematic diagram of M14 bolt.
Wherein, each appended drawing reference are as follows: 1, strain-Sensing device；2, bolt.
Specific embodiment
Further to illustrate that the utility model is the technical means and efficacy reaching predetermined purpose of utility model and being taken,
Below in conjunction with attached drawing and preferred embodiment, to foundation specific embodiment of the present utility model, structure, feature and its effect, in detail
Carefully it is described as follows:
As shown in Figure 1, the Axial stress in bolt sensor of the utility model, including bolt 2 and strain-Sensing device 1；It is described
Strain-Sensing device 1 is arranged on the end face on 2 head of bolt, and the strain-Sensing device 1 is for detecting because bolt 2 is by axial direction
Pretightning force and the compression strain for causing the end face on 2 head of bolt to generate in radial direction.In order to simplify structure and be conducive to save
About production cost, in the present embodiment, the strain-Sensing device 1 are preferably strain ga(u)ge, the more preferable resistance-strain
It is calculated as radial strain meter.In order to be matched with the end surface shape on 2 head of bolt in order to the strain ga(u)ge is mounted on spiral shell
On the end face on 2 head of bolt, in the present embodiment, the resistance-strain is calculated as annular strain gauge.
Strain data detected by the Axial stress in bolt sensor of the utility model is required connect to when being quantified
It strains among output circuit, strains the working principle directly proportional to axial pre tightening force using the radial compression of bolt, pass through measurement
The size of radial compression strain goes to determine the size of axial pre tightening force, to grasp the bolt-connection state of sensor.Not only tie
Structure is simple and reliable, and obtained sensor is not limited by bolt mounting condition, has wide applicability and low cost.
Wherein, as shown in Fig. 2, the strain output circuit includes electric bridge, dynamic strain indicator and computer；The strain-Sensing device, electricity
Bridge, dynamic strain indicator and computer are successively electrically connected.The dynamic strain indicator includes the amplifier being successively electrically connected, oscillation
Device, phase-sensitive detector and low-pass filter.
Since when radial strain occurs, the strain of bolt head end face center position is smaller, and close to bolt end surface side
Strain at edge is relatively large.So in the present embodiment, preferably setting the outer diameter of the annular strain gauge to and the spiral shell
The end face diameter of bolt head is suitable, so as to measure the strain mean being located at the large strain of bolt end face edge, so
The purpose of measurement Axial stress in bolt is realized by the relationship demarcated in advance again afterwards.
It should be noted that in the present embodiment, the end face of the outer diameter and the bolt head of the annular strain gauge is straight
Diameter quite, in particular to, the outer diameter of the annular strain gauge is close or is slightly less than the outer diameter of bolt head end face.And this is practical new
Bolt used by type is the bolt of country or international standard size, selects correspondingly-sized annular to answer according to the concrete model of bolt
Become meter, forms the Axial stress in bolt sensor of different series.
Moreover, in the present embodiment, the annular strain gauge includes two semiorbicular strain grid；The strain grid setting
On the edge of the end face of the bolt head.As long as two semiorbicular strain grid are connected to each other, to may make up this practical new
The annular strain gauge of type.
Alternatively, in other embodiments, the annular strain gauge can also include the strain grid of several arcs；It is described to answer
Become on the edge for the end face that the bolt head is arranged in grid.It can also structure as long as the strain grid of several arcs are connected to each other
At the annular strain gauge of the utility model.
In order to realize being fixedly connected between strain-Sensing device and the end face of bolt head with simple connection type, when
The strain-Sensing device is resistance-strain timing, and the strain-Sensing device is fixed on the bolt head by bonding way
End face on.And in other embodiments, the strain-Sensing device can also be metallic film strain gauge, and work as the strain
When detection device is metallic film strain gauge, the strain-Sensing device is fixed on by vacuum coating, deposition or sputtering method
On the end face of the bolt head.
When testing, firstly, according to the corresponding standard object bolt of surveyed Object Selection, by 2 head end of bolt
Process finishing.Secondly, strain detecting is answered in the bolt head end face of selection outer diameter corresponding with 2 head opposite side size of bolt
Device 1 is mounted on 2 head end of bolt.Then after lead wire set electric bridge, the strain-Sensing device 1 in bolt head end face, which is cladded with, to be protected
Sheath (not shown) protects bolt head end face strain gauge 1, and then forms Axial stress in bolt sensor.In the present embodiment, institute
Stating protective layer is HBM protective glue, and the thickness of protective layer is reduced to 10% between 1-3 mm, by the wear rate of strain-Sensing device
Hereinafter, ensuring the use sensitivity of impedance detection device 90% or more simultaneously.
After the Axial stress in bolt sensor group electric bridge made, stretching calibration is carried out first in Material Testing Machine, benefit
With relationship directly proportional between axial force and output strain, the demarcating file between axial force suffered by bolt and output strain is obtained
Afterwards, in testing by Axial stress in bolt sensor application, by the strain measured, 2 axial force of bolt is obtained according to demarcating file
Size, and then obtain the coupled situation of bolt 2.
Below by taking M14 bolt as an example, the working principle of the Axial stress in bolt measuring device of the utility model is further illustrated:
After standard M14 bolt head section is processed finishing, installation diameter is corresponding to the bolt head end face of 15mm
Strain ga(u)ge, the diameter of the strain ga(u)ge are 13mm.Strain ga(u)ge lead is accessed into subsequent conditioning circuit, composition 1/4 half
It is accessed after bridge circuit among subsequent deformeter circuit, tension test has been carried out on testing machine.Test result such as Fig. 3 institute three times
Show, experiment results proved: having between axial force suffered by the output of the strain ga(u)ge of bolt head end face and bolt good
Linear relationship, so as to by the Axial stress in bolt measuring device described in the utility model measure axial force suffered by bolt and
Realize the monitoring to the bolt-connection state.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (8)
1. a kind of Axial stress in bolt sensor, it is characterised in that: including bolt and strain-Sensing device；The strain-Sensing device
It is arranged on the end face of bolt head, the strain-Sensing device leads to bolt because bolt is by axial pre tightening force for detecting
The compression strain that the end face on head is generated in radial direction.
2. Axial stress in bolt sensor according to claim 1, it is characterised in that: the strain-Sensing device is answered for resistance
Become meter.
3. Axial stress in bolt sensor according to claim 2, it is characterised in that: the resistance-strain is calculated as radial strain
Meter.
4. Axial stress in bolt sensor according to claim 3, it is characterised in that: the resistance-strain is calculated as annular strain
The outer diameter of meter, the annular strain gauge is suitable with the end face diameter of the bolt head.
5. Axial stress in bolt sensor according to claim 4, it is characterised in that: the annular strain gauge includes two and half
The strain grid of annular；On the edge for the end face that the bolt head is arranged in the strain grid.
6. Axial stress in bolt sensor according to claim 4, it is characterised in that: the annular strain gauge includes several
The strain grid of arc；On the edge for the end face that the bolt head is arranged in the strain grid.
7. Axial stress in bolt sensor described in -6 any one according to claim 1, it is characterised in that: the strain detecting dress
It sets and is bonded on the end face of the bolt head.
8. Axial stress in bolt sensor described in -6 any one according to claim 1, it is characterised in that: the strain detecting dress
The external covering matcoveredn set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920007746.3U CN209541971U (en) | 2019-01-03 | 2019-01-03 | A kind of Axial stress in bolt sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920007746.3U CN209541971U (en) | 2019-01-03 | 2019-01-03 | A kind of Axial stress in bolt sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209541971U true CN209541971U (en) | 2019-10-25 |
Family
ID=68268238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920007746.3U Expired - Fee Related CN209541971U (en) | 2019-01-03 | 2019-01-03 | A kind of Axial stress in bolt sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209541971U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612626A (en) * | 2019-01-03 | 2019-04-12 | 武汉科技大学 | A kind of Axial stress in bolt sensor |
-
2019
- 2019-01-03 CN CN201920007746.3U patent/CN209541971U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612626A (en) * | 2019-01-03 | 2019-04-12 | 武汉科技大学 | A kind of Axial stress in bolt sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191025 Termination date: 20210103 |
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| CF01 | Termination of patent right due to non-payment of annual fee |