CN208919012U - A kind of dynamometry bolt - Google Patents
A kind of dynamometry bolt Download PDFInfo
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- CN208919012U CN208919012U CN201821699902.9U CN201821699902U CN208919012U CN 208919012 U CN208919012 U CN 208919012U CN 201821699902 U CN201821699902 U CN 201821699902U CN 208919012 U CN208919012 U CN 208919012U
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- bolt
- sensing element
- elastic
- elastic sensing
- receiving hole
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Abstract
The utility model discloses a kind of dynamometry bolts, including bolt body and elastic sensing element, the elastic sensing element includes elastic component ontology and foil gauge, it is provided with a side plane on elastic body, four pieces of foil gauges R1, R2, R3, R4 are posted on the side plane and form favour stone full-bridge circuit；The stickup direction of two adjacent foil gauges is mutually perpendicular to；One end setting of elastic body is fluted, and the lead of four pieces of foil gauges is drawn out of this groove.The bolt body includes nut and stud, axially downwardly opens up receiving hole along bolt body in screw cap end；The elastic sensing element is embedded in the receiving hole, keeps the side plane axially parallel with bolt；Elastic sensing element is allowed to become one structure with bolt body.The bolt of the utility model can pulling force size suffered by real-time measurement bolt, and then the stress condition of structure where monitoring bolt has the advantages that measurement result is accurate, mechanical structure is simple, easy to use.
Description
Technical field
The present invention relates to a kind of bolts, and in particular to a kind of bolt that real-time measurement bolt pretightening may be implemented.
Background technique
In Marine engineering, electricity power engineering, hydraulic engineering, the fields such as bridge construction engineering all exist a lot such as blower, ocean
The heavy construction structures such as platform, bridge, power transmission tower, port machine, ship, in these structures, bolt are essential components, it
Be widely used in each component of fixation.These bolts play very important effect to entire large scale structure, work as large scale structure
When deformation occurs, the stress that these bolts for fixing each component are carried will change at first.So the inspection of bolt pretightening
Survey is highly important.
Common tools for bolts ' pretension force snesor is broadly divided into two classes on the market at present, and one kind is directly to measure bolt to generate
Pretightning force, one kind are indirect measurement bolt pretightenings.
The first kind: dynamometry bolt/tools for bolts ' pretension force snesor this be a kind of sensing bolt directly as load-sensing unit
Device will act at the power on bolt in a manner of most direct and measure, and structure is simple, and measurement is accurate, be scientific research and mechanics prison
The first choice of survey.
Second class: ring washer weighing sensor is measured at nut indirectly by increasing the washer sensor at bolt
Pressure, to obtain pretightning force suffered by bolt, ring washer will have enough sizes to install sensing device and mesh
One of the major way of front bolt pretightning force test.
Both the above mode all can not carry out real-time monitoring to the pretightning force of bolt, also just not accomplish the reality to total
When monitor.
Summary of the invention
The object of the present invention is to provide the real-time monitoring tools for bolts ' pretension that a kind of structure is simple, and the service life is long, more safe and reliable
The bolt of power, and then realize and the overall structure where bolt is accomplished to monitor in real time, forewarning function.
In order to achieve the above object, technical solution proposed by the present invention is as follows:
A kind of dynamometry bolt, including bolt body and elastic sensing element, the elastic sensing element include elastic component sheet
Body and foil gauge are provided with a side plane on elastic body, and four pieces of foil gauges R1, R2, R3, R4 are posted on the side plane
Form favour stone full-bridge circuit；The stickup direction of two adjacent foil gauges is mutually perpendicular to；One end setting of elastic body is fluted,
The lead of four pieces of foil gauges is drawn out of this groove.
The bolt body includes nut and stud, axially downwardly opens up receiving hole along bolt body in screw cap end；It is described
Elastic sensing element is embedded in the receiving hole, keeps the side plane axially parallel with bolt；Allow elastic sensing element and bolt body
It becomes one structure.
Further: the elastic sensing element is cylinder, and the corresponding receiving hole is all cylindrical hole.
It is further: internal screw thread is set in the receiving hole, and elastic sensing element, which is connected through a screw thread, is fixed on receiving hole
It is interior to become one structure with bolt body.
Further: the elastic sensing element further includes the miniature air plug of 4 cores, is fixed on elastic body and opens up groove
One end.
Further: cap body is arranged in one end of the elastic sensing element, and lead hole is opened up in cap body.
Further: the stickup direction of described foil gauge R1, R2, R3, R4 are followed successively by vertical direction, water along the side plane
Square to, vertical direction, horizontal direction.
A kind of bolt strained test method, characterized by the following steps:
A blind hole is axially downwardly opened up along it at the nut center of tested bolt；
It is embedded in the elastic sensing element for posting foil gauge in blind hole, elastic sensing element and tested bolt is made to become one
Body；
The lead of elastic sensing element is connect by miniature air plug with dynamometer, the tested bolt is read on dynamometer
Stress data.
Further: elastic sensing element includes one elastic sensing element of any of the above in step (2).
The solution have the advantages that:
The present invention is internally embedded integrated elastic sensing element in bolt, makes the stress condition of elastic sensing element and is used for
The bolt of connection is consistent, can be measured on elastic sensing element using 4 sheet resistance foil gauges composition favour stone full-bridge circuit
Corresponding stress can be obtained further according to the elasticity modulus of elastic sensing element in the strain value of elastic sensing element.Of the invention
Bolt can pulling force size suffered by real-time measurement bolt, and then the stress condition of structure where monitoring bolt has measurement result
Precisely, simple, the easy to use advantage of mechanical structure.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
In the accompanying drawings:
Fig. 1 is schematic structural view of the invention.
Fig. 2-1 is bolt body structural schematic diagram one of the present invention.
Fig. 2-2 is bolt body structural schematic diagram two of the present invention；
Fig. 3-1 is elastic sensing element schematic diagram one of the present invention.
Fig. 3-2 is elastic sensing element schematic diagram two of the present invention.
Fig. 3-3 is elastic sensing element schematic diagram three of the present invention.
Fig. 4 is strain gauge adhesion position view of the present invention.
Fig. 5 is full-bridge circuit schematic diagram of the invention.
Fig. 6 is the overall schematic after the present invention assembles.
Fig. 7 is ess-strain calibration curve of the present invention.
Wherein, the above drawings include the following reference numerals: bolt body 100, nut 110, stud 120, receiving hole 130；
Elastic sensing element 200, foil gauge 210, cap body 220, through-hole 221.
Specific embodiment
Come that the present invention will be described in detail below in conjunction with attached drawing and specific embodiment, illustrative examples therein and says
It is bright to be only used to explain the present invention, but it is not intended as inappropriate limitation of the present invention.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, a kind of dynamometry bolt, including bolt body and elastic sensing element, the elastic sensing element packet
Elastic component ontology and foil gauge are included, a side plane is provided on elastic body, four pieces of foil gauges are posted on the side plane
R1, R2, R3, R4 form favour stone full-bridge circuit；The stickup direction of two adjacent foil gauges is mutually perpendicular to；One end of elastic body
It is arranged fluted, the lead of four pieces of foil gauges is drawn out of this groove；The bolt body includes nut and stud, in screw cap end
Receiving hole is axially downwardly opened up along bolt body；The elastic sensing element is embedded in the receiving hole, makes the side plane and bolt
It is axial parallel；Elastic sensing element is allowed to become one structure with bolt body.
By by elastic sensing element stud bolt ontology, under the premise of not changing bolt original effect, Ke Yigeng
Good realization monitors the stress condition of bolt, and then it is various to carry out safety etc. to the total for having bolt to participate in
Monitoring.
The present invention offsets the influence that the stress generated after bolt processing is concentrated, while rating test by setting safety coefficient
When can detect processing after the underproof product of mechanical property, be further ensured that integrally-built safety.
Elastic sensing element can be fixed on inside bolt body by modes such as welding, spiral connection, glue, herein not
It limits.
The output end of foil gauge can be connect by wireless transmission mode with dynamometer, more convenient reliable, be realized
Line or long-range control, it is not limited here.
Explanation is explained in more detail to the present invention by a specific embodiment herein:
Selecting M12 × 60, performance rate to be 4.8 grades, (Nominal Tensile 400MPa, surrender ratio are 0.8, and nominal is bent
Take intensity 320MPa) bolt as bolt body 100.
Made a call on bolt a diameter be 3mm, the threaded hole that depth is 32.5mm, it is as shown in Figure 2 to form bolt to be measured.
The bolt of M3 × 32.5 is processed, the side of 27.5mm length is cut under nut, and to have it smooth
Plane be used to paste foil gauge, made a call on nut two diameters be 1.5mm aperture extraction lead (on the bolt of not nut,
Open up groove), as shown in Figure 3.
Successively stick four resistance strain gages, respectively R1, R2, R3, R4 such as Fig. 4 institute from top to bottom on the side cut
Show.Four foil gauges are formed into favour stone full-bridge circuit, circuit diagram is as shown in Figure 5.The elasticity for posting foil gauge is sensitive
Element screws in bolt to be measured and fixes, and it is as shown in Figure 6 to constitute dynamometry bolt.
The working principle of the invention is achieved in that
In the case where bolt under tension to be measured effect, the pulling force that bolt is subject to is transmitted to elastic quick by fixed contact
On sensing unit, bolt strain is experienced by the foil gauge full-bridge circuit being pasted on elastic sensing element, and pass through modulation electricity
Signal is amplified on road and number converts the final test for realizing bolt tension force.
Bolt to be measured is by fastening force F when assembling bolt, and for the foil gauge on elastic sensing element, R1 and R3 tension is answered
Power, R2 and R4 compression chord.
The wherein stretching strain on R1 and R3 are as follows:
Compressive strain on R2 and R4 are as follows:
Then electric bridge exports strain value εTAre as follows:
Wherein μ is the Poisson's coefficient of elastic element, and A is the sectional area of elastic element, and E is the elasticity modulus of elastic element.
Dynamometry bolt both ends are fixed on cupping machine, apply different load in draw direction, full-bridge circuit is accessed and is strained
Measuring instrument records strain data, back and forth the above process three times, and it is as shown in Figure 7 to obtain calibration curve.It is obtained by rating test
The indexs such as the linearity, multiplicity form the calibration equation of full-bridge circuit.Dynamometry bolt can be accurately measured according to calibration equation
Value of thrust.
In order to reduce the stress situation of bolt internal holes, the elastic sensing element is cylinder, the corresponding appearance
Receiving hole is all cylindrical hole.Cylindrical receiving hole, is more favorable for processing, the installation and removal of elastic sensing element are all simple.
For the ease of connection: internal screw thread being arranged in the receiving hole, elastic sensing element, which is connected through a screw thread, is fixed on appearance
It receives and is become one structure in hole with bolt body.Bolted mode can allow elastic sensing element to reuse and make
With.
Foil gauge is connect with dynamometer using by miniature air plug in the present invention.The elastic sensing element further includes
The miniature air plug of 4 cores is fixed on and opens up one end of groove on elastic body and (do not limit and hold herein, but in order to preferably process
Manufacture and simplified structure, groove setting is held herein).
If select with cap body bolt as elastic sensing element for, through-hole is opened up in cap body to be more easier
Processing: therefore cap body is arranged in one end of the elastic sensing element, and lead hole is opened up in cap body.The cap body of one can be right
The part of insertion receiving hole is effectively protected, and stops foreign object intrusion effect test result.In addition in use,
The installation and removal of the more convenient elastic sensing element of cap body.
Due to needing to measure the strain of X, Y both direction, the stickup direction of described foil gauge R1, R2, R3, R4 are along institute
It states side plane and is followed successively by vertical direction, horizontal direction, vertical direction, horizontal direction.
To the method that existing connection bolt carries out real-time monitoring, following steps can be used:
(1) blind hole is axially downwardly opened up along it at the nut center of tested bolt；
(2) it is embedded in blind hole and posts the elastic sensing element of foil gauge, become elastic sensing element with tested bolt
One；
(3) lead of elastic sensing element is connect by miniature air plug with dynamometer, it is tested that this is read on dynamometer
The stress data of bolt.
Further: elastic sensing element includes one elastic sensing element of any of the above in step (2).
By above method, the detection and analysis of stress condition can be done to existing any bolt, and then to whole knot
Structure does monitoring analysis.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of dynamometry bolt, it is characterised in that: including bolt body and elastic sensing element,
The elastic sensing element includes elastic component ontology and foil gauge, a side plane is provided on elastic body, described
Four pieces of foil gauges R1, R2, R3, R4 are posted on side plane forms favour stone full-bridge circuit；The stickup direction of two adjacent foil gauges
It is mutually perpendicular to；One end setting of elastic body is fluted, and the lead of four pieces of foil gauges is drawn out of this groove；
The bolt body includes nut and stud, axially downwardly opens up receiving hole along bolt body in screw cap end；The elasticity
Sensing element is embedded in the receiving hole, keeps the side plane axially parallel with bolt；Elastic sensing element is allowed to become with bolt body
Integral structure.
2. dynamometry bolt according to claim 1, it is characterised in that: the elastic sensing element is cylinder, is corresponded to
The receiving hole be all cylindrical hole.
3. dynamometry bolt according to claim 2, it is characterised in that: internal screw thread is arranged in the receiving hole, elasticity is sensitive
Element is connected through a screw thread to be fixed in receiving hole and become one structure with bolt body.
4. dynamometry bolt according to claim 1, it is characterised in that: the elastic sensing element further includes the miniature boat of 4 cores
It inserts, is fixed on the one end for opening up groove on elastic body.
5. dynamometry bolt according to claim 1, it is characterised in that: cap body is arranged in one end of the elastic sensing element,
Lead hole is opened up in cap body.
6. dynamometry bolt according to claim 1, it is characterised in that: the stickup direction of described foil gauge R1, R2, R3, R4
Vertical direction, horizontal direction, vertical direction, horizontal direction are followed successively by along the side plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821699902.9U CN208919012U (en) | 2018-10-19 | 2018-10-19 | A kind of dynamometry bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821699902.9U CN208919012U (en) | 2018-10-19 | 2018-10-19 | A kind of dynamometry bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208919012U true CN208919012U (en) | 2019-05-31 |
Family
ID=66709849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821699902.9U Active CN208919012U (en) | 2018-10-19 | 2018-10-19 | A kind of dynamometry bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208919012U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268375A (en) * | 2018-10-19 | 2019-01-25 | 上海大学 | A kind of dynamometry bolt |
-
2018
- 2018-10-19 CN CN201821699902.9U patent/CN208919012U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109268375A (en) * | 2018-10-19 | 2019-01-25 | 上海大学 | A kind of dynamometry bolt |
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