CN206399570U - Dynamometry bolt - Google Patents
Dynamometry bolt Download PDFInfo
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- CN206399570U CN206399570U CN201621377383.5U CN201621377383U CN206399570U CN 206399570 U CN206399570 U CN 206399570U CN 201621377383 U CN201621377383 U CN 201621377383U CN 206399570 U CN206399570 U CN 206399570U
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- sensing element
- bolt
- mounting hole
- lead
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Abstract
The utility model is related to tools for bolts ' pretension monitoring technical field, more particularly to a kind of dynamometry bolt, including bolt body, sensing element and protection device；Bolt body axially offers mounting hole, and sensing element is arranged in mounting hole, and the lead-out wire of sensing element is used to electrically connect with the wire of external test circuitry；Protection device is arranged on the openend of mounting hole, the junction of the wire for protecting lead-out wire and external test circuitry.The dynamometry bolt that the utility model is provided, sensing element is packaged in the mounting hole of bolt body, so, the influence of the external environmental factors such as temperature, greasy dirt and moment of flexure and moment of torsion for measurement can be reduced, further, axial line by sensing element along bolt body is installed, and can realize the height-precision measurement to bolt axial pre tightening force.In addition, protecting the lead-out wire of sensing element by protection device, lead-out wire under tension can be avoided and be broken, improve the robustness of test block.
Description
Technical field
The utility model is related to tools for bolts ' pretension monitoring technical field, more particularly to a kind of dynamometry bolt.
Background technology
Bolt can extend when being acted on by axial tension, and its internal produces strains accordingly.In the elastic range of material
Interior, the size of pulling force is linear suffered by the size and bolt of strain.Using the sensing element being made up of sensitive grid etc., by it
It is pasted onto securely on the measuring point of component, because measuring point is strained after member stress, sensitive grid also makes its electricity therewith deforming
Resistance changes, then measures its resistance variations size by instrumentation, and is converted to the strain value of measuring point.Pass through the measurement of strain
With the demarcation of signal, the size of Axial stress in bolt more can be accurately obtained, so as to be the design related to Axial stress in bolt
Type selecting, the determination of assembly technology parameter etc. provide foundation.
The test of traditional Axial stress in bolt, is to paste 4 sensing elements on the surface of bolt, is accessed favour stone electricity
Bridge.By the frock of particular design, pretightning force is applied to bolt, rower is entered by the relation for gathering output signal and pretightning force
It is fixed, so as to realize the measurement to bolt pretightening.
But, this kind of test mode is in bolt surface mount sensing element, and the precision of test result is by such environmental effects
It is larger；The scheme of surface patch, it is impossible to exclude the influence of bolt moment of flexure and moment of torsion to test result；Test result is by environment, spiral shell
The factor such as bolt bending and torsion is larger, and the easy under tension fracture of lead-out wire of sensing element, the robustness of testing scheme
It is poor.
Utility model content
Based on this, it is necessary to for the influence of bolt moment of flexure and moment of torsion to test result can not be excluded；Test result is by ring
The factors such as border, bolts bend and torsion are larger, and the lead-out wire easy under tension fracture of sensing element, testing scheme it is strong
Strengthening the problem of property is poor, there is provided a kind of dynamometry bolt.
Above-mentioned purpose is achieved through the following technical solutions：
A kind of dynamometry bolt, including bolt body, sensing element and protection device；Bolt body axially offers installation
Hole, sensing element is arranged in mounting hole, and the lead-out wire of sensing element is used to electrically connect with the wire of external test circuitry；Protection
Device is arranged on the openend of mounting hole, the junction of the wire for protecting lead-out wire and external test circuitry.
In one of which embodiment, protection device includes being provided with hollow part on flexible fastening seat, flexible fastening seat
Position, hollow part is used to housing the junction of lead-out wire and the wire of external test circuitry, and by adhesive by lead-out wire with
The junction of the wire of external test circuitry is fixed on hollow part.
In one of which embodiment, flexible fastening seat is rubber fixed seat.
In one of which embodiment, rubber fixed seat is fixed on the head of bolt body by adhesive.
In one of which embodiment, protection device includes connection-peg；Connection-peg is arranged on the openend of mounting hole, inserts
Joint is used to electrically connect with the lead-out wire of sensing element.
In one of which embodiment, connection-peg is threadedly attached in the openend of mounting hole.
In one of which embodiment, adhesive is filled between connection-peg and the openend of mounting hole.
In one of which embodiment, sensing element is in strip, and the length direction and bolt body of sensing element
Bearing of trend it is consistent.
In one of which embodiment, sensing element is rectangle, and the center line of sensing element along its length with
The axis of bolt body is located on the same line.
In one of which embodiment, sensing element is fixed in mounting hole by adhesive.
Above-mentioned dynamometry bolt, sensing element is packaged in the mounting hole of bolt body, so, it is possible to reduce temperature, oil
The external environmental factors such as dirt and moment of flexure and moment of torsion for measurement influence, further, by sensing element along bolt body
Axis is installed, and can realize the height-precision measurement to bolt axial pre tightening force.In addition, protecting sensing element by protection device
Lead-out wire, lead-out wire under tension can be avoided and be broken, improve test block robustness.
Brief description of the drawings
The structural representation for the dynamometry bolt that Fig. 1 provides for the utility model one embodiment；
The structural representation for the dynamometry bolt that Fig. 2 provides for the utility model another embodiment.
Wherein：
100- bolt bodies；
110- mounting holes；
200- sensing elements；
300- protection devices；
310- flexible fastenings seat；311- hollow parts；
320- connection-pegs.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, by the following examples, and tie
Accompanying drawing is closed, dynamometry bolt of the present utility model is further elaborated.It should be appreciated that specific implementation described herein
Example only to explain the utility model, is not used to limit the utility model.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or can also have element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " when,
In the absence of intermediary element.Term as used herein " vertically ", " level ", "left", "right" and similar statement are
For illustrative purposes.
As shown in Figure 1 or 2, the dynamometry bolt of the embodiment of the utility model one, including bolt body 100, sensing element
200 and protection device 300；Bolt body 100 axially offers mounting hole 110, and sensing element 200 is arranged in mounting hole 110,
The lead-out wire of sensing element 200 is used to electrically connect with the wire of external test circuitry；Protection device 300 is arranged on mounting hole 110
Openend, the junction of the wire for protecting lead-out wire and external test circuitry.
Wherein, the species of sensing element 200 can be to be a variety of, such as：Piezoelectric membrane, grating sensor or foil gauge etc.
Deng preferably resistance strain gage, the lead-out wire of resistance strain gage is electrically connected with the wire of external test circuitry, so as to logical
The change of monitoring strain sheet resistance is crossed, bolt strained change is obtained.
The shape of sensing element 200 can also have a variety of, it is preferable that sensing element 200 is in strip, and sensing element
200 length direction is square consistent with the extension of bolt body 100.Wherein, sensing element 200 is preferably rectangle, may be used also
Think cylindrical shape, the axis of the center line and bolt body 100 of sensing element 200 is located on the same line, in other words,
The axis that the center line and bolt body 100 of the mounting hole 110 of sensing element 200 is exactly fixedly mounted is located along the same line,
And center line of the sensing element 200 along mounting hole 110 is fixedly mounted.
The cross sectional shape of mounting hole 110 can be to be a variety of, such as：Circular, oval, square or polygon etc., this
Art personnel can select the cross sectional shape of mounting hole 110 as needed, preferably circle.The knot of mounting hole 110
Configuration formula can also be a variety of, such as unthreaded hole or stepped hole, it is preferable that mounting hole 110 is unthreaded hole, and its diameter is less than 2mm；
Or, mounting hole 110 is stepped hole, uses that upper end is M6 screwed holes and lower end is that diameter 2mm unthreaded holes are combined.
In addition, the mode that sensing element 200 is arranged on mounting hole 110 can be a variety of, it is preferable that use adhesive, lead to
Installation and fixation that the techniques such as encapsulating, solidification complete sensing element 200 are crossed, sensing element 200 is fixedly mounted on apart from mounting hole
At 110 bottom surface 2mm-3mm so that sensing element 200 can be generally within the shaft core position of bolt body 100 at, beneficial to survey
Measure the accurate of data.
Sensing element 200 has the lead-out wire that is connected with external test circuitry, wherein, lead-out wire and external test circuitry
The connected mode of wire can be to be a variety of, such as：Bond, weld etc., preferably weld.The structure shape of protection device 300
Formula can be to be a variety of, such as：Protection device 300 can be gum cover pipe, and lead-out wire and external testing electricity are located at using gum cover pipe sleeve
The junction of the wire on road, and gluing fixation is carried out with gum cover pipe, so as to be played a protective role to above-mentioned junction, it is to avoid sensitive
The lead-out wire of element 200 is broken because being pullled by external force.Certainly, protection device 300 can also be other structures.
Dynamometry bolt in the present embodiment, axially mounting hole 110, and the center of mounting hole 110 are opened up in bolt body 100
The axis of line and bolt body 100 is located along the same line, and sensing element 200 is fixedly mounted in mounting hole 110, this
Sample, sensing element 200 is located at the axle center of bolt, it is possible to reduce the external environmental factor such as temperature, greasy dirt and moment of flexure and moment of torsion
For the influence of measurement, and then the height-precision measurement to bolt axial pre tightening force can be realized.In addition, passing through protection device
The lead-out wire of 300 protection sensing elements 200, can avoid lead-out wire under tension and be broken, improve the robustness of test block.
Referring to Fig. 1, as a preferred embodiment, protection device 300 includes flexible fastening seat 310, flexible fastening
Hollow part 311 is provided with seat 310, hollow part 311 is used for the connection for housing lead-out wire and the wire of external test circuitry
Place, and the junction of lead-out wire and the wire of external test circuitry is fixed on by hollow part 311 by adhesive.
Wherein, the material of flexible fastening seat 310 can be the flexible material of rubber or silica gel etc., it is preferred that
Flexible fastening seat 310 is rubber fixed seat.
Flexible fastening seat 310 can be with the connected mode of bolt body 100 it is a variety of, for example：Clamping, bonding or screw thread
Connection etc..Preferably, flexible fastening seat 310 is bonded in the head of bolt body 100, i.e. rubber fixed seat passes through adhesive
It is fixed on the head of bolt body 100.Flexible fastening seat 310 can be so reduced as far as possible to come off from bolt body 100
Probability, improve protection device 300 stability.
In the present embodiment, lead-out wire is protected using flexible fastening seat 310, so as to pass through bullet when bolt is involved by external force
The deformation of property fixed seat 310 buffers active force of the external force to lead-out wire, so as to play a part of protection to lead-out wire.
Referring to Fig. 2, as another preferred embodiment, protection device 300 includes connection-peg 320；Connection-peg 320 is set
Put in the openend of mounting hole 110, connection-peg 320 is used to electrically connect with the lead-out wire of sensing element 200.So, the present embodiment
In dynamometry bolt need not be electrically connected always with external test circuitry, can only need measurement when connect external circuit, i.e.,
By the way that the plug of external test circuitry is inserted in connection-peg 320, being electrically connected for external test circuitry and sensing element 200 is realized
Connect, use is more convenient.And the connected mode of connection-peg 320 and the openend of mounting hole 110 can be it is a variety of, for example：Screw thread connects
Connect, gluing or clamping etc..
Further, adhesive is filled between the openend of connection-peg 320 and mounting hole 110.In connection-peg 320 and peace
Filling adhesive can reduce the possibility of the loosening of connection-peg 320 as far as possible between filling the openend in hole 110, improve protection dress
Put 300 stability.
The utility model embodiment illustrates that the lead-out wire of foil gauge connects so that sensing element 200 is resistance strain plate as an example
Enter Wheatstone bridge, and then complete the demarcation and test to Axial stress in bolt.
When in use, bolt twists solid on connector, the lead-out wire access Wheatstone bridge of foil gauge, during working bolt,
Due to bolt strained deformation, cause the change of the internal strain sheet resistance of bolt body 100, and there is linear relationship between the two, lead to
The delta data of resistance can accurately be measured by crossing Wheatstone bridge.The situation of change strained by monitoring bolt, can be obtained
Bolt strained change is obtained, so as to be that the design selection related to Axial stress in bolt, the determination of assembly technology parameter etc. provide foundation.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to the utility model the scope of the claims.It should be pointed out that for the common of this area
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of dynamometry bolt, it is characterised in that including bolt body, sensing element and protection device；The bolt body axle
To mounting hole is offered, the sensing element is arranged in the mounting hole, and the lead-out wire of the sensing element is used for and outside
The wire electrical connection of test circuit；The protection device is arranged on the openend of the mounting hole, for protect lead-out wire with it is outer
The junction of the wire of portion's test circuit.
2. dynamometry bolt according to claim 1, it is characterised in that the protection device includes flexible fastening seat, described
Hollow part is provided with flexible fastening seat, the hollow part is used to house the lead-out wire and the wire of external test circuitry
Junction, and the junction of the lead-out wire and the wire of external test circuitry is fixed on by the hollow part by adhesive
Position.
3. dynamometry bolt according to claim 2, it is characterised in that the flexible fastening seat is rubber fixed seat.
4. dynamometry bolt according to claim 3, it is characterised in that the rubber fixed seat is fixed on institute by adhesive
State the head of bolt body.
5. dynamometry bolt according to claim 1, it is characterised in that the protection device includes connection-peg；The grafting
Head is arranged on the openend of the mounting hole, and the connection-peg is used to electrically connect with the lead-out wire of the sensing element.
6. dynamometry bolt according to claim 5, it is characterised in that the connection-peg is threadedly attached in the installation
The openend in hole.
7. dynamometry bolt according to claim 6, it is characterised in that the openend of the connection-peg and the mounting hole it
Between be filled with adhesive.
8. dynamometry bolt according to claim 1, it is characterised in that the sensing element is in strip, and the sensitivity
The length direction of element is consistent with the bearing of trend of the bolt body.
9. dynamometry bolt according to claim 8, it is characterised in that the sensing element is rectangle, and the sensitivity
The axis of the center line of element along its length and the bolt body is located on the same line.
10. dynamometry bolt according to claim 1, it is characterised in that the sensing element is fixed on institute by adhesive
State in mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377383.5U CN206399570U (en) | 2016-12-14 | 2016-12-14 | Dynamometry bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377383.5U CN206399570U (en) | 2016-12-14 | 2016-12-14 | Dynamometry bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206399570U true CN206399570U (en) | 2017-08-11 |
Family
ID=59512111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621377383.5U Active CN206399570U (en) | 2016-12-14 | 2016-12-14 | Dynamometry bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206399570U (en) |
-
2016
- 2016-12-14 CN CN201621377383.5U patent/CN206399570U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190613 Address after: 100037 No. 2 Yuetan North Street, Xicheng District, Beijing Patentee after: China Astronautics Standards Institute Address before: 100071 No. 89 Xiaotun Road, Fengtai District, Beijing Patentee before: Beijing hangbiao Huake electromechanical High Technology Co. Ltd. |