CN105424481B - A kind of threaded fastener ensures load test device and method of testing - Google Patents
A kind of threaded fastener ensures load test device and method of testing Download PDFInfo
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- CN105424481B CN105424481B CN201511003529.XA CN201511003529A CN105424481B CN 105424481 B CN105424481 B CN 105424481B CN 201511003529 A CN201511003529 A CN 201511003529A CN 105424481 B CN105424481 B CN 105424481B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention provides a kind of threaded fastener to ensure load test device, including pushing tow pre-tightening apparatus, pressure-detecting device, stud, nut to be measured, fastener, the lower end of stud is installed on fastener, the nut thread to be measured is installed on the thread segment of stud, on stud sleeve is set with above nut to be measured, the lower end of sleeve contacts cooperation with nut to be measured, pushing tow pre-tightening apparatus includes pushing tow pre-load nut mechanism and the first pad, pushing tow pre-load nut mechanism is installed on the thread segment of stud, first pad is sleeved on stud and between pre-load nut mechanism and sleeve, pressure-detecting device is installed on stud or sleeve, the test device is simple in construction, load capability is strong, it is simple to operate to realize reuse, adapt to a variety of big sized bolts or nut and ensure load test.The invention also discloses the method for testing that threaded fastener ensures load, this method in addition to be particularly suitable for use in the bolt of big specification or the guarantee load test of nut.
Description
Technical field
The present invention relates to a kind of threaded fastener to ensure load test device and method of testing.
Background technology
Threaded fastener ensures that load is to detect the important indicator of threaded fastener mechanical property, with oil refining, chemical industry
And the development of the field devices such as nuclear power maximization, it is desirable to pressure vessel is run at high temperature under high pressure, so, the spiral shell needed in equipment
Bolt, nut diameter also accordingly increase, to ensure the reliability of connection and security, it is necessary to the load that given one's hand to bolt, nut
The requirement of lotus test.
The tensile load limit that the tensile testing machine of current most of testing agency can be provided is 2.94 × 106N
(300t), it is directed to and ensures load 2.94 × 106More than N (300t) big sized bolt, nut are also without complete experiment
Condition, more than 39mm big sized bolt, nut are more than especially for diameter, still without complete experiment condition, so greatly
Sized bolt, the guarantee load test of nut are all the technical barrier in terms of fastener performance test all the time.It is in addition, traditional
Threaded fastener ensure that the test device of load is all that bolt, the nut being only capable of for certain specific standard carry out guarantee load
Test, when the specification of bolt to be measured, nut changes, it is necessary to ensure load test dress from threaded fastener again
Put, this ensures that load test brings great inconvenience to threaded fastener, and design one kind can adapt to plurality of specifications bolt, nut
Ensure that load test device turns into urgent problem to be solved.
The content of the invention
First technical problem to be solved by this invention be：A kind of threaded fastener is provided and ensures load test device,
The test device is simple in construction, load capability is strong, it is simple to operate can realize reuse, adapt to a variety of big sized bolts or
Nut ensures load test.
Second technical problem to be solved by this invention be：A kind of threaded fastener is provided and ensures load testing method,
This method load mode is simple, load capability is strong, ensures load test suitable for plurality of specifications bolt, nut, is particularly suitable for use in
The big bolt of specification or the guarantee load test of nut.
To solve above-mentioned first technical problem, the technical scheme is that：A kind of threaded fastener ensures that load is surveyed
Trial assembly is put, including pushing tow pre-tightening apparatus, pressure-detecting device, stud, nut to be measured, fastener, the lower end peace of the stud
Loaded on fastener, the nut thread to be measured is installed on the thread segment of stud, positioned at nut to be measured on the stud
Top is set with sleeve, and the lower end of the sleeve contacts cooperation with nut to be measured, and the pushing tow pre-tightening apparatus includes pushing tow pretension
Nut body and the first pad, pushing tow pre-load nut mechanism are installed on the thread segment of stud, and the first pad is sleeved on stud
And between pre-load nut mechanism and sleeve, the pressure-detecting device is installed on stud or sleeve.
As a kind of preferable scheme, the pushing tow pre-load nut mechanism includes pushing tow nut and pushing tow screw, pushing tow spiral shell
Box thread is installed on the thread segment of stud, and the pushing tow screw is circumferential uniform along pushing tow nut and on pushing tow nut,
Pushing tow screw holds out against first pad.
As a kind of preferable scheme, the pressure-detecting device includes foil gauge, foil gauge wire, and the foil gauge glues
It is affixed on stud, the sleeve is sheathed on the outside of foil gauge, and sleeve is provided with metallic channel, and foil gauge wire is drawn from metallic channel
It is connected with deformeter.
As a kind of preferable scheme, the pressure-detecting device is pressure type load sensor, the pressure type load sensing
Device is installed between sleeve and nut to be measured and is connected with dynamometry display instrument.
As a kind of preferable scheme, the sleeve is pressure type load sensor, described in the pressure type load sensor is used as
Pressure-detecting device is connected with dynamometry display instrument.
As a kind of preferable scheme, the second pad is also equipped between the pressure type load sensor and nut to be measured,
The structure of second pad is adapted with nut to be measured.
As a kind of preferable scheme, the stud is studs, and the strain gauge adhesion is in the light bar segment of stud, institute
The lower thread segment that nut thread to be measured is installed on stud is stated, the fastener includes clamp nut mechanism, the 3rd pad, experiment
Platform, the 4th pad, plain nut, the lower thread segment piercing test platform of the stud and pass through clamp nut mechanism, the 3rd pad
Fastened with plain nut, the 4th pad is installed between testing stand and plain nut.
As a kind of preferable scheme, the stud is bolt, and down, the fastener includes on the head of the bolt
Left fixture and right fixture, the clamping die cavity on grip bolt head is separately provided on the left fixture and right fixture, it is described
Left fixture and right fixture are connected with clamping power set respectively.
After employing above-mentioned technical proposal, the beneficial effects of the invention are as follows：During test, pushing tow pre-load nut mechanism produces downwards
The pressure of raw pushing tow, the pressure are transferred to nut to be measured through sleeve, produce stretching to stud, nut to be measured is ensured so as to realize
Load test, in the process, pressure-detecting device detect to the pressure that stud is born, and the pulling force that studs is born is i.e.
The pressure that nut to be measured is born, the jacking force that the pushing tow pre-load nut mechanism of the test device applies is adjustable, can reach in theory
To any jacking force, the problem of conventional method load capability deficiency is efficiently solved, and can realize and a variety of big specifications are treated
The guarantee load test of nut is surveyed, the test device is simple in construction, load capability is strong, easy for installation, simple to operate can realize
Reuse.
Again because the stud is studs, the strain gauge adhesion is in the light bar segment of stud, the nut spiral shell to be measured
Line is installed on the lower thread segment of stud, the fastener include clamp nut mechanism, the 3rd pad, testing stand, the 4th pad,
Plain nut, the lower thread segment piercing test platform of the stud and tight by clamp nut mechanism, the 3rd pad and plain nut
Gu the 4th pad is installed between testing stand and plain nut, this kind of structure is advantageous to threaded fastener and ensures load test dress
Put and be fixed.
Again because the pushing tow pre-load nut mechanism includes pushing tow nut and pushing tow screw, pushing tow nut thread is installed on spiral shell
On the thread segment of post, the pushing tow screw is circumferential uniform along pushing tow nut and on pushing tow nut, and pushing tow screw holds out against institute
The first pad is stated, the pushing tow pressure applied to nut to be measured is uniformly shared by pushing tow screw, so as to ensure that nut stress to be measured
Uniformly, the accuracy for ensureing load test result has been ensured, and the jacking force that each pushing tow screw is received is smaller, and test is steady
It is fixed.
Again due to being also equipped with the second pad between the pressure type load sensor and nut to be measured, second pad
Structure is adapted with nut to be measured, and on the one hand the pad can cause nut stress to be measured to be more uniformly distributed, and ensures load test knot
Fruit more accuracy, pad adaptable therewith on the other hand can be used according to the different shape and structure of nut to be measured, from
And the shape and structure for avoiding nut to be measured the problem of needing when changing to change pressure type load sensor.
To solve above-mentioned second technical problem, the technical scheme is that：A kind of threaded fastener ensures that load is surveyed
Method for testing, comprise the following steps：
1) according to the proof stress of nut to be measured under the respective strengths grade provided in national standard, pushing tow nut and spiral shell are chosen
Post, the strength grade of pushing tow nut and stud is set to be more than the strength grade of nut to be measured；
2) lower end of stud is fixed on testing stand, pressure-detecting device is installed on stud, by nut to be measured, set
Cylinder, the first pad, pushing tow nut are from bottom to top installed on stud, and pushing tow screw is installed on pushing tow nut and pushing tow first
Pad；
3) according to the proof stress of nut to be measured under the respective strengths grade provided in national standard, the reason of nut to be measured is calculated
By load is ensured, in this, as the target load for ensureing load test, the theoretical top that each pushing tow screw needs to provide is calculated
Thrust；
4) jacking force of pushing tow screw is adjusted, reaches theoretical jacking force；
5) real load of nut to be measured, continues to adjust pushing tow screw, when treating when obtaining experiment using pressure-detecting device
When the real load of survey nut reaches target load, 15s is kept；
6) pushing tow screw is shed, whether meets guarantee by the guarantee load test method method detection screw thread pair of national regulations
Loading demands.
As a kind of preferable scheme, the pressure-detecting device is foil gauge or pressure type load sensor；
When pressure-detecting device is foil gauge, it is connected by strain gauge adhesion on stud and with deformeter；
When pressure-detecting device is pressure type load sensor, pressure type load sensor is installed on sleeve and nut to be measured
Between or directly replace sleeve use.
After employing above-mentioned technical proposal, the beneficial effects of the invention are as follows：Because the detection method provides according in national standard
Respective strengths grade under nut to be measured proof stress, calculate the theoretical of nut to be measured and ensure load, in this, as guarantee
The target load of load test, the jacking force that each pushing tow screw needs to provide is calculated, using torque wrench to pushing tow screw
Apply less moment of torsion, it is possible to achieve test required immense pressure, efficiently solve traditional loading method load capability not
The problem of sufficient, ensure that load test provides strong experiment condition for big specification threaded fastener, load mode is simple, loading
Ability is strong.
Because the pressure-detecting device is foil gauge or pressure type load sensor；When pressure-detecting device is foil gauge
When, it is connected by strain gauge adhesion on stud and with deformeter；When pressure-detecting device is pressure type load sensor, pressure type is born
Lotus sensor be installed on sleeve and it is to be measured between or directly replace sleeve use, the pressure-detecting device can according to reality experiment
Situation is selected, and versatility is stronger.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of the embodiment of the present invention 1；
Fig. 2 is the structural representation of the embodiment of the present invention 2；
In accompanying drawing：1. pushing tow screw；2. pushing tow nut；3. the first pad；4. foil gauge；5. sleeve；6. metallic channel；7. treat
Survey nut；8. studs；9. trip bolt；10. clamp nut；11. the 3rd pad；12. testing stand；13. the 4th pad；
14. plain nut；15. the second pad；16. pressure type load sensor；17. bolt；18. left fixture；19. right fixture；20. spiral shell
It is female.
Embodiment
Load test device and test are ensured to a kind of threaded fastener of the present invention below by specific embodiment
Method is described in further detail.
Embodiment 1
As shown in figure 1, a kind of threaded fastener ensures load test device, including pushing tow pre-tightening apparatus, pressure detecting dress
Put, stud, nut to be measured 7, fastener, the lower end of the stud is installed on fastener, the screw thread of nut 7 peace to be measured
On thread segment loaded on stud, the top on the stud positioned at nut 7 to be measured is set with sleeve 5, the lower end of the sleeve 5 with
Nut 7 to be measured contacts cooperation, and the pushing tow pre-tightening apparatus includes pushing tow pre-load nut mechanism and the first pad 3, pushing tow pretension spiral shell
Parent agency is installed on the thread segment of stud, the first pad 3 be sleeved on stud and positioned at pre-load nut mechanism and sleeve 5 it
Between, the pressure-detecting device is installed on stud or sleeve 5.
In the present embodiment, the pushing tow pre-load nut mechanism includes pushing tow nut 2 and pushing tow screw 1, the screw thread of pushing tow nut 2
It is installed on the thread segment of stud, the pushing tow screw 1 is circumferential uniform along pushing tow nut 2 and on pushing tow nut 2, pushing tow
Screw 1 holds out against first pad 3, and pressure-detecting device includes foil gauge 4, the wire of foil gauge 4, and the foil gauge 4 is pasted on
On stud, the sleeve 5 is sheathed on the outside of foil gauge 4, and sleeve 5 is provided with metallic channel 6, and the wire of foil gauge 4 draws from metallic channel 6
Go out and be connected with deformeter.
Certainly, the pressure-detecting device can also be pressure type load sensor 16, and the pressure type load sensor 16 is pacified
Loaded on being connected between sleeve 5 and nut to be measured 7 and with dynamometry display instrument.The pressure-detecting device can also have the third knot
Structure, i.e. sleeve 5 are pressure type load sensor 16, and the pressure type load sensor 16 is shown as the pressure-detecting device with dynamometry
Instrument connects.
The second pad 15, second pad 15 are also equipped between the pressure type load sensor 16 and nut to be measured 7
Structure and nut 7 to be measured be adapted, can be only by changing the second pad when structure, the shape of nut 7 to be measured change
Piece 15, the guarantee load test to nut 7 to be measured is realized, without a whole set of test device is replaced.
Wherein described stud can be studs 8, and the foil gauge 4 is pasted on the light bar segment of stud, the nut 7 to be measured
Screw thread is installed on the lower thread segment of stud, and the fastener includes clamp nut mechanism, the 3rd pad 11, testing stand 12, the
Four pads 13, plain nut 14, the lower thread segment piercing test platform 12 of the stud and pass through clamp nut mechanism, the 3rd pad
11 and plain nut 14 fasten, the 4th pad 13 is installed between testing stand 12 and plain nut 14.The clamp nut mechanism
Including clamp nut 10 and trip bolt 9, the trip bolt 9 is circumferential uniform along clamp nut 10 and is arranged on clamp nut 10
On, the plain nut 14 is conventional hexagonal nut, and nut 7 to be measured and clamp nut 10 are round nut, the inwall of sleeve 5
Gap be present between the screw thread of studs 8, ensure to do between loading procedure middle sleeve 5 and studs 8
Disturb so that test result is more accurate.
During test, each pushing tow screw 1 is tightened so that pushing tow nut 2 produces downwards the pressure of pushing tow, and the pressure is through sleeve
5 are transferred to nut 7 to be measured, ensure load test to nut 7 to be measured so as to realize, in the process, pressure-detecting device is treated
Survey the pressure that nut 7 is born to be detected, observe the pressure that nut 7 to be measured is born, the pushing tow pretension spiral shell of the test device at any time
The jacking force that parent agency applies is adjustable, can reach any jacking force in theory, efficiently solve conventional method load capability not
The problem of foot, and the jacking force that pushing tow pre-load nut mechanism applies is adjustable, it is possible to achieve to a variety of big specification nuts 7 to be measured
Ensure load test, the test device is simple in construction, load capability is strong, easy for installation, simple to operate can realize reuse.
The test device can both be used for detecting the guarantee load of nut, can be used for detecting the guarantee load of stud again.
When test object is nut, the intensity for the other structures that the test device includes in addition to nut 7 to be measured all should be more than or equal to
45HRC；When test object is stud, the intensity for the other structures that the test device includes in addition to stud to be measured should be greater than
Equal to 45HRC.
A kind of threaded fastener ensures load testing method, comprises the following steps：
1) according to the proof stress of nut 7 to be measured under the respective strengths grade provided in national standard, pushing tow nut 2 and spiral shell are chosen
Post, the strength grade of pushing tow nut 2 and stud is set to be more than the strength grade of nut 7 to be measured, if to be measured for bolt, then pushing tow
Nut 2 and nut strength grade are more than the strength grade of bolt to be measured；
2) lower end of stud is fixed on testing stand 12, pressure-detecting device is installed on stud, by nut to be measured
7th, sleeve 5, the first pad 3, pushing tow nut 2 are from bottom to top installed on stud, and pushing tow screw 1 is installed on pushing tow nut 2
And the first pad of pushing tow 3；
3) according to the proof stress of nut 7 to be measured under the respective strengths grade provided in national standard, nut 7 to be measured is calculated
Theory ensures load, in this, as the target load for ensureing load test, calculates the theory that each pushing tow screw 1 needs to provide
Jacking force；
4) jacking force of pushing tow screw 1 is adjusted, reaches theoretical jacking force；
5) real load of nut 7 to be measured when obtaining testing using pressure-detecting device, continue to adjust pushing tow screw 1, when
When the real load of nut 7 to be measured reaches target load, 15s is kept；
6) pushing tow screw 1 is shed, whether meets guarantor by the guarantee load test method method detection screw thread pair of national regulations
Demonstrate,prove loading demands.
The pressure-detecting device is foil gauge 4 or pressure type load sensor 16；
In the present embodiment, pressure-detecting device is foil gauge 4, and foil gauge 4 is pasted onto on stud and is connected with deformeter.
Stud thread segment insertion testing stand 12 insertion depth determined by the height of clamp nut 10 and plain nut 14, the strain
The full-bridge method of piece 4 is pasted on the light bar segment of studs 8, and the pushing tow screw 1 uses the firmly beforehand meanses of right-angled intersection when mounted,
The firmly beforehand meanses of so-called right-angled intersection just refer to install pushing tow screw 1 successively in a manner of cruciform symmetry, and control pushing tow screw 1 is every
The loading amplitude of one step, to ensure nut 7 to be measured during the pretension of pushing tow screw 1, ensure load test accuracy and
Stability.The pushing tow screw 1 also uses the firmly beforehand meanses of right-angled intersection in unloading, to ensure nut 7 to be measured in unloading
It will not be destroyed.
In step 6), whether detection screw thread pair, which meets, ensures that the detection of loading demands has two kinds of situations：When to be measured is
During nut, if can directly be screwed out nut 7 to be measured with hand, the nut 7 to be measured ensures that load is qualified, or when can not with hand
When nut to be measured is screwed out, nut 7 to be measured is unclamped by spanner, but must not exceed half button, then the nut 7 to be measured ensures load still
It is qualified, it is otherwise unqualified.When part to be measured is bolt, the length of bolt 17 to be measured, spiral shell to be measured before test before and after measurement test
The tolerance of the length of bolt 17 to be measured is qualified in ± 12.5um after the length of bolt 17 and test.
The detection method is calculated and treated according to the proof stress of nut 7 to be measured under the respective strengths grade provided in national standard
Survey the theoretical of nut 7 and ensure load, in this, as the target load for ensureing load test, calculating each pushing tow screw 1 needs
The jacking force of offer, less moment of torsion is applied to pushing tow screw 1 using torque wrench, it is possible to achieve test required huge pressure
Power, traditional loading method load capability deficiency is solve thed problems, such as, ensure that load test carries for big specification threaded fastener
Strong experiment condition is supplied, load mode is simple, load capability is strong.The method of testing can both be used for detecting the guarantee of nut
Load, it can be used for detecting the guarantee load of stud again.
Embodiment 2
As shown in Fig. 2 a kind of threaded fastener ensures in load test device, the stud is bolt 17, the present embodiment
Middle tested part is bolt 17, then down, screw thread is provided with nut 20 on bolt 17 on the head of the bolt 17, implements certainly
Even if tested part is nut in example 1, stud can be still changed into bolt 17, and fixed with the fixed form in the embodiment
Bolt.The fastener includes left fixture 18 and right fixture 19, and use is respectively arranged with the left fixture 18 and right fixture 19
Clamping die cavity in the head of grip bolt 17, the left fixture 18 and right fixture 19 are connected with clamping power set, clamped respectively
Power set can be oil cylinder.
In the present embodiment, sleeve 5 is pressure type load sensor 16, and the pressure type load sensor 16 is used as the pressure detecting
Device is connected with dynamometry display instrument.The pressure-detecting device can also be pressure type load sensor 16, and the pressure type load passes
Sensor 16 is installed between sleeve 5 and nut to be measured 7 and is connected with dynamometry display instrument.
A kind of threaded fastener of the present embodiment ensures in load test device, in addition to said structure is different from embodiment 1,
Other are same as Example 1.A kind of threaded fastener ensures in load testing method that pressure-detecting device passes for pressure type load
Sensor 16, directly to replace sleeve 5 and use, the pressure type load sensor 16 is installed between the first pad 3 and the second pad 15,
The method of testing of the present embodiment, in addition to pressure-detecting device is different from embodiment 1, other are same as Example 1.Certainly, press
Formula load sensor 16 can also be installed between sleeve 5 and nut to be measured 7.
The test device and method of testing can not only be applicable the guarantee load test of threaded fastener, but also can use
In other pressure tests, such as when sleeve 5 is part to be measured, sleeve 5 can be carried out with same method in the same configuration
Be pressurized test.
By taking pitch P=3mm as an example, the external screw thread of all size ensures load such as following table under different performance grade.
The tensile load limit that the tensile testing machine of current most of testing agency can be provided is 2.94 × 106N
(300t), it is directed to and ensures load 2.94 × 106More than N (300t) big sized bolt, nut are also without complete experiment
Condition, provide in GB/T 3098 and ensure that the bolt and nut maximum specification of load is M39, is more than 39mm, especially for diameter
More than M64 big sized bolt, nut, still without complete experiment condition, so the guarantee load of big sized bolt, nut is surveyed
Examination is all the technical barrier in terms of fastener performance test all the time.
Consider from technical standpoint, the experimental rig in the present invention uses pushing tow pretension load mode, the matching used load of institute
Load testing device is pressure type load sensor or foil gauge, compared to traditional tensile testing machine, the exclusive loading of the present invention
Mode, its load capability can meet the guarantee load test experiment of big sized bolt nut, and matching used pressure type completely
Load sensor is customizable element, and state's inner sensor manufactures the pressure type load sensor of R ＆ D Enterprises production, its maximum range
3000-4000 tons are can reach, so this set experimental rig has enough load capability and power of test.For requiring test volume
Larger, repeated higher testing experiment, pressure type load sensor can be selected as measuring cell, it is smaller for test volume, be
Experimentation cost is reduced, foil gauge can be selected as measuring cell, deformeter is connected, using stress-strain measurement method.
Consider from economic and practical angle, the price of a wide range pressure type load sensor just corresponds to 30 tons of drawings
Force tester is even lower, and the price of tensile testing machine domestic one 300 tons at present is just sufficiently expensive, so of the invention
Guarantee load test experiment for big sized bolt nut has very high applicability and economy.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (2)
1. a kind of threaded fastener ensures load testing method, comprise the following steps：
1) according to the proof stress of nut to be measured under the respective strengths grade provided in national standard, pushing tow nut and stud is chosen, is made
The strength grade of pushing tow nut and stud is more than the strength grade of nut to be measured；
2) lower end of stud is fixed on testing stand, pressure-detecting device is installed on stud, by nut to be measured, sleeve,
First pad, pushing tow nut are from bottom to top installed on stud, and pushing tow screw is installed on pushing tow nut and pushing tow first pads
Piece；
3) according to the proof stress of nut to be measured under the respective strengths grade provided in national standard, calculate the theoretical of nut to be measured and protect
Load is demonstrate,proved, in this, as the target load for ensureing load test, calculates the theoretical jacking force that each pushing tow screw needs to provide；
4) jacking force of pushing tow screw is adjusted, reaches theoretical jacking force；
5) real load of nut to be measured when obtaining testing using pressure-detecting device, continue to adjust pushing tow screw, when spiral shell to be measured
When female real load reaches target load, 15s is kept；
6) pushing tow screw is shed, whether meets guarantee load by the guarantee load test method method detection screw thread pair of national regulations
It is required that.
2. a kind of threaded fastener ensures load testing method as claimed in claim 1, it is characterised in that：The pressure detecting dress
It is set to foil gauge or pressure type load sensor；
When pressure-detecting device is foil gauge, it is connected by strain gauge adhesion on stud and with deformeter；
When pressure-detecting device is pressure type load sensor, pressure type load sensor is installed between sleeve and nut to be measured
Or directly replace sleeve and use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003529.XA CN105424481B (en) | 2015-12-28 | 2015-12-28 | A kind of threaded fastener ensures load test device and method of testing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511003529.XA CN105424481B (en) | 2015-12-28 | 2015-12-28 | A kind of threaded fastener ensures load test device and method of testing |
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| Publication Number | Publication Date |
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| CN105424481A CN105424481A (en) | 2016-03-23 |
| CN105424481B true CN105424481B (en) | 2017-11-24 |
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| CN109139654A (en) * | 2018-10-10 | 2019-01-04 | 中国商用飞机有限责任公司 | The non-standard bolt of load detection device can directly be installed additional |
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