CN105424481A - Threaded fastener guarantee load testing apparatus and testing method thereof - Google Patents
Threaded fastener guarantee load testing apparatus and testing method thereof Download PDFInfo
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- CN105424481A CN105424481A CN201511003529.XA CN201511003529A CN105424481A CN 105424481 A CN105424481 A CN 105424481A CN 201511003529 A CN201511003529 A CN 201511003529A CN 105424481 A CN105424481 A CN 105424481A
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- 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 threaded fastener guarantee load testing apparatus. The apparatus comprises a pushing preload device, a pressure detection device, a stud, a nut to be detected and a fastening device, the lower end of the stud is arranged on the fastening device, the nut to be detected in threaded on the threaded segment of the stud, and a position on the stud above the nut to be detected is sleeved with a sleeve, the lower end of the sleeve is in top contact fit with the nut to be detected, the pushing preload device comprises a pushing preload nut mechanism and a first pad, the pushing preload nut mechanism is arranged on the threaded segment of the stud, the first pad is sleeved on the stud and is positioned between the preload nut mechanism and the sleeve, and the pressure detection device is arranged on the stud or the sleeve. The testing apparatus has the advantages of simple structure, strong loading capability, simple operation, repeated use realization, and adaption to multiple large-specification bolt or nut guarantee load tests. The invention also discloses a threaded fastener guarantee load testing method. The method is especially suitable for the large-specification bolt or nut guarantee load tests.
Description
Technical field
The present invention relates to a kind of threaded fastener and ensure load test device and method of testing.
Background technology
Threaded fastener ensure that load detects the important indicator of threaded fastener mechanical property, along with the development that the field devices such as oil refining, chemical industry and nuclear power maximize, require that pressure vessel runs at high temperature under high pressure, like this, bolt required on equipment, the also corresponding increase of nut diameter, for ensureing the reliability that connects and security, the requirement of the load test that needs all to give one's hand to bolt, nut.
The tensile load limit that the tension tester of current most of testing agency can provide is 2.94 × 10
6n (300t), is directed to and ensures that load is 2.94 × 10
6large gauge bolt, the nut of more than N (300t) also do not have complete experiment condition, especially diameter is greater than to large gauge bolt, the nut of more than 39mm, still there is no complete experiment condition, so the guarantee load test of large gauge bolt, nut is all the technical barrier of securing member performance test aspect all the time.In addition, traditional threaded fastener ensures that the proving installation of load is all only can carry out guarantee load test for the bolt of certain specific standard, nut, when the specification of bolt to be measured, nut changes, just need again to select threaded fastener to ensure load test device, to threaded fastener, this ensures that load test brings great inconvenience, design one can adapt to plurality of specifications bolt, nut ensures that load test device becomes problem demanding prompt solution.
Summary of the invention
First technical matters to be solved by this invention is: provide a kind of threaded fastener to ensure load test device, this proving installation structure is simple, load capability is strong, simple to operate can realization is reused, and can adapt to multiple large gauge bolt or nut guarantee load test.
Second technical matters to be solved by this invention is: provide a kind of threaded fastener to ensure load testing method, the method load mode is simple, load capability is strong, be applicable to plurality of specifications bolt, nut ensures load test, be particularly useful for the bolt of large gauge or the guarantee load test of nut.
For solving above-mentioned first technical matters, technical scheme of the present invention is: a kind of threaded fastener ensures load test device, comprise pushing tow pre-tightening apparatus, pressure-detecting device, stud, nut to be measured, fastener, the lower end of described stud is installed on fastener, described nut thread to be measured is installed on the thread segment of stud, the top described stud being positioned at nut to be measured is set with sleeve, the lower end of described sleeve contacts with nut to be measured and coordinates, described pushing tow pre-tightening apparatus comprises 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 to be sleeved on stud and between pre-load nut mechanism and sleeve, described pressure-detecting device is installed on stud or sleeve.
As the preferred scheme of one, described pushing tow pre-load nut mechanism comprises pushing tow nut and pushing tow screw, pushing tow nut thread is installed on the thread segment of stud, and described pushing tow screw is uniform and be arranged on pushing tow nut along pushing tow nut circumference, and pushing tow screw holds out against described first pad.
As the preferred scheme of one, described pressure-detecting device comprises foil gauge, foil gauge wire, and described strain gauge adhesion is on stud, and described jacket casing is located at the outside of foil gauge, sleeve is provided with metallic channel, and foil gauge wire is drawn from metallic channel and is connected with strainmeter.
As the preferred scheme of one, described pressure-detecting device is pressure type load sensor, and described pressure type load sensor to be installed between sleeve and nut to be measured and to be connected with dynamometry display instrument.
As the preferred scheme of one, described sleeve is pressure type load sensor, and this pressure type load sensor is connected with dynamometry display instrument as described pressure-detecting device.
As the preferred scheme of one, be also provided with the second pad between described pressure type load sensor and nut to be measured, structure and the nut to be measured of described second pad adapt.
As the preferred scheme of one, described stud is studs, described strain gauge adhesion is in the polished rod section of stud, described nut thread to be measured is installed on the lower thread segment of stud, described fastener comprises clamp nut mechanism, the 3rd pad, testing table, the 4th pad, plain nut, the lower thread segment piercing test platform of described stud and fastening by clamp nut mechanism, the 3rd pad and plain nut, the 4th pad is installed between testing table and plain nut.
As the preferred scheme of one, described stud is bolt, the head of described bolt down, described fastener comprises left fixture and right fixture, described left fixture and right fixture are respectively arranged with the clamping die cavity for grip bolt head, described left fixture and right fixture are connected with clamping propulsion system respectively.
After have employed technique scheme, the invention has the beneficial effects as follows: during test, pushing tow pre-load nut mechanism produces the pressure of pushing tow downwards, this pressure is passed to nut to be measured through sleeve, stud is produced and stretches, thus realize ensureing load test to nut to be measured, in the process, pressure-detecting device detects the pressure that stud bears, the pulling force that studs bears and the pressure that nut to be measured bears, the jacking force that the pushing tow pre-load nut mechanism of this proving installation applies is adjustable, any jacking force can be reached in theory, efficiently solve a difficult problem for classic method load capability deficiency, and the guarantee load test that can realize multiple large gauge nut to be measured, this proving installation structure is simple, load capability is strong, easy for installation, simple to operate can realization is reused.
Again because described stud is studs, described strain gauge adhesion is in the polished rod section of stud, described nut thread to be measured is installed on the lower thread segment of stud, described fastener comprises clamp nut mechanism, the 3rd pad, testing table, the 4th pad, plain nut, the lower thread segment piercing test platform of described stud and fastening by clamp nut mechanism, the 3rd pad and plain nut, 4th pad is installed between testing table and plain nut, and this kind of structure is conducive to threaded fastener and ensures that load test device is fixed.
Again because described pushing tow pre-load nut mechanism comprises pushing tow nut and pushing tow screw, pushing tow nut thread is installed on the thread segment of stud, described pushing tow screw is uniform and be arranged on pushing tow nut along pushing tow nut circumference, pushing tow screw holds out against described first pad, the pushing tow pressure that nut to be measured applies evenly is shared by pushing tow screw, thus ensure that nut uniform force to be measured, ensure the accuracy ensureing load test result, and the jacking force that each pushing tow screw receives is less, stable testing.
Again owing to being also provided with the second pad between described pressure type load sensor and nut to be measured, structure and the nut to be measured of described second pad adapt, this pad can make nut to be measured stressed more even on the one hand, ensure load test result more accuracy, can use according to the difformity of nut to be measured and structure the pad adapted with it on the other hand, thus when the shape and structure avoiding nut to be measured changes, need the problem changing pressure type load sensor.
For solving above-mentioned second technical matters, technical scheme of the present invention is: a kind of threaded fastener ensures load testing method, comprises the following steps:
1) according to the proof stress of nut to be measured under the respective strengths grade provided in GB, choose pushing tow nut and stud, make the strength grade of pushing tow nut and stud be greater than the strength grade of nut to be measured;
2) lower end of stud is fixed on testing table, pressure-detecting device is installed on stud, nut to be measured, sleeve, the first pad, pushing tow nut are from bottom to top installed on stud, pushing tow screw to be 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 GB, the theory calculating nut to be measured ensures load, in this, as the target load ensureing load test, calculates the theoretical jacking force that each pushing tow screw needs to provide;
4) regulate the jacking force of pushing tow screw, make it reach theoretical jacking force;
5) when utilizing pressure-detecting device to obtain testing, the real load of nut to be measured, continues to regulate pushing tow screw, when the real load of nut to be measured reaches target load, keeps 15s;
6) shed pushing tow screw, detect screw thread pair by the guarantee load test method method of national regulations and whether meet guarantee loading demands.
As the preferred scheme of one, described pressure-detecting device is foil gauge or pressure type load sensor;
When pressure-detecting device is foil gauge, strain gauge adhesion is connected with strainmeter on stud;
When pressure-detecting device is pressure type load sensor, pressure type load sensor is installed between sleeve and nut to be measured or directly replaces sleeve use.
After have employed technique scheme, the invention has the beneficial effects as follows: because this detection method is according to the proof stress of nut to be measured under the respective strengths grade provided in GB, the theory calculating nut to be measured ensures load, in this, as the target load ensureing load test, calculate the jacking force that each pushing tow screw needs to provide, dial torque wrench is utilized to apply less moment of torsion to pushing tow screw, the immense pressure required for testing can be realized, efficiently solve the problem of traditional loading method load capability deficiency, for large gauge threaded fastener ensures that load test provides strong experiment condition, load mode is simple, load capability is strong.
Because described pressure-detecting device is foil gauge or pressure type load sensor; When pressure-detecting device is foil gauge, strain gauge adhesion is connected with strainmeter on stud; When pressure-detecting device is pressure type load sensor, pressure type load sensor is installed on sleeve and to be measured between or directly replace sleeve and use, this pressure-detecting device can be selected according to the test situation of reality, and versatility is stronger.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
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. nut to be measured; 8. studs; 9. trip bolt; 10. clamp nut; 11. the 3rd pads; 12. testing tables; 13. the 4th pads; 14. plain nuts; 15. second pads; 16. pressure type load sensors; 17. bolts; 18. left fixtures; 19. right fixtures; 20. nuts.
Embodiment
Below by specific embodiment, a kind of threaded fastener of the present invention is ensured that load test device and method of testing are described in further detail.
Embodiment 1
As shown in Figure 1, a kind of threaded fastener ensures load test device, comprise pushing tow pre-tightening apparatus, pressure-detecting device, stud, nut 7 to be measured, fastener, the lower end of described stud is installed on fastener, described nut to be measured 7 screw thread is installed on the thread segment of stud, the top described stud being positioned at nut 7 to be measured is set with sleeve 5, the lower end of described sleeve 5 contacts with nut 7 to be measured and coordinates, described pushing tow pre-tightening apparatus comprises pushing tow pre-load nut mechanism and the first pad 3, pushing tow pre-load nut mechanism is installed on the thread segment of stud, first pad 3 to be sleeved on stud and between pre-load nut mechanism and sleeve 5, described pressure-detecting device is installed on stud or sleeve 5.
In the present embodiment, described pushing tow pre-load nut mechanism comprises pushing tow nut 2 and pushing tow screw 1, pushing tow nut 2 screw thread is installed on the thread segment of stud, described pushing tow screw 1 is uniform and be arranged on pushing tow nut 2 along pushing tow nut 2 circumference, pushing tow screw 1 holds out against described first pad 3, pressure-detecting device comprises foil gauge 4, foil gauge 4 wire, described foil gauge 4 is pasted on stud, described sleeve 5 is sheathed on the outside of foil gauge 4, sleeve 5 is provided with metallic channel 6, and foil gauge 4 wire is drawn from metallic channel 6 and is connected with strainmeter.
Certainly, described pressure-detecting device can also be pressure type load sensor 16, and described pressure type load sensor 16 to be installed between sleeve 5 and nut to be measured 7 and to be connected with dynamometry display instrument.Described pressure-detecting device can also have the third structure, and namely sleeve 5 is pressure type load sensor 16, and this pressure type load sensor 16 is connected with dynamometry display instrument as described pressure-detecting device.
Second pad 15 is also installed between described pressure type load sensor 16 and nut to be measured 7, structure and the nut to be measured 7 of described second pad 15 adapt, when the structure of nut 7 to be measured, shape change, can only by change second pad 15, realize the guarantee load test to nut 7 to be measured, and without the need to a whole set of proving installation is replaced.
Wherein said stud can be studs 8, described foil gauge 4 is pasted on the polished rod section of stud, described nut to be measured 7 screw thread is installed on the lower thread segment of stud, described fastener comprises clamp nut mechanism, the 3rd pad 11, testing table 12, the 4th pad 13, plain nut 14, the lower thread segment piercing test platform 12 of described stud and fastening by clamp nut mechanism, the 3rd pad 11 and plain nut 14, the 4th pad 13 is installed between testing table 12 and plain nut 14.Described clamp nut mechanism comprises clamp nut 10 and trip bolt 9, described trip bolt 9 is uniform and be arranged on clamp nut 10 along clamp nut 10 circumference, described plain nut 14 is conventional hexagonal nut, nut 7 to be measured is round nut with clamp nut 10, gap is there is between described sleeve 5 inwall and the screw thread of studs 8, ensure can not disturb between loading procedure middle sleeve 5 and studs 8, make test result more accurate.
During test, tighten each pushing tow screw 1, pushing tow nut 2 is made to produce the pressure of pushing tow downwards, this pressure is passed to nut 7 to be measured through sleeve 5, thus realize ensureing load test to nut 7 to be measured, in the process, pressure-detecting device detects the pressure that nut 7 to be measured bears, observe the pressure that nut 7 to be measured bears at any time, the jacking force that the pushing tow pre-load nut mechanism of this proving installation applies is adjustable, any jacking force can be reached in theory, efficiently solve a difficult problem for classic method load capability deficiency, and the jacking force that pushing tow pre-load nut mechanism applies is adjustable, the guarantee load test to multiple large gauge nut 7 to be measured can be realized, this proving installation structure is simple, load capability is strong, easy for installation, simple to operate can realization is reused.
This proving installation both can be used for detecting the guarantee load of nut, can be used for again detecting the guarantee load of stud.When tested object is nut, the intensity of other structures that this proving installation comprises except nut 7 to be measured all should be more than or equal to 45HRC; When tested object is stud, the intensity of other structures that this proving installation comprises except stud to be measured all should be more than or 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 GB, choose pushing tow nut 2 and stud, the strength grade of pushing tow nut 2 and stud is made to be greater than the strength grade of nut 7 to be measured, if to be measured is bolt, so pushing tow nut 2 and nut strength grade are greater than the strength grade of bolt to be measured;
2) lower end of stud is fixed on testing table 12, pressure-detecting device is installed on stud, nut 7 to be measured, sleeve 5, first pad 3, pushing tow nut 2 are from bottom to top installed on stud, pushing tow screw 1 are installed on pushing tow nut 2 and pushing tow first pad 3;
3) according to the proof stress of nut 7 to be measured under the respective strengths grade provided in GB, the theory calculating nut 7 to be measured ensures load, in this, as the target load ensureing load test, calculates the theoretical jacking force that each pushing tow screw 1 needs to provide;
4) regulate the jacking force of pushing tow screw 1, make it reach theoretical jacking force;
5) when utilizing pressure-detecting device to obtain testing, the real load of nut 7 to be measured, continues to regulate pushing tow screw 1, when the real load of nut 7 to be measured reaches target load, keeps 15s;
6) shed pushing tow screw 1, detect screw thread pair by the guarantee load test method method of national regulations and whether meet guarantee loading demands.
Described pressure-detecting device is foil gauge 4 or pressure type load sensor 16;
In the present embodiment, pressure-detecting device is foil gauge 4, to be pasted onto by foil gauge 4 on stud and to be connected with strainmeter.The insertion depth of the thread segment insertion testing table 12 of stud is determined by the height of clamp nut 10 and plain nut 14, described foil gauge 4 full-bridge method is pasted on the polished rod section of studs 8, described pushing tow screw 1 adopts the firmly beforehand means of right-angled intersection when mounted, the firmly beforehand means of so-called right-angled intersection just refers to installs pushing tow screw 1 successively in the mode of cruciform symmetry, control the loading amplitude of each step of pushing tow screw 1, to ensure that nut 7 to be measured is in the pretension process of pushing tow screw 1, ensure the Stability and veracity of load test.Described pushing tow screw 1 also adopts the firmly beforehand means of right-angled intersection when unloading, to ensure that nut 7 to be measured can not be destroyed in unloading.
In step 6) in, detect screw thread pair whether to meet and ensure that the detection of loading demands has two kinds of situations: when to be measured for nut time, if directly nut 7 to be measured can be screwed out with hand, then this nut 7 to be measured ensures that load is qualified, or when nut to be measured being screwed out with hand, unclamp nut 7 to be measured by spanner, but must not more than half button, then this nut 7 to be measured ensures that load is still qualified, otherwise defective.When part to be measured is bolt, measure the length of bolt 17 to be measured before and after test, before test bolt 17 to be measured length and test after bolt 17 to be measured length tolerance ± 12.5um is qualified.
This detection method is according to the proof stress of nut 7 to be measured under the respective strengths grade provided in GB, the theory calculating nut 7 to be measured ensures load, in this, as the target load ensureing load test, calculate the jacking force that each pushing tow screw 1 needs to provide, dial torque wrench is utilized to apply less moment of torsion to pushing tow screw 1, the immense pressure required for testing can be realized, efficiently solve the problem of traditional loading method load capability deficiency, for large gauge threaded fastener ensures that load test provides strong experiment condition, load mode is simple, load capability is strong.This method of testing both can be used for detecting the guarantee load of nut, can be used for again detecting the guarantee load of stud.
Embodiment 2
As shown in Figure 2, a kind of threaded fastener ensures in load test device, described stud is bolt 17, in the present embodiment, tested part is bolt 17, down, on bolt 17, screw thread is provided with nut 20 to the head of so described bolt 17, even if tested part is nut in certain embodiment 1, still stud can be become bolt 17, and with the fixed form set bolt in this embodiment.Described fastener comprises left fixture 18 and right fixture 19, described left fixture 18 and right fixture 19 are respectively arranged with the clamping die cavity for grip bolt 17 head, described left fixture 18 and right fixture 19 are connected with clamping propulsion system respectively, and clamping propulsion system can be oil cylinder.
In the present embodiment, sleeve 5 is pressure type load sensor 16, and this pressure type load sensor 16 is connected with dynamometry display instrument as described pressure-detecting device.Described pressure-detecting device can also be pressure type load sensor 16, and described pressure type load sensor 16 to be installed between sleeve 5 and nut to be measured 7 and to be connected with dynamometry display instrument.
A kind of threaded fastener of the present embodiment ensures that in load test device, except said structure is different from embodiment 1, other are all identical with embodiment 1.A kind of threaded fastener ensures in load testing method, pressure-detecting device is pressure type load sensor 16, direct replacement sleeve 5 uses, described 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, except pressure-detecting device is different from embodiment 1, other are all identical with embodiment 1.Certainly, pressure type load sensor 16 can also be installed between sleeve 5 and nut to be measured 7.
This proving installation and method of testing not only can be suitable for the guarantee load test of threaded fastener, but also may be used for other pressure tests, such as, when sleeve 5 is to be measured, can carry out pressurized test with same structure and same method to sleeve 5.
For pitch P=3mm, under different performance grade, the external thread of all size ensures that load is as following table.
The tensile load limit that the tension tester of current most of testing agency can provide is 2.94 × 10
6n (300t), is directed to and ensures that load is 2.94 × 10
6large gauge bolt, the nut of more than N (300t) also do not have complete experiment condition, providing the bolt and nut maximum specification ensureing load in GB/T3098 is M39,39mm is greater than for diameter, especially large gauge bolt, the nut of more than M64, still there is no complete experiment condition, so the guarantee load test of large gauge bolt, nut is all the technical barrier of securing member performance test aspect all the time.
Consider from technical standpoint, test unit in the present invention adopts pushing tow pretension load mode, matching used load test device is pressure type load sensor or foil gauge, compared to traditional tension tester, the load mode that the present invention is exclusive, its load capability can meet the guarantee load test test of large gauge bolt and nut completely, and matching used pressure type load sensor is customizable element, state's inner sensor manufactures the pressure type load sensor that R & D Enterprises is produced, its maximum range can reach 3000-4000 ton, so this cover test unit has enough load capabilities and power of test.For the testing experiment requiring that test volume is comparatively large, repeatability is higher, pressure type load sensor can be selected as measuring sensor, less for test volume, for reducing experimentation cost, foil gauge can be selected as measuring sensor, connect strainmeter, adopt stress-strain measurement method.
Consider from economic and practical angle, it is even lower that the price of a wide range pressure type load sensor is only equivalent to 30 tons of tension testers, and the price of tension tester of domestic 300 tons is just very expensive at present, so the present invention has very high applicability and economy for the guarantee load test test of large gauge bolt and nut.
The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a threaded fastener ensures load test device, it is characterized in that: comprise pushing tow pre-tightening apparatus, pressure-detecting device, stud, nut to be measured, fastener, the lower end of described stud is installed on fastener, described nut thread to be measured is installed on the thread segment of stud, the top described stud being positioned at nut to be measured is set with sleeve, the lower end of described sleeve contacts with nut to be measured and coordinates, described pushing tow pre-tightening apparatus comprises 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 to be sleeved on stud and between pre-load nut mechanism and sleeve, described pressure-detecting device is installed on stud or sleeve.
2. a kind of threaded fastener ensures load test device as claimed in claim 1, it is characterized in that: described pushing tow pre-load nut mechanism comprises pushing tow nut and pushing tow screw, pushing tow nut thread is installed on the thread segment of stud, described pushing tow screw is uniform and be arranged on pushing tow nut along pushing tow nut circumference, and pushing tow screw holds out against described first pad.
3. a kind of threaded fastener ensures load test device as claimed in claim 2, it is characterized in that: described pressure-detecting device comprises foil gauge, foil gauge wire, described strain gauge adhesion is on stud, described jacket casing is located at the outside of foil gauge, sleeve is provided with metallic channel, and foil gauge wire is drawn from metallic channel and is connected with strainmeter.
4. a kind of threaded fastener ensures load test device as claimed in claim 2, it is characterized in that: described pressure-detecting device is pressure type load sensor, and described pressure type load sensor to be installed between sleeve and nut to be measured and to be connected with dynamometry display instrument.
5. a kind of threaded fastener ensures load test device as claimed in claim 2, and it is characterized in that: described sleeve is pressure type load sensor, this pressure type load sensor is connected with dynamometry display instrument as described pressure-detecting device.
6. a kind of threaded fastener ensures load test device as claimed in claim 5, and it is characterized in that: be also provided with the second pad between described pressure type load sensor and nut to be measured, structure and the nut to be measured of described second pad adapt.
7. as described in any one of claim 1 to 6, a kind of threaded fastener ensures load test device, it is characterized in that: described stud is studs, described strain gauge adhesion is in the polished rod section of stud, described nut thread to be measured is installed on the lower thread segment of stud, described fastener comprises clamp nut mechanism, the 3rd pad, testing table, the 4th pad, plain nut, the lower thread segment piercing test platform of described stud and fastening by clamp nut mechanism, the 3rd pad and plain nut, the 4th pad is installed between testing table and plain nut.
8. as described in any one of claim 1 to 6, a kind of threaded fastener ensures load test device, it is characterized in that: described stud is bolt, the head of described bolt down, described fastener comprises left fixture and right fixture, described left fixture and right fixture are respectively arranged with the clamping die cavity for grip bolt head, described left fixture and right fixture are connected with clamping propulsion system respectively.
9. threaded fastener ensures a load testing method, comprises the following steps:
1) according to the proof stress of nut to be measured under the respective strengths grade provided in GB, choose pushing tow nut and stud, make the strength grade of pushing tow nut and stud be greater than the strength grade of nut to be measured;
2) lower end of stud is fixed on testing table, pressure-detecting device is installed on stud, nut to be measured, sleeve, the first pad, pushing tow nut are from bottom to top installed on stud, pushing tow screw to be 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 GB, the theory calculating nut to be measured ensures load, in this, as the target load ensureing load test, calculates the theoretical jacking force that each pushing tow screw needs to provide;
4) regulate the jacking force of pushing tow screw, make it reach theoretical jacking force;
5) when utilizing pressure-detecting device to obtain testing, the real load of nut to be measured, continues to regulate pushing tow screw, when the real load of nut to be measured reaches target load, keeps 15s;
6) shed pushing tow screw, detect screw thread pair by the guarantee load test method method of national regulations and whether meet guarantee loading demands.
10. a kind of threaded fastener ensures load testing method as claimed in claim 9, it is characterized in that: described pressure-detecting device is foil gauge or pressure type load sensor;
When pressure-detecting device is foil gauge, strain gauge adhesion is connected with strainmeter on stud;
When pressure-detecting device is pressure type load sensor, pressure type load sensor is installed between sleeve and nut to be measured or directly replaces sleeve use.
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| CN110926923A (en) * | 2019-11-25 | 2020-03-27 | 青海大学 | Load detachable test system for testing torsion-tension characteristics of bolt |
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| CN111344764A (en) * | 2017-11-09 | 2020-06-26 | 阿特拉斯·科普柯工具与装配系统有限公司 | Bolt joint display device and method |
| CN109139654A (en) * | 2018-10-10 | 2019-01-04 | 中国商用飞机有限责任公司 | Nonstandard bolt capable of being directly provided with load detection equipment |
| CN110000810A (en) * | 2018-12-18 | 2019-07-12 | 浙江大学台州研究院 | Zero-g manipulator fatigue test device |
| CN110000810B (en) * | 2018-12-18 | 2023-12-22 | 浙江大学台州研究院 | Application method of zero gravity manipulator fatigue testing device |
| CN110487630A (en) * | 2019-07-25 | 2019-11-22 | 中车永济电机有限公司 | A kind of motor car inspection and repair motor threephase cable is about wire clamp stress reliability consideration method |
| CN110487472A (en) * | 2019-09-12 | 2019-11-22 | 广东工业大学 | A kind of bolt loaded state test device |
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| CN110926923B (en) * | 2019-11-25 | 2021-10-29 | 青海大学 | Load detachable test system for testing torsion-tension characteristics of bolt |
| CN111999181A (en) * | 2020-08-31 | 2020-11-27 | 内江职业技术学院 | Thread bearing strength detection system |
| CN111999181B (en) * | 2020-08-31 | 2024-06-11 | 内江职业技术学院 | Screw thread bearing strength detecting system |
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