CN103018032A - Fatigue testing machine for lifetime measurement of cantilever parts - Google Patents
Fatigue testing machine for lifetime measurement of cantilever parts Download PDFInfo
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- CN103018032A CN103018032A CN2012105638857A CN201210563885A CN103018032A CN 103018032 A CN103018032 A CN 103018032A CN 2012105638857 A CN2012105638857 A CN 2012105638857A CN 201210563885 A CN201210563885 A CN 201210563885A CN 103018032 A CN103018032 A CN 103018032A
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Abstract
A fatigue testing machine for lifetime measurement of cantilever parts comprises a base, a motor, an eccentric mechanism, a loading mechanism and a test piece clamping device. Rotation of the motor is converted into variable amplitude constant-amplitude reciprocating motion by the eccentric mechanism and the loading mechanism. The front end and bottom of a cantilever test piece to be tested are fixed by the test piece clamping device, so that the front end of the cantilever test piece is allowed to fatigue by reciprocating swing. The defect that commercially available instruments are not applicable to structural fatigue lifetime measurement of practical cantilever parts but applicable to material fatigue lifetime measurement of standard parts only is overcome, test conditions that existing commercial products cannot achieve can be achieved, serving actual lifetimes of the cantilever parts are predicted more accurately, and more reliable basis for structural design and modeling of the cantilever parts.
Description
Technical field
The present invention relates to a kind of testing apparatus fatigue lifetime of mechanical component, particularly a kind of testing apparatus fatigue lifetime of cantilever type mechanical component.
Background technology
In fields such as machinery, metallurgy, chemistry, buildings, but cantilever design often the weak link in the system be indispensable key position.Under various standard or off-gauge Cyclic Load, cantilever design is easy to fatigue break and lost efficacy, and will probably cause caving in of whole system in case lose efficacy, thereby have a strong impact on the progress of work, greatly reduces production efficiency.Therefore seem extremely important to passing judgment on the fatigue lifetime of cantilever design for the economic benefit of the design and selection of structure and even whole industry.
At present the analysis of Fatigue-life for cantilever design often needs to adopt finite element analogy, and the S-N Fatigue Life Curve of bond material, can't be directly and accurately characterize actual fatigue lifetime of the parameter of cantilever part.
Summary of the invention
The purpose of this invention is to provide a kind of fatigue tester for the cantilever part lifetime measurement, carry out torture test for cantilever beam structure specially, can obtain more reliable, accurate, convictive cantilever beam structure parameter fatigue lifetime, for prediction actual life of cantilever part provides reliable experimental basis, and provide reference for the design and selection of structural member.
Technical scheme of the present invention is as follows:
A kind of fatigue tester for the cantilever part lifetime measurement is characterized in that: this surveying instrument comprises support, motor, eccentric stiffener, load maintainer and sample holding device; Described motor is fixed on the support, and eccentric stiffener comprises eccentric disc, eccentric block and leading screw; Described load maintainer comprises front rod, push rod, linear bearing, pull pressure sensor, back link transfer block and back link; Described eccentric disc front end face has groove, and described leading screw is installed in the groove, and leading screw and eccentric block form threaded engagement, and leading screw is installed on the eccentric disc by upper end cover and bottom end cover; Described front rod one end and eccentric block are hinged, an end of the hinged push rod of the other end; Described push rod is limited to horizontal motion by linear bearing, and the other end of push rod connects pull pressure sensor; Described back link transfer block one end connects pull pressure sensor, hinged back link one end of the other end; The back link other end connects sample holding device; Described sample holding device is locked the front end of tested cantilever sample, does the tiring exercises of reciprocally swinging under the drive of push rod and back link.
Front rod of the present invention all adopts two parallel connecting rods to form with back link.
The present invention has the following advantages and the technique effect of high-lighting: 1. the present invention has overcome on the market existing instrument and only can carry out material fatigue life to standard component and measure, and can't carry out to the cantilever part of reality the defective that structure fatigue life is measured, can realize the experiment condition that present commercial product can't be realized, predict more accurately the actual life that cantilever part is on active service, for structural design and the type selecting of cantilever part provides more reliable foundation.2. this testing machine adopts the mode that is rigidly connected and loads, and can carry out to cantilever design the push-and-pull fatigue experiment of symmetrical amplitude, guarantees that speed of experiment is enough fast, and guarantees the cogency of experiment effect.3. this testing machine tension-compression sensor of connecting in load maintainer can detect and record the load change situation in the torture test process, accurately judges the inefficacy fatigue period number of cantilever design.4. the present invention adopts back link to increase the DOF (degree of freedom) redundance number that loads in the link, guarantees the stuck situation of testing machine not occur in the loading procedure.
Description of drawings
Fig. 1 is structural principle synoptic diagram of the present invention.
Fig. 2 is the structural representation of eccentric stiffener of the present invention.
Fig. 3 is the A-A cut-open view of Fig. 2.
Among the figure: the 1-support; The 2-motor; The 3-DOCK LEVELER; The 4-eccentric disc; The 5-eccentric block; The 6-front rod; The 7-bearing pin; The 8-push rod; The 9-linear bearing; 10-linear axis bearing; The 11-pull pressure sensor; 12-back link transfer block; The 13-bearing pin; The 14-back link; The 15-bearing pin; Grab ring before the 16-; Grab ring behind the 17-; The tested cantilever sample of 18-; The 19-sample base; The 20-bearing seat; The 21-bottom end cover; The 22-leading screw; The 23-set nut; The 24-upper end cover; The 25-groove.
Embodiment
Below in conjunction with accompanying drawing concrete structure of the present invention, principle of work are further described.
With reference to Fig. 1, Fig. 2 and Fig. 3, this surveying instrument is made of support 1, motor 2, eccentric stiffener, load maintainer and sample holding device four parts.Wherein, motor 2 is fixed on the support 1, and eccentric stiffener comprises eccentric disc 4, eccentric block 5 and leading screw 22; Load maintainer comprises front rod 6, push rod 8, linear bearing 9, pull pressure sensor 11, back link transfer block 12 and back link 14; Have groove at eccentric disc 4 front ends, described leading screw 22 is installed in the groove, and leading screw 22 forms threaded engagement with eccentric block 5, and leading screw is installed on the eccentric disc 4 by upper end cover 24 and bottom end cover 21.Front rod 6 one ends and eccentric block 5 are hinged, an end of the hinged push rod 8 of the other end.Push rod 8 is limited to horizontal motion by linear bearing 9, and the other end of push rod connects pull pressure sensor 11.Back link transfer block 12 1 ends connect pull pressure sensor 11, hinged back link 14 1 ends of the other end.The other end of back link 14 connects sample holding device; Described sample holding device is locked the front end of tested cantilever sample 18, does the tiring exercises of reciprocally swinging under the drive of push rod 8 and back link 14.The rear end of tested cantilever sample 18 is fixed on the sample base 19, and sample base 19 is fixed on the support 1 by guide rail.Guide rail direction on the support is parallel with tested cantilever sample front end extension, guarantee tested cantilever sample can be on perpendicular to loading direction any location.
With reference to Fig. 2, the leading screw end is provided with set nut 23, is threaded connection eccentric block 5 on the leading screw, and leading screw 22 forms threaded engagement with eccentric block 5.
Principle of work of the present invention is as follows:
Starter motor 2, motor 2 drive eccentric disc 4 rotations.When eccentric block 5 was not positioned at eccentric disc 4 center, eccentric block 5 carried out circular-rotation.Like this, eccentric disc, eccentric block, front rod and push rod 8 form the slider-crank mechanism group, and the circular motion of eccentric block 5 is converted into the to-and-fro movement of push rod 8.Push rod 8 promotes tested cantilever sample 18 front end reciprocally swingings by pull pressure sensor 11 and back link, can carry out the fatigue loading experiment to tested cantilever sample.
When adjusting fatigue load, disable motor 2, unload lock jack panel 23, rotational lead screw 22 is the eccentric distance of adjustable eccentric piece 5 just, and then changes fatigue load.Adjust complete after, again with locking nut screwing, prevent load change in the torture test process.When tested cantilever sample is installed, at first remove being connected between sample base 19 and the support 1, tested cantilever sample and sample base be bolted, with front grab ring 16 and after grab ring 17 fixed positions that are installed on the tested cantilever sample 18.Adjust eccentric disc 4 to leading screw 22 position perpendicular to the ground, sample base 19 and the guide rail on the support 1 are fixed.
Claims (2)
1. fatigue tester that is used for the cantilever part lifetime measurement, it is characterized in that: this surveying instrument comprises support (1), motor (2), eccentric stiffener, load maintainer and sample holding device; Described motor (2) is fixed on the support (1), and eccentric stiffener comprises eccentric disc (4), eccentric block (5) and leading screw (22); Described load maintainer comprises front rod (6), push rod (8), linear bearing (9), pull pressure sensor (11), back link transfer block (12) and back link (14); Described eccentric disc (4) front end face has groove (25), and described leading screw (22) is installed in the groove, and leading screw (22) forms threaded engagement with eccentric block (5), and leading screw is installed on the eccentric disc (4) by upper end cover (24) and bottom end cover (21); Described front rod (6) one ends and eccentric block (5) are hinged, an end of the hinged push rod of the other end (8); Described push rod (8) is limited to horizontal motion by linear bearing (9), and the other end of push rod connects pull pressure sensor (11); Described back link transfer block (12) one ends connect pull pressure sensor (11), hinged back link (14) one ends of the other end; The back link other end connects sample holding device; Described sample holding device is locked the front end of tested cantilever sample (18), does the tiring exercises of reciprocally swinging under the drive of push rod (8) and back link (14).
2. a kind of fatigue tester for the cantilever part lifetime measurement as claimed in claim 1 is characterized in that: described front rod (6) all adopts two parallel connecting rods to form with back link (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105638857A CN103018032A (en) | 2012-12-21 | 2012-12-21 | Fatigue testing machine for lifetime measurement of cantilever parts |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105638857A CN103018032A (en) | 2012-12-21 | 2012-12-21 | Fatigue testing machine for lifetime measurement of cantilever parts |
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| CN103018032A true CN103018032A (en) | 2013-04-03 |
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| CN2012105638857A Pending CN103018032A (en) | 2012-12-21 | 2012-12-21 | Fatigue testing machine for lifetime measurement of cantilever parts |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592117A (en) * | 2013-11-22 | 2014-02-19 | 深圳天祥质量技术服务有限公司 | Handle fatigue test machine |
| CN104316870A (en) * | 2014-10-22 | 2015-01-28 | 浙江毅力汽车空调有限公司 | Fatigue test device of vehicle air conditioner speed regulation device |
| CN104677408A (en) * | 2014-12-12 | 2015-06-03 | 中国航空工业集团公司北京长城计量测试技术研究所 | Device and method for testing fatigue life of optical fiber grating sensors |
| CN104697758A (en) * | 2013-12-04 | 2015-06-10 | 广州汽车集团股份有限公司 | Two force member test bed |
| CN108918124A (en) * | 2018-07-17 | 2018-11-30 | 大连理工大学 | A kind of more bolts loosen testing machine transverse load amplitude closed loop control method |
| CN110595880A (en) * | 2019-08-16 | 2019-12-20 | 南京理工大学 | Mesoscale cantilever beam bending fatigue testing device and testing method |
| WO2019242104A1 (en) * | 2018-06-22 | 2019-12-26 | 潍柴动力股份有限公司 | Fatigue test assessment method |
| CN111551456A (en) * | 2020-04-14 | 2020-08-18 | 大连理工大学 | Sensor for monitoring local residual fatigue life of mechanical part under multi-axis load and design method |
| CN112098061A (en) * | 2020-09-04 | 2020-12-18 | 深圳创维－Rgb电子有限公司 | Display panel testing device |
| CN113092086A (en) * | 2021-03-24 | 2021-07-09 | 徐州徐工挖掘机械有限公司 | Handrail durability test device and test method |
| CN113109047A (en) * | 2021-04-09 | 2021-07-13 | 宁波博力汽车零部件有限公司 | Workbench for detecting service life of push rod of die-casting die |
| CN116929689A (en) * | 2023-09-18 | 2023-10-24 | 扬州东升汽车零部件股份有限公司 | Fatigue testing device for cab suspension system |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592117B (en) * | 2013-11-22 | 2016-04-06 | 深圳天祥质量技术服务有限公司 | A kind of handle fatigue test machine |
| CN103592117A (en) * | 2013-11-22 | 2014-02-19 | 深圳天祥质量技术服务有限公司 | Handle fatigue test machine |
| CN104697758A (en) * | 2013-12-04 | 2015-06-10 | 广州汽车集团股份有限公司 | Two force member test bed |
| CN104697758B (en) * | 2013-12-04 | 2017-05-31 | 广州汽车集团股份有限公司 | Two power rod member test-beds |
| CN104316870A (en) * | 2014-10-22 | 2015-01-28 | 浙江毅力汽车空调有限公司 | Fatigue test device of vehicle air conditioner speed regulation device |
| CN104677408A (en) * | 2014-12-12 | 2015-06-03 | 中国航空工业集团公司北京长城计量测试技术研究所 | Device and method for testing fatigue life of optical fiber grating sensors |
| CN104677408B (en) * | 2014-12-12 | 2017-04-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Device and method for testing fatigue life of optical fiber grating sensors |
| US11346745B2 (en) | 2018-06-22 | 2022-05-31 | Weichai Power Co., Ltd. | Fatigue test assessment method |
| WO2019242104A1 (en) * | 2018-06-22 | 2019-12-26 | 潍柴动力股份有限公司 | Fatigue test assessment method |
| CN108918124A (en) * | 2018-07-17 | 2018-11-30 | 大连理工大学 | A kind of more bolts loosen testing machine transverse load amplitude closed loop control method |
| CN110595880A (en) * | 2019-08-16 | 2019-12-20 | 南京理工大学 | Mesoscale cantilever beam bending fatigue testing device and testing method |
| CN111551456B (en) * | 2020-04-14 | 2021-06-08 | 大连理工大学 | Mechanical part fatigue life monitoring sensor under multi-axis load and design method |
| CN111551456A (en) * | 2020-04-14 | 2020-08-18 | 大连理工大学 | Sensor for monitoring local residual fatigue life of mechanical part under multi-axis load and design method |
| CN112098061A (en) * | 2020-09-04 | 2020-12-18 | 深圳创维－Rgb电子有限公司 | Display panel testing device |
| CN113092086A (en) * | 2021-03-24 | 2021-07-09 | 徐州徐工挖掘机械有限公司 | Handrail durability test device and test method |
| CN113109047A (en) * | 2021-04-09 | 2021-07-13 | 宁波博力汽车零部件有限公司 | Workbench for detecting service life of push rod of die-casting die |
| CN116929689A (en) * | 2023-09-18 | 2023-10-24 | 扬州东升汽车零部件股份有限公司 | Fatigue testing device for cab suspension system |
| CN116929689B (en) * | 2023-09-18 | 2023-12-05 | 扬州东升汽车零部件股份有限公司 | Fatigue testing device for cab suspension system |
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Application publication date: 20130403 |