CN102914478A - Spring-lever energy storage type fatigue tension test machine - Google Patents

Spring-lever energy storage type fatigue tension test machine Download PDF

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Publication number
CN102914478A
CN102914478A CN2012104253715A CN201210425371A CN102914478A CN 102914478 A CN102914478 A CN 102914478A CN 2012104253715 A CN2012104253715 A CN 2012104253715A CN 201210425371 A CN201210425371 A CN 201210425371A CN 102914478 A CN102914478 A CN 102914478A
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CN
China
Prior art keywords
spring
lever
energy
load
fatigue
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Pending
Application number
CN2012104253715A
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Chinese (zh)
Inventor
张卫民
徐春广
于霞
邱勇
王书浩
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Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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Priority to CN2012104253715A priority Critical patent/CN102914478A/en
Publication of CN102914478A publication Critical patent/CN102914478A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a novel mechanical structure design scheme, which is used for testing test pieces made of various metal and alloy materials at room temperature and bearing tension fatigue characteristic, fatigue life and fatigue crack expansion test of mechanical parts (such as various mechanical connecting pieces). According to the scheme, a motor drives a speed reducer to rotate, the spring is subjected to energy storage by an eccentric shaft coupler and a crank connecting rod mechanism, the spring is controlled by four guide wheels to do vertical reciprocating motion, the potential energy of the spring is converted into moment through a lever, and extension and compression of the spring are reinforced by a lever mechanism, so that tension bars are separated vertically and the stretching effect is achieved; and force amplitude is changed through connecting points at different positions of the lever, so that fatigue tension tests of different frequency and different amplitude are realized. The invention is simple in structure and low in manufacturing cost, adopts a mechanical structure, can meet the basic performance requirement of the fatigue tension test, and can be applied to the tensile fatigue test under the lab environment.

Description

Spring-lever energy-storage type tensile experiment machine
Technical field
The present invention relates to a kind of simple and easy experimental machine design of under laboratory environment, carrying out the fatigue of materials tension test, can realize the fatigue experiment of the tensile test specimen under the within the specific limits different frequency and load value effect, a kind of solution of simple and convenient is provided for the materialogy fatigue experiment.
Background technology
The tensile experiment machine is a kind ofly to be mainly used in measuring the metal or alloy material and to bear repeated tensile load and do the machine of time spent fatigue of materials performance.Relatively common are at present electromagnetism cupping machine and hydraulic tensioning experimental machine etc., the former utilizes the effect of electromagnetic resonance principle property performance period tensile load, needs electromagnetic switching device; The predetermined pulsating nature pulling force of the latter hydraulic pulsation load principle realization needs the problems such as design fluid pressure line and solution sealing; Above-mentioned two kinds of functions of the equipments are more complete, and equipment price is more expensive, and multiplex torture test in carrying out in strict accordance with industrial specification is tested required expense more; Under many circumstances, just for some physical influences during Crack Extension under preformed material fatigue crack or the research trends load change, do not need Fatigue Characteristics of Materials is strictly demarcated, often adopt Simple compact equipment for this reason, need not more investment, can satisfy requirement of experiment.
The present invention proposes the design proposal of the simple and easy tensile experiment machine of a kind of mechanical type, adopt spring-lever construction, only need motor-driven, can realize applying of dynamic tensile load, low price, be easy to realize, can satisfy the metal material crack Propagation experiment demand under the dynamic tensile load.
The object of the invention is to provide for generation, evolution and the detection of research Fatigue Damage of Metal a kind of experimental provision of novel convenient practicality.
Summary of the invention
Fatigue elongation machine principle of work of the present invention realizes by following manner: adopt the rotation of Frequency Converter Control motor 7, motor 7 will rotatablely move by eccentric wheel 9, toggle and guiding mechanism 8 and be converted into spring 4 motion in the vertical direction, when crank and connecting rod movement arrives bottom, spring 4 is drawn as the longest, affect the force side of lever 2 to move upward, thereby test specimen is stretched; Upper bare terminal end at test specimen is equipped with strain-type force sensor 3, can measure the dynamic tensile magnitude of load, and is presented on the control panel; The frequency of tensile load can be definite by the parameter of setting frequency converter, and variation range is from 0-3Hz/s, and is stepless adjustable.
The design feature of this programme is to adopt motor directly to drive the speed reduction unit mode, does not need to realize energy conversion by electromagnetic conversion principle and hydraulic driving mode, directly converts electrical energy into mechanical energy, has significantly simplified the fatigue test device structure; Increased moment by speed reduction unit, realized rotatablely moving by eccentric shaft coupling, toggle and four-wheel guiding mechanism and changed the straight line extensional motion into; By leverage, realized the load amplification, change the power width of cloth by the spring interface on the lever diverse location; By energy-storaging spring, effectively reduce the percussive action of load, reduced mechanical vibration, realized the mild conversion of kinetic energy and potential energy, loading and unloading manner are carried out in strict accordance with the sinusoidal curve rule; By frequency converter is controlled, adjust motor rotation speed, thereby change cyclic load effect frequency; Therefore realized the tired tension test of different frequency, different amplitudes.
Beneficial effect:
The present invention provides a kind of experimental provision of simple and feasible for the tensile experiment of metal material.Some tensile experiment need not to purchase special-purpose Fatigue elongation machine, can realize by this device, thereby can effectively reduce cost.Can regulate the tensile load frequency by frequency converter, realize the variation of tensile load value by the coupled position of lever and spring, motor slows down by speed reduction unit, realizes that moment increases; By eccentric wheel, toggle and four-wheel guiding mechanism, the rotation of motor effectively is converted into spring to-and-fro movement in the vertical direction, test specimen is stretched repeatedly; By accumulation of energy and the release of spring, the realizable force value is transmitted, and reduces the impact of vibratory impulse, and the assurance dynamic loading increases with sinusoidal manner and reduces, thereby realizes comparatively ideal tensile experiment effect.
Description of drawings
Fig. 1 is drawing machine one-piece construction figure;
Among the figure: 1-groove, 2-lever, 3-power sensor, 4-energy-storaging spring, 5-stretching head, 6-can regulate base stretching head, 7-motor, 8-guiding mechanism, 9-eccentric wheel, the 10-speed reduction unit of pretightning force.
Fig. 2 is tensile test specimen;
Fig. 3 is the drawing machine pictorial diagram,
Embodiment
For objects and advantages of the present invention are described better, the present invention will be further described below in conjunction with the drawings and specific embodiments.
Select 16MnR material commonly used in the pressure vessel to make tensile test specimen among the embodiment, the effective width of test specimen to be measured is 26mm, and the thickness of test specimen is 4mm,, the structural dimensions of test specimen is shown in Figure 2.
Implementation process: 1, at first the gib screw of drawing machine up-down stretch 5,6 is extracted, test specimen is put into when aliging with the up-down stretch head, gib screw is inserted wherein, this moment, test specimen was fixed on the drawing machine.2, plugged switch, this moment, power light was bright.3, setting pretightning force by the adjusting base nut is 10000N, and the pulling force indication on the control panel can be seen pretightning force.4, the frequency converter adjustment on the control panel is used for determining the per second drawing numbers, and frequency converter regulating frequency scope is 1-3Hz, can be set to 2Hz.5, press start button, drawing machine begins tensile test specimen.By the pulling force indicated number pulling force of pulling force sensor on the drawing machine control panel, perhaps link to each other with oscillograph and can see the pulling force waveform.Counter on the panel is used for showing drawing numbers, if need to carry out zero clearing or stretch next time pressing several reset buttons, and just can be with counter O reset.When test specimen was broken, counter showed 13779 on the panel, and pulling force is that 0 drawing machine stops automatically this moment, unloads workpiece, and this time stretching experiment is finished.

Claims (5)

1. the tired cupping machine of spring-lever energy-storage type is characterized in that adopting spring-lever machinery formula structure, is comprised of motor 7, speed reduction unit 10, eccentric wheel 9, energy-storaging spring 4, lever 2 and stretching head 5; Motor 7 drives speed reduction unit 10 rotations, realizes that electric energy to the conversion of mechanical energy, provides torque to test specimen; Spring 4 has accumulation of energy and damping effect, reduces the impact of load, and impact energy at first is stored in the spring in the mode of deformation potential,
Form is at first guaranteeing that load evenly gently acts on the tensile test specimen with sinusoidal form, by eccentric wheel 9 and guide wheel mechanism 8, realizes unidirectional larger displacement output; By high strength tension spring 4, realize the storage of mechanical energy, and by lever 2, realize potential energy to the conversion of kinetic energy, and realize the amplification of tensile load.
2. the stretching experiment unit frequency governor motion that requires according to power 1, its essential characteristic is: by the rotating speed of control frequency converter regulating electric machine 7, realize the conversion of moment by speed reduction unit 10, the rotation of motor 7 is converted into the rectilinear motion of spring 4 by eccentric wheel 9 and toggle, guarantee stretching and the reinstatement that motor rotates a circle and can realize spring by guiding mechanism 8, eccentric wheel 9 and toggle, and then by loading and the unloading of lever boosting mechanism realization to test specimen; When the motor continuous rotation, can finish the tensile fatigue test of test specimen.
3. the stretching experiment machine load value governor motion that requires according to power 1, its essential characteristic is: can change by the relative position of spring 4 and lever 2 and realize the load value adjusting.Apical position at lever 2 designs several grooves 1, can be by spring 4 being placed on the different groove location variation that realizes lever 2 length, and then realize the variation of spring maximum tension load; Simultaneously, the stretching head 6 that is fixed on base can be adjusted the position as required, and then regulates pretightning force, thereby obtains suitable tensile force.
4. the airborne lotus effect of the stretching experiment guiding mechanism that requires according to power 1, its essential characteristic is: guiding mechanism 8 is comprised of 4 guide wheels and toggle, four guide wheels have limited the action direction of power, guarantee that load can only put on the spring draw direction, when making rotatablely moving of motor 7 become the rectilinear motion of spring 4, the pulling force useful effect on spring 4, is guaranteed that spring 4 does up-and-down movement, and effectively reduce friction power loss, offset the component effect of other direction.
5. the relative parameters setting of this stretching experiment machine, record and measurement function are realized by following manner: at the experimental machine control panel power switch and power light, start/stop button, counter and counting reset button, resistance-strain dynamometer and indicating value display, frequency converter adjusting knob etc. are installed.Starting power switch makes experimental machine enter duty, whether the power light display working condition is normal, start/stop button control experimental machine is opened and is stopped, counter is used for recording the cyclic loading number of times, electric wire strain gauge and display are used for measuring and the record load value, by frequency converter adjusting knob controlled circulation load frequency.
CN2012104253715A 2012-10-30 2012-10-30 Spring-lever energy storage type fatigue tension test machine Pending CN102914478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2012104253715A CN102914478A (en) 2012-10-30 2012-10-30 Spring-lever energy storage type fatigue tension test machine

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103353429A (en) * 2013-06-25 2013-10-16 南京航空航天大学 Simple test-piece fatigue testing machine
CN103837420A (en) * 2014-03-14 2014-06-04 唐山轨道客车有限责任公司 Pulse fatigue testing machine and fatigue testing device used by same
CN103994934A (en) * 2014-04-30 2014-08-20 中国船舶重工集团公司第七二五研究所 Mechanical-linkage test machine for simultaneously performing fatigue tests on N metal samples
CN104236888A (en) * 2014-09-09 2014-12-24 宁波昌隆机电有限公司 Spring fatigue tensile test device and method
CN106226057A (en) * 2016-08-22 2016-12-14 中国科学院等离子体物理研究所 A kind of easy reciprocal non-percussion load charger
CN107328508A (en) * 2015-06-16 2017-11-07 余伟雄 It is a kind of evaluate striking capabilities method and assessment device, and assessment device check and correction
CN107631946A (en) * 2017-09-07 2018-01-26 河海大学 A kind of testing machine pre-add power apparatus
CN108645696A (en) * 2018-05-10 2018-10-12 西安交通大学 A kind of separate type split-Hopkinson torsional bar accumulation of energy and release device and operating method
CN110487543A (en) * 2019-09-09 2019-11-22 山东理工大学 A kind of luffing pulsating cyclic load loading experimental apparatus
CN110646303A (en) * 2019-10-29 2020-01-03 成都西交轨道交通技术服务有限公司 Steel rail fastener assembly drop hammer test device and monitoring system

Citations (4)

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JPH04115135A (en) * 1990-09-05 1992-04-16 Toshiba Mach Co Ltd Auxiliary apparatus for torsional fatigue test
CN1072260A (en) * 1991-11-12 1993-05-19 中国科学院金属腐蚀与防护研究所 A kind of low-frequency fatigue test machine
CN1073011A (en) * 1991-12-04 1993-06-09 中国科学院金属腐蚀与防护研究所 Stepless speed regulating alternate-loading device and fatigue machine
CN102262004A (en) * 2011-04-29 2011-11-30 中国矿业大学 Loading fatigue tester

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04115135A (en) * 1990-09-05 1992-04-16 Toshiba Mach Co Ltd Auxiliary apparatus for torsional fatigue test
CN1072260A (en) * 1991-11-12 1993-05-19 中国科学院金属腐蚀与防护研究所 A kind of low-frequency fatigue test machine
CN1073011A (en) * 1991-12-04 1993-06-09 中国科学院金属腐蚀与防护研究所 Stepless speed regulating alternate-loading device and fatigue machine
CN102262004A (en) * 2011-04-29 2011-11-30 中国矿业大学 Loading fatigue tester

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103353429A (en) * 2013-06-25 2013-10-16 南京航空航天大学 Simple test-piece fatigue testing machine
CN103353429B (en) * 2013-06-25 2015-12-09 南京航空航天大学 A kind of Simple test-piece fatigue tester
CN103837420B (en) * 2014-03-14 2016-06-29 唐山轨道客车有限责任公司 Pulse fatigue testing machine fatigue experimental device and pulse fatigue testing machine
CN103837420A (en) * 2014-03-14 2014-06-04 唐山轨道客车有限责任公司 Pulse fatigue testing machine and fatigue testing device used by same
CN103994934A (en) * 2014-04-30 2014-08-20 中国船舶重工集团公司第七二五研究所 Mechanical-linkage test machine for simultaneously performing fatigue tests on N metal samples
CN103994934B (en) * 2014-04-30 2016-01-27 中国船舶重工集团公司第七二五研究所 The N number of test button of a kind of confession does the mechanical linkage test machine of torture test simultaneously
CN104236888A (en) * 2014-09-09 2014-12-24 宁波昌隆机电有限公司 Spring fatigue tensile test device and method
CN107328508B (en) * 2015-06-16 2019-08-23 余伟雄 A kind of check and correction of method that evaluating striking capabilities and assessment device and assessment device
CN107328508A (en) * 2015-06-16 2017-11-07 余伟雄 It is a kind of evaluate striking capabilities method and assessment device, and assessment device check and correction
CN106226057A (en) * 2016-08-22 2016-12-14 中国科学院等离子体物理研究所 A kind of easy reciprocal non-percussion load charger
CN107631946A (en) * 2017-09-07 2018-01-26 河海大学 A kind of testing machine pre-add power apparatus
CN108645696A (en) * 2018-05-10 2018-10-12 西安交通大学 A kind of separate type split-Hopkinson torsional bar accumulation of energy and release device and operating method
CN110487543A (en) * 2019-09-09 2019-11-22 山东理工大学 A kind of luffing pulsating cyclic load loading experimental apparatus
CN110646303A (en) * 2019-10-29 2020-01-03 成都西交轨道交通技术服务有限公司 Steel rail fastener assembly drop hammer test device and monitoring system
CN110646303B (en) * 2019-10-29 2021-04-13 成都西交轨道交通技术服务有限公司 Steel rail fastener assembly drop hammer test device and monitoring system

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