CN100552420C - The method of testing of strength tester dynamic force value measurement accuracy and power value generation device - Google Patents
The method of testing of strength tester dynamic force value measurement accuracy and power value generation device Download PDFInfo
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- CN100552420C CN100552420C CNB2006100687033A CN200610068703A CN100552420C CN 100552420 C CN100552420 C CN 100552420C CN B2006100687033 A CNB2006100687033 A CN B2006100687033A CN 200610068703 A CN200610068703 A CN 200610068703A CN 100552420 C CN100552420 C CN 100552420C
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Abstract
The present invention is a kind of method of testing and power value generation device of strength tester dynamic force value measurement accuracy.During verification, with strength tester minimum speed pulling-off force value generation device, the power value that record this moment is standard near static force value with this power value; Raising speed pulling-off force value generation device, the power value that records and its relatively calculate its error; Further raising speed pulling-off force value generation device compares its power value error, reaches maximum permissible value until error, and the stretching time of this moment is this strength tester at the minimum rupture time of following sample that can reach of the situation of desired accuracy; During test, rupture time does not reach accuracy requirement less than the experiment of this time.Measured value to the same power value of power value generation device during by low speed and high speed compares, and judges whether the strength tester dynamic perfromance meets the requirements.
Description
Technical field
The present invention relates to a kind ofly under current intelligence, method and verification that the various strength testers of verification (machine) (hereinafter to be referred as strength tester) record power value accuracy firmly are worth generation device.Said strength tester (machine) is the instrument that is used for testing various samples stretchings or compression performance.This method is applicable to little load strength tester that draw speed is higher or very high or Material Testing Machine and might carries out that very short time breaks or the testing machine of crushing test.
Technical background
The basic function that various strength testers all have peak value to keep, when tensile sample, the power value changes, and instrument always writes down bigger numerical value, when sample is broken, then writes down the maximum, force value.
Accurately whether strength tester records the power value, need carry out verification by the utensil that produces the proof force value.Past all is firmly to be worth counterweight or dynamometer applies static force value on the clamper of strength tester, compares with the demonstration indicating value of strength tester, determines its static indicating value accuracy, does not carry out the verification of dynamic force value accuracy.Yet, the strength tester dynamometry is a dynamic process, because the inertia of strength tester dynamometry part, the rigidity of sensor, the powerful machine of electronics also have the influence of many factors such as data acquisition ability of computer data acquisition system, strength tester static state records the power value when accurate, it is but not necessarily accurate dynamically to record the power value, particularly under the situation of sample fracture time than weak point, difference can be more obvious.At the stress strain curve of correct drawing sample, particularly when carrying out fabric tear test and curve plotting, higher to the dynamic perfromance requirement of strength tester.
Wish to get and know whether strength tester dynamically down records the power value accurate, drawing process that must the simulation sample uses a kind of device of stablizing constant power value that can produce under current intelligence, check the accuracy of strength tester measured value under current intelligence.
Present national metering technology normalized JJF1103-2003 " evaluation of universal testing machine computer data acquisition system " is applicable to the data accuracy and the conforming evaluation of universal testing machine quasi-static test computer data acquisition system.It " adopts the mode of comparison test to measure computer data acquisition system; its method is the master data that computer data acquisition system obtained of universal testing machine, derived data to be write down resulting result with the drawing on same the testing machine compare (unit comparison method); perhaps compare with the resulting result of other testing machines (multimachine comparison method); estimate its consistance, to evaluate the computer data acquisition system accuracy of experimental results ".
Through retrieval, do not find other current intelligences under to evaluate or the method for verification strength tester or testing machine dynamic force value accuracy.
Summary of the invention
Technical matters to be solved by this invention is, a kind of method of testing and power value generation device of strength tester dynamic force value measurement accuracy are provided, measured value to the same power value of power value generation device during by low speed and high speed compares, and judges whether the strength tester dynamic perfromance meets the requirements.
The technical solution adopted for the present invention to solve the technical problems is as follows:
A kind of method of testing of strength tester dynamic force value measurement accuracy, carry out the verification of dynamic force value by power value generation device, described power value generation device comprises the two blocks of magnet up and down that are fixed on two magnetic receivers, last hook is connected on the magnetic receiver, and lower draw-bar is connected the lower end that is installed on the spring in the lower magnet seat; The pull bar that lower draw-bar connects spring is divided into two joints of working in coordination, i.e. the sleeve pipe of screw rod and band internal thread;
During verification, strength tester should be by the calibration of static force value, and with strength tester minimum speed pulling-off force value generation device, the power value that record this moment is standard near static force value with this power value;
Raising speed pulling-off force value generation device, the power value that records and its relatively calculate its error;
Further raising speed pulling-off force value generation device compares its power value error, reaches maximum permissible value until error, and the stretching time of this moment is this strength tester at the minimum rupture time of following sample that can reach of the situation of desired accuracy;
During test, rupture time does not reach accuracy requirement less than the experiment of this time.
The magnetic receiver and the magnet of power value generation device all are slidingly mounted in the orienting sleeve; And on orienting sleeve, be provided with gathering sill, the pin that can slide in gathering sill is housed on the lower magnet seat; On the position of orienting sleeve, have air hole corresponding to the attraction face.
Concrete checking procedure is as follows:
(1), power value generation device is installed:
(a), brace is sandwiched in respectively in the upper and lower holder of strength tester up and down, suitably screws clamper;
(b), connect in the film perforation, enter experimental state, the strength tester automatic clear with hanging on the power value generation device;
(c), power value generation device lower draw-bar is hung over down on the brace, the screw mandrel value of exerting all one's strength generation device contraction in length of revolving force value generation device lower end makes idle running as far as possible little, and install this moment, can test;
(2), strength tester presets and verification
(a), test at strength tester minimum load shelves;
(b), strength tester resets, and draw speed is arranged on minimum speed;
(c), enter test, this moment the strength tester automatic clear, the pre-tension numerical value that added is originally eliminated;
(d), stretch record data, and calculating mean force value 10 times.
(e), power value generation device is motionless, strength tester resets and is reset at constant speed and stretches, draw speed is arranged on a definite value speed;
(f), stretch record data, and calculating mean force value and average rupture time 10 times;
(g), improve the operation that draw speed repeats (e), (f), record power value and test for the first time relatively up to strength tester, judge whether low below the accuracy of setting, the rupture time of record this moment;
(h), if when the strength tester maximal rate, the power value of recording does not drop to below the accuracy of setting yet, it is bigger then the spring in the power value power value generation device should to be replaced by rigidity, test again.
Described power value generation device comprises the two blocks of magnet up and down that are fixed on two magnetic receivers, and last hook is connected on the magnetic receiver, and lower draw-bar is connected the lower end that is installed on the spring in the lower magnet seat; The pull bar that lower draw-bar connects spring is divided into two joints of working in coordination, and promptly the sleeve pipe magnetic receiver and the magnet of screw rod and band internal thread all are slidingly mounted in the orienting sleeve; And on orienting sleeve, be provided with gathering sill, the pin that can slide in gathering sill is housed on the lower magnet seat; On the position of orienting sleeve, have air hole corresponding to the attraction face.
The form of the quality of strength tester clamper and link thereof and shape, sensor and rigidity (being the natural frequency of this assembly) influence the shape and the height of F-t curve rising edge, are different under friction speed; When speed was high, rupture time was short, and acceleration is big, and the inertia that quality is big is big, and sensor deformation is slow, showed indicating value less than actual value, and curve is on the low side.The shortest time of the accurate collection raw data of the powerful computer machine part of electronics (accurately image data cycle) then is the factor that can decision collect maximum, force value in the curve; The collection period of instrument is constant, but the rupture time of sample shortens with the increase of draw speed, and short more each test for data times of collection of time is just few more; It near the maximal value last collection period, whole test in the time accounting example big, the probability of this interval censored data collection is equally distributed, repeatedly the mean value of Cai Jiing should be this interval mean value, with the maximal value error of reality should be bigger, otherwise less; Therefore, to break the length relation of time very big for the accuracy of strength tester dynamometry and sample.When rupture time was more than tens seconds, times of collection was a lot, and dynamic and static state records the power value and differs very little, and repeatedly the CV value of Ce Lianging is very little, and when the power value generation device among employing the present invention, the CV value may be near zero; And when rupture time shortened gradually, the dynamic force value that records will reduce thereupon, and the CV value is gradually big; When rupture time is short to below 1 second, the dynamic force value that the strength tester of dynamic perfromance difference records will obviously reduce, and the CV value obviously increases, can this shortest rupture time when determining accuracy requirement that strength tester can reach.The method of the dynamic dynamometry performance of verification strength tester provided by the invention realizes according to above principle.
Good effect of the present invention is: the measured value to the same power value of power value generation device during by low speed and high speed compares, and judges whether the strength tester dynamic perfromance meets the requirements.The present invention has imitated the process that sample stretches quite similarly; And the rising edge of power value is linear, is convenient to judge the order of accuarcy that records the power value; Repeatability is fine, and the change difference is very little; In application, it is equivalent to a force value stabilization, repeatability is fine
The structure of power value generation device as shown in Figure 1, last magnet 3 and lower magnet 2 are separately fixed on two magnetic receivers, on link up with 5 and directly be fixed on the magnetic receiver 4, lower draw-bar 8 passes to lower magnet seat 1 by a spring 7 with power; Be provided with orienting sleeve 6 for preventing to slide between the attraction face; Be provided with gathering sill for preventing to rotate on the orienting sleeve 6 between the attraction face, on the lower magnet seat 1 pin be housed, can in gathering sill, slide; On the position of orienting sleeve 6, have air hole, form vacuum when preventing to throw off between magnet corresponding to the attraction face.In order to regulate the installation length of power value generation device original state, the pull bar that lower draw-bar 8 connects spring 7 is divided into two joints of working in coordination, i.e. the sleeve pipe 10 of screw rod 9 and band internal thread.
When the strength tester constant speed stretches, power is delivered between the suction surface of two blocks of magnet by compressed spring 7, because length of spring compressed meets Hooke's law, the strength tester indicating value is linear to be increased, when force of compression behind the spring energy-storage reaches greatest attraction forces between magnet, two magnet will separate, suction between magnet reduces rapidly with the increase of its spacing, throws off rapidly under the effect of spring force, and the power between last lower draw-bar will sharply reduce, the strength tester indicating value descends very steep, F-t (or F-E) curve such as Fig. 2.
Should make the power value generation device of different power values according to the range difference of strength tester.
During verification, strength tester should be by the calibration of static force value, and with strength tester minimum speed pulling-off force value generation device, the power value that record this moment is standard near static force value with this power value; Raising speed pulling-off force value generation device, the power value that records and its relatively calculate its error; Improve speed pulling-off force value generation device again, relatively its power value error; Reach maximum permissible value until error, the stretching time of this moment is this strength tester at the minimum rupture time of following sample that can reach of the situation of desired accuracy.During test, rupture time does not reach accuracy requirement less than the experiment of this time.
Below to examine and determine with electronics fabric strength instrument dynamic force value with weaving be that example illustrates this method.
Remove the foreign matters such as iron filings between the magnet in the power value generation device in advance.
One, power value generation device is installed:
1, brace is sandwiched in the upper and lower holder of strength tester up and down, suitably screws clamper.
2, connect in the film perforation being hooked on the power value generation device, enter experimental state, the strength tester automatic clear.
3, will be hooked on down on the brace under the power value generation device, the screw mandrel value of exerting all one's strength generation device contraction in length of revolving force value generation device lower end makes idle running very little.Install this moment.Can test.
Two, strength tester presets and tests
4, test at strength tester minimum load shelves
5, strength tester resets, and draw speed is arranged on minimum speed.
6, enter test (this moment strength tester automatic clear, the pre-tension numerical value that added is originally eliminated).
7, stretch 10 times, record data, and calculate the mean force value.
8, power value generation device is motionless, and strength tester resets and is reset at the constant speed stretching, and draw speed is arranged on 50mm/min.
9, stretch 10 times, record data, and calculate mean force value F
50With average rupture time t
50
10, improve draw speed repeat 8,9, operation, record power value and test for the first time relatively up to strength tester, judge whether low to below 98%, the rupture time of record this moment.
11, if when the strength tester maximal rate, the power value of recording does not drop to below 98% yet, and it is bigger then the spring in the power value power value generation device should to be replaced by rigidity, test again.
Claims (4)
1, a kind of method of testing of strength tester dynamic force value measurement accuracy, carry out the verification of dynamic force value by power value generation device, it is characterized in that: described power value generation device comprises the two blocks of magnet up and down that are fixed on two magnetic receivers, last hook (5) is connected on the magnetic receiver (4), lower draw-bar (8) is connected the lower end that is installed on the spring (7) in the lower magnet seat (1), the pull bar that lower draw-bar (8) connects spring is divided into two joints of working in coordination, i.e. the sleeve pipe (10) of screw rod (9) and band internal thread;
During verification, strength tester should be by the calibration of static force value, and with strength tester minimum speed pulling-off force value generation device, the power value that record this moment is standard near static force value with this power value;
Raising speed pulling-off force value generation device, the power value that records and its relatively calculate its error;
Further raising speed pulling-off force value generation device compares its power value error, reaches maximum permissible value until error, and the stretching time of this moment is this strength tester at the minimum rupture time of following sample that can reach of the situation of desired accuracy;
During test, rupture time does not reach accuracy requirement less than the experiment of this time.
2, the method for testing of strength tester dynamic force value measurement accuracy according to claim 1 is characterized in that: the magnetic receiver of power value generation device and magnet all are slidingly mounted in the orienting sleeve (6); And on orienting sleeve (6), being provided with gathering sill, the lower magnet seat is equipped with the pin that can slide on (1) in gathering sill; On the position of orienting sleeve (6), have air hole corresponding to the attraction face.
3, the method for testing of a kind of strength tester dynamic force value measurement accuracy according to claim 1 and 2, it is characterized in that: checking procedure is as follows:
(1), power value generation device is installed:
(a), brace is sandwiched in respectively in the upper and lower holder of strength tester up and down, suitably screws clamper;
(b), with on the power value generation device hook (5) hang over the connection film perforation in, enter experimental state, the strength tester automatic clear;
(c), power value generation device lower draw-bar (8) is hung over down on the brace, screw mandrel (9) value of the exerting all one's strength generation device contraction in length of revolving force value generation device device lower end makes idle running as far as possible little, and install this moment, can test;
(2), strength tester presets and verification
(a), test at strength tester minimum load shelves;
(b), strength tester resets, and draw speed is arranged on minimum speed;
(c), enter test, this moment the strength tester automatic clear, the pre-tension numerical value that added is originally eliminated;
(d), stretch record data, and calculating mean force value 10 times.
(e), power value generation device is motionless, strength tester resets and is reset at constant speed and stretches, draw speed is arranged on a definite value speed;
(f), stretch record data, and calculating mean force value and average rupture time 10 times;
(g), improve the operation that draw speed repeats (e), (f), record power value and test for the first time relatively up to strength tester, judge whether low below the accuracy of setting, the rupture time of record this moment;
(h), if when the strength tester maximal rate, the power value of recording does not drop to below the accuracy of setting yet, it is bigger then the spring in the power value power value generation device should to be replaced by rigidity, test again.
4, implement the power value generation device of the method for testing of the described a kind of strength tester dynamic force value measurement accuracy of claim 1, it is characterized in that: comprise the two blocks of magnet up and down that are fixed on two magnetic receivers, last hook (5) is connected on the magnetic receiver (4), and lower draw-bar (8) is connected the lower end that is installed on the spring (7) in the lower magnet seat (1); The pull bar that lower draw-bar (8) connects spring is divided into two joints of working in coordination, i.e. the sleeve pipe (10) of screw rod (9) and band internal thread; Magnetic receiver and magnet all are slidingly mounted in the orienting sleeve (6); And on orienting sleeve (6), being provided with gathering sill, the lower magnet seat is equipped with the pin that can slide on (1) in gathering sill; On the position of orienting sleeve (6), have air hole corresponding to the attraction face.
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| CN102507358B (en) * | 2011-12-05 | 2013-07-17 | 中铁第五勘察设计院集团有限公司 | Calibrating device of dynamic deformation modulus tester |
| DE102017115732A1 (en) * | 2017-07-13 | 2019-01-17 | GS Elektromedizinische Geräte G. Stemple GmbH | Device for cardiopulmonary massage and / or resuscitation |
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| Title |
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| 利用电磁力检定电子强力仪动态特性的探讨. 杨惠新，袁立新.棉纺织技术，第31卷第12期. 2003 |
| 利用电磁力检定电子强力仪动态特性的探讨. 杨惠新，袁立新.棉纺织技术，第31卷第12期. 2003 * |
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