CN201488919U - Direct tensile test device with hydraulic support - Google Patents

Abstract

The utility model relates to a direct tensile test device with hydraulic support, wherein a stretching device is formed by cascading a group of cylindrical elements which share the same central axis; the tensile test device comprises an upper end cap, a lower end cap, an upper chain, a lower chain, an upper joint and a lower joint, wherein the upper and the lower end caps are used for fixing samples; the upper and the lower chains are respectively connected with the upper and the lower end caps; the upper and the lower joints are respectively connected with the other ends of the upper and the lower chains; and the lower joint is fixed on the base of a testing machine. A support body comprises a hydraulic cylinder filled with liquid and comprises a support cylinder and a measuring cylinder; and the bottom parts of the two cylinders are communicated through a hollow conduit. During the test process, the numerical value of the buoyancy force supplied by hydraulic pressure can be worked out by the height difference of the liquid level variation in the measuring cylinder; and the system error can be reduced through subtracting the numerical value from the stretching data. Besides, the utility model adopts the scheme that the traditional spring is replaced by hydraulic pressure so as to enlarge the measuring range of testing data; and the utility model has more convenient operation, improves the measuring accuracy, and can effectively and promptly protect the test device from being damaged when accidents happen during a tensile test.

Description

The direct tensile test device that a kind of hydraulic pressure supports

Technical field

The utility model relates to the direct tensile test device of hard brittle material, relates in particular to a kind of supporter of this test unit.

Background technology

Nowadays the direct tensile test device is widely used in the tensile mechanical property testing of hard brittle material such as rock, and obviously, test unit is very big to the accuracy influence of determination data, and the sample support body is considered to parts very crucial in the test unit.Hard brittle material, is especially had higher requirement to the sample support body to test unit owing to its special resistance to compression and tension character.The general rigid sleeve that uses is done supporter in traditional test unit, but rigid sleeve has individual defective, when sample is stressed when reaching peak value, under the sample below the destruction face, lower endcaps and the suffered action of gravity of bottom chain, sample takes place to destroy suddenly, test stops, and can not effectively carry out the mensuration of tensile mechanical character behind the peak.In order to address this problem, Chinese patent application number is that 200610022224.8 to disclose a kind of technical scheme be that rigid sleeve is substituted (annex is shown in Figure 1) by support spring 8, like this in whole tension test, support the weight of sample 5 and other test component by spring 8, can finish the mensuration of overall process curve substantially.Yet, after rigid support changes resiliency supported into, will cause new problem.Shown in Figure 1 as annex, before on-test, must make spring generation compression deformation, then mounting spring and lower member thereof (otherwise after on-test, spring will separate with lower endcaps, become the same with rigid support, not have effective supporting).The counter-force that camber of spring provides enters in the data acquisition storehouse by the sensor that is connected in lower clamp.After on-test, sample deforms, and chain can produce certain elongation in the preceding bottom of peak value, and the compression deformation of spring is shunk, and the counter-force that provides is corresponding to be reduced; The elongation of peak value rear lower chain reduces, and the compression deformation of spring strengthens, the corresponding increase of the counter-force that provides, and the counter-force that spring changes enters in the data acquisition storehouse by sensor.This shows that the counter-force that elastic support provides is not a certain value in entire test, when this gives last deal with data, reject this counter-force and reduce systematic error and brought very big difficulty.Because tensile strength of fragile material is low, the fail in tension load is little, so because the systematic error that the spring counter-force produces influence also seems very serious, especially more obvious in the test behind the peak.So this elastic support has had a strong impact on the precision of test figure.In addition, this spring support also can bring following new problems: 1) sample destroys in the end.Sample should destroy in the middle part in theory, but, whole process from tension test, in drawing process, spring and chain can produce double swerve and influence test figure, what especially become in the test near peak stress and behind the peak is more outstanding, causes sample to destroy in the end, does not really reflect the mechanical property of hard brittle material in the stretching overall process; 2) bad adaptability.Specimen size for direct tensile test, standard is not done corresponding regulation, therefore so the volume of sample, weight, tensile strength etc. can differ greatly, the anchorage force to supporter also has different requirements, the sample of breaking easily as small size, just should not use the excessive spring of the coefficient of stiffiness, otherwise there is not difference with rigid support, otherwise, the sample that large volume is not easy to break, also should not use the too small spring of the coefficient of stiffiness, otherwise spring is just ineffective.Therefore to prepare a lot of springs according to different tests, when continuously various sample being done tension test, also will constantly change spring, increase the complicacy of operation; 3) installation procedure complexity.Shown in Figure 1 as annex, from process of the test, when after single test finishes, testing, take down upper and lower cotter joint next time, change test specimen, upper and lower cotter joint is installed then.As can be seen from the figure, lower sub, following latch and chain are all wrapped up by spring, and the spring inner narrow space, the distance between two rings is also very little, brings a lot of inconvenience for the installation of lower member; 4) spring can deform and wear out in long-term use, influences the normal performance of its performance.Based on above reason, be necessary to seek a kind of supporter that overcomes the tensile test apparatus of these defectives of spring, this adverse effect is rejected.

Summary of the invention

The purpose of this utility model is in order to overcome the defective of tensile test apparatus elastic support in the prior art, the direct tensile test device that provides a kind of hydraulic pressure to support.It comprises: the fixedly upper end cap 3 of sample 5 and lower endcaps 6, connect the last chain 2 and the lower chain 9 of two end caps up and down respectively, and with top connection 1 and lower sub 10 that the last lower chain other end links to each other respectively, lower sub is fixed on the tester base 11; Upper end cap 3 and lower endcaps 6, last chain 2 and lower chain 9, top connection 1 and lower sub 10 have common vertical axis and are the layered laminate arrangement.Wherein between lower endcaps and tester base, be provided with the sample support device, described sample support device is made up of a hydraulic pressure cylinder assembly, this hydraulic pressure cylinder assembly comprises the support tube 18 that can keep hydraulic cylinder buoyancy, the measurement tube 16 that can measure hydraulic cylinder buoyancy, in this support tube 18 and the measurement tube 16 liquid 17 that will produce buoyancy is arranged, support tube 18 has hollow tubing conductor to be communicated with measuring between tube 16 bottoms, back up pad 12 is arranged in the support tube 18, measuring in the tube 16 has the check weighing plate 13 that can measure hydraulic floatage, and the outstanding weight 15 that is used to measure hydraulic floatage of rope is arranged at check weighing plate 13 tops; When tension test is carried out, the samples 5 of lower endcaps 6 and top thereof etc. are subjected to keeping balance from the liquid buoyancy in the support tube 18 by back up pad 12, wherein back up pad 12 is close to support tube 18 barrels, and liquid 17 is loaded into buoyancy on the back up pad 12 of top in the sealing support tube 18.Sample deforms in the process of the test, and before peak value, certain elongation also takes place last lower chain thereupon, and back up pad 12 and supporting pad 14 also move up thereupon, and support tube 18 liquid levels rise, and measures tube 16 liquid levels and descends; The elongation strain of lower chain produces certain contraction behind the peak value, and back up pad 12 and supporting pad 14 also move down thereupon, and support tube 18 liquid levels descend, and measures tube 16 liquid levels and rises.In entire test, in the time of the record axial tension, can write down the delta data of the liquid level of support tube 18 and measurement tube 16 with sensor, in the end during the Processing Test data,, back up pad 12 poor and check weighing plate 13 contact liq surface areas, weight 15 weight by liquid level, just can calculate the numerical value that hydraulic pressure provides buoyancy, and it is removed from the stretching data, reduce systematic error.

In the above-mentioned technical scheme, the described lower chain of going up reaches latch 7 down, the dismounting that so also can conveniently go up lower chain with the last latch 4 that is respectively equipped with anti-chain releasing up and down between the end cap.

In the above-mentioned technical scheme, between described back up pad 12 and the lower endcaps 6 supporting pad 14 is arranged, can adopt indeformable rigid material, lower endcaps 6 is fully contacted with supporting pad 14.

In the above-mentioned technical scheme, there is the cylindrical sleeve of a smooth outer surface described lower chain 9 outsides, and are porose on the back up pad 12, and back up pad can be done on this cylindrical sleeve outer wall just and slide up and down, and prevents that liquid 17 from spilling.

In the above-mentioned technical scheme, described measurement tube 16 usefulness transparent materials are made, and axial scale mark is arranged on the barrel, can measure the variation of this interior liquid level, this scale mark direction promptly is vertical shape along the parallel direction of measuring tube 16 walls in test unit, vertical with liquid level.

In the above-mentioned technical scheme, described scale mark also can be a moving scale device, can carry out the correction of zero graduation value when tension test begins, and makes the zero graduation mark and measure tube 16 interior liquid levels identical by regulating the graduator position.So just can directly read the changing value of liquid level, needn't write down liquid level initial value and calculating, can eliminate the personal error in the reading effectively.

In the above-mentioned technical scheme, described moving scale device has zero graduation self-correcting device, this moving scale device has a floating plate 19 to be immersed in the liquid 17 of check weighing plate 13 belows, the handle 20 that connects floating plate 19 passes check weighing plate 13 and can slide up and down, on the handle 20 scale mark is arranged, handle 20 is the zero graduation gauge point with the contact position of floating plate 19, measures to also have moving scale chi locking folder 21 in the tube 16, can pin handle 20 and prevent its slip; When tension test begins, write down the liquid level in support tube 18 and the measurement tube 16, unclamp locking folder 21, floating plate 19 is close to check weighing plate 13 bottoms, the zero graduation gauge point just in time is positioned on the liquid level of measuring tube 16, will lock folder 21 fastenings this moment, and the moving scale device is fixed and no longer slides.In process of the test, to measure tube 16 interior liquid levels and change along with the distortion of sample and chain, graduator can write down the liquid level variation situation.

In the above-mentioned technical scheme, on the moving scale chi handle 20 of described moving scale device movable vernier is arranged, in process of the test, can move freely, can accurately read the height value of measuring liquid level in the tube 16 like this, vernier was positioned at the zero graduation place of handle 20 when tension test began, and can move up and down along handle (20) with check weighing plate (13).

In the above-mentioned technical scheme, described weight 15 is a spring, and this spring upper end is fixing, and the lower end contacts with check weighing plate (13) and compresses.Check weighing plate 13 causes the spring length variations when moving, according to the size of spring length variations, just can calculate the stressed variation of check weighing plate 13, promptly is equivalent to place the weight 15 of Different Weight, uses spring more flexible, adapts to wide.

In the above-mentioned technical scheme, snubber assembly is arranged in the hydraulic cylinder, comprise the cushion pad of lower chain 9 bottoms and the liquid overflow pipe on measurement tube 16 tops.When unscheduled event took place, impulse force was excessive during as sample 5 fracture when exceeding the scope of design that this test unit bears, and cushion pad can effectively be prevented and treated lower endcaps 6 and promote that check weighing plates 13 are fierce to impact lower subs 10, also can cause to measure tube 16 liquid levels and surpass the barrel height.Liquid overflow pipe can make when liquid level surpasses measurement range in measuring tube 16, and liquid 17 can flow to outside the hydraulic cylinder by liquid overflow pipe, prevents that check weighing plate 13 is rushed out measurement tube 16.

The utility model has been obtained following technique effect:

1, in tension test, supporter replaces spring with hydraulic part, can overcome many defectives of spring, yielding as spring long back service time, to change the spring of the corresponding coefficient of stiffiness according to the various sample part, spring is in the unexpected easy vibrations in back etc. of pressurizeing, and these all are unfavorable for the accurate measurement of data, also can cause other problem.Adopt hydraulic support body, just can address these problems;

2, measuring the movable vernier that automatic correct zero scale position is arranged on the tube and write down the liquid level lifting position automatically, can realize the robotization of tension test, intelligent degree, alleviate the hand labor intensity in the test, and effectively improve the degree of accuracy of determination data;

3, the weight of measuring buoyancy in will testing replaces with spring, just needn't change for the different a large amount of weights of sample preparation, has expanded the measurement range of test figure greatly, can be fit to the sample of all kinds of different tensile strength is tested;

4, in the hydraulic cylinder buffer protection device is arranged, can make test meet accident or test when going beyond the scope and provide effective protection test unit.

Description of drawings

Fig. 1 is a direct tensile test apparatus structure synoptic diagram of the prior art;

Fig. 2 is for there being the stretching device structural representation of hydraulic support body in the direct tensile test of the present utility model;

Fig. 3 is the back up pad member stereographic map (amplifying) in the utility model;

Fig. 4 is the vertical view of Fig. 3;

Fig. 5 is the supporting pad stereographic map (amplifying) in the utility model;

Fig. 6 is the vertical view of Fig. 5;

Fig. 7 is the hydraulic cylinder vertical view (amplifying) in the utility model;

Fig. 8 is the measurement tube moving scale device structural representation (amplifying) in the utility model.

Mark among the figure: latch, 8_ support spring, 9_ lower chain, 10_ lower sub, 11_ tester base, 12_ back up pad, 13_ check weighing plate, 14_ supporting pad, 15_ weight, 16_ measure tube, 17_ liquid, 18_ support tube, 19_ moving scale chi floating plate, 20_ moving scale chi scale handle, 21_ moving scale chi locking folder under 1_ top connection, the last chain of 2_, 3_ upper end cap, the last latch of 4_, 5_ sample, 6_ lower endcaps, the 7_.

Embodiment

Understand and enforcement the utility model for the ease of those of ordinary skills, the utility model is described in further detail below in conjunction with the drawings and the specific embodiments.

Fig. 2 is the test unit in the utility model, is divided into stretching device and supporter two large divisions.

Above-mentioned stretching device has the cylindrical element of common center axis to be laminated by one group, comprise: the fixedly upper end cap 3 of sample 5 and lower endcaps 6, connect the last chain 2 and the lower chain 9 of two end caps up and down respectively, with top connection 1 and lower sub 10 that the last lower chain other end links to each other respectively, lower sub is fixed on the tester base 11; Last lower chain and be respectively equipped with the last latch 4 and time latch 7 of anti-chain releasing up and down between the end cap.

Aforesaid supporter is made up of a hydraulic cylinder that liquid 17 is housed, hydraulic cylinder divides two parts (see figure 7), support tube 18 and measurement tube 16, there is hollow tubing conductor to be communicated with between these two tube bottoms, be the hollow tubing conductor formation U-shaped communicating pipe between support tube, hydraulic measurement tube and the bottom thereof, liquid 17 can be flowed freely between two tubes.In the back up pad 12 of reliable hydraulic floatage, the measurement tube 16 the check weighing plate 13 that can measure hydraulic floatage is arranged in the support tube 18 wherein, the back up pad 12 here and the density of check weighing plate 13 are all less than liquid 17 density, therefore float on liquid 17 surfaces, smooth and be close to smooth separately barrel around it, play the effect of seal fluid 17, and along with the fluctuation of liquid in the tube separately can slide up and down.

Can also carry out following improvement to supporter:

1) between above-mentioned back up pad 12 and the lower endcaps 6 lightweight supporting pad 14 is arranged, can adopt indeformable rigid material, lower endcaps 6 is fully contacted with supporting pad 14.

2) there is the cylindrical sleeve of a smooth outer surface above-mentioned lower chain 9 outsides, and porose on the back up pad 12, cylindrical sleeve is passed this hole just, back up pad 12 is done on this cylindrical sleeve outer wall to slide up and down, the inwall in hole also is smooth, and is close to the cylindrical sleeve surface, can prevent that liquid 17 from spilling when sliding.

Embodiment:

In tension test, with upper end cap 3 and fixedly sample 5 and tension of lower endcaps 6, liquid level in the regulator solution cylinder pressure (can realize) from measuring tube 16 injections or extraction liquid, supporting pad 14 is contacted with lower endcaps 6, and adopt the check weighing plate 13 bigger than supporting pad 14 density of material, or other weight that on check weighing plate 13, superposes, make hydraulic cylinder internal buoyancy balance, liquid level is identical in support tube 18 and the measurement tube 16, otherwise two initial liquid level differences of tube influence follow-up test.Above check weighing plate 13, hang weight 15, weight 15 is contacted with check weighing plate 13, but check weighing plate 13 does not bear the weight of weight 15 with tightrope.

Install device, before on-test, write down following data:

1) useful area of back up pad 12 contact liqs 17;

2) useful area of check weighing plate 13 contact liqs 17;

3) density of liquid 17;

4) measure liquid level value, the i.e. height of check weighing plate 13 bottoms in the tube 16;

5) weight 15 weight;

6) lower endcaps 6 weight.

After on-test, sample deforms, before peak value on lower chain certain elongation also takes place thereupon, back up pad 12 and supporting pad 14 also move up thereupon, support tube 18 liquid levels rise, and measure tube 16 liquid levels and descend; The elongation strain of lower chain produces certain contraction behind the peak value, and back up pad 12 and supporting pad 14 also move down thereupon, and support tube 18 liquid levels descend, and measures tube 16 liquid levels and rises.In entire test, in the time of the record axial tension, write down the delta data of the liquid level of support tube 18 and measurement tube 16 with sensor.When off-test aftertreatment data, the weight of, back up pad 12 poor by liquid level and check weighing plate 13 contact liq surface areas, weight 15 just can calculate the numerical value that hydraulic pressure provides buoyancy, and it is removed from the stretching data, reduces systematic error.

In order further to improve the intellectuality and the automaticity of data acquisition in the above-mentioned tension test, alleviate the hand labor intensity in the test, can carry out following improvement to measuring tube 16:

Improvement project 1:

Measuring on the tube 16 has axial scale mark, measures tube 16 and can adopt transparent material, and scale mark is engraved on the barrel, and similar common liquid graduated cylinder can directly be observed the variation of this interior liquid level.

Improvement project 2:

Above-mentioned scale mark can be designed to a moving scale device, as be enclosed within measure barrel one movable ruler, when beginning, tension test can carry out the correction of zero graduation value, regulate the graduator position by sliding up and down, liquid level is identical in making the zero graduation mark and measuring tube 16, the measurement during like this applicable to the arbitrary height liquid level, and the scale on the graduator that liquid level arrives is exactly actual level change height, needn't calculate, directly reading of data.

Improvement project 3:

Above-mentioned moving scale device can be designed to have zero graduation self-correcting device (see figure 8), this moving scale device has a floating plate 19 to be immersed in the liquid 17 of check weighing plate 13 belows, porose on the check weighing plate 13, the hole that the handle 20 of connection floating plate 19 passes on the check weighing plate 13 just can slide up and down, cylindrical sleeve is passed this hole just, back up pad 12 is done on this cylindrical sleeve outer wall to slide up and down, the outside surface of the inwall in hole and handle 20 all is smooth, and be close to mutually, when sliding, can prevent that liquid 17 from spilling.

On the handle 20 scale mark is arranged, handle 20 is the zero graduation gauge point with the contact position of floating plate 19, measures to also have moving scale chi locking folder 21 in the tube 16, can pin handle 20 and prevent its slip; When tension test began, liquid level was identical in support tube 18 and the measurement tube 16, and locking folder 21 unclamps, floating plate 19 is close to check weighing plate 13 bottoms, the zero graduation gauge point just in time is positioned on the liquid level of measuring tube 16, will lock folder 21 fastenings this moment, and the moving scale device is fixed and no longer slides.In test stretches, before the peak value load, measure that liquid levels descend in the tube 16, by the scale mark on the handle 20, just can determine the scale value that liquid level drops to, promptly check weighing plate 13 drops to certain scale on the handle 20 of correspondence bottom it when a bit; Behind the peak value load, because the reducing of lower chain elongation strain, measure that liquid levels rise in the tube 16, by the scale mark on the handle 20, just can determine the scale value that liquid level rises to, promptly check weighing plate 13 rises to certain scale on the handle 20 of correspondence bottom it when a bit.Can show the liquid level variation situation by the variation of moving scale device like this.

In this improvement project, weight 15 also is with holes, can be enclosed within on the handle 20, and the internal diameter in hole must be greater than the cross-sectional diameter of handle 20, to guarantee that weight 15 and 20 of handles can not have friction when sliding.

Improvement project 4:

On the above-mentioned handle that the moving scale line is arranged 20 movable vernier is arranged, can move freely in the process of the test.Vernier was positioned at the zero graduation place of handle 20 when tension test began; After on-test, movable vernier and check weighing plate 13 fix, and then check weighing plate 13 can spur vernier and moves along handle 20, demonstrates the height of level change.

Improvement project 5:

In the above-mentioned technical scheme, weight 15 can be designed to a spring, and this spring upper end is fixing, and the lower end contacts with check weighing plate (13) and compresses.Check weighing plate 13 causes the spring length variations when moving, according to the size of spring length variations, just can calculate the stressed variation of check weighing plate 13, promptly is equivalent to place the weight 15 of Different Weight, uses spring more flexible, adapts to wide.

Improvement project 6:

In tension test, sometimes because of misoperation or because the reason of test specimen itself may cause its unexpected fracture.If the impulse force in when fracture is excessive when exceeding the scope of design that this test unit bears, lower endcaps 6 can promote that back up pads 12 are fierce impacts lower subs 10, causes the damage of relevant parts; Also may cause in addition and measure tube 16 liquid levels, check weighing plate 13 be gone out measured tube 16, and liquid 17 is spilt outside the hydraulic cylinder, therefore the impact mitigation measure that will be necessary above the barrel height.

For addressing the above problem, design has 2 snubber assemblys in the hydraulic cylinder, comprising:

1) cushion pad of lower chain 9 bottoms, cushion pad can alleviate the impact to lower sub 10, prevents that relevant stressed member from damaging,

2) liquid overflow pipe on measurement tube 16 tops, when liquid level surpassed measurement range in measuring tube 16, liquid 17 can flow to outside the hydraulic cylinder by liquid overflow pipe, prevented that check weighing plate 13 is rushed out measurement tube 16.

Claims (10)

1. the direct tensile test device that supports of a hydraulic pressure, it comprises: the fixedly upper end cap (3) of sample (5) and lower endcaps (6), connect the last chain (2) and the lower chain (9) of two end caps up and down respectively, with top connection (1) and lower sub (10) that the last lower chain other end links to each other respectively, lower sub is fixed on the tester base (11); Upper end cap (3) and lower endcaps (6), last chain (2) and lower chain (9), top connection (1) and lower sub (10) have common vertical axis and are the layered laminate arrangement, it is characterized in that: be provided with the sample support device between lower endcaps and the tester base, described sample support device is made up of a hydraulic pressure cylinder assembly, this hydraulic pressure cylinder assembly comprises a support tube (18), a measurement tube (16) of measuring hydraulic cylinder buoyancy, this support tube (18) has liquid (17) with measuring in the tube (16), and support tube (18) has hollow tubing conductor to be communicated with between bottom measuring tube (16), back up pad (12) is arranged in the support tube (18), measure in the tube (16) the check weighing plate (13) that can measure hydraulic floatage is arranged, the outstanding weight that is used to measure hydraulic floatage (15) of rope is arranged at check weighing plate (13) top; When tension test is carried out, the sample (5) of lower endcaps (6) and top thereof is subjected to keeping balance from the liquid buoyancy in the support tube (18) by back up pad (12), wherein back up pad (12) is close to support tube (18) barrel, and the sealing interior liquid of support tube (18) (17) is loaded into buoyancy on the back up pad (12) of top.

2. the direct tensile test device that hydraulic pressure according to claim 1 supports, it is characterized in that at last lower chain be respectively equipped with between the end cap up and down anti-chain releasing on latch (4) reach latch (7).

3. the direct tensile test device that hydraulic pressure according to claim 1 supports is characterized in that between back up pad (12) and the lower endcaps (6) supporting pad (14) being arranged.

4. the direct tensile test device that hydraulic pressure according to claim 1 supports, it is characterized in that there is the cylindrical sleeve of a smooth outer surface described lower chain (9) outside, back up pad (12) goes up porose, can do sliding up and down just on the cylindrical sleeve outer wall, and prevent that liquid (17) from spilling.

5. the direct tensile test device that hydraulic pressure according to claim 1 supports is characterized in that on the described measurement tube (16) axial scale mark being arranged, and can measure the variation of this interior liquid level.

6. the direct tensile test device that hydraulic pressure according to claim 5 supports, it is characterized in that described scale mark is a moving scale device, when tension test begins, can carry out the correction of zero graduation value, make the zero graduation mark identical with measurement tube (16) interior liquid level by regulating the graduator position.

7. the direct tensile test device that hydraulic pressure according to claim 6 supports is characterized in that described moving scale device has zero graduation self-correcting device.

8. the direct tensile test device that hydraulic pressure according to claim 7 supports, it is characterized in that on the moving scale chi handle (20) of described moving scale device movable vernier being arranged, vernier was positioned at handle (20) zero graduation place when tension test began, and can move up and down along handle (20) with check weighing plate (13).

9. the direct tensile test device that hydraulic pressure according to claim 1 supports is characterized in that described weight (15) is a compression spring, and this spring upper end is fixing, and the lower end contacts and is compressed with check weighing plate (13).

10. the direct tensile test device that hydraulic pressure according to claim 1 supports is characterized in that snubber assembly is arranged in the hydraulic cylinder, comprises the cushion pad of lower chain (9) bottom and the liquid overflow pipe on measurement tube (16) top.

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