CN107941600A - A kind of buffer unit for composite material tension test - Google Patents
A kind of buffer unit for composite material tension test Download PDFInfo
- Publication number
- CN107941600A CN107941600A CN201711313774.XA CN201711313774A CN107941600A CN 107941600 A CN107941600 A CN 107941600A CN 201711313774 A CN201711313774 A CN 201711313774A CN 107941600 A CN107941600 A CN 107941600A
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- buffer unit
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- 238000012360 testing method Methods 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000004154 testing of material Methods 0.000 abstract description 16
- 230000003139 buffering effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000009864 tensile test Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009527 percussion Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
Abstract
The present invention provides a kind of buffer unit for composite material tension test, including：Main body box, first order top plate and second level top plate；The upper center of main body box is provided with fork, is provided with through hole in the middle part of lower end, is internally provided with cavity；First order top plate is arranged in the cavity, its bottom surface is provided with lower fork；Bottom of the lower fork through the through hole on main body box from main body box is stretched out；At least two first order springs are provided with first order top plate；The both ends of first order spring are connected with the upper surface of first order top plate and the top of cavity inner wall respectively；Second level top plate is arranged on the top of first order top plate；At least two second level springs are provided with the top plate of the second level；The both ends of second level spring are connected with the upper surface of second level top plate and the top of cavity inner wall respectively.The impact force that can effectively avoid the upper grip of Material Testing Machine using the present invention causes test specimen damage or even destroys.
Description
Technical field
This application involves composite material tension test technical field, more particularly to it is a kind of for composite material tension test
Buffer unit.
Background technology
In material tensile test for composite, non-damaging test method can be used to carry out tension test.Above-mentioned non-damage
The core for hindering test method is：Within whole digestion period, the test of elasticity modulus is carried out using identical test sample.Cause
This, it is ensured that it is key whether success of the test successfully that test specimen is not destroyed during tension test.
In the prior art, tension test usually is carried out to composite material using Material Testing Machine.Fig. 1 is the prior art
In material tensile test for composite when device connection diagram.As shown in Figure 1, the upper grip 12 of Material Testing Machine and experiment
Machine counter-force crossbeam 11 is fixedly connected；The lower collet 13 of Material Testing Machine is fixed on base 14；Testing machine counter-force crossbeam 11 and bottom
Seat 14 jacks column 15 by testing machine and connects.
In material tensile test for composite, the upper grip 12 of Material Testing Machine and lower collet 13 clamp sample 10 respectively
Both ends；Then, the upper grip 12 of Material Testing Machine slowly rises, there is provided and power is drawn high accordingly, and sample 10 is stretched, from
And carry out corresponding tension test.
In the prior art, often used Material Testing Machine (for example, universal testing machine) can be realized a certain
Provide that automatic or manual stops when deformation values or value of thrust.But when carrying out above-mentioned composite material tension test, when material tries
When the machine of testing reaches specified pulling force and stops, testing machine counter-force crossbeam 11 and lower collet 13 will stop immediately, and upper grip 12 due to
The reason for inertia, will also continue to drive sample 10 to move upwards.Moreover, when upper grip 12 is from when being pulled up state and stopping suddenly,
Upper grip 12 will produce sample 10 larger impact force.The impact force often causes to damage to test specimen, or even destroys test specimen,
So as to cause the failure of composite material tension test.
Thus, it can be known that the impact force for how being effectively prevented from above-mentioned upper grip causes test specimen damage or even destroys,
Through as a urgent problem needed to be solved in this area.
The content of the invention
In view of this, the present invention provides a kind of buffer unit for composite material tension test, so as to effective
Ground avoids the impact force of the upper grip of Material Testing Machine from causing damage to test specimen or even destroy.
What technical scheme was specifically realized in：
A kind of buffer unit for composite material tension test, the buffer unit include：Main body box, first order top plate and
Second level top plate；
The upper center of the main body box is provided with fork；Through hole is provided with the middle part of the lower end of the main body box；Institute
That states main body box is internally provided with cavity；
The first order top plate is arranged in the cavity, and the bottom surface of the first order top plate is provided with lower fork；Institute
Bottom of the lower fork through the through hole on the main body box from the main body box is stated to stretch out；It is provided with the first order top plate
At least two first order springs；The both ends of the first order spring upper surface with the first order top plate and the sky respectively
The top connection of cavity wall；
The second level top plate is arranged on the top of the first order top plate, and at least two are provided with the second level top plate
Root second level spring；The both ends of the second level spring upper surface with the second level top plate and the cavity inner wall respectively
Top connection.
Preferably, still further comprised in the buffer unit：Third level top plate；
The third level top plate is arranged on the top of the second level top plate, and at least two are provided with third level top plate
Three-level spring；The both ends of the third level spring respectively with the upper surface of the third level top plate and the top of the cavity inner wall
Portion connects.
Preferably, displacement confinement block is provided with the top of the cavity inner wall of the main body box of the buffer unit.
Preferably, in addition to first order top plate, the both ends of other top plates at different levels pass through drag-line and the cavity inner wall respectively
Top connects.
Preferably, the both ends of the first order top plate are respectively arranged with least one bayonet lock；
Card slot corresponding with the bayonet lock is respectively arranged with the two side walls of the cavity.
Preferably, each spring in springs at different levels is symmetrical each along the length direction of the main body box.
Preferably, 4 first order springs are provided with the first order top plate；
2 second level springs are provided with the second level top plate；
2 third level springs are provided with the third level top plate.
Preferably, the first pin hole passed through for latch is additionally provided with the upper fork.
Preferably, the bottom of the lower fork is provided with the accommodating chamber for upper grip insertion；The lower fork
On be additionally provided with the second pin hole passed through for latch.
As above as it can be seen that in the buffer unit for composite material tension test in the present invention, since there is provided at different levels
Top plate and spring at different levels, therefore there is good energy absorption capability, i.e., it is i.e. absorbable many after the displacement Jing Guo very little
Impact energy, so as to effectively to Material Testing Machine stop caused by percussion play good cushioning effect,
It can effectively prevent the upper grip of Material Testing Machine from being caused from the percussion being pulled up when state stops suddenly to test specimen
Damage, but also to avoid because of excessive buffer distance sample can be destroyed.
Brief description of the drawings
Fig. 1 be in the prior art material tensile test for composite when device connection diagram.
Fig. 2 is the schematic diagram of the Material Testing Machine for being provided with buffer unit in the embodiment of the present invention.
Fig. 3 is the schematic perspective view of the buffer unit in the embodiment of the present invention.
Fig. 4 is the top view of the buffer unit in the embodiment of the present invention.
Fig. 5 is the vertical profile figure of the buffer unit in the embodiment of the present invention.
Fig. 6 is the transverse cross-sectional view of the buffer unit in the embodiment of the present invention.
Fig. 7 is that the vertical view contrast of the first order top plate, second level top plate and third level top plate in the embodiment of the present invention is illustrated
Figure.
Fig. 8 be the embodiment of the present invention in buffer unit in first order groups of springs by compression second and third grade of groups of springs
Schematic diagram when being uncompressed.
Fig. 9 be the embodiment of the present invention in buffer unit in first and second grade of groups of springs by compression third level groups of springs
Schematic diagram when being uncompressed.
Figure 10 is schematic diagram when first, second and third grade of groups of springs in the buffer unit in the embodiment of the present invention is compressed.
Figure 11 is showing when first, second and third grade of groups of springs in the buffer unit in the embodiment of the present invention is compressed completely
It is intended to.
Embodiment
For technical scheme and advantage is more clearly understood, below in conjunction with drawings and the specific embodiments, to this
Invention is described in further detail.
Pull head causes test specimen from the percussion being pulled up when state stops suddenly damage or even destroys in order to prevent
Test specimen, a kind of buffer unit for composite material tension test is proposed in of the invention.
Fig. 3 is the schematic perspective view of the buffer unit in the embodiment of the present invention, and Fig. 4 is the buffering dress in the embodiment of the present invention
The top view put, Fig. 5 are the vertical profile figure of the buffer unit in the embodiment of the present invention, and Fig. 6 is slow in the embodiment of the present invention
The transverse cross-sectional view of flushing device.As illustrated in figures 3-6, the buffering for composite material tension test in the embodiment of the present invention fills
Put including：Main body box 51, first order top plate 21 and second level top plate 22；
The upper center of the main body box 51 is provided with fork 511；It is provided with the middle part of the lower end of the main body box 51
Through hole；The main body box 51 is internally provided with cavity 510；
The first order top plate 21 is arranged in the cavity 510, and the bottom surface of the first order top plate 21 is provided with underthrust
Plunger 211；Bottom of the lower fork 211 through the through hole on the main body box 51 from the main body box 51 is stretched out；It is described
At least two first order springs 31 are provided with first order top plate 21；The both ends of the first order spring 31 are respectively with described first
The top connection of 510 inner wall of upper surface and the cavity of level top plate 21；
The second level top plate 22 is arranged on the top of the first order top plate 21, the both ends point of the second level top plate 22
It is not connected by the second drag-line 42 with the top of 510 inner wall of cavity；At least two are provided with the second level top plate 22
Second level spring 32；The both ends of the second level spring 32 upper surface with the second level top plate 22 and the cavity respectively
The top connection of 510 inner walls.
In the above-mentioned buffer unit for composite material tension test, in the cavity 510 of the main body box 51
In be provided with two-stage top plate：First order top plate 21 and second level top plate 22.
In the inventive solutions, can be according to the needs of practical situations, in the sky of the main body box
N (N >=2) level top plate is set in chamber, and the wherein value of N can be preset according to the needs of practical situations.
Can be with for example, preferably, as shown in figure 5, in one particular embodiment of the present invention, in above-mentioned buffer unit
Further comprise：Third level top plate 23；
The third level top plate 23 is arranged on the top of the second level top plate 22, is provided with least on third level top plate 23
Two third level springs 33；The both ends of the third level spring 33 respectively with the upper surface of the third level top plate 23 and described
The top connection of 510 inner wall of cavity.
At this time, it is provided with three-level top plate in the buffer unit for composite material tension test in the present invention：The first order
Top plate 21, second level top plate 22 and third level top plate 23.
Set the situation of M (M >=4) level top plate can be with the rest may be inferred, herein no longer in the cavity of the main body box
Enumerate.
Fig. 2 is the schematic diagram of the Material Testing Machine for being provided with buffer unit in the embodiment of the present invention.Fig. 8~Figure 11 is this
The fundamental diagram in buffer unit in inventive embodiments, as shown in Fig. 2, Fig. 8~Figure 11, above-mentioned buffering in the present invention
In device, the upper fork 511 on aforementioned body box 51 can be connected with testing machine counter-force crossbeam 11, and the first order top plate
Lower fork 211 on 21 can be then connected with the upper grip 12 of Material Testing Machine.Therefore, in material tensile test for composite
When, the upward pulling force of testing machine counter-force crossbeam 11 can be delivered to first order top plate by the main body box of above-mentioned buffer unit
21, and drive the sample 10 clamped by upper grip 12 to move upwardly together, complete set stretching task.When the predetermined stretching of completion
Afterwards, Material Testing Machine stops, and testing machine counter-force crossbeam 11 drives the main body box 51 of above-mentioned buffer unit also to stop immediately.But
It is that, due to effect of inertia, first order top plate 21, upper grip 12 and test specimen 10 in above-mentioned buffer unit still may proceed to moving up
It is dynamic.At this time, the above-mentioned buffer unit in the present invention will start to play a role.To be provided with three-level top plate in above-mentioned buffer unit
Exemplified by (i.e. above-mentioned N=3), the buffering overall process of above-mentioned buffer unit can have three buffering courses, such as Fig. 8~Figure 10 institutes
Show.
For example, in first buffering course shown in Fig. 8, since upper grip continues to move up, first order top
Plate 21 will also continue to move up therewith, and first order spring 31 will be compressed first, with the upward impact force to upper grip 12
Into row buffering.
When first order top plate 21, which is moved to, to be in contact with second level top plate 22, if upper grip is also continuing up shifting
It is dynamic, then it will enter second buffering course shown in Fig. 9；At this time, second level top plate 22 is by under the promotion of first order top plate 21
Also begin to move up, first order spring 31 continues to be compressed, and second level spring 32 also begins to be compressed, with to upper grip 12
Upward impact force continue to buffer.
When second level top plate 22, which is moved to, to be in contact with third level top plate 23, if upper grip is also continuing up shifting
It is dynamic, then it will enter the 3rd buffering course shown in Figure 10；At this time, third level top plate 23 is by under the promotion of second level top plate 22
Also begin to move up, first order spring 31 and second level spring 32 continue to be compressed, and third level spring 33 also begins to be pressed
Contracting, continues to buffer, can be fully compressed up to third level spring 33 with the upward impact force to upper grip 12, such as schemes
Shown in 11.
In three above-mentioned buffering courses, with moving up for upper grip 12, first order spring 31, second level spring
32 and third level spring 33 will be compressed successively, therefore, the energy that upper grip 12 is produced due to inertia also will be gradually consumed.
If the speed (i.e. rate of extension) that upper grip 12 moves up is smaller, upper grip 12 is likely in 33 quilt of third level spring
I.e. stopping moves up before compression completely, it is achieved thereby that the buffering effect moved up to upper grip 12 under effect of inertia
Fruit, and upward displacement is smaller；Moreover, even if the speed (i.e. rate of extension) that moves up of upper grip 12 is larger, pass through three
Three-level spring in a buffering course compression energy consumption, the speed that upper grip 12 moves up can also be down to very little so that
Sample 10 can not damaged again.
Certainly, in the inventive solutions, in order to further prevent that sample 10 is larger and destroyed due to deforming, compared with
Good, in one particular embodiment of the present invention, can also be at the top of the cavity inner wall of the main body box of the buffer unit
Displacement confinement block 513 is set.Therefore, when third level top plate 23, which is moved to, to be in contact with the displacement confinement block 513, the 3rd
Level top plate 23 will stop, so that upper grip 12 is finally also stopped after the energy consumption of three-level spring, so as to
Effectively prevent that sample 10 is larger and destroyed due to deforming.
Above is to be provided with three-level top plate (i.e. first order top plate, second level top plate and the third level in above-mentioned buffer unit
Top plate) exemplified by, the operation principle of the buffer unit in the present invention is described.When there is provided N grades in the buffer unit
During top plate, its operation principle can will not enumerate herein with the rest may be inferred.
In addition, preferably, in a specific embodiment of the present invention, in addition to first order top plate, the both ends of other top plates at different levels
It is connected respectively by drag-line with the top of the cavity inner wall.
For example, as shown in figure 5, when being provided with three-level top plate in above-mentioned buffer unit, the second level top plate 22
Both ends are connected by drag-line 42 with the top of 510 inner wall of cavity respectively；The both ends of the third level top plate 23 pass through respectively
Drag-line 43 is connected with the top of 510 inner wall of cavity.
Therefore, in the inventive solutions, when other springs at different levels in addition to first order spring in buffer unit
When (for example, second level spring and third level spring) is in relaxation state (being uncompressed), its in addition to first order top plate
Its top plate (for example, second level top plate and third level top plate) at different levels is suspended in the cavity 510 by the drag-line at both ends, from
And it can ensure other springs at different levels in addition to first order spring and be in free state.
In addition, preferably, in a specific embodiment of the present invention, the both ends of the first order top plate 21 be respectively arranged with to
A few bayonet lock 213；Card slot 514 corresponding with the bayonet lock is respectively arranged with the two side walls of the cavity 510.
Therefore, the bayonet lock 213 at 21 both ends of first order top plate can be caught in above-mentioned card slot 514 so that described first
The plate face of level top plate 21 can remain horizontal during moving up and down.
In addition, preferably, in a specific embodiment of the present invention, even if when the first order top plate 21 is not affected by upper grip
During 12 upward impulse force, the first order spring 31, which remains on, may be at compressive state, so that described first
Level top plate 21 closely abuts under the action of power in shoring for the first order spring 31 with the bottom of 510 inner wall of cavity.
In addition, in the inventive solutions, springs at different levels can be pre-set according to the needs of practical situations
Quantity and/or position.
For example, preferably, in a specific embodiment of the present invention, 4 first order are provided with the first order top plate 21
Spring 31；2 second level springs 32 are provided with the second level top plate 22；2 are provided with the third level top plate 23
Three-level spring 33.
For example, preferably, in a specific embodiment of the present invention, each spring in springs at different levels is each along the main body
The length direction of box is symmetrical.
In addition, preferably, in a specific embodiment of the present invention, it is additionally provided with the upper fork 511 and is worn for latch
The first pin hole 512 crossed.
Therefore, the upper fork 511 may be inserted into the interface on testing machine counter-force crossbeam 11, then be inserted again first
Latch is inserted into pin hole 512, the upper fork 511 is fastened on testing machine counter-force crossbeam 11.
In addition, preferably, in a specific embodiment of the present invention, the bottom of the lower fork 211 is provided with described in confession
The accommodating chamber that upper grip 12 is inserted into；The second pin hole 212 passed through for latch is additionally provided with the lower fork 211.
Therefore, the upper grip 12 may be inserted into the accommodating chamber of the lower fork 211, then again by latch insertion the
In pin hole in two pin holes 212 and on the upper grip 12, the lower fork 211 is fastened on material examination
Test on the upper grip 12 of machine.
In conclusion in the inventive solutions, due to being filled in the above-mentioned buffering for composite material tension test
In putting, there is provided top plates at different levels and spring at different levels, therefore there is good energy absorption capability, i.e., the displacement Jing Guo very little it
I.e. absorbable many impact energys afterwards, so as to effectively be played very to percussion caused by Material Testing Machine stopping
Good cushioning effect, can effectively prevent the upper grip of Material Testing Machine from making from the impact being pulled up when state stops suddenly
Cause to damage with to test specimen, but also to avoid because of excessive buffer distance sample can be destroyed.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of protection of the invention.
Claims (9)
1. a kind of buffer unit for composite material tension test, it is characterised in that the buffer unit includes：Main body box,
Level-one top plate and second level top plate；
The upper center of the main body box is provided with fork；Through hole is provided with the middle part of the lower end of the main body box；The master
Body box is internally provided with cavity；
The first order top plate is arranged in the cavity, and the bottom surface of the first order top plate is provided with lower fork；Under described
Bottom of the fork through the through hole on the main body box from the main body box is stretched out；It is provided with least on the first order top plate
Two first order springs；The both ends of the first order spring respectively with the upper surface of the first order top plate and the cavity
The top connection of wall；
The second level top plate is arranged on the top of the first order top plate, and at least two are provided with the second level top plate
Two-level spring；The both ends of the second level spring respectively with the upper surface of the second level top plate and the top of the cavity inner wall
Portion connects.
2. buffer unit according to claim 1, it is characterised in that still further comprised in the buffer unit：3rd
Level top plate；
The third level top plate is arranged on the top of the second level top plate, and at least two third level are provided with third level top plate
Spring；The both ends of the third level spring at the top of the upper surface of the third level top plate and the cavity inner wall respectively with connecting
Connect.
3. buffer unit according to claim 1 or 2, it is characterised in that：
Displacement confinement block is provided with the top of the cavity inner wall of the main body box of the buffer unit.
4. buffer unit according to claim 1 or 2, it is characterised in that：
In addition to first order top plate, the both ends of other top plates at different levels are connected by drag-line with the top of the cavity inner wall respectively.
5. buffer unit according to claim 1 or 2, it is characterised in that：
The both ends of the first order top plate are respectively arranged with least one bayonet lock；
Card slot corresponding with the bayonet lock is respectively arranged with the two side walls of the cavity.
6. buffer unit according to claim 1 or 2, it is characterised in that：
Each spring in springs at different levels is symmetrical each along the length direction of the main body box.
7. buffer unit according to claim 2, it is characterised in that：
4 first order springs are provided with the first order top plate；
2 second level springs are provided with the second level top plate；
2 third level springs are provided with the third level top plate.
8. buffer unit according to claim 1 or 2, it is characterised in that：
The first pin hole passed through for latch is additionally provided with the upper fork.
9. buffer unit according to claim 1 or 2, it is characterised in that：
The bottom of the lower fork is provided with the accommodating chamber for upper grip insertion；Confession is additionally provided with the lower fork
The second pin hole that latch passes through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313774.XA CN107941600B (en) | 2017-12-12 | 2017-12-12 | Buffer device for composite material tensile test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313774.XA CN107941600B (en) | 2017-12-12 | 2017-12-12 | Buffer device for composite material tensile test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107941600A true CN107941600A (en) | 2018-04-20 |
| CN107941600B CN107941600B (en) | 2024-03-29 |
Family
ID=61945595
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711313774.XA Active CN107941600B (en) | 2017-12-12 | 2017-12-12 | Buffer device for composite material tensile test |
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| Country | Link |
|---|---|
| CN (1) | CN107941600B (en) |
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| CN111175133A (en) * | 2020-01-13 | 2020-05-19 | 江苏华脉新材料有限公司 | Tension testing machine for pre-twisted hardware fitting |
| CN111766132A (en) * | 2020-07-15 | 2020-10-13 | 华北水利水电大学 | Metal mesh tensile quality detection device and operation method thereof |
| CN112857985A (en) * | 2021-02-08 | 2021-05-28 | 浙江义宇仪器设备有限公司 | Universal material testing machine |
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| CN111175133B (en) * | 2020-01-13 | 2021-04-09 | 江苏华脉新材料有限公司 | Tension testing machine for pre-twisted hardware fitting |
| CN111766132A (en) * | 2020-07-15 | 2020-10-13 | 华北水利水电大学 | Metal mesh tensile quality detection device and operation method thereof |
| CN112857985A (en) * | 2021-02-08 | 2021-05-28 | 浙江义宇仪器设备有限公司 | Universal material testing machine |
| CN112857985B (en) * | 2021-02-08 | 2023-11-17 | 浙江义宇仪器设备有限公司 | Universal material testing machine |
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| CN107941600B (en) | 2024-03-29 |
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