CN209215110U - A kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material - Google Patents
A kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material Download PDFInfo
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- CN209215110U CN209215110U CN201822151197.5U CN201822151197U CN209215110U CN 209215110 U CN209215110 U CN 209215110U CN 201822151197 U CN201822151197 U CN 201822151197U CN 209215110 U CN209215110 U CN 209215110U
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- screw rod
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- steel
- tensile test
- viscoelastic material
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Abstract
The utility model relates to materials mechanics experimental equipment technical fields, specifically, it is related to a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material, steel base is arranged in parallel with steel top plate and passes through screw rod and connects, loading device is fixedly mounted on steel base, lower platen is mounted on the output end of loading device, the top of lower platen is arranged in top board, pressure acquisition device is fixedly mounted on the top of top board, the working end of displacement measuring device is fixedly connected with lower platen, material test specimen is folded between lower platen and top board, the device can avoid using pressure servo system, the cost of material test specimen viscoplasticity experiment is greatly reduced, it is easy to operate to be conducive to promote in engineering, and the device allows material test specimen to bear the relaxation under different loading speeds, obtain the viscoelasticity characteristic of material, to attach most importance to Civil engineering structure under multiple Under Dynamic Load provides the viscoelastic material parameter being more suitable for.
Description
Technical field
The utility model relates to materials mechanics experimental equipment technical fields, and in particular, to one kind is suitable for viscoplasticity material
The experimental rig of the uniaxial tensile test of material.
Background technique
Uniaxial tensile test is one of the important method of research material mechanical property, and principle is built upon quasi-static mechanics
On the basis of performance.Although the tensile test equipment of metal material, test specimen has developed into ripe with clamp technology, and there has also been correlations
Testing standard, but the tension test of viscoelastic rubber material is still needed further to be developed.
In the fields such as civil engineering, construction material has old often with having a temperature dependency and loading speed dependence
Change feature, these phenomenons of construction material can be described by with viscoelastic parameters.Currently associated specification and engineering practice are substantially all
Viscoelastic parameters are evaluated using creep test, this kind of experiment needs the pressure of constantly adjustment pressure head to guarantee dead load, leads to reality
It tests with high costs and load and there is fluctuation.In addition, creep test is difficult to civil engineering knot after the Under Dynamic Loads such as simulating vehicle load
The springback process of structure.
Chinese patent CN104406853B discloses a kind of test dress of uniaxial tensile test suitable for viscoelastic material
It sets, including dumbbell shape fixture, attachment device and test specimen；One end of dumbbell shape fixture is testing machine connecting hole, and the other end is dumbbell
Type clip slot, one end of attachment device and the shape of dumbbell shape clip slot match, and are embedded in dumbbell shape clip slot, attachment device it is another
End is provided with test specimen link slot, and the both ends of test specimen are fixedly connected in test specimen link slot by epoxide-resin glue, the connection dress at both ends
Set the both ends that test specimen is symmetricly set on dumbbell shape fixture；Test specimen processing cost of the present invention is low, is avoided that between test specimen and fixture
Sliding, can at any time according to test adjust test specimen length, and be avoided that dumbbell shape test specimen changeover portion generate stress collection
In.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of uniaxial tensile test suitable for viscoelastic material
Experimental rig, the device can avoid using pressure servo system, and the cost of material test specimen viscoplasticity experiment, operation letter is greatly reduced
Just be conducive to promote in engineering, and the device allows material test specimen to bear the relaxation under different loading speeds,
The viscoelasticity characteristic of material is obtained, so that the civil engineering structure attached most importance under multiple Under Dynamic Load provides the viscoelastic material being more suitable for
Parameter.
A kind of experimental rig of uniaxial tensile test suitable for viscoelastic material disclosed by the utility model, includes steel
Pedestal, steel top plate, screw rod, loading device, lower platen, top board, pressure acquisition device and displacement measuring device processed, steel bottom
Seat and steel top plate are arranged in parallel, and the top of steel base is arranged in steel top plate, passes through between steel base and steel top plate
Screw rod connection, screw rod are fixedly mounted on the quadrangle of steel base, and steel top plate is slidably mounted on screw rod；
Loading device is fixedly mounted on steel base, and the output end of loading device is arranged vertically upwards, and lower platen is horizontal
It is arranged and is fixedly mounted on the output end of loading device；
The top of lower platen and parallel with lower platen is arranged in top board, and pressure acquisition device is fixedly mounted on top board
Top, the fixing end of pressure acquisition device is fixedly connected with top board, and the working end of pressure acquisition device is connected to steel top
On the bottom surface of plate；
Displacement measuring device is fixedly mounted on screw rod and displacement measuring device is located at the side of loading device, and displacement is surveyed
The working end of amount device is fixedly connected with lower platen；Material test specimen is folded between lower platen and top board.
Further, the quadrangle of steel base is provided with the vertical threaded hole for running through steel base, screw rod and threaded hole spiral shell
Line cooperation.
Further, the two sides of threaded hole are provided with the first nut being set on screw rod, the first nut and screw flight
Connection.
Further, screw rod is arranged and extends to the lower section of steel base through steel base, and the bottom end of screw rod is equipped with
Suspension column.
Further, the quadrangle of steel top plate is provided with and threaded hole one-to-one correspondence and coaxial through-hole, the two sides of through-hole
The second nut being set on screw rod is installed, the second nut is connect with screw flight.
Further, the quadrangle of steel top plate is provided with vertical the first guide sleeve for running through steel top plate, can in the first guide sleeve
Guide post is slidably installed, the mounting hole being slidably matched with guide post is provided on lower platen, is provided on top board sliding with guide post
The pilot hole of dynamic cooperation.
Further, guide post includes the threaded post, guide post and scotch being linked in sequence from top to bottom, guide post and the
One guide sleeve, mounting hole, pilot hole are slidably matched, and the diameter of threaded post is less than the diameter of guide post, and the diameter of scotch is greater than
The diameter of guide post is equipped with nut in threaded post, which is located at the top of 2c and the outer diameter of the nut is greater than guide post
Diameter, scotch is located at the lower section of lower platen and is fixedly connected with lower platen.
Further, the second guide sleeve extended straight down is provided on pilot hole.
Further, the side of lower platen is provided with the convex block extended horizontally outward, and displacement measuring device includes displacement
Meter and fixed frame, displacement meter be fixedly mounted on fixed frame, fixed frame is fixedly mounted on screw rod, the working end of displacement meter with it is convex
Block is fixedly connected.
Further, fixed frame includes horizontally disposed movable plate, and movable plate middle-end is provided with sleeve, sleeve and displacement
Meter is fixedly connected, and movable plate two sides are provided with the through-hole being set on screw rod, and through-hole two sides are provided be set on screw rod
Three nuts, third nut are connect with screw flight.
The utility model has the advantages that apply load upwards to lower platen by loading device so that material test specimen be pressed down plate and
Top board is folded in intermediate receiving load, top board and steel top plate and pressure acquisition device is folded in centre, pressure acquisition dress
The load for setting receiving is identical as material test specimen, so as to calculate the load that material test specimen is being born by pressure acquisition device
Lotus data, while by the degree of displacement of displacement measuring device measurement lower platen, material test specimen shape in load can be calculated
The degree of change.
1. the device can avoid using pressure servo system, the cost of material test specimen viscoplasticity experiment, operation is greatly reduced
Simplicity is conducive to promote in engineering；
2. the device allows material test specimen to bear the relaxation under different loading speeds, the viscoplasticity of material is obtained
Feature, so that the civil engineering structure attached most importance under multiple Under Dynamic Load provides the viscoelastic material parameter being more suitable for.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is the front view of embodiment；
Fig. 2 is the perspective view one of embodiment；
Fig. 3 is the perspective view two of embodiment；
Fig. 4 is the part-structure stereogram exploded view of embodiment；
Fig. 5 is the guide post perspective view of embodiment；
Fig. 6 is the fixed frame perspective view of embodiment；
Description of symbols:
Steel base 1, threaded hole 1a, the first nut 1b, steel top plate 2, through-hole 2a, the second nut 2b, the first guide sleeve 2c,
Guide post 2d, threaded post 2d1, guide post 2d2, scotch 2d3, screw rod 3, suspension column 3a, loading device 4, lower platen 5, mounting hole 5a,
Convex block 5b, material test specimen 6, top board 7, pilot hole 7a, the second guide sleeve 7b, pressure acquisition device 8, displacement measuring device 9, displacement
Count 9a, fixed frame 9b, movable plate 9b1, sleeve 9b2, through-hole 9b3, third nut 9b4.
Specific embodiment
Multiple embodiments that the utility model will be disclosed with schema below, as clearly stated, in many practices
Details will be explained in the following description.It should be appreciated, however, that the details in these practices does not apply this with limitation practical new
Type.That is, the details in these practices is non-essential in some embodiments of the utility model.In addition, for letter
For the sake of changing schema, some known usual structures and component will be painted it in the drawings in simply illustrative mode.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and non-specifically
The meaning of order or cis-position is censured, it is also non-to limit the utility model, it is retouched just for the sake of difference with same technique term
The component stated or operation are not understood to indicate or imply its relative importance or implicitly indicate indicated technology
The quantity of feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not within the protection scope of the requires of the utility model.
Referring to figs. 1 to a kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material shown in fig. 6, include
Steel base 1, steel top plate 2, screw rod 3, loading device 4, lower platen 5, top board 7, pressure acquisition device 8 and displacement measurement dress
9 are set, steel base 1 and steel top plate 2 are arranged in parallel, and the top of steel base 1, steel base 1 and steel is arranged in steel top plate 2
It is connected between top plate 2 processed by screw rod 3, screw rod 3 is fixedly mounted on the quadrangle of steel base 1, and steel top plate 2 is slidably mounted
On screw rod 3；
Loading device 4 is fixedly mounted on steel base 1, and the output end of loading device 4 is arranged vertically upwards, lower platen 5
Output end that is horizontally disposed and being fixedly mounted on loading device 4；Top board 7 be arranged in the top of lower platen 5 and with pushing
Plate 5 is parallel, and pressure acquisition device 8 is fixedly mounted on the top of top board 7, and the fixing end and top board 7 of pressure acquisition device 8 are solid
Fixed connection, the working end of pressure acquisition device 8 is connected on the bottom surface of steel top plate 2；Displacement measuring device 9 is fixedly mounted on spiral shell
On bar 3 and displacement measuring device 9 is located at the side of loading device 4, and the working end of displacement measuring device 9 and lower platen 5 are fixed
Connection；Material test specimen 6 is folded between lower platen 5 and top board 7.
Steel top plate 2 is fixed on screw rod 3 by nut, so that steel base 1, steel top plate 2, screw rod 3 form one
Fixed clamping plate up and down, loading device 4, lower platen 5, material test specimen 6, top board 7 and pressure acquisition device 8 be folded in
Between, loading device 4 is hydraulic jack, and loading device 4 applies load upwards, and material test specimen 6 is pressed down plate 5 and top board 7 presss from both sides
In centre and load is born, pressure acquisition device 8 is DYLF-102 spoke type pressure sensor, and pressure acquisition device 8 is for surveying
The load capacity that loading device 4 exports is measured, displacement measuring device 9 is used to measure the displacement of lower platen 5.
The quadrangle of steel base 1 is provided with the vertical threaded hole 1a for running through steel base 1, screw rod 3 and threaded hole 1a screw thread
Cooperation.Screw rod 3 can thread directly into be fixedly mounted on steel base 1 in threaded hole 1a, install very easy.Threaded hole
The two sides of 1a are provided with the first nut 1b being set on screw rod 3, and the first nut 1b is threadedly coupled with screw rod 3.Pass through rotation the
One nut 1b makes it push against steel base 1, can rotate in threaded hole 1a to avoid screw rod 3 in the course of work.Screw rod 3 runs through steel
Pedestal 1 processed is arranged and extends to the lower section of steel base 1, and the bottom end of screw rod 3 is equipped with suspension column 3a.Suspension column 3a is mounted on screw rod 3
One end for extending to 1 lower section of steel base, so that the device can be placed on suitable table top.
The quadrangle of steel top plate 2 is provided with the two sides peace with threaded hole 1a one-to-one correspondence and coaxial through-hole 2a, through-hole 2a
Equipped with the second nut 2b being set on screw rod 3, the second nut 2b is threadedly coupled with screw rod 3.
Through-hole 2a, which is set on screw rod 3, makes steel top plate 2 parallel with steel base 1, while steel top plate 2 can be in spiral shell
It is slided up and down on bar 3, so that it is pushed against steel top plate 2 from the two sides of steel top plate 2 by rotating the second nut 2b, so that steel
Top plate 2 processed is fixed on screw rod 3.
The quadrangle of steel top plate 2 is provided in vertical the first the guide sleeve 2c, the first guide sleeve 2c for running through steel top plate 2 slidably
Ground is equipped with guide post 2d, and the mounting hole 5a being slidably matched with guide post 2d is provided on lower platen 5, is provided with and leads on top board 7
The pilot hole 7a that column 2d is slidably matched.
Guide post 2d is sequentially connected the first guide sleeve 2c, pilot hole 7a and mounting hole 5a, so that lower platen 5 and top board 7
Be able to be parallel to the setting of steel top plate 2 so that lower platen 5 and top board 7 can relative to steel top plate 2 it is vertical on move down
It is dynamic, to obtain more accurate test result.
Guide post 2d includes the threaded post 2d1, guide post 2d2 and scotch 2d3 being linked in sequence from top to bottom, guide post
2d2 is slidably matched with the first guide sleeve 2c, mounting hole 5a, pilot hole 7a, and the diameter of threaded post 2d1 is straight less than guide post 2d2
Diameter, the diameter of scotch 2d3 are greater than the diameter of guide post 2d2, are equipped with nut on threaded post 2d1, which is located at the upper of 2c
The outer diameter of side and the nut is greater than the diameter of guide post 2d2, and scotch 2d3 is located at the lower section of lower platen 5 and consolidates with lower platen 5
Fixed connection.
Guide post 2d is inserted into mounting hole 5a, so that scotch 2d3 is connected on the bottom surface of mounting hole 5a, it then will be only
Motion block 2d3 welds together with lower platen 5；Then top board 7 is set on guide post 2d2, then guide post 2d is inserted upwardly into
Into the first guide sleeve 2c, nut finally is tightened on threaded post 2d1, prevents guide post 2d from falling from the first guide sleeve 2c, so i.e.
Complete installation.The the second guide sleeve 7b extended straight down is provided on pilot hole 7a.
Second guide sleeve 7b plays the role of guiding 7 glide direction of top board, while the second guide sleeve 7b plays partition lower platen 5
With the effect of top board 7, when material test specimen 6 is taken away between lower platen 5 and top board 7, top board 7 under the effect of gravity from
It so glides and is connected on lower platen 5, the second guide sleeve 7b is first connected on lower platen 5 to prevent top board 7 further at this time
It glides, prevents top board 7 from slipping down to the degree to fit together perfectly with lower platen 5, staff is caused to be difficult to lower platen 5 and upper pressure
Plate 7 separates.
The side of lower platen 5 is provided with the convex block 5b extended horizontally outward, displacement measuring device 9 include displacement meter 9a and
Fixed frame 9b, displacement meter 9a are fixedly mounted on fixed frame 9b, and fixed frame 9b is fixedly mounted on screw rod 3, the work of displacement meter 9a
Make end to be fixedly connected with convex block 5b.Displacement meter 9a is the bright KTC2-50mm pull rod linear displacement transducer of rice, and displacement meter 9a is for examining
The moving distance of lower platen 5 is surveyed, to calculate the degree of the deformation in load of material test specimen 6.
Fixed frame 9b includes horizontally disposed movable plate 9b1, and movable plate 9b1 middle-end is provided with sleeve 9b2, sleeve 9b2
It is fixedly connected with displacement meter 9a, the two sides movable plate 9b1 are provided with the through-hole 9b3 being set on screw rod 3, the setting of the two sides through-hole 9b3
There are the third nut 9b4 being set on screw rod 3, third nut 9b4 to be threadedly coupled with screw rod 3.It can by rotation third nut 9b4
The position of the above lower adjustment movable plate 9b1, then tightening third nut 9b4 makes its abutting movable plate 9b1 that can fix fixed frame
The height of 9b.
Working principle: load is applied to lower platen 5 by loading device 4 upwards, so that material test specimen 6 is pressed down plate
5 and top board 7 be folded in it is intermediate bear load, pressure acquisition device 8 is folded in centre, pressure by top board 7 and steel top plate 2
The load that acquisition device 8 is born is identical as material test specimen 6, so as to calculate material test specimen 6 just by pressure acquisition device 8
In the load data of receiving, while by the degree of displacement of the measurement lower platen 5 of displacement measuring device 9, material examination can be calculated
The degree of the deformation in load of part 6.
Upper described only the embodiments of the present invention, is not intended to limit the utility model.For this field
For technical staff, various modifications and changes may be made to the present invention.The interior institute of all spirit and principle in the utility model
Any modification, equivalent substitution, improvement and etc. of work should all include within the scope of the claims of the utility model.
Claims (10)
1. a kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material, it is characterised in that: include steel base
(1), steel top plate (2), screw rod (3), loading device (4), lower platen (5), top board (7), pressure acquisition device (8) and displacement
Measuring device (9), steel base (1) and steel top plate (2) are arranged in parallel, and steel top plate (2) is arranged in the upper of steel base (1)
Side, is connected between steel base (1) and steel top plate (2) by screw rod (3), and screw rod (3) is fixedly mounted on steel base (1)
Quadrangle, steel top plate (2) are slidably mounted on screw rod (3)；
Loading device (4) is fixedly mounted on steel base (1), and the output end of loading device (4) is arranged vertically upwards, lower platen
(5) it is horizontally disposed with and is fixedly mounted on the output end of loading device (4)；
The top in lower platen (5) and, pressure acquisition device (8) fixed installation parallel with lower platen (5) is arranged in top board (7)
In the top of top board (7), the fixing end of pressure acquisition device (8) is fixedly connected with top board (7), pressure acquisition device (8)
Working end be connected on the bottom surface of steel top plate (2)；
Displacement measuring device (9) is fixedly mounted on screw rod (3) and displacement measuring device (9) is located at the side of loading device (4)
The working end of side, displacement measuring device (9) is fixedly connected with lower platen (5)；It is folded between lower platen (5) and top board (7)
Material test specimen (6).
2. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 1, feature
Be: the quadrangle of steel base (1) is provided with the vertical threaded hole (1a) for running through steel base (1), screw rod (3) and threaded hole
(1a) is threadedly engaged.
3. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 2, feature
Be: the two sides of threaded hole (1a) are provided with the first nut (1b) being set on screw rod (3), the first nut (1b) and screw rod
(3) it is threadedly coupled.
4. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 1, feature
Be: screw rod (3) is arranged through steel base (1) and extends to the lower section of steel base (1), and the bottom end of screw rod (3) is equipped with
Suspension column (3a).
5. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 2, feature
Be: the quadrangle of steel top plate (2) is provided with to be corresponded and coaxial through-hole (2a) with threaded hole (1a), and the two of through-hole (2a)
Side is equipped with the second nut (2b) being set on screw rod (3), and the second nut (2b) is threadedly coupled with screw rod (3).
6. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 1, feature
Be: the quadrangle of steel top plate (2) is provided with vertical the first guide sleeve (2c) for running through steel top plate (2), in the first guide sleeve (2c)
It is slidably mounted with guide post (2d), the mounting hole (5a) being slidably matched with guide post (2d), top board is provided on lower platen (5)
(7) pilot hole (7a) being slidably matched with guide post (2d) is provided on.
7. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 6, feature
Be: guide post (2d) includes the threaded post (2d1), guide post (2d2) and scotch (2d3) being linked in sequence from top to bottom, is led
Xiang Zhu (2d2) is slidably matched with the first guide sleeve (2c), mounting hole (5a), pilot hole (7a), and the diameter of threaded post (2d1) is less than
The diameter of guide post (2d2), the diameter of scotch (2d3) are greater than the diameter of guide post (2d2), are equipped in threaded post (2d1)
Nut, which is located at the top of 2c and diameter of the outer diameter greater than guide post (2d2) of the nut, scotch (2d3) are located at
The lower section of lower platen (5) is simultaneously fixedly connected with lower platen (5).
8. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 6, feature
It is: is provided with the second guide sleeve (7b) extended straight down on pilot hole (7a).
9. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 1, feature
Be: the side of lower platen (5) is provided with the convex block (5b) extended horizontally outward, and displacement measuring device (9) includes displacement meter
(9a) and fixed frame (9b), displacement meter (9a) are fixedly mounted on fixed frame (9b), and fixed frame (9b) is fixedly mounted on screw rod (3)
On, the working end of displacement meter (9a) is fixedly connected with convex block (5b).
10. a kind of experimental rig of uniaxial tensile test suitable for viscoelastic material according to claim 9, feature
Be: fixed frame (9b) includes horizontally disposed movable plate (9b1), and movable plate (9b1) middle-end is provided with sleeve (9b2), set
Cylinder (9b2) is fixedly connected with displacement meter (9a), and the two sides movable plate (9b1) are provided with the through-hole (9b3) being set on screw rod (3),
The two sides through-hole (9b3) are provided with the third nut (9b4) being set on screw rod (3), third nut (9b4) and screw rod (3) screw thread
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822151197.5U CN209215110U (en) | 2018-12-18 | 2018-12-18 | A kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822151197.5U CN209215110U (en) | 2018-12-18 | 2018-12-18 | A kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material |
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| Publication Number | Publication Date |
|---|---|
| CN209215110U true CN209215110U (en) | 2019-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822151197.5U Expired - Fee Related CN209215110U (en) | 2018-12-18 | 2018-12-18 | A kind of experimental rig of the uniaxial tensile test suitable for viscoelastic material |
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| CN (1) | CN209215110U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320106A (en) * | 2019-08-12 | 2019-10-11 | 山西煤矿机械制造股份有限公司 | A kind of dumbbell pin factory strength test device |
| CN114323989A (en) * | 2021-12-02 | 2022-04-12 | 泰安路德工程材料有限公司 | Tensile detection device based on geotechnical material |
-
2018
- 2018-12-18 CN CN201822151197.5U patent/CN209215110U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320106A (en) * | 2019-08-12 | 2019-10-11 | 山西煤矿机械制造股份有限公司 | A kind of dumbbell pin factory strength test device |
| CN114323989A (en) * | 2021-12-02 | 2022-04-12 | 泰安路德工程材料有限公司 | Tensile detection device based on geotechnical material |
| CN114323989B (en) * | 2021-12-02 | 2023-11-21 | 泰安路德工程材料有限公司 | Stretching detection device based on geotechnical material |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20190806 Termination date: 20191218 |