CN107271288A - Ton load testing machine moving beam lifting system - Google Patents
Ton load testing machine moving beam lifting system Download PDFInfo
- Publication number
- CN107271288A CN107271288A CN201710312310.0A CN201710312310A CN107271288A CN 107271288 A CN107271288 A CN 107271288A CN 201710312310 A CN201710312310 A CN 201710312310A CN 107271288 A CN107271288 A CN 107271288A
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- China
- Prior art keywords
- moving beam
- beam lifting
- testing machine
- load testing
- cylinder
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- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
Abstract
The invention discloses a kind of ton load testing machine moving beam lifting system, moving beam lifting system includes：Four moving beam lifting hydraulic cylinders and fluid power system；The cylinder barrel of moving beam lifting hydraulic cylinder is connected by cylinder barrel fixture with back timber, and the lower end of piston rod is connected by the bottom of piston joint element for bar and moving beam；The cavity for being used for accommodating cylinder barrel is provided with moving beam；Every group of moving beam lifting hydraulic cylinder is mounted on displacement transducer and pressure sensor；Fluid power system is used to drive moving beam lifting hydraulic cylinder to run.The ton load testing machine moving beam lifting system that the present invention is provided, can realize that to vertically move continuous stepless in space adjustable.Whole system is simple to operate, and automaticity is high；Overload protection is easily realized in hydraulic drive, and Hydraulic Elements energy lubricating by oneself, system service life is long.Because Hydraulic Elements realize seriation, standardization and generalization, manufacture, operation and maintenance are all more convenient.
Description
Technical field
The invention belongs to large-scale building component and rubber test piece pressure testing device technical field, more particularly to one kind ten thousand
Tonne load testing machine moving beam lifting system.
Background technology
With the development of urban construction, skyscraper increases increasingly, for the side such as rigidity, intensity and antidetonation of building structure
Face requires more and more higher, urgently needs super-heavy load, the testing equipment of extra space structure.Moving beam and column, pedestal and
Together, the loading height space of continuously adjustabe can be realized to weighted platform by forming one, disclosure satisfy that the test specimen institute of various sizes
The optimum test space needed.When carrying out static test specimen and dynamic loading test, it is necessary to which one kind can drive moving beam perpendicular
Nogata is realized and connected in the range of force self-balanced mechanical framework height space including moving beam to quick, smoothly a wide range of mobile
Continue adjustable lifting system.Synchronous control system is as follows in current moving beam lifting process.
Mechanical synchronization control system, using mechanical constraint component by multiple hydraulic cylinders it is rigid to connect realization synchronous.
Its advantage is that simple in construction, reliability is high；It has the disadvantage in the case where unbalance loading is too big, it may appear that stuck phenomenon.
Hydraulically balanced valve synchronous control system, the fuel supply flow rate of each oil cylinder is controlled by hydraulically balanced valve, so as to realize
Multiple hydraulic cylinders synchronization action, synchronization accuracy depends primarily on the correlated performance of related Hydraulic Elements and fluid, due to using
Opened loop control, so hydraulically balanced valve synchronous control system is mainly used in synchronization accuracy requirement less high occasion.At present,
Moving beam lifting system is generally realized using hydraulically balanced valve synchronous control technique in domestic and international Material Testing Machine.
The content of the invention
It is an object of the invention to provide a kind of ton load testing machine moving beam lifting system.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of ton load testing machine moving beam is carried
The system of liter, it is flat that the bracket loading test platform includes pedestal, four root posts, back timber, moving beam, moving beam lifting system and loading
Platform；The column is fixedly connected with pedestal respectively, and the back timber is fixed on the top of the column；The weighted platform is fixed on
On the pedestal, the moving beam is located at the top of weighted platform；Moving beam lifting system is used to drive in vertical direction
Moving beam is moved；
Moving beam lifting system includes：Four moving beam lifting hydraulic cylinders and fluid power system；The moving beam is carried
The cylinder barrel for rising hydraulic cylinder is connected by cylinder barrel fixture with back timber, and the lower end of piston rod passes through piston joint element for bar and moving beam
Bottom connection；The cavity for being used for accommodating cylinder barrel is provided with moving beam；Every group of moving beam lifting hydraulic cylinder is mounted on
Displacement transducer and pressure sensor；The fluid power system is used to drive moving beam lifting hydraulic cylinder to run.
Ton load testing machine moving beam lifting system as described above of the invention, further, the cylinder barrel is consolidated
Determining part includes ball ring and anti-pivoted frame, and the cylinder barrel of moving beam lifting hydraulic cylinder is provided with shoulder and gudgeon；In the middle part of the ball ring
For the mounting hole passed through for cylinder barrel, ball ring is connected with back timber, and shoulder is arranged on the top of ball ring；Anti- pivoted frame is fixed with back timber
Connection, the gudgeon is placed in the U-lag of anti-pivoted frame.
Ton load testing machine moving beam lifting system as described above of the invention, further, the piston rod
Connector includes riser, pull bar, thrust articulated bearing, pressing plate, locking nut, stop nut；The middle part of riser is provided with use
In the counterbore for installing piston rod, riser is connected by pull bar with moving beam；Thrust articulated bearing is arranged in the counterbore,
Pressing plate fixing joint bearing outer ring, limits piston rod axial displacement；Locking nut passes through piston rod end external screw thread pretension thrust
Oscillating bearing, stop nut is tightened on the outside of locking nut.
Ton load testing machine moving beam lifting system as described above of the invention, further, the hydraulic pressure drives
Dynamic system includes synchronous hydraulic motor, balanced valve and the first check valve being sequentially communicated by the first petroleum pipeline, by the second petroleum pipeline
The servo valve and the second check valve being sequentially communicated；Two-bit triplet reversal valve and oil inlet pipe, flowline, the oil inlet end of the first petroleum pipeline
Connected with the oil inlet end of the second petroleum pipeline；The oil outlet end of the oil outlet end of first petroleum pipeline and the second petroleum pipeline is lifted with moving beam
Hydraulic cylinder is connected.
Ton load testing machine moving beam lifting system as described above of the invention, further, the hydraulic pressure drives
Dynamic system also includes multiple degrees of freedom coordinated control system, and the multiple degrees of freedom coordinated control system is passed with displacement transducer, pressure
Sensor and the connection of fluid power system signal.
Ton load testing machine moving beam lifting system as described above of the invention, further, the hydraulic pressure drives
Dynamic system also includes overflow valve, and the overflow valve is connected with the overfall of moving beam lifting hydraulic cylinder.
The beneficial effects of the invention are as follows：
The ton load testing machine moving beam lifting system that the present invention is provided, can realize and vertically move in space continuously
It is stepless adjustable.By synchronous four hydraulic cylinders of drive motor, single cylinder design has electrohydraulic servo system to compensate four
The action inconsistency of hydraulic cylinder；Multiple degrees of freedom coordinated control system can coordinate the internal force coupling between lifting hydraulic cylinder, protect
Moving beam is demonstrate,proved steadily, quickly and safely to move in column guide rail.Whole system is simple to operate, and automaticity is high；Hydraulic pressure
Transmission easily realizes overload protection, and Hydraulic Elements energy lubricating by oneself, system service life is long.Because Hydraulic Elements realize series
Change, standardize and generalization, manufacture, operation and maintenance are all more convenient.
Brief description of the drawings
By the detailed description made in conjunction with the following drawings, above-mentioned and/or otherwise advantage of the invention will become
Become apparent from and be easier to understand, these accompanying drawings are schematical, are not intended to limit the present invention, wherein：
Fig. 1 is the ton load testing machine schematic diagram of an embodiment of the present invention；
Fig. 2 is the moving beam lifting hydraulic cylinder schematic diagram of an embodiment of the present invention；
Fig. 3 is the cylinder barrel fixture schematic diagram of an embodiment of the present invention；
Fig. 4 is the piston joint element for bar schematic diagram of an embodiment of the present invention；
Fig. 5 is the high limit position schematic diagram of moving beam lifting system；
Fig. 6 is the lowest limit position view of moving beam lifting system；
Fig. 7 is the fluid power system schematic diagram of an embodiment of the present invention；
Fig. 8 is the multiple degrees of freedom coordinated control system schematic diagram of an embodiment of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows：
1st, pedestal, 2, column, 3, back timber, 4, moving beam, 5, moving beam lifting system, 6, weighted platform, 41, for accommodating
The cavity of cylinder barrel, 51, moving beam lifting hydraulic cylinder, 52, cylinder barrel fixture, 53, fluid power system, 54, piston rod connection
Part, 511, cylinder barrel, 512, piston rod, 521, ball ring, 522, anti-pivoted frame, the 531, first petroleum pipeline, 532, synchronous hydraulic motor,
533rd, balanced valve, the 534, first check valve, the 535, second petroleum pipeline, 536, servo valve, the 537, second check valve, 538, two three
Logical reversal valve, 541, riser, 542, pull bar, 543, thrust articulated bearing, 544, pressing plate, 545, locking nut, 546, locking
Nut.
Embodiment
Hereinafter, the reality of the ton load testing machine moving beam lifting system of the present invention is described with reference to the accompanying drawings
Apply example.
The embodiment recorded herein is the specific embodiment of the present invention, the design for illustrating the present invention,
It is explanatory and exemplary, should not be construed as the limitation to embodiment of the present invention and the scope of the invention.Except what is recorded herein
Implement exception, those skilled in the art can also be based on the application claims and specification disclosure of that using aobvious
The other technical schemes being clear to, these technical schemes include any obvious using making for the embodiment to recording herein
The technical scheme of substitutions and modifications.
The accompanying drawing of this specification is schematic diagram, aids in illustrating the design of the present invention, it is schematically indicated the shape of each several part
And its correlation.It note that between the structure of each part for the ease of clearly showing the embodiment of the present invention, each accompanying drawing
Do not drawn according to identical ratio.Identical reference marker is used to represent identical part.
Fig. 1 shows a kind of ton load testing machine of embodiment, and load testing machine includes pedestal 1, four root posts
2nd, back timber 3, moving beam 4, moving beam lifting system 5 and weighted platform 6；Column 2 is fixedly connected with pedestal 1 respectively, back timber 3
It is fixed on the top of column 2；Weighted platform 6 is fixed on pedestal 1, and moving beam 4 is located at the top of weighted platform 6；It is mobile horizontal
Beam lifting system 5 is used to drive moving beam 4 to move in vertical direction.Pedestal, column, back timber, moving beam and weighted platform
Collectively form the internal force self equilibrium systemses of a set of closing.Test specimen is positioned between weighted platform and moving beam during experiment, mobile
Crossbeam can on a large scale be moved along column guide rail vertical, be suitable for different height of specimen.
As illustrated in figs. 2-7, moving beam lifting system 5 includes：Four moving beam lifting hydraulic cylinders 51 and hydraulic-driven
System 53；The cylinder barrel 511 of moving beam lifting hydraulic cylinder 51 is connected by cylinder barrel fixture 52 with back timber 3, under piston rod 512
End is connected by piston joint element for bar 54 with the bottom of moving beam 4；The cavity for being used for accommodating cylinder barrel is provided with moving beam 4
41；Every group of moving beam lifting hydraulic cylinder 51 is mounted on displacement transducer and pressure sensor；Fluid power system 53 is used for
Driving moving beam lifting hydraulic cylinder 51 is run.
Fig. 5 and Fig. 6 is moving beam lifting system extreme position schematic diagram.Moving beam lowest spatial position is lifting liquid
10 meters of travel positions of cylinder pressure, piston rod all stretches out.Moving beam highest locus is lifting hydraulic cylinder zero stroke position, living
Stopper rod is fully retracted into, and its cylinder barrel head part is located within moving beam connection raised position headspace, thus real
Show the lifting hydraulic cylinder in extra space and disposably just complete lifting process.
In embodiment as shown in Figure 3, cylinder barrel fixture 52 includes ball ring 521 and anti-pivoted frame 522, and moving beam is carried
The cylinder barrel 511 for rising hydraulic cylinder 51 is provided with shoulder and gudgeon；The middle part of ball ring 521 is the mounting hole passed through for cylinder barrel 511, ball ring
521 are connected with back timber 3, and shoulder is arranged on the top of ball ring 521；Anti- pivoted frame 522 is fixedly connected with back timber 3, and gudgeon is placed in anti-
In the U-lag of pivoted frame 522, the circumferential movement of cylinder body is limited.
In embodiment as shown in Figure 4, piston joint element for bar 54 includes riser 541, pull bar 542, thrust joint shaft
Hold 543, pressing plate 544, locking nut 545, stop nut 546；The middle part of riser 541, which is provided with, to be used to install piston rod 512
Counterbore, riser 541 is connected by pull bar 542 with moving beam 4；Thrust articulated bearing 543 is arranged in counterbore, pressing plate 544
Fixing joint bearing outer ring, limits the axial displacement of piston rod 512, and inner ring can be slided globally, it is allowed to the swing of equipment low-angle；
Locking nut 545 is by the end external screw thread pretension thrust articulated bearing 543 of piston rod 512, and stop nut 546 is tightened on locking screw
The outside of mother 545.
Consider the limitation of vertical direction mobile space, moving beam lifting hydraulic cylinder is using single rod unsymmetrical knot configuration
Formula, saves space.Cylinder interior sealing then uses combination sealing form, meets heavy duty requirements.Lifting hydraulic cylinder uses super
Big stroke hydraulic cylinder, the riser of piston rod connection is located at the bottom of moving beam, and moving beam can be achieved from lowest empty meta
The functional requirement that highest locus is moved on a large scale is put, when moving beam position is located at room for promotion top, liquid is lifted
A part for cylinder pressure cylinder barrel is located within moving beam headspace（Being located at is used to accommodate in the cavity 41 of cylinder barrel）, so may be used
To realize in extra space disposable complete lifting process, it is to avoid the secondary trouble for changing raised position, as shown in Figure 5.
Four lifting hydraulic cylinders are equipped with four displacement transducers and four pressure sensors altogether, and position and the pressure of moving beam are provided in real time
Difference, live signal is provided for the motion and dynamic regime of system detectio moving beam.
In embodiment as shown in Figure 7, fluid power system 53 includes the synchronization being sequentially communicated by the first petroleum pipeline 531
Hydraulic motor 532, the check valve 534 of balanced valve 533 and first, the servo valve 536 and second being sequentially communicated by the second petroleum pipeline 535
Check valve 537；Two-bit triplet reversal valve 538 and oil inlet pipe, flowline, the oil inlet end and the second petroleum pipeline of the first petroleum pipeline 531
535 oil inlet end connection；The oil outlet end of the oil outlet end of first petroleum pipeline 531 and the second petroleum pipeline 535 lifts liquid with moving beam
Cylinder pressure 51 is connected.
The fluid power system of above-described embodiment has following annexation and function：1st, when moving beam rises, hydraulic pressure
The synchronized motor of oil distributes to four lifting hydraulic cylinders.Control to distribute to four lift cylinders by the shunting action of syncmotor
Flow it is identical, so that it is guaranteed that lift cylinder lifted speed sync.2nd, the decline of moving beam is realized by the gravity of itself, mobile
When crossbeam declines, balanced valve gives lift cylinder cavity of resorption one upward reaction force, so as to slow down decrease speed.3rd, overflow valve plays peace
Full guard is acted on, and prevents hydraulic system from overloading.4th, when moving beam is moved, by detecting the respective displacement signal of lift cylinder to moving
Dynamic crossbeam position is finely adjusted, and servo valve individually carries out servo closed control to each lifting hydraulic cylinder.5th, no matter syncmotor
Oil circuit, or servo valve control oil circuit are controlled, hydraulic control one-way valve is designed with, the check valve for two control oil circuits except cutting
Change outer, lifting hydraulic cylinder can also be reliably locked at current location.6th, two-bit triplet reversal valve is carried for lifting hydraulic cylinder
Rise and descending motion switching.After moving beam is adjusted, check valve 5 can realize hydraulic locking, it is ensured that moving beam can
That leans on is locked at current location.
In embodiment as shown in Figure 8, fluid power system 53 also includes multiple degrees of freedom coordinated control system, more freely
Degree coordinated control system is connected with displacement transducer, pressure sensor and the signal of fluid power system 53.Further preferred
In embodiment, fluid power system 53 also includes overflow valve, and overflow valve is connected with the overfall of moving beam lifting hydraulic cylinder 51.
The multiple degrees of freedom coordinated control system of above-described embodiment has following connected mode and function：1st, the free degree decomposes square
Battle array is used to two position error signals of moving beam being converted into four lifting hydraulic cylinder pressure controling signals, and driving is corresponding
Lifter motion.2nd, free degree composite matrix is used to turn the feedback signal (position, speed and acceleration) of four lifting hydraulic cylinders
Turn to the feedback signal of two frees degree.3rd, single cylinder velocity composite module is anti-by the differential and acceleration to displacement feedback signal
The integration aggregate velocity signal of feedback signal.4th, the effect of pressure stability controller is by adjusting in the value weakening system of controlled quentity controlled variable
Internal force coupling between each lifting hydraulic cylinder, reduces energy internal friction.Its general principle is to take the pressure difference of each lifting hydraulic cylinder to be feedback
Amount, calculates the internal force coupling value of each hydraulic cylinder, then is added to each hydraulic cylinder according to a certain percentage after this value is negated and controls back
The inner ring on road.Translational motion of the final strict control moving beam along Z-direction, it is ensured that do not occur movement interference with column guide rail.
Each technical characteristic of above-mentioned disclosure is not limited to disclosed and further feature combination, and those skilled in the art are also
Other combinations between each technical characteristic can be carried out according to the purpose of invention, are defined by the purpose for realizing the present invention.
Claims (7)
1. a kind of ton load testing machine moving beam lifting system, it is characterised in that the ton load test dress
Put including pedestal, four root posts, back timber, moving beam, moving beam lifting system and weighted platform；The column respectively with base
Seat is fixedly connected, and the back timber is fixed on the top of the column；The weighted platform is fixed on the pedestal, the movement
Crossbeam is located at the top of weighted platform；Moving beam lifting system is used to drive moving beam movement in vertical direction；It is mobile horizontal
Beam lifting system includes：Four moving beam lifting hydraulic cylinders and fluid power system；The moving beam lifting hydraulic cylinder
Cylinder barrel is connected by cylinder barrel fixture with back timber, and the lower end of piston rod is connected by the bottom of piston joint element for bar and moving beam
Connect；The cavity for being used for accommodating cylinder barrel is provided with moving beam；Every group of moving beam lifting hydraulic cylinder is mounted on displacement sensing
Device and pressure sensor；The fluid power system is used to drive moving beam lifting hydraulic cylinder to run.
2. ton load testing machine moving beam lifting system according to claim 1, it is characterised in that the cylinder
Cylinder fixture includes ball ring and anti-pivoted frame, and the cylinder barrel of moving beam lifting hydraulic cylinder is provided with shoulder and gudgeon；The ball ring
Middle part is the mounting hole passed through for cylinder barrel, and ball ring is connected with back timber, and shoulder is arranged on the top of ball ring；Anti- pivoted frame and back timber
It is fixedly connected, the gudgeon is placed in the U-lag of anti-pivoted frame.
3. ton load testing machine moving beam lifting system according to claim 2, it is characterised in that the work
Stopper rod connector includes riser, pull bar, thrust articulated bearing, pressing plate, locking nut, stop nut；Set in the middle part of riser
There is the counterbore for installing piston rod, riser is connected by pull bar with moving beam；Thrust articulated bearing is arranged on described heavy
In hole, pressing plate fixing joint bearing outer ring limits piston rod axial displacement；Locking nut passes through piston rod end external screw thread pretension
Thrust articulated bearing, stop nut is tightened on the outside of locking nut.
4. the ton load testing machine moving beam lifting system according to claim any one of 1-3, its feature exists
In, the fluid power system includes synchronous hydraulic motor, balanced valve and the first check valve being sequentially communicated by the first petroleum pipeline,
The servo valve and the second check valve being sequentially communicated by the second petroleum pipeline；It is two-bit triplet reversal valve and oil inlet pipe, flowline, first defeated
The oil inlet end connection of the oil inlet end of oil pipe and the second petroleum pipeline；The oil outlet end of the oil outlet end of first petroleum pipeline and the second petroleum pipeline with
Moving beam lifting hydraulic cylinder is connected.
5. ton load testing machine moving beam lifting system according to claim 4, it is characterised in that the liquid
Drive system is pressed also to include multiple degrees of freedom coordinated control system, the multiple degrees of freedom coordinated control system and displacement transducer, pressure
Force snesor and the connection of fluid power system signal.
6. ton load testing machine moving beam lifting system according to claim 4, it is characterised in that the liquid
Drive system is pressed also to include overflow valve, the overflow valve is connected with the overfall of moving beam lifting hydraulic cylinder.
7. ton load testing machine moving beam lifting system according to claim 6, it is characterised in that the liquid
Drive system is pressed also to include multiple degrees of freedom coordinated control system, the multiple degrees of freedom coordinated control system and displacement transducer, pressure
Force snesor and the connection of fluid power system signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710312310.0A CN107271288B (en) | 2017-05-05 | 2017-05-05 | 10,000 tons load testing machine moving beam lifting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710312310.0A CN107271288B (en) | 2017-05-05 | 2017-05-05 | 10,000 tons load testing machine moving beam lifting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107271288A true CN107271288A (en) | 2017-10-20 |
| CN107271288B CN107271288B (en) | 2019-08-23 |
Family
ID=60073720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710312310.0A Active CN107271288B (en) | 2017-05-05 | 2017-05-05 | 10,000 tons load testing machine moving beam lifting system |
Country Status (1)
| Country | Link |
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| CN (1) | CN107271288B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284911A (en) * | 2020-10-14 | 2021-01-29 | 中国建筑股份有限公司 | Ten-thousand-ton-level multifunctional test system |
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|---|---|---|---|---|
| CN103216485A (en) * | 2013-04-09 | 2013-07-24 | 西安交通大学 | Piston cylinder for driving movable transverse beam to ascend and descend and supplying oil to hydraulic cylinder in transverse beam |
| CN105257614A (en) * | 2015-11-25 | 2016-01-20 | 上海电气液压气动有限公司 | Hydraulic oil cylinder high-precision synchronous control complete device of ultralarge heavy equipment |
| CN105424483A (en) * | 2015-11-05 | 2016-03-23 | 中国建筑股份有限公司 | Buckling-restrained brace self-balancing vertical loading test system and method thereof |
| CN205170290U (en) * | 2015-12-02 | 2016-04-20 | 招商局重工(深圳)有限公司 | Hoisting device |
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2017
- 2017-05-05 CN CN201710312310.0A patent/CN107271288B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103216485A (en) * | 2013-04-09 | 2013-07-24 | 西安交通大学 | Piston cylinder for driving movable transverse beam to ascend and descend and supplying oil to hydraulic cylinder in transverse beam |
| CN105424483A (en) * | 2015-11-05 | 2016-03-23 | 中国建筑股份有限公司 | Buckling-restrained brace self-balancing vertical loading test system and method thereof |
| CN105257614A (en) * | 2015-11-25 | 2016-01-20 | 上海电气液压气动有限公司 | Hydraulic oil cylinder high-precision synchronous control complete device of ultralarge heavy equipment |
| CN205170290U (en) * | 2015-12-02 | 2016-04-20 | 招商局重工(深圳)有限公司 | Hoisting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284911A (en) * | 2020-10-14 | 2021-01-29 | 中国建筑股份有限公司 | Ten-thousand-ton-level multifunctional test system |
| CN112284911B (en) * | 2020-10-14 | 2023-10-10 | 中建工程试验检测(北京)有限公司 | Multi-functional test system of ten thousand tons level |
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| Publication number | Publication date |
|---|---|
| CN107271288B (en) | 2019-08-23 |
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