CN105675397B - A kind of big travel displacement high precision measuring device based on dynamic balancing operation principle - Google Patents
A kind of big travel displacement high precision measuring device based on dynamic balancing operation principle Download PDFInfo
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- CN105675397B CN105675397B CN201610006049.7A CN201610006049A CN105675397B CN 105675397 B CN105675397 B CN 105675397B CN 201610006049 A CN201610006049 A CN 201610006049A CN 105675397 B CN105675397 B CN 105675397B
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- plunger
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- cylinders
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Classifications
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
Abstract
The invention belongs to mechanical engineering testing field, there is provided a kind of big travel displacement high precision measuring device based on dynamic balancing operation principle.It is measured envisaged underneath A, B, C hydraulic cylinder subsystem of shifting axle, A subsystems and B subsystems are plunger-type cylinder, diameter ratio 1：3, incompressible hydraulic oil is as transmission medium, the displacement of B system sensor detection realizes 9 times of amplification, and high-precision servo motor can accurately control guide screw movement, so as to keep B system high accuracy displacement sensor output signal all the time in the constant state of a dynamic stability.The apparatus structure is dexterous, rationally distributed, strong adaptability, long lifespan, measurement accuracy are high, solves the problems, such as the high-precision bidirectional measurement in wide range gamut, has good economy and promotional value.
Description
Technical field
The invention belongs to mechanical engineering testing field, is related to soil mechanics triaxial test, especially a kind of to be directed to big stroke
The High-accuracy displacement detection device of force transmission shaft.
Background technology
Measure the intensity of soil and deform and often use triaxial tester, the instrument application is extensive, a variety of available for measuring
Parameter, including shear strength characteristics, consolidate feature and soil permeability.The change of sample axial displacement under wherein certain stress
Change is a very important measurement parameter, and the height of axial displacement measurement accuracy determines the success or failure of triaxial test.For medium and small
Type triaxial tester, sample axial displacement constant interval are typically smaller than 150mm, and current existing Linear displacement transducer is such as：Electricity
Sense formula, resistance-type, magnet ring type displacement transducer etc. can meet to require substantially.Sample axial displacement constant interval is smaller, selection
The range of displacement transducer is smaller, and the measurement accuracy in whole section is higher, and vice versa.However, for the large-scale, axle of ultra-large type three
Test instrument, sample axial deformation section is directed to diameter 1.0mm up to 500mm during triaxial test, high 2.5 cylinder sample,
Cylinder sample height change in experiment<20%, the displacement transducer if selected range is 500mm can cause the precision of local measurement
It is very low.Therefore, in large-scale, ultra-large type triaxial test, the high-acruracy survey of sample axial displacement is extremely difficult.
At present, both at home and abroad also without for the large range high precision measurement apparatus large-scale, ultra-large type triaxial tester is special.
Wide range grating scale can ensure the measurement accuracy in whole section, due to large-scale, ultra-large type triaxial tester generally use hydraulic pressure
Servo-drive system, stronger high dither interference can be produced under conditions of heavy duty by applying, can be which results in wide range grating scale
Accumulated error is produced under big noise background, causes the reduction of measurement accuracy.It can not confirm current location after other grating scale power-off,
Back to zero position is needed to be remeasured after resetting.Therefore, because the accumulated error under big noise background can not be eliminated, it is high-precision a large amount of
Journey grating scale is not appropriate for applying in large-scale, ultra-large type triaxial tester.
The content of the invention
The purpose of the present invention is：Solve triaxial tester axial displacement and accurately measure problem, the measurement apparatus of invention is realized
The sample axial direction large deformation section 1000mm continuous measurement of high accuracy.Present apparatus feature is simple in construction, measures displacement equations 9
Times, measurement accuracy is high, and stable movement ensure that in detection process and be disturbed without additional vibratory.
The technical solution adopted by the present invention is：A kind of big travel displacement high-acruracy survey dress based on dynamic balancing operation principle
Put, including A hydraulic cylinders subsystem, B hydraulic cylinders subsystem and C hydraulic cylinder subsystems, A hydraulic cylinders subsystem include measurement baffle plate 3,
A plunger-type cylinders output shaft 4, A plunger-type cylinders 5, A plunger hydraulics chucking cylinder 6, the and of A plunger-type cylinders fixed plate 1
The upper connection flexible pipes 7 of A, B hydraulic cylinders subsystem include high accuracy displacement sensor 12, fixing rack for sensor 13, B plunger-type cylinders
Output shaft 1, B plunger-type cylinders 15, B plunger hydraulics chucking cylinder 16, B plunger-type cylinders fixed plate 11, the upper connection flexible pipes of B
17 and back-moving spring 28, C hydraulic cylinders subsystem, which includes servomotor 26, servomotor leading screw conversion equipment 25, servomotor, leads
Rail 24, piston-type hydraulic cylinder 22, C firm bankings 27 and C connection flexible pipes 21；
Plunger-type cylinder A fixed plates 1 in A hydraulic cylinder subsystems are fixed on vertical wall, A plunger-type cylinders 5
It is secured by bolts in plunger-type cylinder A fixed plates 1, oil cylinder/cylinder output shaft 2, measurement baffle plate 3, A plunger-type cylinders
Output shaft 4 and A plunger-type cylinders 5 are sequentially connected；A plunger-type cylinders 5 are connected by A plunger hydraulics chucking cylinder 6 with A
Flexible pipe 7 be connected, the upper connection flexible pipes 7 of A by connection flexible pipe A9 under crossover sub A8 connections A, and with B hydraulic cylinders subsystem, C hydraulic pressure
Mug system is connected；Crossover sub is fixed in crossover sub fixed plate；Under A under connection flexible pipe 9, B under connection flexible pipe 19 and C
Connection flexible pipe 21 is connected by T-shaped three-way connection 10；
Plunger-type cylinder fixed plate 11 in B hydraulic cylinder subsystems is fixed on wall, and plunger-type cylinder 15 passes through
Bolt is fixed thereon face, and back-moving spring 28 is connected with the inner output shaft of B plunger-type cylinders 15；High accuracy displacement sensor 12
It is fixed in plunger-type cylinder fixed plate 11 by fixing rack for sensor 13, and is connected with B plunger-type cylinders output shaft 14；
B plunger-type cylinders output shaft (14) is connected with B plunger-type cylinders (15), and B plunger-type cylinders (15) pass through B plunger type liquid
Cylinder pressure fixture (16) is connected with connection flexible pipe on B (17)；
C firm bankings 27 are fixed on ground in C hydraulic cylinder subsystems, piston-type hydraulic cylinder 22 and servomotor guide rail 24
It is fixed on C firm bankings 27, servomotor leading screw conversion equipment 25 is installed on servomotor guide rail 24, for connecting ball
Leading screw 23 and servomotor 26, realize the conversion of motion.
The situation of movement of axial traverse measurement baffle plate 3 is identical with measured axis 1 in triaxial tester loading procedure.
Before measurement starts, first measurement baffle plate 3 is contacted with the piston rod 4 of left side hydraulic cylinder, adjustment servomotor 26 drives
Lower hydraulic cylinder piston rod moves to left, and ensures system contact gapless, now sensor and servomotor are demarcated, when displacement passes
When the output signal of sensor 12 is equal with setting value median, servomotor stop motion, system is in state to be detected.
When starting measurement, A subsystems are changed first, and measurement baffle plate promotes A plunger rods 4 to move, so as to promote liquid
Force feed flows in systems, and electric cylinder is initially motionless, and hydraulic oil can only promote the plunger rod 14 of B system to move, A, B system plunger
Shank diameter is than 1：3, when A system displacements are delivered to B system, actual displacement is equivalent to being exaggerated 9 times, the high accuracy of B subsystems
After displacement transducer 12 detects displacement signal, controller is transmitted a signal to, the purpose of controller seeks to ensure that position is high-precision
It is invariable to spend displacement transducer output signal, now controls the movement of the driving electric cylinder output shaft of servomotor 26, makes C subsystems
The piston rod of hydraulic cylinder moves to right, and hydraulic oil enters C system hydraulic cylinder via connection flexible pipe, and B subsystem piston rods are in back-moving spring
In the presence of 28, recover initial position, until sensor output value is equal with setting value, servomotor 26 shuts down.Due to
Servomotor uses high-precision encoder, reads the pulse data of encoder in servomotor operation process, is counted accordingly
Calculate, it is possible to obtain the accurate displacement of triaxial tester force transmission shaft.
The effect and benefit of the present invention：It is measured the envisaged underneath of shifting axle A, B, C hydraulic cylinder subsystem, A subsystems
It is plunger-type cylinder with B subsystems, diameter ratio 1：3, incompressible hydraulic oil senses as medium, B system is transmitted
The displacement of device detection realizes 9 times of amplification, and high-precision servo motor can accurately control guide screw movement, so as to keep
B system high accuracy displacement sensor output signal is in the constant state of a dynamic stability all the time.Servomotor is using peace
River AC servomotors 26, the servomotor carry 24 photoelectric encoders, and motor, which rotates a circle, can produce 16777216 physics
Pulse has high Angular Displacement Detecting precision.Using C7 levels ball-screw 23, trueness error is less than 50um/300mm.Servo electricity
Machine program control pulse be arranged to 20000 pulses/turn.High accuracy displacement sensor range 20mm (- 10mm -10mm), measurement accuracy
<0.1%, 0-10V of gamut output voltage signal.
The device ensure that measurement and positioning precision from high-precision minute displacement sensor and servomotor.Passed using hydrostatic
Flowing mode, stable movement ensure that in detection process and disturbed without additional vibratory.The apparatus structure is dexterous, rationally distributed, adaptability
By force, long lifespan, measurement accuracy are high, solve the problems, such as the high-precision bidirectional measurement in wide range gamut, have good economy
Property and promotional value.
Brief description of the drawings
Fig. 1 is the front view of big travel displacement high precision measuring device.
Fig. 2 is the top view of the equipments overall structure.
Fig. 3 is the left view of the equipments overall structure.
Fig. 4 is the equipments overall structure normal axomometric drawing.
Fig. 5 is that the device removes general structure front view after plunger hydraulic cylinder body.
In figure：1 plunger-type cylinder A fixed plates；2 oil cylinders/cylinder output shaft；3 measurement baffle plates；4A plunger-type cylinders are defeated
Shaft；5A plunger-type cylinders；6A plunger hydraulic chucking cylinders；The upper connection flexible pipes of 7A；8 crossover sub A；Connection flexible pipe under 9A；
10T type three-way connections；11B plunger-type cylinder fixed plates；12 high accuracy displacement sensors；13 fixing rack for sensor；14B plungers
Formula hydraulic cylinder output shaft；15B plunger-type cylinders；16B plunger hydraulic chucking cylinders；The upper connection flexible pipes of 17B；18 crossover sub B；
Connection flexible pipe under 19B；20 crossover sub fixed plates；Connection flexible pipe under 21C；22 piston-type hydraulic cylinders；23 ball-screws；24 servos
Motor slide rails；25 servomotor leading screw conversion equipments；26 servomotors；27C firm bankings；28 back-moving springs.
Embodiment
Describe the embodiment of the present invention in detail below in conjunction with technical scheme and accompanying drawing.
As Figure 1-5, part is cleaned with kerosene during assembling, dries rear matching surface oiling, each part not finished surface
It should clean up, remove burr, applying preventive by dipping paint, multilayer unsintered tape, strict guarantee hydraulic cylinder and liquid are wound in seal
Cylinder pressure and the sealing of flexible pipe junction；Tri- sets of hydraulic cylinder subsystems of A, B, C are can be clearly seen that in Fig. 1, A subsystems include
Plunger-type cylinder A fixed plates, oil cylinder/cylinder output shaft, axial movement measurement baffle plate, plunger-type cylinder A output shafts, post
Plunger type hydraulic cylinder A, plunger-type cylinder A stationary fixtures, connected under connection flexible pipe, PG6-4 crossover sub A, A systems in A systems
Flexible pipe, T-shaped three-way connection.B subsystems include plunger-type cylinder B fixed plates, displacement transducer, sensor stationary fixture, post
Plunger type hydraulic cylinder B output shafts, plunger-type cylinder B, plunger-type cylinder B stationary fixtures, connection flexible pipe, PG6-4 turn on B system
Connection flexible pipe under changing-over head B, B system.C system, which includes C connection flexible pipes, piston-type hydraulic cylinder, ball-screw, servomotor, leads
Rail, servomotor and leading screw conversion equipment, servomotor, C system firm banking.
The fixed plate 1 that can be seen that according to Fig. 1 and Fig. 2 in A subsystems is fixed on vertical wall, plunger-type cylinder
It is secured by bolts in above it, is connected by connection flexible pipe on A 7 with B, C subsystem；B subsystem plunger-type cylinders are consolidated
Fixed board is fixed on wall, and plunger-type cylinder is secured by bolts in above it, and back-moving spring 28 is added in plunger-type cylinder
On inner output shaft, high accuracy displacement sensor 12 is fixed to B plunger-type cylinders fixed plate 11 by fixing rack for sensor 13
On, it is connected by connection flexible pipe on B 17 with A, C subsystem.Axial displacement axle 1 in triaxial tester loading procedure is to moving down
Dynamic, moving axially the elastic deformation of measurement baffle plate 3 can ignore, and therefore, the situation of movement of axial movement measurement baffle plate 3 is with being tested
Axle 1 is identical.
Before measurement starts, the hydraulic oil in system keeps sealing, first connects plunger-type cylinder A output shafts and measurement baffle plate
Touch, other systems are kept immobilizing, and now controller is accurately controlled servomotor by high-precision encoder, first band
Dynamic leading screw is moved to the left, and promotes hydraulic oil to enter A, B system, because plunger-type cylinder A output shafts contact with measurement baffle plate, institute
Seldom with the hydraulic oil entered in A systems, simply plunger-type cylinder A output shafts contact even closer with measurement baffle plate, and
Plunger-type cylinder B output shafts can promote sensor motion because of the hydraulic oil that B system enters, and servomotor is compiled with 24 photoelectricity
Code device, precision is very high, and when displacement transducer signal is measured as 5V middle positions, servomotor stops, and system initialization is completed, and enters
Band measure state.
After A subsystems detect displacement downward input signal, plunger-type cylinder output shaft 4 moves down, and promotes post
Hydraulic oil movement in plunger type hydraulic cylinder, is discharged, because C subsystem piston-type hydraulic cylinders are just initially located in inactive state,
The hydraulic oil of discharge is transported to B subsystems via connection flexible pipe, promotes the plunger-type cylinder output shaft 14 of B system to move up, high
Accuracy Displacement sensor 12 measures displacement signal, and the displacement signal measured is input to controller, controller control servomotor 26
Running at high precision, high-precision electric cylinder servomotor, feed screw nut assemblage zone piston accurately suck hydraulic oil, when hydraulic oil is arranged
When going out plunger-type cylinder B15 cylinder bodies, the high resiliency spring 28 in compressive state resets, and B subsystem plunger-type cylinders are defeated
Shaft reseting movement in the presence of back-moving spring, B system high accuracy displacement sensor 12 detects displacement, so in A subsystems
In the case that displacement is constantly moved down/moved up, B subsystem high accuracy displacement sensor output signal 5V dynamic stabilities are kept, finally
By encoder for servo motor service data, the displacement of output shaft can be accurately obtained by calculating.
In addition, selection high-quality petroleum base hydraulic oil as driving medium, ensure that the stationarity of transmission, response it is quick
And accuracy, improve control accuracy.The apparatus structure is dexterous, rationally distributed, strong adaptability, long lifespan, measurement accuracy are high, solution
The high-precision bidirectional measurement problem determined in wide range gamut, there is good economy and promotional value.
Claims (2)
1. a kind of big travel displacement high precision measuring device based on dynamic balancing operation principle, including A hydraulic cylinders subsystem, B liquid
Cylinder pressure subsystem and C hydraulic cylinder subsystems, A hydraulic cylinders subsystem include measurement baffle plate (3), A plunger-type cylinder output shafts
(4), connection flexible pipe on A plunger-type cylinders (5), A plunger hydraulics chucking cylinder (6), A plunger-type cylinders fixed plate (1) and A
(7), B hydraulic cylinders subsystem includes high accuracy displacement sensor (12), fixing rack for sensor (13), the output of B plunger-type cylinders
Axle (14), B plunger-type cylinders (15), B plunger hydraulics chucking cylinder (16), B plunger-type cylinders fixed plate (11), connect on B
Flexible pipe (17) and back-moving spring (28) are connect, C hydraulic cylinders subsystem includes servomotor (26), servomotor leading screw conversion equipment
(25), servomotor guide rail (24), piston-type hydraulic cylinder (22), C firm bankings (27) and C connection flexible pipes (21)；
It is characterized in that：Plunger-type cylinder A fixed plates (1) in A hydraulic cylinder subsystems are fixed on vertical wall, A plungers
Formula hydraulic cylinder (5) is secured by bolts in plunger-type cylinder A fixed plates (1), oil cylinder/cylinder output shaft (2), measurement baffle plate
(3), A plunger-type cylinders output shaft (4) and A plunger-type cylinders (5) are sequentially connected；A plunger-type cylinders (5) pass through A posts
Plunger type hydraulic chucking cylinder (6) is connected with connection flexible pipe on A (7), and the upper connection flexible pipes of A (7) under crossover sub A (8) connections A by connecting
Flexible pipe A (9) is met, and is connected with B hydraulic cylinders subsystem, C hydraulic cylinder subsystems；Crossover sub is fixed on crossover sub fixed plate
On；Connection flexible pipe (19) is connected with connection flexible pipe under C (21) by T-shaped three-way connection (10) under connection flexible pipe (9), B under A；B liquid
Plunger-type cylinder fixed plate (11) in cylinder pressure subsystem is fixed on wall, and plunger-type cylinder (15) is bolted
Face thereon, back-moving spring (28) are connected with B plunger-type cylinders (15) inner output shaft；High accuracy displacement sensor (12) is logical
Fixing rack for sensor (13) is crossed fixed in plunger-type cylinder fixed plate (11), and with B plunger-type cylinders output shaft (14)
Connection；B plunger-type cylinders output shaft (14) is connected with B plunger-type cylinders (15), and B plunger-type cylinders (15) pass through B posts
Plunger type hydraulic chucking cylinder (16) is connected with connection flexible pipe on B (17)；C firm bankings (27) are fixed on ground in C hydraulic cylinder subsystems
On face, piston-type hydraulic cylinder (22) and servomotor guide rail (24) are fixed on C firm bankings (27), the conversion of servomotor leading screw
Device (25) is installed on servomotor guide rail (24), for connecting ball-screw (23) and servomotor (26), realizes fortune
Dynamic conversion, piston-type hydraulic cylinder (22) are connected with connection flexible pipe under C (21), and the piston rod of C subsystem hydraulic cylinders is with being connected rolling
Ballscrew (23) is connected；
The situation of movement of axial traverse measurement baffle plate (3) is identical with measured axis in triaxial tester loading procedure.
2. a kind of high accuracy survey of big travel displacement based on dynamic balancing operation principle is carried out using the device described in claim 1
Amount method, it is characterised in that：Before measurement starts, the hydraulic oil in big travel displacement high precision measuring device keeps sealing, by A posts
Plunger type hydraulic cylinder output shaft (4) is contacted with measurement baffle plate (3), and controller is carried out by high-precision encoder to servomotor (26)
Control, first drive leading screw to be moved to the left, promote hydraulic oil to enter A hydraulic cylinders subsystem and B hydraulic cylinder subsystems, due to A plungers
Formula hydraulic cylinder output shaft (4) contacts with measurement baffle plate (3), and a small amount of hydraulic oil enters A hydraulic cylinder subsystems, A plunger-type cylinders
Output shaft (4) is in close contact with measurement baffle plate (3), and most hydraulic oil then enter B hydraulic cylinder subsystems, and B plunger-type cylinders are defeated
Shaft (14) promotes the measurement head motion of high accuracy displacement sensor (12), and servomotor (26) carries 24 photoelectric encoders,
When high accuracy displacement sensor (12) output signal is measured as 5V, servomotor (26) stops, and system initialization is completed, and enters
Measuring state；After A hydraulic cylinder subsystems detect displacement input, A plunger-type cylinders output shaft (4) moves down,
The hydraulic oil movement in A plunger-type cylinders (5) is promoted, is discharged, due to C hydraulic cylinder subsystem piston-type hydraulic cylinders (22)
Inactive state is initially in, the hydraulic oil of discharge is transported to B hydraulic cylinder subsystems via connection flexible pipe, promotes B hydraulic cylinder subsystems
The B plunger-type cylinders output shaft (14) of system moves up, and obtains displacement signal using high accuracy displacement sensor (12), the position measured
Shifting signal is input to controller, controller control servomotor (26) running at high precision, servomotor leading screw conversion equipment (25)
Band piston is accurately discharged into hydraulic oil, when hydraulic oil discharges plunger-type cylinder B (15) cylinder body, in the high-elastic of compressive state
Property spring (28) reset, B hydraulic cylinder subsystem plunger-type cylinder output shafts (15) reset in the presence of back-moving spring (28)
Motion, B hydraulic cylinder subsystem high accuracy displacement sensor (12) high precision test are so continuous in A hydraulic cylinder subsystem displacements
In the case of input, B hydraulic cylinder subsystem high accuracy displacement sensor (12) output signal 5V dynamic stabilities are kept, finally by
Encoder for servo motor service data, the size of A hydraulic cylinder subsystem displacements is accurately obtained by calculating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610006049.7A CN105675397B (en) | 2016-01-06 | 2016-01-06 | A kind of big travel displacement high precision measuring device based on dynamic balancing operation principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610006049.7A CN105675397B (en) | 2016-01-06 | 2016-01-06 | A kind of big travel displacement high precision measuring device based on dynamic balancing operation principle |
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| Publication Number | Publication Date |
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| CN105675397A CN105675397A (en) | 2016-06-15 |
| CN105675397B true CN105675397B (en) | 2018-04-10 |
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| CN201610006049.7A Expired - Fee Related CN105675397B (en) | 2016-01-06 | 2016-01-06 | A kind of big travel displacement high precision measuring device based on dynamic balancing operation principle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2244940C1 (en) * | 2003-09-11 | 2005-01-20 | Ковалев Сергей Владимирович | Device for changing area of reflecting surface |
| CN104406839B (en) * | 2014-10-28 | 2017-01-18 | 大连理工大学 | Walking type high-precision and wide-range displacement detection apparatus |
| CN204389102U (en) * | 2014-12-10 | 2015-06-10 | 上海精密计量测试研究所 | Dual force source superposing type multi-dimension force sensor calibrating installation |
| CN104674784B (en) * | 2015-01-09 | 2016-06-15 | 浙江大学 | Side slope tidal level regulation device when hypergravity |
| CN104749035B (en) * | 2015-03-18 | 2017-03-29 | 西北大学 | A kind of earthwork triaxial apparatus charger and loading method |
| CN105180870B (en) * | 2015-09-08 | 2017-11-10 | 大连理工大学 | Hydrostatic drive formula great-scale displacement Bidirectional detecting device |
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Granted publication date: 20180410 Termination date: 20210106 |