CN104458424A - Real-time precision measurement device of test sample volume change in ultralarge triaxial test - Google Patents

Real-time precision measurement device of test sample volume change in ultralarge triaxial test Download PDF

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Publication number
CN104458424A
CN104458424A CN201410578651.9A CN201410578651A CN104458424A CN 104458424 A CN104458424 A CN 104458424A CN 201410578651 A CN201410578651 A CN 201410578651A CN 104458424 A CN104458424 A CN 104458424A
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China
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slender glass
draining
solenoid valve
buret
glass buret
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CN201410578651.9A
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CN104458424B (en
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孔宪京
邹德高
桑勇
周晨光
刘京茂
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Dalian University of Technology
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Dalian University of Technology
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Abstract

The invention relates to a real-time precision measurement device of the volume change of a test sample in an ultralarge triaxial test, and belongs to the technical field of the test of the mechanical engineering. The real-time precision measurement device is characterized by comprising a servo motor, an electric cylinder, a water guide trough, a water discharging barrel, a slender glass measuring pipe B, a right pressure difference sensor, a slender glass measurement pipe A, a left pressure difference sensor, a counterweight plate and the like. The height of the water guide trough on the water discharging barrel is precisely controlled by the servo motor according to the real-time height of the test sample, and the height of a water discharging opening is ensured to be equal to the height of the middle part of the test sample. The counterweight plate plays a role in balancing the weight of a glass pipe supporting plate, the slender glass measurement pipe B and the slender glass measurement pipe A, and the water discharging barrel is ensured not to incline. The slender glass measurement pipe A and the slender glass measurement pipe B are controlled by an electromagnetic valve to alternately charge water/discharge water, so that the continuous high-precision measurement on the ultralarge water displacement of the test sample can be realized. The real-time precision measurement device has beneficial effects that the structure is ingenious, the layout is reasonable, the measurement precision is high, the problem of the continuous high-precision measurement on the water displacement can be solved, and the popularization value is good.

Description

The real―time precision measurment device that in super large triaxial test, a kind of sample body becomes
Technical field
The invention belongs to Measurement Techniques of Mechanic Engineering field, relate to soil mechanics triaxial test, especially a kind of device detecting sample body change (water discharge) in super large triaxial test process.
Background technology
Measure the Strength and Dformation of soil and often use triaxial tester, this instrument application is extensive, can be used for measuring many kinds of parameters, comprises shear resistance and deformation characteristic, consolidation feature and soil permeability.Its major function equipment comprises the control of principle stress size, and body becomes the measurement of (water discharge) and pore pressure.Super large triaxial tester is mainly for super large sample (diameter 1.0 meters, the cylinder sample of high 2.0 meters) complete large confined pressure, heavy load test, the Strength and Dformation feature of test super large sample, can complete the experiment work of large hydropower station earth and rockfill dam material behavior.In process of the test, the acquisition of measurement water discharge is crossed in sample body accommodation.Water discharge is as estimated according to 10% of volume of sample, and diameter 1.0 meters, the super large sample water discharge of high 2.0 meters will reach 160L.Wanting to realize real-time continuous, accurately to measure so large water discharge be very difficult.
At present, the domestic real-time continuous device for accurately measuring not becoming (water discharge) for super large sample body.GDS company of famous foreign ground device fabrication producer accesses custom-designed flow sensor to realize the detection that sample body becomes (water discharge) in discharge pipe line.This flow sensor is the patent that GDS company has, and measuring accuracy is not too high, expensive and externally do not sell, and is commercially difficult to buy.In addition, for super large sample, for ensureing the accuracy of water discharge, need to ensure that the pressure in the middle part of sample remains equal with atmospheric pressure.Due to the general very Gao Keda 2.0-2.5 meters of specimen height, specimen height distortion can reach 400-500mm.Therefore, need the height of dynamic adjustments freeing port according to the dynamic deformation of sample, ensure that the height of freeing port is equal with the medium position of sample all the time.The height of dynamic adjustments freeing port is also large-scale, ultra-large type triaxial tester needs consideration when measuring sample body change according to water discharge problem.
Summary of the invention
The object of the invention is: the device providing a kind of large water discharge continuous precise to measure, solves the problem accurately measuring sample body change in ultra-large type triaxial test according to water discharge.
The technical solution used in the present invention is: this device is made up of two subsystems: freeing port height dynamic conditioning subsystem and water discharge Automatic continuous detection subsystem.Freeing port height dynamic conditioning subsystem is primarily of the composition such as electric cylinder (servomotor, feed screw nut combine), fixture, draining bucket, gutter, pipeline.The output shaft of electric cylinder drives draining bucket to move up and down, and ensures that the freeing port of gutter is contour with the middle part of sample all the time.In process of the test, the height change of sample needs accurately to measure, and accurately can control the moving displacement of draining bucket according to the change of this specimen height.Water discharge Automatic continuous detection subsystem, for detecting the water yield of discharging from draining bucket, realizes the accurate detection of water discharge by two slender glass burets.Buret is thinner, and cross-sectional area is less, and the precision of the water discharge recorded like this is higher.Slender glass buret is equipped with high precision differential pressure pickup, can the size of water discharge in accurate Calculation slender glass buret according to the output voltage values of differential pressure pickup after static demarcating.
Freeing port height dynamic conditioning subsystem by servomotor 1, electric cylinder cylinder body 2, gutter 3, two pass joints 4, draining bucket 5, right slide block 7, right guide rail 8, right rail support plate 10, guide supporting rod 11, system support post A12, ring flange 18, Bucket Cover 19, electric cylinder back up pad 20, left rail back up pad 21, left slider 22, left rail 25, system support post B26, system support post C32, the compositions such as system support post D33.Water discharge Automatic continuous detection subsystem by top hose 6, right flexible pipe 9, slender glass buret B13, glass tube back up pad 14, right differential pressure pickup 15, bottom right flexible pipe 16, with the three-way connection B17 of solenoid valve, with the three-way connection A23 of solenoid valve, left flexible pipe 24, slender glass buret A27, left differential pressure pickup 28, lower-left flexible pipe 29, with the three-way connection C30 of solenoid valve, composition such as Weight plate 31 grade.
Wherein: system support post A12, system support post B26, system support post C32, system support post D33 are fixed on ground, and support fixing freeing port height dynamic conditioning subsystem.Draining bucket 5 is connected with the output shaft of electric cylinder cylinder body 2, and servomotor 1, according to the height highly accurately controlling gutter 3 on draining bucket 5 in real time of sample, ensure that freeing port height is equal with sample middle height.Right rail support plate 10 is for fixing right guide rail 8, and left rail back up pad 21 is for fixing left rail 25.Right slide block 7 and left slider 22 are fixed on draining bucket 5.Guide supporting rod 11 is used for fixing right rail support plate 10 and left rail back up pad 21.Such draining bucket 5 can be fixed between right guide rail 8 and left rail 25, and can freely up and down slide.Slender glass buret B13 and slender glass buret A27 is fixed on glass tube back up pad 14, and Weight plate 31 plays the effect of the weight such as balance glass tube back up pad 14, slender glass buret B13 and slender glass buret A27, ensure that draining bucket 5 not run-off the straight.Be the three-way connection A23 with solenoid valve between top hose 6 and the left flexible pipe 24 of right flexible pipe 9/, right flexible pipe 9 is connected with slender glass buret B13, left flexible pipe 24 is connected with slender glass buret A27, and the three-way connection A23 with solenoid valve realizes and slender glass buret B13, slender glass buret A27 conducting switch operating.Right differential pressure pickup 15 is arranged on the below of slender glass buret B13, and left differential pressure pickup 28 is arranged on the below of slender glass buret A27.Right differential pressure pickup 15 and left differential pressure pickup 28 are used for measuring the size of water discharge in slender glass buret B13 and slender glass buret A27.Three-way connection B17 with solenoid valve is connected with slender glass buret A27 with slender glass buret B13 with lower-left flexible pipe 29 by bottom right flexible pipe 16 with the three-way connection C30 with solenoid valve, and controls its break-make and realize outside drain function.
Effect of the present invention and benefit are: for realizing water discharge continuous print high-acruracy survey, devise freeing port height dynamic conditioning subsystem and water discharge Automatic continuous detection subsystem.Freeing port height dynamic conditioning subsystem can adjust the height of freeing port in real time according to the height of sample, make freeing port height keep highly equal with the middle part of sample all the time.Because freeing port communicates with air, the pressure in the middle part of such sample is equal with atmospheric pressure, ensure that the accuracy of sample skeleton effective stress.Water discharge Automatic continuous detection subsystem adopts two slender glass burets, utilizes electromagnetic water valve and computing machine control realization to automatically switch, completes the high precision continuous automatic measurement of water discharge.This apparatus structure is dexterous, rationally distributed, measuring accuracy is high, solves water discharge continuous print high-acruracy survey problem.
Accompanying drawing explanation
Fig. 1 is the front view of the real―time precision measurment equipments overall structure that in super large triaxial test, a kind of sample body becomes.
In figure: 1 servomotor; 2 electric cylinder cylinder bodies; 3 gutters; 4 two pass joints; 5 draining buckets; 6 top hoses; 7 right slide blocks; 8 right guide rails; 9 right flexible pipes; 10 right rail support plate; 11 guide supporting rods; 12 system support post A; 13 slender glass buret B; 14 glass tube back up pads; 15 right differential pressure pickups; 16 bottom right flexible pipes; 17 with the three-way connection B of solenoid valve; 18 ring flanges; 19 Bucket Covers; 20 electric cylinder back up pads; 21 left rail back up pads; 22 left sliders; 23 with the three-way connection A of solenoid valve; 24 left flexible pipes; 25 left rails; 26 system support post B; 27 slender glass buret A; 28 left differential pressure pickups; 29 lower-left flexible pipes; 30 with the three-way connection C of solenoid valve.
Fig. 2 is the vertical view of the real―time precision measurment equipments overall structure that in super large triaxial test, a kind of sample body becomes.
In figure: 1 servomotor; 18 ring flanges; 20 electric cylinder back up pads.
Fig. 3 is the left view of the real―time precision measurment equipments overall structure that in super large triaxial test, a kind of sample body becomes.
In figure: 1 servomotor; 2 electric cylinder cylinder bodies; 3 gutters; 4 two pass joints; 5 draining buckets; 6 top hoses; 14 glass tube back up pads; 18 ring flanges; 19 Bucket Covers; 20 electric cylinder back up pads; 21 left rail back up pads; 22 left sliders; 23 with the three-way connection A of solenoid valve; 24 left flexible pipes; 25 left rails; 26 system support post B; 27 slender glass buret A; 29 lower-left flexible pipes; 30 with the three-way connection C of solenoid valve; 31 Weight plates; 32 system support post C.
Fig. 4 is the axonometric drawing of the real―time precision measurment equipments overall structure that in super large triaxial test, a kind of sample body becomes.
In figure: 1 servomotor; 2 electric cylinder cylinder bodies; 3 gutters; 4 two pass joints; 5 draining buckets; 6 top hoses; 10 right rail support plate; 11 guide supporting rods; 12 system support post A; 13 slender glass buret B; 14 glass tube back up pads; 15 right differential pressure pickups; 16 bottom right flexible pipes; 17 with the three-way connection B of solenoid valve; 19 Bucket Covers; 20 electric cylinder back up pads; 22 left sliders; 23 with the three-way connection A of solenoid valve; 24 left flexible pipes; 26 system support post B; 27 slender glass buret A; 28 left differential pressure pickups; 29 lower-left flexible pipes; 30 with the three-way connection C of solenoid valve; 31 Weight plates; 32 system support post C; 33 system support post D.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with technical scheme and accompanying drawing.
As shown in accompanying drawing 1 ~ 4, during assembling, part kerosene cleans, and dries rear matching surface oiling, and each part not finished surface should clean up, removing burr, applying preventive by dipping paint; Be made up of freeing port height dynamic conditioning subsystem and water discharge Automatic continuous detection subsystem in Fig. 1.System support post A12, system support post B26, system support post C32, system support post D33 are fixed on ground, and support fixing freeing port height dynamic conditioning subsystem.Right rail support plate 10 fixes right guide rail 8, and left rail back up pad 21 fixes left rail 25.Right slide block 7 and left slider 22 are fixed on draining bucket 5.Guide supporting rod 11 is used for fixing right rail support plate 10 and left rail back up pad 21.Draining bucket 5 is fixed between right guide rail 8 and left rail 25, and can freely up and down slide.Draining bucket 5 is connected with the output shaft of electric cylinder cylinder body 2.The change of detection of dynamic specimen height in process of the test, servomotor 1 is according to the height highly accurately controlling gutter 3 on draining bucket 5 in real time of sample, ensure that freeing port height is equal with sample middle height, make the pressure in the middle part of sample equal with atmospheric pressure, such accuracy of sample draining.Ensure that draining is accurate, next utilizes water discharge Automatic continuous detection subsystem to complete the automatic detection of water discharge.
Slender glass buret B13 and slender glass buret A27 is fixed on glass tube back up pad 14, and Weight plate 31 plays the effect of the weight such as balance glass tube back up pad 14, slender glass buret B13 and slender glass buret A27, ensure that draining bucket 5 not run-off the straight.With the solenoid control in the three-way connection A23 of solenoid valve through the draining of top hose 6 and right flexible pipe 9 or left flexible pipe 24 break-make.When obtaining electric with the solenoid valve in the three-way connection A23 of solenoid valve, top hose 6 and right flexible pipe 9, slender glass buret B13 conducting, draining enters slender glass buret B13 detects the draining flowing into slender glass buret B13 volume by being arranged on the right differential pressure pickup 15 in below.When the draining of slender glass buret B13 is close to its range 90%, allow with the solenoid valve power-off in the three-way connection A23 of solenoid valve.At this moment draining is through left flexible pipe 24 and slender glass buret A27 conducting, and draining flows to slender glass buret A27.Allow with the solenoid valves in the three-way connection B17 of solenoid valve, slender glass buret B13 realizes outside draining simultaneously, and draining terminates relief with the solenoid valve power-off in the three-way connection B17 of solenoid valve, waits for and measuring next time.Equally, when the draining of slender glass buret A27 is close to its range 90%, allow with the solenoid valves in the three-way connection A23 of solenoid valve.At this moment draining is through right flexible pipe 9 and slender glass buret B13 conducting, and draining flows to slender glass buret B13.Allow with the solenoid valves in the three-way connection C30 of solenoid valve, slender glass buret A27 realizes outside draining simultaneously, and draining terminates relief with the solenoid valve power-off in the three-way connection C30 of solenoid valve, waits for and measuring next time.Like this, control slender glass buret A27 and slender glass buret B13 like this and repeatedly replace the continuous precise measurement that water inlet/draining achieves super large sample water discharge.
Servomotor 1 in electric cylinder adopts high precision position to control formula servomotor, and umber of pulse is 10000/circle.The pitch of leading screw adopts 5mm, has higher movement velocity and position control accuracy, can meet measurement requirement.Right differential pressure pickup 15 nurses one's health into the signal voltage of 0-5V/10V with the sensing element of left differential pressure pickup 28, received by data acquisition unit through 16 A/D conversions, then data acquisition unit sends computing machine to result, judged the timing node of 90% of slender glass buret B13 and slender glass buret A27 by computing machine, control slender glass buret A27 and slender glass buret B13 alternately water inlet/draining repeatedly.Calculate the umber of pulse needed for servomotor 1 according to specimen height, accurately control the height of gutter 3 on draining bucket 5, ensure that freeing port height is equal with sample middle height.
In addition, Weight plate 31 plays the effect of the weight such as balance glass tube back up pad 14, slender glass buret B13 and slender glass buret A27, ensure that draining bucket 5 not run-off the straight.This measurement mechanism structure is dexterous, and easy to operate, low cost of manufacture, has higher using value.

Claims (2)

1. the real―time precision measurment device that in super large triaxial test, a kind of sample body becomes, comprise servomotor (1), electric cylinder cylinder body (2), gutter (3), two pass joints (4), draining bucket (5), top hose (6), right slide block (7), right guide rail (8), right flexible pipe (9), right rail support plate (10), guide supporting rod (11), system support post A (12), slender glass buret B (13), glass tube back up pad (14), right differential pressure pickup (15), bottom right flexible pipe (16), with the three-way connection B (17) of solenoid valve, ring flange (18), Bucket Cover (19), electric cylinder back up pad (20), left rail back up pad (21), left slider (22), with the three-way connection A (23) of solenoid valve, left flexible pipe (24), left rail (25), system support post B (26), slender glass buret A (27), left differential pressure pickup (28), lower-left flexible pipe (29), with the three-way connection C (30) of solenoid valve, Weight plate (31), system support post C (32), system support post D (33), it is characterized in that: system support post A (12), system support post B (26), system support post C (32), system support post D (33) are fixed on ground, and support fixing freeing port height dynamic conditioning subsystem, draining bucket (5) is connected with the output shaft of electric cylinder cylinder body (2), servomotor (1), according to the height highly accurately controlling the upper gutter (3) of draining bucket (5) in real time of sample, ensures that freeing port height is equal with sample middle height, right rail support plate (10) is for fixing right guide rail (8), left rail back up pad (21) is for fixing left rail (25), right slide block (7) and left slider (22) are fixed on draining bucket (5), guide supporting rod (11) is used for fixing right rail support plate (10) and left rail back up pad (21), draining bucket (5) is fixed between right guide rail (8) and left rail (25), and can freely up and down slide, slender glass buret B (13) and slender glass buret A (27) is fixed on glass tube back up pad (14), Weight plate (31) plays the effect of the weight such as balance glass tube back up pad (14), slender glass buret B (13) and slender glass buret A (27), ensures draining bucket (5) not run-off the straight, be the three-way connection A (23) with solenoid valve between top hose (6) and right flexible pipe (9)/left flexible pipe (24), right flexible pipe (9) is connected with slender glass buret B (13), left flexible pipe (24) is connected with slender glass buret A (27), and the three-way connection A (23) with solenoid valve realizes and slender glass buret B (13), slender glass buret A (27) conducting switch operating, right differential pressure pickup (15) is arranged on the below of slender glass buret B (13), left differential pressure pickup (28) is arranged on the below of slender glass buret A (27), right differential pressure pickup (15) and left differential pressure pickup (28) are used for measuring the size of slender glass buret B (13) and the middle water discharge of slender glass buret A (27), three-way connection B (17) with solenoid valve is connected with slender glass buret A (27) with slender glass buret B (13) with lower-left flexible pipe (29) by bottom right flexible pipe (16) with the three-way connection C (30) with solenoid valve, and control its break-make and realize outside drain function.
2. the method for the real―time precision measurment that a kind of sample body becomes in super large triaxial test, it is characterized in that: when the method is by obtaining electric with the solenoid valve in the three-way connection A (23) of solenoid valve, top hose (6) and right flexible pipe (9), slender glass buret B (13) conducting, draining enters slender glass buret B (13); The volume of the draining flowing into slender glass buret B (13) is detected by being arranged on the right differential pressure pickup in below (15); When the draining of slender glass buret B (13) is close to its range 90%, allow with the solenoid valve power-off in the three-way connection A (23) of solenoid valve; Draining is through left flexible pipe (24) and slender glass buret A (27) conducting, draining flows to slender glass buret A (27), allow with the solenoid valves in the three-way connection B (17) of solenoid valve, slender glass buret B (13) realizes outside draining, draining terminates relief with the solenoid valve power-off in the three-way connection B (17) of solenoid valve, waits for and measuring next time; When the draining of slender glass buret A (27) is close to its range 90%, allow with the solenoid valves in the three-way connection A (23) of solenoid valve, draining is through right flexible pipe (9) and slender glass buret B (13) conducting, and draining flows to slender glass buret B (13); Allow with the solenoid valves in the three-way connection C (30) of solenoid valve, slender glass buret A (27) realizes outside draining, draining terminates relief with the solenoid valve power-off in the three-way connection C (30) of solenoid valve, waits for and measuring next time; Control slender glass buret A (27) and slender glass buret B (13) replace the continuous precise measurement that water inlet/draining achieves super large sample water discharge repeatedly.
CN201410578651.9A 2014-10-24 2014-10-24 The real-time precision measurment device that in super large triaxial test, a kind of sample body becomes Active CN104458424B (en)

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CN105180870A (en) * 2015-09-08 2015-12-23 大连理工大学 Hydrostatic transmission large-range displacement two-way detection device

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