CN102435718A - Universal digital display detection and calibration device for pressure test of soil test instrument - Google Patents
Universal digital display detection and calibration device for pressure test of soil test instrument Download PDFInfo
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- CN102435718A CN102435718A CN2011102819841A CN201110281984A CN102435718A CN 102435718 A CN102435718 A CN 102435718A CN 2011102819841 A CN2011102819841 A CN 2011102819841A CN 201110281984 A CN201110281984 A CN 201110281984A CN 102435718 A CN102435718 A CN 102435718A
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- 238000012360 testing method Methods 0.000 title claims abstract description 75
- 238000001514 detection method Methods 0.000 title abstract description 14
- 239000002689 soil Substances 0.000 title abstract description 10
- 239000000523 sample Substances 0.000 claims abstract description 59
- 238000009434 installation Methods 0.000 claims description 22
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 7
- 239000011324 bead Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000009530 blood pressure measurement Methods 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001417495 Serranidae Species 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The invention relates to a universal digital display detection and calibration device for pressure test of a soil test instrument, which consists of a pressure test standard probe and a digital display electrometer, wherein the standard probe consists of a cylindrical support body and a force measuring disk which form a main body, resistance strain gauges connected in a Wheatstone bridge mode are symmetrically distributed on the circumference of the bottom surface of the force measuring disk, the maximum measuring range is divided into 5KN and 20KN, a front panel of the digital display electrometer is provided with a 5KN measuring range selection switch, a 20KN measuring range selection switch, a 5KN and 20KN standard probe initial value zero setting knob, a 4-bit half LED display with an A/D conversion circuit and a multiplying power display selection key switch, and the multiplying power display selection switch is provided with 1 axial force display gear and 3 stress display. The device can carry out on-line detection and calibration on pressure test channels of each consolidometer, a direct shear instrument, a K0 instrument, a triaxial apparatus and a CBR instrument after being calibrated by a standard dynamometer so as to ensure that the pressure measurement data is accurate and reliable, and the device has the outstanding advantages of convenient movement, easy operation and visual display.
Description
Technical field
The invention belongs to the detection correcting device, particularly relate to the general digital display of a kind of earthwork test Instrument pressure test and detect calibrating installation.
Background technology
To the effect that the physico-mechanical properties of foundation soil is tested for one of soil test, for building lot and Structure Calculation provide corresponding strength and deformation parameter.
The foundation soil test specimen is applied certain force from different directions; The power test of observing its stress deformation relation and writing down whole process is the basic test means of earthwork test Instrument; For example fixed, shearing, coefficient of horizontal pressure (K0), three are sheared all to relate to conventional mechanical test such as CBR appearance test specimen are applied different differential axial forces; Make sample produce distortion, and carry out omnidistance record as the foundation that various relation curves and data result are provided.Therefore power (stress) and displacement (strain) are that each test specimen carries out the indispensable test parameters of mechanical test, usually obtaining as a measurement passage, like dynamometry passage, displacement measurement passage with a test parameters.
With consolidometer or direct shear apparatus is example, and domestic each big-and-middle-sized soil mechanics laboratory has hundreds of even more pilot passageway and microcomputer respectively and links and form a huge soil test automated network.
So numerous long-term continuous workings of earthwork test Instrument is in dust and immersion environment, and whether its measuring accuracy changes, whether true and accurate should detect calibration through specialized equipment to measurement result.
Yet, still do not have in the soil test operation at present and be applicable to that testing laboratory detects the conventional equipment of calibration as the precision to aforementioned earthwork test Instrument power and stress test passage.
Summary of the invention
The purpose of this invention is to provide the general digital display of a kind of earthwork test Instrument pressure test and detect calibrating installation; This device utilizes the counterforce device of the existing test apparatus of testing laboratory and standard force-measuring meter to carry out self detection demarcation, is applicable to that various consolidometer, direct shear apparatus, K0 appearance, CBR appearance and triaxial apparatus pressure test passage detect calibration and stability test.
The present invention takes following technical scheme for realizing above-mentioned purpose: this general digital display detects calibrating installation and is made up of the standard probe and the pressure test digital display electric pilot that are used for pressure test; Said standard probe by cylindric supporter, be arranged at cylindric supporter upper edge hole circle the dynamometry dish and be arranged at the dynamometry dish center of circle and constitute main body with the perpendicular double-screw bolt of dynamometry dish card; Said cylindric supporter, dynamometry dish and double-screw bolt are integrated members; Said double-screw bolt is threaded and earthwork test Instrument polishing head force transmission joint that is connected mutually and the set nut that acts on force transmission joint; It is 4 resistance strain gages that the benchmark circumference is symmetrically distributed and the stickup fixed resistance value equates with its center of circle that said dynamometry is tried to get to the heart of a matter surperficial; Each resistance strain gage connects by wheatstone bridge; The power end of this electric bridge is connected with patch-type thermo-compensator one end that is pasted and fixed on cylindric supporter madial wall respectively; Two output terminals of each patch-type thermo-compensator other end and electric bridge are electrically connected with the corresponding contact of socket of the cable-to-cable connector that is arranged on cylindric supporter one side; The diameter of said standard probe dynamometry dish and cylindric supporter is 90-118mm, and cylindric supporter wall thickness 25-30mm, maximum range are divided into two kinds of 5KN and 20KN; Said pressure test digital display electric pilot comprises cabinet, circuit board and accurate stabilized voltage supply; 4 half light-emitting diode displays and multiplying power that said case front panel is provided with 5KN, 20KN range switch, 5KN and 20KN standard probe initial value zeroing knob, have an A/D change-over circuit show selects key switch; Said multiplying power shows that selecting key switch to be provided with 1 axial force shows that shelves and 3 stress show shelves, and said cabinet rear panel is provided with the cable-to-cable connector that connects 5KN, 20KN standard probe respectively; Said circuit board is by the standard probe measurement range selection that connects successively and initial value zeroing circuit, precision instrument amplifier circuit, low-pass filter circuit and axial force---stress multiplying power transfer resistance bleeder circuit is formed; Said standard probe measurement range selection and initial value zeroing circuit are by SS and be connected to 5KN and pop one's head in precision resistor and resistance between two output terminals of 20KN standard is in series and constitutes; Said precision instrument amplifier circuit output terminal is connected in the low-pass filter that is made up of RC and operational amplifier; The low-pass filter output terminal is connected in axial force value output circuit input end and 3 tunnel axial forces that are made up of current-limiting resistance---stress multiplying power transfer resistance bleeder circuit input end; Axial force value output circuit output terminal is connected in multiplying power and shows that the axial force of selecting key switch shows the optional end of shelves; Each resistor voltage divider circuit output terminal is connected to multiplying power and shows that 3 stress of selection key switch show the optional end of shelves; The output voltage of said 3 tunnel axial forces---stress multiplying power transfer resistance bleeder circuit is respectively 1/20.43,1/30 and 1/50 of a resistor voltage divider circuit input terminal voltage, and multiplying power shows that the public stiff end of selecting each gear of key switch is connected in the A/D change-over circuit input end of 4 half light-emitting diode displays.
The present invention can also take following technical measures:
Bead is provided with the chassis at the bottom of the cylindric supporter of said standard probe.
Said maximum range is that its dynamometry disc thickness of standard probe of 5KN is 6-8mm.
Said maximum range is that its dynamometry disc thickness of standard probe of 20KN is 10-14mm.
The force transmission joint of said standard probe is positive hexagonal column, and its top is provided with recess or internal thread connecting hole.
Said precision instrument amplifier circuit is provided with the gain adjustment circuit that is made up of precision resistor and resistance series connection and is serially connected with the temperature-compensation circuit that is made up of thermistor in the final stage feedback circuit.
Beneficial effect of the present invention and advantage are: it is to aim at the earthwork test Instrument pressure channel to carry out detection calibration and design that this general digital display detects a calibrating installation; The standard probe is connected energising with pressure test digital display electric pilot;, self check can the dynamometry passage of earthwork test Instruments such as consolidometer, direct shear apparatus, K0 appearance, CBR appearance and triaxial apparatus be detected after demarcating; With pressure test digital display electric pilot reading is that benchmark is calibrated tested passage, thereby can guarantee the true and reliable of tested channel pressure output data.This detection calibrating installation is except that direct demonstration axial force; Still can be converted into stress by conventional instrument sample area, and show measurement result with numeral, more current standard force-measuring meter commonly used shows more accurately directly perceived with the clock gauge scale; Resolution also has raising, and effect is good.The standard probe of this device has profile and the installation and application identical with the soil sample test volumetric standard; The height of force transmission joint can also be adjusted and by set nut locking, so this detection calibrating installation is applicable to variously have the earthwork test Instrument of pressure test passage and have versatility.That the present invention has is easy to use, can carry out online detection calibration to various earthwork test Instruments with pressure test passage, guarantees the outstanding really and accurately advantage of said instrument test data.
Description of drawings
Accompanying drawing 1 is a standard probe embodiments structure partial diagrammatic cross-section of the present invention.
Accompanying drawing 2 is that the resistance strain gage and the thermo-compensator of standard probe arranged synoptic diagram.
Accompanying drawing 3 is force transmission joint synoptic diagram that the top is provided with recess.
Accompanying drawing 4 is force transmission joint synoptic diagram that the top is provided with the internal thread connecting hole.
Accompanying drawing 5 is standard probe electrical schematic diagrams.
Accompanying drawing 6 is pressure test digital display electric pilot structural representations of the present invention.
Accompanying drawing 7 is electrical schematic diagrams of the present invention.
Mark among the figure: 1 cylindric supporter, 2 dynamometry dishes, 3 double-screw bolts, 4 force transmission joints, 4-1 recess; 4-2 internal thread connecting hole, 5 set nuts, 6 cable-to-cable connectors, 7 chassis; 8 resistance strain gages, 9 patch-type thermo-compensators, 10 cabinets, 11 4 half light-emitting diode displays; 12 multiplying powers select to show key switch, 13 range switchs, 14 5KN standards probe initial value zeroing knob, 15 20KN standards probe initial value zeroing knob.
Embodiment
Further specify the present invention below in conjunction with embodiment and accompanying drawing thereof.
This general digital display detects calibrating installation and is made up of the standard probe and the pressure test digital display electric pilot that are used for pressure test.
Like Fig. 1, the sonde configuration of standard shown in 2 embodiment, it constitutes main body by cylindric supporter 1, the double-screw bolt 3 that is arranged at the circular dynamometry dish 2 of cylindric supporter upper edge hole and is arranged at the dynamometry dish center of circle, and cylindric supporter, dynamometry dish and double-screw bolt are integrated members.Double-screw bolt 3 is threaded and earthwork test Instrument polishing head force transmission joint 4 that is connected mutually and the set nut 5 that acts on force transmission joint.
Basal surface at dynamometry dish 2 is 4 resistance strain gages 8 that the benchmark circumference is symmetrically distributed and the stickup fixed resistance value equates with its center of circle; Paste fixing two patch-type thermo-compensators 9 at cylindric supporter 1 madial wall, a side of cylindric supporter 1 is provided with the socket of cable-to-cable connector 6.Cylindric supporter 1 end bead is provided with by the fastening chassis 7 of screw.
The force transmission joint 4 of Fig. 1 embodiment is positive hexagonal columns; Recess 4-1 as shown in Figure 3 can be set at its top; Or internal thread connecting hole 4-2 as shown in Figure 4 is set at its top, select the force transmission joint of different length and top structure that standard is popped one's head in and be connected mutually with various polishing heads with earthwork test Instrument of pressure test passage.
The electrical connection of standard probe is as shown in Figure 5; 4 resistance strain gage R0 that resistance equates connect by wheatstone bridge; The power end of electric bridge is connected with V2+, the V2-of D.C. regulated power supply through patch-type thermo-compensator Rt1, Rt2 and cable-to-cable connector respectively, and the output terminal OUTPUT1 of electric bridge, OUTPUT2 export through cable-to-cable connector.
The diameter range of Fig. 1 standard probe dynamometry dish and cylindric supporter is 90-118mm; So that adapt to different earthwork test Instrument pressure test passage minimum spaces; The maximum range of standard probe is divided into two kinds of 5KN and 20KN; Its overall dimensions are identical, and the test pressure that can satisfy the related various earthwork test Instruments of this device detects proofreaies and correct needs.
This standard probe dynamometry disc thickness should be taken all factors into consideration factors such as steel material, tubular supporter wall thickness and corrosion resistance; The design of dynamometry disc thickness must meet the following conditions: promptly dynamometry dish generation elastic deformation and pressure are the linear positive relation under the maximum pressure effect in range ability, in the limit of elasticity scope, will keep enough sensitivity and dynamometry dishes residual deformation can not occur.The steel that Fig. 1 embodiment is selected for use are OCr18Ni12Mo (316) stainless steel barses, and dynamometry dish diameter is 100mm, and tubular supporter wall thickness 25-30mm all can.Its dynamometry disc thickness of the standard of maximum range 5KN probe the 6-8mm scope with interior all can, its dynamometry disc thickness of standard probe of maximum range 20KN all can with interior in the 10-14mm scope.
The pressure test digital display electric pilot embodiment that this general digital display detects calibrating installation is as shown in Figure 6, comprises circuit board and accurate stabilized voltage supply that cabinet 10 and the acceptance criteria probe in the cabinet are exported.
Cabinet 10 front panels are provided with range switch 13,5KN standard probe initial value zeroing knob 14 and the 20KN standard probe initial value zeroing knob 15 of 5KN, 20KN two gears.Front panel also is provided with 4 half light-emitting diode displays 11 that have the A/D change-over circuit and shows selection key switch 12 with multiplying power, and this key switch is 4 double-pole interlock switchs, is provided with 1 axial force and shows that shelves and 3 stress show shelves, and the while can only have one the tunnel to be communicated with.Cabinet 10 rear panels are provided with the cable-to-cable connector (not shown) that connects 5KN, 20KN standard probe respectively.
As shown in Figure 7, the circuit board of pressure test digital display electric pilot is by the standard probe measurement range selection that connects successively and initial value zeroing circuit, precision instrument amplifier circuit, low-pass filter circuit and axial force---stress multiplying power transfer resistance bleeder circuit is formed.
Standard probe initial value zeroing circuit is in series and constitutes by being connected in pop one's head in precision resistor W1, the W2 resistance identical with the two ends resistance between two output terminals of 5KN or 20KN standard respectively, and 5KN or 20KN standard two output terminals of popping one's head in are connected in precision instrument amplifier circuit input end through range switch 13 respective switch positions respectively.
Standard probe measurement range selection and initial value zeroing circuit by be connected to 5KN and 20KN standard pop one's head in two output terminals range switch and be connected to pop one's head in precision resistor and resistance between two output terminals of each standard and be in series and constitute; Range switch is the range switch 13 of Fig. 6, and precision resistor W1, W2 are 5KN standard probe initial value zeroing knob 14 and the 20KN standard probe initial value zeroing knob 15 of Fig. 6.
Among Fig. 7; The precision instrument amplifier circuit of being made up of integrated transporting discharging IC1, IC2 and IC3 is a typical circuit commonly used in the prior art; Be provided with the gain adjustment circuit that constitutes by precision resistor W3 and resistance series connection between the reverse input end of two prime integrated transporting discharging IC1, IC2, the temperature-compensation circuit that serial connection is made up of thermistor Rt5 in the feedback circuit of IC3.
Among Fig. 7; Precision instrument amplifier circuit output terminal is connected in the low-pass filter that is made up of integrated operational amplifier IC4 and RC; Low-pass filter output terminal and the axial force value output circuit input end and 3 tunnel axial forces that are made up of current-limiting resistance R1---stress multiplying power transfer resistance bleeder circuit input end is connected, and each resistor voltage divider circuit is made up of divider resistance series connection before and after precision resistor W4, W5, W6 and each precision resistor respectively.Axial force value output circuit output terminal is connected in multiplying power and shows that selecting key switch is the optional end of axial force demonstration shelves of the multiplying power demonstration selection key switch 12 of Fig. 1; Each resistor voltage divider circuit output terminal is connected to multiplying power and shows that 3 stress selecting key switch show the optional end of shelves, and multiplying power shows that the public stiff end of selecting each gear of key switch is connected in the A/D change-over circuit input end of 4 half light-emitting diode displays.
The axial force value output circuit input voltage and the output voltage ratio of this pressure test digital display electric pilot are 1: 1; The display unit of display is ' N '; The output voltage of 3 tunnel axial forces---stress multiplying power transfer resistance bleeder circuit is respectively 1/20.43,1/30 and 1/50 of a resistor voltage divider circuit input terminal voltage, and the display unit of display is ' KPa '.
Being provided with of 3 tunnel axial forces---stress multiplying power transfer resistance bleeder circuit multiplying power is consistent with following geotechnological instrument polishing head area or sample area respectively, and promptly CBR appearance polishing head area is 20.43cm
2, sample areas such as consolidometer, direct shear apparatus, K0 appearance are respectively cm
2Or 50cm
2, be the legal unit of measurement regulation (1N/cm of stress according to the stressed size of unit area
2=10KPa) adopt the multiplying power circuit to convert axial force into stress, simplified the unit conversion operation in the detection calibration process greatly.
Below the method for application of concise and to the point this detections of narration calibrating installation: at first standard probe is connected in series with the standard force-measuring meter of process CMA and places testing laboratory to have the for example dynamometry position of the counterforce device of CBR appearance of test apparatus now, contact but do not stress with polishing head up and down respectively.The initial value zeroing knob zeroing of the pressure test digital display electric pilot through this detection calibrating installation, and the initial reading of record standard dynamometer clock gauge.Counterforce device loading through test apparatus; Standard probe and the loading of standard force-measuring meter to serial connection extremely necessarily make it keep stable after the axial force; Standard force-measuring reading in through CMA is as the criterion, and the reading that makes this pressure test digital display electric pilot through gain adjustment circuit or both errors consistent with axial force value after the reading of standard force-measuring meter clock gauge converts are in allowed band.
Using aforementioned same procedure in this standard probe range ability, to be divided into 5-6 measuring point demarcates; The difference of the axial force value after displayed value and the standard force-measuring meter reading of this calibrating installation are converted all should≤(permissible error of the present invention is decided to be 0.5% to permissible error; Be higher than GB (GB/T15406-94) 5.6.1 bar and stipulate a magnitude of 1%, be convenient to detect the dynamometry device of each earthwork test Instrument).In the above-mentioned process that this calibrating installation is demarcated, comprise adjustment to temperature-compensation circuit.
After confirming the accuracy and qualified stability of this test calibration device, can carry out that accuracy is calibrated and Detection of Stability is calibrated to the dynamometry passage value of exerting oneself of respectively testing of various earthwork test Instruments with pressure test passage such as consolidometer, direct shear apparatus, triaxial apparatus, CBR appearance and K0 appearance.With the standard probe placement of this detection calibrating installation sample and container position, to substitute the soil sample and the test chamber of passage to be detected at passage to be detected.In the loading process; Record is this device and Earthwork Experiment Data acquisition system terminal CRT reading relatively; Be as the criterion with this calibrating installation reading the electrical measurement of passage to be detected part or other corresponding pressures partially are carried out online adjustment; Make passage to be detected be in normal operating conditions, thereby guarantee passage output data to be detected accurately and reliably.
Claims (6)
1. the general digital display of earthwork test Instrument pressure test detects calibrating installation; It is characterized in that: standard probe and pressure test digital display electric pilot by being used for pressure test are formed; Said standard probe by cylindric supporter, be arranged at cylindric supporter upper edge hole circle the dynamometry dish and be arranged at the dynamometry dish center of circle and constitute main body with the perpendicular double-screw bolt of dynamometry dish card; Said cylindric supporter, dynamometry dish and double-screw bolt are integrated members; Said double-screw bolt is threaded and earthwork test Instrument polishing head force transmission joint that is connected mutually and the set nut that acts on force transmission joint; It is 4 resistance strain gages that the benchmark circumference is symmetrically distributed and the stickup fixed resistance value equates with its center of circle that said dynamometry is tried to get to the heart of a matter surperficial; Each resistance strain gage connects by wheatstone bridge; The power end of this electric bridge is connected with patch-type thermo-compensator one end that is pasted and fixed on cylindric supporter madial wall respectively, and two output terminals of each patch-type thermo-compensator other end and electric bridge are electrically connected with the corresponding contact of socket of the cable-to-cable connector that is arranged on cylindric supporter one side, and the diameter of said standard probe dynamometry dish and cylindric supporter is 90-118mm; Cylindric supporter wall thickness 25-30mm, maximum range are divided into two kinds of 5KN and 20KN; Said pressure test digital display electric pilot comprises cabinet, circuit board and accurate stabilized voltage supply; 4 half light-emitting diode displays and multiplying power that said case front panel is provided with 5KN, 20KN range switch, 5KN and 20KN standard probe initial value zeroing knob, have an A/D change-over circuit show selects key switch; Said multiplying power shows that selecting key switch to be provided with 1 axial force shows that shelves and 3 stress show shelves, and said cabinet rear panel is provided with the cable-to-cable connector that connects 5KN, 20KN standard probe respectively; Said circuit board is by the standard probe measurement range selection that connects successively and initial value zeroing circuit, precision instrument amplifier circuit, low-pass filter circuit and axial force---stress multiplying power transfer resistance bleeder circuit is formed; Said standard probe measurement range selection and initial value zeroing circuit are by SS and be connected to 5KN and pop one's head in precision resistor and resistance between two output terminals of 20KN standard is in series and constitutes; Said precision instrument amplifier circuit output terminal is connected in the low-pass filter that is made up of RC and operational amplifier; The low-pass filter output terminal is connected in axial force value output circuit input end and 3 tunnel axial forces that are made up of current-limiting resistance---stress multiplying power transfer resistance bleeder circuit input end; Axial force value output circuit output terminal is connected in multiplying power and shows that the axial force of selecting key switch shows the optional end of shelves; Each resistor voltage divider circuit output terminal is connected to multiplying power and shows that 3 stress of selection key switch show the optional end of shelves; The output voltage of said 3 tunnel axial forces---stress multiplying power transfer resistance bleeder circuit is respectively 1/20.43,1/30 and 1/50 of a resistor voltage divider circuit input terminal voltage, and multiplying power shows that the public stiff end of selecting each gear of key switch is connected in the A/D change-over circuit input end of 4 half light-emitting diode displays.
2. general digital display according to claim 1 detects calibrating installation, it is characterized in that: bead is provided with the chassis at the bottom of the cylindric supporter of said standard probe.
3. general digital display according to claim 1 detects calibrating installation, it is characterized in that: said maximum range is that its dynamometry disc thickness of standard probe of 5KN is 6-8mm.
4. general digital display according to claim 1 detects calibrating installation, it is characterized in that: said maximum range is that its dynamometry disc thickness of standard probe of 20KN is 10-14mm.
5. general digital display according to claim 1 detects calibrating installation, it is characterized in that: the force transmission joint of said standard probe is positive hexagonal column, and its top is provided with recess or internal thread connecting hole.
6. general digital display according to claim 1 detects calibrating installation, it is characterized in that: said precision instrument amplifier circuit is provided with the gain adjustment circuit that is made up of precision resistor and resistance series connection and is serially connected with the temperature-compensation circuit that is made up of thermistor in the final stage feedback circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110281984.1A CN102435718B (en) | 2011-09-22 | 2011-09-22 | Common digital display detection calibrating device for soil test instrument pressure measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110281984.1A CN102435718B (en) | 2011-09-22 | 2011-09-22 | Common digital display detection calibrating device for soil test instrument pressure measurement |
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| CN102435718A true CN102435718A (en) | 2012-05-02 |
| CN102435718B CN102435718B (en) | 2014-11-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507358A (en) * | 2011-12-05 | 2012-06-20 | 中铁第五勘察设计院集团有限公司 | Calibrating device of dynamic deformation modulus tester |
| CN103792335A (en) * | 2014-01-07 | 2014-05-14 | 陕西理工学院 | Consolidometer information calibration system |
| CN104697877A (en) * | 2015-02-11 | 2015-06-10 | 中铁第五勘察设计院集团有限公司 | Method for automatically checking foundation coefficient tester |
| CN105891038A (en) * | 2015-01-14 | 2016-08-24 | 中国矿业大学(北京) | Triaxial loading calibrator for industrial CT and calibration process |
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|---|---|---|---|---|
| US4649741A (en) * | 1985-08-22 | 1987-03-17 | Geomatic | Insitu soil shear measurement apparatus |
| CN101013108A (en) * | 2007-02-02 | 2007-08-08 | 清华大学 | Bending unit measuring system |
| CN200968919Y (en) * | 2006-11-13 | 2007-10-31 | 胡新国 | Weight automatic adding-unloading device of lever type geotechnical tester |
| CN202256318U (en) * | 2011-09-22 | 2012-05-30 | 铁道第三勘察设计院集团有限公司 | Universal digital display detecting and calibrating device for soil test apparatus pressure testing channel |
-
2011
- 2011-09-22 CN CN201110281984.1A patent/CN102435718B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4649741A (en) * | 1985-08-22 | 1987-03-17 | Geomatic | Insitu soil shear measurement apparatus |
| CN200968919Y (en) * | 2006-11-13 | 2007-10-31 | 胡新国 | Weight automatic adding-unloading device of lever type geotechnical tester |
| CN101013108A (en) * | 2007-02-02 | 2007-08-08 | 清华大学 | Bending unit measuring system |
| CN202256318U (en) * | 2011-09-22 | 2012-05-30 | 铁道第三勘察设计院集团有限公司 | Universal digital display detecting and calibrating device for soil test apparatus pressure testing channel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507358A (en) * | 2011-12-05 | 2012-06-20 | 中铁第五勘察设计院集团有限公司 | Calibrating device of dynamic deformation modulus tester |
| CN102507358B (en) * | 2011-12-05 | 2013-07-17 | 中铁第五勘察设计院集团有限公司 | Calibrating device of dynamic deformation modulus tester |
| CN103792335A (en) * | 2014-01-07 | 2014-05-14 | 陕西理工学院 | Consolidometer information calibration system |
| CN105891038A (en) * | 2015-01-14 | 2016-08-24 | 中国矿业大学(北京) | Triaxial loading calibrator for industrial CT and calibration process |
| CN104697877A (en) * | 2015-02-11 | 2015-06-10 | 中铁第五勘察设计院集团有限公司 | Method for automatically checking foundation coefficient tester |
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| Publication number | Publication date |
|---|---|
| CN102435718B (en) | 2014-11-26 |
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