CN101936857B - Confining pressure keeping system of rock triaxial creep testing machine - Google Patents
Confining pressure keeping system of rock triaxial creep testing machine Download PDFInfo
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- CN101936857B CN101936857B CN2010102705348A CN201010270534A CN101936857B CN 101936857 B CN101936857 B CN 101936857B CN 2010102705348 A CN2010102705348 A CN 2010102705348A CN 201010270534 A CN201010270534 A CN 201010270534A CN 101936857 B CN101936857 B CN 101936857B
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- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 239000011435 rock Substances 0.000 title claims abstract description 17
- 239000002828 fuel tank Substances 0.000 claims abstract description 23
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 description 36
- 239000010720 hydraulic oil Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 19
- 230000000694 effects Effects 0.000 description 14
- 239000012530 fluid Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012089 stop solution Substances 0.000 description 1
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Abstract
本发明公开了一种岩石三轴蠕变试验机的围压保持系统，液压泵与电动机相连，油箱与液压泵进油口通过滤油器相连，液压泵出油口与油箱之间装有溢流阀，伺服换向阀分别与油箱、液压泵、双行程增压缸及单向阀相连，双行程增压缸内装有限位传感器，双行程增压缸依次与单向阀相连，单向阀与三轴室相连的油路中装有蓄能器、压力表及压力传感器，三轴室通过截止阀与液压泵相连，三轴室通过截止阀油箱相连。本发明充油、放油操作简便，可长时间保持三轴室内的压力恒定，大幅提高了试验精度，有效延长了液压元件的使用寿命。
The invention discloses a confining pressure maintenance system of a three-axis rock creep testing machine. A hydraulic pump is connected with a motor, an oil tank is connected with an oil inlet of the hydraulic pump through an oil filter, and an overflow device is installed between the oil outlet of the hydraulic pump and the oil tank. The flow valve and the servo reversing valve are respectively connected with the fuel tank, hydraulic pump, double-stroke booster cylinder and one-way valve. The double-stroke booster cylinder is equipped with a limit sensor. Accumulators, pressure gauges and pressure sensors are installed in the oil circuit connected with the triaxial chamber, the triaxial chamber is connected with the hydraulic pump through the shut-off valve, and the triaxial chamber is connected with the oil tank through the shut-off valve. The invention is easy to operate for filling and draining oil, can keep the pressure in the three-axis chamber constant for a long time, greatly improves the test accuracy, and effectively prolongs the service life of hydraulic components.
Description
Technical field
The present invention relates to the rock mechanics experiment technical field, the confined pressure that more specifically relates to a kind of rock three axis creep test machine keeps system, is particularly useful for guaranteeing that rock three axis creep test machine keeps constant confining pressure.
Background technology
The rock three axis creep test is an important means of measuring the long-term mechanical behavior of rock, and its test period can reach several months long, several years at most usually.Be usually directed to multistage poor stress (axial compression deducts confined pressure) in the creep test process, in the process that stress at different levels apply, must strictly keep the constant of its value, to guarantee to obtain believable test figure.The present many servo apply hydraulic pressures of creep of rock testing machine are controlled and are realized constant pressure.
Facts have proved, because the axial compression system has simple relatively structure, the pressurized cylinder good sealing effect, process of the test can make axial compression keep constant pressure for a long time by common Hydrauservo System.But the pressurize effect of the confined pressure system of three axis creep test machine is relatively poor at present, is the important technology difficult problem that puzzlement improves rock three axis creep test precision all the time.
The main cause of pressurize weak effect is: the triaxial chamber complex structure, and whenever carrying out a test needs dismounting once, testing machine is behind the process long-play, seal member in the triaxial chamber can produce bigger wearing and tearing, therefore after in triaxial chamber, applying high confining pressure, the situation that can occur the outside oil impregnate of triaxial chamber in the process of the test, the confined pressure behind the oil impregnate in the triaxial chamber must reduce.The confined pressure servo-drive system is after detecting this change, and the element in the confined pressure maintenance systems such as frequent starting hydraulic pump, servo-valve, pumping chamber that have to replenishes hydraulic oil in triaxial chamber, seriously shortened the serviceable life of related elements.In addition, what the pressurized cylinder of the system of confined pressure maintenance at present adopted is the one-way trip pressurized cylinder, in the process of frequent additional hydraulic oil, oil in the hyperbaric chamber can exhaust gradually, this moment the respective valves of having to manually close, by the manual operation servo-drive system, in the hyperbaric chamber, replenish hydraulic oil again, be unfavorable for the maintenance of confined pressure.
Triaxial chamber sealing effectiveness difference is to cause confined pressure can't keep constant first cause for a long time, can't repair seal member in the test of long duration process, also can improve experimentation cost greatly simultaneously even if adopt the higher quality seal parts also can't thoroughly effect a radical cure this problem.Therefore, starting with from pressure charging system and to improve that confined pressure keeps constant effect in the triaxial chamber, is the most feasible thinking of this defective of radical cure.
Summary of the invention
In order to overcome the deficiency of lacking in existing rock three axis creep test machine confined pressure system's pressurize ability and serviceable life, the objective of the invention is to be to provide a kind of confined pressure of rock three axis creep test machine to keep system, this system is oil-filled, it is easy and simple to handle to drain the oil, can keep the constant pressure in the triaxial chamber for a long time, significantly improve test accuracy, and effectively prolonged the test life of Hydraulic Elements.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention partly is made up of fuel tank, oil filter, hydraulic pump, motor, servo reversal valve, retaining valve, double stroke pressurized cylinder, limit sensors, accumulator, tensimeter, pressure transducer, stop valve, surplus valve etc.Its annexation is: hydraulic pump links to each other with motor, fuel tank links to each other by oil filter with the hydraulic pump oil-in, hydraulic oil is housed in the fuel tank, between hydraulic pump oil-out and the fuel tank surplus valve is housed, servo reversal valve respectively with fuel tank, hydraulic pump, double stroke pressurized cylinder and retaining valve link to each other, be equipped with first in the double stroke pressurized cylinder, second limit sensors, the double stroke pressurized cylinder is successively with first, second, the 3rd, the 4th retaining valve links to each other, first, second, the 3rd, in the oil circuit that the 4th retaining valve links to each other with triaxial chamber and it links to each other accumulator is housed, tensimeter and pressure transducer, triaxial chamber can directly be communicated with hydraulic pump or fuel tank or link to each other by stop valve.
Fuel tank links to each other by oil filter with the hydraulic pump oil-in, between hydraulic pump oil-out and the fuel tank surplus valve is housed, and its effect is to prevent that accidents such as oil circuit stops up, pressure rising suddenly from causing hydraulic pump to damage, with the protection hydraulic pump.
First, second limit sensors is housed in the double stroke pressurized cylinder, after the piston in the double stroke pressurized cylinder touches first, second limit sensors, first, second limit sensors feeds back to computerized control system with electric signal, computerized control system and then send signal, activate servo reversal valve, thereby change the trend of the hydraulic oil of hydraulic pump output, make that the double stroke pressurized cylinder can to-and-fro movement, continue supercharging.
The double stroke pressurized cylinder links to each other with first, second, third, fourth retaining valve respectively, plays control hydraulic oil and flows to, and the specific implementation method is introduced at " embodiment " joint.
Triaxial chamber can directly be communicated with hydraulic pump or fuel tank by stop valve; can realize giving in the process of the test triaxial chamber oil-filled and operation of draining the oil fast; improved efficient greatly; avoid hydraulic oil by unnecessary element in the operating process of filling, drain the oil such as servo reversal valve, pressurized cylinder, retaining valve simultaneously, helped protecting respective element.
Pressure transducer directly links to each other with triaxial chamber, and the Monitoring Data of pressure transducer feeds back to computerized control system in the process of the test, has computer to determine when the primer fluid press pump, thereby realizes the servocontrol of confined pressure in the triaxial chamber.
Accumulator directly links to each other with triaxial chamber, and its effect is the pressure surge in the buffering oil circuit, so that the confined pressure in the triaxial chamber is more stable, plays the effect of protection Hydraulic Elements simultaneously.
Tensimeter directly links to each other with triaxial chamber, and its effect is that the confined pressure that can observe intuitively in the triaxial chamber keeps situation, in case the pressure data that situations such as laboratory sudden power cause disappearance.
The invention has the beneficial effects as follows:
1) can for a long time, stably keep the pressure in the triaxial chamber is steady state value, has improved the success of the test rate and the data precision of rock three axis creep test greatly.
2) oil-filled in the process of the test, drain the oil convenient to operation.The conventional test machine is oil-filled, the operation of draining the oil will expend thirty or forty minute usually, and the present invention realizes that these two operations only need a few minutes.
3) can effectively reduce the extent of deterioration of elements such as servo-valve, hydraulic pump, pressurized cylinder, increase substantially the serviceable life of element.Keep the hydraulic pump operation of system to need usually in about 1 year to change once as common confined pressure, adopt system of the present invention after, its life-span can be increased to 2 years.
4) automaticity height.In the test of long duration creep test, the oil-filled operation of draining the oil when finishing during except that on-test, entire test does not need manually to open or close related valve, can realize the unmanned full automatic working, has saved a large amount of manpowers.
5) versatility is good.Be widely used in most rock three axis creep test machines.
Description of drawings
Fig. 1 is that a kind of confined pressure of rock three axis creep test machine keeps system's structural representation.
Numbering corresponding elements name is called among the figure:
The 1-fuel tank, 2-oil filter (as: SFN type), 3-hydraulic pump (as: DYB type), 4-motor (as: QA type), the servo reversal valve of 5-, 6-first retaining valve, 7-second retaining valve, 8-the 3rd retaining valve, 9-the 4th retaining valve, 10-double stroke pressurized cylinder, 11-first limit sensors (as: SL1 type), 12-second limit sensors (as: SL1 type), 13-accumulator (as: NXQ type), the 14-tensimeter, 15-pressure transducer (as: TYC type), 16-first stop valve, 17-second stop valve, 18-the 3rd stop valve, 19-surplus valve (as: Y type), 20-triaxial chamber.
Embodiment
The present invention is further described below in conjunction with accompanying drawing.
The present invention partly is made up of fuel tank 1, oil filter 2, hydraulic pump 3, motor 4, servo reversal valve 5, first retaining valve 6, second retaining valve 7, the 3rd retaining valve 8, the 4th retaining valve 9, double stroke pressurized cylinder 10, first limit sensors 11, second limit sensors 12, accumulator 13, tensimeter 14, pressure transducer 15, first stop valve 16, second stop valve 17, the 3rd stop valve 18, surplus valve 19 etc.Its annexation is: in the fuel tank 1 hydraulic oil is housed, hydraulic pump 3 links to each other with motor 4, fuel tank 1 links to each other by oil filter 2 with hydraulic pump 3 oil-ins, between hydraulic pump 3 oil-outs and the fuel tank 1 surplus valve 19 is housed, servo reversal valve 5 respectively with fuel tank 1, hydraulic pump 3, the double stroke pressurized cylinder 10 and first retaining valve 6, second retaining valve 7 links to each other, first limit sensors 11 is housed in the double stroke pressurized cylinder 10, second limit sensors 12, double stroke pressurized cylinder 10 successively with first retaining valve 6, second retaining valve 7, the 3rd retaining valve 8, the 4th retaining valve 9 links to each other, the 3rd retaining valve 8, in the oil circuit that the 4th retaining valve 9 links to each other with triaxial chamber 20 and it links to each other accumulator 13 is housed, tensimeter 14 and pressure transducer 15, triaxial chamber 20 is by first stop valve 16, second stop valve 17 can directly be communicated with hydraulic pump 3 or link to each other, and triaxial chamber 20 is by first stop valve 16, but the 3rd stop valve 18 fuel tanks 1 directly are communicated with or link to each other.
Fuel tank 1 links to each other by oil filter 2 with hydraulic pump 3 oil-ins, between hydraulic pump 3 oil-outs and the fuel tank 1 surplus valve 19 is housed, and its effect is to prevent that accidents such as oil circuit stops up, pressure rising suddenly from causing hydraulic pump 3 to damage, with protection hydraulic pump 3.
Triaxial chamber 20 can directly be communicated with hydraulic pump 3 by first stop valve 16, second stop valve 17; but triaxial chamber 20 directly is communicated with by first stop valve 16, the 3rd stop valve 18 fuel tanks; can realize the triaxial chamber 20 quick oil-filled and operations of draining the oil in the process of the test; improved operating efficiency greatly; avoid hydraulic oil by unnecessary element in the operating process of filling, drain the oil such as servo reversal valve 5, pressurized cylinder 10, first retaining valve 6, second retaining valve 7, the 3rd retaining valve 8, the 4th retaining valve 9 simultaneously, helped protecting respective element.
Pressure transducer 15 directly links to each other with triaxial chamber 20, and the Monitoring Data of pressure transducer 15 feeds back to computerized control system in the process of the test, determines when primer fluid press pump 3 by computer, thereby realizes the servocontrol of confined pressure in the triaxial chamber 20.
Accumulator 13 directly links to each other with triaxial chamber 20, and its effect is the pressure surge in the buffering oil circuit, so that the confined pressure in the triaxial chamber 20 is more stable, plays the effect of protection Hydraulic Elements simultaneously.
Tensimeter 14 directly links to each other with triaxial chamber 20, and its effect is that the confined pressure that can observe intuitively in the triaxial chamber 20 keeps situation, in case the pressure data that situations such as laboratory sudden power cause disappearance.
The exemplary embodiments of this system in the rock three axis creep test is as follows:
1) triaxial chamber 20 quick oil-filled operations
Servo reversal valve 5 is got to " meta ", and cut-out hydraulic pump 3 is communicated with double stroke pressurized cylinder 10 elements such as grade.Open first stop valve 16, second stop valve 17, close stop valve 18.It is oil-filled in triaxial chamber 20 that actuating motor 4 drives hydraulic pump 3, is full of triaxial chamber 20 up to hydraulic oil, stops motor 4, closes first stop valve 16, second stop valve 17.
2) confined pressure keeps process
Close first stop valve 16, second stop valve 17, the 3rd stop valve 18, primer fluid press pump 3 injects hydraulic oil in triaxial chamber 20, confined pressure in triaxial chamber 20 reaches testing requirements (as 40MPa, 60MPa, 80MPa etc.), begin three axis creep test then, confined pressure keeps process as follows in the process of the test:
(servo reversal valve 5 is in " position, a left side " state to state as shown in drawings, the piston of double stroke pressurized cylinder 10 just moves right), after motor 4 drives hydraulic pump 3 startups, the hydraulic oil of hydraulic pump 3 outputs enters double stroke pressurized cylinder 10 left ends through servo reversal valve 5 and retaining valve 7 large and small plunger shaft, the restriction that is subjected to retaining valve 6 after the hydraulic oil in right-hand member big piston chamber is extruded flows to fuel tank 1 through servo reversal valve 5, hydraulic oil after the chamber supercharging of right-hand member valve piston is through retaining valve 9 outputs, the hydraulic oil of output is subjected to retaining valve 8 restrictions, finally flows into triaxial chamber 20.
The piston of double stroke pressurized cylinder 10 moves on to after right-hand member triggers first limit sensors 11, servo reversal valve 5 is activated as " right position " state, the hydraulic oil of hydraulic pump 3 outputs enters double stroke pressurized cylinder 10 right-hand members through servo reversal valve 5 and retaining valve 6 large and small plunger shaft, the restriction that is subjected to retaining valve 7 after the hydraulic oil in left end big piston chamber is extruded flows to fuel tank 1 through servo reversal valve 5, hydraulic oil after the chamber supercharging of left end valve piston is through retaining valve 8 outputs, the hydraulic oil of output is subjected to retaining valve 9 restrictions, finally flows into triaxial chamber 20.
Like this, after pressure in pressure transducer 15 detects triaxial chamber 20 is lower than limit value, just can primer fluid press pump 3, the continuous to-and-fro movement of the piston of double stroke pressurized cylinder 10, hydraulic oil is just alternately exported at two ends, inject triaxial chamber 20 then, can keep the constant pressure in the triaxial chamber 20 for a long time, thereby significantly improve test accuracy.
3) triaxial chamber 20 operation of draining the oil fast
After several months, three axis creep test finishes.The stop solution press pump is opened first stop valve 16, the 3rd stop valve 18, closes stop valve 17, and the hydraulic oil in the triaxial chamber 20 is emitted, and can use air compressor to squeeze into pressure-air in the process of draining the oil in triaxial chamber, drains the oil more fast with realization.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102705348A CN101936857B (en) | 2010-09-02 | 2010-09-02 | Confining pressure keeping system of rock triaxial creep testing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102705348A CN101936857B (en) | 2010-09-02 | 2010-09-02 | Confining pressure keeping system of rock triaxial creep testing machine |
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| CN101936857A CN101936857A (en) | 2011-01-05 |
| CN101936857B true CN101936857B (en) | 2011-10-26 |
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| CN106438595A (en) * | 2016-11-21 | 2017-02-22 | 天津尚吉液压设备有限公司 | Novel adjustable pressure supply system |
| CN107655761B (en) * | 2017-10-30 | 2021-03-23 | 上海应用技术大学 | Rupture disk pressure relief test system and method |
| CN108956377B (en) * | 2018-05-08 | 2020-03-10 | 中国农业大学 | Food rheological property detection method |
| CN109253927A (en) * | 2018-08-18 | 2019-01-22 | 中山大学 | A kind of permeable circulating pressure room of the all-pass of rock test |
| CN111980879B (en) * | 2020-07-17 | 2021-05-28 | 中南大学 | High pressure pulse fluid output device and rock hydraulic fracturing method |
| CN113339335B (en) * | 2021-06-16 | 2022-11-22 | 海南浙江大学研究院 | Servo actuating system for pressurization ejection |
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| US4152941A (en) * | 1978-05-08 | 1979-05-08 | Terra Tek, Inc. | Process for measuring the fracture toughness of rock under simulated down-hole stress conditions |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH076896B2 (en) * | 1991-12-27 | 1995-01-30 | 株式会社第一科学 | Creep test method and creep test apparatus used therefor |
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2010
- 2010-09-02 CN CN2010102705348A patent/CN101936857B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| US4152941A (en) * | 1978-05-08 | 1979-05-08 | Terra Tek, Inc. | Process for measuring the fracture toughness of rock under simulated down-hole stress conditions |
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| CN2514336Y (en) * | 2001-12-13 | 2002-10-02 | 中国科学院武汉岩土力学研究所 | Double down-pressing plate type pressure-bearing device for rock three-shaft experiment instrument |
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Inventor after: Shi Xilin Inventor after: Li Yinping Inventor after: Yang Chunhe Inventor after: Ma Hongling Inventor after: Yao Yuanfeng Inventor after: Jing Wenjun Inventor before: Shi Xilin Inventor before: Li Yinping Inventor before: Yang Chunhe |
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