CN110259743A - A kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine - Google Patents
A kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine Download PDFInfo
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- CN110259743A CN110259743A CN201910547055.7A CN201910547055A CN110259743A CN 110259743 A CN110259743 A CN 110259743A CN 201910547055 A CN201910547055 A CN 201910547055A CN 110259743 A CN110259743 A CN 110259743A
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- Prior art keywords
- hydraulic cylinder
- oil
- valve
- hydraulic
- testing machine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
- F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a kind of hydraulic cylinder autonomous control systems of rock triaxial creep testing machine, including fuel tank, two-position four-way solenoid directional control valve and several hydraulic cylinders in parallel in three axis direction of rock, the fuel tank is connected with oil filter, oil filter is connected with hydraulic pump, the hydraulic pump is connected with motor, the output end and fuel tank of the hydraulic pump are connected to the output end of two-position four-way solenoid directional control valve, two output ends of the two-position four-way solenoid directional control valve are separately connected there are two three two electric change valves, two output ends of three two electric change valves are connected separately with the first reversal valve and the second reversal valve in parallel, the current limliting of first reversal valve and the second reversal valve is contrary, the parallel outputs of first reversal valve and the second reversal valve described in two groups are separately connected the oil inlet and oil return opening of hydraulic cylinder, this hair It is bright to provide a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine that the scope of application is good.
Description
Technical field
The present invention relates to rock test equipment field, the hydraulic cylinder for being more particularly to a kind of rock triaxial creep testing machine is only
Vertical control system.
Background technique
Rock triaxial creep testing is the important means for measuring the long-term mechanical behavior of rock, and test period is usually up to number
It is more then as long as the several years as long as month.It is usually directed to multistage poor stress (axis pressure subtracts confining pressure) during creep test, in stress at different levels
During application, it is necessary to keep the constant of its magnitude, strictly to ensure to obtain believable test data.Current creep of rock
Testing machine mostly uses hydraulic servocontrol to realize that pressure is constant, is all made of whole control, i.e. single side in existing three axis test
It is whole to press to rock, single-point pressure cannot be carried out for different rocks, or pressure area is adjusted according to rock size, therefore
The sphere of action and specific aim of its scope of application and power receive certain limitation.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of liquid of the good rock triaxial creep testing machine of scope of application
Cylinder pressure autonomous control system.
To achieve the above object, the present invention provides the following technical scheme that a kind of rock triaxial creep testing machine it is hydraulic
Cylinder autonomous control system, including fuel tank, two-position four-way solenoid directional control valve and several parallel connections in three axis direction of rock
Hydraulic cylinder, the fuel tank are connected with oil filter, and oil filter is connected with hydraulic pump, and the hydraulic pump is connected with motor, the liquid
The output end and fuel tank of press pump are connected to the output end of two-position four-way solenoid directional control valve, and the two of the two-position four-way solenoid directional control valve
A output end is separately connected there are two three two electric change valves, and two output ends of three two electric change valves divide
It is not connected with the first reversal valve and the second reversal valve in parallel, the current limliting direction phase of first reversal valve and the second reversal valve
Instead, the parallel outputs of the first reversal valve and the second reversal valve described in two groups are separately connected the oil inlet and oil return opening of hydraulic cylinder.
It further further include quick oil-filled pipeline, the both ends of the quickly oil-filled pipeline are separately connected the output of hydraulic pump
The oil inlet at end and hydraulic cylinder, the quickly oil-filled pipeline are equipped with shut-off valve.
Accumulator is equipped at the oil inlet of the further hydraulic cylinder.
Pressure sensor is equipped at the oil inlet of the further hydraulic cylinder.
The pressure gauge connecting with pressure sensor is equipped at the oil inlet of the further hydraulic cylinder.
The output end of the further hydraulic pump is connected with third check valve.
The oil returning tube of the further two-position four-way solenoid directional control valve and fuel tank be equipped with wind cooling oil cooler and
Oil filter.
It further include further air compressor machine, the air compressor machine connection liquid cylinder pressure, the pipeline of the air compressor machine connection liquid cylinder pressure
It is equipped with air cleaner.
Liquid level thermometer is connected on the further fuel tank.
Overflow valve is equipped between the further fuel tank and quickly oil-filled pipeline.
In conclusion the present invention corresponds to each point on three axis of rock, and hydraulic cylinder of the invention due to each hydraulic cylinder
It is all in parallel, so that each hydraulic cylinder can be controlled individually, when carrying out the control of single hydraulic cylinder, as long as making it
Three two electric change valves on its hydraulic cylinder output end and input terminal are adjusted to left position and namely end position, thus
It can press to rock single-point, improve its scope of application, and can test rock single-point specific aim.
Detailed description of the invention
Fig. 1 is a kind of oil circuit figure of the hydraulic cylinder autonomous control system of rock triaxial creep testing machine of the present invention.
Mark explanation: 1, fuel tank；2, motor；3, oil filter；4, liquid level thermometer；5, wind cooling oil cooler；6, it overflows
Flow valve；7, third check valve；8, quick oil-filled pipeline；9, pressure gauge；10, shut-off valve；11, air cleaner；12, air compressor machine；
13, hydraulic cylinder；14, pressure sensor；15, accumulator；16, the first check valve；17, second one-way valve；18, three two-way electromagnetism
Reversal valve；19, two-position four-way solenoid directional control valve；20, hydraulic pump.
Specific embodiment
Referring to Fig.1 to a kind of embodiment of the hydraulic cylinder autonomous control system of rock triaxial creep testing machine of the present invention make into
One step explanation.
A kind of 13 autonomous control system of hydraulic cylinder of rock triaxial creep testing machine, including fuel tank 1, two-position four-way electromagnetism change
Several hydraulic cylinders 13 in parallel to valve 19 and in three axis direction of rock, the fuel tank 1 are connected with oil filter 3, oil strain
Device 3 is connected with hydraulic pump 20, and the hydraulic pump 20 is connected with motor 2, and the output end and fuel tank 1 of the hydraulic pump 20 are connected to
Two output ends of the output end of two-position four-way solenoid directional control valve 19, the two-position four-way solenoid directional control valve 19 are connected separately with two
A three two electric change valves 18, two output ends of three two electric change valves 18 are connected separately in parallel the
The current limliting of one reversal valve and the second reversal valve, first reversal valve and the second reversal valve is contrary, and first changes described in two groups
The oil inlet and oil return opening of hydraulic cylinder 13 are separately connected to the parallel outputs of valve and the second reversal valve.
As shown in Figure 1,19 left position of two-position four-way solenoid directional control valve is oil inlet position, right position is oil return position, three two-way electromagnetism
Left position in reversal valve 18 is cut-off position, and second one-way valve 17 is connected in middle position, and the first check valve 16 is connected in right position, hydraulic in progress
When the piston rod movement of cylinder 13 is with rock contact to be measured, hydraulic cylinder 13 connects the left position of two-position four-way solenoid directional control valve 19,
So that pressure has the input terminal for arriving at three two electric change valves 18, three that 13 output end of hydraulic cylinder is connected in the present embodiment
Two electric change valves 18 are located at right position and connect the first check valve 16, connect three two-way electromagnetic switch of 13 input terminal of hydraulic cylinder
Valve 18 is located at middle position and connects second one-way valve 17, and pressure oil is entered in hydraulic cylinder 13 by second one-way valve 17, driving hydraulic cylinder
13 piston motion, while the hydraulic oil being extruded in hydraulic cylinder 13 is connected by the first check valve 16 from 13 output end of hydraulic cylinder
The discharge of three two electric change valves 18, fuel tank 1 is flowed back to by logical two-position four-way solenoid directional control valve 19, is sequentially completed each liquid
The position of 13 piston rod of cylinder pressure is adjusted, so that being squeezed in three axis direction of rock by hydraulic cylinder 13.
When regulating the position of 13 piston of hydraulic cylinder, then to pressing in three axis direction of rock, only need at this time
Three two electric change valves 18 that hydraulic cylinder 13 connects output end are adjusted to left position or middle position, so that hydraulic cylinder 13 is defeated
The hydraulic oil of outlet is intercepted by second one-way valve 17 or three two electric change valves 18, can not be back in fuel tank 1, and hydraulic
The output end of cylinder 13 is still oily in discharge pressure, so that the pressure of piston is gradually increased in hydraulic cylinder 13, to increase hydraulic
Pressure of 13 piston of cylinder to rock.
When carrying out the holding of rock confining pressure, under the premise of above-mentioned process, hydraulic pump 20 is stopped working,
Under the metering function of the second one-way valve 17 of 13 input terminal of hydraulic cylinder, so that pressure maintaining in hydraulic cylinder 13.
Due to each point on corresponding three axis of rock of each hydraulic cylinder 13, and hydraulic cylinder 13 of the invention be all it is in parallel,
So that each hydraulic cylinder 13 can be controlled individually, when carrying out the control of single hydraulic cylinder 13, as long as making other hydraulic
Three two electric change valves 18 on 13 output end of cylinder and input terminal are adjusted to left position and namely end position, so as to
To press to rock single-point, its scope of application is improved, and can test rock single-point specific aim.
When completing rock test, two-position four-way solenoid directional control valve 19 is adjusted to right position, left and right two three two
Electric change valve 18 is adjusted to right position respectively and can be back to hydraulic oil in fuel tank 1.
The present embodiment preferably further includes quick oil-filled pipeline 8, and the both ends of the quickly oil-filled pipeline 8 are separately connected hydraulic
The output end of pump 20 and the oil inlet of hydraulic cylinder 13, the quickly oil-filled pipeline 8 are equipped with shut-off valve 10, pass through quick oil filler pipe
Road 8 can add block hydraulic cylinder 13 oil-filled and Oil drain operation, substantially increase operating efficiency, while reduce the use of other elements,
It can protect other elements, it should be noted that two three two electric change valves 18 are when carrying out quickly oil-filled
Positioned at left position, to cut off the positive oil pipe road of hydraulic pump 20 Yu hydraulic cylinder 13.
The present embodiment is preferably equipped with accumulator 15 at the oil inlet of the hydraulic cylinder 13, buffers the pressure wave in oil circuit
It is dynamic, so that the confining pressure in triaxial chamber is more stable, while playing the role of protecting Hydraulic Elements.
The present embodiment is preferably equipped with pressure sensor 14 at the oil inlet of the hydraulic cylinder 13, for detecting hydraulic cylinder 13
Interior oil pressure can control hydraulic pump 20 and be pressurized to hydraulic insufficient single hydraulic cylinder 13 when oil pressure deficiency.
The present embodiment is preferably equipped with the pressure gauge 9 connecting with pressure sensor 14 at the oil inlet of the hydraulic cylinder 13,
Whether the pressure that can more intuitively detect hydraulic cylinder 13 is up to standard.
The output end of the preferred hydraulic pump 20 of the present embodiment is connected with third check valve 7, returns for limiting hydraulic oil
Stream.
Preferably the oil returning tube of the two-position four-way solenoid directional control valve 19 and fuel tank 1 is equipped with air-cooled oil to the present embodiment
Cooler 5 and oil filter 3, for the cooling and filtering of high temperature reflux hydraulic oil, to be recycled.
The present embodiment preferably further includes air compressor machine 12,12 connection liquid cylinder pressure 13 of air compressor machine, and the air compressor machine 12 connects
The pipeline for connecing hydraulic cylinder 13 is equipped with air cleaner 11, when carrying out oil circuit cleaning to system of the invention, as long as logical
It crosses after air compressor machine 12 purifies pressure-air by air cleaner 11 and is passed through in hydraulic cylinder 13, left and right at this time two three two
Electric change valve 18 is respectively positioned on right position, and two-position four-way solenoid directional control valve 19 is adjusted to right position, and shut-off valve 10 is opened so that pipeline
Interior hydraulic oil is driven fully into fuel tank 1 under the action of pressure-air, so that the hydraulic oil in pipeline be emptied.
The present embodiment is preferably connected with liquid level thermometer 4 on the fuel tank 1, for detecting the hydraulic oil temperature in fuel tank 1
Whether degree meets using standard.
The present embodiment is preferably equipped with overflow valve 6 between the fuel tank 1 and quick oil-filled pipeline 8, prevents oil circuit blocking, pressure
Power such as increases at the accidents suddenly causes hydraulic pump 20 to damage, to protect hydraulic pump 20.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine, including fuel tank, two-position four-way solenoid directional control valve
With several hydraulic cylinders in parallel being located in three axis direction of rock, the fuel tank is connected with oil filter, and oil filter is connected with liquid
Press pump, the hydraulic pump are connected with motor, it is characterized in that: the output end and fuel tank of the hydraulic pump are connected to two-position four-way electricity
The output end of magnetic reversal valve, two output ends of the two-position four-way solenoid directional control valve are separately connected there are two three two-way electromagnetism
Reversal valve, two output ends of three two electric change valves are connected separately with the first reversal valve and the second commutation in parallel
The current limliting of valve, first reversal valve and the second reversal valve is contrary, the first reversal valve and the second reversal valve described in two groups
Parallel outputs are separately connected the oil inlet and oil return opening of hydraulic cylinder.
2. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: further including fast
The oil-filled pipeline of speed, the both ends of the quickly oil-filled pipeline are separately connected the oil inlet of the output end and hydraulic cylinder of hydraulic pump, described
Quick oil-filled pipeline is equipped with shut-off valve.
3. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: described hydraulic
Accumulator is equipped at the oil inlet of cylinder.
4. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: described hydraulic
Pressure sensor is equipped at the oil inlet of cylinder.
5. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 4: described hydraulic
The pressure gauge connecting with pressure sensor is equipped at the oil inlet of cylinder.
6. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: described hydraulic
The output end of pump is connected with third check valve.
7. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: described two
The oil returning tube of four-way electromagnetic reversing valve and fuel tank is equipped with wind cooling oil cooler and oil filter.
8. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: further including sky
The pipeline of press, the air compressor machine connection liquid cylinder pressure, the air compressor machine connection liquid cylinder pressure is equipped with air cleaner.
9. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: the fuel tank
On be connected with liquid level thermometer.
10. a kind of hydraulic cylinder autonomous control system of rock triaxial creep testing machine according to claim 1: the fuel tank
Overflow valve is equipped between quick oil-filled pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910547055.7A CN110259743B (en) | 2019-06-24 | 2019-06-24 | Hydraulic cylinder independent control system of rock triaxial creep testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910547055.7A CN110259743B (en) | 2019-06-24 | 2019-06-24 | Hydraulic cylinder independent control system of rock triaxial creep testing machine |
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| Publication Number | Publication Date |
|---|---|
| CN110259743A true CN110259743A (en) | 2019-09-20 |
| CN110259743B CN110259743B (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910547055.7A Active CN110259743B (en) | 2019-06-24 | 2019-06-24 | Hydraulic cylinder independent control system of rock triaxial creep testing machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521493A (en) * | 2020-06-10 | 2020-08-11 | 太原理工大学 | High-temperature triaxial rock creep testing machine capable of simultaneously loading in multiple stages and using method |
| JP2020125848A (en) * | 2020-04-07 | 2020-08-20 | 株式会社クボタ | Hydraulic system of working machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400455A (en) * | 2002-09-19 | 2003-03-05 | 北京航空航天大学 | Hydraulic energy source equipment |
| CN101253335A (en) * | 2005-08-19 | 2008-08-27 | 布奇尔液压公司 | Circuit for controlling a double-action hydraulic drive cylinder |
| CN201779083U (en) * | 2010-08-25 | 2011-03-30 | 比亚迪股份有限公司 | Hydraulic control system |
| CN202145182U (en) * | 2011-07-05 | 2012-02-15 | 成都市伺服液压设备有限公司 | Novel hydraulic loading control system for triaxial creep test of rock |
| CN103846404A (en) * | 2012-11-30 | 2014-06-11 | 无锡市协新气动有限公司 | Throttle governing hydraulic system for sector pouring ladle |
-
2019
- 2019-06-24 CN CN201910547055.7A patent/CN110259743B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400455A (en) * | 2002-09-19 | 2003-03-05 | 北京航空航天大学 | Hydraulic energy source equipment |
| CN101253335A (en) * | 2005-08-19 | 2008-08-27 | 布奇尔液压公司 | Circuit for controlling a double-action hydraulic drive cylinder |
| CN201779083U (en) * | 2010-08-25 | 2011-03-30 | 比亚迪股份有限公司 | Hydraulic control system |
| CN202145182U (en) * | 2011-07-05 | 2012-02-15 | 成都市伺服液压设备有限公司 | Novel hydraulic loading control system for triaxial creep test of rock |
| CN103846404A (en) * | 2012-11-30 | 2014-06-11 | 无锡市协新气动有限公司 | Throttle governing hydraulic system for sector pouring ladle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020125848A (en) * | 2020-04-07 | 2020-08-20 | 株式会社クボタ | Hydraulic system of working machine |
| CN111521493A (en) * | 2020-06-10 | 2020-08-11 | 太原理工大学 | High-temperature triaxial rock creep testing machine capable of simultaneously loading in multiple stages and using method |
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| Publication number | Publication date |
|---|---|
| CN110259743B (en) | 2021-02-19 |
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