CN110259743B - Hydraulic cylinder independent control system of rock triaxial creep testing machine - Google Patents
Hydraulic cylinder independent control system of rock triaxial creep testing machine Download PDFInfo
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- CN110259743B CN110259743B CN201910547055.7A CN201910547055A CN110259743B CN 110259743 B CN110259743 B CN 110259743B CN 201910547055 A CN201910547055 A CN 201910547055A CN 110259743 B CN110259743 B CN 110259743B
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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
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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
- 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
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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
- 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
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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
- 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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- 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 hydraulic cylinder independent control system of a rock triaxial creep testing machine, which comprises an oil tank, a two-position four-way electromagnetic directional valve and a plurality of hydraulic cylinders which are positioned in parallel in the triaxial direction of rock, the oil tank is connected with an oil filter, the oil filter is connected with a hydraulic pump, the hydraulic pump is connected with a motor, the output end of the hydraulic pump and the oil tank are connected with the output end of the two-position four-way electromagnetic directional valve, the two output ends of the two-position four-way electromagnetic directional valve are respectively connected with two three-position two-way electromagnetic directional valves, two output ends of the three-position two-way electromagnetic directional valve are respectively connected with a first directional valve and a second directional valve which are connected in parallel, the hydraulic cylinder independent control system of the rock triaxial creep testing machine is wide in application range.
Description
Technical Field
The invention relates to the field of rock test equipment, in particular to a hydraulic cylinder independent control system of a rock triaxial creep testing machine.
Background
The triaxial creep test of the rock is an important means for measuring the long-term mechanical behavior of the rock, and the test time can be as long as months, and more than years. During creep testing, multiple differential stresses (axial pressure minus confining pressure) are typically involved, and the magnitude of each stress application must be kept strictly constant to ensure reliable test data. The existing rock creep testing machine mostly adopts hydraulic servo control to realize constant pressure, and the existing three-axis testing machine adopts integral control, namely, a single surface integrally presses the rock, single-point pressing can not be carried out on different rocks, or the pressing area is adjusted according to the size of the rock, so that the application range and the action range and pertinence of the rock creep testing machine are limited to a certain extent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the hydraulic cylinder independent control system of the rock triaxial creep testing machine with a good application range.
In order to achieve the purpose, the invention provides the following technical scheme: a hydraulic cylinder independent control system of a rock triaxial creep testing machine comprises an oil tank, a two-position four-way electromagnetic directional valve and a plurality of hydraulic cylinders which are positioned in parallel in the triaxial direction of a rock, wherein the oil tank is connected with an oil filter which is connected with a hydraulic pump, the hydraulic pump is connected with a motor, the output end of the hydraulic pump and the oil tank are connected with the input end of the two-position four-way electromagnetic directional valve, two output ends of the two-position four-way electromagnetic directional valve are respectively connected with two three-position two-way electromagnetic directional valves, two output ends of the three-position two-way electromagnetic directional valve are respectively connected with a first one-way valve and a second one-way valve which are connected in parallel, the flow limiting directions of the first one-way valve and the second one-way valve are opposite, the parallel output ends of two groups of the first one-way, the right position is the return oil level, the left position in the three-position two-way electromagnetic directional valve is the stop position, the middle position is communicated with the second one-way valve, and the right position is communicated with the first one-way valve.
The hydraulic cylinder is characterized by further comprising a quick oil charging pipeline, wherein two ends of the quick oil charging pipeline are respectively connected with the output end of the hydraulic pump and the oil inlet of the hydraulic cylinder, and a stop valve is arranged on the quick oil charging pipeline.
And an energy accumulator is arranged at an oil inlet of the hydraulic cylinder.
And a pressure sensor is arranged at an oil inlet of the hydraulic cylinder.
And a pressure gauge connected with a pressure sensor is arranged at an oil inlet of the hydraulic cylinder.
And the output end of the hydraulic pump is further connected with a third one-way valve.
And an air-cooled oil cooler and an oil filter are further arranged on an oil return pipeline of the two-position four-way electromagnetic reversing valve and the oil tank.
The air compressor is connected with the hydraulic cylinder, and an air filter is arranged on a pipeline of the air compressor connected with the hydraulic cylinder.
Further, a liquid level thermometer is connected to the oil tank.
An overflow valve is further arranged between the oil tank and the quick oil charging pipeline.
In summary, each hydraulic cylinder corresponds to each point on three axes of the rock, and the hydraulic cylinders are connected in parallel, so that each hydraulic cylinder can be controlled independently, and when a single hydraulic cylinder is controlled, only the three-position two-way electromagnetic directional valves on the output ends and the input ends of other hydraulic cylinders are adjusted to the left position, namely the stop position, so that the single-point pressure can be applied to the rock, the application range of the single-point pressure is improved, and the single-point pertinence test on the rock can be performed.
Drawings
FIG. 1 is an oil circuit diagram of a hydraulic cylinder independent control system of a rock triaxial creep testing machine.
Description of the labeling: 1. an oil tank; 2. an electric motor; 3. an oil filter; 4. a liquid level thermometer; 5. an air-cooled oil cooler; 6. an overflow valve; 7. a third check valve; 8. a fast oil charging pipeline; 9. a pressure gauge; 10. a stop valve; 11. an air cleaner; 12. an air compressor; 13. a hydraulic cylinder; 14. a pressure sensor; 15. an accumulator; 16. a first check valve; 17. a second one-way valve; 18. a three-position two-way electromagnetic directional valve; 19. a two-position four-way electromagnetic directional valve; 20. a hydraulic pump.
Detailed Description
An embodiment of the independent control system of the hydraulic cylinder of the rock triaxial creep testing machine according to the present invention is further described with reference to fig. 1.
An independent control system for a hydraulic cylinder 13 of a rock triaxial creep testing machine comprises an oil tank 1, a two-position four-way electromagnetic directional valve 19 and a plurality of hydraulic cylinders 13 which are positioned in parallel in the triaxial direction of a rock, an oil filter 3 is connected to the oil tank 1, a hydraulic pump 20 is connected to the oil filter 3, an electric motor 2 is connected to the hydraulic pump 20, the output end of the hydraulic pump 20 and the oil tank 1 are connected with the input end of a two-position four-way electromagnetic directional valve 19, two output ends of the two-position four-way electromagnetic directional valve 19 are respectively connected with two three-position two-way electromagnetic directional valves 18, two output ends of the three-position two-way electromagnetic directional valve 18 are respectively connected with a first one-way valve 16 and a second one-way valve 17 which are connected in parallel, the flow limiting directions of the first one-way valve 16 and the second one-way valve 17 are opposite, and the parallel output ends of the two groups of the first one-way valve 16 and the second one-way valve 17 are respectively connected with an oil inlet and an oil return port of the hydraulic cylinder 13.
As shown in fig. 1, the left position of the two-position four-way electromagnetic directional valve 19 is an oil inlet position, the right position is an oil return position, the left position of the three-position two-way electromagnetic directional valve 18 is a stop position, the middle position is communicated with the second one-way valve 17, the right position is communicated with the first one-way valve 16, when the piston rod of the hydraulic cylinder 13 moves to contact with the rock to be measured, the hydraulic cylinder 13 is communicated with the left position of the two-position four-way electromagnetic directional valve 19, so that the pressure reaches the input end of the three-position two-way electromagnetic directional valve 18, in the embodiment, the three-position two-way electromagnetic directional valve 18 communicated with the output end of the hydraulic cylinder 13 is arranged at the right position and communicated with the first one-way valve 16, the three-position two-way electromagnetic directional valve 18 communicated with the input end of the hydraulic cylinder 13 is arranged at the middle position and communicated with the second one-way valve 17, the pressure oil enters the hydraulic cylinder 13 through the second one-way, and the rock flows back to the oil tank 1 through the two-position four-way electromagnetic directional valve 19, so that the position of the piston rod of each hydraulic cylinder 13 is sequentially adjusted, and the rock is extruded by the hydraulic cylinders 13 in the three-axis direction.
When the position of the piston of the hydraulic cylinder 13 is adjusted, pressure is applied to the rock in the three-axis direction, at the moment, only the three-position two-way electromagnetic directional valve 18, connected with the output end, of the hydraulic cylinder 13 needs to be adjusted to the left position or the middle position, so that hydraulic oil at the output end of the hydraulic cylinder 13 is intercepted by the second one-way valve 17 or the three-position two-way electromagnetic directional valve 18 and cannot flow back to the oil tank 1, the output end of the hydraulic cylinder 13 still conveys pressure oil, the pressure to the piston in the hydraulic cylinder 13 is gradually increased, and the pressure of the piston of the hydraulic cylinder 13 to the.
When rock confining pressure is kept, the hydraulic pump 20 is stopped under the premise of the above process, and pressure is kept in the hydraulic cylinder 13 under the flow limiting effect of the second check valve 17 at the input end of the hydraulic cylinder 13.
Because each hydraulic cylinder 13 corresponds to each point on three axes of the rock, and the hydraulic cylinders 13 are connected in parallel, each hydraulic cylinder 13 can be controlled independently, when the single hydraulic cylinder 13 is controlled, only the three-position two-way electromagnetic directional valves 18 on the output ends and the input ends of other hydraulic cylinders 13 are adjusted to the left position, namely the stop position, so that the single-point pressure on the rock can be applied, the application range of the single-point pressure on the rock is improved, and the single-point pertinence test on the rock can be performed.
When the rock test is finished, the two-position four-way electromagnetic directional valve 19 is adjusted to the right position, and the two three-position two-way electromagnetic directional valves 18 on the left and the right are respectively adjusted to the right position, so that the hydraulic oil can flow back into the oil tank 1.
The preferred still includes quick oil charging pipeline 8 of this embodiment, the both ends of quick oil charging pipeline 8 are connected the output of hydraulic pump 20 and the oil inlet of pneumatic cylinder 13 respectively, be equipped with stop valve 10 on quick oil charging pipeline 8, can add the piece pneumatic cylinder 13 oil charge and oil discharge operation through quick oil charging pipeline 8, have improved operating efficiency greatly, reduce the use of other components simultaneously, can protect other components, it needs to explain that two three-position two-way electromagnetic directional control valves 18 are all located the left position when carrying out quick oil charging to cut off the hydraulic pump 20 and the forward oil piping way of pneumatic cylinder 13. .
In the preferred embodiment, an accumulator 15 is arranged at an oil inlet of the hydraulic cylinder 13 to buffer pressure fluctuation in an oil path, so that confining pressure in the triaxial chamber is more stable, and a function of protecting hydraulic elements is achieved.
In the preferred embodiment, a pressure sensor 14 is disposed at an oil inlet of the hydraulic cylinder 13 and used for detecting the oil pressure in the hydraulic cylinder 13, and when the oil pressure is insufficient, the hydraulic pump 20 can be controlled to pressurize the hydraulic cylinder 13 with insufficient oil pressure.
The oil inlet of the hydraulic cylinder 13 is provided with the pressure gauge 9 connected with the pressure sensor 14, so that whether the pressure of the hydraulic cylinder 13 reaches the standard can be detected more intuitively.
The output end of the hydraulic pump 20 in this embodiment is preferably connected to a third check valve 7 for limiting the backflow of the hydraulic oil.
In the preferred embodiment, the two-position four-way electromagnetic directional valve 19 and the oil return pipeline of the oil tank 1 are provided with an air-cooled oil cooler 5 and an oil filter 3, which are used for cooling and filtering high-temperature return hydraulic oil so as to be recycled.
The system of the invention is characterized by further comprising an air compressor 12, the air compressor 12 is connected with a hydraulic cylinder 13, an air filter 11 is arranged on a pipeline of the air compressor 12 connected with the hydraulic cylinder 13, when the oil path of the system is cleaned, high-pressure air is purified by the air filter 11 through the air compressor 12 and then introduced into the hydraulic cylinder 13, the left three-position two-way electromagnetic directional valve 18 and the right three-position two-way electromagnetic directional valve 19 are both located at the right position, the two-position four-way electromagnetic directional valve 19 is adjusted to the right position, and the stop valve 10 is opened to enable hydraulic oil in the pipeline to be completely pushed into the oil tank 1 under the action of the high-pressure air.
In the present embodiment, a liquid level thermometer 4 is preferably connected to the oil tank 1, and is used for detecting whether the temperature of the hydraulic oil in the oil tank 1 meets a use standard.
An overflow valve 6 is preferably arranged between the oil tank 1 and the quick oil charging pipeline 8 in this embodiment, so as to prevent the hydraulic pump 20 from being damaged due to accidents such as oil path blockage and sudden pressure rise, and protect the hydraulic pump 20.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The utility model provides a rock triaxial creep test machine's pneumatic cylinder independent control system, includes oil tank, two-position four-way solenoid directional valve and is located the parallelly connected pneumatic cylinder of a plurality of rock triaxial direction, the oil tank is connected with the oil filter, and the oil filter is connected with the hydraulic pump, the hydraulic pump is connected with motor, characterized by: the output end and the oil tank of the hydraulic pump are connected to the input end of a two-position four-way electromagnetic directional valve, two output ends of the two-position four-way electromagnetic directional valve are respectively connected with two three-position two-way electromagnetic directional valves, two output ends of the three-position two-way electromagnetic directional valve are respectively connected with a first one-way valve and a second one-way valve which are connected in parallel, the flow limiting directions of the first one-way valve and the second one-way valve are opposite, the two output ends of the first one-way valve and the second one-way valve which are connected in parallel are respectively connected with an oil inlet and an oil return port of a hydraulic cylinder, the left position of the two-position four-way electromagnetic directional valve is an oil inlet level, the right position of the two-position four-way electromagnetic directional valve is an oil.
2. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: the hydraulic pump is characterized by further comprising a quick oil charging pipeline, wherein two ends of the quick oil charging pipeline are respectively connected with the output end of the hydraulic pump and the oil inlet of the hydraulic cylinder, and a stop valve is arranged on the quick oil charging pipeline.
3. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: and an energy accumulator is arranged at an oil inlet of the hydraulic cylinder.
4. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: and a pressure sensor is arranged at an oil inlet of the hydraulic cylinder.
5. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 4: and a pressure gauge connected with a pressure sensor is arranged at an oil inlet of the hydraulic cylinder.
6. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: and the output end of the hydraulic pump is connected with a third one-way valve.
7. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: and an air-cooled oil cooler and an oil filter are arranged on an oil return pipeline of the two-position four-way electromagnetic reversing valve and the oil tank.
8. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: the air compressor is connected with the hydraulic cylinder, and an air filter is arranged on a pipeline of the air compressor connected with the hydraulic cylinder.
9. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: and the oil tank is connected with a liquid level thermometer.
10. The hydraulic cylinder independent control system of the rock triaxial creep testing machine of claim 1: and an overflow valve is arranged between the oil tank and the quick oil charging 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 |
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| 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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| CN110259743A CN110259743A (en) | 2019-09-20 |
| CN110259743B true CN110259743B (en) | 2021-02-19 |
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| JP6855618B2 (en) * | 2020-04-07 | 2021-04-07 | 株式会社クボタ | Work machine hydraulic system |
| CN111521493B (en) * | 2020-06-10 | 2022-08-16 | 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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| CN1180233C (en) * | 2002-09-19 | 2004-12-15 | 北京航空航天大学 | Hydraulic energy source equipment |
| EP1915538B1 (en) * | 2005-08-19 | 2012-04-04 | Bucher Hydraulics AG | 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 |
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