CN109632232B - Upright post valve unloading impact test device - Google Patents
Upright post valve unloading impact test device Download PDFInfo
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- CN109632232B CN109632232B CN201910014739.0A CN201910014739A CN109632232B CN 109632232 B CN109632232 B CN 109632232B CN 201910014739 A CN201910014739 A CN 201910014739A CN 109632232 B CN109632232 B CN 109632232B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The invention relates to a column valve unloading impact test device, wherein a column is arranged in a column frame, a column piston rod is arranged in the column in a sliding manner, and a piston cavity is formed between the bottom of the column piston rod and the bottom of the column; the top of the upright post piston rod is connected with the end part of the impact cylinder piston rod, the impact cylinder piston rod is arranged in the impact cylinder, the impact cylinder is arranged at the top of the upright post frame, and the impact cylinder piston rod is connected with the top wall of the upright post frame in a sliding manner; an energy storage mechanism is arranged outside the impact cylinder; the piston cavity at the bottom of the upright column is connected with one end of an upright column one-way valve arranged outside the upright column framework through a pipeline, and the other end of the upright column one-way valve is connected with a high-pressure liquid storage pool provided with an emulsion pump source through a hydraulic control mechanism. The device has the characteristics of controllable energy release gradient, controllable energy duration and the like, and is suitable for unloading impact dynamic performance tests of the column hydraulic control one-way valves with different structural types.
Description
Technical Field
The invention relates to the field of unloading impact performance testing of a hydraulic control one-way valve, in particular to an unloading impact testing device of a stand column valve.
Background
Due to special and complex geological conditions, a plurality of uncertain safety factors are brought to a coal face, such as vertical external force, horizontal external force and lateral force, and the support generates large deformation, so that the compression of liquid is eliminated during the unloading of the upright column, the deformation of the support and a top plate (particularly the deformation of the support) is eliminated, a large amount of high-pressure liquid needs to be discharged, and the explosive energy release of the large amount of high-pressure liquid in a very short time through a one-way valve inevitably causes severe impact and vibration of the system.
According to the test method of unloading impact of the hydraulic control check valve in national standards GB25974.3 and EN1804.3, an upright post with the cylinder diameter phi 280 is placed in a rigid frame and loaded to nominal pressure, then liquid is supplied to a control port of the check valve and an upper cavity of the upright post, liquid in a high-pressure cavity is unloaded, and the unloading process is accompanied with pressure fluctuation. The test system model is rigid, the frame for fixing the upright post is not deformed basically, the liquid amount required by the pressurization of the upright post is equal to the compression amount of liquid in the lower cavity of the upright post, and the absorbed energy is small. When unloading, only liquid which generates a compression amount is released, the pressure of the lower cavity of the upright column is eliminated, the check valve enters a low-pressure working state in the subsequent column descending action, statistical analysis is carried out on the unqualified rate of the unloading impact item of a model test, the phenomenon of disqualification is rarely found, and only foreign check valve products have higher impact pressure which is less than 115% of nominal pressure. After 5000 times of endurance type tests, the one-way valves of the same batch are actually used for hundreds of times under the coal mine, and the key reason is that the test environment in the standard has a certain difference from the actual working condition; through the comparison of the unloading impact pressure curve in the laboratory and the underground coal mine, huge energy exists at the unloading initial stage of the hydraulic support under the actual working condition, so that the hydraulic system vibrates violently, and the service life of hydraulic elements such as a one-way valve and a safety valve is directly influenced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a pillar valve unloading impact test apparatus, which realizes the test of the unloading impact pressure performance of a check valve under different energy release gradient conditions through an energy storage impact mechanism, a flow rate regulating mechanism and a throttling device, and provides data support for the manufacturing and revision of the standard of the check valve in the coal mine industry.
In order to achieve the purpose, the invention adopts the following technical scheme: an unloading impact test device for a stand column valve comprises a stand column frame, a stand column piston rod, an impact cylinder, a stand column one-way valve, a hydraulic control mechanism and an energy storage mechanism; the upright post is arranged in the upright post frame, the upright post piston rod is arranged in the upright post in a sliding manner, and a piston cavity is formed between the bottom of the upright post piston rod and the bottom of the upright post; the top of the upright post piston rod is connected with the end part of the impact cylinder piston rod, the impact cylinder piston rod is arranged in the impact cylinder, the impact cylinder is arranged at the top of the upright post frame, and the impact cylinder piston rod is connected with the top wall of the upright post frame in a sliding manner; the energy storage mechanism is arranged outside the impact cylinder; and a piston cavity at the bottom of the upright column is connected with one end of an upright column one-way valve arranged outside the upright column frame through a pipeline, and the other end of the upright column one-way valve is connected with a high-pressure liquid storage tank provided with an emulsion pump source through the hydraulic control mechanism.
Furthermore, one side of the bottom of the upright post is provided with a liquid inlet which is connected with the upright post one-way valve.
Further, the energy storage mechanism comprises a flow speed regulation control mechanism and an energy accumulator; the flow rate speed regulation control mechanism is connected with the energy accumulator, and the flow rate speed regulation control mechanism regulates the energy release gradient of the energy accumulator; the flow speed regulation control mechanisms are symmetrically arranged on the outer side of the cylinder wall of the impact cylinder.
Further, the energy accumulator is arranged on the foundation.
Further, the hydraulic control mechanism comprises a throttling device and an electromagnetic reversing valve; the liquid outlet of the upright post one-way valve is connected with one end of the throttling device, the other end of the throttling device is connected with the electromagnetic directional valve, and the electromagnetic directional valve is connected with a high-pressure liquid storage tank with an emulsion pump source.
Further, the throttling device comprises a throttling valve and a one-way valve; the throttling valve is connected with one end of the one-way valve, and the other end of the one-way valve is connected with the stand column one-way valve and the electromagnetic directional valve.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention solves the problems of short energy release time and less sustained release energy in the unloading impact performance test of the hydraulic support upright post hydraulic control one-way valve. 2. The invention adds an impact cylinder, applies pressure to the upright post piston rod through an energy storage impact mechanism, a flow speed regulating mechanism and a throttling device, and simulates the influence of the pressure of a support top plate and the deformation of a support on the impact pressure of the one-way valves with different flows and different pressures when the support one-way valve is unloaded. The unloading impact dynamic characteristic requirements of the hydraulic control one-way valve with different flow rates and different pressures under different support deformation energy storage release working conditions can be met. In conclusion, the device is suitable for the unloading impact dynamic performance test of the upright hydraulic control one-way valve with different structural types.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
In the description of the present invention, it is to be understood that the terms "top," "bottom," "inner," "outer," and the like refer to orientations and positional relationships based on those shown in the drawings, and are used for convenience in describing and simplifying the present invention, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. The invention is described in detail below with reference to the figures and examples.
As shown in FIG. 1, the invention provides a pillar valve unloading impact test device, which has controllable energy release gradient and controllable energy release duration. The invention comprises a vertical column frame 1, a vertical column 2, a vertical column piston rod 3, an impact cylinder piston rod 4, an impact cylinder 5, a vertical column one-way valve 6, a hydraulic control mechanism and an energy storage mechanism.
The stand frame 1 is used for simulating a coal seam roof, and is provided with a stand 2 in the stand frame 1, a stand piston rod 3 is arranged in the stand 2 in a sliding mode, and a piston cavity is formed between the bottom of the stand piston rod 3 and the bottom of the stand 2. The top of the upright post piston rod 3 is connected with the end of the impact cylinder piston rod 4 so as to simulate the influence of the top plate pressure and the support deformation on the one-way valve when the one-way valve unloads impact; the impact cylinder piston rod 4 is arranged in the impact cylinder 5, the impact cylinder 5 is arranged at the top of the upright post frame 1, the impact cylinder piston rod 4 is connected with the top wall of the upright post frame 1 in a sliding mode, and the impact cylinder 5, the top wall of the upright post frame 1 and the impact cylinder piston rod 4 form a piston structure. An energy accumulating mechanism is arranged outside the impact cylinder 5. One side of a piston cavity at the bottom of the upright column 2 is provided with a liquid inlet 21, the liquid inlet 21 is connected with one end of an upright column one-way valve 6 arranged outside the upright column frame 1 through a pipeline, and the other end of the upright column one-way valve 6 is connected with a high-pressure liquid storage pool provided with an emulsion pump source through a hydraulic control mechanism.
When the device is used, high-pressure liquid generated by an emulsion pump enters the piston cavity of the upright post 2 through the hydraulic control mechanism and the liquid inlet 21, so that the upright post piston rod 3 moves upwards, the impact cylinder piston rod 4 is further pushed to move upwards, and energy is stored for the energy storage mechanism after the nominal pressure of the upright post check valve 6 is reached. Adjusting the opening amount of the hydraulic control mechanism and the opening amount of the energy storage mechanism in real time according to the predetermined energy release gradient; after the energy storage mechanism is started, when an unloading impact performance test is carried out, according to the determined energy release gradient and the energy sustained release time, the energy stored by the energy storage mechanism acts on a piston cavity of the impact cylinder 5, and then the release of the deformation of a support top beam and a top plate is simulated; the impact cylinder piston rod 4 pushes the upright post piston rod 3 to move downwards, and the released energy acts on the upright post piston rod 3 through the impact cylinder piston rod 4 to simulate the downward deformation energy of the coal seam roof and the support top beam; and (3) supplying liquid to a control cavity of the upright column one-way valve 6, opening the upright column one-way valve 6, enabling a large amount of high-pressure liquid to continuously pass through the upright column one-way valve 6, stopping energy release after the energy is released, enabling the upright column one-way valve 6 to enter a slow release stage, testing the pressure change characteristics in the unloading process, completing an impact test, and recording and analyzing the change rule of the impact pressure and the change rule of the energy release gradient of the upright column one-way valve 6 in the whole unloading process by using the conventional testing system.
In the above embodiment, the energy storage mechanism includes the flow rate control mechanism 7 and the energy storage device 8. The flow rate speed regulation control mechanism 7 is connected with the energy accumulator 8, and the flow rate speed regulation control mechanism 7 regulates the energy release gradient of the energy accumulator 8; and the flow speed regulating control mechanisms 7 are symmetrically arranged on the outer side of the cylinder wall of the impact cylinder 5 so as to ensure that the piston rod 4 of the impact cylinder is stressed uniformly in the sliding process. Wherein, energy storage ware 8 is placed on the ground for experimental provision power supply, the energy storage of simulation support deformation.
In the above embodiments, the pilot control mechanism includes the throttling device 9 and the electromagnetic directional valve 10. The liquid outlet of the column one-way valve 6 is connected with one end of a throttling device 9, the other end of the throttling device 9 is connected with an electromagnetic directional valve 10, and the electromagnetic directional valve 10 is connected with a high-pressure liquid storage pool with an emulsion pump source.
In a preferred embodiment, the throttle device 9 is used for fine adjustment of the energy release gradient and comprises a throttle valve 91 and a non-return valve 92. The throttle valve 91 is connected with one end of a check valve 92, and the other end of the check valve 92 is connected with the column check valve 6 and the electromagnetic directional valve 10.
When the device is used, after the upright post one-way valve 6 reaches the nominal pressure, the volume, the inflation pressure and the liquid filling pressure of the energy accumulator 8 are adjusted according to the determined energy release gradient, the opening amounts of the flow speed regulating mechanism 6 and the throttling device 9 are adjusted in real time, so that the unloading gradient of the upright post one-way valve 6 is controlled, and the support deformation release speed during unloading of the coal mine underground one-way valve is simulated.
In conclusion, the practical working condition of the underground coal mine hydraulic support during unloading can be analyzed according to the unloading impact tests of GB25974.3 and EN1804 check valves, the difference between the practical working condition and the laboratory test environment is found, a large number of unloading impact tests are carried out on different supports with the same working resistance aiming at hydraulic control check valves with different flow rates and different pressures, and the release rule of support deformation, the change rule of unloading impact pressure and the corresponding relation between the release rule and the change rule are found.
According to the invention, the impact cylinder 5 is additionally arranged to apply pressure to the upright post piston rod 3, so that the influence of the pressure of a support top plate and the deformation of a support on the impact pressure of the one-way valve is simulated when the support one-way valve is unloaded; the unloading gradient of the upright post one-way valve 6 is controlled by comprehensively adjusting the opening amount of the outlet of the energy accumulator 8 and the opening amount of the throttling device 9 at the liquid outlet of the upright post one-way valve 6, so that the support deformation release speed during unloading of the coal mine underground one-way valve is simulated; in addition, different practical working conditions during unloading of the hydraulic support are simulated through various combination modes of different accumulator volumes, different accumulator inflation pressures and different charging pressures, and the test requirements of the upright column one-way valve 6 with different flow rates and different pressures can be met.
The unloading gradient of the upright post one-way valve 6 is controlled by comprehensively adjusting the flow speed regulation control mechanism 7 and the throttling device 9, namely the opening of the energy accumulator 8 and the opening of the throttling device 9 at the liquid outlet of the upright post one-way valve 6, so that the support deformation release speed during unloading of the coal mine underground one-way valve is simulated.
According to the invention, by adding the impact cylinder 5, when the unloading impact of the upright post one-way valve 6 is simulated, the influence of the pressure of the top plate and the deformation of the bracket on the upright post one-way valve 6 can be obtained.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (3)
1. The utility model provides a stand valve uninstallation impact test device which characterized in that: the device comprises a stand column frame, a stand column piston rod, an impact cylinder, a stand column one-way valve, a hydraulic control mechanism and an energy storage mechanism;
the upright post is arranged in the upright post frame, the upright post piston rod is arranged in the upright post in a sliding manner, and a piston cavity is formed between the bottom of the upright post piston rod and the bottom of the upright post; the top of the upright post piston rod is connected with the end part of the impact cylinder piston rod, the impact cylinder piston rod is arranged in the impact cylinder, the impact cylinder is arranged at the top of the upright post frame, and the impact cylinder piston rod is connected with the top wall of the upright post frame in a sliding manner; the energy storage mechanism is arranged outside the impact cylinder; a piston cavity at the bottom of the upright column is connected with one end of an upright column one-way valve arranged outside the upright column framework through a pipeline, and the other end of the upright column one-way valve is connected with a high-pressure liquid storage tank provided with an emulsion pump source through the hydraulic control mechanism;
the energy storage mechanism comprises a flow speed regulation control mechanism and an energy accumulator; the flow rate speed regulation control mechanism is connected with the energy accumulator, and the flow rate speed regulation control mechanism regulates the energy release gradient of the energy accumulator; the flow speed regulation control mechanisms are symmetrically arranged on the outer side of the cylinder wall of the impact cylinder;
the hydraulic control mechanism comprises a throttling device and an electromagnetic reversing valve; the liquid outlet of the upright post one-way valve is connected with one end of the throttling device, the other end of the throttling device is connected with the electromagnetic directional valve, and the electromagnetic directional valve is connected with a high-pressure liquid storage pool with an emulsion pump source;
the throttling device comprises a throttling valve and a one-way valve; the throttling valve is connected with one end of the one-way valve, and the other end of the one-way valve is connected with the stand column one-way valve and the electromagnetic directional valve.
2. The test device of claim 1, wherein: one side of the bottom of the upright post is provided with a liquid inlet which is connected with the upright post one-way valve.
3. The test device of claim 1, wherein: the energy accumulator is arranged on the foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910014739.0A CN109632232B (en) | 2019-01-08 | 2019-01-08 | Upright post valve unloading impact test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910014739.0A CN109632232B (en) | 2019-01-08 | 2019-01-08 | Upright post valve unloading impact test device |
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| CN109632232A CN109632232A (en) | 2019-04-16 |
| CN109632232B true CN109632232B (en) | 2020-12-29 |
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| CN201910014739.0A Active CN109632232B (en) | 2019-01-08 | 2019-01-08 | Upright post valve unloading impact test device |
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| CN110641852B (en) * | 2019-08-19 | 2021-05-25 | 煤炭科学技术研究院有限公司 | Device and method for preventing test liquid with ultra-large flow from splashing and recovering test liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL146731B1 (en) * | 1985-01-17 | 1989-03-31 | Ct Kt Maszyn Gorniczych Komag | Roof support dynamic load generator |
| CN2083741U (en) * | 1990-01-20 | 1991-08-28 | 山西矿业学院 | Dynamic property tester for hydraulic support safety valve |
| CN101285391B (en) * | 2008-03-28 | 2011-06-01 | 北京天地玛珂电液控制系统有限公司 | Vertical column and its inner pressurization hydraulic support setting load hoisting system |
| CN102072219B (en) * | 2009-11-19 | 2014-01-01 | 煤炭科学研究总院 | Quickly loading booster cylinder and high-flow safety valve test device using same |
| CN203769811U (en) * | 2014-03-26 | 2014-08-13 | 安徽理工大学 | Self-help supercharging system with hydraulic supercharger and upright columns for hydraulic support |
| CN108333064A (en) * | 2017-01-20 | 2018-07-27 | 辽宁工程技术大学 | A kind of rock ultra-low friction hydraulic loading test device |
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