CN116793821B - Pulse test bed - Google Patents
Pulse test bed Download PDFInfo
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- CN116793821B CN116793821B CN202311034833.5A CN202311034833A CN116793821B CN 116793821 B CN116793821 B CN 116793821B CN 202311034833 A CN202311034833 A CN 202311034833A CN 116793821 B CN116793821 B CN 116793821B
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- 238000012360 testing method Methods 0.000 title claims abstract description 119
- 238000004146 energy storage Methods 0.000 claims abstract description 56
- 239000003921 oil Substances 0.000 claims description 214
- 230000001502 supplementing effect Effects 0.000 claims description 58
- 238000006073 displacement reaction Methods 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 29
- 239000010720 hydraulic oil Substances 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 239000000498 cooling water Substances 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 238000009661 fatigue test Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 7
- 230000003993 interaction Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of pulse test equipment, and discloses a pulse test bed, which increases the contact area between pressure oil and a pressure piston which are fed into an energy-saving pressurizing cavity by arranging more than one energy-saving pressurizing cavity, can reduce the pressure of the pressure oil which is fed into the energy-saving pressurizing cavity under the same pressure, reduces the energy consumption, can save energy by about 50 percent under the same working condition by arranging an energy storage unit, and greatly improves the energy utilization rate; the first oil cavity and the second oil cavity are arranged between the test cavity and the second energy-saving pressurizing cavity, so that the pressure difference at two sides of the pressure piston is reduced by using the first energy-saving pressurizing cavity and the second energy-saving pressurizing cavity, and the service life of the closed pump is prolonged.
Description
Technical Field
The invention relates to the technical field of pulse test equipment, in particular to a pulse test bed.
Background
The pulse test bed is mainly used for carrying out fatigue test on the gas storage tank so as to improve gas safety. Particularly, as the capacity of the hydrogen storage tank is larger and larger, the test period of the hydrogen storage tank is also prolonged gradually, and even more than one month can be reached. The long-time fatigue test of a single workpiece can not only increase energy consumption, but also lower energy utilization rate.
In addition, the booster and the main pump in the pulse test bed form a closed loop, and the single side of the booster is pressed, so that the load on two sides of the main pump is unbalanced, and the service life of the main pump is reduced.
Therefore, a pulse test stand is needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a pulse test bed which can reduce the energy consumption of a single workpiece during long-time test and improve the energy utilization rate; the load on two sides of the main pump can be balanced, and the service life of the main pump is prolonged.
To achieve the purpose, the invention adopts the following technical scheme:
a pulse test stand, comprising:
the pressure generator comprises a pressure cylinder body and a pressure piston, a first piston cavity and at least one second piston cavity are arranged in the inner cavity of the pressure cylinder body, two ends of the pressure piston are respectively arranged in the first piston cavity and the second piston cavity in a sliding mode, the first piston cavity is divided into a testing cavity, a first oil cavity, a second oil cavity and a first energy-saving pressurizing cavity which are distributed along the axial direction of the pressure piston in sequence and are not communicated with each other, each second piston cavity is divided into a pressure relief cavity and a second energy-saving pressurizing cavity, the testing cavity is connected with an inlet and an outlet of a test piece to be tested, and the pressure relief cavity is positioned between the first energy-saving pressurizing cavity and the second energy-saving pressurizing cavity and is communicated with the outside atmosphere;
the main pump assembly comprises a closed pump, and two oil ports of the closed pump are respectively communicated with the first oil cavity and the second oil cavity;
the energy-saving assembly comprises an energy-saving pump and an energy storage unit, wherein an outlet of the energy-saving pump is communicated with the first energy-saving pressurizing cavity and the second energy-saving pressurizing cavity through a first energy-saving oil circuit, and the outlet of the energy-saving pump is connected with the energy storage unit through a second energy-saving oil circuit.
As a preferable embodiment of the pulse test stand, the energy storage unit includes:
the energy storage cylinder comprises an energy storage cylinder body and an energy storage piston, and the energy storage piston is arranged in the energy storage cylinder body in a sliding manner and divides the inner cavity of the energy storage cylinder body into an energy storage oil cavity and an energy storage air cavity;
the energy-saving energy accumulator is communicated with the energy storage air cavity.
As a preferable technical scheme of the pulse test stand, the pulse test stand further comprises a pressure sensor and a position sensor, wherein the pressure sensor is used for detecting the pressure of an inlet and an outlet of the test piece to be tested, and the position sensor is used for detecting the displacement of the pressure piston;
the closed pump comprises a swing angle sensor and an LVDT, the main pump assembly further comprises a pilot pump and a displacement control valve, the pilot pump controls a swash plate of the closed pump to rotate through the displacement control valve, and the displacement control valve is a servo valve or a proportional valve;
the first energy-saving oil way is provided with a first energy-saving stop valve, and the first energy-saving stop valve is used for controlling the on-off of the first energy-saving oil way.
As a preferable technical scheme of the pulse test stand, a first accumulator is connected to a communication oil path between the pilot pump and the displacement control valve.
As a preferable technical scheme of the pulse test stand, an outlet of the energy-saving pump is connected with a first energy-saving overflow valve, and the pressure of the first energy-saving overflow valve is adjustable.
As a preferable technical scheme of the pulse test bed, one oil port of the closed pump is connected with the first oil cavity through a first oil way, and the other oil port of the closed pump is connected with the second oil cavity through a second oil way;
the pulse test bed further comprises an oil supplementing assembly, the oil supplementing assembly comprises a first oil supplementing pump and a second oil supplementing pump, the first oil supplementing pump is in one-way conduction with the first oil way through a first oil supplementing one-way valve, the first oil supplementing pump is in one-way conduction with the second oil way through a second oil supplementing one-way valve, and the second oil supplementing pump is in one-way conduction with the first energy-saving oil way and the second energy-saving oil way through a third oil supplementing one-way valve.
As a preferable technical solution of the pulse test stand, the pulse test stand further includes a safety valve, wherein the safety valve can selectively connect any one of the first oil path and the second oil path with the hydraulic oil tank through a main relief valve or disconnect both the first oil path and the second oil path from the main relief valve;
the safety valve is a hydraulic control valve, and the first oil way and the second oil way are respectively connected to two pilot ends of the safety valve.
As a preferred technical solution of the pulse test stand, the pulse test stand further includes a cooling assembly, and the cooling assembly includes:
the inlet of the cooling pump is connected with the hydraulic oil tank;
the heat exchanger is provided with a cooling oil duct and a cooling water channel, an outlet of the cooling pump is connected with the hydraulic oil tank through the cooling oil duct, and the cooling water channel is used for circulating cooling water.
As a preferable technical scheme of the pulse test bed, the first energy-saving pressurizing cavity and the second energy-saving pressurizing cavity are connected with a hydraulic oil tank through a pressurizing stop valve, and the test cavity is connected with a test medium tank through a test stop valve;
the pulse test bed further comprises a pre-filling and fluid-supplementing pump, an outlet of the pre-filling and fluid-supplementing pump is connected with a first pre-filling and fluid-supplementing stop valve, an outlet of the first pre-filling and fluid-supplementing stop valve is connected with an inlet and an outlet of the test piece to be tested and the test cavity, and a second pre-filling and fluid-supplementing stop valve is arranged on a connecting pipeline of the outlet of the first pre-filling and fluid-supplementing stop valve and the test cavity.
As a preferable technical scheme of the pulse test stand, the test stop valve, the first pre-filling and fluid-supplementing stop valve and the second pre-filling and fluid-supplementing stop valve are all pneumatic control valves;
the pulse test bench further comprises an air driving assembly, the air driving assembly comprises an air source, an air driving main pipe and air driving branch pipes, the air source is connected to the three air driving branch pipes respectively through the air driving main pipe, the three air driving branch pipes are connected to the three air control valves respectively, and each air driving branch pipe is provided with a driving control valve.
The invention has the beneficial effects that: according to the pulse test stand provided by the invention, more than one energy-saving pressurizing cavity is arranged, so that the contact area between the pressure oil fed into the energy-saving pressurizing cavity and the pressure piston is increased, the pressure of the pressure oil fed into the energy-saving pressurizing cavity can be reduced under the same pressure, the energy consumption is reduced, the energy can be saved by about 50% under the same working condition by arranging the energy storage unit, and the energy utilization rate is greatly improved; the first oil cavity and the second oil cavity are arranged between the test cavity and the second energy-saving pressurizing cavity, so that the pressure difference at two sides of the pressure piston is reduced by utilizing the first energy-saving pressurizing cavity and the second energy-saving pressurizing cavity, the service life of the closed pump is prolonged, and the closed pump is particularly suitable for fatigue tests of large-volume test pieces to be tested.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of the composition of a pulse test stand provided by an embodiment of the present invention;
FIG. 2 is a hydraulic schematic diagram of a pulse test stand provided by an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a pressure generator provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of inner loop control and outer loop control according to an embodiment of the present invention.
In the figure:
1. a pressure generator; 11. a pressure cylinder; 12. a pressure piston; 131. a test chamber; 132. a second energy-saving pressurizing cavity; 133. a pressure relief cavity; 134. a first energy-saving pressurizing cavity; 135. a first oil chamber; 136. a second oil chamber;
21. a closed pump; 22. a displacement control valve; 23. a pilot pump; 24. a first accumulator;
31. an energy-saving pump; 32. an energy storage cylinder; 33. an energy-saving accumulator; 34. a first energy-saving overflow valve;
41. a first oil supplementing pump; 42. a second oil supplementing pump;
51. a safety valve; 52. a main overflow valve;
6. a cooling assembly; 61. a cooling pump; 62. a heat exchanger;
71. pre-charging a make-up pump; 72. a first pre-charge make-up fluid shut-off valve; 73. a second pre-charge make-up fluid shut-off valve;
8. a gas-driven component; 81. driving a control valve; 82. a gas-driven main pipe; 83. a second accumulator;
100. a pressure sensor; 200. a first energy-saving stop valve; 300. testing a stop valve; 400. a boost shutoff valve; 500. a position sensor;
1000. a test piece to be tested; 2000. a first energy-saving oil path; 3000. and a second energy-saving oil path.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1 to 4, the present embodiment provides a pulse test stand, including a pressure generator 1, a main pump assembly and an energy-saving assembly, where the pressure generator 1 includes a pressure cylinder 11 and a pressure piston 12, a first piston cavity and at least one second piston cavity are disposed in an inner cavity of the pressure cylinder 11, two ends of the pressure piston 12 are slidably disposed in the first piston cavity and the second piston cavity, respectively, and divide the first piston cavity into a test cavity 131, a first oil cavity 135, a second oil cavity 136 and a first energy-saving pressurizing cavity 134 which are sequentially distributed along an axial direction of the pressure piston 12 and are not communicated with each other, and divide each second piston cavity into a pressure release cavity 133 and a second energy-saving pressurizing cavity 132, where the test cavity 131 is connected with an inlet and an outlet of a test piece 1000 to be tested, and the pressure release cavity 133 is disposed between the first energy-saving pressurizing cavity 134 and the second energy-saving pressurizing cavity 132 and is communicated with an external atmosphere; the main pump assembly comprises a closed pump 21, and two oil ports of the closed pump 21 are respectively communicated with a first oil cavity 135 and a second oil cavity 136; the energy-saving assembly comprises an energy-saving pump 31 and an energy storage unit, wherein an outlet of the energy-saving pump 31 is communicated with the first energy-saving pressurizing cavity 134 and the second energy-saving pressurizing cavity 132 through a first energy-saving oil circuit 2000, and the outlet of the energy-saving pump 31 is connected with the energy storage unit through a second energy-saving oil circuit 3000.
It should be noted that the test piece 1000 to be tested is a gas cylinder, such as a hydrogen gas storage cylinder. Illustratively, the second piston chamber is provided with one. In other embodiments, the second piston chamber may be provided with two, or three, or more.
Before the fatigue test is performed, the energy-saving pump 31 is controlled to work, the energy storage unit is pressurized, and after the pressurization is completed, the closed pump 21 is controlled to work to perform the fatigue test on the workpiece 1000 to be tested.
By arranging more than one energy-saving pressurizing cavity, the contact area between the pressure oil fed into the energy-saving pressurizing cavity and the pressure piston 12 is increased, the pressure of the pressure oil fed into the energy-saving pressurizing cavity can be reduced under the same pressure, the energy consumption is reduced, the energy can be saved by about 50 percent under the same working condition of arranging the energy storage unit, the energy utilization rate is greatly improved, and the service life of the energy storage unit is prolonged; the first oil cavity 135 and the second oil cavity 136 are arranged between the test cavity 131 and the second energy-saving pressurizing cavity 132, so that the pressure difference between two sides of the pressure piston 12 is reduced by utilizing the first energy-saving pressurizing cavity 134 and the second energy-saving pressurizing cavity 132, and the service life of the closed pump 21 is prolonged. The pulse test bed is particularly suitable for fatigue test of high-capacity gas cylinders.
In some embodiments, the energy storage unit comprises an energy storage cylinder 32 and an energy-saving energy storage device 33, wherein the energy storage cylinder 32 comprises an energy storage cylinder body and an energy storage piston, the energy storage piston is slidably arranged in the energy storage cylinder body and divides the inner cavity of the energy storage cylinder body into an energy storage oil cavity and an energy storage air cavity, and the energy-saving energy storage device 33 is communicated with the energy storage air cavity. A second energy-saving pressure sensor is arranged on the connecting oil path between the energy-saving air cavity and the energy-saving energy accumulator 33.
When the energy storage unit is pressurized, the energy-saving pump 31 sends pressure oil into the energy storage oil cavity through the energy-saving oil way, and the pressure in the energy storage air cavity is gradually increased through the movement of the energy storage piston. After the pressure is built, when the closed pump 21 works to perform fatigue test, the oil pressure in the first energy-saving pressurizing oil cavity and the second energy-saving oil cavity can be stabilized through the energy storage unit. Compared with the prior art adopting a single energy accumulator, the energy storage unit combining the energy storage cylinder 32 and the energy-saving energy accumulator 33 has longer service life, and is more suitable for fatigue test of a high-capacity gas cylinder.
It should be noted that, in order to meet the requirement of the fatigue test, in other embodiments, more than one energy storage unit may be provided, and two, or three, or more may be provided, which is specifically determined according to the capacity of the test piece 1000 to be tested, and is not specifically limited herein.
In some embodiments, the outlet of the energy-saving pump 31 is connected with an energy-saving main oil path, one end of the energy-saving main oil path is simultaneously connected with the first energy-saving oil path 2000 and the second energy-saving oil path 3000, and the energy-saving main oil path is provided with a first energy-saving overflow valve 34, a first energy-saving one-way valve, an energy-saving filter and a first energy-saving pressure sensor which are sequentially arranged.
Optionally, the pressure of the first economizer relief valve 34 may be adjustable. By adjusting the opening of the first energy-saving overflow valve 34, the use requirements of different working conditions can be met, and the energy-saving effect is ensured to be met.
In some embodiments, a first energy-saving switch valve is arranged on the second energy-saving main oil way, an outlet of the first energy-saving switch valve is connected with a second energy-saving overflow valve, and the second energy-saving overflow valve is connected with the hydraulic oil tank through a second energy-saving check valve. The energy-saving assembly further comprises a second energy-saving switch valve and a first energy-saving stop valve 200, and any two of the second energy-saving switch valve, the first energy-saving stop valve 200 and the second energy-saving overflow valve are arranged in parallel.
In some embodiments, the pulse test stand further includes a pressure sensor 100 for detecting a pressure of an inlet and an outlet of the test piece 1000 to be tested, and a position sensor 500 for detecting a displacement of the pressure piston 12; the closed pump 21 is a closed pump comprising a swing angle sensor and an LVDT, the main pump assembly further comprises a pilot pump 23 and a displacement control valve 22, the pilot pump 23 controls the swash plate of the closed pump 21 to rotate through the displacement control valve 22, and the displacement control valve 22 is a servo valve or a proportional valve; the first energy saving oil way 2000 is provided with a first energy saving stop valve 200, and the first energy saving stop valve 200 is used for controlling the on-off of the first energy saving oil way 2000. It should be noted that, LVDT full scale Linear Variable Differential Transformer, chinese short for linear variable differential transformer belongs to linear displacement sensor. The displacement of the closed pump 21 can be controlled by a displacement control valve 22, an LVDT and a pilot pump 23, and the displacement of the closed pump 21 is commonly called inner ring control. Illustratively, the displacement control valve 22 is a servo valve.
The first energy-saving pressurizing cavity 134 and the second energy-saving pressurizing cavity 132 are connected with a hydraulic oil tank through a pressurizing stop valve 400, and the testing cavity 131 is connected with a testing medium tank through a testing stop valve 300; the pulse test stand further comprises a pre-filling liquid pump 71, the outlet of the pre-filling liquid pump 71 is connected with a first pre-filling liquid stop valve 72, the outlet of the first pre-filling liquid stop valve 72 is connected with the inlet and the outlet of the test piece 1000 to be tested and the test cavity 131, and a second pre-filling liquid stop valve 73 is arranged on a connecting pipeline between the outlet of the first pre-filling liquid stop valve 72 and the test cavity 131.
The pulse test bed has two working modes, namely a pressure control mode and a position control mode, wherein the position control mode is used for exhausting and supplementing oil, and the pressure control mode is used for pulse fatigue test. The pulse test bed also comprises a control component and an HMI human-computer interaction component connected with the control component, wherein the HMI is called Human Machine Interface, and Chinese is called human-computer interface for short.
The exhaust process is as follows: the HMI human-computer interaction component sends a position instruction, the booster stop valve 400, the first energy-saving stop valve 200 and the test stop valve 300 are opened, the pilot pump 23, the closed pump 21, the first oil supplementing pump 41 and the second oil supplementing pump 42 are started, the detection signal of the position sensor 500 is compared with the position instruction, the displacement control valve 22 is controlled according to the comparison result, the swing angle control of the closed pump 21 is realized, the position adjustment of the pressure piston 12 is realized, and the exhaust is carried out. This way of adjusting the displacement of the closed pump 21 is commonly referred to as performing an outer ring position closed loop control of the displacement of the closed pump 21.
The pulse test stand provided by the embodiment can realize two layers of closed-loop control inside and outside, wherein the inner ring control is the swing angle position control of the closed pump 21, the outer ring control is the pressure closed-loop control of the pressure sensor, and by adopting the cooperation of the two, the rigidity and the response speed of the pulse test stand during fatigue test can be improved, and the problems of poor system tracking performance and high debugging difficulty during single pressure control can be avoided.
The pulse fatigue test process is as follows: the HMI human-computer interaction component sends a pressure instruction, the test stop valve 300 and the pressurization stop valve 400 are closed, the energy-saving pump 31 is started to build pressure on the energy storage unit, the working mode of the test bed is switched to a pressure control mode, the detection signal of the pressure sensor 100 is compared with the pressure instruction, the displacement control valve 22 is controlled according to the comparison result, the swing angle control of the closed pump 21 is realized, the pressure control of the pressure generator 1 is realized, and finally the pulse fatigue test of specific pressure and period of the test piece 1000 to be tested is realized. The mode of adjusting the displacement of the closed pump 21 is commonly called outer ring pressure closed loop control of the displacement of the closed pump 21, good instruction tracking performance can be achieved, common pressure tracking instruction types comprise sine, triangular wave, square wave, water hammer wave and other pulse test curves, and the pulse test bed can well reproduce the waveform of the pressure tracking instruction.
In some embodiments, a fluid-replenishing overflow valve and a first fluid-replenishing one-way valve which are sequentially arranged are connected between the outlet of the pre-charge fluid pump 71 and the first pre-charge fluid stop valve 72; the outlet of the first pre-charge fluid stop valve 72 is provided with a second fluid check valve.
In some embodiments, the communication oil path of the pilot pump 23 and the displacement control valve 22 is provided with a pilot relief valve, a pilot check valve, an oil filter, a first accumulator 24, and a pilot pressure sensor, which are disposed in this order.
In some embodiments, test shut-off valve 300, first pre-charge fluid shut-off valve 72, and second pre-charge fluid shut-off valve 73 are all pneumatically controlled valves; the pulse test stand further comprises an air driving assembly 8, the air driving assembly 8 comprises an air source, an air driving main pipe 82 and air driving branch pipes, the air source is respectively connected to the three air driving branch pipes through the air driving main pipe 82, the three air driving branch pipes are respectively connected to the three air control valves, and each air driving branch pipe is provided with a driving control valve 81. So arranged, the corresponding pneumatic control valve is controlled to be opened or closed by driving the control valve 81.
Optionally, a manual stop valve, an air filter, a pressure reducing valve and a second accumulator 83 are arranged on the air-driven main pipe 82, the on-off of the air-driven main pipe 82 is controlled through the manual stop valve, the air filter is used for filtering air in the air-driven main pipe 82, the pressure reducing valve is used for reducing the pressure of the air in the air-driven main pipe 82, and the second accumulator 83 is used for stabilizing the air pressure in the air-driven main pipe 82.
The working mode of the pulse test bed is switched from the pressure control mode to the position control mode, so that oil is replenished again, and the test is continued until the set number of tests is completed. For this purpose, one oil port of the closed pump 21 is connected to the first oil chamber 135 through a first oil path, and the other oil port of the closed pump 21 is connected to the second oil chamber 136 through a second oil path; the pulse test stand further comprises an oil supplementing assembly, the oil supplementing assembly comprises a first oil supplementing pump 41 and a second oil supplementing pump 42, the first oil supplementing pump 41 is in one-way conduction with the first oil way through a first oil supplementing one-way valve, the first oil supplementing pump 41 is in one-way conduction with the second oil way through a second oil supplementing one-way valve, and the second oil supplementing pump 42 is in one-way conduction with the first energy-saving oil way 2000 and the second energy-saving oil way 3000 through a third oil supplementing one-way valve. Illustratively, the first and second supplemental pumps 41, 42 are dual pumps, driven by the same motor.
The oil supplementing process is as follows: the first energy saving stop valve 200 is closed, the operation mode of the pulse test stand is switched to the position control mode, and the first oil supplementing pump 41 and the second oil supplementing pump 42 are controlled to work for supplementing oil.
Under the pressure control mode, an energy-saving assembly is connected; in the position control mode, the first energy saving shut-off valve 200 is cut off, and the connection between the energy saving assembly and the pressure generator 1 is cut off, facilitating the movement of the pressure piston 12.
Optionally, the first oil compensating pump 41 is connected with a first oil compensating oil path, the first oil compensating oil path is in unidirectional conduction with the first oil path through a first oil compensating one-way valve, the first oil compensating oil path is in unidirectional conduction with the second oil path through a second oil compensating one-way valve, and a fourth oil compensating one-way valve, a first oil compensating overflow valve, a first oil compensating filter and a first oil compensating pressure sensor are sequentially arranged on the first oil compensating oil path.
The second oil supplementing pump 42 is connected with a second oil supplementing oil path, the second oil supplementing oil path is in one-way conduction with the first energy-saving oil path 2000 and the second energy-saving oil path 3000 through a third oil supplementing one-way valve, and a fifth oil supplementing one-way valve, a second oil supplementing overflow valve, a second oil supplementing filter, a sixth oil supplementing one-way valve and a second oil supplementing pressure sensor are sequentially arranged on the second oil supplementing oil path.
In some embodiments, the pulse test stand further includes a relief valve 51, the relief valve 51 being capable of selectively connecting either the first oil passage and the second oil passage to the hydraulic tank through the main relief valve 52, or disconnecting both the first oil passage and the second oil passage from the main relief valve 52; the relief valve 51 is a pilot operated valve, and the first oil passage and the second oil passage are respectively connected to two pilot ends of the relief valve 51.
When the oil pressures in the first and second oil passages are different, the oil pressures at the two pilot ends of the relief valve 51 are different, and the relief valve 51 is switched to a state in which the pressure oil in the higher pressure oil passage of the first and second oil passages flows to the main relief valve 52 through the relief valve 51, the main relief valve 52 is opened when the oil pressure between the relief valve 51 and the main relief valve 52 reaches the opening oil pressure of the main relief valve 52.
In some embodiments, the first oil passage is connected to the second oil passage by a first high pressure relief check valve, and the second oil passage is connected to the first oil passage by a second high pressure relief check valve. The opening pressure of the first high pressure relief check valve is equal to the opening pressure of the second high pressure relief check valve and is greater than the opening pressure of the main relief valve 52. When the oil pressure in the first oil way and the second oil way is too high, the oil pressure balance of the first oil way and the second oil way can be quickly realized through the first high-pressure one-way overflow valve and the second high-pressure one-way overflow valve, so that the safety of a system is ensured. And oil way pressure sensors are arranged on the first oil way and the second oil way.
In some embodiments, the pulse test stand further comprises a cooling assembly 6, the cooling assembly 6 comprising a cooling pump 61 and a heat exchanger 62, wherein an inlet of the cooling pump 61 is connected to the hydraulic oil tank, the heat exchanger 62 has a cooling oil passage and a cooling water passage, and an outlet of the cooling pump 61 is connected to the hydraulic oil tank through the cooling oil passage, and the cooling water passage is for circulating cooling water.
The cooling pump 61 is started to return the pressure oil in the hydraulic oil tank to the hydraulic oil tank through the cooling oil passage, and cooling water is continuously introduced into the cooling water passage, so that the purpose of cooling the pressure oil fed into the cooling oil passage is achieved.
Optionally, a cooling relief valve and a cooling oil filter are connected between the outlet of the cooling pump 61 and the heat exchanger 62 in sequence.
The working process of fatigue test by adopting the pulse test stand is as follows:
(1) The first prefill fluid stop valve 72 is opened, and the test medium is prefilled into the test piece 1000 to be tested and the test chamber 131 of the pressure generator 1 by the prefill fluid pump 71.
(2) Switching to a position control mode, sending a position command through the HMI human-computer interaction component, opening the booster stop valve 400, the first energy-saving stop valve 200 and the test stop valve 300, starting the pilot pump 23, the closed pump 21, the first oil supplementing pump 41 and the second oil supplementing pump 42, comparing a detection signal of the position sensor 500 with the position command, controlling the displacement control valve 22 according to a comparison result, realizing swing angle control of the closed pump 21, and then realizing position adjustment of the pressure piston 12, and exhausting.
(3) Switching to a pressure control mode, sending a pressure instruction through the HMI human-computer interaction component, closing the test stop valve 300 and the pressurization stop valve 400, restarting the energy-saving pump 31 to build pressure on the energy storage unit, comparing a detection signal of the pressure sensor 100 with the pressure instruction, controlling the displacement control valve 22 according to a comparison result, realizing the swing angle control of the closed pump 21, realizing the pressure control of the pressure generator 1, and finally realizing the pulse fatigue test of specific pressure and period of the test piece 1000 to be tested. In step (3), the pump is started and the opened valve in step (2) is continuously maintained in step (2).
(4) And in the test process, the test bench can slowly leak inwards, the first energy-saving stop valve 200 is closed, the position control mode is switched to be switched to, and oil supplementing is carried out, so that the test is continued until the set test times are completed.
The pulse test stand provided by the embodiment adopts the displacement control valve 22 to control the displacement of the closed pump 21, belongs to a pump-controlled closed hydraulic system, saves energy by about 50% under the same working condition compared with the existing valve-controlled open hydraulic system, adopts the energy-saving assembly and the pressure generator 1 provided with the first energy-saving pressurizing cavity 134 and the second energy-saving pressurizing cavity 132 to balance the loads on two sides of the closed pump 21, and prolongs the service life of the closed pump 21; the energy consumption can be further reduced by combining pressure control, and the energy can be saved by about 50% under the same working condition.
Furthermore, the foregoing description of the preferred embodiments and the principles of the invention is provided herein. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A pulse test stand, comprising:
the pressure generator (1), pressure generator (1) includes pressure cylinder body (11) and pressure piston (12), be equipped with first piston chamber and at least one second piston chamber in the inner chamber of pressure cylinder body (11), the both ends of pressure piston (12) are slided respectively and are located first piston chamber and in the second piston chamber, and will first piston chamber divide into along the axial of pressure piston (12) distributes in proper order and each other not test chamber (131), first oil pocket (135), second oil pocket (136) and first energy-conserving booster chamber (134), and will every second piston chamber divide into pressure release chamber (133) and second energy-conserving booster chamber (132), test chamber (131) links to each other with the exit of test piece (1000) that awaits measuring, pressure release chamber (133) are located between first energy-conserving booster chamber (134) and the second energy-conserving booster chamber (132) and with external atmosphere intercommunication;
the main pump assembly comprises a closed pump (21), and two oil ports of the closed pump (21) are respectively communicated with the first oil cavity (135) and the second oil cavity (136);
the energy-saving assembly comprises an energy-saving pump (31) and an energy storage unit, wherein an outlet of the energy-saving pump (31) is communicated with the first energy-saving pressurizing cavity (134) and the second energy-saving pressurizing cavity (132) through a first energy-saving oil circuit (2000), and the outlet of the energy-saving pump (31) is connected with the energy storage unit through a second energy-saving oil circuit (3000);
the energy storage unit includes:
the energy storage cylinder (32), the energy storage cylinder (32) comprises an energy storage cylinder body and an energy storage piston, the energy storage piston is arranged in the energy storage cylinder body in a sliding manner and divides the inner cavity of the energy storage cylinder body into an energy storage oil cavity and an energy storage air cavity;
and the energy-saving energy accumulator (33), and the energy-saving energy accumulator (33) is communicated with the energy storage air cavity.
2. The pulse test stand according to claim 1, further comprising a pressure sensor (100) and a position sensor (500), the pressure sensor (100) being adapted to detect a pressure of an inlet and an outlet of the test piece (1000) to be tested, the position sensor (500) being adapted to detect a displacement of the pressure piston (12);
the closed pump (21) is a closed pump comprising a swing angle sensor and an LVDT, the main pump assembly further comprises a pilot pump (23) and a displacement control valve (22), the pilot pump (23) controls a swash plate of the closed pump (21) to rotate through the displacement control valve (22), and the displacement control valve (22) is a servo valve or a proportional valve;
the first energy-saving oil way (2000) is provided with a first energy-saving stop valve (200), and the first energy-saving stop valve (200) is used for controlling the on-off of the first energy-saving oil way (2000).
3. Pulse test bench according to claim 2, characterized in that the communication oil circuit of the pilot pump (23) and the displacement control valve (22) is connected with a first accumulator (24).
4. The pulse test stand according to claim 1, characterized in that the outlet of the energy-saving pump (31) is connected with a first energy-saving overflow valve (34), the pressure of the first energy-saving overflow valve (34) being adjustable.
5. The pulse test stand according to claim 1, characterized in that one oil port of the closed pump (21) is connected to the first oil chamber (135) through a first oil path, and the other oil port of the closed pump (21) is connected to the second oil chamber (136) through a second oil path;
the pulse test bed further comprises an oil supplementing assembly, the oil supplementing assembly comprises a first oil supplementing pump (41) and a second oil supplementing pump (42), the first oil supplementing pump (41) is in one-way conduction with the first oil way through a first oil supplementing one-way valve, the first oil supplementing pump (41) is in one-way conduction with the second oil way through a second oil supplementing one-way valve, and the second oil supplementing pump (42) is in one-way conduction with the first energy-saving oil way (2000) through a third oil supplementing one-way valve and the second energy-saving oil way (3000).
6. The pulse test stand according to claim 5, further comprising a relief valve (51), wherein the relief valve (51) is capable of selectively connecting either one of the first oil passage and the second oil passage to a hydraulic tank via a main relief valve (52) or disconnecting both the first oil passage and the second oil passage from the main relief valve (52);
the safety valve (51) is a hydraulic control valve, and the first oil way and the second oil way are respectively connected to two pilot ends of the safety valve (51).
7. Pulse test bench according to claim 1, characterized in that it further comprises a cooling assembly (6), said cooling assembly (6) comprising:
a cooling pump (61), wherein an inlet of the cooling pump (61) is connected with a hydraulic oil tank;
the heat exchanger (62) is provided with a cooling oil duct and a cooling water channel, the outlet of the cooling pump (61) is connected with the hydraulic oil tank through the cooling oil duct, and the cooling water channel is used for circulating cooling water.
8. The pulse test stand according to claim 1, characterized in that the first energy-saving pressurizing cavity (134) and the second energy-saving pressurizing cavity (132) are connected with a hydraulic oil tank through a pressurizing stop valve (400), and the test cavity (131) is connected with a test medium tank through a test stop valve (300);
the pulse test bed further comprises a pre-filling liquid supplementing pump (71), an outlet of the pre-filling liquid supplementing pump (71) is connected with a first pre-filling liquid supplementing stop valve (72), an outlet of the first pre-filling liquid supplementing stop valve (72) is connected with an inlet and an outlet of the test piece (1000) to be tested and the test cavity (131), and a second pre-filling liquid supplementing stop valve (73) is arranged on a connecting pipeline of the first pre-filling liquid supplementing stop valve (72) and the test cavity (131).
9. The pulse test bench according to claim 8, characterized in that the test shut-off valve (300), the first pre-charge fluid shut-off valve (72) and the second pre-charge fluid shut-off valve (73) are all pneumatically controlled valves;
the pulse test bench further comprises an air driving assembly (8), the air driving assembly (8) comprises an air source, an air driving main pipe (82) and air driving branch pipes, the air source is connected to the three air driving branch pipes respectively through the air driving main pipe (82), the three air driving branch pipes are connected to the three air control valves respectively, and each air driving branch pipe is provided with a driving control valve (81).
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| CN219119557U (en) * | 2022-12-05 | 2023-06-02 | 浙江邦烨自动化科技有限公司 | Oil pressure cylinder |
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| CN103133434A (en) * | 2013-02-26 | 2013-06-05 | 王文雯 | Energy storage type energy-saving hydraulic pumping unit |
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| CN116793821A (en) | 2023-09-22 |
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