CN112284882A - Pressure fatigue testing machine - Google Patents
Pressure fatigue testing machine Download PDFInfo
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- CN112284882A CN112284882A CN202011234989.4A CN202011234989A CN112284882A CN 112284882 A CN112284882 A CN 112284882A CN 202011234989 A CN202011234989 A CN 202011234989A CN 112284882 A CN112284882 A CN 112284882A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 230000005284 excitation Effects 0.000 abstract description 5
- 230000010349 pulsation Effects 0.000 abstract description 3
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a pressure fatigue testing machine, relates to a periodic pulsating pressure excitation source with adjustable pressure amplitude and frequency, and belongs to the technical field of tests. The pressure measuring device comprises a cam, a piston rod, a cylinder body, a piston, a pressure guide port, a spring, a first measured pressure sensor and a second measured pressure sensor. The motor is rigidly connected with the cam, and the piston rod is connected with the excircle of the cam; the piston rod is rigidly connected with the cylinder body, the cylinder body is matched and installed with the piston, and the first pressure sensor to be measured and the second pressure sensor to be measured are installed at the top of the cylinder body; the pressure guide port is arranged at the lower end of the cylinder body; one end of the spring is rigidly connected with the piston, and the other end of the spring is rigidly connected with the side wall of the cylinder body. The invention adopts the motor to drive the cam as the pressure excitation source, and obtains the required pressure waveform by controlling the outer contour of the cam. The invention can generate various alternating pressure signals such as sine waves, square waves and the like, and the amplitude and the frequency of the pulsation can be adjusted in a large range, thereby having the advantages of high durability and high reliability.
Description
Technical Field
The invention relates to a pressure fatigue testing machine, in particular to a pulsating pressure excitation source with adjustable pressure amplitude and frequency, and belongs to the technical field of tests.
Background
With the improvement of the reliability requirements of various pressure devices in the industrial field, more and more items are listed in the examination by utilizing the alternation of high pressure and low pressure to carry out pressure fatigue tests. The service life of the pressure measuring equipment is examined through a fatigue life test (accelerated life test) according to the regulations of national standard GB/T15478-1995 and national military standard GJB 4409A-2011. The technical requirements of European and American countries on pressure fatigue tests are far higher than those of China, if the pressure cycle times are required to reach one million or even ten million times and far exceed ten thousand times required by the general pressure sensor standard, the corresponding test means are more perfect and advanced. The technical capability of the domestic existing equipment can not meet the technical requirements of the national pressure fatigue test, and the special gas pressure fatigue test equipment is lacked.
Disclosure of Invention
The invention aims to provide a durable and reliable pressure generator suitable for gas and liquid pressure fatigue tests, which can generate large-amplitude periodic pressure pulsation. The invention adopts the motor to drive the cam as the pressure excitation source, and obtains the required pressure waveform by designing the outer contour of the cam. The invention has the main advantages that various alternating pressure signals such as sine waves, square waves and the like can be generated, the amplitude and the frequency of the pulsation can be adjusted in a large range, and the durability and the reliability can be improved.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a pressure fatigue testing machine which comprises a cam, a piston rod, a cylinder body, a piston, a pressure guide port, a spring, a first tested pressure sensor and a second tested pressure sensor. The pressure fatigue testing machine consists of a driving part and a generating part; the motor is rigidly connected with the cam, and the piston rod is connected with the excircle of the cam; the piston rod is rigidly connected with the cylinder body, the cylinder body is matched and installed with the piston, and the first pressure sensor to be measured and the second pressure sensor to be measured are installed at the top of the cylinder body; the pressure guide port is arranged at the lower end of the cylinder body; one end of the spring is rigidly connected with the piston, and the other end of the spring is rigidly connected with the side wall of the cylinder body.
The working method of the pressure fatigue testing machine disclosed by the invention comprises the following steps: when a pressure fatigue test is carried out, a first pressure sensor to be tested and a second pressure sensor to be tested are installed on the upper wall of a cylinder body, then calculation is carried out according to pressure amplitude values to be tested of the first pressure sensor to be tested and the second pressure sensor to be tested, half of the maximum pressure value of the test is selected to charge pressure into the cylinder body, pressure media flow into the cylinder body through a pressure introduction port, the media select gas or liquid according to requirements, after the pressure in the cylinder body reaches a set value, a motor is started, the rotation of a cam drives a piston rod to reciprocate, the frequency to be tested is set, the rotating speed of the motor is adjusted, fatigue test signals are input according to the outer circle shape of the cam, the piston rod and a spring act on the piston to generate corresponding displacement changes, and the piston generates corresponding pulsating pressure changes in the cylinder body through the displacement changes.
Preferably, the fatigue test signal comprises a sine wave or a square wave.
Has the advantages that:
1. compared with the traditional fatigue testing machines, the pressure fatigue testing machine disclosed by the invention has the advantages that the motor drives the cam to push the piston rod to generate pulsating pressures with different frequencies and different types, the cam rotation is used as an excitation source, different cam excircles can be arranged according to required waveforms, various pressure signals such as sine waves, square waves and the like are realized, the structure is simple, and the operation is easy.
2. The pressure fatigue testing machine disclosed by the invention can generate pressure signals with different frequencies and different types, the frequency and the pressure values are adjustable, and the pressure life test under different conditions can be realized; and the whole structure is simple and reliable, and the whole fatigue testing machine has no wearing parts, so that the fatigue testing machine has very high durability and reliability when pressure fatigue tests are carried out for tens of thousands of times or even ten thousands of times.
3. According to the pressure fatigue testing machine disclosed by the invention, the upper end of the cylinder body can be provided with a plurality of tested pressure sensors for testing at the same time, the device can ensure that each tested pressure sensor can feel the same pressure amplitude change, and aiming at experiments of low frequency and last ten thousand cycles, the testing efficiency can be effectively improved, and the time is saved.
4. According to the pressure fatigue testing machine disclosed by the invention, the medium is selected from gas or liquid, the initial state can be a normal pressure state, a negative pressure state and a high pressure state, different balance pressures can be simulated, the requirements of different types of sensors are met, the fluid medium in the cylinder is recovered after the test is finished, the environment is not polluted, the treatment is convenient, the maintenance is simple, and the pipeline is not easy to block.
Drawings
FIG. 1 is a schematic structural view of a pressure fatigue testing machine disclosed by the invention;
the pressure measuring device comprises a cam 1, a piston rod 2, a cylinder 3, a piston 4, a pressure leading port 5, a spring 6, a first pressure sensor to be measured 7 and a second pressure sensor to be measured 8.
FIG. 2 is a schematic diagram of a cam producing a sine wave;
fig. 3 is a schematic diagram of a cam for generating a square wave.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1:
as shown in fig. 1, the pressure fatigue testing machine disclosed in this embodiment includes a cam 1, a piston rod 2, a cylinder 3, a piston 4, a pressure inlet 5, a spring 6, a first pressure sensor 7 to be tested, and a second pressure sensor 8 to be tested. The pressure fatigue testing machine consists of a driving part and a generating part; the motor is rigidly connected with the cam 1, and the piston rod 2 is connected with the excircle of the cam 1; the piston rod 2 is rigidly connected with the cylinder body 3, the cylinder body 3 is matched and installed with the piston 4, and the first pressure sensor 7 to be measured and the second pressure sensor 8 to be measured are installed at the top of the cylinder body 3; the pressure guide port 5 is arranged at the lower end of the cylinder body 3; one end of the spring 6 is rigidly connected with the piston 4, and the other end is rigidly connected with the side wall of the cylinder 3.
The test requires that a pressure sensor with the measuring range of 100kPa carries out a square wave pressure test of 5Hz, the test times are 10000 times, the medium is gas, and 2 tested sensors are tested simultaneously. The working method of the pressure fatigue testing machine disclosed by the embodiment comprises the following steps: when a gas pressure fatigue test is carried out, firstly, a first measured pressure sensor 7 and a second measured pressure sensor 8 with the measuring range of 100kPa are installed on the upper wall of a cylinder body 5, according to the use environment of the first measured pressure sensor 7 and the second measured pressure sensor 8, a medium is used as gas, a motor is started, a cam 1 adopts an excircle capable of generating a square wave signal, the piston rod 2 can be driven to reciprocate by the rotation of the cam 1 as shown in the figure, the rotating speed of the motor is adjusted, the test frequency is set to be 5Hz, according to the excircle shape of the cam 1, as shown in figure 3, the fatigue test signal can be input into the square wave signal, the piston rod 2 and a spring 6 act on a piston 4 to generate corresponding displacement change, and the piston 4 generates corresponding square wave pressure change in the cylinder body 3 through the displacement change.
Example 2
As shown in fig. 1, the pressure fatigue testing machine disclosed in this embodiment includes a cam 1, a piston rod 2, a cylinder 3, a piston 4, a pressure inlet 5, a spring 6, a first pressure sensor 7 to be tested, and a second pressure sensor 8 to be tested. The pressure fatigue testing machine consists of a driving part and a generating part; the motor is rigidly connected with the cam 1, and the piston rod 2 is connected with the excircle of the cam 1; the piston rod 2 is rigidly connected with the cylinder body 3, the cylinder body 3 is matched and installed with the piston 4, and the first pressure sensor 7 to be measured and the second pressure sensor 8 to be measured are installed at the top of the cylinder body 3; the pressure guide port 5 is arranged at the lower end of the cylinder body 3; one end of the spring 6 is rigidly connected with the piston 4, and the other end is rigidly connected with the side wall of the cylinder 3;
the test requires that a pressure sensor with the measuring range of 20MPa is used for conducting a sine wave pressure test of 3Hz, the test times are 10000 times, the medium is liquid, and only one sensor is used for testing. In the pressure fatigue testing machine disclosed in this embodiment, when performing a hydraulic pressure fatigue test, first, the cylinder body 3 is replaced with a high pressure resistant hydraulic cylinder, the cam 1 is replaced with an outer circle capable of generating a sine wave, as shown in fig. 2, a first pressure sensor 7 to be calibrated having a range of 20MPa is mounted on the upper wall of the cylinder 3, then, the pressure amplitude value to be tested of the first calibrated pressure sensor 7 is calculated, half 9MPa of the maximum test pressure value 18MPa is selected to be pressurized in the cylinder body 3, according to the using environment of the first calibrated pressure sensor 7, the medium is liquid, after the pressure in the cylinder 3 reaches the set value, the motor is started, the piston rod 2 can be driven to reciprocate by the rotation of the cam 1, the rotating speed of the motor is adjusted, the test frequency is set to be 3Hz, the piston rod 2 and the spring 6 act on the piston 4 to generate corresponding displacement change, and the piston 4 generates corresponding sine pressure change in the cylinder body 3 through the displacement change.
The mechanical structure has very long service life and long-time continuous use capacity, the used fluid medium can be switched according to the requirement of the pressure sensor to be calibrated, the frequency, the pressure amplitude and the signal type can be switched and selected, and the whole set of device has high compatibility and wide use range.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A pressure fatigue testing machine is characterized in that: the device comprises a cam (1), a piston rod (2), a cylinder body (3), a piston (4), a pressure guide port (5), a spring (6), a first measured pressure sensor (7) and a second measured pressure sensor (8);
the pressure fatigue testing machine consists of a driving part and a generating part; the motor is rigidly connected with the cam (1), and the piston rod (2) is connected with the excircle of the cam (1); the piston rod (2) is rigidly connected with the cylinder body (3), the cylinder body (3) is installed with the piston (4) in a matching way, and the first pressure sensor (7) to be measured and the second pressure sensor (8) to be measured are installed at the top of the cylinder body (3); the pressure guide port (5) is arranged at the lower end of the cylinder body (3); one end of the spring (6) is rigidly connected with the piston (4), and the other end is rigidly connected with the side wall of the cylinder body (3).
2. A pressure fatigue testing machine according to claim 1, wherein: the working method comprises the steps that when a pressure fatigue test is carried out, a first pressure sensor (7) to be tested and a second pressure sensor (8) to be tested are installed on the upper wall of a cylinder body (3), then calculation is carried out according to pressure amplitude values needing to be tested of the first pressure sensor (7) to be tested and the second pressure sensor (8), half of the maximum pressure value of the test is selected to be charged into the cylinder body (3), pressure medium flows into the cylinder body (3) through a pressure introduction port (5), gas or liquid is selected as medium according to requirements, after the pressure in the cylinder body (3) reaches a set value, a motor is started, the piston rod (2) is driven to reciprocate by rotation of a cam (1), the frequency needing to be tested is set, the rotating speed of the motor is adjusted, a fatigue test signal is input according to the outer circle shape of the cam (1), and the piston rod (2) and a spring (6) act on a piston (4) to generate corresponding displacement change, the piston (4) generates corresponding pulsating pressure changes in the cylinder (3) through the change of displacement.
3. A pressure fatigue testing machine according to claim 2, wherein: the fatigue test signal comprises sine waves and square waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011234989.4A CN112284882A (en) | 2020-11-08 | 2020-11-08 | Pressure fatigue testing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011234989.4A CN112284882A (en) | 2020-11-08 | 2020-11-08 | Pressure fatigue testing machine |
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| CN112284882A true CN112284882A (en) | 2021-01-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113607358A (en) * | 2021-07-30 | 2021-11-05 | 西安昆仑工业（集团）有限责任公司 | High-frequency striker spring fatigue test device and test method |
| CN114323425A (en) * | 2021-12-17 | 2022-04-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Portable square wave pressure fatigue testing machine of binary channels |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5856867A (en) * | 1997-07-28 | 1999-01-05 | Litton Systems, Inc. | Method and apparatus for determining the pressure-induced nonreciprocity of a fiber-optic coil |
| CN102564684A (en) * | 2011-12-27 | 2012-07-11 | 中国科学院合肥物质科学研究院 | Method for multi-dimensional sensor dynamic test device based on stable-state sine excitation force |
| CN103362903A (en) * | 2012-04-10 | 2013-10-23 | 上海示才生物科技有限公司 | Low-frequency micro pulsating pressure generator |
| CN103499441A (en) * | 2013-10-22 | 2014-01-08 | 西华大学 | Mechanical spring fatigue testing machine suitable for multiple compression amount requirements |
| CN104330210A (en) * | 2014-10-30 | 2015-02-04 | 北京航天计量测试技术研究所 | Square wave pressure generator in porous turning wheel structure |
| CN104677624A (en) * | 2015-03-19 | 2015-06-03 | 天津航天瑞莱科技有限公司苏州分公司 | Air pressure fatigue load test method and device for train window |
| CN107817101A (en) * | 2017-10-31 | 2018-03-20 | 南昌大学 | A kind of endurance experimental provision of engineering mechanics |
| CN108362437A (en) * | 2018-04-16 | 2018-08-03 | 无锡盛赛传感科技有限公司 | A kind of pressure sensor test device |
| CN109946020A (en) * | 2019-02-23 | 2019-06-28 | 山东大学 | A kind of test of rapidity pressure sensor dynamic and calibrating installation |
| CN110082031A (en) * | 2019-05-27 | 2019-08-02 | 苏州东菱科技有限公司 | A kind of calibrating installation of pressure sensor |
-
2020
- 2020-11-08 CN CN202011234989.4A patent/CN112284882A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5856867A (en) * | 1997-07-28 | 1999-01-05 | Litton Systems, Inc. | Method and apparatus for determining the pressure-induced nonreciprocity of a fiber-optic coil |
| CN102564684A (en) * | 2011-12-27 | 2012-07-11 | 中国科学院合肥物质科学研究院 | Method for multi-dimensional sensor dynamic test device based on stable-state sine excitation force |
| CN103362903A (en) * | 2012-04-10 | 2013-10-23 | 上海示才生物科技有限公司 | Low-frequency micro pulsating pressure generator |
| CN103499441A (en) * | 2013-10-22 | 2014-01-08 | 西华大学 | Mechanical spring fatigue testing machine suitable for multiple compression amount requirements |
| CN104330210A (en) * | 2014-10-30 | 2015-02-04 | 北京航天计量测试技术研究所 | Square wave pressure generator in porous turning wheel structure |
| CN104677624A (en) * | 2015-03-19 | 2015-06-03 | 天津航天瑞莱科技有限公司苏州分公司 | Air pressure fatigue load test method and device for train window |
| CN107817101A (en) * | 2017-10-31 | 2018-03-20 | 南昌大学 | A kind of endurance experimental provision of engineering mechanics |
| CN108362437A (en) * | 2018-04-16 | 2018-08-03 | 无锡盛赛传感科技有限公司 | A kind of pressure sensor test device |
| CN109946020A (en) * | 2019-02-23 | 2019-06-28 | 山东大学 | A kind of test of rapidity pressure sensor dynamic and calibrating installation |
| CN110082031A (en) * | 2019-05-27 | 2019-08-02 | 苏州东菱科技有限公司 | A kind of calibrating installation of pressure sensor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113607358A (en) * | 2021-07-30 | 2021-11-05 | 西安昆仑工业（集团）有限责任公司 | High-frequency striker spring fatigue test device and test method |
| CN113607358B (en) * | 2021-07-30 | 2024-03-29 | 西安昆仑工业（集团）有限责任公司 | High-frequency firing pin spring fatigue test device and test method |
| CN114323425A (en) * | 2021-12-17 | 2022-04-12 | 中国航空工业集团公司北京长城计量测试技术研究所 | Portable square wave pressure fatigue testing machine of binary channels |
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Application publication date: 20210129 |