CN110631903A - Camera adjusting device for fatigue crack propagation measurement - Google Patents
Camera adjusting device for fatigue crack propagation measurement Download PDFInfo
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- CN110631903A CN110631903A CN201911033399.2A CN201911033399A CN110631903A CN 110631903 A CN110631903 A CN 110631903A CN 201911033399 A CN201911033399 A CN 201911033399A CN 110631903 A CN110631903 A CN 110631903A
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- adjusting device
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- 238000005259 measurement Methods 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 description 9
- 238000009661 fatigue test Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect 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
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
-
- 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
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- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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- 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
A camera adjusting device for fatigue crack propagation measurement comprises a clamping device, a first supporting arm, a second supporting arm, a height adjusting device, a horizontal adjusting device and a camera clamping ring; one end of the first supporting arm is provided with a clamping device, the other end of the first supporting arm is connected with one end of the second supporting arm, the other end of the second supporting arm is provided with a height adjusting device, the end part of the height adjusting device is provided with a horizontal adjusting device, and the end part of the horizontal adjusting device is provided with a camera clamping ring. The application of the worm gear and the worm can solve the problem that the camera moves in the vertical direction and observe the crack propagation condition more comprehensively. The gear rack is applied to solving the problem of movement of the camera in the horizontal direction, and can be matched with the worm and gear to observe the crack trend in all directions.
Description
Technical Field
The invention belongs to the technical field of camera position adjustment, and particularly relates to a camera adjusting device for fatigue crack propagation measurement.
Background
With the development of science and technology, the application of steel structure is more and more common, involves the aspect of life. In order to ensure safety in application, researchers have conducted extensive studies on steel (and aluminum alloy materials), and fatigue crack growth performance is one of them. When the fatigue crack propagation performance is tested, a standard CT sample is adopted according to the ASTM E647 standard, the thickness B is 10mm, the width W is 70mm, the initial crack a0 is 14mm, a fatigue test is carried out by using a 8801 universal fatigue testing machine, under the condition of carrying out the test by a dead load method, the crack length is calculated by a flexibility method, the crack propagation condition is measured by using an own extensometer, but due to the range limitation, when the crack propagates to 40mm, the extensometer exceeds the range, but the CT test piece has not fatigue fracture, at the moment, the flexibility method is switched to a direct reading method, and meanwhile, the extensometer is taken down, and a camera which is 500 times held by hand is used for observing the crack propagation condition. The handheld camera not only wastes human resources, but also wastes time and labor, and the observation result is greatly influenced by human factors, thereby greatly influencing the smooth operation of the experiment. This causes great inconvenience to the progress of the fatigue crack propagation test and hinders the progress of the fatigue test.
Disclosure of Invention
The invention aims to provide a camera adjusting device for fatigue crack propagation measurement, so as to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a camera adjusting device for fatigue crack propagation measurement comprises a clamping device, a first supporting arm, a second supporting arm, a height adjusting device, a horizontal adjusting device and a camera clamping ring; one end of the first supporting arm is provided with a clamping device, the other end of the first supporting arm is connected with one end of the second supporting arm, the other end of the second supporting arm is provided with a height adjusting device, the end part of the height adjusting device is provided with a horizontal adjusting device, and the end part of the horizontal adjusting device is provided with a camera clamping ring.
Furthermore, the clamping device is formed by buckling two semicircular ring structures, the buckling positions are fixedly connected through bolts, and the clamping device is connected with the first supporting arm through a shaft pin.
Furthermore, the first supporting arm and the second supporting arm are both hollow tubular structures, one end of the second supporting arm is inserted into the first supporting arm, and the superposition position of the first supporting arm and the second supporting arm is connected through a shaft pin.
Further, the height adjusting device comprises a rack and a gear; one end of the rack is inserted into the second supporting arm, a gear mounting groove is formed in the side wall of the end part of the second supporting arm, the gear is mounted in the gear mounting groove, and the rack is meshed with the gear.
Furthermore, the gear is installed in the gear installation groove through the pivot, and the gear is connected with the pivot key.
Further, a worm wheel mounting groove is formed in the top of the rack of the horizontal adjusting device; the horizontal adjusting device comprises a worm wheel and a worm; the worm wheel is arranged in the worm wheel mounting groove, a worm is horizontally and transversely arranged in the rack above the worm wheel, and the worm wheel and the worm are meshed with each other; the end of the worm is provided with a camera clamping ring.
Compared with the prior art, the invention has the following technical effects:
the application of the worm gear and the worm can solve the problem that the camera moves in the vertical direction and observe the crack propagation condition more comprehensively.
The gear rack is applied to solving the problem of movement of the camera in the horizontal direction, and can be matched with the worm and gear to observe the crack trend in all directions.
The rotation of the rear supporting arm in the circumferential direction can select one side of the test piece to observe according to actual conditions, and the invention has prominent effect on equipment which is narrow in space and difficult to observe.
The invention has precise matching and small mechanical jitter, is not easy to jitter during observation, and improves the crack observation precision.
The invention has reasonable design, simple structure and low manufacturing cost.
Drawings
Fig. 1 is a schematic structural view (front view) of a camera adjusting device for observing fatigue crack growth for a 8801 fatigue testing machine according to the present invention.
Fig. 2 is a schematic structural diagram (right side view) of the camera adjusting device for observing fatigue crack propagation for the 8801 fatigue testing machine.
FIG. 3 is a schematic view of a second support arm according to the present invention.
In the figure: 1 is a clamping device, 2 is a first supporting arm, 3 is a second supporting arm, and 31 is a gear mounting groove; 4 is a gear rack group, 41 is a gear, and 42 is a rack; 5 is a worm wheel and worm group, 51 is a worm wheel, and 52 is a worm; and 6, a camera holding ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
referring to fig. 1 to 3, a camera adjusting device for fatigue crack propagation measurement includes a clamping device, a first supporting arm 2, a second supporting arm 3, a height adjusting device, a horizontal adjusting device, and a camera clamping ring 6; one end of the first supporting arm 2 is provided with a clamping device, the other end of the first supporting arm 2 is connected with one end of the second supporting arm 3, the other end of the second supporting arm 3 is provided with a height adjusting device, the end part of the height adjusting device is provided with a horizontal adjusting device, and the end part of the horizontal adjusting device is provided with a camera clamping ring 6.
The clamping device is in butt joint with two semicircular ring structures, the butt joint positions are fixedly connected through bolts, and the clamping device is connected with the first supporting arm 2 through a shaft pin.
The first supporting arm 2 and the second supporting arm 3 are both hollow tubular structures, one end of the second supporting arm 3 is inserted into the first supporting arm 2, and the superposition position of the first supporting arm 2 and the second supporting arm 3 is connected through a shaft pin.
The height adjusting means includes a rack 42 and a pinion 41; one end of the rack 42 is inserted into the second support arm 3, a gear mounting groove 31 is formed on the side wall of the end portion of the second support arm 3, the gear 41 is mounted in the gear mounting groove 31, and the rack 42 is engaged with the gear 41.
The gear 41 is installed in the gear installation groove 31 by a shaft pin, and the gear 41 is keyed with the shaft pin.
The top of the horizontal adjusting device rack 42 is provided with a worm wheel mounting groove; the level adjustment device includes a worm wheel 51 and a worm 52; the worm wheel 51 is arranged in the worm wheel mounting groove, the worm 52 is horizontally and transversely arranged in the rack 42 above the worm wheel 51, and the worm wheel 51 and the worm 52 are meshed with each other; the end of the worm 52 is provided with a camera clamping ring 6.
When a 8801 universal fatigue testing machine is used for fatigue crack propagation tests, after the measuring range of the extensometer is exceeded, the flexibility method is changed into the straightness method, and at the moment, a camera is used for observing the fatigue crack propagation condition. Firstly, clamping a clamping device on a frame of a 8801 fatigue testing machine, in order to prevent scratching the frame, a rubber pad can be padded around the clamping claw, and a fixing bolt is screwed after the clamping claw is screwed and adjusted to a proper height; aligning the notch of the first support frame 2 with the clamping lug, and fixing the position between the notch and the clamping lug by using 2 pins; then the second support frame 3 is inserted into the first support frame 2, the second support frame is provided with three pin holes, the length can be adjusted to be proper, the relative position is fixed by pins, and at the moment, the second support frame 3 can be rotated to control the positions of the cameras at the two sides of the test piece according to different placing positions of the testing machine; a rack 42 and a gear 41 are installed, and the gear position is fixed by a pin; a worm wheel 51 and a worm 52 are arranged in the groove, and the worm wheel is fixed; and (4) placing a camera clamping ring, and finishing the installation of the device at the moment.
When the test piece works, the vertical position of the camera can be controlled by rotating the turbine, and after the crack position is found, the camera is righted to be vertical to the test piece; the camera is controlled to move along with the crack by rotating the gear to control the position of the camera in the horizontal direction. And accurately measuring the crack length.
Claims (6)
1. A camera adjusting device for fatigue crack propagation measurement is characterized by comprising a clamping device, a first supporting arm (2), a second supporting arm (3), a height adjusting device, a horizontal adjusting device and a camera clamping ring (6); one end of the first supporting arm (2) is provided with a clamping device, the other end of the first supporting arm (2) is connected with one end of the second supporting arm (3), the other end of the second supporting arm (3) is provided with a height adjusting device, the end part of the height adjusting device is provided with a horizontal adjusting device, and the end part of the horizontal adjusting device is provided with a camera clamping ring (6).
2. The camera adjusting device for fatigue crack propagation measurement as claimed in claim 1, wherein the clamping device is provided with two half-ring structure buckles, the buckles are fixedly connected by bolts, and the clamping device and the first support arm (2) are connected by a shaft pin.
3. The camera adjusting device for fatigue crack propagation measurement as claimed in claim 1, wherein the first support arm (2) and the second support arm (3) are both hollow tubular structures, one end of the second support arm (3) is inserted inside the first support arm (2), and the overlapped part of the first support arm (2) and the second support arm (3) is connected through a shaft pin.
4. A camera adjustment device for fatigue crack propagation measurement according to claim 1, characterized in that the height adjustment device comprises a rack (42) and a gear (41); one end of the rack (42) is inserted into the second supporting arm (3), a gear mounting groove (31) is formed in the side wall of the end part of the second supporting arm (3), the gear (41) is mounted in the gear mounting groove (31), and the rack (42) is meshed with the gear (41).
5. The camera adjustment device for fatigue crack propagation measurement according to claim 4, wherein the gear (41) is mounted in the gear mounting groove (31) by a shaft pin, and the gear (41) is keyed with the shaft pin.
6. The camera adjusting device for fatigue crack propagation measurement as claimed in claim 4, wherein the top of the horizontal adjusting device rack (42) is provided with a worm gear mounting groove; the horizontal adjusting device comprises a worm wheel (51) and a worm (52); a worm wheel (51) is arranged in the worm wheel mounting groove, a worm (52) is horizontally and transversely arranged in the rack (42) above the worm wheel (51), and the worm wheel (51) and the worm (52) are meshed with each other; the end part of the worm (52) is provided with a camera clamping ring (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911033399.2A CN110631903A (en) | 2019-10-28 | 2019-10-28 | Camera adjusting device for fatigue crack propagation measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911033399.2A CN110631903A (en) | 2019-10-28 | 2019-10-28 | Camera adjusting device for fatigue crack propagation measurement |
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| Publication Number | Publication Date |
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| CN110631903A true CN110631903A (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911033399.2A Pending CN110631903A (en) | 2019-10-28 | 2019-10-28 | Camera adjusting device for fatigue crack propagation measurement |
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| CN (1) | CN110631903A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929146A (en) * | 2020-06-18 | 2020-11-13 | 广东石油化工学院 | A observation device for metal material fatigue crack propagation |
| CN114088515A (en) * | 2021-11-02 | 2022-02-25 | 国家高速列车青岛技术创新中心 | Monocular vision multi-view crack propagation monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4838117A (en) * | 1986-08-26 | 1989-06-13 | Maxwell Electronics Limited | Camera panner |
| CN201615857U (en) * | 2009-12-23 | 2010-10-27 | 成都飞机工业（集团）有限责任公司 | Fatigue tester with reading microscope |
| CN105758746A (en) * | 2016-04-09 | 2016-07-13 | 温州经济技术开发区滨海雄杰机电研发工作室 | Glass detection machine provided with worm wheel, rotary table, rack optical-ring camera and molybdenum alloy wheel corner clamp |
| CN108072352A (en) * | 2017-12-13 | 2018-05-25 | 中国飞机强度研究所 | A kind of shaft position sensor clamping device |
| CN208179364U (en) * | 2018-05-03 | 2018-12-04 | 长沙航空职业技术学院 | Fixture with circular edge component |
| CN110031292A (en) * | 2019-04-10 | 2019-07-19 | 上海交通大学 | The online instant measuring system and method for cylindrical structure fatigue growth of surface cracks |
| CN209182142U (en) * | 2018-11-28 | 2019-07-30 | 长安大学 | It is a kind of for observing the camera adjusting mechanism of metal fatigue crack propagation |
| CN210953627U (en) * | 2019-10-28 | 2020-07-07 | 长安大学 | Camera adjusting device |
-
2019
- 2019-10-28 CN CN201911033399.2A patent/CN110631903A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4838117A (en) * | 1986-08-26 | 1989-06-13 | Maxwell Electronics Limited | Camera panner |
| CN201615857U (en) * | 2009-12-23 | 2010-10-27 | 成都飞机工业（集团）有限责任公司 | Fatigue tester with reading microscope |
| CN105758746A (en) * | 2016-04-09 | 2016-07-13 | 温州经济技术开发区滨海雄杰机电研发工作室 | Glass detection machine provided with worm wheel, rotary table, rack optical-ring camera and molybdenum alloy wheel corner clamp |
| CN108072352A (en) * | 2017-12-13 | 2018-05-25 | 中国飞机强度研究所 | A kind of shaft position sensor clamping device |
| CN208179364U (en) * | 2018-05-03 | 2018-12-04 | 长沙航空职业技术学院 | Fixture with circular edge component |
| CN209182142U (en) * | 2018-11-28 | 2019-07-30 | 长安大学 | It is a kind of for observing the camera adjusting mechanism of metal fatigue crack propagation |
| CN110031292A (en) * | 2019-04-10 | 2019-07-19 | 上海交通大学 | The online instant measuring system and method for cylindrical structure fatigue growth of surface cracks |
| CN210953627U (en) * | 2019-10-28 | 2020-07-07 | 长安大学 | Camera adjusting device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929146A (en) * | 2020-06-18 | 2020-11-13 | 广东石油化工学院 | A observation device for metal material fatigue crack propagation |
| CN111929146B (en) * | 2020-06-18 | 2023-06-13 | 广东石油化工学院 | Observing device for fatigue crack growth of metal material |
| CN114088515A (en) * | 2021-11-02 | 2022-02-25 | 国家高速列车青岛技术创新中心 | Monocular vision multi-view crack propagation monitoring device |
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