CN215677527U - Nondestructive testing device for strain state of part of spacer system - Google Patents
Nondestructive testing device for strain state of part of spacer system Download PDFInfo
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- CN215677527U CN215677527U CN202121909692.3U CN202121909692U CN215677527U CN 215677527 U CN215677527 U CN 215677527U CN 202121909692 U CN202121909692 U CN 202121909692U CN 215677527 U CN215677527 U CN 215677527U
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Abstract
The utility model discloses a nondestructive testing device for the strain state of a part of a spacer system, which comprises centripetal force loading equipment, a plurality of camera sets and an image data processing computer, wherein the camera sets are fixed with a frame or a wire clamp of a spacer through a fixed support, the field of view of each camera set points to different two-dimensional or three-dimensional fields of the detected area of the spacer, the centripetal force loading equipment acts on the detected area of the spacer, a first camera and a second camera are arranged in each camera set, and a certain angle is formed between the central axes of the first camera and the second camera; each camera group is connected with an image data processing computer. The utility model innovates the shooting angle, adopts a two-dimensional and three-dimensional photogrammetry method, namely, the camera set is arranged at the shooting visual angles of different two-dimensional or three-dimensional visual fields of the detected area of the spacer, thereby realizing the purpose of directly detecting complex parts without damage.
Description
Technical Field
The utility model relates to the technical field of spacers, in particular to a nondestructive testing device for strain states of parts of a spacer system.
Background
In order to control the spacing between the split conductors to prevent the conductors from whiplash with each other, to suppress breeze vibration and subspan vibration, spacers are mounted on the multi-split conductors. The main structural components of the spacer comprise a frame and a wire clamp bracket connected to the frame.
In order to detect the actual safe load bearing of the spacer system, the spacer system is generally tested by centripetal force loading equipment, and the test method is characterized in that sliders arranged on two sides of a frame act on the spacer and the frame at the same time, and under the applied centripetal force load, the maximum load of the frame and a spacer bracket before failure is detected, so that the overall mechanical property of the spacer system is judged.
Then, when the spacer performs mechanical property, the conventional detection method is to stick a strain gauge on the spacer for detection, so that due to the characteristics of the strain gauge, a tensile test piece with enough diameter and enough wire length of the tensile test bar must be cut and taken out from a spacer frame, but because the frame is a thin-wall cast part, a standard test sample cannot be cut and taken out. And the wire clamp of the spacer is a complex curved surface structure, and a tensile test piece with enough diameter and enough wire length cannot be cut out. Therefore, the conventional detection method adopts an indirect detection mode instead of a direct detection mode, namely the detection of the spacer rod part is to carry out the mechanical property test on a tensile test rod which is made of the same material and is cast by the same process so as to replace the direct sampling test of the part. Obviously, such an approximation method does not take into account that the complexity of forming the part is much higher than the formability of the test piece, and therefore the test characteristics of the standard cast test piece do not include the process characteristic differences of the part and the resulting performance differences.
If the mode of direct detection is adopted, the structure of the spacer is complex, the result detected by the mode of directly sticking the strain gauge is very inaccurate, the accuracy is low, the mode is very complicated to operate, the cost of manpower and material resources is high, the spacer is easy to damage, the detection precision can be greatly reduced by adopting the indirect detection mode, and the method and the device which are low in cost, nondestructive, simple and convenient and high in detection precision can be used for directly detecting the spacer quickly and effectively.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a nondestructive testing device for the strain state of parts of a spacer system, which has the advantages of low cost, no damage, simplicity and convenience, high testing precision and capability of directly and quickly testing spacers with complex structures.
In order to achieve the purpose, the utility model provides the following technical scheme: a nondestructive testing device for the strain state of a part of a spacer system comprises centripetal force loading equipment, a plurality of camera sets and an image data processing computer, wherein the camera sets are fixed with a frame or a wire clamp of a spacer through a fixing support, the view field of each camera set points to different two-dimensional or three-dimensional view fields of a tested area of the spacer, the centripetal force loading equipment acts on the tested area of the spacer, a first camera and a second camera are arranged in each camera set, and a certain angle is formed between the central axes of the first camera and the second camera; each camera group is connected with an image data processing computer.
Preferably, the fixed support adopts a support which can be lifted, disassembled and adjusted in angle.
Preferably, the first camera is fixed on the first fixing rod, the second camera is fixed on the second fixing rod, and a certain included angle is formed between the first fixing rod and the second fixing rod.
Preferably, the different three-dimensional fields of view of the detected area at least include a front field of view of the detected area, a left field of view of the detected area, a right field of view of the detected area, an upper field of view of the detected area, and a lower field of view of the detected area.
Preferably, the spacer is painted in a layer of paint on the area to be inspected.
Compared with the prior art, the utility model has the beneficial effects that:
1. the nondestructive testing device for the strain state of the part of the spacer system is a photogrammetric device adopting nondestructive and direct testing, and for a frame with a more complex structure of the spacer and a wire clamp with a complex curved surface structure, the utility model innovates the shooting angle of the spacer system, and adopts a two-dimensional and three-dimensional photogrammetric method, namely, a camera set is arranged at the shooting visual angles of different two-dimensional or three-dimensional visual fields of the tested area of the spacer to obtain the static or dynamic strain image information of the different two-dimensional or three-dimensional visual fields of the tested area of the spacer, thereby realizing the purpose of directly and nondestructively and directly testing the complex part.
2. The fixed support adopts the support which can be lifted, disassembled and adjusted in angle, can adjust the direction and the angle of the camera set, is convenient to install and disassemble, can install the camera set at any angle of the spacer rod through the fixed support so as to detect the whole or any local part of the spacer rod, has a very wide application range and is very convenient to use.
3. According to the utility model, the central axes of the first camera and the second camera form a certain angle through the first fixing rod and the second fixing rod, so that a three-dimensional image of a detected area with the same three-dimensional field of view is conveniently constructed, the detection precision is improved, and parts with complex structures can be detected.
4. The nondestructive testing device for the strain state of the part of the spacer system has the advantages of low cost, no damage, simplicity and convenience and high testing precision, can be used for directly testing the spacer rapidly and effectively, and can obtain the maximum stress through stress-strain conversion calculation so as to check the allowable stress and safety of parts.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of a test principle of a centripetal force loading apparatus;
FIG. 2 is a schematic block diagram of the non-destructive testing apparatus for the strain status of the components of the spacer system of the present invention;
fig. 3 is a schematic view of the installation of the camera group according to the present invention.
In the figure: 1. a spacer; 11. a frame; 12. wire clamps; 2. a camera set; 21. a first camera; 22. a second camera; 23. fixing a bracket; 24. a first fixing lever; 25. a second fixing bar; 3. a centripetal force loading device; 4. an image data processing computer;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The centripetal force loading device is a conventional device for detecting the actual safe load bearing of the spacer system, the sliders arranged on two sides of the spacer as shown in fig. 1 act on the spacer, the centripetal force load can be applied to the spacer, then the maximum load of the spacer before failure is detected through the detection device, so that the overall mechanical property of the spacer system is judged, and the centripetal force borne by the spacer can be calculated and obtained by applying a pulling force T and a wire angle theta to the spacer.
As shown in fig. 2-3, the present invention provides a nondestructive testing device for the strain state of a component of a spacer system, which comprises a centripetal force loading device 3, a plurality of camera sets 2 and an image data processing computer 4, wherein the plurality of camera sets 2 are fixed with a frame 11 or a wire clamp 12 of the spacer 1 through a fixing bracket 23, the field of view of each camera set 2 points to different two-dimensional or three-dimensional fields of view of a tested area of the spacer 1, the centripetal force loading device 3 acts on the tested area of the spacer 1, a first camera 21 and a second camera 22 are arranged in each camera set 2, a certain angle is arranged between the central axes of the first camera 21 and the second camera 22, the method aims to utilize cameras with different angles to shoot the field of view in the same three-dimensional direction, so that a three-dimensional image of a detected area with the field of view in the same three-dimensional direction can be conveniently constructed, and the detection precision is improved; each camera group 2 is connected to the image data processing computer 4, and the first camera 21 and the second camera 22 may be industrial cameras. The different three-dimensional visual fields of the detected area at least comprise a front visual field of the detected area, a left visual field of the detected area, a right visual field of the detected area, an upper visual field of the detected area and a lower visual field of the detected area.
The whole operation steps are as follows:
1) a layer of thin spraying paint is coated on a detected area of the spacer, and random speckles are generated by spraying the paint so as to enhance the surface characteristics of a detected object;
2) each camera set 2 collects three-dimensional images of the detected area of the spacer through two cameras with different angles, and shoots the surface characteristics of the detected area of the spacer before and after deformation;
3) after receiving image data collected by the camera set 2 with different three-dimensional fields of view in the detected area from the spacer 1, the image data processing computer 4 uses the digital image correlation method principle (DIC) to obtain displacement, strain and deformation information of the surface of the detected object from the shot images of the detected area of the spacer in different directions before and after loading by using a software program and adopting a related algorithm, compares the position change of image speckles before and after loading and tracks the movement of the positions of the speckles to calculate the static or dynamic strain of the surface of the detected area of the spacer, thereby directly obtaining the load characteristics borne by the spacer system on an experimental table or under the real working condition on site. The data from such testing may be used to characterize the spacer tissue material and forming process to optimize the effective basis for the part construction.
A digital image correlation method (also called digital speckle correlation DIC), which is a method for obtaining deformation information of an area of interest by correlating two digital images before and after deformation of a test piece. The basic principle is to grid the region of interest in the pre-deformation image, and treat each sub-region as rigid motion. And then, for each sub-region, performing correlation calculation according to a predefined correlation function by a certain search method, and searching a region with the maximum cross-correlation coefficient with the sub-region in the deformed image, namely the position of the sub-region after deformation, so as to obtain the displacement of the sub-region. And calculating all the sub-regions to obtain the deformation information of the whole field. The method has very loose requirements on experimental environment, and has the advantages of full-field measurement, strong anti-interference capability, high measurement precision and the like.
In another embodiment of the present invention, in order to adjust the direction and angle of the camera set, the fixing bracket 23 is a bracket capable of being lifted, detached and adjusted in angle. The camera group 2 can be arranged at any angle of the spacing rod through the fixed support, so that the whole or any part of the spacing rod can be detected.
The first camera 21 is fixed on the first fixing rod 24, the second camera 22 is fixed on the second fixing rod 25, and a certain included angle is formed between the first fixing rod 24 and the second fixing rod 25.
The nondestructive testing device for the strain state of the part of the spacer system is a photogrammetric device adopting nondestructive and direct testing, and for a frame with a more complex structure of the spacer and a wire clamp with a complex curved surface structure, the utility model innovates the shooting angle of the spacer system, and adopts a two-dimensional and three-dimensional photogrammetric method, namely, a camera set 2 is arranged at the shooting visual angles of different two-dimensional or three-dimensional visual fields of the tested area of the spacer 1 to obtain the static or dynamic strain image information of the different two-dimensional or three-dimensional visual fields of the tested area of the spacer 1, thereby realizing the purpose of directly and directly testing the complex part without damage.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A nondestructive testing device for the strain state of a part of a spacer system comprises a centripetal force loading device, and is characterized in that: the centripetal force loading equipment acts on the detected area of the spacer, a first camera and a second camera are arranged in each camera set, and a certain angle is formed between the central axes of the first camera and the second camera; each camera group is connected with an image data processing computer.
2. The apparatus for non-destructive testing of the strain state of components of a spacer system according to claim 1, wherein: the fixed support adopts the support that can go up and down, can dismantle, adjustable angle.
3. The apparatus for non-destructive testing of the strain state of components of a spacer system according to claim 1, wherein: the first camera is fixed on the first fixing rod, the second camera is fixed on the second fixing rod, and a certain included angle is formed between the first fixing rod and the second fixing rod.
4. The apparatus for non-destructive testing of the strain state of components of a spacer system according to claim 1, wherein: the different three-dimensional visual fields of the detected area at least comprise a front visual field of the detected area, a left visual field of the detected area, a right visual field of the detected area, an upper visual field of the detected area and a lower visual field of the detected area.
5. The apparatus for non-destructive testing of the strain state of components of a spacer system according to claim 1, wherein: the detected area of the spacer is coated with a layer of sprayed paint.
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| CN202121909692.3U CN215677527U (en) | 2021-08-15 | 2021-08-15 | Nondestructive testing device for strain state of part of spacer system |
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| CN202121909692.3U CN215677527U (en) | 2021-08-15 | 2021-08-15 | Nondestructive testing device for strain state of part of spacer system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117491167A (en) * | 2023-11-03 | 2024-02-02 | 中国电建集团河南电力器材有限公司 | Spacer centripetal force test detection equipment and application method |
| CN118376507A (en) * | 2024-06-26 | 2024-07-23 | 火炬电气集团有限公司 | Spacer centripetal force test device and centripetal force and tension conversion calculation method |
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2021
- 2021-08-15 CN CN202121909692.3U patent/CN215677527U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117491167A (en) * | 2023-11-03 | 2024-02-02 | 中国电建集团河南电力器材有限公司 | Spacer centripetal force test detection equipment and application method |
| CN117491167B (en) * | 2023-11-03 | 2024-04-30 | 中国电建集团河南电力器材有限公司 | Spacer centripetal force test detection equipment and application method |
| CN118376507A (en) * | 2024-06-26 | 2024-07-23 | 火炬电气集团有限公司 | Spacer centripetal force test device and centripetal force and tension conversion calculation method |
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