Video extensometer calibration tool
By designing a video extensometer calibration tool for the video extensometer including columns, adapter plates, fine-tuning slide tables and damping hinges, the problem of inconvenient calibration and low accuracy in the prior art is solved, and a fast and accurate calibration process is achieved.
Patent Information
- Application Number
- CN202421227868.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The lack of tooling for maintaining a constant object distance in the prior art leads to inconvenient calibration of video extensometers and affects accuracy.
A video extensometer calibration tooling is designed, including columns, rectangular adapter plates, fine-tuning slide tables and damping hinges. The precise adjustment of the specimen position is achieved through the combination of fine-tuning slide tables and damping hinges.
The tooling can quickly and accurately position the specimen, improving the calibration efficiency and accuracy of the video extensometer.
Smart Images
Figure CN222965026U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of optical cable test and detection, in particular to a calibration tool for a video extensometer. Background Technique
[0002] In the extensibility test of optical cables, a video extensometer is often used. The principle of the video extensometer is to optically track the marked points, lines or texture features on the specimen, and determine the deformation amount of the specimen through the displacement change of the marked points, lines or texture features. As Figure 1 shown, the video extensometer uses an industrial camera to take pictures of the object to be measured in real time, and through a dedicated data analysis software, compares and analyzes the pictures collected by the camera and performs analog-to-digital conversion to obtain the deformation amount required for the tensile test. There is such a physical phenomenon in the video extensometer: for the imaging of an object with the same length L0 at different object distances under the same camera, the larger the object distance u, the smaller the physical pixels of the object in the picture taken by the camera. Therefore, when the video extensometer and the test equipment keep their physical positions unchanged, when actually measuring specimens of different specifications (different diameters or different thicknesses), it is equivalent to a change in the object distance u; therefore, in actual applications, when the object distance of the same gauge length L0 changes within a certain range, the error between the gauge length measured by the video extensometer and the actual gauge length L0 should meet the metrological regulations of the extensometer. To sum up, to ensure the measurement accuracy of the video extensometer, the video extensometer is calibrated using a specific data analysis software. During calibration, specimens of two extreme sizes (the smallest diameter and the largest diameter) need to be photographed at the same object distance, and then the analysis software analyzes and calibrates based on the pictures of the two specimens under the extreme sizes. In the prior art, there is no tooling for keeping the object distance constant during the two shootings, which is inconvenient for calibration and affects the calibration accuracy. Content of the Utility Model
[0003] The purpose of the utility model is to provide a calibration tool for a video extensometer to solve the problems raised in the above background technique.
[0004] To achieve the above purpose, the utility model provides the following technical solution: A calibration tool for a video extensometer, including a column a and a rectangular adapter plate. The adapter plate is installed on the front side of the column a. A fine-tuning slide table is installed on the outer side of the adapter plate. A damping hinge has a hinge leaf extending out of the fine-tuning slide table. One side of the fine-tuning slide table is installed with a column b through a damping hinge. A rectangular identification plate is installed on the outer side of the column b. The position of the identification plate relative to the adapter plate can be finely adjusted through the fine-tuning slide table. The identification plate is perpendicular to one hinge leaf of the damping hinge. The column a and the column b are made of aluminum profiles with a square cross-section. Magnet suction cups a are installed at the upper and lower ends of the column a on the side where the adapter plate is located.
[0005] Preferably, rectangular long holes are respectively arranged on the upper and lower sides of the adapter plate, and a limit screw is screwed on the front side of the column a, and the limit screw penetrates through the long hole and is screwed with it.
[0006] Preferably, the length of the column a is greater than the length of the column b.
[0007] Compared with the prior art, the beneficial effects of the present utility model are as follows: This calibration tooling is used for positioning the specimen photographing under two limit dimensions, facilitating rapid photographing and calibrating the video extensometer, which is beneficial to improving efficiency. The fine-tuning slide table can precisely adjust the position of the specimen, which is beneficial to improving the calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is a schematic diagram for introducing the calibration of the video extensometer;
[0009] Figure 2 It is a front view structural schematic diagram of the present utility model;
[0010] Figure 3 It is a top view structural schematic diagram of the present utility model;
[0011] Figure 4 It is a side view structural schematic diagram of the present utility model;
[0012] Figure 5 It is an installation schematic diagram of this calibration tooling and the traction fixture;
[0013] Figure 6 For Figure 5 The sectional view structural schematic diagram at the A-A direction in
[0014] In the figure: 1. Column a; 2. Adapter plate; 3. Fine-tuning slide table; 4. Magnet chuck a; 5. Limit screw; 6. Damping hinge; 7. Column b; 8. Identification plate; 9. Traction fixture; 10. Alignment baffle. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.
[0016] Please refer to Figures 2 - 6, the present utility model provides a technical solution: a video extensometer calibration tooling, including a column a1 and a rectangular adapter plate 2. The adapter plate 2 is installed on the front side of the column a1. A fine adjustment slide table 3 is installed on the outer side of the adapter plate 2. One hinge of a damping hinge 6 extends out of the fine adjustment slide table 3. A column b7 is installed on one side of the fine adjustment slide table 3 through the damping hinge 6. A rectangular identification plate 8 is installed on the outer side of the column b7. The length of the column a1 is greater than that of the column b7. The position of the identification plate 8 relative to the adapter plate 2 can be finely adjusted through the fine adjustment slide table 3.
[0017] The identification plate 8 is perpendicular to one hinge of the damping hinge 6. The column a1 and the column b7 are made of aluminum profiles with a square cross-section. Magnet suction cups a4 are installed on the upper and lower ends of the column a1 on the side where the adapter plate 2 is located. The magnet suction cups a4 are used to adsorb and fix this tooling. Rectangular long holes are respectively provided on the upper and lower sides of the adapter plate 2. A limit screw 5 is screwed on the front side of the column a1. The limit screw 5 passes through the long hole and is screwed with it. After loosening the limit screw 5, the position of the adapter plate 2 can be adjusted within a large range.
[0018] When in use, place this calibration tooling between Figure 5 the shown traction clamps 9. The magnet suction cups a4 at the upper and lower ends of the column a1 are adsorbed on the jaws. A horizontal alignment baffle 10 is installed on the end face of the traction clamp 9 by means of magnetic attraction. During calibration, the identification plate 8 is attached to the alignment baffle 10. The specimen ( Figure 6 at the position shown as M in the figure) is aligned with the identification plate 8, and then photographed by the video extensometer. When replacing specimens with two extreme sizes, the identification plate 8 is adjusted to move ΔD / 2 along the direction of the video extensometer through the fine adjustment slide table 3. ΔD represents the diameter difference between the largest diameter optical cable and the smallest diameter specimen. The processing idea of this calibration tooling is to adjust the position of the specimen through the identification plate 8, and compensate for the object distance through the change of the specimen position, so as to make the object distances of the two measurements equal.
[0019] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A video extensometer calibration tool, comprising a column a (1) and a rectangular adapter plate (2), characterized in that: The adapter plate (2) is installed on the front side of the column a (1), a fine-tuning slide (3) is installed on the outer side of the adapter plate (2), a hinge of the damping hinge (6) extends out of the fine-tuning slide (3), a column b (7) is installed on one side of the fine-tuning slide (3) through the damping hinge (6), a rectangular identification plate (8) is installed on the outer side of the column b (7), the position of the identification plate (8) relative to the adapter plate (2) can be fine-tuned through the fine-tuning slide (3), the identification plate (8) is perpendicular to a hinge of the damping hinge (6), the column a (1) and the column b (7) are made of aluminum profiles with a square cross-section, and magnetic suction cups a (4) are installed at the upper and lower ends of the column a (1) on the side where the adapter plate (2) is located.
2. The video extensometer calibration tool according to claim 1, characterized in that: The upper and lower sides of the adapter plate (2) are respectively provided with rectangular long holes, and the front side of the column a (1) is screwed with a limit screw (5), and the limit screw (5) passes through the long hole and is screwed thereto.
3. The video extensometer calibration tool according to claim 1, characterized in that: The length of the column a (1) is greater than the length of the column b (7).