Device for quickly positioning object distance of video extensometer

Abstract

The utility model discloses an object distance rapid positioning device of a video extensometer, which comprises a bottom plate, two groups of screws a are mounted on the bottom plate along the length direction, each group of screws a is provided with a rotatable camera mounting plate, an industrial camera is correspondingly mounted on the camera mounting plate, a laser mounting plate is fixedly mounted on the bottom plate through screws b, and the laser mounting plate is fixedly mounted on the bottom plate through screws b. The laser mounting plate is provided with two symmetrical laser positioning assemblies, each laser positioning assembly comprises a U-shaped adjusting seat, each adjusting seat is provided with a left-right through circular jaw, a rotatable cylinder is mounted in each circular jaw, and a radial cross laser head is mounted on the outer side of each cylinder; and the cross light convergence point of the two cross laser heads coincides with the imaging intersection point of the two industrial cameras. The position of the emitted cross light coincides with the imaging intersection of the industrial cameras, the surface of the measurement area of the sample is arranged at the imaging intersection of the cameras, and the maximum overlapping area can be obtained in the visual fields of the two industrial cameras, so that the measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cable test and detection, in particular to a device for quickly positioning the object distance of a video extensometer. Background Technique

[0002] Currently, the commonly used extensometers include contact extensometers and non-contact extensometers. Among them, the non-contact extensometer generally obtains the deformation amount by comparing the images of the specimen before and after stretching through video shooting. The 3D video extensometer is composed of two or more industrial cameras arranged at a certain angle and simultaneously taking pictures of the specimen to be detected; and a professional analysis software is used to compare the same position of the specimen in the photos of each camera to obtain the accurate dimensions within the required measurement area. In order to ensure the accuracy of the video extensometer during the measurement process, it needs to be calibrated before use. Currently, the existing video extensometers have the problem of inconvenient and rapid positioning during calibration. Content of the Utility Model

[0003] The purpose of the utility model is to provide a device for quickly positioning the object distance of 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 device for quickly positioning the object distance of a video extensometer, including a bottom plate. The bottom plate is a rectangular rod-shaped structure. Two groups of screw a are installed along the length direction of the bottom plate. Each group of screw a is equipped with a rotatable camera mounting plate. An industrial camera is correspondingly installed on the camera mounting plate. The bottom plate is fixedly installed with a laser mounting plate through screw b. Two symmetrical laser positioning components are respectively installed on the laser mounting plate. The laser positioning component includes a U-shaped adjusting seat. The adjusting seat is provided with a circular jaw penetrating through left and right. A rotatable column body is installed in the circular jaw. A radial cross laser head is installed on the outer side of the column body. The cross light spot convergence point of the two cross laser heads coincides with the imaging convergence point of the two industrial cameras.

[0005] Preferably, the camera mounting plate is a rectangular plate structure and is provided with two symmetrical arc-shaped holes. The screw a penetrates through the arc-shaped holes and is slidably connected with them.

[0006] Preferably, the outer end of the circular jaw tightens the circular jaw through a bolt to clamp the column body.

[0007] Compared with the prior art, the beneficial effects of the utility model are: By making the position of the emitted cross light coincide with the imaging convergence point of the industrial camera, placing the surface of the measurement area of the specimen on the imaging convergence point of the camera, it is convenient and fast to carry out calibration and positioning. After calibration, it can ensure that the two industrial cameras can obtain the largest overlapping area in the field of view, thereby improving the measurement accuracy. Description of the Drawings

[0008] Figure 1 This is a schematic structural diagram of the present utility model;

[0009] Figure 2 This is a three-dimensional structural diagram of the laser positioning component of the present utility model.

[0010] In the figure: 1, bottom plate; 2, mounting plate; 3, industrial camera; 4, screw a; 5, laser mounting plate; 6, laser positioning component; 61, adjusting seat; 62, circular jaw; 63, cylinder; 64, bolt; 65, cross laser head; 7, arc-shaped hole. Detailed Implementation Manner

[0011] 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 the embodiments.

[0012] Please refer to Figure 1-2 , the present utility model provides a technical solution: a device for quickly positioning the object distance of a video extensometer, including a bottom plate 1. The bottom plate 1 is a rectangular rod-shaped structure. Along the length direction, two groups of screws a4 are installed on the bottom plate 1. Each group of screws a4 is provided with a rotatable camera mounting plate 2. An industrial camera 3 is correspondingly installed on the camera mounting plate 2. The camera mounting plate 2 is a rectangular plate structure and is provided with two symmetric arc-shaped holes 7. The screw a4 passes through the arc-shaped hole 7 and is slidably connected thereto. By flipping the camera mounting plate 2, the shooting angle of the lens of the industrial camera 3 can be freely adjusted.

[0013] The bottom plate 1 is fixedly installed with a laser mounting plate 5 through screws b. Two symmetric laser positioning components 6 are respectively installed on the laser mounting plate 5. The laser positioning component 6 includes a U-shaped adjusting seat 61. The adjusting seat 61 is fixed to the mounting plate 2 by screws. The adjusting seat 61 is provided with a circular jaw 62 penetrating left and right. The outer end of the circular jaw 62 tightens the circular jaw 62 through a bolt 64 to clamp the cylinder 63. A rotatable cylinder 63 is installed in the circular jaw 62. A radial cross laser head 65 is installed on the outer side of the cylinder 63. The cross laser head 65 can be rotated to adjust the angle. The cross light convergence points of the two cross laser heads 65 coincide with the imaging intersection points of the two industrial cameras 3. When calibrating, the calibrator of the extensometer is aligned with the coincidence point.

[0014] Working principle: Turn on two cross laser heads 65. By swinging the cross laser heads 65 to rotate the angle, the two cross laser lines emitted converge at a point on the outer surface of the specimen. Then, align the centers of the two industrial cameras 3 with the cross laser point. At this time, the intersection point of the two industrial cameras 3 coincides with the convergence point of the cross laser lines, achieving calibration and ensuring that the two industrial cameras 3 can obtain the largest overlapping area in the field of view.

[0015] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for quickly positioning the object distance of a video extensometer, including a bottom plate (1), the bottom plate (1) is a rectangular rod-shaped structure, and is characterized in that: The bottom plate (1) is provided with two groups of screw a (4) along the length direction, and each group of the screw a (4) is provided with a rotatable camera mounting plate (2). An industrial camera (3) is correspondingly mounted on the camera mounting plate (2). The bottom plate (1) is fixedly mounted with a laser mounting plate (5) through screw b. Two symmetric laser positioning components (6) are respectively mounted on the laser mounting plate (5). The laser positioning component (6) includes a U-shaped adjusting seat (61). The adjusting seat (61) is provided with a circular jaw (62) penetrating through left and right. A rotatable cylinder (63) is mounted in the circular jaw (62). A radial cross laser head (65) is mounted on the outer side of the cylinder (63). The cross light beam convergence points of the two cross laser heads (65) coincide with the imaging intersection points of the two industrial cameras (3).

2. The device for rapid positioning of the object distance of a video extensometer according to claim 1, characterized in that: The camera mounting plate (2) is of a rectangular plate structure and is provided with two symmetric arc-shaped holes (7) thereon. The screw a (4) penetrates through the arc-shaped hole (7) and is slidably connected thereto.

3. The device for rapid positioning of object distance of a video extensometer according to claim 2, characterized in that: The outer end of the circular jaw (62) is tightened by a bolt (64) to clamp the cylinder (63).

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