Double-video extensometer device for automatically calculating percentage reduction of area of dumbbell-shaped round bar sample

Abstract

The utility model discloses a double-video extensometer device for automatically calculating the percentage reduction of area of a dumbbell-shaped round bar sample, and relates to the technical field of material testing devices. The device comprises a pneumatic shoulder clamp and two groups of video extensometer supports, the pneumatic shoulder clamp and the two groups of video extensometer supports are mounted on a tensile testing machine, a video extensometer and two light sources are mounted on each of the two groups of video extensometer supports, the two light sources are respectively positioned on two sides of the video extensometer, and the video extensometers on the two groups of video extensometer supports are arranged at an angle of 90 degrees. The device disclosed by the utility model has the beneficial effects that the reduction of area is automatically measured through the two video extensometers without manually splicing a sample and measuring the diameter of the sample, so that the process of a material tensile test is simplified, a large amount of test time is saved, and the accuracy and the reliability of a test result are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material testing devices, in particular to a dual-video extensometer device for automatically obtaining the cross-sectional shrinkage rate of a dumbbell-shaped round bar sample. Background Art

[0002] When studying the fully automatic tensile testing machine, in order to measure the cross-sectional shrinkage rate of the dumbbell-shaped round bar specimen, it is often necessary to measure the specimen diameter in advance, then re-splice the specimen after it breaks, and finally use a vernier caliper to manually measure the minimum diameter at the fracture position of the specimen to calculate the cross-sectional shrinkage rate. Not only is the operation difficult, it often requires two people to cooperate and spend a lot of time, and the accuracy of the results of manually splicing specimens and measuring elongation is not high. Utility Model Content

[0003] The purpose of the utility model is to provide a dual video extensometer device for automatically obtaining the cross-sectional shrinkage rate of a dumbbell-shaped round bar specimen in view of the shortcomings and defects in the prior art. The device automatically measures the cross-sectional shrinkage rate through two video extensometers, and no longer requires manual splicing of specimens and measurement of specimen diameters, thereby simplifying the material tensile test process, saving a lot of test time, and improving the accuracy and reliability of the test results.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a dual video extensometer device for automatically obtaining the cross-sectional shrinkage rate of a dumbbell-shaped round bar specimen, which includes a pneumatic shoulder clamp 3 and two sets of video extensometer brackets 4 installed on a tensile testing machine, wherein the two sets of video extensometer brackets 4 are each installed with a video extensometer 1 and two light sources 2, the two light sources 2 are respectively located on both sides of the video extensometer 1, and the video extensometers 1 on the two sets of video extensometer brackets 4 are arranged at 90°.

[0005] Furthermore, the video extensometer bracket 4 is provided with a light source support rod 4 - 1 for mounting and fixing the light source 2 and a video extensometer support rod 4 - 2 for mounting the video extensometer 1 .

[0006] Furthermore, the connection between the pneumatic shoulder clamp 3 and the dumbbell-shaped round bar specimen adopts a contoured design, and the specimen is clamped by air pressure.

[0007] Furthermore, the four light sources 2 are in the shape of long strips, and are arranged in groups of two on both sides of the video extensometer 1 .

[0008] Furthermore, the video extensometer bracket 4 can adjust the installation height and direction of the video extensometer 1 and the light source 2 .

[0009] After adopting the above technical scheme, the beneficial effects of the utility model are as follows: the device automatically measures the cross-sectional shrinkage rate through two video extensometers, and there is no need to manually splice the specimens and measure the specimen diameters, which simplifies the material tensile test process, saves a lot of test time, and improves the accuracy and reliability of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 yes Figure 1 The corresponding top view of the structure.

[0013] Explanation of the accompanying reference numerals: video extensometer 1, light source 2, pneumatic shoulder clamp 3, video extensometer bracket 4, light source support rod 4-1, video extensometer support rod 4-2. DETAILED DESCRIPTION

[0014] See also Figure 1-Figure 2 As shown, the technical solution adopted in this specific embodiment is: it includes a pneumatic shoulder clamp 3 and two sets of video extensometer brackets 4 installed on a tensile testing machine, and each of the two sets of video extensometer brackets 4 is installed with a video extensometer 1 and two light sources 2, the two light sources 2 are respectively located on both sides of the video extensometer 1, and the video extensometers 1 on the two sets of video extensometer brackets 4 are set at 90°.

[0015] Furthermore, the video extensometer bracket 4 is provided with a light source support rod 4 - 1 for mounting and fixing the light source 2 and a video extensometer support rod 4 - 2 for mounting the video extensometer 1 .

[0016] Furthermore, the connection between the pneumatic shoulder clamp 3 and the dumbbell-shaped round bar sample is designed in a contoured manner, and the sample is clamped by air pressure, so that the pneumatic shoulder clamp 3 can better and more stably clamp the dumbbell-shaped round bar sample.

[0017] Furthermore, the four light sources 2 are in the shape of long strips, and are arranged in groups of two on both sides of the video extensometer 1. The light sources 2 can evenly illuminate the parallel sections of the dumbbell-shaped round bar specimen and provide sufficient light.

[0018] Furthermore, the video extensometer bracket 4 can adjust the installation height and direction of the video extensometer 1 and the light source 2 .

[0019] Working principle of the utility model: In this embodiment, the dumbbell-shaped round bar sample is first placed in the pneumatic shoulder clamp 3 and clamped and fixed, and then the tensile testing machine drives the pneumatic shoulder clamp 3 to stretch the sample until it breaks. After the sample is clamped, the four light sources 2 are turned on, and the two video extensometers 1 begin to track the change in the sample diameter. After the sample breaks, the cross-sectional shrinkage of the sample is automatically calculated (the ratio of the maximum reduction in the cross-sectional area of ​​the sample after fracture (So-So) to the original cross-sectional area (So), expressed in %, ), wherein the clamp in this embodiment is not limited to the pneumatic shoulder clamp 3, and other types of clamps can be installed according to design requirements, and the shapes of the four light sources 2 are not limited to long strips, and light sources of other shapes that meet actual use requirements can also be used.

[0020] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A dual-video extensometer device for automatically obtaining the cross-sectional shrinkage of dumbbell-shaped round bar specimens, characterized in that: The invention comprises a pneumatic shoulder clamp (3) installed on a tensile testing machine and two sets of video extensometer brackets (4), wherein each of the two sets of video extensometer brackets (4) is equipped with a video extensometer (1) and two light sources (2), the two light sources (2) are respectively located on both sides of the video extensometer (1), and the video extensometers (1) on the two sets of video extensometer brackets (4) are arranged at 90 degrees to each other.

2. The dual-video extensometer device for automatically obtaining the cross-sectional shrinkage of dumbbell-shaped round bar specimens according to claim 1 is characterized in that: The video extensometer bracket (4) is provided with a light source support rod (4-1) for installing and fixing the light source (2) and a video extensometer support rod (4-2) for installing the video extensometer (1).

3. The dual-video extensometer device for automatically obtaining the cross-sectional shrinkage of dumbbell-shaped round bar specimens according to claim 1 is characterized in that: The connection between the pneumatic shoulder clamp (3) and the dumbbell-shaped round bar sample is designed in a contour-like manner, and the sample is clamped by air pressure.

4. The dual-video extensometer device for automatically obtaining the cross-sectional shrinkage of dumbbell-shaped round bar specimens according to claim 1, characterized in that: The four light sources (2) are in the shape of long strips, and are arranged in groups of two on both sides of the video extensometer (1).

5. The dual-video extensometer device for automatically obtaining the cross-sectional shrinkage of dumbbell-shaped round bar specimens according to claim 1, characterized in that: The video extensometer bracket (4) can adjust the installation height and direction of the video extensometer (1) and the light source (2).

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