Strain gauge

Abstract

The utility model provides a strain gauge which comprises a flexible liquid storage pipe and a display pipe, the pipe diameter of the liquid storage pipe is four to twenty times of the pipe diameter of the display pipe, and the liquid storage pipe and the display pipe are filled with display liquid, so that when a component to be detected is tensioned, the component to be detected can be detected at the same time; during detection, the two ends of the liquid storage pipe are fixed with the to-be-detected component, then tensioning force is applied to the to-be-detected component, the liquid storage pipe is tensioned along with the to-be-detected component at the moment, the liquid storage pipe is lengthened, the cross section of the liquid storage pipe is not changed, the volume of the whole liquid storage pipe is increased due to the lengthening of the liquid storage pipe, and the pressure intensity is changed due to the increase; therefore, the change of the volume of the liquid storage pipe can be calculated by observing the variable quantity of the liquid in the display pipe through the measurement of a ruler, then the stretching length of the liquid storage pipe along with the to-be-detected component can be calculated, and the dependent variable of the to-be-detected component in the stretching process can be estimated.

Description

Technical Field

[0001] The utility model relates to the field of observation tools, in particular to an observation tool for observing the deformation of a component when it is subjected to force, and particularly to a strain gauge. Background Art

[0002] The current method used for prestressed stress testing is to use a standard jack to perform secondary tensioning on the tensioned component to be tested, that is, when the clip and the separation anchor ring cause the elongation of the component to be tested to change, the jack pressure gauge reading is read.

[0003] However, this prestressed steel testing method obtains test data by performing a secondary tensioning on the component to be tested. If the test fails, the component to be tested must be re-tensioned and re-tested. However, secondary and quadruple tensioning significantly affects the physical properties and service life of the component to be tested. Furthermore, the friction between the clip and the anchor ring can cause significant deviations in the test results.

[0004] Therefore, there is an urgent need for a strain gauge for stress detection that has a simple structure, is easy to observe, and does not damage the component to be detected. Utility Model Content

[0005] In view of the above problems, the purpose of this utility model is to provide a strain gauge to solve the problem that the existing prestressed steel testing method obtains test data by performing a second tensioning on the tested component. If the test fails, the tested component needs to be re-tensioned and re-tested. However, the second and fourth tensioning processes have a significant impact on the physical properties and service life of the tested component. In addition, the friction between the clip and the anchor ring may cause significant deviations in the test results.

[0006] The utility model provides a strain gauge, which is fixed on a component to be detected for stress detection, and comprises a housing and a tube body arranged inside the housing; wherein,

[0007] The tube body includes a flexible liquid storage tube and a display tube;

[0008] A through hole is provided at the lower portion of the side wall of the liquid storage tube, and the display tube is connected and fixed to the through hole;

[0009] The liquid storage tube and the display tube are filled with display liquid.

[0010] Preferably, the diameter of the liquid storage tube is four to twenty times the diameter of the display tube;

[0011] Scales are marked on the display tube.

[0012] Preferably, the housing is a flexible housing;

[0013] The two ends of the liquid storage tube are fixed to the two ends of the flexible shell; and the flexible shell can be fixed on the component to be detected.

[0014] Preferably, the housing is a spring housing;

[0015] The two ends of the liquid storage tube are fixed to the two ends of the spring housing, and the spring housing can be fixed on the component to be detected.

[0016] Preferably, the tube bodies of the liquid storage tube and the display tube are transparent TPE tube bodies.

[0017] Preferably, the liquid storage tube and the display tube are an integrally formed structure.

[0018] Preferably, the liquid storage tube comprises an outer tube and a support ring plugged in the liquid storage tube;

[0019] The support rings are arranged on the inner wall of the outer tube at equal intervals and are fitted and fixed to the outer tube.

[0020] Preferably, the display liquid is a bright blue liquid or a bright red liquid.

[0021] Preferably, the diameter of the liquid storage tube is 2-3 mm.

[0022] Preferably, the diameter of the display tube is 0.2-0.5 mm.

[0023] As can be seen from the above technical solution, the strain gauge provided by the present invention is fixed on the component to be detected for stress detection, and includes a shell and a tube body arranged inside the shell; wherein the tube body includes a flexible liquid storage tube and a display tube, the diameter of the liquid storage tube is four to twenty times the diameter of the display tube, a through hole is provided at the lower part of the side wall of the liquid storage tube, the display tube is connected and fixed on the through hole, and the liquid storage tube and the display tube are filled with display liquid, so that when the component to be detected is tensioned, the component to be detected can be detected at the same time, and it is only necessary to fix the two ends of the liquid storage tube in the strain gauge to the component to be detected, and then the component to be detected is fixed. When a tensile force is applied to the component, the liquid storage tube is stretched or compressed along with the component to be detected, causing the liquid storage tube to grow or shrink, and the cross-section remains unchanged. At this time, the volume of the entire liquid storage tube increases due to the growth of the liquid storage tube, and the volume of the liquid storage tube decreases due to the shortening of the liquid storage tube. The increase or decrease causes a change in pressure, and the display liquid in the display tube flows into or out of the liquid storage tube. In this way, the change in the volume of the liquid storage tube can be calculated by observing the change in the amount of liquid in the display tube, and then the length of the liquid storage tube as the component to be detected is stretched or shortened can be calculated, so that the strain of the component to be detected during the tensioning process can be estimated. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand. In the accompanying drawings:

[0025] Figure 1 is a schematic diagram of a strain gauge according to an embodiment of the present invention;

[0026] Among them, the accompanying drawings are marked as follows: 1. shell; 2. liquid storage tube; 3. display tube. DETAILED DESCRIPTION

[0027] The existing prestressing testing method obtains test data by performing a secondary tensioning on the component to be tested. If the test fails, the component to be tested must undergo additional tensioning and re-testing. However, secondary and quaternary tensioning significantly affects the physical properties and service life of the component to be tested. Furthermore, friction between the clip and the anchor ring can significantly deviate from the test results.

[0028] In order to solve the above problems, the present invention provides a strain gauge. The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] In order to illustrate the strain gauge provided by the utility model, Figure 1 The embodiments of the present invention are exemplarily indicated.

[0030] The following description of exemplary embodiments is merely illustrative and is not intended to limit the present invention and its application or use. Technologies and devices known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0031] like Figure 1As shown, the utility model provides a strain gauge fixed on a component to be detected for stress detection, comprising a housing 1 and a tube body arranged inside the housing; wherein the tube body comprises a flexible liquid storage tube 2 and a display tube 3; the diameter of the liquid storage tube 2 is four to twenty times the diameter of the display tube; a through hole is provided at the lower part of the side wall of the liquid storage tube, the display tube is connected and fixed to the through hole, and the liquid storage tube and the display tube are filled with display liquid, so that when the component to be detected is tensioned, the component to be detected can be detected at the same time, by simply fixing the two ends of the liquid storage tube to the component to be detected. The length of the liquid storage tube stretched along with the component to be detected is then applied, causing the tube to grow while its cross section remains unchanged. As the tube grows, the volume of the entire tube increases, and the pressure changes due to the increase, causing the display liquid in the display tube to flow into the tube. By measuring the change in the liquid in the display tube with a ruler, the change in the volume of the tube can be calculated, and then the length of the tube stretched along with the component to be detected can be calculated, thereby estimating the strain of the component to be detected during the stretching process.

[0032] In this embodiment, a scale is marked on the display tube so that the change in the amount of liquid in the display tube during the process of tensioning the component to be detected can be more clearly and concisely seen.

[0033] There is no specific limitation on the specific materials and fixing methods of the housing, liquid storage tube and display tube, as long as they can meet the above functions.

[0034] In a specific embodiment, the shell 1 is a flexible shell, and the two ends of the liquid storage tube are fixed to the two ends of the flexible shell; and the flexible shell can be fixed on the component to be detected, so as to apply a tensile force to the component to be detected. At this time, the flexible shell drives the liquid storage tube to be stretched together with the component to be detected, so that the liquid storage tube grows or shortens, and the cross-section remains unchanged. At this time, the volume of the entire liquid storage tube will increase due to the growth of the liquid storage tube, and the volume of the liquid storage tube will decrease due to the shortening of the liquid storage tube. The increase or decrease causes the pressure to change, and then the display liquid in the display tube will flow into or out of the liquid storage tube. In this way, the change in the volume of the liquid storage tube can be calculated by observing the change in the amount of liquid in the display tube, and then the length of the liquid storage tube stretched or shortened along with the component to be detected can be calculated, so that the strain of the component to be detected during the tensioning process can be estimated.

[0035] In another specific embodiment, the housing 1 is a spring housing, and the two ends of the liquid storage tube are fixed to the two ends of the spring housing, and the spring housing can be fixed on the component to be detected, so that the housing plays a role of limiting the liquid storage tube. When a tensile force is applied to the component to be detected, the liquid storage tube and the spring are stretched together with the component to be detected, so that the liquid storage tube grows and the cross-section remains unchanged.

[0036] The material of the liquid storage tube and the display tube can be any flexible material, which can be TPE material, PVC material, or plastic material. In this embodiment, the tube body of the liquid storage tube and the display tube is a transparent TPE tube body, which ensures flexibility while having a certain degree of rigidity, thereby minimizing the reduction of the cross-sectional area during the deformation process. The use of a transparent material facilitates the observation of changes in the display liquid. In this embodiment, the display liquid is a bright blue liquid or a bright red liquid, so that the naked eye can more clearly see the change in the liquid in the display tube, and then more accurately calculate the strain of the component to be detected during the tensioning process.

[0037] In this embodiment, the liquid storage tube and display tube are integrally formed to enhance airtightness. The liquid storage tube comprises an outer tube and a support ring inserted within the tube. The support ring is evenly spaced and securely attached to the inner wall of the outer tube, further preventing the cross-sectional area of the liquid storage tube from shrinking as the component to be inspected deforms.

[0038] The component to be detected can be any component that requires strain force detection, such as a steel strand. In a more specific embodiment, the component to be detected is a steel strand. Then, in the matching strain gauge, the diameter of the liquid storage tube is 2-3 mm, the diameter of the display tube is 0.2-0.5 mm, the length of the liquid storage tube can be one centimeter, and the length of the display tube can be determined according to the situation. In this embodiment, it is also 1 cm. Therefore, during use, when the steel strand is intended to be tensioned, the specific 2-3 mm diameter liquid storage tube in this embodiment is fixed to the steel strand based on the outer shell. When the steel strand is pulled / compressed, the liquid storage tube will extend or shorten accordingly. The change in the liquid storage tube may not be visible to the naked eye, but when viewed on the extremely thin display tube, the change in the volume of the liquid storage tube causes the position of the display liquid in the display tube to change, thereby measuring the strain change of the steel strand.

[0039] As described above, the strain gauge provided in this embodiment includes a housing 1 and a tube body arranged inside the housing; wherein the tube body includes a flexible liquid storage tube 2 and a display tube 3; the diameter of the liquid storage tube 2 is four to twenty times the diameter of the display tube; a through hole is provided at the lower part of the side wall of the liquid storage tube, and the display tube is connected and fixed to the through hole, and the liquid storage tube and the display tube are filled with display liquid, so that when the component to be detected is stretched, the component to be detected can be detected at the same time, by simply fixing the two ends of the liquid storage tube to the component to be detected, and then When a tensile force is applied to the component, the liquid storage tube is stretched along with the component to be detected, causing the liquid storage tube to grow while the cross-section remains unchanged. At this time, the growth of the liquid storage tube will increase the volume of the entire liquid storage tube, and the increase will cause a change in pressure, so that the display liquid in the display tube will flow into the liquid storage tube. By measuring with a ruler, the change in the amount of liquid in the display tube can be observed to calculate the change in the volume of the liquid storage tube, and then the length of the liquid storage tube as the component to be detected is calculated, so that the strain of the component to be detected during the tensioning process can be estimated.

[0040] The strain gauge according to the present invention has been described above by way of example with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications may be made to the strain gauge described above without departing from the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A strain gauge fixed on a component to be tested for stress detection, characterized in that: It comprises a shell and a tube body arranged inside the shell; wherein, The tube body includes a flexible liquid storage tube and a display tube; A through hole is provided at the lower portion of the side wall of the liquid storage tube, and the display tube is connected and fixed to the through hole; The liquid storage tube and the display tube are filled with display liquid.

2. The strain gauge according to claim 1, wherein The diameter of the liquid storage tube is four to twenty times the diameter of the display tube; Scales are marked on the display tube.

3. The strain gauge according to claim 2, wherein The shell is a flexible shell; The two ends of the liquid storage tube are fixed to the two ends of the flexible shell; and the flexible shell can be fixed on the component to be detected.

4. The strain gauge according to claim 2, wherein The housing is a spring housing; The two ends of the liquid storage tube are fixed to the two ends of the spring housing, and the spring housing can be fixed on the component to be detected.

5. The strain gauge according to claim 2, wherein The tube bodies of the liquid storage tube and the display tube are transparent TPE tube bodies.

6. The strain gauge according to claim 5, wherein The liquid storage tube and the display tube are an integrally formed structure.

7. The strain gauge according to claim 6, wherein The liquid storage tube includes an outer tube and a support ring plugged in the liquid storage tube; The support rings are arranged on the inner wall of the outer tube at equal intervals and are fitted and fixed to the outer tube.

8. The strain gauge according to claim 7, wherein The display liquid is a bright blue liquid or a bright red liquid.

9. The strain gauge according to claim 8, wherein The diameter of the liquid storage tube is 2-3 mm.

10. The strain gauge according to claim 9, wherein The diameter of the display tube is 0.2-0.5 mm.

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