Steel strand extensometer device

Abstract

The utility model provides a steel strand extensometer device which comprises a shield, a strain elastic arm installed inside the shield, an electric bridge arranged on the upper portion of the strain elastic arm, an elastic sheet installed in the middle of the strain elastic arm, a first connecting rod and a second connecting rod installed on the end portion of the strain elastic arm, an upper supporting frame is installed at the end of the first connecting rod, an upper side fixing cutter is installed on the side face of the upper supporting frame, a lower supporting frame is installed at the end of the second connecting rod, and a distance limiting plate is installed in the middle of the first connecting rod and the middle of the second connecting rod. When the steel strand sample is subjected to different gravitational forces, the output voltage of the bridge also changes, the change condition of physical quantity in the environment is known by measuring the change of the output voltage, and the displacement and deformation data of the steel strand under different gravitational forces are obtained by carrying out an extension test on the steel strand sample, so that the reliability and the accuracy of measuring the infinitesimal displacement and deformation of the steel strand are verified.

Description

Technical Field

[0001] The utility model belongs to the field of steel strand extensometers, in particular to a steel strand extensometer device. Background Art

[0002] With the continuous development of modern engineering structures, the requirements for material performance are getting higher and higher. Steel strand, as an important building material, is a steel wire strand formed by twisting one or more groups of filaments. It has been widely used in various engineering fields. Due to the characteristics of the steel strand itself, it is difficult to accurately measure and monitor it. The steel strand extensometer device is used to effectively measure its tiny displacement and deformation. The extensometer is mainly used to measure the degree and amount of deformation of metal materials after being stressed. The elastic deformation characteristics of the material under stress are used to convert the degree of deformation into an electrical signal output, thereby calculating the deformation amount to measure the deformation amount and stress-strain relationship of the material under different loads. However, the existing extensometer device easily makes the deformation measurement affected by the structural characteristics of the steel strand, thereby reducing the accuracy of the steel strand measurement and failing to meet the actual needs of the project.

[0003] Therefore, in view of the shortcomings of the above-mentioned scheme in actual production and implementation, it is revised and improved. At the same time, in the spirit and concept of seeking excellence, with the assistance of professional knowledge and experience, and after many ingenuity and experiments, the utility model is created to provide a steel strand extensometer device to solve the problem. Utility Model Content

[0004] The utility model provides a steel strand extensometer device, which solves the problem that the extensometer device in the prior art easily makes the deformation measurement affected by the structural characteristics of the steel strand, thereby reducing the accuracy of steel strand measurement and failing to meet actual engineering needs.

[0005] The technical solution of the utility model is implemented as follows: a steel strand extensometer device comprises: a protective cover, a strain spring arm is installed inside the protective cover, an electric bridge is provided on the upper part of the strain spring arm, an elastic sheet is installed in the middle part of the strain spring arm, a first connecting rod and a second connecting rod are installed at the end of the strain spring arm, an upper support frame is installed at the end of the first connecting rod, an upper fixed knife is installed on the side of the upper support frame, a lower support frame is installed at the end of the second connecting rod, a lower fixed knife is installed on the side of the lower support frame, and a spacing limit plate is installed in the middle of the first connecting rod and the second connecting rod.

[0006] As a preferred implementation, a strain gauge is provided on the upper part of the strain elastic arm, and each strain elastic arm is provided with four strain gauges. The strain gauges can be installed on the upper part of the strain elastic arm respectively, and the deformation caused by the force on the object can be converted into an electrical signal.

[0007] As a preferred embodiment, the strain elastic arm is connected to the bridge, enabling the strain elastic arm to be connected to the bridge.

[0008] As a preferred embodiment, the upper fixed knife and the lower fixed knife are connected to the first connecting rod and the second connecting rod through rubber bands, and the use of rubber bands can improve the stability of the upper fixed knife and the lower fixed knife.

[0009] As a preferred embodiment, the upper part of the upper support frame and the lower support frame is provided with mounting pins, which facilitates the fixation of the upper support frame and the lower support frame.

[0010] As a preferred embodiment, the upper support frame and the lower support frame are fixedly connected to the first connecting rod and the second connecting rod, and the upper support frame and the lower support frame can be installed at the ends of the first connecting rod and the second connecting rod.

[0011] As a preferred embodiment, a limit plate mounting hole is provided in the upper part of the second connecting rod, which facilitates the installation of the spacing limit plate in the middle of the second connecting rod.

[0012] As a preferred embodiment, fixed mounting grooves are provided at the ends of the first connecting rod and the second connecting rod, and the use of the fixed mounting grooves facilitates the fixation of the first connecting rod and the second connecting rod.

[0013] After adopting the above technical solutions, the beneficial effects of the present utility model are as follows: The transmission of power can be realized through the strain elastic arm. Four strain gauges are respectively installed on the upper part of the strain elastic arm, which can convert the deformation caused by the force on the object into an electrical signal. Through the elastic sheet, the force directions of the resistors can be different, forming a full-bridge measurement circuit. The bridge can use the change in resistance value to measure the change in physical quantity. The upper support frame and the lower support frame are installed at the ends of the first connecting rod and the second connecting rod, and the use of the mounting pins can improve the stability of the upper support frame and the lower support frame. The use of rubber bands can improve the stability of the upper fixed knife and the lower fixed knife. When the resistance value in the bridge changes, the output voltage of the bridge will also change. By measuring the change in this output voltage, the change in the physical quantity in the environment can be known. Using a steel strand extensometer device to conduct elongation tests on steel strand samples, displacement and deformation data of the steel strand under different gravitational forces are obtained, verifying the reliability and accuracy in measuring the small displacement and deformation of the steel strand. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the attached drawings required for the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can be obtained based on these drawings.

[0015] Figure 1 It is the front view structural schematic diagram of the present invention;

[0016] Figure 2 It is the top view structural schematic diagram of the shield of the present invention;

[0017] In the figure, 1 - shield; 2 - bridge; 3 - first connecting rod; 4 - second connecting rod; 5 - spacing limiting plate; 6 - upper support frame; 7 - lower support frame; 8 - upper fixed knife; 9 - lower fixed knife; 10 - elastic sheet; 11 - strain spring arm. Detailed implementation manners

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] As Figure 1-2 shown, a steel strand extensometer device includes: a shield 1, inside which a strain spring arm 11 is installed. The strain spring arm 11 can be used to transmit power. An electric bridge 2 is provided on the upper part of the strain spring arm 11. The electric bridge 2 can measure the change of physical quantity by using the change of resistance value. An elastic sheet 10 is installed in the middle of the strain spring arm 11. By the elastic sheet 10, the force-receiving direction of the resistance can be made different to form a full-bridge type measurement circuit. First connecting rod 3 and second connecting rod 4 are installed at the end of the strain spring arm 11. The upper support frame 6 and the lower support frame 7 are fixed by using the first connecting rod 3 and the second connecting rod 4. The upper support frame 6 is installed at the end of the first connecting rod 3, and an upper fixed knife 8 is installed on the side of the upper support frame 6, and the upper fixed knife 8 can be installed on the upper side of the upper support frame 6. The lower support frame 7 is installed at the end of the second connecting rod 4, and a lower fixed knife 9 is installed on the side of the lower support frame 7, and the lower fixed knife 9 can be installed on the upper side of the lower support frame 7. A spacing limiting plate 5 is installed in the middle of the first connecting rod 3 and the second connecting rod 4, which is convenient for installing the spacing limiting plate 5 in the middle of the first connecting rod 3 and the second connecting rod 4.

[0020] Further, strain gauges are provided on the upper part of the strain elastic arms 11. There are 4 strain elastic arms 11 in total, and the strain gauges can be respectively installed on the upper part of the strain elastic arms 11, which can convert the deformation caused by the force on an object into an electrical signal.

[0021] Further, the strain elastic arms 11 are connected to the bridge 2, enabling the strain elastic arms 11 to be connected to the bridge 2.

[0022] Further, the upper fixed knife 8 and the lower fixed knife 9 are connected to the first connecting rod 3 and the second connecting rod 4 through rubber bands, and the rubber bands can be used to improve the stability of the upper fixed knife 8 and the lower fixed knife 9.

[0023] Further, mounting pins are provided on the upper parts of the upper support frame 6 and the lower support frame 7, facilitating the fixation of the upper support frame 6 and the lower support frame 7.

[0024] Further, the upper support frame 6 and the lower support frame 7 are fixedly connected to the first connecting rod 3 and the second connecting rod 4, and the upper support frame 6 and the lower support frame 7 can be installed at the ends of the first connecting rod 3 and the second connecting rod 4.

[0025] Further, a limit plate mounting hole is provided on the upper part of the second connecting rod 4, facilitating the installation of the spacing limit plate 5 in the middle of the second connecting rod 4.

[0026] Further, fixed mounting grooves are provided at the ends of the first connecting rod 3 and the second connecting rod 4, and the fixed mounting grooves are used to facilitate the fixation of the first connecting rod 3 and the second connecting rod 4.

[0027] The principle of the present utility model is that the strain elastic arm 11 can be installed inside the shield 1. The shield 1 can be used to improve the safety of the strain elastic arm 11. The strain elastic arm 11 can be used to transmit power. At the same time, four strain gauges are respectively installed on the upper part of the strain elastic arm 11, which can convert the deformation caused by the force on the object into an electrical signal. An elastic sheet 10 is installed on the upper part of the strain elastic arm 11. The elastic sheet 10 can make the force directions of the resistors different, forming a measurement circuit in the form of a full bridge, connecting the strain elastic arm 11 with the electric bridge 2. The electric bridge 2 can measure the change of the physical quantity by using the change of the resistance value. The first connecting rod 3 and the second connecting rod 4 are fixed through the fixed installation groove. At the same time, the spacing limiting plate 5 is installed in the middle of the second connecting rod 4. The upper support frame 6 and the lower support frame 7 are installed at the ends of the first connecting rod 3 and the second connecting rod 4. And the stability of the upper support frame 6 and the lower support frame 7 can be improved by using the installation pin. The stability of the upper fixing knife 8 and the lower fixing knife 9 can be improved by using the rubber band. At this time, the resistance bridge is in balance. In the electric bridge, when the value of the resistance changes, the output voltage of the electric bridge also changes. By measuring the change of this output voltage, the change of the physical quantity in the environment can be known. Pull out the installation pin, the strain elastic arm 11 is deformed by force, the resistance bridge loses balance, and the electric bridge 2 outputs an electrical signal. After this signal is amplified and processed, the deformation amount of the measured steel strand can be determined.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified and defined, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0029] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A steel strand extensometer device, comprising: Shield (1), characterized in that a strain elastic arm (11) is installed inside the shield (1), an electric bridge (2) is provided at the upper part of the strain elastic arm (11), an elastic sheet (10) is installed in the middle of the strain elastic arm (11), a first connecting rod (3) and a second connecting rod (4) are installed at the end of the strain elastic arm (11), an upper support frame (6) is installed at the end of the first connecting rod (3), an upper-side fixed knife (8) is installed on the side of the upper support frame (6), a lower support frame (7) is installed at the end of the second connecting rod (4), a lower-side fixed knife (9) is installed on the side of the lower support frame (7), and a spacing limiting plate (5) is installed in the middle of the first connecting rod (3) and the second connecting rod (4).

2. The extensometer device for steel strand according to claim 1, characterized in that, Strain gauges are provided at the upper part of the strain elastic arm (11), and there are 4 strain elastic arms (11) in total.

3. The extensometer device for steel strand according to claim 2, characterized in that, The strain elastic arm (11) is connected to the electric bridge (2).

4. The extensometer device for steel strand according to claim 1, wherein, The upper-side fixed knife (8) and the lower-side fixed knife (9) are connected to the first connecting rod (3) and the second connecting rod (4) through rubber bands.

5. A steel strand extensometer device according to claim 1, characterized in that, Mounting pins are provided at the upper parts of the upper support frame (6) and the lower support frame (7).

6. The extensometer device for steel strand according to claim 5, wherein The upper support frame (6) and the lower support frame (7) are fixedly connected to the first connecting rod (3) and the second connecting rod (4).

7. The device for measuring the elongation of a steel strand according to claim 6, characterized in that, A limiting plate mounting hole is provided at the upper part of the second connecting rod (4).

8. A steel strand extensometer device according to claim 6, characterized in that, Fixed mounting grooves are provided at the ends of the first connecting rod (3) and the second connecting rod (4).

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