Transmission rod facilitating adjustment of distance between two round rods

Abstract

The utility model discloses a transmission bar convenient for adjusting the distance between two round sticks, which comprises a transmission bar body, two round sticks and two adjusting assemblies, the two round sticks are both positioned on one side of the transmission bar body and are attached to the side wall of the transmission bar body, each adjusting assembly comprises a first fixing seat, a second fixing seat and an adjusting rod, the adjusting rod penetrates through the round sticks, and the first fixing seat is fixedly connected with the second fixing seat. And one end of the adjusting rod is rotationally connected with the first fixing seat, and the other end of the adjusting rod penetrates through the second fixing seat and is rotationally connected with the second fixing seat. The installation mode that the distance between the two round rods is adjusted through the adjusting assembly is adopted, and under the condition that the convenient adjustment of the distance between the two round rods is not affected, it can be ensured that the two round rods cannot slide down and cannot slide relative to the transmission rod body; therefore, the accuracy of the three-point bending test result of the sample Hopkinson pressure bar can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a Hopkinson pressure bar three-point bending test, in particular to a transmission bar which is convenient for adjusting the distance between two round sticks. Background Art

[0002] In the study of the mechanical response of materials under high strain rates, in order to solve the mutual influence of structural inertia effect (stress wave effect) and material strain rate effect, researchers designed a split Hopkinson pressure bar (Split Hopkinson Pressure Bar, SHPB) to achieve the decoupling of stress wave effect and strain rate effect in the test. The split Hopkinson pressure bar test device is currently the mainstream test device for studying material properties at home and abroad. With the deepening of research, people gradually introduced the split Hopkinson pressure bar into various material dynamic experimental studies, such as dynamic direct shear test, Brazilian disk test, half Brazilian disk test, etc. Among them, in order to better study the crack propagation behavior and strength characteristics of materials during dynamic impact, many scholars have gradually developed a dynamic three-point bending test using a half Brazilian disk specimen configuration. In the half-Brazilian disc test using a Hopkinson bar for dynamic three-point bending, it is necessary to add two round sticks between the specimen (i.e., the test piece of the Hopkinson bar three-point bending test) and the transmission rod to perform a dynamic impact test. For this purpose, we need to provide a transmission rod for the Hopkinson bar three-point bending test.

[0003] In the semi-Brazilian disc test, in order to explore the influence of the ratio of the distance (span) between the two round sticks and the disc radius on the semi-Brazilian disc three-point bending dynamic test, it is necessary to adjust the distance between the two round sticks. At present, in order to facilitate the adjustment of the distance between the two round sticks, the round sticks are clamped by the specimen and the transmission rod (that is, the two round sticks are installed in a manner of artificially close to the transmission rod, rather than a fixed installation method). However, since the transmission rod is placed horizontally and the two round sticks are very likely to slide during impact, the distance between the two round sticks changes, which in turn affects the accuracy of the specimen test results. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the technical problem that the existing close installation method of the round stick and the transmission rod affects the accuracy of the sample test result, the utility model provides a transmission rod which is convenient for adjusting the distance between the two round sticks. By improving the structure of the transmission rod, the accuracy of the sample Hopkinson pressure bar three-point bending test result can be improved without affecting the convenient adjustment of the distance between the two round sticks.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a transmission rod that is easy to adjust the distance between two round sticks, including: a transmission rod body, two round sticks and two adjustment components, the two round sticks are both located on one side of the transmission rod body and fit with the side wall of the transmission rod body, and the two round sticks are symmetrically arranged about the center o of the transmission rod body, the adjustment component includes: a first fixed seat, a second fixed seat and an adjustment rod, the first fixed seat is located between the two round sticks and connected to the transmission rod body, the second fixed seat is located on the side of the round stick away from the first fixed seat, and connected to the transmission rod body, the adjustment rod passes through the round stick and is threadedly connected to the round stick, one end of the adjustment rod is rotatably connected to the first fixed seat, and the other end of the adjustment rod passes through the second fixed seat and is rotatably connected to the second fixed seat.

[0006] Therefore, when conducting a three-point bending test of a Hopkinson pressure bar, the installation method of adjusting the distance between the two rods by adjusting the assembly is simple in structure and easy to operate, compared to the installation method of fitting the two round sticks to the transmission rod body and manually adjusting the distance. Without affecting the convenient adjustment of the distance between the two round sticks, it can ensure that the two round sticks will not slide down and will not slide relative to the transmission rod body, thereby improving the accuracy of the results of the three-point bending test of the Hopkinson pressure bar of the sample.

[0007] Furthermore, the adjustment assembly further comprises: an adjustment nut, which is mounted on the other end of the adjustment rod. Thus, the adjustment rod can be easily rotated by the adjustment nut, so that the round stick moves along the axial direction of the adjustment rod to adjust the distance between the two round sticks.

[0008] Furthermore, a scale is embedded on one side of the transmission rod body. Therefore, during the process of adjusting the distance between the two round rods, the scale can be used to detect the distance between the two round rods in real time, which can further improve the accuracy of the results of the three-point bending test of the sample Hopkinson pressure bar.

[0009] Furthermore, the axis A where the round stick is located is perpendicular to the axis B where the scale is located. Thus, the accuracy of the position reading of the round stick can be ensured through the vertical installation method.

[0010] Furthermore, the diameter of the round stick is d1, the length of the first fixing seat is d2, the distance between the end face of the second fixing seat away from the transmission rod body and the end face where the scale is located is d3, and the diameter of the adjustment rod is d4; wherein: d1>d2, d1>d3, d1>d4. Thus, when performing the Hopkinson bar three-point bending test, it can be ensured that the sample fits the round stick and does not contact the adjustment component, thereby not affecting the normal performance of the sample Hopkinson bar three-point bending test.

[0011] Furthermore, a strain gauge is provided on the outer peripheral surface of the transmission rod body, thereby being able to sense the impact signal generated by the dynamic impact of the sample.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] When conducting a three-point bending test of a Hopkinson pressure bar, the installation method of adjusting the distance between the two rods by adjusting the assembly is simple in structure and easy to operate, compared to the installation method of fitting the two round sticks to the transmission rod body and manually adjusting the distance. Without affecting the convenient adjustment of the distance between the two round sticks, it can ensure that the two round sticks will not slide down and will not slide relative to the transmission rod body, thereby improving the accuracy of the results of the three-point bending test of the Hopkinson pressure bar of the specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic structural diagram of a transmission rod for facilitating adjustment of the distance between two round sticks of the utility model;

[0016] Figure 2 A top view of the transmission rod of the utility model for facilitating adjustment of the distance between two round sticks;

[0017] Figure 3 For the utility model Figure 2 A schematic diagram of the enlarged local structure at center A;

[0018] Figure 4 It is a structural schematic diagram of the transmission rod body of the utility model;

[0019] Figure 5 It is a structural schematic diagram of the adjustment component of the utility model.

[0020] In the figure: 1, transmission rod body; 101, scale; 102, strain gauge; 2, round stick; 3, adjustment assembly; 301, first fixing seat; 302, second fixing seat; 303, adjustment rod; 304, adjustment nut. DETAILED DESCRIPTION

[0021] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0022] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figures 1 to 5As shown, it is the optimal embodiment of the utility model. The transmission rod of this embodiment is convenient for adjusting the distance between two round sticks, including: a transmission rod body 1, two round sticks 2 and two adjustment components 3. The two round sticks 2 are both located on one side of the transmission rod body 1 and fit with the side wall of the transmission rod body 1, and the two round sticks 2 are symmetrically arranged about the center o of the transmission rod body 1. The adjustment component 3 includes: a first fixed seat 301, a second fixed seat 302 and an adjustment rod 303. The first fixed seat 301 is located between the two round sticks 2 and is connected to the transmission rod body 1. The second fixed seat 302 is located on the side of the round stick 2 away from the first fixed seat 301 and is connected to the transmission rod body 1. The adjustment rod 303 penetrates the round stick 2 and is threadedly connected to the round stick 2. One end of the adjustment rod 303 is rotatably connected to the first fixed seat 301, and the other end of the adjustment rod 303 penetrates the second fixed seat 302 and is rotatably connected to the second fixed seat 302. Therefore, when conducting a three-point bending test of a Hopkinson pressure bar, the installation method of adjusting the distance between the two rods by adjusting the component 3 is simple in structure and easy to operate, compared with the installation method of fitting the two round rods 2 to the transmission rod body 1 and manually adjusting the distance. Without affecting the convenient adjustment of the distance between the two round rods 2, it can ensure that the two round rods 2 will not slide down and will not slide relative to the transmission rod body 1, thereby improving the accuracy of the results of the three-point bending test of the sample Hopkinson pressure bar.

[0025] In other words, manual adjustment is prone to deviation. On the one hand, it will cause inaccurate adjustment of the distance between the two round sticks 2, and on the other hand, it will cause the two round sticks 2 to be not symmetrically arranged about the center o of the transmission rod body 1. However, by adjusting the adjustment component 3, on the one hand, the distance between the two round sticks 2 can be accurately adjusted, and on the other hand, it can ensure that the two round sticks 2 are always symmetrically arranged about the center o of the transmission rod body 1.

[0026] Specifically, the two adjustment components 3 share a first fixing seat 301 .

[0027] In this embodiment, the adjustment assembly 3 further includes: an adjustment nut 304, which is mounted on the other end of the adjustment rod 303. Thus, the adjustment rod 303 can be easily rotated by adjusting the nut 304, so that the round rod 2 moves along the axial direction of the adjustment rod 303, so as to adjust the distance between the two round rods 2.

[0028] In this embodiment, a scale 101 is embedded on one side of the transmission rod body 1, and the axis A of the round rod 2 is perpendicular to the axis B of the scale 101. Therefore, in the process of adjusting the distance between the two round rods 2, the distance between the two round rods 2 can be detected in real time through the scale 101, which can further improve the accuracy of the results of the three-point bending test of the sample Hopkinson pressure bar; through the vertical installation method, the accuracy of the position reading of the round rod 2 can be ensured.

[0029] In this embodiment, the diameter of the round rod 2 is d1, the length of the first fixing seat 301 is d2, the distance between the end face of the second fixing seat 302 away from the transmission rod body 1 and the end face where the scale 101 is located is d3, and the diameter of the adjustment rod 303 is d4; wherein: d1>d2, d1>d3, d1>d4. Thus, when performing the Hopkinson bar three-point bending test, it can be ensured that the sample fits the round rod 2 and does not contact the adjustment component 3, thereby not affecting the normal performance of the sample Hopkinson bar three-point bending test.

[0030] In this embodiment, a strain gauge 102 is provided on the outer peripheral surface of the transmission rod body 1. Thus, the impact signal generated by the dynamic impact of the sample can be sensed.

[0031] To sum up, when the Hopkinson pressure bar three-point bending test is carried out, the installation method of adjusting the distance between the two rods by adjusting the component 3 is simple in structure and easy to operate compared to the installation method in which the two round sticks 2 are fitted to the transmission rod body 1 and the distance is adjusted manually. Without affecting the convenient adjustment of the distance between the two round sticks 2, it can ensure that the two round sticks 2 will not slide down and will not slide relative to the transmission rod body 1, thereby improving the accuracy of the Hopkinson pressure bar three-point bending test results of the sample.

[0032] The above description is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A transmission rod that is convenient for adjusting the distance between two round rods, characterized in that: include: a transmission rod body (1), and Two round sticks (2), both of which are located on one side of the transmission rod body (1) and fit with the side wall of the transmission rod body (1), and the two round sticks (2) are symmetrically arranged about the center o of the transmission rod body (1); Two adjustment components (3), the adjustment components (3) comprising: A first fixed seat (301), a second fixed seat (302) and an adjusting rod (303), wherein the first fixed seat (301) is located between the two round rods (2) and is connected to the transmission rod body (1); the second fixed seat (302) is located on the side of the round rod (2) away from the first fixed seat (301) and is connected to the transmission rod body (1); the adjusting rod (303) passes through the round rod (2) and is threadedly connected to the round rod (2); one end of the adjusting rod (303) is rotatably connected to the first fixed seat (301); the other end of the adjusting rod (303) passes through the second fixed seat (302) and is rotatably connected to the second fixed seat (302).

2. The transmission rod for facilitating adjustment of the distance between two round rods according to claim 1, characterized in that: The regulating component (3) further comprises: An adjusting nut (304) is installed at the other end of the adjusting rod (303).

3. The transmission rod for facilitating adjustment of the distance between two round rods according to claim 1, characterized in that: A scale (101) is embedded on one side of the transmission rod body (1).

4. The transmission rod for facilitating adjustment of the distance between two round rods according to claim 3, characterized in that: The axis line A where the round stick (2) is located and the axis line B where the scale (101) is located are perpendicular to each other.

5. The transmission rod for facilitating adjustment of the distance between two round rods according to claim 3, characterized in that: The diameter of the round rod (2) is d1, the length of the first fixing seat (301) is d2, the distance between the end face of the second fixing seat (302) away from the transmission rod body (1) and the end face where the scale (101) is located is d3, and the diameter of the adjustment rod (303) is d4; Among them: d1>d2, d1>d3, d1>d4.

6. The transmission rod for facilitating adjustment of the distance between two round rods according to claim 1, characterized in that: The outer peripheral surface of the transmission rod body (1) is provided with a strain gauge (102).

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