Four-point bending device

Abstract

The utility model discloses a four-point bending device. The four-point bending device comprises a base; the first supporting frame and the second supporting frame are connected to the base in a sliding mode, and each of the first supporting frame and the second supporting frame is provided with a first hoop used for fixing a component with a circular outer section and a supporting plate used for supporting a component with a square outer section; the first shaft of the first hoop is rotatably connected to the two vertical plates of the first support frame or the second support frame, and the second shaft of the support plate is rotatably connected to the two vertical plates of the first support frame or the second support frame; and the pressure applying assembly is used for applying pressure to the component with the circular outer section and the component with the square outer section, the pressure applying assembly comprises a first pressure applying frame, a second pressure applying frame and a transverse plate, and the first pressure applying frame and the second pressure applying frame are each provided with a second hoop used for fixing the component with the circular outer section and a pressure applying plate used for applying pressure to the component with the square outer section. The four-point bending device disclosed by the utility model can be used for carrying out four-point bending tests on components with circular sections and square sections.

Description

Technical Field

[0001] This utility model relates to the field of materials mechanics testing, specifically to a four-point bending device. Background Technology

[0002] When conducting four-point bend tests on components with circular outer cross-sections, existing four-point bend devices apply load to the middle of the circular outer cross-section component. When the component bends, it changes from straight to bent, and the left and right sides of the support point rotate at a certain angle. However, common four-point bend devices generally use a fixed connection method, which affects the accuracy of the test data. Since engineering projects require components of different sizes (mainly including circular and square outer cross-section components), it is necessary to conduct bending performance tests on components of different sizes. However, common four-point bend test devices have requirements on the size of the components, requiring the components to be made to a fixed size to conduct four-point bend tests, which does not meet the engineering requirements for accurately grasping the bending performance of components of different sizes. Utility Model Content

[0003] The components that need to undergo four-point bending performance testing mainly include components with circular and square outer cross sections. This utility model provides a four-point bending device that can simultaneously perform four-point bending tests on components with circular and square outer cross sections.

[0004] This disclosure provides a four-point bending device, comprising: a base; a first support frame and a second support frame slidably connected to the base, wherein both the first and second support frames have a first sleeve for fixing a component with a circular outer cross-section and a support plate for supporting a component with a square outer cross-section, a first axis of the first sleeve being rotatably connected to two vertical plates of the first or second support frame, and a second axis of the support plate being rotatably connected to the two vertical plates of the first or second support frame; and a pressure-applying assembly for applying pressure to the component with the circular outer cross-section and the component with the square outer cross-section, the pressure-applying assembly comprising a first pressure-applying frame, a second pressure-applying frame, and a horizontal plate, the first and second pressure-applying frames being slidably connected to the horizontal plate, both having a second sleeve for fixing the component with the circular outer cross-section and a pressure plate for applying pressure to the component with the square outer cross-section, a third axis of the second sleeve being rotatably connected to the two vertical plates of the first or second pressure-applying frame, and a fourth axis of the pressure plate being rotatably connected to the two vertical plates of the first or second pressure-applying frame.

[0005] In some embodiments, the base has an I-shaped cross-section in the width direction, and the width of the side of the base away from the first support frame and the second support frame is greater than the width of the opposite side closer to the first support frame and the second support frame.

[0006] In some embodiments, the first support frame and the second support frame are capable of sliding along the length direction of the base.

[0007] In some embodiments, the length directions of the first axis, the second axis, the third axis, and the fourth axis are perpendicular to the length direction of the base.

[0008] In some embodiments, the first sleeve is provided with screw holes in a direction perpendicular to the first axis to fix the component with a circular outer cross section onto the sleeve ring of the first sleeve, wherein the first axis supports the sleeve ring of the first sleeve on two vertical plates of the first support frame or the second support frame.

[0009] In some embodiments, a hydraulic assembly is provided on the upper part of the cross plate at the intermediate position between the first pressure frame and the second pressure frame.

[0010] In some embodiments, the first pressure frame and the second pressure frame are capable of sliding along the length direction of the horizontal plate, which is aligned with the length direction of the base.

[0011] In some embodiments, the second sleeve is provided with screw holes in a direction perpendicular to the third axis to fix the component with a circular outer cross section onto the sleeve ring of the second sleeve, wherein the third axis supports the sleeve ring of the second sleeve on the two vertical plates of the first pressure frame or the second pressure frame.

[0012] This invention enables the testing of components using a four-point bend test. The support frame and pressure frame have hoops for components with circular outer cross-sections, which can be used to fix the circular outer cross-section components and perform a four-point bend test on them. The support frame and pressure frame also have support plates and pressure plates for supporting components (or plates) with square outer cross-sections, which can be used to support the square outer cross-section components and perform a four-point bend test on them.

[0013] Furthermore, this invention can perform four-point bend tests on components of different sizes. Both the support frame and the pressure frame can move along the length direction, the sleeve can be disassembled to fix components with circular outer cross-sections of different diameters, and the support plate can also support components with square outer cross-sections of different widths and thicknesses. Therefore, four-point bend tests can be performed on components of different sizes.

[0014] Furthermore, by setting a support plate, a pressure plate, and a sleeve that can rotate around the corresponding axis, this utility model enables the support plate, pressure plate, and sleeve to fit tightly against the component throughout the four-point bend test, making the data collected from the test more accurate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the four-point bending device of this utility model when pressing a component with a square outer cross section;

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the four-point bending device of this utility model when pressing a component with a circular outer cross section;

[0017] Figure 3 This is a perspective view of the pressure application component of the four-point bending device of this utility model;

[0018] Figure 4 This is a perspective view of the base and support frame of the four-point bending device of this utility model;

[0019] Figure 5 This is a perspective view of the support frame of the four-point bending device of this utility model;

[0020] Figure 6 This is a perspective view of the pressure frame on the pressure application component of the four-point bending device of this utility model;

[0021] Figure 7 This is a perspective view of the hoop used for a component with a circular outer cross-section in the four-point bending device of this utility model.

[0022] Figure 8 This is a perspective view of the support plate and pressure plate of the four-point bending device of this utility model. Detailed Implementation

[0023] The preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the four-point bending device of this utility model when pressing a component with a square outer cross section; Figure 2 This is a schematic diagram of the three-dimensional structure of the four-point bending device of this utility model when pressing a component with a circular outer cross section; Figure 3 This is a perspective view of the pressure application component of the four-point bending device of this utility model; Figure 4 This is a perspective view of the support frame of the four-point bending device of this utility model; Figure 5 This is a perspective view of the support frame of the four-point bending device of this utility model; Figure 6 This is a perspective view of the pressure frame on the pressure application component of the four-point bending device of this utility model; Figure 7 This is a perspective view of the hoop used for a component with a circular outer cross-section in the four-point bending device of this utility model. Figure 8 This is a perspective view of the support plate and pressure plate of the four-point bending device of this utility model.

[0025] refer to Figures 1 to 8 This disclosure provides a four-point bending device, including a pressure application assembly consisting of a cross plate 2 and a component movable in the length direction (e.g., Figure 1 The device comprises a pressure frame 6 (movable left and right on both sides) supporting a horizontal plate 2. In some embodiments, the pressure frame 6 includes a rotatable sleeve 8 for a member 3 with a circular outer cross-section and a rotatable pressure plate 10 for a member 4 with a square outer cross-section. In some embodiments, the four-point bending device further includes a base 1 and a support frame 5 movable along the base 1 in the longitudinal direction, the support frame 5 being slidably connected to the base 1. In some embodiments, such as Figure 1 As shown, the support frame 5 can be located on both sides of the pressure-applying assembly. In some embodiments, the support frame 5 includes a rotatable sleeve 7 for a member with a circular outer cross-section and a rotatable support plate 9 for a member with a square outer cross-section.

[0026] In some embodiments, the support frame 5 and the pressure frame 6 consist of two vertical plates and a horizontal plate connected between the two vertical plates. The ends of the horizontal plate can be connected to the two vertical plates in a snap-fit ​​structure. In some embodiments, the clamp 7 on the support frame 5 for the circular outer cross-section component and the clamp 8 on the pressure frame 6 consist of two fixed shafts 13 and a central clamp ring 12. The shafts 13 are rotatably connected to the corresponding two vertical plates. In some embodiments, when the circular outer cross-section component is subjected to compression and bending, the clamp 8 also rotates, so that the support point and the force application point of the circular outer cross-section component are hinged in the four-point bend test. This makes the collected four-point bend test data closer to the ideal situation and reduces experimental error. In some embodiments, the support plate 9 for the square outer section member on the support frame 5 and the pressure plate 10 for the square outer section member on the pressure frame 6 are composed of two fixed shafts 15 and a central plate 16. The shafts 15 are rotatably connected to the corresponding two vertical plates, so that the support point and the force application point of the square outer section member are in a hinged form in the four-point bend test. In this way, the collected four-point bend test data are closer to the ideal situation and the experimental error can be reduced.

[0027] In some embodiments, the support frame 5 and the pressure frame 6 are movable in the length direction of the base 1. Due to the snap-fit ​​structure design at the ends, the degrees of freedom in other directions are constrained, but the degrees of freedom in the length direction are not constrained, so it can be used to perform four-point bend tests on components of different sizes.

[0028] In some embodiments, the support frame 5 and the pressure frame 6 consist of two vertical plates and a horizontal plate connecting the two vertical plates. The ends of the support frame 5 and the pressure frame 6 have a snap-fit ​​structure to restrict their movement to the longitudinal direction (i.e., along the length of the base 1). Each of the two vertical plates of the support frame 5 has two cylindrical holes for supporting a clamp 7 for a component with a circular outer cross-section and a support plate 9 for a component with a square outer cross-section. In some embodiments, each of the two vertical plates of the pressure frame 6 has two cylindrical holes for supporting a clamp 8 for a component with a circular outer cross-section and a pressure plate 10 for a component with a square outer cross-section.

[0029] In some embodiments, the clamp 7 on the support frame 5 for the circular outer cross-section component and the clamp 8 on the pressure frame 6 consist of two fixed shafts 13 and a central clamp ring 12. The shafts 13 are fixed to both ends of the clamp ring 12, and screw holes 11 are provided at the upper and lower ends of the clamp ring 12 for fixing the clamp ring 12 to the circular outer cross-section component 3. In some embodiments, the line connecting the two shafts 13 may be perpendicular to the line connecting the two screw holes 11. It should be understood that the clamp 7 on the support frame 5 and the clamp 8 on the pressure frame 6 may include the same structure, and the support plate 9 on the support frame 5 and the pressure plate 10 on the pressure frame 6 may include the same structure.

[0030] In some embodiments, the base 1 has an I-shaped structure that is shorter at the top and wider at the bottom, so that the support frame 5 can move only in its longitudinal direction. In some embodiments, the horizontal plate 2 serves a similar purpose to the base 1, so that the pressure applying frame 6 can move only in the longitudinal direction of the horizontal plate 2 (which is also the longitudinal direction of the base 1). In some embodiments, the upper part of the horizontal plate 2 may be provided with a fixed hydraulic assembly for applying bending moment to the component.

[0031] The working principle of the four-point bend device disclosed herein is as follows: A component with a circular outer cross-section is fixed by a sleeve on a support frame for the component with a circular outer cross-section. The sleeve on the support frame for the component with a circular outer cross-section can rotate around the axis of the sleeve to ensure close contact with the surface of the component. The sleeve on the pressure frame for the component with a circular outer cross-section is used to fix the component and apply pressure. The sleeve on the pressure frame for the component with a circular outer cross-section can also rotate around the axis of the sleeve to fit against the surface of the component. A component with a square outer cross-section is placed on a support plate of the support frame. The support plate can rotate around the axis of the support plate to fit against the surface of the component. The pressure plate on the pressure frame is used to apply pressure to the component. The pressure plate on the pressure frame can also rotate around the axis of the pressure plate to fit against the surface of the component. Both the pressure frame and the support frame can rotate around their respective axes, which can accommodate components of different sizes to perform four-point bend tests. The movement of the pressure frame in the length direction can control the length of the pure bending section of the component. The support frame can move in the length direction according to the length of the component.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A four-point bending apparatus, characterized by, The utility model relates to a supporting device for a circular cross section component and a square cross section component, comprising: a base; a first supporting frame and a second supporting frame slidably connected to the base, wherein the first supporting frame and the second supporting frame each have a first sleeve for fixing the circular cross section component and a supporting plate for supporting the square cross section component, a first shaft of the first sleeve being rotatably connected to two vertical plates of the first supporting frame or the second supporting frame, and a second shaft of the supporting plate being rotatably connected to two vertical plates of the first supporting frame or the second supporting frame; a pressing assembly for pressing the circular cross section component and the square cross section component, the pressing assembly comprising a first pressing frame and a second pressing frame slidably connected to a cross plate, the first pressing frame and the second pressing frame each having a second sleeve for fixing the circular cross section component and a pressing plate for pressing the square cross section component, a third shaft of the second sleeve being rotatably connected to two vertical plates of the first pressing frame or the second pressing frame, and a fourth shaft of the pressing plate being rotatably connected to two vertical plates of the first pressing frame or the second pressing frame.

2. The four-point bending apparatus of claim 1, wherein, The cross section of the base in the width direction presents an I-shaped structure, and the width of the side of the base away from the first supporting frame and the second supporting frame is greater than the width of the opposite side close to the first supporting frame and the second supporting frame.

3. The four-point bending apparatus of claim 1, wherein, The first supporting frame and the second supporting frame can slide along the length direction of the base.

4. The four-point bending apparatus of claim 1, wherein, The length direction of the first shaft, the second shaft, the third shaft and the fourth shaft is perpendicular to the length direction of the base.

5. The four-point bending apparatus of claim 1, wherein, Screw holes are provided on the first sleeve in a direction perpendicular to the first shaft to fix the circular cross section component on a sleeve ring of the first sleeve, wherein the first shaft supports the sleeve ring of the first sleeve on two vertical plates of the first supporting frame or the second supporting frame.

6. The four-point bending apparatus of claim 1, wherein, A hydraulic assembly is provided on the upper part of the cross plate at the middle position between the first pressing frame and the second pressing frame.

7. The four-point bending apparatus of claim 1, wherein, The first pressing frame and the second pressing frame can slide in the length direction of the cross plate, which is consistent with the length direction of the base.

8. The four-point bending apparatus of claim 1, wherein, Screw holes are provided on the second sleeve in a direction perpendicular to the third shaft to fix the circular cross section component on a sleeve ring of the second sleeve, wherein the third shaft supports the sleeve ring of the second sleeve on two vertical plates of the first pressing frame or the second pressing frame.

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