A tensile-to-compression calibration fixture and tensile testing machine

Abstract

This utility model relates to a tensile-to-compression calibration fixture and a tensile testing machine. It solves the technical problem of unreasonable design in existing calibration fixtures. The tensile-to-compression calibration fixture includes: an upper frame, comprising an upper mounting plate and a bottom plate arranged vertically at intervals, with two symmetrically arranged upper guide posts passing through the upper mounting plate and the bottom plate; and a lower frame, comprising a lower mounting plate and a top plate arranged vertically at intervals, with two symmetrically arranged lower guide posts passing through the lower mounting plate and the top plate; the bottom plate and the top plate both pass through the upper and lower guide posts, and the horizontal connecting line between the two upper guide posts is perpendicular to the horizontal connecting line between the two lower guide posts. This tensile-to-compression calibration fixture ensures uniform force distribution throughout the fixture, more precise and reliable motion guidance, and avoids direct collision between the top and bottom plates and hand pinching problems during idle movement.

Description

Technical Field

[0001] This utility model belongs to the field of tensile testing machines, and relates to a tensile-to-compression calibration fixture and a tensile testing machine. Background Technology

[0002] For example, Chinese patent literature discloses a reverse force measuring fixture for calibrating a tensile testing machine [202123251511.5], which includes a fixed frame and a movable frame; the fixed frame includes an upper frame, a left frame, a right frame, and a bottom frame, and the movable frame includes a top beam, guide columns, and a base. The top beam is set on the top outer side of the fixed frame, and two guide columns are vertically mounted on the upper frame of the fixed frame. The top end of the guide column is fixedly connected to the top beam, and the bottom end of the guide column is fixedly connected to the base; a first connector is provided on the bottom surface of the bottom frame of the fixed frame, and a second connector is provided on the top surface of the top beam of the movable frame.

[0003] The drawbacks of the above technical solution are: the guide structure with parallel spacing has poor guiding effect and lacks a buffer structure, which can easily lead to material damage, pinching, and other problems. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a tensile-to-compression calibration fixture and a tensile testing machine.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] The tensile-to-compression calibration fixture includes:

[0007] The upper frame includes a vertically spaced upper mounting plate and an abutting bottom plate, with two symmetrically arranged upper guide columns passing through between the upper mounting plate and the abutting bottom plate;

[0008] The lower frame includes a vertically spaced lower mounting plate and an abutting top plate, with two symmetrically arranged lower guide columns passing through between the lower mounting plate and the abutting top plate;

[0009] Both the bottom plate and the top plate pass through the upper guide post and the lower guide post. The top plate is located above the bottom plate, and the horizontal connecting line between the two upper guide posts is perpendicular to the horizontal connecting line between the two lower guide posts. The end of the upper guide post near the bottom plate and the end of the lower guide post near the top plate are both fitted with buffer sleeves.

[0010] Furthermore, the spacing between the lower guide posts is greater than the spacing between the upper guide posts.

[0011] Furthermore, the horizontal cross-section of the bottom plate and the top plate is flat.

[0012] Furthermore, the bottom plate and the top plate are provided with straight edge cut surfaces on both sides.

[0013] Furthermore, a recessed positioning groove is provided at the upper center of the abutting base plate.

[0014] Furthermore, both the upper end of the upper mounting plate and the bottom of the lower mounting plate are provided with protruding clamping heads.

[0015] Furthermore, the clamping head is rectangular in shape, and positioning notches are provided on both sides of the clamping head.

[0016] Furthermore, the buffer sleeve is a spacer that is fitted onto the upper guide post and the lower guide post.

[0017] Furthermore, the buffer sleeve includes a contact sleeve fitted onto the upper guide post and the lower guide post, and a spring connecting the contact sleeve to the bottom plate and the top plate.

[0018] This utility model also provides a tensile testing machine having the tensile-to-compression calibration fixture as described above.

[0019] Compared with existing technologies, this tensile-to-compression calibration fixture and tensile testing machine combination forms a circumferentially distributed guide structure, which makes the entire fixture uniformly stressed, more accurate and reliable in motion guidance, and forms a minimum gap between the top plate and the bottom plate, avoiding direct collision between the top plate and the bottom plate and the problem of pinching hands when moving idly. Attached Figure Description

[0020] Figure 1 A schematic diagram of a tension-to-compression calibration fixture provided by this utility model.

[0021] Figure 2 for Figure 1 Schematic diagram of the cross-section of the tensile-to-compression calibration fixture Figure 1 .

[0022] Figure 3 for Figure 1 Schematic diagram of the cross-section of the tensile-to-compression calibration fixture Figure 2 .

[0023] In the diagram, 10 is the upper frame; 11 is the upper mounting plate; 12 is the bottom plate; 13 is the upper guide post; 14 is the straight edge cut surface; 15 is the positioning groove; 20 is the lower frame; 21 is the lower mounting plate; 22 is the top plate; 23 is the lower guide post; 30 is the buffer sleeve; 31 is the spacer; 32 is the contact sleeve; 33 is the spring; 40 is the clamping head; and 41 is the positioning notch. Detailed Implementation

[0024] Example 1, please refer to Figures 1 to 2This diagram illustrates a tension-to-compression calibration fixture and a tensile testing machine provided by this utility model. The tension-to-compression calibration fixture includes an upper frame 10 at the upper end and a lower frame 20 at the lower end. The upper frame 10 and lower frame 20 are interlocked and slidably connected, forming a reverse clamping space between them. Placing a standard force gauge in this clamping space converts the tension provided by the tensile testing machine into pressure acting on the standard force gauge, thereby achieving the purpose of calibrating the tensile testing machine. It is conceivable that this tension-to-compression calibration fixture also includes other functional components and specific structures, such as guide components and mounting structures, all of which are well-known to those skilled in the art and will not be described in detail here.

[0025] In this embodiment, the upper frame 10 includes a vertically spaced upper mounting plate 11 and a bottom abutment plate 12. Two symmetrically arranged upper guide posts 13 are inserted between the upper mounting plate 11 and the bottom abutment plate 12. One end of the lower frame 20 is slidably mounted on the upper frame 10, with the upper guide posts 13 providing motion guidance. The upper mounting plate 11 and the bottom abutment plate 12 limit the movement range of the lower frame 20. During calibration, a standard force gauge needs to be placed on the top of the bottom abutment plate 12.

[0026] In this embodiment, the lower frame 20 is disposed at the lower end of the upper frame 10. Specifically, the lower frame 20 includes a vertically spaced lower mounting plate 21 and an abutting top plate 22, with two symmetrically arranged lower guide posts 23 passing through between the lower mounting plate 21 and the abutting top plate 22. Similarly, one end of the upper frame 10 is slidably disposed on the lower frame 20, with the lower guide posts 23 providing motion guidance, and the lower mounting plate 21 and the abutting top plate 22 limiting the movement range of the lower frame 20.

[0027] In this embodiment, the top abutment plate 22 is located above and clamps the bottom abutment plate 12. Both the bottom abutment plate 12 and the top abutment plate 22 pass through the upper guide post 13 and the lower guide post 23. The bottom abutment plate 12 is provided with a guide sleeve relative to the lower guide post 23, and the top abutment plate 22 is provided with a guide sleeve relative to the upper guide post 13. The guide sleeve is a bushing, which is prior art and is not shown in the figure. It can be imagined that when the upper frame 10 and the lower frame 20 move relative to each other, the top abutment plate 22 and the bottom abutment plate 12 are guided by the two sets of guide structures, the upper guide post 13 and the lower guide post 23. The horizontal connecting line between the two upper guide posts 13 and the horizontal connecting line between the two lower guide posts 23 are perpendicular to each other, forming a circumferentially distributed guide structure, so that the entire clamp is subjected to uniform force and the motion guidance is more accurate and reliable.

[0028] In this embodiment, a buffer sleeve 30 is fitted onto the end of the upper guide post 13 near the bottom plate 12 and the end of the lower guide post 23 near the top plate 22. The buffer sleeve 30 is a spacer 31 fitted onto the upper guide post 13 and the lower guide post 23. The spacer 31 can be made of a hard material such as plastic or an elastic material such as rubber. The spacer 31 can form a minimum gap between the top plate 22 and the bottom plate 12 when the upper frame 10 and the lower frame 20 move, avoiding direct collision between the top plate 22 and the bottom plate 12 and the problem of pinching hands when moving without a load.

[0029] In other embodiments, please refer to Figure 3 The buffer sleeve 30 includes a contact sleeve 32 sleeved on the upper guide post 13 and the lower guide post 23, and a spring 33 connecting the contact sleeve 32 to the bottom plate 12 and the top plate 22. The contact sleeve 32 fits against the bottom plate 12 and the top plate 22, and the spring 33 forms a motion buffer to slow down the movement speed when the bottom plate 12 and the top plate 22 approach each other, thereby increasing the efficiency and accuracy of the calibration.

[0030] In this embodiment, the spacing between the lower guide posts 23 is greater than the spacing between the upper guide posts 13, which increases the insertion space for placing a standard force gauge without changing the circumferentially distributed guide structure.

[0031] Please see Figures 1 to 3 In this embodiment, a recessed positioning groove 15 is provided in the upper middle part of the bottom plate 12. The positioning groove 15 is used to determine the placement position of the standard force gauge, keep it centered, avoid the problem of test deviation or even the tipping of the standard force gauge due to force deviation, and reduce the distance between the top plate 22 and the bottom plate 12, thereby increasing the calibration accuracy.

[0032] Ideally, the horizontal cross-sections of the bottom plate 12 and the top plate 22 are flat. In this embodiment, the horizontal cross-sections of the bottom plate 12 and the top plate 22 are elliptical, which reduces the three-dimensional space occupied by the overall fixture and facilitates storage and installation. Even more ideally, the bottom plate 12 and the top plate 22 are provided with straight edge cut surfaces 14 on both sides. The straight edge cut surfaces 14 allow the fixture to be placed horizontally and stably, further improving the ease of storage when not in use.

[0033] In this embodiment, both the upper end of the upper mounting plate 11 and the bottom of the lower mounting plate 21 are provided with protruding clamping heads 40. During installation, the clamping heads 40 are fixed by clamping them with the jaws at both ends of the tensile testing machine. Optimally, the clamping heads 40 are rectangular blocks, and positioning notches 41 are provided on both sides of the clamping heads 40. The rectangular block structure ensures the surface fit between the tensile testing machine jaws and the clamping heads 40. At the same time, the jaws have positioning protrusions that are correspondingly embedded in the positioning notches 41, ensuring the clamping overlap and clamping accuracy between the jaws and the clamping heads 40, and avoiding the problem of unreliable clamping.

[0034] Example 2: This utility model also provides a tensile testing machine with the tensile-to-compression calibration fixture as described above. Except for the tensile-to-compression calibration fixture, all other components are existing technology or commercially available parts.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A tension-to-compression calibration fixture, characterized in that, include: The upper frame (10) includes an upper mounting plate (11) and an abutting bottom plate (12) arranged vertically at intervals, and two symmetrically arranged upper guide columns (13) are provided between the upper mounting plate (11) and the abutting bottom plate (12). The lower frame (20) includes a vertically spaced lower mounting plate (21) and an abutting top plate (22), and two symmetrically arranged lower guide columns (23) are provided between the lower mounting plate (21) and the abutting top plate (22). The bottom plate (12) and the top plate (22) both pass through the upper guide post (13) and the lower guide post (23). The top plate (22) is located above the bottom plate (12), and the horizontal connecting line between the two upper guide posts (13) is perpendicular to the horizontal connecting line between the two lower guide posts (23). The end of the upper guide post (13) near the bottom plate (12) and the end of the lower guide post (23) near the top plate (22) are both fitted with a buffer sleeve (30).

2. The tension-to-compression calibration fixture according to claim 1, characterized in that, The spacing between the lower guide posts (23) is greater than the spacing between the upper guide posts (13).

3. The tension-to-compression calibration fixture according to claim 2, characterized in that, The horizontal cross-sections of the bottom plate (12) and the top plate (22) are flat.

4. The tension-to-compression calibration fixture according to claim 3, characterized in that, The bottom plate (12) and the top plate (22) are provided with straight edge cut surfaces (14) on both sides.

5. The tension-to-compression calibration fixture according to claim 4, characterized in that, The upper middle part of the abutting base plate (12) is provided with a recessed positioning groove (15).

6. The tension-to-compression calibration fixture according to claim 1, characterized in that, The upper end of the upper mounting plate (11) and the bottom of the lower mounting plate (21) are both provided with protruding clamp heads (40).

7. The tension-to-compression calibration fixture according to claim 6, characterized in that, The clamping head (40) is rectangular and has positioning notches (41) on both sides.

8. The tension-to-compression calibration fixture according to claim 1, characterized in that, The buffer sleeve (30) is a spacer (31) that is sleeved between the upper guide post (13) and the lower guide post (23).

9. The tension-to-compression calibration fixture according to claim 1, characterized in that, The buffer sleeve (30) includes a contact sleeve (32) sleeved on the upper guide post (13) and the lower guide post (23), and a spring (33) connecting the contact sleeve (32) to the bottom plate (12) and the top plate (22).

10. A tensile testing machine, characterized in that, The tensile-to-compression calibration fixture is as described in any one of claims 1-9.

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