Measuring clamp tool for stress ring

Abstract

The utility model discloses a measuring clamp tool for a stress ring, which belongs to the technical field of stress rings and comprises a stress ring to be tested, a measuring clamping plate arranged on the upper portion of the stress ring to be tested, fastening bolts movably connected to the stress ring to be tested and the measuring clamping plate, and a measuring micrometer arranged at the bottom of the measuring clamping plate. The bottom of the measuring micrometer is provided with the measuring connecting part, the bottom of the measuring micrometer tightly abuts against the measuring connecting part, the round bar is further arranged between the stress ring to be tested and the measuring clamping plate, due to the existence of the round bar, uniform stress between the stress ring and the measuring clamping plate is ensured, measuring errors caused by uneven local stress are avoided, and the measuring precision is improved.

Description

Technical Field

[0001] This utility model belongs to the field of stress ring technology, specifically a measuring fixture for stress rings. Background Technology

[0002] Stress rings are crucial components used for stress analysis and testing of structural members. Accurate measurement of stress ring deformation under stress is essential to ensure the safe operation of structural members. By measuring the deformation of stress rings under different loads, engineers can assess their performance under operating conditions, identify potential damage risks in advance, and prevent structural failure due to excessive deformation.

[0003] However, in actual measurement, traditional measuring fixtures usually rely on the direct contact force between the fixture and the workpiece surface to measure deformation when contacting the stress ring. However, when the stress ring deforms during compression, due to the rigidity of the fixture and the deformation characteristics of the stress ring, the fixture may not be able to maintain stable contact with the stress ring, resulting in loosening or slippage of the contact point. Uneven local force leads to measurement errors and affects measurement accuracy. Utility Model Content

[0004] The purpose of this invention is to provide a stress ring measuring fixture to solve at least one aspect of the problems and defects mentioned in the background art.

[0005] A measuring fixture for a stress ring is provided, comprising a stress ring to be tested, a measuring clamp plate disposed on the upper part of the stress ring to be tested, a fastening bolt movably connected to the stress ring to be tested and the measuring clamp plate, a measuring micrometer disposed on the bottom of the measuring clamp plate, a measuring connection part disposed on the bottom of the measuring micrometer, the bottom of the measuring micrometer being pressed against the measuring connection part, and a round bar disposed between the stress ring to be tested and the measuring clamp plate.

[0006] Furthermore, the measuring micrometer is detachably connected to the bottom of the measuring fixture, facilitating the replacement of micrometers of different specifications and improving measurement adaptability. It also facilitates maintenance and calibration, enhancing measurement reliability. The optimized installation method reduces errors and improves measurement stability. Adapting to different measurement directions and working conditions increases measurement flexibility.

[0007] Furthermore, a V-groove is provided on the upper part of the measuring clamp, and a round bar is clamped on the upper part of the V-groove. The V-groove ensures that the position of the round bar remains unchanged, avoiding measurement errors caused by the slight lateral displacement of the stress ring during the measurement process. The round bar can reduce the friction between the measuring clamp and the stress ring to be tested, ensuring that the stress ring to be tested can deform freely after being subjected to force, without generating additional stress due to excessive clamping, which would affect the true measurement value of the deformation.

[0008] Furthermore, the measuring connection is threaded onto the stress ring to be tested, ensuring that the measuring connection and the stress ring to be tested maintain a tight contact and will not loosen or shift due to external force.

[0009] Furthermore, a polytetrafluoroethylene (PTFE) coating is provided above the V-groove. PTFE has an extremely low coefficient of friction, which can effectively reduce the frictional resistance between the stress ring and the V-groove during the deformation process under stress. This helps the stress ring to deform freely during the measurement process, avoiding stress concentration or local deformation caused by friction, thereby improving the accuracy of the measurement.

[0010] Furthermore, the micrometer has a ball-shaped end face at the bottom and a spherical groove above the measuring connection part, ensuring that the measuring head of the micrometer can always act perpendicularly on the measuring connection part, reducing measurement deviations caused by assembly errors.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The stress ring under test is in a free state and connected to the measuring clamp by fastening bolts. The measuring clamp is located below the stress ring and contacts it through a round bar to ensure uniform force distribution. A micrometer is mounted at the bottom of the measuring fixture, with its measuring end in close contact with the measuring connection. In the initial measuring position, the fastening bolts are tightened downwards, gradually applying pressure to the stress ring and causing it to deform. Due to this deformation, the stress ring's height or shape changes slightly, leading to a change in the position of the measuring clamp. This change in the measuring clamp causes the measuring end of the micrometer (through the measuring connection) to shift accordingly. The amount of deformation of the stress ring is recorded, ensuring uniform force distribution between the stress ring and the measuring clamp, avoiding measurement errors caused by uneven local force distribution, and improving measurement accuracy. Attached Figure Description

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 A schematic diagram of the overall structure of a measuring fixture for stress rings;

[0015] Figure 2 for Figure 1 Enlarged view of the structure of region A in the middle.

[0016] In the figure: 1. Stress ring to be tested; 2. Fastening bolt; 3. Measuring clamp; 4. Measuring micrometer; 41. Ball end face; 5. Measuring connection; 51. Spherical groove; 6. Round bar. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0018] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0019] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0020] Please see Figure 1-2 As shown in the embodiment of this utility model, a measuring fixture for a stress ring includes a stress ring 1 to be tested, a measuring clamping plate 3 is provided on the upper part of the stress ring 1 to be tested, a fastening bolt 2 is movably connected to the stress ring 1 to be tested and the measuring clamping plate 3, a fastening bolt 2 is provided on the upper contact surface between the measuring clamping plate 3 and the stress ring 1 to be tested, a measuring micrometer 4 is provided at the bottom of the measuring clamping plate 3, a measuring connecting part 5 is provided at the bottom of the measuring micrometer 4, the bottom of the measuring micrometer 4 is pressed against the measuring connecting part 5, and a round bar 6 is also provided between the lower contact surface of the stress ring 1 to be tested and the measuring clamping plate 3.

[0021] The upper part of the measuring clamp 3 is fixed to the upper part of the stress ring 1 to be tested, and has a threaded hole on its upper part. The upper part of the stress ring 1 to be tested also has a threaded hole on one side. The fastening bolt 2 is movably connected between the upper part 1 of the stress ring to be tested and the measuring clamp 3. The lower part of the measuring clamp 3 is located below the stress ring 1 to be tested and contacts the stress ring 1 through the round bar 6 to ensure uniform force distribution. The measuring micrometer 4 is installed at the bottom of the measuring clamp 3, and its measuring end is in close contact with the measuring connection part 5. In the initial measuring position, as the fastening bolt 2 is gradually tightened downwards, the axial force of the fastening bolt 2 will directly act on the measuring clamp 3, causing it to... Pressure is applied downwards, and the pressure is evenly transmitted to the stress ring 1 under test through the measuring clamp 3 and the round bar 6, thereby subjecting the stress ring 1 to axial compressive force. Due to the deformation of the stress ring 1, the height or shape changes slightly, and the position of the measuring clamp 3 changes. Due to the change of the measuring clamp 3, the measuring end of the measuring micrometer 4 will also shift accordingly, recording the amount of deformation of the stress ring 1 under test. The measuring micrometer 4 will accurately record the amount of displacement of the stress ring 1 under test. Due to the presence of the round bar 6, the uniform force between the stress ring 1 under test and the lower contact surface of the measuring clamp 3 is ensured, avoiding measurement errors caused by uneven local force.

[0022] In one embodiment, see Figure 1 and Figure 2 As shown, the measuring micrometer 4 is detachably connected to the bottom of the measuring clamp 3, facilitating the replacement of micrometers of different specifications and improving measurement adaptability. It also facilitates maintenance and calibration, enhancing measurement reliability. The optimized installation method reduces errors and improves measurement stability. Furthermore, it adapts to different measurement directions and working conditions, increasing measurement flexibility.

[0023] In one embodiment, see Figure 1 and Figure 2 As shown, the upper part of the measuring clamp 3 is provided with a V-shaped groove, and a round bar 6 is clamped on the upper part of the V-shaped groove. The V-shaped groove provides two symmetrical contact points, so that the round bar 6 can be stably clamped in a fixed position to prevent slippage. Since the V-shaped groove provides a stable support point, it can ensure that the round bar 6 will not shift or roll after being subjected to force, ensuring that the stress ring 1 under test is subjected to uniform force. During the test, the stress ring 1 under test is in direct contact with the round bar 6, rather than the measuring clamp 3, reducing frictional interference between the measuring clamp 3 and the stress ring 1 under test, making the movement of the stress ring smoother when deformed under force. The V-shaped groove ensures that the fixed position of the round bar 6 remains unchanged, avoiding measurement errors caused by the slight lateral displacement of the stress ring during the measurement process. The round bar 6 can reduce the friction between the measuring clamp 3 and the stress ring 1 under test, ensuring that the stress ring 1 under test can deform freely after being subjected to force, without generating additional stress due to excessive clamping, which would affect the true measurement value of the deformation.

[0024] In one embodiment, see Figure 1 and Figure 2As shown, the measuring connection 5 is threaded onto the stress ring 1 to be tested. The threaded connection provides a reliable fixing method, ensuring that the measuring connection 5 and the stress ring 1 to be tested maintain a tight contact and will not loosen or shift due to external force.

[0025] Since the stress ring 1 to be tested will undergo slight deformation when subjected to force, if other connection methods (such as snap-fit ​​or adhesive) are used, the contact may be unstable due to stress changes. However, the threaded connection can resist the influence of axial and radial forces and ensure stability.

[0026] In one embodiment, see Figure 1 and Figure 2 As shown, a polytetrafluoroethylene (PTFE) coating is applied above the V-groove. PTFE has an extremely low coefficient of friction, effectively reducing the frictional resistance between the stress ring and the V-groove during deformation under stress. This facilitates free deformation of the stress ring during measurement, preventing stress concentration or localized deformation caused by friction, thereby improving measurement accuracy, protecting the V-groove, and extending its service life. The PTFE coating also exhibits excellent wear resistance, reducing wear on the V-groove during long-term use and extending the fixture's lifespan. Furthermore, because PTFE is not easily corroded by chemicals, it also prevents moisture, oil, or other corrosive substances in the environment from damaging the V-groove.

[0027] In one embodiment, see Figure 1 and Figure 2 As shown, the micrometer 4 has a ball end face 41 at its bottom and a spherical groove 51 above the measuring connection part 5. The cooperation between the ball end face 41 and the spherical groove 51 can achieve a self-centering effect, ensuring that the measuring head of the micrometer 4 can always act perpendicularly on the measuring connection part 5, reducing measurement deviations caused by assembly errors. Since the traditional planar contact method may lead to unstable contact due to uneven stress distribution or small angular deviations during the measurement process, the structure of the ball end face 41 and the spherical groove 51 can automatically adjust the measuring axis, improving measurement stability.

[0028] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A measuring fixture for a stress ring, comprising a stress ring (1) to be tested, wherein a measuring clamp (3) is provided on the upper part of the stress ring (1), characterized in that, Fastening bolts (2) are movably connected to the stress ring (1) to be tested and the measuring clamp (3). A measuring micrometer (4) is provided at the bottom of the measuring clamp (3). A measuring connection part (5) is provided at the bottom of the measuring micrometer (4). The bottom of the measuring micrometer (4) is pressed against the measuring connection part (5). A round bar (6) is also provided between the stress ring (1) to be tested and the measuring clamp (3).

2. The stress ring measuring fixture according to claim 1, characterized in that, The measuring micrometer (4) is detachably connected to the bottom of the measuring clamp (3).

3. The stress ring measuring fixture according to claim 1, characterized in that, The measuring clamp (3) has a V-groove on its upper part, and a round bar (6) is clamped on the upper part of the V-groove.

4. The stress ring measuring fixture according to claim 1, characterized in that, The measuring connection (5) is threaded onto the stress ring (1) to be tested.

5. The stress ring measuring fixture according to claim 3, characterized in that, A polytetrafluoroethylene coating is provided above the V-groove.

6. The stress ring measuring fixture according to claim 4, characterized in that, The micrometer (4) has a ball end face (41) at the bottom and a spherical groove (51) above the measuring connection part (5).

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