Centering tool for installed anti-instability tool test sample

Abstract

The utility model discloses a centering tool for an installed anti-instability tool test sample, which comprises a sample positioning block, two clamping mechanisms are respectively arranged on two sides of the sample positioning block, centering positioning is further arranged on the clamping mechanisms, the number of the clamping mechanisms is two, and the two clamping mechanisms are respectively positioned at two ends of the sample positioning block and are symmetrically arranged; the two clamping mechanisms located at the same end are attached to each other. The centering tool provided with the anti-instability tool test sample is used, so that the centering precision of the tension and compression fatigue test sample can be improved, and the problem that the real performance of a material cannot be reflected due to the fact that the sample is damaged in advance is solved; a sample can be loaded quickly, and the problem of low efficiency caused by loading, unloading and adjusting a middle scale is solved; and the test personnel can be protected to a certain extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of material fatigue performance testing tooling, in particular to a centering tooling installed with an anti-instability tooling test specimen. Background Art

[0002] Composite material testing is now very widespread. During the composite material testing process, the impact of various factors on the test data should be reduced as much as possible to obtain data that can reflect the performance of the material itself.

[0003] According to GB / T35465.4, fiber-reinforced composite materials need to undergo tension-compression and compression-compression fatigue tests. The specimen used is a four-sided curved fatigue specimen. In order to ensure that the specimen does not twist or slip during the test, an anti-instability tooling is required.

[0004] Similarly, in the tension-compression fatigue test of metal materials, the flat specimen is prone to bending instability during the compression stage, which in turn affects the accuracy of the test data, so the specimen needs to be supported to prevent instability. At present, the known anti-instability fixture for fatigue testing is composed of a support block and bolts.

[0005] According to GB / T35465.4, if Figure 1 As shown, the structure of the anti-instability fixture includes two sets of rigid parts 71 and elastic parts 72 located on both sides of the specimen. The elastic part 72 is made of a material with good toughness such as silicone rubber, which fits the arc surface of the working section of the specimen. The rigid parts 71 and elastic parts 72 on both sides are locked by bolts 73.

[0006] During fatigue testing, the impact of specimen alignment on life is obvious. Before testing, the specimen needs to be accurately loaded into the fixture to ensure that the standard specimen is well aligned in the fixture, that is, to maintain good coaxiality during the test. Otherwise, uneven force and stress concentration may occur during material testing, causing the specimen to be damaged prematurely before reaching its limit, which will have a certain impact on the data.

[0007] At present, in tension-compression and compression-compression fatigue tests, an anti-instability fixture is used to prevent the specimen from buckling. The specimen with the anti-instability fixture is usually short, resulting in less available space for the upper and lower actuators, making it difficult for testers to operate the centering. The current ruler centering method uses bolts to fix the L-shaped ruler on the top of the clamping surface, which has the following disadvantages in actual operation:

[0008] 1) The operating space is small, which may cause certain safety hazards;

[0009] 2) During the experiment, the ruler will wear the sample to a certain extent, which may cause stress concentration problems;

[0010] 3) The scale is difficult to adjust during use, resulting in low centering;

[0011] 4) Loading and unloading the ruler reduces the experimental efficiency;

[0012] 5) Infrared projection alignment does not cause wear to the sample, but it also places higher demands on the tester.

[0013] Based on the above problems, it is necessary to design a centering device based on the installed anti-instability tooling test specimen to reduce the impact of the specimen centering problem on the test results. Utility Model Content

[0014] In order to solve the deficiencies of the prior art, the utility model provides a centering tool for installing an anti-instability tool test specimen, which can achieve fast and accurate centering and improve the efficiency and accuracy of material fatigue testing.

[0015] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0016] A centering fixture for a test specimen of an anti-instability fixture installed, comprising a specimen positioning block;

[0017] Two mutually symmetrical clamping mechanisms are arranged on both sides of the sample positioning block for clamping the sample; the clamping mechanisms include arm support blocks, which are fixed on both sides of the sample positioning block;

[0018] The clamping mechanism is also provided with a centering positioner, which is fixedly arranged at the outer end of the arm support block; the four centering positions are located on the same plane;

[0019] There are two sets of clamping mechanisms, which are located at the two ends of the sample positioning block and are symmetrically arranged.

[0020] The centering position is perpendicular to the flat plate of the arm support block.

[0021] Preferably, the sample positioning block is arranged vertically, and the arm support block is arranged horizontally.

[0022] Preferably, an elastic clamp block is provided inside the arm support block for non-destructive clamping of the sample, and the elastic clamp block may be made of highly elastic materials such as silicone and rubber.

[0023] Since highly elastic materials are prone to aging and losing their elasticity, a detachable connecting piece is provided between the arm support block and the elastic clamping block.

[0024] In the embodiment of the utility model, the detachable connecting member is a slider, the slider and the arm support block are interlocked with each other through a concave-convex groove structure, and the elastic clamp block is fixed on the slider. This structure can also make the device suitable for samples of different thicknesses by replacing elastic clamp blocks of different thicknesses.

[0025] Preferably, the elastic clamp block and the slider may be fixed by bonding or screws.

[0026] As a preferred embodiment, the inner ends of the elastic clamps on both sides fit each other, the outer ends of the slider and the elastic clamps are arc-shaped, and the outer ends of the elastic clamps of the two clamping mechanisms at the same end are open, which is convenient for sample placement.

[0027] In order to coordinate the positional relationship between the sample and the fixture, the sample positioning block is an arched structure.

[0028] The centering surface is flat and is used for fitting at right angles to the fixture.

[0029] Compared with the prior art, the beneficial effects of the utility model are:

[0030] 1) Use the centering fixture of the test specimen with the anti-instability fixture installed to improve the centering accuracy of the tensile-compression and compression-compression fatigue test specimens, and solve the problem of not being able to reflect the true performance of the material due to premature damage of the specimen;

[0031] 2) Using the centering fixture with the anti-instability fixture installed to test the specimen, the specimen can be loaded quickly, solving the problem of inefficiency caused by loading and unloading and adjusting the centering scale;

[0032] 3) The use of centering fixtures for test specimens with anti-instability fixtures installed can protect test personnel to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0034] Figure 1 This is a schematic diagram of the anti-instability tooling structure in GB / T35465.4;

[0035] Figure 2 A schematic diagram of the centering tool structure provided in Example 1 of the utility model;

[0036] Figure 3 Schematic diagram of the state of fixing the specimen with the anti-instability fixture;

[0037] Figure 4 This is a schematic diagram of the working status of the centering tooling provided in Example 1 of the utility model.

[0038] Among them, 1-centering positioning, 2-specimen positioning block, 3-arm support block, 4-slider, 5-elastic clamp block, 6-specimen, 7-anti-instability tooling, 8-clamp.

[0039] 71-rigid part, 72-elastic part, 73-bolt. DETAILED DESCRIPTION

[0040] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Example 1, a centering tool with an anti-instability tool test specimen installed

[0043] like Figure 2 As shown, it includes a sample positioning block 2, arm support blocks 3 fixedly connected to the sample positioning block 3 are respectively arranged on both sides of the sample positioning block 2, the arm support blocks 3 on both sides are symmetrically arranged, and sliders 4 and elastic clamping blocks 5 connected to the arm support blocks 3 are respectively arranged on both sides of the arm support blocks 3, a track matching with the slider 3 is arranged on the inner side of the arm support block 3 for the slider 3 to move, and the elastic clamping block 5 is fixed on the slider 4 on the same side, and the fixing method can be adhesive fixation or screw fixation.

[0044] like Figure 2 As shown, the sample positioning block 2 is arranged vertically, and the arm support block 3 is arranged horizontally.

[0045] A centering positioner 1 is provided at one end (outer end) of the arm support block 3 facing away from the sample positioning block 2. The centering positioner 1 is a flat plate perpendicular to the arm support block and is used to limit the position of the fixture. The four centering positioners 1 are located on the same plane.

[0046] The surface of the centering positioning 1 is flat and is used for fitting and positioning at right angles to the fixture.

[0047] As an implementation mode, there are concave-convex grooves between the arm support block 3 and the slider 4, which can be interlocked and locked with each other, so that the elastic clamp block 5 due to aging or different thicknesses can be quickly replaced.

[0048] As a preferred embodiment, the inner ends of the elastic clamping blocks 5 on both sides fit together to fasten the sample between the arm support blocks 3 on both sides. The outer ends of the slider 4 and the elastic clamping blocks 5 are arc-shaped, and the outer ends of the elastic clamping blocks 5 on both sides are open, which is convenient for placing the sample.

[0049] As an implementation mode, the arm support block and other components arranged thereon are two sets, which are symmetrically arranged at both ends of the sample positioning block 2.

[0050] The elastic clamp block 5 may be made of highly elastic materials such as silicone and rubber.

[0051] In order to match the position relationship between the specimen and the fixture, such as Figure 2 As shown, the sample positioning block 3 is a bow-shaped structure.

[0052] Example 2, test structure

[0053] like Figure 3 As shown, before the test, the sample 6 is placed in the anti-instability fixture 7 and locked.

[0054] like Figure 4 As shown, the sample with the anti-instability fixture is placed between the upper and lower pairs of elastic clamping blocks 5, and the sample is clamped by the elastic clamping blocks to prevent the sample from shaking back and forth.

[0055] The specimen is pressed against the specimen positioning block 2 and the specimen is installed on the centering fixture.

[0056] The anti-instability tool 7 can be placed between the arm support blocks 3, and the centering tool for placing the sample can be placed between the fixtures by relying on the arm support blocks 3. At this time, the tester does not need to put his hands between the upper and lower devices (actuating cylinders), reducing personal injuries caused by equipment reasons (such as overshoot).

[0057] The sample is centered on the fixture 8 by means of the centering positioning 1 and the right angle of the fixture. After the fixture clamps the sample, the centering tool is pulled out.

[0058] The utility model provides a use of a centering tool for testing a sample with an installed anti-instability tool, which uses the side of a device fixture as a reference surface for sample loading and centering, thereby improving the accuracy of sample centering and being able to better reflect the true performance of the material.

[0059] The use of this alignment tool saves time for scale adjustment and loading and unloading, and improves work efficiency.

[0060] The use of this centering fixture can avoid the harm to the operator caused by overshoot of the actuator due to abnormalities in procedures, equipment, etc. during the movement of the actuator, thereby reducing the operating risks.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A centering fixture with an anti-instability fixture test specimen installed, characterized in that: Including a specimen positioning block; Two symmetrical clamping mechanisms are arranged on both sides of the sample positioning block to clamp the sample; The clamping mechanism comprises an arm support block, which is fixed on both sides of the sample positioning block; The clamping mechanism is also provided with a centering positioner, which is fixedly arranged at the outer end of the arm support block; There are two sets of clamping mechanisms, which are located at the two ends of the sample positioning block and are symmetrically arranged.

2. The centering tool according to claim 1, characterized in that: The centering positioning member is a flat plate that is perpendicular to the arm support block, and the four centering positioning members are located on the same plane.

3. The centering tool according to claim 2, characterized in that: The sample positioning block is arranged vertically, and the arm support block is arranged horizontally.

4. The centering tool according to claim 2, characterized in that: An elastic clamping block is arranged inside the arm support block, and the elastic clamping block is made of elastic material.

5. The centering tool according to claim 4, characterized in that: A detachable connecting piece is arranged between the arm support block and the elastic clamp block.

6. The centering tool according to claim 5, characterized in that: The detachable connecting piece is a slider, the slider and the arm support block are interlocked with each other through a concave-convex groove structure, and the elastic clamp block is fixed on the slider.

7. The centering tool according to claim 6, characterized in that: The elastic clamp block and the sliding block are fixed by bonding or screws.

8. The centering tool according to claim 6, characterized in that: The inner ends of the elastic clamping blocks of the two clamping mechanisms located at the same end are fitted to each other, the outer ends of the slider and the elastic clamping block are in arc shape, and the outer ends of the elastic clamping blocks on both sides are in an open shape.

9. The centering tool according to claim 1, characterized in that: The sample positioning block is an arched structure.

10. The centering tool according to claim 1, characterized in that: The centering surface is flat.

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