CN218481323U - Sample centering anchor clamps for tensile test - Google Patents

Abstract

The utility model discloses a sample centering fixture for tensile test, including last pin, entablature, montant, bottom end rail, lower pin and the collet that connect gradually from top to bottom, go up pin, lower pin and montant all vertical setting, entablature, bottom end rail and collet all horizontal setting; the upper cross beam and the lower cross beam are equal in length and are oppositely arranged, the upper stop lever and the lower stop lever are positioned on the same vertical surface, and the bottom support is positioned on one side, away from the lower cross beam, of the bottom of the lower stop lever; centering anchor clamps simple structure, test convenience only need select corresponding centering anchor clamps according to the width of testing machine clamp splice, the length of sample, width and thickness data during the test, and the centering anchor clamps that will be equipped with the sample put into the testing machine clamp splice, and the centering anchor clamps of taking off after pressing from both sides tightly can test, need not other operations at the in-process, have effectively reduced the influence of personnel's operation to test data.

Description

Sample centering clamp for tensile test

[ technical field ] A

The utility model belongs to testing machine test field, concretely relates to sample centering anchor clamps for tensile test.

[ background of the invention ]

When the composite material is subjected to a tensile test, a sample is required to be clamped in the middle of a clamp block of a testing machine, so that the high centering degree of the tensile sample and a loading center of the testing machine is ensured, and the problem that the sample is damaged in advance or an unreasonable damage mode is generated to influence the accuracy of a test result due to additional bending or shearing force brought to the sample is avoided; therefore, when performing a composite tensile test, it is required to use a centering jig to ensure that the sample main shaft is aligned with the sample extending direction along the center line between the jigs.

At present, a common centering method in the process of tensile test comprises manual visual centering or L-shaped ruler centering, but during manual visual centering, multiple times of adjustment are needed, more artificial influence factors exist, the centering effect is not ideal, the deviation of two ends of a sample is large, and final test data is influenced.

The L-shaped ruler is adopted for centering, and the following defects exist in the actual tensile test process: the L-shaped ruler is easy to shift or deform in the test process, so that the centering function is lost; and when testing different sizes of samples, the symmetry of the upper clamping block and the lower clamping block of the centering L-shaped ruler on the actuating cylinder needs to be calibrated again, the whole process has more operation steps, more artificial influence factors, longer loss time of the calibrated L-shaped ruler and inaccurate symmetry.

[ Utility model ] content

The utility model discloses a solve the problem that adopts "L" type chi centering to exist among the prior art, provide a simple structure, to the centering degree high, change convenient sample centering anchor clamps for tensile test.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a sample centering anchor clamps for tensile test, includes last pin, entablature, montant, bottom end rail, lower pin and the collet that connects gradually, go up the vertical setting of pin, lower pin and montant, entablature, bottom end rail and collet all transversely set up, the entablature equals and sets up relatively with the length of bottom end rail, it is located same vertical face with lower pin to go up the pin, the collet is located one side that the bottom end rail was kept away from to the bottom of bottom end rail.

Preferably, an upper stop block is fixedly arranged at the top of the upper cross beam, and the upper stop block is horizontally vertical to the upper cross beam.

Preferably, a lower stop block is fixedly arranged at the bottom of the lower cross beam, and the lower stop block is horizontally vertical to the lower cross beam.

Preferably, the distance between the upper stop block and the upper stop rod and the distance between the lower stop block and the lower stop rod are equal and equal to the width of the clamping block of the testing machine/2-the width of the sample to be tested/2-the width of the upper stop rod (lower stop rod), so that the center line of the sample to be tested is ensured to coincide with the center line of the clamping block.

Preferably, the length of the upper stop lever is equal to that of the lower stop lever, and is consistent with the length of the clamped sample to be tested.

Preferably, the length of the bottom support is not less than the width of the clamped part of the end of the sample to be tested.

Preferably, the thickness of the centering fixture except the upper stop block and the lower stop block is not more than that of the sample to be measured.

Preferably, the centering clamp is made of metal materials, so that the centering clamp is easy to machine and replace and low in maintenance cost.

Compared with the prior art, the utility model discloses following beneficial effect has:

the centering fixture of the utility model has simple structure and convenient test, and can be used for testing only by selecting the corresponding centering fixture according to the width of the clamping block of the testing machine, the length of the sample, the width and the thickness data, putting the centering fixture with the sample into the clamping block of the testing machine, and taking down the centering fixture after clamping, without other operations in the process, thereby effectively reducing the influence of personnel operation on the test data;

the arrangement of the stop block in the centering fixture can ensure that the central line of the sample is always coincided with the central line of the clamping block in the clamping process of the clamping block of the testing machine, so that the whole sample is completely in the optimal stress condition of the testing machine to carry out load damage;

use after the centering anchor clamps test, the destroyed load stability and the tensile strength stability of sample all improve to some extent.

[ description of the drawings ]

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the centering jig of the present invention;

fig. 2 is a schematic diagram of the alignment fixture and the fixture block of the testing machine of the present invention;

wherein, 1-an upper stop lever; 2-upper beam; 3-vertical rod; 4-a lower cross beam; 5-a lower stop lever; 6-bottom support; 7-an upper stop block; 8-a lower stop block; 9-clamping block of testing machine.

[ detailed description ] embodiments

To make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and specific embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, the utility model provides a sample centering fixture for tensile test, including upper stop lever 1, upper crossbeam 2, montant 3, lower beam 4, lower stop lever 5 and collet 6 that set gradually from top to bottom, upper stop lever 1 is vertical to be set up, and upper crossbeam 2 is horizontal to be connected on the right side of the lower extreme of upper stop lever 1, montant 3 is vertical to be connected at the right-hand member of upper crossbeam 2, lower beam 4 is horizontal to be connected on the left side of the lower extreme of montant 1, and lower stop lever 5 is vertical to be connected at the left end of lower beam, collet 6 is horizontal to be connected on the left side of the lower extreme of lower stop lever 5; all parts are connected in sequence to form a structure with a convex middle part.

The length (height in the vertical direction) of the upper stop lever 1 is equal to that of the lower stop lever 5, and is equal to the length of a sample to be tested (or is equal to that of a sample reinforcing sheet to be tested); the length of the bottom support 4 is not less than the width of the clamped part of the end part of the sample to be measured.

An upper stop block 7 is fixedly arranged at the top of the upper cross beam 2, and the upper stop block 7 is horizontally vertical to the upper cross beam 2; a lower stop block 8 is fixedly arranged at the bottom of the lower cross beam 4, and the lower stop block 8 is horizontally vertical to the lower cross beam 4; during testing, the upper stop block 7 and the lower stop block 8 are respectively tightly attached to the surfaces of the upper clamping block and the lower clamping block of the testing machine, so that the depth of the upper stop block and the depth of the lower stop block in the clamping blocks are consistent, and the central line of the sample strip is consistent with the central line of the clamping blocks.

The length of the upper cross beam 2 is equal to that of the lower cross beam 4, so that the upper stop lever 1 and the lower stop lever 5 are located on the same vertical surface, the distance between the upper stop dog 7 and the upper stop lever 1 and the distance between the lower stop dog 8 and the lower stop lever 5 are equal to the width of a test machine clamping block/2-the width of a test sample to be tested/2-the width of the upper stop lever (lower stop lever), and the width of the upper stop lever is equal to that of the lower stop lever.

In this embodiment the distance between the upper beam and the upper stop block is kept away from upper stop rod one end and the distance between the lower beam and the lower stop block is 5cm, is convenient for take out.

Preferably, except for upper stop block and lower stop block, the thickness of all the other structures in the centering fixture is not more than the thickness of the sample to be measured.

Preferably, the centering fixture of the present invention may be integrally formed, or each part of the structure may be separately prepared, and then each part of the structure is fixedly connected; the centering clamp can be made of metal materials such as stainless steel and alloy.

As shown in fig. 2, when in use, a proper centering fixture is selected according to the width of the clamping block of the testing machine and the size of a sample to be tested, the sample to be tested is placed into the centering fixture (the top of the bottom support 6, and the side surface of the sample to be tested is contacted with the side surfaces of the upper stop lever 1 and the lower stop lever 5), and the clamping force of the actuating cylinder is adjusted;

adjusting the positions of the upper clamping block and the lower clamping block of the testing machine to meet the initial distance of the length test of the sample;

placing the centering fixture with the sample between the upper clamping block and the lower clamping block, and enabling the upper stop dog 7 and the lower stop dog 8 of the centering fixture to be respectively attached to the side surfaces of the upper clamping block and the lower clamping block, so as to ensure that the depth of the upper stop dog and the lower stop dog in the clamping blocks is consistent, and further ensure that the center line of the sample strip is consistent with the center line of the clamping blocks;

adjusting the clamping force of the clamping block to enable the clamping block to clamp the sample to be tested, and then taking down the centering fixture;

and pre-loading and zero clearing are carried out on the testing machine, parameters are set, the test is started, and data such as displacement and force of the testing machine are recorded.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims (7)

1. A sample centering clamp for a tensile test is characterized by comprising an upper stop lever, an upper cross beam, a vertical rod, a lower cross beam, a lower stop lever and a bottom support which are sequentially connected from top to bottom, wherein the upper stop lever, the lower stop lever and the vertical rod are vertically arranged, and the upper cross beam, the lower cross beam and the bottom support are transversely arranged; the length of entablature and bottom end rail equals and sets up relatively, go up pin and down the pin and be located same vertical face, the collet is located one side that the bottom of pin kept away from the bottom end rail down.

2. The specimen centering fixture for the tensile test according to claim 1, wherein an upper stopper is fixedly arranged at the top of the upper cross beam, and the upper stopper is horizontally and vertically arranged with the upper cross beam.

3. The specimen centering fixture for the tensile test as claimed in claim 2, wherein a lower stop is fixedly arranged at the bottom of the lower beam, and the lower stop is horizontally and vertically arranged with the lower beam.

4. The specimen centering fixture for the tensile test according to claim 3, wherein the distance between the upper stopper and the upper stopper is equal to the distance between the lower stopper and the lower stopper, and is equal to the width of the tester clamping block/2-the width of the specimen to be tested/2-the width of the upper stopper, and the width of the upper stopper is equal to the width of the lower stopper.

5. The specimen centering fixture for the tensile test as claimed in claim 1, wherein the upper stop lever and the lower stop lever have the same length and are consistent with the length of the specimen to be tested.

6. The specimen centering jig for tensile testing as claimed in claim 1, wherein the length of said collet is not less than the width of the gripped portion of the end of the specimen to be tested.

7. The test specimen centering clamp for the tensile test as claimed in claim 3, wherein the thickness of the other structures except the upper stopper and the lower stopper is not more than the thickness of the test specimen to be tested.

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