CN206862763U - A kind of shearing test clamp - Google Patents

Abstract

The utility model belongs to mechanical property of materials experimental technique field, discloses a kind of shearing test clamp, including is fixedly connected with platform on testing machine for being fixed on, and is fixedly connected with platform and passes through chucking position adjustment bolt jockey base；Clamp base connects sample chuck by adjustment bolt above and below fixture；Sample chuck is provided with sample thickness adjustment bolt and sample compresses trimming bolt, sample thickness adjustment bolt is used to adjust shearing sample thickness and locked, sample compresses trimming bolt and is used to finely tune shearing sample thickness and locks, and shearing sample applies shear pressure by the integral type shear knife on testing machine output shaft.Shearing test clamp is made adjustable structure by the utility model, is capable of position, size and the thickness of alignment jig clamping sample, is expanded test scope；It is close to and is connect using bolt lock simultaneously, it is simple to operate, it is not easy to loosen, stability is high, it is proposed that the new approaches of shearing clamp controllability, tightness and reliability.

Description

A shear test fixture

technical field

The utility model belongs to the technical field of material mechanical performance testing, and in particular relates to a clamp capable of realizing a shearing test.

Background technique

Shear test can determine the resistance performance of materials under shear force, and is one of the basic test methods of material mechanical performance test, mainly used to test parts and materials subjected to shear load. The shear test fixture is the most basic and important part of the shear test.

At present, during the test process, as the shear force of the test continues to increase, the force on the fixture is also increasing, resulting in many problems; 1. The position of the fixture itself cannot be adjusted, 2. The fixture cannot be adjusted according to the size of the sample The range of clamping will cause the sample to loosen during the test and cause errors in the test data.

Utility model content

The utility model aims to solve the technical problem that the current shear test fixture cannot adjust the position and clamping range, and provides a new type of shear test fixture, which can adjust the clamping section, shear position and shear thickness according to the size of the sample. The adjustment can improve the test loading force, stability and reliability, and ensure that the sample will not relax during the test.

In order to solve the above technical problems, the utility model is realized through the following technical solutions:

A shear test fixture, comprising a fixed connection platform for fixed connection on a testing machine, the top surface of the fixed connection platform is provided with a long T-shaped section groove, and a T-shaped nut is arranged in the T-shaped section groove , used to connect the fixture base with the fixture position adjustment bolt;

The clamp base includes a flat plate portion and a vertical plate portion perpendicular to each other, and the flat plate portion of the clamp base is provided with a threaded hole for installing the clamp position adjustment bolt, and the bottom end of the clamp position adjustment bolt extends to the The T-shaped section groove of the fixed connection platform is screwed into the T-shaped nut, which is used to adjust and lock the position of the clamp base on the fixed connection platform; a threaded hole is provided in the middle of the vertical plate of the clamp base, It is used to connect the sample chuck by adjusting the bolt up and down by the fixture;

The sample chuck includes a vertical plate portion and a flat plate portion perpendicular to each other, and a vertical elongated hole is arranged in the middle of the lower portion of the vertical plate portion of the sample chuck, and the elongated hole is connected to the vertical plate portion of the clamp base. Align the threaded holes of the fixture and sequentially pass through the upper and lower adjustment bolts of the fixture. The upper and lower adjustment bolts of the fixture are used to adjust and lock the position of the vertical plate of the sample chuck relative to the vertical plate of the fixture base;

Bolt holes are provided in the middle of the upper part of the vertical plate of the sample chuck for installing sample thickness adjustment bolts, and the sample thickness adjustment bolts are used to adjust and lock the shear sample thickness; the sample chuck Bolt holes are provided in the middle of the flat plate for installing sample compression fine-adjustment bolts, and the sample compression fine-adjustment bolts are used to fine-tune the thickness of sheared samples and lock them;

The shear sample is placed on the top surface of the vertical plate of the fixture base, and the back is against the vertical plate of the sample clamp, and is pressed by the flat plate of the sample clamp; the shear test The sample is sheared by an integrated shearing knife installed on the output shaft of the testing machine.

Preferably, the flat plate part of the clamp base is provided with a protective boss at the junction of the clamp base and the vertical plate part, and the protective boss is located under the integrated shearing and pressing knife.

Preferably, the bottom surface of the flat plate part of the clamp base is provided with a positioning boss, and the positioning boss is embedded in the T-shaped section groove of the fixed connection platform.

Preferably, edge strips are provided on both sides of the back of the vertical plate of the fixture base for positioning and snapping the sample chuck in.

Preferably, a handle is provided on the outside of the up and down adjusting bolts.

The beneficial effects of the utility model are:

The utility model improves the previous fixture on the basis of the existing test equipment, breaks the conventional practice that the shear test has strict requirements on the sample, and makes the fixture into an adjustable structure, and the adjustment operation is convenient and effective, and can be used for different sizes. Adjust the position, size and thickness of the sample clamped by the fixture, thereby expanding the test range of the sample; at the same time, the fixture is connected by bolt locking, which not only saves complicated operation procedures, but also is not easy to loosen during the test, ensuring stability high. The utility model proposes a new idea of the adjustability, fastness and reliability of the shearing fixture, and is very suitable for popularization and application.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the shear test fixture provided by the utility model;

Fig. 2 is the front view of the shear test fixture provided by the utility model;

Fig. 3 is a side view of the shear test fixture provided by the utility model;

Fig. 4 is a structural schematic diagram of a fixedly connected platform;

Fig. 5 (a) is a side view of the clamp base, Fig. 5 (b) is a front view of the clamp base, Fig. 5 (c) is a top view of the clamp base, and Fig. 5 (d) is a schematic diagram of the three-dimensional structure of the clamp base;

Fig. 6 is a schematic structural view of the sample chuck;

Fig. 7 is the structural representation of shear sample;

Fig. 8 is a schematic diagram of the assembly structure of the shear test fixture and the sample provided by the utility model.

In the above figure: 1: Integrated shearing and pressing knife; 2: Fine-tuning bolt for sample compression; 3: Sample chuck;

4: Sample thickness adjustment bolt; 5: Fixture up and down adjustment bolt; 6: Fixture base; 7: Fixture position adjustment bolt;

8: fixed connection platform; 9: shear sample.

detailed description

In order to further understand the content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

As shown in Figures 1 to 3, this embodiment provides a shear test fixture, which is mainly composed of four parts: a fixed connection platform 8, a fixture base 6, a sample chuck 3, and an integrated shear press knife 1, and Cooperate with fixture position adjustment bolt 7, fixture up and down adjustment bolt 5, sample thickness adjustment bolt 4, sample compression fine-adjustment bolt 2 to realize the adjustable fixture structure.

As shown in FIG. 4 , the fixed connection platform 8 is located at the bottom of the shear test fixture, and its main body is a circular platform-like structure. The bottom surface of the fixed connection platform 8 is provided with four threaded holes for fixedly connecting the shear test fixture to the testing machine. The top surface of the fixed connection platform 8 is provided with a long T-shaped section groove, which is used to adjust the clamp base 6 in place and fix it on the top surface of the fixed connection platform 8 through the T-shaped nut and the clamp position adjustment bolt 7 .

As shown in FIG. 5( a ) to FIG. 5( d ), the clamp base 6 includes a flat plate portion and a vertical plate portion perpendicular to each other, and a protective boss is provided at the joint between the flat plate portion and the vertical plate portion. The flat part of the fixture base 6 is fixedly connected with the fixed connection platform 8, and a threaded hole is provided in the middle for installing the fixture position adjustment bolt 7. The bottom end of the fixture position adjustment bolt 7 extends into the T-shaped cross-sectional groove of the fixed connection platform 8 and Screw into the T-shaped nut, drive the T-shaped nut to slide in the T-shaped section groove of the fixed connection platform 8, and adjust the relative position of the fixture base 6 on the fixed connection platform 8, thereby realizing the adjustment of the clamped shear test. The relative position of the sample 9 and the integrated shearing press knife 1, after the shearing position is adjusted in place, the clamp position adjustment bolt 7 is tightened to complete the locking. The bottom surface of the flat part of the clamp base 6 can also be provided with a cylindrical positioning boss, which is embedded in the T-shaped section groove of the fixed connection platform 8, which can prevent offset when the clamp position adjustment bolt 7 is locked. effect. The top surface of the vertical plate part of the fixture base 6 is used to place the shear sample 9, and the two sides of the back are provided with clip edge strips for conveniently positioning and snapping the sample chuck 3 in. A threaded hole is provided in the middle of the vertical plate portion of the clamp base 6 for installing the vertical adjustment bolt 5 of the clamp. The protective boss is elongated and located under the integrated shearing press 1, which protects and supports the integrated shearing press 1 after the integrated shearing press 1 applies shear pressure to the shear sample 9. It can prevent the fixed connection platform 8 from being damaged due to excessive pressure during the pressing process of the integral shearing press knife 1 .

As shown in Figure 6, the sample holder 3 includes a vertical plate portion and a flat plate portion perpendicular to each other, wherein the vertical plate portion is used to support the shear sample 9, and the flat plate portion is used to compress the shear sample 9 . There is a vertical long hole in the middle of the lower part of the vertical plate of the sample chuck 3, and the long hole is aligned with the threaded hole on the vertical plate of the fixture base 6, and is used to adjust the bolts 5 up and down of the fixture in turn. Pass through the elongated hole and the threaded hole. By moving up and down the position of the vertical plate portion of the sample chuck 3 relative to the vertical plate portion of the fixture base 6, the clamping section can be adjusted according to the size of the sheared sample 9, and the clamping size is adjusted in place, and then the up and down adjustment bolts 5 are tightened That is, the locking is completed, and a handle can also be provided on the outside of the up and down adjustment bolt 5 to facilitate the screwing operation. There are two bolt holes in the middle of the upper half of the vertical plate of the sample chuck 3, which are used to install the sample thickness adjustment bolt 4. After the shear sample 9 is installed by using the upper and lower adjustment bolts 5, it can be cut The sample thickness adjustment bolt 4 on the back of the sample 9 adjusts the thickness of the shear sample 9 . There are two bolt holes in the middle of the flat part of the sample chuck 3, which are used to install the sample compression fine-adjustment bolt 2. After the thickness is adjusted, the sample compression fine-adjustment bolt 2 can be used to fine-tune the shear sample 9 further. The adjustment is locked. It can be seen that the upper and lower adjusting bolts 5 on the back play the role of adjusting the shearing sample 9 in a wide range, while the compression fine-tuning bolt 2 on the upper part can achieve the purpose of finely adjusting and locking the shearing sample 9 .

The integrated shear press knife 1 is installed on the output shaft of the testing machine when performing a shear test. After the shear sample 9 is installed, adjusted and fixed, shear pressure is applied to the shear sample 9 .

As shown in Figure 7 and Figure 8, utilize the shear test fixture of the present utility model to carry out shear test, operate according to the following steps:

1) After debugging the fatigue testing machine, open the testing software.

2) Paste together two boards with a length of 20mm, a width of 19mm, and a thickness of 3.5mm to make a shear sample 9, as shown in Figure 7; the thickness of the glue is 0.2mm, and the length of the pasting surface is 6mm.

3) Unscrew the upper and lower adjustment bolts 5 of the fixture, place the shear sample 9 on the fixture base 6, adjust the position of the sample chuck 3 according to the size of the shear sample 9, and adjust until the flat part of the sample chuck 3 Hold the shear sample 9, lock the fixture and adjust the bolt 5 up and down; adjust the thickness of the sample and adjust the bolt 4 to push the screw contact surface against the plane of the shear sample 9; press the sample to adjust the fine adjustment bolt 2 until the shear is locked Sample 9: adjust the clamp position adjustment bolt 7 to move the clamp base 6 to the position where the shear sample 9 is located at the position where pressure is applied by the integrated shear press knife 1, and lock the clamp position adjustment bolt 7.

4) Servo the integrated shear press knife 1 to the 0.1 mm of the contact surface of the shear sample 9, as shown in FIG. 8 .

5) Set up the experimental scheme and start the experiment.

Although the preferred embodiment of the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative and not restrictive. Under the enlightenment of the utility model, those of ordinary skill can also make many specific transformations without departing from the gist of the invention and the protection scope of the claims, and these all belong to the protection scope of the utility model.

Claims (5)

1. A shear test fixture, is characterized in that, comprises the fixedly connected platform that is used to be fixedly connected on the testing machine, and described fixedly connected platform top surface is provided with the T-shaped section groove of full length, and this T-shaped section groove There is a T-shaped nut inside, which is used to connect the fixture base with the fixture position adjustment bolt; The clamp base includes a flat plate portion and a vertical plate portion perpendicular to each other, and the flat plate portion of the clamp base is provided with a threaded hole for installing the clamp position adjustment bolt, and the bottom end of the clamp position adjustment bolt extends to the The T-shaped section groove of the fixed connection platform is screwed into the T-shaped nut, which is used to adjust and lock the position of the clamp base on the fixed connection platform; a threaded hole is provided in the middle of the vertical plate of the clamp base, It is used to connect the sample chuck by adjusting the bolt up and down by the fixture; The sample chuck includes a vertical plate portion and a flat plate portion perpendicular to each other, and a vertical elongated hole is arranged in the middle of the lower portion of the vertical plate portion of the sample chuck, and the elongated hole is connected to the vertical plate portion of the clamp base. Align the threaded holes of the fixture and sequentially pass through the upper and lower adjustment bolts of the fixture. The upper and lower adjustment bolts of the fixture are used to adjust and lock the position of the vertical plate of the sample chuck relative to the vertical plate of the fixture base; Bolt holes are provided in the middle of the upper part of the vertical plate of the sample chuck for installing sample thickness adjustment bolts, and the sample thickness adjustment bolts are used to adjust and lock the shear sample thickness; the sample chuck Bolt holes are provided in the middle of the flat plate for installing sample compression fine-adjustment bolts, and the sample compression fine-adjustment bolts are used to fine-tune the thickness of sheared samples and lock them; The shear sample is placed on the top surface of the vertical plate of the fixture base, and the back is against the vertical plate of the sample clamp, and is pressed by the flat plate of the sample clamp; the shear test The sample is sheared by an integrated shearing knife installed on the output shaft of the testing machine. 2. A shear test fixture according to claim 1, characterized in that, the flat part of the fixture base is provided with a protective boss at the connection between it and the vertical plate part, and the protective boss is located on the Underneath the integrated shear press. 3. A shear test fixture according to claim 1, characterized in that, the bottom surface of the flat plate part of the fixture base is provided with a positioning boss, and the positioning boss is embedded in the T-shaped section groove of the fixed connection platform . 4 . The shear test fixture according to claim 1 , characterized in that, two sides of the back side of the vertical plate portion of the fixture base are provided with clamping strips for positioning and clamping the specimen clamp. 5 . 5 . The shear test fixture according to claim 1 , wherein a handle is provided on the outside of the up and down adjusting bolts. 6 .