CN211122269U

CN211122269U - Variable-angle single-sided and double-sided shear test fixture

Info

Publication number: CN211122269U
Application number: CN201921752030.2U
Authority: CN
Inventors: 姜浩; 陈国�; 周通; 吴静; 于云飞; 李祥; 羊玉龙
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-07-28
Anticipated expiration: 2029-10-14

Abstract

The utility model provides a single two-sided shear test anchor clamps of variable angle, characterized by Y type anchor clamps (1) are located the top of shear test anchor clamps and are connected with universal tester, U type anchor clamps (2) symmetrical arrangement is in the both sides of shear test anchor clamps, T type anchor clamps (3) are located the bottom of shear test anchor clamps and are connected with universal tester, U type anchor clamps (2) and T type anchor clamps (3) pass through screw rod (5), nut (7) and gasket (8) link to each other, angle board (6) are located shear test anchor clamps middle part, angle board (6) and U type anchor clamps (2) are connected through locating pin (4), pilot pin (9) are located between T type anchor clamps (3) and nut (7), protractor (10) are located angle board (6) middle part. The utility model discloses cooperation universal tester uses, is particularly suitable for variable angle bamboo wood node shear test, has simple structure, the installation of being convenient for is dismantled, is favorable to improving experimental precision and efficiency.

Description

Variable-angle single-sided and double-sided shear test fixture

Technical Field

The utility model relates to a mechanical test tests technical field, concretely relates to single two-sided shear test anchor clamps of variable angle.

Background

The building industry in China is rapidly developed at present, but with the gradual serious environmental pollution, the attention of people to green and healthy bamboo and wood buildings is continuously increased, the development of the related technical field of the bamboo and wood buildings is also changed day by day, the test matched with the structural performance of the material is also required to be synchronously carried out, the connection is the key for ensuring that the two materials can well play the combined action, and the rigidity and the strength of the connection are the main parameters of the design of the combined structure.

At present, the mechanical properties of the composite structure connection are generally obtained through tests. Common test methods are single shear and shear tests. At present, detailed introduction of the variable-angle single-double-sided shear test clamp is not found in China, the existing clamp is poor in flexibility and single in form, namely when the size and the angle of a test piece are changed, the shear test clamp needs to be redesigned, and the installation and the disassembly are complex. Therefore, it is necessary to design a variable-angle single-double-sided shear test fixture capable of performing monotonous loading and cyclic loading.

SUMMERY OF THE UTILITY MODEL

The utility model provides a single two-sided shear test anchor clamps of variable angle, its purpose aims at remedying the vacancy of present internal circulation loading shear test anchor clamps, through the position of adjusting U type anchor clamps about the both ends screw rod from top to bottom to be applicable to the test piece of unidimensional and angle not.

The technical solution of the utility model is as follows: the universal testing machine is characterized in that the Y-shaped clamp is connected with the universal testing machine, a load is vertically applied to the Y-shaped clamp for testing, the U-shaped clamp is connected with the T-shaped clamp through a screw rod, the U-shaped clamp and the angle plate are connected through a positioning pin to play a role in fixing a test piece, the angle and the moment are effectively adjusted through scales shown by the angle plate and the positioning pin by moving the screw rod, and the lower portion of the T-shaped clamp is connected with the universal testing machine.

The basic principle of the utility model is as follows: load is applied by Y type anchor clamps and is tested, and Y type anchor clamps provide vertical load for the test piece, and U type anchor clamps provide the side direction restraint for the test piece, and T type anchor clamps provide vertical support and fixed U type anchor clamps for the test piece.

The diameter of a bolt hole reserved in two limbs of the Y-shaped clamp is 1.0-1.5 mm larger than the diameter of the positioning pin.

The U-shaped clamp is symmetrically arranged on two sides of the shear test clamp, and the diameter of a bolt hole reserved in two limbs of the U-shaped clamp is 1.0-1.5 mm larger than that of a positioning pin.

The side face of the T-shaped clamp is marked with dimension scales, oblong holes are reserved on two sides of the upper limb of the T-shaped clamp, and the hole diameter is 1.0-1.5 mm larger than the diameter of the screw.

The angle plate is characterized in that oblong holes are pre-drilled in two sides of the angle plate, the hole diameter is 1.0-1.5 mm larger than the diameter of the positioning pin, and a protractor is arranged in the middle of the angle plate.

The U-shaped clamp is connected with the angle plate through a positioning pin.

The U-shaped clamp and the T-shaped clamp are connected through a screw, a nut and a gasket.

The positioning pin is positioned between the T-shaped clamp and the nut.

The utility model has the advantages that: the shear test fixture is matched with a universal testing machine, is particularly suitable for variable-angle connection shear tests, can be adjusted according to the size and the angle of a test piece, and avoids the trouble of repeatedly manufacturing the shear test fixture. The Y-shaped clamp provides vertical load for the test piece, the U-shaped clamp provides lateral restraint for the test piece, and the T-shaped clamp provides vertical support for the test piece and fixes the U-shaped clamp, so that a cyclic loading test can be performed. The angle and the moment are controlled by the angle plate and the positioning pin, so that the test accuracy is improved.

Description of the drawings:

the drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention.

FIG. 1 is a schematic structural diagram of the present invention

FIG. 2 is a schematic view of the connection between the U-shaped clamp and the screw rod of the present invention

FIG. 3 is a schematic view of the middle angle plate of the present invention

FIG. 4 is a schematic view of the connection between the T-shaped clamp and the positioning pin of the present invention

FIG. 5 is the embodiment of the utility model provides an in the test piece and shear test anchor clamps connection sketch map

In the figure: the test piece comprises a Y-shaped clamp 1, a U-shaped clamp 2, a T-shaped clamp 3, a positioning pin 4, a screw rod 5, an angle plate 6, a nut 7, a gasket 8, a positioning pin 9, a protractor 10, a test piece 11

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings. As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the utility model provides a single two-sided shear test anchor clamps of variable angle comprises Y type anchor clamps, U type anchor clamps, T type anchor clamps, locating pin, screw rod, angle board, nut, gasket and pilot pin. In the shear test jig, a Y-shaped jig and a T-shaped jig are connected to a universal tester. The U-shaped clamp and the T-shaped clamp are connected through a screw rod, and the connection is fixed through a nut and a gasket. The adjusting screw rod reads the numerical values of the protractor and the scale lines to control the angle and the moment so as to meet the requirements of the test scheme.

All adopt Q235 steel preparation, adopt two-sided welding seam between anchor clamps steel, to T type anchor clamps, should arrange annular hole according to the change range of test scheme moment, consider experimental stability and accuracy nature, do not receive the deformation under the vertical load effect should be satisfied to the intensity of T type anchor clamps steel.

Example 1: the basic principle and the main structure are the same as the above, the shear test fixture is connected with a universal testing machine, as shown in fig. 5, a test piece is connected with the fixture through a positioning pin, and the collection conditions are set for carrying out a loading test until the test is finished.

Claims

1. The utility model provides a single two-sided shear test anchor clamps of variable angle, characterized by Y type anchor clamps (1) are located the top of shear test anchor clamps and are connected with universal tester, U type anchor clamps (2) symmetrical arrangement is in the both sides of shear test anchor clamps, T type anchor clamps (3) are located the bottom of shear test anchor clamps and are connected with universal tester, U type anchor clamps (2) and T type anchor clamps (3) pass through screw rod (5), nut (7) and gasket (8) link to each other, angle board (6) are located shear test anchor clamps middle part, angle board (6) and U type anchor clamps (2) are connected through locating pin (4), pilot pin (9) are located between T type anchor clamps (3) and nut (7), protractor (10) are located angle board (6) middle part.

2. The variable-angle single-double-sided shear test fixture as claimed in claim 1, wherein the bolt hole diameter reserved on two limbs of the Y-shaped fixture (1) is 1.0-1.5 mm larger than the diameter of the positioning pin (4).

3. The variable-angle single-double-sided shear test fixture as claimed in claim 1, wherein the U-shaped fixtures (2) are symmetrically arranged on two sides of the shear test fixture, and the diameter of a bolt hole reserved on two limbs of each U-shaped fixture (2) is 1.0-1.5 mm larger than that of the positioning pin (4).

4. The variable-angle single-double-sided shear test fixture as claimed in claim 1, wherein the side of the T-shaped fixture (3) is marked with dimension scales, oblong holes are reserved on two sides of the upper limb of the T-shaped fixture (3), and the hole diameter is 1.0-1.5 mm larger than the diameter of the screw (5).

5. The variable-angle single-double-sided shear test fixture according to claim 1, wherein the two sides of the angle plate (6) are pre-drilled with long circular holes, the hole diameter is 1.0-1.5 mm larger than the diameter of the positioning pin (4), and the protractor (10) is arranged in the middle of the angle plate (6).

6. The variable-angle single-double-sided shear test fixture of claim 1, wherein the U-shaped fixture (2) is connected with the angle plate (6) through a positioning pin (4).

7. The variable-angle single-double-sided shear test fixture of claim 1, wherein the U-shaped fixture (2) and the T-shaped fixture (3) are connected through a screw (5), a nut (7) and a gasket (8).

8. The variable-angle single-double-sided shear test fixture of claim 1, wherein the positioning pin (9) is positioned between the T-shaped fixture (3) and the nut (7).