Compression experiment tool for carbon fiber pultrusion whole plate in carbon fiber material detection

Abstract

The utility model belongs to the technical field of compression experiments, and particularly discloses a carbon fiber pultrusion whole plate compression experiment tool in carbon fiber material detection, which comprises an upper connecting assembly, an upper clamping assembly and a lower clamping assembly, the upper side of the upper connecting assembly is connected with a testing machine, and the lower side of the upper connecting assembly is connected with the upper clamping assembly; the upper connecting assembly can drive the upper clamping assembly to be close to or away from the lower clamping assembly, and the upper clamping assembly and the lower clamping assembly directly face each other. The upper clamping assembly and the lower clamping assembly each comprise a base, a driving part, a movable chuck and a fixed chuck, the movable chucks and the fixed chucks are arranged in the left-right direction, the driving parts are installed on the bases, the fixed chucks are fixed to the bases, and the driving parts are used for driving the movable chucks to be close to or away from the fixed chucks. And the fixed chuck and the movable chuck are used for clamping two sides of a test piece. The two sides of the test piece are clamped respectively, so that the condition that the test piece slides in the experiment process is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of compression testing technology, and in particular relates to a compression testing fixture for carbon fiber pultruded whole plate in carbon fiber material testing. Background Technology

[0002] Carbon fiber material testing refers to the scientific and systematic testing and evaluation of the properties of carbon fibers and their composites to ensure they meet specific application requirements. Carbon fiber material testing includes mechanical property testing, thermal property testing, and chemical property testing. Mechanical property testing includes tensile strength, compressive strength, flexural strength, shear strength, and impact strength, used to evaluate the load-bearing capacity and deformation capacity of carbon fiber materials. When testing compressive strength, reinforcing sheets are attached to the top and bottom sides of the carbon fiber pultruded sheet to form a specimen, and then a compression test is performed on the specimen. Compression testing fixtures are required for the compression test.

[0003] Current compression testing fixtures are difficult to position the specimen stably, and specimen slippage is likely to occur, thus affecting the experimental data. Utility Model Content

[0004] The purpose of this invention is to provide a compression test fixture for carbon fiber pultrusion molding whole plate in carbon fiber material testing, so as to solve the problem that the current compression test fixture is difficult to stably position the specimen and is prone to specimen slippage, which affects the experimental data.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing, comprising an upper connecting assembly, an upper clamping assembly, and a lower clamping assembly. The upper side of the upper connecting assembly is connected to the testing machine, and the lower side of the upper connecting assembly is connected to the upper clamping assembly. The upper connecting assembly can drive the upper clamping assembly to move closer to or away from the lower clamping assembly. The upper clamping assembly and the lower clamping assembly are directly opposite each other. Each of the upper clamping assembly and the lower clamping assembly includes a base, a driving component, a movable clamp, and a fixed clamp. The movable clamp and the fixed clamp are arranged horizontally. The driving component is mounted on the base, and the fixed clamp is fixed on the base. The driving component is used to drive the movable clamp to move closer to or away from the fixed clamp. The fixed clamp and the movable clamp are used to clamp both sides of the specimen.

[0006] Furthermore, a positioning plate is provided on the side of the fixed chuck near the movable chuck, and a positioning pin is threadedly connected to the positioning plate. The moving direction of the positioning pin is perpendicular to the moving direction of the movable chuck. The thickness of the positioning plate in the clamping direction of the fixed chuck and the movable chuck is less than the thickness of the specimen. The positioning pin is used to position the specimen in the front-back direction.

[0007] Furthermore, the base of the lower clamping assembly is provided with a guide rod, and the base of the upper clamping assembly is provided with a vertical guide hole, and the guide rod is slidably connected in the guide hole.

[0008] Furthermore, the upper connecting assembly includes a top plate and a connecting structure. The top plate is fixed on the base of the upper clamping assembly, and the connecting structure is used to connect the top plate and the crossbeam of the testing machine. The bottom of the top plate can abut against the top of the specimen.

[0009] Furthermore, the connecting structure includes a connecting rod and a pressure plate, the lower side of the pressure plate being connected to the upper side of the top plate; the upper side of the connecting rod being connected to the crossbeam of the testing machine, the lower side of the connecting rod being provided with a spherical pressure head, and the upper side of the pressure plate being provided with a groove matching the spherical pressure head.

[0010] Furthermore, it also includes a first gasket, a second gasket, and a third gasket, wherein multiple sets of the first gasket, the second gasket, and the third gasket are provided and have different thicknesses; the first gasket is used to be installed on the side of the movable chuck near the fixed chuck, the second gasket is used to be installed on the side of the fixed chuck near the movable chuck, and the third gasket is used to be installed at the lower end of the base of the upper clamping assembly.

[0011] Furthermore, the connecting structure is located at the center of the top plate.

[0012] Furthermore, the driving component is a hydraulic cylinder, which is connected to a hydraulic pump, and a pressure gauge is connected to the hydraulic pump.

[0013] The working principle of this technical solution is as follows: The specimen is placed vertically between the fixed chuck and the movable chuck, and the positioning pin is adjusted according to the width of the specimen, with the rear side of the specimen abutting against the positioning pin, so that the specimen is on the axis of the testing machine in the front-back direction. Different thicknesses of the first and second shims can be selected according to the thickness of the specimen, thus ensuring that the specimen is on the axis of the testing machine in the left-right direction. Different thicknesses of the third shim can be selected according to the length of the specimen, thus ensuring that the movable and fixed chucks can clamp the specimen to the maximum extent on both sides. First, the drive mechanism of the lower clamping assembly is activated, causing the drive mechanism to move the movable chuck towards the fixed chuck until the lower side of the specimen is clamped. Then, the testing machine is started, and the testing machine drives the pressure plate and top plate downwards via the connecting rod. The top plate drives the base of the upper clamping assembly downwards, and the base drives the movable and fixed chucks of the upper clamping assembly downwards until the top plate abuts against the upper side of the specimen. Then, the drive mechanism of the upper clamping assembly is activated, causing the drive mechanism to move the movable chuck towards the fixed chuck until the specimen is clamped.

[0014] The beneficial effects of this technical solution are as follows:

[0015] ① This technical solution avoids slippage of the specimen during the experiment by clamping it on both sides.

[0016] ②This technical solution, by setting first and second shims of different thicknesses, can adapt to specimens of different thicknesses and ensure that the center of the specimen is on the axis.

[0017] ③ This technical solution ensures that the movable clamp and the fixed clamp can clamp the specimen to the maximum extent by setting third shims of different thicknesses.

[0018] ④ This technical solution ensures that the pressure can automatically press down along the axis of the testing machine during the compression process by setting a spherical pressure head on the connecting rod and a groove on the pressure plate.

[0019] ⑤ This technical solution allows for real-time monitoring of pressure by setting a pressure gauge, thereby ensuring consistent pressure application each time.

[0020] ⑥ This technical solution, by setting guide rods and guide holes, can ensure the accuracy of the vertical movement of the upper clamping component.

[0021] ⑦ This technical solution, by setting a positioning pin, can adjust the position of the specimen in the front-back direction, ensuring that the specimen is on the axis of the testing machine in the front-back direction, and can adapt to specimens of different widths. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the carbon fiber pultrusion molding whole plate compression test fixture used in the carbon fiber material testing of this utility model. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] The reference numerals in the accompanying drawings include: upper connecting assembly 1, upper clamping assembly 2, lower clamping assembly 3, connecting rod 4, spherical pressure head 5, pressure plate 6, top plate 7, guide rod 8, base 9, driving component 10, movable clamp 11, fixed clamp 12, and specimen 13.

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The basic implementation examples are as follows: Figure 1The carbon fiber pultrusion molding whole plate compression test fixture shown is used in carbon fiber material testing. It includes an upper connecting assembly 1, an upper clamping assembly 2, and a lower clamping assembly 3. The upper side of the upper connecting assembly 1 is connected to the testing machine, and the lower side of the upper connecting assembly 1 is connected to the upper clamping assembly 2. The upper connecting assembly 1 can move the upper clamping assembly 2 closer to or further away from the lower clamping assembly 3. The upper connecting assembly 1 includes a top plate 7 and a connecting structure. The two sides of the top plate 7 are fixed to two sets of bases 9 of the upper clamping assembly 2. The connecting structure connects the top plate 7 and the crossbeam of the testing machine. The connecting structure is located at the center of the top plate 7 and includes a connecting rod 4 and a pressure plate 6. The lower side of the pressure plate 6 is connected to the upper side of the top plate 7. The upper side of the connecting rod 4 is connected to the crossbeam of the testing machine. A spherical indenter 5 is provided on the lower side of the connecting rod 4, and a groove matching the spherical indenter 5 is provided on the upper side of the pressure plate 6. The bottom of the top plate 7 can abut against the top of the specimen 13.

[0027] The upper clamping assembly 2 and the lower clamping assembly 3 face each other. Both assemblies include a base 9, a drive component 10, a movable clamp 11, and a fixed clamp 12. Two sets of bases 9 are provided, and the two sets of bases 9 in the lower clamping assembly 3 are fixed to the base plate. The movable clamp 11 and the fixed clamp 12 are arranged horizontally. The drive component 10 is mounted on the left base 9, and the fixed clamp 12 is fixed on the right base 9. The drive component 10 drives the movable clamp 11 to move closer to or away from the fixed clamp 12, thereby clamping the specimen 13. The drive component 10 is a hydraulic cylinder, and both the upper clamping assembly 2 and the lower clamping assembly 3 include three sets of hydraulic cylinders. The hydraulic cylinders are connected to a hydraulic pump, and a pressure gauge is connected to the hydraulic pump. The fixed clamp 12 and the movable clamp 11 are used to clamp the left and right sides of the specimen 13. A positioning plate is provided on the side of the fixed chuck 12 near the movable chuck 11. The positioning plate is located on the rear side of the fixed chuck 12, and a positioning pin is threadedly connected to the positioning plate. The moving direction of the positioning pin is perpendicular to the moving direction of the movable chuck 11. The thickness of the positioning plate in the clamping direction of the fixed chuck 12 and the movable chuck 11 is less than the thickness of the specimen 13. The positioning pin is used to position the specimen 13 in the front-back direction. A guide rod 8 is provided on the base 9 of the lower clamping assembly 3, and a vertical guide hole is provided on the base 9 of the upper clamping assembly 2. The guide rod 8 is slidably connected in the guide hole.

[0028] Multiple sets of first, second, and third washers with varying thicknesses can be provided. The first washer is installed on the side of the movable chuck 11 closest to the fixed chuck 12, i.e., the right side of the movable chuck 11. The second washer is installed on the side of the fixed chuck 12 closest to the movable chuck 11, i.e., the left side of the fixed chuck 12. The third washer is installed at the lower end of the base 9 of the upper clamping assembly 2.

[0029] The specific implementation process is as follows:

[0030] The specimen 13 is placed vertically between the fixed clamp 12 and the movable clamp 11. The positioning pin is adjusted according to the width of the specimen 13, with the rear side of the specimen 13 abutting against the positioning pin, so that the specimen 13 is on the axis of the testing machine in the front-back direction. Different thicknesses of the first and second shims can be selected according to the thickness of the specimen 13 to ensure that the specimen 13 is on the axis of the testing machine in the left-right direction. Different thicknesses of the third shim can be selected according to the length of the specimen 13 to ensure that the movable clamp 11 and the fixed clamp 12 can clamp the specimen 13 to the maximum extent. First, the drive component 10 of the lower clamping assembly 3 is activated, causing the drive component 10 to move the movable clamp 11 towards the fixed clamp 12 until the lower left and right sides of the specimen 13 are clamped. Then, the testing machine is started. The testing machine drives the pressure plate 6 and the top plate 7 downward through the connecting rod 4. The top plate 7 drives the base 9 of the upper clamping assembly 2 downward. The base 9 drives the movable clamp 11 and the fixed clamp 12 of the upper clamping assembly 2 downward until the top plate 7 abuts against the upper side of the specimen 13. Then, the driving component 10 of the upper clamping assembly 2 is started. The driving component 10 drives the movable clamp 11 to move towards the fixed clamp 12 until the specimen 13 is clamped.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing, characterized in that: It includes an upper connecting component (1), an upper clamping component (2), and a lower clamping component (3). The upper side of the upper connecting component (1) is connected to the testing machine, and the lower side of the upper connecting component (1) is connected to the upper clamping component (2). The upper connecting component (1) can drive the upper clamping component (2) to move closer to or further away from the lower clamping component (3). The upper clamping component (2) and the lower clamping component (3) face each other. Both the upper clamping component (2) and the lower clamping component (3) include a base (9) and a drive mechanism. The device comprises a moving part (10), a movable clamp (11), and a fixed clamp (12), the movable clamp (11) and the fixed clamp (12) being arranged along the left and right sides. The driving part (10) is mounted on the base (9), and the fixed clamp (12) is fixed on the base (9). The driving part (10) is used to drive the movable clamp (11) to move closer to or away from the fixed clamp (12). The fixed clamp (12) and the movable clamp (11) are used to clamp the two sides of the specimen (13).

2. The carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing according to claim 1, characterized in that: The fixed chuck (12) has a positioning plate on the side near the movable chuck (11). The positioning plate is threaded with a positioning pin. The moving direction of the positioning pin is perpendicular to the moving direction of the movable chuck (11). The thickness of the positioning plate in the clamping direction of the fixed chuck (12) and the movable chuck (11) is less than the thickness of the specimen (13). The positioning pin is used to position the specimen (13) in the front-back direction.

3. The carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing according to claim 1, characterized in that: The base (9) of the lower clamping assembly (3) is provided with a guide rod (8), and the base (9) of the upper clamping assembly (2) is provided with a vertical guide hole, and the guide rod (8) is slidably connected in the guide hole.

4. The carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing according to claim 1, characterized in that: The upper connecting assembly (1) includes a top plate (7) and a connecting structure. The top plate (7) is fixed on the base (9) of the upper clamping assembly (2). The connecting structure is used to connect the top plate (7) and the crossbeam of the testing machine. The bottom of the top plate (7) can abut against the top of the specimen (13).

5. The carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing according to claim 4, characterized in that: The connection structure includes a connecting rod (4) and a pressure plate (6). The lower side of the pressure plate (6) is connected to the upper side of the top plate (7). The upper side of the connecting rod (4) is connected to the crossbeam of the testing machine. A spherical pressure head (5) is provided on the lower side of the connecting rod (4). A groove matching the spherical pressure head (5) is provided on the upper side of the pressure plate (6).

6. The carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing according to claim 1, characterized in that: It also includes a first gasket, a second gasket and a third gasket, with multiple sets of the first gasket, the second gasket and the third gasket having different thicknesses; the first gasket is used to be installed on the side of the movable chuck (11) near the fixed chuck (12), the second gasket is used to be installed on the side of the fixed chuck (12) near the movable chuck (11), and the third gasket is used to be installed at the lower end of the base (9) of the upper clamping assembly (2).

7. The carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing according to claim 4, characterized in that: The connecting structure is located at the center of the top plate (7).

8. The carbon fiber pultrusion molding whole plate compression test fixture for carbon fiber material testing according to claim 1, characterized in that: The drive component (10) is a hydraulic cylinder, which is connected to a hydraulic pump, and a pressure gauge is connected to the hydraulic pump.

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