A CT sample test fixture

Abstract

The utility model relates to a CT sample test fixture, which belongs to the technical field of fixtures, and includes an upper clamping assembly and a lower clamping assembly respectively connected to the CT sample, wherein the upper clamping assembly is located above the lower clamping assembly, and the upper clamping assembly includes an upper clamping piece and an upper spherical hinge, wherein the upper spherical hinge is detachably connected to the upper clamping piece, and the lower clamping assembly includes a lower clamping piece and a lower spherical hinge, wherein the lower spherical hinge is detachably connected to the lower clamping piece. The fixture is easy to operate, and testers can easily understand and use it. The fixture can be operated on different testing machines. The fixture has a simple structure, is easy to disassemble and clean, and has a long service life. The design of the ball hinge allows the operator to observe whether the two fixtures are aligned. When the two fixtures are not aligned, there will be a certain angle at the ball hinge, and the clamping position can be adjusted to reduce the angle of the ball hinge so that the upper and lower fixtures can be aligned.

Description

Technical Field

[0001] The utility model relates to a field, in particular to a CT sample test fixture. Background Art

[0002] In the prior art, for example, the patent with publication number CN110631902A discloses a fixture that is convenient for safely and quickly installing CT specimens. By adopting a fixture with a limited structure, the U-shaped fixture is first installed and fixed on the chuck assembly, and then the CT specimen is placed in the fixture and fixed by a pin. The operation is faster, more accurate, and easier, which greatly improves the safety of experimental operation and prevents the experimenter's fingers from being pinched. At the same time, it also provides a fixture for the safe and quick installation of CT specimens, making automated fracture toughness experiments possible.

[0003] The patent with the publication number CN109724873B discloses a CT specimen crack extension test fixture adapted to tension and compression loads, which can realize the application of stable tension and compression alternating loads to the CT specimens. The chuck is connected to the special CT specimen by pins; the inclined surface of the wedge block fits with the inclined groove of the chuck, and the upper surface of the wedge block fits with the bottom surface of the pressure block; the arc-shaped protrusion of the pressure block clamps the notch of the special CT specimen; the ferrule covers the chuck, and the fastening screw is connected to the ferrule by threading and supports the side of the wedge block; the thread at the upper end of the metal rod passes through the fastening nut and is connected to the threaded hole at the bottom of the chuck, and the thread at the lower end of the metal rod passes through the threaded hole in the center of the fastening disk and is connected to the fatigue machine fixture; the fastening nut fits with the bottom surface of the chuck; a circle of screws is installed on the fastening disk; the screws support the fatigue machine fixture. It can ensure that no gap is generated between the fixture and the specimen when the tension and compression alternating load is loaded, and the loading axis is kept unchanged. At the same time, the present invention is suitable for CT specimens of different sizes and is easy to install.

[0004] However, when installing the CT specimen, it is necessary to ensure that the position between the two chucks connected to the testing machine is just enough to install the CT specimen. The position requirement is high, and the installation of the CT specimen is inconvenient. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a CT sample test fixture, and the CT sample is easy to install.

[0006] In order to achieve the above-mentioned purpose of the invention, the utility model provides a CT specimen test fixture, including an upper clamping assembly and a lower clamping assembly respectively connected to the CT specimen, the upper clamping assembly is located above the lower clamping assembly, the upper clamping assembly includes an upper clamping piece and an upper spherical hinge, the upper spherical hinge is detachably connected to the upper clamping piece, the lower clamping assembly includes a lower clamping piece and a lower spherical hinge, the lower spherical hinge is detachably connected to the lower clamping piece.

[0007] Furthermore, the upper clamping assembly also includes an upper threaded connecting rod connected to the fatigue machine, and the upper threaded connecting rod is detachably connected to the upper spherical hinge.

[0008] Furthermore, the upper clamping member is threadedly connected to the upper spherical hinge, and the lower clamping member is threadedly connected to the lower spherical hinge.

[0009] Furthermore, the upper clamping piece is provided with an upper U-shaped groove matched with the CT sample, and the lower clamping piece is provided with a lower U-shaped groove matched with the CT sample.

[0010] Furthermore, the upper U-shaped groove is provided with an upper connecting hole for connecting the CT sample, and an upper positioning pin is provided in the upper connecting hole; the lower U-shaped groove is provided with a lower connecting hole for connecting the CT sample, and a lower positioning pin is provided in the lower connecting hole.

[0011] Furthermore, the lower clamping assembly also includes a lower threaded connecting rod connected to the fatigue machine, and the lower threaded connecting rod is detachably connected to the lower spherical hinge.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. Simple operation: This fixture is easy to operate, test personnel can easily understand and use it, and the specimen is easy to install.

[0014] 2. Strong adaptability: The fixture can be operated on different testing machines.

[0015] 3. Easy to maintain: This fixture has a simple structure, is easy to disassemble and clean, and has a long service life.

[0016] 4. Easy to align: The design of the ball hinge allows the operator to observe whether the two clamps are aligned. When the two clamps are not aligned, there will be a certain angle at the ball hinge. The clamping position can be adjusted to reduce the angle of the ball hinge so that the upper and lower clamps can be aligned. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0018] Figure 2 It is an enlarged cross-sectional structural schematic diagram of the upper clamping member of the utility model;

[0019] Figure 3 It is an enlarged cross-sectional structural schematic diagram of the lower clamping member of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the utility model. Obviously, the described embodiment is a part of the embodiment of the invention, not all of the embodiments. The embodiment of the utility model is described below in conjunction with the drawings.

[0021] refer to Figure 1 to Figure 3 The CT specimen test fixture comprises an upper clamping assembly and a lower clamping assembly respectively connected to the CT specimen, the upper clamping assembly is located above the lower clamping assembly, the upper clamping assembly comprises an upper clamping piece 1 and an upper spherical hinge 5, the upper spherical hinge 5 is detachably connected to the upper clamping piece 1, and the lower clamping assembly comprises a lower clamping piece 2 and a lower spherical hinge 6, the lower spherical hinge 6 is detachably connected to the lower clamping piece 2;

[0022] By setting the upper spherical hinge 5 and the lower spherical hinge 6, the upper clamping member 1 and the lower clamping member 2 can both rotate to a certain angle. When clamping the CT sample, the distance can be adjusted to a certain extent so as to clamp the CT sample, and the distance between the two does not need to be just enough to install the CT sample. Specifically, the distance between the installation positions of the upper clamping member 1 and the lower clamping member 2 can be shorter than the upper and lower installation positions of the CT sample. When installing, the upper clamping member 1 or the lower clamping member 2 can be rotated to a certain angle to be aligned with the CT sample for installation;

[0023] The upper clamping assembly also includes an upper threaded connecting rod 8 connected to the fatigue machine, and the upper threaded connecting rod 8 is detachably connected to the upper spherical hinge 5. The upper spherical hinge 5 includes an upper screw rod 7. The upper threaded connecting rod 8 is provided with an upper threaded hole that cooperates with the upper screw rod 7. The upper threaded hole is threadedly connected to the upper screw rod 7 to connect the upper threaded connecting rod 8 and the upper spherical hinge 5. In other implementations of this embodiment, a nut is fixedly provided at one end of the upper threaded connecting rod 8 connected to the upper spherical hinge 5, and the connection is completed with the upper screw rod 7 through the internal thread of the nut;

[0024] The upper clamping member 1 is threadedly connected to the upper spherical hinge 5, and the lower clamping member 2 is threadedly connected to the lower spherical hinge 6. The upper spherical hinge 5 is provided with an external threaded rod 11 for threaded connection, and the upper clamping member 1 is provided with an upper internal threaded hole 14 matched with the external threaded rod 11. The external threaded rod 11 is sleeved with a locking nut 12. Similarly, the lower clamping member 2 is connected to the lower spherical hinge 6.

[0025] The upper clamping member 1 is provided with an upper U-shaped groove 16 for matching with the CT specimen, and the lower clamping member 2 is provided with a lower U-shaped groove 17 for matching with the CT specimen; the upper U-shaped groove 16 is provided with an upper connecting hole 13 for connecting with the CT specimen, and the upper connecting hole 13 is provided with an upper positioning pin 3, and the lower U-shaped groove 17 is provided with a lower connecting hole 15 for connecting with the CT specimen, and the lower connecting hole 15 is provided with a lower positioning pin 4;

[0026] When clamping the CT sample, first adjust the relative position between the upper clamping member 1 and the lower clamping member 2, then insert the CT sample into the upper U-shaped groove 16, adjust the upper connecting hole 13 and the corresponding hole on the CT sample, and insert the upper positioning pin 3 for positioning. Similarly, insert the CT sample into the lower U-shaped groove 17, align the lower connecting hole 15 with the corresponding hole position on the CT sample, and insert the lower positioning pin 4 to complete the clamping and installation of the CT sample. If the hole positions cannot be aligned, the lower U-shaped groove 17 can be rotated to a certain angle through the lower spherical hinge 6 to facilitate the installation of the lower positioning pin 4 after alignment. Since the upper end of the CT sample is provided with an upper spherical hinge 5, it can also be rotated to a certain angle to facilitate installation after alignment.

[0027] The lower clamping assembly also includes a lower threaded connecting rod 10 connected to the fatigue machine, the lower threaded connecting rod 10 is detachably connected to the lower spherical hinge 6, and the lower spherical hinge 6 is provided with a lower screw rod for connecting the lower connecting threaded rod 10;

[0028] The fixture is easy to operate, test personnel can easily understand and use it, and the installation of the specimen is simpler;

[0029] The fixture can be operated on different testing machines;

[0030] The fixture has a simple structure, is easy to disassemble and clean, and has a long service life;

[0031] The design of the ball hinge allows the operator to observe whether the two clamps are aligned. When the two clamps are not aligned, there will be a certain angle at the ball hinge. The clamping position can be adjusted to reduce the angle of the ball hinge so that the upper and lower clamps can be aligned.

[0032] The technical solution of the present invention is described above in conjunction with specific implementation methods, but it should be noted that the above descriptions are only for explaining the solution of the present invention and cannot be interpreted in any way as a specific limitation on the scope of protection of the invention. Based on the explanation here, those skilled in the art can think of other specific implementation methods or equivalent replacements of the present invention without creative work, and they will all fall within the scope of protection of the present invention.

Claims

1. A CT sample test fixture, characterized in that: The invention comprises an upper clamping assembly and a lower clamping assembly respectively connected to the CT specimen, wherein the upper clamping assembly is located above the lower clamping assembly, the upper clamping assembly comprises an upper clamping piece and an upper spherical hinge, the upper spherical hinge is detachably connected to the upper clamping piece, and the lower clamping assembly comprises a lower clamping piece and a lower spherical hinge, the lower spherical hinge is detachably connected to the lower clamping piece.

2. The CT specimen test fixture according to claim 1, characterized in that: The upper clamping assembly also includes an upper threaded connecting rod connected to the fatigue machine, and the upper threaded connecting rod is detachably connected to the upper spherical hinge.

3. The CT sample test fixture according to claim 1, characterized in that: The upper clamping piece is threadedly connected to the upper spherical hinge, and the lower clamping piece is threadedly connected to the lower spherical hinge.

4. The CT sample test fixture according to claim 3, characterized in that: The upper clamping piece is provided with an upper U-shaped groove matched with the CT sample, and the lower clamping piece is provided with a lower U-shaped groove matched with the CT sample.

5. The CT sample test fixture according to claim 4, characterized in that: The upper U-shaped groove is provided with an upper connection hole for connecting the CT sample, and an upper positioning pin is matched in the upper connection hole. The lower U-shaped groove is provided with a lower connection hole for connecting the CT sample, and a lower positioning pin is matched in the lower connection hole.

6. The CT specimen test fixture according to claim 1, characterized in that: The lower clamping assembly also includes a lower threaded connecting rod connected to the fatigue machine, and the lower threaded connecting rod is detachably connected to the lower spherical hinge.

Images