A simple device for holding Brazilian split in quick alignment

Abstract

The utility model discloses a simple and easy clamping device of brazilian splitting of quick centering, it includes the upper pressure head board and lower pressure -bearing board for clamping disc test piece, the lower surface of upper pressure head board is seted up with upper loading groove, the upper surface of lower pressure -bearing board is seted up with lower loading groove, the upper pressure head board and lower pressure -bearing board are connected through the orientation subassembly butt joint, and disc test piece is clamped between upper loading groove and lower loading groove, the utility model discloses disc test piece is clamped through upper loading groove and lower loading groove, and is connected upper pressure head board and lower pressure -bearing board through the orientation subassembly, can prevent the rolling of disc test piece at lower load, can ensure that it bears linear load, and the lateral deformation of test piece also will not produce any unfavorable effect, and simple installation, convenient operation, high reliability can effectively prevent the deflection of test piece in the process of installation and loading, thereby improve the accuracy of brazilian splitting test result.

Description

Technical Field

[0001] This utility model relates to the field of Brazilian splitting test technology, specifically to a simple clamping device for rapid centering of Brazilian splitting. Background Technology

[0002] The Brazilian splitting test, due to its simple equipment, ease of operation, and good reproducibility, is widely used in tunnel design, slope stability analysis, and material tensile performance evaluation. Despite limitations in specimen preparation quality and loading modes, its convenience makes it an indispensable fundamental testing method in geotechnical engineering and rock mechanics. The Brazilian splitting test not only plays a crucial role in theoretical and engineering applications but also promotes in-depth research and innovation in rock tensile strength testing methods.

[0003] The Brazilian splitting test uses compressive loading instead of direct tension, and its core principle is based on the stress transformation mechanism in materials mechanics. When the disc specimen is axially compressed on both sides, it will expand laterally (Poisson effect), generating the maximum tensile stress concentration at the center of the axial section, and eventually splitting failure occurs along the cross section perpendicular to the loading direction, thus indirectly determining the tensile strength of the material.

[0004] Domestic Brazilian splitting tests typically employ loading devices such as wire rods and flat indenters. However, disc specimens are prone to rolling due to lack of fixation or insufficient friction at the contact surface, leading to loading deviations. If rigid constraints are applied to fix the specimen, the deformation under stress will result in a large reaction force, affecting the accuracy of the test results. Therefore, designing a reasonable clamping device is crucial for determining the tensile strength parameters of rocks. Utility Model Content

[0005] To address the aforementioned problems in the prior art, this utility model provides a simple clamping device for Brazilian splitting tests that allows for rapid centering, thus solving the problem of unreliable clamping of specimens by existing clamping devices for Brazilian splitting tests.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A simple Brazilian splitting clamping device for rapid centering is provided, which includes an upper pressure plate and a lower pressure plate for clamping a disc specimen. The lower surface of the upper pressure plate has an upper loading groove, and the upper surface of the lower pressure plate has a lower loading groove. The upper pressure plate and the lower pressure plate are connected by a guide assembly to clamp the disc specimen between the upper loading groove and the lower loading groove.

[0007] This invention uses an upper and lower loading groove to clamp the disc specimen, and connects the upper pressure plate and lower bearing plate through a guide assembly. This prevents the disc specimen from rolling under low loads, ensuring that it bears a linear load and has no adverse effect on the lateral deformation of the specimen. It is simple to install, easy to operate, and highly reliable, effectively preventing specimen deflection during installation and loading, thereby improving the accuracy of the Brazilian splitting test results.

[0008] Furthermore, a force transmission section is provided in the middle of the upper surface of the upper pressure plate.

[0009] Furthermore, a first enlarged portion is provided on each side of the upper pressure plate.

[0010] Furthermore, a second enlarged portion is provided on each side of the lower bearing plate.

[0011] Furthermore, the guide assembly includes a guide rod and a guide groove that matches the guide rod; the guide rod is disposed on the second enlarged portions on both sides of the lower pressure plate; the guide groove is formed on the first enlarged portions on both sides of the upper pressure head plate.

[0012] Furthermore, the guide rod includes connected rectangular rods and arc-shaped rods.

[0013] Furthermore, positioning holes are provided on the lower surface of the lower pressure plate.

[0014] Furthermore, centering marks are provided on the upper pressure head plate and the lower pressure plate.

[0015] This utility model discloses a simple clamping device for quick centering of Brazilian splitters, the beneficial effects of which are: This invention clamps the disc specimen using upper and lower loading slots, and connects it to the upper pressure plate and lower bearing plate via a guide assembly. This ensures that the test load direction is vertically downward and prevents the upper pressure plate from deflecting or swaying. It also prevents the disc specimen from rolling under low loads, ensuring that it bears a linear load and has no adverse effect on the lateral deformation of the specimen. The invention is simple to install, easy to operate, and highly reliable, effectively preventing specimen deflection during installation and loading, thereby improving the accuracy of the Brazilian splitting test results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a simple Brazilian splitting clamping device for rapid centering according to the present invention.

[0017] Figure 2 This is a schematic diagram of the upper pressure plate of this utility model.

[0018] Figure 3 This is a schematic diagram of the lower pressure plate of this utility model.

[0019] Figure 4 This is a bottom view of the upper pressure plate of this utility model.

[0020] Figure 5 This is a top view of the lower pressure plate of this utility model.

[0021] Among them, 1. Upper pressure plate; 2. Lower pressure plate; 3. Positioning bolt; 4. Guide rod; 41. Rectangular rod; 42. Arc rod; 5. Centering mark; 6. Disc specimen; 7. Force transmission part; 8. First enlargement part; 9. Guide groove; 10. Upper loading groove; 11. Lower loading groove; 12. Second enlargement part; 14. Positioning hole. Detailed Implementation The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0022] Example 1 refer to Figures 1-5 This embodiment provides a simple clamping device for Brazilian splitting test specimens that allows for rapid centering. Its purpose is to solve the problem of unreliable clamping of specimens by existing clamping devices for Brazilian splitting tests. The specific structure of this embodiment will be described in detail below.

[0023] A simple Brazilian splitting clamping device for quick centering includes an upper pressure plate 1 and a lower pressure plate 2 for clamping a disc specimen 6.

[0024] Specifically, the upper pressure plate 1 has an upper loading groove 10 on its lower surface, and the lower pressure plate 2 has a lower loading groove 11 on its upper surface; the upper pressure plate 1 and the lower pressure plate 2 are connected by a guide assembly to clamp the disc specimen 6 between the upper loading groove 10 and the lower loading groove 11.

[0025] In this embodiment, the upper loading groove 10 and the lower loading groove 11 are arc-shaped grooves, using the arc surface recommended by the International Society for Rock Mechanics. The upper loading groove 10 and the lower loading groove 11 are arranged opposite each other and have the same shape and size. The upper and lower end faces of the upper pressure plate 1 and the lower pressure plate 2 are both planes.

[0026] By clamping the disc specimen 6 with the upper loading groove 10 and the lower loading groove 11, the disc specimen 6 can be prevented from rolling under low load, ensuring that it bears a linear load and will not have any adverse effect on the lateral deformation of the disc specimen 6.

[0027] Meanwhile, by connecting the upper pressure plate 1 and the lower pressure plate 2 through the guide assembly, it is ensured that the test load direction is vertically downward, and the situation of the upper pressure plate 1 deflecting and swaying is avoided.

[0028] This invention is simple to install, easy to operate, and highly reliable. It can effectively prevent specimen deflection during installation and loading, thereby improving the accuracy of Brazilian splitting test results.

[0029] Specifically, a force transmission part 7 is provided in the middle of the upper surface of the upper pressure plate 1.

[0030] In this embodiment, the force transmission part 7 is a force transmission rectangle disposed on the upper surface of the upper pressure head plate 1, which is used to transmit pressure to the upper pressure head plate 1.

[0031] Specifically, the upper pressure plate 1 has a first enlarged portion 8 on each side. The lower pressure plate 2 has a second enlarged portion 12 on each side.

[0032] In this embodiment, the first enlarged portion 8 and the second enlarged portion 12 are both enlarged trapezoidal bodies arranged opposite to each other on both sides of the upper pressure plate 1 and the lower pressure plate 2, so as to facilitate the connection between the upper pressure plate 1 and the lower pressure plate 2.

[0033] Optionally, the lower surface of the upper pressure plate 1 and the planar portion within the range of section II to section II-II on the upper surface of the lower pressure plate 2 fit together perfectly.

[0034] Specifically, the guide assembly includes a guide rod 4 and a guide groove 9 that fits into the guide rod 4; the guide rod 4 is disposed on the second enlarged portion 12 on both sides of the lower pressure plate 2; the guide groove 9 is opened on the first enlarged portion 8 on both sides of the upper pressure plate 1.

[0035] In this embodiment, the guide rod 4 is embedded in the guide groove 9 to provide limiting guidance for the upper pressure plate 1 and the lower pressure plate 2, thereby enabling quick docking of the upper pressure plate 1 and the lower pressure plate 2.

[0036] Specifically, the guide rod 4 includes a rectangular rod 41 and an arc-shaped rod 42 connected together.

[0037] In this embodiment, the guide rod 4 includes a rectangular rod 41 and an arc-shaped rod 42. The arc-shaped rod 42 is close to the guide groove 9. The connection between the rectangular rod 41 and the arc-shaped rod 42 ensures that the guide rod 4 has a certain rigidity in the vertical direction.

[0038] Preferably, the arc-shaped rod 42 is a semi-cylinder, and the semi-cylinder is tangent to the guide groove 9, which ensures that the test load direction is vertically downward and avoids the situation of the upper pressure plate deflecting and swaying. Optionally, after applying lubricating oil to the guide rod 4, the friction between the guide rod 4 and the guide groove 9 is reduced, so that the resistance of the guide rod 4 to the upper pressure plate 1 can be ignored.

[0039] Specifically, the lower surface of the lower pressure plate 2 is provided with positioning holes 14.

[0040] In this embodiment, a positioning bolt 3 is provided in the positioning hole 14. The positioning bolt 3 and the positioning hole 14 fit together, and the specifications of the positioning hole 14 are consistent with the specifications of the positioning hole at the top of the test loading jack. One end of the positioning bolt 3 is embedded in the positioning hole 14 on the lower surface of the lower bearing plate 2, and the other end of the positioning bolt 3 is embedded in the positioning hole at the top of the test loading jack, thereby ensuring that the device is always in the center of the top of the test loading jack during the test.

[0041] Specifically, centering marks 5 are provided on the upper pressure plate 1 and the lower pressure plate 2.

[0042] In this embodiment, the centering mark 5 is used to indicate the middle of the upper loading slot 10 and the lower loading slot 11. It can be an arrow mark to facilitate quick centering during the test.

[0043] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A simple clamping device for rapid centering of Brazilian splitting shards, characterized in that: Includes an upper pressure plate (1) and a lower pressure plate (2) for clamping the disc specimen (6); The upper pressure plate (1) has an upper loading groove (10) on its lower surface and the lower pressure plate (2) has a lower loading groove (11) on its upper surface. The upper pressure plate (1) and the lower pressure plate (2) are connected by a guide assembly to clamp the disc specimen (6) between the upper loading groove (10) and the lower loading groove (11).

2. The simple Brazilian splitting clamping device for rapid centering according to claim 1, characterized in that: A force transmission part (7) is provided in the middle of the upper surface of the upper pressure plate (1).

3. The simple Brazilian splitting clamping device for rapid centering according to claim 1, characterized in that: The upper pressure plate (1) is provided with a first enlarged part (8) on both sides.

4. The simple Brazilian splitting clamping device for rapid centering according to claim 3, characterized in that: The lower bearing plate (2) is provided with a second enlarged portion (12) on both sides.

5. The simple Brazilian splitting clamping device for rapid centering according to claim 4, characterized in that: The guide assembly includes a guide rod (4) and a guide groove (9) that fits into the guide rod (4); the guide rod (4) is disposed on the second enlarged portion (12) on both sides of the lower pressure plate (2); the guide groove (9) is opened on the first enlarged portion (8) on both sides of the upper pressure plate (1).

6. The simple Brazilian splitting clamping device for rapid centering according to claim 5, characterized in that: The guide rod (4) includes a connected rectangular rod (41) and an arc-shaped rod (42).

7. The simple Brazilian splitting clamping device for rapid centering according to claim 1, characterized in that: The lower surface of the lower pressure plate (2) is provided with positioning holes (14).

8. The simple Brazilian splitting clamping device for rapid centering according to claim 1, characterized in that: The upper pressure plate (1) and the lower pressure plate (2) are provided with centering marks (5).

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