Shearing test device
By designing clamping and pressure mechanisms, the problems of inaccurate positioning and unstable pressure control in traditional shear testing equipment are solved, enabling efficient and accurate shear testing and improving the reliability and economy of test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 广州珠江黄埔大桥建设有限公司
- Filing Date
- 2025-05-07
- Publication Date
- 2026-05-01
AI Technical Summary
Traditional shear testing equipment suffers from problems such as inaccurate positioning, insufficient clamping force, and cumbersome operation, making it difficult to accurately control and stably apply pressure, resulting in poor accuracy and repeatability of test results.
A clamping mechanism and a pressure mechanism are used. The arc-shaped clamping surfaces of the lower and upper clamping blocks are used for precise positioning. A coarse thread screw and a pressure device are used to simulate the pressure environment. A shearing cutter is set at the junction of the shearing specimen to perform the shearing operation.
It improves the accuracy and repeatability of shear tests, simplifies the operation process, reduces test costs, and enables better evaluation of the shear strength and deformation properties of materials.
Smart Images
Figure CN224189714U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of road administration experimental devices, specifically to a shear test device. Background Technology
[0002] With the rapid development of transportation, research on pavement materials has also progressed with the times. Currently, asphalt pavement is the main type of road surface in my country, and asphalt mixtures are a high-performance and widely used road paving material. Due to its excellent performance characteristics, such as good waterproofing, wear resistance, noise reduction, and ease of construction, asphalt mixtures have become the main paving material for highways and urban roads worldwide. For asphalt pavement performance evaluation, asphalt pavement exhibits good durability and comfort. Asphalt pavement performance is affected by many factors, such as the mix design of the asphalt mixture, environmental conditions (temperature, humidity, traffic load, etc.), and construction quality. The quality of the aggregates in the asphalt mixture, the adhesiveness of the asphalt, and the reasonable mix proportions all have a significant impact on pavement performance. The performance of asphalt mixtures is a very important area of research. The asphalt mixture shear test is an important tool for evaluating its mechanical properties. Through this test, we can better understand the response of asphalt mixtures under traffic loads, thus providing a scientific basis for highway design and construction. The shear test is a test method that applies shear force to asphalt mixtures by simulating traffic loads to evaluate their shear strength and deformation properties.
[0003] Traditional shear testing methods often rely on relatively simple and basic equipment to test the shear properties of materials. This traditional equipment typically consists of only a basic fixed platform (which can be considered a rudimentary base) for placing the shear specimen to be tested. To secure the specimen, simple bolts, clamps, or other fastening methods may be used, but these methods often suffer from inaccurate positioning, insufficient clamping force, or cumbersome operation. During shear testing, traditional methods usually use manual or simple mechanical devices to apply pressure, which is often difficult to control precisely and lacks stability and repeatability. Utility Model Content
[0004] This invention proposes a shear testing device, which allows for the analysis of the performance of asphalt mixtures under different conditions based on the shear test results. By measuring the sample's response, shear strength and deformation properties can be determined.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] A shear test apparatus includes a base, a clamping mechanism disposed on one side of the top surface of the base for clamping and positioning a shear test specimen, and a pressure mechanism disposed on the other side of the top surface of the base. The pressure mechanism is used to cooperate with the shear test specimen to simulate the effect of pressure. The apparatus also includes a shearing cutter disposed directly above the shear test specimen.
[0007] Furthermore, the clamping mechanism includes a lower clamping block fixed to one side of the top surface of the base, and an upper clamping block mounted directly above the lower clamping block by positioning bolts and positioning nuts. The lower clamping block and the upper clamping block on opposite sides form an upper and lower clamping and positioning mechanism for the shearing specimen.
[0008] Furthermore, the pressure mechanism includes a vertically mounted upright on the other side of the top surface of the base, a coarse threaded rod connected horizontally to the upright, a pressure device fixedly mounted at one end of the coarse threaded rod near the shear specimen, a torsion shear nut mounted at the other end of the coarse threaded rod, and pressure markings mounted on the coarse threaded rod along its length.
[0009] Furthermore, the upper clamping block has an integrally formed extension on its side, and the shearing tool is disposed on the extension.
[0010] Furthermore, the shearing specimen includes an integral lower shearing specimen and an upper shearing specimen, and the shearing tool is positioned directly above the junction of the lower shearing specimen and the upper shearing specimen.
[0011] Furthermore, the lower clamping block and the upper clamping block have an arc-shaped clamping surface on their opposite sides that resembles the shape of the shearing specimen.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] This invention achieves efficient and accurate testing of shear specimens by integrating a base, clamping mechanism, pressure mechanism, and shearing fixture. The clamping mechanism uses the arc-shaped clamping surfaces of the lower and upper clamping blocks to clamp and position the specimen. The pressure mechanism simulates the required pressure environment using a coarse-threaded screw and a pressure regulator. The shearing fixture is precisely positioned directly above the specimen's interface to perform the shearing operation. This device not only improves the accuracy and repeatability of the test but also effectively simplifies the operation process and reduces testing costs, making it significant for evaluating the shear strength and deformation properties of materials. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the clamping mechanism of this utility model. Detailed Implementation
[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0020] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0021] like Figure 1-2 As shown, a shear test apparatus includes a base 1, a clamping mechanism disposed on one side of the top surface of the base 1 for clamping and positioning a shear test specimen, and a pressure mechanism disposed on the other side of the top surface of the base 1. The pressure mechanism is used to cooperate with the shear test specimen to simulate the effect of pressure. The apparatus also includes a shearing cutter 9 disposed directly above the shear test specimen.
[0022] Specifically, as shown in the figure, the clamping mechanism includes a lower clamping block 2 fixed to one side of the top surface of the base 1, and an upper clamping block 3 mounted directly above the lower clamping block 2 by positioning bolts 4 and positioning nuts 5. The lower clamping block 2 and the upper clamping block 3 on opposite sides form an upper and lower clamping and positioning mechanism for the shearing specimen.
[0023] Specifically, as shown in the figure, the pressure mechanism includes a vertical rod 10 that is set on the other side of the top surface of the base 1. A coarse threaded screw 11 is horizontally threaded onto the rod 10. A pressure device 12 is fixedly installed at one end of the coarse threaded screw 11 near the shear specimen. A torsion shear nut 13 is installed at the other end of the coarse threaded screw 11. A pressure mark 14 is installed on the coarse threaded screw 11 along its length.
[0024] Specifically, as shown in the figure, the upper clamping block 3 has an extension 8 integrally formed on its side, and the shearing cutter 9 is disposed on the extension 8.
[0025] Specifically, as shown in the figure, the shearing specimen includes an integral lower shearing specimen 6 and an upper shearing specimen 7, and the shearing cutter 9 is located directly above the junction of the lower shearing specimen 6 and the upper shearing specimen 7.
[0026] Specifically, as shown in the figure, the lower clamping block 2 and the upper clamping block 3 have an arc-shaped clamping surface 15 on their opposite sides, which is similar to the shape of the shearing specimen.
[0027] Specifically, the specific implementation principle of this utility model is as follows:
[0028] First, fix the base 1 to the test bench surface, ensuring stability. Next, install a clamping mechanism on one side of the base 1, consisting of a lower clamping block 2 and an upper clamping block 3. The lower clamping block 2 is fixed to the base 1, while the upper clamping block 3 is positioned directly above the lower clamping block 2 via positioning bolts 4 and positioning nuts 5. At this point, the opposite sides of the lower clamping block 2 and the upper clamping block 3 form an arc-shaped clamping surface 15, used to match and clamp the shape of the sheared specimen. On the other side of the base 1, install a pressure mechanism, including a vertical rod 10, a coarse-threaded screw 11, a pressure device 12, and a torque shear nut 13. The coarse-threaded screw 11 has horizontal threads on the vertical rod 10, and its left and right positions are adjustable via a threaded connection. The pressure device 12 is fixed to the end of the coarse-threaded screw 11 near the sheared specimen to apply pressure. The shearing cutter 9 is mounted on the extension 8, which is part of the upper clamping block 3, ensuring that the shearing cutter 9 is accurately positioned directly above the sheared specimen. Prepare shear specimens, including an integral lower shear specimen 6 and an upper shear specimen 7. These two specimens are connected before the test, but during the test preparation stage, they will be placed in a clamping mechanism for separation during the test.
[0029] Place the lower shear specimen 6 on the arc-shaped clamping surface 15 of the lower clamping block 2, ensuring it remains stable. At this time, place the upper shear specimen 7 below the shearing tool, and adjust the position of the upper clamping block 3 so that its arc-shaped clamping surface 15 is in close contact with the upper shear specimen 7. Clamp the upper clamping block 3 and the lower clamping block 2 by tightening the positioning bolts 4 and 5, thereby fixing the shear specimen. According to the test requirements, adjust the position of the coarse thread screw 11 by rotating the torsion shear nut 13, thereby adjusting the distance between the pressure device 12 and the shear specimen. Simultaneously, observe the pressure markings 14 on the coarse thread screw 11 to ensure the pressure is adjusted to the required level.
[0030] After the pressure mechanism is adjusted, the test equipment is started, applying a constant pressure to the shear specimen using pressure regulator 12. Simultaneously, the shearing cutter 9 performs a shearing operation on the specimen under constant pressure. Since the shearing cutter 9 is located directly above the junction of the lower shear specimen 6 and the upper shear specimen 7, it effectively separates the two specimens. During the test, shear force data and the deformation of the shear specimen are recorded. These data will be used to evaluate the shear strength and deformation properties of the shear specimen.
[0031] The test ends when the shear specimen is completely separated. At this point, turn off the testing equipment and disconnect the power. Collect and record all relevant test data, including shear force, deformation, and test time. Analyze and process the test data to evaluate whether the shear strength and deformation properties of the shear specimen meet the expected requirements.
[0032] This invention achieves efficient and accurate testing of shear specimens by integrating a base, clamping mechanism, pressure mechanism, and shearing fixture. The clamping mechanism uses the arc-shaped clamping surfaces of the lower and upper clamping blocks to clamp and position the specimen. The pressure mechanism simulates the required pressure environment using a coarse-threaded screw and a pressure regulator. The shearing fixture is precisely positioned directly above the specimen's interface to perform the shearing operation. This device not only improves the accuracy and repeatability of the test but also effectively simplifies the operation process and reduces testing costs, making it significant for evaluating the shear strength and deformation properties of materials.
[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A shear testing apparatus, characterized in that, The device includes a base, a clamping mechanism disposed on one side of the top surface of the base for clamping and positioning a shearing specimen, and a pressure mechanism disposed on the other side of the top surface of the base. The pressure mechanism is used to cooperate with the shearing specimen to simulate the effect of pressure. The device also includes a shearing cutter disposed directly above the shearing specimen.
2. A shear test apparatus according to claim 1, wherein The clamping mechanism includes a lower clamping block fixed to one side of the top surface of the base, and an upper clamping block mounted directly above the lower clamping block by positioning bolts and positioning nuts. The lower clamping block and the upper clamping block on opposite sides form an upper and lower clamping and positioning mechanism for the shearing specimen.
3. The shear testing apparatus according to claim 2, characterized in that, The pressure mechanism includes a vertically mounted pole on the other side of the top surface of the base. A coarse threaded rod is horizontally threaded onto the pole. A pressure device is fixedly mounted on one end of the coarse threaded rod near the shear specimen. A torsion shear nut is mounted on the other end of the coarse threaded rod. Pressure markings are provided on the coarse threaded rod along its length.
4. A shear test apparatus according to claim 3, wherein The upper clamping block has an integrally formed extension on its side, and the shearing tool is disposed on the extension.
5. A shear test apparatus according to claim 4, wherein The shearing specimen includes an integral lower shearing specimen and an upper shearing specimen, and the shearing tool is located directly above the junction of the lower shearing specimen and the upper shearing specimen.
6. A shear test apparatus according to claim 5, wherein The lower clamping block and the upper clamping block have an arc-shaped clamping surface on their opposite sides that resembles the shape of the shearing specimen.