Centering clamping device and shearing force test equipment

Abstract

The utility model belongs to the technical field of clamping devices, and discloses a centering clamping device and shearing force test equipment. The centering and clamping device comprises a base, a centering assembly and an elastic piece, the centering assembly comprises a first connecting piece, a second connecting piece, a third connecting piece and a clamping piece, the third connecting piece is rotationally connected to the base, and the third connecting piece rotates to enable the first connecting piece and the second connecting piece to be in linkage so as to move by the same distance in the face-to-face or back-to-back mode; the elastic piece can enable the two clamping pieces to be close to each other so as to clamp the sample. The centering clamping device provided by the utility model can measure a plurality of groups of samples with different sizes, does not need manual centering of the samples, and improves the measurement efficiency and the measurement accuracy. The shearing force test equipment comprises the positioning surface, the loading mechanism and the centering and clamping device, and when the shearing force test equipment is used, the centering and clamping device is arranged on the positioning surface, so that the operation is simple, and the interlayer shearing force measurement efficiency of a sample is improved.

Description

A centering clamping device and shear force testing equipment Technical Field

[0001] This utility model relates to the field of clamping device technology, and in particular to a centering clamping device and a shear force testing device. Background Technology

[0002] Interlaminar shear testing of composite materials is a widely used test in the aircraft industry for process development and verification, used to evaluate the interfacial properties of composite materials. Currently, the standard ASTM D 2344 adopted by various aircraft models requires that the specimen be placed in the center to reduce measurement error. In existing technology, the interlaminar shear force of composite materials is measured by clamping the composite material with a clamping device and then measuring the shear force using a shear force measuring device.

[0003] However, existing clamping devices lack centering functionality, or those with centering functionality have complex structures that cannot be installed on shear force measuring equipment. Because shear force measuring equipment lacks centering functionality, when measuring the interlayer shear force performance of multiple sets of specimens of different sizes, manual centering of the specimens is required. This results in long testing times, low testing efficiency, and human error due to manual specimen centering, affecting the accuracy of the test results. Summary of the Invention

[0004] The purpose of this invention is to provide a centering clamping device to solve the problems of low measurement efficiency and poor measurement accuracy caused by the lack of centering function in shear force testing equipment.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A centering clamping device, comprising:

[0007] Base;

[0008] The centering assembly includes a first connector, a second connector, a third connector, and a clamping member. The first connector and the second connector are disposed opposite to each other on the base and are movably connected to the base. The third connector is rotatably connected to the base. The first connector and the second connector are symmetrically movably connected to both ends of the third connector. The rotation of the third connector allows the first connector and the second connector to move in tandem or backward by an equal distance. Each of the first connector and the second connector is connected to a clamping member at one of their closest points.

[0009] An elastic element, one end of which is connected to or abuts against the base, and the other end of which is connected to or abuts against the centering assembly, is capable of pushing the two clamping members closer together to clamp the sample.

[0010] In the above-mentioned centering clamping device, the third connecting member is plate-shaped, and a limiting groove is opened at each end of the third connecting member. The two limiting grooves are symmetrical about the center of the third connecting member. The first connecting member is slidably connected in one limiting groove, and the second connecting member is slidably connected in the other limiting groove.

[0011] The above-mentioned centering clamping device includes a centering component that further includes a rotating shaft, a rotating hole at the center of the third connector, and a positioning hole at the base. The rotating shaft passes through the rotating hole and the positioning hole in sequence, so that the third connector rotates around the rotating shaft.

[0012] The above-mentioned centering clamping device further includes a fourth connector, which is slidably connected to the base and parallel to the second connector. The end of the second connector away from the clamping member is movably connected to one end of the third connector, and the other end of the third connector is movably connected to one end of the fourth connector. The other end of the fourth connector is detachably and fixedly connected to the end of the first connector away from the clamping member.

[0013] The aforementioned centering clamping device includes a base comprising two first support members spaced apart, one of which is slidably connected to the first connecting member, and the other of which is slidably connected to the second connecting member, and the two clamping members are slidable between the two first support members.

[0014] In the aforementioned centering clamping device, the base includes two second support members spaced apart, each second support member having a limiting hole, and the fourth connector is slidably inserted through the limiting holes of the two second support members in sequence.

[0015] In the above-mentioned centering clamping device, the elastic element is a spring, which is sleeved on the first connecting member and / or the second connecting member, and the two ends of the elastic element can respectively abut against the base and the clamping member.

[0016] In the above-mentioned centering clamping device, the clamping member includes a pushing part, which is an arc surface. After the two clamping members are aligned, the sample can push against the pushing part to make the two clamping members move in opposite directions.

[0017] The above-mentioned centering clamping device further includes a clamping part, which is a plane. The clamping part is connected to the pushing part and is located below the pushing part. The clamping part can clamp the sample.

[0018] A shear force testing device includes a positioning surface, a loading mechanism, and the aforementioned centering clamping device. The base is positioned around the positioning surface such that the centering position of the centering clamping device coincides with the detection position of the shear force testing device. The loading mechanism applies force to the specimen clamped by the centering component to test the mechanical properties of the specimen.

[0019] The beneficial effects of this utility model are:

[0020] The centering clamping device provided by this utility model includes a base, a centering assembly, and an elastic element. The base supports the centering assembly and the elastic element. The centering assembly includes a first connecting member, a second connecting member, and a third connecting member connected to the base. In use, the two clamping members are pushed to move in opposite directions, and the sample is placed between the two clamping members. The elastic element applies force to the centering assembly, causing the two clamping members to move closer together to clamp the sample. The first and second connecting members are movably connected to the two ends of the third connecting member, respectively. The rotation of the third connecting member ensures that the first and second connecting members move in tandem, with equal distances in either direction or opposite directions. Therefore, the two clamping members can clamp the sample at the test position of the shear force testing equipment, reducing measurement errors and improving the accuracy of interlaminar shear force measurement results. By repeating the above operation, multiple sets of samples of different sizes can be measured without manual sample centering, improving measurement efficiency.

[0021] The shear force testing equipment provided by this utility model allows the base to be placed around the positioning surface during use, so that the centering position of the centering clamping device coincides with the detection position of the shear force testing equipment. This simplifies operation and improves the efficiency of interlaminar shear force measurement of the sample. Attached Figure Description

[0022] Figure 1 is a structural schematic diagram of the shear force testing device provided in an embodiment of this utility model;

[0023] Figure 2 is a schematic diagram of the centering clamping device provided in an embodiment of the present invention;

[0024] Figure 3 is a structural schematic diagram of the base provided in an embodiment of the present utility model;

[0025] Figure 4 is a structural schematic diagram of the first connector provided in an embodiment of the present utility model;

[0026] Figure 5 is a structural schematic diagram of the third connector provided in an embodiment of the present utility model;

[0027] Figure 6 is a structural schematic diagram of the fourth connector provided in an embodiment of the present utility model;

[0028] Figure 7 is a structural schematic diagram of the clamping member provided in an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Base; 11. First support member; 111. Guide hole; 12. Second support member; 121. Limiting hole; 13. Support arm; 14. Connecting arm; 15. Positioning hole;

[0031] 2. Centering component; 21. First connector; 211. First sliding part; 212. First connecting part; 22. Second connector; 221. First protrusion; 23. Third connector; 231. Limiting groove; 232. Rotating hole; 24. Clamping member; 241. Pushing part; 242. Clamping part; 25. Fourth connector; 251. Second sliding part; 252. Second connecting part; 253. Second protrusion;

[0032] 3. Elastic components;

[0033] 4. Rotating shaft;

[0034] 5. Shear force testing equipment; 51. Positioning surface;

[0035] 100. Sample. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or 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.

[0038] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] The present invention provides a centering clamping device that can be applied to shear force testing equipment to solve the problems of low measurement efficiency and poor measurement accuracy in interlaminar shear tests of composite materials due to the lack of centering function in shear force testing equipment.

[0041] As shown in Figures 1 to 5, the centering clamping device includes a base 1, a centering assembly 2, and an elastic element 3. The centering assembly 2 includes a first connecting member 21, a second connecting member 22, a third connecting member 23, and a clamping member 24. The first connecting member 21 and the second connecting member 22 are disposed opposite to each other on the base 1 and are movably connected to the base 1. The third connecting member 23 is rotatably connected to the base 1. The first connecting member 21 and the second connecting member 22 can be symmetrically and movably connected to the two ends of the third connecting member 23. The rotation of the third connecting member 23 allows the first connecting member 21 and the second connecting member 22 to move in tandem or backward by an equal distance. Each end of the first connecting member 21 and the second connecting member 22 that is close to each other is connected to a clamping member 24. One end of the elastic element 3 is connected to or abuts against the base 1, and the other end is connected to or abuts against the centering assembly 2. The elastic element 3 can push the two clamping members 24 closer to each other to clamp the sample 100.

[0042] The centering clamping device provided by this utility model includes a base 1, a centering component 2, and an elastic element 3. The base 1 supports the centering component 2 and the elastic element 3. The centering component 2 includes a first connecting member 21, a second connecting member 22, and a third connecting member 23 connected to the base 1. In use, the two clamping members 24 are pushed to move in opposite directions, and the sample 100 is placed between the two clamping members 24. The elastic element 3 applies force to the centering component 2, causing the two clamping members 24 to move closer together to clamp the sample 100. The first connecting member 21 and the second connecting member 22 are movably connected to the two ends of the third connecting member 23, respectively. The rotation of the third connecting member 23 ensures that the first connecting member 21 and the second connecting member 22 move equally in opposite directions. Therefore, the two clamping members 24 can clamp the sample 100 at the test position of the shear force testing equipment 5, reducing measurement errors and improving the accuracy of interlaminar shear force measurement results. By repeating the above operation, multiple sets of samples 100 of different sizes can be measured without manual centering of the sample 100, thus improving measurement efficiency.

[0043] The base 1 is used to connect the shear force testing equipment 5. The base 1 can be snapped onto the shear force testing equipment 5, or it can be connected to the shear force testing equipment 5 by bolts. This embodiment does not specifically limit the shape of the base 1. Exemplarily, the base 1 is fixed to the shear force testing equipment 5 by bolts. The base 1 includes a support arm 13 and a connecting arm 14 connected in sequence. The two support arms 13 and the connecting arm 14 form a semi-enclosed structure. The two support arms 13 are arranged around the positioning surface 51 of the shear force testing equipment 5 and are fixed by bolts (not shown in the figure).

[0044] In this embodiment, referring to Figure 3, the connecting arm 14 is provided with a notch, which can reduce its own weight, reduce stress concentration, and improve the service life of the base 1.

[0045] The third connecting member 23 can be plate-shaped or block-shaped. For example, referring to Figures 2 and 5, the third connecting member 23 is plate-shaped, with a limiting groove 231 at each end. The two limiting grooves 231 are symmetrical about the center of the third connecting member 23. In other embodiments, a first connecting member 21 is slidably connected within one limiting groove 231, and a second connecting member 22 is slidably connected within the other limiting groove 231. During the rotation of the third connecting member 23, the first connecting member 21 and the second connecting member 22 can slide or rotate within the limiting grooves 231, avoiding interference and improving the smoothness of movement.

[0046] Optionally, the first connecting member 21 is a U-shaped rod, and the second connecting member 22 is a straight rod. One end of the first connecting member 21 is fixedly connected to the clamping member 24, and the other end is movably connected to one of the limiting grooves 231 of the third connecting member 23. One end of the second connecting member 22 is fixedly connected to the clamping member 24, and the other end is movably connected to the other limiting groove 231 of the third connecting member 23. Both the first connecting member 21 and the second connecting member 22 are inserted through the base 1. When the third connecting member 23 rotates, it ensures that the ends of the first connecting member 21 and the second connecting member 22 that are fixedly connected to the clamping member 24 move collinearly and will not deviate.

[0047] Optionally, the first connector 21 and the second connector 22 can be plate-shaped, or partially plate-shaped and partially rod-shaped. The specific shape needs to be designed according to the actual situation.

[0048] For example, referring to Figures 2 and 3, the base 1 includes two first support members 11 spaced apart. One first support member 11 is slidably connected to a first connector 21, and the other first support member 11 is slidably connected to a second connector 22. Two clamping members 24 are slidable between the two first support members 11. The two first support members 11 have a limiting effect on the clamping members 24, preventing the first connector 21 and / or the second connector 22 from sliding off the first support member 11.

[0049] Specifically, referring to Figure 3, the first support member 11 has guide holes 111, and a first connector 21 and a second connector 22 are respectively inserted into the two guide holes 111. The dimensions of the guide holes 111, the first connector 21, and the second connector 22 correspond one-to-one, ensuring that the first connector 21 and the second connector 22 can slide within the guide holes 111. The diameter of the guide holes 111 is smaller than the size of the clamping member 24 to prevent the clamping member 24 from sliding out of the guide holes 111.

[0050] The two guide holes 111 are aligned along the movement direction of the clamping member 24. The guide holes 111 restrict the radial movement of the first connecting member 21 and the second connecting member 22, ensuring that the movement directions of the first connecting member 21 and the second connecting member 22 are collinear. This allows the two clamping members 24 to be aligned and clamped on both sides of the sample 100, reducing the influence of the shear force applied to the sample 100 by the two clamping members 24 on the measurement results and improving the accuracy of the test.

[0051] The third connector 23 can rotate around the base 1 using a shaft-hole fit. For example, referring to Figures 1, 3, and 5, the centering assembly 2 also includes a rotating shaft 4. A rotating hole 232 is provided at the center of the third connector 23, and a positioning hole 15 is provided in the base 1. The rotating shaft 4 passes through the rotating hole 232 and the positioning hole 15 in sequence, allowing the third connector 23 to rotate around the rotating shaft 4. The shaft-hole fit is simple and easy to process and assemble.

[0052] It is understandable that, since the center of the third connector 23 has a rotating hole 232 (see Figure 1), when the third connector 23 rotates counterclockwise around the rotating shaft 4, both ends of the third connector 23 will rotate counterclockwise by the same angle. Since the distance between the limiting groove 231 at both ends of the third connector 23 and the center of the rotating hole 232 is equal, the two ends of the third connector 23 move equal distances and move in opposite directions, which enables the first connector 21 and the second connector 22 to move equal distances in opposite directions, ensuring the alignment accuracy of the alignment component 2.

[0053] In other embodiments, the third connector 23 and the base 1, one of which has a rotating hole 232 and the other has a rotating shaft 4, the rotating shaft 4 and the rotating hole 232 cooperate to make the third connector 23 rotate around the base 1.

[0054] In other embodiments, the rotating hole 232 may not be located at the center of the third connector 23. As long as the two limiting grooves 231 are symmetrically arranged relative to the rotating hole 232, the first connector 21 and the second connector 22 can move an equal distance towards or away from each other during the rotation of the third connector 23.

[0055] In this embodiment, the centering assembly 2 further includes a fourth connector 25, which is slidably connected to the base 1 and parallel to the second connector 22. The end of the second connector 22 away from the clamping member 24 is movably connected to one end of the third connector 23, and the other end of the third connector 23 is movably connected to one end of the fourth connector 25. The other end of the fourth connector 25 is detachably and fixedly connected to the end of the first connector 21 away from the clamping member 24. When the centering assembly 2 is damaged, the damaged component can be replaced individually, reducing maintenance costs.

[0056] The first connecting member 21 is slidably connected to the base 1. Specifically, the first connecting member 21 includes a first sliding part 211 and a first connecting part 212. The first sliding part 211 passes through the guide hole 111 of the first support member 11. The first connecting part 212 of the first connecting member 21 and the second connecting part 252 of the fourth connecting member 25 have through holes for passing bolts to fix the first connecting member 21 and the fourth connecting member 25. Bolt connection is convenient and firm, avoiding misalignment of the first connecting member 21 and the fourth connecting member 25 and improving alignment accuracy.

[0057] For example, the first sliding portion 211 and the first connecting portion 212 are arranged at an angle, such that the fourth connecting member 25 is parallel to the movement direction of the first connecting member 21, thereby improving movement stability. The included angle between the first sliding portion 211 and the first connecting portion 212 can be 60°-120°, such as 60°, 75°, 90°, 105°, or 120°. Preferably, the included angle between the first sliding portion 211 and the first connecting portion 212 is 90°, which facilitates manufacturing.

[0058] In other embodiments, the first connector 21 may also be a straight rod that passes through the guide hole 111. The fourth connector 25 has two parts arranged at an angle, one part of which passes through the limiting hole 121 and the other part is detachably and fixedly connected to the first connector 21.

[0059] In this embodiment, referring to Figures 3 and 5, the second connector 22 has a first protrusion 221 at the end near the third connector 23, and the fourth connector 25 has a second protrusion 253 at the end near the third connector 23. The first protrusion 221 and the second protrusion 253 can be inserted into the limiting grooves 231 at both ends of the third connector 23 for easy connection. Both the first protrusion 221 and the second protrusion 253 are provided with pins to prevent them from sliding off the limiting grooves 231.

[0060] For example, referring to Figure 5, the limiting groove 231 is shaped like a racetrack. Specifically, the two ends of the limiting groove 231 are semi-circular, and the area between the two ends is rectangular. This allows the first protrusion 221 and the second protrusion 253 to slide more smoothly within the limiting groove 231, improving the stability of the centering clamping device's movement.

[0061] The first protrusion 221 can be fixedly connected to the second connector 22 or rotatably connected to the second connector 22. The second protrusion 253 can be fixedly connected to the fourth connector 25 or rotatably connected to the fourth connector 25. As long as the first protrusion 221 and the second protrusion 253 can move within the limiting groove 231, the second connector 22, the fourth connector 25 and the third connector 23 can move smoothly.

[0062] To improve the movement stability of the fourth connector 25, referring to Figures 1 and 3, the base 1 includes two second support members 12 spaced apart. Each second support member 12 has a limiting hole 121. The fourth connector 25 slides through the limiting holes 121 of the two second support members 12 in sequence. The limiting holes 121 provide a guiding function for the fourth connector 25.

[0063] This embodiment does not specifically limit the shape and size of the limiting hole 121. For example, the size of the limiting hole 121 corresponds to the size of the fourth connector 25, ensuring that the fourth connector 25 can slide within the limiting hole 121.

[0064] In this embodiment, referring to FIG2, the fourth connector 25 includes a second sliding portion 251 located in the middle and second connecting portions 252 located at both ends. The second sliding portion 251 is rod-shaped for easy processing, and the second connecting portion 252 is plate-shaped for easy drilling and connection to the first connector 21 and the third connector 23.

[0065] This embodiment does not specifically limit the connection method of the first connector 21, the third connector 23, and the fourth connector 25. For example, the first connector 21 and the fourth connector 25 can be connected by bolts, ensuring a secure connection, preventing loosening and misalignment, and improving alignment. Similarly, the third connector 31 and the fourth connector 25 can be connected by bolts, ensuring a secure connection, preventing loosening and misalignment, and improving alignment.

[0066] In other embodiments, the first connector 21 and the fourth connector 25 can be connected by a pin, and the third connector 31 and the fourth connector 25 can be connected by a pin, which is convenient for connection.

[0067] The elastic element 3 is used to push the two clamping elements 24 to move towards each other to clamp the sample 100. Preferably, the elastic element 3 is a spring. The elastic element 3 is sleeved on the first connecting element 21 and / or the second connecting element 22. The two ends of the elastic element 3 can respectively abut against the base 1 and the clamping element 24. The first connecting element 21 and / or the second connecting element 22 provide support for the elastic element 3.

[0068] Optionally, the first connector 21 is provided with an elastic element 3, which is sleeved between the first support 11 and the clamping element 24 near the first connector 21. The elastic element 3 pushes the clamping element 24 to move towards the second connector 22. Since the clamping element 24 and the first connector 21 are fixedly connected, the clamping element 24 drives the first connector 21 to move towards the second connector 22. The first connector 21 drives the fourth connector 25 to move towards the second connector 22. The fourth connector 25 drives the third connector 23 to rotate counterclockwise. The third connector 23 drives the second connector 22 to move towards the first connector 21, thereby bringing the two clamping elements 24 closer to each other to clamp the sample 100. The counterclockwise rotation direction can be seen in Figure 1.

[0069] Optionally, the second connector 22 is provided with an elastic element 3, which is disposed between the first support 11 and the clamping member 24 near the second connector 22. The elastic element 3 pushes the clamping member 24 to move towards the first connector 21. Since the clamping member 24 and the second connector 22 are fixedly connected, the clamping member 24 drives the second connector 22 to move towards the first connector 21. The second connector 22 drives the third connector 23 to rotate counterclockwise. The third connector 23 drives the fourth connector 25 to move towards the second connector 22. The fourth connector 25 drives the first connector 21 to move towards the second connector 22, thereby bringing the two clamping members 24 closer to each other to clamp the sample 100. The counterclockwise rotation direction can be seen in Figure 1.

[0070] Preferably, referring to Figure 2, both the first connecting member 21 and the second connecting member 22 are fitted with elastic elements 3. For ease of description, the elastic element 3 fitted on the first connecting member 21 is called the first elastic element, and the elastic element 3 fitted on the second connecting member 22 is called the second elastic element. The two ends of the first elastic element abut against the clamping member 24 and the first support member 11 connected to the first connecting member 21, respectively. The two ends of the second elastic element abut against the clamping member 24 and the first support member 11 connected to the second connecting member 22, respectively, facilitating assembly. The first and second elastic elements apply the same elastic force to the clamping member 24, making the movement of the centering clamping device smoother.

[0071] In other implementations, the first support member 11 and the clamping member 24 may have annular grooves for engaging the two ends of the elastic member 3 to improve stability.

[0072] The clamping member 24 is used to clamp the sample 100. In this embodiment, referring to Figure 2, the clamping member 24 includes a pushing part 241, which is an arc surface. After the two clamping members 24 are aligned, the sample 100 can push against the pushing part 241 to make the two clamping members 24 move in opposite directions, which facilitates the separation of the two clamping members 24.

[0073] Specifically, the clamping member 24 also includes a clamping portion 242, which is planar. The clamping portion 242 is connected to and located below the pushing portion 241. The clamping portion 242 can clamp the sample 100 more securely. Furthermore, a buffer layer can be provided on the surface of the clamping portion 242 to reduce the clamping force on the sample 100 and avoid damage to the sample 100. The buffer layer can be made of rubber, which is readily available.

[0074] In use, the two clamping members 24 are aligned, and one end of the sample 100 contacts one of the pushing parts 241, pushing the clamping member 24 to move. Since the rotation of the third connecting member 23 can cause the first connecting member 21 and the second connecting member 22 to move the same distance in opposite directions, after the sample 100 pushes one of the clamping members 24, the two clamping members 24 can move the same distance in opposite directions, ensuring the centering effect.

[0075] In the initial state, the third connector 23 is perpendicular to the second connector 22 and the fourth connector 25, with the first protrusion 221 and the second protrusion 253 located at the center of the two limiting grooves 231, respectively. For ease of description, the limiting groove 231 through which the first protrusion 221 passes is called the first limiting groove, and the limiting groove 231 through which the second protrusion 253 passes is called the second limiting groove. Referring to Figures 1 and 2, when the third connector 23 rotates clockwise, the first protrusion 221 can slide along the groove wall of the first limiting groove towards the rotation hole 232, and the second protrusion 253 can slide along the groove wall of the second limiting groove towards the rotation hole 232, ensuring that the movement directions of the second connector 22 and the fourth connector 25 are parallel, thus improving the stability of the movement.

[0076] Referring to Figure 1, this utility model also provides a shear force testing device 5, including a positioning surface 51, a loading mechanism and the above-mentioned centering clamping device. The base 1 can surround the positioning surface 51 so that the centering position of the centering clamping device coincides with the detection position of the shear force testing device 5. The loading mechanism can apply force to the sample 100 clamped by the centering component 2 to test the mechanical properties of the sample 100.

[0077] The shear force testing equipment provided by this utility model has a simple operation and improves the efficiency of interlayer shear force measurement of the sample 100 by installing the centering clamping device at the positioning surface 51 during use.

[0078] The interlaminar shear force test on specimen 100 mainly includes the following steps:

[0079] S1: The base 1 is placed around the shear force testing equipment 5 and fixed with existing bolts so that the detection position of the shear force testing equipment 5 is aligned with the centering position of the centering clamping device;

[0080] S2: Push the two clamping members 24 to move in opposite directions, and place the sample 100 between the two clamping members 24. The elastic member 3 pushes the two clamping members 24 closer to each other to clamp the sample 100 at the center position.

[0081] S3: Start the shear force testing equipment 5 to test the interlaminar shear force of the specimen 100;

[0082] S4: Replace with a sample 100 of a different size and repeat steps S1-S3.

[0083] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A centering clamping device, characterized in that, include: A base (1); a centering component (2), the centering component (2) comprising a first connector (21), a second connector (22), a third connector (23), and a clamping component (24). The first connector (21) and the second connector (22) are disposed opposite to each other on the base (1) and are both movably connected to the base (1). The third connector (23) is rotatably connected to the base (1). The first connector (21) and the second connector (22) are symmetrically movably connected to both ends of the third connector (23). The three connecting parts (23) rotate so that the first connecting part (21) and the second connecting part (22) can move in conjunction to move an equal distance towards or away from each other. Each of the first connecting part (21) and the second connecting part (22) is connected to a clamping part (24) at one end that is close to each other. An elastic part (3) is connected to or abuts against the base (1) at one end and to the centering assembly (2) at the other end. The elastic part (3) can push the two clamping parts (24) to move closer to each other to clamp the sample (100).

2. The centering clamping device according to claim 1, characterized in that, The third connector (23) is plate-shaped, and a limiting groove (231) is provided at each end of the third connector (23). The two limiting grooves (231) are symmetrical about the center of the third connector (23). The first connector (21) is slidably connected in one of the limiting grooves (231), and the second connector (22) is slidably connected in the other limiting groove (231).

3. The centering clamping device according to claim 2, characterized in that, The centering component (2) also includes a rotating shaft (4), a rotating hole (232) is provided at the center of the third connector (23), and a positioning hole (15) is provided on the base (1). The rotating shaft (4) passes through the rotating hole (232) and the positioning hole (15) in sequence, so that the third connector (23) rotates around the rotating shaft (4).

4. The centering clamping device according to claim 1, wherein the centering component (2) further comprises a fourth connector (25), the fourth connector (25) being slidably connected to the base (1) and parallel to the second connector (22), one end of the second connector (22) away from the clamping member (24) being movably connected to one end of the third connector (23), the other end of the third connector (23) being movably connected to one end of the fourth connector (25), and the other end of the fourth connector (25) being detachably and fixedly connected to the end of the first connector (21) away from the clamping member (24).

5. The centering clamping device according to claim 4, characterized in that, The base (1) includes two first support members (11) spaced apart, one of which is slidably connected to the first connector (21), and the other is slidably connected to the second connector (22). The two clamping members (24) are able to slide between the two first support members (11).

6. The centering clamping device according to claim 4, characterized in that, The base (1) includes two second support members (12) spaced apart. The second support members (12) have limit holes (121). The fourth connector (25) slides through the limit holes (121) of the two second support members (12) in sequence.

7. The centering clamping device according to claim 1, characterized in that, The elastic element (3) is a spring. The elastic element (3) is sleeved on the first connecting member (21) and / or the second connecting member (22). The two ends of the elastic element (3) can respectively abut against the base (1) and the clamping member (24).

8. The centering clamping device according to any one of claims 1-7, characterized in that, The clamping member (24) includes a pushing part (241), which is an arc surface. After the two clamping members (24) are aligned, the sample (100) can push against the pushing part (241) so that the two clamping members (24) move in opposite directions.

9. The centering clamping device according to claim 8, characterized in that, The clamping member (24) further includes a clamping part (242). The clamping member (24) is a plane. The clamping member (24) is connected to the pushing part (241) and located below the pushing part (241). The clamping member (24) can clamp the sample (100).

10. A shear force testing device, comprising a positioning surface (51), a loading mechanism, and a centering clamping device as described in any one of claims 1-9, characterized in that, The base (1) can be arranged around the positioning surface (51) so that the centering position of the centering clamping device coincides with the detection position of the shear force testing device (5). The loading mechanism can apply force to the sample (100) clamped by the centering component (2) to test the mechanical properties of the sample (100).

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